CN116169437B

CN116169437B - Energy storage device, electric equipment and manufacturing method of energy storage device

Info

Publication number: CN116169437B
Application number: CN202310331645.2A
Authority: CN
Inventors: 熊永锋
Original assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2023-03-30
Filing date: 2023-03-30
Publication date: 2024-07-23
Anticipated expiration: 2043-03-30
Also published as: CN116169437A

Abstract

The application provides an energy storage device, electric equipment and a manufacturing method of the energy storage device. The energy storage device includes: the housing has an opening. The electrode assembly is accommodated in the case. The adaptor is installed in the casing, and the adaptor includes body, connecting portion and first through-hole, and the body includes first surface and the second surface that set up along the axial of first through-hole is opposite to each other, and the first surface is located to the connecting portion, and the second surface electricity is connected in electrode assembly. The first through hole penetrates through the body and the connecting portion, the connecting portion is provided with a welding area, and the welding area surrounds the first through hole. The end cover is covered on the opening of the shell, and the edge of the end cover is abutted with the edge of the opening of the shell; the end cover is provided with a second through hole, the connecting part penetrates through the second through hole, at least part of the welding area is exposed out of the second through hole, and the outer peripheral surface of the welding area is attached to the peripheral surface of the second through hole. The sealing element is arranged on the connecting part and seals the first through hole, the sealing element is connected with the welding area, and welding is carried out on the welding area so as to fixedly connect the sealing element, the connecting part and the end cover.

Description

Energy storage device, electric equipment and manufacturing method of energy storage device

Technical Field

The application relates to the technical field of energy storage, in particular to an energy storage device, electric equipment and a manufacturing method of the energy storage device.

Background

Energy storage devices, such as secondary batteries, are also referred to as rechargeable batteries or accumulators, and refer to batteries that can be used continuously by activating active substances by means of charging after the discharge of the battery. The recyclable property of the secondary battery makes the secondary battery gradually become a main power source of electric equipment. As the demand for secondary batteries has increased, performance requirements for various aspects thereof have increased, particularly for the cycle performance and safety performance of secondary batteries.

In the conventional secondary battery production process, the secondary battery is often required to be in: the aluminum sheet and the current collecting disc are welded; the current collecting disc and the electrode assembly are welded; the aluminum sheet and the shell are subjected to laser seal welding; and (5) welding the sealing nails of the liquid injection holes. In the secondary battery production process, multiple welding is needed, the process steps are complicated, and the process progress is seriously influenced.

Disclosure of Invention

The application provides an energy storage device capable of welding an end cover, a sealing element and an adapter at one time, electric equipment and a manufacturing method of the energy storage device.

In a first aspect, an embodiment of the present application provides an energy storage device. The energy storage device comprises a shell, an electrode assembly, an adapter, an end cover and a sealing piece. The housing has an opening. The electrode assembly is accommodated in the case. The adaptor is installed in the casing, the adaptor includes body, connecting portion and first through-hole, the body has along the axial of first through-hole sets up first surface and second surface that is opposite to each other, connecting portion locate first surface, the second surface electricity connect in electrode assembly. The first through hole penetrates through the body and the connecting portion, a welding area is arranged on the connecting portion, and the welding area surrounds the first through hole. The end cover is covered on the opening of the shell, and the edge of the end cover is abutted with the edge of the opening of the shell; the end cover is provided with a second through hole, the connecting part penetrates through the second through hole, the welding area is exposed out of the second through hole, and the outer peripheral surface of the welding area is attached to the peripheral surface of the second through hole. The sealing element is arranged on the connecting part and seals the first through hole, the sealing element is connected with the welding area, and the welding area is welded to fixedly connect the sealing element, the connecting part and the end cover.

In the energy storage device, the connecting part of the adapter is provided with the welding area, and the welding area is arranged around the first through hole. When the adapter and the end cover are assembled, the outer peripheral surface of the welding area is attached to the peripheral surface of the second through hole in the end cover (namely, the peripheral surface of the second through hole surrounded by the end cover). When the sealing element is assembled at the connecting part and seals the first through hole, the sealing element is connected with the welding area, and when the adapter, the end cover and the sealing element are welded, welding treatment can be carried out at the welding area, and the welding area can be filled with molten welding area and at least part of the sealing element along the two radial sides of the first through hole, so that the adapter, the end cover and the sealing element can be welded together at one time, and the welding times in the process of assembling the energy storage device can be reduced relative to the welding between the adapter and the end cover and between the adapter and the sealing element respectively, and the production efficiency is improved. In addition, the adapter, the end cover and the sealing piece are fixedly connected only through one-time welding, so that the phenomenon that welding slag falls into the electrode assembly to cause short circuit due to repeated welding process is avoided, and the performance of the energy storage device is ensured.

In one possible embodiment, the outer circumferential surface of the seal member is fitted to the inner circumferential surface of the welding zone.

It can be seen that, after the sealing member is assembled at the connecting portion and seals the first through hole, that is, the sealing member is embedded in the space surrounded by the inner peripheral surface of the welding area, when the sealing member is welded with the welding area, the welding area is at least partially exposed out of the second through hole, the welding area can provide a stable and visible welding position, the welding condition among the end cover, the adapting member and the sealing member is visual, the condition of virtual welding or wrong welding is avoided, and the production efficiency can be further improved.

In one possible embodiment, the welding zone has a first face, which is the face of the welding zone facing away from the body, against which the seal abuts.

It can be seen that when the sealing member is assembled on the end cover and the adapter, the bottom surface of the sealing member (i.e. the surface of the sealing member, which is close to the body) can be abutted against the first surface, when the welding area is welded, the molten at least part of the sealing member and the molten welding area fill the gap between the peripheral surface of the welding area and the peripheral surface of the second through hole, the bottom surface of the sealing member is abutted against the first surface of the welding area, the connection of the sealing member and the adapter is realized by the molten at least part of the sealing member and the molten welding area, namely, the connection of two pairs is realized by one-time welding among the sealing member, the adapter and the end cover, the welding times are reduced, and the production efficiency is improved.

In one possible embodiment, the first face is lower than the upper surface of the end cap facing away from the adapter in the axial direction of the first through hole; the outer peripheral surface of the sealing member is attached to the peripheral surface of the second through hole.

It will be appreciated that along the axial direction of the first through hole, the first face is lower than the upper surface of the end cap, so that an accommodating space is formed between the first face and the peripheral surface of the second through hole, the sealing member may be accommodated in the accommodating space, at this time, the peripheral surface of the sealing member is attached to the peripheral surface of the second through hole, for example, along the axial direction of the first through hole, the surface of the sealing member facing away from the body may be flush with the upper surface of the end cap, or the surface of the sealing member facing away from the body may be lower than the upper surface of the end cap, wherein the surface of the sealing member facing away from the body may be a flat surface. So, weld the district in the welding district, the part of the welding district of melting will fill the gap between peripheral face and second through hole of the welding district, and the sealing member is in contact with the first surface, after the welding is finished, the surface facing away from the body of sealing member can be lower than the upper surface of the end cover, avoid the surface facing away from the body of sealing member to hinder the installation of the electric connecting piece (such as aluminium bar); and when the welding area welds, at the one side of the welding area that deviates from the body, the fused welding area is difficult to surpass the gap between the peripheral face of sealing member and the global laminating of second through-hole, and the welding slag that produces after the welding area welding can not expose in the upper surface of end cover, ensures that the upper surface of end cover is the smooth surface, guarantees the stability that electric connector and end cover are connected.

In one possible embodiment, the width of the bonding region is 800 micrometers or more and 1800 micrometers or less in the radial direction of the first through hole.

It can be seen that the welding area is disposed around the first through hole, the welding area is a ring, and the width of the welding area is the distance that the welding area of the ring structure extends along the radial direction of the first through hole. If the width of the welding area is less than 800 micrometers, the area of the welding area is too small, when the end cover, the adapter and the sealing element are welded together by the welding area, the welding area is too small, so that the connection strength among the end cover, the adapter and the sealing element is too weak, after the internal pressure of the energy storage device is increased, the sealing element is easy to fall off from the connection part, and the tightness of the energy storage device is poor after welding. If the width of the welding area is greater than 1800 microns, the area of the welding area is too large, and when the welding area is welded, the area required to be welded is too large, so that the welding duration is prolonged, and the production efficiency is reduced. The width of the welding area is set to be more than or equal to 800 micrometers and less than or equal to 1800 micrometers, the welding area of the welding area is ensured to be in a proper range, the connection strength among the end cover, the adapter and the sealing element is ensured, the energy storage device after welding is ensured to have better tightness, the end cover, the adapter and the sealing element are ensured to be welded and formed at one time, the welding time length increase caused by the overlarge area of the welding area is avoided, and the welding efficiency and the production efficiency of the energy storage device are further improved.

In one possible embodiment, the height of the land is 600 microns or more and 1200 microns or less along the axial direction of the first through hole.

It can be seen that if the height of the welding area is less than 600 micrometers, when the welding area welds the end cover, the adapter and the sealing member together, the welding depth of the welding area is small, so that the connection strength among the end cover, the adapter and the sealing member is too weak, and when the internal pressure of the energy storage device is increased, the sealing member is easy to fall off from the connection part, and the tightness of the energy storage device is poor after welding. If the height of the welding area is more than 1200 micrometers, the thickness of the welding area to be welded is thicker, and the welding time length is prolonged. The height of the welding area is set to be more than or equal to 600 micrometers and less than or equal to 1200 micrometers, the welding thickness of the welding area is ensured to be in a proper range, the connection strength among the end cover, the adapter and the sealing element is ensured, the energy storage device after welding is ensured to have better sealing performance, the end cover, the adapter and the sealing element are ensured to be welded and formed at one time, the increase of welding time length caused by overlarge height of the welding area is avoided, and the welding efficiency and the production efficiency of the energy storage device are further improved.

