Charging and discharging control method and low-temperature heating system

Abstract

The invention provides a charging and discharging control method and a low-temperature heating system, and relates to the technical field of storage batteries, a first battery temperature detection module is arranged in a high-temperature area on the surface of a battery, the first battery temperature detection module is arranged in a low-temperature area on the surface of the battery, and a heating module is attached to the outer surface of a battery pack. The environment temperature detection unit is arranged outside the battery pack. The method comprises the following steps: respectively collecting first temperature data corresponding to a battery fed back by a first battery temperature detection module, second temperature data corresponding to the battery fed back by a second battery temperature detection module and environment temperature fed back by the environment temperature detection unit; according to the first temperature data, the second temperature data, the charging and discharging state, the heating state, the environment temperature, the battery charge state and the battery charging and discharging control strategy, charging and discharging control is conducted on the battery. The temperature detection modules are arranged in the high-temperature area and the low-temperature area of the battery respectively, so that the accuracy of the detected battery temperature is improved, and the subsequent charging and discharging control precision of the battery is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a charge and discharge control method and a low-temperature heating system. Background Art

[0002] Currently, the corresponding arrangement of temperature sensors used to monitor battery cell temperature in most portable energy storage products is only suitable for monitoring battery cell temperature under normal temperature conditions. When used in low-temperature heating conditions, this arrangement will cause large deviations in the monitored battery cell temperature, causing the subsequent charging and discharging control process based on the collected battery cell temperature to lose accuracy. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide at least a charge and discharge control method and a low-temperature heating system. By arranging temperature detection modules in the high and low temperature areas of the battery respectively, the accuracy of the detected battery temperature is improved, and the subsequent charge and discharge control accuracy of the battery is improved.

[0004] This application mainly includes the following aspects:

[0005] In the first aspect, an embodiment of the present application provides a charge and discharge control method, which is applied to a battery management system in a low-temperature heating system. The low-temperature heating system includes a heating module, a battery pack, a first battery temperature detection module, a second battery temperature detection module and an ambient temperature detection unit. A battery is arranged in the battery pack, the first battery temperature detection module is arranged in a high-temperature area on the surface of the battery, the second battery temperature detection module is arranged in a low-temperature area on the surface of the battery, the heating module is attached to the outer surface of the battery pack, and the ambient temperature detection unit is arranged outside the battery pack. The method includes: respectively collecting first temperature data corresponding to the battery fed back by the first battery temperature detection module, second temperature data corresponding to the battery fed back by the second battery temperature detection module, and ambient temperature fed back by the ambient temperature detection unit; and controlling the charge and discharge of the battery according to the first temperature data, the second temperature data, the charge and discharge status, the heating status corresponding to the heating module, the ambient temperature, the battery state of charge and the battery charge and discharge control strategy.

[0006] In one possible implementation, a battery charge and discharge control strategy includes a battery charge control strategy and a battery discharge control strategy, wherein the battery charge and discharge control is performed in the following manner: determining whether to perform low-temperature heating compensation on the battery based on first temperature data and second temperature data; if it is determined that low-temperature heating compensation is performed on the battery, determining the maximum temperature measured by the battery and the minimum temperature measured by the battery based on the first temperature data and the second temperature data; executing a preset temperature compensation strategy based on the maximum temperature measured by the battery, the minimum temperature measured by the battery and the ambient temperature to determine a high temperature compensation value and a low temperature compensation value; using the high temperature compensation value and the low temperature compensation value to compensate for the battery temperature to determine the actual maximum battery temperature and the actual minimum battery temperature corresponding to the battery; and performing charge and discharge control on the battery based on the actual maximum battery temperature, the actual minimum battery temperature, the battery charge control strategy and the battery discharge control strategy.

[0007] In one possible embodiment, the first battery temperature detection module includes a first temperature detection unit and a second temperature detection unit, and the second battery temperature detection module includes a third temperature detection unit and a fourth temperature detection unit. The first temperature detection unit, the second temperature detection unit, the third temperature detection unit and the fourth temperature detection unit are symmetrically arranged with the middle of the battery as the axis of symmetry, and are V-shaped symmetrical. The first temperature detection unit and the second temperature detection unit are arranged in the middle of the upper surface of the battery, close to the side of the heating module, and the third temperature detection unit and the fourth temperature detection unit are respectively arranged at the two ends of the battery on the upper surface of the battery away from the heating module. The first temperature data includes the first temperature and the second temperature detected by the first temperature detection unit. The second temperature collected by the temperature detection unit, the second temperature data includes the third temperature collected by the third temperature detection unit and the fourth temperature collected by the fourth temperature detection unit, wherein the maximum temperature measured by the battery and the minimum temperature measured by the battery are determined by: comparing the first temperature and the second temperature corresponding to the high temperature area to determine the maximum temperature and the minimum temperature of the high temperature area; comparing the third temperature and the fourth temperature corresponding to the low temperature area to determine the maximum temperature and the minimum temperature of the low temperature area; determining the maximum value between the maximum temperature of the high temperature area and the maximum temperature of the low temperature area as the maximum temperature measured by the battery, and determining the minimum value between the minimum temperature of the high temperature area and the minimum temperature of the low temperature area as the minimum temperature measured by the battery.

[0008] In one possible implementation, whether to perform low-temperature heating compensation on the battery is determined by comparing the lowest temperature in the high-temperature zone with the lowest temperature in the low-temperature zone; if it is determined that the lowest temperature in the high-temperature zone is lower than the lowest temperature in the low-temperature zone, an abnormal battery temperature alarm is issued; if it is determined that the lowest temperature in the high-temperature zone is greater than or equal to the lowest temperature in the low-temperature zone, low-temperature heating compensation is performed on the battery.

