CN112737056A - Method and device for balancing electric quantity of battery module - Google Patents
Method and device for balancing electric quantity of battery module Download PDFInfo
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- CN112737056A CN112737056A CN202110046218.0A CN202110046218A CN112737056A CN 112737056 A CN112737056 A CN 112737056A CN 202110046218 A CN202110046218 A CN 202110046218A CN 112737056 A CN112737056 A CN 112737056A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
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Abstract
The application discloses electric quantity equalization method and device of battery module, battery module include a plurality of parallelly connected battery cells, its method includes: acquiring the current of a battery module and the running state information of each single battery; determining the state of charge value of each single battery according to the current and the running state information; determining the maximum state of charge value and the minimum state of charge value of the single batteries in the battery module according to the state of charge values of the single batteries, and determining the difference value between the maximum state of charge value and the minimum state of charge value; and under the conditions that the difference value is larger than the preset threshold value and the running state of each single battery meets the first triggering condition, enabling the balance switch of each single battery is controlled to complete the electric quantity balance of the battery module. The battery module is simple in calculation structure and small in calculation amount, the accuracy of electric quantity balance of each single battery is obviously improved, the electric quantity balance efficiency of the battery module is improved, and the burden of a main control circuit is greatly reduced.
Description
Technical Field
The application relates to the technical field of electric energy storage, in particular to an electric quantity balancing method and device of a battery module.
Background
The large-capacity battery energy storage system is widely applied to power systems, such as power grid frequency modulation, peak clipping and valley filling, uninterrupted power supply, improvement of power quality and the like. In large capacity battery energy storage power stations, the energy storage battery is typically made up of dozens or even hundreds of strings of battery modules. The differences in the material, manufacturing process, and usage environment of the battery module can make the parameters of the battery module, such as voltage, internal resistance, and capacity, inconsistent. The difference is mainly reflected in the process of charging the battery module, and the battery with overhigh voltage can be overcharged; during the discharge of the battery module, a battery having an excessively low voltage may be overdischarged. After the discreteness of the battery in the battery module is increased, the overall capacity of the energy storage battery is reduced, and the battery module can fail in advance when the overall capacity is serious.
In the prior art, the balancing method for the battery module mainly comprises two types of active balancing and passive balancing, the active balancing transfers the highest energy of a single battery to the lowest energy of the single battery or supplements the whole group of energy to the lowest energy of the single battery in an energy transfer mode, an energy storage link is needed in the implementation process, the energy is redistributed through the link, and although the active balancing effectively realizes the balancing of the battery module, the balancing circuit is complex, the stability is poor and the cost is high; the passive equalization aims at achieving the purpose of overall equalization by consuming energy of single batteries with high energy, the passive equalization circuit is simple in structure and low in cost, but the equalization current of the traditional passive equalization circuit is about 0.2A, so that the passive equalization circuit is difficult to meet application occasions such as power grid frequency modulation, peak clipping and valley filling and the like with high real-time requirements.
Disclosure of Invention
In view of the above problems, the present application is made to provide a method and apparatus for equalizing electric quantity of battery modules that overcomes or at least partially solves the above problems.
According to an aspect of the present application, there is provided a method for balancing electric quantity of a battery module, the battery module including a plurality of parallel single batteries, including:
acquiring current of a battery module and running state information of each single battery, wherein the running state information comprises voltage and temperature of each single battery;
determining the state of charge value of each single battery according to the current and the running state information;
determining the maximum state of charge value and the minimum state of charge value of the single batteries in the battery module according to the state of charge values of the single batteries, and determining the difference value between the maximum state of charge value and the minimum state of charge value;
and under the conditions that the difference value is larger than the preset threshold value and the running state of each single battery is determined to meet the first triggering condition, firstly controlling the enabling of the equalizing switch of one part of the single batteries, and then controlling the enabling of the equalizing switch of the other part of the single batteries so as to complete the electric quantity equalization of the battery module.
Optionally, in the above method, first controlling the enable of the balancing switch of one part of the single batteries, and then controlling the enable of the balancing switch of another part of the single batteries, so as to complete the electric quantity balancing of the battery module, includes:
and firstly, enabling the equalizing switches of the single batteries with odd numbers, and then enabling the equalizing switches of the single batteries with even numbers to finish the electric quantity equalization of the battery module.
Optionally, in the method, determining that the operating state of each single battery meets the first trigger condition includes:
under the condition that the voltage of each single battery is smaller than a first preset voltage, determining that the running state of each single battery meets a first trigger condition;
and/or the presence of a gas in the gas,
and under the condition that the temperature of each single battery is smaller than the preset temperature, determining that the running state of each single battery meets a first trigger condition.
