Battery heating method, apparatus, device and storage medium

Abstract

The present invention provides a battery heating method, apparatus, device, and storage medium, in which the battery heating method includes: acquiring a first temperature and a first charge state of a battery; determining a first current frequency based on a first predetermined data table including a correspondence relationship between the first temperature, the first charge state, and a first current frequency under the conditions of the first temperature, the first charge state, and the first current amplitude; and heating the battery based on the first current amplitude and the first current frequency. The present application determines a current frequency and amplitude for internal heating based on the temperature of the battery, and can improve the heating rate of the battery in various temperature environments.

Description

[Technical field]

[0001] The present application relates to the technical field of batteries, and in particular to a battery heating method, apparatus, device and storage medium. [Background technology]

[0002] As is well known, temperature has a significant effect on the operational performance of a battery. When a certain type of battery, such as a lithium battery, is in a low temperature operating environment, it is common to heat it to a higher temperature to improve its operational performance.

[0003] In the related art, a battery is generally heated with constant heating parameters, and there is a problem that the heating rate is low. Summary of the Invention

[0004] The present application provides a battery heating method, apparatus, device and storage medium that solves the problem of low battery heating rate in the related art.

[0005] In a first aspect, the present application provides a method for producing a method for treating a cancer cell comprising: Obtaining a first temperature and a first state of charge of the battery; determining a first current frequency based on a first predetermined data table including a correspondence relationship between the first temperature, the first charge state, and the first current frequency under the conditions of the first temperature, the first charge state, and the first current amplitude; heating the battery based on a first current amplitude and a first current frequency; The present invention provides a battery heating method, comprising:

[0006] The battery heating method according to the embodiment of the present application obtains a first temperature and a first charge state of a battery, determines a first current frequency based on the first temperature, the first charge state, and a predetermined first data table, and heats the battery based on the first current amplitude and the first current frequency, where the first data table includes a correspondence relationship between the first temperature, the first charge state, and the first current frequency under the condition of the first current amplitude. The embodiment of the present application can determine the current frequency and amplitude for internal heating based on the temperature of the battery, and can improve the heating rate of the battery in various temperature environments. Since the first current amplitude is predetermined, when determining the heating parameters of the battery, it is possible to save the consumption of calculation resources due to the determination of the first current amplitude and improve the efficiency of determining the heating parameters of the battery. And, it is advantageous to reduce the consumption of labor due to the creation of the first data table, since there is no need to create the first data table for each of various current amplitudes. By determining the first current amplitude, the lack of limitation on the current amplitude for heating the battery can avoid the situation of lithium deposition in the battery core due to the current amplitude being too high for actually heating the battery.

[0007] In some embodiments, the number of first data tables is N, and the N first data tables are associated with N battery health states, where N is an integer greater than 1; Identifying a first current frequency based on the first temperature, the first charge state, and a first predetermined data table includes: Obtaining a first health status of a battery; Identifying a second data table from the N first data tables that is associated with a first health measure; determining a first current frequency based on the first temperature, the first charge state and a second data table; Includes

[0008] In this embodiment, the SOH is considered as a safety redundancy, which can further improve the reliability of the battery heating process.

[0009] In certain embodiments, heating the battery based on a first current amplitude and a first current frequency includes: heating the battery based on a first current amplitude and a first current frequency from a first time; After heating the battery based on the first current amplitude and the first current frequency, the method further comprises: When a second time is reached whose period between the first time and the second time is equal to the first predetermined period, returning to the step of performing obtaining the first temperature and the first state of charge of the battery.

[0010] In this embodiment, the battery is heated in different heating cycles, and in each heating cycle, the current frequency for heating the battery is adjusted based on the first temperature of the battery, which is advantageous to effectively improve the heating safety and heating efficiency of the battery.

[0011] In certain embodiments, after identifying the first current frequency based on the first temperature, the first charge state, and the first predetermined data table, the method further comprises: When the second current amplitude is acquired, a third current frequency is identified based on the second current amplitude, the third current frequency being a safe current frequency for heating the battery under the condition of the second current amplitude; heating the battery based on a greater value between the first current frequency and the third current frequency and the second current amplitude; Includes

[0012] This embodiment can effectively ensure the safety of the battery heating process under various current amplitude conditions.

[0013] In a second aspect, the present application provides a method for producing a method for treating a cancer cell comprising: obtaining a second temperature and a second state of charge of the battery; determining a third current amplitude based on a third predetermined data table including a correspondence relationship between the second temperature, the second charge state, and the third current amplitude under the second temperature, the second charge state, and the fourth current frequency; heating the battery based on a fourth current frequency and a third current amplitude; The present invention provides a battery heating method, comprising:

[0014] The battery heating method according to the embodiment of the present application obtains a second temperature and a second charge state of the battery, determines a third current amplitude based on the second temperature, the second charge state, and a predetermined third data table, and heats the battery based on a fourth current frequency and a third current amplitude, where the third data table includes a correspondence relationship between the second temperature, the second charge state, and the third current amplitude under the condition of the fourth current frequency. The embodiment of the present application determines the current frequency and amplitude for internal heating based on the temperature of the battery, thereby improving the heating rate of the battery in various temperature environments. Since the fourth current frequency is predetermined, when determining the heating parameters of the battery, it is possible to save the consumption of calculation resources due to the determination of the fourth current frequency and to improve the efficiency of determining the heating parameters of the battery. In addition, it is not necessary to create the third data table for each of various current frequencies, which is advantageous in reducing the effort required for creating the third data table. By determining the first current frequency, the absence of limitations on the frequency for heating the battery makes it possible to avoid the occurrence of a situation in which the current frequency for actually heating the battery is too high.

[0015] In certain embodiments, after identifying the third current amplitude, the method further comprises: Obtaining an output voltage of a battery; if the output voltage is less than the voltage threshold, heating the battery based on a predetermined fifth current frequency and a third current amplitude; Including, Heating the battery based on a fourth current frequency and a third current amplitude if the output voltage is greater than or equal to the voltage threshold, heating the battery based on a fourth current frequency and a third current amplitude; The fifth current frequency is greater than the fourth current frequency.

[0016] This embodiment can achieve both safety in the battery heating process and heating efficiency.

[0017] In certain embodiments, the third current amplitude is a forward current amplitude; Heating the battery based on a fourth current frequency and a third current amplitude Heating the battery based on a fourth current frequency, a third current amplitude, and the predetermined first reverse current amplitude.

[0018] This embodiment is advantageous in reducing the amount of calculation when identifying heating parameters, and at the same time, is advantageous in ensuring the safety of the battery heating process.

[0019] In certain embodiments, after identifying the third current amplitude, the method further comprises: Obtaining an output voltage of a battery; if the output voltage is less than the voltage threshold, heating the battery based on a fourth current frequency, a third current amplitude, and a second predetermined reverse current amplitude; Including, Specifically, heating the battery based on the fourth current frequency, the third current amplitude, and the predetermined first reverse current amplitude includes: if the output voltage is equal to or greater than the voltage threshold, heating the battery based on a fourth current frequency, a third current amplitude, and a first predetermined reverse current amplitude; The first reverse current amplitude is greater than the second reverse current amplitude.

[0020] This embodiment can avoid safety issues caused by over-discharging the battery, and is also advantageous in extending the service life of the battery.

[0021] In some embodiments, the number of third data tables is M, and the M third data tables are associated with M battery health states, where M is an integer greater than 1; determining a third current amplitude based on the second temperature, the second charge state, and a third predetermined data table; Obtaining a second state of health of the battery; and identifying a fourth data table from the M third data tables related to the second health measure; determining a third current amplitude based on the second temperature, the second charge state and a fourth data table; Including,

[0022] In this embodiment, the SOH is considered as a safety redundancy, which can further improve the reliability of the battery heating process.

