Battery cell, battery and electronic equipment

Abstract

The utility model discloses a battery cell, a battery and electronic equipment, and the battery cell comprises a first pole piece provided with a first empty foil area; the first tab is welded to the first empty foil area, the first tab comprises a first end and a second end which are opposite to each other, and the first end protrudes relative to the first pole piece in the width direction of the first pole piece; the first adhesive layer comprises a first part and a second part, the first part is connected to the second part, the two sides of the first part are connected to the second end and the first empty foil area respectively, and the second part protrudes relative to the first tab. The battery cell provided by the utility model can effectively prevent tab burrs from puncturing the foil.

Description

Technical Field

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

[0002] In the related art, during the manufacturing process of a battery, after the pole piece is manufactured, the pole ear needs to be welded to the pole piece. Specifically, an empty foil area is provided on the pole piece. After the pole ear is cut, the pole ear is welded to the empty foil area, thereby completing the welding of the pole ear to the pole piece.

[0003] Furthermore, burrs will be generated during the cutting process of the pole ear. Among them, after the pole ear is welded to the pole piece, when the battery cell is charged and discharged, the battery cell will expand. When the battery cell expands, the pole ear will be squeezed, resulting in the burrs at the end of the pole ear piercing the foil of the pole piece, which may cause the battery cell to malfunction. Summary of the Utility Model

[0004] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides a battery cell that can effectively prevent the burrs of the pole ear from piercing the foil.

[0005] The utility model also provides a battery.

[0006] The utility model also provides an electronic device.

[0007] The battery cell according to the first aspect embodiment of the utility model includes:

[0008] A first pole piece provided with a first empty foil area;

[0009] A first pole ear welded to the first empty foil area. The first pole ear includes opposite first and second ends, and the first end protrudes relative to the first pole piece along the width direction of the first pole piece;

[0010] A first glue layer including a first part and a second part. The first part is connected to the second part, and both sides of the first part are respectively connected to the second end and the first empty foil area, and the second part protrudes relative to the first pole ear.

[0011] The battery cell according to the embodiment of the utility model has at least the following beneficial effects: After both sides of the first part of the first glue layer are respectively connected to the second end and the first empty foil area, and the second part protrudes relative to the first pole ear, the first glue layer can effectively prevent the burrs on the first pole ear from piercing into the first empty foil area and thus piercing the first pole piece. Specifically, the battery cell can effectively prevent the burrs of the pole ear from piercing the foil.

[0012] For the battery cell according to some embodiments of the present utility model, the second end and the first empty foil area jointly define a receiving groove, and the first part is disposed in the receiving groove.

[0013] For the battery cell according to some embodiments of the present utility model, in the direction from the first end to the second end, the distance between the second end and the first empty foil area gradually increases, and the thickness of the first part gradually increases.

[0014] For the battery cell according to some embodiments of the present utility model, the battery cell further includes a first tab glue and a second tab glue. The first tab glue covers one side of the first empty foil area, one side of the first tab, and one side of the first glue layer. The second tab glue covers the other side of the first empty foil area, the other side of the first tab, and the other side of the first glue layer.

[0015] For the battery cell according to some embodiments of the present utility model, the first electrode tab includes the first empty foil area and two first coating areas, and the two first coating areas are respectively connected to both ends of the first empty foil area.

[0016] For the battery cell according to some embodiments of the present utility model, the thickness of the first glue layer is L1, and 10um ≤ L1 ≤ 20um.

[0017] For the battery cell according to some embodiments of the present utility model, the battery cell further includes a second electrode tab, a second tab, and a second glue layer; the second electrode tab is provided with a second empty foil area; the second tab is welded to the second empty foil area, the second tab includes an opposite third end and a fourth end, and the third end protrudes relative to the second electrode tab in the width direction of the second electrode tab; the second glue layer includes a third part and a fourth part, the third part is connected to the fourth part, both sides of the third part are respectively connected to the fourth end and the second empty foil area, and the fourth part protrudes relative to the second tab.

[0018] For the battery cell according to some embodiments of the present utility model, the thickness of the second glue layer is L2, and 10um ≤ L2 ≤ 20um.

[0019] For the battery according to the second aspect embodiments of the present utility model, it includes the battery cell according to any one of the first aspect embodiments.

