A case and a battery

Abstract

The present utility model provides a housing and a battery for accommodating an electric core. The first housing includes a bottom surface and a first side surface. The first side surface surrounds the edge of the bottom surface and forms a first accommodation groove with the bottom surface; the second side surface is fixedly connected to the top surface. The second side surface surrounds the edge of the top surface and forms a second accommodation groove with the top surface; the opening of the second accommodation groove is accommodated within the first accommodation groove. The first side surface includes a first welding area and a limiting portion. The limiting portion is provided between the first welding area and the bottom surface, and the limiting portion abuts against the opening of the second accommodation groove; the thickness of the first welding area is A, and the thickness of the limiting portion is B, where A < B; the second side surface includes a second welding area. Along the thickness direction of the second side surface, the second welding area overlaps with the first welding area to form a welding area. The thickness of the second side surface is C, and the thickness of the welding area is D, where C + A ≤ D ≤ C + B. For the housing and battery of the present utility model, deformation of the housing during welding can be effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy, in particular to a housing and a battery. Background Art

[0002] In the design process of lithium batteries, it is necessary to protect the battery cells through a housing. When manufacturing the housing, welding is required. When welding the housing, high temperature will cause certain internal stress on the housing. When the thickness of the housing is relatively thin, the internal stress will cause the housing to deform. Therefore, most of the existing steel shell battery housings use a structure with a flange edge during welding. However, the flange edge structure will reduce the assembly efficiency of the battery in the battery compartment and affect the overall ED. For a structure without a flange edge, welding will cause the housing to deform, affecting the appearance and safety performance of the battery. Therefore, a housing that can both improve the energy density of the battery and avoid welding deformation is needed. Summary of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides a housing that can effectively avoid deformation during welding.

[0004] The utility model also provides a battery.

[0005] The housing according to the first aspect embodiment of the utility model is used to accommodate battery cells. The housing includes: a first housing, the first housing includes a bottom surface and a first side surface, the first side surface is fixedly connected to the bottom surface, the first side surface surrounds the edge of the bottom surface and forms a first receiving groove with the bottom surface; a second housing, the second housing includes a top surface and a second side surface, the second side surface is fixedly connected to the top surface, the second side surface surrounds the edge of the top surface and forms a second receiving groove with the top surface; the opening of the second receiving groove is received within the first receiving groove. The first side surface includes a first welding area and a limiting portion. The limiting portion is provided between the first welding area and the bottom surface, and the limiting portion abuts against the opening of the second receiving groove; the thickness of the first welding area is A, the thickness of the limiting portion is B, and A < B; the second side surface includes a second welding area. Along the thickness direction of the second side surface, the second welding area overlaps with the first welding area to form a welding area. The thickness of the second side surface is C, and the thickness of the welding area is D, where C + A ≤ D ≤ C + B.

[0006] The housing according to the first aspect of the present invention has at least the following beneficial effects: internal stress is generated when the housing is welded, and deformation is likely to occur in the thickness direction of the structure after the internal stress is generated. Therefore, the second side and the first side overlap to form the welding area, and the opening of the second receiving groove is accommodated in the first receiving groove, so that the second side and the first side are fitted together, so that welding can be performed more conveniently even if the housing is slightly deformed, while effectively avoiding deformation of the top and bottom surfaces.

[0007] According to some embodiments of the present invention, an injection hole is provided on the first side surface, the injection hole penetrates the first side surface, and a first clearance groove is provided on the second side surface. Along the thickness direction of the second side surface, the first clearance groove corresponds to the injection hole, and the distance between the edge of the injection hole and the edge of the first clearance groove is not less than 0.5 mm.

[0008] According to some embodiments of the present invention, a pole hole is provided on the first side surface, the pole hole penetrates the first side surface, and a second clearance groove is provided on the second side surface. Along the thickness direction of the second side surface, the second clearance groove corresponds to the pole hole, and the distance between the edge of the pole hole and the edge of the second clearance groove is not less than 0.5mm.

[0009] According to some embodiments of the present invention, the edge of the first side away from the bottom surface is flush.

[0010] According to some embodiments of the present invention, the second welding area is disposed along the edge of the second side away from the top surface, and the width of the second welding area is not greater than 0.5 mm and not less than 0.1 mm.

