A heat-dissipating modular lithium battery pack

Abstract

This invention relates to the field of modular lithium battery pack technology, specifically a heat-dissipating modular lithium battery pack, including a battery compartment. Multiple battery packs are fixedly installed inside the battery compartment. Multiple heat dissipation fins are fixedly installed on the outer surface of a heat dissipation pipe, and the heat dissipation fins are tightly fitted to the outer surface of the battery cells around the heat dissipation pipe. A high-temperature power-off device is installed inside the heat dissipation pipe. A water inlet pipe is fixedly installed at the bottom inner side of the battery compartment, and the output end of the water inlet pipe is fixedly connected to the output end of the heat dissipation device. Multiple branch pipes are fixedly connected to the outer surface of the water inlet pipe, and the branch pipes are fixedly connected to the bottom end of the heat dissipation pipe. By pulling the connecting plug downwards with a traction rod, the connecting cavity connects the upper and lower chambers of the stabilizing ring, thereby increasing the volume of coolant flow, enabling it to carry away more heat, expanding the coolant flow diameter, increasing the coolant flow rate, and helping to remove the heat generated by the battery pack more quickly, thus reducing the temperature of local high-temperature areas.

Description

Technical Field

[0001] This invention relates to the field of modular lithium battery pack technology, specifically a heat-dissipating modular lithium battery pack. Background Technology

[0002] With the rapid development of new energy technologies, especially the widespread application of electric vehicles, energy storage systems, and portable electronic devices, lithium batteries, as a type of battery with high energy density, long lifespan, and relatively light weight, have become an important energy storage and supply method. However, lithium batteries have certain thermal management issues during use, especially in high-power applications. As the battery discharges and charges, the internal temperature of the battery pack gradually increases. Excessive temperature not only reduces the battery's lifespan but may also trigger thermal runaway, leading to safety accidents. Therefore, effectively dissipating heat from lithium battery packs has become a key technology for improving battery pack safety and performance.

[0003] A search revealed that prior art publication number CN106299535A discloses a battery pack heat dissipation system, including an outer frame. Several battery modules are housed inside the outer frame, and these modules can be moved by pushing and pulling within the frame. Two sets of fixing posts, A and B, are installed on the ends of the battery modules that contact the back of the outer frame. These fixing posts are hollow and communicate with the interior of the battery modules. An air inlet pipe and an air outlet pipe are located on the back of the outer frame. The air inlet pipe has slots for accommodating the A set of fixing posts, and the air outlet pipe has slots for accommodating the B set of fixing posts. The air inlet pipe has only one open end, with an air inlet column communicating with it. The air outlet pipe also has only one open end, with an air outlet column communicating with it. A locking device is installed between the battery modules and the outer frame. This battery pack heat dissipation system effectively reduces the size of the battery pack system while ensuring excellent heat dissipation performance.

[0004] Therefore, based on the above search and combined with existing technologies, when the above solution is in use, if the temperature of the battery released during long-term use reaches a certain critical point and the heat dissipation is ineffective, and if the power is not cut off in time, the internal chemical reaction of the battery will be accelerated, further generating heat, eventually leading to thermal runaway and forming an uncontrollable chain reaction, which may cause fire or even explosion, posing a huge threat to the equipment and the surrounding environment. To this end, we propose a heat dissipation modular lithium battery pack. Summary of the Invention

[0005] The purpose of this invention is to provide a heat-dissipating modular lithium battery pack to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a heat-dissipating modular lithium battery pack, comprising a battery compartment, wherein multiple battery packs are fixedly installed at the inner end of the battery compartment in a rectangular array arrangement, a heat dissipation device is fixedly installed at the right end of the battery compartment, and heat dissipation pipes for continuous cooling of the battery cells are fixedly installed inside each battery pack, a return water pipe is provided at the inner end of the battery compartment, the output end of the return water pipe is fixedly connected to the input end of the heat dissipation device, a branch pipe is fixedly connected to the upper end of the heat dissipation pipe, and the branch pipes are all fixedly connected to the return water pipe, coolant for heat transfer flows inside the heat dissipation pipe and the return water pipe, multiple heat dissipation fins are fixedly installed on the outer surface of the heat dissipation pipe, and the heat dissipation fins are tightly attached to the outer surface of the battery cells around the heat dissipation pipe, a high-temperature power-off device is provided inside the heat dissipation pipe, a water inlet pipe is fixedly installed at the inner bottom end of the battery compartment, the output end of the water inlet pipe is fixedly connected to the output end of the heat dissipation device, multiple shunt pipes are fixedly connected to the outer surface of the water inlet pipe, and the shunt pipes are fixedly connected to the bottom end of the heat dissipation pipe.

