Cover plate assembly, battery cell and battery

Abstract

The utility model relates to a battery field provides a cover plate subassembly, electric core and battery. Cover plate subassembly includes cover plate body, and the side of cover plate body towards shell is provided with positioning part, and cover plate body is suitable for through positioning part and shell positioning cooperation, along the thickness direction of cover plate body, the outer wall of cover plate body is formed with welding area away from positioning part. The cover plate subassembly can quickly install the cover plate to the correct position, greatly improves the assembly efficiency, reduced the installation error and rework situation because of the inaccurate positioning, still make in the welding fixed process of cover plate subassembly and shell, can realize the connection of both through such as penetration welding etc. in the welding area forms. Compared with the form of laser seam welding in the related art, since the thickness of the cover plate is relatively thick, heat penetration can be prevented, and the formation of welding beads between the cover plate and the shell is avoided, ensuring the connection stability of the cover plate body and the shell.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and provides a cover plate assembly, a battery cell, and a battery. Background Technology

[0002] During battery casing manufacturing, the cover plate is typically assembled to the casing using steps, and then sealed using laser side welding to ensure the battery's airtightness and safety. However, because the battery casing is relatively thin, the heat generated during laser welding can easily penetrate it. This heat transfer can cause weld beads to appear in the mating area between the cover plate and the casing, affecting the overall performance and safety of the battery.

[0003] In existing technologies, to address the issue of heat penetration into the casing during laser welding, attempts are often made to increase the casing thickness or use heat-shielding materials to isolate the welding heat. However, these methods not only increase material costs but also fail to completely prevent heat penetration and affect the compact design of the battery. Therefore, existing welding methods still have certain limitations and problems, necessitating the exploration of more effective solutions to ensure that the heat generated during welding does not affect the fit accuracy between the cover plate and the casing, or the overall performance of the battery. Utility Model Content

[0004] This utility model provides a cover plate assembly to solve the defect in the related art where welding between the cover plate assembly and the housing easily produces weld beads.

[0005] This utility model embodiment also provides a battery cell.

[0006] This utility model embodiment also provides a battery.

[0007] A first aspect of this utility model provides a cover plate assembly, including a cover plate body. A positioning part is provided on the side of the cover plate body facing the housing. The cover plate body is adapted to be positioned and engaged with the housing through the positioning part. A welding area is formed on the outer wall of the cover plate body away from the positioning part along the thickness direction of the cover plate body.

[0008] According to one embodiment of the present invention, the positioning part includes:

[0009] An overlapping platform, along the thickness direction of the cover plate body, overlaps the end of the housing;

[0010] An abutment is formed on one side of the overlapping platform, and a gap is formed between the abutment and the inner wall of the end of the housing.

[0011] According to one embodiment of the present invention, the thickness of the overlapping platform ranges from 0.2 mm to 1 mm.

[0012] According to one embodiment of the present invention, the gap is less than or equal to 0.1 mm.

[0013] According to one embodiment of the present invention, the edge of the abutment platform is formed with a chamfered structure.

[0014] According to one embodiment of the present invention, the thickness of the cover plate body ranges from 1.5 mm to 3 mm.

[0015] According to one embodiment of the present invention, the thickness of the shell ranges from 0.15 mm to 1 mm.

[0016] According to one embodiment of the present invention, the cover plate body and the housing are welded by through welding, and the welding area is the working area for through welding.

[0017] A second aspect of this utility model provides a battery cell, including a housing and the aforementioned cover plate assembly.

[0018] A third aspect of this utility model provides a battery, including the cover plate assembly described above;

[0019] or,

[0020] The aforementioned battery cells.

