Tab assembly and soft package battery

Abstract

The invention discloses a tab assembly and a soft package battery, and the tab assembly comprises an outer tab and tab glue. The outer tab comprises an outer connecting part and an inner connecting part which are distributed in the length direction of the outer tab and connected with each other, and the outer connecting part is used for being connected with an external circuit; the inner connecting part is sleeved with the tab glue, the tab glue and the inner connecting part jointly define a connecting cavity, the connecting cavity is provided with a connecting port, the connecting port is used for allowing a false tab of the cell to stretch into the connecting cavity, and the false tab abuts against the outer tab through the tab glue. Therefore, when the tab assembly is used for processing and forming the soft package battery, the false tab can be inserted into the connecting cavity from the connecting port, the tab glue is clamped in the edge sealing structure of the soft package battery, and the tab glue and the edge sealing structure are welded into a whole through a packaging process, so that the outer tab and the false tab are firmly propped against each other without welding, and the reliability of the soft package battery is improved. Therefore, soft package battery processing steps are reduced, processing efficiency is improved, and processing cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly relates to an ear component and a soft-pack battery. Background Art

[0002] In the prior art, there is a battery cell: the battery cell includes an external ear and a dummy ear, and the external ear is welded to the dummy ear by welding, and the external ear can be used to connect to the electrode terminal of the battery. However, the manufacturing process of the battery cell needs to include the step of welding the external ear and the dummy ear together, which is rather cumbersome, increases the complexity of the manufacturing process of the battery cell and reduces the processing efficiency while increasing the processing cost. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. For this purpose, the present invention provides an ear component that can be used for a soft-pack battery, reducing the processing cost of the soft-pack battery and improving the processing efficiency.

[0004] The present invention also provides a soft-pack battery having the above ear component.

[0005] The ear component according to the first aspect embodiment of the present invention includes an external ear and ear glue.

[0006] The external ear includes an external connection portion and an internal connection portion that are distributed along the length direction of the external ear and are connected to each other. The external connection portion is used to connect to an external circuit; the ear glue is sleeved outside the internal connection portion, and together with the internal connection portion, a connection cavity is defined. The connection cavity has a connection port, and the connection port is used for the dummy ear of the battery cell to extend into the connection cavity, and the ear glue makes the dummy ear abut against the external ear.

[0007] The ear component according to the embodiment of the present invention has at least the following beneficial effects:

[0008] In the ear component of this embodiment, a connection cavity and a connection port communicating with the connection cavity are defined between the ear glue and the external ear. Therefore, when the ear component of this embodiment is used to process a soft-pack battery, the dummy ear can be inserted into the connection cavity from the connection port, and the ear glue can be clamped in the edge sealing structure of the soft-pack battery. Through the encapsulation process, the ear glue is welded to the edge sealing structure as a whole, so that the external ear and the dummy ear are firmly abutted together without welding. Thus, when the ear component of this embodiment is used for a soft-pack battery, there is no need to weld between the external ear and the dummy ear, thereby reducing the processing steps of the soft-pack battery, improving the processing efficiency and reducing the processing cost.

[0009] According to some embodiments of the present invention, the internal connection part includes a first connection part and a second connection part, the first connection part has a first connection surface facing the second connection part, the second connection part has a second connection surface facing the first connection part, the first connection surface and the second connection surface are spaced apart to form a connection gap, the connection cavity includes the connection gap, at least one of the first connection part and the second connection part is a flexible structure, the fake pole ear can extend into the connection gap, and the first connection surface and the second connection surface are pressed against the fake pole ear by pressing.

[0010] According to some embodiments of the present invention, the inner connection portion further includes a first protrusion, the first protrusion is connected to the first connection surface and protrudes from the first connection surface toward the second connection surface; and / or,

[0011] The inner connection portion includes a second protruding portion, which is connected to the second connection surface and protrudes from the second connection surface toward the first connection surface.

[0012] According to some embodiments of the present invention, the inner connection portion further comprises a first protrusion, the first protrusion is connected to the first connection surface and protrudes from the first connection surface toward the second connection surface, and an end of the first protrusion facing away from the first connection surface is a pointed end; and / or,

[0013] The inner connection portion includes a second protruding portion, the second protruding portion is connected to the second connection surface and protrudes from the second connection surface toward the first connection surface, and an end of the second protruding portion facing away from the second connection surface is a pointed end.

