Formation liquid collecting device and battery manufacturing equipment

Abstract

The utility model discloses a formation liquid collecting device and battery manufacturing equipment. The formation liquid collecting device comprises a formation cup and a collecting pipe, the formation cup is provided with a containing cavity and comprises an inlet and an outlet, and the outlet is used for being connected with a negative pressure device. One end of the collecting pipe is connected with the liquid injection port of the battery monomer, and the other end of the collecting pipe is connected to the inlet. Wherein a liquid collecting part is arranged at the position, opposite to the outlet, of the formation cup, and the pipe end of the collecting pipe is arranged between the liquid collecting part and the outlet. In the accommodating cavity of the formation cup, the outlet is opposite to the liquid collecting part, gas can be discharged from the outlet in time, liquid can flow to the liquid collecting part due to gravity, gas-liquid separation is realized, the gathered electrolyte can be injected into the battery monomer again, and the loss of the electrolyte is reduced. And moreover, the collecting pipe is arranged between the liquid collecting part and the outlet, so that blockage caused by electrolyte crystallization at the inlet can be reduced, and the formation efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of battery manufacturing equipment, and in particular to a formation liquid collecting device and battery manufacturing equipment. Background Art

[0002] As the market's requirements for battery life become higher and higher, the energy density and efficiency of batteries are also gradually increasing. During the production process of battery cells, formation is required to improve the efficiency of battery cells.

[0003] However, the formation process will inevitably lead to the loss of electrolyte in the battery cells. Therefore, how to reduce the loss of electrolyte in the battery cells during the formation process is also one of the research issues. Utility Model Content

[0004] In view of the above problems, the present application provides a formation liquid collecting device and a battery manufacturing equipment, which can reduce the loss of electrolyte in the formation process, reduce the blockage of electrolyte crystallization at the inlet, and improve the formation efficiency.

[0005] In a first aspect, the present application provides a formation liquid collection device, comprising a formation cup and a collecting tube. The formation cup has a accommodating cavity, and the formation cup includes an inlet and an outlet, and the outlet is used to connect a negative pressure device. One end of the collecting tube is used to connect to the liquid injection port of the battery cell, and the other end of the collecting tube is connected to the inlet. A liquid collecting portion is provided on the formation cup at a position opposite to the outlet, and the tube end of the collecting tube is provided between the liquid collecting portion and the outlet.

[0006] In the technical solution of the embodiment of the present application, a formation cup is provided to collect the gas generated during the formation process and the electrolyte extracted by the negative pressure mechanism. In the accommodating chamber of the formation cup, the outlet and the liquid collecting part are arranged opposite to each other, the gas can be discharged from the outlet in time, and the liquid can flow to the liquid collecting part due to gravity to achieve gas-liquid separation, and the collected electrolyte can be injected into the battery cell again to reduce the loss of the electrolyte. In addition, the collection tube is arranged between the liquid collecting part and the outlet, which can reduce the blockage caused by the crystallization of the electrolyte at the inlet and improve the formation efficiency.

[0007] In some embodiments, the formation cup includes a bottom wall disposed opposite to the outlet, and the bottom wall is concave to form a liquid collecting portion. In the above structure, the flow direction of the electrolyte is guided by the concave bottom wall, thereby improving the efficiency of electrolyte collection.

[0008] In some embodiments, a liquid-repellent layer is provided on the side of the formation cup facing the receiving cavity, and the liquid-repellent layer is used to guide the electrolyte to the liquid collecting part. In the above technical solution, by providing the liquid-repellent layer, the amount of electrolyte attached to the inner wall of the formation cup is reduced, and the collection efficiency of the electrolyte is improved.

[0009] In some embodiments, the liquid-repellent layer includes a silicon dioxide coating. In the above structure, the silicon dioxide coating has a good liquid collection effect, and the raw materials are easy to obtain and the manufacturing efficiency is high.

[0010] In some embodiments, the outlet is arranged opposite to the inlet, and the end of the collecting tube extends from the inlet into the accommodating cavity and protrudes from the inner wall of the formation cup. In the above technical solution, the collecting tube is connected from the inlet and extends into the accommodating cavity, and a space for collecting electrolyte is formed between the collecting tube and the inner wall of the formation cup, which can facilitate the electrode liquid to flow back from the collecting tube to the formation cup, reduce the blockage caused by the crystallization of the electrolyte at the inlet of the formation cup, improve the electrolyte collection efficiency, and improve the formation efficiency.

[0011] In some embodiments, the formation cup further comprises a side wall and a top wall, the top wall is arranged opposite to the bottom wall, the side wall is arranged between the top wall and the bottom wall, the outlet is arranged on the top wall, and the inlet is arranged on the side wall. In the above technical solution, the collecting tube is connected to the side wall of the formation cup, and a liquid collecting portion for collecting electrolyte can be formed at the bottom wall, which can facilitate the electrolyte in the collecting tube to flow back to the bottom wall, thereby improving the electrolyte collection efficiency.

