Electrochemical device and electric apparatus

Abstract

This application discloses an electrochemical device and an electrical appliance. The electrochemical device includes a battery cell, a protective circuit board, a conductive component, and an insulating component. The battery cell includes a battery cell housing and electrode terminals partially disposed within the battery cell housing, with the electrode terminals extending out of the battery cell housing. The protective circuit board is located on one side of the battery cell housing along a second direction. The protective circuit board includes a first circuit board, a second circuit board, a connector, and components. The first circuit board includes a first surface, and the second circuit board and components are all connected to the first surface. The connector is disposed on the second circuit board. Along the second direction, the electrode terminals overlap with the second circuit board and / or the components. The second direction is perpendicular to the first direction, which is the thickness direction of the battery cell housing. The conductive component is electrically connected to the first circuit board and the electrode terminals. The insulating component is located between at least one of the second circuit board and the components and the electrode terminals.

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 fit smaller and thinner electronic devices. The more compact the battery, the greater the space required for the battery's protection circuit board. Currently, this is usually achieved by increasing the length of the protection circuit board. However, this approach increases the overall space occupied by the battery, affecting its energy density. Utility Model Content

[0003] In view of this, this application provides an electrochemical device that is advantageous for improving energy density.

[0004] This application provides an electrochemical device, including a battery cell, a protective circuit board, a conductive element, and an insulating element. The battery cell includes a battery cell housing and electrode terminals partially disposed within the battery cell housing, with the electrode terminals extending out of the battery cell housing. The protective circuit board is located on one side of the battery cell housing along a second direction. The protective circuit board includes a first circuit board, a second circuit board, a connector, and components. The first circuit board includes a first surface, and the second circuit board and components are all connected to the first surface. The connector is disposed on the second circuit board. Along the second direction, the electrode terminals overlap with the second circuit board and / or the components. The second direction is perpendicular to the first direction, which is the thickness direction of the battery cell housing. The conductive element is electrically connected to the first circuit board and the electrode terminals. The insulating element is located between at least one of the second circuit board and the components and the electrode terminals.

[0005] This application, by setting the electrode terminals to overlap with the second circuit board and / or components in the second direction, allows the electrode terminals and the second circuit board and / or components to share space in the direction perpendicular to the second direction. This is beneficial for reducing the space occupied by the electrochemical device and increasing the energy density of the electrochemical device. Furthermore, the fact that the electrode terminals and the second circuit board and / or components can share space in the direction perpendicular to the second direction also helps to increase the layout space on the first circuit board, thereby helping to reduce the size of the first circuit board and thus helping to increase the energy density of the electrochemical device.

[0006] Based on the first aspect, in some embodiments, the electrode terminal includes a first bent portion and an extension portion. The extension portion extends along a first direction, and the first bent portion extends from the edge of the cell housing and connects to the extension portion. The conductive element includes a first conductive portion, a second conductive portion, and a second bent portion connecting the first conductive portion and the second conductive portion. The first conductive portion and the second conductive portion are disposed opposite to each other along a second direction. The first conductive portion is connected to a first surface, and the second conductive portion is connected to the extension portion. Along a third direction, the width of the second conductive portion is greater than the width of the first conductive portion. Along the second direction, the second conductive portion overlaps with a second circuit board and / or components. The third direction, the second direction, and the first direction are perpendicular to each other. By setting the width of the first conductive portion to be smaller than the width of the second conductive portion and making the second conductive portion overlap with the second circuit board and / or components, the layout space of the first circuit board is increased. While keeping the number of components unchanged, the size of the first circuit board can be reduced, which is beneficial to improving the energy density of the electrochemical device.

[0007] Based on the first aspect, in some embodiments, the distance between the second bent portion and the second circuit board along the first direction is D1, and the distance between the first conductive portion and the second circuit board along the third direction is D2, where 0.8mm ≤ D1 ≤ 2.0mm and 0.8mm ≤ D2 ≤ 2.0mm. When D1 and D2 are within the above ranges, the spacing between the conductive component and the second circuit board is appropriate, reducing the risk of interference between the conductive component and the second circuit board.

