Electrochemical apparatus, electric device, and preparation method for electrochemical apparatus

Abstract

An electrochemical apparatus (10), comprising a housing (100), an electrode assembly (200), a terminal post (300), and a first connector (400). A first section (410) of the first connector (400) is connected to a first tab (220) of the electrode assembly (200), and a second section (420) of the first connector (400) is connected to the terminal post (300); when observed in a first direction (X), the first section (410) and the second section (420) do not overlap. The housing (100) comprises a first side wall (110) and a second side wall (120) which are connected to each other. The shortest distance from the center of the terminal post (300) to the end face of the first connector (400) in a second direction (Y) is L1, the distance from the center of the terminal post (300) to a bottom wall (150) of the housing (100) is L2, and the distance from the center of the terminal post (300) to a second side wall (120) is L3, satisfying L1≤L2, and L1≤L3.

Description

Electrochemical device, electrical equipment, and method for preparing electrochemical device Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an electrochemical device, an electrical equipment, and a method for preparing the electrochemical device. Background Art

[0002] With the rapid development of new energy technologies, batteries have been widely used in electronic equipment, electric vehicles, electric two-wheeled vehicles, power tools and other fields, and the requirements for battery energy density are becoming increasingly higher.

[0003] Currently, electrochemical devices are typically equipped with connectors for connecting electrode assemblies and terminals. During assembly, the connections between the connectors, the electrode assemblies, and the terminals are complex, impacting assembly difficulty and manufacturing efficiency.

[0004] Summary of the Invention

[0005] The present application provides an electrochemical device, electrical equipment, and a method for preparing the electrochemical device, which can reduce the difficulty of assembling the electrochemical device.

[0006] An electrochemical device comprising:

[0007] The housing is formed with an accommodating space, and a first through hole is provided on a first side wall of the housing;

[0008] An electrode assembly is accommodated in the accommodation space, and the electrode assembly includes a main body and a first electrode tab, wherein the first electrode tab is arranged on a side of the main body close to the first side wall;

[0009] A pole, disposed through the first through hole;

[0010] a first connecting member disposed in the accommodating space, the first connecting member comprising a first section and a second section, the first section being connected to the first tab, the second section being connected to the electrode post, the first section and the second section not overlapping when viewed along a first direction, the first direction being parallel to an arrangement direction of the electrode assembly and the first sidewall;

[0011] In which, the shell also includes a second side wall, the second side wall is connected to the first side wall, the first connecting member includes a first end face and a second end face arranged opposite to each other along the length direction, the distance from the first end face to the center of the pole is less than the distance from the second end face to the center of the pole, the distance from the center of the pole to the first end face along the second direction is L1, the distance from the center of the pole to the bottom wall of the shell is L2, and the distance from the center of the pole to the second side wall is L3, satisfying L1≤L2, L1≤L3.

[0012] In the above technical solution, the electrochemical device includes a shell, an electrode assembly, a pole and a first connecting member. The shell forms an accommodating space, which can be used to accommodate the electrode assembly and the first connecting member, and plays a protective role for the electrode assembly and the first connecting member; a first through hole is provided on the first side wall of the shell, and the pole is provided through the first through hole. The electrode assembly includes a main body and a first pole ear, and the first pole ear is provided on the side of the main body close to the first side wall. The first connecting member includes a first section and a second section. The first section is connected to the first pole ear, and the second section is connected to the pole, so that the main body can be electrically connected to other devices through the first pole ear, the first connecting member and the pole; when viewed along the first direction, the first section and the second section do not overlap, and the first direction is parallel to the arrangement direction of the electrode assembly and the first side wall, so that the first connecting member can be sized in the first direction. The size is small, the first connecting member occupies less space in the accommodating space, and the accommodating space can have more space for accommodating the electrode assembly, which can make the volume of the electrode assembly larger, thereby improving the energy density of the electrochemical device; the distance L1 from the center of the pole to the first end face along the second direction, the distance L2 from the center of the pole to the bottom wall of the shell, and the distance L3 from the center of the pole to the second side wall satisfy L1≤L2, L1≤L3, so that after the first connecting member is connected to the electrode assembly and the pole, the electrode assembly and the pole are rotated together into the accommodating space, and the first connecting member is not likely to interfere with the shell, so that the assembly process of the electrochemical device is smooth, and this assembly method can simplify the assembly process of the electrochemical device, reduce the difficulty of assembling the electrochemical device, and improve the preparation efficiency of the electrochemical device.

[0013] In some embodiments, the thickness of the shell is H, satisfying 1 / 2*H≤L2≤H.

[0014] In the above technical solution, by ensuring that the thickness H of the shell and the distance L2 from the center of the pole to the bottom wall of the shell satisfy 1 / 2*H≤L2≤H, the center of the pole can be made farther away from the bottom wall of the shell, so that the length of the first connector from the center of the pole to the portion of the first connector close to the first end face of the pole can be set to be larger, thereby facilitating the connection between the first connector and the pole, and reserving a larger space for the rotation of the first connector relative to the shell, thereby reducing the possibility of interference between the first connector and the shell.

[0015] In some embodiments, the distance L2 from the center of the pole to the bottom wall of the housing and the distance L3 from the center of the pole to the second side wall also satisfy L2 = L3. It should be noted that tolerances may occur during the process, and a tolerance range within 0.5 mm is normal.

[0016] In the above technical solution, by ensuring that the distance L2 from the center of the electrode to the bottom wall of the housing and the distance L3 from the center of the electrode to the second side wall also satisfy L2=L3, the first connector can be easily rotated relative to the housing, is less likely to interfere with the housing, and can also increase the energy density of the electrochemical device. If L2<L3, due to L1≤L2, after the first connector is accommodated in the accommodation space, the end surface of the first connector connected to the electrode and the second side wall is separated by a large distance. After the first connector and the electrode assembly are rotated relative to the housing and placed in the accommodation space, a large gap may exist between the electrode assembly and the second side wall, resulting in a portion of the accommodation space being vacant and wasted, affecting the energy density of the electrochemical device. If L2>L3, due to L1≤L2, L1 may be larger than L3, causing the first connector to interfere with the second side wall during the rotation relative to the housing, making it difficult for the first connector and the electrode assembly to be inserted into the housing.

[0017] In some embodiments, the distance L3 from the center of the pole to the second side wall satisfies 3 mm ≤ X ≤ 15 mm.

[0018] In the above technical solution, by ensuring that the distance L3 from the center of the electrode to the second side wall satisfies 3mm≤L3≤15mm, sufficient space is reserved between the center of the electrode and the second side wall for the first connector to rotate, and the energy density of the electrochemical device can be increased. If L3 is too large, after the first connector and the electrode assembly are rotated relative to the housing and placed into the accommodating space, a large gap may exist between the electrode assembly and the second side wall, resulting in a portion of the accommodating space being vacant and wasted, affecting the energy density of the electrochemical device. If L3 is too small, the space reserved from the center of the electrode to the second side wall is small, and the first connector may interfere with the second side wall during rotation relative to the housing, making it difficult for the first connector and the electrode assembly to enter the housing, or the length of the first connector from the center of the electrode to the end face of the first connector close to the electrode is short, making it inconvenient to connect the first connector to the electrode.

[0019] In some embodiments, a distance S between the main body and the first side wall satisfies 1.9 mm ≤ S ≤ 2.05 mm.

[0020] In the above technical solution, by ensuring that the spacing S between the main body and the first sidewall satisfies 1.9 mm ≤ S ≤ 2.05 mm, sufficient space is provided between the main body and the first sidewall to accommodate the first tab, the first connector, and a portion of the electrode post. This reduces the likelihood of the first connector and the electrode post shorting with the main body. Furthermore, the reduced spacing between the main body and the first sidewall allows more space for the electrode assembly, increasing the volume of the electrode assembly and thereby improving the energy density of the electrochemical device. In some embodiments, the first connector further includes a third segment, which connects the first segment and the second segment, with the first segment and the second segment extending in opposite directions from respective ends of the third segment.

[0021] In the above technical solution, the first connecting member also includes a third section, which connects the first section and the second section. The first section and the second section extend in opposite directions from the two ends of the third section, respectively, so that the first section can be fitted and connected with the first electrode ear, and the second section can be fitted and connected with the electrode column. In addition, the first connecting member does not need to be bent during the assembly process, which reduces the safety risk of internal short circuit of the electrochemical device caused by bending of the first connecting member and simplifies the process of inserting the electrode assembly into the shell.

[0022] In some embodiments, the first segment is disposed at an angle to the third segment, and the second segment is disposed at an angle to the third segment.

[0023] In the above technical solution, since the connection surface between the first electrode tab and the first section and the connection surface between the electrode column and the second section are not on the same plane, by setting the first section and the third section at an angle, and the second section and the third section at an angle, it is convenient to connect the first section with the first electrode tab, and to connect the second section with the electrode column, and the spacing distance between the main body and the first side wall can be made smaller, and the accommodating space can have more space for accommodating the electrode assembly, which can make the volume of the electrode assembly larger, thereby improving the energy density of the electrochemical device.

