Battery charging method and device, medium and vehicle

Abstract

The invention relates to a battery charging method and device, a medium and a vehicle, and relates to the technical field of charging, and the method comprises the steps: obtaining the single voltage, temperature and state of charge of a battery in the charging process; before the single voltage reaches a protection voltage corresponding to a charge state threshold value, a first target charging rate is determined according to the charge state and the temperature, and the charge state threshold value is determined according to the charge state when the charging safety parameter meets the safety condition; and controlling the battery to be charged at the first target charging rate. Thus, the monomer voltage of the battery is not limited by the protection voltage corresponding to the charge state smaller than the charge state threshold value, and the charging capacity of the battery is higher before the monomer voltage of the battery reaches the protection voltage corresponding to the charge state threshold value. And the state-of-charge threshold is determined according to the state-of-charge when the charging safety parameter meets the safety condition, so that the charging speed of the battery can be improved on the premise of meeting the charging safety of the battery.

Description

Technical Field

[0001] The present disclosure relates to the field of charging technology, and in particular to a battery charging method, device, medium and vehicle. Background Art

[0002] The faster the battery charges, the greater the threat to charging safety. The problem existing in related technologies is how to further increase the battery charging speed while ensuring battery safety. Summary of the invention

[0003] In order to overcome the problems existing in the related art, the present disclosure provides a battery charging method, device, medium and vehicle.

[0004] According to a first aspect of an embodiment of the present disclosure, there is provided a battery charging method, comprising:

[0005] Obtain the single cell voltage, temperature and state of charge of the battery during the charging process;

[0006] Before the cell voltage reaches a protection voltage corresponding to a state of charge threshold, determining a first target charging rate according to the state of charge and the temperature, wherein the state of charge threshold is determined according to the state of charge when a charging safety parameter satisfies a safety condition;

[0007] The battery is controlled to be charged at the first target charging rate.

[0008] Optionally, determining a first target charging rate according to the state of charge and the temperature includes:

[0009] A first target charging rate is determined according to a preset relationship between the state of charge, the temperature and the charging rate, wherein the charging rate is linearly positively correlated with the temperature and linearly negatively correlated with the state of charge.

[0010] Optionally, the method further comprises:

[0011] Obtaining a preset data table, wherein the preset data table includes charging rates corresponding to different temperature intervals and different state of charge intervals, and each state of charge interval in each temperature interval corresponds to a charging rate;

[0012] Interpolation is performed within the temperature range and the state of charge range, and charging rates corresponding to different temperatures and different states of charge are determined to obtain the preset relationship.

[0013] Optionally, determining a first target charging rate according to the state of charge and the temperature includes:

[0014] Determining a state-of-charge interval in which the state of charge is located, and a temperature interval in which the temperature is located;

[0015] According to the state of charge range and the temperature range, the first target charging rate is determined from a preset data table, wherein the preset data table includes charging rates corresponding to different temperature ranges and different state of charge ranges, and each state of charge range within each temperature range corresponds to a charging rate.

[0016] Optionally, the method further comprises:

[0017] After the cell voltage reaches the protection voltage corresponding to the state of charge threshold, determining a first charging rate according to the state of charge and the temperature, and determining a second charging rate according to the temperature and the cell voltage;

[0018] Determining a second target charging rate according to the first charging rate and the second charging rate;

[0019] The battery is controlled to be charged at the second target charging rate.

[0020] Optionally, determining a second target charging rate according to the first charging rate and the second charging rate includes:

[0021] The smaller charging rate between the first charging rate and the second charging rate is determined as the second target charging rate.

[0022] Optionally, the charging safety parameters include a lithium precipitation window and an expansion force, and the method further includes:

[0023] Acquire first change data of the lithium deposition window of the battery when charged at different temperatures as the state of charge changes, and acquire second change data of the expansion force of the battery when charged at different temperatures as the state of charge changes;

[0024] The state of charge threshold that satisfies a safety condition is determined according to the first change data and the second change data.

[0025] Optionally, determining the state of charge threshold that satisfies a safety condition according to the first change data and the second change data includes:

[0026] Acquire from the first change data a first state-of-charge interval corresponding to a change value of the lithium deposition window being greater than or equal to a first threshold, and acquire from the second change data a second state-of-charge interval corresponding to a change value of the expansion force being greater than or equal to a second threshold;

[0027] The state of charge threshold is determined according to the first state of charge interval and the second state of charge interval.

