Liquid injection equipment and battery production line

Abstract

The utility model discloses liquid injection equipment and a battery production line, a battery is provided with a liquid injection port, the liquid injection equipment comprises a liquid injection mechanism and a liquid supply mechanism, the liquid injection mechanism comprises a liquid injection cup and a gas source assembly, the liquid injection cup is provided with a first liquid injection nozzle, a first liquid inlet and a ventilation port, and the first liquid injection nozzle is in butt joint with the liquid injection port; the air source assembly is used for controlling the air pressure in the liquid injection cup to be switched between positive pressure and negative pressure through the air vent; the liquid supply mechanism comprises a buffer cup, a first valve body, a second liquid injection nozzle and a liquid pumping assembly, the buffer cup is provided with a liquid outlet and a second liquid inlet, the liquid pumping assembly is connected to the second liquid inlet, the first valve body is connected between the liquid outlet and the second liquid injection nozzle, and the second liquid injection nozzle is in butt joint with the first liquid inlet. The first liquid inlet is blocked by the second liquid injection nozzle, and the liquid injection port is blocked by the first liquid injection nozzle, so that the air tightness of the liquid injection cup and the interior of the battery is ensured, vacuumizing and liquid pumping are synchronously carried out, the liquid injection efficiency is improved, a valve body does not need to be additionally arranged, and the maintenance cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of battery liquid injection, and in particular to a liquid injection device and a battery production line. Background Art

[0002] like Figure 4 As shown, when the battery is filled with liquid during the battery manufacturing process, it is necessary to evacuate the inside of the battery. The injection needle 02 is lowered by the lifting plate 07 to dock with the filling hole of the battery 01, and then the plug 06 is moved down by the lifting rod 08 to dock with the injection hole 05 of the injection cup 04. At this time, the battery 01 and the injection cup 04 are internally connected (the control valve 03 is in the open state), and the gas inside the battery 01 and the injection cup 04 is extracted by the exhaust device to form a vacuum, and the control valve 03 is closed to ensure the vacuum inside the battery 01; during the subsequent injection, the plug 06 is moved up, the inside of the injection cup 04 is restored to normal pressure, and the injection hole 05 is connected to the injection device to inject electrolyte into the injection cup 04. After the injection is completed, the injection device is removed, and the plug 06 is moved down again to block the injection hole 05, and the control valve 03 is opened to start injection. In the above steps, the vacuum operation is completed through the control valve 03, and residual liquid is prevented from dripping onto the product surface. However, crystallization of the electrolyte occurs during long-term production, which will affect the on-off of the control valve 03. This method has a large number of control valves 03 and is difficult to disassemble and clean, resulting in high maintenance costs. In addition, when vacuuming, the plug 06 needs to be raised and lowered, and the mechanism movement is cumbersome, which affects the injection efficiency.

[0003] Therefore, it is necessary to improve the existing technology. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art and provides a liquid injection device and a battery production line.

[0005] According to one aspect of the present application, the present application provides a liquid injection device for injecting electrolyte into a battery, the battery being provided with a liquid injection port, the liquid injection device comprising: a liquid injection mechanism and a liquid supply mechanism, the liquid injection mechanism comprising a liquid injection cup and an air source assembly, the liquid injection cup having a first liquid injection nozzle, a first liquid inlet and an air vent, the first liquid injection nozzle being used to dock with the liquid injection port, the air source assembly being connected to the air vent, the air source assembly being used to control the air pressure in the liquid injection cup to switch between positive pressure and negative pressure; the liquid supply mechanism comprising a cache cup, a first valve body, a second liquid injection nozzle and a liquid pump assembly, the cache cup having a liquid outlet and a second liquid inlet, the liquid pump assembly being connected to the second liquid inlet, the first valve body being connected between the liquid outlet and the second liquid injection nozzle to selectively open or block the liquid outlet and the second liquid injection nozzle, the second liquid injection nozzle being docked with the first liquid inlet.

