Temporary storage cup for negative pressure formation of lithium battery

Abstract

The utility model discloses a temporary storage cup for lithium battery negative pressure formation, which is characterized by comprising a sealed cup body, the bottom of the cup body is vertically provided with a liquid inlet pipe used for being connected with a battery liquid injection hole, the top of the cup body is provided with a guide hole which is coaxially and right opposite to the liquid inlet pipe, and the guide hole is communicated with the liquid inlet pipe. A liquid injection pipe is arranged in the guide hole in a sliding and sealing fit mode, the lower end of the liquid injection pipe extends into the liquid inlet pipe, a vent hole penetrating in the radial direction is formed in the lower end of the liquid injection pipe, and a sealing sleeve matched with the liquid injection pipe in a sliding and sealing mode is arranged in the liquid inlet pipe. The vent hole can move to the position above or below the sealing sleeve along with the up-down movement of the liquid injection pipe; the top of the cup body is further provided with a through air inlet pipe. The secondary liquid injection device has the advantages that the structural design is ingenious, secondary liquid injection can be completed on a negative pressure formation station, and the utilization rate of equipment is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery production, in particular to a temporary storage cup for negative pressure formation of lithium batteries. Background Art

[0002] Negative pressure formation is to evacuate the battery cell to -80KPa from the injection port during the charge and discharge process. Negative pressure formation can remove the generated gas in time, ensuring the stability and consistency of the SEI film. However, the formation equipment is complex and has high requirements for air tightness. In addition, electrolyte loss will occur during the vacuuming process, and secondary refilling is required under negative pressure to ensure that the electrolyte in each battery meets the designed content. The existing negative pressure formation and secondary refilling are operated by two independent sets of equipment, which need to be maintained separately, which not only increases maintenance costs, but also reduces the utilization rate of equipment resources. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the utility model is: how to provide a temporary storage cup with an ingenious structural design, which can complete secondary liquid injection at a negative pressure forming station and improve the utilization rate of the equipment.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A temporary storage cup for negative pressure formation of lithium batteries, characterized in that it includes a sealed cup body, a liquid inlet pipe for connecting to a battery injection hole is vertically arranged at the bottom of the cup body, a guide hole is provided on the top of the cup body coaxially opposite to the liquid inlet pipe, a liquid injection pipe is slidably and sealedly fitted in the guide hole, the lower end of the liquid injection pipe extends into the liquid inlet pipe, the lower end of the liquid injection pipe has an air vent extending radially therethrough, a sealing sleeve is provided in the liquid inlet pipe that is slidably and sealably fitted with the liquid injection pipe, so that the air vent can move up and down with the liquid injection pipe to the top or bottom of the sealing sleeve; the top of the cup body also has an air inlet pipe that is arranged through it.

[0006] When in use, connect the air inlet pipe to the vacuum system, connect the injection pipe to the injection equipment, and connect the inlet pipe to the injection hole of the battery through the nozzle; when negative pressure is formed, move the injection pipe upwards and move the vent to the top of the sealing sleeve, that is, the vent is located inside the cup body, and the vacuum system is used to draw negative pressure, and the gas in the battery enters the cup body through the inlet pipe and the vent. After the negative pressure formation is completed, weigh the battery to determine the amount of fluid replenishment required for each battery. When replenishing fluid, first draw negative pressure on the cup body, then move the injection pipe downward so that the vent is located below the sealing sleeve. The sealing sleeve separates the vent from the cup body, and the replenishment enters the battery's injection hole directly from the injection pipe. Since the injection pipe is inserted under negative pressure, the inside of the battery is still in a negative pressure environment, making secondary injection easier.

[0007] Furthermore, the bottom of the cup body is funnel-shaped, and the liquid inlet pipe is connected and arranged at the lowest point of the cup body.

[0008] Furthermore, the bottom of the cup body has a through-going lower threaded hole, the upper end of the liquid inlet pipe has an external threaded pipe section matching the lower threaded hole, and the liquid inlet pipe is detachably connected to the lower threaded hole through the external threaded pipe section.

[0009] In this way, once the sealing sleeve is worn or aged, it can be replaced as a whole or partially by disassembling the liquid inlet pipe, which is convenient for maintenance.

[0010] Furthermore, the lower end of the externally threaded pipe section has a flange protruding radially, the outer end of the lower threaded hole is provided with a sealing surface facing the flange, and the flange is equipped with an annular sealing gasket; the length of the externally threaded pipe section is smaller than the length of the lower threaded hole, and is sealingly screwed on the lower threaded hole.

