Tab leading-out sheet, battery device and electric equipment

Abstract

The embodiment of the invention provides a tab lead-out piece, a battery device and electric equipment, and belongs to the technical field of batteries. The tab lead-out sheet comprises a metal sheet, wherein the metal sheet sequentially comprises a tab connecting section, a rubberizing section and a pole connecting section along the length direction of the metal sheet; the tab glue layer comprises a first connecting section and a second connecting section along the length direction of the metal sheet, the first connecting section is connected to the rubberizing section in an insulating manner, the second connecting section is positioned on the side of the tab connecting section, and the second connecting section is configured to be connected with the tab connecting section after the tab connecting section is welded with the battery cell tab. Therefore, the aluminum-plastic film is effectively prevented from being damaged, and the effect of reducing the short-circuit leakage probability of the existing battery device is achieved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a tab lead-out sheet, a battery device, and an electrical device. Background Art

[0002] The battery cell tabs of the battery device are connected to tab lead-out sheets, and are connected to the circuit via the tab lead-out sheets.

[0003] In the prior art, the tab lead-out piece includes a metal sheet and a tab glue layer. The metal sheet includes a tab connection section, a glue section and a pole connection section in sequence. The tab connection section is used to be welded to the tab of the battery cell and is wrapped with an aluminum-plastic film. The tab glue layer is coated on the glue section to prevent the welding burrs of the tab connection section from piercing the aluminum-plastic film. The pole connection section is used to connect to the circuit.

[0004] However, the existing tab lead-out structure is prone to causing short circuits and leakage in the battery device. Summary of the Invention

[0005] The embodiments of the present application provide a tab lead-out sheet, a battery device, and an electrical device to reduce the probability of short circuit and leakage in existing battery devices.

[0006] In a first aspect, an embodiment of the present application provides a tab lead-out sheet, comprising:

[0007] The metal sheet includes a tab connection section, a glue section, and a pole connection section in sequence along its length direction;

[0008] The tab adhesive layer includes a first connecting segment and a second connecting segment along the length direction of the metal sheet, the first connecting segment is connected to the adhesive segment, the second connecting segment is located on the side of the tab connecting segment, and the second connecting segment is configured to be connected to the tab connecting segment after the tab connecting segment is welded to the battery cell tab.

[0009] In a possible embodiment, the tab lead-out sheet provided in the embodiment of the present application has two tab adhesive layers, which are respectively located on opposite sides of the metal sheet, and the first connecting sections of the two tab adhesive layers are interconnected to cover the adhesive section.

[0010] In a possible implementation manner, the tab lead-out piece provided in the embodiment of the present application has the same width as the tab connection section and the adhesive section;

[0011] The width of the first connecting section is greater than the width of the adhesive section;

[0012] The width of the second connecting segment is greater than or equal to the width of the first connecting segment.

[0013] In a possible implementation, in the tab lead-out piece provided in the embodiment of the present application, the width difference between the first connecting section and the adhesive-applied section is greater than or equal to 10 mm and less than or equal to 40 mm.

[0014] In a possible implementation manner, in the tab lead-out piece provided in the embodiment of the present application, the length of the second connecting section is greater than or equal to the length of the tab connecting section.

[0015] In a possible implementation, in the tab lead-out piece provided in the embodiment of the present application, the length difference between the second connecting section and the tab connecting section is greater than 0 mm and less than or equal to 20 mm.

[0016] In a possible implementation, the tab lead-out piece provided in the embodiment of the present application has a thickness of the first connecting section greater than or equal to 50 μm and less than or equal to 200 μm.

[0017] In a possible implementation, in the tab lead-out piece provided in the embodiment of the present application, the thickness of the second connecting section is greater than or equal to 30 μm and less than or equal to 300 μm.

[0018] In a possible implementation, the material of the tab lead-out piece provided in the embodiment of the present application, the first connecting section and / or the second connecting section includes at least one of polypropylene, polyethylene, and polyethylene terephthalate.

[0019] In a possible implementation, in the tab lead-out sheet provided in the embodiment of the present application, the first connecting section and the second connecting section each include two outer layers and at least one core layer disposed between the two outer layers along their thickness direction.

[0020] In one possible embodiment, the tab lead-out piece provided in the embodiment of the present application has, at least in the first connecting section and the second connecting section of the same tab glue layer, the outer layers have the same material, the outer layers have a different material from the core layer, and the core layers have different materials.

[0021] In a possible implementation, the tab lead-out piece provided in the embodiment of the present application, the first connecting section and the second connecting section both further include a modified material.

[0022] In a possible embodiment, the modified material of the tab lead-out sheet provided in the embodiment of the present application includes at least one of maleic anhydride, diethyl maleate, dibutyl maleate, and maleic acid monoester.

[0023] In one possible implementation, the tab lead-out sheet provided in the embodiment of the present application has a modified material content greater than or equal to 0.5% and less than or equal to 5%.

