Battery electrolyte injection device and electrolyte injection method

Abstract

The invention relates to a battery liquid injection device and a liquid injection method, the battery liquid injection device is used for being matched with a negative pressure cup module to inject electrolyte to a battery, the battery liquid injection device comprises a first cover body unit, the first cover body unit comprises a first cover body and a first liquid inlet assembly, and the edge of the first cover body is provided with a baffle plate extending along the thickness direction of the first cover body so as to form an accommodating groove capable of accommodating the electrolyte; the second cover body unit comprises a second cover body and a connecting pin assembly, a connecting hole is formed in the second cover body, the connecting pin assembly is movably connected with the second cover body, the connecting pin assembly is opposite to the high-position area, and when the connecting pin assembly comprises a connecting pin, a first limiting block and an elastic piece, the second cover body is connected to the first cover body in a pressing mode; at the moment, the electrolyte can enter the containing groove through the connecting hole and enter the battery through the first liquid inlet assembly. According to the invention, the electrolyte can be effectively prevented from overflowing or splashing in the battery liquid injection process, so that various problems such as subsequent poor batteries are effectively avoided, and the qualified rate of battery products is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery liquid injection devices, and in particular to a battery liquid injection device and a liquid injection method. Background Art

[0002] Lithium-ion batteries have advantages such as high specific energy, many cycles, and long storage time. They are widely used not only in portable electronic devices such as mobile phones, digital cameras, and laptops, but also in large and medium-sized electric devices such as electric vehicles, electric bicycles, and power tools. At present, the conventional method of filling lithium-ion batteries is to first align the injection nozzle of the injection equipment with the injection hole on the top cover of the battery, then press down appropriately to achieve a seal, and inject the electrolyte into the battery under a certain pressure. However, during the conventional injection process, due to reasons such as instability of the injection equipment or wear of the injection nozzle, electrolyte overflow or spraying may occur, which will affect the appearance of the battery, reduce the injection efficiency, and also affect the injection volume of the battery. In addition, it may also affect the performance of the battery cell.

[0003] In existing methods, batteries are typically cleaned manually to remove electrolyte. However, this technique can contaminate the battery, causing a short circuit between the terminal and the housing, which can damage the battery and reduce the yield rate of battery production. Therefore, there is an urgent need to design a battery filling device that can prevent electrolyte overflow. Summary of the Invention

[0004] To this end, the technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a battery filling device and filling method that can effectively avoid overflow or splashing of electrolyte during the battery filling process, thereby effectively avoiding various problems such as subsequent battery defects and improving the qualification rate of battery products.

[0005] In order to solve the above technical problems, the present invention provides a battery filling device for cooperating with a negative pressure cup module to fill electrolyte into the battery, comprising: The first cover unit includes a first cover and a first liquid inlet assembly. The edge of the first cover has a baffle extending in the thickness direction of the first cover to form a receiving groove capable of accommodating electrolyte. The bottom of the receiving groove is inclined to form a high area and a low area. The first liquid inlet assembly is arranged in the low area. During liquid injection, the first liquid inlet assembly is connected to the liquid injection port of the battery. The second cover unit includes a second cover and a connecting pin assembly, a connecting hole is provided on the second cover, the connecting pin assembly is movably connected to the second cover, and the connecting pin assembly is opposite to the high-position area, the connecting pin assembly includes a connecting pin, a first limit block and an elastic member, the first limit block is provided at one end of the connecting pin, one end of the elastic member is connected to the first limit block, and the other end of the elastic member abuts against the receiving groove; the connecting hole can accommodate the connecting pin to pass through, the first limit block is located in the space between the first cover and the second cover, when injecting liquid, the second cover is pressed onto the first cover, at this time the electrolyte can enter the receiving groove through the connecting hole, and enter the battery through the first liquid inlet assembly.

[0006] In one embodiment of the present invention, the first limit block is protruding along the radial direction of the connecting pin, and the first limit block is coaxially arranged with the connecting pin, and the diameter of the projection of the first limit block along the thickness direction of the first cover body is larger than the diameter of the connecting hole.

[0007] In one embodiment of the present invention, the end of the first limiting block that contacts the elastic member further includes a guide post, and the elastic member is sleeved on the guide post.

[0008] In one embodiment of the present invention, the second cover unit further includes a second limiting block provided on the second cover, there is at least one second limiting block, and the second limiting block is adjacent to the connecting hole.

