Battery cover plate, battery monomer, battery and electric device
By designing a structure of overlapping vertical edges and side welding sealing connections on the lithium battery cover, the problems of poor welding and safety risks of sealed aluminum nails are solved, and higher sealing, structural strength and service life are achieved, reducing the cost of use.
Patent Information
- Application Number
- CN202421473364.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-26
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-06-26
AI Technical Summary
The sealed aluminum nail welding of existing lithium batteries has poor welding and safety risks, resulting in poor sealing, short service life and high cost of use.
The structural design of the battery cover plate is adopted, in which the top cover plate is equipped with overlapping vertical sides. The seal is connected by side welding and sealing by laser equipment. The weld position does not directly contact the internal space of the liquid injection hole, reducing welding defects and safety risks caused by electrolyte contamination.
It improves the sealing and structural strength of lithium batteries, extends the service life of the battery, reduces the cost of users, and enhances the promotion and application of batteries in the market.
Smart Images
Figure CN222802073U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lithium battery manufacturing, in particular to a battery cover plate, a battery monomer, a battery and an electrical device. Background Art
[0002] Lithium battery is a 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 portable electronic devices, electric vehicles, energy storage systems and other fields. The battery usually includes multiple battery cells, and multiple battery cells are connected in series or in series-parallel. Among them, the battery cell generally has a battery cover, that is, a battery top cover. The battery cover is provided with a liquid injection hole, and then a sealing aluminum nail is used to match the top cover liquid injection hole sink, and then a laser welding method is used for the final sealing. The joint form is often a butt-seam vertical matching welding. Common sealing aluminum nails are grooved and flat-headed. The grooved sealing aluminum nail has a structure that is conducive to stress release, and the welding crack yield of the flat-headed aluminum nail is improved.
[0003] However, due to the small size of the injection hole and high precision requirements for sealing aluminum nail welding, solidification microcracks often grow in the brittle temperature range of the weld due to heat effects when laser welding is used, which directly affects the long-term reliability of the lithium battery seal. In addition, since the industry currently uses vertical seam welding for welding lithium battery top covers and sealing aluminum nails, the welding joint is T-shaped. Since the weld pool cannot be filled into the deep weld in time, when the surface cracks solidify under the influence of welding heat, the internal brittle temperature zone has less liquid and more solid, and the strength is weakened after solidification and even cracks appear.
[0004] In order to ensure that the performance of the battery cell meets the requirements, the battery factory often has a primary and secondary injection process. The amount of each injection will be a little bit more, which will cause the electrolyte to overflow the injection hole. After the sealed aluminum nails are wiped before laser welding, there will still be problems such as electrolyte crystallization. When laser welding, high-temperature vaporization directly impacts the weld area, causing explosive point defects, and even fire and explosion and other safety risks.
[0005] A large number of verifications have found that the cracks are often located at the root of the weld. Through the stress analysis of the cracked position of the sealed aluminum nail weld, it can be seen that the mechanical constraint stress here is relatively large. The probability of sealing failure of the battery cell in the later stage increases under conditions such as gas production internal pressure, vibration and impact, thereby affecting the performance and service life of the battery, increasing the user's cost of use, affecting the user's experience, and is not conducive to the promotion and application of the above-mentioned batteries in the market.
[0006] This section merely provides background information related to the present disclosure and is not necessarily prior art. Utility Model Content
[0007] In order to overcome the defects in the above-mentioned prior art, the first utility model object of the utility model is to provide a battery cover plate, which has a simple and ingenious structure. The seal on it is sealed and connected by overlapping the upper and lower parts and using laser equipment for side welding. The weld position does not directly contact the internal space of the injection hole, reducing the poor welding and safety risks caused by problems such as electrolyte contamination, ensuring the sealing while ensuring the performance of the battery, extending the service life of the battery, reducing the user's use cost, and facilitating the promotion and application of the above-mentioned battery cover plate in the field of battery manufacturing technology. The second utility model object of the utility model is to provide a battery cell, which also has the advantages of good sealing and high structural strength by applying the above-mentioned battery cover plate. The third utility model object of the utility model is to provide a battery, which has the advantages of excellent performance and long life by applying the above-mentioned battery cell. The fourth utility model object of the utility model is to provide an electrical device, which also has the advantages of excellent performance and long life by applying the above-mentioned battery, thereby enhancing the user experience.
