Liquid injection device

Abstract

The utility model provides a liquid injection device, which is used for injecting electrolyte into a battery body and comprises a liquid injection box, a liquid storage tank, a liquid storage tank and a liquid storage tank, the filling assembly is used for filling electrolyte into the battery body; the vacuum assembly is used for pumping out air in the liquid injection space to enable the liquid injection space to have a preset vacuum degree; the temperature control assembly is configured to adjust the temperature of the liquid injection space to a preset temperature value; wherein the vacuum assembly is communicated with the liquid injection space, and the temperature control assembly is combined to the liquid injection box. According to the embodiment of the utility model, the temperature in the electrolyte injection space is adjusted to the preset temperature value through the temperature control assembly, so that the viscosity of the electrolyte is reduced, the electrolyte is enabled to flow and permeate into each part of the battery body more easily, the electrolyte injection efficiency is improved, the contact time of the electrolyte and residual air in the electrolyte injection space is further reduced, and the service life of the battery is prolonged. And the electrolyte is prevented from absorbing moisture in residual air and losing efficacy, so that the processing quality of the battery is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery processing technology, specifically to a liquid injection device. Background Technology

[0002] A lithium-ion battery consists of a battery body and an electrolyte. The battery body includes a positive electrode, a negative electrode, and a separator. The positive and negative electrodes are immersed in the electrolyte. Lithium ions move between the positive and negative electrodes using the electrolyte as a medium to achieve charging and discharging of the battery.

[0003] In related technologies, electrolyte injection into the battery body is carried out in a vacuum container. However, in product processing, an absolute vacuum environment is generally not created, but only the gas rarefaction is reduced. Because the electrolyte injection process has a long penetration time, the electrolyte is prone to absorbing moisture from the remaining air in the vacuum container and becoming ineffective, which affects the processing quality of the battery. Utility Model Content

[0004] The present invention provides a liquid injection device that can improve the technical problem that the electrolyte is prone to failure during the liquid injection process, thus affecting the battery processing quality.

[0005] An embodiment of this utility model provides a liquid injection device for adding electrolyte to a battery body, the liquid injection device comprising:

[0006] The liquid filling tank has a liquid filling space for placing the battery body;

[0007] A filling assembly for filling the battery body with electrolyte;

[0008] A vacuum assembly is used to extract air from the injection space to achieve a preset vacuum level in the injection space; and

[0009] The temperature control component is configured to adjust the temperature of the injection space to a preset temperature value;

[0010] The vacuum component is connected to the liquid injection space, and the temperature control component is integrated into the liquid injection tank.

[0011] Optionally, in some embodiments of this application, the temperature control component includes:

[0012] A heater for heating the injection space; and

[0013] A temperature sensor is used to detect the temperature within the injection space;

[0014] The heater is disposed on the inner wall of the injection tank, and the temperature sensor is fixedly connected to the injection tank.

[0015] Optionally, in some embodiments of this application, the vacuum assembly further includes:

[0016] A vacuum pump is used to extract air from the injection space; and

[0017] A vacuum valve is used to control the connection between the vacuum pump and the liquid injection space;

[0018] The vacuum valve is connected between the vacuum pump and the liquid injection tank.

[0019] Optionally, in some embodiments of this application, the vacuum assembly further includes:

[0020] A vent valve is used to release air into the injection space;

[0021] The venting valve is connected to the injection space.

[0022] Optionally, in some embodiments of this application, the venting valve is connected between the vacuum valve and the injection tank.

[0023] Optionally, in some embodiments of this application, the dispensing component includes:

[0024] A liquid storage container used to store electrolyte;

[0025] An injection valve, connected to the storage container, is used to quantitatively control the output of electrolyte from the storage container; and

[0026] A filling tube is used to guide the electrolyte output from the filling valve to the battery body;

[0027] The injection tank is also provided with an injection port that communicates with the injection space. One end of the injection pipe is connected to the injection valve, and the other end passes through the injection port into the injection space.

[0028] Optionally, in some embodiments of this application, the injection device further includes:

[0029] A cover plate is provided on the filling port to form a sealed connection between the filling tank and the filling pipe;

[0030] The cover plate is fixedly connected to the injection tank.

[0031] Optionally, in some embodiments of this application, the injection device further includes:

[0032] A clamping member, movably connected to the injection tank, is configured to have a first position and a second position; and

[0033] A prime mover is used to drive the clamping member to move between the first position and the second position; wherein, when the clamping member is in the first position, the clamping member confines the battery body to a preset area of ​​the liquid injection space;

[0034] When the clamping member is in the second position, the clamping member releases its constraint on the battery body.

