Electrode assembly and battery

Abstract

The embodiment of the utility model provides an electrode assembly and a battery comprising the same. The electrode assembly may include: a laminated body including a positive pole piece, a diaphragm and a negative pole piece laminated in a thickness direction of the laminated body, the laminated body having a first surface and a second surface opposite to each other in the thickness direction, a first side surface and a second side surface opposite to each other in a first direction perpendicular to the thickness direction, and a second surface opposite to each other in a second direction perpendicular to the thickness direction; a third side surface and a fourth side surface which are opposite to each other are arranged in a second direction perpendicular to the thickness direction and the first direction; the first rubberizing structure is continuously arranged on the first side surface, the first surface and the second side surface; and the second rubberizing structure is continuously arranged on at least one part of the first surface, one of the third side surface and the fourth side surface, and at least one part of the second surface. According to the technical scheme, at least the lamination body can be uniformly stressed in the production process, and the conditions of gaps and cracks between the pole pieces are avoided.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to an electrode assembly and a battery including the electrode assembly. Background Art

[0002] With the strong support of the world for the green economy, the new energy industry represented by lithium-ion batteries has made great progress. At present, the production of batteries (such as lithium-ion batteries) is mainly divided into two production processes: lamination and winding. Among them, the laminated electrode assembly (also known as laminated battery cell) has many advantages such as higher energy density, more uniform heat dissipation, and higher safety. However, the production process of the laminated electrode assembly is more complicated, which makes the production speed still have certain disadvantages compared with the winding electrode assembly.

[0003] The main component of the laminated electrode assembly for energy storage and transfer is the laminated body 10, Figure 1 As shown. After the lamination process, the laminate 10 usually needs to be hot-pressed at a certain temperature and pressure, and then the tape 30 is bonded to the opposite sides 21 and 22 of the laminate 10 to maintain the tightness of the laminate 10. Thereafter, the laminate 10 usually needs to be transferred to enter the subsequent preparation process. During the transfer process, due to the simple bonding of the tape 30 on the sides 21 and 22, it is impossible to ensure sufficient stress to maintain the tightness of the first large surface 25 and the second large surface (opposite to the first large surface 25, not numbered) of the laminate 10. Especially when producing a laminate 10 with a longer length, cracks 80 are very likely to occur in the first direction X of the first large surface 25 and the second large surface due to the loss of the required tightness.

[0004] The stacked sheets with serious cracks will be removed during the quality inspection process, resulting in material waste and reducing the yield rate of electrode assembly production. In addition, electrode assemblies with less cracks may be circulated in the subsequent production process. The gaps between the pole pieces will greatly affect the impedance and gas production performance of the electrode assemblies. The uneven performance of the electrode assemblies will also seriously affect the performance of the battery module and battery pack. Utility Model Content

[0005] In response to the above problems, the present application proposes an electrode assembly and a battery including the electrode assembly. By improving the gluing method of the laminated body, the laminated body can be evenly stressed during the production process to further protect the laminated body and avoid gaps and cracks between the pole pieces.

[0006] According to an embodiment of the present application, an electrode assembly is provided, comprising: a laminate body, comprising a positive electrode plate, a separator and a negative electrode plate stacked in the thickness direction of the laminate body, wherein the laminate body has a first surface and a second surface relative to each other in the thickness direction, a first side surface and a second side surface relative to each other in a first direction perpendicular to the thickness direction, and a third side surface and a fourth side surface relative to each other in a second direction perpendicular to the thickness direction and the first direction; a first glue structure, continuously arranged on the first side surface, on the first surface, and on the second side surface; and a second glue structure, continuously arranged on at least a portion of the first surface, on one of the third side surface and the fourth side surface, and on at least a portion of the second surface.

[0007] In some embodiments, the second adhesive structure at least partially overlaps the first adhesive structure on the first surface.

[0008] In some embodiments, the first adhesive structure is further continuously disposed on the second surface, thereby surrounding the first side surface, the first surface, the second side surface, and the second surface.

