Battery cell, battery pack, and electric device

Abstract

The application relates to the technical field of batteries, in particular to a battery monomer, a battery pack and a power utilization device. The application provides a battery monomer, which comprises a battery cell and insulating glue. The battery cell comprises a battery cell body and a tab part. The tab part has an adhesive surface. The adhesive surface has a connecting area and a welding mark area. The connecting area connects the battery cell body and the welding mark area. The insulating glue comprises a first part, a second part and a third part which are sequentially connected. The adhesion of the second part is smaller than that of the first part, and the adhesion of the second part is smaller than that of the third part. The first part is bonded to the battery cell body, the third part is bonded to the welding mark area, and the second part covers the connecting area. The application can reduce the tearing of the tab part caused by the pulling of the insulating glue.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery cell, a battery pack, and an electrical device. Background Technology

[0002] Each battery cell contains a cell and tabs extending from the cell. The tabs are welded to adapters or terminals. Because there may be incomplete or missing welds when welding the tabs to the adapters or terminals, the tabs may overlap with the cell due to incomplete or missing welds. Therefore, insulating glue is applied to the cell and the tabs. However, due to vibration and impact during cell assembly, the tabs are easily torn by the stretching of the insulating glue, which in turn affects the current carrying capacity of the tabs. Utility Model Content

[0003] This application provides a battery cell, a battery pack, and an electrical device that can reduce tearing of the tabs caused by the stretching of the insulating adhesive.

[0004] To achieve the above objectives, the main technical solutions adopted in this application include:

[0005] In a first aspect, embodiments of this application provide a battery cell, including a battery cell and insulating adhesive. The battery cell includes a battery cell body and a tab portion. The tab portion has an adhesive surface, and the adhesive surface has a connection area and a soldering area. The connection area connects the battery cell body and the soldering area. The insulating adhesive includes a first part, a second part, and a third part connected in sequence. The adhesiveness of the second part is less than that of the first part, and the adhesiveness of the second part is less than that of the third part. The first part is bonded to the battery cell body, the third part is bonded to the soldering area, and the second part covers the connection area.

[0006] The battery cell proposed in this application has a first part of insulating adhesive bonded to the cell body to protect it and reduce the probability of short circuits caused by the tabs being inserted backwards into the cell body and contacting the positive or negative electrode. A third part is bonded to the solder area to reduce solder slag accumulation between the tabs and the cell body, thereby reducing the risk of short circuits. A second part covers the connection area, supporting it and reducing the overlap between the tabs and the cell body. Furthermore, the second part has less adhesion than the first and third parts, so even under vibration and impact, the connection area experiences less tensile force from the second part, preventing tearing of the tabs and ensuring their current-carrying capacity.

[0007] Furthermore, the first, second, and third parts are connected sequentially. The second part, which has lower viscosity, covers the connection area, which can reduce the adhesion between the first and third parts, which have higher viscosity, thereby reducing tearing of the tab and ensuring the current flow capacity of the tab.

[0008] Secondly, embodiments of this application provide a battery pack comprising the battery cells described in any of the above embodiments.

[0009] The battery pack of this application includes battery cells, and a second part with less adhesion covers the connection area, which not only protects the connection area, but also reduces the adhesion between the first and third parts with higher adhesion, thereby reducing tearing of the tabs.

[0010] Thirdly, embodiments of this application provide an electrical device, including a single battery cell or a battery pack as described in any of the above embodiments.

[0011] The electrical equipment in this application includes the battery cell and battery pack described in any of the above embodiments, and therefore possesses the beneficial effects of the battery cell and battery pack described in any of the above embodiments. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of a single battery cell in this application;

[0014] Figure 2 for Figure 1 Enlarged view of region E in the middle;

[0015] Figure 3 This is a partial structural diagram of a single battery cell in this application;

[0016] Figure 4 for Figure 3 Enlarged view of region F in the middle;

[0017] Figure 5 This is a schematic diagram of the insulating adhesive in this application, wherein the insulating adhesive is in an unfolded state;

[0018] Figure 6 This is a partial structural diagram of a single battery cell in this application.

