CN112737049B - Battery equalization control method and device and battery module - Google Patents
Battery equalization control method and device and battery module Download PDFInfo
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- CN112737049B CN112737049B CN202110004947.XA CN202110004947A CN112737049B CN 112737049 B CN112737049 B CN 112737049B CN 202110004947 A CN202110004947 A CN 202110004947A CN 112737049 B CN112737049 B CN 112737049B
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
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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
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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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- 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
Abstract
The invention discloses a battery equalization control method and device and a battery module. Wherein, the method comprises the following steps: acquiring the battery type, a preset capacity difference threshold value and the current residual capacity of a target battery; determining a voltage difference threshold according to the battery type, the preset capacity difference threshold and the current residual capacity; and controlling whether the target battery is balanced or not according to the voltage difference threshold value. According to the invention, more precise balancing can be realized, a better balancing effect can be obtained, and the difference among the batteries in the battery module is minimized.
Description
Technical Field
The invention relates to the technical field of energy storage equipment, in particular to a battery equalization control method and device and a battery module.
Background
Because of the difference between every two batteries, if no external equalization treatment exists, the problems of battery overcharge and overdischarge can occur in the later continuous use process, the service life of a battery system is influenced, and the battery system has potential safety hazards. Therefore, the equalization process is generally performed while the battery module is operating.
In the existing balancing method in the industry, only one voltage difference value is set, balancing is started when the voltage difference of the batteries reaches a set value, and when the remaining capacity of the same battery is different, the voltage difference corresponding to the same capacity difference is different and generally corresponds to a smaller voltage difference at a platform, so that only one fixed voltage difference threshold value is set, and the voltage difference threshold value is reached to start balancing, which results in poor balancing effect. Particularly, in the final stage of charge and discharge, when large current equalization is required for a short time, it is necessary to provide an equalization strategy that more conforms to the characteristics of the battery module.
Aiming at the problem of poor equalization effect caused by only setting a fixed voltage difference threshold in the equalization process in the prior art, no effective solution is 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 module, and aims to solve the problem that in the prior art, an equalization effect is poor due to the fact that only one fixed voltage difference threshold is set in an equalization process.
In order to solve the technical problem, the invention provides a battery equalization control method, wherein the method comprises the following steps:
acquiring the battery type, a preset capacity difference threshold value and the current residual capacity of a target battery;
determining a voltage difference threshold according to the battery type, the preset capacity difference threshold and the current residual capacity;
and controlling whether the target battery is balanced or not according to the voltage difference threshold value.
Further, determining a voltage difference threshold according to the battery type, the preset capacity difference threshold, and the current remaining capacity includes:
determining a capacity-voltage difference curve of a target battery according to the battery type and the preset capacity difference threshold value; wherein, the abscissa in the capacity-voltage difference curve is the residual capacity, and the ordinate is the voltage difference;
determining the voltage difference threshold according to the capacity-voltage difference curve and the current remaining capacity.
Further, determining the voltage difference threshold according to the capacity-voltage difference curve and the current remaining capacity includes:
finding a corresponding point on the capacity-voltage difference curve according to the current residual capacity;
and determining the ordinate of the corresponding point as a voltage difference threshold.
Further, before determining a capacity-voltage difference curve of the target battery according to the battery type and the preset capacity difference threshold, the method further includes:
measuring different types of batteries, and based on the change relation of voltage difference of different capacity differences along with the change of residual capacity;
and drawing a capacity-voltage difference curve according to the change relation of the voltage difference along with the residual capacity.
Further, controlling whether to balance the target battery according to the voltage difference threshold includes:
calculating the deviation between the voltage of the target battery and the average voltage value of all batteries in the battery module;
and controlling whether the target battery is balanced or not according to the magnitude relation between the deviation and the voltage difference threshold value.
Further, the preset capacity difference threshold comprises a first capacity difference threshold corresponding to a first voltage difference threshold,
controlling whether the target battery is balanced or not according to the magnitude relation between the deviation and the voltage difference threshold value, wherein the control method comprises the following steps:
triggering an equalization operation if the deviation is greater than or equal to a first voltage difference threshold;
if the deviation is less than the first voltage difference threshold, no equalization operation is triggered.
