CN111211594B - Complementary equalization control method, circuit and storage medium considering temperature and SOH - Google Patents
Complementary equalization control method, circuit and storage medium considering temperature and SOH Download PDFInfo
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- CN111211594B CN111211594B CN202010002533.9A CN202010002533A CN111211594B CN 111211594 B CN111211594 B CN 111211594B CN 202010002533 A CN202010002533 A CN 202010002533A CN 111211594 B CN111211594 B CN 111211594B
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 5
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
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Abstract
The embodiment of the invention provides a complementary type equalization control method, a complementary type equalization control system and a storage medium taking temperature and SOH into consideration, and belongs to the technical field of equalization circuits. The method comprises the following steps: acquiring an OCV-SOC curve of each single battery of the battery pack; determining a first SOC value of each single battery; charging fixed electric quantity into each single battery respectively; determining a second SOC value of each single battery according to the current open-circuit voltage of each single battery; calculating the full capacity of each single battery according to the formula (1); acquiring the temperature of each single battery; determining the actual full capacity of each single battery according to the temperature-capacity table of each single battery; calculating the actual available capacity of the single battery according to the actual full capacity and the first SOC value; determining a capacity difference of the battery pack; judging whether the capacity difference is larger than a preset threshold value or not; and under the condition that the capacity difference is judged to be larger than the threshold value, charging the monomer battery with the smallest practical available capacity until the capacity difference is smaller than or equal to the preset threshold value.
Description
Technical Field
The invention relates to the technical field of equalization circuits, in particular to a complementary equalization control method, a complementary equalization control circuit and a storage medium taking temperature and SOH into consideration.
Background
The application of the high-capacity lithium battery pack in new energy automobiles and energy storage systems is becoming wider and wider. Because of the differences of the production, manufacture and use environments of the lithium battery monomers, along with the increase of the use time, the inconsistency among the lithium battery monomers can be increased to influence the exertion of the effective capacity of the battery, so that an equalization circuit is required to equalize the lithium battery monomers, and the difference among the capacities of the lithium batteries is improved.
The equalization schemes adopted at present are various, including passive equalization of resistance energy consumption type, active equalization of power supply type, active equalization of energy transfer type among batteries and the like, and the equalization schemes always judge the conditions of equalization on and off according to the voltage of the battery cells, but the mode has certain defects. The initial difference in battery production and the environment difference in the subsequent use process lead to inconsistent attenuation degree of each single battery in the battery pack, so that the difference exists in full capacity, meanwhile, in the actual operation process of the battery pack, the temperature actually positioned by the battery pack possibly has the difference due to different installation positions, and the available capacity of each single battery is influenced, so that the voltage or the SOC of each single battery of the whole battery pack is inconsistent with the actual available capacity, and the single battery voltage or the SOC is adopted as a judgment condition, so that the single battery with the lowest electric quantity is actually balanced, and the performance exertion of the whole battery pack is influenced.
Disclosure of Invention
The embodiment of the invention aims to provide a complementary equalization control method, a circuit and a storage medium taking temperature and SOH into consideration. The method, the circuit and the storage medium can improve the consistency of the battery pack after equalization.
In order to achieve the above object, an embodiment of the present invention provides a complementary equalization control method considering temperature and SOH, the method including:
acquiring an OCV-SOC curve of each single battery of the battery pack;
determining a first SOC value of each single battery according to the current open-circuit voltage of each single battery;
charging fixed electric quantity into each single battery respectively;
determining a second SOC value of each single battery according to the current open-circuit voltage of each single battery;
the full capacity of each single battery is calculated according to the formula (1),
wherein C is 0 For the full capacity, ΔC is the fixed charge, SOC 1 For the first SOC value, SOC 2 Is the second SOC value;
acquiring the temperature of each single battery;
determining the actual full capacity of each single battery according to a temperature-capacity table of each single battery;
calculating the actual available capacity of the single battery according to the actual full capacity and the first SOC value;
determining the capacity difference between the single battery with the largest actual available capacity and the single battery with the smallest actual available capacity in the battery pack;
judging whether the capacity difference is larger than a preset threshold value or not;
and under the condition that the capacity difference is larger than the threshold value, charging the single battery with the smallest actual available capacity until the capacity difference is smaller than or equal to the preset threshold value.
Optionally, determining the actual full capacity of each of the unit cells according to the temperature-capacity table of each of the unit cells specifically includes:
determining the temperature coefficient of the single battery at the current temperature according to the temperature-capacity table;
determining said actual full capacity according to equation (2),
C 1 ＝λC 0 ， (2)
wherein C is 1 For the actual full capacity, C 0 Lambda is the temperature coefficient for the full capacitance.
