Liquid injection device of power battery

Abstract

The utility model relates to the technical field of battery processing equipment, in particular to a liquid injection device of a power battery, which is characterized in that a mounting frame is arranged on a lifting plate, and a plurality of liquid injection mechanisms for injecting electrolyte into the power battery are arranged on the mounting frame; a supporting frame is further fixedly arranged on the lifting plate, a plurality of second air cylinders with telescopic rods arranged downwards are arranged on the supporting frame, the second air cylinders correspond to the liquid injection mechanisms one to one, and mounting pieces arranged above the liquid injection mechanisms are arranged at the ends of the telescopic rods of the second air cylinders correspondingly. The installation part is provided with an inflation head used for inflating the liquid injection mechanism and a connecting valve used for being connected with an air pump, and the connecting valve communicates with the inflation head. The liquid injection mechanism is filled with gas through the gas filling head, so that electrolyte in the liquid injection mechanism is extruded into the power battery, automatic liquid injection treatment of the power battery is realized, and the processing efficiency of the power battery is improved; moreover, liquid injection treatment can be performed on a plurality of power batteries at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of battery processing equipment, in particular to a liquid injection device for power batteries. Background Technique

[0002] A power battery is a power source that provides power for tools, mostly referring to a storage battery that provides power for electric vehicles, electric trains, electric bicycles, and golf carts. At present, the power batteries of electric vehicles on the market are mainly lithium-ion batteries. The liquid injection process is particularly important in the production process of lithium-ion batteries. Among them, there is a specific liquid injection device for lithium-ion batteries as follows:

[0003] The Chinese patent document with the publication number CN107394106A discloses a liquid injection device for lithium-ion power batteries, specifically including: a fixed seat, a support frame, a guiding component, a clamping component, and a liquid injection cup. The battery is arranged in the fixed seat. The support frame is installed above the fixed seat. The guiding component and the clamping component are installed between the fixed seat and the support frame. An installation hole is provided on the support frame. The liquid injection cup includes a cup body, an elastic component, a liquid injection nozzle, and a sealing ring. The elastic component, the liquid injection nozzle, and the sealing ring are sequentially sleeved on the bottom end of the cup body. The liquid injection cup is installed through the installation hole. The sealing ring is located below the support frame and corresponds to the liquid injection hole of the battery in the vertical direction.

[0004] As can be seen from the above, the existing liquid injection device first manually places the battery into the fixed seat and positions it properly, and then manually presses down the support frame until the sealing ring contacts the liquid injection port of the battery. Then, a fixed amount of electrolyte is injected into the liquid injection cup, and the liquid injection device is manually lifted and placed into the oven for vacuum pumping and baking, so that the electrolyte naturally flows into the battery from the liquid injection port to complete the liquid injection. However, the existing liquid injection device cannot realize automatic liquid injection processing, which affects the processing efficiency of lithium-ion batteries. Therefore, a liquid injection device for power batteries is provided to solve the above technical problems. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a liquid injection device for power batteries aiming at the deficiencies of the prior art, so as to solve the technical problem that the existing liquid injection device cannot realize automatic liquid injection processing.

[0006] To achieve the above purpose, the technical solution of the utility model is as follows:

[0007] A liquid injection device for power batteries includes a bottom plate. A plurality of vertically arranged support rods are provided on the bottom plate, and a lifting plate that slides up and down is provided on the support rods.

[0008] The lifting plate is provided with an installation frame, and a number of liquid injection mechanisms for injecting electrolyte into the power battery are installed on the installation frame; a support frame is also fixedly arranged on the lifting plate, and a number of second cylinders with telescopic rods arranged downward are installed on the support frame. The second cylinders correspond to the liquid injection mechanisms one by one, and an installation part is installed at the end of the telescopic rod of each second cylinder and is located above the liquid injection mechanism. An inflation head for inflating the inside of the liquid injection mechanism and a connection valve for connecting to an air pump are arranged on the installation part, and the connection valve is communicated with the inflation head.

