Cell wetting device

Abstract

This utility model relates to the field of battery technology and discloses a cell immersion device, including a housing, a bracket, a heating mechanism, and a positive pressure mechanism. The housing includes a main body and a cover, with the cover sealingly fastened to the open end of the main body to form a sealed cavity. The bracket supports a cell filled with electrolyte with its filling port open, and is located within the sealed cavity. The heating mechanism includes a heating element, a power connector, and a power interface. The power interface is located at the bottom of the housing, the heating element is mounted on the bracket and electrically connected to the power connector, and the power connector is located at the bottom of the bracket and plugs into the power interface. The heating element heats the cell. The positive pressure mechanism is connected to the housing and is used to adjust the pressure within the sealed cavity. This cell immersion device can effectively improve the cell immersion efficiency.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cell wetting device. Background Technology

[0002] Traditional battery wetting typically involves high-temperature, atmospheric-pressure settling after electrolyte injection to increase electrolyte movement and ensure thorough wetting of the cell's internal pores. However, due to the small pores of the electrodes and separator within the cell, overcoming the surface tension caused by these pores requires more than just high-temperature, atmospheric-pressure settling, resulting in low wetting efficiency. It can take up to 24 hours or even longer to fully wet the cell. Utility Model Content

[0003] The purpose of this utility model embodiment is to provide a battery cell wetting device that can improve battery cell wetting efficiency.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A battery cell wetting apparatus is provided, comprising:

[0006] The box includes a box body and a cover, wherein the cover is sealed and fastened to the open end of the box body to form a sealed cavity;

[0007] A bracket is used to support a battery cell filled with electrolyte with the electrolyte inlet open, and the bracket is located inside the sealed cavity;

[0008] The heating mechanism includes a heating element, a power terminal, and a power interface. The power interface is located at the bottom of the housing. The heating element is located on the bracket and electrically connected to the power terminal. The power terminal is located at the bottom of the bracket and plugs into the power interface. The heating element can heat the battery cell.

[0009] A positive pressure mechanism, which is connected to the housing, is used to adjust the pressure of the sealed cavity.

[0010] As a further embodiment of the cell immersion device, a negative pressure mechanism is also included, which is connected to the housing and is used to adjust the pressure of the sealed cavity.

[0011] As a further embodiment of the cell immersion device, the bracket includes two spaced-apart support frames and a plurality of trays spaced-apart along the vertical direction. The two ends of the trays along their length direction are connected to the two support frames. The heating element is embedded in the tray and is connected to the power receiving end through an electrical connection part. The power receiving end is located on the lower surface of the lowest tray.

[0012] As a further embodiment of the cell immersion device, the upper surface of the tray is provided with a plurality of positioning grooves, each of which is used to position a cell.

[0013] As a further embodiment of the cell immersion device, the support frame is provided with a plurality of adjustable elongated holes spaced vertically. The length of the adjustable elongated holes extends vertically. Except for the bottommost tray, the two ends of the other trays along their length direction are respectively inserted into the corresponding adjustable elongated holes, and can move along the length direction of the adjustable elongated holes to abut against the upper end of the corresponding lower layer of cell. In two adjacent layers of trays, the upper tray has a clearance hole corresponding to the liquid injection port of the cell on the lower tray. The clearance hole is offset from the positioning groove.

[0014] As a further embodiment of the cell immersion device, an elastic structure is also included. Several sets of elastic structures are spaced vertically along the outer side of each support frame. Each elastic structure corresponds one-to-one with the remaining trays except for the bottommost tray. Each elastic structure includes a spring seat, a spring, and a top plate. The spring seat is fixed to the outer side of the support frame. The spring is mounted on the spring seat and connected to the top plate. The top plate is located on the outer side of the support frame and abuts against the upper end of the spring. The tray extends through the adjustment elongated hole to contact the upper surface of the top plate. The spring causes the top plate to always have an upward tendency, so that the distance between two adjacent trays in an unloaded state is greater than the height of the cell.

