A battery cover plate

Abstract

The utility model discloses a battery cover plate relates to the field of battery shell, including the top cover, positioning disc, current collection disc and pole that set gradually, wherein the top cover is equipped with positioning mechanism between positioning disc, and positioning mechanism includes the positioning groove of top cover bottom surface and is equipped with the positioning ring of positioning disc top, and the positioning ring is in contact with the inner side wall of positioning groove in positioning groove, and the side that positioning ring is away from inner side wall still is equipped with the slope. Before welding to positioning disc and top cover, through the slope to top cover and positioning disc are guided respectively and cooperate, and positioning ring is in contact with the inner side wall of positioning groove in positioning groove simultaneously, has guaranteed that top cover and positioning disc will not produce the displacement in the radial direction in the cooperation process, has guaranteed the accuracy of positioning, has made the welding process easy to observe also simultaneously, has improved the precision and quality of welding effectively.

Description

Technical Field

[0001] This utility model relates to the field of battery casings, specifically to a battery cover. Background Technology

[0002] A battery is a device that converts chemical energy into electrical energy. It consists of a cup, tank, or other container or composite container filled with an electrolyte solution and metal electrodes to generate an electric current. Using batteries as an energy source provides stable voltage, stable current, and a stable power supply over a long period, thus playing a significant role in various aspects of modern life.

[0003] A battery typically consists of a battery casing, inside which are battery cells. A cover plate is located at the opening of the casing, and a current collector plate is located inside the battery. The current collector plate is welded to the battery cells, the cover plate is welded to the current collector plate, and the edge of the cover plate is welded to the battery casing. Traditional connection methods are mainly divided into flexible connections and rigid connections. Existing flexible connection solutions, such as the Chinese utility model patent with patent publication number CN 220895645U, pre-assemble the current collector plate and cover plate. However, this solution results in wasted space after the current collector plate is welded. Rigid connection solutions, such as the Chinese invention application with patent publication number CN119651076 A, separate the current collector plate and cover plate. After the current collector plate is welded, it is then welded to the terminals through the top and bottom. However, this method makes the welding unobservable and prone to incomplete welding problems.

[0004] Therefore, how to improve the structure of the battery cover so as not to waste the internal space of the battery, while making it easier to observe the solder joints during the welding process and avoid poor soldering, is an urgent problem to be solved. Utility Model Content

[0005] The technical problem to be solved by this utility model is to make reasonable use of the internal space of the battery while making the welding process observable. Therefore, a battery cover plate is provided.

[0006] A battery cover, employing the following technical solution:

[0007] A battery cover includes a top cover, a positioning plate, and a current collector arranged in sequence. The current collector has an electrode post. The top cover and the positioning plate are respectively provided with a first through hole and a second through hole for fitting onto the electrode post. A positioning mechanism is provided between the top cover and the positioning plate. The positioning mechanism includes a positioning groove and a positioning ring that cooperate with each other. The positioning groove and the positioning ring abut against the inner wall of the positioning groove.

[0008] By adopting the above technical solution, during the welding process between the top cover and the positioning plate, the positioning groove and positioning ring that cooperate with each other play a positioning role, which reduces the welding difficulty and makes the welding process easy to observe, ensuring the convenience of human intervention when problems occur during the welding process; the abutment between the positioning ring and the inner wall of the positioning groove ensures the stability and reliability of the positioning, effectively avoiding the possibility of relative displacement between the positioning plate and the top cover during the welding process.

[0009] Furthermore, the width of the positioning ring is not greater than the width of the positioning groove, and the side of the positioning ring that does not abut against the inner wall of the positioning groove is provided with a slope.

[0010] The ramp plays a guiding role during the installation of the positioning plate and cover plate, ensuring that the positioning plate and cover plate are installed in place.

[0011] Furthermore, a sealing ring is fitted on the pole post, the sealing ring including at least one ring portion and a protrusion provided on the top of the ring portion, the protrusion being interference-fitted with the wall of the first through hole in the pole post and the top cover respectively.

