Battery cell assembly, battery, and electric device

Abstract

The present application discloses a battery cell assembly, a battery, and an electric device. The battery cell assembly comprises a battery cell and a circuit board. The battery cell comprises a pouch, an electrode assembly, and tabs. The pouch comprises a main body portion and sealing portions. The main body portion comprises a top wall, side walls, and connecting walls connected to the top wall and the side walls. Grooves are formed in the connecting walls relative to the top wall and the side walls. Each sealing portion comprises a first sealing portion connected to the top wall, a second sealing portion connected to a corresponding side wall, and a third sealing portion connected to a corresponding connecting wall. The tabs are connected to the electrode assembly, and the tabs extend out of the third sealing portions from the grooves. The circuit board and the top wall are arranged in a first direction. The first sealing portions are arranged between the circuit board and the top wall. The tabs are bent and connected to the circuit board, forming connection portions. Each first sealing portion is arranged spaced from a corresponding second sealing portion in a second direction. When viewed in a third direction, each connection portion is located between a corresponding first sealing portion and a corresponding second sealing portion in the second direction, thereby reducing the length of the battery cell assembly in the first direction, and improving the space utilization ratio.

Description

Battery cell assembly, battery and electric device

[0001] The present application claims priority to the Chinese patent application No. 202410740905.6 filed on June 07, 2024, and entitled "Battery cell assembly, battery and electric device". TECHNICAL FIELD

[0002] The present application relates to the technical field of energy storage, in particular to a battery cell assembly, a battery and an electric device. BACKGROUND

[0003] Battery cells are widely used in electronic devices, such as foldable screen mobile phones. The thinner the electronic device, the thinner the thickness requirement of the battery cell. Currently, reducing the thickness of the battery cell and improving the energy density of the battery cell have become the research and development direction in the field of battery cells. SUMMARY

[0004] Therefore, it is necessary to provide a battery cell assembly, a battery and an electric device, which can reduce the thickness of the battery cell and improve the energy density of the battery cell.

[0005] An embodiment of the present application provides a battery cell assembly, which comprises a battery cell and a circuit board. The battery cell comprises a packaging bag, an electrode assembly and a tab. The packaging bag comprises a main body part and a sealing part. The main body part comprises a top wall, a side wall and a connecting wall. The connecting wall connects the top wall and the side wall. The connecting wall forms a recess relative to the top wall and the side wall. The sealing part comprises a first sealing part, a second sealing part and a third sealing part. The first sealing part connects the top wall. The second sealing part connects the side wall. The third sealing part connects the connecting wall. The third sealing part connects the first sealing part and the second sealing part. The electrode assembly is accommodated in the packaging bag. The tab connects the electrode assembly. The tab extends from the recess to the third sealing part. The circuit board and the top wall are arranged along a first direction. Along the first direction, the first sealing part is arranged between the circuit board and the top wall. The tab is bent to connect a side of the circuit board facing the top wall and forms a connecting part. The first sealing part and the second sealing part are arranged in a second direction. Along the second direction, the connecting part is located between the first sealing part and the second sealing part observed along a third direction. The third direction is a thickness direction of the battery cell. The first direction, the second direction and the third direction are perpendicular to each other.

[0006] The first sealing part is arranged between the circuit board and the top wall, which reduces the impact of the circuit board on the packaging bag through the first sealing part, reduces the risk of damage to the packaging bag by the circuit board and causes liquid leakage. The circuit board and the top wall are arranged along the first direction, which reduces the space occupied by the circuit board in the first direction, reduces the length of the battery cell assembly in the first direction, and is beneficial to improve the space utilization. The connecting part is accommodated in the area between the first sealing part and the second sealing part, which further reduces the length of the battery cell assembly in the first direction and improves the space utilization.

[0007] In one or more optional embodiments above, a first region is formed between the first sealing portion and the second sealing portion along the second direction. A projection of the first region is located within a projection of the recess along the first direction, which is conducive to reducing the length of the battery cell assembly in the first direction and improving space utilization.

[0008] In one or more optional embodiments above, a projection of the first region overlaps with a projection of the connecting portion along the first direction, and the projection of the connecting portion is located within the projection of the recess, which is conducive to reducing the length of the battery cell assembly in the first direction and improving space utilization.