[0028] According to a second aspect of an embodiment of the present disclosure, there is provided a battery charging device, comprising:

[0029] An acquisition module is configured to acquire a single cell voltage, a temperature and a state of charge of the battery during the charging process;

[0030] a determination module configured to determine a first target charging rate according to the state of charge and the temperature before the cell voltage reaches a protection voltage corresponding to a state of charge threshold, wherein the state of charge threshold is determined according to the state of charge when the charging safety parameter satisfies a safety condition;

[0031] The control module is configured to control the battery to be charged at the first target charging rate.

[0032] According to a third aspect of an embodiment of the present disclosure, a computer-readable storage medium is provided, on which computer program instructions are stored. When the program instructions are executed by a processor, the battery charging method provided by the first aspect of the present disclosure is implemented.

[0033] According to a fourth aspect of an embodiment of the present disclosure, a vehicle is provided, comprising:

[0034] a storage device including a computer program;

[0035] A processing device is used to execute the computer program to implement the battery charging method provided in the first aspect of the present disclosure.

[0036] The technical solution provided by the embodiments of the present disclosure may have the following beneficial effects:

[0037] In the disclosed embodiment, before the cell voltage reaches the protection voltage corresponding to the state of charge threshold, the first target charging rate is determined according to the state of charge and the temperature, and the battery is controlled to be charged at the first target charging rate. In this way, the cell voltage of the battery will not be limited by the protection voltage corresponding to the state of charge that is less than the state of charge threshold. Before the cell voltage of the battery reaches the protection voltage corresponding to the state of charge threshold, the battery has a stronger charging capacity, and the state of charge threshold is determined according to the state of charge when the charging safety parameters meet the safety conditions. Therefore, this solution can improve the charging speed of the battery while meeting the battery charging safety.

[0038] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0040] Figure 1 It is a curve diagram showing the change of charging rate with state of charge value in the battery charging method of the related art.

[0041] Figure 2 It is a schematic diagram of the numerical relationship between the state of charge and the protection voltage in the battery charging method of the related art.

[0042] Figure 3 It is a diagram showing the relationship between the battery state of charge and the maximum charging current value at different temperatures.

[0043] Figure 4 The figure is a flow chart of a battery charging method according to an exemplary embodiment.

[0044] Figure 5 The figure is a schematic diagram showing the numerical relationship between the state of charge and the protection voltage in a battery charging method according to an exemplary embodiment.

[0045] Figure 6 The figure is a schematic diagram showing the variation of charging rate with state of charge at the same temperature in a battery charging method according to an exemplary embodiment.

[0046] Figure 7 It is a schematic diagram comparing curves of charging rate versus state of charge obtained according to the related art and the battery charging method disclosed herein.

[0047] Figure 8 The invention is a block diagram of a battery charging device according to an exemplary embodiment.

[0048] Fig. 9 is a block diagram of a vehicle according to an exemplary embodiment. DETAILED DESCRIPTION

[0049] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0050] As the production and sales volume of new energy vehicles in my country increases year by year, the contradiction of energy replenishment for new energy vehicles is becoming increasingly acute. Improving charging efficiency and shortening the charging time of a single vehicle are effective measures to solve the current difficulty in charging new energy vehicles. For NCM system batteries, the appropriate charging rate of the battery can be determined by using the battery's state of charge (SOC) and temperature through a table lookup method. Each state of charge corresponds to a protection voltage value. In this table lookup method, the charging rate curve at a certain temperature is obtained as follows: Figure 1 The step curve shown, Figure 1 The horizontal axis represents the state of charge, and the vertical axis represents the charging rate or charging current.

[0051] For example, the charging rate table shown in Table 1 below can be used. During the battery charging process, a charging rate is determined according to the battery's state of charge and temperature, and another charging rate is determined according to the battery's single cell voltage value and temperature, and the final rate for charging the battery is determined based on the two charging rates. In Table 1, SOC represents the state of charge, T represents the temperature, V represents the single cell protection voltage corresponding to the state of charge, C represents the charging rate, and SOC1<SOC2<SOC3<SOC4, V1<V2<V3<V4, C0>C1>C2>C3, T1<Temp2<Temp3. It can be understood that the protection voltage of the battery increases monotonically with the increase of the state of charge, and the numerical relationship between the state of charge and the protection voltage is as follows. Figure 2 As shown, Figure 2 The horizontal axis represents the state of charge value, and the vertical axis represents the protection voltage value.

