CN102668308A - 用于平衡串联连接的电池单元的充电的电路 - Google Patents
用于平衡串联连接的电池单元的充电的电路 Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
- H02J7/04—Regulation of charging current or voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
- H02J7/16—Regulation of the charging current or voltage by variation of field
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
本发明公开一种用于防止对电池单元过度充电的电路,所述过度充电保护电路具有:电压检测器,其用于监控跨所述电池单元的电压;极性保护电路,其用于保护所述电压检测器使其在所述电池单元反极性地连接到所述电压检测器时不会被损坏。所述极性保护电路包括跨所述电压检测器的电压检测输入端耦合的半导体装置。所述半导体装置适于在所述电池单元反极性地连接到所述电压检测器时使跨所述电压检测器的所述电压检测输入端的电流分流。
Description
相关申请的交叉引用
技术领域
本发明涉及一种平衡串联连接的电池单元例如锂离子电池单元的充电的电池充电电路。
本发明还防止在电池单元反极性地连接到电池充电电路的情况下对电池单元造成损坏。
发明背景
满电的磷酸铁锂(LFP)电池单元的额定电压大约是3.65伏。这个电压是取决于电池化学性质并且对于具有其他锂离子化学性质的电池单元而言可发生变化。
当对串联连接的锂离子电池单元充电时,单元不一定以相同速度充电。因此其中一个电池单元可在另一电池单元或单元达到其额定电压之前开始超过其额定电压。由于电池充电器通常在串联连接单元的累积串联电压达到阈值电压之前不会停止对单元充电,所以首先达到其额定电压的单元最后可能被过度充电,这可能损坏特定的电池单元。
在电池充电器反极性地连接到一个或多个电池单元的情况下也可能存在问题。
本发明是提供用于解决这些问题以及其他问题。
附图简述
图1是根据本发明的电池充电器的方块图,所述电池充电器耦合到两个串联连接的电池单元;
图2是包含在图1的电池充电器中的电路的第一实施方案的示意图,所述电路用于平衡对电池单元的充电;以及
图3是包含在图1的电池充电器中的电路的第二实施方案的示意图,所述电路用于平衡对电池单元的充电。
具体实施方式
尽管本发明可以有许多不同形式的实施方案,但是图式中只显示本发明的优选实施方案,并且将在本文中在理解本公开内容应被视为对本发明原理的示例并且并非旨在将本发明的广泛方面限于所阐释实施方案的情况下具体描述所述优选实施方案。
图1中示出耦合到两个电池单元12的电池充电器10。电池单元12可以是额定满电电压为3.65伏的类型的常规磷酸铁锂电池单元,或可以是另一类型的可再充电电池单元。
多个电池充电电路18与电池充电器10相关,每个电池单元12与一个电池充电电路相关。
图2中示出电池充电电路18的第一实施方案的示意图。电池充电电路18包括第一电极20和第二电极22,第一电极20耦合到其各自电池单元12的正极端子,第二电极22耦合到其各自电池单元12的负极端子。
电池充电电路18包括电压检测器24,例如日本Seiko Instruments,Inc.出售的检测电压值为3.5伏的S-80835IC电压检测器。电池充电电路18进一步包括电子开关28,例如德克萨斯州,达拉斯,Diodes Incorporated出售的型号为ZXMN6A07FTA的Zetex N沟道MOSFET。电池充电电路18还包括常规黄光LED 36。
在正常操作时,电池充电器18提供电流使之流过串联连接的单元12。与每个单元12相关的电压检测器24监控跨其各自一个单元12的电压。只要电压足够低,电压检测器24的输出便可将电子开关28维持在断开位置。因此充电电流将流过各自单元12。然而,当电压检测器24检测到跨其各自单元12的电压已达到范围在3.6伏到3.68伏的电压时,电压检测器24的输出导致电子开关28闭合,因此使该特定单元12周围的充电电流分流,流过电阻器30、32和34,并且有效地停止对该特定单元12充电。同样这分流电流也点亮LED 36。并联使用多个电阻器以减小流过任何一个特定电阻器的电流,因此允许使用较低瓦特数的电阻器。
如果跨该特定单元12的电压随后下降到低于3.5伏,那么电压检测器将导致电子开关28再次断开,从而导致全部充电电流流过特定单元12。
