Battery cell and battery pack

Abstract

The utility model provides a battery cell and a battery pack. The battery cell comprises a shell, a cover plate, an insulating film and an insulating patch, wherein at least one end of the shell is provided with an opening; the cover plate is arranged on the shell and is used for blocking the opening; the insulating film wraps the peripheral wall of the shell and is provided with a flanging part folded to the outer side of the peripheral edge of the cover plate, the flanging part comprises two long flangings oppositely arranged on the two sides of the cover plate and two short flangings arranged at the two ends of the cover plate respectively, and an overlapped part is formed between the same ends of the long flangings and the short flangings; the insulating patches are arranged on the outer sides of the two long turnups and connected with the long turnups and the cover plate in an adhesive mode respectively, the two ends of the insulating patches and the short turnups at the same ends are arranged at intervals, and the overlapped part and part of the cover plate are exposed. According to the battery cell disclosed by the utility model, the two ends of the insulating patch and the short turnups at the same end are arranged at intervals, so that the overlapped part and part of the cover plate are exposed, and the insulating patch can be prevented from tilting due to the tilting of the overlapped part of the long turnups and the short turnups.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery core. Meanwhile, the utility model also relates to a battery pack provided with the battery core. Background Art

[0002] Lithium-ion power batteries generally include an internal battery structure and an external battery structure. The internal battery structure mainly includes a battery cell pole group, and the external battery structure mainly includes a battery cell cover, a battery cell shell, and a battery cell insulation component. The battery cell shell provides a space for the battery cell pole group. The battery cell cover and the battery cell shell are welded together to form a closed space. Finally, a layer of insulation components is attached to the surface of the battery cell shell and the surface of the battery cell cover to form a complete battery structure.

[0003] The insulating component on the battery cell shell, namely the blue film, can prevent the metal shell from short-circuiting with the outside, play an insulating role, and also play a protective role to prevent the battery cell shell from being worn and scratched. In addition, since the battery top cover needs to lead out the pole, the insulating component blue film cannot completely wrap the battery cell cover, so a top cover patch is usually attached to the battery cell cover, which has the same function as the insulating film, both of which play an insulating and protective role.

[0004] In the actual production of lithium-ion batteries, due to the coating tolerance of the blue film, a part of the blue film will be left on the top of the battery cell shell, and this part of the surplus is usually folded at the corners of the shell. After the blue film is folded, the corners are prone to warp up, and the upturned corners are prone to warp up with the top cover patch. The upturned top cover patch not only has the risk of battery short circuit, but also affects the bonding of the flexible circuit board of the battery module, thereby causing the battery module to fail. Utility Model Content

[0005] In view of this, the utility model aims to provide a battery core to avoid the problem of the insulating patch warping.

[0006] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0007] A battery cell comprises a shell having an opening at at least one end, a cover plate, an insulating film and an insulating patch arranged on the shell and used to block the opening;

[0008] The insulating film is wrapped around the outer peripheral wall of the shell and has a flange portion folded to the outside of the edges of the cover plate and bonded to the cover plate, the flange portion includes two long flanges arranged on both sides of the cover plate opposite to each other, and two short flanges respectively arranged at both ends of the cover plate, and an overlapping portion is formed between the same ends of the long flange and the short flange;

[0009] The insulating patch is arranged on the outside of the two long flanges and is respectively bonded to the long flanges and the cover plate. The two ends of the insulating patch are spaced apart from the short flanges at the same end, so that the overlapping part and part of the cover plate are exposed.

[0010] Furthermore, the width a of the long flange and / or the short flange satisfies: a≥1.5 mm.

[0011] Furthermore, the spacing b between the end face of the insulating patch and the short flange at the same end satisfies: 2mm≤b≤50mm.

[0012] Furthermore, the width c of the overlapping area between the insulating patch and each of the long flanges satisfies: c≥1.2 mm.

[0013] Furthermore, the distance d between the side of the insulating patch and the root of the long flange on the same side satisfies: 0.3mm≤d<0.5mm.

[0014] Furthermore, it also includes an output pole block arranged outside the cover plate, and the insulating patch is provided with a through hole for exposing the output pole block, and the through hole is arranged in accordance with the shape of the output pole block;

[0015] The distance m between the edge of the through hole and the edge of the output pole block satisfies: 0.3 mm≤m≤1 mm.

[0016] Furthermore, the insulating patch is provided with a first exposure hole for exposing part of the cover plate.

[0017] Furthermore, an explosion-proof valve is provided on the cover plate, and a second exposure hole for exposing the explosion-proof valve is provided on the insulating patch, and the second exposure hole is connected to the first exposure hole.

