Protective cylindrical lithium battery pack

Abstract

The application relates to the field of battery packs, in particular to a protective cylindrical lithium battery pack. The protective cylindrical lithium battery pack comprises a shell, a cover plate detachably connected to the shell, a control system arranged in the shell, and a control circuit board of the control system, wherein an encoder is integrated on the control circuit board. The installation frame is clamped and fixed by the clamping plate, so that the installation frame is prevented from shaking or shifting during use of the electric vehicle, the positive and negative electrode connection ends of the lithium battery are prevented from loosening and breaking, the normal use of the lithium battery is prevented from being affected, and the risk of battery out-of-control is prevented from being caused, and the problems that old batteries are difficult to disassemble and new batteries are difficult to install due to screw and thread hole slippage in the prior art are solved.

Description

Technical Field

[0001] This invention relates to the field of battery packs, and more particularly to a protective cylindrical lithium battery pack. Background Technology

[0002] In the field of new energy transportation, electric vehicles have become one of the mainstream choices for short-distance commuting and daily travel due to their core advantages of energy conservation, environmental protection, low travel costs, and convenience. In the selection of power batteries for electric vehicles, cylindrical lithium batteries have become the primary type of power battery suitable for electric vehicles due to their regular structure, high energy density, long cycle life, good cell consistency, and mature large-scale production. They are widely used in various electric two-wheelers, three-wheelers, and some low-speed electric vehicles.

[0003] However, the bumps and vibrations generated during the riding of electric vehicles can cause the lithium battery to shake and shift, which can lead to loosening or even breakage of the positive and negative terminals. This not only affects the normal use of the lithium battery, but may also cause safety risks such as battery thermal runaway. When the lithium battery is damaged, users usually replace it and then use the electric vehicle again. However, most lithium batteries in existing electric vehicles use a screw fastening structure. After long-term use, the screws and threaded holes are prone to stripping, wear or corrosion, making it difficult to disassemble old batteries and inconvenient to install new batteries. Summary of the Invention

[0004] To overcome the shortcomings of lithium batteries being prone to shaking and displacement during electric vehicle riding, which affects their normal use, and the fact that existing lithium batteries mostly use screw fastening structures, which are prone to stripping, wear or corrosion of screws and threaded holes after long-term use, making it difficult to disassemble old batteries and inconvenient to install new batteries, this invention provides a protective cylindrical lithium battery pack.

[0005] The technical solution is as follows: A protective cylindrical lithium battery pack includes a housing; a cover plate detachably connected to the housing; a control system inside the housing, the control system including a control circuit board with an integrated encoder; several mounting frames installed inside the housing for placing cylindrical lithium batteries, the mounting frames being made of a thermally conductive material; several placement slots inside the housing; two clamping plates between every two adjacent placement slots; each clamping plate having a clamping surface and a heat dissipation surface; the clamping surface of each clamping plate facing the placement slot; a heat dissipation groove formed between two opposing heat dissipation surfaces; several springs fixedly connected to each clamping plate and the housing; several heat-conducting plates fixedly connected to each clamping plate; the heat-conducting plates on adjacent clamping plates are staggered vertically, and the heat-conducting plates protrude beyond the heat dissipation surface of the clamping plates; a heat dissipation component for cooling the lithium batteries connected to the housing; and a fire extinguishing component for extinguishing fires on the mounting frames connected inside the housing.

[0006] As an improvement to the above solution, the heat dissipation assembly includes a fan box fixed to the housing; each fan box has several electric push rods fixedly connected inside; each electric push rod has a sliding block fixedly connected to its telescopic end; each sliding block slides through the corresponding fan box; each sliding block is inserted into the corresponding heat dissipation slot and contacts the corresponding clamping plate; each sliding block has a through slot; each fan box communicates with the corresponding through slot; each through slot communicates with the corresponding heat dissipation slot.

[0007] As an improvement to the above solution, the fire extinguishing assembly includes a fire extinguishing box connected inside the housing; each fire extinguishing box has several nozzles fixedly connected inside, and each nozzle is equipped with a spray valve; each nozzle faces a corresponding placement slot; each placement slot has a smoke sensor fixedly connected inside, and each smoke sensor is electrically connected to the spray valve inside the corresponding nozzle.

[0008] As an improvement to the above solution, the mounting frame is made of aluminum nitride ceramic.

