Charging control method and device, electronic equipment and vehicle

Abstract

The invention discloses a charging control method and device, electronic equipment and a vehicle, and relates to the technical field of battery management. The method comprises the following steps: in a charging process, acquiring temperature characteristic values corresponding to a plurality of acquisition points in a battery pack; in combination with the temperature characteristic values corresponding to the plurality of acquisition points, determining expansive forces corresponding to the plurality of acquisition points through a pre-established expansive force and temperature relation curve; and carrying out lithium precipitation detection on the preset area based on the expansive forces corresponding to the plurality of acquisition points, and carrying out corresponding charging control. Compared with the prior art, the method has the advantages that the temperature characteristic values of the different acquisition points are acquired on the basis of the cell charging strategy, the expansibility corresponding to the different acquisition points is determined through the pre-established expansibility and temperature relation curve, and the charging strategy is logically adjusted by monitoring the expansibility, so that the charging current is more accurately controlled, and the charging efficiency is improved. The problem that the service life of the battery is affected due to the fact that the charging current cannot be accurately controlled due to the factor of expansive force in an existing charging strategy is solved.

Description

Technical Field

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

[0002] At present, the battery will generate expansion force during the charging process, and the temperature will affect the expansion force in the battery, thereby indirectly affecting the battery life. Specifically, the expansion force is proportional to the temperature. A large expansion force will cause the middle of the battery cell to "swell". After the swelling is squeezed by the shell, it will affect the electrolyte reflux and easily cause the cycle to plunge due to lack of electrolyte. Therefore, in the current charging strategy, there is a problem that the charging current cannot be accurately controlled due to the expansion force generated by temperature, which affects the battery life. Summary of the invention

[0003] In view of this, the present application provides a charging control method, device, electronic device and vehicle, which can solve the problem that the current charging strategy cannot accurately control the charging current due to the expansion force factor, thereby affecting the service life of the battery.

[0004] In a first aspect, the present application provides a charging control method, comprising:

[0005] During the charging process, temperature characteristic values ​​corresponding to multiple collection points in the battery pack are collected; wherein the batteries in the battery pack are evenly divided into multiple preset areas, and the center of each preset area corresponds to a collection point;

[0006] In combination with the temperature characteristic values ​​corresponding to the multiple collection points, the expansion forces corresponding to the multiple collection points are determined by using a pre-established expansion force and temperature relationship curve;

[0007] Based on the expansion forces corresponding to the multiple collection points, lithium deposition detection is performed on the preset area, and corresponding charging control is performed.

[0008] Optionally, the temperature characteristic value includes a maximum temperature;

[0009] The step of combining the temperature characteristic values ​​corresponding to the multiple collection points and determining the expansion forces corresponding to the multiple collection points through a pre-established expansion force and temperature relationship curve includes:

[0010] The maximum temperature values ​​corresponding to the multiple collection points are respectively input into the expansion force and temperature relationship curve to obtain the expansion forces corresponding to the multiple collection points.

[0011] Optionally, the process of obtaining the expansion force and temperature relationship curve includes:

[0012] Complete a preset number of charging cycles for a single battery cell, and record the expansion force data and temperature data during each charging cycle;

[0013] The expansion force data and the temperature data are input into a conversion model to obtain a curve of the relationship between the expansion force and the temperature.

[0014] Optionally, based on the expansion forces corresponding to the multiple collection points, lithium deposition detection is performed on a preset area, and corresponding charging control is performed, including:

[0015] Comparing the expansion forces corresponding to the multiple acquisition points with preset expansion force thresholds respectively;

[0016] When there is an expansion force corresponding to a target collection point that is greater than the preset expansion force threshold, it is determined that there is an abnormality at the target collection point;

[0017] Lithium deposition detection is performed on a preset area corresponding to the target collection point and corresponding charging control is performed.

[0018] Optionally, performing lithium deposition detection on a preset area corresponding to the target collection point and performing corresponding charging control includes:

[0019] Performing lithium deposition detection on the preset area corresponding to the target collection point to determine whether a lithium deposition signal appears;

[0020] If a lithium deposition signal is found after the lithium deposition detection, a deactivation and repair alarm is issued;

[0021] If there is no lithium deposition signal after the lithium deposition detection, the charging current is reduced and the water cooling power is increased.