On the other hand, the invention also provides a complementary equalization circuit considering temperature and SOH, which comprises:
a charging power supply for charging each unit cell of the battery pack;
the equalization switch is connected between the charging power supply and the single battery;
a controller for:
acquiring an OCV-SOC curve of each single battery of the battery pack;
determining a first SOC value of each single battery according to the current open-circuit voltage of each single battery;
charging fixed electric quantity into each single battery respectively;
determining a second SOC value of each single battery according to the current open-circuit voltage of each single battery;
the full capacity of each single battery is calculated according to the formula (1),
wherein C is 0 For the full capacity, ΔC is the fixed charge, SOC 1 For the first SOC value, SOC 2 Is the second SOC value;
acquiring the temperature of each single battery;
determining the actual full capacity of each single battery according to a temperature-capacity table of each single battery;
calculating the actual available capacity of the single battery according to the actual full capacity and the first SOC value;
determining the capacity difference between the single battery with the largest actual available capacity and the single battery with the smallest actual available capacity in the battery pack;
judging whether the capacity difference is larger than a preset threshold value or not;
and under the condition that the capacity difference is larger than the threshold value, controlling to close an equalization switch corresponding to the single battery with the smallest actual available capacity to charge until the capacity difference is smaller than or equal to the preset threshold value.
Optionally, the controller is further configured to:
determining the temperature coefficient of the single battery at the current temperature according to the temperature-capacity table;
determining said actual full capacity according to equation (2),
C 1 ＝λC 0 ， (2)
wherein C is 1 For the actual full capacity, C 0 Lambda is the temperature coefficient for the full capacitance.
Optionally, the equalization switch includes:
the first sub-switch comprises a plurality of first interfaces and a plurality of second interfaces which are connected in a one-to-one correspondence manner, and each first interface is used for being connected with the positive electrode or the negative electrode of the single battery;
and the first end and the second end of each second sub-switch are alternately connected with the second interface, the third end is connected with one end of the charging power supply, and the fourth end is connected with the other end of the charging power supply.
Optionally, the equalizing circuit further includes an isolation unit connected between the charging power source and the equalizing switch.
Optionally, the controller obtains the open circuit voltage and temperature through a battery management system.
In yet another aspect, the present invention also provides a storage medium storing instructions for reading by a machine to cause the machine to perform a method as described above.
According to the technical scheme, the temperature and SOH-considered complementary equalization control method, circuit and storage medium provided by the invention combine the temperature and current capacity of the single battery when the SOC of the single battery is measured, so that the measured SOC is more accurate, and then the equalization control method is executed according to the measured SOC, so that the technical problem of poor equalization effect caused by the fact that the temperature, SOH and other factors are not considered when the equalization circuit executes equalization operation in the prior art is solved, and the consistency of the single battery after equalization is improved.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain, without limitation, the embodiments of the invention. In the drawings:
FIG. 1 is a flow chart of a method of complementary equalization control taking into account temperature and SOH according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a complementary equalization circuit that accounts for temperature and SOH according to an embodiment of the present invention; and
fig. 3 is a schematic diagram of a complementary equalization circuit that accounts for temperature and SOH in accordance with an embodiment of the present invention.
Detailed Description
The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
In the embodiments of the present invention, unless otherwise indicated, terms of orientation such as "upper, lower, top, bottom" are used generally with respect to the orientation shown in the drawings or with respect to the positional relationship of the various components with respect to one another in the vertical, vertical or gravitational directions.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
FIG. 1 is a flow chart of a method of complementary equalization control taking into account temperature and SOH according to an embodiment of the present invention
In step S10, an OCV-SOC curve of each unit cell of the battery pack is acquired. The OCV-SOC curve is used to represent a correspondence between an open circuit voltage and a SOC (State Of charge) Of the battery.
In step S11, a first SOC value of each unit cell is determined according to the current open circuit voltage of each unit cell.
In step S12, each unit cell is charged with a fixed amount of electricity, respectively.
In step S13, determining a second SOC value of each unit cell again according to the current open circuit voltage of each unit cell;
in step S14, the full capacity of each unit cell is calculated according to formula (1) respectively,
wherein C is 0 For full capacity, ΔC is a fixed amount of electricity, SOC 1 For the first SOC value, SOC 2 Is a second SOC value;
in step S15, the temperature of each unit cell is acquired;
in step S16, the actual full capacity of each unit cell is determined according to the temperature-capacity table of each unit cell. Specifically, the temperature coefficient of the single battery at the current temperature can be determined according to the temperature-capacity table; and then determining the actual full capacity according to the formula (2),
C 1 ＝λC 0 ， (2)
wherein C is 1 To actually fill the capacitance, C 0 For full capacitance, λ is the temperature coefficient.
