Battery and electronic equipment

Abstract

The utility model discloses a battery which comprises a battery cell, the battery cell comprises a first surface, two second surfaces and two third surfaces, the two second surfaces are oppositely arranged, the two third surfaces are oppositely arranged, the two second surfaces and the two third surfaces jointly surround the first surface and are connected with the first surface, and the area of the first surface and the area of the second surfaces are smaller than the area of the third surfaces; the battery cell is provided with a foil tab, and the foil tab protrudes out of the first surface; the metal strap tab and the foil tab are welded to form a welding mark; the two ends of the first adhesive layer extend to the two second faces in the length direction of the first face, and the first adhesive layer is attached to the welding marks and the first face. The battery provided by the utility model can have better safety.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery and electronic equipment. Background Art

[0002] In the related art, after the battery cell is placed in the shell, the foil tab of the battery cell needs to be welded to the external metal strip tab to achieve conduction between the battery cell and the outside world. After the tab of the battery cell and the metal strip tab are welded, burrs will appear at the weld mark, and the welding burrs may pierce the shell, resulting in low safety performance of the battery. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a battery with higher safety.

[0004] The utility model also provides an electronic device.

[0005] A battery according to a first embodiment of the present invention includes:

[0006] A battery cell, comprising a first surface, two second surfaces and two third surfaces, wherein the two second surfaces are arranged opposite to each other, the two third surfaces are arranged opposite to each other, the two second surfaces and the two third surfaces surround the first surface together and are connected to the first surface, and the area of ​​the first surface and the area of ​​the second surface are both smaller than the area of ​​the third surface; the battery cell has a foil tab, and the foil tab protrudes from the first surface;

[0007] A metal strip pole ear, wherein the metal strip pole ear and the foil pole ear are welded to form a weld mark;

[0008] A first adhesive layer, both ends of which extend to the two second surfaces along the length direction of the first surface respectively, and the first adhesive layer is attached to the weld mark and the first surface.

[0009] The battery according to the embodiment of the utility model has at least the following beneficial effects: after the first adhesive layer is attached to the weld mark, the first adhesive layer can effectively cover the weld mark, thereby effectively preventing the burrs of the weld mark from piercing the shell. In this way, the battery is safer.

[0010] According to some embodiments of the battery of the present invention, the metal strip tab includes a main body and a protruding portion, the foil tab is welded to the main body, the weld mark is located on a side of the main body away from the first surface, and the protruding portion is connected to the main body and protrudes relative to the first surface.

[0011] In batteries according to some embodiments of the present invention, a length of a portion of the first adhesive layer bonded to the second surface is L1, and 10 um ≤ L1.

[0012] According to some embodiments of the battery of the present invention, the battery further includes a second adhesive layer, and the second adhesive layer is arranged between the metal strip tab and the battery core.

[0013] According to the battery of some embodiments of the present invention, along the length direction of the battery core, the projections of the metal strip tabs all fall on the projection of the second adhesive layer.

[0014] In the battery of some embodiments of the present invention, the first adhesive layer is attached to the second adhesive layer.

[0015] In batteries according to some embodiments of the present invention, the width of the first adhesive layer is smaller than the width of the first surface.

[0016] In the battery according to some embodiments of the present invention, the thickness of the first adhesive layer is L2, 10um≤L2≤100um.

[0017] In the battery according to some embodiments of the present invention, the width of the first adhesive layer is greater than the width of the weld mark.

[0018] The electronic device according to the second aspect of the present invention comprises the battery described in any one of the first aspect.

[0019] The electronic device according to the embodiment of the utility model has at least the following beneficial effects: after the first adhesive layer is attached to the weld mark, the first adhesive layer can effectively cover the weld mark, thereby effectively preventing the burrs of the weld mark from piercing the shell. In this way, the safety of the battery is better. Furthermore, the safety of the electronic device having the battery is also better.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0022] Figure 1 A schematic diagram of a battery according to a first embodiment of the present invention;

[0023] Figure 2 A schematic diagram of a battery according to a second embodiment of the present invention;

[0024] Figure 3 is a schematic diagram of a battery according to a third embodiment of the present utility model;

[0025] Figure 4 Schematic cross-sectional views of batteries according to some embodiments of the present invention.

