Electrochemical device and electric apparatus

Abstract

The application discloses an electrochemical device and an electric equipment. The electrochemical device comprises an electric core and a circuit board assembly. The electric core comprises an electric core shell, an electrode assembly, a first electrode terminal and a second electrode terminal. The electric core shell comprises a main body part and a top sealing part, and the electrode assembly is accommodated in the main body part. The top sealing part comprises a first sealing area and a second sealing area. 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. A containing space is formed among the first sealing 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 containing 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 both overlap the second sealing area.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to an electrochemical device and an electrical appliance. Background Technology

[0002] Influenced by electronic products, batteries used for charging and discharging in electronic products are gradually developing towards thinner and more compact structures to be suitable for smaller and thinner electronic devices. Currently, because the battery head usually occupies a large space, it is difficult to increase the battery's energy density. Summary of the Invention

[0003] In view of this, this application provides an electrochemical device that is advantageous in reducing space occupation.

[0004] This application provides an electrochemical device, including a battery cell and a circuit board assembly. The battery cell includes a battery cell housing, an electrode assembly, a first electrode terminal, and a second electrode terminal. The battery cell housing includes a main body portion and a top sealing portion extending from the main body portion along a first direction, with the electrode assembly housed within the main body portion. The top sealing portion includes a first encapsulation region and a second encapsulation region arranged along a second direction. The first electrode terminal is connected to the electrode assembly and extends out of the battery cell housing from the second encapsulation region, and the second electrode terminal is connected to the electrode assembly and extends out of the battery cell housing from the second encapsulation region. The main body portion includes a top wall, which includes a first sub-wall, a second sub-wall, and a first connecting wall connecting the first sub-wall and the second sub-wall. 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, the first distance being less than the second distance. An accommodating space is formed between the first encapsulation region, the first sub-wall, and the first connecting wall. The circuit board assembly includes a circuit board and a first conductive portion and a second conductive portion connected to the circuit board. Along a third direction, the circuit board overlaps with the first encapsulation region, and at least a portion of the circuit board is located within the accommodating space. The first conductive portion and the second conductive portion are each independently disposed 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 encapsulation area, and the second conductive part overlaps with the second encapsulation area. The third direction is the thickness direction of the cell casing, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0005] In this application, two independently configured conductive parts are used to electrically connect the circuit board and two electrode terminals, which helps to reduce the width of the conductive parts and thus reduce the space occupied by the electrochemical device. Furthermore, the top wall of the battery cell includes a first sub-wall and a second sub-wall. The first distance between the first sub-wall and the electrode assembly is smaller than the second distance between the second sub-wall and the electrode assembly, creating an accommodating space between the first sub-wall, the first connecting wall, and the first encapsulation area. This reduces the volume of the battery cell head and further reduces the space occupied by the electrochemical device. Moreover, placing the circuit board within the accommodating space and ensuring that the first and second conductive parts overlap with the second encapsulation area reduces the impact of the width of the circuit board assembly on the overall width of the electrochemical device, thereby reducing the space occupied by the electrochemical device and increasing its energy density.

[0006] Based on the first aspect, in some embodiments, the first electrode terminal includes a first portion exposed outside the cell housing, which overlaps with a second encapsulation region along a third direction, with a first space between the first portion and the second encapsulation region, and a portion of the first conductive portion located in the first space; the second electrode terminal includes a second portion exposed outside the cell housing, which overlaps with a second encapsulation region along a third direction, with a second space between the second portion and the second encapsulation region, and a portion of the second conductive portion located in the second space. By respectively disposing the first conductive portion and the second conductive portion within the first space and the second space, the first conductive portion and the second conductive portion can share space with the first electrode terminal and the second electrode terminal without occupying additional space, 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 sequentially along a second direction.

