Battery thermal management method and device

Abstract

The invention relates to a battery thermal management method and device, and belongs to the technical field of thermal management. The method comprises the following steps: when a battery is in a high-temperature operation state and a battery thermal management system is in a fault state, outputting a reminding instruction, and after an interval of maintenance time, if the battery thermal management system is still in the fault state, outputting the reminding instruction again and simultaneously limiting the charging and discharging power of the battery or only limiting the charging and discharging power of the battery; the reminding instruction is used for reminding that the battery thermal management system needs to be maintained, and the maintenance time is determined according to the time required by the battery thermal management system for each maintenance. According to the method, reminding is carried out in time under the conditions that the thermal management system breaks down and the battery runs at high temperature, after sufficient maintenance time is given, it is found that the battery thermal management system still breaks down, only the charging and discharging power of the battery is limited to reduce the abnormal attenuation speed of the service life of the battery, and the probability that reminding is forgotten exists is considered. And reminding is carried out on the basis of limiting the charging and discharging power of the battery.

Description

Technical Field

[0001] The present invention relates to a battery thermal management method and device, belonging to the technical field of thermal management. Background Art

[0002] For the high-voltage power batteries of electric vehicles, especially those of commercial vehicles, the operating conditions of large current charging and discharging are relatively frequent, which intensifies the temperature rise of the power battery, resulting in the power battery working in a high-temperature environment for a long time. The high temperature of the power battery will first affect the performance of the battery. In a high-temperature environment, the internal resistance of the battery increases, resulting in a decrease in both the charging efficiency and the discharging efficiency. Secondly, it will affect the battery life. Continuous high temperature will accelerate the chemical reaction rate inside the battery, leading to an increase in the loss of substances inside the battery, thereby shortening the battery life. Finally, continuous high temperature also poses a certain safety risk.

[0003] The thermal management system of the vehicle is used to ensure that the battery operates within a suitable temperature range. However, with the continuous use of the vehicle, problems such as insufficient refrigeration will occur in the vehicle's thermal management system, such as: the water pump idling, the water circuit not circulating, insufficient cooling capacity, etc., making the refrigeration capacity of the thermal management system unable to meet the cooling requirements of the battery. The insufficient refrigeration capacity of the thermal management system generally does not immediately affect the vehicle use, so the thermal management system basically cannot be repaired in time, which in turn leads to irreversible damage to the battery life due to the continuous high-temperature operation of the battery. [[ID=--]]

[0004] In view of the above situation, there is currently no effective control means, and the general treatment idea is: when the refrigeration system breaks down and affects the use of the air conditioner in the cab or the battery reports a high-temperature fault, that is, when the refrigeration system failure has seriously affected the operation of the vehicle, the customer (vehicle owner) will contact the vehicle after-sales for repair. [[ID=--]]

[0005] This treatment method has the following problems: 1. High repair cost: Since the problem is discovered late and there is no timely intervention when the problem of the refrigeration system is not serious, it leads to the breakdown of the thermal management system, increasing the repair cost and affecting the vehicle operation; 2. Slow processing progress: The customer needs to actively contact the after-sales or go to the after-sales service network to cooperate in checking the vehicle problems, and the repair progress is greatly affected by the customer; 3. The repair effect cannot be guaranteed: After the vehicle is repaired, the vehicle use status cannot be tracked in real time, resulting in the repair effect not being guaranteed; 4. Excessive battery life attenuation: Since the problem is discovered late, the abnormal attenuation of the battery life caused by the continuous high-temperature operation of the battery is too fast and the attenuation degree is too serious.

[0006] Existing solutions only provide strategies for extending battery life when the thermal management system is in a normal state, or strategies for ensuring that the battery operates within a suitable temperature range when the thermal management system is in a normal state. However, they do not address how to ensure normal battery use and reduce the impact on battery life in the case of a refrigeration failure in the thermal management system and continuous high-temperature operation of the battery. Summary of the Invention

[0007] The object of the present invention is to provide a battery thermal management method and device to solve the problem that the battery life decays abnormally fast while affecting vehicle operation due to the repair of the thermal management system only when it has already affected vehicle operation.

