Battery shell and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery shell and a battery. The battery shell comprises a packaging shell and an end plate, a mounting cavity is formed in the packaging shell, an opening is formed in the end of the packaging shell and communicated with the mounting cavity, the opening is covered with the end plate in a sealing mode, a stamping groove is formed in the side, away from the mounting cavity, of the end plate, and a positioning protrusion is arranged on the side, facing the mounting cavity, of the surface of the end plate in a protruding mode; a plurality of positioning protrusions are arranged in the circumferential direction of the end plate at intervals along the central axis of the packaging shell, and the multiple positioning protrusions are tightly attached to the inner wall of the packaging shell. By means of the positioning protrusions, the end plate can be clamped at the opening of the packaging shell, it is ensured that no relative displacement is generated between the end plate and the packaging shell after assembly and in the welding process, the length of the binding face between the end plate and the opening end face of the packaging shell can meet the fusion depth requirement needed by side welding, the welding quality is guaranteed, and the service life of the end plate is prolonged. The structural strength and the flatness of the end plate are improved, and the production and manufacturing difficulty is reduced.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery casing and a battery. Background Technology

[0002] After the large round shell is stretched and formed, all the stress is concentrated at the opening of the shell. Since the junction of the opening end face and the inner side wall is semi-circular, it cannot meet the requirements of the side welding process after the shell and the bottom plate are assembled. At this time, it is necessary to spin cut the opening of the shell to remove the semi-circular part. However, this will cause the stress release to cause the opening to expand outward, making the bottom opening of the shell flared.

[0003] To improve the positioning accuracy between the base plate and the casing and ensure welding quality, existing technologies often employ a large-section circular or annular boss protruding from the surface of the base plate towards the internal cavity of the casing. The close contact between the boss and the inner wall of the casing achieves positioning of the base plate, ensuring weld penetration and avoiding risks such as incomplete welds. However, the base plates provided by these existing technologies often suffer from poor flatness due to excessive material extrusion, which affects the overall assembly accuracy of the battery and increases production costs.

[0004] Based on the above, there is an urgent need to design a battery casing and battery to solve the problems existing in the prior art. Utility Model Content

[0005] The purpose of this utility model is to provide a battery casing and a battery that can solve the problem of poor flatness of the bottom plate in existing battery casings, thereby achieving the technical effect of improving the assembly accuracy of the battery and reducing production costs.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The battery casing includes a package housing and an end plate. The package housing has an internal mounting cavity and an opening at one end of the package housing that communicates with the mounting cavity. The end plate is sealed over the opening. The end plate has a stamping groove on the side facing away from the mounting cavity, and a positioning protrusion is provided on the side of the end plate facing the mounting cavity. Along the central axis of the package housing, the end plate has a plurality of positioning protrusions spaced circumferentially, and the plurality of positioning protrusions are all tightly fitted to the inner wall of the package housing.

[0008] Preferably, the number of positioning protrusions is n, where 3 ≤ n ≤ 8.

[0009] Preferably, the number of positioning protrusions is n = 8.

[0010] Preferably, the battery casing is a cylindrical casing, and the positioning protrusion is a cylinder or a semi-cylinder, with the arc-shaped surface of the positioning protrusion tightly fitted to the inner wall of the encapsulation casing; or...

[0011] The battery casing is a square casing, and the positioning protrusion is a cylinder, a cube, or a semi-cylinder.

[0012] Preferably, the positioning protrusion is tightly fitted to the inner wall of the packaging shell by an interference fit.

[0013] Preferably, the opening is funnel-shaped, and the inner diameter of the encapsulation housing gradually increases along the direction from the mounting cavity to the opening.

[0014] Preferably, the interference fit k between the positioning protrusion and the inner wall of the package housing at the large-diameter end of the opening is 0.05mm≤k≤0.1mm.

[0015] Preferably, the depth of the stamping groove is a, the thickness of the end plate is b, and the relationship between a and b is: 0.5≤a / b≤0.9.

