CN109756001B - Electric automobile, battery system and balancing method and device thereof - Google Patents
Electric automobile, battery system and balancing method and device thereof Download PDFInfo
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- CN109756001B CN109756001B CN201910190206.8A CN201910190206A CN109756001B CN 109756001 B CN109756001 B CN 109756001B CN 201910190206 A CN201910190206 A CN 201910190206A CN 109756001 B CN109756001 B CN 109756001B
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The invention discloses an electric automobile, a battery system, and a balancing method and a balancing device thereof, wherein the balancing method of the battery system comprises the following steps: acquiring the average cell voltage of a battery system; determining single batteries needing to be balanced in a battery system; calculating the difference value between the monomer voltage of the monomer battery to be balanced and the average monomer voltage to obtain difference voltage; converting the difference voltage into a difference capacity; and performing charge and discharge control on the single batteries needing to be balanced according to the difference capacity. According to the balancing method of the battery system, the single batteries needing balancing in the battery system can be accurately and efficiently balanced, and the operation is simple.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a battery system balancing method, a battery system balancing device, a battery system and an electric automobile.
Background
The battery system (power battery system) of the electric automobile is generally formed by connecting a plurality of single batteries in series and in parallel, and the larger the electric quantity is, the more the number of the required single batteries is.
Generally, in the process of charging and discharging the single battery, part of electricity is converted into heat energy. The difference of the internal resistance of the single batteries, the difference of the battery cores when the battery cores are grouped, the difference of the assembly process, the difference of the positions of the battery cores in the module and other reasons cause different heat production of the single batteries in the charging and discharging process. Therefore, after the battery system is used for a long time, the voltage difference between the single batteries is gradually increased, and the available energy of the battery system is reduced due to the barrel effect, so that the driving range of the electric automobile is reduced, and further, the use of an owner is negatively influenced.
In the related art, a corresponding balancing strategy is adopted to balance the battery cells needing balancing so as to solve the problem of the battery imbalance. However, the equalization strategy is interfered by factors such as external environment, conditions such as over-equalization or under-equalization are easy to occur, the equalization effect is not easy to control, so that the battery cannot be accurately equalized, and the equalization efficiency is low.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, a first object of the present invention is to provide an equalization method for a battery system, which can accurately and efficiently equalize the cells requiring equalization in the battery system, and is simple in operation.
A second object of the present invention is to provide an equalizing device for a battery system.
A third object of the present invention is to provide a battery system.
The fourth purpose of the invention is to provide an electric automobile.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides an equalization method for a battery system, including: acquiring an average cell voltage of the battery system; determining the single batteries needing to be balanced in the battery system; calculating the difference value between the monomer voltage of the monomer battery to be balanced and the average monomer voltage to obtain difference voltage; converting the difference voltage into a difference capacity; and performing charge and discharge control on the single batteries needing to be balanced according to the difference capacity.
According to the balancing method of the battery system, the average monomer voltage of the battery system is obtained, the monomer battery needing to be balanced in the battery system is determined, the difference value between the monomer voltage of the monomer battery needing to be balanced and the average monomer voltage is calculated to obtain the difference voltage, the difference voltage is converted into the difference capacity, and the charge and discharge control is carried out on the monomer battery needing to be balanced according to the difference capacity, so that the monomer battery needing to be balanced in the battery system can be accurately and efficiently balanced, and the operation is simple.
In addition, the equalization method of the battery system according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the controlling charging and discharging the single battery needing to be balanced according to the difference capacity includes: determining the balance current and the balance time according to the difference capacity; and performing charge and discharge control on the single batteries needing to be balanced according to the balancing current and the balancing time.
According to an embodiment of the invention, said converting said difference voltage into a difference capacity comprises: and determining the difference capacity corresponding to the difference voltage according to the difference voltage and a pre-established corresponding relation between the difference voltage and the difference capacity.
According to one embodiment of the invention, the determining the single battery needing equalization in the battery system comprises the following steps: and determining the single battery needing to be balanced according to the single voltage of each single battery in the battery system and the average single voltage.
According to an embodiment of the present invention, the determining the single battery needing equalization according to the cell voltage of each single battery in the battery system and the average cell voltage includes: calculating the absolute value of the difference between the cell voltage of each cell and the average cell voltage; and determining the single battery with the absolute value of the difference larger than a set threshold as the single battery needing to be balanced.
