CN102412564A - Battery pack, protection circuit and method thereof - Google Patents
Battery pack, protection circuit and method thereof Download PDFInfo
- Publication number
- CN102412564A CN102412564A CN2010102908041A CN201010290804A CN102412564A CN 102412564 A CN102412564 A CN 102412564A CN 2010102908041 A CN2010102908041 A CN 2010102908041A CN 201010290804 A CN201010290804 A CN 201010290804A CN 102412564 A CN102412564 A CN 102412564A
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- battery
- protection switch
- abnormal operation
- power brick
- electrodes
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Abstract
The invention provides a battery pack, a protection circuit and a method thereof. An electrical switch is used to provide intelligent type protection for the battery pack to confront abnormal operation. The protection circuit and method are used to detect a cell state so as to control the electrical switch and eliminate the cell with abnormal state. Once the abnormal state disappears, the battery pack can return to a normal state.
Description
Technical field
The present invention is relevant for a kind of power brick (battery pack), particularly about a kind of protective circuit and method of power brick.
Background technology
Power brick is the encapsulation that one group of any amount of battery series, parallel or connection in series-parallel mix, in order to voltage, capacity or the power density of wanting to be provided.As shown in Figure 1, single-unit (single cell) power brick 10 comprises that single battery (cell) 12 is connected between electrode 14 and 16.For protection is provided, increases polysilicon fuse 18 and connect with battery 12.When abnormal operations took place for battery 12, for example overcurrent or overheated (overtemperature) with producing a large amount of heat fusing polysilicon fuses 18, thereby avoided power brick 10 damages.Yet the time of polysilicon fuse 18 fusings approximately needs the hundreds of millisecond, and therefore the reaction speed of this protected mode is very slow, and after polysilicon fuse 18 fusings, the polysilicon fuse that must more renew just can make power brick 10 task again.In addition, the time of polysilicon fuse 18 fusings is difficult to control, therefore can't set overcurrent or overheated trip point (trip point) accurately.
If a battery includes a plurality of batteries, then said power brick is more piece (multi-cell) power brick.For example in Fig. 2, multiple batteries bag 20 comprises that battery (cell) 12,22,24 is connected between electrode 14 and 16.Likewise, for protection is provided, polysilicon fuse 18 is connected with battery 12,22,24.This protected mode is except having above-mentioned shortcoming; Because polysilicon fuse 18, battery 12,22,24 all are cascaded; Therefore need only wherein any one battery generation abnormality; For example battery 22, and then polysilicon fuse 18 will melt and cut off current path, causes power brick 20 to work.
In above-mentioned protected mode, the use of polysilicon fuse and configuration thereof cause user's inconvenience, therefore need seek new solution.
Summary of the invention
One of the object of the invention is to propose a kind of protective circuit and method of power brick.
One of the object of the invention is to propose a kind of power brick with intelligent protection.
According to the present invention, a kind of protective circuit of power brick comprises that protection switch and one or more battery are connected between two electrodes, and testing circuit is in order to the detection battery status, and control circuit is according to the said protection switch of output signal controlling of said testing circuit.When said one or more battery generation abnormal operation, said control circuit cuts off said protection switch, to get rid of the battery of abnormality; After unusual condition disappeared, the said protection switch of said control circuit conducting was to reply the said battery that has been excluded to normal condition.The preferably comprises that also bypass cock is switched by said control circuit, and conducting when unusual condition is with the battery of bypass abnormality.
According to technical scheme provided by the invention; Utilize a kind of guard method of power brick to comprise whether detecting one or more battery, abnormal operation takes place,, then use first control signal to cut off the protection switch of connecting with the abnormality battery if having; To get rid of the battery of said abnormality; After unusual condition disappeared, the said protection switch of conducting was to reply the said battery that has been excluded to normal condition.The preferably uses the second control signal conducting bypass cock, with the battery of the said abnormality of bypass when also being included in unusual condition.
Description of drawings
Fig. 1 is known single battery bag;
Fig. 2 is known multiple batteries bag;
Fig. 3 is according to the circuit of the first embodiment of the present invention under normal condition;
Fig. 4 is the circuit of embodiment under abnormality of Fig. 3;
Fig. 5 is the circuit under normal condition according to a second embodiment of the present invention;
Fig. 6 is the circuit of embodiment under abnormality of Fig. 5;
Fig. 7 is an a third embodiment in accordance with the invention; And
Fig. 8 is an a fourth embodiment in accordance with the invention.