[0006] Furthermore, the air source assembly includes a ventilation main pipe, a positive pressure sub-pipe, a negative pressure sub-pipe and a second valve body, the positive pressure sub-pipe and the negative pressure sub-pipe are respectively connected to one end of the ventilation main pipe, and the other end of the ventilation main pipe is connected to the vent, the positive pressure sub-pipe is used to connect to a positive pressure air source, and the negative pressure sub-pipe is used to connect to a negative pressure air source, and the second valve body is arranged on the ventilation main pipe, the positive pressure sub-pipe and the negative pressure sub-pipe to selectively open or block the ventilation main pipe, the positive pressure sub-pipe and the negative pressure sub-pipe.

[0007] Optionally, the injection mechanism also includes a first driving structure, which is used to drive the first injection nozzle to selectively block or open the injection port; the liquid supply mechanism also includes a second driving structure, which is used to drive the second injection nozzle to selectively block or open the first liquid inlet.

[0008] Furthermore, the liquid injection equipment also includes a turntable and a third driving structure, and a plurality of workstations are spaced apart along the circumference of the turntable, each of the workstations is provided with the liquid injection mechanism, and the third driving structure is used to drive the turntable to rotate so that the first liquid inlet in each of the liquid injection mechanisms is sequentially docked with the second liquid injection nozzle in the liquid supply mechanism to inject liquid into the liquid injection cup.

[0009] Furthermore, each of the workstations is also provided with a blocking block and a fourth driving structure, and the fourth driving structure is used to drive the blocking block to selectively block or open the first liquid inlet.

[0010] Furthermore, the air source assembly includes a ventilation main pipe, a positive pressure sub-pipe, a negative pressure sub-pipe, an air slip ring and a second valve body. The positive pressure sub-pipe and the negative pressure sub-pipe are respectively connected to one end of the ventilation main pipe through the air slip ring, and the other end of the ventilation main pipe is connected to the air port. The positive pressure sub-pipe is used to connect to a positive pressure air source, and the negative pressure sub-pipe is used to connect to a negative pressure air source. The ventilation main pipe rotates with the turntable, and the second valve body is arranged on the ventilation main pipe, the positive pressure sub-pipe and the negative pressure sub-pipe to selectively open or block the ventilation main pipe, the positive pressure sub-pipe and the negative pressure sub-pipe.

[0011] Furthermore, the pump liquid assembly includes an injection pump and a third valve body, and the third valve body is arranged between the injection pump and the second liquid inlet to selectively connect or block the injection pump and the second liquid inlet.

[0012] Furthermore, the ventilation main pipe is connected to a pressure gauge to measure the air pressure inside the ventilation main pipe.

[0013] Furthermore, along the rotation direction of the turntable, the multiple workstations are sequentially a loading and unloading workstation, a vacuum preparation workstation, a liquid feeding workstation, an enhanced liquid feeding workstation and a residual liquid workstation.

[0014] According to another aspect of the present application, a battery production line is provided, comprising any of the aforementioned liquid injection devices, the production line also comprising a loading device, a weighing device and a unloading device, the loading device being used to deliver the battery to be injected to the liquid injection device, the weighing device being used to weigh the battery before and after injection, and the unloading device being used to move the battery that has completed injection out of the liquid injection device.

[0015] The beneficial effects of the present application are as follows: the present application seals the first liquid inlet through the second liquid injection nozzle, the first liquid injection nozzle seals the liquid injection port, and the second liquid injection nozzle and the liquid outlet are blocked by the first valve body, thereby ensuring the air tightness of the liquid injection cup and the inside of the battery. Under the control of the air source component, the liquid injection cup and the inside of the battery are in a negative pressure state (i.e., vacuuming). While the air source component is vacuuming, the pumping component can pump liquid into the buffer cup simultaneously, thereby improving the liquid injection efficiency. After the pumping component pumps liquid and the air source component vacuumizes, the first valve body is opened. Valve body, electrolyte flows into the filling cup and the battery, there is no need to add a valve body at the bottom of the filling cup, reducing production and maintenance costs. After all the electrolyte is injected into the filling cup (part of the electrolyte has entered the battery), the first valve body is closed, and the positive and negative pressures inside the filling cup are controlled alternately by the air source component to inject the remaining electrolyte in the filling cup into the battery, effectively reducing the crystallization phenomenon caused by electrolyte residue and effectively improving the filling quality. The filling equipment also has the characteristics of simple structure and no need for additional mechanism action, thereby improving the filling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0017] Figure 1 It is a schematic diagram of a liquid injection device provided in an embodiment of the present application.

