Lower plastic part, top cover assembly and battery

Abstract

The utility model belongs to the technical field of battery structures, and discloses a lower plastic part, a top cover assembly and a battery. The lower plastic part is provided with a pore-forming part, a bending part and an edge part, the pore-forming part is provided with a pole through hole, the battery pole can penetrate into the pole through hole so as to enable the lower plastic part to abut against the battery top cover, and a height difference exists between the pore-forming part and the edge part in the axis direction of the pole through hole; and the bending part is connected between the edge part and the hole forming part in a bending manner. In the top cover assembly, the pore-forming part of the lower plastic part is farther from the battery top cover than the edge part, so that when the lower plastic part bears the pressure from the battery pole, the internal stress is formed through the bent part, the upwarp phenomenon can be resisted at the edge position of the lower plastic part, and the upwarp phenomenon of the edge part in the direction far away from the battery top cover is avoided; therefore, the lower plastic part can achieve a preset isolation protection function, the production quality and the yield of the top cover assembly and the battery are further guaranteed, and assembly process complexity is avoided.

Description

Technical Field

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

[0002] During the battery manufacturing process, especially in the riveting process of the lower plastic insulating part of the battery, the lower plastic insulating part will warp in the opposite direction of the riveting. That is, theoretically, the lower plastic insulating part should remain flat or in the expected shape under the action of the riveting force to ensure the structural integrity and performance stability of the battery. However, in practice, deformation occurs, specifically manifested as the edge of the lower plastic insulating part warping away from the battery top cover sheet. Since the lower plastic insulating part plays a key role in isolating and protecting in the battery, once its shape changes, it may damage the internal structure of the battery, resulting in a decline in battery performance or causing safety problems.

[0003] More seriously, when the height value of the warp exceeds the specified range, it means that the deformation degree of the lower plastic insulating part has exceeded the acceptable standard. This deformation beyond the standard undoubtedly exacerbates the poor quality of the battery finished product, making the battery unable to meet the expected use requirements and safety standards, thus leading to an increase in the defective rate of the finished product.

[0004] To solve this problem, the prior art has taken a series of measures, including adjusting the riveting die and using a shaping tooling, etc. However, although these measures have been improved to a certain extent, the effect is not ideal. It is still necessary to spend a lot of time and resources on additional adjustments and increased processes to try to further solve this warping problem. This undoubtedly increases the production cost and process complexity, and has a certain impact on the efficiency and economy of battery manufacturing.

[0005] Based on the above, there is an urgent need for a lower plastic part, a top cover assembly and a battery to solve the above technical problems. Summary of the Utility Model

[0006] An object of the utility model is to provide a lower plastic part, which can avoid the phenomenon of reverse warping, ensure the production yield rate of good products, and avoid the complication of the assembly process.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] A lower plastic part, the lower plastic part has a hole-forming part, a bending part and an edge part, a pole post through-hole is arranged in the hole-forming part, and a battery pole post can penetrate into the pole post through-hole along the axial direction of the pole post through-hole to abut the lower plastic part against the battery top cover.

[0009] The edge portion is located at the edge position of the lower plastic part. There is a height difference between the hole-forming portion and the edge portion along the axis direction of the pole passing hole, and the bending portion is connected between the edge portion and the hole-forming portion in a bent shape.

[0010] The beneficial effects of the lower plastic part provided by the present utility model: Since the hole-forming portion is farther from the battery top cover than the edge portion, when the lower plastic part bears the pressure from the battery pole, internal stress is formed through the bending portion, which can resist the warping phenomenon at the edge position of the lower plastic part, avoid the edge portion from warping in the direction away from the battery top cover, enable the lower plastic part to play a preset isolation and protection function, thereby further ensuring the production quality and yield rate of the top cover assembly and the battery, and avoiding the complication of the assembly process and ensuring the assembly efficiency.

[0011] Another object of the present utility model is to provide a top cover assembly and a battery, which can avoid the phenomenon of reverse warping of the lower plastic part and ensure the production yield rate.

