Charging adjustment method and device, charging equipment, power system and storage medium

Abstract

The application discloses a charging adjustment method and device, a charging device, a power system and a storage medium, and belongs to the technical field of new energy. The method comprises the following steps: in the process of charging a battery to be charged, temperature distribution data of the surface of the battery to be charged, pressure distribution data of the surface of the battery to be charged and the residual capacity of the battery to be charged are acquired; the current state of the battery to be charged is judged according to the temperature distribution data, the pressure distribution data, the residual capacity and the coupling relationship between parameters when the battery to be charged is in thermal runaway or lithium precipitation; in the case that the battery to be charged is judged to be in thermal runaway or lithium precipitation according to parameters in multiple dimensions, the charging current is adjusted to obtain an adjusted charging current; and the battery to be charged is charged according to the adjusted charging current. The accuracy of the judgment result is improved, and the safety of the charging process is improved while the charging rate is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy, in particular to a charging adjustment method and device, a charging equipment, a power system and a storage medium. BACKGROUND

[0002] With the rapid development of the domestic new energy industry in recent years, the annual installed capacity of new energy vehicles and electrochemical energy storage has increased significantly year by year. As an important energy unit of the power system and the energy storage system, the performance and safety of the direct current side battery system directly determine the performance and safety of the power system and the energy storage system. Among the battery-related performance, the charging rate is one of the important performance indicators. When the battery is fast-charged, a large current can cause the internal temperature of the battery to rise rapidly, thereby causing a thermal runaway safety problem. A large current can also cause excessive polarization of the battery, thereby causing lithium precipitation. These two factors become the factors that restrict the charging rate.

[0003] The current method usually analyzes and diagnoses the battery state according to the collected voltage data, current data and environmental temperature data. However, the environmental temperature data has non-in-situ and hysteresis characteristics, and the voltage changes under fast charging are highly interfered, so it is impossible to perform in-situ real-time and high-precision detection. This reduces the accuracy of the battery state judgment and the safety of the charging process. SUMMARY

[0004] The present application provides a charging adjustment method, device, equipment, power system and storage medium, which improves the accuracy of the judgment result, ensures the charging rate, and improves the safety of the charging process. The technical solution is as follows:

[0005] In a first aspect, a charging adjustment method is provided, which includes: obtaining temperature distribution data of the surface of a battery to be charged, pressure distribution data of the surface of the battery to be charged, and the remaining capacity of the battery to be charged during the charging of the battery to be charged; adjusting the charging current according to the temperature distribution data, the pressure distribution data, the remaining capacity, and the coupling relationship between the parameters when the battery to be charged occurs thermal runaway or lithium precipitation, to obtain the adjusted charging current; and charging the battery to be charged according to the adjusted charging current.

[0006] In a second aspect, a charging adjustment device is provided, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the computer program implements the method of the first aspect when executed by the processor.

[0007] In a third aspect, a charging device is provided. The charging device is configured to receive temperature distribution data transmitted by a temperature sensor, pressure distribution data transmitted by a pressure sensor, and residual capacity data transmitted by a capacity detection device during charging of a battery to be charged; adjust a charging current according to the temperature distribution data, the pressure distribution data, the residual capacity data, and a coupling relationship between parameters of the battery to be charged when thermal runaway or lithium precipitation occurs; and charge the battery to be charged according to the adjusted charging current.

[0008] In a fourth aspect, a power system is provided. The power system includes a battery to be charged, a temperature sensor, a pressure sensor, and a charging adjustment device as described in the second aspect. The charging adjustment device is in communication with the temperature sensor and the pressure sensor, respectively. The temperature sensor is configured to detect temperature distribution data of a surface of the battery to be charged. The pressure sensor is configured to detect pressure distribution data of the surface of the battery to be charged. The charging adjustment device is configured to obtain residual capacity data of the battery to be charged, and adjust a charging current according to the temperature distribution data, the pressure distribution data, the residual capacity data, and a coupling relationship between parameters of the battery to be charged when thermal runaway or lithium precipitation occurs, to obtain an adjusted charging current. The battery to be charged is charged according to the adjusted charging current.

[0009] In a fifth aspect, a power system is provided. The power system includes a battery to be charged, a temperature sensor, a pressure sensor, a capacity detection device, and a charging device as described in the third aspect. The charging device is in communication with the temperature sensor, the pressure sensor, and the capacity detection device, respectively. The temperature sensor is configured to detect temperature distribution data of a surface of the battery to be charged. The pressure sensor is configured to detect pressure distribution data of the surface of the battery to be charged. The capacity detection device is configured to detect residual capacity data of the battery to be charged. The charging device is configured to adjust a charging current according to the temperature distribution data, the pressure distribution data, the residual capacity data, and a coupling relationship between parameters of the battery to be charged when thermal runaway or lithium precipitation occurs, to obtain an adjusted charging current. The battery to be charged is charged according to the adjusted charging current.

[0010] In a sixth aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the method of the first aspect is implemented.

[0011] In a seventh aspect, a computer program product including instructions which, when executed on a computer, cause the computer to carry out the method of the first aspect.

[0012] The embodiment of the present application provides a charging adjustment method and device, a charging device, a power system and a storage medium. According to the scheme provided in the present application, in the process of charging the battery to be charged, the temperature distribution data of the surface of the battery to be charged, the pressure distribution data of the surface of the battery to be charged and the remaining power of the battery to be charged are obtained; the temperature sensor and the pressure sensor are arranged on the detection area of the surface of the battery to be charged. Compared with the environmental temperature and voltage collected in the related art, the detected temperature and pressure can more accurately reflect the current state of the battery to be charged. The temperature parameter of the battery to be charged can reflect the thermal runaway phenomenon; in the case that the remaining power parameter is constant and the temperature parameter is constant, the pressure parameter of the battery to be charged can reflect the lithium precipitation phenomenon; based on this, the coupling relationship between the temperature parameter, the pressure parameter and the remaining power parameter of the battery to be charged when thermal runaway occurs or lithium precipitation occurs is constructed. In the process of charging the battery to be charged according to the charging current, the current state of the battery to be charged is judged according to the temperature distribution data, the pressure distribution data, the remaining power and the coupling relationship between the parameters of the battery to be charged when thermal runaway occurs or lithium precipitation occurs. In the case that the battery to be charged is judged to have thermal runaway or lithium precipitation phenomenon according to the parameters in multiple dimensions, the charging current is adjusted to obtain the adjusted charging current; and the battery to be charged is charged according to the adjusted charging current. The accuracy of the judgment result is improved, and the safety of the charging process is improved while ensuring the charging rate. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating laborious work.

[0014] Figure 1 A structural schematic diagram of an energy storage device provided by the embodiment of the present application;

[0015] Figure 2 A structural schematic diagram of a battery provided by the embodiment of the present application;

[0016] Figure 3 A structural schematic diagram of another battery provided by the embodiment of the present application;

[0017] Figure 4 A flowchart of a charging adjustment method provided by the embodiment of the present application;

[0018] Figure 5 A flowchart of another charging adjustment method provided by the embodiment of the present application;

[0019] Figure 6 FIG. 4 is a schematic diagram of a relationship among temperature, residual capacity and maximum charging current without lithium precipitation provided by an embodiment of the present application;

[0020] Figure 7 FIG. 5 is a schematic diagram of a relationship among temperature, residual capacity and pressure parameter provided by an embodiment of the present application;

[0021] Figure 8 FIG. 6 is a flowchart of still another charging adjustment method provided by an embodiment of the present application;

[0022] Figure 9 FIG. 7 is a flowchart of yet another charging adjustment method provided by an embodiment of the present application;

[0023] Figure 10 FIG. 8 is a schematic diagram of a corresponding relationship among temperature, residual capacity and charging rate provided by an embodiment of the present application;

[0024] Figure 11 FIG. 9 is a structural schematic diagram of a charging adjustment device provided by an embodiment of the present application;

[0025] Figure 12 FIG. 10 is a structural schematic diagram of a power system provided by an embodiment of the present application;

[0026] Figure 13 FIG. 11 is a structural schematic diagram of another power system provided by an embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0028] It should be understood that the “multiple” mentioned in the present application refers to two or more. In the description of the present application, unless otherwise specified, “ / ” represents the meaning of or, for example, A / B can represent A or B; “and / or” in the present application is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the three cases of A alone, A and B together, and B alone. In addition, in order to clearly describe the technical solutions of the present application, the same items or similar items with basically the same functions and effects are distinguished by using “first”, “second” and the like. Those skilled in the art can understand that “first”, “second” and the like do not limit the quantity and execution order, and “first”, “second” and the like do not necessarily mean different.

