Battery packaging structure, battery and electric device

Abstract

The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to a battery packaging structure, a battery and an electric device. The shell is provided with a first direction and an opening in the first direction, the cover plate is arranged on the opening, and a containing cavity is defined by the shell and the cover plate; one of the side wall of the opening and the cover plate is provided with a convex structure, the other one of the side wall of the opening and the cover plate is provided with a concave structure, and the convex structure is matched with the concave structure in a concave-convex manner. According to the utility model, by optimizing the packaging structure, the problem of deviation during welding of the shell is solved, and the welding accuracy is improved, so that the sealing performance of the battery is improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of battery manufacturing, specifically relating to a battery packaging structure, a battery, and an electrical device. Background Technology

[0002] Today, lithium-ion batteries, as a new type of rechargeable battery, have advantages such as high energy density and power density, high operating voltage, light weight, small size, long cycle life, good safety, and environmental friendliness. They have broad application prospects in portable electrical appliances, power tools, large-scale energy storage, and electric transportation power supplies.

[0003] Existing steel-cased batteries include a positive electrode casing and a negative electrode casing. One of the positive electrode casing and the negative electrode casing has a flange or protrusion, and the other of the positive electrode casing and the negative electrode casing is welded to the flange to achieve the connection between the positive electrode casing and the negative electrode casing.

[0004] In the process of developing this utility model, the inventors discovered at least the following problems in the prior art.

[0005] The existing casing uses a smooth flat flange structure, and there are no other components to fix the casing flange to the cover plate. This makes it easy for misalignment to occur during welding, resulting in a decrease in welding accuracy and thus affecting the battery's sealing performance. Utility Model Content

[0006] One of the objectives of this invention is to provide a battery packaging structure that addresses the shortcomings of existing technologies. By optimizing the packaging structure, the problem of misalignment during casing welding is solved, which helps to improve welding accuracy and thus improves the battery's sealing performance.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A battery encapsulation structure includes a housing and a cover plate; the housing has a first direction and an opening in the first direction, the cover plate is disposed on the opening, and the housing and the cover plate form a receiving cavity; one of the sidewalls of the opening and the cover plate is provided with a protruding structure, and the other of the sidewalls of the opening and the cover plate is provided with a recessed structure, the protruding structure and the recessed structure engaging in a convex-concave fit.

[0009] In some possible implementations, the cover plate has a second direction perpendicular to the first direction, the cover plate extends along the second direction to form a plurality of the protruding structures, and the sidewalls of the opening are correspondingly provided with a plurality of the recessed structures.

[0010] In some possible implementations, the protruding structures are spaced apart and arranged around the edge of the cover plate, and the recessed structures are spaced apart and arranged around the sidewall of the opening.

[0011] In some possible implementations, the ratio of the height of the protrusion to the thickness of the sidewall is 0.8 to 2, and the ratio of the depth of the recess to the thickness of the cover plate is 0.8 to 2.

[0012] In some possible implementations, the housing includes a bottom and sidewalls extending upward from the bottom to form the opening, and a cover plate covering the opening.

[0013] In some possible implementations, the sidewall is provided with an electrode hole and an injection hole.

[0014] In some possible implementations, both the housing and the cover plate have square cross-sections, and the corners of both the housing and the cover plate have rounded transitions. The thickness of the housing is 0.03 to 0.5 mm.

[0015] In some possible implementations, the cover plate has a plurality of protruding structures formed along the first direction on the side facing the opening, and the sidewall of the opening is provided with a plurality of recessed structures.

[0016] The second objective of this utility model is to provide a battery, including the aforementioned battery packaging structure.

[0017] The third objective of this utility model is to provide an electrical device, including the aforementioned battery.

[0018] One of the above technical solutions has the following beneficial effects.

[0019] This application utilizes a tenon-and-mortise connection between a raised and recessed structure to connect the sidewall of the housing opening and the cover plate. This enhances the stability and mechanical reliability between the housing and the cover plate, resulting in a more stable weld surface and improved weld quality. Simultaneously, it prevents weld positioning misalignment caused by housing compression or changes in work position, ensuring the weld seals the connection surface and improving battery sealing performance. Furthermore, compared to flange welding, the tenon-and-mortise connection eliminates the flange structure, reducing the overall housing thickness and saving battery assembly space, thereby increasing battery energy density. Additionally, laser welding can be directly performed on the weld surface after the tenon-and-mortise connection, offering advantages such as simple operation and convenient assembly, thus improving battery assembly efficiency and reducing equipment energy consumption and labor costs. Attached Figure Description

[0020] The features, advantages and technical effects of exemplary embodiments of the present invention will now be described with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] Figure 2for Figure 1 The diagram at point A in the figure.

