Battery liquid injection device and formation equipment

Abstract

The invention relates to the technical field of battery processing equipment, and discloses a battery liquid injection device and formation equipment, the battery liquid injection device comprises a first cup body and a second cup body, the first cup body and the second cup body are communicated through a cup body channel; the inflow channel is suitable for communicating the first cup body with the liquid storage device; the valve rod is suitable for moving in the height direction of the first cup body so as to selectively block the inflow channel and the cup body channel, and when the inflow channel is blocked, the cup body channel is in a conducting state; when the inflow channel is conducted, the cup body channel is in a conducted state; a blocking structure is arranged on the valve rod and used for blocking the inflow channel. According to the battery liquid injection device provided by the invention, the flow direction of the electrolyte can be controlled only by using the valve rod, liquid preparation in the first cup body and liquid supplementation in the second cup body are realized, a valve for controlling during external electrolyte transmission is omitted, and the structural form is simplified.

Description

Technical Field

[0001] The present invention relates to the technical field of battery processing equipment, and in particular to a battery liquid injection device and formation equipment. Background Art

[0002] The manufacturing of batteries requires the process of filling, standing and forming in sequence. In the related art, the forming machine has no function of replenishing electrolyte. After formation, a secondary filling machine is required for filling. During the filling process of the secondary filling machine, electrolyte loss will occur. Summary of the invention

[0003] In view of this, the present invention provides a battery liquid injection device and a formation device to solve the problem that the formation machine cannot be replenished with liquid for a second time after the formation is completed.

[0004] In a first aspect, the present invention provides a battery liquid injection device, comprising:

[0005] The first cup body and the second cup body are connected to each other via a cup body channel;

[0006] An inlet channel, adapted to connect the first cup body with the liquid storage device;

[0007] The valve stem is adapted to move along the height direction of the first cup body to selectively block the inlet channel and the cup channel. When the inlet channel is blocked, the cup channel is in a conducting state; when the inlet channel is conducting, the cup channel is in a conducting state;

[0008] A blocking structure is provided on the valve stem for blocking the inlet channel.

[0009] Beneficial effects: The battery filling device provided by the embodiment of the present invention eliminates the external pipeline switch, adopts two connected cup bodies, controls the valve stem to move along the height direction of the first cup body, and uses the valve stem to control the conduction and closing of the inlet channel and the conduction and closing of the cup channel, so as to accurately control the injection amount, prevent the residual electrolyte in the pipeline from flowing into the filling device, and improve the consistency of injection; the inlet channel and the cup channel are selectively connected; thus, only the valve stem is used to control the flow direction of the electrolyte, and the preparation of the first cup body and the replenishment of the second cup body are realized, the valve controlled during the external electrolyte transmission is omitted, and the structural form is simplified.

[0010] In a second aspect, the present invention further provides a formation device, comprising: the battery liquid injection device as described above.

[0011] Since the formation equipment includes a battery liquid injection device, which has the same effect as the battery liquid injection device, it will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a schematic diagram of the cooperation between the formation equipment and the battery of the present invention;

[0014] Figure 2 This is a schematic diagram of the valve stem of the first battery liquid injection device of the present invention being in a liquid preparation state;

[0015] Figure 3 This is a schematic diagram of the valve stem of the first battery liquid filling device of the present invention being in a liquid filling state;

[0016] Figure 4 This is a schematic diagram of a valve stem of a second battery liquid injection device of the present invention in a liquid preparation state;

[0017] Figure 5 This is a schematic diagram of a valve stem of a second battery liquid filling device of the present invention in a liquid filling state;

[0018] Figure 6 This is a schematic diagram of a valve stem of a third battery liquid injection device of the present invention in a liquid preparation state;

[0019] Figure 7 This is a schematic diagram of a valve stem of a third battery liquid filling device of the present invention in a liquid filling state;

[0020] Figure 8 It is a schematic diagram of the liquid medium of the present invention being in the liquid storage device;

[0021] Fig. 9 It is a schematic diagram of the liquid medium flowing into the first cup body when the battery liquid filling device of the present invention is in a liquid preparation state;

[0022] Fig.10 It is a schematic diagram of the liquid medium flowing into the second cup body when the battery liquid filling device of the present invention is in the liquid filling state.

