Insulating member and battery pack

Abstract

The utility model provides a kind of insulating part and battery pack.The insulating part includes at least one edge fold of insulating main body and, insulating main body has the first surface and the second surface opposite along the thickness direction of insulating main body;Edge fold is connected to be arranged in the edge of insulating main body, and edge fold extends in the direction away from the first surface.In the embodiment of the utility model, by setting at least one edge fold in the edge of insulating main body, edge fold extends in the direction away from the first surface, and edge fold can increase the creepage distance of battery cell and end plate, to improve the insufficient insulation withstand voltage capacity of insulating part, cannot satisfy the technical problem of the creepage distance requirement of battery cell and end plate.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to an insulating part and battery pack. BACKGROUND

[0002] In the related art, the battery pack includes a battery module, opposite ends of the battery module are provided with end plates, in order to ensure the insulation withstand voltage requirement between the battery module and the end plate, an insulating part is usually arranged between the battery module and the end plate. However, the insulation withstand voltage capacity of the insulating part is insufficient, and cannot meet the creepage distance requirement of the battery cell and the end plate.

[0003] Therefore, it is urgent to solve the above technical problems. SUMMARY

[0004] The embodiment of the utility model provides a kind of insulating part and battery pack, can improve the insufficient insulation withstand voltage capacity of insulating part, cannot meet the technical problem of the creepage distance requirement of the battery cell and the end plate.

[0005] In a first aspect, the embodiment of the utility model provides an insulating part, and the insulating part comprises:

[0006] An insulating body has a first surface and a second surface opposite along the thickness direction of the insulating body;

[0007] At least one flange is connected to the edge of the insulating body, and the flange extends away from the first surface.

[0008] In an embodiment, the flange includes a first flange arranged on opposite sides of the insulating body, and a plurality of protruding structures are arranged on the side surface of the two first flanges facing away from each other.

[0009] In an embodiment, a plurality of protruding structures are arranged along the length direction of the first flange, and the size of the protruding structure in the width direction of the first flange is the same as the width of the first flange.

[0010] In an embodiment, the first flange has a middle region and an edge region arranged along the length direction of the first flange, the edge region is located on both sides of the middle region, and a plurality of protruding structures are located in the middle region.

[0011] In an embodiment, the flange further includes a second flange connecting the two first flanges, and the average width of the second flange is less than or equal to the average width of the first flange.

[0012] In an embodiment, the width of the two ends of the second flange is greater than the width of the middle region of the second flange, and the width of the two ends of the second flange is equal to the width of the first flange.

[0013] In an embodiment, the second surface is a side surface of the insulating body facing away from the folded edge, and the second surface is provided with a plurality of positioning grooves, and a distance between the positioning grooves and a center of the insulating body is greater than a minimum distance between the positioning grooves and a side wall of the insulating body.

[0014] In an embodiment, the first surface is provided with a plurality of positioning protrusions, and the positioning protrusions are arranged in a position corresponding to the positioning grooves.

[0015] In an embodiment, a thickness of the insulating body is greater than a thickness of the folded edge.

[0016] In a second aspect, an embodiment of the utility model provides a battery pack, the battery pack includes a battery cell, an end plate and the above-mentioned insulating piece, the insulating piece is arranged between the battery cell and the end plate, and the folded edge is located on a side of the insulating body close to the battery cell.

[0017] The embodiment of the utility model has the advantages of:

[0018] In the embodiment of the utility model, at least one folded edge is arranged at the edge of the insulating body, the folded edge extends in a direction away from the first surface, the folded edge can increase the creepage distance of the battery cell and the end plate, thereby improving the insufficient insulation withstand voltage of the insulating piece and solving the technical problem that the creepage distance requirement of the battery cell and the end plate cannot be met. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the drawings needed in the embodiment description will be briefly introduced as follows, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.