Further, the preset capacity difference threshold value further includes a second capacity difference threshold value, and the second capacity difference threshold value corresponds to a second voltage difference threshold value;
controlling whether to balance the target battery according to the magnitude relation between the deviation and the voltage difference threshold, and further comprising:
after the equalization operation is triggered, if the deviation is smaller than or equal to a second voltage difference threshold value, the equalization operation is triggered to stop;
and if the deviation is larger than the second voltage difference threshold value, continuing to perform the equalization operation.
The present invention also provides a battery equalization control apparatus, comprising:
the acquisition module is used for acquiring the battery type, the preset capacity difference threshold value and the current residual capacity of the target battery;
the determining module is used for determining a voltage difference threshold according to the battery type, the preset capacity difference threshold and the current residual capacity;
and the control module is used for controlling whether the target battery is balanced or not according to the voltage difference threshold value.
The invention also provides a battery module which comprises a plurality of target batteries and the battery balance 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, the battery type, the preset capacity difference threshold value and the current residual capacity of the target battery are obtained; determining a voltage difference threshold according to the battery type of the target battery, a preset capacity difference threshold and the current residual capacity; whether the target battery is balanced or not is controlled according to the voltage difference threshold, and compared with a scheme of setting a fixed voltage difference threshold, more precise balancing can be achieved, a better balancing effect is obtained, and the difference among batteries in the battery module is minimized.
Drawings
Fig. 1 is a flowchart of a battery equalization control method according to an embodiment of the present invention;
fig. 2 is a structural diagram of a battery equalization control apparatus according to an embodiment of the present invention;
fig. 3 is a structural view of a battery equalization control apparatus according to another embodiment of the present invention;
fig. 4 is a graph showing the variation of voltage difference with remaining capacity of four types of batteries when the capacity difference is 10% according to an embodiment of the present invention;
fig. 5 is a graph of the variation of the remaining capacity with different voltage differences for the same type of battery 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 scope 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 examples of the present 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 "a plurality" 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.
The words "if", as used herein, may be interpreted as "at \8230; \8230when" or "when 8230; \823030, when" 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 should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good 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 good 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 present 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:
s101, acquiring the battery type, the preset capacity difference threshold value and the current residual capacity of the target battery.
The battery type refers to the same kind of battery or different kinds of battery with different rated capacities, for example, a ternary battery with rated capacities of 9Ah, 30Ah, and 40Ah, which belongs to three different types of batteries, and a GRST battery belongs to another different type of battery. The preset capacity difference threshold is a preset value, and when the difference value between the capacity of the target battery and the average capacity of all batteries in the battery module is larger than the preset capacity difference threshold, it indicates that equalization is required, wherein the higher the requirement on the battery capacity precision is, the lower the preset capacity difference threshold is.
And S102, determining a voltage difference threshold according to the battery type of the target battery, a preset capacity difference threshold and the current residual capacity.
And S103, controlling whether the target battery is balanced or not by using the voltage difference threshold.
The voltage difference threshold is a critical value determined according to the parameters, wherein the critical value comprises at least one specific value, the critical value is used for controlling whether the target battery is balanced, and when the difference value between the voltage of the target battery and the average voltage of all batteries in the battery module reaches a preset capacity difference threshold, the balancing operation is controlled to be started or stopped.
According to the battery balance control method, the battery type of the target battery, the preset capacity difference threshold value and the current residual capacity are obtained; determining a voltage difference threshold according to the battery type of the target battery, a preset capacity difference threshold and the current residual capacity; and controlling whether the target battery is balanced or not according to the voltage difference threshold value. Compare in the scheme that sets up fixed voltage difference threshold value, can realize more meticulous equilibrium, obtain better balanced effect, make the difference minimizing between the battery in the battery module.
