A porous medium-based cylindrical battery heat dissipation system

Abstract

The application discloses a cylindrical battery heat dissipation system based on a porous medium, which comprises a battery bottom cover and a battery sealing shell arranged opposite to the battery bottom cover, and an insulating pad is fixedly arranged at the middle part of the top end of the battery bottom cover, and heat exchange partitions are uniformly arranged on the insulating pad. The cylindrical battery heat dissipation system based on the porous medium adopts a hollow battery rack to arrange and place cylindrical lithium batteries, air can flow in the middle part of the battery rack under the driving of a fan, the cylindrical lithium batteries are directly in contact with the porous medium, and the purpose of quickly ventilating and heat exchanging the working environment of the batteries is achieved, heat exchange partitions abutting against the cylindrical lithium batteries are arranged between adjacent battery racks, cooling liquid circulates and flows in the heat exchange partitions, the heat generated by the batteries during work is transmitted to the cooling water by the porous medium, and the cooling water is circulated and discharged from the battery module in time, so that the heat exchange of the battery module can be quickly realized, and the heat dissipation effect is remarkable.

Description

[Technical Field]

[0001] This invention relates to the field of cylindrical lithium battery heat dissipation technology, and in particular to a cylindrical battery heat dissipation system based on porous media. [Background Technology]

[0002] Cylindrical lithium batteries are currently the mainstream power supply devices, widely used in production and daily life due to their small size, high energy density, and portability. Since the voltage of a single cylindrical lithium battery is typically between 3.6-4.2V, to meet voltage requirements, these cylindrical batteries need to be arranged neatly and connected in series to form a battery module. The battery core has internal resistance, and heat is generated during battery module operation. The cylindrical batteries inside the module cannot directly contact the air for heat exchange, thus hindering immediate heat dissipation. Prolonged operation of cylindrical lithium batteries in a high-heat environment affects the stability of battery power supply and poses a safety hazard of spontaneous combustion. Currently, the common method for cooling cylindrical battery modules is to install a cooling fan inside the battery casing. When the cylindrical battery module is operating, the cooling fan blows directly onto the battery, increasing airflow and achieving rapid ventilation and heat exchange.

[0003] A search revealed other existing technologies for heat dissipation systems of cylindrical batteries using porous media heat exchange, such as the heat dissipation method and system for a dual-row cylindrical battery based on porous media, as described in application number 201610389363.8. This battery heat dissipation system divides the battery panels into two groups, symmetrically mounted at both ends of a rotating shaft. The battery panels form a cylinder around the rotating shaft, and a porous media heat exchange plate is installed between the two groups of battery panels. Finally, the system is encapsulated within a cylindrical steel shell to form a cylindrical lithium battery. During use, external air can circulate between the porous heat exchange media plates through the upper and lower air inlets, thereby achieving heat exchange with the battery panels. However, because the air inlets of this cylindrical battery are small and rely solely on natural airflow, the airflow rate within the battery's steel shell is low. Therefore, the applicant believes that traditional cylindrical battery heat dissipation systems have the following shortcomings:

[0004] 1. Relying solely on air circulation, combined with porous media, to carry away the heat generated during the operation of the battery pack and achieve the purpose of heat dissipation, the heat exchange effect with the outside is poor, and it is impossible to quickly achieve the purpose of cooling and heat exchange of the cylindrical lithium battery in the middle of the module.

[0005] 2. It is only suitable for small battery modules and cannot meet the needs of large cylindrical battery modules, thus limiting its applicability.

[0006] 3. The compact packaging makes it inconvenient for later maintenance and repair.

[0007] Therefore, it is necessary to provide a cylindrical battery heat dissipation system based on porous media to overcome the above-mentioned defects. [Summary of the Invention]

[0008] The purpose of this invention is to provide a cylindrical battery heat dissipation system based on porous media to solve the problems of poor heat dissipation effect and limited applicability of existing battery heat dissipation systems.

