Insulation structure, top cover assembly and battery cell

Abstract

The utility model relates to battery technical field provides an insulation structure, top cap subassembly and electric core. The insulation structure above -mentioned includes: a pair of first insulating piece and connecting piece, a pair of first insulating piece is connected through connecting piece, and connecting piece is used for adjusting the length after a pair of first insulating piece connects, to make the length between a pair of first insulating piece and the length of the top cap of electric core be adapted. The insulation structure above -mentioned, through setting a pair of first insulating piece and connecting piece, can make the length of insulation structure adjustable, still can make the length of insulation structure and the length of top cap be adapted after the contraction of first insulating piece, thereby makes the pole hole on the insulation structure and the pole hole on top cap alignment, guarantees the assembly accuracy of pole.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to an insulation structure, a top cover assembly, and a battery cell. Background Technology

[0002] In existing rectangular lithium-ion battery designs, a plastic insulator is typically placed below the top cover. This insulator, as a critical structural component, must cover the cell terminal mounting area and be compatible with the overall battery length. However, due to the relatively long axial dimension of rectangular batteries, the length of the matching plastic insulator is also relatively long.

[0003] Currently, these long-sized plastic insulating parts are mainly manufactured using injection molding. However, during actual production, the shrinkage characteristics of plastic materials during the cooling and curing stage lead to significant shrinkage and deformation in the finished plastic insulating parts. This not only reduces the dimensional accuracy of the plastic insulating parts but also causes misalignment between the pre-drilled terminal mounting holes on the plastic insulating parts and the terminal holes on the top cover. When the misalignment exceeds the assembly tolerance range, it will directly lead to the positioning failure of the terminal pressing process, thereby affecting the overall assembly accuracy and sealing reliability of the battery. In severe cases, it may even cause safety hazards such as poor terminal contact or electrolyte leakage. Utility Model Content

[0004] This invention provides an insulation structure, a top cover assembly, and a battery cell to solve the defect in the prior art where the positional deviation between the electrode holes on the plastic part and the electrode holes on the top cover is caused by shrinkage of the plastic insulation part.

[0005] This utility model provides an insulation structure, including: a pair of first insulating members; a connector, wherein the pair of first insulating members are connected by the connector, and the connector is used to adjust the length of the pair of first insulating members after connection so that the length between the pair of first insulating members is adapted to the length of the top cover of the battery cell.

[0006] According to the present invention, the connecting member is an elastic element in the insulation structure provided.

[0007] According to the present invention, one of the connector and the first insulating member has a protrusion, and the other has a slot. The width of the slot is greater than the width of the protrusion, so that the protrusion can move along the slot to adjust the length of the first insulating member after connection.

[0008] According to the present invention, an insulating structure is provided, wherein the protrusion includes: a first protrusion connected to the first insulating member or the connecting member; a second protrusion connected to the first protrusion, wherein the width of the second protrusion is greater than the width of the first protrusion, and the first protrusion passes through the slot and is movable along the slot.

[0009] According to the present invention, an insulating structure is provided, wherein the first insulating member includes a first body portion, the first body portion is a groove-shaped structure, one end of the groove-shaped structure is an open end, one end of the connector extends into the groove-shaped structure through the open end, and the bottom of the groove-shaped structure is provided with the protrusion or the slot.

[0010] According to the present invention, an insulating structure is provided in which the bottom of the groove-shaped structure and the connector are provided with a plurality of vent holes.

[0011] According to the present invention, the first insulating member further includes a second body portion, which is connected to the first body portion. The second body portion is provided with a first through hole for inserting an electrode post.

[0012] According to the insulating structure provided by this utility model, the first insulating member further includes a third body portion, which is connected to the second body portion.

[0013] This utility model also provides a top cover assembly, comprising: an insulating structure as described above; a top cover disposed on one side of the insulating structure; a pair of second insulating members, each of the second insulating members being stacked with the top cover; a pair of riveting blocks, each of the riveting blocks being stacked with one of the second insulating members; and a pair of poles disposed on the other side of the insulating structure, each of the poles passing through the insulating structure, the top cover, and the second insulating members and being riveted to the riveting blocks.

