CN117154294B - Battery pack heating and charging control method and device - Google Patents
Battery pack heating and charging control method and device Download PDFInfo
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- CN117154294B CN117154294B CN202311422629.0A CN202311422629A CN117154294B CN 117154294 B CN117154294 B CN 117154294B CN 202311422629 A CN202311422629 A CN 202311422629A CN 117154294 B CN117154294 B CN 117154294B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 287
- 238000007600 charging Methods 0.000 title claims abstract description 249
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 238000004321 preservation Methods 0.000 claims description 41
- 238000005070 sampling Methods 0.000 claims description 19
- 238000013507 mapping Methods 0.000 claims description 13
- 238000011217 control strategy Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 8
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 7
- 229910052744 lithium Inorganic materials 0.000 description 7
- 238000004891 communication Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000004590 computer program Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/443—Methods for charging or discharging in response to temperature
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/635—Control systems based on ambient temperature
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/637—Control systems characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching
-
- 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
- H02J7/00309—Overheat or overtemperature protection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
- H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
-
- 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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Automation & Control Theory (AREA)
- Power Engineering (AREA)
- Secondary Cells (AREA)
Abstract
The application provides a battery pack heating and charging control method and device, comprising the following steps: acquiring the minimum temperature of the battery pack and the external environment temperature fed back by the temperature detection assembly; traversing a plurality of temperature conditions, and determining target temperature conditions met by the external environment temperature and the lowest temperature of the battery pack; determining the lowest temperature deviation of the battery pack corresponding to the external environment temperature from a temperature compensation table according to the external environment temperature and the target temperature condition; determining the difference value between the lowest temperature of the battery pack and the lowest temperature deviation of the battery pack as the actual lowest temperature of the battery pack; and controlling the heating component to complete charging and heating of the battery pack according to the real minimum temperature of the battery pack and a charging and heating strategy corresponding to the target temperature condition, which are obtained in real time. According to the low-temperature charging control method and device, the low-temperature charging safety can be guaranteed through the low-temperature heating and charging control strategy, the heating and charging time can be shortened, and the user experience is improved.
Description
Technical Field
The application relates to the technical field of battery low-temperature charging, in particular to a battery pack heating and charging control method and device.
Background
In the field of new energy vehicles, in order to improve the low-temperature charging safety, reduce the heating power consumption and improve the endurance mileage under the low-temperature environment, a plurality of effective schemes and strategies exist for low-temperature heating and low-temperature charging of a battery pack, and for a household energy storage lithium battery system, the current relevant solving measures are few, and as the product is gradually changed from original indoor use only to indoor use which needs to be supported, the problem of low-temperature charging is also introduced, particularly, the lithium battery is charged outdoors, the safety of the lithium battery in low-temperature charging cannot be ensured, the heating and charging time of the lithium battery is increased, and the user experience is reduced.
Disclosure of Invention
Accordingly, an object of the present application is to provide a method and apparatus for controlling heating and charging of a battery pack, which can ensure the safety of low-temperature charging, shorten the time of heating and charging, and improve the user experience through a heating and charging control strategy.
The application mainly comprises the following aspects:
in a first aspect, an embodiment of the present application provides a battery pack heating and charging control method, which is applied to a battery pack heating system, where the battery pack heating system includes a battery pack, a heating component and a temperature detecting component, and the method includes: acquiring the minimum temperature of the battery pack and the external environment temperature fed back by the temperature detection assembly; traversing a plurality of temperature conditions, and determining target temperature conditions met by the external environment temperature and the lowest temperature of the battery pack; determining the lowest temperature deviation of the battery pack corresponding to the external environment temperature from a temperature compensation table according to the external environment temperature and the target temperature condition, wherein the temperature compensation table records the mapping relation between the external environment temperatures and the lowest temperature deviation of the battery packs; determining the difference value between the lowest temperature of the battery pack and the lowest temperature deviation of the battery pack as the actual lowest temperature of the battery pack; and controlling the heating component to complete charging and heating of the battery pack according to the real minimum temperature of the battery pack and a charging and heating strategy corresponding to the target temperature condition, which are obtained in real time.
In an alternative embodiment, the temperature sensing assembly includes a plurality of temperature sampling modules disposed at different locations within the battery pack heating system, wherein the battery pack minimum temperature is determined by: receiving the temperature of the battery pack fed back by each temperature sampling module; from the plurality of battery pack temperatures, a battery pack minimum temperature is determined.
In an alternative embodiment, the plurality of temperature conditions includes a first temperature condition, a second temperature condition, and a third temperature condition, the first temperature condition is that an external ambient temperature is less than or equal to 0 ℃ and a lowest temperature of the battery pack is less than or equal to 0 ℃, the second temperature condition is that an external ambient temperature is less than or equal to 0 ℃ and a lowest temperature of the battery pack is greater than 0 ℃, the third temperature condition is that an external ambient temperature is greater than 0 ℃, the charging heating strategy includes a first charging heating strategy, a second charging heating strategy, and a third charging heating strategy, wherein the heating and charging of the battery pack is accomplished by: if the target temperature condition is the first temperature condition, executing a first charging and heating strategy to finish charging and heating the battery pack; if the target temperature condition is the second temperature condition, executing a second charging and heating strategy to finish charging and heating the battery pack; and if the target temperature condition is the third temperature condition, executing a third charging heating strategy to finish charging and heating the battery pack.