[0014] According to some embodiments of the present invention, the inner connection portion further includes a first protrusion, the first protrusion is connected to the first connection surface and protrudes from the first connection surface toward the second connection surface, and the first protrusion is inclined relative to the first connection surface toward the outer connection portion; and / or,

[0015] The inner connection portion includes a second protruding portion, the second protruding portion is connected to the second connection surface and protrudes from the second connection surface toward the first connection surface, and the second protruding portion is inclined relative to the second connection surface toward the outer connection portion.

[0016] According to some embodiments of the present invention, the first connecting portion includes a first connecting segment and a second connecting segment, the first connecting segment is connected to the external connecting portion, the second connecting segment is connected to an end of the first connecting segment away from the external connecting portion, and is folded toward the external connecting portion relative to the first connecting segment, and the false pole ear can be bent and clamped between the first connecting segment and the second connecting segment; and / or,

[0017] The second connecting portion includes a third connecting section and a fourth connecting section. The third connecting section is connected to the outer connecting portion. The fourth connecting section is connected to one end of the third connecting section facing away from the outer connecting portion and is folded relative to the third connecting section toward the outer connecting portion. The false tab can be bent and clamped between the third connecting section and the fourth connecting section.

[0018] According to some embodiments of the present invention, the first connecting surface has a first groove. The first groove extends along a set direction to the surface of the first connecting portion to form a first opening on the surface of the first connecting portion. The first groove is used to form a first glue-containing cavity with the surface of the false tab; and / or,

[0019] The surface of the second connecting surface has a second groove. The second groove extends along a set direction to the surface of the second connecting portion to form a second opening on the surface of the second connecting portion. The second groove is used to form a second glue-containing cavity with the surface of the false tab.

[0020] According to some embodiments of the present invention, the tab glue protrudes from the inner connecting portion in the opening direction of the connecting port.

[0021] According to some embodiments of the present invention, the tab glue is a closed annular structure; or,

[0022] The tab glue further includes an avoidance opening penetrating along the width direction of the outer tab. The avoidance opening extends along the length direction of the outer tab and communicates with the connecting port. The tab glue is configured such that the size of the avoidance opening in the thickness direction of the outer tab is not less than the thickness of the false tab.

[0023] The soft-pack battery according to the second aspect embodiment of the present invention includes a soft-pack outer shell, an electric core, and the tab assembly according to the first aspect embodiment. The soft-pack outer shell includes a packaging main body and a sealing edge structure. The sealing edge structure is connected to the packaging main body. The packaging main body has a receiving cavity. The sealing edge structure includes a first sealing edge portion and a second sealing edge portion adhesively bonded along its own thickness direction. The electric core includes an electric core main body and a false tab. The false tab is connected to the electric core main body. The electric core main body is disposed in the receiving cavity. The false tab is inserted into the connecting cavity from the connecting port and abuts against the inner connecting portion. The inner connecting portion is clamped between the first sealing edge portion and the second sealing edge portion, and the tab glue is welded to the first sealing edge portion and the second sealing edge portion.

[0024] The soft-pack battery according to the embodiment of the present invention has at least the following beneficial effects:

[0025] Adopting the tab assembly of the first aspect embodiment, a connection cavity and a connection port communicating with the connection cavity are defined between the tab glue and the external tab in the tab assembly. Therefore, during the processing, the dummy tab can be inserted into the connection cavity from the connection port, and the tab glue can be clamped within the edge sealing structure of the soft-pack battery. Through the encapsulation process, the tab glue and the edge sealing structure are welded into one body, thereby firmly abutting the external tab and the dummy tab together without welding. Thus, when the tab assembly of this embodiment is used in a soft-pack battery, welding between the external tab and the dummy tab is not required, thereby reducing the processing steps of the soft-pack battery, improving the processing efficiency, and reducing the processing cost.