[0018] Furthermore, the cover plate is provided with an identification portion, and the insulating patch is provided with a third exposure hole for exposing the identification portion; and / or, the cover plate is provided with a liquid injection hole, and the insulating patch is provided with a liquid passage hole connected to the liquid injection hole.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] The battery cell described in the utility model is arranged with a spacing between the two ends of the insulating patch and the short flanges at the same end, so that the overlapping part and part of the cover plate are exposed, which is beneficial to preventing the insulating patch from warping due to the warping of the overlapping part of the long flange and the short flange, thereby helping to improve the firmness of the insulating patch on the cover plate, and further helping to improve the safety of the battery cell.

[0021] In addition, the setting of the numerical range of the width of the long flange and the short flange is conducive to improving the bonding strength of the two on the cover plate, and further helps to prevent the problem that the long flange and the short flange are easy to warp when the bonding fails. The setting of the distance between the end face of the insulating patch and the short flange at the same end can not only meet the insulation withstand voltage requirements of the insulating patch, but also prevent the warping of the overlapping part from affecting the bonding effect of the insulating patch. The setting of the width range of the overlapping area of ​​the insulating patch and the long flange is conducive to ensuring the connection strength between the insulating patch, the long flange and the cover plate, and preventing the connection between the insulating patch and the long flange from warping. The setting of the distance d range between the side of the insulating patch and the root of the long flange on the same side is conducive to reducing the width of the insulating patch while meeting the connection effect of the insulating patch, thereby helping to reduce production costs.

[0022] In addition, the setting of the spacing range between the edge of the through hole for exposing the output pole block on the insulating patch and the edge of the output pole block facilitates the insulating patch to be attached to the cover plate. The setting of the first exposed hole on the insulating patch facilitates the temperature collection component to collect the temperature information of the battery cell through the cover plate; the setting of the second exposed hole facilitates the pressure relief of the explosion-proof valve, so that the second exposed hole is connected to the first exposed hole, which is conducive to the processing and forming of the two. The third exposed hole for exposing the identification part on the insulating patch is conducive to improving the identification effect of the battery cell; the liquid hole on the insulating patch facilitates the electrolyte to enter the injection hole, thereby facilitating the injection of the electrolyte.

[0023] In addition, another object of the present invention is to provide a battery pack, comprising the battery cell as described above.

[0024] The battery pack of the utility model is beneficial to improving the safety of the battery pack by arranging the above-mentioned battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0026] Figure 1 This is a disassembled diagram of the battery cell described in the embodiment of the utility model;

[0027] Figure 2 This is a schematic structural diagram of one end of a battery cell according to an embodiment of the utility model;

[0028] Figure 3 This is a schematic structural diagram of a battery cell end portion without an insulating patch according to an embodiment of the utility model;

[0029] Figure 4 It is a schematic structural diagram of a battery cell end with an insulating patch according to an embodiment of the utility model.

[0030] Description of reference numerals:

[0031] 1. Pole group; 2. Cover plate; 3. Insulation patch; 4. Insulation film; 5. Output pole block; 6. Shell;

[0032] 201. Logo Department;

[0033] 301, third exposed hole; 302, through hole;

[0034] 400, overlapping part; 401, long flange; 402, short flange. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0036] In the description of the present invention, it should be noted that if there are terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc., they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first", "second", etc., they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0038] The present embodiment relates to a battery cell to solve the problem in the prior art that the blue film is warped, which causes the insulating patch 3 to be warped and thus affects the safety of the battery cell.

[0039] In terms of overall structure, the battery cell includes a shell 6 having an opening at at least one end, a cover plate 2 provided on the shell 6 for sealing the opening, an insulating film 4 and an insulating patch 3. The insulating film 4 is wrapped around the outer peripheral wall of the shell 6 and has a flange portion folded to the outside of the edges of the cover plate 2 and bonded to the cover plate 2. The flange portion includes two long flanges 401 arranged on both sides of the cover plate 2 opposite to each other, and two short flanges 402 respectively arranged at both ends of the cover plate 2, and an overlapping portion 400 is formed between the same ends of the long flange 401 and the short flange 402.

[0040] Among them, the insulating patch 3 is arranged on the outside of the two long flanges 401, and is respectively bonded to the long flanges 401 and the cover plate 2. The two ends of the insulating patch 3 are spaced apart from the short flanges 402 at the same end, so that the overlapping part 400 and part of the cover plate 2 are exposed.

[0041] The battery cell described in this embodiment is arranged with a spacing between the two ends of the insulating patch 3 and the short flange 402 at the same end, so that the overlapping part 400 and part of the cover plate 2 are exposed, which helps to prevent the insulating patch 3 from warping due to the warping of the overlapping part 400 of the long flange 401 and the short flange 402, thereby helping to improve the firmness of the insulating patch 3 on the cover plate 2, and further helping to improve the safety of the battery cell.