[0008] To achieve the above object, the solution of the present invention includes: A battery thermal management method of the present invention includes the following steps: When the battery is in a high-temperature operation state and the battery thermal management system is in a fault state, an alarm instruction is output. After an interval of repair time, if the battery thermal management system is still in a fault state, while outputting the alarm instruction again, the charge and discharge power of the battery is restricted or only the charge and discharge power of the battery is restricted. Among them, the alarm instruction is used to remind that the battery thermal management system needs to be repaired, and the repair time is determined according to the time required for each repair of the battery thermal management system.

[0009] Advantages of the present invention: The present invention is a pioneering invention that provides a battery thermal management method. When the thermal management system fails and the battery continues to operate at a high temperature, at this time, the failure of the thermal management system has not been severe enough to affect vehicle operation. An alarm of "the battery thermal management system needs to be repaired" is given in a timely manner. If it is found that the battery thermal management system is still faulty after sufficient repair time, it is considered that the battery thermal management system has not been repaired in time. In order to further reduce the abnormal decay rate of battery life, only by restricting the charge and discharge power of the battery to reduce the operating temperature of the battery. Of course, considering that the repair reminder may be forgotten or omitted, on the basis of restricting the charge and discharge power of the battery to reduce the operating temperature of the battery, an alarm of "the battery thermal management system needs to be repaired" is given again.

[0010] Further, after restricting the charge and discharge power of the battery, after an interval of repair time, the state of the battery thermal management system is rejudged: If it is still in a fault state, while outputting the alarm instruction again, restricting again or only restricting again, and the charge and discharge power of the battery after the current restriction is lower than that after the previous restriction, and after an interval of repair time, judge again until the battery thermal management system is in a normal state; If it is in a normal state, the restriction on the charge and discharge power is released.

[0011] Furthermore, the range of the degree of limitation of the charge and discharge power is from 5% to 25%.

[0012] Furthermore, the reminder instruction output for the first time is sent to after-sales, and the reminder instructions output after the first time are sent to after-sales and / or the vehicle owner.

[0013] Furthermore, the reminder method of the reminder instruction includes: communicating the reminder information included in the reminder instruction to after-sales and / or displaying the reminder information to the vehicle owner through the vehicle instrument.

[0014] Furthermore, when the historical average operating temperature of the battery is higher than the upper limit of the healthy operating temperature of the battery, it is considered that the battery is in a high-temperature operating state.

[0015] A battery thermal management method of the present invention includes the following steps: When the battery is in a high-temperature operating state and the battery thermal management system is in a fault state, a reminder instruction is output. After an interval of maintenance time, if the battery thermal management system is still in a fault state, the reminder instruction is output again. After an interval of maintenance time, if the battery thermal management system is still in a fault state, while outputting the reminder instruction again, the charge and discharge power of the battery is restricted or only the charge and discharge power of the battery is restricted; Among them, the reminder instruction is used to remind that the battery thermal management system needs to be repaired, and the maintenance time is determined according to the time required for each repair of the battery thermal management system.

[0016] The present invention is a pioneering invention, providing a battery thermal management method. When the thermal management system fails and the battery continues to operate at a high temperature, at this time, the failure of the thermal management system has not been severe enough to affect vehicle operation. A timely reminder of "the battery thermal management system needs to be repaired" is given. If it is found that the battery thermal management system is still faulty after giving sufficient maintenance time, it is considered that the battery thermal management system has not been repaired in time. However, considering the possibility of the maintenance reminder being forgotten or omitted, a reminder of "the battery thermal management system needs to be repaired" is given again. If it is found that the battery thermal management system is still faulty after giving sufficient maintenance time, it is considered that the battery thermal management system has not been repaired in time, and considering the impact of high temperature on the battery, the charge and discharge power of the battery is only restricted to reduce the operating temperature of the battery, further reducing the speed of abnormal attenuation of the battery life. Of course, considering the possibility of the maintenance reminder being forgotten or omitted and the need for the battery thermal management system to be repaired as soon as possible, a reminder of "the battery thermal management system needs to be repaired" is given again while restricting the charge and discharge power of the battery to reduce the operating temperature of the battery.

