Cover plate protective film

Abstract

The utility model discloses a cover plate protective film and a single battery, and belongs to the technical field of battery preparation, the cover plate protective film is used for being arranged on a cover plate assembly of the single battery, the cover plate assembly comprises a cover plate body, and a pole and an anti-explosion valve which are connected to the cover plate body, and the cover plate body is provided with a liquid injection port; the cover plate protective film comprises a film body and a first covering part. The film body is used for covering at least part of the cover plate body, and an avoiding hole is formed in the film body and used for being arranged corresponding to the liquid injection opening. The first covering member is connected to the film body and is used for covering the pole. According to the arrangement, the electrolyte can be prevented from overflowing to the cover plate assembly to cause corrosion in the processes of liquid injection, formation and the like, so that the durability of the cover plate assembly can be improved. And the arrangement of the cover plate protective film can also prevent the electrolyte from remaining near the liquid injection opening to form crystals, so that the welding yield of the sealing of the liquid injection opening is improved. Besides, the cover plate protective film can provide a protection effect, so that the cover plate assembly is prevented from being abraded after being scraped or collided, and the safety and the reliability of the battery are improved.

Description

Technical Field

[0001] This application belongs to the technical field of battery preparation, and particularly relates to a cover protection film. Background Art

[0002] During processes such as liquid injection and formation of the battery, it is easy for the electrolyte to overflow onto the surface of the cover plate. The electrolyte will cause certain corrosion when it overflows onto the cover plate, terminal post or plastic. The crystallization of the electrolyte remaining near the liquid injection hole will reduce the welding yield of the liquid injection hole seal, affecting the quality of the battery. Utility Model Content

[0003] Utility Model Objective: The embodiments of this application provide a cover protection film, aiming to solve the technical problem that the electrolyte easily overflows onto the surface of the cover plate during processes such as liquid injection and formation of the battery.

[0004] Technical Solution: The embodiments of this application provide a cover protection film, which is used to be arranged on the cover plate assembly of a single battery. The cover plate assembly includes a cover plate body, a terminal post and an explosion-proof valve connected to the cover plate body, and the cover plate body is provided with a liquid injection port; the cover protection film includes:

[0005] A film body, which is used to cover at least part of the cover plate body. The film body is provided with an avoidance hole, and the avoidance hole is used to be correspondingly arranged with the liquid injection port;

[0006] A first covering member, which is connected to the film body and is used to cover the terminal post.

[0007] In some embodiments, the first covering member is used to cover the side of the terminal post away from the cover plate body;

[0008] The film body includes a diversion part, and the diversion part is used to connect the first covering member and the cover plate body. The diversion part is an inclined surface, which is used to divert the electrolyte to the liquid injection port.

[0009] In some embodiments, the cover protection film includes a plurality of first covering members, and each first covering member is used to cover at least one terminal post;

[0010] The film body is located between two adjacent first covering members. The film body includes a plurality of diversion parts, each diversion part is connected to a first covering member, at least one diversion part is used to cover the explosion-proof valve, and two adjacent diversion parts are connected to each other. The avoidance hole is formed between two adjacent diversion parts.

[0011] In some embodiments, the cover protection film further includes a receiving part, the receiving part is connected to the film body, and the receiving part is provided with a receiving cavity for receiving the electrolyte of the single battery. The receiving cavity is communicated with the avoidance hole.

[0012] In some embodiments, the film body is provided with a through hole for passing through the terminal post;

[0013] The first covering member includes a main body portion and an edge portion. The main body portion is used to cover one side of the terminal away from the cover body, and the edge portion is disposed around the through hole and is used to cover the circumferential side wall of the terminal. The edge portion is connected to the main body portion and the film body respectively.

[0014] In some embodiments, a first weak portion is provided between the first covering member and the film body. The first weak portion is configured to break when subjected to a preset tensile force, so that the first covering member and the film body are separated.