[0009] To achieve the above objectives, the present invention provides a cylindrical battery heat dissipation system based on porous media, including a battery bottom cover and a battery casing disposed opposite to the battery bottom cover. An insulating pad is fixedly disposed at the center of the top of the battery bottom cover. Uniformly distributed heat exchange baffles are fixedly disposed on the insulating pad. A cylindrical battery module for fixing cylindrical batteries is disposed between two adjacent heat exchange baffles. The cylindrical battery module includes a battery rack and ventilation holes in the center of the battery rack. A first porous heat exchange medium extending into the ventilation holes is fixedly disposed on both sides of the battery rack. Uniformly distributed battery slots are formed on the outer side of the first porous heat exchange medium. Cylindrical lithium batteries are engaged and connected inside the battery slots. A flow guiding cavity and a return cavity are formed inside the heat exchange baffles. A second porous heat exchange medium is fixedly disposed on both sides of the heat exchange baffles. A second flow guiding pipe is fixedly connected between two adjacent flow guiding cavities, and a second flow returning pipe is fixedly connected between two adjacent return cavities. The first guide pipe, a third guide pipe is fixedly connected between one of the guide chambers and the return chamber, a cooling component for heat exchange of coolant and a coolant tank are fixedly installed on one side of the top of the battery bottom cover, a small circulation pump is fixedly installed on the top of the coolant tank, the outlet of the small circulation pump is fixedly connected to an injection pipe, one end of the injection pipe is fixedly connected to the inside of the guide chamber, and a return pipe is fixedly connected to the front of the return chamber; a hollow battery rack is used to arrange cylindrical lithium batteries, and air can circulate in the middle of the battery rack driven by a fan, so that the cylindrical lithium batteries are in direct contact with the porous medium to achieve the purpose of rapid ventilation and heat exchange of the battery working environment. A heat exchange baffle is provided between adjacent battery racks, which is in close contact with the cylindrical lithium batteries. Coolant circulates in the heat exchange baffle, and the heat generated by the battery during operation is transferred to the cooling water by the porous medium and circulated in time and discharged from the battery module, which can quickly achieve heat exchange of the battery module and the heat dissipation effect is significant.

[0010] In a preferred embodiment, mounting base plates are fixedly provided on both sides of the bottom end of the battery rack, and mounting bolts are threaded onto the mounting base plates. The mounting base plates are fixedly mounted on the insulating pad by the mounting bolts, making it easy to disassemble and maintain the battery module.

[0011] In a preferred embodiment, the top of the battery casing is hinged with an upper cover, a thermal management box is fixedly disposed in the middle of the upper cover, a thermal management controller is fixedly installed inside the thermal management box, and a door lock is fixedly installed at one end of the upper cover for easy maintenance and repair.

[0012] In a preferred embodiment, the cooling assembly includes a heat exchange frame and a serpentine heat exchange tube fixedly mounted on the heat exchange frame. A heat exchange fan is fixedly installed on the inner side of the heat exchange frame. One end of the return pipe is fixedly connected to one end of the serpentine heat exchange tube, and the other end of the serpentine heat exchange tube is fixedly connected to the interior of the coolant storage tank. The heat exchange fan is electrically connected to a thermal management controller and can cool the coolant after heat exchange, facilitating its recycling.

[0013] In a preferred embodiment, a cooling fan is fixedly installed on the front of the battery casing, and the back of the battery casing is provided with evenly distributed ventilation grilles. The cooling fan is positioned directly opposite the ventilation grilles and is electrically connected to the thermal management controller to facilitate air circulation and improve heat dissipation.

[0014] In a preferred embodiment, a temperature detector located inside the battery casing is fixedly installed at the bottom of the upper cover. The temperature detector is electrically connected to the thermal management controller and can detect problems inside the battery module in real time, thereby preventing the battery from overheating and reducing safety hazards.

[0015] In a preferred embodiment, the heat exchange baffle is corrugated, and the inner side of the second porous heat exchange medium is closely attached to the flow guiding cavity and the return cavity. The flow guiding cavity and the return cavity are symmetrically distributed inside the heat exchange baffle, so the cooling water flows stably, has a long flow time inside the heat exchange baffle, and has a good heat exchange effect.

[0016] In a preferred embodiment, the heat exchange partition is positioned close to the cylindrical lithium battery, which helps to improve heat dissipation.