图3中示出本发明的第二实施方案。所述第二实施方案在电池单元反极性地连接到充电器的情况下保护电池单元。如果是反极性,那么由于通常典型的电池充电器的电流限于只允许有限量的电流来对电池单元进行充电,所以电池充电器是完好的。进一步来说,电池单元在常规充电器耗尽正被充电的电池单元的所存储电荷之前通常不会被损坏。这时,常规电池单元充电器通常会尝试对电池单元反向充电。理想电容器而非电池单元会对负极性充电。然而,由于所涉及的化学性质,电池单元会趋于形成内部短路。
在图2中所示的实施方案中,所用电压检测器确定何时进行平衡电流泄放或溢出,并且由于反向输入极性,这个电压检测器可能被损坏。
在图3中示出电池充电电路18’的第二实施方案。这个电路18’是提供用于在电池单元12反极性连接的情况下保护电压检测器24。
电路18’在电路路径中包括呈PNP晶体管40形式的二极管状装置以进行分流,从而为电压检测器24消除任何来自反极性连接的电流。
根据第二实施方案的电池充电电路18’包括电压检测器24’,电压检测器24’的检测电压值低于上述电压检测器24,以补偿跨晶体管40的大约0.2v电压降。电压检测器24’可以是由阿塞拜疆,菲尼克斯ON Semiconductor出售的NCP300LSNT1G电压检测器,或者可以是由日本Seiko Instruments出售的S-80834CLMC-B6TT2G电压检测器。
第二实施方案18’还包括第二电子开关28’和第二并联电阻器对,第二电子开关28’和第二并联电阻器对与第一电子开关和对应并联电阻器对并联,以减小流过第一电子开关28的分流电流量。第一电子开关28和第二电子开关28’包括在电池单元12以反向偏压方式安装的情况下允许电流流动的固有二极管特性。这电流流动点亮红光LED 46来指示何时电流在错误方向上流动。电子开关18、18’和LED 36、46’不会受到反向电池单元连接的不利影响。
应注意,即使在电路18’的情况下,也有可能将充电器反极性地连接到电池单元12并且耗尽电池单元的电荷。极性保护是针对连接到电池单元时的平衡电路。
尽管已阐释并描述了具体实施方案,但是也可在不显著背离本发明的精神下想出大量修改,并且保护范围只受随附权利要求书范围的限制。
Claims (21)
1.一种用于防止对电池单元过度充电的电路,所述过度充电保护电路具有:电压检测器,用于监控跨所述电池单元的电压;极性保护电路,用于保护所述电压检测器使其在所述电池单元反极性地连接到所述电压检测器时不会被损坏,所述极性保护电路包括跨所述电压检测器的电压检测输入端耦合的半导体装置,所述半导体装置适于在所述电池单元反极性地连接到所述电压检测器时使跨所述电压检测器的所述电压检测输入端的电流分流。
2.根据权利要求1所述的极性保护电路,其中所述半导体装置包括晶体管。
3.根据权利要求2所述的极性保护电路,其中所述晶体管包括双极晶体管。
4.根据权利要求3所述的极性保护电路,其中所述双极晶体管包括PNP晶体管。
5.根据权利要求1所述的极性保护电路,其包括用于指示所述电池单元反极性地连接到所述电压检测器的指示器。
6.根据权利要求6所述的极性保护电路,其中所述指示器包括与所述半导体装置串联耦合的LED。
7.一种用于防止对电池单元过度充电的电路,其包括:
电压检测器,其用于监控跨电池单元的电压,所述电压检测器配置为确定跨所述电池单元的所述电压何时大于第一阈值电压;
电子开关,其对所述电压检测器作出响应并且配置为在所述电压检测器已确定所述电池单元电压大于所述第一阈值电压时使所述电池单元周围的电流分流;以及
半导体装置,其跨所述电压检测器的电压检测输入端耦合,所述半导体装置适于在所述电池单元反极性地连接到所述电压检测器时使跨所述电压检测器的所述电压检测输入端分流。
8.根据权利要求7所述的极性保护电路,其中所述半导体装置包括晶体管。
9.根据权利要求8所述的极性保护电路,其中所述晶体管包括双极晶体管。
10.根据权利要求9所述的极性保护电路,其中所述双极晶体管包括PNP晶体管。
11.根据权利要求7所述的极性保护电路,其包括用于指示所述电池单元反极性地连接到所述电压检测器的指示器。
12.根据权利要求11所述的极性保护电路,其中所述指示器包括与所述半导体装置串联耦合的LED。
13.根据权利要求7所述的电路,其中:
所述电压检测器配置为确定跨所述电池单元的所述电压何时小于第二阈值电压;以及
所述电子开关配置为在所述电压检测器已确定跨所述电池单元的所述电压小于所述第二阈值电压时停止使所述电池单元周围的电流分流。
14.根据权利要求13所述的电路,其中所述第二阈值电压小于所述第一阈值电压。
15.根据权利要求14所述的电路,其中所述电子开关包括半导体装置。
16.根据权利要求15所述的电路,其中所述电子开关包括多个并联耦合的半导体装置。
17.根据权利要求7所述的电路,其中所述电子开关包括MOSFET半导体装置。
18.根据权利要求7所述的电路,其中所述电子开关包括多个并联耦合的MOSFET半导体装置。
19.根据权利要求7所述的电路,其包括用于指示电流正在所述电池单元周围被分流的指示器。
20.根据权利要求7所述的电路,其包括用于在视觉上指示电流正在所述电池单元周围被分流的指示器。