[0015] In some embodiments, the cover protection film further includes:

[0016] A second covering member, connected to the film body and used to cover the explosion-proof valve.

[0017] In some embodiments, a second weak portion is provided between the second covering member and the film body. The second weak portion is configured to break when subjected to a preset tensile force, so that the second covering member and the film body are separated.

[0018] In some embodiments, the cover protection film includes a first adhesive layer, which is located between the film body and the cover body and is used to connect the film body and the cover body.

[0019] In some embodiments, the cover protection film includes a second adhesive layer, which is located between the first covering member and the terminal and is used to connect the first covering member and the terminal.

[0020] Beneficial effects: The embodiment of the present application provides a cover protection film, which is used to be disposed on the cover assembly of a single cell. The cover assembly includes a cover body, a terminal and an explosion-proof valve connected to the cover body, and the cover body is provided with a liquid injection port. The cover protection film includes a film body and a first covering member. The film body is used to cover at least a part of the cover body, and the film body is provided with an avoidance hole, which is used to be correspondingly disposed with the liquid injection port. The first covering member is connected to the film body and is used to cover the terminal. By providing the film body and the first covering member, it is possible to prevent the electrolyte from overflowing onto the cover assembly during processes such as liquid injection and formation, thereby causing corrosion, and thus improving the durability of the cover assembly and the welding yield of the liquid injection port seal. In addition, the cover protection film can provide a protection function, avoid abrasion caused by scratching or collision of the cover assembly, and improve the safety and reliability of the battery. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1It is a schematic structural diagram of a single battery with a cover protective film according to the first embodiment of the present application;

[0023] Figure 2 It is an exploded view of a single battery with a cover protective film according to the first embodiment of the present application;

[0024] Figure 3 It is a front view of the first cover protective film according to the embodiment of the present application;

[0025] Figure 4 It is a front view of the second cover protective film according to the embodiment of the present application;

[0026] Figure 5 It is a top view of the first cover protective film according to the embodiment of the present application;

[0027] Figure 6 It is a schematic structural diagram of a single battery with a cover protective film according to the second embodiment of the present application;

[0028] Figure 7 It is a front view of the third cover protective film according to the embodiment of the present application;

[0029] Figure 8 It is a top view of the third cover protective film according to the embodiment of the present application;

[0030] Figure 9 It is a schematic structural diagram of a single battery with a cover protective film according to the third embodiment of the present application;

[0031] Figure 10 It is a bottom view of the fourth cover protective film according to the embodiment of the present application;

[0032] Figure 11 It is a schematic structural diagram of a single battery with a cover protective film according to the fourth embodiment of the present application;

[0033] Figure 12 It is a bottom view of the fifth cover protective film according to the embodiment of the present application.

[0034] Reference numerals: 1, film body; 2, cover assembly; 3, first covering member; 4, receiving portion; 5, first weak portion; 6, second covering member; 7, second weak portion; 8, first adhesive layer; 9, second adhesive layer; 10, avoidance hole; 11, diversion portion; 12, through hole; 20, cover body; 21, pole; 22, explosion-proof valve; 30, main body portion; 31, edge portion; 40, receiving cavity; 200, liquid injection port; 210, side wall. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0036] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality" is two or more, and at least one means it can be one, two or more, unless otherwise specifically defined.

[0037] During processes such as liquid injection and formation of the battery, it is easy for the electrolyte to overflow onto the surface of the cover plate. The electrolyte will cause certain corrosion when it overflows onto the cover plate, pole column or plastic. The crystallization of the electrolyte remaining near the liquid injection hole will reduce the sealing welding yield and affect the quality of the battery.

