Battery assembly and terminal equipment

Abstract

The invention discloses a battery assembly and terminal equipment. The battery assembly comprises a battery cell, a wrapping film and a first adhesive layer. The battery cell comprises a bottom wall, a top wall and a side wall, the top wall and the bottom wall are connected to the two ends of the side wall in the first direction respectively, and the first direction is the thickness direction of the battery cell. The wrapping film comprises a bottom, a top and a side, the top wraps the top wall, the bottom wraps the bottom wall, and the side wraps the side wall. The first adhesive layer is located between the battery cell and the wrapping film, the first adhesive layer comprises a first adhesive part, the first adhesive part is arranged between the top and the top wall and adheres to the top and the top in the first direction, the first adhesive layer is separated from the bottom and the bottom wall, and the bottom wall is in direct contact with the bottom. In the battery assembly, the top wall of the battery cell is adhered to the top of the wrapping film through the first glue part, and the bottom wall of the battery cell is in direct contact with the bottom of the wrapping film, so that the efficiency of disassembling the battery cell is higher, and the bottom and the bottom wall are not adhered, so that the acting force acting on the battery cell when the battery cell and the wrapping film are separated can be reduced.

Description

Technical Field

[0001] The present application belongs to the field of energy storage technology, and in particular relates to a battery assembly and a terminal device. Background Art

[0002] At present, when a battery cell is loaded into the battery compartment of a terminal device, it is usually necessary to wrap a layer of wrapping film on the outside of the battery cell. The wrapping film is bonded to the battery cell as a whole, and the wrapping film is bonded to the battery compartment, so as to achieve a stable connection between the battery cell and the battery compartment. When removing the battery cell, it is necessary to take the wrapping film out of the battery compartment together with the battery cell, and then separate the wrapping film from the battery cell. The efficiency of disassembling the battery cell is low, and the battery cell is easily bent during the separation of the wrapping film from the battery cell, causing safety risks. Summary of the invention

[0003] In view of the above situation, it is necessary to provide a battery assembly that can improve the efficiency of separating the battery cell from the battery compartment.

[0004] The first aspect of an embodiment of the present application provides a battery assembly, which includes a battery cell, a wrapping film and a first adhesive layer. The battery cell includes a bottom wall, a top wall and a side wall, and the top wall and the bottom wall are respectively connected to the two ends of the side wall along a first direction, and the first direction is the thickness direction of the battery cell. The wrapping film includes a bottom, a top and a side, the top covers the top wall, the bottom covers the bottom wall, and the side covers the side wall. The first adhesive layer is located between the battery cell and the wrapping film, and the first adhesive layer includes a first adhesive portion. Along the first direction, the first adhesive portion is arranged between the top and the top wall and adheres the top wall and the top, the first adhesive layer is separated from the bottom and the bottom wall, and the bottom wall directly contacts the bottom.

[0005] In this battery assembly, the top wall of the battery cell is bonded to the top of the wrapping film through the first adhesive portion, and the bottom wall of the battery cell is in direct contact with the bottom of the wrapping film, that is, there is no adhesive force between the bottom wall of the battery cell and the bottom of the wrapping film. When it is necessary to separate the battery cell from the wrapping film, compared with the solution in the prior art that the battery cell needs to be disassembled by pulling up the handle of the wrapping film to pull up the entire battery cell, and then separating the handle of the wrapping film from the battery cell, the embodiment of the present application separates the top wall of the battery cell from the top of the wrapping film when disassembling the battery. Since the bottom of the wrapping film is not bonded to the bottom wall of the battery cell, the battery cell can be disassembled by inverting the battery compartment, which is conducive to taking out the battery cell while the wrapping film and the battery compartment remain bonded. Therefore, the efficiency of disassembling the battery cell is higher, and since the bottom of the wrapping film is not bonded to the bottom wall of the battery cell, it is conducive to reducing the force acting on the battery cell when separating the battery cell from the wrapping film, thereby improving the safety of disassembling the battery assembly.

[0006] The second aspect of the embodiment of the present application provides another battery assembly, which includes a battery cell, a wrapping film and a first adhesive layer. The battery cell includes a bottom wall, a top wall and a side wall, and the top wall and the bottom wall are respectively connected to the two ends of the side wall along the first direction, and the first direction is the thickness direction of the battery cell. The wrapping film includes a bottom, a top and a side, the top covers the top wall, the bottom covers the bottom wall, and the side covers the side wall. The first adhesive layer is located between the battery cell and the wrapping film, and the first adhesive layer includes a first adhesive portion. Along the first direction, the first adhesive portion is arranged between the top and the top wall and adheres the top wall and the top. A second opening is opened at the bottom, and the second opening passes through the wrapping film along the second direction, and the second direction is perpendicular to the first direction; when observed along the first direction, part of the surface of the battery cell is exposed at the second opening. The first adhesive layer also includes a second adhesive portion, and along the first direction, the second adhesive portion is located between the bottom and the bottom wall.