[0009] In one or more optional embodiments above, the insulating adhesive is further provided, and the insulating adhesive connects two sides of the tab along the thickness direction of the tab. Part of the insulating adhesive is connected to the third sealing portion, and part of the insulating adhesive extends out of the third sealing portion. The insulating adhesive is bent from the edge of the third sealing portion towards the third direction, which reduces the space occupied by the insulating adhesive in the first direction and facilitates the connection of the tab to the circuit board.

[0010] In one or more optional embodiments above, the width w1 of the first region in the second direction is greater than the width w2 of the insulating adhesive in the second direction, and the difference α between w1 and w2 satisfies 1mm≤α≤10mm. If α is less than 1mm, the distance between the insulating adhesive and the first sealing portion is too small. When the first sealing portion and the insulating adhesive are bent, the first sealing portion and the insulating adhesive are prone to interference, resulting in partial overlap of the first sealing portion and the insulating adhesive. The distance between the insulating adhesive and the second sealing portion 122 is too small. When the second sealing portion and the insulating adhesive are bent, the second sealing portion and the insulating adhesive are prone to interference, resulting in partial overlap of the second sealing portion and the insulating adhesive. This increases the space occupied by the battery cell assembly in the first direction and affects the process yield. If α is greater than 10mm, in the case where the width of the battery cell assembly in the second direction is unchanged, in order to ensure the width of the insulating adhesive in the second direction, the width of the recess 113a in the second direction Y needs to be increased, which reduces the space in the packaging bag 10 and the volume of the electrode assembly 20, resulting in a decrease in the energy density of the battery cell assembly 100. By setting α to 1mm≤α≤10mm, the present application reduces the interference between the first sealing portion and the insulating adhesive and the interference between the second sealing portion and the insulating adhesive, and reduces the impact on the process yield and the energy density.

[0011] In one or more optional embodiments above, 4mm≤α≤8mm, which can further reduce the loss of energy density while improving the process yield.

[0012] In one or more optional embodiments above, the circuit board comprises a conductive member, and the conductive member comprises a first connecting segment and a second connecting segment arranged in a bent manner. The tab is arranged between the first connecting segment and the second connecting segment, which facilitates the welding of the tab to at least one of the first connecting segment and the second connecting segment and forms the connecting portion.

[0013] In one or more optional embodiments above, the adapter is further included, the electrode assembly includes a notch portion, the notch portion is arranged at a corner position of the electrode assembly. In the first direction, the projection of the recess portion overlaps the projection of the notch portion, the adapter is arranged at the notch portion and connected to the electrode assembly, and the tab is connected to the adapter, which is conducive to improving the space utilization.

[0014] In one or more optional embodiments above, the electrode assembly includes a first tab, a second tab, and a separator arranged between the first tab and the second tab. The adapter includes a first adapter and a second adapter, the first adapter is welded to the first tab, and the second adapter is welded to the second tab.

[0015] In one or more optional embodiments above, the first tab, the second tab, and the separator are stacked, each first tab is welded to the first adapter, and each second tab is welded to the second adapter.

[0016] In one or more optional embodiments above, in the first direction, the projection of the circuit board is located within the projection of the main body portion, which reduces the space occupied by the circuit board in the third direction and is conducive to improving the space utilization.

[0017] In one or more optional embodiments above, in the third direction, the third sealing portion does not exceed the top wall in the first direction. When the first sealing portion is bent, the interference between the first sealing portion and the third sealing portion is reduced, which is conducive to the first sealing portion adhering to the top wall.

[0018] In one or more optional embodiments above, the first sealing portion is bent in the third direction, and the second sealing portion is bent in the third direction.

[0019] In one or more optional embodiments above, the thickness h of the battery cell satisfies 3mm≤h≤15mm. If h is less than 3mm, the thickness of the battery cell is too thin, the circuit board is easy to exceed the battery cell in the third direction, resulting in an increase in the space occupied by the battery cell assembly. If h is greater than 15mm, the thickness of the battery cell is too thick, the width of the top wall in the third direction increases, the first sealing portion bends to connect the top wall, and cannot cover the increased area of the top wall. The circuit board is easy to damage the top wall that is not covered by the first sealing portion, causing the risk of liquid leakage. By setting h to 3mm≤h≤15mm, the space occupied by the battery cell assembly in the third direction is reduced, and the risk of the packaging bag being damaged by the circuit board and causing liquid leakage is reduced.

