Charging method and device, charging management equipment and computer readable storage medium

Abstract

The invention is suitable for the technical field of charging, and provides a charging method and device, charging management equipment and a computer readable storage medium, and the method comprises the steps: obtaining the temperature of a to-be-charged battery; acquiring activation energy data of the to-be-charged battery; determining a charging cut-off voltage according to the temperature and the activation energy data; and charging the to-be-charged battery, and controlling the maximum charging voltage of the to-be-charged battery to be less than or equal to the charging cut-off voltage. Through the method, the accuracy of the determined charging cut-off voltage can be improved, the cruising ability of the battery is improved, and the good experience of a user is improved.

Description

Technical Field

[0001] The present application belongs to the field of charging technology, and in particular, relates to a charging method, a device, a charging management device, and a computer-readable storage medium. Background Art

[0002] With the development of society, there are more and more types of new energy equipment. During the use of new energy equipment, it is necessary to charge the power battery of the new energy equipment, and during the charging process, it is usually necessary to refer to the charging cut-off voltage of the power battery to reduce damage to the power battery performance.

[0003] In the existing method, the charging cut-off voltage is set to correspond to the temperature, that is, the charging cut-off voltage set at different temperatures is usually different. However, after charging the battery with the charging cut-off voltage determined in the above manner, the performance of the battery still cannot meet the needs of users. Summary of the invention

[0004] The embodiments of the present application provide a charging method, an apparatus, a charging management device, and a computer-readable storage medium, which can solve the problem that the accuracy of the charging cut-off voltage determined by the existing method is low, which in turn leads to a poor user experience when charging according to the charging cut-off voltage.

[0005] In a first aspect, an embodiment of the present application provides a charging method, comprising:

[0006] Get the temperature of the battery to be charged;

[0007] Obtain activation energy data of the battery to be charged;

[0008] Determining a charge cut-off voltage according to the temperature and the activation energy data;

[0009] The battery to be charged is charged, and the maximum charging voltage of the battery to be charged is controlled to be less than or equal to the charging cut-off voltage.

[0010] In the embodiment of the present application, since the temperature and activation energy data of the battery to be charged will affect whether the activity of the active material of the battery to be charged is fully exerted, and whether the activity of the active material is fully exerted will affect the gram capacity of the active material, therefore, a more accurate charging cut-off voltage can be determined according to the temperature and activation energy data of the battery to be charged, so that after the battery to be charged is charged according to the charging cut-off voltage, the gram capacity of the active material of the charged battery can be further exerted, that is, the energy density of the charged battery is higher, thereby improving the battery life and improving the user experience.

[0011] In a possible implementation of the first aspect, obtaining activation energy data of the battery to be charged includes:

[0012] Determine the battery system where the battery to be charged is located;

[0013] The activation energy data of the battery to be charged is determined according to the battery system.

[0014] In a possible implementation manner of the first aspect, determining the charge cut-off voltage according to the temperature and the activation energy data includes:

[0015] Determining a platform voltage according to the temperature and the activation energy data;

[0016] The charging cut-off voltage of the battery to be charged is determined according to the platform voltage.

[0017] In a possible implementation manner of the first aspect, determining the charging cut-off voltage of the battery to be charged according to the platform voltage includes:

[0018] The charging cut-off voltage of the battery to be charged is determined according to the platform voltage and a preset voltage value, wherein the charging cut-off voltage is greater than the platform voltage.

[0019] In a possible implementation of the first aspect, determining the charging cut-off voltage of the battery to be charged according to the platform voltage and a preset voltage value includes:

[0020] The sum of the platform voltage and a preset voltage value is calculated, and the calculated sum is used as the charging cut-off voltage of the battery to be charged.

[0021] In a possible implementation manner of the first aspect, the preset voltage value is greater than or equal to 0.01 mV and less than or equal to 1000 mV.

[0022] In a possible implementation manner of the first aspect, the preset voltage value is determined according to a target corresponding relationship, and the target corresponding relationship is: a corresponding relationship between a gram capacity of an active material of the battery to be charged and a voltage value after the voltage value exceeds the platform voltage.

[0023] In a possible implementation of the first aspect, in the target correspondence, the target ratio is greater than or equal to 0.3 and less than or equal to 0.7, wherein the target ratio is the ratio between the maximum voltage value exceeding the platform voltage and the gram capacity exceeding the target gram capacity, and the target gram capacity is the gram capacity corresponding to the platform voltage.

