Tab glue, tab assembly, battery and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a tab film, a tab assembly, a battery and electric equipment, the tab film comprises a tab film body, the tab film body comprises a main body area and a thinning area, the main body area is connected with the thinning area, the thickness H of the thinning area is smaller than the thickness L of the main body area, and the thickness L of the thinning area is smaller than the thickness L of the main body area. The tab film body is provided with an exposed end and a packaging end along the width direction of the tab film body, and the corners of the packaging end are provided with the thinning areas; the thickness of the corner of the packaging end of the tab film body is effectively reduced, so that the hardness of the corner of the packaging end of the tab film body is relatively small, and after a battery is packaged, the risk that the packaging end of the tab film body possibly pierces an aluminum plastic film due to over-high hardness is effectively avoided, so that the condition that the aluminum plastic film is damaged or corroded is effectively prevented, and the service life of the aluminum plastic film is prolonged. And the safety and the reliability of the battery are improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of batteries, specifically relating to tab adhesive, tab assembly, battery and electrical equipment. Background Technology

[0002] Lithium-ion batteries, as a new type of rechargeable battery, have advantages such as high energy density and power density, high operating voltage, light weight, small size, long cycle life, good safety, and environmental friendliness. They have broad application prospects in portable electrical appliances, power tools, large-scale energy storage, and electric transportation power supplies.

[0003] In existing technologies, the packaging process of pouch cells relies on the fusion of the aluminum-plastic film with the polypropylene layer after heating. Particularly in the area where the aluminum-plastic film connects to the tabs, this process is achieved by heating the polypropylene layer of the aluminum-plastic film and the tab adhesive at the tab location, fusing them together. However, for cells with high energy storage or high energy density, if the tab adhesive is too thick, the sharp corners of the adhesive may puncture the aluminum-plastic film after packaging. This increases the risk of damage or corrosion to the aluminum-plastic film at the corresponding location. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of the existing technology by providing a tab adhesive, a tab assembly, a battery, and an electrical device, which solves the technical problem that the sharp corners of the tab adhesive may puncture the aluminum-plastic film after encapsulation due to the tab adhesive being too thick or the polypropylene layer of the aluminum-plastic film being too thin.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides an electrode adhesive, comprising an electrode adhesive body, the electrode adhesive body comprising a main body region and a thinning region, the main body region and the thinning region being connected, the thickness H of the thinning region being less than the thickness L of the main body region, and along the width direction of the electrode adhesive body, the electrode adhesive body having an exposed end and a packaged end, the thinning region being provided at the corner of the packaged end.

[0007] In some embodiments, the thickness H of the thinning region gradually decreases from the main region to the thinning region.

[0008] In some embodiments, the thickness H of the thinned region satisfies the relationship: 30μm≤H<100μm;

[0009] And / or, the thickness L of the main body region satisfies the relationship: 100μm≤L≤1000μm.

[0010] In some embodiments, in the thickness direction of the tab adhesive body, the area M of the orthographic projection of the thinned region and the area S of the orthographic projection of the tab adhesive body satisfy the relationship: M:S = 1:(8~10).

[0011] In some embodiments, the thinning region is provided at the corner of the exposed end.

[0012] In some embodiments, in the thickness direction of the tab adhesive body, the orthographic projection of the thinning region has at least one first edge line, the first edge line and the edge of the corner where the thinning region is located enclose the orthographic projection of the thinning region, wherein the first edge line is a straight line or a curve.

[0013] In some embodiments, the thinned region is provided with rounded corners.

[0014] Secondly, this utility model provides a tab assembly, including a tab body and tab adhesive of any of the above embodiments, wherein the tab adhesive is disposed on opposite sides of the tab body, and the encapsulation end of the tab adhesive faces the connection end between the tab body and the battery cell.

[0015] Thirdly, this utility model provides a battery, including an aluminum-plastic film, a battery cell, and a tab assembly as described in the above embodiments. The aluminum-plastic film has a receiving cavity, the battery cell is disposed in the receiving cavity, a top seal is provided on the aluminum-plastic film, one end of the tab body is connected to the battery cell, the other end of the tab body extends through the top seal to the outside of the aluminum-plastic film, and the tab adhesive is disposed between the top seal and the tab body.

