A liquid injection device for an electric cell

Abstract

The utility model relates to the technical field of battery discloses a kind of battery cell liquid injection device, with gas circuit interface, high-speed liquid inlet, high-precision liquid inlet, liquid injection port and cavity, high-speed liquid inlet, high-precision liquid inlet, liquid injection port, gas circuit interface are connected with cavity respectively, gas circuit pipe, gas circuit pipe is connected with gas circuit interface, first liquid injection component, including first liquid injection pipe, first liquid flowmeter and first liquid injection pump, first liquid injection pump is connected with first liquid flowmeter, the first end of first liquid injection pipe is connected with first liquid injection pump, the second end of first liquid injection pipe is connected with high-speed liquid inlet;Second liquid injection component, including second liquid injection pipe, second liquid flowmeter and second liquid injection pump, second liquid injection pump is connected with second liquid flowmeter, the first end of first liquid injection pipe is connected with second liquid injection pump, the second end of first liquid injection pipe is connected with high-precision liquid inlet.The battery cell liquid injection device of the utility model guarantees to reduce liquid injection bad rate under the condition of high-speed liquid injection.

Description

Technical Field

[0001] This utility model relates to the technical field of batteries, and in particular to a battery cell liquid injection device. Background Technology

[0002] In lithium battery production, the electrolyte injection process involves injecting electrolyte into the battery cell. Precise control of the electrolyte during injection is crucial to ensure consistent cell performance. Current injection methods primarily utilize metering pumps to deliver electrolyte into the cell via pipelines, employing positive and negative pressure circulation to gradually introduce the electrolyte. However, during high-speed injection, the accuracy decreases with increasing speed, potentially leading to injection defects. Utility Model Content

[0003] The aim is to solve at least one of the technical problems existing in the prior art. This utility model provides a battery cell liquid injection device that reduces the liquid injection failure rate while ensuring high-speed liquid injection.

[0004] To achieve the above objectives, this utility model provides a battery cell liquid injection device, including an injection cup, which is equipped with an air passage interface, a high-speed liquid inlet, a high-precision liquid inlet, an injection port, and a cavity. The high-speed liquid inlet, the high-precision liquid inlet, the injection port, and the air passage interface are respectively connected to the cavity. The air passage pipe is connected to the air passage interface. The first liquid injection assembly includes a first liquid injection pipe, a first liquid flow meter, and a first liquid injection pump. The first liquid injection pump is connected to the first liquid flow meter, the first end of the first liquid injection pipe is connected to the first liquid injection pump, and the second end of the first liquid injection pipe is connected to the high-speed liquid inlet. The second injection assembly includes a second injection pipe, a second liquid flow meter, and a second injection pump. The second injection pump is connected to the second liquid flow meter. The first end of the first injection pipe is connected to the second injection pump, and the second end of the first injection pipe is connected to the high-precision inlet.

[0005] As a preferred embodiment, the injection cup, the first injection tube, and the second injection tube are provided in multiple and equal quantities. The multiple first injection tubes are respectively connected to the first injection pump, and the multiple second injection tubes are respectively connected to the second injection pump. The number of first injection tubes in a first injection group is greater than the number of second injection tubes in a second injection group.

[0006] As a preferred embodiment, the first injection assembly further includes a first connecting pipe, and a plurality of first injection pipes are respectively connected to the first connecting pipe. The first connecting pipe is connected to the first injection pump to form a first injection group, and the first injection pipe is provided with a first valve body.

[0007] As a preferred embodiment, the second injection assembly further includes a second connecting pipe, and a plurality of second injection pipes are respectively connected to the second connecting pipe. The second connecting pipe is connected to the second injection pump and the second injection assembly. The second injection pipe is provided with a second valve body.

[0008] As a preferred embodiment, the air passage is provided with a first air control valve, a second air control valve and a third air control valve respectively connected to the air passage, the air passage is connected to the air passage interface, the first air control valve is used to connect to a vacuum source, and the second air control valve is used to connect to compressed air.