[0007] As a further embodiment of the present invention, the inner end of the heat dissipation fins is provided with a plurality of stabilizing holes, and a heat receiving cylinder is fixedly installed in each of the stabilizing holes. The heat receiving cylinders are arranged in a ring shape, and a guide rod is fixedly installed in the inner end of the heat receiving cylinders. A piston block is slidably installed on the outer surface of the guide rod. A liquid that can expand when heated is filled between the upper part of the piston block and the heat receiving cylinder. The liquid that expands when heated can quickly sense heat and conduct it to the piston block, thereby enhancing the heat dissipation effect through the movement of the piston.

[0008] As a further embodiment of the present invention, the high-temperature power-off device includes a stabilizing tube, which is fixedly installed at the inner end of the heat dissipation tube, and a conductive tube is fixedly installed at the upper inner end of the heat dissipation tube. The conductive tube is connected to the branch tube. Mounting rings are fixedly installed at both the upper and lower ends of the outer surface of the stabilizing tube. Multiple bimetallic strips that can deform when heated are arranged around the periphery of the mounting rings. When the bimetallic strips deform when heated, they can trigger the power-off device to automatically cut off the power supply when the battery temperature is too high, thereby avoiding safety accidents caused by overheating.

[0009] As a further embodiment of the present invention, a rotating shaft is rotatably mounted at the bottom end of the bimetallic strip, and the rotating shaft is rotatably connected to the mounting ring below the stabilizing tube, while a stabilizing ring is fixedly mounted at the upper end of the stabilizing tube.

[0010] As a further embodiment of the present invention, the outer surface of the stabilizing ring is provided with a plurality of holes of different sizes, wherein a guide plug is slidably installed in each of the large holes, while the small holes are used for normal flow of coolant. A traction rod is rotatably installed at the bottom end of each guide plug, and the end of the traction rod away from the guide plug is rotatably connected to the upper end of the bimetallic strip.

[0011] As a further embodiment of the present invention, a stabilizing cylinder is fixedly installed at the bottom inner side of the stabilizing tube, a connecting rod is passed through the inner end of the stabilizing tube, a contact block is fixedly connected to the bottom end of the connecting rod, and a contact piece for clamping the contact block is fixedly installed at the upper end of the stabilizing cylinder. The contact piece clamps the contact block, which can effectively fix the position of the connecting rod, ensure that the internal components will not loosen or shift during operation, and improve the reliability of the overall system.

[0012] As a further embodiment of the present invention, a telescopic tube is fixedly installed at the inner end of the stabilizing cylinder, and a top rod is fixedly connected to the upper end of the telescopic tube. The top rod is connected to the stabilizing cylinder by a return spring, and the top rod corresponds to the connecting rod. A spray pipe is fixedly installed at the inner end of the stabilizing cylinder, and the spray pipe corresponds to the top rod.

[0013] As a further embodiment of the present invention, a locking groove is provided on the outer surface of the contact block, and a plurality of locking rods are rotatably installed on the inner end of the stabilizing cylinder. The locking rods are arranged in a ring shape, and the upper end of the locking rod is engaged in the locking groove. The locking rod and the top rod are connected by a traction line.

[0014] As a further embodiment of the present invention, the conductive tube and the stabilizing tube are connected by a rubber sleeve, and a return groove is provided at one end of the conductive tube near the stabilizing tube, with the upper end of the rubber sleeve located inside the return groove.

[0015] As a further embodiment of the present invention, a sealing ring is fixedly installed on the outer surface of the connecting rod. The sealing ring is located inside the rubber sleeve and corresponds to the return groove. After the connecting rod moves upward, it drives the sealing ring to pass through the return groove.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. When using this invention, the traction rod pulls the conducting plug downward, so that the conducting cavity connects the upper and lower chambers of the stabilizing ring, thereby increasing the volume of coolant flow, enabling it to carry away more heat, expanding the coolant flow diameter, increasing the coolant flow rate, and helping to carry away the heat generated by the battery pack more quickly, thus reducing the temperature of local high-temperature areas.

