A cover plate assembly with an I-beam post and a battery

Abstract

The utility model relates to battery technical field discloses a cover plate subassembly and battery with earth character shape pole post. The cover plate subassembly includes end cover and pole post, is equipped with the mounting hole of through -going on end cover, and pole post includes the flange portion of protruding post and the connection in protruding post bottom end, protruding post is extended to the top of end cover and is equipped with snap ring with the upper end part of end cover of protruding post is located, and the top surface and bottom surface of end cover are equipped with insulating sealant layer respectively around mounting hole, and snap ring and flange portion are sealed and connected with the top surface and bottom surface of end cover through insulating sealant layer respectively, and wherein, snap ring and protruding post between adopt laser welding fixed. Under the structure, the interlayer structure of " earth " character is formed between entire pole post structure and end cover, improves the connection firmness and stability between both, effectively prevented the leakage problem of electrolyte, and strengthened the overcurrent stability of pole post.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a cover plate assembly with a T-shaped terminal post and a battery. Background Technology

[0002] Lithium batteries are a type of battery with high capacity, long cycle life, and a wide operating temperature range. With the development of the new energy industry, higher requirements have been placed on the energy density, cycle life, safety, and reliability of lithium batteries.

[0003] In existing technologies, the terminals and cover plate assemblies of lithium batteries are mostly sealed and fixed by riveting. That is, the terminal is fixed to the cover plate by compressing the sealing ring. However, there is a certain probability of loose riveting during the riveting process, which will cause the terminal and the cover plate to wobble. The connection between the two is not firm, which poses a risk of electrolyte leakage and affects the current carrying capacity of the terminal.

[0004] Therefore, there is an urgent need for a cover plate assembly and battery with a T-shaped terminal post to solve the above problems. Utility Model Content

[0005] Based on the above, the purpose of this utility model is to provide a cover plate assembly and battery with a T-shaped electrode post, so as to solve the problems of insufficient stability of the riveting structure between the electrode post and the cover plate in the prior art, which leads to electrolyte leakage and poor overcurrent performance of the electrode post.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] This utility model provides a cover plate assembly with a T-shaped pole, comprising:

[0008] End cap, wherein the end cap is provided with a through mounting hole;

[0009] The pole includes a protruding post and a flange connected to the bottom end of the protruding post. The protruding post extends through the mounting hole to the top of the end cap. A retaining ring is fitted on the upper part of the protruding post located on the end cap.

[0010] The top and bottom surfaces of the end cap are respectively provided with insulating sealant layers around the mounting holes, and the retaining ring and flange are respectively sealed to the top and bottom surfaces of the end cap through the insulating sealant layers;

[0011] The retaining ring and the protruding post are fixed together by laser welding.

[0012] As an optional technical solution for a cover plate assembly with a T-shaped pole, the upper end face of the end cap is provided with a recessed platform around the mounting hole, the insulating sealant layer is provided on the recessed platform, and the bottom outer circumferential edge of the retaining ring is engaged with the inner wall of the recessed platform.

[0013] As an optional technical solution for a cover plate assembly with a T-shaped pole, the bottom surface of the end cap is provided with a recessed platform around the mounting hole, the insulating sealant layer is provided on the recessed platform, and the upper part of the flange is placed inside the recessed platform.

[0014] As an optional technical solution for a cover plate assembly with a T-shaped pole, an isolation plate is installed below the end cover, and the isolation plate has a through-hole for venting. The isolation plate is snapped onto the flange through the venting hole.

[0015] As an optional technical solution for a cover plate assembly with a T-shaped pole, the end cap and the isolation plate are provided with a first through hole and a second through hole on the same axis. An explosion-proof valve is installed on the second through hole, and a protective plate is installed on the first through hole. The protective plate is provided with a pressure relief hole.