[0024] In a possible implementation, the tab lead-out piece provided in the embodiment of the present application further includes an adhesive layer, which is arranged on a side of the second connecting section facing the tab connecting section, and the second connecting section is connected to the tab connecting section through the adhesive layer.

[0025] In a possible implementation manner, in the tab lead-out sheet provided in the embodiment of the present application, the area of ​​the adhesive layer is consistent with the area of ​​the second connecting section.

[0026] In a possible implementation, the thickness of the adhesive layer of the tab lead-out sheet provided in the embodiment of the present application is greater than or equal to 10 μm and less than or equal to 40 μm.

[0027] In a possible implementation manner, the tab lead-out sheet provided in the embodiment of the present application has an adhesive layer that is a pressure-sensitive adhesive layer.

[0028] In a possible implementation, the material of the pressure-sensitive adhesive layer of the tab lead-out sheet provided in the embodiment of the present application includes at least one of acrylic acid and acrylate.

[0029] In a second aspect, an embodiment of the present application provides a battery device, comprising a battery device body and any one of the above-mentioned tab lead-out pieces disposed on the battery device body.

[0030] In a third aspect, an embodiment of the present application further provides an electrical device, comprising an electrical device body and the above-mentioned battery device disposed on the electrical device body.

[0031] The embodiments of the present application provide a tab lead-out piece, a battery device, and an electrical device, wherein the tab lead-out piece includes a metal sheet and a tab adhesive layer, wherein the metal sheet is sequentially divided into a tab connection section, an adhesive section, and a pole connection section along its own length direction, and the tab adhesive layer is also divided into a first connection section and a second connection section along its length direction. The first connection section is connected to the adhesive section, and the second connection section covers the tab connection section, so that the second connection section is located on the side of the first connection section facing the tab connection section, so that the presence of the second connection section eliminates the sharp corner of the first connection section facing the tab connection section, thereby preventing the sharp corner from piercing the aluminum-plastic film. At the same time, since the second connection section can be connected and attached to the tab connection section after the tab connection section is welded to the battery cell tab, the second connection section can be separated between the aluminum-plastic film and the tab connection section, thereby preventing the aluminum-plastic film from adhering to the tab connection section during heat sealing, thereby preventing the subsequent detachment and damage of the aluminum-plastic film. In this way, damage to the aluminum-plastic film is effectively prevented, thereby achieving the effect of reducing the probability of short circuit and leakage of existing battery devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0033] Figure 1 A schematic diagram of the structure of the tab connecting piece provided in an embodiment of the present application;

[0034] Figure 2 for Figure 1 A schematic diagram of the structure of the middle tab connecting piece from another perspective;

[0035] Figure 3 for Figure 2 Schematic diagram of the partial structure of the middle tab connecting piece.

[0036] Description of reference numerals:

[0037] 100-metal sheet; 110-ear connecting section; 120-glue section; 130-pole connecting section;

[0038] 200-tab rubber layer; 210-first connecting section; 220-second connecting section;

[0039] 300-adhesive layer.

[0040] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0041] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. The following embodiments and features in the embodiments can be combined with each other unless there is a conflict.

[0042] In the prior art, the tab lead-out piece includes a metal sheet and a tab glue layer. The metal sheet includes a tab connection section, a glue section and a pole connection section in sequence. The tab connection section is used to be welded to the tab of the battery cell and is wrapped with an aluminum-plastic film. The tab glue layer is coated on the glue section to prevent the welding burrs of the tab connection section from piercing the aluminum-plastic film. The pole connection section is used to connect to the circuit.

[0043] However, since the glue section occupies a shorter length of the metal sheet, the corresponding length of the tab glue is shorter, and it melts and deforms when the aluminum-plastic film is heat-sealed, making the tab glue a rectangular block with eight relatively hard sharp corners, four of which face the battery cell. During the subsequent use of the battery device, the sharp corners of the tab glue facing the battery cell may puncture the aluminum-plastic film due to factors such as vibration and bending of the tab lead-out sheet, causing the battery device to short-circuit and leak.

[0044] Moreover, when the tab glue and the aluminum-plastic film are heat-sealed, the metal sheet is heated, causing the tab connection section of the metal sheet to adhere to the aluminum-plastic film. During the subsequent assembly, transportation and handling of the battery cell, the tab connection section is forced to separate, causing the aluminum-plastic film to break, resulting in a short circuit and leakage of the battery device.

[0045] In addition, currently, the tab connection section after welding is protected by coating it with solder joint protective glue, but the solder joint protective glue is thin and has poor electrolyte resistance.

