Method, device and electronic equipment for determining discharge power

Abstract

The present invention provides a method, device and electronic device for determining discharge power, which relate to the technical field of battery pack application, including: obtaining the initial internal resistance value of a battery cell or battery module that meets a preset application time requirement and a power spectrum corresponding to the initial internal resistance value; determining the current internal resistance value of the battery cell or battery module under cycle durability conditions and storage durability conditions based on the initial internal resistance value and a preset internal resistance growth model; determining the discharge power of the current battery pack according to the power spectrum, current internal resistance value and initial internal resistance value corresponding to the battery cell or battery module, wherein the current battery pack is assembled from battery cells or battery modules, and solves the technical problem of power loss of electric vehicles while ensuring the service life of the battery pack.

Description

Technical Field

[0001] The present invention relates to the technical field of battery pack applications, and in particular to a method, device and electronic equipment for determining discharge power. Background Art

[0002] With the development of vehicle technology, electric vehicles have been widely used. In order to ensure that the battery pack of electric vehicles will not be over-discharged and other situations that affect the life of the battery pack, the vehicle motor output power is generally controlled to be less than the discharge power of the battery pack.

[0003] However, the inventors have found that the discharge power of the battery pack is not accurately obtained in actual applications. Therefore, in order to ensure the safety of the battery pack of the electric vehicle, the motor output power is often further controlled by a safety factor based on the actual discharge power. Although this method ensures the service life of the battery pack to a certain extent, it undoubtedly loses the power performance of the electric vehicle. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a method, device and electronic equipment for determining discharge power, which solve the technical problem of power loss of electric vehicles while ensuring the service life of the battery pack.

[0005] In a first aspect, an embodiment provides a method for determining a discharge power, the method comprising:

[0006] Obtaining an initial internal resistance value of a battery cell or battery module that meets a preset application duration requirement and a power spectrum corresponding to the initial internal resistance value;

[0007] Based on the initial internal resistance value and a preset internal resistance growth model, determining a current internal resistance value of the battery cell or the battery module under a cycle durability condition and a storage durability condition;

[0008] The discharge power of a current battery pack is determined according to a power spectrum corresponding to the battery cell or the battery module, the current internal resistance value, and the initial internal resistance value, wherein the current battery pack is assembled from the battery cell or the battery module.

[0009] In an optional embodiment, the step of determining the current internal resistance value of the battery cell or the battery module under the cycle durability condition and the storage durability condition based on the initial internal resistance value and the preset internal resistance growth model includes:

[0010] According to a preset internal resistance growth model, determining the internal resistance increase percentage of the battery cell under a cycle durability condition and a storage durability condition respectively;

[0011] Based on the internal resistance increase percentage and the initial internal resistance value of the battery cell, a current internal resistance value of the battery cell is determined.

[0012] In an optional embodiment, the step of determining the current internal resistance value of the battery cell or the battery module under the cycle durability condition and the storage durability condition based on the initial internal resistance value and the preset internal resistance growth model includes:

[0013] According to a preset internal resistance growth model and a clamping force correction coefficient, determining the internal resistance increase percentage of the battery module under a cycle durability condition and a storage durability condition respectively;

[0014] Based on the internal resistance increase percentage and the initial internal resistance value of the battery cell, a current internal resistance value of the battery module is determined.

[0015] In an optional embodiment, the step of determining the current discharge power of the battery pack according to the power spectrum corresponding to the battery cell or the battery module, the current internal resistance value and the initial internal resistance value includes:

[0016] According to the current internal resistance value and the initial internal resistance value, each discharge power in the power spectrum is updated to obtain a current power spectrum corresponding to the current internal resistance value;

[0017] The discharge power of the battery pack is determined according to a current power spectrum corresponding to a current internal resistance value of the battery cell or the battery module.

[0018] In an optional embodiment, the step of determining the discharge power of the battery pack according to the current power spectrum corresponding to the current internal resistance value of the battery cell or the battery module includes:

[0019] According to each discharge power in the current power spectrum corresponding to the current internal resistance value of the battery cell, the internal resistance consistency deviation, the system voltage deviation and the application loss, the respective discharge powers corresponding to the battery pack are determined, and the power spectrum of the battery pack is generated.