Drawing reference numeral
10 power brick
12 batteries
14 electrodes
16 electrodes
18 polysilicon fuses
20 power brick
22 batteries
24 batteries
26 power brick
28 protective circuits
30 testing circuits
32 control circuits
34 power brick
The electronic circuit of 36 protective circuits
The electronic circuit of 38 protective circuits
The electronic circuit of 40 protective circuits
42 testing circuits
44 control circuits
46 power brick
48 protective circuits
50 testing circuits
52 control circuits
54 power brick
Embodiment
With reference to Fig. 3 and Fig. 4, multiple batteries bag 26 according to the present invention comprises that protective circuit 28 provides the intelligent protection of antagonism abnormal operation.In protective circuit 28, protection switch SW1 and battery 12,22,24 are connected between electrode 14 and 16, and testing circuit 30 connects the two ends of battery strings 12,22,24; By it electric power is provided; And detect it whether abnormal operation takes place, overcurrent or overheated etc. for example, control circuit 32 also connects the two ends of battery strings 12,22,24; By it electric power is provided, and controls protection switch SW1 according to the output signal PS1 decision control signal CS1 of testing circuit 30.Protection switch SW1 is an electronic switch, for example power MOSFET.Power brick 26 is under normal condition, and is as shown in Figure 3, and protection switch SW1 is conducting; In case the generation abnormal operation, control circuit 32 is with tripping protection switch SW 1, and is as shown in Figure 4; Thereby eliminating battery strings 12,22,24; After unusual condition disappears, control circuit 32 conducting protection switch SW1, so power brick 26 task more again.The detection that comprises the various safeguard measures of overcurrent protection (OCP) and overtemperature protection (OTP) is a known technology; Producing the control signal diverter switch in response to signal also is known technology, therefore no longer the detailed circuit of testing circuit 30 and control circuit 32 is done explanation more.
Though the foregoing description is with the explanation of multiple batteries bag, the technical staff in present technique field also is the same in the application of single battery bag from wherein understanding, and just battery strings 12,22,24 changes single battery into.
Because protective circuit 28 is to utilize electronic switch SW1 that protection is provided, therefore can set the trip point of overcurrent, overheated or other safeguard measures accurately, and when abnormal operation takes place; Electronic switch SW1 can be cut off immediately; The time of several microseconds of these needs, in addition, after unusual condition disappears; Power brick 26 just can automatically reply normal condition task again, and these all let the use of power brick 26 more convenient.
In various embodiment, independent protection is provided to batteries different in the multiple batteries bag.For example shown in Figure 5, in multiple batteries bag 34, battery 12,22,24 is connected between electrode 14 and 16, and protective circuit comprises that three groups of electronic circuits 36,38,40 protect battery 12,22,24 respectively.In electronic circuit 36; The operation of protection switch SW1, testing circuit 42, control circuit 44 is identical with corresponding element among Fig. 3; The bypass cock SW2 that increases is parallelly connected with protection switch SW1 and battery 12, and the control signal CS2 that its controlled circuit 44 provides controls, and cuts off during for normal condition at battery 12; Conducting when abnormal operation takes place battery 12, thereby bypass battery 12.Electronic circuit 38 has identical composition with 40 with electronic circuit 36, and its operation also is the same. Electronic circuit 36,38,40 required power supplys are supplied by the battery 12,22,24 of its each self-shield.Switch SW 1-SW6 is electronic switch all.As shown in Figure 5; When power brick 34 under normal condition; All conductings of protection switch SW 1, SW3, SW5, bypass cock SW2, SW4, SW6 all cut off, and electric current flows to electrode 14 from electrode 16 through protection switch SW5, battery 24, protection switch SW3, battery 22, protection switch SW1, battery 12.When any one battery generation abnormal operation, for example battery 22, and is as shown in Figure 6; Protection switch SW3 cuts off and bypass cock SW4 conducting, so bypass battery 22, and electric current changes the bypass cock SW4 that flows through; Thereby keep current path between electrode 14 and 16, power brick 34 still can work on.The abnormality that detects battery 22 when testing circuit 42 disappears, and control circuit 44 cuts off bypass cock SW4 and conducting protection switch SW3, so battery 22 is resumed work.