[0011] According to some embodiments of the present invention, the thickness of the limiting portion is greater than the thickness of the second side surface.

[0012] According to some embodiments of the present invention, at least one of the following conditions must be met: 0.05mm≤B≤0.3mm, 1mm≤C or D≤2mm.

[0013] According to some embodiments of this utility model, an insulating element is provided inside the electrode post hole, and the insulating element is used to isolate the electrode post from the first side surface.

[0014] According to some embodiments of the present invention, the distance between the second welding area and the top surface is not less than 0.5 mm.

[0015] The battery according to a second aspect of the present invention includes the casing and the battery cell as described in any of the above embodiments.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a shell according to the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of the first shell of a shell according to the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of the second shell of a shell according to the present invention;

[0020] Figure 4 This is a schematic diagram of the region of the second shell of a shell according to the present invention;

[0021] Figure 5 This is a cross-sectional schematic diagram of the second side and the first side of the shell of this utility model.

[0022] Icon labels:

[0023] 1. First housing; 11. Bottom surface; 12. First side surface; 13. First receiving groove; 14. Injection hole; 15. Pole post hole; 16. Limiting part; 17. Edge of injection hole; 18. Edge of pole post hole; 19. First welding area; 2. Second housing; 21. Top surface; 22. Second side surface; 23. Second receiving groove; 24. First clearance groove; 25. Second clearance groove; 26. Second welding area; 27. Deformation area; 28. Edge of first clearance groove; 29. ​​Edge of second clearance groove; 3. Insulating component. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0025] In the description of this utility model, it should be understood that the orientation descriptions, such as up and down, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0027] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0028] The battery casing plays several key roles: As the outer layer of the battery, its primary function is to protect the internal structure from external damage. It withstands physical impacts, compression, and a certain degree of chemical corrosion, ensuring the battery functions properly in complex environments. The casing provides excellent sealing, effectively preventing electrolyte leakage and thus avoiding harm to the environment and human health. Furthermore, its design prioritizes explosion-proof capabilities, maintaining stability even when internal pressure rises abnormally, preventing battery explosions. The casing also contributes to improved overall battery performance. For example, the excellent thermal conductivity of steel helps the battery dissipate heat better, preventing overheating from negatively impacting performance. Additionally, the casing's structural strength is sufficient to withstand the expansion forces generated by the cells during charging and discharging, ensuring the integrity of the battery structure. The casing is easy to disassemble and classify during battery recycling, facilitating material recycling and reducing environmental impact. This aligns with current environmental regulations and reflects the sustainability of battery design. In summary, the battery casing serves multiple purposes, including protecting the internal structure, acting as electrodes, providing sealing and explosion-proof capabilities, improving battery performance, and supporting environmental protection and recycling. These functions work together to ensure the safe, stable, and efficient operation of the battery.

[0029] To ensure the casing's airtightness, it is formed through welding. This involves placing the battery cell inside the casing and then sealing it with welded metal. To increase the battery's energy density, the casing walls are made relatively thin. However, these thin walls are more prone to deformation during welding. Deformation of the walls may prevent the casing from forming a tight, sealed cavity.

[0030] Reference Figure 1 , Figure 2 and Figure 3, the housing in the first embodiment of the present utility model is used to accommodate the battery cell. The housing includes: a first housing 1 and a second housing 2. Before the housing is hermetically welded, the housing is divided into two parts, namely the first housing 1 and the second housing 2. After the battery cell is placed in the first housing 1, the second housing 2 is then welded onto the first housing 1. Thus, the housing forms a sealed space to accommodate the battery cell. The welding method can be any one of shielded metal arc welding, submerged arc welding, tungsten inert gas welding, gas welding, laser welding, CO2 gas shielded arc welding, friction welding, ultrasonic welding, soldering, brazing.