[0009] As a preferred embodiment, the injection cup is equipped with a laser volume analyzer for obtaining the volume of electrolyte in the cavity, the injection cup is provided with a measuring port, and the laser volume analyzer is connected to the measuring port and inserted into the cavity.

[0010] As a preferred embodiment, the first injection assembly further includes a first temperature sensor, which is connected to the first injection pump; And / or the second injection assembly further includes a second temperature sensor, which is connected to the second injection pump.

[0011] As a preferred embodiment, the injection cup is equipped with an injection valve, which is connected to the injection port.

[0012] As a preferred embodiment, the injection port is located at the end of the injection cup away from the gas passage pipe, and the gas passage interface, the high-speed liquid inlet, and the high-precision liquid inlet are located at the end of the injection cup opposite to the injection port.

[0013] As a preferred embodiment, the first injection pump is a DC pump and / or the second injection pump is a constant flow pump.

[0014] Compared with the prior art, the beneficial effects of this embodiment of the battery cell liquid injection device are as follows: The battery cell liquid injection device includes a liquid injection cup, a gas passage pipe, a first liquid injection component, and a second liquid injection component. The gas passage pipe is used to evacuate, inflate, and restore normal pressure to the liquid injection cup during the liquid injection process. The first and second liquid injection components respectively inject liquid into the liquid injection cup. The first liquid injection pipe is connected to a first liquid injection pump, which pumps electrolyte into the first liquid injection pipe. The first liquid injection pipe is connected to a high-speed liquid inlet to inject electrolyte into the cavity of the liquid injection cup. The second liquid injection pump pumps electrolyte into a second liquid injection pipe, which is connected to a high-precision liquid inlet to inject electrolyte into the cavity of the liquid injection cup. When the liquid injection cup is empty, most of the electrolyte in the liquid injection cup is injected through the first liquid injection component, increasing the injection speed of electrolyte in the liquid injection cup and achieving high-speed liquid injection into the liquid injection cup. The remaining small portion of electrolyte in the injection cup is injected through the second injection assembly, and the flow rate is monitored by the first and second liquid flow meters respectively, improving the accuracy of electrolyte injection and reducing defective products. The first and second injection assemblies perform stepwise injection into the injection cup, achieving a reduction in the defect rate while ensuring high-speed injection. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0016] Figure 2 This is a schematic diagram of the assembly structure of the injection cup, the first injection component, and the second injection component according to an embodiment of the present invention.

[0017] Figure 3 This is a schematic diagram of the liquid injection cup according to an embodiment of the present invention.

[0018] In the picture: 1. Filling cup; 11. Gas line interface; 12. High-speed liquid inlet; 13. High-precision liquid inlet; 14. Filling port; 15. Cavity; 16. Measuring port; 17. Filling valve; 2. Air line; 21. First air control valve; 22. Second air control valve; 23. Third air control valve 3. First injection assembly; 31. First injection pipe; 311. First valve body; 32. First liquid flow meter; 33. First injection pump; 34. First connecting pipe; 35. First temperature sensor; 4. Second injection assembly; 41. Second injection pipe; 411. Second valve body; 42. Second liquid flow meter; 43. Second injection pump; 44. Second connecting pipe; 45. Second temperature sensor 5. Laser volume analyzer; 6. Battery cells. Detailed Implementation

[0019] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0020] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] In the embodiments of the application, "parallel" refers to a state in which the angle formed by two lines, a line and a surface, or a surface is -1° to 1°. "Perpendicular" refers to a state in which the angle formed by two lines, a line and a surface, or a surface is 89° to 91°. Equal distances, equal angles, or equal areas refer to a state in which the tolerance range is -1% to 1%.

