Cover plate assembly and battery

Abstract

The utility model provides a cover plate assembly and a battery. The cover plate assembly comprises a top cover plate and an insulating seat, the top cover plate is used for covering a shell of the battery, and a liquid injection hole is formed in the top cover plate; the insulating base is arranged on the side, facing the shell, of the top cover plate, a closed liquid storage cavity is formed between the insulating base and the top cover plate, the liquid storage cavity corresponds to the liquid injection hole in position and is communicated with the liquid injection hole, a liquid passing hole is formed in the side face, opposite to the side wall of the shell, of the insulating base, and the liquid passing hole is communicated with the liquid storage cavity so that electrolyte flowing through the liquid storage cavity can be guided into the shell; when the shell is extruded in a large area, the backflow electrolyte can be temporarily stored in the liquid storage cavity, the electrolyte is prevented from being sprayed out from the liquid injection opening, and therefore the liquid spraying phenomenon is improved, electrolyte pollution is reduced, and the personal safety of a production technician is guaranteed; meanwhile, the liquid passing hole is formed in the side surface, so that the electrolyte can be prevented from directly hitting the core cladding in the shell during liquid injection, the liquid injection pressure is buffered, the core cladding structure is prevented from being damaged, and the production yield of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a cover plate assembly and a battery. Background Art

[0002] Lithium battery technology is increasingly being used in energy fields such as 3C consumer electronics, power batteries, and energy storage. It can be divided into three categories based on the packaging shell: stainless steel cylindrical batteries, aluminum or stainless steel square batteries, and soft-pack batteries. Taking aluminum-shell square batteries as an example, aluminum-shell square batteries include a top cover and a shell. The core pack is placed in the shell. There is an injection hole on the top cover, and the electrolyte injected from the injection hole can enter the battery shell. During the injection process, the battery shell will be constrained by the clamp and squeezed over a large area. The electrolyte injected into the battery shell will flow back and spray out from the injection hole, causing electrolyte contamination to the top cover and the pole, and causing certain impacts on the production environment and the personal safety of operators. Utility Model Content

[0003] The embodiments of the utility model provide a cover plate assembly and a battery, which can improve the liquid spraying phenomenon, reduce electrolyte pollution, and improve the production yield of the battery.

[0004] In a first aspect, an embodiment of the present utility model provides a cover plate assembly, comprising:

[0005] A top cover plate, the top cover plate is used to cover the battery housing, and the top cover plate is provided with a liquid injection hole; and,

[0006] An insulating seat, wherein the insulating seat is arranged on a side of the top cover plate facing the shell, and a closed liquid storage cavity is formed between the insulating seat and the top cover plate, and the liquid storage cavity corresponds to the injection hole and is interconnected to store the electrolyte injected from the injection hole. A liquid through hole is provided on the side of the insulating seat opposite to the side wall of the shell, and the liquid through hole is connected to the liquid storage cavity to introduce the electrolyte in the liquid storage cavity into the shell.

[0007] In one embodiment, a partition is protrudingly provided on the bottom wall of the liquid storage cavity opposite to the top cover plate, and the partition divides the liquid storage cavity into two independent cavities;

[0008] The injection holes are respectively connected to the two cavities;

[0009] The liquid holes are communicated with the two cavities respectively.

[0010] In one embodiment, the partition plate is spaced apart from the top cover plate, and a liquid gap is provided between two opposite surfaces of the partition plate and the top cover plate, and the liquid gap is respectively connected to the liquid injection hole and the two cavities.

[0011] In one embodiment, a drainage slope is provided on the bottom wall of the liquid storage chamber opposite to the top cover plate, and in a direction close to the liquid passage hole, the drainage slope is inclined in a direction away from the top cover plate.

[0012] In one embodiment, a transitional camber is provided at the connection between the drainage slope and the side wall of the liquid storage chamber.

[0013] In one embodiment, the angle θ between the drainage slope and the top cover plate is set to 0° to 3°.

[0014] In one embodiment, the top cover plate has a first end and a second end opposite to each other, and the top cover plate is provided with the injection hole at a position close to the first end;

[0015] The insulating seat includes an insulating plate, which is partially recessed at a position adjacent to the first end to form a first recess, the opening of the first recess is arranged toward the top cover plate to enclose the liquid storage cavity together with the top cover plate, and the liquid hole is arranged on the side of the first recess close to the first end.

[0016] In one embodiment, a first annular groove is provided at the periphery of the opening of the first recess;

[0017] A second annular groove is correspondingly formed on the top cover plate, and the second annular groove is arranged opposite to the first annular groove and has a matching shape;

[0018] The cover plate assembly further includes a sealing ring disposed in the first annular groove and the second annular groove.

