Charging strategy determination method, device and equipment

Abstract

The invention provides a charging strategy determination method, device and equipment, and the method comprises the steps: obtaining an initial charging strategy of a to-be-detected battery at a target temperature and a plurality of preset temperatures, and the plurality of preset temperatures are lower than the target temperature; for any first initial charging strategy in the plurality of initial charging strategies, determining a plurality of battery temperatures of the to-be-tested battery in the charging test process of the to-be-tested battery in the formulating process of the first initial charging strategy; according to the first initial charging strategy, charging parameters corresponding to the multiple battery temperatures are determined; and based on the target temperature, determining an actual charging strategy of the to-be-detected battery at the target temperature according to the charging parameters corresponding to the plurality of battery temperatures. The determination accuracy and safety of the battery charging strategy can be improved, and the battery use risk such as lithium precipitation can be reduced.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of energy storage batteries, and in particular to a method, device and equipment for determining a charging strategy. Background Art

[0002] With the popularity of new energy vehicles, fast charging technology for energy storage batteries such as lithium-ion batteries has gradually become a hot research topic. In order to meet complex working conditions, it is necessary to be able to quickly charge energy storage batteries in a large temperature range. Therefore, it is necessary to develop charging strategies at different temperatures.

[0003] At present, when formulating a charging strategy at any target temperature, the battery to be tested is often charged at the target temperature first, and the negative electrode potential of the battery to be tested is monitored. The negative electrode potential is kept above the safety boundary by adjusting the charging current. Finally, the charging strategy at the target temperature is determined based on the above-adjusted charging current. However, due to the existence of the internal resistance of the battery, the battery will produce a certain temperature rise during the above-mentioned charging strategy determination process, resulting in the actual temperature corresponding to the above-mentioned charging strategy being higher than the target temperature, which will result in the formulated charging strategy having a low accuracy, and the battery use risks such as lithium plating are prone to occur in actual use. Summary of the invention

[0004] The present application provides a method, device and equipment for determining a charging strategy, which can improve the accuracy and safety of determining a battery charging strategy and reduce the risks of battery use such as lithium plating.

[0005] In a first aspect, the present application provides a method for determining a charging strategy, the method comprising: obtaining an initial charging strategy for a battery to be tested at a target temperature and multiple preset temperatures, wherein the multiple preset temperatures are all lower than the target temperature; for any first initial charging strategy among the multiple initial charging strategies, determining multiple battery temperatures of the battery to be tested during a charging test of the battery to be tested during the formulation of the first initial charging strategy; determining charging parameters corresponding to each of the multiple battery temperatures according to the first initial charging strategy; and determining an actual charging strategy for the battery to be tested at the target temperature based on the target temperature and the charging parameters corresponding to each of the multiple battery temperatures.

[0006] In a second aspect, the present application provides a device for determining a charging strategy, the device comprising: a strategy acquisition module, used to obtain an initial charging strategy for a battery to be tested at a target temperature and multiple preset temperatures, wherein the multiple preset temperatures are all lower than the target temperature; a temperature determination module, used to determine, for any first initial charging strategy among the multiple initial charging strategies, multiple battery temperatures of the battery to be tested during a charging test of the battery to be tested during the formulation of the first initial charging strategy; a parameter determination module, used to determine, according to the first initial charging strategy, the charging parameters corresponding to each of the multiple battery temperatures; and a strategy formulation module, used to determine, based on the target temperature, the actual charging strategy of the battery to be tested at the target temperature according to the charging parameters corresponding to each of the multiple battery temperatures.

[0007] In a third aspect, the present application provides an electronic device, comprising: a processor and a memory, the memory being used to store a computer program, the processor being used to call and run the computer program stored in the memory, and executing the method in the first aspect or its various implementations.

[0008] In a fourth aspect, the present application provides a computer-readable storage medium for storing a computer program, wherein the computer program enables a computer to execute the method in the first aspect or its various implementations.

[0009] In a fifth aspect, the present application provides a computer program product, comprising computer program instructions, which enable a computer to execute the method in the first aspect or its various implementations.

[0010] In a sixth aspect, the present application provides a computer program, which enables a computer to execute the method in the first aspect or its various implementations.

[0011] Through the technical solution of the present application, it can be understood that, since there is a battery temperature rise when the battery to be tested is charged during the formulation of the initial charging strategies for the target temperature and the preset temperature, and the preset temperature is lower than the target temperature, there is a temperature close to or consistent with the target temperature among the multiple battery temperatures when the battery to be tested is charged during the formulation of the above-mentioned initial charging strategy. Then, according to the multiple battery temperatures corresponding to each initial charging strategy and the charging parameters corresponding to each battery temperature, a more accurate and safer charging strategy at the target temperature, i.e., the actual charging strategy, can be determined, thereby improving the accuracy and safety of determining the battery charging strategy and reducing the risks of battery use such as lithium plating. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for describing the embodiments are briefly introduced below.

