Pump-free liquid injection unit and pump-free liquid injection assembly

Abstract

In order to solve the problems in the prior art, the pump-free liquid injection unit and the pump-free liquid injection assembly are provided, and the pump-free liquid injection unit comprises a cup body, a liquid level determining piece, an air source connector, an input valve and a liquid level detecting mechanism; wherein the liquid level determining piece is arranged in the cup body; the gas source interface is arranged on the cup body and is used for applying positive pressure to the liquid in the cup body so as to accelerate the outflow of the electrolyte; a through hole is formed in the liquid level determining piece, and an open groove is formed in the side wall of the liquid level determining piece; the open groove is communicated with the through hole and used for determining the height of the liquid level in the cup body according to the position of the open groove. According to the pump-free liquid injection assembly, the liquid level height in the cup body is determined through the liquid level determining piece, an external air source serves as flowing power of electrolyte, a variable pump is replaced, and the cost of the liquid injection assembly is greatly reduced; and the structure is simple, and later maintenance is convenient.

Description

Technical Field

[0001] The present application relates to the technical field of battery preparation, and in particular to an injection unit that does not require an injection pump and an injection assembly including the injection unit. Background Art

[0002] As a key step in the lithium battery production process, electrolyte injection volume has a significant impact on the electrochemical performance and safety performance of lithium batteries. Therefore, the injection pump, as a core component of the lithium battery injection process, plays a vital role in controlling the accuracy of the electrolyte.

[0003] In order to solve the problem of electrolyte waste caused by repeated calibration due to manual adjustment of the deflection angle when adjusting the injection volume of traditional ceramic electric pumps, a fully CNC intelligent variable pump is currently used for injection, which can accurately adjust the injection volume, reduce labor and raw material waste, and improve the consistency of lithium battery injection.

[0004] However, the cost of the fully CNC intelligent variable pump is high, and the structure is complex, and the subsequent maintenance cost is high, which increases the production burden of the enterprise.

[0005] In view of this, a pumpless injection unit with simple structure and low cost is in urgent need of research and development. Summary of the Invention

[0006] The present application provides a pumpless liquid injection unit and a pumpless liquid injection component, which are used to solve at least one technical problem in the prior art.

[0007] The specific technical solutions are as follows:

[0008] A pumpless liquid injection unit, comprising:

[0009] The cup body has an input end connected to a container for holding battery electrolyte and an output end connected to the battery to be filled;

[0010] A liquid level determining member, disposed in the cup body;

[0011] An air source interface is provided on the cup body and is used to apply positive pressure to the liquid in the cup body to accelerate the outflow of the electrolyte;

[0012] The liquid level determining member is provided with a through hole, and a groove is provided on a side wall of the liquid level determining member;

[0013] The slot is connected to the through hole and is used to determine the height of the liquid level in the cup body according to the position of the slot.

[0014] The pumpless liquid injection unit further comprises:

[0015] An input valve is provided at the input end of the cup body;

[0016] The liquid level detection mechanism is arranged on the cup body and is used to control the on-off of the input valve according to the liquid level height in the cup body.

[0017] The liquid level detection mechanism comprises:

[0018] control unit;

[0019] a liquid level detection unit, disposed on the outside of the cup body and aligned with the through hole;

[0020] An observation window is provided at the position where the liquid level detection unit is provided on the cup body, so as to facilitate detection of the liquid level height in the cup body;

[0021] The adjustment structure is connected to the liquid level detection unit and is used to adjust the position of the liquid level detection unit to determine the target liquid level height in the cup body.

[0022] A pumpless liquid injection assembly, comprising:

[0023] At least one pumpless priming unit as described above;

[0024] a substrate, on which the cup body of the pumpless liquid injection unit is arranged;

[0025] The bracket mechanism is arranged on the base plate and connected to the liquid level determining member in the pumpless liquid injection unit, and is used to adjust the relative position of the through hole of the liquid level determining member in the cup body, thereby adjusting the amount of liquid in the cup body.

[0026] The support mechanism comprises:

[0027] Two guide rails are arranged in parallel, and ends of the guide rails are arranged on the base plate;

[0028] A connecting member, arranged between the two guide rails;

[0029] A movable part, matched with the two guide rails;

[0030] a driving unit, disposed on the connecting member, wherein an output end of the driving unit is matched and connected with the movable member, and is used to drive the movable member to move along the guide rail;

[0031] a fixing unit, arranged on the movable part;

[0032] The fixing unit is connected to an end portion of the liquid level determining member.

