Electrochemical devices and electrical devices

Abstract

This application discloses an electrochemical device and an electronic device. The electrochemical device includes a housing, an electrode assembly, a first tab, and a polar pole assembly. The housing includes a main body and a first protrusion. The main body has a first cavity. The first protrusion has a second cavity and a first through-hole. The first through-hole and the first cavity are both connected to the second cavity. The polar pole assembly is installed in the first through-hole and is insulated from the housing. The electrode assembly is accommodated in the first cavity. One end of the first tab is connected to the electrode assembly, and the other end of the first tab enters the second cavity and is connected to the polar pole assembly. The main body includes a first top wall, the first protrusion includes a second top wall, the first top wall protrudes from the second top wall, and the first through-hole is provided in the second top wall. This configuration improves the space utilization of the electrochemical device.

Description

[Technical Field]

[0001] This application relates to the field of electrochemical devices, and more particularly to electrochemical devices and electrical utilizing devices. [Background technology]

[0002] Thin batteries are widely used in the fields of the Internet of Things and smart wearables due to their low power consumption, long cycle life, and high degree of customization. Generally, the total thickness of a battery is approximately equal to the sum of the thicknesses of the encapsulation materials on both sides, the positive and negative electrode sheets, and the separator. To achieve thinner batteries, related technologies typically reduce the total thickness by using an electrode assembly consisting of positive and negative electrode sheets coated on one side with an active material and a single-layer separator. However, due to structural design constraints, the locations of the circuit board and electrode posts are located on different planes of the battery. This means that the electrode post locations or the circuit board must be individually avoided during the overall mechanical design of the subsequent electrical device, reducing the space utilization rate of the electrochemical device. Summary of the Invention [Problem to be solved by the invention]

[0003] In view of the deficiencies existing in the related art, an object of the present application is to provide an electrochemical device and an electricity-using device that can improve the space utilization rate of the electrochemical device. [Means for solving the problem]

[0004] According to a first aspect of the present application, there is provided an electrochemical device including a housing, an electrode assembly, a first tab, and a polar pole assembly. The housing includes a main body having a first cavity and a first protrusion having a second cavity and a first through-hole, and the first through-hole and the first cavity both communicate with the second cavity. The polar pole assembly is disposed in the first through-hole and is insulated from the housing. The electrode assembly is accommodated in the first cavity, one end of the first tab is connected to the electrode assembly, and the other end of the first tab enters the second cavity and is connected to the polar pole assembly. The main body includes a first top wall, and the first protrusion includes a second top wall, the first top wall protrudes beyond the second top wall, and the first through-hole is disposed in the second top wall.

[0005] In some aspects of the present application, the distance between both ends of the first protrusion along the thickness direction of the main body is 1.00 mm to 3.00 mm.

[0006] In some aspects of the present application, the distance between both ends of the first protrusion along the width direction of the main body is 3 mm to 25 mm.

[0007] In some aspects of the present application, the distance between both ends of the first protrusion along the longitudinal direction of the main body is 3 mm to 6 mm.

[0008] In some aspects of the present application, the main body further includes a first bottom wall, and the first bottom wall is disposed opposite the first top wall along a thickness direction of the main body; the first protrusion further includes a second bottom wall, the second bottom wall being opposed to the second top wall along a thickness direction of the main body; The second bottom wall is flush with the first bottom wall.

[0009] In some aspects of the present application, a first side wall of the housing includes a first region and a second region, the first side wall extends along the length direction of the main body in the first region to form the first protrusion, and the first protrusion and the second region form an accommodating space, The electrochemical device further includes a circuit board fixed in the receiving space, the circuit board has a first electrical connection portion disposed so that a side closer to the first protrusion protrudes outward from the circuit board; the first electrical connection portion is electrically connected to the pole assembly; The first electrical connection is disposed between the first top wall and the second top wall.

[0010] In some aspects of the present application, the circuit board has a second electrical connection portion, the electrochemical device further comprises a second tab; One end of the second tab is electrically connected to the electrode assembly, and the other end of the second tab and the second electrical connection portion are both electrically connected to the housing.

[0011] In some aspects of the present application, the second electrical connection portion is electrically connected to an outer surface of the first protrusion, The connection point between the first protrusion and the second electrical connection portion and the first through hole are both located on the same side of the first protrusion.

[0012] In some aspects of the present application, a second protrusion further extends from the second region along the longitudinal direction of the main body, The first protrusion and the second protrusion are located at opposite ends of the first side wall along the width direction of the main body, and the circuit board is located between the first protrusion and the second protrusion.