[0017] In a preferred embodiment, a pre-reserved notch is provided on one side of the battery casing. The pre-reserved notch heat exchange frame is provided so that after the battery casing is installed, the cooling components can be located outside the battery casing, which is beneficial to improving the cooling and heat exchange effect of the serpentine heat exchange tube.

[0018] In a preferred embodiment, the battery bottom cover has evenly distributed fastening holes on its periphery, and a locking plate is fixedly provided on the periphery of the bottom of the battery casing. The locking plate is threaded with evenly distributed fastening bolts, and the fastening bolts are arranged one-to-one with the fastening holes. The cover-type fastening method realizes the encapsulation of the cylindrical battery and the heat dissipation system, which facilitates later maintenance and repair.

[0019] The present invention provides a cylindrical battery heat dissipation system based on porous media, which has the following advantages:

[0020] 1. This cylindrical battery cooling system uses a hollow battery rack to arrange cylindrical lithium batteries. The middle of the battery rack can be circulated with air driven by a fan, and the cylindrical lithium batteries are in direct contact with the porous medium to achieve rapid ventilation and heat exchange of the battery working environment. There are heat exchange baffles between adjacent battery racks that are in close contact with the cylindrical lithium batteries. Coolant circulates in the heat exchange baffles. The heat generated by the battery during operation is transferred to the cooling water by the porous medium and circulated in time and discharged from the battery module. This can quickly achieve heat exchange of the battery module, with a significant heat dissipation effect, and can ensure the stability of the cylindrical battery working environment.

[0021] 2. Relying on an excellent ventilation system and a coolant circulation system that flows closely to the cylindrical battery, combined with porous media for heat transfer, heat dissipation is fast and efficient, which can meet the heat dissipation requirements of large battery modules and has a wider range of applications.

[0022] 3. The use of a cap-type snap-fit ​​method enables the encapsulation of the cylindrical battery and heat dissipation system, making subsequent maintenance and repair more convenient. [Attached Image Description]

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a disassembled structural diagram of the cylindrical battery heat dissipation system of the present invention;

[0025] Figure 2 This is a schematic diagram of the arrangement structure of the heat exchange baffle of the present invention;

[0026] Figure 3 This is a cross-sectional view of the heat exchange baffle of the present invention;

[0027] Figure 4 This is a front cross-sectional view of the heat exchange baffle of the present invention;

[0028] Figure 5 This is a schematic diagram of the cylindrical battery module of the present invention;

[0029] Figure 6 This is a schematic diagram of the battery rack structure of the present invention;

[0030] Figure 7 This is a schematic diagram of the battery casing structure of the present invention;

[0031] Figure 8 This is a front cross-sectional view of the cooling assembly of the present invention;

[0032] Figure 9 This is a diagram showing the circulation path of the coolant in this invention.

[0033] Labels in the diagram: 1. Battery bottom cover; 2. Battery casing; 3. Cylindrical battery module; 31. Battery rack; 32. Ventilation perforation; 33. First porous heat exchange medium; 34. Cylindrical lithium battery; 35. Assembly base plate; 36. Assembly bolt; 37. Battery slot; 4. Cooling fan; 5. Heat exchange baffle; 6. Top cover; 7. Thermal management box; 8. Cooling assembly; 81. Heat exchange frame; 82. Serpentine heat exchange tube; 83. Heat exchange fan; 9. Locking buckle 10. Coolant reservoir; 11. Lock on the tank door; 12. Fastening lock hole; 13. Insulating pad; 14. Small circulating pump; 15. Injection pipe; 16. First guide pipe; 17. Second guide pipe; 18. Third guide pipe; 19. Return pipe; 20. Second porous heat exchange medium; 21. Guide cavity; 22. Return cavity; 23. Thermal management controller; 24. Temperature detector; 25. Ventilation grille; 26. Reserved notch; 27. Fastening bolt.

Detailed Implementation Methods

[0034] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described in this specification are merely for explaining the invention and are not intended to limit the invention.

