Secondary battery and battery pack

Abstract

The utility model discloses a secondary battery and a battery pack, and belongs to the technical field of batteries, the secondary battery comprises a shell, an electrode assembly and an insulating sheet, the shell is provided with an accommodating cavity; the electrode assembly is arranged in the accommodating cavity and has a length direction and a width direction which are intersected; the insulating sheet comprises a first coating part, a second coating part and a first connecting part, the first coating part is connected with the second coating part, and the first coating part and the second coating part are arranged on the two sides of the electrode assembly in the width direction; the first connecting part is connected with the first coating part, the first connecting part extends in the width direction and is connected with the side, away from the electrode assembly, of the second coating part, the side, facing the second coating part, of the first connecting part is provided with a first bonding layer, and the first bonding layer is connected with the second coating part. Through the arrangement of the first connecting part and the first bonding layer, the insulating sheet can be conveniently installed and fixed outside the electrode assembly through the first bonding layer, the insulating sheet does not need to be independently fixed by using a binding adhesive tape, and the difficulty of installing the insulating sheet of the secondary battery is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a secondary battery and a battery pack. BACKGROUND

[0002] A secondary battery can be charged and recycled, and can continue to be used by activating active substances through charging after the battery is discharged.

[0003] An insulating sheet is arranged between an electrode assembly and a shell in a secondary battery, and the installation of the insulating sheet is relatively complex in the production of the existing secondary battery. CONTENT OF THE UTILITY MODEL

[0004] The utility model provides a secondary battery, which is used to solve the technical problem that the installation of the insulating sheet is relatively complex in the production of the secondary battery, and another object of the application is to provide a battery pack.

[0005] Technical scheme, the application provides a secondary battery, which comprises:

[0006] A shell, the shell has a containing cavity;

[0007] An electrode assembly, the electrode assembly is arranged in the containing cavity, and the electrode assembly has intersecting length and width directions;

[0008] An insulating sheet, the insulating sheet comprises a first cladding part, a second cladding part and a first connecting part, the first cladding part and the second cladding part are connected, and the first cladding part and the second cladding part are arranged on both sides of the electrode assembly along the width direction;

[0009] The first connecting part is connected with the first cladding part, the first connecting part extends along the width direction and is connected with one side of the second cladding part away from the electrode assembly, a first adhesive layer is arranged on the side of the first connecting part facing the second cladding part, and the first adhesive layer is connected with the second cladding part.

[0010] In some embodiments, the insulating sheet further comprises a first bending part, the first bending part is connected with the first cladding part, the first bending part is arranged on both sides of the electrode assembly along the length direction, and the first connecting part is connected to one end of the first bending part away from the first cladding part; the insulating sheet further comprises a second bending part, the second bending part is connected with the second cladding part, the second bending part is arranged on both sides of the electrode assembly along the length direction and located on the side of the first bending part close to the electrode assembly.

[0011] In some embodiments, the electrode assembly further has a height direction, and the length direction, the width direction and the height direction intersect with each other;

[0012] The insulating sheet further comprises a third covering portion located on one side of the electrode assembly along the height direction and connected with the first and second covering portions respectively.

[0013] In some embodiments, the insulating sheet further comprises a second connecting portion connected with the third covering portion, the second connecting portion being arranged on one side of the second bending portion close to the electrode assembly along the length direction.

[0014] In some embodiments, the insulating sheet further comprises a second connecting portion connected with the third covering portion, the second connecting portion being connected on one side of the first bending portion away from the electrode assembly along the length direction.

[0015] In some embodiments, the second connecting portion is provided with a second adhesive layer on one side of the first bending portion, the second adhesive layer being connected with the first bending portion along the length direction.

[0016] In some embodiments, the second adhesive layer is arranged along the height direction.

[0017] In some embodiments, the secondary battery further comprises a top cover sheet connected with the shell and covering the accommodating cavity, the third covering portion being arranged on one side of the electrode assembly away from the top cover sheet along the height direction.

[0018] In some embodiments, the electrode assembly further has a height direction, the length direction, the width direction and the height direction intersecting with each other.

[0019] The insulating sheet comprises a plurality of first connecting portions arranged at intervals along the height direction.

[0020] Correspondingly, the application further provides a battery pack comprising the secondary battery as described in any one of the above embodiments.