[0023] In certain embodiments, heating the battery based on a fourth current frequency and a third current amplitude includes: heating the battery based on a fourth current frequency and a third current amplitude from a third time; After heating the battery based on the fourth current frequency and the third current amplitude, the method further comprises: When a fourth time is reached where the period between the third time and the fourth time is equal to the second predetermined period, returning to the step of obtaining a second temperature and a second state of charge of the battery.

[0024] In this embodiment, the battery is heated in different heating cycles, and in each heating cycle, the current amplitude for heating the battery is adjusted based on the second temperature of the battery, which is advantageous to effectively improve the heating safety and heating efficiency of the battery.

[0025] In a third aspect, the present application provides a method for producing a method for treating a cancer cell comprising: a first acquisition module for acquiring a first temperature and a first charge state of the battery; a first determination module for determining a first current frequency based on a first predetermined data table including a correspondence relationship between the first temperature, the first charge state, and the first current frequency under the conditions of the first temperature, the first charge state, and the first current amplitude; a first heating control module for heating the battery based on a first current amplitude and a first current frequency; A battery heating device comprising:

[0026] In a fourth aspect, the present application provides a method for producing a method for treating a cancer cell comprising: a second acquisition module for acquiring a second temperature and a second charge state of the battery; a second determination module for determining a third current amplitude based on a third predetermined data table including a correspondence relationship between the second temperature, the second charge state, and the third current amplitude under the second temperature, the second charge state, and the fourth current frequency; a second heating control module for heating the battery based on a fourth current frequency and a third current amplitude; A battery heating device comprising:

[0027] In a fifth aspect, the present application provides an electronic device comprising a processor and a memory having computer program instructions stored thereon.

[0028] When the processor executes the computer program instructions, the battery heating method according to the first aspect is realized, or the battery heating method according to the second aspect is realized.

[0029] In a sixth aspect, the present application provides a computer storage medium having computer program instructions stored therein, the computer storage medium realizing the battery heating method shown in the first aspect or the battery heating method shown in the second aspect when the computer program instructions are executed by a processor. [Brief description of the drawings]

[0030] In order to more clearly explain the technical solutions of the embodiments of the present application, the following briefly introduces the drawings necessary for the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can further obtain other drawings based on the drawings without creative labor. [Figure 1] FIG. 1 is a schematic diagram of an equivalent circuit of a lithium ion battery. [Diagram 2] FIG. 2 is a schematic diagram showing the relationship between the maximum amplitude and frequency of AC current of a lithium ion battery at different temperatures under conditions that suppress lithium deposition. [Diagram 3]FIG. 2 is a schematic diagram of maximum heat generation power when preheating with AC currents of different frequencies at different temperatures under lithium deposition conditions. [Figure 4] FIG. 13 is a schematic diagram showing selection of an optimal frequency when an AC current amplitude is set. [Diagram 5] 1 is a flow chart of a battery heating method disclosed in one embodiment of the present application. [Figure 6] FIG. 1 is a diagram showing an example of a battery heating process. [Figure 7] 4 is a flowchart of a battery heating method disclosed in another embodiment of the present application. [Figure 8] FIG. 11 is a diagram showing another example of a battery heating process. [Figure 9] FIG. 2 is a schematic diagram of a heating system for heating a battery. [Figure 10] FIG. 2 is another schematic diagram of a heating system for heating a battery. [Figure 11] 1 is a schematic diagram of a configuration of a battery heating device disclosed in one embodiment of the present application. [Figure 12] FIG. 2 is a schematic diagram illustrating the configuration of a battery heating device disclosed in another embodiment of the present application. [Figure 13] FIG. 1 is a schematic diagram illustrating a configuration of an electronic device disclosed in one embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] The embodiments of the present application will be described in more detail below with reference to the drawings and examples. The detailed description of the following examples and the drawings are used to exemplarily explain the principles of the present application, but are not intended to limit the scope of the present application. That is, the present application is not limited to the described examples.

[0032] It should be noted that, in this specification, relational terms such as first and second are used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that any such relation or order exists between those entities or operations. Also, the terms "comprise", "have", or any other variation are intended to cover a non-exclusive inclusion, whereby a process, method, article, or installation that includes a set of elements not only includes those elements, but also includes other elements not expressly listed or elements inherent in such process, method, article, or installation. Absent more limitations, an element qualified by the phrase "comprises" does not exclude the presence of other identical elements in the process, method, article, or installation that includes the element.

[0033] Generally, for batteries such as lithium batteries, the operating environment has a significant impact on their operating performance. Take the lithium power battery used in an electric vehicle as an example, when the electric vehicle starts up in a low temperature environment, the operating performance of the lithium power battery decreases at low temperatures, which may cause the electric vehicle to be unable to start up or run normally.

[0034] Of course, in practical applications, heating may be required not only for lithium batteries, but also for other types of batteries, such as sodium ion batteries or magnesium ion batteries.

[0035] Currently, there are two main ways to heat batteries: external heating and internal heating. External heating is mainly achieved by thermal conduction or thermal convection, and batteries are heated externally using PTC materials or heating films. However, this method is prone to uneven heating and has low heating efficiency. Internal heating generates heat directly inside the battery, so its energy efficiency is higher and heat is received more uniformly.

[0036] In the course of research, the inventors compared various heating methods and discovered that when internal heating is performed using AC power (hereinafter referred to as AC internal heating), the battery temperature uniformity is high and battery energy loss is small.

[0037] When the power source to be heated is the battery itself, internal heating of the battery using DC power (hereinafter referred to as DC internal heating) can avoid the use of circuit elements that realize functions such as inverters, and therefore is low cost, but causes a large energy loss in the battery. In addition, excessive DC current has a certain effect on the battery life.

[0038] In general, AC internal heating is easier to implement than external heating methods and DC internal heating methods, and provides faster heating speed and better heating uniformity to the battery.

[0039] For the sake of simplicity, the following description mainly takes the battery as an example of a lithium battery.

[0040] As shown in FIG. 1, FIG. 1 is a schematic diagram of an equivalent circuit of a lithium ion battery. As can be seen from the equivalent circuit, the impedance of a lithium ion battery is mainly composed of three parts: Z1, Z2, and Z3.

[0041] Here, Z1 is the ohmic resistance component R0 of the internal current collector, active material, electrolyte, etc. of the lithium ion battery. Z2 is the impedance component corresponding to the particle surface solid electrolyte interphase (SEI) membrane, specifically the capacitance impedance Q SEI and ohmic resistance R SEI Z3 is the electric double layer capacitor Q dl , charge transfer resistance R ct and the impedance W corresponding to the diffusion process of lithium ions.

[0042] Generally, when a current flows through a battery, it can cause the battery potential to deviate from the equilibrium potential, a phenomenon known as battery polarization.

[0043] When a lithium battery is polarized, lithium deposition may occur on the negative electrode. Specifically, in a lithium-ion battery, lithium ions are released from the positive electrode and embedded in the negative electrode during charging. However, if some abnormal situation occurs and the lithium ions released from the positive electrode cannot be inserted into the negative electrode, the lithium ions will only deposit on the surface of the negative electrode, forming a layer of gray material.

[0044] Lithium deposition not only deteriorates battery performance and significantly shortens the cycle life, but also limits the fast charging capacity of the battery and may cause disasters such as fire and explosion.

[0045] In order to avoid lithium deposition on the negative electrode, it is necessary that the potential difference between the solid phase and the liquid phase on the surface of the negative electrode particles is greater than the equilibrium potential of the lithium deposition reaction, i.e. Φs-Φ l >U e,2 where Φs is the solid-state potential of the negative electrode particle surface, and Φ l is the liquid potential of the negative electrode particle surface, and U e,2 is the equilibrium potential for the lithium deposition reaction, and is generally considered to be 0V.

