Lithium battery cooling device and method

Abstract

The invention discloses a lithium battery cooling device and method, and relates to the technical field of lithium battery cooling components, the lithium battery cooling device comprises a lithium battery cooling plate mounted in a lithium battery and a water cooling assembly arranged in the lithium battery cooling plate, and a monitoring groove is formed in the front side of the lithium battery cooling plate; when the battery runs or is quickly charged, the generated temperature can be transmitted to the lithium battery cooling plate, at the moment, an expansion air bag can be heated and expanded to push a sliding plate and push a sliding piece to compress a second spring, a touch block can touch a corresponding electromagnetic switch, it can be detected that the battery is in a low-temperature state, and at the moment, a micro water pump is controlled to reduce the rotating speed; according to the lithium battery cooling plate, the flowing speed of cooling liquid in the bent pipe can be slowed down, so that the problem that the performance is poor due to the fact that the temperature of the battery is too low can be avoided, vibration generated by the micro water pump can be reduced, resonance borne by the lithium battery cooling plate is reduced, and the use performance of the lithium battery cooling plate is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery cooling components, and in particular to a lithium battery cooling device and method. Background Art

[0002] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as the positive / negative electrode material and a non-aqueous electrolyte solution. Due to the very active chemical properties of lithium metal, the processing, storage, and use of lithium metal have very high environmental requirements. With the development of science and technology, lithium batteries have become mainstream. In order to effectively dissipate the heat generated inside, existing lithium batteries usually have a cooling device installed inside the lithium battery. The most commonly used method is to install a water cooling structure inside the lithium battery, using the flow of coolant to absorb the high heat emitted by the battery, thereby reducing the risk of spontaneous combustion.

[0003] However, the above-mentioned existing lithium battery with water-cooling structure cannot control the flow rate of the water-cooling liquid in the water-cooling structure according to the actual temperature of the battery. As a result, the infusion pump in the water-cooling structure in the cooling device can only deliver cooling water at the same speed when the temperature inside the battery is not high and when the temperature is too high. This not only causes excessive heat absorption when the temperature is not high, thereby affecting the performance of the lithium battery, but also causes greater vibration. This vibration will also accelerate the aging rate of other components inside the lithium battery and the stability of the installation, thereby affecting the performance of the lithium battery and the cooling device.

[0004] To this end, we designed a lithium battery cooling device and method to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a lithium battery cooling device and method to solve the problems raised in the above background technology.

[0006] To solve the above technical problems, the present invention provides a lithium battery cooling device, comprising a lithium battery cooling plate for installation inside a lithium battery and a water cooling assembly arranged in the lithium battery cooling plate, a monitoring groove is provided on the front side of the lithium battery cooling plate, an expansion airbag is provided in the monitoring groove, a slide plate is slidably connected in the monitoring groove, a first spring is provided on the other side of the slide plate, the other end of the first spring is installed on the inner side wall of the monitoring groove, two limiting grooves are provided on the front side of the lithium battery cooling plate, a sliding member is slidably connected in the limiting groove, the sliding member cooperates with the sliding member to resist, a second spring is provided on the top of the sliding member, the other end of the second spring is arranged on the top wall in the limiting groove, a contact block is fixedly installed on the top of the sliding member, an electromagnetic switch is fixedly installed on the top wall in the limiting groove, the electromagnetic switch cooperates with the contact block to resist, and the electromagnetic switch is electrically connected to the water cooling assembly.

[0007] Furthermore, a first hemisphere is fixedly mounted on the bottom of the sliding member, and a second hemisphere is fixedly mounted on the top of the sliding plate, and the first hemisphere and the second hemisphere cooperate with each other.

[0008] Furthermore, two guide rods are symmetrically inserted in the slide plate, both ends of the guide rods are fixedly installed in the monitoring groove, and the distance between the two guide rods is smaller than the width of the expansion airbag.

[0009] Furthermore, the water cooling component includes a curved tube and a heat exchange box, which are connected to and embedded in a lithium battery cooling plate. A micro water pump is movably arranged in the lithium battery cooling plate, and both ends of the micro water pump are movably connected to both ends of the curved tube, respectively. The curved tube and the heat exchange box are filled with coolant.