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

[0009] Based on the first aspect, in some embodiments, along a third direction, the circuit board includes a first surface facing the top seal and a second surface facing away from the top seal. The first conductive portion includes a first connecting portion, a second connecting portion, and a first bent portion connecting the first connecting portion and the second connecting portion. The first connecting portion is soldered to the first surface. The first connecting portion and the second connecting portion are disposed opposite each other along a third direction. The first bent portion extends along a third direction, and a first through-space is formed between the first connecting portion, the second connecting portion, and the first bent portion. Along a third direction, the second conductive portion is located on the side of the first conductive portion away from the top seal, and a portion of the second conductive portion is located in the first through-space. This arrangement allows the second conductive portion to share space with the first conductive portion without occupying additional space, which is beneficial for reducing the space occupied by 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 element that is electrically connected to the flexible circuit board and the first electrode terminal.

[0011] Based on the first aspect, in some embodiments, along a third direction, the circuit board includes a first surface facing the top cover and a second surface facing away from the top cover. The first conductive portion includes a first connecting portion, a second connecting portion, and a first bent portion connecting the first connecting portion and the second connecting portion. The first connecting portion is connected to the circuit board. The first connecting portion and the second connecting portion are disposed opposite to each other along a third direction. The first bent portion extends along a third direction. A first through-space is formed between the first connecting portion, the second connecting portion, and the first bent portion. The second conductive portion is soldered to the second surface. Along a third direction, the second conductive portion is located on the side of the first conductive portion away from the top cover, and a portion of the second conductive portion is located in the first through-space.

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

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

[0014] Based on the first aspect, in some embodiments, along a first direction, a first encapsulation region includes a first edge facing away from the main body, the first edge having a third distance from the electrode assembly; a second encapsulation region includes a second edge facing away from the main body, the second edge having a fourth distance from the electrode assembly, the third distance being less than the fourth distance; a top seal includes a third edge connecting the first edge and the second edge, a notch being formed between the first edge and the third edge; the circuit board assembly also includes components disposed on the circuit board, at least some of which are located in the notch. By providing a notch at the edge of the battery cell housing and placing the components of the circuit board assembly within the notch, the impact of the component height on the overall thickness of the electrochemical device can be reduced, thereby reducing the space occupied by the electrochemical device.

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

[0017] Based on the first aspect, in some embodiments, the circuit board is a rigid circuit board, and the first conductive portion and the second conductive portion are flexible conductive portions. A rigid circuit board can provide support for components and other parts of the circuit board assembly. Making the conductive portions flexible facilitates processing, reduces the width of the conductive portions, and, based on the flexibility of the flexible conductive portions, allows for more flexible arrangement of the circuit board assembly and battery cells.

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

[0019] A second aspect of this application provides an electrical device, including any of the aforementioned electrochemical devices. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an electrochemical device provided in an embodiment of this application.

[0021] Figure 2 This is an exploded view of a battery cell provided in an embodiment of this application.

[0022] Figure 3 This is a partial exploded view of an electrochemical device provided in an embodiment of this application.

[0023] Figure 4 This is a schematic diagram of the structure of an electrochemical device provided in another embodiment of this application.

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

[0025] Figure 6 A partial structural schematic diagram of an electrochemical device provided in another embodiment of this application.

[0026] Figure 7 A partial structural schematic diagram of an electrochemical device provided in another embodiment of this application.

[0027] Figure 8 A partial structural schematic diagram of an electrochemical device provided in another embodiment of this application.

[0028] Figure 9 This is a partial exploded view of an electrochemical device provided in yet another embodiment of this application.

[0029] Figure 10This is a schematic diagram of the structure of an electrical device provided in an embodiment of this application. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0031] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or may also have an intervening component. When a component is considered to be "located" on another component, it can be directly located on the other component or may also have an intervening component.

[0032] It is worth noting that when there is an "electrical connection" between two components or parts, electrical conduction can be achieved through methods such as direct contact, welding, or adhesive bonding. The term "and / or" includes any and all combinations of one or more of the related listed items.

