Electrolyte injection device and electrolyte injection system

Abstract

This utility model discloses an electrolyte injection device and injection system, comprising: a pressure chamber for placing a battery cell, the volume of the pressure chamber being larger than the volume of the battery cell, and the pressure chamber being adapted to the battery cell; a cavity door on one side of the pressure chamber for connecting the pressure chamber to the outside; an injection nozzle inside the pressure chamber, the injection nozzle being connected to an electrolyte supply component, a breather valve, and an equalization valve, the electrolyte supply component being used to inject electrolyte into the inner cavity of the battery cell; the equalization valve being connected to the pressure chamber, the equalization valve being used to balance the gas pressure in the inner cavity of the battery cell and the pressure chamber. The adaptation of the pressure chamber to the battery cell means that the cross-section of the pressure chamber is the same as the cross-sectional shape of the battery cell, resulting in less wasted space around the pressure chamber, a corresponding reduction in process gas waste, and a faster pressurization and depressurization process, thereby accelerating the electrolyte wetting time of the battery cell and improving the electrolyte injection efficiency.

Description

Technical Field

[0001] This utility model relates to battery manufacturing equipment, specifically to an electrolyte injection device and injection system. Background Technology

[0002] The principle of electrolyte injection is to inject electrolyte into the limited internal cavity of the battery cell (which includes the cell itself and the unfilled space) through specific processes (such as vacuum, pressure, and time). A portion of the electrolyte permeates the cell (composed of positive and negative electrodes and a separator), while the remainder occupies the unfilled space. The more electrolyte permeates the cell, the better the wetting effect. Furthermore, the shorter the time required to permeate the cell, the better the injector's performance. For a given cell, the deviation between the actual injected volume and the set injection volume is the injection accuracy. For cells from the same batch, better consistency and more concentrated injection volume indicate better overall performance of the injector.

[0003] During the process of injecting electrolyte into the cavity, it is necessary to remove as much air as possible from the cavity to avoid the presence of air bubbles in the cavity of the finished battery cell. The presence of air bubbles will not only affect the amount of electrolyte injected into the battery cell, but will also cause a large deviation in the amount of electrolyte injected between each battery cell, which will seriously affect the performance and quality of the battery cell.

[0004] In existing technologies, to solve the aforementioned technical problems, the technical means adopted are bell-type vertical isobaric injection machines and tunnel-cavity horizontal isobaric injection machines. Before injection, several lithium-ion cells to be injected are placed in the pressure chamber. During pressurization and settling, the pressure chamber pressurizes the internal cavity of the cell, thereby expelling the air inside the cell cavity. However, the pressure chamber of both bell-type vertical isobaric injection machines and tunnel-cavity horizontal isobaric injection machines has a circular cross-section, with a square cell tray placed inside. This results in wasted space around the perimeter. During the pressurization and depressurization of the chamber, a considerable proportion of process gas is wasted in this space, leading to longer injection times and lower injection efficiency. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, this utility model provides an electrolyte injection device and injection system that can reduce the waste of pressure chamber volume and improve injection efficiency and injection accuracy.

[0006] The first technical solution adopted by this utility model to solve its technical problem is:

[0007] An electrolyte injection device includes: a pressure chamber, the volume of which is larger than the volume of the battery cell, and the pressure chamber is adapted to the battery cell;

[0008] The pressure chamber is provided on one side with a door for opening and closing the pressure chamber and allowing the battery cell to enter and exit.

[0009] The pressure chamber is equipped with an injection nozzle, which is connected to an electrolyte supply component, a breather valve, and an equalization valve. The electrolyte supply component is used to inject electrolyte into the inner cavity of the battery cell. The equalization valve is also connected to the pressure chamber and is used to balance the air pressure in the inner cavity of the battery cell and the pressure chamber.

[0010] As a further improvement to the above technical solution, the pressure chamber is provided with an injection cup at the top, and the injection nozzle is located at the lowest point of the injection cup and is connected to the injection cup; the electrolyte supply component, the breather valve, the equal pressure valve, and the breather valve are all connected to the injection cup.