[0013] In some aspects of the present application, the electrode post assembly includes an electrode post, a connection part, and an adhesive layer interposed between the electrode post and the connection part; the connecting component is fixed to the first protrusion, the electrode post has a first end and a connection portion; the first end is located outside the first protrusion and is electrically connected to the circuit board; one end of the connection portion is connected to the first end portion, and the other end of the connection portion is connected to the other end of the first tab after passing through the adhesive layer, the connection part, and the first through hole in sequence; There is a gap between the outer periphery of the connection portion and the wall surface of the first through hole.

[0014] In some aspects of the present application, the electrode column assembly includes an electrode post, a first insulating gasket, and a second insulating gasket; the electrode post has a first end, a connection portion, and a second end; the first end is located outside the first protrusion and is electrically connected to the circuit board; the second end is located within the second cavity and electrically connected to the electrode assembly; the connecting portion is connected to the first end and the second end through the first through hole, By the contraction of the first end and the second end, the first insulating gasket is interposed between the first end and the first protruding portion, and the second insulating gasket is interposed between the second end and the second protruding portion, Here, the first insulating gasket insulates the first protrusion from the connection portion.

[0015] In some aspects of the present application, the pole assembly further includes a metal gasket disposed between the first end and the first insulating gasket.

[0016] In some embodiments of the present application, the electrochemical device further includes a first insulating member and a second insulating member; the first insulating member and the second insulating member are both provided on an inner wall surface of the first protrusion, The first tab is located between the second insulating member and the first insulating member along the thickness direction of the electrochemical device.

[0017] In some aspects of the present application, the first protrusion further includes a second through-hole communicating with the second cavity, and the electrochemical device further includes a liquid injection plug provided in the second through-hole.

[0018] According to another aspect of the present application, there is further provided an electricity-using device including the electrochemical device described above.

[0019] One or more embodiments are illustratively described through the accompanying drawings. These illustrative descriptions do not constitute limitations on the embodiments. Elements in the figures with the same reference numerals are represented as similar elements. Dimensions on the drawings are not necessarily proportional unless otherwise specified. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a structural schematic diagram of an electrochemical device provided by an embodiment of the present application; [Figure 2] FIG. 2 is an exploded view of the structure of the electrochemical device shown in FIG. [Figure 3] 2 is a cross-sectional view of the electrochemical device shown in FIG. 1 taken along the line AA. [Figure 4] FIG. 2 is a structural schematic diagram of an electrochemical device provided by another embodiment of the present application. [Figure 5] FIG. 2 is a structural schematic diagram of an electrochemical device provided by yet another embodiment of the present application. [Figure 6] FIG. 6 is an exploded view of the structure of the electrochemical device shown in FIG. [Figure 7] FIG. 6 is a cross-sectional view of the BB portion of the electrochemical device shown in FIG. [Figure 8] FIG. 1 is a schematic diagram of an electrochemical device provided by yet another embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0021] The following will clearly and completely describe the technical aspects of the embodiments of the present application in accordance with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and does not constitute any limitation on the present invention and its application or use.

[0022] In the description of this application, orientations or positional relationships indicated by directional terms (such as "front, back, top, bottom, left, right," "sideways, lengthways, vertical, horizontal," "top, bottom," etc.) are generally based on the drawings and are intended solely to facilitate and simplify the description of this application. Unless otherwise stated, these directional terms do not indicate or imply that the devices or elements they refer to have a particular orientation or must be constructed and operated in a particular orientation. Therefore, they should not be understood as limiting the scope of protection of this application. The directional terms "inside, outside" refer to the inside or outside of the contour of each part itself.

[0023] In the description of this application, the use of words such as "first" and "second" to limit components is only for the purpose of easily distinguishing corresponding components, and unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0024] The electrochemical device in this application may be any device capable of carrying out an electrochemical reaction, i.e., the electrochemical device may be a primary battery or a secondary battery. For example, the secondary battery may be a lithium secondary battery, such as a lithium metal secondary battery, a lithium ion secondary battery, a lithium polymer secondary battery, a solid-state battery, or a lithium ion polymer secondary battery.

