US-20260128355-A1 - Pressure Bonding Device

US20260128355A1US 20260128355 A1US20260128355 A1US 20260128355A1US-20260128355-A1

Abstract

The present invention provides a pressure bonding device including a base, a sealing cover, and a pressurizing assembly. The base is used to place a to-be-pressed member; the sealing cover is used to cooperate with the base to form a sealing space between the base and the sealing cover during pressure bonding operation; the pressurizing assembly is connected to the sealing cover, and the pressurizing assembly is used to apply pressure to a flexible medium in the sealing space to cause the to-be-pressed member to be pressed under the pressure of the flexible medium. The pressure bonding device can uniformly apply pressure to various positions of the to-be-pressed member, ensuring the uniformity of applying pressure on the to-be-pressed member and improving the pressure bonding effect and the performance of the battery.

Inventors

Weifeng Fang
WENJUAN LIU MATTIS

Assignees

MICROVAST, INC.

Dates

Publication Date: 20260507
Application Date: 20241105

Claims (20)

1 . A pressure bonding device comprising a base, a sealing cover, and a pressurizing assembly, wherein the base is configured to place a to-be-pressed member; the sealing cover is configured to cooperate with the base to form a sealing space between the base and the sealing cover during pressure bonding operation; the pressurizing assembly is connected to the sealing cover, and the pressurizing assembly is configured to apply pressure to a flexible medium in the sealing space to cause the to-be-pressed member to be pressed under the pressure of the flexible medium.
2 . The pressure bonding device as claimed in claim 1 , wherein the flexible medium comprises gas located in the sealing space, and the pressurizing assembly is configured to pressurize the gas in the sealing space to form high-pressure gas to apply pressure to the to-be-pressed member through the high-pressure gas; and/or, the flexible medium comprises a flexible pressing member provided in the sealing space, and the pressurizing assembly is configured to compress the flexible pressing member to apply pressure to the to-be-pressed member through the flexible pressing member.
3 . The pressure bonding device as claimed in claim 2 , wherein the flexible pressing member comprises a fluid bladder and/or a flexible film.
4 . The pressure bonding device as claimed in claim 1 , wherein the pressurizing assembly comprises a piston, the piston is located within the sealing cover and is slidably sealed with an inner wall of the sealing cover, and the sealing space is formed between the sealing cover, the piston and the base; the piston can apply pressure to the flexible medium in the sealing space when moving towards the base.
5 . The pressure bonding device as claimed in claim 4 , wherein the pressurizing assembly further comprises a piston rod and a driving device, the driving device is located outside the sealing cover, one end of the piston rod is connected to the driving device, and the other end of the piston rod passes through the sealing cover and is connected to the piston; the driving device is configured to drive the piston to move towards or away from the base within the sealing cover.
6 . The pressure bonding device as claimed in claim 5 , wherein the driving device is connected to the sealing cover, and the driving device is further configured to drive the sealing cover to move towards or away from the base.
7 . The pressure bonding device as claimed in claim 5 , wherein a hollow cavity communicated with the sealing space is provided inside the piston rod, and a pressure detection device is provided in the hollow cavity for detecting the pressure in the sealing space.
8 . The pressure bonding device as claimed in claim 5 , wherein the pressure bonding device further comprises a support frame, the support frame comprises a support plate, a guide plate, and several first guide shafts, the driving device is fixed on the support plate; the guide plate is located between the support plate and the sealing cover, one end of each first guide shaft is fixedly connected to the support plate, the guide plate is slidably connected to each first guide shaft; the driving device is connected to the guide plate, and one end of the piston rod is connected to the guide plate; the driving device is configured to drive the guide plate to move along an axial direction of the first guide shaft.
9 . The pressure bonding device as claimed in claim 8 , wherein the pressure bonding device further comprises a worktable, the base is arranged on the worktable; the other end of each first guide shaft is fixedly connected to the worktable.
10 . The pressure bonding device as claimed in claim 8 , wherein several linear bearings are provided on the guide plate, and the linear bearings are respectively sleeved on the first guide shafts.
11 . The pressure bonding device as claimed in claim 8 , wherein the driving device is connected to the guide plate through a floating joint.
12 . The pressure bonding device as claimed in claim 8 , wherein the support frame further comprises several second guide shafts, one end of each second guide shaft is fixedly connected to the sealing cover, and the other end of each second guide shaft is slidably connected to the guide plate; each second guide shaft is sleeved with an elastic member, and two opposite ends of the elastic member respectively abut against the guide plate and the sealing cover.
13 . The pressure bonding device as claimed in claim 1 , wherein the base comprises a support seat for placing the to-be-pressed member, and an opening is provided on one end of the sealing cover nearing the support seat; during pressure bonding operation, the open end of the sealing cover abuts against the support seat, and the sealing space is formed between the sealing cover and the support seat.
14 . The pressure bonding device as claimed in claim 13 , wherein the support seat is provided with several exhaust holes, and the exhaust holes penetrate the support seat; during pressure bonding operation, the gas between the to-be-pressed member and the support seat can be discharged through the exhaust holes.
15 . The pressure bonding device as claimed in claim 14 , wherein the base further comprises a flexible sealing member, the flexible sealing member is covered on the support seat, and the flexible sealing member covers the to-be-pressed member and the exhaust holes.
16 . The pressure bonding device as claimed in claim 15 , wherein the base further comprises an annular limiting member, the annular limiting member is covered at an edge portion of the flexible sealing member, and the annular limiting member is fixedly connected to the support seat.
17 . The pressure bonding device as claimed in claim 15 , wherein a second sealing ring is provided on a top surface of the support seat, the second sealing ring is arranged around a periphery of the to-be-pressed member, and the second sealing ring is located between the flexible sealing member and the support seat
18 . The pressure bonding device as claimed in claim 14 , wherein the support seat comprises a bottom plate and a protrusion connected to the bottom plate, the protrusion protrudes towards the sealing cover, the protrusion is configured to place the to-be-pressed member, the exhaust holes are provided on the protrusion; during pressure bonding operation, the sealing cover covers the protrusion, the open end of the sealing cover abuts against the bottom plate, and the sealing space is formed between the sealing cover and the protrusion.
19 . The pressure bonding device as claimed in claim 18 , wherein a third sealing ring is provided on an outer peripheral surface of the protrusion, and the third sealing ring is sandwiched between the outer peripheral surface of the protrusion and an inner wall of the sealing cover.
20 . The pressure bonding device as claimed in claim 1 , wherein the pressure bonding device further comprises a heating assembly for heating the base.

