CN117811168B - Battery power limiting method, device, management system, device and storage medium - Google Patents
Battery power limiting method, device, management system, device and storage medium Download PDFInfo
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- CN117811168B CN117811168B CN202410219508.4A CN202410219508A CN117811168B CN 117811168 B CN117811168 B CN 117811168B CN 202410219508 A CN202410219508 A CN 202410219508A CN 117811168 B CN117811168 B CN 117811168B
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000010438 heat treatment Methods 0.000 claims abstract description 114
- 230000033228 biological regulation Effects 0.000 claims abstract description 23
- 239000000110 cooling liquid Substances 0.000 claims description 48
- 238000001816 cooling Methods 0.000 claims description 12
- 238000004146 energy storage Methods 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 11
- 238000005057 refrigeration Methods 0.000 claims description 11
- 238000004590 computer program Methods 0.000 claims description 7
- 239000012809 cooling fluid Substances 0.000 claims description 3
- 230000020169 heat generation Effects 0.000 claims description 3
- 239000002826 coolant Substances 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 1
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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 embodiment of the application provides a battery power limiting method, a device, a management system, equipment and a storage medium, and relates to the technical field of battery management. The method comprises the following steps: the battery management system accumulates a first duration representing a duration of the battery management system in the power regulation mode after entering the power regulation mode according to the temperature of the battery core of the battery pack, and accumulates a second duration representing a duration of the battery pack output peak power based on the discharge actual power of the battery pack at each moment; determining the allowable maximum heating power and the allowable peak power output duration of the battery pack according to the operation mode of the equipment where the battery pack is located; and at each moment, determining whether to enter a power reduction mode or not by using the maximum allowable heating power, the maximum allowable peak power output time length, the current accumulated first time length and the current accumulated second time length so as to limit the maximum charge and discharge peak power of the battery pack, thereby avoiding power limitation by only depending on temperature data and improving the accuracy and rationality of the power limitation.
Description
Technical Field
The present application relates to the field of battery management technologies, and in particular, to a battery power limiting method, device, management system, device, and storage medium.
Background
SOP estimation is one of the key technologies of battery management, and is used for determining the charge-discharge peak power of a battery pack, and the estimation of the value is unreasonable, so that the battery is easy to overcharge and overdischarge, and the service life of the battery is reduced.
The existing SOP strategies take the battery core temperature and the SOC of the battery pack as inputs, and the corresponding algorithm only has the temperature data of the single battery, so that the temperature rise trend cannot be calculated from the whole angle, and therefore reasonable power limitation cannot be given.
Disclosure of Invention
The embodiment of the application provides a battery power limiting method, a device, a management system, equipment and a storage medium, which can avoid power limitation by only depending on temperature data and improve the accuracy and rationality of power limitation.
The technical scheme of the embodiment of the application can be realized as follows:
In a first aspect, an embodiment of the present application provides a battery power limiting method applied to a battery management system, where the battery management system is electrically connected to a battery pack, the method includes:
After entering a power regulation mode according to the cell temperature of the battery pack, determining the allowable maximum heating power and the allowable peak power output duration of the battery pack according to the operation mode of equipment where the battery pack is positioned;
Determining whether to enter a power-down mode to limit the maximum charge-discharge peak power of the battery pack at each moment by using the maximum allowable heating power, the allowable peak power output duration and the first and second currently accumulated durations, wherein the first duration is accumulated by the battery management system after entering the power adjustment mode, the first duration is the duration that the battery management system is in the power adjustment mode, the second duration is the duration that the battery management system is accumulated based on the discharge actual power of the battery pack at each moment after entering the power adjustment mode, and the second duration is the duration that the battery pack outputs the peak power.
Optionally, the step of determining whether to enter the power down mode using the allowable maximum heating power, the allowable peak power output time period, and the current accumulated first and second time periods includes:
Acquiring the current heating power and cooling liquid refrigerating power of the battery pack under the condition that the current accumulated second time length is longer than the allowable peak power output time length and the current discharging actual power of the battery pack is smaller than the preset discharging continuous power of the battery pack or under the condition that the current accumulated second time length is longer than twice the allowable peak power output time length;
And determining whether to enter the power reduction mode according to the maximum allowable heating power, the current accumulated first duration, the current heating power of the battery pack and the current cooling power of the cooling liquid.
