CN102044718A - Power lithium iron phosphate battery pack management system for electric automobiles and working method of system - Google Patents

Power lithium iron phosphate battery pack management system for electric automobiles and working method of system Download PDF

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Publication number
CN102044718A
CN102044718A CN2009101970235A CN200910197023A CN102044718A CN 102044718 A CN102044718 A CN 102044718A CN 2009101970235 A CN2009101970235 A CN 2009101970235A CN 200910197023 A CN200910197023 A CN 200910197023A CN 102044718 A CN102044718 A CN 102044718A
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China
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management
power
voltage
circuit
voltage connector
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CN2009101970235A
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Chinese (zh)
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蒋新华
刘勇
那伟
周钦哲
解晶莹
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上海空间电源研究所
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Priority to CN2009101970235A priority Critical patent/CN102044718A/en
Publication of CN102044718A publication Critical patent/CN102044718A/en

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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The invention belongs to the field of battery pack management systems, and aims to provide a power lithium iron phosphate battery pack management system for electric automobiles and a working method of the system. The invention is characterized in that all lithium iron phosphate batteries forming the battery pack are uniformly divided into a plurality of battery sub-packs; each module management device (1) is connected with one battery sub-pack to acquire voltage and temperature signals of the battery sub-pack, and communicates with a general management device (2) through a controller area network (CAN); and the general management device (2) controls the on-off state of a positive terminal power high-voltage contactor (3), a negative terminal power high-voltage contactor (4), precharging high-voltage contactors (6 and 7) and a charging high-voltage contactor (8), and the operation of a temperature control system fan (9). In the invention, the problem in managing the power lithium iron phosphate battery pack for electric automobiles is solved, the high-voltage safety of the battery pack is ensured and the service life of the battery pack is prolonged.

Description

Used for electric vehicle power ferric phosphate lithium cell group management system and method for work thereof
Technical field
The invention belongs to the batteries management system field.Be specifically related to the management system and the method for work thereof of used for electric vehicle power ferric phosphate lithium cell group.
Technical background
The lithium ion battery group is used more and more widely, progressively is applied to electric bicycle, electric automobile, large-scale energy storage system etc., and lithium ion battery group management system and method for work thereof are one of several key technologies that influence the extensive use of lithium ion battery group.New system power ferric phosphate lithium cell group has the advantage that security performance is good, have extended cycle life, and has promoted the development of ev industry.Yet several years ago the research of constituent parts and scientific research institutions all is the power battery pack of lithium cobalt oxygen system, lithium manganese oxygen system and ternary system, disclose a kind of batteries management system and method for work thereof as patent [publication number: CN 101039034A], feature is that it is made of data processing unit, charging balance adjustment performance element, discharge control execution unit, battery status sampling unit, system's power supply identification reference cell, charged state indicating member.The management system function that is adopted is simple, does not adopt modular structure, does not have the application prospect of industrialization.The patent of universal group [patent No.: ZL 200720113611.2] discloses a kind of utility model of lithium ion battery group management system, also by several equalizing circuits, several multichannel cell voltage monitoring chips and the single machine unit that links to each other by bus with all multichannel cell voltage monitoring chip, there is defective in this management system aspect the high-voltage safety control, and Functions of Management System is simple.
Power ferric phosphate lithium cell group is a kind of novel batteries, the difference of it and traditional lithium ion battery group is that platform identity is good, voltage differences is little under the different state-of-charges, just no longer suitable because of the method that has caused present management system to be controlled according to voltage in this, restricted the development of electric vehicle engineering.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of used for electric vehicle power ferric phosphate lithium cell group management system and method for work thereof, it is a kind of management system and method for work at power ferric phosphate lithium cell group, the energy flexible expansion, guaranteed the high-voltage safety of battery pack, effectively bring into play the characteristic of battery pack simultaneously, have huge industrial application prospect.