[0018] Figure 2 It is a schematic diagram of a liquid injection mechanism and a blocking block provided in an embodiment of the present application.

[0019] Figure 3 It is a schematic diagram of a turntable structure provided in an embodiment of the present application.

[0020] Figure 4 It is a structural schematic diagram of a liquid injection mechanism in the prior art.

[0021] In the figure:

[0022] 10. Battery; 11. Liquid filling port;

[0023] 20. Liquid injection mechanism; 21. Liquid injection cup; 211. First liquid injection nozzle; 212. First liquid inlet; 213. Air vent; 22. Air source assembly; 221. Ventilation main pipe; 222. Positive pressure sub-pipe; 223. Negative pressure sub-pipe; 224. Second valve body; 225. Air slip ring; 226. Positive pressure air source; 227. Negative pressure air source;

[0024] 30. Liquid supply mechanism; 31. Buffer cup; 311. Liquid outlet; 312. Second liquid inlet; 32. First valve body; 33. Second liquid injection nozzle; 34. Liquid pump assembly; 341. Liquid injection pump; 342. Third valve body;

[0025] 40. Turntable; 41. Blocking block;

[0026] 50. Pressure gauge;

[0027] 60. Loading and unloading station; 61. Vacuum preparation station; 62. Liquid inlet station; 63. Strengthened liquid inlet station; 64. Residual liquid station. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0029] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0030] In order to solve the problems of difficult disassembly and cleaning, high maintenance cost and low injection efficiency in the prior art, an embodiment of the present application provides an injection device for injecting electrolyte into a battery, wherein the battery is provided with an injection port, the injection device comprises an injection mechanism and a liquid supply mechanism, the injection mechanism comprises an injection cup and an air source component, the injection cup has a first injection nozzle, a first liquid inlet and an air vent, the first injection nozzle is used to dock with the injection port, the air source component is connected to the air vent, and the air source component is used to control the air pressure in the injection cup to switch between positive pressure and negative pressure; the liquid supply mechanism comprises a buffer cup, a first valve body, a second injection nozzle and a pump assembly, the buffer cup has a liquid outlet and a second liquid inlet, the pump assembly is connected to the second liquid inlet, the first valve body is connected between the liquid outlet and the second injection nozzle to selectively conduct or block the liquid outlet and the second injection nozzle, and the second injection nozzle is docked with the first liquid inlet. The following is a detailed description.

[0031] See also Figure 1 In one embodiment, the liquid injection device is used to inject electrolyte into the battery 10 through the liquid injection port 11 of the battery 10. The liquid injection device includes a liquid injection mechanism 20 and a liquid supply mechanism 30. The liquid injection mechanism 20 includes a liquid injection cup 21 and an air source component 22. The liquid injection cup 21 has a first liquid injection nozzle 211, a first liquid inlet 212 and a vent 213. The first liquid injection nozzle 211 is used to dock with the liquid injection port 11. The first liquid injection nozzle 211 can block the liquid injection port 11 to ensure the air tightness inside the battery 10. The air source component 22 is connected to the vent 213. The liquid injection cup can be controlled by the air source component 22. The air pressure inside 21 is switched between positive and negative pressure states; the liquid supply mechanism 30 includes a buffer cup 31, a first valve body 32, a second liquid injection nozzle 33 and a liquid pumping assembly 34, the buffer cup 31 has a liquid outlet 311 and a second liquid inlet 312, the liquid pumping assembly 34 is connected to the second liquid inlet 312, and electrolyte is pumped into the buffer cup 31 through the second liquid inlet 312, the first valve body 32 is arranged between the liquid outlet 311 and the second liquid injection nozzle 33, the first valve body 32 controls the connection between the liquid outlet 311 and the second liquid injection nozzle 33, and the second liquid injection nozzle 33 is connected to the first liquid inlet 212.