Though in the embodiment of Fig. 5, battery of each electronic circuit protection of protective circuit, these those skilled in the art are from wherein understanding, and in various embodiment, a sub-circuit can be protected a plurality of batteries, just as the embodiment that kind of Fig. 3.In addition, the technical staff in present technique field can understand from the embodiment of Fig. 5, and the embodiment of Fig. 3 also can increase bypass cock, and conducting is with bypass battery strings 12,22,24 when abnormal operation takes place power brick 26.
The embodiment of Fig. 5 makes an amendment as shown in Figure 7 slightly; In multiple batteries bag 46; Protective circuit 48 required power supplys are supplied by electrode 14 and 16; Testing circuit 50 detects battery 12,22,24 whether abnormal operation takes place, and control circuit 52 is according to output signal PS [1:3] the control switch SW1-SW6 of testing circuit 50.If the use multiplexer, the size of testing circuit 50 can be reduced a lot.
Fig. 8 is another embodiment, and in multiple batteries bag 54, battery 12 and 22 is connected in parallel between electrode 14 and 16, and protective circuit 48 comprises that protection switch SW1 and SW3 connect with battery 12 and 22 respectively, and testing circuit 50 and control circuit 52 are by electrode 14 and 16 power supplies.Testing circuit 50 detects battery 12 and 22 whether abnormal operation takes place; Control circuit 52 is according to output signal PS 1 and the PS2 control protection switch SW1 and the SW3 of testing circuit 50; For example when abnormal operation takes place in battery 22; Tripping protection switch SW 3 is to get rid of battery 22, in case unusual condition disappears, conducting protection switch SW3 lets battery 22 resume work.
Though the present invention discloses as above with preferred embodiment; Right its is not that those skilled in the art is not breaking away from the spirit and scope of the present invention in order to qualification the present invention; When can doing a little change and retouching, so protection scope of the present invention is when being as the criterion with claim institute confining spectrum.
Claims (13)
1. a power brick is characterized in that, said power brick comprises:
Two electrodes;
Battery;
Protection switch, and said battery is connected between said two electrodes;
Testing circuit connects said battery, detects it whether abnormal operation takes place; And
Control circuit connects said testing circuit, according to the said protection switch of output signal controlling of said testing circuit;
Wherein, said control circuit cuts off said protection switch when said battery generation abnormal operation.
2. power brick as claimed in claim 1; It is characterized in that; Said power brick comprises that also bypass cock is parallelly connected with said battery and protection switch, and controlled by said control circuit, wherein; Said control circuit is the said bypass cock of conducting when said battery generation abnormal operation, with the said battery of bypass.
3. the protective circuit of a power brick is characterized in that, said power brick has two electrodes and battery, and said protective circuit comprises:
Protection switch, and said battery is connected between said two electrodes;
Testing circuit connects said battery, detects it whether abnormal operation takes place; And
Control circuit connects said testing circuit, according to the said protection switch of output signal controlling of said testing circuit;
Wherein, said control circuit cuts off said protection switch when said battery generation abnormal operation.
4. protective circuit as claimed in claim 3; It is characterized in that; Said protective circuit comprises that also bypass cock is parallelly connected with said battery and protection switch, and controlled by said control circuit, wherein; Said control circuit is the said bypass cock of conducting when said battery generation abnormal operation, with the said battery of bypass.
5. the guard method of a power brick is characterized in that, said power brick has two electrodes and battery, and said guard method comprises the following steps:
(A) configuration protection switch and said battery are connected between said two electrodes;
(B) detect said battery whether abnormal operation takes place;
(C) when said battery generation abnormal operation, cut off said protection switch; And
(D) after unusual condition disappears, the said protection switch of conducting.
6. guard method as claimed in claim 5 is characterized in that said guard method also comprises the following steps:
The configuration bypass cock is parallelly connected with said battery and protection switch; And
The said bypass cock of conducting when said battery generation abnormal operation is with the said battery of bypass.
