Temperature sensing type air cooling driving circuit and battery module

Abstract

The utility model discloses a temperature sensing type air cooling drive circuit and a battery module, and belongs to the technical field of battery heat dissipation. The temperature sensing type air cooling driving circuit comprises a temperature switch, a transmission module and a switch module. The first end of the temperature switch is connected with a first power signal, and the second end of the temperature switch is connected with the control end of the transmission module. The input end of the transmission module is connected with a switch control signal, and the output end of the transmission module is connected with the control end of the switch module; and the input end of the switch module is connected with a driving power supply signal, and the output end of the switch module is connected with a motor of the cooling fan in the battery module. According to the embodiment of the utility model, air exhaust and heat dissipation can be carried out on the battery module in time, and meanwhile, the energy-saving effect is considered.

Description

Technical Field

[0001] The utility model relates to the technical field of battery heat dissipation, and in particular to a temperature-sensitive air-cooled drive circuit and a battery module. Background Art

[0002] At present, to solve the safety problem of electrochemical energy storage systems, such as lithium battery energy storage systems, the first point is to solve the safety problem of battery discharge and heating. When the battery is discharged, a large amount of heat is released. If cooling measures are not taken in time and effectively, it will cause battery damage or explosion, and even cause fire in serious cases. Utility Model Content

[0003] The utility model provides a temperature-sensitive air-cooled driving circuit and a battery module, which can exhaust and dissipate heat from the battery module in a timely manner while taking into account the energy-saving effect.

[0004] In a first aspect, an embodiment of the utility model provides a temperature-sensitive air-cooling drive circuit, characterized in that it includes: a temperature switch, a transmission module and a switch module;

[0005] The first end of the temperature switch is connected to the first power signal, and the second end of the temperature switch is connected to the control end of the transmission module; the temperature switch is used to control whether the first end and the second end of the temperature switch are connected according to the temperature of the battery pack in the battery module;

[0006] The input end of the transmission module is connected to the switch control signal, and the output end of the transmission module is connected to the control end of the switch module; the transmission module is used to control whether the input end and the output end of the transmission module are connected according to the level of the control end of the transmission module;

[0007] The input end of the switch module is connected to a driving power signal, and the output end of the switch module is connected to the motor of the cooling fan in the battery module; the switch module is used to control whether the input end and the output end of the switch module are connected according to the level of the control end of the switch module.

[0008] Optionally, the transmission module includes: an optocoupler and a first resistor; the first end of the first resistor is connected to the second power supply signal, the first end of the light source of the optocoupler is connected to the second end of the first resistor, the second end of the light source of the optocoupler is connected to the control end of the transmission module, the first end of the light receiver of the optocoupler is connected to the input end of the transmission module, and the second end of the light receiver of the optocoupler is connected to the output end of the transmission module.

[0009] Optionally, the switch module includes: a transistor and a second resistor; the first end of the second resistor is connected to the control end of the switch module, the control electrode of the transistor is connected to the second end of the second resistor, the first electrode of the transistor is connected to the input end of the switch module, and the second electrode of the transistor is connected to the output end of the switch module.

[0010] Optionally, the switch module further includes: a third resistor; a first end of the third resistor is connected to the driving power signal, and a second end of the third resistor is connected to the control electrode of the transistor.

[0011] Optionally, the temperature-sensing air-cooling drive circuit further includes: a fourth resistor; the output end of the switch module is connected to the first end of the motor of the cooling fan, the second end of the motor of the cooling fan is connected to the first end of the fourth resistor, and the second end of the fourth resistor is grounded.

[0012] Optionally, the temperature-sensitive air-cooling drive circuit further includes: a freewheeling diode connected in parallel between the first end and the second end of the motor of the cooling fan.

[0013] Optionally, the control end of the transmission module is also connected to the controller in the battery module, and the transmission module is also used to control whether the input end and the output end of the transmission module are connected according to the driving control signal output by the controller.

[0014] Optionally, the temperature-sensing air-cooling drive circuit includes a plurality of the temperature switches; the plurality of temperature switches are respectively arranged at different positions of the battery pack.

[0015] In the second aspect, an embodiment of the utility model further provides a battery module, comprising: a battery pack, at least one cooling fan and at least one temperature-sensing air-cooling drive circuit as provided in any embodiment of the utility model; the motor of each cooling fan is connected to at least one temperature-sensing air-cooling drive circuit.

