CN203387282U - Box-level battery management system - Google Patents

Box-level battery management system Download PDF

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Publication number
CN203387282U
CN203387282U CN201320529697.2U CN201320529697U CN203387282U CN 203387282 U CN203387282 U CN 203387282U CN 201320529697 U CN201320529697 U CN 201320529697U CN 203387282 U CN203387282 U CN 203387282U
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China
Prior art keywords
unit
capacity
cell
voltage
cells
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CN201320529697.2U
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Chinese (zh)
Inventor
张帆
严性平
郑正仙
林晓斌
苏芳
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HANGZHOU BMSER TECHNOLOGY Co Ltd
State Grid Corp of China SGCC
Hangzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
Hangzhou Dayou Technology Development Co Ltd
Original Assignee
HANGZHOU BMSER TECHNOLOGY Co Ltd
State Grid Corp of China SGCC
Hangzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
Hangzhou Dayou Technology Development Co Ltd
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Priority to CN201320529697.2U priority Critical patent/CN203387282U/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 embodiments of the application disclose a box-level battery management system, comprising multiple balance control chips and a box-level controller. The balance control chips are employed to conduct the balance control of any two adjacent single batteries. At the same time, the box-level controller is employed to monitor the work state of each balance control chip. Therefore, the electric quantity balance between any two adjacent single batteries is realized and the performance difference of any two adjacent single batteries is reduced; and moreover, the charging and discharging processes of all the single batteries in a whole battery set can be consistent, so that the service light of the battery set is prolonged. Accordingly, the problems of the prior art are solved.

Description

A kind of case level battery management system
Technical field
The application relates to the electric vehicle engineering field, particularly relates to a kind of case level battery management system.
Background technology
Along with becoming increasingly conspicuous of Environmental and resource issue, the electric automobile that the vehicle power of take is power obtains applying more and more widely.The advantages such as lithium battery has energy density and bulk density is high, operating voltage is high, memory-less effect, the low non-environmental-pollution problem again of self discharge are the ideal power sources of electric automobile.But the voltage of single lithium battery is too small, for obtaining higher operating voltage, need to by the lithium battery series connection, be generally to use after battery pack.
Cell is in manufacture process, dispersiveness with performance, and in use the power brick internal environment also has heterogeneity, therefore along with the increase of service time, performance difference between cell will widen gradually, if and do not take appropriate measures to reduce this species diversity, by causing, some cell overcharges, some cell overdischarge and overcharge and cross the consequence of putting, this not only affects the useful life of battery, damage battery, but also may produce a large amount of heats, cause battery burning or blast.
In prior art, when the battery of electric automobile is used in serial connection, due to battery quality, batch etc. self reason and the in use damage of indivedual cells, make battery pack after long-term the use, performance difference between cell will widen gradually, and this species diversity can become increasing in time, cause when a plurality of batteries in this battery pack charge simultaneously, the cell that capacity is little, always in the super-charge super-discharge state, accelerate the decay in its life-span, finally caused the bulk life time of battery pack to descend thereupon.
Therefore how to reduce in battery pack performance difference between each battery, extend its useful life, become those skilled in the art and be badly in need of the technical problem solved.
The utility model content
In view of this, the application's purpose is to provide a kind of case level battery management system, to solve in existing battery pack, between each cell, has performance difference, and too fast problem decays the useful life of battery pack.
For achieving the above object, the application provides following technical scheme:
A kind of case level battery management system, be applied to a kind of battery pack with a plurality of cells that are connected in series, comprise the battery status signal of the described cell of a plurality of detections and according to described battery status signal, described cell carried out to the balanced control board of the balanced balanced control chip of controlling, and monitoring the operating state of described balanced control chip the case level controller communicated with outside;
Each balanced control chip is connected with adjacent two cells in described battery pack, and each balanced control chip is connected with described case level controller by data wire.
Preferably, described a plurality of balanced control chip is integrated in a circuit board.
Preferably, in described battery pack, the number of cell is 24, and the number of described balanced control chip is 23.
Preferably, described balanced control chip comprises the carrying capacity control unit;
Described carrying capacity control unit comprises:
Detect the carrying capacity detecting unit of the carrying capacity of described adjacent two cells;
According to the testing result of described carrying capacity detecting unit, judge the carrying capacity the judging unit whether carrying capacity of described adjacent two cells there are differences; And,
When judgment result is that of described carrying capacity judging unit is, controls the cell cell little to described carrying capacity that electric charge is large by described carrying capacity and shift, until the identical electric weight branch control unit of the carrying capacity of described adjacent two cells; Wherein,
Described carrying capacity judging unit is connected with the electric weight branch control unit with described carrying capacity detecting unit respectively; Described carrying capacity detecting unit is connected with described adjacent two cells respectively; Described electric weight branch control unit is connected with described adjacent two cells respectively.