[0020] In one or more optional embodiments above, 3mm≤h≤11mm, which further reduces the space occupied by the battery cell assembly in the third direction and further reduces the risk of the packaging bag being damaged by the circuit board and causing liquid leakage.

[0021] An embodiment of the present application further provides a battery, comprising the cell assembly in any of the above embodiments.

[0022] An embodiment of the present application further provides a battery, comprising the cell assembly in any of the above embodiments.

[0023] The cell assembly, the battery and the electrical equipment described above, the first sealing part is arranged between the circuit board and the top wall, the impact of the circuit board on the packaging bag is reduced through the first sealing part, the risk of damage to the packaging bag by the circuit board and liquid leakage is reduced. The circuit board and the top wall are arranged along the first direction, the space occupied by the circuit board in the first direction is reduced, the length of the cell assembly in the first direction is reduced, and the space utilization is improved. The area between the first sealing part and the second sealing part is accommodated through the connecting part, the length of the cell assembly in the first direction is further reduced, and the space utilization is improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 shows a structural schematic diagram of a cell assembly in some embodiments.

[0025] Fig. 2 shows a structural schematic diagram of the cell assembly in another view in some embodiments.

[0026] Fig. 3 shows an exploded schematic diagram of the cell assembly in some embodiments.

[0027] Fig. 4 shows an exploded schematic diagram of the cell assembly in another view in some embodiments.

[0028] Fig. 5 shows a structural schematic diagram of a cell in some embodiments.

[0029] Fig. 6 shows a structural schematic diagram of the cell in another state in some embodiments.

[0030] Fig. 7 shows a structural schematic diagram of the cell in another state in Fig. 5.

[0031] Fig. 8 shows a structural schematic diagram of the cell in another state in Fig. 7.

[0032] Fig. 9 shows an enlarged schematic diagram of part of the structure of the cell in Fig. 8.

[0033] Fig. 10 shows an exploded schematic diagram of the cell in some embodiments.

[0034] Fig. 11 shows a schematic diagram of part of the structure of the cell in some embodiments.

[0035] Fig. 12 shows an enlarged schematic diagram of part of the structure of the cell in Fig. 11.

[0036] Fig. 13 shows an enlarged schematic diagram of part of the structure of the cell in Fig. 11.

[0037] Fig. 14 shows a cross-sectional view of the battery cell of Fig. 8 along III-III.

[0038] Fig. 15 shows an enlarged view of a portion of the structure of the battery cell of Fig. 14.

[0039] Fig. 16 shows a cross-sectional view of the battery cell of Fig. 8 along IV-IV.

[0040] Fig. 17 shows an enlarged view of a portion of the structure of the battery cell of Fig. 16.

[0041] Fig. 18 shows a cross-sectional view of the battery cell of Fig. 11 along V-V.

[0042] Fig. 19 shows an enlarged view of a portion of the structure of the battery cell of Fig. 18.

[0043] Fig. 20 shows a cross-sectional view of the battery cell assembly of Fig. 1 along I-I.

[0044] Fig. 21 shows an enlarged view of a portion of the structure of the battery cell assembly of Fig. 20.

[0045] Fig. 22 shows a cross-sectional view of the battery cell assembly of Fig. 1 along II-II.

[0046] Fig. 23 shows an enlarged view of a portion of the structure of the battery cell assembly of Fig. 22.

[0047] Fig. 24 shows a schematic view of a battery and a device using power in some embodiments.