[0020] For the battery according to the embodiments of the present utility model, it has at least the following beneficial effects: After the first part on both sides of the first glue layer is respectively connected to the second end and the first empty foil area, and the second part protrudes relative to the first tab, the first glue layer can effectively prevent the burrs on the first tab from piercing into the first empty foil area and thus piercing the first electrode tab. Specifically, the battery cell can effectively avoid the burrs of the tab from piercing the foil. Further, the battery with this battery cell has better safety.

[0021] An electronic device according to an embodiment of the third aspect of the present utility model includes the battery described in the embodiment of the second aspect.

[0022] The electronic device according to the embodiment of the present utility model has at least the following beneficial effects: After the two sides of the first part of the first adhesive layer are respectively connected to the second end and the first empty foil area, and the second part protrudes relative to the first tab, the first adhesive layer can effectively prevent the burrs on the first tab from piercing into the first empty foil area, and thus piercing the first electrode tab. Specifically, the battery cell can effectively prevent the tab burrs from piercing the foil. Further, the battery with this battery cell has better safety. Still further, the electronic device with this battery also has better safety.

[0023] The additional aspects and advantages of the present utility model will be partly given in the following description, partly will become obvious from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0024] The following further describes the present utility model in conjunction with the drawings and embodiments, where:

[0025] Figure 1 is a partial schematic diagram of a battery cell according to the first embodiment of the present utility model;

[0026] Figure 2 is a partial schematic diagram of a battery cell according to the second embodiment of the present utility model;

[0027] Figure 3 is a schematic diagram of the first tab, the first electrode tab and the first adhesive layer in the battery cell according to some embodiments of the present utility model;

[0028] Figure 4 is a schematic diagram of the second tab, the second electrode tab and the second adhesive layer in the battery cell according to some embodiments of the present utility model.

[0029] Reference Signs:

[0030] Battery cell 10, First electrode tab 100, First empty foil area 110, First coating area 120, First tab 200, First end 210, Second end 220, First adhesive layer 300, First part 310, Second part 320, Accommodating groove 400, First tab adhesive 500, Second tab adhesive 600, Second electrode tab 700, Second empty foil area 710, Second coating area 720, Second tab 800, Third end 810, Fourth end 820, Second adhesive layer 900, Third part 910, Fourth part 920. Detailed Embodiments

[0031] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0032] In the description of the present utility model, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model 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 thus should not be construed as a limitation to the present utility model.

[0033] In the description of the present utility model, the meaning of several is more than one, the meaning of multiple is more than two, and understandings such as greater than, less than, exceeding, etc. do not include the present number, and understandings such as above, below, within, etc. include the present number. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0034] In the description of the present utility model, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.

[0035] In the description of the present utility model, the description referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0036] In the related art, during the manufacturing process of a battery, after the electrode sheet is manufactured, the tab needs to be welded to the electrode sheet. Specifically, an empty foil area is provided on the electrode sheet. After the tab is cut, the tab is welded to the empty foil area, thereby completing the welding of the tab to the electrode sheet.

[0037] Furthermore, burrs are generated during the cutting process of the tab. The burrs are generally on the end of the electrode sheet. After the side of the tab is welded to the electrode sheet, when the battery cell 10 is charged and discharged, the battery cell 10 will expand. When the battery cell 10 expands, the tab will be squeezed. The burrs at the end of the tab may abut against the foil and pierce the foil of the electrode sheet (the extending direction of the burrs at the end may be biased towards the foil rather than along the length direction of the tab), which may cause the battery cell 10 to be unable to be used normally. Therefore, the present application proposes a battery cell 10.