[0018] 2. When using this invention, if the cell heat continues to rise, the double-helix metal sheet begins to deform due to heat, which pushes the piston block to move downward. By squeezing the coolant inside the heated cylinder into the stabilizing cylinder, the upper end of the push rod pushes the contact block upward. At this time, the contact block and the contact piece are disconnected, thereby preventing the battery pack from continuing to heat up and reducing the risk of thermal runaway due to overheating.

[0019] 3. This invention requires no external power source. It utilizes the thermal expansion characteristics of bimetallic spiral plates to automatically trigger deformation and cut off power when the temperature is too high. It does not rely on any external energy source and is suitable as a passive protection device. It avoids battery capacity decay or permanent damage caused by continuous overheating, and the power-off protection can prevent battery overheating damage. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a heat-dissipating modular lithium battery pack.

[0021] Figure 2 This is a structural diagram of the battery pack section;

[0022] Figure 3 This is a schematic diagram of the internal structure of the battery pack;

[0023] Figure 4 This is a schematic diagram of the structure of heat pipes and heat sink fins;

[0024] Figure 5 This is a schematic diagram of the heat-receiving cylinder portion of the heat dissipation fins.

[0025] Figure 6 This is a schematic diagram of the internal structure of the heating cylinder;

[0026] Figure 7 This is a schematic diagram of the internal structure of the piston block;

[0027] Figure 8 This is a schematic diagram of the internal structure of the heat pipe;

[0028] Figure 9 This is a schematic diagram showing the positional relationship between the bimetallic strip and the stabilizing ring.

[0029] Figure 10 This is a schematic diagram of the internal structure of the stabilizer tube;

[0030] Figure 11 This is a schematic diagram of the internal structure of the stabilizing cylinder;

[0031] Figure 12 This is a schematic diagram of the internal structure of the rubber sleeve.

[0032] In the diagram: 1. Battery compartment; 2. Heat dissipation device; 3. Battery pack; 4. Return water pipe; 5. Branch pipe; 6. Inlet water pipe; 7. Heat dissipation fins; 61. Diverter pipe;

[0033] 101. Heat dissipation pipe; 102. Driving block; 103. Connecting rod; 104. Contact block; 105. Contact piece; 106. Stabilizing cylinder; 107. Injection pipe; 108. Traction line; 109. Push rod; 110. Locking groove; 111. Locking rod; 112. Return spring; 113. Telescopic tube; 114. Stabilizing tube;

[0034] 201. Heating cylinder; 202. Heat-conducting pipe; 203. Double-helix metal sheet; 204. Piston block; 205. Guide rod; 206. Abutment spring; 207. Snap-fit ​​ball; 208. Snap-fit ​​groove;

[0035] 301. Stabilizing ring; 302. Conductor plug; 303. Traction rod; 304. Bimetallic strip; 305. Conductor cavity; 306. Shaft; 307. Mounting ring;

[0036] 501. Conductor tube; 502. Rubber sleeve; 503. Negative pressure cylinder; 504. Plug rod; 505. Sealing ring; 506. Return groove. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Example 1: Please refer to Figures 1-4 A heat-dissipating modular lithium battery pack includes a battery compartment 1. Multiple battery packs 3 are bolted to the inner end of the battery compartment 1 in a rectangular array. A heat dissipation device 2 is fixedly installed at the right end of the battery compartment 1. Specifically, the heat dissipation device 2 is a combination of a radiator, a water pump, cooling pipes (made of copper), and a fan. Its working principle is based on existing mature technology and will not be elaborated upon here. Each battery pack 3 has a heat dissipation pipe 101 (made of aluminum alloy) fixedly installed inside for continuous cooling of the battery cells. A return water pipe 4 is provided at the inner end of the battery compartment 1, and the output end of the return water pipe 4 is fixedly connected to the input end of the heat dissipation device 2. A branch pipe 5 is fixedly connected to the upper end of 1, and the branch pipe 5 is fixedly connected to the return water pipe 4. Cooling liquid for heat transfer flows inside the heat dissipation pipe 101 and the return water pipe 4. The cooling liquid is pure water. The specific heat capacity of pure water is higher than that of other liquids, which makes the heat dissipation efficiency of the battery cell higher. Multiple heat dissipation fins 7 (the heat dissipation fins 7 are made of aluminum alloy) are fixedly installed on the outer surface of the heat dissipation pipe 101. The heat dissipation fins 7 are tightly attached to the outer surface of the battery cell around the heat dissipation pipe 101. In order to achieve higher heat transfer efficiency, thermal grease is applied to the contact area between the heat dissipation fins 7 and the battery cell. The thermal grease can fill the small gaps between the heat dissipation fins 7 and the battery cell.

