Top cover assembly and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a top cover assembly and a battery. The top cover assembly comprises a top cover piece, a post terminal and an upper plastic part, a first assembly hole is formed in the top cover piece in a penetrating manner, the upper plastic part is arranged on the upper surface of the top cover piece and is provided with a second assembly hole in a penetrating manner, and the post terminal is of an I-shaped structure and comprises a base part, a post body part and a pressing rivet folding part; the two ends of the column body part are provided with a base part and a pressing rivet folding part respectively, a first step face between the base part and the column body part is insulated and connected to the lower portion of the top cover piece in a pressing mode, the column body part penetrates through the first assembling hole and the second assembling hole at the same time, and a second step face between the pressing rivet folding part and the column body part is connected to the upper plastic part in a pressing mode. And a first chamfer is arranged at one end, close to the second step surface, of the second assembly hole. Through the arrangement of the first chamfer, an avoiding space can be reserved between the upper plastic part and the pole, so that the plastic part on the pole can be prevented from being extruded to be deformed and even torn, and the use safety of the top cover assembly is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a top cover assembly and a battery. Background Art

[0002] For power lithium batteries, in addition to pipe components such as battery cells and BMS, the battery housing structure is also an important factor in its safety.

[0003] In the battery housing structure, the pole column and the upper plastic part are important components of the top cover assembly. The traditional assembly method is to first place the upper plastic part on the top cover sheet, then pass the pole column through the assembly combination hole, and then rivet the pole column to turn the edge so that the pole column can be assembled and fixed with the upper plastic part and the top cover sheet. However, when the pole column is riveted and turned over, the upper plastic part is easily squeezed by force, resulting in cracking, which seriously affects the sealing performance, insulation performance and use safety of the top cover assembly, thus affecting the performance and service life of the battery.

[0004] Based on the above, there is an urgent need for a top cover assembly and a battery to solve the problems existing in the prior art. Summary of the Utility Model

[0005] The first object of the utility model is to provide a top cover assembly which can ensure the sealing performance, insulation performance and use safety during the production and manufacturing process.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The top cover assembly includes a top cover sheet, a pole column terminal and an upper plastic part. A first assembly hole is penetrated and opened on the top cover sheet. The upper plastic part is arranged on the upper surface of the top cover sheet and is penetrated and opened with a second assembly hole. The pole column terminal has an "I" - shaped structure and includes a base part, a column body part and a riveting and folding part. The base part and the riveting and folding part are respectively arranged at both ends of the column body part. The first step surface between the base part and the column body part is insulated and pressed below the top cover sheet. The column body part simultaneously penetrates through the first assembly hole and the second assembly hole. The second step surface between the riveting and folding part and the column body part is pressed against the upper plastic part, and a first chamfer is arranged at one end of the second assembly hole close to the second step surface.

[0008] Preferably, the first chamfer is a round chamfer; or, the first chamfer is an inclined chamfer.

[0009] Preferably, the first chamfer is a round chamfer, and the radius range of the first chamfer is that a is greater than or equal to 0.5° and less than or equal to 1°; or, the first chamfer is an inclined chamfer, and the value range of the inclined surface length a of the first chamfer is that a is greater than or equal to 0.5 mm and less than or equal to 1 mm.

[0010] Preferably, a second chamfer is provided at the opening of the first assembly hole.

[0011] Preferably, the minimum distance L between the center of the surface of the second chamfer and the pole column ranges from L > 0.8 mm and L ≤ 1 mm.

[0012] Preferably, the second chamfer is a circular chamfer; alternatively, the second chamfer is an inclined chamfer.

[0013] Preferably, one end of the column body away from the base portion has a deformed surface, and the deformed surface is provided with an inclined angle. Along the direction from the center of the column body to the outer edge, the thickness of the column body gradually increases.

[0014] Preferably, the inclined angle β of the deformed surface ranges from β ≥ 176° and β ≤ 179°.

[0015] Preferably, the deformed surface includes a first annular joint surface and a second annular joint surface, and the first annular joint surface is arranged closer to the center of the column body than the second annular joint surface.

[0016] The beneficial effects of the top cover assembly provided by the present utility model: In the upper plastic part of the top cover assembly, by providing a first chamfer at one end of the second assembly hole close to the second step surface, the first chamfer can reserve sufficient avoidance space between the upper plastic part and the pole column, thereby avoiding the problem that the upper plastic part is squeezed and deformed or even torn when the press riveting and folding part of the pole column is formed, and further ensuring the sealing performance, insulation performance and use safety of the top cover assembly.