[0046] When the lithium deposition reaction occurs, lithium ions need to obtain electrons and be reduced to lithium metal. In general, the lithium deposition reaction is believed to initially occur inside the SEI film on the graphite particle surface, and the overpotential η of the lithium insertion reaction at this location is as follows: η=Φs-Φ l -U e,1 Here, U e,1 is the equilibrium potential at a specific state of charge (SOC) of the graphite anode.

[0047] Based on the derivation process of the lithium-ion battery impedance spectrum, by linearizing the Butler-Volmer equation, the overpotential of the lithium insertion reaction can be approximated as follows: η ≒ I ct R ct In the formula, I ct is the Faraday current, and R ct is the charge transfer resistance, and when charging, I ct The sign of is negative.

[0048] The equivalent circuit corresponding to the graphite negative electrode has the following relationship: I ct R ct =-V3 where V3 is the charge transfer resistance R ct This is the voltage across both ends of the impedance Z3 in the equivalent circuit shown in Figure 1.

[0049] From the above formula, in order to avoid the occurrence of lithium deposition on the negative electrode surface, the following must be satisfied: V3 e,1 (1)

[0050] The impedance of the impedance Z3 part in the equivalent circuit is related to the current frequency, and the equation is as follows:

[0051]

number

[0052] where Z3 is the impedance of the impedance Z3 part, j is the imaginary unit, ω is the current frequency, and n dl is the constant phase angle element (CPE) index of the impedance Z3 part, and Q dl is the CPE coefficient of the impedance Z3 part.

[0053] ​When a lithium-ion battery is excited by applying AC power, the voltage amplitude across Z3 is: |V3|=I ac |Z3| (3) In the formula, |V3| is the voltage amplitude of the impedance Z3 and is related to the current frequency. I ac is the amplitude of the applied AC current.

[0054] According to formulas (1) and (3), the conditions under which lithium deposition does not occur in a lithium-ion battery when excited by AC power are as follows: I ac |Z3| e,1 (4) That is, the voltage amplitude across the impedance Z3 part in the graphite negative electrode equivalent circuit of the lithium-ion battery (charge transfer resistance R ct The voltage amplitude across the negative electrode (V) is always less than the equilibrium potential of the graphite negative electrode.

[0055] In general, the real and imaginary parts of the positive and negative impedances increase significantly with decreasing temperature, while the real parts of the positive and negative impedances decrease with increasing frequency.

[0056] Based on the negative electrode equivalent circuit parameters obtained by fitting based on equations (2) and (4), the maximum amplitude that can be applied to AC heating currents of different frequencies at different temperatures under conditions that suppress lithium deposition can be calculated to obtain the relationship between the maximum amplitude and frequency of the AC current of a lithium ion battery at different temperatures. FIG. 2 can be used to refer to this amplitude-frequency relationship.

[0057] Since the impedance amplitude of the graphite negative electrode equivalent circuit Z3 portion decreases with increasing temperature and frequency, the maximum allowable AC current amplitude increases with increasing frequency or temperature.

[0058] As shown above, the maximum allowable current increases with increasing frequency, and the real part of the battery impedance increases with decreasing frequency, so the heat generation power P = I 2 ​Based on R, we need to find an equilibrium point in frequency and current that maximizes the heating power, where P is the heating power, I is the current, and R is the resistance.

[0059] Specifically, in the equivalent circuit of a lithium-ion battery shown in Figure 1, as the frequency increases, R ct and R SEI As the current component decreases, a large amount of heat generation power is generated by heat generation in the ohmic internal resistance R0.

[0060] As shown in FIG. 3, FIG. 3 is a schematic diagram showing the maximum heating power when preheating with AC currents of different frequencies at different temperatures under lithium deposition conditions. In an ideal case, R ct This reduces the current through R0 and the voltage is reduced, avoiding lithium deposition, while at the same time allowing a larger total current and generating more heat through R0.

[0061] In the actual process, the heating device (whole-car built-in rapid heating device or external rapid heating device) also has a maximum current amplitude limit. When the maximum current amplitude is set, if the current frequency is too low, it will cause lithium deposition. If the current frequency is too high, the heating power will be small. Therefore, in this case, the frequency has an optimal selection.

[0062] As shown in FIG. 4, FIG. 4 is a schematic diagram showing the selection of the optimal frequency when the AC current amplitude is set. As can be seen from FIG. 4, at the hatched boundary, the maximum heat generation power can be obtained under the condition that the battery does not precipitate lithium, which is the optimal frequency. By selecting the appropriate current amplitude and frequency, the heating efficiency can be maximized.

[0063] However, in the related art, a current amplitude and a frequency for internal heating of a lithium battery are generally specified based on the lowest temperature for which the lithium battery is designed, and in subsequent applications, the lithium battery is heated using the current amplitude and frequency in a fixed manner, thus making it difficult to realize efficient heating of the lithium battery in various environments.

[0064] In order to solve the problems existing in the related art, according to some embodiments of the present application, a battery heating method is provided, as shown in FIG. 5, the method includes: obtaining 501 a first temperature and a first charge state of a battery; determining 502 a first current frequency based on a first predetermined data table including a correspondence relationship between the first temperature, the first charge state, and the first current frequency under the conditions of the first temperature, the first charge state, and the first current amplitude; and heating 503 the battery based on the first current amplitude and the first current frequency.

[0065] In this embodiment, the battery may be a lithium ion battery, a lithium sulfur battery, a sodium ion battery, a magnesium ion battery, etc., but is not specifically limited thereto. For the sake of simplicity, the following description mainly takes the battery as an example of a lithium ion battery.

[0066] The first temperature of the battery may refer to a battery temperature collected in real time and may be collected by an associated temperature sensing device, which may be a temperature within a battery pack in which the battery is located, or may be a temperature of an operating environment in which the battery is located.

[0067] The first charge state may be a real-time SOC of the battery, which may be collected by a battery SOC signal collecting device.

[0068] In some applications, the first temperature and the first charge state may be collected by a Battery Management System (BMS) or the like.

[0069] The first data table may be prepared in advance. In the process of preparing the first data table, the current amplitude may be controlled to change the battery temperature and the battery SOC, and electrochemical impedance spectroscopy (EIS) data of the battery may be obtained under each combination of the battery temperature and the battery SOC. Based on the EIS data, the current frequency under any combination of the battery temperature and the battery SOC may be identified. In general, the current frequency can be used to prevent the battery from undergoing polarization under the corresponding combination of the battery temperature and the battery SOC, while at the same time allowing the battery to be heated internally with high heating power.

[0070] In other words, when creating the first data table, the current amplitude can be measured as a fixed quantity, the battery temperature and the battery SOC as explanatory variables, and the current frequency as a dependent variable.

[0071] Here, the current amplitude in the first data table is specifically controlled to a first current amplitude.

[0072] Combining some examples, the first current amplitude may be determined based on a rated current or a maximum allowable current of a discharge device. For example, if the battery is applied to an electric vehicle, the discharge device may be a motor controller, a charging station, or other energy storage unit, etc., and the first current amplitude may be equal to or slightly smaller than the maximum allowable current of the discharge device.

[0073] The first data table may include a correspondence relationship between a first temperature, a first charge state, and a first current frequency under a first current amplitude condition, and when the first temperature and the first charge state are obtained, the first data table can identify the first current frequency.

[0074] When the first current frequency is identified, the battery can be heated based on the first current amplitude and the first current frequency.

[0075] The first current amplitude and the first current frequency may be target heating parameters or reference heating parameters. For example, in practical application, the battery may be heated at the first current amplitude and the first current frequency, or may be heated at a current amplitude lower than the first current frequency and the first current amplitude.

[0076] In a battery heating method according to an embodiment of the present application, a first temperature and a first charge state of a battery are obtained, a first current frequency is determined based on the first temperature, the first charge state and a predetermined first data table, and the battery is heated based on a first current amplitude and the first current frequency, where the first data table includes a correspondence relationship between the first temperature, the first charge state and the first current frequency under the condition of the first current amplitude. The embodiment of the present application determines a current frequency and amplitude for internal heating based on the temperature of the battery, and can improve the heating rate to the battery in various temperature environments.