[0022] Optionally, the temperature characteristic value includes a temperature minimum value;

[0023] The step of reducing the charging current and increasing the water cooling power includes:

[0024] Obtaining a target charging current value and a target water cooling power corresponding to the minimum temperature value;

[0025] The charging power is reduced to the target charging current value, and the water cooling power is increased to the target water cooling power.

[0026] Optionally, after reducing the charging current and increasing the water cooling power, the method further includes:

[0027] Collecting temperature characteristic values ​​corresponding to the plurality of collection points, and determining expansion forces corresponding to the plurality of collection points;

[0028] Determining whether the expansion forces corresponding to the multiple collection points are all less than or equal to the preset expansion force threshold;

[0029] In the case where the expansion force corresponding to a collection point is greater than the preset expansion force threshold, the charging current is reduced and the water cooling power is increased based on the expansion force corresponding to the collection point until the expansion forces corresponding to the multiple collection points are less than or equal to the preset expansion force threshold.

[0030] In a second aspect, the present application provides a charging control device, comprising:

[0031] A collection unit is configured to collect temperature characteristic values ​​corresponding to a plurality of collection points in a battery pack during charging; wherein the batteries in the battery pack are evenly divided into a plurality of preset areas, and the center of each of the preset areas corresponds to a collection point;

[0032] a calculation unit configured to determine the expansion forces corresponding to the plurality of collection points by combining the temperature characteristic values ​​corresponding to the plurality of collection points and by using a pre-established expansion force and temperature relationship curve;

[0033] The processing unit is configured to perform lithium deposition detection on a preset area based on the expansion forces corresponding to the multiple collection points, and perform corresponding charging control.

[0034] In a third aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the charging control method described in the first aspect is implemented.

[0035] In a fourth aspect, the present application provides an electronic device, comprising a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, wherein the processor implements the charging control method described in the first aspect when executing the computer program.

[0036] In a fifth aspect, the present application provides a vehicle, comprising: the device as described in the second aspect, or the electronic device as described in the fourth aspect.

[0037] By means of the above technical scheme, the present application provides a charging control method, which first collects temperature characteristic values ​​corresponding to multiple collection points in a battery pack during the charging process. The battery pack is evenly divided into multiple preset areas according to the distribution of the batteries, and the collection point is set at the center of each preset area. Then, the temperature characteristic values ​​corresponding to the multiple collection points are combined and the expansion force corresponding to each collection point is determined through a pre-established expansion force and temperature relationship curve, and charging control is performed based on the expansion force of each collection point. Compared with the related art, the temperature characteristic values ​​of different collection points are obtained and the expansion force is determined on the basis of the existing charging strategy of the battery cell. The charging strategy is logically adjusted by monitoring the expansion force, so that the control of the charging current is more precise, which solves the problem that the charging current cannot be accurately controlled due to the expansion force factor in the current charging strategy, and improves the service life of the battery.

[0038] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. 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 application and, together with the description, serve to explain the principles of the present application.

[0040] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0041] Figure 1 A schematic diagram of a charging control method provided in an embodiment of the present application is shown;

[0042] Figure 2 A schematic diagram showing a curve of the relationship between the performance of a battery cell and the number of cycles provided in an embodiment of the present application is shown;

[0043] Figure 3 A schematic diagram showing a curve of the relationship between the expansion force of a battery cell and the number of cycles provided in an embodiment of the present application is shown;

[0044] Figure 4 A schematic diagram showing a curve of the relationship between the expansion force and temperature of a battery cell provided in an embodiment of the present application;

[0045] Figure 5 A schematic diagram showing a flow chart of another charging control method provided in an embodiment of the present application is shown;

[0046] Figure 6 A schematic structural diagram of a charging control device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0047] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0048] In order to solve the problem that the current charging strategy cannot accurately control the charging current due to the expansion force factor, which affects the battery life, and thus improve the battery life, this embodiment proposes a charging control method. Figure 1 As shown, the method includes:

[0049] S101, during the charging process, collecting temperature characteristic values ​​corresponding to multiple collection points in the battery pack.

[0050] During the charging process of the battery pack, the temperature characteristic values ​​corresponding to multiple collection points in the battery pack are collected by temperature sensors and other devices. The temperature sensor can preferably be a power thermistor (Negative Temperature Coefficient, NTC). The batteries in the battery pack are evenly divided into multiple preset areas, and the center of each preset area corresponds to a collection point. The division process of this area is generally divided into equal parts according to the number of batteries when the battery pack leaves the factory, or it can be evenly divided according to the battery distribution.