[0008] The battery cover, battery cell, battery and electrical device are technically related to each other and belong to the same utility model concept.
[0009] In order to achieve the above-mentioned first utility model purpose, the utility model adopts the following technical scheme: a battery cover plate, including a top cover plate and a sealing member, the top cover plate is provided with a liquid injection hole, and a mounting groove for installing the sealing member is formed above the liquid injection hole, and the sealing member is used to be installed in the mounting groove; the top cover plate is provided with overlapping vertical edges, and the overlapping vertical edges are arranged along the circumferential side of the mounting groove; the top of the sealing member is bent outward to form a sealing overlapping portion that cooperates with the overlapping vertical edges, and the sealing overlapping portion is sealed and connected to the overlapping vertical edges.
[0010] As a preferred solution of the utility model, a cover plate receiving groove is formed outside the overlapping vertical edge, and the sealing overlapping portion is sealed and connected to the overlapping vertical edge and then flattened by rolling and / or flanging process, so that the overlapping vertical edge and the sealing overlapping portion can be located in the cover plate receiving groove.
[0011] As a preferred solution of the utility model, the top of the sealing member is concave downward to form a stress release groove.
[0012] As a preferred solution of the utility model, the bottom of the sealing member is concave upward to form a gas production receiving groove.
[0013] As a preferred solution of the utility model, a bending notch is formed at the bottom of the overlapping vertical edge, and the bending notch is connected to the installation groove.
[0014] As a preferred solution of the utility model, the height of the overlapping vertical edge is matched with the width of the cover plate receiving groove; the depth of the cover plate receiving groove is matched with the thickness of the overlapping vertical edge and the sum of the thickness of the overlapping vertical edge.
[0015] As a preferred solution of the utility model, the sealing member is a sealing aluminum nail.
[0016] Compared with the prior art, the beneficial effects of the utility model are as follows: a battery cover plate in the utility model has an ingenious structure, by forming overlapping vertical edges on the top cover plate, forming a sealing overlapping portion that is bent outward and can overlap the overlapping vertical edges on the top of the seal, and then the sealing overlapping portion and the overlapping vertical edges are contacted by laser equipment or the like for side welding, thereby ensuring the sealing at the injection hole, and the weld position does not directly contact the internal space of the injection hole, reducing poor welding and safety risks caused by problems such as electrolyte contamination, ensuring the battery performance while ensuring the battery life, reducing the user's use cost, and being conducive to the promotion and application of the above-mentioned battery cover plate in the field of battery manufacturing technology.
[0017] Furthermore, after the sealing overlap portion and the overlapping vertical edge in the utility model are welded, the portion that exceeds the surface of the battery cover is flattened by a flattening tool. The work hardening of the profile itself after flanging can also increase the hardness of the top cover and the sealing aluminum nail vertical edge, which is used to resist the subsequent gas production internal pressure or vibration impact of the battery cell, thereby ensuring the overall structural strength of the battery.
[0018] In order to achieve the above-mentioned second utility model purpose, the utility model adopts the following technical solution: a battery cell, including the above-mentioned battery cover; and also including a battery shell with an opening, the battery cover is installed in the opening and is sealed and connected to the battery shell.
[0019] Compared with the prior art, the beneficial effect of the utility model is that a battery monomer in the utility model also has the advantages of good sealing and high structural strength by applying the above-mentioned battery top cover.
[0020] In order to achieve the third utility model objective mentioned above, the utility model adopts the following technical solution: a battery, comprising at least one battery cell mentioned above.
[0021] Compared with the prior art, the beneficial effect of the utility model is that a battery in the utility model has the advantages of excellent performance and long life by applying the above-mentioned battery monomer.
[0022] In order to achieve the fourth utility model objective, the utility model adopts the following technical solution: an electrical device, comprising the above-mentioned battery, wherein the battery is used to supply power to the electrical device.
[0023] Compared with the prior art, the beneficial effect of the present invention is that an electrical device in the present invention, by applying the above-mentioned battery, also has the advantages of excellent performance and long life, thereby enhancing the user experience. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 This is a schematic diagram of the structure of a battery cover in an embodiment of the utility model;
[0025] Figure 2 This is a schematic diagram of the structural disassembly of a battery cover in an embodiment of the utility model;
[0026] Figure 3 This is a structural cross-sectional view of a battery cover in an embodiment of the utility model;
[0027] Figure 4 yes Figure 3 A schematic diagram of the structure enlargement at the center A;
[0028] Figure 5 This is a schematic diagram of the structure of the sealing member in the embodiment of the utility model;
[0029] Figure 6 This is a structural cross-sectional view of a sealing member in an embodiment of the utility model;
[0030] Figure 7 It is a partial structural sectional view of a battery cover in an embodiment of the utility model.