[0010] Furthermore, a buffer assembly is arranged between the micro water pump and the lithium battery cooling plate for buffering the vibration generated by the micro water pump, the buffer assembly includes a mounting seat, the mounting seat is installed on the micro water pump, a rotating part is rotatably arranged in the mounting seat, a guide groove and a shock-absorbing groove are provided in the lithium battery cooling plate, a sliding block is slidably connected in the guide groove, a fixed seat is fixedly installed on the top of the sliding block, the other end of the rotating part is rotatably arranged in the fixed seat, a third spring and a damping cylinder are fixedly installed on one side of the sliding block, the other ends of the third spring and the damping cylinder are fixedly installed on the inner side wall of the guide groove, fixed tubes are fixedly installed at both ends of the micro water pump, the fixed tubes are slidably sleeved on the end of the bent tube, the fixed tubes are fixedly connected to the mounting seat, and the micro water pump is electrically connected to the electromagnetic switch.

[0011] Furthermore, a first pin is arranged in the mounting seat, a second pin is arranged in the fixing seat, and two ends of the rotating member are rotatably sleeved on the first pin and the second pin respectively.

[0012] Furthermore, the number of the buffer components is four, and the four buffer components are symmetrically arranged on both sides of the micro water pump.

[0013] Furthermore, a guide rod is inserted into the sliding block, and both ends of the guide rod are fixedly installed in the guide groove.

[0014] Furthermore, it also includes a limit component for limiting the direction of movement of the micro water pump, the limit component includes a stabilizing groove, the stabilizing groove is opened in the lithium battery cooling plate and is connected to the shock absorbing groove, a connecting piece is fixedly installed on one side of the micro water pump, a placement groove is opened on one side of the connecting piece, a ball is rotatably arranged in the placement groove, and the ball is connected in a rolling manner in the stabilizing groove, the number of the lithium battery cooling plates is two, and the two lithium battery cooling plates are against each other, and bolts are threadedly inserted at the four corners of the front side of one of the lithium battery cooling plates, and the end of the bolt extends into the other lithium battery cooling plate.

[0015] The present invention also discloses a lithium battery cooling method, which uses the above lithium battery cooling device and comprises the following steps:

[0016] S1: When in use, first install the lithium battery cooling plate at a suitable position inside the lithium battery housing, then turn on the micro water pump to circulate the coolant in the curved tube in the curved tube, which can absorb the heat generated by the battery during long-term operation or fast charging, and then inject the heated coolant in the curved tube into the heat exchange box for heat exchange, and this reciprocating process can achieve the effect of cooling the battery;

[0017] S2. In S1, first, the temperature generated by the battery will be transmitted to the lithium battery cooling plate. At this time, the expansion airbag will expand due to the heat and push the slide plate to slide along the direction set by the guide rod. When the second hemisphere pushes the first hemisphere and the slide to compress the second spring to slide upward and make the contact block touch the corresponding electromagnetic switch, it can be detected that the battery is in a low temperature state. At this time, the corresponding electromagnetic switch will send an electrical signal to the micro water pump, and the micro water pump can be controlled to reduce the speed, which can slow down the flow rate of the coolant in the curved pipe, which not only helps to avoid the problem of poor performance due to the low battery temperature, but also reduces the vibration generated by the micro water pump, thereby reducing the resonance of the lithium battery cooling plate, thereby indirectly improving the performance of the lithium battery cooling plate;

[0018] S3. In S2, when the second hemisphere passes over the first hemisphere located at the front side and contacts the first hemisphere located at the rear side, the first hemisphere drives the corresponding sliding member to compress the second spring to slide upward and make the contact block touch the corresponding electromagnetic switch. At this time, it can be proved that the battery generates ultra-high temperature heat. At this time, the micro water pump can be controlled to increase the speed so that the high flow rate can absorb the high heat;

[0019] S4. In addition, when the coolant flows at high speed, the micro water pump will vibrate greatly, and the lithium battery cooling plate will inevitably have a resonance problem. At this time, the micro water pump will move up and down, and at the same time, the rotating part will push the sliding block to slide in the guide groove and stretch or compress the third spring to absorb the vibration force. After the vibration force is absorbed, the damping cylinder can achieve a buffering effect to avoid the lithium battery cooling plate being affected by resonance for a long time and affecting the performance and installation stability.