[0051] S102, combining the temperature characteristic values ​​corresponding to the multiple collection points, and determining the expansion forces corresponding to the multiple collection points through a pre-established expansion force and temperature relationship curve.

[0052] The temperature characteristic values ​​collected at multiple collection points are used to determine the battery expansion force corresponding to each collection point based on the pre-established expansion force and temperature relationship curve. The expansion force refers to the force exerted on the fixture when the battery cell contacts the fixture during charging. This force is called the expansion force.

[0053] S103, performing lithium deposition detection on a preset area based on the expansion forces corresponding to the multiple collection points, and performing corresponding charging control.

[0054] The charging is controlled by the battery expansion force corresponding to each collection point. The charging control here refers to the adjustment of the charging strategy, that is, the performance parameter table based on the battery charging process, including temperature adjustment, voltage range adjustment, etc. The specific actual operation may include lithium plating detection in the preset area, charging current adjustment and water cooling power adjustment.

[0055] In the related art, the battery will generate expansion force during the charging process, and the temperature will affect the expansion force in the battery, thereby indirectly affecting the battery life. Specifically, the expansion force is proportional to the temperature. A large expansion force will cause the middle part of the battery cell to "bulge". After the bulge, it will be squeezed by the shell, which will affect the reflux of the electrolyte and easily cause the cycle to plunge due to lack of liquid, thus affecting the service life of the battery. On the other hand, due to the different heat accumulation and diffusion at different positions of the single battery cells in the battery pack, the temperature of each single battery cell is quite different, which leads to different expansion forces of the battery cells at different positions, resulting in different degrees of lithium precipitation / plunging in the later stage of the cycle, which will also affect the battery life.

[0056] In this embodiment, first, during the charging process, the temperature characteristic values ​​corresponding to multiple collection points in the battery pack are collected. Among them, the battery pack will be evenly divided into multiple preset areas according to the distribution of batteries, and the collection point is set at the center of each preset area. Then, combined with the temperature characteristic values ​​corresponding to the multiple collection points, the expansion force corresponding to each collection point is determined by a pre-established expansion force and temperature relationship curve, and charging control is performed based on the expansion force of each collection point. Compared with the related art, the temperature characteristic values ​​of different collection points are obtained and the expansion force is determined on the basis of the existing charging strategy of the battery cell. The charging strategy is logically adjusted by monitoring the expansion force, so that the control of the charging current is more precise, which solves the problem that the current charging strategy cannot accurately control the charging current due to the expansion force factor, affecting the service life of the battery.

[0057] like Figure 2 , showing a schematic diagram of the relationship curve between the battery cell performance and the number of cycles provided in an embodiment of the present application. The dotted line represents the ideal situation of the battery cell cycle performance, and the solid line represents the actual situation of the battery cell cycle performance. It can be seen that as the number of charging cycles increases, the battery capacity will decrease from 100% to 80%, which is consistent with the above-mentioned conclusion that the expansion force will affect the battery capacity. At the same time, the gap between the solid line and the dotted line is due to the relationship between the battery expansion force and the battery temperature rise, which affects the battery capacity and causes a decrease in battery life. Furthermore, as the number of cycles increases, the expansion force will increase in advance, such as Figure 3 , which is a schematic diagram showing the relationship curve between the expansion force of the battery cell and the number of cycles provided in an embodiment of the present application. The dotted line should be the change in the expansion force of the battery under ideal conditions, but in actual processes, it has risen to a higher state when the number of cycles has not reached the ideal condition.

[0058] Optionally, the temperature characteristic value includes a maximum temperature; combining the temperature characteristic values ​​corresponding to the multiple collection points, determining the expansion forces corresponding to the multiple collection points through a pre-established expansion force and temperature relationship curve, including: inputting the maximum temperature values ​​corresponding to the multiple collection points into the expansion force and temperature relationship curve respectively, to obtain the expansion forces corresponding to the multiple collection points.

[0059] In this embodiment, the expansion force corresponding to each collection point is determined by a pre-established expansion force and temperature relationship curve. According to the maximum temperature combined with the expansion force and temperature relationship curve, the expansion force corresponding to multiple collection points can be determined, so that the relationship between the expansion force and the temperature can be visualized, and the performance guarantee of the battery cell throughout its life cycle can be achieved.