[0019] [Explanation of Labels in the Attached Image]

[0020] 1: Battery cell; 11: Battery cell body; 12: Terminal tab; 121: Connection area; 1211: Second edge; 1212: Fourth edge; 122: Soldering area;

[0021] 2: Insulating adhesive; 21: First part; 211: First sub-part; 22: Second part; 221: First edge; 222: Third edge; 223: First center line; 23: Third part; 231: Third sub-part;

[0022] 3: Strengthening Department;

[0023] 4: Shell; 41: First wall;

[0024] 5: Adapter plate;

[0025] 6: First weld mark; 61: First sub-weld mark; 62: Second sub-weld mark;

[0026] 7: Second solder mark;

[0027] A: The direction of extension of the far ear. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0030] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0031] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0032] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0033] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0034] A battery cell is the smallest charging and discharging unit. A battery cell consists of a positive electrode, a negative electrode, and a separator between them, formed by winding or stacking. The positive electrode includes a positive current collector and a positive active material. The positive current collector can be made of metals such as aluminum foil, nickel foil, or stainless steel, or a composite foil formed by combining metals and insulating materials. The positive active material includes the main positive active material, a conductive agent, and a binder. The main positive active material includes one or more of lithium-containing positive active materials such as lithium iron phosphate, ternary materials containing nickel, cobalt, and manganese, and lithium manganese iron phosphate. Similarly, the negative electrode includes a negative current collector and a negative active material. The negative current collector can be made of metals such as copper foil, aluminum foil, or stainless steel, or a composite foil formed by combining metals and insulating materials. The negative active material includes the main negative active material, a conductive agent, and a binder. The main negative active material includes one or more of the main negative active materials such as artificial graphite, natural graphite, silicon carbide, silicon oxide, and lithium titanate. The tab serves as the current output terminal of the battery cell, and it can be integrally connected to the positive or negative electrode plate or connected separately. The separator, as an insulating layer, prevents short circuits within the battery cell caused by contact between the positive and negative electrodes. Furthermore, as a semi-permeable layer, the separator prevents larger molecules from passing through while allowing smaller charged ions to pass. The base of the tab is the edge of the active material coating area of ​​the electrode plate.

[0035] Each battery cell contains a cell body and tabs extending from the cell body. These tabs are welded to adapters or terminals. After welding, insulating adhesive is applied to both the cell body and the tabs to reduce the risk of the tabs being inserted incorrectly into the cell. However, because the insulating adhesive may not completely adhere to the tabs, and due to vibrations and impacts during cell assembly, the tabs are prone to tearing due to the adhesive pulling, thus affecting their current-carrying capacity. Therefore, the method of applying the insulating adhesive needs to be improved to reduce the likelihood of the tabs tearing due to the adhesive pulling.

[0036] Firstly, reference Figure 1 and Figure 2 This application provides a battery cell comprising a cell 1 and an insulating adhesive 2. The cell 1 comprises a cell body 11 and a tab portion 12. The tab portion 12 has an adhesive surface, which has a connection area 121 and a solder area 122. The connection area 121 connects the cell body 11 and the solder area 122. The insulating adhesive 2 comprises a first part 21, a second part 22, and a third part 23 connected in sequence. The adhesiveness of the second part 22 is less than that of the first part 21, and the adhesiveness of the second part 22 is less than that of the third part 23. The first part 21 is bonded to the cell body 11, the third part 23 is bonded to the solder area 122, and the second part 22 covers the connection area 121.

