Battery tab and battery

Abstract

The battery pole lug comprises a pole lug conducting layer and pole lug glue, packaging parts are arranged on the same two sides of the front face and the back face of the pole lug conducting layer, the pole lug glue is attached to the corresponding positions of the front face and the back face of the pole lug conducting layer respectively, and the pole lug glue is attached to the outer surfaces of the packaging parts. The thickness of the packaging part is smaller than that of the tab conducting layer, and the width of the packaging part is larger than that of the chamfers on the two sides of the tab conducting layer. According to the utility model, the packaging part is additionally arranged, the thickness of the packaging part is smaller than that of the tab conducting layer, and the width of the packaging part is larger than that of the chamfers at the two sides of the tab conducting layer, so that a space for gradually reducing the thickness of the packaging part can be provided; according to the invention, the thickness of the packaging part is thinner than that of the chamfer under the condition that the overcurrent of the battery tab is not reduced, and when the tab glue and the aluminum plastic film are matched for packaging, the tab glue can fully fill the spaces on the two sides of the tab in the thickness direction after being fused, so that the battery tab is ensured not to leak after being packaged.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy battery technical field, especially a kind of battery tab and battery. BACKGROUND

[0002] Battery tab is an important component or raw material of lithium ion polymer battery product.It refers to the metal conductor that is led out from the positive and negative electrode of battery, that is, the contact point of the positive and negative electrode of battery when charging and discharging.

[0003] In prior art, the structure of battery tab is that one layer of tab adhesive is compounded on the two sides of metal conductor, wherein the metal conductor is used for transmitting electron, and the tab adhesive is used for preventing short circuit between metal strip and aluminum plastic film, and after being compounded with aluminum plastic film outer packaging material, it can prevent electrolyte leakage.The quality of battery tab is one of important factors to determine the performance of battery, on the one hand, the thickness and material of battery tab determine the size of resistance, too thin tab will increase resistance, which cannot meet the overcurrent requirement of large capacity lithium ion battery, and affect the performance of battery, on the other hand, too thick battery tab will increase the internal resistance of battery, affect the cycle life of battery, and it is difficult to be packaged with aluminum plastic film.For example, soft package lithium ion battery has capacity greater than or equal to 200Ah, and the performance of odds ratio is 3 to 5C, the existing 0.3-0.4mm thick battery tab cannot meet the overcurrent requirement, when the thickness of battery tab is increased to 0.6-1.2mm, although it can meet the overcurrent requirement, but such thick battery tab cannot fill the space on both sides of battery tab after tab adhesive melts, and the packaged battery is prone to leakage.

[0004] Therefore, the present application aims to provide a novel battery tab and battery, to solve the above problems. UTILITY MODEL CONTENTS

[0005] The main purpose of the utility model is to provide a battery tab and battery, to solve the technical problem that the tab adhesive is not enough to fill the space in the thickness direction of battery tab on both sides after melting when the existing thick battery tab is packaged with aluminum plastic film, and further lead to battery leakage.

[0006] In order to realize the above utility model purpose, the utility model provides a battery tab, which comprises tab conductive layer and tab adhesive, the opposite sides of tab conductive layer are provided with packaging part, the tab adhesive is respectively attached to the corresponding positions of front and back of tab conductive layer, and the tab adhesive is attached to the outer surface of packaging part, wherein the height of the surface of packaging part attached with tab adhesive is lower than the height of the surface of tab conductive layer attached with tab adhesive.

[0007] Further, the packaging part is provided with at least one step.

[0008] Further, the step is rectangular step or trapezoidal step.

[0009] Further, the surface of the packaging portion is arranged obliquely away from the side of the tab conductive layer.

[0010] Further, the height of the packaging portion and the tab adhesive portion decreases gradually.

[0011] Further, the tab adhesive includes a first adhesive segment adhering to the front or back of the tab conductive layer, a second adhesive segment adhering to the outer surface of the packaging portion, and a third adhesive segment extending to the outside of the packaging portion, and the first adhesive segment, the second adhesive segment and the third adhesive segment are connected in sequence.

