Bottom supporting piece, battery cell, battery pack and power utilization device

Abstract

The utility model provides a cork base piece, battery cell, battery pack, electricity utilization device, the cork base piece includes: cork base piece body, has opposite first surface and second surface, on the first surface is provided with first vent groove, the first vent groove passes through the two edge of first surface along the first direction, the first vent groove passes through the second surface along the second direction, the second vent groove passes through the second surface along the second direction. The second surface is provided with a second exhaust groove, and the second exhaust groove penetrates through the two edges of the second surface in the second direction. According to the utility model, the first exhaust groove and the second exhaust groove are respectively formed in the first surface and the second surface which are arranged back to back, so that the plane shape of the bottom supporting sheet is changed, the air permeability of the bottom supporting sheet is improved, the pressure can be released in time when a violent reaction occurs in the battery cell, and the pressure release capability of the battery cell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a bottom support sheet, a battery core, a battery pack and an electric device. Background Art

[0002] As part of the main structural parts of the battery cell, the bottom support is integrated inside the battery cell and located between the battery cell pole group and the battery cell shell. It mainly plays an insulating and anti-collision role. The existing battery cell bottom support adopts a flat structure. During the use of the battery cell, the flat bottom support will cover the explosion-proof valve at the bottom of the battery cell, hindering the pressure relief, thus making the pressure relief channel design ineffective. Utility Model Content

[0003] The embodiments of the utility model provide a bottom support sheet, a battery cell, a battery pack, and an electrical device, which can improve the technical problem of hindering pressure release in the existing battery cell bottom support sheet.

[0004] In a first aspect, an embodiment of the present utility model provides a bottom support sheet, comprising:

[0005] The bottom support sheet body has a first surface and a second surface arranged opposite to each other. The first surface is provided with a first exhaust groove, which runs through the two edges of the first surface along a first direction. The second surface is provided with a second exhaust groove, which runs through the two edges of the second surface along a second direction.

[0006] In an embodiment of the utility model, by respectively opening a first exhaust groove and a second exhaust groove on the first surface and the second surface of the bottom support sheet that are arranged opposite to each other, the planar shape of the bottom support sheet is changed, the air permeability of the bottom support sheet is increased, and the pressure can be released in time when a violent reaction occurs inside the battery cell, thereby improving the pressure release capacity of the battery cell.

[0007] In one embodiment, the bottom support sheet is a rectangular sheet, and the first exhaust groove extends along the width direction of the bottom support sheet body; and / or

[0008] The second exhaust groove extends along the length direction of the bottom supporting piece body.

[0009] In an embodiment of the utility model, the first surface of the bottom support sheet having the first exhaust groove is in contact with the core package, and by extending the first exhaust groove along the width direction of the bottom support sheet body, the pole piece arranged along the length direction of the bottom support sheet body can be prevented from falling into the first exhaust groove, thereby avoiding the influence on the core package structure, and further ensuring the support strength of the bottom support sheet to the core package. By extending the second exhaust groove along the length direction of the bottom support sheet body, the extension directions of the second exhaust groove and the second exhaust groove can be different, so that exhaust and pressure relief can be performed from different directions, while ensuring the structural strength of the bottom support sheet and the support strength of the bottom support sheet to the core package.

[0010] In one embodiment, the extension direction of the first exhaust groove is parallel to the width direction of the bottom support sheet body; and / or

[0011] The extending direction of the second exhaust groove is parallel to the length direction of the bottom supporting piece body.

[0012] In an embodiment of the utility model, the extension direction of the first exhaust groove is parallel to the width direction of the bottom support sheet body, and the extension direction of the second exhaust groove is parallel to the length direction of the bottom support sheet body, so that the extension direction of the first exhaust groove can be perpendicular to the setting direction of the pole piece, and the extension direction of the first exhaust groove is perpendicular to the extension direction of the second exhaust groove, which can ensure the structural strength of the bottom support sheet and the supporting strength of the bottom support sheet to the core package, and at the same time, the pressure relief path is shorter.

[0013] In one embodiment, a plurality of the first exhaust grooves are provided, and the plurality of the first exhaust grooves are parallel to each other; and / or

[0014] A plurality of the second exhaust grooves are provided, and the plurality of the second exhaust grooves are parallel to each other.

[0015] In the embodiment of the utility model, a plurality of mutually parallel first exhaust grooves and a plurality of mutually parallel second exhaust grooves can release pressure more efficiently and more evenly.

[0016] In one embodiment, a plurality of groups of the first exhaust grooves are provided, each group of the first exhaust grooves includes a plurality of mutually parallel first exhaust grooves, and a suction area for sucking the bottom support sheet is provided between the plurality of groups of the first exhaust grooves; and / or

[0017] The second exhaust grooves are parallel to each other and are distributed on the second surface at equal intervals.

