CN101442204A - Protection method for multi-string ferric phosphate lithium ion battery - Google Patents
Protection method for multi-string ferric phosphate lithium ion battery Download PDFInfo
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- CN101442204A CN101442204A CNA2008101989754A CN200810198975A CN101442204A CN 101442204 A CN101442204 A CN 101442204A CN A2008101989754 A CNA2008101989754 A CN A2008101989754A CN 200810198975 A CN200810198975 A CN 200810198975A CN 101442204 A CN101442204 A CN 101442204A
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Abstract
The invention provides a method for protecting multi-series lithium iron phosphate lithium-ion batteries, which belongs to the field of batteries. When the quantity of batteries in series is more than or equal to two, a battery pack can be resolved into battery pack combinations less than the quantity of the batteries in series of the battery pack, namely any battery pack of which N is more than or equal to two can be resolved according to the following formula: N=2a+3b+4c+5d+6e+7fm, wherein a, b, c, d, e and f are zero or positive integers, and represent that an N-string battery pack is resolved into the combination of the battery packs with a 2 strings, b 3 strings, c 4 strings, d 5 strings, e 6 strings and f 7 strings. The voltage of the battery packs with a 2 strings, b 3 strings, c 4 strings, d 5 strings, e 6 strings and f 7 strings is detected. The battery pack is resolved into the combination of 2 to 7 strings of battery packs, and the voltage of the 2 to 7 strings of battery packs is detected through a voltage detection module. Detection results are output to a MOS tube through a logical operation module, so as to protect the battery packs. The method is used for protecting the battery packs with higher safety, and is particularly suitable for the protection of the lithium iron phosphate lithium-ion batteries, or is used for the secondary protection of the battery packs.
Description
Technical field
Protection method for multi-string ferric phosphate lithium ion battery of the present invention belongs to field of batteries, particularly a kind of protection method for multi-string ferric phosphate lithium ion battery.
Background technology
Lithium ion battery is as being the battery of positive electrode with cobalt acid lithium, LiMn2O4 etc., and overcharging resisting is electric and over-discharge property is poor, poor stability, so at present to the protection of battery pack, need detect single cell voltage.The cost height of battery protecting circuit has limited applying of lithium battery.Disclosing the adjusting device that a kind of lithium battery protection circuit is protected threshold value as Chinese patent CN1553540A, mainly is the mode by dividing potential drop, and battery is protected.Use the method, the protection with interior battery or battery pack is fine for 7 strings to use single-unit li-ion cell protection IC, surpasses more than 7 strings, owing to be protected the restriction of the withstand voltage scope of IC, can't realize with the method.
In recent years, newly developed is the lithium ion battery of positive electrode with the LiFePO4, and overcharging resisting is electric and over-discharge property is good, fail safe is good, can to reduce cost, realize the protection to any string battery pack by reducing the performance of protective circuit.The second class protection of battery pack is as the stand-by protection measure, less demanding to protection circuit.The second class protection circuit also is that single cell voltage in the battery pack is detected at present.
Summary of the invention
The purpose of this invention is to provide a kind of simple, flexible, cheap battery protecting method.
With whole battery group be decomposed into two go here and there seven the string battery pack combination; because the string number of the withstand voltage scope limit battery of protection IC can not be greater than 7 strings; when the quantity of battery series connection more than or equal to two; battery pack can be decomposed combination for the battery pack that is less than battery pack series-connected cell quantity; the battery pack that is any N ≧ 2 all can be decomposed according to following formula; N=2a+3b+4c+5d+6e+7f; a, b, c, d, e, f are 0 or positive integer, and expression is decomposed into N crosstalk pond group the combination of the battery pack of a 2 strings, b 3 string, c 4 string, d 5 string, e 6 string, f 7 string.Use single-unit li-ion cell protection IC that the voltage of a 2 strings, b 3 string, c 4 string, d 5 string, e 6 string, f 7 a string battery pack is detected.
Whole battery group is decomposed into 2 combinations of going here and there 7 string battery pack, and arbitrarily the battery pack of N ≧ 2 all can be decomposed according to following formula, and N=2a+3b+4c+5d+6e+7f, a, b, c, d, e, f are 0 or positive integer.By using the detection of single-unit li-ion cell protection IC to the voltage of a 2 strings, b 3 string, c 4 string, d 5 string, e 6 string, f 7 a string battery pack, the overcharging of protection battery pack, cross put, overcurrent etc., do the detection cost that has reduced battery like this.Since ferric phosphate lithium cell self possess good, the safe characteristic of overcharging resisting electricity over-discharge property, can not produce safety problems such as blast on fire.This kind protection scheme flexibility height can be protected any string battery pack.
It is 2 combinations of going here and there 7 string battery pack that battery pack is decomposed, and detects 2 voltages of going here and there 7 string battery pack by voltage detection module.Use the voltage of voltage detection module detection 2 ~ 7 string battery pack of single-unit li-ion cell protection IC, testing result by logical operation module, is outputed to metal-oxide-semiconductor battery pack is protected.
It is 2 combinations of going here and there 7 string battery pack that battery pack is decomposed, and detects 2 voltages of going here and there 7 string battery pack by voltage detection module.Use the voltage of voltage detection module detection 2 ~ 7 string battery pack of single-unit li-ion cell protection IC, the result is outputed to metal-oxide-semiconductor, battery pack is protected.
Baffle is all protected charging and discharge.
Baffle is only protected charging, and discharge is not protected.
The present invention is used for the protection of the higher battery pack of fail safe, is particularly suitable for the protection of ferric phosphate lithium ion battery group, or is used for the second class protection to battery pack.
