Battery injection device and injection method

Abstract

The present invention discloses a battery liquid injection device and liquid injection method, comprising a liquid injection nozzle and a liquid injection cup for storing electrolyte, wherein the electrolyte in the liquid injection cup is injected into the battery shell through the liquid injection nozzle; wherein the liquid injection cup comprises a block, a gap is provided between the bottom edge of the block and the inner wall of the cup body, wherein the air inlet and outlet are located above the block, the air inlet and outlet are connected to the bottom of the block through the gap, the liquid injection port passes through the lower surface of the block, and a liquid injection head is installed on the lower surface of the block. The present invention has the advantages of preventing electrolyte from being sucked back into the air inlet and outlet, causing inaccurate liquid injection accuracy and residual electrolyte in the air inlet and outlet.

Description

Technical Field

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

[0002] With the rapid development of the battery industry, automatic liquid injection is widely used in the battery production process because of its high yield and fast production speed. However, the existing battery liquid injection equipment is unstable during liquid injection, which can easily cause the electrolyte to be sucked back into the pipeline, resulting in inaccurate liquid injection accuracy and residual electrolyte in the pipeline; in addition, when the liquid injection nozzle of the liquid injection mechanism contacts the battery liquid injection port during liquid injection, a direct collision occurs, which can easily cause damage to the battery. Summary of the invention

[0003] The technical problem to be solved by the embodiments of the present invention is to provide a liquid injection device and a liquid injection method to solve the problem of direct collision between the liquid injection nozzle and the battery liquid injection port when contacting and the electrolyte being sucked back into the pipeline during liquid injection.

[0004] In order to solve the above technical problems, the first aspect of the present invention provides a battery filling device, the battery filling device includes a filling mechanism, the filling mechanism is provided with a plurality of, the plurality of the filling mechanisms are arranged in a plurality of rows along the horizontal direction, the filling mechanism includes a filling nozzle and a filling cup for storing electrolyte, the electrolyte in the filling cup is injected into the battery shell through the filling nozzle; wherein,

[0005] A liquid filling cup, comprising a cup body, a block, a liquid filling port and an air inlet and outlet, wherein the liquid filling port and the air inlet and outlet are arranged at the top of the liquid filling cup, the cup body has a cylindrical hollow structure, the top of the block is fixed on the inner top surface of the cup body, a gap is provided between the bottom edge of the block and the inner wall of the cup body, wherein the air inlet and outlet are located above the block, the air inlet and outlet are connected to the bottom of the block through the gap, the liquid filling port passes through the lower surface of the block, and a liquid filling head is installed on the lower surface of the block.

[0006] In a feasible implementation, the liquid injection cup further comprises an upper cover plate, the upper cover plate is sealed and connected to the upper port of the cup body, and the air inlet and outlet and the liquid injection port are arranged on the upper cover plate;

[0007] The liquid injection cup further comprises a lower cover plate, which is sealedly connected to the lower port of the cup body, and a liquid outlet is arranged on the lower cover plate.

[0008] In a feasible implementation, the stopper is in the shape of a truncated cone.

[0009] In a feasible implementation, the inner wall of the cup body is provided with a sleeve cup and is fixedly connected to the sleeve cup.

[0010] In a feasible implementation, the liquid injection nozzle is connected to the liquid injection cup through a pipeline, and an elastic component is arranged on the outer peripheral wall thereof;

[0011] The upper part of the injection nozzle is connected to the liquid outlet through a pipeline, and the lower part of the injection nozzle is provided with a sealing ring, so that after the lower part of the injection nozzle is pushed into the injection port on the battery shell, it is sealed with the battery shell through the sealing ring.

[0012] In a feasible implementation, the elastic component is a spring.

[0013] In a feasible implementation, the injection port is connected to the external electrolyte via a first valve, and the first valve controls the connection and closing between the injection port and the external electrolyte;

[0014] The liquid injection cup is connected to the liquid injection nozzle through a second valve, and the second valve controls the connection and closing between the liquid injection cup and the liquid injection nozzle.

