Electrochemical devices and electronic devices

Abstract

The present application relates to an electrochemical device and an electronic device, comprising a housing portion enclosing a housing cavity, wherein the housing portion is provided with a mounting hole that penetrates its inner surface and outer surface. It also comprises a first insulating member, a second insulating member, a first feedthrough member, a second feedthrough member and a third feedthrough member. The first insulating member is attached to the inner surface, and the first insulating member is provided with a first through hole that communicates with the mounting hole. The second insulating member is attached to the outer surface, and the second insulating member is provided with a second through hole that communicates with the mounting hole. The first feedthrough member is attached to the end face of the first insulating member that faces away from the second insulating member. The second feedthrough member is attached to the end face of the second insulating member that faces away from the first insulating member. The third feedthrough member is arranged in the first through hole, the mounting hole and the second through hole, and is electrically connected between the first feedthrough member and the second feedthrough member. This structure can increase the sealing area, improve the sealing performance, and alleviate the deformation and deflection of the third feedthrough member to reduce the short circuit risk of the electrochemical device.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of electrochemical devices, and in particular to an electrochemical device and an electronic device. Background Art

[0002] The conduction structure of a hard-shell battery usually includes components such as a pole and a sealing ring. The sealing ring is arranged between the pole and the battery shell to separate the pole and the shell from an insulating member. The pole is often fixed to the shell by riveting, and the sealing ring is arranged between the pole and the shell. During the riveting process of the pole, the sealing ring can be clamped and fixed between the pole and the shell.

[0003] However, this method of physically riveting the sealing ring makes it difficult for the sealing ring to fully fill the micropores on the surface of the shell and the pole, and the overall interface has a high water permeability. In addition, during riveting, the shaft of the pole is easily deformed and deflected, resulting in poor sealing performance of the battery, and even causing the pole to contact the shell and cause a short circuit. Summary of the invention

[0004] The present application aims to provide an electrochemical device and an electronic device to improve the technical problems of poor sealing performance of the electrochemical device and easy deflection of the pole shaft.

[0005] In a first aspect of the present application, an electrochemical device is provided, comprising a housing portion enclosing a housing cavity, the housing portion being provided with a mounting hole penetrating the inner surface and the outer surface of the housing portion. The electrochemical device further comprises a first insulating member, a second insulating member, a first feedthrough member, a second feedthrough member and a third feedthrough member. The first insulating member is fitted and connected to the inner surface, and the first insulating member is provided with a first through hole communicating with the mounting hole. The second insulating member is fitted and connected to the outer surface, and the second insulating member is provided with a second through hole communicating with the mounting hole. The first feedthrough member is fitted and connected to the end face of the first insulating member facing away from the second insulating member. The second feedthrough member is fitted and connected to the end face of the second insulating member facing away from the first insulating member. The third feedthrough member is arranged in the first through hole, the mounting hole and the second through hole, and the third feedthrough member is electrically connected between the first feedthrough member and the second feedthrough member.

[0006] In the above technical solution, since the first feed-through is fitted and connected to the end face of the first insulating member facing away from the second insulating member, and the second feed-through is fitted and connected to the end face of the second insulating member facing away from the first insulating member, by relatively crimping the first feed-through and the second feed-through, the first insulating member can be stably bonded between the first feed-through and the accommodating portion, and the second insulating member can be stably bonded between the second feed-through and the accommodating portion. The sealing structure of the inner and outer double-layer insulating members increases the effective sealing area and ensures the reliability of the sealing of the electrochemical device. Compared with the traditional physical riveting method, relatively crimping the two insulating members makes it easier for the two insulating members to fill the surface micropores of the accommodating portion and each feed-through, which is beneficial to improving the waterproof effect of the electrochemical device.

[0007] At the same time, the structure in which the two insulating parts are crimped relative to each other has little effect on the third feed-through (i.e., the pole shaft portion). The third feed-through does not need to be riveted to bear force, which can alleviate the deformation and deflection of the third feed-through, which is not only beneficial to improving the sealing of the electrochemical device, but also can reduce the short circuit risk of the electrochemical device; secondly, the diameter of the third feed-through (or the cross-sectional area perpendicular to its axial direction) can also be set smaller to meet the miniaturization or thinning design requirements of the electrochemical device.

[0008] In some embodiments, the first insulating member and / or the second insulating member extend to the mounting hole. The first insulating member and / or the second insulating member can insulate and separate the third feedthrough member from the accommodating portion in the mounting hole, and the first insulating member and / or the second insulating member can fill the gap between the inner wall of the mounting hole and the third feedthrough member, which can not only further improve the sealing performance, but also further reduce the short circuit risk of the electrochemical device.

[0009] In some embodiments, a first plug hole is provided on the first feedthrough, and the first plug hole is communicated with the first through hole. A second plug hole is provided on the second feedthrough, and the second plug hole is communicated with the second through hole. The third feedthrough includes a first end and a second end that are arranged opposite to each other. The first end is plugged into the first plug hole and is electrically connected to the first feedthrough in the first plug hole. The second end is plugged into the second plug hole and is electrically connected to the second feedthrough in the second plug hole, so that the positioning and crimping of the first feedthrough and the second feedthrough can be facilitated.

[0010] In some embodiments, the first feedthrough has a first surface facing away from the second feedthrough, and the first end is flush with the first surface. This structure can facilitate the connection of the first end with the first feedthrough, and can also increase the contact area between the pole conductive structure (the first feedthrough, the second feedthrough, and the third feedthrough electrically connected as a whole) and the electrode assembly to facilitate electrical connection with the electrode assembly.