[0029] Before the embodiments of the present application are explained in detail, the application scenarios and related technologies of the embodiments of the present application are described.

[0030] When fast charging a battery, the high current causes a rapid rise in internal battery temperature, leading to excessively high temperatures in various areas of the cell, both internally and on the surface, directly impacting battery safety and lifespan. Furthermore, fast charging is highly susceptible to voltage fluctuations, making in-situ, real-time, and high-precision detection impossible, introducing uncertainty into the determination of lithium plating boundaries and fast charging strategies. Therefore, there is an urgent need to provide a method for adjusting the battery charging current to achieve fast charging while effectively improving the safety and cycle performance of the battery system.

[0031] This application provides an energy storage device, such as... Figure 1 As shown, Figure 1 This is a schematic diagram of an energy storage device provided in an embodiment of this application. This energy storage device can be applied to power systems, such as new energy vehicles, drones, robots, medical devices, electric wheelchairs, and smart consumer electronics.

[0032] The energy storage device includes a battery to be recharged. Figure 1 (shown as two interconnected batteries), temperature sensor, pressure sensor ( Figure 1 The diagram shows a thin-film pressure sensor and a charging adjustment device, which is connected to both a temperature sensor and a pressure sensor. The temperature sensor detects temperature distribution data on the surface of the battery to be charged; the pressure sensor detects pressure distribution data on the surface of the battery to be charged; and the charging adjustment device acquires the remaining charge of the battery to be charged and, based on the temperature distribution data, pressure distribution data, and remaining charge, implements the charging adjustment method described in any of the following embodiments.

[0033] In this embodiment, pressure distribution data of the battery is acquired using a pressure sensor disposed on the battery surface. The pressure sensor has multiple pressure detection points on the battery surface to detect pressure data in different areas. When the battery to be recharged consists of only one cell (i.e., a single battery cell), the pressure sensor can be directly attached to the battery surface; when the battery to be recharged consists of multiple arrays of cells (i.e., a battery module), ... Figure 1 The diagram shows two interconnected batteries, with a pressure sensor clamped between the two adjacent batteries.

[0034] It can be understood that the large current during fast charging can cause excessive polarization of the battery, and then cause lithium precipitation. Due to the consistency problem of the battery, the lithium precipitation position of the battery when lithium precipitation occurs is often not fixed. If the pressure of the battery is detected through a single pressure detection point, the position where lithium precipitation actually occurs is often missed, reducing the accuracy of the battery state judgment. In the embodiment of the present application, the pressure sensor is provided with a plurality of pressure detection points, which are arranged on the surface of the battery for detecting the pressure data of different regions of the battery surface respectively. In this way, the pressure distribution data of different regions of the battery during fast charging can be obtained, which can effectively represent the pressure change trend of each region of the battery.

[0035] In the embodiment of the present application, the temperature distribution data of the battery is obtained by the temperature sensor arranged on the surface of the battery. The temperature sensor is provided with a plurality of temperature detection points arranged on the surface of the battery for detecting the temperature data of different regions of the battery surface respectively. When the battery to be charged is provided with only one battery (i.e. a battery monomer), the temperature sensor can be directly attached to the surface of the battery; when the battery to be charged is provided with a plurality of arrays of batteries (i.e. a battery module), the temperature sensor can be clamped between two adjacent batteries.

[0036] It can be understood that the consistency of the battery surface temperature under large current during fast charging is poor, and the battery state cannot be accurately represented by a single temperature detection point. For example, when the traditional square shell cell is subjected to large charging rate fast charging, the highest temperature point is often concentrated in the center of the cell surface and the tab position, and the maximum temperature difference of each region of the cell surface can reach more than 15℃. Therefore, it is difficult to accurately represent the temperature change of the battery by only a single temperature detection point to obtain the temperature of the battery. In the embodiment of the present application, the temperature sensor is provided with a plurality of temperature detection points arranged on the surface of the battery for detecting the temperature data of different regions of the battery surface respectively. In this way, the temperature distribution data of different regions of the battery during fast charging can be obtained, which can effectively represent the temperature change trend of each region of the battery, for example, the maximum temperature and the maximum temperature difference of the battery during fast charging.

[0037] In the embodiment of the present application, the pressure detection points on the pressure sensor and the temperature detection points on the temperature sensor are correspondingly arranged. That is, in the region of any one pressure detection point, a temperature detection point can be arranged to detect the temperature of the region to obtain the coupling relationship between the pressure, temperature and current of the region. In the embodiment of the present application, the pressure and temperature of the same region or the same detection point need to be detected, so when the battery surface is provided with a plurality of temperature detection points and a plurality of pressure detection points, the pressure detection points can correspond to the temperature detection points one by one, that is, a corresponding temperature detection point is arranged at each pressure sensing point.

[0038] Generally, the temperature transfer rate is faster than the expansion force (also referred to as pressure) transfer rate on the surface of the battery, which makes the temperature in a certain area on the surface of the battery not much different, and thus, when detecting the temperature on the surface of the battery, fewer temperature detection points can be set; however, the local expansion or lithium precipitation of the battery is difficult to transfer due to the influence of the structure of the battery itself, and thus, compared with the temperature detection points, more pressure detection points can be set. Based on this, in some embodiments, the number of temperature detection points can be less than the number of pressure detection points, and multiple pressure detection points can be set in the area corresponding to one temperature detection point, and the temperature data detected by the temperature detection point is shared by the pressure detection points.

[0039] In the embodiments of the present application, the surface of the battery is taken as an example, that is, the front surface (or the large surface of the cell) of the battery, the battery has a front surface and a side surface adjacent to the front surface, the two battery front surfaces are oppositely arranged, and the multiple pressure detection points of the pressure sensor are clamped and arranged between the front surfaces of the two batteries; when the front surfaces of the two batteries are provided with a baffle (or a partition plate), the multiple pressure detection points are clamped and arranged between the front surface of any one of the two batteries and the baffle. That is, when there is no other component between the two adjacent batteries, the pressure detection points are clamped and arranged between the two adjacent batteries; when the baffle is arranged between the two adjacent batteries, the pressure detection points are clamped between the baffle and the battery to be charged. The adjacent object of the battery can be another adjacent battery or an adjacent baffle. Similarly, the same is true for the multiple temperature detection points of the temperature sensor, which will not be described here.

[0040] In some embodiments, the above-mentioned pressure sensor is a thin film pressure sensor. Multiple pressure detection points are arranged thereon, and the pressure distribution data of different areas of the battery can be obtained.

[0041] As shown in Figure 2 , a structural schematic diagram of a battery is provided in the embodiments of the present application. Figure 2 As shown in Figure 2 , two adjacent batteries are shown in a disassembled form, so that the arrangement positions of the thin film pressure sensor and the temperature sensor can be more fully seen. The thin film pressure sensor includes an expansion force sensing part, one pressure detection point or multiple pressure detection points can be arranged on the expansion force sensing part, and the expansion force sensing part is clamped and arranged between the front surfaces of the two batteries. The area where the temperature detection point of the temperature sensor is located is in the same area as the expansion force sensing part.