[0009] In some embodiments, the second adhesive structure overlaps the first adhesive structure on both the first surface and the second surface.

[0010] In some embodiments, an end of the second adhesive structure is flush with an edge of the first adhesive structure away from one of the third side surface and the fourth side surface.

[0011] In some embodiments, an outer edge of the first adhesive structure is flush with one of the third side surface and the fourth side surface.

[0012] In some embodiments, the second adhesive structure is continuously disposed on the first surface, one of the third side surface and the fourth side surface, the second surface, and the other of the third side surface and the fourth side surface to surround the first surface, the third side surface, the second surface, and the fourth side surface.

[0013] In some embodiments, the second adhesive structure includes a second adhesive structure located on the third side and a second adhesive structure located on the fourth side, wherein the second adhesive structure located on the third side and the second adhesive structure located on the fourth side are offset from each other in the second direction.

[0014] In some embodiments, the electrode assembly has a first electrode tab and a second electrode tab at the first side and the second side, respectively. According to an embodiment of the present application, a battery is also provided, which may include the electrode assembly of the above embodiment.

[0015] The above technical solution of the present application, by combining the first adhesive structure with the second adhesive structure, can make the laminate body evenly stressed on all sides during the production process, avoiding the laminate body from cracking due to uneven stress. It ensures that the laminate body has good flatness during the production process, avoids the situation where gaps appear between the pole pieces, reduces the defective rate of the laminate body in the production of the electrode assembly, and thus reduces the defective rate of the electrode assembly production. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a three-dimensional schematic diagram of a laminated body in the prior art.

[0018] Figure 2A It is a three-dimensional schematic diagram of an electrode assembly according to an embodiment of the present application.

[0019] Figure 2B yes Figure 2A A schematic side view and a partially enlarged view of the electrode assembly in the second direction.

[0020] Figure 3A It is a three-dimensional schematic diagram of an electrode assembly according to another embodiment of the present application.

[0021] Figure 3B yes Figure 3A Schematic side view of the electrode assembly in the second direction Y.

[0022] Figure 3C yes Figure 3A Schematic side view of the electrode assembly in the first direction X.

[0023] Figure 4A It is a three-dimensional schematic diagram of an electrode assembly according to another embodiment of the present application.

[0024] Figure 4B yes Figure 4A Schematic side view of the electrode assembly in the first direction X. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0026] The following disclosure provides many different embodiments or examples for realizing different features of the provided subject matter. Specific examples of components and arrangements will be described below to simplify the present invention. Of course, these are merely examples and are not intended to limit the present invention. For example, in the following description, forming a first component above or on a second component may include an embodiment in which the first component and the second component are in direct contact, and may also include an embodiment in which an additional component is formed between the first component and the second component so that the first component and the second component may not be in direct contact. Moreover, the present invention may repeatedly refer to numbers and / or letters in various examples. This repetition is only for simplicity and clarity, and does not itself represent the relationship between the various embodiments and / or configurations discussed.

[0027] In addition, the embodiments and features in the embodiments of the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] An embodiment of the present application provides an electrode assembly. Figure 2A is a three-dimensional schematic diagram of an electrode assembly 100A according to an embodiment of the present application. Figure 2A As shown, the electrode assembly 100A may include a laminate 110, which is a laminate formed by cutting a certain number of positive electrode sheets and negative electrode sheets into a designed size and stacking them with a separator in a specific order. Therefore, the laminate 110 may include positive electrode sheets, separators, and negative electrode sheets (not individually numbered) stacked in the thickness direction Z of the laminate 110.

[0029] The laminate body 110 may have a first surface 125 and a second surface 126 (also referred to as a first large surface and a second large surface, respectively) that are opposite to each other in the thickness direction Z. The laminate body 110 may also have a first side surface 121 and a second side surface 122 that are opposite to each other in the first direction X, and a third side surface 123 and a fourth side surface 124 that are opposite to each other in the second direction Y. The first direction X, the second direction Y, and the thickness direction Z may be perpendicular to each other.