[0016] Fourthly, this utility model provides an electrical device, including the battery described in the above embodiments.

[0017] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:

[0018] The tab adhesive of this invention, by setting a tab adhesive body, has a thinned area H that is less than the thickness L of the main body area of ​​the tab adhesive body. Along the width direction of the tab adhesive body, the tab adhesive body has an exposed end and a sealed end. The corners of the sealed end are provided with thinned areas, which effectively reduces the thickness of the corners of the sealed end of the tab adhesive body, making the corners of the sealed end of the tab adhesive body less hard. After the battery is sealed, the risk of the sealed end of the tab adhesive body puncturing the aluminum-plastic film due to excessive hardness is effectively avoided, thereby effectively preventing the aluminum-plastic film from being damaged or corroded, and thus improving the safety and reliability of the battery.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the battery of this utility model.

[0022] Figure 2 This is a schematic diagram of the structure of the tab adhesive of this utility model.

[0023] Figure 3 This is a cross-sectional view of the tab adhesive of this utility model.

[0024] Figure 4 This is another cross-sectional view of the tab adhesive of this utility model.

[0025] Figure 5 This is another structural schematic diagram of the tab adhesive of this utility model.

[0026] Figure 6 This is another structural schematic diagram of the tab adhesive of this utility model.

[0027] The reference numerals in the attached figures are explained as follows:

[0028] 100. Battery;

[0029] 10. Electrode assembly; 11. Electrode adhesive; 111. Main body area; 112. Thinning area; 1121. First edge line; 113. Exposed end; 114. Encapsulation end; 115. Rounded corner; 12. Electrode body;

[0030] 20. Battery cells;

[0031] 30. Aluminum-plastic film;

[0032] a) Width direction of the tab adhesive body; b) Thickness direction of the tab adhesive body. Detailed Implementation

[0033] If certain terms are used in the specification and claims to refer to specific components, those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" as used throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to." "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error.

[0034] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be interpreted as indicating or implying relative importance.

[0035] In this invention, 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, the character " / " in this invention generally indicates that the preceding and following related objects have an "or" relationship.

[0036] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] The following will be combined with the appendix Figures 1-6 The technical solutions in the embodiments of this utility model are clearly and completely described. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0038] The electrical equipment of this utility model embodiment includes a battery 100. The electrical equipment can be automobiles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Automobiles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application embodiment does not impose any special limitations on the above-mentioned electrical equipment.

[0039] Please see Figures 1-6 The battery 100 of this utility model embodiment includes an aluminum-plastic film 30, a battery cell 20, and a tab assembly 10. The aluminum-plastic film 30 has a receiving cavity, the battery cell 20 is disposed in the receiving cavity, and a top seal is provided on the aluminum-plastic film 30. One end of the tab assembly 10 is connected to the battery cell 20, and the other end of the tab assembly 10 extends through the top seal to the outside of the aluminum-plastic film 30.

[0040] The aluminum-plastic film 30 includes a first encapsulation film and a second encapsulation film. The first encapsulation film has a groove. The first encapsulation film and the second encapsulation film are connected to each other and form a receiving cavity at the groove. The receiving cavity is used to accommodate the battery cell 20, electrolyte and part of the tab assembly 10. The edges of the first encapsulation film and the second encapsulation film are connected to form a top seal and a side seal.

[0041] Both the first and second encapsulation films include an encapsulation layer, a metal layer, and a protective layer stacked together. The encapsulation layer is disposed close to the battery cell 20, while the protective layer is disposed away from the battery cell 20.

[0042] It is understandable that the top seal and side seal are the parts that are sealed by hot pressing after the aluminum-plastic film 30 contains the electrode assembly and electrolyte.

[0043] Please see Figure 1 The tab assembly 10 of this utility model embodiment includes a tab body 12 and a tab adhesive 11, with the tab adhesive 11 disposed on opposite side surfaces of the tab body 12. One end of the tab body 12 is connected to the battery cell 20, and the other end of the tab body 12 extends through the top seal to the outside of the aluminum-plastic film 30. The tab adhesive 11 is disposed between the top seal and the tab body 12.