In an alternative embodiment, the first charge heating strategy comprises: if the charging request signal is received, controlling the heating assembly to start a heating mode; in the heating mode, the battery pack is charged in the following charging manner: if the actual minimum temperature of the battery pack is greater than or equal to 0 ℃ and smaller than the first cut-off temperature, charging the battery pack according to a charging ammeter, wherein the charging ammeter indicates the mapping relation between the actual minimum temperature of the battery pack and the charging multiplying power, and if the actual minimum temperature of the battery pack is greater than or equal to the first cut-off temperature, charging the battery pack according to rated current; if the charging request signal is not received, controlling the heating assembly to start a heat preservation mode; if the charging request signal is received in the heat preservation mode, the heating assembly is controlled to exit the heat preservation mode, the heating mode is started, and the battery pack is charged according to the charging mode in the heating mode.
In an alternative embodiment, the second charging heating strategy comprises: if the charging request signal is received and the actual minimum temperature of the battery pack is smaller than the first cut-off temperature indicated by the heating mode, controlling the heating assembly to start the heating mode; in the heating mode: if the actual minimum temperature of the battery pack is greater than or equal to 0 ℃ and smaller than the first cut-off temperature, the battery pack is charged according to the charging ammeter, and if the actual minimum temperature of the battery pack is greater than or equal to the first cut-off temperature, the battery pack is charged according to rated current; if the charging request signal is not received, the heating component is controlled to maintain the standard mode.
In an alternative embodiment, the third charge heating strategy comprises: if the charging request signal is received and the actual minimum temperature of the battery pack is smaller than the first cut-off temperature, the heating assembly is controlled to start a heating mode; in the heating mode, the battery pack is charged in the following charging manner: if the actual minimum temperature of the battery pack is greater than or equal to 0 ℃ and smaller than the first cut-off temperature, the battery pack is charged according to the charging ammeter, and if the actual minimum temperature of the battery pack is greater than or equal to the first cut-off temperature, the battery pack is charged according to rated current; if the charging request signal is not received and the actual minimum temperature of the battery pack is less than 0 ℃, controlling the heating assembly to start a heat preservation mode; and if the charging request signal is not received and the actual minimum temperature of the battery pack is more than or equal to 0 ℃, controlling the heating assembly to maintain the standard mode.
In an alternative embodiment, the heating mode includes: continuously heating the battery pack; if the actual minimum temperature of the battery pack is greater than or equal to the first cut-off temperature, stopping heating; the heat preservation mode comprises the following steps: starting heating, and maintaining the actual minimum temperature of the battery pack in a heat preservation temperature interval; if the actual minimum temperature of the battery pack is greater than or equal to the upper limit of the heat preservation temperature interval, stopping heating; and if the actual minimum temperature of the battery pack is less than or equal to the lower limit of the heat preservation temperature interval, starting heating.
In an alternative embodiment, the standard mode includes: the heating mode and the heat-retaining mode are turned off, and the charging operation and the heating operation of the battery pack are not performed.
In an alternative embodiment, the lowest temperature deviation of the battery pack corresponding to the external ambient temperature is determined from the temperature compensation table by: if the target temperature condition is a first temperature condition or a second temperature condition, determining a plurality of first candidate external environment temperature intervals from a temperature compensation table, wherein the upper limit value of the interval corresponding to each first candidate external environment temperature interval is less than or equal to 0 ℃, and determining the target external environment temperature interval to which the external environment temperature belongs from the plurality of first candidate external environment temperature intervals; if the target temperature condition is a third temperature condition, determining a plurality of second candidate external environment temperature intervals from a temperature compensation table, wherein the lower limit value of the interval corresponding to each second candidate external environment temperature interval is greater than 0 ℃, and determining the target external environment temperature interval to which the external environment temperature belongs from the plurality of second candidate external environment temperature intervals; and determining the minimum temperature deviation of the target battery pack corresponding to the target external environment temperature interval as the minimum temperature deviation of the battery pack corresponding to the external environment temperature.
The embodiment of the application provides a battery pack heating and charging control method and device, comprising the following steps: acquiring the minimum temperature of the battery pack and the external environment temperature fed back by the temperature detection assembly; traversing a plurality of temperature conditions, and determining target temperature conditions met by the external environment temperature and the lowest temperature of the battery pack; determining the lowest temperature deviation of the battery pack corresponding to the external environment temperature from a temperature compensation table according to the external environment temperature and the target temperature condition; determining the difference value between the lowest temperature of the battery pack and the lowest temperature deviation of the battery pack as the actual lowest temperature of the battery pack; and controlling the heating component to complete charging and heating of the battery pack according to the real minimum temperature of the battery pack and a charging and heating strategy corresponding to the target temperature condition, which are obtained in real time. According to the low-temperature charging control method and device, the low-temperature charging safety can be guaranteed through the low-temperature heating and charging control strategy, the heating and charging time can be shortened, and the user experience is improved.
The application has the advantages that:
the battery pack can be charged efficiently at any temperature, particularly, a temperature compensation meter and a charging ammeter are introduced, the temperature compensation meter establishes a mapping relation between an external environment temperature interval and the lowest temperature deviation of the battery, the charging ammeter establishes a relation between the lowest temperature of the battery and the battery charging capacity, temperature compensation is carried out on sampling temperature based on the temperature compensation meter, the temperature acquisition precision is improved, more accurate charging multiplying power is conveniently provided for charging equipment according to the charging ammeter, the low-temperature lithium precipitation risk can be greatly reduced, the safety and reliability of low-temperature charging are improved, meanwhile, the temperature of the battery can be maintained in a proper range in a low-temperature environment temperature state in a low-temperature management mode, the heating time is reduced after a charging request is received, the temperature capable of supporting high-current charging is reached as soon as possible, and the charging time is shortened.