[0020] Compared with the prior art, the beneficial effect of the present invention is that the temperature generated when the battery is running or fast charging will be transmitted to the lithium battery cooling plate. At this time, the expansion airbag will expand due to the heat and push the slide plate and push the slide to compress the second spring, so that the contact block can touch the corresponding electromagnetic switch, and it can be detected that the battery is in a low temperature state. At this time, the micro water pump is controlled to reduce the speed, which can slow down the flow rate of the coolant in the curved tube, which not only helps to avoid the problem of poor performance due to excessively low battery temperature, but also reduces the vibration generated by the micro water pump, thereby reducing the resonance of the lithium battery cooling plate, thereby indirectly improving the performance of the lithium battery cooling plate.

[0021] Compared with the prior art, the beneficial effect of the present invention is that when the second hemisphere passes over the first hemisphere located on the front side and abuts against the first hemisphere located on the rear side, the first hemisphere will drive the corresponding sliding part to compress the second spring to slide upward and make the contact block touch the corresponding electromagnetic switch. At this time, it can be proved that the battery generates ultra-high temperature heat. At this time, the micro water pump can be controlled to increase the rotation speed to allow the high flow rate to absorb the high heat.

[0022] Compared with the prior art, the beneficial effect of the present invention is that when the micro water pump runs at high speed, large vibrations will inevitably occur, and the vibration will inevitably cause resonance problems in the lithium battery cooling plate. At this time, the micro water pump will move up and down, and at the same time, the rotating part will push the sliding block to slide in the guide groove and stretch or compress the third spring to absorb the vibration force. After the vibration force is absorbed, the damping cylinder can achieve a buffering effect, thereby avoiding the lithium battery cooling plate from being affected by resonance for a long time and affecting the performance and installation stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the interior half-section of the present invention;

[0024] Figure 2 It is a schematic diagram of the three-dimensional structure of the outer side of the present invention;

[0025] Figure 3 It is a schematic diagram of the three-dimensional structure of the front exterior of the present invention;

[0026] Figure 4 It is a schematic diagram of the three-dimensional structure of the inner half-section of the side of the present invention;

[0027] Figure 5 For the present invention Figure 2 The enlarged view of point A in the middle;

[0028] Figure 6 For the present invention Figure 4 The enlarged view of point B in the middle;

[0029] Figure 7 For the present invention Figure 1 Enlarged view of point C in the middle.

[0030] In the figure: 1. lithium battery cooling plate; 2. monitoring slot; 3. expansion airbag; 4. slide plate; 5. first spring; 6. limit slot; 7. slide; 8. second spring; 9. contact block; 10. electromagnetic switch; 11. first hemisphere; 12. second hemisphere; 13. guide rod; 14. bending pipe; 15. heat exchange box; 16. micro water pump; 17. mounting seat; 18. rotating member; 19. sliding block; 20. fixed seat; 21. third spring; 22. damping cylinder; 23. guide slot; 24. shock absorbing slot; 25. guide rod; 26. fixed pipe; 27. stabilizing slot; 28. connecting piece; 29. ​​ball bearing; 30. bolt. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] See also Figure 1-7The present invention provides a technical solution: a lithium battery cooling device, comprising a lithium battery cooling plate 1 for installation inside a lithium battery and a water cooling component arranged in the lithium battery cooling plate 1, a monitoring slot 2 is provided on the front side of the lithium battery cooling plate 1, an expansion airbag 3 is provided in the monitoring slot 2, a slide plate 4 is slidably connected in the monitoring slot 2, a first spring 5 is provided on the other side of the slide plate 4, and the other end of the first spring 5 is installed on the inner side wall of the monitoring slot 2, two limiting slots 6 are provided on the front side of the lithium battery cooling plate 1, a slide 7 is slidably connected in the limiting slot 6, the slide 7 and the slide plate 4 are matched and abutted, a second spring 8 is provided on the top of the slide 7, and the other end of the second spring 8 is arranged on the inner top wall of the limiting slot 6, a contact block 9 is fixedly installed on the top of the slide 7, an electromagnetic switch 10 is fixedly installed on the inner top wall of the limiting slot 6, the electromagnetic switch 10 and the contact block 9 are matched and abutted, and the electromagnetic switch 10 is electrically connected to the water cooling component;

