CN103337889A - Power battery balancing device and method - Google Patents

Power battery balancing device and method Download PDF

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Publication number
CN103337889A
CN103337889A CN2013102595500A CN201310259550A CN103337889A CN 103337889 A CN103337889 A CN 103337889A CN 2013102595500 A CN2013102595500 A CN 2013102595500A CN 201310259550 A CN201310259550 A CN 201310259550A CN 103337889 A CN103337889 A CN 103337889A
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CN
China
Prior art keywords
cell
balancing
voltage
balance module
equalization
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CN2013102595500A
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Chinese (zh)
Inventor
宋海飞
曹亚
张向炜
周长春
邓长吉
常志国
邓思维
刘建鹏
崔占平
王宁
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许继集团有限公司
许继电源有限公司
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Application filed by 许继集团有限公司, 许继电源有限公司 filed Critical 许继集团有限公司
Priority to CN2013102595500A priority Critical patent/CN103337889A/en
Publication of CN103337889A publication Critical patent/CN103337889A/en

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Abstract

The invention relates to a power battery balancing device and method. The device includes balancing modules of battery cells, which are used for the balancing operation of all battery cells, wherein each balancing module is connected in parallel with the corresponding battery cell to form a battery cell charging circuit; all the balancing modules are connected mutually through a CAN bus and are connected to an upper computer through the CAN bus; a DC power supply is connected to the input of each balancing module; a normally open relay is connected in series with an output end of each balancing module. According to the invention, the balancing modules are the same in structure, mutually and independently control the battery cells in a one-to-one correspondence manner, the balancing modules of different amount can be equipped as per the battery packs of different series for balancing, different balancing strategies can be equipped with DC/DC modules in the balancing modules conveniently and flexibly, the balancing requirement of the battery packs of different capacities and nominal voltages of battery cells can be met through setting the balance voltage and balance current, and the balance modules of all the battery cells can be used for balancing simultaneously, thereby saving the balancing time and improving the balancing efficiency.