The technical scheme that technical solution problem of the present invention is adopted is:
Used for electric vehicle power ferric phosphate lithium cell group management system, described battery pack is in series by the more piece ferric phosphate lithium cell, it is characterized in that: described management system comprises anode power high voltage connector 3, negative terminal power high voltage connector 4, pre-charge resistance 5, precharge high voltage connector 6 and 7, charging high voltage connector 8, temperature control system fan 9; Described management system also comprises several module management devices 1, a configuration management device 2; All ferric phosphate lithium cells of described composition battery pack are divided into several battery group; Each module management device 1 links to each other with each battery group with voltage, the temperature signal of collection battery group, and by CAN network and configuration management device 2 interactive information; Configuration management device 2 control anode power high voltage connectors 3, negative terminal power high voltage connector 4, precharge high voltage connector 6 and 7, the break-make of charging high voltage connector 8 and the work of temperature control system fan 9.
There are two circuit parallel with one another between the positive pole of described battery pack and the power output cathode, article one, be directly to connect the power output cathode by anode power high voltage connector 3, another is to connect the power output cathode by pre-charge resistance 5 series connection precharge high voltage connectors 6; Also there are two circuit parallel with one another between the positive pole of described battery pack and the charger output cathode, article one, be directly to connect the charger output cathode by charging high voltage connector 8, another is to connect the charger output cathode by pre-charge resistance 5 series connection precharge high voltage connectors 7; The negative pole of described battery pack connects power output negative pole and charger output negative pole by negative terminal power high voltage connector 4.
Described module management device 1, mainly form by voltage detecting circuit 11, balancing control circuit 12, temperature sensing circuit 13, CAN communicating circuit 15, CPU14, CAN communicating circuit 15 and power module 16, wherein voltage detecting circuit 11 links to each other with battery group, balancing control circuit 12 links to each other with battery group, temperature sensing circuit 13 links to each other with temperature sensor by lead-in wire, and temperature sensor is affixed on the battery group surface; CPU14 links to each other with voltage detecting circuit 11, balancing control circuit 12, temperature sensing circuit 13, CAN communicating circuit 15 and power module 16; CAN communicating circuit 15 links to each other with configuration management device 2 by lead-in wire.
The power supply of module management device 1 is by 2 controls of configuration management device, and power module 16 links to each other with configuration management device 2 by lead-in wire.Power module 16 is the insulating power supply module.
Described configuration management device 2 comprises CPU21, fan control circuitry 22, voltage detecting circuit 23, temperature sensing circuit 24, CAN communicating circuit 25, modular power source control circuit 26, insulation resistance testing circuit 27, current detection circuit 28, high-voltage safety testing circuit 29, CAN communicating circuit 30 and high voltage connector control circuit 31; Wherein CPU21 links to each other with other each circuit in the configuration management device 2; Temperature sensing circuit 24 links to each other with temperature sensor by lead-in wire, is used to detect the intake air temperature and the air outlet temperature of power-supply system; Two CAN communicating circuits of described configuration management device, one links to each other with module management device 1, and another one links to each other with external device (ED) 10.
High-voltage safety testing circuit 29 is the testing circuit of the safe condition of the high-pressure installation that can monitor battery pack in real time.
Used for electric vehicle power ferric phosphate lithium cell group management system method of work, it may further comprise the steps:
Step 1, configuration management device 2 power on;
Step 2, configuration management device 2 carry out self check, and to 1 power supply of module management device; Carry out the CAN communication with configuration management device 2 behind module management device 1 power-on self-test;
Do you step 3, judge whether self check normal? not, then change fault mode over to, be, then enter wait state, behind external charging equipment or load equipment connecting system, start the enable signal of charging or discharge;
Step 4, when external device (ED) sends charging or discharge enable signal, enter pre-charge state, promptly open battery pack negative terminal power high voltage connector 4 and carry out precharge with corresponding precharge high voltage connector 6 and 7, judge whether precharge successful?, then do not enter malfunction; Be, then enter normal operating conditions, promptly close precharge high voltage connector 6 and 7, open corresponding anode power high voltage connector 3 or charging high voltage connector 8; Enter charging or discharge condition;
Step 5, the charging or discharge process in, voltage, temperature, electric current and the insulation resistance of module management device 1 and configuration management device 2 timing acquiring battery group, when battery failure occurring, configuration management device 2 will disconnect negative terminal power high voltage connector 4 and anode power high voltage connector 3; When monomer voltage difference in the battery pack reached certain value, module management device 1 started balancing control circuit 12.
