Lower plastic structure of battery cover plate, battery cover plate and battery

Abstract

The utility model relates to a lower plastic structure of a battery cover plate, which is used for being mounted on the back of a cover plate body, and an anti-explosion valve reinforcing rib is formed in the middle of the cover plate body. The lower plastic structure comprises two insulating protection sheets, the two insulating protection sheets are respectively formed on two sides of the explosion-proof valve reinforcing rib, and the two insulating protection sheets can be turned over towards the cover plate body in opposite directions and can cover the surfaces of the tabs. The lower plastic structure of the battery cover plate is simple and ingenious, the two insulating protection sheets with simple structures are arranged, an additional rubberizing process is not needed, and the insulating protection sheets completely cover the surfaces of the tabs, so that the damage to the tabs cannot be caused or can be reduced, the use performance of the battery is ensured, and the manufacturing cost is reduced. The battery cover plate comprises the lower plastic structure of the battery cover plate, and also has the advantages of low cost and excellent performance. The battery comprises the battery cover plate and also has the advantages of low cost and excellent performance.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery manufacturing, in particular to a plastic structure under a battery cover, a battery cover and a battery. Background Art

[0002] Lithium batteries are a type of chemical power source that uses lithium metal or lithium ions as electrode materials. They have the characteristics of high energy density, long life, low self-discharge rate, and fast charging capability. Lithium batteries are widely used in many fields such as portable electronic devices, electric vehicles, and energy storage systems.

[0003] At present, the internal electrical connection of the square lithium battery roll core is usually achieved by ultrasonic welding of the pole ear and the connecting piece, and laser welding of the connecting piece and the top cover pole. During the welding process, welding points may be generated between the pole ear and the connecting piece. If the height of the pole ear does not meet the requirements, it may cause short circuit and other phenomena. Therefore, the industry usually adopts the internal insulation design by applying tape to the two welding positions.

[0004] When using glue sticking to design internal insulation, the following technical problems often occur: the glue sticking process needs to be performed after ultrasonic welding and laser welding respectively, and the corresponding glue sticking mechanism needs to be set up during the equipment planning process, which often takes up production line layout space and increases equipment costs; and glue sticking requires cutting and contour pressing tooling, and problems such as glue sticking not meeting precision requirements or damaging the pole ears during pressing often occur.

[0005] This section merely provides background information related to the present disclosure and is not necessarily prior art. Utility Model Content

[0006] In order to overcome the defects in the above-mentioned prior art, the first utility model object of the present invention is to provide a plastic structure under the battery cover. The lower plastic structure is simple and clever, easy to operate, and does not require an additional gluing process. It reduces the production cost while ensuring the performance of the battery, enhances the user experience, and is conducive to the promotion and application of the above-mentioned plastic structure under the battery cover in the field of battery manufacturing technology. The second utility model object of the present invention is to provide a battery cover. The battery cover, by applying the above-mentioned plastic structure under the battery cover, also has the advantages of low manufacturing cost and excellent performance. The third utility model object of the present invention is to provide a battery, which uses the above-mentioned battery cover and has the same advantages as the battery cover.

[0007] The above-mentioned plastic structure under the battery cover, the battery cover and the battery are technically related to each other and belong to the same utility model concept.

[0008] In order to achieve the above-mentioned first utility model purpose, the utility model adopts the following technical scheme: a plastic structure under the battery cover, which is used to be installed on the back of the cover body, and an explosion-proof valve reinforcement rib is formed at the middle position of the cover body; the lower plastic structure includes two insulating protection sheets, and the two insulating protection sheets are respectively formed on both sides of the explosion-proof valve reinforcement rib, and the two insulating protection sheets can be folded in opposite directions toward the cover body and can cover the surface of the pole ear.

[0009] As a preferred solution of the utility model, the insulating protection sheet includes a protection sheet body, a protection sheet extension portion and a protection sheet fixing portion. The protection sheet body, the protection sheet extension portion and the protection sheet fixing portion are integrally formed and are arranged with decreasing widths.

[0010] As a preferred solution of the utility model, a hook portion in the shape of a hook is formed at the fixing portion of the protection sheet, and correspondingly, a buckling groove is formed on the cover body, and the hook portion is used to buckle in the buckling groove.

[0011] As a preferred solution of the utility model, a space is left between the insulating protection sheet and the surface of the cover body.

[0012] As a preferred solution of the utility model, a bending line is formed at the bending portion of the insulating protection sheet.