[0052] Table 1 First battery charging rate table

[0053]

[0054]

[0055] For example, the battery charging rate is looked up according to Table 1. When the current state of charge value of the battery is between two state of charge values ​​in Table 1, the larger state of charge value between the two state of charge values ​​is selected, and when the current temperature value is between two temperature values ​​in Table 1, the smaller temperature value between the two temperature values ​​is selected. In this way, the first charging rate value is determined by looking up the table; for example, the current state of charge value SOC and the current temperature value T are determined. If SOC1<SOC≤SOC2, the SOC2 column is selected for the corresponding SOC, and if T1≤T<T2, the T row is selected for the T1 row. In this way, a charging rate C2 is obtained by looking up Table 1 and crossing. When the current cell voltage value of the battery is between the two protection voltage values ​​in Table 1, the larger protection voltage value between the two protection voltage values ​​is selected, and the current temperature value is between the two temperature values ​​in Table 1, the smaller temperature value between the two temperature values ​​is selected, so as to determine the second charging rate value by looking up the table; for example, determine the current cell voltage value V and the current temperature value T, if V2<V≤V3, then select the V3 column for the corresponding cell voltage, if T1≤T<T2, then select the T1 row for the T row, so as to cross-check Table 1 to obtain a charging rate C3. After determining the first charging rate value and the second charging rate value, the smaller value of the first charging rate value and the second charging rate value can be used as the charging rate for charging the battery. As in the above example, since C2 is greater than C3, C3 can be selected as the charging rate for charging the battery.

[0056] Through the above method, the charging rate of the state of charge is as follows Figure 1 However, since the battery contains multiple cells, when the cell voltage of the cell reaches the protection voltage corresponding to the state of charge first, the actual state of charge of the battery as a whole has not yet reached the current jump point. Figure 3 , shows the variation curve of the maximum charging current of the battery with the state of charge at different temperatures between -20℃ and 5℃. It can be seen that when the state of charge of the battery is small at different temperatures, the maximum charging current value of the battery can be very large, so the protection voltage corresponding to the state of charge limits the charging capacity of the battery.

[0057] See also Figure 4 , Figure 4 is a flow chart of a battery charging method according to an exemplary embodiment. Figure 4 As shown, the battery charging method is used in a terminal and includes the following steps.

[0058] In step S401, the cell voltage, temperature and state of charge of the battery during charging are obtained.

[0059] For example, electrochemical energy storage batteries include lead-acid batteries, lithium-ion batteries, flow batteries, nickel-metal hydride batteries, etc., and the battery may include multiple strings of batteries, and each single string of batteries may include a single cell, or multiple single cells connected in parallel. The single cell voltage is the voltage value of each single cell, and the single cell voltage here can be the maximum voltage value among multiple single cells. The battery is provided with a management device for managing single cells. For example, the battery management system (BMS) can be used to obtain the single cell voltage of each string of single cells in the battery. Among them, the battery management system is a control system for protecting the safety of power batteries, which can monitor the battery usage status at all times.

[0060] For example, the temperature can be measured by a temperature sensor, or a thermistor can be set on the surface of the battery for sampling. The resistance of the thermistor can increase as the temperature rises. Therefore, the resistance of the thermistor can be monitored in real time, and the corresponding temperature can be determined based on the corresponding relationship between the resistance and the temperature. The state of charge can be sampled by a fuel gauge, which can monitor the discharge amount of the battery during discharge and the charge amount of the battery during charging, and calculate the state of charge SOC value of the battery. The overall voltage of the battery can be obtained according to the battery management system, and the single cell voltage of the single cell can be sampled by the battery's analog front end (Active Front End, AFE).

[0061] In step S402, before the cell voltage reaches the protection voltage corresponding to the state of charge threshold, a first target charging rate is determined according to the state of charge and temperature, and the state of charge threshold is determined according to the state of charge when the charging safety parameter meets the safety condition.