[0015] In a feasible implementation, an electrolyte storage box is provided above the injection cup, injection ports of at least two of the injection cups are connected to the bottom of the electrolyte storage box, and the top of the electrolyte storage box is connected to external electrolyte.

[0016] In a feasible implementation, the battery filling device further includes a reference plate, the filling nozzle passes through and is fixed on the reference plate, and a plurality of positioning pins for positioning the battery are provided on the lower surface of the reference plate.

[0017] In a feasible implementation, the battery liquid filling device further includes an air suction nozzle, an air pipe and a third valve, one end of the air pipe is connected to an external air extraction device through the third valve, the other end of the air pipe is connected to the air suction nozzle, and the third valve controls the connection and closing of the battery and the external air extraction device;

[0018] The suction nozzle passes through and is fixed on the reference plate, an elastic component is arranged on the outer peripheral wall of the suction nozzle, and a sealing ring is provided at the lower part of the suction nozzle so that after the lower part of the suction nozzle is pushed into the suction port on the battery shell, it is sealed with the battery shell through the sealing ring.

[0019] Accordingly, the second aspect of the present invention further provides a liquid injection method, using the battery liquid injection device described in the first aspect, the liquid injection method comprising:

[0020] Step 1: transport the external electrolyte to the electrolyte storage box, open the first valve, transport the electrolyte in the electrolyte storage box to the injection cup, so that the electrolyte capacity stored in the injection cup reaches the first preset value, and then close the first valve; at the same time, push the injection nozzle into the injection port on the battery shell, push the suction nozzle into the exhaust port on the battery shell, and open the third valve, and evacuate the battery shell through the air pipe connected to the suction nozzle, so that the air pressure in the battery shell reaches the second preset value;

[0021] Step 2: Open the second valve to allow the electrolyte in the cup to be injected into the battery shell through the injection nozzle, and at the same time apply a positive pressure to the cup through the air inlet and outlet to accelerate the injection of the electrolyte into the battery shell;

[0022] Step 3: While performing step 2, open the third valve and evacuate the battery shell at least twice through the air pipe connected to the liquid injection nozzle to make the air pressure in the battery shell reach a third preset value.

[0023] The implementation of the present invention has the following beneficial effects:

[0024] The present invention discloses a battery liquid filling device and a liquid filling method. A stopper is arranged in a liquid filling cup to separate a liquid filling port and an air inlet and outlet, so as to prevent electrolyte from being sucked back into the air inlet and outlet, causing problems such as inaccurate liquid filling accuracy and residual electrolyte in the air inlet and outlet. At the same time, an elastic component is arranged on the outer peripheral wall of the liquid filling nozzle to avoid direct collision between the liquid filling nozzle and the battery liquid filling port when they contact. The elastic component buffers the resistance of the collision to avoid damage to the battery.

[0025] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application, and do not constitute an improper limitation on the present application.

[0027] Figure 1 is an exploded schematic diagram of a liquid injection cup provided in an embodiment of the present invention;

[0028] Figure 2 is a cross-sectional view of a liquid injection nozzle provided in an embodiment of the present invention;

[0029] Figure 3 is a schematic structural diagram of a liquid injection mechanism provided in an embodiment of the present invention;

[0030] Figure 4 is a partial schematic diagram of a liquid injection mechanism provided in an embodiment of the present invention;

[0031] Figure 5It is a partial structural schematic diagram of a liquid injection mechanism provided in an embodiment of the present invention;

[0032] Figure 6 It is a partial structural schematic diagram of a liquid injection mechanism provided in an embodiment of the present invention;

[0033] Figure 7 It is a partial structural schematic diagram of a liquid injection mechanism provided in an embodiment of the present invention;

[0034] Figure 8 It is a schematic diagram of the partial structure of the liquid injection nozzle provided in an embodiment of the present invention.

