Buffer device for improving process loss of lithium ion battery electrolyte
By designing a buffer device with a unidirectional flow structure, the problem of electrolyte loss during lithium-ion battery manufacturing was solved, achieving efficient electrolyte flow and reducing loss, thereby improving injection efficiency and reducing manufacturing costs.
Patent Information
- Application Number
- CN202423268336.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2034-12-30
AI Technical Summary
In the existing lithium-ion battery manufacturing process, electrolyte loss occurs during processes such as electrolyte injection, formation, and helium return and nailing. Furthermore, existing equipment has poor versatility and cannot effectively reduce electrolyte loss.
Design a buffer device with a unidirectional flow structure, consisting of multiple substructures, each containing a main flow channel and a secondary flow channel, with an inclination angle of 15°-60°, for use in various tooling processes of lithium-ion battery manufacturing, to reduce reverse flow of electrolyte and improve flow efficiency.
It effectively reduces electrolyte loss, improves injection efficiency, reduces electrolyte loss during formation, reduces appearance defects, and avoids increased manufacturing costs.
Smart Images
Figure CN223680165U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to buffer device technical field, especially a kind of buffer device for lithium ion battery electrolyte process loss improvement. BACKGROUND
[0002] In the first half of 1990s, in order to meet the demand of camera miniaturization and light weight, the first commercial lithium ion battery for household appliances was launched on the market. This innovative product immediately triggered a hot response in the market and was quickly applied to the rapidly popular mobile phones, and the market demand soared instantly. Since then, the application range of lithium ion battery has been expanding, and has penetrated into various fields of our daily life. Today, whether it is a smart phone, a notebook computer, or an electric vehicle, an electric bicycle and other fields, lithium ion battery has been widely used, and its high efficiency, long life and environmental protection characteristics make it the preferred power supply for many electronic products.
[0003] Electrolyte is one of the four key materials of lithium battery, and it plays an important role in transporting lithium ions. In the battery manufacturing process, electrolyte is closely related to electrolyte injection, formation, helium back drilling and other processes, and there is a problem that electrolyte may be sucked out under negative pressure condition, resulting in insufficient injection amount. For example, lithium ion battery generally uses vacuum extraction and inflation to inject liquid, and the process of vacuum extraction will form pressure on the surface of electrolyte, while the pressure will be released during the inflation process, which often causes part of the electrolyte to be sucked out from the inside of the battery, resulting in insufficient injection amount and the need for liquid supplement, reducing the injection efficiency; The formation process needs to be carried out under negative pressure condition due to electrolyte decomposition and gas production, and part of the electrolyte will be carried out during the gas production process, especially for lithium battery with high gas production, long time negative pressure will cause large electrolyte loss, resulting in insufficient electrolyte injection, internal liquid shortage of battery during formation process, difficult secondary injection, different electrolyte proportion and design value, etc.; Helium back drilling also has the problem of insufficient injection amount caused by vacuum extraction of electrolyte. In addition, electrolyte may be splashed during the above processes, resulting in frequent cleaning of equipment and tooling and increasing the number of battery appearance defects. Therefore, a buffer device capable of being installed on various toolings is needed to reduce electrolyte loss during the manufacturing process of lithium ion battery.
[0004] The devices currently available for improving electrolyte loss in the liquid injection and formation process have poor universality and are only used in single process, and each device has its own drawbacks. For example, patent CN211829011U introduces a kind of anti-splash plug for liquid injection, which can reduce the electrolyte loss in the liquid injection process, but the electrolyte flowability is poor compared with the straight-through structure, the liquid injection efficiency is low, and it can only be used in the liquid injection process; patent CN220041970U introduces a kind of formation negative pressure cup, the structure is relatively complex, the manufacturing cost is high, and it can only be used in the formation process; patent CN216958146U introduces a kind of buffer cup structure for improving the electrolyte loss in the formation process, the structure is relatively simple, but the horizontal baffle structure is not conducive to the flow of electrolyte, the backflow effect is poor and it cannot be used in the liquid injection process. Practical new type content
[0005] The utility model aims at overcoming the insufficient and defect of prior art, and provides a kind of for electrolyte process loss improvement of lithium ion battery electrolyte process for being installed to the various tooling of lithium ion battery production process, to reduce electrolyte loss in the process of lithium ion battery manufacturing.
[0006] A kind of buffer device for improving electrolyte loss of lithium ion battery, including shell, internal buffer structure is arranged in the shell, the upper end of the shell has electrolyte inlet, the lower end of the shell has electrolyte outlet, the upper end and the lower end of the internal buffer structure are respectively connected with electrolyte inlet, electrolyte outlet;The internal buffer structure is one-way flow structure, is connected by at least three substructures, the direction of adjacent two substructures is opposite and is symmetric, and multiple substructures continuously hinder the reverse flow of electrolyte;Each substructure can make the electrolyte that enters flow into two flow channels thereof, and after merging after flowing out of two flow channels, flow out to next substructure or flow out of buffer device.