[0008] Based on the first aspect, in some embodiments, when viewed along the second direction, the edge of the second circuit board has a notch, and a portion of the second conductive part is located in the notch. Placing a portion of the second conductive part within the notch helps to reduce the distance between the second circuit board and the first conductive part, thereby reducing the space occupied by the electrochemical device.

[0009] Based on the first aspect, in some embodiments, when the second conductive part is not folded toward the first conductive part, the second conductive part and the first conductive part are coplanar; along the first direction, the distance between the second conductive part and the second circuit board is D1, and along the third direction, the distance between the first conductive part and the second circuit board is D2, 0.8mm≤D1≤2.0mm, 0.8mm≤D2≤2.0mm.

[0010] Based on the first aspect, in some embodiments, along the second direction, the extension is located between the first conductive part and the second conductive part, such that the extension and the conductive part share space in the second direction, which is beneficial to reduce the space occupied by the electrochemical device.

[0011] Based on the first aspect, in some embodiments, the width of the first conductive portion along a third direction is 4mm–6mm. When the width of the first conductive portion is within the above range, while ensuring sufficient connection strength between the first conductive portion and the first circuit board, the first conductive portion occupies less layout space on the first circuit board, which is beneficial for reducing the size of the first circuit board.

[0012] Based on the first aspect, in some embodiments, along the second direction, the conductive element is located between the electrode terminal and the first circuit board, with one side of the conductive element connected to the first circuit board and the other side of the conductive element connected to the electrode terminal.

[0013] Based on the first aspect, in some embodiments, the thickness of the conductive element is greater than the thickness of the component and / or the thickness of the second circuit board, in order to avoid interference between the electrode terminals and the component and / or the second circuit board.

[0014] Based on the first aspect, in some embodiments, the first circuit board is a rigid printed circuit board and the second circuit board is a flexible printed circuit board.

[0015] A second aspect of this application provides an electrical device, including any of the aforementioned electrochemical devices. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an electrochemical device provided in an embodiment of this application.

[0017] Figure 2 for Figure 1 A schematic diagram of the electrochemical device shown.

[0018] Figure 3 This is a schematic diagram of the battery cell before packaging, provided in an embodiment of this application.

[0019] Figure 4 for Figure 1 The electrochemical device shown is a partial cross-sectional view along IV-IV.

[0020] Figure 5 for Figure 1 The electrochemical device shown is a partial cross-sectional view along VV.

[0021] Figure 6 A partial cross-sectional view of an electrochemical device provided for another embodiment of this application.

[0022] Figure 7 A partial cross-sectional view of an electrochemical device provided in yet another embodiment of this application.

[0023] Figure 8 This is a schematic diagram of the structure of the protective circuit board and conductive components after assembly, according to an embodiment of this application.

[0024] Figure 9 This is a schematic diagram of the structure of a protective circuit board and an folded conductive component assembled according to an embodiment of this application.

[0025] Figure 10 This is a schematic diagram of the structure of a protective circuit board provided in another embodiment of this application.

[0026] Figure 11 This is a schematic diagram of the protection circuit board and electrode terminals assembled according to an embodiment of this application.

[0027] Figure 12 This is a schematic diagram of the structure of an electrical device provided in an embodiment of this application. Detailed Implementation

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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".

[0032] 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.

[0033] 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.

[0034] 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.

[0035] Please see Figure 1 , Figure 2 and Figure 3 This application provides an electrochemical device 1, which includes a battery cell 100, a protective circuit board 40, and a conductive element 50. The battery cell 100 includes an electrode assembly 10, a battery cell housing 20, and electrode terminals 30. The electrode assembly 10 is disposed within the battery cell housing 20, and the electrode terminals 30 are connected to the electrode assembly 10 and extend from the battery cell housing 20, and are electrically connected to the protective circuit board 40 via the conductive element 50. The number of electrode terminals 30 is two, designated as a positive terminal and a negative terminal. In another embodiment, the number of electrode terminals 30 may be greater than two; this application does not impose a limitation.

[0036] The electrode assembly 10 is used to store chemical energy. The electrode assembly 10 is connected to a circuit via electrode terminals 30, and converts chemical energy into electrical energy through an internal chemical reaction. The electrode assembly 10 includes a positive electrode, a negative electrode, and a separator disposed between the positive and negative electrode. Optionally, the positive electrode, separator, and negative electrode are sequentially stacked and wound to form a wound structure; alternatively, the positive electrode, separator, and negative electrode are sequentially stacked to form a laminated structure.

