Battery cell, battery, electronic equipment and vehicle

Abstract

The utility model relates to a battery cell, a battery, electronic equipment and a vehicle. The battery cell comprises a battery cell body and a bonding piece. The battery cell body comprises a plurality of laminations which are stacked along the thickness direction, and the plurality of laminations are respectively a positive pole piece, a negative pole piece and an isolating membrane for separating the positive pole piece from the negative pole piece. The bonding piece is wound on the edge of the battery cell body, one end of the bonding piece is bonded to the uppermost layer of lamination in the battery cell body, the other end of the bonding piece is bonded to the lowermost layer of lamination in the battery cell body, and the bonding piece is provided with a hole for electrolyte to immerse into the battery cell body. According to the scheme, the movement of the laminations in the battery cell body can be reduced, and the infiltration of electrolyte cannot be hindered.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more particularly, to a battery cell, a battery, an electronic device, and a vehicle. Background Art

[0002] The application of stacked bare battery cells is becoming increasingly widespread. However, after a drop test, it has been revealed that the stacked battery cells are prone to internal movement, resulting in battery cell failure. After the battery cell fails, it will greatly affect the performance of the battery cell and seriously affect the service life of the battery. Summary of the Invention

[0003] The present application provides a battery cell, a battery, an electronic device, and a vehicle, which can reduce the movement of the stacked sheets inside the battery cell and does not hinder the infiltration of the electrolyte, so as to reduce the risk of failure.

[0004] A battery cell includes:

[0005] A battery cell body including a plurality of stacked sheets stacked in the thickness direction, the plurality of stacked sheets being a positive electrode sheet, a negative electrode sheet, and a separator membrane separating the positive electrode sheet and the negative electrode sheet;

[0006] An adhesive member wrapped around the edge of the battery cell body, one end of the adhesive member being adhered to the uppermost stacked sheet in the battery cell body, and the other end being adhered to the lowermost stacked sheet in the battery cell body, and the adhesive member being provided with holes for the electrolyte to penetrate into the battery cell body.

[0007] Optionally, the adhesive member includes a first end adhered to the uppermost stacked sheet, a second end adhered to the lowermost stacked sheet, and an intermediate portion connecting the first end and the second end, and the intermediate portion is provided with the holes.

[0008] Optionally, the battery cell further includes a film layer made of a porous material, the film layer being adhered to a side of the adhesive member facing the battery cell body, and a through hole penetrating in the thickness direction of the film layer is provided at a position corresponding to the holes, and the area of the through hole is smaller than the area of the holes.

[0009] Optionally, the film layer is provided with a boss, the boss is inserted into the holes, and the through hole is provided at the boss of the film layer.

[0010] Optionally, the adhesive member includes a first end adhered to the uppermost stacked sheet in the battery cell body, a second end adhered to the lowermost stacked sheet in the battery cell body, and an intermediate portion connecting the first end and the second end, and the film layer is adhered to the intermediate portion.

[0011] Optionally, the radius of the holes is 0.5 mm to 5 mm, and the radius of the through hole is 0.3 mm to 4.8 mm.

[0012] Optionally, a plurality of the holes are provided, a plurality of the through holes are provided, and the holes and the through holes are arranged in one-to-one correspondence.

[0013] Optionally, a plurality of the bonding members are provided, and the plurality of bonding members are distributed at intervals and surround the edge of at least one side of the battery cell body.

[0014] Optionally, the plurality of bonding members surround the edge of the periphery of the battery cell body.

[0015] A battery, comprising:

[0016] A housing;

[0017] An electrolyte filled in the housing;

[0018] The battery cell as described in any one of the above, the battery cell is encapsulated in the housing and immersed in the electrolyte.

[0019] An electronic device, comprising the battery as described above.

[0020] A vehicle, comprising the battery as described above.

[0021] The present application provides a battery cell, a battery, an electronic device and a vehicle. Among them, the bonding member surrounds the edge of the battery cell body and is bonded to the uppermost laminated sheet and the lowermost laminated sheet in the battery cell body respectively. This adhesive force can act on a plurality of laminated sheets in the thickness direction of the battery cell body, so that the plurality of laminated sheets are mutually extruded and in close contact, which can reduce the risk of the laminated sheets moving. In addition, the holes are designed based on the capillary penetration principle, which can play a promoting role during the electrolyte infiltration process, thereby accelerating the infiltration of the electrolyte into the battery cell body and reducing the risk of battery cell failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of a battery cell shown in an exemplary embodiment of the present application;

[0023] Figure 2 is Figure 1 a schematic diagram of the bonding member shown in;

[0024] Figure 3 is a schematic diagram of the bonding member provided with a film layer;

[0025] Figure 4 is Figure 3 the A-A view in; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Here, in conjunction with the accompanying drawings, the technical solutions in the embodiments (or "embodiments") of the present application will be clearly and completely described. When the following description involves the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0027] If there are terms related to directional indications or positional relationships in the embodiments of the present application (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, lateral, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), then such terms are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture (as shown in the accompanying drawings); if this specific posture changes, then the directional indication or positional relationship will also change accordingly. In addition, the terms "first", "second", etc. involved in the embodiments of the present application are only for the purpose of convenient description and cannot be understood as indicating or implying relative importance.