[0020] Figure 1 is a perspective view of the insulating piece provided by the embodiment of the utility model;

[0021] Figure 2 is Figure 1 a front view of the insulating piece in figure 1;

[0022] Figure 3 is Figure 1 a rear view of the insulating piece in figure 1;

[0023] Figure 4 is Figure 1 a top view of the insulating piece in figure 1;

[0024] Figure 5 is a perspective view of the battery pack provided by the embodiment of the utility model.

[0025] Explanation of reference numerals in the attached figures:

[0026] Insulating component 1;

[0027] Insulating body 10, first surface 11, positioning boss 111, second surface 12, positioning groove 121;

[0028] Folded edge 20, first folded edge 21, raised structure 211, second folded edge 22;

[0029] The width w1 of the first fold 21, the width w2 of the middle area B1 of the second fold 22, and the width w3 of both ends of the second fold 22;

[0030] Middle region B1, edge region B2;

[0031] The length direction D1 and the width direction D2 of the first folded edge 21;

[0032] 2. Battery pack, 3. Battery cell, 31. Busbar, 4. End plate, 5. Steel strip. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0034] Firstly, such as Figures 1 to 4 As shown, an embodiment of the present invention provides an insulating member 1, which includes an insulating body 10 and at least one folded edge 20. The insulating body 10 has a first surface 11 and a second surface 12 opposite to each other along the thickness direction of the insulating body 10. The folded edge 20 is connected to the edge of the insulating body 10 and extends in a direction away from the first surface 11.

[0035] The insulating component 1 is made of an insulating material, such as polycarbonate (PC). The insulating component 1 can be formed by injection molding, but is not limited to this process.

[0036] like Figure 1As shown, the insulating body 10 is in a plate structure. The first surface 11 and the second surface 12 of the insulating body 10 are arranged along the thickness direction of the insulating body 10. The insulating body 10 has a plurality of side walls connecting the first surface 11 and the second surface 12. The area of the first surface 11 and the second surface 12 is greater than the area of any side wall of the insulating body 10. The thickness direction of the insulating body 10 refers to the direction perpendicular to the first surface 11, that is Figure 1 the D2 direction in FIG. 6.

[0037] As shown in FIG. 1, Figure 5 the insulating member 1 can be applied in the battery pack 2. The battery pack 2 includes a plurality of stacked battery cells 3. The battery cell 3 has a large end face and a small end face. Both the large end face and the small end face are side faces of the battery cell 3, and the area of the large end face is greater than the area of the small end face. End plates 4 corresponding to the large end faces of the battery cells 3 are arranged at both ends of the plurality of stacked battery cells 3. The insulating member 1 can be arranged between the battery cell 3 and the end plate 4, the first surface 11 can abut against the large end face of the battery cell 3, and the second surface 12 can abut against the end plate 4, thereby achieving insulation between the battery cell 3 and the end plate 4 and preventing electrical connection between the battery cell 3 and the end plate 4.

[0038] The shape of the first surface 11 of the insulating body 10 can be set as needed. The first surface 11 is arranged close to the battery cell 3, and the shape of the first surface 11 can be set according to the shape of the surface of the battery cell 3. When the battery cell 3 is a square battery cell 3, the shape of the first surface 11 can be rectangular. When the shape of the side surface of the battery cell 3 close to the first surface 11 is other shapes, the shape of the first surface 11 can be correspondingly set to match the shape of the surface of the battery cell 3. In the drawings of the present application, the shape of the first surface 11 is rectangular, which should not be understood as a limitation of the present application.

[0039] As shown in FIG. 2, Figure 1 the folded edge 20 is arranged at the edge of the insulating body 10, and the folded edge 20 is connected with the side wall of the insulating body 10 and extends in a direction away from the first surface 11. When the insulating member 1 can be applied in the battery pack 2, the folded edge 20 can abut against the small end face or the top face of the battery cell 3, for increasing the creepage distance between the battery cell 3 and the end plate 4, so as to meet the insulation withstand voltage requirement of the battery pack 2.