[0035] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0036] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0037] See Figure 1-9In an embodiment of the present invention, a cylindrical battery heat dissipation system based on porous media is provided, including a battery bottom cover 1 and a battery casing 2 disposed opposite to the battery bottom cover 1. An insulating pad 13 is fixedly disposed at the center of the top of the battery bottom cover 1, and uniformly distributed heat exchange baffles 5 are fixedly disposed on the insulating pad 13. A cylindrical battery module 3 for fixing cylindrical batteries is provided between two adjacent heat exchange baffles 5. The cylindrical battery module 3 includes a battery rack 31 and a ventilation hole 32 opened in the middle of the battery rack 31. A first porous heat exchange medium 33 extending into the ventilation hole 32 is fixedly disposed on both sides of the battery rack 31. A uniformly distributed battery slot 37 is opened on the outer side of the first porous heat exchange medium 33. A cylindrical lithium battery 34 is engaged and connected inside the battery slot 37. A guide cavity 21 and a return cavity 22 are opened inside the heat exchange baffles 5. A second porous heat exchange medium 33 is fixedly disposed on both sides of the heat exchange baffles 5. The heat exchange medium 20 is porous. A second guide pipe 17 is fixedly connected between two adjacent guide chambers 21. A first guide pipe 16 is fixedly connected between two adjacent return chambers 22. A third guide pipe 18 is fixedly connected between one of the guide chambers 21 and the return chamber 22. A cooling component 8 for heat exchange of coolant and a coolant tank 10 are fixedly installed on one side of the top of the battery bottom cover 1. A small circulation pump 14 is fixedly installed on the top of the coolant tank 10. The outlet of the small circulation pump 14 is fixedly connected to an injection pipe 15. One end of the injection pipe 15 is fixedly connected to the inside of the guide chamber 21. A return pipe 19 is fixedly connected to the front of the return chamber 22. The heat exchange baffle 5 is wavy. The inner side of the second porous heat exchange medium 20 is in close contact with the guide chamber 21 and the return chamber 22. The guide chamber 21 and the return chamber 22 are symmetrically distributed inside the heat exchange baffle 5. The heat exchange baffle 5 is set in close contact with the cylindrical lithium battery 34.

[0038] In use, the heat exchange baffle 5 is set in a wavy shape, which allows the cooling water to flow a longer path inside the heat exchange baffle 5 and a larger contact area between the heat exchange baffle 5 and the cylindrical battery, thereby improving the heat exchange effect. The cooling water is an electronic fluorinated liquid, which has a significant heat dissipation effect and can ensure the stability of the working environment of the cylindrical battery.

[0039] See Figure 1 , Figure 5 , Figure 6 and Figure 7 Furthermore, both sides of the bottom end of the battery rack 31 are fixedly provided with mounting base plates 35, and mounting bolts 36 are threadedly connected to the mounting base plates 35. The mounting base plates 35 are fixedly mounted on the insulating pad 13 by the mounting bolts 36. The outer periphery of the battery bottom cover 1 is provided with evenly distributed fastening holes 12. The outer periphery of the bottom of the battery casing 2 is fixedly provided with a locking plate 9, and evenly distributed fastening bolts 27 are threadedly connected to the locking plate 9. The fastening bolts 27 are set one-to-one with the fastening holes 12.

[0040] When using the battery module, first fix the cylindrical battery module 3 to the insulating pad 13 with the mounting bolts 36, then insert the heat exchange partition 5 between the adjacent cylindrical battery modules 3, connect them through the flow guide pipe, and then fasten the battery cover 2 and secure it with the fastening bolts 27. The cover-type fastening method is used to encapsulate the cylindrical battery and the heat dissipation system, making subsequent maintenance and repair more convenient.

[0041] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 8 and Figure 9 Furthermore, the top of the battery casing 2 is hinged with an upper cover 6, and a thermal management box 7 is fixedly installed in the middle of the upper cover 6. A thermal management controller 23 is fixedly installed inside the thermal management box 7. A door lock 11 is fixedly installed at one end of the upper cover 6. The cooling assembly 8 includes a heat exchange frame 81 and a serpentine heat exchange tube 82 fixedly installed on the heat exchange frame 81. A heat exchange fan 83 is fixedly installed on the inner side of the heat exchange frame 81. One end of the return pipe 19 is fixedly connected to one end of the serpentine heat exchange tube 82. The other end of the serpentine heat exchange tube 82 is fixedly connected to the inside of the coolant tank 10. The heat exchange fan 83 is electrically connected to the thermal management controller 23. A temperature detector 24 located inside the battery casing 2 is fixedly installed at the bottom of the upper cover 6. The temperature detector 24 is electrically connected to the thermal management controller 23. A reserved notch 26 is provided on one side of the battery casing 2. The reserved notch 26 is provided on the heat exchange frame 81.