In order to achieve the above object, an embodiment of a second aspect of the present invention provides an equalizing device for a battery system, including: the acquisition module is used for acquiring the average cell voltage of the battery system; the determining module is used for determining the single batteries needing to be balanced in the battery system; the calculation module is used for calculating the difference value between the single voltage of the single battery needing to be balanced and the average single voltage to obtain difference voltage; the conversion module is used for converting the difference voltage into difference capacity; and the control module is used for performing charge and discharge control on the single batteries needing to be balanced according to the difference capacity.
According to the equalizing device of the battery system, the average monomer voltage of the battery system is obtained through the obtaining module, the monomer battery needing to be equalized in the battery system is determined through the determining module, the difference value between the monomer voltage of the monomer battery needing to be equalized and the average monomer voltage is calculated through the calculating module to obtain the difference voltage, the difference voltage is converted into the difference capacity through the converting module, and the charging and discharging control is carried out on the monomer battery needing to be equalized through the control module according to the difference capacity, so that the monomer battery needing to be equalized in the battery system can be accurately and efficiently equalized, and the operation is simple.
In addition, the equalizing device of the battery system according to the above-described embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the control module is specifically configured to: determining the balance current and the balance time according to the difference capacity; and performing charge and discharge control on the single batteries needing to be balanced according to the balancing current and the balancing time.
According to an embodiment of the present invention, the conversion module is specifically configured to: and determining the difference capacity corresponding to the difference voltage according to the difference voltage and a pre-established corresponding relation between the difference voltage and the difference capacity.
In order to achieve the above object, a battery system according to a third embodiment of the present invention includes a plurality of single batteries and an equalizing device of the battery system according to the second embodiment of the present invention.
According to the battery system provided by the embodiment of the invention, the single batteries needing to be balanced in the battery system can be accurately and efficiently balanced through the balancing device of the battery system, and the operation is simple.
In order to achieve the above object, a fourth aspect of the present invention provides an electric vehicle including the battery system according to the third aspect of the present invention.
According to the electric automobile provided by the embodiment of the invention, the single batteries needing to be balanced in the battery system can be accurately and efficiently balanced through the battery system, and the operation is simple.
Drawings
Fig. 1 is a flowchart of an equalization method of a battery system according to an embodiment of the present invention;
fig. 2 is a block schematic diagram of an equalizing device of a battery system according to an embodiment of the present invention;
FIG. 3 is a block schematic diagram of a battery system according to an embodiment of the invention;
fig. 4 is a block schematic diagram of an electric vehicle according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The following describes an equalization method of a battery system, an equalization apparatus of a battery system, and an electric vehicle according to an embodiment of the present invention with reference to the drawings.
At present, aiming at the problem of unbalance of single batteries in a battery system, a balancing strategy based on difference comparison of static voltages is generally adopted to balance the single batteries needing to be balanced in the battery system. Specifically, the balancing policy may include: in the working process of the battery system, the single batteries needing to be balanced are screened and positioned through data, the static average voltage of all the single batteries is calculated, the static voltage of the single batteries needing to be balanced is compared with the static average voltage, and the single batteries needing to be balanced are charged or discharged through the balancing and power supplementing equipment according to the comparison result, so that the static voltage of the single batteries is balanced into a static average voltage value.
The balance electricity supplementing device displays the dynamic voltage of the single battery in the charging/discharging process of the single battery, certain deviation exists between the dynamic voltage and the static voltage when the single battery is charged/discharged, the dynamic voltage is larger than the static voltage when the single battery is charged, and the dynamic voltage is smaller than the static voltage when the single battery is discharged. Therefore, in the process of equalizing the unit cells, when the dynamic voltage of the unit cells is adjusted to the static average voltage, it is difficult to ensure that the static voltage of the unit cells is also adjusted to the static average voltage.
Therefore, in the actual operation process, it is necessary to empirically set an upper limit voltage value for equalization, stop equalization when the dynamic voltage of the unit cell reaches the upper limit voltage value, and compare with the static average voltage after a certain period of time (30 minutes, or 1 hour) to determine the equalization result.
