Battery module and electrical device

Abstract

A battery module (100) and an electrical device (1000). The battery module (100) comprises a battery cell module (10), a first bonding member (20) and a second bonding member (30). The battery cell module (10) comprises at least two battery cells (11), the at least two battery cells (11) being stacked in a first direction (X), and any two adjacent battery cells (11) being bonded to each other; in the first direction (X), the battery cell module (10) has a first surface (12) and a second surface (13) opposite to each other; the first bonding member (20) is bonded to the first surface (12); the second bonding member (30) is arranged on at least one side of the battery cell module (10) in a second direction (Y); the second bonding member (30) is at least bonded to the outermost battery cell (11) of the battery cell module (10) in the first direction (X). With respect to the battery module (100), since the second bonding member (30) can be bonded to an external element, and the second bonding member (30) is also at least bonded to the outermost battery cell (11) of the battery cell module (10), the stability of the battery cell module (10) after being connected to the external element can be improved; thus, when the battery module (100) falls, the amplitude of vibration on electrode modules (111) in the battery cells (11) can be reduced, thereby reducing the possibility of tearing of the electrode modules (111) caused by relative movement between the electrode modules (111) and casings (112).

Description

Battery assembly and electric device TECHNICAL FIELD

[0001] The present application belongs to the technical field of energy storage, and particularly relates to a battery assembly and an electric device. BACKGROUND

[0002] In the electric device, the battery assembly is located in the cabin and generally includes a plurality of stacked battery cells, one battery cell is located on the inner side of the cabin, and one battery cell is located on the outer side of the cabin. The two battery cells are bonded to each other, the battery cell located on the inner side of the cabin is bonded to the inner wall of the cabin, and the battery cell located on the outer side of the cabin is not fixed to the cabin. The battery cell includes a shell and an electrode assembly. The electrode assembly is arranged in the shell and bonded to the shell.

[0003] SUMMARY

[0004] The present application inventors have found that when the electric device falls, the battery cell located on the outer side of the cabin produces a larger amplitude of vibration than the battery cell located on the inner side of the cabin, which in turn causes the electrode assembly in the battery cell located on the outer side of the cabin to also produce a larger amplitude of vibration, which easily causes the portion of the electrode tab in the electrode assembly bonded to the shell to tear, causing the battery cell to be damaged.

[0005] In view of the above situation, the present application provides a battery assembly, which is beneficial to reduce the possibility of tearing of the electrode assembly.

[0006] In a first aspect, the present application provides a battery assembly, which includes a battery cell assembly, a first bonding member, and a second bonding member. The battery cell assembly includes at least two battery cells, the at least two battery cells are stacked along a first direction, and any two adjacent battery cells are bonded to each other. Along the first direction, the battery cell assembly has opposite first and second faces. The first bonding member is bonded to the first face, and the first bonding member is used to bond to an external element. The second bonding member is arranged on at least one side of the battery cell assembly along a second direction, and the second bonding member at least bonds to the outermost battery cell of the battery cell assembly along the first direction. The second bonding member is used to bond to an external element. The first direction is perpendicular to the second direction.

[0007] In the battery assembly, since the second bonding member can be bonded to the external element, and the second bonding member at least bonds to the outermost battery cell of the battery cell assembly along the first direction X, the stability of the battery cell assembly after being connected to the external element can be improved. Compared with the battery assembly without the second bonding member, the battery assembly of the present application improves the stability of the battery cell assembly to reduce the amplitude of vibration of the electrode assembly in the battery cell when the battery assembly falls, thereby reducing the possibility of tearing of the electrode assembly due to relative movement of the electrode assembly and the shell.

[0008] In one or more embodiments of the present application, the battery cell includes an electrode assembly, a shell, and a tab. The electrode assembly is disposed in the shell. The tab is connected to the electrode assembly and extends out of the shell along a third direction. The third direction is perpendicular to the first direction and the second direction. Along the third direction, a length of the shell is L, and a length of the first adhesive is L1. L and L1 satisfy: 0.37L≤L1≤0.96L. L1≥0.37L is conducive to improving the stability of the adhesion between the battery cell assembly and external elements, and further reduces the possibility of tearing of the electrode assembly. L1≤0.96L is conducive to saving materials.

[0009] In one or more embodiments of the present application, the battery cell includes an electrode assembly, a shell, and a tab. The electrode assembly is disposed in the shell. The tab is connected to the electrode assembly and extends out of the shell along a third direction. The third direction is perpendicular to the first direction and the second direction. Along the second direction, a width of the shell is W, and a width of the first adhesive is W1. W and W1 satisfy: 0.5W≤W1≤0.95W. W1≥0.5W is conducive to improving the stability of the adhesion between the battery cell assembly and external elements, and further reduces the possibility of tearing of the electrode assembly. W1≤0.95W is conducive to saving materials.