[0014] This utility model also provides a battery cell, comprising: a housing; and a top cover assembly as described above, wherein the top cover assembly is connected to the housing.

[0015] The insulation structure provided by this utility model, by setting a pair of first insulating parts and connecting parts, allows the length of the insulation structure to be adjustable. Even after the first insulating parts are contracted, the length of the insulation structure can still be matched with the length of the top cover, thereby aligning the pole hole on the insulation structure with the pole hole on the top cover and ensuring the assembly accuracy of the pole. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the insulation structure provided by this utility model.

[0018] Figure 2 yes Figure 1 The diagram shows the structure of the first insulating element.

[0019] Figure 3 yes Figure 1 The diagram shows the structure of the connector.

[0020] Figure 4 This is a structural schematic diagram of the top cover assembly provided by this utility model.

[0021] Figure label:

[0022] 1. First insulating component; 2. Connecting component; 3. Top cover; 4. Terminal post; 5. Sealing ring; 6. Second insulating component; 7. Riveting block; 8. Explosion-proof valve; 9. Patch;

[0023] 11. First body part; 12. Second body part; 13. Third body part; 14. Receiving groove; 21. Protrusion; 31. Second through hole; 32. First groove; 33. Through groove; 61. Third through hole; 62. Second groove; 71. Fourth through hole; 111. Slot; 112. Vent hole; 121. First through hole; 211. First protrusion; 212. Second protrusion; 213. Inclined surface. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] The following is combined with Figures 1-4 This invention describes the insulation structure, top cover assembly, and battery cell of the present invention.

[0026] like Figure 1 As shown in the embodiment of this utility model, the insulating structure includes: a pair of first insulating members 1 and a connecting member 2. The pair of first insulating members 1 are connected by the connecting member 2, which is used to adjust the length of the first insulating members 1 after connection so that the length between the pair of first insulating members 1 is adapted to the length of the top cover 3.

[0027] Specifically, in the prior art, the insulating plastic part is a single piece, while in this embodiment, the insulating plastic part is divided into two parts, namely a pair of first insulating parts 1. The two first insulating parts 1 are connected by a connector 2 to adjust the total length of the insulating structure so that it matches the length of the top cover 3. Optionally, the connector 2 can be an elastic element, with its two ends connected to the two first insulating parts 1 respectively. During assembly, the elastic deformation of the elastic element provides a certain adjustment margin after the pair of first insulating parts 1 are connected, thereby ensuring that the terminal holes on the first insulating parts 1 are aligned with the terminal holes on the top cover 3, thus ensuring assembly accuracy; alternatively, the first insulating parts 1 can also be snapped into the connector 2. In this embodiment, the width of the slot is greater than the width of the snap-fit ​​element so that the snap-fit ​​element can move within the slot, thereby providing a certain adjustment margin after the pair of first insulating parts 1 are connected, thus ensuring that the terminal holes on the first insulating parts 1 are aligned with the terminal holes on the top cover 3, thus ensuring assembly accuracy.

[0028] In this embodiment, the first insulating component 1 is a plastic insulating component.

[0029] The insulation structure provided in this embodiment of the utility model can make the length of the insulation structure adjustable by setting a pair of first insulating parts and connecting parts. Even after the first insulating parts are contracted, the length of the insulation structure can still be matched with the length of the top cover, so that the pole hole on the insulation structure is aligned with the pole hole on the top cover, thus ensuring the assembly accuracy of the pole.

[0030] Optionally, in one embodiment of this utility model, the connector 2 is an elastic element, which can be a spring; since the shrinkage of the plastic insulating element is small, the connector 2 can also be silicone.

[0031] Optionally, in another embodiment of the present invention, one of the connector 2 and the first insulating member 1 is provided with a protrusion 21, and the other is provided with a groove 111. The width of the groove 111 is greater than the width of the protrusion 21, so that the protrusion 21 can move along the groove 111 to adjust the length of the insulating structure.