In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
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 limiting the scope, and that 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 structural diagram of a battery pack heating system according to an embodiment of the present application;
fig. 2 shows a flowchart of a battery pack heating and charging control method according to an embodiment of the present application;
FIG. 3 illustrates a flow chart of a first charge heating strategy provided by an embodiment of the present application;
FIG. 4 illustrates a flow chart of a second charge heating strategy provided by an embodiment of the present application;
FIG. 5 illustrates a flow chart of a third charge heating strategy provided by an embodiment of the present application;
fig. 6 shows a functional schematic of a battery pack heating and charging control device according to an embodiment of the present application;
Fig. 7 shows a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more clear, 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 should be understood that the accompanying drawings in the present application are only for the purpose of illustration and description, and are not intended to limit the protection scope of the present application. In addition, it should be understood that the schematic drawings are not drawn to scale. A flowchart, as used in this application, illustrates operations implemented according to some embodiments of the present application. It should be appreciated that the operations of the flow diagrams may be implemented out of order and that steps without logical context may be performed in reverse order or concurrently. Moreover, one or more other operations may be added to the flow diagrams and one or more operations may be removed from the flow diagrams as directed by those skilled in the art.
In addition, the described embodiments are only some, but not all, of the embodiments of the present application. The components of the embodiments of the present application, which are 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 present application, as provided in the accompanying drawings, 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 be within the scope of the present application.
In the field of new energy vehicles, a plurality of effective schemes and strategies for low-temperature heating and low-temperature charging of battery packs are provided for improving the low-temperature charging safety, reducing the heating power consumption and improving the endurance mileage under a low-temperature environment. For a household energy storage lithium battery system, the prior related solving measures are fewer, and as the product is gradually changed from original indoor use only to indoor use which is required to be supported, the problem of low-temperature charging is also introduced, and mainly the battery system cannot realize high-efficiency charging in a low-temperature state, so that the lithium separation risk of low-temperature charging is increased, and the charging safety is reduced.
Based on this, the embodiment of the application provides a battery pack heating and charging control method and device, through low-temperature heating and charging control strategy, the safety of low-temperature charging can be ensured, the time of heating and charging can be shortened, and the user experience is improved, specifically as follows:
the battery pack heating and charging control method is applied to a battery pack heating system, the battery pack heating system comprises a battery pack, a heating assembly and a temperature detection assembly, the battery pack comprises a plurality of battery modules, each battery module comprises a plurality of battery cores, the temperature assembly comprises a plurality of temperature sampling modules arranged at different positions in the battery pack heating system, the battery pack heating system mainly comprises two types, one type is a heating film heating system, and the other type is a water cooling plate heating system.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a battery pack heating system according to an embodiment of the present application. As shown in fig. 1, the battery pack heating system includes a case 1, a battery pack formed by a plurality of battery modules 2, and an electric appliance integration area 3, control circuits for charging, discharging, heating, etc. the plurality of battery modules 2 are provided inside the electric appliance integration area 3, the plurality of battery modules 2 are provided in the case 1, wherein, for a heating film heating system, at least one heating film (not shown in the figure) is covered on each battery module 2, for a water cooling plate heating system, a water cooling plate assembly (not shown in the figure) is further included, and the plurality of battery modules 2 are provided on the surface of the water cooling plate assembly.
Referring to fig. 2, fig. 2 is a flowchart illustrating a battery pack heating and charging control method according to an embodiment of the present application. As shown in fig. 2, the method includes:
s100, acquiring the minimum temperature of the battery pack and the external environment temperature fed back by the temperature detection component.
S200, traversing a plurality of temperature conditions, and determining target temperature conditions met by the external environment temperature and the lowest temperature of the battery pack.
S300, determining the lowest temperature deviation of the battery pack corresponding to the external environment temperature from a temperature compensation table according to the external environment temperature and the target temperature condition.
The temperature compensation table records the mapping relation between a plurality of external environment temperature intervals and the lowest temperature deviation of a plurality of battery packs.
And S400, determining the difference value between the lowest temperature of the battery pack and the lowest temperature deviation of the battery pack as the actual lowest temperature of the battery pack.
S500, controlling the heating component to complete charging and heating of the battery pack according to the real minimum temperature of the battery pack and a charging and heating strategy corresponding to the target temperature condition, which are obtained in real time.
In step S100, the temperature detection assembly includes a plurality of temperature sampling modules disposed at different positions in the battery pack heating system, the plurality of temperature sampling modules detect the temperature of the battery pack in real time, the temperature detection assembly further includes a temperature sensor disposed outside the chassis and used for detecting the external ambient temperature in real time, the temperature sampling modules can be NCT sampling resistors, and the plurality of temperature sampling modules are uniformly disposed at different positions of the battery pack so as to correspond to the condition of uneven distribution of the heat of the battery pack, so that the lowest temperature of the battery pack collected later is more accurate.
In a preferred embodiment, in step S100, the battery pack minimum temperature is determined by:
and receiving the temperature of the battery pack fed back by each temperature sampling module, and determining the lowest temperature of the battery pack from a plurality of battery pack temperatures.
Specifically, when the temperature of the battery pack is reduced to a certain degree, the charging and discharging of the battery pack can be influenced, so that the subsequent heating or charging and discharging control is safely performed.
In step S200, the plurality of temperature conditions includes a first temperature condition, a second temperature condition, and a third temperature condition, wherein:
the first temperature condition is that the external environment temperature AT is less than or equal to 0 ℃ and the lowest temperature of the battery pack≤0℃；
The second temperature condition is that the external environment temperature AT is less than or equal to 0 ℃ and the lowest temperature of the battery pack>0℃；
The third temperature condition is an external ambient temperature AT >0 ℃.
The charge heating strategy includes a first charge heating strategy, a second charge heating strategy, and a third charge heating strategy.
Specifically, the application combines the external environment temperature and the lowest temperature of the battery pack, sets three different temperature conditions and charging and heating strategies corresponding to the three different temperature conditions respectively, and realizes the temperature control of the battery pack, so that the battery charging safety can be further improved, and different temperature conditions correspond to different heating conditions required by the battery pack, so that heating resources can be saved as much as possible, and resource waste is further avoided.
