WO2025016142A1 - 电芯壳体、电化学装置及其制备方法、用电设备 - Google Patents

电芯壳体、电化学装置及其制备方法、用电设备 Download PDF

Info

Publication number
WO2025016142A1
WO2025016142A1 PCT/CN2024/100231 CN2024100231W WO2025016142A1 WO 2025016142 A1 WO2025016142 A1 WO 2025016142A1 CN 2024100231 W CN2024100231 W CN 2024100231W WO 2025016142 A1 WO2025016142 A1 WO 2025016142A1
Authority
WO
WIPO (PCT)
Prior art keywords
battery cell
cell shell
side wall
flange
electrochemical device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2024/100231
Other languages
English (en)
French (fr)
Other versions
WO2025016142A9 (zh
Inventor
杨建辉
马武
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ningde Amperex Technology Ltd
Original Assignee
Ningde Amperex Technology Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ningde Amperex Technology Ltd filed Critical Ningde Amperex Technology Ltd
Publication of WO2025016142A1 publication Critical patent/WO2025016142A1/zh
Anticipated expiration legal-status Critical
Publication of WO2025016142A9 publication Critical patent/WO2025016142A9/zh
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present application relates to the field of battery technology, and in particular to a battery cell shell, an electrochemical device and a preparation method thereof, and electrical equipment.
  • the present application provides a battery cell shell, an electrochemical device and a preparation method thereof, and an electrical device, which can effectively improve the energy density of the electrochemical device.
  • the present application provides a battery cell housing, comprising a bottom wall, a side wall and a flange portion, wherein the side wall is arranged around the bottom wall and together with the bottom wall, forms a receiving space having an opening, the flange portion is arranged at an end of the side wall away from the bottom wall, and at least a portion of the flange portion protrudes from an inner surface and/or an outer surface of the side wall;
  • the flange part has a flange surface and a transition surface, the flange surface is roughly perpendicular to the side wall, and is used to connect with the battery cell shell cover; the transition surface is curved to connect the flange surface and the inner surface and/or outer surface of the side wall, the width of the transition surface in the thickness direction of the side wall is W1, and the wall thickness of the side wall is T1, satisfying 0 ⁇ W1 ⁇ T1.
  • the battery cell shell includes a bottom wall, a side wall and a flange portion, the side wall is arranged around the bottom wall, and together with the bottom wall, forms a receiving space with an opening, so that the electrode assembly can be received in the receiving space through the opening;
  • the flange portion is arranged at one end of the side wall away from the bottom wall, and at least a part of the flange portion protrudes from the inner surface and/or outer surface of the side wall, so that the flange portion can be used to connect with the battery cell shell cover and increase the connection area with the battery shell cover;
  • the flange portion has a flange surface and a transition surface, the flange surface is substantially perpendicular to the side wall, and is used to connect with the battery cell shell cover.
  • the transition surface is bent to connect the flange surface and the inner surface and/or outer surface of the side wall.
  • the width of the transition surface in the thickness direction of the side wall is W1
  • the wall thickness of the side wall is T1, which satisfies 0 ⁇ W1 ⁇ T1, so that the width of the flange surface is large, and at the same time, the width of the portion of the flange protruding from the side wall is small, which can make the occupied space of the battery cell shell small, thereby increasing the volume of the accommodation space and the energy density of the electrochemical device, and can make the wall thickness of the side wall small, thereby further increasing the volume of the accommodation space and the energy density of the electrochemical device.
  • W1 is large (for example, greater than T1), it is possible that the width of the flange surface is small or the width of the portion of the flange protruding from the side wall is large.
  • the small width of the flange surface may affect the connection strength between the battery cell shell and the battery cell shell cover, and the large width of the portion of the flange protruding from the side wall may compress the accommodation space and affect the energy density of the electrochemical device.
  • the width of the flange surface can be further made larger, and at the same time, the width of the flange portion protruding from the side wall can be made smaller, thereby further increasing the volume of the accommodating space and increasing the energy density of the electrochemical device, and the wall thickness of the side wall can be further made smaller, thereby increasing the volume of the accommodating space and increasing the energy density of the electrochemical device.
  • a width of the flange surface in a thickness direction of the side wall is W2, satisfying W2 ⁇ 0.7*T1.
  • the connection area between the flange surface and the cell shell cover can be made larger, the connection between the cell shell and the cell shell cover is more stable, the sealing is better, and the electrochemical device is not prone to gaps or separation between the cell shell and the cell shell cover due to force or environmental changes, and the reliability of the electrochemical device is higher.
  • W2 is small (for example, less than 0.7*T1), it may affect the connection strength between the cell shell and the cell shell cover, and thus affect the sealing of the electrochemical device.
  • the flange surface is a plane
  • the transition surface is an arcuate surface
  • the flange surface by setting the flange surface as a plane, the flange surface can be better fitted with the cell cover, so as to facilitate the connection between the flange surface and the cell cover.
  • Setting the transition surface as an arc surface facilitates the preparation of the flange part.
  • At least a portion of the flange protrudes from the outer surface of the side wall, and a width of the portion of the flange protruding from the outer surface of the side wall in the thickness direction of the side wall is W3, satisfying 0.05mm ⁇ W3 ⁇ 0.3mm.
  • the flange portion protrudes from the outer surface of the side wall.
  • the width W3 of the portion of the flange portion protruding from the outer surface of the side wall in the thickness direction of the side wall satisfy 0.05mm ⁇ W3 ⁇ 0.3mm, on the one hand, the width of the flange surface can be made larger, the connection area between the battery shell and the battery shell cover is larger, and the connection strength is better.
  • the space occupied by the portion of the flange portion protruding from the outer surface of the side wall can be reduced, so that the volume of the accommodation space is larger, the volume of the electrode assembly is larger, and the energy density of the electrochemical device is higher when the size of the electrochemical device is constant.
  • W3 is smaller (for example, less than 0.05mm), the width of the flange surface is smaller, the connection area between the battery shell and the battery shell cover is smaller, and the connection strength is lower. When the electrochemical device is subjected to force or the environment changes, a gap or separation may occur between the battery shell and the battery shell cover, affecting the sealing of the electrochemical device. If W3 is larger (for example, greater than 0.3 mm), the portion of the flange protruding from the outer surface of the side wall occupies a larger space, so that when the size of the electrochemical device is constant, the volume of the accommodating space is smaller, the volume of the electrode assembly is smaller, and the energy density of the electrochemical device is also smaller.
  • the space occupied by the portion of the flange protruding from the outer surface of the side wall can be further reduced, so that when the size of the electrochemical device is constant, the volume of the accommodating space is larger, the volume of the electrode assembly is larger, and the energy density of the electrochemical device is higher.
  • At least a portion of the flange protrudes from an outer surface of the side wall, and a thickness of the portion of the flange protruding from the outer surface of the side wall is T2, satisfying 0.7*T1 ⁇ T2 ⁇ 1.1*T1.
  • the thickness T2 of the portion of the flange protruding from the outer surface of the side wall satisfy 0.7*T1 ⁇ T2 ⁇ 1.1*T1
  • the strength of the flange can be relatively large and not easily deformed, and sufficient welding depth can be reserved for the welding connection between the battery shell and the battery shell cover, so that the connection strength between the battery shell and the battery shell cover is relatively large
  • the width of the transition surface can be relatively small, thereby increasing the volume of the accommodation space and increasing the energy density of the electrochemical device. If T2 is relatively small (for example, less than 0.7*T1), the strength of the flange is relatively small, and it may be easily deformed due to force or environmental changes.
  • T2 is relatively large (for example, greater than 1.1*T1), it is not convenient to form a transition surface with a relatively small width, which may affect the volume of the accommodation space and thus affect the energy density of the electrochemical device.
  • 0.05 mm ⁇ T1 ⁇ 0.15 mm In some embodiments of the first aspect, 0.05 mm ⁇ T1 ⁇ 0.15 mm.
  • the strength of the battery cell housing can be made greater, and it is not easy to be deformed or damaged due to force or environmental changes, which can better protect the electrode assembly and maintain the normal operation of the electrochemical device.
  • it can reduce the space occupied by the battery cell housing, and reserve a larger accommodation space when the size of the electrochemical device is constant, so that the volume of the electrode assembly is larger and the energy density of the electrochemical device is higher.
  • T1 is small (for example, less than 0.05mm), the strength of the battery cell housing is small, and it may be deformed or damaged due to force or environmental changes, affecting the protection of the electrode assembly and the normal operation of the electrochemical device. If T1 is large (for example, greater than 0.15mm), the space occupied by the battery cell housing will be larger. When the size of the electrochemical device is constant, the reserved accommodation space will be smaller, so that the volume of the electrode assembly is smaller and the energy density of the electrochemical device is smaller.
  • the space occupied by the battery cell housing can be further reduced.
  • a larger accommodating space is reserved, so that the volume of the electrode assembly is larger and the energy density of the electrochemical device is higher.
  • a thickness of a portion of the flange portion corresponding to the transition surface is T3, satisfying T3>T1.
  • the thickness T3 of the portion of the flange corresponding to the transition surface satisfy T3>T1
  • the connection between the flange and the side wall can be made stronger, the flange is not easily separated from the side wall, and the overall structure of the battery cell housing is more stable.
  • T3 satisfies: T1 ⁇ T3 ⁇ 1.5*T1.
  • the thickness T3 of the flange portion corresponding to the transition surface satisfies T1 ⁇ T3 ⁇ 1.5*T1.
  • T3 satisfies the above conditions to balance the relationship between the firm connection between the flange portion and the side wall in the battery cell shell and the energy density of the battery cell.
  • a thickness of a portion of the flange portion corresponding to the transition surface is T3, satisfying 0.06 mm ⁇ T3 ⁇ 0.2 mm.
  • the thickness T3 of the portion of the flange corresponding to the transition surface satisfies 0.06mm ⁇ T3 ⁇ 0.2mm. If the thickness of the transition surface is too small, it will affect the connection strength of the flange, and if the thickness is too large, it will affect the energy density of the battery cell. It can ensure the connection strength while reducing the energy density loss.
  • a thickness of a portion of the flange portion corresponding to the transition surface is T3, satisfying 0.09 mm ⁇ T3 ⁇ 0.12 mm.
  • the thickness T3 of the portion of the flange portion corresponding to the transition surface satisfies 0.09mm ⁇ T3 ⁇ 0.12mm.
  • the above solution can ensure the connection strength to a greater extent while reducing the energy density loss.
  • the present application provides an electrochemical device, comprising a cell shell, a cell shell cover, and an electrode assembly as described above, wherein the electrode assembly is accommodated in the accommodating space, and the cell shell cover is disposed on the opening.
  • the length of the battery cell shell cover along the first direction is D1
  • the length of the battery cell shell cover along the second direction is D2
  • the length of the battery cell shell along the first direction is D3
  • the length of the battery cell shell along the second direction is D4, satisfying D1 ⁇ D3, D2 ⁇ D4; the first direction, the second direction and the thickness direction of the battery cell shell cover are perpendicular to each other.
  • the connection between the cell shell and the cell shell cover can be facilitated, the connection between the cell shell and the cell shell cover is more stable, and the possibility of the cell shell cover protruding from the cell shell can be reduced, which is beneficial to improving the energy density of the electrochemical device.
  • the lengths of the battery cell shell on both sides along the first direction extending beyond the battery cell shell cover are E1 and E2 respectively
  • the lengths of the battery cell shell on both sides along the second direction extending beyond the battery cell shell cover are E3 and E4 respectively
  • the average value of E1, E2, E3, and E4 is ⁇ E, satisfying ⁇ E ⁇ 0.05mm.
  • the lengths of the cell shell on both sides along the first direction that extend beyond the cell shell cover are E1 and E2 respectively, and the lengths of the cell shell on both sides along the second direction that extend beyond the cell shell cover are E3 and E4 respectively.
  • the average value ⁇ E of E1, E2, E3, and E4 satisfy ⁇ E ⁇ 0.05mm, the length of the portion where the flange surface does not extend beyond the cell shell cover can be made larger, that is, the length of the portion where the flange surface is connected to the cell shell cover is larger, thereby further facilitating the connection between the cell shell and the cell shell cover, making the connection between the cell shell and the cell shell cover more stable, and the sealing of the electrochemical device is better.
  • the electrochemical device is not prone to gaps or separation between the cell shell and the cell shell cover due to force or environmental changes, and the reliability of the electrochemical device is higher. If ⁇ E is larger (for example, greater than 0.05mm), the length of the portion where the flange surface does not extend beyond the cell shell cover is smaller, that is, the length of the portion where the flange surface is connected to the cell shell cover is smaller, which may affect the connection strength between the cell shell and the cell shell cover.
  • the battery cell shell and the battery cell shell cover are welded or adhesively connected.
  • the battery cell shell and the battery cell shell cover are connected by welding or bonding, so that the connection between the battery cell shell and the battery cell shell cover can be stable, the sealing of the electrochemical device is better, and the electrochemical device is not prone to gaps or separation between the battery cell shell and the battery cell shell cover due to force or environmental changes, and the reliability of the electrochemical device is higher.
  • the battery cell shell and the battery cell shell cover are welded to form a welding portion between the battery cell shell and the battery cell shell cover, the depth of the welding portion in the thickness direction of the bottom wall is H, and the width of the welding portion in the thickness direction of the side wall is W4, satisfying H ⁇ 0.5*T1, W4 ⁇ T1.
  • the welding strength between the battery cell shell and the battery cell shell cover can be high, the connection between the battery cell shell and the battery cell shell cover is stable, the sealing of the electrochemical device is good, the electrochemical device is not easy to cause a gap or separation between the battery cell shell and the battery cell shell cover due to force or environmental changes, and the reliability of the electrochemical device is high.
  • H and W4 are small (for example, H is less than 0.5*T1, W4 is less than T1), the welding strength between the battery cell shell and the battery cell shell cover is low, and the electrochemical device may cause a gap or separation between the battery cell shell and the battery cell shell cover due to force or environmental changes, affecting the reliability of the electrochemical device.
  • the battery cell shell and the battery cell shell cover are welded to form a welding portion between the battery cell shell and the battery cell shell cover, the welding portion protrudes from the side of the battery cell shell cover, and the outer surface of the protruding portion is an arc-shaped surface.
  • the welding part is made to protrude from the side of the battery cell cover, so that the volume of the welding part can be larger, the connection strength between the battery cell shell and the battery cell cover is higher, the connection between the battery cell shell and the battery cell cover is stable, the sealing of the electrochemical device is better, and the electrochemical device is not likely to have a gap or separation between the battery cell shell and the battery cell cover due to force or environmental changes, and the reliability of the electrochemical device is higher.
  • the outer surface of the welding part protruding from the battery cell cover is an arc surface, which can reduce the possibility of damage to the welding part and other devices when the welding part interferes with other devices.
  • the present application provides an electrical equipment, including the electrochemical device as described above, and the electrochemical device is used to provide electrical energy.
  • the present application provides a method for preparing an electrochemical device, comprising:
  • the transition surface of the flange of the battery cell shell is turned to the inner side of the battery cell shell by flattening and squeezing the negative angle. Extrusion molding, so that the width W1 of the transition surface in the thickness direction of the side wall of the battery cell shell and the wall thickness T1 of the side wall of the battery cell shell satisfy 0 ⁇ W1 ⁇ T1;
  • the cell shell cover is arranged on the opening of the cell shell, and the cell shell cover is fixedly connected to the cell shell.
  • the width W1 of the transition surface of the battery cell shell in the thickness direction of the side wall of the battery cell shell and the wall thickness T1 of the side wall of the battery cell shell satisfy 0 ⁇ W1 ⁇ T1 by flattening and squeezing negative angles, so that the width of the flange surface of the battery cell shell is larger, and at the same time, the width of the flange portion of the battery cell shell protruding from the side wall is smaller, thereby increasing the volume of the accommodating space and the energy density of the electrochemical device, and the wall thickness of the side wall can be smaller, thereby further increasing the volume of the accommodating space and increasing the energy density of the electrochemical device.
  • a method for fixedly connecting a cell shell cover to a cell shell includes:
  • the battery cell cover is welded to the battery cell shell by means of oscillating welding.
  • the battery cell shell cover is welded to the battery cell shell by oscillating welding, which can further increase the welding strength of the battery cell shell and the battery cell shell cover, so that the connection between the battery cell shell and the battery cell shell cover is firm, the sealing of the electrochemical device is better, and the electrochemical device is not prone to gaps or separation between the battery cell shell and the battery cell shell cover due to force or environmental changes, and the reliability of the electrochemical device is higher.
  • FIG1 is a schematic diagram of a three-dimensional structure of a battery cell housing provided in some embodiments of the present application.
  • FIG2 is a schematic structural diagram of a battery cell housing from one perspective provided in some embodiments of the present application.
  • FIG3 is a schematic cross-sectional view of the battery cell housing shown in FIG2 along the A-A direction;
  • FIG4 is a partially enlarged structural schematic diagram of a portion B of the battery cell housing shown in FIG3 ;
  • FIG5 is a schematic diagram of a three-dimensional structure of an electrochemical device provided in some embodiments of the present application.
  • FIG6 is a schematic diagram of an explosion structure of an electrochemical device provided in some embodiments of the present application.
  • FIG7 is a schematic structural diagram of an electrochemical device provided in some embodiments of the present application from one perspective;
  • FIG8 is a schematic cross-sectional view of the electrochemical device shown in FIG7 along the C-C direction;
  • FIG9 is a schematic diagram of a partially enlarged structure of a portion D of the electrochemical device shown in FIG8 ;
  • FIG10 is a schematic diagram of a partially enlarged structure of a portion D of the electrochemical device shown in FIG8 in another state;
  • FIG. 11 is a schematic flow chart of a method for preparing an electrochemical device provided in some embodiments of the present application.
  • Icons 10-electrochemical device; 100-cell shell; 101-accommodation space; 102-opening; 110-bottom wall; 120-side wall; 121-liquid injection hole; 130-flange; 140-pole; 200-cell shell cover; 210-welding part; 211-bottom surface; 300-electrode assembly; 310-first electrical connector; 320-second electrical connector; X-first direction; Y-second direction; Z-third direction.
  • the terms “installed”, “connected”, “connected”, and “attached” should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements.
  • installed should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements.
  • the battery cell shell generally includes a bottom wall and a side wall.
  • the side wall is arranged around the bottom wall and together with the bottom wall, forms a storage space with an opening, so that the electrode assembly can be accommodated in the storage space through the opening.
  • a battery cell cover needs to be provided on the battery cell shell to cover the opening so that the storage space is isolated from the outside.
  • One is a method of rotary cutting the shell and top welding. Specifically, the battery cell shell is not provided with a flange, the battery cell cover is abutted against the top surface of the side wall of the battery cell shell, and the battery cell cover is welded to the top surface of the side wall.
  • the side wall In order to allow the top surface of the side wall to have sufficient welding area, the side wall needs to have a larger thickness, which will cause the battery cell shell to occupy a larger space, compress the volume of the storage space, reduce the volume of the electrode assembly, and affect the energy density of the electrochemical device.
  • the other is a method of large flange plus top welding, specifically, a flange portion with a larger width is set at one end of the side wall of the battery cell shell away from the bottom wall, and the flange portion protrudes in a direction away from the accommodating space to form a flange surface for connecting with the battery cell shell cover, which can reduce the thickness of the side wall.
  • the flange portion will increase the overall size of the battery cell shell. When the overall size of the battery cell shell remains unchanged, the flange portion will compress the accommodating space, thereby reducing the volume of the electrode assembly and affecting the energy density of the electrochemical device.
  • the present application provides a battery cell shell, which includes a bottom wall, a side wall and a flange portion, wherein the side wall is arranged around the bottom wall and together with the bottom wall forms a accommodating space with an opening, and the flange portion is arranged at one end of the side wall away from the bottom wall, and at least a portion of the flange portion protrudes from the inner surface and/or outer surface of the side wall; wherein the flange portion has a flange surface and a transition surface, the flange surface is roughly perpendicular to the side wall, and is used to be connected to the battery cell shell cover; the transition surface is curved to connect the flange surface and the inner surface and/or outer surface of the side wall, the width of the transition surface in the thickness direction of the side wall is W1, and the wall thickness of the side wall is T1, satisfying 0 ⁇ W1 ⁇ T1.
  • the battery cell shell includes a bottom wall, a side wall and a flange portion, the side wall is arranged around the bottom wall, and together with the bottom wall, forms a storage space with an opening, so that the electrode assembly can be accommodated in the storage space through the opening;
  • the flange portion is arranged at one end of the side wall away from the bottom wall, and at least a part of the flange portion protrudes from the outer surface of the side wall, so that the flange portion can be used to connect with the battery cell shell cover and increase the connection area with the battery shell cover;
  • the flange portion has a flange surface and a transition surface, the flange surface is substantially perpendicular to the side wall, and is used to connect with the battery cell shell cover;
  • the transition surface is curved to connect the flange surface and the inner surface of the side wall, the width of the transition surface in the thickness direction of the side wall is W1, and the wall thickness of the side wall is T1, satisfying 0 ⁇ W1 ⁇ T1,
