Electrochemical device and electric equipment

Abstract

The invention discloses an electrochemical device and electric equipment. An electrochemical device includes a cell and a circuit board assembly. The battery cell comprises a battery cell shell, an electrode assembly, a first electrode terminal and a second electrode terminal. The battery cell shell comprises a main body part and a top sealing part; the electrode assembly is accommodated in the main body part; the top package portion includes a first package region and a second package region. The main body part comprises a top wall, and the top wall comprises a first sub-wall, a second sub-wall and a first connecting wall connecting the first sub-wall and the second sub-wall. The distance between the first sub-wall and the electrode assembly is smaller than the distance between the second sub-wall and the electrode assembly. An accommodating space is formed among the first packaging area, the first sub-wall and the first connecting wall. The circuit board assembly comprises a circuit board, a first conductive part and a second conductive part. The circuit board is located in the accommodating space. The first conductive part and the second conductive part are connected to the first electrode terminal and the second electrode terminal respectively, and the first conductive part and the second conductive part are both overlapped with the second packaging area.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an electrochemical device and electrical equipment. Background Art

[0002] Influenced by electronic products, batteries used for charging and discharging in electronic products are gradually developing in the direction of thinning and compact structure so as to be suitable for smaller and thinner electronic products. At present, since the head of the battery usually occupies a large space, it is difficult to increase the energy density of the battery. Summary of the invention

[0003] In view of this, the present application provides an electrochemical device that is beneficial for reducing occupied space.

[0004] In a first aspect, the present application provides an electrochemical device, comprising a battery cell and a circuit board assembly. The battery cell comprises a battery cell shell, an electrode assembly, a first electrode terminal and a second electrode terminal. The battery cell shell comprises a main body and a top seal extending from the main body along a first direction, and the electrode assembly is accommodated in the main body. The top seal comprises a first packaging area and a second packaging area arranged along a second direction, the first electrode terminal is connected to the electrode assembly and extends out of the battery cell shell from the second packaging area, and the second electrode terminal is connected to the electrode assembly and extends out of the battery cell shell from the second packaging area. The main body comprises a top wall, and the top wall comprises a first sub-wall, a second sub-wall and a first connecting wall connecting the first sub-wall and the second sub-wall. In the first direction, the first sub-wall has a first distance from the electrode assembly, and the second sub-wall has a second distance from the electrode assembly, and the first distance is less than the second distance. An accommodating space is formed between the first packaging area, the first sub-wall and the first connecting wall. The circuit board assembly comprises a circuit board and a first conductive part and a second conductive part connected to the circuit board. In the third direction, the circuit board overlaps with the first packaging area, and at least part of the circuit board is located in the accommodating space. The first conductive part and the second conductive part are independently arranged and respectively connected to the first electrode terminal and the second electrode terminal. Along the third direction, the first conductive part overlaps with the second packaging area, and the second conductive part overlaps with the second packaging area. The third direction is the thickness direction of the battery cell shell. The first direction, the second direction and the third direction are perpendicular to each other.

[0005] In the present application, two independently arranged conductive parts are used to electrically connect the circuit board and the two electrode terminals, which is conducive to reducing the width of the conductive part, thereby reducing the occupied space of the electrochemical device. In addition, the top wall of the battery cell includes a first sub-wall and a second sub-wall, and the first distance between the first sub-wall and the electrode assembly is less than the second distance between the second sub-wall and the electrode assembly, so that an accommodation space is formed between the first sub-wall, the first connecting wall and the first packaging area, which reduces the volume of the battery cell head and further reduces the occupied space of the electrochemical device. Furthermore, the circuit board is arranged in the accommodation space, and the first conductive part and the second conductive part are arranged to overlap with the second packaging area, which can reduce the influence of the width of the circuit board assembly on the overall width of the electrochemical device, thereby reducing the occupied space of the electrochemical device and improving the energy density of the electrochemical device.

[0006] Based on the first aspect, in some embodiments, the first electrode terminal includes a first portion exposed to the battery cell housing, the first portion overlaps with the second packaging area along the third direction, a first space is provided between the first portion and the second packaging area, and a portion of the first conductive portion is located in the first space; the second electrode terminal includes a second portion exposed to the battery cell housing, the second portion overlaps with the second packaging area along the third direction, a second space is provided between the second portion and the second packaging area, and a portion of the second conductive portion is located in the second space. The first conductive portion and the second conductive portion are respectively arranged in the first space and the second space, so that the first conductive portion and the second conductive portion share space with the first electrode terminal and the second electrode terminal respectively without occupying additional space, thereby further improving the energy density of the electrochemical device.