[0007] In this battery assembly, the top wall of the battery cell is bonded to the top of the wrapping film through the first adhesive portion, and the bottom of the wrapping film begins to have a second opening, which reduces the bonding area between the bottom and the bottom wall compared to the prior art, that is, reduces the bonding force between the bottom and the bottom wall. When it is necessary to separate the battery cell from the wrapping film, compared to the prior art solution that requires pulling up the handle of the wrapping film to pull up the entire battery assembly 1, and then separating the handle of the wrapping film from the battery cell, the embodiment of the present application separates the top wall of the battery cell from the top of the wrapping film when disassembling the battery. Since the bonding force between the bottom of the wrapping film and the bottom wall of the battery cell is smaller than that of the prior art, the battery cell can be disassembled by inverting the battery compartment, which is conducive to taking out the battery cell while the wrapping film and the battery compartment remain bonded. Therefore, the efficiency of disassembling the battery cell is higher, and since the bonding force between the bottom of the wrapping film and the bottom wall of the battery cell is smaller than that of the prior art, it is conducive to reducing the force acting on the battery cell when separating the battery cell from the wrapping film, thereby improving the safety of disassembling the battery assembly. Furthermore, the second adhesive portion bonds the bottom to the bottom wall, so that when the battery assembly is placed in the battery compartment, the bottom is not easily separated from the bottom wall and wrinkles are generated, which is beneficial to improving the connection quality between the battery assembly and the battery compartment.

[0008] In one or more embodiments of the present application, a first opening is provided at the top, and the battery cell is exposed at the first opening when viewed along the first direction. The first opening is provided so that the battery cell has space to expand along the first direction, which is conducive to reducing the possibility of damage to the wrapping film due to the expansion of the battery cell; and when it is necessary to separate the wrapping film from the battery cell, an external force can act on the edge of the first opening, for example, an operator applies force at the edge of the first opening to separate the top and the top wall, which is conducive to improving the efficiency of separating the wrapping film and the battery cell.

[0009] In one or more embodiments of the present application, the top includes a plurality of stop portions, the stop portions are connected to the side portions, and when viewed along the first direction, the stop portions cover a portion of the top wall, and the plurality of stop portions surround the first opening; the first glue portion is disposed between each stop portion and the top wall.

[0010] In one or more embodiments of the present application, the stopper includes a handle area, and when viewed along the first direction, the handle area is separated from the first adhesive layer, and the edge of the handle area is connected to the first opening. In this way, when connecting the battery cell and the wrapping film, the stopper can be in an open state, so that the battery cell is easily placed in the wrapping film, and then the stopper is bonded to the battery cell, which is beneficial to improve the efficiency of connecting the wrapping film and the battery cell.

[0011] In one or more embodiments of the present application, the top includes a first main body and a first chamfered portion, and the first chamfered portion connects the first main body and the side. The top wall includes a second main body and a second chamfered portion, and the second chamfered portion connects the second main body and the side wall. Along the first direction, the projection of the first main body overlaps with the projection of the second main body, and the projection of the first chamfered portion overlaps with the projection of the second chamfered portion. The first adhesive portion bonds the first main body and the second main body, and the first adhesive portion bonds the first chamfered portion and the second chamfered portion.

[0012] In one or more embodiments of the present application, the first adhesive layer is separated from the side portion and the side wall, and the side portion directly contacts the side wall. In this way, the side portion and the side wall are not bonded, which is conducive to further improving the efficiency of separating the battery cell and the wrapping film.

[0013] A third aspect of an embodiment of the present application provides a terminal device, which includes a battery compartment and a battery assembly as described in any of the aforementioned embodiments, wherein the battery assembly is accommodated in the battery compartment, and a first gap is provided between the side portion and the battery compartment; the terminal device includes a second adhesive layer, which is located in the first gap and bonds the side portion to the battery compartment.

[0014] In this terminal device, the terminal device bonds the battery assembly to the battery compartment by setting a second adhesive layer between the side and the battery compartment. Due to the structural design of the battery assembly, when the battery cell needs to be taken out of the battery compartment, it is only necessary to release the connection between the top and the top wall, and the battery compartment can be turned upside down to take out the battery cell, which is beneficial to improve the efficiency of separating the battery cell from the battery compartment; and, because the bonding force between the battery cell and the wrapping film in the battery assembly is smaller than that in the prior art, the force required to remove the battery cell from the battery compartment is also smaller, which is beneficial to improve the safety of the disassembly process.

[0015] In one or more embodiments of the present application, the battery compartment includes a first wall, the second adhesive layer is separated from the bottom, and the bottom directly contacts the first wall, which is beneficial to reduce the thickness of the battery compartment along the first direction and reduce space occupation.

[0016] In one or more embodiments of the present application, the battery compartment further includes a second wall, the second wall is connected to and surrounds the first wall, the first wall and the second wall together form a second space, and the battery assembly is accommodated in the second space; the bottom directly contacts the first wall. The side portion includes a first sub-portion and a second sub-portion arranged opposite to each other along a third direction, and the second wall includes a first sub-wall and a second sub-wall arranged opposite to each other along a third direction; the third direction is the length direction or the width direction of the battery assembly. The second adhesive layer is located between the first sub-portion and the first sub-wall and bonds the first sub-portion and the first sub-wall, and the second adhesive layer is located between the second sub-portion and the second sub-wall and bonds the second sub-portion and the second sub-wall.

[0017] In one or more embodiments of the present application, the first sub-portion is smoothly connected to the bottom with a round chamfer, the second sub-portion is smoothly connected to the bottom with a round chamfer, and the second adhesive layer bonds the round chamfer and the battery compartment.

[0018] In one or more embodiments of the present application, the width of the second adhesive layer along the third direction is W1, 0.1mm≤W1≤0.3mm. When W1≥0.1mm is set, the width of the second adhesive layer is not too thin, and the width of the first gap is not too small, which is conducive to reducing the difficulty of setting the second adhesive layer; when W1≤0.3mm is set, the width of the second adhesive layer is not too thick, which is conducive to reducing the space occupied by the battery compartment.

