Housing assembly and battery cell having same

Abstract

The utility model discloses a shell assembly and a battery monomer with the shell assembly, the shell assembly is used for the battery monomer and comprises a shell body, a top cover and an insulating film, the upper end of the shell body is provided with an opening, and the peripheral wall of the shell body is provided with a coating area and a non-coating area along the direction from bottom to top; the top cover covers the opening; the insulating film comprises a film body, a first folding part extending in the length direction of the film body and a second folding part extending in the width direction of the film body, the film body wraps the upper surface of the top cover, and at least parts of the first folding part and the second folding part wrap the non-coating area. According to the shell assembly provided by the utility model, when the top cover and the shell body are welded and connected, the non-coating area is close to the welding and connecting position of the top cover and the shell body, so that the connection between the top cover and the shell body can be prevented from being influenced by paint generated when the coating area is sprayed. And the first folding part and the second folding part can also bring a certain insulation effect to the non-coating area, so that the insulation effect of the shell body is improved.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of batteries, and particularly relates to a housing assembly and a battery cell having the same. Background Art

[0002] At present, the outer surface of the housing of the battery cell is coated with an insulating film and an insulating layer to provide insulation protection for the power battery. However, after spraying the insulating layer on the housing, the coating is likely to affect the connection between the housing and the top cover, which may result in a poor connection between the top cover and the housing. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a housing assembly which can avoid the paint generated during spraying in the coating area from affecting the connection between the top cover and the housing body while increasing the insulation effect of the housing body.

[0004] The utility model also provides a battery cell, which includes the above-mentioned housing assembly.

[0005] The housing assembly according to the embodiment of the utility model is used for a battery cell and includes a housing body, a top cover and an insulating film. The top end of the housing body is provided with an open mouth. Along the height direction of the housing body, the outer peripheral wall of the housing body is sequentially provided with a coating area and a non-coating area, and the non-coating area is close to the open mouth; the top cover is covered at the open mouth; the insulating film includes a film body, a first folding part extending along the length direction of the film body and a second folding part extending along the width direction of the film body. The film body covers the upper surface of the top cover, and at least part of the first folding part and the second folding part cover the non-coating area.

[0006] According to the housing assembly of the embodiment of the utility model, by covering the top cover at the open mouth at the upper end of the housing body, and along the direction from bottom to top, the outer peripheral wall of the housing body is provided with a coating area and a non-coating area. When the top cover is welded to the housing body, the non-coating area is close to the welding connection position between the top cover and the housing body, which can avoid the paint generated during spraying in the coating area from affecting the connection between the top cover and the housing body. The film body of the insulating film covers the upper surface of the top cover, and at least part of the first folding part and the second folding part of the insulating film cover the non-coating area, which can make the connection positions between the insulating film and the housing body and the top cover more, increase the reliability of the position of the insulating film, and the first folding part and the second folding part can also bring a certain insulating effect to the non-coating area, increasing the insulating effect of the housing body.

[0007] In some embodiments of the utility model, along the up and down direction, the size of the first folding part is L1 and satisfies: 2mm ≤ L1 ≤ 15mm.

[0008] In some embodiments of the present utility model, in the up-down direction, the size of the second folding portion is L2 and satisfies: 2 mm ≤ L2 ≤ 15 mm.

[0009] In some embodiments of the present utility model, a first crease is provided between the first folding portion and the film body, and the first crease extends along the width direction of the top cover; and / or, a second crease is provided between the second folding portion and the film body, and the second crease extends along the length direction of the top cover.

[0010] In some embodiments of the present utility model, along the circumferential direction of the housing assembly, the adjacent first folding portion and the second folding portion are spaced apart.

[0011] In some embodiments of the present utility model, in the height direction of the housing body, the size of the non-coated area is H and satisfies: 1 mm ≤ H ≤ 10 mm.

[0012] In some embodiments of the present utility model, the first folding portion and the second folding portion cover at least part of the coated area.

[0013] In some embodiments of the present utility model, a first through hole is provided on the film body, a pole post is provided on the top cover, the pole post protrudes from the upper surface of the top cover, and the pole post passes through the first through hole.

[0014] In some embodiments of the present utility model, a second through hole is provided on the film body, an explosion-proof valve is provided on the top cover, and the explosion-proof valve is disposed opposite to the second through hole.

[0015] The battery cell according to the embodiment of the present utility model includes the above-mentioned housing assembly and electrode group, the housing assembly defines an accommodation space; the electrode group is disposed in the accommodation space.