In another preferred embodiment, the heating and charging of the battery pack is accomplished by:
and if the target temperature condition is the first temperature condition, executing a first charging and heating strategy to complete charging and heating of the battery pack, if the target temperature condition is the second temperature condition, executing a second charging and heating strategy to complete charging and heating of the battery pack, and if the target temperature condition is the third temperature condition, executing a third charging and heating strategy to complete charging and heating of the battery pack.
In the implementation, if the acquired external environment temperature is-5 ℃, and the lowest temperature of the battery pack is-2 ℃, the first temperature condition is satisfied at the moment, that is, the target temperature condition is the first temperature condition, and the first charging and heating strategy corresponding to the first temperature condition is executed to complete the charging process of the battery pack.
In step S200, because the temperature sampling module disposed inside the battery pack heating system is limited by structural design and assembly, the temperature sampling module cannot monitor the lowest temperature of the battery system generally, that is, the lowest temperature of the battery pack fed back by the temperature sampling module is higher than the actual lowest temperature of the battery pack, so that the present application compensates the lowest temperature of the battery pack fed back by the temperature sampling module by means of the temperature compensation table constructed in advance to obtain the actual lowest temperature of the battery pack.
In the application, before executing the method, thermocouple temperature sampling points can be arranged in the battery pack heating system, low-temperature heating tests are carried out under different low-temperature working conditions, and a temperature compensation table is generated according to test results.
Table 1:
table 1 is a temperature compensation table provided in the embodiment of the present application, in table 1, a mapping relationship between a plurality of external environment temperature intervals and the lowest temperature deviation δt of the battery pack is indicated, where AT represents the external environment temperature, for example, when AT < -15 ℃ is the external environment, the external environment temperature interval to which AT < -15 ℃ is the external environment temperature interval, and AT this time, the corresponding lowest temperature deviation δt=δt0 of the battery pack.
Because the heat dissipation capability of different battery pack heating systems is different, the temperature distribution of the battery packs is also different, and therefore, specific values of δt0 to δt7 may also be different due to the structural difference of the battery pack heating systems, and specific fingers corresponding to δt0 to δt7 may be: δt0=3, δt1=3, δt2=2.5, δt3=2, δt4=1.5, δt5=1, δt6=1, and δt7=0.5, and no specific limitation is made here.
In another preferred embodiment, step S300 includes:
if the target temperature condition is a first temperature condition or a second temperature condition, determining a plurality of first candidate external environment temperature intervals from a temperature compensation table, wherein the interval upper limit value corresponding to each first candidate external environment temperature interval is less than or equal to 0 ℃, and determining the target external environment temperature interval to which the external environment temperature belongs from the plurality of first candidate external environment temperature intervals.
If the target temperature condition is the third temperature condition, determining a plurality of second candidate external environment temperature intervals from the temperature compensation table, wherein the lower limit value of the interval corresponding to each second candidate external environment temperature interval is larger than 0 ℃, and determining the target external environment temperature interval to which the external environment temperature belongs from the plurality of second candidate external environment temperature intervals.
And determining the minimum temperature deviation of the target battery pack corresponding to the target external environment temperature interval as the minimum temperature deviation of the battery pack corresponding to the external environment temperature.
For example, if the external ambient temperature is-8 ℃, then the target temperature condition is the first temperature condition or the second temperature condition (AT < 0 ℃), then according to Table 1, the plurality of first candidate external ambient temperature intervals include AT < -15 ℃, -15 ℃. Ltoreq AT < -10 ℃, -10 ℃. Ltoreq AT < -5 ℃, -5 ℃. Ltoreq AT < 0 ℃ and 0 ℃. Ltoreq AT < 5 ℃, and the external ambient temperature is determined to be-10 ℃. Ltoreq AT < -5 ℃ for the interval to which-8 ℃ belongs, then the battery pack minimum temperature deviation corresponding to the external ambient temperature of-8 ℃ is δT2.
Before determining the lowest temperature deviation of the battery pack, the data in the temperature compensation table are screened by utilizing the external environment temperature range defined by the target temperature condition, and then the lowest temperature deviation of the battery pack is further determined by combining the screened data with the external environment temperature, so that the control efficiency of heating and charging of the battery pack can be further improved, namely the low-temperature charging safety of the battery pack is ensured, and the decision efficiency is further improved.
In an embodiment, referring to fig. 3, fig. 3 shows a flowchart of a first charging heating strategy according to an embodiment of the present application. As shown in fig. 3, the first charge heating strategy includes:
a1, judging whether a charging request signal is received.
A2, if the charging request signal is received, the heating assembly is controlled to start a heating mode.
Wherein the heating mode includes: and continuously heating the battery pack, and stopping heating if the actual minimum temperature of the battery pack is greater than or equal to the first cut-off temperature.
The heating mode can enable the battery to continuously heat up to a safe charging temperature environment, so that the battery pack can be charged more stably and safely, the working efficiency is guaranteed, and the service life of the battery is prolonged.
And A3, under the heating mode, if the actual minimum temperature of the battery pack is less than or equal to 0 ℃ and less than 15 ℃, charging the battery pack according to a charging ammeter.
The charging ammeter indicates the mapping relationship between the actual minimum temperature of the battery pack and the charging rate.
Table 2:
as shown in table 2, table 2 is a charging ammeter provided in the embodiment of the present application, in table 2, a mapping relationship between an actual minimum temperature T of a battery and a charging rate C of a battery pack is recorded, for example, when the actual minimum temperature T < -10 ℃ of the battery is less than or equal to-15 ℃, the charging rate is C0.