[0032] Specifically, such as Figure 2 and Figure 3 As shown, the first insulating member 1 has a slot 111, and the two ends of the connector 2 are respectively provided with protrusions 21 for connecting with the two first insulating members 1. Since the width of the slot 111 is greater than the width of the protrusions 21, the protrusions 21 can move within the slot 111. When the protrusions 21 abut against the groove wall of the slot 111 near the end of the first insulating member 1, the length of the insulating structure is the longest; when the protrusions 21 abut against the groove wall of the slot 111 away from the end of the first insulating member 1, the length of the insulating structure is the shortest. In this embodiment, the position of the protrusions 21 within the slot 111 can be adjusted according to the position of the pole hole on the insulating structure and the position of the pole hole on the top cover 3.

[0033] Optionally, a protrusion 21 may be provided on the first insulating member 1, and a pair of slots 111 may be provided on the connector 2 to enable the connector 2 to connect with a pair of first insulating members 1.

[0034] It is understandable that the number of protrusions 21 or slots 111 on the first insulating member 1 can be one or more, and correspondingly, one end of the connector 2 is provided with a matching number of slots 111 or protrusions 21.

[0035] Optionally, in the embodiments described above, the protrusion 21 can be a bump, and the width of the slot 111 is greater than the width of the bump.

[0036] Alternatively, the structure of protrusion 21 can also be other. For example... Figure 3 As shown, the protrusion 21 includes a first protrusion 211 and a second protrusion 212. The first protrusion 211 is connected to the first insulating member 1 or the connector 2, and the second protrusion 212 is connected to the first protrusion 211. The width of the second protrusion 212 is greater than the width of the first protrusion 211. The first protrusion 211 passes through the slot 111 and can move along the slot 111.

[0037] Specifically, taking the protrusion 21 located on the connector 2 as an example, the first protrusion 211 and the second protrusion 212 are connected to form a hook structure, and the second protrusion 212 extends outward from the connector 2. The width of the slot 111 can be slightly larger than the width of the second protrusion 212 so that the second protrusion 212 can pass through the slot 111. At this time, since the width of the first protrusion 211 is smaller than the width of the slot 111, there is a certain adjustment margin between the first protrusion 211 and the slot 111.

[0038] Furthermore, the width of the slot 111 can also be adapted to the width of the second protrusion 212. In this embodiment, in order to facilitate the second protrusion 212 passing through the slot 111, a slope 213 can be provided between the surface of the second protrusion 212 away from the first protrusion 211 and the side surface of the second protrusion 212 to reduce the resistance during assembly.

[0039] like Figure 2 As shown, in an embodiment of this utility model, the first insulating member 1 includes a first body part 11, which is a groove-shaped structure. One end of the groove-shaped structure is open, and one end of the connector 2 extends into the groove-shaped structure through the open. The bottom of the groove-shaped structure is provided with a protrusion 21 or a slot 111.

[0040] Specifically, when the bottom of the groove structure is provided with a slot 111, the protrusion 21 on the connector 2 extends through the slot 111 to the bottom of the first body part 11; when the bottom of the groove structure is provided with a protrusion 21, the protrusion 21 is located inside the groove structure.

[0041] Furthermore, a pair of groove-shaped structures are connected by connector 2 to form a receiving groove 14, which is opposite to the explosion-proof valve 8 of the battery cell. Therefore, multiple vent holes 112 are provided at the bottom of each groove-shaped structure and at connector 2.

[0042] like Figure 2 As shown, the first insulating member 1 also includes a second body part 12, which is connected to the first body part 11. The second body part 12 is provided with a first through hole 121, which is used to pass through the pole post 4.

[0043] Furthermore, the first insulating member 1 also includes a third body portion 13, which is connected to the second body portion 12. The first body portion 11 and the third body portion 13 are used to contact the electrode group of the battery cell.

[0044] like Figure 4 As shown, this embodiment of the present invention also provides a top cover assembly, including: an insulating structure, a top cover 3, a pair of pole posts 4, a pair of second insulating elements 6, and a pair of riveting blocks 7. The top cover 3 is disposed on one side of the insulating structure, each second insulating element 6 is stacked with the top cover 3, each riveting block 7 is stacked with one second insulating element 6, and the pair of pole posts 4 are disposed on the other side of the insulating structure. Each pole post 4 passes through the insulating structure, the top cover 3, and the second insulating elements 6 and riveting blocks 7.

