Cylindrical lithium battery cover plate and battery pack

Abstract

The utility model provides a cylindrical lithium battery cover plate and a battery pack, and relates to the technical field of lithium batteries, the cylindrical lithium battery cover plate and the battery pack comprise a bearing plate, an explosion-proof valve is fixedly connected in the bearing plate, the top end of the bearing plate is detachably connected with an insulation pad, a mounting hole is formed in the insulation pad, and the mounting hole directly faces the explosion-proof valve; the explosion-proof valve is protected through the insulating pad, the explosion-proof valve is prevented from being extruded by the outside, and meanwhile, when the explosion-proof valve is opened due to overlarge pressure in the lithium battery main body, gas in the lithium battery is released through the ventilation plate.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to a cylindrical lithium battery cover and battery pack. Background Technology

[0002] Cylindrical lithium batteries, as a widely used portable energy solution, have seen rapid development since the 1990s. These batteries use lithium ions as charge carriers, which move between the positive and negative electrodes to generate current. The cylindrical design makes them cost-effective to manufacture and provides stable energy output. They are widely used in consumer electronics such as laptops and mobile phones, and their application is expanding with the growth of the electric vehicle market. Technological advancements are constantly driving improvements in energy density, charging speed, and cycle life to meet the ever-increasing energy demands.

[0003] Patent CN216436009U discloses a battery cover assembly and a cylindrical lithium battery, including a circular cover plate used to close the opening of the battery casing. The cover plate is provided with an injection hole and an explosion-proof valve. The explosion-proof valve seals the injection hole after the battery is filled with electrolyte. In use, the cover plate is welded to the end of the cylindrical battery casing. Because the cover plate is provided with an injection hole and an explosion-proof valve, and the explosion-proof valve seals the injection hole after the injection is completed, by integrating the explosion-proof valve with the injection hole, that is, using the explosion-proof valve to seal the injection hole after the injection is completed, the vacuuming during the injection process is avoided from affecting the engraving marks on the explosion-proof valve. This eliminates the problem of the explosion-proof valve automatically opening during the injection process to a certain extent. However, because the explosion-proof valve is integrated with the injection hole on the surface of the cover plate, the explosion-proof valve may be squeezed and damaged during the installation of the lithium battery pack. This may cause the explosion-proof valve to open prematurely or fail, thus creating a safety hazard.

[0004] Therefore, it is necessary to provide a new cylindrical lithium battery cover and battery pack to solve the above-mentioned technical problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, the first aspect of this utility model provides a cylindrical lithium battery cover plate, which includes: a receiving plate, an explosion-proof valve fixedly connected inside the receiving plate, an insulating pad detachably connected to the top of the receiving plate, an installation hole provided in the insulating pad, the installation hole being directly opposite the explosion-proof valve, and a vent plate rotatably connected inside the installation hole.

[0006] Preferably, a pressure block is fixedly connected to the top of the insulating pad, and multiple sealing rings are movably connected between the pressure block and the insulating pad. An insertion hole is opened in the pressure block, and a metal patch is attached to the top of the pressure block. A fixing component for fixing the metal patch is fixedly connected to one side of the top of the insulating pad.

[0007] Preferably, the fixing component includes a sleeve, a receiving post is inserted inside the sleeve, a pressure plate is detachably connected to the top of the receiving post, a plug post is fixedly connected to one end of the pressure plate, the plug post passes through a metal patch and is inserted into a plug hole, and a spring is nested outside the receiving post, one end of the spring is in contact with the top wall of the inner cavity of the sleeve.

[0008] Preferably, a lower support is fixedly connected to the bottom end of the receiving plate, and a flow collector is detachably connected to the top wall of the inner cavity of the lower support. One end of the flow collector passes through the side wall of the lower support, and an injection port is opened inside the lower support, with the injection port facing the explosion-proof valve.

[0009] Preferably, multiple terminals are inserted inside the current collector, and all of the terminals pass through the pressure block.