However, the above-mentioned equalization strategy uses the dynamic voltage as the judgment condition for the equalization end, and the dynamic voltage and the static voltage have no corresponding relationship, so when the equalization strategy is interfered by factors such as external environment, the situation of over-equalization and under-equalization is easy to occur, the equalization effect is not easy to control, the battery cannot be accurately equalized, and the equalization efficiency is low. Therefore, the invention provides the balancing method of the battery system, which can accurately and efficiently balance the single batteries needing balancing in the battery system and is simple to operate.
Fig. 1 is a flowchart of an equalization method of a battery system according to an embodiment of the present invention. As shown in fig. 1, an equalization method for a battery system according to an embodiment of the present invention may include:
and S1, acquiring the average cell voltage of the battery system.
Specifically, during the operation of the battery system, the voltage distribution of all the unit cells in the battery system at the battery discharge end, i.e., V1, V2, …, Vn, may be obtained and the average value thereof may be calculated to obtain the average unit voltage of the battery system
Namely, it is
And S2, determining the single batteries needing to be balanced in the battery system.
According to one embodiment of the invention, the method for determining the single battery needing equalization in the battery system comprises the following steps: and determining the single batteries needing to be balanced according to the single voltage and the average single voltage of each single battery in the battery system.
According to one embodiment of the invention, determining the single battery needing to be balanced according to the single voltage and the average single voltage of each single battery in the battery system comprises the following steps: calculating the absolute value of the difference value between the single voltage and the average single voltage of each single battery; and determining the single battery with the absolute value of the difference larger than a set threshold value as the single battery needing to be balanced.
Specifically, in practical applications, the deviation between the cell voltage of each cell in the battery system and the average cell voltage can be determined according to the cell voltage and the average cell voltage of each cell in the battery system, so as to determine the cells that need to be balanced. And if the deviation of the single voltage of the single battery in the battery system is large, determining that the single battery needs to be balanced.
As a possible implementation manner, the deviation between the cell voltage of each cell and the average cell voltage in the battery system may be determined according to the absolute value of the difference between the cell voltage of each cell and the average cell voltage, so as to determine the cell that needs to be balanced. When the absolute value of the difference value between the cell voltage of the single cell and the average cell voltage is greater than a set threshold value, the difference between the cell voltage of the single cell and the average cell voltage is larger, and therefore the single cell needs to be balanced; when the absolute value of the difference value between the cell voltage of the single cell and the average cell voltage is smaller than a set threshold value, it is indicated that the deviation between the cell voltage of the single cell and the average cell voltage is smaller, and therefore it is determined that the single cell does not need to be balanced.
It should be noted that, in addition to determining the single battery to be balanced according to the absolute value of the difference between the single voltage and the average single voltage of each single battery, the single battery to be balanced may also be determined according to the ratio between the single voltage and the average single voltage of each single battery. When the ratio of the cell voltage of the single cell to the average cell voltage is greater than a first preset value or smaller than a second preset value, it is indicated that the deviation between the cell voltage of the single cell and the average cell voltage is large, and therefore it is determined that the single cell needs to be balanced; when the ratio of the cell voltage of the single cell to the average cell voltage is greater than the second preset value and smaller than the first preset value, it is indicated that the deviation between the cell voltage of the single cell and the average cell voltage is small, and therefore it is determined that the single cell does not need to be balanced.
And S3, calculating the difference between the cell voltage of the single cell needing to be balanced and the average cell voltage to obtain the difference voltage.
And S4, converting the difference voltage into difference capacity.
According to one embodiment of the invention, converting the difference voltage to a difference capacity comprises: and determining the differential capacity corresponding to the differential voltage according to the differential voltage and a pre-established corresponding relation between the differential voltage and the differential capacity.
Specifically, in general, when a voltage of a battery changes during charge and discharge, the capacity of the battery also changes accordingly, that is, the voltage and the capacity of the battery have a certain relationship. Therefore, standard charging and discharging data of different single batteries in a laboratory can be counted in advance, and the corresponding relation between the differential voltage and the differential capacity of the different single batteries is established according to the standard charging and discharging data of the different single batteries. Therefore, when calculating the difference voltage between the cell voltage of the cell to be balanced and the average cell voltage, the corresponding relationship between the difference voltage and the difference capacity of the cell can be used to convert the difference voltage into the difference capacity.
That is to say, when the single batteries needing to be balanced are balanced, the standard charging and discharging data of the single batteries in a laboratory can be directly called, and the data source has no cost input, so that the cost for balancing the single batteries is greatly reduced.