[0010] In one or more embodiments of the present application, one second adhesive is disposed on one side of the battery cell assembly along the second direction. Only one second adhesive is provided, which is simple in structure and conducive to improving production efficiency.

[0011] In one or more embodiments of the present application, the battery cell includes an electrode assembly, a shell, and a tab. The electrode assembly is disposed in the shell. The tab is connected to the electrode assembly and extends out of the shell along a third direction. The third direction is perpendicular to the first direction and the second direction. Along the third direction, a length of the shell is L, and a length of the second adhesive is L2. L and L2 satisfy: 0.37L≤L2≤0.96L. L2≥0.37L is conducive to improving the stability of the adhesion between the battery cell assembly and external elements, and further reduces the possibility of tearing of the electrode assembly. L2≤0.96L is conducive to saving materials.

[0012] In one or more embodiments of the present application, the battery cell includes an electrode assembly, a shell, and a tab. The electrode assembly is disposed in the shell. The tab is connected to the electrode assembly and extends out of the shell along a third direction. The third direction is perpendicular to the first direction and the second direction. Along the third direction, a length of the shell is L, a length of the first adhesive is L1, and a length of the second adhesive is L2. L, L1, and L2 satisfy: 0≤|L1-L2|≤0.29L. This is conducive to making the stress on the battery cell assembly at the first adhesive and the second adhesive more uniform, and reducing the possibility of tearing of the electrode assembly due to excessive concentration of stress on part of the electrode assembly when falling.

[0013] In one or more embodiments of the present application, the second adhesive is provided in a plurality, and the plurality of second adhesives are arranged on one side of the battery assembly along the second direction. This facilitates the formation of multiple connections between the battery assembly and external elements, improves the stability of the battery assembly, and reduces the possibility of tearing of the electrode assembly.

[0014] In one or more embodiments of the present application, the plurality of second adhesives are arranged at equal intervals on one side of the battery assembly. This facilitates the uniformity of stress on the battery assembly, improves the stability of the battery assembly, and reduces the possibility of tearing of the electrode assembly.

[0015] In one or more embodiments of the present application, the battery cell includes an electrode assembly, a shell, and a tab, the electrode assembly is arranged in the shell, the tab is connected to the electrode assembly and extends out of the shell along a third direction, and the third direction is perpendicular to the first direction and the second direction. Along the third direction, the length of the shell is L, the length of the first adhesive is L1, and the total length of the plurality of second adhesives arranged on the same side of the battery assembly is L2, and L, L1, and L2 satisfy: 0≤|L1-L2|≤0.29L. This facilitates the uniformity of stress on the battery assembly at the first adhesive and the second adhesive, and reduces the possibility of tearing of the electrode assembly due to excessive concentration of stress on a partial area when falling.

[0016] In one or more embodiments of the present application, the first adhesive is double-sided tape, and the surface of the first adhesive facing away from the battery assembly is covered with a separation film. This facilitates reducing the possibility of the first adhesive losing adhesion due to contamination before being bonded to external elements, and improves the reliability of the first adhesive.

[0017] In one or more embodiments of the present application, the second adhesive is double-sided tape, and the surface of the second adhesive facing away from the battery assembly is covered with a separation film. This facilitates reducing the possibility of the second adhesive losing adhesion due to contamination before being bonded to external elements, and improves the reliability of the second adhesive.

[0018] In one or more embodiments of the present application, the first adhesive and the second adhesive are integrally arranged. This facilitates simplifying the steps of arranging the first adhesive and the second adhesive, and improves production efficiency.

[0019] In the second aspect of the present application, a battery assembly is provided, which includes a device shell and a battery assembly as described in any of the preceding embodiments. The device shell has a receiving space, and the battery assembly is arranged in the receiving space. The first adhesive and the second adhesive are both bonded to the device shell.

[0020] In the electric device, the second adhesive member is adhered to the device housing, and the second adhesive member is adhered to all the battery cells, so that any battery cell can be connected to the device housing, which is beneficial to improve the stability of the connection between the battery cell assembly and the device housing, thereby reducing the possibility of the electrode assembly being torn due to relative movement with the housing when the electric device falls, and improving the durability of the electric device. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 is a structural schematic diagram of a battery assembly in a first embodiment of the present application in one perspective view.

[0022] Fig. 2 is a structural schematic diagram of a battery assembly in a first embodiment of the present application in another perspective view.

[0023] Fig. 3 is a structural schematic diagram of a battery cell in an embodiment of the present application.