[0024] In a second aspect, an embodiment of the present application provides a charging device, including:

[0025] A temperature acquisition module, used to acquire the temperature of the battery to be charged;

[0026] An activation energy data acquisition module, used to acquire activation energy data of the battery to be charged;

[0027] A charging cut-off voltage determination module, used to determine the charging cut-off voltage according to the temperature and the activation energy data;

[0028] The charging module is used to charge the battery to be charged and control the maximum charging voltage of the battery to be charged to be less than or equal to the charging cut-off voltage.

[0029] In a third aspect, an embodiment of the present application provides a charging management device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method described in the first aspect when executing the computer program.

[0030] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method described in the first aspect is implemented.

[0031] In a fifth aspect, an embodiment of the present application provides a computer program product. When the computer program product runs on a charging management device, the charging management device executes any one of the methods described in the first aspect above. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0033] Figure 1 It is a flowchart of a charging method provided by an embodiment of the present application;

[0034] Figure 2 is a schematic diagram of a voltage platform provided in an embodiment of the present application;

[0035] Figure 3 It is a schematic diagram of curve segments corresponding to a voltage platform and a voltage value greater than the platform voltage provided by an embodiment of the present application;

[0036] Figure 4 It is a schematic diagram of another voltage platform and curve segments corresponding to voltage values ​​greater than the platform voltage provided by an embodiment of the present application;

[0037] Figure 5 is a structural schematic diagram of a charging device provided in another embodiment of the present application;

[0038] Figure 6 It is a structural diagram of a charging management device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0039] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0040] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0041] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0042] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. appearing in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways.

[0043] With the development of society, power batteries are being used more and more widely. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as in military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0044] Power batteries (hereinafter referred to as batteries) can be charged multiple times during use to achieve recycling. Specifically, batteries use chemical reactions between active materials at their positive and negative electrodes (such as lithium iron phosphate, lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, etc.) to store and release electrical energy. When the battery is charged, the greater the gram capacity of its active material, the greater the energy density of the battery, that is, the longer the battery's endurance.

[0045] Whether the activity (or gram capacity) of the active material of the battery can be fully utilized is related to the charging voltage: usually, when the charging voltage is less than a certain value, the same active material can release more capacity at a higher charging voltage (that is, the better the activity of the active material), and after the charging voltage is greater than this value, even if the charging voltage continues to increase, the gram capacity of the active material is limited. Considering that the better the gram capacity of the active material of the battery is (that is, the more capacity the active material releases), the longer the battery life energy, and at the same time, considering that the higher the charging voltage, the greater the side effects on the battery (such as making the battery temperature too high), which in turn affects the stability of the battery, therefore, during the charging process, a charging cut-off voltage is usually set, and the maximum charging voltage is limited to not exceed the charging cut-off voltage. That is, whether the charging cut-off voltage is set accurately will affect the battery life after charging and the user experience.

[0046] The purpose of setting the charge cut-off voltage is to ensure the stability of the battery and improve the activity of the active materials of the battery during the charging process. Whether the activity of the active materials of the battery can be fully exerted is not only related to the temperature, but also to the activation energy data of the active materials. The activation energy data is independent of temperature, that is, the activation energy data corresponding to the same active material at different temperatures are the same. Therefore, if the charge cut-off voltage is set only according to the temperature, the accuracy of the obtained charge cut-off voltage is often low.

[0047] In order to improve the accuracy of the determined charging cut-off voltage and improve the stability and endurance of the battery, an embodiment of the present application provides a charging method. In the charging method, the charging cut-off voltage of the battery to be charged is first determined according to the temperature of the battery to be charged and the activation energy data (i.e., the value corresponding to the activation energy), and then the battery to be charged is charged, and the maximum charging voltage of the battery to be charged is controlled to be less than or equal to the charging cut-off voltage.

[0048] The charging method provided in the embodiment of the present application is described below with reference to the accompanying drawings.

[0049] Figure 1 A schematic diagram of a charging method provided in an embodiment of the present application is shown, and is described in detail as follows:

[0050] S11, obtaining the temperature of the battery to be charged.

[0051] The battery to be charged refers to a battery ready for charging. For example, when the new energy vehicle receives an instruction to charge battery A, battery A is the battery to be charged in the embodiment of the present application. Specifically, the temperature of the battery to be charged can be obtained by detecting the battery to be charged through a temperature sensor.

[0052] In some embodiments, when the number of cells in the battery to be charged is equal to 1, the temperature of the battery to be charged can be set to the temperature of the cell. When the number of cells in the battery to be charged is greater than 1, in order to reflect the overall trend of the temperatures of all cells, the temperature of the battery to be charged can be set to the average of the temperatures of all cells. Of course, in order to reduce the cost of obtaining the temperature, the temperature of the battery to be charged can be set to the average of the temperatures of some cells, or the temperature of the battery to be charged can be set to the temperature of a certain cell of the battery to be charged, that is, the temperature of the certain cell is used as the temperature of the battery to be charged, which is not limited here.