[0016] As an optional technical solution for a cover plate assembly with a T-shaped pole, the end cap and the isolation plate are respectively provided with a coaxial upper liquid injection hole and a lower liquid injection hole, and a sealing pin is installed on the upper liquid injection hole.

[0017] As an optional technical solution for a cover plate assembly with a T-shaped pole, the inner wall of the upper injection hole and the outer circumference of the sealing pin are respectively conical, and the bottom of the sealing pin is provided with a cavity.

[0018] As an optional technical solution for a cover plate assembly with a T-shaped pole, the bottom edge of the end cap is provided with a step, and the diameter of the isolation plate is smaller than the diameter of the end cap.

[0019] As an optional technical solution for a cover plate assembly with a T-shaped pole, a busbar is connected to the bottom end of the flange.

[0020] On the other hand, the present invention also provides a battery, including a battery casing, a battery cell, and a cover plate assembly with a T-shaped terminal as described above. The cover plate assembly with the T-shaped terminal is encapsulated in the opening of the battery casing and forms a receiving cavity, and the battery cell is disposed in the receiving cavity.

[0021] The beneficial effects of this utility model are as follows:

[0022] On the one hand, the present utility model provides a cover plate assembly with a soil-shaped pole column. The cover plate assembly includes an end cover and a pole column. The end cover is provided with a through mounting hole; the pole column includes a protruding column and a flange portion connected to the bottom end of the protruding column. The protruding column passes through the mounting hole and extends above the end cover. A snap ring is sleeved on the upper end portion of the protruding column located on the end cover; insulating sealant layers are respectively provided around the mounting hole on the top surface and the bottom surface of the end cover. The snap ring and the flange portion are hermetically connected to the top surface and the bottom surface of the end cover respectively through the insulating sealant layers; wherein, the snap ring and the protruding column are fixed by laser welding.

[0023] In this structure, the flange portion is fixed to the bottom surface of the end cover through the insulating sealant layer. The top end of the protruding column passes through the mounting hole and extends above the end cover as an external electrode contact. A snap ring is sleeved on the upper end position of the protruding column located on the end cover. The snap ring and the end cover are hermetically and fixedly connected through the insulating sealant layer. Therefore, a "soil"-shaped sandwich structure is formed between the entire pole column structure and the end cover, improving the connection firmness and stability between the two, and effectively preventing the leakage problem of the electrolyte; on the other hand, laser welding is used between the snap ring and the protruding column. Therefore, the end face of the snap ring can also be used as an external electrode contact, increasing the current-carrying capacity of the pole column.

[0024] On the other hand, the present utility model also provides a battery. The battery includes a battery housing, an electric core, and a cover plate assembly with a soil-shaped pole column. The cover plate assembly with a soil-shaped pole column is encapsulated in the open mouth of the battery housing to form a containing cavity, and the electric core is arranged in the containing cavity. The connection between the pole column and the end cover on this battery is highly stable, effectively preventing the risk of electrolyte leakage and improving the use safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the cover plate assembly with a soil-shaped pole column in Embodiment 1 of the present utility model;

[0026] Figure 2 It is an exploded view of the cover plate assembly with a soil-shaped pole column in Embodiment 1 of the present utility model;

[0027] Figure 3 It is a cross-sectional view of the cover plate assembly with a soil-shaped pole column in Embodiment 1 of the present utility model;

[0028] Figure 4 It is a schematic diagram of the structure of the pole column in Embodiment 1 of the present utility model;

[0029] Figure 5 It is a bottom view of the end cover in Embodiment 1 of the present utility model;

[0030] Figure 6 It is a bottom view of the sealing nail in Embodiment 1 of the present utility model;

[0031] Figure 7 This is a schematic diagram of the overall structure of the battery in Embodiment 2 of this utility model.