[0060] Furthermore, the process of obtaining the expansion force and temperature relationship curve includes: completing a preset number of charging cycles for a single battery cell, recording the expansion force data and temperature data during each charging cycle; inputting the expansion force data and temperature data into a conversion model to obtain the expansion force and temperature relationship curve.

[0061] In this embodiment, the process of obtaining the expansion force and temperature relationship curve is described. A single battery cell is charged for a preset number of times in advance, and the expansion force data and temperature data during each charging cycle are recorded. The preset number of times is preferably in the range of 800 to 1200 times, and can also be selected according to specific circumstances. Then, the expansion force data and temperature data are input into the conversion model for algorithm recognition, and the expansion force and temperature relationship curve can be obtained. Figure 4 , showing a schematic diagram of the relationship curve between the expansion force and temperature of the battery cell provided in an embodiment of the present application. In the figure, the horizontal axis SOC represents the state of charge, also called the remaining power, which represents the ratio of the remaining capacity of the battery after a period of use or long-term unused to its capacity in a fully charged state. As can be seen from the figure, generally when the battery is charged to 40%-80% of the capacity, the battery temperature and the expansion force will gradually increase, which is also the reason why the battery is prone to failure. Therefore, it is necessary to combine the following Figure 4 The relationship curve shown monitors the expansion force and temperature in time, so as to adjust the charging strategy and water cooling strategy in time. It should be noted that in order to avoid errors, multiple cells can also be charged for a preset number of cycles, and then the obtained data can be averaged and input into the conversion model to obtain the expansion force and temperature relationship curve. This can make the obtained expansion force and temperature relationship curve more accurate.

[0062] Optionally, based on the expansion forces corresponding to the multiple collection points, a preset area is detected for lithium deposition, and corresponding charging control is performed, including: comparing the expansion forces corresponding to the multiple collection points with preset expansion force thresholds respectively; when there is an expansion force corresponding to a target collection point that is greater than the preset expansion force threshold, determining that the target collection point is abnormal; and a preset area corresponding to the target collection point is detected for lithium deposition and corresponding charging control is performed.

[0063] In this embodiment, the charging control step may include comparing the expansion force of each collection point with a preset expansion force threshold. If the expansion force of a collection point is greater than the preset expansion force threshold, it is determined that the collection point is abnormal, and the collection point is used as a target collection point, and then a lithium deposition detection is required for the preset area corresponding to the target collection point. By setting a preset expansion force threshold, it is determined which areas have too high expansion forces and therefore may have a risk of lithium deposition, and then these areas are detected and charged, so as to determine whether the battery cells in the area have a risk of lithium deposition / water diving.

[0064] Optionally, a lithium deposition detection is performed on a preset area corresponding to the target collection point and corresponding charging control is performed, including: performing a lithium deposition detection on the preset area corresponding to the target collection point to determine whether a lithium deposition signal appears; if a lithium deposition signal exists after the lithium deposition detection, issuing a deactivation and repair alarm; if there is no lithium deposition signal after the lithium deposition detection, reducing the charging current and increasing the water cooling power.

[0065] In this embodiment, after the lithium deposition test, if there is a lithium deposition signal after the lithium deposition test, a deactivation and repair alarm is issued; if there is no lithium deposition signal after the lithium deposition test, the charging current is reduced and the water cooling power is increased. In areas where the expansion force is large but there is no lithium deposition, it is necessary to timely adjust the charging strategy and water cooling strategy to reduce the temperature rise of the battery cell.

[0066] In the above embodiment, the temperature characteristic value includes a minimum temperature value; reducing the charging current and increasing the water cooling power, including: obtaining a target charging current value and a target water cooling power corresponding to the minimum temperature value; reducing the charging power to the target charging current value, and increasing the water cooling power to the target water cooling power.

[0067] In this embodiment, the temperature characteristic value also includes a minimum temperature value, and the step of reducing the charging current and increasing the water cooling power may include determining a target charging current value and a target water cooling power corresponding to the minimum temperature value, reducing the charging power and increasing the water cooling power. In an area where the expansion force is large but there is no lithium deposition, it is necessary to reduce the current and increase the water cooling power in a timely manner to reduce the temperature rise of the battery cell.

[0068] Optionally, after reducing the charging current and increasing the water cooling power, the method further includes: collecting temperature characteristic values ​​corresponding to multiple collection points, and determining the expansion forces corresponding to the multiple collection points; judging whether the expansion forces corresponding to the multiple collection points are all less than or equal to a preset expansion force threshold; in the event that the expansion force corresponding to a collection point is greater than the preset expansion force threshold, reducing the charging current and increasing the water cooling power based on the expansion force corresponding to the collection point, until the expansion forces corresponding to the multiple collection points are less than or equal to the preset expansion force threshold.

