Battery cell, battery, and electronic device

Abstract

The application discloses an electrode assembly, a battery and an electronic device. The electrode assembly comprises a first tab, and an insulating sheet comprising a first sheet body and a second sheet body. The first sheet body comprises a first wall surface, and the second sheet body is connected to the first sheet body and comprises a second wall surface facing the first wall surface. The first wall surface and the second wall surface jointly define a first gap, and the first gap has a first port and a second port distributed opposite to each other. The direction from the first port to the second port is a first direction, and the first direction intersects a direction perpendicular to the first wall surface. Since the current collector of the electrode assembly can only contact the wall surface of the first sheet body away from the first wall surface, the current collector cannot contact the part of the first tab between the first sheet body and the second sheet body, so the first tab is difficult to contact the current collector with different polarity and short circuit occurs, thereby improving the safety performance of the electrode assembly.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and in particular to a battery cell, battery, and electronic device. Background Technology

[0002] The battery cell contains an insulating sheet and an electrode assembly. The insulating sheet supports the tabs of the electrode assembly, facilitating electrical connection between the tabs and the terminals. In existing batteries, the tabs are prone to contact with current collectors of opposite polarity, leading to short circuits. Summary of the Invention

[0003] This application provides a battery cell, a battery, and an electronic device that can improve the safety of the battery cell.

[0004] To solve the aforementioned technical problems, this application adopts the following technical solution: A battery cell is provided, including an electrode assembly. The electrode assembly includes a first tab, and an insulating sheet includes a first body and a second body. The first body includes a first wall surface, and the second body is used to connect to the first body. The second body includes a second wall surface facing the first wall surface. The first wall surface and the second wall surface together define a first gap. The first gap has a first port and a second port distributed opposite to each other. The direction from the first port to the second port is a first direction, which intersects with the direction perpendicular to the first wall surface. The insulating sheet is configured to allow the first tab to sequentially pass through the first port and the second port. In this solution, because the first tab is held between the first body and the second body, the position of the first tab relative to the insulating sheet as a whole is relatively stable. The first tab is less likely to move relative to the insulating sheet and contact the battery cell's outer casing, thus preventing a short circuit. Furthermore, since the current collector of the electrode assembly can only contact the wall surface of the first sheet facing away from the first wall, and cannot contact the portion of the first tab located between the first and second sheets, the first tab is unlikely to come into contact with the current collector of opposite polarity, thus preventing a short circuit and improving the safety performance of the battery cell. Moreover, since the current collector cannot contact the portion of the first tab located between the first and second sheets, the tab adhesive on this portion can be omitted, reducing the material cost of the battery cell.

[0005] In some embodiments, at least one of the following conditions (a)-(d) is satisfied: (a) the first sheet and the second sheet are thermally fused together. (b) the first sheet and the second sheet are bonded together. (c) the insulating sheet includes a first connecting portion that clamps the first sheet and the second sheet, the first connecting portion including a first part and a second part that are elastically connected to each other; the first part abuts against the wall surface of the first sheet away from the first wall surface to generate an elastic thrust on the first sheet in the direction from the first sheet to the second sheet; the second part abuts against the wall surface of the second sheet away from the second wall surface to generate an elastic thrust on the second sheet in the direction from the second sheet to the first sheet. (d) the insulating sheet includes a second connecting portion, one end of which is fixedly connected to the first sheet and the other end of which is fixedly connected to the second sheet. In the above solutions, the thermal fusion connection method is simple to operate, requires no additional components, and is inexpensive. The adhesive component can be positioned between the first and second cells. This not only conceals the adhesive component, minimizing its space within the battery cell, but also creates a certain distance between the first and second cells, thus defining the initial gap. The first connection method is simple to assemble and easy to disassemble, facilitating maintenance. The second connection method provides a more reliable connection.

[0006] In some embodiments, along a first direction, the first sheet includes a first side facing away from the first port, and the second sheet includes a second side facing away from the first port. The second side is located between the first side and the first port, and the second side and the first wall surface together define the second port. In the above solution, the first tab is less likely to cross the first side of the first sheet along the first direction X and come into contact with the battery cell casing, thus improving the safety of the battery cell.