  • the width of the flange surface may be smaller or the width of the portion of the flange protruding from the side wall may be larger.
  • a smaller width of the flange surface may affect the connection strength between the battery cell shell and the battery cell shell cover, while a larger width of the portion of the flange protruding from the side wall may compress the accommodation space and affect the energy density of the electrochemical device.
  • the present application embodiment provides an electrochemical device including a battery cell housing, the electrochemical device may be a secondary battery or a primary battery, for example, a lithium ion battery, a sodium ion battery, or a magnesium ion battery, etc., which is not limited in the present application embodiment.
  • the electrochemical device may be cylindrical, flat, rectangular, or in other shapes, which is not limited in the present application embodiment.
  • the embodiments of the present application provide an electrical device that uses an electrochemical device as a power source.
  • the electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, and the like.
  • Figure 1 is a schematic diagram of the three-dimensional structure of a battery cell shell provided in some embodiments of the present application
  • Figure 2 is a schematic diagram of the structure of a battery cell shell provided in some embodiments of the present application from one perspective
  • Figure 3 is a schematic diagram of a cross-section of the battery cell shell shown in Figure 2 along the AA direction
  • Figure 4 is a schematic diagram of a partially enlarged structure of the battery cell shell at B shown in Figure 3.
  • the present application provides a battery cell shell 100, the battery cell shell 100 includes a bottom wall 110, a side wall 120 and a flange portion 130, the side wall 120 is arranged around the bottom wall 110, and together with the bottom wall 110, it forms a receiving space 101 with an opening 102, the flange portion 130 is arranged at one end of the side wall 120 away from the bottom wall 110, and at least a portion of the flange portion 130 protrudes from the outer surface of the side wall 120.
  • the flange portion 130 has a flange surface 131 and a transition surface 132, the flange surface 131 is substantially perpendicular to the side wall 120, and is used to connect with the battery cell shell cover 200; the transition surface 132 is curved and connected to the side wall 120.
  • the width of the transition surface 132 connecting the flange surface 131 and the inner surface of the side wall 120 in the thickness direction of the side wall 120 is W1, and the wall thickness of the side wall 120 is T1, which satisfies 0 ⁇ W1 ⁇ T1.
  • the flange surface 131 is substantially perpendicular to the side wall 120 , that is, the difference between the angle between the plane where the flange surface 131 is located and the plane where the outer surface or inner surface of the side wall 120 is located and 90° is within a preset difference range.
  • the battery cell housing 100 can be made of a material with higher strength, such as metal materials such as steel, aluminum alloy, etc., so that the battery cell housing 100 has higher force-bearing performance, thereby making the battery cell housing 100 less likely to be deformed or damaged due to force or environmental changes, thereby making the electrochemical device 10 more reliable.
  • the battery cell casing 100 may also be made of non-metallic materials with relatively high strength, such as carbon fiber, hard plastic, etc.
  • Flange is a part that connects two parts to each other and is used to connect the ends of the parts.
  • Flange connection refers to the detachable connection of a part with a flange and another part as a combined sealing structure. Any connection part that is connected and closed at the same time by a fixed connection around two planes is generally called a "flange".
  • the flange portion 130 is disposed around the side wall 120 and extends in a direction away from the accommodating space 101 , so that at least a portion of the flange portion 130 protrudes from an outer surface of the side wall 120 .
  • the bottom wall 110, the side wall 120 and the flange portion 130 are integrally formed, which can make the overall structure of the battery cell housing 100 stable and prevent gaps or separation between the bottom wall 110 and the side wall 120, or between the side wall 120 and the flange portion 130 due to force or environmental changes, and the battery cell housing 100 has good sealing performance.
  • the bottom wall 110, the side wall 120 and the flange portion 130 may also be separately prepared and formed, and then fixedly connected by welding or bonding.
  • the thickness direction of the sidewall 120 is perpendicular to the third direction Z, and the thickness direction of the sidewall 120 includes a first direction X and a second direction Y.
  • the width of the transition surface 132 of the two parts of the flange portion 130 that are opposite to each other along the first direction X is the size of the transition surface 132 along the first direction X
  • the width of the transition surface 132 of the two parts of the flange portion 130 that are opposite to each other along the second direction Y is the size of the transition surface 132 along the second direction Y.
  • the wall thickness of two opposite parts of the side wall 120 along the first direction X is the dimension of the side wall 120 along the first direction X
  • the wall thickness of two opposite parts of the side wall 120 along the second direction Y is the dimension of the side wall 120 along the second direction Y.
  • the cell housing 100 includes a bottom wall 110, a side wall 120 and a flange 130.
  • the side wall 120 is arranged around the bottom wall 110, and together with the bottom wall 110, it forms a receiving space 101 having an opening 102, so that the electrode assembly 300 can be received in the receiving space 101 through the opening 102.
  • the flange 130 is arranged at one end of the side wall 120 away from the bottom wall 110, and at least a part of the flange 130 protrudes from the outer surface of the side wall 120, so that the flange 130 can be used to connect with the cell housing cover 200, and increase the connection area with the battery housing cover 200.
  • the area of the opening 102 is large, which is convenient for the installation of the electrode assembly 300.
  • the flange portion 130 has a flange surface 131 and a transition surface 132.
  • the flange surface 131 is substantially perpendicular to the side wall 120 and is used to connect with the battery cell shell cover 200.
  • the transition surface 132 is curved to connect the flange surface 131 and the inner surface of the side wall 120.
  • the width of the transition surface 132 in the thickness direction of the side wall 120 is W1, and the wall thickness of the side wall 120 is T1, satisfying 0 ⁇ W1 ⁇ T1.
  • W1 can be 0.5*T1, 0.8*T1 or T1, so that the width of the flange surface 131 is larger, and at the same time, the width of the portion of the flange portion 130 protruding from the side wall 120 is smaller, thereby increasing the volume of the accommodating space 101 and the energy density of the electrochemical device 10, and the wall thickness of the side wall 120 can be smaller, thereby further increasing the volume of the accommodating space 101 and the energy density of the electrochemical device 10.
  • W1 is larger (for example, larger than T1), the width of the flange surface 131 may be smaller or the width of the portion of the flange portion 130 protruding from the side wall 120 may be larger.
  • the smaller width of the flange surface 131 may affect the connection strength between the battery cell housing 100 and the battery cell cover 200.
  • the larger width of the portion of the flange portion 130 protruding from the side wall 120 may compress the accommodating space 101 and affect the energy density of the electrochemical device 10.
  • part of the flange portion 130 may also protrude from the inner surface of the side wall 120, and the transition surface 132 is bent to connect the flange surface 131 and the outer surface of the side wall 120, which can reduce the occupied space of the battery cell housing 100 and is conducive to improving the energy density of the electrochemical device 10.
  • the width W1 of the transition surface 132 in the thickness direction of the side wall 120 and the wall thickness T1 of the side wall 120 satisfy 0 ⁇ W1 ⁇ T1
  • the width of the flange surface 131 is large, and the width of the part of the flange portion 130 protruding from the side wall 120 is small, which facilitates the installation of the electrode assembly 300.
  • the width of the flange surface 131 may be smaller or the width of the portion of the flange portion 130 protruding from the side wall 120 may be larger.
  • the smaller width of the flange surface 131 may affect the connection strength between the battery cell shell 100 and the battery cell shell cover 200.
  • the larger width of the portion of the flange portion 130 protruding from the side wall 120 may affect the installation of the electrode assembly 300, thereby causing the volume of the electrode assembly 300 to be smaller, affecting the energy density of the electrochemical device 10.
  • a portion of the flange portion 130 may be protruded from the inner surface of the side wall 120, and a portion of the flange portion 130 may be protruded from the outer surface of the side wall 120.
  • the flange portion 130 forms two transition surfaces 132, one of which is bent to connect the two transition surfaces 132.
  • the flange surface 131 and the outer surface of the side wall 120, and another transition surface 132 are bent to connect the flange surface 131 and the inner surface of the side wall 120, which can further increase the width of the flange surface 131 and improve the connection strength between the battery cell case 100 and the battery cell case 200.
  • the flange portion 130 occupies less space 101, which is conducive to improving the energy density of the electrochemical device 10.
  • W1 may be 0.7*T1, 0.6*T1 or 0.4*T1, etc.
  • the width of the flange surface 131 can be further increased, and at the same time, the width of the portion of the flange portion 130 protruding from the side wall 120 can be made smaller, thereby further increasing the volume of the accommodating space 101 and increasing the energy density of the electrochemical device 10, and the wall thickness of the side wall 120 can be further made smaller, thereby increasing the volume of the accommodating space 101 and increasing the energy density of the electrochemical device 10.
  • the width of the flange surface 131 in the thickness direction of the side wall 120 is W2, satisfying W2 ⁇ 0.7*T1.
  • W2 may be 0.7*T1, 0.8*T1 or T1.
  • the width of the flange surface 131 of the two parts of the flange portion 130 that are opposite to each other along the first direction X is the size of the flange surface 131 along the first direction X
  • the width of the flange surface 131 of the two parts of the flange portion 130 that are opposite to each other along the second direction Y is the size of the flange surface 131 along the second direction Y.
  • the connection area between the flange surface 131 and the cell shell cover 200 can be made larger, the connection between the cell shell 100 and the cell shell cover 200 is more stable, the sealing is better, and the electrochemical device 10 is not prone to a gap or separation between the cell shell 100 and the cell shell cover 200 due to force or environmental changes, and the reliability of the electrochemical device 10 is higher.
  • W2 is small (for example, less than 0.7*T1), it may affect the connection strength between the cell shell 100 and the cell shell cover 200, and further affect the sealing of the electrochemical device 10.
  • the flange surface 131 is a plane
  • the transition surface 132 is an arc-shaped surface
  • the flange surface 131 is perpendicular to the side wall 120 , that is, the flange surface 131 is perpendicular to the inner surface or the outer surface of the side wall 120 , and the inner surface or the outer surface of the side wall 120 is parallel to the third direction Z.
  • the flange surface 131 is perpendicular to the inner surface or outer surface of the side wall 120, that is, the flange surface 131 is parallel to the X-Y direction, so that the flange surface 131 can be better fitted with the cell shell cover 200, so as to facilitate the connection between the flange surface 131 and the cell shell cover 200.
  • the transition surface 132 is set as an arc surface to facilitate the preparation of the flange part 130.
  • the flange part 130 can be formed by bending the side wall of the cell shell 100.
  • the width of the flange portion 130 protruding from the outer surface of the side wall 120 in the thickness direction of the side wall 120 is W3, satisfying 0.05mm ⁇ W3 ⁇ 0.3mm.
  • W3 may be 0.05mm, 0.1mm or 0.3mm.
  • the width of the portion of the flange portion 130 protruding from the side wall 120 at two portions of the flange portion 130 that are opposite to each other along the first direction X is the size of the portion of the flange portion 130 protruding from the side wall 120 along the first direction X
  • the width of the portion of the flange portion 130 protruding from the side wall 120 at two portions of the flange portion 130 that are opposite to each other along the second direction Y is the size of the portion of the flange portion 130 protruding from the side wall 120 along the second direction Y.
  • the width W3 of the portion of the flange 130 protruding from the outer surface of the side wall 120 in the thickness direction of the side wall 120 satisfy 0.05mm ⁇ W3 ⁇ 0.3mm
  • the width of the flange surface 131 can be made larger, the connection area between the cell housing 100 and the cell cover 200 can be larger, and the connection strength can be better.
  • the space occupied by the portion of the flange 130 protruding from the outer surface of the side wall 120 can be reduced, thereby making the volume of the accommodation space 101 larger, the volume of the electrode assembly 300 larger, and the energy density of the electrochemical device 10 larger when the size of the electrochemical device 10 is constant.
  • W3 is smaller (for example, less than 0.05mm), the width of the flange surface 131 is smaller, the connection area between the cell housing 100 and the cell cover 200 is smaller, and the connection strength is lower.
  • a gap or separation may occur between the cell housing 100 and the cell cover 200, affecting the sealing of the electrochemical device 10.
  • W3 is larger (for example, greater than 0.3 mm)
  • the portion of the flange 130 protruding from the outer surface of the side wall 120 occupies a larger space, so that when the size of the electrochemical device 10 is constant, the volume of the accommodating space 101 is smaller, the volume of the electrode assembly 300 is smaller, and the energy density of the electrochemical device 10 is also smaller.
  • 0.05 mm ⁇ W3 ⁇ 0.15 mm for example, W3 may be 0.05 mm, 0.1 mm, or 0.15 mm.
  • the space occupied by the portion of the flange portion 130 protruding from the outer surface of the side wall 120 can be further reduced, so that when the size of the electrochemical device 10 is constant, the volume of the accommodating space 101 is larger, the volume of the electrode assembly 300 is larger, and the energy density of the electrochemical device 10 is higher.
  • the thickness of the flange portion 130 protruding from the outer surface of the side wall 120 is T2, satisfying 0.7*T1 ⁇ T2 ⁇ 1.1*T1.
  • T2 may be 0.7*T1, 0.9*T1, or 1.1*T1.
  • the thickness of the portion of the flange portion 130 protruding from the outer surface of the side wall 120 is The dimension in the thickness direction (third direction Z) of 110.
  • the thickness direction of the bottom wall 110 is perpendicular to the thickness direction of the side wall 120 .
  • the width W1 of the transition surface 132 can be reduced by cutting.
  • the top surface of the cell housing 100 is cut in a direction perpendicular to the thickness direction of the bottom wall 110 of the cell housing 100 (in a direction parallel to the X-Y plane), which can further reduce the width W1 of the transition surface 132 and increase the width W2 of the flange surface 131.
  • the thickness T2 of the portion of the flange portion 130 protruding from the outer surface of the side wall 120 can also be reduced.
  • the raw material plate can be squeezed toward one end of the side wall 120 of the battery cell shell 100 away from the bottom wall 110 , so that the thickness T2 of the flange portion 130 protruding from the outer surface of the side wall 120 can be greater than the wall thickness T1 of the side wall 120 .
  • the flange 130 can be made stronger and less prone to deformation, and sufficient welding depth can be reserved for the welding connection between the cell housing 100 and the cell shell cover 200, so that the connection strength between the cell housing 100 and the cell shell cover 200 is stronger, and on the other hand, the width of the transition surface 132 can be made smaller, thereby increasing the volume of the accommodating space 101 and the energy density of the electrochemical device 10.
  • T2 is smaller (for example, less than 0.7*T1), the flange 130 is weaker and may be easily deformed due to force or environmental changes, and at the same time, the welding depth between the cell housing 100 and the cell shell cover 200 is limited, which may affect the connection strength between the cell housing 100 and the cell shell cover 200.
  • T2 is relatively large (for example, larger than 1.1*T1), it is not convenient to form a transition surface 132 with a relatively small width, which may affect the volume of the accommodation space 101 and further affect the energy density of the electrochemical device 10 .
  • 0.05 mm ⁇ T1 ⁇ 0.15 mm for example, T1 may be 0.05 mm, 0.09 mm, or 0.15 mm.
  • the strength of the battery cell housing 100 can be relatively large, and it is not easy to be deformed or damaged due to force or environmental changes, which can better protect the electrode assembly 300 and maintain the normal operation of the electrochemical device 10. On the other hand, it can reduce the space occupied by the battery cell housing 100.
  • a larger accommodation space 101 is reserved, so that the volume of the electrode assembly 300 is larger and the energy density of the electrochemical device 10 is higher.
  • T1 is small (for example, less than 0.05mm), the strength of the battery cell housing 100 is small, and it may be deformed or damaged due to force or environmental changes, affecting the protection of the electrode assembly 300 and the normal operation of the electrochemical device 10.
  • T1 is larger (for example, greater than 0.15 mm), the space occupied by the battery cell housing 100 will be larger.
  • the reserved accommodation space 101 will be smaller, so that the volume of the electrode assembly 300 is smaller and the energy density of the electrochemical device 10 is lower.
  • 0.05 mm ⁇ T1 ⁇ 0.1 mm for example, T1 may be 0.05 mm, 0.07 mm, or 0.1 mm.
  • the space occupied by the cell housing 100 can be further reduced.
  • a larger accommodation space 101 is reserved, so that the volume of the electrode assembly 300 is larger and the energy density of the electrochemical device 10 is higher.
  • the thickness of the portion of the flange portion 130 corresponding to the transition surface 132 is T3, satisfying T3>T1.
  • the thickness of the portion of the flange portion 130 corresponding to the transition surface 132 is the dimension of the flange portion 130 in the vertical direction of the transition surface 132.
  • the thickness of a portion of the flange portion 130 corresponding to the transition surface 132 is exemplarily marked in FIG4 .
  • the thickness T3 of the portion of the flange 130 corresponding to the transition surface 132 satisfy T3>T1
  • the connection between the flange 130 and the side wall 120 can be more firmly established, the flange 130 is not easily separated from the side wall 120, and the overall structure of the cell housing 100 is more stable.
  • T3 satisfies: T1 ⁇ T3 ⁇ 1.5*T1.
  • T3 of the portion of the flange portion 130 corresponding to the transition surface 132 satisfy T1 ⁇ T3 ⁇ 1.5*T1
  • T3 satisfies the above conditions to balance the relationship between the firm connection between the flange portion 130 and the side wall 120 in the battery cell shell 100 and the energy density of the battery cell.
  • the thickness of a portion of the flange portion corresponding to the transition surface is T3, satisfying 0.06 mm ⁇ T3 ⁇ 0.2 mm.
  • the thickness T3 of the transition surface corresponding to the flange part is designed to meet 0.06mm ⁇ T3 ⁇ 0.2mm. If the thickness of the transition surface part is too small, it will affect the connection strength of the flange part, and if the thickness is too large, it will affect the energy density of the battery cell. The above scheme can ensure the connection strength while reducing the energy density loss.
  • the thickness of the portion of the flange portion corresponding to the transition surface is T3, satisfying 0.09 mm ⁇ T3 ⁇ 0.12 mm.
  • the connection strength can be guaranteed to a greater extent while reducing the energy density loss.
  • the size of T3 can be 0.09mm, 0.1mm, 0.11mm, The range of any two values within 0.12mm.
  • Figure 5 is a schematic diagram of the three-dimensional structure of an electrochemical device provided in some embodiments of the present application
  • Figure 6 is a schematic diagram of the exploded structure of an electrochemical device provided in some embodiments of the present application.
  • the present application provides an electrochemical device 10, comprising a cell housing 100, a cell housing cover 200, and an electrode assembly 300 according to any of the above schemes, wherein the electrode assembly 100 is accommodated in the accommodation space 101, and the cell housing cover 200 is covered on the opening 102.
  • the battery cell shell cover 200 can be made of a material with higher strength, such as metal materials such as steel, aluminum alloy, etc., so that the battery cell shell 200 has a higher force-bearing performance, and the battery cell shell cover 200 is not easily deformed or damaged due to force or environmental changes, thereby making the electrochemical device 10 more reliable.
  • the cell cover 200 may also be made of non-metallic materials with relatively high strength, such as carbon fiber, hard plastic, etc.
  • the electrochemical device includes a battery housing 100, a battery housing cover 200, an electrode assembly 300 and an electrolyte, and the housing 100 and the battery housing cover 200 are used to accommodate the electrode assembly 300 and the electrolyte.
  • the electrode assembly 300 is composed of a positive electrode sheet, a negative electrode sheet and a separator.
  • the electrochemical device mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work.
  • the positive electrode sheet includes a positive electrode collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode collector.
  • the part of the positive electrode collector that is not coated with the positive electrode active material layer serves as a positive electrode ear to realize the input or output of electrical energy of the positive electrode sheet through the positive electrode ear.
  • the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary material or lithium manganese oxide, etc.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer.
  • the negative electrode active material layer is coated on the surface of the negative electrode current collector.
  • the portion of the negative electrode current collector that is not coated with the negative electrode active material layer serves as a negative electrode tab to realize the input or output of electric energy of the negative electrode sheet through the negative electrode tab.
  • the material of the negative electrode current collector may be copper, and the negative electrode active material may be a carbon material or a silicon material, etc.
  • the material of the isolation film may be polypropylene (PP) or polyethylene (PE), etc.
  • the electrolyte may include an organic solvent, an electrolyte lithium salt, etc.
  • the electrode assembly 300 may be a laminated structure formed by stacking a negative electrode sheet, a separator, and a positive electrode sheet.
  • the electrode assembly 300 may also be a wound structure formed by winding a negative electrode sheet, a separator, and a positive electrode sheet.
  • the electrochemical device 10 is in the shape of a rectangular parallelepiped with rounded corners, so as to better fit into a rounded battery compartment in an electrical device.
  • the top corners of the electrochemical device 10 may also be arranged in a square angle.
  • the thickness direction of the cell housing cover 200 is parallel to the third direction Z, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.
  • a liquid injection hole 121 is provided on the battery housing 100 , which is used to inject electrolyte into the accommodating space 101 through the liquid injection hole 121 after the battery housing 100 and the cell shell cover 200 are assembled, so that the electrolyte can infiltrate the electrode assembly 300 .
  • the injection hole 121 may be disposed on the side wall 120 of the battery housing 100 , so as to facilitate injection of electrolyte into the accommodation space 101 through the injection hole 121 .
  • the electrochemical device 10 further includes an injection plug (not shown in the figure), which is used to seal the injection hole 121 after injecting the electrolyte to achieve sealing of the electrochemical device 10 and reduce the possibility of external water vapor entering the containing space 101 or the electrolyte leaking from the containing space 101.
  • an injection plug (not shown in the figure), which is used to seal the injection hole 121 after injecting the electrolyte to achieve sealing of the electrochemical device 10 and reduce the possibility of external water vapor entering the containing space 101 or the electrolyte leaking from the containing space 101.