[0024] Fig. 4 is a structural schematic diagram of a battery assembly in a second embodiment of the present application.

[0025] Fig. 5 is a structural schematic diagram of a battery assembly in a third embodiment of the present application.

[0026] Fig. 6 is a structural schematic diagram of a battery assembly in a fourth embodiment of the present application.

[0027] Fig. 7 is a partial structural perspective view of an electric device in an embodiment of the present application.

[0028] Explanation of main element symbols

[0029] Battery assembly 100

[0030] Battery cell assembly 10

[0031] Battery cell 11

[0032] Electrode assembly 111

[0033] Housing 112

[0034] Tab 113

[0035] First surface 12

[0036] Second surface 13

[0037] First adhesive member 20

[0038] Second adhesive member 30

[0039] Electric device 1000

[0040] Device housing 200

[0041] First direction X

[0042] Second direction Y

[0043] Third direction Z

[0044] The following detailed description will further describe the present application with reference to the above drawings. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application.

[0046] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or can exist with a middle element. When an element is considered to be "provided" on another element, it can be directly provided on the other element or can exist with a middle element. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0048] 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 two or more, unless otherwise explicitly specified.

[0049] In the description of the embodiments of the present application, the term "vertical" is used to describe the ideal state between two components. In the actual production or use state, there can be a state close to vertical between the two components. The two components described as "vertical" can not be an absolute straight line, plane, but can be approximately straight or planar, and the overall extension direction is straight or planar from a macroscopic point of view. The components are considered to be "straight" or "planar".

[0050] Reference herein to "embodiments" means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily all refer to the same embodiments, nor is it necessarily independent or alternative embodiments to other embodiments. In the case of no conflict, various embodiments in the present application can be combined with each other.

[0051] It should be noted that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device, are only exemplary and should not constitute any limitation on the present application.

[0052] The embodiments of the present application will be further described below with reference to the accompanying drawings.

[0053] As shown in FIG. 1 and FIG. 2, the embodiments of the present application provide a battery assembly 100, comprising a cell assembly 10, a first adhesive 20 and a second adhesive 30. The first adhesive 20 is adhered to the cell assembly 10, and the second adhesive 30 is adhered to the cell assembly 10.

[0054] In some embodiments, the cell assembly 10 comprises at least two cells 11, the at least two cells 11 are stacked along a first direction X, and any two adjacent cells 11 are adhered. Along the first direction X, the cell assembly 10 has opposite first and second faces 12 and 13. The first adhesive 20 is adhered to the first face 12, and the first adhesive 20 is used to adhere to an external element. The second adhesive 30 is provided on at least one side of the cell assembly 10 along a second direction Y, and the second adhesive 30 adheres at least the outermost cell of the cell assembly 10 along the first direction X. The second adhesive 30 is used to adhere to an external element. The first direction X is perpendicular to the second direction Y.

[0055] In some embodiments, as shown in FIG. 3, the battery cell 11 includes an electrode assembly 111, a housing 112, and a tab 113, the electrode assembly 111 is disposed in the housing 112, and the tab 113 is connected to the electrode assembly 111 and extends out of the housing 112.

[0056] In the battery assembly 100, since the second adhesive 30 can be adhered to an external element, and the second adhesive 30 is adhered to at least the outermost battery cell 11 of the battery cell assembly 10 along the first direction X, the stability of the battery cell assembly 100 after being connected to the external element can be improved. Compared with a battery assembly without the second adhesive 30, the battery assembly 100 of the present application improves the stability of the battery cell assembly 10 to reduce the amplitude of the vibration of the electrode assembly 111 in the battery cell 11 when the battery assembly 100 falls, thereby reducing the possibility of the electrode assembly 111 being torn due to the relative movement of the electrode assembly 111 and the housing 112.

[0057] In some embodiments, the external element refers to other components included in the power consumption device 1000 loaded with the battery assembly 100, for example, a device housing 200 of the power consumption device 1000.

[0058] In some embodiments, the electrode assembly 111 includes a positive electrode sheet, a negative electrode sheet, and a separator film disposed between the positive electrode sheet and the negative electrode sheet.

[0059] In some embodiments, the positive electrode sheet, the separator film, and the negative electrode sheet are stacked and wound to form a wound structure.

[0060] In some embodiments, the plurality of positive electrode sheets, the plurality of separator films, and the plurality of negative electrode sheets are stacked to form a laminated structure.

[0061] In some embodiments, the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer disposed on the positive electrode current collector, and the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer disposed on the negative electrode current collector.