[0009] As an improvement to the above solution, the heat-conducting plate is made of 6063 aluminum alloy.

[0010] As an improvement to the above solution, several fixing rods are fixed to the shell, and the fixing rods are made of carbon steel; each clamping plate is slidably connected to the corresponding fixing rod.

[0011] As an improvement to the above scheme, each sliding block is provided with a wedge-shaped surface on the side facing the heat dissipation groove.

[0012] As an improvement to the above solution, each fixed rod is provided with a wire groove, and each wire groove is provided with several through slots.

[0013] As an improvement to the above solution, a handle is fixedly attached to the cover plate.

[0014] As an improvement to the above scheme, it also includes a cooling fan; each air box has two air intake slots; each air intake slot has a cooling fan fixedly connected to it; and each through slot is connected to the corresponding air intake slot.

[0015] The present invention has the following advantages: The present invention achieves the clamping and fixing of the mounting frame by the clamping plate, preventing the mounting frame from shaking or shifting during the use of electric vehicles, which could lead to loosening or breakage of the positive and negative terminals of the lithium battery, affecting the normal use of the lithium battery, or even causing the risk of battery runaway. At the same time, it solves the problem in the prior art that the mounting frame is fixed by screws, which makes it difficult to disassemble old batteries and install new batteries due to stripping of screws and threaded holes. After the mounting frame is clamped by the clamping plates, the two opposing clamping surfaces and the heat-conducting plate of the two adjacent clamping plates will come into contact with the mounting frame, thereby providing initial heat dissipation for the lithium battery. At the same time, a heat dissipation groove is formed between the two opposing heat dissipation surfaces. During the use of the lithium battery, the heat dissipation components create a continuous and stable airflow in the heat dissipation groove, which efficiently removes the heat conducted by the heat-conducting plate, thereby achieving active and efficient heat dissipation for the lithium battery and ensuring that the battery operates within a safe temperature range. When the fire extinguishing assembly detects thermal runaway or fire in the lithium battery, the opposing heat dissipation surfaces come into contact with each other, sealing the heat dissipation groove and thus the housing, preventing external airflow from entering. The fire extinguishing assembly then sprays dry powder into the placement groove to extinguish the lithium battery fire. The two opposing clamping surfaces move away from each other, the placement groove expands, and a gap is created between the mounting frame and the clamping surfaces. Therefore, the sprayed dry powder enters the gap between the mounting frame and the clamping surfaces, quickly covering all the lithium batteries in the mounting frame. This ensures the heat dissipation efficiency of the battery pack while reducing the risk of fire or explosion caused by the heat dissipation structure. The change in the shape of the heat dissipation structure achieves multiple safety protections. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the protective cylindrical lithium battery pack of the present invention; Figure 2 This is a three-dimensional structural diagram of the housing, mounting frame, and bellows assembly of the present invention; Figure 3 This is a three-dimensional structural diagram of the combined shell, clamping plate, spring and heat-conducting plate of the present invention. Figure 4 This is a three-dimensional structural diagram of the housing, clamping plate, heat-conducting plate, smoke sensor, and nozzle assembly of the present invention; Figure 5 This is a diagram showing the state of the sliding block being inserted into the heat sink according to the present invention; Figure 6 This is a diagram showing the state of the sliding block pulling out the heat dissipation groove according to the present invention; Figure 7 This is a cross-sectional view of the bellows of the present invention; Figure 8 This is a cross-sectional view of the sliding block of the present invention.

[0017] The labels in the diagram are as follows: 1-Housing, 1001-Fixing rod, 1002-Placement slot, 1003-Heat dissipation slot, 1004-Wire slot, 2-Cover plate, 2001-Handle, 3-Mounting frame, 101-Clamping plate, 10101-Clamping surface, 10102-Heat dissipation surface, 102-Spring, 103-Heat conduction plate, 104-Smoke sensor, 105-Blowbox, 10501-Air inlet slot, 106-Electric push rod, 107-Sliding block, 10701-Through slot, 108-Fire extinguishing box, 109-Nozzle, 201-Cooling fan. Detailed Implementation

[0018] The technical solution will be further described below with reference to specific embodiments. It should be noted that the terms "up," "down," "left," and "right" used in this document refer only to the position of the structure shown in the corresponding drawings. The serial numbers assigned to components in this document, such as "first," "second," etc., are only used to distinguish the described objects and have no sequential or technical meaning. Unless otherwise specified, terms such as "connection" and "linkage" in this application include both direct and indirect connections (linkages).