[0042] The battery to be charged in the embodiments of the present application can also include more batteries, as shown in Figure 3 , another structural schematic diagram of a battery is provided in the embodiments of the present application, Figure 3 Figure 3 ​The temperature sensor and the pressure sensor can be arranged as shown in the above Figure 2 The battery shown in the above

[0043] The application provides a charging adjustment method, which is applied to the charging adjustment device in the above Figure 1 The charging adjustment device can be a battery management system (BMS). As shown in the above Figure 4 Figure 4 is a flowchart of the charging adjustment method provided by the application. The charging adjustment method comprises the following steps.

[0044] S101, in the process of charging the battery to be charged, obtaining temperature distribution data of the surface of the battery to be charged, pressure distribution data of the surface of the battery to be charged and the remaining capacity of the battery to be charged.

[0045] In the application, the temperature distribution data can comprise temperature values of each detection area in a plurality of detection areas on the surface of the battery to be charged; the pressure distribution data can comprise at least one pressure value and at least one pressure change rate of each detection area. One detection area corresponds to one temperature value and one pressure value or one pressure change rate, or one detection area corresponds to one temperature value and a plurality of pressure values and a plurality of pressure change rates, which means two or more. The corresponding relationship between the temperature distribution data and the pressure distribution data can be referred to the above description, and will not be repeated here.

[0046] In the application, the remaining capacity refers to the state of charge (SOC) of the battery. The SOC value can be collected by a power detection device, or calculated by the voltage method, the cumulative power integration method or the Kalman filtering method. The application does not limit this.

[0047] For example, the SOC value can be obtained by corresponding conversion according to the voltage value of the battery, SOC value=(current voltage value-minimum voltage value) / (maximum voltage value-minimum voltage value) x 100%. The SOC value can also be calculated according to the current power and the rated power, SOC value=current power / rated power x 100%. The SOC value can also be calculated according to the Kalman filtering method using current, voltage and other information.

[0048] It should be noted that the acquisition of the pressure distribution data, the acquisition of the temperature distribution data and the acquisition of the SOC value can be performed simultaneously or separately, and the application does not limit this.

[0049] ​S102, adjust the charging current according to the temperature distribution data, the pressure distribution data, the residual power, and the coupling relationship between the parameters when the battery to be charged is in thermal runaway or lithium precipitation, to obtain an adjusted charging current.

[0050] In the embodiments of the present application, the temperature parameter of the battery to be charged can reflect the thermal runaway phenomenon; in the case of a certain residual power parameter and a certain temperature parameter, the pressure parameter of the battery to be charged can reflect the lithium precipitation phenomenon; based on this, the coupling relationship between the temperature parameter, the pressure parameter and the residual power parameter when the battery to be charged is in thermal runaway or lithium precipitation is constructed, which can reflect the corresponding relationship between the temperature field, the pressure field and the current field.

[0051] It should be noted that the thermal runaway of the battery to be charged mentioned in the embodiments of the present application refers to the early stage of thermal runaway. In the early stage of thermal runaway, the battery generates heat due to external heating or internal micro-short circuit, which causes the continuous rise of the internal temperature of the battery, and further causes the evaporation of the electrolyte in the battery, so that the expansion force value collected by the pressure sensor rapidly increases.

[0052] In the embodiments of the present application, the temperature parameter of the battery to be charged is closely related to thermal management, so that a temperature-thermal management related algorithm can be constructed to calibrate and confirm the battery temperature boundary during the charging process; by comparing the distance between the temperature and the battery temperature boundary, it can be determined whether the battery to be charged is at risk of thermal runaway, so as to further determine the adjustment direction (increase, decrease or maintain) of the charging current. The pressure parameter of the battery to be charged is closely related to lithium precipitation, so that a pressure-lithium precipitation related algorithm can be constructed to calibrate and confirm the battery lithium precipitation safety boundary during the charging process; by comparing the distance between the pressure and the battery lithium precipitation safety boundary, it can be determined whether the battery to be charged is at the lithium precipitation boundary, so as to further determine the adjustment direction (increase, decrease or maintain) of the charging current. The fast charging current boundary can also be calibrated and confirmed according to the relationship between the temperature, the pressure and the residual power. Then, according to the battery temperature boundary, the battery lithium precipitation safety boundary and the fast charging current boundary, an overall fast charging strategy is formulated, and the charging current of the battery is dynamically adjusted according to the overall fast charging strategy to obtain an adjusted charging current.

[0053] In the embodiment of the present application, when the charging current is adjusted, the adjustment can be made in a gradient. After one adjustment, the temperature distribution data, the pressure distribution data and the remaining power are continuously detected to determine whether the temperature distribution data and the pressure distribution data meet the preset safety requirements. If yes, the charging current is not adjusted any more. If no, the charging current is adjusted in the next cycle until the temperature distribution data and the pressure distribution data meet the preset safety requirements. The interval time for adjustment can be appropriately set by the person skilled in the art according to the actual situation, and the embodiment of the present application does not limit this. Through the gradual adjustment mode, the charging rate can be ensured, the situation of excessive reduction of the charging rate due to excessive adjustment can be reduced, and the charging efficiency can be improved.

[0054] S103, charging the battery to be charged according to the adjusted charging current.

[0055] In the embodiment of the present application, whether the battery to be charged will have thermal runaway or whether lithium precipitation will occur is determined according to parameters in multiple dimensions, and the charging current is adjusted in a timely manner according to the determination result. The battery to be charged is charged according to the adjusted charging current, thereby reducing the safety problem of the battery fast charging and effectively improving the safety and cycle performance of the battery under the fast charging condition.

[0056] According to the scheme provided in the present application, in the process of charging the battery to be charged, the temperature distribution data of the surface of the battery to be charged, the pressure distribution data of the surface of the battery to be charged and the remaining power of the battery to be charged are obtained. The temperature sensor and the pressure sensor are arranged in the detection area of the surface of the battery to be charged. Compared with the environmental temperature and the voltage collected in the related art, the detected temperature and pressure can more accurately reflect the current state of the battery to be charged. The temperature parameter of the battery to be charged can reflect the thermal runaway phenomenon. In the case that the remaining power parameter is certain and the temperature parameter is certain, the pressure parameter of the battery to be charged can reflect the lithium precipitation phenomenon. Based on this, the coupling relationship between the temperature parameter, the pressure parameter and the remaining power parameter when the battery to be charged has thermal runaway or lithium precipitation is constructed. In the process of charging the battery to be charged according to the charging current, the current state of the battery to be charged is determined according to the temperature distribution data, the pressure distribution data, the remaining power and the coupling relationship between the parameters when the battery to be charged has thermal runaway or lithium precipitation. In the case that the battery to be charged has thermal runaway or lithium precipitation is determined according to the parameters in multiple dimensions, the charging current is adjusted to obtain the adjusted charging current. The battery to be charged is charged according to the adjusted charging current. The accuracy of the determination result is improved, and the safety of the charging process is improved while the charging rate is ensured.

[0057] In some embodiments, S102 can also be implemented in the following manner. When it is determined according to the temperature distribution data that the battery to be charged has a risk of thermal runaway, and / or when it is determined according to the temperature distribution data, the pressure distribution data and the remaining power that the battery to be charged is at the lithium precipitation boundary, the charging current is reduced to obtain an adjusted charging current.

[0058] In the embodiments of the present application, the temperature distribution data of the battery surface is obtained, which can be used for thermal runaway management of the battery during fast charging. On the other hand, in combination with the SOC value and the pressure distribution data of the battery, it can be determined whether the battery is at the lithium precipitation boundary, thereby reducing the generation of lithium precipitation.

