Battery formation electrolyte backflow device

Abstract

The utility model discloses a battery formation electrolyte backflow device, and belongs to the technical field of batteries. The battery formation electrolyte backflow device comprises a liquid accumulation cup, an exhaust pipe is arranged at the top of the liquid accumulation cup and connected with an exhaust cylinder of a formation cabinet, a liquid inlet pipe is arranged at the bottom of the liquid accumulation cup and connected with a battery negative electrode liquid injection port, an adapter pipe for injecting compressed gas into the exhaust pipe is arranged on the exhaust pipe, and the adapter pipe is connected with an air compressor. By adopting the battery formation electrolyte backflow device, the problems that the electrolyte is easy to leak and the backflow efficiency is relatively low in the existing battery formation process can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially is related to a battery formation electrolyte backflow device. BACKGROUND

[0002] Battery formation is a key step in the battery manufacturing process, aiming to activate the positive and negative materials inside the battery through charge and discharge cycles to improve the overall performance of the battery. The main purpose of this process is to stimulate the active material in the battery, so that the lithium-ion battery enters the "activation" state. During the first charging process, an electrochemical reaction occurs inside the battery, forming a layer of solid electrolyte interface film (SEI film) on the interface between the negative electrode and the electrolyte. SEI film effectively prevents the continuous occurrence of side reactions, reduces the loss of lithium in the battery, and maintains the overall capacity, cycle life, and rate performance of the battery.

[0003] During the formation process, specific gases are generated, and their composition and quantity change with the change of the formation voltage. During the formation process, the gases inside the battery need to be discharged, and the electrolyte will be lost during the discharge process, which affects the capacity of the battery. Therefore, during the battery formation process, the electrolyte needs to be backflowed into the battery while the gas is discharged. The existing electrolyte backflow method is to connect the battery negative electrode liquid injection hole with a corrosion-resistant hose. During the formation, the liquid level column in the hose is high, and the electrolyte backflow is slow, which affects the formation efficiency.

[0004] The existing patent CN108598578A discloses a lithium-ion battery formation anti-spray liquid device, which includes a connecting pipe assembly, a valve, a liquid accumulation chamber, and a communication pipe. The first end of the connecting pipe assembly is located outside the liquid accumulation chamber, and the second end of the connecting pipe assembly is located inside the liquid accumulation chamber. The first end of the connecting pipe assembly is open, and the second end of the connecting pipe assembly is closed. A backflow hole and a liquid discharge hole are provided on the connecting pipe assembly, and both the backflow hole and the liquid discharge hole are located inside the liquid accumulation chamber. The liquid discharge hole is located on the side of the backflow hole away from the first end of the connecting pipe assembly, and the diameter of the liquid discharge hole is larger than that of the backflow hole. The valve is installed on the connecting pipe assembly. The communication pipe communicates with the liquid accumulation chamber. In the above-mentioned patent, the valve is provided on the connecting pipe assembly, which provides negative pressure for the connecting pipe assembly. The negative pressure is beneficial to the spraying of the electrolyte. However, the connecting pipe assembly is the channel for electrolyte spraying and backflow, and the valve is easily leaked when it is set on the connecting pipe assembly. Moreover, the backflow of the electrolyte is under the action of gravity, and the backflow efficiency is relatively low. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a battery formation electrolyte backflow device, which solves the problem of electrolyte leakage and low backflow efficiency in the existing battery formation process.

[0006] In order to achieve the above object, the utility model provides a kind of battery formation electrolyte backflow device, including liquid accumulation cup, the top of liquid accumulation cup is provided with exhaust pipe, exhaust pipe is connected with the exhaust cylinder of formation cabinet, the bottom of liquid accumulation cup is provided with liquid inlet pipe, liquid inlet pipe is connected with battery negative pole liquid injection port, exhaust pipe is provided with adapter pipe for injecting compressed gas into exhaust pipe, adapter pipe is connected with air compressor.

[0007] Preferably, the liquid accumulation cup is a transparent corrosion-resistant cylindrical cup, and the bottom of the liquid accumulation cup is an arc-shaped structure with a low center.