[0019] Example 1: A protective cylindrical lithium battery pack, such as Figures 1-8 As shown, it includes a housing 1 and a cover plate 2; the cover plate 2 is detachably connected to the housing 1, and a control system is provided inside the housing 1. The control system includes a control circuit board, on which an encoder is integrated. It also includes mounting frames 3, clamping plates 101, springs 102, heat-conducting plates 103, heat dissipation components, and fire extinguishing components; five mounting frames 3 are installed inside the housing 1, and the mounting frames 3 are made of heat-conducting material; five placement slots 1002 are provided inside the housing 1; two clamping plates 101 are provided between every two adjacent placement slots 1002; each clamping plate 101 is provided with a clamping surface 10101 and a heat dissipation surface 10102; the clamping surface 10101 of each clamping plate 101 faces towards Placement slot 1002; a heat dissipation groove 1003 is formed between two opposing heat dissipation surfaces 10102; two springs 102 are fixedly connected between each clamping plate 101 and the housing 1; several heat-conducting plates 103 are fixedly connected to each clamping plate 101; the heat-conducting plates 103 on two adjacent clamping plates 101 are arranged alternately, and the heat-conducting plates 103 protrude from the heat dissipation surface 10102 of the clamping plate 101; a heat dissipation assembly is connected to the housing 1; a fire extinguishing assembly is connected inside the housing 1.

[0020] The heat dissipation assembly includes a fan box 105, an electric push rod 106, and a sliding block 107. A fan box 105 is fixedly connected to both the front and rear sides of the housing 1. Four electric push rods 106 are fixedly connected inside each fan box 105. A sliding block 107 is fixedly connected to the telescopic end of each electric push rod 106. Each sliding block 107 passes through its corresponding fan box 105. Each sliding block 107 is inserted into its corresponding heat dissipation groove 1003 and contacts its corresponding clamping plate 101. Each sliding block 107 has a through groove 10701. Each fan box 105 communicates with its corresponding through groove 10701. Each through groove 10701 communicates with its corresponding heat dissipation groove 1003.

[0021] The fire extinguishing assembly includes a smoke sensor 104, a fire extinguishing box 108, and a nozzle 109; two symmetrically arranged fire extinguishing boxes 108 are fixedly mounted inside the housing 1; each fire extinguishing box 108 has several nozzles 109 fixedly mounted inside, and each nozzle 109 has a spray valve fixedly mounted inside; each nozzle 109 faces the corresponding placement slot 1002; each placement slot 1002 has a smoke sensor 104 fixedly mounted inside, and each smoke sensor 104 is electrically connected to the spray valve in the corresponding nozzle 109.

[0022] The working principle of this invention is as follows: Considering that electric vehicles experience bumps and vibrations during riding, causing the lithium battery to shake and shift, which can lead to loosening or even breakage of the positive and negative terminals, this not only affects the normal charging and discharging of the lithium battery but may also cause safety risks such as battery thermal runaway. Furthermore, when a lithium battery is severely damaged, users usually replace it before using the electric vehicle again. However, existing lithium battery mounting frames 3 are mostly fastened to the housing 1 with screws. After long-term use, the screws and threaded holes are prone to stripping, wear, or corrosion, making the mounting frame 3 difficult to remove, resulting in difficulties in disassembling old batteries and inconvenience in installing new batteries. When installing a lithium battery, first insert the lithium battery into the mounting frame 3, as follows: Figure 6In the initial state shown, under the compression of spring 102, the two opposing heat dissipation surfaces 10102 of the two adjacent clamping plates 101 are in contact with each other, while the two opposing clamping surfaces 10101 are moving away from each other. At this time, the placement slot 1002 expands, and the heat dissipation slot 1003 is sealed. Therefore, when the user needs to replace the lithium battery, they only need to place the mounting frame 3 containing the lithium battery into the corresponding placement slot 1002, and then control the electric push rod 106 to press the sliding block 107 into the heat dissipation slot 1003. The rear sliding block 107 will press the clamping plate 101 towards the mounting frame 3. During this process, the spring 102 is compressed and contracts, and the placement groove 1002 continuously shrinks until the clamping plate 101 and the heat-conducting plate 103 are in contact with the surface of the mounting frame 3. During this process, the heat dissipation groove 1003 continuously expands, thereby clamping and fixing the mounting frame 3 through the two clamping plates 101, preventing the mounting frame 3 from shaking or shifting during the use of the electric vehicle, which could cause the lithium battery to shake and loosen the positive and negative terminals of the lithium battery. Movement and breakage can affect the normal use of lithium batteries and even lead to the risk of battery runaway. When users need to replace lithium batteries, they only need to open the cover plate 2 and then control all the electric push rods 106 to retract and reset through the control system. Then, the corresponding sliding block 107 is pulled out of the heat dissipation groove 1003. At this time, the sliding block 107 releases the pressure on the clamping plate 101. Under the reset force of the spring 102, the clamping plate 101 moves towards the heat dissipation groove 1003 until the two opposing heat dissipation surfaces 10102 are in contact with each other, the heat dissipation groove 1003 is sealed, the two opposing clamping surfaces 10101 move away from each other, and the placement groove 1002 expands. Then, the user can easily put his hand into the placement groove 1002 to take out the mounting frame 3 and replace the lithium battery. This solves the problem that in the existing technology, the mounting frame 3 is mostly fastened to the shell 1 with screws. After long-term use, the screws and threaded holes are prone to stripping, wear or corrosion, making it difficult to remove the mounting frame 3 and causing difficulties in disassembling old batteries and inconvenience in installing new batteries.