And S5, performing charge and discharge control on the single batteries needing to be balanced according to the difference capacity.
According to one embodiment of the invention, the charge and discharge control of the single batteries needing to be balanced according to the difference capacity comprises the following steps: determining the balance current and the balance time according to the difference capacity; and performing charge and discharge control on the single batteries needing to be balanced according to the balance current and the balance time.
Specifically, the differential capacity of the unit cell has a certain relationship with an equalization current (i.e., a current required for equalizing the unit cell requiring equalization) and an equalization time (i.e., a time required for equalizing the unit cell requiring equalization). Under the condition of a certain equalizing current, the larger the capacity difference of the single batteries is, the larger the equalizing time is, and the smaller the capacity difference of the single batteries is, the smaller the equalizing time is; under the condition of a certain balancing time, the larger the capacity difference of the single batteries is, the larger the balancing current is, and the smaller the capacity difference of the single batteries is, the smaller the balancing current is. Therefore, the charge and discharge control of the single batteries needing to be balanced can be performed according to the balance current and the balance time.
In order to accurately control the equalization time in actual operation, a constant current mode may be adopted, that is, the charge and discharge control may be performed on the cells requiring equalization while maintaining the equalization current.
Therefore, the embodiment of the invention provides an equalization strategy based on standard charging and discharging experimental data of single batteries in a laboratory, the difference voltage between the single voltage of the single battery to be equalized and the average single voltage is calculated, the difference voltage is converted into the difference capacity according to the standard charging and discharging experimental data, and the equalization power supply equipment is controlled to work in a constant current mode.
In summary, according to the balancing method of the battery system in the embodiment of the present invention, the average cell voltage of the battery system is obtained, the cell to be balanced in the battery system is determined, the difference between the cell voltage of the cell to be balanced and the average cell voltage is calculated to obtain the difference voltage, the difference voltage is converted into the difference capacity, and the charge and discharge control is performed on the cell to be balanced according to the difference capacity, so that the cell to be balanced in the battery system can be accurately and efficiently balanced, and the operation is simple.
Fig. 2 is a block schematic diagram of an equalizing apparatus of a battery system according to an embodiment of the present invention. As shown in fig. 2, the balancing apparatus 100 of the battery system according to the embodiment of the present invention may include an acquisition module 1000, a determination module 2000, a calculation module 3000, a conversion module 4000, and a control module 5000.
The obtaining module 1000 is configured to obtain an average cell voltage of the battery system; the determining module 2000 is configured to determine the single batteries needing to be balanced in the battery system; the calculation module 3000 is configured to calculate a difference between the cell voltage of the cell to be balanced and the average cell voltage to obtain a difference voltage; the conversion module 4000 is used for converting the difference voltage into difference capacity; the control module 5000 is configured to perform charge and discharge control on the single batteries needing to be balanced according to the difference capacity.
According to an embodiment of the present invention, the control module 5000 is specifically configured to: determining the balance current and the balance time according to the difference capacity; and performing charge and discharge control on the single batteries needing to be balanced according to the balance current and the balance time.
According to one embodiment of the present invention, the conversion module 4000 is specifically configured to: and determining the differential capacity corresponding to the differential voltage according to the differential voltage and a pre-established corresponding relation between the differential voltage and the differential capacity.
It should be noted that, for details that are not disclosed in the equalizing device of the battery system according to the embodiment of the present invention, please refer to details that are disclosed in the equalizing method of the battery system according to the embodiment of the present invention, and detailed descriptions thereof are omitted here.
According to the equalizing device of the battery system, the average monomer voltage of the battery system is obtained through the obtaining module, the monomer battery needing to be equalized in the battery system is determined through the determining module, the difference value between the monomer voltage of the monomer battery needing to be equalized and the average monomer voltage is calculated through the calculating module to obtain the difference voltage, the difference voltage is converted into the difference capacity through the converting module, and the charging and discharging control is carried out on the monomer battery needing to be equalized through the control module according to the difference capacity, so that the monomer battery needing to be equalized in the battery system can be accurately and efficiently equalized, and the operation is simple.
In addition, the embodiment of the invention also provides a battery system. As shown in fig. 3, the battery system 10 according to the embodiment of the present invention may include a plurality of unit batteries 200 and the above-described balancing device 100 of the battery system.