[0007] Based on the first aspect, in some embodiments, the circuit board, the first electrode terminal and the second electrode terminal are arranged in sequence along the second direction.

[0008] Based on the first aspect, in some embodiments, along the third direction, the circuit board includes a first surface facing the top seal portion and a second surface facing away from the top seal portion, the first conductive portion is welded to the second surface, and along the third direction, part of the second conductive portion is located between the first conductive portion and the top seal portion.

[0009] Based on the first aspect, in some embodiments, along the third direction, the circuit board includes a first surface facing the top seal portion and a second surface facing away from the top seal portion, the first conductive portion includes a first connecting portion, a second connecting portion, and a first bending portion connecting the first connecting portion and the second connecting portion, the first connecting portion is welded to the first surface, the first connecting portion and the second connecting portion are arranged opposite to each other along the third direction, the first bending portion extends along the third direction, a first penetration space is formed between the first connecting portion, the second connecting portion and the first bending portion, and along the third direction, the second conductive portion is located on a side of the first conductive portion away from the top seal portion, and part of the second conductive portion is located in the first penetration space. In this way, the second conductive portion and the first conductive portion share a space without occupying additional space, which is conducive to reducing the occupied space of the electrochemical device.

[0010] Based on the first aspect, in some embodiments, the second conductive part is a flexible circuit board, and the circuit board assembly further includes a conductive member electrically connected to the flexible circuit board and the first electrode terminal.

[0011] Based on the first aspect, in some embodiments, along the third direction, the circuit board includes a first surface facing the top sealing part and a second surface facing away from the top sealing part, the first conductive part includes a first connecting part, a second connecting part, and a first bending part connecting the first connecting part and the second connecting part, the first connecting part is connected to the circuit board, the first connecting part and the second connecting part are arranged opposite to each other along the third direction, the first bending part extends along the third direction, a first penetration space is formed between the first connecting part, the second connecting part and the first bending part, the second conductive part is welded to the second surface, and along the third direction, the second conductive part is located on the side of the first conductive part away from the top sealing part, and part of the second conductive part is located in the first penetration space.

[0012] Based on the first aspect, in some embodiments, along the third direction, the circuit board includes a first surface facing the top seal portion and a second surface facing away from the top seal portion, the second conductive portion is welded to the first surface, and along the third direction, part of the first conductive portion is located between the second conductive portion and the top seal portion.

[0013] Based on the first aspect, in some embodiments, the first electrode terminal, the circuit board, and the second electrode terminal are arranged in sequence along the second direction.

[0014] Based on the first aspect, in some embodiments, along the first direction, the first packaging area includes a first edge away from the main body, the first edge has a third distance from the electrode assembly, the second packaging area includes a second edge away from the main body, the second edge has a fourth distance from the electrode assembly, and the third distance is less than the fourth distance; the top seal includes a third edge connecting the first edge and the second edge, and a gap is formed between the first edge and the third edge; the circuit board assembly also includes components arranged on the circuit board, at least some of the components are located in the gap. Providing a gap at the edge of the battery cell shell and arranging the components of the circuit board assembly in the gap can reduce the influence of the height of the components on the overall thickness of the electrochemical device, thereby reducing the occupied space of the electrochemical device.

[0015] Based on the first aspect, in some embodiments, the third distance is D3, the fourth distance is D4, 0.5 mm ≤ D4-D3 ≤ 4 mm. When D4-D3 is within the above range, the gap can be large enough to accommodate components, and the electrochemical device has a higher energy density.

[0016] Based on the first aspect, in some embodiments, the first distance is D1, the second distance is D2, and 0.5 mm ≤ D2-D1 ≤ 3 mm. When D2-D1 is within the above range, the accommodation space can be large enough and the electrochemical device has a higher energy density.

[0017] Based on the first aspect, in some embodiments, the circuit board is a rigid circuit board, and the first conductive part and the second conductive part are flexible conductive parts. The rigid circuit board can provide a supporting function for supporting components of the circuit board assembly, etc. The conductive part is set to be flexible, which facilitates the processing of the conductive part to reduce the width of the conductive part, and based on the flexibility of the flexible conductive part, the arrangement of the circuit board assembly and the battery cell is more flexible.

[0018] Based on the first aspect, in some embodiments, the first conductive part is a bus bar or a flexible circuit board, and / or the second conductive part is a bus bar or a flexible circuit board.

[0019] A second aspect of the present application provides an electrical equipment, comprising any one of the above-mentioned electrochemical devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of an electrochemical device provided in one embodiment of the present application.