[0032] In the picture:

[0033] 1. End cap; 10. Mounting hole; 11. Upper recessed platform; 12. Lower recessed platform; 13. First through hole; 131. Protective plate; 132. Pressure relief hole; 14. Upper injection hole; 15. Sealing pin; 151. Cavity; 16. Step;

[0034] 2. Pole post; 20. Raised post; 21. Flange; 22. Snap ring; 23. Insulating sealant layer;

[0035] 3. Isolation plate; 30. Void hole; 31. Second through hole; 32. Explosion-proof valve; 33. Injection hole; 34. Manifold;

[0036] 4. Battery casing. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0038] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0041] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. Furthermore, the terms "first" and "second" are used merely for descriptive distinction and have no specific meaning.

[0042] Example 1

[0043] like Figure 1-6 As shown, this utility model provides a cover plate assembly with a T-shaped pole. The cover plate assembly includes an end cap 1 with a through mounting hole 10; a pole 2 including a protruding post 20 and a flange 21 connected to the bottom end of the protruding post 20. The protruding post 20 extends through the mounting hole 10 to the top of the end cap 1, and a retaining ring 22 is fitted onto the upper part of the protruding post 20 at the end cap 1; an insulating sealant layer 23 is provided around the mounting hole 10 on the top and bottom surfaces of the end cap 1, respectively. The retaining ring 22 and the flange 21 are sealed to the top and bottom surfaces of the end cap 1 through the insulating sealant layer 23, respectively; wherein, the retaining ring 22 and the protruding post 20 are fixed by laser welding.

[0044] The flange 21 of the cover plate assembly with a T-shaped pole provided by this utility model is fixed to the bottom surface of the end cover 1 by an insulating sealant layer 23. The top of the protruding pole 20 extends through the mounting hole 10 to the top of the end cover 1 as an external electrode contact. A retaining ring 22 is fitted at the upper end of the protruding pole 20 of the end cover 1. The retaining ring 22 and the end cover 1 are sealed and fixedly connected by the insulating sealant layer 23. Therefore, the entire pole 2 structure and the end cover 1 form a "T"-shaped sandwich structure, which improves the connection firmness and stability between the two and effectively prevents electrolyte leakage. On the other hand, the retaining ring 22 and the protruding pole 20 are laser welded together. Therefore, the end face of the retaining ring 22 can also become an external electrode contact, increasing the current flow capacity of the pole 2.

[0045] Specific examples Figure 3 and Figure 4As shown, the convex column 20 and the flange portion 21 are integrally formed structures, making their overall structure stronger and more solid. When the pole column 2 is encapsulated on the end cover 1, first, the upper part of the convex column 20 is passed through the mounting hole 10 from below the end cover 1 to above the end cover 1. At this time, the flange portion 21 and the insulating sealant layer 23 at the bottom of the end cover 1 are closely fitted and connected, so that the convex column 20 can be positioned on the end cover 1. Then, the clamping ring 22 is sleeved downwards from the upper end of the convex column 20. At this time, the clamping ring 22 and the insulating sealant layer 23 on the top surface of the end cover 1 are closely fitted and connected, so that the entire pole column 2 structure (i.e., the clamping ring 22, the convex column 20, and the flange portion 21) is hermetically fixed on the end cover 1 through the insulating sealant layers 23 on both the upper and lower sides. A "soil" - shaped structure is formed between the clamping ring 22, the convex column 20, and the flange portion 21, firmly clamping the end cover 1 in the middle. The stability and firmness of this structure are further enhanced, effectively solving the problem that the traditional riveting structure is prone to looseness due to false riveting, resulting in easy shaking between the pole column 2 and the end cover 1 and electrolyte leakage. To further improve the stability and sealing performance between the clamping ring 22 and the convex column 20, after the clamping ring 22 and the convex column 20 are assembled, the connection between the clamping ring 22 and the convex column 20 is laser - welded.

