Electrolyte infusion device
By using multiple filter elements and large-diameter pipelines in the electrolyte filling device, the problem of insufficient filling speed for large-capacity lithium batteries is solved, achieving efficient electrolyte filtration and filling, and reducing the space and cost of the device.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- KAIBO ENERGY TECH (CHENGDU) CO LTD
- Filing Date
- 2025-07-16
- Publication Date
- 2026-07-14
AI Technical Summary
Existing electrolyte filling devices cannot meet the filling speed requirements of large-capacity lithium batteries, and their low filtration efficiency limits the electrolyte filling efficiency.
The filtration structure employs multiple filter elements to increase the filtration area, and uses large-diameter pipelines to connect the storage tank and the injection pump structure, thereby improving filtration and diversion efficiency, reducing the number of storage tanks, and lowering the device space and cost.
It improves the filtration speed and filling efficiency of the electrolyte, avoids electrolyte flow interruption, meets the filling speed requirements of lithium batteries, and reduces the structural layout space and cost of the device.
Smart Images
Figure CN224502299U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery manufacturing technology, and in particular to an electrolyte filling device. Background Technology
[0002] The electrolyte in a lithium-ion battery is the carrier for ion transport within the battery. It is generally composed of lithium salts and organic solvents. The electrolyte salt acts as a conductor of ions between the positive and negative electrodes of a lithium-ion battery, ensuring the high voltage and high specific energy of the battery.
[0003] As the capacity of lithium batteries increases, the amount of electrolyte that needs to be injected also increases. However, current electrolyte injection devices filter a fixed amount of electrolyte, which cannot meet the injection speed requirements of lithium batteries.
[0004] Therefore, there is an urgent need for an electrolyte injection device to solve the above-mentioned technical problems. Utility Model Content
[0005] The purpose of this invention is to provide an electrolyte filling device that can improve the filtration efficiency of the electrolyte and meet the filling speed requirements of lithium batteries.
[0006] To achieve this objective, the present invention adopts the following technical solution:
[0007] An electrolyte filling device is provided, comprising:
[0008] A filtration structure for filtering electrolyte, the filtration structure comprising a housing and at least two filter elements, the filter elements being installed inside the housing, the total filtration area of the filter elements being S1, and the area of the inner peripheral wall of the housing being S2, wherein S1:S2>1;
[0009] A storage tank, connected to the filtration structure via a first pipeline, is used to store the filtered electrolyte.
[0010] The liquid injection pump structure is connected to the storage tank via a second pipeline. The liquid injection pump structure provides power to the electrolyte in the storage tank. The inner diameter of the second pipeline is R1, where R1 ≥ 16 mm.
[0011] This utility model has at least the following beneficial effects:
[0012] The electrolyte filling device provided by this utility model has a filter structure including at least two filter elements, with a total filter area of S1 and a circumferential surface area of the inner wall of the shell of S2, where S1:S2>1. This configuration increases the overall filter area of the filter structure, thereby improving the electrolyte filtration speed and preventing electrolyte flow interruption during battery filling, meeting the filling speed requirements of lithium batteries and greatly improving filling efficiency. Furthermore, the inner diameter of the second pipeline is greater than or equal to 16mm. Compared to the small-diameter pipelines in the prior art, this utility model, due to the filter structure, provides excellent filtration and defoaming effects on the electrolyte. This allows for the use of a second pipeline with an increased inner diameter for flow guidance. This increases the inlet speed, and the electrolyte flowing from the filter structure into the storage tank can be quickly guided by the injection pump structure through the second pipeline, preventing excessive retention in the storage tank. This reduces the need for at least one storage tank, lowering the structural layout space and cost of the electrolyte filling device. Attached Figure Description
[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.
[0014] Figure 1 A schematic diagram of the first structure of the electrolyte filling device provided in this embodiment of the utility model;
[0015] Figure 2 This is a second structural schematic diagram of the electrolyte filling device provided in an embodiment of the present invention;
[0016] Figure 3 A front view of the filter structure provided in an embodiment of this utility model;
[0017] Figure 4 for Figure 3 Sectional view at point AA;
[0018] Figure 5 A cross-sectional view of the first type of filter element provided in the embodiment of this utility model within the housing;
[0019] Figure 6 A cross-sectional view of the second type of filter element provided in this embodiment of the present invention within the housing;
[0020] Figure 7 This is a cross-sectional view of the third type of filter element provided in the embodiment of the present utility model inside the housing.