[0009] Furthermore, a liquid supplement port and a sealing mechanism for sealing the liquid supplement port are arranged on each liquid injection mechanism; a liquid supplement mechanism for supplementing electrolyte from the liquid supplement port into the liquid injection mechanism is installed on the support frame.

[0010] Furthermore, a movable plate is slidably arranged horizontally on the bottom plate, and a feeding frame for loading a number of power batteries is installed on the movable plate. The power batteries loaded in the feeding frame are arranged side by side and correspond to a number of liquid injection mechanisms one by one; a third cylinder with a horizontally arranged length direction is installed on the bottom plate, and the end of the telescopic rod of the third cylinder is fixedly arranged with the movable plate.

[0011] Furthermore, the liquid injection mechanism includes a cup body. The bottom of the cup body is filled with a first filling block, and the top is filled with a second filling block. A liquid storage chamber for storing electrolyte is formed between the first filling block and the second filling block. The liquid supplement port is arranged on the side wall of the cup body and is communicated with the liquid storage chamber; a connecting pipe is slidably arranged up and down in the second filling block. The top end of the connecting pipe is an air inlet, and the air inlet extends to the outside of the cup body and is used for airtight connection with the inflation head. An air outlet communicated with the air inlet is arranged beside the connecting pipe; a gas guiding channel for communicating with the air outlet on the downward-sliding connecting pipe is formed in the second filling block, and the gas guiding channel is communicated with the liquid storage chamber; a movable rod is slidably arranged up and down in the first filling block, and the movable rod is fixedly arranged with the connecting pipe; a second liquid guiding channel is arranged at the bottom end of the movable rod, and the liquid inlet of the second liquid guiding channel is arranged beside the movable rod, and the liquid outlet is arranged at the bottom of the movable rod; a first liquid guiding channel for communicating with the liquid inlet of the second liquid guiding channel on the downward-sliding movable rod is formed in the first filling block, and the first liquid guiding channel is communicated with the liquid storage chamber. A liquid injection head for communicating with the liquid outlet of the second liquid guiding channel on the downward-sliding movable rod is installed at the bottom of the cup body.

[0012] Furthermore, a guiding cylinder sleeved outside the connecting pipe is arranged at the top of the cup body, and a sliding block is fixedly arranged on the side wall of the connecting pipe outside the cup body. The sliding block is slidably arranged in the guiding cylinder, and a first spring is also arranged in the guiding cylinder. The first spring is located on the side of the sliding block close to the cup body to apply an upward force to the sliding block.

[0013] Furthermore, the sealing mechanism includes a seal member that is slidably disposed up and down on the outer side of the cup body and is used to seal the liquid replenishing port. A rubber ring is provided at the gap between the seal member and the outer side of the cup body. A second spring is sleeved on the outer side of the cup body, and the second spring is disposed between the seal member and the mounting frame to apply an upward thrust to the seal member. A fourth cylinder with a telescopic rod facing downward is installed on the support frame, and a pressing frame for pushing the seal member to slide downward is provided at the end of the telescopic rod of the fourth cylinder.

[0014] Furthermore, the liquid replenishing mechanism includes a fixing frame provided on the support frame and a fixing block provided on the fixing frame. A sliding frame is slidably disposed obliquely on the fixing block. A plurality of liquid replenishing needle tubes are installed on the sliding frame and are respectively aligned with different liquid replenishing ports and arranged obliquely downward. A fifth cylinder with a length direction consistent with the sliding direction of the sliding frame is also installed on the fixing frame, and the end of the telescopic rod of the fifth cylinder is fixedly provided with the sliding frame.

[0015] Furthermore, the sliding direction of the sliding frame forms an angle of 45° with the horizontal plane.

[0016] Furthermore, a second liquid collecting tank for preventing the liquid replenishing needle tubes from dripping is also installed on the support frame, and the second liquid collecting tank is disposed directly below the liquid replenishing needle tubes.