[0018] In the embodiment of the utility model, according to the pressure relief characteristics of the battery cell in the width direction, multiple groups of first exhaust grooves can be arranged along the width direction of the bottom support sheet, so as to ensure the pressure relief effect and the support strength of the bottom support sheet, and the area between the multiple groups of first exhaust grooves can be used to absorb the bottom support sheet through the suction cup when installing the bottom support sheet. By distributing the second exhaust grooves on the second surface in parallel and at equal intervals, the pressure relief of the bottom support sheet in the length direction can be made more uniform.

[0019] In one embodiment, three groups of the first exhaust grooves are provided, and the three groups of the first exhaust grooves are respectively provided at both ends and a middle portion of the bottom support sheet body in the length direction.

[0020] In the embodiment of the utility model, by respectively arranging a group of first exhaust grooves at both ends and the middle of the bottom support sheet body in the length direction, the pressure relief characteristics of the core package can be adapted and the pressure relief effect of the bottom support sheet can be improved.

[0021] In one embodiment, a pressure relief hole is formed on the bottom supporting sheet body, and the pressure relief hole penetrates the first surface and the second surface of the bottom supporting sheet body along the thickness direction of the bottom supporting sheet body.

[0022] In the embodiment of the present utility model, by opening a pressure relief hole on the bottom support sheet body, the pressure relief effect of the bottom support sheet can be improved.

[0023] In one embodiment, the pressure relief hole is disposed in the first exhaust groove.

[0024] In the embodiment of the utility model, by arranging the pressure relief hole in the first exhaust groove, the gas discharged along the first exhaust groove can quickly enter the explosion-proof valve through the pressure relief hole and be discharged.

[0025] In one embodiment, the pressure relief hole is disposed at the intersection of the first exhaust groove and the second exhaust groove.

[0026] In an embodiment of the utility model, by arranging the pressure relief hole at the intersection of the first exhaust groove and the second exhaust groove, the gas exhausted in the first exhaust groove can enter the second exhaust groove from the pressure relief hole, and then quickly enter the explosion-proof valve along the second exhaust groove and be discharged.

[0027] In one embodiment, the total thickness of the bottom support sheet is equal to the sum of the depths of the first exhaust groove and the second exhaust groove.

[0028] In an embodiment of the utility model, by setting the total thickness of the bottom support sheet to be equal to the sum of the depths of the first exhaust groove and the second exhaust groove, the pressure relief hole can be naturally formed after the first exhaust groove and the second exhaust groove are processed, thereby eliminating the need to further process the pressure relief hole.

[0029] In one embodiment, the depth of the first exhaust groove is the same as the depth of the second exhaust groove.

[0030] In a second aspect, an embodiment of the present utility model provides a battery cell, comprising the above-mentioned bottom support sheet.

[0031] In one embodiment, the battery cell includes a bottom support sheet body, a core package and a shell, the core package is arranged in the shell, the bottom support sheet body is arranged between the core package and the shell, and an explosion-proof valve is arranged in the middle of the surface of the shell that contacts the bottom support surface.

[0032] In a third aspect, an embodiment of the present invention provides a battery pack, comprising the above-mentioned battery cell.

[0033] In a fourth aspect, an embodiment of the utility model provides an electrical device, comprising the above-mentioned battery cell or the above-mentioned battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 It is a three-dimensional schematic diagram of a bottom support sheet provided in an embodiment of the utility model;

[0036] Figure 2 It is a bottom view of the bottom support sheet provided by the embodiment of the utility model;

[0037] Figure 3 It is a top view of the bottom support sheet provided in the embodiment of the utility model;

[0038] Figure 4 It is an exploded diagram of a battery cell provided in an embodiment of the utility model.

[0039] Description of the drawings: 10 - bottom support body, 11 - first surface, 12 - second surface, 13 - first exhaust groove, 14 - second exhaust groove, 15 - pressure relief hole, 16 - suction area, 20 - core package, 30 - shell, 31 - explosion-proof valve. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0041] First, see Figures 1 to 3 , an embodiment of the utility model provides a bottom support sheet, comprising:

[0042] The bottom support sheet body 10 has a first surface 11 and a second surface 12 disposed opposite to each other. The first surface 11 is provided with a first exhaust groove 13, which passes through two edges of the first surface 11 along a first direction. The second surface 12 is provided with a second exhaust groove 14, which passes through two edges of the second surface 12 along a second direction.

