Battery cell assembly and electric apparatus

Abstract

A battery cell assembly (100) and an electric apparatus (1000). The battery cell assembly (100) comprises a battery cell (10) and a second bonding member (20). The battery cell (10) comprises an electrode assembly (11), a first bonding member (12) and a flexible casing (13), wherein the electrode assembly (11) is accommodated in the flexible casing (13); the flexible casing (13) comprises a first surface (131) and a second surface (132) arranged opposite each other in a first direction (X), the first surface (131) facing the electrode assembly (11); and the first bonding member (12) bonds the first surface (131) to the electrode assembly (11), and the region of the first surface (131) that is bonded to the first bonding member (12) is a first region (121). The second bonding member (20) is bonded to the second surface (132), the region of the second surface (132) that is bonded to the second bonding member (20) is a second region (21), the first region (121) and the second region (21) are located on the same side of the electrode assembly (11), and the projection of the second region (21) in the first direction (X) is located within the first region (121). The battery cell assembly (100) facilitates a reduction in the possibility of the electrode assembly (11) being torn and a reduction in the possibility of the battery cell (10) being damaged, thereby improving the durability of the battery cell assembly (100).

Description

Battery cells, components and electrical equipment Technical Field

[0001] This application belongs to the field of energy storage technology, and specifically relates to a battery cell assembly and electrical equipment. Background Technology

[0002] A battery cell typically consists of a housing and an electrode assembly. The electrode assembly is housed inside the housing and bonded to it. When the battery cell is installed in an electrical appliance, the housing is bonded to the components of the appliance. When the appliance falls, the vibration is transmitted through the housing to the electrode assembly, causing relative movement between the electrode assembly and the housing. This can easily lead to tearing at the bonded portion of the electrode assembly, resulting in damage to the battery cell.

[0003] Summary of the Invention

[0004] In view of the above situation, it is necessary to provide a cell assembly that helps to reduce the possibility of electrode assembly tearing.

[0005] A first aspect of this application provides a battery cell assembly, including a battery cell and a second adhesive member. The battery cell includes an electrode assembly, a first adhesive member, and a flexible housing. The electrode assembly is housed within the flexible housing. The flexible housing includes a first surface and a second surface disposed opposite each other along a first direction. The first surface faces the electrode assembly. The first adhesive member adheres to the first surface and the electrode assembly. The area of ​​the first surface adhered to by the first adhesive member is a first region. The second adhesive member is adhered to the second surface. The area of ​​the second surface adhered to by the second adhesive member is a second region. The first region and the second region are located on the same side of the electrode assembly. The projection of the second region along the first direction is located within the first region, and the projected area of ​​the second region along the first direction is smaller than the projected area of ​​the first region along the first direction.

[0006] In this battery cell assembly, the second adhesive is used to bond the battery cell to the external structure. When the battery cell assembly and the external structure fall together, the impact on the external structure is transmitted to the flexible shell through the second adhesive. Since the projection of the second region along the first direction is located within the first region, and the projection area of ​​the second region along the first direction is smaller than the projection area of ​​the first region along the first direction, the part of the flexible shell that deforms under the action of the second adhesive is located within the first region. The first adhesive provides a buffer for the transmission of the deformation of the flexible shell to the electrode assembly. Furthermore, the stress is mainly concentrated at the edge of the second region, which helps to reduce the possibility of the electrode assembly tearing and the possibility of battery cell damage, thereby improving the durability of the battery cell assembly.

[0007] In one or more embodiments of this application, the number of the first adhesive member and the second adhesive member is one each, forming a first region and a second region. This simplifies the structure of the battery cell assembly, improves production efficiency, and reduces production costs.

[0008] In one or more embodiments of this application, both the first region and the second region are rectangular, with the length of the first region being L1 and the length of the second region being L2, where L1 and L2 satisfy: 0.48L1≤L2≤0.98L1. This helps to further reduce the possibility of electrode assembly tearing.

[0009] In one or more embodiments of this application, both the first region and the second region are rectangular, with the width of the first region being D1 and the width of the second region being D2, where D1 and D2 satisfy: 0.5D1≤D2≤0.93D1. This helps to further reduce the possibility of electrode assembly tearing.

[0010] In one or more embodiments of this application, at least one of the first region and the second region is non-rectangular, the area of ​​the first region is S1, and the area of ​​the second region is S2, wherein S1 and S2 satisfy: 0.32S1≤S2≤0.86S1. This is beneficial for further reducing the possibility of electrode assembly tearing.

