Pole piece, battery, battery pack and electric equipment

Abstract

The utility model discloses a pole piece, battery, battery pack and electric equipment, the pole piece comprises a current collector, the current collector comprises a coating area and a first empty foil area, the first empty foil area is located on one side of the coating area along a first direction, the first empty foil area is provided with a slitting line and a folding part, the folding part comprises a first area and a second area, and the first area is located in the first direction. The second area is connected to the side, in the second direction, of the first area, the slitting line penetrates through the side, away from the second area, of the first area in the second direction, the first area is suitable for being folded along the slitting line, the folded first area exceeds the side, away from the first area, of the second area in the second direction, and the first direction intersects with the second direction. According to the pole piece disclosed by the utility model, the tabs can be fixed on the folding parts according to actual requirements, so that the distance between the tabs can be controlled, and the production yield of batteries is improved.

Description

Technical Field

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

[0002] With the widespread application of Bluetooth headsets, smart watches, wearable electronic devices, electric vehicles, etc., in order to meet the needs of practical applications, the size design of batteries installed on these electronic devices has become more diversified. For some thick and narrow batteries, if the positive and negative pole ears are set in the middle of the pole core, it may cause contact between the two pole ears and cause a battery short circuit. Therefore, the pole ears of this type of battery are usually set on the outside of the pole core. Such a setting can reserve sufficient spacing for the positive and negative pole ears to avoid contact between the two. However, in this solution, since the positive and negative pole ears are welded to the outside of the pole core, the relative position of the positive and negative pole ears is easily affected by the position of the pole piece, thereby reducing the production yield 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, one purpose of the utility model is to provide a pole piece that can provide a movable welding end for a pole ear, thereby controlling the distance from the pole ear to the edge of the pole core, that is, also controlling the spacing between two pole ears.

[0004] Another object of the present invention is to provide a battery.

[0005] Another object of the present invention is to provide a battery pack.

[0006] Another object of the present invention is to provide an electrical device.

[0007] According to the pole piece of the embodiment of the first aspect of the utility model, it includes a current collector, the current collector includes a coating area and a first empty foil area, the surface of the coating area is suitable for coating active materials, the first empty foil area is located on one side of the coating area along the first direction, the first empty foil area is provided with a cutting line and a folding portion, the folding portion includes a first area and a second area, the second area is connected to one side of the first area along the second direction, the cutting line runs through the side of the first area away from the second area along the second direction, the first area is suitable for folding along the cutting line, and the folded first area exceeds the side of the second area along the second direction away from the first area, and the first direction intersects with the second direction.

[0008] According to some embodiments of the present invention, the second area and the folded portion of the first area are stacked, and the stacked second area and the folded first area are connected by bonding or welding.

[0009] According to some embodiments of the present invention, the dimension of the folded first area beyond the second area along the second direction is W1, and 0.3≤W1≤2cm.

[0010] According to some embodiments of the utility model, the first empty foil area also includes a connecting area, which is arranged between the coating area and the folding portion and is spaced apart from the first area of ​​the folding portion. A cutting line is formed between the connecting area and the first area. The size of the connecting area in the first direction is W2, and W2≤2cm.

[0011] According to some embodiments of the present invention, a dimension of the folded portion in the first direction is W3, and 0.3 cm ≤ W3 ≤ 4 cm.

[0012] According to some embodiments of the present invention, the current collector further includes a second empty foil area, and the second empty foil area is arranged on a side of the coating area away from the first empty foil area in the first direction.

[0013] According to some embodiments of the present invention, a size of the second empty foil area in the first direction is W4, where W4≤2 cm.

[0014] According to some embodiments of the present invention, an active material layer is provided on at least one side of the coating area in the thickness direction, and the pole piece further comprises: a first insulating member, which covers a side of the active material layer close to the first empty foil area.