[0009] In one embodiment of the present invention, the first liquid inlet component includes a first liquid inlet and a first liquid inlet nozzle, the first liquid inlet is opened at the bottom of the receiving tank, the first liquid inlet nozzle is arranged at the bottom of the first cover body, and the first liquid inlet nozzle is connected to the first liquid inlet, and the first liquid inlet nozzle is matched with the liquid injection port.

[0010] In one embodiment of the present invention, the first cover unit further includes a clamping portion, which extends along the thickness direction of the first cover and protrudes from the edge of the first cover; a recessed portion is circumferentially provided on the outer side of the battery, and the clamping portion matches the recessed portion, so that the first cover can be clamped to the battery through the clamping portion.

[0011] In one embodiment of the present invention, the first cover is further provided with an escape hole for evading the pole of the battery, and an annular enclosure is provided at the edge of the escape hole.

[0012] In one embodiment of the present invention, the first cover body and the second cover body are formed by PVDF injection molding, or the first cover body and the second cover body are formed by 3D printing.

[0013] In one embodiment of the present invention, a sealing rubber ring is sleeved on the first limiting block.

[0014] The present invention also provides a battery injection method, which uses a negative pressure cup module and a battery injection device as described above to inject electrolyte into a battery. The injection method includes: Step S1, assembling the battery liquid injection device; Step S2, assembling the first cover of the battery liquid filling device to the battery, so that the liquid filling port of the battery is connected to the first liquid inlet component of the battery liquid filling device; Step S2: Pressing the negative pressure cup module onto the second cover of the battery liquid filling device. The second cover is then subjected to a downward force, which drives the first limit block to press the elastic member downward. This forms a liquid inlet channel at the connection hole of the battery liquid filling device. Step S3: injecting electrolyte into the liquid inlet channel; the electrolyte enters the receiving tank and flows to the first liquid inlet assembly under the action of gravity, and then enters the battery through the first liquid inlet assembly; Step S4, when the battery is completely filled with liquid, remove the negative pressure cup assembly so that the battery filling device and the battery form a sealing structure to close the battery's filling port, and then remove the battery filling device later.

[0015] The above technical solution of the present invention has the following advantages over the prior art: A battery liquid filling device described in the present invention is provided with a first cover unit and a second cover unit, the first cover unit includes a first cover and a first liquid inlet assembly, the bottom of the receiving groove of the first cover is tilted to form a high position area and a low position area, the first liquid inlet assembly is arranged in the low position area, and the first liquid inlet assembly can be docked with the liquid filling port of the battery, the second cover unit includes a second cover and a connecting pin assembly, the connecting pin assembly is movably connected to the second cover, at the same time, the connecting pin assembly is arranged relative to the high position area, the connecting pin assembly includes a connecting pin and an elastic member, one end of the elastic member is connected to the connecting pin It is connected to the first cover body, and the other end abuts against the receiving tank. With such an arrangement, when injecting liquid, when the negative pressure cup module presses down the second cover body, it can also apply a downward force to the connecting pin, so that a liquid inlet channel can be formed at the connecting hole, so that the electrolyte can enter the receiving tank through the liquid inlet channel, and flow to the first liquid inlet component under the action of gravity in the receiving tank, and enter the liquid injection port of the battery through the first liquid inlet component to realize the injection of the electrolyte. When the electrolyte is filled, the negative pressure cup module is removed, so that the first cover body unit, the second cover body unit and the battery form a sealed overall structure, and the electrolyte cannot overflow from the liquid injection port. When other processing operations are performed subsequently, the first cover body unit and the second cover body unit can be removed from the battery. The battery injection device of the present invention can effectively avoid the overflow or splashing of the electrolyte during the battery injection process, thereby effectively avoiding various problems such as subsequent battery defects, and improving the qualified rate of battery products. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings, wherein:

[0017] Figure 1 It is an exploded view from the first perspective of the overall structure of the preferred embodiment of the present invention.

[0018] Figure 2 It is an exploded view from a second perspective of the overall structure of the preferred embodiment of the present invention.

[0019] Figure 3 It is a front perspective view of an exploded view of the overall structure of a preferred embodiment of the present invention.

[0020] Figure 4 It is a schematic diagram of the overall structure and battery assembly of a preferred embodiment of the present invention.

