Explosion-proof assembly and lithium battery top cover

Abstract

The utility model relates to the technical field of batteries, in particular to an explosion-proof assembly and a lithium battery top cover, which comprise an explosion-proof assembly and a top cover body, the anti-explosion assembly comprises an upper groove, a lower groove and an X-shaped nick, wherein the upper groove and the lower groove are formed in the anti-explosion piece body, and the upper groove is provided with the X-shaped nick. The top cover body comprises a top cover plate, pole assemblies located on the two sides of the top cover plate and a lower plastic part fixed to the lower portion of the top cover plate, and the top cover plate and the lower plastic part are connected together through the pole assemblies. Compared with the prior art, the lithium battery top cover is simple in structure and good in sealing performance, an anti-explosion assembly on the lithium battery top cover is uniform in stress and good in consistency, and the service life of the lithium battery top cover is prolonged. And effective blasting can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an explosion-proof component and a lithium battery top cover. Background Art

[0002] A battery explosion-proof component refers to a safety device in lithium-ion batteries and other battery products that automatically activates when the internal pressure of the battery is too high to release the pressure to reduce the pressure inside the battery, thereby preventing the battery from exploding. The battery explosion-proof component needs to ensure that it can be reliably activated when necessary and will not cause unnecessary safety problems due to premature or incorrect activation.

[0003] The design of the lithium battery top cover that cooperates with the battery explosion-proof component is also very important. The coordinated use of the two can ensure the normal operation of the internal battery.

[0004] When the existing explosion-proof components explode, due to the large difference in front and rear explosion pressures, the various parts of the explosion-proof components cannot be evenly stressed, resulting in poor consistency during explosion, resulting in poor effect of the explosion-proof components; secondly, the lithium battery top cover that cooperates with the explosion-proof components is complex to process and has poor sealing, which will also affect the blasting effect of the explosion-proof components.

[0005] Based on the above problems, we will design an explosion-proof component and a lithium battery top cover. The lithium battery top cover has a simple structure and good sealing. The explosion-proof component on it has uniform force and good consistency, and can explode effectively. Utility Model Content

[0006] The utility model aims to overcome the defects in the above-mentioned prior art and provides an explosion-proof component and a lithium battery top cover. The lithium battery top cover has a simple structure and good sealing performance. The explosion-proof component thereon is subjected to uniform force and good consistency and can be effectively exploded.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is: an explosion-proof component, including an explosion-proof plate and a protective patch located directly above the explosion-proof plate, the explosion-proof plate includes an explosion-proof plate body, the top of the explosion-proof plate body forms an upper groove around its edge, and symmetrical and intersecting first and second notches are formed inside the upper groove, and the first and second notches both extend from the upper end of the upper groove to the lower end of the other side of the upper groove.

[0008] As a preferred solution of the utility model, the intersecting first notch and second notch divide the explosion-proof disk body into a left-right symmetrical block A and a top-bottom symmetrical block B.

[0009] As a preferred solution of the present invention, the side surfaces of the first notch and the second notch are the same in size and are rectangular.

[0010] As a preferred solution of the utility model, a lower groove is formed at the bottom of the explosion-proof plate body, and the diameter of the lower groove is greater than the diameter of the upper groove.

[0011] As a preferred solution of the utility model, the explosion-proof disk includes a connecting portion surrounding the explosion-proof disk body, the connecting portion is welded to the top cover plate, and the thickness of the connecting portion is greater than the thickness of the explosion-proof disk body.

[0012] A lithium battery top cover, comprising an explosion-proof component and a top cover body;

[0013] The top cover body includes a top cover plate, pole assemblies located on both sides of the top cover plate, and a lower plastic part fixed below the top cover plate. A protrusion is formed on the top of the top cover plate, and a positioning groove is formed on the protrusion toward the pole assembly side. The lower plastic part has a card slot formed on the side toward the pole assembly.

[0014] As a preferred solution of the utility model, the pole assembly includes an upper plastic part, a pole and a seal, a spline is formed in the middle of the pole and is surrounded by it, a buckle portion is formed at the bottom of the pole and is inserted into a slot, a spline groove is formed on the upper plastic part facing the pole side and cooperates with the spline, and a groove is formed at the bottom of the upper plastic part and cooperates with the protrusion and a positioning block is formed and cooperates with the positioning groove.

[0015] As a preferred solution of the utility model, the sealing member is located between the top cover plate and the pole.

[0016] As a preferred solution of the utility model, the pole column includes a negative pole column and a positive pole column, and the negative pole column and the positive pole column are respectively located on one side of the top cover plate.