[0059] Example 1: When it is determined according to the temperature distribution data that the battery to be charged has a risk of thermal runaway, the current charging current needs to be reduced, so that the adjusted charging current is less than the current charging current, to reduce the risk of thermal runaway, improve the safety of the charging process, reduce the irreversible loss of battery capacity, and prolong the service life of the battery to be charged. Example 2: When it is determined according to the temperature distribution data, the pressure distribution data and the remaining power that the battery to be charged is at the lithium precipitation boundary, the current charging current needs to be reduced, so that the adjusted charging current is less than the current charging current, to reduce the lithium precipitation phenomenon, improve the safety of the charging process, reduce the irreversible loss of battery capacity, and prolong the service life of the battery to be charged. Example 3: When it is determined that the battery to be charged has a risk of thermal runaway and is at the lithium precipitation boundary, the charging current is reduced to obtain an adjusted charging current. Through the judgment of the two dimensions of thermal runaway and lithium precipitation, the accuracy of the judgment result is further improved.

[0060] In some embodiments, the step of reducing the charging current to obtain an adjusted charging current can also be implemented in the following manner. The product of the charging current and a preset coefficient is taken as the adjusted charging current, and the preset coefficient is less than 1; or the difference between the charging current and a preset current is taken as the adjusted charging current.

[0061] In the embodiments of the present application, when the charging current is reduced, the adjusted charging current is obtained by multiplying a preset coefficient or reducing a preset current on the basis of the original charging current. The adjustment process in this round depends on the charging current in the last round, which improves the accuracy of the adjustment result compared with the scheme of directly adjusting the charging current to a certain fixed value.

[0062] In some embodiments, the charging adjustment process is a gradual process, after the charging current is reduced to obtain an adjusted charging current, the charging adjustment method further comprises the following steps: continuing to charge the battery to be charged according to the adjusted charging current, and obtaining new temperature distribution data, new pressure distribution data and new residual capacity; in the case that the battery to be charged is determined to exist a thermal runaway risk according to the new temperature distribution data, and / or the battery to be charged is determined to be at the lithium precipitation boundary according to the new temperature distribution data, the new pressure distribution data and the new residual capacity, the adjusted charging current is continuously reduced until the temperature distribution data and the pressure distribution data meet the preset safety requirements.

[0063] In the first round of reducing the charging current, the charging current A is multiplied by a preset coefficient, and the charging current A is subtracted by a preset current to obtain a charging current B. The battery to be charged is charged by the charging current B. If it is detected that the temperature distribution data and the pressure distribution data do not meet the preset safety requirements, that is, the battery to be charged exists a thermal runaway risk, or the battery to be charged is at the lithium precipitation boundary, the charging current B is continuously reduced. In the next round of reducing the charging current in the first round, the charging current B is multiplied by a preset coefficient, and the charging current B is subtracted by a preset current to obtain a charging current C. In this way, after one or more rounds of reduction, the battery to be charged can be determined to exist no thermal runaway risk and be at no lithium precipitation boundary.

[0064] In the embodiment of the present application, when the charging current is reduced, the reduction can be performed in a gradient manner. After one reduction, the temperature distribution data, the pressure distribution data and the residual capacity are continuously detected to determine whether the battery to be charged exists a thermal runaway risk or is at a lithium precipitation boundary. If not, the charging current is not reduced. If yes, the charging current is continuously reduced in the next cycle until the temperature distribution data and the pressure distribution data meet the preset safety requirements. By gradually reducing the charging current, the charging rate can be ensured, the situation that the charging rate is excessively reduced due to excessive adjustment can be reduced, and the charging efficiency can be improved.

[0065] In some embodiments, the temperature distribution data comprises temperature values of each detection area in a plurality of detection areas on the surface of the battery to be charged; and the pressure distribution data comprises at least one pressure value and at least one pressure change rate of each detection area. The present application further provides another charging adjustment method, as shown in Figure 5

[0066] S201, in the process of charging the battery to be charged, obtaining temperature distribution data of the surface of the battery to be charged, pressure distribution data of the surface of the battery to be charged and residual capacity of the battery to be charged. ​

[0067] S202. Based on the temperature value and remaining charge of the target detection area, determine the pressure threshold of the target detection area within the correspondence between the preset temperature range, the preset remaining charge range, and the preset pressure threshold. The preset pressure threshold indicates the pressure value corresponding to the start of lithium plating in the battery to be charged under the preset temperature range and the preset remaining charge range. The target detection area is any one of the multiple detection areas.

[0068] In this embodiment, battery expansion and material strain are key characteristics of lithium batteries. During charging and discharging, the crystalline structure of the positive electrode material exhibits a predictable change with potential, while the graphite of the negative electrode thickens due to lithium insertion during charging and thins due to lithium removal during discharging. This results in a reciprocating "breathing" effect on the overall battery thickness. In other words, the lithium plating process is accompanied by thickening of the solid electrolyte interface membrane (SEI), lithium dendrite growth, interface byproducts, and shedding of the negative electrode active layer. The lithium plating boundary can be reflected by the expansion force. During normal charging and discharging, the expansion force is affected by thermal expansion from the external temperature, exhibiting a normal variation. However, high-current fast charging causes a rapid rise in the internal battery temperature, causing the expansion force to exhibit characteristics different from the normal variation. Therefore, throughout the battery's lifespan, the battery pressure exhibits a certain pattern of change.

[0069] At a constant temperature and state of charge (SOC), lithium plating will occur when the charging current reaches a certain value. For example... Figure 6 As shown, Figure 6 This is a schematic diagram illustrating the relationship between temperature, remaining battery power, and maximum charging current without lithium plating, provided in an embodiment of this application. Figure 6 The figure shows the curves of the maximum charging current without lithium plating as a function of SOC at different temperatures. The unit of current can be amperes (A). Figure 6 As can be seen from any curve, the maximum charging current without lithium plating continuously decreases with increasing SOC, from... Figure 6 As can be seen from the multiple curves, the maximum charging current without lithium plating decreases continuously as the temperature decreases. Figure 6 The curve in the figure can be considered as the lithium plating boundary. During the experiment, the battery is charged at the maximum charging current without lithium plating under constant temperature and SOC value, and the pressure threshold and pressure change rate threshold are detected. These pressure threshold and pressure change rate threshold correspond to the lithium plating boundary. If any pressure value is greater than the pressure threshold or any pressure change rate is greater than the pressure change rate threshold, it indicates that lithium plating is about to begin in the battery to be charged.

[0070] Based on the above Figure 6The lithium precipitation boundary is shown, and the pressure parameters of the battery at the lithium precipitation boundary are detected (including the pressure threshold and the pressure change rate threshold), such as Figure 7 as shown, Figure 7 is a schematic diagram of the relationship between the temperature, the remaining power and the pressure parameter provided by the embodiments of the present application, that is, the corresponding relationship between the preset temperature interval and the preset remaining power interval and the preset pressure threshold or the preset pressure change rate threshold. At different temperatures and SOCs, different pressure thresholds or pressure change rate thresholds correspond, and the pressure threshold or the pressure change rate threshold can be obtained by experiment. The battery is charged with the maximum charging current without lithium precipitation corresponding to the lithium precipitation boundary (a certain temperature and a certain SOC), and the pressure threshold and the pressure change rate threshold are detected.

[0071] The above Figure 7 determines each pressure threshold or pressure change rate threshold according to the temperature interval and the SOC interval. Exemplarily, -30℃ to 55℃ is divided into multiple temperature intervals, for example, with a temperature difference of 10℃ as the interval division, -30℃ to -20℃ as an interval, -20℃ to -10℃ as an interval, and the division is carried out according to this rule. Correspondingly, the SOC is also divided into intervals, for example, 0 to 10% as an interval, 10% to 20% as an interval, and the division is carried out according to this rule. The pressure threshold or the pressure change rate threshold corresponding to each SOC interval and each temperature interval is obtained. The above-mentioned manner can avoid using a single value to determine the lithium precipitation boundary of the battery at different temperatures and different SOCs, and can more accurately obtain the pressure threshold and the pressure change rate threshold, so that the charging current can be more accurately adjusted during use. Moreover, by dividing the intervals, the calculation amount can be reduced, and the pressure threshold or the pressure change rate threshold can be obtained more quickly and conveniently within the temperature range and the SOC range of the battery, which has high practicability.