[0010] The first aspect of this utility model provides a battery pack, which includes a plurality of lithium battery bodies and the aforementioned cylindrical lithium battery cover plate. The cylindrical lithium battery cover plate is fixedly connected to the top of each of the plurality of lithium battery bodies. Mounting frames are nested at the top and bottom of each of the plurality of lithium battery bodies, and each pair of adjacent mounting frames is detachably connected.

[0011] Preferably, the mounting frame has sliding grooves on its adjacent sides, and the other adjacent sides of the mounting frame are fixedly connected with sliders that match the sliding grooves. The two adjacent mounting frames are detachably connected through the sliding grooves and sliders.

[0012] Preferably, a metal patch is attached to the bottom of the lithium battery body, an insertion hole is provided at the bottom of the lithium battery body, and a fixing component for fixing the metal patch is fixedly connected to one side of the bottom of the lithium battery body, with one end of the fixing component inserted into the insertion hole.

[0013] Compared with related technologies, the cylindrical lithium battery cover and battery pack provided by this utility model have the following advantages:

[0014] 1. This utility model provides a cylindrical lithium battery cover and battery pack. In specific implementation, the explosion-proof valve is protected by an insulating pad to prevent the explosion-proof valve from being squeezed by the outside. At the same time, when the explosion-proof valve opens due to excessive pressure inside the lithium battery body, the gas inside the lithium battery is released through the vent plate.

[0015] 2. The metal patches are attached to the positive and negative terminals of the lithium battery body using a pressure plate. When replacing the lithium battery body, simply lift and rotate the pressure plate. Compared to welding the metal patches to the positive and negative terminals of the lithium battery body, fixing the metal patches with the pressure plate makes replacing and repairing the lithium battery body much simpler. Attached Figure Description

[0016] Figure 1 A schematic diagram of the overall structure of the cylindrical lithium battery cover provided by this utility model;

[0017] Figure 2 An exploded structural diagram of the cylindrical lithium battery cover plate provided by this utility model;

[0018] Figure 3 A longitudinal sectional view of the cylindrical lithium battery cover plate provided by this utility model;

[0019] Figure 4 This is a schematic diagram of the overall structure of the battery pack provided by this utility model.

[0020] The following are the labels in the diagram: 1. Receiving plate; 2. Injection port; 3. Explosion-proof valve; 4. Insulating pad; 5. Mounting hole; 6. Vent plate; 7. Pressure block; 8. Sealing ring; 9. Insertion hole; 10. Metal patch; 11. Sleeve; 12. Receiving post; 13. Pressure plate; 14. Insertion post; 15. Spring; 16. Lower bracket; 17. Current collector; 18. Terminal post; 19. Lithium battery body; 20. Mounting frame; 21. Sliding groove; 22. Slider; 23. Through hole. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Please refer to the following: Figure 1 — Figure 4 ,in, Figure 1 A schematic diagram of the overall structure of the cylindrical lithium battery cover provided by this utility model; Figure 2 An exploded structural diagram of the cylindrical lithium battery cover plate provided by this utility model; Figure 3 A longitudinal sectional view of the cylindrical lithium battery cover plate provided by this utility model; Figure 4 This is a schematic diagram of the overall structure of the battery pack provided by this utility model.