[0025] FIG. 1 is a structural schematic diagram of an electrochemical device provided by one embodiment of the present application. FIG. 2 is an exploded structural diagram of the electrochemical device shown in FIG. 1. FIG. 3 is a cross-sectional view of section A-A of the electrochemical device shown in FIG. 1. Referring to FIGS. 1 to 3 together, the electrochemical device includes a housing 10, an electrode assembly 20, a first tab 51, a second tab 52, a pole assembly 30, and a circuit board 40. The housing 10 is a mounting and supporting structure for each of the aforementioned components. The pole assembly 30 is attached to the housing 10 and is insulated from the housing 10. The electrode assembly 20 is accommodated within the housing 10, and the first tab 51 is electrically connected to the electrode assembly 20 and the pole assembly 30, respectively, and the second tab 52 is electrically connected to the electrode assembly 20 and the housing 10, respectively. The circuit board 40 is fixed to the housing 10 and electrically connected to the pole assembly 30 and the housing 10, respectively. The circuit board 40 is also electrically connected to a load, such as an electrical device, and is used to supply electrical energy to the load. Alternatively, the circuit board 40 may be electrically connected to an energy supply device and used to replenish electrical energy to the electrode assembly 20 of the electrochemical device. Furthermore, the circuit board 40 may protect the electrochemical device, for example, by preventing the electrochemical device from being over-discharged, over-charged, or exceeding its rated current. Furthermore, the circuit board 40 may provide output short-circuit protection for the electrochemical device. Furthermore, the electrochemical device may include an electrolyte filled inside the housing 10 so that the electrode assembly 20 can be immersed in the electrolyte.

[0026] Next, to clearly explain each orientation, each direction is defined using the coordinate system of FIG. 1 . Here, coordinate axis W indicates the direction in which the third side wall 1123 and the fourth side wall 1124 of the housing 10 are arranged opposite each other, is parallel to the plane on which the electrochemical device is located, and is also the width direction of the main body of the electrochemical device. Coordinate axis L indicates the direction in which the first side wall 1121 and the second side wall 1122 of the main body 11 are arranged opposite each other, is parallel to the plane on which the electrochemical device is located, and is also the longitudinal direction of the main body of the electrochemical device. Coordinate axis D indicates the direction in which the first top wall 111 and the first bottom wall 113 of the main body 11 are arranged opposite each other, is the direction in which the electrode sheets of the electrode assembly 20 are stacked, is also the thickness direction of the main body of the electrochemical device, and is perpendicular to the plane on which the electrochemical device is located. In other words, coordinate axis D is orthogonal to any two of coordinate axis L and coordinate axis W.

[0027] Based on the above definition of orientation, the housing 10, electrode assembly 20, pole assembly 30, and their specific structures will now be described based on the embodiments illustrated in the drawings. The nouns used below, such as "upper," "lower," "top," and "bottom," that indicate orientation or positional relationship, all refer to the third direction. Technical features of different embodiments of the present application described below may be combined if they do not conflict.

[0028] The housing 10 can be made of a conductive metal material such as stainless steel or a stainless steel alloy. Moreover, the housing has a corrosion-resistant coating on the inside, which allows it to withstand complex conditions such as high temperature, high pressure, and high corrosion present inside the housing 10. Referring to FIG. 3 in conjunction with FIG. 2, in this embodiment, the housing 10 has a substantially flat, rectangular shape and includes a main body 11 and a first protrusion 12. The first protrusion 12 and the main body 11 collectively define a space (not shown) for accommodating the circuit board 40.

[0029] The main body 11 has a first top wall 111, a first bottom wall 113, and a first side frame (not shown) formed by bending and extending from the periphery of the first top wall 111. The first side frame includes a first side wall 1121, a second side wall 1122, a third side wall 1123, and a fourth side wall 1124 that are connected in sequence. The first side wall 1121 and the second side wall 1122 are arranged opposite each other, and the third side wall 1123 and the fourth side wall 1124 are arranged opposite each other. The first protrusion 12 is located at one end of the first side wall 1121 in the first direction W. The first protrusion 12 extends from the first side wall 1121 to the outside of the main body 11 (in the second direction L).

