Power battery charging control method and device

Abstract

The present application relates to the field of energy management technology, and provides a charging control method and device for a power battery. The method comprises: determining a corresponding first charging rate from a charging power table according to the current battery temperature and current power data of the power battery; determining that the first charging rate is outside the rate reduction interval, and obtaining a corresponding second charging rate from a thermal balance power table used to maintain the power battery in a thermal balance state according to the current external temperature of the power battery, so as to determine the smaller charging rate between the first charging rate and the second charging rate as a target rate; and controlling the power battery to charge according to the target rate. The charging control method for a power battery provided in an embodiment of the present application can reduce the risk of local overheating of the battery during charging and improve the safety of charging the power battery.

Description

Technical Field

[0001] The present application relates to the field of energy management technology, and specifically to a charging control method and device for a power battery. Background Art

[0002] New energy driving tools, such as new energy vehicles, usually use rechargeable power batteries to provide energy for driving. When charging the power battery, in order to improve the charging efficiency and safety of the charging process, in the related technology, the charging power table reflecting the charging capacity of the power battery cell - charging map is usually queried based on the temperature and voltage of the power battery, or the temperature and battery SOC (State of Charge) of the power battery to determine the charging rate of the power battery, so as to control the charging of the power battery according to the charging rate.

[0003] However, when the charging rate is high, such as above 2C, since the charging rate at this time far exceeds the cold heat exchange power of the power battery fluid, when the power battery is charged according to the charging rate, there is a risk of local overheating of the power battery, affecting the safety of power battery charging. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the related art. To this end, the present application proposes a charging control method for a power battery, which can reduce the risk of local overheating of the battery during charging and improve the safety of power battery charging.

[0005] The present application also proposes a charging control device for a power battery.

[0006] The application also provides an electronic device.

[0007] The present application also proposes a computer-readable storage medium.

[0008] According to the first aspect of the present application, a method for controlling charging of a power battery includes:

[0009] Determine a corresponding first charging rate from a charging power table according to the current battery temperature and current power data of the power battery;

[0010] Determining that the first charging rate is outside the rate decreasing range, and obtaining a corresponding second charging rate from a thermal balance power table for maintaining the power battery in a thermal balance state according to a current external temperature of the power battery, so as to determine a smaller charging rate between the first charging rate and the second charging rate as a target rate;

[0011] The power battery is controlled to be charged according to the target rate.

[0012] By determining a first charging rate corresponding to the current battery temperature and current power data of the power battery from a charging power table, and when it is detected that the first charging rate is outside the rate decrease interval, a second charging rate corresponding to the current external temperature of the power battery is obtained from a thermal balance power table, and the power battery is controlled to be charged according to a smaller charging rate between the first charging rate and the second charging rate. When the power battery has a high-rate charging capability, the temperature of the power battery can be limited to not exceed the temperature limit in the thermal balance state by maintaining the power battery in a thermal balance state at the second charging rate determined by the thermal balance power table, thereby reducing the risk of local overheating of the battery during charging and improving the safety of power battery charging.

[0013] According to an embodiment of the present application, determining that the first charging rate is outside the rate decreasing range includes:

[0014] The first charging rate is not less than the historical charging rate at the last moment, and it is determined that the first charging rate is outside the rate decreasing range;

[0015] The historical charging rate is determined from a charging power table according to the battery temperature of the power battery at the last moment and the power data at the last moment.

[0016] According to one embodiment of the present application, it also includes:

[0017] Performing charging simulation on the power battery according to each preset charging rate, and obtaining each battery temperature corresponding to each preset charging rate;

[0018] Determine that the battery temperature is in thermal equilibrium with any target external temperature among the external temperatures, and record the preset charging rate corresponding to the battery temperature as the second charging rate corresponding to the target external temperature to generate the thermal balance power table.

[0019] According to one embodiment of the present application, it also includes:

[0020] Determine that the first charging rate is within a rate decrease interval, and obtain a corresponding third charging rate from a linear change rate table obtained by linearly interpolating the charging power table according to the current battery temperature and current power data of the power battery, so as to determine a larger charging rate between the first charging rate and the third charging rate as the target rate.