[0023] Description of reference numerals:

[0024] 1. Battery liquid injection device; 11. First partition plate; 111. Inlet channel;

[0025] 12. valve stem; 121. first groove portion; 122. second groove portion; 123. first flow blocking portion; 124. second flow blocking portion;

[0026] 13. first cup body; 131. cup body channel; 132. air source channel;

[0027] 14. second cup body; 15. discharge port; 16. shielding portion; 17. second partition plate;

[0028] 2. Liquid storage device; 3. Gas source device; 4. Battery; 100. Electrolyte. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] The manufacture of batteries needs to go through the processes of injection, standing and formation in sequence. Among them, injection refers to the injection of electrolyte into the battery shell. Standing refers to placing the battery statically for a period of time after injection, and the standing time is usually between 8 hours and 72 hours; the purpose of standing is to allow the electrode to be fully infiltrated by the electrolyte, so as to facilitate the subsequent formation process to form a uniform and dense solid electrolyte interface film on the surface of the electrode. Formation refers to the first charging of the manufactured battery to form a passivation layer on the surface of the electrode, which can well prevent the active material from collapsing and falling off, and ensure the excellent charging and discharging performance and long service life of the battery. The formation process requires a formation machine. In the related art, due to the single function of the formation machine and the lack of electrolyte replenishment function, a secondary injection machine is required for replenishment after the formation is completed, and electrolyte loss will occur during the replenishment process of the secondary injection machine. In addition, in the related art, the formation machine often maintains a negative pressure during the formation process, which is easy to cause insufficient electrolyte retention in the battery, thereby causing battery interface defects and reduced cycle performance.

[0034] The battery filling device provided by the embodiment of the present invention can make up for the defect of single function of the formation machine, cancel the secondary filling process after the formation is completed, reduce the electrolyte loss during the secondary filling process, and avoid the equipment procurement cost of the secondary filling machine.

[0035] Combine the following Figures 1 to 10 , describing an embodiment of the present invention.

[0036] According to an embodiment of the present invention, on the one hand, a battery liquid filling device 1 is provided, comprising:

[0037] The first cup body 13 and the second cup body 14 are connected to each other via a cup body channel 131;

[0038] The inlet channel 111 is suitable for connecting the first cup body 13 with the liquid storage device 2;

[0039] The valve stem 12 is adapted to move along the height direction of the first cup body 13 to selectively block the inlet channel 111 and the cup channel 131. When the inlet channel 111 is blocked, the cup channel 131 is in a conducting state; when the inlet channel 111 is conducting, the cup channel 131 is in a conducting state;

[0040] A blocking structure is provided on the valve stem 12 for blocking the inlet channel 111 .

[0041] The first cup body 13 and the second cup body 14 both form a receiving cavity for receiving electrolyte. In this embodiment, the first cup body 13 is used to hold the electrolyte delivered by the liquid storage device 2, and to prepare the electrolyte for the subsequent battery 4 refilling process. The first cup body 13 and the second cup body 14 are connected via the cup body channel 131; the second cup body 14 is used to receive the electrolyte delivered by the first cup body 13, and is suitable for injecting the electrolyte into the battery 4.

[0042] In some embodiments, a discharge port 15 is formed at the bottom of the second cup body 14 , and the discharge port 15 is suitable for being aligned with the liquid injection hole of the battery 4 , so as to facilitate injecting the electrolyte in the second cup body 14 into the battery 4 .

[0043] In the related art, the battery filling device is connected to the external liquid storage device, and a switch valve is set on the passage. However, there is a filling pipeline between the switch valve and the cup body. After the valve is opened for filling, electrolyte will remain in the filling pipeline, resulting in inaccurate amount of electrolyte in the measuring cup, making it impossible to uniformly control the filling amount of each battery, affecting the consistency of battery filling.