[0015] According to some embodiments of the present invention, the first insulating member includes a first part and a second part connected to each other, the first part covers a side of the active material layer close to the first empty foil area, and the second part covers a side of the first empty foil area close to the active material layer.

[0016] According to some embodiments of the present invention, an active material layer is provided on at least one side of the coating area in the thickness direction, and the pole piece further comprises: a second insulating member, and a side of the active material layer close to the second empty foil area is covered with the second insulating member.

[0017] According to some embodiments of the present invention, at least one side of the first insulating member in the second direction exceeds the first empty foil area, and the first insulating member exceeds the first empty foil area in the second direction by a dimension L1, where L1≤3 mm.

[0018] According to some embodiments of the present invention, a size of a portion of the first insulating member on the active material layer in the first direction is L2, and 0.5 mm≤L2≤5 mm.

[0019] According to the pole piece of a specific embodiment of the utility model, a folding portion is provided on the pole piece, and the pole ear is electrically connected to the folding portion. Such a configuration allows the pole ear to be fixed on the folding portion after the pole core is formed, where the first area exceeds the second area. The pole piece provided by the present invention can control the length of the pole piece in a first direction and at the same time can adjust the lead-out distance of the pole piece in a second direction. When the lead-out end of the pole piece and the pole ear are electrically connected, the distance between the pole ears can be controlled to avoid the risk of short circuit caused by interference between the pole ears.

[0020] According to an embodiment of the second aspect of the utility model, the utility model provides a battery, comprising: a shell, a accommodating cavity is arranged in the shell; a pole core, the pole core is arranged in the accommodating cavity, the pole core comprises a first pole piece and a second pole piece, the first pole piece and / or the second pole piece is the pole piece of the first aspect of the utility model, the part of the first area after folding that exceeds the second area in the second direction is electrically connected to a pole ear, and the electrical properties of the first pole piece and the second pole piece are opposite; a diaphragm, the diaphragm is arranged between the first pole piece and the second pole piece.

[0021] According to some embodiments of the present invention, the first pole piece, the second pole piece and the diaphragm are wound together.

[0022] According to some embodiments of the present invention, the folding portion includes a first folding portion and a second folding portion, the first folding portion is arranged on the first pole piece, and the second folding portion is arranged on the second pole piece.

[0023] According to an embodiment of the third aspect of the utility model, the utility model provides a battery pack, comprising the battery according to the implementation of the second aspect of the utility model.

[0024] According to an embodiment of the fourth aspect of the utility model, the utility model provides an electrical device, comprising the battery according to the embodiment of the second aspect of the utility model or the battery pack according to the embodiment of the third aspect of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] Figure 1 This is a schematic diagram of the structure of a pole piece before cutting according to a specific embodiment of the utility model;

[0027] Figure 2 This is a schematic diagram of the structure of a pole piece before folding according to a specific embodiment of the utility model;

[0028] Figure 3 It is a schematic diagram of the structure after a pole piece is folded according to a specific embodiment of the utility model;

[0029] Figure 4 This is a schematic diagram of the structure of a pole piece before folding according to a specific embodiment of the utility model;

[0030] Figure 5 It is a schematic diagram of the structure after a pole piece is folded according to a specific embodiment of the utility model;

[0031] Figure 6 It is a structural schematic diagram of a pole core according to a specific embodiment of the utility model;

[0032] Figure 7 It is a structural schematic diagram of a pole core according to a specific embodiment of the utility model;

[0033] Figure 8 It is a structural schematic diagram of a pole core according to a specific embodiment of the utility model;

[0034] Reference numerals:

[0035] 1: Pole piece;

[0036] 10: current collector; 11: first empty foil area; 12: second empty foil area; 13: coating area; 14: first insulating member; 15: second insulating member;

[0037] 111: cutting line; 112: folding portion; 113: first area; 114: second area; 115: connecting area;

[0038] 2: Battery;

[0039] 21: pole core; 22: pole ear;

[0040] 210: first pole piece; 211: second pole piece; 212: first adhesive tape; 213: second adhesive tape; 214: third adhesive tape; 215: fourth adhesive tape; 216: first folding portion; 217: second folding portion; 218: diaphragm; 221: first pole ear; 222: second pole ear; 223: first pole ear glue; 224: second pole ear glue. DETAILED DESCRIPTION

[0041] 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.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0043] The pole piece of the embodiment of the utility model is described below with reference to the drawings in the specification.