[0030] The electrode assembly 100A may further include a first adhesive structure 131A. The first adhesive structure 131A is continuously disposed on the first side surface 121, the first surface 125, and the second side surface 122. Figure 2AIn the embodiment, two first adhesive structures 131A are taken as an example. In some other embodiments, the first adhesive structures 131A may be other numbers, and the number of the first adhesive structures 131A may be one or more than two, which is not limited in the present application.

[0031] The electrode assembly 100A may further include a second adhesive structure 132A. The second adhesive structure 132A is continuously disposed on a portion of the first surface 125, one of the third side surface 123 and the fourth side surface 124, and a portion of the second surface 126. Figure 2A In the embodiment, six second adhesive structures 132A are taken as an example. Three of the six second adhesive structures 132A are bonded to the third side surface 123 , and the other three are bonded to the fourth side surface 124 .

[0032] In some embodiments, the first adhesive structure 131A and the second adhesive structure 132A are both insulated. In some embodiments, the first adhesive structure 131A and the second adhesive structure 132A can be adhesive tapes, respectively. In some other embodiments, the first adhesive structure 131A and the second adhesive structure 132A can also be other structures that can be used for bonding.

[0033] In the above technical scheme, by using the first adhesive structure 131A to bond to the first side 121, the first surface 125 and the second side 122 of the stack body 110, and using the second adhesive structure 132A to bond to the third side 123 and / or the fourth side 124, the stack body 110 can be subjected to uniform force during the production process (for example, during the transfer process after hot pressing), thereby ensuring that the stack body has good flatness during the production process, avoiding cracks and gaps in the stack body due to uneven force, reducing the defective rate of the stack body in the production of the electrode assembly, and thus reducing the defective rate of the electrode assembly production.

[0034] In some embodiments, the electrode assembly 100A has a first pole ear 112 and a second pole ear 114 at the first side 121 and the second side 122, respectively, and the first pole ear 112 and the second pole ear 114 are arranged opposite to each other in the first direction X. In some embodiments, the two first adhesive structures 131A are arranged on opposite sides of the first pole ear 112 and the second pole ear 114 in the second direction Y. In some embodiments, the laminate body 110 may have a central axis L1 extending in the first direction X, and the two first adhesive structures 131A may be symmetrically arranged relative to the central axis L1. In some embodiments, the distances between the two first adhesive structures 131A and the central axis L1 may be the same. In some other embodiments, the distances between the two first adhesive structures 131A and the central axis L1 may be different.

[0035] In some other embodiments, any other number of first adhesive structures 131A may be arranged on both sides of the first pole tab 112 and the second pole tab 114. In some other embodiments, any number of first adhesive structures 131A may be arranged only on either side of the first pole tab 112 and the second pole tab 114. In some other embodiments, the number of first adhesive structures 131A on both sides of the first pole tab 112 and the second pole tab 114 may be different.

[0036] exist Figure 2A In the illustrated embodiment, the first direction X is the length direction of the laminate 110, and the second direction Y is the width direction of the laminate 110. In some other embodiments, the first direction X may be the width direction of the laminate 110, and the second direction Y may be the length direction of the laminate 110. Figure 2A In the embodiment, by providing a first adhesive structure 131A continuously bonded to the first side surface 121, the first surface 125 and the second side surface 122, it is helpful to maintain the tightness of the laminate body 110 in the first direction X (length direction) and to prevent the laminate body 110 from cracking in the first direction X (length direction).

[0037] In some embodiments, an outer edge 131Ae of at least one first adhesive structure 131A may be flush with the corresponding third side surface 123 or fourth side surface 124. Figure 2A In the embodiment, the outer edges 131Ae of the two first adhesive structures 131A can be flush with the third side surface 123 and the fourth side surface 124. By setting the outer edges 131Ae of the first adhesive structures 131A to be flush with the corresponding third side surface 123 and the fourth side surface 124, the tightness of the laminate 110 at the third side surface 123 and the fourth side surface 124 can be ensured, and cracking of the laminate 110 at the third side surface 123 and the fourth side surface 124 can be avoided.