[0017] The second object of the present utility model is to provide a battery, which can effectively improve the use performance and service life by using the above-mentioned top cover assembly.

[0018] To achieve this purpose, the present utility model adopts the following technical solutions:

[0019] A battery, comprising a battery housing, an electric core and the above-mentioned top cover assembly, wherein the top cover assembly is hermetically and fixedly connected to the battery housing, and the electric core is located inside the battery housing and can be electrically connected to the top cover assembly.

[0020] The beneficial effects of the battery provided by the present utility model: The battery includes the above-mentioned top cover assembly. By adopting the above-mentioned top cover assembly, the battery has higher sealing performance, insulation performance and use safety, and effectively improves the use performance and service life. Description of the Drawings

[0021] Figure 1It is a schematic structural diagram of the top cover assembly provided by the embodiment of the present utility model;

[0022] Figure 2 It is an exploded view of the top cover assembly provided by the embodiment of the present utility model;

[0023] Figure 3 It is a cross-sectional view of the top cover assembly provided by the embodiment of the present utility model;

[0024] Figure 4 It is Figure 3 a partial enlarged view of position A in

[0025] Figure 5 It is a schematic structural diagram of the pole terminal when not press-riveted provided by the embodiment of the present utility model.

[0026] In the figure:

[0027] 1. Top cover sheet; 11. First assembly hole; 111. Second chamfer;

[0028] 2. Pole terminal; 21. Base part; 22. Column body part; 221. Deformation surface; 2211. First circumferential joint surface; 2212. Second circumferential joint surface; 23. Press-riveting and folding part;

[0029] 3. Upper plastic part; 31. Second assembly hole; 32. First chamfer;

[0030] 4. Explosion-proof valve assembly;

[0031] 5. Lower plastic part;

[0032] 6. Sealing ring. Detailed implementation manners

[0033] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only some parts related to the present utility model are shown in the drawings instead of all the structures.

[0034] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; 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 internal communication of two components or the interaction relationship between two components. 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.

[0035] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on the top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0036] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, 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, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0037] As Figures 1 to 5 shown, this embodiment provides a top cover assembly, which includes a top cover sheet 1, a pole terminal 2, an upper plastic part 3, an explosion-proof valve assembly 4, a lower plastic part 5 and a sealing ring 6. The pole terminal 2 can be a positive pole terminal or a negative pole terminal, and this embodiment does not limit this, and the pole terminal 2 will be described as a positive pole terminal hereinafter. Of course, when the pole terminal 2 is a negative pole terminal, other structures are the same as those when the pole terminal 2 is a positive pole terminal, and thus will not be elaborated here. In addition, the explosion-proof valve assembly 4 is installed at the middle position of the top cover sheet 1, the lower plastic part 5 is assembled on the lower surface of the top cover sheet 1, and the sealing ring 6 is installed between the lower plastic part 5 and the top cover sheet 1. Since the lower plastic part 5, the explosion-proof valve assembly 4 and the sealing ring 6 are all conventional structures, they will not be elaborated here.

[0038] Specifically, in combination with Figures 2 to 4As shown, a first assembly hole 11 is formed through the top cover sheet 1, a second assembly hole 31 is formed through the upper plastic part 3, and the pole terminal 2 has a "worker" - shaped structure, which includes a base part 21, a column body part 22, and a riveting and folding part 23. Among them, the base part 21 and the riveting and folding part 23 are respectively arranged at both ends of the column body part 22. The first step surface between the base part 21 and the column body part 22 is insulated and pressed under the top cover sheet 1. The column body part 22 is simultaneously inserted through the first assembly hole 11 and the second assembly hole 31. The second step surface between the riveting and folding part 23 and the column body part 22 is pressed on the upper surface of the upper plastic part 3. Through the above - mentioned arrangement, the fixed connection between the top cover sheet 1, the upper plastic part 3, and the pole terminal 2 can be realized. In addition, in the upper plastic part 3, a first chamfer 32 is arranged at one end of the second assembly hole 31 close to the second step surface. The setting of the first chamfer 32 can reserve enough avoidance space between the upper plastic part 3 and the pole, so as to avoid the problem that the upper plastic part 3 is extruded and deformed or even torn when the riveting and folding part 23 of the pole is formed, and further ensure the sealing performance, insulation performance, and use safety of the top cover assembly.

[0039] Optionally, the first chamfer 32 is an inclined chamfer or a round chamfer. The present utility model does not limit this. Both the inclined chamfer and the round chamfer can play a role in avoiding position during the forming process of the riveting and folding part 23, so as to meet the purpose of preventing the upper plastic part 3 from being extruded and cracked.