[0013] Figure 1A flowchart of a method for determining a charging strategy provided in an embodiment of the present application;

[0014] Figure 2A A schematic diagram of an initial charging strategy provided in an embodiment of the present application;

[0015] Figure 2B A schematic diagram of another initial charging strategy provided in an embodiment of the present application;

[0016] Figure 2C A schematic diagram of another initial charging strategy provided in an embodiment of the present application;

[0017] Figure 2D A schematic diagram of another initial charging strategy provided in an embodiment of the present application;

[0018] Figure 3 A schematic diagram of a method for determining a charging strategy provided in an embodiment of the present application;

[0019] Figure 4 A schematic diagram of another method for determining a charging strategy provided in an embodiment of the present application;

[0020] Figure 5 A schematic diagram of another method for determining a charging strategy provided in an embodiment of the present application;

[0021] Fig. 6A A schematic diagram of a charging strategy at a target temperature provided in an embodiment of the present application;

[0022] Figure 6B A schematic diagram of another charging strategy at a target temperature provided in an embodiment of the present application;

[0023] Figure 7 A schematic diagram of a charging strategy determination device 700 provided in an embodiment of the present application;

[0024] Figure 8 A schematic block diagram of an electronic device 800 provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or server that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0026] It should be understood that the technical solution of the present application can be applied to the following scenarios, but is not limited to:

[0027] In one embodiment, the technical solution of the present application can be applied to the charging strategy determination / formulation scenario of the energy storage battery. For example, it can be applied to the charging strategy determination scenario of the lithium-ion battery at any ambient temperature, and the present application does not impose any restrictions on this.

[0028] After introducing the application scenarios of the embodiments of the present application, the technical solution of the present application will be described in detail below:

[0029] Figure 1 A flow chart of a method for determining a charging strategy provided in an embodiment of the present application, such as Figure 1 As shown, the method may include the following steps:

[0030] S110: Obtaining an initial charging strategy of the battery to be tested at a target temperature and multiple preset temperatures, where the multiple preset temperatures are all lower than the target temperature;

[0031] S120: for any first initial charging strategy among the multiple initial charging strategies, determining multiple battery temperatures of the battery to be tested during a charging test of the battery to be tested during a formulation of the first initial charging strategy;

[0032] S130: Determine charging parameters corresponding to each of a plurality of battery temperatures according to a first initial charging strategy;

[0033] S140: Based on the target temperature, according to the charging parameters corresponding to each of the multiple battery temperatures, determine an actual charging strategy for the battery to be tested at the target temperature.

[0034] It should be noted that the present application does not limit the execution order of S110 and S120, that is, S120 may be executed first and then S110, or S110 may be executed first and then S120.

[0035] In addition, the charging strategies such as the initial charging strategy and the actual charging strategy in the embodiments of the present application refer to the charging parameters of the battery to be tested at a set temperature (specifically corresponding to the target temperature or the preset temperature). For example, the charging parameters may include: the state of charge (SOC, or the charging state) and the charging current or charging rate corresponding to the state of charge (referring to the current value required to charge the battery to be tested to its rated capacity within a specified time).

[0036] Among them, this application will take the charging parameters including the state of charge and the charging current corresponding to the state of charge as an example to introduce the technical solution of this application.

[0037] In one embodiment, the target temperature and multiple preset temperatures lower than the target temperature can be determined first; then the battery to be tested is charged at multiple preset temperatures and target temperatures, that is, a charging test is performed (the charging test process can be understood as: the process of charging the battery to be tested during the initial charging strategy formulation process) to determine the charging strategy of the battery to be tested at multiple preset temperatures and target temperatures, respectively, and obtain the initial charging strategy of the battery to be tested at the target temperature and multiple preset temperatures. Among them, based on the three-electrode battery technology, a three-electrode battery for the battery to be tested can be made, and charged at a set temperature, while monitoring the negative electrode potential of the battery to be tested based on a reference electrode, and adjusting the charging current to keep the negative electrode potential above the safety boundary (for example, maintained above zero millivolts and kept near the lithium precipitation boundary) until the state of charge of the battery to be tested is 100% (this process is a charging test process), and finally, the charging strategy at the corresponding temperature is determined according to the charging current and the corresponding state of charge involved in the above charging test process.

[0038] In the process of determining any first initial charging strategy among the above-mentioned multiple initial charging strategies, that is, in the process of formulating the first initial charging strategy, the battery temperature of the battery to be tested during the charging test can be detected to obtain multiple battery temperatures corresponding to the first initial charging strategy.

[0039] Exemplarily, the battery temperature of the battery to be tested during the charging test can be tested by a temperature measuring instrument, so that multiple battery temperatures can be determined. The temperature measuring instrument can be a temperature sensor or a temperature measuring element, such as a thermocouple, but not limited thereto. Specifically, the thermocouple can be placed at the center of the large surface of the battery to be tested (the center of the largest area in the battery to be tested), and the battery temperature of the battery to be tested can be obtained by the thermocouple.

[0040] For example, the battery to be tested may be a 150Ah square-shell ternary battery, and a thermocouple may be placed on the surface of the square-shell ternary battery.

