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 devices, electrical equipment, and methods for preparing electrochemical devices Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to an electrochemical device, an electrical device, and a method for preparing the electrochemical device. Background Technology

[0002] With the rapid development of new energy technologies, batteries have been widely used in electronic devices, electric vehicles, electric two-wheelers, power tools, and other fields. The requirements for battery energy density are also increasing.

[0003] Currently, electrochemical devices typically include connectors for linking electrode assemblies and electrodes. During the assembly of electrochemical devices, the connection between these connectors and the electrode assemblies and electrodes is complex, affecting the assembly difficulty and preparation efficiency.

[0004] Summary of the Invention

[0005] This application provides an electrochemical device, an electrical device, and a method for preparing the electrochemical device, which can reduce the assembly difficulty of the electrochemical device.

[0006] An electrochemical device comprising:

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

[0008] An electrode assembly is housed within a receiving space. The electrode assembly includes a main body and a first electrode tab, with the first electrode tab disposed on the side of the main body near the first sidewall.

[0009] The pole post is installed through the first through hole;

[0010] The first connector is disposed within the accommodating space. The first connector includes a first segment and a second segment. The first segment is connected to the first electrode tab, and the second segment is connected to the electrode post. When viewed along the first direction, the first segment and the second segment do not overlap. The first direction is parallel to the arrangement direction of the electrode assembly and the first sidewall.

[0011] The housing also includes a second sidewall connected to the first sidewall. The first connector 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 post is less than the distance from the second end face to the center of the pole post. The distance from the center of the pole post to the first end face along the second direction is L1. The distance from the center of the pole post to the bottom wall of the housing is L2. The distance from the center of the pole post to the second sidewall is L3, satisfying L1≤L2 and L1≤L3.

[0012] In the above technical solution, the electrochemical device includes a housing, an electrode assembly, an electrode post, and a first connector. The housing forms an accommodating space to house the electrode assembly and the first connector, thus protecting them. A first through hole is provided on the first sidewall of the housing, through which the electrode post passes. The electrode assembly includes a main body and a first tab, with the first tab located on the side of the main body near the first sidewall. The first connector includes a first segment and a second segment. The first segment connects to the first tab, and the second segment connects to the electrode post, enabling the main body to achieve electrical connection with other devices via the first tab, the first connector, and the electrode post. Viewed along a first direction, the first segment and the second segment do not overlap. The first direction is parallel to the arrangement direction of the electrode assembly and the first sidewall, allowing the first connector to be dimensionally larger in the first direction. The smaller size of the first connector means that it occupies less space in the accommodating space, allowing more room for the electrode assembly. This results in a larger electrode assembly and thus increases the energy density of the electrochemical device. Furthermore, the distances L1 from the center of the electrode post along the second direction to the first end face, L2 from the center of the electrode post to the bottom wall of the housing, and L3 from the center of the electrode post to the second side wall satisfy L1≤L2 and L3≤L3. This ensures that after the first connector is connected to the electrode assembly and electrode post, the first connector is less likely to interfere with the housing during the rotation of the electrode assembly and electrode post into the accommodating space. This facilitates a smooth assembly process for the electrochemical device, simplifies the assembly process, reduces the assembly difficulty, and improves the preparation efficiency of the electrochemical device.

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

[0014] In the above technical solution, by making the thickness H of the shell and the distance L2 from the center of the pole post to the bottom wall of the shell satisfy 1 / 2*H≤L2≤H, the center of the pole post can be far from the bottom wall of the shell. This allows the length of the first connector from the center of the pole post to the first end face of the first connector near the pole post to be set to be larger, which facilitates the connection between the first connector and the pole post. It also allows for a larger space for the rotation of the first connector relative to the shell, 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 post to the bottom wall of the housing and the distance L3 from the center of the pole post to the second side wall also satisfy L2 = L3. It should be noted that tolerances may occur during the manufacturing process, and tolerances within 0.5 mm are considered normal.

[0016] In the above technical solution, by ensuring that the distance L2 from the center of the electrode post to the bottom wall of the shell and the distance L3 from the center of the electrode post to the second side wall also satisfy L2 = L3, it is easy for the first connector to rotate relative to the shell, less likely to interfere with the shell, and the energy density of the electrochemical device can be relatively high. If L2 < L3, since L1 ≤ L2, after the first connector is housed in the accommodating space, the distance between the end face of the first connector connected to the electrode post and the second side wall is relatively large. After the first connector and the electrode assembly rotate relative to the shell and are placed into the accommodating space, there may be a large gap between the electrode assembly and the second side wall, resulting in some space of the accommodating space being wasted and affecting the energy density of the electrochemical device. If L2 > L3, since L1 ≤ L2, L1 may be larger than L3, causing the first connector to interfere with the second side wall during the rotation of the first connector relative to the shell, making it difficult for the first connector and the electrode assembly to be placed into the shell.

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

[0018] In the above technical solution, by ensuring that the distance L3 from the center of the electrode post to the second sidewall satisfies 3mm≤L3≤15mm, sufficient space is reserved between the center of the electrode post and the second sidewall for the first connector to rotate, and the energy density of the electrochemical device can be relatively high. If L3 is too large, after the first connector and the electrode assembly rotate relative to the housing and are placed into the accommodating space, there may be a large gap between the electrode assembly and the second sidewall, resulting in some space of the accommodating space being wasted and affecting the energy density of the electrochemical device. If L3 is too small, the space reserved between the center of the electrode post and the second sidewall is small, and the first connector may interfere with the second sidewall during the rotation of the first connector relative to the housing, making it difficult for the first connector and the electrode assembly to enter the housing, or making the length of the first connector from the center of the electrode post to the end face of the first connector near the electrode post too short, which is not convenient for the first connector to connect with the electrode post.

[0019] In some embodiments, the distance between the main body and the first sidewall is S, which satisfies 1.9mm≤S≤2.05mm.

[0020] In the above technical solution, by ensuring that the distance S between the main body and the first sidewall satisfies 1.9mm≤S≤2.05mm, sufficient space is provided between the main body and the first sidewall to accommodate the first tab, the first connector, and the electrode post. This reduces the likelihood of short circuits between the first connector and the electrode post and the main body. Furthermore, the smaller distance between the main body and the first sidewall allows for more space to accommodate the electrode assembly, resulting in a larger electrode assembly and thus increasing the energy density of the electrochemical device. In some embodiments, the first connector further includes a third segment connecting the first and second segments, with the first and second segments extending in opposite directions from both ends of the third segment.

[0021] In the above technical solution, the first connector also includes a third segment, which connects the first segment and the second segment. The first segment and the second segment extend from the two ends of the third segment in opposite directions, so that the first segment can be fitted and connected to the first electrode tab, and the second segment can be fitted and connected to the electrode post. Furthermore, the first connector does not need to be bent during the assembly process, which reduces the safety risk of short circuit inside the electrochemical device caused by bending the first connector and simplifies the electrode assembly housing process.