[0015] As a further embodiment of the cell immersion device, it also includes multiple temperature and pressure sensors, which are spaced apart within the sealed cavity.

[0016] As a further embodiment of the cell immersion device, a pressure display and a temperature display are also included. The pressure display and the temperature display are mounted on the outside of the housing body and are connected to the temperature and pressure sensor to display the temperature and pressure inside the sealed cavity.

[0017] As a further embodiment of the cell immersion device, the housing also includes a sealing ring located between the cover and the housing body. The cover is snapped and fixed to the housing body, and the sealing ring is pressed against the housing body.

[0018] As a further embodiment of the cell immersion device, the cover is provided with a sealing groove on the side facing the main body of the box, and the sealing ring is embedded in the sealing groove and partially protrudes from the cover.

[0019] Beneficial effects:

[0020] In this invention, the heating element is mounted on a bracket. The bottom of the bracket, where the battery cells are placed, is aligned with the power interface inside the housing. Placing the bracket inside the housing enables electrical conduction of the heating element, heating the battery cells on the bracket and maintaining the electrolyte within a suitable temperature range. Simultaneously, a positive pressure mechanism regulates the air pressure within the sealed cavity. Because the battery cell's injection port is not sealed, the air pressure inside the battery cell cavity remains consistent with the air pressure inside the sealed cavity. The positive pressure overcomes the surface tension caused by the pores of the electrodes and diaphragm in the core package, allowing the electrolyte to quickly penetrate into the electrode pores and diaphragm, improving the wettability of the solid-liquid interface. This reduces the standing time required for atmospheric pressure wetting and effectively improves the battery cell wetting efficiency. Attached Figure Description

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the cell wetting device described in Embodiment 1 of this utility model;

[0023] Figure 2 This is a schematic diagram of the internal structure of the battery cell described in Embodiment 1 of this utility model;

[0024] Figure 3 This is a top view schematic diagram of the battery cell described in Embodiment 1 of this utility model;

[0025] Figure 4 This is an exploded view of the heating element and tray according to Embodiment 1 of this utility model;

[0026] Figure 5 This is a top view of the tray (not the bottom layer) described in Embodiment 1 of this utility model;

[0027] Figure 6 This is a schematic diagram of the bracket (loaded with battery cells) inside the box body as described in Embodiment 2 of this utility model;

[0028] Figure 7 This is a side view of the support frame described in Embodiment 2 of this utility model;

[0029] Figure 8 This is a top view of the tray (not the bottom layer) described in Embodiment 2 of this utility model;

[0030] Figure 9 This is a schematic diagram of the bracket (in an unloaded state) inside the box body according to Embodiment 3 of this utility model.

[0031] In the picture:

[0032] 1. Battery cell; 11. Housing; 111. Electrolyte inlet; 112. Cavity; 12. Core package; 13. Electrolyte;

[0033] 100. Box body; 1001. Sealed cavity; 110. Box body; 120. Cover; 130. Sealing ring; 200. Bracket; 210. Support frame; 211. Adjustment elongated hole; 220. Tray; 221. First heat-conducting plate; 222. Second heat-conducting plate; 223. Positioning groove; 224. Clearance hole; 300. Heating mechanism; 310. Heating element; 320. Power connection terminal; 400. Positive pressure mechanism; 500. Negative pressure mechanism; 600. Elastic structure; 610. Spring seat; 620. Spring; 630. Top plate; 700. Temperature and pressure sensor; 800. Pressure display; 900. Temperature display. Detailed Implementation

[0034] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] 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.

[0036] 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.

[0037] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationships shown in the accompanying drawings. They are used solely for ease of description and simplification of operation, and do not indicate or imply that the device or component 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. Furthermore, the terms "first," "second," etc., are merely used for distinction in description and have no special meaning.