[0033] The pumpless liquid injection assembly further comprises:

[0034] The telescopic mechanism is provided on the substrate and is used to adjust the distance between the pumpless liquid injection unit and the battery to be injected, so as to hermetically connect the pumpless liquid injection unit and the battery to be injected.

[0035] The telescopic mechanism comprises:

[0036] a telescopic driving unit, arranged on the substrate;

[0037] A support body, arranged at the output end of the telescopic drive unit;

[0038] a guide group, arranged between the support body and the substrate;

[0039] The connecting nozzle is arranged on the supporting body and is arranged toward the battery to be filled with liquid, and is used for sealing connection with the battery to be filled with liquid through the telescopic driving unit.

[0040] The pumpless liquid injection assembly further comprises: at least one fixing mechanism for fixing the battery to be injected during injection;

[0041] The fixing mechanism comprises:

[0042] A fixed connecting body, arranged on the supporting body;

[0043] A fixed driving unit, arranged on the fixed connecting body;

[0044] a transition body, one end of which is rotatably connected to the output end of the fixed drive unit, and the other end of which is rotatably connected to the fixed connection body;

[0045] The fixed body is arranged on a side of the transition body away from the output end of the fixed drive unit and is used for connecting with the battery to be filled with liquid.

[0046] The pumpless liquid injection assembly further comprises:

[0047] A support frame is provided on the substrate;

[0048] At least one container is arranged on the support frame;

[0049] The output end of the container is connected to the input end of the pumpless liquid injection unit.

[0050] The pumpless liquid injection assembly further includes: at least one overflow collection unit;

[0051] The input end of the overflow collection unit is connected to the output end of the liquid level determining component in the pumpless liquid injection unit, and is used to collect the electrolyte overflowing from the through hole.

[0052] The beneficial effects brought about by this application are:

[0053] The present application sets a hollow liquid level determining part in the cup body, and then sets a through hole on the liquid level determining part, and sets a slot on the side wall of the liquid level determining part, which is used to determine the height of the liquid level in the cup body by the position of the slot, thereby completing the quantitative control of the liquid level; then, the external air source is connected through the air source interface to apply positive pressure to the liquid in the cup body to accelerate the outflow of the electrolyte; the pumpless liquid filling component described in the present application uses the liquid level determining part to confirm the height of the liquid level in the cup body, and uses the external air source as the flow power of the electrolyte, replacing the variable pump, thereby greatly reducing the cost of the liquid filling component; moreover, the structure is simple and the subsequent maintenance is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0055] Figure 1 It is a structural schematic diagram of the pumpless liquid injection unit described in this application.

[0056] Figure 2 yes Figure 1 main view.

[0057] Figure 3 yes Figure 1 Schematic diagram of the structure of the liquid level determination component.

[0058] Figure 4 yes Figure 1 Enlarged view of point D in the middle.

[0059] Figure 5 It is a structural schematic diagram of the pumpless liquid injection component described in this application.

[0060] Figure 6 yes Figure 5 rear view.

[0061] Figure 7 yes Figure 5 Enlarged view of point E.

[0062] Figure 8 yes Figure 5 Schematic diagram of the structure of the telescopic mechanism.

[0063] Figure 9 yes Figure 8 Schematic diagram of the structure of the fixed components.

[0064] Figure 10 It is a schematic diagram of the structure of a pumpless liquid injection component including a support frame and a container.

[0065] exist Figure 1-10 middle:

[0066] 1. Cup body; 2. Liquid level determining member; 3. Air source interface; 4. Input valve; 5. Liquid level detection mechanism; 6. Base plate; 7. Bracket mechanism; 8. Telescopic mechanism; 9. Support frame; 10. Container; 501. Control unit; 502. Liquid level detection unit; 503. Adjustment structure; 701. Guide rail; 702. Connecting member; 703. Movable member; 704. Drive unit; 705. Fixed unit; 801. Telescopic drive unit; 802. Support body; 803. Guide group; 804. Connecting nozzle; 805. Fixing mechanism; 5031. Guide column; 5032. Guide block; 8051. Fixed connecting body; 8052. Fixed drive unit; 8053. Transition body; 8054. Fixed body; 2A. Through hole; 2B. Slot. DETAILED DESCRIPTION

[0067] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application. Specific embodiment 1:

[0069] This application provides an embodiment:

[0070] like Figure 1-2 A pumpless liquid filling unit comprises: a cup body 1, a liquid level determining member 2, an air source interface 3, an input valve 4, and a liquid level detection mechanism 5; wherein the input end of the cup body 1 is connected to a container for holding battery electrolyte, and its output end is connected to the battery to be filled; the liquid level determining member 2 is arranged in the cup body 1; the air source interface 3 is arranged on the cup body 1, and is used to apply positive pressure to the liquid in the cup body 1 to accelerate the outflow of the electrolyte; Figure 3 In order to quantify the liquid capacity of the cup body 1, a through hole 2A is provided in the liquid level determining member 2, and a groove 2B is provided on the side wall of the liquid level determining member 2; the groove 2B is connected to the through hole 2A and is used to determine the height of the liquid level in the cup body 1 according to the position of the groove 2B.

[0071] During use, the height of the slot 2B can be set according to the need for liquid injection, thereby determining the volume of the liquid in the cup body 1; excess liquid in the cup body 1 will overflow from the slot 2B, ensuring that the liquid in the cup body 1 is constant.

[0072] In order to ensure the liquid supply of the container, an input valve 4, such as a solenoid valve, is provided at the input end of the cup body 1; a liquid level detection mechanism 5 is provided on the cup body 1, for controlling the on and off of the input valve 4 according to the liquid level height in the cup body 1.

[0073] Preferably, Figure 4 The liquid level detection mechanism 5 includes: a control unit 501, a liquid level detection unit 502, and an adjustment structure 503. The liquid level detection unit 502 is arranged on the outside of the cup body 1 and aligned with the through hole 2A. The cup body 1 is provided with an observation window at the position where the liquid level detection unit 502 is provided, which is used to facilitate the detection of the liquid level height in the cup body 1. In order to expand the scope of use, an adjustment structure 503 is also provided. The adjustment structure 503 is connected to the liquid level detection unit 502 and is used to adjust the position of the liquid level detection unit 502 to determine the target liquid level height in the cup body. At the same time, a solenoid valve can also be provided between the output end of the cup body 1 and the battery to be filled with liquid. The solenoid valve can also be electrically connected to the control unit 501 and controlled by the control unit 501 to be turned on and off.

[0074] When in use, the outer wall of the cup body 1 is set to be transparent, and the relative position of the liquid level detection unit 502 on the cup body 1 is adjusted by adjusting the structure 503 to determine the final target liquid level height; the liquid level height corresponds to the target volume of this injection; the liquid level detection unit 502, such as a photoelectric sensor, is set on the outside of the cup body 1 and aligned with the position of the slot 2B, so that when the liquid level in the cup body 1 reaches the position of the slot 2B, on the one hand, excess liquid overflows from the slot 2B, and on the other hand, the control unit 501, such as the single-chip microcomputer 89S51, controls the input valve 4 to close to prevent excessive liquid from being injected into the cup body 1; and, in the process of injection, the external gas source is connected through the gas source interface 3 to apply positive pressure to the cup body 1, such as connecting the process gas in the factory, thereby accelerating the liquid to flow out from the output end of the cup body 1; in this way, injection can be achieved without a pump body, reducing production investment; and, maintenance is very simple.

[0075] Preferably, the adjustment structure 503 can manually adjust the position of the liquid level detection unit 502, including: setting a guide post 5031 on the outside of the cup body 1 as a guide rail; a guide block 5032 is placed on the guide post 5031, as a slider, and connected to the liquid level detection unit 502; when setting the target liquid level, the liquid level detection unit 502 is manually pushed to the target position. It should be noted that the control unit 501 in this embodiment does not involve structural Specific embodiment 2:

[0077] This application also provides an embodiment:

[0078] In the specific embodiment 1, since the relative position of the slot 2B in the cup body 1 is fixed, the liquid level corresponding to each cup body 1 is consistent, which makes the practicality of the cup body 1 low. In order to solve this problem, the present application provides the following technical solutions:

[0079] like Figure 5 A pumpless liquid injection component comprises: three parallel arranged pumpless liquid injection units as described in specific embodiment 1, a substrate 6 and a bracket mechanism 7; wherein the substrate 6 is used to set the cup body 1 in the pumpless liquid injection unit; the bracket mechanism 7 is arranged on the substrate 6 and is connected to one end of the liquid level determining member 2 in the pumpless liquid injection unit, and is used to adjust the relative position of the through hole 2A of the liquid level determining member 2 in the cup body 1, thereby adjusting the amount of liquid in the cup body 1.