[0023] Furthermore, after the mounting frame 3 is clamped by the clamping plate 101, the two opposing clamping surfaces 10101 and the heat-conducting plate 103 of the two adjacent clamping plates 101 are in contact with the outer surface of the mounting frame 3. Therefore, during the use of the lithium battery, the mounting frame 3 will continuously absorb the heat of the lithium battery, and then the heat-conducting plate 103 will continuously absorb the heat of the mounting frame 3, thereby achieving initial heat dissipation of the lithium battery. At the same time, a heat dissipation groove 1003 is formed between the two opposing heat dissipation surfaces 10102. Therefore, during the use of the mounting frame 3, when the fan 10 is activated... 5. External air is drawn into the heat dissipation tank 1003 through the front air box 105 via the front channel 10701. Then, the hot air that has absorbed the heat of the heat conduction plate 103 in the heat dissipation tank 1003 is drawn out through the rear channel 10701 via the rear air box 105. Thus, a continuous and stable airflow is formed in the heat dissipation tank 1003, which efficiently removes the heat conducted by the heat conduction plate 103. At the same time, the airflow can also directly contact the lithium battery, thereby achieving active and efficient heat dissipation of the lithium battery and ensuring that the lithium battery operates within a safe temperature range.

[0024] Furthermore, considering that although the airflow formed within the heat dissipation groove 1003 can efficiently dissipate heat from the lithium battery, this also breaks the sealed protection of the battery pack. When the lithium battery catches fire due to overheating caused by circuit aging or its own quality problems, the airflow will continuously bring external air into the casing 1, providing oxygen for the combustion process and greatly increasing the risk of accidents. Therefore, when the smoke sensor 104 detects that the lithium battery in the placement groove 1002 is on fire or spontaneously combusting, the smoke sensor 104 will send a signal to the control system to control all the electric push rods 106 to retract and reset. Then, the opposing heat dissipation surfaces 10102 will fit together, and the heat-conducting plates 103 on the two adjacent clamping plates 101 will be staggered vertically, with the heat-conducting plates 103 protruding from the heat dissipation surfaces 10102 of the clamping plates 101. Therefore, the heat-conducting plates 103 on the two clamping plates 101 will insert into the corresponding gaps, thereby sealing the heat dissipation groove 1003 and thus protecting the casing. 1. The housing 1 is sealed with the placement slot 1002 to prevent external airflow from entering the housing 1. At the same time, it prevents the lithium battery from spontaneously combusting and affecting the lithium batteries in the adjacent placement slot 1002, thus avoiding further damage. After the placement slot 1002 is sealed, the control system sends a control signal to the spray valve in the corresponding nozzle 109. Then the spray valve will open and spray the dry powder stored in the fire extinguishing box 108 into the placement slot 1002 to extinguish the lithium battery. At this time, the two opposing clamping surfaces 10101 move away from each other, the placement slot 1002 expands, and a gap is generated between the mounting frame 3 and the clamping surface 10101. Therefore, the sprayed dry powder will enter the gap between the mounting frame 3 and the clamping surface 10101, and then quickly cover all the lithium batteries in the mounting frame 3, which greatly improves the fire extinguishing effect of the lithium battery. In this way, while ensuring the heat dissipation efficiency of the battery pack, the risk of fire and explosion caused by the heat dissipation structure is avoided. The shape change of the heat dissipation structure can also improve the protection effect of the battery pack.