[0038] In view of this, the embodiment of the present application provides a cover plate protective film for being arranged on the cover plate assembly of a single battery. The cover plate assembly includes a cover plate body, a pole column and an explosion-proof valve connected to the cover plate body, and the cover plate body is provided with a liquid injection port; the cover plate protective film includes a film body and a first covering member. The film body is used to cover at least part of the cover plate body, and the film body is provided with an avoidance hole for corresponding to the liquid injection port. The first covering member is connected to the film body and is used to cover the pole column. By arranging the film body and the first covering member, it is possible to prevent the electrolyte from overflowing onto the cover plate assembly during processes such as liquid injection and formation, causing corrosion, thereby improving the durability of the cover plate assembly and the welding yield of the liquid injection port sealing. In addition, the cover plate protective film can provide a protective effect, avoiding abrasion caused by scratching or collision of the cover plate assembly, and improving the safety and reliability of the battery.

[0039] Next, the cover plate protective film of the present application will be described in detail in conjunction with the drawings. Without conflict, the features in the following embodiments and implementation manners can be combined with each other.

[0040] Figure 1 is a schematic structural view of the first single cell provided with a cover protective film according to an embodiment of the present application; Figure 2 is an explosion view of the first single cell provided with a cover protective film according to an embodiment of the present application; Figure 3 is a front view of the first cover protective film according to an embodiment of the present application; Figure 4 is a front view of the second cover protective film according to an embodiment of the present application; Figure 5 is a top view of the first cover protective film according to an embodiment of the present application; Figure 6 is a schematic structural view of the second single cell provided with a cover protective film according to an embodiment of the present application; Figure 7 is a front view of the third cover protective film according to an embodiment of the present application; Figure 8 is a top view of the third cover protective film according to an embodiment of the present application; Figure 9 is a schematic structural view of the third single cell provided with a cover protective film according to an embodiment of the present application; Figure 10 is a bottom view of the fourth cover protective film according to an embodiment of the present application; Figure 11 is a schematic structural view of the fourth single cell provided with a cover protective film according to an embodiment of the present application; Figure 12 is a bottom view of the fifth cover protective film according to an embodiment of the present application.

[0041] Reference Figures 1 to 12 , an embodiment of the present application provides a cover protective film for being arranged on a cover assembly 2 of a single cell. The cover assembly 2 includes a cover body 20, a pole column 21 and an explosion-proof valve 22 connected to the cover body 20. The cover body 20 is provided with a liquid injection port 200. The cover protective film includes a film body 1 and a first covering member 3. The film body 1 is used for covering at least a part of the cover body 20. The film body 1 is provided with an avoidance hole 10 which is used for corresponding to the liquid injection port 200. The overflowing electrolyte flows back into the single cell through the avoidance hole 10 communicated with the liquid injection port 200 on the film body 1. The first covering member 3 is connected to the film body 1 and is used for covering the pole column 21, which can avoid battery failure or invalidation caused by external force collision or scratching of the pole column 21. By arranging the film body 1 and the first covering member 3, it is possible to avoid the electrolyte from overflowing onto the cover assembly 2 of the single cell during processes such as liquid injection and formation, thereby causing corrosion, and thus the durability of the cover assembly 2 can be improved. The arrangement of the cover protective film can also avoid the electrolyte from remaining near the liquid injection port 200 to form crystals, thereby improving the welding yield of the sealing of the liquid injection port 200. In addition, the cover protective film can provide a protection effect, avoid abrasion caused by scratching or collision of the cover assembly 2, and improve the safety and reliability of the battery.

[0042] In some embodiments, the membrane body 1 is provided with a through hole 12 for passing through the pole post 21. The pole post 21 passes through the through hole 12 so that the membrane body 1 covers the surface of the cover plate body 20. The first covering member 3 includes a main body portion 30 and an edge portion 31. The main body portion 30 is used to cover the side of the pole post 21 away from the cover plate body 20. The edge portion 31 is disposed around the through hole 12 and is used to cover the circumferential side wall 210 of the pole post 21. The edge portion 31 is connected to the main body portion 30 and the membrane body 1 respectively. By providing the main body portion 30 and the edge portion 31, the part of the pole post 21 protruding from the cover plate body 20 can be covered, thereby preventing the overflowing electrolyte from contacting the pole post 21 and causing corrosion on the surface of the pole post 21, and also avoiding the abrasion caused by scratching or collision of the pole post 21, improving the safety and reliability of the battery.