[0009] In one possible implementation, the preset temperature compensation strategy includes: determining whether the ambient temperature is less than 0°C; if the ambient temperature is greater than or equal to 0°C, determining the high temperature compensation value to be the first preset temperature and the low temperature compensation value to be the second preset temperature; if the ambient temperature is less than 0°C, determining whether the lowest temperature measured by the battery is less than 0°C; if it is determined that the lowest temperature measured by the battery is less than 0°C, determining the high temperature compensation value to be the third preset temperature and the low temperature compensation value to be the fourth preset temperature; if it is determined that the lowest temperature measured by the battery is greater than or equal to 0°C, determining the high temperature compensation value to be the fifth preset temperature and the low temperature compensation value to be the sixth preset temperature.

[0010] In one possible implementation, the step of compensating the battery temperature using the high temperature compensation value and the low temperature compensation value to determine the actual temperature corresponding to the battery includes: calculating a first sum between the maximum temperature measured by the battery and the high temperature compensation value, and determining the first sum as the actual maximum temperature of the battery; and calculating a second sum between the minimum temperature measured by the battery and the low temperature compensation value, and determining the second sum as the actual minimum temperature of the battery.

[0011] In one possible implementation, the battery charging control strategy includes: determining that the battery is in a charging state, then determining whether the actual battery minimum temperature is greater than 0°C; determining that the actual battery minimum temperature is less than or equal to 0°C, turning on the heating module; determining that the actual battery minimum temperature is greater than 0°C, then determining whether the actual battery minimum temperature is greater than a first temperature threshold; determining that the actual battery minimum temperature is less than or equal to the first temperature threshold, charging the battery according to a preset small-rate charging power table, which describes a first mapping relationship between the state of charge interval, the actual battery minimum temperature, and the charging rate; determining that the actual battery minimum temperature is greater than the first temperature threshold, then turning off the heating module, and determining whether the actual battery maximum temperature is greater than a second temperature threshold; determining that the actual battery maximum temperature is greater than the second temperature threshold, ending charging; determining that the actual battery maximum temperature is less than or equal to the second temperature threshold, then charging the battery according to a preset large-rate charging power table, which describes a second mapping relationship between the state of charge interval, the actual battery maximum temperature, and the charging rate.

[0012] In one possible implementation, a battery discharge control strategy includes: determining that the battery is in a discharging state, determining whether the actual battery minimum temperature is greater than a third temperature threshold; terminating discharge if the actual battery minimum temperature is less than or equal to the third temperature threshold; determining whether the actual battery minimum temperature is greater than the third temperature threshold, determining whether the actual battery minimum temperature is greater than 0°C; determining whether the actual battery minimum temperature is greater than 0°C, determining whether the actual battery minimum temperature is greater than a first temperature threshold; determining that the actual battery minimum temperature is less than or equal to the first temperature threshold, discharging the battery according to a first preset high-rate discharge power table, the first preset high-rate discharge power table describing a third mapping relationship between a state of charge interval, an actual battery minimum temperature, and a discharge rate; determining that the actual battery minimum temperature is greater than the first temperature threshold, automatically turning off the heating module, and determining whether the actual battery maximum temperature is greater than a second temperature threshold; terminating discharge if the actual battery maximum temperature is greater than the second temperature threshold; and discharging the battery according to a second preset high-rate discharge power table, the first preset high-rate discharge power table describing a fourth mapping relationship between a state of charge interval, an actual battery maximum temperature, and a discharge rate.

[0013] In one possible implementation, the battery discharge control strategy also includes: determining that the actual minimum battery temperature is less than or equal to 0°C, then executing: determining whether the state of charge corresponding to the battery is in a target state of charge range; if it is determined that the state of charge corresponding to the battery is in the target state of charge range, prompting the user to manually start and stop the heating module; if it is determined that the state of charge corresponding to the battery is not in the target state of charge range, discharging the battery according to a preset small-rate discharge power table, which describes a fifth mapping relationship between the state of charge range, the actual minimum battery temperature, and the discharge rate.

[0014] In the second aspect, an embodiment of the present application also provides a low-temperature heating system, which includes a battery management system, a heating module, a battery pack, a first battery temperature detection module, a second battery temperature detection module and an ambient temperature detection unit. Batteries are arranged in the battery pack, the first battery temperature detection module is arranged in the high-temperature area of ​​the battery surface, the second battery temperature detection module is arranged in the low-temperature area of ​​the battery surface, the heating module is attached to the outer surface of the battery pack, and the ambient temperature detection unit is arranged outside the battery pack. The battery management system is applied to the charging control method provided in any of the above-mentioned embodiments.

[0015] In one possible embodiment, the low-temperature heating system also includes thermal conductive adhesive and a battery insulation module. The heating module includes a heater and a heating and insulation module. Outside the battery pack, the heating and insulation module covers one side of the heater, and the other side of the heater opposite to the one side of the heater is attached to the front outer surface of the battery pack.

[0016] Inside the battery pack, thermal conductive glue is coated between the front inner surface of the battery pack and the front of the battery, and between the rear inner surface of the battery pack and the rear of the battery. Battery insulation modules are set between the left inner surface of the battery pack and the left side of the battery, and between the right inner surface of the battery pack and the right side of the battery.

[0017] The embodiment of the present application provides a charge and discharge control method and a low-temperature heating system, wherein a first battery temperature detection module is arranged in a high-temperature area on the surface of the battery, a second battery temperature detection module is arranged in a low-temperature area on the surface of the battery, a heating module is attached to the outer surface of the battery pack, and an ambient temperature detection unit is arranged outside the battery pack. The method includes: respectively collecting first temperature data corresponding to the battery fed back by the first battery temperature detection module, second temperature data corresponding to the battery fed back by the second battery temperature detection module, and ambient temperature fed back by the ambient temperature detection unit; and controlling the charge and discharge of the battery according to the first temperature data, the second temperature data, the charge and discharge status, the heating status, the ambient temperature, the battery state of charge, and the battery charge and discharge control strategy. By arranging temperature detection modules in the high and low temperature areas of the battery, the present application improves the accuracy of the detected battery temperature and improves the subsequent charge and discharge control accuracy of the battery.