[0021] In the picture:
[0022] 1. Filter structure; 11. Shell; 111. Shell body; 112. Cover; 12. Filter element; 121. Arc-shaped sidewall; 122. Straight sidewall; 13. Electrolyte inlet pipe; 2. Storage tank; 3. Liquid injection pump structure; 4. Defoaming structure; 5. First pipeline; 6. Second pipeline; 7. Third pipeline. Detailed Implementation
[0023] 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.
[0024] 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.
[0025] 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.
[0026] In the description of this embodiment, the terms "upper," "lower," "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.
[0027] Currently, the production line requirements for energy storage products are becoming increasingly stringent, and production efficiency is developing towards greater efficiency requirements and larger battery cell volume. In related technologies, the liquid injection volume of a single battery in energy storage products is 1kg+, the time to remove air bubbles is 40s to 160s, and the liquid flow time is about 100s to 180s. At present, the liquid supply technology can only match 14PPM.
[0028] If the debubbling time is calculated as 60 seconds and the liquid flow time as 120 seconds, a single replenishment requires 3 minutes, with a total electrolyte volume of 42L. The volume of the filter structure and the total capacity of the storage tank are 100L. However, the increased liquid injection volume of large energy storage products will limit the filling efficiency.
[0029] An embodiment of this utility model provides an electrolyte filling device that can improve the filtration efficiency of the electrolyte and meet the filling speed requirements of lithium batteries.
[0030] like Figures 1 to 7 As shown, the electrolyte filling device includes a filter structure 1, a storage tank 2, and a filling pump structure 3. The filter structure 1 is used to filter the electrolyte. The filter structure 1 includes a housing 11 and at least two filter elements 12. The filter elements 12 are installed inside the housing 11. The total filtration area of the filter elements 12 is S1, and the area of the inner peripheral wall of the housing 11 is S2, where S1:S2>1. The storage tank 2 is connected to the filter structure 1 through a first pipeline 5 and is used to store the filtered electrolyte. The filling pump structure 3 is connected to the storage tank 2 through a second pipeline 6. The filling pump structure 3 provides power to the electrolyte in the storage tank 2. The inner diameter of the second pipeline 6 is R1, where R1≥16mm.
[0031] The electrolyte filling device provided by this utility model includes a filter structure 1 comprising at least two filter elements 12, with a total filtration area of S1 for the filter elements 12 and a circumferential surface area of S2 for the inner wall of the housing 11, wherein S1:S2>1. This configuration increases the overall filtration area of the filter structure 1, thereby improving the electrolyte filtration speed and preventing electrolyte flow interruption during electrolyte filling, thus meeting the filling speed requirements of lithium batteries and significantly improving filling efficiency. Furthermore, the inner diameter of the second pipeline 6 is greater than or equal to 16mm, for example, 16mm, 20mm, 25mm, 30mm, 35mm, or any value greater than or equal to 16mm. Compared to the small-diameter pipes in the prior art, the present invention, due to the setting of the filter structure 1, has a good filtering and defoaming effect on the electrolyte. Therefore, the second pipe 6 with an increased inner diameter can be used for diversion. In this way, while increasing the liquid inlet speed, the electrolyte flowing out of the filter structure 1 can be quickly diverted by the injection pump structure 3 through the second pipe 6 after entering the storage tank 2, without staying too much in the storage tank 2. This helps to reduce the need for at least one storage tank 2, and reduce the structural layout space and cost of the electrolyte filling device.
[0032] It should be noted that the total filtration area of filter element 12 refers to the total filtration area of all filter elements 12, while the filtration area of each filter element 12 refers to its circumferential surface area. The inner diameter of the second pipe 6 refers to the inner diameter of the second pipe 6.
[0033] It should be noted that, as Figure 2 As shown, the number of filter structures 1 can be two or more, meaning the number of filter structures 1 is not limited to one. In some embodiments, the number of filter structures 1 can be two, and in other embodiments, the number of filter structures 1 can be three, four, or more. Typically, the number of storage tanks 2 can be two or more. However, since the inner diameter of the second pipeline 6 is greater than 16mm, compared to the prior art, at least one storage tank 2 can be eliminated, meaning the number of storage tanks 2 can be only one, reducing the structural layout space and cost of the electrolyte filling device.
[0034] Multiple filtration structures 1 can increase the total amount of electrolyte filtered, preventing insufficient electrolyte in the storage tank 2 from failing to meet the battery filling requirements.
[0035] Furthermore, the inner diameter R1 of the second pipe 6 is ≥25mm.
