Battery management circuit | Electronics Forum (Circuits, Projects and Microcontrollers)

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It may not display this or other websites correctly.<br />You should upgrade or use an <a href="https://www.google.com/chrome/" target="_blank" rel="noopener">alternative browser</a>.</div> <div class="p-body-header"> <div class="p-title "> <h1 class="p-title-value">Battery management circuit</h1> </div> <div class="p-description"> <ul class="listInline listInline--bullet"> <li> <i class="fa--xf fal fa-user" aria-hidden="true" title="Thread starter"></i> <span class="u-srOnly">Thread starter</span> <a href="/members/maltais14.328081/" class="username u-concealed" dir="auto" data-user-id="328081" data-xf-init="member-tooltip">Maltais14</a> </li> <li> <i class="fa--xf fal fa-clock" aria-hidden="true" title="Start date"></i> <span class="u-srOnly">Start date</span> <a href="/threads/battery-management-circuit.166933/" class="u-concealed"><time class="u-dt" dir="auto" datetime="2024-11-22T15:45:36-0800" data-time="1732319136" data-date-string="Nov 22, 2024" data-time-string="3:45 PM" title="Nov 22, 2024 at 3:45 PM">Yesterday at 3:45 PM</time></a> </li> </ul> </div> </div> <div class="p-body-main p-body-main--withSidebar "> <div class="p-body-contentCol"></div> <div class="p-body-sidebarCol"></div> <div class="p-body-content"> <div class="p-body-pageContent"> <div class="block block--messages " data-xf-init="lightbox select-to-quote" data-message-selector=".js-post" data-lb-id="thread-166933"> <div class="block-outer"></div> <div class="block-outer js-threadStatusField"></div> <div class="block-container"> <div class="block-body"> <article class="message message--post js-post js-inlineModContainer " data-author="Maltais14" data-content="post-1457741" id="js-post-1457741" > <span class="u-anchorTarget" id="post-1457741"></span> <div class="message-inner"> <div class="message-cell message-cell--user"> <section class="message-user" > <div class="message-avatar "> <div class="message-avatar-wrapper"> <a href="/members/maltais14.328081/" class="avatar avatar--m avatar--default avatar--default--dynamic" data-user-id="328081" data-xf-init="member-tooltip" style="background-color: #e085c2; color: #8f246b"> <span class="avatar-u328081-m" role="img" aria-label="Maltais14">M</span> </a> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/maltais14.328081/" class="username " dir="auto" data-user-id="328081" data-xf-init="member-tooltip">Maltais14</a></h4> <h5 class="userTitle message-userTitle" dir="auto">New Member</h5> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/battery-management-circuit.166933/post-1457741" rel="nofollow" > <time class="u-dt" dir="auto" datetime="2024-11-22T15:45:36-0800" data-time="1732319136" data-date-string="Nov 22, 2024" data-time-string="3:45 PM" title="Nov 22, 2024 at 3:45 PM">Yesterday at 3:45 PM</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/battery-management-circuit.166933/post-1457741" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1457741/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/battery-management-circuit.166933/post-1457741" rel="nofollow"> #1 </a> </li> </ul> </header> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1457741" data-lb-caption-desc="Maltais14 · Nov 22, 2024 at 3:45 PM"> <article class="message-body js-selectToQuote"> <div > <div class="bbWrapper">Hey I am a newbie.<br /> Im tired of hard to find management systems so i wanna learn, so far i am re**rded.<br /> If anyone with free time could consult me a bit i would appreciate it a lot.<br /> i want a management system at least with low voltage cut off since i have no problem using specific chargers but charging circuit would also be nice and balancing.<br /> Battery is lifpo4 6 cells 3.2v 15a big ass cells.<br /> i want them for a 200w Bluetooth speaker. i guess i also need some kind of voltage regulator so i don't drop wattage when discharging.<br /> the amp is cheapest 200w with pops. sub and a full range and tweeter 2 passive rads.<br /> AI recommends me BQ7692000PW and it seems good but it needs i think a comparator but i am not sure since all diagrams say host or some IC.<br /> <br /> as much as i understand i need a voltage divider which i can make from resistors and then a voltage regulator also a competitor and a MosFet for switching. and then something for monitoring the cell voltage.<br /> I just wanna make sure i buy all the necessary parts and they can take the 15A.<br /> also a schematic would be nice<br /> i will add the ones i took a look at and didn't completely understand. <br /> Thanks in advance.