In one possible embodiment, the welding zone has a first face, which is a surface of the welding zone facing away from the body, the first face having a roughness of 1.6Ra or more and 3.2Ra or less.

It can be seen that the first surface is the surface of the welding area exposed out of the second through hole, the roughness of the first surface is limited to be more than or equal to 1.6Ra and less than or equal to 3.2Ra, so that the first surface is rough, when the welding area is subjected to laser welding, the smooth first surface is prevented from reflecting light, and further the phenomenon that the welding temperature cannot reach a preset value to form virtual welding is avoided, and meanwhile, the laser equipment lens is prevented from being damaged by light beams reflected by the first surface and the phenomenon of blue explosion in the welding area is avoided.

In one possible embodiment, the soldering zone has a first face, which is the surface of the soldering zone facing away from the body, which is provided with a stop surrounding the first through hole.

It can be seen that the blocking part of the annular structure is arranged on the first surface of the welding area, and when laser equipment is adopted to perform laser welding towards the welding area, laser beams can diffuse-reflect on the blocking part and the first surface, so that the absorption rate of laser energy is further improved, the welding cost is reduced, and the production efficiency is improved.

In one possible embodiment, the blocking portion includes a plurality of first sections, the plurality of first sections being disposed on the first face in a radial arrangement of the first through holes, each of the first sections surrounding the first through hole, the first sections tapering away from the first face.

It can be seen that the first sections gradually shrink along with being far away from the first surface, for example, when the longitudinal section of the first sections parallel to the axial direction of the first through hole is triangular, the first sections are in a ring-shaped triangular prism structure, and the plurality of first sections are arranged on the first surface in the radial direction of the first through hole, namely, the plurality of first sections are concentric rings; along the radial direction of the first through hole, a space can exist between two adjacent first sections, and the two adjacent first sections can also be abutted against each other. So, on first face, a plurality of first subdivisions are the ripple structure, when the welded zone carries out laser welding, a plurality of first subdivisions can carry out diffuse reflection with laser beam at the surface and the first face of a plurality of first subdivisions, further promotes the absorptivity of laser energy, reduces welding cost, promotes production efficiency. Meanwhile, the first branches with the triangular longitudinal sections are melted and filled in gaps between the two first branches after absorbing laser beams, so that welding marks caused by insufficient welding materials in a welding area are avoided, the structural strength is reduced, and the safety performance of the energy storage device is improved.

In one possible embodiment, a longitudinal section of the blocking portion parallel to the axial direction of the first through hole includes a trapezoid-like shape, and an outer circumferential surface of the blocking portion is a cambered surface concave inward toward the center of the first through hole.

It can be seen that when the longitudinal section of the blocking portion parallel to the axial direction of the first through hole is trapezoid-like, the blocking portion is of a ring-like trapezoid-like structure, the outer circumferential surface of the blocking portion is an arc surface, specifically, the outer circumferential surface of the blocking portion is an arc surface concave inwards towards the center of the first through hole, and when the laser beam is obliquely incident towards the arc surface of the blocking portion, the laser beam can be prevented from being directly reflected to the blocking portion or the first surface; meanwhile, the cambered surface of the blocking part has the function of collecting the light beams, so that the laser light beams reflected to the cambered surface of the blocking part can be collected, and the absorptivity of the laser light beams is further improved; in addition, when the cambered surface of the blocking part is irradiated by the laser beam, the blocking part melts to be liquid when being heated to reach the melting point, so that gaps on the inner side and the outer side of the blocking part can be filled, and the connection strength of the end cover, the adapter and the sealing element is further improved.

In one possible implementation manner, the connecting portion includes a first boss and a second boss, the first boss is connected with the body, the second boss is arranged on one face, away from the body, of the first boss, the first boss is located between the body and the second boss, the first through hole penetrates through the body, the first boss and the second boss, the welding area is arranged on one face, away from the first boss, of the second boss, and the outer peripheral face of the second boss is attached to the peripheral face of the second through hole.

It can be seen that, along the axial direction of the first through hole, the body is sequentially provided with a first boss, a second boss and a welding area, the first through hole penetrates through the body, the first boss and the second boss, and the welding area surrounds the first through hole, and when the liquid (electrolyte) injection procedure is carried out, electrolyte can be injected into the electrode assembly in the shell through the first through hole. The arrangement of the first boss and the second boss enables a certain interval to exist between the end cover and the body, and gas generated by the circulation of the energy storage device can pass through the interval between the end cover and the body to the explosion-proof valve, so that the exhaust depressurization effect is improved. In addition, the outer peripheral surface of the welding area is attached to the peripheral surface of the second through hole, the outer peripheral surface of the second boss is attached to the peripheral surface of the second through hole, part of welding slag generated in welding of the welding area can be accumulated at a gap between the second boss and the peripheral surface of the second through hole, and the welding slag of the welding area is prevented from directly falling onto the electrode assembly, so that the performance of the energy storage device is ensured. In the application, the size of the first boss is larger than that of the second boss along the radial direction of the first through hole, so that welding slag generated in a welding area can be accumulated on the first boss, and the welding slag is prevented from directly falling onto the electrode assembly.

In one possible implementation manner, the inner peripheral surface of the welding area is surrounded by a mounting hole, the mounting hole is communicated with the first through hole, the diameter of the mounting hole is larger than that of the first through hole, and the sealing element is mounted in the mounting hole and seals the first through hole.

It can be seen that, along the axial direction of the first through hole, one side of the first through hole, far away from the electrode assembly, is also provided with a mounting hole, when the sealing element is mounted in the mounting hole, the sealing element can be abutted against the surface, deviating from the first boss, of the second boss, and the outer peripheral surface of the sealing element is abutted against the inner peripheral surface of the welding area, so that the contact area between the switching element and the sealing element can be further increased, and the overcurrent capacity of the switching element is enhanced; the diameter of the mounting hole is larger than that of the first through hole, so that the sealing element can be prevented from sliding down from the mounting hole towards the inside of the first through hole, and the sealing element can completely shield and seal the first through hole.

In one possible embodiment, the inner peripheral surface of the welding area has a first inclined surface, and the sealing member is mounted to the mounting hole along the first inclined surface.

It can be seen that the portion of the inner peripheral surface of the welding area (e.g., the end of the inner peripheral surface, which is far away from the second boss) may be set to be a first inclined surface, or the inner peripheral surface of the welding area is integrally set to be a first inclined surface, and when the sealing element is assembled, the sealing element can be installed in the installation hole by extruding down along the first inclined surface, so that the assembly of the sealing element is simpler and more convenient.

In one possible embodiment, the end cover includes a main body portion and a protruding portion, the protruding portion extends from an end of an outer circumferential surface of the main body portion, which is far away from the adapter, in a radial direction of the first through hole, the main body portion abuts against the first boss, and the protruding portion abuts against the housing.

It can be seen that when the end cover is covered on the shell, the protruding part is abutted on the shell, and the abutting part of the protruding part and the shell is welded, so that the sealing welding of the end cover and the shell is realized. In addition, the main body part is abutted on the first boss of the adapter, so that the contact area between the adapter and the end cover can be increased, and the overcurrent capacity of the adapter is increased; and main part butt is on first boss, along the axial of first through-hole for there is certain interval between the body of end cover and adaptor, and the gas that energy storage device circulation produced accessible end cover and the interval between the body is led to explosion-proof valve department, promotes the effect of exhaust depressurization. In addition, the main body part is abutted on the first boss, so that welding slag generated during welding in the welding area can be further prevented from falling into the electrode assembly.

In one possible embodiment, the outer peripheral surface of the second boss has a second inclined surface, and the main body portion is mounted to the first boss along the second inclined surface.

It can be seen that, in the axial direction of the first through hole, the second boss is farther away from the body than the first boss, and when the end cover is assembled with the adapter in the shell, the main body part can be extruded towards one side where the body is located along the second inclined plane, so that the installation process is simple and convenient.

In one possible embodiment, a surface of the main body portion remote from the adapter is concavely formed with a groove surrounding the second through hole.

It can be seen that, in the axial direction of the second through hole, the bottom surface of the groove (the upper surface of the main body portion recessed is the bottom surface of the groove) is lower than the upper surface of the main body portion away from the adapter, and the groove is provided in the circumferential direction of the second through hole. If the main body part is not provided with a groove, the welding slag generated after welding in the welding area is raised to cause uneven upper surface of the main body part, and when the electric connecting piece (such as aluminum bar) is abutted against the upper surface of the main body part, a gap exists between the electric connecting piece and the upper surface of the main body part, so that the connection stability of the electric connecting piece and the end cover is affected. In the application, after welding the welding area, the welding slag protrusion formed between the welding area and the bottom surface of the groove can be accommodated in the groove, and even if the height of the welding slag protrusion is higher than that of the upper surface of the main body part, the welding slag protrusion can be further processed to ensure that the welding slag protrusion is lower than that of the upper surface of the main body part, so that the upper surface of the main body part is a flat surface, and the connection stability of the end cover and the electric connecting piece is ensured when the end cover and the electric connecting piece are welded.