[0077] Next, in the embodiment of the present application, since the first current amplitude is predetermined, when the heating parameters of the battery are identified, the consumption of calculation resources due to the identification of the first current amplitude can be saved, and the efficiency of identifying the heating parameters of the battery can be improved. Therefore, it is not necessary to create the first data table for each of various current amplitudes, which is advantageous in reducing the effort required for creating the first data table.

[0078] Also, by specifying the first current amplitude, the lack of limitation on the current amplitude for heating the battery makes it possible to avoid a situation in which lithium deposition in the battery core occurs due to the current amplitude being too high for actually heating the battery.

[0079] In addition, in the embodiment of the present application, the first data table is created under the condition of a first current amplitude, which eliminates the need to create correspondence relationships between battery temperature, battery SOC, and current frequency for each of a plurality of current amplitudes, and is advantageous in reducing the effort required in the process of creating these correspondence relationships.

[0080] With reference to some examples, when creating the first data table, the first current amplitude may be specified first. Take the battery as an example for application to an electric vehicle, the selection of the first current amplitude is related to the maximum overcurrent capability of the heating system, when the electric vehicle's motor controller performs self-discharge, the first current amplitude is generally the maximum overcurrent of the motor electric control, and when the heating is performed by a rapid-heating charging station, the first current amplitude is generally selected as the maximum overcurrent capability of the charging station. Generally, the first current amplitude is the maximum current amplitude achievable under rapid-heating working conditions, and at the same time does not cause safety risks to the heating system, and the first current amplitude is generally specified at the beginning of the system design.

[0081] In one example, the first current amplitude may be 300A, and the safe current frequency of the battery when the SOC is 0% to 100% and the temperature is -30° to 10° can be determined, respectively, and the safe current frequency can be determined based on equations (2) and (4).

[0082] When obtaining the current frequency with the highest heating efficiency (ie, the optimum frequency) through a location test for the battery, the obtained optimum frequency should be equal to or higher than the corresponding safe current frequency.

[0083] A first data table can be obtained based on the orientation test, and the following is an example of the first data table:

[0084] [Table 1]

[0085] It should be noted that each data in the above first data table is an exemplary description. For example, "XHz" represents a frequency value, and the specific value indicated by "X" in each table can be obtained by a location test, and does not specifically refer to a certain value, that is, the values ​​of "X" in different tables can be the same or different. In addition, in practical application, the first current amplitude, the range of the located SOC, or the range of the temperature can be adjusted as necessary.

[0086] According to some embodiments of the present application, the number of the first data tables is N, and the N first data tables are associated with N battery states of health (SOH), where N is an integer greater than 1; Specifically, determining the first current frequency based on the first temperature, the first charge state, and the first predetermined data table includes: Obtaining a first health status of a battery; Identifying a second data table from the N first data tables that is associated with a first health measure; determining a first current frequency based on the first temperature, the first charge state and the second data table.

[0087] Battery SOH can be understood as the percentage of the battery's current capacity versus its shipping capacity. The same battery will have different charge transfer resistances, R, at different SOH states. ct As can be seen from the above analysis of the lithium deposition conditions in lithium-ion batteries, R ct changes, there is a corresponding change in the current amplitude and frequency that can be used to safely heat the lithium ions.

[0088] Therefore, in this embodiment, it is possible to create a first data table corresponding to each of the N SOHs. A method for creating the first data table will not be described here.

[0089] The first state of health of the battery may be understood as the current SOH of the battery, and in some examples, the first state of health of the battery may be obtained by the BMS.

[0090] Since there is an association relationship between the SOH and the first data table, when a first health level is obtained, a second data table related to the first health level can be identified from the N first data tables.

[0091] From another perspective, the second data table is a first data table related to a first health degree, i.e., in the N first data tables. Thus, the second data table may also include a correspondence relationship between a first temperature, a first charge state, and a first current frequency under a condition of a first current amplitude.

[0092] In this embodiment, a first current frequency is determined based on the first temperature, the first charge state and the second data table, and the first current frequency may correspond to the heating parameters of the battery, and the specific application is not described here.

[0093] After the battery SOH decreases, the impedance of the battery increases, and in this embodiment, the SOH is considered as a safety redundancy, which can further improve the reliability of the battery heating process.

[0094] Optionally, heating the battery based on a first current amplitude and a first current frequency includes: heating the battery based on a first current amplitude and a first current frequency from a first time; After heating the battery based on the first current amplitude and the first current frequency, the method further comprises: If a second time is reached whose time period between the first time and the second time is equal to the first predetermined time period, returning to obtaining the first temperature and the first state of charge of the battery.

[0095] In this embodiment, it is considered that the battery is heated every heating cycle.

[0096] For example, in one heating cycle, the above steps 501 to 503 may be executed, and heating of the battery may be maintained for a first predetermined period. The first predetermined period may be set in advance, and a specific value is not limited here.

[0097] After the battery has been heated for the first predetermined period, the next heating cycle may begin, steps 501 to 503 may be repeated, and heating of the battery may again be maintained for the first predetermined period.

[0098] As shown in FIG. 6, FIG. 6 is a diagram showing an example of a battery heating process in this embodiment, in which the abscissa is time and the ordinate is battery temperature.

[0099] FIG. 6 shows three heating cycles on the time axis, which are denoted as heating cycle A, heating cycle B, and heating cycle C, respectively, and the first current frequencies adopted in each heating cycle are the first frequency, the second frequency, and the third frequency, respectively.

[0100] After each heating cycle is completed, the first temperature of the battery changes, and therefore the first current frequency determined based on the first temperature and the first data table generally changes correspondingly, i.e., the first frequency, the second frequency and the third frequency may generally not be equal.

[0101] Generally, the first data table is created with consideration given to safe heating of the battery and maximizing heating efficiency, and in this embodiment, the battery is heated in different heating cycles, and in each heating cycle, the current frequency for heating the battery is adjusted based on the first temperature of the battery, which is advantageous to effectively improve the heating safety and heating efficiency of the battery.

[0102] In some examples, heating of the battery may be terminated if the first temperature of the battery is greater than a temperature threshold or if the number of heating cycles reaches a predetermined number.

[0103] In some examples, the waveform of the current of the heating battery may be one type in the manner of pulse wave, square wave, triangular wave, single frequency sine wave, or superposition of multiple frequency sine waves, etc. That is, in practical applications, there may be differences in the waveform type of the current of the heating battery.

[0104] Typically, the first current frequency is obtained by looking up a first data table, which is typically created based on current conditions for a certain waveform type.

[0105] For example, the current waveform type used when creating the first data table may be a single frequency sine wave. For ease of explanation, the current waveform type used when creating the first data table may be a reference waveform.

[0106] However, in practical applications, the waveform type of the current used in the heating battery may be a pulse wave, a triangular wave, etc. The influence of these waveform types on the lithium deposition of the battery is generally difficult to determine, and in order to ensure the safety of the heating process, when the first current frequency is determined based on the first data table, the first current frequency can be adjusted according to the waveform type of the current used in heating the battery to obtain the second current frequency.

[0107] The adjustment rule of the first current frequency can be set as necessary. For example, if the waveform type of the current for heating the battery is the above-mentioned reference waveform, the first current frequency can be directly set as the second current frequency. If the waveform type of the current for heating the battery is not the reference waveform, the first current frequency can be added to a predetermined frequency or multiplied by a predetermined coefficient to obtain the second current frequency.

[0108] Also, for example, in the adjustment rule, each waveform type may correspond to a predetermined frequency adjustment value or adjustment factor. When obtaining a waveform type of a current for heating a battery, a second current frequency may be obtained by adding a frequency adjustment value corresponding to the waveform type to a first current frequency or multiplying the first current frequency by an adjustment factor corresponding to the waveform type.