[0017] Furthermore, after restricting the charge and discharge power of the battery, after an interval of maintenance time, the state of the battery thermal management system is rejudged: If the battery is still in a faulty state, the battery will be restricted again or only restricted again while outputting a reminder command, and the battery charge and discharge power after the current restriction is lower than the battery charge and discharge power after the previous restriction, and after a maintenance period, the battery will be judged again until the battery thermal management system is in a normal state. If it is in normal state, the charge and discharge power limit is released.

[0018] Furthermore, the reminder instruction outputted for the first time is outputted to after-sales service, and the reminder instructions outputted after the first time are outputted to the vehicle owner.

[0019] A battery thermal management device of the present invention includes a processor, which is used to execute a computer program to implement the steps of the battery thermal management method described above and achieve the corresponding effects of the battery thermal management method described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a flowchart of the overall workflow of vehicle battery thermal management; Figure 2 It is a flow chart of the battery thermal management method. DETAILED DESCRIPTION

[0021] To solve the problems in the background technology, the present invention monitors the battery temperature and thermal management system, detects abnormalities in a timely manner, and intervenes to control the impact of high-temperature operation of the battery within an acceptable range.

[0022] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0023] Example 1 of a battery thermal management method: A battery thermal management method comprises the following steps: When the battery is operating at high temperatures and the battery thermal management system is faulty, a warning message is output. At this point, if the thermal management system failure is not severe enough to affect vehicle operation, a "battery thermal management system requires maintenance" reminder message is promptly conveyed, reminding the user to repair the battery thermal management system promptly. The user here can be the vehicle user, owner, or manager, specifically the vehicle owner, a third-party after-sales service provider, or even the operator.

[0024] Considering that the user may have performed repairs under this reminder, the monitoring during this repair time is meaningless. Therefore, the status of the battery thermal management system is no longer monitored during the sufficient repair time, allowing the battery thermal management system to complete the repair during the repair time. So after the interval of the repair time, if the battery thermal management system is still in a fault state, considering the possibility that the repair reminder may be forgotten or omitted, and in order to further reduce the speed of abnormal attenuation of the battery life, while re-outputting the reminder instruction, the charge and discharge power of the battery is also restricted. Or, considering that the user may see the reminder information but is unable to arrange the repair during the repair time or perform the repair shortly after the repair time due to other reasons, in order to promptly reduce the speed of abnormal attenuation of the battery life, only the charge and discharge power of the battery is restricted.

[0025] Among them, by restricting the charge and discharge power of the battery to reduce the operating temperature of the battery, the speed of abnormal attenuation of the battery life is reduced.

[0026] Among them, the reminder instruction is used to remind that the battery thermal management system needs to be repaired.

[0027] Among them, the repair time is determined according to the time required for each repair of the battery thermal management system.

[0028] Among them, the battery thermal management system being in a fault state means that the battery thermal management system has problems such as insufficient refrigeration, for example: the water pump idling, the water circuit not circulating, insufficient cooling capacity, etc.; or the battery thermal management system being in a fault state means a fault of the battery thermal management system that affects the cooling of the battery.

[0029] An embodiment 2 of a battery thermal management method: A battery thermal management method includes the following steps: When the battery is in a high-temperature operating state and the battery thermal management system is in a fault state, a reminder instruction is output. At this time, the fault of the thermal management system has not been severe enough to affect vehicle operation, and the reminder information of "the battery thermal management system needs to be repaired" is conveyed in a timely manner to remind the user to repair the battery thermal management system in a timely manner. The user here can be the vehicle user, the vehicle owner, or the vehicle management party.