Description

Power battery pack balancer and method
Technical field
The invention belongs to electric automobile and new forms of energy power battery technology field, relate to a kind of universal power battery pack balancer and method.
Background technology
Face in current global auto industry under the situation of huge challenge of financial crisis and energy environment problem; the development electric automobile; realize the electrification of energy source of car dynamical system, promote the strategic transformation of orthodox car industry, formed extensive common recognition in the world.Electrokinetic cell has played crucial effects as a key technology of electric automobile to the development of whole electric automobile industry.
At present, the main bottleneck that hinders the electrokinetic cell development is power battery management system, it is the automobile power supply that common electrokinetic cell adopts the mode of a plurality of cells series connection, but because each cell is difficult to accomplish monolithic discharging and recharging, therefore cause each cell in the battery pack unbalanced situation to occur discharging and recharging, the phenomenon that undercharge and overdischarge can occur, this situation can cause battery performance sharply to worsen, finally cause the whole Battery pack can't operate as normal, even scrap, thereby influence useful life and the unfailing performance of battery greatly.For guaranteeing the consistency of each monomer in the battery pack, it is carried out equilibrium control be necessary.At present in the domestic existing balancing technique: the problem of concentrating transformer method maximum is that the consistency of secondary output winding is difficult to guarantee, causes equalization deviation easily, and can't remedy; Switching device is many in the switching capacity method, the balanced needs for a long time; But the minimum battery that only is applicable to that capacity is less of dissipation method cost can't adapt to big current balance.
Present stage, electrokinetic cell can be divided into lead-acid battery, nickel-cadmium cell, Ni-MH battery, lithium battery etc. according to the difference of material.The electrokinetic cell of different materials, the monomer whose rated operational voltage is different.Simultaneously, according to the difference of electric automobile vehicle, the electrokinetic cell monomer capacity that disposes, set of monomers string number is also different.At present, also there is not the electrokinetic cell balancer that can be applicable to different materials, different capabilities, not go here and there number on the same group.
Summary of the invention
The purpose of this invention is to provide a kind of electrokinetic cell balancer and method, so that different materials, different capabilities, the electrokinetic cell of number of not going here and there are on the same group carried out equilibrium, solve the problem that existing electrokinetic cell portfolio effect is poor, time for balance is long.
For achieving the above object, the technical scheme of power battery pack balancer of the present invention is as follows: comprise for the balance module that cell is carried out each cell of equalization operation, this balance module is used for and corresponding cell formation in parallel cell charge circuit, between each balance module by the CAN bus interconnection and all be connected in the host computer by the CAN bus, the input of each balance module all inserts a direct current power supply, and the output of each balance module is serially connected with normally opened relay respectively.
Further, described balance module comprises control unit and DC/DC module.
Further; described control unit comprises data acquisition circuit, feedback control circuit, protective circuit and telecommunication circuit; described data acquisition circuit comprises cell voltage collection, output voltage collection and output current Acquisition Circuit; described feedback control circuit comprises Voltage loop and electric current loop dual-loop control circuit, and described protective circuit comprises output overvoltage and output overcurrent protection and alarm circuit thereof.
Power battery pack equalization methods step of the present invention is as follows:
(1) sets equalizing voltage and the euqalizing current of each cell;
(2) host computer is assigned balanced order to each balance module, each balance module judges whether corresponding cell needs to carry out equalization operation, if need carry out equalization operation, corresponding balance module output relay closure is carried out equalization operation according to balance policy to cell;
(3) cell is carried out equalization operation after, after the curtage of collection reached the euqalizing current or magnitude of voltage of setting, the balance module output relay disconnected, this then corresponding joint cell equilibrium is finished;
(4) after each cell equilibrium was finished, corresponding balance module was finished equilibrium by the CAN bus and is given host computer on the information, and after all cell all equilibriums were finished, the equilibrium of host computer prompting whole power battery group was finished.
Further, be that material, capacity, group string number according to each power battery pack arranges the equalizing voltage of each monomer monomer battery and euqalizing current in the described step (1).