[0021] Figure 2 A schematic diagram of an exploded view of a battery cell provided in accordance with an embodiment of the present application.

[0022] Figure 3 A partial exploded schematic diagram of an electrochemical device provided in one embodiment of the present application.

[0023] Figure 4 A schematic structural diagram of an electrochemical device provided in another embodiment of the present application.

[0024] Figure 5 This is a schematic diagram of an electrochemical device provided in another embodiment of the present application.

[0025] Figure 6 A schematic diagram of the partial structure of an electrochemical device provided in yet another embodiment of the present application.

[0026] Figure 7 A schematic diagram of the partial structure of an electrochemical device provided in yet another embodiment of the present application.

[0027] Figure 8 A schematic diagram of the partial structure of an electrochemical device provided in yet another embodiment of the present application.

[0028] Fig. 9 A partial exploded schematic diagram of an electrochemical device provided in yet another embodiment of the present application.

[0029] Fig.10A schematic diagram of the structure of an electrical device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0031] It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a central component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time.

[0032] It is worth noting that when two components or members are "electrically connected", it can be considered that the two members are electrically connected by direct contact, welding connection, adhesive connection, etc. The term "and / or" includes any and all combinations of one or more related listed items.

[0033] The term "perpendicular" is used to describe the ideal state between two components. In actual production or use, there may be a state that is approximately perpendicular between the two components. For example, in combination with numerical descriptions, perpendicularity can refer to the angle between two straight lines being between 90°±10°, perpendicularity can also refer to the dihedral angle between two planes being between 90°±10°, and perpendicularity can also refer to the angle between a straight line and a plane being between 90°±10°. The two components described as "perpendicular" may not be absolute straight lines or planes, but may be roughly straight lines or planes. From a macroscopic perspective, a component can be considered a "straight line" or a "plane" if the overall extension direction is a straight line or a plane.

[0034] It should be noted that when a parameter is greater than, equal to or less than a certain endpoint value, it should be understood that the endpoint value is allowed to have a tolerance of ±10%. For example, if the ratio of A to B is greater than 10, it should be understood to include the case where the ratio of A to B is greater than 9, and also include the case where the ratio of A to B is greater than 11.

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

[0036] Some embodiments of the present application will be described below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0037] See also Figure 1 and Figure 2An embodiment of the present application provides an electrochemical device 1, which includes a battery cell 100. The battery cell 100 includes an electrode assembly 10, a battery cell shell 20, and an electrode terminal. The electrode assembly 10 is disposed in the battery cell shell 20, and the electrode terminal is connected to the electrode assembly 10 and extends from the battery cell shell 20 to be electrically connected to an external component (such as a circuit board). The electrode terminal includes a first electrode terminal 31 and a second electrode terminal 32 with opposite polarities, and the first electrode terminal 31 and the second electrode terminal 32 are each connected to the electrode assembly 10 and extend from one side of the battery cell shell 20.

[0038] The electrode assembly 10 is used to convert chemical energy into electrical energy. The electrode assembly 10 includes a positive electrode sheet, a negative electrode sheet, and a separator disposed between the positive electrode sheet and the negative electrode sheet. Optionally, the positive electrode sheet, the separator, and the negative electrode sheet are stacked in sequence and then wound to form a winding structure, or the positive electrode sheet, the separator, and the negative electrode sheet are stacked in sequence to form a laminated structure.

[0039] See also Figure 1 and Figure 3 The battery cell shell 20 includes a main body 21 and a packaging part. The main body 21 is provided with a accommodating cavity, and the accommodating cavity is used to accommodate the electrode assembly 10 and the electrode terminal. The packaging part extends from the main body 21 along at least one side away from the main body 21, and is used to seal the accommodating cavity. The packaging part is the part that is sealed by hot pressing or bonding after the battery cell shell 20 accommodates the electrode assembly 10. Optionally, the battery cell shell 20 can adopt a flexible packaging film (such as an aluminum-plastic film, a steel-plastic film), or a hard plastic shell.

[0040] The packaging portion includes a top sealing portion 22, which extends from the main body 21 along the first direction X. The top sealing portion 22 includes a first packaging area 221 and a second packaging area 222 arranged along the second direction Y. The second direction Y is perpendicular to the first direction X. The first electrode terminal 31 and the second electrode terminal 32 both extend from the battery cell housing 20 from the second packaging area 222. The first packaging area 221 is an area in the top sealing portion 22 where no electrode terminal extends. In some embodiments, the first packaging area 221 and the second packaging area 222 are arranged in sequence along the second direction Y. In some embodiments, the packaging portion also includes a side sealing portion 23, which extends from the main body 21 along the second direction Y and is connected to the top sealing portion 22. The side sealing portions 23 may be located on opposite sides of the main body 21 in the second direction Y.