[0035] Optionally, in some embodiments of this application, the injection device further includes:

[0036] An adjustment assembly is connected between the prime mover and the clamping member to form a power transmission mechanism.

[0037] Optionally, in some embodiments of this application, the adjustment component further includes:

[0038] A lead screw is rotatably connected to the housing and rotates about a central axis under the drive of the prime mover;

[0039] A slider, threadedly connected to the lead screw, is axially movable along the central axis as the lead screw rotates; and

[0040] The slider is slidably connected to the slide rail.

[0041] The clamping member is fixedly connected to the slider so that the clamping member can apply a force to the battery body under the drive of the slider.

[0042] Optionally, in some embodiments of this application, the injection tank includes:

[0043] The housing includes the injection space and a receiving port communicating with the injection space; and

[0044] An opening / closing component is movably connected to the housing, such that the opening / closing component has a first state and a second state relative to the housing;

[0045] When the opening and closing component is in the first state, the opening and closing component covers the material inlet;

[0046] When the opening / closing component is in the first state, the opening / closing component exposes the material inlet.

[0047] The beneficial effects of the embodiments of this utility model are as follows:

[0048] In embodiments of this invention, the injection space is equipped with a vacuum component to achieve a preset vacuum level, and the temperature in the injection space is adjusted to a preset temperature value by a temperature control component. This reduces the viscosity of the electrolyte, making it easier for the electrolyte to flow and penetrate into various parts of the battery body, thereby improving the injection efficiency. This also reduces the contact time between the electrolyte and residual air in the injection space, preventing the electrolyte from absorbing moisture from the residual air and failing, thus improving the battery's processing quality. Attached Figure Description

[0049] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 This is a three-dimensional schematic diagram of the liquid injection device provided in an embodiment of this utility model;

[0051] Figure 2 This is a three-dimensional schematic diagram of the liquid injection device provided in an embodiment of the present invention from another perspective;

[0052] Figure 3 yes Figure 2 Enlarged view of section A;

[0053] Figure 4 yes Figure 2 Enlarged view of section B;

[0054] Figure 5 This is a three-dimensional schematic diagram of a portion of the liquid injection device provided in an embodiment of this utility model;

[0055] Figure 6 yes Figure 5 Enlarged view of section C.

[0056] Figure label:

[0057] 100. Liquid injection device;

[0058] 110. Injection tank; 111. Tank body; 111a. Injection space; 111b. Injection port; 111c. Discharge port; 112. Opening / closing component; 112a. Observation window;

[0059] 120. Filling assembly; 121. Liquid storage container; 121a. Graduation mark; 122. Filling valve; 123. Connecting pipe; 124. Filling pipe;

[0060] 130. Vacuum assembly; 131. Vacuum pump; 132. Vacuum valve; 133. Vacuum piping; 134. Vent valve;

[0061] 140. Temperature control unit; 141. Heater; 142. Temperature controller; 142a. Display screen; 142b. Button;

[0062] 151. Base; 152. Fixing seat; 153. Limiting rod; 154. Suction cup; 155. Mounting plate; 156. Column; 157. Cover plate; 158. Support leg;

[0063] 160. Snap-fit ​​structure; 161. Snap-fit ​​socket; 162. Snap-fit ​​component;

[0064] 171. Clamping component; 172. Prime mover;

[0065] 170a. Adjustment component; 173. Lead screw; 174. Slider; 175. Slide rail;

[0066] C1, Central axis;

[0067] 200. Battery body. Detailed Implementation

[0068] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0069] Reference Figure 1 , Figure 2 and Figure 5 This application provides an electrolyte injection device 100 for injecting electrolyte into a battery body 200. The electrolyte injection device 100 includes an electrolyte injection tank 110, an injection assembly 120, a vacuum assembly 130, and a temperature control assembly 140.

[0070] The electrolyte filling tank 110 has an electrolyte filling space 111a for placing the battery body 200. The filling assembly 120 is used to fill the battery body 200 with electrolyte. The vacuum assembly 130 is in communication with the electrolyte filling space 111a and is used to extract air from the electrolyte filling space 111a to give the electrolyte filling space 111a a preset vacuum degree, which can be determined according to the actual processing conditions.