[0013] As a preferred solution of the utility model, the thickness of the insulating protection sheet is 0.05 mm to 1 mm.

[0014] As a preferred solution of the utility model, the insulating protection sheet is a plastic sheet.

[0015] As a preferred solution of the utility model, the insulating protection sheet and the explosion-proof valve reinforcement rib are integrally injection molded.

[0016] Compared with the prior art, the beneficial effects of the utility model are: a plastic structure under the battery cover in the utility model is simple and ingenious, and by setting two insulating protection sheets with simple structures, there is no need to set up an additional gluing process, and the insulating protection sheets completely cover the surface of the pole ear, which will not cause or reduce damage to the pole ear, thereby ensuring the performance of the battery and reducing the production cost.

[0017] Furthermore, the utility model forms a hook-shaped hook portion at the fixing portion of the protective sheet, and correspondingly forms a buckle groove at the cover body, and buckles the hook portion in the buckle groove, thereby ensuring the uniqueness of the position of the insulating protective sheet during use, and thus the fixity of its position.

[0018] In order to achieve the above second utility model purpose, the utility model adopts the following technical solution: a battery cover, including the above plastic structure under the battery cover.

[0019] Compared with the prior art, the beneficial effect of the present invention is that the battery cover of the present invention, by applying the above-mentioned plastic structure under the battery cover, also has the advantages of low cost and excellent performance.

[0020] In order to achieve the third utility model object mentioned above, the utility model adopts the following technical solution: a battery, including the above-mentioned battery cover.

[0021] Compared with the prior art, the beneficial effect of the utility model is that the battery of the utility model has the same advantages as the battery cover by applying the above-mentioned battery cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of a battery cover in an embodiment of the utility model;

[0023] Figure 2 This is a schematic diagram of the structure of a battery cover in an embodiment of the utility model;

[0024] Figure 3 yes Figure 2 Structural cross-section view at AA in the middle;

[0025] Figure 4 yes Figure 3 A schematic diagram of the structure enlarged at B in the middle;

[0026] Figure 5 yes Figure 3 A schematic diagram of the structure enlarged at C in the middle;

[0027] Figure 6 This is a schematic diagram of the state of the insulating protection sheet after being bent in the embodiment of the utility model;

[0028] Figure 7 yes Figure 6 Enlarged schematic diagram of the structure at D in the middle.

[0029] Figure numerals: 1. Cover plate body; 2. Explosion-proof valve reinforcement rib; 3. Insulation protection sheet; 3-1. Protection sheet body; 3-2. Protection sheet extension portion; 3-3. Protection sheet fixing portion; 3-4. Hook portion; 3-5. Bending line; 4. Ear; 5. Buckle groove. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is described below by specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0031] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0032] The embodiments of the utility model are described in detail below with reference to the accompanying drawings.

[0033] In the prior art, the gluing process needs to be performed after ultrasonic welding and laser welding, and corresponding gluing mechanisms need to be additionally set up during the equipment planning process, which often takes up production line layout space and increases equipment costs. In addition, gluing requires cutting and profiling block tooling, and problems such as the gluing failing to meet precision requirements or damaging the tabs during gluing often occur.

[0034] Embodiment 1: In order to solve the above technical problems, Figures 1 to 7 As shown, a plastic structure under the battery cover is used to be installed on the back of the cover body 1. In order to improve the mechanical strength of the battery cover so that it can withstand various forces that the battery may encounter during use, such as pressure, impact force, etc., and in this embodiment, in order to facilitate the subsequent setting of the insulating protection sheet 3, an explosion-proof valve reinforcement rib 2 is formed at the middle position of the above-mentioned cover body 1. The battery may generate gas during the charging and discharging process, resulting in changes in internal pressure. The explosion-proof valve reinforcement rib 2 can also prevent the battery cover from deforming under pressure and maintain the sealing and integrity of the battery. The explosion-proof valve reinforcement rib 2 is arranged along the width direction of the above-mentioned cover body 1. The lower plastic structure in this embodiment is mainly two insulating protection sheets 3 arranged at a distance. Specifically, the two insulating protection sheets 3 are respectively formed on both sides of the above-mentioned explosion-proof valve reinforcement rib 2. The two insulating protection sheets 3 can be folded and arranged, and the two are folded in opposite directions toward the above-mentioned cover body 1, so that they can cover the surface of the pole ear 4, thereby avoiding the problem that the glue cannot meet the precision requirements or the pole ear 4 is damaged during the glue pressing.