[0048] Main element symbol explanation: battery cell assembly 100 battery cell 100a packaging bag 10 main body part 11 top wall 111 side wall 112 connecting wall 113 concave part 113a sealing part 12 first sealing part 121 extending part 121a second sealing part 122 third sealing part 123 first area 101 electrode assembly 20 first pole piece 21 second pole piece 22 isolation film 23 notch part 20a pole lug 30 connecting part 30a circuit board 40 conductive piece 41 first connecting section 411 second connecting section 412 second bending section 413 electric connecting piece 42 insulating glue 50 adapter 60 first adapter 60a second adapter 60b first section61 first curved segment 62 second segment 63 battery 200 electrical device 300 first direction X second direction Y third direction Z

[0049] The following detailed embodiments will further illustrate the present application with reference to the above drawings. DETAILED DESCRIPTION

[0050] The following detailed description is presented to provide a basic understanding of the application. No limitation on the scope of the application is intended by omitting the discussion of some portions of the detailed description. Those of ordinary skill in the art will appreciate the scope of the application and embodiments thereof, as defined by the claims and their equivalents, upon reading this description with the attached drawings.

[0051] When it is said that a component is "on" another component, it can be directly on the other component or there can be intervening components present. When it is said that a component is "connected" to another component, it can be directly connected to the other component or there can be intervening components present.

[0052] It is understood that the term "vertical" is used to describe an ideal state. In actual production or use, the state between two components can be approximately vertical or equal. For example, in combination with numerical description, vertical can refer to the angle between two straight lines within the range of 90°±10°, vertical can also refer to the dihedral angle between two planes within the range of 90°±10°, and vertical can also refer to the angle between a straight line and a plane within the range of 90°±10°. The two components described as "vertical" can not be absolute straight lines or planes, but can be approximately straight lines or planes, and as a whole, the overall extension direction is a straight line or a plane, which can be considered as a "straight line" or a "plane".

[0053] Unless otherwise defined, the term "a plurality of" as used herein to describe a number of components refers to two or more of the components.

[0054] Some embodiments of the present application will be described in detail with reference to the drawings. The following embodiments and features of the embodiments can be combined with each other as long as there is no conflict.

[0055] Referring to FIGS. 1-10, one embodiment of the present application provides an electric cell assembly 100, which includes an electric cell 100a, the electric cell 100a including a packaging bag 10 and an electrode assembly 20, the electrode assembly 20 being disposed in the packaging bag 10.

[0056] In some embodiments, the packaging bag 10 includes a main body 11, the main body 11 being provided with a receiving space, the electrode assembly 20 being disposed in the receiving space.

[0057] In some embodiments, the main body 11 includes a top wall 111, a side wall 112, and a connecting wall 113, the connecting wall 113 connecting the top wall 111 and the side wall 112. The connecting wall 113 is formed with a recess 113a relative to the top wall 111 and the side wall 112.

[0058] In some embodiments, the main body 11 includes two side walls 112 and two connecting walls 113, one of the connecting walls 113 connecting one of the side walls 112 and the top wall 111, and the other of the connecting walls 113 connecting the other of the side walls 112 and the top wall 111.

[0059] In some embodiments, the packaging bag 10 includes a sealing portion 12, the sealing portion 12 connecting the main body 11, the sealing portion 12 including a first sealing portion 121, the first sealing portion 121 connecting the top wall 111.

[0060] In some embodiments, the sealing portion 12 includes a second sealing portion 122, the second sealing portion 122 connecting the side wall 112.

[0061] In some embodiments, the sealing portion 12 includes a third sealing portion 123, the third sealing portion 123 connecting the connecting wall 113.

[0062] In some embodiments, the third sealing portion 123 connects the first sealing portion 121 and the second sealing portion 122.

[0063] In some embodiments, the electric cell 100a includes a tab 30, the tab 30 connecting the electrode assembly 20, the tab 30 extending out of the third sealing portion 123 from the recess 113a.

[0064] In some embodiments, the electric cell 100a includes two tabs 30 of different polarities, one of the tabs 30 extending out of the third sealing portion 123 from the recess 113a of one of the connecting walls 113, and the other of the tabs 30 extending out of the third sealing portion 123 from the recess 113a of the other of the connecting walls 113.

[0065] In some embodiments, the electric cell assembly 100 includes a circuit board 40, the circuit board 40 and the top wall 111 being arranged along a first direction X, along the first direction X, the first sealing portion 121 being disposed between the circuit board 40 and the top wall 111, the tab 30 being bent to connect the circuit board 40 toward one side of the top wall 111, and forming a connecting portion 30a.