In step S17, the actual available capacity of the unit battery is calculated based on the actual full capacity and the first SOC value. Specifically, the actual available capacity may be calculated according to equation (3),
C 2 ＝C 1 SOC 1 ， (3)。
in step S18, determining a capacity difference between the cell having the largest actual available capacity and the cell having the smallest actual available capacity in the battery pack;
in step S19, it is determined whether the capacity difference is greater than a preset threshold;
in step S20, in the case where it is determined that the capacity difference is greater than the threshold value, the cell whose actual available capacity is the smallest is charged until the capacity difference is less than or equal to the preset threshold value.
On the other hand, the present invention also provides a complementary equalization circuit considering temperature and SOH, as shown in fig. 2, which may include a charging power supply U, an equalization switch S, and a controller (not shown in the drawing), where the charging power supply U may be used to charge each unit cell B of the battery pack BT. The equalization switch S may be connected between the charging power supply U and the unit battery B. The controller may be configured to obtain an OCV-SOC curve for each cell B of the battery BT; determining a first SOC value of each single battery B according to the current open-circuit voltage of each single battery B; charging fixed electric quantity into each single battery B respectively; determining a second SOC value of each single battery B according to the current open-circuit voltage of each single battery B; the full capacity of each unit cell B is calculated according to formula (1) respectively,
wherein C is 0 For full capacity, ΔC is a fixed amount of electricity, SOC 1 For the first SOC value, SOC 2 Is a second SOC value; acquiring the temperature of each single battery B; determining the actual full capacity of each single battery B according to the temperature-capacity table of each single battery B; calculating the actual available capacity of the single battery B according to the actual full capacity and the first SOC value; determining in a battery packThe cell B with the largest actual available capacity is poor in capacity from the cell B with the smallest actual available capacity; judging whether the capacity difference is larger than a preset threshold value or not; and under the condition that the capacity difference is larger than the threshold value, controlling to close an equalization switch S corresponding to the single battery B with the smallest practical available capacity to charge until the capacity difference is smaller than or equal to the preset threshold value.
In this embodiment, in determining the actual available capacity, the controller may first determine the temperature coefficient of the unit cell at the current temperature according to the temperature-capacity table; and then determining the actual full capacity according to the formula (2),
C 1 ＝λC 0 ， (2)
wherein C is 1 To actually fill the capacitance, C 0 For full capacitance, λ is the temperature coefficient.
In one embodiment of the present invention, as shown in fig. 2, the equalization switch S may further include a first sub-switch S1 and a second sub-switch S2. The first sub-switch S1 may include a plurality of first interfaces and a plurality of second interfaces connected in one-to-one correspondence, each first interface being used for connecting with the positive electrode or the negative electrode of the unit cell B; the first end and the second end of each second sub-switch S2 can be alternately connected with the second interface, the third end is connected with one end of the charging power supply U, and the fourth end is connected with the other end of the charging power supply U.
In one embodiment of the present invention, as shown in fig. 3, the equalization circuit may further include an isolation unit 01. The isolation unit 01 may be connected between the charging power supply U and the equalization switch S.
In addition, the design cost of the circuit is reduced, and the controller can acquire the open circuit voltage and the temperature through the battery management system.
In yet another aspect, the present invention also provides a storage medium having stored thereon instructions which can be used to be read by a machine to cause the machine to perform a method as described above.
According to the technical scheme, the temperature and SOH-considered complementary equalization control method, circuit and storage medium provided by the invention combine the temperature and current capacity of the single battery when the SOC of the single battery is measured, so that the measured SOC is more accurate, and then the equalization control method is executed according to the measured SOC, so that the technical problem of poor equalization effect caused by the fact that the temperature, SOH and other factors are not considered when the equalization circuit executes equalization operation in the prior art is solved, and the consistency of the single battery after equalization is improved.
The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the embodiments of the present invention are not limited to the specific details of the foregoing embodiments, and various simple modifications may be made to the technical solutions of the embodiments of the present invention within the scope of the technical concept of the embodiments of the present invention, and all the simple modifications belong to the protection scope of the embodiments of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the various possible combinations of embodiments of the invention are not described in detail.