[0069] In this embodiment, after the charging current is reduced and the water cooling power is increased, it is also re-determined whether the expansion force is less than or equal to the expansion force threshold. If there are still collection points greater than the expansion force threshold, the charging strategy and the water cooling strategy are adjusted according to the method mentioned in the above embodiment, that is, the dynamic control of the charging strategy is maintained throughout the charging process to solve the problem that the charging current cannot be accurately controlled due to the expansion force factor in the current charging strategy, thereby improving the battery life.

[0070] like Figure 5 FIG. 2 is a flow chart of another charging control method provided by an embodiment of the present application. The method includes:

[0071] S501, obtaining a curve of relationship between expansion force and temperature.

[0072] By charging a single battery cell for a preset number of times and recording the expansion force data and temperature data during each charging cycle, the expansion force data and temperature data can be input into the conversion model for algorithm recognition to obtain the expansion force and temperature relationship curve.

[0073] S502, during the charging process, collecting the maximum temperature and the minimum temperature corresponding to multiple collection points in the battery pack.

[0074] The maximum temperature value can be used to input into the expansion force and temperature relationship curve to obtain the corresponding battery expansion force, and the minimum temperature value can be used to reduce the charging current. Both the maximum temperature value and the minimum temperature value belong to temperature characteristic values.

[0075] S503, inputting the maximum temperature values ​​corresponding to the multiple collection points into the expansion force and temperature relationship curve respectively to obtain the expansion forces corresponding to the multiple collection points.

[0076] S504, determine whether there is a target acquisition point corresponding to an expansion force greater than a preset expansion force threshold. If not, proceed to S5051; if so, proceed to S5052.

[0077] The preset expansion force threshold may be set according to actual application or human experience, or may adopt a safe expansion force threshold given in a curve of the relationship between expansion force and temperature.

[0078] S5051, charging strategy remains unchanged.

[0079] S5052, perform lithium deposition detection on the preset area corresponding to the target collection point to determine whether a lithium deposition signal appears. If so, proceed to S5061; if not, proceed to S5062.

[0080] S5061, deactivate and return for repair.

[0081] S5062, reducing the charging current and increasing the water cooling power.

[0082] To reduce the charging current, the corresponding target charging current value and target water cooling power can be determined by the minimum temperature value. Then the charging power can be reduced and the water cooling power can be increased. In areas where the expansion force is large but there is no lithium deposition, it is necessary to reduce the current and increase the water cooling power in time to reduce the temperature rise of the battery cell.

[0083] S507, collecting new temperature characteristic values ​​of multiple collection points and calculating the expansion forces corresponding to the multiple collection points.

[0084] S508, determining whether the expansion forces corresponding to the multiple acquisition points are all less than or equal to the preset expansion force threshold. If yes, then end; if no, then return to S5062 until the expansion forces corresponding to the multiple acquisition points are all less than or equal to the preset expansion force threshold.

[0085] In this embodiment, the temperature is sampled by temperature sensors in different partitions of the battery pack to output the maximum and minimum temperature values, and the temperature data is then input into a curve model of the relationship between expansion force and temperature to obtain the expansion force. The change trend of the expansion force is monitored to determine whether the battery cell has a risk of lithium plating / water diving, and the charging and water cooling strategies are adjusted at the same time to make the control of the charging current more precise, thereby solving the problem that the current charging strategy cannot accurately control the charging current due to the expansion force factor, thereby affecting the battery life.

[0086] Further, as Figures 1 to 5 The specific implementation of the method shown in the embodiment provides a charging control device, such as Figure 6 As shown, the device includes: a collection unit 601, a calculation unit 602 and a processing unit 603.

[0087] The collection unit 601 is configured to collect temperature characteristic values ​​corresponding to multiple collection points in the battery pack during the charging process; wherein the batteries in the battery pack are evenly divided into multiple preset areas, and the center of each preset area corresponds to a collection point;

[0088] The calculation unit 602 is configured to determine the expansion forces corresponding to the plurality of collection points by combining the temperature characteristic values ​​corresponding to the plurality of collection points through a pre-established expansion force and temperature relationship curve;

[0089] The processing unit 603 is configured to perform lithium deposition detection on a preset area based on the expansion forces corresponding to the multiple collection points, and perform corresponding charging control.