[0053] S12, obtaining activation energy data of the battery to be charged.

[0054] The activation energy refers to the energy required for the molecules of the active material to change from a normal state to an active state that is prone to chemical reactions. The activation energy data is the value corresponding to the activation energy. For the same active material in the battery to be charged, the corresponding activation energy data at different temperatures are the same.

[0055] In the embodiment of the present application, the activation energy data of the battery to be charged may be recorded in advance, or data corresponding to the activation energy data may be recorded in advance, and when the activation energy data needs to be obtained, the corresponding activation energy data may be extracted from the record, or after extracting the data corresponding to the activation energy data from the record, the activation energy data may be calculated based on the data and the corresponding relationship. Of course, when the activation energy data needs to be obtained, the activation energy data of the battery to be charged may be determined based on the active material of the battery to be charged itself, which is not limited here.

[0056] Optionally, the activation energy data may be calculated in the following manner: testing the charging curve of the battery to be charged at different temperatures, determining the platform voltage of the battery to be charged at at least two temperatures according to the charging curve, and then calculating the activation energy data of the battery to be charged according to the at least two platform voltages and the corresponding temperatures. For example, assuming that the activation energy data is calculated in combination with the Arrhenius formula:

[0057] Assume that the exponential Arrhenius formula is k = Ae Ea / RT. Wherein, k is the chemical reaction rate constant of the active material, A is the pre-exponential factor (also called frequency factor), and both k and A are related to the platform voltage (such as A is related to the platform voltage at room temperature, and k is related to the platform voltage at other temperatures), R is the molar gas constant, T is the thermodynamic temperature, and Ea is the apparent activation energy (i.e., the activation energy data of the active material). Since at least two platform voltages are predetermined, k and A can be determined based on the relationship between the predetermined platform voltage, k and A. According to the above-mentioned Arrhenius formula, when k, A, R and T are all determined, the activation energy data of the active material can be calculated. After calculating the activation energy data of the active material, the activation energy data can be recorded in the charging system, and when the battery to be charged needs to be charged, the recorded activation energy data can be obtained from the charging system.

[0058] In the embodiment of the present application, the platform voltage refers to a voltage value on a voltage platform, and the voltage platform is a curve segment where the charging voltage is relatively stable in the charging curve of the battery to be charged, that is, within the voltage platform, the gram capacity of the active material of the battery to be charged is greater and the voltage value changes less, and the platform voltage of the voltage value within the voltage platform generally refers to: the voltage value with the smallest voltage change and the larger gram capacity change of the active material of the battery to be tested. Among them, the gram capacity of the active material refers to the ratio of the capacity that the active material can release to the mass of the active material, that is, the gram capacity and activation energy data are parameters that describe the characteristics of the active material from two different dimensions. It should be pointed out that when the active material exerts greater activity, the value corresponding to the gram capacity that the active material can exert is the largest, or close to the maximum value.

[0059] like Figure 2 As shown, there is a flat curve segment (similar to a platform) on the curve corresponding to the voltage value and the gram capacity of the active material. The platform is the voltage platform described in the embodiment of the present application. The voltage value corresponding to point X in the voltage platform can be used as the platform voltage described in the embodiment of the present application. Optionally, the median of the voltage values ​​in the voltage platform can be taken as the platform voltage, or the minimum voltage value of the voltage platform can be taken as the platform voltage, which is not limited here. It should be noted that in Figure 2 In the figure, the line segment corresponding to the voltage platform is a straight line segment, that is, the corresponding voltage values ​​in the voltage platform are all equal. However, in actual situations, the line segment corresponding to the voltage platform is likely to be just a relatively flat curve segment, that is, in the voltage platform, the corresponding voltage values ​​are not completely equal.

[0060] S13, determining the charging cut-off voltage of the battery to be charged according to the temperature and the activation energy data.

[0061] The charge cut-off voltage is also called the charge termination voltage, which refers to the voltage (or voltage value) when the battery reaches a fully charged state during the specified charging period. If charging continues after reaching the charge cut-off voltage, it is considered overcharging, which usually damages the performance and life of the battery.

[0062] In the embodiment of the present application, considering that whether the activity of the active material of the battery to be charged can be fully exerted is related to the temperature and the activation energy data of the active material, therefore, when the charging cut-off voltage is determined by the temperature and the activation energy data, the accuracy of the determined charging cut-off voltage can be improved.

