CN115549257A - Battery equalization control method and device and battery pack - Google Patents
Battery equalization control method and device and battery pack Download PDFInfo
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- CN115549257A CN115549257A CN202211289115.8A CN202211289115A CN115549257A CN 115549257 A CN115549257 A CN 115549257A CN 202211289115 A CN202211289115 A CN 202211289115A CN 115549257 A CN115549257 A CN 115549257A
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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
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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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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Abstract
The invention discloses a battery equalization control method and device and a battery pack. Wherein, the method comprises the following steps: determining whether the single battery is in a quick charging working condition; if so, controlling the single batteries to carry out active equalization when the average value of the residual capacities of all the single batteries meets a first preset condition; and if not, controlling the single batteries to perform passive equalization when the average value of the residual capacities of all the single batteries meets a second preset condition. According to the invention, the active equalization mode and the passive equalization mode can be switched according to the working condition of the single battery, so that the respective advantages of the active equalization and the passive equalization are exerted, and the equalization effect and efficiency of the battery are improved.
Description
Technical Field
The invention relates to the technical field of electronic power, in particular to a battery equalization control method and device and a battery pack.
Background
In the energy storage system at the present stage, in order to ensure that the battery pack is more effectively full and fully discharged, the maximum available capacity of the battery is increased, the service life of the battery pack is prolonged, and the balance of each single battery of the battery pack is particularly important. The equalization method is mainly divided into passive equalization and active equalization. The passive equalization method is to release energy of a monomer with higher voltage in the battery pack through a resistor, and the energy is consumed through heat; the active equalization method is to realize the transfer of energy from a high-voltage monomer to a low-voltage monomer through a certain circuit topology. In consideration of energy utilization and heat dissipation, the passive equalization cannot realize equalization of large current, so that the equalization efficiency is low, the equalization is not suitable for the quick charging working condition, but the equalization is easy to realize and has low cost, and the equalization under other working conditions except the quick charging working condition can be realized; the active equalization can realize large-current equalization and is suitable for the quick charging working condition, but the control is complex, and the conventional battery pack cannot switch the active equalization mode and the passive equalization mode according to different working conditions.
Aiming at the problem that the battery pack in the prior art cannot switch the active equalization mode and the passive equalization mode according to different working conditions, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a battery equalization control method, a battery equalization control device and a battery pack, and aims to solve the problem that the battery pack in the prior art cannot switch an active equalization mode and a passive equalization mode according to different working conditions.
In order to solve the technical problem, the invention provides a battery equalization control method, wherein the method comprises the following steps:
determining whether the single battery is in a quick charging working condition;
if so, controlling the single batteries to carry out active equalization when the average value of the residual capacities of all the single batteries meets a first preset condition;
and if not, controlling the single batteries to perform passive equalization when the average value of the residual capacities of all the single batteries meets a second preset condition.
Further, the first preset condition is that: the first preset threshold is smaller than the residual capacity of the single battery and smaller than the second preset threshold.
Further, controlling the single battery to perform active equalization further comprises:
judging whether the difference value between the average value of the residual capacities of all the single batteries in the battery pack and the residual capacity of the single battery is larger than a charging threshold value or not;
and if so, controlling the single batteries to perform active charge equalization.
Further, controlling the single batteries to perform active balancing further comprises:
judging whether the difference value between the residual capacity of the single batteries and the average value of the residual capacities of all the single batteries in the battery pack is larger than a first discharge threshold value or not;
and if so, controlling the single batteries to carry out active discharge equalization.
Further, the second preset condition is that: the residual capacity of the single battery is larger than a first preset threshold value.
Further, the controlling the single batteries to perform passive equalization includes:
judging whether the difference value between the residual capacity of the single batteries and the average value of the residual capacities of all the single batteries in the battery pack is larger than a second discharge threshold value or not;
and if so, controlling the single batteries to perform passive discharge equalization.
Further, after controlling the single batteries to perform active equalization or controlling the single batteries to perform passive equalization, the method further includes:
calculating a deviation between the remaining capacity of each unit cell and an average value of the remaining capacities of all the unit cells;
judging whether the maximum value of the deviation is smaller than a preset deviation or not;
and if so, ending the active equalization or the passive equalization.
The invention also provides a battery equalization control device, which comprises:
the determining module is used for determining whether the single battery is in a quick charging working condition;
the first control module is used for controlling the single batteries to carry out active equalization when the single batteries are in a quick charging condition and the average value of the residual capacities of all the single batteries meets a first preset condition;
and the second control module is used for controlling the single batteries to carry out passive equalization when the single batteries are not in a quick charging condition and the average value of the residual capacities of all the single batteries meets a second preset condition.