[0023] Figure 3 This is an exploded view of the present invention.

[0024] Figure 4 This is an exploded view of another embodiment of the present invention.

[0025] The reference numerals in the attached figures are explained as follows:

[0026] 1-Shell;

[0027] 2-Cover plate; 10-Opening; 11-Pole post hole; 12-Injection hole;

[0028] 3-Protruding structure;

[0029] 4-Concave structure;

[0030] X - First direction; Y - Second direction. Detailed Implementation

[0031] If certain terms are used in the specification and claims to refer to specific components, those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" as used throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to." "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error.

[0032] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be interpreted as indicating or implying relative importance.

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] The present invention will be further described in detail below with reference to the accompanying drawings, but this is not intended to limit the present invention.

[0035] See Figures 1-3As shown, the embodiment provides a battery packaging structure, including a housing 1 and a cover plate 2. The housing 1 has a first direction X and an opening 10 in the first direction X. The cover plate 2 is disposed on the opening 10, and the housing 1 and the cover plate 2 form a receiving cavity. The first direction X is parallel to the side wall of the housing 1, i.e., the thickness direction of the housing 1. One end of the housing 1 in the first direction X is the top, and the top has the opening 10. The other end of the housing 1 in the first direction X is the bottom, and the bottom and side wall are integrally formed. The cover plate 2 serves to close the housing 1, and the housing 1 and the cover plate 2 form a space for receiving the core. The housing 1 can be formed by stamping and stretching, and after trimming, cleaning, and drying, a housing 1 with an integrally formed bottom and side wall and an opening 10 at the top is obtained. The cover plate 2 with protruding structures 3 on all four sides can be prepared by stamping. The outer diameter of the cover plate 2 is slightly smaller than the outer diameter of the opening 10 to ensure that the cover plate 2 can be fully embedded in the opening 10.

[0036] In this embodiment, one of the sidewall of the opening 10 and the cover plate 2 is provided with a protruding structure 3, and the other of the sidewall of the opening 10 and the cover plate 2 is provided with a recessed structure 4. The protruding structure 3 and the recessed structure 4 are fitted together. Thus, the protruding structure 3 and the recessed structure 4 can be mortised and tenoned together.

[0037] Compared to existing housings with smooth, flat flanges and no other components to fix the flange to the cover plate, which can easily lead to misalignment during welding, this application uses a tenon-and-mortise connection between the raised structure 3 and the recessed structure 4 to connect the side wall of the opening 10 of the housing 1 and the cover plate 2. This improves the stability and mechanical reliability between the housing 1 and the cover plate 2, making the weld surface more stable and improving weld quality. Simultaneously, it avoids welding positioning misalignment caused by housing compression or changes in work position, ensuring the weld seals the connection surface and improving battery sealing performance. Furthermore, the tenon-and-mortise connection eliminates the flange structure compared to flange welding, reducing the overall thickness of the housing 1, saving battery assembly space, and thus increasing battery energy density. After the tenon-and-mortise connection, laser welding can be performed directly on the weld surface, offering advantages such as simple operation and convenient assembly, thereby improving battery assembly efficiency and reducing equipment energy consumption and labor costs.

[0038] The cover plate 2 has a second direction Y perpendicular to the first direction X. The second direction Y includes, but is not limited to, the length direction of the cover plate 2, and can be the width direction of the cover plate 2. It can also include both the length direction and the width direction of the cover plate 2, that is, the length direction and the width direction of the cover plate 2 can both be provided with protruding structures 3, such as multiple protruding structures 3 surrounding the edge of the cover plate 2. There is no limitation here.

[0039] In this embodiment, the cover plate 2 extends along the second direction Y to form a plurality of protruding structures 3, and the sidewall of the opening 10 is provided with a plurality of recessed structures 4. The protruding structures 3 and the recessed structures 4 are mortised and tenoned together to realize the connection between the sidewall of the opening 10 of the housing 1 and the cover plate 2.

[0040] Furthermore, a recess is formed between two adjacent protruding structures 3 of the cover plate 2, and a protrusion is formed between two adjacent recessed structures 4 of the sidewall of the opening 10. The recess of the cover plate 2 and the protrusion of the sidewall of the opening 10 are riveted together.

