Power supply temperature control method and system for dynamic capacity increasing device of power transmission line

Abstract

The invention discloses a power supply temperature control method and system for a dynamic capacity increasing device of a power transmission line, and the method comprises the steps: collecting data of a target storage battery, and comparing the temperature in a battery compartment with a battery safety charging temperature range; a temperature control mode is switched according to the temperature in the battery compartment, and a storage battery power supply circuit is controlled; the temperature change rate is analyzed, storage battery fault detection and alarm are carried out, and storage battery charging temperature control is achieved. According to the method, only the circuit part is adjusted, external parts do not need to be additionally arranged, the method is suitable for a solar charging circuit, and the requirements of power transmission line online monitoring equipment for miniaturization and low power consumption can be fully met. The simplified structure can ensure the safety and reliability of the power supply system in an extreme environment. According to actual safe charging temperature ranges of different types of lithium ion batteries produced by different manufacturers, threshold values meeting requirements can be set, and accurate control over the charging temperature of the batteries is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery charging temperature control, and in particular to a power supply temperature control method and system for a dynamic capacity increasing device for a power transmission line. Background Art

[0002] The dynamic capacity expansion technology of transmission lines is an effective method to increase the capacity of existing transmission lines. This method uses a dynamic capacity expansion online monitoring device to monitor the physical characteristics and environmental parameters of the line in real time. Due to the particularity of the transmission line environment, it is inconvenient to obtain energy, so the monitoring devices installed on the line are mostly powered by solar panels + batteries.

[0003] Lithium-ion batteries are the most common energy storage units in off-grid photovoltaic power generation systems, and their charging temperature range is between 0℃ and 45℃. From the perspective of actual application, battery damage caused by over-temperature charging has become an important constraint on the application of lithium-ion batteries as photovoltaic energy storage in outdoor high-temperature environments. Therefore, solving the problem of lithium-ion battery damage caused by over-temperature charging is of great practical significance.

[0004] The current existing technology mainly starts from two aspects: temperature control of the battery charging environment and control of the battery charging process, to prevent lithium-ion batteries from continuing to charge in an environment with unsafe charging temperatures. Among them, the temperature control of the battery charging environment mostly relies on the setting of heating / heat dissipation components to regulate the temperature of the environment. It is an indirect solution, involving many components, and the regulation process is relatively complicated. This method cannot accurately control the charging temperature of the battery within the safe charging temperature range of each battery. The control of the battery charging process is to monitor the temperature of the battery during the charging process and select the appropriate working mode according to different temperatures. In the prior art, there is a method of determining the charging operation parameters through the initial battery state parameters of the lithium battery, judging whether it is abnormal according to the collected charging temperature, and setting the appropriate charging mode for the abnormal battery. The judgment and setting method of this method is complicated, and the strategy of continuing to charge the battery with abnormal temperature is still adopted. It is impossible to clarify the degree of damage to the battery at this time. There are still hidden dangers in solving the problem of lithium-ion battery charging damage beyond the temperature range.

[0005] Therefore, it is urgent to design a battery charging temperature control method and system suitable for an online monitoring device for dynamic capacity expansion of a transmission line. Summary of the invention

[0006] In view of the above-mentioned problems, the present invention is proposed.

[0007] Therefore, the technical problem solved by the present invention is that the prior art still has hidden dangers in solving the problem of lithium-ion batteries being damaged by charging beyond the temperature range.

[0008] To solve the above technical problems, the present invention provides the following technical solutions: a power supply temperature control method for a dynamic capacity expansion device of a power transmission line, comprising: collecting data of a target battery, comparing the temperature in a battery compartment and the safe charging temperature range of the battery; switching the temperature control mode according to the temperature in the battery compartment to control the battery power supply circuit; analyzing the temperature change rate, performing battery fault detection and alarm, and realizing battery charging temperature control.

[0009] As a preferred solution of the battery charging temperature control method described in the present invention, the data of the target battery includes battery data, temperature data in the battery compartment, environmental data and historical data.

[0010] As a preferred embodiment of the battery charging temperature control method of the present invention, the battery safe charging temperature range includes setting the initial battery safe charging temperature range [T l , T h ], collect the temperature T in the battery compartment through the temperature sensor d With [T l , T h ] for comparison, when T d Does not belong to [T l , T h ] range, switch the temperature control mode.