[0022] In some embodiments, the first segment and the third segment are set at an angle, and the second segment and the third segment are set at an angle.

[0023] In the above technical solution, since the connection surface between the first electrode tab and the first segment and the connection surface between the electrode post and the second segment are not on the same plane, by setting the first segment and the third segment at an angle, and setting the second segment and the third segment at an angle, it is easier to connect the first segment to the first electrode tab and to the second segment to the electrode post. It also makes the gap between the main body and the first sidewall smaller, and the accommodating space can have more space to accommodate 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, and the angle between the second segment and the third segment is β, satisfying 45°≤α≤90° and 45°≤β≤90°.

[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 is easier to connect the first segment to the first electrode tab and to the second segment to the pole post.

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

[0027] In the above technical solution, since the connection surface between the first electrode tab and the first segment is closer to the first sidewall than the connection surface between the electrode post and the second segment, by making the third segment protrude from the second segment in a direction closer to the first sidewall, that is, the first segment protrudes from the second segment in a direction closer to the first sidewall, it is convenient for the first segment to connect with the first electrode tab and for the second segment to connect with the electrode post. It also makes the gap between the main body and the first sidewall smaller, and the accommodating space can have more space to accommodate 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 connector is a straight structure.

[0029] In the above technical solution, by setting the first connector to a straight structure, the first connector does not need to be bent, which reduces the safety risk of short circuit inside the electrochemical device caused by bending of the first connector, simplifies the casing process, and the first connector has a simple structure and is easy to manufacture.

[0030] In some embodiments, the thickness of the first connector is T, which satisfies 0.05mm≤T≤0.1mm.

[0031] In some embodiments, by setting the thickness T of the first connector to 0.05 mm to 0.1 mm, the first connector can be made stronger and less prone to deformation, thereby making the connection between the first connector and the first tab and electrode post more reliable. The first connector is less likely to damage other internal components of the electrochemical device. Furthermore, the first connector occupies less space in the first direction, which can further reduce the distance between the main body and the first sidewall. The accommodating space can have more space to accommodate the electrode assembly, which can make the electrode assembly larger and thus improve the energy density of the electrochemical device.

[0032] In some embodiments, the electrode post includes an electrode post body, a connecting piece, and a sealing element. The connecting piece is a metal sheet, which is disposed at a first through hole and connected to a first sidewall. A second through hole is provided on the connecting piece, and the electrode post body is disposed through the second through hole. The sealing element is disposed between the connecting piece and the electrode post body, and a second section is connected to the electrode post body.

[0033] In the above technical solution, the electrode post includes an electrode post body, a connecting piece, and a sealing element. The connecting piece is a metal sheet, which is located at the first through hole and connected to the first side wall. This allows the entire electrode post to be directly installed on the first side wall, making the preparation and installation of the electrode post easier and more versatile. The connecting piece has a second through hole through which the electrode post body passes. The sealing element is located between the connecting piece and the electrode post body, with its second section connected to the electrode post body. This allows the sealing element to achieve a seal between the connecting piece and the electrode post body. The connection between the connecting piece and the first side wall enables a seal between the shell and the electrode post, resulting in a better sealing effect for the electrochemical device.

[0034] In some embodiments, the electrode body includes a first conductive part, a second conductive part, and a third conductive part. The first conductive part is located on a first side of the connecting piece along its thickness direction, the second conductive part is located on a second side of the connecting piece along its thickness direction opposite to the first side, and the third conductive part is disposed through a second through hole. The third conductive part is electrically connected to the first conductive part and the second conductive part.

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

[0036] In the above technical solution, the electrode body includes a first conductive part, a second conductive part, and a third conductive part. The first conductive part is located on a first side of the connecting piece along its thickness direction 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 a second side of the connecting piece along its thickness direction opposite to the first side 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 disposed through a second through hole and is electrically connected to the first conductive part and the second conductive part, so that the component electrically connected to the first conductive part and the component electrically connected to the second conductive part can achieve electrical connection. The sealing element includes a first sealing element and a second sealing element. The first sealing element is disposed between the first conductive part and the connecting piece and can achieve sealing between the first conductive part and the connecting piece. The second sealing element is disposed between the second conductive part and the connecting piece and can achieve sealing between the second conductive part and the connecting piece. By providing the first sealing element and the second sealing element, the reliability of the seal between the electrode body and the connecting piece can be improved.

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

[0038] In the above technical solution, by integrally molding 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 is simpler. By providing a plug hole on the second conductive part, a portion of the third conductive part is plugged into the plug hole and electrically connected to the second conductive part in the plug hole. The connection between the second conductive part and the third conductive part can be achieved by plugging, and the second conductive part is less likely to be displaced relative to the third conductive part. The overall structure of the pole body is more stable, and the electrical connection between the second conductive part and the third conductive part is more reliable.

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

[0040] In the above technical solution, by setting the diameter D of the first through hole to 1mm to 10mm, the first through hole can have enough 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 likely to exceed the edge of the first side wall, which can reduce the possibility of the electrochemical device occupying more space and also reduce the possibility of the electrode interfering with other devices.

[0041] In some embodiments, the electrode assembly further includes a second electrode with a polarity opposite to that of the first electrode, the second electrode being disposed on the side of the body near the first sidewall, and the electrochemical device further includes a second connector electrically connecting the second electrode and the housing.

[0042] In the above technical solution, the electrode assembly also includes a second electrode with the opposite polarity to the first electrode. The second electrode is disposed on the side of the main body close to the first sidewall, so that the first electrode and the second electrode can share the space between the main body and the first sidewall, thereby reducing the space occupied by the first electrode and the second electrode and improving the energy density of the electrochemical device. The electrochemical device also includes a second connector, which electrically connects the second electrode and the housing, so that the main body can be electrically connected to other devices through the second electrode, the second connector and the housing, thereby enabling other devices that are electrically connected to the electrode and the housing respectively to form a complete electrical connection circuit with the electrochemical device.

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

[0044] In the above technical solution, by setting the second connector in a U-shape, it is convenient to connect the second connector to the second electrode tab and the housing respectively after the electrode assembly is installed in the housing.

[0045] An electrical device includes an electrochemical device as described above, the electrochemical device being used to provide electrical energy.

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

[0047] The system provides a housing, an electrode assembly, an electrode post, and a first connector, wherein a first through hole is provided on the first side wall of the housing;

[0048] The pole is installed through the first through hole;

[0049] The pole post is connected to the first section of the first connector, and the second section of the first connector is located outside the housing. The angle between the length direction of the first connector and the edge of the first sidewall is set to 45° to 90°.

[0050] Connect the first tab of the electrode assembly to the second segment 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 into the receiving space of the housing;

[0052] Fix the pole to the housing.