[0011] In one or more embodiments of this application, the battery cell assembly includes a third adhesive member and a fourth adhesive member. The third adhesive member adheres to a first surface and an electrode assembly, and the area of ​​the first surface adhered to by the third adhesive member is a third region. The fourth adhesive member adheres to a second surface, and the area of ​​the second surface adhered to by the fourth adhesive member is a fourth region. The third region and the fourth region are located on the same side of the electrode assembly. The projection of the fourth region along a first direction is located within the third region, and the projected area of ​​the fourth region along the first direction is smaller than the projected area of ​​the third region along the first direction. Providing the third adhesive member helps to increase the bonding area between the flexible shell and the electrode assembly, thereby improving the stability of the connection between the flexible shell and the electrode assembly. The fourth adhesive member is used to adhere the battery cell to an external structure, which helps to improve the stability of the connection between the battery cell and the external structure. The smaller projected area of ​​the fourth region along the first direction compared to the third region further reduces the possibility of tearing of the battery cell assembly, thereby improving the durability of the battery cell.

[0012] In one or more embodiments of this application, the number of first adhesive members is one to form a first region, and the number of second adhesive members is multiple to form multiple second regions. This facilitates the formation of multiple adhesive connections between the battery cell and the external structure through the second adhesive members, thereby improving the stability of the connection between the battery cell and the external structure.

[0013] In one or more embodiments of this application, a plurality of second adhesive elements are arranged in an array. This facilitates uniform stress distribution on the flexible housing.

[0014] In one or more embodiments of this application, the area of ​​the first region is S1, and the area of ​​the plurality of second regions is S2, wherein S1 and S2 satisfy: 0.39S1≤S2≤0.88S1. This is beneficial for further reducing the possibility of electrode assembly tearing.

[0015] In one or more embodiments of this application, the second adhesive is double-sided adhesive. This helps to reduce the production cost of battery cell assemblies.

[0016] In one or more embodiments of this application, along a first direction, the surface of the second adhesive member away from the flexible housing is covered with an isolation film.

[0017] A second aspect of this application provides an electrical device including the battery cell assembly involved in any of the foregoing embodiments.

[0018] In some embodiments of this application, the electrical device includes a housing having a receiving space, a battery cell assembly disposed in the receiving space, and a second adhesive member adhesively bonding the housing.

[0019] In some embodiments of this application, the battery cell assembly is provided with at least two, and for any two adjacent battery cell assemblies, the second adhesive of one battery cell assembly is bonded to the flexible housing of the other battery cell assembly. Attached Figure Description

[0020] Figure 1 is a schematic diagram of the overall structure of the battery cell assembly in the first embodiment of this application.

[0021] Figure 2 is a cross-sectional view of the cell assembly in the first embodiment of this application.

[0022] Figure 3 is a perspective view of the cell assembly in the first embodiment of this application.

[0023] Figure 4 is a perspective view of the cell assembly in the second embodiment of this application.

[0024] Figure 5 is a cross-sectional view of the cell assembly in the third embodiment of this application.

[0025] Figure 6 is a perspective view of the cell assembly in the third embodiment of this application.

[0026] Figure 7 is a perspective view of the cell assembly in the fourth embodiment of this application.

[0027] Figure 8 is a perspective view of the cell assembly in the fifth embodiment of this application.

[0028] Figure 9 is a schematic diagram of the structure of an electrical device in one embodiment of this application.

[0029] Figure 10 is a cross-sectional view of the electrical equipment portion in one embodiment of this application.

[0030] Figure 11 is a schematic diagram of the structure of the ordinary battery cell used in Comparative Example 1 of the drop test.

[0031] Figure 12 is a partial structural cross-sectional view of the electrical equipment used in Comparative Example 1 of the drop test.

[0032] Figure 13 is a perspective view of the ordinary battery cell used in Comparative Example 1 of the drop test.