[0011] As a further improvement to the above technical solution, a positioning block (35) is fixedly connected to the bottom of the injection cup, and the injection nozzle is set through the positioning block. The positioning block is used to fix the relative position of the battery cell and the injection nozzle.

[0012] As a further improvement to the above technical solution, the positioning block is provided with guide limiting blocks on its periphery. The opposing surfaces of each guide limiting block are guide surfaces that are inclined toward the direction of the injection nozzle, and the guide surfaces are used to guide the injection nozzle to align with the injection port.

[0013] As a further improvement to the above technical solution, the pressure chamber is provided with a chamber door guide frame on the side where the chamber door is located. The chamber door guide frame is provided with a chamber door guide groove inside. The top of the chamber door guide frame is provided with an upper opening. The chamber door is slidably disposed in the chamber door guide groove of the chamber door guide frame. The upper part of the chamber door extends out from the upper opening of the guide frame and is connected to a lifting connecting rod.

[0014] As a further improvement to the above technical solution, a connecting rod guide frame is provided on the upper part of the cavity door. The lower end of the connecting rod guide frame is fixedly connected to the cavity door guide frame, and the upper end of the connecting rod guide frame has a guide hole. The upper part of the lifting connecting rod passes through the guide hole and is slidably connected to the connecting rod guide frame.

[0015] As a further improvement to the above technical solution, the opening direction of the cavity door is arranged from top to bottom along the pressure chamber, and a pressure block is provided on the lower side of the cavity door;

[0016] The bottom of the pressure chamber is provided with a push block and a lever structure. The lever structure includes a pressure rod near the chamber door and a push rod near the push block.

[0017] The push rod is used to lift the push block, which in turn drives the push block to lift the battery cell;

[0018] When the cavity door is closed, the pressure block is used to press down the pressure rod, and the push rod pushes up the push block.

[0019] As a further improvement to the above technical solution, a plurality of transmission rollers are provided below the pressure chamber and above the lever structure, the transmission rollers being used to guide the battery cell into and out of the pressure chamber.

[0020] As a further improvement to the above technical solution, the push block is provided with several clearance grooves that match the transmission rollers. When the push rod pushes the push block, the push block extends out from the several transmission rollers, the transmission rollers enter the clearance grooves, and the protruding part of the push block extends out from the gap between the transmission rollers and supports the battery cell.

[0021] As a further improvement to the above technical solution, the bottom of the pressure chamber is provided with a first guide and a second guide;

[0022] The first guide passes through the lever structure;

[0023] The second guide is located on the side of the push block away from the lever structure;

[0024] The push block is provided with a first guide hole, and the first guide is slidably connected to the push block through the first guide hole;

[0025] The push block is provided with a second guide hole, and the second guide is slidably connected to the push block through the second guide hole.

[0026] This utility model also provides:

[0027] An electrolyte injection system includes: a circular rotating base, and a plurality of electrolyte injection devices are fixed on the periphery of the circular rotating base;

[0028] An annular slide rail is fixed above the circular rotating base. The annular slide rail is provided with an upwardly extending arc-shaped slide rail and a continuous horizontal slide rail.

[0029] Each cavity door is connected to a cam follower at its top;

[0030] The circular rotating base rotates relative to the annular slide rail to drive the cam follower to slide on the annular slide rail;

[0031] The electrolyte injection device is fixed to the circular rotating base and rotates synchronously with the circular rotating base. When the electrolyte injection device follows the circular rotating base to rotate, the electrolyte injection device drives the cam follower to move within the annular slide rail.

[0032] When the electrolyte injection device is located below the arc-shaped slide rail, the cavity door is in the open state;

[0033] When the electrolyte injection device is located below the horizontal slide rail, the cavity door is in the closed state.

[0034] The beneficial effects of this utility model are:

[0035] In this technical solution, the pressure chamber is adapted to the battery cell, meaning that the cross-section of the pressure chamber is the same as that of the battery cell. This reduces wasted space around the pressure chamber and correspondingly reduces process gas waste. The pressurization and depressurization processes are also faster, thus accelerating the electrolyte wetting time of the battery cell and improving electrolyte injection efficiency. Positive and negative pressure circulation of the battery cell is achieved through equal pressure valves and breather valves, greatly improving injection efficiency. Furthermore, since a door is provided on one side of the pressure chamber for opening and closing the chamber and allowing the battery cell to enter and exit, rapid entry and exit of the battery cell is possible, which is convenient, quick, and helps improve production efficiency.