[0026] According to some embodiments of the present invention, the soft-pack battery further includes conductive glue, and the conductive glue is disposed between the inner connection portion and the dummy tab.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The following further describes the present invention in conjunction with the drawings and embodiments, where:

[0029] Figure 1 is a schematic structural diagram of the first tab assembly of the first aspect embodiment of the present invention;

[0030] Figure 2 is a schematic structural diagram of the second tab assembly of the first embodiment of the present invention;

[0031] Figure 3 is Figure 2 a cross-sectional view;

[0032] Figure 4 is a cross-sectional view of the third tab assembly of the first aspect embodiment of the present invention;

[0033] Figure 5 is a cross-sectional view of the fourth tab assembly of the first aspect embodiment of the present invention;

[0034] Figure 6 is a cross-sectional view of the fifth tab assembly of the first aspect embodiment of the present invention;

[0035] Figure 7 is a cross-sectional view of the sixth tab assembly of the first aspect embodiment of the present invention;

[0036] Figure 8 is a cross-sectional view of the seventh tab assembly of the first aspect embodiment of the present invention;

[0037] Figure 9 is a cross-sectional view of the eighth tab assembly of the first aspect embodiment of the present invention;

[0038] Figure 10 This is a cross-sectional view of the first type of soft-pack battery according to the second aspect of the present invention;

[0039] Figure 11 is Figure 10 an enlarged view of area A in

[0040] Figure 12 This is a cross-sectional view of the second type of soft-pack battery according to the second aspect of the present invention;

[0041] Figure 13 is Figure 12 an enlarged view of area B in

[0042] Figure 14 This is a cross-sectional view of the third type of soft-pack battery according to the second aspect of the present invention;

[0043] Figure 15 is Figure 14 an enlarged view of area A in

[0044] Reference numerals:

[0045] tab assembly 1000;

[0046] external tab 100, external connection part 110, internal connection part 120, first connection part 121, first connection surface 1211, first connection segment 1212, second connection segment 1213, first groove 1214, second connection part 122, second connection surface 1221, third connection segment 1222, fourth connection segment 1223, second groove 1224, connection gap 123, first protrusion 124, second protrusion 125;

[0047] tab adhesive 200, avoidance opening 210;

[0048] connection cavity 300, connection port 310;

[0049] soft-pack housing 400, encapsulation main body 410, accommodation cavity 411, edge-sealing structure 420, first edge-sealing part 421, second edge-sealing part 422;

[0050] electric core 500, electric core main body 510, dummy tab 520. Detailed implementation manners

[0051] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0052] In the description of the present invention, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc., is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0053] In the description of the present invention, the meaning of several is more than one, and the meaning of multiple is more than two. Understandings such as greater than, less than, exceeding, etc. do not include the present number, and understandings such as above, below, within, etc. include the present number. If there is a description of first and second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0054] In the description of the present invention, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0055] In the description of the present invention, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0056] In the prior art, there is such a battery cell: the battery cell includes an external tab and a dummy tab, and the external tab is welded to the dummy tab by welding, and the external tab can be used to connect to the electrode terminal of the battery. However, the manufacturing process of the battery cell needs to include the step of welding the external tab and the dummy tab together, which is relatively cumbersome, will increase the complexity of the manufacturing process of the battery cell and reduce the processing efficiency and increase the processing cost.

[0057] In view of the above background, the first aspect embodiment of the present invention proposes an ear assembly, which can be used for a soft-pack battery, reduce the processing cost of the soft-pack battery and improve the processing efficiency. Refer to Figure 1 , Figure 1 is a schematic structural diagram of the first ear assembly according to the first aspect embodiment of the present invention. The ear assembly 1000 of this embodiment includes an external tab 100 and an ear glue 200.

[0058] Among them, the external tab 100 is made of one or several of metals such as aluminum, copper or nickel. For example, as a part of the negative tab of the soft-pack battery, the external tab 100 is made of copper or nickel. Correspondingly, when the external tab 100 is used as a part of the positive tab, the external tab 100 is made of aluminum. The external tab 100 includes an external connection part 110 and an internal connection part 120 that are distributed along its own length direction and are connected to each other. The external connection part 110 is used to connect to an external circuit. The tab adhesive 200 is made of modified polypropylene (PP) for example. The tab adhesive 200 is sleeved outside the internal connection part 120 and jointly defines a connection cavity 300 with the internal connection part 120. The connection cavity 300 has a connection port 310. The connection port 310 is used for the dummy tab 520 of the battery core 500 to extend into the connection cavity 300, and the dummy tab 520 is pressed against the external tab 100 through the tab adhesive 200.