[0046] In order to overcome the defects in the prior art, the embodiments of the present application provide a tab lead-out sheet, a battery device, and an electrical device. The tab lead-out sheet includes a metal sheet and a tab adhesive layer, wherein the metal sheet is sequentially divided into a tab connection section, an adhesive section, and a pole connection section along its own length direction, and the tab adhesive layer is also divided into a first connection section and a second connection section along its length direction. The first connection section is connected to the adhesive section, and the second connection section covers the tab connection section, so that the second connection section is located on the side of the first connection section facing the tab connection section, so that the presence of the second connection section eliminates the sharp corner of the first connection section facing the tab connection section, thereby preventing the sharp corner from piercing the aluminum-plastic film. At the same time, since the second connection section can be connected and attached to the tab connection section after the tab connection section is welded to the battery cell tab, the second connection section can be separated between the aluminum-plastic film and the tab connection section, thus preventing the aluminum-plastic film from adhering to the tab connection section during heat sealing, thereby preventing the aluminum-plastic film from being detached and damaged. This effectively prevents damage to the aluminum-plastic film, achieving the effect of reducing the probability of short circuit leakage in existing battery devices.

[0047] The content of the present invention will be described in detail below with reference to the accompanying drawings so that those skilled in the art can understand the content of the present invention more clearly and in detail.

[0048] Reference Figures 1 to 3 As shown, in some embodiments, the present application provides a tab lead-out sheet, including:

[0049] The metal sheet 100 includes a tab connection section 110, a glue section 120 and a pole connection section 130 in sequence along its length direction;

[0050] The tab adhesive layer 200 includes a first connecting segment 210 and a second connecting segment 220 along the length direction of the metal sheet 100. The first connecting segment 210 is connected to the adhesive segment 120, and the second connecting segment 220 is located on the side of the tab connecting segment 110. The second connecting segment 220 is configured to be connected to the tab connecting segment 110 after the tab connecting segment 110 is welded to the battery cell tab.

[0051] It can be understood that the metal sheet 100 is integrally formed and is divided into a tab connection section 110, a glue section 120 and a pole connection section 130 along the length direction, wherein the tab connection section 110 is used for welding with the battery cell tab, the glue section 120 is used for attaching the tab glue 200 to prevent the burrs after welding of the tab connection section 110 from piercing the aluminum-plastic film heat-sealed at the welding point of the tab connection section 110, and the pole connection section 130 is used for electrically connecting with the positive and negative poles of the battery.

[0052] The tab adhesive layer 200 is also integrally formed and is divided into a first connecting section 210 and a second connecting section 220 along the length direction of the metal sheet 100, wherein the first connecting section 210 is correspondingly connected to the adhesive section 120, and the second connecting section 220 is connected to the side of the first connecting section 210 facing the tab connecting section 110, and corresponds to covering the tab connecting section 110 of the metal sheet 100, so as to be attached to the tab connecting section 110 after the tab connecting section 110 is welded to separate the aluminum-plastic film from the tab connecting section 110.

[0053] In this way, the tab lead-out sheet and battery device provided in the embodiments of the present application include a metal sheet 100 and a tab adhesive layer 200, wherein the metal sheet 100 is divided into a tab connection section 110, a glue section 120 and a pole connection section 130 in sequence along its own length direction, and the tab adhesive layer 200 is also divided into a first connection section 210 and a second connection section 220 along the length direction. The first connection section 210 and the glue section 120 are connected to prevent metal burrs generated after the tab connection section 110 is welded to the battery cell tab from piercing the aluminum-plastic film.

[0054] Moreover, the second connecting section 220 covers the tab connecting section 110, so that the second connecting section 220 is located on the side of the first connecting section 210 facing the tab connecting section 110, so that the presence of the second connecting section 220 eliminates the sharp corner of the first connecting section 210 facing the tab connecting section 110, thereby preventing the sharp corner from piercing the aluminum-plastic film.

[0055] At the same time, since the second connecting section 220 can be connected and attached to the tab connecting section 110 after the tab connecting section 110 is welded to the battery cell tab, the second connecting section 220 can be separated between the aluminum-plastic film and the tab connecting section 110, avoiding direct contact between the metal sheet 100 and the aluminum-plastic film, thereby preventing the aluminum-plastic film from adhering to the tab connecting section 110 during heat sealing, thereby avoiding subsequent detachment and damage of the aluminum-plastic film.

[0056] This effectively prevents the aluminum-plastic film from being damaged, thereby reducing the probability of short circuit and leakage of the existing battery device.

[0057] Furthermore, since the second connecting section 220 of the tab adhesive layer 200 is attached to the welded tab connecting section 110, there is no need to additionally apply solder joint protection glue to the second connecting section 220 of the tab adhesive layer 200. Instead, the tab adhesive layer 200 is used to ensure solder joint protection, resulting in a simpler and more compact structure. Furthermore, compared to solder joint protection glue, the tab adhesive layer 200 has higher toughness and strength, stably covering the entire welded portion of the tab connecting section 110, effectively improving the toughness, bending resistance, and vibration resistance of the welded portion, making it less susceptible to cracking.