[0031] The first housing 1 includes a bottom surface 11 and a first side surface 12. The first side surface 12 is fixedly connected to the bottom surface 11. The first side surface 12 surrounds the edge of the bottom surface 11 and forms a first receiving groove 13 with the bottom surface 11; the second housing 2 includes a top surface 21 and a second side surface 22. The second side surface 22 is fixedly connected to the top surface 21. The second side surface 22 surrounds the edge of the top surface 21 and forms a second receiving groove 23 with the top surface 21; the opening of the second receiving groove 23 is received within the first receiving groove 13, so that the inner wall of the first side surface 12 is in contact with the second receiving groove 23. The first housing 1 forms the first receiving groove 13 through the bottom surface 11 and the first side surface 12. The first receiving groove 13 is used to place the battery cell. At the same time, the second housing 2 forms the second receiving groove 23 through the top surface 21 and the second side surface 22. The first receiving groove 13 and the second receiving groove 23 together form a chamber to accommodate the battery cell. After the inner wall of the first side surface 12 is in contact with the second receiving groove 23, there is a larger contact surface, which not only makes it easier to connect the second housing 2 and the first housing 1, but also makes the housing have better sealing performance. The first side surface 12 includes a first welding area 19 and a limiting portion 16. The limiting portion 16 is provided between the first welding area 19 and the bottom surface 11. The limiting portion 16 abuts against the opening of the second receiving groove 23. When the opening of the second receiving groove 23 is received within the first receiving groove 13, the limiting portion 16 is used for limiting, so as to prevent the area of the second side surface 22 overlapping with the first side surface 12 from being too large. The second side surface 22 includes a second welding area 26. Along the thickness direction of the second side surface 22, the second welding area 26 overlaps with the first welding area 19 to form a welding area. The overlapping area of the first welding area 19 and the second welding area 26 is the welding area. By providing the limiting portion 16, the width of the welding area can be more accurately controlled. The thickness of the first welding area 19 is A, and the thickness of the limiting portion is B, A < B, which can not only better perform the limiting function, but also prevent the thickness of the welding area 26 from being too large.

[0032] Furthermore, the distance between the edge of the opening of the first receiving groove 13 and the edge of the opening of the second receiving groove 23 is not less than 1 mm, that is, the width of the welding area is not less than 1 mm. The distance between the edge of the opening of the first receiving groove 13 and the edge of the opening of the second receiving groove 23 is not less than 1 mm, ensuring sufficient overlap between the second side 22 and the first side 12, thus providing a sufficiently wide welding area and facilitating welding within the overlap area. Welding can also be performed even if the second side 22 or the first side 12 undergoes some deformation during welding. Furthermore, a deformation area 27 is provided between the second welding area 26 and the top surface 21. Welding is performed in the second welding area 26, and the deformation area 27 can reduce or even eliminate the impact of deformation of the second welding area 26 on the top surface 21, thereby preventing welding deformation from causing the casing to compress the battery cell. Furthermore, the distance between the edge of the opening of the second welding area 26 and the first receiving groove 13 is not less than 0.5 mm, thereby reducing the thermal impact of welding on the top surface 21 and effectively preventing deformation of the top surface 21 during welding. The thickness of the second side 22 is C, and the thickness of the welding area is D, where C+A≤D≤C+B. Limiting the thickness of the welding area avoids affecting the energy density of the battery cell while ensuring welding quality. Further, 0.05mm≤B≤0.3mm or 1mm≤C or D≤2mm is specified. Limiting the thickness of the second side of the casing prevents the side thickness from being too small, which would affect structural strength and welding quality.

[0033] The process of injecting electrolyte into the battery casing typically involves the following steps: First, ensure the cleanliness and sealing of the battery casing to prevent impurities from entering and leakage during the injection process. Next, use specialized injection equipment, usually equipped with a precise metering and control system, to ensure accuracy and safety during injection. Insert the injection needle of the equipment into the injection hole 14 of the battery casing, ensuring a tight fit between the needle and the hole 14 to prevent leakage. Start the injection equipment and slowly inject the predetermined amount of electrolyte into the battery casing. During the injection process, closely monitor the injection speed and volume to ensure compliance with process requirements. After injection is complete, promptly remove the injection needle and seal the injection hole 14 to prevent air and moisture from entering the battery. Therefore, an injection hole 14 is necessary on the casing.