  • the injection hole 121 may be a circular hole, which facilitates the injection of electrolyte through the injection hole 121 and also facilitates the sealing of the injection hole 121 by an injection plug, thereby reducing the possibility of electrolyte leakage.
  • the injection hole 121 may also be a square hole, a special-shaped hole, etc.
  • the electrochemical device 10 further includes a first electrical connector 310 and a second electrical connector 320.
  • the battery housing 100 is provided with a pole 140 that penetrates the battery housing 100.
  • One end of the first electrical connector 310 is electrically connected to the positive electrode tab on the positive electrode sheet, and the other end is electrically connected to the pole 140, so that an external device can be electrically connected to the positive electrode sheet through the pole 140 and the first electrical connector 310.
  • One end of the second electrical connector 320 is electrically connected to the negative electrode tab on the negative electrode sheet, and the other end is electrically connected to the battery housing 100, so that an external device can be electrically connected to the negative electrode sheet through the housing 100 and the second electrical connector 320.
  • the electrochemical device 10 further includes a first electrical connector 310 and a second electrical connector 320
  • the battery housing 100 is provided with two poles 140 penetrating the battery housing 100, one end of the first electrical connector 310 is electrically connected to the positive electrode sheet, and the other end is electrically connected to one of the poles 140, so that an external device can be electrically connected to the positive electrode sheet through the pole 140 and the first electrical connector 310.
  • One end of the second electrical connector 320 is electrically connected to the negative electrode sheet, and the other end is electrically connected to the other pole 140, so that an external device can be electrically connected to the negative electrode sheet through the pole 140 and the second electrical connector 320.
  • first electrical connector 310 and the positive electrode tab may be welded, and the second electrical connector 320 and the negative electrode tab may be welded.
  • the pole tabs can be connected by welding.
  • first electrical connector 310 and the positive electrode tab may be integrally formed
  • second electrical connector 320 and the negative electrode tab may be integrally formed
  • the first electrical connector 310 and the second electrical connector 320 may be made of a material with good electrical conductivity, such as a metal material such as lead or copper.
  • the pole 140 is elliptical in shape, and when the thickness of the battery cell housing 100 is limited, the cross-sectional area of the pole 140 (the cross-sectional area of the pole 140 on the X-Z plane) can be increased, thereby increasing the connection area between the pole 140 and the second electrical connector 310 and the external device, and improving the connection reliability between the pole 140 and the second electrical connector 310 and the external device.
  • the pole 140 may also be arranged in a circular or square shape.
  • the pole 140 may be made of a material with good electrical conductivity, such as a metal material such as lead or copper.
  • the terminal post 140 may be disposed on the side wall 120 of the battery housing 100 to facilitate electrical connection of the terminal post 140 to an external device.
  • the projection of the injection hole 121 along the second direction Y does not overlap with the projection of the first electrical connector 310 and the second electrical connector 320 along the second direction Y, which can reduce the impact of the injection hole 121 on the electrical connection between the first electrical connector 310 and the pole 140 and the electrical connection between the second electrical connector 320 and the battery cell housing 100.
  • the injection hole 121 and the pole 140 may be disposed on the same side of the side wall 120 to facilitate the preparation of the battery cell housing 100 .
  • the injection hole 121 and the pole 140 may be disposed on different sides of the side wall 120 .
  • Figure 7 is a schematic structural diagram of an electrochemical device provided by some embodiments of the present application from one perspective.
  • the length of the cell shell cover 200 along its first direction X is D1
  • the length of the cell shell cover 200 along the second direction Y is D2
  • the length of the cell housing 100 along the first direction X is D3
  • the length of the cell housing 100 along the second direction Y is D4, satisfying D1 ⁇ D3, D2 ⁇ D4.
  • the cell cover 200 may be a plate-shaped structure, so that the cell cover 200 can cover the open side of the cell casing 100 , and the cell casing 100 and the cell cover 200 together define a receiving space 101 .
  • the connection between the cell housing 100 and the cell shell cover 200 can be facilitated, the connection between the cell housing 100 and the cell shell cover 200 can be made more stable, and the possibility of the cell shell cover 200 protruding from the cell housing 100 can be reduced, which is beneficial to improving the energy density of the electrochemical device 10.
  • the size of the battery cell shell cover 200 slightly smaller than the size of the battery cell shell 100, the battery cell shell cover 200 can be firmly connected to the battery cell shell 100 while reducing the possibility of the battery cell shell cover 200 protruding from the battery cell shell 100 after the battery cell shell cover 200 and the battery cell shell 100 are assembled, thereby reducing the possibility of increasing the overall size of the electrochemical device 10 due to the assembly of the battery cell shell cover 200, which is beneficial to improving the energy density of the electrochemical device 10.
  • Figure 8 is a schematic cross-sectional view of the electrochemical device shown in Figure 7 along the C-C direction
  • Figure 9 is a partially enlarged structural schematic view of the electrochemical device at D shown in Figure 8.
  • the lengths of the battery cell housing 100 on both sides along the first direction X that extend beyond the battery cell cover 200 are E1 and E2, respectively
  • the lengths of the battery cell housing 100 on both sides along the second direction Y that extend beyond the battery cell cover 200 are E3 and E4, respectively
  • the average values of E1, E2, E3, and E4 are ⁇ E, satisfying ⁇ E ⁇ 0.05mm, for example, ⁇ E can be 0.05mm, 0.04mm, or 0.03mm, etc.
  • a dimension E1 of one side of the cell housing 100 along the first direction X that exceeds the cell housing cover 200 is schematically indicated, and other dimensions such as E2, E3, and E4 are similar to E1 and are not indicated in the figure.
  • the lengths of the cell shell 100 on both sides along the first direction X that extend beyond the cell shell cover 200 are E1 and E2, respectively.
  • the lengths of the cell shell 100 on both sides along the second direction Y that extend beyond the cell shell cover 200 are E3 and E4, respectively.
  • the length of the portion where the flange surface 131 does not extend beyond the cell shell cover 200 can be made larger, that is, the length of the portion where the flange surface 131 is connected to the cell shell cover 200 is larger, thereby further facilitating the connection between the cell shell 100 and the cell shell cover 200, making the connection between the cell shell 100 and the cell shell cover 200 more stable, and the sealing of the electrochemical device 10 is better.
  • the electrochemical device 10 is not prone to gaps or separation between the cell shell 100 and the cell shell cover 200 due to force or environmental changes, and the reliability of the electrochemical device 10 is higher.
  • ⁇ E is larger (for example, greater than 0.05 mm)
  • the length of the portion of the flange surface 131 that does not extend beyond the cell cover 200 is smaller, that is, the length of the portion where the flange surface 131 is connected to the cell cover 200 is smaller, which may affect the connection strength between the cell housing 100 and the cell cover 200.
  • both sides of the cell casing 100 along the first direction X and both sides of the cell casing 100 along the second direction Y may extend beyond the cell casing cover 200 .
  • the side of the cell case 100 may also be aligned with the cell cover 200, or the side of the cell cover 200 may also exceed the cell case 100.
  • E1 is a negative number.
  • the four sides of the cell cover 200 can be made not to exceed the cell case 100 too much, thereby reducing the overall occupied space of the cell case 100 and the cell cover 200, which is conducive to improving the energy density of the electrochemical device 10.
  • E1 ⁇ 0.05mm, E2 ⁇ 0.05mm, E3 ⁇ 0.05mm, E4 ⁇ 0.05mm which can make the length of the portion where the flange surface 131 is connected to the battery cell shell 100 larger, and the battery cell shell cover 200 is firmly connected to the battery cell shell 100, while reducing the possibility that the battery cell shell cover 200 protrudes from the battery cell shell 100 after the battery cell shell cover 200 and the battery cell shell 100 are assembled, thereby reducing the possibility of increasing the overall size of the electrochemical device 10 due to the assembly of the battery cell shell cover 200, which is beneficial to improving the energy density of the electrochemical device 10.
  • the cell shell cover 200 may also be a hollow structure with an opening on one side, and the opening side of the cell shell cover 200 covers the opening side of the cell housing 100 to form a receiving space 101.
  • the cell shell cover 200 may also be provided with a flange portion (not shown in the figure), and the structure of the flange portion of the cell shell cover 200 is similar to that of the flange portion 130 of the cell housing 100, which will not be described in detail here.
  • the flange portion of the cell shell cover 200 can cooperate with the flange portion 130 of the cell housing 100 to achieve connection.
  • the cell casing 100 and the cell cover 200 may be connected by welding.
  • the connection between the cell shell 100 and the cell shell cover 200 can be made stable, the sealing of the electrochemical device 10 is better, and the electrochemical device 10 is not prone to a gap or separation between the cell shell 100 and the cell shell cover 200 due to force or environmental changes, and the reliability of the electrochemical device 10 is higher.
  • the cell casing 100 and the cell casing cover 200 may also be connected by bonding.
  • FIG. 10 is a partially enlarged structural schematic diagram of the electrochemical device at D in another state shown in Figure 8.
  • the battery cell housing 100 and the battery cell cover 200 are welded, and a welding portion 210 is formed between the battery cell housing 100 and the battery cell cover 200.
  • the depth of the welding portion 210 in the thickness direction of the bottom 110 wall is H
  • the width of the welding portion 210 in the thickness direction of the side wall 120 is W4, satisfying H ⁇ 0.5*T1, W4 ⁇ T1, for example, H can be 0.5*T1, 0.8*T1 or T1, etc.
  • W4 can be T1, 1.2*T1 or 1.4*T1, etc.
  • the welding method of the cell shell 100 and the cell shell cover 200 can be laser welding, that is, the laser penetrates the cell shell cover 200 to reach the cell shell 100, melts the connection between the cell shell 100 and the cell shell cover 200, and forms a welding portion 210.
  • the depth of the welding portion 210 is the dimension of the welding portion 210 in the third direction Z
  • the width of the welding portion 210 is the dimension of the welding portion 210 in the direction perpendicular to the third direction Z (including the first direction X and the second direction Y).
  • the width of two portions of the welding portion 210 opposite to each other along the first direction X is the dimension of the welding portion 210 along the first direction X
  • the width of two portions of the welding portion 210 opposite to each other along the second direction Y is the dimension of the welding portion 210 in the second direction Y.
  • the welding portion formed between the battery cell shell 100 and the battery cell shell cover 200 is formed in the opposite direction of the third direction Z, and the width of the welding portion in the opposite direction of the third direction Z gradually decreases, and its welding width is the width of the cross section of the welding portion on the plane where the top surface of the battery cell shell 100 (the end surface of the side wall 120 or the flange portion away from the bottom wall 110) is located, which can reach 1/4 of the wall thickness T1 of the side wall of the battery cell shell 100. Therefore, the welding width is small, resulting in a small welding strength between the battery cell shell 100 and the battery cell shell cover 200.
  • the electrochemical device 10 may cause a gap or separation between the battery cell shell 100 and the battery cell shell cover 200 due to force or environmental changes, affecting the reliability of the electrochemical device 10.
  • the welding portion formed between the battery cell shell 100 and the battery cell shell cover 200 is formed in the opposite direction of the third direction Z, and the width of the welding portion in the opposite direction of the third direction Z gradually decreases, and its welding width is the width of the cross section of the welding portion on the plane where the top surface of the battery cell shell 100 (the end surface of the side wall 120 or the flange portion away from the bottom wall 110) is located, which can reach 1/2 of the wall thickness T1 of the side wall of the battery cell shell 100.
  • the smaller the welding width the smaller the welding strength between the battery cell shell 100 and the battery cell shell cover 200.
  • the electrochemical device 10 may cause a gap or separation between the battery cell shell 100 and the battery cell shell cover 200 due to force or environmental changes, thereby affecting the reliability of the electrochemical device 10.
  • the welding strength of the battery cell housing 100 and the battery cell shell cover 200 can be high, the connection between the battery cell housing 100 and the battery cell shell cover 200 is stable, the sealing of the electrochemical device 10 is good, and the electrochemical device 10 is not easy to cause a gap or separation between the battery cell housing 100 and the battery cell shell cover 200 due to force or environmental changes, and the reliability of the electrochemical device 10 is high.
  • H and W4 are small (for example, H is less than 0.5*T1, W4 is less than T1), the battery cell housing 100
  • the welding strength between the cell case 100 and the cell case cover 200 is low, and the electrochemical device 10 may have a gap or separation between the cell case 100 and the cell case cover 200 due to force or environmental changes, which affects the reliability of the electrochemical device 10 .
  • a portion of the welding portion 210 protrudes from a side of the cell case cover 200 , and an outer surface of the protruding portion is an arc-shaped surface.
  • the welding portion 210 is formed between the battery cell shell 100 and the battery cell shell cover 200, and is located inside the battery cell shell 100 and the battery cell shell cover 200, that is, spaced from the side of the battery cell shell 100 and the battery cell shell cover 200.
  • the volume of the welding portion 210 is small, so that the connection strength between the battery cell shell 100 and the battery cell shell cover 200 is low.
  • part of the welding portion 210 is protruded from the side of the battery cell shell cover 200, so that the volume of the welding portion 210 can be larger, the connection strength between the battery cell shell 100 and the battery cell shell cover 200 is higher, the connection between the battery cell shell 100 and the battery cell shell cover 200 is firm, the sealing of the electrochemical device 10 is better, and the electrochemical device 10 is not prone to gaps or separation between the battery cell shell 100 and the battery cell shell cover 200 due to force or environmental changes, and the reliability of the electrochemical device 10 is higher.
  • a portion of the welding portion 210 may also protrude from the sides of the cell casing 100 and the cell cover 200 at the same time.
  • the outer surface of the portion of the welding portion 210 protruding from the cell case cover 200 has edges and corners, when the welding portion 210 interferes with other devices, the welding portion 210 is prone to stress concentration and damage, and is prone to damage other devices.
  • the outer surface of the portion of the welding portion 210 protruding from the cell case cover 200 is an arc-shaped surface, which can reduce the possibility of damage to the welding portion 210 and other devices when the welding portion 210 interferes with other devices.
  • T1 is the wall thickness of the side wall of the battery cell shell
  • W1 is the width of the transition surface of the battery cell shell
  • W2 is the width of the flange surface of the battery cell shell
  • W3 is the width of the flange portion of the battery cell shell protruding from the outer surface of the side wall
  • T2 is the thickness of the flange portion of the battery cell shell protruding from the outer surface of the side wall
  • T3 is the thickness of the battery cell shell cover
  • Q1 is the energy density improvement rate of Comparative Example 2 and Examples 1-13 compared with Comparative Example 1
  • Q2 is the welding strength improvement rate of Comparative Example 2 and Examples 1-13 compared with Comparative Example 1
  • Q3 is the welding strength improvement value of Comparative Example 2 and Examples 1-13 compared with Comparative Example 1.
  • the units of thickness and width of each part are mm, and the unit of welding strength value is N/mm.
  • the battery cell shell is not provided with a flange, and the battery cell shell cover is straight
  • the battery cell housing is provided with a flange portion, but the flange portion is not processed.
  • the method for measuring the welding strength of battery cell shells is as follows: cut the welded battery cell shells to a predetermined width S in the vertical direction of the weld, fold the sample into a T shape, and use a high-speed rail tensile testing machine to pull the metal parts at both ends of the weld apart.
  • the maximum tensile force value measured is F
  • the welding strength is: F/S.
  • the wall thickness T1 of the cell housing can be reduced, and the energy density of the electrochemical device and the welding strength between the cell housings can be improved.
  • the width W1 of the transition surface of the cell shell remains unchanged, the width W2 of the flange surface of the cell shell, and the width W3 of the portion of the flange portion of the cell shell protruding from the outer surface of the side wall are increased, which can reduce the wall thickness T1 of the cell shell, thereby improving the energy density of the electrochemical device.
  • the width W1 of the transition surface of the cell shell remains unchanged, the thickness T2 of the flange portion of the cell shell protruding from the outer surface of the side wall remains unchanged, the width W2 of the flange surface of the cell shell increases, but the wall thickness T1 of the cell shell decreases, which will have a greater impact on the welding strength between the cell shells.
  • T1 is the thickness of the side wall of the cell housing (in the comparative examples and embodiments tested, the thickness of the bottom wall of the cell housing is equal to the thickness of the side wall)
  • T3 is the thickness of the cell housing cover
  • W3 is the protrusion of the flange of the cell housing from the side wall.
  • the width of the outer surface of the battery case is 1.
  • Comparative Example 1 is a method in which the battery case is not provided with a flange portion, and the battery case cover is directly connected to the top surface of the side wall of the battery case.
  • Comparative Example 2 is a method in which the battery case is provided with a flange portion, but the flange portion is not processed.
  • Example 4 is the electrochemical device of Example 4 in Table 1.
  • the width W3 of the flange portion of the battery case protruding from the outer surface of the side wall is equal in Example 4, the wall thickness T1 of the side wall of the battery case is smaller, and the welding strength of the electrochemical device is greatly improved. Specifically, the welding strength is increased by 43.87% on average. At the same time, combined with Table 1, the energy density of the electrochemical device is also increased by 2.26%.
  • the wall thickness T1 of the side wall of the battery case is equal in Example 4, and the width W3 of the flange portion of the battery case protruding from the outer surface of the side wall is smaller.
  • the welding strength of the electrochemical device is greatly improved. Specifically, the welding strength is increased by 30.15% on average. At the same time, combined with Table 1, the energy density of the electrochemical device is also increased by 2.2%.
  • the embodiments provided in the present application can increase the volume of the accommodation space, increase the energy density of the electrochemical device, and also enable the battery cell shells to have a higher welding strength.
  • An embodiment of the present application provides an electrical device, including an electrochemical device 10 according to any of the above solutions, and the electrochemical device 10 is used to provide electrical energy to the electrical device.
  • the electrical equipment may be any of the aforementioned equipment or systems using the electrochemical device 10 .
  • FIG. 11 is a schematic flow chart of a method for preparing an electrochemical device provided in some embodiments of the present application.
  • the method for preparing an electrochemical device comprises:
  • the raw material plate may be a steel plate or other metal plates.
  • the transition surface of the flange portion of the cell shell is extruded toward the inner side of the cell shell by flattening and squeezing a negative angle, so that the width W1 of the transition surface in the thickness direction of the side wall of the cell shell and the wall thickness T1 of the side wall of the cell shell satisfy 0 ⁇ W1 ⁇ T1.
  • the transition surface of the flange portion of the cell shell may be extruded toward the inner side of the cell shell only by flattening it, or the transition surface of the flange portion of the cell shell may be extruded toward the inner side of the cell shell only by extruding a negative angle.
  • the flange portion of the cell case may be processed after stamping so that the width W1 of the transition surface in the thickness direction of the side wall of the cell case and the wall thickness T1 of the side wall of the cell case satisfy 0 ⁇ W1 ⁇ T1.
  • the first electrical connector of the electrode assembly is connected to the pole of the battery cell shell, and the second electrical connector of the electrode assembly is connected to the battery cell shell to achieve installation of the electrode assembly.
  • electrolyte needs to be injected into the accommodating space of the cell shell through the injection hole of the cell shell, and the injection hole is sealed. After the electrolyte infiltrates the electrode assembly, the electrochemical device can work normally.
  • the width W1 of the transition surface of the cell shell in the thickness direction of the side wall of the cell shell and the wall thickness T1 of the side wall of the cell shell are made to satisfy 0 ⁇ W1 ⁇ T1 by flattening and squeezing negative angles, so that the width of the flange surface of the cell shell is larger, and at the same time, the width of the portion of the flange of the cell shell protruding from the side wall is smaller, thereby increasing the volume of the accommodation space and the energy density of the electrochemical device, and the wall thickness of the side wall is smaller, thereby further increasing the volume of the accommodation space and the energy density of the electrochemical device.
  • W1 is larger (for example, larger than T1), it may cause the width of the flange surface to be smaller or the width of the portion of the flange protruding from the side wall to be larger.
  • the smaller width of the flange surface may affect the connection strength between the cell shell and the cell shell cover, and the larger width of the portion of the flange protruding from the side wall may compress the accommodation space and affect the energy density of the electrochemical device.
  • the method of fixedly connecting the battery cell cover to the battery cell shell includes: welding the battery cell cover to the battery cell shell by swing welding.
  • Oscillating welding is to make the laser swing back and forth to form a weld extending along a curve between the battery cell shell and the battery cell cover, which can increase the area of the weld.
  • Line welding is to move the laser in a straight line to form a welding portion extending in a straight line between the cell case and the cell cover.
  • the width W1 of the transition surface of the battery cell shell in the thickness direction of the side wall of the battery cell shell and the wall thickness T1 of the side wall of the battery cell shell satisfy 0 ⁇ W1 ⁇ T1, which can make the width of the flange surface of the battery cell shell larger, making it easier to use swing welding.
  • the cell shell cover is welded to the cell shell by swing welding. Compared with wire welding and other methods, the area of the welding part can be increased, thereby further increasing the welding strength between the cell shell and the cell shell cover, making the connection between the cell shell and the cell shell cover stable and the cell shell cover is strong.
  • the chemical device has better sealing performance, and the electrochemical device is not prone to gaps or separation between the battery cell shell and the battery cell cover due to force or environmental changes, so the electrochemical device has higher reliability.
  • the battery cell cover and the battery cell shell may be welded together by wire welding or the like.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