[0038] Example 1

[0039] like Figures 1 to 3 As shown, this embodiment provides a battery cell immersion device, including a housing 100, a bracket 200, a heating mechanism 300, and a positive pressure mechanism 400. The housing 100 includes a main body 110 and a cover 120, with the cover 120 sealingly fastened to the open end of the main body 110 to form a sealed cavity 1001. The bracket 200 supports the battery cell 1 filled with electrolyte 13 with the injection port 111 open, and is located within the sealed cavity 1001. The heating mechanism 300 includes a heating element 310, a power connection terminal 320, and a power interface. The power interface is located at the bottom of the housing 100, the heating element 310 is mounted on the bracket 200 and electrically connected to the power connection terminal 320, and the power connection terminal 320 is located at the bottom of the bracket 200 and plugs into the power interface. The heating element 310 heats the battery cell 1. The positive pressure mechanism 400 is connected to the housing 100 and is used to adjust the pressure in the sealed cavity 1001.

[0040] In this embodiment, the battery cell 1 refers to a battery cell 1 whose injection port 111 is not sealed after electrolyte injection. It includes a housing 11, a core package 12 housed within the housing 11, and an electrolyte 13. The housing 11 has an injection port 111, and the core package 12 includes porous electrodes and a diaphragm. The electrolyte 13 completely fills the housing 11, leaving a cavity 112 in the upper part of the housing 11. The cavity 112 communicates with the sealed cavity 1001 through the injection port 111, thereby forming an isobaric space and ensuring that the pressure in the cavity 112 and the sealed cavity 1001 is equal.

[0041] In this embodiment, the heating element 310 is mounted on the bracket 200. The power terminal 320 at the bottom of the bracket 200, where the battery cell 1 is placed, is aligned with the power interface inside the housing 110. Once the bracket 200 is placed inside the housing 110, the heating element 310 is electrically connected, heating the battery cell 1 on the bracket 200 and maintaining the electrolyte 13 within a suitable temperature range, thereby improving the wetting efficiency of the electrolyte 13. In this embodiment, the insertion and engagement of the power terminal 320 and the power interface serves to position the bracket 200 within the housing 110. Since the electrolyte inlet 111 of the cell 1 is open, the pressure inside the cell 1 is consistent with the pressure inside the sealed cavity 1001. By injecting air into the sealed cavity 1001 through the positive pressure mechanism 400, the cell 1 can be kept under a high pressure state with the same pressure as the sealed cavity 1001. The high pressure can force the electrolyte 13 to penetrate into the electrode pores and the separator more quickly, improve the wettability of the solid-liquid interface, thereby reducing the standing time required for normal pressure wetting and effectively improving the battery production efficiency.

[0042] For example, the temperature of the electrolyte 13 can be controlled between 20-60°C by the heating element 310. Below 20°C, the diffusion power of the electrolyte 13 decreases, which is not conducive to wetting. Above 60°C, the composition of the electrolyte 13 is prone to deterioration, affecting the performance of the battery cell 1. In this embodiment, the positive pressure mechanism 400 can be a compressor. After the housing 100 is sealed, the pressure of the sealed cavity 1001 can be adjusted within the range of 0-10MPa by the compressor.

[0043] In this embodiment, the box body 110 and the cover 120 are made of high-strength materials and can withstand high pressure ≥20MPa.

[0044] In this embodiment, the heating mechanism 300 and the positive pressure mechanism 400 are combined to achieve rapid wetting of the electrolyte 13.

[0045] Furthermore, the battery cell immersion device in this embodiment also includes a negative pressure mechanism 500, which is connected to the housing 100 and is used to adjust the pressure of the sealing cavity 1001.

[0046] In this embodiment, the pressure of the sealing cavity 1001 can be adjusted using the positive pressure mechanism 400 and the negative pressure mechanism 500, so that the pressure in the sealing cavity 1001 can achieve an alternating positive and negative pressure cycle. The negative pressure can extract the air from the electrode pores and the diaphragm, reduce the air resistance when the electrolyte 13 is filled, and force the electrolyte 13 to quickly enter the pores "emptied" by the negative pressure. The positive pressure enhances the penetration depth of the electrolyte 13, that is, the positive pressure makes the pressure of the cavity 112 of the cell 1 greater than the gas pressure in the pores of the electrodes and the diaphragm, so that the electrolyte 13 is wetted into the pores. In this embodiment, the alternating positive and negative pressure cycle can simulate the "breathing effect", promote the uniform distribution of the electrolyte 13 among the multilayer electrodes, and further improve the wetting efficiency of the electrolyte 13.