[0043] In some embodiments, the cover plate protective film further includes a second covering member 6, which is connected to the membrane body 1 and is used to cover the explosion-proof valve 22. The explosion-proof valve 22 is usually configured to be damaged when impacted by a preset pressure. By providing the second covering member 6, the overflowing electrolyte can be prevented from flowing onto the explosion-proof valve 22, causing corrosion on the surface of the explosion-proof valve 22. The side of the second covering member 6 away from the cover plate body 20 is spaced from the explosion-proof valve 22, so as to avoid contacting the explosion-proof valve 22 and causing damage to the explosion-proof valve 22, ensuring that the explosion-proof valve 22 can work properly when needed.

[0044] In some embodiments, the first covering member 3, the second covering member 6 and the membrane body 1 are integrally provided. After the battery completes the liquid injection and formation processes and before the battery is shipped, the first covering member 3, the second covering member 6 and the membrane body 1 covering the cover plate assembly 2 are torn off, so as to play a protective role for the cover plate assembly 2 during the liquid injection and formation processes. Separating the integrally provided first covering member 3, the second covering member 6 and the membrane body 1 from the cover plate assembly 2 before the battery is shipped can save the process of wiping the surface of the cover plate assembly 2 and improve the efficiency of battery preparation.

[0045] In some other embodiments, a first weak portion 5 is provided between the first covering member 3 and the membrane body 1. The first weak portion 5 is configured to break when subjected to a preset pulling force, so that the first covering member 3 and the membrane body 1 are separated, as Figure 1 and Figure 2 shown. The first weak portion 5 is disposed between the edge portion 31 and the membrane body 1. In the embodiments of the present application, the first weak portion 5 can be a notch or a virtual knife line, which is convenient for separating the first covering member 3 and the membrane body 1 when subjected to an external force. Tearing off the first covering member 3 before the battery is shipped is convenient for subsequent welding. The membrane body 1 remaining on the surface of the cover plate body 20 can play a protective role for the cover plate body 20, avoiding abrasion caused by scratching or collision, and improving the safety and reliability of the battery. In addition, the membrane body 1 can be combined with the protective film of the housing of the single battery to provide insulation protection for the battery.

[0046] In some embodiments, a second weak part 7 is provided between the second cover 6 and the film body 1. The second weak part 7 is configured to break when a preset tensile force is applied, so that the second cover 6 and the film body 1 are separated, as Figure 1 and Figure 2 shown. In the embodiments of the present application, the second weak part 7 can be a notch or a virtual cutting line, which is convenient for separating the second cover 6 and the film body 1 when an external force is applied. Before the battery is shipped, the second cover 6 is torn off, which is convenient for the explosion-proof valve 22 to work properly when needed. The film body 1 remaining on the surface of the cover plate body 20 can protect the cover plate body 20, avoid abrasion caused by scratching or collision, and improve the safety and reliability of the battery. In addition, the film body 1 can be combined with the protective film of the cover plate body 20 to provide insulation protection for the battery.

[0047] In Figure 8 the embodiment shown, the cover plate protective film includes a first adhesive layer 8. The first adhesive layer 8 is located between the film body 1 and the cover plate body 20 and is used to connect the film body 1 and the cover plate body 20. The film body 1 and the cover plate body 20 can be fixedly attached through the first adhesive layer 8, avoiding the displacement of the cover plate protective film and affecting the protection effect. In Figure 4 the embodiment shown, the setting of the first adhesive layer 8 is cancelled for the cover plate protective film, and the first cover 3 is used to fix the pole 21 by interference fit, so that the film body 1 connected to the first cover 3 can be positioned, avoiding the displacement of the cover plate protective film and affecting the protection effect. In the embodiments of the present application, it can be determined whether to use the first adhesive layer 8 to fixedly attach the film body 1 and the cover plate body 20 according to the height of the pole 21 protruding from the cover plate body 20. Specifically, when the height of the pole 21 protruding from the cover plate body 20 is relatively low, the first adhesive layer 8 can be used to fixedly attach the film body 1 and the cover plate body 20. When the height of the pole 21 protruding from the cover plate body 20 is relatively high, the first cover 3 can be used to fix the pole 21 by interference fit. The present application does not limit this.