[0046] In this embodiment, as Figure 2 shown, an upper sink 11 is provided around the mounting hole 10 on the upper end surface of the end cover 1, and an insulating sealant layer 23 is provided in the upper sink 11. When the clamping ring 22 is assembled on the convex column 20, the bottom surface of the clamping ring 22 is in contact with the insulating sealant layer 23, and the outer peripheral edge of its bottom is clamped with the inner wall of the upper sink 11. Of course, laser welding can also be performed at the connection between the clamping ring 22 and the end cover 1. In this way, the clamping ring 22 can be positioned in the upper sink 11. This structure helps to ensure that when using a battery with this cover assembly in different temperature and humidity environments, the pole column 2 will not cause loosening or falling off of the clamping ring 22 due to performance changes of the insulating sealant layer 23 caused by changes in the use environment, further strengthening the firmness and stability of this structure.

[0047] Furthermore, as Figure 5 shown, a lower sink 12 is provided around the mounting hole 10 on the bottom surface of the end cover 1, and an insulating sealant layer 23 is provided in the lower sink 12. When the convex column 20 is encapsulated in the mounting hole 10 from the bottom of the end cover 1, the top surface of the flange portion 21 is in contact with the insulating sealant layer 23, and the upper part of the flange portion 21 is placed in the lower sink 12; its lower part protrudes below the end cover 1. In this structure, the flange portion 21 can place its upper part in the lower sink 12, which also helps to ensure that when using a battery with this cover assembly in different temperature and humidity environments, the pole column 2 will not cause loosening or falling off of the convex column 20 due to performance changes of the insulating sealant layer 23 caused by changes in the use environment, further strengthening the firmness and stability of this structure.

[0048] Furthermore, such as Figure 2 and Figure 3 As shown, an isolation plate 3 is installed below the end cap 1. The isolation plate 3 has a through-hole 30, and the isolation plate 3 is snapped onto the flange 21 through the through-hole 30. The isolation plate 3 can effectively insulate and isolate the end cap 1 and the battery cell, prevent short circuits, and improve the safety and stability of the battery. On the other hand, in order to improve the sealing efficiency between the isolation plate 3, the terminal post 2, and the end cap 1, at least two positioning countersunk holes (such as...) are provided on the bottom surface of the end cap 1. Figure 5 At least two positioning posts matching the countersunk holes are provided on the top surface of the separator 3. The positioning holes and posts enable rapid and precise encapsulation, improving encapsulation efficiency. Specifically, a step 16 is provided at the bottom edge of the end cap 1. The step 16 facilitates efficient and precise encapsulation of the cover assembly and the battery housing 4; the diameter of the separator 3 is smaller than the diameter of the end cap 1. When the cover assembly is encapsulated on the battery housing 4, the separator 3 is placed inside the battery housing 4; a busbar 34 is connected to the bottom end of the flange 21. The busbar 34 facilitates cell connection between the battery cell tabs and the terminals 2 on the cover assembly, improving the current flow performance between the terminals 2 and the battery cell.

[0049] In this embodiment, as Figures 1 to 3 As shown, the end cap 1 and the isolation plate 3 are respectively provided with a first through hole 13 and a second through hole 31 on the same axis. An explosion-proof valve 32 is installed on the second through hole 31, and a protective plate 131 is installed on the first through hole 13. The protective plate 131 is provided with a pressure relief hole 132. The setting of the explosion-proof valve 32 improves the safety of the battery. When thermal runaway occurs inside the battery, resulting in high gas pressure, the explosion-proof valve 32 will rupture immediately. At this time, the inside of the battery will be connected to the outside, and the high-pressure gas will be discharged through the pressure relief hole 132, effectively preventing the risk of battery explosion.