[0037] The tab 12 extends from the cell body 11 and has an adhesive surface for attaching the insulating adhesive 2. A connection area 121 connects the cell body 11 and the soldering area 122, which is the area where the tab 12 is soldered to the terminal post or adapter piece 5. The first portion 21 of the insulating adhesive 2 is bonded to the cell body 11 to protect it and reduce the probability of a short circuit due to the tab 12 being inserted backwards into the cell body 11 and contacting the positive or negative electrode. The third portion 23 is bonded to the soldering area 122 to reduce solder slag accumulation between the tab 12 and the cell body 11, thereby reducing the risk of a short circuit in the cell 1. The second part 22 is covered on the connection area 121. The second part 22 can support the connection area 121, thereby reducing the bending of the tab 12 and the overlap with the cell body 11. In addition, the adhesion of the second part 22 is less than that of the first part 21 and the third part 23. Even when the cell 1 is subjected to vibration and impact, the connection area 121 is subjected to less pulling force by the second part 22, thereby preventing the tab 12 from tearing and ensuring the current carrying capacity of the tab 12.

[0038] The second part 22 covers the connection area 121. This can be along the extension direction of the fully unfolded tab 12, with the second part 22 completely covering the connection area 121. Alternatively, the second part 22 can not only completely cover the connection area 121 but also cover a portion of the cell body 11 and a portion of the solder area 122. The second part 22 may have low adhesion or no adhesion. It should be understood that adhesion can be expressed as bond strength. The insulating adhesive 2 may include a substrate and an adhesive layer disposed on the substrate, or it may consist only of an adhesive layer.

[0039] In this application, the first part 21, the second part 22 and the third part 23 are connected in sequence. The second part 22, which has lower viscosity, covers the connection area 121, which can reduce the adhesion between the first part 21 and the third part 23, which has higher viscosity, to the connection area 121, thereby reducing the tearing of the tab 12 and ensuring the flow capacity of the tab 12.

[0040] Optionally, refer to Figures 3 to 5 Along the extension direction A of the tab portion 12, the second portion 22 extends to the cell body 11 and has a first edge 221 connected to the first portion 21. The connection area 121 has a second edge 1211 connected to the cell body 11. Along the extension direction A of the tab portion 12, the first edge 221 and the second edge 1211 are spaced apart.

[0041] In this application, the extension direction A of the tab 12 is the length direction in which the tab 12 extends outward from the cell body 11 after it is fully unfolded. The extension direction of the insulating adhesive 2 is the length direction after it is fully unfolded, and the extension direction of the insulating adhesive 2 is the same as the extension direction A of the tab 12. (Refer to...) Figure 5 .

[0042] Along the extension direction A of the tab portion 12, the second portion 22 with lower viscosity not only covers the connection area 121, but also a portion of the cell body 11. The second portion 22 has a first edge 221 connected to the first portion 21. The first edge 221 is connected to the cell body 11. The distance between the first edge 221 and the second edge 1211 is the size of the second portion 22 covering the cell body 11. Controlling the distance between the first edge 221 and the second edge 1211 controls the distance between the first portion 21 with higher viscosity and the connection area 121, thereby reducing the tearing of the tab portion 12 caused by the pulling of the insulating adhesive 2.

[0043] Optionally, refer to Figure 4 and Figure 5 The dimension between the first edge 221 and the second edge 1211 is a, which satisfies: 0.05mm≤a≤6.5mm.

[0044] The dimension between the first edge 221 and the second edge 1211 cannot be too large. If the dimension between the first edge 221 and the second edge 1211 is too large, the size of the first part 21 bonded to the cell body 11 will be too small, resulting in insufficient bonding strength and the first part 21 will easily detach from the cell body 11. If 'a' is too small, there is a high risk that the adhesive of the first part 21 will flow into the connection area 121, especially when the temperature of the cell 1 rises during charging and discharging, the adhesive layer on the insulating adhesive 2 will melt and easily flow into the connection area 121, thereby increasing the risk of tearing the tabs.

[0045] The dimension 'a' between the first edge 221 and the second edge 1211 can be 0.05mm, 0.08mm, 0.1mm, 0.13mm, 0.15mm, 0.18mm, 0.2mm, 0.22mm, 0.25mm, 0.27mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, or 2.1mm. mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.7mm, 3.8mm, 4.0mm , 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5.0mm, 5.3mm, 5.6mm, 5.8mm, 6.0mm, 6.2mm, 6.3mm or 6.5mm, etc.