[0041] The main body 21 includes a top wall 211, and the top seal 22 extends from the top wall 211. The top wall 211 includes a first sub-wall 2111, a second sub-wall 2112, and a first connecting wall 2113 connecting the first sub-wall 2111 and the second sub-wall 2112. The first sub-wall 2111 is connected to the first packaging area 221, and the second sub-wall 2112 is connected to the second packaging area 222. Along the first direction X, the first sub-wall 2111 and the electrode assembly 10 have a first distance D1, and the second sub-wall 2112 and the electrode assembly 10 have a second distance D2, and the first distance D1 is smaller than the second distance D2. The first distance D1 is smaller than the second distance D2, so that a storage space is formed between the second sub-wall 2112 and the electrode assembly 10, and the storage space is used to accommodate internal components, such as accommodating a portion of a pole ear used to connect the electrode terminal and the electrode assembly 10 and welded to the electrode terminal. The first sub-wall 2111 can be separated from or in contact with the electrode assembly 10, which is not limited here. The first distance D1 is smaller than the second distance D2, and an accommodation space 20A is formed between the first sub-wall 2111, the first connecting wall 2113 and the first packaging area 221. The accommodation space 20A is used to accommodate external components, such as a portion of a circuit board. By providing the accommodation space 20A, the occupied space of the battery cell 100 can be reduced, which is beneficial to improving the energy density of the electrochemical device 1.

[0042] In some embodiments, 0.5mm≤D2-D1≤3mm, for example, D2-D1 is 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm or a range consisting of any two of these values, so as to take into account the size of the accommodating space between the second sub-wall 2112 and the electrode assembly 10 and the energy density of the battery cell 100, so that the accommodating space 20A is large enough to accommodate external components and the electrochemical device 1 has a higher energy density.

[0043] See also Figure 1 and Figure 3, the electrochemical device 1 further includes a circuit board assembly 40. The circuit board assembly 40 is located on one side of the main body 21 along the first direction X and is electrically connected to the electrode terminal. The circuit board assembly 40 includes a circuit board 41, a first conductive portion 42 and a second conductive portion 43. The first conductive portion 42 and the second conductive portion 43 are both connected to the circuit board 41. The first conductive portion 42 and the second conductive portion 43 are independently arranged. The first electrode terminal 31 is electrically connected to the circuit board 41 through the first conductive portion 42. The second electrode terminal 32 is electrically connected to the circuit board 41 through the second conductive portion 43. Compared with the situation where the first electrode terminal 31 and the second electrode terminal 32 are connected to the circuit board 41 through the same conductive portion, in the present application, the first electrode terminal 31 and the second electrode terminal 32 are respectively connected to the circuit board 41 through two independently arranged conductive portions, and the width of a single conductive portion in the first direction X can be reduced, reducing the influence of the width of the conductive portion in the first direction X on the overall width of the electrochemical device 1, thereby facilitating the reduction of the occupied space of the electrochemical device 1 in the first direction X.

[0044] Along the third direction Z, the circuit board 41 overlaps with the first packaging area 221, and at least part of the circuit board 41 is located in the accommodation space 20A. The third direction Z is the thickness direction of the battery cell housing 20, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other. In some embodiments, the circuit board 41 is supported on the battery cell housing 20 of the first packaging area 221. Placing the circuit board 41 in the accommodation space 20A can reduce the influence of the width of the circuit board 41 in the first direction X on the overall width of the electrochemical device 1, thereby helping to reduce the occupied space of the electrochemical device 1.

[0045] Along the third direction Z, the first conductive portion 42 overlaps with the second packaging area 222, and the second conductive portion 43 overlaps with the second packaging area 222. By arranging the first conductive portion 42 and the second conductive portion 43 to overlap with the second packaging area 222, the conductive portion and the second packaging area 222 share a certain space in the first direction X, further reducing the influence of the width of the conductive portion in the first direction X on the overall width of the electrochemical device 1, thereby reducing the occupied space of the electrochemical device 1.

[0046] In some embodiments, the circuit board 41 is a rigid circuit board. A rigid circuit board refers to a hard board made of a glass fiber copper clad laminate or the like as a substrate, which cannot be bent or flexed, has a certain mechanical strength, and can play a supporting role.