[0012] The protrusion of the sealing ring is interference-fitted with the wall of the first through hole and the pole, respectively, so that the relative position of the pole and the cover plate is fixed, which facilitates subsequent installation.

[0013] Furthermore, the outer diameter of the ring portion is not greater than the diameter of the second through hole.

[0014] The second through hole can accommodate the solder used in the battery cover welding process, improving the utilization of space inside the battery.

[0015] Furthermore, the battery cover is equipped with an explosion-proof mechanism and a liquid injection mechanism.

[0016] Furthermore, the liquid injection mechanism includes a liquid injection hole on the top cover, a first cavity shell at the bottom of the liquid injection hole, and a second cavity shell on the positioning plate. The first cavity shell is provided with a plug, and the bottom of the first cavity shell is provided with a first liquid hole corresponding to the liquid injection hole. The bottom of the second cavity shell is provided with a second liquid hole corresponding to the first liquid hole.

[0017] The electrolyte injection hole is set separately, which can prevent electrolyte residue near the electrode solder joint during the injection process, thus avoiding corrosion of the solder joint.

[0018] To prevent the plunger from coming out, preferably, the diameter of the injection hole is smaller than the diameter of the first cavity.

[0019] To avoid electrolyte residue on the top and bottom surfaces of the plug during the injection process, especially the electrolyte on the bottom surface inside the battery which is difficult to clean in time, it is preferable that the diameter of the second liquid hole is smaller than the diameter of the first liquid hole, so that the electrolyte flows back into the battery under the action of gravity along the steps formed by the thickness of the first and second liquid holes.

[0020] Furthermore, the first cavity shell is disposed inside the second cavity shell, and the diameter of the second liquid hole is smaller than that of the first liquid hole.

[0021] The heat generated during battery use causes the liquid volume to expand. The second chamber shell has a larger volume than the first chamber shell, which can hold a certain amount of electrolyte and reduce the risk of electrolyte leakage.

[0022] Furthermore, the plunger is interference-fitted with the inner wall of the first cavity shell.

[0023] The plunger is interference-fitted with the first chamber shell so that it has the ability to self-seal when the injection nozzle pierces the plunger during the injection process.

[0024] Since heat is inevitably generated during battery use, the explosion-proof mechanism preferably includes an explosion-proof hole on the top cover, an explosion-proof aluminum sheet at the bottom of the explosion-proof hole, and an explosion-proof cavity that cooperates with the explosion-proof aluminum sheet, so as to prevent the explosion-proof aluminum film from breaking due to insufficient internal space and excessive pressure when the battery is used normally.

[0025] To prevent the electrolyte from expanding due to heat during battery use and to ensure timely breach of the explosion-proof valve in case of malfunction, preferably, the outer edge of the positioning plate and the through hole are welded to the cover plate, ensuring that the battery can communicate with the outside world only through the injection hole and the explosion-proof hole.

[0026] Furthermore, an aluminum block is provided at the top of the pole post, and a sealing ring that mates with the bottom of the aluminum block is provided at the bottom of the aluminum block.

[0027] The protrusion of the sealing ring is interference-fitted with the hole wall of the first through hole and the terminal post, which fixes the relative position of the terminal post and the cover plate. The aluminum block on the top of the terminal post is riveted to the terminal post and cooperates with the sealing ring, which can effectively limit the displacement of the terminal post from the cover plate and improve the stability of the terminal post. Fixing the relative position of the terminal post and the cover plate facilitates the subsequent welding of the battery cover plate to the battery casing.

[0028] To facilitate positioning of the battery cover plate during welding to the battery casing after installation, the top cover edge is further provided with a recessed portion.

[0029] In summary, this application includes at least the following beneficial effects:

[0030] 1. A limiting mechanism is provided between the top cover and the positioning plate to facilitate positioning during welding at the outer contour of the positioning plate and the second through hole. The limiting mechanism includes a positioning groove and a positioning ring. The inner groove wall of the positioning ring abuts against the groove wall of the positioning groove near the pole post to improve the sealing performance of the welding between the positioning plate through hole and the top cover.