[0012] Further, the first adhesive segment includes a first adhesive area and a first laminated area, the second adhesive segment includes a second adhesive area and a second laminated area, and the first laminated area and the second adhesive area are at least partially laminated, and the second laminated area and the third adhesive segment are at least partially laminated.

[0013] In order to achieve the above-mentioned utility model purposes, the second aspect of the utility model provides a battery, which comprises two battery tabs, a shell and a core body, the core body is arranged in the shell, and two battery tabs are arranged on the shell, and one end of each of the two battery tabs is connected with the core body through a current collector.

[0014] Further, the shell is further provided with a sealing portion, and the sealing portion is arranged correspondingly to the battery tab.

[0015] Beneficial effects:

[0016] Compared with the prior art, the battery tab provided by the embodiment of the application comprises a tab conductive layer and a tab adhesive, the same two sides of the front and back of the tab conductive layer are provided with a packaging portion, the tab adhesive is adhered to the positions corresponding to the front and back of the tab conductive layer respectively, the outer surface of the packaging portion is adhered to the tab adhesive, the thickness of the packaging portion is less than the thickness of the tab conductive layer, and the width of the packaging portion is greater than the width of the chamfer on the two sides of the tab conductive layer. According to the technical scheme, the same two sides of the front and back of the battery tab are additionally provided with a packaging portion, the thickness of the packaging portion is less than the thickness of the tab conductive layer, that is, the tab body is widened, then the positions on the two sides of the tab after being widened are thinned, and the width of the packaging portion is greater than the width of the chamfer on the two sides of the tab conductive layer, so that a space in which the thickness of the packaging portion gradually decreases can be provided. Compared with the chamfering mode, the thickness of the packaging portion is thinner than the chamfering mode without reducing the overcurrent of the battery tab. When the tab adhesive and the aluminum plastic film are packaged, the tab adhesive can fill the space in the thickness direction of the two sides of the tab after being melted, so that the battery tab does not leak after being packaged.

[0017] Compared with the prior art, the battery of the embodiment of the application comprises the battery tab as described in any of the above. It can be understood that the battery of the application can comprise all the technical features and technical effects of the battery tab described above, and will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Fig. 1 is a perspective structural schematic view of a battery tab according to an embodiment of the application;

[0019] Figure 2 Fig. 2 is a perspective structural schematic view of a tab adhesive according to an embodiment of the application;

[0020] Figure 3 Fig. 3 is a schematic view of battery explosion according to an embodiment of the application;

[0021] Figure 4 Fig. 4 is a partial schematic view of a battery tab packaging state according to an embodiment of the application.

[0022] Wherein:

[0023] 1. battery tab; 10, tab conductive layer; 100, packaging portion; 11, tab adhesive; 110, first bonding section; 1100, first bonding area; 1101, first lamination area; 111, second bonding section; 1110, second bonding area; 1111, second lamination area; 112, third bonding section;

[0024] 2. housing; 20, sealing portion;

[0025] 3. core;

[0026] 4. current collector.

[0027] The realization, functional features and advantages of the application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0028] It should be understood that the specific embodiments described herein are merely intended to explain the application, and are not intended to limit the application.

[0029] In the description of the utility model, it is necessary to understand that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is the orientation or positional relationship shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features.In the description of the utility model, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0030] In the description of the utility model, it should be explained that, unless otherwise specifically defined and limited, the terms "mounting", "connection" and "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication between two elements or the interaction relationship between two elements.For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0031] In the utility model, unless otherwise specifically defined and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them.In addition, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature.The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0032] The battery tab is an important component or raw material of lithium ion polymer battery product.It refers to the metal conductor that leads out the positive and negative poles from the battery cell, that is, the contact point of the positive and negative poles of the battery during charging and discharging.