[0034] According to some embodiments of this utility model, a liquid injection hole 14 is provided on the first side surface 12, penetrating the first side surface 12. The liquid injection hole 14 is used to inject electrolyte into the first receiving tank 13. A first clearance groove 24 is provided on the second side surface 22 so that the liquid injection hole 14 is exposed outside the second side surface 22. The distance between the edge of the liquid injection hole 14 and the edge of the first clearance groove 24 is not less than 0.5 mm. The liquid injection hole 14 is provided so that electrolyte can be injected into the shell after the shell is sealed and welded. The first clearance groove 24 is provided to ensure smooth injection of electrolyte into the shell and avoid interference during liquid injection. At the same time, the distance between the edge of the liquid injection hole 14 and the edge of the first clearance groove 24 is not less than 0.5 mm to avoid the welding affecting the liquid injection hole 14. For example, when welding the second side 22 to the first side 12, the heat generated during welding causes the second side 22 to deform. The distance between the edge of the injection hole 14 and the edge of the first clearance groove 24 can accommodate this deformation, preventing the second side 22 from obstructing the injection hole 14. Furthermore, to ensure that the injection equipment can smoothly inject liquid through the injection hole 14, the distance between the second side 22 and the first side 12 is increased by setting the first clearance groove 24, preventing deformation of the injection hole 14 during welding and thus ensuring smooth injection operation. The edge 17 of the injection hole refers to the outer edge line of the injection hole 14 on the inner surface of the first side 12. The edge 28 of the first clearance groove refers to the outer edge line of the first clearance groove 24 formed on the second side 22.

[0035] According to some embodiments of this utility model, a terminal hole 15 is provided on the first side 12, penetrating the first side 12 and used to accommodate the terminal on the battery cell. A second clearance groove 25 is provided on the second side 22 to expose the terminal hole 15 outside the second side 22. The distance between the edge of the terminal hole 15 and the edge of the second clearance groove 25 is not less than 0.5mm. The terminal on the battery cell is an important component of the battery structure. The terminal, also called a terminal, is a component that connects to one pole of an adjacent single cell in the battery pack. On the battery cell, one end of the terminal is directly connected to the busbar, and the other end is connected to an external conductor, playing a role in current conduction. During charging and discharging, the terminal ensures the normal flow of current, which is crucial for the normal operation of the battery. The terminals on the battery cell are usually divided into positive terminals and negative terminals, which are connected to the positive and negative tabs of the battery cell, respectively. The terminals may be located at the ends of the battery casing along the length direction, partly inside the casing and connected to the tabs, and partly outside the casing and connected to external devices such as the busbar. The connection methods between the terminal and the tab may include welding, connection via a current collector, etc. The material and design of the terminal are crucial to the battery's performance and safety. Typically, terminals are made of highly conductive metal materials to ensure smooth current conduction. Simultaneously, the terminal design must consider compatibility and sealing with components such as the cell and casing to prevent electrolyte leakage and the entry of external impurities into the battery. In summary, the terminals on the battery cell are key components in the battery structure, playing a role in current conduction and incorporating various safety features to protect the battery and the user. During the design and manufacturing process, strict control over the material, structure, and process quality of the terminals is necessary to ensure battery performance and reliability. Specifically, to ensure the terminal can smoothly pass through the terminal hole 15, a second clearance groove 25 is provided to increase the welding distance between the second side 22 and the first side 12, preventing deformation of the terminal hole 15 during welding and thus ensuring the terminal can pass through the terminal hole 15. Furthermore, when the second side surface 22 is welded to the first side surface 12, the heat generated during welding causes the second side surface 22 to deform. At this time, the distance between the edge of the pole hole 15 and the edge of the second clearance groove 25 can accommodate the deformation, preventing the second side surface 22 from obstructing the pole hole 15 and thus avoiding the problem of the pole not being able to pass through the pole hole 15. The edge 18 of the pole hole refers to the outer edge line of the pole hole 15 on the inner surface of the first side surface 12. The edge 29 of the second clearance groove refers to the outer edge line of the second clearance groove 25 formed on the second side surface 22.

[0036] According to some embodiments of this utility model, the edge of the first side surface 12 away from the bottom surface 11 is flush. This prevents part of the first side surface 12 from protruding from the top surface 21.

