Battery cell top cover and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell top cover and a battery. The battery cell top cover comprises a top cover piece and an anti-explosion valve, the top cover piece is provided with a first surface and a second surface which are oppositely arranged, and the top cover piece is provided with an anti-explosion liquid injection opening penetrating through the top cover piece and a first connecting part which is annularly arranged on the anti-explosion liquid injection opening and is convexly arranged from the first surface; the anti-explosion liquid injection port is configured to be capable of injecting electrolyte; the explosion-proof valve comprises an explosion part with nicks and a second connecting part annularly arranged on the explosion part, and the second connecting part is detachably connected with the first connecting part; according to the mode, the explosion-proof valve can be detached and replaced, the installation procedures are reduced, the assembly efficiency is improved, and meanwhile, the battery is convenient to exhaust, relieve pressure and add electrolyte, so that the safety and the stability of a battery cell are ensured.

Description

Technical Field

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

[0002] As an essential component of new energy equipment, batteries are widely used in people's lives, such as in electric vehicles, home energy storage, portable batteries, and digital batteries. Because batteries are increasingly integrated into our lives, safety is paramount. Battery explosion-proof valves are key components for battery safety. When a battery experiences thermal runaway, a large amount of gas is generated inside the battery in a short period. The explosion-proof valve can promptly release this gas, preventing excessive internal pressure and potential explosion.

[0003] Existing battery explosion-proof valves are typically made from thin aluminum sheets, stamped into small circular or elliptical shapes. A groove is machined into the sheet to create a weak point; under pressure, this weak point cracks, allowing the valve to open and release pressure. Currently, after stamping, explosion-proof valves are usually annealed to ensure stable performance. After processing and cleaning, the explosion-proof valve is welded to the battery top cover, which is then assembled into the battery. The battery top cover usually has a separate electrolyte injection hole for filling with electrolyte. After electrolyte filling, a sealing aluminum pin is welded to the injection hole to ensure the battery's airtightness.

[0004] However, the battery explosion-proof valves of this technology have the following problems:

[0005] 1. The burst value of the explosion-proof valve is greatly affected by temperature. The high temperature during the welding of the explosion-proof valve to the battery top cover affects the burst value of the explosion-proof valve.

[0006] 2. There were welding defects during the welding process of the explosion-proof valve to the battery top cover;

[0007] 3. The explosion-proof valve and the injection hole are separate. The explosion-proof valve needs to be welded, and the sealing aluminum nails need to be welded after the injection is completed. The process is complicated, inefficient and costly. In addition, the injection hole is small, the injection efficiency is low and the wettability of the electrode sheet is poor after injection.

[0008] 4. The explosion-proof valve is disposable and is the most vulnerable part of the battery. It is easily damaged by collisions during transportation or use, causing the explosion-proof valve to fail.

[0009] 5. The explosion-proof valve will only rupture and fail when the internal pressure of the battery reaches a specified level. However, the battery will generate gas during charging and discharging, causing the battery to swell and posing a significant safety hazard.

[0010] 6. The explosion-proof valve and the electrolyte injection hole are sealed by welding. During battery use, some electrolyte will be consumed, and the battery life cannot be extended by adding electrolyte. Utility Model Content

[0011] This invention provides a cell top cover and a battery that can solve the above-mentioned problems.

[0012] To solve the above-mentioned technical problems, the present invention provides a battery cell top cover, comprising:

[0013] A top cover sheet having a first surface and a second surface disposed opposite to each other. The top cover sheet is provided with an explosion-proof liquid injection port penetrating the top cover sheet and a first connecting portion circumferentially disposed around the explosion-proof liquid injection port and protruding from the first surface. The explosion-proof liquid injection port is configured to be able to inject electrolyte.

[0014] An explosion-proof valve, comprising a blasting portion having grooves and a second connecting portion annularly disposed around the blasting portion, the second connecting portion being detachably connected to the first connecting portion.

[0015] According to one embodiment of the present invention, the first connecting part and the second connecting part are threadedly connected.

[0016] According to one embodiment of the present invention, the top cover of the battery cell further includes a first sealing member sleeved on the outside of the first connecting portion.

[0017] According to one embodiment of the present invention, the top cover of the battery cell further includes an upper plastic disposed above the top cover sheet and in contact with the first surface, a lower plastic disposed below the top cover sheet and in contact with the second surface, and an electrode post penetrating the top cover sheet and connected to the upper plastic and the lower plastic respectively.