[0012] In some embodiments, the liquid collecting part is provided with a drain port, and the formation liquid collecting device further comprises a drain pipe, one end of which is connected to the drain port. In the above technical solution, by providing the drain pipe, the recovered electrolyte can be injected into the battery cell, thereby reducing the loss of electrolyte and reducing the production cost.

[0013] In some embodiments, the other end of the drain pipe is connected to the collection pipe. In the above technical solution, the other end of the drain pipe is connected to the collection pipe, and the recovered electrolyte is directly injected into the battery cell through the collection pipe, which improves the convenience of electrolyte reinjection and recovery efficiency and simplifies the equipment structure.

[0014] In some embodiments, a control valve is provided on the drain pipe, and the control valve is used to control the on-off of the drain pipe. In the above structure, it is convenient to control the reflux of the electrolyte and improve the recovery efficiency.

[0015] In a second aspect, the present application provides a battery manufacturing device, which includes the formation liquid collection device in the above embodiment.

[0016] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0018] Figure 1 A schematic diagram of the exploded structure of a battery cell provided in one embodiment of the present application;

[0019] Figure 2 A schematic diagram of the structure of a formation liquid collection device provided in one embodiment of the present application;

[0020] Figure 3 A schematic diagram of the structure of a formation liquid collection device provided in another embodiment of the present application;

[0021] Figure 4 A schematic structural diagram of a formation liquid collecting device provided in yet another embodiment of the present application;

[0022] Figure 5 It is a schematic diagram of the structure of the formation liquid collection device in the comparative example of the present application.

[0023] DETAILED DESCRIPTION OF REFERENCE NUMERALS

[0024] 1. Formation liquid collecting device; 101. Formation cup; 102. Collecting tube; 103. Accommodating chamber; 104. Inlet; 105. Outlet; 106. Exhaust pipe; 107. Bottom wall; 108. Liquid collecting part; 109. Side wall; 110. Top wall; 111. Liquid discharge port; 112. Liquid discharge pipe; 113. Control valve; 2. Battery cell; 10. Electrode assembly; 20. Shell; 21. Liquid injection hole; 30. End cover assembly; 40. Outer shell. DETAILED DESCRIPTION

[0025] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0027] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0028] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0029] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0030] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0031] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0032] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0033] Please refer to Figure 1 , Figure 1 The schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application. The battery cell 2 refers to the smallest unit constituting the battery 2. As shown in the figure, the battery cell 2 includes a housing 40, an electrode assembly 10 and other functional components.

[0034] The housing 40 includes an end cap assembly 30 and a shell 20. The end cap assembly 30 refers to a component that covers the opening 21 of the shell 20 to isolate the internal environment of the battery cell 2 from the external environment. Without limitation, the shape of the end cap assembly 30 can be adapted to the shape of the shell 20 to match the shell 20. Optionally, the end cap assembly 30 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap assembly 30 is not easily deformed when it is squeezed and collided, so that the battery cell 2 can have a higher structural strength and the safety performance can also be improved.

[0035] In some embodiments, the material of the end cap assembly 30 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiments of the present application. In some embodiments, an insulating component may be provided inside the end cap assembly 30, and the insulating component may be used to isolate the electrical connection components in the housing 20 from the end cap assembly 30 to reduce the risk of short circuit. Exemplarily, the insulating component may be plastic, rubber, etc.

[0036] The housing 20 is a component used to cooperate with the end cap assembly 30 to form an internal environment of the battery cell 2. The formed internal environment can be used to accommodate the electrode assembly 10, electrolyte and other components.

[0037] The electrode assembly 10 is a component in the battery cell 2 where electrochemical reactions occur. One or more electrode assemblies 10 may be contained in the housing 20. The electrode assembly 10 includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell 2, active ions (such as lithium ions) are embedded and removed back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow active ions to pass through. In some embodiments, the electrode assembly 10 also includes a separator, which is arranged between the positive electrode and the negative electrode.

[0038] In some embodiments, the battery cell 2 further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The present application does not specifically limit the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid, and a liquid electrolyte is generally referred to as an electrolyte.

[0039] In some embodiments, the end cap assembly 30 is provided with a liquid injection hole 21 for injecting electrolyte into the housing 40. After the liquid injection is completed, the liquid injection hole 21 can be blocked to ensure the stability of the environment inside the housing 40.