[0058] In some embodiments, reference Figures 1 to 3As shown, two tab adhesive layers 200 are provided. The two tab adhesive layers 200 are respectively located on two opposite sides of the metal sheet 100 , and the first connecting sections 210 of the two tab adhesive layers 200 are connected to each other to cover the adhesive section 120 .

[0059] It can be understood that providing the tab adhesive layer 200 on both opposite sides of the metal sheet 100 to cover the adhesive section 120 can more effectively prevent the welding burrs of the tab connecting section 110 from piercing the aluminum-plastic film, provide better insulation protection for the battery device, and reduce the possibility of short circuit.

[0060] In addition, the two tab adhesive layers 200 are interconnected and cover the adhesive section 120, which helps to enhance the stability of the overall structure of the tab lead-out piece, making it more able to withstand external forces during battery assembly, transportation and use, and reducing short-circuit leakage problems caused by structural damage.

[0061] Further, refer to Figures 1 to 3 As shown, the tab connection section 110 and the adhesive section 120 have the same width;

[0062] The width of the first connecting section 210 is greater than the width of the adhesive section 120;

[0063] The width of the second connecting section 220 is greater than or equal to the width of the first connecting section 210 .

[0064] It can be understood that setting the tab connection section 110 and the adhesive section 120 to have the same width can make the metal sheet 100 structure smoother and also facilitate the subsequent tab adhesive layer 200 to cover the adhesive section 120 more stably and reliably.

[0065] Furthermore, the width of the first connecting segment 210 is greater than the width of the glue segment 120, and the width of the second connecting segment 220 is greater than or equal to the first connecting segment 210. After the tab connecting segment 110 is welded to the battery cell tab, the second connecting segment 220 can better cover the tab connecting segment 110, forming a more effective isolation layer between the aluminum-plastic film and the tab connecting segment 110, preventing the aluminum-plastic film from adhering to the tab connecting segment 110 during heat sealing, thereby avoiding subsequent detachment and damage of the aluminum-plastic film.

[0066] When implementing it, refer to Figures 1 to 3 As shown, the width difference between the first connecting section 210 and the adhesive section 120 is greater than or equal to 10 mm and less than or equal to 40 mm.

[0067] Such a setting can ensure that both sides of the first connecting section 210 along the length extension direction stably extend beyond the two side edges of the adhesive section 120, and the excess width L1 of one side edge ranges from 5mm to 20mm. In addition, during the heat sealing process of the aluminum-plastic film, it helps to evenly disperse the heat sealing pressure, so that the aluminum-plastic film and the tab adhesive layer 200 are better fitted, avoiding the problem of poor heat sealing caused by local uneven pressure, improving the heat sealing quality, and further preventing battery leakage.

[0068] For example, the excess width L1 of one side edge is set to 5 mm, 10 mm, 15 mm or 20 mm according to the specific width of the metal sheet 100 , which is not limited in the present application.

[0069] And, refer to Figures 1 to 3 As shown, the length of the second connecting segment 220 is greater than or equal to the length of the tab connecting segment 110 .

[0070] It can be understood that setting the length of the second connecting section 220 to be greater than or equal to the length of the tab connecting section 110 can ensure that the second connecting section 220 is stably and fully attached to the tab connecting section 110 and effectively isolate the tab connecting section 110 from the aluminum-plastic film.

[0071] In a specific implementation, the length difference between the second connecting segment 220 and the tab connecting segment 110 is greater than 0 mm and less than or equal to 20 mm.

[0072] This achieves more comprehensive coverage of the welding area of ​​the tab connection section 110, ensuring effective protection of the weld points. It also prevents the second connection section 220 from being too long, which would result in an overly lengthy overall structure of the tab lead-out plate. This ensures a compact structure, helps control costs, and improves production efficiency.

[0073] For example, the length L2 of the second connecting section 220 extending beyond the tab connecting section 110 can be set to 0 mm, 5 mm, 10 mm, 15 mm, or 20 mm according to the specific length of the metal sheet 100. This application does not impose any limitation on this.

[0074] Furthermore, in some embodiments, the thickness D1 of the first connecting segment 210 is greater than or equal to 50 μm and less than or equal to 200 μm.

[0075] Furthermore, a thickness D2 of the second connecting segment 220 is greater than or equal to 30 μm and less than or equal to 300 μm.

[0076] With this arrangement, the thickness of the first connecting section 210 and the second connecting section 220 of the tab adhesive layer 200 can meet the commonly used thickness range in the industry, which is convenient for processing and manufacturing and controls the material cost of the tab adhesive layer 200. In addition, while preventing burrs from piercing the second connecting section 220, the shape and toughness of the tab adhesive layer 200 are effectively maintained.

[0077] In a specific implementation, the first connecting segment 210 and / or the second connecting segment 220 is made of at least one of polypropylene, polyethylene, and polyethylene terephthalate.

[0078] It can be understood that by making the first connecting segment 210 and the second connecting segment 220 from at least one of polypropylene, polyethylene and polyethylene terephthalate, the tab adhesive layer 200 can have better insulation performance and thermal stability and be easier to process and shape.