[0066] In some embodiments, the angle of the bent tab 30 is approximately 90°, reducing the rebound force of the tab 30 and facilitating assembly.

[0067] In some embodiments, the first sealing portion 121 and the second sealing portion 122 are spaced apart in the second direction Y, and the connecting portion 30a is located between the first sealing portion 121 and the second sealing portion 122 in the second direction Y when viewed in the third direction Z. The third direction Z is the thickness direction of the battery cell assembly 100, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0068] The first sealing portion 121 is arranged between the circuit board 40 and the top wall 111, reducing the impact of the circuit board 40 on the packaging bag 10 and reducing the risk of damage to the packaging bag 10 by the circuit board 40. Arranging the circuit board 40 and the top wall 111 in the first direction X reduces the space occupied by the circuit board 40 in the first direction X, reducing the length of the battery cell assembly 100 in the first direction X and improving space utilization. The connecting portion 30a is accommodated in the region between the first sealing portion 121 and the second sealing portion 122, further reducing the length of the battery cell assembly 100 in the first direction X and improving space utilization.

[0069] In some embodiments, the first sealing portion 121 is bent in the third direction Z. Optionally, the first sealing portion 121 after being bent in the third direction Z is in a state of approximately parallel or parallel to the third direction Z. For example, in combination with numerical description, parallel can refer to an included angle between two straight lines within the range of 0°±10°.

[0070] In some embodiments, the second sealing portion 122 is bent in the third direction Z. Optionally, the second sealing portion 122 after being bent in the third direction Z is in a state of approximately parallel or parallel to the third direction Z. For example, in combination with numerical description, parallel can refer to an included angle between two straight lines within the range of 0°±10°.

[0071] In some embodiments, the second sealing portion 122 is bent to connect the side wall 112, which facilitates reducing the space occupied by the battery cell assembly 100 in the second direction Y.

[0072] In some embodiments, the first sealing portion 121 and the second sealing portion 122 are spaced apart in the second direction Y, facilitating bending of the first sealing portion 121 and the second sealing portion 122, and facilitating the first sealing portion 121 to adhere to the top wall 111 and the second sealing portion 122 to adhere to the side wall 112, thereby reducing the space occupied by the battery cell assembly 100 in the first direction X and the second direction Y.

[0073] Referring to FIG. 7, in some embodiments, along the third direction Z, the third sealing portion 123 does not exceed the top wall 111 in the first direction X, reducing the interference between the first sealing portion 121 and the third sealing portion 123 when the first sealing portion 121 is bent, and facilitating the first sealing portion 121 to adhere to the top wall 111.

[0074] In some embodiments, along the third direction Z, the second sealing portion 122 does not exceed the top wall 111 in the direction opposite to the first direction X, reducing the space occupied by the second sealing portion 122 in the first direction X.

[0075] In some embodiments, along the third direction Z, the edge of the second sealing portion 122 in the second direction Y is located on the same straight line as the edge of the third sealing portion 123 in the second direction Y.

[0076] Referring to FIG. 7, in some embodiments, the first sealing portion 121 includes an extension portion 121a, which exceeds the top wall 111 in the second direction Y along the third direction Z. The projection of the extension portion 121a overlaps the projection of the connecting wall 113 in the first direction X. The extension portion 121a can increase the sealing area of the top wall 111 at the corner in the second direction Y, reducing the risk of liquid leakage. The extension portion 121a is located between the circuit board 40 and the connecting wall 113, reducing the impact of the circuit board 40 on the connecting portion of the connecting wall 113 and the top wall 111, and reducing the risk of damage to the packaging bag 10 by the circuit board 40, causing liquid leakage.

[0077] Referring to FIGS. 1-3 and 6, in some embodiments, along the second direction Y, a first area 101 is formed between the first sealing portion 121 and the second sealing portion 122, and along the first direction X, the projection of the first area 101 is located within the projection of the recess 113a, facilitating the reduction of the length of the battery cell assembly 100 in the first direction X and improving the space utilization.

[0078] In some embodiments, along the first direction X, the projection of the first area 101 overlaps the projection of the connecting portion 30a, and the projection of the connecting portion 30a is located within the projection of the recess 113a, facilitating the reduction of the length of the battery cell assembly 100 in the first direction X and improving the space utilization.