[0007] In some embodiments, the first wall surface is provided with a protrusion, which is located on the side of the second port opposite to the first port. In the above solution, the protrusion can further reduce the probability of the first electrode tab going over the first side of the first plate, and can also prevent the bending part of the first electrode tab from contacting the outer casing and causing a short circuit, thereby improving the safety performance of the battery cell.

[0008] In some embodiments, along a first direction, the first sheet includes a third side facing away from the second port, and the second sheet includes a fourth side facing away from the second port. The third and fourth sides together define the first port. In the above solution, the structure of the insulating sheet is simpler, making the assembly process of the first electrode tab and the insulating sheet more convenient.

[0009] In some embodiments, the first sheet is provided with a first through hole, which extends through the first sheet along its thickness direction and includes a first port. In the above solution, the first electrode tab can be positioned by the surrounding walls of the first through hole, making it less likely for the first electrode tab to shift relative to the first sheet, thus enhancing the limiting effect on the first electrode tab.

[0010] In some embodiments, along a first direction, the first sheet includes a third side facing away from the second port, and the second sheet includes a fourth side facing away from the second port. The insulating sheet includes a third connecting portion, one end of which is connected to the third side and the other end of which is connected to the fourth side. In the above solution, the third connecting portion does not occupy additional space along the perpendicular to the first wall surface, thus not increasing the overall thickness of the insulating sheet, reducing the space occupied by the insulating sheet inside the cell, and improving the energy density of the cell.

[0011] In some embodiments, the first sheet, the second sheet, and the third connecting portion are configured to be integrally formed from sheet material, with the third connecting portion bent so that the first wall surface faces the second wall surface. This solution, on the one hand, makes the connection between the first sheet and the second sheet more reliable, and on the other hand, simplifies the processing steps of the insulating sheet and reduces its processing cost.

[0012] In some embodiments, the third connecting portion is provided with a plurality of second through holes arranged along the length direction of the third side, each second through hole connecting the gap between the first wall surface and the second wall surface. In the above solution, the provision of the second through holes makes the third connecting portion easier to bend, reduces the difficulty of the bending process, and also reduces the possibility of cracks appearing in the third connecting portion due to bending.

[0013] In some embodiments, the insulating sheet satisfies one of the following conditions (e)-(g): (e) The first port is located at the third connecting part. (f) The third connecting part and the third side jointly define the first port. (g) The third connecting part, the third side, and the fourth side jointly define the first port. In the above scheme, the material of the third connecting part can be reduced, making it easier to bend the third connecting part.

[0014] In some embodiments, the electrode assembly further includes a second tab, which has a polarity opposite to that of the first tab. The first and second walls further define a second gap having a third port and a fourth port distributed opposite to each other along a first direction. An insulating sheet is configured to allow the second tab to pass sequentially through the third and fourth ports. In this configuration, the insulating sheet can be assembled with both the first and second tabs simultaneously, and the insulating sheet reduces the probability of a short circuit due to contact between the second tab and a current collector of opposite polarity, further improving the safety performance of the battery cell.

[0015] In some embodiments, the insulating sheet satisfies at least one of the following conditions (h)-(j): (h) the first gap and the second gap are connected. (i) the first port and the third port are connected. (j) the second port and the fourth port are connected. In the above solution, the processing of the first gap, the second gap, the first port, the second port, the third port, and the fourth port is simpler and more convenient, and the processing cost is low.

[0016] A second aspect of this application also provides a battery comprising the cells of any of the above.

[0017] A third aspect of this application also provides an electronic device comprising the battery cell of any of the above.