[0080] Specifically, such as Figure 6 The bracket mechanism 7 includes: two guide rails 701, a connecting member 702, a movable member 703, a driving unit 704 and a fixing unit 705; wherein, the two guide rails 701 are arranged in parallel, and the ends are arranged on the substrate 6; the connecting member 702 is fixed between the two guide rails 701; the movable member 703 is arranged on the two guide rails 701 and can move on the guide rails 701; the driving unit 704, such as a stepping motor, is fixed on the connecting member 702, and the output end of the driving unit 704 is matched and connected with the movable member 703, for driving the movable member 703 to move along the guide rails 701; the fixing unit 705 is arranged on the movable member 703; the fixing unit 705 is connected to the end of the liquid level determining member 2.

[0081] Preferably, a slider is provided between the movable member 703 and the guide rail 701; a screw is provided at the output end of the driving unit; a thread is provided on the movable member 703 to match the screw; Figure 7 The fixing unit 705 can be a clamping structure for fixing the end of the liquid level determining member 2.

[0082] During use, the end of the liquid level determining member 2 exposed outside the cup body 1 is clamped by the fixing unit 705; then, the liquid level determining member 2 is driven up and down by the driving unit 704, thereby changing the relative position of the through hole 2A in the cup body 1, thereby changing the liquid level quantity in the cup body 1.

[0083] In this embodiment, in order to facilitate the use of the pumpless liquid injection assembly, the pumpless liquid injection assembly needs to be connected to the battery to be injected. The specific technical solution is as follows:

[0084] The above-mentioned pumpless liquid injection component further includes: a telescopic mechanism 8; Figure 8The telescopic mechanism 8 is provided on the substrate 6 and is used to adjust the distance between the pumpless liquid injection unit and the battery to be injected, so as to tightly connect the pumpless liquid injection unit and the battery to be injected.

[0085] Specifically, the telescopic mechanism 8 includes: a telescopic drive unit 801, a support body 802, a guide group 803, and a connecting nozzle 804; wherein, the telescopic drive unit 801 is fixed on the substrate 6; the support body 802 is arranged at the output end of the telescopic drive unit 801; the guide group 803 is arranged between the support body 802 and the substrate 6; the connecting nozzle 804 is arranged on the support body 802 and is arranged toward the battery to be filled with liquid, and is used to be sealed and connected with the battery to be filled with liquid through the telescopic drive unit 801.

[0086] In this embodiment, a telescopic drive unit 801, such as a stepper motor, is used. By connecting a lead screw to the output end of the telescopic drive unit 801 and providing a thread corresponding to the lead screw on the support body 802, the telescopic drive unit 801 can drive the support body 802 to move up and down. At the same time, a guide group 803 is provided between the support body 802 and the base plate 6 to ensure the telescopic movement of the support body 802. Moreover, the connecting nozzle 804 is matched with the liquid injection port of the battery to be injected, facilitating a sealed connection between the two. Preferably, a limit structure can be provided at the end of the guide group 803 to prevent excessive displacement of the support body 802.

[0087] During use, in order to prevent relative movement between the battery to be filled and the telescopic mechanism 8, which would cause a change in the sealing between the connecting nozzle 804 and the battery to be filled, the pumpless filling assembly in this embodiment further includes: two symmetrically arranged fixing mechanisms 805 for fixing the battery to be filled during filling;

[0088] like Figure 9 The fixing mechanism 805 includes: a fixed connecting body 8051, a fixed driving unit 8052, a transition body 8053 and a fixed body 8054; wherein the fixed connecting body 8051 is fixed to the support body 802 by a bolt structure; the fixed driving unit 8052, such as a cylinder, is arranged on the fixed connecting body 8051; one end of the transition body 8053 is rotatably connected to the output end of the fixed driving unit 8052, and the other end is rotatably connected to the fixed connecting body 8051; the fixed body 8054 is arranged on a side of the transition body 8053 away from the output end of the fixed driving unit 8052, and is used to cooperate with the battery to be filled with liquid.