[0044] As the attached Figure 1-5 As shown, the pole piece 1 according to the embodiment of the utility model includes: a current collector 10, the current collector 10 includes a coating area 13 and a first empty foil area 11, the surface of the coating area 10 is suitable for coating with active materials, the first empty foil area 11 is located on one side of the coating area 13 along the first direction, the first empty foil area 11 is provided with a cutting line 111 and a folding portion 112, the folding portion 112 includes a first area 113 and a second area 114, the second area 114 is connected to one side of the first area 113 along the second direction, the cutting line 111 passes through the side of the first area 113 away from the second area 114 along the second direction, the first area 113 is suitable for folding along the cutting line 111, and the folded first area 113 exceeds the side of the second area 114 away from the first area 113 along the second direction, and the first direction intersects with the second direction. Figure 1 As shown, a folding portion 112 is provided on the first empty foil area 11, and the first area 113 is formed by cutting along the cutting line, and then the foil material at the first area 113 is folded away from the first area 113 in the second direction. This solution can achieve the control of the size of the electrode in the second direction through simple cutting and folding, which is efficient and fast. It should be noted that the first area 113 or the second area 114 of the folding portion can be provided on either side of the second direction, so that folding along either side of the second direction can be achieved, which is not limited in this application.

[0045] In one embodiment, the second area 114 and the folded part of the first area 113 are stacked, and the stacked second area 114 and the folded first area 113 are connected by bonding or welding. By reinforcing the connection between the first area 113 and the second area 114 that are in contact after folding, the first area can be prevented from shifting when it is bent, and the connection strength can be further improved. The connection method includes but is not limited to bonding or welding. In some embodiments, in order to ensure the connection between the second area 114 and the folded first area 113 during the preparation of the electrode, the first area 113 and the second area 114 of the folded part 112 can be glued and fixed, or the second area 114 on the first empty foil area 11 is affixed with double-sided tape or hot melt adhesive to fix the second area 114 on the first empty foil area 11 and the folded first area 113, or, after the first area 113 is folded, the surface part of the folded first area 113 and the second area 114 is fixed by welding. The specific implementation method is not limited here.

[0046] In one embodiment, the dimension of the folded first area 113 that exceeds the second area 114 along the second direction is W1. In the embodiment of the present application, in order to reasonably control the size of the electrode lead-out to weld the electrode ear and avoid the electrode from breaking during the winding process, 0.3cm≤W1≤2cm.

[0047] In one embodiment, the first empty foil area 11 also includes a connection area 115, which is arranged between the coating area 13 and the folded portion 112. The size of the connection area 115 in the first direction is W2, W2≤2cm. Such a setting can avoid damage to the active material layer when cutting the electrode sheet and will not cause excess waste of foil.

[0048] Furthermore, the dimension of the folded portion 112 in the first direction is W3, 0.3cm≤W3≤4cm. When W3 is within this dimension range, the connection and fixation between the folded portion 112 and the pole ear can be achieved, while also avoiding excessive dimension and contact with the pole piece, which may cause a short circuit in the battery.

[0049] In one embodiment, the current collector 10 also includes a second empty foil area 12, which is arranged on a side of the coating area 13 away from the first empty foil area 11 in the first direction. The second empty foil area 12 has a size W4 in the first direction, W4≤2cm. Such an arrangement can avoid damage to the active material layer when cutting the electrode sheet and will not waste too much foil.