[0047] In some embodiments, the first conductive part 42 and the second conductive part 43 are flexible conductive parts. The flexible conductive part is made of a flexible material and can be bent and flexed. The conductive part is set to be flexible, which facilitates the processing of the conductive part to reduce the width of the conductive part, and based on the flexibility of the flexible conductive part, the arrangement of the circuit board assembly 40 and the battery cell 100 is more flexible.

[0048] In some embodiments, the first conductive part 42 is a bus or a flexible circuit board, and / or the second conductive part 43 is a bus or a flexible circuit board. A flexible printed circuit (FPC) is a circuit board formed by printing or attaching functional components such as wires and thin wires on a flexible substrate, such as a flexible polyimide film, a polyester film, etc. as a substrate. A flexible circuit board has the characteristics of being bendable, foldable, and winding. In the case where the conductive part is a flexible circuit board, the flexible circuit board and the circuit board 41 can be formed into a hard-soft combination board or a flexible circuit board welded to the circuit board 41 through processes such as lamination. A bus refers to a carrier that connects multiple electrode terminals to transmit the total current of the battery cell 100 or charge the charging current into the battery cell 100. The bus can be a metal plate or a metal wire, and the metal plate can be an aluminum plate or a copper plate, etc. In the case where the conductive part is a bus, the bus is welded to the circuit board 41.

[0049] The first electrode terminal 31 includes a first portion 311 exposed to the cell housing 20. In some embodiments, along the third direction Z, the first portion 311 overlaps with the second packaging area 222, and a first space 31A is provided between the first portion 311 and the second packaging area 222. Specifically, the first portion 311 includes a first region 3111 and a second region 3112 connected to each other, the first region 3111 extends along the third direction Z, and the second region 3112 extends from the first region 3111 in a direction opposite to the first direction X. Along the third direction Z, the second region 3112 overlaps with the second packaging area 222. The first region 3111, the second region 3112, and the second packaging area 222 form a first space 31A. Part of the first conductive portion 42 is located in the first space 31A. By disposing the first conductive portion 42 in the first space 31A, the entire first conductive portion 42 can share space with the second packaging area 222 and the first electrode terminal 31 without occupying additional space, thereby further improving the energy density of the electrochemical device 1.

[0050] The second electrode terminal 32 includes a second portion 321 exposed to the cell housing 20. In some embodiments, along the third direction Z, the second portion 321 overlaps with the second packaging area 222, and a second space 32A is provided between the second portion 321 and the second packaging area 222. Specifically, the second portion 321 includes a first segment 3211 and a second segment 3212 connected to each other, the first segment 3211 extends along the third direction Z, and the second segment 3212 extends from the first segment 3211 in a direction opposite to the first direction X. Along the third direction Z, the second segment 3212 overlaps with the second packaging area 222. The first segment 3211, the second segment 3212 and the second packaging area 222 form a second space 32A. Part of the second conductive portion 43 is located in the second space 32A. By disposing the second conductive portion 43 in the second space 32A, the entire second conductive portion 43 can share space with the second packaging area 222 and the second electrode terminal 32 without occupying additional space, thereby further improving the energy density of the electrochemical device 1.

[0051] Along the first direction X, the first packaging area 221 includes a first edge 221A away from the main body 21, and the first edge 221A has a third distance D3 from the electrode assembly 10, and the second packaging area 222 includes a second edge 222A away from the main body 21, and the second edge 222A has a fourth distance D4 from the electrode assembly 10. In some embodiments, the third distance D3 is less than the fourth distance D4, and the top seal portion 22 includes a third edge 22A connecting the first edge 221A and the second edge 222A, and a gap 20B is formed between the first edge 221A and the third edge 22A. The circuit board assembly 40 also includes components 44 provided on the circuit board 41, and at least part of the components 44 is located in the gap 20B, which reduces the influence of the height of the components 44 in the third direction Z on the overall thickness of the electrochemical device 1, thereby facilitating the reduction of the occupied space of the electrochemical device 1.

[0052] In some embodiments, 0.5 mm ≤ D4-D3 ≤ 4 mm, for example, D4-D3 is 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm or a range consisting of any two of these values, so as to take into account the size of the notch 20B and the energy density of the electrochemical device 1, so that the notch 20B is large enough to accommodate the component 44 and the electrochemical device 1 has a higher energy density.

[0053] In some embodiments, the circuit board 41 , the first electrode terminal 31 , and the second electrode terminal 32 are sequentially arranged along the second direction Y. The first conductive portion 42 and the second conductive portion 43 protrude from one side of the circuit board 41 in the second direction Y and are connected to the first electrode terminal 31 and the second electrode terminal 32 , respectively.