[0020] In an optional embodiment, the step of determining the discharge power of the battery pack according to the current power spectrum corresponding to the current internal resistance value of the battery cell or the battery module further includes:

[0021] Determining a cell assembly type of the battery module based on a target required power for the battery pack;

[0022] Determine, according to the battery cell assembly type, each discharge power in the current power spectrum corresponding to the current internal resistance value of the battery module, wherein the discharge power of the battery module is the discharge power generated by the battery cell with the smallest discharge power in the battery module;

[0023] According to each of the discharge powers, the system voltage deviation and the application loss, the respective discharge powers corresponding to the battery pack are determined, and a power spectrum of the battery pack is generated.

[0024] In an optional embodiment, the method further comprises:

[0025] The current discharge power of the battery pack is sent to a vehicle motor, and the output power of the vehicle motor is controlled based on the discharge power.

[0026] In a second aspect, an embodiment provides a device for determining discharge power, the device comprising:

[0027] An acquisition module is used to acquire an initial internal resistance value of a battery cell or a battery module that meets a preset application duration requirement and a power spectrum corresponding to the initial internal resistance value;

[0028] A first determination module determines a current internal resistance value of the battery cell or the battery module under a cycle durability condition and a storage durability condition based on the initial internal resistance value and a preset internal resistance growth model;

[0029] The second determination module determines the discharge power of the current battery pack according to the power spectrum corresponding to the battery cell or the battery module, the current internal resistance value and the initial internal resistance value, wherein the current battery pack is assembled from the battery cell or the battery module.

[0030] In a third aspect, an embodiment provides an electronic device, including a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and when the processor executes the computer program, the steps of the method described in any of the aforementioned implementation methods are implemented.

[0031] In a fourth aspect, an embodiment provides a machine-readable storage medium, wherein the machine-readable storage medium stores machine-executable instructions. When the machine-executable instructions are called and executed by a processor, the machine-executable instructions prompt the processor to implement the steps of the method described in any one of the aforementioned implementations.

[0032] A method, device and electronic device for determining discharge power provided by an embodiment of the present invention first obtain an initial internal resistance value and a power spectrum for a preset application time, then determine the precise internal resistance value of a battery cell or module constituting a battery pack through the initial internal resistance value and a preset internal resistance growth model, and then calculate the discharge power of the battery cell or module that meets the preset application time requirement in combination with the initial discharge power in the power spectrum, and then further determine the discharge power of the current battery pack so that the electric vehicle can control the application based on this discharge power.

[0033] Other features and advantages of the present disclosure will be set forth in the following description, or some features and advantages may be inferred or unambiguously determined from the description, or may be learned by implementing the above-mentioned technology of the present disclosure.

[0034] In order to make the above-mentioned objectives, features and advantages of the present disclosure more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 A flow chart of a method for determining discharge power provided by an embodiment of the present invention;

[0037] Figure 2 A schematic diagram of an internal resistance growth rate fitting curve provided by an embodiment of the present invention;

[0038] Figure 3 A functional module diagram of a device for determining discharge power provided by an embodiment of the present invention;

[0039] Figure 4 A schematic diagram of the hardware architecture of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] The inventors have found that the current control of the vehicle motor output power based on the battery pack discharge power will result in a certain loss of vehicle power performance. Specifically, it is known that the internal resistance of the battery pack will change during use, which will cause the currently determined battery pack discharge power to be inaccurate. While the motor output power is currently controlled based on the discharge power, a safety factor greater than 1 is also set, so that the product of the output power and the safety factor meets the requirement of being less than the discharge power, thereby ensuring the safety of the battery pack. Although this method ensures that the defect of over-discharge of the battery pack is avoided, it is equivalent to reducing the maximum output power of the electric vehicle, which causes a loss of the vehicle's power performance.

[0042] Based on this, an embodiment of the present invention provides a method, device and electronic device for determining discharge power, which determines a more accurate battery internal resistance and thus obtains a more accurate battery pack discharge power, thereby saving the application of safety factors to ensure that the vehicle output power can both meet the discharge power requirements and solve the problem of power loss.