[0038] In some embodiments, on the first surface 125 provided with the first adhesive structure 131A, the second adhesive structure 132A at least partially overlaps the first adhesive structure 131A above the first surface 125. By at least partially overlapping the second adhesive structure 132A with the first adhesive structure 131A on the first surface 125, the second adhesive structure 132A is bonded to the first adhesive structure 131A, which is beneficial to maintain the compactness of the laminate and ensure that the laminate is evenly stressed.

[0039] exist Figure 2AIn the embodiment, the end 132G of the second adhesive structure 132A on the first surface 125 can be flush with the edge 131Ad of the first adhesive structure 131A away from the third side surface 123. By setting the end 132G of the second adhesive structure 132A to be flush with the edge 131Ad of the first adhesive structure 131A, the bonding area between the second adhesive structure 132A and the first adhesive structure 131A can be made large enough to maintain the compactness of the laminate and ensure that the laminate is evenly stressed.

[0040] In some other embodiments, the end 132G of the second adhesive structure 132A may be located between the edge 131Ad and the outer edge 131Ae of the first adhesive structure 131A. In some other embodiments, the end 132G of the second adhesive structure 132A may extend beyond the edge 131Ad of the first adhesive structure 131A and be located on the first surface 125.

[0041] In some embodiments, the second adhesive structure 132A includes a second adhesive structure 132A on the third side 123, and a second adhesive structure 132A on the fourth side 124. A plurality of second adhesive structures 132A may be arranged at intervals on the corresponding third side 123 and fourth side 124. In some embodiments, the number of the second adhesive structures 132A on the third side 123 may be the same as the number of the second adhesive structures 132A on the fourth side. The (e.g., three) second adhesive structures 132A on the third side 123 and the (e.g., three) second adhesive structures 132A on the fourth side 124 are arranged relative to each other in the second direction Y, and may be aligned accordingly along the second direction Y and spaced apart from each other.

[0042] In some other embodiments, the second adhesive structures 132A on the third side 123 may be offset (not aligned) from the second adhesive structures 132A on the fourth side 124 in the second direction Y. When the second adhesive structures 132A on the third side 123 and the fourth side 124 are offset from each other in the second direction Y, similar beneficial effects may be achieved as when they are aligned with each other. In some other embodiments, the number of the second adhesive structures 132A on the third side 123 may be different from the number of the second adhesive structures 132A on the fourth side.

[0043] In some embodiments, the width of the first adhesive structure 131A (the dimension in the second direction Y) can be, for example, (10±1) mm, that is, in the range of 9 mm-11 mm. The width of the second adhesive structure 132A (the dimension in the first direction X) can be, for example, (10±1) mm, that is, in the range of 9 mm-11 mm. In some other embodiments, the widths of the first adhesive structure 131A and the second adhesive structure 132A can also adopt other applicable values.

[0044] Figure 2B yes Figure 2A A schematic side view and a partially enlarged view of the electrode assembly 100A in the second direction Y. Figure 2B As shown, in this embodiment, on the third side 123, three second adhesive structures 132A are arranged at intervals along the first direction X. In some embodiments, along the first direction X, the distance D1 between one of the three second adhesive structures 132A on the third side 123 adjacent to the first side 121 and the first side 121 may be 0.15 times to 0.35 times the length of the laminate 110, the distance D2 between the middle second adhesive structure 132A of the three second adhesive structures 132A and the first side 121 may be 0.4 times to 0.6 times the length of the laminate 110, and the distance D3 between the second adhesive structure 132A adjacent to the second side 122 of the three second adhesive structures 132A and the first side 121 may be 0.65 times to 0.85 times the length of the laminate 110. In some embodiments, the plurality of second adhesive structures 132A on the third side 123 may be spaced apart at equal distances. In some embodiments, on the third side 123, the distance D1 between one of the three second adhesive structures 132A adjacent to the first side 121 and the first side 121 may be equal to the distance D4 between the second adhesive structure 132A adjacent to the second side 122 and the second side 122. In some embodiments, the second adhesive structure 132A on the fourth side 124 may be arranged in a manner similar to the second adhesive structure 132A on the third side 123, which will not be described again. In some other embodiments, any other applicable distance configuration may be used to arrange the second adhesive structures 132A on the third side 123 and the fourth side 124.