Optionally, the step of determining whether to enter the power-down mode according to the allowable maximum heating power, the current accumulated first duration, and the current heating power and cooling liquid cooling power of the battery pack includes:
Integrating the current accumulated first time length by utilizing the current heating power of the battery pack to obtain first heating energy of the battery pack;
integrating the current accumulated first time length by utilizing the current cooling liquid refrigerating power of the battery pack to obtain first cooling liquid refrigerating energy of the battery pack;
Integrating the current accumulated first time length by utilizing the current maximum allowable heating power to obtain the first maximum allowable heating energy of the battery pack;
And determining whether to enter the power reduction mode according to the first heating energy, the first cooling liquid refrigeration energy and the first allowable maximum heating energy.
Optionally, the step of determining whether to enter the power-down mode according to the heating energy, the cooling liquid refrigeration energy and the allowable maximum heating energy includes:
And if the difference value between the first heating energy and the refrigerating energy of the first cooling liquid is larger than the product of a first preset coefficient and the first allowable maximum heating energy, entering the power reduction mode.
Optionally, the method further comprises:
After entering the power-down mode, acquiring the latest heating power and cooling liquid refrigerating power of the battery pack at each moment;
Integrating the latest accumulated first time length by utilizing the latest heating power of the battery pack to obtain second heating energy of the battery pack;
Integrating the latest accumulated first time length by utilizing the latest cooling liquid refrigerating power of the battery pack to obtain second cooling liquid refrigerating energy of the battery pack;
Integrating the latest accumulated first time length by utilizing the latest allowable maximum heating power to obtain a second allowable maximum heating energy of the battery pack;
Determining whether to exit the power reduction mode according to the second heating energy, the second cooling liquid refrigerating energy and the second allowable maximum heating energy, resetting the first duration and the second duration to be zero when the power reduction mode is determined to exit, and returning to the step of determining the allowable maximum heating power and the allowable peak power output duration of the battery pack according to the running mode of the equipment where the battery pack is located until the power adjustment mode is exited.
Optionally, the step of determining whether to exit the power reduction mode according to the second heating energy, the second cooling liquid refrigeration energy, and the second allowable maximum heating energy includes:
and if the difference value between the second heating energy and the refrigerating energy of the second cooling liquid is smaller than the product of a second preset coefficient and the second allowable maximum heating energy, exiting the power-down mode.
In a second aspect, an embodiment of the present application provides a battery power limiting device applied to a battery management system, where the battery management system is electrically connected to a battery pack, the device includes:
the determining module is used for determining the allowable maximum heating power and the allowable peak power output duration of the battery pack according to the running mode of equipment where the battery pack is located after entering a power regulation mode according to the cell temperature of the battery pack;
An entry module configured to determine, at each time, whether to enter a power-down mode to limit a maximum charge-discharge peak power of the battery pack using the allowable maximum heating power, the allowable peak power output duration, and a first duration and a second duration that are currently accumulated, wherein the first duration is accumulated by the battery management system after entering the power adjustment mode, the first duration is a duration that the battery management system is in a power regulation mode, the second duration is a duration that the battery management system accumulates actual power based on discharging of the battery pack at each moment after entering the power regulation mode, and the second duration is a duration that the battery pack outputs peak power.
In a third aspect, an embodiment of the present application provides a battery management system, which includes a storage unit storing a computer program that implements the battery power limiting method according to the foregoing first aspect when executed by the control unit.
In a fourth aspect, embodiments of the present application provide an energy storage device comprising a battery pack and a battery management system as described in the foregoing third aspect.
In a fifth aspect, embodiments of the present application provide a computer readable storage medium storing a computer program which, when executed by a processor, implements the battery power limiting method as described in the foregoing first aspect.