Further, the criterion that whether cell needs to carry out equalization operation in the described step (2) is, control unit in the balance module compares the magnitude of voltage of collection and the equalizing voltage of setting, if the voltage of gathering then need not to carry out equalization operation greater than setting equalizing voltage, otherwise then needs to carry out equalization operation.
Further, balance policy comprises constant current charge, constant voltage charge, first constant current constant voltage charge again in the described step (2).
In electrokinetic cell balancer of the present invention and the method, the control one joint cell that each balance module structure is identical and separate, at the realization of the balance module of the configurable different numbers of power battery pack of string is not balanced on the same group, DC/DC module in the balance module can be convenient, flexible the different balance policies of configuration, the DC/DC module can satisfy different capabilities by setting equalizing voltage and euqalizing current simultaneously, the balanced demand of the power battery pack of different monomers rated voltage, the balance module of each cell can carry out equalization operation simultaneously according to the equilibrium order of host computer, reduce time for balance, improved balanced efficient.
Description of drawings
Fig. 1 is the schematic diagram of electrokinetic cell balancer embodiment;
Fig. 2 is the flow chart of electrokinetic cell equalization methods embodiment.
Embodiment
The present invention will be further described in detail below in conjunction with accompanying drawing.
As shown in Figure 1, power battery pack comprises the cell B of n series connection 1, B 2B n, corresponding each cell B n, a balance module U is arranged nIn parallel with it, constitute an independently charge circuit.Balance module U 1With cell B 1Constitute charge circuit 1; U 2With cell B 2Constitute charge circuit 2; U nWith cell B nConstitute charge circuit n; Again by the CAN bus interconnection, by the host computer unified monitoring, the input of each balance module all connects same DC power supply between each balance module, and each balance module output all is equipped with relay, and before balanced order started, relay was in off-state.Balance module comprises control unit and DC/DC module.Control unit comprises data acquisition circuit, feedback control circuit, protective circuit and telecommunication circuit; described data acquisition circuit comprises cell voltage collection, output voltage collection and output current Acquisition Circuit; feedback control circuit comprises Voltage loop and electric current loop dual-loop control circuit, and protective circuit comprises output overvoltage and output overcurrent protection and alarm circuit thereof.The CAN bus mode is adopted in communication.
Power battery pack equalization methods step is as follows:
(1) sets equalizing voltage and the euqalizing current of each cell;
(2) host computer is assigned balanced order to each balance module, each balance module judges whether corresponding cell needs to carry out equalization operation, if need carry out equalization operation, corresponding balance module output relay closure is carried out equalization operation according to balance policy to cell;
(3) cell is carried out equalization operation after, after the curtage of collection reached the euqalizing current or magnitude of voltage of setting, the balance module output relay disconnected, this then corresponding joint cell equilibrium is finished;
(4) after each cell equilibrium was finished, corresponding balance module was finished equilibrium by the CAN bus and is given host computer on the information, and after all cell all equilibriums were finished, the equilibrium of host computer prompting whole power battery group was finished.
Be example with dynamic lithium battery group equalization operation, as Fig. 2, balanced order is assigned to each balance module U by the CAN bus n, each balance module U nIn control unit be responsible for gathering in real time corresponding with it cell B nThe voltage at two ends judges after collection is finished that whether the monomer battery voltage that collects is more than or equal to 3.65V; If more than or equal to 3.65V, show that then this joint cell does not need to carry out equalization operation, this corresponding road balance module is not worked; If cell B nVoltage is less than 3.65V, and corresponding balance module output relay closure is further judged this joint cell B nWhether voltage is less than 3.6V, if this joint cell B nVoltage is less than 3.6V, and then the DC/DC module in the corresponding balance module will be carried out constant current charge to set the cell of current value 10A; If this joint cell B nVoltage is greater than 3.6V, then the DC/DC module in the corresponding balance module will be carried out constant voltage charge with the cell of setting voltage value 3.65V, the constant voltage charge stage, control unit in the balance module detects the size of charging current in real time, if charging current is less than set point 1A, the balance module output relay disconnects, and shows that this joint cell equilibrium of correspondence is finished.After equilibrium was finished, corresponding balance module was finished equilibrium by the CAN bus and is given host computer on the information, and after all cell all equilibriums were finished, the equilibrium of host computer prompting whole power battery group was finished.
The present invention selects suitable balance policy according to the power battery pack classification, disposes high-precision AD and gathers, and can make that all cells fully charge in the power battery pack, and can guarantee balanced consistency.