[0021] According to the cover plate assembly provided in the first aspect of this utility model, by providing a positioning part on the side of the cover plate body facing the housing, the positioning and engagement between the cover plate body and the housing becomes simple and accurate. During product assembly, the cover plate can be quickly installed in the correct position, greatly improving assembly efficiency and reducing installation errors and rework caused by inaccurate positioning. Simultaneously, precise positioning also helps ensure the sealing and stability between the cover plate body and the housing. By providing a welding area on the outer wall of the cover plate body away from the positioning part, the connection between the cover plate assembly and the housing can be achieved through welding, such as through welding, during the welding and fixing process. Compared to the laser seam welding method used in related technologies, the relatively thick cover plate prevents heat penetration, avoids the formation of weld beads between the cover plate and the housing, and ensures the connection stability between the cover plate body and the housing.

[0022] According to the second aspect of the present invention, a robust structure is formed between the cover plate assembly and the housing through the positioning and fitting of the overlapping portion and the through-welding connection. When the battery cell is subjected to external forces such as vibration or impact, it effectively prevents the cover plate assembly from separating from the housing, avoiding exposure of the internal electrodes and electrolyte, and reducing the risk of short circuits, fires, and other safety accidents. Furthermore, the through-welding process features high welding speed and high welding quality, making it suitable for mass production. While ensuring connection strength and sealing, it effectively improves production efficiency, reduces production costs, and prevents weld beads from forming between the cover plate body and the housing.

[0023] According to the third aspect embodiment of this utility model, whether it is a battery including the aforementioned cover plate assembly or a battery including the aforementioned cell, the cover plate assembly and the casing are positioned and connected by overlapping parts and through welding, forming a robust structure. This structure can effectively resist external forces such as vibration and impact, prevent loosening and separation of battery components, and avoid exposure of internal electrodes and electrolyte, thereby reducing the risk of short circuits, fires, and other safety accidents. It also effectively prevents electrolyte leakage, avoids electrolyte corrosion of the surrounding environment and other components, and prevents external moisture, oxygen, and other impurities from entering the battery, protecting the core components and further improving battery safety. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic top view of the cover plate assembly provided by this utility model.

[0026] Figure 2 yes Figure 1 A schematic cross-sectional view along the AA direction.

[0027] Figure 3 yes Figure 2 A magnified view of a section at point B.

[0028] Figure label:

[0029] 100. Cover plate body; 102. Shell; 104. Positioning part; 106. Welding area; 108. Overlapping platform; 110. Abutting platform. Detailed Implementation

[0030] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0031] like Figures 1 to 3 As shown, the first aspect of this utility model provides a cover plate assembly, including a cover plate body 100. A positioning part 104 is provided on the side of the cover plate body 100 facing the housing 102. The cover plate body 100 is adapted to be positioned and engaged with the housing 102 through the positioning part 104. A welding area 106 is formed on the outer wall of the cover plate body 100 away from the positioning part 104 along the thickness direction of the cover plate body 100.

[0032] According to the cover plate assembly provided in the first aspect of this utility model, by providing a positioning part 104 on the side of the cover plate body 100 facing the housing 102, the positioning and engagement between the cover plate body 100 and the housing 102 becomes simple and accurate. During product assembly, the cover plate can be quickly installed in the correct position, greatly improving assembly efficiency and reducing installation errors and rework caused by inaccurate positioning. At the same time, precise positioning also helps to ensure the sealing and stability between the cover plate body 100 and the housing 102. By providing a welding area 106 on the outer wall of the cover plate body 100 away from the positioning part 104, the connection between the cover plate assembly and the housing 102 can be achieved by performing a method such as penetration welding in the welding area 106 during the welding and fixing process. Compared with the laser seam welding method used in related technologies, the relatively thick cover plate can prevent heat penetration and avoid the formation of weld beads between the cover plate and the housing 102, thus ensuring the connection stability between the cover plate body 100 and the housing 102.

[0033] Please continue reading Figures 1 to 3 The cover body 100 serves as the main structure of the entire cover assembly. The shape, size, and material of the cover body 100 can be flexibly set according to the actual application scenario and equipment requirements.