7. a power brick is characterized in that, said power brick comprises:
Two electrodes;
A plurality of batteries are connected between said two electrodes; And
Protective circuit connects said a plurality of battery, and said protective circuit comprises a plurality of electronic circuits, and each electronic circuit is in order to battery of independent protective, and wherein each electronic circuit comprises:
Protection switch is connected with the battery of being protected;
Bypass cock is parallelly connected with battery of being protected and said protection switch;
Testing circuit connects the battery of being protected, and detects it whether abnormal operation takes place; And
Control circuit connects said testing circuit, according to the said protection switch of output signal controlling and the bypass cock of said testing circuit;
Wherein, said control circuit cuts off said protection switch when the battery generation abnormal operation of being protected, and the said bypass cock of conducting, the battery of being protected with bypass.
8. a power brick is characterised in that, said power brick comprises:
Two electrodes;
First and second battery is connected between said two electrodes;
First protection switch is with the series connection of said first battery and directly be connected said first battery;
Second protection switch is with the series connection of said second battery and directly be connected said second battery;
First bypass cock, parallelly connected with said first battery and first protection switch;
Second bypass cock, parallelly connected with said second battery and second protection switch;
Testing circuit connects said first and second battery, detects said first and second battery whether abnormal operation takes place; And
Control circuit connects said testing circuit, according to said first and second protection switch of the output signal controlling of said testing circuit and first and second bypass cock;
Wherein, Said control circuit cuts off said first protection switch when the said first battery generation abnormal operation; And said first bypass cock of conducting with said first battery of bypass, and cuts off said second protection switch when the said second battery generation abnormal operation; And said second bypass cock of conducting is with said second battery of bypass.
9. the protective circuit of a power brick is characterised in that, said power brick has two electrodes and two batteries are connected between said two electrodes, and said protective circuit comprises:
First protection switch is with the series connection of first battery in said two batteries and directly be connected said first battery;
Second protection switch is with the series connection of second battery in said two batteries and directly be connected said second battery;
First bypass cock, parallelly connected with said first battery and first protection switch;
Second bypass cock, parallelly connected with said second battery and second protection switch;
Testing circuit connects said two batteries, detects said two batteries whether abnormal operation takes place; And
Control circuit connects said testing circuit, according to said first and second protection switch of the output signal controlling of said testing circuit and first and second bypass cock;
Wherein, Said control circuit cuts off said first protection switch when the said first battery generation abnormal operation; And said first bypass cock of conducting with said first battery of bypass, and cuts off said second protection switch when the said second battery generation abnormal operation; And said second bypass cock of conducting is with said second battery of bypass.
10. the guard method of a power brick is characterised in that, said power brick has two electrodes and two batteries are connected between said two electrodes, and said guard method comprises:
(A) configuration first protection switch is connected with first battery in said two batteries, and wherein said first protection switch directly connects said first battery;
(B) configuration second protection switch is connected with second battery in said two batteries, and wherein said second protection switch directly connects said second battery;
(C) configuration first bypass cock is parallelly connected with said first battery and first protection switch;
(D) configuration second bypass cock is parallelly connected with said second battery and second protection switch;
(E) detect said two batteries whether abnormal operation takes place;
(F) when the said first battery generation abnormal operation, cut off said first bypass cock of said first protection switch and conducting, and when the said second battery generation abnormal operation, cut off said second bypass cock of said second protection switch and conducting; And
(G) after the unusual condition of said first battery disappeared, said first protection switch of conducting also cut off said first bypass cock, and after the unusual condition of said second battery disappeared, said second protection switch of conducting also cut off said second bypass cock.
11. a power brick is characterised in that, said power brick comprises:
Two electrodes;
First and second battery is connected in parallel between said two electrodes;
First protection switch is connected with said first battery;
Second protection switch is connected with said second battery;
Testing circuit connects said first and second battery, detects said first and second battery whether abnormal operation takes place; And
Control circuit connects said testing circuit, according to said first and second protection switch of the output signal controlling of said testing circuit;
Wherein, said control circuit cuts off said first protection switch when the said first battery generation abnormal operation, when the said second battery generation abnormal operation, cuts off said second protection switch.
12. the protective circuit of a power brick is characterised in that, said power brick has two electrodes and two batteries are connected in parallel between said two electrodes, and said protective circuit comprises:
First protection switch is connected with first battery in said two batteries;
Second protection switch is connected with second battery in said two batteries;
Testing circuit connects said two batteries, detects said two batteries whether abnormal operation takes place; And
Control circuit connects said testing circuit, according to said first and second protection switch of the output signal controlling of said testing circuit;
Wherein, said control circuit cuts off said first protection switch when the said first battery generation abnormal operation, and when the said second battery generation abnormal operation, cuts off said second protection switch.