[0050] According to the embodiments of the present utility model, Figure 4-5 As shown, the pole piece 1 further includes a first insulating member 14, and the coating area 13 and the edge of the first empty foil area 11 and / or the edge of the second empty foil area 12 are insulated and connected by the first connecting member 14. The function of the first insulating member 14 is to strengthen the connection strength between the coating area 13 and the edge of the first empty foil area 11. In one embodiment of the present application, Figure 4-5 As shown, the first insulating member 14 may be an insulating tape to prevent burrs on the edge of the active material layer and burrs when the pole piece is wound from piercing the diaphragm and causing a short circuit.

[0051] According to an embodiment of the utility model, at least one side of the first insulating member 14 in the second direction exceeds the first empty foil area 11, and the first insulating member 14 exceeds the first empty foil area 11 in the second direction by a dimension L1, where L1≤3mm. Figure 4-5 As shown, such a configuration allows the first insulating member 14 to cover the edge of the coating area 13, preventing the burrs on the edge of the active material layer from piercing the diaphragm 218 and causing a short circuit in the battery, while also reducing the space occupied by the pole core and avoiding affecting the packaging.

[0052] According to an embodiment of the present invention, at least part of the first insulating member 14 is stacked with the coating area 13, and the size of the overlapping part of the first insulating member 14 and the coating area 13 in the first direction is L2, 0.5mm≤L2≤5mm. Figure 4-5 As shown, such a configuration can prevent the burrs on the edge of the active material layer from piercing the diaphragm 218 and reduce the loss of the active material layer on the coating area 13 .

[0053] According to an embodiment of the utility model, the pole piece further includes: a second insulating member 15, and the side of the active material layer close to the second empty foil area 12 is covered with the second insulating member 15. The function of the second insulating member 15 is to strengthen the connection strength of the edge of the coating area 13 and the second empty foil area 12. The second insulating member 15 can be an insulating tape to prevent the burrs on the edge of the active material layer and the burrs when the pole piece is wound from piercing the diaphragm and causing a short circuit.

[0054] According to the embodiment of the second aspect of the present utility model, Figure 6-8 As shown, the utility model provides a battery 2, comprising: a shell, a housing cavity is provided in the shell; a pole core 21, the pole core 21 is provided in the housing cavity, the pole core 21 comprises a first pole piece 210 and a second pole piece 211, the first pole piece 210 and / or the second pole piece 211 are the pole pieces provided by the first aspect of the present invention, the first pole piece 210 and the second pole piece 211 have opposite electrical properties, the first pole piece 210 may be a positive pole, the second pole piece 211 may be a negative pole, or the first pole piece 210 may be a negative pole, and the second pole piece 211 may be a positive pole; a diaphragm 218, the diaphragm 218 is provided between the first pole piece 210 and the second pole piece 211. A pole ear 22, the pole ear 22 is provided in the housing cavity and is suitable for being electrically connected to the folding portion 112. By providing the folding portion 112 at the end of the pole piece and electrically connecting the pole ear 22 to the folding portion 112, such a configuration can fix the pole ear 22 on the folding portion 112 after the pole core 21 is formed. In the width direction of the pole core 21, the pole ear 22 can be fixed on the folded portion 112 according to actual needs, so that the distance from the pole ear 22 to the edge of the pole core 21 can be controlled, that is, the spacing between the two pole ears 22 can also be controlled, thereby improving the production yield of the battery. At the same time, the width of the pole ear 22 after folding can be controlled, and the risk of short circuit caused by the pole ear overlapping due to the folded pole ear being too large can be avoided.