[0011] Optionally, the second feedthrough has a second surface facing away from the first feedthrough, and the second end is flush with the second surface. This structure can facilitate welding of the second end with the second feedthrough, and can also increase the contact area between the pole conduction structure and the external circuit, so as to facilitate transfer welding with the external circuit, increase welding tension, and ensure welding stability. In addition, since the second end is flush with the second surface and has no protruding structure, the height of the pole conduction structure can be minimized to meet the requirements of miniaturization of the electrochemical device.

[0012] In some embodiments, the third feed-through also includes a first portion connected between the first end and the second end. The cross-sectional area of ​​the first end and the cross-sectional area of ​​the second end are both smaller than the cross-sectional area of ​​the first portion. The cross-sectional area is a cross-sectional area of ​​the first end, the second end, or the first portion in a direction perpendicular to the first end to the second end. This structure can facilitate the user to relatively crimp the first feed-through and the second feed-through, and can reduce the risk of damage to the first insulating member and the second insulating member due to transitional crimping.

[0013] In some embodiments, the first feed-through and the third feed-through are integrally formed, and there is no need to open a first plug-in hole on the first feed-through, thereby eliminating the step of plugging the third feed-through into the first feed-through, which can improve the overall strength of the first feed-through and the third feed-through, and can further reduce the risk of deformation and tilting of the third feed-through.

[0014] Optionally, the second feed-through and the third feed-through are integrally formed, and there is no need to open a second plug-in hole on the second feed-through, thereby eliminating the step of plugging the third feed-through and the second feed-through, thereby improving the overall strength of the second feed-through and the third feed-through and reducing the risk of deformation and tilting of the third feed-through.

[0015] In some embodiments, the third feedthrough includes a first section close to the first feedthrough and a second section close to the second feedthrough, and the first section and the second section are electrically connected to each other. The first section is integrally formed with the first feedthrough, and the second section is integrally formed with the second feedthrough. No plug-in holes are provided in the first feedthrough and the second feedthrough, which can reduce the corresponding hole-opening steps and reduce the production cost. When the first section and the second section abut against each other, it indicates that the first feedthrough and the second feedthrough are crimped.

[0016] In some embodiments, a first plug-in position is provided on the end surface of the first section facing the second section, a first plug-in component is provided on one end of the second section facing the first plug-in position, the first plug-in component is adapted to the first plug-in component, and the first plug-in component is used to be plugged into the first plug-in position. By providing the first plug-in component and the first plug-in position, the positioning connection between the first section and the second section can be facilitated, and at the same time, due to the restrictions of the first plug-in position and the first plug-in component, the relative movement between the first section and the second section can be reduced to ensure the stability of the overall structure.

[0017] In some embodiments, the first insulating member and the second insulating member can melt when the temperature rises to a first threshold value, and can generate a pressure relief channel connecting the accommodating cavity and the outside of the accommodating portion under the action of the gas pressure in the accommodating cavity.

[0018] Under normal working conditions (i.e., normal operation of the electrochemical device), the first insulating member and the second insulating member can realize the sealing and insulating function. When the electrochemical device has thermal runaway, i.e., when the temperature in the accommodation chamber rises to the first threshold value, the gas in the accommodation chamber expands due to the heat and the gas is continuously generated in the accommodation chamber, the first insulating member and the second insulating member melt, and under the action of the gas pressure in the accommodation chamber, a pressure relief channel connecting the accommodation chamber and the outside is generated to reduce the gas pressure in the accommodation chamber, which can effectively prevent the electrochemical device from exploding due to thermal runaway.

[0019] In some embodiments, the first insulating member includes a first sub-insulator, a second sub-insulator and a third sub-insulator; the second sub-insulator is connected between the first sub-insulator and the third sub-insulator, the first sub-insulator is connected to the first feed-through, and the third sub-insulator is connected to the accommodating portion; the melting points of the first sub-insulator and the third sub-insulator are less than or equal to the first threshold value, and the melting point of the second insulating member is greater than the first threshold value.

[0020] The melting points of the first sub-insulator and the third sub-insulator are less than or equal to the first threshold value, that is, when the temperature reaches the first threshold value, the first sub-insulator and the third sub-insulator melt to generate a pressure relief channel to quickly discharge the gas. The melting point of the second sub-insulator is greater than the first threshold value, that is, the second sub-insulator still maintains a fixed shape at this time, and the second sub-insulator still adheres to the first sub-insulator and the third sub-insulator in a hot-melt state to improve the overall strength of the first insulating member, thereby improving the stability of the bonding between the accommodating portion and the pole conduction structure, and reducing the hot melt overflow of the first sub-insulator and the third sub-insulator.

[0021] The second insulating member includes a fourth sub-insulator, a fifth sub-insulator and a sixth sub-insulator; the fifth sub-insulator is connected between the fourth sub-insulator and the sixth sub-insulator, the fourth sub-insulator is connected to the accommodating portion, and the sixth sub-insulator is connected to the second feed-through member; the melting points of the fourth sub-insulator and the sixth sub-insulator are less than or equal to the first threshold value, and the melting point of the fifth sub-insulator is greater than the first threshold value. In this way, when the temperature rises to the first threshold value, the first sub-insulator, the third sub-insulator, the fourth sub-insulator and the sixth sub-insulator are all melted to generate a pressure relief channel, while the second sub-insulator and the fifth sub-insulator are still in a solid state, so as to ensure the structural stability of each insulating member and reduce the amount of glue overflow.