[0017] As a preferred solution of the utility model, the top cover plate includes a liquid injection port, and a liquid injection portion corresponding to the liquid injection port is formed on the lower plastic part, and the liquid injection portion protrudes toward a side away from the top cover plate.

[0018] The beneficial effects of the utility model are:

[0019] 1. Compared with the prior art, the upper groove and the lower groove of the utility model make the explosion-proof plate thinner, and the perception of the pressure change inside the lithium battery is more sensitive, which is convenient for the explosion-proof plate to explode. The X-shaped first notch and the second notch evenly divide the explosion-proof plate into 4 pieces, which plays a guiding role, making the force on the explosion-proof plate more uniform and consistent, thereby improving the success rate and efficiency of the explosion-proof plate.

[0020] 2. The protective patch of the utility model is pasted on the top of the top cover plate to protect the explosion-proof plate from external interference so that it can perform its blasting function.

[0021] 3. The thickness of the connection part of the utility model is greater than the thickness of the explosion-proof plate body, so that the explosion-proof plate can be firmly fixed on the top cover plate, ensuring the stability of the explosion-proof plate.

[0022] 4. The pole assembly and seal of the utility model tightly connect the top cover plate and the lower plastic part together, fill the electrolyte into the liquid injection port and the liquid injection part and seal them with the liquid injection nails to achieve the sealing and conduction inside the lithium battery, so that the lithium battery can function effectively.

[0023] 5. The upper plastic part of the utility model adopts the process of rubber coating, and the matched pole, seal, lower plastic and top cover are directly connected and formed to play the role of fastening and anti-twist. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the utility model;

[0025] Figure 2 It is a front cross-sectional view of the utility model;

[0026] Figure 3 It is an enlarged view of the A part of the utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the utility model explosion-proof plate Figure 1 ;

[0028] Figure 5 This is a schematic diagram of the structure of the utility model explosion-proof plate Figure 2 ;

[0029] Figure 6 It is an enlarged view of B of the utility model;

[0030] Figure 7 It is a structural schematic diagram of the pole of the utility model;

[0031] The accompanying drawings in the figure are as follows: explosion-proof disk 1, protection patch 2, top cover plate 3, pole assembly 4, lower plastic part 5, upper groove 11, first notch 12, second notch 13, lower groove 14, protrusion 31, liquid injection port 32, positioning groove 33, upper plastic part 41, pole 42, sealing part 43, slot 51, liquid injection part 52, connecting part 101, spline groove 411, groove 412, positioning block 413, spline 421, buckle part 422. DETAILED DESCRIPTION

[0032] The following is an explanation and description of the technical scheme of the embodiment of the utility model in conjunction with the drawings of the embodiment of the utility model, but the following embodiment is only a preferred embodiment of the utility model, not all. Based on the embodiment in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the utility model.

[0033] In the following description, terms such as "inside", "outside", "up", "down", "left", "right", etc. that indicate directions or positional relationships are only used to facilitate the description of the embodiments and simplify the description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction. Therefore, it should not be understood as a limitation on the present invention.

[0034] like Figure 1-Figure 5 As shown, an explosion-proof component includes an explosion-proof disc 1 and a protective patch 2 located directly above the explosion-proof disc 1, wherein the explosion-proof disc 1 includes an explosion-proof disc body and a connecting portion 101 surrounding the explosion-proof disc body, an upper groove 11 is formed on the top of the explosion-proof disc body around its edge, and a symmetrical and intersecting first notch 12 and a second notch 13 are formed inside the upper groove 11, and the first notch 12 and the second notch 13 both extend from the upper end of the upper groove 11 to the lower end of the other side of the upper groove 11; the connecting portion 101 is welded on the top cover plate, and the thickness of the connecting portion 101 is greater than the thickness of the explosion-proof disc body.

[0035] The explosion-proof plate 1 of the utility model is welded to the top cover plate through the connecting portion 101. When the internal pressure of the lithium battery is too high, it will automatically explode to release the pressure to reduce the internal pressure of the lithium battery, thereby preventing the battery from exploding.

[0036] An upper groove 11 is formed on the explosion-proof plate 1 to fit the edge of the explosion-proof plate 1 so as to make the explosion-proof plate 1 thinner, and an X-shaped first notch 12 and a second notch 13 are formed crosswise inside the upper groove 11 through a cold pressing process so as to make the explosion-proof plate 1 thinner. When subjected to the pressure inside the lithium battery, the X-shaped notch will play a guiding role, and the explosion-proof plate 1 can be evenly exploded along the X-shaped notch, so that the impact pressure on each surface of the explosion-proof plate 1 is consistent, and the explosion of the explosion-proof plate 1 is more stable.