[0035] Reference numerals in the figures:

[0036] 1-liquid injection cup, 10-cup body, 11-stopper, 12-upper cover, 13-inlet and outlet, 14-liquid injection port, 141-liquid injection head, 15-liquid outlet, 16-cup sleeve, 17-lower cover;

[0037] 2-liquid injection nozzle, 21-elastic component, 22-sealing ring, 23-air suction nozzle;

[0038] 31-first valve, 32-second valve, 33-third valve;

[0039] 4-Electrolyte storage tank;

[0040] 5-reference plate, 51-positioning pin;

[0041] 6-Trachea. DETAILED DESCRIPTION

[0042] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0043] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0045] Reference Figure 1-8 As shown, the present invention provides a battery filling device, which includes a filling mechanism, and a plurality of the filling mechanisms are provided, and the plurality of filling mechanisms are arranged in multiple rows in the horizontal direction to meet the requirements of simultaneously filling multiple groups of batteries, and at the same time, compared with the filling mechanisms arranged in a single row or a circumference, the efficiency of battery filling can be increased by arranging the filling mechanisms in multiple rows in the horizontal direction. The filling mechanism includes a filling nozzle 2 and a filling cup 1 for storing electrolyte, and the electrolyte in the filling cup 1 is injected into the battery shell through the filling nozzle 2 to complete the battery filling process.

[0046] Specifically:

[0047] Filling cup 1, see Figure 1 As shown, it includes a cup body 10, a block 11, a liquid injection port 14 and an air inlet and outlet 13, the liquid injection port 14 and the air inlet and outlet 13 are arranged at the top of the liquid injection cup 1, the cup body 10 has a cylindrical hollow structure, the top of the block 11 is fixed on the inner top surface of the cup body 10, and a gap is provided between the bottom edge of the block 11 and the inner wall of the cup body 10, the gap mentioned here needs to be provided for air flow to pass through, in an optional implementation, the length of the gap can be set to 1mm; wherein the air inlet and outlet 13 is located above the block 11, the air inlet and outlet 13 is connected to the bottom of the block 11 through the gap, the liquid injection port 14 passes through the lower surface of the block 11, and the liquid injection head 14 is installed on the lower surface of the block 11, thereby separating the liquid injection port 14 and the air inlet and outlet 13, so as to prevent the electrolyte from being sucked back into the air inlet and outlet 13, resulting in inaccurate liquid injection accuracy and residual electrolyte in the air inlet and outlet 13.

[0048] In one possible implementation, refer to Figure 1 As shown, the liquid filling cup 1 also includes an upper cover plate 12, which is sealed and connected to the upper port of the cup body 10, and the air inlet and outlet 13 and the liquid filling port 14 are arranged on the upper cover plate 12; in addition, the liquid filling cup 1 also includes a lower cover plate 17, which is sealed and connected to the lower port of the cup body 10, and the lower cover plate 17 is provided with a liquid outlet 15; by arranging the air inlet and outlet 13, the liquid filling port 14 and the liquid outlet 15 on the cover plate, it is avoided to open holes on the liquid filling cup 1, and the sealing of the liquid filling cup 1 is improved; the upper cover plate 12 and the lower cover plate 17 are snap-fitted to the liquid filling cup 1, or are fixed by screw thread rotation. Of course, the specific connection method includes but is not limited to this, as long as the sealing of the upper cover plate 12 and the lower cover plate 17 and the liquid filling cup 1 can be guaranteed.

[0049] Preferably, refer to Figure 1 As shown, the stopper 11 is truncated cone-shaped and matches the shape of the cup body 10. Of course, the stopper 11 can also be any other suitable shape, as long as there is a gap between the stopper 11 and the cup body 10 for airflow to pass through, and the gap can block the electrolyte below the stopper 11.

[0050] In one possible implementation, refer to Figure 1 As shown, the inner wall of the cup body 10 is provided with a sleeve cup 16, and the surface of the sleeve cup 16 is a smooth surface to reduce the electrolyte from sticking to the inner wall of the cup body 10, causing insufficient liquid injection in the battery. Preferably, the sleeve cup 16 is made of stainless steel, and the surface of stainless steel is not only smooth, but also corrosion-resistant, which can avoid the erosion of the electrolyte and increase the service life of the injection cup 1, wherein the cup body 10 is fixedly connected to the sleeve cup 16, and the fixed connection mentioned here is that the sleeve cup 16 is bonded to the inner wall of the cup body 10. Of course, the sleeve cup 16 and the cup body 10 can also be integrally formed, that is, the material of the cup body 10 is stainless steel, and there is no limitation here, as long as the inner wall of the cup body 10 through which the electrolyte flows is smooth and mirror-like and corrosion-resistant.