[0042] Based on the above overall introduction, an exemplary structure of the battery cell described in this embodiment is as follows: Figure 1 and Figure 2 As shown in . The battery cell can be a blade battery cell or a square battery cell. When the battery cell is a blade battery cell, both ends of the shell 6 have openings. When the battery cell is a square battery cell, one end of the shell 6 has an opening. The following is an example of a blade battery cell, wherein the electrode group 1 is located in the shell 6, the cover plate 2 is respectively arranged at each opening, and the insulating patch 3 and the cover plate 2 are arranged on the outside of the cover plate 2 in a one-to-one correspondence.

[0043] like Figures 1 to 3 As shown in , the insulating film 4 is wrapped around the outer peripheral wall of the shell 6, and the length of the insulating film 4 is greater than the length of the shell 6, so that both ends of the insulating film 4 are extended out of the end of the shell 6 to facilitate the formation of the above-mentioned flanged portion. Specifically, the cover plate 2 is installed at the opening, and after the welding with the shell 6 is completed, the extended part of the insulating film 4 is folded on the outside of the cover plate 2, and is bonded to the cover plate 2 to form the above-mentioned flanged portion. Furthermore, the overlapping parts 400 of the long flange 401 and the short flange 402 are also bonded to improve the connection firmness between the overlapping parts 400, so that the overlapping parts 400 are not easy to warp.

[0044] As a preferred embodiment, Figure 3 As shown in , in this embodiment, the width a of the long flange 401 and the short flange 402 both satisfy: a ≥ 1.5 mm. This helps to ensure the bonding firmness between the flange portion and the cover plate 2, thereby further helping to prevent the long flange 401 and the short flange 402 from easily warping up when the bonding fails. In specific implementation, for example, the width a can be 1.5 mm, 1.6 mm, 1.8 mm or 2 mm. It should be noted that the long flange 401 and the short flange 402 have different widths, and the solution that the value of one of the long flange 401 and the short flange 402 satisfies: a ≥ 1.5 mm is also feasible.

[0045] like Figure 4As shown in , in this embodiment, the spacing b between the end face of the insulating patch 3 and the short flange 402 at the same end satisfies: 2mm≤b≤50mm. In this way, while meeting the insulation withstand voltage requirements of the insulating patch 3, the warping of the overlapping portion 400 can also be prevented from affecting the bonding effect of the insulating patch 3. In specific implementation, the spacing b between the end face of the insulating patch 3 and the short flange 402 at the same end can be, for example, 2mm, 5mm, 15mm, 25mm, 35mm, 45mm, or 50mm.

[0046] In this embodiment, after the overlapping portion 400 is lifted, the adhesion strength of the peripheral long flange 401 and the short flange 402 is easily affected. When the value of the spacing b is less than 2 mm, the insulating patch 3 is easily indirectly affected by the lifting problem of the overlapping portion 400. When the value of the spacing b is greater than 50 mm, the insulating area of ​​the insulating patch 3 is reduced, thereby affecting the insulation effect of the cover plate 2 and the safety of the battery cell.

[0047] In addition, if Figure 4 As shown in , the width c of the overlapping area between the insulating patch 3 and each long flange 401 satisfies: c ≥ 1.2 mm. This helps to ensure the connection firmness among the insulating patch 3, the long flange 401 and the cover plate 2, and prevents the connection between the insulating patch 3 and the long flange 401 from warping. In specific implementation, for example, the width c can be 1.2 mm, 1.3 mm, 1.4 mm or 1.45 mm. Here, when the width c of the overlapping area is less than 1.2 mm, the bonding area between the insulating patch 3 and the long flange 401 is small, the risk of the long flange 401 warping is high, and it will affect the bonding firmness at the edge of the insulating patch 3.

[0048] like Figure 4 As shown in , in this embodiment, the spacing d between the side of the insulating patch 3 and the root of the long flange 401 on the same side satisfies: 0.3mm≤d<0.5mm, so that the width of the insulating patch 3 is reduced while the connection effect of the insulating patch 3 is met, thereby reducing the production cost. In specific implementation, the spacing d can be 0.3mm, 0.4mm, 0.45mm or 0.49mm, etc.

[0049] In addition, if Figure 2 and Figure 4As shown in , the battery cell in this embodiment also includes an output pole block 5 arranged on the outside of the cover plate 2, and a through hole 302 is provided on the insulating patch 3 for exposing the output pole block 5, and the through hole 302 is arranged in accordance with the output pole block 5. Among them, the spacing m between the edge of the through hole 302 and the edge of the output pole block 5 satisfies: 0.3mm≤m≤1mm. Here, the through hole 302 is arranged in accordance with the output pole block 5, which is beneficial to reduce the exposure of the cover plate 2 structure. The spacing m satisfies: 0.3mm≤m≤1mm, which is beneficial to avoid the output pole block 5 during the process of the insulating patch 3 being attached to the cover plate 2, thereby improving the convenience of installing the insulating patch 3. In specific implementation, the spacing m can be 0.3mm, 0.5mm, 0.6mm, 0.9mm or 1mm, etc.