<br /> I am sorry for duplicate thread others were for low current and 1 cell as much as i saw.<br /> <script class="js-extraPhrases" type="application/json"> { "lightbox_close": "Close", "lightbox_next": "Next", "lightbox_previous": "Previous", "lightbox_error": "The requested content cannot be loaded. Please try again later.", "lightbox_start_slideshow": "Start slideshow", "lightbox_stop_slideshow": "Stop slideshow", "lightbox_full_screen": "Full screen", "lightbox_thumbnails": "Thumbnails", "lightbox_download": "Download", "lightbox_share": "Share", "lightbox_zoom": "Zoom", "lightbox_new_window": "New window", "lightbox_toggle_sidebar": "Toggle sidebar" } </script> <div class="bbImageWrapper js-lbImage" title="8308.bq24753a_selection.png-2460x0.png" data-src="https://www.electro-tech-online.com/attachments/8308-bq24753a_selection-png-2460x0-png.147827/" data-lb-sidebar-href="" data-lb-caption-extra-html="" data-single-image="1"> <img src="https://www.electro-tech-online.com/attachments/8308-bq24753a_selection-png-2460x0-png.147827/" data-url="" class="bbImage" data-zoom-target="1" style="" alt="8308.bq24753a_selection.png-2460x0.png" title="8308.bq24753a_selection.png-2460x0.png" width="1124" height="713" loading="lazy" /> </div></div> </div> <div class="js-selectToQuoteEnd"> </div> </article> <section class="message-attachments"> <h4 class="block-textHeader">Attachments</h4> <ul class="attachmentList"> <li class="file file--linked"> <a class="u-anchorTarget" id="attachment-147828"></a> <a class="file-preview js-lbImage" data-lb-sidebar-href="" data-lb-caption-extra-html="" href="/attachments/0513-bq76920_selected-png-2460x0-png.147828/" target="_blank"> <img src="/data/attachments/136/136813-1f19694524602737afb777f205e0a6a2.jpg" alt="0513.bq76920_selected.png-2460x0.png" width="228" height="100" loading="lazy" /> </a> <div class="file-content"> <div class="file-info"> <span class="file-name" title="0513.bq76920_selected.png-2460x0.png">0513.bq76920_selected.png-2460x0.png</span> <div class="file-meta"> 107.4 KB · Views: 14 </div> </div> </div> </li> </ul> </section> </div> <div class="message-lastEdit"> Last edited: <time class="u-dt" dir="auto" datetime="2024-11-22T15:55:40-0800" data-time="1732319740" data-date-string="Nov 22, 2024" data-time-string="3:55 PM" title="Nov 22, 2024 at 3:55 PM">Yesterday at 3:55 PM</time> </div> </div> <footer class="message-footer"> <div class="reactionsBar js-reactionsList "> </div> <div class="js-historyTarget message-historyTarget toggleTarget" data-href="trigger-href"></div> </footer> </div> </div> </div> </article> </div> </div> </div> <div class="block block--messages" data-xf-init="" data-type="post" data-href="/inline-mod/" data-search-target="*"> <span class="u-anchorTarget" id="posts"></span> <div class="block-outer"><div class="block-outer-opposite"> <div class="tabs tabs--standalone tabs--standalone--small tabs--standalone--inline"> <a href="/threads/battery-management-circuit.166933/" class="tabs-tab is-active" rel="nofollow"> Sort by date </a> <a href="/threads/battery-management-circuit.166933/?order=vote_score" class="tabs-tab " rel="nofollow"> Sort by votes </a> </div> </div></div> <div class="block-container lbContainer" data-xf-init="lightbox select-to-quote" data-message-selector=".js-post" data-lb-id="thread-166933" data-lb-universal="0"> <div class="block-body js-replyNewMessageContainer"> <article class="message message--post js-post js-inlineModContainer " data-author="aliarifat794" data-content="post-1457768" id="js-post-1457768" itemscope itemtype="https://schema.org/Answer" itemid="https://www.electro-tech-online.com/posts/1457768/"> <meta itemprop="parentItem" itemscope itemid="https://www.electro-tech-online.com/threads/battery-management-circuit.166933/" /> <span class="u-anchorTarget" id="post-1457768"></span> <div class="message-inner"> <div class="message-cell message-cell--user"> <section class="message-user" itemprop="author" itemscope itemtype="https://schema.org/Person" itemid="https://www.electro-tech-online.com/members/aliarifat794.325293/"> <meta itemprop="url" content="https://www.electro-tech-online.com/members/aliarifat794.325293/" /> <div class="message-avatar "> <div class="message-avatar-wrapper"> <a href="/members/aliarifat794.325293/" class="avatar avatar--m avatar--default avatar--default--dynamic" data-user-id="325293" data-xf-init="member-tooltip" style="background-color: #85c2e0; color: #246b8f"> <span class="avatar-u325293-m" role="img" aria-label="aliarifat794">A</span> </a> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/aliarifat794.325293/" class="username " dir="auto" data-user-id="325293" data-xf-init="member-tooltip"><span itemprop="name">aliarifat794</span></a></h4> <h5 class="userTitle message-userTitle" dir="auto" itemprop="jobTitle">Active Member</h5> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/battery-management-circuit.166933/post-1457768" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-11-23T08:08:15-0800" data-time="1732378095" data-date-string="Nov 23, 2024" data-time-string="8:08 AM" title="Nov 23, 2024 at 8:08 AM" itemprop="datePublished">Today at 8:08 AM</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/battery-management-circuit.166933/post-1457768" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1457768/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/battery-management-circuit.166933/post-1457768" rel="nofollow"> #2 </a> </li> </ul> </header> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1457768" data-lb-caption-desc="aliarifat794 · Nov 23, 2024 at 8:08 AM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">I cannot see any balancing circuit in the schematic. Add a balancing circuit for the 6 cells, either using an external IC (e.g., BQ76920 or BQ76200) or discrete components. Your battery pack is a 6-cell LiFePO4 configuration (3.2V nominal per cell), meaning a total nominal voltage of 19.2V and a max charge voltage of ~21.6V. Check if the OVPSET (over-voltage protection setpoint) and SRSET (current limit) resistors are correctly calculated to support these values. If you want to see some more BMS circuits for more references, you can see one here: <a href="https://www.pcbway.com/project/shareproject/bq40z50_r2_BMS_4S_681f1491.html" target="_blank" class="link link--external" rel="nofollow ugc noopener">https://www.pcbway.com/project/shareproject/bq40z50_r2_BMS_4S_681f1491.html</a></div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="0" /> <meta itemprop="interactionType" content="https://schema.org/LikeAction" /> </div> <div class="reactionsBar js-reactionsList "> </div> <div class="js-historyTarget message-historyTarget toggleTarget" data-href="trigger-href"></div> </footer> </div> </div> <div class="message-cell message-cell--vote"> <div class="message-column"> <div class="contentVote js-contentVote " data-xf-init="content-vote" data-content-id="post-1457768"> <meta itemprop="upvoteCount" content="0" /> <a href="javascript:" class="contentVote-vote is-disabled contentVote-vote--up " data-vote="up"><span class="u-srOnly">Upvote</span></a> <span class="contentVote-score js-voteCount" data-score="0">0</span> <a href="javascript:" class="contentVote-vote is-disabled contentVote-vote--down " data-vote="down"><span class="u-srOnly">Downvote</span></a> </div> </div> </div> </div> </article> </div> </div> <div class="block-outer block-outer--after"> <div class="block-outer-opposite"> <a href="/login/" class="button--link button--wrap button" data-xf-click="overlay"><span class="button-text"> You must log in or register to reply here. </span></a> </div> </div> </div> <div class="inContentAd"><div id='div-gpt-eto_thread1'> <script> googletag.cmd.push(function() { googletag.display('div-gpt-eto_thread1'); 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Are you sure you want to submit this form?", attach: "Attach files", rich_text_box: "Rich text box", close: "Close", link_copied_to_clipboard: "Link copied to clipboard.", text_copied_to_clipboard: "Text copied to clipboard.", loading: "Loading…", you_have_exceeded_maximum_number_of_selectable_items: "You have exceeded the maximum number of selectable items.", processing: "Processing", 'processing...': "Processing…", showing_x_of_y_items: "Showing {count} of {total} items", showing_all_items: "Showing all items", no_items_to_display: "No items to display", number_button_up: "Increase", number_button_down: "Decrease", push_enable_notification_title: "Push notifications enabled successfully at Electronics Forum (Circuits, Projects and Microcontrollers)", push_enable_notification_body: "Thank you for enabling push notifications!", pull_down_to_refresh: "Pull down to refresh", release_to_refresh: "Release to refresh", refreshing: "Refreshing…" , "svStandardLib_time.day": "{count} day", "svStandardLib_time.days": "{count} days", "svStandardLib_time.hour": "{count} hour", "svStandardLib_time.hours": "{count} hours", "svStandardLib_time.minute": "{count} minutes", "svStandardLib_time.minutes": "{count} minutes", "svStandardLib_time.month": "{count} month", "svStandardLib_time.months": "{count} months", "svStandardLib_time.second": "{count} second", "svStandardLib_time.seconds": "{count} seconds", "svStandardLib_time.week": "time.week", "svStandardLib_time.weeks": "{count} weeks", "svStandardLib_time.year": "{count} year", "svStandardLib_time.years": "{count} years" }); </script> <form