[0031] 2. The plug of the liquid injection mechanism is interference-fitted with the first cavity shell so that it has the ability to self-seal when the liquid injection nozzle pierces the plug during the liquid injection process, improving the convenience of the liquid injection process. At the same time, the separately set liquid injection hole can avoid electrolyte residue near the electrode solder joint during the liquid injection process, which can lead to corrosion of the solder joint. In order to effectively avoid excessive contact between the plug and the electrolyte, which can lead to aging and reduced sealing performance, the diameter of the second liquid hole is smaller than the diameter of the first liquid hole, so that the electrolyte flows back into the battery along the step formed by the thickness of the first liquid hole and the second liquid hole under the action of gravity.

[0032] 3. The heat generated during battery use will cause the liquid volume to expand. The second chamber shell has a larger volume than the first chamber shell and can hold a certain amount of electrolyte, reducing the risk of electrolyte leakage. The explosion-proof mechanism includes an explosion-proof chamber that can hold the electrolyte that expands during normal battery use, preventing the explosion-proof aluminum film from rupturing due to insufficient internal space and excessive pressure caused by the battery overheating during normal use. Attached Figure Description

[0033] Figure 1 A schematic cross-sectional view of a battery cover plate according to an embodiment of this utility model;

[0034] Figure 2 A schematic cross-sectional view of a battery cover plate according to an embodiment of this utility model;

[0035] Figure 3 For the present utility model Figure 2 Detailed structural diagram of point A in the middle.

[0036] Figure label:

[0037] 1. Top cover; 11. Positioning groove; 12. Inner groove wall; 13. First through hole; 14. Sealing ring; 15. Protrusion; 16. Ring; 17. Recessed part; 2. Positioning plate; 21. Positioning ring; 22. Slope; 23. Second through hole; 3. Collector plate; 31. Mounting base; 4. Pole post; 41. Base; 42. Aluminum block; 5. Liquid injection mechanism; 51. Liquid injection hole; 52. First cavity shell; 53. First liquid hole; 54. Plug; 55. Second cavity shell; 56. Second liquid hole; 6. Explosion-proof mechanism; 61. Explosion-proof hole; 62. Explosion-proof aluminum membrane; 63. Explosion-proof cavity; 64. Pressure relief hole; 7. Sealing ring. Detailed Implementation

[0038] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0039] Example 1

[0040] refer to Figure 1 A battery cover includes a top cover 1, a positioning plate 2, and a current collector 3 arranged sequentially. The top cover 1 has recessed portions 17 on both sides that cooperate with the battery housing. The current collector 3 has mounting seats 31 that cooperate with the positioning plate 2 and the terminal post 4 respectively. The top cover 1 and the positioning plate 2 are respectively provided with a first through hole 13 and a second through hole 23 so that the top cover 1 and the positioning plate 2 are sleeved on the terminal post 4.

[0041] Further reference Figure 1 A sealing ring 14 is also fitted on the pole post 4. The sealing ring 14 includes a ring portion 16 and a protrusion 15 on the ring portion 16. The protrusion 15 is press-fitted with the wall of the first through hole 13 and the pole post 4, respectively, so as to ensure the sealing of the connection between the pole post 4 and the top cover 1 and restrict the relative displacement between the pole post 4 and the top cover 1. The ring portion 16 of the sealing ring 14 is located in the second through hole 23, and the outer diameter of the ring portion 16 is not greater than the diameter of the second through hole 23.

[0042] refer to Figure 2 , 3 A positioning mechanism is provided between the top cover 1 and the positioning disk 2. The positioning mechanism includes a positioning groove 11 and a positioning ring 21. It should be noted that the positions of the positioning groove 11 and the positioning ring 21 are arbitrary. That is, it is only necessary to set the positioning groove 11 and the positioning ring 21 that cooperate with each other between the positioning disk 2 and the top cover 1 to achieve the positioning effect. In this embodiment, the positioning ring 21 is set on the top surface of the positioning disk 2 and the positioning groove 11 is set on the bottom of the top cover 1 for description.