[0041] In one embodiment, assuming that the target temperature is 40°C, the multiple preset temperatures are 25°C, 30°C, and 32°C, respectively. The initial charging strategies at 25°C, 30°C, 32°C, and 40°C are as follows: Figure 2A , 2B , 2C, and 2D. Taking the initial charging strategy at 25°C as an example, combined with Figure 2A It can be seen that when the battery to be tested is charged, the battery temperature is consistent with the ambient temperature of 25°C. As the charging time increases, the battery temperature gradually rises and reaches a maximum temperature of 42.1°C. After that, the battery temperature gradually decreases, but is still higher than the ambient temperature of 25°C. The initial charging strategy at 25°C can be: charge the battery to be tested to a state of charge of 10% with a charging current of 1A, charge the battery to be tested to a state of charge of 20% with a charging current of 3.1A, ..., charge the battery to be tested to a state of charge of 100% with a charging current of 0.5A.

[0042] Combined with the above examples, it can be understood that in the process of formulating the initial charging strategy, the preset temperature and the target temperature can be understood as the ambient temperature of the environment in which the battery to be tested is located during the formulation process. However, during the charging test, due to the existence of the internal resistance of the battery to be tested, the battery will produce a certain temperature rise, that is, the temperature rise. Therefore, the actual temperature corresponding to the battery to be tested is generally greater than the above ambient temperature, that is, multiple battery temperatures are greater than or equal to the corresponding ambient temperature (preset temperature or target temperature). Therefore, the accuracy of the above multiple initial charging strategies is low, and the present application takes into account the temperature rise during the battery charging process. The actual charging strategy at the target temperature can be determined according to the battery temperature in the initial charging strategy formulation process of the target temperature and the preset temperature lower than the target temperature, and the charging parameters corresponding to the battery temperature in each initial charging strategy. Since the preset temperature is lower than the target temperature, there is a temperature close to or consistent with the target temperature among the multiple battery temperatures. Therefore, the present application can determine a charging strategy at the target temperature that is more accurate and safer, that is, the actual charging strategy, thereby improving the accuracy and safety of the battery charging strategy and reducing the risk of battery use such as lithium plating.

[0043] In one embodiment, when executing S130, the acquisition time of the battery temperature can be determined first, and the charging parameters (specifically, the state of charge and the charging current corresponding to the state of charge) during the charging test at the acquisition time can be determined; then, the charging parameters during the charging test at the acquisition time can be determined as the charging parameters corresponding to the battery temperature. Specifically, the first time of acquiring the battery temperature and the second time corresponding to each specific value (specifically, each state of charge) in the charging parameter can be recorded through the timestamp technology; then, the charging parameters (specifically, the state of charge and the charging current corresponding to the state of charge) at the second time including the first time can be determined as the charging parameters corresponding to the battery temperature.

[0044] For example, assuming that when determining the initial charging strategy at 25°C, a charging test is performed on the battery to be tested in an environment of 25°C, and the battery temperature at time 1 is collected as 30°C. During the charging test, a charging current of 3.1A is required to charge the battery to be tested to a state of charge of 20% at time 1. Then, it can be determined that: the charging parameter corresponding to the battery temperature of 30°C is "charging the battery to be tested to a state of charge of 20% with a charging current of 3.1A".

[0045] The present application will introduce the process of determining the actual charging strategy of the battery to be tested at the target temperature according to multiple battery temperatures and the charging parameters corresponding to the multiple battery temperatures in the following embodiments:

[0046] In one embodiment, a battery temperature that is closer to the target temperature can be determined from multiple battery temperatures corresponding to multiple initial charging strategies according to the target temperature to obtain the target battery temperature, and then the actual charging strategy can be determined according to the charging parameters of the target battery temperature, thereby ensuring that the actual charging strategy is the most accurate charging strategy at the target temperature. The target battery temperature can be determined by the target temperature and the temperature deviation value.

[0047] Specifically, the temperature deviation value can be determined first; then, the difference between the target temperature and the temperature deviation value is calculated to obtain the first boundary temperature; the sum of the target temperature and the temperature deviation value is calculated to obtain the second boundary temperature; then, the battery temperature greater than the first boundary temperature and less than the second boundary temperature among each of the multiple battery temperatures (i.e., the multiple battery temperatures corresponding to each of the multiple initial charging strategies) can be determined as the corresponding multiple target battery temperatures; the actual charging strategy is determined according to the charging parameters corresponding to each of the multiple target battery temperatures; wherein the maximum value among each of the multiple battery temperatures is greater than or equal to the target temperature (to ensure that a battery temperature greater than the first boundary temperature and less than the second boundary temperature can be selected from the multiple battery temperatures).