[0011] As a preferred solution of the battery charging temperature control method of the present invention, the temperature control mode includes an overheating mode and an undertemperature mode. d >T h Switch to overheat mode, immediately disconnect the battery power supply circuit, and adjust the ambient temperature T w Monitor and calculate the battery safe charging temperature range ΔT, expressed as:

[0012] ΔT=T h -T l

[0013] When T w ≥T h When T h -0.1ΔT≤T w <T h When the over-temperature hysteresis temperature θT is set in advance h , if the temperature inside the battery compartment is T d >T h -θT h , the battery power supply circuit remains disconnected. If the temperature inside the battery compartment drops to T d ≤T h -1.1θT h, the battery power supply circuit is controlled to close again and the battery is restored to normal charging; when T w <T h When -0.1ΔT, if the temperature inside the battery compartment is T d ≤T h -θT h , then the battery power supply circuit is controlled to close again and the battery is restored to normal charging.

[0014] As a preferred solution of the battery charging temperature control method of the present invention, the under-temperature mode includes: when T d <T l Switch to under-temperature mode, immediately disconnect the battery power supply circuit, and adjust the ambient temperature T w Monitor; when T w ≤T l When T l <T w <T l +0.1ΔT, according to the pre-set under-temperature hysteresis temperature θT l , if the temperature inside the battery compartment is T d <T l +θT l , the battery power supply circuit remains disconnected. If the temperature inside the battery compartment rises to T d ≥T l +θT l , the battery power supply circuit is controlled to close again and the battery is restored to normal charging; when T w ≥T l +0.1ΔT, if the temperature inside the battery compartment rises to T d >T l , then the battery power supply circuit is controlled to close again and the battery is restored to normal charging.

[0015] As a preferred solution of the battery charging temperature control method of the present invention, wherein: analyzing the temperature change rate includes calculating the temperature rise rate v under normal conditions according to the battery data T , expressed as:

[0016]

[0017] Where P represents power; t represents charging time; C represents battery heat capacity; m represents battery mass; I represents charging current; R represents resistance; based on the fluctuation of temperature rise under normal charging conditions in historical data, the threshold value θv of the temperature rise rate is set. T Each time the battery power supply circuit is disconnected and reclosed, select the data in the time window of size H before disconnection and after reclosing, and calculate the temperature rise rate v T, perform fault detection.

[0018] As a preferred solution of the battery charging temperature control method of the present invention, the fault detection and alarm includes, when the battery voltage exceeds the safe charging voltage range, immediately disconnecting the charging circuit and entering the over-temperature mode. T <θv T If the battery voltage is less than the minimum value of the safe charging voltage range, try to reclose the power supply circuit. If the battery voltage returns to the safe charging voltage range after reclosing, it is judged as voltage fluctuation and no alarm is issued. If the reclosing fails or the battery voltage is still less than the minimum value of the safe charging voltage range after reclosing, it is judged as a circuit breaker fault, and the battery power supply circuit is immediately disconnected and a circuit breaker alarm is issued, and the automatic closing function of the battery power supply circuit is locked; if v T ≥θv T If the battery voltage is greater than the maximum value of the safe charging voltage range, the battery is judged to be overcharged, an overcharge alarm is issued, the battery power supply circuit is disconnected, and the automatic closing function of the battery power supply circuit is locked; if v T ≥2θv T When the battery is short-circuited, it is judged that there is an internal short circuit in the battery, a battery short circuit alarm is issued, the battery power supply circuit is disconnected, and the automatic closing function of the battery power supply circuit is locked.

[0019] In a second aspect, the present invention also provides a battery charging temperature control system, including a data acquisition module, which collects data of a target battery through a sensor; a temperature control module, which switches between an over-temperature mode and an under-temperature mode according to the temperature in the battery compartment, and controls the disconnection and reclosing of a battery power supply circuit in combination with the ambient temperature; a fault detection module, which detects the charging voltage of the battery, calculates the temperature rise rate after each disconnection and reclosing of the battery power supply circuit, and performs fault detection and early warning.

[0020] In a third aspect, the present invention further provides a computing device, comprising: a memory and a processor;

[0021] The memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions. When the computer executable instructions are executed by the processor, the steps of the battery charging temperature control method are implemented.

[0022] In a fourth aspect, the present invention further provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the steps of the battery charging temperature control method.