[0016] Preferably, the diameter of the end plate is d1, the diameter of the stamping groove is d2, and the relationship between d1 and d2 is: 0.03≤d2 / d1≤0.05.

[0017] The battery includes an electrode assembly, a top cover assembly, and the aforementioned battery casing. Both ends of the battery casing have openings communicating with a mounting cavity. The electrode assembly is housed within the mounting cavity. The top cover assembly is sealed over one of the openings and electrically connected to the electrode assembly. The end plate of the battery casing is sealed over the other opening.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] This embodiment provides a battery casing, which includes an encapsulation shell and an end plate. By forming a positioning protrusion on the end plate, the end plate can be clamped at the opening of the encapsulation shell, ensuring that there is no relative displacement between the end plate and the encapsulation shell after assembly and during welding. This ensures that the length of the mating surface between the end plate and the opening end face of the encapsulation shell can meet the penetration depth requirements of side welding, guaranteeing welding quality, improving the structural strength and flatness of the end plate, and reducing manufacturing difficulty.

[0020] This embodiment also provides a battery. During the battery manufacturing process, by using the aforementioned battery casing, and because the end plate of the battery casing is provided with positioning protrusions that fit tightly against the inner wall of the encapsulation shell, the positioning protrusions effectively position and restrict the end plate on the encapsulation shell. This solves the problem of the end plate moving relative to the encapsulation shell during the welding process, thereby ensuring the welding quality of the end plate and the encapsulation shell at the mating surface. Furthermore, it ensures good flatness and structural strength of the end plate, improves the overall safety of the battery casing, and thus improves the overall performance and reliability of the battery, resulting in a longer service life. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the battery structure provided in an embodiment of the present invention;

[0022] Figure 2 This is a partial exploded view of the battery structure provided in this embodiment of the utility model;

[0023] Figure 3 This is a top view of the battery provided in an embodiment of the present utility model;

[0024] Figure 4 It is along Figure 3 Sectional view of AA;

[0025] Figure 5 yes Figure 4 A magnified view of a section at point B in the middle;

[0026] Figure 6 This is a schematic diagram of the end plate provided in an embodiment of the present utility model.

[0027] In the picture:

[0028] 10. Battery casing; 20. Top cover assembly;

[0029] 1. Encapsulation housing; 11. Mounting cavity; 12. Opening;

[0030] 2. End plate; 21. Stamping groove; 22. Positioning protrusion. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0032] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0035] The technical solution provided by this utility model will be described in detail below with reference to the appendages and specific embodiments.

[0036] Combination Figures 1 to 6 As shown, this embodiment provides a battery casing 10, which includes an encapsulation housing 1 and an end plate 2. The encapsulation housing 1 has an internal mounting cavity 11, and an opening 12 at its end, which communicates with the mounting cavity 11. The end plate 2 is sealed over the opening 12 to close the end opening 12 of the encapsulation housing 1. To meet the requirements of the side welding process after assembly of the encapsulation housing 1 and the end plate 2, this embodiment refers to... Figure 2As shown, before molding, the inner wall of the encapsulation shell 1 facing the opening 12 of the end plate 2 is precisely cut by using a rotary cutting tool to form a trumpet-shaped opening 12 with an inner diameter that gradually increases along the axial direction of the encapsulation shell 1 at a certain depth. This removes the semi-circular arc-shaped structure at the junction of the end face of the opening 12 and the inner side wall. When the end plate 2 is assembled on the encapsulation shell 1 after molding, the end face of the opening 12 of the encapsulation shell 1 can ensure a tight fit with the mating surface of the end plate 2, ensuring no gap during the welding process, thereby meeting the precision requirements of the side welding process for the assembly of the encapsulation shell 1 and the end plate 2.