[0024] In some embodiments, the angle between the first segment and the third segment is α, the angle between the second segment and the third segment is β, and 45°≤α≤90°, 45°≤β≤90° is satisfied.

[0025] In the above technical solution, by making the angle α between the first segment and the third segment and the angle β between the second segment and the third segment satisfy 45°≤α≤90° and 45°≤β≤90°, it can further facilitate the connection between the first segment and the first tab and further facilitate the connection between the second segment and the pole.

[0026] In some embodiments, the third section protrudes from the second section toward the first sidewall.

[0027] In the above technical solution, since the connection surface between the first electrode tab and the first section is closer to the first side wall than the connection surface between the electrode post and the second section, by making the third section protrude from the second section in the direction close to the first side wall, that is, the first section protrudes from the second section in the direction close to the first side wall, it is convenient to connect the first section with the first electrode tab, and to connect the second section with the electrode post, and the spacing distance between the main body and the first side wall can be made smaller, and the accommodating space can have more space for accommodating the electrode assembly, which can make the volume of the electrode assembly larger, thereby improving the energy density of the electrochemical device.

[0028] In some embodiments, the first connecting member is a straight structure.

[0029] In the above technical solution, by setting the first connecting member as a straight structure, the first connecting member does not need to be bent, thereby reducing the safety risk of short circuit inside the electrochemical device caused by bending of the first connecting member, simplifying the shell insertion process, and the structure of the first connecting member is simple and easy to prepare.

[0030] In some embodiments, the thickness of the first connecting member is T, satisfying 0.05 mm ≤ T ≤ 0.1 mm.

[0031] In some embodiments, by setting the thickness T of the first connecting member to 0.05 mm to 0.1 mm, the strength of the first connecting member can be increased and it is not easy to deform, so that the connection reliability between the first connecting member and the first electrode tab and the electrode column is higher, the first connecting member is not likely to cause damage to other internal components of the electrochemical device, and the space occupied by the first connecting member in the first direction is smaller, which can further make the spacing distance between the main body and the first side wall smaller, and the accommodating space can have more space for accommodating the electrode assembly, which can make the volume of the electrode assembly larger, thereby improving the energy density of the electrochemical device.

[0032] In some embodiments, the pole includes a pole body, a connecting plate and a seal. The connecting plate is a metal plate, which is arranged at the first through hole and connected to the first side wall. A second through hole is provided on the connecting plate. The pole body passes through the second through hole. The seal is arranged between the connecting plate and the pole body, and the second section is connected to the pole body.

[0033] In the above technical solution, the pole includes a pole body, a connecting piece and a seal. The connecting piece is a metal piece, which is arranged at the first through hole and connected to the first side wall. The pole as a whole can be directly installed on the first side wall. The preparation and installation of the pole are less difficult and have better versatility. A second through hole is provided on the connecting piece, and the pole body is provided through the second through hole. The seal is provided between the connecting piece and the pole body. The second section is connected to the pole body, so that the seal can achieve sealing between the connecting piece and the pole body. The connecting piece is connected to the first side wall, which can achieve sealing between the shell and the pole, thereby improving the sealing effect of the electrochemical device.

[0034] In some embodiments, the pole body includes a first conductive portion, a second conductive portion, and a third conductive portion, wherein the first conductive portion is located on a first side of the connecting piece along a thickness direction thereof, the second conductive portion is located on a second side of the connecting piece along the thickness direction thereof, opposite to the first side, and the third conductive portion is disposed through the second through hole, electrically connecting the first conductive portion and the second conductive portion.

[0035] The sealing member includes a first sealing member and a second sealing member. The first sealing member is arranged between the first conductive part and the connecting piece, and the second sealing member is arranged between the second conductive part and the connecting piece.

[0036] In the above technical solution, the pole body includes a first conductive part, a second conductive part and a third conductive part. The first conductive part is located on the first side of the connecting piece along the thickness direction thereof, and can be used to achieve electrical connection with other devices located on the first side of the connecting piece; the second conductive part is located on the second side of the connecting piece opposite to the first side along the thickness direction thereof, and can be used to achieve electrical connection with other devices located on the second side of the connecting piece; the third conductive part is arranged through the second through hole, and the third conductive part electrically connects the first conductive part and the second conductive part, so that the components electrically connected to the first conductive part and the components electrically connected to the second conductive part can be electrically connected; the seal includes a first seal and a second seal, the first seal is arranged between the first conductive part and the connecting piece, and can achieve sealing between the first conductive part and the connecting piece; the second seal is arranged between the second conductive part and the connecting piece, and can achieve sealing between the second conductive part and the connecting piece. By arranging the first seal and the second seal, the reliability of the seal between the pole body and the connecting piece can be improved.

[0037] In some embodiments, the first conductive portion and the third conductive portion are integrally formed, a plug hole is provided on the second conductive portion, a portion of the third conductive portion is plugged into the plug hole, and is electrically connected to the second conductive portion in the plug hole.

[0038] In the above technical solution, by integrally forming the first conductive part and the third conductive part, the overall structure of the first conductive part and the third conductive part can be made more stable, and the preparation process of the pole body can be simpler; by providing a plug-in hole on the second conductive part, part of the third conductive part is plugged into the plug-in hole and electrically connected to the second conductive part in the plug-in hole, the connection between the second conductive part and the third conductive part can be achieved by plugging, and the second conductive part is not easily displaced relative to the third conductive part. The overall structure of the pole body is more stable, and the electrical connection reliability of the second conductive part and the third conductive part is higher.

[0039] In some embodiments, a diameter D of the first through hole satisfies 1 mm ≤ D ≤ 10 mm.

[0040] In the above technical solution, by setting the diameter D of the first through hole to 1 mm to 10 mm, the first through hole can have sufficient space to allow the electrode to pass through, and when the electrode is installed on the first side wall, the edge of the electrode is not easy to exceed the edge of the first side wall, which can reduce the possibility of the occupied space of the electrochemical device becoming larger, and can also reduce the possibility of interference between the electrode and other devices.

[0041] In some embodiments, the electrode assembly further includes a second tab having opposite polarity to the first tab, the second tab being disposed on a side of the main body close to the first side wall, and the electrochemical device further includes a second connector electrically connecting the second tab and the shell.

[0042] In the above technical solution, the electrode assembly also includes a second electrode tab with opposite polarity to the first electrode tab, and the second electrode tab is arranged on the side of the main body close to the first side wall, so that the first electrode tab and the second electrode tab can share the spacing space between the main body and the first side wall, thereby reducing the space occupied by the first electrode tab and the second electrode tab, which is conducive to improving the energy density of the electrochemical device; the electrochemical device also includes a second connector, which electrically connects the second electrode tab and the shell, so that the main body can be electrically connected to other devices through the second electrode tab, the second connector and the shell, so that other devices electrically connected to the electrode column and the shell respectively can realize a complete electrical connection circuit with the electrochemical device.

[0043] In some embodiments, the second connecting member is U-shaped.

[0044] In the above technical solution, by arranging the second connecting member into a U shape, it is convenient to connect the second connecting member to the second electrode tab and the shell respectively after the electrode assembly is installed in the shell.

[0045] An electrical device comprises the electrochemical device as described above, and the electrochemical device is used to provide electrical energy.

[0046] A method for preparing an electrochemical device, comprising:

[0047] A shell, an electrode assembly, an electrode column and a first connecting member are provided, wherein a first through hole is provided on a first side wall of the shell;

[0048] The pole is arranged to pass through the first through hole;

[0049] Connect the pole to the first section of the first connector, and position the second section of the first connector outside the housing. The angle between the length direction of the first connector and the edge of the first side wall is set at 45° to 90°.

[0050] Connecting the first tab of the electrode assembly to the second section of the first connector;

[0051] Rotate the electrode assembly, the first connector, and the electrode post together around the first through hole to install the electrode assembly in the accommodating space of the shell;

[0052] Fix the pole to the housing.

[0053] In the above technical solution, the pole is first connected to the first section of the first connector, without being blocked by the main body of the electrode assembly, and the connection operation is more convenient; the second section of the first connector is located outside the shell, and the first pole ear of the electrode assembly is connected to the second section of the first connector located outside the shell, without being blocked by other components, and the connection operation is more convenient; then the electrode assembly, the first connector and the pole are rotated together around the first through hole to install the electrode assembly in the accommodating space of the shell, that is, before the electrode assembly is installed in the accommodating space, the first section of the first connector is connected to the pole, and the second section of the first connector is connected to the first pole ear of the electrode assembly, the connection operation is more convenient, and there is no need to reserve part of the accommodating space for connection. The first connector and the pole, the first connector and the pole ear, thereby reducing the space occupied by the first connector, reducing the spacing distance between the main body of the electrode assembly and the first side wall, and allowing more space to accommodate the electrode assembly, making the volume of the electrode assembly larger, thereby improving the energy density of the electrochemical device; by making the second section of the first connector located outside the shell, the angle between the length direction of the first connector and the edge of the first side wall is 45° to 90°, which can facilitate the connection between the second section of the first connector and the first pole ear of the electrode assembly, and facilitate the connection between the second section of the first connector and the first pole ear, so that the electrode assembly, the first connector and the pole are rotated together around the first through hole to install the electrode assembly in the accommodating space of the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can also be obtained based on these drawings.