[0062] For example, the state of charge threshold determined by the charging safety parameters under different circumstances is different, and the protection voltage corresponding to the state of charge threshold is also different. The charging safety parameters may include a lithium deposition window and an expansion force. For example, the state of charge threshold corresponding to the temperature state may be determined based on the change data of the lithium deposition window with the state of charge at the same temperature, the state of charge threshold corresponding to the temperature state may be determined based on the change data of the expansion force with the state of charge at the same temperature, or the state of charge threshold determined according to the lithium deposition window and the state of charge threshold determined according to the expansion force at the same temperature may be combined to determine the final state of charge threshold at the temperature.

[0063] For example, due to the different charging capabilities of single cells, after the single cell voltage of the single cell reaches the protection voltage corresponding to a certain stage of charge state, the protection voltage limits the charging rate so that the battery charging enters the next stage. The actual charge state value of the battery as a whole has not yet reached the charge state to enter the next stage, and the charging rate in the next stage is smaller. Figure 3It can be seen that when the battery is at the same temperature and the state of charge is small, the charging current that the battery can withstand can be very large. Before the cell voltage reaches the protection voltage corresponding to the state of charge threshold, the charging rate used to charge the battery is determined only by the state of charge and temperature, and the determined charging rate will not be limited by the cell voltage of the single cell. In this way, before the cell voltage reaches the protection voltage corresponding to the state of charge threshold, the state of charge will not be limited by the cell voltage value less than the state of charge threshold, which can maximize the battery charging energy.

[0064] In step S403, the battery is controlled to be charged at a first target charging rate.

[0065] For example, after determining the first target charging rate, the charging rate of the battery is controlled to be the first target charging rate to charge the battery. After the cell voltage reaches the protection voltage corresponding to the state of charge threshold, the battery can be controlled to determine the charging rate for charging the battery using the method in the related art.

[0066] For example, in the above scheme, the numerical relationship between the battery state of charge and the protection voltage is as follows: Figure 5 As shown, Figure 5 The horizontal axis represents the state of charge value, and the vertical axis represents the protection voltage value. It can be seen that before the state of charge threshold, the protection voltage value is a fixed value, and after the state of charge threshold, the protection voltage increases monotonically with the increase of the state of charge.

[0067] In the disclosed embodiment, before the cell voltage reaches the protection voltage corresponding to the state of charge threshold, the first target charging rate is determined according to the state of charge and the temperature, and the battery is controlled to be charged at the first target charging rate. In this way, the cell voltage of the battery will not be limited by the protection voltage corresponding to the state of charge that is less than the state of charge threshold. Before the cell voltage of the battery reaches the protection voltage corresponding to the state of charge threshold, the battery has a stronger charging capacity, and the state of charge threshold is determined according to the state of charge when the charging safety parameters meet the safety conditions. Therefore, this solution can improve the charging speed of the battery while meeting the battery charging safety.

[0068] As an optional embodiment, determining the first target charging rate according to the state of charge and the temperature includes:

[0069] The first target charging rate is determined according to a preset relationship between the state of charge, temperature and charging rate. In the preset relationship, the charging rate is linearly positively correlated with the temperature, and the charging rate is linearly negatively correlated with the state of charge.

[0070] For example, the preset relationship between the state of charge, temperature and charging rate includes a first relationship between the charging rate and temperature and a second relationship between the charging rate and the state of charge. The charging rate and temperature are generally in a step-like positive correlation, and the charging rate and the state of charge are generally in a step-like negative correlation. Here, the charging rate is linearly positively correlated with the temperature, and the charging rate is linearly negatively correlated with the state of charge. The corresponding charging rate value determined at the same state of charge value and the same temperature will be larger. Therefore, setting the charging rate to be linearly positively correlated with the temperature and linearly negatively correlated with the state of charge can further increase the charging capacity of the battery before the state of charge of the battery is less than the state of charge threshold.

[0071] As an optional embodiment, the method further includes:

[0072] Obtain a preset data table, the preset data table includes charging rates corresponding to different temperature ranges and different state of charge ranges, and each state of charge range in each temperature range corresponds to a charging rate;

[0073] Interpolation is performed within the temperature range and the state of charge range, and the charging rates corresponding to different temperatures and different states of charge are determined to obtain a preset relationship.