[0043] To facilitate understanding of this embodiment, a method for determining discharge power disclosed in an embodiment of the present invention is first introduced in detail. This method can be applied to a vehicle controller, such as a battery management system (Battery Management System) or other intelligent control devices, such as a host computer, a server, etc.

[0044] Figure 1 A flow chart of a method for determining discharge power provided by an embodiment of the present invention.

[0045] like Figure 1 As shown, the method comprises the following steps:

[0046] Step S102, obtaining an initial internal resistance value of a battery cell or battery module that meets a preset application duration requirement and a power spectrum corresponding to the initial internal resistance value.

[0047] Among them, the initial internal resistance value and power spectrum of battery cells or modules with different application durations are different. During the application process, the corresponding initial internal resistance value and power spectrum are obtained according to the application duration requirements met by the current battery. For example, the preset application duration may include 7.5 years of equivalent application of the battery, 6 years of equivalent application, 3.3 years of equivalent application, 8 years of equivalent application, etc.

[0048] It can be understood that the power spectrum is a table of discharge powers corresponding to various temperatures and states of charge (SOC).

[0049] Step S104, based on the initial internal resistance value and the preset internal resistance growth model, determining the current internal resistance value of the battery cell or battery module under the cycle durability condition and the storage durability condition.

[0050] Among them, the preset internal resistance growth model is used to calculate the precise internal resistance value under the influence of cyclic endurance conditions and storage endurance conditions. It can be understood that the preset internal resistance growth model is obtained through research and simulation by the inventor.

[0051] Step S106, determining the discharge power of the current battery pack according to the power spectrum corresponding to the battery cell or battery module, the current internal resistance value and the initial internal resistance value, wherein the current battery pack is assembled from the battery cells or battery modules.

[0052] In a preferred embodiment of actual application, the initial internal resistance value and power spectrum of the preset application time are first obtained, and then the precise internal resistance value of the battery cells or modules constituting the battery pack is determined through the initial internal resistance value and the preset internal resistance growth model. Then, the discharge power of the battery cells or modules that meet the preset application time requirement is calculated in combination with the initial discharge power in the power spectrum, and then the discharge power of the current battery pack is further determined so that the electric vehicle can control the application based on this discharge power.

[0053] It should be noted that, in order to avoid the calculation error of the corresponding discharge power in the power spectrum, which will affect the safety of the vehicle's motor output, a relatively large safety factor is generally reserved. For example, the actual maximum discharge power of the battery can control the vehicle motor to have an output power of 10KW. However, under the effect of this safety factor, the vehicle motor is often only allowed to output an output power of 8KW, ensuring that the output power is less than the discharge power when there is an error in the battery discharge power, ensuring the battery life, but this method causes a loss in the vehicle's power performance.

[0054] In some embodiments, the discharge power can be used as a control standard for the output power of the entire vehicle to ensure the service life of the battery pack. Exemplarily, the method provided in the above embodiment may further include the following steps:

[0055] Step 1.1), sending the current discharge power of the battery pack to the vehicle motor, and controlling the output power of the vehicle motor based on the discharge power.

[0056] It can be understood that based on the embodiment of the present invention, the accuracy of the internal resistance under different application endurance conditions is taken into consideration to determine the discharge power of the battery pack. The discharge power has high accuracy and can be used to control the output power of the vehicle's motor. While the battery pack is safely used, it ensures that the vehicle has the largest possible output power.

[0057] In some embodiments, a relatively accurate cell internal resistance value is determined by a preset internal resistance growth model. For example, step S104 may include:

[0058] Step 2.1), according to a preset internal resistance growth model, determining the internal resistance increase percentage of the battery cell under the cycle endurance condition and the storage endurance condition respectively.

[0059] Among them, in step 2.1), the percentage increase of the internal resistance of the battery cell can be obtained by the following formula:

[0060] R%=R0%+G calender +G cycle (R%≥1)

[0061]

[0062]

[0063] Among them, R% is the percentage of internal resistance increase, R0% is the initial resistance percentage (the value can be 1), G calender G is the percentage increase of the internal resistance of the battery cell under storage durability conditions. cycle It is the percentage increase of the internal resistance of the battery cell under the cycle endurance condition, Ah is the discharge capacity, T is the temperature, Ea3 and Ea4 are the electrochemical coefficients, C, D, n, Z1 are the test calibration coefficients, Hour is the cumulative storage time of the battery cell under the storage endurance condition, and SOC is the state of charge.