[0008] Preferably, the bottom of the exhaust pipe is provided with a retaining ring, the top center of the liquid accumulation cup is provided with an upper mounting hole for mounting the exhaust pipe, the diameter of the retaining ring is greater than the hole diameter of the upper mounting hole; the exhaust pipe is a corrosion-resistant rubber pipe, and the exhaust pipe is sealingly connected with the upper mounting hole.

[0009] Preferably, the top of the exhaust pipe is provided with a connector, the inside of the connector is provided with a sealing rubber plug, or the connector is provided with a sealing valve.

[0010] Preferably, the adapter pipe includes a first connecting pipe and a second connecting pipe, the first connecting pipe and the second connecting pipe are an integral structure, the pipe diameter of the second connecting pipe is greater than the pipe diameter of the first connecting pipe, the first connecting pipe is sealingly connected with the exhaust pipe or is an integral structure, and the second connecting pipe is connected with the air compressor.

[0011] Preferably, the bottom center of the liquid accumulation cup is provided with a lower mounting hole for mounting the liquid inlet pipe, the liquid inlet pipe is a corrosion-resistant rubber pipe, the top of the liquid inlet pipe is provided with a retaining ring, the diameter of the retaining ring is greater than the hole diameter of the lower mounting hole, and the liquid inlet pipe is sealingly connected with the lower mounting hole.

[0012] Preferably, a baffle is arranged below the upper mounting hole, the baffle is located directly above the outlet of the liquid inlet pipe, the baffle is fixedly connected with the inner wall of the liquid accumulation cup, and a plurality of air vents are uniformly arranged on the side wall of the baffle.

[0013] Preferably, the liquid inlet pipe includes an inner pipe and an outer pipe, the outer pipe is sleeved outside the inner pipe and is fixedly connected with the inner pipe, the inner pipe has an open structure at both ends, the top end of the inner pipe is inserted into the inside of the liquid accumulation cup, the outer pipe is sealingly connected with the lower mounting hole, and the top end height of the inner pipe is higher than the top end height of the outer pipe; the top of the outer pipe is provided with a liquid inlet for electrolyte backflow, and the bottom of the outer pipe is provided with a plurality of liquid outlets; a liquid inlet prevention structure is arranged at the liquid outlet.

[0014] Preferably, the liquid inlet prevention structure includes an elastic membrane, the elastic membrane covers the outside of the liquid outlet, the elastic membrane and the bottom of the outer pipe are connected through a connecting area, the connecting area is uniformly distributed around the liquid outlet, and a drainage channel is formed between adjacent connecting areas.

[0015] The battery formation electrolyte backflow device has the following advantages and positive effects:

[0016] 1、In the bottom of the cup set liquid inlet pipe, liquid inlet pipe directly with the cup, the overflow of electrolyte directly into the cup, reducing the leakage and loss of electrolyte.

[0017] 2, the compressed gas through the exhaust pipe into the cup, to the cup, thereby accelerating the electrolyte in the cup backflow, improve the electrolyte backflow efficiency.

[0018] 3, the upper mounting hole below the baffle setting to avoid electrolyte into the exhaust pipe inside, the liquid inlet pipe into the inner tube and outer tube, the overflow of electrolyte and backflow channel separation, is conducive to the overflow of electrolyte, promote the discharge of gas; at the same time also facilitate the backflow of electrolyte.

[0019] 4, in the liquid outlet is provided with prevent liquid structure, prevent liquid structure effectively prevent the electrolyte into the inside of the outer tube, so that the electrolyte can smoothly backflow.

[0020] The following through the drawings and examples, the technical scheme of the utility model is described in further detail. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 for the structure of the utility model embodiment one schematic diagram;

[0022] Figure 2 for the adapter pipe installation structure of the utility model embodiment one schematic diagram;

[0023] Figure 3 for the cup structure of the utility model embodiment one schematic diagram;

[0024] Figure 4 for the cross section structure of the utility model embodiment one schematic diagram;

[0025] Figure 5 for the cross section structure of the utility model embodiment two schematic diagram;

[0026] Figure 6 for the baffle installation structure of the utility model embodiment two schematic diagram;

[0027] Figure 7 for the attached Figure 5 middle A enlarged view;

[0028] Figure 8 for the liquid inlet pipe bottom structure of the utility model embodiment two schematic diagram.