[0041] In other embodiments, the edge of the cover plate 2 may also be provided with protruding structures 3 and recessed structures 4 at intervals. Correspondingly, the sidewall of the opening 10 of the housing 1 may also be provided with recessed structures 4 and protruding structures 3 at intervals. That is, the protruding structure 3 of the cover plate 2 is mortised and tenoned with the recessed structure 4 of the sidewall of the opening 10, and the recessed structure 4 of the cover plate 2 is riveted and connected with the protruding structure 3 of the sidewall of the opening 10 of the housing 1, which can also realize the connection between the sidewall of the opening 10 of the housing 1 and the cover plate 2.

[0042] Preferably, the protruding structures 3 are spaced apart and arranged around the edge of the cover plate 2, and the recessed structures 4 are spaced apart and arranged around the sidewall of the opening 10. Thus, the connection between the sidewall of the opening 10 of the housing 1 and the cover plate 2 can be achieved through the tenon-and-mortise connection between the protruding structures 3 and the recessed structures 4. The spaced distribution of the protruding structures 3 includes, but is not limited to, an equally spaced distribution, and may also be non-equally spaced; no limitation is made here.

[0043] In other embodiments, multiple protrusions 3 are spaced apart at both ends of the cover plate 2 in the length or width direction, and multiple recesses 4 are correspondingly provided on the sidewall of the opening 10. That is, the two ends of the cover plate 2 in the length or width direction are mortised and tenoned with the sidewall of the opening 10. The other directions of the cover plate 2 do not have protrusions 3, which can also realize the connection between the sidewall of the opening 10 of the housing 1 and the cover plate 2.

[0044] In this embodiment, the housing 1 includes a bottom and sidewalls. The sidewalls extend upward from the bottom and form an opening 10. A cover plate 2 covers the opening 10. The cover plate 2 serves to close the housing 1, and the housing 1 and the cover plate 2 form a space for accommodating the winding core. The bottom and sidewalls are integrally formed and can be formed by stamping and stretching. After trimming, cleaning, and drying, a housing 1 with an integrally formed bottom and sidewalls and an opening 10 at the top is obtained.

[0045] Preferably, the cross-sections of the shell 1 and the cover plate 2 are both square, and the corners of the shell 1 and the cover plate 2 are both arc-shaped transitions. However, this utility model is not limited to this. The cross-sections of the shell 1 and the cover plate 2 can be square, or they can be circular or other regular shapes. There are no restrictions here.

[0046] In this embodiment, the thickness of the housing 1 is 0.03–0.5 mm. This ensures that the housing 1 has sufficient mechanical strength while reducing its production cost.

[0047] Since a recess is formed between two adjacent protruding structures 3 of the cover plate 2, and a protrusion is formed between two adjacent recessed structures 4 of the sidewall of the opening 10, the recess of the cover plate 2 and the protrusion of the sidewall of the opening 10 are riveted together.

[0048] In some embodiments, the ratio of the height of the protruding structure 3 to the sidewall thickness is 0.8 to 2, that is, the recess of the cover plate 2 is 0.8 to 2 times the sidewall thickness, and the ratio of the depth of the recessed structure 4 to the thickness of the cover plate 2 is 0.8 to 2, that is, the protrusion of the sidewall of the housing 1 is 0.8 to 2 times the thickness of the cover plate 2. This avoids the situation where the riveting is not firm due to the ratio being too small. At the same time, the portion of the protruding structure 3 that extends beyond the edge at the connection can be fused by welding.

[0049] For example, in some embodiments, the ratio of the height of the protrusion structure 3 to the thickness of the sidewall is 0.8, 0.9, 1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, etc., and may also be any other value from 0.8 to 2.

[0050] In some embodiments, the sidewall is provided with a terminal hole 11 and an electrolyte injection hole 12. Both the terminal hole 11 and the electrolyte injection hole 12 are provided on the sidewall of the housing 1. The positive terminal is installed on the terminal hole 11, that is, the positive terminal is provided on the sidewall. After the battery is filled with electrolyte, the sealing pin is installed in the electrolyte injection hole 12 to prevent electrolyte leakage.