[0019] In one or more embodiments of the present application, a second opening is provided at the bottom, and the second opening penetrates the wrapping film along a second direction, and the second direction is perpendicular to the first direction; when viewed along the first direction, part of the surface of the battery cell is exposed at the second opening. The terminal device includes a circuit board, and the circuit board is provided at the second opening. In this way, the total thickness of the battery assembly and the circuit board in the first direction is reduced, and the space occupied by the battery compartment is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of a battery assembly in one embodiment of the present application.

[0021] Figure 2 It is a schematic diagram of the structure of a battery cell in one embodiment of the present application.

[0022] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure at III-III in the figure.

[0023] Figure 4 yes Figure 2 Schematic diagram of the cross-sectional structure at IV-IV in the figure.

[0024] Figure 5 yes Figure 1 Schematic diagram of the cross-sectional structure at VV in the middle.

[0025] Figure 6 It is a schematic diagram of the structure of a wrapping film in one embodiment of the present application.

[0026] Figure 7 It is a schematic diagram of the cross-sectional structure of a battery assembly in one embodiment of the present application.

[0027] Figure 8 It is a schematic diagram of the structure of a wrapping film at a certain viewing angle in one embodiment of the present application.

[0028] Fig. 9 yes Figure 8 Schematic diagram of the structure of the wrapping film from another perspective.

[0029] Fig.10 It is a schematic diagram of the structure of a terminal device in an embodiment of the present application.

[0030] Fig.11 yes Fig.10 Schematic diagram of the cross-sectional structure at XI-XI in the figure.

[0031] Main component symbols 100, battery assembly; 10, battery cell; 11, shell; 111, bottom wall; 1111, third main body; 1112, third chamfered portion; 112, top wall; 1121, second main body; 1122, second chamfered portion; 113, side wall; 12, electrode assembly; 121, positive electrode sheet; 1211, positive electrode current collector; 1212, positive electrode active material layer; 122, negative electrode sheet; 1221, negative electrode current collector; 1222, negative electrode active material layer; 123, separator; 13, positive electrode ear; 131, first sub-electrode ear; 132, first transfer electrode ear; 14, negative electrode ear; 141, second sub-electrode ear; 142, second transfer electrode ear; 20, wrapping film; 21, bottom part; 211, fourth main body; 212, fourth chamfered part; 21a, second opening; 22, top; 221, stopper; 222, first main body; 223, first chamfered part; 221a, handle area; 22a, first opening; 23, side; 231, first sub-part; 232, second sub-part; 30, first adhesive layer; 31, first adhesive part; 32, second adhesive part; 200, battery compartment; 210, first wall; 220, second wall; 2201, first sub-wall; 2202, second sub-wall; 200a, first gap; 300, second adhesive layer; 400, circuit board; 1000, terminal device; X, first direction; Y, second direction; Z, third direction.

[0032] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described below in conjunction with 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 of the embodiments.

[0034] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a centrally disposed element at the same time. When an element is considered to be "disposed on" another element, it may be directly disposed on the other element or there may be a centrally disposed element at the same time. In this application, unless otherwise clearly specified and limited, the terms "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0036] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0037] In the description of the embodiments of the present application, the term "perpendicular" is used to describe an ideal state between two components. In actual production or use, there may be a state that is approximately perpendicular between the two components. The two components described as "perpendicular" may not be absolutely straight lines or planes, but may be roughly straight lines or planes. From a macroscopic point of view, if the overall extension direction is a straight line or a plane, the components can be considered to be "straight lines" or "planes".

[0038] The term "parallel" is used to describe the ideal state between two parts. In actual production or use, two parts may be approximately parallel. The two parts described as "parallel" may not be absolutely straight lines or planes, but may be roughly straight lines or planes. From a macroscopic point of view, if the overall extension direction is a straight line or a plane, the parts can be considered "straight" or "plane".

[0039] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. The various embodiments in the present application may be combined with each other in the absence of conflict.

[0040] In the accompanying drawings, a spatial rectangular coordinate system is established with the thickness direction of the battery assembly 100 as the first direction X, the length direction of the battery assembly 100 as the second direction Y, and the width direction of the battery assembly 100 as the third direction Z.

[0041] like Figure 1 As shown, an embodiment of the present application provides a battery assembly 100 , which includes a battery cell 10 and a wrapping film 20 . The wrapping film 20 covers a portion of the surface of the battery cell 10 .

[0042] In some embodiments, Figure 2 and Figure 3 As shown, the battery cell 10 includes a housing 11, an electrode assembly 12, a positive electrode ear 13 and a negative electrode ear 14. The electrode assembly 12 is accommodated in the housing 11 for storing or releasing electrical energy. The positive electrode ear 13 and the negative electrode ear 14 are both electrically connected to the electrode assembly 12, and part of the positive electrode ear 13 and part of the negative electrode ear 14 extend out of the housing 11. The positive electrode ear 13 and the negative electrode ear 14 are used to connect the battery cell 10 to an external load to form an electrical circuit.

[0043] In some embodiments, the housing 11 is a flexible packaging bag, such as an aluminum-plastic film. In other embodiments, the housing 11 is a hard shell, such as a plastic shell, or a metal shell including at least one of steel alloy, aluminum alloy, and copper alloy.