[0044] The battery filling device provided by the embodiment of the present invention eliminates the external pipeline switch, adopts two connected cup bodies, controls the valve stem 12 to move along the height direction of the first cup body 13, and uses the valve stem 12 to control the opening and closing of the inlet channel 111 and the opening and closing of the cup channel 131, so that the injection amount can be accurately controlled to prevent the residual electrolyte in the pipeline from flowing into the filling device, thereby improving the consistency of the injection; the inlet channel 111 and the cup channel 131 are selectively connected; thus, only the valve stem 12 is used to control the flow direction of the electrolyte, so as to realize the preparation of the first cup body 13 and the replenishment of the second cup body 14, thereby eliminating the valve controlled during the external electrolyte transmission and simplifying the structure.

[0045] The valve stem 12 is provided with a blocking structure for blocking the inlet channel 111. The blocking structure can have various structural forms, and its specific structural forms are described in detail below.

[0046] The valve stem 12 selectively blocks the inlet channel 111 and the cup channel 131. When the inlet channel 111 is blocked, the cup channel 131 is in a conducting state; when the inlet channel 111 is conducting, the cup channel 131 is in a conducting state; and either the inlet channel 111 or the cup channel 131 is selectively conducted, thereby switching the working state of the battery liquid filling device 1 of this embodiment.

[0047] When the inlet channel 111 is in the conducting state, the cup channel 131 is in the blocking state. At this time, the electrolyte can be transported from the liquid storage device 2 to the first cup 13 and will not be further transferred from the first cup 13 to the second cup 14 to complete the liquid preparation.

[0048] Among them, when the inlet channel 111 is in a blocked state, the cup body channel 131 is in a conducting state. At this time, the electrolyte can be transferred from the first cup body 13 to the second cup body 14 to replenish the battery 4. In addition, since the inlet channel 111 is in a blocked state, the electrolyte in the liquid storage device 2 is prevented from flowing into the first cup body 13 again, ensuring that the second cup body 14 is used to replenish the battery 4 accurately.

[0049] In this embodiment, the first cup body 13 and the second cup body 14 can be made of materials resistant to electrolyte corrosion, such as PP, PTFE, stainless steel, etc.

[0050] In this embodiment, the valve stem 12 is made of stainless steel or ceramic.

[0051] In this embodiment, since the discharge port 15 formed at the bottom of the second cup body 14 needs to be aligned with the injection hole of the battery 4 so as to facilitate the injection of the electrolyte in the second cup body 14 into the battery 4, in order to ensure the sealing effect and prevent the electrolyte from flowing out from the contact gap between the discharge port 15 and the injection hole, a sealing gasket can also be provided at the discharge port 15 to improve the sealing effect.

[0052] In addition, the liquid storage device 2 is connected to an air path, so that the liquid storage device 2 can achieve alternation between vacuum and normal pressure during the liquid preparation stage; by controlling the alternation of positive and negative pressures of the liquid storage device 2, the electrolyte fills the first cup body 13 under the action of pressure, thereby improving the injection efficiency of the electrolyte and avoiding residual electrolyte in the liquid storage device 2.

[0053] In some embodiments, a first partition plate 11 is disposed above the first cup body 13, and an inlet channel 111 is disposed on the first partition plate 11; a second partition plate 17 is disposed between the first cup body 13 and the second cup body 14, and a cup body channel 131 is disposed on the second partition plate 17; the valve stem 12 is inserted into the first partition plate 11 and is located at one end of the inlet channel 111, and the valve stem is simultaneously inserted into the cup body channel 131. A first groove portion 121 is disposed on the side wall of the valve stem 12, and the first groove portion 121 is suitable for conducting or blocking the inlet channel 111, and a second groove portion 122 is also disposed on the side wall of the valve stem 12, and the second groove portion 122 is suitable for conducting or blocking the cup body channel 131.

[0054] A first partition plate 11 is disposed above the first cup body 13, an inlet channel 111 is disposed on the first partition plate 11, and a valve stem hole suitable for the valve stem 12 to pass through is also provided on the first partition plate 11. The inlet channel 111 extends from the side of the first partition plate 11 parallel to the plane where the first partition plate 11 is located, and the valve stem hole extends perpendicular to the plane where the first partition plate 11 is located, and the inlet channel 111 is connected to the valve stem hole.