[0019] In one embodiment, the insulating plate is partially recessed near the second end to form a second recess, the opening of the second recess is arranged toward the top cover plate, and the second recess is used to be placed in the shell and fix the core package in the shell.

[0020] In a second aspect, an embodiment of the utility model further provides a battery, comprising:

[0021] A housing, wherein the housing has a receiving cavity with an opening on one side;

[0022] a cover plate assembly, the cover plate assembly covers the opening of the accommodating cavity, the liquid-passing hole on the lower insulating seat of the cover plate assembly is in communication with the accommodating cavity, and is used to inject electrolyte into the accommodating cavity; and

[0023] A core package assembly, wherein the core package assembly is disposed in the accommodating cavity;

[0024] Wherein, the cover plate assembly is configured as the above-mentioned cover plate assembly.

[0025] Beneficial effects of the embodiments of the utility model:

[0026] In an embodiment of the utility model, a top cover plate is covered on the battery shell, and a liquid injection hole is arranged on the top cover plate; an insulating seat is arranged on the side of the top cover plate facing the shell, and a closed liquid storage cavity is formed between the insulating seat and the top cover plate, and the liquid storage cavity is communicated with the liquid injection hole and the inside of the shell, and the electrolyte injected from the liquid injection hole can enter the shell after flowing through the liquid storage cavity; the setting of the liquid storage cavity can increase the electrolyte storage space, and when the shell is squeezed over a large area, the refluxed electrolyte can be temporarily stored in the shell. In the liquid storage cavity, the electrolyte is prevented from spraying out from the liquid injection port, thereby improving the liquid spraying phenomenon, reducing electrolyte pollution, and ensuring the personal safety of production technicians; at the same time, a liquid hole is set on the side of the insulating seat, so that the liquid storage cavity is connected with the inside of the shell. On the one hand, it can ensure that the electrolyte injected from the liquid injection hole can flow smoothly into the shell, and on the other hand, it can prevent the electrolyte from directly hitting the core package in the shell during injection, thereby buffering the injection pressure and avoiding the core package structure from being damaged due to excessive electrolyte flow rate during injection, thereby improving the production yield of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 is a structural schematic diagram of a cover plate assembly provided in an embodiment of the present application;

[0029] Figure 2 yes Figure 1 The cross-sectional view along AA in FIG.

[0030] Figure 3 It is a structural schematic diagram of the lower insulating seat provided by an embodiment of the utility model;

[0031] Figure 4 yes Figure 3 A cross-sectional view along BB in FIG.

[0032] Figure 5 yes Figure 4 An enlarged schematic diagram of a local C in FIG.

[0033] Figure 6 A schematic diagram of the structure of a battery provided in an embodiment of the present application.

[0034] The names of the components corresponding to the corresponding reference numerals in the figures are:

[0035] 1000 batteries;

[0036] 100 cover plate assembly, 1 top cover plate, 1a first end, 1b second end, 11 liquid injection hole, 12 second annular groove, 2 insulating seat, 21 liquid storage cavity, 21a bottom wall, 21b side wall, 211 cavity, 212 drainage slope, 213 transition arc surface, 22 side, 23 liquid hole, 24 liquid gap, 25 insulating plate, 251 first recess, 2511 opening, 2512 side, 252 first annular groove, 253 second recess, 2531 opening, 26 mounting hole, 3 partition plate, 4 sealing ring, 5 connecting plate, 6 upper insulating plate, 7 pole;

[0037] 200 housing, 201 receiving cavity, 201a opening;

[0038] 300 core pack. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0040] In a first aspect, an embodiment of the present invention provides a cover plate assembly. Figure 1 It is a structural schematic diagram of a cover plate assembly provided by an embodiment of the utility model; Figure 2 yes Figure 1 The cross-sectional view along AA in FIG. Figure 3 It is a structural schematic diagram of the lower insulating seat provided by an embodiment of the utility model; Figure 4 yes Figure 3 A cross-sectional view along BB in FIG. Figure 5 yes Figure 4 An enlarged schematic diagram of part A in FIG.

[0041] See also Figure 1 and Figure 2The cover plate assembly 100 includes a top cover plate 1 and an insulating seat 2. The top cover plate 1 is used to cover the shell 200 of the battery 1000. The top cover plate 1 is provided with a liquid injection hole 11; the insulating seat 2 is arranged on the side of the top cover plate 1 facing the shell 200, and a closed liquid storage cavity 21 is formed between the insulating seat 2 and the top cover plate 1. The liquid storage cavity 21 corresponds to the position of the liquid injection hole 11 and is connected to each other. A liquid through hole 23 is provided on the side 22 of the insulating seat 2 opposite to the side wall 21b of the shell 200. The liquid through hole 23 is connected to the liquid storage cavity 21 to introduce the electrolyte flowing through the liquid storage cavity 21 into the shell 200.