[0059] Specifically, in the tab assembly 1000 of this embodiment, a connection cavity 300 and a connection port 310 communicating with the connection cavity 300 are defined between the tab adhesive 200 and the external tab 100. Therefore, when the tab assembly of this embodiment is used to process a soft-pack battery, the dummy tab 520 can be inserted into the connection cavity 300 from the connection port 310, and the tab adhesive 200 can be clamped in the edge sealing structure 420 of the soft-pack battery. The tab adhesive 200 and the edge sealing structure 420 are welded into one body through the sealing process, so that the external tab 100 and the dummy tab 520 are firmly abutted together without welding. Thus, when the tab assembly 1000 of this embodiment is used for a soft-pack battery, there is no need to weld between the external tab 100 and the dummy tab 520, thereby reducing the processing steps of the soft-pack battery, improving the processing efficiency and reducing the processing cost.

[0060] Refer to Figure 2 、 Figure 3 , Figure 10 and Figure 11 , Figure 2 FIG. is a schematic structural diagram of the second tab assembly according to the first embodiment of the present invention. Figure 3 is Figure 2 a cross-sectional view of Figure 10 FIG. is a cross-sectional view of the first soft-pack battery according to the second aspect embodiment of the present invention. Figure 11 is Figure 10 an enlarged view of area A in Figure 3As shown). At least one of the first connecting portion 121 and the second connecting portion 122 is a flexible structure, and the false tab 520 can extend into the connecting gap 123 (as Figure 11 shown). Specifically, since at least one of the first connecting portion 121 and the second connecting portion 122 is a flexible structure, the first connecting surface 1211 and the second connecting surface 1221 can be pressed against the false tab 520 by pressing (the pressure provided during the sealing process of the soft-pack battery). For example, the first connecting portion 121 is a flexible structure. After the false tab 520 is inserted into the connecting gap 123, pressure is applied to the first connecting portion 121 to cause the first connecting portion 121 to deform toward the second connecting portion 122, so that the first connecting portion 121 abuts against the surface of the false tab 520 facing away from the second connecting portion 122, and the false tab 520 is clamped between the first connecting portion 121 and the second connecting portion 122. It can be known that in this embodiment, both sides of the false tab 520 in its own thickness direction abut against the external tab 100, which can increase the contact area between the false tab 520 and the external tab 100, ensure the stability and conductivity of the connection, and at the same time improve the connection strength between the false tab 520 and the external tab 100, thereby reducing the risk of detachment between the false tab 520 and the external tab 100, further optimizing the overall performance and reliability of the soft-pack battery, extending the battery life, and meeting the production requirements of high efficiency and low cost.

[0061] Referring to Figure 4 、 Figure 12 and Figure 13 , Figure 4 is a cross-sectional view of the third tab assembly according to the first aspect embodiment of the present invention, Figure 12 is a cross-sectional view of the second soft-pack battery according to the second aspect embodiment of the present invention, Figure 13 is Figure 12 the enlarged view of area B in Figure 4 shown. On the basis of the above embodiment, the inner connecting portion 120 further includes a first protruding portion 124 (as Figure 13As shown), it can not only further increase the contact area between the fake pole ear 520 and the external pole ear 100, so as to reduce the internal resistance of the battery and improve the conductive efficiency, but also further reduce the risk of separation of the fake pole ear 520 and the external pole ear 100. Further, on this basis, the end of the first protrusion 124 that is away from the first connection surface 1211 is a sharp point, so that the first protrusion 124 can more easily penetrate into the inside of the fake pole ear 520, thereby reducing the processing difficulty of the soft-pack battery and improving production efficiency. Similarly, in some embodiments, the internal connection portion 120 includes a second protrusion 125, the second protrusion 125 is connected to the second connection surface 1221, and protrudes from the second connection surface 1221 toward the first connection surface 1211. Further, the end of the second protrusion 125 that is away from the second connection surface 1221 is a sharp point, which will not be repeated here.