[0023] Beneficial effects of the present invention: The method of the present invention only adjusts the circuit part, without adding any external components, and is suitable for solar charging circuits, which can fully meet the requirements of online monitoring equipment for power transmission lines for miniaturization and low power consumption. The simplified structure can ensure the safety and reliability of the power supply system in extreme environments. It can set a threshold value that meets the requirements according to the actual safe charging temperature range of lithium-ion batteries of different types and manufacturers, so as to achieve precise control of the battery charging temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0025] Figure 1 An overall flow chart of a power supply temperature control method for a power transmission line dynamic capacity increasing device provided by one embodiment of the present invention;

[0026] Figure 2 A schematic diagram of the structure of a control device for a power supply temperature control method of a power transmission line dynamic capacity increasing device provided in a second embodiment of the present invention;

[0027] Figure 3 A simplified temperature control mode switching flow chart of a power supply temperature control method for a power transmission line dynamic capacity expansion device provided in a second embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0029] Example 1

[0030] Reference Figure 1 , which is an embodiment of the present invention, provides a power supply temperature control method for a dynamic capacity increasing device of a power transmission line, comprising:

[0031] S1: Collect data of the target battery and compare the temperature inside the battery compartment with the safe charging temperature range of the battery.

[0032] Furthermore, the battery data, the temperature data in the battery compartment and the environmental data are collected in real time through sensors, and the temperature, voltage, current and other data of the battery under normal conditions in the historical data are retrieved for fault detection.

[0033] According to the battery model and actual safe charging temperature in the battery compartment, set the initial battery safe charging temperature range [T l , T h ], collect the temperature T in the battery compartment through the temperature sensor d With [T l , T h ] for comparison, when T d Does not belong to [T l , T h ] range, switch the temperature control mode.

[0034] Furthermore, the disconnection and reclosing of the battery power supply circuit are controlled by the switch unit, and the switch unit selects a MOS tube to execute the signal instructions of disconnection and reclosing. It should be noted that the method of the present invention does not set up additional heating / heat dissipation components, and only realizes the temperature control function by making partial adjustments to the circuit. Therefore, a MOS tube that can quickly disconnect and close the circuit is selected as the switch unit, which can quickly respond to disconnect the circuit in emergency situations such as overcharging and internal short circuit of the battery to prevent the damage from expanding.

[0035] In actual applications, the most common factor that damages batteries is over-temperature charging. The low resistance of the MOS tube in the on state helps reduce power consumption and heat. Secondly, the normal charging temperature of lithium-ion batteries is usually recommended to be between 0℃ and 45℃, while the operating temperature range of most commercial-grade MOS tubes is approximately from -55℃ to +150℃, which is much larger than the operating temperature range of batteries, ensuring long-term stable operation and reliability.

[0036] S2: Switch the temperature control mode according to the temperature in the battery compartment to control the battery power supply circuit.

[0037] Furthermore, the temperature control mode includes overheating mode and underheating mode. d >T h Switch to overheat mode, immediately disconnect the battery power supply circuit, and adjust the ambient temperature T w Monitor and calculate the battery safe charging temperature range ΔT, expressed as:

[0038] ΔT=T h -T l

[0039] When T w ≥T h Keep the battery power supply circuit disconnected.

[0040] When T h -0.1ΔT≤T w <T h When the over-temperature hysteresis temperature θT is set in advance h , if the temperature inside the battery compartment is T d >T h -θT h , the battery power supply circuit remains disconnected. If the temperature inside the battery compartment drops to T d ≤T h -1.1θT h , then the battery power supply circuit is controlled to close again and the battery is restored to normal charging.

[0041] When T w <T h When -0.1ΔT, if the temperature inside the battery compartment is T d ≤T h -θT h , then the battery power supply circuit is controlled to close again and the battery is restored to normal charging.

[0042] It should be noted that the hysteresis temperature mainly controls the closing of the switch unit. When the temperature in the warehouse rises back to the safe charging range of the battery, taking the normal safe charging range of 0℃-45℃ and the hysteresis temperature of 5℃ as an example, if the temperature is found to be lower than 45℃, it is not overheated at this time, but the switch unit is not immediately controlled to close, because the temperature drop has not stabilized at this time. It is very likely that it will be lower than 45℃ in one second and rise to above 45℃ in the next second. Therefore, according to the preset hysteresis temperature, the switch unit will not be closed until the temperature reaches 40℃.

[0043] Furthermore, when T d <T l Switch to under-temperature mode, immediately disconnect the battery power supply circuit, and adjust the ambient temperature T w Conduct monitoring.

