An integrated formation and circulation type liquid injection device and method for an aluminum shell battery

Abstract

The application relates to an integrated formation cycle type liquid injection device and method of an aluminum shell battery, which comprises an aluminum shell battery, a liquid injection port, a liquid injection cup, a buffer bag, a vacuum port, a positive electrode and a negative electrode; the liquid injection port and the vacuum port are installed on the aluminum shell battery; the aluminum shell battery is connected with the liquid injection cup through the liquid injection port; the vacuum port is connected with the liquid injection cup through the buffer bag; and the positive electrode and the negative electrode are installed on the aluminum shell battery. The application reduces the thickness of the battery, simplifies the process and shortens the cycle.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing technology, specifically to an integrated aluminum-cased battery formation and circulating electrolyte injection device and method. Background Technology

[0002] Aluminum-cased batteries, especially LiFeO4-based aluminum-cased cells, require increased positive and negative electrode compaction density to improve specific energy. Because the deformable space of the aluminum casing is almost nonexistent, the electrolyte must be soaked before formation, resulting in a long shelf life. The existing electrolyte injection formation process mainly involves first injection, shelf life, formation, and second injection. Transferring aluminum-cased batteries between different processes requires inserting and removing formation pins, posing a risk of contamination. Furthermore, the second injection stage can easily cause irreversible bulging of the cells. Summary of the Invention

[0003] The purpose of this invention is to provide an integrated aluminum-cased battery formation and circulating liquid injection device and method to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an integrated aluminum-cased battery formation and circulating liquid injection device, comprising: an aluminum-cased battery, a liquid injection port, a liquid injection cup, a buffer bladder, a vacuum port, a positive electrode, and a negative electrode; the liquid injection port and the vacuum port are mounted on the aluminum-cased battery, the aluminum-cased battery is connected to the liquid injection cup through the liquid injection port, the vacuum port is connected to the liquid injection cup through the buffer bladder, and the positive electrode and the negative electrode are mounted on the aluminum-cased battery.

[0005] A method for integrated formation and circulating electrolyte injection of aluminum-cased batteries, comprising the following steps: S1. Place the aluminum-cased battery to be injected into the formation tray, connect the vacuum pump to the vacuum port reserved on the top cover of the aluminum-cased battery, connect the injection cup to the injection port reserved on the top cover of the aluminum-cased battery, and connect the positive and negative electrodes to the positive and negative electrodes of the aluminum-cased battery. S2. Evacuate the inside of the aluminum-cased battery to maintain a negative pressure of -10kPa to -40kPa inside the aluminum-cased battery; S3. Electrolyte A flows into the aluminum-cased battery from the injection cup. Electrolyte extracted by vacuuming flows into the injection cup through the buffer bladder, forming a cycle. S4. When electrolyte A in the injection cup is emptied, the formation stage begins; S5. In the first stage of formation, the charging current is 0.01CA~0.2CA. When the cumulative charge is 10%~30%, the internal negative pressure of the aluminum-cased battery is -50kPa~-90kPa. S6. In the second stage of formation, the charging current is 0.1CA~0.5CA. When the cumulative charge is 30%~80%, the internal negative pressure of the aluminum-cased battery is -30kPa~-70kPa. S7. At the start of the second stage of formation, electrolyte B is injected into the injection cup. Electrolyte B flows from the injection cup into the aluminum-cased battery. The electrolyte brought out by the vacuum pump flows into the injection cup through the vacuum tube. S8. Formation complete, injection finished.

[0006] Compared with the prior art, the beneficial effects achieved by the present invention are: 1. This invention achieves vacuum liquid injection by connecting the aluminum-cased battery, the liquid injection port, the liquid injection cup, the buffer bladder, and the vacuum port in series, which effectively avoids the generation of air bubbles inside the aluminum casing. The buffer bladder can effectively prevent liquid overflow. 2. The continuous negative pressure circulation injection of electrolyte A in this invention can shorten the electrolyte wetting time; 3. In this invention, electrolyte B is injected under negative pressure during the later stages of formation, which can avoid the battery becoming too thick due to double injection, reduce the battery thickness, simplify the process, and shorten the cycle. 4. This invention adopts an integrated circulating injection system, which eliminates the need for transfer throughout the entire process, reduces the number of insertions and removals of the forming pins, simplifies the process, and reduces the risk of contamination. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a line graph showing the internal resistance during the process of this invention; Figure 1 In the middle: 1-aluminum shell battery, 2-liquid filling port, 3-liquid filling cup, 4-buffer bladder, 5-vacuum port, 6-positive electrode, 7-negative electrode. Implementation

[0008] To provide a more detailed understanding of the features and technical content of this invention, the implementation of this invention will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference only and are not intended to limit this invention.