[0022] In some embodiments, along the direction from the third feedthrough to the first insulating member, the connection width between the first insulating member and the first feedthrough is W1, satisfying 0.2mm≤W1≤2mm; and / or, along the direction from the third feedthrough to the second insulating member, the connection width between the second insulating member and the second feedthrough is W2, satisfying 0.2mm≤W2≤2mm. This design can shorten the length of the thermal runaway pressure relief path of the electrochemical device, improve the pressure relief sensitivity of the electrochemical device, and ensure the sealing reliability.

[0023] Furthermore, along the direction from the third feedthrough to the first insulating member, the connection width between the first insulating member and the first feedthrough is W1, satisfying 0.3mm≤W1≤1mm; and / or, along the direction from the third feedthrough to the second insulating member, the connection width between the second insulating member and the second feedthrough is W2, satisfying 0.3mm≤W2≤1mm.

[0024] In a second aspect, the present application further proposes an electronic device, comprising an electrochemical device as described in any embodiment of the first aspect above.

[0025] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on the drawings.

[0027] Figure 1 A schematic diagram of the structure of an electrochemical device according to some embodiments of the present application;

[0028] Figure 2 An exploded view of an electrochemical device according to some embodiments of the present application;

[0029] Figure 3 It is a schematic diagram of assembling the pole conduction structure and various insulating components of some embodiments of the present application;

[0030] Figure 4 An exploded view of an electrochemical device according to some embodiments of the present application;

[0031] Figure 5 It is a schematic diagram of assembling the pole conduction structure and various insulating components of some embodiments of the present application;

[0032] Figure 6It is a schematic diagram of assembling the pole conduction structure and various insulating components of some embodiments of the present application;

[0033] Figure 7 It is a schematic diagram of assembling the pole conduction structure and various insulating components of some embodiments of the present application;

[0034] Figure 8 It is a schematic diagram of assembling the pole conduction structure and various insulating components of some embodiments of the present application;

[0035] Fig. 9 It is a schematic diagram of assembling the pole conduction structure and various insulating components of some embodiments of the present application;

[0036] Fig.10 It is a schematic diagram of assembling the pole conduction structure and various insulating components of some embodiments of the present application;

[0037] Fig.11 It is a schematic diagram of assembling the pole conduction structure and various insulating components of some embodiments of the present application;

[0038] Fig.12 It is a schematic diagram of assembling the pole conduction structure and various insulating components of some embodiments of the present application;

[0039] Fig.13 A schematic structural diagram of a first insulating member in some embodiments of the present application;

[0040] Fig.14 Schematic diagram of the assembly of the pole conduction structure and various insulating components according to some embodiments of the present application.

[0041] Description of reference numerals:

[0042] 100. Electrochemical device;

[0043] 10. Accommodation portion; 11. Accommodation cavity; 12. Mounting hole; 13. Inner surface; 14. Outer surface;

[0044] 20, first insulating member; 21, first through hole; 20a, first sub-insulating member; 20b, second sub-insulating member; 20c, third sub-insulating member;

[0045] 30, second insulating member; 31, second through hole; 30a, fourth sub-insulating member; 30b, fifth sub-insulating member; 30c, sixth sub-insulating member;

[0046] 40. first feedthrough; 41. first plug hole; 42. first surface;

[0047] 50. second feedthrough; 51. second plug hole; 52. second surface;

[0048] 60, third feed-through; 61, first end; 62, second end; 63, first portion; 64, first section; 641, first plug-in position; 65, second section; 651, first plug-in member;

[0049] X, first direction; Z, second direction; Z-, negative direction of the second direction. DETAILED DESCRIPTION

[0050] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements.

[0051] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0052] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. In addition, the technical features involved in the different embodiments of the present application described below may be combined with each other as long as they do not conflict with each other.

[0053] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0054] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0055] In the first aspect, the present application proposes an electrochemical device 100, please refer to Figure 1 and Figure 2The electrochemical device 100 includes a receiving portion 10, a first insulating member 20, a second insulating member 30, and a first feedthrough 40, a second feedthrough 50, and a third feedthrough 60 electrically connected to each other.

[0056] For the above-mentioned accommodation portion 10, please refer to Figure 2 and Figure 3 The receiving portion 10 encloses a receiving cavity 11, and the electrochemical device 100 further includes an electrode assembly (not shown in the figure) and an electrolyte (not shown in the figure), and both the electrode assembly and the electrolyte can be accommodated in the receiving cavity 11. In some embodiments, the receiving portion 10 is provided with a mounting hole 12 that penetrates the inner surface 13 and the outer surface 14 of the receiving portion 10, so that the mounting hole 12 is connected to the receiving cavity 11, and the above-mentioned feedthroughs can be arranged in the mounting hole 12 and lead out the positive electrode or the negative electrode of the electrode assembly.

[0057] Optionally, the receiving portion 10 may be formed by punching a layer of metal sheet, and the thickness of the metal sheet may be set to 0.1 to 0.4 mm to ensure the punching strength of the receiving portion 10. The metal sheet may be made of conductive metal materials such as aluminum, steel, stainless steel, nickel, copper or magnesium alloy, so that the receiving portion 10 can lead out a certain polarity of the electrochemical device 100. For example, the above-mentioned feedthroughs lead out the positive electrode, and the receiving portion 10 leads out the negative electrode; in some other embodiments, the above-mentioned feedthroughs may also lead out the negative electrode, and the receiving portion 10 leads out the positive electrode.

[0058] Since the polarities of the receiving portion 10 and the feedthroughs are opposite, in order to prevent a short circuit between the receiving portion 10 and the feedthroughs, a first insulating member 20 and a second insulating member 30 are provided in the present application.