[0021] According to one embodiment of the present application, the linear change rate table is obtained by linearly interpolating each first charging rate in the charging power table that is within the rate decrease interval.

[0022] According to one embodiment of the present application, the external temperature includes at least one of the ambient temperature and the coolant temperature of an electric vehicle carrying the power electric vehicle.

[0023] According to one embodiment of the present application, the power data includes at least one of a battery voltage and a battery SOC.

[0024] According to the second aspect of the present application, a power battery charging control device includes:

[0025] A charging rate determination module, used to determine a corresponding first charging rate from a charging power table according to a current battery temperature and current power data of the power battery;

[0026] a target rate determination module, configured to determine that the first charging rate is outside a rate reduction interval, and to obtain a corresponding second charging rate from a thermal balance power table for maintaining the power battery in a thermal balance state according to a current external temperature of the power battery, so as to determine a smaller charging rate between the first charging rate and the second charging rate as a target rate;

[0027] The battery charging control module is used to control the power battery to charge according to the target rate.

[0028] An electronic device according to an embodiment of the third aspect of the present application includes a processor and a memory storing a computer program, and when the processor executes the computer program, the power battery charging control method described in any of the above embodiments is implemented.

[0029] According to the computer-readable storage medium of the fourth aspect of the present application, a computer program is stored thereon, and when the computer program is executed by a processor, the power battery charging control method described in any of the above embodiments is implemented.

[0030] According to a computer program product of an embodiment of the fifth aspect of the present application, the computer program product includes: when the computer program is executed by a processor, the power battery charging control method as described in any of the above embodiments is implemented.

[0031] The above one or more technical solutions in the embodiments of the present application have at least one of the following technical effects:

[0032] By determining a first charging rate corresponding to the current battery temperature and current power data of the power battery from a charging power table, and when it is detected that the first charging rate is outside the rate decrease interval, a second charging rate corresponding to the current external temperature of the power battery is obtained from a thermal balance power table, and the power battery is controlled to be charged according to a smaller charging rate between the first charging rate and the second charging rate. When the power battery has a high-rate charging capability, the temperature of the power battery can be limited to not exceed the temperature limit in the thermal balance state by maintaining the power battery in a thermal balance state at the second charging rate determined by the thermal balance power table, thereby reducing the risk of local overheating of the battery during charging and improving the safety of power battery charging.

[0033] Furthermore, by comparing the first charging rate with the historical charging rate determined based on the battery temperature of the power battery at the last moment and the power data at the last moment, and when it is determined that the first charging rate is not less than the historical charging rate, it is determined that the first charging rate is outside the rate decrease range. Therefore, it is possible to quickly determine whether the first charging rate is in the rate decrease range based on the first charging rate and the historical charging rate at the last moment, thereby improving the efficiency of determining the range in which the first charging rate is located.

[0034] Furthermore, the power battery is charged by means of various preset charging rates, and based on the matching results between the battery temperatures obtained after the simulation and the preset external temperatures, a second charging rate corresponding to the external temperature is determined from the preset charging rates to generate a thermal balance power table. Thus, with the help of virtual experiments of charging performance simulation, the actual test amount and resources required are greatly saved, and the rate boundaries under different external temperatures can be accurately determined.

[0035] Furthermore, after determining that the first charging rate is within the rate decrease interval, based on the current battery temperature and current power data of the power battery, a corresponding third charging rate is obtained from the linear change rate table obtained by linearly interpolating the charging power table, so that the larger charging rate between the first charging rate and the third charging rate is determined as the target rate, so that when the first charging rate is within the rate decrease interval, a better charging rate can be obtained for charging, thereby improving the charging efficiency, especially the charging efficiency at the end of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the present application or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 It is a flow chart of a charging control method of a power battery provided in an embodiment of the present application;

[0038] Figure 2 is a schematic diagram of the generation process of the thermal balance power table in an embodiment of the present application;

[0039] Figure 3 is a flow chart of a method for controlling charging of a power battery provided in another embodiment of the present application;

[0040] Figure 4 It is a schematic diagram of the geometric relationship between the value range of the charging power table and the value range of the linear change rate table in the embodiment of the present application;

[0041] Figure 5 It is a structural schematic diagram of a charging control device for a power battery provided in an embodiment of the present application;

[0042] Figure 6 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0044] The following will introduce and explain in detail the power battery charging control method and device provided in the embodiments of the present application through several specific embodiments.