[0044] In some embodiments, Figure 3 As shown, the electrode assembly 12 includes a stacked positive electrode sheet 121, a negative electrode sheet 122 and a separator 123, wherein the separator 123 is located between the positive electrode sheet 121 and the negative electrode sheet 122 to insulate the positive electrode sheet 121 from the negative electrode sheet 122. The positive electrode sheet 121 is electrically connected to the positive electrode tab 13, and the negative electrode sheet 122 is electrically connected to the negative electrode tab 14.

[0045] In some embodiments, the positive electrode sheet 121 , the separator 123 , and the negative electrode sheet 122 are sequentially stacked and then wound to form a winding structure.

[0046] In some embodiments, a plurality of positive electrode sheets 121 , a separator 123 , and a plurality of negative electrode sheets 122 are alternately stacked to form a stacked structure.

[0047] In some embodiments, Figure 3As shown, the positive electrode sheet 121 includes a positive electrode current collector 1211 and a positive electrode active material layer 1212 , and the positive electrode active material layer 1212 is disposed on one or both sides of the positive electrode current collector 1211 along the thickness direction thereof.

[0048] In some embodiments, Figure 3 As shown, the negative electrode sheet 122 includes a negative electrode current collector 1221 and a negative electrode active material layer 1222 , and the negative electrode active material layer 1222 is disposed on one or both sides of the negative electrode current collector 1221 along the thickness direction thereof.

[0049] In some embodiments, both the positive electrode current collector 1211 and the negative electrode current collector 1221 are metal layers. As an illustrative example, the positive electrode current collector 1211 may be a metal layer including at least one of aluminum, nickel, tantalum, and titanium, such as aluminum foil. The negative electrode current collector 1221 may be a metal layer including at least one of copper, nickel, tantalum, and titanium, such as copper foil.

[0050] In some embodiments, the positive active material layer 1212 includes a positive active material, which includes at least one of lithium cobalt oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, lithium iron phosphate, lithium manganese iron phosphate, or lithium manganese oxide.

[0051] In some embodiments, the negative electrode active material layer 1222 includes a negative electrode active material, which includes at least one of graphite, hard carbon, soft carbon, silicon, silicon-oxygen material, and silicon-carbon material.

[0052] In some embodiments, the isolation film 123 is made of insulating film materials such as polyethylene film, polypropylene film, polyester film or polyimide film.

[0053] In some embodiments, the battery cell 10 further includes an electrolyte (not shown), and the electrolyte is filled in the shell 11 .

[0054] In some embodiments, the electrolyte includes an electrolyte salt. The electrolyte salt includes at least one of an organic lithium salt or an inorganic lithium salt.

[0055] In some embodiments, the electrolyte salt includes but is not limited to at least one of lithium hexafluorophosphate (LiPF6), lithium bis(trifluoromethanesulfonyl)imide LiN(CF3SO2)2 (LiTFSI), lithium bis(fluorosulfonyl)imide Li(N(SO2F)2) (LiFSI), lithium hexafluorocesium oxide (LiCsF6), lithium perchlorate (LiClO4) or lithium trifluoromethanesulfonate (LiCF3SO3).

[0056] In some embodiments, the positive electrode tab 13 is a metal sheet, such as an aluminum sheet.

[0057] In some embodiments, Figure 3As shown, the positive electrode tab 13 includes a first sub-tab 131 and a first adapter tab 132. Multiple first sub-tabs 131 are connected to the positive electrode sheet 121, and multiple first sub-tabs 131 are gathered into a first tab bundle along the thickness direction of the electrode assembly 12. The first adapter tab 132 is connected to the first tab bundle and extends out of the shell 11.

[0058] In some embodiments, the negative electrode tab 14 is a metal sheet, such as a nickel sheet.

[0059] In some embodiments, Figure 4 As shown, the negative electrode tab 14 includes a second sub-tab 141 and a second adapter tab 142 , a plurality of second sub-tabs 141 are connected to the negative electrode sheet 122 , and a plurality of second sub-tabs 141 are gathered into a second tab bundle along the thickness direction of the electrode assembly 12 , and the second adapter tab 142 is connected to the second tab bundle and extends out of the shell 11 .

[0060] In some embodiments, Figure 5 As shown, the battery cell 10 includes a bottom wall 111, a top wall 112 and a side wall 113, and the top wall 112 and the bottom wall 111 are respectively connected to two ends of the side wall 113 along the first direction X. The wrapping film 20 includes a bottom 21, a top 22 and a side portion 23, the top 22 covers the top wall 112, the bottom 21 covers the bottom wall 111, and the side portion 23 covers the side wall 113.

[0061] In some embodiments, Figure 5 As shown, the battery assembly 100 further includes a first adhesive layer 30 , and the first adhesive layer 30 bonds the battery cell 10 and the wrapping film 20 .

[0062] In some embodiments, Figure 5 and Figure 6 As shown, the first adhesive layer 30 is located between the battery cell 10 and the wrapping film 20, and the first adhesive layer 30 includes a first adhesive portion 31. Along the first direction X, the first adhesive portion 31 is arranged between the top 22 and the top wall 112 and adheres the top wall 112 and the top 22. The first adhesive layer 30 is separated from the bottom 21 and the bottom wall 111, and the bottom wall 111 directly contacts the bottom 21.