[0050] Furthermore, the end cap 1 and the isolation plate 3 are respectively provided with a coaxial upper injection hole 14 and a lower injection hole 33. A sealing pin 15 is installed on the upper injection hole 14. The inner wall of the upper injection hole 14 and the outer circumference of the sealing pin 15 are respectively conical. The conical shape helps to improve the fit and sealing between the sealing pin 15 and the upper injection hole 14. After the sealing pin 15 is sealed in the upper injection hole 14, the top surface of the sealing pin 15 is flush with the top surface of the end cap 1. On the other hand, the bottom of the sealing pin 15 is provided with a cavity 151. The sealing pin 15 and the end cap 1 are effectively sealed by laser welding to prevent electrolyte leakage. Thus, when a small amount of electrolyte remains in the upper injection hole 14, the sealing pin 15 can also seal it. At this time, the residual electrolyte can be squeezed into the cavity 151, preventing the residual electrolyte from affecting the welding effect between the sealing pin 15 and the end cap 1.

[0051] Example 2

[0052] like Figure 7 As shown, this embodiment provides a battery including a battery casing 4, a battery cell, and a cover plate assembly with T-shaped terminals as in Embodiment 1. The cover plate assembly with T-shaped terminals is encapsulated within the opening of the battery casing 4, forming a receiving cavity, and the battery cell is disposed within the receiving cavity. The connection between the terminals 2 and the end cap 1 on this battery is highly stable, effectively preventing the risk of electrolyte leakage and improving the safety of battery use.

[0053] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the present utility model without departing from the scope of the present utility model shall fall within the scope of the present utility model.

Claims

1. A cover plate assembly having a dog leg post, characterized by, include: End cap, wherein the end cap is provided with a through mounting hole; The pole includes a protruding post and a flange connected to the bottom end of the protruding post. The protruding post extends through the mounting hole to the top of the end cap. A retaining ring is fitted on the upper part of the protruding post located on the end cap. The top and bottom surfaces of the end cap are respectively provided with insulating sealant layers around the mounting holes, and the retaining ring and flange are respectively sealed to the top and bottom surfaces of the end cap through the insulating sealant layers; The retaining ring and the protruding post are fixed together by laser welding.

2. The cover plate assembly with the I-beam post according to claim 1, wherein, The upper end face of the end cap is provided with a recessed platform around the mounting hole, the insulating sealant layer is provided on the recessed platform, and the bottom outer circumferential edge of the retaining ring is engaged with the inner wall of the recessed platform.

3. The cover plate assembly with the doghouse pole according to claim 2, characterized in that, The bottom surface of the end cap is provided with a recessed platform around the mounting hole, the insulating sealant layer is provided on the recessed platform, and the upper part of the flange is placed inside the recessed platform.

4. The cover plate assembly with the I-beam post of claim 3, wherein, An isolation plate is installed below the end cap, and the isolation plate has a through-hole for venting. The isolation plate is snapped onto the flange through the vent.

5. A cover plate assembly with a T-shaped pole as described in claim 4, characterized in that, The end cap and the isolation plate are provided with a first through hole and a second through hole on the same axis. An explosion-proof valve is installed on the second through hole, and a protective plate is installed on the first through hole. The protective plate is provided with a pressure relief hole.

6. A cover plate assembly with a T-shaped pole according to claim 5, characterized in that, The end cap and the isolation plate are respectively provided with a coaxial upper injection hole and a lower injection hole, and a sealing pin is installed on the upper injection hole.

7. A cover plate assembly with a T-shaped pole as described in claim 6, characterized in that, The inner wall of the upper injection hole and the outer circumference of the sealing nail are both conical, and the bottom of the sealing nail is provided with a cavity.

8. A cover plate assembly with a T-shaped pole according to claim 7, characterized in that, The end cap has a step at the bottom edge, and the diameter of the isolation piece is smaller than the diameter of the end cap.

9. A cover plate assembly with a T-shaped pole according to claim 8, characterized in that, A manifold is connected to the bottom end of the flange.

10. A battery comprising a battery casing, a battery cell, and a cover plate assembly with T-shaped terminals as described in any one of claims 1-9, characterized in that, The cover plate assembly with the T-shaped pole is encapsulated in the opening of the battery casing and forms a receiving cavity, and the battery cell is disposed in the receiving cavity.

Images