In one possible embodiment, the welding area has a first face, the first face is a surface of the welding area facing away from the body, the first face is provided with a blocking portion surrounding the first through hole, and the height of the blocking portion is smaller than or equal to the depth of the groove along the axial direction of the first through hole.

It can be seen that the height of the blocking portion is set to be less than or equal to the depth of the groove, so that the groove can accommodate welding slag protrusions formed after the laser beam of the blocking portion is melted, the upper surface of the end cover is a flat surface, and the connection stability of the electric connecting piece and the end cover is further guaranteed.

In a second aspect, an embodiment of the present application provides an electrical device. The powered device comprises an energy storage device as described in the first aspect, which supplies power to the powered device.

In the electric equipment, the connecting part of the adapter is provided with the welding area, and the welding area is arranged around the first through hole. When the adapter and the end cover are assembled, the outer peripheral surface of the welding area is attached to the peripheral surface of the second through hole in the end cover. When the sealing member is assembled at the connecting portion and seals the first through hole, the welding treatment can be carried out at the welding area when the switching member, the end cover and the sealing member are welded, and the welding area and at least part of the sealing member can be filled at the two sides of the welding area along the radial direction of the first through hole, so that the switching member, the end cover and the sealing member can be welded together at one time, and the welding times in the process of assembling the energy storage device can be reduced and the production efficiency is improved relative to the welding between the switching member and the end cover and between the switching member and the sealing member. In addition, the adapter, the end cover and the sealing piece are fixedly connected only through one-time welding, so that the phenomenon that welding slag falls into the electrode assembly to cause short circuit due to repeated welding process is avoided, and the performance of the energy storage device is ensured.

In a third aspect, an embodiment of the present application provides a method for manufacturing an energy storage device according to the first aspect. The energy storage device comprises a shell, an electrode assembly, a switching piece, an end cover and a sealing piece, wherein the shell is provided with an opening, the switching piece comprises a body, a connecting part and a first through hole, the body comprises a first surface and a second surface which are oppositely arranged along the axial direction of the first through hole, the connecting part is arranged on the first surface, the first through hole penetrates through the body and the connecting part, the connecting part is provided with a welding area, the welding area surrounds the first through hole, the end cover is provided with a second through hole, and the manufacturing method of the energy storage device comprises the following steps: and welding the electrode assembly to the second surface. The electrode assembly and the adapter are mounted in the case. And covering the end cover on the opening of the shell, wherein the edge of the end cover is abutted with the edge of the opening of the shell, the connecting part penetrates through the second through hole, at least part of the welding area is exposed out of the end cover, and the outer peripheral surface of the welding area is abutted with the peripheral surface of the second through hole. Welding is performed at the abutment between the edge of the end cap and the housing. And installing the sealing element on the connecting part and sealing the first through hole, wherein the sealing element is connected with the welding area. And welding in the welding area to fixedly connect the sealing piece, the connecting part and the end cover.

In the manufacturing method of the energy storage device, the connecting part of the adapter is provided with the welding area, and the welding area is arranged around the first through hole. When the adapter and the end cover are assembled, the outer peripheral surface of the welding area is attached to the peripheral surface of the second through hole in the end cover. When the sealing element is assembled at the connecting part and seals the first through hole, the sealing element is connected with the welding area, and when the adapter, the end cover and the sealing element are welded, welding treatment can be carried out at the welding area, and the welding area can be filled with molten welding area and at least part of the sealing element along the two radial sides of the first through hole, so that the adapter, the end cover and the sealing element can be welded together at one time, and the welding times in the process of assembling the energy storage device can be reduced relative to the welding between the adapter and the end cover and between the adapter and the sealing element respectively, and the production efficiency is improved. In addition, the adapter, the end cover and the sealing piece are fixedly connected only through one-time welding, so that the phenomenon that welding slag falls into the electrode assembly to cause short circuit due to repeated welding process is avoided, and the performance of the energy storage device is ensured.

In one possible embodiment, the welding zone has a first face, which is the surface of the welding zone facing away from the body, which is provided with a barrier surrounding the first through hole; the welding is performed at the welding area to fixedly connect the sealing member, the connecting portion, and the end cover, including:

and carrying out melting treatment on the blocking part, and filling the melted blocking part on two opposite sides of the welding area along the radial direction of the first through hole so as to fixedly connect the sealing piece, the connecting part and the end cover.

It can be seen that the blocking part of the annular structure is arranged on the first surface of the welding area, and when laser equipment is adopted to perform laser welding towards the welding area, laser beams can diffuse-reflect on the blocking part and the first surface, so that the absorption rate of laser energy is improved, the welding cost is reduced, and the production efficiency is improved. In addition, because the blocking part is higher than the first surface, when the laser welding is carried out, the welding area can be filled with the blocking part after melting along the radial opposite sides of the second through hole, and the end cover, the adapter and the sealing element are welded at one time, so that the connection strength is improved.

In one possible embodiment, a longitudinal section of the blocking portion parallel to the axial direction of the first through hole includes a trapezoid-like shape, and an outer peripheral surface of the blocking portion is a cambered surface concave toward the center of the first through hole; the melt processing of the barrier includes:

and irradiating laser beams to the cambered surface of the blocking part, and carrying out melting treatment on the blocking part.

It can be seen that when the longitudinal section of the blocking portion parallel to the axial direction of the first through hole is trapezoid-like, the blocking portion is of a ring-like trapezoid-like structure, the outer circumferential surface of the blocking portion is an arc surface, specifically, the outer circumferential surface of the blocking portion is an arc surface concave inwards towards the center of the first through hole, and when the laser beam is obliquely incident towards the arc surface of the blocking portion, the laser beam can be prevented from being directly reflected to the blocking portion or the first surface; meanwhile, the cambered surface of the blocking part has the function of collecting the light beams, so that the laser light beams reflected to the cambered surface of the blocking part can be collected, and the absorptivity of the laser light beams is further improved; in addition, after the blocking part with the trapezoid-like structure is subjected to melting treatment by the laser beam, gaps on the inner side and the outer side of the welding area are filled with the liquid blocking part, and the connection strength of the end cover, the adapter and the sealing element is further improved.

In one possible embodiment, the blocking portion includes a plurality of first sections, the plurality of first sections being disposed on the first face in a radial arrangement of the first through holes, each of the first sections surrounding the first through hole, the first sections tapering away from the first face; the melt processing of the barrier includes:

And carrying out melting treatment on the first subsection, wherein the melted first subsection fills the two opposite sides of the welding area along the radial direction of the first through hole so as to fixedly connect the sealing piece, the connecting part and the end cover.

Drawings

In order to more clearly illustrate the technical solution of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described.

Fig. 1 is a schematic view of a scenario of an energy storage device according to an embodiment of the present application;

Fig. 2 is a schematic perspective view of an energy storage device according to an embodiment of the present application;

Fig. 3 is a schematic perspective exploded view of an energy storage device according to an embodiment of the present application;

FIG. 4 is a schematic partial cross-sectional view of the energy storage device shown in FIG. 2 along line IV-IV;

fig. 5 is a schematic perspective view of an adaptor in an energy storage device according to an embodiment of the present application;

FIG. 6 is an enlarged schematic view of a portion VI of the energy storage device of FIG. 4;

Fig. 7 is a schematic perspective view of an end cover in an energy storage device according to an embodiment of the present application;

FIG. 8 is a schematic cross-sectional view of a blocking portion of an energy storage device according to an embodiment of the present application;

FIG. 9 is an enlarged schematic view of the energy storage device shown in FIG. 8 at IX;

FIG. 10 is a schematic cross-sectional view of another blocking portion of an energy storage device according to an embodiment of the present application;

FIG. 11 is an enlarged schematic view of the energy storage device XI shown in FIG. 10;

Fig. 12 is a flowchart of a method for manufacturing an energy storage device according to an embodiment of the present application.

Reference numerals:

the energy storage device 100, the case 10, the opening 11, the electrode assembly 20, the adapter 30, the body 31, the first through hole 311, the tab welding site 312, the first surface 313, the second surface 314, the through hole 315, the connection portion 32, the first boss 321, the second boss 322, the second inclined surface 3221, the welding area 35, the mounting hole 351, the first inclined surface 352, the first surface 353, the blocking portion 37, the first subsection 371, the cambered surface 373, the end cap 50, the second through hole 51, the main body portion 53, the groove 531, the bottom surface 5311, the upper surface 533, the protrusion 55, the explosion-proof valve 60, and the seal 70.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, based on the embodiments of the application, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the application.

The following description of the embodiments refers to the accompanying drawings, which illustrate specific embodiments in which the application may be practiced. Directional terms, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "side", etc., are used herein with reference to the attached drawings only, and thus are used for better, more clear description and understanding of the present application, rather than to indicate or imply that the device or element being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.

Furthermore, the numbering of the components itself, e.g., "first," "second," etc., herein is merely used to distinguish between the described objects and does not have any sequential or technical meaning. The term "coupled" as used herein includes both direct and indirect coupling (coupling), unless otherwise indicated.

Because of the strong timeliness and space properties of energy required by people, in order to reasonably utilize the energy and improve the utilization rate of the energy, one energy form needs to be stored by one medium or equipment and then converted into another energy form, and the energy is released in a specific energy form based on future application. As is well known, to achieve the great goal of carbon neutralization, the main approach to green electric energy generation is to develop green energy sources such as photovoltaic, wind power and the like to replace fossil energy sources. At present, the generation of green electric energy generally depends on photovoltaic, wind power, water potential and the like, but wind energy, solar energy and the like generally have the problems of strong intermittence and large fluctuation, which can cause unstable power grid, insufficient peak electricity consumption, too much electricity consumption and unstable voltage can cause damage to the electric power, so that the problem of 'wind abandoning and light abandoning' possibly occurs due to insufficient electricity consumption requirement or insufficient power grid acceptance, and the problem needs to be solved by relying on energy storage. The energy is converted into other forms of energy through physical or chemical means and is stored, the energy is converted into electric energy when needed and released, in short, the energy storage is similar to a large-scale 'charge pal', the electric energy is stored when the photovoltaic and wind energy are sufficient, and the stored electric power is released when needed.