[0062] Reference Figure 5 , Figure 5 This is a cross-sectional view of the fourth type of pole lug assembly of the first aspect of the present invention. In some embodiments, the inner connection portion 120 further includes a first protrusion 124, which is tilted relative to the first connection surface 1211 toward the outer connection portion 110, that is, the first protrusion 124 is tilted relative to the fake pole lug 520. On the one hand, the contact area between the fake pole lug 520 and the outer pole lug 100 can be increased to improve the conductive performance; on the other hand, the connection between the fake pole lug 520 and the outer pole lug 100 can be achieved, and the connection stability can be enhanced, thereby reducing the risk of the fake pole lug 520 falling off. Similarly, in some embodiments, the inner connection portion 120 further includes a second protrusion 125, which is tilted relative to the second connection surface 1221 toward the outer connection portion 110, which will not be repeated here.

[0063] Reference Figure 6 , Figure 6This is a cross-sectional view of the fifth tab assembly according to the first aspect of the present invention. In some embodiments, the first connecting portion 121 includes a first connecting segment 1212 and a second connecting segment 1213. The first connecting segment 1212 is connected to the outer connecting portion 110, and the second connecting segment 1213 is connected to one end of the first connecting segment 1212 facing away from the outer connecting portion 110 and is folded relative to the first connecting segment 1212 towards the outer connecting portion 110. The dummy tab 520 can be bent and clamped between the first connecting segment 1212 and the second connecting segment 1213, increasing the connection area between the outer tab 100 and the dummy tab 520 and improving the electrical conductivity. In addition, both the first connecting portion 121 and the second connecting portion 122 are bent to form a hook-shaped structure, which can more firmly achieve the connection strength between the first connecting portion 121 and the dummy tab 520, thereby further reducing the risk of the dummy tab 520 falling off and improving the overall stability and service life of the soft-pack battery. Similarly, in some embodiments, the second connecting portion 122 includes a third connecting segment 1222 and a fourth connecting segment 1223. The third connecting segment 1222 is connected to the outer connecting portion 110, and the fourth connecting segment 1223 is connected to one end of the third connecting segment 1222 facing away from the outer connecting portion 110 and is folded relative to the third connecting segment 1222 towards the outer connecting portion 110. The dummy tab 520 can be bent and clamped between the third connecting segment 1222 and the fourth connecting segment 1223.

[0064] Further, when the tab assembly 1000 of this embodiment is used in a multi-tab battery cell 500, that is, the soft-pack battery includes a plurality of dummy tabs 520, the plurality of dummy tabs 520 are all inserted into the connection gap 123, and the two outermost dummy tabs 520 are bent and respectively clamped between the first connecting segment 1212 and the second connecting segment 1213, and the third connecting segment 1222 and the fourth connecting segment 1223.

[0065] Refer to Figure 7 , Figure 7This is a cross-sectional view of the sixth tab assembly according to the first aspect of the present invention. In some embodiments, the first connection surface 1211 has a first groove 1214. The first groove 1214 extends in a set direction to the surface of the first connection portion 121 and forms a first opening on the surface of the first connection portion 121. The first groove 1214 is used to form a first glue-containing cavity with the surface of the dummy tab 520. Herein, the set direction is, for example, the width direction of the outer tab 100, or the length direction of the outer tab 100, etc., as long as a first opening can be formed on the surface of the first connection portion 121 that is not the first connection surface 1211. For example, the first groove 1214 extends along the width direction of the outer tab 100 and extends to the surface of the first connection portion 121 in the width direction of the outer tab 100 to form a first opening on the surface of the first connection portion 121 in the width direction of the outer tab 100. Therefore, when the tab assembly 1000 of this embodiment is used in a soft-pack battery, during the sealing process of the edge-sealing structure 420, the tab glue 200 can be melted by heat and automatically enter the first glue-containing cavity from the first opening, so that the dummy tab 520 and the outer tab 100 are bonded to each other, enhancing the firmness of the connection. And during the whole processing process, there is no need to additionally add a step of bonding between the dummy tab 520 and the outer tab 100, thereby simplifying the production process, improving the production efficiency, and reducing the manufacturing cost.

[0066] Similarly, in some embodiments, the surface of the second connection surface 1221 has a second groove 1224. The second groove 1224 extends in a set direction to the surface of the second connection portion 122 and forms a second opening on the surface of the second connection portion 122. The second groove 1224 is used to form a second glue-containing cavity with the surface of the dummy tab 520, which will not be elaborated here.

