Charging health management method and system for vehicle lithium battery and charging equipment

Abstract

The invention belongs to the technical field of lithium battery health management, and provides a charging health management method and system for a vehicle lithium battery and charging equipment, and the method comprises the steps: determining the internal temperature of a battery pack and the internal temperature rise rate of the battery pack through a three-dimensional thermal imaging technology, and if the detected environment temperature is higher than a preset value, stopping the charging of the vehicle lithium battery; a preset battery pack protection bottom plate cooling strategy is used for cooling the battery pack protection bottom plate, and the situation that the judgment precision of the thermal imaging technology on the battery temperature is affected due to the fact that the temperature of the protection bottom plate is too high is avoided; meanwhile, if the internal temperature of the battery pack exceeds a preset temperature value or the temperature rise rate exceeds a preset rate value, charging health management is carried out by utilizing preset charging management, and natural problems of the battery pack caused by too high temperature are avoided by judging the internal temperature and the temperature rise rate of the battery pack; meanwhile, the problem that the charging time is prolonged when the temperature of the battery pack is excessively reduced is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of lithium battery health management, and in particular relates to a charging health management method, system and charging equipment for a vehicle lithium battery. Background Art

[0002] The current charging pile cannot effectively read the internal temperature data of the battery pack (PACK), and the battery thermal runaway process that may occur during the charging process cannot be grasped. The traditional battery management system can further obtain the external temperature of multiple areas of the battery when the internal temperature of the battery is detected to be abnormal, and reduce the battery temperature when there is a target area with abnormal external temperature in multiple areas.

[0003] The inventors have found that when a vehicle is charging, the selected charging piles are generally random in terms of area, and the vehicle cannot communicate with all charging piles, and thus cannot provide a temperature basis for charging health management through the temperature sensors installed inside the vehicle. When the battery pack temperature is judged at the charging piles and other places using technologies such as thermal imaging, the temperature of the bottom plate of the battery pack is often relatively high due to factors such as the external environment, which affects the thermal imaging technology's judgment of the battery temperature, resulting in a phenomenon where the measured temperature value is higher than the actual temperature of the battery pack, leading to management errors. Furthermore, the battery temperature will directly affect the charging rate. For example, if the battery is charged at a low temperature, a longer charging time will be required. A high temperature of the battery pack can shorten the entire charging time, but an excessively high temperature can easily cause natural problems in the battery pack. The current battery management system cannot solve the contradiction between shortening the charging time and reducing natural risks. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a charging health management method, system and charging equipment for automotive lithium batteries. The present invention uses three-dimensional thermal imaging technology to determine the internal temperature of the battery pack and the heating rate inside the battery pack. At the same time, if the detected ambient temperature is higher than the preset value, the preset battery pack bottom plate cooling strategy is used to cool the battery pack bottom plate, thereby avoiding the bottom plate temperature being too high and affecting the accuracy of thermal imaging technology in judging the battery temperature; at the same time, if the internal temperature of the battery pack exceeds the preset temperature value, or the heating rate exceeds the preset rate value, the preset charging management is used to perform charging health management. By judging the internal temperature and heating rate of the battery pack, natural problems of the battery pack caused by excessive temperature are avoided, and the problem of prolonging the charging time when the battery pack temperature is excessively lowered is avoided.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] In a first aspect, the present invention provides a charging health management method for a lithium battery for a vehicle, comprising:

[0007] Obtain the ambient temperature of the charging station and the three-dimensional thermal imaging information of the battery pack;

[0008] Determine the internal temperature of the battery pack and the heating rate inside the battery pack based on the 3D thermal imaging information;

[0009] If the ambient temperature is higher than the preset value, the preset battery pack bottom plate cooling strategy is used to cool the battery pack bottom plate;

[0010] If the internal temperature of the battery pack exceeds a preset temperature value, or the heating rate exceeds a preset rate value, the preset charging management is used to perform charging health management.

[0011] Furthermore, during charging, the remaining power of the battery pack is determined; if the remaining power is less than a preset power, the charging pile uses a first power for charging, otherwise it uses a second power for charging; wherein the first power is greater than the second power.

