Electrolyte buffer cup
By setting up a serpentine airflow channel, impeller, and staggered guide section in the buffer cup, the problem of large electrolyte loss under high negative pressure is solved, achieving efficient gas-liquid separation and electrolyte recovery, and reducing electrolyte waste.
Patent Information
- Application Number
- CN202422774931.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-14
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-11-14
AI Technical Summary
Existing buffer cups suffer significant electrolyte loss under high negative pressure conditions, resulting in poor separation of airflow and electrolyte and substantial electrolyte waste.
The design incorporates a serpentine airflow channel and impeller structure, combined with staggered guide sections. The airflow drives the impeller to rotate, blocking the electrolyte and increasing the airflow path length and flow resistance. The design of the blades and guide sections improves the gas-liquid separation efficiency, enabling electrolyte recovery.
Under high negative pressure conditions, electrolyte loss is significantly reduced, gas-liquid separation efficiency is improved, electrolyte waste is reduced, and effective electrolyte recovery is achieved.
Smart Images
Figure CN223527376U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to lithium ion battery manufacturing technical field especially relates to a kind of electrolyte buffer cup. BACKGROUND
[0002] Negative pressure formation process is one of the key steps in the production process of lithium ion battery, mainly used to activate the activity of positive and negative pole piece active material. In the negative pressure formation process, SEI film (solid electrolyte interface film) will be generated on the surface of negative electrode, and a certain amount of gas will be generated. In order to ensure that the gas in the cell can be quickly discharged, avoid the influence of bubble on the performance of cell, negative pressure formation structure is usually used to realize rapid exhaust during formation process. In the negative pressure formation structure, buffer cup is the main exhaust component.
[0003] The utility model with publication (announcement) No. CN216958146U discloses a buffer cup structure for improving lithium ion battery formation electrolyte loss, which can reduce the amount of electrolyte extracted by negative pressure during lithium ion battery formation, avoid the increase of manufacturing cost caused by electrolyte waste, and improve the secondary liquid injection rate.
[0004] As the above technical solution, by setting several upper and lower staggered baffles in the buffer cup to block the electrolyte, the electrolyte is not easy to be extracted from the buffer cup. But due to the single structure of the baffle, the separation effect of gas and electrolyte is poor, so under high negative pressure condition, electrolyte is still easy to be extracted with gas, resulting in large loss of electrolyte. UTILITY MODEL CONTENTS
[0005] Therefore, the utility model provides a kind of electrolyte buffer cup, which improves the gas-liquid separation effect by setting serpentine-shaped airflow channel and impeller, reduces the loss of electrolyte, and has smaller electrolyte loss under high negative pressure condition, solving the problem of large electrolyte loss of existing buffer cup under high negative pressure condition.
[0006] The technical scheme of the utility model is as follows:
[0007] The utility model provides a kind of electrolyte buffer cup a kind of electrolyte buffer cup, including cup body, wherein,
[0008] The top of the cup body is provided with busbar connecting port, and the bottom is provided with cell connecting port;
[0009] Further including impeller, wherein,
[0010] The inside of the cup body is provided with serpentine-shaped airflow channel along vertical direction, the channel port of the upper end of the airflow channel is communicated with the busbar connecting port, and the channel port of the lower end is communicated with the cell connecting port;
[0011] The impeller is arranged inside the cup body and at the passage opening of the airflow passage lower end.
[0012] Preferably, the impeller comprises a rotating shaft and blades, wherein,
[0013] The rotating shaft is horizontally arranged, and both ends of the rotating shaft are rotationally connected to the side wall of the cup body.
[0014] The blades are arranged in a plurality of circumferential annular arrays along the rotating shaft, and the blades are fixedly connected to the rotating shaft.
[0015] Preferably, the blade is bent in an L shape in a counterclockwise direction away from one end of the rotating shaft.
[0016] Preferably, the blade is vertically arranged at the side of the rotating shaft.
[0017] Preferably, the blade is arranged in an inclined manner in a counterclockwise direction.
[0018] Preferably, a first flow guide part in the form of a plate is arranged on the right side inside the cup body, and a second flow guide part in the form of a plate is arranged on the left side inside the cup body, wherein,
[0019] The first flow guide part is arranged above the impeller, and the second flow guide part is arranged on the left side of the impeller.