[0018] The battery cell provided in this application allows the first tab to pass sequentially through the first port, the first gap, and the second port before being bent to fit or space from the wall surface of the second sheet facing away from the second wall surface, thereby facilitating the electrical connection between the first tab and the terminal post. Since the first tab is held between the first and second sheets, its position relative to the overall insulating sheet is relatively stable, making it less likely for the first tab to move relative to the insulating sheet and come into contact with the battery cell's outer casing, thus preventing a short circuit. Furthermore, because the current collector of the electrode assembly can only contact the wall surface of the first sheet facing away from the first wall surface, and cannot contact the portion of the first tab located between the first and second sheets, the first tab is unlikely to come into contact with a current collector of opposite polarity, thus improving the battery cell's safety performance. Moreover, since the current collector cannot contact the portion of the first tab located between the first and second sheets, the tab adhesive on this portion can be omitted, reducing the battery cell's material cost. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0020] Figure 1 This is a three-dimensional schematic diagram of the combination of the insulating sheet and the first electrode tab provided in the first embodiment of this application; Figure 2 This is a cross-sectional schematic diagram of the insulating sheet provided in the first embodiment of this application; Figure 3 This is a three-dimensional schematic diagram of the insulating sheet provided in the second embodiment of this application; Figure 4 This is a partial schematic diagram of a perspective view of the combination of the insulating sheet and the first electrode tab provided in the third embodiment of this application; Figure 5This is a partial schematic diagram of a perspective view of the combination of the insulating sheet and the first electrode tab provided in the fourth embodiment of this application; Figure 6 This is a three-dimensional schematic diagram of the insulating sheet provided in the fifth embodiment of this application; Figure 7 This is a cross-sectional schematic diagram of the insulating sheet provided in the fifth embodiment of this application; Figure 8 This is a three-dimensional schematic diagram of the insulating sheet provided in the sixth embodiment of this application; Figure 9 This is a three-dimensional schematic diagram of the insulating sheet provided in the seventh embodiment of this application; Figure 10 This is a three-dimensional schematic diagram of the combination of the insulating sheet, the first electrode, and the second electrode provided in the seventh embodiment of this application; Figure 11 This is a three-dimensional schematic diagram of the combination of the insulating sheet, the first electrode, and the second electrode provided in the seventh embodiment of this application; Figure 12 This is a side view schematic diagram of the combination of the insulating sheet, the first electrode, and the second electrode provided in the seventh embodiment of this application; Figure 13 This is a three-dimensional schematic diagram of the insulating sheet provided in the eighth embodiment of this application; Figure 14 This is a cross-sectional schematic diagram of the combination of the insulating sheet and the first electrode tab provided in the ninth embodiment of this application; Figure 15 This is a cross-sectional schematic diagram of the battery cell provided in the second embodiment of this application. Detailed Implementation

[0021] To facilitate understanding of this application, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this specification are for illustrative purposes only.

[0022] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0023] The battery cell includes a casing, an electrode assembly, an insulating sheet, and terminals. The casing defines a cavity in which the electrode assembly is disposed. The terminals pass through the casing to be electrically connected to the electrode assembly, thereby discharging electrical energy from the battery cell. The electrode assembly includes two electrodes of opposite polarity, a first electrode and a second electrode. The first electrode includes a first current collector and a first tab, and the second electrode includes a second current collector and a second tab. The first and second tabs bypass the insulating sheet and are supported by the insulating sheet facing away from the walls of the first and second current collectors, thereby being electrically connected to the terminals. In existing battery cells, on the one hand, the first and second tabs are prone to move relative to the insulating sheet and come into contact with the casing, resulting in a short circuit; on the other hand, the portion of the first tab located on the side of the insulating sheet closer to the wall of the second current collector is prone to come into contact with the second current collector, resulting in a short circuit.

[0024] In view of this, see Figures 1 to 14 This application provides an insulating sheet 100 for a battery cell 10, which can improve the safety performance of the battery cell 10. Specifically, the battery cell 10 includes an electrode assembly 300, which includes a first tab 310 and a second tab 320 with opposite polarities.

[0025] The insulating sheet 100 includes a first sheet body 110 and a second sheet body 120. The first sheet body 110 includes a first wall surface 114. The second sheet body 120 is connected to the first sheet body 110 and includes a second wall surface 123 facing the first wall surface 114. See also Figure 1-2 The first wall surface 114 can be spaced apart from each other. See also Figure 5 The first wall surface 114 and the second wall surface 123 may be in partial contact or partially spaced. The first wall surface 114 and the second wall surface 123 may be planar walls, curved walls or irregular walls.

[0026] See Figure 1-2 The first wall surface 114 and the second wall surface 123 together define a first gap 150, which has a first port 151 and a second port 152 that are distributed opposite to each other. In one embodiment, the first wall surface 114 and the second wall surface 123 may be spaced apart to define the first gap 150. See also Figure 4 In another embodiment, both the first wall surface 114 and the second wall surface 123 have recesses, and the two recesses together form the first gap 150.