The invention also provides a battery pack which comprises an active equalization control circuit, a passive equalization control circuit and the battery equalization control device.
The present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described battery equalization control method.
By applying the technical scheme of the invention, whether the single batteries are in a quick charging working condition is determined, if yes, the single batteries are controlled to carry out active equalization when the average value of the residual capacities of all the single batteries meets a first preset condition, and if not, the single batteries are controlled to carry out passive equalization when the average value of the residual capacities of all the single batteries meets a second preset condition. The active equalization mode and the passive equalization mode can be switched according to the working condition of the single battery, so that the respective advantages of the active equalization and the passive equalization are exerted, and the equalization effect and efficiency of the battery are improved.
Drawings
Fig. 1 is a flowchart of a battery equalization control method according to an embodiment of the present invention;
fig. 2 is a flowchart of a battery equalization control method according to another embodiment of the present invention;
fig. 3 is a block diagram showing the configuration of a battery equalization control apparatus according to an embodiment of the present invention;
fig. 4 is a structural view of a battery pack according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the description of the invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "the plural" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely a relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B, may represent: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter associated objects are in an "or" relationship.
It should be understood that although the terms first, second, etc. may be used to describe control modules in embodiments of the present invention, these control modules should not be limited to these terms. These terms are only used to distinguish between different control modules. For example, a first control module may also be referred to as a second control module, and similarly, a second control module may also be referred to as a first control module without departing from the scope of embodiments of the present invention.
The words "if", as used herein may be interpreted as "at \8230; \8230whenor" when 8230; \8230when or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrases "comprising one of \8230;" does not exclude the presence of additional like elements in an article or device comprising the element.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
The existing battery pack cannot switch an active equalization mode and a passive equalization mode according to different working conditions, and further cannot realize respective advantages of active equalization and passive equalization. To solve this problem, this embodiment provides a battery balancing control method, and fig. 1 is a flowchart of the battery balancing control method according to the embodiment of the present invention, as shown in fig. 1, the method includes:
and S101, determining whether the single battery is in a quick charging working condition.
The working conditions of the single battery comprise: the method comprises a quick charging working condition, a slow charging working condition, a mild discharging working condition and a standing working condition, wherein under the quick charging working condition, the charging current is large, the method is not suitable for adopting a passive equalization mode, only an active equalization mode can be adopted, and under other working conditions, the passive equalization mode can be adopted, so that the equalization control process is simplified, and therefore, the working condition of a single battery needs to be determined before the battery equalization control is carried out.
And S102, if so, controlling the single batteries to carry out active equalization when the average value of the residual capacities of all the single batteries meets a first preset condition.
And S103, if not, controlling the single batteries to perform passive equalization when the average value of the residual capacities of all the single batteries meets a second preset condition.
In the active equalization mode or the passive equalization mode, the single batteries have equalization protection thresholds, and the active equalization comprises active discharge equalization and active charge equalization, so that in the active equalization mode, the residual capacity of the single batteries needs to be provided with two protection thresholds to ensure that the residual capacity of the single batteries cannot be too high or too low; only passive discharge equalization is included in the passive equalization mode, so that a protection threshold needs to be set for the residual capacity of the battery in the active equalization mode, and the residual capacity of the single battery is not too low. Therefore, when the active equalization mode and the passive equalization mode are performed, the limitation on the remaining capacity of the unit battery is different.
The battery equalization control method of the embodiment firstly determines whether the single batteries are in a quick charging working condition, if so, the single batteries are controlled to carry out active equalization when the average value of the residual capacities of all the single batteries meets a first preset condition, and if not, the single batteries are controlled to carry out passive equalization when the average value of the residual capacities of all the single batteries meets a second preset condition. The active equalization mode and the passive equalization mode can be switched according to the working condition of the single battery, so that the respective advantages of the active equalization and the passive equalization are exerted, and the equalization effect and efficiency of the battery are improved.
As described above, in the active balancing mode, it is required to ensure that the residual capacity of the single battery cannot be too high or too low, so the first preset condition is: the first preset threshold value is smaller than the residual capacity of the single battery and smaller than the second preset threshold value.
In order to avoid the remaining capacity of the individual battery from being too low, the single battery is controlled to perform active equalization, and the method further comprises the following steps: judging whether the difference value between the average value of the residual capacities of all the single batteries in the battery pack and the residual capacity of the single battery is larger than a charging threshold value or not; and if so, controlling the single batteries to perform active charge equalization and charging the single batteries with excessively low residual capacity. And if not, not carrying out active charge equalization.
