CN103715722A - Power battery pack equalization maintenance system and method - Google Patents

Power battery pack equalization maintenance system and method Download PDF

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CN103715722A
CN103715722A CN201210370522.1A CN201210370522A CN103715722A CN 103715722 A CN103715722 A CN 103715722A CN 201210370522 A CN201210370522 A CN 201210370522A CN 103715722 A CN103715722 A CN 103715722A
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battery pack
cell
current
voltage
charging device
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CN103715722B (en
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毛广甫
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Shenzhen Ruinong Innovation Technology Co ltd
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Abstract

The invention belongs to the field of power battery pack equalization maintenance and provides a power battery equalization maintenance system and a power battery equalization maintenance method. The system includes a data processing unit, a control unit connected with the data processing unit, a battery pack charging and discharging device, and N single body battery charging devices; a charging and discharging end of the battery pack charging and discharging device is connected with a battery pack, and a communication end of the battery pack charging and discharging device is connected with the control unit; the battery pack charging and discharging device is used for charging and discharging the battery pack and acquiring voltage values and current values at two ends of the battery pack; a charging and discharging end of each single body battery charging device is connected in parallel with two ends of a single body battery; a communication end of each single body battery charging device is connected with the control unit; and each single body battery charging device is used for charging one single body battery and acquiring voltage values and current values of two ends of the single body battery. With the power battery pack equalization maintenance system and method provided by the invention adopted, equalization maintenance on the battery pack can be accomplished quickly, and at the same time, an effect after the maintenance can be more stable.

Description

A kind of power battery pack equalized maintenance system and method
Technical field
The present invention relates to the equalized maintenance field of power battery pack, relate in particular to a kind of power battery pack equalized maintenance system and method.
Background technology
At present, along with new forms of energy are at the outstanding advantage aspect energy-conserving and environment-protective, energy-accumulating power station, electric automobile, medical treatment and industrial relevant device are generally used battery as energy storage device.Because the voltage of cell cannot reach power demands, therefore generally cell being together in series forms series battery and uses.
The raw material that adopted during fabrication due to cell and the difference of technique are difficult to guarantee the many reasons such as inconsistent of temperature in use of the consistency of parameters of cell or cell and degree of aging, thereby cause the inconsistent of the charging capacity of the cell in series battery or discharge capacity, cause the capacity of cell and voltage inconsistent.
The inconsistent normal use that will affect battery pack of the capacity of the cell in series battery and voltage, when serious, will damage cause the damage of cell even to burn, the dangerous situation such as blast.
The capacity and the inconsistent problem of voltage that in use occur for the cell solving in series battery, prior art provides the equalized maintenance technology of some power battery pack, but the problem such as the equalized maintenance technology of the power battery pack that prior art provides exists the overlong time expending while carrying out equalized maintenance and the effect after equalized maintenance is unstable.
Summary of the invention
The problems such as the object of the embodiment of the present invention is to provide a kind of power battery pack equalized maintenance system and method, and the overlong time expending, portfolio effect when the equalized maintenance technology that is intended to solve the power battery pack providing in prior art exists and to carry out equalized maintenance unstable and service time is of short duration.
The embodiment of the present invention is achieved in that a kind of power battery pack equalized maintenance system, is connected with the battery pack being composed in series by N cell, comprising: data processing unit; The control unit being connected with described data processing unit; Battery set charge/discharge equipment, its charge-discharge end is connected with described battery pack, and communication terminal is connected with described control unit, and power end is for being connected with AC power; Described battery set charge/discharge equipment is for discharging and recharging and gather magnitude of voltage and the current value at described battery pack two ends to battery pack; And N cell charging device, the charge-discharge end of each cell charging device is connected in the two ends of a cell in parallel, the communication terminal of each cell charging device is connected with described control unit, and power end is for being connected with AC power; Each cell charging device is for charging to a cell and gathering magnitude of voltage and the current value at cell two ends; Described N is more than or equal to 2 and be less than or equal to 500 positive integer; During work, control unit feeds back to described data processing unit by magnitude of voltage and the current value at the magnitude of voltage at described battery pack two ends and current value and each cell two ends; Described data processing unit compares the magnitude of voltage receiving and current value and default threshold value send instruction according to comparative result; Described control unit according to described instruction output control described battery set charge/discharge equipment to the charging current of described battery pack and described cell charging device the charging current to cell, make each cell equalizing charge.