[0042] In use, the small circulating pump 14 continuously injects the cooling water in the coolant tank 10 into the guide cavity 21 in the heat exchange baffle 5 through the injection pipe 15, and then continuously circulates in the guide cavity 21 of multiple heat exchange baffles 5 through the second guide pipe 17, flows into the return cavity 22 through the third guide pipe 18, and continuously circulates in the return cavity 22 at the bottom of the heat exchange baffle 5 through the first guide pipe 16. After the coolant is cooled by the cooling component 8, it flows back to the coolant tank 10 to complete the circulating heat exchange.

[0043] See Figure 1 and Figure 7 Furthermore, a cooling fan 4 is fixedly installed on the front of the battery casing 2, and evenly distributed ventilation grilles 25 are provided on the back of the battery casing 2. The cooling fan 4 is positioned directly opposite the ventilation holes 32, and the cooling fan 4 is electrically connected to the thermal management controller 23.

[0044] In use, the cooling fan 4 continuously introduces air from outside the battery casing 2 into the battery casing 2, and the air circulates continuously inside the battery rack 31 through the ventilation holes 32, which will carry away the heat from the surface of the first porous heat exchange medium 33, thus achieving the purpose of ventilation and heat exchange.

[0045] In practical use, when the temperature detector 24 detects that the temperature inside the battery casing 2 has reached the set value during the operation of the battery module, the cooling fan 4 will start working. The cooling fan 4 continuously introduces air from outside the battery casing 2 into the battery casing 2 and circulates continuously inside the battery rack 31 through the ventilation holes 32. Since the cylindrical lithium battery 34 is directly installed on the first porous heat exchange medium 33, the heat generated will be conducted through the first porous heat exchange medium 33. The circulation of outside air in the ventilation holes 32 will carry away the heat on the surface of the first porous heat exchange medium 33 and discharge it from the battery casing 2 through the ventilation grille holes 25, thus achieving the purpose of ventilation and heat exchange.

[0046] The small circulating pump 14 and the heat exchange fan 83 are working. The small circulating pump 14 continuously injects the cooling water in the coolant tank 10 into the guide cavity 21 in the heat exchange baffle 5 through the injection pipe 15, and continuously flows through the guide cavity 21 of multiple heat exchange baffles 5 through the second guide pipe 17. After flowing to the end heat exchange baffle 5, it flows into the return cavity 22 through the third guide pipe 18, and continuously flows through the return cavity 22 at the bottom of the heat exchange baffle 5 through the first guide pipe 16. The wavy heat exchange baffle 5, through the second porous heat exchange medium 20, has one side in contact with the cylindrical battery and the other side in close contact with the heat exchange baffle 5. The heat generated is transferred to the cooling water and flows with the water into the serpentine heat exchange tube 82. The heat exchange fan 83 blows directly at the serpentine heat exchange tube 82, blowing the heat in the cooling water out of the battery casing 2 through the reserved gap 26. Finally, the cooling water flows back into the coolant tank 10, completing the heat exchange work.

[0047] Relying on an excellent ventilation system and a coolant circulation system that flows closely to the cylindrical lithium battery 34, combined with porous media for heat transfer, it can dissipate heat quickly and efficiently, meet the heat dissipation requirements of large battery modules, has a wider range of applications, and is easy and efficient to maintain.

[0048] The present invention is not limited to the description in the specification and embodiments, and thus other advantages and modifications can be readily realized by those skilled in the art. Therefore, the present invention is not limited to the specific details, representative devices and illustrated examples shown and described herein without departing from the spirit and scope of the general concept as defined by the claims and their equivalents.