[0063] In some embodiments, a charge cutoff voltage mapping table may be pre-set, in which the charge cutoff voltage corresponding to different temperatures and activation energy data is recorded. After obtaining the temperature and activation energy data of the battery to be charged, the corresponding charge cutoff voltage may be found from the charge cutoff voltage mapping table.

[0064] S14, charging the battery to be charged, and controlling the maximum charging voltage of the battery to be charged to be less than or equal to the above charging cut-off voltage.

[0065] Specifically, according to actual needs, a corresponding charging method can be selected for the rechargeable battery, such as constant current charging or constant voltage charging. When the maximum voltage of the rechargeable battery reaches the charging cut-off voltage of the rechargeable battery, charging of the rechargeable battery is usually stopped to reduce damage to battery performance.

[0066] In the embodiment of the present application, since the temperature and activation energy data of the battery to be charged will affect whether the activity of the active material of the battery to be charged is fully exerted, and whether the activity of the active material is fully exerted will affect the gram capacity of the active material, therefore, a more accurate charging cut-off voltage can be determined according to the temperature and activation energy data of the battery to be charged, so that after the battery to be charged is charged according to the charging cut-off voltage, the gram capacity of the active material of the charged battery can be further exerted, that is, the energy density of the charged battery is higher, thereby improving the battery life and improving the user experience.

[0067] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0068] In some embodiments, in order to reduce the frequency of the temperature sensor acquiring the temperature, the above S11 may acquire the temperature of the battery to be charged in the following manner:

[0069] After receiving the instruction to charge the battery to be charged, the temperature sensor is controlled to obtain the temperature of the battery to be charged. Since the temperature of the battery to be charged is obtained after receiving the instruction to charge the battery to be charged, the frequency of temperature acquisition is reduced, which is beneficial to improving the service life of the temperature sensor. At the same time, when the temperature is obtained in the above manner, it can be guaranteed that the latest temperature is obtained, that is, the accuracy of the obtained temperature is guaranteed.

[0070] In some embodiments, in order to obtain more accurate activation energy data, the above S12 includes:

[0071] A1. Determine the battery system where the battery to be charged is located.

[0072] A2. Determine the activation energy data of the above-mentioned battery to be charged based on the above-mentioned battery system.

[0073] Specifically, considering that different battery systems use different active materials (for example, in different battery systems, the positive and / or negative electrodes of the batteries use different active materials), or different battery systems use different combinations of active materials, and the activation energies corresponding to different active materials are usually different (in this case, the activation energy data of one of the active materials is usually selected as the activation energy data corresponding to the battery system), the battery system where the battery to be charged is located can be determined first, and the activation energy data corresponding to the battery system where the battery to be charged is located can be determined based on the correspondence between the battery system and the activation energy data. Alternatively, after determining the battery system where the battery to be charged is located, the active material corresponding to the battery system where the battery to be charged is located can be determined based on the correspondence between the battery system and the active material, and then the activation energy data corresponding to the active material can be determined based on the correspondence between the active material and the activation energy. That is, since there is a certain correspondence between the battery system and the active material, and the active material also has a certain correspondence with the activation energy data, determining the activation energy data of the battery to be charged in the above manner can improve the accuracy of the determined activation energy data.

[0074] In some embodiments, in order to further improve the accuracy of the determined charging cut-off voltage, the above S13 includes:

[0075] B1. Determine the platform voltage based on the above temperature and activation energy data.

[0076] The platform voltage refers to the voltage value corresponding to the minimum voltage change and the large change in gram capacity. For example, the voltage value corresponding to the voltage change less than the first preset threshold and the change in gram capacity of the active material greater than the second preset threshold is taken as the platform voltage of the embodiment of the present application. The first preset threshold is usually less than the second preset threshold, and the first preset threshold is close to 0.

[0077] In the embodiment of the present application, considering that the corresponding relationship between the platform voltage, temperature and activation energy data that affect the full exertion of the activity of the active material obeys the Arrhenius formula, therefore, the platform voltage corresponding to the full exertion of the activity of the active material of the battery to be charged at the current temperature can be calculated based on the obtained temperature of the battery to be charged and the activation energy data of the battery to be charged.