[0007] Wherein, each of the substructure includes two interconnected pipelines, two pipelines include a main flow channel and a secondary flow channel, the main flow channel is linear, and is arranged obliquely relative to the axis direction of the shell, the secondary flow channel includes a linear pipeline arranged obliquely relative to the axis direction of the shell and an arc-shaped pipeline connecting the linear pipeline and the main flow channel.
[0008] Wherein, the oblique direction of the linear pipeline of the main flow channel and the secondary flow channel is opposite.
[0009] Wherein, the oblique angle between the main flow channel and the linear pipeline is 15°-60°.
[0010] Wherein, the oblique angle between the main flow channel and the linear pipeline is 30°-45°.
[0011] Wherein, the outer surface of the tubular body of the electrolyte outlet is provided with a spring.
[0012] The electrolyte inlet is connected with one of an injection cup of an injection tool, a negative pressure pipeline of a formation equipment or a helium back-punching equipment.
[0013] The shell and the internal buffering structure are made of PE material resistant to electrolyte corrosion.
[0014] The electrolyte inlet and the electrolyte outlet extend outside the shell.
[0015] The internal buffering structure is integrally formed with the electrolyte inlet and the electrolyte outlet.
[0016] The buffering device for improving electrolyte process loss of the lithium ion battery has the internal buffering structure of the one-way flow structure, is composed of at least three sub-structures connected, and is opposite to each other in direction and symmetrical, and the multiple sub-structures continuously hinder the reverse flow of the electrolyte; each sub-structure can make the entering electrolyte flow into two flow channels thereof, and after flowing out of the two flow channels and being combined, flows out to the next sub-structure or the buffering device, so that the electrolyte loss problem in the processes of liquid injection, formation and helium back-punching of the lithium ion battery is improved, the liquid injection efficiency can be effectively improved, the formation liquid loss amount is reduced, the liquid injection amount defect is reduced, the appearance defect caused by electrolyte spatter is reduced, and the increase of manufacturing cost caused by electrolyte waste is avoided. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 is a buffering device for improving electrolyte process loss of the lithium ion battery according to the utility model;
[0018] Figure 2 is a buffering device for improving electrolyte process loss of the lithium ion battery according to the utility model;
[0019] Figure 3 is a buffering device for improving electrolyte process loss of the lithium ion battery according to the utility model;
[0020] Figure 4 is a buffering device for improving electrolyte process loss of the lithium ion battery according to the utility model.
[0021] MARKS OF THE DRAWINGS:
[0022] 1-electrolyte inlet, 2-shell, 3-internal buffering structure, 4-spring, 5-electrolyte outlet, 6-injection cup, 7-buffering device, 8-bracket, 9-supporting pad plate, 10-battery fixing groove, 11-bottom plate. DETAILED DESCRIPTION
[0023] The utility model will be made further detailed description below combining with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely used to explain the utility model, and are not used to limit the utility model.
[0024] As Figures 1 to 3 shown, the buffer device for improving the process loss of lithium ion battery electrolyte includes a shell 2, an internal buffer structure 3 is arranged in the shell 2, the upper end of the shell 2 has an electrolyte inlet 1, and the lower end of the shell 2 has an electrolyte outlet 5.
[0025] In a preferred embodiment, the internal buffer structure 3 is a one-way flow structure composed of three or more substructures, and the directions of two adjacent substructures are opposite and symmetrical, and the multiple substructures continuously hinder the reverse flow of the electrolyte.
[0026] In an embodiment, each of the substructures includes two pipelines, a main flow channel 3a and a secondary flow channel. The main flow channel 3a is linear, and is arranged obliquely relative to the axis direction of the shell. The secondary flow channel includes a linear pipeline 3b arranged obliquely relative to the axis direction of the shell and an arc-shaped pipeline 3c connecting the linear pipeline and the main flow channel.
[0027] Preferably, the oblique angle between the main flow channel 3a and the linear pipeline 3b is 15°-60°.
[0028] The electrolyte inlet 1 can be connected to one of an injection cup of an injection tool, a negative pressure pipeline of a formation device or a helium back-punching device, and the electrolyte outlet 5 is directly connected to a battery injection hole.
[0029] Further, the tubular body of the electrolyte outlet 5 is provided with a spring 4, and the spring 4 enables the buffer device to be tightly connected to the battery.
[0030] The shell 2 and the internal buffer structure 3 are made of PE material resistant to electrolyte corrosion.
[0031] The working principle of the buffer device for improving the process loss of lithium ion battery electrolyte is as shown in Figure 2 , 3 As Figure 2 shown, when the electrolyte flows forward, the electrolyte will be divided into two streams at the first branch, and the two streams will converge at the second branch, and the flow directions of the two streams are the same, which can accelerate the flow of the electrolyte, and at this time, the electrolyte flows more smoothly; as Figure 3As shown, when the electrolyte flows in the opposite direction, it will also split into two streams at the first branch. However, when they converge again at the second branch, the two streams flow in opposite directions, forming a vortex that causes energy loss. At this time, the electrolyte is difficult to flow, so that it can only flow unidirectionally from the inlet to the outlet.