[0055] FIG1 is a schematic diagram of the three-dimensional structure of an electrochemical device provided in some embodiments of the present application;

[0056] FIG2 is a schematic diagram of an exploded structure of an electrochemical device provided in some embodiments of the present application;

[0057] FIG3 is a schematic structural diagram of a housing and a first connector of an electrochemical device according to some embodiments of the present application from one perspective;

[0058] FIG4 is a schematic diagram of the three-dimensional structure of a first connecting member of an electrochemical device provided in some embodiments of the present application;

[0059] FIG5 is a schematic structural diagram of an electrochemical device according to some embodiments of the present application from one perspective;

[0060] FIG6 is a schematic diagram of a partially enlarged structure of the electrochemical device at point A in FIG5 ;

[0061] FIG7 is a schematic structural diagram of a first connecting member of an electrochemical device according to some embodiments of the present application from one perspective;

[0062] FIG8 is a schematic diagram of the three-dimensional structure of an electrode of an electrochemical device provided in some embodiments of the present application;

[0063] FIG9 is a schematic structural diagram of an electrode of an electrochemical device provided by some embodiments of the present application from one perspective;

[0064] FIG10 is a schematic cross-sectional view of an electrode of an electrochemical device according to some embodiments of the present application;

[0065] FIG11 is a schematic diagram of an exploded structure of an electrode of an electrochemical device provided in some embodiments of the present application;

[0066] FIG12 is a schematic structural diagram of a housing of an electrochemical device provided in some embodiments of the present application from one perspective;

[0067] FIG13 is a schematic flow chart of a method for preparing an electrochemical device according to some embodiments of the present application;

[0068] FIG14 is a perspective schematic diagram of a partial structure of an electrochemical device provided by some embodiments of the present application;

[0069] FIG15 is a perspective schematic diagram of a partial structure of an electrochemical device provided by some embodiments of the present application;

[0070] FIG16 is a schematic diagram of a partial structure of an electrochemical device provided by some embodiments of the present application from one perspective;

[0071] FIG17 is a perspective schematic diagram of a partial structure of an electrochemical device provided by some embodiments of the present application;

[0072] FIG18 is a perspective schematic diagram of a partial structure of an electrochemical device provided in some embodiments of the present application.

[0073] Icons: 10-electrochemical device; 100-housing; 101-accommodation space; 102-first through hole; 110-first side wall; 120-second side wall; 130-third side wall; 140-fourth side wall; 150-bottom wall; 200-electrode assembly; 210-body; 211-first side surface; 220-first tab; 230-second tab; 300-electrode column; 301-second through hole; 302-connection hole; 310-electrode column body; 311-first conductive portion; 312- Second conductive part; 3121-second end face; 313-third conductive part; 3131-first part; 3132-second part; 3133-step surface; 3134-third end face; 320-connecting piece; 330-sealing member; 331-first sealing member; 332-second sealing member; 400-first connecting member; 410-first section; 420-second section; 430-third section; 500-second connecting member; 600-shell cover; X-first direction; Y-second direction; Z-third direction.

[0074] Specific embodiment

[0075] To make the purpose, technical solutions, and advantages of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0076] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0077] The terms "first", "second" and the like in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0078] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0079] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0080] The electrochemical device includes a shell, an electrode assembly, and a pole arranged through the shell. The electrode assembly is arranged in the shell. One end of the pole is electrically connected to the electrode lug of the electrode assembly through a connector, and the other end is exposed to the shell, so that the main body of the electrode assembly can be electrically connected to other devices through the pole.

[0081] With the development of the new energy industry, batteries are gradually developing in the direction of high energy density and high power density. However, at present, the connectors connecting the poles and the tabs of the electrode assembly generally first install the electrode assembly in the accommodating space of the shell, and then weld the connectors to the poles and tabs respectively. Therefore, it is necessary to reserve space between the main body of the electrode assembly and the first side wall of the shell where the pole is provided, so that the connectors can be welded to the poles and tabs respectively. However, this will result in limited space for accommodating the electrode assembly, affecting the energy density of the battery, and it is necessary to weld the connectors to the poles and tabs in a small space, resulting in complicated welding operations, high difficulty in assembling the electrochemical device, and low preparation efficiency of the electrochemical device.

[0082] Based on the above considerations, in order to solve the problem of high difficulty in assembling electrochemical devices, the present application provides an electrochemical device, which includes a shell, an electrode assembly, a pole and a first connecting member. The shell is formed with a accommodating space, and a first through hole is provided on the first side wall of the shell; the electrode assembly is accommodated in the accommodating space, and the electrode assembly includes a main body and a first pole ear, and the first pole ear is provided on a side of the main body close to the first side wall; the pole is provided through the first through hole; the first connecting member is provided in the accommodating space, and the first connecting member includes a first section and a second section, the first section is connected to the first pole ear, and the second section is connected to the pole The first and second segments of the housing are connected, and when viewed along a first direction, the first section and the second section do not overlap. The first direction is parallel to the arrangement direction of the electrode assembly and the first sidewall. The housing further includes a second sidewall connected to the first sidewall. The first connector includes a first end face and a second end face arranged opposite each other along the length direction. The distance from the first end face to the center of the pole is less than the distance from the second end face to the center of the pole. The distance from the center of the pole to the first end face along the second direction is L1. The distance from the center of the pole to the bottom wall of the housing is L2. The distance from the center of the pole to the second sidewall is L3, satisfying L1≤L2 and L1≤L3. The housing forms a housing space that can be used to accommodate the electrode assembly and the first connector, thereby protecting the electrode assembly and the first connector. A first through hole is provided on the first side wall of the housing, and the electrode is provided through the first through hole. The electrode assembly includes a main body and a first tab, and the first tab is provided on a side of the main body near the first side wall. The first connector includes a first section and a second section, the first section is connected to the first tab, and the second section is connected to the electrode, so that the main body can be electrically connected to other devices via the first tab, the first connector, and the electrode. When viewed along a first direction, the first section and the second section do not overlap. The first direction is parallel to the arrangement direction of the electrode assembly and the first side wall. This allows the first connector to be smaller in the first direction, and the first connector occupies less space in the accommodation space, leaving more room for accommodating the electrode assembly, making the electrode assembly larger, and thus improving the energy density of the electrochemical device. The shortest distance L1 from the center of the pole to the first end face along the second direction, the distance L2 from the center of the pole to the bottom wall of the shell, and the distance L3 from the center of the pole to the second side wall satisfy L1≤L2, L1≤L3. This ensures that after the first connecting member is connected to the electrode assembly and the pole, the first connecting member is unlikely to interfere with the shell during the process of the electrode assembly and the pole being rotated together into the accommodating space, thereby smoothing the assembly process of the electrochemical device. In addition, this assembly method can simplify the assembly process of the electrochemical device, reduce the difficulty of assembling the electrochemical device, and improve the preparation efficiency of the electrochemical device.

[0083] In this application, an electrochemical device may be a secondary battery or a primary battery. For example, the electrochemical device may be a lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, although this is not limited in the present embodiments. The electrochemical device may be cylindrical, flat, rectangular, or in other shapes, although this is not limited in the present embodiments. The electrode assembly may be a wound or laminated structure, although this is not limited in the present embodiments.

[0084] The present invention provides an electrical device that uses an electrochemical device as a power source. The electrical device may include, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, and the like. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like.

[0085] The electrochemical device described in the embodiments of the present application is not limited to being applicable to the electrical equipment described above, but can also be applicable to all electrical equipment that uses the electrochemical device.

[0086] Referring to Figures 1 to 4, Figure 1 is a schematic diagram of the three-dimensional structure of the electrochemical device provided in some embodiments of the present application; Figure 2 is a schematic diagram of the exploded structure of the electrochemical device provided in some embodiments of the present application; Figure 3 is a schematic diagram of the structure of the shell and the first connecting member of the electrochemical device provided in some embodiments of the present application from one perspective; Figure 4 is a schematic diagram of the three-dimensional structure of the first connecting member of the electrochemical device provided in some embodiments of the present application.

[0087] An embodiment of the present application provides an electrochemical device 10, comprising a housing 100, an electrode assembly 200, an electrode post 300, and a first connector 400. The housing 100 defines a receiving space 101, and a first through-hole 102 is provided on a first sidewall 110 of the housing 100. The electrode assembly 200 is accommodated within the receiving space 101 and includes a main body 210 and a first electrode tab 220. The first electrode tab 220 is disposed on a side of the main body 210 adjacent to the first sidewall 110. The electrode post 300 extends through the first through-hole 102. The first connector 400 is disposed within the receiving space 101 and includes a first section 410 and a second section 420. The first section 410 is connected to the first electrode tab 220, and the second section 420 is connected to the electrode post 300. When viewed along a first direction X, the first section 410 and the second section 420 do not overlap. The first direction X is parallel to the arrangement direction of the electrode assembly 200 and the first sidewall 110. The housing 100 further includes a second sidewall 120 connected to the first sidewall 110. The distance from the center of the pole 300 to the first end surface of the first connector 400 along the second direction Y is L1, the distance from the center of the pole 300 to the bottom wall 150 of the housing 100 is L2, and the distance from the center of the pole 300 to the second sidewall 120 is L3, satisfying L1≤L2 and L1≤L3. For example, L1=L2, L1=0.5*L2, L1=L3, L1=0.6*L3, etc.