[0016] For the battery cell according to the embodiment of the present utility model, by covering the top cover at the open upper end of the housing body, and in the direction from bottom to top, the outer peripheral wall of the housing body is provided with a coated area and a non-coated area. When the top cover is welded to the housing body, the non-coated area is close to the welding connection position between the top cover and the housing body, which can avoid the influence of the coating during spraying on the connection between the top cover and the housing body. The film body of the insulating film covers the upper surface of the top cover, and at least part of the first folding portion and the second folding portion of the insulating film cover the non-coated area, which can make the connection positions between the insulating film and the housing body and the top cover more, increase the reliability of the position of the insulating film, and the first folding portion and the second folding portion can also bring a certain insulating effect to the non-coated area, increasing the insulating effect of the housing body.

[0017] The additional aspects and advantages of the present utility model will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present utility model. Brief Description of the Drawings

[0018] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, where:

[0019] Figure 1 is an exploded view of a housing assembly according to an embodiment of the present utility model;

[0020] Figure 2 is a perspective view of a housing assembly according to an embodiment of the present utility model;

[0021] Figure 3 is a perspective view of a housing body of a housing assembly according to an embodiment of the present utility model;

[0022] Figure 4 is a perspective view of an insulating film of a housing assembly according to an embodiment of the present utility model.

[0023] Reference Numerals:

[0024] 100, housing assembly;

[0025] 1, housing body; 11, open mouth; 12, accommodation space; 13, coating area; 14, non - coating area;

[0026] 2, top cover; 21, terminal post; 22, explosion - proof valve;

[0027] 3, insulating film; 31, film body; 311, first through - hole; 312, second through - hole; 32, first folding portion; 33, second folding portion. Detailed Description of the Embodiments

[0028] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0029] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0030] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0031] Next, reference is made to Figures 1 - 4 Describe the housing assembly 100 according to an embodiment of the present utility model.

[0032] As Figure 1 shown, the housing assembly 100 according to an embodiment of the present utility model includes a housing body 1, a top cover 2 and an insulating film 3.

[0033] Specifically, as Figure 1 and Figure 3 shown, an open mouth 11 is provided at the top end of the housing body 1. The housing assembly 100 can be used for a battery cell, and other components inside the battery cell can be loaded into the housing body 1 through the open mouth 11, increasing the reliability of the battery cell assembly.

[0034] Along the height direction of the housing body 1 (such as Figure 1 the up and down direction shown), as Figure 1 and Figure 3As shown, a coating area 13 and a non-coating area 14 are successively provided on the outer peripheral wall of the shell body 1. The non-coating area 14 is arranged close to the open mouth 11. The coating area 13 can coat an insulating layer on the shell body 1. The insulating layer can effectively prevent current from passing through the shell body 1 and avoid safety problems caused by current leakage. The insulating layer isolates the positive and negative electrodes of the battery cell from the external environment and reduces the short-circuit risk caused by external factors. The insulating layer can maintain the stability of the internal environment of the battery cell, reduce the influence of the external environment on the performance of the battery cell, and thus improve the performance and service life of the battery.

[0035] The top cover 2 is covered at the open mouth 11. The top cover 2 and the shell body 1 jointly encapsulate the battery cell and provide physical protection for other components inside the housing assembly 100.

[0036] When the top cover 2 is welded to the shell body 1, the non-coating area 14 is close to the welding connection position between the top cover 2 and the shell body 1, which can avoid the paint generated during the spraying of the coating area 13 from affecting the connection between the top cover 2 and the shell body 1.

[0037] As Figure 1 and Figure 4 shown, the insulating film 3 includes a film body 31, a first folding part 32 extending along the length direction of the film body 31 (such as Figure 1 the first direction shown) and a second folding part 33 extending along the width direction of the film body 31 (such as Figure 1 the second direction shown). As Figure 1 and Figure 2 shown, the film body 31 covers the upper surface of the top cover 2. The insulating film 3 can achieve a good insulating effect, prevent the battery cell from short-circuiting. At the same time, the insulating film 3 can also reduce the risk of the electrolyte inside the battery cell flowing out to the outside. The insulating film 3 can significantly improve the safety performance of the battery cell and reduce risks such as the battery cell catching fire and exploding. At least part of the first folding part 32 and the second folding part 33 cover the non-coating area 14, and at least part of the first folding part 32 and the second folding part 33 are attached to the shell body 1, which can make the connection positions between the insulating film 3 and the shell body 1 and the top cover 2 more, increase the reliability of the position of the insulating film 3, and the first folding part 32 and the second folding part 33 can also bring a certain insulating effect to the non-coating area 14 and increase the insulating effect of the shell body 1.