21.根据权利要求9所述的电路,其中所述视觉指示器包括与所述电子开关串联耦合的LED。
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US61/253,651 | 2009-10-21 | ||
US12/871,471 | 2010-08-30 | ||
US12/871,471 US20110089908A1 (en) | 2009-10-21 | 2010-08-30 | Circuitry for balancing charging of series connected battery cells |
PCT/US2010/053595 WO2011050191A1 (en) | 2009-10-21 | 2010-10-21 | Circuitry for balancing charging of series connected battery cells |
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US9213066B2 (en) * | 2012-12-13 | 2015-12-15 | John Manford Wade | Multiple cell battery voltage measurement |
US10424948B2 (en) | 2015-07-01 | 2019-09-24 | Carrier Corporation | Receptacle for monitoring and controlling parallel batteries |
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- 2010-10-21 CN CN2010800476554A patent/CN102668307A/zh active Pending
- 2010-10-21 EP EP10825690.0A patent/EP2491636A4/en not_active Withdrawn
- 2010-10-21 CN CN201080047656.9A patent/CN102668308B/zh not_active Expired - Fee Related
- 2010-10-21 WO PCT/US2010/053595 patent/WO2011050191A1/en active Application Filing
- 2010-10-21 EP EP10825692.6A patent/EP2491637B1/en not_active Not-in-force
- 2010-10-21 KR KR1020127012737A patent/KR20120099041A/ko not_active Application Discontinuation
- 2010-10-21 WO PCT/US2010/053592 patent/WO2011050189A1/en active Application Filing
- 2010-10-21 KR KR1020127012736A patent/KR20120099040A/ko not_active Application Discontinuation
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Also Published As
Publication number | Publication date |
---|---|
WO2011050189A1 (en) | 2011-04-28 |
EP2491637A1 (en) | 2012-08-29 |
US20110089908A1 (en) | 2011-04-21 |
KR20120099040A (ko) | 2012-09-06 |
CN102668308B (zh) | 2016-03-16 |
EP2491637A4 (en) | 2013-11-06 |
EP2491636A1 (en) | 2012-08-29 |
CN102668307A (zh) | 2012-09-12 |
EP2491636A4 (en) | 2013-08-28 |
WO2011050191A1 (en) | 2011-04-28 |
KR20120099041A (ko) | 2012-09-06 |
EP2491637B1 (en) | 2016-03-30 |
US20110089902A1 (en) | 2011-04-21 |
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