[0074] For example, the preset relationship can be determined according to a preset data table. For example, the preset data table can be Table 1 above, and only the temperature, state of charge and corresponding charging rate when the temperature is less than the state of charge threshold in Table 1 can be obtained, and the corresponding charging rate value can be calculated by interpolation within the temperature range and the state of charge range. Figure 6 The preset relationship curve shown in the figure, and the charging rate table shown in Table 2 below. Among them, SOCa is the interpolation between SOC1 and SOC2, SOCb is the interpolation between SOC2 and SOCX, Ta is the difference between T1 and T2, SOCX is the state of charge threshold, Vn1 is the protection voltage corresponding to the state of charge threshold at temperature value T1, and Vm1 is the protection voltage corresponding to the state of charge threshold at temperature value Ta. Ca1 is the charging rate value calculated based on T1 and SOCa, Cd2 is the charging rate value calculated based on Ta and SOCa, and other data are similar and will not be repeated here.

[0075] Table 2 Second battery charging rate table

[0076]

[0077] It can be understood that Table 2 only illustrates part of the interpolation data. The specific number of interpolations can be set according to the actual situation. In the case of more interpolations, the following can be obtained: Figure 6 The preset relationship curve is shown. Figure 6At the same temperature, when the state of charge is less than the state of charge threshold, the curve of the charge rate changing with the state of charge basically shows a linear downward relationship. When it is greater than the state of charge threshold, in order to ensure the charging safety of the battery, the curve of the charge rate changing with the state of charge is still a step-type.

[0078] As an optional embodiment, determining the first target charging rate according to the state of charge and the temperature includes:

[0079] Determine the state of charge interval in which the state of charge is located, and the temperature interval in which the temperature is located;

[0080] According to the state of charge range and the temperature range, a first target charging rate is determined from a preset data table. The preset data table includes charging rates corresponding to different temperature ranges and different state of charge ranges. Each state of charge range in each temperature range corresponds to a charging rate.

[0081] For example, when the state of charge interval and the temperature interval are not interpolated, the charge rate value can still be determined according to the preset data table. At this time, before the cell voltage reaches the protection voltage corresponding to the state of charge threshold, according to the state of charge interval where the state of charge is located and the temperature interval where the temperature is located, the charge rate corresponding to the current state of charge interval and the temperature interval can be determined as the first target charge rate. The preset data table here can be the charge rate table corresponding to Table 1 or Table 2 above.

[0082] As an optional embodiment, the method further includes:

[0083] After the cell voltage reaches the protection voltage corresponding to the state of charge threshold, determining a first charging rate according to the state of charge and the temperature, and determining a second charging rate according to the temperature and the cell voltage;

[0084] Determine a second target charging rate according to the first charging rate and the second charging rate;

[0085] The battery is controlled to be charged at a second target charging rate.

[0086] For example, since the greater the state of charge, the greater the risk of charging safety, after the cell voltage reaches the protection voltage corresponding to the state of charge threshold, it is necessary to prioritize the charging safety of the battery. Here, the first charging rate determined by the state of charge and temperature, and the second charging rate determined by the temperature and cell voltage, are used to determine the second target charging rate to charge the battery, such as Figure 6 As shown, after the state of charge is greater than the state of charge threshold, the curve of the battery's charging rate changing with the state of charge is still step-type.

[0087] As an optional embodiment, determining the second target charging rate according to the first charging rate and the second charging rate includes:

[0088] The smaller charging rate between the first charging rate and the second charging rate is determined as the second target charging rate.

[0089] For example, if the purpose is to ensure maximum charging speed, the larger charging rate between the first charging rate and the second charging rate can be determined as the second target charging rate. If the purpose is to ensure maximum charging safety, the smaller charging rate between the first charging rate and the second charging rate can be determined as the second target charging rate. If the purpose is to ensure both charging speed and charging safety, the average of the first charging rate and the second charging rate can be determined as the second target charging rate.

[0090] As an optional embodiment, the charging safety parameters include a lithium precipitation window and an expansion force, and the method further includes:

[0091] Acquire first change data of the lithium deposition window changing with the state of charge when the battery is charged at different temperatures, and acquire second change data of the expansion force changing with the state of charge when the battery is charged at different temperatures;

[0092] A state of charge threshold that satisfies a safety condition is determined according to the first change data and the second change data.

[0093] For example, the degree of safety risk when charging the battery at each temperature is different, so the state of charge threshold at that temperature can be determined based on the change data of the charging safety parameters at the same temperature during charging. Charging safety parameters include lithium deposition window and expansion force. There is a steep drop interval in the data when the lithium deposition window changes with the state of charge. In the steep drop interval, the lithium battery has less lithium deposition. The battery is safer to increase the charging speed in this steep drop interval; there is a rapid growth interval in the data when the expansion force changes with the state of charge. The safety risk of battery explosion caused by excessive expansion force is relatively large. Therefore, when determining the battery state of charge threshold, the rapid growth interval can be avoided to ensure the charging safety of the battery.