[0055] Furthermore, the first pole piece 210, the second pole piece 211 and the diaphragm 218 are wound to form a wound pole core, and the folded portion 112 includes a first folded portion 216 and a second folded portion 217, the first folded portion 216 is arranged on the first pole piece 210, and the second folded portion 217 is arranged on the second pole piece 211. Figure 6-8As shown, the battery further includes a first pole lug 221 and a second pole lug 222, the first pole lug 221 is electrically connected to the first folding portion 216, and the second pole lug 222 is electrically connected to the second folding portion 217. Specifically, the first pole lug 221 can be fixed to the first folding portion 216 by welding or bonding to electrically lead out the first pole piece 210, and the second pole lug 222 can be fixed to the second folding portion 217 by welding or bonding to electrically lead out the second pole piece 211. It should be noted that after the first pole lug 221 is fixedly connected to the first folding portion 216, and the second pole lug 222 is fixedly connected to the second folding portion 217, it can be considered that the distance between the first pole lug 221 and the second pole lug 222 and the edge of the pole core 21 is fixed. At this time, the excess foil on the first folding portion 216 and the second folding portion 217 can be cut to reduce the impact of the subsequent first folding portion 216 and the second folding portion 217 on the battery assembly. At the same time, a first insulating member 14 needs to be provided at the edge of the coating area 13. In this solution, the first insulating member 14 uses an insulating tape to prevent the burrs at the edge of the coating area from piercing the diaphragm 218 and causing a short circuit in the battery. Figure 6 As shown, the first tape 212 and the second tape 213 are arranged at the end edge of the coating area of ​​the second pole piece 211, and the first tape 212 and the second tape 213 are arranged on both sides of the second pole piece 211 respectively; the third tape 214 and the fourth tape 215 are arranged at the edge of the front coating area 13 of the second pole piece 211, and the third tape 214 and the fourth tape 215 are arranged on both sides of the second pole piece 211 respectively. It should be noted that the first tape 212, the second tape 213, the third tape 214 and the fourth tape 215 are all the aforementioned insulating tapes. The insulating tape is arranged at the edge of the coating area 13 to prevent the burrs at the edge of the coating area 13 from piercing the diaphragm 218 and causing a short circuit in the battery.

[0056] According to the embodiments of the present utility model, in some implementations, as Figure 7 As shown, the first pole ear 221 and the second pole ear 222 are also provided with the first pole ear glue 223 and the second pole ear glue 224. In the width direction of the pole core, the edge of the first pole ear glue 223 does not exceed the edge of the pole piece in the width direction of the pole core after winding, and the edge of the second pole ear glue 224 does not exceed the edge of the pole piece in the width direction of the pole core after winding. Such a setting can avoid increasing the size of the pole core 21 and facilitate the subsequent assembly of the battery.

[0057] According to the embodiments of the present utility model, in some implementations, as Figure 8 As shown, Figure 6The difference is that the first folding portion 216 and the second folding portion 217 of the pole core 21 are on the same side of the pole core 21, the first pole ear 221 is fixedly connected to the first folding portion 216, and the second pole ear 222 is fixedly connected to the second folding portion 217. A gap needs to be reserved between the first folding portion 216 and the second folding portion 217 to avoid contact between the two and cause a short circuit in the battery. It should be noted that a first tape 212 is provided at the tail end of the coating area on the second pole piece 211 to prevent the burrs at the tail end of the coating area from piercing the diaphragm 218 and causing a short circuit in the battery. A second tape 213 also needs to be provided at the second pole piece 211 corresponding to the first folding portion 216. Burrs are usually generated when cutting the first folding portion 216. This arrangement can prevent the burrs generated when cutting the first folding portion 216 from piercing the diaphragm 218 and causing a short circuit in the battery.

[0058] According to an embodiment of the third aspect of the utility model, the utility model provides a battery pack, comprising a battery implemented according to the second aspect of the utility model.

[0059] According to an embodiment of the fourth aspect of the utility model, the utility model provides an electrical device, including a battery according to an embodiment of the second aspect of the utility model or a battery pack according to an embodiment of the third aspect of the utility model.

[0060] In the description of this specification, 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 expressions of the above terms do not necessarily refer to the same embodiment or example.