[0035] A first hemisphere 11 is fixedly installed at the bottom of the slide 7, and a second hemisphere 12 is fixedly installed on the top of the slide plate 4. The first hemisphere 11 and the second hemisphere 12 cooperate with each other. The water cooling component includes a curved tube 14 and a heat exchange box 15. The curved tube 14 and the heat exchange box 15 are connected and embedded in the lithium battery cooling plate 1. A micro water pump 16 is movably arranged in the lithium battery cooling plate 1. Both ends of the micro water pump 16 are movably connected to both ends of the curved tube 14 respectively. The curved tube 14 and the heat exchange box 15 are filled with coolant.

[0036] In the specific implementation, the lithium battery cooling plate 1 is first installed at a suitable position inside the lithium battery housing, and then the micro water pump 16 is turned on to circulate the coolant in the curved tube 14 in the curved tube 14, so as to absorb the heat generated by the battery during long-term operation or fast charging, and then the heated coolant in the curved tube 14 is injected into the heat exchange box 15 for heat exchange, and the reciprocating process can achieve the effect of cooling the battery;

[0037] When operating above, the temperature generated by the battery will be transmitted to the lithium battery cooling plate 1. At this time, the expansion airbag 3 will expand due to heat and push the slide plate 4 to slide along the direction set by the guide rod 13. When the second hemisphere 12 pushes the first hemisphere 11 and the slide 7 to compress the second spring 8 to slide upward and make the contact block 9 touch the corresponding electromagnetic switch 10, it can be detected that the battery is in a low temperature state. At this time, the corresponding electromagnetic switch 10 will send an electrical signal to the micro water pump 16. At this time, the micro water pump 16 can be controlled to reduce the speed, and the flow rate of the coolant in the curved tube 14 can be slowed down, which not only helps to avoid the problem of poor performance due to the low battery temperature, but also reduces the vibration generated by the micro water pump 16, thereby reducing the resonance of the lithium battery cooling plate 1, thereby also improving the performance of the lithium battery cooling plate 1 from the side;

[0038] When the second hemisphere 12 passes over the first hemisphere 11 on the front side and contacts the first hemisphere 11 on the rear side, the first hemisphere 11 will drive the corresponding slider 7 to compress the second spring 8 to slide upward and make the contact block 9 touch the corresponding electromagnetic switch 10. At this time, it can be proved that the battery generates ultra-high temperature heat. At this time, the micro water pump 16 can be controlled to increase the speed to absorb the high heat with a high flow rate.

[0039] See also Figure 1-7 As shown, two guide rods 13 are symmetrically inserted in the slide plate 4, and both ends of the guide rods 13 are fixedly installed in the monitoring slot 2, and the distance between the two guide rods 13 is smaller than the width of the expansion airbag 3. The expansion airbag 3 can be limited to prevent the expansion airbag 3 from sliding out of the monitoring slot 2 by itself, thereby ensuring the stability of the expansion airbag 3 when in use.

[0040] See also Figure 1-7 A buffer assembly is provided between the micro water pump 16 and the lithium battery cooling plate 1 for buffering the vibration generated by the micro water pump 16. The buffer assembly includes a mounting seat 17, which is mounted on the micro water pump 16. A rotating member 18 is rotatably provided in the mounting seat 17. A guide groove 23 and a shock absorbing groove 24 are provided in the lithium battery cooling plate 1. A sliding block 19 is slidably connected in the guide groove 23. A fixed seat 20 is fixedly installed on the top of the sliding block 19. The other end of the rotating member 18 is rotatably provided in the fixed seat 20. A third spring 21 and a damping cylinder 22 are fixedly installed on one side of the sliding block 19. The other ends of the third spring 21 and the damping cylinder 22 are fixedly installed on the inner side wall of the guide groove 23. Fixed pipes 26 are fixedly installed at both ends of the micro water pump 16. The fixed pipe 26 is slidably sleeved on the end of the bending pipe 14. The fixed pipe 26 is fixedly connected to the mounting seat 17. The micro water pump 16 is electrically connected to the electromagnetic switch 10.