[0017] The beneficial effects of the present utility model are as follows: After placing a plurality of power batteries that have been evacuated under the liquid injection mechanism (the power batteries correspond to the liquid injection mechanism one by one), operate the first cylinder to control the lifting plate to move downward, thereby driving the liquid injection mechanism to move downward together, so that the liquid injection end of the liquid injection mechanism extends into the liquid injection port of the power battery. Subsequently, operate the second cylinder to control the inflation head to move downward, so that the inflation head is hermetically connected to the liquid injection mechanism. At the same time of hermetic connection, the inflation head is communicated with the liquid injection mechanism. Finally, operate the air pump to fill the gas into the liquid injection mechanism through the inflation head, so as to extrude the electrolyte in the liquid injection mechanism into the power battery, realizing the automatic liquid injection treatment of the power battery, improving the processing efficiency of the power battery; and multiple power batteries can be subjected to liquid injection treatment simultaneously. Description of the Drawings

[0018] Figure 1 It is a three-dimensional structure diagram of the present utility model.

[0019] Figure 2 It is a three-dimensional structure diagram of another perspective of the present utility model.

[0020] Figure 3 It is a structure diagram of the sealing mechanism of the present utility model.

[0021] Figure 4 It is an internal structure diagram of the liquid injection mechanism of the present utility model.

[0022] Figure 5This is a schematic diagram of the internal structure of another perspective of the liquid injection mechanism of the present utility model.

[0023] Figure 6 This is a schematic diagram of the air guiding part structure of the liquid injection mechanism of the present utility model.

[0024] Figure 7 This is a schematic diagram of the liquid guiding part structure of the liquid injection mechanism of the present utility model.

[0025] Figure 8 This is a schematic diagram of the structure of the liquid replenishing mechanism of the present utility model.

[0026] Reference numerals include:

[0027] 1. Bottom plate; 2. Support rod; 3. Lifting plate; 4. First cylinder; 5. Installation frame; 6. Liquid injection mechanism; 61. Cup body; 62. First filling block; 63. Liquid storage chamber; 64. Connecting pipe; 641. Air inlet; 642. Air outlet; 65. Guide cylinder; 66. Slide block; 67. First spring; 68. Second filling block; 69. Air guiding channel; 610. Moving rod; 611. First liquid guiding channel; 612. Second liquid guiding channel; 613. Liquid injection head; 614. Liquid replenishing port; 7. Support frame; 8. Second cylinder; 9. Installation part; 10. Inflating head; 11. Connecting valve; 12. Discharge frame; 13. Movable plate; 14. Third cylinder; 15. Sealing mechanism; 151. Sealing member; 152. Rubber ring; 153. Second spring; 154. Fourth cylinder; 155. Pressing frame; 16. Liquid replenishing mechanism; 161. Fixed frame; 162. Fixed block; 163. Sliding frame; 164. Liquid replenishing needle tube; 165. Fifth cylinder; 17. First liquid collecting tank; 18. Second liquid collecting tank; 19. Positioning column; 20. Positioning sleeve. Detailed implementation manners

[0028] The following describes in detail a liquid injection device for a power battery of the present utility model with reference to the accompanying drawings.

[0029] As Figure 1-2As shown in the figure, an embodiment of a liquid injection device for a power battery of the present utility model includes a bottom plate 1 for supporting the entire device. A plurality of vertically arranged support rods 2 are provided on the bottom plate 1, and a lifting plate 3 is slidably arranged on the support rods 2. Under the action of the vertically arranged support rods 2, the lifting plate 3 can move up and down. A first cylinder 4 with a telescopic rod facing upward is also installed on the bottom plate 1. The end of the telescopic rod of the first cylinder 4 is connected to the lifting plate 3. By operating the first cylinder 4, the lifting plate 3 is controlled to move up and down. Among them, an installation frame 5 is installed on the lifting plate 3, and a plurality of liquid injection mechanisms 6 for injecting electrolyte into the power battery are installed on the installation frame 5. In addition, a support frame 7 is fixedly installed on the lifting plate 3, and a plurality of second cylinders 8 with telescopic rods facing downward are installed on the support frame 7. The second cylinders 8 correspond to the liquid injection mechanisms 6 one by one, and an installation part 9 is installed at the end of the telescopic rod of each second cylinder 8. An inflation head 10 for inflating the inside of the liquid injection mechanism 6 and a connection valve 11 for connecting to an air pump are provided on the installation part 9. The connection valve 11 is communicated with the inflation head 10.