Description of drawings
Embodiment
Be described further below in conjunction with accompanying drawing.
As shown in Figure 1; the present invention is decomposed into 7 crosstalk pond groups the combination of two group of two string battery pack B12, B13 and one group of three string battery pack B11; by using voltage detection module U21, the U22 of single-unit li-ion cell protection IC, U23 detects the voltage of two strings and three string battery pack.Testing result by L31, L32 logical operation module, is outputed to metal-oxide-semiconductor Q41, Q42, battery pack is protected.P+ and P-are the terminals that discharges and recharges of battery pack.The voltage detection module of single-unit li-ion cell protection IC can adopt the conventional integrated circuit modules that uses.
As shown in Figure 2; the present invention is decomposed into 7 crosstalk pond groups the combination of two group of two string battery pack B12, B13 and one group of three string battery pack B11; by using voltage detection module U21, the U22 of single-unit li-ion cell protection IC, U23 detects the voltage of two strings and three string battery pack.Testing result by the L32 logical operation module, is outputed to metal-oxide-semiconductor Q42, battery pack is carried out charge protection.P+ and CH are the charging terminals of battery pack; P+ and P-are the discharge terminals of battery pack, connect PTC in the discharge terminal overcurrent and short circuit are shielded.Also can not connect PTC in the discharge terminal overcurrent and short circuit are not had protective effect.The voltage detection module of single-unit li-ion cell protection IC can adopt the S-8261ABCMD-G3C-T2 type IC of NSK electronics, is not limited thereto.
As shown in Figure 3, the present invention is decomposed into two string battery pack B12 with 7 crosstalk pond groups, and the combination of B13 and one group of three string battery pack B11 by using voltage detection module U21, the U22 of single-unit li-ion cell protection IC, detects the voltage of two strings and three string battery pack.Testing result by outputing to metal-oxide-semiconductor Q31, Q32, is protected battery pack.P+ and P-are the terminals that discharges and recharges of battery pack.This scheme is not used logical operation module.
Voltage detection module adopts the conventional integrated circuit modules that uses, such as the S-8261ABCMD-G3C-T2 type IC of NSK electronics.
Claims (5)
1; a kind of protection method for multi-string ferric phosphate lithium ion battery; detect the voltage of battery pack by voltage detection module; testing result is passed through logical operation module; output is protected battery pack; it is characterized in that battery pack is decomposed is the combination that is less than the battery pack of battery pack series-connected cell quantity; the battery pack of N ≧ 2 is decomposed according to following formula arbitrarily; N=2a+3b+4c+5d+6e+7f; a; b; c; d; e; f is 0 or positive integer; expression is decomposed into a 2 strings with N crosstalk pond group; b 3 strings; c 4 strings; d 5 strings; e 6 strings; the combination of the battery pack of f 7 strings uses single-unit li-ion cell protection IC to a 2 strings; b 3 strings; c 4 strings; d 5 strings; e 6 strings; the voltage of f 7 string battery pack detects.
2, protection method for multi-string ferric phosphate lithium ion battery according to claim 1; it is characterized in that using the voltage detection module of single-unit li-ion cell protection IC to detect the voltage of 2 ~ 7 string battery pack; testing result by logical operation module, is outputed to metal-oxide-semiconductor, battery pack is protected.
3, protection method for multi-string ferric phosphate lithium ion battery according to claim 1 is characterized in that using the voltage detection module of single-unit li-ion cell protection IC to detect the voltage of 2 ~ 7 string battery pack, and the result is outputed to metal-oxide-semiconductor, and battery pack is protected.
4, method according to claim 1, it is characterized in that baffle to the charging and discharge protect.
5, method according to claim 1 is characterized in that baffle protects charging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101989754A CN101442204A (en) | 2008-09-28 | 2008-09-28 | Protection method for multi-string ferric phosphate lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101989754A CN101442204A (en) | 2008-09-28 | 2008-09-28 | Protection method for multi-string ferric phosphate lithium ion battery |
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| CN101442204A true CN101442204A (en) | 2009-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2008101989754A Pending CN101442204A (en) | 2008-09-28 | 2008-09-28 | Protection method for multi-string ferric phosphate lithium ion battery |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103217605A (en) * | 2013-03-26 | 2013-07-24 | 中颖电子股份有限公司 | Charger detection device for battery protection cascade system |
| CN103985832A (en) * | 2014-05-08 | 2014-08-13 | 苏州卓德电子有限公司 | Lithium iron phosphate battery pack used for outdoor photoflash lamps |
| CN104779586A (en) * | 2014-01-15 | 2015-07-15 | 苏州宝时得电动工具有限公司 | Battery pack protection circuit, battery pack and electromotive tool |
-
2008
- 2008-09-28 CN CNA2008101989754A patent/CN101442204A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103217605A (en) * | 2013-03-26 | 2013-07-24 | 中颖电子股份有限公司 | Charger detection device for battery protection cascade system |
| CN103217605B (en) * | 2013-03-26 | 2015-07-15 | 中颖电子股份有限公司 | Charger detection device for battery protection cascade system |
| CN104779586A (en) * | 2014-01-15 | 2015-07-15 | 苏州宝时得电动工具有限公司 | Battery pack protection circuit, battery pack and electromotive tool |
| CN103985832A (en) * | 2014-05-08 | 2014-08-13 | 苏州卓德电子有限公司 | Lithium iron phosphate battery pack used for outdoor photoflash lamps |
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Open date: 20090527 |