[0039] When the cell temperature is too high, in order to prevent the high temperature from causing uncontrollable damage to the cell, a high temperature power-off device is installed inside the heat sink 101. A water inlet pipe 6 is fixedly installed at the bottom inner side of the battery compartment 1. The output end of the water inlet pipe 6 is fixedly connected to the output end of the heat sink 2. Multiple branch pipes 61 are fixedly connected to the outer surface of the water inlet pipe 6, and the branch pipes 61 are fixedly connected to the bottom end of the heat sink 101.

[0040] like Figure 4 - Figure 7 As shown, the inner end of the heat dissipation fin 7 is provided with multiple stabilizing holes, and a heat receiving cylinder 201 is fixedly installed in each of the stabilizing holes. The heat receiving cylinder 201 is arranged in a ring shape. A guide rod 205 is fixedly installed at the inner end of the heat receiving cylinder 201. A piston block 204 is slidably installed on the outer surface of the guide rod 205. A high-temperature resistant sealing ring is fixedly fitted on the outer surface of the piston block 204 and is tightly fitted to the inner wall of the heat receiving cylinder 201 to increase airtightness. The space between the piston block 204 and the heat receiving cylinder 201 is filled with a liquid that can expand when heated. The liquid is silicone oil, which is a synthetic non-flammable liquid with high thermal stability and is not flammable. The piston block 204 and the heat receiving cylinder 201 are connected by a double helical metal sheet 203. The double helical metal sheet 203 is composed of two different metals with different coefficients of thermal expansion, which allows it to push the piston block 204 downward when subjected to high temperature.

[0041] The outer surface of the guide rod 205 is provided with a slot 208, and the piston block 204 is slidably mounted with a locking ball 207 at both ends of its inner side. The locking ball 207 is located on the inner wall of the slot 208, and the locking ball 207 and the piston block 204 are connected by abutment springs 206. When the double helical metal sheet 203 is heated and expands, it pushes the piston block 204 to move downward. Since the locking ball 207 is locked in the inner wall of the slot 208, the piston block 204 is blocked from moving downward. Only when the double helical metal sheet 203 is subjected to a sufficiently high temperature and has sufficient pushing force can the piston block 204 be pushed to move downward.

[0042] Example 2: Please refer to Figure 8 , Figure 9A heat dissipation modular lithium battery pack, based on Embodiment 1, includes a high-temperature power-off device comprising a stabilizing tube 114, which is fixedly installed at the inner end of a heat dissipation tube 101. A conductive tube 501 is fixedly installed at the upper inner side of the heat dissipation tube 101, and the conductive tube 501 is connected to a branch tube 5. Mounting rings 307 are fixedly installed at both the upper and lower ends of the outer surface of the stabilizing tube 114. Multiple bimetallic strips 304 that can deform when heated are arranged around the mounting rings 307. The bimetallic strips 304 are composed of two metal strips with different coefficients of thermal expansion. When the heat released by the battery cell during operation is transferred to the outer surface of the heat dissipation tube 101 through the heat dissipation fins 7, the coolant flowing inside the heat dissipation tube 101 cannot carry away the heat in a timely and rapid manner. At this time, the bimetallic strips 304 deform when heated. The coefficient of thermal expansion of the bimetallic strips 304 is lower than that of the double-helix metal strips 203.