Description

TECHNICAL FIELD This invention relates to the field of battery manufacturing technology, and in particular to a pressure bonding device. BACKGROUND In the manufacturing process of batteries, it is usually necessary to apply pressure to some members, such as pressure bonding a lithium foil onto the surface of a member of a battery cell, or pressure bonding the electrode plate and the separator inside a battery cell, or pressure bonding the electrode tabs of multiple battery cells to achieve electrical connection between the battery cells. At present, flat hot pressing or rolling pressing is generally used to press the to-be-pressed member. Taking flat hot pressing as an example, the to-be-pressed member is placed between two flat hot pressing blocks in a hot press machine, and a certain pressure and temperature are provided by the hot pressing blocks to perform hot pressing on the to-be-pressed member, thereby achieving the function of pressure bonding. SUMMARY Due to the possibility that the surface of the to-be-pressed member may not have a flat structure (for example, the to-be-pressed member has local bending or height differences), in this case, the flat hot pressing or rolling pressing methods cannot guarantee the uniformity of pressure bonding at various positions of the to-be-pressed member, thereby affecting the pressure bonding effect and the performance of the battery assembled by the battery cells. The object of the present invention is to provide a pressure bonding device that can uniformly apply pressure to various positions of a to-be-pressed member, ensuring the uniformity of the pressure on the to-be-pressed member, and improving the pressure bonding effect and the performance of the battery. An embodiment of the present invention provides a pressure bonding device including a base, a sealing cover, and a pressurizing assembly, wherein the base is configured to place a to-be-pressed member; the sealing cover is configured to cooperate with the base to form a sealing space between the base and the sealing cover during pressure bonding operation; the pressurizing assembly is connected to the sealing cover, and the pressurizing assembly is configured to apply pressure to a flexible medium in the sealing space to cause the to-be-pressed member to be pressed under the pressure of the flexible medium. In an achievable manner, the flexible medium includes gas located in the sealing space, and the pressurizing assembly is configured to pressurize the gas in the sealing space to form high-pressure gas to apply pressure to the to-be-pressed member through the high-pressure gas; and/or, the flexible medium includes a flexible pressing member provided in the sealing space, and the pressurizing assembly is configured to compress the flexible pressing member to apply pressure to the to-be-pressed member through the flexible pressing member. In an achievable manner, the flexible pressing member includes a fluid bladder and/or a flexible film. In an achievable manner, the pressurizing assembly includes a piston, the piston is located within the sealing cover and is slidably sealed with an inner wall of the sealing cover, and the sealing space is formed between the sealing cover, the piston and the base; the piston can apply pressure to the flexible medium in the sealing space when moving towards the base. In an achievable manner, the pressurizing assembly further includes a piston rod and a driving device, the driving device is located outside the sealing cover, one end of the piston rod is connected to the driving device, and the other end of the piston rod passes through the sealing cover and is connected to the piston; the driving device is configured to drive the piston to move towards or away from the base within the sealing cover. In an achievable manner, the driving device is connected to the sealing cover, and the driving device is further configured to drive the sealing cover to move towards or away from the base. In an achievable manner, a hollow cavity communicated with the sealing space is provided inside the piston rod, and a pressure detection device is provided in the hollow cavity for detecting the pressure in the sealing space. In an achievable manner, the pressure bonding device further includes a support frame, the support frame includes a support plate, a guide plate, and several first guide shafts, the driving device is fixed on the support plate; the guide plate is located between the support plate and the sealing cover, one end of each first guide shaft is fixedly connected to the support plate, the guide plate is slidably connected to each first guide shaft; the driving device is connected to the guide plate, and one end of the piston rod is connected to the guide plate; the driving device is configured to drive the guide plate to move along an axial direction of the first guide shaft. In an achievable manner, the pressure bonding device further includes a worktable, the base is arra