[0036] Using a small square cavity for single-cell static placement maximizes space utilization. The manufacturing process of the small square cavity is simple, and the static pressure can be increased to over 10MPa, which greatly improves the cell electrolyte injection efficiency, enhances the electrolyte's wetting effect on the electrodes, and thus improves battery quality and performance.

[0037] On the other hand, the aforementioned technical means can increase the pressure in the pressure chamber, which in turn can further increase the electrolyte injection pressure, thereby improving the electrolyte injection efficiency and the battery production efficiency. Attached Figure Description

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0039] Figure 1 This is a three-dimensional structural diagram of the electrolyte injection device;

[0040] Figure 2 It is an exploded view of the injection cup, injection nozzle, and positioning block;

[0041] Figure 3 It is an exploded view of the transfer roller, pusher block, first guide, second guide, and lever structure;

[0042] Figure 4 This is one of the cross-sectional views of an electrolyte injection device;

[0043] Figure 5 This is the second cross-sectional view of the electrolyte injection device;

[0044] Figure 6 This is a front view of the electrolyte injection system;

[0045] Figure 7 This is a rear view of the electrolyte injection system;

[0046] Figure 8 This is a bottom view of the electrolyte injection system;

[0047] The attached figures are labeled as follows:

[0048] 1-Pressure chamber;

[0049] 2-Cavity door; 21-Pressure block; 23-Lifting connecting rod; 24-Connecting rod guide frame;

[0050] 31-Injection nozzle; 32-Electrolyte supply component; 33-Breath valve; 34-Injection cup; 35-Positioning block; 351-Guide limit block; 352-Electrode relief groove; 36-Isobar valve;

[0051] 41-Push block; 411-Leaning groove; 42-Lever structure; 421-Fixed seat; 422-Prying arm; 43-Pressure rod; 44-Push rod; 45-First guide; 46-Second guide;

[0052] 5-Transfer roller;

[0053] 6-Cam follower;

[0054] 100- Circular rotating base;

[0055] 200 - Circular slide rail; 201 - Arc-shaped slide rail; 202 - Horizontal slide rail.

[0056] 300 - Electrolyte injection device;

[0057] 400-cell; Detailed Implementation

[0058] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this utility model can be combined interactively without contradicting each other.

[0059] Reference Figure 1 , Figure 4 , Figure 5An electrolyte injection device 300 includes: a pressure chamber 1, the volume of which is larger than the volume of the battery cell 400, and the pressure chamber 1 is adapted to the battery cell 400;

[0060] The pressure chamber 1 is provided with a door 2 on one side to connect the pressure chamber 1 with the outside.

[0061] The pressure chamber 1 is adapted to the battery cell 400, which means that the cross-section of the pressure chamber 1 is the same as the cross-sectional shape of the battery cell 400. The space around the pressure chamber is less wasted, thus minimizing the ineffective space and reducing the waste rate of process gas. The pressurization and depressurization processes are also faster, thereby accelerating the time for the electrolyte to wet the battery cell 400, improving the electrolyte injection efficiency, enhancing the wetting effect of the electrolyte on the battery cell 400, and ultimately improving the quality and performance of the battery cell 400.

[0062] Reference Figure 4 , Figure 5 In one embodiment, the pressure chamber 1 is provided with an injection nozzle 31, which is connected to an electrolyte supply component 32, a breather valve 33, and an equalization valve 36. The electrolyte supply component 32 is used to inject electrolyte into the inner cavity of the battery cell 400. The electrolyte supply component 32, the breather valve 33, and the equalization valve 36 are also connected to the pressure chamber 1. The equalization valve 36 is used to balance the air pressure in the inner cavity of the battery cell 400 and the pressure chamber 1.