[0032] The first liquid injection nozzle 211 is docked on the liquid injection port 11, the interior of the battery 10 is connected with the interior of the liquid injection cup 21, and the second liquid injection nozzle 33 is docked on the first liquid inlet 212 to isolate the interior of the battery 10 and the interior of the liquid injection cup 21 from the outside, thereby ensuring the air tightness of the battery 10 and the interior of the liquid injection cup 21, and the first valve body 32 is in a closed state (that is, the liquid outlet 311 is not connected to the second liquid injection nozzle 33). At this time, the pump liquid component 34 and the air source component 22 start working at the same time, and the pump liquid component 34 pumps electrolyte into the buffer cup 31 through the second liquid inlet 312, and the air source component 22 extracts the gas inside the liquid injection cup 21 and the battery 10, so that the liquid injection cup 21 and the battery 10 are in a negative pressure state (vacuum state), and the pump liquid component 34 and the gas source component 22 start working at the same time. The first valve body 32 is opened, and the liquid outlet 311 is connected to the second liquid injection nozzle 33. At this time, the electrolyte in the buffer cup 31 is guided to the injection cup 21 and the battery 10 under the action of gas pressure (the gas pressure in the buffer cup 31 is greater than the gas pressure inside the injection cup 21 and the battery 10), wherein part of the electrolyte directly enters the battery 10, and the remaining electrolyte remains in the injection cup 21. At this time, the gas pressure in the injection cup 21 is not enough to inject the remaining electrolyte into the battery 10. At this time, the first valve body 32 is closed, and the gas source assembly 22 is used to control the gas pressure in the injection cup 21 to switch back and forth between positive pressure and negative pressure, and the remaining electrolyte is hydraulically injected into the battery 10 to complete the injection. When the injection cup 21 switches back and forth between positive pressure and negative pressure, the residual electrolyte can be effectively prevented from crystallizing due to standing still, so there is no need to disassemble the injection cup 21 for cleaning, which can ultimately effectively improve the smoothness and efficiency of injection.

[0033] It should be noted that in order to ensure the vacuum degree inside the injection cup 21 and the battery 10 to speed up the filling speed of the electrolyte, the material of the first injection nozzle 211 can be EPDM rubber, which has good corrosion resistance, and can ensure the airtightness between the first injection nozzle 211 and the injection port 11 to prevent leakage of gas and electrolyte; the injection cup 21 and the buffer cup 31 can be made of stainless steel, which has good corrosion resistance, and the smoothness Ra of the injection cup 21 and the buffer cup 31 is Ra≤0.8, the electrolyte is not easy to remain in the injection cup 21 and the buffer cup 31, and will not cause waste of electrolyte. The injection amount can be accurately controlled, and the injection quality is effectively improved. In some embodiments, other materials can also be selected, which will not be repeated here. In addition, the connection of the pump assembly 34, the first valve body 32, the second injection nozzle 33 and other components can be connected through Teflon pipes, which have good corrosion resistance and certain flexibility, are conducive to the arrangement of the positions of various components, and improve the service life.

[0034] In addition, in some embodiments, the above-mentioned vent 213 and the above-mentioned first filling nozzle 211 are respectively arranged on both sides of the above-mentioned filling cup 21 in the gravity direction, and the above-mentioned first filling nozzle 211 is arranged below the filling cup 21. In this way, when the filling cup 21 and the inside of the battery 10 are in a vacuum state and liquid injection begins, the electrolyte enters from the first liquid inlet 212 and flows directly to the first filling nozzle 211. Under the action of gas pressure, the electrolyte will not be disturbed, and will not splash into the above-mentioned vent 213 to produce crystals to block the vent 213.