[0059] For the first insulating member 20, please refer to Figure 2 and Figure 3 The first insulating member 20 can be disposed in the accommodating cavity 11, and the first insulating member 20 is attached to the inner surface 13 of the accommodating portion 10, and the first insulating member 20 is used to separate and insulate the first feedthrough 40 from the accommodating portion 10. The first insulating member 20 is provided with a first through hole 21, which is communicated with the mounting hole 12 of the accommodating portion 10, and the first through hole 21 can be provided for the third feedthrough 60 to pass through, so as to facilitate the electrical connection between the third feedthrough 60 and the first feedthrough 40.

[0060] For the second insulating member 30, please refer to Figure 2 and Figure 3The second insulating member 30 can be disposed outside the accommodating portion 10, and the second insulating member 30 is attached to the outer surface 14 of the accommodating portion 10, and the second insulating member 30 is used to separate and insulate the second feedthrough 50 from the accommodating portion 10. The second insulating member 30 is provided with a second through hole 31, which is communicated with the mounting hole 12 of the accommodating portion 10, and the second through hole 31 can also be provided for the third feedthrough 60 to pass through, so as to facilitate the electrical connection between the third feedthrough 60 and the second feedthrough 50.

[0061] For the first feedthrough 40, please refer to Figure 2 and Figure 3 The first feedthrough 40 is located in the accommodating cavity 11, and the first feedthrough 40 is attached to the end surface of the first insulating member 20 that is away from the second insulating member 30, and the first insulating member 20 separates and insulates the first feedthrough 40 from the accommodating portion 10. The first feedthrough 40 can be made of a conductive metal material such as aluminum, nickel, copper, etc. The electrode assembly is electrically connected to the first feedthrough 40, so that the first feedthrough 40 can lead to a certain polarity (positive or negative) of the electrode assembly.

[0062] For the second feedthrough 50, please continue to refer to Figure 2 and Figure 3 The second feedthrough 50 is located outside the accommodating portion 10, and the second feedthrough 50 is attached to the end surface of the second insulating member 30 that is away from the first insulating member 20, and the second insulating member 30 separates and insulates the second feedthrough 50 from the accommodating portion 10. The second feedthrough 50 can also be made of a conductive metal material such as aluminum, nickel, copper, etc. The second feedthrough 50 can be electrically connected to the first feedthrough 40 through the third feedthrough 60, so that the second feedthrough 50 leads to a certain polarity of the electrode assembly.

[0063] For the third feedthrough 60, please refer to Figure 2 and Figure 3 The third feedthrough 60 is arranged in the first through hole 21, the mounting hole 12 and the second through hole 31. The second feedthrough 50 can also be made of a conductive metal material such as aluminum, nickel, copper, etc. The second feedthrough 50 is electrically connected between the first feedthrough 40 and the second feedthrough 50, so that the first feedthrough 40, the second feedthrough 50 and the third feedthrough 60 form a pole conduction structure, and the electrode assembly can be connected to the external circuit through the pole conduction structure.

[0064] In the embodiment of the present application, since the first feedthrough 40 is fitted and connected to the end face of the first insulating member 20 facing away from the second insulating member 30, and the second feedthrough 50 is fitted and connected to the end face of the second insulating member 30 facing away from the first insulating member 20, by relatively crimping the first feedthrough 40 and the second feedthrough 50, the first insulating member 20 can be stably bonded between the first feedthrough 40 and the accommodating portion 10, and the second insulating member 30 can be stably bonded between the second feedthrough 50 and the accommodating portion 10. The sealing structure of the inner and outer double-layer insulating members increases the effective sealing area and ensures the reliability of the seal. Compared with the traditional physical riveting method, relatively crimping the two insulating members makes it easier for the two insulating members to fill the surface micropores of the accommodating portion 10 and the pole conductive structure, which is beneficial to improving the waterproof effect of the electrochemical device 100.

[0065] At the same time, the structure of the two insulating parts being crimped relative to each other has little effect on the third feed-through 60 (i.e., the pole shaft portion), and the third feed-through 60 does not need to be riveted to bear force, which can alleviate the deformation and deflection of the third feed-through 60, which is not only beneficial to improving the sealing of the electrochemical device 100, but also can reduce the short circuit risk of the electrochemical device 100; secondly, the diameter of the third feed-through 60 (or the cross-sectional area perpendicular to its axial direction) can also be set to be smaller, so as to meet the miniaturization or thinning design requirements of the electrochemical device 100.

[0066] Optionally, the first insulating member 20 and the second insulating member 30 may be bonded between the accommodating portion 10 and the above-mentioned pole conduction structure by hot pressing. The first insulating member 20 and the second insulating member 30 are heated to a molten state, and then the first feedthrough 40 and the second feedthrough 50 are crimped relative to each other. When the first feedthrough 40 and the second feedthrough 50 are both in contact with the third feedthrough 60, it indicates that the first insulating member 20 and the second insulating member 30 have been crimped to a predetermined position. The first insulating member 20 and the second insulating member 30 in a molten state have better fluidity and more complete diffusion, and can more easily and evenly fill the surface micropores of the accommodating portion 10 and the pole conduction structure, and have better sealing performance.