Because each cell has different charging capacities at different temperatures, specific values of C0 to C6 may also be different due to the difference between the cells, and specific values of C0 to C6 for a certain small-capacity lithium iron phosphate cell are as follows: c0 The values of =0.01, c1=0.02, c2=0.02, c3=0.1, c4=0.35, c5=0.5, and c6=0.8 may be adaptively adjusted according to the type of the battery cell used in the battery pack, and are not particularly limited herein.
And A4, if the actual minimum temperature of the battery pack is more than or equal to 15 ℃, charging the battery pack according to rated current.
Specifically, in the application, AT the external environment temperature AT is less than or equal to 0 ℃, and the lowest temperature of the battery pack(means that the lowest temperature collected by the sensor is less than or equal to 0 ℃ C.) AT this time, the heating mode is directly started upon receiving a charging request, because the external environment temperature and the battery pack are simultaneously in a low temperature condition, so that the direct charging is unsafe, the heating of the battery pack is triggered firstly to raise the temperature of the battery pack to a temperature capable of being safely charged, and then the charging is started, under the condition (AT is less than or equal to 0 ℃ C.)&&/>) Under the condition, the conversion frequency of a heating mode can be reduced, the heating trigger time is reduced, the heating efficiency of the battery pack is improved, and after the battery pack starts to charge, different charging multiplying powers are selected for charging at the actual minimum temperature of different battery packs, so that the charging safety can be ensured The circuit damage or the circuit failure caused by the fact that the temperature is too low but the excessive charging multiplying power is selected is avoided, and the service life and the working performance of the battery are improved.
A5, if the charging request signal is not received, controlling the heating assembly to start a heat preservation mode.
In a preferred embodiment, the keep-warm mode includes: and starting heating, namely maintaining the actual minimum temperature of the battery pack in a heat preservation temperature interval, stopping heating if the actual minimum temperature of the battery pack is greater than or equal to the upper limit of the heat preservation temperature interval, and starting heating if the actual minimum temperature of the battery pack is less than or equal to the lower limit of the heat preservation temperature interval.
Specifically, in the present application, the upper limit of the heat preservation temperature interval may be 4 ℃, the lower limit of the heat preservation temperature interval may be 2 ℃, that is, the heat preservation temperature interval is [2 ℃,4 ℃ and the first cutoff temperature may be 15 ℃.
The external environment temperature AT is less than or equal to 0 ℃ and the lowest temperature of the battery packAt a temperature of 0 ℃ or less, when no charge request is received, if no action is performed at this time, the battery pack is at the lowest temperature +>The battery pack can be frozen out in a low-temperature environment for a long time, so that the battery pack life is prolonged, and the temperature of AT is less than or equal to 0 ℃ and is less than or equal to 0 ℃ in order to avoid the occurrence of the conditions>And when the temperature is less than or equal to 0 ℃ and the charging request is not received, starting a heat preservation strategy to maintain the temperature of the battery pack within a certain range above zero, so that the low-temperature damage of the battery pack is avoided.
A6, if the charging request signal is received in the heat preservation mode, controlling the heating assembly to exit the heat preservation mode, starting the heating mode, and returning to execute the step A3.
If the heat preservation mode is started, a charging request signal is received, the heat preservation mode is pushed out, and the heating mode is started quickly, so that the charging action can be executed quickly, and the charging efficiency of the battery pack is improved.
In another embodiment, referring to fig. 4, fig. 4 shows a flowchart of a second charging heating strategy according to an embodiment of the present application. As shown in fig. 4, the second charge heating strategy includes:
b1, judging whether a charging request signal is received.
And B2, if the charging request signal is received and the actual lowest temperature of the battery pack is less than the first cut-off temperature, controlling the heating assembly to start a heating mode.
And B3, in the heating mode, if the actual lowest temperature of the battery pack is less than the first cut-off temperature, charging the battery pack according to a charging ammeter.
And B4, in the heating mode, if the actual minimum temperature of the battery pack is not less than the first cut-off temperature, charging the battery pack according to rated current.
In this case, although AT is.ltoreq.0deg.C >Therefore, although the battery pack is not reduced to the subzero temperature, the external environment is in a low-temperature state, and the battery pack is also continuously influenced by the battery pack, so that at the moment, if a charging request is received, whether the actual minimum temperature of the battery pack meets the heating requirement or not is detected firstly, namely, the heating mode is started or disconnected according to the actual situation, and the corresponding charging process is finished, so that the battery pack is started or closed from the actual situation to heat, the resource waste can be avoided, the heating realization is precisely controlled, and the harm caused by the overheating of the battery pack is avoided.
And B5, if the charging request signal is not received, controlling the heating component to maintain the standard mode.
AT AT is less than or equal to 0 DEG C>When the charging request signal is not received at 0 ℃, the heating function is not started at the moment, and the charging is not performed, so that the waste of heating resources is avoided.
In one example, the standard pattern includes: the heating mode and the heat-retaining mode are turned off, and the charging operation and the heating operation of the battery pack are not performed.
In an embodiment, referring to fig. 5, fig. 5 shows a flowchart of a third charging heating strategy according to an embodiment of the present application. As shown in fig. 5, the third charge heating strategy includes:
And C1, judging whether a charging request signal is received.
And C2, if the charging request signal is received and the actual minimum temperature of the battery pack is less than or equal to the first cut-off temperature, controlling the heating assembly to start a heating mode.
And C3, under the heating mode, if the actual minimum temperature of the battery pack is less than or equal to 0 ℃ and is less than the first cut-off temperature, charging the battery pack according to a charging ammeter.
And C4, in the heating mode, if the actual minimum temperature of the battery pack is not less than the first cut-off temperature, charging the battery pack according to rated current.