[0048] In Figures 6 to 8In the illustrated embodiment, the first covering member 3 is used to cover the side of the pole post 21 away from the cover plate body 20. The film body 1 includes a diversion portion 11 which is used to connect the first covering member 3 and the cover plate body 20. The diversion portion 11 is an inclined surface for diverting the electrolyte to the liquid injection port 200. Specifically, the cover plate protective film includes a plurality of first covering members 3, and each first covering member 3 covers at least one pole post 21. The film body 1 is located between two adjacent first covering members 3. The film body 1 includes a plurality of diversion portions 11, each diversion portion 11 is connected to a first covering member 3, and two adjacent diversion portions 11 are connected to each other. An avoidance hole 10 is formed between two adjacent diversion portions 11. For the cover plate assembly 2 with the liquid injection port 200 located between two pole posts 21, by utilizing the characteristic that there is a height difference between the upper surface of the pole post 21 and the cover plate body 20, the diversion portion 11 connecting the first covering member 3 on the pole post 21 and the outer periphery of the liquid injection port 200 forms an inclined surface, so that the overflowing electrolyte can be diverted to the avoidance hole 10 and flow back into the single cell through the liquid injection port 200. With such a setting, the cover plate protective film can achieve a protective effect without completely covering the entire cover plate assembly 2, preventing the overflowing electrolyte from contacting the pole post 21 and causing corrosion on the surface of the pole post 21, preventing the electrolyte from remaining near the liquid injection port 200, and improving the welding yield of sealing the liquid injection port 200. In addition, the first covering member 3 provided on the upper surface of the pole post 21 can avoid abrasion caused by the pole post 21 being scratched or collided, improving the safety and reliability of the battery.

[0049] In Figure 7 the illustrated embodiment, the cover plate protective film includes a second adhesive layer 9 which is located between the first covering member 3 and the pole post 21 and is used to connect the first covering member 3 and the pole post 21. By providing the second adhesive layer 9, the first covering member 3 and the pole post 21 can be adhered and fixed, so as to partially limit the film body 1 connected to the first covering member 3 and avoid the displacement of the film body 1 from affecting the protective effect.

[0050] In Figures 9 to 12 the illustrated embodiment, the cover plate protective film further includes a receiving portion 4 which is connected to the film body 1. The receiving portion 4 is provided with a receiving cavity 40 for receiving the electrolyte of the single cell, and the receiving cavity 40 is communicated with the avoidance hole 10. The receiving portion 4 can be in a cylindrical shape, a square shape, etc., and the present application does not limit this. By injecting liquid into the liquid injection port 200 through the receiving cavity 40, the risk of liquid leakage can be reduced, and the cover plate assembly 2 can be prevented from being corroded by the electrolyte. In addition, the cover plate protective film includes a first covering member 3 which is connected to the film body 1 and covers the pole post 21, and can avoid battery failure or malfunction caused by the pole post 21 being collided or scratched by an external force. Figure 9 and Figure 11 In order to show the structure of the film body 1, the first covering member 3 is hidden, and the structure of the first covering member 3 can be referred to Figure 2 as shown.

[0051] In Figure 10 and Figure 12 In the embodiment shown, the cover protective film includes a first adhesive layer 8, which is located between the film body 1 and the cover body 20 and is used to connect the film body 1 and the cover body 20. The film body 1 and the cover body 20 can be adhered and fixed through the first adhesive layer 8, so that the accommodating portion 4 connected to the film body 1 can be fixed.