[0028] Please refer to Figure 1 , Figure 1 , which is a schematic diagram of the battery cell 100 shown in an exemplary embodiment of the present application.

[0029] The present application provides a battery cell 100, which includes a battery cell body 10 and an adhesive member 20.

[0030] The battery cell body 10 includes a plurality of stacked laminates stacked in the thickness direction. The plurality of laminates are respectively a positive electrode plate, a negative electrode plate, and a separator membrane separating the positive electrode plate and the negative electrode plate. The positive electrode plate is insulated from the negative electrode plate through the separator membrane. The plurality of laminates can be cut into rectangular laminates of equal size and the same shape, but are not limited thereto. There are multiple sheets of the positive electrode plate, the negative electrode plate, and the separator membrane. The positive electrode tab of the battery cell body 10 is led out from each positive electrode plate, and the negative electrode tab is led out from each negative electrode plate, forming a laminated tab structure.

[0031] The adhesive member 20 wraps around the edge of the battery cell body 10. One end of the adhesive member 20 is bonded to the uppermost laminate in the battery cell body 10, and the other end is bonded to the lowermost laminate in the battery cell body 10. The adhesive member 20 is provided with holes 201 for the electrolyte to penetrate into the battery cell body 10. The number of the holes 201 is not limited.

[0032] According to the above description, the bonding member 20 wraps around the edge of the battery cell body 10 and is bonded to the uppermost stack and the lowermost stack in the battery cell body 10 respectively. This bonding force can act on multiple stacks in the thickness direction of the battery cell body 10, causing the multiple stacks to be squeezed against each other and in close contact, which can reduce the risk of the stacks shifting. In addition, the holes 201 are designed based on the capillary penetration principle, forming void channels to promote and accelerate the infiltration of the electrolyte, reducing the failure risk of the battery cell 100.

[0033] Please refer to Figure 2 , Figure 2 for Figure 1 the schematic diagram of the bonding member 20 shown in

[0034] The bonding member 20 includes a first end portion 22 at one end and a second end portion 23 at the other end. The first end portion 22 is bonded to the uppermost stack of the battery cell body 10, and the second end portion 23 is bonded to the lowermost stack of the battery cell body 10. Among them, the creases L1 and L2 are the first bending position and the second bending position respectively when the bonding member 20 wraps around the edge of the battery cell body 10.

[0035] The bonding member 20 further includes an intermediate portion 24 between the crease L1 and the crease L2. The intermediate portion 24 connects the first end portion 22 and the second end portion 23. In Figure 2 the embodiment shown, the holes 201 are provided on the intermediate portion 24 of the bonding member 20 excluding the first end portion 22 and the second end portion 23. With this arrangement, no holes are opened at the first end portion 22 and the second end portion 23, and holes are only opened at the intermediate portion 24, which can increase the bonding area and bonding firmness between the first end portion 22 and the uppermost stack and between the second end portion 23 and the lowermost stack. In addition, the intermediate portion 24 faces the lamination surface of multiple stacks at the edge of the battery cell body 10. By opening the holes 201 in the intermediate portion 24, the electrolyte can more quickly and directly penetrate between the multiple stacks, improving the infiltration efficiency.

[0036] In one embodiment, as Figure 1 shown, a plurality of the bonding members 20 may be provided. The plurality of bonding members 20 are spaced apart and wrap around the edge of at least one side of the battery cell body 10. With this arrangement, the size of a single bonding member 20 is relatively small, which is more convenient for the bonding member 20 to be bonded and fixed to the battery cell body 10.

[0037] In an alternative embodiment, a plurality of bonding members 20 may be spaced apart and wrapped around the edges of the periphery of the cell body 10. That is, except for the positions where the positive electrode tab and the negative electrode tab are located, the periphery of the cell body 10 can be adhesively fixed by the bonding members 20, so as to further reduce the risk of the stacked sheets moving, and enable the electrolyte to simultaneously penetrate between the multiple stacked sheets through the holes 201 at different positions.

[0038] Please refer to Figure 3 and Figure 4 , Figure 3 which is a schematic diagram of the bonding member 20 provided with the film layer 30. Figure 4 is Figure 3 the A-A view in

[0039] In an embodiment, the cell 100 further includes a film layer 30 made of a porous material. The film layer 30 is bonded to the side of the bonding member 20 facing the cell body 10. A through hole 301 penetrating in the thickness direction of itself is provided at a position corresponding to the hole 201 of the film layer 30, and the area of the through hole 301 is smaller than the area of the hole 201. With such a setting, the film layer 30 made of a porous material is more likely to infiltrate the electrolyte, and the capillary effect ability of the hole 201 can be improved through the through hole 301 on the film layer 30. The film layer 30 can be made of polyethylene material, but is not limited thereto.