Example 2
In this embodiment, because different types of batteries have the same capacity difference, and the corresponding voltage differences under the same residual capacity are different, and the voltage differences of the same type of batteries based on the different capacity differences and the same residual capacity are also different, in order to accurately determine the voltage difference threshold, the step S102 specifically includes: determining a capacity-voltage difference curve of the target battery according to the battery type and a preset capacity difference threshold value; wherein, the abscissa in the capacity-voltage difference curve is the residual capacity, and the ordinate is the voltage difference; and determining a voltage difference threshold according to the capacity-voltage difference curve and the current residual capacity.
Specifically, determining the voltage difference threshold value according to the capacity-voltage difference curve and the current remaining capacity includes: finding a corresponding point on the capacity-voltage difference curve according to the current residual capacity; and determining the ordinate of the corresponding point as a voltage difference threshold value.
The above steps are performed on the premise that different types of batteries are obtained, and a variation curve of the voltage difference with the remaining capacity based on different capacity differences is obtained, so that before determining the capacity-voltage difference curve of the target battery according to the type of the battery and the preset capacity difference threshold, the method further comprises: measuring different types of batteries, and based on the change relation of voltage difference of different capacity differences along with the change of residual capacity; and drawing a capacity-voltage difference curve according to the change relation of the voltage difference along with the residual capacity.
For example, if the battery type is a 9Ah ternary battery, when the set capacity difference is 10%, the voltage variation corresponding to different residual capacities, for example, when the capacities are shifted up and down by 10% at 20%, 40%, 60% and 80%, is obtained, and a voltage difference curve of the 9Ah ternary battery at the capacity difference of 10% with the residual capacity is drawn according to the above data.
As described above, the voltage difference threshold is used to control whether to equalize the target battery, and therefore, the step S103 specifically includes: calculating the deviation between the voltage of the target battery and the average voltage value of all batteries in the battery module; and controlling whether the target battery is balanced or not according to the magnitude relation between the deviation and the voltage difference threshold value.
First, a time for starting to balance the target battery needs to be controlled, so that the preset capacity difference threshold includes a first capacity difference threshold, the first voltage difference threshold is determined based on the first capacity difference threshold, and whether to balance the target battery is controlled according to a magnitude relation between the deviation and the voltage difference threshold, which specifically includes: if the deviation is larger than or equal to a first voltage difference threshold value, triggering equalization operation; if the deviation is less than the first voltage difference threshold, the equalization operation is not triggered. The deviation is the absolute value of the difference between the voltage of the target battery and the average voltage of all the batteries in the battery module, and therefore, the deviation is always a positive value.
After the target battery is balanced, the time for stopping the balancing is required to be controlled, so that the preset capacity difference threshold value also comprises a second capacity difference threshold value, and the second voltage difference threshold value is determined based on the second capacity difference threshold value; controlling whether the target battery is balanced or not according to the magnitude relation between the deviation and the voltage difference threshold value, and further comprising: after the equalization operation is triggered, if the deviation is smaller than or equal to a second voltage difference threshold value, the equalization operation is triggered to stop; and if the deviation is larger than the second voltage difference threshold value, continuing to execute the equalization operation.
Example 3
In this embodiment, a battery balancing control apparatus is provided, and fig. 2 is a structural diagram of the battery balancing control apparatus according to the embodiment of the present invention, as shown in fig. 2, the apparatus includes:
the obtaining module 10 is configured to obtain a battery type of the target battery, a preset capacity difference threshold, and a current remaining capacity.
The battery type refers to the same kind of battery or different kinds of battery with different rated capacities, for example, a ternary battery with rated capacities of 9Ah, 30Ah and 40Ah may be used, and the battery type belongs to three different types of batteries, and the GRST battery belongs to another different type of battery. The preset capacity difference threshold is a preset value, and when the difference between the capacity of the target battery and the average capacity of all batteries in the battery module is greater than the preset capacity difference threshold, it indicates that equalization is required, wherein the higher the requirement on the battery capacity accuracy is, the lower the preset capacity difference threshold is.