style="display:none" hidden="hidden"> <input type="text" name="_xfClientLoadTime" value="" id="_xfClientLoadTime" title="_xfClientLoadTime" tabindex="-1" /> </form>    <div id='div-gpt-eto_wallpaper'> <script> googletag.cmd.push(function() { googletag.display('div-gpt-eto_wallpaper'); }); </script> </div>  <script type="application/ld+json"> { "@context": "https://schema.org", "@type": "QAPage", "url": "https://www.electro-tech-online.com/threads/battery-management-circuit.166933/", "mainEntity": { "@type": "Question", "@id": "https://www.electro-tech-online.com/threads/battery-management-circuit.166933/", "name": "Battery management circuit", "datePublished": "2024-11-22T23:45:36+00:00", "dateModified": "2024-11-22T23:55:40+00:00", "url": "https://www.electro-tech-online.com/threads/battery-management-circuit.166933/", "image": "https://www.electro-tech-online.com/attachments/8308-bq24753a_selection-png-2460x0-png.147827/", "text": "Hey I am a newbie.\nIm tired of hard to find management systems so i wanna learn, so far i am re**rded.\nIf anyone with free time could consult me a bit i would appreciate it a lot.\ni want a management system at least with low voltage cut off since i have no problem using specific chargers but charging circuit would also be nice and balancing.\nBattery is lifpo4 6 cells 3.2v 15a big ass cells.\ni want them for a 200w Bluetooth speaker. i guess i also need some kind of voltage regulator so i don't drop wattage when discharging.\nthe amp is cheapest 200w with pops. sub and a full range and tweeter 2 passive rads.\nAI recommends me BQ7692000PW and it seems good but it needs i think a comparator but i am not sure since all diagrams say host or some IC.\n\nas much as i understand i need a voltage divider which i can make from resistors and then a voltage regulator also a competitor and a MosFet for switching. and then something for monitoring the cell voltage.\nI just wanna make sure i buy all the necessary parts and they can take the 15A.\nalso a schematic would be nice\ni will add the ones i took a look at and didn't completely understand. \nThanks in advance.\nI am sorry for duplicate thread others were for low current and 1 cell as much as i saw.", "answerCount": 1, "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.electro-tech-online.com/members/maltais14.328081/", "name": "Maltais14", "url": "https://www.electro-tech-online.com/members/maltais14.328081/" }, "suggestedAnswer": [ { "@type": "Answer", "datePublished": "2024-11-23T16:08:15+00:00", "url": "https://www.electro-tech-online.com/posts/1457768/", "text": "I cannot see any balancing circuit in the schematic. Add a balancing circuit for the 6 cells, either using an external IC (e.g., BQ76920 or BQ76200) or discrete components. Your battery pack is a 6-cell LiFePO4 configuration (3.2V nominal per cell), meaning a total nominal voltage of 19.2V and a max charge voltage of ~21.6V. Check if the OVPSET (over-voltage protection setpoint) and SRSET (current limit) resistors are correctly calculated to support these values. If you want to see some more BMS circuits for more references, you can see one here: https://www.pcbway.com/project/shareproject/bq40z50_r2_BMS_4S_681f1491.html", "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.electro-tech-online.com/members/aliarifat794.325293/", "name": "aliarifat794", "url": "https://www.electro-tech-online.com/members/aliarifat794.325293/" } } ] }, "publisher": { "@type": "Organization", "name": "Electronics Forum (Circuits, Projects and Microcontrollers)", "description": "An electronics forum to talk all about circuits and projects.", "url": "https://www.electro-tech-online.com" } } </script>  <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-MMC9PJ9" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>   <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-KLX5R59" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>  <script> $(function(){ var notice = $('.xb-welcome-notice'); if(notice.length){ var cookie = XF.Cookie.get('hide_welcome_notice'); if(!cookie){ XF.Cookie.set('hide_welcome_notice', Date.now()); notice.show(); } else if ((Date.now() - cookie) > 8.64e+7){ XF.Cookie.set('hide_welcome_notice', Date.now()); notice.show(); } else { notice.hide(); } } }); </script> </div> </body> </html>

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