[0063] In some embodiments, the pressure chamber 1 has a door guide frame 22 on its side where the door 2 is located. The door guide frame 22 is a square frame, the shape and size of which are adapted to the door 2. The door guide frame 22 has a door guide groove inside. In this embodiment, the door guide groove is located on the vertical guide frames on both sides inside the door guide frame. In some embodiments, other structures that can achieve the guiding function can be used instead of the door guide groove. The top of the door guide frame 22 has an upper opening. The door 2 is slidably disposed in the door guide groove of the door guide frame 22. The upper part of the door 2 extends out from the upper opening of the guide frame and is connected to a lifting connecting rod 23. Specifically, a connecting rod guide frame 24 is provided on the upper part of the door 2. The lower end of the connecting rod guide frame 24 is fixedly connected to the door guide frame 22. The upper end of the connecting rod guide frame 24 has a guide hole. The upper part of the lifting connecting rod 23 passes through the guide hole and is slidably connected to the connecting rod guide frame 24. In this embodiment, the connecting rod guide frame 24 is inverted U-shape. The lower end of the connecting rod guide frame 24 is fixedly connected to the cavity door guide frame 22, and the upper end of the connecting rod guide frame 24 has a guide sleeve. The guide hole is the central through hole of the guide sleeve. The upper end of the lifting connecting rod 23 passes through the central through hole of the guide sleeve of the connecting rod guide frame 24. Since the lifting connecting rod 23 extends a certain length from the upper part of the cavity door 2, the sliding connection structure between the connecting rod guide frame 24 and the lifting connecting rod 23 can provide better stability for the lifting connecting rod 23. The lifting and lowering of the cavity door 2 is smoother, and the lifting connecting rod 23 will not easily deform, making the structure more stable and reliable. In specific implementation, when the cavity door 2 slides in the cavity door guide groove of the cavity door guide frame 22, the sliding seal of the cavity door 2 can be achieved. The upper end of the lifting connecting rod 23 is connected to the cam follower 6 of the injection system. By utilizing the cooperation structure between the cam follower 6 and the annular slide rail 200, the function of automatically lifting and lowering the cavity door 2 can be realized.

[0064] In use, open chamber 2 and insert the battery cell 400 to be injected into pressure chamber 1, ensuring that the injection port of battery cell 400 is aligned with the injection nozzle 31; close chamber 2 and perform vacuum treatment on battery cell 400 to create a negative pressure state inside battery cell 400. The purpose of this step is to expel the gas inside battery cell 400 and create a pressure difference for subsequent electrolyte injection; after a negative pressure is formed inside battery cell 400, electrolyte supply component 32 is activated to inject electrolyte into battery cell 400. Due to the pressure difference between the inside and outside of battery cell 400, electrolyte will be drawn into battery cell 400. After a certain amount of electrolyte is injected, pressure equalization valve 36 is activated to make the pressure inside battery cell 400 the same as the air pressure in pressure chamber 1. Then, through breather valve 33, a breathing process of filling with high positive pressure, restoring normal pressure, and vacuuming is performed in sequence. The above steps of filling with positive pressure, restoring air pressure, and vacuuming will be repeated several times to ensure that electrolyte fully wets the battery cell.

[0065] Reference Figure 4 , Figure 5 Furthermore, the pressure chamber 1 is provided with an injection cup 34 at the top, and the injection nozzle 31 is located at the lowest point of the injection cup 34 and is connected to the injection cup 34. The electrolyte supply component 32 supplies electrolyte to the injection cup 34. The electrolyte in the injection cup 34 gathers to the lowest point under the action of gravity and flows to the battery cell 400 through the injection nozzle 31, so as to minimize the amount of electrolyte remaining in the injection cup 34.

[0066] Specifically, the injection cup 34 is located at the top of the pressure chamber 1, and during injection, the battery cell 400 is located below the injection cup 34.

[0067] Reference Figure 2 , Figure 4 , Figure 5 Specifically, a positioning block 35 is fixedly connected to the bottom of the injection cup 34, and the injection nozzle 31 is disposed through the positioning block 35. The positioning block 35 is used to fix the relative position of the battery cell 400 and the injection nozzle 31 to ensure that the injection nozzle 31 is aligned with the injection port on the battery cell 400.