[0089] like Figure 10In order to improve the integrity, the pumpless liquid injection component described in this embodiment further includes: a support frame 9, at least one container 10 and an overflow collection unit; wherein, the support frame 9 is arranged on the substrate 6; the container 10 is arranged on the support frame 9; the output end of the container 10 is connected to the input end of the pumpless liquid injection unit; the overflow collection unit is arranged on the substrate 6; the input end of the overflow collection unit is connected to the output end of the liquid level determining component 2 in the pumpless liquid injection unit, for collecting the electrolyte overflowing from the through hole 2A; the overflow collection unit is not limited and is not marked in the drawings.

[0090] It should be made clear that other technologies not detailed in this article are all existing technologies.

[0091] The above description is only a preferred embodiment of the application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A pumpless injection unit, characterized in that: include: The cup body has an input end connected to a container for holding battery electrolyte and an output end connected to the battery to be filled; A liquid level determining member, disposed in the cup body; An air source interface is provided on the cup body and is connected to an external air source, and is used to apply positive pressure to the liquid in the cup body to accelerate the outflow of the electrolyte; The liquid level determining member is provided with a through hole, and a groove is provided on a side wall of the liquid level determining member; The slot is connected to the through hole and is used to determine the height of the liquid level in the cup body according to the position of the slot.

2. The pumpless liquid injection unit according to claim 1, characterized in that: Also includes: An input valve is provided at the input end of the cup body; The liquid level detection mechanism is arranged on the cup body and is used to control the on-off of the input valve according to the liquid level height in the cup body.

3. The pumpless liquid injection unit according to claim 2, characterized in that: The liquid level detection mechanism comprises: control unit; a liquid level detection unit, disposed on the outside of the cup body and aligned with the through hole; An observation window is provided at the position where the liquid level detection unit is provided on the cup body, so as to facilitate detection of the liquid level height in the cup body; The adjustment structure is connected to the liquid level detection unit and is used to adjust the position of the liquid level detection unit to determine the target liquid level height in the cup body.

4. A pumpless liquid injection component, characterized in that: include: At least one pumpless infusion unit according to claim 1, 2 or 3; a substrate, on which the cup body of the pumpless liquid injection unit is arranged; The bracket mechanism is arranged on the base plate and connected to the liquid level determining member in the pumpless liquid injection unit, and is used to adjust the relative position of the through hole of the liquid level determining member in the cup body, thereby adjusting the amount of liquid in the cup body.

5. The pumpless liquid injection assembly according to claim 4, characterized in that: The support mechanism comprises: Two guide rails are arranged in parallel, and ends of the guide rails are arranged on the base plate; A connecting member, arranged between the two guide rails; A movable part, matched with the two guide rails; a driving unit, disposed on the connecting member, wherein an output end of the driving unit is matched and connected with the movable member, and is used to drive the movable member to move along the guide rail; a fixing unit, arranged on the movable part; The fixing unit is connected to an end portion of the liquid level determining member.

6. The pumpless liquid injection assembly according to claim 4, characterized in that: Also includes: The telescopic mechanism is provided on the substrate and is used to adjust the distance between the pumpless liquid injection unit and the battery to be injected, so as to hermetically connect the pumpless liquid injection unit and the battery to be injected.

7. The pumpless liquid injection assembly according to claim 6, characterized in that: The telescopic mechanism comprises: a telescopic driving unit, arranged on the substrate; A support body, arranged at the output end of the telescopic drive unit; a guide group, arranged between the support body and the substrate; The connecting nozzle is arranged on the supporting body and is arranged toward the battery to be filled with liquid, and is used for sealing connection with the battery to be filled with liquid through the telescopic driving unit.

8. The pumpless liquid injection assembly according to claim 7, characterized in that: Also includes: At least one fixing mechanism for fixing the battery to be filled during filling; The fixing mechanism comprises: A fixed connector, disposed on the support body; A fixed driving unit, arranged on the fixed connecting body; a transition body, one end of which is rotatably connected to the output end of the fixed drive unit, and the other end of which is rotatably connected to the fixed connection body; The fixed body is arranged on a side of the transition body away from the output end of the fixed drive unit and is used for connecting with the battery to be filled with liquid.

9. The pumpless liquid injection assembly according to claim 4, characterized in that: Also includes: A support frame is provided on the substrate; At least one container is arranged on the support frame; The output end of the container is connected to the input end of the pumpless liquid injection unit.

10. The pumpless liquid injection assembly according to claim 4, characterized in that: Also includes: At least one overflow collection unit; The input end of the overflow collection unit is connected to the output end of the liquid level determining component in the pumpless liquid injection unit, and is used to collect the electrolyte overflowing from the through hole.

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