[0064] Step 2.2), based on the internal resistance increase percentage and the initial internal resistance value of the battery cell, determine the current internal resistance value of the battery cell.

[0065] Among them, the more accurate internal resistance value R of the battery cell for the current application time can be determined by the following formula:

[0066] R=R%*R0

[0067] In other embodiments, a relatively accurate internal resistance value of the battery module is determined by a preset internal resistance growth model. For example, step S104 may further include:

[0068] Step 3.1), according to the preset internal resistance growth model and the clamping force correction coefficient, respectively determine the internal resistance increase percentage of the battery module under the cycle endurance condition and the storage endurance condition.

[0069] Among them, in step 3.1), the percentage increase of the internal resistance of the battery module can be obtained by the following formula:

[0070] R%=R0%+G calender +G cycle (R%≥1)

[0071]

[0072]

[0073] Among them, R% is the percentage of internal resistance increase, R0% is the initial resistance percentage (value is 1), G calender G is the percentage increase of the internal resistance of the battery module under storage endurance conditions. cycle It is the percentage increase of internal resistance of the battery module under the cycle endurance condition, Ah is the discharge capacity, T is the temperature, Ea3 and Ea4 are the electrochemical coefficients, C, D, n, Z1 are the test calibration coefficients, Hour is the cumulative storage time of the battery module under the storage endurance condition, SOC is the state of charge, K1 and K2 are the clamping force correction coefficients.

[0074] It should be noted that the inventors have found that the grouping of battery cells also needs to consider the influence of clamping force. Therefore, the clamping force correction coefficients K1 and K2 are determined based on the measurement of the internal resistance growth rate of grouped batteries, i.e., battery modules, at different cumulative discharge capacities.

[0075] Step 3.2), determining the current internal resistance value of the battery module based on the internal resistance increase percentage and the initial internal resistance value of the battery cell.

[0076] Among them, the more accurate internal resistance value R of the battery module for the current application time can be determined by the following formula:

[0077] R=R%*R0

[0078] It should be noted that the embodiment of the present invention fully considers the impact of storage endurance conditions and cycle endurance conditions on the internal resistance of the battery cell or module through the preset internal resistance growth model; the above-mentioned test calibration coefficient can be obtained based on MATLAB simulation by adopting parameters such as the actually measured internal resistance value.

[0079] Furthermore, the preset internal resistance growth model can be understood as an internal resistance fitting curve of the battery cell or module; the curve is fitted according to multiple different cumulative discharge capacities and the internal resistance growth rate measured therefrom, such as Figure 2 As shown, exemplarily, after four times of collecting battery cell data, the curve fitting is realized, wherein each collection of battery cell data includes: obtaining the internal resistance growth rate corresponding to the battery cell at different cumulative discharge capacities; it can be understood that the cumulative discharge capacity can be obtained based on the preset application time, that is, different battery cell or module application times correspond to different cumulative discharge capacities. Based on the fitting curve, the internal resistance values ​​corresponding to the battery cells or modules of various application times can be accurately known.

[0080] In addition, R%, G calender With G cycle It can also be understood as:

[0081] In some embodiments, the discharge power of the battery pack output to the vehicle motor may be determined by the discharge power of the battery cell or module. For example, step S106 of determining the discharge power of the battery pack by the discharge power of the battery cell may include:

[0082] Step 4.1), updating each discharge power in the power spectrum according to the current internal resistance value and the initial internal resistance value, to obtain a current power spectrum corresponding to the current internal resistance value.

[0083] It should be noted that the update coefficient can be determined by the ratio of the initial internal resistance value to the current internal resistance value, and then each discharge power in the power spectrum is updated based on the update coefficient to obtain the updated current power spectrum. Exemplarily, each discharge power in the original power spectrum is multiplied by the update coefficient to obtain the updated discharge power value.