[0033] The term "perpendicular" is used to describe an ideal state between two components. In actual production or use, two components can exist in a state that is approximately perpendicular. For example, in numerical terms, perpendicularity can refer to the angle between two straight lines within the range of 90° ± 10°, the dihedral angle between two planes within the range of 90° ± 10°, or the angle between a straight line and a plane within the range of 90° ± 10°. The two components described as "perpendicular" do not have to be absolutely straight lines or planes; they can be approximately straight lines or planes. From a macroscopic perspective, if the overall direction of extension is straight or plane, the component can be considered a "straight line" or "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 A is greater than B by 10, it should be understood that it includes the case where A is greater than B by 9, as well as the case where A is greater than B by 11.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0036] Some embodiments of this application will now be described with reference to the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0037] Please see Figure 1 and Figure 2One embodiment of this application provides an electrochemical device 1, which includes a battery cell 100. The battery cell 100 includes an electrode assembly 10, a battery cell housing 20, and electrode terminals. The electrode assembly 10 is disposed within the battery cell housing 20, and the electrode terminals are connected to the electrode assembly 10 and extend from the battery cell housing 20 for electrical connection to external components (e.g., a circuit board). The electrode terminals include a first electrode terminal 31 and a second electrode terminal 32 with opposite polarities. 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 housing 20.

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

[0039] Please see Figure 1 and Figure 3 The battery cell housing 20 includes a main body portion 21 and an encapsulation portion. The main body portion 21 has a receiving cavity for accommodating the electrode assembly 10 and the electrode terminals. The encapsulation portion extends from the main body portion 21 along at least one side away from the main body portion 21 and is used to seal the receiving cavity. The encapsulation portion is the part of the battery cell housing 20 that is sealed by processes such as hot pressing or bonding after the electrode assembly 10 is housed. Optionally, the battery cell housing 20 can use a flexible encapsulation film (e.g., aluminum-plastic film, steel-plastic film) or a rigid plastic housing.

[0040] The encapsulation portion includes a top seal portion 22 extending from the main body portion 21 along a first direction X. The top seal portion 22 includes a first encapsulation region 221 and a second encapsulation region 222 arranged along a second direction Y. The second direction Y is perpendicular to the first direction X. A first electrode terminal 31 and a second electrode terminal 32 both extend from the second encapsulation region 222 out of the cell housing 20. The first encapsulation region 221 is the area in the top seal portion 22 where no electrode terminal extends. In some embodiments, the first encapsulation region 221 and the second encapsulation region 222 are arranged sequentially along the second direction Y. In some embodiments, the encapsulation portion further includes a side seal portion 23 extending from the main body portion 21 along the second direction Y and connected to the top seal portion 22. The side seal portion 23 may be located on opposite sides of the main body portion 21 in the second direction Y.

[0041] The main body 21 includes a top wall 211, and a top sealing portion 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 a first encapsulation region 221, and the second sub-wall 2112 is connected to a second encapsulation region 222. Along a first direction X, the first sub-wall 2111 has a first distance D1 from the electrode assembly 10, and the second sub-wall 2112 has a second distance D2 from the electrode assembly 10. The first distance D1 is smaller than the second distance D2, such that a receiving space is formed between the second sub-wall 2112 and the electrode assembly 10. This receiving space is used to receive internal components, such as portions for connecting electrode terminals and the electrode assembly 10 and soldering them to the electrode terminals. The first sub-wall 2111 may be separate 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, which also forms an accommodating space 20A between the first sub-wall 2111, the first connecting wall 2113, and the first encapsulation area 221. This accommodating space 20A is used to accommodate external components, such as a portion accommodating a circuit board. By setting the accommodating space 20A, the space occupied by 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 a range of 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm or any two of these values, 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 cell 100, so that the accommodating space 20A is large enough to accommodate external components and the electrochemical device 1 has a high energy density.