[0030] Specifically, after placing a plurality of evacuated power batteries directly below the liquid injection mechanism 6 (the power batteries correspond to the liquid injection mechanisms 6 one by one), operate the first cylinder 4 to control the lifting plate 3 to move downward, thereby driving the liquid injection mechanism 6 to move downward together, so that the liquid injection end of the liquid injection mechanism 6 extends into the liquid injection port of the power battery. Subsequently, operate the second cylinder 8 to control the inflation head 10 to move downward, so that the inflation head 10 is hermetically connected to the liquid injection mechanism 6. Finally, operate the air pump, and fill the liquid injection mechanism 6 with gas through the inflation head 10 to extrude the electrolyte in the liquid injection mechanism 6 into the power battery, realizing automatic liquid injection treatment of the power battery.

[0031] In order to place a plurality of evacuated power batteries at the designated liquid injection positions simultaneously, a movable plate 13 is slidably arranged horizontally on the bottom plate 1. A feeding frame 12 for loading a plurality of power batteries is installed on the movable plate 13. The power batteries filled in the feeding frame 12 are arranged side by side and correspond to a plurality of liquid injection mechanisms 6 one by one. After injecting electrolyte into the power battery through the liquid injection mechanism 6, the movable plate 13 can be controlled to move, so as to drive the feeding frame 12 to move away from below the liquid injection mechanism 6, which is convenient for taking out the power battery, and is also convenient for placing the power battery to be liquid-injected in the feeding frame 12, and then controlling the movable plate 13 to move to drive a plurality of power batteries to align with the liquid injection mechanism 6. In addition, a third cylinder 14 with a horizontally arranged length direction is installed on the bottom plate 1, and the end of the telescopic rod of the third cylinder 14 is fixedly arranged with the movable plate 13. By operating the third cylinder 14, the movable plate 13 is driven to move.

[0032] When the electrolyte in the liquid injection mechanism 6 is used up, it is necessary to replenish the liquid inside it. To achieve automatic liquid replenishment, a liquid replenishment port 614 is provided on the liquid injection mechanism 6, and the electrolyte can be poured into the liquid injection mechanism 6 through the liquid replenishment port 614. Additionally, a sealing mechanism 15 for sealing the liquid replenishment port 614 is also provided on the liquid injection mechanism 6. When liquid replenishment is required, the sealing mechanism 15 is operated to connect the liquid replenishment port 614 with the outside world, and then the liquid injection mechanism 6 can be replenished with liquid. After the liquid replenishment is completed, the sealing mechanism 15 is operated to reset and seal the liquid replenishment port 614 again. Under the action of the sealing mechanism 15, after the inflation head 10 fills the gas into the liquid injection mechanism 6, the gas will not leak out from the liquid replenishment port 614. A liquid replenishment mechanism 16 for replenishing the electrolyte from the liquid replenishment port 614 into the liquid injection mechanism 6 is installed on the support frame 7. After operating the sealing mechanism 15 to connect the liquid replenishment port 614 with the outside world, the liquid replenishment mechanism 16 can be operated to achieve automatic liquid replenishment treatment for the inside of the liquid injection mechanism 6.