[0045] In one embodiment, a method for controlling charging of a power battery is provided, which is applied to a controller for controlling charging of the power battery. The controller may be a control device such as a single-chip microcomputer, a control chip or a server, and the server may be an independent server or a server cluster composed of multiple servers, or a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, CDN, and big data and artificial intelligence sampling point devices.

[0046] like Figure 1 As shown, a charging control method for a power battery provided in this embodiment includes:

[0047] Step 101, determining a corresponding first charging rate from a charging power table according to the current battery temperature and current power data of the power battery;

[0048] Step 102, determining that the first charging rate is outside the rate decreasing range, and obtaining a corresponding second charging rate from a thermal balance power table for maintaining the power battery in a thermal balance state according to the current external temperature of the power battery, so as to determine a smaller charging rate between the first charging rate and the second charging rate as a target charging rate;

[0049] Step 103: Control the power battery to charge according to the target rate.

[0050] By determining a first charging rate corresponding to the current battery temperature and current power data of the power battery from a charging power table, and when it is detected that the first charging rate is outside the rate decrease interval, a second charging rate corresponding to the current external temperature of the power battery is obtained from a thermal balance power table, and the power battery is controlled to be charged according to a smaller charging rate between the first charging rate and the second charging rate. When the power battery has a high-rate charging capability, the temperature of the power battery can be limited to not exceed the temperature limit in the thermal balance state by maintaining the power battery in a thermal balance state at the second charging rate determined by the thermal balance power table, thereby reducing the risk of local overheating of the battery during charging and improving the safety of power battery charging.

[0051] At the same time, since the temperature of the power battery is limited not to exceed the temperature limit under the thermal equilibrium state, the battery temperature will not be too high, so there will be no need to frequently reduce the battery charging rate due to excessive battery temperature, which will not cause continuous jump oscillations of the charging current, thereby improving the battery charging stability and charging efficiency.

[0052] In one embodiment, the charging power table Map_1 indicates the charging capacity of the battery cell provided by the battery cell supplier of the power battery according to the test, which is the basic condition for control optimization. It records the first charging rate corresponding to the battery temperature and power data of the power battery. The power data includes at least one of the battery SOC and the battery voltage. Exemplarily, the charging power table Map_1 can be shown in the following table:

[0053]

[0054] Among them, the charging power table Map_1 can be obtained through a large number of simulation charging test experiments. The temperature in the charging power table is the battery temperature of the power battery. The SOC in the charging power table is the battery SOC of the power battery, SOC1<SOC2<SOC3<SOC4<SOC5<SOC6<SOC7. The OCV in the charging power table is the battery voltage of the power battery, OCV1<OCV2<OCV3<OCV4<OCV5<OCV6<OCV7.

[0055] After the server obtains the current battery temperature and current power data of the power battery, such as the current battery temperature of the power battery obtained through the temperature sensor, the current battery voltage of the power battery obtained through the voltage detector, or the current battery SOC of the power battery obtained through the SOC chip, it searches the charging power table Map_1 for the first charging rate corresponding to the current battery temperature and current power data. For example, if the current battery temperature is 25 degrees and the current power data is SOC1 or OCV1, the corresponding first charging rate can be determined from the charging power table Map_1 as 3C.