[0047] The negative pressure mechanism 500 can be a vacuum pump. After the high pressure is released, the vacuum pump can be used to evacuate the sealing cavity 1001. The air pressure in the sealing cavity 1001 can be adjusted within the range of -99kPa to 0 (excluding 0).

[0048] Furthermore, the bracket 200 includes two spaced-apart support frames 210 and a plurality of trays 220 spaced-apart along the vertical direction. The heating element 310 is embedded in the tray 220. The two ends of the tray 220 along its length direction are connected to the two support frames 210. The heating element 310 is connected to the power terminal 320 through an electrical connection part (not shown in the figure). The power terminal 320 is located on the lower surface of the bottom tray 220.

[0049] In this embodiment, the tray 220 on the bracket 200 is designed as a multi-layer structure, and multiple battery cells 1 can be placed on each tray 220, so that multiple battery cells 1 with open liquid injection ports 111 can be immersed at the same time.

[0050] Optionally, the heating element 310 is a resistance wire; the resistance wire is embedded in the tray 220, which allows the resistance wire to maintain stable contact with the tray 220, improves the heating effect of the tray 220, and avoids the resistance wire being exposed, thus preventing it from affecting the stability of the battery cell 1 on the tray 220. In other embodiments, the heating element 310 may also be other types of heaters, which will not be described in detail here.

[0051] For example, such as Figure 4 As shown, the tray 220 includes a first heat-conducting plate 221 and a second heat-conducting plate 222 stacked vertically. The resistance wire is located between the first heat-conducting plate 221 and the second heat-conducting plate 222. The two ends of the first heat-conducting plate 221 and the second heat-conducting plate 222 are flush along their length and are respectively connected to the support frame 210. In order to improve the clamping stability of the resistance wire, the first heat-conducting plate 221 and the second heat-conducting plate 222 are fixedly connected by bolts. The corresponding threaded holes are countersunk holes to avoid the bolts being exposed and affecting the placement stability of the battery cell 1. The tray 220 of this embodiment adopts a double-layer heat-conducting plate structure, which can not only facilitate the installation of the resistance wire, but also has good structural strength and can stably support the battery cell 1.

[0052] The electrical connection part can be a conductive wire, which is embedded in the side of the support frame 210.

[0053] Furthermore, the resistance wire is arranged in a meandering or mesh-like structure, which can increase the contact area between the resistance wire and the tray 220 and improve the heating rate of the electrolyte 13. At least one of the two opposing sides of the first heat-conducting plate 221 and the second heat-conducting plate 222 is provided with a mounting groove (not shown in the figure) for mounting the resistance wire to avoid uneven heating of the tray 220 due to movement of the resistance wire.

[0054] In this embodiment, the first heat-conducting plate 221 and the second heat-conducting plate 222 are aluminum plates, which are lightweight and have sufficient structural strength.

[0055] like Figure 5 As shown, the upper surface of the tray 220 is provided with multiple positioning slots 223, each positioning slot 223 is used to position a battery cell 1.

[0056] By setting the positioning groove 223, the battery cell 1 can be quickly positioned on the tray 220. At the same time, the design of the positioning groove 223 can also increase the contact area between the tray 220 and the battery cell 1, thereby improving the heating efficiency of the electrolyte 13 and enabling the electrolyte 13 to quickly reach the set temperature.

[0057] Furthermore, the battery cell immersion device in this embodiment also includes a plurality of temperature and pressure sensors 700, which are spaced apart within the sealed cavity 1001.

