Battery liquid injection device and method

Abstract

The application relates to a battery liquid injection device and a liquid injection method, which are used for injecting electrolyte into a battery in cooperation with a negative pressure cup module, and the device comprises a first cover body unit, a second cover body unit and a connecting pin assembly. 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 extending along the thickness direction of the first cover body to form a containing groove capable of containing electrolyte. The second cover body unit comprises a second cover body and the connecting pin assembly, the second cover body is provided with a connecting hole, the connecting pin assembly is movably connected with the second cover body, the connecting pin assembly is opposite to a high position area, and the connecting pin assembly comprises a connecting pin, a first limiting block and an elastic piece. During liquid injection, the second cover body is press-bonded to the first cover body, at this time, the electrolyte can enter the containing groove through the connecting hole and enter the battery through the first liquid inlet assembly. The application can effectively avoid the overflow or spatter of electrolyte during the battery liquid injection process, and can effectively avoid various problems of subsequent batteries, such as poor quality, and can improve the qualified rate of battery products.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery liquid injection device, in particular to a battery liquid injection device and a liquid injection method. BACKGROUND

[0002] Lithium ion battery has the advantages of high specific energy, multiple cycle times and long storage time, and is widely used not only in portable electronic devices such as mobile phones, digital cameras and laptop computers, but also in electric vehicles, electric bicycles and electric tools and other large and medium-sized electric devices. At present, the conventional liquid injection method of lithium ion battery is to first align the liquid injection nozzle of the liquid injection equipment with the liquid injection hole of the battery top cover, then press it down appropriately to realize sealing, and then inject electrolyte into the battery under a certain pressure. However, in the conventional liquid injection process, due to the instability of the liquid injection equipment or the wear of the liquid injection nozzle, the problems of electrolyte overflow or liquid injection may occur, thereby affecting the appearance of the battery, reducing the liquid injection efficiency, and also affecting the liquid injection amount of the battery, and in addition, it may also affect the performance of the battery.

[0003] In the prior art, the battery is usually wiped by hand to remove the electrolyte, but the defect of the prior art is that the battery may be contaminated during manual wiping, causing the short circuit of the pole and the shell, thereby causing the battery to be damaged and other problems, thereby reducing the qualified rate of battery production. Therefore, it is urgent to design a battery liquid injection device that can prevent electrolyte overflow. SUMMARY

[0004] Therefore, the technical problem to be solved by the present application is to overcome the shortcomings of the prior art, provide a battery liquid injection device and a liquid injection method, which can effectively prevent electrolyte overflow or splashing during battery liquid injection, thereby effectively preventing subsequent battery defects and other problems, and improving the qualified rate of battery products.

[0005] To solve the above technical problems, the present application provides a battery liquid injection device for cooperating with a negative pressure cup module to inject electrolyte into a battery, comprising,

[0006] A first cover unit comprising 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 groove bottom of the receiving groove is inclinedly arranged 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 and the liquid injection port of the battery are in communication during liquid injection;

[0007] A second cover unit comprises a second cover and a connecting pin assembly, the second cover is provided with a connecting hole, the connecting pin assembly is movably connected with the second cover, and the connecting pin assembly is opposite to the high position area, the connecting pin assembly comprises a connecting pin, a first limiting block and an elastic piece, the first limiting block is arranged at one end of the connecting pin, one end of the elastic piece is connected with the first limiting block, and the other end of the elastic piece is abutted against the accommodation groove; the connecting hole can accommodate the connecting pin to pass through, the first limiting block is located in the space between the first cover and the second cover, when liquid injection, the second cover is pressed and connected to the first cover, at this time, the electrolyte can enter the accommodation groove through the connecting hole and enter the battery through the first liquid inlet assembly.

[0008] In an embodiment of the present application, the first limiting block is arranged protruding along the radial direction of the connecting pin, and the first limiting block is coaxially arranged with the connecting pin, and the diameter of the projection of the first limiting block along the thickness direction of the first cover is greater than the diameter of the connecting hole.