[0055] Combination Figures 2 to 3As shown, the first groove portion 121 is formed by a partial depression of the valve stem 12 in the radial direction; in the blocked state, the valve stem 12 is located at the upper end or the lower end of the first groove portion 121 along the axial direction and is suitable for blocking the inlet channel 111. Since the valve stem 12 and the valve stem hole are transitionally matched or interference matched, the valve stem 12 can block the valve stem hole, thereby making the inlet channel 111 and the first cup body 13 unable to conduct, thereby achieving blocking. In the conducting state, the first groove portion 121 is suitable for connecting the inlet channel 111 and the first cup body 13, and the electrolyte can flow into the first cup body 13 through the inlet channel 111.

[0056] The second groove portion 122 is formed by a local depression of the valve stem 12 in the radial direction; in the blocked state, the upper end or lower end of the valve stem 12 located in the axial direction of the second groove portion 122 is suitable for blocking the cup body channel 131, and in the conducting state, the second groove portion 122 is suitable for connecting the first cup body 13 and the second cup body 14; when the depressed area formed by the second groove portion 122 is aligned with the second partition plate 17, the first cup body 13 and the second cup body 14 are connected, and the electrolyte can flow into the second cup body 14 through the cup body channel 131. When the area of ​​the valve stem 12 located in the upper end or lower end of the second groove portion 122 in the axial direction is aligned with the second partition plate 17, due to the transition fit or interference fit between the valve stem 12 and the cup body channel 131, the valve stem 12 can block the cup body channel 131, thereby preventing the first cup body 13 and the second cup body 14 from conducting, thereby achieving blocking.

[0057] In this embodiment, the cup body channel 131 coincides with the axis of the valve stem 12 , and the valve stem 12 and the cup body channel 131 are in transition fit or interference fit.

[0058] When the liquid storage device 2 needs to inject liquid into the first cup body 13, the first groove portion 121 conducts the inlet channel 111, and the second groove portion 122 blocks the cup body channel 131. When the electrolyte in the first cup body 13 needs to enter the second cup body 14, the first groove portion 121 blocks the inlet channel 111, and the second groove portion 122 conducts the cup body channel 131.

[0059] In some embodiments, along the height direction of the valve stem 12 , the distance from the lower surface of the first groove portion 121 to the upper surface of the second groove portion 122 is L, and the height of the first cup body 13 is D, satisfying: L>D.

[0060] In this embodiment, the distance L from the lower surface of the first groove portion 121 to the upper surface of the second groove portion 122 needs to be greater than the height D of the first cup body 13, otherwise when switching between blocking and connecting the two channels, it is impossible to select one of the inlet channel 111 and the cup body channel 131 to be connected.

[0061] In this embodiment, the height D of the first cup body 13 specifically refers to: the distance between the first partition plate 11 and the second partition plate 17 along the height direction of the valve stem 12 .

[0062] In this embodiment, the first partition plate 11 and the second partition plate 17 are arranged in parallel.

[0063] In some embodiments, the range of L / D satisfies: 0.7≤L / D≤0.9.

[0064] The L / D ratio needs to be limited to a certain range. When the L / D ratio is too large, the valve stem 12 will block both the inlet channel 111 and the cup channel 131, making it impossible to selectively connect the inlet channel 111 and the cup channel 131. When the L / D ratio is too small, the inlet channel 111 and the cup channel 131 will be connected at the same time.

[0065] In some embodiments, an extending direction of the inlet channel 111 is perpendicular to an extending direction of the valve stem 12 .

[0066] By arranging the extension direction of the inlet channel 111 to be perpendicular to the extension direction of the valve stem 12, the inlet channel 111 can be in a horizontal state, the electrolyte will not fall straight down, and the risk of the electrolyte falling straight down is reduced.

[0067] In some embodiments, in combination Figure 2 As shown, the depression depth of the first groove portion 121 along the radial direction is H1, and the aperture of the inlet channel 111 is H2, satisfying: H1>H2.

[0068] In order to prevent excessive liquid from remaining after the injection is completed, the aperture cross-sectional area of ​​the inlet channel 111 should be minimized to avoid residual electrolyte in the injection pipeline, which may lead to inaccurate electrolyte volume in the measuring cup. This facilitates unified control of the injection volume of each battery and ensures the consistency of battery injection.