[0078] Specifically, assuming that the exponential Arrhenius formula is k = Ae Ea / RT , A is related to the platform voltage at room temperature (such as 25°), and k is related to the platform voltage at other temperatures. Since A can be determined in advance, such as after determining the platform voltage at room temperature according to the charging curve, A is determined according to the relationship between the platform voltage and A. Therefore, according to the determined R, T, Ea, and A, k can be determined, that is, k related to the platform voltage at the current temperature is determined, and then combined with the predetermined correspondence between k and the platform voltage, the platform voltage corresponding to the current temperature can be determined.

[0079] In some embodiments, a platform voltage mapping relationship may also be predetermined, and the platform voltage mapping relationship is used to record the corresponding relationship between temperature, activation energy data, and platform voltage. After obtaining the temperature and activation energy data of the battery to be charged, the corresponding platform voltage is determined according to the platform voltage mapping relationship. Of course, the platform voltage may also be determined by other methods, which will not be described here.

[0080] B2. Determine the charging cut-off voltage of the battery to be charged according to the platform voltage.

[0081] Specifically, the corresponding charge cut-off voltage is determined with reference to the platform voltage. For example, the platform voltage is used as the charge cut-off voltage, or a voltage value greater than the platform voltage is used as the charge cut-off voltage.

[0082] Since the activity of the active materials of the battery to be charged can be fully exerted under the platform voltage, and when the activity of the active materials is fully exerted, the energy density of the battery can be increased, that is, the endurance of the battery to be charged can be increased, therefore, when the embodiment of the present application determines the charging cut-off voltage with reference to the platform voltage, the accuracy of the determined charging cut-off voltage can be improved.

[0083] In some embodiments, the above B2 includes:

[0084] The charging cut-off voltage of the battery to be charged is determined according to the platform voltage and a preset voltage value, wherein the charging cut-off voltage is greater than the platform voltage.

[0085] In the embodiment of the present application, since the activity of the active materials of the battery can usually be fully exerted after the charging voltage reaches the platform voltage, setting the charging cut-off voltage greater than the voltage value corresponding to the platform voltage can ensure that when the battery is charged, its maximum charging voltage can be at the voltage value corresponding to the platform voltage, that is, it is ensured that the activity of the active materials of the battery to be charged can be fully exerted, thereby improving the battery life of the battery to be charged.

[0086] In some embodiments, the above-mentioned charging cut-off voltage may be determined by adding or multiplying the voltage value corresponding to the platform voltage and the preset voltage value, and it is only necessary to ensure that the obtained charging cut-off voltage is greater than the platform voltage.

[0087] In some embodiments, when the charging cut-off voltage is determined by adding the voltage value corresponding to the platform voltage to the preset voltage value, the preset voltage value is set to be greater than 0. That is, when the charging cut-off voltage of the battery to be charged is determined according to the platform voltage and the preset voltage value, it includes:

[0088] The sum of the platform voltage and the preset voltage value is calculated, and the calculated sum is used as the charging cut-off voltage of the battery to be charged.

[0089] For example, assuming that the temperature T is 25°C, the voltage value corresponding to the determined platform voltage is V 常温 , the preset voltage value is V 0 , then the determined charging cut-off voltage V=V 常温 +V 0 .

[0090] When the temperature T is less than the normal temperature, the platform voltage is determined to be V 低温 , the preset voltage value is V 0 ', then the determined charging cut-off voltage V = V 低温 +V 0 ′.

[0091] When the temperature T> normal temperature, the determined platform voltage is V 高温 , the preset voltage value is V 0 ″, then the determined charging cut-off voltage V=V 高温 +V 0 ″.

[0092] Among them, the above V 0 、V 0 ′、V 0 "" can be equal values ​​or unequal values, which is not limited here.

[0093] In the embodiment of the present application, since the sum of the platform voltage and a preset voltage value greater than 0 is used as the charging cut-off voltage, it can be ensured that the voltage of the battery to be charged is greater than the platform voltage, thereby ensuring that the activity of the active material of the battery to be charged can be fully exerted after the battery to be charged.

[0094] In some embodiments, if the sum of the platform voltage and the preset voltage value is used as the charge cut-off voltage, the preset voltage value is greater than or equal to 0.01 mV and less than or equal to 1000 mV.

[0095] For example, when the platform voltage is added to 0.01mV or 1000mV respectively, since 0.01mV or 1000mV are both greater than 0, any sum obtained will be greater than the platform voltage. That is, when the preset voltage value is greater than or equal to 0.01mV and less than or equal to 1000mV, after the platform voltage is added to the preset voltage value, the sum obtained can be used as the charging cut-off voltage of the battery to be charged.