[0021] Beneficial effects: compared with the prior art, the secondary battery provided by the embodiment of the application comprises a shell, an electrode assembly and an insulating sheet, the shell has a containing cavity; the electrode assembly is arranged in the containing cavity, and the electrode assembly has intersecting length and width directions; the insulating sheet comprises a first cladding part, a second cladding part and a first connecting part, the first cladding part is connected with the second cladding part, and the first cladding part and the second cladding part are arranged on both sides of the electrode assembly along the width direction; the first connecting part is connected with the first cladding part, extends along the width direction, and is connected with one side of the second cladding part away from the electrode assembly, one side of the first connecting part facing the second cladding part is provided with a first adhesive layer, and the first adhesive layer is connected with the second cladding part. The first connecting part and the first adhesive layer are arranged, and the insulating sheet can be conveniently fixed on the outside of the electrode assembly through the first adhesive layer, without the need of fixing the insulating sheet by a separate binding adhesive tape, so that the difficulty of fixing the insulating sheet in the secondary battery is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] The technical scheme and other beneficial effects of the application will be apparent from the following detailed description of the specific embodiments of the application in combination with the drawings.

[0023] Figure 1 A structure schematic diagram of the secondary battery provided by the embodiment of the application is shown in the figure.

[0024] Figure 2 A structure schematic diagram of the insulating sheet in the secondary battery provided by the embodiment of the application is shown in the figure.

[0025] Figure 3 Another angle structure schematic diagram of the insulating sheet in the secondary battery provided by the embodiment of the application is shown in the figure.

[0026] Figure 4 An expanded schematic diagram of the insulating sheet in the secondary battery provided by the embodiment of the application is shown in the figure.

[0027] Figure 5 A sectional view of the secondary battery provided by the embodiment of the application is shown in the figure.

[0028] Figure 6 A sectional view of another embodiment of the secondary battery provided by the embodiment of the application is shown in the figure.

[0029] Figure 7 A sectional view of another embodiment of the secondary battery provided by the embodiment of the application is shown in the figure.

[0030] Figure 8 A structure schematic diagram of another embodiment of the secondary battery provided by the embodiment of the application is shown in the figure.

[0031] 100 - housing, 110 - accommodating cavity, 200 - electrode assembly, 300 - top cover sheet, 400 - insulating sheet, 410 - insulating cavity, 420 - first covering portion, 422 - first bent portion, 430 - second covering portion, 432 - second bent portion, 440 - first connecting portion, 450 - first adhesive layer, 460 - second connecting portion, 470 - second adhesive layer, 480 - third covering portion. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0033] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. For a person of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In the description of the present application, the meaning of "multiple" is two or more than two, unless otherwise explicitly specified and limited. In addition, the terms "first", "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", "second" can be explicitly or implicitly included one or more features.

[0034] It should also be noted that in the drawings of the embodiments of the present application, the arrows marked X, Y and Z represent the first direction X, the second direction Y and the third direction Z, respectively. The description of the present application introduces the first direction X, the second direction Y and the third direction Z in order to more clearly express the relative position relationship involved in the present application. The first direction X, the second direction Y and the third direction Z are three relative directions intersecting with each other, rather than absolute directions. In actual application, the first direction X, the second direction Y and the third direction Z can point to any direction in space, as long as the intersection relationship of the two is maintained.

[0035] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application.

[0036] Secondary battery refers to a battery that can be charged and used repeatedly.

[0037] The insulating sheet 400 is arranged between the electrode assembly 200 and the shell 100 in the secondary battery, and the installation of the insulating sheet 400 is relatively complex in the production of the existing secondary battery.

[0038] In some optional embodiments, the insulating sheet 400 is shaped by attaching adhesive paper to the side of the insulating sheet 400 away from the electrode assembly 200 during the production of the secondary battery. However, the process of attaching the adhesive paper is relatively complex, and the adhesive paper may be separated from the insulating sheet 400 due to the influence of the electrolyte, thereby causing the risk of failure of the insulating sheet 400.

[0039] To solve the above technical problem that the installation of the insulating sheet 400 is relatively complex, an embodiment of the present application provides a secondary battery, please refer to Figure 1 , comprising a shell 100, an electrode assembly 200 and an insulating sheet 400, the shell 100 has a receiving cavity 110; the electrode assembly 200 is arranged in the receiving cavity 110, and the electrode assembly 200 has intersecting length direction X and width direction Y; please refer to Figure 2 and Figure 3 , the insulating sheet 400 comprises a first covering portion 420, a second covering portion 430 and a first connecting portion 440, the first covering portion 420 and the second covering portion 430 are connected, and the first covering portion 420 and the second covering portion 430 are arranged on both sides of the electrode assembly 200 along the width direction Y; the first connecting portion 440 is connected with the first covering portion 420, the first connecting portion 440 extends along the width direction Y and is connected with the side of the second covering portion 430 away from the electrode assembly 200, the side of the first connecting portion 440 facing the second covering portion 430 is provided with a first adhesive layer 450, and the first adhesive layer 450 is connected with the second covering portion 430.