[0056] Alternatively, the first charging rate closest to the current battery temperature and current power data can be found in the charging power table Map_1 according to the current battery temperature and current power data, as the first charging rate corresponding to the current battery temperature and current power data. For example, if the current battery temperature is 24 degrees, the temperature closest to the current battery temperature in the charging power table Map_1 is 25 degrees, and the SOC or OCV closest to the current power data in the charging power table Map_1 is SOC3 or OCV3, then the corresponding first charging rate can be determined from the charging power table Map_1 as 3C.

[0057] As can be seen from the above table, when the battery temperature does not exceed 15 degrees, the charging rate in the charging power table increases with the increase of the battery SOC or battery voltage before SOC3 or OCV3, and after SOC3 or OCV3, that is, starting from SOC4 or OCV4, the charging rate in the charging power table decreases with the increase of the battery SOC or battery voltage. It can be seen that when the battery temperature does not exceed 15 degrees and the power data of the power battery is less than or equal to SOC3 or OCV3, the charging rate does not show a downward trend. At this time, it can be determined that the interval of the charging rate corresponding to the battery temperature not exceeding 15 degrees and the power data of the power battery is less than or equal to SOC3 or OCV3 is a non-rate reduction interval; and when the battery temperature does not exceed 15 degrees and the power data of the power battery is greater than SOC3 or OCV3, the charging rate shows a downward trend. At this time, it can be determined that the interval of the charging rate corresponding to the battery temperature not exceeding 15 degrees and the power data of the power battery is greater than SOC3 or OCV3 is a rate reduction interval. Similarly, the interval of each charging rate in the charging power table Map_1 can be determined.

[0058] After determining the interval of each charging rate in the charging power table Map_1, when the first charging rate is obtained from the charging power table Map_1, it can be determined whether the value corresponding to the first charging rate is in the rate reduction interval. If the value corresponding to the first charging rate is in the rate reduction interval, it is determined that the first charging rate is in the rate reduction interval; otherwise, it is determined that the first charging rate is outside the rate reduction interval.

[0059] Considering that the method of determining whether the first charging rate is in the rate reduction interval by querying the charging power table Map_1 requires traversing all the charging rates in the charging power table Map_1, if the number of charging rates recorded in the charging power table Map_1 is too large, it will affect the efficiency of determining the interval in which the first charging rate is located. Therefore, in order to improve the efficiency of determining the interval in which the first charging rate is located, in addition to the method of determining whether the first charging rate is in the rate reduction interval by querying the charging power table Map_1, in one embodiment, determining that the first charging rate is in the rate reduction interval includes:

[0060] The first charging rate is not less than the historical charging rate at the last moment, and it is determined that the first charging rate is outside the rate decreasing range;

[0061] The historical charging rate is determined from a charging power table according to the battery temperature of the power battery at the last moment and the power data at the last moment.

[0062] In one embodiment, after obtaining the first charging rate from the charging power table Map_1, the first charging rate can be compared with the historical charging rate obtained from the charging power table Map_1 according to the battery temperature of the power battery at the last moment and the power data at the last moment. If the first charging rate is less than the historical charging rate, it means that the current charging rate of the power battery has decreased, and it can be determined that the first charging rate is within the rate decrease range. If the first charging rate is equal to or greater than the historical charging rate, it means that the current charging rate of the power battery has increased, and it can be determined that the first charging rate is outside the rate decrease range.

[0063] By comparing the first charging rate with the historical charging rate determined based on the battery temperature of the power battery at the last moment and the power data at the last moment, and when it is determined that the first charging rate is not less than the historical charging rate, it is determined that the first charging rate is outside the rate decrease range. In this way, it is possible to quickly determine whether the first charging rate is in the rate decrease range based on the first charging rate and the historical charging rate at the last moment, thereby improving the efficiency of determining the range in which the first charging rate is located.

[0064] When it is determined that the first charging rate is outside the rate decrease range, it means that the power battery has a high-rate charging capability. At this time, according to the current external temperature of the power battery, the second charging rate corresponding to the current external temperature is found from the thermal balance power table that records the mapping relationship between each external temperature and each charging rate.