[0018] According to one embodiment of the present invention, the top cover plate has a first pole hole located on one side of the explosion-proof liquid injection port and a second pole hole located on the other side of the explosion-proof liquid injection port; the pole includes a first pole hole that passes through the first pole hole and a second pole hole that passes through the second pole hole.

[0019] According to one embodiment of the present invention, the upper plastic includes a first upper plastic adapted to the first electrode post and a second upper plastic adapted to the second electrode post, wherein the first upper plastic and the second upper plastic are independently disposed.

[0020] According to one embodiment of the present invention, the lower plastic has a first through hole corresponding to the first electrode hole and a second through hole corresponding to the second electrode hole; the first electrode sequentially passes through the first through hole and the first electrode hole and is connected to the first upper plastic, and the second electrode sequentially passes through the second through hole and the second electrode hole and is connected to the second upper plastic.

[0021] According to one embodiment of the present invention, the lower plastic is provided with a third through hole corresponding to the explosion-proof injection port.

[0022] According to one embodiment of the present invention, the top cover of the battery cell further includes a second sealing member sleeved on the outside of the first electrode post and a third sealing member sleeved on the outside of the second electrode post.

[0023] To solve the above-mentioned technical problems, another technical solution adopted by this utility model is: a battery, including the aforementioned cell top cover.

[0024] The beneficial effects of this utility model are as follows: A battery cell top cover includes a top cover sheet and an explosion-proof valve. The top cover sheet has a first surface and a second surface disposed opposite to each other. The top cover sheet is provided with an explosion-proof liquid injection port penetrating the top cover sheet and a first connecting portion circumferentially disposed around the explosion-proof liquid injection port and protruding from the first surface. The explosion-proof liquid injection port is configured to be able to inject electrolyte. The explosion-proof valve includes a punctured burst portion and a second connecting portion circumferentially disposed around the burst portion. The second connecting portion is detachably connected to the first connecting portion. Through the above method, this utility model can realize that the explosion-proof valve is detachable and replaceable, reducing installation steps and improving assembly efficiency. At the same time, it facilitates battery venting and depressurization, and electrolyte addition, thereby ensuring the safety and stability of the battery cell. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural schematic diagram of the top cover of the battery cell according to an embodiment of the present invention;

[0026] Figure 2 yes Figure 1 A schematic diagram of the decomposed structure;

[0027] Figure 3 This is a schematic diagram of the structure of an explosion-proof valve according to an embodiment of the present invention;

[0028] Figure 4 yes Figure 1 Sectional view along line AA;

[0029] Figure 5 yes Figure 4 A magnified view of a portion of region B in the middle.

[0030] The meanings of the labels in the attached diagram are as follows:

[0031] 100-Cell top cover; 10-Top cover plate; 20-Explosion-proof valve; 30-Upper plastic; 40-Lower plastic; 50-Terminal post; 60-First seal; 70-Second seal; 80-Third seal; 11-First surface; 12-Second surface; 101-Explosion-proof liquid injection port; 102-First terminal post hole; 103-Second terminal post hole; 104-First connecting part; 201-Explosion part; 202-Second connecting part; 2010-Scratching; 301-First upper plastic; 302-Second upper plastic; 401-First through hole; 402-Second through hole; 403-Third through hole; 501-First terminal post; 502-Second terminal post. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0033] The terms "first," "second," and "third" in this utility model are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this utility model are only used to explain the relative positional relationships and movement of the components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0034] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0035] Figure 1 This is a three-dimensional structural diagram of the top cover of the battery cell according to an embodiment of the present invention. Figure 2 yes Figure 1 A schematic diagram of the decomposed structure. (See attached diagram.) Figures 1-2 As shown, the battery cell top cover 100 includes: a top cover plate 10, an explosion-proof valve 20, an upper plastic 30, a lower plastic 40, and a terminal post 50. The top cover plate 10 has a first surface 11 and a second surface 12 disposed opposite to each other. The explosion-proof valve 20 is disposed on the first surface 11 and detachably connected to the top cover plate 10. The upper plastic 30 is attached to the first surface 11 of the top cover plate 10, and the lower plastic 40 is attached to the second surface 12 of the top cover plate 10. The terminal post 50 penetrates the top cover plate 10 and is connected to the upper plastic 30 and the lower plastic 40 respectively. Through the above method, the battery top cover 100 of this utility model embodiment can realize the detachable and replaceable explosion-proof valve 20, reduce the installation process, improve the assembly efficiency, and facilitate battery venting and depressurization, electrolyte addition, thereby ensuring the safety and stability of the battery cell.