[0038] According to the housing assembly 100 of the embodiment of the present utility model, by covering the top cover 2 at the open opening 11 at the upper end of the housing body 1, and in the direction from bottom to top, the outer peripheral wall of the housing body 1 is provided with a coating area 13 and a non - coating area 14. When the top cover 2 is welded to the housing body 1, the non - coating area 14 is close to the welding connection position between the top cover 2 and the housing body 1, which can avoid the paint generated during the spraying of the coating area 13 from affecting the connection between the top cover 2 and the housing body 1. The film body 31 of the insulating film 3 covers the upper surface of the top cover 2, and at least part of the first folding part 32 and the second folding part 33 of the insulating film 3 cover the non - coating area 14, which can make the connection positions between the insulating film 3 and the housing body 1 and the top cover 2 more, increase the reliability of the position of the insulating film 3, and the first folding part 32 and the second folding part 33 can also bring a certain insulating effect to the non - coating area 14, increasing the insulating effect of the housing body 1.

[0039] In some embodiments of the present utility model, the size of the first folding part 32 is L1 and satisfies: 2mm ≤ L1 ≤ 15mm. It can be understood that the size L1 of the first folding part 32 can be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 10.5mm, 11mm, 11.5mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm, 14.5mm or 15mm. The size L1 of the first folding part 32 is not less than 2mm, which can ensure that there are certain connection positions between the insulating film 3 and the housing body 1 and the top cover 2, increasing the reliability of the position of the insulating film 3; the size L1 of the first folding part 32 is not greater than 15mm, which can avoid the large size of the first folding part 32 and the high manufacturing cost of the insulating film 3.

[0040] In some embodiments of the present utility model, the size of the second folding part 33 is L2 and satisfies: 2mm ≤ L2 ≤ 15mm. It can be understood that the size L2 of the second folding part 33 can be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 10.5mm, 11mm, 11.5mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm, 14.5mm or 15mm. The size L2 of the second folding part 33 is not less than 2mm, which can ensure that there are certain connection positions between the insulating film 3 and the housing body 1 and the top cover 2, increasing the reliability of the position of the insulating film 3; the size L2 of the second folding part 33 is not greater than 15mm, which can avoid the large size of the second folding part 33 and the high manufacturing cost of the insulating film 3.

[0041] In some embodiments of the present utility model, a first crease is provided between the first folding portion 32 and the film body 31. The first crease extends along the width direction of the top cover 2. The first folding portion 32 can be bent along the first crease towards the direction of the housing body 1, facilitating the fitting of the first folding portion 32 to the non-coated area 14 on the housing body 1.

[0042] In some embodiments of the present utility model, a second crease is provided between the second folding portion 33 and the film body 31. The second crease extends along the length direction of the top cover 2. The second folding portion 33 can be bent along the second crease towards the direction of the housing body 1, facilitating the fitting of the second folding portion 33 to the non-coated area 14 on the housing body 1.

[0043] In some embodiments of the present utility model, as Figure 1 and Figure 4 shown, along the circumferential direction of the housing assembly 100, the adjacent first folding portions 32 and second folding portions 33 are spaced apart. In the process of assembling the insulating film 3, the first folding portions 32 and the second folding portions 33 can be assembled simultaneously, and the fitting of the first folding portions 32 and the second folding portions 33 to the housing body 1 can be achieved simultaneously, so that the assembly efficiency of the insulating film 3 with the top cover 2 and the housing body 1 is relatively high.

[0044] In some embodiments of the present utility model, along the height direction of the housing body 1, the size of the non-coated area 14 is H and satisfies: 1 mm ≤ H ≤ 10 mm. It can be understood that the size H of the non-coated area 14 can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm or 10 mm. The size H of the non-coated area 14 is not less than 1 mm, which can prevent the paint generated during the spraying of the coated area 13 from affecting the connection between the top cover 2 and the housing body 1; the size H of the non-coated area 14 is not greater than 10 mm, which can prevent the size of the part of the housing body 1 not coated with the coating from being too large, and can minimize the influence of the non-coated area 14 on the insulation effect of the housing body 1.

[0045] In some embodiments of the present utility model, the first folding portions 32 and the second folding portions 33 cover at least part of the coated area 13, so that the parts of the first folding portions 32 and the second folding portions 33 that can exceed the non-coated area 14 can ensure that most of the non-coated area 14 is covered by the insulating film 3, increasing the insulation effect of the housing assembly 100.