And C5, if the charging request signal is not received and the actual minimum temperature of the battery pack is less than 0 ℃, controlling the heating assembly to start a heat preservation mode.
And C6, if the charging request signal is not received and the actual minimum temperature of the battery pack is more than or equal to 0 ℃, controlling the heating assembly to maintain the standard mode.
The strategy focuses on monitoring the actual minimum temperature of the battery pack, executing a corresponding charging mode directly according to the temperature range of the actual minimum temperature of the battery pack when a charging request is received, and executing heat preservation or standard mode on the battery pack according to the temperature range of the actual minimum temperature of the battery pack when the charging request is not received, so that not only can the waste of heating resources be avoided, but also the battery pack can be always in a zero range.
Based on the same application conception, the embodiment of the present application further provides a battery pack heating and charging control device corresponding to the battery pack heating and charging control method provided in the foregoing embodiment, and since the principle of solving the problem by the device in the embodiment of the present application is similar to that of the battery pack heating and charging control method in the foregoing embodiment of the present application, the implementation of the device may refer to the implementation of the method, and the repetition is omitted.
Referring to fig. 6, fig. 6 is a functional schematic diagram of a battery pack heating and charging control device according to an embodiment of the present disclosure. As shown in fig. 6, the apparatus includes:
the acquiring module 600 is configured to acquire the minimum temperature of the battery pack and the external environment temperature fed back by the temperature detecting component.
The first determining module 610 is configured to traverse a plurality of temperature conditions and determine a target temperature condition satisfied by an external ambient temperature and a minimum temperature of the battery pack.
The second determining module 620 is configured to determine, according to the external environment temperature and the target temperature condition, a minimum temperature deviation of the battery pack corresponding to the external environment temperature from a temperature compensation table, where the temperature compensation table records a mapping relationship between a plurality of external environment temperature intervals and the minimum temperature deviations of the battery packs.
And a third determining module 630, configured to determine a difference between the lowest temperature of the battery pack and the deviation of the lowest temperature of the battery pack as the actual lowest temperature of the battery pack.
And the charging and heating module 640 is used for controlling the heating component to complete charging and heating of the battery pack according to the real minimum temperature of the battery pack obtained in real time and a charging and heating strategy corresponding to the target temperature condition.
Preferably, the temperature detection assembly includes a plurality of NTC sampling resistors disposed at different locations within the battery pack heating system, wherein the acquisition module 600 determines the battery pack minimum temperature by: receiving the temperature of the battery pack fed back by each NTC sampling resistor; from the plurality of battery pack temperatures, a battery pack minimum temperature is determined.
Preferably, the plurality of temperature conditions includes a first temperature condition, a second temperature condition, and a third temperature condition, the first temperature condition being an external ambient temperature less than or equal to 0 ℃ and a battery pack minimum temperature less than or equal to 0 ℃, the second temperature condition being an external ambient temperature less than or equal to 0 ℃ and a battery pack minimum temperature greater than 0 ℃, the third temperature condition being an external ambient temperature greater than 0 ℃, the charging heating strategy including a first charging heating strategy, a second charging heating strategy, and a third charging heating strategy, wherein the charging heating module 640 is further configured to: if the target temperature condition is the first temperature condition, executing a first charging and heating strategy to finish charging and heating the battery pack; if the target temperature condition is the second temperature condition, executing a second charging and heating strategy to finish charging and heating the battery pack; and if the target temperature condition is the third temperature condition, executing a third charging heating strategy to finish charging and heating the battery pack.
Preferably, the second determining module 620 is further configured to: if the target temperature condition is a first temperature condition or a second temperature condition, determining a plurality of first candidate external environment temperature intervals from a temperature compensation table, wherein the lower limit value of the interval corresponding to each first candidate external environment temperature interval is less than or equal to 0 ℃, and determining the target external environment temperature interval to which the external environment temperature belongs from the plurality of first candidate external environment temperature intervals; if the target temperature condition is a third temperature condition, determining a plurality of second candidate external environment temperature intervals from a temperature compensation table, wherein the lower limit value of the interval corresponding to each second candidate external environment temperature interval is greater than 0 ℃, and determining the target external environment temperature interval to which the external environment temperature belongs from the plurality of second candidate external environment temperature intervals; and determining the minimum temperature deviation of the target battery pack corresponding to the target external environment temperature interval as the minimum temperature deviation of the battery pack corresponding to the external environment temperature.
Preferably, in the charging heating module 640, the first charging heating strategy includes: if the charging request signal is received, controlling the heating assembly to start a heating mode; in the heating mode, the battery pack is charged in the following charging manner: if the actual minimum temperature of the battery pack is greater than or equal to 0 ℃ and smaller than the first cut-off temperature, charging the battery pack according to a charging ammeter, wherein the charging ammeter indicates the mapping relation between the actual minimum temperature of the battery pack and the charging multiplying power, and if the actual minimum temperature of the battery pack is greater than or equal to the first cut-off temperature, charging the battery pack according to rated current; if the charging request signal is not received, controlling the heating assembly to start a heat preservation mode; if the charging request signal is received in the heat preservation mode, the heating assembly is controlled to exit the heat preservation mode, the heating mode is started, and the battery pack is charged according to the charging mode in the heating mode.
Preferably, in the charging heating module 640, the second charging heating strategy includes: if the charging request signal is received and the actual minimum temperature of the battery pack is smaller than the first cut-off temperature indicated by the heating mode, controlling the heating assembly to start the heating mode; in the heating mode: if the actual minimum temperature of the battery pack is greater than or equal to 0 ℃ and smaller than the first cut-off temperature, the battery pack is charged according to the charging ammeter, and if the actual minimum temperature of the battery pack is greater than or equal to the first cut-off temperature, the battery pack is charged according to rated current; if the charging request signal is not received, the heating component is controlled to maintain the standard mode.