[0016] Optionally, the battery module includes a plurality of the temperature-sensing air-cooling drive circuits, and each of the temperature switches in the plurality of the temperature-sensing air-cooling drive circuits is arranged at a different position of the battery pack.

[0017] In the temperature-sensing air-cooling drive circuit provided by the embodiment of the utility model, the temperature of the battery pack is sensed by the temperature switch, and the temperature switch can be directly actuated according to the temperature, and the signal output by the temperature switch directly acts on the transmission module, thereby realizing the on-off control of the switch module. In this way, it is equivalent to integrating the temperature sensing device and the switch control device together. Compared with using a separate temperature sensing device to detect the temperature and then performing heat dissipation-related control through the data processing and task issuing of the processor, the embodiment of the utility model can sense the temperature of the battery pack more directly and quickly, and react immediately when the battery pack is discharged and heated, and perform exhaust and heat dissipation. In addition, based on the working characteristics of the temperature switch, it can automatically restore the initial state after the battery pack temperature drops to its threshold temperature to stop the air cooling cycle. The threshold temperature of the temperature switch serves as the start-up condition of the heat dissipation fan and also as the shutdown condition of the heat dissipation fan, so that the temperature-sensing air-cooling drive circuit can timely control the heat dissipation fan to stop running when the battery pack temperature falls back to a safe range, avoiding unnecessary energy consumption and achieving energy saving effect. Therefore, the temperature-sensing air-cooling drive circuit provided in the embodiment of the utility model can quickly sense the temperature changes of the battery pack in the battery module, has high reliability, strong real-time performance, and quick action response, and can exhaust and dissipate heat in time while taking into account the energy-saving effect.

[0018] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present utility model, nor are they intended to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a structural schematic diagram of a temperature-sensitive air-cooling drive circuit provided by an embodiment of the utility model;

[0021] Figure 2 It is a structural schematic diagram of another temperature-sensitive air-cooling drive circuit provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0024] In recent years, fires in power storage systems at home and abroad have aroused widespread concern about battery energy storage systems. Taking lithium battery energy storage systems as an example, according to incomplete statistics, more than 30 lithium battery energy storage fire safety accidents have occurred worldwide in the past year, causing significant property losses. Therefore, after the cost of batteries has been reduced to the turning point of commercialization, the safety of energy storage systems has become a key bottleneck restricting the large-scale promotion of battery power storage. At present, the solutions used in related technologies to solve the problem of heat accumulation in batteries are not energy-efficient enough, and the perception and response to the battery pack temperature are not fast enough.

[0025] To solve the above problems, an embodiment of the utility model provides a pack (battery module) level temperature-sensing air-cooling drive circuit to quickly sense the temperature changes of the battery pack in the battery module and control the start and stop of the cooling fan accordingly. Figure 1 This is a schematic diagram of the structure of a temperature-sensitive air-cooling drive circuit provided by an embodiment of the utility model. Figure 1 The temperature-sensitive air-cooling drive circuit includes: a temperature switch 10, a transmission module 20 and a switch module 30. Exemplarily, the battery pack of the battery module may include a plurality of battery cells connected in series and parallel. The battery pack may specifically be a lithium battery pack.

[0026] Among them, the first end 11 of the temperature switch 10 is connected to the first power supply signal V1, and the second end 12 of the temperature switch 10 is connected to the control end 21 of the transmission module 20; the input end 22 of the transmission module 20 is connected to the switch control signal V2, and the output end 23 of the transmission module 20 is connected to the control end 31 of the switch module 30; the input end 32 of the switch module 30 is connected to the driving power supply signal VS, and the output end 33 of the switch module 30 is connected to the motor M1 of the cooling fan in the battery module.

[0027] In the temperature-sensing air-cooling driving circuit, the temperature switch 10 is used to control whether the first end 11 and the second end 12 of the temperature switch 10 are connected according to the temperature of the battery pack in the battery module, so as to control whether the first power signal V1 is transmitted to the control end 21 of the transmission module 20. The transmission module 20 is used to control whether the input end 22 and the output end 23 of the transmission module 20 are connected according to the level of the control end 21 of the transmission module 20, so as to control whether the switch control signal V2 is transmitted to the control end 31 of the switch module 30. The switch module 30 is used to control whether the input end 32 and the output end 33 of the switch module 30 are connected according to the level of the control end 31 of the switch module 30, so as to control whether the motor M1 of the cooling fan is powered on.