[0033] Additionally, a number of positioning columns 19 are installed on the top of the material discharge frame 12, and a number of positioning sleeves 20 for docking with the positioning columns 19 are installed on the lifting plate 3. When the third cylinder 14 drives the movable plate 13 to move to a specified position, the power battery in the material discharge frame 12 is placed at the liquid injection position, and the positioning columns 19 are aligned with the positioning sleeves 20. Subsequently, during the process of the first cylinder 4 controlling the lifting plate 3 to move downward, the positioning columns 19 are inserted into the positioning sleeves 20 to position the material discharge frame 12. Under the action of the positioning columns 19 and the positioning sleeves 20, the liquid injection mechanism 6 can accurately align with the power battery.

[0034] Such as Figure 4-7As shown in the figure, the liquid injection mechanism 6 includes a cup body 61. The bottom inside the cup body 61 is filled with a first filling block 62, and the top inside is filled with a second filling block 68. A liquid storage chamber 63 for storing electrolyte is formed between the first filling block 62 and the second filling block 68. A liquid replenishing port 614 is provided on the side wall of the cup body 61 and is communicated with the liquid storage chamber 63. The liquid replenishing mechanism 16 replenishes the electrolyte into the liquid storage chamber 63 through the liquid replenishing port 614. Among them, a connecting pipe 64 is slidably arranged up and down in the second filling block 68. The top end of the connecting pipe 64 is an air inlet 641, and the air inlet 641 extends to the outside of the cup body 61 and is used for airtight connection with the inflating head 10. An air outlet 642 communicated with the air inlet 641 is arranged beside the connecting pipe 64. A gas guiding channel 69 for communicating with the air outlet 642 on the downward-sliding connecting pipe 64 is formed in the second filling block 68, and the gas guiding channel 69 is communicated with the liquid storage chamber 63. Operate the second cylinder 8 to control the downward movement of the inflating head 10, so that the inflating head 10 is inserted into the air inlet 641 to complete the airtight connection. Then the second cylinder 8 continues to control the downward movement of the inflating head 10 to push the connecting pipe 64 downward. After the gas guiding channel 69 is communicated with the air outlet 642, the second cylinder 8 stops operating. Finally, the inflating head 10 fills the gas. The gas first enters from the air inlet 641, then enters the gas guiding channel 69 from the air outlet 642, and finally is filled into the liquid storage chamber 63 to extrude the electrolyte in the liquid storage chamber 63.

[0035] After the connecting pipe 64 moves downward, in order to enable the connecting pipe 64 to automatically reset upward, a guiding cylinder 65 sleeved outside the connecting pipe 64 is provided at the top of the cup body 61. A slider 66 is fixedly arranged on the side wall of the connecting pipe 64 outside the cup body 61, and the slider 66 is slidably arranged in the guiding cylinder 65. A first spring 67 is also arranged in the guiding cylinder 65, and the first spring 67 is placed on the side of the slider 66 close to the cup body 61 to apply an upward force to the slider 66. When the connecting pipe 64 is pushed downward, the slider 66 moves downward together in the guiding cylinder 65, and the first spring 67 is compressed. When the force applied to the connecting pipe 64 stops, under the action of the compressed first spring 67, the connecting pipe 64 is pushed to reset upward, and the air outlet 642 is staggered from the gas guiding channel 69 again.