[0071] Temperature control component 140 is integrated into injection tank 110, and temperature control component 140 is configured to adjust the temperature of injection space 111a to a preset temperature value, which can be determined according to the selection of electrolyte so that the electrolyte has a suitable viscosity.

[0072] By adopting the above technical solution, the vacuum component 130 is set to give the injection space 111a a preset vacuum degree, and the temperature in the injection space 111a is adjusted to a preset temperature value by the temperature control component 140. This reduces the viscosity of the electrolyte, making it easier to flow and penetrate into various parts of the battery body 200, improving the injection efficiency. This also reduces the contact time between the electrolyte and the residual air in the injection space 111a, preventing the electrolyte from absorbing moisture from the residual air and failing, thereby improving the battery processing quality and increasing the battery's safety and service life.

[0073] In a specific embodiment of this application, the vacuum assembly 130 and the liquid injection tank 110 can be connected by a pipeline, or they can be directly connected; there is no limitation on this.

[0074] In a specific embodiment of this application, the temperature control component 140 can be an electric heating component (e.g., resistance heating or infrared heating), or it can be a liquid heating component. The temperature control component 140 can be disposed within the liquid injection space 111a, or it can be disposed in the interlayer of the liquid injection tank 110, and there is no limitation on this.

[0075] In some embodiments, refer to Figure 5 The temperature control component 140 includes a heater 141 and a temperature sensor (not shown). The heater 141 is disposed on the inner wall of the filling tank 110 and is used to heat the filling space 111a, thereby heating the battery body 200, so that both the filling space 111a and the battery body 200 are at a preset temperature value. The temperature sensor is fixedly connected to the filling tank 110 and is used to detect the temperature inside the filling space 111a.

[0076] With this approach, the operation of the heater 141 is controlled by the signal feedback from the temperature sensor, thereby precisely regulating the temperature of the injection space 111a.

[0077] In some embodiments, the liquid injection device 100 further includes a controller (not shown) for controlling the power of the heater 141 based on a temperature signal from a temperature sensor. Specifically, the controller includes an MCU.

[0078] In a specific embodiment of this application, reference is made to Figure 1 , Figure 2 and Figure 5The heater 141 uses a heating tube, which is arranged on the inner wall of the housing 111. The liquid injection device 100 also includes a temperature controller 142. The temperature controller 142 is located in the housing 111 and includes a display screen 142a and a button 142b. The display screen 142a is used to display operating parameters, such as the temperature value detected by the temperature sensor and the vacuum level, while the button 142b is used for the user to input control commands. More specifically, the temperature sensor is integrated inside the temperature controller 142.

[0079] In some embodiments, refer to Figures 1 to 3 The vacuum assembly 130 also includes a vacuum pump 131 and a vacuum valve 132. The vacuum pump 131 is used to extract air from the injection space 111a; the vacuum valve 132 is connected between the vacuum pump 131 and the injection tank 110, and is used to control the connection between the vacuum pump 131 and the injection space 111a, and can also adjust the gas flow rate.

[0080] In this design, the air in the electrolyte filling tank 110 is extracted by the vacuum pump 131 to create a vacuum environment. Under vacuum conditions, the electrolyte is more easily drawn into the battery body 200. During this process, the vacuum valve 132 is opened to connect the vacuum pump 131 with the electrolyte filling space 111a. The air pressure in the electrolyte filling space 111a gradually decreases until a preset vacuum level is reached. At this point, the vacuum valve 132 closes to disconnect the vacuum pump 131 from the electrolyte filling space 111a.

[0081] In a specific embodiment of this application, reference is made to Figures 1 to 3 The vacuum assembly 130 also includes a vacuum line 133. The vacuum pump 131 is connected to the liquid injection tank 110 through the vacuum line 133, which facilitates the relative positioning of the vacuum pump 131 and the liquid injection tank 110.

[0082] In some embodiments, refer to Figure 1 and Figure 2 The liquid injection device 100 also includes a base 151. The vacuum pump 131 and the liquid injection tank 110 are respectively mounted on the base 151. The bottom of the base 151 is also provided with multiple support legs 158 to improve the overall stability.