In the described step 2, configuration management device 2 is checked by module management device 1 pair of each monomer battery voltage, temperature, and total system insulation resistance, high-voltage safety control circuit is checked when carrying out System self-test; Can be after all normal by the self check state.
In the described step 4, configuration management device 2 receives charging or discharge during enable signal, at first opens corresponding precharge high voltage connector 6 and 7 and negative terminal power high voltage connector 4, carries out precharge; When load bus voltage reaches the assigned voltage value, close precharge high voltage connector 6 and 7 within a certain period of time, open charging high voltage connector 8 or anode power high voltage connector 3, enter into normal mode of operation.
The invention has the beneficial effects as follows: solved the problem of management of used for electric vehicle power ferric phosphate lithium cell group, guaranteed the high-voltage safety of battery pack, the useful life of having improved battery pack.
Batteries management system and method for work thereof that the present invention adopts are a kind of management system and method for works at power ferric phosphate lithium cell group, can improve the security performance of battery pack, prolong the useful life of battery pack.
Description of drawings
Fig. 1 is a used for electric vehicle power ferric phosphate lithium cell group management system theory diagram.
Fig. 2 is a module management principle of device block diagram.
Fig. 3 is a configuration management principle of device block diagram.
Fig. 4 is a batteries management system method of work flow chart.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in further detail.
Present embodiment is a used for electric vehicle power ferric phosphate lithium cell group, battery pack claims the ferric phosphate lithium cell of 3.2V20Ah to be in series by 108 feast-brand marks, have 9 module management devices, each module management device management 12 string battery pack, the battery pack maximum charging current is 150A, and maximum discharge current is 200A.Fan adopts the 12V power supply, and the power high voltage connector adopts the contactor of 600V500A, and precharge contactor and charging high voltage connector adopt the contactor of 600V10A, and pre-charge resistance adopts the high-power resistance of 200W10.
Execution mode is as follows, in conjunction with referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4:
As shown in Figure 1, a kind of used for electric vehicle power ferric phosphate lithium cell group management system, comprise 1,1 configuration management device 2 of 9 module management devices, anode power high voltage connector 3, negative terminal power high voltage connector 4, pre-charge resistance 5, precharge high voltage connector 6 and 7, charging high voltage connector 8, temperature control system fan 9 are formed.Described module management device 1 links to each other with battery group, gathers voltage, the temperature signal of battery group module, and by CAN network and configuration management device 2 interactive information.Configuration management device 2 control anode power high voltage connectors 3, negative terminal power high voltage connector 4, precharge high voltage connector 6 and 7, the break-make of charging high voltage connector 8 and the work of temperature control system fan 9.
As shown in Figure 2, module management device 1 is made up of voltage detecting circuit 11, balancing control circuit 12, temperature sensing circuit 13, CPU14, CAN communicating circuit 15, power module 16.Wherein CPU14 generally adopts the DSP device, and integrated 16 road A/D sampling channels can be gathered 12 road voltages and 4 tunnel temperature simultaneously, and voltage detecting circuit 11 links to each other with battery group by lead-in wire, and balancing control circuit 12 also links to each other with battery group.Temperature sensing circuit links to each other with temperature sensor by lead-in wire, and temperature sensor is affixed on the battery group surface, and temperature sensing circuit adopts negative tempperature coefficient thermistor as temperature sensor, carries out temperature detection by the mode of electric resistance partial pressure.Power module 16 links to each other with configuration management device 2 by lead-in wire with CAN communicating circuit 15.The power supply of module management device 1 is 2 controls of configuration management device, can disconnect the power supply of module management device 1 as required.The current source type circuit that voltage detecting circuit 11 has adopted amplifier and field effect transistor to form, balancing control circuit 12 have adopted the mode of field effect transistor and high-power resistance series connection to realize.The CAN communicating circuit adopts the isolated form drive circuit.