[0012] To achieve this purpose, the present utility model adopts the following technical solutions:

[0013] A top cover assembly, including a battery top cover, a battery pole, and the above-mentioned lower plastic part, wherein:

[0014] The battery top cover has a pole mounting hole, the battery pole passes through the pole mounting hole and the pole passing hole of the lower plastic part to rivet and fix the battery top cover and the lower plastic part, and the lower plastic part is configured such that before the battery pole is riveted, the hole-forming portion of the lower plastic part is farther from the battery top cover than the edge portion of the lower plastic part.

[0015] Preferably, the lower plastic part further includes a reinforcing rib, and the reinforcing rib is at least provided on the bending portion of the lower plastic part to make the bending portion be in a bent shape.

[0016] Preferably, the reinforcing rib is provided on the side of the lower plastic part close to the battery top cover, and the reinforcing rib can abut against the battery top cover.

[0017] Preferably, after the battery pole is riveted and fixed, the surface of the reinforcing rib abutting against the battery top cover is a plane, and the thickness of the reinforcing rib gradually decreases along the direction from the pole passing hole to the edge portion.

[0018] Preferably, the lower plastic part includes a large lower plastic part and a small lower plastic part. The large lower plastic part has a stepped hole, and a stepped surface is formed in the stepped hole. The pole post is disposed in the small lower plastic part through a hole, and the battery pole post passes through the pole post through hole and the stepped hole to press the small lower plastic part against the stepped surface and press the large lower plastic part against the battery top cover. The bending part and the edge part are both disposed on the large lower plastic part.

[0019] Preferably, the large lower plastic part and the small lower plastic part are made of different materials.

[0020] Preferably, the average thickness d of the bending part 1 is 0.5 mm - 0.7 mm.

[0021] Preferably, the thickness d of the reinforcing rib 2 is 0.3 mm - 0.7 mm.

[0022] A battery includes the above-mentioned top cover assembly.

[0023] The beneficial effects of the top cover assembly and the battery provided by the present utility model: In this top cover assembly, since the hole-forming part of the lower plastic part is farther away from the battery top cover than the edge part, when the lower plastic part bears the pressure from the battery pole post, internal stress is formed through the bending part, which can counteract the warping phenomenon at the edge position of the lower plastic part, avoid the edge part from warping in the direction away from the battery top cover, enable the lower plastic part to play a preset isolation and protection function, thereby further ensuring the production quality and the yield rate of the top cover assembly and the battery, and avoiding the complication of the assembly process and ensuring the assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a perspective view of the first lower plastic part provided by the present utility model;

[0025] Figure 2 is a front view of the first lower plastic part provided by the present utility model;

[0026] Figure 3 is a schematic diagram of the second lower plastic part assembled to the top cover assembly provided by the present utility model;

[0027] Figure 4 is a top view of the large lower plastic part of the second lower plastic part provided by the present utility model;

[0028] Figure 5 is along Figure 4 the cross-sectional view in the direction of A - A in

[0029] Figure 6 is along Figure 4Cross-sectional view in the B-B direction.

[0030] In the figure:

[0031] 1. Lower plastic part; 11. Large lower plastic part; 111. Step surface; 12. Small lower plastic part; 101. Hole-forming part; 102. Bending part; 103. Edge part; 104. Reinforcing rib;

[0032] 2. Battery top cover;

[0033] 3. Battery terminal post. Detailed implementation mode

[0034] The following further describes the present utility model in detail 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 sake of convenience of description, only parts related to the present utility model rather than all structures are shown in the drawings.

[0035] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", 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.

[0036] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the 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 other features between them. Moreover, the first feature being "above", "above and to the right", and "above 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", "below and to the left", and "below and on the bottom" of 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.

[0037] In the description of this embodiment, the orientation or positional relationship such as "above", "below", "right", and "left" is based on the orientation or positional relationship shown in the drawings, and is 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 therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0038] The following is based on the attached Figure 1 To Attachment Figure 6 The utility model is introduced with respect to a lower plastic part 1, a top cover assembly and a battery.