[0083] The liquid injection device 100 also includes a fixed base 152, multiple limiting rods 153, and a suction cup 154. The vacuum pump 131 is connected to the vacuum pipeline 133. At least two fixed bases 152 are provided in the height direction and are respectively connected to the vacuum pump 131. Multiple limiting rods 153 are supported between two fixed bases 152. The bottom of each fixed base 152 is connected to a suction cup 154, which adheres to the top of the base 151. The cooperation of the base 151 and the limiting rods 153 supports the vacuum pump 131, improving its stability. Simultaneously, the suction cup 154 ​​facilitates the installation of the vacuum pump 131 on the base 151.

[0084] In some embodiments, refer to Figures 1 to 3 The vacuum assembly 130 also includes a vent valve 134. The vent valve 134 is connected to the liquid injection space 111a and is used to vent gas into the liquid injection space 111a.

[0085] With this approach, the venting valve 134 is used to release gas into the vacuum oven after the liquid injection is completed, thereby removing the vacuum environment in the liquid injection space 111a and making it easier to remove the battery body 200 from the liquid injection tank 110.

[0086] In a specific embodiment of this application, the venting valve 134 and the vacuum valve 132 are connected to the vacuum pump 131 through the same pipeline. Of course, the venting valve 134 can also be directly connected to the liquid injection space 111a through different pipelines.

[0087] In some embodiments, refer to Figures 1 to 3 The vent valve 134 is connected between the vacuum valve 132 and the liquid injection tank 110. This design provides dual protection between the vent valve 134 and the vacuum valve 132, preventing leakage caused by the failure of either valve, while also simplifying the piping setup.

[0088] In a specific embodiment of this application, reference is made to Figures 1 to 3 Vacuum valve 132 and vent valve 134 are respectively connected to vacuum line 133.

[0089] In some embodiments, refer to Figure 1 , Figure 2 and Figure 4 The filling assembly 120 includes: a liquid storage container 121, a liquid filling valve 122, and a filling pipe 124.

[0090] The storage container 121 is used to store electrolyte; the injection valve 122 is connected to the storage container 121 to quantitatively control the output of electrolyte from the storage container 121. Specifically, the injection valve 122 can be a solenoid valve, which can be connected to the storage container 121 through the connecting pipe 123, or the injection valve 122 can be directly connected to the storage container 121.

[0091] The filling tube 124 is used to guide the electrolyte output from the filling valve 122 to the battery body 200; the filling tank 110 is also provided with a filling port 111b that communicates with the filling space 111a. One end of the filling tube 124 is connected to the filling valve 122, and the other end passes through the filling port 111b into the filling space 111a.

[0092] With this solution, the injection volume can be accurately quantified through the injection valve 122, avoiding the problem of injecting too much or too little liquid.

[0093] In some embodiments, refer toFigure 2 The liquid storage container 121 is made of transparent material, and the side wall of the liquid storage container 121 is provided with scale lines 121a. By observing the scale lines 121a, the liquid injection valve 122 can be closed at any time to complete the quantitative liquid injection; or, the filling component 120 also includes a flow sensor. By combining the flow value detected by the flow sensor with the opening degree and opening time of the liquid injection valve 122, the liquid injection volume can be obtained to achieve quantitative liquid injection.

[0094] In a specific embodiment of this application, reference is made to Figure 2 , Figure 4 and Figure 5 The liquid storage container 121 is positioned above the filling port 111b, reducing the bends in the filling pipe 124 and facilitating the transfer of electrolyte. The liquid injection device 100 also includes a mounting plate 155 and multiple columns 156; the liquid storage container 121 is fixedly mounted on the mounting plate 155, one end of each column 156 is fixedly connected to the mounting plate 155, and the other end is fixedly connected to the base 151, thus providing support for the mounting plate 155.

[0095] It should be noted that the position of column 156 can be set according to actual design requirements to avoid interference with other moving parts.

[0096] In some embodiments, refer to Figure 2 and Figure 4 The injection device 100 also includes a cover plate 157. The cover plate 157 is disposed on the injection port 111b to form a sealed connection between the injection tank 110 and the injection pipe 124; and the cover plate 157 is fixedly connected to the injection tank 110.

[0097] By adopting this solution, the cover plate 157 is used to prevent external gas from entering the interior of the vacuum oven through the filling port 111b.

[0098] In some embodiments, refer to Figure 4 The cover plate 157 is connected to the liquid filling tank 110 via a snap-fit ​​structure 160, which facilitates the removal of the cover plate 157. More specifically, the snap-fit ​​structure 160 adopts an existing latch, which includes at least a latch 161 fixedly connected to the tank body 111 and a latch 162 abutting against the cover plate 157.