Optionally, the method further includes:
and under the condition that the difference value and/or the running state of each single battery meets the second triggering condition, determining that the electric quantity balance of the battery module is finished.
Optionally, in the foregoing method, determining that the difference and/or the operating state of each battery cell satisfies the second trigger condition includes:
determining that the difference value meets a second trigger condition under the condition that the difference value is less than or equal to a preset threshold value;
and/or the presence of a gas in the gas,
under the condition that the voltage of each single battery is determined to be less than or equal to a second preset voltage, determining that the running state of each single battery meets a second trigger condition; and/or determining that the running state of each single battery meets a second trigger condition under the condition that the temperature of each single battery is determined to be greater than or equal to the preset temperature.
According to another aspect of the present application, there is provided an electric quantity equalizing device of a battery module, the battery module including a plurality of parallel-connected single batteries, the device including:
the acquisition unit is used for acquiring the current of the battery module and the running state information of each single battery, wherein the running state information comprises the voltage and the temperature of each single battery;
the data processing unit is used for determining the state of charge value of each single battery according to the current and the running state information; the device comprises a battery module, a control module and a control module, wherein the control module is used for determining a maximum charge state value and a minimum charge state value of a single battery in the battery module according to the charge state values of the single batteries and determining a difference value between the maximum charge state value and the minimum charge state value;
and the control unit is used for controlling the enabling of the equalization switches of one part of the single batteries firstly and then controlling the enabling of the equalization switches of the other part of the single batteries to finish the electric quantity equalization of the battery module under the conditions that the difference value is determined to be larger than the preset threshold value and the running state of each single battery is determined to meet the first trigger condition.
Optionally, in the above apparatus, the control unit is configured to control the enable of the balancing switch of the odd-numbered battery cell first, and then control the enable of the balancing switch of the even-numbered battery cell, so as to complete the power balancing of the battery module.
Optionally, in the above apparatus, the control unit is configured to determine that the operating state of each single battery meets a first trigger condition when it is determined that the voltage of each single battery is smaller than a first preset voltage;
and/or the presence of a gas in the gas,
and the control device is used for determining that the running state of each single battery meets a first trigger condition under the condition that the temperature of each single battery is smaller than the preset temperature.
Optionally, in the above apparatus, the control unit is further configured to determine that the electric quantity balance of the battery module is finished when the difference is determined and/or the operating state of each battery cell meets the second trigger condition.
Optionally, in the above apparatus, the control unit is configured to determine that the difference satisfies the second trigger condition when determining that the difference is smaller than or equal to the preset threshold;
and/or the presence of a gas in the gas,
the control circuit is used for determining that the running state of each single battery meets a second trigger condition under the condition that the voltage of each single battery is less than or equal to a second preset voltage; and/or determining that the running state of each single battery meets a second trigger condition under the condition that the temperature of each single battery is determined to be greater than or equal to the preset temperature.
In accordance with a third aspect of the present application, there is provided an electronic device comprising: a processor; and a memory arranged to store computer executable instructions that, when executed, cause the processor to perform a method of implementing an electronic device customisation mode as described in any one of the above.
According to a fourth aspect of the present application, there is provided a computer-readable storage medium, wherein the computer-readable storage medium stores one or more programs which, when executed by a processor, implement the method for implementing the customization mode of the electronic device according to any one of the above.
The method has the advantages that the advantages of the active equalization mode and the passive equalization mode are taken into consideration, the method is simple in calculation structure and small in calculation amount, transmission among the single batteries among the battery modules is considered, accuracy of electric quantity equalization of the single batteries is remarkably improved, electric quantity equalization efficiency of the battery modules is improved, and burden of a main control circuit is greatly reduced.
As is apparent from the above description, the technical solutions of the present application are only the outline of the technical solutions of the present application, and the embodiments of the present application will be described below in order to make the technical means of the present application more clearly understood and to make the above and other objects, features, and advantages of the present application more obvious.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 shows a schematic structural diagram of a battery system according to an embodiment of the present application;
fig. 2 illustrates an exploded view of a charge equalization apparatus of a battery module according to an embodiment of the present application;
fig. 3 is a schematic flow chart illustrating a method for balancing power of a battery module according to an embodiment of the present application;
fig. 4 is a schematic flow chart illustrating a method for balancing the power of the battery module according to another embodiment of the present application;
fig. 5 is a schematic structural diagram illustrating a charge equalization apparatus of a battery module according to an embodiment of the present application;
FIG. 6 shows a schematic structural diagram of an electronic device according to an embodiment of the present application;
FIG. 7 shows a schematic structural diagram of a computer-readable storage medium according to an embodiment of the present application.