[0053] In the above technical solution, the electrode post is first connected to the first section of the first connector. Since there is no main body of the electrode assembly obstructing the connection, the connection operation is relatively convenient. Then, the second section of the first connector is located outside the housing. The first tab of the electrode assembly is connected to the second section of the first connector located outside the housing. Again, there are no other components obstructing the connection, making the connection operation relatively convenient. Next, the electrode assembly, the first connector, and the electrode post are rotated together around the first through hole to install the electrode assembly into the housing's accommodating space. This ensures that before the electrode assembly is installed into the accommodating space, the first section of the first connector is connected to the electrode post, and the second section of the first connector is connected to the first tab of the electrode assembly. This makes the connection operation even more convenient and eliminates the need to reserve space in the accommodating space for connection. The first connector and the electrode post, and the first connector and the electrode tab, can reduce the space occupied by the first connector, reduce the distance between the main body of the electrode assembly and the first sidewall, and allow more space in the accommodating space to accommodate the electrode assembly, thus making the electrode assembly larger and improving the energy density of the electrochemical device. When the second section of the first connector is located outside the housing, the angle between the length direction of the first connector and the edge of the first sidewall is 45° to 90°, which facilitates the connection between the second section of the first connector and the first electrode tab of the electrode assembly. After the second section of the first connector is connected to the first electrode tab, the electrode assembly, the first connector, and the electrode post can rotate together around the first through hole to install the electrode assembly in the accommodating space of the housing. Attached Figure Description

[0054] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings.

[0055] Figure 1 is a three-dimensional structural schematic diagram of an electrochemical device provided in some embodiments of this application;

[0056] Figure 2 is a schematic diagram of the exploded structure of an electrochemical device provided in some embodiments of this application;

[0057] Figure 3 is a structural schematic diagram of the housing and first connector of an electrochemical device provided in some embodiments of this application from one perspective.

[0058] Figure 4 is a three-dimensional structural schematic diagram of the first connector of the electrochemical device provided in some embodiments of this application;

[0059] Figure 5 is a schematic diagram of the structure of an electrochemical device provided in some embodiments of this application from one perspective;

[0060] Figure 6 is a partially enlarged structural diagram of point A in the electrochemical device in Figure 5;

[0061] Figure 7 is a structural schematic diagram of the first connector of an electrochemical device provided in some embodiments of this application from one perspective.

[0062] Figure 8 is a three-dimensional structural schematic diagram of the electrode column of an electrochemical device provided in some embodiments of this application;

[0063] Figure 9 is a schematic diagram of the electrode column of an electrochemical device provided in some embodiments of this application from one perspective.

[0064] Figure 10 is a cross-sectional view of the electrode column of an electrochemical device provided in some embodiments of this application;

[0065] Figure 11 is a schematic diagram of the exploded structure of the electrode column of an electrochemical device provided in some embodiments of this application;

[0066] Figure 12 is a structural schematic diagram of the housing of an electrochemical device provided in some embodiments of this application from one perspective;

[0067] Figure 13 is a schematic flowchart of the preparation method of the electrochemical device provided in some embodiments of this application;

[0068] Figure 14 is a three-dimensional schematic diagram of a partial structure of an electrochemical device provided in some embodiments of this application;

[0069] Figure 15 is a three-dimensional schematic diagram of a partial structure of an electrochemical device provided in some embodiments of this application;

[0070] Figure 16 is a schematic diagram from one perspective of a partial structure of an electrochemical device provided in some embodiments of this application;

[0071] Figure 17 is a three-dimensional schematic diagram of a partial structure of an electrochemical device provided in some embodiments of this application;

[0072] Figure 18 is a three-dimensional schematic diagram of a partial structure of an electrochemical device provided in some embodiments of this application.

[0073] Icons: 10-Electrochemical device; 100-Shell; 101-Accommodation space; 102-First through hole; 110-First sidewall; 120-Second sidewall; 130-Third sidewall; 140-Fourth sidewall; 150-Bottom wall; 200-Electrode assembly; 210-Main body; 211-First side surface; 220-First tab; 230-Second tab; 300-Electrode post; 301-Second through hole; 302-Connection hole; 310-Electrode post body; 311-First conductive part; 312- Second conductive part; 3121-Second end face; 313-Third conductive part; 3131-First part; 3132-Second part; 3133-Stepped surface; 3134-Third end face; 320-Connecting piece; 330-Seal; 331-First seal; 332-Second seal; 400-First connector; 410-First segment; 420-Second segment; 430-Third segment; 500-Second connector; 600-Shell cover; X-First direction; Y-Second direction; Z-Third direction.

[0074] Specific implementation methods

[0075] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application 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 meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having" and any variations thereof in the specification, claims and foregoing description of the drawings are intended to cover non-exclusive inclusion.

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

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

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

[0080] The electrochemical device includes a housing, an electrode assembly, and an electrode post that penetrates the housing. The electrode assembly is disposed inside the housing. One end of the electrode post is electrically connected to the tab of the electrode assembly via a connector, while the other end is exposed outside the housing, so that the main body of the electrode assembly can be electrically connected to other devices through the electrode post.

[0081] With the development of the new energy industry, batteries are gradually moving towards higher energy density and higher power density. However, currently, the connection between the terminals and the tabs of the electrode assembly typically involves first installing the electrode assembly within the housing's accommodating space, and then welding the connectors to the terminals and tabs separately. Therefore, space needs to be reserved between the main body of the electrode assembly and the first sidewall of the housing where the terminals are located to facilitate welding the connectors to the terminals and tabs. However, this results in limited space for accommodating the electrode assembly, affecting the battery's energy density. Furthermore, the need to weld the connectors to the terminals and tabs within a confined space complicates the welding process, increases the difficulty of assembling the electrochemical device, and reduces the fabrication efficiency of the electrochemical device.