[0038] Please refer to Figure 1 and Figure 3 , in some embodiments, the battery cell 10 includes: a first electrode sheet 100, a first tab 200, and a first adhesive layer 300. The first electrode sheet 100 is provided with a first empty foil area 110. The specific structure of the first electrode sheet 100 with the first empty foil area 110 is that the first electrode sheet 100 includes a foil and an active material layer, and the active material layer can be coated on the foil to form the first electrode sheet 100. Among them, in some areas of the first electrode sheet 100, the active material layer is not coated, so as to form the first empty foil area 110, and the first tab 200 can be welded on the first empty foil area 110. The first electrode sheet 100 can be a positive electrode sheet or a negative electrode sheet. The first electrode sheet 100 can also be wound with a second electrode sheet 700 after being stacked to form the battery cell 10, or the first electrode sheet 100 and the second electrode sheet 700 are stacked to form a laminated battery cell 10. The first tab 200 is welded to the first empty foil area 110. The specific way of welding the first tab 200 to the first empty foil area 110 is to attach the first tab 200 to the first empty foil area 110, and then weld the first tab 200 to the first empty foil area 110 through a welding tooling. The first tab 200 includes opposite first end 210 and second end 220, and the first end 210 protrudes relative to the first electrode sheet 100 along the width direction of the first electrode sheet 100. The first end 210 of the first tab 200 can be conducted to the outside to realize charging and discharging. The first adhesive layer 300 can be silicone rubber or UV glue. The first adhesive layer 300 includes a first part 310 and a second part 320. The first adhesive layer 300 is adhered to the first empty foil area 110, wherein the first part 310 is connected to the second part 320, and both sides of the first part 310 are respectively connected to the second end 220 and the first empty foil area 110, and the second part 320 protrudes relative to the first tab 200. Specifically, after both sides of the first part 310 of the first adhesive layer 300 are respectively connected to the second end 220 and the first empty foil area 110, and the second part 320 protrudes relative to the first tab 200, the first adhesive layer 300 can effectively prevent the burrs on the first tab 200 from piercing into the first empty foil area 110, and thus piercing the first electrode sheet 100. Specifically, the battery cell 10 can effectively avoid the tab burrs from piercing the foil.

[0039] Next, the method of how the first adhesive layer 300 effectively prevents the burrs of the first tab 200 from piercing the first empty foil area 110 will be introduced again. Please refer to Figure 1 and Figure 3 , the first tab 200 is formed by cutting, and burrs will be present at the end of the first tab 200. Among them, the burrs may extend along the length direction of the first tab 200 or along the thickness direction of the first tab 200. Specifically, the shape of the burrs cannot be specifically set. When the end of the burrs faces the first empty foil area 110, the burrs may pierce the first empty foil area 110. Therefore, the setting of the first adhesive layer 300 can block the burrs, thereby effectively preventing the burrs of the first tab 200 from piercing the first empty foil area 110.

[0040] Furthermore, as mentioned above, in order to effectively prevent the burrs of the first tab 200 from piercing the first empty foil area 110, the first adhesive layer 300 is provided on the first empty foil. It can be imagined that in the prior art, there is no first adhesive layer 300 on the first empty foil area 110, so the situation where the thickness of the first empty foil area 110 is greater than that of the first coating area 120 will not occur. In this application, after adding the first adhesive layer 300, in order to prevent the final thickness of the first empty foil area 110 from being greater than the thickness of the first coating area 120, the method of setting the accommodation groove 400 can be adopted. Specifically, in some embodiments, the second end 220 and the first empty foil area 110 jointly define the accommodation groove 400, and the first part 310 is arranged in the accommodation groove 400. After the first adhesive layer 300 is attached to the first empty foil area 110, the second end 220 of the first tab 200 is arranged on the first part 310. By setting the accommodation groove 400, the first part 310 can be located in the accommodation groove 400, so that the final thickness of the first empty foil area 110 can be effectively prevented from being too large. The specific method of jointly defining the accommodation groove 400 by the second end 220 and the first empty foil area 110 can be to dig an empty groove on the second end 220 or an empty groove on the first empty foil area 110, so that the second end 220 and the first empty foil area 110 jointly define the accommodation groove 400.

[0041] Furthermore, the specific structure of the accommodation groove 400 will be introduced. Please refer to Figure 1 and Figure 3, in some embodiments, in the direction from the first end 210 to the second end 220, the distance between the second end 220 and the first empty foil area 110 gradually increases. The maximum distance between the second end 220 and the first empty foil area 110 can be 20 um, and the minimum distance can be 0. The thickness of the first part 310 of the first adhesive layer 300 gradually increases. Specifically, when manufacturing the battery cell 10, after cutting out the first tab 200, the cut first tab 200 can be flattened and shaped, which can remove a part of the burrs on the first tab 200. Among them, when flattening the first tab 200, the second end 220 of the first tab 200 can be bent, so that after the first tab 200 is welded to the first empty foil area 110, in the direction from the first end 210 to the second end 220, the distance between the second end 220 and the first empty foil area 110 gradually increases, which can reserve a certain space for the first part 310 of the first adhesive layer 300. In addition, the cross-section of the receiving groove 400 can be a right triangle. The receiving groove 400 can facilitate the accommodation of the first part 310. At the same time, the manufacturing process of the receiving groove 400 is relatively simple, which is beneficial to improving work efficiency.