[0067] Referring to Figure 2 and Figure 8 , on the basis of the above embodiments, the tab glue 200 is, for example, a closed annular structure (as shown in Figure 2 ), that is, the tab glue 200 is a complete annular structure. When the tab assembly of this embodiment is used in a soft-pack battery, the end of the dummy tab 520 can be wrapped in the tab glue 200, thereby reducing the risk of the cutting edge of the dummy tab 520 scratching the aluminum-plastic film and reducing the risk of short circuit of the soft-pack battery.

[0068] On the contrary, in some embodiments, the tab glue 200 further includes an avoidance opening 210 penetrating along the width direction of the outer tab 100 (as shown in Figure 8As shown, the avoidance opening 210 extends along the length direction of the outer tab and communicates with the connection opening 310. The tab glue 200 is arranged such that the size of the avoidance opening 210 in the thickness direction of the outer tab 100 is not less than the thickness of the dummy tab 520. Therefore, during the installation process of the soft-pack battery, it is easier to insert the dummy tab 520 into the connection gap 123, thereby reducing the processing difficulty of the soft-pack battery, improving the processing efficiency, and reducing the processing cost. Specifically, as in the above embodiment, the tab glue 200 has a closed annular structure. When inserting the dummy tab 520 into the connection gap 123, it is necessary to align the dummy tab 520 with the connection opening 310 to avoid interference between the dummy tab 520 and the tab glue 200. Thus, during the processing, it is necessary to accurately position the dummy tab 520 and the tab assembly 1000, which poses certain requirements for the processing accuracy. In this embodiment, however, the tab glue 200 has an avoidance opening 210 that penetrates along the width direction of the outer tab 100, and the size of the avoidance opening 210 in the thickness direction of the outer tab 100 is greater than the thickness of the dummy tab 520. Therefore, when inserting the dummy tab 520 into the connection gap 123, even if there is a certain deviation between the dummy tab 520 and the connection opening, the dummy tab 520 can still extend into the connection gap 123, making the processing of the soft-pack battery simpler. In addition, after the hot pressing and sealing of the edge sealing structure 420 are completed, due to the melting of the tab glue 200, the avoidance opening 210 will be automatically filled, thereby reducing the risk of the dummy tab 520 scratching the aluminum-plastic film.

[0069] Referring to Figure 9 , Figure 14 and Figure 15 , Figure 9 FIG. Figure 14 is a cross-sectional view of the eighth tab assembly according to the first aspect of the present invention, Figure 15 FIG. Figure 14 is an enlarged view of the A area in Figure 9 . In some embodiments, the tab glue 200 protrudes from the inner connection portion 120 in the opening direction of the connection opening 310 (as Figure 15As shown, it can reduce the risk of the false tab 520 scratching the aluminum-plastic film and further reduce the risk of short circuit of the soft-pack battery. Specifically, the soft-pack battery includes a soft-pack housing 400 and an electric core 500. The soft-pack housing 400 includes a packaging main body 410 and a sealing edge structure 420 connected to the packaging main body 410. The packaging main body 410 has a receiving cavity 411. The electric core 500 includes an electric core main body 510 and a false tab 520 connected to the electric core main body 510. The electric core main body 510 is disposed in the receiving cavity 411. The false tab 520 extends from the electric core main body 510 to the inner wall of the receiving cavity 411 and protrudes from the sealing edge structure 420, that is, one end of the false tab 520 is close to the inner wall of the receiving cavity 411. Therefore, when the battery is squeezed, there is a risk that the false tab 520 scratches the aluminum-plastic film and causes a short circuit of the soft-pack battery. Based on this, in the tab assembly 1000 of this embodiment, the tab adhesive 200 protrudes from the inner connecting portion 120 in the opening direction of the connecting port 310. When the tab assembly is used for a soft-pack battery, the tab adhesive 200 can wrap around the part of the false tab 520 close to the inner wall of the receiving cavity 411, thereby reducing the risk of the false tab 520 scratching the aluminum-plastic film. In addition, in some embodiments, the false tab 520 is bent, and the bent portion is close to the inner wall of the receiving cavity 411. That is, when the tab assembly of this embodiment is used for a soft-pack battery, the tab adhesive 200 can wrap around the bent portion of the false tab 520 (such as Figure 15 As shown), so as to improve the strength of the bent portion of the false tab 520, effectively avoid damage to the false tab 520 caused by external force impact, and at the same time, can play a buffering role between the false tab 520 and the electric core main body 510, protect the electric core main body 510, and further improve the overall safety and service life of the battery.