[0030] The first protrusion 12 has a second top wall 121, a second bottom wall 122, and a second side frame (not shown) formed by bending and extending from the periphery of the second top wall 121. The second top wall 121 is obtained by first bending a first region 1121a of a first side wall 1121 of the main body 11 toward a first direction W and then bending and extending outward from the main body 11 (i.e., in a second direction L). That is, the second top wall 121, the first side frame, the first top wall 111 of the main body, and the first side frame of the main body are integrally formed. The second bottom wall 122 is formed such that a portion of the first bottom wall 113 of the main body extends outward from the main body 11. That is, the second bottom wall 122 and the first bottom wall 113 of the main body are integrally formed. Here, there is no other difference between the structures of the two, except that the thickness of the first protrusion 12 of the housing 10 is smaller than the thickness of the main body 11, and the size of the first protrusion 12 is smaller than the size of the main body 11. The end face of the first side frame away from the first top wall 111 can be connected to the first bottom wall 113 by adhesive bonding, joining, welding, or mechanical fastening so as to define, together with the first bottom wall 113, a first cavity 11a for sealing the electrode assembly 20. The end face of the second side frame away from the second top wall 121 is also connected to the second bottom wall 122 by a similar joining method so as to define, together with the second bottom wall 122, a second cavity 12a for accommodating a portion of the first tab 51. Here, the second region 1121b of the first side wall 1121 of the main body 11 is surrounded by the second side frame of the first protrusion 12 to form the above-mentioned accommodating space. Here, the first region 1121a and the second region 1121b are sequentially arranged along the first direction W. The specific structure of the housing 10 is not limited thereto. For example, in other embodiments of the present application, the housing 10 may have a regular shape, such as a flattened rectangular parallelepiped or cube as shown in FIG. 5, a cylinder, a prism, or a vertebra. This mainly depends on the specific shape of the electrode assembly 20 accommodated in the housing 10. Furthermore, in other embodiments of the present application, the first protrusion 12 may be provided on a side wall other than the first side wall 1121 of the first edge frame. Also, in some embodiments of the present application, the thickness of the first protrusion 12 may be the same as the thickness of the main body 11. These descriptions will not be expanded here.

[0031] Continuing to refer to FIG. 2 , the second top wall 121 of the first protrusion 12 has a first through-hole 121a and a second through-hole 121b, both of which communicate with the second cavity 12a. The first through-hole 121a is for attaching the electrode post assembly 30, which will be described later. The second through-hole 121b can serve as a liquid injection hole. During a liquid injection process for the electrochemical device, the second through-hole 121b cooperates with a liquid injection head of a liquid injection device to inject an electrolyte into the second cavity 12a through the second through-hole 121b, and then the electrolyte flows into the first cavity 11a of the main body 11, wetting the electrode assembly 20 accommodated in the first cavity 11a. After the liquid injection process is completed, a liquid injection plug 50 is sealed into the second through-hole 121b to prevent electrolyte leakage from within the housing 10. The liquid injection plug 50 forms an airtight seal with the second top wall 121 of the first protrusion 12 by, but not limited to, gluing, welding, or bonding. Of course, if the electrode assembly 20 can achieve electronic conduction between the positive and negative electrodes without relying on an electrolyte, the second through-hole 121b and the liquid injection plug 50 may not be provided depending on actual usage needs. This further improves the sealing performance of the housing 10 and is advantageous for maintaining stable operation of the electrode assembly 20.

[0032] Furthermore, the first through-hole 121a and the second through-hole 121b are spaced apart from each other along the first direction W on the same surface of the second top wall 121. During the assembly process of the electrochemical device, the number of times the electrochemical device needs to be turned over before assembly can be reduced, and the steps of attaching the electrode post assembly 30 and filling the electrolyte can be completed in one operation, further improving the assembly efficiency of the electrochemical device. Furthermore, the second through-hole 121b is closer to the fourth side wall 1124 of the body 11 than the first through-hole 121a. In other words, the first through-hole 121a is located adjacent to the receiving space of the housing 10, and the electrode post assembly 30 is located in the first through-hole 121a. After the circuit board 40 is fixed in the receiving space of the housing 10, the circuit board 40 is electrically connected to the electrode post assembly 30, shielding the area between them. Since the second through-hole 121b is far from the first through-hole 121a, the second through-hole 121b is less likely to be blocked by the blocking area formed between the circuit board 40 and the electrode post assembly 30. That is, the second through-hole 121b is always exposed at the second top wall 121 of the first protrusion 12, which makes it easier for the electrochemical device to complete the subsequent liquid replenishment process.