[0034] A positioning part 104 is formed on the side of the cover plate body 100 facing the housing 102. The positioning part 104 is used to ensure precise positioning and engagement between the cover plate body 100 and the housing 102. The positioning part 104 can be, for example, a protrusion, a groove, or a snap-fit. Taking a protrusion as an example, the shape of the protrusion can be rectangular, circular, or trapezoidal, etc., and its size and distribution position can be designed according to the corresponding positioning structure on the housing 102 to ensure that when the cover plate body 100 is installed on the housing 102, it can be quickly and accurately positioned and remain relatively stable during the use of the equipment without easily shifting.

[0035] Along the thickness direction of the cover plate body 100, a welding area 106 is formed on the outer wall of the cover plate body 100 opposite to the positioning part 104. The welding area 106 provides a region for subsequent welding connection between the cover plate assembly and the housing 102. The size and shape of the welding area 106 are also determined according to the specific welding process. For example, if laser welding is used, the welding area 106 needs to be relatively flat and smooth to ensure that the laser energy can be applied evenly to the welding area; if arc welding is used, the shape and size of the welding area 106 must take into account the operating space of the welding rod and the distribution of welding current.

[0036] According to one embodiment of the present invention, the positioning part 104 includes an overlapping platform 108 and an abutting platform 110; along the thickness direction of the cover plate body 100, the overlapping platform 108 overlaps with the end of the housing 102; the abutting platform 110 is formed on one side of the overlapping platform 108, and a gap is formed between the abutting platform 110 and the inner wall of the end of the housing 102.

[0037] In one embodiment of this utility model, the overlapping platform 108 and the cover plate body 100 are integrated into one piece, ensuring the structural strength of the overlapping platform 108. Along the thickness direction of the cover plate body 100, the overlapping platform 108 is designed to overlap the end of the housing 102.

[0038] The abutment platform 110 is located on one side of the overlapping platform 108 and is also integrally formed with the cover plate body 100. The abutment platform 110 is not in close contact with the inner wall of the end of the housing 102, but a certain amount of gap is reserved. In the subsequent welding process, the weld pool can compensate for this gap, thereby making the connection between the cover plate body 100 and the housing 102 more stable.

[0039] In other words, the overlap between the mounting platform 108 and the end of the housing 102 provides direct support and positioning. By providing a gap between the mounting platform 110 and the inner wall of the end of the housing 102, the cover body 100 and the housing 102 may deform to varying degrees due to thermal expansion and contraction when the battery is used at different ambient temperatures. The gap provides a buffer space for this deformation, avoiding stress concentration caused by mutual compression.

[0040] According to one embodiment of the present invention, the thickness of the overlapping platform 108 ranges from 0.2 mm to 1 mm.

[0041] When the thickness of the overlapping platform 108 is between 0.2 mm and 1 mm, it is possible to achieve product lightweighting while ensuring a certain structural strength. For the cover plate assembly, if the thickness of the overlapping platform 108 is less than 0.2 mm, it is prone to deformation or even breakage under external force, failing to securely connect the cover plate body to the housing 102 and affecting the overall structural stability of the product. If the thickness of the overlapping platform 108 is greater than 1 mm, although the structural strength will be improved, the weight of the product will increase. Controlling the thickness of the overlapping platform 108 within this range can better balance these two requirements.

[0042] According to one embodiment of the present invention, the gap is less than or equal to 0.1 mm.

[0043] When the gap is less than or equal to 0.1 mm, the sealing performance of the product can be greatly improved. For products containing this cover assembly and housing 102 structure, such as in battery applications, a smaller gap can effectively prevent electrolyte leakage, avoiding electrolyte corrosion of other internal battery components and pollution of the surrounding environment. Simultaneously, it can also prevent external impurities such as moisture and oxygen from entering the battery, reducing electrode oxidation and corrosion, and ensuring stable battery performance and lifespan. In electronic devices, gap control can achieve certain dustproof and waterproof ratings, such as IP67 or even higher, protecting delicate internal electronic components from external environmental interference and improving the reliability and stability of the equipment.