[0042] In an embodiment of the utility model, a top cover plate 1 is covered on a shell 200 of a battery 1000, and a liquid injection hole 11 is provided on the top cover plate 1; an insulating seat 2 is provided on the side of the top cover plate 1 facing the shell 200, and a closed liquid storage cavity 21 is formed between the insulating seat 2 and the top cover plate 1, and the liquid storage cavity 21 is interconnected with the liquid injection hole 11 and the inside of the shell 200, and the electrolyte injected from the liquid injection hole 11 can enter the shell 200 after flowing through the liquid storage cavity 21; the provision of the liquid storage cavity 21 can increase the electrolyte storage space, and when the shell is squeezed over a large area, the refluxed electrolyte can be temporarily stored. The electrolyte is stored in the liquid storage chamber 21 to prevent it from spraying out from the injection port, thereby improving the spraying phenomenon, reducing electrolyte pollution, and ensuring the personal safety of production technicians; at the same time, a liquid hole 23 is provided on the side 22 of the insulating seat 2, so that the liquid storage chamber 21 is connected with the inside of the shell 200. On the one hand, it can ensure that the electrolyte injected from the injection hole 11 can flow smoothly into the shell 200, and on the other hand, it can prevent the electrolyte from directly hitting the core package 300 in the shell 200 during injection, thereby buffering the injection pressure and avoiding the core package 300 structure from being damaged due to excessive electrolyte flow rate during injection, thereby improving the production yield of the battery 1000.

[0043] In one embodiment, see Figure 3 and Figure 4A partition 3 is protruding from the bottom wall 21a of the liquid storage chamber 21 opposite to the top cover plate 1, and the partition 3 divides the liquid storage chamber 21 into two independent chambers 211; the injection hole 11 is respectively connected to the two chambers 211; the liquid through hole 23 is respectively connected to the two chambers 211; that is, the electrolyte injected from the injection hole 11 is diverted to the two chambers 211, flows through the two chambers 211 respectively, and flows out from the liquid through hole 23, thereby further alleviating the injection pressure and electrolyte flow rate during injection, which can not only further protect the core package 300, but also improve the injection stability; and, when the battery 1000 shell 200 is squeezed over a large area, the refluxed electrolyte will be distributed to the two chambers 211, thereby slowing down the reflux speed of the electrolyte, and further preventing the electrolyte from spraying out from the injection hole 11.

[0044] The present application does not limit the communication mode between the injection hole 11 and the two cavities 211. In one embodiment, the partition 3 extends to connect with the top cover plate 1, each of the cavities 211 is sealed, the partition 3 is hollow, the interior of the partition 3 is connected with the injection hole 11, and two through holes are respectively provided on the two side walls 21b of the partition 3, so that the interior of the partition 3 is respectively connected with the two cavities 211. In one embodiment, the partition 3 is spaced apart from the top cover plate 1, and a liquid gap 24 is provided between the two opposite surfaces of the partition 3 and the top cover plate 1, and the liquid gap 24 is respectively connected with the injection hole 11 and the two cavities 211; that is, the electrolyte injected from the injection hole 11 flows into the two cavities 211 through the liquid gap 24.

[0045] It can be known that the electrolyte injected from the injection hole 11 needs to flow into the battery 1000 housing 200 from the liquid hole 23 after flowing through the liquid storage chamber 21. In order to reduce the residual amount of electrolyte in the liquid storage chamber 21 and ensure that the electrolyte is normally injected into the battery 1000 housing 200, in one embodiment, refer to Figure 5 The bottom wall 21a of the liquid storage chamber 21 opposite to the top cover plate 1 is provided with a drainage slope 212, and in the direction close to the liquid hole 23, the drainage slope 212 is inclined in the direction away from the top cover plate 1; by providing the drainage slope 212, the electrolyte in the liquid storage chamber 21 can be guided to the liquid hole 23, which is conducive to the electrolyte flowing into the battery 1000 shell 200 and reducing the residual electrolyte in the liquid storage chamber 21.

[0046] Moreover, in the liquid storage chamber 21, electrolyte is also easily accumulated at the connection between the bottom wall 21a and the side wall 21b; in one embodiment, a transition arc surface 213 is provided at the connection between the drainage slope 212 and the side wall 21b of the liquid storage chamber 21; in this way, the flow of electrolyte can be further facilitated and the residual electrolyte in the liquid storage chamber 21 can be further reduced.

