CN103107521A - Multi-string lithium battery set protective board - Google Patents
Multi-string lithium battery set protective board Download PDFInfo
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- CN103107521A CN103107521A CN2013100620743A CN201310062074A CN103107521A CN 103107521 A CN103107521 A CN 103107521A CN 2013100620743 A CN2013100620743 A CN 2013100620743A CN 201310062074 A CN201310062074 A CN 201310062074A CN 103107521 A CN103107521 A CN 103107521A
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Abstract
The invention provides a multi-string lithium battery set protective board which comprises a voltage stabilizing circuit and a comparing switch circuit which are in parallel connection between a negative electrode charging node and a positive electrode charging node of each string of lithium battery set. A charge and discharge switch is connected between the comparing switch circuit and a ground connection end of a negative electrode grounded first lithium battery. The multi-string lithium battery set protective board has the advantages that the protective board is suitable for charge and discharge protection of a plurality of strings of the lithium battery sets, voltage difference among each single battery is smaller than a preset value (usually +/-20 mA) after the battery set is fully charged, even charge of each single battery of the battery set is achieved, charging effect in a parallel connection charging method is effectively improved, voltage of each single battery in the battery set is detected, service lift of each battery is prolonged and the product can work stably and reliably for a long time in an environment with the temperature between -20 DEG C to +60 DEG C.
Description
Technical field
The present invention relates to lithium cell charging resist technology field, relate in particular to a kind of multi-series lithium battery pack protection board.
Background technology
In the lithium ion battery use procedure, for the mistake of avoiding the user is used and the continuous firing of charger causes the battery intensification, the decomposition of battery electrolyte inside and produce gas and make and press liter in it, disengaging of lithium metal etc. and cause danger on fire and that break.Therefore, all to adopt protective circuit in the lithium ion battery loop, Li-Ion rechargeable battery is protected, the over-charge protective function must be arranged, with the deterioration in characteristics that prevents battery, on fire and break, guarantee the safety and reliability of battery.
In the prior art; mostly protective circuit is the charge protection for a string battery pack, and the voltage differences between each cell is larger when being full of electricity, and the charge condition of each battery is inhomogeneous; charging effect under the serial connection charge mode is not good, thereby affects the useful life of battery.
Summary of the invention
For the problems referred to above, the problem to be solved in the present invention is to provide a kind of multi-series lithium battery pack protection board of charge balancing.
Technical scheme of the present invention is as follows:
A kind of multi-series lithium battery pack protection board; comprise negative pole and the voltage stabilizing circuit between anodal charge node that is series at every series lithium battery group and compare switching circuit, relatively being connected to a charge and discharge switch between the earth terminal of the first segment lithium battery of switching circuit and minus earth.
Preferably, described voltage stabilizing circuit comprises voltage-stabiliser tube and the current-limiting resistance between the two poles of the earth that are series at every series lithium battery group.
Preferably, described charge and discharge switch is metal-oxide-semiconductor.
Preferably, described relatively switching circuit comprises comparator and triode, the negative pole of an input termination voltage-stabiliser tube of comparator, another input connects anodal charge node by current-limiting resistance, the output of comparator connects the base stage of triode by a resistance, the emitter and collector of described triode connects respectively source electrode and the grid of metal-oxide-semiconductor.
Beneficial effect of the present invention is: lithium battery protection board of the present invention is fit to the charge and discharge protecting of multi-series lithium battery group, can guarantee when being full of electricity between each cell voltage differences less than set point (general ± 20mV), realize all filling of each cell of battery pack, effectively improved the charging effect under the serial connection charge mode; Detect simultaneously the voltage of each cell in battery pack, protect and extend battery, product can long-term reliable and stable work in-20 ℃～+ 60 ℃ ambient temperature ranges.
Description of drawings
Fig. 1 is the circuit theory diagrams of the baffle of a string battery pack of the present invention;
Fig. 2 is circuit theory diagrams of the present invention.
Embodiment
Take n series lithium battery group as example, a kind of preferred embodiment of the present invention is made brief description below in conjunction with accompanying drawing.
As shown in Figure 1, 2:
A kind of multi-series lithium battery pack protection board, comprise negative pole and the voltage stabilizing circuit 1 between anodal charge node B1, B2 to Bn of each the series lithium battery group that is series at n series lithium battery group and compare switching circuit 2, relatively being connected to a charge and discharge switch 3 between the earth terminal of the first segment lithium battery of switching circuit 2 and minus earth;
described voltage stabilizing circuit 1 comprises voltage-stabiliser tube (Z1, Z2 to Zn) and the current-limiting resistance (RA1, RA2 to RAn) between each the series lithium battery group the two poles of the earth that are series at n series lithium battery group, described charge and discharge switch 3 is metal-oxide-semiconductor M1, described relatively switching circuit 2 comprises comparator (A1, A2 to An) with the triode (Q1 of connection corresponding to it, Q2 to Qn), n comparator (A1, A2 to An) a n voltage-stabiliser tube (Z1 corresponding to input termination, Z2 to Zn) negative pole, another input meets a corresponding n anodal charge node (B1 by current-limiting resistance, B2 to Bn), n comparator (A1, A2 to An) output meets corresponding triode (Q1 by a resistance, Q2 to Qn) base stage, described triode (Q1, Q2 to Qn) emitter and collector all connects source electrode and the grid of metal-oxide-semiconductor M1.