[0018] This application is beneficial in that:

[0019] (1) Under normal temperature conditions, the battery temperature detection module can monitor the battery temperature more accurately, so no temperature compensation is required (the temperature compensation value is 0). Under low-temperature heating conditions, since the heater is a high-temperature heat source, it will have a significant impact on the battery temperature. Therefore, under low-temperature heating conditions, the actual battery temperature is determined by setting the battery temperature detection module in the high and low temperature areas to perform temperature compensation, so that the system can more accurately identify the battery temperature.

[0020] (2) The low-temperature heating system uses five temperature detection units, one of which is arranged outside the battery pack to monitor the ambient temperature in real time, and the other four are arranged in a V-shaped redundant pattern on the battery surface to monitor the maximum and minimum temperatures of the battery body. This arrangement method adds a dual-redundancy design. When one of the temperature detection modules has a problem, the other temperature detection module can still operate normally, allowing the battery temperature control system to be used normally.

[0021] (3) This application also provides a temperature compensation control strategy. By identifying the ambient temperature, battery body temperature and battery charge and discharge status, different temperature compensations can be performed to more accurately monitor the actual temperature of the battery cell. Moreover, by performing temperature compensation for low temperature working conditions, the consistency between the compensated temperature and the actual temperature of the battery cell can be more accurately maintained.

[0022] (4) The present application also provides a charge and discharge control strategy, which determines different battery charge and discharge rates by the high and low temperatures of the battery, which can greatly improve the life and safety of the battery cell. Most existing portable energy storage devices are not designed with low-temperature heating functions. In winter and cold areas, the use of portable energy storage is limited. In particular, in areas where the ambient temperature is below 0°C and there is a need for charging, conventional portable energy storage cannot be used for charging. In scenarios where the ambient temperature is below 0°C and there is a need for high-rate discharge, conventional portable energy storage cannot be used. The present application solves the user needs of these two scenarios, increases the scope of product use and improves the user experience.

[0023] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 One of the structural schematic diagrams of a low-temperature heating system provided in an embodiment of the present application is shown;

[0026] Figure 2 One of the flowcharts showing the steps of a charge and discharge control method provided in an embodiment of the present application;

[0027] Figure 3 The second structural diagram of a low-temperature heating system provided in an embodiment of the present application is shown;

[0028] Figure 4 A second flowchart showing the steps of a charge and discharge control method provided by the present application;

[0029] Figure 5 A flow chart of a preset temperature compensation strategy provided by an embodiment of the present application is shown;

[0030] Figure 6 A flow chart of a charging control process provided by an embodiment of the present application is shown;

[0031] Figure 7 A flow chart of a discharge control process provided by an embodiment of the present application is shown. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of illustration and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this application illustrate the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowcharts can be implemented out of sequence, and steps without logical context can be reversed or implemented simultaneously. In addition, those skilled in the art, under the guidance of the contents of this application, can add one or more other operations to the flowchart, or remove one or more operations from the flowchart.

[0033] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0034] Most portable energy storage products currently on the market lack low-temperature heating capabilities. Therefore, they do not support charging in environments below 0°C, and discharge only supports low rates. Their temperature sensors are only designed to monitor the battery cell temperature under normal temperature conditions (under normal temperature conditions, the temperature sensor is generally located at the center of the battery surface). In addition, conventional methods typically only use one set of temperature sensors to monitor the maximum and minimum battery cell temperatures. Therefore, when this arrangement is used under low-temperature heating conditions, the monitored battery temperature will deviate significantly, and if one temperature sensor fails, the entire system will fail.

[0035] Based on this, the embodiments of the present application provide a charge and discharge control method and a low-temperature heating system. By arranging temperature detection modules in the high and low temperature areas of the battery, the accuracy of the detected battery temperature is improved, thereby improving the subsequent charge and discharge control accuracy of the battery. The details are as follows:

[0036] See also Figure 1 , Figure 1 FIG1 shows one of the structural diagrams of a low temperature heating system provided in an embodiment of the present application. Figure 1As shown, the low-temperature heating system provided in the embodiment of the present application includes a heating module 1, a battery pack 2, a battery temperature detection module (including a first battery temperature detection module 3 and a second battery temperature detection module 4), an ambient temperature detection unit 5 and a battery management system BMS. A battery 6 is arranged in the battery pack 2, the first battery temperature detection module 3 is arranged in the high-temperature area of ​​the battery surface, the second battery temperature detection module 4 is arranged in the low-temperature area of ​​the battery surface, the heating module 1 is attached to the outer surface of the battery pack, and the ambient temperature detection unit 5 and the battery management system BMS are arranged outside the battery pack 2.

[0037] See also Figure 2 , Figure 2 FIG1 shows one of the flow charts of the steps of a charge and discharge control method provided in an embodiment of the present application. Figure 2 As shown, the charge and discharge control method provided in this application is applied to a battery management system BMS, including:

[0038] S100 , respectively collecting first temperature data corresponding to the battery fed back by the first battery temperature detection module, second temperature data corresponding to the battery fed back by the second battery temperature detection module, and ambient temperature fed back by the ambient temperature detection unit.

[0039] S200 , controlling the charge and discharge of the battery according to the first temperature data, the second temperature data, the charge and discharge status, the ambient temperature, the battery state of charge, and the battery charge and discharge control strategy.

[0040] In this application, the high-temperature area on the battery surface is the area in the middle of the battery surface, close to the heating module 1, and the low-temperature area on the battery surface is the area at both ends of the battery away from the heating module 1. The first battery temperature detection module 3 and the second battery temperature detection module 4 are V-shaped symmetrical with the battery center as the symmetry axis. By arranging corresponding temperature detection modules at both ends of the battery close to and away from the battery heating side, the battery low temperature and battery high temperature are obtained, thereby improving the accuracy of the battery temperature detected by the BMS. Since the battery charge and discharge rate needs to change with the temperature, the more accurate the battery temperature measurement, the more conducive it is to improving the subsequent control accuracy of the BMS on the battery charge and discharge.