[0082] Based on the above considerations, and to address the issue of the high assembly difficulty of electrochemical devices, this application provides an electrochemical device comprising a housing, an electrode assembly, an electrode post, and a first connector. The housing forms an accommodating space, and a first through hole is provided on the first sidewall of the housing. The electrode assembly is housed within the accommodating space and includes a main body and a first tab, with the first tab disposed on the side of the main body near the first sidewall. The electrode post penetrates through the first through hole. The first connector is disposed within the accommodating space and includes a first segment and a second segment, with the first segment connected to the first tab and the second segment connected to the electrode post. The connection, viewed along a first direction, shows that the first segment and the second segment do not overlap, and the first direction is parallel to the arrangement direction of the electrode assembly and the first sidewall. The housing also 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 its length. The distance from the first end face to the center of the electrode post is less than the distance from the second end face to the center of the electrode post. The distance from the center of the electrode post along the second direction to the first end face is L1, the distance from the center of the electrode post to the bottom wall of the housing is L2, and the distance from the center of the electrode post to the second sidewall is L3, satisfying L1≤L2 and L1≤L3. The housing forms an accommodating space that can be used to accommodate the electrode assembly and the first connector, providing protection for both. A first through hole is provided on the first sidewall of the housing, and the electrode post passes through the first through hole. The electrode assembly includes a main body and a first tab. The first tab is located on the side of the main body near the first sidewall. The first connector includes a first segment and a second segment. The first segment is connected to the first tab, and the second segment is connected to the electrode post, enabling the main body to achieve electrical connection with other devices via the first tab, the first connector, and the electrode post. Viewed along a first direction, the first segment and the second segment do not overlap. The first direction is parallel to the arrangement direction of the electrode assembly and the first sidewall, which allows the first connector to be smaller in size in the first direction. The first connector occupies less space in the accommodating space, allowing more space to be used to accommodate the electrode assembly, thus increasing the volume of the electrode assembly and improving the energy density of the electrochemical device. The shortest distance L1 from the center of the electrode post along the second direction to the first end face, the distance L2 from the center of the electrode post to the bottom wall of the shell, and the distance L3 from the center of the electrode post to the second side wall satisfy L1≤L2 and L1≤L3. This ensures that after the first connector is connected to the electrode assembly and the electrode post, the first connector is less likely to interfere with the shell during the process of the electrode assembly and the electrode post rotating together into the accommodating space. This makes the assembly process of the electrochemical device smooth, and this assembly method can simplify the assembly process of the electrochemical device, reduce the assembly difficulty of the electrochemical device, and improve the preparation efficiency of the electrochemical device.

[0083] In this application, the electrochemical device can be a secondary battery or a primary battery. For example, the electrochemical device can be a lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., and the embodiments of this application are not limited in this respect. The electrochemical device can be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited in this respect. The electrode assembly can be a wound structure or a stacked structure, and the embodiments of this application are not limited in this respect.

[0084] This application provides an electrical device that uses an electrochemical device as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0085] The electrochemical devices described in the embodiments of this application are not limited to the electrical equipment described above, but can also be applied to all electrical equipment that uses electrochemical devices.

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

[0087] This application provides an electrochemical device 10, including a housing 100, an electrode assembly 200, an electrode post 300, and a first connector 400. The housing 100 forms an accommodating space 101, and a first through hole 102 is provided on the first sidewall 110 of the housing 100. The electrode assembly 200 is accommodated within the accommodating space 101 and includes a main body 210 and a first tab 220, with the first tab 220 disposed on the side of the main body 210 near the first sidewall 110. The electrode post 300 is disposed through the first through hole 102. The first connector 400 is disposed within the accommodating space 101 and includes a first segment 410 and a second segment 420. The first segment 410 is connected to the first tab 220, and the second segment 420 is connected to the electrode post 300. When viewed along a first direction X, the first segment 410 and the second segment 420 do not overlap, and the first direction X is parallel to the arrangement direction of the electrode assembly 200 and the first sidewall 110. The housing 100 also includes a second sidewall 120, which is connected to the first sidewall 110. The distance from the center of the pole post 300 along the second direction Y to the first end face of the first connector 400 is L1, the distance from the center of the pole post 300 to the bottom wall 150 of the housing 100 is L2, and the distance from the center of the pole post 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 comprises a positive electrode, a negative electrode, and a separator. The housing 100 also serves to contain the electrolyte. The electrochemical device 10 operates primarily by the movement of metal ions between the positive and negative electrode plates. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the portion of the positive current collector without the positive active material layer serves as a positive electrode tab, through which electrical energy is input or output to the positive electrode. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary materials, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the portion of the negative current collector without the negative active material layer serves as a negative electrode tab, through which electrical energy is input or output to the negative electrode. The negative electrode current collector can be made of copper, and the negative electrode active material can be made of carbon or silicon, etc. The separator can be made of polypropylene (PP) or polyethylene (PE), etc. In addition, the electrode assembly can be a wound structure or a stacked structure, and the embodiments of this application are not limited thereto.

[0089] In some embodiments, the main body 210 has a first side surface 211 and a second side surface (not shown in the figure) opposite to the first sidewall 110 along the first direction X. Along the first direction X, the distance between the first side surface 211 and the first sidewall 110 is less than the distance between the second side surface and the first sidewall 110. A first electrode tab 220 is disposed on the side of the main body 210 near the first sidewall 110, that is, the first electrode 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 can be welded together, such as by laser welding. By welding the first segment 410 and the first tab 220 together, the connection force between the first segment 410 and the first tab 220 can be made larger, and the first segment 410 is not easy to detach from the first tab 220.

[0091] In some embodiments, the second segment 420 and the pole post 300 can be welded together, for example, by laser welding. By welding the second segment 420 to the pole post 300, the connection force between the second segment 420 and the pole post 300 can be increased, and the second segment 420 is less likely to detach from the pole post 300.

[0092] In some embodiments, the housing 100 includes a plurality of sidewalls and a bottom wall 150. The plurality of sidewalls include a first sidewall 110, a second sidewall 120, a third sidewall 130, and a fourth sidewall 140. The first sidewall 110 and the third sidewall 130 are disposed opposite to each other, the second sidewall 120 and the fourth sidewall 140 are disposed opposite to each other, the first sidewall 110 is connected to the second sidewall 120 and the fourth sidewall 140 respectively, and the third sidewall 130 is connected to the second sidewall 120 and the fourth sidewall 140 respectively.

[0093] In this embodiment, the first direction X is the length direction of the second sidewall 120, the second direction Y is the length direction of the first sidewall 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 capable of closing the opening formed in the housing 100.

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

[0097] In some embodiments, the housing 100 and the cover 600 may be made of materials such as aluminum, nickel, or stainless steel, which gives the housing 100 and the cover 600 high load-bearing capacity, makes them less prone to rust, and extends their service life.

[0098] In some embodiments, the cover 600 and the housing 100 can be welded together, such as by laser welding. By welding the cover 600 and the housing 100 together, the connection force between the cover 600 and the housing 100 can be increased, and the cover 600 is less likely to detach from the housing 100.