[0020] The first flow guide part and the second flow guide part are arranged in a plurality of intervals upwardly.
[0021] The plurality of second flow guide parts and the plurality of first flow guide parts are arranged in an alternating manner upwardly and laterally.
[0022] The airflow passage is formed between the second flow guide part and the first flow guide part.
[0023] Preferably, the adjacent ends of the second flow guide part and the first flow guide part are bent in an L shape downwardly.
[0024] Preferably, the second flow guide part and the first flow guide part are arranged horizontally.
[0025] Preferably, the adjacent ends of the second flow guide part and the first flow guide part are arranged in an inclined manner downwardly.
[0026] Preferably, the bottom of the cup body is in the form of a funnel.
[0027] The electrolyte buffering cup has the following beneficial effects compared with the prior art:
[0028] (1) By setting the serpentine-shaped airflow channel, the airflow path length is facilitated to be increased, the residence time of the airflow in the buffering cup is prolonged, the gas-liquid separation effect is effectively increased, the loss of electrolyte is small when used under high negative pressure, and the loss of electrolyte is effectively reduced.
[0029] (2) By setting the rotatable impeller at the passage opening of the lower end of the airflow channel, the impeller is rotated by the airflow, the electrolyte in the airflow is blocked and attached by the rotating impeller, the electrolyte carried by the airflow into the airflow channel is less, and the loss of electrolyte is further reduced.
[0030] (3) By setting the end of the blade away from the shaft to be bent in the counterclockwise direction to be L-shaped, the electrolyte attached to the blade is not easy to be thrown into the airflow channel, and the gas-liquid separation effect of the airflow channel is further improved.
[0031] (5) By setting the first flow guide part and the second flow guide part to be staggered, the flow resistance of the gas-liquid mixture is increased, the gas-liquid separation efficiency is further improved, and the risk of electrolyte being extracted is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0032] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.
[0033] Figure 1 It is a plane structure schematic diagram of the electrolyte buffering cup of the present application.
[0034] Figure 2 It is a partial perspective view of the electrolyte buffering cup of the present application.
[0035] Figure 3 It is a state diagram of the electrolyte buffering cup of the present application under negative pressure.
[0036] Figure 4 It is a state diagram of the electrolyte buffering cup of the present application when the negative pressure is broken.
[0037] As shown in the figure: 1, cup body; 2, impeller; 3, battery cell; 21, rotating shaft; 22, blade; 101, busbar connecting port; 102, battery cell connecting port; 103, airflow channel; 104, first flow guide part; 105, second flow guide part. DETAILED DESCRIPTION
[0038] The technical solutions in the utility model will be clearly and completely described below in combination with the specific embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.
[0039] As shown in the figure, Figures 1-4 The utility model discloses an electrolyte buffer cup, which comprises a cup body 1 and an impeller 2.
[0040] As shown in the figure, Figure 1 The cup body 1 is a transparent rectangular structure, and the top of the cup body 1 is provided with a busbar connecting port 101, and the bottom of the cup body 1 is provided with a battery cell connecting port 102. The busbar connecting port 101 is used for connecting a busbar. As shown in the figure, Figure 3 And Figure 4 The battery cell connecting port 102 is used for connecting the liquid injection hole of the battery cell 3.
[0041] As shown in the figure, Figure 1 The inside of the cup body 1 is vertically provided with a serpentine-shaped airflow channel 103, and the impeller 2 is arranged at the channel opening of the lower end of the airflow channel 103. The impeller 2 is rotatably arranged in the inside of the cup body 1, and the airflow channel 103 is used for guiding the flow of the gas and electrolyte mixture and separating the gas and electrolyte. As shown in the figure, Figure 1 The channel opening of the upper end of the airflow channel 103 is communicated with the busbar connecting port 101, and the channel opening of the lower end is communicated with the battery cell connecting port 102.