[0065] In one embodiment, the thermal equilibrium state of a power battery refers to that the battery temperature of the power battery is uniform everywhere and equal to the external temperature of the power battery. The external temperature includes the ambient temperature of the environment in which the power battery is located and the coolant temperature of the coolant of the electric vehicle equipped with the power battery. Since the battery temperature generated by the battery is different at different charging rates, it is possible to first determine the target thermal equilibrium temperature of the power battery, that is, determine the external temperature of the power battery, and then set different preset charging rates after determining the external temperature. Then, according to the battery temperature obtained at different preset charging rates, determine the preset charging rate corresponding to the external temperature, thereby forming a thermal balance power table for maintaining the power battery in a thermal equilibrium state. Specifically, in one embodiment, if Figure 2 As shown, the generation of the thermal balance power table includes:

[0066] Step 201, performing charging simulation on the power battery according to each preset charging rate, and obtaining each battery temperature corresponding to each preset charging rate;

[0067] Step 202, determining whether the battery temperature is in thermal equilibrium with any target external temperature among the external temperatures, and recording the preset charging rate corresponding to the battery temperature as the second charging rate corresponding to the target external temperature to generate the thermal balance power table.

[0068] In one embodiment, multiple preset charging rates can be pre-set, and then for a certain preset charging rate, the power battery is charged according to the preset charging rate to simulate the battery temperature corresponding to the preset charging rate. After obtaining the battery temperature corresponding to the preset charging rate, the battery temperature is matched with multiple preset external temperatures to determine whether there is a target external temperature in thermal equilibrium with the battery temperature among the multiple external temperatures. If there is a target external temperature in thermal equilibrium with the battery temperature among the external temperatures, the preset charging rate corresponding to the battery temperature is recorded as the second charging rate corresponding to the target external temperature; otherwise, the preset charging rate is deleted. Thus, after completing the simulation of all preset charging rates, each second charging rate corresponding to each external temperature can be determined, and then according to the mapping relationship between each external temperature and each second charging rate, a thermal balance power table can be generated.

[0069] The power battery is charged at each preset charging rate and simulated, and the second charging rate corresponding to the external temperature is determined from each preset charging rate based on the matching result between each battery temperature obtained after the simulation and each preset external temperature, so as to generate a thermal balance power table. Thus, with the help of the virtual test of charging performance simulation, the actual required test amount and resources are greatly saved, and the rate boundary under different external temperatures can be accurately determined.

[0070] After generating the thermal balance power table, when it is determined that the first charging rate is outside the rate reduction range, the second charging rate corresponding to the current external temperature of the power battery, such as the ambient temperature and the coolant temperature, can be obtained from the thermal balance power table, so that when the power battery is charged at the second charging rate, the battery temperature generated can be in a thermal equilibrium state with the current external temperature.

[0071] After obtaining the second charging rate, the first charging rate is compared with the second charging rate. If the first charging rate is less than the second charging rate, it means that the current charging capacity of the power battery cells will not cause the battery temperature to be too high and affect the thermal balance. At this time, the first charging rate is determined as the target rate. If the first charging rate is equal to the second charging rate, it also means that the current charging capacity of the power battery cells will not cause the battery temperature to be too high and affect the thermal balance. At this time, the first charging rate or the second charging rate can be determined as the target rate. If the first charging rate is greater than the second charging rate, it means that the current charging capacity of the power battery cells will cause the battery temperature to be too high and affect the thermal balance. At this time, the second charging rate is determined as the target rate to avoid the first charging rate being too high and affecting the thermal balance of the power battery, causing local overheating of the power battery.

[0072] At the same time, since the battery temperature is controllable through the above method, the power battery will not need to frequently reduce the charging rate due to excessively high battery temperature, thereby improving the charging efficiency of the power battery.