[0028] The temperature switch 10 may be a normally open temperature switch, which may be disposed on the outer wall of the battery pack to sense the temperature of the battery pack. The working principle of the temperature-sensing air-cooling drive circuit may be:

[0029] 1) When the temperature sensed by the temperature switch 10 exceeds the threshold temperature of the temperature switch 10, the temperature switch 10 is turned on, and the first end 11 and the second end 12 thereof are connected, so that the first power signal V1 is transmitted to the control end 21 of the transmission module 20; the transmission module 20 controls the transmission module 20 to be turned on based on the first power signal V1, and the input end 22 and the output end 23 thereof are connected, so that the switch control signal V2 is transmitted to the control end 31 of the switch module 30; the switch module 30 controls the switch module 30 to be turned on based on the switch control signal V2, and the input end 32 and the output end 33 thereof are connected, so that the drive power signal VS is transmitted to the motor M1 of the cooling fan; the motor M1 is powered on and starts to run, driving the blades of the cooling fan to rotate, thereby realizing heat dissipation of the battery module.

[0030] 2) When the temperature sensed by the temperature switch 10 drops below the threshold temperature of the temperature switch 10, the temperature switch 10 is turned off, and the first end 11 and the second end 12 thereof are disconnected. The transmission module 20 is turned off due to failure to receive the first power signal V1, and the switch module 30 is turned off due to failure to receive the switch control signal V2, so that the driving power signal VS cannot be transmitted to the motor M1 of the cooling fan, and the motor M1 loses power and stops running, causing the blades of the cooling fan to stop rotating to avoid unnecessary energy consumption.

[0031] The threshold temperature can be set according to the heat dissipation requirements for safe operation of the battery module, and the temperature switch 10 can be selected accordingly. The first power signal V1 has the conduction level of the transmission module 20, which can be set to a high level or a low level as required; the switch control signal V2 has the conduction level of the switch module 30, which can be set to a high level or a low level as required.

[0032] In summary, in the temperature-sensing air-cooling driving circuit provided by the embodiment of the utility model, the temperature of the battery pack is sensed by the temperature switch 10, and the temperature switch 10 can be directly operated according to the temperature, and the signal output by the temperature switch 10 directly acts on the transmission module 20, thereby realizing the on-off control of the switch module 30. In this way, it is equivalent to integrating the temperature sensing device and the switch control device together. Compared with using a separate temperature sensing device to detect the temperature and then performing heat dissipation-related control through the data processing and task issuing of the processor, the embodiment of the utility model can sense the temperature of the battery pack more directly and quickly, and react immediately when the battery pack is discharged and heated, and perform exhaust and heat dissipation. In addition, based on the working characteristics of the temperature switch 10, it can automatically restore the initial state after the battery pack temperature drops to its threshold temperature to stop the air cooling cycle. The threshold temperature of the temperature switch 10 is used as the starting condition of the heat dissipation fan, and also as the stopping condition of the heat dissipation fan, so that the temperature-sensing air-cooling driving circuit can control the heat dissipation fan to stop running in time when the battery pack temperature falls back to a safe range, avoiding unnecessary energy consumption and achieving energy saving effect. Therefore, the temperature-sensing air-cooling drive circuit provided in the embodiment of the utility model can quickly sense the temperature changes of the battery pack in the battery module, has high reliability, strong real-time performance, and quick action response, and can exhaust and dissipate heat in time while taking into account the energy-saving effect.

[0033] The following is an exemplary description of the specific structures that each functional module in the temperature-sensitive air-cooled drive circuit may have, but it is not intended to limit the present invention.