[0048] For example, it is assumed that the preset temperatures are T1, T2, ..., T s-1, the target temperature is T s , where T1<T2<……<T s ; Preset temperature and target temperature T1, T2, ..., T s In the process of formulating the initial charging strategy under the condition of 1-max , T 2-max ,……,T s-max , and T 1-max <T 2-max <……<T s-max , T 1-max ≥T s Among them, combined Figures 2A-2D It can be seen that the battery temperature first increases and then decreases. Therefore, the determined target battery temperature may include: a first target battery temperature and a second target battery temperature that are equal, the state of charge corresponding to the first target battery temperature is less than or equal to the state of charge corresponding to the highest battery temperature, and the state of charge corresponding to the second target battery temperature is greater than or equal to the state of charge corresponding to the highest battery temperature. Figures 2A-2D , determine the target battery temperature on both sides of the maximum battery temperature. Assuming that the temperature deviation value is δ, for example, it can be 0.5, but not limited to this, then it can be determined that the first boundary temperature and the second boundary temperature are T s-δ , T S+δ , then we can get the maximum battery temperature from both sides of the interval (T s-δ , T S+δ ) is determined as the target battery temperature.

[0049] For example, Figure 3 As shown, for the initial charging strategy under T1, the corresponding target battery temperature is T 1-max (i.e. the maximum battery temperature), the target battery temperature T 1-max The corresponding state of charge is SOC 1m ; For the initial charging strategy under T2, the corresponding target battery temperature includes: T 2-a ,……,T 2-max ,……,T 2-b , where T 2-a =T 2-b , target battery temperature T 2-a , T 2-max , T 2-b The corresponding state of charge is SOC 2-a , SOC 2m , SOC 2-b ; For T s The initial charging strategy under the condition of s-a(i.e. the maximum battery temperature), the target battery temperature T s-a The corresponding state of charge is 0% (since the charging test has just started at this time, the battery temperature has not risen).

[0050] After determining the multiple target battery temperatures corresponding to the multiple initial charging strategies, the multiple battery temperatures may be sorted according to the charge states corresponding to the multiple battery temperatures, thereby determining the actual charging strategy.

[0051] In one embodiment, the charging parameters include: multiple states of charge. Accordingly, determining the actual charging strategy according to the charging parameters corresponding to each of the multiple target battery temperatures may include: sorting the charging parameters corresponding to each of the multiple target battery temperatures according to the order of the states of charge in the charging parameters corresponding to each of the multiple target battery temperatures; and determining the actual charging strategy according to the sorted multiple charging parameters.

[0052] For example, Figure 3 or Figure 4 As shown, the target battery temperatures corresponding to the multiple initial charging strategies can be sorted in ascending order of the state of charge in the charging parameters corresponding to the multiple target battery temperatures in a table or statistical chart; then, the order of the multiple target battery temperatures can be determined as the order of the charging parameters corresponding to the multiple target battery temperatures. For example, Figure 5 As shown, the target battery temperature range is (T s-δ , T S+δ ), charging parameters include state of charge and charging current, with target battery temperature T s For example, the target battery temperature T s The corresponding charging current is IT s , the corresponding state of charge is 0%.

[0053] In addition, as shown in FIG. 6 , the charging parameters (specifically, charging rates) corresponding to the multiple target battery temperatures may be sorted and counted in ascending order of the state of charge.

[0054] It can be understood that when determining the actual charging strategy based on multiple target battery temperatures corresponding to multiple initial charging strategies, some charge states under the actual charging strategy do not have corresponding target battery temperatures under the initial charging strategy. Then there are no corresponding charging parameters under the initial charging strategy that can be included in the actual charging strategy. Therefore, the charging parameters under the charge state can be supplemented to determine a complete actual charging strategy.

[0055] In one embodiment, the actual charging strategy includes: multiple target state of charge intervals and target charging currents corresponding to each of the multiple target state of charge intervals. Accordingly, the above-mentioned determination of the actual charging strategy based on the sorted multiple charging parameters includes: determining multiple target state of charge intervals of the actual charging strategy; determining the state of charge intervals that are not involved in the state of charge in the sorted multiple charging parameters among the multiple target state of charge intervals to obtain a specific target state of charge interval; determining the target charging current corresponding to the specific target state of charge interval according to the specific charging current or the specific charging rate; determining the actual charging strategy according to the target charging current corresponding to the specific target state of charge interval and the sorted multiple charging parameters; wherein the specific charging current or the specific charging rate includes at least one of the following: the charging current or the charging rate corresponding to the specific target state of charge interval in the initial charging strategy of the target temperature, and the charging current or the charging rate corresponding to the adjacent state of charge interval in the sorted multiple charging parameters; the adjacent state of charge interval is: the state of charge interval in the multiple target state of charge intervals that is adjacent to the specific target state of charge interval in the order of the corresponding state of charge. The charging current or charging rate corresponding to the adjacent state of charge intervals is: the charging current or charging rate corresponding to the state of charge included in the adjacent state of charge intervals among the sorted multiple charging parameters.

[0056] Among them, the adjacent state of charge intervals include: a first adjacent state of charge interval and a second adjacent state of charge interval, the state of charge corresponding to the first adjacent state of charge interval is less than the state of charge corresponding to the specific target state of charge interval, and the state of charge corresponding to the second adjacent state of charge interval is greater than the state of charge corresponding to the specific target state of charge interval.