[0030] Considering that the user may have performed repairs under this reminder, the monitoring during this repair time is meaningless. Therefore, the status of the battery thermal management system is not monitored during the sufficient repair time, allowing the battery thermal management system to complete the repair during the repair time. So after the interval of the repair time, if the battery thermal management system is still in a fault state, considering the possibility that the repair reminder may be forgotten or missed, a reminder instruction is re-output to convey the reminder message of "the battery thermal management system needs to be repaired" again, reminding the user to repair the battery thermal management system in time. If the battery thermal management system is still not repaired during the repair time given this time, that is, after the interval of the repair time, the battery thermal management system is still in a fault state, considering the possibility that the repair reminder may be forgotten or missed, and in order to further reduce the speed of abnormal attenuation of the battery life, the charge and discharge power of the battery is limited while re-outputting the reminder instruction. Or, considering the possibility that the user may see the reminder message but is unable to arrange the repair within the two repair times due to other reasons and performs the repair shortly after the two repair times, in order to promptly reduce the speed of abnormal attenuation of the battery life, only the charge and discharge power of the battery is limited.

[0031] Among them, by limiting the charge and discharge power of the battery to reduce the operating temperature of the battery, the speed of abnormal attenuation of the battery life is reduced.

[0032] Among them, the reminder instruction is used to remind that the battery thermal management system needs to be repaired.

[0033] Among them, the repair time is determined according to the time required for each repair of the battery thermal management system. As time goes by, the faults of the battery thermal management system may expand in the fault range and intensify in the fault degree over time, but it is also possible to remain unchanged. Therefore, the repair time interval each time is determined according to the time required for each fault repair, and it should at least ensure that the repair work can be completed with quality during the repair time.

[0034] Among them, the battery thermal management system being in a fault state means that the battery thermal management system has problems such as insufficient refrigeration, for example: the water pump idling, the water circuit not circulating, insufficient cooling capacity, etc.; or the battery thermal management system being in a fault state means the fault of the battery thermal management system that affects the cooling of the battery.

[0035] Considering that there may be a possibility of never repairing after limiting the charge and discharge power of the battery, therefore, after re-outputting the reminder instruction while limiting the charge and discharge power of the battery or only limiting the charge and discharge power of the battery as described above, after the interval of the repair time required this time, the status of the battery thermal management system is re-judged: If the battery thermal management system is still in a fault state, a reminder instruction is output again, indicating the urgency of "repair needs" while restricting the charging and discharging power of the battery again, further reducing the speed of abnormal attenuation of the battery life, or only restricting the charging and discharging power of the battery again. Among them, after the current restriction, the charging and discharging power of the battery is lower than that after the previous restriction. After an interval of maintenance time, the state of the battery thermal management system is judged again until the battery thermal management system is in a normal state. After being in a normal state, the restriction on the charging and discharging power is lifted; if the battery thermal management system is in a normal state, the restriction on the charging and discharging power is lifted.

[0036] This solution intervenes in a timely manner by reminding of maintenance or restricting the charging and discharging power, avoiding the situation where the failure degree of the battery thermal management system is so severe that it affects vehicle operation before repair, and the battery life has been abnormally attenuated too much, and controlling the adverse effects of high-temperature operation of the battery caused by the failure of the battery thermal management system within an acceptable range as much as possible.

[0037] Specifically, combined with the actual needs, the degree of restricting the charging and discharging power of the battery each time can be adjusted. The range of the degree of restricting the charging and discharging power in this solution is preferably 5% to 25%. When operating specifically, in order to reduce the impact of high-temperature operation on the battery life as soon as possible, the charging and discharging power of the battery is restricted to 80% for the first time, and the degree of restriction is 15%; on this basis, in order to reduce the impact on vehicle use and the impact of high-temperature operation on the battery life and balance the relationship between the two, the charging and discharging power of the battery is restricted to 75% for the second time, and the degree of restriction for the second time is only 5% based on the first time. When operating specifically, in order to reduce the impact of high-temperature operation on the battery life as soon as possible, the charging and discharging power of the battery is restricted to 70% for the first time, and the degree of restriction is 25%; on this basis, in order to reduce the impact on vehicle use and the impact of high-temperature operation on the battery life and balance the relationship between the two, the charging and discharging power of the battery is restricted to 65% for the second time, and the degree of restriction for the second time is only 5% based on the first time.