[0044] Please see Figures 1-6The tab adhesive 11 of this utility model embodiment includes a tab adhesive body, which includes a main body region 111 and a thinning region 112. The main body region 111 and the thinning region 112 are connected. The thickness H of the thinning region 112 is less than the thickness L of the main body region 111. Along the width direction a of the tab adhesive body, the tab adhesive body has an exposed end 113 and a sealing end 114. The corner of the sealing end 114 is provided with the thinning region 112. The sealing end 113 of the tab adhesive body is the part of the tab adhesive 11 located inside the aluminum-plastic film 30 when the battery 100 is sealed, and the exposed end 114 is the part of the tab adhesive 11 located outside the aluminum-plastic film 30 when the battery 100 is sealed.

[0045] Compared with the prior art, the tab adhesive 11 of this utility model embodiment, by setting a tab adhesive body, has a thickness H of the thinned area 112 of the tab adhesive body that is less than the thickness L of the main body area 111 of the tab adhesive body. Along the width direction a of the tab adhesive body, the tab adhesive body has an exposed end 113 and a packaged end 114. The corners of the packaged end 114 are provided with thinned areas 112, which effectively reduces the thickness of the corners of the packaged end 114 of the tab adhesive body, making the corners of the packaged end 114 of the tab adhesive body less hard. After the battery 100 is packaged, the risk of the packaged end 114 of the tab adhesive body puncturing the aluminum-plastic film 30 due to excessive hardness is effectively avoided, thereby effectively preventing the aluminum-plastic film 30 from being damaged or corroded, and thus improving the safety and reliability of the battery 100.

[0046] It is understandable that after the battery 100 is packaged, the packaging end 114 of the tab adhesive 11 faces the connection end between the tab body 12 and the cell 20, that is, the packaging end 114 of the tab adhesive 11 is located on the side of the tab adhesive 11 closer to the cell 20.

[0047] Understandably, during the battery 100 encapsulation process, the side of the tab adhesive 11 located inside the battery 100 is more susceptible to stress concentration. Due to the various mechanical and chemical stresses present inside the cell 20, these stresses may converge at sharp corners, leading to increased local stress. When the stress exceeds the tensile strength of the aluminum-plastic film 30, puncture will occur. Therefore, when the thinning area 112 is located at the corner of the encapsulation end 114, the thinning area 112 is located on the side of the tab adhesive 11 closer to the cell 20, effectively avoiding the risk that the encapsulation end 114 of the tab adhesive body might puncture the aluminum-plastic film 30 due to excessive hardness.

[0048] Please see Figures 5-6In some embodiments, thinning regions 112 are provided at the corners of the exposed end 113. Since the encapsulated end 114 of the tab adhesive 10 needs to face the connection end between the tab body 12 and the battery cell 20 when installing the tab adhesive 10, the thinning region 112 is located on the side of the tab adhesive 10 closest to the battery cell 20. This reduces the efficiency and accuracy of tab adhesive 10 installation. Therefore, by providing thinning regions 112 at both the corners of the exposed end 113 and the corners of the encapsulated end 114, the tab adhesive 10 can effectively adapt to different installation requirements more flexibly, without worrying about installation problems caused by incorrect orientation. This design improves the efficiency and accuracy of tab adhesive 10 installation. It effectively saves time in confirming the orientation of the tab adhesive 10, thus allowing for faster installation. Simultaneously, by reducing the possibility of reinstallation due to incorrect orientation, this design also improves installation accuracy and reduces quality risks caused by operational errors.

[0049] Please see Figure 4 In some embodiments, the thickness H of the thinning region 112 gradually decreases from the main body region 111 to the thinning region 112. By setting the thickness H of the thinning region 112 and the thickness F of the second corner region 1122, the thickness H of the thinning region 112 gradually decreases from the main body region 111 to the thinning region 112, effectively reducing the hardness of the thinning region 112, thereby reducing the risk of puncturing the aluminum-plastic film 30 due to excessive hardness of the thinning region 112 during the encapsulation process.

[0050] Furthermore, as the thickness H of the thinning region 112 gradually decreases, the tab adhesive 11 can better adapt to the curved and uneven areas of the aluminum-plastic film 30 during the encapsulation process. This adaptability helps ensure a good fit and seal between the tab adhesive 11 and the aluminum-plastic film 30. Good fit and seal effectively prevent electrolyte leakage and intrusion of external substances, thereby improving the safety and reliability of the battery 100.