[0051] In one possible implementation, refer to Figure 2-6 As shown, the liquid injection nozzle 2 is connected to the liquid injection cup 1 through a pipeline, and an elastic component 21 is arranged on the outer wall thereof to avoid direct collision between the liquid injection nozzle 2 and the battery liquid injection port when they come into contact. The elastic component 21 buffers the resistance of the collision to avoid damage to the battery. Preferably, the elastic component 21 is a spring. Of course, the elastic component 21 can also be other components as long as it can play a shock-absorbing and buffering role.

[0052] In addition, the upper part of the injection nozzle 2 is connected to the liquid outlet 15 through a pipeline, and a sealing ring 22 is provided at the lower part of the injection nozzle 2, so that after the lower part of the injection nozzle 2 is pushed into the injection port 14 on the battery shell, it is sealed with the battery shell through the sealing ring 22 to prevent external gas from flowing into the battery and affecting the injection effect.

[0053] In one possible implementation, refer to Figure 1 and Figure 5-6 As shown, the liquid injection port 14 is connected to the external electrolyte through the first valve 31, and the first valve 31 controls the connection and closing between the liquid injection port 14 and the external electrolyte; the liquid injection cup 1 is connected to the liquid injection nozzle 2 through the second valve 32, and the second valve 32 controls the connection and closing between the liquid injection cup 1 and the liquid injection nozzle 2. It should be pointed out that the above-mentioned first valve 31 and second valve 32 are standard parts, which play the role of connection and closing. The specific structures are all existing technologies and are not limited here.

[0054] In one possible implementation, an electrolyte storage box 4 is provided above the injection cup 1, the injection ports 14 of at least two injection cups 1 are connected to the bottom of the electrolyte storage box 4, and the top of the electrolyte storage box 4 is connected to the external electrolyte. Specifically, refer to Figure 3 As shown, the injection ports 14 of the three injection cups 1 are connected to the bottom of the electrolyte storage box 4. By adding the electrolyte storage box 4, the injection cups 1 can be prevented from being connected to the external electrolyte, which can make the structure simpler.

[0055] In one possible implementation, refer to Figure 7 As shown, the battery filling device also includes a reference plate 5, through which the filling nozzle 2 passes and is fixed, and a plurality of positioning pins 51 for positioning the battery are provided on the lower surface of the reference plate 5 to determine whether the battery under the filling nozzle 2 is in a preset position.

[0056] In one possible implementation, refer to Figure 5-8 As shown, the battery filling equipment also includes an air suction nozzle 23, an air pipe 6 and a third valve 33. One end of the air pipe 6 is connected to an external air extraction device through the third valve 33, and the other end of the air pipe 6 is connected to the air suction nozzle 23. The third valve 33 controls the connection and closing of the battery and the external air extraction device to reduce the density of air in the electrolyte and improve the yield rate of the product.

[0057] In addition, the suction nozzle 23 passes through and is fixed on the reference plate 5, and an elastic component 21 is arranged on the outer peripheral wall of the suction nozzle 23 to prevent direct collision between the injection nozzle 2 and the battery injection port when they come into contact. The elastic component 21 buffers the resistance of the collision to avoid damage to the battery. In addition, a sealing ring 22 is provided at the lower part of the suction nozzle 23, so that after the lower part of the suction nozzle 23 is pushed into the suction port on the battery shell, it is sealed with the battery shell through the sealing ring 22 to prevent external gas from flowing into the battery and affecting the suction effect.

[0058] The present invention provides a battery liquid filling device, which arranges a stopper 11 in a liquid filling cup 1 to separate a liquid filling port 14 from an air inlet and outlet 13, so as to prevent electrolyte from being sucked back into the air inlet and outlet 13, thereby causing problems such as inaccurate liquid filling accuracy and residual electrolyte in the air inlet and outlet 13. At the same time, an elastic component 21 is arranged on the outer peripheral wall of the liquid filling nozzle 2 to avoid direct collision between the liquid filling nozzle 2 and the battery liquid filling port when they contact. The elastic component 21 buffers the resistance of the collision to avoid damage to the battery.