[0058] By installing multiple temperature and pressure sensors 700 at intervals within the sealed cavity 1001, and connecting these sensors to the controller, the temperature and pressure in multiple areas within the sealed cavity 1001 can be monitored, improving monitoring accuracy and preventing inaccurate monitoring results due to the failure of any single sensor. When the temperature exceeds the warning value, the controller can control the power supply to start or automatically stop the heating element 310. When the pressure exceeds the set range, the controller can stop the positive pressure mechanism 400 or the negative pressure mechanism 500 from operating.

[0059] In this embodiment, "pressure" specifically refers to air pressure. The temperature and pressure sensor 700 refers to a temperature sensor and a pressure sensor integrated into one unit; its structure is conventional technology in the field and will not be described in detail further.

[0060] Of course, in other embodiments, separate temperature sensors and separate pressure sensors may also be used.

[0061] Furthermore, each support frame 210 has multiple temperature and pressure sensors 700 spaced apart on its outer side.

[0062] In this embodiment, the temperature and pressure sensor 700 is set on the outer side of the support frame 210. This position is closer to the battery cell 1, and the temperature and pressure parameters monitored are closer to the actual temperature of the electrolyte 13 inside the battery cell 1, thereby improving the monitoring accuracy.

[0063] In other embodiments, temperature and pressure sensors 700 can also be placed on the side of each tray 220 to more accurately monitor the temperature of the tray 220 and the battery cell 1.

[0064] like Figure 1As shown, the battery cell immersion device in this embodiment also includes a pressure display 800 and a temperature display 900. The pressure display 800 and the temperature display 900 are installed on the outside of the housing body 110. The pressure display 800 and the temperature display 900 are connected to the temperature and pressure sensor 700 to display the temperature and pressure inside the sealed cavity 1001.

[0065] In this embodiment, by placing the pressure display 800 and temperature display 900 on the outside of the box body 110, the pressure and temperature inside the sealed cavity 1001 can be observed directly.

[0066] In this embodiment, the box body 100 also includes a sealing ring 130, which is located between the cover 120 and the box body 110. The cover 120 is snapped and fixed to the box body 110, and the sealing ring 130 is pressed against the box body 110.

[0067] In this embodiment, a sealing ring 130 is provided between the box body 110 and the cover 120. When the cover 120 and the box body 110 are snapped together, a seal can be achieved. In this embodiment, the cover 120 and the box body 110 are snapped together to facilitate the placement and removal of the bracket 200.

[0068] Furthermore, a sealing groove is provided around the side of the cover 120 facing the box body 110, and a sealing ring 130 is embedded in the sealing groove and partially protrudes from the cover 120.

[0069] In this embodiment, the sealing ring 130 is embedded in the sealing groove on the cover 120. When no external force is applied, the sealing ring 130 is always located in the sealing groove. When installing the cover 120, the cover 120 can be directly snapped and fixed to the box body 110 to achieve sealing. The operation is convenient and quick.

[0070] Optionally, the latching mechanism between the lid 120 and the case body 110 can adopt a conventional latching lock structure for trolley cases, which will not be described in detail here.

[0071] Example 2

[0072] like Figures 6 to 8As shown, this embodiment is basically the same as the first embodiment above, except that the support frame 210 is provided with a plurality of adjustment elongated holes 211 at intervals along the vertical direction. The length of the adjustment elongated holes 211 extends along the vertical direction. Except for the bottom tray 220, the two ends of the other trays 220 along their length direction are respectively inserted into the corresponding adjustment elongated holes 211, and can move along the length direction of the adjustment elongated holes 211 to abut against the upper end of the corresponding lower layer of battery cell 1. In the two adjacent layers of trays 220, the upper tray 220 is provided with a clearance hole 224 corresponding to the liquid injection port 111 of the battery cell 1 on the lower tray 220. The clearance hole 224 is staggered from the positioning groove 223, that is, the positioning groove 223 on each tray 220 is directly opposite to the clearance hole 224 on the upper layer tray 220.