Additional features and advantages of embodiments of the application will be set forth in the description which follows, or in part will be obvious from the description, or may be learned by practice of the embodiments of the application.
The foregoing objects, features and advantages of the embodiments of the application will be more readily apparent from the following detailed description of the preferred embodiments taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic block diagram of an energy storage device according to an embodiment of the present application;
Fig. 2 is a schematic block diagram of a battery management system according to an embodiment of the present application;
FIG. 3 is a flowchart illustrating a method for limiting battery power according to an embodiment of the present application;
fig. 4 is a second flowchart of a battery power limiting method according to an embodiment of the present application;
Fig. 5 is a functional block diagram of a battery power limiting device according to an embodiment of the present application.
Icon: 100-an energy storage device; 110-a battery management system; a 111-memory cell; 112-a control unit; 120-battery pack; 200-battery power limiting means; 201-a determination module; 202-entering a module; 203-exit module.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to fall within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
Furthermore, the terms "first," "second," and the like, if any, are used merely for distinguishing between descriptions and not for indicating or implying a relative importance.
As shown in fig. 1, the battery management system 110 of the energy storage device 100 is electrically connected to the battery pack 120, and the battery management system 110 is a device for monitoring the state of the battery pack 120, mainly for intelligently managing and maintaining each battery unit, preventing the battery pack 120 from being overcharged and overdischarged, prolonging the service life of the battery pack 120, and monitoring the state of the battery. Typically, the battery management system 110 may be embodied as a circuit board or as a hardware box.
As shown in fig. 2, the battery management system 110 may include a storage unit 111 and a control unit 112, wherein the storage unit 111 stores a computer program, and the battery power limiting method described below may be implemented when the computer program stored in the storage unit 111 is executed by the control unit 112.
A battery power limiting method provided in the embodiments of the present application is described in detail below.
Referring to fig. 3, the battery power limiting method includes steps S101 to S102.
S101, after entering a power regulation mode according to the cell temperature of the battery pack, determining the allowable maximum heating power and the allowable peak power output duration of the battery pack according to the operation mode of equipment where the battery pack is located.
The device where the battery pack is located may be the energy storage device shown in fig. 1, and the battery management system determines whether to enter the power adjustment mode according to the highest temperature of the battery cells of the battery pack. For example, the battery management system may enter the power regulation mode when the maximum temperature of the battery cells of the battery pack is greater than 35 ℃, and may exit the power regulation mode when the maximum temperature of the battery cells of the battery pack is less than 32 ℃.
The operation modes of the energy storage device include a mode I, a mode II and a mode III, under different operation modes, the battery pack has different feedback control requirements, as shown in table 1, under the modes I and II, the feedback control requirement of the battery pack is 'feedback on', under the mode III, the feedback control requirement of the battery pack is 'feedback off', when the feedback of the battery pack is off, the charging peak power of the battery pack is reduced to 0, and the charging continuous power is reduced to 0.
Under different operation modes, the temperature rise control requirement and the allowable peak power use time of the battery pack are also different, as shown in table 1, the temperature rise control requirement of the battery pack under the mode i is a ℃/min, the allowable peak power use time is T 1 seconds, the temperature rise control requirement of the battery pack under the mode ii is b ℃/min, the allowable peak power use time is T 2 seconds, the temperature rise control requirement of the battery pack under the motion mode is c ℃/min, and the allowable peak power use time is T 3 seconds.
TABLE 1
In the embodiment of the application, according to the operation mode of the energy storage device, the temperature rise control requirement and the allowable peak power use time of the corresponding battery pack are obtained by looking up a table according to table 1, and then the allowable maximum heating power of the corresponding battery pack is obtained by looking up a table according to the temperature rise control requirement and table 2.
TABLE 2
S102, determining whether to enter a power-down mode or not at each moment by using the maximum allowable heating power, the maximum allowable peak power output duration, the current accumulated first duration and second duration so as to limit the maximum charge-discharge peak power of the battery pack.
The first duration is accumulated by the battery management system after entering the power regulation mode, and the first duration is the duration that the battery management system is in the power regulation mode.