[0037] To achieve the positioning and assembly of the end plate 2 on the packaging shell 1, in this embodiment, a stamping groove 21 is provided on the side of the end plate 2 facing away from the mounting cavity 11. A positioning protrusion 22 is formed on the side of the end plate 2 facing the mounting cavity 11 through stamping. Multiple stamping grooves 21 are spaced circumferentially along the central axis of the packaging shell 1, forming multiple positioning protrusions 22 on the end plate 2 that can tightly fit against the inner wall of the packaging shell 1. The positioning protrusions 22 secure the end plate 2 at the opening 12 of the packaging shell 1, ensuring no relative displacement between it and the packaging shell 1 after assembly and during welding. This ensures that the contact surface length between the end plate 2 and the opening 12 end face of the packaging shell 1 meets the required penetration depth for side welding, thereby avoiding problems such as incomplete welding and guaranteeing welding quality. In addition, in this embodiment, multiple stamping grooves 21 are formed on the end plate 2 by single-point stamping. Compared with the method of forming stamping grooves 21 by full-circle stamping, the impact on the flatness of the end plate 2 is reduced, the structural strength and flatness of the end plate 2 are improved, and the manufacturing complexity, difficulty and production cost are also reduced, which is conducive to the promotion of this end plate 2 in the battery manufacturing process.

[0038] Furthermore, in this embodiment, the positioning protrusion 22 is tightly fitted to the inner wall of the packaging shell 1 by an interference fit, so as to eliminate the tiny gap between the positioning protrusion 22 and the inner wall of the packaging shell 1, ensure a firm connection, prevent loosening caused by vibration or thermal expansion, and further improve the positioning effect of the positioning protrusion 22 on the end plate 2.

[0039] In this embodiment, reference Figure 5As shown, the interference fit between the positioning protrusion 22 and the inner wall of the large-diameter end of the packaging shell 1 at the opening 12 is set as k. The value of k should satisfy the following range: 0.05mm ≤ k ≤ 0.1mm. When k is less than 0.05mm, the mating surface length between the end plate 2 and the end face of the opening 12 will be too short, which will not meet the penetration depth required for side welding and affect the welding quality. When k is greater than 0.1mm, the excessive interference fit may cause assembly difficulties or even damage to the packaging shell 1. Therefore, reasonably controlling the value of k can ensure a tight fit between the end plate 2 and the packaging shell 1, and avoid assembly problems and welding quality problems. In actual use, k can be 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, etc.

[0040] Exemplarily, in this embodiment, the battery casing 10 is used in a cylindrical battery, and correspondingly, the encapsulation housing 1 is a cylindrical housing for encapsulating the columnar electrode assembly, and correspondingly, the end plate 2 is a circular plate. Preferably, combined with Figure 3 , Figure 6 As shown, the positioning protrusion 22 provided in this embodiment is a cylinder, so that the arc-shaped surface of the positioning protrusion 22 can cooperate with the arc-shaped inner wall of the packaging shell 1, so that the positioning protrusion 22 and the inner wall of the packaging shell 1 have good fit, thereby improving the positioning effect of the positioning protrusion 22 on the end plate 2. It should be noted that in other alternative embodiments, the positioning protrusion 22 provided in this embodiment can also be a semi-cylinder. In this case, the stamping groove 21 is semi-circular, and the arc-shaped surface of the semi-cylinder positioning protrusion 22 fits against the inner wall of the packaging shell 1. Therefore, it can also meet the requirement of tight fit between the positioning protrusion 22 and the arc-shaped inner wall of the packaging shell 1. Therefore, the shape of the positioning protrusion 22 is not limited in this embodiment.

[0041] Of course, in other parallel embodiments, the battery casing 10 can also be applied to a square battery, and the corresponding encapsulation housing 1 is a square housing, such as a rectangle or a square. The shape of the positioning protrusion 22 includes, but is not limited to, a cylinder, a cuboid, or a semi-cylinder. When the shape of the positioning protrusion 22 is a semi-cylinder, the arc-shaped surface or the flat surface of the positioning protrusion 22 can fit against the inner wall of the encapsulation housing 1, and a good fitting effect can be achieved.