Preferably, in the charging heating module 640, the third charging heating strategy includes: if the charging request signal is received and the actual minimum temperature of the battery pack is less than 0 ℃, or the charging request signal is received and the actual minimum temperature of the battery pack is more than or equal to 0 ℃ and less than or equal to the first cut-off temperature, the heating module is controlled to start a heating mode; in the heating mode, the battery pack is charged in the following charging manner: if the actual minimum temperature of the battery pack is greater than or equal to 0 ℃ and smaller than the first cut-off temperature, the battery pack is charged according to the charging ammeter, and if the actual minimum temperature of the battery pack is greater than or equal to the first cut-off temperature, the battery pack is charged according to rated current; if the charging request signal is not received and the actual minimum temperature of the battery pack is less than 0 ℃, controlling the heating assembly to start a heat preservation mode; and if the charging request signal is not received and the actual minimum temperature of the battery pack is more than or equal to 0 ℃, controlling the heating assembly to maintain the standard mode.
Preferably, in the charging heating module 640, the heating mode includes: continuously heating the battery pack; if the actual minimum temperature of the battery pack is greater than or equal to the first cut-off temperature, stopping heating; the heat preservation mode comprises the following steps: starting heating, and maintaining the actual minimum temperature of the battery pack in a heat preservation temperature interval; if the actual minimum temperature of the battery pack is greater than or equal to the upper limit of the heat preservation temperature interval, stopping heating; and if the actual minimum temperature of the battery pack is less than or equal to the lower limit of the heat preservation temperature interval, starting heating.
Preferably, in the charge heating module 640, the standard modes include: the heating mode and the heat-retaining mode are turned off, and the charging operation and the heating operation of the battery pack are not performed.
Based on the same application concept, please refer to fig. 7, fig. 7 shows a schematic structural diagram of an electronic device according to an embodiment of the present application. The electronic device 700 includes: processor 710, memory 720 and bus 730, memory 720 storing machine-readable instructions executable by processor 710, which when executed by processor 710 performs the steps of the battery pack thermal charge control method as provided in any of the embodiments described above, when electronic device 700 is in operation, processor 710 and memory 720 are in communication via bus 730.
Based on the same application concept, the embodiment of the application further provides a computer readable storage medium, and a computer program is stored on the computer readable storage medium, and when the computer program is executed by a processor, the steps of the battery pack heating and charging control method provided by the embodiment are executed.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described system and apparatus may refer to corresponding procedures in the foregoing method embodiments, which are not described herein again. In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be other manners of division in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown 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 units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer readable storage medium executable by a processor. Based on such understanding, the technical solutions of the present application may be embodied in essence or a part contributing to the prior art or a part of the technical solutions, or in the form of a software product, which is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes or substitutions are covered in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (9)
1. A battery pack heating and charging control method is characterized by being applied to a battery pack heating system, wherein the battery pack heating system comprises a battery pack, a heating component and a temperature detection component,
wherein the method comprises the following steps:
acquiring the lowest temperature of the battery pack and the external environment temperature fed back by the temperature detection assembly;
traversing a plurality of temperature conditions, and determining target temperature conditions met by the external environment temperature and the lowest temperature of the battery pack;
determining the lowest temperature deviation of the battery pack corresponding to the external environment temperature from a temperature compensation table according to the external environment temperature and the target temperature condition, wherein the temperature compensation table records the mapping relation between a plurality of external environment temperature intervals and the lowest temperature deviation of the battery pack;
determining the difference value between the lowest temperature of the battery pack and the lowest temperature deviation of the battery pack as the actual lowest temperature of the battery pack;
According to the real minimum temperature of the battery pack obtained in real time and a charging and heating strategy corresponding to the target temperature condition, controlling the heating assembly to complete charging and heating of the battery pack;
the plurality of temperature conditions includes a first temperature condition, the first temperature condition being an external ambient temperature of less than or equal to 0 ℃ and a battery pack minimum temperature of less than or equal to 0 ℃;
wherein the heating and charging of the battery pack is accomplished by:
if the target temperature condition is a first temperature condition, executing a first charging and heating strategy to complete charging and heating of the battery pack;
the first charge heating strategy includes:
if a charging request signal is received, controlling the heating component to start a heating mode;
in the heating mode, the battery pack is charged in the following charging manner: if the actual minimum temperature of the battery pack is greater than or equal to 0 ℃ and less than the first cut-off temperature, the battery pack is charged according to a charging ammeter which indicates the mapping relationship between the actual minimum temperature of the battery pack and the charging multiplying power,
if the actual minimum temperature of the battery pack is greater than or equal to the first cut-off temperature, charging the battery pack according to rated current;
If the charging request signal is not received, controlling the heating component to start a heat preservation mode;
and if the charging request signal is received in the heat preservation mode, controlling the heating assembly to exit the heat preservation mode, starting the heating mode, and charging the battery pack according to the charging mode in the heating mode.
2. The method of claim 1, wherein the temperature sensing assembly comprises a plurality of temperature sampling modules disposed at different locations within the battery pack heating system,
wherein the minimum temperature of the battery pack is determined by:
receiving the temperature of the battery pack fed back by each temperature sampling module;
from a plurality of battery pack temperatures, a minimum battery pack temperature is determined.
3. The method of claim 1, wherein the plurality of temperature conditions further comprises a second temperature condition and a third temperature condition, the second temperature condition being an external ambient temperature less than or equal to 0 ℃ and a battery pack minimum temperature greater than 0 ℃, the third temperature condition being an external ambient temperature greater than 0 ℃, the charging heating strategy comprising a first charging heating strategy, a second charging heating strategy, and a third charging heating strategy,
wherein the heating and charging of the battery pack is accomplished by:
If the target temperature condition is a second temperature condition, executing the second charging and heating strategy to finish charging and heating the battery pack;
and if the target temperature condition is a third temperature condition, executing the third charging and heating strategy to finish charging and heating the battery pack.