[0051] Please see Figure 3 In some embodiments, the thickness H of the thinned region 112 satisfies the relationship: 30μm≤H<100μm; and / or, the thickness L of the main region 111 satisfies the relationship: 100μm≤H≤1000μm.

[0052] The thickness H of the thinning region 112 is set, and it cannot be too large or too small. When the thickness H of the thinning region 112 is too large, i.e., H ≥ 100 μm, the thickness H of the thinning region 112 will be equal to or greater than the thickness L of the main region 111. This results in the thickness H of the thinning region 112 not being reduced, and the thinning region 112 being too hard, which may cause it to puncture the aluminum-plastic film 30 during the encapsulation process. When the thickness H of the thinning region 112 is too small, i.e., H < 30 μm, the structural strength of the thinning region 112 will be significantly reduced. In this case, the thinning region 112 may not be able to withstand the mechanical stress during the encapsulation process and is prone to deformation or even cracking. Such deformation or cracking will not only affect the appearance quality of the battery 100, but may also damage the internal sealing of the battery 100, leading to leakage and reducing the safety of the battery 100. Therefore, the thickness H of the thinned region 112 is set to satisfy the relationship: 30μm≤H<100μm. This effectively ensures that the thinned region 112 maintains sufficient structural strength to cope with various mechanical stresses during the packaging process, while avoiding excessive rigidity caused by excessive thickness.

[0053] The thickness L of the main body region 111 must be neither too large nor too small. If the thickness L is too large (L > 1000 μm), it increases the amount of material used in the tab adhesive 11, thus increasing the production cost and overall weight of the battery 100 and reducing its energy density. Simultaneously, a large thickness L increases the difficulty of battery encapsulation, potentially leading to incomplete encapsulation and poor sealing, thereby reducing the battery's safety and reliability. Conversely, if the thickness L is too small (L < 100 μm), the structural strength of the main body region 111 is low, potentially causing it to be unable to withstand the mechanical stress during encapsulation and easily deforming or even cracking. This, in turn, affects the sealing performance of the battery 100, leading to leakage and further reducing its safety and reliability. Therefore, the thickness L of the main body region 111 is determined to satisfy the relationship: 100μm≤H≤1000μm. Within this thickness range, the material used for the tab adhesive 11 is reasonably controlled, avoiding unnecessary waste while ensuring the stability and lightweight requirements of the battery 100 structure. The moderate thickness makes the encapsulation process smoother, effectively achieving complete sealing of the battery 100, preventing the intrusion of external moisture, dust, and other impurities, as well as leakage of internal electrolyte, thus effectively improving the safety and reliability of the battery 100.

[0054] Furthermore, the thickness H of the thinned region 112 is 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, or 99 μm. However, it is not limited to the listed values; other values ​​within the range are also applicable.

[0055] The thickness L of the main body region 111 is 100μm, 200μm, 300μm, 400μm, 500μm, 600μm, 700μm, 800μm, 900μm or 1000μm. However, it is not limited to the listed values, and other values ​​within the range are also applicable.

[0056] In some embodiments, the area M of the orthographic projection of the thinning region 112 and the area S of the orthographic projection of the tab adhesive body in the thickness direction b of the tab adhesive body satisfy the relationship: M:S = 1:(8~10).

[0057] By setting the area M of the orthographic projection of the thinning region 112, and ensuring that the orthographic projection area M of the thinning region 112 and the orthographic projection area S of the tab adhesive body satisfy the relationship M:S = 1:(8~10), the proportion of the thinning region 112 in the tab adhesive body can be effectively controlled. This design ensures that reducing the thickness H of the thinning region 112 will not significantly affect the overall thickness of the tab adhesive 11, thus ensuring that the performance of the tab adhesive 11 is not affected. At the same time, after the thickness of the thinning region 112 is reduced, the hardness also decreases, avoiding the risk of puncturing the aluminum-plastic film 30 due to excessive hardness.