[0046] Optionally, refer to Figure 2 Along the extension direction A of the tab portion 12, the second portion 22 has a first edge 221 connected to the first portion 21, and the connection area 121 has a second edge 1211 connected to the cell body 11, with the first edge 221 and the second edge 1211 coinciding.

[0047] The overlap of the first edge 221 and the second edge 1211 indicates that the side of the second part 22 closest to the first part 21 completely covers the connection area 121. The bonding area between the first part 21 and the cell body 11 is sufficient to ensure sufficient bonding strength, thereby reducing the detachment of the first part 21 and improving the insulation performance between the tab 12 and the cell body 11. Furthermore, the complete coverage of the connection area 121 by the second part 22 can reduce the contact between the highly adhesive first part 21 and the tab, thereby reducing the tearing of the tab 12.

[0048] Optionally, refer to Figure 4 and Figure 5 Along the extension direction A of the tab 12, the second portion 22 extends to the solder area 122 and has a third edge 222 connected to the third portion 23. The connecting area 121 has a fourth edge 1212 connected to the solder area 122. Along the extension direction A of the tab 12, the third edge 222 and the fourth edge 1212 are spaced apart.

[0049] Along the extension direction A of the tab 12, the second part 22 with lower viscosity not only covers the connection area 121, but also a portion of the solder area 122. The second part 22 has a third edge 222 connected to the third part 23. The third edge 222 is connected to the solder area 122. The distance between the third edge 222 and the fourth edge 1212 is the size of the solder area 122 covered by the second part 22. Controlling the distance between the third edge 222 and the fourth edge 1212 controls the distance between the third part 23 with higher viscosity and the connection area 121, thereby reducing the tearing of the tab 12 caused by the pulling of the insulating adhesive 2.

[0050] Optionally, the dimension between the third edge 222 and the fourth edge 1212 is b, which satisfies: 0.05mm≤b≤6mm.

[0051] The size between the third edge 222 and the fourth edge 1212 should not be too large. If the size between the third edge 222 and the fourth edge 1212 is too large, the size of the third part 23 bonded to the solder area 122 will be too small. The third part 23 will not be able to fully cover the solder area 122, which may cause the solder slag of the solder area 122 to fall between the cell body 11 and the tab 12, thereby causing a short circuit.

[0052] The dimension 'a' between the first edge 221 and the second edge 1211 can be 0.05mm, 0.08mm, 0.1mm, 0.13mm, 0.15mm, 0.18mm, 0.2mm, 0.22mm, 0.25mm, 0.27mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, or 1.9mm. 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.7 mm, 3.8mm, 4.0mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5.0mm, 5.3mm, 5.6mm, 5.8mm or 6.0mm, etc.

[0053] Optionally, refer to Figure 2 Along the extension direction A of the tab portion 12, the second portion 22 has a third edge 222 connected to the third portion 23, and the connecting area 121 has a fourth edge 1212 connected to the solder area 122, with the third edge 222 coinciding with the fourth edge 1212.

[0054] The overlap of the third edge 222 and the fourth edge 1212 indicates that the side of the second part 22 closest to the third part 23 completely covers the connection area 121. The coverage area of ​​the third part 23 covering the solder area 122 is sufficient to reduce the slag shedding from the solder area 122 and improve the insulation performance between the tab 12 and the cell body 11. Furthermore, the complete coverage of the connection area 121 by the second part 22 can reduce the contact between the highly adhesive third part 23 and the tab 12, thereby reducing the tearing of the tab 12.

[0055] Optionally, along the extension direction A of the tab 12, the dimension of the third part 23 is c, and the dimension of the solder area 122 is d, satisfying: 0.2mm≤d / c≤1.25mm.