Taking electrochemical energy storage as an example, the present solution provides an energy storage device 100, in which a chemical battery is disposed in the energy storage device 100, and chemical elements in the chemical battery are mainly used as an energy storage medium, and a charging and discharging process is accompanied with chemical reaction or change of the energy storage medium.

The present energy storage (i.e. energy storage) has a wide application scenario, including aspects of power generation side energy storage, grid side energy storage, renewable energy grid-connected energy storage, user side energy storage, and the like, and the types of the corresponding energy storage device 100 include:

(1) The large energy storage container applied to the energy storage scene at the power grid side can be used as a high-quality active and reactive power regulation power supply in the power grid, so that the load matching of electric energy in time and space is realized, the renewable energy consumption capability is enhanced, and the large energy storage container has great significance in the aspects of standby of a power grid system, relieving peak load power supply pressure and peak regulation and frequency modulation;

(2) The main operation modes of the small and medium-sized energy storage electric cabinet applied to the industrial and commercial energy storage scenes (banks, shops and the like) at the user side and the household small-sized energy storage box applied to the household energy storage scene at the user side are peak clipping and valley filling. Because of the large price difference of the electricity charge at the peak-valley position according to the electricity consumption requirement, after the energy storage equipment is arranged by a user, in order to reduce the cost, the energy storage cabinet/box is charged usually in the electricity price valley period; and in the peak period of electricity price, the electricity in the energy storage equipment is released for use, so that the purpose of saving electricity charge is achieved. In addition, in remote areas and areas with high occurrence of natural disasters such as earthquake, hurricane and the like, the household energy storage device is equivalent to the fact that a user provides a standby power supply for the user and the power grid, and inconvenience caused by frequent power failure due to disasters or other reasons is avoided.

In the embodiment of the present application, a household energy storage scene in user side energy storage is taken as an example for illustration, fig. 1 is a schematic view of a scene of an energy storage device 100 provided in an embodiment of the present application, and the energy storage device 100 is not limited to the household energy storage scene.

As shown in fig. 1, the present application provides a household energy storage system, which includes an electric energy conversion device (photovoltaic panel) 200, a user load (street lamp 300 a), a user load (household appliance 300 b), and the like, and an energy storage device 100, wherein the energy storage device 100 is a small-sized energy storage box and can be installed on an outdoor wall through a wall-hanging manner. In particular, the photovoltaic panel 200 may convert solar energy into electric energy during a low electricity price period, and the energy storage device 100 is used to store the electric energy and supply the electric energy to the electric devices such as the street lamp 300a and the household appliance 300b for use during a high electricity price period, or supply power during a power failure/power outage of the power grid.

It is understood that the energy storage device 100 may include, but is not limited to, a battery cell, a battery module, a battery pack, a battery system, etc. When the energy storage device 100 is a single battery, it may be a circular battery.

Referring to fig. 2, 3 and 4, an energy storage device 100 is provided in an embodiment of the present application, and the energy storage device 100 includes a housing 10, an electrode assembly 20, an adapter 30, an end cap 50 and a sealing member 70. The housing 10 has an opening 11. The electrode assembly 20 is accommodated in the case 10. The adapter 30 is mounted in the housing 10, and the adapter 30 includes a body 31, a connection portion 32, and a first through hole 311. The body 31 includes a first surface 313 and a second surface 314 disposed opposite to each other in the axial direction of the first through hole 311. The connection portion 32 is disposed on the first surface 313, and the second surface 314 is electrically connected to the electrode assembly 20. The first through hole 311 penetrates the body 31 and the connection portion 32, and the connection portion 32 is provided with a land 35, and the land 35 surrounds the first through hole 311. The end cap 50 is covered on the opening 11 of the housing 10, and the edge of the end cap 50 abuts against the edge of the opening 11 of the housing 10. The end cap 50 is formed with a second through hole 51, the connection portion 32 is inserted through the second through hole 51, at least a portion of the land 35 is exposed to the second through hole 51, and the outer peripheral surface of the land 35 is bonded to the peripheral wall of the second through hole 51. The sealing member 70 is mounted to the connection portion 32 and seals the first through hole 311, the sealing member 70 is connected to the welding area 35, and welding is performed at the welding area 35 to fixedly connect the sealing member 70, the connection portion 32 and the end cap 50.

In the energy storage device 100 of the present application, the connection portion 32 of the adaptor 30 is provided with the welding area 35, and the welding area 35 is disposed around the first through hole 311. When the adaptor 30 and the end cap 50 are assembled, the outer peripheral surface of the welding area 35 is attached to the peripheral surface of the end cap 50 where the second through hole 51 is formed (i.e., the peripheral surface of the end cap 50 surrounding the second through hole 51). When the sealing member 70 is assembled at the connecting portion 32 and seals the first through hole 311, the sealing member 70 is connected with the welding area 35, and when the adaptor 30, the end cover 50 and the sealing member 70 are welded, the welding treatment can be performed at the welding area 35, and both sides of the welding area 35 along the radial direction of the first through hole 311 can be filled with the melted welding 35 and at least part of the melted sealing member 70, so that the adaptor 30, the end cover 50 and the sealing member 70 can be welded together at one time, and compared with the welding between the adaptor 30 and the end cover 50 and the welding between the adaptor 30 and the sealing member 70 respectively, the welding times in the process of assembling the energy storage device 100 can be reduced, and the production efficiency is improved. In addition, the adaptor 30, the end cover 50 and the sealing member 70 are fixedly connected by welding only once, so that short circuit caused by welding slag falling into the electrode assembly due to multiple welding processes is avoided, and the performance of the energy storage device 100 is ensured.

It will be appreciated that at least a portion of the land 35 is exposed outside the second through hole 51, and that the upper surface of the land 35 may be lower than the second through hole 51, or the upper surface of the land 35 may be flush with the upper surface of the cap 50 around the second through hole 51.

Illustratively, the outer peripheral surface of the seal 70 is in contact with the inner peripheral surface of the weld zone 35.

When the sealing member 70 is assembled at the connecting portion 32 and seals the first through hole 311, that is, the sealing member 70 is embedded in a space surrounded by the inner peripheral surface of the welding region 35, and the sealing member 70 is welded to the welding region 35, at least a portion of the welding region 35 is exposed out of the second through hole 51, the welding region 35 can provide a stable and exposed and visualized welding position, and the welding condition among the end cover 50, the adapter member 30 and the sealing member 70 is visually visible, so that the condition of cold welding or miswelding is avoided, and the production efficiency can be further improved.

Illustratively, the weld zone 35 has a first face 353, the first face 353 being the surface of the weld zone 35 facing away from the body 31, the seal 70 abutting the first face 353.

When the seal member 70 is assembled to the end cap 50 and the adapter member 30, the bottom surface of the seal member 70 (i.e., the surface of the seal member 70 close to the body 31) may be abutted against the first surface 353, and when the welding area 35 is welded, the molten at least part of the seal member 70 and the molten welding area 35 will fill the gap between the outer peripheral surface of the welding area 35 and the peripheral surface of the second through hole 51, the bottom surface of the seal member 70 is abutted against the first surface 353 of the welding area 35, and the molten at least part of the seal member 70 and the molten welding area 35 realize the connection of the seal member 70 and the adapter member 30, i.e., the seal member 70, the adapter member 30 and the end cap 50 are connected two by one welding, so that the number of welding times is reduced and the production efficiency is improved.

Illustratively, the first face 353 is lower than the upper surface 533 of the end cap 50 facing away from the adapter 30 in the axial direction of the first throughbore 311. The outer peripheral surface of the seal 70 is bonded to the peripheral surface of the second through hole 51.

It will be appreciated that, along the axial direction of the first through hole 311, the first surface 353 is lower than the upper surface 533 of the end cap 50, such that an accommodating space is formed between the first surface 353 and the peripheral surface of the second through hole 51, and the seal member 70 may be accommodated in the accommodating space, at this time, the peripheral surface of the seal member 70 is attached to the peripheral surface of the second through hole 51, for example, along the axial direction of the first through hole 311, the surface of the seal member 70 facing away from the body 31 may be flush with the upper surface 533 of the end cap 50, or the surface of the seal member 70 facing away from the body 31 may be lower than the upper surface of the end cap 50, wherein the surface of the seal member 70 facing away from the body 31 may be a flat surface. In this way, when the welding area 35 is used for welding, the molten part of the welding area 35 fills the gap between the outer peripheral surface of the welding area 35 and the peripheral surface of the second through hole 51, the sealing element 70 is abutted against the first surface 353, and after the welding is completed, the surface of the sealing element 70, which is away from the body 31, is lower than the upper surface 533 of the end cover 50, so that the surface of the sealing element 70, which is away from the body 31, is prevented from interfering with the installation of the electric connector (such as aluminum bar); and when the welding area 35 is welded, at one side of the welding area 35 away from the body 31, the melted welding area 35 is not easy to exceed the gap between the outer peripheral surface of the sealing element 70 and the peripheral surface of the second through hole 51, and the welding slag generated after the welding of the welding area 35 is not exposed on the upper surface 533 of the end cover 50, so that the upper surface 533 of the end cover 50 is ensured to be a flat surface, and the connection stability of the electric connecting element and the end cover 50 is ensured.