[0067] In some embodiments, please refer to Figure 4 and Figure 5, the first insulating member 20 and / or the second insulating member 30 extend in the mounting hole 12. The first insulating member 20 may extend in the mounting hole 12 and connect to the second insulating member 30 on the outer surface 14; or, the second insulating member 30 may extend in the mounting hole 12 and connect to the first insulating member 20 on the inner surface 13; or, both the first insulating member 20 and the second insulating member 30 extend in the mounting hole 12, and the first insulating member 20 and the second insulating member 30 are connected in the mounting hole 12. In this embodiment, the first insulating member 20 and / or the second insulating member 30 may insulate and separate the third feedthrough 60 from the accommodating portion 10 in the mounting hole 12, and the first insulating member 20 and / or the second insulating member 30 may fill the gap between the inner wall of the mounting hole 12 and the third feedthrough 60, which can not only further improve the sealing performance, but also further reduce the short circuit risk of the electrochemical device 100.

[0068] Please refer to Figure 4 and Figure 6 , a first plug hole 41 is provided on the first feed-through 40, and the first plug hole 41 is communicated with the first through hole 21. A second plug hole 51 is provided on the second feed-through 50, and the second plug hole 51 is communicated with the second through hole 31. The third feed-through 60 includes a first end 61 and a second end 62 that are arranged opposite to each other. When the first feed-through 40 and the second feed-through 50 are crimped relative to each other, the first end 61 can be plugged into the first plug hole 41, and the first end 61 is electrically connected to the first feed-through 40 in the first plug hole 41; the second end 62 can be plugged into the second plug hole 51, and the second end 62 is electrically connected to the second feed-through 50 in the second plug hole 51, so that the positioning and crimping of the first feed-through 40 and the second feed-through 50 can be facilitated.

[0069] In addition, the first end 61 can pass through the first plug hole 41, and the second end 62 can also pass through the second plug hole 51, which makes the adjustable range of the crimping distance between the first feedthrough 40 and the second feedthrough 50 larger to meet various crimping requirements. For example, when the first feedthrough 40 and the second feedthrough 50 are relatively crimped and just abut against the third feedthrough 60, the first insulating member 20 and the second insulating member 30 are not ideal for filling the above-mentioned surface micropores. At this time, the first feedthrough 40 and the second feedthrough 50 can be relatively crimped again until the surface micropores are directly filled.

[0070] Optional, see Figure 6, the first feed-through 40 has a first surface 42 facing away from the second feed-through 50. When the first feed-through 40 and the second feed-through 50 are pressed against each other and the first insulating member 20 and the second insulating member 30 fill the above-mentioned surface micropores, the first end 61 is flush with the first surface 42. In this embodiment, by arranging the first end 61 flush with the first surface 42, it is convenient to connect the first end 61 with the first feed-through 40, and the connection method can be conductive adhesive bonding or welding, etc.; at the same time, it can also increase the contact area between the pole conductive structure and the electrode assembly to facilitate the electrical connection with the electrode assembly.

[0071] In some other embodiments, please continue to refer to Figure 6 , the second feedthrough 50 has a second surface 52 facing away from the first feedthrough 40. When the first feedthrough 40 and the second feedthrough 50 are relatively crimped and the first insulating member 20 and the second insulating member 30 fill the above-mentioned surface micropores, the second end 62 is flush with the second surface 52. This structure can facilitate the welding of the second end 62 and the second feedthrough 50, and at the same time, it can also increase the contact area between the pole conduction structure and the external circuit, so as to facilitate the transfer welding with the external circuit, improve the welding tension, and ensure the welding stability. In addition, since the second end 62 is flush with the second surface 52 and has no protruding structure, the height of the pole conduction structure can be minimized to meet the requirements of miniaturization of the electrochemical device.

[0072] In some embodiments, please refer to Figure 7 , the third feed-through 60 further includes a first portion 63 connected between the first end 61 and the second end 62. The cross-sectional area of ​​the first end 61 and the cross-sectional area of ​​the second end 62 are both smaller than the cross-sectional area of ​​the first portion 63. The cross-sectional area is a cross-sectional area of ​​the first end 61, the second end 62 or the first portion 63 in a direction perpendicular to the first end 61 to the second end 62 (i.e., the second direction Z).

[0073] The size of the first plug hole 41 can be set to match the first end 61, and the size of the second plug hole 51 can also be set to match the second end 62. When the first feedthrough 40 and the second feedthrough 50 are relatively crimped, and the first insulating member 20 and the second insulating member 30 fill the above-mentioned surface micropores, the first end 61 is plugged into the first plug hole 41, and the second end 62 is plugged into the second plug hole 51. Since the cross-section of the first part 63 is larger, this will cause the first part 63 to abut between the first feedthrough 40 and the second feedthrough 50 to limit the relative crimping of the first feedthrough 40 and the second feedthrough 50, which means that the first feedthrough 40 and the second feedthrough 50 have been crimped to the specified position (that is, the first insulating member 20 and the second insulating member 30 fill the surface micropores). This structure can facilitate the user to relatively crimp the first feedthrough 40 and the second feedthrough 50, and can reduce the risk of damage to the first insulating member 20 and the second insulating member 30 due to excessive crimping.

[0074] Optionally, when the first portion 63 abuts between the first feedthrough 40 and the second feedthrough 50, the first end 61 is flush with the first surface 42, and the second end 62 is flush with the second surface 52. The abutment of the first portion 63 facilitates the crimping and positioning of the first feedthrough 40 and the second feedthrough 50.

[0075] In some embodiments, please refer to Figure 8 , the first feed-through 40 and the third feed-through 60 are integrally formed. This structure does not require the first plug-in hole 41 to be opened on the first feed-through 40, and the plug-in step of the third feed-through 60 and the first feed-through 40 is omitted, which can improve the overall strength of the first feed-through 40 and the third feed-through 60, and further reduce the risk of deformation and tilting of the third feed-through 60. When the first feed-through 40 and the second feed-through 50 are crimped, the third feed-through 60 will only penetrate into the second plug-in hole 51 of the second feed-through 50, and it is only necessary to firmly connect the third feed-through 60 and the second feed-through 50, and the connection methods include but are not limited to conductive adhesive connection, welding or clamping, etc.