[0011] Furthermore, the top of the cup body has an upper threaded hole coaxially arranged with the lower threaded hole, and is detachably connected to a liquid filling seat, the guide hole is penetrated on the liquid filling seat, and the liquid filling seat has a liquid inlet hole radially penetrating the guide hole; the upper end of the liquid filling tube has a liquid inlet radially penetrating, and the top is closed; the lower end of the guide hole has a sealing ring cooperating with the liquid filling tube, and the upper end of the guide hole has a sealing section cooperating with the liquid filling tube for sliding sealing, and the length of the sealing section is greater than the diameter of the liquid inlet; the distance between the liquid inlet and the air hole is smaller than the distance between the liquid inlet and the sealing sleeve, so that when the air hole is located in the cup body, the liquid inlet is sealed in the sealing section, and when the liquid inlet is located at the liquid inlet, the air hole is located below the sealing sleeve.

[0012] Furthermore, a group of sealing rings are respectively arranged at both ends of the sealing section.

[0013] Furthermore, the guide hole has an annular groove formed by radial depression, and the liquid inlet hole is arranged on the groove wall of the annular groove.

[0014] Furthermore, the cup body is integrally injection molded.

[0015] In summary, the utility model has the advantages of clever structural design, being able to complete secondary liquid injection at a negative pressure forming station, and improving equipment utilization, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic cross-sectional view of an embodiment of the utility model.

[0017] Figure 2 for Figure 1 Schematic diagram of the enlarged structure of part A.

[0018] Figure 3 for Figure 1 Schematic diagram of the enlarged structure of part B. DETAILED DESCRIPTION

[0019] The utility model is further described in detail below in conjunction with the embodiments.

[0020] When implementing: Figure 1 to Figure 3 As shown, a temporary storage cup for negative pressure formation of lithium batteries comprises an integrally injection-molded cup body 1, the bottom of the cup body 1 is vertically provided with a liquid inlet pipe 2 for connecting to the battery liquid injection hole, the top of the cup body 1 has a guide hole coaxially arranged opposite to the liquid inlet pipe 2, a liquid injection pipe 3 is slidably and sealedly fitted in the guide hole, the lower end of the liquid injection pipe 3 extends into the liquid inlet pipe 2, the lower end of the liquid injection pipe 3 has a vent hole penetrating radially, the liquid inlet pipe 2 is provided with a sealing sleeve 4 slidably and sealingly fitted with the liquid injection pipe 3, so that the vent hole can move up and down with the liquid injection pipe 3 to the top or bottom of the sealing sleeve 4; the top of the cup body 1 also has an air inlet pipe arranged through it. As shown Figure 1 As shown, the bottom of the cup body 1 is funnel-shaped, and the liquid inlet pipe 2 is connected and arranged at the lowest point of the cup body 1. The bottom of the cup body 1 has a through-going lower threaded hole, and the upper end of the liquid inlet pipe 2 has an external threaded pipe section that matches the lower threaded hole, and the liquid inlet pipe 2 is detachably connected to the lower threaded hole through the external threaded pipe section. The lower end of the external threaded pipe section has a flange protruding in the radial direction, and the outer end of the lower threaded hole is provided with a sealing surface facing the flange, and the flange is matched with an annular sealing gasket; the length of the external threaded pipe section is less than the length of the lower threaded hole, and is sealed and screwed on the lower threaded hole.

[0021] like Figure 2As shown, the top of the cup body 1 has an upper threaded hole coaxially arranged with the lower threaded hole, and is detachably connected to a liquid injection seat 5, the guide hole is penetrated on the liquid injection seat 5, and the liquid injection seat 5 has a liquid inlet hole arranged along the radial direction of the guide hole; the upper end of the liquid injection tube 3 has a liquid inlet passing through in the radial direction, and the top is closed; the lower end of the guide hole has a sealing ring cooperating with the liquid injection tube 3, and the upper end of the guide hole has a sealing section slidably and sealably cooperating with the liquid injection tube 3, and the length of the sealing section is greater than the diameter of the liquid inlet; the distance between the liquid inlet and the air hole is smaller than the distance between the liquid inlet and the sealing sleeve 4, so that when the air hole is located in the cup body 1, the liquid inlet is sealed in the sealing section, and when the liquid inlet is located at the liquid inlet, the air hole is located below the sealing sleeve 4. A group of sealing rings are respectively arranged at the two ends of the sealing section; an annular groove formed by radial depression is arranged in the guide hole, and the liquid inlet hole is arranged on the groove wall of the annular groove.