And the determining module 20 is configured to determine the voltage difference threshold according to the battery type of the target battery, a preset capacity difference threshold, and the current remaining capacity.
And the control module 30 is configured to control whether to balance the target battery according to the voltage difference threshold.
The voltage difference threshold is a critical value determined according to the parameters, and includes at least one specific value, the value is used for controlling whether the target battery is balanced, and when the difference value between the voltage of the target battery and the average voltage of all batteries in the battery module reaches a preset capacity difference threshold, the voltage difference threshold is controlled to start to execute the balancing operation or stop the balancing operation.
The battery balance control device of the embodiment acquires the battery type, the preset capacity difference threshold value and the current residual capacity of the target battery through the acquisition module; determining a voltage difference threshold value according to the battery type of the target battery, a preset capacity difference threshold value and the current residual capacity through a determination module; and controlling whether the target battery is balanced or not according to the voltage difference threshold value through a control module. Compare in the scheme that sets up fixed voltage difference threshold value, can realize more meticulous equilibrium, obtain better balanced effect, make the difference minimizing between the battery in the battery module.
Example 4
In order to accurately determine the voltage difference threshold, the determining module 20 specifically includes: a first determining unit 201, configured to determine a capacity-voltage difference curve of the target battery according to the battery type and a preset capacity difference threshold; wherein, the abscissa in the capacity-voltage difference curve is the residual capacity, and the ordinate is the voltage difference; a second determining unit 202, configured to determine the voltage difference threshold according to the capacity-voltage difference curve and the current remaining capacity. The method is specifically used for: finding a corresponding point on the capacity-voltage difference curve according to the current residual capacity; and determining the ordinate of the corresponding point as the voltage difference threshold value.
The above steps are performed on the premise that different types of batteries have been obtained, and the variation curve of the voltage difference with the remaining capacity based on different capacity differences is obtained, so that before determining the capacity-voltage difference curve of the target battery according to the type of the battery and the preset capacity difference threshold, the above apparatus further comprises: the curve obtaining module 40 includes: an obtaining unit 401, configured to measure different types of batteries, based on a variation relationship between voltage differences of different capacity differences and remaining capacity; and a drawing unit 402, configured to draw a capacity-voltage difference curve according to a variation relationship between the voltage difference and the remaining capacity.
For example, if the battery type is a 9Ah ternary battery, when the set capacity difference is 10%, the voltage variation corresponding to different residual capacities, for example, when the capacities are shifted up and down by 10% at 20%, 40%, 60% and 80%, is obtained, and a voltage difference curve of the 9Ah ternary battery at the capacity difference of 10% with the residual capacity is drawn according to the above data.
As described above, the voltage difference threshold is used to control whether to balance the target battery, and therefore, the control module 30: which comprises the following steps: a calculating unit 301, configured to calculate a deviation between a voltage of a target battery and a voltage average value of all batteries in the battery module after determining a voltage difference threshold according to a battery type, a preset capacity difference threshold, and a current remaining capacity; a control unit 302, configured to control whether to balance the target battery according to the relationship between the deviation and the voltage difference threshold.
First, the control unit 302 needs to control a timing for starting equalization of the target battery, so that the preset capacity difference threshold includes a first capacity difference threshold, the first voltage difference threshold is determined based on the first capacity difference threshold, and the control unit 302 is specifically configured to: triggering an equalization operation when the deviation is greater than or equal to a first voltage difference threshold; if the deviation is less than the first voltage difference threshold, the equalization operation is not triggered. The deviation is the absolute value of the difference between the voltage of the target battery and the average voltage of all the batteries in the battery module, and therefore, the deviation is always a positive value.
After the control unit 302 starts to balance the target battery, it is necessary to control the time for stopping the balance, so that the preset capacity difference threshold further includes a second capacity difference threshold; the control unit 302 is further configured to: after the balance operation is triggered, when the deviation is smaller than or equal to a second voltage difference threshold value, triggering to stop the balance operation; and when the deviation is larger than the second voltage difference threshold value, continuing to perform the equalization operation.