[0036] This configuration allows for an increase in the inner diameter of the second pipe 6, thereby increasing the flow rate per unit area of the second pipe 6, and thus increasing the flow rate while increasing the flow velocity.
[0037] Continue to refer to Figure 1 and Figure 2 In some embodiments, the electrolyte filling device further includes a defoaming structure 4. The inlet of the defoaming structure 4 is connected to the outlet of the filter structure 1 via a first pipe 5, and the outlet of the defoaming structure 4 is connected to the inlet of the storage tank 2 via a third pipe 7. The defoaming structure 4 can remove air bubbles in the electrolyte, preventing air bubbles from entering the battery and affecting battery performance.
[0038] It should be noted that the structure of the defoaming structure is existing technology, so it will not be described in detail here.
[0039] The second pipe 6 is located downstream of the defoaming structure 4. The inner diameter of the second pipe 6 is greater than or equal to 16mm. Compared with the pipe diameter of the second pipe 6 in the prior art, the inner diameter of the second pipe 6 provided by this utility model is increased. In this way, while increasing the liquid inlet speed, the electrolyte flowing out from the filter structure 1 can be quickly guided by the injection pump structure 3 after entering the storage tank 2 through the second pipe 6. The electrolyte in the defoaming structure 4 will not stay in the defoaming structure 4 for too long. After the electrolyte is defoamed, it will quickly enter the storage tank 2 through the third pipe 7, thereby improving the defoaming efficiency.
[0040] In some embodiments, the first pipe 5, the second pipe 6, and the third pipe 7 have the same inner diameter.
[0041] Understandably, the inner diameters of the first pipe 5, the second pipe 6, and the third pipe 7 are larger than those of existing technologies. The first pipe 5, the second pipe 6, and the third pipe 7 are all large-diameter pipes, which can increase the flow rate of the electrolyte.
[0042] The increased diameter of the first pipe 5 will increase the filtration speed of the filter structure 1 and increase the liquid inlet of the defoaming structure 4. Meanwhile, the third pipe 7 and the second pipe 6 can increase the outflow of the defoaming structure 4, avoid the electrolyte from staying in the defoaming structure 4 for a longer period of time, improve the defoaming efficiency, and thus match the defoaming efficiency with the filtration efficiency.
[0043] like Figure 5 As shown, in some embodiments, the cross-section of the filter element 12 perpendicular to the extension direction of the filter element 12 is circular, the cross-section of the housing 11 perpendicular to the extension direction of the filter element 12 is circular, the number of filter elements 12 is at least three, and the filter elements 12 are arranged at intervals in the housing 11 along the circumference of the housing 11.
[0044] It should be noted that there can be multiple filter elements 12, which can increase the total amount of electrolyte filtered. The non-contact arrangement between filter elements 12 can provide flow space for the electrolyte, allowing electrolyte to enter from all parts of the filter element 12, thereby increasing the total amount of electrolyte filtered.
[0045] Through the above scheme, the surface area of multiple filter elements 12 is increased compared to the total area of a single filter element 12, thereby increasing the total amount of electrolyte entering the filter element 12. Since the filter elements 12 have the same filtration efficiency during the filtration process, the total amount of electrolyte filtered in the same time period is increased, which can meet the filling speed requirements of lithium batteries.
[0046] For example, taking a filter canister with a diameter of 200mm as an example: when using a single filter element 12, the filter element 12 has a maximum outer diameter of 160mm and a length of 1000mm, and the effective filtration area of a single filter element 12 is 502400mm². 2 When using a three-element filter 12 configuration, the outer diameter of each filter 12 should be no less than 80mm and its length no less than 1000mm. The effective filtration area of the three filter elements is 753600mm². 2 Therefore, under the condition of the same volume of shell 11, the effective filtration area increases by 1 / 3.
[0047] like Figure 6 As shown, in some other embodiments, the cross section of the filter element 12 perpendicular to the extension direction of the filter element 12 is semi-circular, the cross section of the housing 11 perpendicular to the extension direction of the filter element 12 is circular, the number of filter elements 12 is two, and the two filter elements 12 are arranged symmetrically along the central axis of the cross section of the housing 11 perpendicular to the extension direction of the filter element 12.
[0048] It should be noted that the filter element 12 includes an arc-shaped sidewall 121 and a straight sidewall 122, wherein the two ends of the arc-shaped sidewall 121 are respectively connected to the two ends of the straight sidewall 122. The straight sidewalls 122 of the two filter elements 12 are arranged close to each other, and the straight sidewalls 122 of the two filter elements 12 are set at a first preset distance. The first preset distance is obtained based on multiple experiments and is not specifically limited in this embodiment.