[0062] In some embodiments, the positive electrode current collector and the negative electrode current collector are both metal layers. As an exemplary example, the positive electrode current collector can be a metal layer including at least one of aluminum, nickel, tantalum, and titanium, such as an aluminum foil. The negative electrode current collector can be a metal layer including at least one of copper, nickel, tantalum, and titanium, such as a copper foil.

[0063] In some embodiments, the positive electrode active material layer includes a positive electrode active material, as an exemplary example, the positive electrode active material includes at least one of lithium cobaltate, lithium nickel cobalt manganese acid, lithium nickel cobalt aluminum acid, lithium iron phosphate, lithium manganese iron phosphate, or lithium manganese acid. The negative electrode active material layer includes a negative electrode active material, as an exemplary example, the negative electrode active material includes at least one of graphite, hard carbon, soft carbon, silicon, silicon-oxygen material, and silicon-carbon material.

[0064] In some embodiments, the isolation film is a polyethylene film, a polypropylene film, a polyester film, a polyimide film, or the like, which is capable of insulation, so as to isolate the positive electrode sheet and the negative electrode sheet.

[0065] In some embodiments, at least one of the first adhesive 20 and the second adhesive 30 is formed after solidification of liquid glue.

[0066] In some embodiments, the first adhesive 20 is double-sided adhesive tape.

[0067] In some embodiments, a surface of the first adhesive 20 facing away from the battery cell assembly 10 is covered with an isolation film, which is advantageous for reducing the possibility of the first adhesive 20 losing adhesion due to contamination before being bonded to an external element, and improving the reliability of the first adhesive 20.

[0068] In some embodiments, the second adhesive 30 is double-sided adhesive tape.

[0069] In some embodiments, a surface of the second adhesive 30 facing away from the battery cell assembly 10 is covered with an isolation film, which is advantageous for reducing the possibility of the second adhesive losing adhesion due to contamination before being bonded to an external element, and improving the reliability of the second adhesive 30.

[0070] In some embodiments, the second adhesive extends in the first direction X to bond a plurality of battery cells 11.

[0071] In some embodiments, the second adhesive 30 is bonded to all of the battery cells 11, which is advantageous for further improving the stability of the battery cell assembly 10 after being bonded to an external element, thereby reducing the possibility of the electrode assembly 111 being torn.

[0072] In some embodiments, the second adhesive 30 extends to be bonded to the first adhesive 20.

[0073] In some embodiments, as shown in FIGS. 1 and 2, the second adhesive 30 extends to the first surface 12 and / or the second surface 13, and the first surface 12 and / or the second surface 13 are connected to an external element through the second adhesive 30, which is advantageous for further improving the stability of the battery cell assembly 10 after being connected to an external element, thereby reducing the possibility of the electrode assembly 111 being torn.

[0074] In some embodiments, the first adhesive 20 and the second adhesive 30 are integrally arranged, which is advantageous for simplifying the steps of arranging the first adhesive 20 and the second adhesive 30, and improving production efficiency.

[0075] In some embodiments, as shown in FIG. 1, the first direction X is the thickness direction of the battery cell 11, and at this time, the first surface 12 has a larger surface area relative to other surfaces of the battery cell 11, which is advantageous for arranging a larger area of the first adhesive 20, thereby being advantageous for improving the stability of the battery cell assembly 10 after being bonded to an external element.

[0076] In some embodiments, as shown in FIG. 1, the tab 113 protrudes out of the shell 112 along a third direction Z, which is perpendicular to the first direction X and the second direction Y.

[0077] In some embodiments, as shown in FIG. 1, along the third direction Z, the length of the shell 112 is L, and the length of the first adhesive 20 is L1, which satisfies: 0.37L≤L1≤0.96L. L1≥0.37L is conducive to improving the stability of the bonding of the battery cell assembly 10 and external elements, and further reducing the possibility of tearing of the electrode assembly 111; L1≤0.96L is conducive to saving materials.

[0078] In some embodiments, L1 is equal to one of 0.40L, 0.45L, 0.50L, 0.55L, 0.60L, 0.65L, 0.70L, 0.75L, 0.80L, 0.85L, 0.90L, and 0.95L.

[0079] In some embodiments, as shown in FIG. 1, along the second direction Y, the width of the shell 112 is W, and the width of the first adhesive 20 is W1, which satisfies: 0.5W≤W1≤0.95W. W1≥0.5W is conducive to improving the stability of the bonding of the battery cell assembly 10 and external elements, and further reducing the possibility of tearing of the electrode assembly 111; W1≤0.95W is conducive to saving materials.

[0080] In some embodiments, W1 is equal to one of 0.55W, 0.60W, 0.65W, 0.70W, 0.75W, 0.80W, 0.85W, and 0.90W.