[0073] In this embodiment, the support frame 210 is provided with an adjustment elongated hole 211. When it is necessary to place the battery cell 1, the upper tray 220 is lifted upwards to place the battery cell 1 at the positioning groove 223 position on the lower tray 220. After the battery cell 1 is placed on the lower tray 220, the tray 220 presses against the upper end of the battery cell 1 on the lower tray 220 under its own weight, which can improve the stability of the battery cell 1 on the tray 220 and prevent the battery cell 1 from shaking during the air pressure adjustment process in the sealed cavity 1001, thus affecting the wetting effect. In this embodiment, by providing an adjustment elongated hole 211 on the support frame 210, more trays 220 can be added, so that multiple layers of battery cells 1 can form a stacked structure, increasing the number of battery cells 1 that can be wetted at one time. The liquid injection port 111 of the battery cell 1 is exposed through the avoidance hole 224, so that the environment of the electrolyte 13 in the battery cell 1 is always at the same pressure as the sealed cavity 1001. In particular, on the same tray 220, the positions of the battery cell 1 and the clearance hole 224 are staggered.

[0074] Example 3

[0075] The cell wetting device in this embodiment is basically the same as that in Embodiment 2 above, except that it also includes an elastic structure 600, such as... Figure 9 As shown, each support frame 210 has several sets of elastic structures 600 spaced vertically on its outer side. Each elastic structure 600 corresponds one-to-one with the remaining trays 220 except for the bottom tray 220. Each elastic structure 600 includes a spring seat 610, a spring 620, and a top plate 630. The spring seat 610 is fixed to the outer side of the support frame 210. The spring 620 is mounted on the spring seat 610 and connected to the top plate 630. The top plate 630 is located on the outer side of the support frame 210 and abuts against the upper end of the spring 620. The tray 220 extends through the adjustment elongated hole 211 to contact the upper surface of the top plate 630. The spring 620 ensures that the top plate 630 always has an upward tendency, so that the distance between two adjacent trays 220 in an unloaded state is greater than that of the battery cell 1 (reference). Figure 6 (height)

[0076] In this embodiment, the elastic structure 600 drives the corresponding tray 220 to move upward, making the distance between the tray 220 and its lower tray 220 greater than the height of the battery cell 1. This ensures sufficient space between adjacent trays 220 for placing the battery cell 1. When the battery cell 1 is placed in the positioning groove 223 on the lower tray 220, there is no need to manually lift the upper tray 220, making operation convenient. After the battery cell 1 is installed on the upper tray 220, the upper tray 220 and the battery cell 1 automatically press down against the elastic force of the elastic structure 600, with the upper tray 220 pressing against the upper end of the battery cell 1 on the lower tray 220.

[0077] In this embodiment, in order to improve the stability of the elastic structure 600, at least one guide rod can be designed for each group of elastic structures 600. The upper end of the guide rod is fixedly connected to the top plate 630, and the lower end passes through the spring seat 610 and can move up and down along the spring seat 610. The lower end of the guide rod is provided with a limiting part, which is located at the lower end of the spring seat 610 to prevent the guide rod from separating from the spring seat 610. The spring 620 is sleeved on the guide rod and abuts against the top plate 630 and the spring seat 610 respectively.

[0078] Example 4

[0079] This embodiment also provides a cell impregnation method. Using the cell impregnation device of any of the above embodiments, the cell impregnation method of this embodiment is as follows: place the cell 1 filled with electrolyte 13 and with the injection port 111 in an open state on the bracket 200, then align the power terminal 320 at the bottom of the bracket 200 with the power interface at the bottom of the housing 100 and plug it in to enable the heating element 310 to be energized to heat the bracket 200, and then close the cover 120 to form a sealed cavity 1001; then let it stand under high pressure or under alternating positive and negative pressure conditions until the cell 1 reaches saturation liquid absorption.