[0041] A first pin is disposed in the mounting seat 17 , a second pin is disposed in the fixing seat 20 , and two ends of the rotating member 18 are rotatably sleeved on the first pin and the second pin respectively.

[0042] During specific implementation, based on the above implementation, when the coolant flows at high speed, the micro water pump 16 will vibrate greatly, and the lithium battery cooling plate 1 will inevitably have a resonance problem. At this time, the micro water pump 16 will move up and down, and at the same time, the rotating part 18 will push the sliding block 19 to slide in the guide groove 23 and stretch or compress the third spring 21 to absorb the vibration force. After the vibration force is absorbed, the damping cylinder 22 can achieve a buffering effect to avoid the lithium battery cooling plate 1 being affected by resonance for a long time and affecting the performance and installation stability.

[0043] See also Figure 1-7The number of buffer components is four, and the four buffer components are symmetrically arranged on both sides of the micro water pump 16. The arrangement of the four buffer components can not only improve the buffering effect of the micro water pump 16, but also avoid the problem of the micro water pump 16 being offset during movement.

[0044] See also Figure 1-7 A guide rod 25 is inserted into the sliding block 19, and both ends of the guide rod 25 are fixedly installed in the guide groove 23. The sliding direction of the sliding block 19 can be limited so that the sliding block 19 can only slide along the direction set by the guide rod 25.

[0045] See also Figure 1-7 , and also includes a limit assembly for limiting the direction of movement of the micro water pump 16. The limit assembly includes a stabilizing groove 27, which is provided in the lithium battery cooling plate 1 and is connected to the shock absorbing groove 24. A connector 28 is fixedly installed on one side of the micro water pump 16. A placement groove is provided on one side of the connector 28. A ball 29 is rotatably provided in the placement groove. The ball 29 is connected in a rolling manner in the stabilizing groove 27. There are two lithium battery cooling plates 1, and the two lithium battery cooling plates 1 are against each other. Bolts 30 are threadedly inserted at the four corners of the front side of one lithium battery cooling plate 1, and the end of the bolt 30 extends into the other lithium battery cooling plate 1. When the micro water pump 16 slides, the ball 29 can roll in the stabilizing groove 27. The two lithium battery cooling plates 1 are connected by multiple bolts 30 to achieve the effect of detachable two lithium battery cooling plates 1, which is convenient for installing many components in the lithium battery cooling plate 1.

[0046] In combination with the above-mentioned lithium battery cooling device, a lithium battery cooling method is provided, which specifically includes the following steps:

[0047] S1: When in use, first install the lithium battery cooling plate 1 at a suitable position inside the lithium battery housing, then turn on the micro water pump 16 to circulate the coolant in the curved tube 14 in the curved tube 14, so as to absorb the heat generated by the battery during long-term operation or fast charging, and then inject the heated coolant in the curved tube 14 into the heat exchange box 15 for heat exchange, and this reciprocating process can achieve the effect of cooling the battery;

[0048] S2. In S1, first, the temperature generated by the battery will be transmitted to the lithium battery cooling plate 1. At this time, the expansion airbag 3 will expand due to the heat and push the slide plate 4 to slide along the direction set by the guide rod 13. When the second hemisphere 12 pushes the first hemisphere 11 and the slide 7 to compress the second spring 8 to slide upward and make the contact block 9 touch the corresponding electromagnetic switch 10, it can be detected that the battery is in a low temperature state. At this time, the corresponding electromagnetic switch 10 will send an electrical signal to the micro water pump 16. At this time, the micro water pump 16 can be controlled to reduce the speed, and the flow rate of the coolant in the curved tube 14 can be slowed down, which not only helps to avoid the problem of poor performance due to the low battery temperature, but also reduces the vibration generated by the micro water pump 16, thereby reducing the resonance of the lithium battery cooling plate 1, thereby also indirectly improving the performance of the lithium battery cooling plate 1;