[0040] Preferably, in this embodiment, the first chamfer 32 is an inclined chamfer. During the actual production and manufacturing process, the inclined chamfer reserves more space and has a larger gap, so as to further reduce the risk of the upper plastic part 3 being extruded and cracked. The value range of the inclined surface length a of the first chamfer 32 is that a is greater than or equal to 0.5 mm and less than or equal to 1 mm. For example, the inclined surface length a of the first chamfer 32 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1.0 mm. It should be noted that setting the inclined surface length a of the first chamfer 32 within this numerical range has the advantage that it can not only avoid the problem that the contact area between the upper plastic part 3 and the pole is reduced due to too large an inclined surface length, which affects the resistance, but also ensure that the first chamfer 32 can leave enough avoidance space for the upper plastic part 3, thus effectively ensuring the use safety and reliability of the entire cover assembly. Further preferably, in this embodiment, the inclined surface length a of the first chamfer 32 is 0.8 mm.

[0041] Of course, in other embodiments, the first chamfer 32 can also be set as a round chamfer. Compared with the bevel chamfer, the round chamfer is easier to process and form, has a higher aesthetic degree, and can also reduce the wear problem caused by sharp edges. When the first chamfer 32 is a round chamfer, the radius range a of the first chamfer 32 is such that a is greater than or equal to 0.5° and less than or equal to 1°. For example, the radius range of the first chamfer 32 includes but is not limited to 0.5°, 0.6°, 0.7°, 0.8°, 0.9°, 1.0°. The advantages of setting the radius of the first chamfer 32 to the above range values are the same as those when the first chamfer 32 is a bevel chamfer and the slope value range is 0.5 mm - 1.0 mm, which will not be elaborated in this embodiment.

[0042] In this embodiment, both the top cover sheet 1 and the pole terminal 2 are made of aluminum profiles, so sufficient distance needs to be ensured between the two to ensure electrical insulation. To achieve the above purpose, a second chamfer 111 is provided at the opening of the first assembly hole 11, so that the minimum distance L between the top cover sheet 1 and the pole terminal 2 can be increased to a safe range, thereby effectively ensuring the insulation effectiveness between the pole terminal 2 and the top cover sheet 1, and further reducing the scrap rate of the top cover assembly and the production cost. It can be understood that the minimum distance L between the top cover sheet 1 and the pole terminal 2 is the minimum distance between the center of the surface of the second chamfer 111 and the pole. The value range of this minimum distance L is such that L is greater than 0.8 mm and less than or equal to 1 mm. For example, the values of this minimum distance L include but are not limited to 0.92 mm, 0.94 mm, 0.96 mm, 0.98 mm, or 1.00 mm.

[0043] Optionally, in this embodiment, the second chamfer 111 also selects a bevel chamfer to effectively ensure that the top cover sheet 1 and the pole are within a safe distance range and meet the requirements under actual working conditions. Of course, in other embodiments, the second chamfer 111 can also be set as a round chamfer to further reduce the processing pressure. Therefore, as long as the electrical insulation between the top cover sheet 1 and the pole terminal 2 can meet the working condition requirements, whether the second chamfer 111 is a round chamfer or a bevel chamfer is within the scope protected by the present utility model.

[0044] Optionally, refer to Figure 5As shown in the figure, in the pole terminal 2 provided in this embodiment, one end of the column body 22 away from the base portion 21 has a deformed surface 221. The deformed surface 221 is set to have an inclination angle, pointing from the center of the column body 22 to the outer edge direction of the column body 22, and the thickness of the column body 22 gradually increases. If the deformed surface 221 is not provided on the column body 22 but is set to a flat surface, after the pole is subjected to the turning and riveting process, the flat surface of the pole terminal 2 will be uneven, and there will be steps or marks formed by riveting on the end surface of the column body 22, which seriously affects the appearance quality. By providing the above-mentioned deformed surface 221 on the column body 22, the inclined part on the column body 22 will be riveted and deformed simultaneously with the press-riveting folding part 23, which helps to improve the defects existing in the prior art, reduces the situation that steps or marks are formed on the flat surface of the column body 22 due to the riveting of the pole terminal 2, makes the surface of the pole terminal 2 smoother and the flatness higher, meeting the requirements of production and use.