[0099] In some embodiments, refer to Figure 5 and Figure 6 The liquid injection device 100 further includes a clamping member 171 and a prime mover 172. The clamping member 171 is movably connected to the liquid injection tank 110, so that the clamping member 171 has a first position and a second position. The prime mover 172 is used to drive the clamping member 171 to move between the first position and the second position. Specifically, the clamping member 171 can be slidably connected or rotatably connected to the liquid injection tank 110, thereby acting on the battery body 200.

[0100] When the clamp 171 is in the first position, the clamp 171 confines the battery body 200 within a preset area of ​​the liquid filling space 111a, which corresponds to the filling port 111b; when the clamp 171 is in the second position, the clamp 171 releases the confinement of the battery body 200, at which time the battery body 200 can be removed from the liquid filling tank 110.

[0101] This solution uses clamping member 171 to fix and limit the battery body 200, preventing shaking and displacement during the liquid injection process.

[0102] In some embodiments, the prime mover 172 may be an electric motor, hydraulic cylinder, pneumatic cylinder, or electric push rod, etc.

[0103] In some embodiments, the injection device 100 further includes an adjustment assembly 170a. The adjustment assembly 170a is connected between the prime mover 172 and the clamping member 171 to form a power transmission.

[0104] In some embodiments, the prime mover 172 may be an electric motor, and the adjusting component 170a may be a structure that can convert the output torque of the motor into linear motion, such as a gear and rack drive or a lead screw 173 drive.

[0105] In some embodiments, refer to Figure 5 and Figure 6 The adjustment assembly 170a also includes: a lead screw 173, a slider 174, and a slide rail 175.

[0106] A lead screw 173 is rotatably connected to the housing 111 and rotates about a central axis C1 under the drive of a prime mover 172. A slider 174 is threadedly connected to the lead screw 173 to move axially along the central axis C1 when the lead screw 173 rotates. The slider 174 is slidably connected to a slide rail 175, which guides the movement of the slider 174. A clamping member 171 is fixedly connected to the slider 174 so that the clamping member 171 can apply a force to the battery body 200 under the drive of the slider 174.

[0107] With this approach, after the battery body 200 is placed into the liquid injection space 111a, the motor drives the lead screw 173 to rotate. The lead screw 173 drives the slider 174 to slide in the slide rail 175, thereby causing the clamping member 171 to contact and clamp the battery body 200, thus achieving clamping and fixing of the battery body 200.

[0108] In a specific embodiment of this application, reference is made to Figure 5 and Figure 6There are two symmetrical clamping members 171 and two corresponding sliders 174. The sliders 174 correspond one-to-one with the clamping members 171. When the lead screw 173 rotates in the forward direction, the two clamping members 171 move towards each other to clamp the battery body 200.

[0109] In another specific embodiment of this application, only one clamping member 171 may be provided, and a fixing block (not shown) may be provided around the preset area. The fixing block is fixedly connected to the bottom of the liquid injection tank 110, and the clamping member 171 and the fixing block cooperate to clamp the electromagnetic body.

[0110] In some embodiments, the shape of the clamping member 171 may be one of V-shape, arc shape, etc.

[0111] In some embodiments, refer to Figure 1 and Figure 2 The liquid filling tank 110 includes a tank body 111 and an opening / closing member 112. The tank body 111 forms a liquid filling space 111a and a dispensing port 111c communicating with the liquid filling space 111a. The opening / closing member 112 is movably connected to the tank body 111, so that the opening / closing member 112 has a first state and a second state relative to the tank body 111. When the opening / closing member 112 is in the first state, the opening / closing member 112 covers the dispensing port 111c, thereby isolating the liquid filling space 111a from the outside. When the opening / closing member 112 is in the first state, the opening / closing member 112 exposes the dispensing port 111c, which facilitates the insertion of the battery body 200 into the liquid filling space 111a or the removal of the battery body 200 from the liquid filling space 111a.

[0112] With this design, the opening and closing components facilitate the opening and closing of the liquid filling tank 110, thereby allowing the battery body 200 to be placed in or removed.

[0113] In some embodiments, the opening / closing member 112 may be rotatably connected to the housing 111, such as a pivot or hinge, so that the locking member can be opened by rotation; the opening / closing member 112 may also be slidably connected to the housing 111, so that the locking member can be opened by push-pull.

[0114] In some embodiments, refer to Figure 1 The opening and closing component 112 is also provided with an observation window 112a, which is made of transparent material, making it convenient to directly observe the liquid injection situation.