[0059] The present invention also provides a liquid injection method, using the above battery liquid injection device, the liquid injection method comprises:

[0060] Step 1: transport the external electrolyte to the electrolyte storage box 4, open the first valve 31, transport the electrolyte in the electrolyte storage box 4 to the injection cup 1, so that the electrolyte capacity stored in the injection cup 1 reaches the first preset value, and then close the first valve 31; at the same time, push the injection nozzle 2 into the injection port 14 on the battery shell, push the suction nozzle 23 into the exhaust port on the battery shell, and open the third valve 33, and evacuate the battery shell through the air pipe 6 connected to the suction nozzle 23, so that the air pressure in the battery shell reaches the second preset value;

[0061] Step 2: Open the second valve 32 to allow the electrolyte in the cup body 10 to be injected into the battery shell through the injection nozzle 2, and at the same time, a positive pressure is applied to the cup body 10 through the air inlet and outlet 13 to accelerate the injection of the electrolyte into the battery shell;

[0062] Step 3: While performing step 2, open the third valve 33 and evacuate the battery shell at least twice through the air pipe 6 connected to the injection nozzle 2 so that the air pressure in the battery shell reaches a third preset value.

[0063] It should be pointed out that the above-mentioned injection method is only one possible way to achieve it. The specific injection method includes but is not limited to the following: In addition, the purpose of the vacuum nozzle 23 to evacuate the battery is to reduce the air in the battery, and the negative pressure is also to speed up the injection of the electrolyte; the purpose of the inlet and outlet 13 to apply positive pressure to the injection cup 1 is to squeeze the electrode liquid in the injection cup 1 out of the injection cup 1, which of course will also cause the boiling of the electrolyte in the electrolyte cup. By setting a block 11, the injection port 14 and the inlet and outlet 13 are separated to prevent the electrolyte from being sucked back into the inlet and outlet 13, resulting in inaccurate injection accuracy and residual electrolyte in the inlet and outlet 13; finally, while injecting the liquid, it is also necessary to evacuate the battery shell at least twice in combination with product and process requirements to discharge the air brought in by the electrolyte.

[0064] The present invention provides a liquid injection method, wherein a stopper 11 is arranged in a liquid injection cup 1 to separate a liquid injection port 14 from an air inlet and outlet 13, so as to prevent electrolyte from being sucked back into the air inlet and outlet 13, thereby causing problems such as inaccurate liquid injection accuracy and residual electrolyte in the air inlet and outlet 13. At the same time, an elastic component 21 is arranged on the outer peripheral wall of the liquid injection nozzle 2 to avoid direct collision between the liquid injection nozzle 2 and the battery liquid injection port when they contact each other. The elastic component 21 buffers the resistance of the collision to avoid damage to the battery.

[0065] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A battery filling device, characterized in that: The battery injection device comprises an injection mechanism, wherein a plurality of the injection mechanisms are provided, and the plurality of the injection mechanisms are arranged in a plurality of rows in a horizontal direction, and the injection mechanism comprises an injection nozzle (2) and an injection cup (1) for storing electrolyte, and the electrolyte in the injection cup (1) is injected into the battery shell through the injection nozzle (2); wherein: A liquid injection cup (1), comprising a cup body (10), a block (11), a liquid injection port (14) and an air inlet and outlet (13), wherein the liquid injection port (14) and the air inlet and outlet (13) are arranged at the top of the liquid injection cup (1), the cup body (10) has a cylindrical hollow structure, the top of the block (11) is fixed on the inner top surface of the cup body (10), a gap is provided between the bottom edge of the block (11) and the inner wall of the cup body (10), wherein the air inlet and outlet (13) is located above the block (11), the air inlet and outlet (13) is connected to the bottom of the block (11) through the gap, the liquid injection port (14) passes through the lower surface of the block (11), and a liquid injection head (141) is installed on the lower surface of the block (11); The liquid injection cup (1) further comprises an upper cover plate (12), the upper cover plate (12) being sealedly connected to the upper end of the cup body (10), and the air inlet and outlet ports (13) and the liquid injection port (14) being arranged on the upper cover plate (12); The liquid injection cup (1) further comprises a lower cover plate (17), wherein the lower cover plate (17) is sealedly connected to the lower end of the cup body (10), and a liquid outlet (15) is provided on the lower cover plate (17); The liquid injection nozzle (2) is connected to the liquid injection cup (1) via a pipeline, and an elastic component (21) is arranged on its outer peripheral wall; The upper part of the liquid injection nozzle (2) is connected to the liquid outlet (15) via a pipeline, and the lower part of the liquid injection nozzle (2) is provided with a sealing ring (22), so that after the lower part of the liquid injection nozzle (2) is pushed into the liquid injection port on the battery shell, it is sealed with the battery shell through the sealing ring (22); and / or The elastic component (21) is a spring.