[0057] For example, assuming that the SOC interval is 5%, the multiple target SOC intervals of the actual charging strategy are: [0%, 5%], (5%, 10%], ..., (95%, 100%]. In addition, Fig. 6A As shown, assuming that the charge states of the sorted multiple charging parameters are: 5%, 10%, 40%, 45%, 50%, 75%, 80%, 85%, 90%, 95%, 100%, it can be determined that among the above multiple target charge state intervals, the charge state intervals not involved in the charge state in the sorted multiple charging parameters include: (10%, 35%] and (50%, 70%], that is, the specific target charge state intervals are determined to be (10%, 35%] and (50%, 70%].

[0058] For example, assuming that the specific target state of charge interval is (10%, 35%], the adjacent state of charge intervals may be a first adjacent state of charge interval (5%, 10%] and a second adjacent state of charge interval (35%, 40%]. Fig. 6AAs shown, the charging rate corresponding to the first adjacent state of charge interval (5%, 10%] is 1C.

[0059] In one embodiment, the target charging current corresponding to the specific target state of charge interval may be determined according to the specific charging current or the specific charging rate in any of the following ways, but not limited thereto:

[0060] Method 1: Determine a target charging current corresponding to a specific target state of charge interval according to charging currents corresponding to adjacent state of charge intervals in the sorted plurality of charging parameters.

[0061] Specifically, the target charging current corresponding to the first adjacent state of charge interval can be determined to obtain the first adjacent charging current; the target charging current corresponding to the second adjacent state of charge interval can be determined to obtain the second adjacent charging current; then, the interval size corresponding to the specific target state of charge interval can be determined; finally, based on the interval size, the first adjacent charging current and the second adjacent charging current, the target charging current corresponding to the specific target state of charge interval can be determined.

[0062] Exemplarily, the target charging current corresponding to the specific target state of charge interval can be determined based on the interval size, the first adjacent charging current and the second adjacent charging current based on the linear interpolation method. That is, the charging current between the first adjacent charging current and the second adjacent charging current can be divided into equal intervals according to the interval size of the specific target state of charge interval (the interval size can be determined based on the state of charge interval) to obtain the target charging current corresponding to the specific target state of charge interval.

[0063] For example, Fig. 6A and Figure 6BAs shown in the line corresponding to the safety correction strategy (i.e., the actual charging strategy) in the figure, taking the specific target state of charge interval as (10%, 35%] as an example, the first adjacent state of charge interval (5%, 10%] corresponds to a charging rate of 1C and a charging current of 1A (i.e., the first adjacent charging current is 1A), and the second adjacent state of charge interval (35%, 40%] corresponds to a charging rate of 4C and a charging current of 4A (i.e., the second adjacent charging current is 4A). Assuming that the state of charge interval is 5%, it can be determined that the interval size of the specific target state of charge interval is (35%-10 %) / 5%=5, the charging current between the first adjacent charging current 1A and the second adjacent charging current 4A is equally divided, and the target charging currents corresponding to the specific target state of charge intervals include: 1.5A, 2A, 2.5A, 3A, and 3.5A, wherein the target charging currents 1.5A, 2A, 2.5A, 3A, and 3.5A correspond to (10%, 15%], (15%, 20%], (20%, 25%], (25%, 30%], and (30%, 35%] in the specific target state of charge interval (10%, 35%], respectively.

[0064] Method 2: Determine the target charging current corresponding to the specific target state of charge interval according to the charging current corresponding to the specific target state of charge interval in the initial charging strategy of the target temperature.

[0065] Specifically, the charging current corresponding to the specific target state of charge interval in the initial charging strategy of the target temperature may be directly determined as the target charging current corresponding to the specific target state of charge interval.

[0066] For example, Figure 6B As shown, the temperature rise strategy shown by the dotted line is the initial charging strategy at the target temperature, and the safety correction strategy shown by the solid line is the actual charging strategy at the target temperature. Taking the specific target state of charge interval as [10%, 35%], the charging current corresponding to the state of charge interval [10%, 35%] in the initial charging strategy can be directly determined as the target charging current corresponding to the specific target state of charge interval [10%, 35%] in the actual charging strategy. That is, it can be determined that the target charging current corresponding to the specific target state of charge interval [10%, 35%] includes: 3.6A, 3.8A, 4.0A, 4.2A, and 4.2A, wherein the target charging currents 3.6A, 3.8A, 4.0A, 4.2A, and 4.2A correspond to [10%, 15%], [15%, 20%], [20%, 25%], [25%, 30%], and [30%, 35%] in the specific target state of charge interval [10%, 35%], respectively.

[0067] Method three, determining the target charging current corresponding to the specific target SOC interval according to the charging current corresponding to the specific target SOC interval in the initial charging strategy of the target temperature and the charging current corresponding to the adjacent SOC interval in the sorted multiple charging parameters.

[0068] Specifically, the maximum value, the minimum value or the average value of the target charging currents respectively determined according to the above-mentioned method 1 and method 2 may be determined as the target charging current corresponding to the specific target state of charge interval.