As shown in Figure 3, configuration management device 2 is made up of CPU21, fan control circuitry 22, voltage detecting circuit 23, temperature sensing circuit 24, CAN communicating circuit 25, modular power source control circuit 26, insulation resistance testing circuit 27, current detection circuit 28, high-voltage safety testing circuit 29, CAN communicating circuit 30, high voltage connector control circuit 31.Wherein CPU21 generally adopts the DSP device, and voltage detecting circuit 23 is the high-voltage detecting circuit that amplifier and divider resistance are formed.The temperature detection that temperature sensing circuit 24 needs for temperature control system adopts the mode of thermistor to realize, current detection circuit 28 adopts Hall current sensor, and insulation resistance testing circuit 27 adopts the test of three voltage methods.High-voltage safety testing circuit 29 adopts current source circuit to detect, and the CAN communicating circuit adopts the isolated form drive circuit, the mode that high voltage connector control circuit 31 adopts the relay twin-stage to drive.
Fan control circuitry 22 adopts MOSFET to control, and recently controls the rotating speed of fan according to the conducting duty of MOSFET.Voltage detecting circuit 23 is a high-voltage detecting circuit, and voltage detecting circuit 23 adopts differential amplifier circuit to realize.Temperature sensing circuit 24 links to each other with temperature sensor by lead-in wire, is used to detect the intake air temperature and the air outlet temperature of power-supply system.CAN communicating circuit 25 is configuration management device 2 and module management device 1 interactive information.Modular power source control circuit 26 has added control switch, is used for control to 1 power supply of module management device.Insulation resistance testing circuit 27 is used to detect the insulation situation between battery pack and the system control ground, employing be the mode that three voltage methods detect.Current detection circuit 28 detects the charging and discharging currents of whole battery group, and high-voltage safety testing circuit 29 is used to detect the connection situation of high-pressure installation, to guarantee the high-voltage safety of battery pack.CAN communicating circuit 30 is used for configuration management device 2 and carries out interactive information with external device (ED) 10.High voltage connector control circuit 31 is a relay drive circuit, is used to drive the external high pressure contactor.
As shown in Figure 4, be the method for work flow chart of batteries management system, configuration management device 2 has following operating state: initialization self check state, wait enabled state, pre-charge state, normal operating conditions and fault mode state.
(1) behind external charging equipment or the load equipment connecting system, can start charging or discharge enable signal;
(2) configuration management device 2 powers on, and carries out self checks such as voltage, electric current, insulation resistance, high-voltage safety state, and to 1 power supply of module management device;
(3) carry out the CAN communication with configuration management device 2 behind module management device 1 power-on self-test;
(4) the normal back configuration management of self check device 2 enters the wait enabled state;
(5) when external device (ED) sends charging or discharge enable command, enter pre-charge state, open battery pack negative terminal power high voltage connector 4 and corresponding precharge high voltage connector 6 and 7, close precharge high voltage connector 6 and 7 after the precharge success, open corresponding anode power contactor 3 or charging high voltage connector 8.Entering normal operating conditions promptly charges or discharge condition;
(6) in charging or discharge process, voltage, temperature, electric current and the insulation resistance of module management device 1 and configuration management device 2 timing acquiring battery pack, when battery failure occurring, configuration management device 2 will disconnect two power high voltage connectors.When monomer voltage difference in the battery pack reached certain value, module management device 1 started balancing control circuit 12.
Above-mentioned configuration management device 2 carries out early warning to all faults of battery pack and management system in the course of the work, can enter into fault mode from arbitrary patterns when catastrophe failure takes place.
Above-mentioned configuration management device 2 needed to insert outside 12V Vehicular accumulator cell before powering on, control the power supply supply of configuration management device 2 again by charging or discharge signal.
Above-mentioned configuration management device 2 can enter initialization self check state before operate as normal, at first open the power supply of module management device 1 when entering the self check state, set up the CAN communication, each monomer voltage, temperature to battery module are carried out self check, and simultaneously voltage, electric current, intake air temperature, air outlet temperature, insulation resistance and the high-voltage safety unit state of configuration management device 2 are checked, can jump out the self check state after all normal.
The balanced control mode of above-mentioned batteries management system is as follows: when module management device 1 is implemented balanced control, need send and balanced action to indicate by configuration management device 2, and configuration management device 2 be only when just sending under the situation that does not have discharging action behind the parking of automobile or in the use external charger charging process and can balanced action marking attitude.
Every 20ms electric current and total voltage are once sampled in above-mentioned configuration management device 2 course of normal operation, current sample is used for the residual capacity of counting cell group.