[0012] Further, when the internal temperature of the battery pack is greater than the first preset temperature, or the temperature rise rate is greater than the first temperature rise rate, an abnormal warning is given. At this time, if the charging power is the first charging power, the charging power is reduced to the second charging power;

[0013] When the internal temperature of the battery pack is greater than a second preset temperature, or the heating rate is greater than the second heating rate, and the duration reaches a preset time, charging is stopped, and the preset battery pack bottom plate cooling strategy is used to cool the battery pack bottom plate; wherein, the first preset temperature is lower than the second preset temperature, and the first heating rate is lower than the second heating rate.

[0014] Furthermore, by utilizing a preset battery pack bottom plate cooling strategy, when cooling the battery pack bottom plate, water mist is sprayed on the battery pack bottom plate.

[0015] Furthermore, in the image of the three-dimensional thermal imaging information, the image of the area where the battery pack is located is gridded to obtain a grid map; the area in the grid map where the internal temperature of the battery pack exceeds a preset temperature value, or the heating rate exceeds a preset rate value, is displayed.

[0016] In a second aspect, the present invention further provides a charging health management system for a lithium battery for a vehicle, comprising:

[0017] The data acquisition module is configured to: obtain the ambient temperature of the charging pile and the three-dimensional thermal imaging information of the battery pack;

[0018] The temperature determination module is configured to: determine the internal temperature of the battery pack and the heating rate of the internal battery pack according to the three-dimensional thermal imaging information;

[0019] The first management module is configured to: if the ambient temperature is higher than a preset value, cool the battery pack bottom plate using a preset battery pack bottom plate cooling strategy;

[0020] The second management module is configured to: if the internal temperature of the battery pack exceeds a preset temperature value, or the heating rate exceeds a preset rate value, perform charging health management using a preset charging management.

[0021] In a second aspect, the present invention further provides a charging device for a vehicle lithium battery, comprising a charging pile, a ground trough, a three-dimensional imager disposed in the ground trough, and a spray system disposed at the ground trough;

[0022] An infrared reflective convex mirror is arranged above the ground trough at one end of the charging vehicle away from the ground trough; the three-dimensional imager is arranged in the ground trough through a guide rail; the spray system includes a plurality of rotatable spray pipes, each of which has a plurality of nozzles for spraying water mist;

[0023] The charging pile, the three-dimensional imager and the injection system are connected to a computer, and a computer program is set in the computer. When the program is executed by the processor, the steps of the charging health management method for automotive lithium batteries as described in the first aspect are implemented.

[0024] In a fourth aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the charging health management method for a vehicle lithium battery described in the first aspect.

[0025] In a fifth aspect, the present invention further provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, wherein when the processor executes the program, the steps of the charging health management method for automotive lithium batteries described in the first aspect are implemented.

[0026] In a sixth aspect, the present invention further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the steps of the charging health management method for a vehicle lithium battery described in the first aspect are implemented.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] In the present invention, three-dimensional thermal imaging technology is used to determine the internal temperature of the battery pack and the heating rate inside the battery pack. At the same time, if the detected ambient temperature is higher than the preset value, the preset battery pack bottom plate cooling strategy is used to cool the battery pack bottom plate, thereby avoiding the bottom plate temperature being too high and affecting the accuracy of thermal imaging technology in judging the battery temperature. At the same time, if the internal temperature of the battery pack exceeds the preset temperature value, or the heating rate exceeds the preset rate value, the preset charging management is used to perform charging health management. By judging the internal temperature and heating rate of the battery pack, natural problems of the battery pack caused by excessive temperature are avoided, and the problem of extending the charging time when the battery pack temperature is excessively lowered is avoided. The judgment of the heating rate can also make up for the natural temperature of the battery pack caused by the instantaneous excessive temperature when only the temperature is judged. Because the instantaneous excessive temperature of the battery pack cannot be obtained in time due to problems such as the detection interval and the information transmission delay when the temperature is detected, the temperature trend can be predicted by judging the heating rate, thereby avoiding the natural problem caused by the instantaneous excessive temperature caused by the excessive temperature rising too fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings in the specification that constitute a part of this embodiment are used to provide a further understanding of this embodiment. The schematic embodiments of this embodiment and their descriptions are used to explain this embodiment and do not constitute improper limitations on this embodiment.