[0037] In some embodiments, the cell housing 20 includes a main body 21 and an encapsulation portion 22. The main body 21 has a receiving cavity 210 for receiving the electrode assembly 10 and the electrode terminals 30. The encapsulation portion 22 extends from the main body 21 along at least one side away from the main body 21 and is used to seal the periphery of the receiving cavity 210. The encapsulation portion 22 is the portion of the cell housing 20 that is sealed by processes such as hot pressing or bonding after the electrode assembly 10 has been received. Optionally, the cell housing 20 may be made of a flexible encapsulation film (e.g., aluminum-plastic film, steel-plastic film) or a rigid plastic housing. In another embodiment, the cell housing 20 is a metal housing.

[0038] Please see Figure 1 , Figure 2 and Figure 4The protection circuit board 40 is located on one side of the cell housing 20 along the second direction Y. The second direction Y is perpendicular to the first direction X, which is the thickness direction of the cell housing 20. The protection circuit board 40 includes a first circuit board 41, a second circuit board 42, components 43, and a connector 44. The second circuit board 42 and components 43 are located on the same side of the first circuit board 41. The connector 44 is located on the second circuit board 42 and is used to connect the first circuit board 41 to an external power source or device. Specifically, the first circuit board 41 includes a first surface 411 and a second surface 412 disposed opposite each other along the second direction Y. The second circuit board 42, components 43, and conductive elements 50 are all connected to the first surface 411, and the connector 44 is connected to the surface of the second circuit board 42 facing away from the first circuit board 41.

[0039] In some embodiments, the first circuit board 41 is a rigid printed circuit board. A rigid circuit board refers to a rigid board made of a substrate such as a glass fiber copper-clad laminate, which cannot be bent or flexed, has a certain mechanical strength, and can play a supporting role to support components 43, etc.

[0040] In some embodiments, the second circuit board 42 is a flexible circuit board. A flexible circuit board is a circuit board constructed by printing or attaching functional components such as wires and fine lines onto a flexible substrate, such as a flexible polyimide film or polyester film. Flexible circuit boards are thinner, and using a flexible circuit board 42 helps reduce the space occupied by the protective circuit board 40 in the second direction. The second circuit board 42 can also be a rigid printed circuit board.

[0041] In some embodiments, component 43 may include resistors, capacitors, inductors, diodes, transistors, sensors, integrated circuits, etc.

[0042] Please see Figure 2 , Figure 4 and Figure 5 Along the second direction Y, the electrode terminal 30 overlaps with the second circuit board 42. The electrochemical device 1 includes an insulating member 60 located between the electrode terminal 30 and the second circuit board 42 to insulate the electrode terminal 30 from the second circuit board 42. The insulating member 60 may be connected to the second circuit board 42 and / or the electrode terminal 30; this application is not limited to this. The insulating member 60 may be aramid paper, etc. In some embodiments, the thickness of the insulating member 60 is 0.07 mm to 0.1 mm. When the thickness of the insulating member 60 is within the above range, the thickness of the insulating member 60 has a relatively small impact on the energy density of the electrochemical device 1, while ensuring good insulation performance.

[0043] In some embodiments, referring to 6, along the second direction Y, the electrode terminal 30 overlaps with the component 43, and the insulating member 60 is located between the electrode terminal 30 and the component 43. The insulating member 60 may be connected to the electrode terminal 30 and / or the component 43.

[0044] In some embodiments, please refer to Figure 7 Along the second direction Y, electrode terminal 30 overlaps with second circuit board 42 and component 43, and insulating member 60 is located between electrode terminal 30 and second circuit board 42 and component 43. Insulating member 60 can be connected to at least one of electrode terminal 30, second circuit board 42 and component 43.