[0094] As an optional embodiment, determining a state of charge threshold that satisfies a safety condition according to the first change data and the second change data includes:

[0095] Obtaining from the first change data a first state-of-charge interval corresponding to a change value of the lithium deposition window being greater than or equal to a first threshold, and obtaining from the second change data a second state-of-charge interval corresponding to a change value of the expansion force being greater than or equal to a second threshold;

[0096] A state of charge threshold is determined according to the first state of charge interval and the second state of charge interval.

[0097] For example, if there is an overlapping area between the first state of charge interval and the second state of charge interval, data not including the second state of charge interval can be selected in the first state of charge interval as the state of charge threshold, for example, the first state of charge interval is (SOC1, SOC2), the second state of charge interval is (SOC3, SOC4), SOC1<SOC3<SOC4<SOC2, any state of charge value between SOC1 and SOC3 can be selected as the state of charge threshold, or any state of charge value between SOC4 and SOC2 can be selected as the state of charge threshold; further, in order to release the charging capacity of the battery as much as possible, the maximum state of charge value between SOC1 and SOC3 can be selected as the state of charge threshold, or the maximum state of charge value state of charge threshold can be selected between SOC4 and SOC2. If there is no overlapping area between the first state of charge interval and the second state of charge interval, any state of charge value can be selected in the first state of charge interval as the state of charge threshold, and the maximum state of charge value can be selected in the first state of charge interval as the state of charge threshold. It is understandable that only the method of determining the state of charge threshold at the same temperature is illustrated here, and the method of selecting the state of charge threshold at other temperatures is similar, which will not be repeated here.

[0098] For example, the curves of the charging rate versus the state of charge obtained according to the related art and the battery charging method disclosed herein are compared as follows: Figure 7 As shown, curve A is a curve showing the change of charging rate with state of charge obtained by the battery charging method of the present invention, and curve B is a curve showing the change of charging rate with state of charge obtained by the battery charging method in the related art. It can be seen that, before the state of charge threshold, the single cell voltage will not limit the charging rate of the battery by using the battery charging method of the present invention, and the charging rate is determined by interpolating the state of charge range and the temperature range, which fully releases the charging capacity of the battery. And after testing, the battery charging method of the present invention can shorten the charging time by about 9% when compared with the battery charging method in the related art.

[0099] Figure 8 is a block diagram of a battery charging device according to an exemplary embodiment. Figure 8 The battery charging device includes an acquisition module 801, a determination module 802 and a control module 803.

[0100] The acquisition module 801 is configured to acquire the cell voltage, temperature and charge state of the battery during the charging process.

[0101] The determination module 802 is configured to determine a first target charging rate according to the state of charge and temperature before the cell voltage reaches a protection voltage corresponding to a state of charge threshold, and the state of charge threshold is determined according to the state of charge when the charging safety parameter meets the safety condition.

[0102] The control module 803 is configured to control the battery to be charged at a first target charging rate.

[0103] As an optional embodiment, the determining module 802 includes:

[0104] The first determination submodule is configured to determine a first target charging rate according to a preset relationship between the state of charge, temperature and charging rate. In the preset relationship, the charging rate is linearly positively correlated with the temperature, and the charging rate is linearly negatively correlated with the state of charge.

[0105] As an optional embodiment, the battery charging device further includes:

[0106] A preset data table acquisition module is configured to acquire a preset data table, wherein the preset data table includes charging rates corresponding to different temperature intervals and different state of charge intervals, and each state of charge interval in each temperature interval corresponds to a charging rate;

[0107] The interpolation module is configured to interpolate within a temperature range and a state of charge range, and determine the charging rates corresponding to different temperatures and different states of charge to obtain a preset relationship.

[0108] As an optional embodiment, the determining module 802 includes:

[0109] A second determination submodule is configured to determine a state of charge interval in which the state of charge is located, and a temperature interval in which the temperature is located;

[0110] The third determination submodule is configured to determine a first target charging rate from a preset data table according to the state of charge range and the temperature range. The preset data table includes charging rates corresponding to different temperature ranges and different state of charge ranges, and each state of charge range in each temperature range corresponds to a charging rate.