Detailed Description
Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The concept of the application lies in that, aiming at the defects of an active electric quantity equalization method and a passive electric quantity equalization method in the prior art, an electric quantity equalization method of a battery module is provided, the charging conditions of all single batteries are combined through charge state values, the time when the battery module enters electric quantity equalization is judged, and the electric quantity equalization is independently carried out on all the single batteries, so that the balance among the electric quantities of all the single batteries is achieved.
Fig. 1 shows a schematic structural diagram of a battery system according to an embodiment of the present application, where the battery system includes a battery module, the battery module includes a plurality of single batteries connected in parallel, and the battery module may be a lithium battery, a flow battery, or the like. The battery system also comprises electric quantity balancing equipment, the equipment comprises an information acquisition and control circuit board and an electric quantity balancing circuit board, and the information acquisition and control circuit board can acquire the current of the battery module and the voltage and the temperature of each single battery; the electric quantity balancing circuit board is used for balancing the electric quantity of each single battery, including but not limited to the electric quantity of the single battery which consumes high electric quantity.
According to some embodiments of the present application, there is provided a power equalization apparatus of a battery module, as shown in fig. 2, fig. 2 shows an explosion diagram of the power equalization apparatus of the battery module according to an embodiment of the present application, as shown in fig. 2, the power equalization apparatus 200 includes: the device comprises a shell 210, a base 220, at least one information acquisition and control circuit board 230 and at least one electric quantity equalization circuit board 240.
The housing 210 and the base 220 may be fixed by, but not limited to, a screw connection, and the two form an accommodating cavity of the power balancing device 200, the information acquisition and control circuit board 230 and the power balancing circuit board 240 are disposed in the accommodating cavity, and the information acquisition and control circuit board 230 is electrically connected to the power balancing circuit board 240, specifically, but not limited to, a pin of the information acquisition and control circuit board is connected to a pin of the power balancing circuit board.
The information acquisition and control circuit board 230 is provided with a battery information acquisition interface 231, and the battery information acquisition interface 231 is connected with an acquisition signal line of the battery module.
In addition, in order to obtain the current of the battery module, a current transformer (not shown in the figure) may be disposed inside the power equalization device of the battery module, or may be disposed outside the power equalization device, and the current transformer is electrically connected to the information collecting and controlling circuit board 230 to transmit the current information to the information collecting and controlling circuit board 230.
In some embodiments of the present application, the power equalization circuit board 240 includes a plurality of equalization circuits 241 isolated from each other, each of which is connected in parallel with one of the single batteries, wherein the equalization circuit includes an equalization switch and a current limiting resistor connected in series.
In order to enable the power equalization circuit board 240 to better dissipate heat, the power equalization device 200 further includes a heat conductive adhesive tape 250; the heat conducting adhesive tape 250 is adhered to the base 220, and the electric quantity balancing circuit board 240 is tightly arranged on the heat conducting adhesive tape 250, so that heat generated by the electric quantity balancing circuit board 240 in the electric quantity balancing process of the battery module can be dissipated from the base 220 to the outside of the accommodating cavity of the electric quantity balancing device 200 through the heat conducting adhesive tape 250.
In some embodiments of the present application, the information collecting and controlling circuit board 230, the power balancing circuit board 240, and the heat conducting adhesive tape 250 are sequentially disposed in the accommodating cavity from top to bottom. The information collecting and controlling circuit board 230 and the power balancing circuit board 240 are fixed on the base 220 through the insulating connection column 260.
Under the condition that a plurality of information acquisition and control circuit boards 230, a plurality of electric quantity balancing circuit boards 240 and a plurality of heat conducting adhesive tapes 250 are arranged, one information acquisition and control circuit board 230, one electric quantity balancing circuit board 240 and one heat conducting adhesive tape 250 are sequentially arranged in the accommodating cavity from top to bottom; each information collecting and controlling circuit board 230, the electric quantity balancing circuit board 240 and the heat conducting rubber strip 250 can be arranged in parallel.
Compared with the prior art, the battery module's electric quantity balancing equipment that this application provided has adopted information acquisition and control circuit board 230 and electric quantity balancing circuit board 240 separation design, and like this, the heat that electric quantity balancing circuit board 230 produced can not transmit to information acquisition and control circuit board 230, is showing accuracy and the precision that has improved each battery cell operation information acquisition.
It should be noted that the above-mentioned battery module power equalization apparatus is only an exemplary description, and the method provided by the present application is not limited to the above-mentioned apparatus, and any apparatus that can meet the requirements of the method provided by the present application may be used.
Fig. 3 is a schematic flow chart illustrating a method for balancing electric quantity of a battery module according to an embodiment of the present application, which may be implemented by, but not limited to, any one of the electric quantity balancing devices described above, where as shown in fig. 3, the method for balancing electric quantity includes:
step S310, acquiring the current of the battery module and the running state information of each single battery, wherein the running state information comprises the voltage and the temperature of each single battery;
first, the current of the battery module, and the voltage and temperature of each unit battery are obtained.