[0063] In this battery assembly, the top wall 112 of the battery cell 10 is bonded to the top 22 of the wrapping film 20 via the first adhesive portion 31 , and the bottom wall 111 of the battery cell 10 is in direct contact with the bottom 21 of the wrapping film 20 , that is, there is no adhesive force between the bottom wall 111 of the battery cell 10 and the bottom 21 of the wrapping film 20 . When it is necessary to separate the battery cell 10 from the wrapping film 20, compared with the prior art that the battery cell needs to be disassembled by pulling up the handle of the wrapping film 20 to pull up the entire battery assembly, and then separating the handle of the wrapping film 20 from the battery cell 10, in the embodiment of the present application, when disassembling the battery, the top wall 112 of the battery cell 10 is first separated from the top 22 of the wrapping film 20. Since the bottom 21 of the wrapping film 20 and the bottom wall 111 of the battery cell 10 are not bonded, the battery cell 10 can be disassembled by turning the battery compartment 200 upside down, which is conducive to taking out the battery cell 10 while the wrapping film 20 and the battery compartment 200 remain bonded. Therefore, the efficiency of disassembling the battery cell 10 is higher. Moreover, since the bottom 21 of the wrapping film 20 and the bottom wall 111 of the battery cell 10 are not bonded, it is conducive to reducing the force acting on the battery cell 10 when separating the battery cell 10 from the wrapping film 20, thereby improving the safety of disassembling the battery assembly.

[0064] In some embodiments, Figure 7 and Figure 8 As shown, the bottom 21 is provided with a second opening 21a, and the second opening 21a penetrates the wrapping film 20 along the second direction Y, and the second direction Y is perpendicular to the first direction X; when viewed along the first direction X, part of the surface of the battery cell 10 is exposed at the second opening 21a. The first glue layer 30 also includes a second glue portion 32, and along the first direction X, the second glue portion 32 is located between the bottom 21 and the bottom wall 111.

[0065] In this battery assembly, the top wall 112 of the battery cell 10 is bonded to the top 22 of the wrapping film 20 by the first adhesive portion 31, and the bottom 21 of the wrapping film 20 is provided with a second opening 21a. Compared with the prior art, the bonding area between the bottom 21 and the bottom wall 111 is reduced, which is conducive to reducing the bonding force between the bottom 21 and the bottom wall 111. When it is necessary to separate the battery cell 10 and the wrapping film 20, compared with the solution in the prior art that the battery cell 20 needs to be removed by pulling up the handle of the wrapping film 20 to pull up the entire battery assembly 100, and then separating the handle of the wrapping film 20 and the battery cell 10, in the embodiment of the present application, when disassembling the battery, the top wall 112 of the battery cell 10 is first separated from the top 22 of the wrapping film 20. Since the adhesion between the bottom of the wrapping film 20 and the bottom wall 11 of the battery cell 10 is smaller than that in the prior art, the battery cell 10 can be removed by turning the battery compartment 20 upside down, which is conducive to taking out the battery cell 10 while the wrapping film 20 and the battery compartment 200 remain adhered. Therefore, the efficiency of disassembling the battery cell 10 is higher. Moreover, since the adhesion between the bottom 21 of the wrapping film 20 and the bottom wall 111 of the battery cell 10 is smaller than that in the prior art, it is conducive to reducing the force acting on the battery cell 10 when separating the battery cell 10 from the wrapping film 20, thereby improving the safety of disassembling the battery assembly 100. Furthermore, the second adhesive portion 32 bonds the bottom 21 and the bottom wall 111 . When the battery assembly 100 is placed in the battery compartment 200 , the bottom 21 is unlikely to separate from the bottom wall 111 and generate wrinkles, which is beneficial to improving the connection quality between the battery assembly 100 and the battery compartment 200 .

[0066] In some embodiments, Figure 6 As shown, the top 22 is provided with a first opening 22a, and the battery cell 10 is exposed at the first opening 22a when viewed along the first direction X. The battery cell 10 is prone to expand along the first direction X after multiple cycles. By providing the first opening 22a, the battery cell 10 has space to expand along the first direction X, which is conducive to reducing the possibility of damage to the wrapping film 20 due to the expansion of the battery cell 10; and when it is necessary to separate the wrapping film 20 from the battery cell 10, an external force can act on the edge of the first opening 22a, for example, the operator applies force on the edge of the first opening 22a to separate the top 22 from the top wall 112, which is conducive to improving the efficiency of separating the wrapping film 20 and the battery cell 10.

[0067] In some embodiments, Figure 6As shown, the top 22 includes a plurality of stoppers 221, the stoppers 221 are connected to the side portions 23, and when viewed along the first direction X, the stoppers 221 cover a portion of the top wall 112, and the plurality of stoppers 221 surround the first opening 22a. The first adhesive portion 31 is disposed between each stopper 221 and the top wall 112. In this way, when connecting the battery cell 10 and the wrapping film 20, the stoppers 221 can be in an open state, so that the battery cell 10 is easily placed in the wrapping film 20, and then the stoppers 221 are bonded to the battery cell 10, which is beneficial to improve the efficiency of connecting the wrapping film 20 and the battery cell 10.

[0068] In some embodiments, Figure 6 As shown, the projections of two adjacent stoppers 221 along the first direction X are connected or separated. In other words, the two adjacent stoppers 221 do not overlap in the first direction X. This helps to reduce the thickness of the top 22 along the first direction X, so as to improve the energy density of the battery assembly 100.