[0033] At present, the structure of the battery tab is that a metal conductor is coated with a layer of tab adhesive on both sides, wherein the metal conductor is used for transmitting electrons, and the tab adhesive is used to prevent short circuit between the metal strip and the aluminum plastic film, and can prevent electrolyte leakage after being combined with the aluminum plastic film packaging material. The quality of the battery tab is one of the important factors that determine the performance of the battery. On the one hand, the thickness and material of the battery tab determine the size of the resistance. Too thin tab will increase the resistance, which cannot meet the overcurrent requirement of large capacity lithium ion battery, and affect the performance of the battery. On the other hand, too thick battery tab will increase the internal resistance of the battery, affect the cycle life of the battery, and is difficult to be packaged with the aluminum plastic film. For example, the soft package lithium ion battery has a capacity greater than or equal to 200 Ah, and the performance at 3 to 5 C is 3 to 5 C. The existing 0.3-0.4 mm thick battery tab cannot meet the overcurrent requirement. When the thickness of the battery tab is increased to 0.6-1.2 mm, although it can meet the overcurrent requirement, the battery tab with such thickness cannot be packaged with the aluminum plastic film. After the tab adhesive melts, the space on both sides of the tab cannot be filled, and the packaged battery is prone to leakage.

[0034] The inventor found that in the design process of the battery tab, the existing battery tab is usually designed with a chamfer on both sides of the metal layer of the battery tab to reduce the thickness of the metal layer on both sides, so as to seal the battery tab with the sealing part of the aluminum plastic film. However, the method of setting chamfers on both sides of the metal layer of the battery tab has serious defects. In actual application, when the battery tab cannot meet the overcurrent requirement and the thickness of the battery tab needs to be increased, due to the angle limitation of the chamfer, the thickness of the chamfer part is relatively small compared to the overall thickness of the battery tab. Overall, the thickness of the chamfer part is still large. If the chamfer is increased, it is easy to cause the chamfer part to expand to the main part of the battery tab, thereby reducing the overcurrent. Therefore, the relatively thick tab is packaged with the aluminum plastic film. After the tab adhesive melts, the space in the thickness direction on both sides of the battery tab is not enough to be filled, and there is still a serious leakage problem.

[0035] In order to completely solve the technical problem that the space in the thickness direction of the two sides of the thick battery tab cannot be filled after the tab glue melts when the thick battery tab is packaged with the aluminum plastic film, and then the battery leaks, the application embodiment provides a battery tab, and the technical scheme of the application provides an additional packaging part, the thickness of the packaging part is less than the thickness of the tab conductive layer, and the width of the packaging part is greater than the width of the two side chamfers of the tab conductive layer, so that a space with gradually decreasing thickness of the packaging part can be provided. Compared with the chamfering method, the thickness of the packaging part is thinner than the chamfering, and when the tab glue and the aluminum plastic film are packaged, the space in the thickness direction of the two sides of the tab can be filled after the tab glue melts, so that the battery tab does not leak after being packaged. The hanger mechanism in the application embodiment will be described in detail below with reference to the accompanying drawings.

[0036] Please refer to Figures 1 to 4 , Figure 1 It is a three-dimensional structure schematic diagram of the battery tab 1 of an embodiment of the utility model; Figure 2 It is a three-dimensional structure schematic diagram of the tab glue 11 of an embodiment of the utility model; Figure 3 It is a battery explosion schematic diagram of an embodiment of the utility model; Figure 4 It is a partial schematic diagram of the packaging state of the battery tab 1 of an embodiment of the utility model. In this embodiment, a battery tab 1 is provided, which comprises a tab conductive layer 10 and a tab glue 11, the tab conductive layer 10 is provided with a packaging part 100 on the same two sides of the front and back surfaces, the tab glue 11 is respectively attached to the corresponding positions of the front and back surfaces of the tab conductive layer 10, the tab glue 11 is attached to the outer surface of the packaging part 100, the thickness H1 of the packaging part 100 is less than the thickness H2 of the tab conductive layer 10, and the width of the packaging part 100 is greater than the width of the two side chamfers of the tab conductive layer 10.