[0072] The above Figure 6 lists some temperature, some SOC, and the maximum charging current without lithium precipitation, and the above Figure 7 lists some temperature intervals, some SOC intervals, and the pressure parameters, which can be the pressure threshold or the pressure change rate threshold. It can be understood that Figure 6 and Figure 7 are only some exemplary descriptions, and do not represent that the embodiments of the present application are limited thereto.

[0073] Based on the above Figure 7 , taking any detection area A as an example, the temperature value and the remaining power of the detection area A are obtained, and the pressure threshold of the detection area A is found in the Figure 7 according to the interval where the temperature value is located and the interval where the remaining power is located.

[0074] It should be noted that different detection areas have different temperature values, and therefore different detection areas correspond to different pressure threshold values.

[0075] S203, in the case where any one of the at least one pressure value of the target detection area is greater than the pressure threshold value, the charging current is adjusted to obtain an adjusted charging current.

[0076] Each detection area can correspond to one or more pressure values, and if any one of the pressure values is greater than the corresponding pressure threshold value, it indicates that the battery to be charged is at the lithium precipitation boundary, and the charging current needs to be adjusted.

[0077] S204, according to the temperature value and the remaining power of the target detection area, determining the pressure change rate threshold value of the target detection area in the corresponding relationship between the preset temperature interval and the preset remaining power interval and the preset pressure change rate threshold value; the preset pressure change rate threshold value indicates the pressure change rate corresponding to the beginning of lithium precipitation of the battery to be charged under the state of the preset temperature interval and the preset remaining power interval.

[0078] The above Figure 7 The corresponding relationship between the preset temperature interval and the preset remaining power interval and the preset pressure change rate threshold value can also be represented. Taking any detection area B as an example, the temperature value and the remaining power of the detection area B are obtained, and according to the interval where the temperature value is located and the interval where the remaining power is located, the pressure change rate threshold value of the detection area B is searched in Figure 8 .

[0079] It should be noted that different detection areas have different temperature values, and therefore different detection areas correspond to different pressure change rate threshold values.

[0080] S205, in the case where any one of the at least one pressure change rate of the target detection area is greater than the pressure change rate threshold value, the charging current is adjusted to obtain an adjusted charging current.

[0081] Each detection area can correspond to one or more pressure change rates, and if any one of the pressure change rates is greater than the corresponding pressure change rate threshold value, it indicates that the battery to be charged is at the lithium precipitation boundary, and the charging current needs to be adjusted.

[0082] In the embodiments of the present application, whether the battery to be charged is at the lithium precipitation boundary can be determined by S203 or S205. When any of the at least one pressure value of any detection area is greater than the corresponding pressure threshold of the detection area, or when any of the at least one pressure change rate of any detection area is greater than the corresponding pressure change rate threshold of the detection area, it is determined that the battery to be charged is at the lithium precipitation boundary, and then the charging current is adjusted. It can be understood that the process of determining whether the battery to be charged is at the lithium precipitation boundary can also be implemented in the following manner: when any of the at least one pressure value of any detection area is greater than the corresponding pressure threshold of the detection area, and when any of the at least one pressure change rate of any detection area is greater than the corresponding pressure change rate threshold of the detection area, it is determined that the battery to be charged is at the lithium precipitation boundary. The determination of whether to be at the lithium precipitation boundary is made by using the two parameters of pressure value and pressure change rate, thereby improving the accuracy of the determination result.

[0083] According to the temperature distribution data, the pressure distribution data and the SOC value of the battery surface, it is determined whether the battery is at the local lithium precipitation boundary. If yes, the charging current is adjusted. In an implementable manner, when the pressure change rate detected by any pressure detection point on the battery surface is greater than the pressure change rate threshold under the temperature interval and the power interval, the charging current is adjusted to be lower than the pressure change rate threshold under the temperature interval and the power interval, that is, the preset safety requirement is met. Alternatively, when the pressure value detected by any pressure detection point on the battery surface is greater than the pressure threshold under the temperature interval and the power interval, the charging current is adjusted to be lower than the pressure threshold under the temperature interval and the power interval, that is, the preset safety requirement is met.

[0084] S206, charging the battery to be charged according to the adjusted charging current.

[0085] In the embodiments of the present application, the pressure threshold or the pressure change rate threshold corresponding to each pressure detection point is obtained according to the temperature value and the SOC corresponding to the pressure detection point. The pressure value detected by the pressure detection point is compared with the pressure threshold, or the pressure change rate detected by the pressure detection point is compared with the pressure change rate threshold. When the pressure value exceeds the pressure threshold, or the pressure change rate is greater than the pressure change rate threshold, the size of the charging current is adjusted, and the battery to be charged is charged according to the adjusted charging current.

[0086] In the embodiments of the present application, by acquiring the pressure distribution data of the surface of the battery, the corresponding temperature distribution data and the current SOC value, it can be accurately determined whether the battery is at the lithium precipitation boundary. When it is determined that the battery is at the lithium precipitation boundary, by adjusting the charging current, the lithium precipitation phenomenon of the battery during charging can be reduced. Further, the maximum charging current without lithium precipitation can be used as the current limit, and the charging current can be more optimally selected according to the current limit to reduce or even avoid the generation of lithium precipitation. Dynamically adjusting the charging current when the battery is at the lithium precipitation boundary can prolong the life of the battery to be charged, reduce the damage of the battery due to lithium precipitation, meet the fast charging demand of the battery (for example, super fast charging), and ensure the charging rate and the battery life.

[0087] In some embodiments, the temperature distribution data includes temperature values of each of a plurality of detection regions on the surface of the battery to be charged. The present application also provides a charging adjustment method, as shown in Figure 9

[0088] S301, in the process of charging the battery to be charged, acquiring the temperature distribution data of the surface of the battery to be charged, the pressure distribution data of the surface of the battery to be charged and the remaining capacity of the battery to be charged.

[0089] S302, in the case where any of the plurality of temperature values is greater than the temperature thermal runaway threshold value, and / or, the difference between the maximum temperature value in the plurality of temperature values and the minimum temperature value in the plurality of temperature values is greater than the temperature difference threshold value, adjusting the charging current to obtain the adjusted charging current.

[0090] In the embodiments of the present application, it is determined whether the maximum temperature of the surface of the battery exceeds the temperature thermal runaway threshold value (which can also be referred to as the temperature safety threshold value), or whether the maximum temperature difference of the surface of the battery exceeds the temperature difference threshold value, and if so, the charging current is adjusted. It can be understood that the process of determining whether the battery to be charged has thermal runaway can also be realized by the following way: in the case where any of the temperature values is greater than the temperature thermal runaway threshold value, and the maximum temperature difference is greater than the temperature difference threshold value, it is determined that the battery to be charged has thermal runaway. By using the two parameters of temperature value and maximum temperature difference to determine whether thermal runaway occurs, the accuracy of the determination result is improved.

[0091] For example, when the temperature value detected by any temperature detection point on the surface of the battery is greater than the temperature thermal runaway threshold value, the charging current is adjusted so that the detected temperature value is less than the temperature thermal runaway threshold value. The difference between the maximum temperature value and the minimum temperature value in the plurality of temperature values on the surface of the battery is calculated, and when the difference exceeds the temperature difference threshold value, the charging current is adjusted so that the difference between the maximum temperature value and the minimum temperature value is less than the temperature difference threshold value.

[0092] ​S303, charge the battery to be charged according to the adjusted charging current.