[0043] A rotating shaft 306 is rotatably mounted on the bottom end of the bimetallic strip 304, and the rotating shaft 306 is rotatably connected to the mounting ring 307 below the stabilizing tube 114 via a pin. A stabilizing ring 301 is fixedly mounted on the upper end of the stabilizing tube 114. A high-temperature resistant sealing ring is fitted on the outer surface of the stabilizing ring 301 and fits tightly against the inner wall of the heat sink 101. Multiple holes of different sizes are opened on the outer surface of the stabilizing ring 301 and are distributed in a ring shape, with large holes and small holes interspersed. A guide plug 302 is slidably installed in each of the large holes, while the small holes are used for normal flow of coolant. A traction rod 303 is rotatably mounted on the bottom end of each guide plug 302, and the traction rod 303 is away from the guide plug 302. One end of 02 is rotatably connected to the upper end of the bimetallic strip 304. Specifically, a limiting block is fixedly installed on the outer surface of the conductive plug 302. The limiting block is located above the stabilizing ring 301 to prevent the conductive plug 302 from moving down excessively. A conductive cavity 305 is opened on the outer surface of the conductive plug 302. The conductive cavity 305 is connected to the chamber above the stabilizing ring 301. If the temperature inside the heat sink 101 rises, the bimetallic strip 304 will also begin to deform and pull the conductive plug 302 down through the traction rod 303, so that the conductive cavity 305 connects the upper and lower chambers of the stabilizing ring 301, thereby increasing the volume of coolant flow and enabling it to carry away more heat.

[0044] Please see Figure 10 , Figure 11A stabilizing cylinder 106 is fixedly welded to the bottom inner side of the stabilizing tube 114. A connecting rod 103 passes through the inner end of the stabilizing tube 114, and a contact block 104 is fixedly connected to the bottom end of the connecting rod 103. A contact piece 105 for clamping the contact block 104 is fixedly installed on the upper end of the stabilizing cylinder 106. Specifically, the contact piece 105 is made of copper, and the contact block 104 is also made of copper. The contact piece 105 is connected to the battery pack 3 by a wire, while the contact block 104 is connected to the discharge interface of the battery compartment 1 by a wire. The inner end of the stabilizing cylinder 106 is fixedly installed with a telescopic tube 113, which is made of high-temperature resistant rubber. The upper end of the telescopic tube 113 is fixedly connected with a top rod 109. The top rod 109 is connected to the stabilizing cylinder 106 through a return spring 112, and the top rod 109 corresponds to the connecting rod 103. Specifically, the telescopic tube 113 divides the inner cavity of the stabilizing cylinder 106 into upper and lower chambers. The inner end of the stabilizing cylinder 106 is fixedly installed with a spray pipe 107, and the spray pipe 107 corresponds to the top rod 109.

[0045] like Figure 6 , Figure 8 , Figure 11 As shown, more specifically, the outer surfaces of the stabilizing tube 114 and the heat dissipation tube 101 are provided with multiple through holes. The bottom end of the heating cylinder 201 is fixedly connected to the heat conduction tube 202, and the heat conduction tube 202 passes through the through holes on the outer surfaces of the heat dissipation tube 101 and the stabilizing tube 114 respectively and is fixedly connected to the stabilizing cylinder 106. The chamber below the piston block 204 and the chamber below the telescopic tube 113 in the heating cylinder 201 are filled with coolant. When the piston block 204 moves downward, it squeezes the coolant to flow into the stabilizing cylinder 106 through the heat conduction tube 202 and sprays it out through the spray pipe 107, and then pushes the push rod 109 to move upward.

[0046] The outer surface of the contact block 104 is provided with a locking groove 110. Multiple locking rods 111 are rotatably installed on the inner end of the stabilizing cylinder 106. The locking rods 111 are arranged in a ring and are located above the telescopic tube 113. The upper end of the locking rod 111 is engaged in the locking groove 110. The locking rod 111 is connected to the top rod 109 through a traction line 108. The traction line 108 is a metal wire wrapped with an insulating layer. The traction line 108 is connected at a position slightly above the center of the locking rod 111 to prevent the locking rod 111 from being unable to rotate after the top rod 109 moves downward.