[0037] In this embodiment, the tab conductive layer 10 is mainly responsible for leading the current in the battery to the external circuit, and plays a role in connecting the inside and outside of the battery monomer; the tab glue 11 is used for packaging the tab. The tab glue 11 is attached to the front and back surfaces of the tab conductive layer 10 and the packaging part 100, so as to form a sealing layer, and after the battery tab 1 is packaged with the shell 2, the internal substances (such as electrolyte) of the battery can be prevented from leaking out through the gap between the tab and the shell 2. At the same time, the tab glue 11 can also provide certain insulation performance to ensure the safety of the current in the transmission process. Specifically, the battery can be a soft package battery. The shell can be an aluminum plastic film.

[0038] In the above embodiment, the front and back of the tab conductive layer 10 are provided with the packaging part 100 on both sides, compared with the chamfer on both sides of the front and back, the packaging part 100 provided on both sides of the application has a width greater than the width of the chamfer on both sides of the tab conductive layer 10, when the thickness of the battery tab 1 increases, the packaging part 100 can expand outward, compared with the chamfer, it can avoid the expansion to the inside of the tab body, which leads to the reduction of the flow area, and ensure that the tab adhesive 11 can completely cover the packaging part 100 and tightly fit with it, avoid the gap or weak point at the edge of the packaging part 100, and further improve the sealing and reliability of the packaging.

[0039] It should be noted that the chamfer is used to provide a size reference for the design of the packaging part 100; the front and back of the tab conductive layer 10 in the application refer to the two working surfaces opposite to each other and can be directly observed, and the two surfaces are in a relative position in space (i.e., when the front is upward, the back is downward), one surface faces the observer, and the other surface faces away from the observer.

[0040] In the above embodiment, the front and back of the tab conductive layer 10 are provided with the packaging part 100 on both sides, compared with the chamfer on both sides of the front and back, the packaging part 100 provided on both sides of the application has a width greater than the width of the chamfer on both sides of the tab conductive layer 10, when the thickness of the battery tab 1 increases, the packaging part 100 can expand outward, compared with the chamfer, it can avoid the expansion to the inside of the tab body, which leads to the reduction of the flow area, and ensure that the tab adhesive 11 can completely cover the packaging part 100 and tightly fit with it, avoid the gap or weak point at the edge of the packaging part 100, and further improve the sealing and reliability of the packaging.

[0041] Please refer to Figures 1 to 4 In an embodiment, the packaging part 100 is provided with at least one step. The step is a rectangular step or a trapezoidal step.

[0042] In this embodiment, the packaging portion 100 is a step. It can be understood that the step is arranged on both sides of the tab conductive layer 10, the top surface of the step is lower than the front surface or the back surface of the tab conductive layer 10, and the tab adhesive 11 is pasted on the top surface. When the tab is heat sealed by the heat sealing portion, the entire step can be directly filled, preventing the soft-packaged battery from leaking. Further, the step is a multi-layer step. When the tab adhesive 11 is pasted together with the tab conductive layer 10, the step can have a small difference with the step, thereby realizing that the tab adhesive 11 can fully fill the packaging space, without affecting the overcurrent, to solve the problem of leakage of the relatively thick tab packaging.

[0043] Further, the step of the present application is a rectangular step or a trapezoidal step. When the step is a rectangular step, the rectangular step has the characteristics of straight edges and right angles, which makes it more stable in structure. When subjected to external forces, the rectangular step can more effectively resist deformation and damage, thereby protecting the overall structure of the tab from being affected. In addition, the shape of the rectangular step is relatively simple, so it is easier to achieve during processing. This helps to reduce production costs, improve production efficiency, and reduce quality problems caused by processing difficulties. At the same time, the right-angle edges of the rectangular step can form a more intimate contact with the tab adhesive 11, which helps to improve the sealing of the packaging. This intimate contact can reduce the risk of leakage of electrolyte and other battery internal substances, ensuring the safety and stability of the battery. When the step is a trapezoidal step, the inclined surface design of the trapezoidal step helps to disperse stress and reduce the occurrence of stress concentration. During the charging and discharging process of the battery, the tab will be affected by the thermal stress and mechanical stress generated by the current. The trapezoidal step can more effectively disperse these stresses to the entire packaging portion 100, thereby reducing the risk of tab damage.