[0037] The intersecting first notch 12 and second notch 13 divide the explosion-proof disk body into a left-right symmetrical block A and a top-bottom symmetrical block B. The notch sides of the first notch 12 and second notch 13 are the same in size and rectangular in shape.

[0038] The areas of block A and block B are similar, which is similar to dividing the explosion-proof plate body into 4 equal blocks of the same area. Under the guidance of the rectangular notch, the explosion-proof plate 1 can be quickly exploded, thereby improving the efficiency of the explosion of the explosion-proof plate 1.

[0039] A lower groove 14 is formed at the bottom of the explosion-proof plate body. The lower groove 14 makes the explosion-proof plate 1 thinner, and the diameter of the lower groove 14 is larger than the diameter of the upper groove 11, so that the explosion-proof plate 1 is more sensitive to the pressure inside the lithium battery, which facilitates the explosion of the explosion-proof plate 1 along the direction of the lower groove 14.

[0040] In general, compared with the prior art, the upper groove 11 and the lower groove 14 of the utility model make the explosion-proof plate 1 thinner. Accordingly, the pressure change inside the lithium battery is more sensitive to facilitate the explosion of the explosion-proof plate 1. The X-shaped first notch 12 and the second notch 13 evenly divide the explosion-proof plate 1 into 4 pieces, which plays a guiding role, so that the force on the explosion-proof plate 1 is more uniform and consistent, thereby improving the success rate and efficiency of the explosion of the explosion-proof plate 1.

[0041] Furthermore, the thickness of the connection portion 101 surrounding the explosion-proof disc body is greater than the thickness of the explosion-proof disc body, and the thickness of the connection portion 101 is at least twice the thickness of the explosion-proof disc body, so that the explosion-proof disc 1 can be firmly fixed on the top cover plate to ensure the stability of the explosion-proof disc 1.

[0042] The protective patch 2 is pasted on the top of the top cover plate to protect the explosion-proof disc 1 from external interference so that it can perform its explosion function.

[0043] like Figure 1-Figure 2 , Figure 6-Figure 7 As shown, a lithium battery top cover includes an explosion-proof component and a top cover body; the top cover body includes a top cover plate 3, pole assemblies 4 located on both sides of the top cover plate 3 and a lower plastic part 5 fixed below the top cover plate 3, the pole assembly 4 connects the top cover plate 3 and the lower plastic part 5 together, a protrusion 31 is formed on the top of the top cover plate 3, a positioning groove 33 is formed on the protrusion 31 toward the pole assembly 4 side, and a card groove 51 is formed on the lower plastic part 5 toward the pole assembly 4 side.

[0044] The pole assembly 4 includes an upper plastic part 41, a pole 42 and a seal 43. A spline 421 is formed in the middle of the pole 42 and is arranged around it. A buckle portion 422 for snapping into the slot 51 is formed at the bottom of the pole 42. A spline groove 411 for matching with the spline 421 is formed on the upper plastic part 41 toward the side of the pole 42. A groove 412 for matching with the protrusion 31 and a positioning block 413 for matching with the positioning groove 33 are formed at the bottom of the upper plastic part 41.

[0045] The pole 42 includes a negative pole and a positive pole, and the negative pole and the positive pole are each located on one side of the top cover plate 3 .

[0046] The top cover plate 3 includes a liquid injection port 32 , and a liquid injection portion 52 corresponding to the liquid injection port 32 is formed on the lower plastic part 5 , and the liquid injection portion 52 protrudes toward a side away from the top cover plate 3 .

[0047] The seal 43 is located between the top cover plate 3 and the pole 42. The seal 43 may be a sealing ring that is resistant to corrosion by the electrolyte. It not only serves to isolate the air, but also prevents the electrolyte from leaking along the pole.

[0048] The upper plastic part 41 of the utility model is an injection molded part. The lower plastic part 5 is inserted under the top cover plate 3. The sealing part 43 is inserted into the pole 42 and passes through the lower plastic part 5 and the top cover plate 3 in sequence. At this time, the buckle part 422 at the bottom of the pole 42 is inserted into the card groove 51 of the lower plastic part 5. The assembled lower plastic part 5, the top cover plate 3, the pole 42, and the sealing part 43 are placed in a specified mold. The injection rubber enters between the top cover plate 3, the pole 42 and the sealing part 43 through the mold, and the top cover plate 3, the lower plastic part 5, the pole 42, and the sealing part 43 are connected together. The injection molded rubber forms the upper plastic part 41. The upper plastic part 41 has a spline groove 411 that can cooperate with the spline 421, a groove 412 that cooperates with the protrusion 31, and a positioning block 413 that cooperates with the positioning groove 33.