[0035] Please continue reading Figure 1 In one embodiment, the air source assembly 22 includes a ventilation main pipe 221, a positive pressure sub-pipe 222, a negative pressure sub-pipe 223 and a second valve body 224. One end of the ventilation main pipe 221 is connected to the positive pressure sub-pipe 222 and the negative pressure sub-pipe 223, and the other end of the ventilation main pipe 221 is connected to the vent 213. The positive pressure sub-pipe 222 is used to connect to the positive pressure air source 226, and the negative pressure sub-pipe 223 is used to connect to the negative pressure air source 227. The second valve body 224 is arranged on the ventilation main pipe 221, the positive pressure sub-pipe 222 and the negative pressure sub-pipe 223, and can selectively connect the ventilation main pipe 221, the positive pressure sub-pipe 222 and the negative pressure sub-pipe 223. Through the control of the above-mentioned second valve body 224, the positive pressure sub-tube 222 can be connected to the ventilation main pipe 221, and positive pressure can be formed in the ventilation main pipe 221 through the positive pressure gas source 226. The negative pressure sub-tube 223 can also be connected to the ventilation main pipe 221, and negative pressure can be formed in the ventilation main pipe 221 through the negative pressure gas source 227, thereby controlling the inside of the injection cup 21 to be in a negative pressure state or a positive pressure state.

[0036] It should be noted that, in the above-mentioned embodiment, three second valve bodies 224 may be provided, and they are respectively arranged on the pipelines of the ventilation main pipe 221, the positive pressure sub-pipe 222 and the negative pressure sub-pipe 223. By opening and closing different second valve bodies 224, the connection between the positive pressure sub-pipe 222 and the ventilation main pipe 221 or the negative pressure sub-pipe 223 and the ventilation main pipe 221 is realized. After completing the vacuum operation inside the filling cup 21 and the battery 10, the three second valve bodies 224 are all closed to maintain the vacuum state inside the filling cup 21 and the battery 10 to complete the initial filling (the electrolyte flows from the buffer cup 31 to the filling cup 21 and the battery 10). Not limited to this, in some embodiments, the second valve body 224 can also be set in other forms, which will not be repeated here.

[0037] In one embodiment, the injection mechanism 20 further includes a first driving structure. Under the action of the first driving structure, the first injection nozzle 211 selectively blocks or opens the injection port 11, that is, the first injection nozzle 211 can dock with the injection port 11 to block the injection port 11, or can be away from the injection port 11. When the first injection nozzle 211 is away from the injection port 11, the battery 10 can be replaced to perform the injection operation of different batteries 10. When the first injection nozzle 211 is in the first driving structure, the battery 10 can be replaced. When the first liquid injection nozzle 211 is docked with the above-mentioned liquid injection port 11 under the drive of the above-mentioned first driving structure, due to the driving force applied by the above-mentioned first driving structure to the first liquid injection nozzle 211, the above-mentioned first liquid injection nozzle 211 can be better docked with the above-mentioned liquid injection port 11, thereby effectively improving the airtightness inside the battery 10; the above-mentioned liquid supply assembly also includes a second driving structure, and the above-mentioned second liquid injection nozzle 33 is under the action of the above-mentioned second driving structure to selectively block or open the above-mentioned first liquid inlet 212. The function of the above-mentioned second driving structure is equivalent to that of the above-mentioned first driving structure, which will not be repeated here.

[0038] It should be noted that the above-mentioned first driving structure may include a moving plate, a slide rail and a driving cylinder in some embodiments. The above-mentioned injection mechanism 20 is arranged on the above-mentioned moving plate. The moving plate reciprocates on the above-mentioned slide rail under the action of the above-mentioned driving cylinder, thereby driving the above-mentioned first injection nozzle 211 to move toward or away from the above-mentioned injection port 11. It is not limited to this, and it can also be other forms of settings. The same is true for the above-mentioned second driving structure, which will not be repeated here.

[0039] See also Figure 3 In one embodiment, the liquid injection device further comprises a turntable 40 and a third driving structure. A plurality of stations are arranged at intervals along the circumference of the turntable 40. Each station is provided with the liquid injection mechanism 20. The third driving structure drives the turntable 40 to rotate so that the first liquid inlet 212 in each of the liquid injection mechanisms 20 is sequentially docked with the second liquid injection nozzle 33 in the liquid supply mechanism 30 to inject liquid into the liquid injection cup 21. Each of the stations is provided with a blocking block 41 and a fourth driving structure (such as Figure 2 As shown), the fourth driving structure drives the blocking block 41 to selectively block or open the first liquid inlet 212. The specific configuration of the fourth driving structure is not described in detail here.