[0033] Explanation of main component symbols

[0034] 100 battery cells

[0035] First cell assembly 101

[0036] Second cell assembly 102

[0037] Battery Cell 10

[0038] Electrode assembly 11

[0039] First adhesive component 12

[0040] Area 121

[0041] Flexible shell 13

[0042] Page 131

[0043] Page 132

[0044] JE14

[0045] Third adhesive component 15

[0046] Third District 151

[0047] Second adhesive component 20

[0048] Second Zone 21

[0049] Fourth adhesive component 30

[0050] Area 4, 31

[0051] Ordinary battery cell 200

[0052] First Cell 201

[0053] Second battery cell 202

[0054] Casing 300

[0055] 1000 electrical appliances

[0056] First direction X

[0057] Second direction Y

[0058] Third direction Z

[0059] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0060] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0061] 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 there may be an element positioned in between. When an element is considered to be "set" on another element, it can be directly set on the other element or there may be an element positioned in between. In this application, unless otherwise expressly specified and limited, the terms "installed," "connected," etc., should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0062] 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 herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0063] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0064] In the description of the embodiments of this application, the term "perpendicular" is used to describe the ideal state between two components. In actual production or use, two components may exist in a state that is approximately perpendicular. The two components described as "perpendicular" may not be absolutely straight lines or planes, but may be approximately straight lines or planes. From a macroscopic perspective, if the overall extension direction is a straight line or plane, the component can be considered as a "straight line" or "plane".

[0065] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. Where there is no conflict, the various embodiments in this application can be combined with each other.

[0066] The embodiments of this application will be further described below with reference to the accompanying drawings.

[0067] As shown in Figures 1 and 2, an embodiment of this application provides a battery cell assembly 100, including a battery cell 10 and a second adhesive member 20. The second adhesive member 20 is bonded to the battery cell 10.

[0068] The battery cell 10 includes an electrode assembly 11, a first adhesive member 12, and a flexible housing 13. The electrode assembly 11 is housed within the flexible housing 13. The flexible housing 13 includes a first surface 131 and a second surface 132 disposed opposite to each other along a first direction X. The first surface 131 faces the electrode assembly 11. The first adhesive member 12 adheres to the first surface 131 and the electrode assembly 11. The area of ​​the first surface 131 that is adhered to the first adhesive member 12 is the first region 121.

[0069] The second adhesive 20 is bonded to the second surface 132, and the area of ​​the second surface 132 bonded to the second adhesive 20 is the second region 21. The first region 121 and the second region 21 are located on the same side of the electrode assembly 11. The projection of the second region 21 along the first direction X is located within the first region 121, and the projected area of ​​the second region 21 along the first direction X is smaller than the projected area of ​​the first region 121 along the first direction X.

[0070] In this battery cell assembly 100, the second adhesive 20 is used to bond the battery cell 10 to the external structure. When the battery cell assembly 100 and the external structure fall together, the impact on the external structure is transmitted to the flexible shell 13 through the second adhesive 20. Since the projection of the second region 21 along the first direction X is located within the first region 121, and the projected area of ​​the second region 21 along the first direction X is smaller than the projected area of ​​the first region 121 along the first direction X, the part of the flexible shell 13 that deforms under the action of the second adhesive 20 is located within the first region 121. The first adhesive 12 provides a buffer for the transmission of the deformation of the flexible shell 13 to the electrode assembly 11. Furthermore, the stress is mainly concentrated at the edge of the second region 21, which helps to reduce the possibility of the electrode assembly 11 tearing and the possibility of damage to the battery cell 10, thereby improving the durability of the battery cell assembly 100.

[0071] In the above, the external structure can be another battery cell assembly 100, or it can be a component included in the electrical device 1000 that houses the battery cell assembly 100, such as the housing 300 of the electrical device 1000 (as shown in Figure 10). No specific limitation is made here.

[0072] In some embodiments, the electrode assembly 11 includes a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode.

[0073] In some embodiments, the positive electrode, the separator, and the negative electrode are stacked and then wound to form a wound structure.

[0074] In some embodiments, a plurality of positive electrode sheets, a plurality of separators, and a plurality of negative electrode sheets are stacked to form a stacked structure.

[0075] In some embodiments, the positive electrode includes a positive current collector and a positive active material layer disposed on the positive current collector, and the negative electrode includes a negative current collector and a negative active material layer disposed on the negative current collector.

[0076] In some embodiments, both the positive current collector and the negative current collector are metal layers. As an example, the positive current collector may be a metal layer comprising at least one of aluminum, nickel, tantalum, and titanium, such as aluminum foil. The negative current collector may be a metal layer comprising at least one of copper, nickel, tantalum, and titanium, such as copper foil.

[0077] In some embodiments, the positive electrode active material layer includes a positive electrode active material. As an example, the positive electrode active material 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. The negative electrode active material layer includes a negative electrode active material. As an example, the negative electrode active material includes at least one of graphite, hard carbon, soft carbon, silicon, silicon-oxygen materials, and silicon-carbon materials.

[0078] In some embodiments, the separator is an insulating film material such as polyethylene film, polypropylene film, polyester film, or polyimide film, so as to separate the positive electrode and the negative electrode.