Further, described battery set charge/discharge equipment is connected with described data processing unit by the communication bus of CAN bus or RS232 or RS485 formation.
Further, described N cell charging device is connected with described data processing unit by the communication bus consisting of CAN bus or RS232 or RS485 respectively.
The present invention also provides a kind of power battery pack equalized maintenance method of the power battery pack equalized maintenance system based on above-mentioned, comprises the following steps:
S1: charge step:
S11: described battery set charge/discharge equipment carries out constant current charge with the maximum rated current of described cell to described battery pack;
S12: in the time of with described step S11, described cell charging device carries out constant current charge with its maximum output current to described cell;
S2: judge and whether have the magnitude of voltage of a cell to surpass the first voltage threshold in described battery pack; If so, enter step S3, if not, be back to step S11;
S3: the charging current of described battery set charge/discharge equipment is adjusted into m/mono-of described maximum rated current, described m is more than or equal to 2 positive integer;
S4: whether the charging current of the described battery set charge/discharge equipment in determining step S3 after adjusting is the first current threshold, and if so, described battery set charge/discharge equipment quits work, and if not, is back to step S2;
S5: whether the voltage capacity value that judges each cell reaches the first voltage threshold, if so, enters step S6, if not, is back to step S12;
S6: described cell charging device charges to described cell in constant voltage mode;
S7: judge whether cell electric current is reduced to the second current threshold, and if so, cell charging device quits work; If not, be back to step S6.
Further, in step S12, the maximum output current of described cell charging device is set according to the type of battery pack and customer requirement.
Further, the maximum rated voltage that described the first voltage threshold is cell; Described the first voltage threshold is set according to the type of battery pack and customer requirement.
Further, the lower threshold that described the first current threshold is the charging current of described battery set charge/discharge equipment; Described the first current threshold is zero to the arbitrary numerical value between the maximum output current of described cell charging device.
Further, described the second current threshold is set according to the type of battery pack and customer requirement.
Power battery pack equalized maintenance system provided by the invention and method, wherein this equalized maintenance system comprises the battery set charge/discharge equipment for battery pack is discharged and recharged, for a plurality of cell charging devices that a plurality of cells charged and detect respectively a plurality of monomer battery voltages respectively, for controlling the control appliance of described battery set charge/discharge equipment and cell charging device; First this equalized maintenance method be take the maximum rated current of cell by battery set charge/discharge equipment and cell charging device and is carried out constant current charge as cell charging, when reaching maximum rated voltage, cell progressively reduces the charging current of battery set charge/discharge equipment, further, cell charging device corresponding to cell that reaches maximum rated voltage transfers constant voltage charge to by constant current charge, until when all the magnitude of voltage of cells all remains on maximum rated voltage, finish equalized maintenance.Compared with prior art, power battery pack equalized maintenance system provided by the invention and method, can complete the equalized maintenance to battery pack fast, and the effect after simultaneously safeguarding is more stable.
Accompanying drawing explanation
The theory diagram of the power battery pack equalized maintenance system that Fig. 1 provides for the embodiment of the present invention;
The flow chart of the power battery pack equalized maintenance method that Fig. 2 provides for the embodiment of the present invention.
Embodiment
For making object of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and specific embodiment, the invention will be further described.Should be appreciated that specific embodiment described herein, only for explaining the present invention, is not limited to the present invention.