[0033] The electrode assembly 20 is housed in the second cavity 12a of the main body 11 and is insulated from the inner surface of the main body 11. Referring to FIGS. 2 and 3, in this embodiment, the electrode assembly 20 includes at least one first electrode sheet (not shown), at least one second electrode sheet (not shown), and a separator (not shown) separating the first and second electrode sheets. The first and second electrode sheets have opposite polarities. Along the third direction D, one first electrode sheet, one separator, and one second electrode sheet are alternately stacked to form a stacked structure. A blank current collector of each first electrode sheet extends from one end of the stacked structure near the first protrusion 12 and is electrically connected to one end of the first tab 51. The other end of the first tab 51 extends into the first cavity 11a of the first protrusion 12 after being folded multiple times and is then spot-welded, laser-welded, or ultrasonically welded to the electrode post assembly 30. Here, the first tab 51 may be made of a metallic conductive material such as aluminum. In this case, each first electrode sheet may be a positive electrode sheet. The blank current collector of each second electrode sheet protrudes from one end of the laminated structure near the first sidewall 1121 of the main body 11 and is electrically connected to one end of the second tab 52. The other end of the second tab 52 is bent and then spot-welded, laser-welded, or ultrasonically welded to the first sidewall 1121 of the housing 10. Here, the second tab 52 may be made of a metallic conductive material such as copper or nickel. In this case, each second electrode sheet may be a negative electrode sheet. It is understood that the specific structure of the electrode assembly 20 is not particularly limited. For example, in some other embodiments of the present application, the electrode assembly 20 may be a winding-type electrode assembly 20. In addition, there are various options for the first and second electrode sheets in the electrode assembly 20. For example, the first and second electrode sheets may be formed as a liquid collector with an active material layer applied on one side, or may be formed as a liquid collector with an active material layer applied on both sides.

[0034] The electrode post assembly 30 is disposed corresponding to the first through-hole 121a of the second top wall 121 and is electrically connected to the other end of the first tab 51. When the electrochemical device is electrically connected to a load of an electricity-using device, electrical energy is output to the load sequentially along the first tab 51, the electrode post assembly 30, and the circuit board 40. When the electrochemical device is electrically connected to an energy supply device, electrical energy can be input to the electrode assembly 20 through the circuit board 40, the electrode post assembly 30, and the first tab 51.

[0035] Continuing with reference to the example shown in FIG. 3 , in this embodiment, the electrode post assembly 30 includes an electrode post 31, a connecting part 32, and an adhesive layer 33 interposed between the electrode post 31 and the connecting part 32. The electrode post 31 has a generally T-shaped cross section and may be made of a conductive metal material such as aluminum or an aluminum alloy. Specifically, the electrode post 31 has a first end (not shown) and a connecting part (not shown) integrally formed with the first end. The first end is exposed at the second top wall 121 of the first protrusion 12 and is electrically connected to a circuit board 40 accommodated in the accommodation space of the housing 10. The first end can be connected to the connecting part 32 via the adhesive layer 33 to form an integrated structure. In this way, the electrode post assembly 30 can be used as a versatile part for application to electrochemical devices of different sizes. The connecting part 32 is adhered, bonded, welded, or otherwise bonded to the surface of the second top wall 121 facing away from the second cavity 12a to achieve an airtight seal therebetween. The connection portion extends from the middle of the first end portion through the adhesive layer 33, the connecting piece 32, and the first through-hole 121a of the second top wall 121, and then into the second cavity 12a, where it is electrically connected to the other end of the first tab 51. The housing 10 is electrically connected to the second electrode sheet of the electrode assembly 20 via the second tab 52, and the electrode post 31 is electrically connected to the first electrode sheet of the electrode assembly 20 via the first tab 51. That is, there is reverse polarity between the housing 10 and the electrode post 31. To prevent short circuits between the housing 10 and the electrode post 31, electrical insulation is required between the electrode post 31 and the housing 10. Therefore, the connection portion of the electrode post 31 must maintain a gap with the housing 10, and at least one of the connecting piece 32 and the adhesive layer 33 must be made of an electrically insulating material. For example, if the adhesive layer 33 is hardened with non-conductive sealing rubber, the connecting piece 32 may be made of a metal material and welded to the second top wall 121 of the second protrusion 13. Alternatively, if the adhesive layer 33 is cured with conductive sealing rubber, the connecting piece 32 may be a non-metallic material and is adhesively fixed to the second top wall 121 of the second protruding portion 13 .

[0036] Furthermore, when viewed from the outside of the first protrusion 12 of the housing 10 toward the inside of the second cavity 12a of the first protrusion 12 (third direction D), the outer diameters of the first end of the electrode post 31, the adhesive layer 33, and the connecting component 32 increase sequentially and are distributed in a stepped pattern overall. The advantages of this arrangement include: on the one hand, the first end of the electrode post 31 has a larger contact area than the connecting portion, making it easier to connect the first end of the electrode post 31 to the outside; on the other hand, because the area of ​​the adhesive layer 33 itself is larger than the first end of the electrode post 31 but smaller than the area of ​​the connecting component 32 itself (i.e., the first end of the electrode post 31 is separated from the connecting component 32 by the adhesive layer 33), short-circuiting between the circuit board 40 and the connecting component 32 during electrical connection between the electrochemical device and the circuit board 40 is reduced. Furthermore, a larger contact area can be achieved between the connecting component 32 and the second top wall 121 of the first protrusion 12. This means that it is easy to fix the pole assembly 30 to the second top wall 121 and that the electrolyte in the housing 10 is prevented from leaking from the gap between them.