[0037] According to some embodiments of this utility model, the second welding area 26 is disposed along the edge of the second side surface 22 away from the top surface 21. The width of the second welding area 26 is not greater than 0.5 mm and not less than 0.1 mm. This avoids deformation of the second welding area 26, which could cause large deformation of the second side surface 22 and the first side surface 12. It also avoids the second welding area 26 being too small, which could cause difficulties in welding operations and weak welds. Furthermore, the distance between the second welding area 26 and the top surface 21 is not less than 0.5 mm, further preventing large deformation of the second side surface 22 and the first side surface 12 due to deformation of the second welding area 26.

[0038] According to some embodiments of this utility model, the thickness of the first side 12 is greater than the thickness of the second side 22. The second side 22 is the side of the first side 12 that faces away from the battery cell. When the first side 12 deforms, it directly affects the battery cell. However, when the second side 22 deforms, it is blocked by the first side 12 and cannot directly affect the battery cell. During the welding process, a larger structural thickness makes deformation less likely, while a smaller structural thickness makes deformation more likely. Therefore, setting the thickness of the first side 12 to be greater than the thickness of the second side 22 reduces the impact on the battery cell.

[0039] According to some embodiments of this utility model, an insulating element 3 is provided inside the electrode hole 15. The insulating element 3 is used to isolate the electrode from the first side surface 12. The insulating element 3 is provided to prevent short circuits between the electrode and the housing, and to prevent damage to the electrode and housing after contact between them. The insulating element 3 not only prevents short circuits but also protects the electrode and housing from damage.

[0040] According to some embodiments of this utility model, the battery cell is disposed within the first receiving groove 13, and the battery cell does not extend beyond the opening of the first receiving groove 13. This avoids the second housing 2 compressing the battery cell when the second housing 2 is disposed.

[0041] The battery according to a second aspect of the present invention includes a casing and a cell as described in any of the above embodiments.

[0042] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A housing for accommodating a battery cell, characterized in that, The housing includes: A first housing, the first housing includes a bottom surface and a first side surface, the first side surface is fixedly connected to the bottom surface, the first side surface surrounds the edge of the bottom surface and forms a first receiving groove with the bottom surface; The second housing includes a top surface and a second side surface, the second side surface being fixedly connected to the top surface, and the second side surface surrounding the edge of the top surface and forming a second receiving groove with the top surface. The opening of the second receiving groove is accommodated within the first receiving groove. The first side includes a first welding area and a limiting part. The limiting part is disposed between the first welding area and the bottom surface, and the limiting part abuts against the opening of the second receiving groove. The thickness of the first welding area is A, and the thickness of the limiting part is B. <B; The second side includes a second welding area. Along the thickness direction of the second side, the second welding area overlaps with the first welding area to form a welding area. The thickness of the second side is C, and the thickness of the welding area is D, where C+A≤D≤C+B.

2. The housing according to claim 1, characterized in that, An injection hole is provided on the first side, and the injection hole penetrates the first side. A first clearance groove is provided on the second side. Along the thickness direction of the second side, the first clearance groove corresponds to the injection hole. The distance between the edge of the injection hole and the edge of the first clearance groove is not less than 0.5 mm.

3. The housing according to claim 1, characterized in that, The first side has a pole hole that penetrates through the first side. The second side has a second clearance groove that corresponds to the pole hole along the thickness direction of the second side. The distance between the edge of the pole hole and the edge of the second clearance groove is not less than 0.5 mm.

4. The housing according to claim 1, characterized in that, The edge of the first side away from the bottom surface is flush.

5. The housing according to claim 1, characterized in that, The second welding area is provided along the edge of the second side away from the top surface, and the width of the second welding area is not greater than 0.5 mm and not less than 0.1 mm.

6. The housing according to claim 1, characterized in that, The thickness of the limiting part is greater than the thickness of the second side.

7. The housing according to claim 6, characterized in that, At least one of the following conditions must be met: 0.05mm≤B≤0.3mm, 1mm≤C, or D≤2mm.

8. The housing according to claim 3, characterized in that, An insulating element is provided inside the electrode post hole, which is used to isolate the electrode post from the first side surface.

9. The housing according to claim 1, characterized in that, The distance between the second welding area and the top surface is not less than 0.5 mm.

10. A battery, characterized in that, It includes the housing and the battery cell as described in any one of claims 1-9.

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