[0084] Step 4.2), determining the discharge power of the battery pack according to the current power spectrum corresponding to the current internal resistance value of the battery cell or the battery module.

[0085] Exemplarily, based on each discharge power in the current power spectrum corresponding to the current internal resistance value of the battery cell, the internal resistance consistency deviation, the system voltage deviation and the application loss, the respective discharge powers corresponding to the battery pack are determined, and the power spectrum of the battery pack is generated.

[0086]

[0087] Among them, P PACK is the discharge power corresponding to the battery pack, P1 is the discharge power of the battery cell, OCV is the open circuit voltage, and the application loss includes the electrical connection loss I 2 R and AFE loss P AFE .

[0088] It should be noted that 0.932 is the consistency deviation of the cell resistance, and the cut-off voltage range is the upper and lower limits of the cut-off voltage to ensure that the cell is in a reasonable discharge range, for example, it can be 2.5-2.6V.

[0089] In some embodiments, illustratively, the battery pack discharge power may also be determined by the battery module discharge power, and step S106 may further include the following steps:

[0090] Step 5.1), based on the target required power of the battery pack, determine the cell assembly type of the battery module.

[0091] Among them, the assembly type of the battery pack needs to be determined based on the discharge capacity of the battery pack and the discharge capacity of each model of battery cells. For example, a single battery cell can meet the discharge requirements of the battery module. The battery module may be composed of only a single battery cell, or the battery module requires three battery cells connected in parallel.

[0092] Step 5.2), according to the battery cell assembly type, determine each discharge power in the current power spectrum corresponding to the current internal resistance value of the battery module, wherein the discharge power of the battery module is the discharge power generated by the battery cell with the smallest discharge power in the battery module.

[0093] It should be noted that each discharge power in the power spectrum corresponding to the battery module is updated based on the discharge power generated by the battery cell with the smallest discharge power in the battery module with the current internal resistance value. Taking a module composed of three cells in parallel as an example, the actual discharge power of the module needs to consider the minimum discharge power among the three cells to avoid over-discharge of the cells and affect the life of the cells.

[0094] Step 5.3), determining each discharge power corresponding to the battery pack according to each discharge power, system voltage deviation and application loss, and generating a power spectrum of the battery pack.

[0095]

[0096] Among them, P PACK is the discharge power corresponding to the battery pack, P2 is the module discharge power, OCV is the open circuit voltage, and the application loss includes the electrical connection loss I 2 R and AFE loss P AFE The cut-off voltage range is the upper and lower limits of the cut-off voltage to ensure that the battery cell is in a reasonable discharge range, for example, it can be 2.5-2.6V.

[0097] The embodiment of the present invention calculates the precise internal resistance value of the battery cell or battery module by storing the internal resistance fitting formula under endurance conditions and cyclic endurance conditions, and determines the discharge power corresponding to the current battery pack on this basis. The output power of the whole vehicle is directly controlled based on the accurate discharge power, which saves the consideration of the safety factor, avoids over-discharge of the battery, and ensures the output power of the whole vehicle.

[0098] like Figure 3 As shown, the embodiment of the present invention further provides a device 200 for determining discharge power, the device comprising:

[0099] An acquisition module 201 is used to acquire an initial internal resistance value of a battery cell or a battery module that meets a preset application duration requirement and a power spectrum corresponding to the initial internal resistance value;

[0100] A first determination module 202 determines a current internal resistance value of the battery cell or the battery module under a cycle durability condition and a storage durability condition based on the initial internal resistance value and a preset internal resistance growth model;

[0101] The second determination module 203 determines the discharge power of the current battery pack according to the power spectrum corresponding to the battery cell or the battery module, the current internal resistance value and the initial internal resistance value, wherein the current battery pack is assembled from the battery cell or the battery module.

[0102] In some embodiments, the first determination module 202 is also specifically used to determine the internal resistance increase percentage of the battery cell under the cycle endurance condition and the storage endurance condition according to a preset internal resistance growth model; and determine the current internal resistance value of the battery cell based on the internal resistance increase percentage and the initial internal resistance value of the battery cell.

