Battery cover plate and cylindrical battery

Abstract

The utility model discloses a cylindrical battery cover plate, which relates to the field of batteries and comprises a two-way shell, a battery cell arranged in the shell, and a positive electrode cover plate and a negative electrode cover plate which are arranged at two ends of the shell. The negative electrode cover plate is composed of a first current collecting disc, a second current collecting disc and a negative electrode column, and the negative electrode column is sleeved with a sealing ring and a rubber ring from inside to outside. The battery core arranged in the shell is in direct contact with the second current collecting plate, and an acting force is applied to the second current collecting plate, so that the rubber ring and the sealing ring are deformed by the second current collecting plate; and after the rubber ring and the sealing ring deform, a counter-acting force is generated on the second flow collecting disc, so that the second flow collecting disc reaches a two-force balance position. In this way, all parts in the shell abut against one another, the purpose of limiting the battery cell is achieved, the welding area is protected, meanwhile, the proportion of the battery cell in the shell is increased, and the space utilization rate in the shell is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery field especially relates to a cylindrical battery cover plate. BACKGROUND

[0002] Battery refers to the cup, tank or other container or composite container part space containing electrolyte solution and metal electrode to produce current, can convert chemical energy into electric energy device, has the division of positive pole, negative pole. Battery as energy source, is not affected by the outside climate and temperature, stable and reliable performance, plays a very big role in various aspects of modern social life.

[0003] The patent with the patent publication No. CN220895645U discloses a cylindrical aluminum shell battery, including roll core, shell, positive cover plate assembly, negative cover plate assembly, the shell is double through opening shell, roll core is arranged in the shell, the positive cover plate assembly and the negative cover plate assembly are respectively installed to the both ends of the shell, the battery is assembled, and the positive pole is led to the negative side cover plate through the positive pole aluminum cover plate of the positive cover plate assembly and the shell, which is convenient for realizing the busbar design and welding of external module or system.

[0004] But the negative connection sheet is bent, and the gap between the negative plastic part and the negative connection sheet causes internal space waste in the above technical scheme;The bent negative connection sheet cannot limit the internal battery after connecting with the battery, and the internal battery will appear up and down shaking, tearing and welding area and other defects. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a scheme for effectively limiting the battery, and therefore provides a battery cover plate and cylindrical battery.

[0006] A battery cover plate and cylindrical battery adopt the following technical scheme:

[0007] A battery cover plate is used for installing at the end of the battery shell, and includes a positive cover plate and a negative cover plate.

[0008] The positive cover plate is provided with a positive pole at the center, and the positive pole is provided with a liquid injection pipe at the center.

[0009] The negative cover plate includes a first current collector and a second current collector concentrically arranged at the bottom of the first current collector, the second current collector is provided with a negative pole at the center, the first current collector is provided with a through hole matched with the negative pole at the center, a sealing ring is arranged between the first current collector and the second current collector, the sealing ring is sleeved on the negative pole, and a rubber ring is sleeved at the bottom edge of the sealing ring.

[0010] By adopting the above technical solution, the negative electrode cover plate and the positive electrode cover plate are respectively located at both ends of the shell. The battery cell located inside the shell abuts against the positive electrode cover plate and the negative electrode cover plate respectively. The sealing ring is sleeved on the negative electrode post, and the rubber ring is sleeved on the bottom edge of the sealing ring and tightly fits against the first current collector and the second current collector. The battery cell exerts pressure on the second current collector, causing the sealing ring and the rubber ring to deform. At the same time, the deformation of the sealing ring and the rubber ring generates a reaction force on the second current collector, pressing the battery cell tightly. In this way, the battery cell is limited. At the same time, the rubber ring contacts the inner wall of the shell, which plays a sealing role inside the battery, improves the utilization rate of the internal space, and prevents the battery cell from shaking and tearing the welding area.

[0011] Furthermore, the negative terminal includes a column connected in sequence, an annular portion that is in close contact with the second collector plate, and a protrusion embedded in the center of the second collector plate, the protrusion being flush with the bottom surface of the second collector plate.

[0012] Furthermore, the first collector plate has a first convex ring and a first inclined portion on its side.

