Battery pole piece and battery

Abstract

The utility model discloses a battery pole piece and discloses a battery with the battery pole piece, the battery pole piece comprises a pole piece body and an insulating part, the pole piece body is provided with a single-face area, the single-face area is provided with a porous structure, the insulating part is arranged on one side of the single-face area in the thickness direction, and the insulating part covers the corresponding porous structure. The slurry can be prevented from leaking from one side of the single-sided area in the thickness direction, so that the coating equipment can coat the single-sided area of the pole piece body, and the processing requirements of the pole piece body can be met.

Description

Technical Field

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

[0002] In order to improve the consistency of the cell rate and electrode thickness direction, the battery pole piece can use a pole piece body with a porous structure, and the slurry is filled into the porous structure of the pole piece body by filling, soaking or dry extrusion. Compared with the conventional pole piece body, the pole piece body with a porous structure cannot be coated on one side. However, the upper and lower outermost layers of the battery pole piece with a laminated structure need to be coated on one side, or the inner or outer ring of the battery pole piece with a wound structure needs to be coated on one side, which cannot meet the processing requirements of the battery pole piece. 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 pole piece that can meet the processing requirements of the battery pole piece.

[0004] The utility model also provides a battery having the battery pole piece.

[0005] The battery pole piece according to the first aspect of the present invention comprises a pole piece body and an insulating member, wherein the pole piece body is provided with a single-sided area, the single-sided area has a porous structure, the insulating member is provided on one side of the single-sided area in the thickness direction, and the insulating member covers the corresponding porous structure.

[0006] The battery pole piece according to the first aspect of the present utility model has at least the following beneficial effects:

[0007] Before single-sided coating of the pole piece body, an insulating member is first arranged on the single-sided area of ​​the pole piece body, and then the coating equipment can coat the single-sided area of ​​the pole piece body, which can prevent the slurry from leaking from one side of the thickness direction of the single-sided area, and can coat the pole piece body on one side to meet the processing requirements of the pole piece body. According to some embodiments of the utility model, the insulating member is configured as adhesive tape, and the adhesive tape is bonded to the pole piece body.

[0008] According to some embodiments of the utility model, the adhesive tape includes a first adhesive layer and a substrate, the first adhesive layer and the substrate are stacked, and the first adhesive layer is bonded to the pole piece body.

[0009] According to some embodiments of the utility model, the adhesive tape also includes a second adhesive layer and a protective layer, one side of the second adhesive layer is connected to the side of the substrate facing away from the first adhesive layer, the other side of the second adhesive layer is connected to the protective layer, and the side of the protective layer away from the second adhesive layer is used to connect to the packaging film of the battery.

[0010] According to some embodiments of the present utility model, the protective layer is made of hot melt adhesive material.

[0011] According to some embodiments of the present utility model, the thickness of the first adhesive layer is H1, the thickness of the base material is H2, the thickness of the second adhesive layer is H3, and the thickness of the protective layer is H4. The sum of H1, H2, H3, and H4 is H5, and H5 satisfies: 27μm < H5 < 40μm.

[0012] According to some embodiments of the present utility model, the insulating member is configured as a ceramic layer, and the ceramic layer covers the single-sided area.

[0013] According to some embodiments of the present utility model, the thickness of the ceramic layer is greater than 4μm.

[0014] According to some embodiments of the present utility model, the length of the ceramic layer is equal to the length of the single-sided area, and the width of the ceramic layer is equal to the width of the single-sided area.

[0015] The battery according to the embodiments of the second aspect of the present utility model includes the battery electrode sheet described in the above embodiments.

[0016] The battery according to the embodiments of the second aspect of the present utility model has at least the following beneficial effects:

[0017] Before performing single-sided coating on the electrode sheet body, an insulating member is first provided in the single-sided area of the electrode sheet body, and then the coating device can perform coating on the single-sided area of the electrode sheet body, which can avoid the leakage of the slurry from one side in the thickness direction of the single-sided area, and can perform single-sided coating on the electrode sheet body to meet the processing requirements of the electrode sheet body.

[0018] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0019] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0020] Figure 1 is a schematic structural diagram of the battery electrode sheet according to the embodiment of the present utility model;

[0021] Figure 2 is another schematic diagram of an embodiment of the battery electrode sheet according to the embodiment of the present utility model.

[0022] Reference Signs:

[0023] The electrode sheet body 100, the adhesive tape 200, the first adhesive layer 210, the base material 220, the second adhesive layer 230, the protective layer 240, and the ceramic layer 300. Detailed implementation manners

[0024] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, in which 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 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.