[0070] Refer to Figures 10 to 15, The pouch cell according to the embodiment of the second aspect of the present invention includes a pouch outer shell 400, an electrode core 500, and the tab assembly 1000 of the embodiment of the first aspect. The pouch outer shell 400 includes a packaging main body 410 and a sealing edge structure 420. The sealing edge structure 420 is connected to the packaging main body 410. The packaging main body 410 has a receiving cavity 411. The sealing edge structure 420 includes a first sealing edge portion 421 and a second sealing edge portion 422 that are bonded along its own thickness direction. The electrode core 500 is, for example, a wound electrode core or a stacked electrode core. The electrode core 500 includes an electrode core main body 510 and dummy tabs 520. The dummy tabs 520 are connected to the electrode core main body 510. The electrode core main body 510 is disposed in the receiving cavity 411. The dummy tabs 520 are inserted into the connection cavity 300 from the connection port 310 and are in contact with the inner connection portion 120. The inner connection portion 120 is clamped between the first sealing edge portion 421 and the second sealing edge portion 422, and the tab adhesive 200 is welded to the first sealing edge portion 421 and the second sealing edge portion 422 (specifically, welded to the melting adhesive layer inside the first sealing edge portion 421 and the second sealing edge portion 422, that is, the PP layer). Specifically, the electrode core 500 includes an anode sheet and a cathode sheet. The anode sheet includes a first main body portion coated with an active material and an anode dummy tab connected to the first main body portion. The cathode sheet includes a second main body portion coated with an active material and a cathode dummy tab connected to the second main body portion. The first main body portion and the second main body portion are wound or stacked to form the electrode core main body 510. The dummy tabs 520 include an anode dummy tab and a cathode dummy tab. The anode dummy tab and the cathode dummy tab respectively extend to the inner wall of the receiving cavity 411 and are respectively inserted into the connection cavities 300 of two different tab assemblies 1000.

[0071] Specifically, the tab assembly 1000 of the embodiment of the first aspect is adopted in this embodiment. A connection cavity 300 and a connection port communicating with the connection cavity 300 are defined between the tab adhesive 200 and the outer tab 100 in the tab assembly 1000. Therefore, during the processing, the dummy tabs 520 can be inserted into the connection cavity 300 from the connection port, and the tab adhesive 200 can be clamped in the sealing edge structure 420 of the pouch cell. The tab adhesive 200 is welded to the sealing edge structure 420 as a whole through the packaging process, so that the outer tab 100 and the dummy tabs 520 are firmly in contact with each other without welding. Thus, when the tab assembly of this embodiment is used for a pouch cell, welding is not required between the outer tab 100 and the dummy tabs 520, thereby reducing the processing steps of the pouch cell, improving the processing efficiency and reducing the processing cost.

[0072] It should be noted that all the technical features of the embodiment of the first aspect are adopted in this embodiment. Therefore, this embodiment has all the beneficial effects brought by the embodiment of the first aspect, which will not be elaborated here.

[0073] Based on the above embodiments, the soft-pack battery further includes a conductive adhesive, which is disposed between the inner connection portion 120 and the dummy tab 520. For example, the inner connection portion 120 includes a first connection portion 121 and a second connection portion 122, and the conductive adhesive is disposed between the first connection portion 121 and the dummy tab 520, and / or the conductive adhesive is disposed between the second connection portion 122 and the dummy tab 520 to improve the connection strength between the outer tab 100 and the dummy tab 520, thereby reducing the risk of the outer tab 100 falling off and improving the quality of the soft-pack battery of this embodiment.

[0074] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. Tab assembly, characterized in that, include: The external tab includes an external connection portion and an internal connection portion distributed along its length and connected to each other, wherein the external connection portion is used to connect to an external circuit; The pole ear glue is sleeved on the outside of the inner connecting part and defines a connecting cavity together with the inner connecting part. The connecting cavity has a connecting port, which is used to allow the dummy pole ear of the power core to extend into the connecting cavity, and the dummy pole ear is pressed against the outer pole ear through the pole ear glue.