Those skilled in the art will appreciate that all or part of the steps in implementing the methods of the embodiments described above may be implemented by a program stored in a storage medium, including instructions for causing a (which may be a single-chip microcomputer, a chip or the like) or processor (processor) to perform all or part of the steps of the methods of the embodiments described herein. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In addition, any combination of the various embodiments of the present invention may be made between the various embodiments, and should also be regarded as disclosed in the embodiments of the present invention as long as it does not deviate from the idea of the embodiments of the present invention.
Claims (6)
1. A complementary equalization control method taking temperature and SOH into account, the method comprising:
acquiring an OCV-SOC curve of each single battery of the battery pack;
determining a first SOC value of each single battery according to the current open-circuit voltage of each single battery;
charging fixed electric quantity into each single battery respectively;
determining a second SOC value of each single battery according to the current open-circuit voltage of each single battery;
the full capacity of each single battery is calculated according to the formula (1),
wherein C is 0 For the full capacity, ΔC is the fixed charge, SOC 1 For the first SOC value, SOC 2 Is the second SOC value;
acquiring the temperature of each single battery;
determining the actual full capacity of each single battery according to a temperature-capacity table of each single battery;
calculating the actual available capacity of the single battery according to the actual full capacity and the first SOC value;
determining the capacity difference between the single battery with the largest actual available capacity and the single battery with the smallest actual available capacity in the battery pack;
judging whether the capacity difference is larger than a preset threshold value or not;
charging the single battery with the smallest actual available capacity until the capacity difference is smaller than or equal to the preset threshold value under the condition that the capacity difference is larger than the threshold value;
the determining the actual full capacity of each single battery according to the temperature-capacity table of each single battery specifically comprises:
determining the temperature coefficient of the single battery at the current temperature according to the temperature-capacity table;
determining said actual full capacity according to equation (2),
C 1 ＝λC 0 ，(2)
wherein C is 1 For the actual full capacity, C 0 Lambda is the temperature coefficient for the full capacitance.
2. A complementary equalization circuit taking temperature and SOH into account, the equalization circuit comprising:
a charging power supply for charging each unit cell of the battery pack;
the equalization switch is connected between the charging power supply and the single battery;
a controller for:
acquiring an OCV-SOC curve of each single battery of the battery pack;
determining a first SOC value of each single battery according to the current open-circuit voltage of each single battery;
charging fixed electric quantity into each single battery respectively;
determining a second SOC value of each single battery according to the current open-circuit voltage of each single battery;
the full capacity of each single battery is calculated according to the formula (1),
wherein C is 0 For the full capacity, ΔC is the fixed charge, SOC 1 For the first SOC value, SOC 2 Is the second SOC value;
acquiring the temperature of each single battery;
determining the actual full capacity of each single battery according to a temperature-capacity table of each single battery;
calculating the actual available capacity of the single battery according to the actual full capacity and the first SOC value;
determining the capacity difference between the single battery with the largest actual available capacity and the single battery with the smallest actual available capacity in the battery pack;
judging whether the capacity difference is larger than a preset threshold value or not;
under the condition that the capacity difference is larger than the threshold value, controlling to close an equalization switch corresponding to the single battery with the smallest actual available capacity to charge until the capacity difference is smaller than or equal to the preset threshold value;
the controller is further configured to:
determining the temperature coefficient of the single battery at the current temperature according to the temperature-capacity table;
determining said actual full capacity according to equation (2),
C 1 ＝λC 0 ，(2)
wherein C is 1 For the actual full capacity, C 0 Lambda is the temperature coefficient for the full capacitance.
3. The equalization circuit of claim 2, wherein the equalization switch comprises:
the first sub-switch comprises a plurality of first interfaces and a plurality of second interfaces which are connected in a one-to-one correspondence manner, and each first interface is used for being connected with the positive electrode or the negative electrode of the single battery;
and the first end and the second end of each second sub-switch are alternately connected with the second interface, the third end is connected with one end of the charging power supply, and the fourth end is connected with the other end of the charging power supply.
4. The equalization circuit of claim 2, further comprising an isolation unit connected between the charging power source and the equalization switch.
5. The equalization circuit of claim 2, wherein the controller obtains the open circuit voltage and temperature via a battery management system.
6. A storage medium storing instructions for reading by a machine to cause the machine to perform the method of claim 1.
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| CN111799856B (en) * | 2020-06-05 | 2024-05-24 | 力高(山东)新能源技术股份有限公司 | Method and system for passive equalization of new energy automobile battery management system |
| CN115877238B (en) * | 2022-12-06 | 2023-11-07 | 北汽福田汽车股份有限公司 | Method and device for detecting battery capacity, readable storage medium and electronic equipment |
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