[0041] See also Figure 3 , Figure 3 FIG2 shows a second structural diagram of a low temperature heating system provided by an embodiment of the present application. Figure 3As shown, the first battery temperature detection module 3 includes a first temperature detection unit 31 and a second temperature detection unit 32, and the second battery temperature detection module 4 includes a third temperature detection unit 41 and a fourth temperature detection unit 42. The first temperature detection unit 31, the second temperature detection unit 32, the third temperature detection unit 41 and the fourth temperature detection unit 42 are symmetrically arranged with the middle of the battery 6 as the axis of symmetry, forming a V-shaped symmetrical structure. The first temperature detection unit 31 and the second temperature detection unit 32 are arranged in the middle of the upper surface of the battery, close to the side of the heating module 1, and the third temperature detection unit and the fourth temperature detection unit are respectively arranged at the two ends of the battery on the upper surface of the battery away from the heating module 1.

[0042] The first temperature detection unit 31, the second temperature detection unit 32, the third temperature detection unit 41 and the fourth temperature detection unit 42 are temperature sensors. The first temperature detection unit 31 and the second temperature detection unit 32 are redundant with each other and are used to detect the maximum temperature of the battery. The third temperature detection unit 41 and the fourth temperature detection unit 42 are redundant with each other and are used to detect the minimum temperature of the battery. Since there are two temperature sensors that detect the minimum temperature and the maximum temperature of the battery at the same time, if one of the temperature sensors that detect the minimum temperature or the maximum temperature of the battery is damaged, the temperature monitoring system can still work normally to ensure that the maximum temperature and the minimum temperature of the battery are always monitored.

[0043] The first temperature data includes a first temperature T1 collected by the first temperature detection unit 31 and a second temperature T2 collected by the second temperature detection unit 32 . The second temperature data includes a third temperature T3 collected by the third temperature detection unit 41 and a fourth temperature T4 collected by the fourth temperature detection unit 42 .

[0044] In another preferred embodiment, Figure 3 As shown, the low-temperature heating system also includes a thermally conductive adhesive 7 and a battery insulation module 8. The heating module 1 includes a heater 11 and a heating and insulation module 12. Outside the battery pack 2, the heating and insulation module 12 covers one side of the heater 11, and the front outer surface of the battery pack is attached to the other side of the heater opposite to the one side of the heater 11. That is, the heater 11 is arranged between the front outer surface of the battery pack and the heating and insulation module 12, and the heating and insulation module 12 insulates the heater 11.

[0045] Inside the battery pack, thermally conductive adhesive 7 is coated between the front inner surface of the battery pack and the front of the battery, and between the rear inner surface of the battery pack and the rear of the battery. After the heater 11 starts heating, the heat is evenly distributed on the surface of the battery pack 2, and then evenly transferred to the battery body through the thermally conductive adhesive 7, causing the battery body to heat up to reach the optimal charging and discharging temperature.

[0046] A battery heat preservation module 8 is respectively arranged between the left inner surface of the battery pack and the left side of the battery, and between the right inner surface of the battery pack and the right side of the battery.

[0047] The battery charge and discharge control strategy includes a battery charge control strategy and a battery discharge control strategy. In a preferred embodiment, the battery charge and discharge control is performed in the following manner:

[0048] Based on the first temperature data and the second temperature data, the maximum temperature and the minimum temperature measured by the battery are determined, and it is determined whether to perform low-temperature heating compensation on the battery. If it is determined that low-temperature heating compensation is performed on the battery, a high-temperature compensation value and a low-temperature compensation value are determined based on the maximum temperature and the minimum temperature measured by the battery, the ambient temperature and a preset temperature compensation strategy. The high-temperature compensation value and the low-temperature compensation value are used to compensate for the battery temperature to determine the actual maximum battery temperature and the actual minimum battery temperature corresponding to the battery. The battery is charged and discharged according to the actual maximum battery temperature, the actual minimum battery temperature, the battery charging control strategy and the battery discharging control strategy.

[0049] In this application, when the battery is in a low-temperature state, there will be a large deviation between the battery temperature monitored by the battery temperature detection module and the actual battery temperature, and there will be a temperature distortion problem. Therefore, it is necessary to detect the corresponding charge and discharge status of the battery and the heating status of the heating module in real time to determine whether the battery is in a low-temperature state. Once it is determined that the battery is in a low-temperature state, it is necessary to perform temperature compensation on the temperature data collected by the battery temperature detection module to maintain the consistency between the compensated temperature and the actual battery temperature. In this way, charge and discharge control based on the compensated actual battery temperature can improve the charge and discharge control accuracy of the BMS on the battery.

[0050] In a preferred embodiment, see Figure 4 , Figure 4 The second flowchart of the steps of a charge and discharge control method provided by the present application is shown as follows: Figure 4 Shown, including:

[0051] S300 , collecting a first temperature T1 and a second temperature T2 corresponding to a high temperature region, and a third temperature T3 and a fourth temperature T4 corresponding to a low temperature region.

[0052] S301 , calculating the highest temperature G1, the lowest temperature G2, the highest temperature D1, and the lowest temperature D2 of the low temperature zone.

[0053] Among them, in step S301, the first temperature T1 and the second temperature T2 corresponding to the high temperature area are compared to determine the maximum temperature G1 and the minimum temperature G2 of the high temperature area, that is, G1 = max(T1, T2), G2 = min(T1, T2), and the third temperature and the fourth temperature corresponding to the low temperature area are compared to determine the maximum temperature D1 and the minimum temperature D2 of the low temperature area, that is, D1 = max(T3, T4), D2 = min(T3, T4).

[0054] S302 : Compare the lowest temperature G2 in the high temperature zone with the lowest temperature D2 in the low temperature zone to determine whether the lowest temperature G2 in the high temperature zone is lower than the lowest temperature D2 in the low temperature zone.

[0055] S303: Determine that the lowest temperature G2 in the high temperature zone is lower than the lowest temperature D2 in the low temperature zone, and then issue a battery temperature abnormality alarm.

[0056] S304 , determining that the lowest temperature G2 in the high temperature zone is greater than or equal to the lowest temperature D2 in the low temperature zone, and then determining the highest battery measured temperature B1 and the lowest battery measured temperature B2.