[0090] In a specific application scenario, the calculation unit 602 is specifically configured to input the maximum temperature values ​​corresponding to the multiple collection points into the expansion force and temperature relationship curve respectively to obtain the expansion forces corresponding to the multiple collection points.

[0091] In a specific application scenario, the calculation unit 602 is further configured to complete a preset number of charging cycles for a single battery cell, record the expansion force data and the temperature data during each charging cycle; input the expansion force data and the temperature data into a conversion model to obtain the expansion force and temperature relationship curve.

[0092] In a specific application scenario, the processing unit 603 is further configured to compare the expansion forces corresponding to the multiple collection points with preset expansion force thresholds respectively; when there is an expansion force corresponding to a target collection point that is greater than the preset expansion force threshold, determine that there is an abnormality in the target collection point; perform lithium plating detection on a preset area corresponding to the target collection point and perform corresponding charging control.

[0093] In a specific application scenario, the processing unit 603 is further configured to perform lithium deposition detection on a preset area corresponding to the target collection point to determine whether a lithium deposition signal appears; if a lithium deposition signal exists after the lithium deposition detection, a deactivation and repair alarm is issued; if there is no lithium deposition signal after the lithium deposition detection, the charging current is reduced and the water cooling power is increased.

[0094] In a specific application scenario, the processing unit 603 is further configured to obtain a target charging current value and a target water cooling power corresponding to the minimum temperature value; reduce the charging power to the target charging current value, and increase the water cooling power to the target water cooling power.

[0095] In a specific application scenario, the processing unit 603 is further configured to collect temperature characteristic values ​​corresponding to the multiple collection points, and determine the expansion forces corresponding to the multiple collection points; determine whether the expansion forces corresponding to the multiple collection points are all less than or equal to the preset expansion force threshold; in the case that the expansion force corresponding to a collection point is greater than the preset expansion force threshold, reduce the charging current and increase the water cooling power based on the expansion force corresponding to the collection point until the expansion force corresponding to the multiple collection points is less than or equal to the preset expansion force threshold.

[0096] It should be noted that for other corresponding descriptions of the functional units involved in the charging control device provided in this embodiment, reference can be made to Figures 1 to 5 The corresponding description in will not be repeated here.

[0097] Based on the above Figures 1 to 5 The method shown in the embodiment also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the above-mentioned Figures 1 to 5 The method shown.

[0098] Based on this understanding, the technical solution of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, USB flash drive, mobile hard disk, etc.), including a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods of various implementation scenarios of the present application.

[0099] Based on the above Figures 1 to 5 The method shown, and Figure 6 In order to achieve the above-mentioned purpose, the embodiment of the present application further provides an electronic device, which can be configured on a computer side or a vehicle side, etc. The device includes a storage medium and a processor; the storage medium is used to store a computer program; the processor is used to execute the computer program to achieve the above-mentioned Figures 1 to 5 The method shown.

[0100] Optionally, the above-mentioned physical device may also include a user interface, a network interface, a camera, a radio frequency (RF) circuit, a sensor, an audio circuit, a WI-FI module, etc. The user interface may include a display, an input unit such as a keyboard, etc., and the optional user interface may also include a USB interface, a card reader interface, etc. The network interface may optionally include a standard wired interface, a wireless interface (such as a WI-FI interface), etc.

[0101] Those skilled in the art will appreciate that the above-mentioned physical device structure provided in this embodiment does not constitute a limitation on the physical device, and may include more or fewer components, or a combination of certain components, or different arrangements of components.

[0102] The storage medium may also include an operating system and a network communication module. The operating system is a program that manages the hardware and software resources of the above-mentioned physical device, and supports the operation of the information processing program and other software and / or programs. The network communication module is used to realize the communication between the components inside the storage medium, and the communication with other hardware and software in the information processing physical device.

[0103] Based on the above electronic device, the embodiment of the present application further provides a vehicle, which may specifically include: Figure 6 The device shown in the figure or the electronic device as described above. The vehicle can be a new energy vehicle or a traditional vehicle.