[0043] It can be understood that the first direction and the second direction can be the same or different. The first exhaust groove 13 can pass through the two opposite edges of the first surface 11 along the first direction, or the first exhaust groove 13 can pass through the two adjacent edges of the first surface 11 along the first direction. The second exhaust groove 14 can pass through the two opposite edges of the second surface 12 along the second direction, or the second exhaust groove 14 can pass through the two adjacent edges of the second surface 12 along the second direction. The width and depth of the first exhaust groove 13 and the second exhaust groove 14 can be set according to the size of the bottom support sheet, the pressure relief requirements of the battery cell, the support strength requirements of the core package, etc. The thickness of the bottom support sheet can be set according to the size of the battery cell, the pressure relief requirements of the battery cell, the support strength requirements of the core package, etc.

[0044] In one embodiment, the bottom support sheet is a rectangular sheet, and the first exhaust groove 13 extends along the width direction of the bottom support sheet body 10; and / or

[0045] The second exhaust groove 14 extends along the length direction of the bottom supporting plate body 10 .

[0046] It can be understood that the first exhaust groove 13 extends along the width direction of the bottom support sheet body 10. The first exhaust groove 13 can be a linear groove, and the extension direction of the first exhaust groove 13 is the same as the width direction of the bottom support sheet body 10. The first exhaust groove 13 can also be a linear groove, and the angle between the extension direction of the first exhaust groove 13 and the width direction of the bottom support sheet body 10 is less than or equal to 45°. The first exhaust groove 13 can also be a curved groove, and the first exhaust groove 13 extends along the width direction of the bottom support sheet body 10. The second exhaust groove 14 extends along the length direction of the bottom support sheet body 10. The second exhaust groove 14 can be a linear groove, and the extension direction of the second exhaust groove 14 is the same as the length direction of the bottom support sheet body 10. The second exhaust groove 14 can also be a linear groove, and the angle between the extension direction of the second exhaust groove 14 and the length direction of the bottom support sheet body 10 is less than or equal to 45°. The second exhaust groove 14 can also be a curved groove, and the second exhaust groove 14 extends along the length direction of the bottom support sheet body 10.

[0047] In one embodiment, the extending direction of the first exhaust groove 13 is parallel to the width direction of the bottom support sheet body 10; and / or

[0048] The extending direction of the second exhaust groove 14 is parallel to the length direction of the bottom supporting plate body 10 .

[0049] It can be understood that when the first exhaust groove 13 is perpendicular to the second exhaust groove 14, the structural strength of the bottom support sheet itself is stronger, and the support strength it can improve is also stronger. When the extension direction of the first exhaust groove 13 is parallel to the width direction of the bottom support sheet body 10, it is perpendicular to the setting direction of the pole piece, which can effectively prevent the pole piece from falling into the first exhaust groove 13.

[0050] In one embodiment, a plurality of the first exhaust grooves 13 are provided, and the plurality of the first exhaust grooves 13 are parallel to each other; and / or

[0051] A plurality of the second exhaust grooves 14 are provided, and the plurality of the second exhaust grooves 14 are parallel to each other.

[0052] It can be understood that the number and spacing of the first exhaust grooves 13 and the second exhaust grooves 14 can be set according to the size of the battery cell, the pressure relief requirement, etc.

[0053] In one embodiment, a plurality of groups of the first exhaust grooves 13 are provided, each group of the first exhaust grooves 13 includes a plurality of mutually parallel first exhaust grooves 13, and a suction area 16 for sucking the bottom support sheet is provided between the plurality of groups of the first exhaust grooves 13; and / or

[0054] The second exhaust grooves 14 are parallel to each other and are distributed on the second surface 12 at equal intervals.

[0055] It can be understood that the number of groups and the location of the first exhaust grooves 13 can be set according to the pressure relief characteristics of the battery cell in the width direction. The suction area 16 is the area between two adjacent groups of first exhaust grooves 13. No first exhaust grooves 13 are set in this area. The suction cup can be used to absorb the bottom support sheet for installation of the bottom support sheet. The size of the suction area 16 can be designed according to the needs of the suction cup.

[0056] In one embodiment, three groups of the first exhaust grooves 13 are provided, and the three groups of the first exhaust grooves 13 are respectively provided at both ends and the middle portion of the bottom support sheet body 10 in the length direction.

[0057] It can be understood that the number and spacing of the first exhaust grooves 13 in the three groups of first exhaust grooves 13 can be the same or different, and can be set according to the pressure relief characteristics of different positions of the core package.

[0058] In one embodiment, a pressure relief hole 15 is formed on the bottom support sheet body 10 , and the pressure relief hole 15 penetrates the first surface 11 and the second surface 12 of the bottom support sheet body 10 along the thickness direction of the bottom support sheet body 10 .