[0057] Specifically, in step S304, the battery measures a maximum temperature B1 = max(G1, D1), which represents the maximum value between the maximum temperature G1 in the high temperature zone and the maximum temperature D1 in the low temperature zone, and the battery measures a minimum temperature B2 = min(G2, D2), which represents the minimum value between the minimum temperature G2 in the high temperature zone and the minimum temperature D2 in the low temperature zone.

[0058] S305 , executing a preset temperature compensation strategy according to the maximum battery temperature B1 , the minimum battery temperature B2 , and the ambient temperature, and determining a high temperature compensation value λ1 and a low temperature compensation value λ2 .

[0059] S306 , using the high temperature compensation value λ1 and the low temperature compensation value λ2 to compensate the battery temperature, so as to determine the actual maximum battery temperature Tmax and the actual minimum battery temperature Tmin corresponding to the battery.

[0060] S307 , controlling the battery charge and discharge according to the actual battery maximum temperature Tmax, the actual battery minimum temperature Tmin, the battery charge control strategy, and the battery discharge control strategy.

[0061] In another preferred embodiment, it is determined whether the ambient temperature is less than 0°C. If the ambient temperature is greater than or equal to 0°C, the high temperature compensation value is determined to be a first preset temperature, and the low temperature compensation value is determined to be a second preset temperature. If the ambient temperature is less than 0°C, it is determined whether the lowest battery measured temperature is less than 0°C. If it is determined that the lowest battery measured temperature is less than 0°C, the high temperature compensation value is determined to be a third preset temperature, and the low temperature compensation value is determined to be a fourth preset temperature. If it is determined that the lowest battery measured temperature is greater than or equal to 0°C, the high temperature compensation value is determined to be a fifth preset temperature, and the low temperature compensation value is determined to be a sixth preset temperature.

[0062] The first preset temperature is 0°C, the second preset temperature is 0°C, the third preset temperature is -3°C, the fourth preset temperature is 1.5°C, the fifth preset temperature is -2.5°C and the sixth preset temperature is 1°C.

[0063] See also Figure 5 , Figure 5FIG. 1 shows a flow chart of a preset temperature compensation strategy provided by an embodiment of the present application. Figure 5 As shown, the preset temperature compensation strategies include:

[0064] S3051. Determine whether the ambient temperature is less than 0°C.

[0065] S3052: If the ambient temperature is greater than or equal to 0°C, set the high temperature compensation value λ1 = 0°C and the low temperature compensation value λ2 = 0°C, and execute step S3053: output the high temperature compensation value λ1 and the low temperature compensation value λ2.

[0066] S3054: If the ambient temperature is less than 0°C, determine whether the battery measured minimum temperature B2 is less than 0°C.

[0067] S3055: If it is determined that the lowest measured battery temperature B2 is less than 0°C, determine the high temperature compensation value λ1 = -3°C, the low temperature compensation value λ2 = 1.5°C, and execute step S3053.

[0068] S3056: If it is determined that the lowest measured battery temperature B2 is greater than or equal to 0°C, determine the high temperature compensation value λ1 = -2.5°C, the low temperature compensation value λ2 = 1°C, and execute step S3053.

[0069] In a preferred embodiment, step S306 includes:

[0070] A first sum value between the measured maximum battery temperature and the high temperature compensation value is calculated, and the first sum value is determined as the actual maximum battery temperature.

[0071] Preferably, the actual maximum battery temperature Tmax=B1+λ1.

[0072] A second sum value between the measured minimum battery temperature and the low temperature compensation value is calculated, and the second sum value is determined as the actual minimum battery temperature.

[0073] Preferably, the actual maximum battery temperature Tmin=B2+λ2.

[0074] In a preferred embodiment, step S307 includes:

[0075] If it is determined that the battery is in a charging state, the battery charging control strategy is executed according to the actual maximum battery temperature and the actual minimum battery temperature to control the charge and discharge of the battery. If it is determined that the battery is in a discharging state, the battery discharging control strategy is executed according to the actual maximum battery temperature and the actual minimum battery temperature to control the charge and discharge of the battery.

[0076] In a preferred embodiment, the battery charging control strategy includes:

[0077] If it is determined that the battery is in a charging state, then it is determined whether the actual minimum battery temperature is greater than 0°C. If it is determined that the actual minimum battery temperature is less than or equal to 0°C, the heating module is turned on. If it is determined that the actual minimum battery temperature is greater than 0°C, then it is determined whether the actual minimum battery temperature is greater than a first temperature threshold. If it is determined that the actual minimum battery temperature is less than or equal to the first temperature threshold, the battery is charged according to a preset small-rate charging power table. The preset small-rate charging power table describes a first mapping relationship between the state of charge interval, the actual minimum battery temperature, and the charging rate. If it is determined that the actual minimum battery temperature is greater than the first temperature threshold, the heating module is turned off. It is determined whether the actual maximum battery temperature is greater than a second temperature threshold. If it is determined that the actual maximum battery temperature is greater than the second temperature threshold, charging is terminated. If it is determined that the actual maximum battery temperature is less than or equal to the second temperature threshold, the battery is charged according to a preset large-rate charging power table. The preset large-rate charging power table describes a second mapping relationship between the state of charge interval, the actual maximum battery temperature, and the charging rate.

[0078] The first temperature threshold may be set to 10°C, and the second temperature threshold may be set to 50°C.

[0079] See also Figure 6 , Figure 6 FIG1 shows a flow chart of a charging control process provided by an embodiment of the present application. Figure 6 As shown, the charging control process of this application includes:

[0080] S400: Determine whether the actual minimum battery temperature Tmin is greater than 0°C.

[0081] S401: If it is determined that the actual minimum battery temperature Tmin is less than or equal to 0° C., the heating module is turned on and the charging process ends.

[0082] Turn on the heating module, that is, turn on the heater 11. The heating and heat preservation module 12 can be foam.

[0083] S402: Determine if the actual minimum battery temperature Tmin is greater than 0°C, then determine whether the actual minimum battery temperature Tmin is greater than 10°C.