[0035] The explosion-proof valve reinforcement rib 2 and the insulating protection sheet 3 are completed by integral injection molding. The integral molding can ensure that the connection between the explosion-proof valve reinforcement rib 2 and the insulating protection sheet 3 is more firm, reduce the structural instability caused by improper assembly, and thus ensure the performance of the battery. The integral molding of the insulating protection sheet 3 can also ensure good insulation between the explosion-proof valve reinforcement rib 2 and other parts of the battery to prevent electrical short circuit or leakage.

[0036] In order to adapt to the structure of the back of the cover body 1, the above-mentioned insulating protective sheet 3 in this embodiment includes a protective sheet body 3-1, a protective sheet extension 3-2 and a protective sheet fixing portion 3-3. The above-mentioned protective sheet body 3-1, the above-mentioned protective sheet extension 3-2 and the above-mentioned protective sheet fixing portion 3-3 are integrally formed and the width is set to decrease, so as to fit the structure of the back of the cover body 1, and avoid the volume of the above-mentioned insulating protective sheet 3 being too large or too small. If the volume of the insulating protective sheet 3 is too large, it will undoubtedly affect the installation of other battery components; if the volume of the insulating protective sheet 3 is too small, the insulation effect cannot be guaranteed. In this embodiment, by designing the insulating protective sheet 3 into a protective sheet body 3-1, a protective sheet extension 3-2 and a protective sheet fixing portion 3-3, the original tab glue and welding tape inside the battery cell can be replaced.

[0037] In order to further ensure the fixed position of the insulating protection sheet 3 during installation and use, a hook portion 3-4 in the shape of a hook is formed at the above-mentioned protective sheet fixing portion 3-3, and correspondingly, the above-mentioned cover body 1 is formed with a buckle groove 5, and the above-mentioned hook portion 3-4 is used to buckle in the above-mentioned buckle groove 5. Conversely, a hook portion can also be formed on the above-mentioned cover body 1, and a buckle groove can be formed at the above-mentioned protective sheet fixing portion 3-3, which can also achieve the fixed connection between the above-mentioned insulating protection sheet 3 and the cover body 1. When assembling the battery cover, the insulating protection sheet 3 is lifted by the pressing plate and the clamping claw, and then the connecting sheet and the battery winding core are assembled to complete the welding of the connecting sheet and the cover pole, and then the insulating protection sheet 3 is pressed down by the mechanism to fix the position of the insulating protection sheet 3. After the insulating protection sheet 3 is folded and fixed, it can be applied to the upper surface of the pole ear 4. The edge of the insulating protection sheet 3 can be used to press the pole ear 4 and assist in the shaping and folding of the pole ear 4. The insulating protective sheet 3 separates the electrical connection part from the winding core as a whole. The first extension section, i.e., the main body of the protective sheet 3-1, covers the entire width of the pole lug 4, which can effectively prevent the pole lug 4 from sagging due to problems such as insufficient storage space or excessive length. The insulating protective sheet 3 is used to solve the insulation failure problem caused by the insertion of the pole lug 4 and the winding core. The second extension section, i.e., the extension part 3-2 of the protective sheet, covers the lower surface area of ​​the pole column, which can effectively prevent the winding core or the root of the pole lug from micro-contacting with the metal parts, and ensure the stability of the current path.

[0038] The insulating protective sheet 3 and the surface of the cover body 1 are provided with a space, that is, after the insulating protective sheet 3 is bent and attached to the lower surface of the pole ear 4, there is a gap between the insulating protective sheet 3 and the surface of the cover body 1. The battery generates heat during the charging and discharging process, resulting in thermal expansion of the internal components. Leaving space can provide a buffer for the thermal expansion of the internal components of the battery and avoid structural damage due to thermal stress. Leaving space between the insulating protective sheet 3 and the cover body 1 can also enhance the insulation effect and prevent short circuits or leakage caused by contact. Gas may be generated inside the battery, and leaving space can also provide a certain space for the expansion of the gas, which helps to regulate the internal pressure of the battery.

[0039] The above-mentioned insulating protection sheet 3 is formed with a bending line 3-5 at the bending part. The bending line can be a tooth knife line, a through V-shaped, circular, square or other form of groove. The groove can exist on the front or back of the above-mentioned insulating protection sheet 3, which is not limited here. The main purpose is to reduce the difficulty of bending.