[0042] Optionally, the number of positioning protrusions 22 on the end plate 2 is n, where n satisfies: 3 ≤ n ≤ 8. If the number of positioning protrusions 22 exceeds 8, that is, the number of stamping grooves 21 on the end plate 2 exceeds 8, the flatness of the end plate 2 will decrease, the structural strength of the end plate 2 will be weak, and it will be detrimental to the stability and welding quality of the end plate 2. If the number of positioning protrusions 22 is less than 3, that is, the number of stamping grooves 21 on the end plate 2 is less than 3, it is insufficient to ensure the stability of the end plate 2 within the packaging shell 1, and there is still a possibility of relative displacement between the end plate 2 and the shell, thereby affecting the welding effect. By controlling the number of positioning protrusions 22 to within 3-8, it is possible to effectively ensure that the end plate 2 still has good flatness and aesthetics, ensure the superior structural strength of the end plate 2, and also ensure the welding quality between the end plate 2 and the packaging shell 1, avoiding problems such as incomplete welding and missing welding during the welding process. For example, the number of positioning protrusions 22 can be 3, 4, 5, 6, 7 or 8, and this utility model is not limited to this. Preferably, in this embodiment, the number of positioning protrusions 22 is set to 8.

[0043] Furthermore, in this embodiment, reference is made to... Figure 5 As shown, the depth of the stamping groove 21 (i.e., the vertical distance between the bottom of the stamping groove 21 and the opening 12 of the stamping groove 21) is set to 'a', and the thickness of the end plate 2 is set to 'b'. The relationship between 'a' and 'b' is: 0.5 ≤ a / b ≤ 0.9. It should be noted that in actual use, if a / b is less than 0.5, the depth of the stamping groove 21 will be too small, resulting in a short protrusion length of the positioning protrusion 22 and a small contact area between the positioning protrusion 22 and the inner wall of the packaging shell 1, which may lead to the positioning protrusion 22 being unable to perform effective positioning. On the other hand, if a / b is greater than 0.9, the depth of the stamping groove 21 will be too large, which may cause the end plate 2 to be easily broken during the stamping process, resulting in the end plate 2 being scrapped and needing to be remanufactured. This result will not only increase production costs but also prolong the production cycle and affect overall efficiency. Therefore, by controlling a / b between 0.5 and 0.9, it is possible to ensure that the length of the positioning protrusion 22 is sufficient to achieve a stable connection with the inner wall of the packaging housing 1, while also preventing the end plate 2 from being damaged during processing, which would increase costs.

[0044] For example, in this embodiment, the ratio a / b of the depth of the stamping groove 21 to the thickness of the end plate 2 is set to 0.9, the thickness of the end plate 2 is b = 1.1 mm, and the depth of the stamping groove 21 is a = 0.99 mm. Of course, in other parallel embodiments, a / b can also be 0.5, 0.6, 0.7, 0.8, etc., and this utility model is not limited to this.

[0045] Furthermore, in this embodiment, reference is made to... Figure 3As shown, the diameter of end plate 2 is set as d1, and the diameter of stamping groove 21 is set as d2. The relationship between d1 and d2 is: 0.03≤d2 / d1≤0.05. When the ratio between d2 and d1 is less than 0.03, that is, when the diameter of the stamped positioning protrusion 22 is too small, the positioning protrusion 22 may lack sufficient strength due to its small diameter, affecting its stability and reliability during the welding process. When the ratio between d2 and d1 is greater than 0.05, that is, when the inner diameter of stamping groove 21 is too large, it may lead to an excessive proportion of multiple stamping grooves 21 on end plate 2, resulting in a reduction in the overall structural strength of end plate 2. If the ratio between the diameter d2 of stamping groove 21 and the diameter d1 of end plate 2 is controlled between 0.03 and 0.05, the purpose of improving the structural strength of positioning protrusion 22 and end plate 2 can be achieved simultaneously, thereby improving the welding quality and the safety and reliability of end plate 2 in use. d2 / d1 can be 0.03, 0.04, 0.05, etc., and this utility model does not limit it in this way.