[0088] In some embodiments, the main body 210 is composed of a positive electrode sheet, a negative electrode sheet, and a separator. The housing 100 is also used to hold the electrolyte. The electrochemical device 10 primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive electrode collector. The portion of the positive electrode collector not coated with the positive active material layer serves as the positive electrode tab, allowing electrical energy to be input or output from the positive electrode sheet through the positive electrode tab. Taking a lithium-ion battery as an example, the positive electrode current collector can be made of aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, a ternary material, or lithium manganese oxide, among others. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative electrode collector. The portion of the negative electrode collector not coated with the negative active material layer serves as the negative electrode tab, allowing electrical energy to be input or output from the negative electrode sheet through the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be made of carbon or silicon. The separator can be made of polypropylene (PP) or polyethylene (PE). Furthermore, the electrode assembly can be a wound or laminated structure, which is not limited in this embodiment.

[0089] In some embodiments, the main body 210 has a first side surface 211 and a second side surface (not shown) opposite to the first side wall 110 along the first direction X. Along the first direction X, the distance between the first side surface 211 and the first side wall 110 is smaller than the distance between the second side surface and the first side wall 110. The first tab 220 is disposed on a side of the main body 210 close to the first side wall 110, that is, the first tab 220 is disposed on the first side surface 211 of the main body 210.

[0090] In some embodiments, the first segment 410 and the first tab 220 may be welded, for example, by laser welding. By welding the first segment 410 and the first tab 220, the connection force between the first segment 410 and the first tab 220 can be increased, making it difficult for the first segment 410 to separate from the first tab 220.

[0091] In some embodiments, the second section 420 and the pole 300 may be welded, for example, by laser welding. By welding the second section 420 to the pole 300, the connection force between the second section 420 and the pole 300 can be increased, making it difficult for the second section 420 to separate from the pole 300.

[0092] In some embodiments, the shell 100 includes multiple side walls and a bottom wall 150, the multiple side walls include a first side wall 110, a second side wall 120, a third side wall 130 and a fourth side wall 140, the first side wall 110 is arranged opposite to the third side wall 130, the second side wall 120 is arranged opposite to the fourth side wall 140, the first side wall 110 is connected to the second side wall 120 and the fourth side wall 140 respectively, and the third side wall 130 is connected to the second side wall 120 and the fourth side wall 140 respectively.

[0093] In this embodiment, the first direction X is the length direction of the second side wall 120 , the second direction Y is the length direction of the first side wall 110 , and the third direction Z is the thickness direction of the electrochemical device 10 . The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0094] In some embodiments, the electrochemical device 10 further includes a cover 600 , which is disposed on the housing 100 . The first sidewall 110 , the second sidewall 120 , the third sidewall 130 , the fourth sidewall 140 , the bottom wall 150 , and the cover 600 together form a closed accommodating space 101 .

[0095] In some embodiments, the cover 600 is plate-shaped and can close the opening formed by the housing 100.

[0096] In other embodiments, the shell cover 600 may also be a hollow structure with one end open, and the open side of the shell cover 600 covers the open side of the housing 100 to form an accommodating space.

[0097] In some embodiments, the shell 100 and the shell cover 600 can be made of materials such as aluminum, nickel, and stainless steel, so that the shell 100 and the shell cover 600 have high stress-bearing performance, are not easy to rust, and have a long service life.

[0098] In some embodiments, the cover 600 and the housing 100 may be welded, such as by laser welding. By welding the cover 600 and the housing 100, the connection force between the cover 600 and the housing 100 can be increased, and the cover 600 is not easily separated from the housing 100.

[0099] In some embodiments, the shell cover 600 and the housing 100 may be made of the same metal material to facilitate welding of the shell cover 600 and the housing 100 .

[0100] The electrochemical device 10 includes a housing 100, an electrode assembly 200, an electrode post 300, and a first connector 400. The housing 100 forms a housing space 101 that can be used to accommodate the electrode assembly 200 and the first connector 400, thereby protecting the electrode assembly 200 and the first connector 400. A first through-hole 102 is provided on the first sidewall 110 of the housing 100, and the electrode post 300 is disposed through the first through-hole 102. The electrode assembly 200 includes a main body 210 and a first tab 220. The first tab 220 is disposed on a side of the main body 210 near the first sidewall 110. The first connector 400 includes a first section 410 and a second section 420. The first section 410 is connected to the first tab 220, and the second section 420 is connected to the electrode post 300, so that the main body 210 can be electrically connected to other devices (not shown) via the first tab 220, the first connector 400, and the electrode post 300. When viewed along the first direction X, the first section 410 and the second section 420 do not overlap. The first direction X is parallel to the arrangement direction of the electrode assembly 200 and the first side wall 110, so that the first connector 400 is smaller in the first direction X. The first connector 400 occupies less space in the accommodating space 101, and the accommodating space 101 can have more space for accommodating the electrode assembly 200, which can make the volume of the electrode assembly 200 larger, thereby improving the energy density of the electrochemical device 10; so that the distance L1 from the center of the pole 300 to the first end face of the first connector 400 along the second direction Y is greater than that of the pole. The distance L2 from the center of 300 to the bottom wall 150 of the shell 100, and the distance L3 from the center of the pole 300 to the second side wall 120 satisfy L1≤L2, L1≤L3, so that after the first connecting member 400 is connected to the electrode assembly 200 and the pole 300, the first connecting member is not likely to interfere with the shell during the process of the electrode assembly 200 and the pole 300 being rotated together into the accommodating space, so that the assembly process of the electrochemical device is smooth, and this assembly method can simplify the assembly process of the electrochemical device 10, reduce the assembly difficulty of the electrochemical device 10, and improve the preparation efficiency of the electrochemical device 10.

[0101] In some embodiments, the thickness of the housing 100 is H, satisfying 1 / 2*H≤L2≤H. For example, L2 can be 1 / 2*H, 4 / 5*H, or H, etc.

[0102] By ensuring that the thickness H of the housing 100 and the distance L2 from the center of the pole 300 to the bottom wall 150 of the housing 100 satisfy 1 / 2*H≤L2≤H, the center of the pole 300 can be made farther from the bottom wall 150 of the housing 100, so that the length of the first connector 400 from the center of the pole 300 to the end face of the first connector 400 close to the pole 300 can be set to be larger, thereby facilitating the connection between the first connector 400 and the pole 300 and reserving a larger space for the first connector 400 to rotate relative to the housing 100, thereby reducing the possibility of interference between the first connector 400 and the housing 100.

[0103] In some embodiments, the distance L2 from the center of the pole 300 to the bottom wall 150 of the housing 100 and the distance L3 from the center of the pole 300 to the second side wall 120 also satisfy L2 = L3. It should be noted that tolerances may occur during the process, and a tolerance range of less than 0.5 mm is considered normal.

[0104] By ensuring that the distance L2 from the center of the electrode 300 to the bottom wall 150 of the shell 100 and the distance L3 from the center of the electrode 300 to the second side wall 120 also satisfy L2=L3, the first connector 400 can be easily rotated relative to the shell 100, is less likely to interfere with the shell 100, and the energy density of the electrochemical device 10 can be increased. If L2 is less than L3, due to L1≤L2, after the first connecting member 400 is accommodated in the accommodating space, the end surface of the first connecting member 400 connected to the electrode 300 is relatively far away from the second side wall 120. After the first connecting member 400 and the electrode assembly 200 are rotated relative to the shell 100 and placed in the accommodating space, a large gap may exist between the electrode assembly 200 and the second side wall 120, causing part of the accommodating space to be vacant and wasted, affecting the energy density of the electrochemical device 10. If L2 is greater than L3, due to L1≤L2, L1 may be larger than L3, causing the first connecting member 400 to interfere with the second side wall 120 during the rotation relative to the shell 100, making it difficult for the first connecting member 400 and the electrode assembly 200 to enter the shell.

[0105] In some embodiments, the distance L3 from the center of the pole 300 to the second side wall 120 satisfies 3 mm ≤ X ≤ 15 mm. For example, L3 may be 3 mm, 8 mm, or 15 mm.

[0106] In some embodiments, the pole 300 is circular, and the center of the pole 300 is the center of the circle of the pole 300 .

[0107] By ensuring that the distance L3 from the center of the pole 300 to the second side wall 120 satisfies 3mm≤L3≤15mm, sufficient space is reserved between the center of the pole 300 and the second side wall 120 for the first connector 400 to rotate, and the energy density of the electrochemical device 10 can be increased. If L3 is too large, after the first connector 400 and the electrode assembly 200 are rotated relative to the shell 100 and placed into the accommodating space, a large gap may exist between the electrode assembly 200 and the second side wall 120, causing part of the accommodating space to be vacant and wasted, affecting the energy density of the electrochemical device 10; if L3 is too small, the space reserved from the center of the pole 300 to the second side wall 120 is small, and the first connector 400 may interfere with the second side wall 120 during the rotation relative to the shell 100, making it difficult for the first connector 400 and the electrode assembly 200 to enter the shell, or making the length of the first connector 400 from the center of the pole 300 to the end face of the first connector 400 close to the pole 300 short, making it inconvenient for the first connector 400 to connect with the pole 300.