It can be appreciated that the electrode assembly 20 is mounted in the case 10 when the adapter 30 is mounted to the case 10; or after the electrode assembly 20 is welded to the adapter 30, the adapter 30 is mounted in the case 10 together with the electrode assembly 20, which is not limited in the present application. The adapter 30, the end cap 50 and the seal 70 are all made of metal. For example, both the end cap 50 and the seal 70 may be made of metallic aluminum.

It is understood that the first through hole 311 and the second through hole 51 are circular holes, and the first through hole 311 and the second through hole 51 are coaxially disposed. In other embodiments, the shapes of the first through hole 311 and the second through hole 51 may be rectangular, elliptical, triangular, or the like.

Referring to fig. 5, the electrode assembly is formed with tabs, and the body 31 of the adapter 30 is welded with the tabs, specifically, one side of the body 31 facing away from the connection portion 32 is welded with the tabs, thereby electrically connecting the electrode assembly 20 with the adapter 30. In the present application, a tab welding position 312 is formed on a surface of the body 31 facing away from the connection portion 32, the tab connection position is a protrusion, and the tab connection position protrudes from the first surface 313 toward the second surface 314, so that after the tab connection position is welded with the tab of the electrode assembly 20, a gap exists between the electrode assembly 20 and the second surface 314 where the tab welding position 312 is not provided, and gas generated by internal circulation of the energy storage device 100 can be discharged out of the casing 10 from the gap between the electrode assembly 20 and the second surface 314 where the tab welding position 312 is not provided.

Illustratively, the tab connection extends from the connection portion 32 to the edge of the body 31 in the radial direction of the first through hole 311; the number of the tab connection positions is multiple, the tab welding positions 312 are uniformly arranged at intervals in the circumferential direction of the body 31, the tab welding positions 312 can increase the connection area with the tab, and the overcurrent capacity of the adapter 30 is enhanced.

For example, the body 31 may further be provided with a plurality of through holes 315, where the plurality of through holes 315 are located and the position where the tab welding positions 312 are located are staggered, so that the through holes 315 are avoided being provided on the tab welding positions 312, and the contact area between the tab and the adaptor 30 is ensured. The through holes 315 are used for circulating the gas generated by the internal circulation of the energy storage device 100, and the gas generated by the internal circulation of the energy storage device 100 can be discharged out of the housing 10 through the through holes 315 and the explosion-proof valve 60 on the end cover 50.

Referring to fig. 5 and 6, further, the connecting portion 32 includes a first boss 321 and a second boss 322, the first boss 321 is connected with the body 31, the second boss 322 is disposed on a surface of the first boss 321 facing away from the body 31, the first boss 321 is disposed between the body 31 and the second boss 322 along an axial direction of the first through hole 311, and the first through hole 311 penetrates through the body 31, the first boss 321 and the second boss 322.

Illustratively, the first boss 321 and the second boss 322 are each cylindrical structures having a through hole (specifically, the first through hole 311) in the center. The welding area 35 is arranged on one surface of the second boss 322, which is away from the first boss 321, and the outer peripheral surface of the second boss 322 and the outer peripheral surface of the welding area 35 are attached to the peripheral surface of the second through hole 51.

Along the axial direction of the first through hole 311, the body 31 is sequentially provided with a first boss 321, a second boss 322 and a welding area 35, the first through hole 311 penetrates through the body 31, the first boss 321 and the second boss 322, and the welding area 35 surrounds the first through hole 311, so that when the electrolyte injection (electrolyte injection) process is performed, the electrolyte can be injected into the electrode assembly 20 in the casing 10 through the first through hole 311. The first boss 321 and the second boss 322 are arranged, so that a certain interval exists between the end cover 50 and the body 31, and gas generated by the circulation of the energy storage device 100 can be led to the explosion-proof valve 60 through the interval between the end cover 50 and the body 31, so that the effect of pressure relief of exhaust is improved.

The outer peripheral surface of the welding area 35 is attached to the peripheral surface of the second through hole 51, and the outer peripheral surface of the second boss 322 is attached to the peripheral surface of the second through hole 51, so that part of welding slag generated by welding in the welding area 35 can accumulate at the gap between the second boss 322 and the peripheral surface of the second through hole 51, the welding slag of the welding area 35 is prevented from directly falling onto the electrode assembly, and the performance of the energy storage device 100 is ensured. In the present application, the size of the first boss 321 is greater than the size of the second boss 322 in the radial direction of the first through hole 311, so that the welding slag generated in the welding region 35 can be accumulated on the first boss 321, and the welding slag is prevented from falling directly onto the electrode assembly.

Referring to fig. 7, further, the end cap 50 includes a main body 53 and a protrusion 55, wherein the protrusion 55 extends from an end of an outer peripheral surface of the main body 53 away from the adapter 30 in a radial direction of the first through hole 311, the main body 53 abuts against the connection portion 32, and the protrusion 55 abuts against the housing 10.

The second boss 322 is disposed on a surface of the first boss 321 facing away from the body 31, specifically, the second boss 322 is disposed on the surface of the first boss 321 near the inner periphery of the first through hole 311, and the outer periphery of the surface of the first boss 321 is used for supporting the main body 53 of the end cover 50.

When the end cap 50 is covered on the case 10, the protrusion 55 is abutted on the case 10, and the abutment between the protrusion 55 and the case 10 is welded, thereby realizing seal welding between the end cap 50 and the case 10. The main body 53 is abutted against the first boss 321, so that the contact area between the adaptor 30 and the end cover 50 can be increased, and the overcurrent capacity of the adaptor 30 can be increased; and the main body 53 is abutted on the first boss 321, along the axial direction of the first through hole 311, so that a certain interval exists between the end cover 50 and the body 31 of the adaptor 30, and the gas generated by the circulation of the energy storage device 100 can sequentially pass through the through hole 315 on the body 31 and the interval between the end cover 50 and the body 31 to the explosion-proof valve 60, thereby improving the effect of exhausting and reducing pressure. In addition, the body portion 53 is abutted against the first boss 321, and the welding slag generated when the welding is performed in the welding zone 35 can be further prevented from falling into the electrode assembly 20.

Referring to fig. 3 and 6, further, a surface of the main body 53 away from the adapter 30 is concavely formed with a groove 531, and the groove 531 surrounds the second through hole 51. In the axial direction of the second through hole 51, the bottom surface 5311 of the groove 531 (the upper surface 533 of the main body portion 53 recessed down is the bottom surface 5311 of the groove 531) is lower than the upper surface 533 of the main body portion 53 remote from the adapter 30, and the groove 531 is provided in the circumferential direction of the second through hole 51. If the main body 53 is not provided with the groove 531, the welding slag generated after welding the welding area 35 is raised to cause the upper surface 533 of the main body 53 to be uneven, and when the electric connector (such as aluminum bar) is abutted against the upper surface 533 of the main body 53, a gap exists between the electric connector and the upper surface 533 of the main body 53, so that the connection stability of the electric connector and the end cover 50 is affected. In the present application, after welding the welding area 35, the welding slag protrusion formed between the welding area 35 and the bottom surface 5311 of the groove 531 may be accommodated in the groove 531, and even if the height of the welding slag protrusion is higher than the upper surface 533 of the main body 53, the welding slag protrusion may be further processed such that the welding slag protrusion is lower than the upper surface 533 of the main body 53, thereby ensuring that the upper surface 533 of the main body 53 is a flat surface and ensuring the stability of the connection between the end cap 50 and the electrical connector when the end cap 50 is welded with the electrical connector.

It will be appreciated that when the main body portion 53 is formed with the groove 531, the first face 353 of the land 35 is lower than the bottom face 5311 of the groove 531 in the axial direction of the first through hole 311.

It will be appreciated that when the seal 70 abuts against the first face 353, and the outer peripheral surface of the seal 70 is in engagement with the peripheral surface of the second through hole 51, the surface of the seal 70 facing away from the body 31 may be flush with the bottom surface 5311 of the groove 531, or the surface of the seal 70 facing away from the body 31 may be lower than the bottom surface 5311 of the groove 531.

The welding area 35 is disposed around the first through hole 311, and the welding area 35 is a circular ring, specifically, a circular ring structure disposed on a surface of the second boss 322 facing away from the first boss 321, specifically, the welding area 35 is disposed at a periphery of the surface of the second boss 322, and a portion of the surface of the second boss 322 where the welding area 35 is not disposed may be used to support the sealing member 70. The width W of the land 35 is 800 micrometers or more and 1800 micrometers or less in the radial direction of the first through hole 311. The width W of the bonding area 35 is the distance that the bonding area 35 of the circular ring structure extends along the radial direction of the first through hole 311. For example, the width W of the land 35 may be 800 micrometers, 900 micrometers, 1000 micrometers, 1090 micrometers, 1130 micrometers, 1200 micrometers, 1400 micrometers, 1530 micrometers, 1650 micrometers, or 1800 micrometers, and the width W of the land 35 may be any value of 800 micrometers or more and 1800 micrometers or less, which is not exemplified herein.