[0031] Figure numerals: 1, top cover plate; 1-1, overlapping vertical edge; 1-2, cover plate receiving groove; 1-3, bending notch; 2, sealing member; 2-1, sealing overlapping portion; 2-2, gas generating receiving groove; 2-3, stress release groove; 3, liquid injection hole; 4, mounting groove; B, side welding surface. DETAILED DESCRIPTION
[0032] 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.
[0033] 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.
[0034] The embodiments of the utility model are described in detail below with reference to the accompanying drawings.
[0035] Embodiment 1: In order to solve the above technical problems, Figures 1 to 7 As shown, a battery cover plate includes a top cover plate 1 and a seal 2. The top cover plate 1 is provided with an injection hole 3. The injection hole 3 is for injecting electrolyte in the final stage of battery assembly. Electrolyte is a key component in the battery. It can provide a transmission medium for ions, thereby realizing the charging and discharging process of the battery. In order to prevent the volatilization or leakage of the electrolyte during the charging and discharging process of the battery, and also to prevent the invasion of external moisture and impurities, the seal 2 is sealed and installed at the injection hole 3. In the prior art, since the weld pool part cannot be filled into the deep weld in time, when the surface cracks solidify under the influence of welding heat, the internal brittle temperature zone has less liquid and more solid, and the strength is weakened after solidification or even cracks appear. In order to solve the above technical problems, in this embodiment, a mounting groove 4 for installing the above seal 2 is formed above the above injection hole 3, and the main shape of the mounting groove 4 is adapted to the shape of the above seal 2, and the sealing is achieved by installing the above seal 2 in the above mounting groove 4. Specifically, in this embodiment, the top cover plate 1 is provided with an overlapping vertical edge 1-1, and the overlapping vertical edge 1-1 is arranged along the peripheral side of the installation groove 4. The top of the sealing member 2 is bent outward to form a sealing overlapping portion 2-1 that matches the overlapping vertical edge 1-1. The contact between the sealing overlapping portion 2-1 and the overlapping vertical edge 1-1 is Figure 4 The side welding surface B shown is side welded by laser equipment, so as to realize the sealing connection between the sealing overlap portion 2-1 and the overlapping vertical edge 1-1. The cross section of the side welding surface B here is in the shape of a letter "I", which is different from the "T" shape in the prior art. In this embodiment, by changing the welding joint form of the sealing aluminum nail and the top cover plate 1, it is ensured that the welding molten pool can flow naturally and fill in the weld in time, which fully improves the undesirable phenomena such as brittle stress cracks.
[0036] The above-mentioned overlapping vertical edge 1-1 can be fixed to the surrounding side of the above-mentioned installation groove 1-4 by welding to ensure the sealed connection between the above-mentioned overlapping vertical edge 1-1 and the above-mentioned top cover plate 1, or the above-mentioned overlapping vertical edge 1-1 and the above-mentioned top cover plate 1 can be integrally injection molded, as long as the sealing of the connection between the above-mentioned overlapping vertical edge 1-1 and the above-mentioned top cover plate 1 can be ensured.
[0037] The seal 2 can be a sealing aluminum nail. The main function of the sealing aluminum nail is to provide a sealing effect for the battery, prevent electrolyte leakage and intrusion of external substances (such as moisture, dust, etc.), and ensure the stability of the internal environment of the battery. Aluminum materials have good corrosion resistance and can resist chemical corrosion inside the battery, extending the service life of the battery. Aluminum materials have good stability under temperature changes and will not soften or deform due to temperature increases, maintaining the reliability of the seal. At the same time, since aluminum materials are easy to process into the required shape and size, it is convenient to perform a flattening operation on them later.