[0103] In some embodiments, the first determination module 202 is also specifically used to determine the internal resistance increase percentage of the battery module under cyclic endurance conditions and storage endurance conditions according to a preset internal resistance growth model and a clamping force correction coefficient; and determine the current internal resistance value of the battery module based on the internal resistance increase percentage and the initial internal resistance value of the battery cell.

[0104] In some embodiments, the second determination module 203 is also specifically used to update each discharge power in the power spectrum according to the current internal resistance value and the initial internal resistance value to obtain the current power spectrum corresponding to the current internal resistance value; and determine the discharge power of the battery pack according to the current power spectrum corresponding to the current internal resistance value of the battery cell or the battery module.

[0105] In some embodiments, the second determination module 203 is also specifically used to determine each discharge power corresponding to the battery pack according to each discharge power in the current power spectrum corresponding to the current internal resistance value of the battery cell, the internal resistance consistency deviation, the system voltage deviation and the application loss, and generate the power spectrum of the battery pack.

[0106] In some embodiments, the second determination module 203 is also specifically used to determine the cell assembly type of the battery module based on the target required power for the battery pack; determine each discharge power in the current power spectrum corresponding to the current internal resistance value of the battery module according to the cell assembly type, wherein the discharge power of the battery module is the discharge power generated by the cell with the smallest discharge power in the battery module; determine each discharge power corresponding to the battery pack according to each discharge power, system voltage deviation and application loss, and generate the power spectrum of the battery pack.

[0107] In some embodiments, the device further includes a control module for sending the current discharge power of the battery pack to a vehicle motor and controlling the output power of the vehicle motor based on the discharge power.

[0108] Figure 4 Schematic diagram of the hardware architecture of the electronic device 300 provided in an embodiment of the present invention. Figure 4As shown, the electronic device 300 includes: a machine-readable storage medium 301 and a processor 302, and may also include a non-volatile storage medium 303, a communication interface 304 and a bus 305; wherein the machine-readable storage medium 301, the processor 302, the non-volatile storage medium 303 and the communication interface 304 communicate with each other through the bus 305. The processor 302 can execute the method for determining the discharge power described in the above embodiment by reading and executing the machine-executable instructions for determining the discharge power in the machine-readable storage medium 301.

[0109] The machine-readable storage medium mentioned in this article can be any electronic, magnetic, optical or other physical storage device that can contain or store information, such as executable instructions, data, etc. For example, the machine-readable storage medium can be: RAM (Radom Access Memory), volatile memory, non-volatile memory, flash memory, storage drive (such as hard disk drive), any type of storage disk (such as CD, DVD, etc.), or similar storage medium, or a combination thereof.

[0110] The non-volatile medium may be a non-volatile memory, a flash memory, a storage drive (such as a hard drive), any type of storage disk (such as a CD, DVD, etc.), or a similar non-volatile storage medium, or a combination thereof.

[0111] It can be understood that the specific operation methods of each functional module in this embodiment can refer to the detailed description of the corresponding steps in the above method embodiment, and will not be repeated here.

[0112] The computer-readable storage medium provided in the embodiment of the present invention stores a computer program. When the computer program code is executed, the method for determining the discharge power described in any of the above embodiments can be implemented. For specific implementation, please refer to the method embodiment, which will not be repeated here.

[0113] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0114] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0115] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0116] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the aforementioned embodiments, those of ordinary skill in the art should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the aforementioned embodiments within the technical scope disclosed by the present invention, or can easily conceive of changes, or make equivalent replacements for some of the technical features therein. Such modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the protection scope of the present invention.