Preferably, described balanced control chip also comprises the voltage changer be serially connected with between described adjacent two cells;
Described electric weight branch control unit comprises: determine the computing unit of euqalizing current direction, euqalizing current size and time for balance according to the carrying capacity of described adjacent two cells, and according to the no-load voltage ratio of described euqalizing current direction and the described voltage changer of euqalizing current size adjustment the performance element of described time for balance as the work duration of described voltage changer of usining.
Preferably, described balanced control chip also comprises current control unit;
Described current control unit comprises:
Detect the current detecting unit of the current information of described adjacent two cells;
According to the testing result of described current detecting unit, judge whether described adjacent two cells have at least the electric current of to exceed the overcurrent judging unit of predetermined current scope; And,
When judgment result is that of described overcurrent judging unit is, the over-current protecting unit that the cell of the super scope of described electric current is carried out to overcurrent protection;
Described overcurrent judging unit is connected with over-current protecting unit with described current detecting unit respectively.
Preferably, described balanced control chip also comprises voltage control unit;
Described voltage control unit comprises:
Detect the voltage detection unit of the information of voltage of described adjacent two cells;
According to the testing result of described voltage detection unit, judge whether described adjacent two cells have at least the voltage of one to exceed the overvoltage/undervoltage judging unit of default voltage range; And,
When judgment result is that of described overvoltage/undervoltage judging unit is, the cell of the super scope of described voltage is carried out to the overvoltage/undervoltage protected location of overvoltage/undervoltage protection;
Described overvoltage/undervoltage judging unit is connected with the overvoltage/undervoltage protected location with described voltage detection unit respectively.
Preferably, described balanced control chip also comprises temperature control unit;
Described temperature control unit comprises:
Detect the temperature detecting unit of the temperature information of described adjacent two cells;
According to the testing result of described temperature detecting unit, judge that the mistake whether described adjacent two cells have at least the temperature of to exceed preset temperature range owes warm judging unit; And,
When described mistake is owed judgment result is that of warm judging unit while being, the cell of the super scope of described temperature was carried out owing to the mistake of temperature protection and owed warm protected location;
Described mistake is owed warm judging unit and is owed warm protected location and be connected with crossing with described temperature detecting unit respectively.
Preferably, described case level controller comprises:
With described carrying capacity detecting unit, be connected, with the data storage cell of the carrying capacity of storing each cell;
With described carrying capacity detecting unit and/or data storage cell, be connected, with the data output unit of the carrying capacity of exporting each cell;
With described carrying capacity judging unit, be connected, with the alarm unit of being reported to the police when judgment result is that of described carrying capacity judging unit is.
Preferably, described case level battery management system also comprises: the unit that enables that enables described balanced control chip when described battery capacity decays to preset capacity.
Preferably, described case level battery management system also comprises: obtain the electric energy of described cell and it is supplied with to the low pressure voltage regulation unit of described balanced control chip;
The input of described low pressure voltage regulation unit is connected with at least one cell, and the output of described low pressure voltage regulation unit is connected to described balanced control chip.
Preferably, described case level battery management system also comprises: the voltage lock cell of closing described balanced control chip when the output voltage of described low pressure voltage regulation unit during lower than default minimum operating voltage.
From above-mentioned technical scheme, can find out, the case level battery management system that the application provides comprises a plurality of balanced control chips and one case level controller; By balanced control chip, two cells of arbitrary neighborhood being carried out to equilibrium controls, simultaneously by the operating state of each balanced control chip of case level controller monitoring, realized the electric quantity balancing between two cells of arbitrary neighborhood, reduced its performance difference, and then the charge and discharge process of each cell in whole battery pack can reach consistent, thereby extended the useful life of battery pack, solved the problem of prior art.
The accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, the accompanying drawing the following describes is only some embodiment that put down in writing in the application, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The structured flowchart of the case level battery management system that Fig. 1 provides for the embodiment of the present application one;
The concrete structure block diagram of balanced control chip in the case level battery management system that Fig. 2 provides for the embodiment of the present application two;
The concrete structure block diagram of balanced control chip in the case level battery management system that Fig. 3 provides for the embodiment of the present application three;
The concrete structure block diagram of balanced control chip in the case level battery management system that Fig. 4 provides for the embodiment of the present application four;
Fig. 5 can control according to the capacitance of battery pack the structured flowchart of the case level battery management system of balanced control chip start-up time for what the embodiment of the present application five provided;
Fig. 6 does not need external power supply and has the structured flowchart of the case level battery management system of voltage lock function for what the embodiment of the present application six provided.
Embodiment
In order to make those skilled in the art person understand better the application's scheme, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only the application's part embodiment, rather than whole embodiment.Embodiment based in the application, those of ordinary skills are not making under the creative work prerequisite the every other embodiment obtained, and all belong to the scope of the application's protection.
The application provides a kind of case level battery management system, to solve in existing battery pack, between each cell, has performance difference, and too fast problem decays the useful life of battery pack.
The case level battery management system that the embodiment of the present application provides is applied to a kind of battery pack with a plurality of cells that are connected in series, and realizes that the equilibrium between a plurality of cells is controlled.Referring to Fig. 1, the case level battery management system that the present embodiment one provides comprises balanced control chip 100 and case level controller 200.Wherein, each balanced control chip 100 is connected with adjacent two cells in described battery pack, and each balanced control chip 100 is connected with case level controller 200 by data wire.Balanced control chip 100 gathers and is connected the battery status information of two cells with it, and carries out equilibrium according to this battery status information facing to two cells and control.The operating state of the balanced control chip 100 of case level controller 200 monitoring also communicates with outside (as applied the electric automobile of above-mentioned battery pack).
From said structure and function, the embodiment of the present application is carried out equilibrium by balanced control chip to two cells of arbitrary neighborhood and is controlled, simultaneously by the operating state of each balanced control chip of case level controller monitoring, realized the electric quantity balancing between two cells of arbitrary neighborhood, reduced its performance difference, and then the charge and discharge process of each cell in whole battery pack can reach unanimously, thereby extend the useful life of battery pack, solved the problem of prior art.
Concrete, each cell consists of 3 battery core parallel connections.In each battery pack, the number that forms the cell of battery pack is generally 24, and corresponding, the number of balanced control chip is 23.
In addition, a plurality of balanced control chips are integrated in a circuit board, reduce the space hold amount of case level battery management system, are convenient to install and concentrated wiring.
Below in conjunction with Fig. 2, the concrete structure of the described balanced control chip 100 of the embodiment of the present application is described in detail.
For ease of describing, in the embodiment of the present application, two adjacent cells that connect with same balanced control chip 100 in battery pack are designated as respectively cell A and cell B.
Embodiment bis-as shown in Figure 2, case level battery management system comprises balanced control chip 100 and case level controller 200.Wherein, balanced control chip 100 mainly comprises carrying capacity control unit 110.Carrying capacity control unit 110 specifically comprises carrying capacity detecting unit 111, carrying capacity judging unit 112 and electric weight branch control unit 113.
Carrying capacity judging unit 112 is connected with electric weight branch control unit 113 with carrying capacity detecting unit 111 respectively; Carrying capacity detecting unit 111 is connected with adjacent two cells respectively; Electric weight branch control unit 113 also is connected with above-mentioned adjacent two cells respectively.
In above-mentioned case level battery management system, the course of work/principle of balanced control chip 100 is described below:
Carrying capacity detecting unit 111 detects the carrying capacity SOC of cell A and cell B; Carrying capacity judging unit 112, according to the testing result of carrying capacity detecting unit 111, judges the carrying capacity SOC of cell A acarrying capacity SOC with cell B bwhether there are differences; When judgment result is that of carrying capacity judging unit 112, be (to be SOC a≠ SOC b) time, electric weight branch control unit 113 is controlled the cell cell little to carrying capacity SOC that electric charge is large by carrying capacity SOC and is shifted, until the identical (SOC of the carrying capacity of two cells a=SOC b).
From said structure and operation principle, the embodiment of the present application detects the battery status signal of adjacent two cells in battery pack by balanced control chip, and according to this battery status signal, these adjacent two cells is carried out to equilibrium and control; Especially, when the carrying capacity of above-mentioned adjacent two cells is different, shift and eliminate its carrying capacity difference by electric charge, when the carrying capacity homogeneous phase while of two cells of arbitrary neighborhood, it is consistent that the charge and discharge process of each cell in whole battery pack can reach, thereby reduce even to eliminate the performance difference between cell, extended the useful life of battery pack, solved the problem of prior art.