[0069] At the same time, in order to speed up the liquid replenishment of the first cup body 13, the depression depth H1 of the first groove portion 121 along the radial direction should be larger, thereby improving the liquid replenishment efficiency.

[0070] In some embodiments, the range of H1 / H2 satisfies: 1.2≤H1 / H2≤1.5.

[0071] When the ratio of H1 / H2 is too large, the cross-sectional area of ​​the inlet channel 111 is too small, which will cause the liquid inlet rate to be too slow and affect the liquid inlet efficiency; when the ratio of H1 / H2 is too small, the depression depth of the first groove portion 121 along the radial direction is too small, affecting the efficiency of injecting the electrolyte into the first cup body.

[0072] In some embodiments, along the height direction of the valve stem 12 , the height of the first groove portion 121 is greater than the height of the second groove portion 122 .

[0073] Since the purpose of the first groove 121 is to replenish liquid from the outside and the first cup body 13 has a quantitative function, the first groove 121 should be shorter to facilitate accurate control of the liquid flow rate; and the second groove 122 is used to inject the already quantitative electrolyte into the second cup body 14. In order to improve the injection efficiency, the liquid injection should be accelerated, so the height of the second groove 122 should be higher.

[0074] In some embodiments, the blocking structure comprises:

[0075] A first flow blocking portion 123, wherein the width of the first flow blocking portion 123 in the radial direction is greater than the width of the valve stem 12; the first flow blocking portion 123 is suitable for conducting or blocking the inlet channel 111;

[0076] A second flow blocking portion 124, wherein the width of the second flow blocking portion 124 in the radial direction is greater than the width of the valve stem 12; the second flow blocking portion 124 is suitable for conducting or blocking the cup body channel 131;

[0077] A first partition plate 11 is arranged above the first cup body 13 , and an inlet channel 111 is arranged on the first partition plate 11 ; a second partition plate 17 is arranged between the first cup body 13 and the second cup body 14 , and a cup channel 131 is arranged on the second partition plate 17 ; the valve stem 12 is inserted into the first partition plate 11 and is located at one end of the inlet channel 111 .

[0078] The first flow blocking portion 123 is formed by a partial protrusion of the valve stem 12 along the radial direction; in the present embodiment, it can specifically be a sealing plug structure sleeved on the outer peripheral side of the valve stem 12 .

[0079] In the blocking state, the first flow blocking portion 123 is suitable for blocking the inlet channel 111; in the conducting state, the first flow blocking portion 123 makes way for the conduction between the inlet channel 111 and the first cup body 13. By making the first flow blocking portion 123 abut against the end surface of the first partition plate 11 facing the first cup body 13, the first flow blocking portion 123 can block the inlet channel 111. When the first flow blocking portion 123 is spaced from the first partition plate 11, the first flow blocking portion 123 can make way for the inlet channel 111, thereby achieving conduction between the inlet channel 111 and the first cup body 13.

[0080] The second flow blocking portion 124 is formed by a partial protrusion of the valve stem 12 along the radial direction; in the present embodiment, it can specifically be a sealing plug structure sleeved on the outer peripheral side of the valve stem 12 .

[0081] In the blocking state, the second flow blocking portion 124 is suitable for blocking the cup body channel 131; in the conducting state, the second flow blocking portion 124 makes way for the conduction between the first cup body 13 and the second cup body 14. By making the second flow blocking portion 124 abut against the cup body channel 131, the second flow blocking portion 124 can block the cup body channel 131. When the second flow blocking portion 124 and the cup body channel 131 are spaced apart, the second flow blocking portion 124 can make way for the cup body channel 131, thereby achieving conduction between the first cup body 13 and the second cup body 14.

[0082] By arranging the first flow blocking portion 123 and the second flow blocking portion 124 on the valve stem 12, it can be achieved that when the first cup body 13 is filled with liquid, the second flow blocking portion 124 blocks the cup body channel 131, and the first flow blocking portion 123 conducts the inlet channel 111; and when the second cup body 14 is filled with liquid, the first flow blocking portion 123 blocks the inlet channel 111, and the second flow blocking portion 124 conducts the cup body channel 131.