[0076] In some other embodiments, please refer to Fig. 9 The second feed-through 50 and the third feed-through 60 are integrally formed. This structure does not require the second plug-in hole 51 to be opened on the second feed-through 50, thereby eliminating the plug-in step of the third feed-through 60 and the second feed-through 50, thereby improving the overall strength of the second feed-through 50 and the third feed-through 60 and reducing the risk of deformation and tilting of the third feed-through 60.

[0077] In some embodiments, the third feedthrough 60 may be a split type. Fig.10, the third feed-through 60 includes a first section 64 close to the first feed-through 40 and a second section 65 close to the second feed-through 50, and the first section 64 and the second section 65 are electrically connected to each other. The first section 64 is integrally formed with the first feed-through 40 (in this case, the first section 64 can also be considered as a part of the first feed-through 40), and the second section 65 is integrally formed with the second feed-through 50 (in this case, the second section 65 can also be considered as a part of the second feed-through 50). In this embodiment, no plug-in holes are provided in the first feed-through 40 and the second feed-through 50, which can reduce the corresponding hole-opening steps and reduce the production cost. When the first section 64 and the second section 65 abut against each other, it indicates that the first feed-through 40 and the second feed-through 50 are crimped.

[0078] In some other embodiments, please refer to Fig.11 , a first plug-in position 641 is provided on the end surface of the first section 64 facing the second section 65, and a first connector 651 is provided on one end of the second section 65 facing the first plug-in position 641, the first connector 651 is adapted to the first plug-in position 641, and the first connector 651 is used to be plugged into the first plug-in position 641. When the first connector 651 is fully plugged into the first plug-in position 641, it indicates that the first feed-through 40 and the second feed-through 50 are crimped. In this embodiment, by providing the first connector 651 and the first plug-in position 641, the positioning connection between the first section 64 and the second section 65 can be facilitated, and at the same time, due to the restrictions of the first plug-in position 641 and the first connector 651, the relative movement between the first section 64 and the second section 65 can be reduced to ensure the stability of the overall structure. It is understandable that the positions of the first connector 651 and the first connector position 641 can also be interchanged, that is, the first connector 651 is disposed in the first section 64, and the first connector position 641 is disposed in the second section.

[0079] Optionally, when crimping the first feedthrough 40 and the second feedthrough 50, a conductive glue or other adhesive may be provided on the end surface of the first section 64 facing the second section 65 to ensure a stable connection between the first section 64 and the second section 65. Similarly, a conductive glue or other adhesive may be provided on the end surface of the second section 65 facing the first section 64.

[0080] In some embodiments, the first insulating member 20 and the second insulating member 30 can melt when the temperature rises to a first threshold value, and can generate a pressure relief channel connecting the accommodating cavity 11 and the outside of the accommodating portion 10 under the action of the gas pressure in the accommodating cavity 11 .

[0081] Under normal working conditions (i.e., the electrochemical device 100 works normally), the first insulating member 20 and the second insulating member 30 can realize the sealing and insulating function. When the electrochemical device 100 has thermal runaway, that is, when the temperature in the accommodating chamber 11 rises to the first threshold value, the gas in the accommodating chamber 11 expands due to heat and the accommodating chamber 11 continuously generates gas, and the first insulating member 20 and the second insulating member 30 melt and generate a pressure relief channel connecting the accommodating chamber 11 and the outside under the action of the gas pressure in the accommodating chamber 11, so as to reduce the gas pressure in the accommodating chamber 11, which can effectively prevent the electrochemical device 100 from exploding due to thermal runaway. Compared with the traditional pressure relief groove or pressure relief hole structure, the pressure relief structure in this embodiment does not require additional laser drilling and other operations, and the manufacturing process is simple, which is convenient for improving the production efficiency of the electrochemical device 100; at the same time, the first insulating member 20 and the second insulating member 30 have both insulation and pressure relief functions, reducing components such as pressure relief valves, which not only reduces material costs, but also helps to improve the energy density of the electrochemical device 100.

[0082] Optional, see Fig.12 and Fig.13 The first insulating member 20 includes a first sub-insulating member 20a, a second sub-insulating member 20b and a third sub-insulating member 20c, which are stacked along the first direction X. The first through hole 21 penetrates the first sub-insulating member 20a, the second sub-insulating member 20b and the third sub-insulating member 20c. The second sub-insulating member 20b is connected between the first sub-insulating member 20a and the third sub-insulating member 20c, the first sub-insulating member 20a is connected to the first feed-through member 40, and the third sub-insulating member 20c is connected to the accommodating portion 10.

[0083] The melting points of the first sub-insulator 20a and the third sub-insulator 20c are less than or equal to the first threshold value, that is, when the temperature reaches the first threshold value, the first sub-insulator 20a and the third sub-insulator 20c melt to generate a pressure relief channel to quickly discharge the gas. The melting point of the second sub-insulator 20b is greater than the first threshold value, that is, the second sub-insulator 20b still maintains a fixed shape at this time, and the second sub-insulator 20b still adheres to the first sub-insulator 20a and the third sub-insulator 20c in a hot-melt state to improve the overall strength of the first insulating member 20, thereby improving the stability of the bonding between the accommodating portion 10 and the pole conduction structure, and can reduce the hot melt overflow of the first sub-insulator 20a and the third sub-insulator 20c. At the same time, the low-melting-point first sub-insulator 20a and the third sub-insulator 20c make it easier to achieve the melting and pressing of the first insulating member 20 between the first feedthrough 40 and the accommodating portion 10, so as to fill the surface micropores of the first feedthrough 40 and the accommodating portion 10.