[0081] In some embodiments, as shown in FIG. 1, one second adhesive 30 is arranged on one side of the battery cell assembly 10 along the second direction Y. Only one second adhesive 30 is arranged, which is simple in structure and conducive to improving production efficiency.

[0082] In some embodiments, as shown in FIG. 4, two second adhesives 30 are arranged, and the two second adhesives 30 are arranged on both sides of the battery cell assembly 10 along the second direction Y. This is conducive to further improving the stability of the connection of the battery cell assembly 10 and external elements and reducing the possibility of tearing of the electrode assembly 111.

[0083] In some embodiments, as shown in FIG. 1, along the third direction Z, the length of the shell 112 is L, and the length of the second adhesive 30 is L2, which satisfies: 0.37L≤L2≤0.96L. L2≥0.37L is conducive to improving the stability of the bonding of the battery cell assembly 10 and external elements, and further reducing the possibility of tearing of the electrode assembly 111; L2≤0.96L is conducive to saving materials.

[0084] In some embodiments, L2 is equal to one of 0.40L, 0.45L, 0.50L, 0.55L, 0.60L, 0.65L, 0.70L, 0.75L, 0.80L, 0.85L, 0.90L, 0.95L.

[0085] In some embodiments, as shown in FIG. 1, along the third direction Z, the length of the shell 112 is L, the length of the first adhesive 20 is L1, and the length of the second adhesive 30 is L2, L, L1 and L2 satisfy: 0≤|L1-L2|≤0.29L. This is advantageous to make the stress of the battery cell assembly 10 more uniform at the first adhesive 20 and the second adhesive, and reduce the possibility of tearing of the electrode assembly 111 due to excessive concentration of stress in some areas when falling.

[0086] In some embodiments, |L1-L2| is equal to one of 0.1L, 0.15L, 0.2L, 0.25L.

[0087] In some embodiments, as shown in FIG. 5, the second adhesive 30 is provided in a plurality, and the plurality of second adhesives 30 are arranged on one side of the battery cell assembly 10 along the second direction Y. This is advantageous to form multiple connections between the battery cell assembly 10 and external elements, improve the stability of the battery cell assembly 10, and reduce the possibility of tearing of the electrode assembly 111.

[0088] In some embodiments, the plurality of second adhesives 30 are arranged at equal intervals on one side of the battery cell assembly 10. This is advantageous to improve the uniformity of the stress of the battery cell assembly 10, improve the stability of the battery cell assembly 10, and reduce the possibility of tearing of the electrode assembly 111.

[0089] In some embodiments, as shown in FIG. 6, the second adhesive 30 is provided in a plurality, and a part of the number of second adhesives 30 are arranged on one side of the battery cell assembly 10 along the second direction Y, and the remaining second adhesives 30 are arranged on the other side of the battery cell assembly 10 along the second direction Y. This is advantageous to form multiple connections between the battery cell assembly 10 and external elements, improve the stability of the battery cell assembly 10, and reduce the possibility of tearing of the electrode assembly 111.

[0090] In some embodiments, as shown in FIG. 6, the number of second adhesives 30 arranged on opposite sides of the battery cell assembly 10 along the second direction Y is equal, which is advantageous to form multiple connections between the battery cell assembly 10 and external elements, improve the stability of the battery cell assembly 10, and reduce the possibility of tearing of the electrode assembly 111.

[0091] In some embodiments, as shown in FIG. 6, the second adhesives 30 arranged on opposite sides of the battery cell assembly 10 along the second direction Y are symmetrically arranged, which is advantageous to improve the uniformity of the stress of the battery cell assembly 10, thereby further reducing the possibility of tearing of the electrode assembly 111.

[0092] In some embodiments, as shown in FIG. 5, along the third direction Z, the length of the shell 112 is L, the total length of the plurality of second adhesive members 30 arranged on the same side of the electrode assembly 10 is L2, and L and L2 satisfy: 0.37L≤L2≤0.96L. L2≥0.37L is conducive to improving the stability of the adhesion between the electrode assembly 10 and the external element, and further reducing the possibility of tearing of the electrode assembly 111; L2≤0.96L is conducive to saving materials. In FIG. 5, L 21 The sum of L1 and L2 is L2.

[0093] In some embodiments, L2 is equal to one of 0.40L, 0.45L, 0.50L, 0.55L, 0.60L, 0.65L, 0.70L, 0.75L, 0.80L, 0.85L, 0.90L, and 0.95L.