In addition, the embodiment of the present application is after the carrying capacity difference of judging adjacent two cells, to carrying capacity SOC, large cell does not carry out discharge process to reduce its carrying capacity SOC, but relatively unnecessary electric charge is transferred to the cell that carrying capacity SOC is little by it, avoided energy content of battery waste, realize the maximization of battery capacity, and extended to greatest extent the useful life of battery pack.
Concrete, controlling mode that two electric charges between cell shift can have multiplely, and a kind of preferred implementation that the embodiment of the present application provides as shown in Figure 3.
In embodiment illustrated in fig. 3 three, case level battery management system comprises balanced control chip 100 and case level controller 200.Wherein, balanced control chip 100 comprises carrying capacity control unit 110 and voltage changer 120.Carrying capacity control unit 110 specifically comprises carrying capacity detecting unit 111, carrying capacity judging unit 112 and electric weight branch control unit 113.More specifically, electric weight branch control unit 113 comprises computing unit 1131 and performance element 1132.
The annexation of above-mentioned each unit is: the input of carrying capacity detecting unit 111 respectively with battery pack in adjacent two cells (be designated as respectively cell A and cell B, so that describe) connect, the output of carrying capacity detecting unit 111 is connected with the output of computing unit 1131 with the output of carrying capacity judging unit 112 respectively; The output of carrying capacity detecting unit 111 is connected with the Enable Pin of computing unit 1131; The input of performance element 1132 is connected with the output of computing unit 1131, the output of performance element 1132 is connected with the control end of voltage changer 120, the non-control end of voltage changer 120 1 is connected with cell A, and another non-control end is connected with cell B.
In above-mentioned battery pack, 100 couples of cell A of balanced control chip and cell B carry out the balanced operation principle of controlling and are described below.
When carrying capacity judging unit 112 is judged the carrying capacity SOC of the cell A that carrying capacity detecting units 111 detect acarrying capacity SOC with cell B bwhen different, to the Enable Pin transmission enable signal of computing unit 1132.
After computing unit 1131 receives enable signal, according to the carrying capacity SOC of cell A acarrying capacity SOC with cell B bdetermine euqalizing current direction, euqalizing current size and time for balance; Wherein, the euqalizing current direction is for by carrying capacity, large cell flows to the cell that carrying capacity is little; Half of the carrying capacity difference that the product of euqalizing current size and time for balance is two cells (| SOC a-SOC b|/2).
After performance element 1132 receives the result of calculation of computing unit 1131, starting resistor converter 120 also starts timing, the no-load voltage ratio of regulation voltage converter 120, make the sense of current, the size that flow through voltage changer 120 be respectively above-mentioned euqalizing current direction and euqalizing current size simultaneously; When the timing duration reach above-mentioned all with the time after, performance element 1132 is controlled voltage changers 120 and is quit work.
The no-load voltage ratio of supposing voltage changer 120 is U a: U b(U athe voltage that means the end that voltage changer 120 is connected with cell A, U bthe voltage that means the end that voltage changer 120 is connected with cell B), if SOC a>SOC b, the no-load voltage ratio U of performance element 1132 regulation voltage converters 120 a: U b1, make euqalizing current flow to cell B by cell A.And because size and the time for balance of euqalizing current influences each other, therefore can determine according to actual equalization request; For example,, if only require time for balance to be no more than t in practical application 0, can set time for balance is t(0<t≤t 0), corresponding euqalizing current size I=|SOC a-SOC b|/(2t); If require time for balance to be no more than t in practical application 0and euqalizing current is no more than I 0, can set the euqalizing current size for I(0<I≤I 0), corresponding time for balance t '=| SOC a-SOC b|/(2I)≤t 0.
From above-described embodiment, the embodiment of the present application is by controlling the start and stop of voltage changer, and regulate its no-load voltage ratio, realized that the electric charge between adjacent two cells quantitatively shifts, not only eliminated the carrying capacity difference between two cells, also avoided energy content of battery waste, realized the maximization of battery capacity, and then the charge and discharge process that makes each cell in whole battery pack reaches consistent, reduce even to eliminate the performance difference between cell, extend to greatest extent the useful life of battery pack, solved the problem of prior art.