[0099] In some embodiments, the cover 600 and the housing 100 may be made of the same metal material to facilitate welding of the 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 an accommodating space 101, which can be used to accommodate the electrode assembly 200 and the first connector 400, and provides protection for 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 the side of the main body 210 near the first sidewall 110. The first connector 400 includes a first segment 410 and a second segment 420. The first segment 410 is connected to the first tab 220, and the second segment 420 is connected to the electrode post 300, so that the main body 210 can be electrically connected to other devices (not shown in the figure) through the first tab 220, the first connector 400, and the electrode post 300. Viewed along the first direction X, the first segment 410 and the second segment 420 do not overlap. The first direction X is parallel to the arrangement direction of the electrode assembly 200 and the first sidewall 110, which allows the first connector 400 to be smaller in size along the first direction X. The first connector 400 occupies less space in the accommodating space 101, allowing the accommodating space 101 to have more space for accommodating the electrode assembly 200, thus allowing the electrode assembly 200 to have a larger volume and thereby increasing the energy density of the electrochemical device 10; the distance L1 from the center of the electrode post 300 along the second direction Y to the first end face of the first connector 400, the electrode post The distance L2 from the center of electrode 300 to the bottom wall 150 of the housing 100, and the distance L3 from the center of electrode 300 to the second side wall 120, satisfy L1≤L2 and L1≤L3. This ensures that after the first connector 400 is connected to the electrode assembly 200 and electrode 300, during the process of the electrode assembly 200 and electrode 300 rotating together into the accommodating space, the first connector is less likely to interfere with the housing. This makes the assembly process of the electrochemical device 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 post 300 to the bottom wall 150 of the housing 100 satisfy 1 / 2*H≤L2≤H, the center of the pole post 300 can be made farther from the bottom wall 150 of the housing 100. This allows for a larger length of the portion of the first connector 400 from the center of the pole post 300 to the end face of the first connector 400 near the pole post 300. This facilitates the connection between the first connector 400 and the pole post 300 and allows for a larger space for the rotation of the first connector 400 relative to the housing 100, 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 post 300 to the bottom wall 150 of the housing 100 and the distance L3 from the center of the pole post 300 to the second side wall 120 also satisfy L2 = L3. It should be noted that tolerances may occur during the manufacturing process, and tolerances within 0.5 mm are considered normal.

[0104] By ensuring that the distance L2 from the center of the pole post 300 to the bottom wall 150 of the housing 100 and the distance L3 from the center of the pole post 300 to the second side wall 120 also satisfy L2 = L3, it is easy for the first connector 400 to rotate relative to the housing 100, it is not easy to interfere with the housing 100, and it can make the energy density of the electrochemical device 10 larger. If L2 < L3, since L1 ≤ L2, after the first connector 400 is housed in the accommodating space, the distance between the end face of the first connector 400 connected to the electrode post 300 and the second side wall 120 is relatively large. After the first connector 400 and the electrode assembly 200 rotate relative to the housing 100 and are placed into the accommodating space, there may be a large gap between the electrode assembly 200 and the second side wall 120, resulting in some space of the accommodating space being wasted and affecting the energy density of the electrochemical device 10. If L2 > L3, since L1 ≤ L2, L1 may be larger than L3, causing the first connector 400 to interfere with the second side wall 120 during the rotation of the first connector 400 relative to the housing 100, making it difficult for the first connector 400 and the electrode assembly 200 to enter the housing.

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

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

[0107] By ensuring that the distance L3 from the center of the electrode post 300 to the second sidewall 120 satisfies 3mm≤L3≤15mm, sufficient space is reserved between the center of the electrode post 300 and the second sidewall 120 for the first connector 400 to rotate, and the energy density of the electrochemical device 10 is made larger. If L3 is too large, after the first connector 400 and the electrode assembly 200 rotate relative to the housing 100 and are placed into the accommodating space, there may be a large gap between the electrode assembly 200 and the second side wall 120, resulting in some space of the accommodating space being wasted and affecting the energy density of the electrochemical device 10. If L3 is too small, the space reserved from the center of the electrode post 300 to the second side wall 120 will be small, and the first connector 400 may interfere with the second side wall 120 during the rotation of the first connector 400 relative to the housing 100, making it difficult for the first connector 400 and the electrode assembly 200 to enter the housing, or making the length of the first connector 400 from the center of the electrode post 300 to the end face of the first connector 400 near the electrode post 300 small, which is not convenient for the first connector 400 to connect with the electrode post 300.

[0108] Referring to Figures 5 and 6, Figure 5 is a structural schematic diagram of an electrochemical device provided in some embodiments of this application from one perspective; Figure 6 is a partially enlarged structural schematic diagram of point A in the electrochemical device in Figure 5.

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

[0110] By setting the distance between the main body 210 and the first sidewall 110 to S, satisfying 1.9mm≤S≤2.05mm, sufficient space is provided between the main body 210 and the first sidewall 110 to accommodate the first tab 220, the first connector 400, and the electrode post 300. The first connector 400 and the electrode post 300 are less likely to short-circuit with the main body 210. Furthermore, by reducing the distance between the main body 210 and the first sidewall 110, the accommodating space 101 can accommodate more space for the electrode assembly 200, resulting in a larger volume of the electrode assembly 200 and thus improving the energy density of the electrochemical device 10.

[0111] In some embodiments, the end of the first segment 410 may be arc-shaped to facilitate its adaptation and connection with the circular pole post 300, and to make it less likely for the first connector 400 to interfere 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 may be square-shaped to facilitate its adaptation and connection with the first electrode tab 220, thereby increasing the connection area between the second segment 420 and the first electrode tab 220 and increasing the connection strength, making it less likely for the second segment 420 to detach from the first electrode tab 220.

[0113] In some embodiments, the first connector 400 further includes a third segment 430, which connects the first segment 410 and the second segment 420, with the first segment 410 and the second segment 420 extending in opposite directions from both ends of the third segment 430.

[0114] By providing a third segment 430 in the first connector 400, the third segment 430 connects the first segment 410 and the second segment 420. The first segment 410 and the second segment 420 extend from the two ends of the third segment 430 in opposite directions, which facilitates the first segment 410 to be fitted and connected to the first tab 220 and the second segment 420 to be fitted and connected to the electrode post 300. Furthermore, the first connector 400 does not need to be bent during assembly, which reduces the safety risk of short circuit inside the electrochemical device caused by bending the first connector 400 and simplifies the process of housing the electrode assembly 200.

[0115] Referring to Figures 4 and 7, Figure 7 is a structural schematic diagram of the first connector of an electrochemical device provided in some embodiments of this application from one perspective.

[0116] In some embodiments, the first segment 410 and the third segment 430 are set at an angle, and the second segment 420 and the third segment 430 are set at an angle. For example, as shown in Figure 7, 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 surfaces of the first tab 220 and the first segment 410 and the electrode post 300 and the second segment 420 are not on the same plane, by setting the first segment 410 and the third segment 430 at an angle, and the second segment 420 and the third segment 430 at an angle, it is easier to connect the first segment 410 and the first tab 220, and easier to connect the second segment 420 and the electrode post 300. It also makes the gap between the main body 210 and the first sidewall 110 smaller, and the accommodating space 101 can have more space to accommodate the electrode assembly 200, which makes the volume of the electrode assembly 200 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 ensuring that the angle α between the first segment 410 and the third segment 430, and the angle β between the second segment 420 and the third segment 430 satisfy 45°≤α≤90° and 45°≤β≤90°, it is easier to connect the first segment 410 to the first tab 220 and to the second segment 420 to the pole post 300.