[0069] Exemplarily, in combination with the above-mentioned embodiments, taking the determination of the target charging current corresponding to a specific target state of charge interval according to the minimum value of the target charging currents determined respectively by the above-mentioned method one and method two as an example, it can be determined that the target charging current corresponding to the specific target state of charge interval [10%, 35%] includes: 1.5A, 2A, 2.5A, 3A, 3.5A, wherein the target charging currents 1.5A, 2A, 2.5A, 3A, 3.5A correspond to (10%, 15%], (15%, 20%], (20%, 25%], (25%, 30%], (30%, 35%] in the specific target state of charge interval (10%, 35%] respectively.

[0070] Combination Figure 6B It can be seen from the experimental data shown that the charging strategy determined in the relevant technical scheme, namely the initial charging strategy, corresponds to a higher charging current / charging rate, and is more prone to risks such as lithium plating. The technical scheme of the present application takes into account the battery temperature rise problem when determining the actual charging strategy for the target temperature, and combines the initial charging strategy at a preset temperature lower than the target temperature (charging strategy with temperature rise problems). In addition, since there are certain errors in the data testing and collection process, the simultaneous existence of this error and the temperature deviation value can lead to the mutual cancellation of the two. Therefore, the actual charging strategy determined according to the target battery temperature corresponds to a temperature that is basically the target temperature. Therefore, the present application can determine a more accurate and safer charging strategy at the target temperature, namely the actual charging strategy, thereby improving the accuracy and safety of determining the battery charging strategy and reducing the risks of battery use such as lithium plating.

[0071] It should be noted that all the above technical solutions can be combined in any way to form optional embodiments of the present application, which will not be described one by one here.

[0072] Figure 7 Schematic diagram of a charging strategy determination device 700 provided in an embodiment of the present application. Figure 7 As shown, the charging strategy determination device 700 includes: a strategy acquisition module 710 , a temperature determination module 720 , a parameter determination module 730 , and a strategy formulation module 740 .

[0073] In one embodiment, the strategy acquisition module 710 is used to obtain the initial charging strategy of the battery to be tested at a target temperature and multiple preset temperatures, and the multiple preset temperatures are all lower than the target temperature; the temperature determination module 720 is used to determine, for any first initial charging strategy among the multiple initial charging strategies, multiple battery temperatures of the battery to be tested during the charging test of the battery to be tested during the formulation of the first initial charging strategy; the parameter determination module 730 is used to determine the charging parameters corresponding to each of the multiple battery temperatures according to the first initial charging strategy; the strategy formulation module 740 is used to determine the actual charging strategy of the battery to be tested at the target temperature based on the target temperature and the charging parameters corresponding to each of the multiple battery temperatures.

[0074] In one embodiment, the strategy formulation module 740 is specifically used to: determine a temperature deviation value; calculate the difference between the target temperature and the temperature deviation value to obtain a first boundary temperature; calculate the sum of the target temperature and the temperature deviation value to obtain a second boundary temperature; determine the battery temperature among each of the multiple battery temperatures that is greater than the first boundary temperature and less than the second boundary temperature as the corresponding multiple target battery temperatures; determine the actual charging strategy according to the charging parameters corresponding to each of the multiple target battery temperatures; wherein the maximum value among each of the multiple battery temperatures is greater than or equal to the target temperature.

[0075] In one embodiment, the charging parameters include: multiple charge states; a strategy formulation module 740, which is specifically used to: sort the charging parameters corresponding to each multiple target battery temperature according to the order of the charge states in the charging parameters corresponding to each multiple target battery temperature; and determine the actual charging strategy based on the sorted multiple charging parameters.

[0076] In one embodiment, the charging parameters also include: charging currents corresponding to each of the multiple states of charge; the actual charging strategy includes: multiple target state of charge intervals and target charging currents corresponding to each of the multiple target state of charge intervals; the strategy formulation module 740 is specifically used to: determine multiple target state of charge intervals of the actual charging strategy; determine, among the multiple target state of charge intervals, the state of charge intervals that are not involved in the state of charge in the sorted multiple charging parameters, to obtain a specific target state of charge interval; according to the specific charging current, determine the target charging current corresponding to the specific target state of charge interval; determine the actual charging strategy according to the specific target state of charge interval and the target charging current corresponding to the specific target state of charge interval, and the sorted multiple charging parameters; wherein the specific charging current includes at least one of the following: the charging current corresponding to the specific target state of charge interval in the initial charging strategy of the target temperature, and the charging current corresponding to the adjacent state of charge interval in the sorted multiple charging parameters; the adjacent state of charge interval is: the state of charge interval in the multiple target state of charge intervals that is adjacent to the specific target state of charge interval in the order of the corresponding state of charge.