[0040] In the above embodiment, the above-mentioned workstations are provided with nine workstations, the above-mentioned liquid supply mechanism 30 corresponds to one of the workstations, and each workstation is provided with eight above-mentioned injection mechanisms 20, that is, each workstation can realize the injection operation of eight batteries 10 at the same time, therefore, the above-mentioned liquid supply mechanism 30 is provided with eight correspondingly, in some embodiments, it can be set in other numbers, not limited to this; along the rotation direction of the above-mentioned turntable 40, the above-mentioned nine workstations are respectively a loading and unloading workstation 60, a vacuum preparation workstation 61, a liquid inlet workstation 62, five enhanced liquid inlet workstations 63 and a residual liquid workstation 64; the above-mentioned loading and unloading workstation 60 is used to deliver the battery 10 to be injected with liquid to the turntable 40, and the battery to be injected with liquid entering the loading and unloading workstation 60 10 enters the vacuum preparation station 61 under the rotation of the turntable 40, and the first driving structure drives the first liquid injection nozzle 211 to move toward the liquid injection port 11 of the battery 10 to be injected, until the liquid injection port 11 is blocked; after the liquid injection port 11 is blocked, the battery 10 to be injected is transferred to the liquid inlet station 62, and at the liquid inlet station 62, the second driving structure drives the second liquid injection nozzle 33 to block the first liquid inlet 212, at which time the first valve body 32 is in a closed state, and the liquid injection cup 21 and the interior of the battery 10 to be injected are separated from the outside world, and while the liquid injection cup 21 and the interior of the battery 10 are vacuumed by the air source component 22, the pump liquid component 34 pumps a fixed amount (according to different models of batteries 10) into the buffer cup 31. After the pump assembly 34 completes pumping liquid into the buffer cup 31 and the air source assembly 22 completes the vacuum operation (both the injection cup 21 and the battery 10 are vacuum), the first valve body 32 is opened, and the electrolyte flows from the buffer cup 31 to the injection cup 21, and part of the electrolyte is directly injected into the battery 10. As the injection operation proceeds, the electrolyte flows from the buffer cup 31 into the injection cup 21. At this time, the air pressure (close to normal pressure) in the injection cup 21 is not enough to inject the remaining electrolyte into the battery 10. The second drive structure drives the second injection nozzle 33 to leave the above-mentioned first liquid inlet 212, and the turntable 40 rotates to the enhanced liquid inlet station 63, and the above-mentioned fourth drive structure drives the upper The blocking block 41 blocks the first liquid inlet 212 to ensure that the filling cup 21 and the inside of the battery 10 are isolated from the outside world. The air pressure in the filling cup 21 is controlled to switch back and forth between negative pressure and positive pressure through the air source component 22, and the remaining electrolyte is gradually injected into the battery 10. By setting five enhanced liquid inlet stations 63, it can be ensured that all the electrolyte is injected into the battery 10. After passing through five enhanced liquid filling stations, it enters the residual liquid station 64, drives the first driving structure, drives the first liquid filling nozzle 211 away from the liquid filling port 11, collects the residual liquid in the filling cup 21, and transfers the battery 10 after the liquid filling to the loading and unloading station 60 through the turntable 40 for unloading. This cycle improves the liquid filling efficiency.

[0041] It should be noted that, at the residual liquid station 64, the above-mentioned first liquid injection nozzle 211 leaves the above-mentioned liquid injection port 11 under the action of the first driving structure. In order to ensure that the residual electrolyte does not drip from the first liquid injection nozzle 211 to the surface of the battery 10, after the first liquid injection nozzle 211 leaves the liquid injection port 11, the air source component 22 controls the air pressure inside the liquid injection cup 21 to be less than the atmospheric pressure (at this time, the blocking block 41 is still abutted against the above-mentioned first liquid inlet 212) to avoid the dripping of residual electrolyte. After the residual liquid collection plate (not marked in the figure) in the residual liquid station 64 moves to the bottom of the first liquid injection nozzle 211, the internal air pressure of the liquid injection cup 21 is controlled to discharge the residual liquid in time to avoid electrolyte crystallization blocking the first liquid injection nozzle 211. Such an arrangement does not require an additional valve body to be set at the bottom of the liquid injection cup 21, thereby reducing maintenance costs.