一种电芯壳体（100）、电化学装置及其制备方法、用电设备，该电芯壳体（100）包括底壁（110）、侧壁（120）和法兰部（130），并和底壁（110）共同围成具有开口（102）的容纳空间（101），法兰部（130）设置于侧壁（120）远离底壁（110）的一端，法兰部（130）的至少一部分凸出于侧壁（120）的内表面和/或外表面；其中，法兰部（130）的法兰面（131）大致垂直于侧壁（120），且用于与电芯壳盖（200）连接；法兰部（130）的过渡面（132）弯曲连接法兰面（131）和侧壁（120）的内表面和/或外表面，过渡面（132）在侧壁（120）的厚度方向上的宽度为W1，侧壁（120）的壁厚为T1，满足0＜W1≤T1，使得法兰面（131）的宽度较大，同时法兰部（130）凸出于侧壁（120）的部分的宽度较小，并且能够使得侧壁（120）的壁厚较小，从而增大容纳空间（101）的体积，增大电化学装置的能量密度。

Description

电芯壳体、电化学装置及其制备方法、用电设备
相关申请的交叉引用
本申请要求享有于2023年07月14日提交的名称为“电芯壳体、电化学装置及其制备方法、用电设备”中国专利申请CN202310870108.5的优先权，该申请的全部内容通过引用并入本文中。
技术领域
本申请涉及电池技术领域，具体而言，涉及一种电芯壳体、电化学装置及其制备方法、用电设备。
背景技术
随着电子信息技术的飞速发展，各种电子设备也朝着智能化和多功能化的方向发展，对电池的能量密度要求也越来越高。因此，如何提高电池的能量密度成为电池领域亟待解决的问题。
发明内容
本申请提供一种电芯壳体、电化学装置及其制备方法、用电设备，能够有效提高电化学装置的能量密度。
第一方面，本申请提供一种电芯壳体，包括底壁、侧壁和法兰部，侧壁围设于底壁的周围，并和底壁共同围成具有开口的容纳空间，法兰部设置于侧壁远离底壁的一端，法兰部的至少一部分凸出于侧壁的内表面和/或外表面；
其中，法兰部具有法兰面和过渡面，法兰面大致垂直侧壁，且用于与电芯壳盖连接；过渡面弯曲连接法兰面和侧壁的内表面和/或外表面，过渡面在侧壁的厚度方向上的宽度为W1，侧壁的壁厚为T1，满足0＜W1≤T1。
在上述技术方案中，电芯壳体包括底壁、侧壁和法兰部，侧壁围设于底壁的周围，并和底壁共同围成具有开口的容纳空间，使得电极组件能够经开口容置于容纳空间内；法兰部设置于侧壁远离底壁的一端，法兰部的至少一部分凸出于侧壁的内表面和/或外表面，使得法兰部能够用于与电芯壳盖连接，并增大与电池壳盖的连接面积；法兰部具有法兰面和过渡面，法兰面大致垂直侧壁，且用于与电芯壳盖连接；过渡面弯曲连接法兰面和侧壁的内表面和/或外表面，过渡面在侧壁的厚度方向上的宽度为W1，侧壁的壁厚为T1，满足0＜W1≤T1，使得法兰面的宽度较大，同时法兰部凸出于侧壁的部分的宽度较小，能够使得电芯壳体的占用空间较小，从而能够增大容纳空间的体积，增大电化学装置的能量密度，并且能够使得侧壁的壁厚较小，从而进一步增大容纳空间的体积，增大电化学装置的能量密度。若W1较大(例如大于T1)，则有可能造成法兰面的宽度较小或法兰部凸出于侧壁的部分的宽度较大，法兰面的宽度较小可能会影响电芯壳体与电芯壳盖的连接强度，法兰部凸出于侧壁的部分的宽度较大则可能压缩容纳空间，影响电化学装置的能量密度。
在第一方面的一些实施例中，0＜W1≤0.7*T1。
在上述技术方案中，通过使得0＜W1≤0.7*T1，能够进一步使得法兰面的宽度更大，同时法兰部凸出于侧壁的部分的宽度更小，从而进一步增大容纳空间的体积，增大电化学装置的能量密度，并且能够进一步使得侧壁的壁厚更小，从而增大容纳空间的体积，增大电化学装置的能量密度。
在第一方面的一些实施例中，法兰面在侧壁的厚度方向上的宽度为W2，满足W2≥0.7*T1。
在上述技术方案中，通过使得法兰面在侧壁的厚度方向上的宽度W2满足W2≥0.7*T1，能够使得法兰面与电芯壳盖的连接面积更大，电芯壳体与电芯壳盖的连接更加稳固，密封性更好，电化学装置不易因受力或环境变化导致电芯壳体与电芯壳盖之间产生间隙或者分离，电化学装置的可靠性更高。若W2较小(例如小于0.7*T1)，则可能影响电芯壳体和电芯壳盖的连接强度，进而影响电化学装置的密封性。
在第一方面的一些实施例中，法兰面为平面，过渡面为弧形面。
在上述技术方案中，通过将法兰面设置为平面，能够使得法兰面能够更好地与电芯壳盖贴合，以便于法兰面与电芯壳盖连接。将过渡面设置为弧形面，便于法兰部的制备。
在第一方面的一些实施例中，法兰部的至少一部分凸出于侧壁的外表面，法兰部凸出于侧壁的外表面的部分在侧壁的厚度方向上的宽度为W3，满足0.05mm≤W3≤0.3mm。
在上述技术方案中，法兰部的至少一部分凸出于侧壁的外表面，通过使得法兰部凸出于侧壁的外表面的部分在侧壁的厚度方向上的宽度W3满足0.05mm≤W3≤0.3mm，一方面能够使得法兰面的宽度较大，电芯壳体与电芯壳盖的连接面积较大，连接强度较好，另一方面能够减小法兰部凸出于侧壁的外表面的部分占据的空间，进而使得电化学装置的尺寸一定的情况下，容纳空间的体积更大，电极组件的体积更大，电化学装置的能量密度更大。若W3较小(例如小于0.05mm)，则法兰面的宽度较小，电芯壳体与电芯壳盖的连接面积较小，连接强度较低，电化学装置受力或环境变化时，电芯壳体与电芯壳盖之间可能产生间隙或者分离，影响电化学装置的密封性。若W3较大(例如大于0.3mm)，则法兰部凸出于侧壁的外表面的部分占据的空间较大，进而使得电化学装置的尺寸一定的情况下，容纳空间的体积较小，电极组件的体积较小，电化学装置的能量密度也较小。
在第一方面的一些实施例中，0.05mm≤W3≤0.15mm。
在上述技术方案中，通过使得0.05mm≤W3≤0.15mm，能够进一步减小法兰部凸出于侧壁的外表面的部分占据的空间，进而使得电化学装置的尺寸一定的情况下，容纳空间的体积更大，电极组件的体积更大，电化学装置的能量密度更大。
在第一方面的一些实施例中，法兰部的至少一部分凸出于侧壁的外表面，法兰部凸出于侧壁的外表面的部分的厚度为T2，满足0.7*T1≤T2≤1.1*T1。
在上述技术方案中，通过使得法兰部凸出于侧壁的外表面的部分的厚度T2满足0.7*T1≤T2≤1.1*T1，一方面能够使得法兰部的强度较大，不易变形，还能够为电芯壳体与电芯壳盖的焊接连接预留足够的焊接深度，使得电芯壳体与电芯壳盖的连接强度较大，另一方面能够使得过渡面的宽度较小，进而能够增大容纳空间的体积，增大电化学装置的能量密度。若T2较小(例如小于0.7*T1)，则法兰部的强度较小，可能容易因受力或环境变化而产生变形，同时限制了电芯壳体与电芯壳盖的焊接深度，可能影响电芯壳体与电芯壳盖的连接强度。若T2较大(例如大于1.1*T1)，则不便于形成宽度较小的过渡面，可能影响容纳空间的体积，进而影响电化学装置的能量密度。
在第一方面的一些实施例中，0.05mm≤T1≤0.15mm。
在上述技术方案中，通过使得侧壁的壁厚T1满足0.05mm≤T1≤0.15mm，一方面，能够使得电芯壳体的强度较大，不易因受力或环境变化而产生变形或破损，能够更好地起到对电极组件的保护作用及维持电化学装置正常工作，另一方面，能够减小电芯壳体占用的空间，在电化学装置的尺寸一定的情况下，预留更大的容纳空间，使得电极组件的体积更大，电化学装置的能量密度更高。若T1较小(例如小于0.05mm)，则电芯壳体的强度较小，可能因受力或环境变化而产生变形或破损，影响对电极组件的保护作用及电化学装置的正常工作。若T1较大(例如大于0.15mm)，则会使得电芯壳体占用的空间较大，在电化学装置的尺寸一定的情况下，预留的容纳空间更小，使得电极组件的体积更小，电化学装置的能量密度更小。
在第一方面的一些实施例中，0.05mm≤T1≤0.1mm。
在上述技术方案中，通过使得0.05mm≤T1≤0.1mm，能够进一步减小电芯壳体占用的空间，在电化学装置的尺寸一定的情况下，预留更大的容纳空间，使得电极组件的体积更大，电化学装置的能量密度更高。
在第一方面的一些实施例中，法兰部对应过渡面的部分的厚度为T3，满足T3＞T1。
在上述技术方案中，通过使得法兰部对应过渡面的部分的厚度T3满足T3＞T1，能够使得法兰部与侧壁的连接更加牢固，法兰部不易与侧壁分离，电芯壳体的整体结构更加稳固。
在第一方面的一些实施例中，T3满足：T1<T3<1.5*T1。
在上述的技术方案中，使得法兰部对应过渡面的部分的厚度T3满足T1<T3<1.5*T1，当过渡面的部分的厚度过大时，会导致电芯壳体的能量密度降低，T3满足上述条件以平衡电芯壳体中法兰部与侧壁连接牢固和电芯能量密度的关系。
在第一方面的一些实施例中，法兰部对应过渡面的部分的厚度为T3，满足0.06mm≤T3≤0.2mm。
在上述技术方案中，法兰部对应过渡面的部分的厚度T3满足0.06mm≤T3≤0.2mm，过渡面的部分厚度过小会影响法兰部的连接强度，厚度过大将对电芯能量密度造成影响，采用上述方案 能够保证连接强度的同时减少能量密度损失。
在第一方面的一些实施例中，法兰部对应过渡面的部分的厚度为T3，满足0.09mm≤T3≤0.12mm。
在上述技术方案中，法兰部对应过渡面的部分的厚度T3满足0.09mm≤T3≤0.12mm，采用上述方案更能够更大程度保证连接强度的同时减少能量密度损失。
第二方面，本申请提供一种电化学装置，包括如上述的电芯壳体、电芯壳盖、电极组件，电极组件容置于容纳空间内，电芯壳盖盖设于开口。
在第二方面的一些实施例中，电芯壳盖沿其第一方向的长度为D1，电芯壳盖沿第二方向的长度为D2，电芯壳体沿第一方向的长度为D3，电芯壳体沿第二方向的长度为D4，满足D1≤D3，D2≤D4；第一方向、第二方向和电芯壳盖的厚度方向两两垂直。
在上述技术方案中，通过使得电芯壳盖沿其第一方向的长度D1，电芯壳盖沿第二方向的长度D2，电芯壳体沿第一方向的长度D3，电芯壳体沿第二方向的长度D4，满足D1≤D3，D2≤D4，能够便于电芯壳体与电芯壳盖的连接，使得电芯壳体与电芯壳盖的连接较稳固，且能够减小电芯壳盖凸出于电芯壳体的可能性，有利于提高电化学装置的能量密度。
在第二方面的一些实施例中，电芯壳体沿第一方向的两侧超出电芯壳盖的长度分别为E1和E2，电芯壳体沿第二方向的两侧超出电芯壳盖的长度分别为E3和E4，E1、E2、E3、E4平均值为ˉE，满足ˉE≤0.05mm。
在上述技术方案中，电芯壳体沿第一方向的两侧超出电芯壳盖的长度分别为E1和E2，电芯壳体沿第二方向的两侧超出电芯壳盖的长度分别为E3和E4，通过使得E1、E2、E3、E4的平均值ˉE满足ˉE≤0.05mm，能够使得法兰面未超出电芯壳盖的部分的长度较大，即法兰面与电芯壳盖连接的部分的长度较大，从而能够进一步便于电芯壳体与电芯壳盖的连接，使得电芯壳体与电芯壳盖的连接更加稳固，电化学装置的密封性更好，电化学装置不易因受力或环境变化导致电芯壳体与电芯壳盖之间产生间隙或者分离，电化学装置的可靠性更高。若ˉE较大(例如大于0.05mm)，则法兰面未超出电芯壳盖的部分的长度较小，即法兰面与电芯壳盖连接的部分的长度较小，可能影响电芯壳体和电芯壳盖的连接强度。
在第二方面的一些实施例中，电芯壳体和电芯壳盖为焊接连接或粘接连接。
在上述技术方案中，电芯壳体和电芯壳盖通过焊接连接或粘接连接，能够使得电芯壳体和电芯壳盖的连接稳固，电化学装置的密封性较好，电化学装置不易因受力或环境变化导致电芯壳体与电芯壳盖之间产生间隙或者分离，电化学装置的可靠性较高。
在第二方面的一些实施例中，电芯壳体和电芯壳盖为焊接连接，电芯壳体与电芯壳盖之间形成焊接部，焊接部在底壁的厚度方向上的深度为H，焊接部在侧壁的厚度方向上的宽度为W4，满足H≥0.5*T1，W4≥T1。
在上述技术方案中，通过使得焊接部在底壁的厚度方向上的深度H，焊接部在侧壁的厚度方向上的宽度W4满足H≥0.5*T1，W4≥T1，能够使得电芯壳体与电芯壳盖的焊接强度较高，电芯壳体和电芯壳盖的连接稳固，电化学装置的密封性较好，电化学装置不易因受力或环境变化导致电芯壳体与电芯壳盖之间产生间隙或者分离，电化学装置的可靠性较高。若H、W4较小(例如H小于0.5*T1，W4小于T1)，则电芯壳体与电芯壳盖的焊接强度较低，电化学装置可能因受力或环境变化导致电芯壳体与电芯壳盖之间产生间隙或者分离，影响电化学装置的可靠性。
在第二方面的一些实施例中，电芯壳体和电芯壳盖为焊接连接，电芯壳体与电芯壳盖之间形成焊接部，焊接部的部分凸出于电芯壳盖的侧边，且凸出的部分的外表面为弧形面。
在上述技术方案中，使得焊接部的部分凸出于电芯壳盖的侧边，能够使得焊接部的体积较大，电芯壳体与电芯壳盖之间的连接强度更高，电芯壳体和电芯壳盖的连接稳固，电化学装置的密封性较好，电化学装置不易因受力或环境变化导致电芯壳体与电芯壳盖之间产生间隙或者分离，电化学装置的可靠性较高。使得焊接部凸出于电芯壳盖的部分的外表面为弧形面，能够减小焊接部与其他装置产生干涉时，焊接部和其他装置受损的可能性。
第三方面，本申请提供一种用电设备，包括如上述的电化学装置，电化学装置用于提供电能。
第四方面，本申请提供一种电化学装置的制备方法，包括：
对原料板进行冲压，以形成电芯壳体；
在冲压过程中，通过拍平和挤负角的方式将电芯壳体的法兰部的过渡面向电芯壳体的内侧 挤压成型，以使得过渡面在电芯壳体的侧壁的厚度方向上的宽度W1和电芯壳体的侧壁的壁厚T1满足0＜W1≤T1；
将电极组件安装于电芯壳体的容纳空间内；
将电芯壳盖盖设于电芯壳体的开口，并将电芯壳盖与电芯壳体固定连接。
在上述技术方案中，在冲压过程中通过拍平和挤负角的方式使得电芯壳体的过渡面在电芯壳体的侧壁的厚度方向上的宽度W1和电芯壳体的侧壁的壁厚T1满足0＜W1≤T1，使得电芯壳体的法兰面的宽度较大，同时电芯壳体的法兰部凸出于侧壁的部分的宽度较小，从而能够增大容纳空间的体积，增大电化学装置的能量密度，并且能够使得侧壁的壁厚较小，从而进一步增大容纳空间的体积，增大电化学装置的能量密度。
在第四方面的一些实施例中，将电芯壳盖与电芯壳体固定连接的方法包括：
通过摆动焊的方式将电芯壳盖与电芯壳体焊接连接。
在上述技术方案中，通过摆动焊的方式将电芯壳盖与电芯壳体焊接连接，能够进一步增加电芯壳体与电芯壳盖的焊接强度，使得电芯壳体和电芯壳盖的连接稳固，电化学装置的密封性较好，电化学装置不易因受力或环境变化导致电芯壳体与电芯壳盖之间产生间隙或者分离，电化学装置的可靠性较高。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对本申请实施例中所需要使用的附图作简单地介绍，应当理解，以下附图仅示出了本申请的某些实施例，因此不应被看作是对范围的限定，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他相关的附图。
图1为本申请一些实施例提供的电芯壳体的立体结构示意图；
图2为本申请一些实施例提供的电芯壳体的一个视角的结构示意图；
图3为图2所示的电芯壳体沿A-A方向的剖视示意图；
图4为图3所示的电芯壳体的B处的局部放大的结构示意图；
图5为本申请一些实施例提供的电化学装置的立体结构示意图；
图6为本申请一些实施例提供的电化学装置的爆炸结构示意图；
图7为本申请一些实施例提供的电化学装置的一个视角的结构示意图；
图8为图7所示的电化学装置沿C-C方向的剖视示意图；
图9为图8所示的电化学装置的D处的局部放大的结构示意图；
图10为图8所示的电化学装置另一状态的D处的局部放大的结构示意图；
图11为本申请一些实施例提供的电化学装置的制备方法的流程示意图。
图标：10-电化学装置；100-电芯壳体；101-容纳空间；102-开口；110-底壁；120-侧壁；121-注液孔；130-法兰部；140-极柱；200-电芯壳盖；210-焊接部；211-底面；300-电极组件；310-第一电连接件；320-第二电连接件；X-第一方向；Y-第二方向；Z-第三方向。
具体实施例方式
为使本申请的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员所获得的所有其他实施例，都属于本申请保护的范围。
除非另有定义，本申请所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同；在本申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请；本申请的说明书和权利要求书及上述附图说明中的术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。
本申请的说明书和权利要求书或上述附图中的术语“第一”、“第二”等是用于区别不同对象，而不是用于描述特定顺序或主次关系。
在本申请中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。
在本申请的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“附接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请中的具体含义。
在本申请的实施例中，相同的附图标记表示相同的部件，并且为了简洁，在不同实施例中，省略对相同部件的详细说明。应理解，附图示出的本申请实施例中的各种部件的厚度、长宽等尺寸，以及集成装置的整体厚度、长宽等尺寸仅为示例性说明，而不应对本申请构成任何限定。
随着新能源行业的发展，电池逐步朝着高能量密度、高功率密度的方向发展。然而用电设备用于容置电化学装置的电池仓的体积有限，使得通过增大电化学装置的体积而提高电化学装置的能量密度的方式受限。因此，通过改变电化学装置本身的结构以提高电化学装置的能量密度的可行性更高。
电芯壳体一般包括底壁和侧壁，侧壁围设于底壁的周围，并和底壁共同围成具有开口的容纳空间，使得电极组件能够经开口容置于容纳空间内。电极组件安装后，需在电芯壳体上设置电芯壳盖，以覆盖开口，使得容纳空间与外界隔离。目前，电芯壳体和电芯壳盖的连接方式主要有两种，一种是旋切壳体加顶部焊接的方式，具体为电芯壳体不设置法兰部，电芯壳盖与电芯壳体的侧壁顶面抵接，并将电芯壳盖与侧壁的顶面焊接。为了使得侧壁的顶面具有足够的焊接面积，侧壁需具有较大的厚度，会造成电芯壳体的占据空间较大，压缩容纳空间的体积，使得电极组件的体积减小，影响电化学装置的能量密度。另一种是大法兰加顶部焊接的方式，具体为在电芯壳体的侧壁远离底壁的一端设置宽度较大的法兰部，法兰部向远离容纳空间的方向凸出，能够形成法兰面，用于与电芯壳盖连接，能够减小侧壁的厚度，但是法兰部会增大电芯壳体的整体尺寸，在电芯壳体的整体尺寸不变的情况下，设置法兰部就会压缩容纳空间，使得电极组件的体积减小，影响电化学装置的能量密度。
为了提高电化学装置的能量密度，本申请提供了一种电芯壳体，电芯壳体包括底壁、侧壁和法兰部，侧壁围设于底壁的周围，并和底壁共同围成具有开口的容纳空间，法兰部设置于侧壁远离底壁的一端，法兰部的至少一部分凸出于侧壁的内表面和/或外表面；其中，法兰部具有法兰面和过渡面，法兰面大致垂直侧壁，且用于与电芯壳盖连接；过渡面弯曲连接法兰面和侧壁的内表面和/或外表面，过渡面在侧壁的厚度方向上的宽度为W1，侧壁的壁厚为T1，满足0＜W1≤T1。