[0026] Reference numerals:

[0027] The battery 10 , the battery cell 100 , the first surface 110 , the second surface 120 , the third surface 130 , the foil tab 140 , the metal strip tab 200 , the body 210 , the protruding portion 220 , the weld mark 300 , the first adhesive layer 400 , and the second adhesive layer 500 . DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 a limitation on the present invention.

[0030] In the description of the present utility model, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0031] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0032] In the description of the utility model, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0033] Please refer to Figures 1 to 4 In some embodiments, the battery 10 includes: a battery cell 100, a metal strip tab 200 and a first adhesive layer 400. The battery cell 100 includes a first surface 110, two oppositely disposed second surfaces 120 and two oppositely disposed third surfaces 130, and the area of ​​the first surface 110 and the area of ​​the second surface 120 are both smaller than the area of ​​the third surface 130. Among them, the shape of the battery cell 100 can be a rectangle, and the area of ​​the third surface 130 can be the largest surface in the battery cell 100. The battery cell 100 can be made by a winding process or a lamination process. The battery cell 100 has a foil tab 140, and the foil tab 140 protrudes from the first surface 110. Among them, the foil tab 140 can be provided in plurality, for example, three, four or ten. The arrangement of multiple foil tabs 140 can speed up the charging speed of the battery cell 100. The foil tab 140 is mainly formed by cutting the pole piece. After the pole piece cuts out the foil tab 140, the pole piece is stacked or wound to form the battery cell 100. The metal strip tab 200 is welded to the foil tab 140, and the welding of the metal strip tab 200 and the foil tab 140 forms a weld mark 300. That is, the metal strip tab 200 is connected to the foil tab 140 by welding, so that the metal strip tab 200 can realize the conduction of the battery cell 100 with the outside world. Multiple foil tabs 140 can be welded on the metal strip tab 200, wherein after the metal strip tab 200 and the foil tab 140 are welded, a weld mark 300 will be formed at the welding position, and there are burrs on the weld mark 300, so the first adhesive layer 400 is required to cover the burrs, thereby effectively preventing the burrs from piercing the aluminum-plastic film of the battery 10. The two ends of the first adhesive layer 400 extend to the two second surfaces 120 along the length direction of the first surface 110, and the first adhesive layer 400 is attached to the weld mark 300 and the first surface 110. The first adhesive layer 400 can be made of a material with good viscosity, such as sis (styrene-isoprene-styrene) material. Among them, the good viscosity enables the first adhesive layer 400 to be bonded to the weld mark 300 and the first surface 110, so that the first adhesive layer 400 can cover the welding burrs, effectively avoiding the risk of the welding burrs piercing the aluminum-plastic film. Specifically, there are burrs on the weld mark 300, and the first adhesive layer 400 can cover the burrs, thereby effectively preventing the burrs from piercing the aluminum-plastic film of the battery 10. In this way, the safety of the battery 10 is better.

[0034] Further, in order to improve the stability of the first adhesive layer 400 being bonded to the first surface 110, the length of the first adhesive layer 400 can be made greater than the length of the first surface 110, so that the first adhesive layer 400 extends to the second surface 120 connected to the first surface 110. Specifically, after the first adhesive layer 400 extends to the second surface 120, the first adhesive layer 400 has a larger bonding area with the first surface 110 and the second surface 120, so that the first adhesive layer 400 can be firmly bonded to the battery cell 100. It can be imagined that the more firmly the first adhesive layer 400 is bonded, the longer the first adhesive layer 400 lasts to cover the welding burrs, which can make the reliability of the battery 10 higher. Further, there are two ways to bond the first adhesive layer 400 to the first surface 110 and the second surface 120. One is to first bond the first adhesive layer 400 to the first surface 110, and then bond the two ends of the first adhesive layer 400 to the two second surfaces 120 respectively. Another method is to first bond the first end of the first adhesive layer 400 to the second surface 120 , then bond the middle portion of the first adhesive layer 400 to the first surface 110 , and finally bond the second end of the first adhesive layer 400 to another second surface 120 .