The second time period is accumulated by the battery management system based on the discharging actual power of the battery pack at each moment after entering the power regulation mode, and the second time period is the time period of the battery pack outputting peak power.
It can be appreciated that in the embodiment of the present application, the battery management system accumulates the first time period after entering the power adjustment mode according to the cell temperature of the battery pack, and accumulates the second time period based on the actual discharge power of the battery pack at each time.
That is, each time after the battery management system enters the power adjustment mode is accumulated into the first time period, and the implementation process of accumulating the second time period based on the discharging actual power of the battery pack at each time period can be as follows:
For any moment, firstly judging whether the discharge actual power of the battery pack at the moment is larger than the discharge allowable continuous power of the battery pack by 1.1 times, namely judging the size relation between P Actual power of discharge and 1.1 times of P Discharge allowable continuous power ;
If yes, namely P Actual power of discharge >1.1*P Discharge allowable continuous power , accumulating the moment into a second duration when the energy storage device uses peak power;
if not, P Actual power of discharge <=1.1*P Discharge allowable continuous power , the energy storage device does not use peak power, then the time does not accumulate into the second time period.
In a possible implementation, step S102 includes sub-steps S102-1 to S102-2.
S102-1, acquiring the heating power and the cooling liquid refrigerating power of the current battery pack under the condition that the current accumulated second time length is longer than the allowable peak power output time length and the discharging actual power of the current battery pack is smaller than the preset discharging continuous power of the battery pack or under the condition that the current accumulated second time length is longer than twice the allowable peak power output time length.
The preset discharge continuous power of the battery pack is discharge allowable continuous power of the battery pack in a corresponding operation mode.
In the embodiment of the application, the first time period is recorded as t 1, the second time period is recorded as t 2, the discharge actual power of the battery pack is recorded as P 1, the discharge allowable continuous power of the battery pack is recorded as P 2, and the allowable peak power output time period of the battery pack is recorded as D.
When t 2 > D and P 1<P2, or when t 2 >2*D, the heating power P 3 of the battery pack is obtained by looking up a table according to the charge-discharge current multiplying power of the battery pack, and the cooling liquid cooling power P 4 of the battery pack is obtained by looking up a table according to the cooling liquid water pump flow rate and the temperature difference of the battery pack according to the table 4.
TABLE 3 Table 3
TABLE 4 Table 4
S102-2, determining whether to enter a power reduction mode according to the maximum allowable heating power, the current accumulated first duration, and the heating power and the cooling liquid refrigerating power of the current battery pack.
In a possible implementation, the implementation procedure of step S102-2 may include sub-steps S102-2-1 to S102-2-4.
S102-2-1, integrating the current accumulated first time length by utilizing the heating power of the current battery pack to obtain the first heating energy of the battery pack.
In the embodiment of the application, the first heating energy Q 1-1,Q1-1 of the battery pack is recorded as the integral of the heating power P 3 of the battery pack to the first time period t 1.
S102-2-2, the current accumulated first time length is integrated by utilizing the cooling liquid refrigerating power of the current battery pack, and the first cooling liquid refrigerating energy of the battery pack is obtained.
In the embodiment of the application, the first cooling liquid refrigeration energy Q 1-2,Q1-2 of the battery pack is recorded as the integral of the cooling liquid refrigeration power P 4 of the battery pack to the first time period t 1.
S102-2-3, integrating the current accumulated first time length by using the current maximum allowable heating power to obtain the first maximum allowable heating energy of the battery pack.
In an embodiment of the present application, the allowable maximum heating power of the battery pack is recorded as P 5, and the first allowable maximum heating energy of the battery pack is recorded as Q 1-3,Q1-3 as an integral of P 5 over the first time period t 1.
S102-2-4, determining whether to enter a power-down mode according to the first heating energy, the first cooling liquid refrigeration energy and the first allowable maximum heating energy.
In the embodiment of the application, if the difference between the first heating energy and the first cooling energy is greater than the product of the first preset coefficient and the first allowable maximum heating energy, the power-down mode is entered.