在这种结构的电芯壳体中，电芯壳体包括底壁、侧壁和法兰部，侧壁围设于底壁的周围，并和底壁共同围成具有开口的容纳空间，使得电极组件能够经开口容置于容纳空间内；法兰部设置于侧壁远离底壁的一端，法兰部的至少一部分凸出于侧壁的外表面，使得法兰部能够用于与电芯壳盖连接，并增大与电池壳盖的连接面积；法兰部具有法兰面和过渡面，法兰面大致垂直侧壁，且用于与电芯壳盖连接；过渡面弯曲连接法兰面和侧壁的内表面，过渡面在侧壁的厚度方向上的宽度为W1，侧壁的壁厚为T1，满足0＜W1≤T1，使得法兰面的宽度较大，同时法兰部凸出于侧壁的部分的宽度较小，能够使得电芯壳体的占用空间较小，从而能够增大容纳空间的体积，增大电化学装置的能量密度，并且能够使得侧壁的壁厚较小，从而进一步增大容纳空间的体积，增大电化学装置的能量密度。若W1较大(例如大于T1)，则有可能造成法兰面的宽度较小或法兰部凸出于侧壁的部分的宽度较大，法兰面的宽度较小可能会影响电芯壳体与电芯壳盖的连接强度，法兰部凸出于侧壁的部分的宽度较大则可能压缩容纳空间，影响电化学装置的能量密度。
本申请实施例提供一种包括电芯壳体的电化学装置，电化学装置可以是二次电池或一次电池，例如可以是锂离子电池、钠离子电池或镁离子电池等，本申请实施例对此并不限定。电化学装置可呈圆柱体、扁平体、长方体或其它形状等，本申请实施例对此也不限定。
本申请实施例提供一种使用电化学装置作为电源的用电设备，用电设备可以为但不限于手机、平板、笔记本电脑、电动玩具、电动工具、电瓶车、电动汽车、轮船、航天器等等。
参见图1至图4，图1为本申请一些实施例提供的电芯壳体的立体结构示意图，图2为本申请一些实施例提供的电芯壳体的一个视角的结构示意图，图3为图2所示的电芯壳体沿A-A方向的剖视示意图，图4为图3所示的电芯壳体的B处的局部放大的结构示意图。本申请实施例提供了一种电芯壳体100，电芯壳体100包括底壁110、侧壁120和法兰部130，侧壁120围设于底壁110的周围，并和底壁110共同围成具有开口102的容纳空间101，法兰部130设置于侧壁120远离底壁110的一端，法兰部130的至少一部分凸出于侧壁120的外表面。其中，法兰部130具有法兰面131和过渡面132，法兰面131大致垂直侧壁120，且用于与电芯壳盖200连接；过渡面132弯曲连 接法兰面131和侧壁120的内表面，过渡面132在侧壁120的厚度方向上的宽度为W1，侧壁120的壁厚为T1，满足0＜W1≤T1。
法兰面131大致垂直侧壁120，即法兰面131所在的平面与侧壁120的外表面或内表面所在的平面之间的夹角与90°的差值在预设差值的范围内。
在一些实施例中，电芯壳体100可以为强度较高的材料制成，例如钢铁、铝合金等金属材料，使得电芯壳体100具有较高的受力性能，进而能够使得电芯壳体100不易因受力或环境变化导致变形或破损，进而能够使得电化学装置10的可靠性更高。
在另一些实施例中，电芯壳体100也可以为碳纤维、硬质塑料等强度较高的非金属材料。
法兰是两个部件之间相互连接的零件，用于部件端部之间的连接。法兰连接是指设置有法兰的部件与另一个部件相互连接作为一组组合密封结构的可拆连接。凡是在两个平面周边通过固定连接方式连接同时封闭的连接零件，一般都称为“法兰”。
在一些实施例中，法兰部130围设于侧壁120的周围，且向远离容纳空间101的方向延伸，以使得法兰部130的至少一部分凸出于侧壁120的外表面。
在一些实施例中，底壁110、侧壁120和法兰部130为一体成形设置，能够使得电芯壳体100的整体结构稳固，不易因受力或环境变化而在底壁110与侧壁120之间、侧壁120与法兰部130之间形成间隙或相互分离，电芯壳体100的密封性较好。
在另一些实施例中，底壁110、侧壁120和法兰部130也可以分别制备成形后，再通过焊接或粘接等方式固定连接。
在一些实施例中，侧壁120的厚度方向垂直于第三方向Z，侧壁120的厚度方向包括第一方向X和第二方向Y。
例如图2和图4所示，位于法兰部130沿第一方向X相对的两个部分的过渡面132的宽度为过渡面132沿第一方向X的尺寸，位于法兰部130沿第二方向Y相对的两个部分的过渡面132的宽度为过渡面132沿第二方向Y的尺寸。
例如图2和图4所示，位于侧壁120沿第一方向X相对的两个部分的壁厚为侧壁120沿第一方向X的尺寸，位于侧壁120沿第二方向Y相对的两个部分的壁厚为侧壁120沿第二方向Y的尺寸。
电芯壳体100包括底壁110、侧壁120和法兰部130，侧壁120围设于底壁110的周围，并和底壁110共同围成具有开口102的容纳空间101，使得电极组件300能够经开口102容置于容纳空间101内。法兰部130设置于侧壁120远离底壁110的一端，法兰部130的至少一部分凸出于侧壁120的外表面，使得法兰部130能够用于与电芯壳盖200连接，并增大与电池壳盖200的连接面积，同时开口102的面积较大，便于电极组件300的安装。法兰部130具有法兰面131和过渡面132，法兰面131大致垂直侧壁120，且用于与电芯壳盖200连接；过渡面132弯曲连接法兰面131和侧壁120的内表面，过渡面132在侧壁120的厚度方向上的宽度为W1，侧壁120的壁厚为T1，满足0＜W1≤T1，例如W1可以为0.5*T1、0.8*T1或T1，使得法兰面131的宽度较大，同时法兰部130凸出于侧壁120的部分的宽度较小，从而能够增大容纳空间101的体积，增大电化学装置10的能量密度，并且能够使得侧壁120的壁厚较小，从而进一步增大容纳空间101的体积，增大电化学装置10的能量密度。若W1较大(例如大于T1)，则有可能造成法兰面131的宽度较小或法兰部130凸出于侧壁120的部分的宽度较大，法兰面131的宽度较小可能会影响电芯壳体100与电芯壳盖200的连接强度，法兰部130凸出于侧壁120的部分的宽度较大则可能压缩容纳空间101，影响电化学装置10的能量密度。
在另一些实施例中，法兰部130的部分也可以凸出于侧壁120的内表面，过渡面132弯曲连接法兰面131和侧壁120的外表面，能够减小电芯壳体100的占用空间，有利于提高电化学装置10的能量密度。并通过使得过渡面132在侧壁120的厚度方向上的宽度W1和侧壁120的壁厚T1满足0＜W1≤T1，使得法兰面131的宽度较大，同时法兰部130凸出于侧壁120的部分的宽度较小，便于电极组件300的安装。若W1较大(例如大于T1)，则有可能造成法兰面131的宽度较小或法兰部130凸出于侧壁120的部分的宽度较大，法兰面131的宽度较小可能会影响电芯壳体100与电芯壳盖200的连接强度，法兰部130凸出于侧壁120的部分的宽度较大则可能影响电极组件300的安装，从而造成电极组件300的体积较小，影响电化学装置10的能量密度。
在另一些实施例中，法兰部130的一部分可以凸出于侧壁120的内表面设置，同时一部分可以凸出于侧壁120的外表面设置，法兰部130形成两个过渡面132，一个过渡面132弯曲连接法 兰面131和侧壁120的外表面，另一个过渡面132弯曲连接法兰面131和侧壁120的内表面，能够进一步增大法兰面131的宽度，提高电芯壳体100与电芯壳体200的连接强度。并通过使得过渡面132在侧壁120的厚度方向上的宽度W1和侧壁120的壁厚T1满足0＜W1≤T1，使得法兰部130对容纳空间101的占用较小，有利于提高电化学装置10的能量密度。
在一些实施例中，0＜W1≤0.7*T1，例如W1可以为0.7*T1、0.6*T1或0.4*T1等。
通过使得0＜W1≤0.7*T1，能够进一步使得法兰面131的宽度更大，同时法兰部130凸出于侧壁120的部分的宽度更小，从而进一步增大容纳空间101的体积，增大电化学装置10的能量密度，并且能够进一步使得侧壁120的壁厚更小，从而增大容纳空间101的体积，增大电化学装置10的能量密度。
在一些实施例中，法兰面131在侧壁120的厚度方向上的宽度为W2，满足W2≥0.7*T1，例如W2可以为0.7*T1、0.8*T1或T1等。
例如图2和图4所示，位于法兰部130沿第一方向X相对的两个部分的法兰面131的宽度为法兰面131沿第一方向X的尺寸，位于法兰部130沿第二方向Y相对的两个部分的法兰面131的宽度为法兰面131沿第二方向Y的尺寸。
通过使得法兰面131在侧壁120的厚度方向上的宽度W2满足W2≥0.7*T1，能够使得法兰面131与电芯壳盖200的连接面积更大，电芯壳体100与电芯壳盖200的连接更加稳固，密封性更好，电化学装置10不易因受力或环境变化导致电芯壳体100与电芯壳盖200之间产生间隙或者分离，电化学装置10的可靠性更高。若W2较小(例如小于0.7*T1)，则可能影响电芯壳体100和电芯壳盖200的连接强度，进而影响电化学装置10的密封性。
在一些实施例中，法兰面131为平面，过渡面132为弧形面。
在一些实施例中，法兰面131垂直于侧壁120，即法兰面131垂直于侧壁120的内表面或外表面，侧壁120的内表面或外表面与第三方向Z平行。
通过将法兰面131设置为平面，法兰面131垂直于侧壁120的内表面或外表面，即法兰面131平行于X-Y方向，使得法兰面131能够更好地与电芯壳盖200贴合，以便于法兰面131与电芯壳盖200连接。将过渡面132设置为弧形面，便于法兰部130的制备。其中，法兰部130可由电芯壳体100的侧壁折弯形成。
在一些实施例中，法兰部130凸出于侧壁120的外表面的部分在侧壁120的厚度方向上的宽度为W3，满足0.05mm≤W3≤0.3mm，例如W3可以为0.05mm、0.1mm或0.3mm等。
例如图2和图4所示，位于法兰部130沿第一方向X相对的两个部分的法兰部130凸出于侧壁120的部分的宽度为法兰部130凸出于侧壁120的部分沿第一方向X的尺寸，位于法兰部130沿第二方向Y相对的两个部分的法兰部130凸出于侧壁120的部分的宽度为法兰部130凸出于侧壁120的部分沿第二方向Y的尺寸。
通过使得法兰部130凸出于侧壁120的外表面的部分在侧壁120的厚度方向上的宽度W3满足0.05mm≤W3≤0.3mm，一方面能够使得法兰面131的宽度较大，电芯壳体100与电芯壳盖200的连接面积较大，连接强度较好，另一方面能够减小法兰部130凸出于侧壁120的外表面的部分占据的空间，进而使得电化学装置10的尺寸一定的情况下，容纳空间101的体积更大，电极组件300的体积更大，电化学装置10的能量密度更大。若W3较小(例如小于0.05mm)，则法兰面131的宽度较小，电芯壳体100与电芯壳盖200的连接面积较小，连接强度较低，电化学装置10受力或环境变化时，电芯壳体100与电芯壳盖200之间可能产生间隙或者分离，影响电化学装置10的密封性。若W3较大(例如大于0.3mm)，则法兰部130凸出于侧壁120的外表面的部分占据的空间较大，进而使得电化学装置10的尺寸一定的情况下，容纳空间101的体积较小，电极组件300的体积较小，电化学装置10的能量密度也较小。
在一些实施例中，0.05mm≤W3≤0.15mm，例如W3可以为0.05mm、0.1mm或0.15mm等。
通过使得0.05mm≤W3≤0.15mm，能够进一步减小法兰部130凸出于侧壁120的外表面的部分占据的空间，进而使得电化学装置10的尺寸一定的情况下，容纳空间101的体积更大，电极组件300的体积更大，电化学装置10的能量密度更大。
在一些实施例中，法兰部130凸出于侧壁120的外表面的部分的厚度为T2，满足0.7*T1≤T2≤1.1*T1，例如T2可以为0.7*T1、0.9*T1或1.1*T1等。
在一些实施例中，法兰部130凸出于侧壁120的外表面的部分的厚度为法兰部130在底壁 110的厚度方向(第三方向Z)上的尺寸。
在一些实施例中，底壁110的厚度方向与侧壁120的厚度方向垂直。
在一些实施例中，电芯壳体100制备成形后，还可以通过切削的方式减小过渡面132的宽度W1。例如沿电芯壳体100的底壁110的厚度方向的垂直方向(X-Y平面的平行方向)对电芯壳体100的顶面进行切削，能够进一步减小过渡面132的宽度W1，增大法兰面131的宽度W2，同时法兰部130凸出于侧壁120的外表面的部分的厚度T2也会减小。
在一些实施例中，电芯壳体100的制备过程中，可以将原料板向电芯壳体100的侧壁120远离底壁110的一端挤压，从而使得法兰部130凸出于侧壁120的外表面的部分的厚度T2能够大于侧壁120的壁厚T1。
通过使得法兰部130凸出于侧壁120的外表面的部分的厚度T2满足0.7*T1≤T2≤1.1*T1，一方面能够使得法兰部130的强度较大，不易变形，还能够为电芯壳体100与电芯壳盖200的焊接连接预留足够的焊接深度，使得电芯壳体100与电芯壳盖200的连接强度较大，另一方面能够使得过渡面132的宽度较小，进而能够增大容纳空间101的体积，增大电化学装置10的能量密度。若T2较小(例如小于0.7*T1)，则法兰部130的强度较小，可能容易因受力或环境变化而产生变形，同时限制了电芯壳体100与电芯壳盖200的焊接深度，可能影响电芯壳体100与电芯壳盖200的连接强度。若T2较大(例如大于1.1*T1)，则不便于形成宽度较小的过渡面132，可能影响容纳空间101的体积，进而影响电化学装置10的能量密度。
在一些实施例中，0.05mm≤T1≤0.15mm，例如T1可以为0.05mm、0.09mm或0.15mm等。
通过使得侧壁120的壁厚T1满足0.05mm≤T1≤0.15mm，一方面，能够使得电芯壳体100的强度较大，不易因受力或环境变化而产生变形或破损，能够更好地起到对电极组件300的保护作用及维持电化学装置10正常工作，另一方面，能够减小电芯壳体100占用的空间，在电化学装置10的尺寸一定的情况下，预留更大的容纳空间101，使得电极组件300的体积更大，电化学装置10的能量密度更高。若T1较小(例如小于0.05mm)，则电芯壳体100的强度较小，可能因受力或环境变化而产生变形或破损，影响对电极组件300的保护作用及电化学装置10的正常工作。若T1较大(例如大于0.15mm)，则会使得电芯壳体100占用的空间较大，在电化学装置10的尺寸一定的情况下，预留的容纳空间101更小，使得电极组件300的体积更小，电化学装置10的能量密度更小。
在一些实施例中，0.05mm≤T1≤0.1mm，例如T1可以为0.05mm、0.07mm或0.1mm等。
通过使得0.05mm≤T1≤0.1mm，能够进一步减小电芯壳体100占用的空间，在电化学装置10的尺寸一定的情况下，预留更大的容纳空间101，使得电极组件300的体积更大，电化学装置10的能量密度更高。
在一些实施例中，法兰部130对应过渡面132的部分的厚度为T3，满足T3＞T1。
法兰部130对应过渡面132的部分的厚度为法兰部130在过渡面132的垂直方向上的尺寸。图4中示例性地标出了法兰部130对应过渡面132上的一处的厚度。
通过使得法兰部130对应过渡面132的部分的厚度T3满足T3＞T1，能够使得法兰部130与侧壁120的连接更加牢固，法兰部130不易与侧壁120分离，电芯壳体100的整体结构更加稳固。
在另外的一些实施例中，T3满足：T1<T3<1.5*T1。
通过使得法兰部130对应过渡面132的部分的厚度T3满足T1<T3<1.5*T1，当过渡面132的部分的厚度过大时，会导致电芯壳体100的能量密度降低，T3满足上述条件以平衡电芯壳体100中法兰部130与侧壁120连接牢固和电芯能量密度的关系。
在一些实施例中，法兰部对应过渡面的部分的厚度为T3，满足0.06mm≤T3≤0.2mm。
通过设计法兰部对应过渡面的部分的厚度T3满足0.06mm≤T3≤0.2mm，过渡面的部分厚度过小会影响法兰部的连接强度，厚度过大将对电芯能量密度造成影响，采用上述方案能够保证连接强度的同时减少能量密度损失。
在另外的一些实施例中，法兰部对应过渡面的部分的厚度为T3，满足0.09mm≤T3≤0.12mm。
通过设计法兰部对应过渡面的部分的厚度T3满足0.09mm≤T3≤0.12mm，能够更大程度保证连接强度的同时减少能量密度损失，其中T3的大小可以处于0.09mm、0.1mm、0.11mm、 0.12mm中任意两个数值的范围。
参见图5和图6，图5为本申请一些实施例提供的电化学装置的立体结构示意图，图6为本申请一些实施例提供的电化学装置的爆炸结构示意图。本申请实施例提供了一种电化学装置10，包括以上任一方案的电芯壳体100、电芯壳盖200、电极组件300，电极组件100容置于容纳空间101内，电芯壳盖200盖设于开口102。
在一些实施例中，电芯壳盖200可以为强度较高的材料制成，例如钢铁、铝合金等金属材料，使得电芯壳体200具有较高的受力性能，进而能够使得电芯壳盖200不易因受力或环境变化导致变形或破损，进而能够使得电化学装置10的可靠性更高。
在另一些实施例中，电芯壳盖200也可以为碳纤维、硬质塑料等强度较高的非金属材料。
电化学装置包括电池壳体100、电池壳盖200、电极组件300和电解液，壳体100和电池壳盖200用于容纳电极组件300和电解液。电极组件300由正极极片、负极极片和隔离膜组成。电化学装置主要依靠金属离子在正极极片和负极极片之间移动来工作。正极极片包括正极集流体和正极活性物质层，正极活性物质层涂覆于正极集流体的表面，未涂覆正极活性物质层的正极集流体的部分作为正极极耳，以通过正极极耳实现正极极片的电能输入或输出。以锂离子电池为例，正极集流体的材料可以为铝，正极活性物质可以为钴酸锂、磷酸铁锂、三元材料或锰酸锂等。负极极片包括负极集流体和负极活性物质层，负极活性物质层涂覆于负极集流体的表面，未涂覆负极活性物质层的负极集流体的部分作为负极极耳，以通过负极极耳实现负极极片的电能输入或输出。负极集流体的材料可以为铜，负极活性物质可以为碳材料或硅材料等。隔离膜的材质可以为聚丙烯(PP)或聚乙烯(PE)等。电解液可以包括有机溶剂、电解质锂盐等。
在一些实施例中，电极组件300可以是由负极极片、隔离膜和正极极片通过层叠布置形成的叠片式结构。
在另一些实施例中，电极组件也300可以是由负极极片、隔离膜和正极极片通过卷绕形成的卷绕式结构。
在一些实施例中，电化学装置10呈长方体设置，且顶角呈圆角设置，能够更好地适配用电设备内的圆角电池仓。
在另一些实施例中，电化学装置10的顶角也可以呈方角设置。
在一些实施例中，电芯壳盖200的厚度方向平行于第三方向Z，第一方向X、第二方向Y和第三方向Z两两垂直。
参见图1和图6，在一些实施例中，电池壳体100上设置有注液孔121，用于在电池壳体100与电芯壳盖200装配后，通过注液孔121向容纳空间101注入电解液，以使得电解液能够浸润电极组件300。
在一些实施例中，注液孔121可以设置在电池壳体100的侧壁120上，便于通过注液孔121向容纳空间101注入电解液。
在一些实施例中，电化学装置10还包括注液塞(图中未示出)，注液塞用于在注入电解液后封堵注液孔121，以实现电化学装置10的密封，减小外界水汽进入容纳空间101或电解液从容纳空间101泄漏的可能性。