[0042] During formation, the gas and electrolyte mixture enters the cup body 1 from the battery cell connecting port 102, then passes through the serpentine-shaped airflow channel 103, the electrolyte adheres to the inner wall of the airflow channel 103, and the gas is discharged from the busbar connecting port 101, realizing gas-liquid separation. Influenced by the serpentine-shaped structure, when used under high negative pressure conditions, the flow path length of the airflow is increased, so as to prolong the residence time of the airflow in the buffer cup, increase the gas-liquid separation effect, make the loss of electrolyte small, and reduce the loss of electrolyte.
[0043] In the chemical conversion process, the airflow drives the impeller 2 to rotate, and the electrolyte in the airflow is blocked and attached by the rotating impeller 2, so that the electrolyte carried by the airflow entering the airflow passage 103 is less, the risk of electrolyte being extracted is reduced, and the loss of electrolyte is further reduced.
[0044] As shown in the structural design of the cup body 1, Figure 1 a plate-shaped first flow guide part 104 is arranged on the right side inside the cup body 1, and a plate-shaped second flow guide part 105 is arranged on the left side inside the cup body 1. As shown in Figure 4 , the second flow guide part 105 is horizontally arranged with the first flow guide part 104, in combination Figure 1 , the first flow guide part 104 is above the impeller 2, and the second flow guide part 105 is on the left side of the impeller 2. The first flow guide part 104 and the second flow guide part 105 are arranged upwardly spaced apart, and the plurality of second flow guide parts 105 and the plurality of first flow guide parts 104 are arranged upwardly staggered and left-right staggered. Through the structural design, the airflow passage 103 is formed between the second flow guide part 105 and the first flow guide part 104. In this structure, the airflow passage 103 is formed between the second flow guide part 105 and the first flow guide part 104. Through the staggered arrangement of the first flow guide part 104 and the second flow guide part 105, the flow resistance of the gas-liquid mixture is increased, the electrolyte is easily attached to the surface of the first flow guide part 104 and the second flow guide part 105, and the gas-liquid separation efficiency is further improved, reducing the risk of electrolyte being extracted.
[0045] Further, as shown in Figure 1 , the adjacent ends of the second flow guide part 105 and the first flow guide part 104 are bent downwardly to form an L shape, and the fluid resistance is further increased through this structure, so that the electrolyte is more easily attached to the surface of the first flow guide part 104 and the second flow guide part 105.
[0046] In addition, the bottom of the cup body 1 is funnel-shaped, and the battery connection port 102 is arranged at the lowest part of the funnel-shaped structure. Through this structure, the electrolyte flows to the battery connection port 102, which is beneficial to the backflow of the electrolyte.
[0047] In the structural design of the impeller 2, Figure 2 as shown, the impeller 2 is composed of a shaft 21 and eight blades 22, wherein the shaft 21 is horizontally arranged, and the two ends of the shaft 21 are rotatably connected to the side wall of the cup body 1 through bearings. Figure 4 In the structural design of the impeller 2, Figure 2 as shown, the impeller 2 is composed of a shaft 21 and eight blades 22, wherein the shaft 21 is horizontally arranged, and the two ends of the shaft 21 are rotatably connected to the side wall of the cup body 1 through bearings. Figure 1 In the structural design of the impeller 2, Figure 2 as shown, the impeller 2 is composed of a shaft 21 and eight blades 22, wherein the shaft 21 is horizontally arranged, and the two ends of the shaft 21 are rotatably connected to the side wall of the cup body 1 through bearings.
[0048] When the electrolyte is being formed, the airflow drives the blade 22 to rotate clockwise, in this state, the electrolyte attached to the blade 22 can be thrown into the airflow channel 103, which affects the gas-liquid separation effect of the airflow channel 103, in order to solve this problem, the end of the blade 22 away from the rotating shaft 21 is bent in the counterclockwise direction to form an L shape. Through the bending shape, the electrolyte on the blade 22 is constrained, so that the electrolyte is not easy to be thrown into the airflow channel 103. At the same time, as shown in Figure 4 , through the bending structure, the airflow resistance when breaking the negative pressure can be increased, so that the downward airflow can easily drive the impeller 2 to rotate.
[0049] After the formation is completed, as shown in Figure 4 , the downward airflow drives the impeller 2 to rotate counterclockwise, throws the electrolyte remaining on the blade 22 into the buffer cup, realizes the recovery of the electrolyte, and effectively reduces the loss of the electrolyte.