If the width W of the welding area 35 is less than 800 μm, the area of the welding area 35 is too small, and when the welding area 35 welds the end cap 50, the adapter 30 and the seal 70 together, the welding area 35 is too small, resulting in too weak connection strength between the end cap 50, the adapter 30 and the seal 70, and when the pressure inside the energy storage device 100 increases, the seal 70 easily drops from the connection portion 32, and the sealability of the energy storage device 100 is poor after welding. If the width W of the welding area 35 is greater than 1800 μm, the area of the welding area 35 is too large, and when the welding area 35 is welded, the area required to be welded is too large, which increases the welding time, resulting in a decrease in production efficiency. The width W of the welding area 35 is set to be greater than or equal to 800 micrometers and less than or equal to 1800 micrometers, so that the welding area of the welding area 35 is ensured to be within a proper range, the connection strength among the end cover 50, the adapter 30 and the sealing member 70 is ensured, the energy storage device 100 after welding is ensured to have better tightness, the end cover 50, the adapter 30 and the sealing member 70 are ensured to be subjected to one-step welding forming, the welding time increase caused by the overlarge area of the welding area 35 is avoided, and the welding efficiency and the production efficiency of the energy storage device 100 are further improved.

Further, in the axial direction of the first through hole 311, the height H1 of the land 35 is 600 micrometers or more and 1200 micrometers or less. The height H1 of the land 35 may be 600 microns, 630 microns, 700 microns, 760 microns, 820 microns, 900 microns, 1000 microns, 1060 microns, 1100 microns, 1200 microns, or the like, and the height H1 of the land 35 may be any value not less than 600 microns and not more than 1200 microns, which is not specifically shown herein.

If the height H1 of the welding area is less than 600 micrometers, the welding depth of the welding area 35 is small when the end cap 50, the adapter 30 and the seal 70 are welded together, resulting in weak connection strength among the end cap 50, the adapter 30 and the seal 70, and when the pressure inside the energy storage device 100 increases, the seal 70 easily drops from the connection portion 32, and the sealability of the energy storage device 100 after welding is poor. If the height H1 of the land 35 is greater than 1200 micrometers, the thickness of the land 35 to be welded is thicker, and the welding time period is increased. The height H1 of the welding area 35 is set to be greater than or equal to 600 micrometers and less than or equal to 1200 micrometers, so that the welding thickness of the welding area 35 is ensured to be within a proper range, the connection strength among the end cover 50, the adapter 30 and the sealing element 70 is ensured, the energy storage device 100 after welding is ensured to have better tightness, the end cover 50, the adapter 30 and the sealing element 70 can be welded and formed at one time, the welding time increase caused by overlarge height of the welding area 35 is avoided, and the welding efficiency and the production efficiency of the energy storage device 100 are further improved.

Referring to fig. 5 and 6, further, the inner circumferential surface of the welding area 35 is surrounded with a mounting hole 351, the mounting hole 351 communicates with the first through hole 311, the mounting hole 351 has a diameter larger than that of the first through hole 311, and the sealing member 70 is mounted to the mounting hole 351 and seals the first through hole 311.

Specifically, since the welding area 35 has a circular ring structure, the welding area 35 encloses the mounting hole 351, the size of the mounting hole 351 is adapted to the size of the sealing member 70, and when the sealing member 70 is mounted in the mounting hole 351, the outer peripheral surface of the sealing member 70 is attached to the inner peripheral surface of the welding area 35, so that when the adaptor 30 and the sealing member 70 are welded, a laser device can be used to weld along the welding area 35 in one turn.

In the case where the electrode assembly 20, the adapter 30 and the end cap 50 are all mounted on the case 10, along the axial direction of the first through hole 311, the first through hole 311 is further provided with a mounting hole 351 on one side away from the electrode assembly 20, and when the seal member 70 is mounted in the mounting hole 351, the seal member 70 can abut against the surface (specifically, the inner periphery of the surface) of the second boss 322, which faces away from the first boss 321, and the outer periphery of the seal member 70 is attached to the inner periphery of the welding zone 35, so that the contact area between the adapter 30 and the seal member 70 can be further increased, and the overcurrent capacity of the adapter 30 can be enhanced; the diameter of the mounting hole 351 is larger than that of the first through hole 311, so that the seal 70 can be prevented from sliding down from the mounting hole 351 into the first through hole 311, and the seal 70 can completely block and seal the first through hole 311.

Further, the inner circumferential surface of the welding zone 35 has a first inclined surface 352, and the seal 70 is mounted to the mounting hole 351 along the first inclined surface 352. A portion of the inner circumferential surface of the welding area 35 (e.g., an end of the inner circumferential surface remote from the second boss 322) may be provided as the first inclined surface 352, or the inner circumferential surface of the welding area 35 may be integrally provided as the first inclined surface 352, and when the sealing member 70 is assembled, the sealing member 70 may be installed in the installation hole 351 by pressing down along the first inclined surface 352, and the assembly of the sealing member 70 may be more convenient.

Referring to fig. 3 and 6, further, the bonding area 35 has a first surface 353, the first surface 353 is a surface of the bonding area facing away from the body 31, and a roughness of the first surface 353 is greater than or equal to 1.6Ra and less than or equal to 3.2Ra. The first surface 353 is a surface of the welding area 35 exposed to the second through hole 51 (the first surface 353 may be flush with an upper surface of the end cap 50 around the second through hole 51 or may be higher than an upper surface of the end cap 50 around the second through hole 51), and the roughness of the first surface 353 is limited to be 1.6Ra or more and 3.2Ra or less, so that the first surface 353 is rough, when the welding area 35 is subjected to laser welding, the smooth first surface 353 is prevented from reflecting, and further, the welding temperature is prevented from not reaching a preset value to form a cold joint, and meanwhile, the damage of the laser device lens caused by the light beam reflected by the first surface 353 and the blue explosion phenomenon at the welding area 35 are avoided.

Referring to fig. 8 and 9, further, the adaptor 30 further includes a blocking portion 37, where the blocking portion 37 is disposed on the first surface 353 and surrounds the first through hole 311. The blocking part 37 with the annular structure is arranged on the first surface 353 of the welding area 35, when laser equipment is adopted to perform laser welding towards the welding area 35, laser beams can diffuse-reflect on the blocking part 37 and the first surface 353, so that the absorption rate of laser energy is further improved, the welding cost is reduced, and the production efficiency is improved.

Illustratively, the blocking portion 37 includes a plurality of first segments 371, the plurality of first segments 371 being disposed on the first face 353 in a radial arrangement of the first through holes 311, each of the first segments 371 surrounding the first through holes 311, the first segments 371 tapering away from the first face 353.

When the longitudinal section of the first subsection 371 parallel to the axial direction of the first through hole 311 is triangular, the first subsection 371 has a ring-shaped triangular prism structure, and the plurality of first subsections 371 are arranged on the first surface 353 in the radial direction of the first through hole 311, i.e. the plurality of first subsections 371 are concentric rings; in the radial direction of the first through hole 311, there may be a space between two adjacent first sections 371, or they may abut against each other. So, on first face 353, a plurality of first subdivisions 371 are the ripple structure, when welding area 35 carries out laser welding, a plurality of first subdivisions 371 can carry out diffuse reflection with laser beam at the surface and the first face 353 of a plurality of first subdivisions 371, further promotes the absorptivity of laser energy, reduces welding cost, promotes production efficiency. Meanwhile, the plurality of first subsections 371 with triangular longitudinal sections are melted after absorbing laser beams and fill gaps between the two first subsections 371, so that welding marks caused by insufficient welding materials in the welding area 35 are avoided, the structural strength is reduced, and the safety performance of the energy storage device 100 is improved.

Referring to fig. 10 and 11, illustratively, a longitudinal section of the blocking portion 37 parallel to the axial direction of the first through hole 311 includes a trapezoid-like shape, and an outer peripheral surface of the blocking portion 37 is a cambered surface 373 that is concave inward toward the center of the first through hole 311.

When the longitudinal section of the blocking portion 37 parallel to the axial direction of the first through hole 311 is trapezoid-like, the blocking portion 37 is of a ring-like trapezoid-like structure, the outer circumferential surface of the blocking portion 37 is an arc surface 373, specifically, the outer circumferential surface of the blocking portion 37 is an arc surface 373 concave inwards towards the center of the first through hole 311, when the laser beam is obliquely incident towards the arc surface 373 of the blocking portion 37, the laser beam can be prevented from being directly reflected to the blocking portion 37 or the first surface 353; meanwhile, the cambered surface 373 of the blocking part 37 has the function of collecting the light beams, so that the laser light beams reflected to the cambered surface 373 of the blocking part 37 can be collected, and the absorptivity of the laser light beams is further improved; in addition, when the laser beam irradiates the arc surface 373 of the blocking portion 37, the blocking portion 37 melts into a liquid when heated to reach the melting point, so that the gaps between the inner side and the outer side of the blocking portion 37 can be filled, and the connection strength of the end cover 50, the adapter 30 and the sealing member 70 can be further improved.

Further, in the axial direction of the first through hole 311, the height H2 of the blocking portion 37 is equal to or less than the depth D of the groove 531. In the present application, the height H2 of the blocking portion 37 is set to be less than or equal to the depth D of the groove 531, so that the groove 531 can accommodate the welding slag protrusion formed after the laser beam of the blocking portion 37 is melted, ensuring that the upper surface 533 of the end cover 50 is a flat surface, and further ensuring the connection stability of the electrical connector and the end cover 50.

The outer peripheral surface of the second boss 322 has a second inclined surface 3221, and the main body portion 53 of the end cap 50 is attached to the first boss 321 along the second inclined surface 3221. In the axial direction of the first through hole 311, the second boss 322 is farther from the body 31 than the first boss 321, and when the end cap 50 is assembled with the adapter 30 in the housing 10, the main body 53 can be pressed along the second inclined plane 3221 toward the side where the body 31 is located, so that the installation process is simple.