[0084] S403: If it is determined that the actual minimum battery temperature Tmin is less than or equal to 10° C., a preset low-rate charging power table is searched according to the state of charge and the actual minimum battery temperature Tmin to determine a target charging rate for charging the battery.

[0085] For example, in one specific embodiment, a preset low-rate charging power table indicates that when the state of charge SOC ≤ 80% and the actual minimum battery temperature Tmin is 15°C, the target charging rate is determined to be 0.15C; when 80% < state of charge SOC ≤ 90% and the actual minimum battery temperature Tmin is 13°C, the target charging rate is determined to be 0.1C; when the state of charge SOC < 100% and the actual minimum battery temperature Tmin is 11°C, the target charging rate is 0.05C.

[0086] S404 , determine whether the state of charge SOC=100%.

[0087] If it is determined that the state of charge SOC=100%, the charging process is terminated; if it is determined that the state of charge SOC<100%, the process returns to step S400 .

[0088] S405: If it is determined that the actual minimum battery temperature Tmin is greater than 10° C., the heating module is turned off.

[0089] In this application, the heating module is passively started and stopped during the charging process, and is only started and stopped according to the actual minimum battery temperature Tmin monitored, and is not actively controlled by the user. When the actual minimum battery temperature Tmin≤0℃, the heating module is automatically turned on and the charging process is closed. When the actual minimum battery temperature Tmin>10℃, the heating module is automatically turned off, and the subsequent charging process is completed according to the actual minimum battery temperature Tmin and the actual maximum battery temperature Tmax.

[0090] Specifically, to prevent frequent start and stop of charging, a charging resumption threshold (e.g., 3°C) is set. That is, when the actual minimum battery temperature Tmin ≤ 0°C and the charging process is shut down, charging can only be resumed when the actual minimum battery temperature Tmin ≥ 3°C.

[0091] In this application, a coupling control method of the heating module and the self-generated heat of the battery cell is adopted. That is, the battery temperature is raised simultaneously by the heating module and the self-generated heat of the battery during charging, allowing the battery to reach the maximum charging rate temperature at the fastest temperature rise rate. The charging time is shortened by 20% compared with the non-coupling control method, which greatly improves the charging efficiency.

[0092] S406: Determine whether the actual maximum battery temperature Tmax is greater than 50°C.

[0093] If the actual maximum battery temperature Tmax is greater than 50°C, the charging process is terminated.

[0094] S407: If it is determined that the actual maximum battery temperature Tmax is less than or equal to 50° C., a preset high-rate charging power table is searched according to the state of charge and the actual maximum battery temperature Tmax to determine a target charging rate for charging the battery, and step S404 is executed.

[0095] For example, in one specific embodiment, a preset high-rate charging power table indicates that when the state of charge SOC ≤ 80% and the actual maximum battery temperature Tmax = 40°C, the target charging rate is 0.5C; when 80% < state of charge SOC ≤ 90% and the actual maximum battery temperature Tmax = 30°C, the target charging rate is 0.3C; when the state of charge SOC < 100% and the actual maximum battery temperature Tmax = 20°C, the target charging rate is 0.2C.

[0096] In a preferred embodiment, the battery discharge control strategy is:

[0097] Determining that the battery is in a discharging state, determining whether the actual battery minimum temperature is greater than a third temperature threshold, and terminating discharging if the actual battery minimum temperature is less than or equal to the third temperature threshold. Determining that the actual battery minimum temperature is greater than the third temperature threshold, determining whether the actual battery minimum temperature is greater than 0° C., determining whether the actual battery minimum temperature is greater than 0° C., determining whether the actual battery minimum temperature is greater than a first temperature threshold, and determining that the actual battery minimum temperature is less than or equal to the first temperature threshold, discharging the battery according to a first preset high-rate discharge power table, which describes a third mapping relationship between a state of charge range, an actual battery minimum temperature, and a discharge rate. Determining that the actual battery minimum temperature is greater than the first temperature threshold, automatically turning off the heating module, and determining whether the actual battery maximum temperature is greater than a second temperature threshold. If the actual battery maximum temperature is greater than the second temperature threshold, discharging is terminated. If the actual battery maximum temperature is less than or equal to the second temperature threshold, discharging the battery according to a second preset high-rate discharge power table, which describes a fourth mapping relationship between a state of charge range, an actual battery maximum temperature, and a discharge rate.

[0098] The battery discharge control strategy also includes:

[0099] If it is determined that the actual minimum battery temperature is less than or equal to 0°C, the following are executed: determining whether the state of charge corresponding to the battery is within a target state of charge range; if it is determined that the state of charge corresponding to the battery is within the target state of charge range, prompting the user to manually start and stop the heating module; if it is determined that the state of charge corresponding to the battery is not within the target state of charge range, discharging the battery according to a preset small-rate discharge power table, which describes a fifth mapping relationship between the state of charge range, the actual minimum battery temperature, and the discharge rate.

[0100] See also Figure 7 , Figure 7 FIG. 1 shows a flow chart of a discharge control process provided by an embodiment of the present application. Figure 7 As shown, the discharge control process of this application includes:

[0101] S500: Determine whether the actual minimum battery temperature Tmin is greater than -20°C.

[0102] If the actual minimum battery temperature Tmin is determined to be less than or equal to -20°C, the discharge process is terminated.

[0103] S501: Determine if the actual minimum battery temperature Tmin is greater than -20°C, then determine whether the actual minimum battery temperature Tmin is greater than 0°C.

[0104] S502: Determine if the actual minimum battery temperature Tmin is greater than 0°C, and then determine whether the actual minimum battery temperature Tmin is greater than 10°C.

[0105] S503: Determine that the actual minimum battery temperature Tmin is ≤ 10° C., and discharge the battery according to a first preset high-rate discharge power table.

[0106] In step S503, for example, the first preset high-rate discharge power table indicates that when the state of charge SOC ≥ 50% and the actual minimum battery temperature Tmin = 15°C, the target discharge rate is 0.6C; when the state of charge SOC is 30% ≤ 50% and the actual minimum battery temperature Tmin = 13°C, the target discharge rate is 0.5C; when the state of charge SOC is greater than 0% and the actual minimum battery temperature Tmin = 11°C, the target discharge rate is 0.3C.