[0079] In some embodiments, as shown in Figures 1 and 2, the battery cell 10 further includes a tab 14, which is connected to the electrode assembly 11 and extends out of the flexible housing 13.

[0080] In some embodiments, as shown in Figures 1 and 2, the tab 14 extends out of the flexible housing 13 along a second direction Y. The second direction Y is perpendicular to the first direction X.

[0081] In some embodiments, the tabs 14 are provided in multiple ways, with a portion of the tabs 14 extending out of the flexible housing 13 along the second direction Y, and a portion of the tabs 14 extending out of the flexible housing 13 in a direction opposite to the second direction Y.

[0082] In some embodiments, as shown in Figures 1 and 2, the first direction X is the thickness direction of the battery cell 10. The area of ​​the surface of the flexible shell 13 along the first direction X is larger than the area of ​​other surfaces, which is beneficial to increasing the area of ​​the first region 121 and improving the stability of the connection between the electrode assembly 11 and the flexible shell 13. It is also beneficial to increase the area of ​​the second region 21 and improve the stability of the connection between the second adhesive 20 and the external structure.

[0083] In some embodiments, the flexible housing 13 is an aluminum-plastic film.

[0084] In some embodiments, as shown in FIG3, the number of the first adhesive member 12 and the second adhesive member 20 is set to one, to form a first region 121 and a second region 21. Having only one first region 121 and one second region 21 simplifies the structure of the battery cell assembly 100, improves production efficiency, and reduces production costs.

[0085] In some embodiments, as shown in FIG3, both the first region 121 and the second region 21 are rectangles.

[0086] In some embodiments, as shown in FIG3, the length of the first region 121 is L1, and the length of the second region 21 is L2, wherein L1 and L2 satisfy: 0.48L1≤L2≤0.98L1. This helps to further reduce the possibility of tearing of the electrode assembly 11. Here, length refers to the dimension of the first region 121 and the second region 21 along the second direction Y.

[0087] In some embodiments, the minimum value of L2 can be one of 0.5L1, 0.55L1, 0.6L1, 0.65L1, and 0.7L1.

[0088] In some embodiments, the maximum value of L2 can be one of 0.75L1, 0.8L1, 0.85L1, 0.9L1, and 0.95L1.

[0089] In some embodiments, as shown in FIG3, the width of the first region 121 is D1, and the width of the second region 21 is D2, wherein D1 and D2 satisfy: 0.5D1≤D2≤0.93D1. This helps to further reduce the possibility of tearing of the electrode assembly 11. The width refers to the dimension of the first region 121 and the second region 21 along a third direction Z, which is perpendicular to the first direction X and the second direction Y.

[0090] In some embodiments, the minimum value of D2 can be one of 0.55D1, 0.6D1, 0.65D1, and 0.7D1.

[0091] In some embodiments, the maximum value of D2 can be one of 0.75D1, 0.8D1, 0.85D1, and 0.9D1.

[0092] In some embodiments, as shown in FIG4, at least one of the first region 121 and the second region 21 is a non-rectangular shape. The specific shape of the non-rectangular shape is not limited here. It can be a regular shape, such as a triangle, circle, ellipse and regular polygon, or an irregular shape. It can be an axisymmetric shape or a non-axisymmetric shape.

[0093] In some embodiments, the area of ​​the first region 121 is S1, and the area of ​​the second region 21 is S2, where S1 and S2 satisfy: 0.32S1≤S2≤0.86S1. This helps to further reduce the possibility of tearing of the electrode assembly 11.

[0094] In some embodiments, the minimum value of S2 can be one of 0.35S1, 0.4S1, 0.45S1, 0.5S1, 0.55S1, and 0.6S1.

[0095] In some embodiments, the maximum value of S2 can be one of 0.65S1, 0.7S1, 0.75S1, 0.8S1, and 0.85S1.

[0096] In some embodiments, as shown in Figures 5 and 6, the battery cell assembly 100 includes a third adhesive member 15 and a fourth adhesive member 30. The third adhesive member 15 is bonded to a first surface 131 and an electrode assembly 11. The area of ​​the first surface 131 bonded to the third adhesive member 15 is a third region 151. The fourth adhesive member 30 is bonded to a second surface 132. The area of ​​the second surface 132 bonded to the fourth adhesive member 30 is a fourth region 31. The third region 151 and the fourth region 31 are located on the same side of the electrode assembly 11. The projection of the fourth region 31 along the first direction X is located within the third region 151, and the projected area of ​​the fourth region 31 along the first direction X is smaller than the projected area of ​​the third region 151 along the first direction X. The third adhesive 15 is provided to increase the bonding area between the flexible housing 13 and the electrode assembly 11, thereby improving the stability of the connection between the flexible housing 13 and the electrode assembly 11. The fourth adhesive 30 is used to bond the battery cell 10 to the external structure, which is beneficial to improving the stability of the connection between the battery cell 10 and the external structure. The projected area of ​​the fourth region 31 along the first direction X is smaller than the projected area of ​​the third region 151 along the first direction X, which is beneficial to further reduce the possibility of tearing of the battery cell assembly 100 and improve the durability of the battery cell 10.