[0035] It should be added that, in the prior art, the first adhesive layer 400 extends along the width direction of the first surface 110, so that when the first adhesive layer 400 is attached to the weld mark 300, it is necessary to punch holes in the first adhesive layer 400 to avoid the metal strip tab 200. In the present application, the first adhesive layer 400 extends along the length direction of the first surface 110, and the first adhesive layer 400 is attached to the weld mark 300 and the first surface 110. This can effectively avoid punching holes in the first adhesive layer 400, thereby saving the cost of punching holes and further saving the cost of manufacturing the battery 10. In this way, the battery 10 can also have lower cost and higher working efficiency.

[0036] It is necessary to add that, when the adhesive tape in the prior art (corresponding to the first adhesive layer 400 in the present application) is attached to the weld mark 300, in addition to punching holes, it is also necessary to calculate the distance between the two metal strip tabs 200, so this will also increase the extra cost. After the adhesive tape in the prior art is attached to the weld mark 300, the two ends of the adhesive tape will extend to the two third surfaces 130 respectively, which will indirectly increase the thickness of the battery cell 100, resulting in a lower energy density of the battery 10. The energy density of the battery 10 in the present application is higher, because on the one hand, the first adhesive layer 400 does not need to extend to the second surface 120, and on the other hand, even if the first adhesive layer 400 extends to the second surface 120, then for the rectangular battery cell 100, the volume increased by the first adhesive layer 400 attached to the second surface 120 will be less than the volume increased by the adhesive tape attached to the third surface 130.

[0037] For further information, please refer to Figure 4The specific structure of the battery 10 is introduced below. In some embodiments, the metal strip tab 200 includes a main body 210 and a protruding portion 220. The foil tab 140 is welded to the main body 210. The weld mark 300 is located on the side of the main body 210 away from the first surface 120. The protruding portion 220 is connected to the main body 210 and protrudes relative to the first surface 110.

[0038] Further, when the first adhesive layer 400 extends onto the second surface 120, the length of the first adhesive layer 400 bonded to the second surface 120 can be limited. Specifically, in some embodiments, the length of the portion of the first adhesive layer 400 bonded to the second surface 120 is L1, 10um≤L1. Wherein, L1 can be 10um, 11um, 12um or 15um, etc. When 10um≤L1, the first adhesive layer 400 can be firmly bonded to the battery cell 100, so that the bonding performance of the first adhesive layer 400 is good. Wherein, the length of the portion of the first adhesive layer 400 bonded to the second surface 120 can specifically be that the length of the portion of the first end bonded to one second surface 120 is greater than 10um, and the length of the portion of the second end bonded to another second surface 120 is greater than 10um.

[0039] Although it is mentioned above that L1 can be 10um, 11um, 12um or 15um, etc., L1 can also be 20um, 30um, etc., which can be determined according to the actual situation and will not be elaborated here.

[0040] Furthermore, the main function of the first adhesive layer 400 is to cover welding burrs, wherein the first adhesive layer 400 has another function. After the foil pole ear 140 and the metal strip pole ear 200 are welded, the foil pole ear 140 and the metal strip pole ear 200 are generally bent, which can effectively reduce the length of the battery 10 and effectively avoid the battery 10 having a smaller energy density at a larger length. Therefore, after the foil pole ear 140 and the metal strip pole ear 200 are bent, the first adhesive layer 400 can also play a role in fixing the foil pole ear 140 and the metal strip pole ear 200. Specifically, in addition to the first adhesive layer 400, a second adhesive layer 500 is also required. The second adhesive layer 500 is used to prevent the metal strip pole ear 200 from contacting the battery cell 100. For details, please refer to Figure 4In some embodiments, the battery 10 further includes a second adhesive layer 500, and the second adhesive layer 500 is disposed between the metal strip tab 200 and the battery cell 100. Specifically, after the second adhesive layer 500 can be disposed between the metal strip tab 200 and the first surface 110 of the battery cell 100, the second adhesive layer 500 can effectively prevent the metal strip tab 200 from abutting against the first surface 110, thereby causing a short circuit. Among them, the second adhesive layer 500 can be pasted in such a way that the second adhesive layer 500 extends along the length direction of the first surface 110, the shape of the first surface 110 is a rectangle, the second adhesive layer 500 is pasted on the first surface 110, and then the foil tab 140 and the metal strip tab 200 are bent. It should be noted that the content of bending the foil tab 140 and the metal strip tab 200 belongs to the prior art and will not be repeated here.