[0023] In specific implementation, a cylindrical lithium battery cover and battery pack have the following structure: Figure 1 — Figure 4As shown, it includes: a lower support 16, a collector plate 17 installed inside the lower support 16, one end of the collector plate 17 passing through the side wall of the lower support 16, a receiving plate 1 welded to the upper end face of the lower support 16, an injection port 2 opened in the receiving plate 1, an explosion-proof valve 3 is installed at the injection port 2, the explosion-proof valve 3 is integrated with the injection port 2, an insulating gasket 4 is threaded to the top of the receiving plate 1, an installation hole 5 is opened in the insulating gasket 4 directly opposite the injection port 2, a vent plate 6 with a vent hole is rotatably connected in the installation hole 5, a pressure block 7 is welded to the top of the insulating gasket 4, a sealing ring 8 is inserted between the pressure block 7 and the insulating gasket 4, two pole posts 18 are inserted in the pressure block 7, two through holes 23 are opened in the pressure block 7, the insulating gasket 4, the receiving plate 1, the lower support 16 and the collector plate 17, and the two pole posts 18 are arranged according to... The through-hole 23 passes through the pressure block 7, insulating pad 4, receiving plate 1, lower bracket 16, and current collector 17. The pressure block 7 has an insertion hole 9. A metal patch 10 is attached to the top of the pressure block 7. A fixing component is also attached to the upper surface of the insulating pad 4. The fixing component includes a sleeve 11, located on one side of the pressure block 7. A receiving post 12 is nested inside the sleeve 11. A pressure plate 13 is threaded to the upper end of the receiving post 12, allowing the receiving post 12 to rotate within the sleeve 11. This rotation causes the pressure plate 13 to rotate. An insertion post 14 is integrally connected to the other end of the pressure plate 13. The size of the insertion post 14 matches the insertion hole 9. A spring 15 is nested outside the receiving post 12. The top of the spring 15 is attached to the top wall of the inner cavity of the sleeve 11, and the spring 15 applies pressure to the receiving post 12. Under the downward force, the receiving column 12 drives the insertion column 14 to pass through the metal patch 10 and insert into the insertion hole 9. At this time, the pressure plate 13 tightly adheres the metal patch 10 to the top of the pressure block 7. The cylindrical lithium battery cover is welded to the top of the lithium battery body 19. The cylindrical lithium battery cover is the positive electrode of the lithium battery body 19, and the bottom of the lithium battery body 19 is the negative electrode. The metal patch 10 is attached to the bottom of the lithium battery body 19, and a fixing component is also fixedly connected to the bottom of the lithium battery body 19. The bottom of the lithium battery body 19 also has an insertion hole 9. One end of the fixing component passes through the metal patch 10 and inserts into the insertion hole 9, thereby fixing the metal patch 10. The top and bottom of the lithium battery body 19 are both nested with mounting frames 20. The side walls of the mounting frames 20 on adjacent sides are provided with sliding grooves. 21. Slider 22 is integrally connected to the side walls of the adjacent sides of the mounting frame 20. The slider 22 of one mounting frame 20 inserts into the sliding groove 21 of another adjacent mounting frame 20, thus enabling detachable connection of multiple mounting frames 20. The positive electrodes of multiple lithium battery bodies 19 in the same row are connected in parallel via metal patches 10, and the negative electrodes of multiple lithium battery bodies 19 are also connected in parallel via metal patches 10. The positive electrodes of multiple lithium battery bodies 19 in the same row are connected in series with the negative electrodes of multiple lithium battery bodies 19 in another row via metal patches 10. When the lithium battery body 19 needs to be replaced, simply lift and rotate the pressure plate 13. At this time, the pressure plate 13 rotates around the supporting column 12 as its central axis, and the spring 15 is in a compressed state.At this point, the metal patch 10 can be detached from the lithium battery body 19, allowing the lithium battery body 19 to be replaced. After replacement, simply attach the metal patch 10 to the positive or negative terminal of the lithium battery body 19, then rotate the pressure plate 13. Under the elastic force of the spring 15, the pressure plate 13 fixes the metal patch 10 to the positive or negative terminal of the lithium battery body 19, and positions the metal patch 10 through the insertion post 14 to prevent it from sliding, thus completing the replacement of the lithium battery body 19.