Example 5
The present embodiment provides another battery equalization control method, including:
s1, obtaining a change curve of voltage difference of different types of batteries based on different capacity differences along with residual capacity.
In this embodiment, the different types of batteries refer to the same type of battery or different types of batteries with different rated capacities, for example, one of a ternary battery and a GRST battery with rated capacities of 9Ah, 30Ah, and 40Ah, respectively, may be selected, different capacity differences may be selected, and the curves of the voltage differences with the remaining capacity may be measured. For example, if the battery type is a 9Ah ternary battery, when the capacity difference is 10%, the voltage variation corresponding to different residual capacities is obtained, for example, when the capacity fluctuates by 10% from top to bottom at 20%, 40%, 60% and 80%, and a variation curve of the voltage difference of the 9Ah ternary battery with the residual capacity at the capacity difference of 10% is drawn according to the above data.
Fig. 4 is a graph showing the variation of the voltage difference with the remaining capacity of four types of batteries when the capacity difference is 10%, and as shown in fig. 4, the voltage differences corresponding to the same remaining capacity of different types of batteries are different based on the variation of the voltage difference with the remaining capacity made when the capacity difference is 10%, so that it is not very accurate to set only one equalizing voltage difference threshold value adopted in the industry. In the same way, the change curve of the voltage difference of the four batteries along with the residual capacity when the capacity difference is 9% and the capacity difference is 8% can be obtained. The above 10%, 9% or 8% is a ratio of the amount of change in the remaining capacity to the total capacity of the battery.
Fig. 5 is a graph showing a variation curve of different voltage differences with the remaining capacity of the same type of battery according to an embodiment of the present invention, and taking a battery with a model number of LTO-45A as an example, when the capacity differences are 10%, 9%, and 8%, respectively, the variation curves of the voltage differences with the remaining capacity are obtained, as shown in fig. 5, the voltage differences corresponding to the same remaining capacity based on the different capacity differences are also different for the same type of battery, so that during equalization, a dynamic voltage difference threshold needs to be set according to the variation curve of the voltage differences with the remaining capacity, and the equalization effect is improved.
And S2, setting a capacity difference threshold value delta SOC for triggering the equalization operation, and determining a voltage difference threshold value for triggering the equalization operation of the battery according to the capacity difference threshold value delta SOC.
For example, still taking the LTO-45A battery as an example, if the trigger capacity difference threshold is set to 10%, a variation curve of the voltage difference of the battery of the type with the remaining capacity at the capacity difference of 10% is found according to the type of the battery, and several points are arbitrarily taken on the curve, for example, points are taken at the remaining capacities of 20%, 40%, 60%, and 80%, and the voltage differences corresponding to the remaining capacities are 0.175V, 0.16V, 0.1897V, and 0.3795V, respectively. Therefore, the voltage difference thresholds are set to be 0.175V, 0.16V, 0.1897V, 0.3795V at the residual capacities of 20%, 40%, 60%, 80%, respectively, and when the difference between the voltage of the battery and the average voltage of the left and right batteries in the battery module reaches the above voltage difference threshold, the equalizing operation is performed,
if the capacity difference threshold value for stopping the equalizing operation is set to 8%, the corresponding voltage difference values are set according to the curve of the voltage difference with the remaining capacity at the capacity difference of 8%, as shown in fig. 2, points are taken at the remaining capacities of 20%, 40%, 60%, and 80%, respectively, and the voltage differences corresponding to the remaining capacities are 0.1432V, 0.1265V, 0.1581V, and 0.3162V, respectively, so that the voltage difference threshold values for stopping the equalizing operation are set to 0.1432V, 0.1265V, 0.1581V, and 0.3162V, respectively, at the remaining capacities of 20%, 40%, 60%, and 80%, respectively.
By the method, in the whole equalization process, the voltage difference threshold for triggering equalization operation and the voltage difference threshold for triggering the termination of equalization operation are dynamically set according to the change curve of the voltage difference along with the residual capacity, so that the method is more accurate and can obtain better equalization effect compared with the method for setting a single voltage difference threshold.