[0040] In the production process of the battery, after the components in the battery cell 2 are installed, a formation process needs to be carried out to form a solid electrolyte interface film on the surface of the electrode pole piece, referred to as SEI film (solid electrolyte interphase film layer). In order to form a complete SEI film, it is necessary to charge the battery cell with a small current, and this step is called formation film forming. During the formation process, gas will be produced, and these gases will have a negative impact on the formation speed. If these gases are left inside the battery cell, lithium precipitation will also occur during the use of the battery cell. In order to timely discharge the gas generated during the formation film to improve the formation efficiency, it is necessary to keep the battery cell inside a high temperature negative pressure environment during the battery cell formation process. Therefore, a negative pressure mechanism will be connected to the injection hole of the battery cell to absorb gas in time to prevent pores from appearing inside the shell, causing the pole piece surface to be incompletely formed, and black spots and lithium precipitation will occur.

[0041] In a high temperature and negative pressure environment, the electrolyte in the battery cell will be partially drawn away by the negative pressure mechanism, resulting in electrolyte loss. In addition, the boiling point of the electrolyte will change with the negative pressure, and it will turn into a gaseous state during the formation process. As the gas generated by the formation is drawn out, further electrolyte loss will occur.

[0042] Based on the above problems, the embodiments of the present application have improved the formation device. The formation liquid collecting device provided in the embodiments of the present application is provided with a formation cup to collect the gas generated during the formation process and the electrolyte extracted by the negative pressure mechanism. In the accommodating chamber of the formation cup, the outlet and the liquid collecting part are arranged relative to each other, the gas can be discharged from the outlet in time, and the liquid can flow to the liquid collecting part due to gravity, thereby achieving gas-liquid separation. The collected electrolyte can be injected into the battery cell again to reduce the loss of the electrolyte. In addition, the collecting tube is arranged between the liquid collecting part and the outlet, which can reduce the blockage caused by the crystallization of the electrolyte at the inlet and improve the formation efficiency.

[0043] The following is a detailed description of the liquid collection device provided by the present application in conjunction with the accompanying drawings. Figures 2 to 4 , Figure 2 A schematic diagram of the structure of a formation liquid collection device provided in one embodiment of the present application. Figure 3 A schematic structural diagram of a formation liquid collection device provided in another embodiment of the present application. Figure 4 A schematic structural diagram of a formation liquid collection device provided in yet another embodiment of the present application.

[0044] As shown in the figure, the present application provides a formation liquid collection device 1, including a formation cup 101 and a collecting tube 102. The formation cup 101 has a accommodating cavity 103, and the formation cup 101 includes an inlet 104 and an outlet 105, and the outlet 105 is used to connect a negative pressure device. One end of the collecting tube 102 is used to connect to the liquid injection port of the battery cell 2, and the other end of the collecting tube 102 is connected to the inlet 104. Among them, a liquid collection part 108 is provided on the formation cup 101 at a position opposite to the outlet 105, and the tube end of the collecting tube 102 is arranged between the liquid collection part 108 and the outlet 105.

[0045] Exemplarily, the formation cup 101 can be arranged between the battery cell 2 and the negative pressure mechanism to discharge the gas-liquid mixture in the formation process from the housing 20. The formation cup 101 can be made of an alloy or an organic material with a certain structural strength, and has the properties of corrosion resistance and high temperature resistance. The formation liquid collecting device 1 can also include an exhaust pipe 106, one end of the exhaust pipe 106 is connected to the outlet 105, and the other end is connected to the negative pressure mechanism. The gas in the formation cup 101 can be discharged from the exhaust pipe 106.

[0046] In the technical solution of the embodiment of the present application, the gas generated during the formation process and the negative pressure mechanism are extracted and collected by setting a formation cup 101. In the accommodating chamber 103 of the formation cup 101, the outlet 105 and the liquid collecting part 108 are arranged opposite to each other, the gas can be discharged from the outlet 105 in time, and the liquid can flow to the liquid collecting part 108 due to gravity to achieve gas-liquid separation, and the collected electrolyte can be injected into the battery cell 2 again to reduce the loss of the electrolyte. In addition, the collection tube 102 is arranged between the liquid collecting part 108 and the outlet 105, which can reduce the blockage caused by the crystallization of the electrolyte at the inlet 104 and improve the formation efficiency.

[0047] In some embodiments of the present application, the formation cup 101 includes a bottom wall 107 disposed opposite to the outlet 105, and the bottom wall 107 is concave to form a liquid collecting portion 108. In the above structure, the concave bottom wall 107 guides the flow direction of the electrolyte, thereby improving the efficiency of electrolyte collection.

[0048] In some embodiments of the present application, a lyophobic layer is provided on one side of the formation cup 101 facing the accommodating cavity 103, and the lyophobic layer is used to guide the electrolyte to the liquid collecting portion 108. In the above technical solution, by providing the lyophobic layer, the amount of electrolyte attached to the inner wall of the formation cup 101 is reduced, and the collection efficiency of the electrolyte is improved.