[0096] Taking into account that the activity of the active materials of the battery can be fully exerted after the voltage value is greater than the platform voltage, the increased voltage value (i.e., the preset voltage value) is set greater than or equal to 0.01mV. At the same time, taking into account that the voltage value that the battery itself can reach is limited, the increased voltage value is set less than or equal to 1000mV to ensure that the charging cut-off voltage determined according to the above method is more accurate.

[0097] Of course, if the product of the platform voltage and the preset voltage value is used as the charge cut-off voltage, the preset voltage value needs to be greater than 1mv to ensure that the charge cut-off voltage is greater than the platform voltage, which will not be elaborated here.

[0098] In some embodiments, the preset voltage value is between [50 mV, 200 mV].

[0099] In the embodiment of the present application, considering that the preset voltage value is between [50mV, 200mV], the voltage value increased by the charging cut-off voltage is not large, that is, the voltage value that the charging voltage can increase is not large, and because the gram capacity of the active material generally continues to increase with the increase of the charging voltage, therefore, when the charging cut-off voltage is determined by the above method, it is possible to avoid causing excessive damage to the battery to be charged while improving the energy density of the battery to be charged, thereby effectively improving the endurance of the battery to be charged and ensuring the service life of the battery to be charged.

[0100] In some embodiments, the preset voltage value is determined according to a target correspondence relationship, and the target correspondence relationship is: the correspondence between the gram capacity of the active material of the battery to be charged and the voltage value after the voltage value exceeds the platform voltage.

[0101] Specifically, considering that the gram capacity of the active material can be fully exerted when the voltage of the battery is a platform voltage, and the preset voltage value is used to ensure that the determined charging cut-off voltage is at least greater than the platform voltage, the preset voltage value can be determined in combination with the corresponding relationship between the voltage value exceeding the platform voltage and the gram capacity.

[0102] like Figure 3 As shown, it is assumed that the curve segment corresponding to Q1 is the curve segment corresponding to the voltage platform, and Q2 is greater than the platform voltage (i.e. Figure 3 The curve segment corresponding to the voltage value of X in the figure. The corresponding relationship between the gram capacity and the voltage value of the active material of the battery to be charged is different at Q1 and Q2. Figure 3 It can be seen that when the voltage value exceeds the platform voltage, even if the voltage value continues to increase, the increase in the gram capacity of the active material is very limited, and the active material usually has a large side reaction under high voltage (such as aggravating the oxidation reaction of the electrode), that is, the battery will reduce its service life under high voltage. Therefore, determining the preset voltage value based on the corresponding relationship between the gram capacity of the active material and the voltage value in Q2 can improve the accuracy of the determined preset voltage value.

[0103] In some embodiments, in order to ensure that the activity of the active material is fully exerted and reduce damage to the battery, the preset voltage value can be set to a smaller value when the trend of Q2 is steeper (i.e., the slope of the curve is larger), and the preset voltage value can be set to a larger value when the trend of Q2 is flatter (i.e., the slope of the curve is smaller). Specifically, N points (N is greater than or equal to 2) can be selected in Q2, and the ratio between the voltage value exceeding the platform voltage and the gram capacity of the active material exceeding the target gram capacity (the target gram capacity is the gram capacity of the active material corresponding to the above platform voltage) in the N points can be determined respectively. If the ratio corresponding to the voltage value closest to the platform voltage (i.e., the voltage value corresponding to the first point selected from left to right in Q2) is within the preset ratio range, the preset voltage value can be determined based on the voltage value closest to the platform voltage, or the relationship between the ratio corresponding to the next point and the preset ratio range can be determined, until a point that is not within the preset ratio range is determined. Figure 4 As shown, assuming that the platform voltage is W0, the gram capacity of the active material corresponding to the platform voltage is S0, the first point selected from left to right in Q2 is M, the voltage value corresponding to M is W1, and the gram capacity of the active material corresponding to M is S1, then it is determined The relationship between the preset ratio range and the Within the preset ratio range, (W1-W0) is used as the preset voltage value described in the embodiment of the present application.

[0104] In some embodiments, in the above target correspondence, the target ratio is greater than or equal to 0.3 and less than or equal to 0.7, wherein the target ratio is the ratio between the voltage value exceeding the platform voltage and the gram capacity exceeding the target gram capacity, and the above target gram capacity is the gram capacity of the active material corresponding to the above platform voltage.

[0105] In the embodiment of the present application, considering that when the ratio is between [0.3, 0.7], the gram capacity of the active material and the increase in the voltage value are still within an acceptable range, that is, as the voltage value increases, the energy density of the battery also continues to increase. Therefore, a point with a ratio between [0.3, 0.7] can be selected on Q2, and a preset voltage value can be determined based on the voltage value of the selected point to ensure the battery life while improving the battery life.