Similarly, in order to avoid the excess residual capacity of the individual batteries, the single batteries are controlled to be actively balanced, and the method further comprises the following steps: judging whether the difference value between the residual capacity of the single batteries and the average value of the residual capacities of all the single batteries in the battery pack is larger than a first discharge threshold value or not; and if so, controlling the single batteries to carry out active discharge equalization, and transferring the electric quantity of the single batteries with the over-high residual capacity to the single batteries with the over-low residual capacity.
As described above, in the passive equalization mode, it is sufficient to ensure that the remaining capacity of the single battery is not too low, and therefore, the second preset condition is: the residual capacity of the single battery is larger than a first preset threshold value.
The first preset threshold or the second preset threshold may be measured through experiments or set according to characteristics of different batteries.
In order to avoid the excess capacity of the individual batteries, the method for controlling the single batteries to perform passive equalization comprises the following steps:
judging whether the difference value between the residual capacity of the single batteries and the average value of the residual capacities of all the single batteries in the battery pack is larger than a second discharge threshold value or not; and if so, controlling the single batteries to perform passive discharge equalization.
The charging threshold, the first discharging threshold and the second discharging threshold may be obtained through experimental tests, or may be set according to characteristics of different batteries.
After the balancing process continues for a period of time, the remaining capacities of the single batteries tend to be balanced, but if the capacities of the single batteries are to be the same, the balancing process continues for a long time, and in order to improve the balancing efficiency and ensure the balancing effect, after the single batteries are controlled to perform active balancing, or after the single batteries are controlled to perform passive balancing, the method further includes: calculating a deviation between the remaining capacity of each unit cell and an average value of the remaining capacities of all the unit cells; judging whether the maximum value of the deviation is smaller than a preset deviation or not; if the equalization result is positive, the expected equalization effect is considered to be achieved, the active equalization mode or the passive equalization is ended, if the equalization result is negative, the expected equalization effect is not achieved, and the active equalization or the passive equalization is continuously kept. The deviation value and the preset deviation are positive values, and the preset deviation can be obtained through experimental tests.
Fig. 2 is a flowchart of a battery equalization control method according to another embodiment of the present invention, as shown in fig. 2, the method includes the following preferred steps:
s1, determining the working condition of the single battery.
S2, judging that 0.1 is less than the average value SOC of the residual capacities of all the single batteries Average If < 0.9, if yes, step S3 is performed, otherwise step S4 is performed. In order to ensure that the residual capacity of the single batteries is not too high or too low, when the average value SOC of the residual capacities of all the single batteries is Average When the residual capacity is less than or equal to 0.1, the starting of active discharge equalization is prohibited, and the average value SOC of the residual capacities of all the single batteries Average And when the charge voltage is greater than or equal to 0.9, the charge equalization is prohibited from being started. Wherein
S3, judging the average value SOC of the residual capacities of all the single batteries Average out -whether the remaining capacity SOCi > the charging threshold Δ SOC1 of the cell is established, if yes, step S4 is performed, if no, step S5 is performed.
And S4, controlling the single battery to carry out active charge equalization.
S5, judging the maximum value delta SOC of the deviation between the residual capacity of each single battery and the average value of the residual capacities of all the single batteries Max < cutoff threshold Δ SOC Cut-off And if the determination is not true, executing the step S13, and if the determination is not true, returning to the step S4. Wherein, Δ SOC Max ＝MAX{(SOC 1 -SOC Average out ),(SOC 2 -SOC Average ),Λ(SOC i -SOC Average out )}。
For example, when the battery pack is charged rapidly, the charging threshold Δ SOC1=0.05, the first discharging threshold Δ SOC2=0.05, Δ SOC may be set Cut-off ＝0.01。
S6, judging whether the average value SOC average of the residual capacities SOCi of the single batteries and the residual capacities of all the single batteries is larger than a first discharging threshold value delta SOC2 or not, if so, executing the step S6, and if not, returning to the step S2.
And S7, controlling the single batteries to carry out active discharge equalization.
S8, judging the residual capacity of each single battery and all the single batteriesMaximum value Δ SOC of deviation between average values of remaining capacities of batteries Max < cutoff threshold Δ SOC Cut-off If not, step S13 is executed, if yes, and if no, the process returns to step S7.
S9, judging that the average value SOC of the residual capacities of all the single batteries is more than 0.1 Average And if the determination is not true, executing the step S10, and if the determination is not true, returning to the step S9.
S10, judging the residual capacity SOCi of the single batteries-the average value SOC of the residual capacities of all the single batteries Average out If > second discharge threshold value Δ SOC3 is established, if yes, step S11 is executed, and if no, step S9 is returned to.