[0068] More specifically, the positioning block 35 is provided with a guide limiting block 351 around its periphery, and the positioning block 35 is provided with a pole relief groove 352. The guide limiting block 351 is arranged along the periphery of the battery cell 400 to fix the position of the battery cell 400. Each guide limiting block 351 has a guide surface that is inclined towards the direction of the injection nozzle 31 on its facing surface. The guide surface is used to guide the injection nozzle 31 to align with the injection port. Generally, the battery cell 400 has poles that protrude from the outer shell of the battery cell 400, which may affect the alignment accuracy of the injection nozzle 31 and the injection port. The pole relief groove 352 is provided to cooperate with the pole, which increases the reference object when the injection nozzle 31 is aligned with the injection port, and further improves the alignment accuracy of the injection nozzle 31 and the injection port.

[0069] In any of the above embodiments, the opening direction of the cavity door 2 is from top to bottom along the pressure chamber 1, and a pressure block 21 is provided on the lower side of the cavity door 2;

[0070] The bottom of the pressure chamber 1 is provided with a push block 41 and a lever structure 42. The lever structure 42 includes a pressure rod 43 near the side of the chamber door 2 and a push rod 44 near the side of the push block 41.

[0071] The push rod 44 is used to push up the push block 41, thereby driving the push block 41 to push up the battery cell 400;

[0072] Reference Figure 4 When the cavity door 2 is closed, the pressure block 21 presses down the pressure rod 43, causing the push rod 44 to be lifted. The push rod 44 drives the push block 41 to lift the battery cell 400. Since the battery cell 400 is fixed in position relative to the injection nozzle 31 by the positioning block 35, when the battery cell 400 is lifted, the positioning block 35 can ensure that the injection nozzle 31 is aligned with the injection port on the battery cell 400, thereby ensuring smooth injection. Specifically, under the guidance and limiting action of the guide limiting block 351 of the positioning block 35, the injection port of the battery cell 400 can be accurately connected with the injection nozzle 31.

[0073] Reference Figure 5 When the cavity door 2 is opened, since the pressure rod 43 lacks pressure and the battery cell 400 is located on one side of the push rod 44, the push rod 44 descends under the gravity of the battery cell 400 and the push block 41, and at this time the pressure rod 43 is lifted up.

[0074] Compared to the existing technology that uses a separate drive structure to lift the battery cell 400 so that the injection nozzle 31 is aligned with the injection port, in this embodiment the cavity door 2 and the pressure block 21 are linked. When the cavity door 2 is closed, the injection nozzle 31 is aligned with the injection port. This structure is simple and has low manufacturing cost.

[0075] Reference Figure 3 The lever structure 42 is a conventional configuration in the prior art. As described, the lever structure 42 includes a fixed seat 421 and a rocker arm 422. The fixed seat 421 is fixed to the bottom of the pressure chamber 1 or the side wall of the pressure chamber 1, and the fixed seat 421 is rotatably connected to the rocker arm 422.

[0076] Specifically, the pusher block 41 contacts the surface of the battery cell 400 to reduce instability factors of the battery cell 400 when the pusher block 41 lifts the battery cell 400, making the battery cell 400 more stable.

[0077] Specifically, a plurality of transmission rollers 5 are provided below the pressure chamber 1 and above the lever structure 42. The transmission rollers 5 are used to guide the battery cell 400 in and out of the pressure chamber 1, reduce the friction between the battery cell 400 and the inner wall of the pressure chamber 1, and avoid damage to the appearance and performance of the battery cell 400.

[0078] More specifically, the push block 41 is provided with several clearance grooves 411 that match the transmission rollers 5. When the push rod 44 pushes the push block 41, the push block 41 extends out from the transmission rollers 5 and contacts the battery cell 400. In addition, by providing multiple clearance grooves 411 on the push block 41, the push block 41 can have multiple protrusions that pass through the gaps between the transmission rollers 5 and support the battery cell 400 to ensure that the contact area between the push block 41 and the battery cell 400 is large enough, further reducing the displacement of the battery cell 400 when the push block 41 lifts the battery cell 400 and improving the stability of the battery cell 400 during lifting.