[0037] Of course, the specific structure of the electrode post assembly 30 is not limited thereto. For example, in other embodiments of the present application, the electrode post assembly 30 may include only the electrode post 31 configured as described above. In this case, the first end of the electrode post 31 may be adhered to the surface of the second top wall 121 facing the second cavity 12a via an insulating sealant or adhesive. As a result, the connection portion extends from the middle of the first end through the first through-hole 121a of the second top wall 121 into the second cavity 12a and is electrically connected to the other end of the first tab 51. Alternatively, the second tab 52 having the opposite polarity may be insulated and protrude out of the housing 10 to be electrically connected to the load. The first end of the electrode post 31 may be welded or bonded to the surface of the second top wall 121 facing the second cavity 12a.

[0038] The electrode post assembly 30 may be crimped into the first through-hole 121a of the second top wall 121 by a crimping device. As shown in FIGS. 5 to 7, in some other embodiments of the present application, the electrode post assembly 30' differs from the above-described electrode post assembly 30 in that it may include a first insulating gasket 32' and a second insulating gasket 33' in addition to the electrode post 31'. The electrode post 31' has a substantially U-shaped cross section and may be made of a conductive metal material such as aluminum or an aluminum alloy. Specifically, the electrode post 31' includes a first end (not shown), a second end (not shown), and connecting portions (not shown) integrally connected to the first end and the second end, respectively. The first end is exposed at the second top wall 121 of the first protrusion 12 and is electrically connected to a circuit board accommodated in the accommodation space of the housing 10. The second end is located within the second cavity 1 and is electrically connected to the other end of the first tab 51. The first insulating gasket 32' is interposed between the first end and the surface of the second top wall 121 facing outward from the housing 10. A portion of the first insulating gasket 32' extends through the first through-hole 121a into the second cavity 12a. The connecting portion can penetrate this portion of the first insulating gasket 32'. This portion of the first insulating gasket 32' overfits the peripheral wall surface of the first through-hole 121a due to the stretching action of the connecting portion. The second insulating gasket 33' is interposed between the second end and the surface of the second top wall 121 facing inward from the second cavity 12a. Furthermore, the clamping action between the second end and the first end tightly contacts the second insulating gasket 33', the surface of the second top wall 121 facing inward from the second cavity 12a, and the end face of the first insulating gasket 32' extending into the second cavity 12a. Compared with fastening the electrode post 31' to the first protrusion 12 via a connection method such as adhesive bonding or welding, fastening with a rivet enhances the ultimate connection strength between the electrode post 31' and the first protrusion 12. This improves the stress weak point at the second through-hole 121b of the housing, improving the mechanical reliability and stability of the electrochemical device.Furthermore, by placing a metal gasket 34' between the first end and the first insulating gasket 32', the pressure of the electrode post 31' against the first insulating gasket 32' can be dispersed, thereby reducing the crimping defect rate of the electrode post assembly 30'.

[0039] In order to improve short circuits between the first tab 51 and the housing 10, particularly at one end of the tab connected to the electrode post 31 of the electrode pole assembly 30, a first insulating material 61 such as insulating tape is provided between the first tab 51 and the inner wall surface of the second top wall 121 where the electrode post 31 is located, and a second insulating material 62 such as insulating tape is provided between the first tab 51 and the inner wall surface of the second bottom wall 122 where the electrode post 31 is located, thereby preventing electrical contact between the first tab 51 and the first protrusion 12, which has a different polarity.

[0040] The circuit board 40 is illustrated in FIG. 4 along with FIG. 1. In this embodiment, the circuit board 40 has a generally flat rectangular parallelepiped shape. One long, thin end of the circuit board 40 may be fixed to the first side wall 1121 of the housing 10 via a structural component such as an adhesive or a snap, allowing the circuit board 40 to be accommodated within the housing 10 in a position that reduces the thickness of the electrochemical device. To conserve space in the electrochemical device, the first electrical connection portion 41 of the circuit board 40, which is connected to the electrode post 31 of the electrode post assembly 30, and the second electrical connection portion 42 of the circuit board 40, which is connected to the housing 10, extend outward from the circuit board 40 on the side closer to the first protrusion 12. The third electrical connection portion 43, which is connected to the outside of the circuit board 40, extends outward from the circuit board 40 on the side farther from the first protrusion 12. This arrangement not only saves space in the height direction of the electrochemical device, but also provides excellent fall prevention performance when the electrochemical device is subjected to impact, since the connection points between the circuit board 40 and the housing 10 and the connection points between the circuit board 40 and the pole assembly 30 are alternately arranged. Of course, the second electrical connection portion 42 of the circuit board 40 may be connected to either outer surface of the housing 10, and is not limited to this.