[0013] Preferably, the rubber ring is smaller than the diameter of the first collector plate, and the second collector plate is smaller than the diameter of the rubber ring.

[0014] By adopting the above technical solution, the sealing effect of the negative electrode cover is improved and the installation difficulty is reduced.

[0015] Furthermore, the positive electrode cover plate includes a third current collector and a fourth current collector concentrically disposed at the bottom of the third current collector, and the edge of the third current collector is provided with a second convex ring and a second inclined portion.

[0016] Preferably, the diameter of the fourth collector disk is smaller than that of the third collector disk.

[0017] By adopting the above technical solution, the convex ring of the third collector plate abuts against the housing, and the second inclined part of the third collector plate is tightly attached to the inner wall of the housing to achieve a sealing effect.

[0018] Furthermore, the third collector plate is provided with an explosion-proof hole, the top surface of the explosion-proof hole is provided with an aluminum sheet, and the bottom of the explosion-proof hole is provided with an explosion-proof valve.

[0019] By adopting the above technical solution, when the internal pressure of the battery malfunctions and becomes too high, the explosion-proof hole will automatically release the pressure, preventing the battery from exploding and improving the safety of the product.

[0020] Furthermore, the positive terminal is located at the center of the fourth collector.

[0021] Furthermore, a through hole is provided at the center of the third collector plate to cooperate with the positive electrode post, and a sealing pin is provided at the through hole on the top surface of the third collector plate to cooperate with the liquid injection pipe.

[0022] By adopting the above technical solution, the liquid injection efficiency is improved and liquid leakage is avoided during liquid injection, while the overall sealing performance of the battery is improved.

[0023] A cylindrical battery includes a double-through housing and a battery cell disposed inside the housing. The battery cover is disposed at the end of the double-through housing and welded to the housing. The battery cell is connected to the positive terminal and the negative terminal of the battery cover.

[0024] By adopting the above technical solution, the rubber ring deforms and presses against the battery cell to play a limiting role, while also pressing against the inner wall of the casing, thus improving the sealing effect of the battery.

[0025] In summary, this application includes at least one of the following beneficial effects:

[0026] 1. The sealing ring and rubber ring set between the first and second current collectors press against the battery cell by deforming, which effectively limits the battery cell and improves the utilization of internal space.

[0027] 2. After the sealing ring and rubber ring deform together, they press against the inner wall of the shell, which plays a good sealing role between the negative electrode cover plate and the shell, and between the negative electrode post and the first collector plate.

[0028] 3. The diameter of the positive electrode cover and the negative electrode cover decreases from the outside to the inside of the shell, which serves as a physical seal.

[0029] 4. The first inclined part and the first convex ring cooperate to limit the negative electrode cover; the second inclined part and the second convex ring cooperate to limit the positive electrode cover, which reduces the installation difficulty and improves the installation efficiency and sealing effect. Attached Figure Description

[0030] Figure 1 This is one of the overall structural schematic diagrams of this utility model;

[0031] Figure 2 This is the second schematic diagram of the overall structure of this utility model;

[0032] Figure 3 This is a top view of the negative electrode cover plate of this utility model;

[0033] Figure 4 This is a cross-sectional view of the negative electrode cover plate at point A of this utility model;

[0034] Figure 5This is a schematic diagram of the structure of the first collector disk of this utility model;

[0035] Figure 6 This is a schematic diagram of the structure of the second collector disk of this utility model;

[0036] Figure 7 This is a cross-sectional view of the negative electrode post of this utility model;

[0037] Figure 8 This is a top view of the positive electrode cover plate of this utility model;

[0038] Figure 9 This is a cross-sectional view of the positive electrode cover plate at point B of this utility model;

[0039] Figure 10 This is a schematic diagram of the structure of the third collector plate of this utility model;

[0040] Figure 11 This is a schematic diagram of the structure of the fourth manifold of this utility model.