Example 6
The present embodiment provides a battery module, which includes a plurality of target batteries and further includes the above battery balancing control apparatus. The battery pack balancing method and device are used for achieving finer balancing, obtaining better balancing effect and minimizing difference among batteries in the battery module.
Example 7
The present embodiment provides a computer-readable storage medium on which a computer program is stored, the program, when executed by a processor, implementing the above-described battery equalization control method.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, 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 the present 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 (9)
1. A method for controlling battery equalization, the method comprising:
acquiring the battery type, a preset capacity difference threshold value and the current residual capacity of a target battery;
determining a voltage difference threshold according to the battery type, the preset capacity difference threshold and the current residual capacity; which comprises the following steps: determining a capacity-voltage difference curve of a target battery according to the battery type and the preset capacity difference threshold; wherein, the abscissa in the capacity-voltage difference curve is the residual capacity, and the ordinate is the voltage difference; determining the voltage difference threshold according to the capacity-voltage difference curve and the current remaining capacity;
and controlling whether the target battery is balanced or not according to the voltage difference threshold value.
2. The method of claim 1, wherein determining the voltage difference threshold from the capacity-voltage difference curve and the current remaining capacity comprises:
finding a corresponding point on the capacity-voltage difference curve according to the current residual capacity;
and determining the ordinate of the corresponding point as a voltage difference threshold value.
3. The method of claim 1, wherein before determining the capacity-voltage difference curve of the target battery according to the battery type and the preset capacity difference threshold, the method further comprises:
measuring different types of batteries, and based on the change relation of voltage difference of different capacity differences along with the change of residual capacity;
and drawing a capacity-voltage difference curve according to the change relation of the voltage difference along with the residual capacity.
4. The method of claim 1, wherein controlling whether to equalize the target battery according to the voltage difference threshold comprises:
calculating the deviation between the voltage of the target battery and the average voltage value of all batteries in the battery module;
and controlling whether the target battery is balanced or not according to the magnitude relation between the deviation and the voltage difference threshold value.
5. The method of claim 4, wherein the predetermined capacity difference threshold comprises a first capacity difference threshold, the first capacity difference threshold corresponding to a first voltage difference threshold,
controlling whether to balance the target battery or not according to the magnitude relation between the deviation and the voltage difference threshold value, wherein the control method comprises the following steps:
triggering an equalization operation if the deviation is greater than or equal to a first voltage difference threshold;
if the deviation is less than the first voltage difference threshold, no equalization operation is triggered.
6. The method of claim 5, wherein the preset capacity difference threshold further comprises a second capacity difference threshold, and the second capacity difference threshold corresponds to a second voltage difference threshold;
controlling whether the target battery is balanced or not according to the magnitude relation between the deviation and the voltage difference threshold value, and further comprising:
after the equalization operation is triggered, if the deviation is smaller than or equal to a second voltage difference threshold value, the equalization operation is triggered to stop;
and if the deviation is larger than the second voltage difference threshold value, continuing to perform the equalization operation.
7. A battery equalization control apparatus, characterized in that the apparatus comprises:
the acquisition module is used for acquiring the battery type, the preset capacity difference threshold and the current residual capacity of the target battery;
the determining module is used for determining a voltage difference threshold according to the battery type, the preset capacity difference threshold and the current residual capacity; the determining module comprises: the first determining unit is used for determining a capacity-voltage difference curve of the target battery according to the battery type and a preset capacity difference threshold value; wherein, the abscissa in the capacity-voltage difference curve is the residual capacity, and the ordinate is the voltage difference; a second determining unit for determining a voltage difference threshold according to the capacity-voltage difference curve and the current remaining capacity;
and the control module is used for controlling whether the target battery is balanced or not according to the voltage difference threshold value.
8. A battery module including a plurality of target batteries, wherein the battery module further includes the battery equalization control apparatus according to claim 7.
9. 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 6.
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| CN202110004947.XA CN112737049B (en) | 2021-01-04 | 2021-01-04 | Battery equalization control method and device and battery module |
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