[0109] In this embodiment, based on the waveform type of the current for heating the battery, it is possible to adjust the first current frequency identified based on the first data table, obtain the second current frequency, and heat the battery based on the first current amplitude and the second current frequency, which is advantageous to improving the safety of the battery heating process.

[0110] According to some embodiments of the present application, after identifying the first current frequency based on the first temperature, the first charge state, and the first predetermined data table, the method further comprises: When the second current amplitude is acquired, a third current frequency is identified based on the second current amplitude, the third current frequency being a safe current frequency for heating the battery under the condition of the second current amplitude; Heating the battery based on a greater value between the first current frequency and the third current frequency and the second current amplitude.

[0111] Combining the above embodiments, the first current amplitude may be determined based on the maximum allowable current of the discharge device, and the first current amplitude is considered to be an empirical value to some extent. In practical application, different discharge devices may have different maximum allowable currents.

[0112] The second current amplitude here may be the maximum allowable current of the discharge device used in the actual application, or may be a current amplitude specified based on the maximum allowable current of the discharge device used in the actual application.

[0113] As can be seen from equations (2) and (4), when the amplitude of the alternating current increases, the current frequency needs to be correspondingly increased to avoid the occurrence of the lithium precipitation phenomenon and ensure the safety of the battery heating.

[0114] When the second current amplitude is obtained, a safe current frequency, i.e., the third current frequency, can be actually determined according to equations (2) and (4). If the frequency of the current for heating the battery is lower than the third current frequency, it may cause a safety problem in the heating process.

[0115] Therefore, in this embodiment, the battery can be heated according to the larger value between the first current frequency and the third current frequency and the second current amplitude, thus effectively ensuring the safety of the battery heating process under various current amplitude conditions.

[0116] As shown in FIG. 7, the embodiment of the present application further includes: obtaining 701 a second temperature and a second state of charge of the battery; determining 702 a third current amplitude based on a third predetermined data table including a correspondence relationship between the second temperature, the second charge state, and the third current amplitude under the second temperature, the second charge state, and the fourth current frequency; and heating 703 the battery based on a fourth current frequency and a third current amplitude.

[0117] In this embodiment, the battery may be a lithium ion battery, a lithium sulfur battery, a sodium ion battery, a magnesium ion battery, etc., and is not specifically limited here. For the sake of simplicity, the following description will be mainly based on the example of the battery being a lithium ion battery.

[0118] The second temperature of the battery may refer to a real-time collected battery temperature or may be collected by an associated temperature sensing device, the second temperature may be a temperature within a battery pack in which the battery is located, or may be a temperature of an operating environment in which the battery is located.

[0119] The second charge state may be the real-time SOC of the battery, which may be collected by a battery SOC signal collecting device.

[0120] In some applications, the second temperature and second charge state may be collected by a BMS or the like.

[0121] The third data table may be prepared in advance. In the process of preparing the third data table, the current frequency can be controlled to change the battery temperature and the battery SOC, and the EIS data of the battery can be obtained for each combination of the battery temperature and the battery SOC. Based on the EIS data, the current amplitude for any combination of the battery temperature and the battery SOC can be determined. In general, the current amplitude can be determined so that the battery does not experience polarization phenomenon at the corresponding combination of the battery temperature and the battery SOC, and at the same time, the battery can be internally heated with high heating power.

[0122] In other words, when creating the third data table, the current frequency can be measured as a fixed quantity, the battery temperature and the battery SOC as explanatory variables, and the current amplitude as a dependent variable.

[0123] Here, the current frequency in the third data table is specifically controlled to a fourth current frequency.

[0124] The third data table may include a correspondence relationship between the second temperature, the second charge state, and the third current amplitude under a fourth current frequency condition. Given the second temperature and the second charge state, the third data table may identify the third current amplitude.

[0125] If a third current amplitude is identified, the battery may be heated based on a fourth current frequency and the third current amplitude.

[0126] The fourth current frequency and the third current amplitude may be target heating parameters or reference heating parameters. For example, in practical application, the battery may be heated at the fourth current frequency and the third current amplitude, or may be heated at a current frequency higher than the third current amplitude and the fourth current frequency.

[0127] A battery heating method according to an embodiment of the present application includes obtaining a second temperature and a second charge state of the battery, determining a third current amplitude based on the second temperature, the second charge state and a predetermined third data table, and heating the battery based on a fourth current frequency and the third current amplitude, where the third data table includes a correspondence relationship between the second temperature, the second charge state and the third current amplitude under the condition of the fourth current frequency. The embodiment of the present application determines a current frequency and amplitude for internal heating based on the temperature of the battery, and can improve the heating rate to the battery in various temperature environments.

[0128] Next, in the embodiment of the present application, since the fourth current frequency is specified in advance, when the heating parameters of the battery are specified, the consumption of calculation resources due to the specification of the fourth current frequency can be saved, and the efficiency of specifying the heating parameters of the battery can be improved. And, it is not necessary to create the third data table for each of various current frequencies, which is advantageous in reducing the effort required for creating the third data table.

[0129] Additionally, by specifying the first current amplitude, the lack of limitation on the current frequency for heating the battery can avoid a situation where the current frequency is too high to actually heat the battery.

[0130] At the same time, in the embodiment of the present application, the third data table is created under the condition of a fourth current frequency, which eliminates the need to create correspondence relationships between the battery temperature, battery SOC, and current amplitude for each of a plurality of current frequencies, and is advantageous in reducing the effort required in the process of creating these correspondence relationships.

[0131] According to some embodiments of the present application, after determining the third current amplitude, the method further comprises: Obtaining an output voltage of a battery; if the output voltage is less than the voltage threshold, heating the battery based on a predetermined fifth current frequency and a third current amplitude; Heating the battery based on a fourth current frequency and a third current amplitude if the output voltage is greater than or equal to the voltage threshold, heating the battery based on a fourth current frequency and a third current amplitude; Here, the fifth current frequency is greater than the fourth current frequency.

[0132] In practical applications, the battery may be heated by a discharging device and at the same time supply power to a user device, and therefore the battery has an output voltage that is obtained by a voltage sensor device or the like.

[0133] In one embodiment, the fourth current frequency may be a predetermined low frequency value. In the process of performing internal heating on the battery, if the output voltage of the battery is low, the battery may drop below a safe voltage if it continues to be discharged.

[0134] The voltage threshold is considered as a threshold for determining whether the battery is within a safe voltage range.

[0135] If the battery's output voltage is less than the voltage threshold, the battery is considered not to be in the safe voltage range and continued discharging may cause the battery to drop below the safe voltage.

[0136] In this embodiment, when the output voltage of the battery is less than the voltage threshold, a fifth higher current frequency may be adopted to provide internal heating to the battery.

[0137] As can be seen from equation (2), as the current frequency increases, the impedance of the battery decreases, ensuring that the battery is within the safe voltage range while discharging, which is favorable for improving the safety of the internal heating process of the battery.

[0138] The fifth current frequency can be set as necessary, and specifically may be an empirical value, or may be obtained by calibration for the charging and discharging process of the battery, and the description thereof will be omitted here.

[0139] When the output voltage of the battery is equal to or greater than the voltage threshold, it is believed that, to a certain extent, there is no situation in which the output voltage of the battery drops below the safe voltage range during discharging, and in this case, the battery can be heated based on a relatively low fourth current frequency and third current amplitude to ensure heating efficiency to the battery.

[0140] In one embodiment, after heating the battery based on a predetermined fifth current frequency and a third current amplitude when the output voltage is less than the voltage threshold, the battery may be further heated based on a fourth current frequency and a third current amplitude when the second temperature of the battery rises to a predetermined temperature value.