[0042] Further, please refer to Figure 1 and Figure 3 , in some embodiments, the battery cell 10 further includes a first tab adhesive 200 and a second tab adhesive 800 600. The first tab adhesive 200 covers one side of the first empty foil area 110, one side of the first tab 200, and one side of the first adhesive layer 300. The second tab adhesive 800 600 covers the other side of the first empty foil area 110, the other side of the first tab 200, and the other side of the first adhesive layer 300. Specifically, the first tab adhesive 200 and the second tab adhesive 800 600 can cover the welding burrs generated after the first tab 200 is welded to the first empty foil area 110. Thus, this can effectively improve the safety performance of the battery cell 10. The first tab adhesive 200 and the second tab adhesive 800 600 can be adhesive tapes. In addition, the first tab adhesive 200 can also cover one side of the second empty foil area 710, one side of the second tab 800, and one side of the second adhesive layer 900. The second tab adhesive 800 600 can also cover the other side of the second empty foil area 710, the other side of the second tab 800, and the other side of the second adhesive layer 900.

[0043] Further, the specific structure of the first electrode sheet 100 will be introduced below. Please refer to Figure 1 and Figure 3, in some embodiments, the first electrode tab 100 includes a first empty foil region 110 and two first coating regions 120, and the two first coating regions 120 are respectively connected to both ends of the first empty foil region 110. Among them, an active material layer is provided on the first coating region 120, and no active material layer is provided on the first empty foil region 110. After the first electrode tab 100 and the second electrode tab 700 are stacked and wound, a cylindrical battery cell 10 can be formed. In addition, in some other embodiments, the first electrode tab 100 further includes a third first coating region 120, and the three first coating regions 120 are connected around the first empty foil region 110, which can facilitate the formation of a wound battery cell 10 after the first electrode tab 100 and the second electrode tab 700 are stacked.

[0044] Further, in some embodiments, the thickness of the first adhesive layer 300 is L1, and 10um ≤ L1 ≤ 20um. L1 is 10um, 12um, 15um, 18um or 20um. Specifically, when the thickness of the first adhesive layer 300 is less than 10um, since the thickness of the first adhesive layer 300 is small, it may cause burrs to pierce through the first adhesive layer 300 and the first empty foil region 110. When the thickness of the first adhesive layer 300 is greater than 20um, the manufacturing cost of the first adhesive layer 300 will be too high when the first adhesive layer 300 can effectively block burrs.

[0045] Further, the second electrode tab 700 will be introduced below. Please refer to Figure 2 and Figure 4, in some embodiments, the battery cell 10 further includes a second electrode tab 700, a second tab 800, and a second adhesive layer 900. The second electrode tab 700 is provided with a second non-coated foil area 710. The specific structure of the second electrode tab 700 having the second non-coated foil area 710 is that the second electrode tab 700 includes a foil material and an active material layer, and the active material layer can be coated on the foil material to form the second electrode tab 700. Among them, in some areas of the second electrode tab 700, the active material layer is not coated, so as to form the second non-coated foil area 710, and the second tab 800 can be welded to the second non-coated foil area 710. The first electrode tab 100 can be a positive electrode tab or a negative electrode tab. The second tab 800 is welded to the second non-coated foil area 710. The foil materials of the first electrode tab 100 and the second electrode tab 700 can be aluminum foil or copper foil, which depends on the actual situation. The second tab 800 includes an opposite third end 810 and a fourth end 820, and the third end 810 protrudes relative to the second electrode tab 700 in the width direction of the second electrode tab 700. The second adhesive layer 900 can be silicone rubber or UV glue. The second adhesive layer 900 includes a third part 910 and a fourth part 920. The third part 910 is connected to the fourth part 920. The two sides of the third part 910 are respectively connected to the fourth end 820 and the second non-coated foil area 710, and the fourth part 920 protrudes relative to the second tab 800. Among them, after the two sides of the third part 910 of the second adhesive layer 900 are respectively connected to the fourth end 820 and the second non-coated foil area 710, and the fourth part 920 protrudes relative to the second tab 800, the second adhesive layer 900 can effectively prevent the burrs on the second tab 800 from piercing into the second non-coated foil area 710, and thus piercing the second electrode tab 700. Specifically, the safety of the battery cell 10 is relatively high.

[0046] Further, in some embodiments, the thickness of the second adhesive layer 900 is L2, and 10um ≤ L2 ≤ 20um. L2 is 10um, 12um, 15um, 18um, or 20um. Specifically, when the thickness of the second adhesive layer 900 is less than 10um, due to the small thickness of the second adhesive layer 900, it may cause the burrs to pierce through the second adhesive layer 900 and the burrs to pierce through the second non-coated foil area 710. When the thickness of the second adhesive layer 900 is greater than 20um, the manufacturing cost of the second adhesive layer 900 will be too high in the case where the second adhesive layer 900 can effectively block the burrs.