[0079] Please refer to FIG. 8, FIG. 9 and FIG. 21, in some embodiments, the electric cell 100a comprises an insulating adhesive 50, which connects both sides of the tab 30 along the thickness direction of the tab 30. The width of the insulating adhesive 50 is greater than the width of the tab 30 along the second direction Y. Part of the insulating adhesive 50 connects the third sealing portion 123, and part of the insulating adhesive 50 extends out of the third sealing portion 123. The insulating adhesive 50 is bent from the edge of the third sealing portion 123 towards the third direction Z, which reduces the space occupied by the insulating adhesive 50 in the first direction X, and facilitates the connection of the tab 30 to the circuit board 40. Optionally, the insulating adhesive 50 after being bent along the third direction Z is in a state of being approximately parallel or parallel to the third direction Z. For example, in combination with numerical description, parallel can refer to the included angle between two straight lines being within the range of 0°±10°.

[0080] In some embodiments, along the first direction X, the projection of the part of the insulating adhesive 50 extending out of the third sealing portion 123 does not overlap with the projection of the circuit board 40, which reduces the size of the insulating adhesive 50 extending out of the third sealing portion 123, and is conducive to improving the space utilization of the electric cell assembly 100 in the first direction X.

[0081] In some embodiments, the width w1 of the first region 101 in the second direction Y is greater than the width w2 of the insulating adhesive 50 in the second direction Y, and the difference a between w1 and w2 satisfies 1mm≤a≤10mm. If a is less than 1mm, the distance between the insulating adhesive 50 and the first sealing portion 121 is too small, and when the first sealing portion 121 and the insulating adhesive 50 are bent, the first sealing portion 121 and the insulating adhesive 50 are prone to interference, resulting in partial overlap of the first sealing portion 121 and the insulating adhesive 50, and the distance between the insulating adhesive 50 and the second sealing portion 122 is too small, and when the second sealing portion 122 and the insulating adhesive 50 are bent, the second sealing portion 122 and the insulating adhesive 50 are prone to interference, resulting in partial overlap of the second sealing portion 122 and the insulating adhesive 50, which affects the process yield. In the case where the width of the electric cell assembly 100 in the second direction Y is unchanged, if a is greater than 10mm, in order to ensure the width of the insulating adhesive 50 in the second direction Y, the width of the recess 113a in the second direction Y needs to be increased, which reduces the space inside the packaging bag 10 and the volume of the electrode assembly 20, resulting in a decrease in the energy density of the electric cell assembly 100. By setting a to 1mm≤a≤10mm, the present application reduces the interference between the first sealing portion 121 and the insulating adhesive 50 and the interference between the second sealing portion 122 and the insulating adhesive 50, and reduces the impact on the process yield and the energy density.

[0082] Optionally, a can be any one of 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm.

[0083] In some embodiments, a is set to 4mm≤a≤8mm, which can further reduce the loss of energy density and improve the process yield.

[0084] The difference a will be further described below through specific examples.

[0085] The following data were obtained by testing 10 battery cells 100a with a length, width and height of 79.78 mm*70.97 mm*4.82 mm for each example, wherein the energy density was the average value of multiple battery cells 100a tested in each example.

[0086] Table 1

[0087] From Examples 1 to 6, it can be known that when a is less than 1, the process yield is poor, and when a is greater than 10, the process yield is high, but the energy density is lost.

[0088] Referring to FIG. 23, in some embodiments, along the second direction Y, the projection of the portion of the insulating adhesive 50 extending out of the third sealing portion 123 overlaps the projection of the first sealing portion 121, which is beneficial to improve the space utilization of the battery cell assembly 100 in the first direction X.

[0089] Referring to FIGS. 10 to 19, in some embodiments, the electrode assembly 20 includes a notch portion 20a, which is arranged at a corner position of the electrode assembly 20, and along the first direction X, the projection of the notch portion 20a overlaps the projection of the recessed portion 113a, which is beneficial to improve the space utilization.

[0090] Referring to FIG. 10, in some embodiments, the junction position of the side opposite to the electrode assembly 20 and the connecting wall 113 and the side opposite to the electrode assembly 20 and the side wall 112 is the corner position of the electrode assembly 20.