[0058] In some embodiments, in the thickness direction b of the tab adhesive body, the orthographic projection of the thinning region 112 has at least one first edge line 1121. The first edge line 1121 and the edge of the corner where the thinning region 112 is located enclose the orthographic projection of the thinning region 112, wherein the first edge line 1121 is a straight line or a curve. By setting the first edge line 1121, the orthographic projection of the thinning region 112 is formed by the first edge line 1121 and the edge of the corner where the thinning region 112 is located, effectively defining the range of the thinning region 112. After the battery 100 is encapsulated, the risk that the encapsulation end 114 of the tab adhesive body may puncture the aluminum-plastic film 30 due to excessive hardness is effectively avoided. At the same time, the first edge line 1121 being a straight line or a curve effectively provides diverse design possibilities for the thinning region 112, and the shape of the first edge line 1121 can be selected according to actual needs.

[0059] Please see Figure 6In some embodiments, the thinned region 112 is provided with rounded corners 115. By providing rounded corners 115, the sharpness of the thinned region 112 is effectively reduced, thereby preventing the thinned region 112 and the second corner region 1122 from piercing the aluminum-plastic film 30.

[0060] In some embodiments, the radius of the fillet 115 is 1–5 mm. By setting the radius of the fillet 115 to 1–5 mm, the sharpness of the thinned region 112 and the second corner region 1122 can be effectively reduced within this range. Furthermore, an excessively large radius of the fillet 115 may reduce the contact area between the thinned region 112 and the second corner region 1122 and the aluminum-plastic film 30, thereby affecting the sealing effect of the battery 100 encapsulation.

[0061] Furthermore, the radius of the 115 fillet is 1mm, 1.2mm, 1.5mm, 2mm, 2.3mm, 2.8mm, 3mm, 3.5mm, 3.6mm, 4mm, 4.1mm, 4.9mm, or 5mm. However, it is not limited to the listed values; other values ​​within the range also apply.

[0062] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A type of tab adhesive, characterized in that: The device includes a tab adhesive body, which includes a main body region (111) and a thinning region (112). The main body region (111) and the thinning region (112) are connected. The thickness H of the thinning region (112) is less than the thickness L of the main body region (111). Along the width direction (a) of the tab adhesive body, the tab adhesive body has an exposed end (113) and a packaged end (114). The thinning region (112) is provided at the corner of the packaged end.

2. The tab adhesive as described in claim 1, characterized in that: The thickness H of the thinning region (112) gradually decreases from the main region (111) to the thinning region (112).

3. The tab adhesive as described in claim 1, characterized in that: The thickness H of the thinned region (112) satisfies the following relationship: 30μm≤H<100μm; And / or, the thickness L of the main region (111) satisfies the relationship: 100μm≤L≤1000μm.

4. The tab adhesive as described in claim 1, characterized in that: In the thickness direction (b) of the tab adhesive body, the area M of the orthographic projection of the thinning region (112) and the area S of the orthographic projection of the tab adhesive body satisfy the relationship: M:S=1:(8~10).

5. The tab adhesive as described in claim 1, characterized in that: The exposed end (113) has a thinning region (112) at its corner.

6. The tab adhesive as described in any one of claims 1 to 5, characterized in that: In the thickness direction (b) of the tab adhesive body, the orthographic projection of the thinning region (112) has at least one first edge line (1121), the first edge line (1121) and the edge of the corner where the thinning region (112) is located enclose the orthographic projection of the thinning region (112), wherein the first edge line (1121) is a straight line or a curve.

7. The tab adhesive as described in any one of claims 1 to 5, characterized in that: The thinned area (112) is provided with rounded corners (115).

8. A tab assembly, characterized in that: Includes a tab body (12) and a tab adhesive as described in any one of claims 1 to 7, wherein the tab adhesive (11) is disposed on opposite sides of the tab body (12), and the encapsulation end of the tab adhesive (11) faces the connection end between the tab body (12) and the battery cell (20).

9. A battery, characterized in that: The assembly includes an aluminum-plastic film (30), a battery cell (20), and a tab assembly (10) as described in claim 8. The aluminum-plastic film (30) has a receiving cavity, the battery cell (20) is disposed in the receiving cavity, a top sealing portion is provided on the aluminum-plastic film (30), one end of the tab body (12) is connected to the battery cell (20), the other end of the tab body (12) extends through the top sealing portion to the outside of the aluminum-plastic film (30), and the tab adhesive (11) is disposed between the top sealing portion and the tab body (12).

10. An electrical appliance, characterized in that: Includes the battery as described in claim 9.

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