[0025] In the description of the present utility model, it should be understood that for the orientation description, such as the upper, lower, front, rear, left, right, etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the 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.

[0026] In the description of the present utility model, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, exceeding, etc. are understood as not including the present number, and above, below, within, etc. are understood as including the present number. If the first and second are described only for the purpose of distinguishing technical features, they should not be understood 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.

[0027] 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.

[0028] In the related art, in order to improve the rate performance of the battery cell and the consistency in the thickness direction of the electrode, the battery electrode sheet may adopt an electrode sheet body with a porous structure, and the slurry is filled into the porous structure of the electrode sheet body by means of filling, soaking or dry extrusion. Compared with the conventional electrode sheet body, the electrode sheet body with a porous structure cannot be coated on one side. However, the outermost layers on the upper and lower sides of the laminated structure battery electrode sheet need to be coated on one side, or the inner or outer ring of the wound structure battery electrode sheet needs to be coated on one side, which cannot meet the processing requirements of the battery electrode sheet.

[0029] Refer to Figure 1 、 Figure 2, The battery electrode sheet according to the embodiment of the first aspect of the present invention includes an electrode sheet body 100 and an insulating member. The electrode sheet body 100 is provided with a single-sided area, and the single-sided area has a porous structure. The insulating member is disposed on one side in the thickness direction of the single-sided area, and the insulating member covers the corresponding porous structure. Thus, by providing the insulating member, it is possible to prevent the slurry from leaking from one side in the thickness direction of the single-sided area, so that the coating equipment can coat the single-sided area of the electrode sheet body 100, and the processing requirements of the electrode sheet body 100 can be met.

[0030] Specifically, before performing single-sided coating on the electrode sheet body 100, first set an insulating member in the single-sided area of the electrode sheet body 100, and then the coating equipment can coat the single-sided area of the electrode sheet body 100, which can prevent the slurry from leaking from one side in the thickness direction of the single-sided area, and can perform single-sided coating on the electrode sheet body 100 to meet the processing requirements of the electrode sheet body 100.

[0031] It should be noted that the insulating member is made of an insulating material, which can prevent the electrode sheet body 100 from conducting electricity with the battery housing through insulation, and can improve the use safety of the battery.

[0032] It should be noted that along the thickness direction of the electrode sheet body 100, the porous structure penetrates the electrode sheet body 100, so that the electrode sheet body 100 can be double-sided coated, thereby improving the cell rate.

[0033] Refer to Figure 1 , In some embodiments of the present invention, the insulating member is configured as a sticker 200, and the sticker 200 is bonded to the electrode sheet body 100, which can facilitate the assembly of the insulating member and can completely cover the porous structure to effectively block the penetration of the slurry to the other side of the single-sided area of the electrode sheet body 100.

[0034] Specifically, when assembling the insulating member, just stick the sticker 200 on one side of the single-sided area of the electrode sheet body 100. The operation is simple, convenient and fast, which can facilitate the assembly of the insulating member and can completely cover the porous structure to effectively block the penetration of the slurry to the other side of the single-sided area of the electrode sheet body 100.

[0035] It should be noted that the length of the sticker 200 is greater than or equal to the length of the single-sided area, and the width of the sticker 200 is greater than or equal to the width of the single-sided area, so that the sticker 200 can completely cover the porous structure. Specifically, when the length of the sticker 200 is greater than the length of the single-sided area, and / or when the width of the sticker 200 is greater than or equal to the width of the single-sided area, the sticker can be cut by a cutting die or cutting equipment so that the length of the sticker 200 is equal to the length of the single-sided area and the width of the sticker 200 is equal to the width of the single-sided area, which can reduce the occupied space of the sticker 200 and thus improve the energy density of the battery. Details are not described herein.

[0036] Refer to Figure 1In some embodiments of the utility model, the adhesive tape 200 includes a first adhesive layer 210 and a substrate 220. The first adhesive layer 210 and the substrate 220 are stacked. The first adhesive layer 210 is bonded to the pole piece body 100, which can facilitate the assembly of insulating parts and can completely cover the porous structure to effectively prevent the slurry from penetrating to the other side of the single-sided area of ​​the pole piece body 100.

[0037] Specifically, along the thickness direction of the pole piece body 100, the first adhesive layer 210 and the substrate 220 are stacked, and the side of the first adhesive layer 210 away from the substrate 220 is bonded to the single-sided area of ​​the pole piece body 100. The substrate 220 blocks the slurry from penetrating to the side where the pole piece body 100 is connected to the adhesive tape 200, and can completely cover the porous structure to effectively block the slurry from penetrating to the other side of the single-sided area of ​​the pole piece body 100.