[0034] Figure 2 Schematic diagram of another temperature-sensitive air-cooling drive circuit provided by the embodiment of the utility model. Figure 1 and Figure 2In one embodiment, optionally, the transmission module 20 includes: an optocoupler U1 and a first resistor R1; the first end of the first resistor R1 is connected to the second power supply signal VCC, the first end of the light source of the optocoupler U1 is the pin 1 of the optocoupler U1, connected to the second end of the first resistor R1; the second end of the light source of the optocoupler U1 is the pin 2 of the optocoupler U1, connected to the control end 21 of the transmission module 20, and further connected to the second end 12 of the temperature switch 10; the first end of the light receiver of the optocoupler U1 is the pin 3 of the optocoupler U1, connected to the input end 22 of the transmission module 20, and connected to the light control signal V2; the second end of the light receiver of the optocoupler U1 is the pin 4 of the optocoupler U1, connected to the output end 23 of the transmission module 20, and further connected to the control end 31 of the switch module 30.

[0035] In this embodiment, by setting the transmission module 20 to include an optical coupler U1, electrical isolation of the two sides of the optical coupler U1 can be achieved, so as to avoid the electrical fault on one side from being transmitted to the other side, thereby improving the reliability of the temperature-sensitive air-cooled driving circuit. The first resistor R1 can be used as a current-limiting resistor on the light source side of the optical coupler U1. Exemplarily, the first power signal V1 can be a ground signal GND, and the second power signal VC can be a positive voltage.

[0036] Continue to see Figure 2 On the basis of the above embodiments, optionally, the switch module 30 includes: a transistor Q1 and a second resistor R2; a first end of the second resistor R2 is connected to a control end 31 of the switch module 30, a control electrode of the transistor Q1 is connected to a second end of the second resistor R2, a first electrode of the transistor Q1 is connected to an input end 32 of the switch module 30, and is connected to a driving power signal VS; a second electrode of the transistor Q1 is connected to an output end 33 of the switch module 30.

[0037] Exemplarily, the transistor Q1 may be a controllable switch such as a triode or a MOS tube, and the second resistor R2 is a protective resistor of the control electrode of the transistor Q1. Exemplarily, the transistor Q1 is a PMOS tube, and the switch control signal V2 may be a ground signal GND. Exemplarily, the drive power signal VS is a positive voltage, and the second power signal VCC may be multiplexed as the drive power signal VS.

[0038] Furthermore, the switch module 30 may also include: a third resistor R3, which serves as a pull-up resistor for the control electrode of the transistor Q1. The first end of the third resistor R3 is connected to the drive power signal VS, and the second end of the third resistor R3 is connected to the control electrode of the transistor Q1. In this way, when the control electrode of the transistor Q1 does not receive the switch control signal V2, a high level can be stably provided to the control electrode of the transistor Q1, thereby preventing the control electrode of the transistor Q1 from floating and causing the transistor Q1 to be mis-conducted, thereby improving circuit reliability.

[0039] Continue to see Figure 2On the basis of the above embodiments, optionally, the temperature-sensitive air-cooling drive circuit also includes: a fourth resistor R4; the output end 33 of the switch module 30 is connected to the first end of the motor M1 of the cooling fan, the second end of the motor M1 of the cooling fan is connected to the first end of the fourth resistor R4, and the second end of the fourth resistor R4 is grounded. Further, the temperature-sensitive air-cooling drive circuit also includes: a freewheeling diode D1, which is connected in parallel between the first end and the second end of the motor M1 of the cooling fan to ensure the stable operation of the motor M1 of the cooling fan. Exemplarily, the anode A of the freewheeling diode D1 is connected to the second end of the motor M1, and the cathode K of the freewheeling diode D1 is connected to the first end of the motor M1.

[0040] On the basis of the above embodiments, optionally, the control end 21 of the transmission module 20 is also connected to the controller in the battery module, and the transmission module 20 is also used to control whether the input end 22 and the output end 23 of the transmission module 20 are connected according to the drive control signal Sdr output by the controller. In other words, the temperature-sensitive air-cooling drive circuit is compatible with the controller for intelligent control. When the level transmitted by the drive control signal Sdr is equal to the level of the first power signal V1 (i.e., the on-level of the transmission module 20), the transmission module 20 can be controlled to be turned on; when the level transmitted by the drive control signal Sdr is not equal to the level of the first power signal V1 (i.e., the off-level of the transmission module 20), the transmission module 20 can be controlled to be turned off. In this way, the control method of the temperature-sensitive air-cooling drive circuit can be more flexible. Except for the case where the temperature of the battery pack rises to the threshold temperature of the temperature switch 10, when the battery module needs to be cooled, the drive control signal Sdr transmitted by the controller can be used to control whether the cooling fan is started.