[0115] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A liquid injection device (100) for adding electrolyte to a battery body (200), characterized in that, The liquid injection device (100) includes: The liquid filling tank (110) has a liquid filling space (111a) for placing the battery body (200); A filling assembly (120) is used to fill the battery body (200) with electrolyte; A vacuum assembly (130) is used to extract air from the injection space (111a) to give the injection space (111a) a preset vacuum level; and The temperature control component (140) is configured to adjust the temperature of the injection space (111a) to a preset temperature value; The vacuum component (130) is connected to the liquid injection space (111a), and the temperature control component (140) is connected to the liquid injection tank (110).

2. The liquid injection device (100) according to claim 1, characterized in that, The temperature control component (140) includes: A heater (141) is provided for heating the injection space (111a); and A temperature sensor is used to detect the temperature within the injection space (111a); The heater (141) is disposed on the inner wall of the injection tank (110), and the temperature sensor is fixedly connected to the injection tank (110).

3. The liquid injection device (100) according to claim 1, characterized in that, The vacuum assembly (130) also includes: A vacuum pump (131) is used to extract air from the injection space (111a); and A vacuum valve (132) is used to control the connection between the vacuum pump (131) and the liquid injection space (111a); The vacuum valve (132) is connected between the vacuum pump (131) and the liquid injection tank (110).

4. The liquid injection device (100) according to claim 3, characterized in that, The vacuum assembly (130) also includes: A vent valve (134) is used to vent air into the injection space (111a); The venting valve (134) is connected to the injection space (111a).

5. The liquid injection device (100) according to claim 4, characterized in that, The venting valve (134) is connected between the vacuum valve (132) and the liquid injection tank (110).

6. The liquid injection device (100) according to any one of claims 1 to 5, characterized in that, The dispensing assembly (120) includes: A liquid storage container (121) is used to store electrolyte; An injection valve (122) is connected to the liquid storage container (121) to quantitatively control the output of electrolyte from the liquid storage container (121); and A filling tube (124) is used to guide the electrolyte output from the filling valve (122) to the battery body (200); The injection tank (110) is also provided with an injection port (111b) that communicates with the injection space (111a). One end of the injection pipe (124) is connected to the injection valve (122), and the other end passes through the injection port (111b) and enters the injection space (111a).

7. The liquid injection device (100) according to claim 6, characterized in that, The liquid injection device (100) further includes: A cover plate (157) is provided on the filling port (111b) to form a sealed connection between the filling tank (110) and the filling tube (124); The cover plate (157) is fixedly connected to the injection tank (110).

8. The liquid injection device (100) according to any one of claims 1 to 5, characterized in that, The liquid injection device (100) further includes: A clamping member (171) is movably connected to the injection tank (110) to give the clamping member (171) a first position and a second position; and A prime mover (172) is used to drive the clamping member (171) to move between the first position and the second position; When the clamping member (171) is in the first position, the clamping member (171) limits the battery body (200) to a preset area of ​​the liquid injection space (111a); When the clamping member (171) is in the second position, the clamping member (171) releases the restriction on the battery body (200).

9. The liquid injection device (100) according to claim 8, characterized in that, The liquid injection device (100) further includes: An adjustment assembly (170a) is connected between the prime mover (172) and the clamping member (171) to form a power transmission.

10. The liquid injection device (100) according to claim 9, characterized in that, The adjustment assembly (170a) further includes: The lead screw (173) is rotatably connected to the injection tank (110) and rotates about a central axis (C1) under the drive of the prime mover (172); A slider (174), threadedly connected to the lead screw (173), is axially movable along the central axis (C1) as the lead screw (173) rotates; and The slide rail (175) and the slider (174) are slidably connected; The clamping member (171) is fixedly connected to the slider (174) so ​​that the clamping member (171) can apply force to the battery body (200) under the drive of the slider (174).

11. The liquid injection device (100) according to any one of claims 1 to 5, characterized in that, The injection tank (110) includes: The housing (111) forms the injection space (111a) and the receiving port (111c) communicating with the injection space (111a); and An opening / closing element (112) is movably connected to the housing (111) such that the opening / closing element (112) has a first state and a second state relative to the housing (111); When the opening / closing member (112) is in the first state, the opening / closing member (112) covers the material inlet (111c); When the opening / closing member (112) is in the first state, the opening / closing member (112) exposes the material receiving port (111c).

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