[0040] In some embodiments, the first covering portion 420 and the second covering portion 430 are of an integrated structure, and the first covering portion 420 and the first connecting portion 440 are of an integrated structure. The first connecting portion 440 arranged integrally with the first covering portion 420 is not easy to be separated from the first covering portion 420, and the possibility of falling off of the first connecting portion 440 from the first covering portion 420 is relatively low, so that the use reliability of the secondary battery is relatively high. In some optional embodiments, the adhesive paper or the binding tape connected with the first covering portion 420 and the second covering portion 430 is easy to be separated from the first covering portion 420, and the use reliability of the secondary battery is not as high as that of the secondary battery using the insulating sheet 400 with the first covering portion 420 and the first connecting portion 440 integrally connected.

[0041] In the above embodiments, the first connecting portion 440 is arranged to connect the first covering portion 420 and the second covering portion 430, so as to reduce the possibility of the first covering portion 420 and the second covering portion 430 moving away from each other along the width direction Y, thereby achieving the positioning of the insulating sheet 400. Since the first connecting portion 440 is part of the insulating sheet 400, no other parts, such as adhesive paper or binding tape, are needed when the insulating sheet 400 is installed, thereby reducing the difficulty of installing the insulating sheet 400. At the same time, the first connecting portion 440, which is part of the insulating sheet 400, is not easy to separate from the first covering portion 420, thereby reducing the possibility of failure of the insulating sheet 400 and improving the reliability of the secondary battery.

[0042] In some embodiments, referring to Figure 2 , Figure 3 and Figure 4 , the insulating sheet 400 further comprises a first bending portion 422, the first bending portion 422 is connected to the first covering portion 420, the first bending portion 422 is arranged on both sides of the electrode assembly 200 along the length direction X, and the first connecting portion 440 is connected to one end of the first bending portion 422 away from the first covering portion 420.

[0043] In some embodiments, the first bending portion 422 and the first covering portion 420 are of an integral structure.

[0044] In some embodiments, the insulating sheet 400 comprises at least two first bending portions 422, and the at least two first bending portions 422 are located on both sides of the first covering portion 420 along the length direction X.

[0045] In some embodiments, each first bending portion 422 is connected to at least one first connecting portion 440.

[0046] In the above embodiments, the first bending portion 422 is arranged on one side of the electrode assembly 200 along the length direction X, so that the insulating sheet 400 has a better insulation effect on the electrode assembly 200, thereby improving the use reliability of the secondary battery.

[0047] In some embodiments, referring to Figure 2 , Figure 3 and Figure 4 , the insulating sheet 400 further comprises a second bending portion 432; the second bending portion 432 is connected to the second covering portion 430, the second bending portion 432 is arranged on both sides of the electrode assembly 200 along the length direction X, and is located on the side of the first bending portion 422 close to the electrode assembly 200.

[0048] In some embodiments, the second bending portion 432 and the second covering portion 430 are of an integral structure.

[0049] In some embodiments, the insulating sheet 400 comprises at least two second bending portions 432, which are located on both sides of the second covering portion 430 along the length direction X.

[0050] In some embodiments, along the width direction Y, the maximum size of the first bending portion 422 is greater than that of the electrode assembly 200; in other embodiments, please refer to Figure 2 and Figure 3 , the maximum size of the first bending portion 422 is less than that of the electrode assembly 200, and part of the first connecting portion 440 is also located on one side of the electrode assembly 200 along the length direction X.

[0051] In the above embodiments, by setting the second bending portion 432, the insulating effect of the insulating sheet 400 on one side of the electrode assembly 200 along the length direction X is better, and the use reliability of the secondary battery is further improved.

[0052] In some embodiments, please refer to Figure 4 , the electrode assembly 200 also has a height direction Z, and the length direction X, the width direction Y and the height direction Z intersect with each other; the insulating sheet 400 further comprises a third covering portion 480, which is located on one side of the electrode assembly 200 along the height direction Z and is connected with the first covering portion 420 and the second covering portion 430 respectively.

[0053] In some embodiments, the third covering portion 480 is an integral structure with the first covering portion 420 and the second covering portion 430.