[0108] 5 and 6 , FIG5 is a schematic structural diagram of an electrochemical device provided in some embodiments of the present application from one perspective; FIG6 is a schematic structural diagram of a local enlargement of point A of the electrochemical device in FIG5 .

[0109] In some embodiments, the distance between the main body 210 and the first sidewall 110 is S, which satisfies 1.9 mm ≤ S ≤ 2.05 mm.

[0110] By setting the spacing distance between the main body 210 and the first side wall 110 to S and satisfying 1.9mm≤S≤2.05mm, there can be sufficient space between the main body 210 and the first side wall 110 to accommodate the first electrode tab 220, the first connecting member 400 and part of the electrode post 300, and the first connecting member 400 and the electrode post 300 are less likely to have problems such as short circuit with the main body 210. In addition, the spacing distance between the main body 210 and the first side wall 110 is reduced, and the accommodating space 101 can have more space for accommodating the electrode assembly 200, which can make the volume of the electrode assembly 200 larger, thereby improving the energy density of the electrochemical device 10.

[0111] In some embodiments, the end of the first section 410 can be arranged in an arc shape to facilitate adaptation and connection with the circular pole 300, and to prevent the first connector 400 from interfering with other components when rotating around the first through hole 102, thereby reducing the possibility of damage to the first connector 400 or other components.

[0112] In some embodiments, the end of the second segment 420 can be set in a square shape to facilitate adaptive connection with the first electrode tab 220, so that the connection area between the second segment 420 and the first electrode tab 220 is larger, the connection strength is higher, and the second segment 420 is not easily separated from the first electrode tab 220.

[0113] In some embodiments, the first connector 400 further includes a third section 430 , which connects the first section 410 and the second section 420 . The first section 410 and the second section 420 extend from two ends of the third section 430 in opposite directions.

[0114] By providing the third section 430 on the first connector 400, the third section 430 connects the first section 410 and the second section 420, and the first section 410 and the second section 420 extend in opposite directions from both ends of the third section 430, respectively. This facilitates the fitting connection between the first section 410 and the first electrode tab 220, and facilitates the fitting connection between the second section 420 and the electrode column 300. In addition, the first connector 400 does not need to be bent during the assembly process, thereby reducing the safety risk of internal short circuit of the electrochemical device caused by bending of the first connector 400, and simplifying the shell insertion process of the electrode assembly 200.

[0115] 4 and 7 , FIG7 is a schematic structural diagram of a first connecting member of an electrochemical device provided in some embodiments of the present application from one perspective.

[0116] In some embodiments, the first segment 410 is arranged at an angle to the third segment 430, and the second segment 420 is arranged at an angle to the third segment 430. For example, as shown in FIG7 , the angle between the length direction of the first segment 410 and the length direction of the third segment 430 is α, and the angle between the length direction of the second segment 420 and the length direction of the third segment 430 is β.

[0117] Since the connection surface between the first electrode tab 220 and the first section 410 and the connection surface between the electrode 300 and the second section 420 are not on the same plane, by setting the first section 410 and the third section 430 at an angle, and the second section 420 and the third section 430 at an angle, it is possible to facilitate the connection between the first section 410 and the first electrode tab 220, and the connection between the second section 420 and the electrode 300, and the spacing distance between the main body 210 and the first side wall 110 can be made smaller, so that the accommodating space 101 can have more space for accommodating the electrode assembly 200, and the volume of the electrode assembly 200 can be made larger, thereby improving the energy density of the electrochemical device 10.

[0118] In some embodiments, the angle between the first segment 410 and the third segment 430 is α, and the angle between the second segment 420 and the third segment 430 is β, satisfying 45°≤α≤90° and 45°≤β≤90°. For example, α can be 45°, 60°, or 90°, and β can be 45°, 70°, or 90°, etc.

[0119] By making the angle α between the first section 410 and the third section 430 and the angle β between the second section 420 and the third section 430 satisfy 45°≤α≤90° and 45°≤β≤90°, it is possible to further facilitate the connection between the first section 410 and the first electrode tab 220 and to further facilitate the connection between the second section 420 and the electrode 300.

[0120] In some embodiments, the third section 430 protrudes from the second section 420 toward the first sidewall 110 .

[0121] Since the connection surface between the first electrode tab 220 and the first section 410 is closer to the first side wall 110 than the connection surface between the electrode post 300 and the second section 420, by making the third section 430 protrude from the second section 420 in the direction close to the first side wall 110, that is, the first section 410 protrudes from the second section 420 in the direction close to the first side wall 110, it is convenient to connect the first section 410 with the first electrode tab 220, and to connect the second section 420 with the electrode post 300, and the spacing distance between the main body 210 and the first side wall 110 can be made smaller, so that the accommodating space 101 can have more space for accommodating the electrode assembly 200, which can make the volume of the electrode assembly 200 larger, thereby improving the energy density of the electrochemical device 10.

[0122] In some embodiments, the first section 410 , the second section 420 , and the third section 430 may be integrally formed.

[0123] In other embodiments, the first section 410 , the second section 420 , and the third section 430 may also be separately prepared and formed, and then fixedly connected by welding, bonding, or the like.

[0124] In some embodiments, the third section 430 may be a straight structure, an arc-shaped structure, etc.

[0125] In other embodiments, the first connecting member 400 is a straight structure.

[0126] By setting the first connector 400 as a straight structure, the first connector 400 does not need to be bent, reducing the safety risk of internal short circuit of the electrochemical device 10 caused by bending of the first connector 400, simplifying the shell insertion process, and the structure of the first connector 400 is simple and easy to prepare.

[0127] In some embodiments, the thickness of the first connector 400 is T, which satisfies 0.05 mm ≤ T ≤ 0.1 mm. For example, T can be 0.05 mm, 0.08 mm, or 0.1 mm.

[0128] By setting the thickness T of the first connecting member 400 to 0.05 mm to 0.1 mm, the strength of the first connecting member 400 can be increased and it is not easy to deform, so that the connection reliability between the first connecting member 400 and the first electrode ear 220 and the electrode column 300 is high, and the first connecting member 400 is not likely to cause damage to other internal components of the electrochemical device 10. In addition, the space occupied by the first connecting member 400 in the first direction X is small, which can further make the spacing distance between the main body 210 and the first side wall 110 smaller, and the accommodating space 101 can have more space for accommodating the electrode assembly 200, which can make the volume of the electrode assembly 200 larger, thereby improving the energy density of the electrochemical device 10.

[0129] In some embodiments, the first connector 400 may be made of steel or nickel, which is not easy to rust, has a long service life, and is easy to weld with the first tab 220 and the pole 300 .

[0130] Referring to Figures 8 to 11, Figure 8 is a schematic diagram of the three-dimensional structure of the pole of the electrochemical device provided in some embodiments of the present application; Figure 9 is a schematic diagram of the structure from one perspective of the pole of the electrochemical device provided in some embodiments of the present application; Figure 10 is a schematic diagram of the cross-sectional structure of the pole of the electrochemical device provided in some embodiments of the present application; Figure 11 is a schematic diagram of the exploded structure of the pole of the electrochemical device provided in some embodiments of the present application.

[0131] In some embodiments, the pole 300 includes a pole body 310, a connecting piece 320 and a seal 330. The connecting piece 320 is a metal sheet. The connecting piece 320 is arranged at the first through hole 102 and is connected to the first side wall 110. A second through hole 301 is provided on the connecting piece 320. The pole body 310 is arranged through the second through hole 301. The seal 330 is arranged between the connecting piece 320 and the pole body 310. The second section 420 is connected to the pole body 310.

[0132] The electrode 300 includes a body 310, a connecting piece 320, and a sealing member 330. The connecting piece 320 is a metal sheet and is disposed at the first through-hole 102 and connected to the first sidewall 110. This allows the entire electrode 300 to be directly mounted on the first sidewall 110. This reduces the difficulty of manufacturing and installing the electrode 300 and improves versatility. The connecting piece 320 is provided with a second through-hole 301, and the body 310 is disposed through the second through-hole 301. The sealing member 330 is disposed between the connecting piece 320 and the body 310. The second section 420 is connected to the body 310, allowing the sealing member 330 to seal the connecting piece 320 and the body 310. The connecting piece 320 is connected to the first sidewall 110, thereby sealing the housing 100 and the electrode 300, thereby improving the sealing effect of the electrochemical device 10.

[0133] In some embodiments, the connecting piece 320 and the first side wall 110 may be welded, for example, by laser welding. By welding the connecting piece 320 to the first side wall 110, the sealing between the connecting piece 320 and the first side wall 110 is improved, and leakage is less likely to occur. Furthermore, the connecting force between the connecting piece 320 and the first side wall 110 is greater, and the connecting piece 320 is less likely to separate from the housing 100.

[0134] In some embodiments, the housing 100 and the connecting piece 320 can be made of materials such as stainless steel and nickel, which are not easy to rust, have a long service life, and are easy to weld the housing 100 and the connecting piece 320 .