[0045] Specifically, the top cover 3 is provided with a pair of first grooves 32, and the bottom of each first groove 32 is provided with a second through hole 31. A second insulating member 6 is embedded in each first groove 32. The second insulating member 6 is provided with a second groove 62, and the bottom of the second groove 62 is provided with a third through hole 61. The riveting block 7 is embedded in the second groove 62. The riveting block 7 is provided with a fourth through hole 71. In this embodiment, the first through hole 121, the second through hole 31, the third through hole 61 and the fourth through hole 71 are aligned and have the same size. The pole post 4 passes through the first through hole 121, the second through hole 31 and the third through hole 61 in sequence, and is riveted to the fourth through hole 71.

[0046] Furthermore, the top cover assembly also includes a pair of sealing rings 5, with a portion of each sealing ring 5 fitted over the pole post 4 and the remaining portion embedded in the first through hole 121, so that the pole post 4 is sealed to the first insulating member 1.

[0047] Furthermore, the top cover assembly also includes an explosion-proof valve 8 and a patch 9. The top cover 3 has a through groove 33 in the middle, which is opposite to the receiving groove 14. The explosion-proof valve 8 is embedded in the through groove 33, and the patch 9 is placed on the through groove 33.

[0048] The top cover assembly provided in this embodiment of the utility model has an adjustable insulation structure. Even after the insulation structure shrinks, its length can still match the length of the top cover, thereby aligning the pole hole on the insulation structure with the pole hole on the top cover and ensuring the assembly accuracy of the pole.

[0049] This utility model embodiment also provides a battery cell, including: a housing and a top cover assembly, wherein the top cover assembly is connected to the housing.

[0050] Specifically, the housing is provided with an electrode assembly, the electrode assembly is connected to an electrode tab, the electrode tab is welded to the electrode post 4, and the electrode assembly abuts against the first body part 11 and the third body part 13 of the first insulating member 1.

[0051] The battery cell provided in this embodiment of the present invention ensures assembly accuracy by setting a top cover assembly.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An insulating structure, characterized in that, include: A pair of first insulating elements; A connector is provided, through which a pair of first insulating members are connected. The connector is used to adjust the length of the pair of first insulating members after they are connected, so that the length between the pair of first insulating members is adapted to the length of the top cover of the battery cell.

2. The insulation structure according to claim 1, characterized in that, The connecting element is an elastic element.

3. The insulation structure according to claim 1, characterized in that, One of the connector and the first insulating member has a protrusion, and the other has a slot. The width of the slot is greater than the width of the protrusion, so that the protrusion can move along the slot to adjust the length of the pair of first insulating members after connection.

4. The insulation structure according to claim 3, characterized in that, The protrusion includes: The first protrusion is connected to the first insulating member or the connecting member; The second protrusion is connected to the first protrusion. The width of the second protrusion is greater than the width of the first protrusion. The first protrusion passes through the slot and can move along the slot.

5. The insulation structure according to claim 3, characterized in that, The first insulating member includes a first body portion, which is a groove-shaped structure. One end of the groove-shaped structure is open, and one end of the connector extends into the groove-shaped structure through the open. The bottom of the groove-shaped structure is provided with the protrusion or the slot.

6. The insulation structure according to claim 5, characterized in that, The bottom of the groove-shaped structure and the connector are provided with multiple vent holes.

7. The insulation structure according to claim 5, characterized in that, The first insulating member further includes a second body portion, which is connected to the first body portion. The second body portion is provided with a first through hole for inserting an electrode post.

8. The insulation structure according to claim 7, characterized in that, The first insulating member further includes a third body portion, which is connected to the second body portion.

9. A top cover assembly, characterized in that, include: The insulating structure according to any one of claims 1-8; The top cover is located on one side of the insulating structure; A pair of second insulating elements, each of which is stacked with the top cover; A pair of rivet blocks, each of the rivet blocks being stacked with a second insulating element; A pair of poles are located on the other side of the insulating structure, and each pole passes through the insulating structure, the top cover, and the second insulating member and is riveted to the riveting block.

10. A battery cell, characterized in that, include: case; The top cover assembly of claim 9, wherein the top cover assembly is connected to the housing.

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