[0039] like Figure 1 , Figure 2 As shown, in this embodiment, a lower plastic part 1 is provided. The lower plastic part 1 has a hole-forming portion 101, a bent portion 102 and an edge portion 103, wherein the hole-forming portion 101 has a pole through hole, and the battery pole 3 can penetrate into the pole through hole along the axial direction of the pole through hole, so that the lower plastic is abutted against the battery top cover 2 to achieve a fixed connection with the battery top cover 2. The edge portion 103 is located at the edge portion 103 of the lower plastic part 1, and has a certain height difference with the hole-forming portion 101 along the axial direction of the pole through hole. The bent portion 102 is connected between the edge portion 103 and the hole-forming portion 101, and due to the existence of the height difference, the bent portion 102 can be connected between the edge portion 103 and the hole-forming portion 101 in a curved shape.

[0040] When using the lower plastic part 1, refer to Figure 3 As shown, the lower plastic part 1 and the battery top cover 2 are first abutted against each other, and the hole-forming portion 101 is further away from the battery top cover 2 than the edge portion 103. The battery top cover 2 has a pole mounting hole, and the pole through hole and the pole mounting hole are concentrically arranged. Then the battery pole 3 is inserted into the pole mounting hole and the pole through hole, and the lower plastic part 1, the battery top cover 2 and the battery pole 3 are fixedly connected by riveting. In the prior art, since the battery pole 3 applies pressure to the lower plastic part 1, the edge portion 103 will be lifted in a direction away from the battery top cover 2, affecting the normal isolation and protection function of the lower plastic part 1. In the present embodiment, since the hole-forming portion 101 is farther from the battery top cover 2 than the edge portion 103, when the lower plastic part 1 is subjected to the pressure from the battery pole 3, internal stress is formed through the bending portion 102, which can resist the warping phenomenon at the edge position of the lower plastic part 1, and prevent the edge portion 103 from warping in a direction away from the battery top cover 2, so that the lower plastic part 1 can play a preset isolation and protection function, thereby further ensuring the production quality and yield rate of the top cover assembly and the battery, avoiding the complication of the assembly process, and ensuring the assembly efficiency.

[0041] like Figure 3As shown, in this embodiment, a top cover assembly is further provided. The top cover assembly includes a battery top cover 2, battery terminal posts 3, a sealing ring, an upper plastic part, and the aforementioned lower plastic part 1. The battery top cover 2 is an important part of battery encapsulation. Its main function is to protect the battery core, prevent the leakage of chemical substances inside the battery, and at the same time avoid the influence of the external environment on the inside of the battery. The battery terminal posts 3 include a positive terminal post and a negative terminal post, which are generally columnar parts and are mainly used to connect the positive and negative electrodes of the battery core to the external circuit to ensure the normal charging and discharging of the battery. And, in this embodiment, the battery terminal posts 3 pass through the terminal post mounting holes and terminal post through holes and can rivet and fix the battery top cover 2 and the lower plastic part 1.

[0042] The sealing ring mainly plays a role of isolation and sealing, ensuring that the liquid or gas inside the battery will not leak out, and at the same time preventing external gases, dust and other impurities from entering the inside of the battery, thereby improving the service life and stability of the battery core. The upper plastic part and the lower plastic part 1 are arranged between the battery terminal posts 3 and the battery top cover 2 to insulate and isolate them from each other to avoid short - circuit between the positive terminal post and the negative terminal post directly through the battery top cover 2, playing a protective effect.

[0043] In this top cover assembly, since the hole - forming part 101 of the lower plastic part 1 is farther from the battery top cover 2 than the edge part 103, when the lower plastic part 1 bears the pressure from the battery terminal posts 3, internal stress is formed through the bending part 102, which can resist the warping phenomenon at the edge position of the lower plastic part 1, avoiding the edge part 103 from warping in the direction away from the battery top cover 2, enabling the lower plastic part 1 to play a preset isolation and protection function, thereby further ensuring the production quality and yield of the top cover assembly and the battery, and avoiding the complication of the assembly process and ensuring the assembly efficiency.