[0024] like Figures 1 to 3 As shown, a preferred embodiment of the present invention provides a battery cell 6 liquid injection device, a liquid injection cup 1, which is provided with an air passage interface 11, a high-speed liquid inlet 12, a high-precision liquid inlet 13, a liquid injection port 14, and a cavity 15. The high-speed liquid inlet 12, the high-precision liquid inlet 13, the liquid injection port 14, and the air passage interface 11 are respectively connected to the cavity 15. Gas pipe 2 is connected to gas interface 11; The first liquid injection assembly 3 includes a first liquid injection pipe 31, a first liquid flow meter 32 and a first liquid injection pump 33. The first liquid injection pump 33 is connected to the first liquid flow meter 32. The first end of the first liquid injection pipe 31 is connected to the first liquid injection pump 33 and the second end of the first liquid injection pipe 31 is connected to the high-speed liquid inlet 12. The second injection assembly 4 includes a second injection pipe 41, a second liquid flow meter 42, and a second injection pump 43. The second injection pump 43 is connected to the second liquid flow meter 42. The first end of the first injection pipe 31 is connected to the second injection pump 43, and the second end of the first injection pipe 31 is connected to the high-precision inlet 13.

[0025] This utility model discloses a battery cell electrolyte injection device, comprising an injection cup 1, a gas passage pipe 2, a first injection assembly 3, and a second injection assembly 4. The gas passage pipe 2 is used to evacuate, inflate, and restore normal pressure to the injection cup 1 during the injection process. The first injection assembly 3 and the second injection assembly 4 respectively inject electrolyte into the injection cup 1. The first injection pipe 31 is connected to a first injection pump 33, which pumps electrolyte into the first injection pipe 31. The first injection pipe 31 is connected to a high-speed inlet 12 to inject electrolyte into the cavity 15 of the injection cup 1. The second injection pump 43 pumps electrolyte into the second injection pipe 41, which is connected to a high-precision inlet 13 to inject electrolyte into the cavity 15 of the injection cup 1. When the injection cup 1 is empty, most of the electrolyte in the injection cup 1 is injected through the first injection assembly 3, increasing the electrolyte injection speed of the injection cup 1 and achieving high-speed electrolyte injection into the injection cup 1. The remaining small portion of electrolyte in the injection cup 1 is injected through the second injection assembly 4, and the flow rate is monitored by the first liquid flow meter 32 and the second liquid flow meter 42 respectively, improving the accuracy of electrolyte injection and reducing defective products. The injection cup 1 is injected in stages through the first injection assembly 3 and the second injection assembly 4, achieving a reduction in the defect rate while ensuring high-speed injection.

[0026] In one embodiment, the injection volume of the first injection component 3 is greater than that of the second injection component 4, and the injection speed of the first injection component 3 is faster than that of the second injection component 4, thereby reducing the injection failure rate while ensuring high-speed injection.

[0027] Furthermore, such as Figures 1 to 3 As shown, multiple injection cups 1, first injection tubes 31, and second injection tubes 41 are provided in equal numbers. Multiple first injection tubes 31 are connected to a first injection pump 33 to form a first injection group, and multiple second injection tubes 41 are connected to a second injection pump 43 to form a second injection group. The number of first injection tubes 31 in a first injection group is greater than the number of second injection tubes 41 in a second injection group. The injection cups 1, first injection tubes 31, and second injection tubes 41 are of equal number and grouped together. Multiple injection cups 1 and corresponding numbers of first injection tubes 31 and second injection tubes 41 form a parallel injection system. Each injection cup 1 is connected to one first injection tube 31 and one second injection tube 41. Each injection cup 1 can be injected synchronously and independently, enabling parallel processing of multiple battery cells 6 and improving the production efficiency of battery cell 6 injection. The first injection group adopts a centralized liquid supply mode with one pump and multiple pipes. A single first injection pump 33 simultaneously supplies liquid to multiple first injection pipes 31. Each injection cup 1 receives electrolyte through its dedicated first injection pipe 31. During the empty cup stage, multiple injection cups 1 are sequentially injected with liquid at high speed to increase the injection speed. After the high-speed injection is completed, the second injection pump 43 sequentially injects liquid with high precision into the injection cups 1 in the same second injection group, shortening the waiting time for high-precision injection after high-speed injection and improving the injection efficiency.