[0047] In one embodiment, the entire side surface 22 of the insulating seat 2 opposite to the side wall 21 b of the shell 200 is opened to form the liquid passage hole 23 , so as to further ensure that no electrolyte remains in the liquid storage chamber 21 .

[0048] Taking the actual manufacturing process into consideration and to ensure the feasibility of the solution, in one embodiment, the angle θ between the drainage slope 212 and the top cover plate 1 is set to 0° to 3°.

[0049] In one embodiment, please refer to Figure 3 and Figure 4 The top cover plate 1 has a first end 1a and a second end 1b opposite to each other, and the top cover plate 1 is provided with the injection hole 11 at a position close to the first end 1a; the insulating seat 2 includes an insulating plate 25, and the insulating plate 25 is partially recessed at a position close to the first end 1a to form a first recess 251, and an opening 2511 of the first recess 251 is arranged toward the top cover plate 1 to enclose the liquid storage cavity 21 together with the top cover plate 1, and the liquid hole 23 is arranged on the side 2512 of the first recess 251 close to the first end 1a.

[0050] In one embodiment, a first annular groove 252 is provided at the periphery of the opening 2511 of the first recess 251; a second annular groove 12 is correspondingly provided on the top cover plate 1, and the second annular groove 12 is arranged opposite to the first annular groove 252 and has a shape matching that of the first annular groove 252; the cover plate assembly 100 also includes a sealing ring 4, and the sealing ring 4 is arranged in the first annular groove 252 and the second annular groove 12; by arranging the sealing ring 4, the sealing performance of the liquid storage chamber 21 is further improved.

[0051] In one embodiment, the insulating plate 25 is partially recessed at a position adjacent to the second end 1b to form a second recess 253, and an opening 2531 of the second recess 253 is disposed toward the top cover plate 1, and the second recess 253 is used to be placed in the shell 200 and fix the core package 300 in the shell 200.

[0052] Please refer to Figure 1The cover plate assembly 100 further includes a connecting plate 5, an upper insulating plate 6 and a pole 7. The connecting plate 5 is arranged on the side of the top cover plate 1 away from the battery 1000 housing 200. The upper insulating plate 6 is placed between the connecting plate 5 and the top cover plate 1 to insulate and isolate the connecting plate 5 and the top cover plate 1. The upper insulating plate 6 is provided with a first limiting groove on the side away from the top cover plate 1. The connecting plate 5 is limited and fixed in the first limiting groove. The top cover plate 1 is provided with a second limiting groove. The upper insulating plate 6 is limited and fixed in the second limiting groove. The top cover plate 1, the insulating seat 2, the connecting plate 5 and the upper insulating plate 6 are all provided with mounting holes 26 correspondingly; the pole 7 is passed through the mounting hole 26.

[0053] In the second aspect, the embodiment of the utility model further provides a battery 1000. The battery 1000 comprises a shell 200, a cover plate assembly 100 and a core pack 300; the shell 200 has a receiving cavity 201 with an opening 201a on one side; the cover plate assembly 100 is configured as the above-mentioned front cover plate assembly 100, the cover plate assembly 100 covers the opening 201a of the receiving cavity 201, and the liquid hole 23 on the lower insulating seat 2 of the cover plate assembly 100 is connected to the receiving cavity 201, so as to inject electrolyte into the receiving cavity 201; the core pack 300 is disposed in the receiving cavity 201.

[0054] In this embodiment, the cover plate assembly 100 is covered on the shell 200 of the battery 1000, and a liquid injection hole 11 is provided on the top cover plate 1 of the cover plate assembly 100; the insulating seat 2 of the cover plate assembly 100 is placed in the shell 200, and a closed liquid storage cavity 21 is formed between the insulating seat 2 and the top cover plate 1, and the liquid storage cavity 21 is interconnected with the liquid injection hole 11 and the accommodating cavity 201 of the shell 200, and the electrolyte injected from the liquid injection hole 11 can flow into the accommodating cavity 201 after flowing through the liquid storage cavity 21; the setting of the liquid storage cavity 21 can increase the electrolyte storage space, and when the shell is squeezed over a large area, the refluxed electrolyte can The electrolyte can be temporarily stored in the liquid storage chamber 21 to prevent the electrolyte from spraying out from the injection port, thereby improving the spraying phenomenon, reducing electrolyte pollution, and ensuring the personal safety of production technicians; at the same time, a liquid hole 23 is provided on the side 22 of the insulating seat 2, so that the liquid storage chamber 21 is connected with the accommodating chamber 201. On the one hand, it can ensure that the electrolyte injected from the injection hole 11 can flow smoothly into the accommodating chamber 201, and on the other hand, it can prevent the electrolyte from directly hitting the core package 300 in the accommodating chamber 201 during injection, thereby buffering the injection pressure and avoiding the core package 300 structure from being damaged due to excessive electrolyte flow rate during injection, thereby improving the production yield of the battery 1000.