[0036] A movable rod 610 is provided inside the first filling block 62 and can slide up and down. The movable rod 610 is fixedly arranged with the connecting pipe 64. When the connecting pipe 64 moves up and down, the movable rod 610 will move up and down together with it. A second liquid guiding channel 612 is provided at the bottom end of the movable rod 610. The liquid inlet of the second liquid guiding channel 612 is arranged beside the movable rod 610, and the liquid outlet is arranged at the bottom of the movable rod 610. A first liquid guiding channel 611 for communicating with the liquid inlet of the second liquid guiding channel 612 on the movable rod 610 after it slides down is formed inside the first filling block 62. The first liquid guiding channel 611 is communicated with the liquid storage chamber 63. A liquid injection head 613 for communicating with the liquid outlet of the second liquid guiding channel 612 on the movable rod 610 after it slides down is installed at the bottom of the cup body 61. When the connecting pipe 64 drives the movable rod 610 to move down to a specified position together, the air guiding channel 69 is communicated with the air outlet 642. At the same time, the liquid inlet of the second liquid guiding channel 612 is communicated with the first liquid guiding channel 611, and the liquid outlet of the second liquid guiding channel 612 is communicated with the liquid injection head 613. When the gas is filled by the gas filling head 10, the gas first enters from the gas inlet 641, then enters the air guiding channel 69 from the air outlet 642, and finally is filled into the liquid storage chamber 63 to squeeze the electrolyte in the liquid storage chamber 63. The electrolyte enters the second liquid guiding channel 612 through the first liquid guiding channel 611 and is finally injected into the power battery through the liquid injection head 613, that is, the automatic liquid injection treatment of the power battery is realized. In addition, when the force applied to the connecting pipe 64 is stopped, under the action of the compressed first spring 67, the connecting pipe 64 is pushed to reset upward. The connecting pipe 64 drives the movable rod 610 to reset upward together, and the air outlet 642 is staggered from the air guiding channel 69 again, and the second liquid guiding channel 612 is staggered from the first liquid guiding channel 611. When liquid injection is not required, the electrolyte will not leak from the liquid injection head 613. Additionally, a first liquid collecting tank 17 for collecting the dripping liquid on the liquid injection head 613 is installed on the movable plate 13. When the power battery is filled with liquid, the movable plate 13 is controlled to move, so as to drive the feeding frame 12 to move away from the lower part of the liquid injection head 613. At the same time, the first liquid collecting tank 17 is driven to be placed directly below the liquid injection head 613, and the residual dripping liquid on the liquid injection head 613 will drip onto the first liquid collecting tank 17 to prevent the leakage of the electrolyte.

[0037] Such as Figure 3As shown, the sealing mechanism 15 includes a seal 151 that is slidably arranged up and down on the outer side of the cup body 61 and is used to seal the liquid replenishing port 614. Seals 151 are slidably arranged up and down on the outer sides of each cup body 61. Among them, a rubber ring 152 is provided at the gap between the seal 151 and the outer side of the cup body 61. Under the action of the rubber ring 152, the sealing effect of the seal 151 is further improved. A second spring 153 is sleeved on the outer side of the cup body 61, and the second spring 153 is placed between the seal 151 and the mounting frame 5 to apply an upward thrust to the seal 151. After applying a downward force to the seal 151, the seal 151 slides downward on the cup body 61, so that the liquid replenishing port 614 communicates with the outside, and the second spring 153 is compressed. Then, the liquid replenishing mechanism 16 can be operated to replenish the liquid in the cup body 61; when the liquid injection is completed, the force applied to the seal 151 is stopped. Under the action of the compressed spring, the seal 151 is pushed to reset to seal the liquid replenishing port 614 again. In order to apply a downward force to the seal 151, a fourth cylinder 154 with a telescopic rod arranged downward is installed on the support frame 7, and a pressing frame 155 for pushing the seal 151 to slide downward is provided at the end of the telescopic rod of the fourth cylinder 154; when the fourth cylinder 154 is operated, the pressing frame 155 can be driven to move downward, and the pressing frame 155 simultaneously pushes the seals 151 arranged on different cup bodies 61 to slide downward, so that the liquid replenishing ports 614 on each cup body 61 communicate with the outside at the same time, facilitating the subsequent liquid replenishing mechanism 16 to replenish the liquid in multiple cup bodies 61 at the same time.