[0036] Please see Figure 2 The top cover plate 10 is provided with an explosion-proof liquid injection port 101 penetrating the top cover plate 10, a first electrode post hole 102 located on one side of the explosion-proof liquid injection port 101, a second electrode post hole 103 located on the other side of the explosion-proof liquid injection port 101, and a first connecting portion 104 circumferentially disposed around the explosion-proof liquid injection port 101 and protruding from the first surface 11. The explosion-proof liquid injection port 101 is configured to be able to inject electrolyte. The first electrode post hole 102 is used to install a positive electrode post or a negative electrode post, and the second electrode post hole 103 is used to install a positive electrode post or a negative electrode post. The polarities of the electrodes installed in the first electrode post hole 102 and the second electrode post hole 103 can be opposite.

[0037] Please see Figure 2 and Figure 3 The explosion-proof valve 20 includes a bursting part 201 with grooves 2010 and a second connecting part 202 surrounding the bursting part 201.

[0038] The notch 2010 is a weak point of the explosion-proof valve 20 and can be circular, elliptical, square, etc. One or more notches 2010 can be provided. When multiple notches 2010 are provided, they are not discontinuous. In this embodiment, when the pressure reaches a certain level, the explosion-proof valve 20 breaks open at the notch 2010 of the burst section 201 to release pressure.

[0039] Please see Figure 4 and Figure 5The second connecting part 202 is detachably connected to the first connecting part 104, meaning the explosion-proof valve 20 and the top cover plate 10 are detachably connected. Compared to the welding method in related technologies, the detachable connection avoids the impact of high temperatures on the explosion-proof valve 20's burst value. Furthermore, no welding is required between the explosion-proof valve 20 and the top cover plate 10, and poor welding will not affect the battery's safety and reliability. In addition, the explosion-proof filling port 101 combines the filling hole and the explosion-proof hole into one, allowing for filling at the explosion-proof filling port 101. This results in high filling efficiency, good electrode wettability, and eliminates the need for welding sealing aluminum nails, reducing processes and improving assembly production efficiency. Compared to the non-removable explosion-proof valves of related technologies, when the explosion-proof valve 20 of this embodiment is damaged by external force, only the explosion-proof valve 20 needs to be replaced, which will not cause the entire battery to be scrapped, thereby reducing losses. When the battery swells, the explosion-proof valve 20 can be used to vent the battery, reducing battery safety hazards. If electrolyte needs to be added, the explosion-proof valve 20 can be removed, electrolyte can be added through the explosion-proof filling port 101, and then the explosion-proof valve 20 can be reinstalled to extend the battery's service life.

[0040] Furthermore, the connection methods between the first connecting part 104 and the second connecting part 202 include, but are not limited to: threaded connection, riveting, spring compression, etc. For example, Figure 5 As shown, the first connecting part 104 and the second connecting part 202 are threadedly connected. The first connecting part 104 is provided with an internal thread and the second connecting part 202 is provided with an external thread, or the first connecting part 104 is provided with an external thread and the second connecting part 202 is provided with an internal thread.

[0041] Please see Figure 1 and Figure 2 The electrode post 50 includes a first electrode post 501 that passes through the first electrode post hole 102 and a second electrode post 502 that passes through the second electrode post hole 103. The first electrode post 501 and the second electrode post 502 have different polarities; the first electrode post 501 is a positive electrode post or a negative electrode post, and the second electrode post 502 is a positive electrode post or a negative electrode post.

[0042] Please see Figure 1 and Figure 2 The upper plastic 30 includes a first upper plastic 301 adapted to the first electrode post 501 and a second upper plastic 302 adapted to the second electrode post 505. The first upper plastic 301 and the second upper plastic 302 are independently arranged.

[0043] Please see Figure 2The lower plastic 40 has a first through hole 401 corresponding to the first pole hole 102, a second through hole 402 corresponding to the second pole hole 103, and a third through hole 403 corresponding to the explosion-proof injection port 101. During installation, the first pole 501 passes through the first through hole 401 and the first pole hole 102 in sequence and is connected to the first upper plastic 301. The second pole 502 passes through the second through hole 402 and the second pole hole 103 in sequence and is connected to the second upper plastic 302.