[0069] In some embodiments, Figure 6 and Fig. 9 As shown, the stopper 221 includes a handle area 221a. When viewed along the first direction X, the handle area 221a is separated from the first adhesive layer 30, and the edge of the handle area 221a is connected to the first opening 22a. When the wrapping film 20 and the battery cell 10 need to be separated, an external force can act on the handle area 221a, and the stopper 221 is pulled up through the handle area 221a, so that the top 22 is separated from the battery cell 10. Therefore, the provision of the handle area 221a is conducive to improving the efficiency of separating the wrapping film 20 from the battery cell 10.

[0070] In some embodiments, Figure 5 and Figure 7 As shown, the first adhesive layer 30 is separated from the side portion 23 and the side wall 113. In this way, the side portion 23 and the side wall 113 are not bonded, which is beneficial to further improve the efficiency of separating the battery cell 10 and the wrapping film 20.

[0071] In some embodiments, Figure 5 and Figure 7 As shown, the side portion 23 directly contacts the side wall 113. This is beneficial to improve the fit between the wrapping film 20 and the battery cell 10, and improve the energy density of the battery assembly 100.

[0072] In some embodiments, Figure 5As shown, the top 22 includes a first main body 222 and a first chamfered portion 223, and the first chamfered portion 223 connects the first main body 222 and the side 23. The top wall 112 includes a second main body 1121 and a second chamfered portion 1122, and the second chamfered portion 1122 connects the second main body 1121 and the side wall 113. Along the first direction X, the projection of the first main body 222 overlaps with the projection of the second main body 1121, and the projection of the first chamfered portion 223 overlaps with the projection of the second chamfered portion 1122. The first adhesive portion 31 adheres the first main body 222 and the second main body 1121, and the first adhesive portion 31 adheres the first chamfered portion 223 and the second chamfered portion 1122. Among them, the first main body 222 and the second main body 1121 are flat areas, the extension direction of the first main body 222 and the second main body 1121 is perpendicular to the first direction X, the first chamfered portion 223 and the second chamfered portion 1122 are inclined surfaces or curved surfaces, the first chamfered portion 223 and the second chamfered portion 1122 extend along the second direction Y, and form an angle with the first direction X and the third direction Z. The above-mentioned flat area refers to an area that is nearly flat when observed with the naked eye, but it should be understood that the product cannot be made into an absolutely flat surface, and the above-mentioned flat area may also be uneven, or after the product has been used for a period of time, the middle part of the battery cell is more likely to expand, so it may present a surface that is high in the middle and low on both sides, but it still belongs to the flat area described in this application.

[0073] In some embodiments, Figure 5 As shown, the bottom wall 111 includes a third main body portion 1111 and a third chamfered portion 1112, the third chamfered portion 1112 connects the third main body portion 1111 and the side wall 113, the extension direction of the third main body portion 1111 is perpendicular to the first direction X, the second main body portion 1121 is substantially parallel to the third main body portion 1111, and the extension of the side wall 113 is perpendicular to the third direction Z.

[0074] In some embodiments, Figure 5 As shown, the bottom 21 includes a fourth main body portion 211 and a fourth chamfered portion 212, the fourth chamfered portion 212 connects the fourth main body portion 211 and the side portion 23, the extension direction of the fourth main body portion 211 is perpendicular to the first direction X, the first main body portion 222 is parallel to the fourth main body portion 211, and the extension direction of the side portion 23 is perpendicular to the third direction Z.

[0075] In some embodiments, the peeling force between the top 22 and the top wall 112 is F1, 1KGF / 24MM≤F1≤2KGF / 24MM. When F1≥1KGF / 24MM is set, the peeling force between the top 22 and the top wall 112 is not too small. When the battery assembly 100 falls, the battery cell 10 is not easy to escape from the wrapping film 20, which is conducive to reducing the possibility of damage to the battery cell 10; when F1≤2KGF / 24MM is set, the peeling force between the top 22 and the top wall 112 is not too large, which is conducive to reducing the difficulty of separating the top 22 from the top wall 112, and when the battery assembly 100 falls, the risk of the shell 11 of the flexible packaging bag being damaged due to relative movement with the top 22 (the two are disconnected when the relative displacement is too large) is reduced, which is conducive to reducing the possibility of electrolyte leakage.

[0076] In some embodiments, a second adhesive portion 32 is provided between the bottom 21 and the bottom wall 111, and the peeling force between the bottom 21 and the bottom wall 111 is F2, 0.1KGF / 24MM≤F2≤0.3KGF / 24MM. When F2≥0.1KGF / 24MM is set, the adhesive force between the bottom 21 and the bottom wall 111 is not too small, which is conducive to reducing the possibility of wrinkles caused by the separation of the bottom 21 and the bottom wall 111 during the process of setting the battery assembly 100 in the battery compartment 200; when F2≤0.3KGF / 24MM is set, the peeling force between the bottom 21 and the bottom wall 111 is not too large, which is conducive to reducing the difficulty of separating the wrapping film 20 and the battery cell 10.

[0077] It should be noted that the numerical ranges of F1 and F2 provided in the above content are only preferred numerical ranges obtained by the inventors in production practice, and are not limitations on the optional ranges of F1 and F2. For those skilled in the art, the numerical values ​​of F1 and F2 can still be determined according to product requirements (even if the numerical values ​​are outside the above ranges) to meet the needs of production and use.