[0040] Optionally, the folded edge 20 can extend in a direction perpendicular to the first surface 11. For ease of description, the extending direction of the folded edge 20 away from the first surface 11 is referred to as the width direction of the folded edge 20, that is Figure 1 the D2 direction in FIG. 6. The direction perpendicular to the width direction of the folded edge 20 and perpendicular to the thickness direction of the folded edge 20 is referred to as the length direction of the folded edge 20, that is Figure 1 the D1 direction in FIG. 6. The length of the folded edge 20 is at least greater than the width of the folded edge 20.

[0041] In some embodiments, the length of the folded edge 20 can be equal to the length of the sidewall of the insulating body 10 adjacent to the folded edge 20, thereby increasing the length of the folded edge 20, improving the insulation withstand voltage capability of the insulating member 1, and increasing the creepage distance between the battery cell 3 and the end plate 4. Here, the length of the folded edge 20 refers to its dimension in the D1 direction, and the length of the sidewall of the insulating body 10 refers to its dimension in the D1 direction. "Folded edge 20 adjacent to the sidewall of the insulating body 10" means that the folded edge 20 and the sidewall of the insulating body 10 are connected and arranged together.

[0042] In other embodiments, the length of the folded edge 20 may also be less than the length of the sidewall of the insulating body 10 adjacent to the folded edge 20.

[0043] The insulating component 1 can be integrally formed, and the material of the insulating body 10 can be the same as the material of the folded edge 20.

[0044] like Figures 1 to 4 As shown, in one embodiment, the folded edge 20 includes first folded edges 21 disposed on opposite sides of the insulating body 10. A plurality of protrusions 211 are provided on the surface of the two first folded edges 21 facing away from each other. The surface of the protrusions 211 protrudes relative to the surface of the first folded edges 21, and the direction of protrusion is away from the geometric center of the insulating body 10.

[0045] Please see Figure 5 When the insulating component 1 is applied to the battery pack 2, the battery cell 3 is disposed between the two first folded edges 21, that is, the first folded edges 21 cover the small end face of the battery cell 3. By disposing the protruding structure 211 on the surfaces of the two folded edges 20 that are opposite to each other, the protruding structure 211 can be prevented from affecting the assembly of the insulating component 1 and the battery cell 3.

[0046] The surfaces of the two first folded edges 21 that are close to each other are flat, and the surfaces of the two first folded edges 21 that are close to each other abut against the small end face of the battery cell 3, thereby making the structure of the battery pack 2 more compact. The surfaces of the two first folded edges 21 that are opposite to each other are provided with protruding structures 211, which can increase the thickness of the first folded edges 21 and improve the mechanical strength of the first folded edges 21.

[0047] The shape of the protrusion structure 211 can be set as needed. For example, the cross-sectional shape of the protrusion structure 211 can be triangular, trapezoidal, arc-shaped, etc., but is not limited to these.

[0048] In one embodiment, such as Figures 1 to 3As shown, the plurality of protruding structures 211 are arranged along the length direction D1 of the first fold edge 21, and the size of the protruding structures 211 in the width direction D2 of the first fold edge 21 is the same as the width w1 of the first fold edge 21. By making the size of the protruding structures 211 in the width direction D2 of the first fold edge 21 the same as the width w1 of the first fold edge 21, the length of the protruding structures 211 along the width direction D2 of the first fold edge 21 can be maximized, further improving the mechanical strength of the first fold edge 21.

[0049] In other embodiments, the plurality of protruding structures 211 can be arranged along the width direction D2 of the first fold edge 21, and the size of the protruding structures 211 in the length direction D1 of the first fold edge 21 can be less than or equal to the length of the first fold edge 21.

[0050] In an embodiment, as shown in Figure 1 , the first fold edge 21 has a middle region B1 and an edge region B2 arranged along the length direction D1 of the first fold edge 21, the edge region B2 is located on both sides of the middle region B1, and the plurality of protruding structures 211 are located in the middle region B1.

[0051] The length of the middle region B1 and the length of the edge region B2 can be set as needed. The length of the middle region B1 refers to the size of the middle region B1 in the length direction D1 of the first fold edge 21, and the length of the edge region B2 refers to the size of the edge region B2 in the length direction D1 of the first fold edge 21.