[0045] refer to Figure 2B Combined with Figure 2A As shown, in some embodiments, during production, each first adhesive structure 131A can be formed in the following manner: the first adhesive structure 131A is protected by adhesive starting from the edge 151e where the first side surface 121 and the second surface 126 intersect, and then bypassing the first side surface 121, the first surface 125, and the second side surface 122 in sequence, and stopping at the edge 152e where the second side surface 122 and the second surface 126 intersect.

[0046] Figure 3A It is a three-dimensional schematic diagram of an electrode assembly 100B according to another embodiment of the present application. Figure 3B yes Figure 3A Schematic side view of the electrode assembly 100B in the second direction Y. Figure 3C yes Figure 3A Schematic side view of the electrode assembly 100B in the first direction X.

[0047] FIG. 3A to FIG. 3C The laminate body 110 and the second adhesive structure 132A of the electrode assembly 100B can be the same as those in the above reference FIG. 2A to FIG. 2B Similar to what is described. And, FIG. 3A to FIG. 3C The electrode assembly 100B in the embodiment may have the above reference FIG. 2A to FIG. 2B The advantages described below are mainly described FIG. 3A to FIG. 3C The electrode assembly 100B and FIG. 2A to FIG. 2B The differences between the electrode assembly 100A.

[0048] refer to Figure 3A and Figure 3B As shown, in this embodiment, the first adhesive structure 131B is continuously disposed on the first side surface 121, the first surface 125, the second side surface 122, and the second surface 126, so as to surround the first side surface 121, the first surface 125, the second side surface 122, and the second surface 126. In some embodiments, in production, each first adhesive structure 131B can be formed in the following manner: the first adhesive structure 131B can be started from the edge 151e where the first side surface 121 and the second surface 126 intersect to perform adhesive protection, and then bypass the first side surface 121, the first surface 125, the second side surface 122, and the second surface 126 in sequence, and finally return to the edge 151e where the first side surface 121 and the second surface 126 intersect to stop.

[0049] In the electrode assembly 100B, by surrounding the first glue structure 131B around the first side surface 121, the first surface 125, the second side surface 122 and the second surface 126, the laminate body can be further maintained in good tightness and uniform force, ensuring that the laminate body has good flatness during the production process, avoiding gaps between the pole pieces, reducing the defective rate of the laminate body in the production of the electrode assembly, and reducing the defective rate of the electrode assembly production.

[0050] refer to Figure 3C As shown, the second adhesive structure 132A at least partially overlaps the first adhesive structure 131B on both the first surface 125 and the second surface 126. By at least partially overlapping the second adhesive structure 132A on both the first surface 125 and the second surface 126 with the first adhesive structure 131A, both ends of the second adhesive structure 132A are bonded to the first adhesive structure 131A, which is conducive to maintaining the compactness of the laminate and ensuring that the laminate is evenly stressed.

[0051] In some embodiments, the end of the second adhesive structure 132A on the first surface 125 and the end on the second surface 126 can be flush with the edge 131Ad of the first adhesive structure 131B. By setting the two ends of the second adhesive structure 132A to be flush with the edge 131Ad of the first adhesive structure 131B, the bonding area of ​​the second adhesive structure 132A and the first adhesive structure 131B can be large enough to maintain the compactness of the laminate and ensure that the laminate is evenly stressed.