在一些实施例中，注液孔121可以为圆孔，便于通过注液孔121注入电解液，也便于注液塞封堵注液孔121，减小电解液泄漏的可能性。
在另一些实施例中，注液孔121也可以为方形孔、异形孔等。
在一些实施例中，电化学装置10还包括第一电连接件310和第二电连接件320，电池壳体100上设置有贯穿电池壳体100的极柱140，第一电连接件310的一端与正极极片上的正极极耳电连接，另一端与极柱140电连接，使得外部装置能够通过极柱140、第一电连接件310与正极极片电连接。第二电连接件320的一端与负极极片上的负极极耳电连接，另一端与电芯壳体100电连接，使得外部装置能够通过壳体100、第二电连接件320与负极极片电连接。
在另一些实施例中，电化学装置10还包括第一电连接件310和第二电连接件320，电池壳体100上设置有贯穿电池壳体100的两个极柱140，第一电连接件310的一端与正极极片电连接，另一端与其中一个极柱140电连接，使得外部装置能够通过极柱140、第一电连接件310与正极极片电连接。第二电连接件320的一端与负极极片电连接，另一端与另一个极柱140电连接，使得外部装置能够通过极柱140、第二电连接件320与负极极片电连接。
在一些实施例中，第一电连接件310与正极极耳可以为焊接连接，第二电连接件320与负 极极耳可以为焊接连接。
在另一些实施例中，第一电连接件310与正极极耳可以为一体成形设置，第二电连接件320与负极极耳可以为一体成形设置。
在一些实施例中，第一电连接件310和第二电连接件320可以采用导电性能较好的材料制成，例如铅或铜等金属材料。
在一些实施例中，极柱140呈椭圆形设置，在电芯壳体100的厚度受限的情况下能够增大极柱140的横截面(极柱140在X-Z面上的截面)面积，从而增大极柱140与第二电连接件310和外部装置的连接面积，提高极柱140与第二电连接件310和外部装置的连接可靠性。
在另一些实施例中，极柱140也可以呈圆形、方形设置。
在一些实施例中，极柱140可以采用导电性能较好的材料制成，例如铅或铜等金属材料。
在一些实施例中，极柱140可以设置在电池壳体100的侧壁120上，便于极柱140与外部装置电连接。
在一些实施例中，注液孔121沿第二方向Y的投影与第一电连接件310、第二电连接件320沿第二方向Y的投影不重叠，能够减小注液孔121对第一电连接件310与极柱140的电连接、第二电连接件320与电芯壳体100的电连接的影响。
在一些实施例中，注液孔121和极柱140可以设置在侧壁120的同一侧，便于电芯壳体100的制备。
在另一些实施例中，注液孔121和极柱140可以设置在侧壁120的不同侧。
参见图2和图7，图7为本申请一些实施例提供的电化学装置的一个视角的结构示意图。在一些实施例中，电芯壳盖200沿其第一方向X的长度为D1，电芯壳盖200沿第二方向Y的长度为D2，电芯壳体100沿第一方向X的长度为D3，电芯壳体100沿第二方向Y的长度为D4，满足D1≤D3，D2≤D4。
在一些实施例中，电芯壳盖200可以为板状结构，使得电芯壳盖200能够盖合与电芯壳体100的开口侧，电芯壳体100与电芯壳盖200共同限定出容纳空间101。
通过使得电芯壳盖200沿其第一方向X的长度D1，电芯壳盖200沿第二方向Y的长度D2，电芯壳体100沿第一方向X的长度D3，电芯壳体100沿第二方向Y的长度D4，满足D1≤D3，D2≤D4，能够便于电芯壳体100与电芯壳盖200的连接，使得电芯壳体100与电芯壳盖200的连接较稳固，且能够减小电芯壳盖200凸出于电芯壳体100的可能性，有利于提高电化学装置10的能量密度。
由于制备电芯壳体100和电芯壳盖200的精度和成本受限，在生产中可能无法使得电芯壳体100的尺寸与电芯壳盖200的尺寸完全匹配，即D1＝D3，D2＝D4，通过使得电芯壳盖200的尺寸略小于电芯壳体100的尺寸，能够使得电芯壳盖200与电芯壳体100连接稳固的同时，减少电芯壳盖200与电芯壳体100装配后，电芯壳盖200凸出于电芯壳体100的可能性，从而减小因电芯壳盖200的装配而增大电化学装置10的整体尺寸的可能性，有利于提高电化学装置10的能量密度。
一并参见图8和图9，图8为图7所示的电化学装置沿C-C方向的剖视示意图，图9为图8所示的电化学装置的D处的局部放大的结构示意图。在一些实施例中，电芯壳体100沿第一方向X的两侧超出电芯壳盖200的长度分别为E1和E2，电芯壳体100沿第二方向Y的两侧超出电芯壳盖200的长度分别为E3和E4，E1、E2、E3、E4平均值为ˉE，满足ˉE≤0.05mm，例如ˉE可以为0.05mm、0.04mm或0.03mm等。
在图9中，示意性标出电芯壳体100沿第一方向X的一侧超出电芯壳盖200的尺寸E1，其他尺寸如E2、E3、E4与E1类似，未在图中标出。
电芯壳体100沿第一方向X的两侧超出电芯壳盖200的长度分别为E1和E2，电芯壳体100沿第二方向Y的两侧超出电芯壳盖200的长度分别为E3和E4，通过使得E1、E2、E3、E4的平均值ˉE满足ˉE≤0.05mm，能够使得法兰面131未超出电芯壳盖200的部分的长度较大，即法兰面131与电芯壳盖200连接的部分的长度较大，从而能够进一步便于电芯壳体100与电芯壳盖200的连接，使得电芯壳体100与电芯壳盖200的连接更加稳固，电化学装置10的密封性更好，电化学装置10不易因受力或环境变化导致电芯壳体100与电芯壳盖200之间产生间隙或者分离，电化学装置10的可靠性更高。若ˉE较大(例如大于0.05mm)，则法兰面131未超出电芯壳盖200的部分的长度较小，即法兰面131与电芯壳盖200连接的部分的长度较小，可能影响电芯壳体100和电芯壳盖200的连接强度。
在一些实施例中，电芯壳体100沿第一方向X的两侧，沿第二方向Y的两侧可以都超出电芯壳盖200。
在另一些实施例中，电芯壳体100的侧边也可以与电芯壳盖200对齐，或者电芯壳盖200的侧边也可以超出电芯壳体100。例如，当电芯壳盖200沿第一方向X的一侧超出电芯壳体100时，E1为负数。但是，通过使得ˉE≤0.05mm，能够使得电芯壳盖200四个侧边不过于超出电芯壳体100，从而减小电芯壳体100和电芯壳盖200的整体占用空间，有利于提高电化学装置10的能量密度。
例如，E1≤0.05mm，E2≤0.05mm，E3≤0.05mm，E4≤0.05mm，能够使得法兰面131与电芯壳体100连接的部分的长度较大，电芯壳盖200与电芯壳体100连接稳固的同时，减少电芯壳盖200与电芯壳体100装配后，电芯壳盖200凸出于电芯壳体100的可能性，从而减小因电芯壳盖200的装配而增大电化学装置10的整体尺寸的可能性，有利于提高电化学装置10的能量密度。
在另一些实施例中，电芯壳盖200也可以为一侧开口的空心结构，电芯壳盖200的开口侧盖合于电芯壳体100的开口侧，共同形成容纳空间101。电芯壳盖200也可以设置法兰部(图中未示出)，电芯壳盖200的法兰部与电芯壳体100的法兰部130的结构类似，在此不再赘述，电芯壳盖200的法兰部可以与电芯壳体100的法兰部130配合实现连接。
在一些实施例中，电芯壳体100和电芯壳盖200可以为焊接连接。
通过使得电芯壳体100和电芯壳盖200焊接连接，能够使得电芯壳体100和电芯壳盖200的连接稳固，电化学装置10的密封性较好，电化学装置10不易因受力或环境变化导致电芯壳体100与电芯壳盖200之间产生间隙或者分离，电化学装置10的可靠性较高。
在另一些实施例中，电芯壳体100和电芯壳盖200还可以为粘接连接。
参见图10，图10为图8所示的电化学装置另一状态的D处的局部放大的结构示意图。在一些实施例中，电芯壳体100和电芯壳盖200为焊接连接，电芯壳体100与电芯壳盖200之间形成焊接部210，焊接部210在底110壁的厚度方向上的深度为H，焊接部210在侧壁120的厚度方向上的宽度为W4，满足H≥0.5*T1，W4≥T1，例如H可以为0.5*T1、0.8*T1或T1等，W4可以为T1、1.2*T1或1.4*T1等。
在一些实施例中，电芯壳体100和电芯壳盖200的焊接方式可以为激光焊接，即使得激光透过电芯壳盖200到达电芯壳体100，将电芯壳体100和电芯壳盖200的连接处熔融，形成焊接部210。
在一些实施例中，焊接部210的深度为焊接部210在第三方向Z上的尺寸，焊接部210的宽度为焊接部210在第三方向Z的垂直方向(包括第一方向X和第二方向Y)上的尺寸。例如图2和图4所示，位于焊接部210沿第一方向X相对的两个部分的宽度为焊接部210沿第一方向X的尺寸，位于焊接部210沿第二方向Y相对的两个部分的宽度为焊接部210在第二方向Y上的尺寸。
在旋切壳体加顶部焊接的方式中，电芯壳体100与电芯壳盖200之间形成的焊接部是沿第三方向Z的反方向形成，且焊接部沿第三方向Z的反方向的宽度逐渐减小，其焊接宽度为焊接部在电芯壳体100的顶面(侧壁120或法兰部远离底壁110的一端的端面)所在的平面上的截面的宽度，能够达到电芯壳体100的侧壁的壁厚T1的1/4，因此焊接宽度较小，导致电芯壳体100与电芯壳盖200的焊接强度较小，电化学装置10可能因受力或环境变化导致电芯壳体100与电芯壳盖200之间产生间隙或者分离，影响电化学装置10的可靠性。
在大法兰加顶部焊接的方式中，电芯壳体100与电芯壳盖200之间形成的焊接部是沿第三方向Z的反方向形成，且焊接部沿第三方向Z的反方向的宽度逐渐减小，其焊接宽度为焊接部在电芯壳体100的顶面(侧壁120或法兰部远离底壁110的一端的端面)所在的平面上的截面的宽度，能够达到电芯壳体100的侧壁的壁厚T1的1/2，焊接宽度较小，导致电芯壳体100与电芯壳盖200的焊接强度较小，电化学装置10可能因受力或环境变化导致电芯壳体100与电芯壳盖200之间产生间隙或者分离，影响电化学装置10的可靠性。
本申请实施例中，通过使得焊接部210在底壁110的厚度方向上的深度H，焊接部210在侧壁120的厚度方向上的宽度W4满足H≥0.5*T1，W4≥T1，能够使得电芯壳体100与电芯壳盖200的焊接强度较高，电芯壳体100和电芯壳盖200的连接稳固，电化学装置10的密封性较好，电化学装置10不易因受力或环境变化导致电芯壳体100与电芯壳盖200之间产生间隙或者分离，电化学装置的10可靠性较高。若H、W4较小(例如H小于0.5*T1，W4小于T1)，则电芯壳体100 与电芯壳盖200的焊接强度较低，电化学装置10可能因受力或环境变化导致电芯壳体100与电芯壳盖200之间产生间隙或者分离，影响电化学装置10的可靠性。
在一些实施例中，焊接部210的部分凸出于电芯壳盖200的侧边，且凸出的部分的外表面为弧形面。
在目前的焊接方式中，焊接部部210是形成于电芯壳体100和电芯壳盖200之间，且位于电芯壳体100和电芯壳盖200的内部，即与电芯壳体100和电芯壳盖200的侧边间隔，焊接部210的体积较小，使得电芯壳体100和电芯壳盖200之间的连接强度较低。
本申请实施例中，使得焊接部210的部分凸出于电芯壳盖200的侧边，能够使得焊接部210的体积较大，电芯壳体100与电芯壳盖200之间的连接强度更高，电芯壳体100和电芯壳盖200的连接稳固，电化学装置10的密封性较好，电化学装置10不易因受力或环境变化导致电芯壳体100与电芯壳盖200之间产生间隙或者分离，电化学装置10的可靠性较高。
在一些实施例中，焊接部210的部分也可以同时凸出于电芯壳体100和电芯壳盖200的侧边。
若焊接部210凸出于电芯壳盖200的部分的外表面具有棱角，则在焊接部210与其他装置产生干涉时，焊接部210容易存在应力集中而导致受损的问题，并且容易破坏其他装置。本申请实施例中，使得焊接部210凸出于电芯壳盖200的部分的外表面为弧形面，能够在焊接部210与其他装置产生干涉时，减小焊接部210和其他装置受损的可能性。
表1电化学装置的能量密度提升及焊接强度提升
参见表1，表1中的T1为电芯壳体的侧壁的壁厚，W1为电芯壳体的过渡面的宽度，W2为电芯壳体的法兰面的宽度，W3为电芯壳体的法兰部凸出于侧壁的外表面的部分的宽度，T2为电芯壳体的法兰部凸出于侧壁的外表面的部分的厚度，T3为电芯壳盖的厚度，Q1为对比例2及实施例1-13相比对比例1的能量密度提升率，Q2为对比例2及实施例1-13相比对比例1的焊接强度提升率，Q3为对比例2及实施例1-13相比对比例1的焊接强度提升值。其中，各部位的厚度、宽度的单位都为mm，焊接强度值的单位为N/mm。对比例1中为电芯壳体未设置法兰部，电芯壳盖直 接与电芯壳体的侧壁顶面连接的方式，对比例2中为电芯壳体设置法兰部，但未对法兰部进行处理的方式。
电芯壳体与电芯壳体的焊接强度测量方法为：将焊接好的电芯壳体与电芯壳体的沿焊缝的垂直方向切割预定的宽度S，并将样品对折成T字形，使用高铁拉力机将焊缝两端的金属部件拉开，测得的最大拉力值为F，那么焊接强度即为：F/S。
根据表1可以得到以下结论：
1、参见对比例1和对比例2，通过在电芯壳体设置法兰部，能够减小电芯壳体的壁厚T1，提高电化学装置的能量密度和电芯壳体与电芯壳体的焊接强度。
2、参见对比例2、实施例1、实施例4、实施例11，随着电芯壳体的过渡面的宽度W1的减小，电芯壳体的壁厚T1减小，进而能够提高电化学装置的能量密度。
3、分别参见实施例1-3，实施例4-6，实施例11-13，随着电芯壳体的法兰面的宽度W2的减小，电芯壳体的法兰部凸出于侧壁的外表面的部分的宽度W3也减小，能够提高电化学装置的能量密度，但电芯壳体与电芯壳体的焊接强度降低。
4、参见实施例1-3，实施例8-10，电芯壳体的法兰面的宽度W2的减小，但是电芯壳体的法兰部凸出于侧壁的外表面的部分的厚度T2不变时，能够提高电化学装置的能量密度，但是对电芯壳体与电芯壳体的焊接强度的影响较小。
5、参见实施例7和实施例12，电芯壳体的过渡面的宽度W1不变，电芯壳体的法兰面的宽度W2，电芯壳体的法兰部凸出于侧壁的外表面的部分的宽度W3增大，能够减小电芯壳体的壁厚T1，从而能够提高电化学装置的能量密度。
6、参见实施例6和8，电芯壳体的过渡面的宽度W1不变，电芯壳体的法兰部凸出于侧壁的外表面的部分的厚度T2不变，电芯壳体的法兰面的宽度W2变大，但是电芯壳体的壁厚T1变小，会对电芯壳体与电芯壳体的焊接强度产生较大的影响。
表2电化学装置的焊接强度测试
参见表2，表2中的T1为电芯壳体的侧壁的壁厚(在测试的对比例和实施例中，电芯壳体的底壁的壁厚与侧壁的壁厚相等)，T3为电芯壳盖的厚度，W3为电芯壳体的法兰部凸出于侧壁 的外表面的部分的宽度。对比例1中为电芯壳体未设置法兰部，电芯壳盖直接与电芯壳体的侧壁顶面连接的方式，对比例2中为电芯壳体设置法兰部，但未对法兰部进行处理的方式。实施例4为表1中实施例4的电化学装置。
根据表2可以看出，实施例4相比对比例1，电芯壳体的法兰部凸出于侧壁的外表面的部分的宽度W3相等，电芯壳体的侧壁的壁厚T1更小，电化学装置的焊接强度得到较大提高，具体的，焊接强度平均提高43.87％，同时结合表1，电化学装置的能量密度也提升了2.26％。实施例4相比对比例2，电芯壳体的侧壁的壁厚T1相等，电芯壳体的法兰部凸出于侧壁的外表面的部分的宽度W3更小，电化学装置的焊接强度得到较大提高，具体的，焊接强度平均提高30.15％，同时结合表1，电化学装置的能量密度也提升了2.2％。
由此可知，本申请提供的实施例能够增大容纳空间的体积，增大电化学装置的能量密度，还能够使得电芯壳体与电芯壳体之间具有较高的焊接强度。
本申请实施例提供一种用电设备，包括以上任一方案的电化学装置10，电化学装置10用于为用电设备提供电能。
用电设备可以是前述任一应用电化学装置10的设备或系统。
参见图11，图11为本申请一些实施例提供的电化学装置的制备方法的流程示意图。电化学装置的制备方法包括：
S410、对原料板进行冲压，以形成电芯壳体。
在一些实施例中，原料板可以为钢板，也可以为其他金属板。
S420、在冲压过程中，通过拍平和挤负角的方式将电芯壳体的法兰部的过渡面向电芯壳体的内侧挤压成型，以使得过渡面在电芯壳体的侧壁的厚度方向上的宽度W1和电芯壳体的侧壁的壁厚T1满足0＜W1≤T1。
在另一些实施例中，也可以只通过拍平的方式将电芯壳体的法兰部的过渡面向电芯壳体的内侧挤压成型，或者只通过挤负角的方式将电芯壳体的法兰部的过渡面向电芯壳体的内侧挤压成型。
在另一些实施例中，也可以在冲压后，对电芯壳体的法兰部进行加工，使得过渡面在电芯壳体的侧壁的厚度方向上的宽度W1和电芯壳体的侧壁的壁厚T1满足0＜W1≤T1。
S430、将电极组件安装于电芯壳体的容纳空间内。
在一些实施例中，将电极组件放置于容纳空间内后，使得电极组件的第一电连接件与电芯壳体的极柱连接，使得电极组件的第二电连接件与电芯壳体连接，以实现电极组件的安装。
S440、将电芯壳盖盖设于电芯壳体的开口，并将电芯壳盖与电芯壳体固定连接。
在一些实施例中，将电芯壳盖与电芯壳体固定连接后，还需通过电芯壳体的注液孔向电芯壳体的容纳空间内注入电解液，并封堵注液孔，电解液浸润电极组件后，电化学装置可正常工作。
在冲压过程中通过拍平和挤负角的方式使得电芯壳体的过渡面在电芯壳体的侧壁的厚度方向上的宽度W1和电芯壳体的侧壁的壁厚T1满足0＜W1≤T1，使得电芯壳体的法兰面的宽度较大，同时电芯壳体的法兰部凸出于侧壁的部分的宽度较小，从而能够增大容纳空间的体积，增大电化学装置的能量密度，并且能够使得侧壁的壁厚较小，从而进一步增大容纳空间的体积，增大电化学装置的能量密度。若W1较大(例如大于T1)，则有可能造成法兰面的宽度较小或法兰部凸出于侧壁的部分的宽度较大，法兰面的宽度较小可能会影响电芯壳体与电芯壳盖的连接强度，法兰部凸出于侧壁的部分的宽度较大则可能压缩容纳空间，影响电化学装置的能量密度。
在一些实施例中，将电芯壳盖与电芯壳体固定连接的方法包括：通过摆动焊的方式将电芯壳盖与电芯壳体焊接连接。
摆动焊即使得激光来回摆动，以在电芯壳体和电芯壳盖之间形成沿曲线延伸的焊接部，能够增大焊接部的面积。
线焊即使得激光沿直线运动，以在电芯壳体和电芯壳盖之间形成沿直线延伸的焊接部。
由于摆动焊需要预留一定的焊接宽度，目前电芯壳盖与电芯壳体预留的焊接宽度较窄的结构中不易采用摆动焊进行焊接，一般采用线焊等方式。而本申请实施例中，电芯壳体的过渡面在电芯壳体的侧壁的厚度方向上的宽度W1和电芯壳体的侧壁的壁厚T1满足0＜W1≤T1，能够使得电芯壳体的法兰面的宽度较大，便于采用摆动焊方式。
通过摆动焊的方式将电芯壳盖与电芯壳体焊接连接，相比线焊等方式，能够增大焊接部的面积，从而进一步增加电芯壳体与电芯壳盖的焊接强度，使得电芯壳体和电芯壳盖的连接稳固，电 化学装置的密封性较好，电化学装置不易因受力或环境变化导致电芯壳体与电芯壳盖之间产生间隙或者分离，电化学装置的可靠性较高。
在另一些实施例中，也可以通过线焊等方式将电芯壳盖与电芯壳体焊接连接。
需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互结合。
以上仅为本申请的优选实施例而已，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (22)