[0009] In an embodiment of the present application, the end of the first limiting block in contact with the elastic piece is further provided with a guide column, and the elastic piece is sleeved on the guide column.

[0010] In an embodiment of the present application, the second cover unit further comprises a second limiting block arranged on the second cover, the number of the second limiting block is at least one, and the second limiting block is arranged adjacent to the connecting hole.

[0011] In an embodiment of the present application, the first liquid inlet assembly comprises a first liquid inlet and a first liquid inlet nozzle, the first liquid inlet is arranged on the groove bottom of the accommodation groove, the first liquid inlet nozzle is arranged on the bottom of the first cover, the first liquid inlet nozzle is in communication with the first liquid inlet, and the first liquid inlet nozzle is matched with the liquid injection port.

[0012] In an embodiment of the present application, the first cover unit further comprises a clamping portion, the clamping portion is arranged extending along the thickness direction of the first cover and protruding at the edge of the first cover; the outer side of the battery is provided with a recess portion in the circumferential direction, the clamping portion is matched with the recess portion, and the first cover can be clamped to the battery through the clamping portion.

[0013] In an embodiment of the present application, the first cover is further provided with an avoiding hole for avoiding the pole column of the battery, and the edge of the avoiding hole is provided with an annular blocking member.

[0014] In an embodiment of the present application, the first cover and the second cover are formed by PVDF injection molding, or the first cover and the second cover are formed by 3D printing.

[0015] In an embodiment of the present application, a sealing rubber ring is sleeved on the first limiting block.

[0016] The present application also provides a battery electrolyte injection method for injecting electrolyte into a battery by using the negative pressure cup module and the battery electrolyte injection device as described above, the injection method comprising,

[0017] Step S1, assembling the battery electrolyte injection device;

[0018] Step S2, assembling the first cover of the battery electrolyte injection device to the battery, so that the electrolyte injection port of the battery is in communication with the first liquid inlet assembly of the battery electrolyte injection device;

[0019] Step S2, pressing the negative pressure cup module to the second cover of the battery electrolyte injection device, at this time the second cover is subjected to a downward force, the second cover drives the first limiting block to press the elastic element, at this time the liquid inlet channel is formed at the connecting hole of the battery electrolyte injection device;

[0020] Step S3, injecting electrolyte into the liquid inlet channel, the electrolyte enters the storage groove and flows to the first liquid inlet assembly under the action of gravity, and then enters the battery through the first liquid inlet assembly;

[0021] Step S4, when the battery is completed, remove the negative pressure cup assembly, so that the battery electrolyte injection device and the battery form a sealed structure to seal the electrolyte injection port of the battery, and then remove the battery electrolyte injection device.

[0022] The above technical solutions of the present application have the following advantages compared with the prior art:

[0023] The battery liquid injection device provided by the application is provided with a first cover unit and a second cover unit, the first cover unit comprises a first cover and a first liquid inlet assembly, the groove bottom of the accommodating groove of the first cover is obliquely arranged to form a high position area and a low position area, the first liquid inlet assembly is arranged at the low position area, and the first liquid inlet assembly can be docked with the liquid injection port of the battery, the second cover unit comprises a second cover and a connecting pin assembly, the connecting pin assembly is movably connected with the second cover, and the connecting pin assembly is arranged opposite to the high position area, the connecting pin assembly comprises a connecting pin and an elastic piece, one end of the elastic piece is connected with the connecting pin, and the other end of the elastic piece abuts against the accommodating groove, in this way, when the negative pressure cup module presses down the second cover during liquid injection, the connecting pin can also be applied with downward force, so that a liquid inlet channel is formed at the connecting hole, so that the electrolyte can enter the accommodating groove through the liquid inlet channel and flow to the first liquid inlet assembly in the accommodating groove under the action of gravity, and then the electrolyte enters the liquid injection port of the battery through the first liquid inlet assembly, so that the liquid injection of the electrolyte is realized, after the electrolyte is filled, the negative pressure cup module is removed, so that the first cover unit, the second cover unit and the battery form a sealed overall structure, and the electrolyte cannot overflow from the liquid injection port. When subsequent other processing operations are performed, the first cover unit and the second cover unit are removed from the battery, so that the battery liquid injection device can effectively prevent the overflow or spatter of the electrolyte during the liquid injection of the battery, and various problems such as subsequent battery defects are effectively avoided, and the qualified rate of the battery product is improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to make the content of the application more easily understood, the application will be further described in detail below according to specific embodiments of the application and in combination with the drawings, in which.