[0038] In order to prevent the overlapping vertical edge 1-1 and the sealing aluminum nail from protruding from the surface of the top cover plate 1, thereby affecting the use and installation of the battery, in this embodiment, the overlapping vertical edge 1-1 and the sealing member 2 are sealed and connected by laser welding, and then the two are flattened by a flattening device, so that the surface of the sealing member 2 is flush with the surface of the top cover plate 1. In order to achieve flushness, in this embodiment, a cover plate receiving groove 1-2 is formed on the outside of the overlapping vertical edge 1-1, and the sealing overlapping portion 2-1 is flattened by rolling and / or flanging process after being sealed and connected with the overlapping vertical edge 1-1, so that the overlapping vertical edge 1-1 and the sealing overlapping portion 2-1 can be located in the cover plate receiving groove 1-2. The work hardening of the sealing overlapping portion 2-1 and the overlapping vertical edge 1-1 after flanging can also increase the hardness of the top cover plate 1 and the sealing aluminum nail vertical edge, which is used to resist the force of subsequent gas production internal pressure or vibration impact of the battery cell.
[0039] The seal 2, i.e., the sealing aluminum nail, is processed into an H-shaped upper and lower groove by a continuous stamping process, that is, the top of the seal 2 is stamped downward to make it concave to form a stress release groove 2-3. During the use of the battery, stress will be generated inside the battery due to temperature changes or mechanical vibrations. The stress release groove 2-3 can be used as a stress concentration relief area to disperse stress and prevent stress from concentrating on other parts of the seal 2, thereby reducing the risk of rupture. The stress release groove 2-3 here has the effect of stress release after the sealing aluminum nail is welded and flattened. The battery may expand or contract during the charging and discharging process, and the stress release groove 2-3 can also provide a certain elastic space, allowing the seal 2 to adapt to the change in battery volume without rupture. By stamping to form an inner groove, the structural strength of the seal 2 can be enhanced, making it more durable and resistant to external impact or pressure. The bottom of the seal 2 is stamped upward to make it concave to form a gas production receiving groove 2-2. During the charging and discharging process of the battery, gas may be generated, and the gas production receiving groove 2-2 can collect these gases to prevent them from accumulating inside the battery, thereby avoiding affecting the battery performance and safety. Changes in the internal pressure of the battery may affect the performance and life of the battery. The gas-producing receiving groove 2-2 can also serve as a pressure buffer to help maintain the pressure balance inside the battery. The presence of the gas-producing receiving groove 2-2 helps to reduce the impact of the internal gas of the battery on the battery structure and improve the stability of the battery during use. The stress release groove 2-3 and the gas-producing receiving groove 2-2 are arranged on the upper and lower surfaces of the seal 2 relative to each other and are not connected to each other, thereby ensuring the sealing effect of the seal 2. The shapes of the stress release groove 2-3 and the gas-producing receiving groove 2-2 are not limited here. In this embodiment, during the stamping process of the sealed aluminum nail, the thickness of the middle sealing wall can be appropriately thickened, and the thickness range is 0.3mm to 0.8mm, thereby improving the strength of the sealed aluminum nail body, that is, the stress release groove 2-3 and the gas-producing receiving groove 2-2 can be thickened by 0.3mm to 0.8mm on the basis of the original thickness.
[0040] In order to simplify the assembly process of the top cover plate 1 and improve the production efficiency of the battery, specifically, in order to facilitate the placement of the above-mentioned sealing overlap portion 2-1 and the above-mentioned overlap vertical edge 1-1 flange in the above-mentioned installation groove 4, a bending notch 1-3 is formed at the bottom of the above-mentioned overlap vertical edge 1-1 for facilitating the bending of the above-mentioned overlap vertical edge 1-1. The above-mentioned bending notch 1-3 is connected with the above-mentioned installation groove 4, which can ensure that the above-mentioned overlap vertical edge 1-1 does not generate internal stress after being flattened, thereby ensuring the structural strength of the connection between the above-mentioned overlap vertical edge 1-1 and the top cover plate 1, reducing the probability of fracture, and further ensuring the overall sealing performance of the battery.
[0041] The height of the overlapping vertical edge 1-1 is matched with the width of the cover receiving groove 1-2, and the depth of the cover receiving groove 1-2 is matched with the thickness of the overlapping vertical edge 1-1 and the sum of the thickness of the overlapping vertical edge 1-1. By ensuring that the height of the overlapping vertical edge 1-1 matches the width of the cover receiving groove 1-2, a close fit between the two can be ensured, thereby improving the stability of the overall structure of the top cover 1. The adaptive design helps to form a better seal, prevent electrolyte leakage or intrusion of external impurities, and ensure the safety and performance of the battery. Appropriate size adaptation can enhance the structural strength of the battery cover, enable it to withstand greater mechanical stress, and improve durability.