[0043] Please see Figure 1 and Figure 3The electrochemical device 1 also 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 terminals. The circuit board assembly 40 includes a circuit board 41, a first conductive portion 42, and a second conductive portion 43. Both the first conductive portion 42 and the second conductive portion 43 are connected to the circuit board 41. The first conductive portion 42 and the second conductive portion 43 are each independently disposed. 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 to the case 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 this application, the first electrode terminal 31 and the second electrode terminal 32 are each connected to the circuit board 41 through two independently disposed conductive portions. The width of a single conductive portion in the first direction X can be reduced, thus reducing the impact of the width of the conductive portion in the first direction X on the overall width of the electrochemical device 1, and consequently, reducing the space occupied by the electrochemical device 1 in the first direction X.

[0044] Along the third direction Z, the circuit board 41 overlaps with the first packaging region 221, and at least a portion of the circuit board 41 is located in the accommodating space 20A. The third direction Z is the thickness direction of the 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 cell housing 20 of the first packaging region 221. Placing the circuit board 41 in the accommodating space 20A can reduce the impact 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 space occupied by the electrochemical device 1.

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

[0046] In some embodiments, circuit board 41 is a rigid circuit board. A rigid circuit board refers to a rigid board made of materials such as fiberglass copper-clad laminate, which cannot be bent or flexed, has a certain mechanical strength, and can play a supporting role.

[0047] In some embodiments, the first conductive portion 42 and the second conductive portion 43 are flexible conductive portions. The flexible conductive portions are made of flexible materials and can be bent and flexed. Making the conductive portions flexible facilitates processing, reduces the width of the conductive portions, and, based on the flexibility of the flexible conductive portions, allows for more flexible arrangement of the circuit board assembly 40 and the battery cell 100.

[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 constructed by printing or attaching functional components such as wires and thin lines onto a flexible substrate, which can be a flexible polyimide film, polyester film, etc. Flexible circuit boards have characteristics such as being bendable, foldable, and rollable. When the conductive part is a flexible circuit board, the flexible circuit board and circuit board 41 can be bonded together to form a rigid-flex board, or the flexible circuit board can be soldered to circuit board 41. A bus refers to a carrier that connects multiple electrode terminals to deliver the total current of the battery cell 100 or to charge the battery cell 100. The bus can be a metal plate or a metal wire; the metal plate can be an aluminum plate or a copper plate, etc. When the conductive part is a bus, the bus is soldered to circuit board 41.

[0049] The first electrode terminal 31 includes a first portion 311 exposed outside the cell housing 20. In some embodiments, along a third direction Z, the first portion 311 overlaps with the second encapsulation region 222, and a first space 31A exists between the first portion 311 and the second encapsulation region 222. Specifically, the first portion 311 includes an adjoining first region 3111 and a second region 3112. The first region 3111 extends along a 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 encapsulation region 222. The first region 3111, the second region 3112, and the second encapsulation region 222 form the first space 31A. A portion of the first conductive portion 42 is located in the first space 31A. By placing the first conductive portion 42 in the first space 31A, the entire first conductive portion 42 can share space with the second encapsulation region 222 and the first electrode terminal 31 without occupying additional space, further improving the energy density of the electrochemical device 1.

[0050] The second electrode terminal 32 includes a second portion 321 exposed outside the cell housing 20. In some embodiments, along a third direction Z, the second portion 321 overlaps with the second encapsulation region 222, and a second space 32A exists between the second portion 321 and the second encapsulation region 222. Specifically, the second portion 321 includes a first segment 3211 and a second segment 3212 that are in contact. The first segment 3211 extends along a 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 encapsulation region 222. The first segment 3211, the second segment 3212, and the second encapsulation region 222 form the second space 32A. A portion of the second conductive portion 43 is located in the second space 32A. By placing the second conductive portion 43 in the second space 32A, the entire second conductive portion 43 can share space with the second encapsulation region 222 and the second electrode terminal 32 without occupying additional space, further improving the energy density of the electrochemical device 1.