[0025] In a preferred embodiment of the present invention, the mounting frame 3 is made of aluminum nitride ceramic.

[0026] In this embodiment, the mounting frame 3, integrally formed from aluminum nitride ceramic material, has both excellent thermal conductivity and reliable insulation properties: on the one hand, it can quickly dissipate the heat generated during battery operation, ensuring battery heat dissipation efficiency and operational stability; on the other hand, it can effectively block current conduction, avoiding the risk of battery leakage or short circuit; at the same time, its own structural strength can form a stable installation for the battery, preventing battery displacement and ensuring installation accuracy and safety of use.

[0027] In a preferred embodiment of the present invention, the heat-conducting plate 103 is made of 6063 aluminum alloy.

[0028] In this embodiment, the thermal conductivity of 6063 aluminum alloy is about 160-200 W / (m·K), and its heat dissipation efficiency can meet the heat dissipation requirements of lithium battery (the operating temperature of lithium battery needs to be controlled between 20-45℃). In addition, 6061 / 6063 aluminum alloy has low density, which will not significantly increase the overall weight of the battery pack. It also has strong corrosion resistance and high stability in long-term use.

[0029] In a preferred embodiment of the present invention, such as Figures 2-4 As shown, a number of fixing rods 1001 are fixedly connected to the housing 1, and the fixing rods 1001 are made of carbon steel; each clamping plate 101 is slidably connected to the corresponding fixing rod 1001.

[0030] In this embodiment, the fixing rod 1001 made of carbon steel can effectively improve the structural strength of the battery pack, resist deformation caused by vibration and impact, and greatly improve the service life of the battery pack.

[0031] In a preferred embodiment of the present invention, such as Figure 5 and Figure 6 As shown, each sliding block 107 has a wedge-shaped surface on the side facing the heat dissipation groove 1003.

[0032] In this embodiment, considering that the clamping plate 101 will inevitably wear out during long-term use, and that when a new lithium battery is replaced, the two clamping plates 101 cannot effectively clamp the mounting frame 3 after being squeezed by the sliding block 107, the sliding block 107 is provided with a wedge-shaped surface on the side facing the heat dissipation groove 1003. As the sliding block 107 moves into the heat dissipation groove 1003, the sliding block 107 will continuously squeeze the clamping plate 101 towards the mounting frame 3, thereby ensuring the clamping effect of the clamping plate 101 on the mounting frame 3.

[0033] In a preferred embodiment of the present invention, such as Figure 4 As shown, each fixed rod 1001 is provided with a wire groove 1004, and each wire groove 1004 is provided with several through grooves.

[0034] In this embodiment, when the user connects the lithium battery, the wires can be inserted into the corresponding wire slots 1004 through the through slots. The wire slots 1004 can then be used to classify and store the wires, preventing them from getting tangled or crossing. This makes the internal layout of the battery pack more organized, improves its aesthetics, and facilitates subsequent troubleshooting and maintenance.

[0035] In a preferred embodiment of the present invention, such as Figure 1 As shown, a handle 2001 is fixedly attached to the cover plate 2.

[0036] In this embodiment, during the process of replacing the mounting frame 3, after the user removes the cover plate 2 from the locking screws of the electric vehicle, they can hold the handle 2001 to lift the battery pack out of the electric vehicle and then remove and replace the lithium battery, making it convenient for the user to perform the replacement operation.

[0037] Example 2: Based on Example 1, as follows Figure 7 As shown, it also includes a cooling fan 201; each air box 105 has two air inlet slots 10501; each air inlet slot 10501 has a cooling fan 201 fixedly connected to it; each through slot 10701 is connected to the corresponding air inlet slot 10501.