[0049] The upper plastic part 41 is encapsulated by a rubber coating process, and the matched pole 42, the seal 43, the lower plastic 5, and the top cover plate 3 are directly connected and formed to play a role of tightening and anti-twist.

[0050] The pole 42 is divided into a positive pole and a negative pole on the top cover plate 3. The electrolyte enters the lithium battery along the injection port 32 and the injection part 52. After the electrolyte inside the lithium battery is filled enough, an injection nail is placed at the injection port 32 for sealing. Under the action of the upper plastic part 41 and the sealing part 43, the interior of the lithium battery is sealed, and the positive pole assembly and the negative pole assembly are conductive, so that the lithium battery can function.

[0051] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention; therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

[0052] Although this article uses more of the following figures: explosion-proof disk 1, protection patch 2, top cover plate 3, pole assembly 4, lower plastic part 5, upper groove 11, first notch 12, second notch 13, lower groove 14, protrusion 31, liquid injection port 32, positioning groove 33, upper plastic part 41, pole 42, sealing member 43, slot 51, liquid injection portion 52, connecting portion 101, spline groove 411, groove 412, positioning block 413, spline 421, buckle portion 422 and other terms, the possibility of using other terms is not excluded; these terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. An explosion-proof component, characterized in that: The invention comprises an explosion-proof disc (1) and a protective patch (2) located directly above the explosion-proof disc (1), wherein the explosion-proof disc (1) comprises an explosion-proof disc body, wherein an upper groove (11) is formed at the top of the explosion-proof disc body and surrounds its edge, wherein a symmetrical and intersecting first notch (12) and a second notch (13) are formed inside the upper groove (11), and the first notch (12) and the second notch (13) both extend from the upper end of the upper groove (11) to the lower end of the other side of the upper groove (11).

2. An explosion-proof assembly according to claim 1, characterized in that: The first notch (12) and the second notch (13) intersecting each other divide the explosion-proof disk body into a left-right symmetrical block A and a top-bottom symmetrical block B.

3. An explosion-proof assembly according to claim 2, characterized in that: The first notch (12) and the second notch (13) have side surfaces of the same size and are rectangular.

4. An explosion-proof assembly according to claim 3, characterized in that: A lower groove (14) is formed at the bottom of the explosion-proof disc body, and the diameter of the lower groove (14) is greater than the diameter of the upper groove (11).

5. An explosion-proof assembly according to claim 1, characterized in that: The explosion-proof disc (1) comprises a connecting portion (101) surrounding a body of the explosion-proof disc, the connecting portion (101) being welded to the top cover plate, and the thickness of the connecting portion (101) being greater than the thickness of the body of the explosion-proof disc.

6. A lithium battery top cover, characterized in that: It comprises the explosion-proof assembly according to any one of claims 1 to 5 and a top cover body; The top cover body comprises a top cover plate (3), pole assemblies (4) located on both sides of the top cover plate (3), and a lower plastic part (5) fixed below the top cover plate (3); a protrusion (31) is formed on the top of the top cover plate (3); a positioning groove (33) is formed on the protrusion (31) on a side facing the pole assembly (4); and a clamping groove (51) is formed on the lower plastic part (5) on a side facing the pole assembly (4).

7. A lithium battery top cover according to claim 6, characterized in that: The pole assembly (4) comprises an upper plastic part (41), a pole (42) and a sealing part (43); a spline (421) is formed around the middle of the pole (42); a buckle portion (422) is formed at the bottom of the pole (42) for snapping into a slot (51); a spline groove (411) is formed on the side of the upper plastic part (41) facing the pole (42) and matches the spline (421); and a groove (412) is formed at the bottom of the upper plastic part (41) and matches the protrusion (31) and a positioning block (413) matches the positioning groove (33).

8. A lithium battery top cover according to claim 7, characterized in that: The sealing member (43) is located between the top cover plate (3) and the pole (42).

9. A lithium battery top cover according to claim 7, characterized in that: The pole (42) comprises a negative pole and a positive pole, and the negative pole and the positive pole are each located on one side of the top cover plate (3).

10. A lithium battery top cover according to claim 7, characterized in that: The top cover plate (3) comprises a liquid injection port (32), and a liquid injection portion (52) corresponding to the liquid injection port (32) is formed on the lower plastic part (5), and the liquid injection portion (52) protrudes towards a side away from the top cover plate (3).

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