[0083] In some embodiments, the first flow blocking portion 123 and the second flow blocking portion 124 are both elastic members, and the compression amount of the first flow blocking portion 123 and the second flow blocking portion 124 ranges from 10% to 30%.

[0084] In this embodiment, the first flow blocking portion 123 uses EPDM rubber or fluororubber as a sealing material.

[0085] In this embodiment, the second flow blocking portion 124 uses EPDM rubber or fluororubber as a sealing material.

[0086] By adopting the elastic member, the passage can be better blocked by utilizing elastic compression, while scratching of the valve stem caused by movement of the flow blocking part can be avoided.

[0087] In some embodiments, along the height direction of the valve stem 12 , the first flow blocking portion 123 and / or the second flow blocking portion 124 is configured as a structure that is wide at the top and narrow at the bottom.

[0088] The structure of being wide at the top and narrow at the bottom can ensure that the flow blocking part is tightly pressed against the channel, thus achieving a better sealing effect.

[0089] In some embodiments, along the height direction of the valve stem 12, the height of the first flow blocking portion 123 is D1, the distance between the first flow blocking portion 123 and the second flow blocking portion 124 is D2, the height of the second flow blocking portion 124 is D3, and the height of the first cup body 13 is D, satisfying: D1+D2+D3δD.

[0090] The sum of the heights of D1+D2+D3 should be less than or equal to the height D of the first cup body 13, which can ensure the mobility of the valve stem 12 in the height direction to achieve the switching between blocking and conducting of the cup body channel 131 and the inlet channel 111.

[0091] In some embodiments, when D1+D2+D3=D, at least one of the first blocking portion 123 and the second blocking portion 124 is adapted to move relative to the valve stem 12 .

[0092] When D1+D2+D3=D, the valve stem 12 is locked in the height direction. By making at least one of the first flow blocking portion 123 and the second flow blocking portion 124 suitable for moving relative to the valve stem 12, the distance between the two flow blocking portions can be adjusted to achieve the switching between blocking and conducting of the cup body channel and the inlet channel.

[0093] In some embodiments, when D1+D2+D3<D, the value range of the aperture H2 of the inlet channel 111 is: 4mm≤H2≤8mm.

[0094] When D1+D2+D3<D, the cup body channel 131 is also opened at the moment when the first flow blocking part 123 opens the inlet channel 111. Therefore, the aperture H2 of the inlet channel 111 is set smaller, thereby reducing the cross-sectional area of ​​the inlet channel 111. It will not happen that a large amount of liquid enters the first cup body 13 instantly, while part of the liquid has already flowed into the second cup body 14, thereby ensuring the accuracy of the amount of electrolyte in the measuring cup and improving the consistency of liquid injection.

[0095] In some embodiments, the aperture of the cup body channel 131 is H3, satisfying: 0.7≤H2 / H3≤0.9. If the aperture H2 of the inlet channel 111 is too small, the liquid inflow is too slow, which affects the injection efficiency. If the ratio is too large, the aperture of the inlet channel 111 is large, and a large amount of electrolyte will enter the first cup body at the moment of opening, so that part of the liquid will flow into the second cup body 14, affecting the accuracy of the quantitative measurement of the measuring cup.

[0096] In some embodiments, a first partition plate 11 is disposed above the first cup body 13, and an inlet channel 111 is disposed on the first partition plate 11; a second partition plate 17 is disposed between the first cup body 13 and the second cup body 14, and a cup channel 131 is disposed on the second partition plate 17; the valve stem 12 is inserted into the first partition plate 11 and is located at one end of the inlet channel 111;

[0097] A first groove portion 121 is provided on the side wall of the valve stem 12, and the first groove portion 121 is suitable for opening or blocking the inlet channel 111;

[0098] A second flow blocking portion 124 is also provided on the valve stem 12 . The radial width of the second flow blocking portion 124 is greater than the width of the valve stem 12 . The second flow blocking portion 124 is suitable for conducting or blocking the cup body channel 131 .