[0045] Furthermore, in this embodiment, the value range of the inclination angle β of the deformed surface 221 is that β is greater than or equal to 176° and less than or equal to 179°. For example, the value of the inclination angle β of the deformed surface 221 can be 176°, 177°, 178° or 179°. It should be noted that if the value of the inclination angle β of the deformed surface 221 is less than 176°, the angle between the deformed surface 221 and the horizontal plane will be relatively large, which is likely to cause material accumulation and is not conducive to forming a flat surface on the pole terminal 2. The inclination angle β of the deformed surface 221 cannot exceed 179° either, otherwise the part of the material that can generate deformation will be less, and the possibility of forming steps or marks cannot be reduced.

[0046] Specifically, in this embodiment, the deformed surface 221 includes a first circumferential joint surface 2211 and a second circumferential joint surface 2212. The first circumferential joint surface 2211 is arranged closer to the center of the column body 22 than the second circumferential joint surface 2212. Among them, the first circumferential joint surface 2211 is a horizontal plane, and the second circumferential joint surface 2212 is the above-mentioned deformed surface 221. The setting of the first circumferential joint surface 2211 makes the flatness of the pole terminal 2 better after press-riveting and folding.

[0047] This embodiment also provides a battery, which includes a battery case, an electric core, and the above-mentioned top cover assembly. By adopting the above-mentioned top cover assembly, the battery has higher sealing performance, insulation performance and use safety, thus effectively improving the use performance and service life.

[0048] In the description of this specification, the descriptions referring to terms such as "some embodiments", "other embodiments", 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 representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0049] Obviously, the above embodiments of the present utility model are merely examples given for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included in the protection scope of the claims of the present utility model.

Claims

1. A top cover assembly, characterized in that: The invention comprises a top cover sheet (1), a pole terminal (2) and an upper plastic part (3), wherein the top cover sheet (1) is provided with a first assembly hole (11), the upper plastic part (3) is arranged on the upper surface of the top cover sheet (1) and is provided with a second assembly hole (31), the pole terminal (2) is in an "I"-shaped structure, and comprises a base portion (21), a column portion (22) and a riveted folding portion (23), and the base portion (21) and the riveted folding portion (23) are respectively provided at two ends of the column portion (22). The folded portion (23) is provided with a first step surface between the base portion (21) and the column portion (22) and is insulated and crimped to the bottom of the top cover sheet (1). The column portion (22) is simultaneously passed through the first assembly hole (11) and the second assembly hole (31). The second step surface between the riveted folded portion (23) and the column portion (22) is crimped to the upper plastic part (3), and a first chamfer (32) is provided at one end of the second assembly hole (31) close to the second step surface.

2. The top cover assembly according to claim 1, characterized in that: The first chamfer (32) is a round chamfer; or, the first chamfer (32) is an oblique chamfer.

3. The top cover assembly according to claim 2, characterized in that: The first chamfer (32) is a round chamfer, and the radius range of the first chamfer (32) is that a is greater than or equal to 0.5° and less than or equal to 1°; or, the first chamfer (32) is an oblique chamfer, and the value range of the inclined surface length a of the first chamfer (32) is that a is greater than or equal to 0.5 mm and less than or equal to 1 mm.

4. The top cover assembly according to any one of claims 1 to 3, characterized in that: A second chamfer (111) is provided at the opening of the first assembly hole (11).

5. The top cover assembly according to claim 4, characterized in that: The value range of the minimum distance L between the surface center of the second chamfer (111) and the pole is that L is greater than 0.8 mm and less than or equal to 1 mm.

6. The top cover assembly according to claim 4, characterized in that: The second chamfer (111) is a round chamfer; or, the second chamfer (111) is an oblique chamfer.

7. The top cover assembly according to any one of claims 1 to 3, characterized in that: The column shaft (22) has a deformation surface (221) at one end away from the base (21), and the deformation surface (221) is arranged to have an inclined angle, pointing from the center of the column shaft (22) to the direction of the outer edge, and the thickness of the column shaft (22) gradually increases.

8. The top cover assembly according to claim 7, characterized in that: The value range of the inclination angle β of the deformation surface (221) is that β is greater than or equal to 176° and less than or equal to 179°.

9. The top cover assembly according to claim 8, characterized in that: The deformable surface (221) comprises a first annular surface (2211) and a second annular surface (2212); the first annular surface (2211) is arranged closer to the center of the column shaft (22) than the second annular surface (2212).

10. A battery, characterized in that It comprises a battery casing, a battery cell and a top cover assembly according to any one of claims 1 to 9, wherein the top cover assembly is sealed and fixedly connected to the battery casing, and the battery cell is located in the battery casing and can be electrically connected to the top cover assembly.

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