The first preset coefficient may be 1.1, that is, when (Q 1-1- Q1-2）>1.1* Q1-3, the battery management system enters the power-down mode, the maximum discharge peak power and the maximum charge peak power of the battery pack are respectively reduced to the set "power for allowing the battery pack to continue discharging for 30 seconds" and "power for allowing the battery pack to continue charging for 30 seconds" in the power MAP at a rate of 5KW/100 ms).
The following describes how the battery management system exits the reduced power mode.
Referring to fig. 4, the battery power limiting method further includes steps S103 to S107.
And S103, after entering a power-down mode, acquiring the heating power and the cooling liquid refrigerating power of the latest battery pack at each moment.
In the embodiment of the application, the latest heating power P '3 of the battery pack is obtained according to the charge-discharge current multiplying power of the battery pack and table 3, and the cooling power P' 4 of the battery pack is obtained according to the flow rate and temperature difference of the cooling liquid pump of the battery pack and table 4.
And S104, integrating the latest accumulated first time length by utilizing the latest heating power of the battery pack to obtain the second heating energy of the battery pack.
In an embodiment of the present application, the second heating energy Q 2-1,Q2-1 of the battery pack is recorded as an integral of the heating power P '3 of the battery pack to the latest accumulated first time period t' 1.
And S105, integrating the latest accumulated first time length by using the latest cooling liquid cooling power of the battery pack to obtain the second cooling liquid cooling energy of the battery pack.
In an embodiment of the present application, the second cooling fluid cooling energy of the battery pack is recorded as Q 2-2,Q2-2 being the integral of the cooling fluid cooling power P '4 of the latest battery pack to the latest accumulated first time period t' 1.
And S106, integrating the latest accumulated first time length by using the latest maximum allowable heating power to obtain the second maximum allowable heating energy of the battery pack.
In an embodiment of the present application, the allowable maximum heating power of the battery pack is recorded as P 5, and the second allowable maximum heating energy of the battery pack is recorded as Q 2-3,Q2-3 as an integral of P 5 over the latest accumulated first time period t' 1.
S107, determining whether to exit the power reduction mode according to the second heating energy, the second cooling liquid refrigerating energy and the second allowable maximum heating energy, resetting the first duration and the second duration to zero when determining to exit the power reduction mode, and returning to the step of determining the allowable maximum heating power and the allowable peak power output duration of the battery pack according to the operation mode of the equipment where the battery pack is located until exiting the power adjustment mode.
In the embodiment of the invention, if the difference between the second heating energy and the refrigerating energy of the second cooling liquid is smaller than the product of the second preset coefficient and the second allowable maximum heating energy, the power-down mode is exited.
Wherein the second preset coefficient may be 0.9, that is, when (Q 2-1- Q2-2）>0.9* Q2-3, the battery management system exits the reduced power mode, the maximum discharge peak power and the maximum charge peak power of the battery pack are respectively reduced to the set "power for allowing the battery pack to continue discharging for 10 seconds" and "power for allowing the battery pack to continue charging for 10 seconds" in the power MAP at a rate of 5KW/100 ms).
After the battery management system exits the power-down mode, the first time length and the second time length are required to be reset to zero, so that the first time length and the second time length are accumulated again from zero, and the steps of the steps S101-S102 are executed again until the power-down mode is entered again. And after the battery management module enters the power-down mode again, the steps of the steps S103-S107 are re-executed until the power-down mode is exited again. It can be understood that when the battery management system is in the power adjustment mode, the processes S101 to S107 are repeated, so that the battery management system accurately limits the charge and discharge peak power of the battery pack, and when the battery management system exits the power adjustment mode according to the cell temperature of the battery pack, the processes S101 to S107 are not repeated.
It should be noted that, the battery power limiting method provided by the embodiment of the application can be applied to a battery management system of an energy storage device, and can also be applied to a battery management system of an electric automobile to limit the maximum charge and discharge peak power of a battery pack of the energy storage device.
In order to perform the corresponding steps in the above method embodiments and in each of the possible implementations, a battery power limiting device 200 implementation is presented below.