[0027] The direction from the first port 151 to the second port 152 is the first direction X. The first direction X intersects the direction perpendicular to the first wall 114 (i.e., the first direction X is not perpendicular to the first wall 114). The insulating sheet 100 is configured to allow the first electrode 310 to pass through the first port 151, the first gap 150 and the second port 152 in sequence.

[0028] When the insulating sheet 100 is in use, the first sheet 110 can be positioned between the second sheet 120 and the electrode assembly 300. The first tab 310 of the electrode assembly 300 extends from the first port 151 through the first gap 150, and then extends from the second port 152, and is bent to fit or be spaced from the wall surface of the second sheet 120 away from the first sheet 110, thereby facilitating the connection between the first tab 310 and the electrode post 400.

[0029] In this application, the insulating sheet 100 has the following characteristics: Firstly, since the first tab 310 is held by the first sheet body 110 and the second sheet body 120, the position of the first tab 310 relative to the overall insulating sheet 100 is relatively stable. The first tab 310 is not likely to move relative to the insulating sheet 100 and come into contact with the outer casing 200 of the battery cell 10, thereby causing a short circuit.

[0030] Secondly, since the current collector of the electrode assembly 300 can only contact the wall surface of the first piece 110 away from the first wall surface 114, it cannot contact the part of the first tab 310 located between the first piece 110 and the second piece 120. Therefore, the first tab 310 is difficult to contact the current collector with opposite polarity, thus preventing a short circuit and improving the safety performance of the battery cell 10.

[0031] Thirdly, since the current collector cannot contact the portion of the first tab 310 located between the first sheet 110 and the second sheet 120, the tab adhesive on this portion can be omitted, reducing the material cost of the cell 10.

[0032] It should be noted that the first sheet 110 and the second sheet 120 in this application can be connected before or during the assembly process with the first tab 310. The assembly method of the first tab 310 and the insulating sheet 100 can vary depending on the connection method of the first sheet 110 and the second sheet 120. For example, when the first sheet 110 and the second sheet 120 are connected to each other before assembly with the first tab 310, the first tab 310 is assembled with the insulating sheet 100 by passing through the first gap 150. When the first sheet 110 and the second sheet 120 are connected to each other during the assembly process with the first tab 310, the first sheet 110 and the second sheet 120 can first clamp the first tab 310, and then the first sheet 110 and the second sheet 120 can be connected to complete the assembly of the insulating sheet 100 and the first tab 310. Compared with the assembly method of letting the first tab 310 pass through the first gap 150, this assembly method is simpler and more convenient to process.

[0033] The specific connection method between the first sheet 110 and the second sheet 120 depends on the actual needs. For example, the connection method between the first sheet 110 and the second sheet 120 can satisfy at least one of the following conditions (a)-(d): (a) The first piece 110 and the second piece 120 are heat-fused together. The heat-fused portion depends on the needs, and can specifically be the outer peripheral edges of both pieces. The heat-fused connection method is simple to operate, requires no additional components, and is inexpensive.

[0034] (b) See also Figure 4 The first sheet 110 and the second sheet 120 are bonded together. Specifically, the insulating sheet 100 may also include an adhesive member 170, which is used to bond the first sheet 110 and the second sheet 120. The bonding method and bonding location of the adhesive member 170 depend on specific requirements. In one embodiment, the adhesive member 170 may be disposed between the first sheet 110 and the second sheet 120. On the one hand, this can hide the location of the adhesive member 170 and not occupy too much space in the battery cell 10. On the other hand, it can also create a certain distance between the first sheet 110 and the second sheet 120, thereby facilitating the definition of the first gap 150.

[0035] (c) See Figures 6-8 The insulating sheet 100 includes a first connecting portion 140 that clamps a first sheet 110 and a second sheet 120. The first connecting portion 140 includes a first part 141 and a second part 142 that are elastically connected to each other. The first part 141 abuts against the wall surface of the first sheet 110 away from the first wall surface 114 to generate an elastic thrust on the first sheet 110 in the direction from the first sheet 110 to the second sheet 120. The second part 142 abuts against the wall surface of the second sheet 120 away from the second wall surface 123 to generate an elastic thrust on the second sheet 120 in the direction from the second sheet 120 to the first sheet 110. The first connecting portion 140 connects the first sheet 110 and the second sheet 120 by clamping them. This method is simple to assemble, easy to disassemble, and convenient for maintenance.