[0042] A battery cover in the present embodiment has an ingenious structure. An overlapping vertical edge 1-1 is formed on the top cover plate 1, and a sealing overlapping portion 2-1 that is bent outward and can overlap the overlapping vertical edge is formed on the top of the sealing member 2. The sealing overlapping portion 2-1 is then side-welded with a laser device or the like at the contact point with the overlapping vertical edge 1-1, thereby ensuring the sealing at the injection hole, and the weld position does not directly contact the internal space of the injection hole, reducing poor welding and safety risks caused by problems such as electrolyte contamination, ensuring the battery performance while ensuring the battery life, reducing the user's use cost, and being conducive to the promotion and application of the above-mentioned battery cover in the field of battery manufacturing technology.
[0043] Embodiment 2:
[0044] A battery cell comprises a battery cover plate in Example 1; and also comprises a battery shell having an opening, wherein the battery cover plate is installed in the opening and is sealed and connected to the battery shell. By applying the battery cover plate, the battery cell also has the advantage of excellent sealing performance.
[0045] Embodiment 3:
[0046] A battery, including the battery cell in embodiment 2, has the advantages of excellent performance and long life.
[0047] Embodiment 4:
[0048] An electrical device includes the battery in Example 3. The battery is used to supply power to the electrical device and also has the advantages of excellent performance and long life, thereby enhancing the user experience.
[0049] 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.
[0050] Although this article uses the following terms more often: 1, top cover plate; 1-1, overlapping vertical edge; 1-2, cover plate receiving groove; 1-3, bending notch; 2, sealing member; 2-1, sealing overlapping portion; 2-2, gas generating receiving groove; 2-3, stress release groove; 3, liquid injection hole; 4, installation groove; B, side welding surface, 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 battery cover, characterized in that: The invention comprises a top cover plate (1) and a sealing member (2), wherein the top cover plate (1) is provided with a liquid injection hole (3), and a mounting groove (4) for mounting the sealing member (2) is formed above the liquid injection hole (3), and the sealing member (2) is used to be mounted in the mounting groove (4); the top cover plate (1) is provided with an overlapping vertical edge (1-1), and the overlapping vertical edge (1-1) is arranged along the peripheral side of the mounting groove (4); the top of the sealing member (2) is bent outward to form a sealing overlapping portion (2-1) matching the overlapping vertical edge (1-1), and the sealing overlapping portion (2-1) is sealingly connected to the overlapping vertical edge (1-1).
2. A battery cover according to claim 1, characterized in that: A cover plate receiving groove (1-2) is formed outside the overlapping vertical edge (1-1), and the sealing overlapping portion (2-1) is flattened by rolling and / or flanging after being sealed and connected to the overlapping vertical edge (1-1), so that the overlapping vertical edge (1-1) and the sealing overlapping portion (2-1) can be located in the cover plate receiving groove (1-2).
3. A battery cover according to claim 2, characterized in that: The top of the sealing component (2) is concave downward to form a stress release groove (2-3).
4. A battery cover according to claim 3, characterized in that: The bottom of the sealing member (2) is concave upward to form a gas production receiving groove (2-2).
5. A battery cover according to claim 1, characterized in that: A bending notch (1-3) is formed at the bottom of the overlapping vertical edge (1-1), and the bending notch (1-3) is connected to the installation groove (4).
6. A battery cover according to claim 2, characterized in that: The height of the overlapping vertical edge (1-1) is matched to the width of the cover plate receiving groove (1-2); the depth of the cover plate receiving groove (1-2) is matched to the thickness of the overlapping vertical edge (1-1) and the sum of the thickness of the overlapping vertical edge (1-1).
7. A battery cover according to claim 1, characterized in that: The sealing member (2) is a sealing aluminum nail.
8. A battery cell, characterized in that: It comprises a battery cover as described in any one of claims 1 to 7; and also comprises a battery shell having an opening, wherein the battery cover is mounted on the opening and is sealed and connected to the battery shell.
9. A battery, characterized in that: Comprising at least one battery cell as claimed in claim 8.
10. An electrical device, characterized in that: The invention comprises the battery as claimed in claim 9, wherein the battery is used to supply power to the electrical device.