[0042] In one embodiment, the air source assembly 22 further includes an air slip ring 225, the ventilation main pipe 221 is connected to the rotor of the air slip ring 225 and rotates with the turntable 40, the positive pressure sub-pipe 222 and the negative pressure sub-pipe 223 are connected to the stator of the air slip ring 225 and do not rotate with the turntable 40. This arrangement prevents the pipeline from twisting during rotation, does not affect use, and effectively improves the service life of the pipeline.

[0043] Please continue reading Figure 1 In one embodiment, the pump liquid assembly 34 includes an injection pump 341 and a third valve body 342. The third valve body 342 is arranged between the injection pump 341 and the second liquid inlet 312 to realize the connection and disconnection between the injection pump 341 and the second liquid inlet 312. A pressure gauge 50 is provided on the ventilation main pipe 221. The pressure gauge 50 is used to measure the air pressure inside the ventilation main pipe 221, ensure the vacuum degree after the vacuum operation and monitor the air pressure in real time to ensure the smooth progress of the injection operation.

[0044] It should be noted that in the above embodiment, during the vacuum operation, the gas inside the liquid filling cup 21 and the battery 10 needs to be evacuated until the air pressure value is -98 kPa, but it is not limited to this. It is set according to the injection requirements of different batteries 10, which will not be repeated here. In addition, before performing the injection operation, the injection equipment needs to be adjusted, such as fine-tuning the position of the turntable 40 and the liquid filling cup 21, maintaining the parallelism of the turntable 40, and checking whether each liquid circuit and gas circuit is installed tightly and leaks, which will not be repeated here.

[0045] On the other hand, the present application also discloses a battery production line, including any one of the aforementioned liquid injection devices, the production line also including a loading device, a weighing device and a unloading device, the loading device delivers the battery 10 to be injected to the above-mentioned liquid injection device (loading station 60), the above-mentioned weighing device performs a first weighing on the battery 10 before injection, and a second weighing on the battery 10 after injection, so as to obtain the weight of the injected electrolyte, and finally the unloading device is used to move the battery 10 after injection out of the injection device.

[0046] The above is a detailed introduction to the liquid injection equipment and battery production line provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the present application and its core ideas. At the same time, for those skilled in the art, according to the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A liquid injection device for injecting electrolyte into a battery (10), wherein the battery (10) is provided with a liquid injection port (11), characterized in that: The liquid injection equipment comprises: The liquid injection mechanism (20) comprises a liquid injection cup (21) and an air source assembly (22), wherein the liquid injection cup (21) has a first liquid injection nozzle (211), a first liquid inlet (212) and an air vent (213), wherein the first liquid injection nozzle (211) is used to dock with the liquid injection port (11), and the air source assembly (22) is connected to the air vent (213), and the air source assembly (22) is used to control the air pressure in the liquid injection cup (21) to switch between positive pressure and negative pressure; and The liquid supply mechanism (30) comprises a buffer cup (31), a first valve body (32), a second liquid injection nozzle (33) and a liquid pumping assembly (34); the buffer cup (31) has a liquid outlet (311) and a second liquid inlet (312); the liquid pumping assembly (34) is connected to the second liquid inlet (312); the first valve body (32) is connected between the liquid outlet (311) and the second liquid injection nozzle (33) to selectively connect or block the liquid outlet (311) and the second liquid injection nozzle (33); the second liquid injection nozzle (33) is connected to the first liquid inlet (212).