[0097] In some embodiments, as shown in Figures 5 and 6, both the third region 151 and the fourth region 31 are rectangles.

[0098] In some embodiments, as shown in Figures 5 and 6, the length of the third region 151 is L3, and the length of the fourth region 31 is L4, where L3 and L4 satisfy: 0.48L3≤L4≤0.98L3. This helps to further reduce the possibility of tearing of the electrode assembly 11.

[0099] In some embodiments, the minimum value of L4 can be one of 0.5L3, 0.55L3, 0.6L3, 0.65L3, or 0.7L3.

[0100] In some embodiments, the maximum value of L4 can be one of 0.75L3, 0.8L3, 0.85L3, 0.9L3, and 0.95L3.

[0101] In some embodiments, as shown in Figures 5 and 6, the width of the third region 151 is D3, and the width of the fourth region 31 is D4, where D3 and D4 satisfy: 0.5D3≤D4≤0.93D3. This helps to further reduce the possibility of tearing of the electrode assembly 11.

[0102] In some embodiments, the minimum value of D4 can be one of 0.55D3, 0.6D3, 0.65D3, 0.7D3, etc.

[0103] In some embodiments, the maximum value of D4 can be one of 0.75D3, 0.8D3, 0.85D3, and 0.9D3.

[0104] In some embodiments, at least one of the third region 151 and the fourth region 31 is non-rectangular.

[0105] In some embodiments, the area of ​​the third region 151 is S3, and the area of ​​the fourth region 31 is S4, where S3 and S4 satisfy: 0.32S3≤S4≤0.86S3. This helps to further reduce the possibility of tearing of the electrode assembly 11.

[0106] In some embodiments, the minimum value of S4 can be one of 0.35S3, 0.4S3, 0.45S3, 0.5S3, 0.55S3, or 0.6S3.

[0107] In some embodiments, the maximum value of S4 can be one of 0.65S3, 0.7S3, 0.75S3, 0.8S3, and 0.85S3.

[0108] In some embodiments, as shown in FIG7 or FIG8, there is one first adhesive member 12 to form a first region 121, and there are multiple second adhesive members 20 to form multiple second regions 21. This facilitates the formation of multiple adhesive connections between the battery cell 10 and the external structure through the second adhesive members 20, thereby improving the stability of the connection between the battery cell 10 and the external structure.

[0109] In some embodiments, a plurality of second adhesive members 20 are arranged in an array. This facilitates uniform stress distribution on the flexible housing 13.

[0110] In some embodiments, the area of ​​the first region 121 is S1, and the area of ​​the plurality of second regions 21 is S2, i.e., S2 refers to the sum of the areas of all the second regions 21. S1 and S2 satisfy: 0.39S1≤S2≤0.88S1. This helps to further reduce the possibility of tearing of the electrode assembly 11.

[0111] In some embodiments, the minimum value of S2 can be one of 0.4S1, 0.45S1, 0.5S1, 0.55S1, and 0.6S1.

[0112] In some embodiments, the maximum value of S2 can be one of 0.65S1, 0.7S1, 0.75S1, 0.8S1, and 0.85S1.

[0113] In some embodiments, at least one of the first adhesive 12, the second adhesive 20, the third adhesive 15, and the fourth adhesive 30 is a double-sided adhesive. This helps to reduce the production cost of the battery cell assembly 100.

[0114] In some embodiments, at least one of the first adhesive 12, the second adhesive 20, the third adhesive 15, and the fourth adhesive 30 is formed by solidifying liquid adhesive.

[0115] In some embodiments, the second adhesive 20 is a double-sided adhesive, and the surface of the second adhesive 20 away from the flexible housing 13 is covered with a release film, which helps to keep the second adhesive 20 sticky before it is bonded to the external structure.

[0116] In some embodiments, the third adhesive 15 is a double-sided adhesive, and the surface of the third adhesive 15 away from the flexible housing 13 is covered with a release film, which helps to keep the third adhesive 15 sticky before bonding it to the external structure.