[0079] The first connecting section 210 and the second connecting section 220 each include two outer layers and at least one core layer disposed between the two outer layers along their thickness direction.

[0080] It is easy to understand that setting the tab adhesive layer 200 to a multi-layer structure allows the tab adhesive layer 200 to integrate the characteristics of different materials and thus meet different functional requirements. It should be noted here that the melting point of at least one core layer should be higher than the melting point of the outer layer to prevent the core layer from further melting after the outer layer melts, thereby ensuring the stability of the tab lead-out sheet structure.

[0081] Furthermore, at least in the first connecting section 210 and the second connecting section 220 of the same tab adhesive layer 200 , the outer layers are made of the same material, the outer layers are made of a different material from the core layers, and the core layers are made of different materials.

[0082] For example, the tab adhesive layer 200 can be arranged to have various structures such as ABA, ABCA or ABCDA, wherein A is the outer layer, and B, C, and D can all be core layers.

[0083] The outer layer and core layer form a multi-layer protective barrier, which is more effective in preventing electrolyte erosion, water penetration, etc. Moreover, even if the outer layer is damaged to a certain extent, the core layer can still play a protective role, providing continuous protection for the tab lead-out sheet and extending the battery life.

[0084] In some embodiments, both the first connecting segment 210 and the second connecting segment 220 further comprise a modified material.

[0085] It can be understood that by adding modified materials into the first connecting segment 210 and the second connecting segment 220, the chemical stability of the first connecting segment 210 and the second connecting segment 220 can be further improved, so as to prevent the tab glue layer 200 from being corroded and damaged by the electrolyte, and can also effectively prevent the tab glue layer 200 from being oxidized and thus performance degradation.

[0086] At the same time, by adding modified materials, the toughness and strength of the first connecting segment 210 and the second connecting segment 220 can be effectively improved, so as to provide reliable protection for the metal sheet 100 through the tab adhesive layer 200 .

[0087] Exemplarily, the modified material includes at least one of maleic anhydride, diethyl maleate, dibutyl maleate, and maleic acid monoester, so as to have better chemical stability, toughness and structural strength.

[0088] Furthermore, the content of the modified material is greater than or equal to 0.5% and less than or equal to 5%.

[0089] It can be understood that setting the modified material content to 0.5%-5% can significantly improve the performance of the tab adhesive layer 200, and can avoid excessively high modified material content that affects the performance of the original material, thereby preventing the performance of the tab adhesive layer 200 from deteriorating.

[0090] Furthermore, in some embodiments, reference Figures 1 to 3 As shown, the tab lead-out sheet provided in the embodiment of the present application further includes an adhesive layer 300 , which is arranged on the side of the second connecting section 220 facing the tab connecting section 110 , and the second connecting section 220 is connected to the tab connecting section 110 via the adhesive layer 300 .

[0091] By providing the adhesive layer 300 , the second connecting section 220 and the tab connecting section 110 can be closely fitted together, thereby ensuring the reliability of the connection between the two.

[0092] The area of ​​the adhesive layer 300 is consistent with the area of ​​the second connecting section 220. In this way, the adhesive layer 300 can stably cover the second connecting section 220, and the connection between the second connecting section 220 and the tab connecting section 110 is more stable and reliable, avoiding the adhesive layer 300 partially covering the second connecting section 220, resulting in bubbles between the second connecting section 220 and the tab connecting section 110, which affects the performance of the tab lead sheet.

[0093] In some embodiments, the thickness D3 of the adhesive layer 300 is greater than or equal to 10 μm and less than or equal to 40 μm.

[0094] It can be understood that setting the thickness of the adhesive layer 300 to 10μm-40μm makes it easier for the total thickness of the adhesive layer 300 and the second connecting layer to match the thickness of the first connecting layer, thereby preventing the tab glue layer 200 and even the tab lead-out sheet from being locally too thick or too thin.

[0095] In a specific implementation, the adhesive layer 300 is a pressure-sensitive adhesive layer.

[0096] The adhesive layer 300 is set as a pressure-sensitive adhesive layer. No additional processing is required. Bonding can be achieved by simply applying pressure to the adhesive layer 300, making the mutual connection between the second connecting section 220 and the tab connecting section 110 more convenient and efficient, and highly repeatable. The bonding position can be repeatedly adjusted during bonding, thereby improving the yield rate.

[0097] The pressure-sensitive adhesive layer comprises at least one of acrylic acid and acrylate.

[0098] It can be understood that setting the pressure-sensitive adhesive layer to at least one of acrylic acid and acrylate can make the pressure-sensitive adhesive layer have better viscosity, ensure the stable connection between the tab connecting section 110 and the second connecting section 220, and make the physical and chemical properties of the pressure-sensitive adhesive layer stable, effectively ensuring the service life of the tab lead-out sheet.