[0099] By simultaneously arranging the first groove portion 121 and the second flow blocking portion 124 on the valve stem 12, it is possible to achieve that when the first cup body 13 is filled with liquid, the second flow blocking portion 124 blocks the cup body channel 131, and at the same time the first groove portion 121 is connected to the inlet channel 111; and when the second cup body 14 is filled with liquid, the first groove portion 121 blocks the inlet channel 111, and at the same time the second flow blocking portion 124 is connected to the cup body channel 131.

[0100] In some embodiments, the height ratio of the first cup body 13 to the second cup body 14 ranges from 0.05 to 0.4.

[0101] In this embodiment, the height of the second cup body 14 refers to the height difference between the lower surface of the second partition plate 17 and the lowest point of the liquid storage space of the second cup body 14 .

[0102] In this embodiment, it is necessary to ensure that the height of the second cup body 14 is higher than that of the first cup body 13 to ensure that there is sufficient gas space after the second cup body 14 is filled with liquid to prevent the electrolyte gas from being sucked out of the cup body by the vacuum pumping equipment during vacuum pumping.

[0103] In some embodiments, the wetting angle between the valve stem 12 and the electrolyte is greater than 90°.

[0104] The wetting angle reflects the degree of affinity of the valve stem to the electrolyte. By limiting the wetting angle between the valve stem 12 and the electrolyte to be greater than 90°, it is possible to prevent the electrolyte from flowing into the second cup body through the gap between the valve stem 12 and the second partition plate 17. At the same time, the material of the stem is electrolyte-friendly, and the electrolyte sticks to the wall seriously, which affects the injection flow rate of the electrolyte into the cup body. In some embodiments, combined with Figure 1 As shown, the battery liquid filling device is also formed with an air source channel 132 , and the air source channel 132 is suitable for connecting the second cup body 14 with the air source device 3 .

[0105] In this embodiment, the air source channel 132 is formed on the partition plate between the first cup body 13 and the second cup body 14. By setting the air source channel 132, the second cup body 14 is connected to the air source device 3, so that the air source device 3 provides the second cup body 14 with alternating air pressure. By alternating positive and negative pressures, the effective volume of the second cup body 14 can be increased, and the efficiency of injecting liquid from the second cup body 14 into the battery 4 can be improved, effectively ensuring that the electrode inside the battery 4 is fully infiltrated with the electrolyte, thereby facilitating the injection operation.

[0106] In some embodiments, in combination Figure 1 As shown, the battery liquid filling device further includes: a shielding portion 16 disposed in the second cup body 14 and located between the air source channel 132 and the cup body channel 131 .

[0107] In this embodiment, the opening of the gas source channel 132 and the opening of the cup body channel 131 are both located on the partition plate, and the distance between the two is close. By forming a shielding portion 16 between the gas source channel 132 and the cup body channel 131, the electrolyte can be prevented from being discharged with the vacuum airflow, thereby playing a blocking role and avoiding the loss of electrolyte.

[0108] In some embodiments, the battery liquid injection device further includes: a driving mechanism, which is suitable for driving the valve stem 12 to move along the axial direction. The driving mechanism can be a cylinder or a linear motor.

[0109] Since the valve stem 12 of the present invention has various implementation forms, for example, the valve stem 12 has a first groove portion 121 and a second groove portion 122, another example is the valve stem 12 has a first flow blocking portion 123 and a second flow blocking portion 124, another example is the valve stem 12 has a first groove portion 121 and a second flow blocking portion 124, etc. The following takes the valve stem 12 having the first groove portion 121 and the second groove portion 122 as an example to describe in detail the specific working process of the battery liquid injection device provided by the embodiment of the present invention:

[0110] The first step is to prepare the liquid: when the formation step starts, the valve stem 12 is moved to make the first groove 121 conduct the inlet channel 111, and the second groove 122 blocks the cup channel 131, so that the electrolyte 100 flows from the liquid storage device 2 into the first cup 13. After a specified time, it is ensured that the electrolyte 100 in the first cup 13 reaches a predetermined volume, and the liquid preparation is completed;