[0059] It can be understood that the size, shape and location of the pressure relief hole 15 can be set according to the pressure relief characteristics of the core package.

[0060] In one embodiment, the pressure relief hole 15 is disposed in the first exhaust groove 13 .

[0061] It can be understood that the pressure relief holes 15 can be evenly distributed or unevenly distributed in the first exhaust groove 13, and can be arranged according to the pressure relief characteristics of different positions of the core package.

[0062] In one embodiment, the pressure relief hole 15 is disposed at the intersection of the first exhaust groove 13 and the second exhaust groove 14 .

[0063] In one embodiment, the total thickness of the bottom support sheet is equal to the sum of the depths of the first exhaust groove 13 and the second exhaust groove 14 .

[0064] It can be understood that by setting the total thickness of the bottom support sheet to be equal to the sum of the depths of the first exhaust groove 13 and the second exhaust groove 14, the pressure relief hole 15 can be naturally formed after the first exhaust groove 13 and the second exhaust groove 14 are processed, and the length and width of the naturally formed pressure relief hole 15 are the same as the width of the first exhaust groove 13 and the second exhaust groove 14, respectively.

[0065] In one embodiment, the depth of the first exhaust groove 13 is the same as the depth of the second exhaust groove 14 .

[0066] Second, see Figure 4 An embodiment of the utility model provides a battery cell, including the above-mentioned bottom support sheet.

[0067] In one embodiment, the battery cell includes a bottom support sheet body 10, a core package 20, and an outer shell 30. The core package 20 is arranged in the outer shell 30, and the bottom support sheet body 10 is arranged between the core package 20 and the outer shell 30. An explosion-proof valve 31 is arranged in the middle of the surface of the outer shell 30 that contacts the bottom support surface.

[0068] In a third aspect, an embodiment of the present invention provides a battery pack, comprising the above-mentioned battery cell.

[0069] In a fourth aspect, an embodiment of the utility model provides an electrical device, comprising the above-mentioned battery cell or the above-mentioned battery pack.

[0070] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A bottom support sheet, characterized in that: include: The bottom support sheet body has a first surface and a second surface arranged opposite to each other. The first surface is provided with a first exhaust groove, which runs through the two edges of the first surface along a first direction. The second surface is provided with a second exhaust groove, which runs through the two edges of the second surface along a second direction.

2. The bottom support sheet according to claim 1, characterized in that: The bottom support sheet is in a rectangular sheet shape, and the first exhaust groove extends along the width direction of the bottom support sheet body; and / or The second exhaust groove extends along the length direction of the bottom supporting piece body.

3. The bottom support sheet according to claim 2, characterized in that: The extending direction of the first exhaust groove is parallel to the width direction of the bottom support sheet body; and / or The extending direction of the second exhaust groove is parallel to the length direction of the bottom supporting piece body.

4. The bottom support sheet according to claim 1, characterized in that: A plurality of the first exhaust grooves are provided, and the plurality of the first exhaust grooves are parallel to each other; and / or A plurality of the second exhaust grooves are provided, and the plurality of the second exhaust grooves are parallel to each other.

5. The bottom support sheet according to claim 1, characterized in that: The first exhaust grooves are provided in a plurality of groups, each group of the first exhaust grooves comprises a plurality of mutually parallel first exhaust grooves, and a suction area for sucking the bottom support sheet is provided between the plurality of groups of the first exhaust grooves; and / or The second exhaust grooves are parallel to each other and are distributed on the second surface at equal intervals.

6. The bottom support sheet according to claim 5, characterized in that: The first exhaust grooves are arranged in three groups, and the three groups of the first exhaust grooves are respectively arranged at both ends and the middle part of the bottom support sheet body in the length direction.

7. The bottom support sheet according to claim 1, characterized in that: The bottom support sheet body is provided with a pressure relief hole, and the pressure relief hole penetrates the first surface and the second surface of the bottom support sheet body along the thickness direction of the bottom support sheet body.

8. The bottom support sheet according to claim 7, characterized in that: The pressure relief hole is disposed in the first exhaust groove.

9. The bottom support sheet according to claim 8, characterized in that: The pressure relief hole is arranged at the intersection of the first exhaust groove and the second exhaust groove.

10. The bottom support sheet according to claim 8, characterized in that: The total thickness of the bottom support sheet is equal to the sum of the depths of the first exhaust groove and the second exhaust groove.

11. A battery cell, characterized in that: It comprises the bottom support sheet as described in any one of claims 1 to 10.

12. A battery pack, characterized in that: Comprising the battery cell as claimed in claim 11.

13. An electrical device, characterized in that: Includes the battery cell as claimed in claim 11 or includes the battery pack as claimed in claim 12.

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