[0055] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A cover plate assembly (100), characterized in that: include: A top cover plate (1), the top cover plate (1) being used to cover a housing (200) of a battery (1000), the top cover plate (1) being provided with a liquid injection hole (11); and, An insulating seat (2), the insulating seat (2) being arranged on a side of the top cover plate (1) facing the shell (200), a sealed liquid storage cavity (21) being formed between the insulating seat (2) and the top cover plate (1), the liquid storage cavity (21) corresponding to the position of the liquid injection hole (11) and being in communication with each other, a liquid passage hole (23) being provided on a side surface (22) of the insulating seat (2) opposite to a side wall (21b) of the shell (200), the liquid passage hole (23) being in communication with the liquid storage cavity (21) so as to guide the electrolyte flowing through the liquid storage cavity (21) into the shell (200).

2. The cover plate assembly (100) according to claim 1, characterized in that: A partition plate (3) is protrudingly provided on the bottom wall (21a) of the liquid storage chamber (21) opposite to the top cover plate (1), and the partition plate (3) divides the liquid storage chamber (21) into two independent chambers (211); The injection hole (11) is communicated with the two cavities (211) respectively; The liquid passage holes (23) are respectively connected to the two cavities (211).

3. The cover plate assembly (100) according to claim 2, characterized in that: The partition plate (3) is spaced apart from the top cover plate (1), and a liquid gap (24) is provided between two surfaces opposite to each other of the partition plate (3) and the top cover plate (1), and the liquid gap (24) is respectively connected to the liquid injection hole (11) and the two cavities (211).

4. The cover plate assembly (100) according to claim 1, characterized in that: A drainage slope (212) is provided on the bottom wall (21a) of the liquid storage chamber (21) opposite to the top cover plate (1); in a direction close to the liquid passage hole (23), the drainage slope (212) is inclined in a direction away from the top cover plate (1).

5. The cover plate assembly (100) according to claim 4, characterized in that: A transition camber (213) is provided at the connection between the drainage inclined surface (212) and the side wall (21b) of the liquid storage chamber (21).

6. The cover plate assembly (100) according to claim 4, characterized in that: The included angle θ between the drainage slope (212) and the top cover plate (1) is set to 0° to 3°.

7. The cover plate assembly (100) according to any one of claims 2 to 6, characterized in that: The top cover plate (1) has a first end (1a) and a second end (1b) opposite to each other, and the top cover plate (1) is provided with the injection hole (11) at a position close to the first end (1a); The insulating seat (2) comprises an insulating plate (25), wherein the insulating plate (25) is partially recessed at a position adjacent to the first end (1a) to form a first recess (251), an opening (2511) of the first recess (251) is arranged toward the top cover plate (1) to enclose together with the top cover plate (1) to form the liquid storage cavity (21), and the liquid passage hole (23) is arranged on a side portion (2512) of the first recess (251) close to the first end (1a).

8. The cover plate assembly (100) according to claim 7, characterized in that: A first annular groove (252) is provided on the periphery of the opening (2511) of the first recess (251); A second annular groove (12) is correspondingly formed on the top cover plate (1), and the second annular groove (12) is arranged opposite to the first annular groove (252) and has a matching shape; The cover plate assembly (100) further comprises a sealing ring (4), wherein the sealing ring (4) is arranged in the first annular groove (252) and the second annular groove (12).

9. The cover plate assembly (100) according to claim 7, characterized in that: The insulating plate (25) is partially recessed at a position adjacent to the second end (1b) to form a second recess (253); an opening (2531) of the second recess (253) is arranged toward the top cover plate (1); and the second recess (253) is used to be placed in the shell (200) and to fix the core package (300) in the shell (200).

10. A battery (1000), characterized in that: include: A housing (200), wherein the housing (200) has a receiving cavity (201) with an opening (201a) on one side; The cover plate assembly (100) according to any one of claims 1 to 9, wherein the cover plate assembly (100) covers the opening (201a) of the accommodating cavity (201), and the liquid hole (23) on the lower insulating seat (2) of the cover plate assembly (100) is connected to the accommodating cavity (201) for injecting electrolyte into the accommodating cavity (201); as well as, A core package (300), wherein the core package (300) is arranged in the accommodating cavity (201).

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