Anti-streaming busbar and negative pressure system of lithium ion battery
By designing an anti-crossflow busbar and a negative pressure system, the problems of battery leakage and equipment corrosion caused by electrolyte backflow were solved, thus achieving the stability of the electrolyte inside the battery and equipment protection.
Patent Information
- Application Number
- CN202420198915.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-27
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-01-27
AI Technical Summary
During battery manufacturing, electrolyte can easily flow back in the negative pressure formation process, leading to an increase in electrolyte inside the battery, causing problems such as leakage and equipment corrosion.
Design a cross-current prevention manifold with a manifold orifice at the bottom and an annular flange for connection to a negative pressure system. The electrolyte is discharged through the negative pressure orifice to prevent backflow. Stainless steel material and Teflon tubing are used. A condenser and a vacuum breaking valve are installed to control the negative pressure.
It effectively prevents electrolyte backflow, avoids excessive electrolyte inside the battery and equipment corrosion, ensures stable battery performance, and prevents electrolyte leakage.
Smart Images
Figure CN222338335U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lithium batteries, in particular to an anti-cross-current busbar and a negative pressure system of a lithium-ion battery. Background Art
[0002] In the battery manufacturing process, the negative pressure formation process usually adopts multi-channel parallel negative pressure pipelines. The parallel pipelines are interconnected, and the negative pressure pipelines are connected to the inside of the battery cell. Under the action of negative pressure, part of the electrolyte inside the battery cell will be drawn out, and the electrolyte will be collected in the bus. The electrolyte in the bus may randomly flow back into the battery, resulting in an increase in the electrolyte inside the battery, causing leakage, causing irreversible contamination of the battery and corrosion to the components in the equipment. Utility Model Content
[0003] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is: how to provide an anti-cross-flow bus and negative pressure system with an ingenious structural design that can prevent electrolyte backflow and avoid electrolyte leakage inside the battery.
[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:
[0005] A cross-current prevention busbar for a lithium-ion battery, characterized in that it comprises a busbar that is overall strip-shaped and arranged transversely, wherein the busbar has a busbar cavity arranged along the length direction, the bottom of the busbar cavity has a through-going busbar hole, and one end of the busbar hole facing the busbar cavity has a protruding annular flange; a plurality of the busbar holes are evenly distributed along the length direction of the busbar; the busbar also has a negative pressure hole for connecting to a negative pressure system, and the negative pressure hole is communicated with the busbar cavity.
[0006] When in use, the confluence hole is connected to the injection port of the battery through the negative pressure suction nozzle, and the negative pressure hole is connected to the negative pressure system. During the formation process, part of the electrolyte in the battery enters the confluence cavity through the confluence hole under the action of negative pressure. Since the confluence hole is arranged at the bottom of the confluence cavity and the inner end has a protruding annular flange, the electrolyte entering the confluence cavity cannot flow back to the battery from any confluence hole due to the obstruction of the annular flange, which can prevent the contaminated electrolyte from flowing back to the battery and affecting the battery performance, and can also prevent the increase of electrolyte inside the battery and the generation of bubbling, and prevent the bubbling from corroding the battery shell and internal components of the battery processing equipment.
[0007] Furthermore, the negative pressure hole is located at the bottom of the bus cavity and at one end of the bus bar.
[0008] In this way, the electrolyte entering the confluence chamber can be pumped out by the negative pressure system through the negative pressure hole, thereby preventing the electrolyte from accumulating in the confluence chamber and overflowing back into the battery.
[0009] Furthermore, the bottom surface of the confluence cavity has a slope that is tilted downward toward the negative pressure hole.
[0010] In this way, the electrolyte in the confluence cavity can flow to the negative pressure hole better.
[0011] Furthermore, the busbar is made of stainless steel.
[0012] Furthermore, the height of the annular flange is 2 to 5 mm.
[0013] Furthermore, 10 to 15 of the bus holes are equidistantly arranged along the length direction of the bus bar.
[0014] A negative pressure system, characterized in that it includes the anti-sequential flow bus as described above, the negative pressure hole of the anti-sequential flow bus is connected to a vacuum proportional valve through a negative pressure pipeline, and the vacuum proportional valve is connected to a vacuum source through a vacuum pipeline.
[0015] Furthermore, a condenser is connected in series on the negative pressure pipeline between the anti-series flow bus and the vacuum proportional valve.
[0016] Furthermore, a vacuum breaking valve is provided on the negative pressure pipeline between the condenser and the anti-cross-flow bus.
[0017] Furthermore, the negative pressure pipeline is a Teflon tube.
[0018] In summary, the utility model has the advantages of clever structural design, being able to prevent electrolyte backflow and avoiding electrolyte leakage inside the battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is an overall schematic diagram of the negative pressure system.
[0020] Figure 2 The overall structure diagram of the busbar is shown in FIG.