[0041] Exemplarily, the controller may be a CPU (Central Processing Unit). When it is not necessary to control the cooling fan to start, the controller may control the pin transmitting the driving control signal Sdr to float, or control the driving control signal Sdr to maintain the cut-off level of the input module 20 .

[0042] In summary, the temperature-sensitive air-cooling driving circuit may include: a temperature switch 10, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, an optical coupler U1, a transistor Q1 and a freewheeling diode D1. Figure 2 Taking the specific structure in FIG. 1 as an example, the battery pack is a lithium battery pack, and the transistor Q1 is a MOS tube, the working principle is as follows:

[0043] 1. When the temperature of the lithium battery pack in the pack exceeds the threshold temperature of the temperature switch 10, the temperature switch 10 conducts, so that the pin 2 of the optocoupler U1 receives a low level. The light-emitting source of the optocoupler U1 is powered on and emits light, causing the light-receiving device of the optocoupler U1 to conduct. The gate level of the MOS transistor is pulled low, that is, Ug < Us, Ugs < Uth, and the MOS transistor conducts, providing the drive power signal VS to the motor M1. The fan blades of the cooling fan rotate with the motor M1, and the heat dissipation is turned on. Wherein, Ug is the gate voltage of the MOS transistor, Us is the source voltage of the MOS transistor, Ugs is the gate-source voltage difference of the MOS transistor, and Uth is the threshold voltage of the MOS transistor.

[0044] 2. When the temperature of the lithium battery pack in the pack drops below the threshold temperature of the temperature switch 10, the temperature switch 10 cuts off. The light-emitting source of the optocoupler U1 loses power and goes out, causing the light-receiving device of the optocoupler U1 to cut off. The gate level of the MOS transistor is pulled high by the third resistor R3, the MOS transistor cuts off, the motor M1 loses power and stops, and the fan blades of the cooling fan stop rotating, thus achieving the effect of energy saving.

[0045] 3. This circuit is compatible with and supports intelligent control using a CPU chip. Whether to perform heat dissipation can be started and stopped by the CPU by sending a drive control signal Sdr (or a drive control instruction). When the CPU signal instruction is at a low level, it has the same effect as when the temperature switch 10 conducts, and the cooling fan starts; when the CPU signal instruction is at a high level, it has the same effect as when the temperature switch 10 cuts off, and the cooling fan stops rotating.

[0046] On the basis of the above embodiments, optionally, the temperature-sensing air-cooled drive circuit may include multiple temperature switches 10; the multiple temperature switches 10 are respectively arranged at different positions of the battery pack. The first ends 11 of each temperature switch 10 are all connected to the first power signal V1, and the second ends 12 of each temperature switch 10 are all connected to the control end 21 of the transmission module 20. Then, as long as one temperature switch 10 senses that the temperature exceeds its threshold temperature, it can control the transmission module 20 to conduct, and further control the switch module 30 to conduct, so as to drive the motor M1 of the cooling fan to operate and turn on the heat dissipation. Such a setting in this embodiment can achieve multi-point acquisition of the battery pack temperature, effectively improve the temperature sensing sensitivity of the temperature-sensing air-cooled drive circuit, and turn on the heat dissipation in time once the temperature of some positions of the battery pack rises relatively high, improving the safety and reliability of the battery module operation.

[0047] The embodiment of the utility model also provides a battery module, including the temperature-sensing air-cooling drive circuit provided by any embodiment of the utility model, and has corresponding beneficial effects. Exemplarily, the battery module includes: a battery pack, a thermal management system and a BMS (Battery Management System), etc., all of which are arranged in the box of the battery module. Among them, the thermal management system may include at least one cooling fan and at least one temperature-sensing air-cooling drive circuit, and the thermal management system or BMS may include a controller. In the battery module, the number of fans and the number of temperature-sensing air-cooling drive circuits can be set according to actual needs. As long as the motor of each cooling fan is connected to at least one temperature-sensing air-cooling drive circuit, the start and stop control of each cooling fan can be realized based on each temperature-sensing air-cooling drive circuit. Among them, a temperature-sensing air-cooling drive circuit can be connected to the motor of one or more cooling fans.