[0040] Thickness is one of the key factors affecting the performance of insulating materials. Appropriate thickness can ensure that the insulating protection sheet 3 provides sufficient electrical isolation to prevent short circuits inside or outside the battery. In this embodiment, the thickness of the insulating protection sheet 3 is 0.05mm to 1mm. If the thickness of the insulating protection sheet 3 is less than 0.05mm, on the one hand, the structural strength is low, and on the other hand, the insulation effect is difficult to ensure; if the thickness of the insulating protection sheet 3 is greater than 1mm, it affects the internal heat transfer of the battery and increases the space occupied. In this embodiment, the thickness of the insulating protection sheet 3 is designed to be 0.5mm, so that the insulating protection sheet 3 can have good electrical insulation performance and sufficient mechanical strength to protect the internal components of the battery from physical damage. The thickness of 0.5mm can also strike a balance between cost and performance, which can not only meet the performance requirements of the battery, but also control material costs.

[0041] The insulating protective sheet 3 is a plastic sheet. Plastic materials usually have good electrical insulation properties and can effectively prevent the flow of current, thereby protecting the internal circuit of the battery from external electromagnetic interference. Plastic materials are usually low in cost. Compared with metals or other materials, the use of plastic can reduce the production cost of the battery. The density of plastic materials is low, and the use of plastic sheets can reduce the weight of the battery, which is particularly important for applications such as portable devices and electric vehicles. Plastic materials can also provide a certain degree of mechanical strength and flexibility, which helps to protect the internal components of the battery from impact and vibration.

[0042] A plastic structure under a battery cover in this embodiment is simple and ingenious. By setting two insulating protection sheets 3 with simple structures, there is no need to set up an additional gluing process, and the insulating protection sheets completely cover the surface of the pole ear 4, which will not cause or reduce damage to the pole ear, thereby ensuring the performance of the battery and reducing the production cost.

[0043] Embodiment 2:

[0044] A battery cover, including a plastic structure under the battery cover in Example 1, also has the advantages of low cost and excellent performance.

[0045] Embodiment 3:

[0046] A battery, including the battery cover in Example 2, also has the advantages of low cost and excellent performance.

[0047] 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.

[0048] Although this article uses more of the following terms: 1, cover plate body; 2, explosion-proof valve reinforcement rib; 3, insulation protection sheet; 3-1, protection sheet body; 3-2, protection sheet extension; 3-3, protection sheet fixing part; 3-4, hook part; 3-5, bending line; 4, pole ear; 5, buckle groove, etc., it does not exclude the possibility of using other terms. 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. A plastic structure under a battery cover, characterized in that: The cover body (1) is used for installation on the back of the cover body (1), and an explosion-proof valve reinforcement rib (2) is formed at the middle position of the cover body (1); the lower plastic structure comprises two insulating protection sheets (3), and the two insulating protection sheets (3) are respectively formed on both sides of the explosion-proof valve reinforcement rib (2), and the two insulating protection sheets (3) can be folded in opposite directions toward the cover body (1) and can cover the surface of the pole ear (4).

2. The plastic structure under the battery cover according to claim 1, characterized in that: The insulating protection sheet (3) comprises a protection sheet main body (3-1), a protection sheet extension portion (3-2) and a protection sheet fixing portion (3-3); the protection sheet main body (3-1), the protection sheet extension portion (3-2) and the protection sheet fixing portion (3-3) are integrally formed and are arranged with decreasing widths.

3. The plastic structure under the battery cover according to claim 2, characterized in that: A hook portion (3-4) in the shape of a hook is formed at the fixing portion (3-3) of the protection sheet, and correspondingly, a buckling groove (5) is formed on the cover plate body (1), and the hook portion (3-4) is used to buckle in the buckling groove (5).

4. The plastic structure under the battery cover according to claim 2, characterized in that: A space is left between the insulating protection sheet (3) and the surface of the cover plate body (1).

5. The plastic structure under the battery cover according to claim 1, characterized in that: A bending line (3-5) is formed at the bending portion of the insulating protection sheet (3).

6. The plastic structure under the battery cover according to claim 1, characterized in that: The thickness of the insulating protection sheet (3) is 0.05 mm to 1 mm.

7. The plastic structure under the battery cover according to claim 1, characterized in that: The insulating protection sheet (3) is a plastic sheet.

8. The plastic structure under the battery cover according to claim 1, characterized in that: The insulating protection sheet (3) and the explosion-proof valve reinforcement rib (2) are integrally injection-molded.

9. A battery cover, characterized in that: It comprises a plastic structure under a battery cover as described in any one of claims 1 to 8.

10. A battery, characterized in that: Comprising the battery cover as claimed in claim 9.

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