[0093] In the embodiments of the present application, by acquiring the temperature distribution data of the surface of the battery, under the condition that the control temperature does not exceed the temperature thermal runaway threshold or the maximum temperature difference does not exceed the temperature difference threshold, the relationship between the charging current and the temperature during the charging process can be coordinated by adjusting the charging current, the safety of the charging process is improved while ensuring the charging rate. Further, the current not exceeding the temperature thermal runaway threshold can be used as the current limit, and the charging current can be more optimally selected to achieve battery cooling. The battery fast charging demand (for example, super fast charging) can be met, and the charging rate and battery safety are ensured. Compared with the current charging process of stopping charging at high temperature and then restarting charging, not only the charging time is shortened, but also the stability of the power is ensured, and the overall stability of the battery is improved.

[0094] It should be noted that after the above S101 is executed, at least one of the following judgment steps can be executed: judging whether any of the at least one pressure value of the target detection area is greater than the pressure threshold corresponding to the target detection area, judging whether any of the at least one pressure change rate of the target detection area is greater than the pressure change rate threshold corresponding to the target detection area, judging whether any temperature value is greater than the temperature thermal runaway threshold, and judging whether the difference between the maximum temperature value in the plurality of temperature values and the minimum temperature value in the plurality of temperature values is greater than the temperature difference threshold. In the case where any of the above judgment steps is satisfied, the charging current is adjusted, the battery to be charged is charged according to the adjusted charging current, and the safety during the charging process is improved. It can be understood that the charging current can also be adjusted in the case where two or more of the judgment steps are satisfied, further improving the accuracy of the judgment result and improving the charging efficiency.

[0095] In some embodiments, the present application also provides a charging adjustment method, as shown in Figure 10 .

[0096] S401, acquiring an initial remaining capacity of a battery to be charged and an initial temperature value of a surface of the battery to be charged.

[0097] S402, according to the initial remaining capacity and the initial temperature value, determining a target charging rate in a corresponding relationship between a preset temperature interval and a preset remaining capacity interval and a preset charging rate; the target charging rate is proportional to the charging current.

[0098] S403, charging the battery to be charged according to the target charging rate.

[0099] In this embodiment, when charging the battery to be charged begins, the initial SOC value and the initial surface temperature value of the battery to be charged are obtained. Based on the initial temperature value and the initial SOC value, charging is performed according to a preset charging strategy, that is, charging at a target charging rate. The preset charging strategy is a pre-stored battery charging rate corresponding to the current initial temperature value and initial SOC value.

[0100] Preset charging strategies can be obtained in advance based on experimental data. These strategies include charging rates under different preset temperature ranges and different State of Charge (SOC) ranges. For example... Figure 10 As shown, Figure 10 This is a schematic diagram illustrating the correspondence between temperature, remaining battery capacity, and charging rate provided in an embodiment of this application. When formulating a preset charging strategy, the preset temperature range can be between -20℃ and 55℃, and the SOC range can be between 0% and 99%. Thus, after detecting the temperature and SOC values ​​of the battery surface, based on... Figures 4-8 You can find the corresponding charging rate (i.e., the target charging rate) for initial charging.

[0101] S404. During the charging process of the battery to be charged according to the target charging rate, acquire the temperature distribution data of the surface of the battery to be charged, the pressure distribution data of the surface of the battery to be charged, and the remaining power of the battery to be charged.

[0102] S405. If it is determined from the temperature distribution data that the battery to be charged has a risk of thermal runaway, and / or if it is determined from the temperature distribution data, pressure distribution data and remaining charge that the battery to be charged is at the lithium plating boundary, the charging current is reduced to obtain the adjusted charging current.

[0103] S404 and S405 can be found above. Figure 11 The descriptions in the text regarding the risk of thermal runaway or the lithium plating boundary of the battery to be recharged will not be repeated here.

[0104] S406. If the temperature distribution data indicates that the battery to be charged is far from the risk of thermal runaway, and the temperature distribution data, pressure distribution data, and remaining charge indicate that the battery to be charged is far from the lithium plating boundary, the charging current is increased to obtain the adjusted charging current.

[0105] The battery theoretically corresponds to an ideal critical current at different temperature values, pressure values, and SOC value states. Based on this, the ideal critical current suitable for the current can be determined according to the temperature distribution data, the pressure distribution data, and the current SOC value of the battery surface, and the battery is charged using the ideal critical current, which can ensure the charging efficiency and reduce the occurrence of battery thermal runaway and battery lithium precipitation caused by excessive charging current, thereby slowing down the expansion process of the battery. Based on this, the charging current is increased to charge the battery to be charged close to the ideal critical current when it is detected that the battery to be charged is far away from the risk of thermal runaway and far away from the lithium precipitation boundary. For example, if the temperature value is much smaller than the temperature threshold value, and the maximum temperature difference (i.e., the difference between the maximum temperature value and the minimum temperature value in the plurality of temperature values) is much smaller than the temperature difference threshold value, it is determined that the battery to be charged is far away from the risk of thermal runaway, and the charging current can be appropriately increased. If the pressure value is much smaller than the corresponding pressure threshold value, and the pressure change rate is much smaller than the corresponding pressure change rate threshold value, it is determined that the battery to be charged is far away from the lithium precipitation boundary, and the charging current can be appropriately increased.

[0106] S407, charging the battery to be charged according to the adjusted charging current.

[0107] The method for automatically adjusting the charging current provided by the embodiments of the present application can dynamically adjust the current output charging current by acquiring the temperature distribution data, the pressure distribution data, and the real-time SOC value of the battery to be charged during charging, and according to the data mapping relationship between the temperature distribution data, the pressure distribution data, the SOC value, the risk of thermal runaway, and the lithium precipitation boundary. Thus, the current input charging current of the battery to be charged is the appropriate charging current under the current temperature distribution data, pressure distribution data, and SOC value of the battery to be charged, which can coordinate the temperature control and lithium precipitation problems during charging. The charging rate can be ensured, the risk of thermal runaway can be reduced, and the problem of battery lithium precipitation can be reduced during fast charging, thereby achieving the technical effect of speeding up the charging speed while ensuring the service life and safety of the battery.

[0108] S408, in the case where it is determined that the battery to be charged does not have the risk of thermal runaway according to the temperature distribution data, and the battery to be charged is not at the lithium precipitation boundary according to the temperature distribution data, the pressure distribution data, and the remaining capacity, the battery to be charged is continuously charged according to the target charging rate.

[0109] Generally, frequently increasing or decreasing the charging current during charging of the battery to be charged increases the algorithm power consumption and the control logic is complex. Basically, a charging rate (i.e., a target charging rate) is selected according to the initial SOC value and the initial temperature value at the beginning, which can achieve the purpose of fast charging. During the charging process, whether the battery to be charged is in thermal runaway and at the lithium precipitation boundary is determined according to the temperature distribution data, the pressure distribution data and the residual capacity. If the lithium precipitation boundary is not reached and the thermal runaway does not occur, the charging is performed at the target charging rate all the time. If the lithium precipitation boundary is reached or the thermal runaway occurs, the charging current is reduced.

[0110] It should be noted that after S404, S405 and S407 can be executed; S406 and S407 can be executed; or S408 can be executed. Any one of the following four conditions is met: any pressure value of any detection area is greater than the corresponding pressure threshold value, any pressure change rate of any detection area is greater than the corresponding pressure change rate threshold value, any temperature value is greater than the temperature thermal runaway threshold value, and any maximum temperature difference is greater than the temperature difference threshold value, that is, the charging current is reduced. The following four conditions are met: the pressure value of the detection area is much less than or equal to the corresponding pressure threshold value, the pressure change rate of the detection area is much less than or equal to the corresponding pressure change rate threshold value, the temperature value is much less than or equal to the temperature thermal runaway threshold value, and the maximum temperature difference is much less than or equal to the temperature difference threshold value, and the charging current can be increased. The pressure value of the detection area is less than or equal to the corresponding pressure threshold value, the pressure change rate of the detection area is less than or equal to the corresponding pressure change rate threshold value, the temperature value is less than or equal to the temperature thermal runaway threshold value, and the maximum temperature difference is less than or equal to the temperature difference threshold value, and the battery to be charged is charged at the target charging rate. In this way, the safety of the charging process is ensured and the battery life is prolonged.