[0048] Exemplarily, the battery module may include multiple cooling fans, which may be arranged at different positions in the box to achieve better and more uniform heat dissipation. And / or, the battery module may include multiple temperature-sensitive air-cooling drive circuits, and each temperature switch in the multiple temperature-sensitive air-cooling drive circuits is arranged at different positions of the battery pack to collect the temperature of multiple points in the battery pack. As long as the temperature collected by one of the temperature switches exceeds its threshold temperature threshold, the temperature switch can control the temperature-sensitive air-cooling drive circuit to drive the connected cooling fan to run, so as to achieve more precise temperature collection, so that the temperature response of the thermal management system is more sensitive and the heat dissipation is started more timely.

[0049] The above specific implementations do not constitute a limitation on the protection scope of the present utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A temperature-sensitive air-cooled drive circuit, It is characterized in that include: Temperature switches, transmission modules and switch modules; The first end of the temperature switch is connected to the first power signal, and the second end of the temperature switch is connected to the control end of the transmission module; The temperature switch is used to control whether the first end and the second end of the temperature switch are connected according to the temperature of the battery pack in the battery module; The input end of the transmission module is connected to the switch control signal, and the output end of the transmission module is connected to the control end of the switch module; The transmission module is used to control whether the input end and the output end of the transmission module are connected according to the level of the control end of the transmission module; The input end of the switch module is connected to a driving power signal, and the output end of the switch module is connected to the motor of the cooling fan in the battery module; the switch module is used to control whether the input end and the output end of the switch module are connected according to the level of the control end of the switch module.

2. The temperature-sensitive air-cooling drive circuit according to claim 1, It is characterized in that The transmission module includes: an optocoupler and a first resistor; the first end of the first resistor is connected to the second power supply signal, the first end of the light source of the optocoupler is connected to the second end of the first resistor, the second end of the light source of the optocoupler is connected to the control end of the transmission module, the first end of the light receiver of the optocoupler is connected to the input end of the transmission module, and the second end of the light receiver of the optocoupler is connected to the output end of the transmission module.

3. The temperature-sensitive air-cooled driving circuit according to claim 1, It is characterized in that The switch module includes: a transistor and a second resistor; the first end of the second resistor is connected to the control end of the switch module, the control electrode of the transistor is connected to the second end of the second resistor, the first electrode of the transistor is connected to the input end of the switch module, and the second electrode of the transistor is connected to the output end of the switch module.

4. The temperature-sensitive air-cooling drive circuit according to claim 3, It is characterized in that The switch module further includes: a third resistor; a first end of the third resistor is connected to the driving power signal, and a second end of the third resistor is connected to the control electrode of the transistor.

5. The temperature-sensitive air-cooling drive circuit according to claim 1, It is characterized in that Also includes: a fourth resistor; an output end of the switch module is connected to a first end of the motor of the cooling fan, a second end of the motor of the cooling fan is connected to a first end of the fourth resistor, and a second end of the fourth resistor is grounded.

6. The temperature-sensitive air-cooling drive circuit according to claim 5, It is characterized in that Also includes: A freewheeling diode is connected in parallel between the first end and the second end of the motor of the heat dissipation fan.

7. The temperature-sensitive air-cooling driving circuit according to claim 1, It is characterized in that The control end of the transmission module is also connected to the controller in the battery module, and the transmission module is also used to control whether the input end and the output end of the transmission module are connected according to the driving control signal output by the controller.

8. The temperature-sensitive air-cooled driving circuit according to any one of claims 1 to 7, It is characterized in that The temperature-sensing air-cooling driving circuit includes a plurality of temperature switches; the plurality of temperature switches are respectively arranged at different positions of the battery pack.

9. A battery module, It is characterized in that include: A battery pack, at least one cooling fan and at least one temperature-sensitive air-cooling drive circuit as described in any one of claims 1 to 8; the motor of each cooling fan is connected to at least one temperature-sensitive air-cooling drive circuit.

10. The battery module according to claim 9, It is characterized in that The battery module includes a plurality of the temperature-sensitive air-cooling drive circuits, and the temperature switches in the plurality of the temperature-sensitive air-cooling drive circuits are arranged at different positions of the battery pack.

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