[0054] Along the third direction Z, the circuit board 41 includes a first surface 411 facing the top seal portion 22, a second surface 412 facing away from the top seal portion 22, and a side surface 413 connecting the first surface 411 and the second surface 412. Figure 1 and Figure 3 The first conductive part 42 is welded to the second surface 412, the second conductive part 43 is connected to the side surface 413, and along the third direction Z, part of the second conductive part 43 is located between the first conductive part 42 and the top sealing part 22, and another part of the second conductive part 43 exceeds the first conductive part 42 along the second direction Y.

[0055] In some embodiments, one end of the first conductive portion 42 away from the circuit board 41 is connected to the second region 3112 of the first electrode terminal 31. The second conductive portion 43 includes a first connecting segment 431, a second connecting segment 432, and a first bending segment 433 connecting the first connecting segment 431 and the second connecting segment 432. The first connecting segment 431 is connected to the side 413 of the circuit board 41. The first connecting segment 431 and the second connecting segment 432 are arranged opposite to each other along the third direction Z. The first bending segment 433 extends along the third direction Z. A second penetration space 43A is formed between the first connecting segment 431, the second connecting segment 432, and the first bending segment 433. The second connecting segment 432 of the second conductive portion 43 is connected to the second segment 3212 of the second electrode terminal 32, thereby reducing the risk of mutual interference between the first conductive portion 42 and the second conductive portion 43. In some embodiments, the first connecting segment 431 is supported on the battery cell housing 20 of the second packaging area 222. In some embodiments, the second connecting segment 432 and the first bending segment 433 are located in the second space 32A. The first bending section 433 and the second segment 3212 of the second electrode terminal 32 may be in contact or separated, which is not limited here. In some embodiments, along the third direction Z, the orthographic projection of the second segment 3212 of the second electrode terminal 32 is located within the orthographic projection of the second connecting section 432 of the second conductive portion 43 .

[0056] In some embodiments, the second conductive part 43 is a flexible circuit board, and the second conductive part 43 and the circuit board 41 constitute a rigid-flexible board. The first conductive part 42 is a bus bar or a flexible circuit board.

[0057] In some embodiments, when the second conductive part 43 is a flexible circuit board, the circuit board assembly 40 further includes a conductive member 45, which is electrically connected to the second flexible circuit board and the first electrode terminal 31. In some embodiments, the conductive member 45 is disposed between the second conductive part 43 and the second electrode terminal 32. Specifically, the conductive member 45 is disposed between the second connecting segment 432 of the second conductive part 43 and the second segment 3212 of the second electrode terminal 32. In other embodiments, the conductive member 45 is disposed on the surface of the second conductive part 43 facing the second electrode terminal 32. Specifically, the conductive member 45 is disposed on the surface of the second connecting segment 432 of the second conductive part 43 facing the second segment 3212 of the second electrode terminal 32 in the third direction Z.

[0058] In some embodiments, the circuit board assembly 40 further includes a conductive connection portion 46, which is electrically connected to the circuit board 41 and is used to connect an external element (e.g., a power supply). In some embodiments, the conductive connection portion 46 is connected to the side 413 of the circuit board 41, and the conductive connection portion 46 and the first conductive portion 42 and the second conductive portion 43 are located on different sides of the circuit board 41. In some embodiments, the conductive connection portion 46, the circuit board 41, the first electrode terminal 31 and the second electrode terminal 32 are arranged in sequence along the second direction Y, and the conductive connection portion 46 extends beyond the circuit board 41 along the first direction X.

[0059] In some embodiments, see Figure 4 and Figure 5 , the first conductive part 42 is welded to the first surface 411, and the second conductive part 43 is connected to the side surface 413. The first conductive part 42 includes a first connecting part 421, a second connecting part 422, and a first bending part 423 connecting the first connecting part 421 and the second connecting part 422. The first connecting part 421 is welded to the first surface 411, the first connecting part 421 and the second connecting part 422 are arranged opposite to each other along the third direction Z, and the first bending part 423 extends along the third direction Z. A first penetration space 42A is formed between the first connecting part 421, the second connecting part 422, and the first bending part 423. Along the third direction Z, the second conductive part 43 is located on the side of the first conductive part 42 away from the top sealing part 22, and part of the second conductive part 43 is located in the first penetration space 42A. In some embodiments, the first connecting part 421 is supported on the battery cell housing 20 of the second packaging area 222. In some embodiments, the second connecting part 422 and the first bending part 423 are located in the first space 31A. The first bending portion 423 may be in contact with or separated from the first region 3111 of the first electrode terminal 31 , which is not limited here. In some embodiments, along the third direction Z, the orthographic projection of the second region 3112 of the first electrode terminal 31 is located within the orthographic projection of the second connecting portion 422 of the first conductive portion 42 .