[0029] Reference signs

[0030] 1. Liquid collection cup; 2. Exhaust pipe; 3. Liquid inlet pipe; 4. Adapter pipe; 5. Connector; 6. First connecting pipe; 7. Second connecting pipe; 8. Upper mounting hole; 9. Retaining ring; 10. Baffle; 11. Vent hole; 12. Inner pipe; 13. Outer pipe; 14. Liquid inlet; 15. Liquid outlet; 16. Elastic membrane; 17. Connection area. Detailed Implementation

[0031] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0032] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0033] Example 1

[0034] like Figures 1-4 As shown, a battery formation electrolyte reflux device includes a collection cup 1, which is a transparent, corrosion-resistant cylindrical cup. The collection cup 1 can be made of transparent glass or transparent plastic glass. The collection cup 1 is used to store electrolyte that overflows from the battery, preventing electrolyte loss. The bottom of the collection cup 1 has a low-center arc-shaped structure, which facilitates the return of electrolyte from the bottom of the collection cup 1 into the battery. The transparent collection cup 1 makes it easy to observe the amount of electrolyte remaining in the collection cup 1.

[0035] The top of the liquid collection cup 1 is equipped with an exhaust pipe 2, which is a corrosion-resistant rubber tube. The exhaust pipe 2 has a certain degree of rigidity, which gives it good shape retention. Furthermore, the exhaust pipe 2 has a certain degree of elastic deformation to meet the requirements of bending deformation. An upper mounting hole 8 for installing the exhaust pipe 2 is located at the center of the top of the liquid collection cup 1, and the exhaust pipe 2 is sealed to the upper mounting hole 8 by a rubber sealing ring.

[0036] The bottom of the exhaust pipe 2 is provided with a check ring 9 which is integrated with the exhaust pipe 2. The diameter of the check ring 9 is larger than the hole diameter of the upper mounting hole 8. During installation, the bottom of the exhaust pipe 2 is deformed by extrusion, the check ring 9 is inserted into the inside of the liquid cup 1 through the upper mounting hole 8, and the check ring 9 is blocked at the upper mounting hole 8, thereby improving the stability of the installation of the exhaust pipe 2 and preventing the exhaust pipe 2 from being easily separated from the liquid cup 1. The exhaust pipe 2 is connected with the exhaust cylinder of the formation cabinet, and the gas in the liquid cup 1 is discharged into the exhaust cylinder.

[0037] The top of the exhaust pipe 2 is provided with a connector 5 which is coaxially integrated with the exhaust pipe 2. The inside of the connector 5 is provided with a sealing plug, or a sealing valve is arranged on the connector 5. The sealing valve can be an existing manual valve or an electromagnetic valve. The opening or closing of the exhaust pipe 2 is controlled by the sealing plug or the sealing valve.

[0038] The bottom of the liquid cup 1 is provided with a liquid inlet pipe 3 which is connected with the negative electrode liquid injection port of the battery. The electrolyte overflowing in the battery flows into the liquid cup 1 through the liquid inlet pipe 3 for collection. The liquid inlet pipe 3 is a corrosion-resistant rubber pipe with certain rigidity and elastic deformation. The bottom center of the liquid cup 1 is provided with a lower mounting hole for mounting the liquid inlet pipe 3, and the liquid inlet pipe 3 is sealingly connected with the lower mounting hole through a rubber sealing ring. The top of the liquid inlet pipe 3 is provided with a check ring which is integrated with the liquid inlet pipe 3. The diameter of the check ring is larger than the hole diameter of the lower mounting hole, and the check ring is blocked at the lower mounting hole to prevent the liquid inlet pipe 3 from easily falling off the liquid cup 1.

