Battery formation device and battery production line
By adopting a combination structure of main pipe and sub-pipes in the battery formation device, and utilizing designs such as annular sub-pipes and through pipes, the problem of electrolyte volume difference caused by uneven negative pressure pipes was solved, achieving a balance of electrolyte volume during battery formation and improving the cell quality stability of the battery production line.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- QINGTAO (KUNSHAN) ENERGY DEV CO LTD
- Filing Date
- 2025-05-23
- Publication Date
- 2026-05-12
AI Technical Summary
In the existing aluminum-cased lithium-ion battery formation process, the uneven design of the negative pressure pipeline leads to large differences in the amount of electrolyte extracted from each cell. As a result, the amount of electrolyte in the cell is uneven after formation, and it is easy to over- or under-fill during the electrolyte replenishment process.
采用主管道与分管道和支管道的组合结构，分管道设计为环状通道，增加贯通管和延长管以均衡负压，通过环状分管道对气体进行匀压，确保每个支管道内的负压一致，进而使每个电芯吸出电解液量一致。
This achieves a balance in the amount of electrolyte in each cell, ensuring consistent electrolyte levels after formation, avoiding uneven replenishment and overfilling, and improving the overall quality stability of the battery production line.
Smart Images
Figure CN224232680U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to a battery formation device and a battery production line. Background Technology
[0002] Aluminum-cased lithium-ion batteries boast advantages such as large capacity, long cycle life, and high safety and reliability, making them highly influential in large-scale energy storage and additional storage applications. In the production process of aluminum-cased batteries, the formation process plays a crucial role in the final battery performance. The formation process involves charging the battery with a small current under negative pressure, causing a stable and dense SEI film to form at the electrode interface. Simultaneously, gases generated by the reaction between the electrolyte and the electrodes are removed, resulting in a lithium battery with acceptable dimensions and stable performance. The market demands high low-temperature rate performance and long cycle life for batteries, typically employing a larger electrolyte injection coefficient to meet these performance requirements. However, with increased electrolyte injection volume, a significant amount of free electrolyte is easily drawn into the negative pressure pipeline during formation.
[0003] In existing chemical formation processes, such as Figure 1 As shown, most negative pressure pipelines are designed as straight pipes 1', drawing air from one end. Multiple branch pipes 2' are connected to the straight pipe 1' sequentially along its extension direction. The negative pressure effect is better near the negative pressure device and worse away from it. This results in more electrolyte being drawn into the straight pipe 1' from the cell 3' near the negative pressure device and less from the cell 3' far from the negative pressure device. After formation, the amount of electrolyte lost by each cell 3' varies greatly. The subsequent electrolyte replenishment device generally replenishes a fixed amount, resulting in different amounts of electrolyte in the cells 3' after replenishment, or even an excess of electrolyte after replenishment.
[0004] Therefore, there is an urgent need to design a battery formation device and a battery production line to solve the above problems. Utility Model Content
[0005] One objective of this invention is to provide a battery formation device that can improve the uniformity of negative pressure on each cell, thereby ensuring that the amount of electrolyte in each cell is average.
[0006] Another objective of this invention is to provide a battery production line in which the amount of electrolyte in each cell tends to be more uniform by using the aforementioned battery formation apparatus.
[0007] To achieve this objective, the present invention adopts the following technical solution:
[0008] Battery formation apparatus, including:
[0009] The main pipeline and the branch pipelines, the first end of the main pipeline is connected to the negative pressure device, at least part of the branch pipelines are constructed as annular channels, and the second end of the main pipeline is connected to the branch pipelines.
[0010] Multiple branch pipes are provided on the aforementioned sub-pipes, and the first end of each branch pipe is connected to the aforementioned sub-pipes. The first ends of the multiple branch pipes are spaced apart on the aforementioned sub-pipes, and the second end of each branch pipe is used to connect to the battery cell.
[0011] As an optional solution, the above-mentioned sub-pipelines include:
[0012] A ring pipe, wherein the ring pipe is connected to the second end of the main pipe and to the first end of the plurality of branch pipes;
[0013] At least one through pipe, the two ends of which are respectively connected to two positions of the annular pipe.
[0014] As an alternative, the second end of the main pipe is connected to the annular pipe at the first position, the first end of the through pipe is connected to the annular pipe at the second position, the second end of the through pipe is connected to the annular pipe at the third position, and the branch pipe is connected to the annular pipe at the fourth position; wherein the first position, the second position, the third position, and the fourth position are not collinear.
[0015] As an alternative, one or more of the aforementioned through pipes are provided, and the length of the aforementioned annular pipe is divided equally by one or more of the aforementioned through pipes.
[0016] As an alternative, the aforementioned branch pipe also includes two extension pipes, which are connected to the aforementioned annular pipe, and one or more of the aforementioned branch pipes are provided on the extension pipes.
[0017] As an alternative, the two extension tubes mentioned above are of equal length and are arranged symmetrically relative to the aforementioned annular tube.