[0050] In addition, in order to make the second flow guide part 105 and the electrolyte on the first flow guide part 104 well separated, the adjacent ends of the second flow guide part 105 and the first flow guide part 104 are arranged to be inclined downward, as shown in Figure 1 , the inclination angle is 10°-20°, through the inclined structure, the electrolyte on the second flow guide part 105 and the first flow guide part 104 is blown by the downward airflow, so that the electrolyte falls into the electrolyte at the bottom of the buffer cup again.
[0051] The use method of the electrolyte buffer cup of the utility model is as follows:
[0052] First, as shown in Figure 3 , the electrolyte buffer cup is connected with the electrolyte injection hole of the battery cell 3, and the free electrolyte in the battery cell 3 is drawn into the buffer cup along the electrolyte connection port 102 when the negative pressure is drawn, and the gas generated during the formation is discharged along the upper bus bar connection port 101, and in the process, the electrolyte in the airflow is separated by being attached to the surface of the impeller 2 and the inner wall of the serpentine-shaped airflow channel 103.
[0053] After the formation is completed, as shown in Figure 4 , the downward airflow drives the impeller 2 to rotate counterclockwise, throws the electrolyte remaining on the blade 22 into the buffer cup, realizes the recovery of the electrolyte, and effectively reduces the loss of the electrolyte.
[0054] The above only describes the preferred embodiment of the utility model, and does not limit the utility model, any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.
Claims
1. An electrolyte storage cup, comprising a cup body (1), wherein, a busbar connecting port (101) is arranged at the top of the cup body (1), and a cell connecting port (102) is arranged at the bottom of the cup body (1); characterized in that it further comprises an impeller (2), wherein, a serpentine-shaped airflow channel (103) is arranged vertically inside the cup body (1), and the upper end of the airflow channel (103) is connected to the busbar connecting port (101), and the lower end of the airflow channel (103) is connected to the cell connecting port (102); the impeller (2) is arranged to rotate inside the cup body (1), and the impeller (2) is arranged at the channel port of the lower end of the airflow channel (103).
2. An electrolyte reservoir cup as claimed in claim 1, characterized in that: the impeller (2) comprises a rotating shaft (21) and a blade (22), wherein, the rotating shaft (21) is arranged horizontally, and both ends of the rotating shaft (21) are rotatably connected to the side wall of the cup body (1); a plurality of blades (22) are arranged in a circumferential annular array along the rotating shaft (21), and the blades (22) are fixedly connected to the rotating shaft (21).
3. An electrolyte reservoir cup as claimed in claim 2, wherein: the blade (22) is bent in an L shape in the counterclockwise direction away from one end of the rotating shaft (21).
4. An electrolyte reservoir cup as claimed in claim 3, characterized in that: the blade (22) is arranged vertically on the side of the rotating shaft (21).
5. An electrolyte reservoir cup as claimed in claim 3, characterized in that: the blade (22) is arranged in an inclined manner in the counterclockwise direction.
6. An electrolyte reservoir cup as defined in claim 1, wherein: a plate-shaped first flow guide (104) is arranged on the right side inside the cup body (1), and a plate-shaped second flow guide (105) is arranged on the left side inside the cup body (1), wherein, the first flow guide (104) is arranged above the impeller (2), and the second flow guide (105) is arranged to the left of the impeller (2); the first flow guide (104) and the second flow guide (105) are arranged upwardly in several intervals; several second flow guides (105) and several first flow guides (104) are arranged alternately in the up-down direction and the left-right direction; the airflow channel (103) is formed between the second flow guide (105) and the first flow guide (104).
7. An electrolyte reservoir cup as claimed in claim 6, characterized in that: the adjacent ends of the second flow guide (105) and the first flow guide (104) are bent downwardly in an L shape.
8. An electrolyte reservoir cup as claimed in claim 7, characterized in that: the second flow guide (105) and the first flow guide (104) are arranged horizontally.
9. An electrolyte reservoir cup as claimed in claim 7, characterized in that: the adjacent ends of the second flow guide (105) and the first flow guide (104) are arranged downwardly in an inclined manner.
10. An electrolyte reservoir cup as defined in claim 1, wherein: the bottom of the cup body (1) is funnel-shaped.