2. The tab assembly according to claim 1, wherein The inner connection part includes a first connection part and a second connection part, the first connection part has a first connection surface facing the second connection part, the second connection part has a second connection surface facing the first connection part, the first connection surface and the second connection surface are spaced apart to form a connection gap, the connection cavity includes the connection gap, at least one of the first connection part and the second connection part is a flexible structure, the fake pole ear can extend into the connection gap, and the first connection surface and the second connection surface are pressed against the fake pole ear by pressing.

3. The tab assembly according to claim 2, wherein, The inner connection portion further includes a first protrusion, which is connected to the first connection surface and protrudes from the first connection surface toward the second connection surface; and / or, The inner connection portion includes a second protruding portion, which is connected to the second connection surface and protrudes from the second connection surface toward the first connection surface.

4. The tab assembly according to claim 2, wherein, The inner connection portion further includes a first protrusion, the first protrusion is connected to the first connection surface and protrudes from the first connection surface toward the second connection surface, and an end of the first protrusion facing away from the first connection surface is a tip; and / or, The inner connection portion includes a second protruding portion, the second protruding portion is connected to the second connection surface and protrudes from the second connection surface toward the first connection surface, and an end of the second protruding portion facing away from the second connection surface is a pointed end.

5. The tab assembly according to claim 2, wherein, The inner connection portion further includes a first protrusion, the first protrusion is connected to the first connection surface and protrudes from the first connection surface toward the second connection surface, and the first protrusion is inclined relative to the first connection surface toward the outer connection portion; and / or, The inner connection portion includes a second protruding portion, the second protruding portion is connected to the second connection surface and protrudes from the second connection surface toward the first connection surface, and the second protruding portion is inclined relative to the second connection surface toward the outer connection portion.

6. The tab assembly according to claim 2, wherein The first connecting portion includes a first connecting section and a second connecting section, the first connecting section is connected to the external connecting section, the second connecting section is connected to an end of the first connecting section away from the external connecting section, and is folded toward the external connecting section relative to the first connecting section, and the false pole ear can be bent and clamped between the first connecting section and the second connecting section; and / or, The second connecting portion includes a third connecting segment and a fourth connecting segment, the third connecting segment is connected to the external connecting portion, the fourth connecting segment is connected to an end of the third connecting segment that is away from the external connecting portion, and is folded toward the external connecting portion relative to the third connecting segment, and the fake pole ear can be bent and clamped between the third connecting segment and the fourth connecting segment.

7. The tab assembly according to any one of claims 2 to 6, characterized in that, The first connection surface has a first groove, the first groove extends along a set direction to the surface of the first connection part to form a first opening on the surface of the first connection part, and the first groove is used to form a first glue-containing cavity with the surface of the false pole ear; and / or, The surface of the second connecting surface has a second groove, which extends along a set direction to the surface of the second connecting portion to form a second opening on the surface of the second connecting portion. The second groove is used to form a second glue-containing cavity with the surface of the dummy tab.

8. The tab assembly according to claim 2, wherein, The tab glue protrudes from the inner connection portion from the opening direction of the connection port.

9. The tab assembly according to claim 2, wherein, The ear glue is a closed ring structure; or, The tab glue also includes an avoidance opening penetrating along the width direction of the outer tab, the avoidance opening extending along the length direction of the outer tab and connected to the connection port, and the tab glue is configured such that the size of the avoidance opening in the thickness direction of the outer tab is not less than the thickness of the dummy tab.

10. Soft-pack battery, characterized in that, include: A soft package shell, comprising a packaging body and an edge sealing structure, wherein the edge sealing structure is connected to the packaging body, the packaging body has a receiving cavity, and the edge sealing structure comprises a first edge sealing portion and a second edge sealing portion bonded along its own thickness direction; A battery cell, comprising a battery cell body and a false pole tab, wherein the false pole tab is connected to the battery cell body, and the battery cell body is arranged in the accommodating cavity; In the tab assembly described in any one of claims 1 to 9, the inner connecting portion is clamped between the first edge sealing portion and the second edge sealing portion, and the tab glue is fused to the first edge sealing portion and the second edge sealing portion, and the dummy tab is inserted into the connecting cavity from the connecting port and abuts against the inner connecting portion.

11. The soft-pack battery according to claim 10, wherein, The soft-pack battery further includes a conductive adhesive, and the conductive adhesive is disposed between the inner connecting portion and the dummy tab.

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