The applicant finds in research process, electric current, voltage or excess Temperature/low phenomenon also may appear in the cell in battery pack in charge and discharge process, these phenomenons will cause certain infringement to cell, cause the performance difference between cell, shorten the useful life of cell.Therefore, be necessary to take certain measure to eliminate above-mentioned phenomenon, to reach better battery balanced control effect.
In view of the foregoing, the embodiment of the present application four or three provides another kind of case level battery management system, and as shown in Figure 4, this case level battery management system comprises balanced control chip 100 and case level controller 200.Wherein, balanced control chip 100 comprises carrying capacity control unit 110, voltage changer 120 and current control unit 130.
Carrying capacity control unit 110 specifically comprises carrying capacity detecting unit 111, carrying capacity judging unit 112 and electric weight branch control unit 113.More specifically, electric weight branch control unit 113 comprises computing unit and performance element.In the present embodiment, the annexation between each component units of carrying capacity detecting unit 110 and operation principle can, with reference to mentioned above, not repeat them here.
Current control unit 130 comprises current detecting unit 131, overcurrent judging unit 132 and over-current protecting unit 133.Wherein, overcurrent judging unit 132 is connected with over-current protecting unit 133 with current detecting unit 131 respectively.
Current detecting unit 131 is connected with cell B with cell A respectively, for detection of the electric current I of cell A aelectric current I with cell B b; Overcurrent judging unit 132, according to the testing result of current detecting unit 131, judges whether cell A and cell B have at least the electric current of to exceed the predetermined current scope; When judgment result is that of overcurrent judging unit 132 is, the cell of 133 pairs of super scopes of electric current of over-current protecting unit carries out overcurrent protection.For example,, if overcurrent judging unit 132 is judged the electric current I of cell A asurpass predetermined current maximum I max, 133 couples of cell A of over-current protecting unit carry out overcurrent protection; If overcurrent judging unit 132 is judged the electric current I of cell B bsurpass predetermined current maximum I max, 1330 couples of cell B of over-current protecting unit carry out overcurrent protection.The overcurrent protection mode that the present embodiment adopts is Cycle by Cycle (Cycle by Cycle) current control mode.The present embodiment is only taked safeguard measure when the cell electric current is excessive; In fact, if application demand is arranged, also can when the cell electric current is too low, take corresponding safeguard measure, be that electric current recovers normal value.
In addition; the electric current of the cell that current detecting unit 131 gathers had both comprised the charging current in the cell charging process; also comprise the discharging current in the cell discharge process, charging process and the discharge process of cell carried out to overcurrent protection simultaneously.
Still, with reference to Fig. 4, in the case level battery management system that the embodiment of the present application provides, balanced control chip 100 also comprises voltage control unit 140.
Concrete, voltage control unit 140 comprises voltage detection unit 141, overvoltage/undervoltage judging unit 142 and overvoltage/undervoltage protected location 143.Wherein, overvoltage/undervoltage judging unit 142 is connected with overvoltage/undervoltage protected location 143 with voltage detection unit 141 respectively.
Voltage detection unit 141 is connected with cell B with cell A respectively, for detection of the voltage U of cell A avoltage U with cell B b; Overvoltage/undervoltage judging unit 142, according to the testing result of voltage detection unit 141, judges whether cell A and cell B have at least the voltage of one to exceed default voltage range; If so, the cell of 143 pairs of super scopes of this voltage of overvoltage/undervoltage protected location carries out the overvoltage/undervoltage protection.For example,, if overvoltage/undervoltage judging unit 142 is judged the voltage U of cell A aexceed the predeterminated voltage scope and (be specially U abe less than default minimum voltage value U min, or, U abe greater than default maximum voltage value U max), 143 couples of cell A of overvoltage/undervoltage protected location carry out the overvoltage/undervoltage protection; Accordingly, if overvoltage/undervoltage judging unit 142 is judged the voltage U of cell B bexceed the predeterminated voltage scope and (be specially U bbe less than default minimum voltage value U min, or, U bbe greater than default maximum voltage value U max), 143 couples of cell B of overvoltage/undervoltage protected location carry out the overvoltage/undervoltage protection.The concrete mode of overvoltage/undervoltage protection has multiple, and the optimal way of the embodiment of the present application is for ending the control of 113 pairs of voltage changers 120 of electric weight branch control unit, until voltage returns in the predeterminated voltage scope.