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

[0121] Since the connection surface between the first tab 220 and the first segment 410 is closer to the first sidewall 110 than the connection surface between the electrode post 300 and the second segment 420, by making the third segment 430 protrude from the second segment 420 in a direction closer to the first sidewall 110, that is, the first segment 410 protrudes from the second segment 420 in a direction closer to the first sidewall 110, it is easier for the first segment 410 to connect with the first tab 220 and for the second segment 420 to connect with the electrode post 300. It also makes the gap between the main body 210 and the first sidewall 110 smaller, and the accommodating space 101 can have more space to accommodate the electrode assembly 200, which makes the volume of the electrode assembly 200 larger, thereby improving the energy density of the electrochemical device 10.

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

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

[0124] In some embodiments, the third segment 430 can be a straight structure, an arc structure, etc.

[0125] In other embodiments, the first connector 400 has a straight structure.

[0126] By setting the first connector 400 to a straight structure, the first connector 400 does not need to be bent, which reduces the safety risk of internal short circuit of the electrochemical device 10 caused by bending of the first connector 400, simplifies the casing process, and the first connector 400 has a simple structure and is easy to manufacture.

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

[0128] By setting the thickness T of the first connector 400 to 0.05mm to 0.1mm, the first connector 400 can be made stronger and less prone to deformation, thereby making the connection between the first connector 400 and the first tab 220 and the electrode post 300 more reliable. The first connector 400 is less likely to damage other internal components of the electrochemical device 10. Furthermore, the first connector 400 occupies less space in the first direction X, which can further reduce the distance between the main body 210 and the first sidewall 110. The accommodating space 101 can have more space to accommodate the electrode assembly 200, which can make the electrode assembly 200 larger and thus improve the energy density of the electrochemical device 10.

[0129] In some embodiments, the first connector 400 may be made of materials such as steel or nickel, which are not easy to rust, have a long service life, and are easy to weld to the first tab 220 and the pole post 300.

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

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

[0132] The electrode post 300 includes an electrode post body 310, a connecting piece 320, and a sealing element 330. The connecting piece 320 is a metal sheet, located at the first through hole 102 and connected to the first side wall 110. This allows the electrode post 300 to be directly mounted onto the first side wall 110, making its fabrication and installation easier and more versatile. The connecting piece 320 has a second through hole 301 through which the electrode post body 310 passes. The sealing element 330 is located between the connecting piece 320 and the electrode post body 310, with a second section 420 connected to the electrode post body 310. This allows the sealing element 330 to achieve a seal between the connecting piece 320 and the electrode post body 310. The connection between the connecting piece 320 and the first side wall 110 also achieves a seal between the housing 100 and the electrode post 300, resulting in a better sealing effect for the electrochemical device 10.

[0133] In some embodiments, the connecting piece 320 and the first sidewall 110 can be welded together, such as by laser welding. By welding the connecting piece 320 to the first sidewall 110, the sealing performance between the connecting piece 320 and the first sidewall 110 is better, and leakage is less likely to occur. Furthermore, the connection force between the connecting piece 320 and the first sidewall 110 is greater, and the connecting piece 320 is less likely to detach from the housing 100.

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

[0135] In some embodiments, a passivation layer may be formed on the surface of the connecting piece 320, and the seal 330 is bonded to the passivation layer.

[0136] Currently, in electrochemical devices where a seal is directly placed between the electrode body and the housing to form a seal, improving the sealing performance between the seal and the housing requires passivation of the entire housing, which is difficult and costly. In this application, however, only the connecting piece 320 needs passivation, which is less difficult and less costly. By forming a passivation layer on the surface of the connecting piece 320 and bonding the seal 330 to the passivation layer, a bonding bond is formed between the seal 330 and the passivation layer, resulting in a better seal between the seal 330 and the connecting piece 320. Furthermore, the passivation layer slows down the corrosion rate of the connecting piece 320, thereby extending its service life.

[0137] In some embodiments, the electrode body 310 can be made of aluminum, which has the characteristics of oxidation resistance, high voltage bearing capacity, high temperature resistance and electrolyte corrosion resistance.

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

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

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

[0141] The electrode 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 with 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 to the first side and can be used to electrically connect with other devices located on the second side of the connecting piece 320. The third conductive portion 313 is disposed through a second through hole 301 and electrically connects the first conductive portion 311 and the second conductive portion 312, so that the component electrically connected to the first conductive portion 311 and the component electrically connected to the second conductive portion 312 can be electrically connected. 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 can achieve a seal between the first conductive portion 311 and the connecting piece 320. The second sealing element 332 is disposed between the second conductive part 312 and the connecting piece 320, which can realize the sealing between the second conductive part 312 and the connecting piece 320. By providing the first sealing element 331 and the second sealing element 332, the reliability of the seal 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. This allows the width of the first seal 331 and / or the second seal 332 along the direction perpendicular to the centerline of the second through hole 301 (Y or Z) to be set smaller while keeping the total sealing connection area of ​​the first seal 331 and / or the second seal 332 and the connecting piece 320 unchanged. This reduces the overall size of the pole post 300 in the vertical plane (YZ plane) along the centerline of the second through hole 301, making it suitable for thinner housings 100 and further improving the versatility of the pole post 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 part 311 and the third conductive part 313 are integrally formed and disposed, the second conductive part 312 is provided with a plug hole 302, a portion of the third conductive part 313 is plugged into the plug hole 302 and electrically connected to the second conductive part 312 in the plug hole 302.

[0145] By integrally molding 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 becomes more stable, and the electrode body 310 consists of only two parts (one part is composed of the first conductive part 311 and the third conductive part 313, and the other part is the second conductive part 312), which simplifies the manufacturing process of the electrode body 310. By providing a plug hole 302 on the second conductive part 312, a portion of the third conductive part 313 is plugged into the plug hole 302 and electrically connected to the second conductive part 312 within the plug hole 302. This plug-in connection allows the second conductive part 312 and the third conductive part 313 to be connected, making it less likely for the second conductive part 312 to shift relative to the third conductive part 313. The overall structure of the electrode body 310 is more stable, and the electrical connection between the second conductive part 312 and the third conductive part 313 is more reliable.

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

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

[0148] In other embodiments, the first conductive part 311 and the third conductive part 313 can be separately configured and connected by means of plugging, welding or bonding. For example, the first conductive part 311 is provided with a second plug-in hole (not shown in the figure), and part of the third conductive part 313 is plugged into the second plug-in hole and electrically connected to the first conductive part 311 in the second plug-in hole. The connection between the first conductive part 311 and the third conductive part 313 can be realized by plugging, and the first conductive part 311 is less likely to be displaced relative to the third conductive part 313. The overall structure of the pole body 310 is more stable, and the electrical connection between the first conductive part 311 and the third conductive part 313 has high reliability.

[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, the pole body 310 may penetrate the connecting piece 320 and the sealing member 330 from one side, and the second conductive portion 312 may be 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 connected together. 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 stepped surface 3133 is formed between the first portion 3131 and the second portion 3132. The second conductive portion 312 abuts against the stepped surface 3133.