[0044] According to one embodiment of the present invention, the edge of the abutment platform 110 is formed with a chamfered structure.

[0045] The abutment platform 110, as part of the positioning part 104, has a chamfered structure at its edge. For example, the chamfered structure can be achieved by removing the right-angled portion of the edge of the abutment platform 110, forming an inclined transition surface. The size, angle, and shape of the chamfer can be designed according to actual needs. For example, a 45-degree chamfer or a rounded chamfer can be used. During manufacturing, the chamfered edge of the abutment platform 110 can be achieved through machining (such as grinding, milling, etc.) or mold forming.

[0046] When assembling the cover plate assembly with the housing 102, the chamfered structure effectively prevents sharp collisions or interference between the edge of the abutment platform 110 and the inner wall of the end of the housing 102. During the assembly operation, the chamfer acts as a guide, allowing the abutment platform 110 to smoothly enter the mating position with the housing 102, reducing jamming and obstruction during the assembly process and improving assembly efficiency.

[0047] According to one embodiment of the present invention, the thickness of the cover plate body 100 ranges from 1.5 mm to 3 mm.

[0048] A thickness range of 1.5 mm to 3 mm effectively ensures the structural strength of the cover plate body 100. When the product is subjected to a certain degree of external impact, such as collisions during transportation, the cover plate body 100 of this thickness can avoid easy deformation or breakage. For example, in battery products, if the cover plate body 100 is less than 1.5 mm thick, it may be damaged by changes in internal battery pressure or minor external impacts, leading to safety issues such as electrolyte leakage. While a thickness exceeding 3 mm further increases strength, it also increases unnecessary material costs and product weight. Within this thickness range, structural strength requirements can be met while maintaining product reliability and stability.

[0049] According to one embodiment of the present invention, the thickness of the housing 102 ranges from 0.15 mm to 1 mm.

[0050] From a manufacturing perspective, a shell 102 with a thickness of 0.15 mm to 1 mm requires more reasonable material costs compared to a shell 102 that is too thin or too thick. Stable thickness control helps improve product quality consistency and reduces the defect rate caused by thickness deviations.

[0051] According to one embodiment of the present invention, the cover plate body 100 and the shell 102 are welded by through welding, and the welding area 106 is the working area for through welding.

[0052] In one embodiment of this utility model, through-welding enables the cover plate body 100 and the housing 102 to achieve deep fusion, resulting in a welded joint with high strength capable of withstanding significant tensile and shear forces. Compared to other connection methods, the structure after through-welding is more stable, greatly improving the structural reliability of the entire device. Because through-welding completely fuses the cover plate body 100 and the housing 102 in the welding area 106, it eliminates gaps that may exist in traditional connection methods, thus effectively improving the sealing performance between the cover plate body 100 and the housing 102.

[0053] A second aspect of this utility model provides a battery cell, including a housing 102 and the aforementioned cover plate assembly.

[0054] The battery cell is mainly composed of the housing 102 and the aforementioned cover plate assembly. The housing 102 is the external support structure of the battery cell, and its material is generally metal (such as aluminum, steel, etc.) or plastic. It is mainly used to protect the electrodes, electrolyte and other components inside the battery cell, and plays a key role in sealing and connecting the electrodes.

[0055] The electrodes inside the battery cell are connected to the cover plate assembly via conductive connectors, thereby enabling connection to the external circuit. The electrodes, electrolyte, and other components are encapsulated inside the housing 102. The sealing function of the cover plate assembly prevents electrolyte leakage and also prevents external impurities such as moisture and oxygen from entering the battery cell, thus avoiding adverse effects on the battery cell's performance.