In addition, be pre-anti-overcharge phenomenon, voltage control unit 140 also comprises charging modes control unit 144, for the charging modes of battery pack is set according to the testing result of voltage detection unit 141 in charging process; That is,, at the charging initial stage, hour, charging modes control unit 144 arranges battery pack and is charged in the high-power string mode of filling the voltage that voltage detection unit 141 detects, to improve charging rate, to guarantee charge efficiency; Charging latter stage, when the voltage that voltage detection unit 141 detects is larger, charging modes control unit 144 arranges battery pack and is charged with small-power the mode of filling, and to slow down charging rate, prevents from overcharging.Therefore, control battery pack by charging modes control unit 144 and switch under two kinds of charging modes, realized the unification of charge efficiency and charge protection.
Still, with reference to Fig. 4, in the case level battery management system that the embodiment of the present application provides, balanced control chip 100 also comprises temperature control unit 150.
Concrete, temperature control unit 150 comprises temperature detecting unit 151, crosses and owe warm judging unit 152 and cross and owe warm protected location 153.Wherein, cross and to owe warm judging unit 152 and owe warm protected location 153 with temperature detecting unit 151 and mistake respectively and be connected.
Temperature detecting unit 1510 is connected with cell B with cell A respectively, for detection of the temperature T of cell A atemperature T with cell B b; Cross and owe the testing result of warm judging unit 152 according to temperature detecting unit 151, judge whether cell A and cell B have at least the temperature of to exceed preset temperature range; If so, cross the cell of owing 153 pairs of super scopes of this temperature of warm protected location and carried out owing the temperature protection, its temperature is returned in preset temperature range.For example, owe if cross the temperature T that warm judging unit 152 is judged cell A aexceed preset temperature range and (be specially T abe greater than default maximum temperature T max, or, T abe less than default minimum temperature T min), excessively owe capable mistake of 153 couples of cell A of warm protected location and owe the temperature protection; Accordingly, owe if cross the temperature T that warm judging unit 152 is judged cell B bexceed preset temperature range and (be specially T bbe greater than default maximum temperature T max, or, T bbe less than default minimum temperature T min), excessively owe capable mistake of 153 couples of cell B of warm protected location and owe the temperature protection.Crossing the concrete mode of owing the temperature protection has multiple; the embodiment of the present application is preferably as follows mode; when temperature exceeds preset temperature range; cross and owe warm protected location 153 and control voltage changers 120 and quit work; in the time of in temperature returns to preset temperature range, owing warm protected location 153 restarts voltage changer 120 excessively.
It should be noted that, in practical application, balanced control chip can possess above-mentioned current control unit, voltage control unit and temperature control unit simultaneously, also can only comprise any one or two kinds wherein.
From said structure and operation principle; the embodiment of the present application is carried out overcurrent protection by current control unit to the cell in battery pack; by voltage control unit, cell is carried out to the overvoltage/undervoltage protection; carried out owing the temperature protection by temperature control unit to cell; avoided cell electric current, voltage or excess Temperature/low phenomenon to occur; eliminated its impact on the cell performance, optimized to a certain extent battery balanced control effect, extended useful life of cell.Simultaneously, control battery pack by the charging modes control unit and switch under two kinds of charging modes, realized the unification of charge efficiency and charge protection.
Further, in the described case level of above-described embodiment battery management system, case level controller comprises at least one in data storage cell, data output unit and alarm unit.
Wherein, data storage cell and above-mentioned carrying capacity detecting unit, current detecting unit, voltage detection unit are connected with at least one in temperature detecting unit, for storing the state information of each cell; This state information comprises the testing result of each detecting unit be connected with this data storage cell, as carrying capacity, electric current, voltage or the temperature of cell.
The data output unit is for exporting the state information of each cell, and this data output unit both can directly be connected with above-mentioned data storage cell, with the state information of the cell stored in direct reading out data memory cell and by its output; Also can connect by the detecting unit corresponding with the state information of needs output, as only needed the carrying capacity of output cell, only the data output unit is connected and gets final product with the carrying capacity detecting unit.
Alarm unit is owed warm judging unit with above-mentioned carrying capacity judging unit, overcurrent judging unit, overvoltage/undervoltage judging unit and mistake respectively, for when judgment result is that of arbitrary judging unit is, reports to the police accordingly.For example, can set as follows type of alarm: when judgment result is that of carrying capacity judging unit is, carry out the buzzing warning; When judgment result is that of overvoltage/undervoltage judging unit is, carry out luminous alarm etc.