[0047] Further, the specific structure of the second electrode tab 700 will be introduced below. Please refer to Figure 2 and Figure 4, in some embodiments, the second electrode tab 700 includes a second empty foil region 710 and two second coating regions 720, and the two second coating regions 720 are respectively connected to two ends of the second empty foil region 710. Among them, an active material layer is provided on the second coating region 720, and no active material layer is provided on the second empty foil region 710. After the first electrode tab 100 and the second electrode tab 700 are stacked and wound, a cylindrical battery cell 10 can be formed. In addition, in some other embodiments, the second electrode tab 700 further includes a third second coating region 720, and the three second coating regions 720 are connected around the second empty foil region 710, which can facilitate the formation of a wound battery cell 10 after the first electrode tab 100 and the second electrode tab 700 are stacked.

[0048] In some embodiments, the battery includes the battery cell 10 of any one of the above embodiments. After the first part 310 of the first adhesive layer 300 is respectively connected to the second end 220 and the first empty foil region 110 on both sides, and the second part 320 protrudes relative to the first electrode tab 200, the first adhesive layer 300 can effectively prevent the burrs on the first electrode tab 200 from piercing into the first empty foil region 110 and thus piercing the first electrode tab 100. Specifically, the battery cell 10 can effectively prevent the burrs of the electrode tab from piercing the foil. Further, the battery with the battery cell 10 has better safety.

[0049] In some embodiments, the electronic device includes the battery of the above embodiments. After the first part 310 of the first adhesive layer 300 is respectively connected to the second end 220 and the first empty foil region 110 on both sides, and the second part 320 protrudes relative to the first electrode tab 200, the first adhesive layer 300 can effectively prevent the burrs on the first electrode tab 200 from piercing into the first empty foil region 110 and thus piercing the first electrode tab 100. Specifically, the battery cell 10 can effectively prevent the burrs of the electrode tab from piercing the foil. Further, the battery with the battery cell 10 has better safety. Still further, the electronic device with the battery also has better safety.

[0050] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A battery cell, characterized in that, Comprising: A first electrode tab, provided with a first empty foil area; A first tab, welded to the first empty foil area, the first tab including opposite first and second ends, the first end protruding relative to the first electrode tab in the width direction of the first electrode tab; A first adhesive layer, including a first part and a second part, the first part connected to the second part, two sides of the first part respectively connected to the second end and the first empty foil area, the second part protruding relative to the first tab; 2. The battery cell according to claim 1, wherein The second end and the first empty foil area jointly define a receiving groove, and the first part is disposed in the receiving groove; 3. The cell according to claim 2, wherein In the direction from the first end to the second end, the distance between the second end and the first empty foil area gradually increases, and the thickness of the first part gradually increases; 4. The battery cell according to claim 1, wherein The battery cell further includes a first tab adhesive and a second tab adhesive, the first tab adhesive covering one side of the first empty foil area, one side of the first tab, and one side of the first adhesive layer, the second tab adhesive covering the other side of the first empty foil area, the other side of the first tab, and the other side of the first adhesive layer; 5. The battery cell according to claim 1, characterized in that, The first electrode tab includes the first empty foil area and two first coating areas, and the two first coating areas are respectively connected to two ends of the first empty foil area; 6. The battery cell according to claim 1, characterized in that The thickness of the first adhesive layer is L1, 10um ≤ L1 ≤ 20um; 7. The battery cell according to claim 1, wherein, The battery cell further includes a second electrode tab, a second tab, and a second adhesive layer; The second electrode tab is provided with a second empty foil area; The second tab is welded to the second empty foil area, the second tab including opposite third and fourth ends, the third end protruding relative to the second electrode tab in the width direction of the second electrode tab; The second adhesive layer includes a third part and a fourth part, the third part connected to the fourth part, two sides of the third part respectively connected to the fourth end and the second empty foil area, the fourth part protruding relative to the second tab; 8. The battery cell according to claim 7, wherein, The thickness of the second adhesive layer is L2, 10um ≤ L2 ≤ 20um; 9. A battery, characterized in that, Comprising the battery cell according to any one of claims 1 to 8; 10. An electronic device, characterized in that, Comprising the battery according to claim 9.

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