[0028] Furthermore, such as Figure 2 As shown, the first injection assembly 3 also includes a first connecting pipe 34, and multiple first injection pipes 31 are respectively connected to the first connecting pipe 34. The first connecting pipe 34 is connected to the first injection pump 33 to form a first injection group. The first injection pipe 31 is provided with a first valve body 311. Each first injection pipe 31 is equipped with an independent first valve body 311, supporting single-pipe opening and closing control. When the first injection pump 33 is started, the electrolyte is diverted through the first connecting pipe 34. The first valve body 311 corresponding to the target injection cup 1 is opened, and the others are closed, so as to realize individual high-speed injection of injection cup 1 within the same first injection group.

[0029] Furthermore, the second injection assembly 4 also includes a second connecting pipe 44, with multiple second injection pipes 41 connected to the second connecting pipe 44 respectively. The second connecting pipe 44 is connected to the second injection pump 43 to form a second injection group. Each second injection pipe 41 is equipped with a second valve body 411. Each second injection pipe 41 is equipped with an independent second valve body 411, supporting single-pipe opening and closing control. When the second injection pump 43 is started, the electrolyte is diverted through the second connecting pipe 44. The second valve body 411 corresponding to the target injection cup 1 is opened, while the others are closed, so as to achieve individual high-precision injection of the injection cup 1 within the same second injection group.

[0030] Furthermore, such as Figure 1 As shown, the gas pipe 2 is equipped with a first gas control valve 21, a second gas control valve 22, and a third gas control valve 23, which are respectively connected to the gas pipe 2. The gas pipe 2 is connected to the gas interface 11. The first gas control valve 21 is used to connect to a vacuum source, and the second gas control valve 22 is used to connect to compressed air. The third gas valve is used to connect to the atmosphere, so that the gas pressure in the injection cup 1 can be restored to normal pressure. Before injection, the first gas control valve 21 is opened to connect the injection cup 1 to the battery cell 6 that needs to be injected with electrolyte, and the battery cell 6 and the injection cup 1 are evacuated to create a negative pressure state. After evacuation, the injection valve 17 of the injection cup 1 is closed. High-speed and high-precision injection is performed on the injection cup 1. During the injection of the injection cup 1, the third gas control valve 23 is in the open state. After the injection of the injection cup 1 is completed, the third gas control valve 23 is closed. After the electrolyte filling cup 1 is completed, the electrolyte filling valve 17 is opened to connect the electrolyte filling cup 1 to the battery cell 6, and electrolyte is injected into the battery cell 6. The first pneumatic control valve 21 is opened to evacuate the battery cell 6 to remove gas. The second pneumatic control valve 22 is opened to pressurize the battery cell 6 to promote electrolyte penetration and improve wetting efficiency. The third pneumatic control valve 23 is opened to gradually restore the gas pressure inside the battery cell 6 to normal atmospheric pressure.

[0031] As one embodiment, such as Figure 1 As shown, before injecting electrolyte into cell 6, the first pneumatic control valve 21 is opened, creating a vacuum state inside cell 6. Then, the first vent valve is closed, and electrolyte is injected into cell 6. During the electrolyte injection stage, the third pneumatic control valve 23 is opened to briefly restore normal pressure inside cell 6, and then closed. The second pneumatic control valve 22 is opened to apply pressure to cell 6, promoting electrolyte wetting of cell 6. The second pneumatic control valve 22 is closed, and then the third pneumatic control valve 23 is opened again to gradually release pressure to normal pressure, and then closed.