[0079] In any of the above embodiments, the bottom of the pressure chamber 1 is provided with a first guide 45 and a second guide 46;

[0080] The first guide 45 passes through the lever structure 42 and is slidably connected to the push block 41. Specifically, the push block 41 is provided with a first guide hole 451, and the first guide 45 is slidably connected to the push block 41 through the first guide hole 451.

[0081] The second guide 46 is located on the side of the push block 41 away from the lever structure 42 and is slidably connected to the push block 41. The push block 41 has a second guide hole 461, through which the second guide 46 is slidably connected to the push block 41. The first guide 45 and the second guide 46 assist the push block 41 in a smooth sliding state when it is lifted, further reducing the probability of displacement of the battery cell 400 during the lifting process.

[0082] And when push block 41 is lifted to its highest point, refer to Figure 4 The push block 41 is held by the battery cell 400 and the push rod 44. At this time, the stability of the push block 41 depends on whether the cavity door 2 will be opened. As long as the cavity door 2 remains closed, the positions of the push block 41 and the battery cell 400 in the pressure chamber 1 will remain fixed, and the injection nozzle 31 will always remain in contact with the injection port. After the push block 41 pushes the battery cell 400 to its highest point, the position of the injection port of the battery cell 400 matches the position of the injection nozzle 31 on the injection cup 34. At this time, the electrolyte in the injection cup 34 can be injected into the battery cell 400 through the injection nozzle 31.

[0083] Reference Figure 6 , Figure 7 , Figure 8An electrolyte injection device 300 includes: a circular rotating base 100, and several electrolyte injection devices 300 described in any of the above embodiments are fixed on the periphery of the circular rotating base 100.

[0084] An annular slide rail 200 is fixed above the circular rotating base 100, and the circular rotating base 100 and the annular slide rail 200 are connected in a rotatable manner. The annular slide rail 200 is provided with an upward-facing arc-shaped slide rail 201 and a horizontal slide rail 202.

[0085] Each cavity door 2 is connected to a cam follower 6 at its top. Specifically, in this embodiment, the cam follower 6 is located at the upper end of the lifting connecting rod 23 connected to the upper end of the cavity door 2. In application, the cam follower 6 extends into the annular slide rail 200 and can slide within the annular slide rail 200.

[0086] The circular rotating base 100 rotates relative to the annular slide rail 200 to drive the cam follower 6 to slide on the annular slide rail 200;

[0087] The electrolyte injection device 300 is fixed to the circular rotating base 100 and rotates synchronously with the circular rotating base 100. When the electrolyte injection device 300 rotates with the circular rotating base 100, the electrolyte injection device 300 drives the cam follower 6 to move within the annular slide rail 200.

[0088] When the electrolyte injection device 300 moves to below the arc-shaped slide rail 201, the cavity door 2 is in the open state;

[0089] When the electrolyte injection device 300 moves below the horizontal slide rail 202, the cavity door 2 is in a closed state.

[0090] Therefore, the opening and closing of the cavity gate 2 of the electrolyte injection device 300, the lever structure 42 driving the push block 41 to lift the battery cell 400, and the injection port of the battery cell 400 aligning with the injection nozzle 31 are all achieved. This process is completed when the cam follower 6 slides from the arc-shaped slide rail 201 to the horizontal slide rail 202. Therefore, as long as the circular rotating base 100 is kept rotating relative to the annular slide rail 200, it can be ensured that each electrolyte injection device 300 on the circular rotating base 100 completes injection in sequence. Furthermore, when the speed of the circular rotating base 100 rotating one revolution relative to the annular slide rail 200 remains constant, the differences between the battery cells 400 in each electrolyte injection device 300 can be minimized, improving the consistency between the battery cells.

[0091] Compared to bell-type vertical isobaric injection machines and tunnel-type horizontal isobaric injection machines, this device can accommodate more battery cells in the same space, effectively saving the system's floor space.