[0041] Reference numerals: 1. First collector plate; 11. First convex ring; 12. First inclined portion; 2. Second collector plate; 21. Rubber ring; 22. Negative electrode post; 221. Post; 222. Annular portion; 223. Protrusion; 23. Sealing ring; 3. Third collector plate; 31. Second convex ring; 32. Second inclined portion; 33. Explosion-proof hole; 34. Aluminum sheet; 35. Explosion-proof valve; 36. Sealing nail; 4. Fourth collector plate; 41. Positive electrode post; 42. Liquid injection tube; 5. Positive electrode cover plate; 6. Negative electrode cover plate; 7. Shell. Detailed Implementation

[0042] To make the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Example

[0043] refer to Figure 1 , 2 A cylindrical battery includes a double-through cylindrical casing 7, a battery cell, and a positive electrode cover plate 5 and a negative electrode cover plate 6 disposed at both ends of the casing 7.

[0044] refer to Figure 3 , 4 5, 6, The negative electrode cover plate 6 includes a first current collector 1, a second current collector 2, a rubber ring 21, a negative electrode post 22, and a sealing ring 23.

[0045] refer to Figure 6 The second collector plate 2 is equipped with a negative terminal post 22, for reference. Figure 7 The negative terminal 22 includes a column 221, an annular portion 222, and a protrusion 223 connected in sequence, combined with Figure 4 , 6The protrusion 223 of the negative electrode post 22 is flush with the bottom of the second collector plate 2, the sealing ring 23 is fitted on the annular part 222 of the negative electrode post 22, and the rubber ring 21 is fitted on the bottom edge of the sealing ring 23; the radii of the first collector plate 1, the rubber ring 21, and the second collector plate 2 decrease in sequence.

[0046] Combination Figure 5 , 6 The first collector plate 1 has a through hole at its center, and the through hole has the same maximum diameter as the negative electrode post 22. The top surface of the first collector plate 1 is provided with an aluminum ring and an anti-slip ring from the inside to the outside. The bottom surface of the first collector plate 1 is provided with a first mounting groove. The side surface of the first collector plate 1 is provided with a first convex ring 11 and a first inclined part 12.

[0047] Further reference Figure 4 , 5 6. When installing the first collector plate 1 and the second collector plate 2, first embed the negative electrode post 22 into the second collector plate 2, then put the sealing ring 23 on the negative electrode post 22, and put the rubber ring 21 on the bottom edge of the sealing ring 23, and make it close to the second collector plate 2. The rubber ring 21 and the second collector plate 2 cooperate to cover the annular part 222. The first collector plate 1 is put on the negative electrode post 22 through the central through hole, the aluminum ring is put on the top surface of the first collector plate 1 on the negative electrode post 22, and the anti-slip ring is put on the top surface of the first collector plate 1 on the aluminum ring.

[0048] refer to Figures 8-11 The positive electrode cover plate 5 includes the third collector plate 3 and the fourth collector plate 4.

[0049] Further reference Figure 9 The diameter of the fourth collector plate 4 is smaller than the diameter of the third collector plate 3.

[0050] refer to Figure 9 , 10 The third collector plate 3 has a through hole and an explosion-proof hole 33 in the center. An aluminum sheet 34 is provided at the explosion-proof hole 33 on the top surface of the third collector plate, and an explosion-proof valve 35 is provided at the explosion-proof hole 33 on the bottom surface of the third collector plate 3.

[0051] Further reference Figure 9 The third collector plate 3 also includes a sealing nail 36 located at the through hole on the top surface of the third collector plate and a second convex ring 31 located on the side of the third collector plate 3 and having a second inclined portion 32.

[0052] refer to Figure 9 , 11 The fourth collector plate 4 has a positive electrode post 41 and an injection pipe 42 located at the center of the positive electrode post 41.

[0053] Further reference Figures 9-11The top of the explosion-proof hole 33 on the third collector plate 3 is welded to the aluminum sheet 34, and the bottom is welded to the explosion-proof valve 35. The third collector plate 3 is connected to the positive terminal 41 of the fourth collector plate 4 through the through hole and then abuts against each other.