[0135] In some embodiments, a passivation layer may be formed on the surface of the connection sheet 320 , and the sealing member 330 is bonded to the passivation layer.

[0136] At present, in electrochemical devices that directly set a seal between the pole body and the shell to form a seal, if the sealing between the seal and the shell is to be improved, the entire shell needs to be passivated, which is difficult to process and expensive. In the present application, only the connecting piece 320 needs to be passivated, which is less difficult to process and less expensive. By forming a passivation layer on the surface of the connecting piece 320 and bonding the seal 330 to the passivation layer, a connecting key can be formed between the seal 330 and the passivation layer, thereby improving the sealing effect between the seal 330 and the connecting piece 320, and the passivation layer can slow down the corrosion rate of the connecting piece 320, thereby extending the service life of the connecting piece 320.

[0137] In some embodiments, the pole body 310 may be made of aluminum, which has the characteristics of being resistant to oxidation, having a large carrying voltage, being resistant to high temperatures, and being resistant to electrolyte corrosion.

[0138] In some embodiments, the pole body 310 includes a first conductive portion 311, a second conductive portion 312 and a third conductive portion 313, the first conductive portion 311 is located on the first side of the connecting piece 320 along its thickness direction, the second conductive portion 312 is located on the second side of the connecting piece 320 along its thickness direction opposite to the first side, the third conductive portion 313 is arranged through the second through hole 301, and the third conductive portion 313 electrically connects the first conductive portion 311 and the second conductive portion 312.

[0139] In some embodiments, the seal 330 may be made of a high molecular polymer, such as polypropylene (PP), which has good sealing performance and good chemical resistance.

[0140] The sealing member 330 includes a first sealing member 331 and a second sealing member 332 . The first sealing member 331 is disposed between the first conductive portion 311 and the connecting piece 320 , and the second sealing member 332 is disposed between the second conductive portion 312 and the connecting piece 320 .

[0141] The pole body 310 includes a first conductive portion 311, a second conductive portion 312, and a third conductive portion 313. The first conductive portion 311 is located on a first side of the connecting piece 320 along its thickness direction and can be used to electrically connect to other devices located on the first side of the connecting piece 320. The second conductive portion 312 is located on a second side of the connecting piece 320 along its thickness direction, opposite the first side, and can be used to electrically connect to other devices located on the second side of the connecting piece 320. The third conductive portion 313 is disposed through the second through-hole 301 and electrically connects the first conductive portion 311 and the second conductive portion 312, thereby enabling electrical connection between components electrically connected to the first conductive portion 311 and the second conductive portion 312. The seal 330 includes a first seal 331 and a second seal 332. The first seal 331 is disposed between the first conductive portion 311 and the connecting piece 320 to achieve a seal between the first conductive portion 311 and the connecting piece 320. The second seal 332 is arranged between the second conductive part 312 and the connecting piece 320, and can achieve sealing between the second conductive part 312 and the connecting piece 320. By providing the first seal 331 and the second seal 332, the reliability of the sealing between the pole body 310 and the connecting piece 320 can be improved.

[0142] In some embodiments, the first seal 331 and / or the second seal 332 extend into the second through-hole 301. By extending the first seal 331 and / or the second seal 332 into the second through-hole 301, the sealing connection area between the first seal 331 and / or the second seal 332 and the connecting piece 320 can be increased. While the total sealing connection area between the first seal 331 and / or the second seal 332 and the connecting piece 320 remains unchanged, the width of the first seal 331 and / or the second seal 332 in a direction perpendicular to the centerline of the second through-hole 301 (Y or Z) can be set to be smaller, thereby reducing the overall size of the pole 300 in a plane perpendicular to the centerline of the second through-hole 301 (YZ plane), thereby adapting to a housing 100 with a smaller thickness, further improving the versatility of the pole 300.

[0143] In some embodiments, the first seal 331 and the second seal 332 can be integrally formed. After the first seal 331, the second seal 332 are assembled with the pole body 310 and the connecting piece 320, the structural stability is better, and the sealing connection area between the first seal 331, the second seal 332 and the connecting piece 320 can be further increased.

[0144] In some embodiments, the first conductive portion 311 and the third conductive portion 313 are integrally formed, the second conductive portion 312 is provided with a plug hole 302 , a portion of the third conductive portion 313 is plugged into the plug hole 302 and electrically connected to the second conductive portion 312 in the plug hole 302 .

[0145] By integrally forming the first conductive portion 311 and the third conductive portion 313, the overall structure of the first conductive portion 311 and the third conductive portion 313 is further stabilized. Furthermore, the pole body 310 comprises only two parts (one consisting of the first conductive portion 311 and the third conductive portion 313, and the other consisting of the second conductive portion 312), simplifying the manufacturing process of the pole body 310. By providing the insertion hole 302 on the second conductive portion 312, a portion of the third conductive portion 313 is inserted into the insertion hole 302 and electrically connected to the second conductive portion 312 within the insertion hole 302. This allows the second conductive portion 312 and the third conductive portion 313 to be connected by insertion, and the second conductive portion 312 is less likely to shift relative to the third conductive portion 313. This further stabilizes the overall structure of the pole body 310 and enhances the reliability of the electrical connection between the second conductive portion 312 and the third conductive portion 313.

[0146] In some embodiments, by plugging the second conductive part 312 and the third conductive part 313 together, the second conductive part 312 and the third conductive part 313 are pressed against the seal 330 and the connecting piece 320 in the first direction X to fix the seal 330 and the connecting piece 320 between the second conductive part 312 and the third conductive part 313.

[0147] In other embodiments, the positions of the pole body 310 and the connecting piece 320 may be fixed first, and then the seal 330 may be formed between the pole body 310 and the connecting piece 320 by injection molding.

[0148] In other embodiments, the first conductive portion 311 and the third conductive portion 313 may be provided as separate bodies and connected by plugging, welding, or bonding. For example, the first conductive portion 311 may be provided with a second plugging hole (not shown in the figure), and a portion of the third conductive portion 313 may be plugged into the second plugging hole and electrically connected to the first conductive portion 311 within the second plugging hole. This plugging connection can achieve connection between the first conductive portion 311 and the third conductive portion 313, and prevents the first conductive portion 311 from being displaced relative to the third conductive portion 313. This makes the overall structure of the pole body 310 more stable, and the electrical connection between the first conductive portion 311 and the third conductive portion 313 more reliable.

[0149] In other embodiments, the first conductive portion 311, the second conductive portion 312, and the third conductive portion 313 may be integrally formed. For example, after the pole body 310 passes through the connecting piece 320 and the sealing member 330 from one side, the second conductive portion 312 is formed on the second side of the connecting piece 320 and the sealing member 330 by riveting.

[0150] In some embodiments, the third conductive portion 313 includes a first portion 3131 and a second portion 3132 that are connected, the first portion 3131 is inserted into the plug hole 302, the second portion 3132 is located between the first portion 3131 and the first conductive portion 311, and the cross-sectional area of ​​the first portion 3131 is smaller than the cross-sectional area of ​​the second portion 3132, so that a step surface 3133 is formed between the first portion 3131 and the second portion 3132; the second conductive portion 312 abuts against the step surface 3133.

[0151] The cross section of the first portion 3131 is the cross section of the first portion 3131 on a plane perpendicular to the thickness direction of the connecting piece 320 , and the cross section of the second portion 3132 is the cross section of the second portion 3132 on a plane parallel to the thickness direction of the connecting piece 320 .

[0152] The thickness direction of the connecting piece 320 is the first direction X, and a plane perpendicular to the thickness direction of the connecting piece 320 is the YZ plane.

[0153] The third conductive portion 313 includes a first portion 3131 and a second portion 3132 connected to each other. The first portion 3131 is inserted into the insertion hole 302, and the second portion 3132 is located between the first portion 3131 and the first conductive portion 311. The cross-sectional area of ​​the first portion 3131 is smaller than the cross-sectional area of ​​the second portion 3132, so that a step surface 3133 is formed between the first portion 3131 and the second portion 3132. The second conductive portion 312 abuts against the step surface 3133, which can maintain a fixed distance between the second conductive portion 312 and the first conductive portion 311. When the second conductive portion 312 is inserted into the third conductive member 213, the second conductive portion 312 can exert sufficient compression on the first and second sealing members 331 and 332 to achieve a good sealing effect, while also reducing the possibility of the first and second sealing members 331 and 332 being damaged by excessive compression by the second conductive portion 312, thereby affecting the sealing effect.

[0154] In other embodiments, along the thickness direction of the connecting piece 320 (first direction X), the size of the third conductive part 313 on the vertical plane (YZ plane) in the thickness direction of the connecting piece 320 remains unchanged, which can simplify the preparation process of the third conductive part 313 and the assembly of the seal, the connecting piece 320 and the third conductive part 313.

[0155] In some embodiments, the third conductive portion 313 has a third end surface 3134 facing away from the first conductive portion 311 , the second conductive element 212 has a fourth end surface 3121 facing away from the first conductive portion 311 , and the third end surface 3134 is flush with the fourth end surface 3121 .