[0117] As shown in Figure 9, an embodiment of this application provides an electrical device including the battery cell assembly 100 involved in any of the foregoing embodiments. When the electrical device falls, the impact on other structures of the electrical device is transmitted to the flexible housing 13 through the second adhesive member 20. Since the projection of the second region 21 along the first direction X is located within the first region 121, and the projected area of ​​the second region 21 along the first direction X is smaller than the projected area of ​​the first region 121 along the first direction X, the portion of the flexible housing 13 that deforms under the action of the second adhesive member 20 is located within the first region 121. The first adhesive member 12 provides a buffer for the transmission of the deformation of the flexible housing 13 to the electrode assembly 11. Furthermore, the stress is mainly concentrated at the edge of the second region 21, which helps to reduce the possibility of tearing of the electrode assembly 11 and the possibility of damage to the battery cell 10, thereby improving the durability of the battery cell assembly 100 and thus improving the durability of the electrical device.

[0118] In some embodiments, as shown in FIG10, the electrical device 1000 includes a housing 300 having a receiving space, a battery cell assembly 100 disposed in the receiving space, and a second adhesive 20 adhesively bonding the housing 300.

[0119] In some embodiments, as shown in FIG10, the battery cell assembly 100 is provided with at least two, and for any two adjacent battery cell assemblies 100, the second adhesive 20 of one battery cell assembly 100 is bonded to the flexible housing 13 of the other battery cell assembly 100.

[0120] In some embodiments, the electrical device 1000 includes, but is not limited to, electric toys, power tools (such as electric drills), and electronic cigarettes.

[0121] To verify the effect of the dimensional relationship (length, width, or area) between the first region 121 and the second region 21 on whether the electrode assembly 11 is torn after the electrical equipment 1000 is dropped, the inventors conducted the following drop test.

[0122] The drop test involved randomly dropping the electrical device 1000 from a height of 1.5m 10 times. After each drop, the battery cell 10 inside the electrical device 1000 was disassembled to observe the tearing of the electrode assembly 11. A total of 26 drop tests were conducted, namely Comparative Example 1 and Experimental Examples 1-25.

[0123] In Comparative Example 1, as shown in Figures 11 and 12, a certain electrical device 1000 has two identical ordinary battery cells 200 inside its housing 300. The structure of the ordinary battery cell 200 is basically the same as that of the battery cell assembly 100 provided in this application. The difference is that, for the ordinary battery cell 200, the projection of its first region 121 along the first direction X is located within its second region 21, and the projected area of ​​the first region 121 along the first direction X is less than or equal to the projected area of ​​the second region 21 along the first direction X, or the projection of the first region 121 along the first direction X and the projection of the second region 21 along the first direction X only partially overlap, or the projection of the first region 121 along the first direction X and the projection of the second region 21 along the first direction X completely overlap.

[0124] In Comparative Example 1, as shown in Figure 13, the projection of the first region 121 of the ordinary battery cell 200 along the first direction X is located within its second region 21, and the projected area of ​​the first region 121 along the first direction X is less than or equal to the projected area of ​​the second region 21 along the first direction X. The flexible shell 13 of the ordinary battery cell 200 is 68mm long, 20mm wide, and 6.5mm thick. For ease of distinction, one of the two ordinary battery cells 200 is referred to as the first battery cell 201, and the other as the second battery cell 202. The second adhesive 20 of the first battery cell 201 is bonded to the flexible shell 13 of the second battery cell 202, and the second adhesive 20 of the second battery cell 202 is bonded to the shell 300 of the electrical device 1000.

[0125] In Comparative Example 1, please refer to Figure 13 for the shapes of the first region 121 and the second region 21. Both the first region 121 and the second region 21 are rectangles.

[0126] In Experiment 1-25, as shown in Figure 10, the housing 300 of the electrical equipment is provided with two identical battery cell assemblies 100. The flexible housing 13 of the battery cell assembly 100 is 68mm long, 20mm wide, and 6.5mm thick. For easy distinction, one of the two battery cell assemblies 100 is called the first battery cell assembly 101, and the other is called the second battery cell assembly 102. The second adhesive 20 of the first battery cell assembly 101 is bonded to the flexible housing 13 of the second battery cell assembly 102, and the second adhesive 20 of the second battery cell assembly 102 is bonded to the housing 300 of the electrical equipment 1000.

[0127] In Experiments 1-12, please refer to Figure 3 for the shapes of the first region 121 and the second region 21. Both the first region 121 and the second region 21 are rectangular. The difference between any two experiments in Experiments 1-12 lies in the different dimensions of the second region 21.