[0111] As an optional embodiment, the battery charging device further includes:

[0112] A first determination module is configured to determine a first charging rate according to the state of charge and temperature after the cell voltage reaches a protection voltage corresponding to the state of charge threshold, and to determine a second charging rate according to the temperature and the cell voltage;

[0113] A second determination module is configured to determine a second target charging rate according to the first charging rate and the second charging rate;

[0114] The charging control module is configured to control the battery to be charged at a second target charging rate.

[0115] As an optional embodiment, the second determining module is specifically configured as follows:

[0116] The smaller charging rate between the first charging rate and the second charging rate is determined as the second target charging rate.

[0117] As an optional embodiment, the charging safety parameters include a lithium precipitation window and an expansion force, and the battery charging device further includes:

[0118] A charging safety parameter acquisition module is configured to acquire first change data of a lithium deposition window changing with a state of charge when the battery is charged at different temperatures, and to acquire second change data of an expansion force changing with a state of charge when the battery is charged at different temperatures;

[0119] The third determination module is configured to determine a state of charge threshold that meets a safety condition according to the first change data and the second change data.

[0120] As an optional embodiment, the third determining module includes:

[0121] an acquisition submodule, configured to acquire from the first change data a first state of charge interval corresponding to a change value of the lithium deposition window being greater than or equal to a first threshold, and to acquire from the second change data a second state of charge interval corresponding to a change value of the expansion force being greater than or equal to a second threshold;

[0122] The fourth determination submodule is configured to determine a state of charge threshold according to the first state of charge interval and the second state of charge interval.

[0123] Regarding the battery charging device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the battery charging method, and will not be elaborated here.

[0124] The present disclosure also provides a computer-readable storage medium having computer program instructions stored thereon, and the battery charging method provided by the present disclosure is implemented when the program instructions are executed by a processor.

[0125] The present disclosure also provides a vehicle, comprising:

[0126] a storage device including a computer program;

[0127] The processing device is used to execute a computer program to implement the battery charging method provided by the present disclosure.

[0128] Fig. 9 is a block diagram of a vehicle 900 according to an exemplary embodiment. For example, the vehicle 900 may be a hybrid vehicle, a non-hybrid vehicle, an electric vehicle, a fuel cell vehicle, or other types of vehicles. The vehicle 900 may be an autonomous vehicle or a semi-autonomous vehicle.

[0129] Reference Fig. 9 , the vehicle 900 may include various subsystems, for example, an infotainment system 910, a perception system 920, a decision control system 930, a drive system 940, and a computing platform 950. The vehicle 900 may also include more or fewer subsystems, and each subsystem may include multiple components. In addition, each subsystem and each component of the vehicle 900 may be interconnected by wire or wireless means.

[0130] In some embodiments, the infotainment system 910 may include a communication system, an entertainment system, and a navigation system, etc.

[0131] The perception system 920 may include several sensors for sensing information about the environment around the vehicle 900. For example, the perception system 920 may include a global positioning system (the global positioning system may be a GPS system, or a Beidou system or other positioning systems), an inertial measurement unit (IMU), a laser radar, a millimeter wave radar, an ultrasonic radar, and a camera.

[0132] The decision control system 930 may include a computing system, a vehicle controller, a steering system, a throttle, and a braking system.

[0133] The drive system 940 may include components that provide powered motion for the vehicle 900. In one embodiment, the drive system 940 may include an engine, an energy source, a transmission system, and wheels. The engine may be a combination of one or more of an internal combustion engine, an electric motor, and an air compression engine. The engine is capable of converting energy provided by the energy source into mechanical energy.

[0134] Some or all functions of the vehicle 900 are controlled by a computing platform 950. The computing platform 950 may include at least one processor 951 and a memory 952, and the processor 951 may execute instructions 953 stored in the memory 952.

[0135] The processor 951 may be any conventional processor, such as a commercially available CPU. The processor may also include a graphics processor (Graphic Process Unit, GPU), a field programmable gate array (Field Programmable Gate Array, FPGA), a system on chip (System on Chip, SOC), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC) or a combination thereof.

[0136] The memory 952 may be implemented by any type of volatile or nonvolatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.