[0056] When the third edge 222 coincides with the fourth edge 1212, the edge of the third part 23 away from the second part 22 can fall exactly on the edge of the solder area 122 away from the connection area 121, or the edge of the third part 23 away from the second part 22 can fall between the edge of the solder area 122 and the edge of the end of the tab 12. The third part 23 can completely cover the solder area 122, reduce the slag shedding from the solder area 122, and improve the insulation performance between the tab 12 and the cell body 11. When there is a gap between the third edge 222 and the fourth edge 1212, the second part 22 covers a portion of the solder area 122. The edge of the third part 23 away from the second part 22 can fall exactly on the edge of the solder area 122 away from the connection area 121, or the edge of the third part 23 away from the second part 22 can fall between the edge of the solder area 122 and the edge of the end of the tab 12, as long as the insulating adhesive 2 can completely cover the solder area 122, reduce the slag shedding from the solder area 122, and improve the insulation performance between the tab 12 and the cell body 11. In this application, the edge of the third part 23 away from the second part 22 can be selected to fall on the edge of the solder area 122 or between the solder area 122 and the end of the tab 12, depending on specific needs.

[0057] The values ​​of d / c can be 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1.0, 1.05, 1.10, 1.15, 1.20, 1.23, or 1.25, etc. Along the extending direction A of the tab 12, the dimension c of the third part 23 can be 1mm, 1.5mm, 1.7mm, 2.0mm, 2.3mm, 2.5mm, 2.8mm, 2.9mm, 3.0mm, 3.5mm, 3.7mm, 3.8mm, 4.0mm, 4.5mm, 5.0mm, 5.6mm, 5.8mm, 6.0mm, 6.5mm, 6.8mm, 7.0mm, 7.5mm, 8.0mm, 8.5mm, 9.0mm, 9.3mm, 9.5mm, 9.8mm, 10mm, 10.5mm, 11mm, 11.2mm, 11.6mm, or 12mm, etc.

[0058] Along the extending direction A of the tab portion 12, the size d of the solder area 122 can be 2.0mm, 2.3mm, 2.5mm, 2.8mm, 2.9mm, 3.0mm, 3.5mm, 3.7mm, 3.8mm, 4.0mm, 4.5mm, 5.0mm, 5.6mm, 5.8mm, 6.0mm, 6.5mm, 6.8mm, 7.0mm, 7.5mm, 8.0mm, 8.5mm, 9.0mm, 9.3mm, 9 0.5mm, 9.8mm, 10mm, 10.5mm, 11mm, 11.2mm, 11.6mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm, 14.5mm, 15mm, 15.5mm, 16mm, 16.5mm, 17mm, 17.5mm, 18mm, 18.5mm, 19mm, 19.5mm, 20mm, 20.5mm, 21mm, 21.5mm or 22mm, etc.

[0059] Optionally, refer to Figure 2 The thickness of the first part 21 is e, which satisfies: 0.01mm≤e≤0.3mm; the thickness of the second part 22 is f, which satisfies: 0.005mm≤f≤0.2mm; and the thickness of the third part 23 is g, which satisfies: 0.01mm≤g≤0.3mm.

[0060] The greater the thickness of the first part 21, the better the bonding strength between the first part 21 and the cell body 11, thereby reducing the need for the tab 12 to be inserted backwards into the cell body 11 and thus reducing the risk of short circuits. However, the thickness of the first part 21 cannot be too thick. If the thickness of the first part 21 is too thick, the adhesive in the first part 21 will overflow into the second area, thereby increasing the bonding strength between the second area and the connection area 121. When the cell 1 is subjected to vibration and impact, the tab 12 is prone to tearing. The thickness of the first part 21 cannot be too thin either, as this will result in insufficient bonding strength between the first part 21 and the cell body 11.