[0052] Optionally, the plurality of protruding structures 211 are arranged in the middle region B1, and adjacent two protruding structures 211 are arranged at intervals. The interval between the adjacent two protruding structures 211 can be set as needed. For example, the interval between the adjacent two protruding structures 211 is less than the length of the edge region B2, so that the interval between the protruding structures 211 is small, further improving the mechanical strength of the first fold edge 21.

[0053] As shown in Figure 5 , by arranging the protruding structures 211 only in the middle region B1 and not in the edge region B2, space can be reserved for subsequent assembly of the steel belt 5, avoiding interference between the protruding structures 211 of the edge region B2 and the steel belt 5. The steel belt 5 surrounds the battery cell 3 and the end plate 4, and is used to fix the battery cell 3 and the end plate 4.

[0054] In an embodiment, as shown in Figure 1 and Figure 4 , the fold edge 20 further comprises a second fold edge 22 connecting the two first fold edges 21, and the average width of the second fold edge 22 is less than or equal to the average width of the first fold edge 21.

[0055] The second folded edge 22 is arranged on one side wall of the insulating body 10, and two ends of the second folded edge 22 are connected to one first folded edge 21 respectively. Through the above arrangement, the insulating body 10, the first folded edge 21 and the second folded edge 22 are all connected and arranged, the surface area of the insulating piece 1 is increased, the insulating piece 1 can cover more surfaces of the battery cell 3, the creepage distance between the battery cell 3 and the end plate 4 is increased, and the requirements of the insulation withstand voltage of the battery pack 2 are met.

[0056] In some embodiments, the average width of the second folded edge 22 is equal to the average width of the first folded edge 21, so as to increase the surface area of the battery cell 3 covered by the second folded edge 22 and increase the creepage distance between the battery cell 3 and the end plate 4, so as to meet the requirements of the insulation withstand voltage of the battery pack 2.

[0057] In some embodiments, as shown in Figure 1 and Figure 4 , the average width of the second folded edge 22 is less than the average width of the first folded edge 21. Thus, the second folded edge 22 can avoid the components on the battery cell 3 and avoid interference between the second folded edge 22 and the components on the battery cell 3.

[0058] Please refer to Figure 5 , the battery cell 3 includes a shell and a cover plate, and a bus bar 31 can be arranged on the cover plate, the bus bar 31 is used to realize series and parallel connection of multiple battery cells 3. The second folded edge 22 can be arranged corresponding to the cover plate, and by making the average width of the second folded edge 22 less than the average width of the first folded edge 21, the second folded edge 22 can avoid the bus bar 31 and avoid interference between the second folded edge 22 and the bus bar 31.

[0059] In an embodiment, as shown in Figure 1 and Figure 4 , the width w3 of the two ends of the second folded edge 22 is greater than the width w2 of the middle region B1 of the second folded edge 22, and the width w3 of the two ends of the second folded edge 22 is equal to the width w1 of the first folded edge 21. That is, the second folded edge 22 has a structure of narrow middle and wide ends. Since the bus bar 31 is arranged corresponding to the middle region B1 of the battery cell 3, the middle region B1 of the second folded edge 22 needs to avoid the bus bar 31, and the two ends of the second folded edge 22 do not need to avoid the bus bar 31. Therefore, the width w3 of the two ends of the second folded edge 22 can be made equal to the width w1 of the first folded edge 21, the width w3 of the two ends of the second folded edge 22 is increased as much as possible, and the coverage area of the battery cell 3 is improved.

[0060] In an embodiment, as shown in Figure 4 , the middle region B1 of the second folded edge 22 and the two ends of the second folded edge 22 are connected by an arc segment, so that the second folded edge 22 is easy to be injection molded.