[0043] Refer again Figure 2 and combined Figure 3 The positioning ring 21 abuts against the inner groove wall 12 of the positioning groove 11, for further reference. Figure 3 The width of the positioning ring 21 is less than the thickness of the positioning groove 11. The first side of the positioning ring 21 away from the inner groove wall 12 is provided with a ramp 22. The ramp 22 plays a guiding role in the physical cooperation between the top cover 1 and the positioning plate 2.

[0044] Refer again Figure 2 The battery cover is also equipped with an explosion-proof mechanism 6 and a liquid injection mechanism 5.

[0045] The injection mechanism 5 includes an injection hole 51 located on the top cover 1, a first cavity shell 52 located at the bottom of the injection hole 51, and a second cavity shell 55 for accommodating the first cavity shell 52. The bottom of the first cavity shell 52 has a first liquid hole 53, and the bottom of the second cavity shell 55 has a second liquid hole 56. A plug 54, which is interference-fitted with the inner wall of the first cavity shell 52, is also provided inside the first cavity shell 52. To prevent the plug 54 from dislodging from the first cavity shell 52, the diameters of the injection hole 51 and the first liquid hole 53 are not greater than the inner diameter of the first cavity shell 52. During the liquidation process, electrolyte residue will remain on the top and bottom surfaces of the plug 54, especially on the bottom surface inside the battery, which is difficult to clean in time. Therefore, the diameter of the second liquid hole 56 is smaller than that of the first liquid hole 53, so that the electrolyte flows back into the battery under the action of gravity along the steps formed by the thickness of the first liquid hole 53 and the second liquid hole 56. The heat generated during battery use will cause the liquid volume to expand. The volume of the second cavity shell 55 is larger than that of the first cavity shell 52, which can hold a certain amount of electrolyte and reduce the risk of electrolyte leakage.

[0046] The explosion-proof mechanism 6 includes an explosion-proof hole 61 on the top cover 1, an explosion-proof aluminum membrane 62 at the bottom of the explosion-proof hole 61, and an explosion-proof cavity 63 on the positioning plate 2 corresponding to the explosion-proof aluminum membrane 62. The bottom of the explosion-proof cavity 63 is provided with a pressure relief hole 64.

[0047] Refer again Figure 2 The pole post 4 includes a base 41 that mates with the mounting seat 31 of the positioning plate 2. The top of the pole post 4 is also provided with an aluminum block 42 that is riveted to the pole post 4. A sealing ring 7 is provided between the aluminum block 42 and the top cover 1.

[0048] Now combined with the appendix Figure 1-3 The assembly and usage status of the battery cover in this embodiment are described below:

[0049] Reference Appendix Figure 1 Take the pole post 4 and the collector plate 3, install the base 41 of the pole post 4 into the mounting seat 31 of the collector plate 3, and weld the pole post 4 at the same time. At this time, the welding process can be observed without obstruction. At this time, the installation of the pole post 4 and the collector plate 3 is completed.

[0050] refer to Figure 2 Take the first cavity shell 52, insert the plug 54 into the first cavity shell 52, and weld the first cavity shell 52 to the bottom of the injection hole 51 on the top cover 1 so that the plug 54 is installed inside the first cavity shell 52 to prevent it from falling out; take the explosion-proof aluminum film 62 and weld it to the bottom of the explosion-proof hole 61 of the top cover 1. At this time, the processing of the top cover 1 is completed.

[0051] Refer again Figure 2 and combined Figure 3Take the positioning plate 2, and use the ramp 22 of the positioning ring 21 to match the positioning groove 11, and make the positioning ring 21 abut against the inner groove wall 12 of the positioning groove 11 to ensure the accuracy of positioning. At the same time, ensure that the first cavity shell 52 is located inside the second cavity shell 55. At this time, weld the second through hole 23 and the outer edge of the positioning plate 2 to complete the matching and connection between the top cover 1 and the positioning plate 2.