[0156] The third conductive portion 313 has a third end face 3134 facing away from the first conductive portion 311, and the second conductive portion 312 has a fourth end face 3121 facing away from the first conductive portion 311. By making the third end face 3134 flush with the fourth end face 3121, when the second side of the pole 300 (the side where the third end face 3134 and the fourth end face 3121 are located) is electrically connected to other components by bonding, the third end face 3134 and the fourth end face 3121 can simultaneously serve as connection surfaces, so that the area of ​​the connection surface is larger, the connection force with other components is greater, and the reliability is better.

[0157] Among them, the third end face 3134 and the fourth end face 3121 are flush, which can be understood in a broad sense. That is, when the distance between the plane where the third end face 3134 is located and the plane where the fourth end face 3121 is located in the thickness direction of the connecting piece 320 is within the error value range, the error value range within 2 mm can be understood as being flush.

[0158] In other embodiments, the third end face 3134 may also be recessed relative to the fourth end face 3121, so that when the second side of the pole 300 (the side where the third end face 3134 and the fourth end face 3121 are located) is electrically connected to other components by bonding, the fourth end face 3121 can serve as a connection surface.

[0159] In other embodiments, the third end face 3134 may also protrude relative to the fourth end face 3121, so that when the second side of the pole 30 (the side where the third end face 3134 and the fourth end face 3121 are located) is electrically connected to other components by bonding, the third end face 3134 can serve as a connection surface.

[0160] In other embodiments, the second conductive part 312 may not be provided with a plug hole, and the second conductive part 312 has a third end face (not shown in the figure) facing the first conductive part 311, and the third end face is bonded to the third end face 3134 of the third conductive part 313 to achieve electrical connection. By integrally forming the first conductive part 311 and the third conductive part 313, the overall structure of the first conductive part 311 and the third conductive part 313 can be made more stable, and the preparation process of the pole body 310 can be simplified. The third conductive part 313 has a first end face facing away from the first conductive part 311, and the second conductive part 312 has a third end face facing the first conductive part 311, and the first end face is bonded to the third end face to achieve electrical connection. The electrical connection between the second conductive part 312 and the third conductive part 313 is achieved by bonding, which can simplify the assembly process of the second conductive part 312 and the third conductive part 313 and improve the preparation efficiency of the pole 300.

[0161] In some embodiments, the first conductive portion 311 is disposed on the inner side of the first sidewall 110. By disposing the first conductive portion 311 on the inner side of the first sidewall 110, the first conductive portion 311 can be electrically connected to the first connector 400, and the first end surface of the third conductive portion 313 facing away from the first conductive portion 311 and the second conductive portion 312 can be exposed to the housing 100 to achieve electrical connection with other components.

[0162] In other embodiments, the first conductive portion 311 may also be disposed on the outside of the first sidewall 110. By disposing the first conductive portion 311 on the outside of the wall, the second conductive portion 312 and / or the third conductive portion 313 can be electrically connected to the first connector 400, and the first conductive portion 311 is exposed outside the housing 100 to achieve electrical connection with other components.

[0163] See FIG. 12 , which is a schematic structural diagram of a housing of an electrochemical device provided in some embodiments of the present application from one perspective.

[0164] In some embodiments, the first through hole 102 is a circular hole, and the diameter D of the first through hole 102 satisfies 1 mm ≤ D ≤ 10 mm. For example, D may be 1 mm, 5 mm, or 10 mm.

[0165] By setting the first through-hole 102 to be circular, the preparation and formation of the first through-hole 102 can be facilitated, and it is easy to adapt to different sizes of the electrode 300. That is, as long as the size of the portion of the electrode 300 that passes through the first through-hole 102 in the YZ plane is less than or equal to the diameter of the first through-hole 102, the electrode 300 can be installed on the first side wall 110 through the first through-hole 102. By setting the diameter D of the first through-hole 102 to 1 mm to 10 mm, the first through-hole 102 can have sufficient space to allow the electrode 300 to pass through, and when the electrode 300 is installed on the first side wall 110, the edge of the electrode 300 is unlikely to extend beyond the edge of the first side wall 110, which can reduce the possibility of the electrochemical device 10 occupying more space and reduce the possibility of the electrode 300 interfering with other devices (not shown in the figure).

[0166] Referring to Figure 2, in some embodiments, the electrode assembly 200 further includes a second electrode tab 230 having a polarity opposite to that of the first electrode tab 220, and the second electrode tab 230 is disposed on a side of the main body 210 close to the first side wall 110. The electrochemical device 10 further includes a second connector 500, which electrically connects the second electrode tab 230 and the shell 100.

[0167] In some embodiments, the first electrode tab 220 may be a positive electrode tab, and the second electrode tab 230 may be a negative electrode tab.

[0168] The electrode assembly 200 further includes a second electrode tab 230 having an opposite polarity to the first electrode tab 220. The second electrode tab 230 is disposed on a side of the main body 210 near the first sidewall 110, allowing the first electrode tab 220 and the second electrode tab 230 to share the space between the main body 210 and the first sidewall 110. This reduces the space occupied by the first electrode tab 220 and the second electrode tab 230, thereby facilitating an improvement in the energy density of the electrochemical device 10. The electrochemical device 10 further includes a second connector 500, which electrically connects the second electrode tab 230 and the housing 100, enabling the main body 210 to be electrically connected to other devices via the second electrode tab 230, the second connector 500, and the housing 100. This allows other devices electrically connected to the electrode post 300 and the housing 100 to complete an electrical connection circuit with the electrochemical device 10.

[0169] In some embodiments, the second connecting member 500 is U-shaped.

[0170] By configuring the second connector 500 to be U-shaped, it is convenient to connect the second connector 500 to the second electrode tab 230 and the housing 100 respectively after the electrode assembly 200 is installed in the housing 100. Compared with some embodiments, the first connector (not shown in the figure) and the second connector 500 are both configured to be U-shaped. Since part of the pole 300 is accommodated in the accommodating space 101, and the first connector 400 is respectively connected to the pole 300 and the first electrode tab 220, while the second connector 500 is respectively connected to the housing 100 and the second electrode tab 230, in the first direction X, the space occupied by the U-shaped first connector and part of the pole 300 is larger than the space occupied by the U-shaped second connector 500. In the present application, the first connecting member 400 includes a first section 410, a second section 420 and a third section 430, and when observed along the first direction X, the first section 410 and the second section 420 do not overlap, which can reduce the space occupied by the first connecting member 400 and the portion of the electrode 300 in the first direction X, thereby reducing the spacing distance between the main body 210 and the first side wall 110. The accommodating space 101 can have more space for accommodating the electrode assembly 200, which can make the volume of the electrode assembly 200 larger, thereby improving the energy density of the electrochemical device 10.

[0171] The present application provides an electrical device, including the electrochemical device 10 provided in any of the above embodiments, and the electrochemical device 10 is used to provide electrical energy.

[0172] Referring to Figures 13 to 18 and Figure 1, Figure 13 is a flow chart of a method for preparing an electrochemical device provided in some embodiments of the present application; Figure 14 is a stereoscopic schematic diagram of a partial structure of an electrochemical device provided in some embodiments of the present application; Figure 15 is a stereoscopic schematic diagram of a partial structure of an electrochemical device provided in some embodiments of the present application; Figure 16 is a schematic diagram of a partial structure of an electrochemical device provided in some embodiments of the present application from one perspective; Figure 17 is a stereoscopic schematic diagram of a partial structure of an electrochemical device provided in some embodiments of the present application; Figure 18 is a stereoscopic schematic diagram of a partial structure of an electrochemical device provided in some embodiments of the present application.

[0173] The present application provides a method for preparing an electrochemical device, comprising:

[0174] S710 , providing a housing 100 , an electrode assembly 200 , an electrode post 300 and a first connector 400 , wherein a first through hole 102 is provided on a first side wall 110 of the housing 100 .

[0175] In some embodiments, the first through hole 102 may be provided on the first side wall 110 of the housing 100 by laser etching, stamping, or the like.

[0176] S720 , insert the pole 300 through the first through hole 102 .

[0177] In some embodiments, the pole 300 is disposed through the first through hole 102 , that is, the pole 300 is partially located in the accommodating space 101 formed by the housing 100 and partially located outside the housing 100 . In this case, the pole 300 can move relative to the first side wall 110 .

[0178] S730 , connecting the electrode post 300 to the first section 410 of the first connector 400 , and connecting the first electrode tab 220 of the electrode assembly 200 to the second section 420 of the first connector 400 .

[0179] Referring to Figure 14, in some embodiments, the process of connecting the first connecting member 400 to the first pole ear 220 of the electrode assembly 200 is completed outside the shell 100, which facilitates the connection operation between the first connecting member 400 and the first pole ear 200, such as welding operation, and there is no need to reserve welding space for the first connecting member 400 in the accommodating space 101 of the shell 100, thereby reducing the spacing distance between the main body 210 of the electrode assembly 200 and the first side wall 110 of the shell 100.

[0180] S740 , rotating the electrode assembly 200 , the first connecting member 400 , and the electrode post 300 together around the first through hole 102 , so as to install the electrode assembly 200 in the accommodating space 101 of the housing 100 (as shown in FIG. 16 ).