[0092] More specifically, the circumference of the horizontal slide rail 202 is greater than the circumference of the arc-shaped slide rail 201. When the electrolyte injection device 300 is located below the horizontal slide rail 202, the battery cell 400 is in an injection or stationary state. Compared to the prior art where the injection device and the stationary device are separate, after injection, the battery cell needs to be manually or by a logistics handling mechanism to be moved from the injection device to the stationary device for stationary placement. The logistics handling mechanism is complex in design, resulting in a large overall footprint, high overall equipment cost, and difficulty in forming a standardized battery cell manufacturing process. In this embodiment, the injection device and the stationary device are integrated, resulting in a compact structure, simple design, and lower manufacturing cost.

[0093] Furthermore, existing isobaric injection machines require the battery cells to be placed in a carrier during injection, transport, and settling. The battery cells complete each process step along with the carrier, resulting in tray loading and unloading. In this embodiment, however, the battery cells do not require any follow-up carriers as they rotate with the circular rotating base 100. Of course, after the battery cells enter the pressure chamber 1, the stable cooperation of the positioning block 35, lever structure 42, and push block 41 ensures accurate positioning of the battery cells during the injection process.

[0094] It is understood that the circular rotating base 100 is coaxial with the annular slide rail 200, and the circular rotating base 100 rotates on its own axis.

[0095] It is understood that the protrusion of the arc-shaped slide rail 201 is directed toward the top of the pressure chamber 1.

[0096] The working principle of this system is as follows:

[0097] Reference Figures 1-8 When the external feeding mechanism or manual personnel are located on one side of the arc-shaped slide rail 201, and wait for the cavity door 2 of one of the electrolyte injection devices 300 to open, the external feeding mechanism or manual personnel put the battery cell 400 into the pressure chamber 1. As the circular rotating base 100 rotates, the cam follower 6 slides from the arc-shaped slide rail 201 to the horizontal slide rail 202, and at the same time drives the cavity door 2 to close. The pressure rod 43 descends under the action of the pressure block 21, so that the top rod 44 is lifted. The top rod 44 drives the push block 41 to lift the battery cell 400. Under the guidance of the guide limit block 351, the top edge of the battery cell 400 is aligned with the injection nozzle 31 and the injection port.

[0098] After evacuating the pressure chamber 1 and maintaining the vacuum pressure for a period of time, the electrolyte supply device 32 is turned on, and the electrolyte is injected into the battery cell 400 through the injection cup 34 and the injection nozzle 31. Then the equal pressure valve 36 is turned on, and then the breathing valve 36 is turned on. After several cycles of positive and negative pressure breathing, the pressure chamber 1 is depressurized. At this time, the electrolyte injection device 300 also slides to the junction of the horizontal slide rail 202 and the arc slide rail 201. As the circular rotating base 100 rotates further, the cam follower 6 slides from the horizontal slide rail 202 to the arc slide rail 201, the cavity door 2 is opened, and the battery cell 400 can be taken out.

[0099] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. An electrolyte injection device, characterized in that, include: Pressure chamber (1), the volume of the pressure chamber (1) is larger than the volume of the battery cell, and the pressure chamber (1) is adapted to the battery cell; The pressure chamber (1) is provided with a door (2) on one side for opening and closing the pressure chamber (1) and allowing the battery cell to enter and exit. The pressure chamber (1) is provided with an injection nozzle (31), which is connected to an electrolyte supply component (32), a breather valve (33) and an equal pressure valve (36). The electrolyte supply component (32) is used to inject electrolyte into the inner cavity of the battery cell. The equal pressure valve (36) is also connected to the pressure chamber (1) and is used to balance the air pressure in the inner cavity of the battery cell and the pressure chamber (1).

2. The electrolyte injecting apparatus according to claim 1, wherein The pressure chamber (1) is provided with an injection cup (34) at the top, and the injection nozzle (31) is located at the lowest point of the injection cup (34) and is connected to the injection cup (34); the electrolyte supply component (32), the breathing valve (33) and the equal pressure valve (36) are all connected to the injection cup (34).

3. The electrolyte injecting apparatus according to claim 2, wherein: The bottom of the injection cup (34) is fixedly connected to a positioning block (35), and the injection nozzle (31) is set through the positioning block (35). The positioning block (35) is used to fix the relative position of the battery cell and the injection nozzle (31).