[0018] As an alternative, multiple of the aforementioned branch pipes are arranged symmetrically relative to the aforementioned annular pipe.
[0019] As an optional solution, a liquid storage tank is provided between each of the above-mentioned branch pipes and the corresponding battery cell.
[0020] As an alternative, a negative pressure suction nozzle is provided at the end of the liquid storage tank away from the branch pipe, and the negative pressure suction nozzle is connected to the liquid injection port of the corresponding battery cell.
[0021] A battery production line, including the aforementioned battery formation equipment.
[0022] The beneficial effects of this utility model are as follows:
[0023] This invention provides a battery formation device in which the main pipe is not directly connected to multiple branch pipes, but a branch pipe is added between the multiple branch pipes and the main pipe. The annular branch pipe plays a role in equalizing the gas pressure. Compared with the main pipe being directly connected to the branch pipes, the negative pressure in the branch pipe is stable, and the negative pressure in each branch pipe tends to be consistent, so that the amount of electrolyte absorbed by each cell tends to be consistent, thereby ensuring that the amount of electrolyte in the cell tends to be consistent after replenishment.
[0024] This invention also provides a battery production line, including the aforementioned battery formation apparatus. By employing the aforementioned battery formation apparatus, this battery production line can ensure that the amount of electrolyte in each battery cell tends to be uniform. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of the structure of a battery formation device provided by existing technology;
[0026] Figure 2 This is a schematic diagram of the battery formation apparatus provided in an embodiment of the present invention;
[0027] Figure 3 This is a schematic diagram of the structure of a battery formation apparatus provided in another embodiment of the present invention;
[0028] Figure 4 This is a schematic diagram of the battery formation apparatus provided in another embodiment of the present invention.
[0029] In the picture:
[0030] 1' Straight pipe; 2' Branch pipe; 3' Battery cell;
[0031] 1. Main pipe; 2. Branch pipe; 21. Ring pipe; 22. Through pipe; 23. Extension pipe; 3. Branch pipe; 4. Storage tank; 5. Battery cell; 6. Injection port; 7. Negative pressure nozzle. Detailed Implementation
[0032] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.
[0033] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0035] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.
[0036] This embodiment provides a battery formation apparatus that can improve the uniformity of negative pressure applied to each cell 5, thereby ensuring an average amount of electrolyte in each cell 5. Figure 2 As shown, the battery formation device includes a main pipe 1, a branch pipe 2, and multiple branch pipes 3. The first end of the main pipe 1 is connected to a negative pressure device. At least part of the branch pipe 2 is constructed as a ring channel. The second end of the main pipe 1 is connected to the branch pipe 2. Multiple branch pipes 3 are disposed on the branch pipe 2, and the first end of the branch pipe 3 is connected to the branch pipe 2. The first ends of the multiple branch pipes 3 are spaced apart on the branch pipe 2. The second end of the branch pipe 3 is used to connect to the battery cell 5.
[0037] In the aforementioned battery formation device, the main pipe 1 is not directly connected to multiple branch pipes 3. Instead, a branch pipe 2 is added between the multiple branch pipes 3 and the main pipe 1. The annular branch pipe 2 plays a role in equalizing the gas pressure. Compared with the main pipe 1 being directly connected to the branch pipes 3, the negative pressure in the branch pipe 2 is stable, and the negative pressure in each branch pipe 3 tends to be consistent, so that the amount of electrolyte absorbed by each cell 5 tends to be consistent, thereby ensuring that the amount of electrolyte in the cell 5 tends to be consistent after replenishment.
[0038] Optionally, such as Figure 2 As shown, the branch pipe 2 includes an annular pipe 21 and at least one through pipe 22. The annular pipe 21 is connected to the second end of the main pipe 1 and to the first end of multiple branch pipes 3. The two ends of the through pipe 22 are respectively connected to two positions of the annular pipe 21. Through the above arrangement, the through pipe 22 effectively increases the airflow path, thereby improving the pressure uniformity of the branch pipe 2. In this embodiment, one through pipe 22 is provided. In other embodiments, the number of through pipes 22 can be two, three, or four, which is not limited here.
[0039] Optionally, such as Figure 4 As shown, the second end of the main pipe 1 is connected to the annular pipe 21 at the first position, the first end of the through pipe 22 is connected to the annular pipe 21 at the second position, the second end of the through pipe 22 is connected to the annular pipe 21 at the third position, and the branch pipe 3 is connected to the annular pipe 21 at the fourth position; wherein the first, second, third, and fourth positions are not collinear. This arrangement prevents excessive evaporation of the electrolyte from a particular battery.
[0040] Optionally, such as Figure 2 As shown, one or more through pipes 22 are provided, and the length of the annular pipe 21 is equally divided by the through pipes 22. Thus, the negative pressure is symmetrically arranged in the branch pipes 2, which helps to improve the balance of negative pressure.