[0049] S3. In S2, when the second hemisphere 12 passes over the first hemisphere 11 at the front side and contacts the first hemisphere 11 at the rear side, the first hemisphere 11 drives the corresponding slider 7 to compress the second spring 8 and slide upward to make the contact block 9 touch the corresponding electromagnetic switch 10. At this time, it can be proved that the battery generates ultra-high temperature heat. At this time, the micro water pump 16 can be controlled to increase the speed so that the high flow rate can absorb the high heat;

[0050] S4. In addition, when the coolant flows at a high speed, the micro water pump 16 will vibrate greatly, and the lithium battery cooling plate 1 will inevitably have a resonance problem. At this time, the micro water pump 16 will move up and down, and at the same time, the rotating part 18 will push the sliding block 19 to slide in the guide groove 23 and stretch or compress the third spring 21 to absorb the vibration force. After the vibration force is absorbed, the damping cylinder 22 can achieve a buffering effect to avoid the lithium battery cooling plate 1 being affected by resonance for a long time and affecting the performance and installation stability.

[0051] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can also be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. A lithium battery cooling device, comprising a lithium battery cooling plate (1) for installation inside a lithium battery and a water cooling component arranged inside the lithium battery cooling plate (1), characterized in that: The front side of the lithium battery cooling plate (1) is provided with a monitoring groove (2), an expansion airbag (3) is arranged in the monitoring groove (2), a slide plate (4) is slidably connected in the monitoring groove (2), a first spring (5) is arranged on the other side of the slide plate (4), the other end of the first spring (5) is mounted on the inner side wall of the monitoring groove (2), the front side of the lithium battery cooling plate (1) is provided with two limit grooves (6), a slide member (7) is slidably connected in the limit groove (6), the slide member (7) and the slide plate (4) are matched and abutted against each other, a second spring (8) is arranged on the top of the slide member (7), the other end of the second spring (8) is arranged on the inner top wall of the limit groove (6), a contact block (9) is fixedly installed on the top of the slide member (7), an electromagnetic switch (10) is fixedly installed on the inner top wall of the limit groove (6), the electromagnetic switch (10) and the contact block (9) are matched and abutted against each other, and the electromagnetic switch (10) is electrically connected to the water cooling component.

2. A lithium battery cooling device as claimed in claim 1, characterized in that: A first hemispherical body (11) is fixedly mounted on the bottom of the sliding member (7), and a second hemispherical body (12) is fixedly mounted on the top of the sliding plate (4); the first hemispherical body (11) and the second hemispherical body (12) cooperate with each other.

3. A lithium battery cooling device as claimed in claim 1, characterized in that: Two guide rods (13) are symmetrically inserted into the slide plate (4), both ends of the guide rods (13) are fixedly installed in the monitoring groove (2), and the distance between the two guide rods (13) is smaller than the width of the expansion airbag (3).

4. A lithium battery cooling device as claimed in claim 1, characterized in that: The water cooling assembly comprises a curved tube (14) and a heat exchange box (15); the curved tube (14) and the heat exchange box (15) are connected and embedded in a lithium battery cooling plate (1); a micro water pump (16) is movably arranged in the lithium battery cooling plate (1); two ends of the micro water pump (16) are respectively movably connected to two ends of the curved tube (14); and the curved tube (14) and the heat exchange box (15) are both filled with cooling liquid.

5. A lithium battery cooling device as claimed in claim 4, characterized in that: A buffer assembly is provided between the micro water pump (16) and the lithium battery cooling plate (1) for buffering vibrations generated by the micro water pump (16). The buffer assembly comprises a mounting seat (17). The mounting seat (17) is mounted on the micro water pump (16). A rotating member (18) is rotatably provided in the mounting seat (17). A guide groove (23) and a shock absorbing groove (24) are provided in the lithium battery cooling plate (1). A sliding block (19) is slidably connected in the guide groove (23). A fixed seat (20) is fixedly installed on the top of the sliding block (19). The other end of the moving member (18) is rotatably arranged in the fixed seat (20); a third spring (21) and a damping cylinder (22) are fixedly installed on one side of the sliding block (19); the other ends of the third spring (21) and the damping cylinder (22) are fixedly installed on the inner wall of the guide groove (23); fixed tubes (26) are fixedly installed at both ends of the micro water pump (16); the fixed tubes (26) are slidably sleeved on the end of the bent tube (14); the fixed tubes (26) are fixedly connected to the mounting seat (17); and the micro water pump (16) is electrically connected to the electromagnetic switch (10).