[0032] Furthermore, such as Figure 2As shown, the injection cup 1 is equipped with a laser volume analyzer 5 for acquiring the volume of electrolyte in the cavity 15. The injection cup 1 has a measuring port 16, and the laser volume analyzer 5 is connected to the measuring port 16 and inserted into the cavity 15. The laser volume analyzer 5 directly detects the change in electrolyte volume in the cavity 15 through the measuring port 16. When the laser volume analyzer 5 detects that the electrolyte injected during the high-speed injection stage has reached the set volume, the first injection pump 33 stops injecting electrolyte into the first injection tube 31 corresponding to the injection cup 1, and the first valve body 311 of the first injection tube 31 is closed. When performing high-precision injection through the second injection group, the laser volume analyzer 5 re-detects the volume of electrolyte already injected into the injection cup 1 to ensure that the actual high-precision injection volume is based on the actual high-speed injection volume, thereby improving the injection accuracy.

[0033] Furthermore, such as Figure 1 As shown, the first injection assembly 3 also includes a first temperature sensor 35, which is connected to the first injection pump 33. And / or the second injection assembly 4 also includes a second temperature sensor 45, which is connected to the second injection pump 43. Factors affecting electrolyte density include the formulation and temperature; when the formulation is constant, temperature will affect the electrolyte density. To reduce the influence of this factor, a first temperature sensor 35 is connected inside the first injection pump 33, and a second temperature sensor 45 is connected inside the second injection pump 43. The real-time electrolyte density is calibrated according to different temperatures, and the electrolyte volume is then controlled by volume to improve the accuracy of the electrolyte injection volume.

[0034] Furthermore, such as Figure 3 As shown, the injection cup 1 is equipped with an injection valve 17, which is connected to the injection port 14. The injection valve 17 controls the opening and closing of the injection port 14 to control the connection state between the injection cup 1 and the battery cell 6.

[0035] Furthermore, such as Figure 3 As shown, the liquid injection port 14 is located at the end of the liquid injection cup 1 away from the gas passage pipe 2, and the gas passage interface 11, the high-speed liquid inlet 12, and the high-precision liquid inlet 13 are located at the end of the liquid injection cup 1 opposite to the liquid injection port 14, so that the electrolyte flows unidirectionally and linearly in the liquid injection cup 1, thereby improving the smoothness of the electrolyte flow.

[0036] Furthermore, such as Figure 1 As shown, the first injection pump 33 is a DC pump with pulse-free delivery. This avoids the generation of electrolyte bubbles and ensures the wetting quality of the battery cell 6. Its fast response speed ensures the stability of electrolyte injection. The second injection pump 43 is a constant flow pump, capable of achieving nanometer-level flow accuracy, meeting the injection requirements of the injection cup 1 during the high-precision injection stage and ensuring the injection accuracy of the injection cup 1.

[0037] In summary, this utility model embodiment provides a battery cell 6 liquid injection device, including a liquid injection cup 1, a gas pipe 2, a first liquid injection component 3, and a second liquid injection component 4. The gas pipe 2 is used to evacuate, inflate, and restore normal pressure to the liquid injection cup 1 during the liquid injection process. The first liquid injection component 3 and the second liquid injection component 4 respectively inject liquid into the liquid injection cup 1. The first liquid injection pipe 31 is connected to the first liquid injection pump 33, which pumps the electrolyte into the first liquid injection pipe 31. The first liquid injection pipe 31 is connected to the high-speed liquid inlet 12 to inject the electrolyte into the cavity 15 of the liquid injection cup 1. The second liquid injection pump 43 pumps the electrolyte into the second liquid injection pipe 41, which is connected to the high-precision liquid inlet 13 to inject the electrolyte into the cavity 15 of the liquid injection cup 1. When the injection cup 1 is empty, most of the electrolyte is injected into the injection cup 1 through the first injection assembly 3, increasing the injection speed and achieving high-speed injection. The remaining small portion of electrolyte is injected into the injection cup 1 through the second injection assembly 4, with flow rate monitored by the first liquid flow meter 32 and the second liquid flow meter 42 respectively, improving the accuracy of electrolyte injection and reducing defective products. By using the first injection assembly 3 and the second injection assembly 4 to inject electrolyte into the injection cup 1 in stages, the defect rate is reduced while maintaining high-speed injection.