[0025] Fig. 1 is the first perspective exploded view of the overall structure of the preferred embodiment of the application.

[0026] Fig. 2 is the second perspective exploded view of the overall structure of the preferred embodiment of the application.

[0027] Fig. 3 is the front perspective view of the exploded view of the overall structure of the preferred embodiment of the application.

[0028] Fig. 4 is the schematic view of the overall structure of the preferred embodiment of the application and the battery assembly.

[0029] The description of the drawings is as follows: 1, battery; 10, liquid injection port; 11, pole; 12, recess; 20, baffle; 2, first cover body; 21, accommodation groove; 22, clamping part; 24, annular enclosing part; 3, second cover body; 30, connecting hole; 31, connecting pin; 32, first limiting block; 320, sealing rubber ring; 33, elastic member; 34, guide column; 35, second limiting block; 36, first liquid inlet; 37, first liquid inlet nozzle. DETAILED DESCRIPTION

[0030] The application will be further described below with reference to the drawings and specific embodiments, so that those skilled in the art can better understand the application and implement it, but the embodiments are not limiting the application.

[0031] Referring to Figs. 1 to 4 The embodiment of the application discloses a battery liquid injection device for cooperating with a negative pressure cup module to inject electrolyte into a battery 1. Specifically, a liquid injection port 10 and a pole 11 are arranged at one end of the battery 1 in the height direction, and electrolyte can be injected into the battery through the liquid injection port 10.

[0032] The battery liquid injection device comprises a first cover body unit, and the first cover body unit comprises a first cover body 2 and a first liquid inlet assembly. The edge of the first cover body 2 has a baffle 20 extending in the thickness direction of the first cover body 2, the baffle 20 is arranged in the circumferential direction of the first cover body 2, and forms an accommodation groove 21 capable of accommodating electrolyte.

[0033] The groove bottom of the accommodation groove 21 is arranged obliquely to form a high area and a low area, and the first liquid inlet assembly is arranged in the low area. When liquid injection, the first liquid inlet assembly and the liquid injection port 10 of the battery 1 are in communication with each other.

[0034] Further, the battery liquid injection device further comprises a second cover body unit, and the second cover body unit comprises a second cover body 3 and a connecting pin assembly, and the connecting pin assembly is movably connected with the second cover body 3. It should be noted that the connecting pin assembly is opposite to the high area after the second cover body unit and the first cover body unit are assembled.

[0035] Specifically, the connecting pin assembly comprises a connecting pin 31, a first limiting block 32 and an elastic member 33. The second cover is provided with a connecting hole 30, which can accommodate the connecting pin 31. When the first cover 2 is assembled with the second cover 3, one end of the connecting pin 31 is inserted into the connecting hole 30, and the first limiting block 32 is arranged at the other end of the connecting pin 31. One end of the elastic member 33 is connected with the first limiting block 32, and the other end of the elastic member 33 abuts against the accommodating groove 21. The first limiting block 32 is located in the space between the first cover 2 and the second cover 3.

[0036] In this way, when the liquid injection is performed, the second cover 3 is pressed to the first cover 2. At this time, since the elastic member 33 is arranged between the first limiting block 32 and the accommodating groove, the second cover 3 can press the first limiting block 32 downward, so that the first limiting block 32 moves downward. When the first limiting block 32 is continuously pressed, a gap is formed at the connecting hole 30, i.e. a liquid inlet channel is formed. The electrolyte can enter the accommodating groove 21 through the liquid inlet channel. Then, under the action of gravity, the electrolyte can flow from the high position area to the low position area, and enter the battery through the first liquid inlet assembly, so as to realize the liquid injection.