[0052] In some embodiments, during production, the second adhesive structure 132A may be formed, for example, in the following manner: for example, for the second adhesive structure 132A to be bonded to the third side 123, the second adhesive structure 132A is adhesively bonded from the starting position 153 above the first surface 125, the starting position 153 may be (10±1) mm away from the third side 123, and the starting position 153 may coincide with the edge 132Ad of the first adhesive structure 131B, and then the second adhesive structure 132A bypasses the third side 123 and continues to be adhesively bonded on the second surface 126 until the end position 154 stops. The end position 154 may be (10±1) mm away from the third side 123, and the end position 154 may coincide with the edge 132Ad of the first adhesive structure 131B. In some embodiments, the second adhesive structure 132A on the fourth side 124 may be formed in a manner similar to the second adhesive structure 132A on the third side 123.

[0053] Figure 4A It is a three-dimensional schematic diagram of an electrode assembly 100C according to another embodiment of the present application. Figure 4B yes Figure 4A Schematic side view of the electrode assembly 100C in the first direction X. Figure 4A and Figure 4B The stack body 110 of the electrode assembly 100C can be the same as that in the above reference FIG. 2A to FIG. 2B The first adhesive structure 131B can be similar to the above reference FIG. 3A to FIG. 3C Similar to the description. And, Figure 4A and Figure 4B The electrode assembly 100C in the embodiment may have the above reference Figures 2A to 3C The advantages described below are mainly described Figure 4A and Figure 4B The difference between the electrode assembly 100C in FIG.

[0054] refer to Figure 4A and Figure 4BAs shown, in the electrode assembly 100C, the second adhesive structure 132B is continuously disposed on the first surface 125, the third side surface 123, the second surface 126 and the fourth side surface 124 to surround the first surface 125, the third side surface 123, the second surface 126 and the fourth side surface 124. In this embodiment, three second adhesive structures 132B are provided as an example. In some other embodiments, the second adhesive structure 132B can have any other number.

[0055] In the present embodiment, the three second adhesive structures 132B are arranged at intervals in the first direction X. Along the first direction X, the distance between a second adhesive structure 132B adjacent to the first side surface 121 among the three second adhesive structures 132B and the first side surface 121 may be 0.15 times to 0.35 times the length of the laminate body 110, the distance between the middle second adhesive structure 132B among the three second adhesive structures 132B and the first side surface 121 may be 0.4 times to 0.6 times the length of the laminate body 110, and the distance between the second adhesive structure 132B adjacent to the second side surface 122 among the three second adhesive structures 132B and the first side surface 121 may be 0.65 times to 0.85 times the length of the laminate body 110. In some embodiments, the plurality of second adhesive structures 132B may be spaced apart at equal distances. In some embodiments, the distance between one of the three second adhesive structures 132B adjacent to the first side 121 and the first side 121 may be equal to the distance between one of the three second adhesive structures 132B adjacent to the second side 122 and the second side 122 .

[0056] refer to Figure 4B As shown, in some embodiments, during production, each second adhesive structure 132B can be formed in the following manner: the second adhesive structure 132B can be adhesively protected starting from the first surface 125, and the starting position 155 of the adhesive can be (10±1) mm away from the third side surface 123, for example, the starting position 155 can coincide with the edge 132Bd of the first adhesive structure 131B away from the third side surface 123, and then the second adhesive structure 132B sequentially bypasses the third side surface 123, the second surface 126, the fourth side surface 124, the first surface 125, and continues to be adhesively protected until it returns to the starting position 155. That is, the end position is the same as the starting position 155.

[0057] In the electrode assembly 100C, by surrounding the first surface 125, the third side 123, the second surface 126 and the fourth side 124 with the second glue structure 132B, the force on the laminate can be further evenly distributed, ensuring that the laminate has good flatness during the production process, avoiding gaps between the pole pieces, and reducing the defective rate of the laminate in the production of the electrode assembly.

[0058] In other embodiments, Figure 4A and Figure 4B The second adhesive structure 132B in the reference FIG. 2A to FIG. 2B The described first adhesive structure 131A is used in combination.

[0059] In some embodiments, the embodiments of the present application further provide a battery, which may include an electrode assembly (eg, electrode assembly 100A, 100B, 100C) described in any of the above embodiments. In some embodiments, the battery may be a lithium-ion battery.