[0021] Explanation of the reference numerals in the accompanying drawings in the specification: 1. battery; 10. liquid filling port; 11. pole; 12. recessed portion; 20. baffle; 2. first cover body; 21. receiving groove; 22. clamping portion; 24. annular enclosure; 3. second cover body; 30. connecting hole; 31. connecting pin; 32. first limit block; 320. sealing rubber ring; 33. elastic member; 34. guide column; 35. second limit block; 36. first liquid inlet; 37. first liquid inlet nozzle. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0023] Reference Figures 1 to 4 As shown, the first embodiment of the present invention discloses a battery filling device for cooperating with a negative pressure cup module to fill electrolyte into a battery 1. Specifically, a filling port 10 and a terminal 11 are provided along one end of the height direction of the battery 1, and electrolyte can be added to the battery through the filling port 10.

[0024] The battery liquid injection device includes a first cover unit, which includes a first cover 2 and a first liquid inlet assembly. The edge of the first cover 2 has a baffle 20 extending along the thickness of the first cover 2. The baffle 20 is arranged along the circumference of the first cover 2 and forms a receiving groove 21 capable of accommodating electrolyte.

[0025] The bottom of the receiving groove 21 is tilted to form a high area and a low area. The first liquid inlet component is arranged in the low area. When injecting liquid, the first liquid inlet component is connected to the liquid injection port 10 of the battery 1.

[0026] Furthermore, the battery filling device further includes a second cover unit, which includes a second cover 3 and a connecting pin assembly, wherein the connecting pin assembly is movably connected to the second cover 3. It should be noted that after the second cover unit is assembled with the first cover unit, the connecting pin assembly is opposite to the high-position area.

[0027] Specifically, the connecting pin assembly includes a connecting pin 31, a first stopper 32, and an elastic member 33. The second cover body is provided with a connecting hole 30 capable of accommodating the connecting pin 31. When the first cover body 2 and the second cover body 3 are assembled, one end of the connecting pin 31 is inserted into the connecting hole 30, and the first stopper 32 is provided at the other end of the connecting pin 31. One end of the elastic member 33 is connected to the first stopper 32, and the other end of the elastic member 33 abuts the receiving groove 21. The first stopper 32 is located in the space between the first cover body 2 and the second cover body 3.

[0028] In this way, when liquid is injected, the second cover body 3 is pressed against the first cover body 2. At this time, since the elastic member 33 is provided between the first limit block 32 and the receiving groove, the second cover body 3 can press down the first limit block 32, so that the first limit block 32 moves downward, and the first limit block 32 is continuously pressed down, so that a gap can be formed at the connecting hole 30, that is, a liquid inlet channel is formed, and the electrolyte can enter the receiving groove 21 through the liquid inlet channel. Then, the electrolyte can flow from the high-position area to the low-position area under the action of gravity, and enter the battery through the first liquid inlet component to achieve liquid injection.

[0029] It can be seen from this that a battery liquid injection device to be protected by the present invention is provided with a first cover unit and a second cover unit, the first cover unit includes a first cover 2 and a first liquid inlet assembly, the bottom of the receiving groove 21 of the first cover 2 is tilted to form a high area and a low area, the first liquid inlet assembly is arranged in the low area, and the first liquid inlet assembly can be docked with the liquid injection port 10 of the battery 1, the second cover unit includes a second cover 3 and a connecting pin assembly, the connecting pin assembly is movably connected to the second cover 3, at the same time, the connecting pin assembly is arranged relative to the high area, the connecting pin assembly includes a connecting pin 31 and an elastic member 33, one end of the elastic member 33 It is connected to the connecting pin 31, and the other end abuts against the receiving groove 21. With such a configuration, when the negative pressure cup module presses down the second cover 3 during liquid injection, it can also apply a downward force to the connecting pin 31, thereby forming a liquid inlet channel at the connecting hole 30, so that the electrolyte can enter the receiving groove 21 through the liquid inlet channel, and flow to the first liquid inlet component under the action of gravity in the receiving groove 21, and enter the liquid injection port 10 of the battery 1 through the first liquid inlet component to realize the injection of the electrolyte. When the electrolyte is filled, the negative pressure cup module is removed, so that the first cover unit, the second cover unit and the battery 1 form a sealed integral structure, and the electrolyte cannot overflow from the liquid injection port. When other processing operations are performed subsequently, the first cover unit and the second cover unit can be removed from the battery 1. The battery injection device of the present invention can effectively prevent the overflow or splashing of the electrolyte during the battery injection process, thereby effectively avoiding various problems such as subsequent battery defects, and improving the qualified rate of battery products.

[0030] In a preferred embodiment, the first stopper 32 protrudes radially from the connecting pin 31. Preferably, the first stopper 32 is coaxial with the connecting pin 31, and the diameter of the projection of the first stopper 32 along the thickness direction of the first cover 2 is greater than the diameter of the connecting hole 30. With this configuration, the first stopper 32, when driven to move along the thickness direction of the first cover 2, can be confined within the space between the first cover 2 and the second cover 3.