In this embodiment, it is assumed that the number of the single cells is 24, and the voltage of each single cell is v (n) and the temperature temp (n), where n is the number of the single cell in the battery module, n is 1,2, …, and 24, and hereinafter, v (n) represents the voltage of the single cell with the number n.
Because the single batteries are connected in parallel, the currents at all positions of the battery module are equal; since the charge amount of each unit cell is different, the voltage and temperature of each unit cell are different.
And step S320, determining the state of charge value of each single battery according to the current and the running state information.
The State of Charge (SOC) of a battery is used to reflect the remaining capacity of the battery, which is numerically defined as the ratio of the remaining capacity to the battery capacity, expressed as a percentage. The SOC is 100% -DOD, the DOD is the battery discharge capacity, and the SOC is 100% to indicate that the battery is in a full charge state.
The SOC (state of charge) value of each single battery can be calculated or estimated according to the current, the voltage and the temperature of each single battery, wherein n is the serial number of the single battery in the battery module, and n is 1,2, … and 24. The calculation method may be any one of the prior art methods, such as an integral method.
Step S330, determining the maximum state of charge value and the minimum state of charge value of the single batteries in the battery module according to the state of charge values of the single batteries, and determining the difference value between the maximum state of charge value and the minimum state of charge value.
In the present application, in order to balance the electric quantity between the single batteries, the electric quantity transmission between the single batteries is considered, and the difference between the maximum state of charge value and the minimum state of charge value of the single batteries in the battery module is used as one of the standards for whether the battery module enters the electric quantity balancing mode.
Specifically, a maximum state of charge value and a minimum state of charge value are determined from the calculated state of charge values of the single batteries, wherein the electric quantity of the single battery corresponding to the maximum state of charge value is the largest, and the electric quantity of the single battery corresponding to the minimum state of charge value is the smallest.
And then, the maximum charge state value and the minimum charge state value are subjected to difference to obtain a difference value of the maximum charge state value and the minimum charge state value.
Step S340, when it is determined that the difference is greater than the preset threshold and the operating state of each single battery meets the first trigger condition, controlling the enable of the equalization switch of one part of the single batteries first, and then controlling the enable of the equalization switch of another part of the single batteries to complete the electric quantity equalization of the battery module.
And comparing the obtained difference with a preset threshold, wherein if the preset threshold is set to be 1%, if the difference is greater than the preset threshold, it is indicated that the electric quantity difference between the single batteries is too large, and electric quantity balancing is very likely to be required, further judging whether the running states of the single batteries meet a first trigger condition, if so, firstly controlling the equalization switches of one part of the single batteries to enable, and then controlling the equalization switches of the other part of the single batteries to enable, so as to complete the electric quantity balancing of the battery module.
The setting of the first trigger condition can be set according to the requirement of the electric quantity balancing precision, if the conditions that the voltage of each single battery is smaller than the upper limit value of the balancing threshold value and the like are set, if the conditions are met, the battery module is controlled to enter an electric quantity balancing mode, specifically, the balancing switch of one part of the single batteries is controlled to enable, and then the balancing switch of the other part of the single batteries is controlled to enable, so that the electric quantity balancing of the battery module is completed.
The method described in fig. 3 shows that the method for balancing electric quantity provided by the application can take advantages of both active balancing and passive balancing, the method is simple in calculation structure and small in calculation amount, electric quantity transmission among the single batteries among the battery modules is considered, accuracy of electric quantity balancing of the single batteries and electric quantity balancing efficiency of the battery modules are remarkably improved, and burden of a main control circuit is greatly reduced.
In some embodiments of the present application, in the above method, controlling the enable of the balancing switch of one part of the single batteries first, and then controlling the enable of the balancing switch of another part of the single batteries to complete the power balancing of the battery module includes: and firstly, enabling the equalizing switches of the single batteries with odd numbers, and then enabling the equalizing switches of the single batteries with even numbers to finish the electric quantity equalization of the battery module.
In order to facilitate the control of each single battery, each single battery may be numbered, for example, as described above in nos. 1 to 24, after entering the electric quantity balancing mode, the balancing switches of the single batteries with odd numbers may be controlled to be enabled, and then the balancing switches of the single batteries with even numbers may be controlled to be enabled to complete the electric quantity balancing of the battery module.
In some embodiments of the present application, in the method described above, determining that the operating state of each unit cell satisfies the first trigger condition includes: under the condition that the voltage of each single battery is smaller than a first preset voltage, determining that the running state of each single battery meets a first trigger condition; and/or determining that the running state of each single battery meets the first trigger condition under the condition that the temperature of each single battery is smaller than the preset temperature.