[0060] In summary, at least one first adhesive structure 131A or 131B is used to bond at least to the first side 121, the first surface 125, and the second side 122 of the laminate 110, and at least one second adhesive structure 132A or 132B is used to bond to the third side 123 and / or the fourth side 124, so that the laminate is subjected to uniform force on each side during the production process (for example, during the transfer process after hot pressing), ensuring that the laminate has good flatness during the production process, avoiding the occurrence of gaps between the pole pieces, reducing the defective rate of the laminate in the production of the electrode assembly, and thus reducing the defective rate of the electrode assembly production. In some embodiments, the first side 121 and the second side 122 are opposite sides in the length direction of the laminate, which can help maintain the compactness of the laminate in the length direction and avoid cracking of the laminate in the length direction. In some embodiments, by setting the outer edge of at least one first adhesive structure 131A or 131B to be flush with the corresponding third side 123 or fourth side 124, the compactness of the laminate at the third side 123 and the fourth side 124 can be ensured, and cracks and gaps in the laminate at the third side 123 and the fourth side 124 can be avoided. In some embodiments, by at least partially overlapping the second adhesive structure 132A with the first adhesive structure 131A, 131B to be bonded to the first adhesive structure 131A, 131B, it is helpful to maintain the compactness of the laminate and ensure that the laminate is evenly stressed. In some embodiments, by aligning the end of the second adhesive structure 132A with the corresponding edge of the first adhesive structure 131A, 131B, the corresponding bonding area of ​​the second adhesive structure 132A and the first adhesive structure 131A, 131B can be made large enough to maintain the compactness of the laminate and ensure that the laminate is evenly stressed.

[0061] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An electrode assembly, characterized in that: include: A laminate body, comprising a positive electrode sheet, a separator and a negative electrode sheet stacked in a thickness direction of the laminate body, wherein the laminate body has a first surface and a second surface opposite to each other in the thickness direction, has a first side surface and a second side surface opposite to each other in a first direction perpendicular to the thickness direction, and has a third side surface and a fourth side surface opposite to each other in a second direction perpendicular to the thickness direction and the first direction; A first adhesive structure is continuously disposed on the first side surface, the first surface, and the second side surface; The second adhesive structure is continuously disposed on at least a portion of the first surface, one of the third side surface and the fourth side surface, and at least a portion of the second surface.

2. The electrode assembly according to claim 1, characterized in that: The second adhesive structure at least partially overlaps the first adhesive structure on the first surface.

3. The electrode assembly according to claim 1, characterized in that: The first adhesive structure is further continuously disposed on the second surface, thereby surrounding the first side surface, the first surface, the second side surface and the second surface.

4. The electrode assembly according to claim 3, characterized in that: The second adhesive structure overlaps the first adhesive structure on both the first surface and the second surface.

5. The electrode assembly according to claim 3, characterized in that: An end of the second adhesive structure is flush with an edge of the first adhesive structure away from the one of the third side surface and the fourth side surface.

6. The electrode assembly according to claim 3, characterized in that: An outer edge of the first adhesive structure is flush with the one of the third side surface and the fourth side surface.

7. The electrode assembly according to claim 1 or 3, characterized in that: The second adhesive structure is continuously disposed on the first surface, the one of the third side surface and the fourth side surface, the second surface, and the other of the third side surface and the fourth side surface to surround the first surface, the third side surface, the second surface, and the fourth side surface.

8. The electrode assembly according to claim 1, characterized in that: The second adhesive structure includes a second adhesive structure located on the third side and a second adhesive structure located on the fourth side, wherein the second adhesive structure located on the third side and the second adhesive structure located on the fourth side are offset from each other in the second direction.

9. The electrode assembly according to claim 1, characterized in that: The electrode assembly has a first electrode tab and a second electrode tab at the first side surface and the second side surface, respectively.

10. A battery, characterized in that: An electrode assembly comprising any one of claims 1-9.

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