[0128] In Experiments 13-17, please refer to Figure 7 for the shapes of the first region 121 and the second region 21. There is one first region 121 and two second regions 21, which are arranged along the second direction Y. Both the first region 121 and the second region 21 are rectangular. The difference between any two experiments in Experiments 13-17 lies in the different dimensions of the second region 21.

[0129] In Experiments 18-21, please refer to Figure 8 for the shapes of the first region 121 and the second region 21. There are two first regions 121 and two second regions 21, and the two second regions 21 are arranged along the third direction Z. Both the first region 121 and the second region 21 are rectangular. The difference between any two experimental examples in Experiments 18-21 lies in the different sizes of the second regions 21.

[0130] In Experiments 22-25, the shapes of the first region 121 and the second region 21 are shown in Figure 4. Both the first region 121 and the second region 21 are defined, with the first region 121 being rectangular and the second region 21 being non-rectangular. In Experiments 22-25, the shape of the second region 21 is obtained by removing four congruent rectangular regions from a rectangle. To facilitate the calculation of the area of ​​the second region 21, parameters a and b are introduced. Parameter a represents the length of a removed region along the second direction Y, and parameter b represents the width of a removed region along the third direction Z. D² represents the maximum width of the second region 21 along the third direction Z. Therefore, in Experiments 22-25, S² = L²D² - 4ab. The difference between any two experiments in Experiments 22-25 lies in the different dimensions of the second region 21.

[0131] In Comparative Example 1 and Experimental Examples 1-25, a total of 50 electrical devices 1000 were subjected to drop tests in each group to observe the tearing of the electrode assembly 11. When any one of the two electrode assemblies 11 in a certain electrical device 1000 was torn, the electrical device 1000 was deemed unqualified.

[0132] Based on the aforementioned experimental conditions, the experimental results are recorded as shown in Table 1. In Table 1, the units of L1, D1, L2, D2, a, and b are all millimeters (mm), and the units of S1 and S2 are all square millimeters (mm). 2 ).

[0133] Table 1

[0134] It should be noted that in the table above, L2 in Experimental Examples 13-17 refers to the sum of the lengths of the two second regions 21, and D2 in Experimental Examples 18-21 refers to the sum of the widths of the two second regions 21.

[0135] To clearly demonstrate the dimensional (length, width, and area) relationship between the first region 121 and the second region 21, and the impact on the tearing of the electrode assembly 11, the experimental data in Table 1 are summarized as shown in Table 2. In Table 2, the pass rate represents the percentage of qualified electrical devices 1000 in a certain group of drop tests out of the total number.

[0136] Table 2

[0137] It should be noted that for Experimental Examples 13-21, one first region 121 corresponds to two second regions 21. For Experimental Examples 22-25, the second region 21 is not rectangular. The ratio of S1 to S2 is used to measure the size relationship between the first region 121 and the second region 21 in the three experimental examples. Therefore, the values ​​of L2 / L1 and D2 / D1 are not shown in Table 2 for Experimental Examples 13-25.

[0138] According to Tables 1 and 2, in Comparative Example 1, the pass rate of electrical equipment 1000 is only 64%, while in Experimental Examples 1-25, the pass rate of electrical equipment 1000 is greater than or equal to 72%. Experimental Examples 1-25 satisfy the condition that the projection of the second region 21 along the first direction X is located within the first region 121, and the projected area of ​​the second region 21 along the first direction X is smaller than the projected area of ​​the first region 121 along the first direction X. This helps to reduce the possibility of the electrode assembly 11 tearing and the possibility of the battery cell 10 being damaged, thereby improving the durability of the battery cell assembly 100.

[0139] According to Tables 1 and 2, Experimental Examples 1 and 8-12 satisfy 0.48L1≤L2≤0.98L1, and the pass rate of electrical equipment 1000 is greater than or equal to 82%, which helps to further reduce the possibility of electrode assembly 11 tearing.

[0140] According to Tables 1 and 2, Experimental Examples 1-5 satisfy 0.5D1≤D2≤0.93D1, and the pass rate of electrical equipment 1000 is greater than or equal to 80%, which helps to further reduce the possibility of tearing of electrode assembly 11.

[0141] According to Tables 1 and 2, and comparing Experimental Examples 1-25, it can be seen that when S2 is less than S1, as the ratio of S2 / S1 decreases, the possibility of the electrode assembly 11 tearing tends to decrease first and then increase.