[0061] The greater the thickness of the third part 23, the better the bonding strength between the third part 23 and the solder area 122, which can reduce the amount of solder slag falling between the tab 12 and the cell body 11, thereby reducing the risk of short circuit. However, the thickness of the third part 23 cannot be too thick. If the thickness of the third part 23 is too thick, the adhesive of the third part 23 will overflow into the second area, thereby increasing the bonding strength between the second area and the connection area 121. When the cell 1 is subjected to vibration and impact, the tab 12 is prone to tearing. The thickness of the third part 23 cannot be too thin either. If it is too thin, the bonding strength between the third part 23 and the solder area 122 will be insufficient, making it easy to fall off. This will cause the solder slag from the solder area 122 to fall between the tab 12 and the cell body 11, thereby causing a short circuit.

[0062] The thickness e of the first part 21 can be 0.01mm, 0.012mm, 0.015mm, 0.016mm, 0.018mm, 0.02mm, 0.022mm, 0.024mm, 0.026mm, 0.027mm, 0.028mm, 0.03mm, 0.035mm, 0.040mm, 0.045mm, 0.050mm, 0.055mm, or 0.0 60mm, 0.065mm, 0.070mm, 0.075mm, 0.080mm, 0.085mm, 0.090mm, 0.095mm, 0.1mm, 0.12mm, 0.15mm, 0.17mm, 0.19mm, 0.20mm, 0.22mm, 0.23mm, 0.25mm, 0.27mm, 0.28mm, 0.29mm, or 0.30mm, etc.

[0063] The thickness f of the second part 22 can be 0.005mm, 0.008mm, 0.01mm, 0.012mm, 0.015mm, 0.016mm, 0.018mm, 0.02mm, 0.022mm, 0.024mm, 0.026mm, 0.027mm, 0.028mm, 0.03mm, 0.035mm, 0.040mm, 0.045mm, 0.050mm, 0.055mm, 0.060mm, 0.065mm, 0.070mm, 0.075mm, 0.080mm, 0.085mm, 0.090mm, 0.095mm, 0.1mm, 0.12mm, 0.15mm, 0.17mm, 0.19mm, or 0.20mm, etc.

[0064] The thickness g of part 23 can be 0.01mm, 0.012mm, 0.015mm, 0.016mm, 0.018mm, 0.02mm, 0.022mm, 0.024mm, 0.026mm, 0.027mm, 0.028mm, 0.03mm, 0.035mm, 0.040mm, 0.045mm, 0.050mm, 0.055mm, 0.06mm. 0mm, 0.065mm, 0.070mm, 0.075mm, 0.080mm, 0.085mm, 0.090mm, 0.095mm, 0.1mm, 0.12mm, 0.15mm, 0.17mm, 0.19mm, 0.20mm, 0.22mm, 0.23mm, 0.25mm, 0.27mm, 0.28mm, 0.29mm, or 0.30mm, etc.

[0065] Optionally, the tab 12 has a plurality of reinforcing parts 3 for improving the structural strength of the tab 12.

[0066] The reinforcing part 3 can improve the strength of the tab 12, and when the cell 1 is subjected to vibration and impact, it can reduce the tearing of the tab 12 caused by the stretching of the insulating glue 2.

[0067] Optionally, the reinforcing part 3 is constructed as a raised structure or a recessed structure, and the shape of the raised structure or the recessed structure is elongated, circular or elliptical.

[0068] The raised and recessed structures can be embossed structures formed on the tab 12 by stamping or other methods. They can be long strip-shaped reinforcing ribs, or circular or elliptical embossed structures. Of course, the reinforcing part 3 can also be other uneven textures formed on the tab 12 by stamping or other methods. The structural form of the reinforcing part 3 can be selected according to the actual situation.

[0069] Optionally, refer to Figure 3 and Figure 6 The battery cell also includes a housing 4 and an adapter plate 5. The housing 4 has a first wall 41. The cell body 11 is disposed inside the housing 4. The adapter plate 5 is disposed between the cell body 11 and the first wall 41. The tab portion 12 includes multiple tabs. The multiple tabs are welded to form a first solder mark 6. The first solder mark 6 includes a first sub-solder mark 61 and a second sub-solder mark 62. The first sub-solder mark 61 is welded to the adapter plate 5 to form a second solder mark 7. The second solder mark 7 is disposed in the solder mark area 122. The second part 22 covers part of the second sub-solder mark 62.