[0141] According to some embodiments of the present application, the third current amplitude is specifically a forward current amplitude,

[0142] Specifically, heating the battery based on the fourth current frequency and the third current amplitude includes: Heating the battery based on a fourth current frequency, a third current amplitude and the predetermined first reverse current amplitude.

[0143] In general, forward current may refer to the current when the battery is in a charging state, and reverse current may refer to the current when the battery is in a discharging state.

[0144] When the battery is heated internally, it is generally the forward current that brings about safety problems such as lithium precipitation. Therefore, in this embodiment, the third current amplitude that needs to be specified may be the forward current amplitude, and when the battery is heated based on the third current amplitude and the fourth current frequency, the occurrence of safety problems should be avoided.

[0145] Correspondingly, the reverse current has little effect on safety due to lithium deposition in the battery, and therefore the amplitude may be specified to a predetermined value, that is, the first reverse current amplitude.

[0146] For example, in one example, the first reverse current amplitude may be a maximum allowable current amplitude of the power consuming device, which is already specified when designing the power consuming device. Of course, in other examples, the first reverse current amplitude may also be an empirical value.

[0147] In this embodiment, the third current amplitude identified based on the third data table is specifically a forward current amplitude, and the battery is heated based on the fourth current frequency, the third current amplitude and the predetermined first reverse current amplitude, which is beneficial to improving the heating efficiency, and at the same time ensuring the safety of the battery heating process and reducing the requirements for the frequency conversion width of the heating device.

[0148] According to some embodiments of the present application, after identifying the third current amplitude, the method further comprises: Obtaining an output voltage of a battery; if the output voltage is less than the voltage threshold, heating the battery based on a fourth current frequency, a third current amplitude, and a second predetermined reverse current amplitude; Specifically, heating the battery based on the fourth current frequency, the third current amplitude, and the predetermined first reverse current amplitude includes: if the output voltage is equal to or greater than the voltage threshold, heating the battery based on a fourth current frequency, a third current amplitude, and a first predetermined reverse current amplitude; Here, the first reverse current amplitude is greater than the second reverse current amplitude.

[0149] Combining the above embodiments, it can be seen that in the process of performing internal heating on a battery, if the output voltage of the battery is low, the battery may drop below a safe voltage if it continues to be discharged.

[0150] Whether the battery output voltage is low may be determined based on a comparison of the output voltage with a voltage threshold.

[0151] When the output voltage of the battery is equal to or greater than the voltage threshold, it is considered that, to a certain extent, there is no situation in which the output voltage of the battery drops below the safe voltage range during discharging, and in this case, the battery is heated based on the fourth current frequency, the third current amplitude and the predetermined first reverse current amplitude, so as to ensure the heating efficiency of the battery and at the same time ensure the normal use of the power consumption device.

[0152] When the battery output voltage is less than the voltage threshold, the amplitude of the output current needs to be controlled, ie, the reverse current amplitude is reduced.

[0153] Specifically, when the output voltage is less than the voltage threshold, the battery is heated based on a fourth current frequency, a third current amplitude and a predetermined second reverse current amplitude, and the second reverse current amplitude is less than the first reverse current amplitude, which is advantageous for avoiding safety issues caused by over-discharging the battery and for extending the service life of the battery.

[0154] According to some embodiments of the present application, the number of third data tables is M, and the M third data tables are associated with M battery health states, where M is an integer greater than 1; determining a third current amplitude based on the second temperature, the second charge state, and a third predetermined data table; Obtaining a second state of health of the battery; and identifying a fourth data table from the M third data tables related to the second health measure; determining a third current amplitude based on the second temperature, the second charge state and a fourth data table.

[0155] Combining the above examples, the same battery has different SOH states and different charge transfer resistances R ct As can be seen from the above analysis of the lithium deposition conditions in lithium-ion batteries, R ctchanges, there is a corresponding change in the current amplitude and frequency that can be used to safely heat the lithium ions.

[0156] In this embodiment, a third data table may be created corresponding to each of the M SOHs. A method for creating the third data table will not be described here.

[0157] The second state of health of the battery may be understood to be the current SOH of the battery, and in some examples, the second state of health of the battery may be obtained by the BMS.

[0158] Since there is an association relationship between the SOH and the third data table, when the second health level is obtained, a fourth data table related to the second health level may be identified from the M third data tables.

[0159] From another perspective, the fourth data table is a third data table related to the second health degree, i.e., in the N third data tables, and thus the fourth data table can also include a correspondence relationship between the second temperature, the second charge state, and the third current amplitude under a fourth current frequency condition.

[0160] In this embodiment, a third current amplitude is determined based on the second temperature, the second charge state, and the fourth data table, and the third current amplitude can correspond to the heating parameters of the battery, and the specific application is not described here.

[0161] After the battery SOH is reduced, the impedance of the battery can be increased, and in this embodiment, the SOH is considered as a safety redundancy, which can further improve the reliability of the battery heating process.

[0162] According to some embodiments of the present application, heating the battery based on a fourth current frequency and a third current amplitude includes: heating the battery based on a fourth current frequency and a third current amplitude from a third time; After heating the battery based on the fourth current frequency and the third current amplitude, the method further comprises: If a fourth time is reached whose period between the third time and the fourth time is equal to the second predetermined period, returning to obtaining a second temperature and a second state of charge of the battery.

[0163] In this embodiment, it is considered that the battery is heated every heating cycle.

[0164] For example, in one heating cycle, the above steps 701 to 703 may be executed, and heating of the battery may be maintained for a second predetermined period. The second predetermined period may be set in advance, and a specific value is not limited here.

[0165] After the battery is heated for the second predetermined period, the next heating cycle may be entered, steps 701 to 703 may be repeated, and heating of the battery may again be maintained for the second predetermined period.

[0166] As shown in FIG. 8, FIG. 8 is a diagram showing another example of a battery heating process in this embodiment, and in the coordinate system located at the top of the diagram, the abscissa is time and the ordinate is battery temperature.

[0167] 8 shows three heating cycles on the time axis, which are designated as heating cycle A', heating cycle B', and heating cycle C'. The current frequency employed in each heating cycle may be equal, but the current amplitude may vary continuously.

[0168] 8, in which the abscissa is time and the ordinate is current amplitude. As can be seen, the frequency of the current remains unchanged, and in heating cycle A', heating cycle B' and heating cycle C', the forward current amplitude can be continuously increased, and the reverse current amplitude can be kept unchanged.

[0169] Of course, in other examples, the reverse current amplitude may be adjusted as the heating cycle progresses.

[0170] Generally, the third data table is created with consideration given to the safe heating and maximization of the heating efficiency of the battery, and in this embodiment, the battery is heated in different heating cycles, and in each heating cycle, the current amplitude for heating the battery is adjusted based on the second temperature of the battery, which is advantageous to effectively improve the heating safety and heating efficiency of the battery.

[0171] In the example shown in FIG. 8, the waveform of the current for heating the battery is a square wave, and in practical applications, the waveform type of the current for heating the battery may be at least one of pulse wave, square wave, triangular wave, single-frequency sine wave, or superposition of multiple-frequency sine waves.

[0172] Of course, in some embodiments, in order to further improve the safety of the battery heating process, the third current amplitude may be adjusted according to the waveform type, and the battery may be heated based on the fourth current frequency and the adjusted third current amplitude.

[0173] For example, the current waveform adopted when creating the third data table is a single-frequency sine wave, and the single-frequency sine wave is called the reference waveform. The adjustment rule may include, when the waveform type for heating the battery is not the reference waveform, subtracting a predetermined current amplitude from the specified third current amplitude, or multiplying by a positive coefficient less than 1, etc.

[0174] According to some embodiments of the present application, as shown in Fig. 9, Fig. 9 is a schematic diagram of a heating system for heating a battery. The heating system may include a battery pack and a power source.