Above-mentioned is preferred embodiment of the present invention, and the non-limiting right of applying for a patent of the present invention; Simultaneously above description can be understood and be implemented the special personage who knows the present technique field, so other does not break away from the equivalence of being finished under the disclosed spirit and change or modification, all should be included in the above-mentioned claim.

Claims (9)

1. used for electric vehicle power ferric phosphate lithium cell group management system, described battery pack is in series by the more piece ferric phosphate lithium cell, it is characterized in that: described management system comprises anode power high voltage connector (3), negative terminal power high voltage connector (4), pre-charge resistance (5), precharge high voltage connector (6) and (7), charging high voltage connector (8), temperature control system fan (9); Described management system also comprises several module management devices (1), a configuration management device (2); All ferric phosphate lithium cells of described composition battery pack are divided into several battery group; Each module management device (1) links to each other with each battery group with voltage, the temperature signal of collection battery group, and by CAN network and configuration management device (2) interactive information; Configuration management device (2) control anode power high voltage connector (3), negative terminal power high voltage connector (4), precharge high voltage connector (6) and (7), the break-make of charging high voltage connector (8) and the work of temperature control system fan (9).
2. according to the described used for electric vehicle power of claim 1 ferric phosphate lithium cell group management system, it is characterized in that: have two circuit parallel with one another between the positive pole of described battery pack and the power output cathode, article one, be directly to connect the power output cathode by anode power high voltage connector (3), another is to connect the power output cathode by pre-charge resistance (5) series connection precharge high voltage connector (6); Also there are two circuit parallel with one another between the positive pole of described battery pack and the charger output cathode, article one, be directly to connect the charger output cathode by high voltage connector (8), another is to connect the charger output cathode by pre-charge resistance (5) series connection precharge high voltage connector (7); The negative pole of described battery pack connects power output negative pole and charger output negative pole by negative terminal power high voltage connector (4).
3. according to the described used for electric vehicle power of claim 1 ferric phosphate lithium cell group management system, it is characterized in that: described module management device (1), mainly form by voltage detecting circuit (11), balancing control circuit (12), temperature sensing circuit (13), CPU (14), CAN communicating circuit (15) and power module (16), wherein voltage detecting circuit (11) links to each other with battery group, balancing control circuit (12) links to each other with battery group, temperature sensing circuit (13) links to each other with temperature sensor by lead-in wire, and temperature sensor is affixed on the battery group surface; CPU (14) links to each other with voltage detecting circuit (11), balancing control circuit (12), temperature sensing circuit (13), CAN communicating circuit (15) and power module (16); CAN communicating circuit (15) links to each other with configuration management device (2) by lead-in wire.
4. according to the described used for electric vehicle power of claim 3 ferric phosphate lithium cell group management system, it is characterized in that: the power supply of module management device (1) is by configuration management device (2) control, and power module (16) links to each other with configuration management device (2) by lead-in wire; Power module (16) is the insulating power supply module.
5. according to the described used for electric vehicle power of claim 1 ferric phosphate lithium cell group management system, it is characterized in that: described configuration management device (2) comprises CPU (21), fan control circuitry (22), voltage detecting circuit (23), temperature sensing circuit (24), CAN communicating circuit (25), modular power source control circuit (26), insulation resistance testing circuit (27), current detection circuit (28), high-voltage safety testing circuit (29), CAN communicating circuit (30) and high voltage connector control circuit (31); Wherein CPU (21) links to each other with other each circuit in the configuration management device (2); Temperature sensing circuit (24) links to each other with temperature sensor by lead-in wire, is used to detect the intake air temperature and the air outlet temperature of power-supply system; Two CAN communicating circuits of described configuration management device, one links to each other with module management device (1), and another one links to each other with external control device (10).
6. according to the described used for electric vehicle power of claim 5 ferric phosphate lithium cell group management system, it is characterized in that: high-voltage safety testing circuit (29) is the testing circuit of safe condition of the high-pressure installation that can monitor battery pack in real time.