With reference to Fig. 1, the theory diagram of the power battery pack equalized maintenance system that the embodiment of the present invention provides, for convenience of explanation, only shows the part relevant to the embodiment of the present invention, and details are as follows:
Power battery pack equalized maintenance system is connected with the battery pack 5 being composed in series by N cell 51, and power battery pack equalized maintenance system comprises: battery set charge/discharge equipment 2, a N cell charging device 3 and computer 4; Its Computer 4 comprises control unit 41 and data processing unit 42; The charge-discharge end of battery set charge/discharge equipment 2 is connected with described battery pack, and the communication terminal of battery set charge/discharge equipment 2 is connected with described control unit, and the power end of battery set charge/discharge equipment 2 is for being connected with AC power 1; Battery set charge/discharge equipment 2 is for discharging and recharging and gather magnitude of voltage and the current value at battery pack 5 two ends to battery pack 5; In N cell charging device 3, the charge-discharge end of each cell charging device 3 is connected in the two ends of a cell 51 in parallel, the communication terminal of each cell charging device 3 is connected with control unit 41, and the power end of each cell charging device 3 is for being connected with AC power 1; Each cell charging device 3 is for charging to a cell 51 and gathering magnitude of voltage and the current value at cell 51 two ends; N is more than or equal to 2 and be less than or equal to 500 positive integer; During work, control unit 41 feeds back to data processing unit 42 by magnitude of voltage and the current value at the magnitude of voltage at battery pack 5 two ends and current value and each cell 51 two ends; Data processing unit 42 compares the magnitude of voltage receiving and current value and default threshold value send instruction according to comparative result; Control unit 41 is controlled the charging current of 2 pairs of battery pack 5 of battery set charge/discharge equipment and the charging current of 3 pairs of cells 51 of cell charging device according to instruction output, makes each cell 51 equalizing charge.
Wherein, default threshold value comprises: the lower threshold of the charging current of the maximum rated voltage of cell, maximum rated current, minimum discharge voltage, maximum differential pressure and described battery set charge/discharge equipment.
In embodiments of the present invention, battery set charge/discharge equipment 2 is the equipment that independently can discharge and recharge, by discharging and recharging master port, battery pack integral body is discharged and recharged, power supply meets alternating current 220V/380V, battery set charge/discharge equipment 2 is provided with PORT COM simultaneously, and the communication bus consisting of CAN bus/RS232/RS485 is realized the communication with computer.N cell charging device 3 is independently connected to respectively the two ends of each cell 51, by charge balancing port, cell is charged, power supply 1 connects alternating current 220V/380V be provided with PORT COM the same as battery set charge/discharge equipment 2, and the communication bus consisting of CAN bus/RS232/RS485 is realized the communication with computer.Communication bus to control unit 41, by CAN bus/RS485/RS232 carries out communication between control unit 41 and computer by the communication collecting from cell charging device 3.
In embodiments of the present invention, battery set charge/discharge equipment 2 is responsible for charging simultaneously or discharging to the battery pack 5 of series connection, and adopts information of voltage and the current information at set battery Group 5 two ends; Cell charging device 3 is responsible for carrying out the energy management of charging and discharging to each cell 51 in the battery of series connection, and gather information of voltage and the current information at cell 51 two ends, each cell charging device 3 is with four electrode form (V+V-I+I-, two of V+V-are for sampled voltage information, and two of I+I-are for current-sharing) output is connected to the two ends of battery.Battery set charge/discharge equipment 2 obtains the voltage of each cell 51 by CAN bus, or by cell charging device 3 communication buses, obtain the voltage of each cell 51, calculate and obtain mode and the needed current/voltage numerical value discharging and recharging, each monomer balancer also detects data by communication bus or the electric current and voltage of self, confirms the balanced way of each cell and balance policy.The instruction that the main responsible receiving computer of control unit 41 sends, simultaneously by the module information feedback and the computer that read, computer is the processing of docking collection of letters breath and sending of instruction.
The theory diagram of the power battery pack equalized maintenance system providing below in conjunction with Fig. 1 embodiment of the present invention, the flow chart of the power battery pack equalized maintenance method providing with reference to Fig. 2 embodiment of the present invention, the power battery pack equalized maintenance method that the embodiment of the present invention is provided is described further.