[0106] Corresponding to the charging method described in the above embodiment, Figure 5 A structural block diagram of a charging device provided in an embodiment of the present application is shown. For ease of explanation, only the parts related to the embodiment of the present application are shown.

[0107] Reference Figure 5 , the charging device 5 comprises:

[0108] The temperature acquisition module 51 is used to acquire the temperature of the battery to be charged.

[0109] In some embodiments, when the number of cells in the battery to be charged is equal to 1, the temperature of the battery to be charged can be set to the temperature of the cell. When the number of cells in the battery to be charged is greater than 1, in order to reflect the overall trend of the temperatures of all cells, the temperature of the battery to be charged can be set to the average of the temperatures of all cells. Of course, in order to reduce the cost of obtaining the temperature, the temperature of the battery to be charged can be set to the average of the temperatures of some cells, or the temperature of the battery to be charged can be set to the temperature of a certain cell of the battery to be charged, that is, the temperature of the certain cell is used as the temperature of the battery to be charged.

[0110] The activation energy data acquisition module 52 is used to acquire the activation energy data of the battery to be charged.

[0111] The charging cut-off voltage determination module 53 is used to determine the charging cut-off voltage according to the temperature and the activation energy data.

[0112] The charging module 54 is used to charge the battery to be charged and control the maximum charging voltage of the battery to be charged to be less than or equal to the charging cut-off voltage.

[0113] In the embodiment of the present application, since the temperature and activation energy data of the battery to be charged will affect whether the activity of the active material of the battery to be charged is fully exerted, and whether the activity of the active material is fully exerted will affect the gram capacity of the active material, therefore, a more accurate charging cut-off voltage can be determined according to the temperature and activation energy data of the battery to be charged, so that after the battery to be charged is charged according to the charging cut-off voltage, the gram capacity of the active material of the charged battery can be further exerted, that is, the energy density of the charged battery is higher, thereby improving the battery life and improving the user experience.

[0114] In some embodiments, the activation energy data acquisition module 52 includes:

[0115] The battery system determination unit is used to determine the battery system in which the battery to be charged is located.

[0116] The activation energy data determining unit is used to determine the activation energy data of the battery to be charged according to the battery system.

[0117] In some embodiments, the charging cut-off voltage determination module 53 includes:

[0118] The platform voltage determination unit is used to determine the platform voltage according to the temperature and the activation energy data.

[0119] The charging cut-off voltage determining unit is used to determine the charging cut-off voltage of the battery to be charged according to the platform voltage.

[0120] In some embodiments, the charging cut-off voltage determination unit is specifically used to:

[0121] The charging cut-off voltage of the battery to be charged is determined according to the platform voltage and a preset voltage value, wherein the charging cut-off voltage is greater than the platform voltage.

[0122] In some embodiments, determining the charging cut-off voltage of the battery to be charged according to the platform voltage and a preset voltage value includes:

[0123] The sum of the platform voltage and the preset voltage value is calculated, and the calculated sum is used as the charging cut-off voltage of the battery to be charged.

[0124] In some embodiments, the preset voltage value is greater than or equal to 0.01 mV and less than or equal to 1000 mV.

[0125] In some embodiments, the preset voltage value is determined according to a target correspondence relationship, and the target correspondence relationship is: the correspondence between the gram capacity of the active material of the battery to be charged and the voltage value after the voltage value exceeds the platform voltage.

[0126] In some embodiments, in the above-mentioned target correspondence, the target ratio is greater than or equal to 0.3 and less than or equal to 0.7, wherein the above-mentioned target ratio is the ratio between the voltage value exceeding the above-mentioned platform voltage and the gram capacity exceeding the target gram capacity, and the above-mentioned target gram capacity is the gram capacity corresponding to the above-mentioned platform voltage.

[0127] It should be noted that the information interaction, execution process, etc. between the above-mentioned devices / units are based on the same concept as the method embodiment of the present application. Their specific functions and technical effects can be found in the method embodiment part and will not be repeated here.

[0128] Figure 6 This is a schematic diagram of the structure of a charging management device provided in one embodiment of the present application. Figure 6 As shown, the charging management device 6 of this embodiment includes: at least one processor 60 ( Figure 6 Only one processor is shown in the figure), a memory 61, and a computer program 62 stored in the memory 61 and executable on the at least one processor 60, wherein the processor 60 implements the steps of any of the above-mentioned method embodiments when executing the computer program 62.