[0051] In other embodiments, see Figure 4 As shown, the cover plate 2 has multiple protruding structures 3 along the first direction X on the side facing the opening 10. That is, multiple protruding structures 3 are provided on the bottom edge of the cover plate 2, and multiple recessed structures 4 are provided on the side wall of the opening 10. The protruding structures 3 are spaced apart and arranged around the edge of the cover plate 2, and the recessed structures 4 are spaced apart and arranged around the side wall of the opening 10. At the same time, the outer diameter of the cover plate 2 is the same, and the connection between the side wall of the opening 10 of the shell 1 and the cover plate 2 is realized by the tenon and tenon connection between the protruding structures 3 and the recessed structures 4. This can improve the stability and mechanical reliability between the shell 1 and the cover plate 2, make the welding surface more stable, and improve the welding quality.

[0052] Battery

[0053] The battery includes a first electrode, a separator, and a second electrode. The first electrode, the separator, and the second electrode are sequentially wound to form a bare cell. At least one of the first electrode and the second electrode adopts the above-described structure.

[0054] The battery is packaged in an aluminum-plastic film or a metal shell, or other materials such as packaging shells or bags; there are no restrictions here.

[0055] A battery may include at least two electrodes stacked on top of each other with opposite polarities, which are the positive and negative electrodes of the battery, respectively. To prevent short circuits between the positive and negative electrodes, a separator is provided between each pair of adjacent electrodes, and the electrodes with opposite polarities are electrically isolated by the separator.

[0056] To prevent short circuits between the positive and negative electrodes, electrodes with opposite polarities are electrically isolated by a diaphragm. The first and second electrodes have opposite polarities and are stacked on top of each other.

[0057] The first electrode can be a positive electrode and the second electrode can be a negative electrode; or, the first electrode can be a negative electrode and the second electrode can be a positive electrode, without any restrictions.

[0058] Electrical appliances

[0059] Batteries incorporating the composite current collector structure of this invention can also be used in electrical devices, including automobiles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Automobiles can be gasoline-powered, natural gas-powered, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. This application does not impose any special limitations on the aforementioned electrical devices.

[0060] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments described above, and any obvious improvements, substitutions, or modifications made by those skilled in the art based on this utility model are within the protection scope of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A packaging structure of a battery, characterized by comprising: The battery comprises a shell (1) and a cover plate (2); The shell (1) has a first direction (X), the shell (1) has an opening (10) in the first direction (X), the cover plate (2) is arranged on the opening (10), and the shell (1) and the cover plate (2) enclose a containing cavity. One of the side wall of the opening (10) and the cover plate (2) is provided with a convex structure (3), and the other of the side wall of the opening (10) and the cover plate (2) is provided with a concave structure (4), and the convex structure (3) and the concave structure (4) are in convex-concave matching.

2. The battery packaging structure of claim 1, wherein: The cover plate (2) has a second direction (Y) perpendicular to the first direction (X), the cover plate (2) extends along the second direction (Y) to form a plurality of convex structures (3), and the side wall of the opening (10) is correspondingly provided with a plurality of concave structures (4).

3. The battery packaging structure of claim 2, wherein: The convex structures (3) are distributed at intervals and arranged around the edge of the cover plate (2), and the concave structures (4) are distributed at intervals and arranged around the side wall of the opening (10).

4. A battery packaging structure as claimed in claim 2 or 3, wherein: The shell (1) comprises a bottom and a side wall extending upward from the bottom, the side wall encloses the opening (10), and the cover plate (2) covers the opening (10).

5. The battery packaging structure of claim 4, wherein: The ratio of the height of the convex structure (3) to the thickness of the side wall is 0.8-2, and the ratio of the depth of the concave structure (4) to the thickness of the cover plate (2) is 0.8-2.

6. The battery packaging structure of claim 4, wherein: The side wall is provided with a pole hole (11) and a liquid injection hole (12).

7. A battery packaging structure as claimed in any one of claims 1 to 3, wherein: The cross section of the shell (1) and the cover plate (2) is square, the corners of the shell (1) and the cover plate (2) are arc-shaped transitions, and the thickness of the shell (1) is 0.03-0.5 mm.

8. The battery packaging structure of claim 1, wherein: The side of the cover plate (2) facing the opening (10) forms a plurality of convex structures (3) along the first direction (X), and the side wall of the opening (10) is correspondingly provided with a plurality of concave structures (4).

9. A battery characterized by: The battery comprises a shell (1) and a cover plate (2); 10. An electrical device, characterized by: The battery comprises a shell (1) and a cover plate (2);

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