[0036] (d) The insulating sheet includes a second connecting portion, one end of which is fixedly connected to the first sheet 110 and the other end of which is fixedly connected to the second sheet 120. The material of the second connecting portion may be the same as or different from the material of the first sheet 110 and the second sheet 120. When the material of the second connecting portion is the same as the material of the first sheet 110 and the second sheet 120, the first sheet 110, the second sheet 120 and the second connecting portion can be integrally formed and connected.

[0037] See Figure 2Along the first direction X, the first sheet 110 includes a first side 111 facing away from the first port 151, and the second sheet 120 includes a second side 121 facing away from the first port 151. The second side 121 is located between the first side 111 and the first port 151, and the second side 121 and the first wall surface 114 together define the second port 152. In other words, in this embodiment, along the first direction X, the width of the first sheet 110 is greater than the width of the second sheet 120, so that when the first tab 310 is bent to fit against or spaced from the wall surface of the second sheet 120 facing away from the second wall surface 123, the first tab 310 is less likely to cross the first side 111 of the first sheet 110 along the first direction X and come into contact with the outer casing 200 of the battery cell 10, thereby improving the safety of the battery cell 10.

[0038] See Figures 8-14 In one embodiment, the first wall surface 114 is provided with a protrusion 160, which is located on the side of the second port 152 opposite to the first port 151. The protrusion 160 can restrict the movement of the first electrode tab 310 toward the first side 111, further reducing the probability of the first electrode tab 310 crossing the first side 111 of the first plate 110, and also preventing the bend of the first electrode tab 310 from contacting the lower shell of the outer casing 200 (e.g., Figure 15 This reduces the risk of short circuits caused by contact with the battery cell, thus improving the safety performance of the 10 battery cell.

[0039] See Figure 1-2 In one embodiment, along the first direction X, the first sheet 110 includes a third side 112 facing away from the second port 152, and the second sheet 120 includes a fourth side 122 facing away from the second port 152. The third side 112 and the fourth side 122 together define the first port 151. In the above solution, it is not necessary to make additional holes in the first sheet 110 and the second sheet 120 to obtain the first port 151. The first port 151 can be obtained directly through the gap between the third side 112 and the fourth side 122, which simplifies the structure and makes the assembly process of the first tab 310 and the insulating sheet 100 more convenient.

[0040] See Figure 13 In one embodiment, the first sheet 110 is provided with a first through hole 113, which extends through the first sheet 110 along its thickness direction. The first through hole 113 includes a first port 151. In the above solution, the first port 151 is defined by opening a hole in the first sheet 110, and the first tab 310 can be positioned by the surrounding walls of the first through hole 113, making it less likely for the first tab 310 to displace relative to the first sheet 110, thus enhancing the limiting effect on the first tab 310.

[0041] See Figures 9-14In some embodiments, along the first direction X, the first sheet 110 includes a third side 112 facing away from the second port 152, and the second sheet 120 includes a fourth side 122 facing away from the second port 152. The insulating sheet includes a third connecting portion 130, one end of which is connected to the third side 112, and the other end is connected to the fourth side 122. In the above solution, the third connecting portion 130 does not occupy additional space along the perpendicular to the first wall surface 114, thus not increasing the overall thickness of the insulating sheet 100, reducing the space occupied by the insulating sheet 100 inside the cell 10, and improving the energy density of the cell 10.

[0042] When the third connecting portion 130 is connected to the third side 112 and the fourth side 122 respectively, in one embodiment, the first sheet 110, the second sheet 120, and the third connecting portion 130 can be configured to be integrally formed from sheet material, and the third connecting portion 130 is bent so that the first wall surface 114 faces the second wall surface 123. In the above solution, the insulating sheet 100 can be processed from a single part, which on the one hand makes the connection between the first sheet 110 and the second sheet 120 more reliable, and on the other hand simplifies the processing steps of the insulating sheet 100 and reduces the processing cost of the insulating sheet 100.