[0030] Figure 1 This is the charging process of Example 1 of the present invention;

[0031] Figure 2 This is a schematic diagram of the operation principle of the charging device according to Embodiment 1 of the present invention;

[0032] Figure 3 This is a grid diagram of a battery pack according to Embodiment 1 of the present invention. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0034] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0035] Embodiment 1:

[0036] The current charging pile cannot read the internal temperature data of the battery pack (PACK), and the battery thermal runaway process that may occur during the charging process cannot be grasped. Based on this, a three-dimensional thermal imaging instrument is used in this embodiment to monitor and record the charging process of the lithium battery, focusing on the temperature change rate and the maximum temperature of the parameters. When these two parameters are triggered to the limit, the charging power is limited or even the operation is terminated to prevent the battery pack from spontaneously igniting and causing greater property losses. At the same time, the problems in the charging process are fed back in the form of information, so that the vehicle users can understand the health status of the battery and avoid more serious accidents, such as spontaneous combustion.

[0037] As described in the background technology, when a vehicle is charging, the selected charging piles are generally random in the area, and the vehicle cannot communicate with all the charging piles, and it is also impossible to provide a temperature basis for the health management of charging through the temperature sensors installed inside the vehicle; and when using thermal imaging and other technologies to judge the temperature of the battery pack at the charging pile, the temperature of the bottom plate of the battery pack is often relatively high due to factors such as the external environment, which affects the thermal imaging technology's judgment of the battery temperature, and the measured temperature value will be higher than the actual temperature of the battery pack, resulting in management errors; and the battery temperature will directly affect the charging rate. For example, if the battery is charged when the temperature is low, the charging time required will be longer. The high temperature of the battery pack can shorten the entire charging time, but too high a temperature can easily cause natural problems in the battery pack. The current battery management system cannot solve the contradiction between shortening the charging time and reducing natural risks.

[0038] In response to the above problems, this embodiment provides a charging health management method for automotive lithium batteries, which adopts a charging device, including a charging system, a temperature monitoring system, an information management and control system, and an injection system. The charging system includes a charging pile and a charging gun with adjustable charging power. The charging pile charges the electric vehicle through the charging gun. When a problem occurs during the charging process, the charging power is reduced or the charging operation is terminated; the temperature monitoring system includes a three-dimensional thermal imager, an infrared reflective convex mirror, and a carrier for the three-dimensional thermal imager; the infrared reflective convex mirror can be set up through a bracket, etc., and the carrier can move along the guide rail. The three-dimensional thermal imager monitors the temperature parameters of the battery pack during the charging process of the electric vehicle, including the maximum temperature and the heating rate, and feedbacks to the system when the parameters are abnormal. The infrared reflective convex mirror is fixed and is used to reflect the infrared light of the three-dimensional thermal imager; the carrier moves back and forth along the guide rail with the three-dimensional thermal imaging instrument. The information management and control system is configured as follows: when the three-dimensional thermal imager detects abnormal data, such as the maximum temperature exceeding the limit, the temperature rate changes too much, the control system will send instructions to the charging gun to reduce the charging power or terminate charging, and feedback the information to the owner or charging pile manager; record the information of the electric vehicle and the health assessment of the battery. The injection system includes three fixed and rotatable nozzles, each with multiple nozzles for spraying high-pressure water mist or water flow; the injection system can clean the dust on the chassis guard plate and reduce the temperature of the guard plate in the early stage to avoid overheating of the guard plate and interference with subsequent tests; when the battery pack temperature is too high, spray water mist to reduce the battery pack temperature; later, when the vehicle spontaneously ignites, water can be sprayed from under the chassis to suppress combustion.

[0039] In some embodiments, a method for charging health management of a lithium battery for a vehicle includes:

[0040] Use temperature sensors and other components to obtain the ambient temperature of the charging station, and use a 3D thermal imager to obtain 3D thermal imaging information of the battery pack;

[0041] Determine the internal temperature of the battery pack and the heating rate inside the battery pack based on the 3D thermal imaging information;

[0042] If the ambient temperature is higher than the preset value, the preset battery pack bottom plate cooling strategy is used to cool the battery pack bottom plate;

[0043] If the internal temperature of the battery pack exceeds a preset temperature value, or the heating rate exceeds a preset rate value, the preset charging management is used to perform charging health management.

[0044] In some embodiments, optionally, during charging, the remaining power of the battery pack is determined; if the remaining power is less than a preset power, the charging pile uses a first power for charging, otherwise it uses a second power for charging; wherein the first power is greater than the second power.E Is it greater than 30℃? If it is greater than 30℃ and the road radiation is added, the temperature of the battery pack's underbody plate may be relatively high, which will affect the measurement of the 3D thermal imaging instrument. At this time, spraying some water mist will cool the underbody plate. At the same time, check the SOC status. When SOC>60%, charge at low power; otherwise, charge at high power.