[0038] Specifically, considering that customers need to actively contact the after-sales or go to the after-sales service network to cooperate in checking vehicle problems, which seriously affects the repair progress, the reminder instruction output for the first time is directly output to the after-sales, and the after-sales contacts the customer to coordinate the repair work. Considering other risks such as the after-sales being unable to contact the vehicle owner, the reminder instructions output after the first time are output to the after-sales and the vehicle owner, or only output to the vehicle owner. Of course, considering the wishes of the vehicle owner, the reminder instructions output after the first time can also be all output to the after-sales, and the after-sales contacts the customer to coordinate the subsequent repair work.

[0039] Specifically, the reminder methods of the reminder instruction include: communicating the reminder information included in the reminder instruction to after-sales, which can be in the form of text messages, APP pop-up notifications, or dispatching maintenance tasks.

[0040] As other implementation manners, the reminder methods of the reminder instruction include: displaying the reminder information to the vehicle owner through the vehicle instrument or notifying the vehicle owner of the reminder information by text message, etc.

[0041] As other implementation manners, the reminder methods of the reminder instruction include: communicating the reminder information included in the reminder instruction to after-sales and displaying the reminder information to the vehicle owner through the vehicle instrument.

[0042] Specifically, when the historical average operating temperature of the battery is higher than the upper limit of the healthy operating temperature of the battery, it is considered that the battery is in a high-temperature operating state.

[0043] As other implementation manners, it can also be considered that the battery is in a high-temperature operating state when the real-time operating temperature of the battery is higher than the upper limit of the healthy operating temperature of the battery. Or, when the temperature difference between the current temperature and the previous temperature of the battery is greater than the temperature threshold, it is considered that the battery is in a high-temperature operating state, and the temperature threshold can be selected and set according to historical data.

[0044] Specifically, the maintenance time can be set to 3 to 15 days. It is specifically set in combination with the actual fault situation.

[0045] Specifically, when the battery thermal management system is in a normal state, the temperature of the battery and the state of the thermal management system are monitored in real time.

[0046] An embodiment of a battery thermal management device: A battery thermal management device includes a processor, and the processor is used to execute a computer program to implement the steps of a battery thermal management method and achieve the corresponding effects of a battery thermal management method. Among them, a battery thermal management method has been described in detail in Embodiment 1 and Embodiment 2 of a battery thermal management method, and will not be elaborated here.

[0047] Specifically, the processor adopts a big data platform, and the overall working process of vehicle battery thermal management using the big data platform is as Figure 1As shown, it includes vehicle-side battery management, big data cloud platform (big data platform), vehicle-cloud interaction management, remote monitoring platform, vehicle thermal management, etc. The remote monitoring platform obtains the battery temperature of the vehicle-side battery management and the operating status of the vehicle thermal management, and uploads the data to the big data platform. The big data platform determines the operating status of the battery and the status of the battery thermal management system. When the average operating temperature of the power battery continues to be higher than the healthy operating temperature range of the battery, combined with the relevant fault codes and fault manifestations within the monthly cycle of the vehicle thermal management system, and in conjunction with the corresponding maintenance guidance, a fault push task is formed and the push task is sent to the after-sales APP in the form of a text message dispatch. The specific prompt method can be an SMS prompt. The after-sales APP or the big data platform can limit the battery charging and discharging power of the vehicle. When the battery is charging, the vehicle interacts with the charging pile and informs the charging pile how much charging power the vehicle currently needs to provide. The charging pile can provide the charging power according to the vehicle's requirements. If the battery charging and discharging power has been limited before maintenance, the limitation will be lifted through the after-sales APP after the maintenance is completed.

[0048] Taking a monthly cycle with a 10-day maintenance period as an example, the battery thermal management method is further explained: 1. When the vehicle is operating normally and the battery thermal management system has no fault notifications, the big data platform determines the operating temperature of the vehicle's power battery and the fault status of the thermal management system. Specifically, the platform obtains the average power battery temperature within the vehicle's monthly cycle. If the average power battery operating temperature is continuously higher than the battery's healthy operating temperature range, the platform generates a fault notification task based on the relevant fault codes and fault manifestations within the vehicle's thermal management system's monthly cycle and corresponding maintenance guidance.

[0049] 2. For vehicles reported by big data, maintenance reminders will be pushed to the vehicle after-sales service through the after-sales platform first. The maintenance cycle is 10 days (no repeated push to after-sales service will be made within 10 days).