[0031] In a further embodiment, in order to ensure that the movement direction of the elastic member 33 is consistent with the thickness direction of the second cover body 3, the end of the first limit block 32 that contacts the elastic member 33 also has a guide column 34, and the elastic member 33 is sleeved on the guide column 34.

[0032] The elastic member 33 includes but is not limited to a spring.

[0033] As a preferred embodiment, in order to limit the movement of the second cover body 3 to prevent it from continuously pressing down on the first cover body 2 and causing damage to the battery, and also to avoid excessive squeezing of the elastic member 33 and causing damage to the elastic member, the second cover body unit also includes a second limit block 35 arranged on the second cover body 3, and the number of the second limit block 35 is at least one, and the second limit block 35 is arranged adjacent to the connecting hole 30.

[0034] Preferably, four second limiting blocks 35 are provided, and the four second limiting blocks 35 are arranged around the connecting hole 30 , and the four second limiting blocks 35 are sequentially surrounded to form a cylindrical receiving space, and the receiving space can accommodate the connecting pin assembly.

[0035] In terms of details, the first liquid inlet component includes a first liquid inlet 36 and a first liquid inlet nozzle 37. The first liquid inlet 36 is opened at the bottom of the receiving groove 21, and the first liquid inlet nozzle 37 is arranged at the bottom of the first cover body 2, and the first liquid inlet nozzle 37 is connected to the first liquid inlet 36. The first liquid inlet nozzle 37 is configured to match the liquid injection port 10.

[0036] In a further embodiment, the first cover unit further includes a snap-fit ​​portion 22, which extends along the thickness direction of the first cover 2 and protrudes from the edge of the first cover 2. Accordingly, a recessed portion 12 is circumferentially provided on the outer side of the battery 1, and the snap-fit ​​portion 22 matches the structure of the recessed portion 12. Thus, the first cover 2 can be fastened to the recessed portion of the battery via the snap-fit ​​portion 22 to ensure stability during the injection process.

[0037] As a preferred embodiment, the first cover 2 is further provided with an escape hole for evading the battery post 11, and an annular enclosure 24 is provided at the edge of the escape hole. Specifically, the annular enclosure 24 extends in the height direction to cooperate with the receiving groove 21 to buffer and contain the electrolyte.

[0038] During the manufacturing process of the battery liquid injection device, the first cover body 2 and the second cover body 3 can be formed by PVDF injection molding; or, in some other embodiments, the first cover body 2 and the second cover body 3 can also be formed by 3D printing.

[0039] After the electrolyte is injected, a sealing rubber ring 320 is mounted on the first stopper 32 to seal the connecting pin assembly and prevent the electrolyte from overflowing from the connecting hole 30. The sealing rubber ring 320 is positioned between the first stopper 32 and the lower surface of the second cover 3 to achieve a seal. Specifically, the connecting pin 31 is made of, but not limited to, stainless steel, and the sealing rubber ring 320 is made of a corrosion-resistant material.

[0040] As a preferred embodiment, the angle between the plane where the bottom of the receiving groove 21 is located and the horizontal direction is 1°-15°.

[0041] The second embodiment of the present invention further discloses a battery filling method, which uses a negative pressure cup module and a battery filling device as described in the first embodiment to fill the battery with electrolyte. The filling method includes: Step S1, assembling the battery liquid injection device; Step S2, assembling the first cover 2 of the battery liquid filling device to the battery 1, so that the liquid filling port 10 of the battery 1 is in communication with the first liquid inlet assembly of the battery liquid filling device; Step S2: Press-fit the negative pressure cup module to the second cover 3 of the battery liquid filling device. The second cover 3 is then subjected to a downward force, which drives the first limit block 32 to press the elastic member 33 downward. Thus, a liquid inlet channel is formed at the connection hole 30 of the battery liquid filling device. Step S3: injecting electrolyte into the liquid inlet channel; the electrolyte enters the receiving tank 21 and flows to the first liquid inlet assembly under the action of gravity, and then enters the battery 1 through the first liquid inlet assembly; In step S4, after the battery is filled with electrolyte, the negative pressure cup assembly is removed, so that the battery filling device and the battery form a sealed structure to seal the filling port 10 of the battery 1, effectively preventing electrolyte overflow or splashing. The battery filling device is subsequently removed.