[0175] The battery pack may include a battery and a BMS, and the BMS includes various types of sensing units, such as a current collecting unit, a voltage collecting unit, and a temperature collecting unit, etc. Of course, the BMS may further include a SOC signal collecting device, a SOH signal collecting device, etc.

[0176] For example, when the battery pack is applied to an electric vehicle, the power source may be a charging station or a motor controller, etc.

[0177] In practical application, the BMS may collect data such as the temperature, SOC, etc. of the battery, and generate related heating parameters, such as the current frequency and current amplitude, based on the collected data. The heating parameters may be sent to the power supply, for example, via a communication module on a signal line, so that the power supply controls to heat the battery according to the heating parameters.

[0178] According to some embodiments of the present application, as shown in Fig. 10, Fig. 10 is a schematic diagram of another heating system for heating a battery, which may include a battery pack, a voltage conversion module and an energy storage unit.

[0179] The functions of the battery pack and the BMS have been described in the previous embodiment, and will not be described here.

[0180] The energy storage unit may be a wind energy storage unit or a solar energy storage unit, etc. Or, when the battery pack is applied to an electric vehicle, the energy storage unit may be various kinds of electronic components for energy storage in the electric vehicle.

[0181] The voltage transformation module is used to transform the voltage output from the energy storage unit. The BMS may be in communication with the voltage transformation module and controls operation of the voltage transformation module based on the identified heating parameters.

[0182] As shown in FIG. 11, the embodiment of the present application further includes: a first acquisition module 1101 for acquiring a first temperature and a first charge state of the battery; a first determination module 1102 for determining a first current frequency based on a first predetermined data table including a correspondence relationship between the first temperature, the first charge state, and the first current frequency under the conditions of the first temperature, the first charge state, and the first current amplitude; A battery heating device 1100 is provided that includes a first heating control module 1103 for heating the battery based on a first current amplitude and a first current frequency.

[0183] According to some embodiments of the present application, the number of the first data tables is N, and the N first data tables are associated with N battery health states, where N is an integer greater than 1; The first identification module 1102 includes: A first acquisition unit for acquiring a first state of health of the battery; A first identification unit for identifying a second data table related to a first health degree from the N first data tables; and a second determining unit for determining the first current frequency based on the first temperature, the first charge state, and the second data table.

[0184] According to some embodiments of the present application, the first heating control module 1103 may include: a first heating control unit for heating the battery based on a first current amplitude and a first current frequency from a first time; In response to this, the battery heating device 1100 further comprises: The method may include a first execution module for returning to the step of obtaining the first temperature and the first state of charge of the battery when a second time is reached where the period between the first time and the second time is equal to the first predetermined period.

[0185] According to some embodiments of the present application, the battery heating device 1100 may further include: a third acquisition module that, when the second current amplitude is acquired, identifies a third current frequency based on the second current amplitude, the third current frequency being a safe current frequency for heating the battery under a condition of the second current amplitude; and a third heating control module that heats the battery based on a greater value between the first current frequency and the third current frequency and the second current amplitude.

[0186] As shown in FIG. 12, the embodiment of the present application further includes: a second acquisition module 1201 for acquiring a second temperature and a second charge state of the battery; a second determination module 1202 for determining a third current amplitude based on a third predetermined data table including a correspondence relationship between the second temperature, the second charge state, and the third current amplitude under the conditions of the second temperature, the second charge state, and the fourth current frequency; and a second heating control module 1203 for heating the battery based on a fourth current frequency and a third current amplitude.

[0187] According to some embodiments of the present application, the battery heating device 1200 may further include: a fourth acquisition module for acquiring an output voltage of the battery;

[0188] and a fourth heating control module that heats the battery based on a predetermined fifth current frequency and a third current amplitude when the output voltage is less than the voltage threshold; In response, the second heating control module 1203 heats the battery based on a fourth current frequency and a third current amplitude when the output voltage is equal to or greater than the voltage threshold; Here, the fifth current frequency is greater than the fourth current frequency.

[0189] According to some embodiments of the present application, the third current amplitude is a forward current amplitude; In response, the second heating control module 1203: A second heating control unit is included to heat the battery based on the fourth current frequency, the third current amplitude and the predetermined first reverse current amplitude.

[0190] According to some embodiments of the present application, the battery heating device 1200 may further include: a fifth acquisition module for acquiring an output voltage of the battery; and a fifth heating control module that heats the battery based on a fourth current frequency, a third current amplitude, and a second predetermined reverse current amplitude when the output voltage is less than the voltage threshold; In response, the second heating control module 1203 heats the battery based on a fourth current frequency, a third current amplitude, and a first predetermined reverse current amplitude when the output voltage is equal to or greater than the voltage threshold; Here, the first reverse current amplitude is greater than the second reverse current amplitude.

[0191] According to some embodiments of the present application, the number of the third data tables is M, and the M third data tables are associated with M battery health states, where M is an integer greater than one.

[0192] According to some embodiments of the present application, the second identification module 1202 may include: a second acquisition unit for acquiring a second state of health of the battery; a third identification unit for identifying a fourth data table related to the second health degree from the M third data tables; and a fourth determining unit for determining a third current amplitude based on the second temperature, the second charge state, and the fourth data table.

[0193] According to some embodiments of the present application, the second heating control module 1203 may include: a third heating control unit for heating the battery based on a fourth current frequency and a third current amplitude from a third time; In response to this, the battery heating device 1200 further comprises: The method may include a second execution module that returns to obtaining a second temperature and a second state of charge of the battery when a fourth time is reached where the period between the fourth time and the third time is equal to the second predetermined period.

[0194] Furthermore, the battery heating device is an apparatus corresponding to the above-mentioned battery heating method, and all the implementation methods in the above-mentioned method embodiments can be applied to the embodiments of the device to achieve the same technical effects.

[0195] FIG. 13 shows a hardware structural diagram of an electronic device according to an embodiment of the present application.

[0196] The electronic device may include a processor 1301 and a memory 1302 that stores computer program instructions.

[0197] In particular, the processor 1301 may include a central processing unit (CPU) or an application specific integrated circuit (ASIC), or may be configured in one or more integrated circuits that implement embodiments of the present application.

[0198] Memory 1302 may include mass memory for data and instructions. For example, and without limitation, memory 1302 may include a hard disk drive (HDD), a floppy disk drive, flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a Universal Serial Bus (USB) drive, or a combination of two or more thereof. Where appropriate, memory 1302 may include removable or non-removable (or fixed) media. Where appropriate, memory 1302 may be located internal or external to the unified gateway disaster recovery device. In certain embodiments, memory 1302 is a non-volatile solid-state memory.

[0199] Memory may include read-only memory (ROM), random access memory (RAM), disk storage media devices, optical storage media devices, flash memory devices, electrical, optical, or other physical / tangible memory storage devices. Thus, generally, memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software that includes computer-executable instructions, and when the software is executed (e.g., by one or more processors), it can operate to perform the operations described according to the methods of the present disclosure.

[0200] The processor 1301 reads and executes computer program instructions stored in the memory 1302 to realize the battery heating method of any of the above embodiments.

[0201] In one example, the electronic device may further include a communication interface 1303 and a bus 1304. Here, as shown in FIG. 13, the processor 1301, the memory 1302, and the communication interface 1303 are connected via the bus 1304 and complete communication between them.

[0202] The communication interface 1303 is mainly used to realize communication between the modules, apparatuses, units and / or devices in the embodiment of the present application.

[0203] Bus 1304 may include hardware, software, or both. By way of example only, and not limitation, a bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front End Bus (FSB), a Super Transport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an Infinite Bandwidth Interconnect, a Low Pin Count (LPC) bus, a memory bus, a MicroChannel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial High Technology Accessory (SATA) bus, a Video Electronics Standards Association Local (VLB) bus, or any other suitable bus, or a combination of two or more thereof. Where appropriate, bus 1304 may include one or more buses. Although embodiments herein have described and illustrated particular buses, this application contemplates any suitable bus or interconnect.