[0041] As described above, in the electrochemical device according to the embodiment of the present application, the first protrusion 12 is locally provided on the first side wall 1121 of the body 11, so that the first protrusion 12 protrudes out of the body 11 in the second direction L. Therefore, the first protrusion 12 occupies the packaging space of the electrical device along the second direction L, and the circuit board 40 is mounted in the receiving space formed by the first protrusion 12 and the first side wall 1121. As a result, the space occupied by the first protrusion 12 is effectively utilized by the circuit board 40, and the space occupied by the electrical device along the second direction L and the third direction D is reduced. In other words, the overall design of the subsequent electrical device does not require separate avoidance processing for the portion where the electrode post 31 is located, thereby further improving the space utilization rate of the electrochemical device.

[0042] It should be noted that when the electrochemical device is a thin electrochemical device, as shown in FIG. 1, the thickness of the main body 11 (i.e., the distance between both ends of the main body 11 along the third direction D) is 1 mm or more and less than 3 mm. For example, the total thickness is 1.8 mm, 1.7 mm, 1.6 mm, or 1.5 mm. The thickness D1 of the first protrusion 12 (the distance between both ends of the first protrusion along the third direction D) is 1 mm to 3 mm, more specifically, 1 mm to 1.5 mm. This satisfies the requirement for the total thickness of the connection between the first protrusion 12 and the circuit board 40 to be equal to or less than the total thickness of the main body 11 as much as possible. Meanwhile, other structural parameters of the first protrusion 12, such as its width and length, should also be determined based on the width and length of the circuit board 40. For example, the length L1 of the first protrusion 12 (i.e., the distance between both ends of the first protrusion 12 along the second direction L1) may be 3 mm to 6 mm, more specifically, 4 mm to 5.5 mm. The width W1 of the first protrusion 12 (the distance between both ends of the first protrusion 12 along the first direction W) is 3 mm to 25 mm. This allows the first protrusion 12 itself to satisfy the structural strength while opening the first through-hole 121a and the second through-hole 121b.

[0043] To improve the drop prevention performance of the electrochemical device, particularly along the first direction W, one end of the circuit board 40 is not protected by the first protrusion 12. As shown in FIG. 8 , in some other embodiments of the present disclosure, a second protrusion 13 further extends from the first side wall 1121 of the body 11. The specific structure of the second protrusion 13 is generally the same as the specific structure of the first protrusion 12, so the description of the first protrusion 12 may be referred to and will not be described in detail here. Along the first direction W, the first protrusion 12 is located at one end of the first side wall 1121, and the second protrusion 13 is located at the other end of the first side wall 1121. The first protrusion 12 and the second protrusion 13 together surround and form an accommodating space for accommodating the circuit board 40. A third electrical connection portion 43 connected to the outside of the circuit board 40 may be fixed to the second protrusion 13 and disposed so as to be insulated from the second protrusion 13. This further increases the connection area between the circuit board 40 and the housing 10, and both ends of the circuit board 40 are protected by the first protrusion 12 and the second protrusion 13, respectively, improving the fall prevention performance of the electrochemical device in the third direction D. Furthermore, the blank current collectors of each second electrode sheet are arranged near one end of the second protrusion 13. Each blank current collector of each second electrode sheet protrudes from one end of the first side wall 1121 of the laminated structure, which is closest to the main body 11, outside the laminated structure, and is electrically connected to one end of the second tab 52. The other end of the second tab 52 is bent and then spot-welded, laser-welded, or ultrasonically welded to the first side wall 1121 of the housing 10. In addition, the second electrical connection portion 42 of the circuit board 40 may be arranged to be fixed to the second protrusion 13.

[0044] The present application also provides an electricity-using device based on the same inventive concept. The electricity-using device includes the electrochemical device according to any of the above-described embodiments and a load powered by the electrochemical device. In this embodiment, the electricity-using device includes a mobile phone. It is understood that in other embodiments of the present application, the electricity-using device may be other power-driven devices such as a tablet, a personal computer, or a drone.

[0045] The above description is merely an example of the present application and does not limit the scope of the patent of the present application. Any equivalent structure or equivalent flow conversion made by using the contents of the specification and drawings of the present application, or directly or indirectly used in other related technical fields, is included in the scope of the claims of the present application.