[0104] Through the description of the above implementation methods, those skilled in the art can clearly understand that the present application can be implemented by means of software plus a necessary general hardware platform, or by hardware. By applying the solution of this embodiment, compared with the related art, the temperature characteristic values ​​of different collection points are obtained and the expansion force is determined based on the existing charging strategy of the battery cell. The charging strategy is logically adjusted by monitoring the expansion force, so that the control of the charging current is more accurate, which solves the problem that the current charging strategy cannot accurately control the charging current due to the expansion force factor, affecting the service life of the battery.

[0105] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0106] The above is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features applied for herein.

Claims

1. A charging control method, characterized in that: include: During the charging process, temperature characteristic values ​​corresponding to multiple collection points in the battery pack are collected; wherein the batteries in the battery pack are evenly divided into multiple preset areas, and the center of each preset area corresponds to a collection point; In combination with the temperature characteristic values ​​corresponding to the multiple collection points, the expansion forces corresponding to the multiple collection points are determined by using a pre-established expansion force and temperature relationship curve; Based on the expansion forces corresponding to the multiple collection points, lithium deposition detection is performed on the preset area, and corresponding charging control is performed.

2. The method according to claim 1, characterized in that The temperature characteristic value includes a maximum temperature; The step of combining the temperature characteristic values ​​corresponding to the multiple collection points and determining the expansion forces corresponding to the multiple collection points through a pre-established expansion force and temperature relationship curve includes: The maximum temperature values ​​corresponding to the multiple collection points are respectively input into the expansion force and temperature relationship curve to obtain the expansion forces corresponding to the multiple collection points.

3. The method according to claim 1 or 2, characterized in that: The process of obtaining the expansion force and temperature relationship curve includes: Complete a preset number of charging cycles for a single battery cell, and record the expansion force data and temperature data during each charging cycle; The expansion force data and the temperature data are input into a conversion model to obtain a curve of the relationship between the expansion force and the temperature.

4. The method according to claim 1, characterized in that: The method of performing lithium deposition detection on a preset area based on the expansion forces corresponding to the multiple collection points and performing corresponding charging control includes: Comparing the expansion forces corresponding to the multiple acquisition points with preset expansion force thresholds respectively; When there is an expansion force corresponding to a target collection point that is greater than the preset expansion force threshold, it is determined that there is an abnormality at the target collection point; Lithium deposition detection is performed on a preset area corresponding to the target collection point, and corresponding charging control is performed.

5. The method according to claim 4, characterized in that Performing lithium deposition detection on a preset area corresponding to the target collection point and performing corresponding charging control, including: Performing lithium deposition detection on the preset area corresponding to the target collection point to determine whether a lithium deposition signal appears; If a lithium deposition signal is found after the lithium deposition detection, a deactivation and repair alarm is issued; If there is no lithium deposition signal after the lithium deposition detection, the charging current is reduced and the water cooling power is increased.

6. The method according to claim 5, characterized in that The temperature characteristic value includes a minimum temperature value; The step of reducing the charging current and increasing the water cooling power comprises: Obtaining a target charging current value and a target water cooling power corresponding to the minimum temperature; The charging power is reduced to the target charging current value, and the water cooling power is increased to the target water cooling power.

7. The method according to claim 6, characterized in that After reducing the charging current and increasing the water cooling power, the method further includes: Collecting temperature characteristic values ​​corresponding to the plurality of collection points, and determining expansion forces corresponding to the plurality of collection points; Determining whether the expansion forces corresponding to the multiple collection points are all less than or equal to the preset expansion force threshold; In the case where the expansion force corresponding to a collection point is greater than the preset expansion force threshold, the charging current is reduced and the water cooling power is increased based on the expansion force corresponding to the collection point until the expansion forces corresponding to the multiple collection points are less than or equal to the preset expansion force threshold.

8. A charging control device, characterized in that: include: A collection unit is configured to collect temperature characteristic values ​​corresponding to a plurality of collection points in a battery pack during charging; wherein the batteries in the battery pack are evenly divided into a plurality of preset areas, and the center of each of the preset areas corresponds to a collection point; a calculation unit configured to determine the expansion forces corresponding to the plurality of collection points by combining the temperature characteristic values ​​corresponding to the plurality of collection points and by using a pre-established expansion force and temperature relationship curve; The processing unit is configured to perform lithium deposition detection on a preset area based on the expansion forces corresponding to the multiple collection points, and perform corresponding charging control.

9. An electronic device comprising a storage medium, a processor, and a computer program stored in the storage medium and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

11. A vehicle, characterized in that: include: The device as claimed in claim 8, or the electronic device as claimed in claim 10.

Images