the specific works principle is: charger is the charging of multi-series lithium battery group, voltage-stabiliser tube Z1, Z2 to Zn adopts the 3.6V voltage-stabiliser tube, respectively by current-limiting resistance RA1, RA2 to RAn is comparator A1, 3 pins of A2 to An provide a stable 3.6V voltage, along with charger constantly is the charging of multi-series lithium battery group, the anodal charge node B1 of every series lithium battery group, the voltage of B2 to Bn progressively promotes, when its voltage during higher than 4.2V, comparator A1 namely, the voltage of 2 pins of A2 to An is during higher than 4.2V, comparator A1, the internal body diodes conducting of A2 to An, this moment comparator A1, the 4 pin output high level of A2 to An are given corresponding triode Q1, the base stage power supply of Q2 to Qn, as triode Q1, when the base stage of Q2 to Qn has electric current to pass through, according to its characteristic, triode Q1, the collector electrode of Q2 to Qn and emitter conducting, cause short circuit between the grid of metal-oxide-semiconductor M1 and source electrode, thereby the drain electrode of metal-oxide-semiconductor M1 and source electrode are disconnected, namely reach between battery cathode and charger negative pole and form off state, complete the protection process that charger no longer charges for battery.
Take 14 battery pack of going here and there as example as following table 1, with the data that the charge-discharge test instrument is monitored, the data when table 1 is full of electricity for intercepting near battery in 5 minutes.By table 1 finding out of Zhe clearly, this kind of baffle has good current-sharing protective effect to battery, and under the baffle monitoring, the battery error of 14 strings are less than 20mV.
The data when battery pack of table 114 string is full of electricity in 5 minutes
Above one embodiment of the present of invention are had been described in detail, but described content is only preferred embodiment of the present invention, can not be considered to be used to limiting practical range of the present invention.All equalizations of doing according to the present patent application scope change and improve etc., within all should still belonging to patent covering scope of the present invention.
Claims (4)
1. multi-series lithium battery pack protection board; it is characterized in that: comprise negative pole and the voltage stabilizing circuit between anodal charge node that is series at every series lithium battery group and compare switching circuit, relatively being connected to a charge and discharge switch between the earth terminal of the first segment lithium battery of switching circuit and minus earth.
2. multi-series lithium battery pack protection board according to claim 1, it is characterized in that: described voltage stabilizing circuit comprises voltage-stabiliser tube and the current-limiting resistance between the two poles of the earth that are series at every series lithium battery group.
3. multi-series lithium battery pack protection board according to claim 2, it is characterized in that: described charge and discharge switch is metal-oxide-semiconductor.
4. multi-series lithium battery pack protection board according to claim 3; it is characterized in that: described relatively switching circuit comprises comparator and triode; the negative pole of an input termination voltage-stabiliser tube of comparator; another input connects corresponding anodal charge node by current-limiting resistance; the output of comparator connects the base stage of triode by a resistance, the emitter and collector of described triode connects respectively source electrode and the grid of metal-oxide-semiconductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310062074.3A CN103107521B (en) | 2013-02-28 | 2013-02-28 | A kind of multi-series lithium battery pack protection board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310062074.3A CN103107521B (en) | 2013-02-28 | 2013-02-28 | A kind of multi-series lithium battery pack protection board |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103107521A true CN103107521A (en) | 2013-05-15 |
| CN103107521B CN103107521B (en) | 2016-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310062074.3A Expired - Fee Related CN103107521B (en) | 2013-02-28 | 2013-02-28 | A kind of multi-series lithium battery pack protection board |
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| CN (1) | CN103107521B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110266068A (en) * | 2019-06-18 | 2019-09-20 | 季华实验室 | High-tension battery control circuit, control method and storage medium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1163019A (en) * | 1994-10-31 | 1997-10-22 | 摩托罗拉公司 | Protection switch for a battery powered device |
| US5695886A (en) * | 1996-03-07 | 1997-12-09 | Motorola, Inc. | Overvoltage disconnect circuit and battery using same |
| CN201601478U (en) * | 2009-12-31 | 2010-10-06 | 深圳市力通威电子科技有限公司 | Protective circuit of soft-packaged lithium batteries |
| CN202260414U (en) * | 2011-09-05 | 2012-05-30 | 惠州市汉派电池科技有限公司 | Over-charging protection circuit for power lithium ion battery |
-
2013
- 2013-02-28 CN CN201310062074.3A patent/CN103107521B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1163019A (en) * | 1994-10-31 | 1997-10-22 | 摩托罗拉公司 | Protection switch for a battery powered device |
| US5695886A (en) * | 1996-03-07 | 1997-12-09 | Motorola, Inc. | Overvoltage disconnect circuit and battery using same |
| CN201601478U (en) * | 2009-12-31 | 2010-10-06 | 深圳市力通威电子科技有限公司 | Protective circuit of soft-packaged lithium batteries |
| CN202260414U (en) * | 2011-09-05 | 2012-05-30 | 惠州市汉派电池科技有限公司 | Over-charging protection circuit for power lithium ion battery |
Non-Patent Citations (2)
| Title |
|---|
| 王非等: "手持终端设备中的锂电池充电技术", 《电子器件》, vol. 27, no. 4, 31 December 2004 (2004-12-31) * |
| 罗玉涛等: "一种集散式动力电池组动态均衡管理系统", 《电工技术学报》, vol. 23, no. 8, 31 August 2008 (2008-08-31) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110266068A (en) * | 2019-06-18 | 2019-09-20 | 季华实验室 | High-tension battery control circuit, control method and storage medium |
| CN110266068B (en) * | 2019-06-18 | 2023-11-07 | 季华实验室 | High-voltage battery control circuit, control method and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103107521B (en) | 2016-04-06 |
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Granted publication date: 20160406 Termination date: 20170228 |