[0054] Combination Figure 1 , 2 4.9. First, the battery cell is connected to the positive terminal 41 of the positive electrode cover plate 5. Then, the housing 7 is fitted over the battery cell and abuts against the positive electrode cover plate 5. When the positive electrode cover plate 5 is welded to one end of the housing 7, the housing 7 abuts against the second convex ring 31 on the third current collector 3; the second inclined part 32 is tightly attached to the inner wall of the housing 7. Then, the battery cell is connected to the negative terminal 22 of the negative electrode cover plate 6. Finally, the negative electrode cover plate 6 is installed on the other end of the housing 7 and pressure is applied to make the various parts of the negative electrode cover plate 6 clamp together for welding. After the above steps are completed, the sealing ring 23 and the rubber ring 21 deform under the pressure of the battery cell and their edges abut against the inner wall of the housing 7. The second current collector 2 is located inside the housing 7. When the positive electrode cover plate 5 is welded to the housing 7, the housing 7 abuts against the second convex ring 31 on the third current collector 3 and is tightly attached to the inner wall of the housing 7 and the second inclined part 32.

[0055] After the above steps are completed, liquid is injected into the battery through the injection tube 42 in the center of the positive terminal post 41. After the battery is filled without air bubbles, the sealing nail 36 is installed at the through hole on the top surface of the third collector plate 3 and welded.

[0056] It should be noted that:

[0057] 1. The top surface of the cover plate specified in this embodiment is the surface facing the outside of the housing 7 after the cover plate and housing 7 are installed. For example, the surface on which the second rubber ring 21 is set in the first collector plate 1 in the figure; for example, the surface on which the aluminum sheet 34 is set in the third collector plate 3 in the figure.

[0058] 2. In this embodiment, the battery cell is not directly shown in the attached drawings. The battery cell is located inside the housing 7 and its two ends are connected to the positive terminal 41 of the positive terminal cover 5 and the negative terminal 22 of the negative terminal cover 6, respectively.

[0059] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A battery cover plate for mounting at the end of a battery casing, characterized in that: This includes a positive electrode cover and a negative electrode cover, which are respectively connected to both ends of the battery cell; A positive electrode post is provided at the center of the positive electrode cover plate, and a liquid injection pipe is provided at the center of the positive electrode post; The negative electrode cover plate includes a first collector plate and a second collector plate concentrically disposed at the bottom of the first collector plate. A negative electrode post is disposed at the center of the second collector plate. A through hole that mates with the negative electrode post is disposed at the center of the first collector plate. A sealing ring is disposed between the first collector plate and the second collector plate. The sealing ring is sleeved on the negative electrode post. A rubber ring is sleeved on the bottom edge of the sealing ring.

2. A battery cover according to claim 1, characterized in that: The negative terminal includes a column connected in sequence, an annular portion that is in close contact with the second collector plate, and a protrusion embedded in the center of the second collector plate. The protrusion is flush with the bottom surface of the second collector plate.

3. A battery cover according to claim 2, characterized in that: The first collector plate has a first convex ring and a first inclined portion on its side.

4. A battery cover according to claim 3, characterized in that: The diameter of the rubber ring is smaller than that of the first collector plate, and the diameter of the second collector plate is smaller than that of the rubber ring.

5. A battery cover according to claim 1, characterized in that: The positive electrode cover plate includes a third current collector and a fourth current collector concentrically arranged at the bottom of the third current collector. The edge of the third current collector is provided with a second convex ring and a second inclined portion.

6. A battery cover according to claim 5, characterized in that: The third collector plate is provided with an explosion-proof hole, the top surface of the explosion-proof hole is provided with an aluminum sheet, and the bottom of the explosion-proof hole is provided with an explosion-proof valve.

7. A battery cover according to claim 5, characterized in that: The positive terminal is located at the center of the fourth collector.

8. A battery cover according to claim 7, characterized in that: The third collector plate has a through hole at its center that mates with the positive electrode post, and a sealing pin is provided at the through hole on the top surface of the third collector plate that mates with the injection pipe.

9. A cylindrical battery, comprising a double-through casing and a battery cell disposed inside the casing, characterized in that: The battery cover plate includes any one of claims 1-8, wherein the battery cover plate is disposed at the end of the double-through housing and is welded to the housing respectively, and any one of the battery cells is connected to the positive terminal and the negative terminal of the battery cover plate respectively.

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