The method comprises the steps that a first trigger condition can be set according to the requirement of the electric quantity balancing precision, if the first trigger condition is met, the electric quantity balancing is started, the specific trigger condition can be that the running state of each single battery is determined to meet the first trigger condition to be set under the condition that the voltage of each single battery is determined to be smaller than a first preset voltage, wherein the first preset voltage can be 3.3V of the upper limit value of a balancing voltage threshold value commonly adopted in the prior art; if it is determined that the temperature of each single battery is less than the preset temperature, determining that the operating state of each single battery meets a first trigger condition, where the preset temperature may be 75 ℃ which is an upper limit value of a temperature threshold generally adopted in the prior art, or combining the voltage and the temperature, that is, the conditions need to be met at the same time, for example, first determining whether the voltage of each single battery is less than a first preset voltage, and if it is determined that at least one of the voltages of each single battery is not less than the first preset voltage, not performing electric quantity equalization; if the voltage of each single battery is smaller than the first preset voltage, continuously judging whether the temperature of each single battery is smaller than the preset temperature, and if at least one of the temperatures of each single battery is not smaller than the preset temperature, not executing electric quantity equalization; and if the temperature of each single battery is determined to be less than the preset temperature, carrying out electric quantity equalization.
In some embodiments of the present application, the method further comprises: and under the condition that the difference value and/or the running state of each single battery meets the second triggering condition, determining that the electric quantity balance of the battery module is finished.
The method and the device for controlling the electric quantity balance further provide conditions for quitting the electric quantity balance process, namely the difference value and/or the running state of each single battery meet/meets the second triggering condition.
When the electric quantity balance is carried out to a certain degree, the current of the battery module, the voltage of the single battery and the temperature are changed, at the moment, the electric quantity balance effect can be judged to a certain degree, if the effect reaches the expected effect, the electric quantity balance mode can be quitted, and the normal operation mode is switched to.
Specifically, the judgment can be performed by the difference between the maximum state of charge value and the minimum state of charge value and the operating state of each single battery.
If the difference between the maximum state of charge value and the minimum state of charge value is smaller than or equal to the preset threshold, it is indicated that the electric quantity difference of each single battery is not large, and the difference is determined to meet a second trigger condition, namely, the battery module is controlled to exit the electric quantity balancing mode.
If the voltage of each single battery is determined to be less than or equal to a second preset voltage, determining that the running state of each single battery meets a second triggering condition; and/or determining that the running state of each single battery meets a second trigger condition under the condition that the temperature of each single battery is determined to be greater than or equal to the preset temperature.
The second preset voltage may be the same as or different from the first preset voltage, and preferably, the second preset voltage may be set to be 2.5V as in the present application.
The second trigger conditions may be set individually or in combination.
It should be noted that, since the control of the battery module to enter the electric quantity balancing mode and exit the balancing mode are different stages, the first trigger condition and the second trigger condition are compatible, and if the first preset voltage and the second preset voltage are not affected by each other, the situation that the battery module enters the electric quantity balancing mode and exits the balancing mode as the judgment result is not generated.
Fig. 4 is a schematic flow chart illustrating a method for balancing the power of the battery module according to another embodiment of the present application; firstly, the current I of the battery module, the voltage v (n) and the temperature temp (n) of each single battery are obtained, wherein n is the number of the single battery in the battery module, and n is 1,2, … and 24. Calculating the SOC (n) of each single battery in the battery module according to the current data I, the voltage V (n) and the temperature Temp (n) of the single battery; the maximum state of charge value max (SOC (n)) and the minimum state of charge value min (SOC (n)) are determined from the SOC (n) of each cell, and the difference between the maximum state of charge value max (SOC (n)) and the minimum state of charge value min (SOC (n)) is determined.
Judging whether the difference value is larger than a preset threshold value (the preset threshold value is 1%); if yes, enabling the electric quantity balance master control switch. Further, whether each single battery V (n) is smaller than a first preset voltage V is judgedH(VHIf yes, continuing to judge whether each single battery Temp (n) is less than the temperature threshold value TH(TH75 ℃), if yes, determining that the first trigger condition is met, and then controlling the odd-numbered monomerEnabling the equalization switches of the batteries, and then controlling the equalization switches of the single batteries with even numbers to enable; and if one of the first trigger conditions cannot be met, returning to the enabling step of the electric quantity balance master control switch, and judging again until the first trigger condition is met.