[0044] When T w ≤T l Keep the battery power supply circuit disconnected.

[0045] When T l <T w <T l +0.1ΔT, according to the pre-set under-temperature hysteresis temperature θT l , if the temperature inside the battery compartment is T d <T l +θT l , the battery power supply circuit remains disconnected. If the temperature inside the battery compartment rises to T d ≥T l +θT l, then the battery power supply circuit is controlled to close again and the battery is restored to normal charging.

[0046] When T w ≥T l +0.1ΔT, if the temperature inside the battery compartment rises to T d >T l , then the battery power supply circuit is controlled to close again and the battery is restored to normal charging.

[0047] It should be noted that under normal circumstances, the charging process will generate a certain amount of heat, causing the temperature inside the battery compartment to rise. This is because the electrochemical reaction during the charging process will generate heat energy. In other words, when the outside temperature rises back to the battery safe charging temperature range, and is not very close to the minimum value of the battery safe charging temperature, as long as the temperature inside the battery compartment rises back to the battery safe charging temperature range, the power supply circuit can be restored to charge the battery.

[0048] Similarly, considering the temperature rise caused by battery charging, when the external temperature is close to the maximum value of the battery's safe charging temperature, the hysteresis temperature value needs to be increased to cope with temperature fluctuations.

[0049] It should also be noted that, whether in over-temperature mode or under-temperature mode, the battery compartment temperature is restored by disconnecting the battery charging circuit, because no matter whether the temperature is higher than the safe charging range or lower than the safe charging range, it is not allowed to continue charging the battery at this time. Continuing charging will damage the battery, so the battery charging circuit is disconnected to protect the battery. After the ambient temperature in the warehouse recovers to a temperature that can be safely charged, charging can be carried out. Under normal circumstances, the temperature in the warehouse is affected by the temperature rise of the battery charging and the ambient temperature. After the charging circuit is disconnected, the ambient temperature in the warehouse has nothing to do with the circuit itself. The circuit itself does not affect the temperature of the environment in the warehouse. The temperature of the environment in the warehouse is constantly changing with the changes in the external environment. For example, the temperature will rise when the sun is shining during the day in summer, and the temperature will drop at night.

[0050] S3: Analyze the temperature change rate, perform battery fault detection and alarm, and realize battery charging temperature control.

[0051] Furthermore, the temperature rise rate v under normal conditions is calculated based on the battery data. T , expressed as:

[0052]

[0053] Where P represents power; t represents charging time; C represents battery heat capacity; m represents battery mass; I represents charging current; R represents resistance; based on the fluctuation of temperature rise under normal charging conditions in historical data, the threshold value θv of the temperature rise rate is set. TEach time the battery power supply circuit is disconnected and reclosed, select the data in the time window of size H before disconnection and after reclosing, and calculate the temperature rise rate v T , perform fault detection.

[0054] It should be noted that when the outside temperature is relatively stable, the heating rate in the battery compartment is only affected by the heat dissipated during the battery charging process. Therefore, it is assumed that the battery is the only heat source in the battery compartment, and the thermal capacity and mass of the battery are used to calculate v T It can reflect the heating rate of the battery compartment.

[0055] According to the battery charging voltage and the calculated temperature rise rate, fault detection and alarm are carried out. When the battery voltage exceeds the safe charging voltage range during battery charging, the charging circuit is immediately disconnected and the over-temperature mode is entered. T <θv T If the battery voltage is lower than the minimum value of the safe charging voltage range, try to reclose the power supply circuit. If the battery voltage returns to the safe charging voltage range after reclosing, it is judged as voltage fluctuation and no alarm is issued. If the reclosing fails or the battery voltage is still lower than the minimum value of the safe charging voltage range after reclosing, it is judged as a circuit breaker fault, and the battery power supply circuit is immediately disconnected and a circuit breaker alarm is issued, and the automatic closing function of the battery power supply circuit is locked.

[0056] If v T ≥θv T If the battery voltage is greater than the maximum value of the safe charging voltage range, the battery is judged to be overcharged, an overcharge alarm is issued, the battery power supply circuit is disconnected, and the automatic closing function of the battery power supply circuit is locked.

[0057] If v T ≥2θv T When the battery is short-circuited, it is judged that there is an internal short circuit in the battery, a battery short circuit alarm is issued, the battery power supply circuit is disconnected, and the automatic closing function of the battery power supply circuit is locked.