[0043] Furthermore, when the first sheet 110, the second sheet 120, and the third connecting portion 130 are configured to be integrally formed from sheet material, the first protrusion can be configured to be formed by the first sheet 110 through a stamping process. For example, stamping can be performed on the wall surface of the first sheet 110 away from the first wall surface 114, thereby forming a recess on the wall surface of the first sheet 110 away from the first wall surface 114 and forming a protrusion on the first wall surface 114 of the first sheet 110, which is the aforementioned protrusion portion 160.

[0044] See Figure 11 In some embodiments, the third connecting portion 130 is provided with a plurality of second through holes 131 arranged along the length direction of the third side 112, each second through hole 131 connecting the gap between the first wall surface 114 and the second wall surface 123. The provision of the second through holes 131 makes the third connecting portion 130 easier to bend, reducing the difficulty of the bending process, and also reducing the possibility of cracks appearing in the third connecting portion 130 due to bending. The number, shape, and size of the second through holes 131 depend on specific requirements.

[0045] In some embodiments, in order to facilitate the bending of the third connecting portion 130, the thickness of the third connecting portion 130 may be thinner than that of the first sheet 110 and the second sheet 120. Specifically, a groove parallel to the length direction of the first side 111 may be provided on the third connecting portion 130. The groove may be formed by stamping or by washing. In some embodiments, the insulating sheet 100 satisfies one of the following conditions (e)-(g): (e) See also Figure 14 The first port 151 is located at the third connecting part 130. This reduces the material required for the third connecting part 130 and makes it easier to bend.

[0046] (f) The third connecting portion 130 and the third side 112 together define the first port 151. That is, the first port 151 is located at the junction of the third connecting portion 130 and the third side 112, which also facilitates the bending of the third connecting portion 130 relative to the first sheet 110.

[0047] (g) See also Figures 9-12 The third connecting portion 130, the third side 112, and the fourth side 122 together define the first port 151. This reduces the material of the third connecting portion 130 and makes it easier to bend.

[0048] A single insulating sheet 100 may be assembled only with the first tab 310 and not with the second tab 320. For example, in one embodiment, two insulating sheets 100 may be provided, one of which is assembled with the first tab 310 and the other is assembled with the second tab 320.

[0049] In some embodiments, the first wall surface 114 and the second wall surface 123 further define a second gap having a third port and a fourth port distributed opposite to each other along a first direction X. The insulating sheet 100 is configured to allow the second tab 320 to pass through the third port and the fourth port in sequence. In this way, the insulating sheet 100 can be assembled with both the first tab 310 and the second tab 320 simultaneously, and the insulating sheet 100 can reduce the probability of the second tab 320 coming into contact with a current collector of opposite polarity, thereby causing a short circuit, further improving the safety performance of the cell 10.

[0050] In some embodiments, the insulating sheet 100 satisfies at least one of the following conditions (h)-(j): (h) The first gap 150 is connected to the second gap; (i) The first port 151 is connected to the third port; (j) The second port 152 is connected to the fourth port.

[0051] In a specific embodiment, see Figure 1In one embodiment, the first wall surface 114 and the second wall surface 123 of the first sheet 110 can be spaced apart, thereby enabling the first gap 150 and the second gap to communicate, the first port 151 and the third port to communicate, and the second port 152 and the fourth port to communicate. The first electrode 310 and the second electrode 320 can pass through the gap between the first wall surface 114 and the second wall surface 123 simultaneously. In this solution, the processing of the first gap 150, the second gap, the first port 151, the second port 152, the third port, and the fourth port is simpler and more convenient, and the processing cost is low.

[0052] See Figure 15 A second aspect of this application also provides a battery cell 10, which includes the insulating sheet 100 and electrode assembly 300 as described above. The battery cell 10 also includes a housing 200 and electrode posts 400. The electrode assembly 300 is disposed within the housing 200, and the electrode post 400 passes through the housing 200, with its end located inside the housing 200 electrically connected to the electrode assembly 300, and its end located outside the housing 200 used to conduct electrical energy from the battery cell 10.

[0053] A third aspect of this application also provides a battery comprising one or more of the aforementioned cells 10.