[0142] According to Tables 1 and 2, in Experiments 22-24, both a first region 121 and a second region 21 are provided. The first region 121 is rectangular, and the second region 21 is non-rectangular. The area S1 of the first region 121 and the area S2 of the second region 21 satisfy 0.32S1≤S2≤0.86S1. In this case, the pass rate of the electrical equipment 1000 is greater than or equal to 82%. This helps to further reduce the possibility of tearing of the electrode assembly 11.

[0143] According to Tables 1 and 2, in Experiments 13-20, there is one first region 121 and two second regions 21. The area S1 of the first region and the area S2 of the second region satisfy: 0.39S1≤S2≤0.88S1. The pass rate of the electrical equipment 1000 is greater than or equal to 80%. This is beneficial to further reduce the possibility of tearing of the electrode assembly 11.

[0144] Those skilled in the art should recognize that the above embodiments are only used to illustrate this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments within the essential spirit and scope of this application fall within the scope of this application.

Claims

1. An electric cell assembly (100), characterized by The battery cell (10) comprises an electrode assembly (11), a first adhesive (12), and a flexible casing (13). The electrode assembly (11) is accommodated in the flexible casing (13). The flexible casing (13) comprises a first face (131) and a second face (132) oppositely arranged along a first direction (X). The first face (131) faces the electrode assembly (11). The first adhesive (12) adheres the first face (131) and the electrode assembly (11). An area of the first face (131) adhered by the first adhesive (12) is a first area (121). A second adhesive (20) adheres the second face (132). An area of the second face (132) adhered by the second adhesive (20) is a second area (21). The first area (121) and the second area (21) are located on the same side of the electrode assembly (11). A projection of the second area (21) along the first direction (X) is located in the first area (121). The number of the first adhesive (12) and the second adhesive (20) is one, so as to form one first area (121) and one second area (21).

2. The cell assembly (100) of claim 1, wherein, 3. The battery cell assembly (100) of claim 2, wherein The first area (121) and the second area (21) are rectangular. The battery cell assembly (100) satisfies at least one of conditions (1) and (2) below. (1) A length of the first area (121) is L1, a length of the second area (21) is L2, and L1 and L2 satisfy: 0.48L1≤L2≤0.98L1. (2) A width of the first area (121) is D1, a width of the second area (21) is D2, and D1 and D2 satisfy: 0.5D1≤D2≤0.93D1.

4. The battery cell assembly (100) of claim 2, wherein At least one of the first area (121) and the second area (21) is non-rectangular. An area of the first area (121) is S1, and an area of the second area (21) is S2. S1 and S2 satisfy: 0.32S1≤S2≤0.86S1. The battery cell assembly (100) comprises a third adhesive (15) and a fourth adhesive (30). The third adhesive (15) adheres the first face (131) and the electrode assembly (11). An area of the first face (131) adhered by the third adhesive (15) is a third area (151). ​ ​ ​ 5. The cell assembly (100) as claimed in claims 1-4, characterized in that, ​ The fourth adhesive (30) is adhered to the second surface (132), and the region of the second surface (132) adhered to the fourth adhesive (30) is a fourth region (31). The third region (151) and the fourth region (31) are located on the same side of the electrode assembly (11), the projection of the fourth region (31) along the first direction (X) is located in the third region (151), and the projection area of the fourth region (31) along the first direction (X) is less than the projection area of the third region (151) along the first direction (X). The number of the first adhesive (12) is one, forming one first region (121), and the number of the second adhesive (20) is multiple, forming multiple second regions (21).

6. The cell assembly (100) of claim 1, wherein, The multiple second adhesives (20) are arrayed.

7. The cell assembly (100) of claim 6, wherein, The area of the first region (121) is S1, and the area of the multiple second regions (21) is S2. S1 and S2 satisfy: 0.39S1≤S2≤0.88S1.

8. The cell assembly (100) according to claim 6 or 7, characterized in that The second adhesive (20) is double-sided tape.

9. The cell assembly (100) according to any one of claims 1 to 8, characterized in that Along the first direction (X), the surface of the second adhesive (20) away from the flexible shell (13) is covered with a release film.

10. The cell assembly (100) of claim 9, wherein, The electric device (1000) comprises a shell (300) having a receiving space, and the electric cell assembly (100) is arranged in the receiving space.

11. An electric device (1000) characterized in that, The second adhesive (20) of one of the electric cell assemblies (100) adheres to the flexible shell (13) of another of the electric cell assemblies (100).

12. The powered device (1000) of claim 11, wherein, ​ 13. The powered device (1000) of claim 11, wherein, ​

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