2. The liquid injection device according to claim 1, characterized in that: The air source assembly (22) comprises a ventilation main pipe (221), a positive pressure sub-pipe (222), a negative pressure sub-pipe (223) and a second valve body (224); the positive pressure sub-pipe (222) and the negative pressure sub-pipe (223) are respectively connected to one end of the ventilation main pipe (221); the other end of the ventilation main pipe (221) is connected to the vent (213); the positive pressure sub-pipe (222) is used to connect to a positive pressure air source (226); the negative pressure sub-pipe (223) is used to connect to a negative pressure air source (227); the second valve body (224) is arranged on the ventilation main pipe (221), the positive pressure sub-pipe (222) and the negative pressure sub-pipe (223) to selectively open or close the ventilation main pipe (221), the positive pressure sub-pipe (222) and the negative pressure sub-pipe (223).

3. The liquid injection device according to claim 1, characterized in that: The liquid injection mechanism (20) further comprises a first driving structure, wherein the first driving structure is used to drive the first liquid injection nozzle (211) to selectively block or open the liquid injection port (11); The liquid supply mechanism (30) further comprises a second driving structure, wherein the second driving structure is used to drive the second liquid injection nozzle (33) to selectively block or open the first liquid inlet (212).

4. The liquid injection device according to claim 3, characterized in that: The liquid injection device also includes a turntable (40) and a third driving structure. A plurality of workstations are spaced apart along the circumference of the turntable (40), each of the workstations being provided with the liquid injection mechanism (20). The third driving structure is used to drive the turntable (40) to rotate so that the first liquid inlet (212) in each of the liquid injection mechanisms (20) is sequentially docked with the second liquid injection nozzle (33) in the liquid supply mechanism (30) to inject liquid into the liquid injection cup (21).

5. The liquid injection device according to claim 4, characterized in that: Each of the workstations is also provided with a blocking block (41) and a fourth driving structure, wherein the fourth driving structure is used to drive the blocking block (41) to selectively block or open the first liquid inlet (212).

6. The liquid injection device according to claim 4, characterized in that: The air source assembly comprises a ventilation main pipe (221), a positive pressure sub-pipe (222), a negative pressure sub-pipe (223), an air slip ring (225) and a second valve body (224); the positive pressure sub-pipe (222) and the negative pressure sub-pipe (223) are respectively connected to one end of the ventilation main pipe (221) through the air slip ring (225); the other end of the ventilation main pipe (221) is connected to the vent (213); the positive pressure sub-pipe (222) is used to connect the positive pressure sub-pipe (222) and the negative pressure sub-pipe (223) to the vent (213); The positive pressure sub-tube (223) is connected to a positive pressure gas source (226); the negative pressure sub-tube (223) is used to connect to a negative pressure gas source (227); the ventilation main pipe (221) rotates with the turntable (40); and the second valve body (224) is arranged on the ventilation main pipe (221), the positive pressure sub-tube (222) and the negative pressure sub-tube (223) to selectively open or block the ventilation main pipe (221), the positive pressure sub-tube (222) and the negative pressure sub-tube (223).

7. The liquid injection device according to claim 1, characterized in that: The pump assembly (34) comprises an injection pump (341) and a third valve body (342), wherein the third valve body (342) is arranged between the injection pump (341) and the second liquid inlet (312) to selectively connect or block the injection pump (341) and the second liquid inlet (312).

8. The liquid injection device according to claim 2, characterized in that: The ventilation main pipe (221) is connected to a pressure gauge (50) to measure the air pressure inside the ventilation main pipe (221).

9. The liquid injection device according to claim 5, characterized in that: Along the rotation direction of the turntable (40), the plurality of workstations are, in sequence, a loading and unloading workstation (60), a vacuum preparation workstation (61), a liquid inlet workstation (62), an enhanced liquid inlet workstation (63), and a residual liquid workstation (64).

10. A battery production line, characterized in that: The liquid injection device comprises the liquid injection device as described in any one of claims 1 to 9, and the production line further comprises a loading device, a weighing device and a unloading device, wherein the loading device is used to deliver the battery to be injected with liquid to the liquid injection device, the weighing device is used to weigh the battery before and after the injection, respectively, and the unloading device is used to move the battery that has completed the injection out of the liquid injection device.

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