A power battery pack equalized maintenance method based on above-described power battery pack equalized maintenance system, carries out equalized maintenance for the battery pack 5 to being comprised of a plurality of cells 51, and power battery pack equalized maintenance method comprises the following steps:
S1: charge step:
S11: described battery set charge/discharge equipment carries out constant current charge with the maximum rated current of described cell to described battery pack;
S12: in the time of with described step S11, described cell charging device carries out constant current charge with its maximum output current to described cell;
S2: judge and whether have the magnitude of voltage of a cell to surpass the first voltage threshold in described battery pack; If so, enter step S3, if not, be back to step S11;
S3: the charging current of described battery set charge/discharge equipment is adjusted into m/mono-of described maximum rated current, described m is more than or equal to 2 positive integer;
S4: whether the charging current of the described battery set charge/discharge equipment in determining step S3 after adjusting is the first current threshold, and if so, described battery set charge/discharge equipment quits work, and if not, is back to step S2;
S5: whether the voltage capacity value that judges each cell reaches the first voltage threshold, if so, described cell charging device quits work, and if not, is back to step S12;
S6: described cell charging device charges to described cell in constant voltage mode;
S7: judge whether cell electric current is reduced to the second current threshold, and if so, cell charging device quits work; If not, be back to step S6.
Wherein, the maximum rated voltage that the first voltage threshold is cell; The first voltage threshold is set according to the type of battery pack and customer requirement.The first current threshold is the lower threshold of the charging current of battery set charge/discharge equipment; The first current threshold is zero to the arbitrary numerical value between the maximum output current of cell charging device.The second current threshold can be set according to the type of battery pack and customer requirement, can be the zero arbitrary numerical value to client's setting, such as: 500mA.
In embodiments of the present invention, power battery pack equalized maintenance system is mainly used in the periodic maintenance (the concrete time determines according to battery variety) to battery pack, while using this system to charge to battery pack, is mainly divided into 2 patterns; In 3 stages, details are as follows now:
(1) pattern 1, large charger of first stage (battery set charge/discharge equipment performance charging is called large charger as the used time) and 3 pairs of batteries of cell charging device charge simultaneously, and cell charging device 3 charges with the electric current of maximum 5~20A (concrete numerical value can be determined according to battery variety and client's requirement), large charger charges with battery maximum rated current, if collect the magnitude of voltage of a certain cell in the process of charging, reach predetermined maximum voltage value, the charging current of large charger is reduced to 1/2 times (staged that progressively declines mise-a-la-masse method) before automatically, or progressively more segmentation progressively reduce electric current, until monomer battery voltage is lower than maximum charging voltage value, and cell charging device 3 continues to proceed with the electric current of maximum 10A the mode CCCV charging of constant current constant voltage, cycle criterion by that analogy, until the current value of large charger is reduced to minimum current value, large charger is automatically closed and is quit work.And cell charging device 3 independently carries out the equalizing charge pattern of CC-CV in all stage for each cell, until reaching required charging, each cell stops current values.Second stage is after large charger is closed, the cell that cell charging device 3 does not reach predetermined value for voltage and energy value continues to carry out constant current constant voltage CC-CV charging with maximum 5-20A electric current, until each monomer battery voltage capability value reaches predetermined value.The cell that has reached predetermined maximum voltage value enters phase III charging simultaneously.Phase III is when monomer battery voltage value reaches maximum, cell charging device 3 is constant voltage CV charging from constant current CC charging automatic Transition before, until each monomer voltage value of battery pack reaches the same numerical value with current value, realize electric voltage equalization and reach predetermined minimum current value, cell charging device 3 cuts out automatically, in whole charging process, between cell charging device 3, be complete independence, be independent of each other.