[0045] In some embodiments, optionally, when the internal temperature of the battery pack is greater than the first preset temperature, or the heating rate is greater than the first heating rate, an abnormal warning is given. At this time, if the charging power is the first charging power, the charging power is reduced to the second charging power; when the internal temperature of the battery pack is greater than the second preset temperature, or the heating rate is greater than the second heating rate, and the duration reaches a preset time, charging is stopped, and the preset battery pack bottom plate cooling strategy is used to cool the battery pack bottom plate; wherein, the first preset temperature is less than the second preset temperature, and the first heating rate is less than the second heating rate. For example, the system starts high-power charging, and the three-dimensional thermal imager starts to work periodically, optionally, one cycle every 3s. When the highest temperature point T inside the battery pack reaches 80°C (calibrable, through later charging data) or the heating rate dT / dt>1°C, an abnormal warning is given and the system will record it; then the charging power starts to switch to low power. At this time, the 3D thermal imager will scan the abnormal area (the area inside the battery pack with a temperature of 80°C or a temperature rise rate of dT / dt>1°C) in real time (at a frequency of 10hz), and record the approximate location of the high-temperature area for feedback. When the highest temperature point T inside the battery pack reaches 100°C or the temperature rise rate dT / dt>10°C and lasts for 3s, the power supply will be cut off immediately, and the injection system will work to spray water mist on the bottom plate, and the information will be transmitted to the management personnel. At this time, the 3D thermal imager will feedback the dangerous area (the area inside the battery pack with a temperature of 100°C or a temperature rise rate dT / dt>10°C) to the management personnel.

[0046] In some embodiments, optionally, a preset battery pack bottom plate cooling strategy is used to spray water mist on the battery pack bottom plate when cooling the battery pack bottom plate.

[0047] In some embodiments, optionally, the approximate location of the high temperature zone is recorded for feedback, such as Figure 3 As shown, in the image of the three-dimensional thermal imaging information, the image of the area where the battery pack is located is gridded to obtain a grid map; the area in the grid map where the internal temperature of the battery pack exceeds the preset temperature value, or the heating rate exceeds the preset rate value, is displayed.

[0048] This embodiment uses three-dimensional thermal imaging technology to achieve real-time monitoring of the battery pack temperature and can predict spontaneous combustion to avoid greater property losses. Through real-time monitoring of the battery pack temperature, the health status of the battery can be evaluated, each battery module can be effectively monitored, and unhealthy batteries can be replaced in time, reducing repair and maintenance costs.

[0049] Embodiment 2:

[0050] This embodiment provides a charging health management system for a lithium battery for a vehicle, including:

[0051] The data acquisition module is configured to: obtain the ambient temperature of the charging pile and the three-dimensional thermal imaging information of the battery pack;

[0052] The temperature determination module is configured to: determine the internal temperature of the battery pack and the heating rate of the internal battery pack according to the three-dimensional thermal imaging information;

[0053] The first management module is configured to: if the ambient temperature is higher than a preset value, cool the battery pack bottom plate using a preset battery pack bottom plate cooling strategy;

[0054] The second management module is configured to: if the internal temperature of the battery pack exceeds a preset temperature value, or the heating rate exceeds a preset rate value, perform charging health management using a preset charging management.

[0055] The working method of the system is the same as the charging health management method of the automotive lithium battery in Example 1, and will not be repeated here.

[0056] Embodiment 3:

[0057] This embodiment provides a charging device for a lithium battery for a vehicle, comprising a charging pile, a ground trough, a three-dimensional imager arranged in the ground trough, and a spray system arranged at the ground trough;

[0058] An infrared reflective convex mirror is arranged above the ground trough at one end of the charging vehicle away from the ground trough; the three-dimensional imager is arranged in the ground trough through a guide rail; the spray system includes a plurality of rotatable spray pipes, each of which has a plurality of nozzles for spraying water mist;

[0059] The charging pile, the three-dimensional imager and the injection system are connected to a computer, and a computer program is set in the computer. When the program is executed by the processor, the steps of the charging health management method for automotive lithium batteries as described in Example 1 are implemented.

[0060] Embodiment 4:

[0061] This embodiment provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the steps of the charging health management method for a vehicle lithium battery described in Example 1 are implemented.