[0051] Along the first direction X, the first encapsulation region 221 includes a first edge 221A facing away from the main body 21, the first edge 221A having a third distance D3 with the electrode assembly 10, and the second encapsulation region 222 includes a second edge 222A facing away from the main body 21, the second edge 222A having a fourth distance D4 with the electrode assembly 10. In some embodiments, the third distance D3 is less than the fourth distance D4, and the top seal 22 includes a third edge 22A connecting the first edge 221A and the second edge 222A, with a notch 20B formed between the first edge 221A and the third edge 22A. The circuit board assembly 40 also includes components 44 disposed on the circuit board 41, at least some of which are located in the notch 20B, reducing the impact of the height of the components 44 in the third direction Z on the overall thickness of the electrochemical device 1, thereby helping to reduce the space occupied by the electrochemical device 1.

[0052] In some embodiments, 0.5mm≤D4-D3≤4mm, for example, D4-D3 is a range of 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm or any two of these values, to balance 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 high energy density.

[0053] In some embodiments, the circuit board 41, the first electrode terminal 31, and the second electrode terminal 32 are arranged sequentially 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 respectively connected to the first electrode terminal 31 and the second electrode terminal 32.

[0054] Along the third direction Z, the circuit board 41 includes a first surface 411 facing the top seal 22, a second surface 412 facing away from the top seal 22, and a side surface 413 connecting the first surface 411 and the second surface 412. (See also...) Figure 1 and Figure 3 The first conductive part 42 is welded to the second surface 412, and the second conductive part 43 is connected to the side surface 413. 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 extends beyond the first conductive part 42 along the second direction Y.

[0055] In some embodiments, the 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 bent 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 disposed opposite each other in a third direction Z. The first bent segment 433 extends in a third direction Z. A second penetration space 43A is formed between the first connecting segment 431, the second connecting segment 432, and the first bent 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 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 cell housing 20 of the second packaging region 222. In some embodiments, the second connecting segment 432 and the first bent segment 433 are located in the second space 32A. The first bent segment 433 and the second segment 3212 of the second electrode terminal 32 can 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 segment 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-flex board. The first conductive part 42 is a bus or a flexible circuit board.

[0057] In some embodiments, when the second conductive portion 43 is a flexible circuit board, the circuit board assembly 40 further includes a conductive element 45, which is electrically connected to the second flexible circuit board and the first electrode terminal 31. In some embodiments, the conductive element 45 is disposed between the second conductive portion 43 and the second electrode terminal 32. Specifically, the conductive element 45 is disposed between the second connecting segment 432 of the second conductive portion 43 and the second segment 3212 of the second electrode terminal 32. In other embodiments, the conductive element 45 is disposed on the surface of the second conductive portion 43 facing the second electrode terminal 32. Specifically, the conductive element 45 is disposed on the surface of the second connecting segment 432 of the second conductive portion 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 electrically connected to the circuit board 41 and used for connecting external components (e.g., a power supply). In some embodiments, the conductive connection portion 46 is connected to a side surface 413 of the circuit board 41, and the conductive connection portion 46 is located on a different side of the circuit board 41 from the first conductive portion 42 and the second conductive portion 43. 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 sequentially along a second direction Y, and the conductive connection portion 46 extends beyond the circuit board 41 along a first direction X.

[0059] In some embodiments, please refer to Figure 4 and Figure 5 A first conductive portion 42 is welded to a first surface 411, and a second conductive portion 43 is connected to a side surface 413. The first conductive portion 42 includes a first connecting portion 421, a second connecting portion 422, and a first bent portion 423 connecting the first connecting portion 421 and the second connecting portion 422. The first connecting portion 421 is welded to the first surface 411, and the first connecting portion 421 and the second connecting portion 422 are disposed opposite each other along a third direction Z. The first bent portion 423 extends along a third direction Z. A first through-space 42A is formed between the first connecting portion 421, the second connecting portion 422, and the first bent portion 423. Along the third direction Z, the second conductive portion 43 is located on the side of the first conductive portion 42 away from the top seal portion 22, and a portion of the second conductive portion 43 is located in the first through-space 42A. In some embodiments, the first connecting portion 421 is supported on the cell housing 20 of the second encapsulation region 222. In some embodiments, the second connecting portion 422 and the first bent portion 423 are located in the first space 31A. The first bend 423 may contact or separate 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 connection portion 422 of the first conductive portion 42.