[0073] In one embodiment, if it is determined that the first charging rate is in the rate reduction interval, the first charging rate can be directly determined as the target rate. However, considering the characteristics of the charging power table Map_1, when the first charging rate is in the rate reduction interval, it is often quite different from the historical charging rate at the previous moment. That is, the charging power table Map_1 is usually in a step jump mode, which results in that when the first charging rate is in the rate reduction interval, if the first charging rate is used for charging, the charging efficiency of the power battery will be significantly reduced. To improve the charging efficiency, in one embodiment, if Figure 3 As shown, it also includes:

[0074] Step 103, determine that the first charging rate is within a rate decrease interval, and obtain a corresponding third charging rate from a linear change rate table obtained by linearly interpolating the charging power table according to the current battery temperature and current power data of the power battery, so as to determine the larger charging rate between the first charging rate and the third charging rate as the target rate.

[0075] In one embodiment, after obtaining the charging power table, the charging power table may be pre-interpolated using a linear interpolation method to obtain a linear change rate table. In order to make the obtained linear change rate table more accurate, the linear interpolation method may be obtained by linearly interpolating each first charging rate in the rate reduction interval in the charging power table. Specifically, each first charging rate in the rate reduction interval of the charging power table is used as each different point in the rate reduction interval, and then the interpolated function f(x) corresponding to the charging power table is determined according to each different point, and then the interpolation function of the interpolated function f(x) is determined by linear interpolation. Therefore, the interpolation nodes corresponding to the battery temperatures and the power data in the rate reduction interval can be determined, so that a linear change rate table is formed according to the battery temperatures, the power data and the corresponding interpolation nodes.

[0076] For example, Figure 4 As shown in the figure, assuming that the rate reduction interval is the rate reduction interval [0.1C, 2C] of the battery temperature 20 degrees and the power data SOC4-SOC7 in the charging power table Map_1, the interpolated function f(x) can be determined according to each first charging rate in the rate reduction interval in a two-dimensional coordinate system with the power data as the horizontal axis and the first charging rate as the vertical axis. At the same time, the interpolation function f(x) can be determined according to the rate reduction interval [0.1C, 2C]. At this time, through the interpolation function The third charging rates corresponding to SOC4-SOC7 respectively can be determined.

[0077] After determining the third charging rate corresponding to each battery temperature and each power data in the rate reduction interval by linear interpolation, a linear change rate table can be generated according to the battery temperature and power data of the power battery and the corresponding third charging rate.

[0078] After generating the linear change rate table, if it is determined that the first charging rate is within the rate reduction interval, a third charging rate corresponding to the current battery temperature and current power data of the power battery is obtained from the linear change rate table according to the current battery temperature and current power data of the power battery.

[0079] After obtaining the third charging rate, the first charging rate is compared with the third charging rate. If the first charging rate is less than the third charging rate, it means that the jump amplitude of the current power battery's cell charging capacity is large and the charging efficiency is low. At this time, the third charging rate can be determined as the target rate to improve the charging efficiency. If the first charging rate is greater than or equal to the third charging rate, it means that the jump amplitude of the current power battery's cell charging capacity is low. At this time, the first charging rate can be determined as the target rate.

[0080] After determining that the first charging rate is within the rate decrease interval, based on the current battery temperature and current power data of the power battery, a corresponding third charging rate is obtained from the linear change rate table obtained by linearly interpolating the charging power table, so as to determine the larger charging rate between the first charging rate and the third charging rate as the target rate, so that when the first charging rate is within the rate decrease interval, a better charging rate can be obtained for charging, thereby improving the charging efficiency, especially the charging efficiency at the end of the power battery.

[0081] After determining the target rate, the controller can control the power battery to charge according to the target rate, thereby improving the battery temperature and improving the charging efficiency of the power battery.

[0082] The charging control device of the power battery provided in the present application is described below. The charging control device of the power battery described below and the charging control method of the power battery described above can be referred to each other.

[0083] In one embodiment, if Figure 5 As shown, a charging control device for a power battery is provided, comprising:

[0084] A charging rate determination module 210, configured to determine a corresponding first charging rate from a charging power table according to a current battery temperature and current power data of the power battery;

[0085] a target rate determination module 220, configured to determine that the first charging rate is outside the rate decreasing range, and to obtain a corresponding second charging rate from a thermal balance power table for maintaining the power battery in a thermal balance state according to the current external temperature of the power battery, so as to determine a smaller charging rate between the first charging rate and the second charging rate as a target rate;

[0086] The battery charging control module 230 is used to control the power battery to be charged according to the target rate.