[0181] S750 , fixing the pole 300 to the housing 100 .

[0182] In some embodiments, the pole 300 and the first side wall 110 of the housing 100 may be welded by laser welding.

[0183] After the electrode 300 is connected to the first section 10 of the first connector 400, the first tab 220 of the electrode assembly 200 is connected to the second section 420 of the first connector 400, and then the electrode assembly 200, the first connector 400 and the electrode 300 are rotated together around the first through hole 102 to install the electrode assembly 200 in the accommodating space 101 of the shell 100, that is, before the electrode assembly 200 is installed in the accommodating space 101, the first section 410 of the first connector 400 is connected to the electrode 300, and the second section 420 of the first connector 400 is connected to the electrode 300. The connection with the first pole ear 220 of the electrode assembly 200 makes the connection operation more convenient, and there is no need to reserve part of the accommodating space 101 for connecting the first connecting member 400 and the pole 300, and the first connecting member 400 and the first pole ear 220. Therefore, the space occupied by the first connecting member 400 can be reduced, and the spacing distance between the main body 210 of the electrode assembly 200 and the first side wall 110 can be reduced. The accommodating space 101 can have more space for accommodating the electrode assembly 200, which can make the volume of the electrode assembly 200 larger, thereby improving the energy density of the electrochemical device 10.

[0184] In some embodiments, connecting the electrode post 300 to the first section 410 of the first connector 400 and connecting the first tab 220 of the electrode assembly 200 to the second section 420 of the first connector 400 includes:

[0185] Connect the pole 300 to the first section 410 of the first connector 400 , and ensure that the second section 420 of the first connector 400 is located outside the housing 100 (as shown in FIG. 13 );

[0186] The first electrode tab 220 of the electrode assembly 200 is connected to the second section 420 of the first connector 400 located outside the housing 100 (as shown in FIG. 14 ).

[0187] First, the electrode post 300 is connected to the first section 410 of the first connector 400. Without obstruction by the main body 210 of the electrode assembly 200, the connection operation is more convenient. The second section 420 of the first connector 400 is located outside the housing 100. The first tab 220 of the electrode assembly 200 is connected to the second section 420 of the first connector 400 located outside the housing 100. Without obstruction by other components, the connection operation is more convenient.

[0188] In other embodiments, the first tab 220 of the electrode assembly 200 may be connected to the second section 420 of the first connector 400 first, and then the electrode post 300 may be connected to the first section 410 of the first connector 400 .

[0189] In some embodiments, positioning the second section 420 of the first connector 400 outside the housing 100 includes:

[0190] The angle θ between the length direction of the first connecting member 400 and the edge of the first side wall 110 is set to be 45° to 90° (as shown in FIG15 ). For example, θ can be 45°, 60° or 90°.

[0191] The edge of the first side wall 110 is parallel to the second direction Y.

[0192] By making the second section 420 of the first connecting member 400 located outside the shell 100, the angle between the length direction of the first connecting member 400 and the edge of the first side wall 110 is 45° to 90°, which can facilitate the connection between the second section 420 of the first connecting member 400 and the first pole ear 220 of the electrode assembly 200, and facilitate the rotation of the electrode assembly 200, the first connecting member 400 and the pole 300 together around the first through hole 102 after the second section 420 of the first connecting member 400 is connected to the first pole ear 220, so as to install the electrode assembly 200 in the accommodating space 101 of the shell 100.

[0193] The method for preparing the electrochemical device further comprises:

[0194] S760 , connecting the second connector 500 to the second electrode tab 230 of the electrode assembly 200 and the housing 100 , respectively.

[0195] In some embodiments, the second connector 500 and the second tab 230 , and the second connector 500 and the housing 100 may be connected respectively by welding (as shown in FIG. 17 ).

[0196] S770 , cover the housing cover 600 on the housing 100 (as shown in FIG1 ).

[0197] In some embodiments, the shell cover 600 and the housing 100 may be welded by laser welding, so that the housing 100 and the shell cover 600 together form a closed accommodating space 101 .

[0198] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0199] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. An electrochemical device, characterized in that: include: A housing is formed with an accommodating space, and a first through hole is provided on a first side wall of the housing; An electrode assembly is accommodated in the accommodation space, the electrode assembly comprises a main body and a first electrode tab, and the first electrode tab is arranged on a side of the main body close to the first side wall; A pole, disposed through the first through hole; A first connecting member is disposed in the accommodating space, the first connecting member comprises a first section and a second section, the first section is connected to the first electrode tab, the second section is connected to the electrode column, and the first section and the second section do not overlap when viewed along a first direction, and the first direction is parallel to an arrangement direction of the electrode assembly and the first side wall; In which, the shell also includes a second side wall, the second side wall is connected to the first side wall, the first connecting member includes a first end face and a second end face arranged opposite to each other along the length direction, the distance from the first end face to the center of the pole is smaller than the distance from the second end face to the center of the pole, the distance from the center of the pole to the first end face along the second direction is L1, the distance from the center of the pole to the bottom wall of the shell is L2, and the distance from the center of the pole to the second side wall is L3, satisfying L1≤L2, L1≤L3.

2. The electrochemical device according to claim 1, characterized in that The thickness of the shell is H, satisfying 1 / 2*H≤L2≤H.

3. The electrochemical device according to claim 1, characterized in that A distance L2 from the center of the pole to the bottom wall of the housing and a distance L3 from the center of the pole to the second side wall also satisfy L2=L3.

4. The electrochemical device according to claim 1, characterized in that A distance L3 from the center of the pole to the second side wall satisfies 3mm≤L3≤15mm.

5. The electrochemical device according to claim 1, characterized in that The spacing distance between the main body and the first side wall is S, which satisfies 1.9 mm≤S≤2.05 mm.

6. The electrochemical device according to claim 1, characterized in that The first connecting member further includes a third section, the third section connects the first section and the second section, and the first section and the second section extend from two ends of the third section in opposite directions respectively.

7. The electrochemical device according to claim 6, characterized in that The first section is disposed at an angle to the third section, and the second section is disposed at an angle to the third section.

8. The electrochemical device according to claim 7, characterized in that The angle between the first section and the third section is α, and the angle between the second section and the third section is β, satisfying 45°≤α≤90°, 45°≤β≤90°.

9. The electrochemical device according to claim 7, characterized in that: The third section protrudes from the second section in a direction approaching the first side wall.

10. The electrochemical device according to claim 1, characterized in that The first connecting member is a straight structure.

11. The electrochemical device according to claim 1, characterized in that The thickness of the first connecting member is T, which satisfies 0.05 mm ≤ T ≤ 0.1 mm.

12. The electrochemical device according to claim 1, characterized in that The pole includes a pole body, a connecting plate and a sealing member, wherein the connecting plate is a metal plate, is arranged at the first through hole and is connected to the first side wall, a second through hole is arranged on the connecting plate, the pole body passes through the second through hole, the sealing member is arranged between the connecting plate and the pole body, and the second section is connected to the pole body.

13. The electrochemical device according to claim 12, characterized in that The pole body comprises a first conductive portion, a second conductive portion and a third conductive portion, wherein the first conductive portion is located on a first side of the connecting piece along the thickness direction thereof, the second conductive portion is located on a second side of the connecting piece along the thickness direction thereof opposite to the first side, the third conductive portion is arranged to penetrate the second through hole, and the third conductive portion electrically connects the first conductive portion and the second conductive portion; The sealing member includes a first sealing member and a second sealing member, wherein the first sealing member is disposed between the first conductive portion and the connecting piece, and the second sealing member is disposed between the second conductive portion and the connecting piece.

14. The electrochemical device according to claim 13, characterized in that The first conductive part and the third conductive part are integrally formed, the second conductive part is provided with a plug hole, a part of the third conductive part is plugged into the plug hole, and is electrically connected to the second conductive part in the plug hole.

15. The electrochemical device according to claim 1, characterized in that The diameter D of the first through hole satisfies 1 mm ≤ D ≤ 10 mm.

16. The electrochemical device according to claim 1, characterized in that The electrode assembly further includes a second electrode tab having a polarity opposite to that of the first electrode tab, the second electrode tab being disposed on a side of the main body close to the first side wall, and the electrochemical device further includes a second connector electrically connecting the second electrode tab and the shell.

17. The electrochemical device according to claim 16, characterized in that The second connecting member is U-shaped.

18. An electrical equipment, characterized in that: The electrochemical device according to any one of claims 1 to 17 is used to provide electrical energy.

19. A method for preparing an electrochemical device, characterized in that: include: A shell, an electrode assembly, an electrode column and a first connecting member are provided, wherein a first through hole is provided on a first side wall of the shell; The pole is arranged to pass through the first through hole; Connect the pole to the first section of the first connector, and make the second section of the first connector located outside the shell, and the angle between the length direction of the first connector and the edge of the first side wall is set to be 45° to 90°; Connecting the first electrode tab of the electrode assembly to the second section of the first connecting member; Rotate the electrode assembly, the first connecting member and the pole together around the first through hole to install the electrode assembly in the accommodating space of the shell; The pole is fixed to the housing.

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