Referring to fig. 5, the battery power limiting device 200 includes a determining module 201, an entering module 202, and an exiting module 203.
The determining module 201 is configured to determine an allowable maximum heating power and an allowable peak power output duration of the battery pack according to an operation mode of a device in which the battery pack is located after the power adjustment mode is entered according to a cell temperature of the battery pack.
An entry module 202 for determining whether to enter a power down mode at each time instant using the allowable maximum heating power, the allowable peak power output duration, and the current accumulated first and second durations to limit the maximum charge and discharge peak power of the battery pack; the first time is accumulated after the battery management system enters the power regulation mode, the first time is the time when the battery management system is in the power regulation mode, the second time is the time when the battery management system is accumulated based on the actual power of the discharge of the battery pack at each moment after the battery management system enters the power regulation mode, and the second time is the time when the battery pack outputs peak power.
The exit module 203 is configured to obtain, at each moment, heat generation power and cooling liquid refrigeration power of the latest battery pack after entering the power reduction mode; integrating the latest accumulated first time length by utilizing the latest heating power of the battery pack to obtain the second heating energy of the battery pack; integrating the latest accumulated first time by utilizing the cooling liquid refrigerating power of the latest battery pack to obtain the second cooling liquid refrigerating energy of the battery pack; integrating the latest accumulated first time length by utilizing the latest allowable maximum heating power to obtain second allowable maximum heating energy of the battery pack; determining whether to exit the power reduction mode according to the second heating energy, the second cooling liquid refrigerating energy and the second allowable maximum heating energy, resetting the first duration and the second duration to be zero when the power reduction mode is determined to exit, and returning to the step of determining the allowable maximum heating power and the allowable peak power output duration of the battery pack according to the running mode of the equipment where the battery pack is located until the power adjustment mode is exited.
It will be clear to those skilled in the art that, for convenience and brevity of description, the specific operation of the battery power limiting device 200 described above may refer to the corresponding procedure in the foregoing method embodiment, and will not be described in detail herein.
Embodiments of the present application also provide a computer-readable storage medium containing a computer program which, when executed, is operable to perform the relevant operations in the battery power limiting method provided by the method embodiments described above.
The present application is not limited to the above embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present application are intended to be included in the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.
Claims (10)
1. A battery power limiting method applied to a battery management system, the battery management system being electrically connected to a battery pack, the method comprising:
After entering a power regulation mode according to the cell temperature of the battery pack, determining the allowable maximum heating power and the allowable peak power output duration of the battery pack according to the operation mode of equipment where the battery pack is positioned;
Determining whether to enter a power reduction mode or not by using the maximum allowable heating power, the maximum allowable peak power output duration, and the first duration and the second duration which are accumulated currently at each moment so as to limit the maximum charge and discharge peak power of the battery pack; the first time period is accumulated after the battery management system enters the power regulation mode, the first time period is the time period when the battery management system is in the power regulation mode, the second time period is the time period when the battery management system is accumulated after the battery management system enters the power regulation mode based on the actual power of the discharge of the battery pack at each moment, and the second time period is the time period when the battery pack outputs peak power;
After entering the power-down mode, acquiring the latest heating power and cooling liquid refrigerating power of the battery pack at each moment;
Integrating the latest accumulated first time length by utilizing the latest heating power of the battery pack to obtain second heating energy of the battery pack;
Integrating the latest accumulated first time length by utilizing the latest cooling liquid refrigerating power of the battery pack to obtain second cooling liquid refrigerating energy of the battery pack;
Integrating the latest accumulated first time length by utilizing the latest allowable maximum heating power to obtain a second allowable maximum heating energy of the battery pack;
And determining whether to exit the power reduction mode according to the second heating energy, the second cooling liquid refrigeration energy and the second allowable maximum heating energy.