[0052] In some other embodiments, the first adhesive layer 8 of the cover protective film can be cancelled, and the first covering member 3 is used to be fixed by interference fit with the pole 21, so that the film body 1 connected to the first covering member 3 can be positioned, and the displacement of the cover protective film is avoided from affecting the protection effect. In the embodiment of the present application, it can be determined whether to use the first adhesive layer 8 to adhere and fix the film body 1 and the cover body 20 according to the height of the pole 21 protruding from the cover body 20. Specifically, when the height of the pole 21 protruding from the cover body 20 is relatively low, the first adhesive layer 8 can be used to adhere and fix the film body 1 and the cover body 20. When the height of the pole 21 protruding from the cover body 20 is relatively high, the first covering member 3 can be used to be fixed by interference fit with the pole 21, and the present application does not limit this.

[0053] In the above embodiments, the descriptions of the respective embodiments have their own focuses. For the parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0054] The above has introduced in detail a cover protective film provided by the embodiments of the present application, and specific examples are used to elaborate the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A cover plate protective film, used to be arranged on the cover plate assembly of a single battery, the cover plate assembly comprises a cover plate body and a pole and an explosion-proof valve connected to the cover plate body, the cover plate body is provided with a liquid injection port; characterized in that: The cover plate protective film comprises: A membrane body, used to cover at least a portion of the cover plate body, the membrane body is provided with an avoidance hole, and the avoidance hole is used to be arranged corresponding to the liquid injection port; The first covering member is connected to the membrane body and is used to cover the pole.

2. The cover plate protective film according to claim 1, characterized in that: The first covering member is used to cover a side of the pole away from the cover plate body; The membrane body comprises a guide portion, the guide portion is used to connect the first cover and the cover plate body, and the guide portion is an inclined surface, which is used to guide the electrolyte to the liquid injection port.

3. The cover plate protective film according to claim 2, characterized in that: The cover plate protective film comprises a plurality of the first covering members, each of the first covering members being used to cover at least one of the poles; The membrane body is located between two adjacent first covering members, and the membrane body includes a plurality of guide portions, each of which is connected to one of the first covering members, at least one guide portion is used to cover the explosion-proof valve, two adjacent guide portions are connected to each other, and the avoidance hole is formed between two adjacent guide portions.

4. The cover plate protective film according to claim 1, characterized in that: The cover plate protective film further comprises a receiving portion, the receiving portion is connected to the film body, the receiving portion is provided with a receiving cavity for receiving the electrolyte of the single cell, and the receiving cavity is communicated with the avoidance hole.

5. The cover plate protective film according to claim 1, characterized in that: The membrane body is provided with a through hole for penetrating the pole; The first covering member includes a main body and an edge portion, the main body is used to cover the side of the pole away from the cover body, the edge is arranged around the through hole and is used to cover the circumferential side wall of the pole, and the edge is respectively connected to the main body and the membrane body.

6. The cover plate protective film according to claim 1, characterized in that: A first weak portion is provided between the first covering member and the membrane body, and the first weak portion is configured to break when subjected to a preset tensile force, so that the first covering member and the membrane body are separated.

7. The cover plate protective film according to claim 1, characterized in that: The cover plate protective film also includes: The second covering member is connected to the membrane body and is used to cover the explosion-proof valve.

8. The cover plate protective film according to claim 7, characterized in that: A second weak portion is provided between the second covering member and the membrane body, and the second weak portion is configured to break when subjected to a preset tensile force, so that the second covering member and the membrane body are separated.

9. The cover plate protective film according to claim 1, characterized in that: The cover plate protective film includes a first adhesive layer, which is located between the film body and the cover plate body and is used to connect the film body and the cover plate body.

10. The cover plate protective film according to claim 2, characterized in that: The cover plate protective film includes a second adhesive layer, which is located between the first cover member and the pole and is used to connect the first cover member and the pole.

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