[0044] Reference Figure 3 、 Figure 4 As shown, the lower plastic part 1 includes a large lower plastic part 11 and a small lower plastic part 12. The large lower plastic part 11 has a stepped hole, and a stepped surface 111 is formed inside the stepped hole. The terminal post through hole is arranged on the small lower plastic part 12. When installing the battery terminal posts 3 and riveting and fixing them, the battery terminal posts 3 directly press the small lower plastic part 12 against the battery top cover 2 and abut against the stepped surface 111 through the small lower plastic part 12, thereby also pressing and fixing the large lower plastic part 11 against the battery top cover 2.

[0045] It can be understood that since the pressure mainly transmitted between the large lower plastic part 11 and the small lower plastic part 12 is along the axis direction of the hole passing through the pole post, the split structure is more difficult to cause the phenomenon of the edge part 103 warping compared to the integral lower plastic part 1, and it can enable the lower plastic part 1 to play a normal isolation and protection effect. Moreover, due to the different stress states of the large lower plastic part 11 and the small lower plastic part 12, it is preferably to make the large lower plastic part 11 and the small lower plastic part 12 of different materials to achieve a better balance between the structural strength and the overall weight. Of course, in some other embodiments, the lower plastic part 1 of an integral structure can also be used, or the large lower plastic part 11 and the small lower plastic part 12 can be made of the same material, and the present utility model does not make specific limitations thereon.

[0046] Optionally, in this embodiment, as Figure 4 shown, the lower plastic part 1 further includes a reinforcing rib 104. The reinforcing rib 104 is arranged on the bending part 102 and is located between the hole-forming part 101 and the edge part 103, so that the bending part 102 is arranged in a bent shape, and when bearing the pressure from the battery pole post 3, it can cooperate with the bending part 102 to form an appropriate internal stress, thereby better avoiding the phenomenon that the edge part 103 warps in the direction away from the battery top cover 2.

[0047] More specifically, in this embodiment, the reinforcing rib 104 is arranged on the large lower plastic part 11 and is evenly spaced around the stepped hole. The edge part 103 is located on the large lower plastic part 11, and the reinforcing rib 104 is connected between the stepped hole and the edge part 103, so as to counteract the pressure exerted by the small lower plastic part 12 on the large lower plastic part 11 with uniform stress and avoid the phenomenon of local warping. Exemplarily, in this embodiment, as Figure 4 shown, four reinforcing ribs 104 are arranged around the stepped hole in a cross shape, and the adjacent two reinforcing ribs 104 are spaced 90° apart, so as to generate uniform internal stress to counteract the pressure from the small lower plastic part 12.

[0048] In this embodiment, as Figure 5 、 Figure 6 shown, the reinforcing rib 104 is arranged on the side of the lower plastic part 1 close to the battery top cover 2, and when the battery pole post 3 rivets and fixes the lower plastic part 1 and the battery top cover 2, the reinforcing rib 104 can abut against the battery top cover 2. When the reinforcing rib 104 abuts against the battery top cover 2, it can share the stress of the bending part 102, thereby avoiding the phenomenon that the bending part 102 is excessively bent and breaks.

[0049] Exemplarily, in this embodiment, the average thickness d 1 of the bending part 102 is 0.5 mm - 0.7 mm, so that the large lower plastic part 11 can be formed with a lighter weight. The thickness d 2is 0.3 mm - 0.7 mm, so as to better ensure the structural strength of the large lower plastic part 11, and when bearing the pressure from the small lower plastic part 12, enable the reinforcing rib 104 and the bending part 102 to cooperate to generate sufficient stress and avoid warping.

[0050] Preferably, in this embodiment, the thickness of the reinforcing rib 104 gradually decreases along the direction from the pole post through hole to the edge part 103. When the small lower plastic part 12 abuts against the stepped surface 111, along the radial direction of the stepped hole, as it is farther away from the small lower plastic part 12, the thickness d of the reinforcing rib 104 2 gradually decreases from the maximum thickness d 2max 0.7 mm to the minimum thickness d 2min 0.3 mm, so as to further cooperate with the bending shape of the bending part 102 of the large lower plastic part 11 and further avoid the warping phenomenon of the edge part 103. Preferably, as Figure 6 shown, the reinforcing rib 104 and the bending part 102 are integrally formed, so as to better jointly form stress between the two to avoid the warping phenomenon of the edge part 103.