The application also provides electric equipment, which comprises the energy storage device 100 provided by any embodiment of the application, and the energy storage device 100 supplies power for the electric equipment. The powered device may include, but is not limited to, battery cars, electric toys, electric tools, electric vehicles, boats and ships, spacecraft, cell phones, portable devices, palm top computers, notebook computers, and the like.

In the electric device of the present application, the connection portion 32 of the adapter 30 is provided with the welding area 35, and the welding area 35 is disposed around the first through hole 311. When the adapter 30 and the end cover 50 are assembled, the outer peripheral surface of the welding area 35 is attached to the peripheral surface of the end cover 50 where the second through hole 51 is formed. When the sealing member 70 is assembled at the connecting portion 32 and seals the first through hole 311, the welding treatment can be performed at the welding area 35 when the adaptor 30, the end cover 50 and the sealing member 70 are welded, and both sides of the welding area 35 along the radial direction of the first through hole 311 can be filled with the melted welding 35 and at least part of the melted sealing member 70, so that the adaptor 30, the end cover 50 and the sealing member 70 can be welded together at one time, and compared with the welding times in the process of assembling the energy storage device 100 and the welding between the adaptor 30 and the end cover 50 and between the adaptor 30 and the sealing member 70 respectively, the production efficiency is improved. In addition, the adaptor 30, the end cover 50 and the sealing member 70 are fixedly connected by welding only once, so that short circuit caused by welding slag falling into the electrode assembly due to multiple welding processes is avoided, and the performance of the energy storage device 100 is ensured.

Referring to fig. 6 and 12, the present application further provides a method for manufacturing the energy storage device 100. The method for manufacturing the energy storage device 100 includes:

S1201: electrode assembly 20 is welded to second surface 314.

S1202: the electrode assembly 20 and the adapter 30 are mounted in the case 10.

S1203: the end cap 50 is covered on the opening 11 of the shell 10, the edge of the end cap 50 is abutted against the edge of the opening 11 of the shell 10, the connecting part 32 is penetrated with the second through hole 51, at least part of the welding zone 35 is exposed out of the end cap 50, and the outer peripheral surface of the welding zone 35 is abutted against the peripheral surface of the second through hole 51;

s1204: welding at the abutment between the edge of the end cap 50 and the housing 10;

S1205: mounting the sealing member 70 to the connection portion 32 and sealing the first through hole 311, the sealing member 70 being connected to the land 35;

S1206: welding is performed at the welding area 35 to fixedly connect the sealing member 70, the connection portion 32, and the end cap 50.

It should be noted that, the energy storage device 100 provided by the embodiment of the present application is manufactured by the manufacturing method of the energy storage device 100 provided by the present application.

For example, the manufacturing process of the energy storage device 100 may be:

first, the electrode assembly 20 is welded to the second surface 314 of the body 31, and the welded electrode assembly 20 and the adapter 30 are mounted in the case 10. The main body 53 of the end cap 50 is then closed toward the housing 10 along the second boss 322 of the adapter 30, and the protrusion 55 abuts against the housing 10. The peripheral surface of the second through hole 51 is bonded to the outer peripheral surface of the second boss 322, and the peripheral surface of the second through hole 51 is bonded to the outer peripheral surface of the land 35. Then, seal welding is performed at the contact portion between the projection 55 and the case 10, thereby realizing welding between the case 10 and the end cap 50. Next, the seal 70 is pressed along the inner peripheral surface of the land 35 toward the second boss 322 until the seal 70 abuts against the second boss 322, at which time the outer peripheral surface of the seal 70 abuts against the inner peripheral surface of the land 35, and the bottom of the seal 70 seals the first through hole 311. Finally, laser welding is performed along the welding area 35 by using a laser device, so that the end cover 50, the adapter 30 and the sealing element 70 can be welded together at one time.

Further, before the sealing member 70 is mounted to the connection portion 32 and seals the first through hole 311, the manufacturing method may further include: electrolyte is injected into the case 10 through the first through hole 311.

Illustratively, the end cap 50 may be seal welded to the housing 10 prior to the liquid (electrolyte) injection process; or the liquid injection process is performed first, and then the end cover 50 and the shell 10 are subjected to seal welding.

In the method for manufacturing the energy storage device 100 of the present application, the connecting portion 32 of the adaptor 30 is provided with the welding area 35, and the welding area 35 is disposed around the first through hole 311. When the adapter 30 and the end cover 50 are assembled, the outer peripheral surface of the welding area 35 is attached to the peripheral surface of the end cover 50 where the second through hole 51 is formed. When the sealing member 70 is assembled at the connecting portion 32 and seals the first through hole 311, the sealing member 70 is connected with the welding area 35, and when the adaptor 30, the end cover 50 and the sealing member 70 are welded, the welding treatment can be performed at the welding area 35, and both sides of the welding area 35 along the radial direction of the first through hole 311 can be filled with the melted welding 35 and at least part of the melted sealing member 70, so that the adaptor 30, the end cover 50 and the sealing member 70 can be welded together at one time, and compared with the welding between the adaptor 30 and the end cover 50 and the welding between the adaptor 30 and the sealing member 70 respectively, the welding times in the process of assembling the energy storage device 100 can be reduced, and the production efficiency is improved. In addition, the adaptor 30, the end cover 50 and the sealing member 70 are fixedly connected by welding only once, so that short circuit caused by welding slag falling into the electrode assembly due to multiple welding processes is avoided, and the performance of the energy storage device 100 is ensured.

Referring to fig. 7, for example, the bonding pad 35 has a first face 353, the first face 353 being a surface of the bonding pad 35 facing away from the body 31, the first face 353 being provided with a blocking portion 37 surrounding the first through hole 311; the welding is performed at the welding area 35 to fixedly connect the sealing member 70, the connecting portion 32 and the end cap 50 may be implemented by:

The blocking portion 37 is subjected to a melting process, and the melted blocking portion 37 fills the welding region 35 at opposite sides in the radial direction of the first through hole 311 to fixedly connect the sealing member 70, the connecting portion 32 and the cap 50.

In this embodiment, the blocking portion 37 with an annular structure is disposed on the first surface 353 of the welding area 35, and when the laser device is used to perform laser welding towards the welding area 35, the laser beam can be diffusely reflected on the blocking portion 37 and the first surface 353, so that the absorption rate of laser energy is improved, the welding cost is reduced, and the production efficiency is improved. In addition, since the blocking portion 37 is higher than the first surface 353, the melted blocking portion 37 fills the welding area 35 on two opposite sides in the radial direction of the second through hole 51, and the end cap 50, the adapter 30 and the seal member 70 are welded at one time, thereby improving the connection strength.

Further, referring to fig. 9, a longitudinal section of the blocking portion 37 parallel to the axial direction of the first through hole 311 includes a trapezoid shape, and an outer circumferential surface of the blocking portion 37 is a cambered surface 373 recessed toward the center of the first through hole 311; the method for implementing the melting treatment of the blocking portion 37 may be:

the arc surface 373 of the stopper 37 is irradiated with a laser beam, and the stopper 37 is subjected to a melting process.

In this embodiment, when the longitudinal section of the blocking portion 37 parallel to the axial direction of the first through hole 311 is in a trapezoid-like shape, the blocking portion 37 has a ring-like trapezoid-like structure, and the outer circumferential surface of the blocking portion 37 is an arc surface 373, specifically, the outer circumferential surface of the blocking portion 37 is an arc surface 373 concave inward toward the center of the first through hole 311, when the laser beam is obliquely incident toward the arc surface 373 of the blocking portion 37, the laser beam can be prevented from being directly reflected and reflected to the blocking portion 37 or the first surface 353; meanwhile, the cambered surface 373 of the blocking part 37 has the function of collecting the light beams, so that the laser light beams reflected to the cambered surface 373 of the blocking part 37 can be collected, and the absorptivity of the laser light beams is further improved; in addition, after the blocking portion 37 having a trapezoid-like structure is melted by the laser beam, the liquid blocking portion 37 fills the gaps between the inner side and the outer side of the welding area 35, and the connection strength of the end cap 50, the adapter 30 and the seal member 70 is further improved.

Referring to fig. 8, for example, the blocking portion 37 includes a plurality of first segments 371, wherein the plurality of first segments 371 are disposed on the first surface 353 along a radial direction of the first through hole 311, each of the first segments 371 surrounds the first through hole 311, and the first segments 371 gradually decrease away from the first surface 353; the method for implementing the melting treatment of the blocking portion 37 may be:

The first segment 371 is subjected to a melting process, and the melted first segment 371 fills the welding area on the opposite sides in the radial direction of the first through hole 311 to fixedly connect the sealing member 70, the connection portion 32 and the cap 50.

In the present embodiment, the first sections 371 gradually decrease away from the first surface 353, for example, when the longitudinal section of the first sections 371 parallel to the axial direction of the first through holes 311 is triangular, the first sections 371 have a ring-shaped triangular prism structure, and the plurality of first sections 371 are arranged on the first surface 353 in the radial direction of the first through holes 311, i.e., the plurality of first sections 371 are concentric rings; in the radial direction of the first through hole 311, there may be a space between two adjacent first sections 371, or they may abut against each other. So, on first face 353, a plurality of first subdivisions 371 are the ripple structure, when welding area 35 carries out laser welding, a plurality of first subdivisions 371 can carry out diffuse reflection with laser beam at the surface and the first face 353 of a plurality of first subdivisions 371, further promotes the absorptivity of laser energy, reduces welding cost, promotes production efficiency. Meanwhile, the plurality of first subsections 371 with the triangular longitudinal sections are melted after absorbing laser beams and fill gaps between the two first subsections 371, so that welding marks caused by insufficient welding materials in a welding area 35 are avoided, the structural strength is reduced, and the safety performance of the energy storage device 1000 is improved.