[0046] In some embodiments of the present utility model, as Figure 1 、 Figure 2 and Figure 4As shown, a first through hole 311 is provided on the film body 31, and a pole column 21 is provided on the top cover 2. The pole column 21 protrudes from the upper surface of the top cover 2 and passes through the first through hole 311. The pole column 21 can be exposed outside the insulating film 3, facilitating the electrical connection between the pole column 21 and the outside of the battery cell, and increasing the reliability of the current flow path of the battery cell.

[0047] In some embodiments of the present invention, as Figure 1 , Figure 2 and Figure 4 shown, a second through hole 312 is provided on the film body 31, and an explosion-proof valve 22 is provided on the top cover 2. The explosion-proof valve 22 is disposed opposite to the second through hole 312. When thermal runaway occurs in the battery cell, the hot gas and the like of the thermal runaway inside the battery cell can be blown outwards from the explosion-proof valve 22, and the second through hole 312 can avoid the hot gas and the like rushing outwards from the explosion-proof valve 22, increasing the thermal safety of the battery cell.

[0048] The battery cell according to an embodiment of the present invention includes the above-mentioned housing assembly 100 and the electrode group, and the housing assembly 100 defines an accommodation space 12, and the electrode group is disposed in the accommodation space 12.

[0049] The battery cell according to an embodiment of the present invention, by covering the top cover 2 at the open opening 11 at the upper end of the housing body 1, and in the direction from bottom to top, the outer peripheral wall of the housing body 1 is provided with a coating area 13 and a non-coating area 14. When the top cover 2 is welded to the housing body 1, the non-coating area 14 is close to the welding connection position between the top cover 2 and the housing body 1, which can avoid the paint generated during the spraying of the coating area 13 from affecting the connection between the top cover 2 and the housing body 1. The film body 31 of the insulating film 3 covers the upper surface of the top cover 2, and at least part of the first folding portion 32 and the second folding portion 33 of the insulating film 3 covers the non-coating area 14, which can make the connection positions between the insulating film 3 and the housing body 1 and the top cover 2 more, increasing the reliability of the position of the insulating film 3, and the first folding portion 32 and the second folding portion 33 can also bring a certain insulating effect to the non-coating area 14, increasing the insulating effect of the housing body 1.

[0050] The other constitutions and operations of the housing assembly 100 according to an embodiment of the present invention and the battery cell having the same are known to those of ordinary skill in the art and will not be described in detail here.

[0051] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc., mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0052] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A housing assembly, characterized in that, For a battery cell and comprising: A shell body, the top end of the shell body is provided with an open mouth, along the height direction of the shell body, the outer peripheral wall of the shell body is sequentially provided with a coating area and a non - coating area, and the non - coating area is arranged close to the open mouth; A top cover, the top cover is covered at the open mouth; An insulating film, the insulating film includes a film body, a first folding part extending along the length direction of the film body and a second folding part extending along the width direction of the film body, the film body covers the upper surface of the top cover, and at least part of the first folding part and the second folding part covers the non - coating area.

2. The housing assembly according to claim 1, wherein, Along the up - down direction, the size of the first folding part is L1 and satisfies: 2mm ≤ L1 ≤ 15mm.

3. The housing assembly according to claim 1, wherein, Along the up - down direction, the size of the second folding part is L2 and satisfies: 2mm ≤ L2 ≤ 15mm.

4. The housing assembly according to claim 1, characterized in that, A first crease is provided between the first folding part and the film body, and the first crease extends along the width direction of the top cover; And / or, a second crease is provided between the second folding part and the film body, and the second crease extends along the length direction of the top cover.

5. The housing assembly according to claim 1, characterized in that Along the circumferential direction of the housing assembly, the adjacent first folding part and the second folding part are spaced apart.

6. The housing assembly according to claim 1, wherein Along the height direction of the shell body, the size of the non - coating area is H and satisfies: 1mm ≤ H ≤ 10mm.

7. The housing assembly according to claim 1, characterized in that The first folding part and the second folding part cover at least part of the coating area.

8. The housing assembly according to claim 1, wherein A first through - hole is provided on the film body, a pole post is provided on the top cover, the pole post protrudes from the upper surface of the top cover, and the pole post passes through the first through - hole.

9. The housing assembly according to claim 1, wherein A second through - hole is provided on the film body, an explosion - proof valve is provided on the top cover, and the explosion - proof valve is arranged opposite to the second through - hole.

10. A battery cell, characterized in that, Comprising: The housing assembly according to any one of claims 1 - 9, the housing assembly defines an accommodation space; A pole group, the pole group is arranged in the accommodation space.

Images