4. A method according to claim 3, wherein the second charging heating strategy comprises:
if a charging request signal is received and the actual minimum temperature of the battery pack is smaller than the first cut-off temperature indicated by the heating mode, controlling the heating assembly to start the heating mode;
in the heating mode: if the actual minimum temperature of the battery pack is greater than or equal to 0 ℃ and less than the first cut-off temperature, the battery pack is charged according to a charging ammeter,
if the actual minimum temperature of the battery pack is greater than or equal to the first cut-off temperature, charging the battery pack according to rated current;
and if the charging request signal is not received, controlling the heating component to maintain the standard mode.
5. A method according to claim 3, wherein the third charging heating strategy comprises:
if a charging request signal is received and the actual minimum temperature of the battery pack is smaller than the first cut-off temperature, controlling the heating assembly to start a heating mode;
In the heating mode, the battery pack is charged in the following charging manner: if the actual minimum temperature of the battery pack is more than or equal to 0 ℃ and less than the first cut-off temperature, the battery pack is charged according to a charging ammeter,
if the actual minimum temperature of the battery pack is greater than or equal to the first cut-off temperature, charging the battery pack according to rated current;
if the charging request signal is not received and the actual minimum temperature of the battery pack is less than 0 ℃, controlling the heating assembly to start a heat preservation mode;
and if the charging request signal is not received and the actual minimum temperature of the battery pack is more than or equal to 0 ℃, controlling the heating assembly to maintain the standard mode.
6. The method of claim 1, wherein the heating mode comprises:
continuously and uninterruptedly heating the battery pack;
if the actual minimum temperature of the battery pack is greater than or equal to the first cut-off temperature, stopping heating;
the heat preservation mode comprises the following steps:
starting heating, and maintaining the actual minimum temperature of the battery pack in a heat preservation temperature interval;
if the actual minimum temperature of the battery pack is greater than or equal to the upper limit of the heat preservation temperature interval, stopping heating;
and if the actual minimum temperature of the battery pack is less than or equal to the lower limit of the heat preservation temperature interval, starting heating.
7. The method of claim 5, wherein the standard mode comprises:
the heating mode and the heat-retaining mode are turned off, and the charging operation and the heating operation of the battery pack are not performed.
8. A method according to claim 3, characterized in that the lowest temperature deviation of the battery pack corresponding to the external ambient temperature is determined from a temperature compensation table by:
if the target temperature condition is a first temperature condition or a second temperature condition, determining a plurality of first candidate external environment temperature intervals from the temperature compensation table, wherein the lower limit value of the interval corresponding to each first candidate external environment temperature interval is less than or equal to 0 ℃, and determining the target external environment temperature interval to which the external environment temperature belongs from the plurality of first candidate external environment temperature intervals;
if the target temperature condition is a third temperature condition, determining a plurality of second candidate external environment temperature intervals from the temperature compensation table, wherein the lower limit value of the interval corresponding to each second candidate external environment temperature interval is greater than 0 ℃, and determining the target external environment temperature interval to which the external environment temperature belongs from the plurality of second candidate external environment temperature intervals;
And determining the minimum temperature deviation of the target battery pack corresponding to the target external environment temperature interval as the minimum temperature deviation of the battery pack corresponding to the external environment temperature.
9. A battery pack heating charge control device, characterized by being applied to a battery pack heating system including a battery pack, a heating assembly, and a temperature detection assembly, the device comprising:
the acquisition module is used for acquiring the lowest temperature of the battery pack and the external environment temperature fed back by the temperature detection assembly;
the first determining module is used for traversing a plurality of temperature conditions and determining target temperature conditions met by the external environment temperature and the lowest temperature of the battery pack;
the second determining module is used for determining the lowest temperature deviation of the battery pack corresponding to the external environment temperature from a temperature compensation table according to the external environment temperature and the target temperature condition, wherein the temperature compensation table records the mapping relation between a plurality of external environment temperature intervals and the lowest temperature deviation of the battery pack;
the third determining module is used for determining the difference value between the lowest temperature of the battery pack and the lowest temperature deviation of the battery pack as the actual lowest temperature of the battery pack;
The charging heating module is used for controlling the heating assembly to finish charging and heating the battery pack according to the real minimum temperature of the battery pack and a charging heating strategy corresponding to the target temperature condition, which are acquired in real time;
the plurality of temperature conditions includes a first temperature condition, the first temperature condition being an external ambient temperature of less than or equal to 0 ℃ and a battery pack minimum temperature of less than or equal to 0 ℃;
wherein, the heating module that charges is still used for:
if the target temperature condition is a first temperature condition, executing a first charging and heating strategy to complete charging and heating of the battery pack;
the first charge heating strategy includes:
if a charging request signal is received, controlling the heating component to start a heating mode;
in the heating mode, the battery pack is charged in the following charging manner: if the actual minimum temperature of the battery pack is greater than or equal to 0 ℃ and less than the first cut-off temperature, the battery pack is charged according to a charging ammeter which indicates the mapping relationship between the actual minimum temperature of the battery pack and the charging multiplying power,
if the actual minimum temperature of the battery pack is greater than or equal to the first cut-off temperature, charging the battery pack according to rated current;
If the charging request signal is not received, controlling the heating component to start a heat preservation mode;
and if the charging request signal is received in the heat preservation mode, controlling the heating assembly to exit the heat preservation mode, starting the heating mode, and charging the battery pack according to the charging mode in the heating mode.
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