[0061] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A pole piece, characterized in that: include: A current collector, the current collector comprising a coating area and a first empty foil area, the surface of the coating area being suitable for coating an active material, the first empty foil area being located on one side of the coating area along a first direction, the first empty foil area being provided with a slitting line and a folding portion, the folding portion comprising a first area and a second area, the second area being connected to one side of the first area along a second direction, the slitting line passing through a side of the first area away from the second area along the second direction, the first area being suitable for folding along the slitting line, and the folded first area exceeds a side of the second area away from the first area along the second direction, and the first direction intersects with the second direction.

2. The pole piece according to claim 1, characterized in that: The second area and the folded portion of the first area are stacked, and the stacked second area and the folded first area are connected by bonding or welding.

3. The pole piece according to claim 1, characterized in that: The dimension of the folded first area extending beyond the second area along the second direction is W1, and 0.3 cm≤W1≤2 cm.

4. The pole piece according to claim 1, characterized in that: The first empty foil area also includes a connecting area, which is arranged between the coating area and the folding portion and is spaced apart from the first area of ​​the folding portion. The cutting line is formed between the connecting area and the first area. The size of the connecting area in the first direction is W2, and W2≤2cm.

5. The pole piece according to claim 1, characterized in that: The dimension of the folded portion in the first direction is W3, 0.3 cm≤W3≤4 cm.

6. The pole piece according to claim 1, characterized in that: An active material layer is provided on at least one side of the coating area in the thickness direction. The pole piece further comprises: a first insulating member, which covers a side of the active material layer close to the first empty foil area.

7. The pole piece according to claim 6, characterized in that: The first insulating member includes a first portion and a second portion connected to each other, the first portion covers a side of the active material layer close to the first empty foil area, and the second portion covers a side of the first empty foil area close to the active material layer.

8. The pole piece according to claim 1, characterized in that: The current collector further includes a second empty foil region, which is disposed on a side of the coating region away from the first empty foil region in the first direction.

9. The pole piece according to claim 8, characterized in that: The size of the second empty foil area in the first direction is W4, where W4≤2 cm.

10. The pole piece according to claim 8, characterized in that: An active material layer is provided on at least one side of the coating area in the thickness direction. The pole piece further comprises: a second insulating member. A side of the active material layer close to the second hollow foil area is covered with the second insulating member.

11. The pole piece according to claim 6, characterized in that: At least one side of the first insulating member in the second direction exceeds the first empty foil area, and the first insulating member exceeds the first empty foil area in the second direction by a dimension L1, where L1≤3 mm.

12. The pole piece according to claim 7, characterized in that: A portion of the first insulating member on the active material layer has a size L2 in the first direction, and 0.5 mm≤L2≤5 mm.

13. A battery, characterized in that: include: A housing is provided with a receiving cavity; A pole core, wherein the pole core is arranged in the accommodating cavity, and the pole core includes a first pole piece and a second pole piece, the first pole piece and / or the second pole piece is the pole piece according to any one of claims 1 to 12, and the part of the first area after folding that exceeds the second area in the second direction is electrically connected to a pole ear, and the electrical properties of the first pole piece and the second pole piece are opposite; a diaphragm, wherein the diaphragm is arranged between the first pole piece and the second pole piece.

14. The battery according to claim 13, characterized in that The first pole piece, the second pole piece and the diaphragm are wound together.

15. The battery according to claim 13, characterized in that The folding portion includes a first folding portion and a second folding portion, wherein the first folding portion is disposed on the first pole piece, and the second folding portion is disposed on the second pole piece.

16. A battery pack, characterized in that: It comprises a pole piece according to any one of claims 1 to 12 or a battery according to any one of claims 13 to 15.

17. An electrical equipment, characterized in that: Comprising the battery according to any one of claims 13 to 15 or the battery pack according to claim 16.

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