[0107] S504 : Determine whether the state of charge (SOC) is 0%.

[0108] If the state of charge SOC=0%, the discharge process ends; if the state of charge SOC is greater than 0%, the process returns to step S500 .

[0109] S505: If it is determined that the actual minimum battery temperature Tmin is greater than 10°C, the heating module is automatically turned off.

[0110] S506: Determine whether the actual maximum battery temperature Tmax is greater than 50°C.

[0111] If the actual maximum battery temperature Tmax is greater than 50°C, the discharge process is terminated.

[0112] S507: If it is determined that the actual maximum battery temperature Tmax is less than or equal to 50° C., the battery is discharged according to the second preset high-rate discharge power table, and step S504 is executed.

[0113] In step S507, for example, the second preset high-rate discharge power table indicates that when the state of charge SOC ≥ 50% and the actual maximum battery temperature Tmax = 40°C, the target discharge rate is 0.6C; when the state of charge SOC is 30% ≤ 50% and the actual maximum battery temperature Tmax = 30°C, the target discharge rate is 0.5C; when the state of charge SOC is greater than 0% and the actual maximum battery temperature Tmax = 20°C, the target discharge rate is 0.3C.

[0114] like Figure 7 As shown, after step S501, the method further includes:

[0115] S508: Determine if the actual minimum battery temperature Tmin is less than or equal to 0° C., and then determine whether the state of charge (SOC) is greater than 65%.

[0116] S509: If it is determined that the state of charge (SOC) is greater than 65%, the user is prompted to manually start or stop the heating module.

[0117] S510: If it is determined that the state of charge SOC is ≤ 65%, determine whether the SOC is ≥ 50%.

[0118] S511 : If it is determined that the SOC is ≥ 50%, the battery is discharged according to a preset low-rate discharge power table.

[0119] If it is determined that the SOC is less than 50%, the process returns to step S505 .

[0120] For example, the preset low-rate discharge power table indicates that when the state of charge SOC ≥ 50% and the actual minimum battery temperature Tmin = 8°C, the target discharge rate is 0.2C; when the state of charge SOC is 20% ≤ < 50% and the actual minimum battery temperature Tmin = 5°C, the target discharge rate is 0.1C; when the state of charge SOC is less than 20% and the actual minimum battery temperature Tmin = 3°C, the discharge process is terminated.

[0121] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. In the several embodiments provided in this application, it should be understood that the disclosed system, device and method can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0122] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0123] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0124] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0125] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A charge and discharge control method, characterized in that: A battery management system used in a low-temperature heating system includes a heating module, a battery pack, a first battery temperature detection module, a second battery temperature detection module, and an ambient temperature detection unit. The battery pack contains batteries. The first battery temperature detection module is arranged in a high-temperature area on the battery surface. The second battery temperature detection module is arranged in a low-temperature area on the battery surface. The heating module is attached to the outer surface of the battery pack, and the ambient temperature detection unit is arranged outside the battery pack. The method comprises: respectively collecting first temperature data corresponding to the battery fed back by the first battery temperature detection module, second temperature data corresponding to the battery fed back by the second battery temperature detection module, and the ambient temperature fed back by the ambient temperature detection unit; The battery is charged and discharged according to the first temperature data, the second temperature data, the charge and discharge status, the heating status corresponding to the heating module, the ambient temperature, the battery charge status and the battery charge and discharge control strategy.

2. The method according to claim 1, characterized in that The battery charge and discharge control strategy includes battery charge control strategy and battery discharge control strategy. The battery is charged and discharged in the following manner: determining whether to perform low-temperature heating compensation on the battery according to the first temperature data and the second temperature data; If it is determined that low-temperature heating compensation is performed on the battery, determining a maximum temperature measured by the battery and a minimum temperature measured by the battery according to the first temperature data and the second temperature data; According to the maximum temperature measured by the battery, the minimum temperature measured by the battery and the ambient temperature, the preset temperature compensation strategy is executed to determine the high temperature compensation value and the low temperature compensation value; Compensating the battery temperature using the high temperature compensation value and the low temperature compensation value to determine an actual maximum battery temperature and an actual minimum battery temperature corresponding to the battery; The battery is charged and discharged according to the actual maximum battery temperature, the actual minimum battery temperature, the battery charging control strategy, the battery discharging control strategy, and the battery charging and discharging state.

3. The method according to claim 2, characterized in that The first battery temperature detection module includes a first temperature detection unit and a second temperature detection unit, and the second battery temperature detection module includes a third temperature detection unit and a fourth temperature detection unit. The first temperature detection unit, the second temperature detection unit, the third temperature detection unit and the fourth temperature detection unit are symmetrically arranged with the middle of the battery as the axis of symmetry, forming a V-shaped symmetrical structure. The first temperature detection unit and the second temperature detection unit are arranged in the middle of the upper surface of the battery, close to the side of the heating module, and the third temperature detection unit and the fourth temperature detection unit are respectively arranged at two ends of the battery on the upper surface of the battery away from the heating module. The first temperature data includes a first temperature collected by a first temperature detection unit and a second temperature collected by a second temperature detection unit, and the second temperature data includes a third temperature collected by a third temperature detection unit and a fourth temperature collected by a fourth temperature detection unit. The maximum battery temperature and the minimum battery temperature are determined by: Compare the first temperature and the second temperature corresponding to the high temperature area to determine the highest temperature and the lowest temperature of the high temperature area; Comparing the third temperature and the fourth temperature corresponding to the low temperature area to determine the maximum temperature and the minimum temperature of the low temperature area; The maximum value between the highest temperature in the high temperature zone and the highest temperature in the low temperature zone is determined as the maximum temperature measured by the battery, and the minimum value between the lowest temperature in the high temperature zone and the lowest temperature in the low temperature zone is determined as the minimum temperature measured by the battery.