[0045] By arranging the electrode terminal 30 to overlap with the second circuit board 42 and / or components 43 in the second direction Y, the electrode terminal 30 and the second circuit board 42 and / or components 43 can share space in the first direction X and / or the third direction Z, which is perpendicular to the second direction Y. This helps to reduce the space occupied by the electrochemical device 1 in the first direction X and / or the third direction Z, thereby increasing the energy density of the electrochemical device 1. Furthermore, by providing an insulating member 60 between the electrode terminal 30 and the second circuit board 42 and / or components 43, the distance between the electrode terminal 30 and the second circuit board 42 and / or components 43 in the second direction Y can be reduced, which helps to reduce the space occupied by the electrochemical device 1 in the second direction Y, thereby increasing the energy density of the electrochemical device 1. Additionally, while keeping the widths of the electrode terminal 30 and the first circuit board 41 constant in the third direction Z, arranging the electrode terminal 30 to overlap with the second circuit board 42 and / or components 43 in the second direction Y allows for the arrangement of more components 43 on the first circuit board 41, which helps to reduce the area of ​​the first circuit board 41 and increase the energy density of the electrochemical device 1.

[0046] In some embodiments, electrode terminals 30 are connected to electrode assembly 10 and extend out of cell housing 20 in the second direction Y. See also Figure 2 and Figure 4 The electrode terminal 30 includes a first bent portion 31 and an extension portion 32 located outside the cell housing 20 and connected to each other. The extension portion 32 extends along a first direction X. The first bent portion 31 extends from the edge of the cell housing 20 and connects to the extension portion 32. The first bent portion 31 and the extension portion 32 can be formed by bending a portion of the electrode terminal 30 extending out of the cell housing 20 along a second direction Y towards the first direction X. By providing the first bent portion 31, the space occupied by the electrode terminal 30 in the second direction Y can be reduced, thereby increasing the energy density of the electrochemical device 1.

[0047] In some embodiments, please refer to Figure 4 and Figure 8The first circuit board 41 and the extension 32 of the electrode terminal 30 are located on the same side of the conductive element 50. Specifically, the conductive element 50 includes a third surface 501 and a fourth surface 502 facing each other, and the first circuit board 41 and the extension 32 are both connected to the third surface 501. The conductive element 50 includes a first conductive part 51, a second conductive part 52, and a second bent part 53. The third surface 501 located on the first conductive part 51 is connected to the first surface 411 of the first circuit board 41. The first conductive part 51 and the second conductive part 52 are arranged opposite each other along the second direction Y. The fourth surface 502 located on the first conductive part 51 and a portion of the fourth surface 502 located on the second conductive part 52 are spaced apart by a certain distance in the second direction Y, and the fourth surface 502 located on the second conductive part 52 is connected to the extension 32. By arranging the second conductive part 52 and the first conductive part 51 opposite each other along the second direction Y, the space occupied by the connected first circuit board 41, electrode terminal 30, and conductive element 50 in the second direction Y can be reduced, which is beneficial to improving the energy density of the electrochemical device 1.

[0048] In some embodiments, please refer to Figure 2 and Figure 5 There are two second circuit boards 42 and two conductive elements 50. Along the third direction Z, component 43 is located between the two second circuit boards 42. Along the third direction Z, the width of the second conductive portion 52 is greater than the width of the first conductive portion 51. Specifically, in the third direction Z, along the direction from which one conductive element 50 is away from the other, the edge of the second conductive portion 52 extends beyond the edge of the first conductive portion 51, so that the width of the second conductive portion 52 is greater than the width of the first conductive portion 51. Viewed along the second direction Y, the first conductive portion 51 is located between adjacent components 43 and second circuit boards 42. Along the second direction Y, the second conductive portion 52 overlaps with the second circuit board 42, and the insulating element 60 is located between the second conductive portion 52 and the second circuit board 42. The width of the second conductive portion 52 can be approximately equal to the width of the extension 32 to facilitate soldering of the second conductive portion 52 to the extension 32.

[0049] In another embodiment, please refer to Figure 6 In the third direction Z, along the direction from one conductive element 50 to another, the edge of the second conductive portion 52 extends beyond the edge of the first conductive portion 51, such that the width of the second conductive portion 52 is greater than the width of the first conductive portion 51. Viewed along the second direction Y, the first conductive portion 51 is located between adjacent components 43 and the second circuit board 42. Along the second direction Y, the second conductive portion 52 overlaps with component 43, and the insulating member 60 is located between the second conductive portion 52 and component 43.