[0070] Multiple tabs are pre-welded to form a first weld mark 6, which enhances the strength of the tab portion 12. The adapter piece 5 is welded to the tab portion 12 with the first sub-weld mark 61 of the first weld mark 6 to form a second weld mark 7. In other words, the weld mark area 122 of the tab portion 12 is welded to the adapter piece 5 to form the second weld mark 7. That is, the area of ​​the first weld mark 6 covers the entire weld mark area 122, reducing damage to the tab portion 12 caused by excessive welding energy during welding of the tab portion 12 and the adapter piece 5. Furthermore, since the second weld mark 7 after welding the tab portion 12 and the adapter piece 5 exerts a tensile force on the tab portion 12, it is prone to damage. The second sub-weld mark 62 can also enhance the strength of the tab portion 12, thereby reducing tearing of the tab portion 12. The second part 22 covers part of the second sub-weld mark 62, that is, part of the connection area 121 has the second sub-weld mark 62, enhancing the strength of the connection area 121, thereby reducing tearing of the tab portion 12.

[0071] Optionally, refer to Figure 5 The first part 21 includes multiple first subparts 211, which are spaced apart; the third part 23 includes multiple third subparts 231, which are spaced apart.

[0072] Multiple first sub-parts 211 can be spaced apart along the length of the insulating adhesive 2, or along the width of the insulating adhesive 2, or in other possible ways, to ensure the connection strength between the first sub-parts 21 and the battery cell body 11 while reducing the amount of adhesive used. The arrangement of multiple third sub-parts 231 can also be determined according to specific needs, as long as the connection strength between the third sub-parts 23 and the solder mark is ensured to reduce the falling of solder slag from the solder mark area 122.

[0073] Optionally, the first sub-part 211 is constructed as a strip structure or a circular structure; the third sub-part 231 is constructed as a strip structure or a circular structure.

[0074] While ensuring the bonding strength between the first part 21 and the cell body 11 and the bonding strength between the third part 23 and the solder area 122, the shapes of the first sub-part 211 and the third sub-part 231 can be determined according to the specific circumstances.

[0075] Optionally, along the extending direction A of the tab 12, the second portion 22 has a first center line 223, and along the direction toward the first center line 223, the viscosity of the second portion 22 gradually decreases.

[0076] Along the extension direction A of the tab 12, the second part 22 extends from the side near the first part 21 to the first center line 223 of the second part 22, and the second part 22 extends from the side near the third part 23 to the first center line 223 of the second part 22. The adhesiveness of the second part 22 varies, and the adhesiveness is minimal near the first center line 223 to reduce tearing of the tab 12.

[0077] Secondly, embodiments of this application provide a battery pack comprising the battery cells described in any of the above embodiments.

[0078] The battery pack of this application includes battery cells. A second portion 22 with lower adhesion covers the connection area 121, which not only protects the connection area 121 but also reduces the adhesion between the first portion 21 and the third portion 23 with higher adhesion to the connection area 121, thereby reducing tearing of the tab portion 12. The third portion 23 is bonded to the solder area 122 to reduce solder slag laps between the tab and the cell body 11, thereby reducing the risk of short circuit in the cell 1. The first portion 21 of the insulating adhesive is bonded to the cell body 11 to protect the cell body 11 and reduce the probability of short circuit due to the tab being inserted backward into the cell body 11 and contacting the positive or negative electrode.

[0079] Thirdly, embodiments of this application provide an electrical device, including a single battery cell or a battery pack as described in any of the above embodiments.

[0080] The electrical equipment in this application includes the battery cell and battery pack described in any of the above embodiments, and therefore possesses the beneficial effects of the battery cell and battery pack described in any of the above embodiments.