4. The method according to claim 3, characterized in that Whether to perform low-temperature heating compensation on the battery is determined by the following method: comparing the lowest temperature in the high temperature zone with the lowest temperature in the low temperature zone; If it is determined that the lowest temperature in the high temperature zone is lower than the lowest temperature in the low temperature zone, an abnormal battery temperature alarm is issued; If it is determined that the lowest temperature in the high temperature zone is greater than or equal to the lowest temperature in the low temperature zone, low temperature heating compensation is performed on the battery.

5. The method according to claim 2, characterized in that The preset temperature compensation strategy includes: Determine whether the ambient temperature is less than 0°C. If the ambient temperature is greater than or equal to 0°C, determine that the high temperature compensation value is a first preset temperature and the low temperature compensation value is a second preset temperature; If the ambient temperature is less than 0°C, determining whether the lowest temperature measured by the battery is less than 0°C; If it is determined that the lowest temperature measured by the battery is less than 0°C, the high temperature compensation value is determined to be the third preset temperature, and the low temperature compensation value is determined to be the fourth preset temperature; If it is determined that the lowest measured temperature of the battery is greater than or equal to 0° C., the high temperature compensation value is determined to be a fifth preset temperature, and the low temperature compensation value is determined to be a sixth preset temperature.

6. The method according to claim 2, characterized in that The step of compensating the battery temperature by using the high temperature compensation value and the low temperature compensation value to determine the actual temperature corresponding to the battery includes: calculating a first sum of the measured maximum battery temperature and the high temperature compensation value, and determining the first sum as the actual maximum battery temperature; A second sum value between the measured minimum battery temperature and the low temperature compensation value is calculated, and the second sum value is determined as the actual minimum battery temperature.

7. The method according to claim 2, characterized in that The battery charging control strategy includes: Determining that the battery is in a charging state, then determining whether the actual minimum battery temperature is greater than 0° C.; Determining that the actual minimum battery temperature is less than or equal to 0° C., turning on the heating module; Determining that the actual minimum battery temperature is greater than 0° C., then determining whether the actual minimum battery temperature is greater than a first temperature threshold; If it is determined that the actual minimum battery temperature is less than or equal to a first temperature threshold, charging the battery according to a preset low-rate charging power table, wherein the preset low-rate charging power table describes a first mapping relationship between a state of charge interval, the actual minimum battery temperature, and a charging rate; If it is determined that the actual minimum battery temperature is greater than a first temperature threshold, the heating module is turned off, and whether the actual maximum battery temperature is greater than a second temperature threshold is determined; determining that the actual maximum battery temperature is greater than a second temperature threshold, and terminating charging; If it is determined that the actual maximum battery temperature is less than or equal to the second temperature threshold, the battery is charged according to a preset high-rate charging power table, wherein the preset high-rate charging power table describes a second mapping relationship between the state of charge interval, the actual maximum battery temperature, and the charging rate.

8. The method according to claim 2, characterized in that The battery discharge control strategy: determining that the battery is in a discharging state, and determining whether the actual minimum battery temperature is greater than a third temperature threshold; determining that the actual lowest battery temperature is less than or equal to a third temperature threshold, and then terminating the discharge; Determining that the actual minimum battery temperature is greater than a third temperature threshold, then determining whether the actual minimum battery temperature is greater than 0° C.; Determining that the actual minimum battery temperature is greater than 0° C., then determining whether the actual minimum battery temperature is greater than a first temperature threshold; If it is determined that the actual minimum battery temperature is less than or equal to a first temperature threshold, discharging the battery according to a first preset high-rate discharge power table, where the first preset high-rate discharge power table describes a third mapping relationship between state of charge intervals, the actual minimum battery temperature, and the discharge rate; If it is determined that the actual minimum battery temperature is greater than a first temperature threshold, the heating module is automatically turned off, and whether the actual maximum battery temperature is greater than a second temperature threshold is determined; If the actual maximum battery temperature is greater than a second temperature threshold, then discharging is terminated; If the actual maximum battery temperature is less than or equal to the second temperature threshold, the battery is discharged according to a second preset high-rate discharge power table, wherein the first preset high-rate discharge power table describes a fourth mapping relationship between the state of charge interval, the actual maximum battery temperature, and the discharge rate.

9. The method according to claim 8, characterized in that The battery discharge control strategy also includes: If it is determined that the actual minimum battery temperature is less than or equal to 0°C, execute: Determine whether the state of charge corresponding to the battery is within the target state of charge range; If it is determined that the state of charge corresponding to the battery is within the target state of charge range, prompting the user to manually start and stop the heating module; If it is determined that the state of charge corresponding to the battery is not in the target state of charge range, the battery is discharged according to a preset small-rate discharge power table, which describes a fifth mapping relationship between the state of charge range, the actual minimum battery temperature, and the discharge rate.

10. A low temperature heating system, characterized in that: The low-temperature heating system includes a battery management system, a heating module, a battery pack, a first battery temperature detection module, a second battery temperature detection module and an ambient temperature detection unit. The battery pack is provided with a battery, the first battery temperature detection module is arranged in a high-temperature area on the surface of the battery, the second battery temperature detection module is arranged in a low-temperature area on the surface of the battery, the heating module is attached to the outer surface of the battery pack, and the ambient temperature detection unit is arranged outside the battery pack. The battery management system is applied to the charge and discharge control method described in any one of claims 1 to 9 above.

11. The low temperature heating system according to claim 10, characterized in that: The low-temperature heating system also includes a thermally conductive adhesive and a battery insulation module. The heating module includes a heater and a heating and insulation module. Outside the battery pack, the heating and insulation module covers one side of the heater, and the front outer surface of the battery pack is attached to the other side of the heater opposite to the one side of the heater. Inside the battery pack, thermal conductive glue is coated between the front inner surface of the battery pack and the front of the battery, and between the rear inner surface of the battery pack and the rear of the battery. The battery insulation module is respectively arranged between the left inner surface of the battery pack and the left side of the battery, and between the right inner surface of the battery pack and the right side of the battery.

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