[0009] Reference Figure 1 An integrated formation and circulating liquid injection device for an aluminum-cased battery includes: an aluminum-cased battery 1, a liquid injection port 2, a liquid injection cup 3, a buffer bladder 4, a vacuum port 5, a positive electrode 6, and a negative electrode 7; the liquid injection port 2 and the vacuum port 5 are installed on the aluminum-cased battery 1, the aluminum-cased battery 1 is connected to the liquid injection cup 3 through the liquid injection port 2, the vacuum port 5 is connected to the liquid injection cup 3 through the buffer bladder 4, and the positive electrode 6 and the negative electrode 7 are installed on the aluminum-cased battery 1.

[0010] Example

[0011] According to the present invention, an integrated formation and circulating electrolyte injection method for aluminum-cased batteries comprises the following specific steps: S1. Place the aluminum-cased battery 1 to be injected into the formation tray, connect the vacuum pump to the vacuum port 5 reserved on the top cover of the aluminum-cased battery 1, connect the injection cup 3 to the injection port 2 reserved on the top cover of the aluminum-cased battery 1, and connect the positive and negative electrodes to the positive electrode 6 and negative electrode 7 on the aluminum-cased battery 1. S2. Vacuum the inside of aluminum-cased battery 1 to maintain a negative pressure of -10kPa inside aluminum-cased battery 1; S3. Electrolyte 1 flows into the aluminum-cased battery 1 from the injection cup 3. Electrolyte extracted by vacuuming flows into the injection cup 3 through the buffer bladder 4, forming a cycle. S4. When electrolyte 1 in injection cup 3 is emptied, the formation stage begins; S5. Formation stage 1, charging current 0.01CA, cumulative charge 10%, internal negative pressure of aluminum-cased battery 1 -50kPa; S6. In the second stage of formation, the charging current is 0.1CA. When the cumulative charge is 30%, the internal negative pressure of aluminum-cased battery 1 is -30kPa. S7. When the second stage of formation begins, electrolyte 2 is injected into the injection cup 3. Electrolyte 2 flows into the aluminum-cased battery 1 from the injection cup 3. Electrolyte brought out by the vacuum pump flows into the injection cup 3 through the vacuum tube. S8. Formation complete, injection finished.

[0012] Example

[0013] According to the present invention, an integrated formation and circulating electrolyte injection method for aluminum-cased batteries comprises the following specific steps: S1. Place the aluminum-cased battery 1 to be injected into the formation tray, connect the vacuum pump to the vacuum port 5 reserved on the top cover of the aluminum-cased battery 1, connect the injection cup 3 to the injection port 2 reserved on the top cover of the aluminum-cased battery 1, and connect the positive and negative electrodes to the positive electrode 6 and negative electrode 7 on the aluminum-cased battery 1. S2. Vacuum the inside of aluminum-cased battery 1 to maintain a negative pressure of -30kPa inside aluminum-cased battery 1; S3. Electrolyte 1 flows into the aluminum-cased battery 1 from the injection cup 3. Electrolyte extracted by vacuuming flows into the injection cup 3 through the buffer bladder 4, forming a cycle. S4. When electrolyte 1 in injection cup 3 is emptied, the formation stage begins; S5. Formation stage 1, charging current 0.02CA, cumulative charge 15%, internal negative pressure of aluminum-cased battery 1 -80kPa; S6. In the second stage of formation, the charging current is 0.2CA. When the cumulative charge is 40%, the internal negative pressure of aluminum-cased battery 1 is -70kPa. S7. When the second stage of formation begins, electrolyte 2 is injected into the injection cup 3. Electrolyte 2 flows into the aluminum-cased battery 1 from the injection cup 3. Electrolyte brought out by the vacuum pump flows into the injection cup 3 through the vacuum tube. S8. Formation complete, injection finished.