[0047] like Figure 4 , Figure 10 , Figure 12As shown, a drag block 102 for easy gripping is fixedly installed on the upper end of the connecting rod 103 by bolts. The drag block 102 is located above the heat dissipation pipe 101 and is made of insulating material. The conducting pipe 501 and the stabilizing pipe 114 are connected by a rubber sleeve 502, which is made of high-temperature resistant rubber. A return groove 506 is opened at one end of the conducting pipe 501 near the stabilizing pipe 114. The upper end of the rubber sleeve 502 is located inside the return groove 506. A sealing ring 505 is fixedly installed on the outer surface of the connecting rod 103. The sealing ring 505 is located inside the rubber sleeve 502 and corresponds to the return groove 506. After the connecting rod 103 moves upward, it drives the sealing ring 505 to pass through the return groove 506 and blocks the return groove 506 under the action of the rubber sleeve 502.

[0048] A negative pressure cylinder 503 is fixedly installed at the inner end of the conduit 501. A stopper rod 504 is slidably installed at the output end of the negative pressure cylinder 503. The end of the stopper rod 504 away from the negative pressure cylinder 503 is fixedly connected to the sealing ring 505 by bolts. After the stopper rod 504 moves downward, negative pressure is generated inside the negative pressure cylinder 503.

[0049] The working principle of this invention is:

[0050] During the discharge process of battery pack 3, the heat generated is transferred to the outer surface of heat pipe 101 through heat dissipation fins 7. Then, the internal working of heat dissipation device 2 starts to work, continuously drawing out the coolant inside heat pipe 101 through return water pipe 4 and branch pipe 5. When the cells inside battery pack 3 are discharged for a long time, a large amount of heat will be generated, causing the temperature inside heat pipe 101 to rise. At this time, bimetallic strip 304 is deformed by heat. During the deformation process, the traction rod 303 pulls the conducting plug 302 downward, so that the conducting cavity 305 connects the upper and lower chambers of the stabilizing ring 301, thereby increasing the volume of coolant flow and enabling it to carry away more heat.

[0051] If the battery cell continues to heat up, there is a risk of explosion if it is used continuously. At this time, the double-helix metal sheet 203 inside the heating cylinder 201 begins to deform due to heat, which pushes the piston block 204 downward. This squeezes the coolant inside the heating cylinder 201 into the stabilizing cylinder 106, and then sprays it out through the injection pipe 107, pushing the push rod 109 upward. Subsequently, the upper end of the push rod 109 pushes the contact block 104 upward. At this time, the locking rod 111 begins to loosen. Simultaneously, the negative pressure cylinder 50... When the internal pressure is negative, the plug rod 504 moves upward. The plug rod 504 drives the sealing ring 505 and the connecting rod 103 to move upward. At this time, the contact block 104 and the contact piece 105 are disconnected. After the connecting rod 103 moves upward, it drives the sealing ring 505 to pass through the inside of the return groove 506. Under the action of the rubber sleeve 502, the return groove 506 is blocked, so that the coolant no longer flows, allowing the battery cell to cool naturally and avoiding the sudden contraction of the outer surface of the battery cell when it is cold, which would cause irreversible damage to the battery cell.

[0052] If power needs to be restored, press the drag block 102 to move the connecting rod 103 downward. Then the contact block 104 will be locked back into the contact piece 105 and push the top rod 109 downward. Then, the locking rod 111 will be pulled in the direction of mutual approach through the traction line 108 and locked into the locking groove 110 on the outer surface of the contact block 104. The plug rod 504 will be pulled, so that the negative pressure cylinder 503 returns to a negative pressure state.