[0099] The following describes the processing and use steps of the tab lead sheet:

[0100] S101: Processing of the tab rubber layer 200.

[0101] Among them, a multi-layer melt co-extrusion cast film forming process is used to process the polymer ear glue 200 material into a film.

[0102] S102: Processing the adhesive layer 300 .

[0103] The tab adhesive layer 200 is used as a base film, and the pressure-sensitive adhesive material is coated on the second connecting section 220 of the tab adhesive layer 200 by a coating machine using an intermittent coating process.

[0104] S103: preparing the tab adhesive layer 200.

[0105] The tab adhesive layer 200 is cut into a fixed size so that the edge of the tab adhesive layer 200 subsequently exceeds the edge of the adhesive section 120 and the second connecting section 220 .

[0106] S104: The metal sheet 100 is prepared.

[0107] The metal sheet 100 is cleaned, surface treated and chamfered.

[0108] S105: Glue the metal sheet 100.

[0109] The first connecting section 210 of the tab adhesive layer 200 and the adhesive section 120 of the metal sheet 100 are bonded together using a hot pressing process, and after curing, the tab lead-out piece is cut into a designed size to obtain a finished product.

[0110] S106: Welding of the tab lead.

[0111] The multi-layered cell tabs reserved in the cell are welded to the tab connection section 110 of the tab lead-out sheet. During welding, the second connection section 220 needs to be folded to avoid the high-temperature welding area.

[0112] S107: Laminating the adhesive layer 300.

[0113] The adhesive layer 300 area on the second connecting section 220 is laminated to the tab connecting section 110 and further laminated using a cold pressing or hot pressing process.

[0114] S108: The tab rubber layer 200 is heat-sealed and formed.

[0115] The electrode core with the tab connecting piece is placed in an aluminum-plastic film shell, and the first connecting section 210 of the tab adhesive layer 200 and the inner layer of the aluminum-plastic film are hot-pressed.

[0116] In addition, refer to Figures 1 to 3 As shown, the performance of the tab lead-out sheet is tested and compared through various specific embodiments:

[0117] First, the insulation test:

[0118] In Example 1, the metal sheet 100 has a total length of 45 mm and a width of 45.5 mm. The tab adhesive layer 200 has a width of 11.5 mm and a length of 51.6 mm. The width L1 of the first connecting segment 210 and the second connecting segment 220 of the tab adhesive layer 200 is 5 mm, and the length L2 of the second connecting segment 220 is 5 mm. The thickness D1 of the first connecting segment 210 is 100 μm, the thickness D2 of the second connecting segment 220 is 110 μm, and the thickness D3 of the adhesive layer 300 is 10 μm. The tab adhesive layer 200 has a single-layer structure and is made of polypropylene with a maleic anhydride content of 2% and a melting point of 141°C.

[0119] The difference between Example 2 and Example 1 is that the total thickness D1 of the first connecting section 210 is 150 μm, the thickness D2 of the second connecting section 220 is 160 μm, and the thickness D3 of the adhesive layer 300 is 10 μm.

[0120] The difference between Example 3 and Example 1 is that the thickness D2 of the second connecting section 220 is 120 μm, and the thickness D3 of the adhesive layer 300 is 20 μm.

[0121] The difference between Example 4 and Example 1 is that the total thickness D1 of the first connecting section 210 is 100 μm, the thickness D2 of the second connecting section 220 is 100 μm, and the thickness D3 of the adhesive layer 300 is 10 μm.

[0122] The difference between Example 5 and Example 1 is that the tab adhesive layer 200 is an ABA three-layer structure with a thickness ratio of 25:50:25, and the material of the core layer A is polypropylene with a melting point of 165°C.

[0123] The difference between Comparative Example 1 and Example 1 is that the tab adhesive layer 200 is only provided with the first connecting segment 210 , but not the second connecting segment 220 and the adhesive layer 300 , and a protective tape is attached to the welding point of the tab connecting segment 110 .

[0124] Verification revealed that the corrosion rates of the tab lead tabs at 45°C were 0.9% (Example 1), 0.01% (Example 2), 0.18% (Example 3), 1.0% (Example 4), 0.2% (Example 5), and 20.0% (Comparative Example 1). This indicates that attaching the tab connecting segment 110 with the second connecting segment 220 effectively reduces the incidence of forced corrosion on the tab lead tabs and improves their insulation performance.

[0125] Then add a test for the modified material:

[0126] No changes are made to Example 1.

[0127] The difference between Comparative Example 2 and Example 1 is that no modifying material is added.

[0128] The difference between Example 6 and Example 1 is that maleic anhydride is added in an amount of 0.2%.

[0129] The difference between Example 7 and Example 1 is that maleic anhydride is added in an amount of 0.5%.

[0130] The difference between Example 8 and Example 1 is that maleic anhydride is added in an amount of 1.0%.

[0131] The difference between Example 9 and Example 1 is that maleic anhydride is added in an amount of 4.0%.