[0060] In some embodiments, see Figure 6 , the first conductive part 42 is connected to the side surface 413, and the second conductive part 43 is welded to the second surface 412. Along the third direction Z, the second conductive part 43 is located on the side of the first conductive part 42 away from the top seal part 22, and part of the second conductive part 43 is located in the first penetration space 42A. In some embodiments, the first conductive part 42 is a flexible circuit board, and the first conductive part 42 and the circuit board 41 constitute a soft-hard combination board.

[0061] In some embodiments, see Figure 7 , the first conductive portion 42 is connected to the side surface 413, the second conductive portion 43 is welded to the first surface 411, along the third direction Z, part of the second conductive portion 43 is located between the first conductive portion 42 and the top seal portion 22, and another part of the second conductive portion 43 exceeds the first conductive portion 42 along the second direction Y. In some embodiments, the second conductive portion 43 is supported on the battery cell housing 20 of the second packaging area 222.

[0062] In some embodiments, see Figure 8 and Fig. 9 The first electrode terminal 31, the circuit board 41 and the second electrode terminal 32 are arranged in sequence along the second direction Y. There are two second packaging areas 222. Along the second direction Y, the first packaging area 221 is located between the two second packaging areas 222. The first electrode terminal 31 and the second electrode terminal 32 extend from the two second packaging areas 222 respectively, so that the accommodating space 20A and the notch 20B are located between the two electrode terminals, which facilitates the arrangement of the circuit board assembly 40.

[0063] In some embodiments, the circuit board 41 and the conductive connection parts 46 are arranged along the first direction X.

[0064] In some embodiments, the first conductive portion 42 and the second conductive portion 43 are respectively connected to the two side surfaces 413 of the circuit board 41. Along the second direction Y, the first conductive portion 42 and the second conductive portion 43 are located on opposite sides of the circuit board 41. In some embodiments, the first conductive portion 42 and the second conductive portion 43 are both flexible circuit boards, and the first conductive portion 42, the circuit board 41 and the second conductive portion 43 constitute a rigid-flexible board.

[0065] See also Fig.10In one embodiment of the present application, there is also provided an electric device 2, comprising any of the above electrochemical devices 1. The electric device 2 of the present application may be, but is not limited to, a laptop computer, a pen-input computer, a mobile computer, an electronic book player, a portable phone, a portable fax machine, a portable copier, a portable printer, a head-mounted stereo headset, a video recorder, an LCD TV, a portable cleaner, a portable CD player, a mini-disc, a transceiver, an electronic notepad, a calculator, a memory card, a portable recorder, a radio, a backup power supply, a motor, a car, a motorcycle, a power-assisted bicycle, a lighting fixture, a toy, a game console, a clock, an electric tool, a flashlight, a camera, a large household battery, and a lithium-ion capacitor, etc.

[0066] In addition, those skilled in the art should recognize that the above embodiments are only used to illustrate the present application, and are not intended to limit the present application. As long as they are within the spirit of the present application, appropriate changes and modifications to the above embodiments are within the scope of the present application.

Claims

1. An electrochemical device, characterized in that include: A battery cell, comprising a battery cell shell, an electrode assembly, a first electrode terminal and a second electrode terminal, wherein the battery cell shell comprises a main body and a top sealing portion extending from the main body along a first direction, wherein the electrode assembly is accommodated in the main body; the top sealing portion comprises a first packaging area and a second packaging area arranged along a second direction, wherein the first electrode terminal is connected to the electrode assembly and extends from the battery cell shell from the second packaging area, and the second electrode terminal is connected to the electrode assembly and extends from the battery cell shell from the second packaging area; the main body comprises a top wall, wherein the top wall comprises a first sub-wall, a second sub-wall and a first connecting wall connecting the first sub-wall and the second sub-wall, wherein along the first direction, the first sub-wall has a first distance from the electrode assembly, and the second sub-wall has a second distance from the electrode assembly, wherein the first distance is smaller than the second distance, and an accommodating space is formed between the first packaging area, the first sub-wall and the first connecting wall; A circuit board assembly, the circuit board assembly comprising a circuit board and a first conductive portion and a second conductive portion connected to the circuit board, wherein along a third direction, the circuit board overlaps with the first packaging area, and at least a portion of the circuit board is located in the accommodating space; The first conductive portion and the second conductive portion are independently arranged and respectively connected to the first electrode terminal and the second electrode terminal. Along the third direction, the first conductive portion overlaps with the second packaging area, and the second conductive portion overlaps with the second packaging area. The third direction is the thickness direction of the battery cell shell, and the first direction, the second direction and the third direction are perpendicular to each other.