[0044] Please see Figure 2 and Figure 5 The battery cell top cover 100 also includes a first sealing member 60 sleeved on the outside of the first connecting portion 104. The first sealing member 60 can be a rubber gasket, which can increase the sealing performance at the connection between the first connecting portion 104 and the second connecting portion 202. When the first connecting portion 104 and the second connecting portion 202 are threaded, it can prevent the threads from loosening.

[0045] Please see Figure 2 and Figure 4 The battery cell top cover 100 also includes a second sealing element 70 sleeved on the outside of the first terminal 501 and a third sealing element 80 sleeved on the outside of the second terminal 502. The second sealing element 70 and the third sealing element 80 can be rubber gaskets. The second sealing element 70 can increase the sealing between the first terminal 501 and the first upper plastic 301 and the lower plastic 40; the third sealing element 80 can increase the sealing between the second terminal 502 and the second upper plastic 302 and the lower plastic 40.

[0046] This utility model embodiment also provides a battery, which includes the aforementioned cell top cover 100. The assembly process of the battery is as follows: assembling the top cover plate 10, the second sealing element 70, the third sealing element 80, the first terminal 501, the second terminal 502, the first upper plastic 301, the second upper plastic 302, and the lower plastic 40 into a semi-finished top cover; assembling the semi-finished top cover, aluminum shell, and core together; injecting electrolyte through the explosion-proof injection port 101; installing the first sealing element 60 on the first connecting part 104, and sealing it with the explosion-proof valve 20; battery formation; removing the explosion-proof valve 20, injecting electrolyte a second time; and reinstalling the explosion-proof valve 20. The battery of this utility model embodiment enables the explosion-proof valve 20 to be detachable and replaceable, reducing installation steps, improving assembly efficiency, and facilitating battery venting and pressure relief, as well as electrolyte addition, thereby ensuring the safety and stability of the cell.

[0047] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, 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 battery cell top cover, characterized in that, include: A top cover sheet having a first surface and a second surface disposed opposite to each other. The top cover sheet is provided with an explosion-proof liquid injection port penetrating the top cover sheet and a first connecting portion circumferentially disposed around the explosion-proof liquid injection port and protruding from the first surface. The explosion-proof liquid injection port is configured to be able to inject electrolyte. An explosion-proof valve, comprising a blasting portion having grooves and a second connecting portion annularly disposed around the blasting portion, the second connecting portion being detachably connected to the first connecting portion.

2. The cell top cover according to claim 1, characterized in that, The first connecting part and the second connecting part are threaded together.

3. The cell top cover according to claim 1, characterized in that, The top cover of the battery cell also includes a first sealing element sleeved on the outside of the first connecting portion.

4. The cell top cover according to claim 1, characterized in that, The top cover of the battery cell also includes an upper plastic disposed above the top cover sheet and in contact with the first surface, a lower plastic disposed below the top cover sheet and in contact with the second surface, and an electrode post penetrating the top cover sheet and connected to the upper plastic and the lower plastic respectively.

5. The cell top cover according to claim 4, characterized in that, The top cover plate has a first pole hole located on one side of the explosion-proof injection port and a second pole hole located on the other side of the explosion-proof injection port; the pole includes a first pole hole that passes through the first pole hole and a second pole hole that passes through the second pole hole.

6. The cell top cover according to claim 5, characterized in that, The upper plastic includes a first upper plastic that is adapted to the first electrode post and a second upper plastic that is adapted to the second electrode post, wherein the first upper plastic and the second upper plastic are independently provided.

7. The cell top cover according to claim 6, characterized in that, The lower plastic has a first through hole corresponding to the first electrode hole and a second through hole corresponding to the second electrode hole; the first electrode passes through the first through hole and the first electrode hole in sequence and is connected to the first upper plastic, and the second electrode passes through the second through hole and the second electrode hole in sequence and is connected to the second upper plastic.

8. The cell top cover according to claim 7, characterized in that, The lower plastic section has a third through hole corresponding to the explosion-proof injection port.

9. The cell top cover according to claim 7, characterized in that, The top cover of the battery cell also includes a second sealing element sleeved on the outside of the first electrode post and a third sealing element sleeved on the outside of the second electrode post.

10. A battery, characterized in that, Including the cell top cover as described in any one of claims 1-9.

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