13. the guard method of a power brick is characterised in that, said power brick has two electrodes and two batteries are connected in parallel between said two electrodes, and said guard method comprises:
(A) configuration first protection switch is connected with first battery in said two batteries;
(B) configuration second protection switch is connected with second battery in said two batteries;
(C) detect said two batteries whether abnormal operation takes place;
(D) when the said first battery generation abnormal operation, cut off said first protection switch, and when the said second battery generation abnormal operation, cut off said second protection switch; And
(E) after the unusual condition of said first battery disappears, said first protection switch of conducting, and after the unusual condition of said second battery disappears, said second protection switch of conducting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102908041A CN102412564A (en) | 2010-09-21 | 2010-09-21 | Battery pack, protection circuit and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102908041A CN102412564A (en) | 2010-09-21 | 2010-09-21 | Battery pack, protection circuit and method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102412564A true CN102412564A (en) | 2012-04-11 |
Family
ID=45914486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102908041A Pending CN102412564A (en) | 2010-09-21 | 2010-09-21 | Battery pack, protection circuit and method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102412564A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104821615A (en) * | 2015-03-13 | 2015-08-05 | 超威电源有限公司 | Intelligent power supply system and intelligent management method thereof |
| CN105337327A (en) * | 2014-08-07 | 2016-02-17 | 南京理工自动化研究院有限公司 | N/M redundancy equilibrium strategy based power lithium battery management system |
| CN108461696A (en) * | 2017-02-20 | 2018-08-28 | 通用电气航空系统有限公司 | The battery pack that voltage change reduces |
| CN109830764A (en) * | 2017-11-23 | 2019-05-31 | 台达电子工业股份有限公司 | Have the battery module and electrical storage device and its operating method of abnormal detection function |
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| CN1536730A (en) * | 2003-04-04 | 2004-10-13 | 京东方科技集团股份有限公司 | Chargeable cell unit whose connection state can be controlled and assembled battery |
| JP2004349186A (en) * | 2003-05-26 | 2004-12-09 | Nec Tokin Tochigi Ltd | Battery pack |
| JP2008278688A (en) * | 2007-05-02 | 2008-11-13 | Seiko Instruments Inc | Battery state monitoring circuit and battery device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1536730A (en) * | 2003-04-04 | 2004-10-13 | 京东方科技集团股份有限公司 | Chargeable cell unit whose connection state can be controlled and assembled battery |
| JP2004349186A (en) * | 2003-05-26 | 2004-12-09 | Nec Tokin Tochigi Ltd | Battery pack |
| JP2008278688A (en) * | 2007-05-02 | 2008-11-13 | Seiko Instruments Inc | Battery state monitoring circuit and battery device |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105337327A (en) * | 2014-08-07 | 2016-02-17 | 南京理工自动化研究院有限公司 | N/M redundancy equilibrium strategy based power lithium battery management system |
| CN105337327B (en) * | 2014-08-07 | 2018-09-04 | 南京理工自动化研究院有限公司 | Dynamic lithium battery based on N/M redundancy balance policies manages system |
| CN104821615A (en) * | 2015-03-13 | 2015-08-05 | 超威电源有限公司 | Intelligent power supply system and intelligent management method thereof |
| CN108461696A (en) * | 2017-02-20 | 2018-08-28 | 通用电气航空系统有限公司 | The battery pack that voltage change reduces |
| US10958083B2 (en) | 2017-02-20 | 2021-03-23 | Ge Aviation Systems Limited | Battery pack with reduced voltage variance |
| CN108461696B (en) * | 2017-02-20 | 2022-01-25 | 通用电气航空系统有限公司 | Battery pack with reduced voltage variation |
| CN109830764A (en) * | 2017-11-23 | 2019-05-31 | 台达电子工业股份有限公司 | Have the battery module and electrical storage device and its operating method of abnormal detection function |
| CN109830764B (en) * | 2017-11-23 | 2021-08-06 | 台达电子工业股份有限公司 | Battery module and power storage device with abnormality detection function and operation method thereof |
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Application publication date: 20120411 |