After the electric quantity balancing process is carried out for a period of time, whether the balancing process can be ended is judged, and specifically, whether each single battery V (n) is smaller than a second preset voltage V is judgedL(VL2.5V), if yes, further judging whether each single battery temp (n) is greater than or equal to the temperature threshold value TH(THAnd if the temperature is 75 ℃, judging whether the difference value is less than or equal to a preset threshold value (the preset threshold value is 1%), controlling the balance switches of the single batteries to be disconnected, and finishing the electric quantity balancing process. If one of the first trigger conditions cannot be met, the step of controlling the equalizing switch of the single battery with the odd number to enable first and then controlling the equalizing switch of the single battery with the even number to enable is returned, and the electric quantity equalization is continued until the second trigger condition is met.
Fig. 5 is a schematic structural diagram illustrating a power equalizing device of a battery module according to an embodiment of the present application, where the battery module includes a plurality of unit batteries connected in parallel, and the power equalizing device 500 includes:
the obtaining unit 510 is configured to obtain a current of the battery module and operation state information of each single battery, where the operation state information includes a voltage and a temperature of each single battery.
First, the current of the battery module, and the voltage and temperature of each unit battery are obtained.
In this embodiment, it is assumed that the number of the single cells is 24, and the voltage of each single cell is v (n) and the temperature temp (n), where n is the number of the single cell in the battery module, n is 1,2, …, and 24, and hereinafter, v (n) represents the voltage of the single cell with the number n.
Because the single batteries are connected in parallel, the currents at all positions of the battery module are equal; since the charge amount of each unit cell is different, the voltage and temperature of each unit cell are different.
The data processing unit 520 is used for determining the state of charge value of each single battery according to the current and the running state information; the method is used for determining the maximum state of charge value and the minimum state of charge value of the single batteries in the battery module according to the state of charge values of the single batteries and determining the difference value between the maximum state of charge value and the minimum state of charge value.
The State of Charge (SOC) of a battery is used to reflect the remaining capacity of the battery, which is numerically defined as the ratio of the remaining capacity to the battery capacity, expressed as a percentage. The SOC is 100% -DOD, the DOD is the battery discharge capacity, and the SOC is 100% to indicate that the battery is in a full charge state.
The SOC (state of charge) value of each single battery can be calculated or estimated according to the current, the voltage and the temperature of each single battery, wherein n is the serial number of the single battery in the battery module, and n is 1,2, … and 24. The calculation method may be any one of the prior art methods, such as an integral method.
In the present application, in order to balance the electric quantity between the single batteries, the electric quantity transmission between the single batteries is considered, and the difference between the maximum state of charge value and the minimum state of charge value of the single batteries in the battery module is used as one of the standards for whether the battery module enters the electric quantity balancing mode.
Specifically, a maximum state of charge value and a minimum state of charge value are determined from the calculated state of charge values of the single batteries, wherein the electric quantity of the single battery corresponding to the maximum state of charge value is the largest, and the electric quantity of the single battery corresponding to the minimum state of charge value is the smallest.
And then, the maximum charge state value and the minimum charge state value are subjected to difference to obtain a difference value of the maximum charge state value and the minimum charge state value.
And the control unit 530 is configured to, when it is determined that the difference is greater than the preset threshold and it is determined that the operating state of each single battery meets the first trigger condition, control enabling of the equalization switches of a part of single batteries first, and then control enabling of the equalization switches of another part of single batteries to complete electric quantity equalization of the battery module.
And comparing the obtained difference with a preset threshold, wherein if the preset threshold is set to be 1%, if the difference is greater than the preset threshold, it is indicated that the electric quantity difference between the single batteries is too large, and electric quantity balancing is very likely to be required, further judging whether the running states of the single batteries meet a first trigger condition, if so, firstly controlling the equalization switches of one part of the single batteries to enable, and then controlling the equalization switches of the other part of the single batteries to enable, so as to complete the electric quantity balancing of the battery module.
The setting of the first trigger condition can be set according to the requirement of the electric quantity balancing precision, if the conditions that the voltage of each single battery is smaller than the upper limit value of the balancing threshold value and the like are set, if the conditions are met, the battery module is controlled to enter an electric quantity balancing mode, specifically, the balancing switch of one part of the single batteries is controlled to enable, and then the balancing switch of the other part of the single batteries is controlled to enable, so that the electric quantity balancing of the battery module is completed.
The device shown in fig. 5 shows that the electric quantity balancing device provided by the application can take advantages of two modes of active balancing and passive balancing into account, the method is simple in calculation structure and small in calculation amount, electric quantity transmission among the single batteries among the battery modules is considered, accuracy of electric quantity balancing of the single batteries is remarkably improved, electric quantity balancing efficiency of the battery modules is improved, and burden of a main control circuit is greatly reduced.
In some embodiments of the present application, in the above-mentioned apparatus, the control unit 530 is configured to control the equalization switches of the odd-numbered cells to be enabled first, and then control the equalization switches of the even-numbered cells to be enabled, so as to complete the power equalization of the battery module.