[0078] Here, taking the top 22 and the top wall 112 as an example, a method for measuring the peeling force is provided for reference: discharge the battery cell 10 to 3.0V, then cut the top 22, the first glue part 31 and the top wall 112 as a whole, and wipe the electrolyte on the surface with dust-free paper. Then cut the top 22, the first glue part 31 and the top wall 112 into a strip sample along the first direction X. Along the length direction of the sample, the side of the top wall 112 in the sample where the first glue part 31 is not set is adhered and fixed to the steel plate with double-sided tape (Nitto 5000NS). After separating the top 22 and the top wall 112 at one end of the sample, a piece of test tape is bonded to one end of the top 22, so that the top 22 and the top wall 112 are bonded with a length of 60mm*width of 25mm. The steel plate is fixed at the corresponding position of the high-speed rail tensile machine, the test tape of the sample is pulled up, and it is clamped in the chuck, wherein the angle between the pulled up test tape and the steel plate in space is 180°, and the chuck pulls the sample at a speed of 5±0.2mm / s, and the average tensile force in the stable area is finally measured as the peel strength between the top 22 and the top wall 112. Among them, the stable area refers to the part in the figure where the tensile force of the top 22 pulled by the chuck over time does not change significantly over time after the change in the time of ...

[0079] The measurement of the peeling force between the bottom 21 and the bottom wall 111 can be referred to above and will not be repeated here.

[0080] In some embodiments, the material of the wrapping film 20 includes at least one of polyethylene terephthalate (PET) or polyimide (PI).

[0081] In some embodiments, the material of the first adhesive layer 30 includes acrylic pressure-sensitive adhesive.

[0082] like Fig.10 and Fig.11 As shown, the embodiment of the present application further provides a terminal device 1000, which includes a battery compartment 200 and a battery assembly 100 involved in any of the above embodiments, the battery assembly 100 is accommodated in the battery compartment 200, and a first gap 200a is provided between the side portion 23 and the battery compartment 200. The terminal device 1000 includes a second adhesive layer 300, which is located in the first gap 200a and adheres the side portion 23 and the battery compartment 200.

[0083] In this terminal device 1000, the terminal device 1000 sets a second adhesive layer 300 between the side 23 and the battery compartment 200 to bond the battery assembly 100 and the battery compartment 200. Due to the structural design of the battery assembly 100, when the battery cell 10 needs to be taken out of the battery compartment 200, it is only necessary to release the connection between the top 22 and the top wall 112, and turn the battery compartment 200 upside down to take out the battery cell 10, which is beneficial to improve the efficiency of separating the battery cell 10 and the battery compartment 200; and because the bonding force between the battery cell 10 and the wrapping film 20 in the battery assembly 100 is smaller than that in the prior art, the force required to remove the battery cell 10 from the battery compartment 200 is also smaller, which is beneficial to improve the safety of the disassembly process.

[0084] In some embodiments, Fig.11 As shown, the battery compartment 200 includes a first wall 210, the second adhesive layer 300 is separated from the bottom 21, and the bottom 21 directly contacts the first wall 210. In this way, the thickness of the battery compartment 200 along the first direction X is reduced, and the space occupied is reduced.

[0085] In some embodiments, Fig.11 As shown, the battery compartment 200 also includes a second wall 220, which is connected to and surrounds the first wall 210. The first wall 210 and the second wall 220 together form a second space, and the battery assembly 100 is accommodated in the second space. The bottom 21 directly contacts the first wall 210. The side portion 23 includes a first sub-portion 231 and a second sub-portion 232 that are relatively arranged along a third direction Z, and the second wall 220 includes a first sub-wall 2201 and a second sub-wall 2202 that are relatively arranged along a third direction Z; the third direction Z is the length direction or width direction of the battery assembly 100. The second adhesive layer 300 is located between the first sub-portion 231 and the first sub-wall 2201 and adheres the first sub-portion 231 and the first sub-wall 2201, and the second adhesive layer 300 is located between the second sub-portion 232 and the second sub-wall 2202 and adheres the second sub-portion 232 and the second sub-wall 2202.

[0086] It should be noted that, in some embodiments, the third direction Z and the second direction Y mentioned above may be the same direction or different directions. In the drawings of the present application, the two directions are set as different directions.

[0087] In some embodiments, Fig.11As shown, the width of the second adhesive layer 300 along the third direction Z is W1, 0.1mm≤W1≤0.3mm. When W1≥0.1mm is set, the width of the second adhesive layer 300 is not too thin, and the width of the first gap 200a is not too small, which is conducive to reducing the difficulty of setting the second adhesive layer 300; when W1≤0.3mm is set, the width of the second adhesive layer 300 is not too thick, which is conducive to reducing the space occupied by the battery compartment 200. It should be noted that when measuring the width of the second adhesive layer 300 along the third direction Z, the portion of the second adhesive layer 300 opposite to the side portion 23 along the third direction Z is used as the reference.

[0088] In some embodiments, the second glue layer 300 is formed by injecting liquid glue into the first gap 200 a and then curing it.

[0089] In some embodiments, the second adhesive layer 300 is one of moisture curing adhesive, anaerobic curing adhesive and hot melt adhesive.

[0090] In some embodiments, the second adhesive layer 300 is UV curing adhesive or UV-moisture dual curing adhesive.

[0091] In some embodiments, Fig.11 As shown, the bottom 21 is provided with a second opening 21a, and the second opening 21a penetrates the wrapping film 20 along the second direction Y, and the second direction Y is perpendicular to the first direction X. When viewed along the first direction X, part of the surface of the battery cell 10 is exposed at the second opening 21a. The terminal device 1000 includes a circuit board 400, and the circuit board 400 is disposed at the second opening 21a. In this way, the total thickness of the battery assembly 100 and the circuit board 400 in the first direction X is reduced, and the space occupied by the battery compartment 200 is reduced.