[0022] When in use, connect the air inlet pipe to the vacuum system, connect the injection pipe to the injection equipment, and connect the inlet pipe to the injection hole of the battery through the nozzle; when negative pressure is formed, move the injection pipe upwards and move the vent to the top of the sealing sleeve, that is, the vent is located inside the cup body, and the vacuum system is used to draw negative pressure, and the gas in the battery enters the cup body through the inlet pipe and the vent. After the negative pressure formation is completed, weigh the battery to determine the amount of fluid replenishment required for each battery. When replenishing fluid, first draw negative pressure on the cup body, then move the injection pipe downward so that the vent is located below the sealing sleeve. The sealing sleeve separates the vent from the cup body, and the replenishment enters the battery's injection hole directly from the injection pipe. Since the injection pipe is inserted under negative pressure, the inside of the battery is still in a negative pressure environment, making secondary injection easier.

[0023] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A temporary storage cup for negative pressure formation of lithium batteries, characterized in that: The invention comprises a sealed cup body (1), wherein a liquid inlet pipe (2) for connecting to a liquid injection hole of a battery is vertically arranged at the bottom of the cup body (1), and a guide hole is arranged coaxially and directly opposite to the liquid inlet pipe (2) at the top of the cup body (1), and a liquid injection pipe (3) is slidably and sealedly fitted in the guide hole, the lower end of the liquid injection pipe (3) extends into the liquid inlet pipe (2), and the lower end of the liquid injection pipe (3) has a vent hole penetrating in the radial direction, and a sealing sleeve (4) is arranged in the liquid inlet pipe (2) and is slidably and sealably fitted with the liquid injection pipe (3), so that the vent hole can move up and down with the liquid injection pipe (3) to the top or bottom of the sealing sleeve (4); the top of the cup body (1) also has an air inlet pipe arranged through it.

2. The temporary storage cup for negative pressure formation of lithium battery according to claim 1, characterized in that: The bottom of the cup body (1) is funnel-shaped, and the liquid inlet pipe (2) is connected and arranged at the lowest point of the cup body (1).

3. The temporary storage cup for negative pressure formation of lithium battery according to claim 1, characterized in that: The bottom of the cup body (1) has a through-going lower threaded hole, the upper end of the liquid inlet pipe (2) has an external threaded pipe section matching the lower threaded hole, and the liquid inlet pipe (2) is detachably connected to the lower threaded hole via the external threaded pipe section.

4. The temporary storage cup for negative pressure formation of lithium battery according to claim 3, characterized in that: The lower end of the externally threaded pipe section has a flange protruding radially, the outer end of the lower threaded hole is provided with a sealing surface facing the flange, and the flange is equipped with an annular sealing gasket; the length of the externally threaded pipe section is smaller than the length of the lower threaded hole, and is sealingly screwed on the lower threaded hole.

5. The temporary storage cup for negative pressure formation of lithium battery according to claim 3, characterized in that: The top of the cup body (1) has an upper threaded hole coaxially arranged with the lower threaded hole, and is detachably connected to a liquid injection seat (5), the guide hole being arranged through the liquid injection seat (5), and the liquid injection seat (5) having a liquid inlet hole arranged radially through the guide hole; the upper end of the liquid injection tube (3) has a liquid inlet extending radially through the guide hole, and the top is closed; the lower end of the guide hole has a sealing ring cooperating with the liquid injection tube (3), and the upper end of the guide hole has a sealing section cooperating with the liquid injection tube (3) in a sliding sealing manner, and the length of the sealing section is greater than the diameter of the liquid inlet; the distance between the liquid inlet and the vent hole is smaller than the distance between the liquid inlet and the sealing sleeve (4), so that when the vent hole is located in the cup body (1), the liquid inlet is sealed in the sealing section, and when the liquid inlet is located at the liquid inlet, the vent hole is located below the sealing sleeve (4).

6. The temporary storage cup for negative pressure formation of lithium battery according to claim 5, characterized in that: A group of sealing rings are respectively arranged at the two ends of the sealing section.

7. The temporary storage cup for negative pressure formation of lithium battery according to claim 5, characterized in that: The guide hole has an annular groove formed by radial depression, and the liquid inlet hole is arranged on the groove wall of the annular groove.

8. The temporary storage cup for negative pressure formation of lithium battery according to claim 1, characterized in that: The cup body (1) is integrally injection molded.

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