[0061] In an embodiment, as shown in Figure 1 and Figure 2 The second surface 12 is a side surface of the insulating body 10 away from the folding edge 20, and the second surface 12 is provided with a plurality of positioning grooves 121, the distance between the positioning grooves 121 and the center of the insulating body 10 is greater than the minimum distance between the positioning grooves 121 and the side wall of the insulating body 10.

[0062] The surface of the positioning groove 121 is recessed relative to the second surface 12. Please refer to Figure 5 When the insulating piece 1 is applied to the battery pack 2, the second surface 12 is in contact with the end plate 4, and the positioning grooves 121 of the second surface 12 are used to accommodate adhesive materials, which can be glue and the like. The adhesive material can be formed at the positioning groove 121 by a dispensing process. The adhesive material is used to achieve the adhesive fixation between the second surface 12 of the insulating piece 1 and the end plate 4.

[0063] In order to ensure the reliability of the adhesion, as shown in Figure 2 The positioning grooves 121 can be arranged close to the four corners of the insulating body 10, that is, the distance between the positioning grooves 121 and the center of the insulating body 10 is greater than the minimum distance between the positioning grooves 121 and the side wall of the insulating body 10. By arranging the positioning grooves 121, on the one hand, part of the adhesive material can be accommodated, and on the other hand, the dispensing position can be indicated to improve the reliability and consistency of the adhesion.

[0064] In an embodiment, as shown in Figure 1 and Figure 3 The first surface 11 is provided with a plurality of positioning bosses 111, and the positioning bosses 111 are arranged in position with the positioning grooves 121.

[0065] Please refer to Figure 5 When the insulating piece 1 is applied to the battery pack 2, the first surface 11 is in contact with the battery cell 3, and the positioning bosses 111 of the first surface 11 can be provided with adhesive materials, which are used to achieve the adhesive fixation between the insulating piece 1 and the battery cell 3.

[0066] The positioning bosses 111 are arranged in position with the positioning grooves 121, that is, the positioning bosses 111 coincide with the positioning grooves 121. By arranging the positioning grooves 121 on one side surface of the insulating body 10 and the positioning bosses 111 on the other side surface, the thickness of the positioning groove 121 area can be appropriately increased, and the insulation effect of the insulating body 10 on the battery cell 3 and the end plate 4 is ensured. Avoiding that the thickness of the positioning groove 121 is too small after arranging the positioning groove 121, which is easy to break and cause the electrical connection between the battery cell 3 and the end plate 4.

[0067] In other embodiments, the first surface 11 can be provided with the positioning grooves 121, and the second surface 12 can be provided with the positioning bosses 111.

[0068] In some other embodiments, the first surface 11 and the second surface 12 can each be provided with a positioning groove 121.

[0069] In some other embodiments, the first surface 11 and the second surface 12 can each be provided with a positioning boss 111.

[0070] In an embodiment, the thickness of the insulating body 10 is greater than the thickness of the folded edge 20. Through the above arrangement, the insulating piece 1 can be easily injection molded.

[0071] For example, the thickness of the insulating body 10 can be greater than or equal to 1.5 millimeters, and the thickness of the folded edge 20 can be greater than or equal to 1.0 millimeter.

[0072] In a second aspect, as shown in the drawings, the embodiment of the utility model provides a battery pack 2, the battery pack 2 includes electric core 3, end plate 4 and the insulating piece 1 described above, the insulating piece 1 is arranged between electric core 3 and end plate 4, and the folded edge 20 is located at the side of the insulating body 10 close to electric core 3. Figure 5

[0073] As shown in the drawings, the large end surface of a plurality of electric cores 3 is close to each other, and the end plate 4 is arranged corresponding to the large end surface of the electric core 3, the insulating piece 1 is arranged between the end plate 4 and the electric core 3, and the folded edge 20 is located at the side of the insulating body 10 close to the electric core 3. The first folded edge 21 is in abutment with the small end surface of the electric core 3, and the second folded edge 22 is in abutment with the cover plate of the electric core 3. The width w2 of the middle region B1 of the second folded edge 22 is less than the width w3 of the two ends of the second folded edge 22, thereby avoiding the bus bar 31, thereby avoiding the interference between the second folded edge 22 and the bus bar 31. Figure 5 The end plate 4 is arranged at the side of the insulating piece 1 away from the electric core 3. The steel belt 5 is arranged around the periphery of the end plate 4 and the electric core 3 to fix the end plate 4 and the electric core 3. The number of the steel belt 5 can be two, and the two steel belts 5 can be arranged corresponding to the two edge regions B2 of the first folded edge 21, thereby avoiding the interference between the steel belt 5 and the convex structure 211.