[0137] In addition to instructions 953 , memory 952 may also store data, such as road maps, route information, vehicle location, direction, speed, etc. The data stored in memory 952 may be used by computing platform 950 .

[0138] In the embodiment of the present disclosure, the processor 951 may execute instruction 953 to complete all or part of the steps of the above-mentioned map fusion method.

[0139] In another exemplary embodiment, a computer program product is further provided. The computer program product includes a computer program executable by a programmable device, and the computer program has a code portion for executing the above-mentioned map fusion method when executed by the programmable device.

[0140] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the present disclosure. This application is intended to cover any variations, uses or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and examples are to be considered as exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0141] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A battery charging method, characterized in that: include: Obtain the single cell voltage, temperature and state of charge of the battery during the charging process; Before the cell voltage reaches a protection voltage corresponding to a state of charge threshold, determining a first target charging rate according to the state of charge and the temperature, wherein the state of charge threshold is determined according to the state of charge when a charging safety parameter satisfies a safety condition; The battery is controlled to be charged at the first target charging rate.

2. The method according to claim 1, characterized in that Determining a first target charging rate according to the state of charge and the temperature includes: A first target charging rate is determined according to a preset relationship between the state of charge, the temperature and the charging rate, wherein the charging rate is linearly positively correlated with the temperature and linearly negatively correlated with the state of charge.

3. The method according to claim 2, characterized in that The method further comprises: Obtaining a preset data table, wherein the preset data table includes charging rates corresponding to different temperature intervals and different state of charge intervals, and each state of charge interval in each temperature interval corresponds to a charging rate; Interpolation is performed within the temperature range and the state of charge range, and charging rates corresponding to different temperatures and different states of charge are determined to obtain the preset relationship.

4. The method according to claim 1, characterized in that Determining a first target charging rate according to the state of charge and the temperature includes: Determining a state-of-charge interval in which the state of charge is located, and a temperature interval in which the temperature is located; According to the state of charge range and the temperature range, the first target charging rate is determined from a preset data table, wherein the preset data table includes charging rates corresponding to different temperature ranges and different state of charge ranges, and each state of charge range within each temperature range corresponds to a charging rate.

5. The method according to any one of claims 1 to 4, characterized in that: The method further comprises: After the cell voltage reaches the protection voltage corresponding to the state of charge threshold, determining a first charging rate according to the state of charge and the temperature, and determining a second charging rate according to the temperature and the cell voltage; Determining a second target charging rate according to the first charging rate and the second charging rate; The battery is controlled to be charged at the second target charging rate.

6. The method according to claim 5, characterized in that Determining a second target charging rate according to the first charging rate and the second charging rate includes: The smaller charging rate between the first charging rate and the second charging rate is determined as the second target charging rate.

7. The method according to any one of claims 1 to 4, characterized in that: The charging safety parameters include a lithium precipitation window and an expansion force, and the method further includes: Acquire first change data of the lithium deposition window of the battery when charged at different temperatures as the state of charge changes, and acquire second change data of the expansion force of the battery when charged at different temperatures as the state of charge changes; The state of charge threshold that satisfies a safety condition is determined according to the first change data and the second change data.

8. The method according to claim 7, characterized in that Determining the state of charge threshold that satisfies a safety condition according to the first change data and the second change data includes: Acquire from the first change data a first state-of-charge interval corresponding to a change value of the lithium deposition window being greater than or equal to a first threshold, and acquire from the second change data a second state-of-charge interval corresponding to a change value of the expansion force being greater than or equal to a second threshold; The state of charge threshold is determined according to the first state of charge interval and the second state of charge interval.

9. A battery charging device, characterized in that: include: An acquisition module is configured to acquire a single cell voltage, a temperature and a state of charge of the battery during the charging process; a determination module configured to determine a first target charging rate according to the state of charge and the temperature before the cell voltage reaches a protection voltage corresponding to a state of charge threshold, wherein the state of charge threshold is determined according to the state of charge when the charging safety parameter satisfies a safety condition; The control module is configured to control the battery to be charged at the first target charging rate.

10. A computer-readable storage medium having computer program instructions stored thereon, characterized in that: When the program instructions are executed by a processor, the battery charging method described in any one of claims 1 to 8 is implemented.

11. A vehicle, characterized in that: include: a storage device including a computer program; A processing device, used to execute the computer program to implement the battery charging method described in any one of claims 1-8.

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