[0037] It can be known that the battery liquid injection device provided by the application is provided with a first cover unit and a second cover unit, the first cover unit comprises a first cover 2 and a first liquid injection assembly, the groove bottom of the accommodating groove 21 of the first cover 2 is obliquely arranged to form a high position area and a low position area, the first liquid injection assembly is arranged in the low position area, and the first liquid injection assembly can be docked with the liquid injection port 10 of the battery 1, the second cover unit comprises a second cover 3 and a connecting pin assembly, the connecting pin assembly is movably connected with the second cover 3, and the connecting pin assembly is arranged opposite to the high position area, the connecting pin assembly comprises a connecting pin 31 and an elastic piece 33, one end of the elastic piece 33 is connected with the connecting pin 31, and the other end of the elastic piece 33 is abutted to the accommodating groove 21. In this way, when the negative pressure cup module presses the second cover 3 during liquid injection, a downward force can also be applied to the connecting pin 31, so that a liquid injection channel is formed at the connecting hole 30, so that the electrolyte can enter the accommodating groove 21 through the liquid injection channel and flow to the first liquid injection assembly in the accommodating groove 21 under the action of gravity, and then enter the liquid injection port 10 of the battery 1 through the first liquid injection assembly, so as to realize the liquid injection of the electrolyte. After 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 whole structure, and the electrolyte cannot overflow from the liquid injection port. When subsequent other processing operations are performed, the first cover unit and the second cover unit are removed from the battery 1. The battery liquid injection device can effectively prevent the overflow or spatter of the electrolyte during the battery liquid injection process, thereby effectively preventing various problems such as battery defects in the subsequent process, and improving the qualified rate of battery products.

[0038] As a preferred embodiment, the first limiting block 32 is protrudingly arranged along the radial direction of the connecting pin 31. Preferably, the first limiting block 32 is coaxially arranged with the connecting pin 31, and the projection of the first limiting block 32 along the thickness direction of the first cover 2 has a diameter greater than that of the connecting hole 30. In this way, when the first limiting block 32 is driven to move along the thickness direction of the first cover 2, the first limiting block 32 can be limited in the space between the first cover 2 and the second cover 3.

[0039] In a further embodiment, in order to ensure that the movement direction of the elastic piece 33 is consistent with the thickness direction of the second cover 3, the end of the first limiting block 32 in contact with the elastic piece 33 is provided with a guide column 34, and the elastic piece 33 is sleeved on the guide column 34.

[0040] The elastic piece 33 includes but is not limited to a spring.

[0041] As a preferred embodiment, in order to limit the movement of the second cover 3, avoid continuous pressing of the first cover 2 to cause damage to the battery, and also avoid excessive extrusion of the elastic member 33 to cause damage to the elastic member, the second cover unit further comprises a second limiting block 35 arranged on the second cover 3. The number of the second limiting block 35 is at least one, and the second limiting block 35 is arranged adjacent to the connecting hole 30.

[0042] Preferably, the second limiting block 35 is provided with four, and the four second limiting blocks 35 are arranged around the connecting hole 30. The four second limiting blocks 35 are sequentially arranged to form a cylindrical receiving space, which can accommodate the connecting pin assembly.

[0043] In detail, the first liquid inlet assembly includes a first liquid inlet 36 and a first liquid inlet nozzle 37. The first liquid inlet 36 is arranged on the bottom of the receiving groove 21, and the first liquid inlet nozzle 37 is arranged on the bottom of the first cover 2. The first liquid inlet nozzle 37 is in communication with the first liquid inlet 36, and is configured to match the liquid injection port 10.