[0094] In some embodiments, as shown in FIG. 5, along the third direction Z, the length of the shell 112 is L, the length of the first adhesive member 20 is L1, the total length of the plurality of second adhesive members 30 arranged on the same side of the electrode assembly 10 is L2, and L, L1, and L2 satisfy: 0≤|L1-L2|≤0.29L. This is conducive to making the stress on the electrode assembly 10 at the first adhesive member 20 and the second adhesive member 30 more uniform, and reducing the possibility of tearing of the electrode assembly 111 due to excessive concentration of stress on a partial area when falling.

[0095] In some embodiments, |L1-L2| is equal to one of 0.1L, 0.15L, 0.2L, and 0.25L.

[0096] As shown in FIG. 7, the embodiments of the present application also provide a power-using device 1000, which includes a device shell 200 and a battery assembly 100 according to any one of the preceding embodiments. The device shell 200 has a receiving space, the battery assembly 100 is arranged in the receiving space, and the first adhesive member 20 and the second adhesive member 30 are both adhered to the device shell 200.

[0097] In the power-using device 1000, the second adhesive member 30 is adhered to the device shell 200, and the second adhesive member 30 is adhered to all the electrode assemblies 11, so that any electrode assembly 11 can be connected to the device shell 200, which is conducive to improving the stability of the connection between the electrode assembly 10 and the device shell 200, thereby reducing the possibility of tearing of the electrode assembly 111 due to relative movement between the electrode assembly 111 and the shell 112 when the power-using device 1000 falls, and improving the durability of the power-using device 1000.

[0098] In some embodiments, the power-using device 1000 includes, but is not limited to, an electric toy, an electric tool (such as an electric drill), and an electronic cigarette.

[0099] To verify whether the size (length, width) of the first adhesive 20 and the second adhesive 30 has an effect on the tearing of the electrode assembly 111 after the electrical device 1000 falls, the inventors conducted the following drop experiment.

[0100] The process of the drop experiment is that the electrical device 1000 is randomly dropped from a height of 1.5 m for 10 times, and after the drop, the battery cell 11 in the electrical device 1000 is disassembled to observe the tearing of the electrode assembly 111. The drop experiment is conducted for 26 groups, which are Comparative Example 1 and Experimental Examples 1-25, respectively.

[0101] In the drop experiment, the length of the shell 112 of the single battery cell 11 used is 68 mm, the width is 20 mm, and the thickness is 6.5 mm, wherein the length refers to the size of the shell 112 along the third direction Z, the width refers to the size of the shell 112 along the second direction Y, and the thickness refers to the size of the shell 112 along the first direction X.

[0102] In Comparative Example 1, two battery cells 11 are arranged in the device shell 200 of the electrical device 1000, the two battery cells 11 are stacked along the first direction X, and the two battery cells 11 are adhered, wherein the surface of one of the battery cells 11 along the first direction X is adhered with the first adhesive 20, and the first adhesive 20 is also adhered with the device shell 200.

[0103] In Experimental Examples 1-18, the battery assembly 100 involved in the present application is arranged in the device shell 200 of the electrical device 1000, the battery assembly 100 used includes the battery cell assembly 10, the first adhesive 20, and the second adhesive 30, the battery cell assembly 10 includes two battery cells 11, one of which is adhered with the device shell 200 through the first adhesive 20, and both of the battery cells 11 are adhered with the device shell 200 through the second adhesive 30, the second adhesive 30 is provided with one and arranged on one side of the battery cell assembly 10 along the second direction Y, and the second adhesive 30 is adhered with both of the battery cells 11.

[0104] In Experimental Examples 19-25, the battery assembly 100 involved in the present application is arranged in the device shell 200 of the electrical device 1000, the battery assembly 100 used includes the battery cell assembly 10, the first adhesive 20, and the second adhesive 30, the battery cell assembly 10 includes two battery cells 11, one of which is adhered with the device shell 200 through the first adhesive 20, and both of the battery cells 11 are adhered with the device shell 200 through the second adhesive 30, the second adhesive 30 is provided with two and arranged on one side of the battery cell assembly 10 along the second direction Y, the two battery cell assemblies 10 are arranged side by side along the third direction Z, the length and width of the two second adhesives 30 are the same, and both of the battery cells are adhered with the two battery cells 11. When recording the experimental data, L 21L2 represents the total length of two second adhesive members 30.

[0105] In the comparative example 1 and the experimental examples 1-25, a total of 50 electric appliances 1000 are subjected to the drop test, and when any one of the two electrode assemblies 111 in a certain electric appliance 1000 is torn, it is determined that the electric appliance 1000 is unqualified.