[0041] Low options are available, such as Figure 2 As shown, the branch pipe 2 also includes two extension pipes 23, one end of which is connected to the annular pipe 21, and one or more branch pipes 3 are provided on the extension pipe 23. With the above arrangement, when there are too many battery cells 5, more branch pipes 3 and more battery cells 5 can be matched by setting the extension pipes 23.
[0042] Optionally, the two extension pipes 23 are of equal length and arranged symmetrically relative to the annular pipe 21. This makes the branch pipes 2 symmetrically arranged, which helps to improve the balance of negative pressure.
[0043] Optionally, multiple branch pipes 3 are arranged symmetrically relative to the annular pipe 21 to further improve the balance of negative pressure.
[0044] In another embodiment, the other end of the extension tube 23 is closed, and the sidewall of each extension tube 23 is connected to at least one branch tube 3. No limitation is made here.
[0045] In this embodiment, as Figure 2 As shown, there are three battery cells 5, with one in the middle and the other end cells 5 connected to the ends of the corresponding extension tubes 23. In an optional embodiment, as... Figure 3 As shown, there are five cells 5. Figure 2 and Figure 3 In both embodiments, each extension pipe 23 is connected to a branch pipe 3. In another optional embodiment, such as Figure 4 As shown, there are twelve battery cells 5, and each extension tube 23 is connected to three branch pipes 3. Of course, as the number of battery cells 5 increases, the number of branch pipes 3 connected to each extension tube 23 also increases accordingly, so as to ensure that the spacing between adjacent battery cells 5 is average.
[0046] Optionally, such as Figure 2 As shown, a storage tank 4 is installed between each branch pipe 3 and the corresponding battery cell 5. Since the storage tank 4 has a large volume, when only a small amount of electrolyte is drawn out, the electrolyte enters the storage tank 4. After the negative pressure disappears, the electrolyte in the storage tank 4 can flow back into the battery cell 5, thereby reducing the loss of electrolyte during the formation process.
[0047] Optionally, such as Figure 2 As shown, a negative pressure suction nozzle 7 is provided at the end of the liquid storage tank 4 away from the branch pipe 3, and the negative pressure suction nozzle 7 is connected to the liquid injection port 6 of the corresponding battery cell 5. By providing the negative pressure suction nozzle 7, the liquid storage tank 4 and the battery cell 5 can be quickly and easily connected.
[0048] This embodiment also provides a battery production line, including the aforementioned battery formation apparatus. By employing the aforementioned battery formation apparatus, this battery production line can ensure that the amount of electrolyte in each cell 5 tends to be uniform.
[0049] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A battery formation apparatus, characterized in that, include: A main pipe (1) and a branch pipe (2), wherein the first end of the main pipe (1) is connected to a negative pressure device, at least part of the branch pipe (2) is constructed as a ring channel, and the second end of the main pipe (1) is connected to the branch pipe (2); Multiple branch pipes (3) are provided on the sub-pipe (2), and the first end of the branch pipe (3) is connected to the sub-pipe (2). The first ends of the multiple branch pipes (3) are spaced apart on the sub-pipe (2), and the second end of the branch pipe (3) is used to connect to the battery cell (5).
2. The battery formation apparatus according to claim 1, characterized in that, The branch pipe (2) includes: A ring pipe (21) is connected to the second end of the main pipe (1) and to the first end of the plurality of branch pipes (3); At least one through pipe (22), the two ends of which are respectively connected to two positions of the annular pipe (21).
3. The battery formation apparatus according to claim 2, characterized in that, The second end of the main pipe (1) is connected to the annular pipe (21) at a first position, the first end of the through pipe (22) is connected to the annular pipe (21) at a second position, the second end of the through pipe (22) is connected to the annular pipe (21) at a third position, and the branch pipe (3) is connected to the annular pipe (21) at a fourth position; wherein the first position, the second position, the third position, and the fourth position are not collinear.
4. The battery formation apparatus according to claim 2, characterized in that, One or more of the through pipes (22) are provided, and one or more of the through pipes (22) divide the length of the annular pipe (21) equally.
5. The battery formation apparatus according to claim 2, characterized in that, The branch pipe (2) also includes two extension pipes (23), which are connected to the annular pipe (21), and one or more of the branch pipes (3) are provided on the extension pipes (23).
6. The battery formation apparatus according to claim 5, characterized in that, The two extension tubes (23) are of equal length and are arranged symmetrically relative to the annular tube (21).
7. The battery formation apparatus according to any one of claims 2-6, characterized in that, The multiple branch pipes (3) are arranged symmetrically relative to the annular pipe (21).
8. The battery formation apparatus according to any one of claims 1-6, characterized in that, A liquid storage tank (4) is provided between each of the branch pipes (3) and the corresponding battery cell (5).
9. The battery formation apparatus according to claim 8, characterized in that, The storage tank (4) is provided with a negative pressure suction nozzle (7) at one end away from the branch pipe (3), and the negative pressure suction nozzle (7) is connected to the liquid injection port (6) of the corresponding battery cell (5).
10. A battery production line, characterized in that, Includes the battery formation apparatus as described in any one of claims 1-9.