[0087] By determining a first charging rate corresponding to the current battery temperature and current power data of the power battery from a charging power table, and when it is detected that the first charging rate is outside the rate decrease interval, a second charging rate corresponding to the current external temperature of the power battery is obtained from a thermal balance power table, and the power battery is controlled to be charged according to a smaller charging rate between the first charging rate and the second charging rate. When the power battery has a high-rate charging capability, the temperature of the power battery can be limited to not exceed the temperature limit in the thermal balance state by maintaining the power battery in a thermal balance state at the second charging rate determined by the thermal balance power table, thereby reducing the risk of local overheating of the battery during charging and improving the safety of power battery charging.

[0088] In one embodiment, the target magnification determination module 220 is specifically used to:

[0089] The first charging rate is not less than the historical charging rate at the last moment, and it is determined that the first charging rate is outside the rate decreasing range;

[0090] The historical charging rate is determined from a charging power table according to the battery temperature of the power battery at the last moment and the power data at the last moment.

[0091] In one embodiment, the target magnification determination module 220 is further configured to:

[0092] Performing charging simulation on the power battery according to each preset charging rate, and obtaining each battery temperature corresponding to each preset charging rate;

[0093] Determine that the battery temperature is in thermal equilibrium with any target external temperature among the external temperatures, and record the preset charging rate corresponding to the battery temperature as the second charging rate corresponding to the target external temperature to generate the thermal balance power table.

[0094] In one embodiment, the target magnification determination module 220 is further configured to:

[0095] Determine that the first charging rate is within a rate decrease interval, and obtain a corresponding third charging rate from a linear change rate table obtained by linearly interpolating the charging power table according to the current battery temperature and current power data of the power battery, so as to determine a larger charging rate between the first charging rate and the third charging rate as the target rate.

[0096] In one embodiment, the linear change rate table is obtained by linearly interpolating each first charging rate in the charging power table that is within the rate decrease interval.

[0097] In one embodiment, the external temperature includes at least one of the ambient temperature and the coolant temperature of an electric vehicle carrying the electric vehicle.

[0098] In one embodiment, the power data includes at least one of a battery voltage and a battery SOC.

[0099] Figure 6 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 6 As shown, the electronic device may include: a processor 810, a communication interface 820, a memory 830 and a communication bus 840, wherein the processor 810, the communication interface 820 and the memory 830 communicate with each other through the communication bus 840. The processor 810 may call a computer program in the memory 830 to execute a charging control method for a power battery, for example, including:

[0100] Determine a corresponding first charging rate from a charging power table according to the current battery temperature and current power data of the power battery;

[0101] Determining that the first charging rate is outside the rate decreasing range, and obtaining a corresponding second charging rate from a thermal balance power table for maintaining the power battery in a thermal balance state according to a current external temperature of the power battery, so as to determine a smaller charging rate between the first charging rate and the second charging rate as a target rate;

[0102] The power battery is controlled to be charged according to the target rate.

[0103] In addition, the logic instructions in the above-mentioned memory 830 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art, and the computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0104] On the other hand, an embodiment of the present application further provides a storage medium, the storage medium includes a computer program, the computer program can be stored in a non-transitory computer-readable storage medium, when the computer program is executed by a processor, the computer can execute the power battery charging control method provided in the above embodiments, for example, including:

[0105] Determine a corresponding first charging rate from a charging power table according to the current battery temperature and current power data of the power battery;

[0106] Determining that the first charging rate is outside the rate decreasing range, and obtaining a corresponding second charging rate from a thermal balance power table for maintaining the power battery in a thermal balance state according to a current external temperature of the power battery, so as to determine a smaller charging rate between the first charging rate and the second charging rate as a target rate;

[0107] The power battery is controlled to be charged according to the target rate.