[0106] Based on the foregoing experimental conditions, the experimental results are recorded as shown in Table 1, in which L, W, L1, W1, L2, L 21 The units of L, W, L1, W1, L2, L

[0107] Table 1

[0108] In order to clearly show the influence of the size (length, width) of the first adhesive member 20 and the second adhesive member 30 on the tearing of the electrode assembly 111, the experimental data in Table 1 is arranged as shown in Table 2:

[0109] Table 2

[0110] According to Table 1 and Table 2, it can be seen that the qualified rate of the electric appliance 1000 in the comparative example 1 is only 70%, and the qualified rate of the electric appliance 1000 in the experimental examples 1-25 is higher than 70%, so it can be known that by setting the second adhesive member 30, it is beneficial to reduce the possibility of tearing of the electrode assembly 111 when the electric appliance 1000 falls.

[0111] According to Table 1 and Table 2, in the experimental examples 1-7, when the value of L1 / L decreases, the qualified rate of the electric appliance 1000 has a downward trend, and when 0.37≤L1 / L≤0.96, the qualified rate of the electric appliance 1000 is above 80%, which is higher than the qualified rate of the electric appliance 1000 when L1 / L is equal to 0.22 or 0.29, so when L and L1 satisfy: 0.37L≤L1≤0.96, it is beneficial to further reduce the possibility of tearing of the electrode assembly 111.

[0112] According to Table 1 and Table 2, in the experimental examples 1 and 8-12, when the value of W1 / W decreases, the qualified rate of the electric appliance 1000 has a downward trend, and when 0.5≤W1 / W≤0.95, the qualified rate of the electric appliance 1000 is above 80%, which is higher than the qualified rate of the electric appliance 1000 when W1 / W is equal to 0.4, so when W and W1 satisfy: 0.5W≤W1≤0.95, it is beneficial to further reduce the possibility of tearing of the electrode assembly 111.

[0113] As can be seen from Table 1 and Table 2, in Experimental Example 1 and Experimental Examples 13-18, one second adhesive member 30 is provided on one side of the battery cell assembly 10 along the second direction Y, and as the value of L2 / L decreases, the pass rate of the electrical device 1000 has a decreasing trend, and when 0.37≤L2 / L≤0.96, the pass rate of the electrical device 1000 is above 80%, which is higher than the pass rate of the electrical device 1000 when L2 / L is equal to 0.22 or 0.29. Therefore, when L and L2 satisfy 0.37L≤L2≤0.96L, it is beneficial to further reduce the possibility of tearing of the electrode assembly 111.

[0114] As can be seen from Table 1 and Table 2, in Experimental Examples 1-7 and Experimental Examples 13-18, one second adhesive member 30 is provided on one side of the battery cell assembly 10 along the second direction Y, and as the value of |L1-L2| / L increases, the pass rate of the electrical device 1000 has a decreasing trend, and when 0≤|L1-L2| / L≤0.29, the pass rate of the electrical device 1000 is higher than the pass rate when |L1-L2| / L is equal to any one of 0.46, 0.59, 0.66 and 0.74. Therefore, when L, L1 and L2 satisfy 0≤|L1-L2|≤0.29L, it is beneficial to further reduce the possibility of tearing of the electrode assembly 111.

[0115] As can be seen from Table 1 and Table 2, in Experimental Example 1 and Experimental Examples 19-25, two second adhesive members 30 are provided on one side of the battery cell assembly 10 along the second direction Y, and as the value of L2 / L decreases, the pass rate of the electrical device 1000 has a decreasing trend, and when 0.37≤L2 / L≤0.96, the pass rate of the electrical device 1000 is above 80%, which is higher than the pass rate of the electrical device 1000 when L2 / L is equal to 0.22 or 0.29. Therefore, when L and L2 satisfy 0.37L≤L2≤0.96L, it is beneficial to further reduce the possibility of tearing of the electrode assembly 111.

[0116] As can be seen from Table 1 and Table 2, in Experimental Examples 19-25, two second adhesive members 30 are provided on one side of the battery cell assembly 10 along the second direction Y, and as the value of |L1-L2| / L increases, the pass rate of the electrical device 1000 has a decreasing trend, and when 0≤|L1-L2| / L≤0.29, the pass rate of the electrical device 1000 is higher than the pass rate when |L1-L2| / L is equal to any one of 0.46, 0.59, 0.66 and 0.74. Therefore, when L, L1 and L2 satisfy 0≤|L1-L2|≤0.29L, it is beneficial to further reduce the possibility of tearing of the electrode assembly 111.

[0117] Those skilled in the art should know that the above-mentioned embodiments are only used to explain the present application, but not as a limitation to the present application, as long as the changes and modifications made to the above embodiments are within the scope of the present application.