[0132] The difference between Example 10 and Example 1 is that maleic anhydride is added in an amount of 5.0%.

[0133] The difference between Example 11 and Example 1 is that maleic anhydride is added in an amount of 6.0%.

[0134] The difference between Example 12 and Example 1 is that maleic acid monostearate is added in an amount of 1%.

[0135] It was verified that the initial peel strength (N / 15mm) was 0 (Comparative Example 1), 1 (Example 6), 11 (Example 7), 13 (Example 8), 17 (Example 9), 15 (Example 10), 12 (Example 11), and 14 (Example 12). After 28 days of resistance to an 85°C electrolyte environment, the peel strength (N / 15mm) was 0 (Comparative Example 1), 0 (Example 6), 2 (Example 7), 4 (Example 8), 7 (Example 9), 7 (Example 10), 6 (Example 11), and 5 (Example 12).

[0136] It can be seen that when the amount of modified material added is less than 0.5%, the initial peel strength and electrolyte peeling resistance of the tab adhesive layer 200 and the metal sheet 100 are relatively low. When the amount of modified material added is greater than 5%, the initial peel strength and electrolyte peeling resistance of the tab adhesive layer 200 and the metal sheet 100 are not significantly improved. Therefore, the amount of modified material added can be set to 0.5%-5%.

[0137] Finally, the bonding layer 300 thickness test:

[0138] No changes are made to Example 1.

[0139] The difference between Example 13 and Example 1 is that the thickness of the adhesive layer 300 is 5 μm.

[0140] The difference between Example 14 and Example 1 is that the thickness of the adhesive layer 300 is 20 μm.

[0141] The difference between Example 15 and Example 1 is that the thickness of the adhesive layer 300 is 30 μm.

[0142] The difference between Example 16 and Example 1 is that the thickness of the adhesive layer 300 is 40 μm.

[0143] The difference between Example 17 and Example 1 is that the thickness of the adhesive layer 300 is 50 μm.

[0144] Verified bonding strengths (N / 15mm) were 2.5 (Example 1), 1.5 (Example 13), 3.0 (Example 14), 3.0 (Example 15), 3.3 (Example 16), and 3.3 (Example 17). The corrosion rates of the tab connection section 110 at 45°C were 0.9% (Example 1), 1.5% (Example 13), 0.8% (Example 14), 0.8% (Example 15), 1.0% (Example 16), and 1.2% (Example 17). This indicates that a too thin adhesive layer 300 results in low bonding strength. However, a too thick adhesive layer 300 results in a thinner tab connection section 110 of the tab adhesive layer 200, weakening the protective capability and increasing the corrosion rate at the tab at 45°C. Therefore, setting the adhesive layer 300 thickness to 10μm-40μm exhibits better bonding and protective properties.

[0145] An embodiment of the present application further provides a battery device, comprising a battery device body and a tab lead-out piece according to any of the above embodiments, arranged on the battery device body.

[0146] The tab lead-out pieces have been described in detail in the above embodiments and will not be described again here.

[0147] Furthermore, an embodiment of the present application further provides an electrical device, comprising an electrical device body and a battery device disposed on the electrical device body.

[0148] The battery device and electrical equipment provided in the embodiments of the present application are provided with a tab lead-out sheet, which includes a metal sheet 100 and a tab adhesive layer 200, wherein the metal sheet 100 is divided into a tab connection section 110, a glue section 120 and a pole connection section 130 in sequence along its own length direction, and the tab adhesive layer 200 is also divided into a first connection section 210 and a second connection section 220 along the length direction.

[0149] The first connecting section 210 is connected to the glue section 120, and the second connecting section 220 covers the tab connecting section 110, so that the second connecting section 220 is located on the side of the first connecting section 210 facing the tab connecting section 110. The presence of the second connecting section 220 eliminates the sharp corner of the first connecting section 210 facing the tab connecting section 110, thereby preventing the sharp corner from piercing the aluminum-plastic film.

[0150] At the same time, since the second connecting section 220 can be connected and attached to the tab connecting section 110 after the tab connecting section 110 is welded to the battery cell tab, the second connecting section 220 can be interposed between the aluminum-plastic film and the tab connecting section 110. This prevents the aluminum-plastic film from adhering to the tab connecting section 110 during heat sealing, thereby preventing the aluminum-plastic film from being detached and damaged. This effectively prevents damage to the aluminum-plastic film and reduces the probability of short circuit leakage in existing battery devices.

[0151] It should be noted that references in this specification to "one embodiment," "an embodiment," "an exemplary embodiment," "some embodiments," and the like indicate that the described embodiment may include a particular feature, structure, or characteristic, but not necessarily every embodiment includes that particular feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not.

[0152] Generally speaking, terms should be understood, at least in part, based on the context in which they are used. For example, as used herein, the term "one or more" can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense, depending at least in part on the context. Similarly, terms such as "a," "an," or "the" can also be understood to convey either singular or plural usage, depending at least in part on the context.