[0111] The method for automatically adjusting the charging current provided by the embodiments of the present application realizes fast charging under the premise of ensuring the battery life and safety, reduces the charging time, and improves the charging rate.

[0112] Based on the charging adjustment method provided in the above embodiments, Figure 11 A structural schematic diagram of a charging adjustment device provided by the embodiments of the present application is shown in Figure 11 As shown, the charging adjustment device 110 includes a processor 1101, a memory 1102, and a computer program 1103 stored in the memory 1102 and executable on the processor 1101, and the processor 1101 implements the steps in the charging adjustment method in the above embodiments when executing the computer program 1103.

[0113] The charging adjustment apparatus 110 can be a general-purpose computer device or a special-purpose computer device. In specific implementations, the charging adjustment apparatus 110 can be a desktop computer, a laptop computer, a network server, a palmtop computer, a mobile phone, a tablet computer, a wireless terminal device, a communication device, or an embedded device, and the embodiments of the present application do not limit the type of the charging adjustment apparatus 110. Those skilled in the art can understand that Figure 12 The charging adjustment apparatus 110 is merely an example and does not constitute a limitation on the charging adjustment apparatus 110, and can include more or fewer components than shown, or combine certain components, or different components, such as an input / output device, a network access device, and the like.

[0114] The processor 1101 can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gates or transistor logic components, discrete hardware components, or the like. The general-purpose processor can be a microprocessor or can be any conventional processor.

[0115] The memory 1102 can be an internal memory unit of the charging adjustment apparatus 110, such as a hard disk or a memory of the charging adjustment apparatus 110, in some embodiments. The memory 1102 can also be an external storage device of the charging adjustment apparatus 110, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, or the like, in other embodiments. Further, the memory 1102 can include both an internal memory unit and an external storage device of the charging adjustment apparatus 110. The memory 1102 is used to store an operating system, application programs, a boot loader, data, and other programs, and the like. The memory 1102 can also be used to temporarily store data that has been output or will be output.

[0116] The embodiments of the present application also provide a charging adjustment apparatus, which includes at least one processor, a memory, and a computer program stored in the memory and executable on the at least one processor, and the processor implements the steps in any of the method embodiments described above when executing the computer program.

[0117] The charging adjustment device and the charging adjustment method provided in the above embodiments belong to the same concept. The specific working process and technical effects of the units and modules in the above embodiments can be found in the method embodiments section, and will not be repeated here.

[0118] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, can implement the steps in the various method embodiments described above.

[0119] This application provides a computer program product that, when run on a computer, causes the computer to perform the steps described in the various method embodiments above.

[0120] The charging method for adjusting the charging current provided in this application embodiment is used to dynamically control the charging current of the battery when charging the battery to be charged. This method can be executed by the charging adjustment device 110, or by the charging system of the charging equipment. The method can also be stored in a storage medium and implemented by software and / or hardware; this application embodiment does not impose any limitations on this.

[0121] Based on the aforementioned charging adjustment device 110, embodiments of this application also provide a power system. For example... Figure 12 As shown, Figure 1 This is a schematic diagram of a power system provided in an embodiment of this application. The power system 120 includes a battery to be recharged 1201, a temperature sensor 1202, a pressure sensor 1203, and a charging adjustment device 110. The charging adjustment device 110 is communicatively connected to the temperature sensor 1202 and the pressure sensor 1203. The temperature sensor 1202 is used to detect the temperature distribution data on the surface of the battery to be recharged 1201. The pressure sensor 1203 is used to detect the pressure distribution data on the surface of the battery to be recharged 1201. The charging adjustment device is used to obtain the remaining charge of the battery to be recharged 1201, and adjust the charging current according to the coupling relationship between the temperature distribution data, the pressure distribution data, the remaining charge, and the parameters of the battery to be recharged when thermal runaway or lithium plating occurs, to obtain the adjusted charging current. The battery to be recharged is charged according to the adjusted charging current.

[0122] In this example, the charging adjustment method is performed by the charging adjustment device 110, which can be a BMS. The settings of the pressure sensor 1203, temperature sensor 1202, and charging adjustment device 110 in the power system 120 can be found above. Figure 13 The description of energy storage devices in the text will not be repeated here.

[0123] The embodiment of the present application also provides a charging device, which is used for receiving temperature distribution data sent by a temperature sensor, pressure distribution data sent by a pressure sensor, and residual power sent by a power detection device during charging of a battery to be charged; adjusting a charging current according to the temperature distribution data, the pressure distribution data, the residual power, and a coupling relationship between parameters when the battery to be charged is in thermal runaway or lithium precipitation, obtaining an adjusted charging current; and charging the battery to be charged according to the adjusted charging current.

[0124] In the example, the charging device can be a charging pile or a charger. When the battery to be charged is charged by the charging pile, the charging adjustment method is executed by the charging pile to control the charging current, and when the battery to be charged is charged by the charger, the charging adjustment method is executed by the charger to control the charging current.

[0125] It should be noted that the charging adjustment device 110 can obtain the residual power of the battery to be charged, and based on this, the power detection device in the example can also be the charging adjustment device 110. The charging adjustment device 110 communicates with the charging device, and the charging adjustment device 110 is used to send the residual power to the charging device, and the charging adjustment method is executed by the charging device.

[0126] Based on the charging device provided above, the embodiment of the present application also provides a power system, as shown in Figure 13 ​ Another structure diagram of a power system provided by the embodiment of the present application. The power system 130 includes a battery to be charged 1301, a temperature sensor 1302, a pressure sensor 1303, a power detection device 1304, and a charging device 1305 as described above; the charging device 1305 is in communication connection with the temperature sensor 1302, the pressure sensor 1303, and the power detection device 1304 respectively; the temperature sensor 1302 is used to detect temperature distribution data of a surface of the battery to be charged 1301; the pressure sensor 1303 is used to detect pressure distribution data of the surface of the battery to be charged 1301; the power detection device 1304 is used to detect residual power of the battery to be charged 1301; the charging device 1305 is used to adjust a charging current according to the temperature distribution data, the pressure distribution data, the residual power, and a coupling relationship between parameters when the battery to be charged is in thermal runaway or lithium precipitation, obtain an adjusted charging current, and charge the battery to be charged according to the adjusted charging current.

[0127] ​The charging adjustment method is executed by the charging device 1305 (for example, a charger or a charging pile) in this example. The charging device 1305 has the function of charging different products (for example, new energy vehicles) of different models and different manufacturers. The charging adjustment method is integrated in the charging device 1305, and the charging device 1305 communicates with a sensor that collects parameters (temperature, pressure, and remaining power), or the charging device 1305 communicates with a management system of the battery 1301 to be charged, and the management system collects parameters (temperature, pressure, and remaining power) and then sends them to the charging device 1305. The charging adjustment method is uniformly executed by the charging device 1305, which improves the functionality of the charging device, does not need to integrate the implementation logic of the charging adjustment method on the product, and reduces the power consumption of the product.

[0128] If the integrated unit is implemented in the form of a software function unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such understanding, all or part of the processes in the above method embodiments can be instructed by a computer program to relevant hardware, and the computer program can be stored in a computer-readable storage medium. When the processor executes the computer program, the steps of each method embodiment described above can be implemented. The computer program includes computer program code, which can be in the form of source code, object code, an executable file, or some intermediate form. The computer-readable medium at least includes any entity or device capable of carrying the computer program code to the photographing device / terminal equipment, a recording medium, a computer memory, a ROM (Read-Only Memory), a RAM (Random Access Memory), a CD-ROM (Compact Disc Read-Only Memory), a magnetic tape, a floppy disk, and an optical data storage device. The computer-readable storage medium mentioned in the present application can be a non-volatile storage medium, in other words, a non-transitory storage medium.