[0091] In some embodiments, the battery cell 100a includes a adapter 60, which is arranged at the notch portion 20a and connects the electrode assembly 20 and the tab 30.

[0092] In some embodiments, along the first direction X, the projection of the adapter 60 is located within the projection of the notch portion 20a, which is beneficial to improve the space utilization.

[0093] In some embodiments, the adapter 60 includes a first section 61, a first curved section 62 and a second section 63. The first curved section 62 connects the first section 61 and the second section 63. The first section 61 and the second section 63 are arranged in a spaced manner. Along the first direction X, the side of the first section 61 away from the second section 63 is welded to connect the electrode assembly 20, and the side of the second section 63 away from the first section 61 is welded to connect the tab 30. By arranging the first section 61 and the second section 63 in a spaced manner, the first section 61 is facilitated to be welded to connect the electrode assembly 20 and the second section 63 is facilitated to be welded to connect the tab 30.

[0094] In some embodiments, the electrode assembly 20 includes the first tab 21, the second tab 22, and the separator 23 disposed between the first tab 21 and the second tab 22.

[0095] In some embodiments, the adapter 60 includes a first adapter 60a, and the first adapter 60a is welded to the first tab 21.

[0096] In some embodiments, the adapter 60 includes a second adapter 60b, and the second adapter 60b is welded to the second tab 22.

[0097] In some embodiments, the first tab 21, the separator 23, and the second tab 22 are sequentially stacked, and the first adapter 60a is welded to each of the first tab 21. The second adapter 60b is welded to each of the second tab 22.

[0098] In some embodiments, the first tab 21, the separator 23, and the second tab 22 are sequentially stacked, and the first adapter 60a is welded to each of the first tab 21. The second adapter 60b is welded to each of the second tab 22.

[0099] Please refer to FIG. 17 and FIG. 18, the distance d1 between the electrode assembly 20 and the top wall 111 is less than the distance d2 between the electrode assembly 20 and the connecting wall 113. By extending the tab 30 from the connecting wall 113, accommodating the adapter 60 and the tab 30 through the recess 113a, the distance between the top wall 111 and the electrode assembly 20 is reduced, the length of the battery cell assembly 100 in the first direction X is reduced, and the space utilization is improved.

[0100] Please refer to FIG. 20 to FIG. 23, in some embodiments, the projection of the circuit board 40 is located within the projection of the main body 11 in the first direction X, the space occupied by the circuit board 40 in the third direction Z is reduced, and the space utilization is improved.

[0101] In some embodiments, the circuit board 40 includes a conductive piece 41, and the conductive piece 41 is welded to the tab 30. In the second direction Y, the conductive piece 41 is located between the first sealing portion 121 and the second sealing portion 122 in the third direction Z.

[0102] In some embodiments, the conductive piece 41 includes a first connecting segment 411 and a second connecting segment 412, and the first connecting segment 411 and the second connecting segment 412 are spaced apart in the first direction X. The tab 30 is disposed between the first connecting segment 411 and the second connecting segment 412, and the tab 30 is welded to at least one of the first connecting segment 411 and the second connecting segment 412 to form a connecting portion 30a.

[0103] In some embodiments, the conductive piece 41 comprises a second bending segment 413 connecting the first connecting segment 411 and the second connecting segment 412.

[0104] In some embodiments, the circuit board 40 comprises two conductive pieces 41, which are located at two ends of the circuit board 40 along the second direction Y. One of the two conductive pieces 41 is welded to one of the tab 30, and the other conductive piece 41 is welded to the other tab 30 with different polarity.

[0105] In some embodiments, the circuit board 40 comprises an electrical connecting piece 42 connecting an external device.

[0106] Referring to FIG. 23, in some embodiments, the projection of the first sealing part 121 overlaps with the projection of the tab 30 along the direction opposite to the second direction Y, which is conducive to reducing the length of the battery cell 100a along the first direction X and improving the space utilization.

[0107] In some embodiments, the projection of the first sealing part 121 overlaps with the projection of the second connecting segment 412 along the direction opposite to the second direction Y, which is further conducive to reducing the length of the battery cell 100a along the first direction X and improving the space utilization.