[0014] Example

[0015] like Figure 1 As shown, the specific steps of the integrated formation and circulating electrolyte injection method for an aluminum-cased battery 1 provided by the present invention are as follows: S1. Place the aluminum-cased battery 1 to be injected into the formation tray, connect the vacuum pump to the vacuum port 5 reserved on the top cover of the aluminum-cased battery 1, connect the injection cup 3 to the injection port 2 reserved on the top cover of the aluminum-cased battery 1, and connect the positive and negative electrodes to the positive electrode 6 and negative electrode 7 on the aluminum-cased battery 1. S2. Vacuum the inside of aluminum-cased battery 1 to maintain a negative pressure of -40kPa inside aluminum-cased battery 1; S3. Electrolyte 1 flows into the aluminum-cased battery 1 from the injection cup 3. Electrolyte extracted by vacuuming flows into the injection cup 3 through the buffer bladder 4, forming a cycle. S4. When electrolyte 1 in injection cup 3 is emptied, the formation stage begins; S5. Formation stage 1, charging current 0.2CA, cumulative charge 30%, internal negative pressure of aluminum-cased battery 1 -90kPa; S6. In the second stage of formation, the charging current is 0.5CA. When the cumulative charge is 80%, the internal negative pressure of aluminum-cased battery 1 is -70kPa. S7. When the second stage of formation begins, electrolyte 2 is injected into the injection cup 3. Electrolyte 2 flows into the aluminum-cased battery 1 from the injection cup 3. Electrolyte brought out by the vacuum pump flows into the injection cup 3 through the vacuum tube. S8. Formation complete, injection finished.

[0016]

[0017] As can be seen from the data in the table, the production cycle and thickness are significantly reduced by using the method of the present invention compared with the traditional process.

[0018] from Figure 2 It can be seen that, compared with the traditional process, the method of the present invention reduces the internal resistance more quickly, the electrolyte wetting rate is fast and the effect is good, which is beneficial to reducing the electrode impedance.

[0019] This invention achieves vacuum injection by connecting the aluminum-cased battery 1, injection port 2, injection cup 3, buffer bladder 4, and vacuum port 5 in series, effectively preventing air bubbles from forming inside the aluminum casing. The buffer bladder 4 effectively prevents injection overflow. The continuous negative pressure circulation injection of electrolyte A shortens the electrolyte wetting time. Negative pressure circulation injection of electrolyte B during the later stages of formation avoids excessive battery thickness due to double injection, reducing battery thickness and simplifying the process while shortening the cycle. This invention employs an integrated formation circulation injection system, eliminating the need for transfer throughout the process, reducing the number of times formation pins are inserted and removed, simplifying the process, and lowering the risk of contamination.

[0020] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An integrated formation cycle type liquid injection device for an aluminum can battery, characterized by include: An aluminum-cased battery (1), an injection port (2), an injection cup (3), a buffer bladder (4), a vacuum port (5), a positive electrode (6), and a negative electrode (7); the injection port (2) and the vacuum port (5) are installed on the aluminum-cased battery (1), the aluminum-cased battery (1) is connected to the injection cup (3) through the injection port (2), the vacuum port (5) is connected to the injection cup (3) through the buffer bladder (4), and the positive electrode (6) and the negative electrode (7) are installed on the aluminum-cased battery (1).

2. A method for integrated formation and circulating electrolyte injection of an aluminum-cased battery, characterized in that: The steps are as follows: S1. Place the aluminum-cased battery (1) to be injected into the formation tray, connect the vacuum pump to the vacuum port (5) reserved on the top cover of the aluminum-cased battery (1), connect the injection cup (3) to the injection port (2) reserved on the top cover of the aluminum-cased battery (1), and connect the positive and negative electrodes to the positive electrode (6) and negative electrode (7) on the aluminum-cased battery (1). S2. Vacuum the inside of the aluminum-cased battery (1) to maintain a negative pressure of -10kPa to -40kPa inside the aluminum-cased battery (1); S3. Electrolyte A flows into the aluminum-cased battery (1) through the injection cup (3). The electrolyte extracted by vacuuming flows into the injection cup (3) through the buffer bag (4) to form a cycle. S4. When electrolyte A in injection cup (3) is emptied, the formation stage begins; S5. In the first stage of formation, the charging current is 0.01CA~0.2CA. When the cumulative charge is 10%~30%, the internal negative pressure of the aluminum shell battery (1) is -50kPa~-90kPa. S6. In the second stage of formation, the charging current is 0.1CA~0.5CA. When the cumulative charge is 30%~80%, the internal negative pressure of the aluminum shell battery (1) is -30kPa~-70kPa. S7. At the beginning of the second stage of formation, electrolyte B is injected into the injection cup (3). Electrolyte B flows from the injection cup (3) into the aluminum shell battery (1). The electrolyte brought out by the vacuum pump flows into the injection cup (3) through the vacuum tube. S8. Formation complete, injection finished.

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