[0084] Furthermore, the melting points of the first sub-insulator 20a and the third sub-insulator 20c are 100° C. to 130° C., and the melting point of the second sub-insulator 20b is 140° C. to 190° C. The materials of the first sub-insulator 20a, the second sub-insulator 20b and the third sub-insulator 20c can be selected from PP, LDPE, HDPE, LLDPE, OPP, PS, PVC, PET, PA or PF, for example, the first sub-insulator 20a and the third sub-insulator 20c are made of low melting point PP (melting point 100° C. to 130° C.), and the second sub-insulator 20b is made of high melting point PP (melting point 140° C. to 190° C.).

[0085] Optionally, along the stacking direction (first direction X) of the first sub-insulator 20a, the second sub-insulator 20b and the third sub-insulator 20c, the overall thickness of the first insulating member 20 can be set to 0.05mm to 1mm, preferably 0.1mm to 0.3mm; wherein the thickness of the second sub-insulator 20b is 50% to 300% of the thickness of the first sub-insulator 20a, and the thickness of the second sub-insulator 20b is 50% to 300% of the thickness of the third sub-insulator 20c. When the thickness of the second sub-insulator 20b is greater, the overall strength of the first insulating member 20 can be greater; and when the thickness of the first sub-insulator 20a and the third sub-insulator 20c is greater, it is easier to form a pressure relief channel to facilitate the discharge of gas.

[0086] The structure of the second insulating member 30 is similar to that of the first insulating member 20. Fig.12 The second insulating member 30 includes a fourth sub-insulator 30a, a fifth sub-insulator 30b and a sixth sub-insulator 30c which are stacked, and the second through hole 31 passes through the fourth sub-insulator 30a, the fifth sub-insulator 30b and the sixth sub-insulator 30c. The fifth sub-insulator 30b is connected between the fourth sub-insulator 30a and the sixth sub-insulator 30c, the fourth sub-insulator 30a is connected to the accommodating portion 10, and the sixth sub-insulator 30c is connected to the second feed-through 50. The melting points of the fourth sub-insulator 30a and the sixth sub-insulator 30c are less than or equal to the first threshold, and the melting point of the fifth sub-insulator 30b is greater than the first threshold. In this way, when the temperature rises to the first threshold value, the first sub-insulator 20a, the third sub-insulator 20c, the fourth sub-insulator 30a and the sixth sub-insulator 30c all melt to produce a pressure relief channel, while the second sub-insulator 20b and the fifth sub-insulator 30b remain in a solid state to ensure the structural stability of each insulating component and reduce the amount of glue overflow.

[0087] It can be understood that when neither the first insulating member 20 nor the second insulating member 30 extends into the mounting hole 12, the pressure relief passage is the first insulating member 20, the mounting hole 12, and the second insulating member 30. When the first insulating member 20 and / or the second insulating member 30 extends into the mounting hole 12, the first sub-insulator 20a is at least partially connected to the sixth sub-insulator 30c, and the third sub-insulator 20c is at least partially connected to the fourth sub-insulator 30a. When the first sub-insulator 20a, the sixth sub-insulator 30c, the third sub-insulator 20c, and the fourth sub-insulator 30a are melted, the pressure relief through hole of the first insulating member 20 can be connected to the pressure relief passage of the second insulating member 30, so as to quickly discharge the gas.

[0088] In some embodiments, please refer to Fig.14 , along the direction from the third feedthrough 60 to the first insulating member 20 (for example, with the third feedthrough 60 as the origin, along the second direction Z or along the negative direction Z- of the second direction), the connection width between the first insulating member 20 and the first feedthrough 40 is W1, satisfying 0.2mm≤W1≤2mm; in this embodiment, the first insulating member 20 can be set to be annular, Fig.14 In the figure, the first insulating member 20 and the first feed-through member 40 have an upper connecting portion A and a lower connecting portion B. When along the second direction Z, the connection width W1 here is the upper connecting portion A; when along the negative direction Z- of the second direction, the connection width W1 here is the lower connecting portion B.

[0089] It should be noted that any direction parallel to and pointing in the same direction as the second direction Z can be regarded as the second direction Z, and the same applies to other directions. In addition, in this embodiment, the second direction Z or the negative direction Z- of the second direction is taken as an example. Since the first insulating member 20 is annular, there are countless directions from the third feedthrough member 60 to the first insulating member 20, from the inner ring of the first insulating member 20 to the outer ring of the first insulating member 20 (i.e., the ring width direction).

[0090] In some other embodiments, along the direction from the third feedthrough 60 to the second insulating member 30 (for example, with the third feedthrough 60 as the origin, along the second direction Z or along the negative direction Z- of the second direction), the connection width between the second insulating member 30 and the second feedthrough 50 is W2, satisfying 0.2mm≤W2≤2mm. This design can shorten the length of the thermal runaway pressure relief path of the electrochemical device, improve the pressure relief sensitivity of the electrochemical device, and ensure the sealing reliability.

[0091] Furthermore, along the direction from the third feedthrough 60 to the first insulating member 20, the connection width between the first insulating member 20 and the first feedthrough 40 is W1, satisfying 0.3mm≤W1≤1mm; and / or, along the direction from the third feedthrough 60 to the second insulating member 30, the connection width between the second insulating member 30 and the second feedthrough 50 is W2, satisfying 0.3mm≤W2≤1mm.