[0077] In one embodiment, the adjacent state-of-charge intervals include: a first adjacent state-of-charge interval and a second adjacent state-of-charge interval, the state-of-charge corresponding to the first adjacent state-of-charge interval is less than the state-of-charge corresponding to the specific target state-of-charge interval, and the state-of-charge corresponding to the second adjacent state-of-charge interval is greater than the state-of-charge corresponding to the specific target state-of-charge interval;

[0078] The strategy formulation module 740 is specifically used to: determine the target charging current corresponding to the first adjacent state of charge interval to obtain the first adjacent charging current; determine the target charging current corresponding to the second adjacent state of charge interval to obtain the second adjacent charging current; determine the interval size corresponding to the specific target state of charge interval; determine the target charging current corresponding to the specific target state of charge interval based on the interval size, the first adjacent charging current and the second adjacent charging current.

[0079] In one embodiment, the strategy formulation module 740 is specifically used to determine the target charging current corresponding to the specific target state of charge interval based on the linear interpolation method according to the interval size, the first adjacent charging current and the second adjacent charging current.

[0080] It should be understood that the embodiments of the device are similar to the embodiments of the above method, and the contents and effects thereof can refer to the contents and effects of the above method, which will not be described in detail in this application. Figure 7 The device 700 shown can execute the above method embodiments, and the above and other operations and / or functions of each module in the device 700 are respectively for implementing the corresponding processes in the above methods, which will not be repeated here for the sake of brevity.

[0081] The above describes the device 700 of the embodiment of the present application from the perspective of the functional module in conjunction with the accompanying drawings. It should be understood that the functional module can be implemented in hardware form, can be implemented by instructions in software form, and can also be implemented by a combination of hardware and software modules. Specifically, the steps of the method embodiment in the embodiment of the present application can be completed by the hardware integrated logic circuit and / or software form instructions in the processor, and the steps of the method disclosed in the embodiment of the present application can be directly embodied as a hardware decoding processor to perform, or a combination of hardware and software modules in the decoding processor to perform. Optionally, the software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an electrically erasable programmable memory, a register, etc. The storage medium is located in a memory, and the processor reads the information in the memory, and completes the steps in the above method embodiment in conjunction with its hardware.

[0082] Figure 8 A schematic block diagram of an electronic device 800 provided in an embodiment of the present application.

[0083] like Figure 8 As shown, the electronic device 800 may include:

[0084] The memory 810 and the processor 820, the memory 810 is used to store the computer program and transmit the program code to the processor 820. In other words, the processor 820 can call and run the computer program from the memory 810 to implement the method in the embodiment of the present application.

[0085] For example, the processor 820 may be configured to execute the above method embodiments according to instructions in the computer program.

[0086] In some embodiments of the present application, the processor 820 may include but is not limited to:

[0087] General-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, etc.

[0088] In some embodiments of the present application, the memory 810 includes but is not limited to:

[0089] Volatile memory and / or non-volatile memory. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM) or a flash memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link DRAM (SLDRAM) and direct RAM bus random access memory (DR RAM).

[0090] In some embodiments of the present application, the computer program may be divided into one or more modules, which are stored in the memory 810 and executed by the processor 820 to complete the method provided by the present application. The one or more modules may be a series of computer program instruction segments capable of completing specific functions, and the instruction segments are used to describe the execution process of the computer program in the electronic device.

[0091] like Figure 8 As shown, the electronic device may also include:

[0092] The transceiver 830 may be connected to the processor 820 or the memory 810 .

[0093] The processor 820 may control the transceiver 830 to communicate with other devices, specifically, to send information or data to other devices, or to receive information or data sent by other devices. The transceiver 830 may include a transmitter and a receiver. The transceiver 830 may further include an antenna, and the number of antennas may be one or more.

[0094] It should be understood that the various components in the electronic device are connected via a bus system, wherein the bus system includes not only a data bus but also a power bus, a control bus and a status signal bus.

[0095] The present application also provides a computer storage medium on which a computer program is stored, and when the computer program is executed by a computer, the computer can perform the method of the above method embodiment. In other words, the present application embodiment also provides a computer program product containing instructions, and when the instructions are executed by a computer, the computer can perform the method of the above method embodiment.

[0096] When software is used for implementation, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instruction is loaded and executed on a computer, the computer can be made to perform the corresponding flow in each method in the embodiment of the present application in whole or in part, and generate the functions that can be realized by each method in the embodiment of the present application. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instruction can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instruction can be transmitted from a website site, computer, server or data center by wired (such as coaxial cable, optical fiber, digital subscriber line (Digital Subscriber Line, DSL)) or wireless (such as infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server, a data center, etc. that contains one or more available media integrations. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital video disk (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0097] Those skilled in the art will appreciate that the modules and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution.

[0098] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the system embodiments described above are only schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the system, device or module can be electrical, mechanical or other forms.

[0099] The modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules, that is, 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. For example, each functional module in each embodiment of the present application may be integrated into a processing module, or each module may exist physically separately, or two or more modules may be integrated into one module.

Claims

1. A method for determining a charging strategy, characterized in that: include: Obtaining an initial charging strategy for the battery to be tested at a target temperature and multiple preset temperatures, wherein the multiple preset temperatures are all lower than the target temperature; For any first initial charging strategy among the plurality of initial charging strategies, determining a plurality of battery temperatures of the battery to be tested during a charging test of the battery to be tested during a formulation of the first initial charging strategy; Determining charging parameters corresponding to each of the plurality of battery temperatures according to the first initial charging strategy; Based on the target temperature, an actual charging strategy of the battery to be tested at the target temperature is determined according to charging parameters corresponding to each of the multiple battery temperatures.