[0108] In some embodiments, the projection of the first sealing part 121 overlaps with the projection of the first connecting segment 411 along the direction opposite to the second direction Y, which is further conducive to reducing the length of the battery cell 100a along the first direction X and improving the space utilization.

[0109] Referring to FIG. 22, in some embodiments, the thickness h of the battery cell 100a satisfies 3mm≤h≤15mm. If h is less than 3mm, the thickness of the battery cell 100a is too thin, and the circuit board 40 is easy to exceed the battery cell 100a along the third direction Z, resulting in an increase in the space occupied by the battery cell assembly 100. If h is greater than 15mm, the thickness of the battery cell 100a is too thick, the width of the top wall 111 along the third direction Z increases, the first sealing part 121 bends to connect the top wall 111, and cannot cover the increased area of the top wall 111, the circuit board 40 is easy to damage the top wall 111 not covered by the first sealing part 121, causing the risk of liquid leakage. By setting h to 3mm≤h≤15mm, the present application reduces the space occupied by the battery cell assembly 100 in the third direction Z, and reduces the risk of damage to the packaging bag 10 by the circuit board 40, causing liquid leakage.

[0110] Optionally, h can be any one of 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, and 15mm.

[0111] In some embodiments, 3mm≤h≤11mm, further reducing the space occupied by the battery cell assembly 100 in the third direction Z, further reducing the risk of the packaging bag 10 being damaged by the circuit board 40, causing liquid leakage.

[0112] Referring to FIG. 24, the application also provides a battery 200 using the above-mentioned battery cell assembly 100.

[0113] Referring to FIG. 24, the application also provides an electrical device 300 using the above-mentioned battery 200. In an embodiment, the electrical device 300 of the application can be, but is not limited to, an electronic device, a drone, a backup power supply, an electric vehicle, an electric motorcycle, an electric power-assisted bicycle, an electric tool, a household large-scale battery module, etc.

[0114] Those skilled in the art should recognize that the above embodiments are only used to illustrate the application, and are not used as a limitation of the application. Any appropriate changes and variations made to the above embodiments within the spirit and principles of the application fall within the scope of the present disclosure.

Claims

1. An electrochemical cell assembly, comprising: The battery cell includes an electrode assembly and a circuit board. The package bag includes a main body and a sealing portion. The electrode assembly is accommodated in the package bag. The electrode assembly includes a first tab and a second tab. The first tab and the second tab are connected to the electrode assembly. The first sealing portion and the second sealing portion are spaced apart in a second direction.

2. The cell assembly of claim 1, wherein, The first direction, the second direction, and a third direction are perpendicular to each other.

3. The cell assembly of claim 2, wherein, The first region is located between the first sealing portion and the second sealing portion in the second direction.

4. The cell assembly of claim 3, wherein, The first region is located between the first sealing portion and the second sealing portion in the second direction.

5. The cell assembly of claim 4, wherein, The first region is located between the first sealing portion and the second sealing portion in the second direction.

6. The cell assembly of claim 5, wherein, The first region is located between the first sealing portion and the second sealing portion in the second direction.

7. The cell assembly of any one of claims 1 to 6, wherein, The first region is located between the first sealing portion and the second sealing portion in the second direction.

8. The cell assembly of any one of claims 1 to 6, wherein, The first region is located between the first sealing portion and the second sealing portion in the second direction.

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10. The cell assembly of claim 9, wherein, The first tab, the second tab, and the separator are stacked, the first adapter is welded to each of the first tabs, and the second adapter is welded to each of the second tabs.

11. The cell assembly of claim 1, wherein, In the first direction, a projection of the circuit board is within a projection of the main body.

12. The cell assembly of claim 1, wherein, In the third direction, the third seal does not exceed the top wall in the first direction.

13. The cell assembly of claim 1, wherein, The first seal is bent in the third direction, and the second seal is bent in the third direction.

14. The cell assembly of claim 1, wherein, The thickness h of the cell satisfies 3mm≤h≤15mm.

15. The cell assembly of claim 14, wherein, 3mm≤h≤11mm.

16. A battery, characterized by An electric cell assembly including any one of claims 1 to 15.

17. An electrical device, characterized by A battery including claim 16.

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