In some embodiments of the present application, in the above apparatus, the control unit 530 is configured to determine that the operating state of each unit cell satisfies a first trigger condition when the voltage of each unit cell is determined to be less than a first preset voltage; and/or determining that the running state of each single battery meets the first trigger condition under the condition that the temperature of each single battery is smaller than the preset temperature.
In some embodiments of the present application, in the above-mentioned apparatus, the control unit 530 is further configured to determine that the power equalization of the battery module is finished if it is determined that the difference and/or the operating state of each battery cell satisfies the second trigger condition.
In some embodiments of the present application, in the above apparatus, the control unit 530 is configured to determine that the difference satisfies the second trigger condition if the difference is determined to be less than or equal to the preset threshold; and/or determining that the running state of each single battery meets a second trigger condition under the condition that the voltage of each single battery is less than or equal to a second preset voltage; and/or determining that the running state of each single battery meets a second trigger condition under the condition that the temperature of each single battery is determined to be greater than or equal to the preset temperature.
It should be noted that, for the specific implementation of each apparatus embodiment, reference may be made to the specific implementation of the corresponding method embodiment, which is not described herein again.
It should be noted that:
the algorithms and displays presented herein are not inherently related to any particular computer, virtual machine, or other apparatus. Various general purpose devices may be used with the teachings herein. The required structure for constructing such a device will be apparent from the description above. In addition, this application is not directed to any particular programming language. It will be appreciated that a variety of programming languages may be used to implement the teachings of the present application as described herein, and any descriptions of specific languages are provided above to disclose the best modes of the present application.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the application, various features of the application are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the application and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this application.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.
The various component embodiments of the present application may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functions of some or all of the components of the charge equalization apparatus of the battery module according to the embodiments of the present application. The present application may also be embodied as apparatus or device programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present application may be stored on a computer readable medium or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
For example, fig. 6 shows a schematic structural diagram of an electronic device according to an embodiment of the present application. The electronic device 600 comprises a processor 610 and a memory 620 arranged to store computer executable instructions (computer readable program code). The memory 620 may be an electronic memory such as a flash memory, an EEPROM (electrically erasable programmable read only memory), an EPROM, a hard disk, or a ROM. The memory 620 has a storage space 630 storing computer readable program code 631 for performing any of the method steps described above. For example, the memory space 630 for storing the computer readable program code may comprise respective computer readable program codes 631 for respectively implementing the various steps in the above method. The computer readable program code 631 may be read from or written to one or more computer program products. These computer program products comprise a program code carrier such as a hard disk, a Compact Disc (CD), a memory card or a floppy disk. Such a computer program product is typically a computer readable storage medium such as that shown in fig. 7. FIG. 7 shows a schematic diagram of a computer-readable storage medium according to an embodiment of the present application. The computer readable storage medium 700, in which a computer readable program code 631 for performing the method steps according to the application is stored, is readable by the processor 610 of the electronic device 600, which computer readable program code 631, when executed by the electronic device 600, causes the electronic device 600 to perform the respective steps of the method described above, in particular the computer readable program code 631 stored by the computer readable storage medium may perform the method shown in any of the embodiments described above. The computer readable program code 631 may be compressed in a suitable form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the application, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The application may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
Claims (10)
1. The utility model provides a method for balancing electric quantity of battery module, battery module includes a plurality of parallelly connected battery cell, its characterized in that includes:
acquiring the current of the battery module and the running state information of each single battery, wherein the running state information comprises the voltage and the temperature of each single battery;
determining the state of charge value of each single battery according to the current and the running state information;
determining the maximum state of charge value and the minimum state of charge value of the single batteries in the battery module according to the state of charge values of the single batteries, and determining the difference value between the maximum state of charge value and the minimum state of charge value;
and under the conditions that the difference value is larger than a preset threshold value and the running state of each single battery is determined to meet a first trigger condition, firstly controlling the enabling of the equalization switches of one part of the single batteries, and then controlling the enabling of the equalization switches of the other part of the single batteries so as to finish the electric quantity equalization of the battery module.
2. The method according to claim 1, wherein the controlling the equalization switches of a part of the single batteries to enable first and then controlling the equalization switches of another part of the single batteries to enable to complete the power equalization of the battery module comprises:
and firstly controlling the equalizing switches of the single batteries with odd numbers to enable, and then controlling the equalizing switches of the single batteries with even numbers to enable so as to complete the electric quantity equalization of the battery module.