2. The battery filling device according to claim 1, characterized in that: The stopper (11) is in the shape of a truncated cone.

3. The battery filling device according to claim 1, characterized in that: The inner wall of the cup body (10) is provided with a sleeve cup (16) and is fixedly connected to the sleeve cup (16).

4. The battery filling device according to claim 1, characterized in that: The injection port (14) is connected to an external electrolyte via a first valve (31), and the first valve (31) controls the connection and closing between the injection port (14) and the external electrolyte; The liquid injection cup (1) is connected to the liquid injection nozzle (2) via a second valve (32), and the second valve (32) controls the connection and closing between the liquid injection cup (1) and the liquid injection nozzle (2).

5. The battery filling device according to claim 4, characterized in that: An electrolyte storage box (4) is provided above the injection cup (1), the injection ports (14) of at least two of the injection cups (1) are connected to the bottom of the electrolyte storage box (4), and the top of the electrolyte storage box (4) is connected to external electrolyte.

6. The battery filling device according to claim 1, characterized in that: The battery liquid injection device also includes a reference plate (5), the liquid injection nozzle (2) passes through and is fixed on the reference plate (5), and the lower surface of the reference plate (5) is provided with a plurality of positioning pins (51) for positioning the battery.

7. The battery filling device according to claim 6, characterized in that: The battery liquid injection device further comprises an air suction nozzle (23), an air pipe (6) and a third valve (33), one end of the air pipe (6) is connected to an external air extraction device through the third valve (33), the other end of the air pipe (6) is connected to the air suction nozzle (23), and the third valve (33) controls the connection and closing of the battery and the external air extraction device; The air suction nozzle (23) passes through and is fixed on the reference plate (5); an elastic component (21) is arranged on the outer peripheral wall of the air suction nozzle (23); a sealing ring (22) is provided at the lower part of the air suction nozzle (23), so that after the lower part of the air suction nozzle (23) is pushed into the air suction port on the battery shell, it is sealed with the battery shell through the sealing ring (22).

8. A liquid injection method, characterized in that: Using the battery liquid injection device according to any one of claims 1 to 7, the liquid injection method comprises: Step 1: transporting external electrolyte to the electrolyte storage box (4), and opening the first valve (31), transporting the electrolyte in the electrolyte storage box (4) to the injection cup (1), so that the electrolyte capacity stored in the injection cup (1) reaches a first preset value, and then closing the first valve (31); at the same time, pushing the injection nozzle (2) into the injection port on the battery shell, pushing the air suction nozzle (23) into the exhaust port on the battery shell, and opening the third valve (33), and evacuating the battery shell through the air pipe (6) connected to the air suction nozzle (23), so that the air pressure in the battery shell reaches a second preset value; Step 2: Open the second valve (32) to allow the electrolyte in the cup body (10) to be injected into the battery shell through the injection nozzle (2), and at the same time, apply a positive pressure to the cup body (10) through the air inlet (13) to accelerate the injection of the electrolyte into the battery shell; Step 3: While carrying out step 2, open the third valve (33) and evacuate the battery shell at least twice through the air pipe (6) connected to the injection nozzle (2) so that the air pressure in the battery shell reaches a third preset value.

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