[0050] In this embodiment, the insulating patch 3 is provided with a first exposure hole for exposing part of the cover plate 2. This facilitates the temperature collection component to be directly connected to the cover plate 2 exposed at the second exposure hole, so that the temperature information of the battery cell can be collected through the cover plate 2. In addition, an explosion-proof valve is provided on the cover plate 2, and a second exposure hole is provided on the insulating patch 3 for exposing the explosion-proof valve, and the second exposure hole is connected to the first exposure hole. The provision of the second exposure hole here is conducive to the pressure relief of the explosion-proof valve, and is also conducive to the processing and forming of both the first exposure hole and the second exposure hole.

[0051] In addition, the cover plate 2 can be a product in the prior art. The cover plate 2 is provided with a marking portion 201, and the insulating patch 3 is provided with a third exposure hole 301 for exposing the marking portion 201. Figure 3 and Figure 4 As shown in , the identification portion 201 is specifically a "+" or "-" symbol disposed close to the output pole block 5 to identify the polarity of the output pole block 5. The third exposed hole 301 is disposed in the shape of the identification portion 201, which is conducive to improving the identification effect of the battery cell.

[0052] In this embodiment, a liquid injection hole may be provided on the cover plate 2, and a liquid passing hole connected to the liquid injection hole may be provided on the insulating patch 3. Such a setting facilitates the electrolyte to enter the liquid injection hole, thereby facilitating the injection of the electrolyte. It should be noted that, in specific implementation, it may be determined whether the liquid passing hole and the second exposed hole need to be provided on the insulating patch 3 according to the use requirements.

[0053] The battery cell in this embodiment optimizes the position and connection parameters between the insulating patch 3 and the flanged portion, thereby improving the overall bonding reliability and positioning accuracy between the insulating film 4 and the shell 6, and the insulating patch 3 and the cover plate 2, further improving production efficiency, reducing production costs, and avoiding the problem of secondary re-lamination during production caused by warping of the insulating film 4 and the shell 6, and the insulating patch 3 and the cover plate 2 after lamination, thereby improving the safety of the battery cell.

[0054] In addition, the present embodiment also relates to a battery pack, comprising the above battery cell. The battery pack of the present embodiment is provided with the above battery cell, which is beneficial to improving the safety of the battery pack.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery cell, characterized in that: It comprises a shell having an opening at at least one end, a cover plate, an insulating film and an insulating patch arranged on the shell and used to block the opening; The insulating film is wrapped around the outer peripheral wall of the shell and has a flange portion folded to the outside of the edges of the cover plate and bonded to the cover plate, the flange portion includes two long flanges arranged on both sides of the cover plate opposite to each other, and two short flanges respectively arranged at both ends of the cover plate, and an overlapping portion is formed between the same ends of the long flange and the short flange; The insulating patch is arranged on the outside of the two long flanges and is respectively bonded to the long flanges and the cover plate. The two ends of the insulating patch are spaced apart from the short flanges at the same end, so that the overlapping part and part of the cover plate are exposed.

2. The battery cell according to claim 1, characterized in that: The width a of the long flange and / or the short flange satisfies: a≥1.5 mm.

3. The battery cell according to claim 1, characterized in that: The spacing b between the end face of the insulating patch and the short flange at the same end satisfies: 2mm≤b≤50mm.

4. The battery cell according to claim 1, characterized in that: The width c of the overlapping area between the insulating patch and each of the long flanges satisfies: c≥1.2 mm.

5. The battery cell according to claim 1, characterized in that: The distance d between the side edge of the insulating patch and the side edge of the cover plate on the same side satisfies: 0.3mm≤d<0.5mm.

6. The battery cell according to claim 1, characterized in that: It also includes an output pole block disposed on the outer side of the cover plate, the insulating patch is provided with a through hole for exposing the output pole block, and the through hole is arranged in the shape of the output pole block; The distance m between the edge of the through hole and the edge of the output pole block satisfies: 0.3 mm≤m≤1 mm.

7. The battery cell according to claim 1, characterized in that: The insulating patch is provided with a first exposure hole for exposing part of the cover plate.

8. The battery cell according to claim 7, characterized in that: The cover plate is provided with an explosion-proof valve, the insulating patch is provided with a second exposure hole for exposing the explosion-proof valve, and the first exposure hole is connected to the second exposure hole.

9. The battery cell according to any one of claims 1 to 8, characterized in that: The cover plate is provided with a marking portion, and the insulating patch is provided with a third exposure hole for exposing the marking portion; and / or, The cover plate is provided with a liquid injection hole, and the insulating patch is provided with a liquid passage hole connected to the liquid injection hole.

10. A battery pack, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 9.

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