[0054] In some embodiments, the first covering portion 420, the second covering portion 430 and the third covering portion 480 enclose an insulating cavity 410, and the electrode assembly 200 is arranged in the insulating cavity 410.

[0055] In the above embodiments, by setting the third covering portion 480 to insulate one side of the electrode assembly 200 along the height direction Z, the insulating effect of the insulating sheet 400 on the electrode assembly 200 is improved, thereby improving the use reliability of the secondary battery.

[0056] In some embodiments, please refer to Figure 3 , Figure 4 and Figure 5 , the insulating sheet 400 further comprises a second connecting portion 460, which is connected with the third covering portion 480, and the second connecting portion 460 is arranged on one side of the second bending portion 432 close to the electrode assembly 200 along the length direction X.

[0057] In the above embodiment, the second connecting portion 460 is arranged to further improve the insulation performance of the portion of the electrode assembly 200 on one side along the length direction X that is close to the third covering portion 480. Meanwhile, the second connecting portion 460 arranged on the side of the second covering portion 430 along the length direction X that is close to the electrode assembly 200 can be limited by the second bending portion 432, and the possibility of being flipped in the direction away from the electrode assembly 200 along the length direction X is low, thereby further reducing the possibility of failure of the insulation sheet 400, and further improving the use reliability of the secondary battery.

[0058] In some embodiments, referring to Figure 6 , the secondary battery further comprises a second adhesive layer 470 connected between the second connecting portion 460 and the second bending portion 432 along the length direction X.

[0059] In the above embodiment, the second adhesive layer 470 is arranged to reduce the possibility of separation of the second adhesive layer 470 and the second bending portion 432, thereby further reducing the possibility of failure of the insulation sheet 400, and further improving the use reliability of the secondary battery.

[0060] In some embodiments, referring to Figure 8 , the insulation sheet 400 further comprises a second connecting portion 460 connected with the third covering portion 480, and the second connecting portion 460 is connected on the side of the first bending portion 422 away from the electrode assembly 200 along the length direction X.

[0061] Specifically, the second connecting portion 460 is connected on the side of the first bending portion 422 away from the electrode assembly 200 along the length direction X.

[0062] In the above embodiment, the second connecting portion 460 is arranged to further improve the insulation performance of the portion of the electrode assembly 200 on one side along the length direction X that is close to the third covering portion 480. Meanwhile, the second connecting portion 460 arranged on the side of the second covering portion 430 along the length direction X that is close to the electrode assembly 200 can be limited by the second bending portion 432, and the possibility of being flipped in the direction away from the electrode assembly 200 along the length direction X is low, thereby further reducing the possibility of failure of the insulation sheet 400, and further improving the use reliability of the secondary battery.

[0063] In some embodiments, referring to Figure 7 , the second connecting portion 460 is provided with a second adhesive layer 470 on the side facing the first bending portion 422, and the second adhesive layer 470 is connected with the first bending portion 422 along the length direction X.

[0064] Specifically, the second adhesive layer 470 is connected on the side of the first bending portion 422 away from the electrode assembly 200 along the length direction X.

[0065] In the above embodiment, the second adhesive layer 470 is arranged to reduce the possibility of the second connecting portion 460 being separated from the first bending portion 422, thereby further reducing the possibility of the insulating sheet 400 failing and improving the use reliability of the secondary battery.

[0066] In some embodiments, referring again to Figure 7 , the second adhesive layer 470 is arranged on the side of the first bending portion 422 away from the electrode assembly 200, and between the first bending portion 422 and the second connecting portion 460.

[0067] Specifically, the second adhesive layer 470 is arranged on the side of the second bending portion 432 away from the electrode assembly 200, and connected between the second bending portion 432 and the second connecting portion 460.

[0068] In the above embodiment, the second adhesive layer 470 is arranged to reduce the possibility of the second connecting portion 460 being separated from the first bending portion 422, thereby further reducing the possibility of the insulating sheet 400 failing and improving the use reliability of the secondary battery.

[0069] In some embodiments, referring to Figure 2 , Figure 3 and Figure 4 , the electrode assembly 200 further has a height direction Z, and the length direction X, the width direction Y and the height direction Z intersect with each other; and the insulating sheet 400 includes a plurality of first connecting portions 440, and the plurality of first connecting portions 440 are arranged at intervals along the height direction Z.

[0070] In some embodiments, each first bending portion 422 is connected to a plurality of first connecting portions 440. In some embodiments, the number of first connecting portions 440 connected by each first bending portion 422 is equal.