[0153] It should be readily understood that “on,” “above,” and “over” in this application should be interpreted in the broadest manner, such that “on” means not only “directly on something,” but also includes “on something” with intervening features or layers therebetween, and “above” or “over” includes not only the meaning of “above” or “over,” but also includes “above” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0154] Additionally, spatially relative terms, such as "below," "beneath," "beneath," "above," and the like, may be used herein for ease of description to describe the relationship of one element or feature to other elements or features as depicted in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be otherwise oriented (rotated 90° or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0155] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tab lead-out plate, characterized in that: include: A metal sheet (100), wherein the metal sheet (100) comprises, in sequence along its length direction, a tab connection section (110), a glue section (120), and a pole connection section (130); The tab adhesive layer (200) includes a first connecting section (210) and a second connecting section (220) along the length direction of the metal sheet (100), wherein the first connecting section (210) is connected to the adhesive section (120), and the second connecting section (220) is located on the side of the tab connecting section (110), and the second connecting section (220) is configured to be connected to the tab connecting section (110) after the tab connecting section (110) is welded to the cell tab.

2. The tab lead-out piece according to claim 1, characterized in that: Two tab adhesive layers (200) are provided, the two tab adhesive layers (200) are respectively located on two opposite sides of the metal sheet (100), and the first connecting sections (210) of the two tab adhesive layers (200) are connected to each other to cover the adhesive section (120).

3. The tab lead-out piece according to claim 2, characterized in that: The tab connection section (110) and the adhesive section (120) have the same width; The width of the first connecting section (210) is greater than the width of the adhesive section (120); The width of the second connecting section (220) is greater than or equal to the width of the first connecting section (210).

4. The tab lead-out piece according to claim 3, characterized in that: The width difference between the first connecting section (210) and the adhesive section (120) is greater than or equal to 10 mm and less than or equal to 40 mm.

5. The tab lead-out piece according to claim 2, characterized in that: The length of the second connecting section (220) is greater than or equal to the length of the tab connecting section (110).

6. The tab lead-out piece according to claim 5, characterized in that: The length difference between the second connecting section (220) and the tab connecting section (110) is greater than 0 mm and less than or equal to 20 mm.

7. The tab lead-out piece according to claim 2, characterized in that: The thickness of the first connecting section (210) is greater than or equal to 50 μm and less than or equal to 200 μm.

8. The tab lead-out piece according to claim 2, characterized in that: The thickness of the second connecting section (220) is greater than or equal to 30 μm and less than or equal to 300 μm.

9. The tab lead-out piece according to any one of claims 1 to 8, characterized in that: The material of the first connecting section (210) and / or the second connecting section (220) includes at least one of polypropylene, polyethylene and polyethylene terephthalate.

10. The tab lead-out piece according to claim 9, characterized in that: The first connecting section (210) and the second connecting section (220) each comprise two outer layers and at least one core layer arranged between the two outer layers along their thickness direction.

11. The tab lead-out piece according to claim 10, characterized in that: At least in the first connecting section (210) and the second connecting section (220) of the same tab glue layer (200), the material of each outer layer is the same, the material of the outer layer is different from the material of the core layer, and the materials of each core layer are different.

12. The tab lead-out piece according to claim 9, characterized in that: The first connecting section (210) and the second connecting section (220) both further comprise a modified material.

13. The tab lead-out piece according to claim 12, characterized in that: The modified material includes at least one of maleic anhydride, diethyl maleate, dibutyl maleate, and maleic acid monoester.

14. The tab lead-out piece according to claim 12, characterized in that: The content of the modified material is greater than or equal to 0.5% and less than or equal to 5%.

15. The tab lead-out piece according to any one of claims 1 to 8, characterized in that: It also includes an adhesive layer (300), the adhesive layer (300) being arranged on a side of the second connecting section (220) facing the tab connecting section (110), and the second connecting section (220) being connected to the tab connecting section (110) via the adhesive layer (300).

16. The tab lead-out piece according to claim 15, characterized in that: The arrangement area of ​​the adhesive layer (300) is consistent with the area of ​​the second connecting section (220).

17. The tab lead-out piece according to claim 15, characterized in that: The thickness of the adhesive layer (300) is greater than or equal to 10 μm and less than or equal to 40 μm.

18. The tab lead-out piece according to claim 15, characterized in that: The adhesive layer (300) is a pressure-sensitive adhesive layer.

19. The tab lead-out piece according to claim 18, characterized in that: The material of the pressure-sensitive adhesive layer includes at least one of acrylic acid and acrylate.

20. A battery device, characterized in that: The invention comprises a battery device body and a tab lead-out piece as described in any one of claims 1 to 19 arranged on the battery device body.

21. An electrical device, characterized in that: The device comprises an electrical device body and a battery device as claimed in claim 20 arranged on the electrical device body.

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