[0050] 3. After 10 days of after-sales service, big data will be used to identify whether the vehicle still has any fault codes and fault symptoms related to thermal management. If there is a fault, big data will send a message to the instrument panel through the cloud, saying "Battery cooling is abnormal, battery is high temperature, please inspect." If there is no fault, relevant tasks will be pushed to remove the fault restrictions.

[0051] 4. Ten days after the instrument panel is pushed, big data continues to identify whether the vehicle has any thermal management system-related fault codes and fault symptoms. If there is a fault, big data will send the instrument panel a message through the cloud: "Battery cooling is abnormal, driving and charging are restricted." The vehicle will then begin to initially implement charging and discharging power restrictions.

[0052] 5. Ten days after the vehicle begins to initially implement the charge and discharge power restrictions, big data continues to identify whether the vehicle still has liquid cooling system alarms. If there is a fault, big data will send a message to the instrument panel via the cloud, indicating that "battery cooling is abnormal, driving and charging are severely restricted." The vehicle will then begin to further implement the charge and discharge power restrictions.

[0053] 6. Develop a function to release fault restrictions in real time after the liquid cooling system repair is completed. After the after-sales service clicks on the repair completion through the after-sales APP, the fault restrictions must be released immediately. Specifically, when the after-sales service repairs the vehicle thermal management system for the customer, the relevant fault restrictions will be lifted for the customer in real time through the after-sales APP.

[0054] 7. After the after-sales APP resolves the fault, big data continues to identify whether the vehicle has any thermal management system-related fault codes and fault manifestations. If there is a fault, it means that the vehicle's thermal management maintenance has not been completed. Big data will continue to push tasks based on the current vehicle fault status.

[0055] 8. Closed-loop management of fault triggering and fault clearance accelerates the maintenance progress of the vehicle's thermal management system, reduces maintenance costs, speeds up maintenance progress, and ensures the safe use of the vehicle's power battery.

[0056] The whole process is as follows Figure 2 As shown, automatic judgment and push are made through the big data platform, the data comes from the whole vehicle, the push accuracy is high, the degree of automation is high, the fault push and release closed-loop management is carried out, and the overall method is simple and reliable.

[0057] This solution can be applied to the thermal management of high-voltage power batteries of electric vehicles such as buses, passenger cars, trucks, mining vehicles, cleaning vehicles, and special-purpose vehicles. It also involves areas such as vehicle-side battery management, big data cloud platforms, vehicle-cloud interaction management, remote monitoring data transmission methods, and vehicle thermal management, especially for battery thermal management in high-current charging and discharging scenarios of commercial vehicles.

[0058] To deal with long-term high temperatures of electric vehicle batteries, the historical average operating temperature of the vehicle's power battery and the historical fault status of the thermal management system are obtained through the big data platform. When the historical average operating temperature of the vehicle's battery is higher than the healthy operating temperature range of the battery, the corresponding fault information and corresponding maintenance instructions are sent to the vehicle's after-sales professional maintenance through the integrated after-sales platform in combination with the fault status of the vehicle's thermal management system. If the customer and after-sales do not repair the thermal management system after a period of time, the relevant information will be prompted through the instrument; after a period of time after the instrument is pushed, if the customer and after-sales do not repair the thermal management system, the vehicle will begin to initially implement charge and discharge power restrictions, and remind the instrument to remind the customer to repair the thermal management system as soon as possible; after the vehicle initially limits the charge and discharge power for a period of time, if the customer and after-sales do not repair the thermal management system, the vehicle will begin to further implement charge and discharge power restrictions, and remind the instrument to ensure that the vehicle battery operating temperature is within the healthy operating temperature range of the battery.

[0059] The big data used in this solution to determine if a fault is established is derived from real vehicles and is not restricted by the vehicle's operating area, operating conditions, environment, and other conditions, resulting in high accuracy in fault notification.

[0060] In this plan, faults are reported first and then notified to the customer, with priority given to after-sales service to coordinate repairs for the customer. If the vehicle continues to be unable to be repaired, restrictions will be implemented to ensure the battery operating temperature.