[0039] The exhaust pipe 2 is provided with an adapter pipe 4 for injecting compressed gas into the exhaust pipe 2. The adapter pipe 4 includes a first connecting pipe 6 and a second connecting pipe 7 which are integrated. The pipe diameter of the second connecting pipe 7 is larger than that of the first connecting pipe 6, which is conducive to the entry of compressed gas into the exhaust pipe 2. The first connecting pipe 6 is sealingly fixedly connected with the exhaust pipe 2 or is integrated with the exhaust pipe 2. The second connecting pipe 7 is connected with an air compressor. A control valve is arranged on the pipeline of the first connecting pipe 6, the second connecting pipe 7 or the second connecting pipe 7 connected with the air compressor, for controlling the opening or closing of the adapter pipe 4. The air compressor injects compressed gas into the exhaust pipe 2 through the second connecting pipe 7 and the first connecting pipe 6, the top end of the exhaust pipe 2 is sealed by a sealing plug or a sealing valve, the compressed gas enters the liquid cup 1 through the exhaust pipe 2, and the liquid cup 1 is pressurized, thereby accelerating the reflux of the electrolyte in the liquid cup 1 and improving the reflux efficiency of the electrolyte.

[0040] Example Two

[0041] As Figures 5-8The embodiment is different from the embodiment one in that a baffle 10 is arranged below the upper mounting hole 8 and directly above the outlet of the liquid inlet pipe 3. The baffle 10 is fixedly connected with the inner wall of the liquid cup 1 and has a blocking effect on the electrolyte to avoid the electrolyte entering the exhaust pipe 2. The side wall of the baffle 10 is uniformly provided with a plurality of air holes 11, and the gas in the liquid cup 1 enters the exhaust pipe 2 through the air holes 11 and is discharged.

[0042] The liquid inlet pipe 3 comprises an inner pipe 12 and an outer pipe 13, and the outer pipe 13 is sleeved outside the inner pipe 12 and fixedly connected with the inner pipe 12 or is an integral structure. The inner pipe 12 has an open structure at both ends, the top end of the inner pipe 12 is inserted into the inside of the liquid cup 1, and the bottom end of the inner pipe 12 is located at the liquid injection port of the negative electrode of the battery. The electrolyte enters the inner pipe 12 through the bottom end of the inner pipe 12 and then flows into the liquid cup 1 through the top end of the inner pipe 12. The outer pipe 13 is sealingly connected with the lower mounting hole through a rubber sealing ring. The top end of the inner pipe 12 is higher than the top end of the outer pipe 13 to avoid the backflow of the electrolyte through the inner pipe 12. The top of the outer pipe 13 is provided with a liquid inlet 14 for the backflow of the electrolyte, the electrolyte enters the space between the inner pipe 12 and the outer pipe 13 through the liquid inlet 14, and then flows back into the battery through the backflow channel formed by the inner pipe 12 and the outer pipe 13. The bottom of the outer pipe 13 is provided with a plurality of liquid outlets 15, and the electrolyte flows into the battery through the liquid outlets 15. The overflow channel and the backflow channel of the electrolyte are separated, which is beneficial to the overflow of the electrolyte and promotes the discharge of the gas, and also facilitates the backflow of the electrolyte.

[0043] In order to prevent the electrolyte from entering the backflow channel through the liquid outlet 15, a liquid inlet prevention structure is arranged at the liquid outlet 15. The liquid inlet prevention structure comprises an elastic film 16 which completely covers the outside of the liquid outlet 15. The elastic film 16 is connected with the bottom of the outer pipe 13 through a connecting area 17, the connecting area 17 is uniformly distributed around the liquid outlet 15, and the adjacent connecting areas 17 form a liquid discharge channel. The connecting area 17 can be formed by hot melting or gluing. The electrolyte in the backflow channel deforms the elastic film 16 under the action of gravity, the inlet of the liquid discharge channel is opened, and the electrolyte flows back into the battery through the liquid discharge channel. Under the action of compressed gas, the electrolyte is more prone to backflow. The splashed electrolyte in the battery exerts an upward force on the elastic film 16, and the deformation of the elastic film 16 further blocks the liquid discharge channel, so that the electrolyte cannot enter the backflow channel through the elastic film 16, thereby achieving the purpose of preventing liquid from entering.