[0044] It can be understood that although the inclined surface of the trapezoidal step may not form as intimate a contact with the tab adhesive 11 as the rectangular step, the inclined surface of the trapezoidal step can also increase the contact area between the tab adhesive 11 and the packaging portion 100, thereby further improving the sealing of the packaging.

[0045] It should be noted that in the technical solution of the present application, when the packaging portion 100 is a step, the number, height and shape of the step are not specifically limited in the present application, and the packaging portion 100 can meet different packaging needs and scenarios. The present application preferably uses a rectangular step or a trapezoidal step.

[0046] Please refer to Figures 1 to 4 In an embodiment, the surface of the packaging portion 100 is inclined on the side away from the tab conductive layer 10.

[0047] In the embodiment, the fitting surface of the packaging portion 100 is a bevel, which can further increase the contact area between the tab adhesive 11 and the packaging portion 100, thereby further improving the sealing performance of the packaging. Meanwhile, the bevel gradually decreases in thickness from the front surface or the back surface of the tab, so that the length of the bevel in the direction of the thickness decrease can be changed by adjusting the slope of the bevel, and the gap can be reduced, thereby realizing that the tab adhesive 11 can sufficiently fill the packaging space, and the problem of liquid leakage of the relatively thick tab can be solved without affecting overcurrent.

[0048] Further, the height of the packaging portion 100 and the tab adhesive 11 gradually decreases.

[0049] It can be understood that, in the technical solution of the application, the packaging portion 100 only needs to satisfy that the thickness is less than the thickness of the tab conductive layer 10 and the width is greater than the width of the chamfer on both sides of the tab conductive layer 10, and the problem of liquid leakage of the relatively thick tab can be solved. When the fitting surface of the packaging portion 100 and the tab adhesive 11 is a height-decreasing surface, the gap of the packaging portion 100 can be reduced, and the application does not specifically limit the fitting surface of the packaging portion 100 and the tab. Therefore, the fitting surface of the packaging portion 100 and the tab adhesive 11 in the application can be an irregular height-decreasing surface.

[0050] Please refer to Figures 1 to 4 In an embodiment, the packaging portion 100 arranged at different positions of the tab conductive layer 10 is of the same structure or a combination of different structures.

[0051] It can be understood that the working surface of the battery tab 1 has a front surface and a back surface, and in the embodiment, the packaging portion 100 is arranged on the same side of the front surface and the back surface of the tab conductor, and therefore, the packaging portion 100 is distributed at four positions of the battery tab 1. As known from the above, the packaging portion 100 can be a step, a bevel, or even an irregular height-decreasing surface. Therefore, the four packaging portions 100 distributed at different positions of the battery tab 1 in the application can be of the same structure, partially the same structure, or a combination of different structures, and the application does not specifically limit this. For example, the packaging portion 100 at the four positions can all be of the same step structure, the same bevel structure, or the same irregular surface structure; the packaging portion 100 at the four positions can also be of the same structure at at least two positions, for example, two of them are of the step structure, and the other two are of the regular bevel structure or the irregular bevel structure.

[0052] It should be noted that, considering the cost, the application preferably adopts the same structure design for the packaging portion 100 at the four positions.

[0053] Please refer to Figures 1 to 4In an embodiment, the tab adhesive 11 comprises a first bonding section 110 bonded to the front or back of the conductive layer 10 of the tab, a second bonding section 111 bonded to the outer surface of the encapsulation part 100, and a third bonding section 112 extending outwardly from the encapsulation part 100. The first bonding section 110, the second bonding section 111, and the third bonding section 112 are connected in sequence. The first bonding section 110 comprises a first bonding area 1100 and a first laminated area 1101, the second bonding section 111 comprises a second bonding area 1110 and a second laminated area 1111, and the first laminated area 1101 and the second bonding area 1110 are at least partially laminated, and the second laminated area 1111 and the third bonding section 112 are at least partially laminated.