[0042] As a preferred embodiment, in step S1, the step of assembling the battery liquid injection device includes: Step S11, forming the first cover 2 and the second cover 3 by injection molding or 3D printing; Step S12, installing a connecting pin assembly on the second cover 3 to form a second cover unit; Step S13, connecting the first cover unit and the second cover unit by ultrasonic welding; Step S14: Check whether the connecting pin assembly operates smoothly and monitors air tightness. If the requirements are met, the assembly of the battery liquid injection device is completed.

[0043] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0044] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0045] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0046] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A battery filling device, used in conjunction with a negative pressure cup module to add electrolyte to a battery, characterized by: include, The first cover unit includes a first cover and a first liquid inlet assembly. The edge of the first cover has a baffle extending in the thickness direction of the first cover to form a receiving groove capable of accommodating electrolyte. The bottom of the receiving groove is inclined to form a high area and a low area. The first liquid inlet assembly is arranged in the low area. During liquid injection, the first liquid inlet assembly is connected to the liquid injection port of the battery. The second cover unit includes a second cover and a connecting pin assembly, a connecting hole is provided on the second cover, the connecting pin assembly is movably connected to the second cover, and the connecting pin assembly is opposite to the high-position area, the connecting pin assembly includes a connecting pin, a first limit block and an elastic member, the first limit block is provided at one end of the connecting pin, one end of the elastic member is connected to the first limit block, and the other end of the elastic member abuts against the receiving groove; the connecting hole can accommodate the connecting pin to pass through, the first limit block is located in the space between the first cover and the second cover, when injecting liquid, the second cover is pressed onto the first cover, at this time the electrolyte can enter the receiving groove through the connecting hole, and enter the battery through the first liquid inlet assembly.

2. A battery liquid filling device according to claim 1, characterized in that: The first limit block is protruding along the radial direction of the connecting pin, and the first limit block is coaxially arranged with the connecting pin. The diameter of the projection of the first limit block along the thickness direction of the first cover body is larger than the diameter of the connecting hole.

3. A battery liquid filling device according to claim 1 or 2, characterized in that: One end of the first limiting block that contacts the elastic member is further provided with a guide post, and the elastic member is sleeved on the guide post.

4. The battery liquid filling device according to claim 1, characterized in that: The second cover unit further includes a second limiting block provided on the second cover, the number of the second limiting block is at least one, and the second limiting block is adjacent to the connecting hole.

5. The battery liquid filling device according to claim 1, characterized in that: The first liquid inlet component includes a first liquid inlet and a first liquid inlet nozzle. The first liquid inlet is opened at the bottom of the receiving tank. The first liquid inlet nozzle is arranged at the bottom of the first cover body, and the first liquid inlet nozzle is connected to the first liquid inlet. The first liquid inlet nozzle matches the liquid injection port.

6. The battery liquid filling device according to claim 1, characterized in that: The first cover unit also includes a clamping portion, which extends along the thickness direction of the first cover and protrudes from the edge of the first cover; a recessed portion is circumferentially provided on the outer side of the battery, and the clamping portion matches the recessed portion, so that the first cover can be clamped to the battery through the clamping portion.

7. The battery liquid filling device according to claim 1, characterized in that: The first cover body is further provided with an escape hole for avoiding the pole of the battery, and an annular enclosure is provided at the edge of the escape hole.

8. The battery liquid filling device according to claim 1, characterized in that: The first cover body and the second cover body are formed by PVDF injection molding, or the first cover body and the second cover body are formed by 3D printing.

9. The battery liquid filling device according to claim 1, characterized in that: The first limiting block is sleeved with a sealing rubber ring.

10. A battery filling method, characterized in that: The electrolyte is added to the battery using the negative pressure cup module and the battery filling device according to any one of claims 1 to 9, wherein the filling method includes: Step S1, assembling the battery liquid injection device; Step S2, assembling the first cover of the battery liquid filling device to the battery, so that the liquid filling port of the battery is connected to the first liquid inlet component of the battery liquid filling device; Step S2: Pressing the negative pressure cup module onto the second cover of the battery liquid filling device. The second cover is then subjected to a downward force, which drives the first limit block to press the elastic member downward. This forms a liquid inlet channel at the connection hole of the battery liquid filling device. Step S3: injecting electrolyte into the liquid inlet channel; the electrolyte enters the receiving tank and flows to the first liquid inlet assembly under the action of gravity, and then enters the battery through the first liquid inlet assembly; Step S4, when the battery is completely filled with liquid, remove the negative pressure cup assembly so that the battery filling device and the battery form a sealing structure to close the battery's filling port, and then remove the battery filling device later.

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