[0108] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, i.e., they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative effort.

[0109] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications 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 application.

Claims

1. A charging control method for a power battery, characterized in that: include: Determine a corresponding first charging rate from a charging power table according to the current battery temperature and current power data of the power battery; Determining that the first charging rate is outside the rate decreasing range, and obtaining a corresponding second charging rate from a thermal balance power table for maintaining the power battery in a thermal balance state according to a current external temperature of the power battery, so as to determine a smaller charging rate between the first charging rate and the second charging rate as a target rate; Determining that the first charging rate is within a rate decreasing interval, and obtaining a corresponding third charging rate from a linearly changing rate table obtained by linearly interpolating the charging power table according to the current battery temperature and current power data of the power battery, so as to determine a larger charging rate between the first charging rate and the third charging rate as the target rate; Controlling the power battery to charge according to the target rate; Among them, the linear interpolation is to use the first charging rates of the charging power table in the rate decrease interval as the different points in the rate decrease interval, determine the interpolated function corresponding to the charging power table according to the different points, and determine the interpolation nodes corresponding to the battery temperatures and the power data in the rate decrease interval through the interpolation function of the interpolated function determined by linear interpolation, so as to form the linear change rate table according to the battery temperatures, the power data and the corresponding interpolation nodes.

2. The power battery charging control method according to claim 1, characterized in that: Determining that the first charging rate is outside a rate decreasing range includes: The first charging rate is not less than the historical charging rate at the last moment, and it is determined that the first charging rate is outside the rate decreasing range; The historical charging rate is determined from a charging power table according to the battery temperature of the power battery at the last moment and the power data at the last moment.

3. The power battery charging control method according to claim 1, characterized in that: Also includes: Performing charging simulation on the power battery according to each preset charging rate, and obtaining each battery temperature corresponding to each preset charging rate; Determine that the battery temperature is in thermal equilibrium with any target external temperature among the external temperatures, and record the preset charging rate corresponding to the battery temperature as the second charging rate corresponding to the target external temperature to generate the thermal balance power table.

4. The power battery charging control method according to claim 1, characterized in that: The linear change rate table is obtained by linearly interpolating each first charging rate in the charging power table that is within the rate reduction interval.

5. The power battery charging control method according to any one of claims 1 to 4, characterized in that: The external temperature includes at least one of the ambient temperature and the coolant temperature of the electric vehicle equipped with the power battery.

6. The power battery charging control method according to any one of claims 1 to 4, characterized in that: The power data includes at least one of a battery voltage and a battery SOC.

7. A charging control device for a power battery, characterized in that: include: A charging rate determination module, used to determine a corresponding first charging rate from a charging power table according to a current battery temperature and current power data of the power battery; a target rate determination module, configured to determine that the first charging rate is outside the rate reduction interval, obtain a corresponding second charging rate from a thermal balance power table used to maintain the power battery in a thermal balance state according to the current external temperature of the power battery, so as to determine the smaller charging rate between the first charging rate and the second charging rate as the target rate, determine that the first charging rate is within the rate reduction interval, obtain a corresponding third charging rate from a linear change rate table obtained by linearly interpolating the charging power table according to the current battery temperature and current power data of the power battery, so as to determine the larger charging rate between the first charging rate and the third charging rate as the target rate; A battery charging control module, used to control the power battery to charge according to the target rate; Among them, the linear interpolation is to use the first charging rates of the charging power table in the rate decrease interval as the different points in the rate decrease interval, determine the interpolated function corresponding to the charging power table according to the different points, and determine the interpolation nodes corresponding to the battery temperatures and the power data in the rate decrease interval through the interpolation function of the interpolated function determined by linear interpolation, so as to form the linear change rate table according to the battery temperatures, the power data and the corresponding interpolation nodes.

8. An electronic device comprising a processor and a memory storing a computer program, characterized in that: When the processor executes the computer program, the power battery charging control method according to any one of claims 1 to 6 is implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the charging control method of the power battery according to any one of claims 1 to 6 is implemented.

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