[0049] With the above scheme, the filter element 12 has an arc-shaped sidewall 121 and a straight sidewall 122, which can increase the filtration area of the filter element 12 for electrolyte, thereby filtering more electrolyte per unit time, increasing the total amount of electrolyte filtered, and meeting the requirements of lithium battery filling speed and filling volume.
[0050] like Figure 7 As shown, in some other embodiments, the cross section of the filter element 12 perpendicular to the extension direction of the filter element 12 is fan-shaped, the cross section of the housing 11 perpendicular to the extension direction of the filter element 12 is circular, the number of filter elements 12 is at least three, the filter elements 12 are distributed at intervals along the circumference of the housing 11, and the filter elements 12 are disposed at intervals along the circumference of the housing 11 inside the housing 11.
[0051] It should be noted that the filter element 12 includes an arc-shaped sidewall 121 and two straight sidewalls 122. The two ends of the arc-shaped sidewall 121 are respectively connected to the two straight sidewalls 122, and the two straight sidewalls 122 are connected to each other to form a fan-shaped structure. Since the filter element 12 is arranged along the circumference of the housing 11, the straight sidewalls 122 of two adjacent filter elements 12 are arranged close to each other, and the straight sidewalls 122 of two adjacent filter elements 12 are arranged at a second preset distance. The second preset distance is obtained based on multiple experiments and is not specifically limited in this embodiment.
[0052] With the above scheme, the filter element 12 has an arc-shaped sidewall 121 and two straight sidewalls 122, which can increase the filtration area of the filter element 12 for electrolyte, thereby filtering more electrolyte per unit time, increasing the total amount of electrolyte filtered, and meeting the requirements of lithium battery filling speed and filling volume.
[0053] In some embodiments, the filter structure 1 further includes a filter housing, and each filter element 12 is provided with a filter housing on its outside. Filter holes are uniformly opened on the outside of the filter housing, and the filter element 12 is fixedly installed inside the filter housing.
[0054] It should be noted that the filter housing has multiple filter holes, which serve to perform primary filtration of the electrolyte. Multiple filter holes increase the total amount of electrolyte passing through the filter housing. The filter holes gradually increase in volume from the outside in, meaning they are funnel-shaped.
[0055] It should be noted that each filter element is equipped with a filter housing, so the total area of the outer peripheral wall of the filter housing is S3, where S3:S2>1.
[0056] Through the above scheme, the filter shell and filter element 12 work together to achieve primary filtration and fine filtration of the electrolyte, avoiding the local blockage of the filter element 12 caused by large impurities adhering to its outer surface, and preventing the electrolyte from being unable to pass through the filter element 12. In addition, the filter pores gradually increase in volume from the outside to the inside, which can increase the contact area between the electrolyte and the filter element 12 after passing through the filter shell. As a result, the electrolyte can pass through a larger filtration area of the filter element 12, thereby improving the filtration efficiency.
[0057] In some embodiments, the filter element 12 includes a filter element body and a pleated structure disposed on the filter element body and facing the outer side wall of the housing 11.
[0058] More specifically, the pleated filter element includes a filter element body and a pleated structure disposed on the outer wall of the filter element body facing the housing 11; the pleated structure includes protrusions and grooves arranged alternately in a circumferential direction. As an optional embodiment, the cross-sections of the protrusions and grooves can be designed as arc-shaped or triangular. This embodiment uses a pleated filter element, which, compared to a conventional cylindrical filter element 12, significantly increases the surface area of the filter element 12 with the same diameter due to the presence of the pleated structure. Furthermore, the pleated structure on the outer surface of the filter element 12 can form electrolyte flow channels on the surface, giving the pleated filter element a certain degree of self-cleaning effect. In addition, it improves the efficiency of the filter element 12 in filtering electrolytes.
[0059] like Figure 3 and Figure 4 As shown, in some embodiments, the housing 11 includes a housing body 111 and a cover 112, the filter element 12 is located in the area enclosed by the housing body 111, the cover 112 is fixed to the opening of the housing body 111, and the cover 112 is detachably connected to the housing body 111.
[0060] It is understood that the cover 112 and the shell body 111 can be connected by fasteners, or the shell body 111 and the cover 112 can be connected by threads, or the shell body 111 and the cover 112 can be snapped together to achieve a detachable connection between the cover 112 and the shell body 111.