[0074] The area of the first surface 11 can be substantially the same as the surface area of the side of the electric core 3 close to the insulating piece 1, thereby avoiding increasing the occupied space of the insulating piece 1. The first folded edge 21 covers the side wall of the electric core 3, and the second folded edge 22 covers the cover plate of the electric core 3, thereby increasing the area of the electric core 3 covered by the insulating piece 1, thereby increasing the creepage distance between the electric core 3 and the end plate 4 to meet the insulation withstand voltage requirement of the battery pack 2.

[0075]

[0076] ​​The above has carried out the detailed introduction to the embodiment of the utility model, the principle and implementation mode of the utility model have been described in this article by applying specific examples, the above embodiment explanation is only for helping understanding the method and its core thought of the utility model; simultaneously, for the technical personnel in the art, according to the thought of the utility model, there will be changes in specific implementation mode and application range, and on the above, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. An insulating piece (1), characterized in that, The application relates to an insulation piece (1) comprising: an insulation body (10) having a first surface (11) and a second surface (12) opposite to each other along the thickness direction of the insulation body (10); at least one folded edge (20) connected to the edge of the insulation body (10), the folded edge (20) extending in a direction away from the first surface (11).

2. The insulating piece (1) according to claim 1, characterized in that The folded edge (20) comprises first folded edges (21) arranged on opposite sides of the insulation body (10), and the side surfaces of the two first folded edges (21) away from each other are provided with a plurality of protruding structures (211).

3. Insulation (1) according to claim 2, characterized in that The plurality of protruding structures (211) are arranged along the length direction of the first folded edge (21), and the size of the protruding structure (211) in the width direction of the first folded edge (21) is the same as the width of the first folded edge (21).

4. The insulating piece (1) according to claim 3, characterized in that The first folded edge (21) has a middle region and an edge region arranged along the length direction of the first folded edge (21), and the edge region is located on both sides of the middle region, and the plurality of protruding structures (211) are located in the middle region.

5. Insulation (1) according to any one of claims 1 to 4, characterized in that The folded edge (20) further comprises a second folded edge (22) connecting the two first folded edges (21), and the average width of the second folded edge (22) is less than or equal to the average width of the first folded edge (21).

6. The insulating piece (1) according to claim 5, characterized in that The width of the two ends of the second folded edge (22) is greater than the width of the middle region of the second folded edge (22), and the width of the two ends of the second folded edge (22) is equal to the width of the first folded edge (21).

7. Insulation (1) according to any one of claims 1 to 4, characterized in that The second surface (12) is the side surface of the insulation body (10) away from the folded edge (20), and the second surface is provided with a plurality of positioning grooves (121), and the distance between the positioning grooves (121) and the center of the insulation body (10) is greater than the minimum distance between the positioning grooves (121) and the side wall of the insulation body (10).

8. The insulating piece (1) according to claim 7, characterized in that The first surface (11) is provided with a plurality of positioning bosses (111), and the positioning bosses (111) are arranged in position with the positioning grooves (121).

9. Insulation (1) according to any one of claims 1 to 4, characterized in that The thickness of the insulation body (10) is greater than the thickness of the folded edge (20).

10. A battery pack, characterized by, The application further relates to a battery cell (3), an end plate (4) and the insulation piece (1) as claimed in any one of claims 1 to 9, the insulation piece (1) is arranged between the battery cell (3) and the end plate (4), and the folded edge (20) is located on the side of the insulation body (10) close to the battery cell (3).

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