[0024] The working principle of this utility model is as follows: During the manufacturing process, the lithium battery body 19 is pressurized through the injection port 2 and then injected with electrolyte. After the electrolyte is injected, the explosion-proof valve 3 is welded into the injection port 2 to seal the injection port 2. Then, the insulating pad 4 is threaded to the top of the receiving plate 1. Since the insulating pad 4 has an installation hole 5 and a vent plate 6 is rotatably connected in the installation hole 5, the explosion-proof valve 3 is prevented from being squeezed and damaged during the use of the lithium battery or the installation of the battery pack under the protection of the insulating pad 4. After the lithium battery cover is installed, the top and bottom of the lithium battery body 19 are nested in the mounting frame 20. Then, two adjacent lithium battery bodies 19 are detachably connected by the sliding groove 21 and the slider 22 of the mounting frame 20. Then, the metal patch 10 is placed on the positive or negative electrode of the lithium battery body 19. The metal patch 10 connects two adjacent lithium battery bodies 19 in parallel or series, thereby installing multiple lithium battery bodies 19 into a lithium battery pack.

[0025] The circuits and controls involved in this utility model are all existing technologies, and will not be described in detail here.

[0026] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A cylindrical lithium battery cover, characterized in that, Includes a receiving plate (1), an explosion-proof valve (3) is fixedly connected inside the receiving plate (1), an insulating pad (4) is detachably connected to the top of the receiving plate (1), an installation hole (5) is opened inside the insulating pad (4), the installation hole (5) is directly opposite the explosion-proof valve (3), and a vent plate (6) is rotatably connected inside the installation hole (5).

2. The cylindrical lithium battery cover plate according to claim 1, characterized in that, The top of the insulating pad (4) is fixedly connected to a pressure block (7), and multiple sealing rings (8) are movably connected between the pressure block (7) and the insulating pad (4). An insertion hole (9) is opened in the pressure block (7), and a metal patch (10) is attached to the top of the pressure block (7). A fixing component for fixing the metal patch (10) is fixedly connected to one side of the top of the insulating pad (4).

3. The cylindrical lithium battery cover plate according to claim 2, characterized in that, The fixing assembly includes a sleeve (11), a receiving post (12) is inserted inside the sleeve (11), a pressure plate (13) is detachably connected to the top of the receiving post (12), a plug post (14) is fixedly connected to one end of the pressure plate (13), the plug post (14) passes through the metal patch (10) and is inserted into the socket (9), and a spring (15) is nested outside the receiving post (12), one end of the spring (15) is in contact with the top wall of the inner cavity of the sleeve (11).

4. The cylindrical lithium battery cover plate according to claim 3, characterized in that, The bottom end of the receiving plate (1) is fixedly connected to a lower bracket (16). The top wall of the inner cavity of the lower bracket (16) is detachably connected to a flow collector (17). One end of the flow collector (17) passes through the side wall of the lower bracket (16). An injection port (2) is opened inside the lower bracket (16). The injection port (2) is directly opposite the explosion-proof valve (3).

5. The cylindrical lithium battery cover plate according to claim 4, characterized in that, Multiple pole posts (18) are inserted inside the current collector plate (17), and all of the multiple pole posts (18) pass through the pressure block (7).

6. A battery pack, characterized in that, It includes multiple lithium battery bodies (19) and a cylindrical lithium battery cover plate as described in any one of claims 1-5. The top of each of the multiple lithium battery bodies (19) is fixedly connected to the cylindrical lithium battery cover plate. The top and bottom of each of the multiple lithium battery bodies (19) are nested with mounting frames (20). The mounting frames (20) are detachably connected to each other.

7. The battery pack according to claim 6, characterized in that, The mounting frame (20) has sliding grooves (21) on its adjacent sides, and the other adjacent sides of the mounting frame are fixedly connected with sliders (22) that match the sliding grooves (21). The two adjacent mounting frames (20) are detachably connected through the sliding grooves (21) and the sliders (22).

8. The battery pack according to claim 7, characterized in that, The bottom end of the lithium battery body (19) is attached to a metal patch (10), and the bottom end of the lithium battery body (19) is provided with a socket (9). A fixing component for fixing the metal patch (10) is fixedly connected to one side of the bottom end of the lithium battery body (19), and one end of the fixing component is inserted into the socket (9).

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