Claims

1. A method for determining discharge power, characterized in that: The method comprises: Obtaining an initial internal resistance value of a battery cell or battery module that meets a preset application duration requirement and a power spectrum corresponding to the initial internal resistance value; Based on the initial internal resistance value and a preset internal resistance growth model, determining a current internal resistance value of the battery cell or the battery module under a cycle durability condition and a storage durability condition; Determining the discharge power of a current battery pack according to the power spectrum corresponding to the battery cell or the battery module, the current internal resistance value, and the initial internal resistance value, wherein the current battery pack is assembled from the battery cell or the battery module; The step of determining the current discharge power of the battery pack according to the power spectrum corresponding to the battery cell or the battery module, the current internal resistance value and the initial internal resistance value comprises: According to the current internal resistance value and the initial internal resistance value, each discharge power in the power spectrum is updated to obtain a current power spectrum corresponding to the current internal resistance value; Determining the discharge power of the battery pack according to a current power spectrum corresponding to a current internal resistance value of the battery cell or the battery module; The step of determining the discharge power of the battery pack according to the current power spectrum corresponding to the current internal resistance value of the battery cell or the battery module comprises: According to each discharge power in the current power spectrum corresponding to the current internal resistance value of the battery cell, the internal resistance consistency deviation, the system voltage deviation and the application loss, the respective discharge powers corresponding to the battery pack are determined, and the power spectrum of the battery pack is generated.

2. The method according to claim 1, characterized in that The step of determining the current internal resistance value of the battery cell or the battery module under the cycle durability condition and the storage durability condition based on the initial internal resistance value and the preset internal resistance growth model comprises: According to a preset internal resistance growth model, determining the internal resistance increase percentage of the battery cell under a cycle durability condition and a storage durability condition respectively; Based on the internal resistance increase percentage and the initial internal resistance value of the battery cell, a current internal resistance value of the battery cell is determined.

3. The method according to claim 1, characterized in that The step of determining the current internal resistance value of the battery cell or the battery module under the cycle durability condition and the storage durability condition based on the initial internal resistance value and the preset internal resistance growth model comprises: According to a preset internal resistance growth model and a clamping force correction coefficient, determining the internal resistance increase percentage of the battery module under a cycle durability condition and a storage durability condition respectively; Based on the internal resistance increase percentage and the initial internal resistance value of the battery cell, a current internal resistance value of the battery module is determined.

4. The method according to claim 1, characterized in that The step of determining the discharge power of the battery pack according to the current power spectrum corresponding to the current internal resistance value of the battery cell or the battery module also includes: Determining a cell assembly type of the battery module based on a target required power for the battery pack; Determine, according to the battery cell assembly type, each discharge power in the current power spectrum corresponding to the current internal resistance value of the battery module, wherein the discharge power of the battery module is the discharge power generated by the battery cell with the smallest discharge power in the battery module; According to each of the discharge powers, the system voltage deviation and the application loss, the respective discharge powers corresponding to the battery pack are determined, and a power spectrum of the battery pack is generated.

5. The method according to claim 1, characterized in that The method further comprises: The current discharge power of the battery pack is sent to a vehicle motor, and the output power of the vehicle motor is controlled based on the discharge power.

6. A device for determining discharge power, characterized in that: The device comprises: An acquisition module is used to acquire an initial internal resistance value of a battery cell or a battery module that meets a preset application duration requirement and a power spectrum corresponding to the initial internal resistance value; A first determination module determines a current internal resistance value of the battery cell or the battery module under a cycle durability condition and a storage durability condition based on the initial internal resistance value and a preset internal resistance growth model; a second determination module, determining the discharge power of a current battery pack according to a power spectrum corresponding to the battery cell or the battery module, the current internal resistance value, and the initial internal resistance value, wherein the current battery pack is assembled from the battery cell or the battery module; The second determination module is further used to update each discharge power in the power spectrum according to the current internal resistance value and the initial internal resistance value to obtain a current power spectrum corresponding to the current internal resistance value; and determine the discharge power of the battery pack according to the current power spectrum corresponding to the current internal resistance value of the battery cell or the battery module; The second determination module is also used to determine each discharge power corresponding to the battery pack according to each discharge power in the current power spectrum corresponding to the current internal resistance value of the battery cell, the internal resistance consistency deviation, the system voltage deviation and the application loss, and generate the power spectrum of the battery pack.

7. An electronic device comprising a memory and a processor, wherein the memory stores a computer program that can be run on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 5 are implemented.

8. A machine-readable storage medium, characterized in that: The machine-readable storage medium stores machine-executable instructions, and when the machine-executable instructions are called and executed by a processor, the machine-executable instructions prompt the processor to implement the steps of the method described in any one of claims 1 to 5.

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