[0151] Wherein, the cross-section of the first part 3131 is the cross-section of the first part 3131 on the plane perpendicular to the thickness direction of the connecting piece 320, and the cross-section of the second part 3132 is the cross-section of the second part 3132 on the 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 the plane perpendicular to the thickness direction of the connecting piece 320 is the YZ plane.

[0153] The third conductive part 313 includes a first part 3131 and a second part 3132 connected together. The first part 3131 is inserted into the insertion hole 302, and the second part 3132 is located between the first part 3131 and the first conductive part 311. The cross-sectional area of ​​the first part 3131 is smaller than that of the second part 3132, so that a stepped surface 3133 is formed between the first part 3131 and the second part 3132. The second conductive part 312 abuts against the stepped surface 3133, which can fix the distance between the second conductive part 312 and the first conductive part 311. When the second conductive part 312 is inserted into the third conductive member 213, it can ensure that the compression of the second conductive part 312 on the first sealing member 331 and the second sealing member 332 is sufficient to achieve a good sealing effect, and can also reduce the possibility that the structure of the first sealing member 331 and the second sealing member 332 will be damaged by excessive compression by the second conductive part 312, thus affecting the sealing effect.

[0154] In other embodiments, the dimensions of the third conductive portion 313 on the plane perpendicular to the thickness direction of the connecting piece 320 (YZ plane) remain unchanged along the thickness direction of the connecting piece 320, which simplifies the manufacturing process of the third conductive portion 313 and the assembly of the seal, connecting piece 320 and the third conductive portion 313.

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

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

[0157] The statement that the third end face 3134 and the fourth end face 3121 are flush can be interpreted broadly. 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 range, and the error range is within 2mm, they 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 post 300 (the side where the third end face 3134 and the fourth end face 3121 are located) is electrically connected to other components by means of 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 post 30 (the side where the third end face 3134 and the fourth end face 3121 are located) is electrically connected to other components by means of bonding, the third end face 3134 can serve as a connection surface.

[0160] In some embodiments, the second conductive part 312 may not have a plug hole. The second conductive part 312 has a third end face (not shown in the figure) facing the first conductive part 311. The third end face is fitted with the third end face 3134 of the third conductive part 313 to achieve electrical connection. By integrally molding 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 manufacturing process of the electrode body 310 is simpler. 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. The first end face and the third end face are fitted to achieve electrical connection. The electrical connection between the second conductive part 312 and the third conductive part 313 is achieved by fitting, which can simplify the assembly process of the second conductive part 312 and the third conductive part 313 and improve the manufacturing efficiency of the electrode 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 face of the third conductive portion 313 facing away from the first conductive portion 311 and the second conductive portion 312 can be exposed outside 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 outer side of the first sidewall 110. By disposing the first conductive portion 311 on the outer side 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] Referring to Figure 12, Figure 12 is a structural schematic diagram of the housing of an electrochemical device provided in some embodiments of this 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 1mm ≤ D ≤ 10mm. For example, D can be 1mm, 5mm or 10mm.

[0165] By making the first through hole 102 circular, it is easier to prepare and shape the first through hole 102, and it is also easier to adapt to electrode posts 300 of different sizes. That is, as long as the size of the portion of the electrode post 300 penetrating 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 post 300 can be installed on the first sidewall 110 through the first through hole 102. By setting the diameter D of the first through hole 102 to 1mm to 10mm, the first through hole 102 has enough space to allow the electrode post 300 to pass through, and when the electrode post 300 is installed on the first sidewall 110, the edge of the electrode post 300 is less likely to exceed the edge of the first sidewall 110, which can reduce the possibility of the electrochemical device 10 occupying more space, and also reduce the possibility of the electrode post 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 230 with the opposite polarity to the first electrode 220. The second electrode 230 is disposed on the side of the body 210 near the first sidewall 110. The electrochemical device 10 also includes a second connector 500, which electrically connects the second electrode 230 and the housing 100.

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

[0168] The electrode assembly 200 also includes a second electrode 230 with the opposite polarity to the first electrode 220. The second electrode 230 is disposed on the side of the main body 210 near the first sidewall 110, so that the first electrode 220 and the second electrode 230 can share the space between the main body 210 and the first sidewall 110, thereby reducing the space occupied by the first electrode 220 and the second electrode 230 and improving the energy density of the electrochemical device 10. The electrochemical device 10 also includes a second connector 500, which electrically connects the second electrode 230 and the housing 100, so that the main body 210 can be electrically connected to other devices through the second electrode 230, the second connector 500 and the housing 100, thereby enabling other devices electrically connected to the electrode post 300 and the housing 100 respectively to form a complete electrical connection circuit with the electrochemical device 10.

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

[0170] By arranging the second connector 500 in a U-shape, it is convenient to connect the second connector 500 to the second tab 230 and the housing 100 respectively after the electrode assembly 200 is installed in the housing 100. Compared with some embodiments where both the first connector (not shown in the figure) and the second connector 500 are arranged in a U-shape, since part of the pole post 300 is accommodated in the accommodating space 101, and the first connector 400 is connected to the pole post 300 and the first tab 220 respectively, while the second connector 500 is connected to the housing 100 and the second tab 230 respectively, in the first direction X, the space occupied by the U-shaped first connector and part of the pole post 300 is greater than the space occupied by the U-shaped second connector 500. In this application, the first connector 400 includes a first segment 410, a second segment 420, and a third segment 430. When viewed along the first direction X, the first segment 410 and the second segment 420 do not overlap, which can reduce the space occupied by the first connector 400 and the electrode post 300 in the first direction X, thereby reducing the distance between the main body 210 and the first sidewall 110. The accommodating space 101 can have more space to accommodate the electrode assembly 200, which can make the electrode assembly 200 larger, thereby improving the energy density of the electrochemical device 10.

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

[0172] Referring to Figures 13 to 18 and Figure 1, Figure 13 is a schematic flowchart of the preparation method of the electrochemical device provided in some embodiments of this application; Figure 14 is a three-dimensional schematic diagram of a partial structure of the electrochemical device provided in some embodiments of this application; Figure 15 is a three-dimensional schematic diagram of a partial structure of the electrochemical device provided in some embodiments of this application; Figure 16 is a schematic diagram of a partial structure of the electrochemical device provided in some embodiments of this application from one perspective; Figure 17 is a three-dimensional schematic diagram of a partial structure of the electrochemical device provided in some embodiments of this application; and Figure 18 is a three-dimensional schematic diagram of a partial structure of the electrochemical device provided in some embodiments of this application.

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

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

[0175] In some embodiments, a first through hole 102 may be provided on the first sidewall 110 of the housing 100 by means of laser etching, stamping or other methods.

[0176] S720, the pole post 300 is set through the first through hole 102.

[0177] In some embodiments, the pole post 300 is disposed through the first through hole 102, so that part of the pole post 300 is located within the accommodating space 101 formed by the housing 100 and part is located outside the housing 100. At this time, the pole post 300 can move relative to the first side wall 110.