Claims

1. A cylindrical battery heat dissipation system based on porous media, comprising a battery bottom cover (1) and a battery casing (2) disposed opposite to the battery bottom cover (1), characterized in that, An insulating pad (13) is fixedly installed at the center of the top of the battery bottom cover (1). A uniformly distributed heat exchange baffle (5) is fixedly installed on the insulating pad (13). A cylindrical battery module (3) for fixing cylindrical batteries is provided between two adjacent heat exchange baffles (5). The cylindrical battery module (3) includes a battery rack (31) and a ventilation hole (32) opened in the middle of the battery rack (31). A first porous heat exchange medium (33) extending into the ventilation hole (32) is fixedly installed on both sides of the battery rack (31). A uniformly distributed battery slot (37) is opened on the outer side of the first porous heat exchange medium (33). A cylindrical lithium battery (34) is engaged and connected inside the battery slot (37). A flow guiding cavity (21) and a return cavity (22) are opened inside the heat exchange baffle (5). A second porous heat exchange medium (20) is fixedly installed on both sides of the plate (5). A second guide pipe (17) is fixedly connected between two adjacent guide chambers (21). A first guide pipe (16) is fixedly connected between two adjacent return chambers (22). A third guide pipe (18) is fixedly connected between one of the guide chambers (21) and the return chamber (22). A cooling component (8) for heat exchange of coolant and a coolant tank (10) are fixedly installed on one side of the top of the battery bottom cover (1). A small circulation pump (14) is fixedly installed on the top of the coolant tank (10). A flow injection pipe (15) is fixedly connected to the outlet of the small circulation pump (14). One end of the flow injection pipe (15) is fixedly connected to the inside of the guide chamber (21). A return pipe (19) is fixedly connected to the front of the return chamber (22).

2. The cylindrical battery heat dissipation system based on porous media as described in claim 1, characterized in that, The battery rack (31) has mounting base plates (35) fixedly installed on both sides of its bottom end. The mounting base plates (35) are threaded with mounting bolts (36), and the mounting base plates (35) are fixedly installed on the insulating pad (13) by the mounting bolts (36).

3. The cylindrical battery heat dissipation system based on porous media as described in claim 1, characterized in that, The top of the battery casing (2) is hinged with an upper cover (6), and a thermal management box (7) is fixedly installed in the middle of the upper cover (6). A thermal management controller (23) is fixedly installed inside the thermal management box (7), and a door lock (11) is fixedly installed at one end of the upper cover (6).

4. The cylindrical battery heat dissipation system based on porous media as described in claim 3, characterized in that, The cooling assembly (8) includes a heat exchange frame (81) and a serpentine heat exchange tube (82) fixedly mounted on the heat exchange frame (81). A heat exchange fan (83) is fixedly installed on the inner side of the heat exchange frame (81). One end of the return pipe (19) is fixedly connected to one end of the serpentine heat exchange tube (82). The other end of the serpentine heat exchange tube (82) is fixedly connected to the interior of the coolant tank (10). The heat exchange fan (83) is electrically connected to the thermal management controller (23).

5. A cylindrical battery heat dissipation system based on porous media as described in claim 3, characterized in that, A cooling fan (4) is fixedly installed on the front of the battery casing (2), and a ventilation grille (25) is provided on the back of the battery casing (2). The cooling fan (4) is positioned directly opposite the ventilation perforation (32), and the cooling fan (4) is electrically connected to the thermal management controller (23).

6. The cylindrical battery heat dissipation system based on porous media as described in claim 3, characterized in that, A temperature detector (24) is fixedly installed at the bottom of the upper cover (6) inside the battery casing (2), and the temperature detector (24) is electrically connected to the thermal management controller (23).

7. The cylindrical battery heat dissipation system based on porous media as described in claim 1, characterized in that, The heat exchange baffle (5) is wavy, and the inner side of the second porous heat exchange medium (20) is closely attached to the flow guide cavity (21) and the return cavity (22). The flow guide cavity (21) and the return cavity (22) are symmetrically distributed inside the heat exchange baffle (5).

8. The cylindrical battery heat dissipation system based on porous media as described in claim 1, characterized in that, The heat exchange partition (5) is set in close contact with the cylindrical lithium battery (34).

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