Claims

1. A battery assembly (100) characterized by, include: A battery cell assembly (10) includes at least two battery cells (11) stacked along a first direction (X) and any two adjacent battery cells (11) are bonded together. Along the first direction (X), the battery cell assembly (10) has opposing first surfaces (12) and second surfaces (13). A first adhesive element (20) is bonded to the first surface (12), and the first adhesive element (20) is used to bond with external components; A second adhesive member (30) is disposed on at least one side of the cell assembly (10) along the second direction (Y). The second adhesive member (30) is at least adhesive to the outermost cell (11) of the cell assembly (10) along the first direction (X). The second adhesive member (30) is used to bond with external components. The first direction (X) is perpendicular to the second direction (Y).

2. The battery assembly (100) of claim 1, wherein, The battery cell (11) includes an electrode assembly (111), a housing (112), and a tab (113). The electrode assembly (111) is disposed inside the housing (112). The tab (113) is connected to the electrode assembly (111) and extends out of the housing (112) along a third direction (Z). The third direction (Z) is perpendicular to the first direction (X) and the second direction (Y). The battery assembly (100) satisfies at least one of conditions a and b: a. Along the third direction (Z), the length of the housing (112) is L, and the length of the first adhesive member (20) is L1, where L and L1 satisfy: 0.37L≤L1≤0.96L; b. Along the second direction (Y), the width of the housing (112) is W, and the width of the first adhesive member (20) is W1, where W and W1 satisfy: 0.5W≤W1≤0.95W.

3. The battery assembly (100) according to claim 1 or 2, characterized in that A second adhesive member (30) is disposed on one side of the cell assembly (10) along the second direction (Y).

4. The battery assembly (100) of claim 3, wherein, The battery cell (11) includes an electrode assembly (111), a housing (112), and a tab (113). The electrode assembly (111) is disposed inside the housing (112). The tab (113) is connected to the electrode assembly (111) and extends out of the housing (112) along a third direction (Z). The third direction (Z) is perpendicular to the first direction (X) and the second direction (Y). Along the third direction (Z), the length of the housing (112) is L, and the length of the second adhesive member (30) is L2, where L and L2 satisfy: 0.37L≤L2≤0.96L.

5. The battery assembly (100) of claim 3, wherein, The battery cell (11) includes an electrode assembly (111), a housing (112), and a tab (113). The electrode assembly (111) is disposed inside the housing (112). The tab (113) is connected to the electrode assembly (111) and extends out of the housing (112) along a third direction (Z). The third direction (Z) is perpendicular to the first direction (X) and the second direction (Y). Along the third direction (Z), a length of the shell (112) is L, a length of the first adhesive member (20) is L1, and a length of the second adhesive member (30) is L2, L, L1 and L2 satisfy: 0≤|L1-L2|≤0.29L.

6. The battery assembly (100) of claim 1 or 2, wherein, The second adhesive member (30) is provided in plurality, and the plurality of second adhesive members (30) are provided on one side of the battery cell assembly (10) along the second direction (Y).

7. The battery assembly (100) of claim 6, wherein, The plurality of second adhesive members (30) are provided on one side of the battery cell assembly (10) at equal intervals.

8. The battery assembly (100) of claim 6, wherein, The battery cell (11) comprises an electrode assembly (111), a shell (112) and a tab (113), the electrode assembly (111) is provided in the shell (112), the tab (113) is connected with the electrode assembly (111) and extends out of the shell (112) along a third direction (Z), the third direction (Z) is perpendicular to the first direction (X) and the second direction (Y); Along the third direction (Z), a length of the shell (112) is L, a length of the first adhesive member (20) is L1, and a length of the plurality of second adhesive members (30) provided on the same side of the battery cell assembly (10) is L2, L, L1 and L2 satisfy: 0≤|L1-L2|≤0.29L.

9. The battery assembly (100) of claim 1, wherein, The first adhesive member (20) is double-sided adhesive tape, and a surface of the first adhesive member (20) away from the battery cell assembly (10) is covered with a separation film; and / or The second adhesive member (30) is double-sided adhesive tape, and a surface of the second adhesive member (30) away from the battery cell assembly (10) is covered with a separation film.

10. The battery assembly (100) according to any one of claims 1-9, characterized in that, The first adhesive member (20) and the second adhesive member (30) are integrally provided.

11. An electric device (1000) characterized in that, The device shell (200) has a containing space, and the battery assembly (100) is provided in the containing space, and the first adhesive member (20) and the second adhesive member (30) are both adhered with the device shell (200). The device shell (200) has a containing space, and the battery assembly (100) is provided in the containing space, and the first adhesive member (20) and the second adhesive member (30) are both adhered with the device shell (200).

Images