[0060] In some embodiments, please refer to Figure 6 The first conductive portion 42 is connected to the side surface 413, and the second conductive portion 43 is soldered to the second surface 412. Along the third direction Z, the second conductive portion 43 is located on the side of the first conductive portion 42 away from the top seal portion 22, and a portion of the second conductive portion 43 is located in the first through-space 42A. In some embodiments, the first conductive portion 42 is a flexible circuit board, and the first conductive portion 42 and the circuit board 41 constitute a rigid-flex board.

[0061] In some embodiments, please refer to Figure 7 The first conductive portion 42 is connected to the side surface 413, and the second conductive portion 43 is welded to the first surface 411. Along the third direction Z, a portion of the second conductive portion 43 is located between the first conductive portion 42 and the top seal portion 22, and another portion of the second conductive portion 43 extends beyond the first conductive portion 42 along the second direction Y. In some embodiments, the second conductive portion 43 is supported on the cell housing 20 of the second packaging region 222.

[0062] In some embodiments, please refer to Figure 8 and Figure 9 The first electrode terminal 31, the circuit board 41, and the second electrode terminal 32 are arranged sequentially 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 setting of the circuit board assembly 40.

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

[0064] In some embodiments, the first conductive portion 42 and the second conductive portion 43 are respectively connected to two sides 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-flex board.

[0065] Please see Figure 10One embodiment of this application also provides an electrical device 2, including any of the electrochemical devices 1 described above. The electrical device 2 of this application may be, but is not limited to, laptops, pen-based computers, mobile computers, e-book players, portable telephones, portable fax machines, portable copiers, portable printers, stereo headphones, video recorders, LCD TVs, portable cleaners, portable CD players, mini CDs, transceivers, electronic notebooks, calculators, memory cards, portable recorders, radios, backup power supplies, motors, automobiles, motorcycles, electric bicycles, lighting fixtures, toys, game consoles, clocks, power tools, flashlights, cameras, large household batteries, and lithium-ion capacitors, etc.

[0066] Furthermore, those skilled in the art should recognize that the above embodiments are merely illustrative of this application and are not intended to limit this application. Any appropriate changes and modifications made to the above embodiments within the essential spirit and scope of this application fall within the scope of this application's disclosure.

Claims

1. An electrochemical device, characterized in that, include: A battery cell includes a cell housing, an electrode assembly, a first electrode terminal, and a second electrode terminal. The cell housing includes a main body and a top sealing portion extending from the main body along a first direction. The electrode assembly is housed within the main body. The top sealing portion includes a first encapsulation area and a second encapsulation area arranged along a second direction. The first electrode terminal is connected to the electrode assembly and extends out of the cell housing from the second encapsulation area. The second electrode terminal is connected to the electrode assembly and extends out of the cell housing from the second encapsulation area. The main body includes a top wall, which includes a first sub-wall, a second sub-wall, and a first connecting wall connecting the first sub-wall and the second sub-wall. 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. The first distance is less than the second distance. An accommodating space is formed between the first encapsulation area, the first sub-wall, and the first connecting wall. A circuit board assembly, the circuit board assembly including a circuit board and a first conductive portion and a second conductive portion connected to the circuit board, wherein the circuit board overlaps with the first packaging region along a third direction, and at least a portion of the circuit board is located in the accommodating space; The first conductive part and the second conductive part are each independently provided 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 cell shell. The first direction, the second direction and the third direction are perpendicular to each other. The first electrode terminal includes a first portion exposed outside the cell housing. Along the third direction, the first portion overlaps with the second encapsulation area, and there is a first space between the first portion and the second encapsulation area. A portion of the first conductive portion is located in the first space. The second electrode terminal includes a second portion exposed outside the cell housing. Along the third direction, the second portion overlaps with the second packaging area, and a second space exists between the second portion and the second packaging area. A portion of the second conductive portion is located in the second space.