[0092] In the second aspect, the embodiments of the present application also propose an electronic device, including the electrochemical device 100 described in any of the above embodiments. The electronic device of the embodiments of the present application is not particularly limited, and it can be any electronic device known in the prior art. For example, electronic devices include but are not limited to Bluetooth headsets, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0093] It should be noted that the preferred embodiments of the present application are given in the specification and drawings of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described in the specification. These embodiments are not used as additional limitations on the content of the present application. The purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. In addition, the above-mentioned technical features continue to be combined with each other to form various embodiments not listed above, which are all regarded as the scope of the description of the present application; further, for ordinary technicians in this field, they can be improved or transformed according to the above description, and all these improvements and transformations should belong to the scope of protection of the claims attached to the present application.

Claims

1. An electrochemical device, comprising a housing portion enclosing a housing cavity, wherein the housing portion is provided with a mounting hole penetrating the inner surface and the outer surface of the housing portion, wherein: The electrochemical device further comprises: A first insulating member, attached to the inner surface, the first insulating member is provided with a first through hole communicating with the mounting hole; A second insulating member, attached to the outer surface, the second insulating member is provided with a second through hole communicating with the mounting hole; A first feed-through member, being closely connected to an end surface of the first insulating member that faces away from the second insulating member; A second feed-through member, being closely connected to an end surface of the second insulating member that faces away from the first insulating member; The third feedthrough is disposed in the first through hole, the mounting hole and the second through hole, and the third feedthrough is electrically connected between the first feedthrough and the second feedthrough.

2. The electrochemical device according to claim 1, characterized in that The first insulating member and the second insulating member can melt when the temperature rises to a first threshold value, and can generate a pressure relief channel communicating between the accommodating cavity and the outside of the accommodating portion under the action of the gas pressure in the accommodating cavity.

3. The electrochemical device according to claim 2, characterized in that The first insulating member includes a first sub-insulating member, a second sub-insulating member and a third sub-insulating member; the second sub-insulating member is connected between the first sub-insulating member and the third sub-insulating member, the first sub-insulating member is connected to the first feed-through member, and the third sub-insulating member is connected to the accommodating portion; the melting points of the first sub-insulating member and the third sub-insulating member are less than or equal to the first threshold value, and the melting point of the second insulating member is greater than the first threshold value; The second insulating member includes a fourth sub-insulator, a fifth sub-insulator and a sixth sub-insulator; the fifth sub-insulator is connected between the fourth sub-insulator and the sixth sub-insulator, the fourth sub-insulator is connected to the accommodating portion, and the sixth sub-insulator is connected to the second feed-through; the melting points of the fourth sub-insulator and the sixth sub-insulator are less than or equal to the first threshold value, and the melting point of the fifth sub-insulator is greater than the first threshold value.

4. The electrochemical device according to claim 1, characterized in that Along the direction from the third feedthrough to the first insulating member, the connection width between the first insulating member and the first feedthrough is W1, satisfying 0.2mm≤W1≤2mm; and / or, along the direction from the third feedthrough to the second insulating member, the connection width between the second insulating member and the second feedthrough is W2, satisfying 0.2mm≤W2≤2mm.

5. The electrochemical device according to claim 4, characterized in that Along the direction from the third feedthrough to the first insulating member, the connection width between the first insulating member and the first feedthrough is W1, satisfying 0.3mm≤W1≤1mm; and / or, along the direction from the third feedthrough to the second insulating member, the connection width between the second insulating member and the second feedthrough is W2, satisfying 0.3mm≤W2≤1mm.

6. The electrochemical device according to claim 1, characterized in that The first insulating member and / or the second insulating member extends from the mounting hole.

7. The electrochemical device according to claim 1, characterized in that A first plug hole is formed on the first feed-through member, and the first plug hole is communicated with the first through hole; The second feed-through member is provided with a second plugging hole, and the second plugging hole is communicated with the second through hole; The third feedthrough comprises a first end and a second end that are arranged opposite to each other; The first end is plugged into the first plug hole and electrically connected to the first feed-through member in the first plug hole; The second end portion is plugged into the second plug hole and electrically connected to the second feed-through member in the second plug hole.

8. The electrochemical device according to claim 7, characterized in that The first feedthrough has a first surface facing away from the second feedthrough, and the first end is flush with the first surface; and / or, The second feedthrough has a second surface facing away from the first feedthrough, and the second end is flush with the second surface.

9. The electrochemical device according to claim 7, characterized in that: The third feedthrough also includes a first portion connected between the first end and the second end; The cross-sectional area of ​​the first end and the cross-sectional area of ​​the second end are both smaller than the cross-sectional area of ​​the first portion; The cross section is a cross section of the first end, the second end or the first part in a direction perpendicular to the first end to the second end.

10. The electrochemical device according to claim 1, characterized in that The first feedthrough and the third feedthrough are integrally formed, or the second feedthrough and the third feedthrough are integrally formed.

11. The electrochemical device according to claim 1, characterized in that: The third feedthrough comprises a first section close to the first feedthrough and a second section close to the second feedthrough, the first section and the second section being electrically connected to each other; The first section is integrally formed with the first feedthrough, and the second section is integrally formed with the second feedthrough.

12. The electrochemical device according to claim 11, characterized in that The end surface of the first section facing the second section is provided with a first plugging position, and the end of the second section facing the first plugging position is provided with a first connector, the first connector is adapted to the first connector, and the first connector is used to be plugged into the first plugging position.

13. An electronic device, characterized in that: Comprising the electrochemical device according to any one of claims 1 to 12.

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