[0081] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0082] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0083] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

[0084] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cell, characterized in that, include: A battery cell includes a cell body and a tab portion, the tab portion having an adhesive surface, the adhesive surface having a connection area and a solder area, the connection area connecting the cell body and the solder area; The insulating adhesive includes a first part, a second part, and a third part connected in sequence. The second part has less adhesiveness than the first part, and the second part has less adhesiveness than the third part. The first part is bonded to the battery cell body, the third part is bonded to the soldering area, and the second part covers the connection area.

2. The battery cell according to claim 1, characterized in that, Along the extending direction of the tab portion, the second portion extends to the cell body and has a first edge connected to the first portion, the connection area has a second edge connected to the cell body, and along the extending direction of the tab portion, the first edge and the second edge are spaced apart.

3. The battery cell according to claim 2, characterized in that, The dimension between the first edge and the second edge is 'a', which satisfies: 0.05mm ≤ a ≤ 6.5mm.

4. The battery cell according to claim 1, characterized in that, Along the extending direction of the tab portion, the second portion has a first edge connected to the first portion, and the connection area has a second edge connected to the cell body, wherein the first edge coincides with the second edge.

5. The battery cell according to claim 1, characterized in that, Along the extending direction of the tab portion, the second portion extends to the solder area and has a third edge connected to the third portion, the connecting area has a fourth edge connected to the solder area, and along the extending direction of the tab portion, the third edge and the fourth edge are spaced apart.

6. The battery cell according to claim 5, characterized in that, The dimension between the third edge and the fourth edge is b, which satisfies: 0.05mm≤b≤6mm.

7. The battery cell according to claim 1, characterized in that, Along the extending direction of the tab portion, the second portion has a third edge connected to the third portion, and the connecting area has a fourth edge connected to the solder area, wherein the third edge coincides with the fourth edge.

8. The battery cell according to claim 1, characterized in that, Along the extending direction of the tab, the dimension of the third part is c, and the dimension of the solder area is d, satisfying: 0.2mm≤d / c≤1.25mm.

9. The battery cell according to claim 1, characterized in that, The thickness of the first part is e, which satisfies: 0.01mm≤e≤0.3mm; the thickness of the second part is f, which satisfies: 0.005mm≤f≤0.2mm; and the thickness of the third part is g, which satisfies: 0.01mm≤g≤0.3mm.

10. The battery cell according to claim 1, characterized in that, The electrode lug has multiple reinforcing parts to enhance its structural strength.

11. The battery cell according to claim 10, characterized in that, The reinforcing part is constructed as a raised structure or a recessed structure, and the shape of the raised structure or the recessed structure is elongated, circular or elliptical.

12. The battery cell according to claim 1, characterized in that, It also includes a housing and an adapter plate, the housing having a first wall, the battery cell body being disposed inside the housing, and the adapter plate being disposed between the battery cell body and the first wall; The electrode portion includes multiple electrodes, which are welded together to form a first solder mark. The first solder mark includes a first sub-solder mark and a second sub-solder mark. The first sub-solder mark is welded to the adapter piece to form a second solder mark. The second solder mark is located in the solder mark area, and the second portion covers a portion of the second sub-solder mark.

13. The battery cell according to claim 1, characterized in that, The first part includes a plurality of first sub-parts, which are spaced apart; the third part includes a plurality of third sub-parts, which are spaced apart.

14. The battery cell according to claim 13, characterized in that, The first sub-part is constructed as a strip-shaped structure or a circular structure; the third sub-part is constructed as a strip-shaped structure or a circular structure.

15. The battery cell according to claim 1, characterized in that, Along the extending direction of the tab portion, the second portion has a first center line, and along the direction toward the first center line, the viscosity of the second portion gradually decreases.

16. A battery pack, characterized in that, Includes the battery cell according to any one of claims 1-15.

17. An electrical appliance, characterized in that, Includes the battery cell of any one of claims 1-15 or the battery pack of claim 16.

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