[0056] According to the battery cell provided in the second aspect embodiment of this utility model, a stable structure is formed between the cover plate assembly and the housing 102 through the positioning and fitting of the overlapping portion and the welding connection of the through-weld. When the battery cell is subjected to external forces such as vibration and impact, it can effectively prevent the cover plate assembly from separating from the housing 102, avoid the exposure of internal electrodes and electrolyte, and reduce the risk of safety accidents such as short circuits and fires. In addition, the through-weld process has the characteristics of fast welding speed and high welding quality, which is suitable for mass production. While ensuring connection strength and sealing, it can effectively improve production efficiency, reduce production costs, and avoid the formation of weld beads between the cover plate body 100 and the housing 102.

[0057] A third aspect of this utility model provides a battery, including the cover plate assembly described above;

[0058] or,

[0059] The aforementioned battery cells.

[0060] If the battery adopts the aforementioned cover plate assembly in its structure, the overlapping portion and welding area 106 on the cover plate assembly provide precise positioning and a certain buffer space for the installation and fit of various battery components; at the same time, through welding processes such as through welding, it is firmly connected to other battery components, ensuring the sealing and stability of the battery structure. In addition, the cover plate assembly may also integrate related structures such as electrode connections to realize the electrical connection between the internal and external circuits of the battery.

[0061] If the battery uses the aforementioned cell, the cell casing 102 not only protects the internal electrodes and electrolyte from external environmental influences such as moisture and oxygen, but also reliably connects to the cover assembly. Through the positioning of the overlapping portion and the through-welding connection of the welding area 106, the cell's sealing and structural stability are ensured, preventing electrolyte leakage and the entry of external impurities, thus guaranteeing the cell's normal operation in a stable environment.

[0062] According to the third aspect embodiment of this utility model, whether it is a battery including the aforementioned cover plate assembly or a battery including the aforementioned battery cell, the cover plate assembly and the housing 102 are positioned and connected by overlapping portions and through welding, forming a robust structure. This structure can effectively resist external forces such as vibration and impact, prevent loosening and separation of battery components, and avoid exposure of internal electrodes and electrolyte, thereby reducing the risk of short circuits, fires, and other safety accidents. It also effectively prevents electrolyte leakage, avoids electrolyte corrosion of the surrounding environment and other components, and prevents external moisture, oxygen, and other impurities from entering the battery, protecting the core components of the battery and further improving battery safety.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A cover plate assembly, characterized in that, Includes a cover plate body, wherein a positioning part is provided on the side of the cover plate body facing the housing, the cover plate body is adapted to be positioned and engaged with the housing through the positioning part, and a welding area is formed on the outer wall of the cover plate body opposite to the positioning part along the thickness direction of the cover plate body; The positioning unit includes: An overlapping platform, along the thickness direction of the cover plate body, overlaps the end of the housing; An abutment is formed on one side of the overlapping platform, and a gap is formed between the abutment and the inner wall of the end of the housing.

2. The cover plate assembly according to claim 1, characterized in that, The thickness of the overlapping platform ranges from 0.2 mm to 1 mm.

3. The cover plate assembly according to claim 1, characterized in that, The gap is less than or equal to 0.1 mm.

4. The cover plate assembly according to claim 1, characterized in that, The edge of the contact platform has a chamfered structure.

5. The cover plate assembly according to any one of claims 1 to 3, characterized in that, The thickness of the cover plate body ranges from 1.5 mm to 3 mm.

6. The cover plate assembly according to any one of claims 1 to 3, characterized in that, The thickness of the shell ranges from 0.15 mm to 1 mm.

7. The cover plate assembly according to any one of claims 1 to 3, characterized in that, The cover plate body and the shell are welded by through welding, and the welding area is the working area for through welding.

8. A battery cell, characterized in that, It includes a housing and a cover assembly as described in any one of claims 1 to 7.

9. A battery, characterized in that, Includes the cover plate assembly as described in any one of claims 1 to 7; or, The battery cell as described in claim 8.

Images