[0129] It should be understood that all or part of the steps of the above-described embodiments can be implemented by software, hardware, firmware, or any combination thereof. When implemented by software, it can be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer instructions. The computer instructions can be stored in the computer-readable storage medium described above.

[0130] In the above embodiments, the description of each embodiment has its own focus, and the parts not described or recorded in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0131] Those skilled in the art can understand that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized in electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software manner depends on the specific application and design constraints of the technical solution. The skilled person can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0132] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalent replacements; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A charge adjustment method characterized by, The method comprises: obtaining temperature distribution data of a surface of the battery to be charged, pressure distribution data of the surface of the battery to be charged, and a remaining capacity of the battery to be charged during charging of the battery to be charged; in a case where it is determined according to the temperature distribution data that the battery to be charged has a risk of thermal runaway, and it is determined according to the temperature distribution data, the pressure distribution data, and the remaining capacity that the battery to be charged is at a lithium precipitation boundary, performing a reduction process on a charging current to obtain an adjusted charging current, wherein the temperature distribution data comprises a temperature value of each detection region in a plurality of detection regions on the surface of the battery to be charged; the pressure distribution data comprises at least one pressure value and at least one pressure change rate of each detection region; charging the battery to be charged according to the adjusted charging current; the determination according to the temperature distribution data, the pressure distribution data, and the remaining capacity that the battery to be charged is at a lithium precipitation boundary comprises: determining a pressure threshold value of a target detection region in a corresponding relationship between a preset temperature interval and a preset remaining capacity interval and a preset pressure threshold value according to a temperature value of the target detection region and a remaining capacity; the preset pressure threshold value indicates a pressure value corresponding to the start of lithium precipitation of the battery to be charged under the preset temperature interval and the preset remaining capacity interval; the target detection region is any detection region in the plurality of detection regions; determining a pressure change rate threshold value of the target detection region in a corresponding relationship between a preset temperature interval and a preset remaining capacity interval and a preset pressure change rate threshold value according to a temperature value of the target detection region and a remaining capacity; the preset pressure change rate threshold value indicates a pressure change rate corresponding to the start of lithium precipitation of the battery to be charged under the preset temperature interval and the preset remaining capacity interval; in a case where any pressure value of at least one pressure value of the target detection region is greater than the pressure threshold value, and any pressure change rate of at least one pressure change rate of the target detection region is greater than the pressure change rate threshold value, it is determined that the battery to be charged is at a lithium precipitation boundary.

2. The method of claim 1, wherein, the reduction process on the charging current to obtain the adjusted charging current comprises: multiplying the charging current by a preset coefficient to obtain the adjusted charging current, wherein the preset coefficient is less than 1; or, the difference between the charging current and a preset current is taken as the adjusted charging current.

3. The method of claim 1, wherein, after the reduction process on the charging current to obtain the adjusted charging current, the method further comprises: continuing to charge the battery to be charged according to the adjusted charging current, and obtaining new temperature distribution data, new pressure distribution data, and a new remaining capacity; In a case where it is determined according to the new temperature distribution data that the battery to be charged has a risk of thermal runaway, and / or it is determined according to the new temperature distribution data, the new pressure distribution data and the new remaining capacity that the battery to be charged is at a lithium precipitation boundary, the adjusted charging current continues to be reduced until the temperature distribution data and the pressure distribution data meet preset safety requirements.

4. The method according to any one of claims 1 to 3, characterized in that, The temperature distribution data includes temperature values of each of a plurality of detection regions on the surface of the battery to be charged. It is determined according to the temperature distribution data that the battery to be charged has a risk of thermal runaway, including: In a case where any of the plurality of temperature values is greater than a temperature threshold for thermal runaway, and / or a difference between a maximum temperature value of the plurality of temperature values and a minimum temperature value of the plurality of temperature values is greater than a temperature difference threshold, it is determined that the battery to be charged has a risk of thermal runaway.

5. The method according to any one of claims 1 to 3, wherein Before the temperature distribution data of the surface of the battery to be charged, the pressure distribution data of the surface of the battery to be charged and the remaining capacity of the battery to be charged are obtained during charging of the battery to be charged, the method further includes: An initial remaining capacity of the battery to be charged and an initial temperature value of the surface of the battery to be charged are obtained. According to the initial remaining capacity and the initial temperature value, a target charging rate is determined in a correspondence relationship between a preset temperature range and a preset remaining capacity range and a preset charging rate; the target charging rate is directly proportional to the charging current. The battery to be charged is charged according to the target charging rate.

6. The method of claim 5, wherein, According to the temperature distribution data, the pressure distribution data, the remaining capacity, and the coupling relationship between parameters when the battery to be charged has thermal runaway or lithium precipitation, the charging current is adjusted to obtain an adjusted charging current, including: In a case where it is determined according to the temperature distribution data that the battery to be charged is away from a risk of thermal runaway, and it is determined according to the temperature distribution data, the pressure distribution data and the remaining capacity that the battery to be charged is away from a lithium precipitation boundary, the charging current is increased to obtain the adjusted charging current.

7. The method of claim 5, wherein, After the temperature distribution data of the surface of the battery to be charged, the pressure distribution data of the surface of the battery to be charged and the remaining capacity of the battery to be charged are obtained during charging of the battery to be charged, the method further includes: In a case where it is determined according to the temperature distribution data that the battery to be charged is away from a risk of thermal runaway, and it is determined according to the temperature distribution data, the pressure distribution data and the remaining capacity that the battery to be charged is away from a lithium precipitation boundary, the charging current is increased to obtain the adjusted charging current.

8. A charge adjusting device, characterized by comprising: The charging adjustment device includes a memory, a processor and a computer program stored in the memory and executable on the processor, and the computer program is executed by the processor to implement the method of any one of claims 1-7.

9. A charging device, characterized by The charging device is used to implement the method of any one of claims 1-7.

10. A power system characterized by, The power system comprises a battery to be charged, a temperature sensor, a pressure sensor, and the charging adjustment device according to claim 8; the charging adjustment device is in communication connection with the temperature sensor and the pressure sensor, respectively; The temperature sensor is configured to detect temperature distribution data of a surface of the battery to be charged; The pressure sensor is configured to detect pressure distribution data of the surface of the battery to be charged; The charging adjustment device is configured to acquire a remaining capacity of the battery to be charged, and adjust a charging current according to the temperature distribution data, the pressure distribution data, the remaining capacity, and a coupling relationship between parameters when thermal runaway or lithium precipitation occurs in the battery to be charged, to obtain an adjusted charging current; and charge the battery to be charged according to the adjusted charging current.

11. A power system characterized by, The power system comprises a battery to be charged, a temperature sensor, a pressure sensor, an electric quantity detection device, and the charging device according to claim 9; the charging device is in communication connection with the temperature sensor, the pressure sensor, and the electric quantity detection device, respectively; The temperature sensor is configured to detect temperature distribution data of a surface of the battery to be charged; The pressure sensor is configured to detect pressure distribution data of the surface of the battery to be charged; The electric quantity detection device is configured to detect a remaining capacity of the battery to be charged; The charging device is configured to adjust a charging current according to the temperature distribution data, the pressure distribution data, the remaining capacity, and a coupling relationship between parameters when thermal runaway or lithium precipitation occurs in the battery to be charged, to obtain an adjusted charging current; and charge the battery to be charged according to the adjusted charging current.

12. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, and the computer program is executed by the processor to implement the method according to any one of claims 1-7.

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