3. The method according to claim 2, wherein the determining that the operating state of each of the unit batteries meets a first trigger condition comprises:
under the condition that the voltage of each single battery is smaller than a first preset voltage, determining that the running state of each single battery meets a first trigger condition;
and/or the presence of a gas in the gas,
and under the condition that the temperature of each single battery is smaller than the preset temperature, determining that the running state of each single battery meets a first trigger condition.
4. The method of claim 1, further comprising:
and under the condition that the difference and/or the running state of each single battery meets a second trigger condition, determining that the electric quantity balance of the battery module is finished.
5. The method of claim 4, wherein determining that the difference and/or the operating state of each of the cells satisfies a second trigger condition comprises:
determining that the difference value meets a second trigger condition under the condition that the difference value is determined to be less than or equal to a preset threshold value;
and/or the presence of a gas in the gas,
under the condition that the voltage of each single battery is determined to be less than or equal to a second preset voltage, determining that the running state of each single battery meets a second trigger condition; and/or determining that the running state of each single battery meets a second trigger condition under the condition that the temperature of each single battery is determined to be greater than or equal to the preset temperature.
6. The utility model provides an electric quantity balancing unit of battery module, battery module includes a plurality of parallelly connected battery cell, its characterized in that includes:
the battery module comprises an acquisition unit, a storage unit and a control unit, wherein the acquisition unit is used for acquiring the current of the battery module and the running state information of each single battery, and the running state information comprises the voltage and the temperature of each single battery;
the data processing unit is used for determining the state of charge value of each single battery according to the current and the running state information; the battery module is used for determining the maximum state of charge value and the minimum state of charge value of the single batteries in the battery module according to the state of charge values of the single batteries and determining the difference value between the maximum state of charge value and the minimum state of charge value;
and the control unit is used for controlling the enabling of the equalizing switches of one part of the single batteries and then controlling the enabling of the equalizing switches of the other part of the single batteries to finish the electric quantity equalization of the battery module under the conditions that the difference value is determined to be larger than the preset threshold value and the running state of each single battery is determined to meet the first triggering condition.
7. The device according to claim 6, wherein the control unit is configured to control the equalization switches of the odd-numbered cells to enable first, and then control the equalization switches of the even-numbered cells to enable, so as to complete the power equalization of the battery module.
8. The device of claim 7, wherein the control unit is configured to determine that the operating state of each of the single batteries meets a first trigger condition when the voltage of each of the single batteries is determined to be less than a first preset voltage;
and/or the presence of a gas in the gas,
and the control device is used for determining that the running state of each single battery meets a first trigger condition under the condition that the temperature of each single battery is smaller than a preset temperature.
9. The device according to claim 6, wherein the control unit is further configured to determine that the charge equalization of the battery module is finished if it is determined that the difference and/or the operating state of each of the single batteries meets a second trigger condition.
10. The device according to claim 9, wherein the control unit is configured to determine that the difference value satisfies a second trigger condition if it is determined that the difference value is less than or equal to a preset threshold value;
and/or the presence of a gas in the gas,
the control circuit is used for determining that the running state of each single battery meets a second trigger condition under the condition that the voltage of each single battery is less than or equal to a second preset voltage; and/or determining that the running state of each single battery meets a second trigger condition under the condition that the temperature of each single battery is determined to be greater than or equal to the preset temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110046218.0A CN112737056A (en) | 2021-01-14 | 2021-01-14 | Method and device for balancing electric quantity of battery module |
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| CN202110046218.0A CN112737056A (en) | 2021-01-14 | 2021-01-14 | Method and device for balancing electric quantity of battery module |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113659678A (en) * | 2021-08-17 | 2021-11-16 | 长沙优力电驱动系统有限公司 | Battery pack balance control method and device and battery pack balance system |
| CN113922464A (en) * | 2021-10-29 | 2022-01-11 | 蜂巢能源科技有限公司 | Balancing method and device for power battery system and electronic equipment |
| CN117293425A (en) * | 2023-11-24 | 2023-12-26 | 宁德时代新能源科技股份有限公司 | Battery module, battery, electricity utilization device and battery discharge control method |
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2021
- 2021-01-14 CN CN202110046218.0A patent/CN112737056A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113659678A (en) * | 2021-08-17 | 2021-11-16 | 长沙优力电驱动系统有限公司 | Battery pack balance control method and device and battery pack balance system |
| CN113922464A (en) * | 2021-10-29 | 2022-01-11 | 蜂巢能源科技有限公司 | Balancing method and device for power battery system and electronic equipment |
| CN117293425A (en) * | 2023-11-24 | 2023-12-26 | 宁德时代新能源科技股份有限公司 | Battery module, battery, electricity utilization device and battery discharge control method |
| CN117293425B (en) * | 2023-11-24 | 2024-04-19 | 宁德时代新能源科技股份有限公司 | Battery module, battery, electricity utilization device and battery discharge control method |
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