[0021] Figure 3 for Figure 2 Schematic diagram of the partially enlarged structure. DETAILED DESCRIPTION
[0022] The utility model is further described in detail below in conjunction with the embodiments.
[0023] When implementing: Figure 1 to Figure 3As shown, a negative pressure system for battery formation includes a cross-current prevention busbar, the cross-current prevention busbar includes a busbar 1 that is overall strip-shaped and arranged horizontally, the busbar 1 has a confluence cavity 2 arranged along the length direction, the bottom of the confluence cavity 2 has a through-set confluence hole 3, and the confluence hole 3 has a protruding annular flange 4 at one end of the confluence cavity 2; the confluence holes 3 are evenly distributed along the length direction of the busbar 1; the busbar 1 also has a negative pressure hole 5 for connecting a negative pressure system, and the negative pressure hole 5 is connected to the confluence cavity 2. The negative pressure hole 5 is located at the bottom of the confluence cavity 2 and at one end of the busbar 1, and the bottom surface of the confluence cavity 2 has a slope that is inclined downward toward the negative pressure hole 5.
[0024] like Figure 1 As shown, the negative pressure hole 5 is connected to the vacuum proportional valve 6 through a negative pressure pipeline, and the vacuum proportional valve 6 is connected to the vacuum source through a vacuum pipeline; a condenser 7 is connected in series on the negative pressure pipeline between the anti-sequential flow bus and the vacuum proportional valve 6; a vacuum breaking valve 8 is provided on the negative pressure pipeline between the condenser 7 and the anti-sequential flow bus. In order to prevent the negative pressure pipeline from being corroded by the electrolyte, in this embodiment, the negative pressure pipeline is a Teflon tube.
[0025] When in use, the confluence hole is connected to the injection port of the battery through the negative pressure nozzle. During the formation process, part of the electrolyte in the battery enters the confluence cavity through the confluence hole under the action of negative pressure. Since the confluence hole is set at the bottom of the confluence cavity and the inner end has a protruding annular flange, the electrolyte entering the confluence cavity cannot flow back to the battery from any confluence hole under the obstruction of the annular flange, which can not only prevent the contaminated electrolyte from flowing back to the battery to affect the battery performance, but also prevent the increase of electrolyte inside the battery and the generation of liquid, and prevent the corrosion of the battery shell and the internal components of the battery processing equipment by the liquid. The electrolyte in the confluence cavity enters the negative pressure pipeline under the action of negative pressure.
[0026] In this embodiment, the busbar 1 is made of stainless steel, 10 to 15 busbar holes 3 are evenly spaced along the length direction of the busbar 1, and the height of the annular flange 4 is 2 to 5 mm.
[0027] 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 lithium-ion battery anti-cross-current busbar, characterized in that: The invention comprises a busbar (1) which is in the shape of a strip and is arranged transversely, wherein the busbar (1) has a busbar cavity (2) arranged along the length direction, the bottom of the busbar cavity (2) has a busbar hole (3) arranged through, and one end of the busbar hole (3) facing the busbar cavity (2) has a protruding annular flange (4); a plurality of the busbar holes (3) are evenly distributed along the length direction of the busbar (1); the busbar (1) also has a negative pressure hole (5) for connecting to a negative pressure system, and the negative pressure hole (5) is connected to the busbar cavity (2).
2. The anti-cross-current busbar for lithium-ion batteries according to claim 1, characterized in that: The negative pressure hole (5) is located at the bottom of the busbar cavity (2) and at one end of the busbar (1).
3. The anti-cross-current busbar for lithium-ion batteries as claimed in claim 2, characterized in that: The bottom surface of the confluence chamber (2) has a slope that is arranged to be inclined downwards towards the negative pressure hole (5).
4. The anti-cross-current busbar for lithium-ion batteries according to claim 1, wherein: The busbar (1) is made of stainless steel.
5. The anti-cross-current busbar for lithium-ion batteries as claimed in claim 1, characterized in that: The height of the annular flange (4) is 2 to 5 mm.
6. The anti-cross-current busbar for lithium-ion batteries as claimed in claim 1, characterized in that: There are 10 to 15 bus holes (3) arranged equidistantly along the length direction of the bus bar (1).
7. A negative pressure system, characterized in that: It comprises the anti-cross-flow bus as claimed in any one of claims 1 to 6, wherein the negative pressure hole of the anti-cross-flow bus is connected to a vacuum proportional valve (6) through a negative pressure pipeline, and the vacuum proportional valve (6) is connected to a vacuum source through a vacuum pipeline.
8. The negative pressure system according to claim 7, characterized in that: A condenser (7) is connected in series to the negative pressure pipeline between the anti-sequential flow bus and the vacuum proportional valve (6).
9. The negative pressure system according to claim 8, characterized in that: A vacuum breaking valve (8) is provided on the negative pressure pipeline between the condenser (7) and the anti-cross-flow busbar.
10. The negative pressure system according to claim 7, characterized in that: The negative pressure pipeline is a Teflon tube.