2. The method of claim 1, wherein the step of determining whether to enter the reduced power mode using the maximum allowable heating power, the allowable peak power output duration, and the current accumulated first and second durations comprises:
Acquiring the current heating power and cooling liquid refrigerating power of the battery pack under the condition that the current accumulated second time length is longer than the allowable peak power output time length and the current discharging actual power of the battery pack is smaller than the preset discharging continuous power of the battery pack or under the condition that the current accumulated second time length is longer than twice the allowable peak power output time length;
And determining whether to enter the power reduction mode according to the maximum allowable heating power, the current accumulated first duration, the current heating power of the battery pack and the current cooling power of the cooling liquid.
3. The method of claim 2, wherein determining whether to enter the reduced power mode based on the allowable maximum heating power, a current accumulated first time period, and a current heating power and coolant cooling power of the battery pack comprises:
Integrating the current accumulated first time length by utilizing the current heating power of the battery pack to obtain first heating energy of the battery pack;
integrating the current accumulated first time length by utilizing the current cooling liquid refrigerating power of the battery pack to obtain first cooling liquid refrigerating energy of the battery pack;
Integrating the current accumulated first time length by utilizing the current maximum allowable heating power to obtain the first maximum allowable heating energy of the battery pack;
And determining whether to enter the power reduction mode according to the first heating energy, the first cooling liquid refrigeration energy and the first allowable maximum heating energy.
4. The method of claim 3, wherein said step of determining whether to enter said reduced power mode based on said heat generation energy, said coolant refrigeration energy, and said allowable maximum heat generation energy comprises:
And if the difference value between the first heating energy and the refrigerating energy of the first cooling liquid is larger than the product of a first preset coefficient and the first allowable maximum heating energy, entering the power reduction mode.
5. The method of claim 1, wherein the method further comprises:
and resetting the first time length and the second time length to zero when the power-down mode is determined to be exited, and returning to the step of determining the allowable maximum heating power and the allowable peak power output time length of the battery pack according to the running mode of the equipment where the battery pack is located until the power-down mode is exited.
6. The method of claim 1, wherein determining whether to exit the reduced power mode based on the second heating energy, the second cooling fluid cooling energy, and the second allowable maximum heating energy comprises:
and if the difference value between the second heating energy and the refrigerating energy of the second cooling liquid is smaller than the product of a second preset coefficient and the second allowable maximum heating energy, exiting the power-down mode.
7. A battery power limiting device for use in a battery management system electrically connected to a battery pack, the device comprising:
the determining module is used for determining the allowable maximum heating power and the allowable peak power output duration of the battery pack according to the running mode of equipment where the battery pack is positioned after entering a power regulation mode according to the temperature of the battery core of the battery pack;
The entering module is used for determining whether to enter a power reduction mode or not at each moment by utilizing the maximum allowable heating power, the maximum allowable peak power output time length, the current accumulated first time length and second time length so as to limit the maximum charge and discharge peak power of the battery pack; the first time period is accumulated after the battery management system enters the power regulation mode, the first time period is the time period when the battery management system is in the power regulation mode, the second time period is the time period when the battery management system is accumulated after the battery management system enters the power regulation mode based on the actual power of the discharge of the battery pack at each moment, and the second time period is the time period when the battery pack outputs peak power;
The exit module is used for acquiring the latest heating power and cooling liquid refrigerating power of the battery pack at each moment after entering the power-down mode; integrating the latest accumulated first time length by utilizing the latest heating power of the battery pack to obtain second heating energy of the battery pack; integrating the latest accumulated first time length by utilizing the latest cooling liquid refrigerating power of the battery pack to obtain second cooling liquid refrigerating energy of the battery pack; integrating the latest accumulated first time length by utilizing the latest allowable maximum heating power to obtain a second allowable maximum heating energy of the battery pack; and determining whether to exit the power reduction mode according to the second heating energy, the second cooling liquid refrigeration energy and the second allowable maximum heating energy.
8. A battery management system, characterized in that it comprises a storage unit and a control unit, the storage unit storing a computer program which, when executed by the control unit, implements the battery power limiting method according to any one of claims 1 to 6.
9. An energy storage device comprising a battery pack and the battery management system of claim 8.
10. A computer readable storage medium, characterized in that it stores a computer program which, when executed by a processor, implements the battery power limiting method according to any one of claims 1 to 6.
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