[0044] Therefore, the battery formation electrolyte backflow device can solve the problems of easy leakage of electrolyte and low backflow efficiency in the existing battery formation process.

[0045] It should be pointed out finally that: the above examples are only used to illustrate the technical solutions of the utility model and not to limit them, although the utility model has been explained in detail with reference to the preferred embodiments, ordinary skilled in the art should understand that: its still can modify or equivalent replace the technical solutions of the utility model, and these modifications or equivalent replacements also can not make the modified technical solutions deviate from the spirit and scope of the technical solutions of the utility model.

Claims

1. A battery formation electrolyte reflux device, characterized in that: It includes a liquid collection cup, an exhaust pipe at the top of the liquid collection cup, which is connected to the exhaust cylinder of the formation cabinet, an inlet pipe at the bottom of the liquid collection cup, which is connected to the battery negative terminal liquid injection port, and an adapter pipe for injecting compressed gas into the exhaust pipe, which is connected to an air compressor.

2. The battery formation electrolyte reflux device according to claim 1, characterized in that: The liquid collection cup is a transparent, corrosion-resistant cylindrical cup with a low-center arc-shaped bottom.

3. The battery formation electrolyte reflux device according to claim 1, characterized in that: The bottom of the exhaust pipe is provided with a retaining ring, and the top center of the liquid collection cup is provided with an upper mounting hole for installing the exhaust pipe. The diameter of the retaining ring is larger than the diameter of the upper mounting hole. The exhaust pipe is a corrosion-resistant rubber tube, and the exhaust pipe is sealed to the upper mounting hole.

4. The battery formation electrolyte reflux device according to claim 1, characterized in that: The exhaust pipe is provided with a connector at the top, and the connector is provided with a sealing plug inside, or a sealing valve is provided on the connector.

5. The battery formation electrolyte reflux device according to claim 1, characterized in that: The adapter pipe includes a first connecting pipe and a second connecting pipe. The first connecting pipe and the second connecting pipe are integral structures. The diameter of the second connecting pipe is larger than that of the first connecting pipe. The first connecting pipe is sealed to the exhaust pipe or is integral with it. The second connecting pipe is connected to the air compressor.

6. The battery formation electrolyte reflux device according to claim 1, characterized in that: The bottom center of the liquid collection cup is provided with a lower mounting hole for installing a liquid inlet pipe. The liquid inlet pipe is a corrosion-resistant rubber tube. A retaining ring is provided at the top of the liquid inlet pipe. The diameter of the retaining ring is larger than the diameter of the lower mounting hole. The liquid inlet pipe is sealed to the lower mounting hole.

7. The battery formation electrolyte reflux device according to claim 3, characterized in that: A baffle is provided below the upper mounting hole. The baffle is located directly above the outlet of the liquid inlet pipe and is fixedly connected to the inner wall of the liquid collection cup. Several vent holes are evenly arranged on the side wall of the baffle.

8. The battery formation electrolyte reflux device according to claim 6, characterized in that: The inlet pipe includes an inner pipe and an outer pipe. The outer pipe is sleeved on the outside of the inner pipe and fixedly connected to the inner pipe. The inner pipe has an open structure at both ends. The top end of the inner pipe is inserted into the inside of the liquid collection cup. The outer pipe is sealed to the lower mounting hole. The top end of the inner pipe is higher than the top end of the outer pipe. The top of the outer pipe is provided with an inlet for electrolyte backflow. The bottom of the outer pipe is provided with several outlets. An anti-ingress structure is provided at the outlet.

9. A battery formation electrolyte reflux device according to claim 8, characterized in that: The anti-liquid ingress structure includes an elastic membrane that covers the outside of the liquid outlet. The elastic membrane is connected to the bottom of the outer tube through a connection area. The connection areas are evenly distributed around the liquid outlet, and a drainage channel is formed between adjacent connection areas.

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