Claims

1. a housing, an electrode assembly, a first tab, and a pole assembly; the housing includes a body and a first protrusion; The body is provided with a first cavity; The first protrusion has a second cavity and a first through hole, the first through hole and the first cavity both communicate with the second cavity; the pole assembly is installed in the first through-hole and is insulated from the housing; the electrode assembly is housed in the first cavity; an electrochemical device, wherein one end of the first tab is connected to the electrode assembly, and the other end of the first tab extends into the second cavity and is connected to the pole assembly; the main body includes a first top wall, the first protrusion includes a second top wall, the first top wall protrudes from the second top wall, and the first through hole is provided in the second top wall.

2. The first protrusion satisfies at least one of the following conditions 1 to 3: Condition 1 is that the distance between both ends of the first protrusion along the thickness direction of the main body is 1.00 mm to 3.00 mm, Condition 2 is that the distance between both ends of the first protrusion along the width direction of the main body is 3 mm to 25 mm, 2. The electrochemical device according to claim 1, wherein condition 3 is that the distance between both ends of the first protrusion along the longitudinal direction of the main body is 3 mm to 6 mm.

3. the body further includes a first bottom wall; The first bottom wall is disposed opposite the first top wall along the thickness direction of the main body, The first protrusion further includes a second bottom wall, and the second bottom wall is disposed to face the second top wall along a thickness direction of the main body.

2. The electrochemical device according to claim 1, wherein the second bottom wall is flush with the first bottom wall.

4. a first side wall of the housing including a first region and a second region, the first side wall extending along a length direction of the main body in the first region to form the first protrusion, the first protrusion and the second region forming an accommodating space; The electrochemical device further includes a circuit board fixed in the receiving space, the circuit board has a first electrical connection portion disposed so that a side closer to the first protrusion protrudes outward from the circuit board; the first electrical connection portion is electrically connected to the pole assembly; 2. The electrochemical device of claim 1, wherein the first electrical connection portion is disposed between the first top wall and the second top wall.

5. the circuit board has a second electrical connection portion; the electrochemical device further comprises a second tab; 5. The electrochemical device according to claim 4, wherein one end of the second tab is electrically connected to the electrode assembly, and the other end of the second tab and the second electrical connection portion are both electrically connected to the housing.

6. the second electrical connection portion is electrically connected to an outer surface of the first protrusion; 6. The electrochemical device according to claim 5, wherein the connection point between the first protrusion and the second electrical connection portion and the first through hole are both located on the same side of the first protrusion.

7. a second protrusion further extending from the second region along the longitudinal direction of the main body; 5. The electrochemical device according to claim 4, wherein the first protrusion and the second protrusion are located at both ends of the first side wall along the width direction of the main body, and the circuit board is located between the first protrusion and the second protrusion.

8. The electrode post assembly includes an electrode post, a connection part, and an adhesive layer interposed between the electrode post and the connection part; the connecting component is fixed to the first protrusion, The electrode post has a first end and a connection portion; the first end is located outside the first protrusion and is electrically connected to the circuit board; one end of the connection portion is connected to the first end portion, and the other end of the connection portion is connected to the other end of the first tab after passing through the adhesive layer, the connection part, and the first through hole in sequence; 5. The electrochemical device according to claim 4, wherein a gap exists between an outer periphery of the connection portion and a wall surface of the first through hole.

9. the electrode column assembly includes an electrode post, a first insulating gasket, and a second insulating gasket; the electrode post has a first end, a connection portion, and a second end; the first end is located outside the first protrusion and is electrically connected to the circuit board; the second end is located within the second cavity and electrically connected to the electrode assembly; the connecting portion is connected to the first end and the second end through the first through hole, By the contraction of the first end and the second end, the first insulating gasket is interposed between the first end and the first protruding portion, and the second insulating gasket is interposed between the second end and the second protruding portion, 5. The electrochemical device according to claim 4, wherein the first insulating gasket insulates the first protrusion from the connection portion.

10. 10. The electrochemical device of claim 9, wherein the pole assembly further comprises a metal gasket disposed between the first end and the first insulating gasket.

11. the electrochemical device further includes a first insulating member and a second insulating member; the first insulating member and the second insulating member are both provided on an inner wall surface of the first protrusion, 2. The electrochemical device according to claim 1, wherein the first tab is located between the second insulating member and the first insulating member along the thickness direction of the electrochemical device.

12. The first protrusion is further provided with a second through hole communicating with the second cavity, 12. The electrochemical device according to claim 1, further comprising a liquid injection plug provided in the second through hole.

13. An electricity-using device comprising the electrochemical device according to any one of claims 1 to 12.

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