[0050] In another embodiment, please refer to Figure 7In the third direction Z, the two opposite edges of the second conductive portion 52 extend beyond the two opposite edges of the first conductive portion 51, so that the width of the second conductive portion 52 is greater than the width of the first conductive portion 51. Viewed along the second direction Y, the first conductive portion 51 is located between adjacent components 43 and the second circuit board 42. Along the second direction Y, the second conductive portion 52 overlaps with the second circuit board 42 and components 43, and the insulating member 60 is located between the second conductive portion 52 and the second circuit board 42 and components 43. It can be understood that, viewed along the second direction Y, when the first conductive portion 51 is located between two adjacent components 43, the second conductive portion 52 can overlap with those two components 43.

[0051] By setting the width of the first conductive part 51 to be smaller than the width of the second conductive part 52, and making the second conductive part 52 overlap with the second circuit board 42 and / or components 43, the layout space of the first circuit board 41 is increased. Under the condition that the number of components 43 remains unchanged, the size of the first circuit board 41 in the third direction Z can be reduced, which is beneficial to improving the energy density of the electrochemical device 1.

[0052] In some embodiments, please refer to Figure 4 and Figure 5 Along the second direction Y, the extension 32 is located between the first conductive part 51 and the second conductive part 52, so that the extension 32 and the conductive member 50 share space in the second direction Y, which helps to reduce the space occupied by the electrochemical device 1.

[0053] In some embodiments, the width of the first conductive portion 51 along the third direction Z is 4mm-6mm. By controlling the width of the first conductive portion 51 within the above range, it is possible to ensure that the first conductive portion 51 has sufficient area to have sufficient connection strength with the first circuit board 41, while minimizing the layout space occupied by the first conductive portion 51 on the first circuit board 41, which is beneficial to reducing the size of the first circuit board 41 in the third direction Z.

[0054] In some embodiments, the conductive element 50 is a metal sheet, such as a nickel sheet. In some embodiments, when assembling the battery cell 100 and the protection circuit board 40, the nickel sheet is first soldered to the first circuit board 41, then the electrode terminal 30 is soldered to the nickel sheet, and finally the nickel sheet is folded so that the portion of the nickel sheet connected to the electrode terminal 30 overlaps with the second circuit board 42 and / or the component 43.

[0055] In some embodiments, please refer to Figure 8Along the first direction X, the distance between the second bent portion 53 and the second circuit board 42 is D1, and along the third direction Z, the distance between the first conductive portion 51 and the second circuit board 42 is D2. In some embodiments, 0.8mm ≤ D1 ≤ 2.0mm, 0.8mm ≤ D2 ≤ 2.0mm. For example, D1 can be 0.8mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2.0mm, or any two of these values, and D2 can be 0.8mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2.0mm, or any two of these values. When D1 and D2 are within the above ranges, the spacing between the conductive component 50 and the second circuit board 42 is appropriate, reducing the risk of interference between the conductive component 50 and the second circuit board 42, facilitating the soldering of the conductive component 50 to the first circuit board 41, and this spacing has little impact on the energy density of the electrochemical device 1.

[0056] In some embodiments, along the second direction Y, the orthographic projection of the first conductive part 51 and the orthographic projection of the second conductive part 52 are both located within the first circuit board 41. The conductive element 50 and the first circuit board 41 share space in the first direction X and the third direction Z, which helps to reduce the space occupied by the electrochemical device 1. In another embodiment, along the second direction Y, the orthographic projection of the first conductive part 51 is located within the first circuit board 41, and a portion of the orthographic projection of the second conductive part 52 is located outside the first circuit board 41.

[0057] In some embodiments, please refer to Figure 9 Viewed along the second direction Y, the edge of the second circuit board 42 has a notch 421, and part of the second conductive part 52 is located in the notch 421. With this arrangement, the second conductive part 52 and the second circuit board 42 share space, and the distance between the second circuit board 42 and the first conductive part 51 can be reduced, which is beneficial to reducing the space occupied by the electrochemical device 1.