[0129] The charging management device 6 may include, but is not limited to, a processor 60 and a memory 61. Those skilled in the art will appreciate that Figure 6 This is only an example of the charging management device 6 and does not constitute a limitation on the charging management device 6. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, it may also include input and output devices, network access devices, etc.

[0130] The processor 60 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0131] In some embodiments, the memory 61 may be an internal storage unit of the charging management device 6, such as a hard disk or memory of the charging management device 6. In other embodiments, the memory 61 may also be an external storage device of the charging management device 6, such as a plug-in hard disk, a smart memory card (SmartMedia Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the charging management device 6. Further, the memory 61 may also include both an internal storage unit and an external storage device of the charging management device 6. The memory 61 is used to store an operating system, an application program, a boot loader (BootLoader), data, and other programs, such as the program code of the computer program. The memory 61 may also be used to temporarily store data that has been output or is to be output.

[0132] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0133] An embodiment of the present application also provides a network device, which includes: at least one processor, a memory, and a computer program stored in the memory and executable on the at least one processor, wherein the processor implements the steps in any of the above-mentioned method embodiments when executing the computer program.

[0134] An embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps in the above-mentioned method embodiments can be implemented.

[0135] An embodiment of the present application provides a computer program product. When the computer program product runs on a charging management device, the charging management device can implement the steps in the above-mentioned various method embodiments when executing the computer program product.

[0136] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the process in the above-mentioned embodiment method, which can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may at least include: any entity or device that can carry the computer program code to the camera / charging management device, recording medium, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, RandomAccess Memory), electric carrier signal, telecommunication signal and software distribution medium. For example, USB flash drive, mobile hard disk, disk or optical disk. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electric carrier signals and telecommunication signals.

[0137] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0138] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0139] In the embodiments provided in the present application, it should be understood that the disclosed devices / network equipment and methods can be implemented in other ways. For example, the device / network equipment embodiments described above are merely schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units 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, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0140] 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, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0141] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such 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, and should all be included in the protection scope of the present application.

Claims

1. A charging method, characterized in that: include: Get the temperature of the battery to be charged; Obtain activation energy data of the battery to be charged; Determining a charge cut-off voltage according to the temperature and the activation energy data; The battery to be charged is charged, and the maximum charging voltage of the battery to be charged is controlled to be less than or equal to the charging cut-off voltage.

2. The charging method according to claim 1, characterized in that: The step of obtaining activation energy data of the battery to be charged includes: Determine the battery system where the battery to be charged is located; The activation energy data of the battery to be charged is determined according to the battery system.

3. The charging method according to claim 1 or 2, characterized in that: The step of determining the charge cut-off voltage according to the temperature and the activation energy data comprises: Determining a platform voltage according to the temperature and the activation energy data; The charging cut-off voltage of the battery to be charged is determined according to the platform voltage.

4. The charging method according to claim 3, characterized in that: The step of determining the charging cut-off voltage of the battery to be charged according to the platform voltage comprises: The charging cut-off voltage of the battery to be charged is determined according to the platform voltage and a preset voltage value, wherein the charging cut-off voltage is greater than the platform voltage.

5. The charging method according to claim 4, characterized in that: The step of determining the charging cut-off voltage of the battery to be charged according to the platform voltage and a preset voltage value includes: The sum of the platform voltage and a preset voltage value is calculated, and the calculated sum is used as the charging cut-off voltage of the battery to be charged.

6. The charging method according to claim 5, characterized in that: The preset voltage value is greater than or equal to 0.01 mV and less than or equal to 1000 mV.

7. The charging method according to claim 5, characterized in that: The preset voltage value is determined according to a target corresponding relationship, and the target corresponding relationship is: a corresponding relationship between the gram capacity of the active material of the battery to be charged and the voltage value after the voltage value exceeds the platform voltage.

8. The charging method according to claim 7, characterized in that: In the target correspondence, the target ratio is greater than or equal to 0.3 and less than or equal to 0.7, wherein the target ratio is the ratio between the voltage value exceeding the platform voltage and the gram capacity exceeding the target gram capacity, and the target gram capacity is the gram capacity corresponding to the platform voltage.

9. A charging device, characterized in that: include: A temperature acquisition module, used to acquire the temperature of the battery to be charged; An activation energy data acquisition module, used to acquire activation energy data of the battery to be charged; A charging cut-off voltage determination module, used to determine the charging cut-off voltage according to the temperature and the activation energy data; The charging module is used to charge the battery to be charged and control the maximum charging voltage of the battery to be charged to be less than or equal to the charging cut-off voltage.

10. A charging management device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 8 is implemented.

11. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 8 is implemented.

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