[0041] Further, when the battery 10 has the first adhesive layer 400 and the second adhesive layer 500, the order of bonding may be to first bond the second adhesive layer 500 to the first surface 110, then bend the welded foil tab 140 and the metal strip tab 200, and then bond the first adhesive layer 400 to the first surface 110 and the weld mark 300. In other embodiments, the second adhesive layer 500 may not be required, and only the first adhesive layer 400 needs to be bonded to the weld mark 300 and the first surface 110. The first adhesive layer 400 may be in the shape of an "I" character, and the second adhesive layer 500 may also be in the shape of an "I" character.

[0042] For further information, please refer to Figure 4 In some embodiments, along the length direction of the battery cell 100, the projection of the metal strip tab 200 all falls on the projection of the second adhesive layer 500. After the projection of the metal strip tab 200 all falls on the projection of the second adhesive layer 500, it can effectively ensure that the metal strip tab 200 does not directly abut on the first surface 110. That is, the width of the metal strip tab 200 is smaller than the width of the second adhesive layer 500. In addition, if the width of the second adhesive layer 500 is larger than the width of the metal strip tab 200, the cost of the second adhesive layer 500 will be too high. Therefore, in some embodiments, in order to save costs, the width of the second adhesive layer 500 can be equal to the width of the metal strip tab 200. That is, along the length direction of the battery cell 100, the projection of the metal strip tab 200 and the projection of the second adhesive layer 500 all overlap.

[0043] Further, there are two ways for the first adhesive layer 400 to be attached to the weld mark 300 and the first surface 110. The first way is that the first adhesive layer 400 directly contacts the weld mark 300 and the first surface 110, and there is no other object between the first adhesive layer 400, the weld mark 300 and the first surface 110; the second way is that the first adhesive layer 400 indirectly contacts the weld and the first surface 110, that is, the first adhesive layer 400 covers the second adhesive layer 500, and the second adhesive layer 500 covers the first surface 110. The second way is described below. Specifically, in some embodiments, the first adhesive layer 400 is attached to the second adhesive layer 500. Among them, when the first adhesive layer 400 is attached to the first surface 110, a thin film is usually provided on the battery 100, that is, the first adhesive layer 400 is attached to the thin film of the first surface 110. The first adhesive layer 400 has a poor bonding effect on the film. Therefore, in order to improve the bonding effect of the first adhesive layer 400, the first adhesive layer 400 can be attached to the second adhesive layer 500 (the hardness of the second adhesive layer 500 is greater than that of the film).

[0044] Further, in some embodiments, the width of the first adhesive layer 400 is smaller than the width of the first surface 110. Specifically, if the width of the first adhesive layer 400 is larger than the width of the first surface 110, after the first adhesive layer 400 exceeds the first surface 110, the width of the first adhesive layer 400 may become the final thickness of the battery cell 100, which will result in a lower energy density of the battery cell 100. Therefore, the width of the first adhesive layer 400 cannot be larger than the width of the first surface 110. In addition, if the width of the first adhesive layer 400 is equal to the width of the first surface 110, then the size requirements will be more stringent, which will further require higher processing accuracy and lead to extra processing costs. Therefore, it is a better embodiment that the width of the first adhesive layer 400 is smaller than the width of the first surface 110. Further, the difference between the width of the first adhesive layer 400 and the width of the first surface 110 can be 0.5mm to 2mm.

[0045] Further, the thickness of the first adhesive layer 400 is introduced below. In some embodiments, the thickness of the first adhesive layer 400 is L2, 10um≤L2≤100um. Specifically, when the thickness of the first adhesive layer 400 is less than 10um, if the thickness of the first adhesive layer 400 is small, then the effect of the first adhesive layer 400 covering the welding burrs will be poor. Therefore, the thickness of the first adhesive layer 400 cannot be less than 10um. When the thickness of the first adhesive layer 400 is greater than 100um, if the thickness of the first adhesive layer 400 is large, then although the effect of the first adhesive layer 400 covering the welding burrs is better, the first adhesive layer 400 is too thick, which will cause the first adhesive layer 400 to occupy too much space, thereby ultimately making the energy density of the battery 10 low. Therefore, the thickness of the first adhesive layer 400 cannot be greater than 100um. It is further conceivable that the thickness of the first adhesive layer 400 can be 10um, 20um, 40um, 60um, 80um, or 100um.