[0054] In the embodiment, the first bonding section 110 is used to bond the front or back of the battery tab 1, the second bonding section 111 is used to bond the face of the encapsulation part 100, and the third bonding section 112 is used to connect the second bonding section 111 to form a closed encapsulation structure. Specifically, the first bonding section 110 and the second bonding section 111 are laminated and bonded through the first laminated area, and the second bonding section 111 is laminated and bonded through the second laminated area 1111.

[0055] In the above embodiment, for ease of understanding, the encapsulation part 100 of the application is a rectangular step. In the manufacturing of the battery tab 1, first, steps are processed on both sides of the front and back of the battery tab 1, and then the front is bonded and the back is bonded. The process is as follows: when the step is one layer, first, the second bonding section 111 is bonded to the step, and the thickness of the second bonding section 111 is the same as the step face to the front or back of the battery tab 1, and the thicknesses of the first bonding section 110, the second bonding section 111, and the third bonding section 112 are the same, which facilitates processing. After the second bonding section 111 is bonded to the step, the second laminated area 1111 of the second bonding section 111 extends out of the step face. Then, the first bonding section 110 is bonded to the front of the battery tab 1, and the first laminated area 1101 of the first bonding section 110 extends out of the front of the battery tab 1 and is laminated and bonded with the second bonding section 111 of the second bonding section 111. Then, the same operation is performed on the back. Finally, the third bonding section 112 is bonded with the second laminated area 1111 extending out of the step face on both sides to realize the manufacturing of the battery tab 1 of the technical solution of the application.

[0056] It can be understood that when the step is a multi-layer step, the bonding mode of the tab adhesive 11 is similar.

[0057] Further, in an embodiment, the first bonding section 110, the second bonding section 111 and the third bonding section 112 are integrally formed. It can be understood that the first bonding section 110, the second bonding section 111 and the third bonding section 112 are integrally formed in the manufacturing process, without the need for separate processing and assembly. The application to the production of the battery tab 1 does not need to be segmented and bonded, greatly simplifying the production process, reducing the steps and time in the production process.

[0058] Referring to Figures 1 to 4 In an embodiment, the application provides a battery comprising two battery tabs 1 as described in any of the above, a shell 2 and a core 3, the core 3 is arranged in the shell 2, and the two battery tabs 1 are arranged on the shell 2, and one end of the two battery tabs 1 is connected to the core through the current collector 4.

[0059] In this embodiment, the battery tab 1 is used to connect with the external circuit and the internal core 3, and the core 3 is connected through the current collector 4. The current collector 4 is in contact with the active material of the core 3 in the battery, and is used to connect with the battery tab 1, and plays a role of collecting and conducting current. That is, the current collector 4 uniformly distributes and leads out the current generated inside the core to the battery tab 1, ensuring the effective transmission of current and the normal operation of the battery. The shell 2 is used as the outer packaging material of the battery, mainly playing the role of protecting the core and isolating the external environment. The core 3 is a core stack or a core, which is used to provide electric energy.

[0060] It should be noted that the two battery tabs 1 of the application are not specifically limited in the setting position of the battery, and can be located at opposite ends of the battery, at the same end, or at adjacent ends.

[0061] Referring to Figures 1 to 4 In an embodiment, the shell 2 is further provided with a sealing part 20, and the sealing part 20 is arranged corresponding to the battery tab 1.

[0062] In this embodiment, the sealing part 20 on the shell 2 and the heat sealing part on the device for packaging the battery tab 1 are arranged corresponding to the part of the battery tab 1 that needs to be packaged. The sealing part 20 can cover the battery tab 1 and the connecting part of the battery tab 1 and the core 3, providing an additional layer of protection to prevent the tab from being physically damaged or contaminated during transportation, installation or use. And the sealing part 20 and the heat sealing part are arranged opposite to the position of the battery tab 1 that needs to be packaged, that is, the shape is the same, for example, when the packaging part 100 is a stepped structure, the sealing part 20 and the heat sealing part are also a stepped structure, which can be tightly combined with the battery tab 1, and can further enhance the sealing performance of the battery as a whole, prevent moisture, oxygen or other harmful substances from penetrating into the battery through the tab area, thereby affecting the performance and safety of the core 3, and facilitate packaging.