[0092] In some embodiments, the circuit board 400 is a flexible circuit board 400 (FPC).

[0093] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present application and are not intended to be limiting of the present application. As long as they are within the spirit and scope of the present application, appropriate changes and modifications to the above embodiments are within the scope of the present application.

Claims

1. A battery assembly, characterized in that: include: A battery cell, the battery cell comprising a bottom wall, a top wall and a side wall, the top wall and the bottom wall are respectively connected to two ends of the side wall along a first direction, and the first direction is a thickness direction of the battery cell; A wrapping film, the wrapping film comprising a bottom, a top and a side, the top covering the top wall, the bottom covering the bottom wall, and the side covering the side wall; A first adhesive layer, the first adhesive layer is located between the battery cell and the wrapping film, the first adhesive layer includes a first adhesive portion, along the first direction, the first adhesive portion is arranged between the top and the top wall and adheres the top wall and the top, the first adhesive layer is separated from the bottom and the bottom wall, and the bottom wall directly contacts the bottom.

2. A battery assembly, characterized in that: include: A battery cell, the battery cell comprising a bottom wall, a top wall and a side wall, the top wall and the bottom wall are respectively connected to two ends of the side wall along a first direction, and the first direction is a thickness direction of the battery cell; A wrapping film, the wrapping film comprising a bottom, a top and a side, the top covering the top wall, the bottom covering the bottom wall, and the side covering the side wall; A first adhesive layer, the first adhesive layer is located between the battery core and the wrapping film, the first adhesive layer includes a first adhesive portion, and along the first direction, the first adhesive portion is arranged between the top and the top wall and adheres the top wall and the top; The bottom is provided with a second opening, the second opening penetrates the wrapping film along a second direction, and the second direction is perpendicular to the first direction; When viewed along the first direction, a portion of the surface of the battery cell is exposed at the second opening; The first adhesive layer further includes a second adhesive portion, and along the first direction, the second adhesive portion is located between the bottom and the bottom wall.

3. The battery assembly according to claim 1 or 2, characterized in that: The top is provided with a first opening, and when viewed along the first direction, the battery cell is exposed at the first opening.

4. The battery assembly according to claim 3, characterized in that: The top portion includes a plurality of stoppers, the stoppers are connected to the side portions, and when viewed along the first direction, the stoppers cover a portion of the top wall, and the plurality of stoppers surround the first opening; The first adhesive portion is disposed between each of the stopping portions and the top wall.

5. The battery assembly according to claim 4, characterized in that: The stopping portion includes a handle area. When viewed along the first direction, the handle area is separated from the first adhesive layer, and an edge of the handle area is connected to the first opening.

6. The battery assembly according to claim 1 or 2, characterized in that: The top portion includes a first main body portion and a first chamfered portion, wherein the first chamfered portion connects the first main body portion and the side portion; The top wall includes a second main body portion and a second chamfered portion, wherein the second chamfered portion connects the second main body portion and the side wall; Along the first direction, the projection of the first main body portion overlaps with the projection of the second main body portion, and the projection of the first chamfered portion overlaps with the projection of the second chamfered portion; The first adhesive portion bonds the first main body portion and the second main body portion, and the first adhesive portion bonds the first chamfered portion and the second chamfered portion.

7. The battery assembly according to claim 1 or 2, characterized in that: The first adhesive layer is separated from the side portion and the side wall, and the side portion directly contacts the side wall.

8. A terminal device, characterized in that: A battery compartment and a battery assembly as claimed in any one of claims 1 to 7, wherein the battery assembly is accommodated in the battery compartment, and a first gap is provided between the side portion and the battery compartment; The terminal device includes a second adhesive layer, which is located in the first gap and adheres the side and the battery compartment.

9. The terminal device according to claim 8, characterized in that: The battery compartment includes a first wall, the second adhesive layer is separated from the bottom, and the bottom directly contacts the first wall.

10. The terminal device according to claim 9, characterized in that: The battery compartment further includes a second wall, the second wall is connected to and surrounds the first wall, the first wall and the second wall together form a second space, and the battery assembly is accommodated in the second space; the bottom directly contacts the first wall; The side portion includes a first sub-portion and a second sub-portion arranged opposite to each other along a third direction, and the second wall includes a first sub-wall and a second sub-wall arranged opposite to each other along a third direction; the third direction is a length direction or a width direction of the battery assembly; The second adhesive layer is located between the first sub-portion and the first sub-wall and bonds the first sub-portion and the first sub-wall together. The second adhesive layer is located between the second sub-portion and the second sub-wall and bonds the second sub-portion and the second sub-wall together.

11. The terminal device according to claim 10, characterized in that: The first sub-portion is smoothly connected to the bottom with a round chamfer, the second sub-portion is smoothly connected to the bottom with a round chamfer, and the second adhesive layer bonds the round chamfer and the battery compartment.

12. The terminal device according to claim 10, characterized in that: The width of the second adhesive layer along the third direction is W1, 0.1 mm≤W1≤0.3 mm.

13. The terminal device according to claim 8, characterized in that: The bottom is provided with a second opening, the second opening penetrates the wrapping film along a second direction, the second direction is perpendicular to the first direction; when viewed along the first direction, a portion of the surface of the battery cell is exposed at the second opening; The terminal device includes a circuit board, and the circuit board is arranged in the second opening.

Images