And S11, controlling the single batteries to perform passive discharge equalization.
S12, judging the maximum value delta SOC of the deviation between the residual capacity of each single battery and the average value of the residual capacities of all the single batteries Max < cutoff threshold Δ SOC Cut-off And if the determination is not true, executing the step S13, and if the determination is not true, returning to the step S11. Cutoff threshold Δ SOC Cut-off I.e. the predetermined deviation in the above embodiment.
For example, when the battery pack operating condition is slow charge/mild discharge/rest, the second discharge threshold Δ SOC2=0.03 and the cutoff threshold Δ SOC may be set Cut-off ＝0.01。
And S13, ending the balance control.
Example 2
This embodiment provides a battery equalization control device, and fig. 3 is a block diagram of a battery equalization control device according to an embodiment of the present invention, and as shown in fig. 3, the device includes:
the determination module 10 is used for determining whether the single battery is in a quick charging working condition.
The working conditions of the single battery comprise: under the quick charging condition, the charging current is large, the passive equalization mode is not suitable for being adopted, only the active equalization mode can be adopted, and under other conditions, the passive equalization mode can be adopted, so that the equalization control process is simplified, and therefore, the working condition of the single battery needs to be determined before the battery equalization control is carried out.
The first control module 20 is configured to control the single batteries to perform active equalization when the single batteries are in a fast charging condition and an average value of remaining capacities of all the single batteries meets a first preset condition.
The second control module 30 is configured to control the single batteries to perform passive equalization when the single batteries are not in the fast charging condition and an average value of remaining capacities of all the single batteries meets a second preset condition.
In the active equalization mode or the passive equalization mode, the single batteries have equalization protection thresholds, and the active equalization comprises active discharge equalization and active charge equalization, so that in the active equalization mode, the residual capacity of the single batteries needs to be provided with two protection thresholds to ensure that the residual capacity of the single batteries cannot be too high or too low; only passive discharge equalization is included in the passive equalization mode, so that a protection threshold needs to be set for the residual capacity of the battery in the active equalization mode, and the residual capacity of the single battery is not too low. Therefore, when the active equalization mode and the passive equalization mode are performed, the limitation on the remaining capacity of the unit battery is different.
The battery equalization control device of the embodiment determines whether the single batteries are in a fast charging condition through the determination module 10, the first control module 20 controls the single batteries to perform active equalization when the single batteries are in the fast charging condition and an average value of residual capacities of all the single batteries meets a first preset condition, and the second control module 30 controls the single batteries to perform passive equalization when the single batteries are not in the fast charging condition and the average value of residual capacities of all the single batteries meets a second preset condition. The active equalization mode and the passive equalization mode can be switched according to the working condition of the single battery, so that the respective advantages of the active equalization and the passive equalization are exerted, and the equalization effect and efficiency of the battery are improved.
As described above, in the active balancing mode, it is required to ensure that the residual capacity of the single battery cannot be too high or too low, so the first preset condition is: the first preset threshold is less than the residual capacity of the single battery and less than the second preset threshold.
In order to avoid that the remaining capacity of the individual battery is too low, the first control module 20 is specifically configured to: judging whether the difference value between the average value of the residual capacities of all the single batteries in the battery pack and the residual capacity of the single battery is larger than a charging threshold value or not; and if so, controlling the single batteries to perform active charge equalization and charging the single batteries with excessively low residual capacity. And if not, not carrying out active charge equalization.
Similarly, to avoid the excess capacity of the individual batteries, the first control module 20 is further specifically configured to: judging whether the difference value between the residual capacity of the single batteries and the average value of the residual capacities of all the single batteries in the battery pack is larger than a first discharge threshold value or not; and if so, controlling the single batteries to carry out active discharge equalization, and transferring the electric quantity of the single battery with the excessively high residual capacity to the single battery with the excessively low residual capacity.
As described above, in the passive equalization mode, it is only necessary to ensure that the remaining capacity of the single battery is not too low, and therefore, the second preset condition is: the residual capacity of the single battery is larger than a first preset threshold value.
In order to avoid excessive residual capacity of individual batteries, the second control module 30 is specifically configured to: judging whether the difference value between the residual capacity of the single batteries and the average value of the residual capacities of all the single batteries in the battery pack is larger than a second discharge threshold value or not; and if so, controlling the single batteries to perform passive discharge equalization.