[0046] Combination Figures 1 to 4 As shown, this embodiment also provides a battery, specifically a cylindrical battery, including an electrode assembly wound into a cylindrical shape, a top cover assembly 20 with a circular horizontal cross-section, and a battery casing 10 provided in the above embodiment. The electrode assembly is housed within a mounting cavity 11. It is understood that the battery casing 10 provided in this embodiment has openings 12 at both ends that communicate with the mounting cavity 11. The top cover assembly 20 is sealed over one of the openings 12 and electrically connected to the electrode assembly within the mounting cavity 11. The end plate 2 of the battery casing 10 is sealed over the other opening 12, so that the electrode assembly is encapsulated within the mounting cavity 11 by the end plate 2 and the top cover assembly 20.

[0047] By configuring the battery casing 10 as described above, during the production and assembly process, the positioning protrusion 22 on the end plate 2 fits tightly against the inner wall of the encapsulation shell 1, thus positioning and restricting the end plate 2 onto the encapsulation shell 1. This solves the problem of the end plate 2 moving relative to the encapsulation shell 1 during the welding process, thereby ensuring the welding quality of the end plate 2 and the encapsulation shell 1 at the mating surface. It also ensures good flatness and structural strength of the end plate 2, improves the overall safety of the battery casing 10, and thus improves the overall performance and reliability of the battery, resulting in a longer service life.

[0048] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0049] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery casing, characterized in that, The package includes a housing (1) and an end plate (2). The housing (1) has an internal mounting cavity (11). The end of the housing (1) has an opening (12) that communicates with the mounting cavity (11). The end plate (2) is sealed over the opening (12). The end plate (2) has a stamping groove (21) on the side away from the mounting cavity (11) to provide a positioning protrusion (22) on the side of the end plate (2) facing the mounting cavity (11). Along the central axis of the housing (1), the end plate (2) is circumferentially spaced with a plurality of positioning protrusions (22), and the plurality of positioning protrusions (22) are all tightly fitted to the inner wall of the housing (1).

2. The battery casing according to claim 1, characterized in that, The number of positioning protrusions (22) is n, where 3 ≤ n ≤ 8.

3. The battery casing according to claim 2, characterized in that, The number of positioning protrusions (22) is n = 8.

4. The battery casing according to claim 1, characterized in that, The battery casing (10) is a cylindrical casing, and the positioning protrusion (22) is a cylinder or a semi-cylinder, with the arc-shaped surface of the positioning protrusion (22) closely fitting the inner wall of the encapsulation casing (1); or, The battery casing (10) is a square casing, and the positioning protrusion (22) is a cylinder, a cube, or a semi-cylinder.

5. The battery casing according to claim 1, characterized in that, The positioning protrusion (22) is tightly fitted to the inner wall of the packaging shell (1) by means of interference fit.

6. The battery casing according to claim 5, characterized in that, The opening (12) is flared, and the inner diameter of the encapsulation housing (1) gradually increases along the direction from the mounting cavity (11) to the opening (12).

7. The battery casing according to claim 6, characterized in that, The interference fit k of the positioning protrusion (22) and the inner wall of the encapsulation housing (1) at the large diameter end of the opening (12) is 0.05mm≤k≤0.1mm.

8. The battery casing according to claim 1, characterized in that, The depth of the stamping groove (21) is a, and the thickness of the end plate (2) is b. The relationship between a and b is: 0.5≤a / b≤0.

9.

9. The battery casing according to claim 8, characterized in that, The diameter of the end plate (2) is d1, and the diameter of the stamping groove (21) is d2. The relationship between d1 and d2 is: 0.03≤d2 / d1≤0.

05.

10. A battery, characterized in that, The battery housing (10) includes an electrode assembly, a top cover assembly (20), and a battery casing (10) according to any one of claims 1-9. The battery casing (10) has openings (12) at both ends that communicate with a mounting cavity (11). The electrode assembly is housed in the mounting cavity (11). The top cover assembly (20) is sealed over one of the openings (12) and electrically connected to the electrode assembly. The end plate (2) of the battery casing (10) is sealed over the other opening (12).

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