While the foregoing is directed to embodiments of the present application, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the application, and such changes and modifications are intended to be included within the scope of the application.

Claims

1. An energy storage device (100) characterized by comprising a shell (10), an electrode assembly (20), an adapter (30), an end cover (50) and a sealing member (70);

The housing (10) has an opening (11);

the electrode assembly (20) is housed within the case (10);

The adaptor (30) is installed in the shell (10), the adaptor (30) comprises a body (31), a connecting part (32) and a first through hole (311), the body (31) is provided with a first surface (313) and a second surface (314) which are oppositely arranged along the axial direction of the first through hole (311), the connecting part (32) is arranged on the first surface (313), the second surface (314) is electrically connected with the electrode assembly (20), the first through hole (311) penetrates through the body (31) and the connecting part (32), the connecting part (32) is provided with a welding area (35), and the welding area (35) surrounds the first through hole (311);

the end cover (50) is covered on the opening (11) of the shell (10), and the edge of the end cover (50) is abutted with the edge of the opening (11) of the shell (10);

the end cover (50) is provided with a second through hole (51), the connecting part (32) penetrates through the second through hole (51), at least part of the welding area (35) is exposed out of the second through hole (51), and the outer peripheral surface of the welding area (35) is attached to the peripheral surface of the second through hole (51);

The sealing element (70) is installed on the connecting part (32) and seals the first through hole (311), the sealing element (70) is connected with the welding area (35), and welding is carried out on the welding area (35) so as to fixedly connect the sealing element (70), the connecting part (32) and the end cover (50).

2. The energy storage device (100) of claim 1, wherein an outer peripheral surface of the seal (70) conforms to an inner peripheral surface of the weld zone (35).

3. The energy storage device (100) according to claim 1, wherein the weld zone (35) has a first face (353), the first face (353) being a surface of the weld zone (35) facing away from the body (31), the seal (70) abutting the first face (353).

4. The energy storage device (100) of claim 3, wherein the first face (353) is lower than an upper surface of the end cap (50) facing away from the adapter (30) in an axial direction of the first through hole (311); the outer peripheral surface of the seal (70) is bonded to the peripheral surface of the second through hole (51).

5. The energy storage device (100) according to claim 1, wherein the width of the land (35) is 800 micrometers or more and 1800 micrometers or less in the radial direction of the first through hole (311).

6. The energy storage device (100) according to claim 1, wherein the height of the land (35) is 600 micrometers or more and 1200 micrometers or less in the axial direction of the first through hole (311).

7. The energy storage device (100) of claim 1, wherein the weld zone (35) has a first face (353), the first face (353) being a surface of the weld zone (35) facing away from the body (31), the first face (353) having a roughness of 1.6Ra or more and 3.2Ra or less.

8. The energy storage device (100) according to claim 1, wherein the soldering zone (35) has a first face (353), the first face (353) being a surface of the soldering zone (35) facing away from the body (31), the first face (353) being provided with a blocking portion (37) surrounding the first through hole (311).

9. The energy storage device (100) of claim 8, wherein the blocking portion (37) comprises a plurality of first sections (371), the plurality of first sections (371) being disposed in the first face (353) in a radial arrangement of the first through holes (311), each first section (371) surrounding the first through hole (311), the first sections (371) tapering away from the first face (353).

10. The energy storage device (100) according to claim 8, wherein a longitudinal section of the blocking portion (37) parallel to the axial direction of the first through hole (311) includes a trapezoid-like shape, and an outer peripheral surface of the blocking portion (37) is a cambered surface (373) recessed toward the center of the first through hole (311).

11. The energy storage device (100) according to claim 1, wherein the connecting portion (32) includes a first boss (321) and a second boss (322), the first boss (321) is connected with the body (31), the second boss (322) is arranged on one surface of the first boss (321) facing away from the body (31), the first boss (321) is located between the body (31) and the second boss (322), the first through hole (311) penetrates through the body (31), the first boss (321) and the second boss (322), the welding area (35) is arranged on one surface of the second boss (322) facing away from the first boss (321), and the outer circumferential surface of the second boss (322) and the outer circumferential surface of the welding area (35) are all attached to the circumferential surface of the second through hole (51).

12. The energy storage device (100) according to claim 11, wherein the inner peripheral surface of the welding zone (35) is surrounded by a mounting hole (351), the mounting hole (351) is communicated with the first through hole (311), the diameter of the mounting hole (351) is larger than that of the first through hole (311), and the sealing member (70) is mounted to the mounting hole (351) and seals the first through hole (311).

13. The energy storage device (100) of claim 12, wherein the inner peripheral surface of the weld zone (35) has a first beveled surface (352), the seal (70) being mounted to the mounting hole (351) along the first beveled surface (352).

14. The energy storage device (100) according to claim 11, wherein the end cap (50) includes a main body portion (53) and a protruding portion (55), the protruding portion (55) extends from an end of an outer peripheral surface of the main body portion (53) away from the adapter (30) in a radial direction of the first through hole (311), the main body portion (53) abuts against the first boss (321), and the protruding portion (55) abuts against the housing (10).

15. The energy storage device (100) of claim 14, wherein the outer peripheral surface of the second boss (322) has a second inclined surface (3221), and the main body portion (53) is mounted to the first boss (321) along the second inclined surface (3221).

16. The energy storage device (100) according to claim 14, wherein a surface of the main body portion (53) remote from the adapter (30) is concavely formed with a groove (531), the groove (531) surrounding the second through hole (51).

17. The energy storage device (100) according to claim 16, wherein the welding zone (35) has a first face (353), the first face (353) being a surface of the welding zone (35) facing away from the body (31), the first face (353) being provided with a blocking portion (37) surrounding the first through hole (311), a height of the blocking portion (37) being equal to or less than a depth of the recess (531) in an axial direction of the first through hole (311).

18. A powered device comprising an energy storage device (100) as claimed in any one of claims 1 to 17, the energy storage device (100) powering the powered device.

19. The manufacturing method of the energy storage device (100) is characterized in that the energy storage device (100) comprises a shell (10), an electrode assembly (20), an adapter (30), an end cover (50) and a sealing member (70), the shell (10) is provided with an opening (11), the adapter (30) comprises a body (31), a connecting part (32) and a first through hole (311), the body (31) is provided with a first surface (313) and a second surface (314) which are oppositely arranged along the axial direction of the first through hole (311), the connecting part (32) is arranged on the first surface (313), the first through hole (311) penetrates through the body (31) and the connecting part (32), the connecting part (32) is provided with a welding zone (35), the welding zone (35) surrounds the first through hole (311), the end cover (50) is provided with a second through hole (51),

The manufacturing method of the energy storage device (100) comprises the following steps:

Welding the electrode assembly (20) to the second surface (314);

-mounting the electrode assembly (20) and the adapter (30) within the housing (10);

The end cover (50) is covered on the opening (11) of the shell (10), the edge of the end cover (50) is abutted against the edge of the opening (11) of the shell (10), the connecting part (32) is penetrated with the second through hole (51), at least part of the welding area (35) is exposed out of the end cover (50), and the outer peripheral surface of the welding area (35) is abutted against the peripheral surface of the second through hole (51);

welding at the abutment between the edge of the end cap (50) and the housing (10);

-mounting the seal (70) to the connection portion (32) and sealing the first through hole (311), the seal (70) being connected to the weld zone (35);

Welding is performed at the welding area (35) to fixedly connect the sealing member (70), the connecting portion (32) and the end cap (50).

20. The method of manufacturing according to claim 19, characterized in that the soldering zone (35) has a first face (353), the first face (353) being the surface of the soldering zone (35) facing away from the body (31), the first face (353) being provided with a barrier (37) surrounding the first through hole (311); the welding at the welding area (35) to fixedly connect the sealing member (70), the connecting portion (32) and the end cap (50) includes:

And carrying out melting treatment on the blocking part (37), wherein the melted blocking part (37) fills two opposite sides of the welding area (35) along the radial direction of the first through hole (311) so as to fixedly connect the sealing piece (70), the connecting part (32) and the end cover (50).

21. The manufacturing method according to claim 20, wherein a longitudinal section of the blocking portion (37) parallel to the axial direction of the first through hole (311) includes a trapezoid-like shape, and an outer peripheral surface of the blocking portion (37) is a cambered surface (373) recessed toward the center of the first through hole (311); the melt-processing of the barrier portion (37) includes:

a laser beam is irradiated onto the arc surface (373) of the blocking portion (37), and the blocking portion (37) is subjected to a melting process.

22. The method of manufacturing according to claim 20, wherein the blocking portion (37) includes a plurality of first portions (371), the plurality of first portions (371) being disposed on the first face (353) in a radial arrangement of the first through holes (311), each of the first portions (371) surrounding the first through holes (311), the first portions (371) tapering away from the first face (353); the melt-processing of the barrier portion (37) includes:

And carrying out melting treatment on the first subsection (371), wherein the melted first subsection (371) fills two opposite sides of the welding area (35) along the radial direction of the first through hole (311) so as to fixedly connect the sealing piece (70), the connecting part (32) and the end cover (50).