  1. 一种电芯壳体，其特征在于，包括底壁、侧壁和法兰部，所述侧壁围设于所述底壁的周围，并和所述底壁共同围成具有开口的容纳空间，所述法兰部设置于所述侧壁远离所述底壁的一端，所述法兰部的至少一部分凸出于所述侧壁的内表面和/或外表面；
    其中，所述法兰部具有法兰面和过渡面，所述法兰面大致垂直所述侧壁，且用于与电芯壳盖连接；所述过渡面弯曲连接所述法兰面和所述侧壁的内表面和/或外表面，所述过渡面在所述侧壁的厚度方向上的宽度为W1，所述侧壁的壁厚为T1，满足0＜W1≤T1。
  2. 根据权利要求1所述的电芯壳体，其特征在于，0＜W1≤0.7*T1。
  3. 根据权利要求1所述的电芯壳体，其特征在于，所述法兰面在所述侧壁的厚度方向上的宽度为W2，满足W2≥0.7*T1。
  4. 根据权利要求1所述的电芯壳体，其特征在于，所述法兰面为平面，所述过渡面为弧形面。
  5. 根据权利要求1所述的电芯壳体，其特征在于，所述法兰部的至少一部分凸出于所述侧壁的外表面，所述法兰部凸出于所述侧壁的外表面的部分在所述侧壁的厚度方向上的宽度为W3，满足0.05mm≤W3≤0.3mm。
  6. 根据权利要求5所述的电芯壳体，其特征在于，0.05mm≤W3≤0.15mm。
  7. 根据权利要求1所述的电芯壳体，其特征在于，所述法兰部的至少一部分凸出于所述侧壁的外表面，所述法兰部凸出于所述侧壁的外表面的部分的厚度为T2，满足0.7*T1≤T2≤1.1*T1。
  8. 根据权利要求1所述的电芯壳体，其特征在于，0.05mm≤T1≤0.15mm。
  9. 根据权利要求8所述的电芯壳体，其特征在于，0.05mm≤T1≤0.1mm。
  10. 根据权利要求1所述的电芯壳体，其特征在于，所述法兰部对应所述过渡面的部分的厚度为T3，满足T3＞T1。
  11. 根据权利要求10所述的电芯壳体，其特征在于，所述T3满足：T1<T3<1.5*T1。
  12. 根据权利要求1所述的电芯壳体，其特征在于，所述法兰部对应所述过渡面的部分的厚度为T3，满足0.06mm≤T3≤0.2mm。
  13. 根据权利要求12所述的电芯壳体，其特征在于，所述T3满足：0.09mm≤T3≤0.12mm。
  14. 一种电化学装置，其特征在于，包括如权利要求1至13任一项所述的电芯壳体、电芯壳盖、电极组件，所述电极组件容置于所述容纳空间内，所述电芯壳盖盖设于所述开口。
  15. 根据权利要求14所述的电化学装置，其特征在于，所述电芯壳盖沿第一方向的长度为D1，所述电芯壳盖沿第二方向的长度为D2，所述电芯壳体沿所述第一方向的长度为D3，所述电芯壳体沿所述第二方向的长度为D4，满足D1≤D3，D2≤D4；所述第一方向、所述第二方向和所述电芯壳盖的厚度方向两两垂直。
  16. 根据权利要求14所述的电化学装置，其特征在于，所述电芯壳体沿所述第一方向的两侧超出所述电芯壳盖的长度分别为E1和E2，所述电芯壳体沿所述第二方向的两侧超出所述电芯壳盖的长度分别为E3和E4，E1、E2、E3、E4的平均值为ˉE，满足ˉE≤0.05mm。
  17. 根据权利要求14所述的电化学装置，其特征在于，所述电芯壳体和所述电芯壳盖为焊接连接或粘接连接。
  18. 根据权利要求14所述的电化学装置，其特征在于，所述电芯壳体和所述电芯壳盖为焊接连接，所述电芯壳体与所述电芯壳盖之间形成焊接部，所述焊接部在所述底壁的厚度方向上的深度为H，所述焊接部在所述侧壁的厚度方向上的宽度为W4，满足H≥0.5*T1，W4≥T1。
  19. 根据权利要求14所述的电化学装置，其特征在于，所述电芯壳体和所述电芯壳盖为焊接连接，所述电芯壳体与所述电芯壳盖之间形成焊接部，所述焊接部的部分凸出于所述电芯壳盖的侧边，且凸出的部分的外表面为弧形面。
  20. 一种用电设备，其特征在于，包括如权利要求14至19任一项所述的电化学装置，所述电化学装置用于提供电能。
  21. 一种电化学装置的制备方法，其特征在于，包括：
    对原料板进行冲压，以形成电芯壳体；
    在冲压过程中，通过拍平和挤负角的方式将所述电芯壳体的法兰部的过渡面向所述电芯壳体的内侧挤压成型，以使得所述过渡面在电芯壳体的侧壁的厚度方向上的宽度W1和所述电芯壳体的侧壁的壁厚T1满足0＜W1≤T1；
    将电极组件安装于所述电芯壳体的容纳空间内；
    将电芯壳盖盖设于电芯壳体的开口，并将所述电芯壳盖与所述电芯壳体固定连接。
  22. 根据权利要求21所述的方法，其特征在于，将所述电芯壳盖与所述电芯壳体固定连接的方法包括：
    通过摆动焊的方式将所述电芯壳盖与所述电芯壳体焊接连接。
PCT/CN2024/100231 2023-07-14 2024-06-19 电芯壳体、电化学装置及其制备方法、用电设备 Pending WO2025016142A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202310870108.5 2023-07-14
CN202310870108.5A CN116864876A (zh) 2023-07-14 2023-07-14 电芯壳体、电化学装置及其制备方法、用电设备