For reducing power consumption, the battery pack that the embodiment of the present application five provides a kind of case level battery management system, can start according to the balanced control chip of the working state control of battery pack self in good time.As shown in Figure 5, this case level battery management system battery pack comprises balanced control chip 100, case level controller 200 and enables unit 300.When battery pack is used the initial stage, do not need balanced control, therefore balanced control chip 100 does not start, to reduce power consumption, and only have, enable the capacitance that unit 300 detects battery pack; Growth service time along with battery, the capacitance of battery pack decays gradually, when the capacitance fall-off that enables the battery pack that unit 300 detects during to predetermined threshold value (be generally initial capacitance 80%), enable unit 300 and trigger balanced control chip 100, make balanced control chip 100 start that cell in battery pack is carried out to equilibrium and control.
In the equal battery pack of case level battery management system that the present embodiment provides, the operating voltage of balanced control chip can provide by external power supply.For reducing the space hold amount of battery pack, be convenient to encapsulation, the battery pack that the embodiment of the present application six provides a kind of case level battery management system, power taking supply balance control chip from self controlled battery pack.As shown in Figure 6, this case level battery management system battery pack comprises balanced control chip 100, case level controller 200 and low pressure voltage regulation unit 400.Wherein in 100 pairs of battery pack of balanced control chip, adjacent two cells carry out equilibrium control; The input of low pressure voltage regulation unit 400 at least is connected with a cell, output connects with balanced control chip 100, low pressure voltage regulation unit 400 power taking from connected cell, and be converted to the operating voltage of balanced control chip 100, thereby do not need independent external power source, reduce the space hold amount of battery pack, improved the independence of case level battery management system battery pack, be convenient to application.
Concrete, above-mentioned low pressure voltage regulation unit can adopt low pressure linear voltage regulator LDO.
Further, still with reference to Fig. 6, the case level battery management system that the embodiment of the present application provides also comprises voltage lock cell 500.Voltage lock cell 500 is connected with balanced control chip 100 with low pressure voltage regulation unit 400 respectively, output voltage size for detection of low pressure voltage regulation unit 400, when this output voltage during lower than the minimum operating voltage (being generally 3.2V) of balanced control chip 100, control balanced control chip 100 and enter resting state, stop the equilibrium of battery pack is controlled, to prevent balanced control chip 100 misoperations.
Device embodiment described above is only schematic, the wherein said unit as the separating component explanation can or can not be also physically to separate, the parts that show as unit can be or can not be also physical locations, can be positioned at a place, or also can be distributed on a plurality of network element.Can select according to the actual needs some or all of module wherein to realize the purpose of the present embodiment scheme.Those of ordinary skills in the situation that do not pay creative work, can understand and implement.
The above is only the application's embodiment; it should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the application's principle; can also make some improvements and modifications, these improvements and modifications also should be considered as the application's protection range.

Claims (12)

1. a case level battery management system, be applied to a kind of battery pack with a plurality of cells that are connected in series; It is characterized in that, comprise the battery status signal of the described cell of a plurality of detections and according to described battery status signal, described cell carried out to the balanced control board of the balanced balanced control chip of controlling, and monitoring the operating state of described balanced control chip the case level controller communicated with outside;
Each balanced control chip is connected with adjacent two cells in described battery pack, and each balanced control chip is connected with described case level controller by data wire.
2. case level battery management system according to claim 1, is characterized in that, described a plurality of balanced control chips are integrated in a circuit board.
3. case level battery management system according to claim 1, is characterized in that, in described battery pack, the number of cell is 24, and the number of described balanced control chip is 23.
4. according to the described case level of claim 1~3 any one battery management system, it is characterized in that, described balanced control chip comprises the carrying capacity control unit;
Described carrying capacity control unit comprises:
Detect the carrying capacity detecting unit of the carrying capacity of described adjacent two cells;
According to the testing result of described carrying capacity detecting unit, judge the carrying capacity the judging unit whether carrying capacity of described adjacent two cells there are differences; And,
When judgment result is that of described carrying capacity judging unit is, controls the cell cell little to described carrying capacity that electric charge is large by described carrying capacity and shift, until the identical electric weight branch control unit of the carrying capacity of described adjacent two cells; Wherein,
Described carrying capacity judging unit is connected with the electric weight branch control unit with described carrying capacity detecting unit respectively; Described carrying capacity detecting unit is connected with described adjacent two cells respectively; Described electric weight branch control unit is connected with described adjacent two cells respectively.