[0080] Using 45°C at normal pressure as the control group, and high pressure or alternating positive and negative pressure in this embodiment as the experimental group, the saturated liquid absorption volume and the time to reach the saturated liquid absorption volume of the control group and each experimental group were tested. The immersion process parameters and test results are shown in Table 1.

[0081] Table 1. Cell wetting parameters

[0082]

[0083]

[0084] Note: Saturated electrolyte absorption capacity refers to the weight of electrolyte absorbed by the battery cell core when the weight of the core no longer increases during the static process.

[0085] As can be seen from Table 1, the cell impregnation method of this embodiment can effectively shorten the impregnation time, improve the impregnation efficiency, and reduce the manufacturing cost.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell wetting device, characterized in that, include: The box includes a box body and a cover, wherein the cover is sealed and fastened to the open end of the box body to form a sealed cavity; A bracket is used to support a battery cell filled with electrolyte with the electrolyte inlet open, and the bracket is located inside the sealed cavity; The heating mechanism includes a heating element, a power terminal, and a power interface. The power interface is located at the bottom of the housing. The heating element is located on the bracket and electrically connected to the power terminal. The power terminal is located at the bottom of the bracket and plugs into the power interface. The heating element can heat the battery cell. A positive pressure mechanism, which is connected to the housing, is used to adjust the pressure of the sealed cavity.

2. The cell wetting apparatus according to claim 1, characterized in that, It also includes a negative pressure mechanism, which is connected to the housing and is used to adjust the pressure of the sealed cavity.

3. The cell wetting apparatus according to claim 1, characterized in that, The bracket includes two spaced-apart support frames and multiple trays spaced-apart along the vertical direction. The two ends of each tray along its length are connected to the two support frames. The heating element is embedded in the tray and is connected to the power receiving end via an electrical connection part. The power receiving end is located on the lower surface of the lowest tray.

4. The cell wetting apparatus according to claim 3, characterized in that, The upper surface of the tray has multiple positioning slots, each of which is used to position a battery cell.

5. The cell wetting apparatus according to claim 4, characterized in that, The support frame is provided with a plurality of adjustable elongated holes spaced vertically. The length of the adjustable elongated holes extends vertically. Except for the bottom tray, the two ends of the other trays along their length direction are respectively inserted into the corresponding adjustable elongated holes and can move along the length direction of the adjustable elongated holes to abut the upper end of the corresponding lower layer of battery cell. In two adjacent layers of trays, the upper tray has a clearance hole corresponding to the liquid injection port of the battery cell on the lower tray. The clearance hole is offset from the positioning groove.

6. The cell wetting apparatus according to claim 5, characterized in that, It also includes elastic structures, with several sets of elastic structures spaced vertically on the outer side of each support frame. Each elastic structure corresponds one-to-one with the remaining trays except for the bottom tray. Each elastic structure includes a spring seat, a spring, and a top plate. The spring seat is fixed to the outer side of the support frame. The spring is mounted on the spring seat and connected to the top plate. The top plate is located on the outer side of the support frame and abuts against the upper end of the spring. The tray extends through the adjustment elongated hole to contact the upper surface of the top plate. The spring causes the top plate to always have an upward tendency, so that the distance between two adjacent trays in the unloaded state is greater than the height of the battery cell.

7. The cell wetting apparatus according to claim 1, characterized in that, It also includes multiple temperature and pressure sensors, which are spaced apart within the sealed cavity.

8. The cell wetting apparatus according to claim 7, characterized in that, It also includes a pressure display and a temperature display, which are mounted on the outside of the housing body and connected to the temperature and pressure sensor to display the temperature and pressure inside the sealed cavity.

9. The cell wetting apparatus according to any one of claims 1 to 8, characterized in that, The box also includes a sealing ring, which is located between the cover and the box body. The cover is snapped and fixed to the box body, and the sealing ring is pressed against the box body.

10. The cell wetting apparatus according to claim 9, characterized in that, The cover has a sealing groove on the side facing the box body, and the sealing ring is embedded in the sealing groove and partially protrudes from the cover.

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