Publications (2)

Publication Number Publication Date
WO2025016142A1 true WO2025016142A1 (zh) 2025-01-23
WO2025016142A9 WO2025016142A9 (zh) 2026-02-19

Family

ID=88228352

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2024/100231 Pending WO2025016142A1 (zh) 2023-07-14 2024-06-19 电芯壳体、电化学装置及其制备方法、用电设备

Country Status (2)

Country Link
CN (1) CN116864876A (zh)
WO (1) WO2025016142A1 (zh)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116864876A (zh) * 2023-07-14 2023-10-10 宁德新能源科技有限公司 电芯壳体、电化学装置及其制备方法、用电设备
CN118919969B (zh) * 2024-10-09 2025-02-25 蜂巢能源科技股份有限公司 电芯及电池包
CN120089914A (zh) * 2025-04-29 2025-06-03 蜂巢能源科技股份有限公司 电池外壳及电池

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060178708A1 (en) * 2002-09-30 2006-08-10 Rorvick Anthony W Electrochemical cell for implantable medical devices
WO2016043017A1 (ja) * 2014-09-18 2016-03-24 株式会社神戸製鋼所 車載電池用の角形電池ケースおよびその製造方法
KR20190104688A (ko) * 2018-03-02 2019-09-11 주식회사 엘지화학 비딩부가 생략된 원통형 전지 및 이의 제조방법
DE102020206240A1 (de) * 2020-05-18 2021-11-18 Volkswagen Aktiengesellschaft Batteriegehäuse für eine Hochvoltbatterie
CN114597610A (zh) * 2022-03-26 2022-06-07 珠海冠宇电池股份有限公司 电池
CN114614214A (zh) * 2022-03-26 2022-06-10 珠海冠宇电池股份有限公司 电池
CN114665233A (zh) * 2022-03-26 2022-06-24 珠海冠宇电池股份有限公司 电池
CN217719778U (zh) * 2022-05-20 2022-11-01 宁德时代新能源科技股份有限公司 壳体、电池单体、电池及用电设备
CN218385441U (zh) * 2022-07-27 2023-01-24 宁德时代新能源科技股份有限公司 电池单体的壳体、电池单体、电池和用电装置
CN219321521U (zh) * 2022-12-30 2023-07-07 宁德时代新能源科技股份有限公司 箱体、箱体组件、电池及用电装置
CN116864876A (zh) * 2023-07-14 2023-10-10 宁德新能源科技有限公司 电芯壳体、电化学装置及其制备方法、用电设备
WO2023221104A1 (zh) * 2022-05-20 2023-11-23 宁德时代新能源科技股份有限公司 壳体、电池单体、电池和用电装置

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060178708A1 (en) * 2002-09-30 2006-08-10 Rorvick Anthony W Electrochemical cell for implantable medical devices
WO2016043017A1 (ja) * 2014-09-18 2016-03-24 株式会社神戸製鋼所 車載電池用の角形電池ケースおよびその製造方法
KR20190104688A (ko) * 2018-03-02 2019-09-11 주식회사 엘지화학 비딩부가 생략된 원통형 전지 및 이의 제조방법
DE102020206240A1 (de) * 2020-05-18 2021-11-18 Volkswagen Aktiengesellschaft Batteriegehäuse für eine Hochvoltbatterie
CN114597610A (zh) * 2022-03-26 2022-06-07 珠海冠宇电池股份有限公司 电池
CN114614214A (zh) * 2022-03-26 2022-06-10 珠海冠宇电池股份有限公司 电池
CN114665233A (zh) * 2022-03-26 2022-06-24 珠海冠宇电池股份有限公司 电池
CN217719778U (zh) * 2022-05-20 2022-11-01 宁德时代新能源科技股份有限公司 壳体、电池单体、电池及用电设备
WO2023221104A1 (zh) * 2022-05-20 2023-11-23 宁德时代新能源科技股份有限公司 壳体、电池单体、电池和用电装置
CN218385441U (zh) * 2022-07-27 2023-01-24 宁德时代新能源科技股份有限公司 电池单体的壳体、电池单体、电池和用电装置
CN219321521U (zh) * 2022-12-30 2023-07-07 宁德时代新能源科技股份有限公司 箱体、箱体组件、电池及用电装置
CN116864876A (zh) * 2023-07-14 2023-10-10 宁德新能源科技有限公司 电芯壳体、电化学装置及其制备方法、用电设备

Also Published As

Publication number Publication date
WO2025016142A9 (zh) 2026-02-19
CN116864876A (zh) 2023-10-10

Similar Documents

Publication Publication Date Title
WO2025016142A1 (zh) 电芯壳体、电化学装置及其制备方法、用电设备
CN102738428B (zh) 二次电池
CN218586157U (zh) 电池单体、电池以及用电装置
CN115425372B (zh) 电极极片、电极组件、电池单体、电池和用电设备
CN116529948A (zh) 电池单体、电池以及用电装置
KR101253671B1 (ko) 리튬 이차전지 및 그 제조방법
WO2023185283A1 (zh) 电池
CN219575884U (zh) 电池单体、电池及用电装置
CN217485584U (zh) 端盖、电池单体、电池及用电设备
CN218498208U (zh) 电池单体、电池以及用电装置
JP2015504582A (ja) 電気コネクタおよびそれを備える電池
CN114614214A (zh) 电池
CN115332696A (zh) 电池及用电设备
WO2025171771A1 (zh) 电芯及用电设备
WO2026061171A1 (zh) 电芯及用电设备
CN217507616U (zh) 电池
CN219106333U (zh) 连接结构、盖板组件及电池
CN219246881U (zh) 电池单体、电池包及车辆
CN218414807U (zh) 电池单体、电池及用电装置
CN215451563U (zh) 纽扣电池
CN116895917A (zh) 锂离子钮扣电池及其制作方法
WO2024082112A1 (zh) 电池单体、电池以及用电装置
CN116848720B (zh) 集流构件、电化学装置及用电装置
CN223245718U (zh) 电池和电池模组
CN218385655U (zh) 电池

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 24842141

Country of ref document: EP

Kind code of ref document: A1

REG Reference to national code

Ref country code: BR

Ref legal event code: B01A

Ref document number: 112026000837

Country of ref document: BR

WWE Wipo information: entry into national phase

Ref document number: 202617015583

Country of ref document: IN

WWE Wipo information: entry into national phase

Ref document number: 2024842141

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: DE