[0038] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this utility model, and these improvements and substitutions should also be considered within the protection scope of this utility model.

Claims

1. An electrode injection device, characterized by comprising: include: The injection cup (1) is provided with a gas path interface (11), a high-speed liquid inlet (12), a high-precision liquid inlet (13), an injection port (14), and a cavity (15). The high-speed liquid inlet (12), the high-precision liquid inlet (13), the injection port (14), and the gas path interface (11) are respectively connected to the cavity (15). Air passage pipe (2), the air passage pipe (2) is connected to the air passage interface (11), The first liquid injection assembly (3) includes a first liquid injection pipe (31), a first liquid flow meter (32) and a first liquid injection pump (33). The first liquid injection pump (33) is connected to the first liquid flow meter (32). The first end of the first liquid injection pipe (31) is connected to the first liquid injection pump (33), and the second end of the first liquid injection pipe (31) is connected to the high-speed liquid inlet (12). The second injection assembly (4) includes a second injection pipe (41), a second liquid flow meter (42), and a second injection pump (43). The second injection pump (43) is connected to the second liquid flow meter (42). The first end of the first injection pipe (31) is connected to the second injection pump (43), and the second end of the first injection pipe (31) is connected to the high-precision inlet (13).

2. The liquid injection apparatus for the battery cell according to claim 1, characterized by: The injection cup (1), the first injection tube (31) and the second injection tube (41) are provided in multiple and equal quantities. The multiple first injection tubes (31) are respectively connected to the first injection pump (33), and the multiple second injection tubes (41) are respectively connected to the second injection pump (43). The number of first injection tubes (31) in a first injection group is greater than the number of second injection tubes (41) in a second injection group.

3. The liquid injection apparatus for the battery cell according to claim 2, wherein: The first injection assembly (3) further includes a first connecting pipe (34), and a plurality of first injection pipes (31) are respectively connected to the first connecting pipe (34). The first connecting pipe (34) is connected to the first injection pump (33) to form a first injection group. The first injection pipe (31) is provided with a first valve body (311).

4. The liquid injection apparatus for the battery cell according to claim 2, wherein: The second injection assembly (4) further includes a second connecting pipe (44), and a plurality of second injection pipes (41) are respectively connected to the second connecting pipe (44). The second connecting pipe (44) is connected to the second injection pump (43) to form a second injection group. The second injection pipe (41) is provided with a second valve body (411).

5. The liquid injection apparatus of claim 1, wherein: The air passage (2) is provided with a first air control valve (21), a second air control valve (22) and a third air control valve (23) respectively connected to the air passage (2). The air passage (2) is connected to the air passage interface (11). The first air control valve (21) is used to connect to a vacuum source and the second air control valve (22) is used to connect to compressed air.

6. The liquid injection apparatus of claim 1, wherein: The injection cup (1) is equipped with a laser volume analyzer (5) for obtaining the volume of electrolyte in the cavity (15). The injection cup (1) is equipped with a measuring port (16). The laser volume analyzer (5) is connected to the measuring port (16) and inserted into the cavity (15).

7. The liquid injection apparatus of claim 1, wherein: The first injection assembly (3) further includes a first temperature sensor (35), which is connected to the first injection pump (33); And / or the second injection assembly (4) further includes a second temperature sensor (45) connected to the second injection pump (43).

8. The liquid injection apparatus of claim 1, wherein: The injection cup is equipped with an injection valve (17), which is connected to the injection port (14).

9. The liquid injection apparatus of claim 1, wherein: The injection port (14) is located at the end of the injection cup (1) away from the gas pipe (2), and the gas interface (11), the high-speed liquid inlet (12), and the high-precision liquid inlet (13) are located at the end of the injection cup (1) opposite to the injection port (14).

10. The liquid injection apparatus of claim 1, wherein: The first injection pump (33) is a DC pump and / or the second injection pump (43) is a constant flow pump.

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