4. The electrolyte injecting apparatus according to claim 3, wherein: The positioning block (35) is provided with a guide limiting block (351) on its periphery. The opposing surfaces of each guide limiting block (351) are guide surfaces that are inclined toward the direction of the injection nozzle (31). The guide surfaces are used to guide the injection nozzle (31) to align with the injection port of the battery cell (400).

5. The electrolyte injection apparatus according to claim 1, wherein: The pressure chamber (1) has a chamber door guide frame (22) on the side where the chamber door (2) is located. The chamber door guide frame (22) has a chamber door guide groove inside. The top of the chamber door guide frame (22) has an upper opening. The chamber door (2) is slidably located in the chamber door guide groove of the chamber door guide frame (22). The upper part of the chamber door (2) extends out from the upper opening of the guide frame and is connected to a lifting connecting rod (23).

6. The electrolyte injection device according to claim 5, wherein: The upper part of the cavity door (2) is provided with a connecting rod guide frame (24). The lower end of the connecting rod guide frame (24) is fixedly connected to the cavity door guide frame (22). The upper end of the connecting rod guide frame (24) has a guide hole. The upper part of the lifting connecting rod (23) passes through the guide hole and is slidably connected to the connecting rod guide frame (24).

7. The electrolyte injection device according to any one of claims 1 to 6, wherein: The opening direction of the cavity door (2) is set from top to bottom along the pressure chamber (1), and a pressure block (21) is provided on the lower side of the cavity door (2). The pressure chamber (1) is provided with a push block (41) and a lever structure (42) at the bottom. The lever structure (42) includes a pressure rod (43) near the side of the chamber door (2) and a push rod (44) near the side of the push block (41). The push rod (44) is used to lift the push block (41), thereby driving the push block (41) to lift the battery cell; When the cavity door (2) is closed, the pressure block (21) is used to press down the pressure rod (43), and the push rod (44) pushes up the push block (41).

8. The electrolyte injecting apparatus according to claim 7, wherein: Several transmission rollers (5) are provided below the pressure chamber (1) and above the lever structure (42), and the transmission rollers (5) are used to guide the battery cell into and out of the pressure chamber (1). The push block (41) is provided with several clearance grooves (411) that match the transmission rollers (5). When the push rod (44) pushes the push block (41), the push block (41) extends out from the several transmission rollers (5), the transmission rollers (5) enter the clearance grooves (411), and the protruding part of the push block (41) extends out from the gap between the transmission rollers (5) and supports the battery cell (400).

9. The electrolyte injecting apparatus according to claim 8, wherein: The pressure chamber (1) is provided with a first guide (45) and a second guide (46) at the bottom; The first guide (45) passes through the lever structure (42); The second guide (46) is located on the side of the push block (41) away from the lever structure (42); The push block (41) is provided with a first guide hole (451), and the first guide (45) is slidably connected to the push block (41) through the first guide hole (451); The push block (41) is provided with a second guide hole (461), and the second guide (46) is slidably connected to the push block (41) through the second guide hole (461).

10. An electrolyte injection system, characterized by comprising: include: A circular rotating base (100) is provided with several electrolyte injection devices (300) as described in any one of claims 1-9 fixed around its periphery. An annular slide rail (200) is fixed above the circular rotating base (100). The annular slide rail (200) is provided with an upwardly extending arc-shaped slide rail (201) and a continuous horizontal slide rail (202). Each cavity door (2) is connected to a cam follower (6) at its top; The circular rotating base (100) rotates relative to the annular slide rail (200) to drive the cam follower (6) to slide on the annular slide rail (200); The electrolyte injection device (300) is fixed to the circular rotating base (100) and rotates synchronously with the circular rotating base (100). When the electrolyte injection device (300) rotates with the circular rotating base (100), the electrolyte injection device (300) drives the cam follower (6) to move within the annular slide rail (200). When the electrolyte injection device is located below the arc-shaped slide rail (201), the cavity door (2) is in the open state; When the electrolyte injection device is located below the horizontal slide rail (202), the cavity door (2) is in a closed state.

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