[0038] As Figure 8As shown in the figure, the liquid replenishing mechanism 16 includes a fixing frame 161 provided on the support frame 7 and a fixing block 162 provided on the fixing frame 161. Among them, a sliding frame 163 is inclined and slidably provided on the fixing block 162. The sliding direction of the sliding frame 163 forms an angle of 45° with the horizontal plane. A number of liquid replenishing needle tubes 164 are arranged obliquely downward on the sliding frame 163 and are respectively aligned with different liquid replenishing ports 614. A fifth air cylinder 165 with a length direction consistent with the sliding direction of the sliding frame 163 is also provided on the fixing frame 161, and the end of the telescopic rod of the fifth air cylinder 165 is fixedly arranged with the sliding frame 163. When liquid replenishment is required, first apply a downward force to the sealing member 151 by pressing the frame 155, so that the liquid replenishing port 614 communicates with the outside. Then, operate the fifth air cylinder 165 to push the sliding frame 163 to move obliquely downward in the direction of the liquid replenishing port 614, thereby driving a number of liquid replenishing needle tubes 164 to extend into different liquid replenishing ports 614. The liquid replenishing needle tubes 164 are connected to a liquid supply mechanism (not shown in the figure) for supplying electrolyte. Operate the liquid supply mechanism, and the electrolyte is replenished into the cup body 61 through the liquid replenishing needle tubes 164 to realize automatic replenishment of the electrolyte. After the replenishment is completed, the fifth air cylinder 165 drives the sliding frame 163 to reset, and the pressing frame 155 and the sealing member 151 reset upward to seal the liquid replenishing port 614 again. Additionally, a second liquid collecting groove 18 for preventing the liquid dripping from the liquid replenishing needle tubes 164 is also provided on the support frame 7. The second liquid collecting groove 18 is placed directly below the liquid replenishing needle tubes 164. When the liquid replenishing needle tubes 164 complete the electrolyte replenishment and are in the initial position, the electrolyte dripping from the liquid replenishing needle tubes 164 is collected by the second liquid collecting groove 18, which not only prevents the leakage of the electrolyte but also reduces the cost.

[0039] In summary, it can be seen that the present utility model has the excellent characteristics described above, enabling it to enhance the efficiency that has never been achieved in the prior art during use and having practicality, thus becoming a product with extremely high practical value.

[0040] The above content is only the preferred embodiment of the present utility model. For those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. The content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A liquid injection device for a power battery, characterized in that: It includes a bottom plate (1), on which several vertically arranged support rods (2) are provided, and a lifting plate (3) that slides up and down is provided on the support rods (2); An installation frame (5) is installed on the lifting plate (3), and several liquid injection mechanisms (6) for injecting electrolyte into the power battery are installed on the installation frame (5); A support frame (7) is also fixedly provided on the lifting plate (3), and several second cylinders (8) with telescopic rods arranged downward are installed on the support frame (7). The second cylinders (8) correspond to the liquid injection mechanisms (6) one by one, and an installation member (9) placed above the liquid injection mechanism (6) is installed at the end of the telescopic rod of each second cylinder (8). An inflation head (10) for inflating the inside of the liquid injection mechanism (6) and a connection valve (11) for connecting to an air pump are provided on the installation member (9), and the connection valve (11) is communicated with the inflation head (10).

2. The liquid injection device for a power battery according to claim 1, wherein: A liquid replenishment port (614) and a sealing mechanism (15) for sealing the liquid replenishment port (614) are provided on each liquid injection mechanism (6); A liquid replenishment mechanism (16) for replenishing electrolyte from the liquid replenishment port (614) into the liquid injection mechanism (6) is installed on the support frame (7).

3. The liquid injection device for a power battery according to claim 1, characterized in that: A movable plate (13) is horizontally slidably provided on the bottom plate (1), and a blanking frame (12) for loading several power batteries is installed on the movable plate (13). The power batteries loaded in the blanking frame (12) are arranged side by side and correspond to several liquid injection mechanisms (6) one by one; A third cylinder (14) with a horizontally arranged length direction is installed on the bottom plate (1), and the end of the telescopic rod of the third cylinder (14) is fixedly provided with the movable plate (13).