[0204] In addition, by combining the battery heating method in the above embodiments, the embodiments of the present application can be realized by providing a computer storage medium having computer program instructions stored therein, which, when executed by a processor, realizes any of the battery heating methods in the above embodiments.

[0205] It is necessary to clarify that the present application is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted herein. In the above embodiments, some specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art may make various changes, modifications, and additions, or change the order between steps after understanding the spirit of the present application.

[0206] The functional blocks shown in the above block diagrams can be realized as hardware, software, firmware, or a combination of these. When realized in a hardware manner, it may be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, or the like. When realized in a software manner, the elements of the present application are programs or code segments used to perform the necessary tasks. The programs or code segments may be stored in a machine-readable medium or transmitted by a data signal carried on a carrier over a transmission medium or a communication link. The "machine-readable medium" may include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROMs, flash memories, erasable ROMs (EROMs), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, and the like. The code segments may be downloaded over a computer network, such as the Internet or an intranet.

[0207] It should be further explained that the exemplary embodiments mentioned herein describe some methods or systems based on a sequence of steps or devices, however, the present application is not limited to the order of steps mentioned above, i.e. steps may be performed according to the order mentioned in the embodiments, may be performed in a different order than in the embodiments, or multiple steps may be performed simultaneously.

[0208] The above describes each aspect of the present disclosure with reference to flowcharts and / or block diagrams of the method, apparatus (system), and program according to the embodiments of the present disclosure. As will be understood, each block in the flowcharts and / or block diagrams and combinations of each block in the flowcharts and / or block diagrams can be realized by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, a special purpose computer, or other programmable data processing device to generate a machine such that these instructions executed by the processor of the computer or other programmable data processing device can realize the function / operation specified in one or more blocks in the flowcharts and / or block diagrams. Such a processor may be, but is not limited to, a general purpose processor, a special purpose processor, a special application processor, or a field programmable logic circuit. As will be further understood, each block in the block diagrams and / or flowcharts and combinations of blocks in the block diagrams and / or flowcharts can be realized by dedicated hardware performing the specified function or operation, or by a combination of dedicated hardware and computer commands.

[0209] The above is only a specific embodiment of the present application, and those skilled in the art can clearly understand that for convenience and simplicity of description, the specific operation processes of the above-described systems, modules and units can refer to the corresponding processes in the above-described method examples, and the description will be omitted here. It should be understood that the protection scope of the present application is not limited thereto, and those skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and all of these modifications or replacements should be included in the protection scope of the present application.

Claims

1. A battery heating method, comprising: acquiring a first temperature and a first charge state of the battery; a determining step of determining the first current frequency based on the conditions of the first temperature, the first charge state, and the first current amplitude by using a predetermined first data table including a correspondence relationship between the first temperature, the first charge state, a first current amplitude that is a predetermined fixed value, and a first current frequency; a heating step of heating the battery based on the first current amplitude and the first current frequency; Including, A battery heating method comprising:

2. The number of the first data tables is N, and the N first data tables are associated with N battery health states, where N is an integer greater than 1; The identifying step includes: Obtaining a first state of health of the battery; Identifying a second data table associated with the first health level from the N first data tables; determining a first current frequency based on the first temperature, the first charge state and the second data table; Including, The battery heating method according to claim 1 .

3. The heating step comprises: heating the battery based on the first current amplitude and the first current frequency from a first time; After heating the battery based on the first current amplitude and the first current frequency, the method further comprises: returning to the step of obtaining a first temperature and a first state of charge of the battery when a second time is reached whose time period between the first time and the second time is equal to a first predetermined time period. The battery heating method according to claim 1 .

4. After the identifying step, the method further comprises: When a second current amplitude is acquired, a third current frequency is identified based on the second current amplitude, the third current frequency being a safe current frequency for heating the battery under the condition of the second current amplitude; heating the battery based on a greater value between the first current frequency and the third current frequency and the second current amplitude; Including, The battery heating method according to claim 1 .

5. A battery heating method, comprising: acquiring a second temperature and a second state of charge of the battery; determining the third current amplitude based on the conditions of the second temperature, the second charge state, and the fourth current frequency by using a third predetermined data table including a correspondence relationship between the second temperature, the second charge state, and a fourth current frequency that is a predetermined fixed value, and a third current amplitude; a heating step of heating the battery based on the fourth current frequency and the third current amplitude; Including, Battery heating method.

6. After the identifying step, the method further comprises: obtaining an output voltage of the battery; if the output voltage is less than a voltage threshold, heating the battery based on a fifth predetermined current frequency and the third current amplitude; Including, Heating the battery based on the fourth current frequency and the third current amplitude includes: heating the battery based on the fourth current frequency and the third current amplitude when the output voltage is greater than or equal to the voltage threshold; the fifth current frequency is greater than the fourth current frequency; The battery heating method according to claim 5 .

7. the third current amplitude is a forward current amplitude; The heating step comprises: heating the battery based on the fourth current frequency, the third current amplitude, and a first predetermined reverse current amplitude. The battery heating method according to claim 5 .

8. After the identifying step, the method further comprises: obtaining an output voltage of the battery; heating the battery based on the fourth current frequency, the third current amplitude, and a second predetermined reverse current amplitude if the output voltage is less than a voltage threshold; Including, Heating the battery based on the fourth current frequency, the third current amplitude, and the first predetermined reverse current amplitude specifically includes: heating the battery based on the fourth current frequency, the third current amplitude and a first predetermined reverse current amplitude when the output voltage is equal to or greater than the voltage threshold; the first reverse current amplitude is greater than the second reverse current amplitude; The battery heating method according to claim 7.

9. the number of the third data tables is M, the M third data tables are associated with M battery health states, and M is an integer greater than 1; The identifying step includes: Obtaining a second state of health of the battery; Identifying a fourth data table associated with the second health level from the M third data tables; determining a third current amplitude based on the second temperature, the second charge state and the fourth data table; Including, The battery heating method according to claim 5 .

10. The heating step comprises: heating the battery based on the fourth current frequency and the third current amplitude from a third time; After the heating step, the method further comprises: returning to the step of obtaining a second temperature and a second state of charge of the battery when a fourth time is reached whose time period between the third time and the fourth time is equal to a second predetermined time period. The battery heating method according to claim 5 .

11. A battery heating device, comprising: a first acquisition module for acquiring a first temperature and a first charge state of the battery; a first determination module that determines the first current frequency based on the conditions of the first temperature, the first charge state, and the first current amplitude using a first predetermined data table including a correspondence relationship between the first temperature, the first charge state, a first current amplitude that is a predetermined fixed value, and a first current frequency; a first heating control module that heats the battery based on the first current amplitude and the first current frequency; Equipped with Battery heating device.

12. A battery heating device, comprising: a second acquisition module for acquiring a second temperature and a second charge state of the battery; a second determination module that determines the third current amplitude based on the second temperature, the second charge state, and the fourth current frequency using a third predetermined data table including a correspondence relationship between the second temperature, the second charge state, a fourth current frequency that is a predetermined fixed value, and a third current amplitude; and a second heating control module that heats the battery based on the fourth current frequency and the third current amplitude; Equipped with Battery heating device.

13. 1. An electronic device comprising: a processor and a memory having computer program instructions stored thereon; The processor, when executing the computer program instructions, realizes the battery heating method according to any one of claims 1 to 4, or realizes the battery heating method according to any one of claims 5 to 10. Electronic devices.

14. 1. A computer storage medium, comprising: The computer storage medium stores computer program instructions, and when the computer program instructions are executed by a processor, the battery heating method according to any one of claims 1 to 4 is realized, or the battery heating method according to any one of claims 5 to 10 is realized. Computer storage media.

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