5. case level battery management system according to claim 4, is characterized in that, described balanced control chip also comprises the voltage changer be serially connected with between described adjacent two cells;
Described electric weight branch control unit comprises: determine the computing unit of euqalizing current direction, euqalizing current size and time for balance according to the carrying capacity of described adjacent two cells, and according to the no-load voltage ratio of described euqalizing current direction and the described voltage changer of euqalizing current size adjustment the performance element of described time for balance as the work duration of described voltage changer of usining.
6. case level battery management system according to claim 4, is characterized in that, described balanced control chip also comprises current control unit;
Described current control unit comprises:
Detect the current detecting unit of the current information of described adjacent two cells;
According to the testing result of described current detecting unit, judge whether described adjacent two cells have at least the electric current of to exceed the overcurrent judging unit of predetermined current scope; And,
When judgment result is that of described overcurrent judging unit is, the over-current protecting unit that the cell of the super scope of described electric current is carried out to overcurrent protection;
Described overcurrent judging unit is connected with over-current protecting unit with described current detecting unit respectively.
7. case level battery management system according to claim 4, is characterized in that, described balanced control chip also comprises voltage control unit;
Described voltage control unit comprises:
Detect the voltage detection unit of the information of voltage of described adjacent two cells;
According to the testing result of described voltage detection unit, judge whether described adjacent two cells have at least the voltage of one to exceed the overvoltage/undervoltage judging unit of default voltage range; And,
When judgment result is that of described overvoltage/undervoltage judging unit is, the cell of the super scope of described voltage is carried out to the overvoltage/undervoltage protected location of overvoltage/undervoltage protection;
Described overvoltage/undervoltage judging unit is connected with the overvoltage/undervoltage protected location with described voltage detection unit respectively.
8. case level battery management system according to claim 4, is characterized in that, described balanced control chip also comprises temperature control unit;
Described temperature control unit comprises:
Detect the temperature detecting unit of the temperature information of described adjacent two cells;
According to the testing result of described temperature detecting unit, judge that the mistake whether described adjacent two cells have at least the temperature of to exceed preset temperature range owes warm judging unit; And,
When described mistake is owed judgment result is that of warm judging unit while being, the cell of the super scope of described temperature was carried out owing to the mistake of temperature protection and owed warm protected location;
Described mistake is owed warm judging unit and is owed warm protected location and be connected with crossing with described temperature detecting unit respectively.
9. case level battery management system according to claim 4, is characterized in that, described case level controller comprises:
With described carrying capacity detecting unit, be connected, with the data storage cell of the carrying capacity of storing each cell;
With described carrying capacity detecting unit and/or data storage cell, be connected, with the data output unit of the carrying capacity of exporting each cell;
With described carrying capacity judging unit, be connected, with the alarm unit of being reported to the police when judgment result is that of described carrying capacity judging unit is.
10. according to the described case level of claim 1~3 any one battery management system, it is characterized in that, also comprise: the unit that enables that enables described balanced control chip when described battery capacity decays to preset capacity.
11. according to the described case level of claim 1~3 any one battery management system, it is characterized in that, also comprise: obtain the electric energy of described cell and it is supplied with to the low pressure voltage regulation unit of described balanced control chip;
The input of described low pressure voltage regulation unit is connected with at least one cell, and the output of described low pressure voltage regulation unit is connected to described balanced control chip.
12. case level battery management system according to claim 11, is characterized in that, also comprises: the voltage lock cell of closing described balanced control chip when the output voltage of described low pressure voltage regulation unit during lower than default minimum operating voltage.
CN201320529697.2U 2013-08-28 2013-08-28 Box-level battery management system Expired - Fee Related CN203387282U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104426179A (en) * 2013-08-28 2015-03-18 国家电网公司 Box-level battery management system
CN105429227A (en) * 2015-12-16 2016-03-23 浙江大学 Battery management and control system for underwater vehicle
CN107834620A (en) * 2017-09-30 2018-03-23 浙江大学 A kind of lithium battery group charging method of multiobjective optimal control

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104426179A (en) * 2013-08-28 2015-03-18 国家电网公司 Box-level battery management system
CN104426179B (en) * 2013-08-28 2017-02-22 国家电网公司 Box-level battery management system
CN105429227A (en) * 2015-12-16 2016-03-23 浙江大学 Battery management and control system for underwater vehicle
CN107834620A (en) * 2017-09-30 2018-03-23 浙江大学 A kind of lithium battery group charging method of multiobjective optimal control
CN107834620B (en) * 2017-09-30 2020-05-29 浙江大学 Multi-objective optimization control lithium battery pack charging method

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