[0111] The second step is to replenish the liquid: after the first stage of formation charging is completed, the valve stem 12 is moved to make the first groove portion 121 block the inlet channel 111, and the second groove portion 122 is connected to the cup body channel 131, so that the first cup body 13 is connected to the second cup body 14, and at the same time, the gas source device 3 is turned on to a negative pressure state, and the electrolyte 100 in the first cup body 13 is transferred to the second cup body 14 by the negative pressure. After a specified time, it is ensured that the electrolyte 100 in the first cup body 13 is completely transferred to the second cup body 14, and then the valve stem 12 is moved to make the second groove portion 122 block the cup body channel 131, and the connection between the first cup body 13 and the second cup body 14 is closed, and the replenishment is completed;

[0112] The third step is absorption: in the remaining steps of the formation, the gas source is alternately set to normal pressure / vacuum state to absorb the electrolyte 100 in the second cup body 14 into the battery 4.

[0113] According to an embodiment of the present invention, on the other hand, a formation device is provided, including: the battery liquid injection device as described above.

[0114] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the present invention.

Claims

1. A battery filling device, characterized in that: include: A first cup body (13) and a second cup body (14), wherein the first cup body (13) and the second cup body (14) are connected via a cup body channel (131); An inlet channel (111) adapted to connect the first cup body (13) with the liquid storage device (2); The valve stem (12) is adapted to move along the height direction of the first cup body (13) to selectively block the inlet channel (111) and the cup body channel (131); when the inlet channel (111) is blocked, the cup body channel (131) is in a conducting state; when the inlet channel (111) is conducting, the cup body channel (131) is in a blocked state; The valve stem (12) is provided with a blocking structure for blocking the inlet channel (111); A first partition plate (11) is arranged above the first cup body (13), and the inlet channel (111) is arranged on the first partition plate (11); a second partition plate (17) is arranged between the first cup body (13) and the second cup body (14), and the cup channel (131) is arranged on the second partition plate (17); the valve stem (12) is inserted into the first partition plate (11) and is located at one end of the inlet channel (111), and the valve stem (12) is inserted into the cup channel (131); a first groove portion (121) is arranged on the side wall of the valve stem (12), and the first groove portion (121) is suitable for conducting or blocking the inlet channel (111); a second groove portion (122) is also arranged on the side wall of the valve stem (12), and the second groove portion (122) is suitable for conducting or blocking the cup channel (131); The extending direction of the inlet channel (111) is perpendicular to the extending direction of the valve stem (12).

2. The battery liquid injection device according to claim 1, characterized in that: Along the height direction of the valve stem (12), the distance from the lower surface of the first groove portion (121) to the upper surface of the second groove portion (122) is L, and the height of the first cup body (13) is D, satisfying: L>D.

3. The battery liquid filling device according to claim 2, characterized in that: The range of L / D satisfies: 1.1≤L / D≤1.

4.

4. The battery liquid injection device according to claim 1, characterized in that: The recessed depth of the first groove portion (121) in the radial direction is H1, and the aperture of the inlet channel (111) is H2, satisfying: H1>H2.

5. The battery liquid filling device according to claim 4, characterized in that: The range of H1 / H2 satisfies: 1.2≤H1 / H2≤1.

5.

6. The battery liquid injection device according to claim 1, characterized in that: Along the height direction of the valve stem (12), the height of the first groove portion (121) is greater than the height of the second groove portion (122).

7. The battery liquid injection device according to claim 1, characterized in that: The height ratio of the first cup body (13) to the second cup body (14) ranges from 0.05 to 0.

4.

8. The battery liquid filling device according to claim 1, characterized in that: The wetting angle between the valve stem (12) and the electrolyte is greater than 90°.

9. The battery liquid filling device according to claim 1, characterized in that: The battery liquid injection device is also formed with an air source channel (132), and the air source channel (132) is suitable for connecting the second cup body (14) with the air source device (3).

10. The battery liquid filling device according to claim 9, characterized in that: The battery liquid injection device further comprises: a shielding portion (16) disposed in the second cup body (14) and located between the gas source channel (132) and the cup body channel (131).

11. The battery liquid filling device according to any one of claims 1 to 10, characterized in that: The battery liquid injection device further comprises a driving mechanism, wherein the driving mechanism is suitable for driving the valve stem (12) to move along an axial direction.

12. A chemical formation device, characterized in that: The invention comprises a battery liquid filling device as claimed in any one of claims 1 to 11.

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