2. The electrochemical device as described in claim 1, characterized in that, The circuit board, the first electrode terminal, and the second electrode terminal are arranged sequentially along the second direction.

3. The electrochemical device as described in claim 2, characterized in that, Along the third direction, the circuit board includes a first surface facing the top seal and a second surface facing away from the top seal, the first conductive portion is soldered to the second surface, and along the third direction, a portion of the second conductive portion is located between the first conductive portion and the top seal.

4. The electrochemical device as described in claim 2, characterized in that, Along the third direction, the circuit board includes a first surface facing the top seal and a second surface facing away from the top seal. The first conductive portion includes a first connecting portion, a second connecting portion, and a first bent portion connecting the first connecting portion and the second connecting portion. The first connecting portion is soldered to the first surface. The first connecting portion and the second connecting portion are disposed opposite to each other along the third direction. The first bent portion extends along the third direction. A first through-space is formed between the first connecting portion, the second connecting portion, and the first bent portion. Along the third direction, the second conductive portion is located on the side of the first conductive portion away from the top seal, and a portion of the second conductive portion is located in the first through-space.

5. The electrochemical device as described in claim 3, characterized in that, The second conductive part is a flexible circuit board, and the circuit board assembly further includes a conductive element, which is electrically connected to the flexible circuit board and the first electrode terminal.

6. The electrochemical device as described in claim 2, characterized in that, Along the third direction, the circuit board includes a first surface facing the top seal and a second surface facing away from the top seal. The first conductive portion includes a first connecting portion, a second connecting portion, and a first bent portion connecting the first connecting portion and the second connecting portion. The first connecting portion is connected to the circuit board. The first connecting portion and the second connecting portion are disposed opposite to each other along the third direction. The first bent portion extends along the third direction. A first through-space is formed between the first connecting portion, the second connecting portion, and the first bent portion. The second conductive portion is soldered to the second surface. Along the third direction, the second conductive portion is located on the side of the first conductive portion away from the top seal, and a portion of the second conductive portion is located in the first through-space.

7. The electrochemical device as described in claim 2, characterized in that, Along the third direction, the circuit board includes a first surface facing the top seal and a second surface facing away from the top seal, the second conductive portion is soldered to the first surface, and along the third direction, a portion of the first conductive portion is located between the second conductive portion and the top seal.

8. The electrochemical device as claimed in claim 1, characterized in that, The first electrode terminal, the circuit board, and the second electrode terminal are arranged sequentially along the second direction.

9. The electrochemical device as described in claim 8, characterized in that, Along the first direction, the first encapsulation region includes a first edge away from the main body portion, the first edge having a third distance from the electrode assembly; the second encapsulation region includes a second edge away from the main body portion, the second edge having a fourth distance from the electrode assembly, the third distance being less than the fourth distance; the top seal includes a third edge connecting the first edge and the second edge, a notch being formed between the first edge and the third edge; the circuit board assembly further includes components disposed on the circuit board, at least some of the components being located in the notch.

10. The electrochemical device as claimed in claim 9, characterized in that, The third distance is D3, the fourth distance is D4, and 0.5mm≤D4-D3≤4mm.

11. The electrochemical device as claimed in claim 1, characterized in that, The first distance is D1, the second distance is D2, and 0.5mm ≤ D2 - D1 ≤ 3mm.

12. The electrochemical device as claimed in claim 1, characterized in that, The circuit board is a rigid circuit board, and the first conductive part and the second conductive part are flexible conductive parts.

13. The electrochemical device as claimed in claim 1, characterized in that, The first conductive part is a bus or a flexible circuit board, and / or the second conductive part is a bus or a flexible circuit board.

14. An electrical appliance, characterized in that, Includes the electrochemical device as described in any one of claims 1 to 13.

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