[0071] In the above embodiment, the plurality of first connecting portions 440 can increase the stability of the insulating sheet 400, thereby reducing the possibility of the insulating sheet 400 failing and improving the use reliability of the secondary battery.

[0072] In some embodiments, referring to Figure 1 and Figure 4 , the secondary battery further includes a top cover sheet 300, the top cover sheet 300 is connected to the shell 100 and covers the accommodation cavity 110, and the third covering portion 480 is arranged on the side of the electrode assembly 200 away from the top cover sheet 300 along the height direction Z.

[0073] In the above embodiments, the third covering portion 480 disposed on the side of the electrode assembly 200 away from the top cover sheet 300 in the height direction Z can cover the electrode assembly 200 while connecting the first covering portion 420 and the second covering portion 430, thereby improving the area of the insulating sheet 400 covering the electrode assembly 200, improving the insulation effect of the insulating sheet 400, and further improving the reliability of the secondary battery. In addition, the third covering portion 480 disposed on the side of the electrode assembly 200 away from the top cover sheet 300 in the height direction Z can avoid interference with the top cover sheet 300, further reducing the difficulty of installing the insulating sheet 400 during production of the secondary battery. The third covering portion 480 can insulate the bottom of the electrode assembly 200. The top of the insulating layer can be heat-fused to the top cover sheet 300.

[0074] Accordingly, the application also provides a battery pack, comprising the secondary battery according to any one of the above embodiments.

[0075] The above describes in detail a secondary battery and a battery pack provided by the embodiments of the application. The principles and implementation manners of the application are described by using specific examples. The above descriptions of the embodiments are only used to help understand the technical solutions of the application and the core ideas thereof. Those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application.

Claims

1. A secondary battery characterized by comprising: The secondary battery comprises: a housing having a receiving cavity; an electrode assembly disposed in the receiving cavity, the electrode assembly having a length direction and a width direction intersecting each other; an insulation sheet comprising a first wrapping portion, a second wrapping portion, and a first connecting portion, the first wrapping portion and the second wrapping portion being connected, the first wrapping portion and the second wrapping portion being disposed on two sides of the electrode assembly along the width direction; the first connecting portion being connected with the first wrapping portion, the first connecting portion extending along the width direction and being connected with one side of the second wrapping portion away from the electrode assembly, the first connecting portion being provided with a first adhesive layer on one side facing the second wrapping portion, the first adhesive layer being connected with the second wrapping portion.

2. The secondary battery according to claim 1, characterized by The insulation sheet further comprises a first bending portion, the first bending portion being connected with the first wrapping portion, the first bending portion being disposed on two sides of the electrode assembly along the length direction, and the first connecting portion being connected with one end of the first bending portion away from the first wrapping portion; the insulation sheet further comprises a second bending portion, the second bending portion being connected with the second wrapping portion, the second bending portion being disposed on two sides of the electrode assembly along the length direction and being located on one side of the first bending portion close to the electrode assembly.

3. The secondary battery according to claim 2, wherein: the electrode assembly further has a height direction, the length direction, the width direction, and the height direction intersecting each other; the insulation sheet further comprises a third wrapping portion, the third wrapping portion being located on one side of the electrode assembly along the height direction and being connected with the first wrapping portion and the second wrapping portion respectively.

4. The secondary battery according to claim 3, characterized by the insulation sheet further comprises a second connecting portion, the second connecting portion being connected with the third wrapping portion, the second connecting portion being disposed on one side of the second bending portion close to the electrode assembly along the length direction.

5. The secondary battery according to claim 3, characterized by the second connecting portion being connected with one side of the first bending portion away from the electrode assembly along the length direction.

6. The secondary battery according to claim 5, characterized by the second connecting portion being provided with a second adhesive layer on one side facing the first bending portion, the second adhesive layer being connected with the first bending portion along the length direction.

7. The secondary battery according to claim 6, characterized by the second adhesive layer extending along the height direction.

8. The secondary battery according to claim 3, characterized by The secondary battery further comprises a top cover sheet, the top cover sheet being connected with the housing and sealing the receiving cavity, and the third wrapping portion being disposed on one side of the electrode assembly away from the top cover sheet along the height direction.

9. The secondary battery according to claim 1, wherein: the electrode assembly further has a height direction, the length direction, the width direction, and the height direction intersecting each other; the insulation sheet comprises a plurality of first connecting portions, the plurality of first connecting portions being disposed at intervals along the height direction.

10. A battery pack, characterized by, The secondary battery comprises any one of claims 1-9.

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