[0061] The fault resolution of this solution is done through the after-sales APP, which can ensure that the vehicle restrictions are released in real time without affecting customer use, and the fault resolution method is simple and reliable.

[0062] After the fault is resolved in this solution, big data will continue to make judgments, and after the repair is completed, the vehicle usage status will be automatically tracked to ensure the repair effect.

[0063] The closed-loop management of fault push and release in this solution has a high degree of automation, that is, the entire chain of fault judgment, push and release has a high degree of automation and high accuracy, and the overall method is simple and reliable.

[0064] This solution combines the big data platform to determine the vehicle's historical battery temperature and thermal management system operating performance, pushes relevant fault information to after-sales and customers, speeds up the maintenance progress of the vehicle's thermal management system, reduces maintenance costs, and ensures the safe use of the vehicle's power battery.

Claims

1. A battery thermal management method, characterized in that, It includes the following steps: When the battery is in a high-temperature operating state and the battery thermal management system is in a faulty state, an alert instruction is output. After an interval of repair time, if the battery thermal management system is still in a faulty state, the alert instruction is output again, and at the same time, the charge and discharge power of the battery is restricted or only the charge and discharge power of the battery is restricted. Among them, the alert instruction is used to remind that the battery thermal management system needs to be repaired, and the repair time is determined according to the time required for each repair of the battery thermal management system.

2. The battery thermal management method according to claim 1, characterized in that, After restricting the charge and discharge power of the battery, after an interval of repair time, the state of the battery thermal management system is judged again: If it is still in a faulty state, the alert instruction is output again and the above restriction is carried out again or only the above restriction is carried out again, and the charge and discharge power of the battery after the current restriction is lower than the charge and discharge power of the battery after the previous restriction. After an interval of repair time, the above judgment is carried out again until the battery thermal management system is in a normal state. If it is in a normal state, the restriction on the charge and discharge power is lifted.

3. The battery thermal management method according to claim 1, wherein The range of the degree of restriction of the charge and discharge power is from 5% to 25%.

4. The battery thermal management method according to claim 1, wherein The first output of the alert instruction is sent to after-sales, and the alert instruction output after the first time is sent to after-sales and / or the vehicle owner.

5. The battery thermal management method according to claim 1, characterized in that, The alert method of the alert instruction includes: communicating the alert information included in the alert instruction to after-sales and / or displaying the alert information to the vehicle owner through the vehicle dashboard.

6. The battery thermal management method according to any one of claims 1 to 5, characterized in that, When the historical average operating temperature of the battery is higher than the upper limit of the healthy operating temperature of the battery, it is considered that the battery is in a high-temperature operating state.

7. A battery thermal management method, characterized in that, It includes the following steps: When the battery is in a high-temperature operating state and the battery thermal management system is in a faulty state, an alert instruction is output. After an interval of repair time, if the battery thermal management system is still in a faulty state, the alert instruction is output again. And after an interval of repair time, if the battery thermal management system is still in a faulty state, the alert instruction is output again and the charge and discharge power of the battery is restricted or only the charge and discharge power of the battery is restricted. Among them, the alert instruction is used to remind that the battery thermal management system needs to be repaired, and the repair time is determined according to the time required for each repair of the battery thermal management system.

8. The battery thermal management method according to claim 7, wherein After restricting the charge and discharge power of the battery, after an interval of repair time, the state of the battery thermal management system is judged again: If it is still in a faulty state, the alert instruction is output again and the above restriction is carried out again or only the above restriction is carried out again, and the charge and discharge power of the battery after the current restriction is lower than the charge and discharge power of the battery after the previous restriction. After an interval of repair time, the above judgment is carried out again until the battery thermal management system is in a normal state. If it is in a normal state, the restriction on the charge and discharge power is lifted.

9. The battery thermal management method according to claim 7, wherein The first output of the alert instruction is sent to after-sales, and the alert instruction output after the first time is sent to the vehicle owner.

10. A battery thermal management device, comprising a processor, characterized in that, The processor is used to execute a computer program to implement the steps of the battery thermal management method according to any one of claims 1 to 9.

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