(2) pattern 2, first stage: large charger is in charging process, as long as a certain monomer battery voltage reaches maximum, large charger quits work, in follow-up whole process, cell charging device 3 is all that electric current with maximum 5~20A carries out constant current constant voltage pattern CC-CV charging, until each cell reaches charging cut-off condition.Second stage is after large charger is closed, the cell that cell charging device 3 does not reach predetermined value for voltage and energy value continues to carry out constant current constant voltage CC-CV charging with maximum 5-20A electric current, until each monomer battery voltage capability value reaches predetermined value.The cell that has reached predetermined maximum voltage value enters phase III charging simultaneously.Phase III is when monomer battery voltage value reaches maximum, cell charging device 3 is constant voltage CV charging from constant current CC charging automatic Transition before, until each monomer voltage value of battery pack reaches the same numerical value with current value, realize electric voltage equalization and reach predetermined minimum current value, cell charging device 3 cuts out automatically, in whole charging process, between cell charging device 3, be complete independence, be independent of each other.The present invention uses large charger and cell charging device 3 to combine to batteries charging maintenance process, and large charger is while having any one monomer battery voltage to reach predetermined maximum in battery pack, charging current is adjusted to original 1/2 times (mode 1), or it is predetermined maximum voltage value that the prerequisite that reduces electric current progressively makes in whole battery pack, there is no the magnitude of voltage of cell, at large charger electric current, be less than certain numerical value, large charger quits work.Little attending device continues to safeguard common work, until maintenance requirement reaches, automatically stops.Large charger is after starting working, out-of-work condition has two, the one, at electric current, in 1/2 mode, successively decrease, or the mode of progressively successively decreasing with charging current is until reach the condition that complete charge stops, or large charger detects any one monomer battery voltage and reaches maximum, large charger just quits work, cell charging device 3 is in whole process, to be to safeguard charging in the mode of constant current constant voltage CC-CV always, and cell charging device 3 is to be also the process of equalized maintenance that cell voltage is carried out battery is charged.Cell charging device 3 is that the connected mode by 4 electrode I+I-V+V-obtains accurate monomer voltage and detects and control.
Compared with prior art, power battery pack equalized maintenance system provided by the invention and method, can complete the equalized maintenance to battery pack fast, and the effect after simultaneously safeguarding is more stable.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.

Claims (8)

1. a power battery pack equalized maintenance system, is connected with the battery pack being composed in series by N cell, it is characterized in that, comprising:
Data processing unit;
The control unit being connected with described data processing unit;
Battery set charge/discharge equipment, its charge-discharge end is connected with described battery pack, and communication terminal is connected with described control unit, and power end is for being connected with AC power; Described battery set charge/discharge equipment is for discharging and recharging and gather magnitude of voltage and the current value at described battery pack two ends to battery pack; And
N cell charging device, the charge-discharge end of each cell charging device is connected in the two ends of a cell in parallel, and the communication terminal of each cell charging device is connected with described control unit, and power end is for being connected with AC power; Each cell charging device is for charging to a cell and gathering magnitude of voltage and the current value at cell two ends; Described N is more than or equal to 2 and be less than or equal to 500 positive integer;
During work, control unit feeds back to described data processing unit by magnitude of voltage and the current value at the magnitude of voltage at described battery pack two ends and current value and each cell two ends; Described data processing unit compares the magnitude of voltage receiving and current value and default threshold value send instruction according to comparative result; Described control unit according to described instruction output control described battery set charge/discharge equipment to the charging current of described battery pack and described cell charging device the charging current to cell, make each cell equalizing charge.
2. power battery pack equalized maintenance system as claimed in claim 1, is characterized in that, described battery set charge/discharge equipment is connected with described data processing unit by the communication bus of CAN bus or RS232 or RS485 formation.
3. power battery pack equalized maintenance system as claimed in claim 1, is characterized in that, described N cell charging device is connected with described data processing unit by the communication bus consisting of CAN bus or RS232 or RS485 respectively.