[0038] In this embodiment, after the lithium battery spontaneously combusts and the casing 1 and each placement slot 1002 are sealed, the airflow in the bellows 105 cannot enter the casing 1 and the placement slots 1002. At this time, the two cooling fans 201 work together to make the airflow circulate in a specific flow channel inside the bellows 105. This flow channel is in close contact with the wall of the casing 1, thereby carrying away the heat of the casing 1 through the circulating airflow. Then, when the lithium battery is working normally, the two bellows 105 send the outside gas into the casing 1, making the airflow flow in the casing 1, thereby directly contacting the lithium battery to dissipate heat and improve the heat dissipation effect. When the lithium battery spontaneously combusts, the airflow circulates in the bellows 105, thereby protecting the casing 1 from heat dissipation through the bellows 105.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that variations may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A protective cylindrical lithium battery pack, comprising a housing (1); a cover plate (2) detachably connected to the housing (1), and a control system disposed inside the housing (1), the control system comprising a control circuit board, the control circuit board having an encoder integrated thereon; characterized in that, It also includes several mounting frames (3) installed inside the housing (1) for placing cylindrical lithium batteries, the mounting frames (3) being made of thermally conductive material; several placement slots (1002) are provided inside the housing (1); two clamping plates (101) are provided between every two adjacent placement slots (1002); each clamping plate (101) is provided with a clamping surface (10101) and a heat dissipation surface (10102); the clamping surface (10101) of each clamping plate (101) faces the placement slot (1002); between the two opposing heat dissipation surfaces (10102) A heat dissipation groove (1003) is formed; several springs (102) are fixed between each clamping plate (101) and the housing (1); several heat-conducting plates (103) are fixed on each clamping plate (101); the heat-conducting plates (103) on two adjacent clamping plates (101) are arranged in an alternating manner, and the heat-conducting plates (103) protrude from the heat dissipation surface (10102) of the clamping plate (101); a heat dissipation component for dissipating heat from the lithium battery is connected to the housing (1); a fire extinguishing component for extinguishing fire from the mounting frame (3) is connected inside the housing (1); The heat dissipation assembly includes a bellows (105) fixed to the housing (1); each bellows (105) has several electric push rods (106) fixed inside; each electric push rod (106) has a sliding block (107) fixed to its telescopic end; each sliding block (107) can be slidably inserted into the corresponding bellows (105); each sliding block (107) is inserted into the corresponding heat dissipation groove (1003) and contacts the corresponding clamping plate (101); each sliding block (107) has a through groove (10701); each bellows (105) is connected to the corresponding through groove (10701); each through groove (10701) is connected to the corresponding heat dissipation groove (1003).

2. The protective cylindrical lithium battery pack according to claim 1, characterized in that, The fire extinguishing assembly includes a fire extinguishing box (108) connected inside the housing (1); each fire extinguishing box (108) has several nozzles (109) fixedly connected inside, and each nozzle (109) is equipped with a spray valve; each nozzle (109) faces the corresponding placement slot (1002); each placement slot (1002) has a smoke sensor (104) fixedly connected inside, and each smoke sensor (104) is electrically connected to the spray valve inside the corresponding nozzle (109).

3. A protective cylindrical lithium battery pack according to claim 1, characterized in that, The mounting frame (3) is made of aluminum nitride ceramic.

4. A protective cylindrical lithium battery pack according to claim 1, characterized in that, The heat-conducting plate (103) is made of 6063 aluminum alloy.

5. A protective cylindrical lithium battery pack according to claim 2, characterized in that, Several fixing rods (1001) are fixedly connected to the housing (1), and the fixing rods (1001) are made of carbon steel; each clamping plate (101) is slidably connected to the corresponding fixing rod (1001).

6. A protective cylindrical lithium battery pack according to claim 1, characterized in that, Each sliding block (107) has a wedge-shaped surface on the side facing the heat dissipation groove (1003).

7. A protective cylindrical lithium battery pack according to claim 5, characterized in that, Each fixed rod (1001) is provided with a wire groove (1004) for wiring, and the side wall of the wire groove (1004) has several through grooves.

8. A protective cylindrical lithium battery pack according to claim 1, characterized in that, A handle (2001) is fixedly attached to the cover plate (2).

9. A protective cylindrical lithium battery pack according to claim 1, characterized in that, It also includes a cooling fan (201); each air box (105) has two air inlet slots (10501); each air inlet slot (10501) has a cooling fan (201) fixedly connected to it; each through slot (10701) is connected to the corresponding air inlet slot (10501).

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