[0053] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A heat-dissipating modular lithium battery pack, comprising a battery compartment (1), characterized in that: Multiple battery packs (3) are fixedly installed at the inner end of the battery compartment (1). The battery packs (3) are arranged in a rectangular array. A heat dissipation device (2) is fixedly installed at the right end of the battery compartment (1). A heat dissipation pipe (101) for continuous cooling of the battery cells is fixedly installed inside each battery pack (3). A return water pipe (4) is provided at the inner end of the battery compartment (1). The output end of the return water pipe (4) is fixedly connected to the input end of the heat dissipation device (2). A branch pipe (5) is fixedly connected to the upper end of the heat dissipation pipe (101), and the branch pipe (5) is fixedly connected to the return water pipe (4). The heat dissipation pipe (101) and the return water pipe (4) are fixedly connected to each other. The interior of each heat exchanger is filled with coolant for heat transfer. Multiple heat dissipation fins (7) are fixedly installed on the outer surface of the heat dissipation pipe (101), and the heat dissipation fins (7) are tightly attached to the outer surface of the battery cell around the heat dissipation pipe (101). A high-temperature power-off device is installed inside the heat dissipation pipe (101). A water inlet pipe (6) is fixedly installed at the bottom inner side of the battery compartment (1). The output end of the water inlet pipe (6) is fixedly connected to the output end of the heat dissipation device (2). Multiple branch pipes (61) are fixedly connected to the outer surface of the water inlet pipe (6), and the branch pipes (61) are fixedly connected to the bottom end of the heat dissipation pipe (101). The high-temperature power-off device includes a stabilizing tube (114), which is fixedly installed at the inner end of the heat dissipation tube (101). A conductive tube (501) is fixedly installed at the upper inner side of the heat dissipation tube (101). The conductive tube (501) is connected to the branch tube (5). Mounting rings (307) are fixedly installed at both the upper and lower ends of the outer surface of the stabilizing tube (114). A plurality of bimetallic strips (304) that can deform when heated are arranged around the mounting rings (307). The bottom end of the bimetallic strip (304) is rotatably mounted with a rotating shaft (306), and the rotating shaft (306) is rotatably connected to the mounting ring (307) below the stabilizing tube (114). The upper end of the stabilizing tube (114) is fixedly mounted with a stabilizing ring (301). The outer surface of the stabilizing ring (301) has multiple holes of different sizes. A guide plug (302) is slidably installed in each of the large holes, while the small holes are used for normal flow of coolant. A traction rod (303) is rotatably installed at the bottom end of each guide plug (302), and the end of the traction rod (303) away from the guide plug (302) is rotatably connected to the upper end of the bimetallic strip (304).

2. The heat-dissipating modular lithium battery pack according to claim 1, characterized in that: The inner end of the heat dissipation fin (7) is provided with multiple stabilizing holes, and a heating cylinder (201) is fixedly installed in each stabilizing hole. The heating cylinder (201) is arranged in a ring shape. A guide rod (205) is fixedly installed at the inner end of the heating cylinder (201). A piston block (204) is slidably installed on the outer surface of the guide rod (205). The space between the piston block (204) and the heating cylinder (201) is filled with a liquid that can expand when heated.

3. A heat-dissipating modular lithium battery pack according to claim 1, characterized in that: A stabilizing cylinder (106) is fixedly installed at the bottom inner side of the stabilizing tube (114). A connecting rod (103) passes through the inner end of the stabilizing tube (114). A contact block (104) is fixedly connected to the bottom end of the connecting rod (103). A contact piece (105) for clamping the contact block (104) is fixedly installed at the upper end of the stabilizing cylinder (106).

4. A heat-dissipating modular lithium battery pack according to claim 3, characterized in that: A telescopic tube (113) is fixedly installed at the inner end of the stabilizing cylinder (106), and a top rod (109) is fixedly connected to the upper end of the telescopic tube (113). The top rod (109) is connected to the stabilizing cylinder (106) by a return spring (112), and the top rod (109) corresponds to the connecting rod (103). A spray pipe (107) is fixedly installed at the inner end of the stabilizing cylinder (106), and the spray pipe (107) corresponds to the top rod (109).

5. A heat-dissipating modular lithium battery pack according to claim 4, characterized in that: The outer surface of the contact block (104) is provided with a locking groove (110), and the inner end of the stabilizing cylinder (106) is rotatably equipped with a plurality of locking rods (111). The locking rods (111) are arranged in a ring shape, and the upper end of the locking rods (111) is engaged in the locking groove (110). The locking rods (111) and the top rod (109) are connected by a traction line (108).

6. A heat-dissipating modular lithium battery pack according to claim 1, characterized in that: The conductive tube (501) and the stabilizing tube (114) are connected by a rubber sleeve (502). A return groove (506) is provided at one end of the conductive tube (501) near the stabilizing tube (114), and the upper end of the rubber sleeve (502) is located inside the return groove (506).

7. A heat-dissipating modular lithium battery pack according to claim 3, characterized in that: A sealing ring (505) is fixedly installed on the outer surface of the connecting rod (103). The sealing ring (505) is located inside the rubber sleeve (502) and corresponds to the return groove (506). After the connecting rod (103) moves upward, it drives the sealing ring (505) to pass through the return groove (506).

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