[0062] Embodiment 5:

[0063] This embodiment provides an electronic device, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor. When the processor executes the program, the steps of the charging health management method for a vehicle lithium battery described in Example 1 are implemented.

[0064] Embodiment 6:

[0065] This embodiment provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the steps of the charging health management method for a vehicle lithium battery described in Example 1 are implemented.

[0066] The above description is only a preferred embodiment of the present embodiment and is not intended to limit the present embodiment. For those skilled in the art, the present embodiment may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment shall be included in the protection scope of the present embodiment.

Claims

1. A charging health management method for a lithium battery for a vehicle, characterized in that: include: Obtain the ambient temperature of the charging station and the three-dimensional thermal imaging information of the battery pack; Determine the internal temperature of the battery pack and the heating rate inside the battery pack based on the 3D thermal imaging information; If the ambient temperature is higher than the preset value, the preset battery pack bottom plate cooling strategy is used to cool the battery pack bottom plate; If the internal temperature of the battery pack exceeds a preset temperature value, or the heating rate exceeds a preset rate value, the preset charging management is used to perform charging health management.

2. The method for charging health management of a lithium battery for a vehicle according to claim 1, characterized in that: During charging, the remaining power of the battery pack is determined; if the remaining power is less than the preset power, the charging pile uses a first power for charging, otherwise it uses a second power for charging; wherein the first power is greater than the second power.

3. The method for charging health management of a lithium battery for a vehicle as claimed in claim 2, characterized in that: When the internal temperature of the battery pack is greater than the first preset temperature, or the temperature rise rate is greater than the first temperature rise rate, an abnormal warning is given. At this time, if the charging power is the first charging power, the charging power is reduced to the second charging power; When the internal temperature of the battery pack is greater than a second preset temperature, or the heating rate is greater than the second heating rate, and the duration reaches a preset time, charging is stopped, and the preset battery pack bottom plate cooling strategy is used to cool the battery pack bottom plate; wherein, the first preset temperature is lower than the second preset temperature, and the first heating rate is lower than the second heating rate.

4. The method for charging health management of a lithium battery for a vehicle as claimed in claim 1, characterized in that: When cooling the battery pack bottom plate using the preset battery pack bottom plate cooling strategy, water mist is sprayed on the battery pack bottom plate.

5. The method for charging health management of a lithium battery for a vehicle as claimed in claim 1, characterized in that: In the image of the three-dimensional thermal imaging information, the image of the area where the battery pack is located is grid-divided to obtain a grid map; the area in the grid map where the internal temperature of the battery pack exceeds the preset temperature value, or the heating rate exceeds the preset rate value, is displayed.

6. A charging health management system for automotive lithium batteries, characterized in that: include: The data acquisition module is configured to: obtain the ambient temperature of the charging pile and the three-dimensional thermal imaging information of the battery pack; The temperature determination module is configured to: determine the internal temperature of the battery pack and the heating rate of the internal battery pack according to the three-dimensional thermal imaging information; The first management module is configured to: if the ambient temperature is higher than a preset value, cool the battery pack bottom plate using a preset battery pack bottom plate cooling strategy; The second management module is configured to: if the internal temperature of the battery pack exceeds a preset temperature value, or the heating rate exceeds a preset rate value, perform charging health management using a preset charging management.

7. A charging device for a lithium battery for a vehicle, characterized in that: It includes a charging pile, a ground trough, a three-dimensional imager arranged in the ground trough, and a spray system arranged at the ground trough; An infrared reflective convex mirror is arranged above the ground trough at one end of the charging vehicle away from the ground trough; the three-dimensional imager is arranged in the ground trough through a guide rail; the spray system includes a plurality of rotatable spray pipes, each of which has a plurality of nozzles for spraying water mist; The charging pile, the three-dimensional imager and the injection system are connected to a computer, and a computer program is set in the computer. When the program is executed by the processor, the steps of the charging health management method of the automotive lithium battery as described in any one of claims 1-5 are implemented.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the charging health management method for a vehicle lithium battery as described in any one of claims 1 to 5 are implemented.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, characterized in that: When the processor executes the program, the steps of the charging health management method for a vehicle lithium battery as described in any one of claims 1-5 are implemented.

10. A computer program product, characterized in that The computer program product includes a computer program, and when the computer program is executed by a processor, the steps of the charging health management method for a vehicle lithium battery as described in any one of claims 1-5 are implemented.

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