7. used for electric vehicle power ferric phosphate lithium cell group management system method of work, it may further comprise the steps:
Step 1, configuration management device (2) power on;
Step 2, configuration management device (2) carry out self check, and power to module management device (1); Behind module management device (1) power-on self-test with configuration management device (2) CAN communication;
Do you step 3, judge whether self check normal? not, then change fault mode over to, be, then enter wait state, behind external charging equipment or load equipment connecting system, start the enable signal of charging or discharge;
Step 4, when external device (ED) sends charging or discharge enable signal, enter pre-charge state, promptly open battery pack negative terminal power high voltage connector (4) and corresponding precharge high voltage connector (6) and (7) and carry out precharge, judge whether precharge successful?, then do not enter malfunction; Be, then enter normal operating conditions, promptly close precharge high voltage connector (6) and (7), open corresponding anode power high voltage connector (3) or charging high voltage connector (8); Enter charging or discharge condition;
Step 5, the charging or discharge process in, voltage, temperature, electric current and the insulation resistance of module management device (1) and configuration management device (2) timing acquiring battery group, when battery failure occurring, configuration management device (2) will disconnect negative terminal power high voltage connector (4) and anode power high voltage connector (3); When monomer voltage difference in the battery pack reached certain value, module management device (1) started balancing control circuit (12).
8. according to the described used for electric vehicle power of claim 7 ferric phosphate lithium cell group management system method of work, it is characterized in that: in the described step 2, configuration management device (2) is when carrying out System self-test, by module management device (1) each monomer battery voltage, temperature are checked, and total system insulation resistance, high-voltage safety control circuit are checked; Can be after all normal by the self check state.
9. according to the described used for electric vehicle power of claim 7 ferric phosphate lithium cell group management system method of work, it is characterized in that: in the described step 4, when configuration management device (2) receives charging or discharge enable signal, at first open corresponding precharge high voltage connector (6) and (7) and negative terminal power high voltage connector (4), carry out precharge; When load bus voltage reaches the assigned voltage value, close precharge high voltage connector (6) and (7) within a certain period of time, open charging high voltage connector (8) or anode power high voltage connector (3), enter into normal mode of operation.
CN2009101970235A 2009-10-13 2009-10-13 Power lithium iron phosphate battery pack management system for electric automobiles and working method of system CN102044718A (en)

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CN105244953A (en) * 2015-10-19 2016-01-13 金龙联合汽车工业(苏州)有限公司 Pre-charging system for electrical vehicle and pre-charging control method
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CN105576304A (en) * 2016-02-29 2016-05-11 中国人民解放军武汉军械士官学校 Battery pack management system and battery pack management method
CN107147153A (en) * 2016-03-01 2017-09-08 财团法人工业技术研究院 Battery management system and apply its battery system
CN107147153B (en) * 2016-03-01 2021-01-26 财团法人工业技术研究院 Battery management system and battery system using same
CN107478888A (en) * 2016-06-20 2017-12-15 宝沃汽车(中国)有限公司 The calibration method and system of battery power feeds voltage
CN107478888B (en) * 2016-06-20 2019-09-20 宝沃汽车(中国)有限公司 The calibration method and system of battery power feeds voltage
CN107181017A (en) * 2017-04-24 2017-09-19 北京长城华冠汽车科技股份有限公司 A kind of electric automobile power battery temperature control system and method
CN107271859A (en) * 2017-05-27 2017-10-20 上海电机学院 A kind of improved electric automobile power cell Insulation Inspection System and method
CN107887660A (en) * 2017-10-18 2018-04-06 湖北美洋汽车工业有限公司 A kind of automatic adjusument electrokinetic cell system
CN107918046A (en) * 2017-10-23 2018-04-17 宁德时代新能源科技股份有限公司 Current sensing means and battery management system
US10718797B2 (en) 2017-10-23 2020-07-21 Contemporary Amperex Technology Co., Limited Current detecting apparatus and battery management system
CN109649213A (en) * 2018-11-22 2019-04-19 西安电子科技大学芜湖研究院 A kind of open cell Distribution Management System
CN110098734A (en) * 2019-05-15 2019-08-06 广东省华虎新能源科技有限公司 A kind of voltage method for transformation for ferric phosphate lithium cell group
CN110098734B (en) * 2019-05-15 2021-01-29 广东省华虎新能源科技有限公司 Voltage conversion method for lithium iron phosphate battery pack

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