[0038] Reference Figure 1 In some embodiments of the present invention, the adhesive tape 200 also includes a second adhesive layer 230 and a protective layer 240, one side of the second adhesive layer 230 is connected to the side of the substrate 220 away from the first adhesive layer 210, and the other side of the second adhesive layer 230 is connected to the protective layer 240, and the side of the protective layer 240 away from the second adhesive layer 230 is used to connect to the packaging film of the battery, which can improve the drop resistance of the battery to improve the safety of battery use.

[0039] Specifically, the first adhesive layer 210, the substrate 220, the second adhesive layer 230 and the protective layer 240 are stacked in sequence, and the side of the protective layer 240 away from the second adhesive layer 230 is connected to the packaging film of the battery, which can improve the drop resistance of the battery and thus improve the safety of battery use.

[0040] It should be pointed out that the packaging film of the battery is generally an aluminum-plastic film, which is not limited here.

[0041] Reference Figure 1 In some embodiments of the present invention, the protective layer 240 is made of hot melt adhesive material, which can facilitate the assembly of insulating parts and improve the assembly efficiency of insulating parts.

[0042] Specifically, when assembling the insulating parts, the protective layer 240 is heated. When the temperature of the protective layer 240 reaches a certain temperature, the protective layer 240 and the adhesive layer are hot-melted, so that the protective layer 240 obtains bonding ability to be connected with the packaging film of the battery. The operation is simple, convenient and fast, and it is easy to assemble the insulating parts to improve the assembly efficiency of the insulating parts.

[0043] Reference Figure 1, in some embodiments of the present utility model, the thickness of the first adhesive layer 210 is H1, the thickness of the substrate 220 is H2, the thickness of the second adhesive layer 230 is H3, and the thickness of the protective layer 240 is H4. The sum of H1, H2, H3, and H4 is H5, and H5 satisfies: 27μm < H5 < 40μm, so that the insulating member can effectively block the penetration of the slurry to the side where the insulating member is connected to the electrode sheet body 100, and at the same time, can reduce the occupied space of the insulating member to improve the energy density of the battery.

[0044] Specifically, when H5 is greater than 27μm, the insulating member can effectively block the penetration of the slurry to the side where the insulating member is connected to the electrode sheet body 100. When H5 is less than 40μm, the thickness of the insulating member can be reduced to reduce the occupied space of the insulating member, thereby improving the energy density of the battery.

[0045] It should be noted that H1 satisfies: 6μm < H1 < 10μm, 10μm < H2 < 12μm, 5μm < H3 < 7μm, 6μm < H4 < 8μm, and there is no limitation here.

[0046] Refer to Figure 2 , in some embodiments of the present utility model, the insulating member is configured as a ceramic layer 300. The ceramic layer 300 covers the single-sided area, which can facilitate the assembly of the insulating member and can completely cover the porous structure to effectively block the penetration of the slurry to the other side of the single-sided area of the electrode sheet body 100.

[0047] Specifically, the ceramic layer 300 has good insulation ability. The ceramic layer 300 can be provided on the single-sided area of the electrode sheet body 100 in a coating manner, which can facilitate the assembly of the insulating member and can completely cover the porous structure to effectively block the penetration of the slurry to the other side of the single-sided area of the electrode sheet body 100.

[0048] Refer to Figure 2 , in some embodiments of the present utility model, the thickness of the ceramic layer 300 is greater than 4μm, so that the thickness of the ceramic layer 300 can meet the use requirements of the battery.

[0049] It should be noted that compared with the adhesive tape 200, the ceramic layer 300 is a granular structure, and the density of the ceramic layer 300 is lower than that of the adhesive tape 200, resulting in the barrier performance of the ceramic layer 300 being slightly lower than that of the adhesive tape 200. Details are not described here.

[0050] Refer to Figure 2 , in some embodiments of the present utility model, the length of the ceramic layer 300 is equal to the length of the single-sided area, and the width of the ceramic layer 300 is equal to the width of the single-sided area, so that the ceramic layer 300 can completely cover the porous structure of the single-sided area, enabling the ceramic layer 300 to effectively block the penetration of the slurry to the side of the electrode sheet body 100 connected to the ceramic layer 300, and improving the use safety of the battery.