4. a power battery pack equalized maintenance method for the power battery pack equalized maintenance system based on described in claim 1-3 any one, is characterized in that, comprises the following steps:
S1: charge step:
S11: described battery set charge/discharge equipment carries out constant current charge with the maximum rated current of described cell to described battery pack;
S12: in the time of with described step S11, described cell charging device carries out constant current charge with its maximum output current to described cell;
S2: judge and whether have the magnitude of voltage of a cell to surpass the first voltage threshold in described battery pack; If so, enter step S3, if not, be back to step S11;
S3: the charging current of described battery set charge/discharge equipment is adjusted into m/mono-of described maximum rated current, described m is more than or equal to 2 positive integer;
S4: whether the charging current of the described battery set charge/discharge equipment in determining step S3 after adjusting is the first current threshold, and if so, described battery set charge/discharge equipment quits work, and if not, is back to step S2;
S5: whether the voltage capacity value that judges each cell reaches the first voltage threshold, if so, enters step S6, if not, is back to step S12;
S6: described cell charging device charges to described cell in constant voltage mode;
S7: judge whether cell electric current is reduced to the second current threshold, and if so, cell charging device quits work; If not, be back to step S6.
5. power battery pack equalized maintenance method as claimed in claim 4, is characterized in that, in step S12, the maximum output current of described cell charging device is set according to the type of battery pack and customer requirement.
6. power battery pack equalized maintenance method as claimed in claim 4, is characterized in that, the maximum rated voltage that described the first voltage threshold is cell; Described the first voltage threshold is set according to the type of battery pack and customer requirement.
7. power battery pack equalized maintenance method as claimed in claim 4, is characterized in that, described the first current threshold is the lower threshold of the charging current of described battery set charge/discharge equipment; Described the first current threshold is zero to the arbitrary numerical value between the maximum output current of described cell charging device.
8. power battery pack equalized maintenance method as claimed in claim 4, is characterized in that, described the second current threshold is set according to the type of battery pack and customer requirement.
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CN109507603A (en) * 2018-12-11 2019-03-22 潍柴动力股份有限公司 A kind of power battery external characteristics test method and system
CN111762061A (en) * 2019-04-02 2020-10-13 哈尔滨智木科技有限公司 Power battery pack balance maintenance method and balance maintenance instrument
CN112737032A (en) * 2020-12-29 2021-04-30 科华恒盛股份有限公司 Control method and control device for battery charging and terminal
CN112968226A (en) * 2021-02-04 2021-06-15 河南克能新能源科技有限公司 Capacity restoration method for laggard single-cell battery pack
CN113954692A (en) * 2021-09-07 2022-01-21 东风汽车集团股份有限公司 Battery charging control method, device and equipment

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Publication number Priority date Publication date Assignee Title
CN104362695A (en) * 2014-11-10 2015-02-18 中南民族大学 Series-battery-pack equalization system and control method thereof
CN104362695B (en) * 2014-11-10 2016-08-24 中南民族大学 A kind of series-connected batteries equalizing system and control method thereof
CN105703023A (en) * 2014-11-28 2016-06-22 奇点新源国际技术开发(北京)有限公司 Charging-discharging method and apparatus for standby battery of vehicle-mounted terminal
CN107181011A (en) * 2017-06-16 2017-09-19 倍登新能源科技(苏州)有限公司 A kind of battery modules mend electric installation and its mend method for electrically
CN107769328A (en) * 2017-11-21 2018-03-06 深圳市森树强电子科技有限公司 A kind of more nodal pattern lithium cell charging management methods and device
CN109507603A (en) * 2018-12-11 2019-03-22 潍柴动力股份有限公司 A kind of power battery external characteristics test method and system
CN111762061A (en) * 2019-04-02 2020-10-13 哈尔滨智木科技有限公司 Power battery pack balance maintenance method and balance maintenance instrument
CN112737032A (en) * 2020-12-29 2021-04-30 科华恒盛股份有限公司 Control method and control device for battery charging and terminal
CN112737032B (en) * 2020-12-29 2023-09-29 科华恒盛股份有限公司 Battery charging control method, control device and terminal
CN112968226A (en) * 2021-02-04 2021-06-15 河南克能新能源科技有限公司 Capacity restoration method for laggard single-cell battery pack
CN113954692A (en) * 2021-09-07 2022-01-21 东风汽车集团股份有限公司 Battery charging control method, device and equipment
CN113954692B (en) * 2021-09-07 2023-08-22 东风汽车集团股份有限公司 Battery charging control method, device and equipment

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