[0061] The above method allows for the replacement of filter element 12, preventing filter element 12 from becoming clogged and affecting the filtration efficiency of the electrolyte.
[0062] In some embodiments, a fixing member is provided on the side of the cover 112 facing the filter element 12, and the filter element 12 is connected to the fixing member. The fixing member can fix the position of the filter element 12, prevent the filter element 12 from rotating or moving relative to the cover 112, and ensure that the filter element 12 can work normally.
[0063] In some other embodiments, the top of the filter element 12 abuts against the cover 112. After the cover 112 is connected to the housing body 111, the cover 112 can apply a moving compressive force to the top of the filter element 12, thus preventing the filter element 12 from rotating relative to the housing body 112.
[0064] The cover 112 is provided with an electrolyte inlet pipe 13 and an electrolyte outlet pipe. The number of electrolyte inlet pipes 13 is not limited to one, and the number of electrolyte outlet pipes is not limited to one. The outlet of the filter element 12 is connected to the electrolyte outlet pipe, and the electrolyte inlet pipe 13 is connected to the cavity formed by the shell body 111 and the cover 112.
[0065] Furthermore, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.
Claims
1. An electrolyte filling device, characterized in that, include: A filter structure (1) is used to filter electrolyte. The filter structure (1) includes a housing (11) and at least two filter elements (12). The filter elements (12) are installed inside the housing (11). The total filtration area of the filter elements (12) is S1, and the area of the inner peripheral wall of the housing (11) is S2, where S1:S2>1. Storage tank (2), connected to the filter structure (1) via a first pipeline (5), is used to store the filtered electrolyte; The injection pump structure (3) is connected to the storage tank (2) through a second pipeline (6). The injection pump structure (3) provides power to the electrolyte in the storage tank (2). The inner diameter of the second pipeline (6) is R1, and R1≥16mm.
2. The electrolyte filling device according to claim 1, characterized in that, The inner diameter R1 of the second pipeline (6) is ≥25mm.
3. The electrolyte filling device according to claim 1 or 2, characterized in that, The electrolyte filling device also includes a defoaming structure (4), the inlet of the defoaming structure (4) is connected to the outlet of the filter structure (1) through the first pipeline (5), and the outlet of the defoaming structure (4) is connected to the inlet of the storage tank (2) through the third pipeline (7).
4. The electrolyte filling device according to claim 3, characterized in that, The first pipe (5), the second pipe (6), and the third pipe (7) have the same inner diameter.
5. The electrolyte filling device according to claim 1 or 2, characterized in that, The filter element (12) has a circular cross-section perpendicular to the extension direction of the filter element (12), and the housing (11) has a circular cross-section perpendicular to the extension direction of the filter element (12). The number of filter elements (12) is at least three, and the filter elements (12) are arranged at intervals along the circumference of the housing (11) inside the housing (11).
6. The electrolyte filling device according to claim 1 or 2, characterized in that, The cross section of the filter element (12) perpendicular to the extension direction of the filter element (12) is semi-circular, and the cross section of the housing (11) perpendicular to the extension direction of the filter element (12) is circular. There are two filter elements (12), and the two filter elements (12) are arranged symmetrically along the central axis of the cross section of the housing (11) perpendicular to the extension direction of the filter element (12).
7. The electrolyte filling device according to claim 1 or 2, characterized in that, The filter element (12) has a fan-shaped cross section perpendicular to its extension direction, and the housing (11) has a circular cross section perpendicular to its extension direction. The number of filter elements (12) is at least three. The filter elements (12) are distributed at intervals along the circumference of the housing (11), and the filter elements (12) are arranged at intervals along the circumference of the housing (11) inside the housing (11).
8. The electrolyte filling device according to claim 1 or 2, characterized in that, The filter structure (1) further includes a filter shell. Each filter element (12) is provided with a filter shell on its outside. Filter holes are uniformly opened on the outside of the filter shell. The filter element (12) is fixedly installed inside the filter shell.
9. The electrolyte filling device according to claim 1 or 2, characterized in that, The filter element (12) includes a filter element body and a pleated structure disposed on the outer side wall of the filter element body facing the housing (11).
10. The electrolyte filling device according to claim 1 or 2, characterized in that, The housing (11) includes a housing body (111) and a cover (112). The filter element (12) is located in the area enclosed by the housing body (111). The cover (112) is fixed to the opening of the housing body (111). The cover (112) is detachably connected to the housing body (111).