[0051] Referring to Figure 1 、 Figure 2 According to the battery of the second aspect embodiment of the present utility model, it includes the battery electrode sheet of the first aspect embodiment of the present utility model. By setting an insulating member, it can avoid the leakage of the slurry from one side in the thickness direction of the single-sided area, so that the coating equipment can coat the single-sided area of the electrode sheet body 100, and can meet the processing requirements of the electrode sheet body 100.

[0052] Specifically, before performing single-sided coating on the electrode sheet body 100, first set an insulating member on the single-sided area of the electrode sheet body 100, and then the coating equipment can coat the single-sided area of the electrode sheet body 100, which can avoid the leakage of the slurry from one side in the thickness direction of the single-sided area, and can perform single-sided coating on the electrode sheet body 100 to meet the processing requirements of the electrode sheet body 100.

[0053] It should be noted that when the battery cell is a stacked cell, the electrode sheet body 100 at the topmost has a single-sided area, the electrode sheet body 100 at the bottommost has a single-sided area, and the electrode sheet bodies 100 in the middle position all have double-sided areas. In this way, the coating quality of the electrode sheet body 100 can be improved, and the production and manufacturing cost of the battery electrode can be reduced, thereby reducing the production and manufacturing cost of the battery; when the battery cell is a wound cell, the single-sided area is located at the start end of the wound cell, the single-sided area is located at the terminal end of the wound cell, and the double-sided area is located in the middle position of the wound cell. In this way, the coating quality of the electrode sheet body 100 can be improved, and the production and manufacturing cost of the battery electrode can be reduced, thereby reducing the production and manufacturing cost of the battery.

[0054] It should be noted that the coating weight of the single-sided area is half of the coating weight of the double-sided area, which will not be elaborated here.

[0055] It should be pointed out that the specific structure of the stacked cell is specifically that the positive electrode sheet, the separator, the negative electrode sheet, and the separator are stacked alternately, and the separator is located between the adjacent positive electrode sheet and the negative electrode sheet. Through a pressing device, the alternately stacked positive electrode sheet, separator, negative electrode sheet, and separator are pressed to form a stacked cell; the specific structure of the wound cell is specifically that the positive electrode sheet, the separator, the negative electrode sheet, and the separator are stacked, and then the positive electrode sheet, separator, negative electrode sheet, and separator as a whole are wound to form a wound cell.

[0056] It can be understood that the process flow of single-sided coating is as follows: the electrode sheet body placed on the unwinding device enters the floating roller tension system after automatic deviation correction. After adjusting the unwinding tension, it enters the coating head, and the slurry is coated according to the set program of the coating system. The wet electrode sheet after coating enters the oven and is dried by hot air. The dried electrode sheet adjusts the tension through the tension system, and at the same time controls the winding speed to make it synchronous with the coating speed. The electrode sheet is automatically corrected by the deviation correction system to keep it in the central position and is wound by the winding device.

[0057] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0058] The above has described this embodiment in detail with reference to the accompanying drawings. However, the present invention is not limited to the above embodiment, and various changes can be made without departing from the gist of the invention within the knowledge scope of those of ordinary skill in the art.

Claims

1. A battery electrode sheet, characterized in that, include: The pole piece body (100) is provided with a single-sided area, wherein the single-sided area has a porous structure; An insulating member is arranged on one side of the single-sided area in the thickness direction, and the insulating member covers the corresponding porous structure. The insulating member is configured as adhesive tape (200), and the adhesive tape (200) is bonded to the pole piece body (100). The adhesive tape (200) includes a first adhesive layer (210) and a substrate (220). The first adhesive layer (210) and the substrate (220) are stacked, and the first adhesive layer (210) is bonded to the pole piece body (100).

2. The battery electrode sheet according to claim 1, characterized in that, The adhesive tape (200) also includes a second adhesive layer (230) and a protective layer (240), one side of the second adhesive layer (230) is connected to the side of the substrate (220) facing away from the first adhesive layer (210), the other side of the second adhesive layer (230) is connected to the protective layer (240), and the side of the protective layer (240) away from the second adhesive layer (230) is used to connect to the packaging film of the battery.

3. The battery electrode sheet according to claim 2, characterized in that, The protective layer (240) is made of hot melt adhesive material.

4. The battery electrode sheet according to claim 3, characterized in that, The thickness of the first adhesive layer (210) is H1, the thickness of the substrate (220) is H2, the thickness of the second adhesive layer (230) is H3, the thickness of the protective layer (240) is H4, the sum of H1, H2, H3 and H4 is H5, and H5 satisfies: 27 μm<H5<40 μm.

5. A battery, characterized in that, Comprising the battery pole piece as described in any one of claims 1 to 4.

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