[0054] A fourth aspect of this application also provides an electronic device comprising one or more of the aforementioned battery cells 10.

[0055] It should be noted that while preferred embodiments of this application are provided in the specification and accompanying drawings, this application can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are not intended to impose additional limitations on the content of this application; their purpose is to provide a more thorough and comprehensive understanding of the disclosure of this application. Furthermore, the above-described technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of this application's specification. Moreover, those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A battery cell, comprising an electrode assembly and an insulating sheet, the electrode assembly including a first tab, characterized in that, The insulating sheet includes: The first piece, including the first wall; A second sheet body is used to connect with the first sheet body. The second sheet body includes a second wall surface facing the first wall surface. The first wall surface and the second wall surface together define a first gap. The first gap has a first port and a second port that are distributed opposite to each other. Wherein, the direction from the first port to the second port is the first direction, the first direction intersects the direction perpendicular to the first wall surface, and the insulating sheet is configured to allow the first electrode to pass through the first port and the second port in sequence; Along the first direction, the first sheet includes a first side facing away from the first port, and the second sheet includes a second side facing away from the first port. The second side is located between the first side and the first port, and the second side and the first wall surface together define the second port.

2. The battery cell according to claim 1, characterized in that, At least one of the following conditions (a)-(d) must be met: (a) The first sheet and the second sheet are thermally fused together; (b) The first sheet and the second sheet are bonded together; (c) The insulating sheet includes a first connecting portion that clamps the first sheet body and the second sheet body. The first connecting portion includes a first part and a second part that are elastically connected to each other. The first part abuts against the wall surface of the first sheet body away from the first wall surface to generate an elastic thrust on the first sheet body in the direction from the first sheet body to the second sheet body. The second part abuts against the wall surface of the second sheet body away from the second wall surface to generate an elastic thrust on the second sheet body in the direction from the second sheet body to the first sheet body. (d) The insulating sheet includes a second connecting part, one end of which is fixedly connected to the first sheet body and the other end of which is fixedly connected to the second sheet body.

3. The battery cell according to claim 1, characterized in that, The first wall surface is provided with a protrusion, which is located on the side of the second port opposite to the first port.

4. The battery cell according to claim 1, characterized in that, Along the first direction, the first sheet includes a third side facing away from the second port, and the second sheet includes a fourth side facing away from the second port. The third side and the fourth side together define the first port.

5. The battery cell according to claim 1, characterized in that, The first sheet body is provided with a first through hole, which extends through the first sheet body along the thickness direction and includes the first port.

6. The battery cell according to claim 1, characterized in that, Along the first direction, the first sheet includes a third side facing away from the second port, and the second sheet includes a fourth side facing away from the second port. The insulating sheet includes a third connecting portion, one end of which is connected to the third side and the other end of which is connected to the fourth side.

7. The battery cell according to claim 6, characterized in that, The first sheet, the second sheet, and the third connecting portion are configured to be integrally formed from sheet material, and the third connecting portion is bent so that the first wall surface faces the second wall surface.

8. The battery cell according to claim 7, characterized in that, The third connecting part is provided with a plurality of second through holes arranged along the length direction of the third side, and each second through hole connects the gap between the first wall surface and the second wall surface.

9. The battery cell according to claim 6, characterized in that, One of the following conditions (e)-(g) must be met: (e) The first port is located at the third connection part; (f) The third connecting portion and the third side together define the first port; (g) The third connecting portion, the third side and the fourth side together define the first port.

10. The battery cell according to claim 1, characterized in that, The electrode assembly further includes a second electrode tab, which has a different polarity from the first electrode tab; The first wall and the second wall further define a second gap having a third port and a fourth port that are distributed opposite to each other along the first direction, and the insulating sheet is configured to allow the second electrode to pass through the third port and the fourth port in sequence.

11. The battery cell according to claim 10, characterized in that, At least one of the following conditions (h)-(j) must be met: (h) The first gap is connected to the second gap; (i) The first port is connected to the third port; (j) The second port is connected to the fourth port.

12. A battery, characterized in that, Includes the battery cell described in any one of claims 1-11.

13. An electronic device, characterized in that, Includes the battery cell described in any one of claims 1-11.

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