[0044] In a further embodiment, the first cover unit further comprises a clamping portion 22, which is arranged along the thickness direction of the first cover 2 and protrudes from the edge of the first cover 2. Accordingly, the outer side of the battery 1 is provided with a recess 12 along the circumference, and the clamping portion 22 matches the structure of the recess 12. In this way, the first cover 2 can be clamped to the recess of the battery through the clamping portion 22 to ensure the stability during the liquid injection process.

[0045] As a preferred embodiment, the first cover 2 is further provided with an avoidance hole for avoiding the pole 11 of the battery. The edge of the avoidance hole is provided with an annular blocking member 24. In detail, the annular blocking member 24 is arranged along the height direction to cooperate with the receiving groove 21 to buffer and accommodate the electrolyte.

[0046] During the manufacturing process of the battery liquid injection device, the first cover 2 and the second cover 3 can be formed by PVDF injection molding. Alternatively, in some other embodiments, the first cover 2 and the second cover 3 can also be formed by 3D printing.

[0047] In order to seal the connecting pin assembly and prevent the electrolyte from overflowing from the connecting hole 30 after the injection is completed, a sealing rubber ring 320 is arranged on the first limiting block 32. The sealing rubber ring 320 is located between the first limiting block 32 and the lower surface of the second cover 3 to achieve the sealing effect. In detail, the material of the connecting pin 31 includes but is not limited to stainless steel, and the sealing rubber ring 320 is made of corrosion-resistant material.

[0048] As a preferred embodiment, the angle between the plane where the groove bottom of the accommodating groove 21 is located and the horizontal direction is 1°-15°.

[0049] Embodiment two of the present application also discloses a battery injection method, which uses a negative pressure cup module and a battery injection device as described in embodiment one to inject electrolyte into a battery. The injection method comprises,

[0050] Step S1, assembling the battery injection device;

[0051] Step S2, assembling the first cover 2 of the battery injection device to the battery 1, so that the injection port 10 of the battery 1 communicates with the first liquid inlet assembly of the battery injection device;

[0052] Step S2, pressing the negative pressure cup module to the second cover 3 of the battery injection device. At this time, the second cover 3 is subjected to a downward force, and the second cover 3 drives the first limiting block 32 to press the elastic piece 33. At this time, the connecting hole 30 of the battery injection device forms a liquid inlet channel;

[0053] Step S3, injecting electrolyte into the liquid inlet channel. The electrolyte enters the accommodating groove 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;

[0054] Step S4, after the battery is injected, the negative pressure cup assembly is removed, and the battery injection device and the battery form a sealed structure to close the injection port 10 of the battery 1, effectively preventing the electrolyte from overflowing or splashing. Subsequently, the battery injection device is removed.

[0055] As a preferred embodiment, in step S1, the step of assembling the battery injection device comprises:

[0056] Step S11, forming the first cover 2 and the second cover 3 by injection molding or 3D printing;

[0057] Step S12, installing a connecting pin assembly on the second cover 3 to form a second cover unit;

[0058] Step S13, connecting the first cover unit and the second cover unit by ultrasonic welding;

[0059] Step S14, checking the operation of the connecting pin assembly and performing the air tightness monitoring, and if the requirements are met, the assembly of the battery liquid injection device is completed.

[0060] In the description of the embodiments of the application, it should also be noted that, unless otherwise explicitly specified and limited, if the terms "set", "connect" should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected, can be mechanically connected, can be electrically connected, can be directly connected, can be indirectly connected through an intermediate medium, or can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0061] In the description of the application, it should be understood that the terms "first", "second" are only used for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0062] In the present application, unless otherwise explicitly specified and limited, the terms "mount", "connect", "connect", "fix" and other terms should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrated; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium; can be the communication inside two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0063] Obviously, the above embodiments are only examples for clear illustration, and are not limited to the implementation. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and impossible to enumerate all the implementation. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

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 injection 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. At this time, the second cover is subjected to a downward force, and the second cover drives the first limit block to press the elastic member downward, thereby forming 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 module, 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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