[0040] In an alternative embodiment, the hole 201 may be set as a round hole, and the radius of the hole 201 is 0.5 mm to 5 mm. For example, it may be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm. The through hole 301 is a round hole, and the radius of the through hole 301 is 0.3 mm to 4.8 mm. For example, it may be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 2 mm, 3 mm, 4 mm, 4.5 mm, 4.8 mm. This can ensure the capillary effect.

[0041] In order not to interfere with the bonding of the bonding member 20 to the cell body 10, the area of the film layer 30 is smaller than the area of the bonding member 20. More precisely, the film layer 30 may be adhesively bonded only to the middle portion 24 of the bonding member 20.

[0042] In one embodiment, in order to increase the firmness of the adhesion between the adhesive member 20 and the film layer 30, the film layer 30 is provided with a boss 302 protruding toward the side where the adhesive member 20 is located. The boss 302 is inserted into the hole 201, and the film layer 30 is provided with the through hole 301 at the boss 302. With this arrangement, the boss 302 is nested in the hole 201. While increasing the connection firmness, the film layer 30 of the porous material forms the inner wall of the hole 201, so that it can better assist the battery cell body 10 to absorb and soak the electrolyte.

[0043] In Figure 3 and Figure 4 In the illustrated embodiment, there are a plurality of the holes 201 and a plurality of the through holes 301. The holes 201 and the through holes 301 are arranged in one-to-one correspondence, so that a multi-channel capillary effect can be formed, and the electrolyte can be more fully soaked into the battery cell body 10.

[0044] The present application also provides a battery (not shown). The battery includes a housing, an electrolyte filled in the housing, and a battery cell 100 immersed in the electrolyte. For example, the electrolyte can be immersed in the battery cell 100 by means of high-temperature standing, but not limited thereto.

[0045] The present application also provides an electronic device, which includes but is not limited to a mobile phone, a tablet computer, a watch, etc. The electronic device includes the battery described above.

[0046] The present application also provides a vehicle, which may be an electric vehicle. The electric vehicle includes the battery described above.

[0047] The foregoing are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, characterized in that: include: The battery cell body comprises a plurality of laminates stacked in a thickness direction, wherein the plurality of laminates are respectively a positive electrode sheet, a negative electrode sheet and a separator separating the positive electrode sheet from the negative electrode sheet; An adhesive is wrapped around the edge of the battery body, one end of the adhesive is bonded to the uppermost laminate in the battery body, and the other end is bonded to the lowermost laminate in the battery body. The adhesive is provided with a hole for electrolyte to be immersed in the battery body.

2. The battery cell according to claim 1, characterized in that: The adhesive member includes a first end portion bonded to the uppermost laminate sheet, a second end portion bonded to the lowermost laminate sheet, and a middle portion connecting the first end portion and the second end portion, wherein the middle portion is provided with the hole.

3. The battery cell according to claim 1, characterized in that: The battery core also includes a film layer made of porous material, which is bonded to the side of the adhesive facing the battery core body. The film layer is provided with a through hole penetrating along its thickness direction at the position corresponding to the hole, and the area of ​​the through hole is smaller than the area of ​​the hole.

4. The battery cell according to claim 3, characterized in that: The film layer is provided with a boss, the boss is inserted into the hole, and the film layer is provided with the through hole at the boss.

5. The battery cell according to claim 4, characterized in that: The radius of the hole is 0.5 mm to 5 mm, and the radius of the through hole is 0.3 mm to 4.8 mm.

6. The battery cell according to claim 3, characterized in that: The adhesive member includes a first end bonded to the uppermost laminate in the battery cell body, a second end bonded to the lowermost laminate in the battery cell body, and a middle portion connecting the first end and the second end, and the film layer is bonded to the middle portion.

7. The battery cell according to claim 3, characterized in that: There are a plurality of holes, there are a plurality of through holes, and the holes are arranged in one-to-one correspondence with the through holes.

8. The battery cell according to any one of claims 1 to 7, characterized in that: A plurality of adhesive members are provided, and the plurality of adhesive members are distributed at intervals and wrapped around the edge of at least one side of the battery cell body.

9. The battery cell according to claim 8, characterized in that: A plurality of adhesive members are wrapped around the edges of the battery cell body.

10. A battery, characterized in that: include: shell; An electrolyte poured into the housing; The battery cell according to any one of claims 1 to 9, wherein the battery cell is encapsulated in the housing and immersed in the electrolyte.

11. An electronic device, characterized in that: Comprising the battery as claimed in claim 10.

12. A vehicle, characterized in that: Comprising the battery as claimed in claim 10.

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