Claims (7)

1. power battery pack balancer, it is characterized in that: comprise for the balance module that cell is carried out each cell of equalization operation, this balance module is used for and corresponding cell formation in parallel cell charge circuit, between each balance module by the CAN bus interconnection and all be connected in the host computer by the CAN bus, the input of each balance module all inserts a direct current power supply, and the output of each balance module is serially connected with normally opened relay respectively.
2. power battery pack balancer according to claim 1, it is characterized in that: described balance module comprises control unit and DC/DC module.
3. power battery pack balancer according to claim 2; it is characterized in that: described control unit comprises data acquisition circuit, feedback control circuit, protective circuit and telecommunication circuit; described data acquisition circuit comprises cell voltage collection, output voltage collection and output current Acquisition Circuit; described feedback control circuit comprises Voltage loop and electric current loop dual-loop control circuit, and described protective circuit comprises output overvoltage and output overcurrent protection and alarm circuit thereof.
4. the power battery pack equalization methods is characterized in that, the step of this method is as follows:
(1) sets equalizing voltage and the euqalizing current of each cell;
(2) host computer is assigned balanced order to each balance module, each balance module judges whether corresponding cell needs to carry out equalization operation, if need carry out equalization operation, corresponding balance module output relay closure is carried out equalization operation according to balance policy to cell;
(3) cell is carried out equalization operation after, after the curtage of collection reached the euqalizing current or magnitude of voltage of setting, the balance module output relay disconnected, this then corresponding joint cell equilibrium is finished;
(4) after each cell equilibrium was finished, corresponding balance module was finished equilibrium by the CAN bus and is given host computer on the information, and after all cell all equilibriums were finished, the equilibrium of host computer prompting whole power battery group was finished.
5. power battery pack equalization methods according to claim 4 is characterized in that: be that material, capacity, group string number according to each power battery pack arranges the equalizing voltage of each monomer monomer battery and euqalizing current in the described step (1).
6. power battery pack equalization methods according to claim 4, it is characterized in that: the criterion that whether cell needs to carry out equalization operation in the described step (2) is, control unit in the balance module compares the magnitude of voltage of collection and the equalizing voltage of setting, if the voltage of gathering then need not to carry out equalization operation greater than setting equalizing voltage, otherwise then needs to carry out equalization operation.
7. according to each described power battery pack equalization methods among the claim 4-6, it is characterized in that: balance policy comprises constant current charge, constant voltage charge, first constant current constant voltage charge again in the described step (2).
CN2013102595500A 2013-06-26 2013-06-26 Power battery balancing device and method CN103337889A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103560554A (en) * 2013-10-30 2014-02-05 北京海博思创科技有限公司 Electric quantity balancer for battery pack
CN104112877A (en) * 2014-06-25 2014-10-22 许继电气股份有限公司 Lithium battery pack maintenance and performance detection apparatus
CN105223517A (en) * 2015-11-11 2016-01-06 国网黑龙江省电力有限公司绥化供电公司 The online balanced monitoring method of a kind of battery pack
CN106300550A (en) * 2016-09-26 2017-01-04 深圳市清友能源技术有限公司 The equalizing circuit of a kind of lithium battery big electric current of energy transfer type and balance control method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201750186U (en) * 2010-08-13 2011-02-16 烟台东方电子玉麟电气有限公司 Battery pack charging device
CN102355031A (en) * 2011-10-29 2012-02-15 重庆大学 Active equalizing charging method and device for LiFePO4 power battery packs
US20120194133A1 (en) * 2011-01-31 2012-08-02 National Semiconductor Corporation Active cell balancing using independent energy transfer bus for batteries or other power supplies
CN203398816U (en) * 2013-06-26 2014-01-15 许继电气股份有限公司 Power battery group equalization device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201750186U (en) * 2010-08-13 2011-02-16 烟台东方电子玉麟电气有限公司 Battery pack charging device
US20120194133A1 (en) * 2011-01-31 2012-08-02 National Semiconductor Corporation Active cell balancing using independent energy transfer bus for batteries or other power supplies
CN102355031A (en) * 2011-10-29 2012-02-15 重庆大学 Active equalizing charging method and device for LiFePO4 power battery packs
CN203398816U (en) * 2013-06-26 2014-01-15 许继电气股份有限公司 Power battery group equalization device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103560554A (en) * 2013-10-30 2014-02-05 北京海博思创科技有限公司 Electric quantity balancer for battery pack
CN103560554B (en) * 2013-10-30 2016-03-30 北京海博思创科技有限公司 Electric quantity balancer for battery pack
CN104112877A (en) * 2014-06-25 2014-10-22 许继电气股份有限公司 Lithium battery pack maintenance and performance detection apparatus
CN105223517A (en) * 2015-11-11 2016-01-06 国网黑龙江省电力有限公司绥化供电公司 The online balanced monitoring method of a kind of battery pack
CN106300550A (en) * 2016-09-26 2017-01-04 深圳市清友能源技术有限公司 The equalizing circuit of a kind of lithium battery big electric current of energy transfer type and balance control method

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