[0058] The present embodiment also provides a power supply temperature control system for a dynamic capacity expansion device for a power transmission line, including a data acquisition module, which acquires data of a target battery through a sensor; a temperature control module, which switches between an over-temperature mode and an under-temperature mode according to the temperature in the battery compartment, and controls the disconnection and reclosing of a battery power supply circuit in combination with the ambient temperature; a fault detection module, which detects the charging voltage of the battery, calculates the temperature rise rate after each disconnection and reclosing of the battery power supply circuit, and performs fault detection and early warning.

[0059] This embodiment also provides a computing device, including a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions to implement the battery charging temperature control method proposed in the above embodiment.

[0060] This embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, the battery charging temperature control method proposed in the above embodiment is implemented.

[0061] The storage medium proposed in this embodiment and the battery charging temperature control method proposed in the above embodiment belong to the same inventive concept. The technical details not fully described in this embodiment can be referred to the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0062] Through the above description of the implementation method, the technicians in the relevant field can clearly understand that the present invention can be implemented by means of software and necessary general hardware, and of course it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ReadOnly, Memory, ROM), random access memory (RandomAccessMemory, RAM), flash memory (FLASH), hard disk or optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform the methods of various embodiments of the present invention.

[0063] Example 2

[0064] Reference Figure 2 and Figure 3 , which is an embodiment of the present invention, provides a power supply temperature control method for a dynamic capacity expansion device of a transmission line. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through simulation experiments.

[0065] like Figure 2 The figure is a schematic diagram of the structure of the control device provided by the present invention, wherein the photovoltaic unit is composed of a photovoltaic panel and a photovoltaic collection chip control circuit, which converts light energy into electrical energy and adjusts it before outputting it to the battery unit.

[0066] The switch unit is a MOS tube, which is used to execute the signal instruction of the temperature control unit, thereby shutting down and closing the power supply line from the photovoltaic unit to the battery unit. The signal instruction is generated and sent through the judgment of the over-temperature mode and the under-temperature mode and the mode switching.

[0067] The battery cell is a primary battery, including ternary lithium, lithium iron phosphate or lithium titanate.

[0068] like Figure 3 As shown, it is a simplified judgment flow chart of the switching of the temperature control mode, without considering the influence of the external ambient temperature, and only judging the switching of the temperature control mode through the temperature in the battery compartment. In this embodiment, the safe charging temperature range of the battery is preset to 0°C to 45°C. Within this temperature range, the switch unit is closed, and the photovoltaic charges the battery at this time. Once the temperature control unit detects that the temperature is not within this range, the switch unit is disconnected, and the photovoltaic does not charge the battery at this time; the hysteresis temperature is preset to ±5°C, therefore, the temperature for resuming charging is 0+5=5°C and 45-5=40°C. In the overheating or under-temperature mode, once the charging recovery temperature is reached, the switch unit is closed again to charge the battery.

[0069] Compared with the prior art, the present invention has a simple structure and only requires adjustments to the circuit part without the need for additional external components. It is suitable for solar charging circuits and can fully meet the requirements of online monitoring equipment for transmission lines for miniaturization and low power consumption.

[0070] It is suitable for online monitoring devices of dynamic capacity increase of transmission lines. It can ensure the safety and reliability of the power supply system in special environments such as high temperature in summer, thermal effect of solar light and Joule heating effect of conductors, icing of lines in winter, and interference from various electromagnetic effects.

[0071] It can set a threshold value that meets the requirements according to the actual safe charging temperature range of lithium-ion batteries of different types and produced by different manufacturers, so as to achieve precise control of the battery charging temperature.

[0072] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A power supply temperature control method for a dynamic capacity expansion device for a power transmission line, characterized in that: include: Collect data of the target battery and compare the temperature inside the battery compartment with the safe charging temperature range of the battery; Switch the temperature control mode according to the temperature in the battery compartment to control the battery power supply circuit; Analyze the temperature change rate, perform battery fault detection and alarm, and realize battery charging temperature control.

2. The battery charging temperature control method according to claim 1, characterized in that: The data of the target battery includes battery data, temperature data in the battery compartment, environmental data and historical data.

3. The battery charging temperature control method according to claim 2, characterized in that: The battery safe charging temperature range includes setting the initial battery safe charging temperature range [T l , T h ], collect the temperature T in the battery compartment through the temperature sensor d With [T l , T h ] for comparison, when T d Does not belong to [T l , T h ] range, switch the temperature control mode.