2. The method according to claim 1, characterized in that The determining, based on the target temperature and according to the charging parameters corresponding to each of the plurality of battery temperatures, an actual charging strategy of the battery to be tested at the target temperature includes: Determine the temperature deviation value; Calculating the difference between the target temperature and the temperature deviation value to obtain a first boundary temperature; Calculating the sum of the target temperature and the temperature deviation value to obtain a second boundary temperature; determining, among the plurality of battery temperatures, a battery temperature that is greater than the first boundary temperature and less than the second boundary temperature as a corresponding plurality of target battery temperatures; Determining the actual charging strategy according to the charging parameters corresponding to each of the multiple target battery temperatures; Wherein, a maximum value among the multiple battery temperatures is greater than or equal to the target temperature.

3. The method according to claim 2, characterized in that The charging parameters include: a plurality of charge states; Accordingly, determining the actual charging strategy according to the charging parameters corresponding to each of the multiple target battery temperatures includes: sorting the charging parameters corresponding to the multiple target battery temperatures according to the order of the states of charge in the charging parameters corresponding to the multiple target battery temperatures; The actual charging strategy is determined according to the sorted multiple charging parameters.

4. The method according to claim 3, characterized in that The charging parameters further include: charging currents corresponding to the multiple states of charge; the actual charging strategy includes: multiple target state of charge intervals and target charging currents corresponding to the multiple target state of charge intervals; Accordingly, determining the actual charging strategy according to the sorted multiple charging parameters includes: Determining a plurality of target state of charge intervals of the actual charging strategy; Determine, among the multiple target state of charge intervals, a state of charge interval that is not involved in the state of charge in the sorted multiple charging parameters, to obtain a specific target state of charge interval; Determining, according to the specific charging current, a target charging current corresponding to the specific target state of charge interval; determining the actual charging strategy according to the specific target state of charge interval, the target charging current corresponding to the specific target state of charge interval, and the sorted multiple charging parameters; The specific charging current includes at least one of the following: the charging current corresponding to the specific target state of charge interval in the initial charging strategy of the target temperature, and the charging current corresponding to the adjacent state of charge interval in the sorted multiple charging parameters; The adjacent state of charge interval is: a state of charge interval adjacent to the specific target state of charge interval in the order of corresponding state of charge among the multiple target state of charge intervals.

5. The method according to claim 4, characterized in that The adjacent state-of-charge intervals include: a first adjacent state-of-charge interval and a second adjacent state-of-charge interval, the state-of-charge corresponding to the first adjacent state-of-charge interval is smaller than the state-of-charge corresponding to the specific target state-of-charge interval, and the state-of-charge corresponding to the second adjacent state-of-charge interval is larger than the state-of-charge corresponding to the specific target state-of-charge interval; Accordingly, determining the target charging current corresponding to the specific target state of charge interval according to the specific charging current includes: Determine a target charging current corresponding to the first adjacent state of charge interval to obtain a first adjacent charging current; Determine a target charging current corresponding to the second adjacent state of charge interval to obtain a second adjacent charging current; Determining an interval size corresponding to the specific target state of charge interval; A target charging current corresponding to the specific target state of charge interval is determined according to the interval size, the first adjacent charging current, and the second adjacent charging current.

6. The method according to claim 5, characterized in that The determining, according to the interval size, the first adjacent charging current, and the second adjacent charging current, a target charging current corresponding to the specific target state of charge interval includes: Based on a linear interpolation method, a target charging current corresponding to the specific target state of charge interval is determined according to the interval size, the first adjacent charging current, and the second adjacent charging current.

7. A device for determining a charging strategy, characterized in that: include: A strategy acquisition module, used to acquire an initial charging strategy of the battery to be tested at a target temperature and multiple preset temperatures, wherein the multiple preset temperatures are all lower than the target temperature; a temperature determination module, configured to determine, for any first initial charging strategy among the plurality of initial charging strategies, a plurality of battery temperatures of the battery to be tested during a charging test of the battery to be tested during a formulation of the first initial charging strategy; a parameter determination module, configured to determine, according to the first initial charging strategy, charging parameters corresponding to each of the plurality of battery temperatures; The strategy formulation module is used to determine the actual charging strategy of the battery to be tested at the target temperature based on the target temperature and according to the charging parameters corresponding to each of the multiple battery temperatures.

8. An electronic device, characterized in that: include: processor; as well as A memory, configured to store executable instructions of the processor; The processor is configured to perform the method of any one of claims 1 to 6 by executing the executable instructions.

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 method according to any one of claims 1 to 6 is implemented.

10. A computer program product comprising instructions, characterized in that When the computer program product is run on an electronic device, the electronic device is enabled to execute the method according to any one of claims 1 to 6.

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