According to the balancing device of the battery system, the single batteries needing to be balanced in the battery system can be accurately and efficiently balanced through the balancing device of the battery system, and the operation is simple.
In addition, the embodiment of the invention also provides an electric automobile. As shown in fig. 4, the electric vehicle 1 according to the embodiment of the present invention may include the battery system 10 described above.
According to the electric automobile provided by the embodiment of the invention, the single batteries needing to be balanced in the battery system can be accurately and efficiently balanced through the battery system, and the operation is simple.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In addition, in the description of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (8)
1. A method of balancing a battery system, comprising:
acquiring the average cell voltage of the battery system, wherein in the working process of the battery system, the voltage distribution of all the cells in the battery system at the battery discharge end is acquired, and the average cell voltage of the battery system is acquired according to the voltage distribution;
determining the single batteries needing to be balanced in the battery system;
calculating the difference value between the monomer voltage of the monomer battery to be balanced and the average monomer voltage to obtain difference voltage;
converting the difference voltage into a difference capacity;
according to the difference capacity, performing charge-discharge control on the single batteries needing to be balanced;
converting the difference voltage into a difference capacity includes:
determining the differential capacity corresponding to the differential voltage according to the differential voltage and a pre-established correspondence between the differential voltage and the differential capacity,
establishing a corresponding relation between differential voltage and differential capacity of different single batteries according to standard charging and discharging data of different single batteries;
and calculating standard charging and discharging data of the different single batteries in the laboratory in advance.
2. The balancing method according to claim 1, wherein the controlling of charging and discharging the single battery to be balanced according to the difference capacity comprises:
determining the balance current and the balance time according to the difference capacity;
and performing charge and discharge control on the single batteries needing to be balanced according to the balancing current and the balancing time.
3. The balancing method according to claim 1, wherein the determining the single battery needing balancing in the battery system comprises:
and determining the single battery needing to be balanced according to the single voltage of each single battery in the battery system and the average single voltage.
4. The equalizing method according to claim 3, wherein the determining the single battery to be equalized according to the cell voltage of each single battery in the battery system and the average cell voltage comprises:
calculating the absolute value of the difference between the cell voltage of each cell and the average cell voltage;
and determining the single battery with the absolute value of the difference larger than a set threshold as the single battery needing to be balanced.
5. An equalizing device of a battery system, comprising:
the battery management system comprises an acquisition module, a storage module and a control module, wherein the acquisition module is used for acquiring the average cell voltage of the battery system, acquiring the voltage distribution of all the cells in the battery system at the battery discharging tail end in the working process of the battery system, and acquiring the average cell voltage of the battery system according to the voltage distribution;
the determining module is used for determining the single batteries needing to be balanced in the battery system;
the calculation module is used for calculating the difference value between the single voltage of the single battery needing to be balanced and the average single voltage to obtain difference voltage;
the conversion module is used for converting the difference voltage into difference capacity;
the control module is used for controlling charging and discharging of the single batteries needing to be balanced according to the difference capacity;
the conversion module is specifically configured to: determining the difference capacity corresponding to the difference voltage according to the difference voltage and a pre-established corresponding relation between the difference voltage and the difference capacity, wherein the corresponding relation between the difference voltage and the difference capacity of different single batteries is established according to standard charging and discharging data of the different single batteries; and calculating standard charging and discharging data of the different single batteries in the laboratory in advance.
6. The equalizing device of claim 5, wherein the control module is specifically configured to:
determining the balance current and the balance time according to the difference capacity;
and performing charge and discharge control on the single batteries needing to be balanced according to the balancing current and the balancing time.
7. A battery system, comprising: a balancing device for a plurality of battery cells and a battery system as claimed in any one of claims 5 to 6.
8. An electric vehicle, comprising: the battery system of claim 7.
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| CN111313117A (en) * | 2020-03-27 | 2020-06-19 | 华霆（合肥）动力技术有限公司 | Lossless passive equalization method and device for battery module and battery system |
| CN111469712A (en) * | 2020-05-08 | 2020-07-31 | 广州小鹏汽车制造有限公司 | Battery equalization method and device and vehicle |
| CN115360793B (en) * | 2022-09-15 | 2024-06-11 | 湖北亿纬动力有限公司 | Battery pack equalization method, device, battery system and storage medium |
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