6. A lithium battery cooling device as claimed in claim 5, characterized in that: A first pin is arranged in the mounting seat (17), a second pin is arranged in the fixing seat (20), and two ends of the rotating member (18) are rotatably sleeved on the first pin and the second pin respectively.

7. A lithium battery cooling device as claimed in claim 5, characterized in that: The number of the buffer components is four, and the four buffer components are symmetrically arranged on both sides of the micro water pump (16).

8. A lithium battery cooling device as claimed in claim 5, characterized in that: A guide rod (25) is inserted into the sliding block (19), and both ends of the guide rod (25) are fixedly installed in the guide groove (23).

9. A lithium battery cooling device as claimed in claim 5, characterized in that: The invention also includes a limiting component for limiting the direction of movement of the micro water pump (16), the limiting component including a stabilizing groove (27), the stabilizing groove (27) being arranged in the lithium battery cooling plate (1) and being connected to the shock absorbing groove (24), a connecting piece (28) being fixedly mounted on one side of the micro water pump (16), a placement groove being arranged on one side of the connecting piece (28), a ball (29) being rotatably arranged in the placement groove, the ball (29) being rollingly connected in the stabilizing groove (27), the number of the lithium battery cooling plates (1) being two, and the two lithium battery cooling plates (1) being abutted against each other, a bolt (30) being threadedly inserted at the four corners on the front side of one of the lithium battery cooling plates (1), the end of the bolt (30) extending into the other lithium battery cooling plate (1).

10. A lithium battery cooling method, characterized in that: A lithium battery cooling device according to any one of claims 1 to 9 is used, The following steps are involved: S1: When in use, the lithium battery cooling plate (1) is first installed at a suitable position inside the lithium battery housing, and then the micro water pump (16) is turned on to allow the coolant in the curved tube (14) to circulate in the curved tube (14), thereby absorbing the heat generated by the battery during long-term operation or fast charging. Subsequently, the heated coolant in the curved tube (14) is injected into the heat exchange box (15) for heat exchange, and this reciprocating process can achieve the effect of cooling the battery. S2. In S1, the temperature generated by the battery is first transmitted to the lithium battery cooling plate (1). At this time, the expansion airbag (3) will expand due to the heat and push the slide plate (4) to slide along the direction set by the guide rod (13). When the second hemisphere (12) pushes the first hemisphere (11) and the slide (7) to compress the second spring (8) to slide upward and make the contact block (9) touch the corresponding electromagnetic switch (10), it can be detected that the battery is in a low temperature state. At this time, the corresponding electromagnetic switch (10) will send an electrical signal to the micro water pump (16). At this time, the micro water pump (16) can be controlled to reduce the rotation speed, and the flow speed of the coolant in the curved tube (14) can be slowed down, thereby not only helping to avoid the problem of poor performance due to the battery temperature being too low, but also reducing the vibration generated by the micro water pump (16), thereby reducing the resonance of the lithium battery cooling plate (1), thereby indirectly improving the performance of the lithium battery cooling plate (1); S3. In S2, when the second hemisphere (12) passes over the first hemisphere (11) located at the front side and contacts the first hemisphere (11) located at the rear side, the first hemisphere (11) drives the corresponding sliding member (7) to compress the second spring (8) to slide upward and make the contact block (9) touch the corresponding electromagnetic switch (10). At this time, it can be proved that the battery generates ultra-high temperature heat. At this time, the micro water pump (16) can be controlled to increase the rotation speed so that the high flow rate can absorb the high heat; S4. In addition, when the coolant flows at a high speed, the micro water pump (16) will vibrate greatly. At this time, the lithium battery cooling plate (1) will inevitably experience resonance. At this time, the micro water pump (16) will move up and down, and at the same time, the rotating part (18) will push the sliding block (19) to slide in the guide groove (23) and stretch or compress the third spring (21) to absorb the vibration force. After the vibration force is absorbed, the damping cylinder (22) can achieve a buffering effect, thereby preventing the lithium battery cooling plate (1) from being affected by resonance for a long time and affecting the performance and installation stability.

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