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

[0179] Referring to Figure 14, in some embodiments, the process of connecting the first connector 400 to the first tab 220 of the electrode assembly 200 is completed outside the housing 100, which facilitates the connection operation of the first connector 400 and the first tab 200, such as welding operation. It is no longer necessary to reserve welding space for the first connector 400 in the accommodating space 101 of the housing 100, thereby reducing the distance between the main body 210 of the electrode assembly 200 and the first side wall 110 of the housing 100.

[0180] S740, rotate the electrode assembly 200, the first connector 400 and the electrode post 300 together around the first through hole 102 to install the electrode assembly 200 in the receiving space 101 of the housing 100 (as shown in FIG16).

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

[0182] In some embodiments, the pole post 300 and the first sidewall 110 of the housing 100 can be welded by laser welding.

[0183] By connecting the electrode post 300 to the first segment 10 of the first connector 400, and connecting the first tab 220 of the electrode assembly 200 to the second segment 420 of the first connector 400, the electrode assembly 200, the first connector 400, and the electrode post 300 are then rotated together around the first through hole 102 to install the electrode assembly 200 into the receiving space 101 of the housing 100. This ensures that before the electrode assembly 200 is installed into the receiving space 101, the connection between the first segment 410 of the first connector 400 and the electrode post 300, and the connection between the second segment 420 of the first connector 400 and the electrode post 300 are achieved. The connection with the first tab 220 of the electrode assembly 200 is more convenient, and there is no need to reserve part of the accommodating space 101 for connecting the first connector 400 and the electrode post 300, or the first connector 400 and the first tab 220. Therefore, the space occupied by the first connector 400 can be reduced, the distance between the main body 210 of the electrode assembly 200 and the first sidewall 110 can be reduced, and the accommodating space 101 can have more space to accommodate the electrode assembly 200, which can make the electrode assembly 200 larger and thus improve the energy density of the electrochemical device 10.

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

[0185] Connect the pole post 300 to the first segment 410 of the first connector 400, and make the second segment 420 of the first connector 400 located outside the housing 100 (as shown in Figure 13);

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

[0187] First, connect the electrode post 300 to the first segment 410 of the first connector 400. Since there is no obstruction from the main body 210 of the electrode assembly 200, the connection operation is relatively convenient. Then, position the second segment 420 of the first connector 400 outside the housing 100. Connect the first tab 220 of the electrode assembly 200 to the second segment 420 of the first connector 400 located outside the housing 100. Again, there are no other components obstructing the connection, making the connection operation relatively convenient.

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

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

[0190] The angle θ between the length direction of the first connector 400 and the edge of the first sidewall 110 is set to be 45° to 90° (as shown in Figure 15). For example, θ can be 45°, 60° or 90°, etc.

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

[0192] By positioning the second segment 420 of the first connector 400 outside the housing 100, the angle between the length direction of the first connector 400 and the edge of the first sidewall 110 is 45° to 90°. This facilitates the connection between the second segment 420 of the first connector 400 and the first tab 220 of the electrode assembly 200. Furthermore, after the second segment 420 of the first connector 400 is connected to the first tab 220, the electrode assembly 200, the first connector 400, and the electrode post 300 can rotate together around the first through hole 102 to install the electrode assembly 200 within the receiving space 101 of the housing 100.

[0193] The preparation methods of electrochemical devices also include:

[0194] S760, the second connector 500 is connected to the second 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 can be connected by welding (as shown in Figure 17).

[0196] S770, Cover the housing 100 with the cover 600 (as shown in Figure 1).

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

[0198] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0199] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An electrochemical device, characterized in that, include: The housing has an accommodating space, and a first through hole is provided on the first side wall of the housing; An electrode assembly is housed within the accommodating space. The electrode assembly includes a main body and a first electrode tab, wherein the first electrode tab is disposed on the side of the main body near the first sidewall. The pole post is disposed through the first through hole; A first connector is disposed within the accommodating space. The first connector includes a first segment and a second segment. The first segment is connected to the first electrode tab, and the second segment is connected to the electrode post. When viewed along a first direction, the first segment and the second segment 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 disposed opposite to each other along the length direction. The distance from the first end face to the center of the pole post is less than the distance from the second end face to the center of the pole post. The distance from the center of the pole post to the first end face along the second direction is L1. The distance from the center of the pole post to the bottom wall of the housing is L2. The distance from the center of the pole post to the second sidewall is L3, satisfying L1≤L2 and L1≤L3.

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

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

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

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

6. The electrochemical device according to claim 1, characterized in that, 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 from opposite ends of the third segment in opposite directions.

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

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

9. The electrochemical device according to claim 7, characterized in that, The third segment protrudes from the second segment in a direction close to the first sidewall.

10. The electrochemical device according to claim 1, characterized in that, The first connector has a straight structure.

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

12. The electrochemical device according to claim 1, characterized in that, The electrode post includes an electrode post body, a connecting piece, and a sealing element. The connecting piece is a metal sheet, which is disposed at the first through hole and connected to the first side wall. The connecting piece has a second through hole, through which the electrode post body passes. The sealing element is disposed between the connecting piece and the electrode post body, and the second segment is connected to the electrode post body.

13. The electrochemical device according to claim 12, characterized in that, The electrode body includes a first conductive part, a second conductive part, and a third conductive part. The first conductive part is located on a first side of the connecting piece along its thickness direction. The second conductive part is located on a second side of the connecting piece along its thickness direction opposite to the first side. The third conductive part is disposed through the second through hole and is electrically connected to the first conductive part and the second conductive part. The sealing element includes a first sealing element and a second sealing element, wherein the first sealing element is disposed between the first conductive part and the connecting piece, and the second sealing element is disposed between the second conductive part 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 portion of the third conductive part is plugged into the plug hole and 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 1mm≤D≤10mm.

16. The electrochemical device according to claim 1, characterized in that, The electrode assembly further includes a second electrode with a polarity opposite to that of the first electrode, the second electrode being disposed on the side of the main body near the first sidewall, and the electrochemical device further includes a second connector electrically connecting the second electrode and the housing.

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

18. An electrical appliance, characterized in that, Includes the electrochemical device as described in any one of claims 1 to 17, wherein the electrochemical device is used to provide electrical energy.

19. A method for preparing an electrochemical device, characterized in that, include: The system provides a housing, an electrode assembly, an electrode post, and a first connector, wherein a first through hole is provided on the first side wall of the housing; The pole post is disposed through the first through hole; The pole is connected to the first section of the first connector, and the second section of the first connector is located outside the housing. The angle between the length direction of the first connector and the edge of the first sidewall is set to 45° to 90°. Connect the first tab of the electrode assembly to the second segment of the first connector; The electrode assembly, the first connector, and the electrode post are rotated together around the first through hole to install the electrode assembly into the accommodating space of the housing. The pole is fixed to the housing.

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