Search

WO-2025065165-A9 - ELECTROCHEMICAL APPARATUS, ELECTRIC DEVICE, AND PREPARATION METHOD FOR ELECTROCHEMICAL APPARATUS

WO2025065165A9WO 2025065165 A9WO2025065165 A9WO 2025065165A9WO-2025065165-A9

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.

Inventors

  • GAO, CHUNLEI
  • YANG, JIANHUI
  • MA, Wu

Assignees

  • 宁德新能源科技有限公司

Dates

Publication Date
20260507
Application Date
20230925

Claims (19)

  1. An electrochemical device, characterized in that it comprises: 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 is 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 is characterized in that the distance L2 from the center of the electrode post to the bottom wall of the housing and the distance L3 from the center of the electrode post to the second side wall also satisfy L2 = L3.
  4. The electrochemical device according to claim 1 is characterized in that the distance L3 from the center of the electrode post to the second sidewall satisfies 3mm≤L3≤15mm.
  5. The electrochemical device according to claim 1 is 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 is characterized in that the first connector further includes a third segment, the third segment connecting the first segment and the second segment, the first segment and the second segment extending from opposite ends of the third segment respectively.
  7. The electrochemical device according to claim 6 is characterized in that the first segment and the third segment are arranged at an angle, and the second segment and the third segment are arranged at an angle.
  8. The electrochemical device according to claim 7 is 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 is characterized in that the third segment protrudes from the second segment toward the direction close to the first sidewall.
  10. The electrochemical device according to claim 1 is characterized in that the first connecting member has a straight structure.
  11. The electrochemical device according to claim 1 is characterized in that the thickness of the first connector is T, which satisfies 0.05mm≤T≤0.1mm.
  12. According to claim 1, the electrochemical device is 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, the connecting piece is disposed at the first through hole and connected to the first side wall, the connecting piece is provided with a second through hole, 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 the second segment is connected to the electrode post body.
  13. According to claim 12, the electrochemical device is 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 the third conductive part 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 is 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 is characterized in that the diameter D of the first through hole satisfies 1mm≤D≤10mm.
  16. The electrochemical device according to claim 1 is 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 is characterized in that the second connector is U-shaped.
  18. An electrical device, characterized in that it includes an electrochemical device as described in any one of claims 1 to 17, the electrochemical device being used to provide electrical energy.
  19. A method for preparing an electrochemical device, characterized in that it includes: 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.

Description

Electrochemical devices, electrical equipment, and methods for preparing electrochemical devices Technical Field 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 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. 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. Summary of the Invention 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. An electrochemical device comprising: The shell has an accommodating space, and a first through hole is provided on the first side wall of the shell; 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. The pole post is installed through the first through hole; 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. 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. 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. In some embodiments, the thickness of the shell is H, which satisfies 1/2*H≤L2≤H. 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 b