[0046] Although it is mentioned above that the thickness of the first adhesive layer 400 can be 10um, 20um, 40um, 60um, 80um, or 100um, etc., the thickness of the first adhesive layer 400 is not limited thereto. The thickness of the first adhesive layer 400 can also be 12um, 25um, 30um, 50um, 85um, or 95um, etc., which can be determined according to actual conditions and will not be described in detail here.

[0047] Specifically, in order to achieve the effect that the first adhesive layer 400 covers the weld mark 300, there may be two settings. The first method is to make the width of the first adhesive layer 400 equal to the width of the weld mark 300. In this method, when the first adhesive layer 400 is attached to the weld mark 300, the attachment accuracy is high. Otherwise, after the first adhesive layer 400 is attached crookedly, the weld mark 300 may still leak out. The second method is to make the width of the first adhesive layer 400 greater than the width of the weld mark 300. In this method, compared with the first method, the second method has a higher fault tolerance rate. When the first adhesive layer 400 is attached to the weld mark 300, the first adhesive layer 400 can be attached with a lower accuracy. Therefore, in some embodiments, the width of the first adhesive layer 400 is greater than the width of the weld mark 300. The difference between the width of the first adhesive layer 400 and the width of the weld mark 300 can be 0.5mm to 2mm.

[0048] In some embodiments, the electronic device includes the battery 10 of any one of the above embodiments. After the first adhesive layer 400 is attached to the weld mark 300, the first adhesive layer 400 can effectively cover the weld mark 300, thereby effectively preventing the burrs of the weld mark 300 from piercing the shell. In this way, the safety of the battery 10 is better. Furthermore, the safety of the electronic device having the battery 10 is also better.

[0049] The embodiments of the utility model are described in detail above in conjunction with the accompanying drawings, but the utility model is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the utility model. In addition, the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

Claims

1. A battery, characterized in that include: A battery cell, comprising a first surface, two second surfaces and two third surfaces, wherein the two second surfaces are arranged opposite to each other, the two third surfaces are arranged opposite to each other, the two second surfaces and the two third surfaces surround the first surface together and are connected to the first surface, and the area of ​​the first surface and the area of ​​the second surface are both smaller than the area of ​​the third surface; the battery cell has a foil tab, and the foil tab protrudes from the first surface; A metal strip pole ear, wherein the metal strip pole ear and the foil pole ear are welded to form a weld mark; A first adhesive layer, both ends of which extend to the two second surfaces along the length direction of the first surface respectively, and the first adhesive layer is attached to the weld mark and the first surface.

2. The battery according to claim 1, characterized in that The metal strip tab comprises a main body and a protruding portion, the foil tab is welded to the main body, the weld mark is located on a side of the main body away from the first surface, and the protruding portion is connected to the main body and protrudes relative to the first surface.

3. The battery according to claim 1, characterized in that The length of the portion of the first adhesive layer bonded to the second surface is L1, 10um≤L1.

4. The battery according to claim 1, characterized in that The battery further includes a second adhesive layer, which is arranged between the metal strip tab and the battery core.

5. The battery according to claim 4, characterized in that Along the length direction of the battery core, the projections of the metal strip tabs all fall on the projection of the second adhesive layer.

6. The battery according to claim 4, characterized in that The first adhesive layer is attached to the second adhesive layer.

7. The battery according to claim 1, characterized in that The width of the first adhesive layer is smaller than the width of the first surface.

8. The battery according to claim 1, characterized in that The thickness of the first adhesive layer is L2, 10um≤L2≤100um.

9. The battery according to claim 1, characterized in that The width of the first adhesive layer is greater than the width of the weld mark.

10. An electronic device, characterized in that Comprising the battery as claimed in any one of claims 1 to 9.

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