[0063] In summary, the battery tab 1 of the embodiment of the application comprises a tab conductive layer 10 and a tab rubber 11, the same two sides of the front and back of the tab conductive layer 10 are provided with an encapsulation part 100, the tab rubber 11 is respectively attached to the corresponding positions of the front and back of the tab conductive layer 10, the tab rubber 11 is attached to the outer surface of the encapsulation part 100, the thickness of the encapsulation part 100 is less than the thickness of the tab conductive layer 10, and the width of the encapsulation part 100 is greater than the width of the chamfer on both sides of the tab conductive layer 10. The technical scheme is characterized in that the same two sides of the front and back of the battery tab 1 are additionally provided with an encapsulation part 100, the thickness of the encapsulation part 100 is less than the thickness of the tab conductive layer 10, that is, the tab body is widened, then the positions of the widened two sides of the tab are thinned, and the width of the encapsulation part 100 is greater than the width of the chamfer on both sides of the tab conductive layer 10, which can provide a space in which the thickness of the encapsulation part 100 gradually decreases. Compared with the chamfering method, the thickness of the encapsulation part 100 is thinner than the chamfering, and when the tab rubber 11 is encapsulated with the shell 2, the space in the thickness direction of the two sides of the tab can be filled after the tab rubber 11 is melted, so that the battery tab 1 does not leak after encapsulation.

[0064] Compared with the prior art, the battery of the embodiment of the application comprises the battery tab 1 of any one of the above. It can be understood that the battery pack of the application can comprise all the technical features and technical effects of the above-mentioned battery tab 1, which will not be described here.

[0065] The above is only the preferred embodiment of the application, and does not limit the patent range of the application, and any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, is included in the patent protection range of the application.

Claims

1. A battery tab, characterized in that, include: The electrode conductive layer and electrode adhesive are provided. Encapsulation portions are provided on both sides of the electrode conductive layer. The electrode adhesive is respectively attached to the corresponding positions on the front and back of the electrode conductive layer. The electrode adhesive is attached to the outer surface of the encapsulation portion. The thickness of the encapsulation portion is less than the thickness of the electrode conductive layer, and the width of the encapsulation portion is greater than the width of the chamfers on both sides of the electrode conductive layer.

2. The battery tab according to claim 1, characterized in that, The encapsulation section has at least one step.

3. The battery tab according to claim 2, characterized in that, The steps are rectangular or trapezoidal.

4. The battery tab according to claim 1, characterized in that, The surface of the encapsulation portion is inclined along the side away from the electrode conductive layer.

5. The battery tab according to claim 1, characterized in that, The height of the encapsulation part and the part where the tab adhesive is applied decreases.

6. The battery tab according to claim 1, characterized in that, The tab adhesive includes a first bonding section that is bonded to the front or back of the tab conductive layer, a second bonding section that is bonded to the outer surface of the encapsulation part, and a third bonding section that extends outward from the encapsulation part, wherein the first bonding section, the second bonding section and the third bonding section are connected in sequence.

7. The battery tab according to claim 6, characterized in that, The first bonding segment includes a first bonding area and a first overlapping area, the second bonding segment includes a second bonding area and a second overlapping area, the first overlapping area and the second bonding area are at least partially overlapping, and the second overlapping area and the third bonding segment are at least partially overlapping.

8. The battery tab according to claim 6, characterized in that, The first bonding section, the second bonding section, and the third bonding section are integrally formed.

9. A battery, characterized in that, The device includes two battery tabs as described in any one of claims 1 to 8, a housing, and a core, wherein the core is disposed within an aluminum-plastic film, both battery tabs are disposed on the housing, and one end of each battery tab is connected to the core via a current collector.

10. The battery according to claim 9, characterized in that, The housing is also provided with a sealing part, which is provided in correspondence with the battery tabs.

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