After the balancing process continues for a period of time, the remaining capacities of the single batteries tend to be balanced, but if the capacities of each single battery are to be the same, the balancing process continues for a long time, and in order to improve the balancing efficiency while ensuring the balancing effect, the first control module 20 is further configured to: calculating the deviation between the residual capacity of each single battery and the average value of the residual capacities of the single batteries after controlling the single batteries to carry out active equalization; judging whether the maximum value of the deviation is smaller than a preset deviation or not; if so, the expected equalization effect is considered to be achieved, and the active equalization is ended; the second control module 20 is further configured to calculate a deviation between the remaining capacity of each cell and an average value of the remaining capacities of all the cells after controlling the cells to perform passive equalization; judging whether the maximum value of the deviation is smaller than a preset deviation or not; if yes, the expected equalization effect is considered to be achieved, and the passive equalization is finished.
Example 3
The present embodiment provides a battery pack, fig. 4 is a structural diagram of the battery pack according to the embodiment of the present invention, as shown in fig. 4, the battery pack includes an active equalization control circuit 1 and a passive equalization control circuit 2, the active control circuit includes a DC/DC converter and switches S0 to S5 for controlling the single batteries to perform active discharge equalization or active charge equalization, the passive equalization control circuit 2 performs passive discharge equalization through a resistor, and the switch tube is connected in series with the resistor for controlling whether the resistor is turned on, and further includes a battery equalization control device (not shown in the figure) implemented as above. The method is used for switching the active equalization mode and the passive equalization mode according to the working condition of the single battery, so that the respective advantages of the active equalization and the passive equalization are exerted, and the equalization effect and efficiency of the battery are improved.
Example 4
The present embodiment provides a computer-readable storage medium on which a computer program is stored, which when executed by a processor implements the above-described battery equalization control method.
The above-described embodiments of the apparatus are merely illustrative, wherein the modules described as separate parts may or may not be physically separate, and the parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment may be implemented by software plus a necessary general hardware platform, and may also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for controlling battery equalization, the method comprising:
determining whether the single battery is in a quick charging working condition;
if so, controlling the single batteries to carry out active equalization when the average value of the residual capacities of all the single batteries meets a first preset condition;
and if not, controlling the single batteries to perform passive equalization when the average value of the residual capacities of all the single batteries meets a second preset condition.
2. The method according to claim 1, wherein the first preset condition is: the first preset threshold is smaller than the residual capacity of the single battery and smaller than the second preset threshold.
3. The method of claim 1, wherein controlling the cells for active equalization further comprises:
judging whether the difference value between the average value of the residual capacities of all the single batteries in the battery pack and the residual capacity of the single battery is larger than a charging threshold value or not;
and if so, controlling the single batteries to perform active charge equalization.
4. The method of claim 1, wherein controlling the cells for active equalization further comprises:
judging whether the difference value between the residual capacity of the single batteries and the average value of the residual capacities of all the single batteries in the battery pack is larger than a first discharge threshold value or not;
and if so, controlling the single batteries to carry out active discharge equalization.
5. The method according to claim 1, wherein the second preset condition is: the residual capacity of the single battery is larger than a first preset threshold value.
6. The method of claim 1, wherein controlling the cells for passive equalization comprises:
judging whether the difference value between the residual capacity of the single batteries and the average value of the residual capacities of all the single batteries in the battery pack is larger than a second discharge threshold value or not;
and if so, controlling the single batteries to perform passive discharge equalization.
7. The method according to claim 1, wherein after controlling the cells for active equalization or controlling the cells for passive equalization, the method further comprises:
calculating a deviation between the remaining capacity of each unit cell and an average value of the remaining capacities of all the unit cells;
judging whether the maximum value of the deviation is smaller than a preset deviation or not;
and if so, ending the active equalization or the passive equalization.
8. A battery equalization control apparatus, characterized in that the apparatus comprises:
the determining module is used for determining whether the single battery is in a quick charging working condition;
the first control module is used for controlling the single batteries to carry out active equalization when the single batteries are in a quick charging condition and the average value of the residual capacities of all the single batteries meets a first preset condition;
and the second control module is used for controlling the single batteries to carry out passive equalization when the single batteries are not in a quick charging condition and the average value of the residual capacities of all the single batteries meets a second preset condition.
9. A battery pack comprising an active equalization control circuit and a passive equalization control circuit, and further comprising the battery equalization control apparatus of claim 8.
10. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method according to any one of claims 1 to 7.
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| CN202211289115.8A Pending CN115549257A (en) | 2022-10-20 | 2022-10-20 | Battery equalization control method and device and battery pack |
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| Country | Link |
|---|---|
| CN (1) | CN115549257A (en) |
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2022
- 2022-10-20 CN CN202211289115.8A patent/CN115549257A/en active Pending
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