[0058] In some embodiments, please refer to Figure 10 and Figure 11 One side of the conductive element 50 is connected to the first circuit board 41, and the other side of the conductive element 50 is connected to the extension 32 of the electrode terminal 30. Specifically, the third surface 501 of the conductive element 50 is connected to the first circuit board 51, and the fourth surface 502 of the conductive element 50 is connected to the extension 32 of the electrode terminal 30. Along the second direction Y, the conductive element 50 is located between the extension 32 and the first circuit board 41. Viewed along the second direction Y, the entire conductive element 50 is located between adjacent components 43 and the second circuit board 42. Along the third direction Z, the width of the extension 32 is greater than the width of the conductive element 50. Along the second direction Y, the extension 32 overlaps with the second circuit board 42 located on one side of the conductive element 50, and the insulating element 60 is located between the extension 32 and the second circuit board 42.

[0059] In another embodiment, along the second direction Y, the extension 32 overlaps only with the component 43 located on one side of the conductive element 50, or the extension 32 overlaps with the second circuit board 42 and the component 43 located on both sides of the conductive element 50. In yet another embodiment, viewed along the second direction Y, the entire conductive element 50 is located between two adjacent components 43, and along the second direction Y, the extension 32 overlaps with the two components 43 located on both sides of the conductive element 50.

[0060] In some embodiments, when the entire conductive element 50 is located between two adjacent elements on the first circuit board 41, the thickness of the conductive element 50 is greater than the thickness of the component 43 and / or the second circuit board 42, so as to avoid interference when the extension 32 overlaps with the component 43 and / or the second circuit board 42.

[0061] Please see Figure 12 One 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.

[0062] 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 variations 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, the battery cell including a battery cell housing and electrode terminals partially disposed within the battery cell housing, the electrode terminals partially extending out of the battery cell housing; A protective circuit board is located on one side of the battery cell housing along a second direction. The protective circuit board includes a first circuit board, a second circuit board, a connector, and components. The first circuit board includes a first surface. The second circuit board and the components are both connected to the first surface. The connector is disposed on the second circuit board. Along the second direction, the electrode terminals overlap with the second circuit board and / or the components. The second direction is perpendicular to the first direction, and the first direction is the thickness direction of the battery cell housing. A conductive component, wherein the conductive component is electrically connected to the first circuit board and the electrode terminals; An insulating element located between the second circuit board and at least one of the components and the electrode terminal.

2. The electrochemical device as described in claim 1, characterized in that, The electrode terminal includes a first bent portion and an extension portion. The extension portion extends along the first direction. The first bent portion extends from the edge of the cell housing and connects to the extension portion. The conductive element includes a first conductive portion, a second conductive portion, and a second bent portion connecting the first conductive portion and the second conductive portion. The first conductive portion and the second conductive portion are disposed opposite to each other along the second direction. The first conductive portion is connected to the first surface, and the second conductive portion is connected to the extension portion. Along a third direction, the width of the second conductive portion is greater than the width of the first conductive portion. Along the second direction, the second conductive portion overlaps with the second circuit board and / or the component. The third direction, the second direction, and the first direction are perpendicular to each other.

3. The electrochemical device as described in claim 2, characterized in that... Along the first direction, the distance between the second bent portion and the second circuit board is D1, and along the third direction, the distance between the first conductive portion and the second circuit board is D2, where 0.8mm≤D1≤2.0mm and 0.8mm≤D2≤2.0mm.

4. The electrochemical device as described in claim 3, characterized in that, Viewed along the second direction, the edge of the second circuit board has a notch, and a portion of the second conductive part is located in the notch.

5. The electrochemical device as described in claim 2, characterized in that, Along the second direction, the extension is located between the first conductive portion and the second conductive portion.

6. The electrochemical device as described in claim 2, characterized in that, Along the third direction, the width of the first conductive part is 4mm–6mm.

7. The electrochemical device as claimed in claim 1, characterized in that, Along the second direction, the conductive element is located between the electrode terminal and the first circuit board, with one side of the conductive element connected to the first circuit board and the other side of the conductive element connected to the electrode terminal.

8. The electrochemical device as described in claim 7, characterized in that, The thickness of the conductive element is greater than the thickness of the component and / or the thickness of the second circuit board.

9. The electrochemical device as claimed in claim 1, characterized in that, The first circuit board is a rigid printed circuit board, and the second circuit board is a flexible printed circuit board.

10. An electrical appliance, characterized in that, Includes the electrochemical device as described in any one of claims 1 to 9.

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