2. The electrochemical device according to claim 1, characterized in that The first electrode terminal includes a first portion exposed outside the cell housing, the first portion overlaps with the second packaging area along the third direction, a first space is defined between the first portion and the second packaging area, and a portion of the first conductive portion is located in the first space; The second electrode terminal includes a second portion exposed from the cell shell, the second portion overlaps with the second packaging area along the third direction, a second space is defined between the second portion and the second packaging area, and part of the second conductive portion is located in the second space.

3. The electrochemical device according to claim 2, characterized in that The circuit board, the first electrode terminal and the second electrode terminal are arranged in sequence along the second direction.

4. The electrochemical device according to claim 3, characterized in that Along the third direction, the circuit board includes a first surface facing the top seal portion and a second surface facing away from the top seal portion, the first conductive portion is welded to the second surface, and along the third direction, part of the second conductive portion is located between the first conductive portion and the top seal portion.

5. The electrochemical device according to claim 3, characterized in that Along the third direction, the circuit board includes a first surface facing the top sealing part and a second surface facing away from the top sealing part, the first conductive part includes a first connecting part, a second connecting part and a first bending part connecting the first connecting part and the second connecting part, the first connecting part is welded to the first surface, the first connecting part and the second connecting part are arranged opposite to each other along the third direction, the first bending part extends along the third direction, a first penetration space is formed between the first connecting part, the second connecting part and the first bending part, and along the third direction, the second conductive part is located on the side of the first conductive part away from the top sealing part, and part of the second conductive part is located in the first penetration space.

6. The electrochemical device according to claim 4, characterized in that The second conductive part is a flexible circuit board, and the circuit board assembly further includes a conductive member, which is electrically connected to the flexible circuit board and the first electrode terminal.

7. The electrochemical device according to claim 3, characterized in that Along the third direction, the circuit board includes a first surface facing the top sealing part and a second surface facing away from the top sealing part, the first conductive part includes a first connecting part, a second connecting part and a first bending part connecting the first connecting part and the second connecting part, the first connecting part is connected to the circuit board, the first connecting part and the second connecting part are arranged opposite to each other along the third direction, the first bending part extends along the third direction, a first penetration space is formed between the first connecting part, the second connecting part and the first bending part, the second conductive part is welded to the second surface, and along the third direction, the second conductive part is located on the side of the first conductive part away from the top sealing part, and part of the second conductive part is located in the first penetration space.

8. The electrochemical device according to claim 3, characterized in that Along the third direction, the circuit board includes a first surface facing the top seal portion and a second surface facing away from the top seal portion, the second conductive portion is welded to the first surface, and along the third direction, part of the first conductive portion is located between the second conductive portion and the top seal portion.

9. The electrochemical device according to claim 1, wherein: The first electrode terminal, the circuit board and the second electrode terminal are arranged in sequence along the second direction.

10. The electrochemical device according to claim 9, characterized in that Along the first direction, the first packaging area includes a first edge away from the main body, the first edge has a third distance from the electrode assembly, the second packaging area includes a second edge away from the main body, the second edge has a fourth distance from the electrode assembly, and the third distance is smaller than the fourth distance; the top sealing portion includes a third edge connecting the first edge and the second edge, and a gap is formed between the first edge and the third edge; the circuit board assembly also includes components arranged on the circuit board, and at least some of the components are located in the gap.

11. The electrochemical device according to claim 10, characterized in that The third distance is D3, the fourth distance is D4, and 0.5 mm ≤ D4 - D3 ≤ 4 mm.

12. The electrochemical device according to claim 1, wherein The first distance is D1, the second distance is D2, and 0.5 mm ≤ D2 - D1 ≤ 3 mm.

13. The electrochemical device according to claim 1, wherein The circuit board is a rigid circuit board, and the first conductive part and the second conductive part are flexible conductive parts.

14. The electrochemical device according to claim 1, wherein The first conductive part is a bus bar or a flexible circuit board, and / or the second conductive part is a bus bar or a flexible circuit board.

15. An electrical equipment, characterized in that: Comprising the electrochemical device according to any one of claims 1 to 14.

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