[0032] Taking a manual liquid filling fixture for square lithium-ion batteries as an example, such as Figure 4 As shown, the overall structure of the manual electrolyte filling fixture for square lithium-ion batteries includes an filling cup 6, a buffer device 7, a bracket 8, a support pad 9, a battery fixing groove 10, and a base plate 11. The battery fixing groove is fixed on the base plate. The support pad 9 is installed above the battery fixing groove 10 through the bracket 8 and has the buffer device 7 of this invention on it. The support pad has holes, and the electrolyte outlet of the buffer device 7 is installed in the holes on the support pad and then connected to the battery filling hole. The electrolyte inlet of the buffer device is connected to the outlet of the filling cup.
[0033] like Figure 4 As shown, during the electrolyte injection process, the electrolyte is poured into the injection cup 6, the battery is placed in the battery fixing groove 10, and the entire device is placed in a vacuum chamber for vacuuming and inflation. This allows the electrolyte to flow into the battery positioned on the battery fixing groove 10 through the buffer device. At this time, the vacuuming process will create pressure on the surface of the electrolyte, while the inflation process will release the pressure, which may cause some electrolyte to be drawn out from the inside of the cell. However, the buffer structure of the buffer device 7 allows the electrolyte to flow smoothly in the forward direction and is blocked in the reverse direction. The drawn-out electrolyte can still flow back to the battery, reducing electrolyte loss during the injection process and improving the injection efficiency.
[0034] This invention improves the electrolyte loss problem in the process of lithium-ion battery injection, formation, and helium return nailing. It can effectively improve injection efficiency, reduce formation loss, reduce injection defects, reduce appearance defects caused by electrolyte splashing, and avoid increased manufacturing costs due to electrolyte waste.
[0035] In the lithium-ion battery manufacturing process, buffer devices that allow liquid to flow in only one direction are used to reduce electrolyte loss during the manufacturing process and can be applied to multiple steps in the lithium-ion battery manufacturing process.
[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic features of this utility model.
[0037] Thus, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the description given above, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
[0038] Furthermore, it should be understood that although the description herein is made on the basis of the embodiments, not every embodiment contains only one independent technical solution, and the description herein is only for the sake of clarity, and those skilled in the art should consider the description as a whole, and the technical solutions in each embodiment can be properly combined to form other embodiments which can be understood by those skilled in the art.
Claims
1. A buffer device for improvement of process loss in lithium ion battery electrolyte, characterized by, The application relates to a battery electrolyte buffer device, which comprises a shell, an internal buffer structure arranged in the shell, an electrolyte inlet at the upper end of the shell, an electrolyte outlet at the lower end of the shell, and the upper end and the lower end of the internal buffer structure are connected with the electrolyte inlet and the electrolyte outlet respectively; the internal buffer structure is a one-way flow structure and is composed of at least three substructures, two adjacent substructures are oppositely arranged in a mirror image, and the multiple substructures continuously hinder the reverse flow of electrolyte; each substructure can make the entering electrolyte flow into two flow channels, and the electrolyte flows out of the two flow channels, is combined and then flows out of the next substructure or the buffer device.
2. The buffer device for improving process loss of lithium ion battery electrolyte according to claim 1, wherein Each substructure comprises two interconnected pipelines, the two pipelines comprise a main flow channel and a secondary flow channel, the main flow channel is linear and is arranged to be inclined to the axis direction of the shell, and the secondary flow channel comprises a linear pipeline arranged to be inclined to the axis direction of the shell and an arc pipeline connecting the linear pipeline and the main flow channel.
3. The buffer device for improving process loss of lithium ion battery electrolyte according to claim 2, wherein The inclination direction of the linear pipeline of the main flow channel and the secondary flow channel is opposite.
4. The buffer device for improving process loss of lithium ion battery electrolyte according to claim 2, wherein The inclination angle between the main flow channel and the linear pipeline is 15-60 degrees.
5. The buffer device for improving process loss of lithium ion battery electrolyte according to claim 4, wherein The inclination angle between the main flow channel and the linear pipeline is 30-45 degrees.
6. The buffer device for improvement of process loss of electrolyte of lithium ion battery according to claim 1, wherein The outer surface of the tubular body of the electrolyte outlet is provided with springs.
7. The buffer device for improving process loss of lithium ion battery electrolyte according to claim 1, wherein The electrolyte inlet is connected with one of an electrolyte injection cup of an electrolyte injection tool, a negative pressure pipeline of a formation equipment or a helium back-punching equipment.
8. The buffer device for improving process loss of lithium ion battery electrolyte according to claim 1, wherein, The shell and the internal buffer structure are made of PE material which is resistant to electrolyte corrosion.
9. The buffer device for improving process loss of lithium ion battery electrolyte according to claim 1, wherein, The electrolyte inlet and the electrolyte outlet are arranged outside the shell.
10. The buffer device for improving process loss of electrolyte of lithium ion battery according to claim 1, wherein, The internal buffer structure, the electrolyte inlet and the electrolyte outlet are integrally formed.