[0052] Combination Figure 1 , 2 A sealing ring 14 is placed inside the second through hole 23. The protrusion 15 of the sealing ring 14 is located inside the first through hole 13, and the ring 16 is located inside the second through hole 23. The protrusion 15 is press-fitted with the pole post 4 and the hole wall of the first through hole 13 to ensure sealing. At the same time, after the positioning plate 2 and the top cover 1 are installed in place, the sealing ring 7 is fitted on the pole post 4, and then the aluminum block 42 is riveted to the pole post 4 to achieve overall fixation. Thus, the installation of the battery cover is completed.

[0053] The next step is to weld the battery cell to the current collector 3, and then weld the recessed parts 17 on both sides of the top cover 1 to the battery casing to complete the entire welding process. This will not be described in detail here.

[0054] refer to Figure 2 During the injection process, the injection tool punctures the plug 54 through the injection hole 51 to inject the electrolyte. Since the plug 54 is interference-fitted with the inner wall of the first cavity shell 52, the injection tool has the ability to self-seal when it is inserted and removed, and can automatically seal after the injection tool is pulled out to prevent leakage. During use, the explosion-proof cavity 63 can accommodate the electrolyte that expands due to heat during normal use of the battery, and prevent the explosion-proof aluminum film 62 from rupturing due to insufficient internal space and excessive pressure when the battery is heated during normal use.

[0055] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A battery cover plate comprising a top cover (1), a positioning disc (2) and a current collecting disc (3) arranged in sequence, a pole (4) being arranged on the current collecting disc (3), and first through holes (13) and second through holes (23) being arranged on the top cover (1) and the positioning disc (2) respectively for sleeving the pole (4), characterized in that, A positioning mechanism is provided between the top cover (1) and the positioning plate (2). The positioning mechanism includes a positioning groove (11) and a positioning ring (21) that cooperate with each other. The positioning groove (11) and the positioning ring (21) abut against the inner wall (12) of the positioning groove (11).

2. The battery cover plate of claim 1, wherein The width of the positioning ring (21) is not greater than the width of the positioning groove (11), and the side of the positioning ring (21) that does not abut against the inner wall of the positioning groove (11) is provided with a ramp (22).

3. The battery cover plate of claim 1, wherein A sealing ring (14) is fitted on the pole post (4). The sealing ring (14) includes at least one ring portion (16) and a protrusion (15) on the top of the ring portion (16). The protrusion (15) is interference-fitted with the wall of the first through hole (13) in the pole post (4) and the top cover (1).

4. The battery cover plate of claim 3, wherein, The outer diameter of the ring (16) is not greater than the diameter of the second through hole (23).

5. The battery cover plate of any one of claims 2, 4, wherein, The battery cover is provided with an explosion-proof mechanism (6) and a liquid injection mechanism (5).

6. A battery cover plate as defined in claim 5, wherein The liquid injection mechanism (5) includes a liquid injection hole (51) on the top cover (1), a first cavity shell (52) at the bottom of the liquid injection hole (51), and a second cavity shell (55) on the positioning plate (2). A plug (54) is provided inside the first cavity shell (52). A first liquid hole (53) corresponding to the liquid injection hole (51) is provided at the bottom of the first cavity shell (52). A second liquid hole (56) corresponding to the first liquid hole (53) is provided at the bottom of the second cavity shell (55).

7. A battery cover according to claim 6, characterized in that, The first cavity shell (52) is disposed inside the second cavity shell (55), and the diameter of the second liquid hole (56) is smaller than that of the first liquid hole (53).

8. A battery cover according to claim 6, characterized in that, The plunger (54) is interference-fitted with the inner wall of the first cavity shell (52).

9. The battery cover according to any one of claims 2, 4, 7, and 8, characterized in that, The top of the pole post (4) is provided with an aluminum block (42), and the bottom of the aluminum block (42) is provided with a sealing ring (7) that matches the bottom of the aluminum block (42).

10. A battery cover according to claim 1, characterized in that, The top cover (1) has a recessed portion (17) at its edge.

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