[0051] The present utility model also provides a battery, and this battery includes the above-mentioned top cover assembly. In this battery, since the hole-forming part 101 of the lower plastic part 1 is farther away from the battery top cover 2 than the edge part 103, when the lower plastic part 1 bears the pressure from the battery pole post 3, internal stress is formed through the bending part 102, which can resist the warping phenomenon at the edge position of the lower plastic part 1 and avoid the edge part 103 from warping in the direction away from the battery top cover 2, enabling the lower plastic part 1 to play a preset isolation and protection function, thereby further ensuring the production quality and yield rate of the top cover assembly and the battery, and avoiding the complication of the assembly process and ensuring the assembly efficiency.

[0052] Obviously, the above-mentioned embodiments of the present utility model are only examples for clearly explaining the present utility model, rather than limiting 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. The lower plastic part is characterized by: The lower plastic part (1) comprises a hole-forming portion (101), a bent portion (102) and an edge portion (103); the hole-forming portion (101) is provided with a pole through hole; a battery pole (3) can be inserted into the pole through hole along the axis direction of the pole through hole, so that the lower plastic part (1) is in contact with the battery top cover (2); The edge portion (103) is located at the edge of the lower plastic part (1), there is a height difference between the hole-forming portion (101) and the edge portion (103) along the axial direction of the pole through-hole, and the bent portion (102) is connected between the edge portion (103) and the hole-forming portion (101) in a bent shape.

2. A top cover assembly, characterized in that: It comprises a battery top cover (2), a battery pole (3) and a lower plastic part (1) as claimed in claim 1, wherein: The battery top cover (2) has a pole mounting hole, the battery pole (3) is inserted through the pole mounting hole and the pole through hole of the lower plastic part (1) to fix the battery top cover (2) and the lower plastic part (1) by riveting, and the lower plastic part (1) is configured such that, before the battery pole (3) is riveted, the hole forming portion (101) of the lower plastic part (1) is arranged farther from the battery top cover (2) than the edge portion (103) of the lower plastic part (1).

3. The top cover assembly according to claim 2, characterized in that: The lower plastic part (1) further comprises a reinforcing rib (104), wherein the reinforcing rib (104) is at least arranged on the curved portion (102) of the lower plastic part (1), so that the curved portion (102) is arranged in a curved shape.

4. The top cover assembly according to claim 3, characterized in that: The reinforcing rib (104) is arranged on a side of the lower plastic part (1) close to the battery top cover (2), and the reinforcing rib (104) is capable of abutting against the battery top cover (2).

5. The top cover assembly according to claim 4, characterized in that: After the battery pole (3) is riveted and fixed, the side of the reinforcing rib (104) abutting against the battery top cover (2) is a plane, and the thickness of the reinforcing rib (104) gradually decreases in the direction from the pole through hole toward the edge portion (103).

6. The top cover assembly according to claim 4, characterized in that: The lower plastic part (1) comprises a large lower plastic part (11) and a small lower plastic part (12); the large lower plastic part (11) has a stepped hole, a stepped surface (111) is formed in the stepped hole, the pole through hole is arranged in the small lower plastic part (12), the battery pole (3) is passed through the pole through hole and the stepped hole, so that the small lower plastic part (12) is pressed against the stepped surface (111), and the large lower plastic part (11) is pressed against the battery top cover (2); the bent portion (102) and the edge portion (103) are both arranged in the large lower plastic part (11).

7. The top cover assembly according to claim 6, characterized in that: The large lower plastic part (11) and the small lower plastic part (12) are made of different materials.

8. The top cover assembly according to claim 5, characterized in that: The average thickness d1 of the bent portion (102) is 0.5 mm to 0.7 mm.

9. The top cover assembly according to claim 8, characterized in that: The thickness d2 of the reinforcing rib (104) is 0.3 mm-0.7 mm.

10. A battery, characterized in that Comprising a top cover assembly as described in any one of claims 2-9.

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