4. The battery charging temperature control method according to claim 3, characterized in that: The temperature control mode includes overheating mode and underheating mode. d >T h Switch to overheat mode, immediately disconnect the battery power supply circuit, and adjust the ambient temperature T w Monitor and calculate the battery safe charging temperature range ΔT, expressed as: ΔT=T h -T l When T w ≥T h Keep the battery power supply circuit disconnected; When T h -0.1ΔT≤T w <T h When the over-temperature hysteresis temperature θT is set in advance h , if the temperature inside the battery compartment is T d >T h -θT h , the battery power supply circuit remains disconnected. If the temperature inside the battery compartment drops to T d ≤T h -1.1θT h , then the battery power supply circuit is controlled to close again and the battery is restored to normal charging; When T w <T h When -0.1ΔT, if the temperature inside the battery compartment is T d ≤T h -θT h , then the battery power supply circuit is controlled to close again and the battery is restored to normal charging.

5. The battery charging temperature control method according to claim 4, characterized in that: The under-temperature mode includes when T d <T l Switch to under-temperature mode, immediately disconnect the battery power supply circuit, and adjust the ambient temperature T w Conduct monitoring; When T w ≤T l Keep the battery power supply circuit disconnected; When T l <T w <T l +0.1ΔT, according to the pre-set under-temperature hysteresis temperature θT l , if the temperature inside the battery compartment is T d <T l +θT l , the battery power supply circuit remains disconnected. If the temperature inside the battery compartment rises to T d ≥T l +θT l , then the battery power supply circuit is controlled to close again and the battery is restored to normal charging; When T w ≥T l +0.1ΔT, if the temperature inside the battery compartment rises to T d >T l , then the battery power supply circuit is controlled to close again and the battery is restored to normal charging.

6. The battery charging temperature control method according to claim 5, characterized in that: Analyzing the temperature change rate includes calculating the temperature rise rate v under normal conditions based on the battery data. T , expressed as: Where P represents power; t represents charging time; C represents battery heat capacity; m represents battery mass; I represents charging current; R represents resistance; based on the fluctuation of temperature rise under normal charging conditions in historical data, the threshold value θv of the temperature rise rate is set. T Each time the battery power supply circuit is disconnected and reclosed, select the data in the time window of size H before disconnection and after reclosing, and calculate the temperature rise rate v T , perform fault detection.

7. The battery charging temperature control method according to claim 6, characterized in that: The fault detection and alarm includes, when the battery voltage exceeds the safe charging voltage range, immediately disconnecting the charging circuit and entering the over-temperature mode. T <θv T If the battery voltage is less than the minimum value of the safe charging voltage range, try to reclose the power supply circuit. If the battery voltage returns to the safe charging voltage range after reclosing, it is judged as voltage fluctuation and no alarm is issued. If the reclosing fails or the battery voltage is still less than the minimum value of the safe charging voltage range after reclosing, it is judged as a circuit breaker fault, the battery power supply circuit is immediately disconnected and a circuit breaker alarm is issued, and the automatic closing function of the battery power supply circuit is locked; If v T ≥θv T If the battery voltage is greater than the maximum value of the safe charging voltage range, the battery is judged to be overcharged, an overcharge alarm is issued, the battery power supply circuit is disconnected, and the automatic closing function of the battery power supply circuit is locked; If v T ≥2θv T When the battery is short-circuited, it is judged that there is an internal short circuit in the battery, a battery short circuit alarm is issued, the battery power supply circuit is disconnected, and the automatic closing function of the battery power supply circuit is locked.

8. A battery charging temperature control system using the method as claimed in any one of claims 1 to 7, characterized in that: include, Data acquisition module, collects data of target battery through sensors The temperature control module switches between the over-temperature mode and the under-temperature mode according to the temperature in the battery compartment, and controls the disconnection and re-closing of the battery power supply circuit in combination with the ambient temperature; The fault detection module detects the charging voltage of the battery, calculates the temperature rise rate after each battery power supply circuit is disconnected and reopened, and performs fault detection and early warning.

9. A computing device comprising: Memory and processor; The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions. When the computer-executable instructions are executed by the processor, the steps of the method described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions, when executed by a processor, implement the steps of the method according to any one of claims 1 to 7.

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