4. The liquid injection device for a power battery according to claim 2, characterized in that: The liquid injection mechanism (6) includes a cup body (61). The bottom inside the cup body (61) is filled with a first filling block (62), and the top inside is filled with a second filling block (68). A liquid storage chamber (63) for storing electrolyte is formed between the first filling block (62) and the second filling block (68). A liquid replenishing port (614) is arranged on the side wall of the cup body (61) and is communicated with the liquid storage chamber (63). A connecting pipe (64) is slidably arranged up and down inside the second filling block (68). The top end of the connecting pipe (64) is an air inlet (641), and the air inlet (641) extends to the outside of the cup body (61) and is used for airtight connection with the inflation head (10). An air outlet (642) communicated with the air inlet (641) is arranged beside the connecting pipe (64). A gas guiding channel (69) for communicating with the air outlet (642) on the downward-sliding connecting pipe (64) is formed inside the second filling block (68), and the gas guiding channel (69) is communicated with the liquid storage chamber (63). A movable rod (610) is slidably arranged up and down inside the first filling block (62), and the movable rod (610) is fixedly arranged with the connecting pipe (64). A second liquid guiding channel (612) is arranged at the bottom end of the movable rod (610), and the liquid inlet of the second liquid guiding channel (612) is arranged beside the movable rod (610), and the liquid outlet is arranged at the bottom of the movable rod (610). A first liquid guiding channel (611) for communicating with the liquid inlet of the second liquid guiding channel (612) on the downward-sliding movable rod (610) is formed inside the first filling block (62), and the first liquid guiding channel (611) is communicated with the liquid storage chamber (63). A liquid injection head (613) for communicating with the liquid outlet of the second liquid guiding channel (612) on the downward-sliding movable rod (610) is arranged at the bottom of the cup body (61).

5. The liquid injection device for a power battery according to claim 4, characterized in that: A guiding cylinder (65) sleeving the outside of the connecting pipe (64) is arranged at the top of the cup body (61). A slider (66) is fixedly arranged on the side wall of the connecting pipe (64) outside the cup body (61), and the slider (66) is slidably arranged inside the guiding cylinder (65). A first spring (67) is further arranged inside the guiding cylinder (65), and the first spring (67) is arranged on the side of the slider (66) close to the cup body (61) to apply an upward force to the slider (66).

6. The liquid injection device for a power battery according to claim 4, characterized in that: The sealing mechanism (15) includes a seal (151) slidably arranged up and down outside the cup body (61) and used for sealing the liquid replenishing port (614). A rubber ring (152) is arranged at the gap between the seal (151) and the outside of the cup body (61). A second spring (153) is sleeved outside the cup body (61), and the second spring (153) is arranged between the seal (151) and the mounting frame (5) to apply an upward thrust to the seal (151). A fourth cylinder (154) with a telescopic rod arranged downward is arranged on the support frame (7), and a pressing frame (155) for pushing the seal (151) to slide downward is arranged at the end of the telescopic rod of the fourth cylinder (154).

7. The liquid injection device for a power battery according to claim 2, characterized in that: The liquid replenishing mechanism (16) includes a fixing frame (161) provided on the support frame (7) and a fixing block (162) provided on the fixing frame (161). A sliding frame (163) is inclined and slidably provided on the fixing block (162). A plurality of liquid replenishing needle tubes (164) are arranged obliquely downward and respectively aligned with different liquid replenishing ports (614) on the sliding frame (163). A fifth cylinder (165) with a length direction consistent with the sliding direction of the sliding frame (163) is also provided on the fixing frame (161), and the end of the telescopic rod of the fifth cylinder (165) is fixedly arranged with the sliding frame (163).

8. The liquid injection device for a power battery according to claim 7, characterized in that: The sliding direction of the sliding frame (163) forms an angle of 45° with the horizontal plane.

9. The liquid injection device for a power battery according to claim 7, characterized in that: A second liquid collecting tank (18) for preventing the liquid replenishing needle tube (164) from dripping is also provided on the support frame (7), and the second liquid collecting tank (18) is placed directly below the liquid replenishing needle tube (164).

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