[0049] In some embodiments of the present application, the liquid-repellent layer includes a silicon dioxide coating. In the above structure, the silicon dioxide coating has a good liquid collection effect, and the raw materials are easy to obtain and the manufacturing efficiency is high.

[0050] In some embodiments of the present application, the outlet 105 is arranged opposite to the inlet 104, the end of the collecting tube 102 extends from the inlet 104 into the accommodating chamber 103, and the end of the collecting tube 102 protrudes from the inner wall of the formation cup 101. The above technical solution connects the collecting tube 102 from the inlet 104 and extends into the accommodating chamber 103, and a space for collecting electrolyte is formed between the collecting tube 102 and the inner wall of the formation cup 101, which can facilitate the electrode liquid to flow back from the collecting tube 102 to the formation cup 101, reduce the blockage caused by the crystallization of the electrolyte at the inlet 104 of the formation cup 101, improve the electrolyte collection efficiency, and improve the formation efficiency.

[0051] like Figure 3 As shown, in some embodiments of the present application, the formation cup 101 also includes a side wall 109 and a top wall 110 , the top wall 110 is arranged opposite to the bottom wall 107 , the side wall 109 is arranged between the top wall 110 and the bottom wall 107 , the outlet 105 is arranged on the top wall 110 , and the inlet 104 is arranged on the side wall 109 .

[0052] In the above technical solution, the collecting tube 102 is connected to the side wall 109 of the formation cup 101, and a liquid collecting portion 108 for collecting electrolyte can be formed at the bottom wall 107, so that the electrolyte in the collecting tube 102 can flow back to the bottom wall 107, thereby improving the electrolyte collection efficiency.

[0053] like Figure 4 As shown, in some embodiments of the present application, a drain port 111 is provided on the liquid collecting portion 108, and the formation liquid collecting device 1 further includes a drain pipe 112, one end of which is connected to the drain port 111. In the above technical solution, by providing the drain pipe 112, the recovered electrolyte can be injected into the battery cell 2, thereby reducing the loss of the electrolyte and reducing the production cost.

[0054] In some embodiments of the present application, the other end of the drain pipe 112 is connected to the collecting pipe 102. In the above technical solution, the other end of the drain pipe 112 is connected to the collecting pipe 102, and the recovered electrolyte is directly injected into the battery cell 2 through the collecting pipe 102, which improves the convenience of electrolyte reinjection and recovery efficiency and simplifies the equipment structure.

[0055] In some embodiments of the present application, a control valve 113 is provided on the drain pipe 112, and the control valve 113 is used to control the on-off of the drain pipe 112. In the above structure, it is convenient to control the reflux of the electrolyte and improve the recovery efficiency.

[0056] In some optional embodiments, the formation cup 101 is made of transparent material, and the state of liquid accumulation in the formation cup 101 can be directly observed. When the liquid accumulates to a certain amount, the control valve 113 can be opened to reflux the electrolyte to improve the recovery efficiency.

[0057] Example 1

[0058] The formation liquid collecting device 1 of the embodiment of the present application includes a formation cup 101 and a collecting tube 102. The formation cup 101 has a accommodating chamber 103, and the formation cup 101 includes an inlet 104 and an outlet 105, and the outlet 105 is used to connect the negative pressure device. One end of the collecting tube 102 is used to connect the liquid injection port of the battery cell 2, and the other end of the collecting tube 102 is connected to the inlet 104. The formation cup 101 includes a bottom wall 107 arranged opposite to the outlet 105, and the bottom wall 107 is concave to form a liquid collecting portion 108. The outlet 105 is arranged opposite to the inlet 104, and the end of the collecting tube 102 extends from the inlet 104 into the accommodating chamber 103 and protrudes from the inner wall of the formation cup 101.

[0059] Example 2

[0060] The formation liquid collecting device 1 of the embodiment of the present application includes a formation cup 101 and a collecting tube 102. The formation cup 101 has a accommodating chamber 103, and the formation cup 101 includes an inlet 104 and an outlet 105, and the outlet 105 is used to connect the negative pressure device. One end of the collecting tube 102 is used to connect the liquid injection port of the battery cell 2, and the other end of the collecting tube 102 is connected to the inlet 104. The formation cup 101 includes a bottom wall 107 arranged opposite to the outlet 105, and the bottom wall 107 is concave to form a liquid collecting portion 108. The formation cup 101 also includes a side wall 109 and a top wall 110, the top wall 110 is arranged opposite to the bottom wall 107, the side wall 109 is arranged between the top wall 110 and the bottom wall 107, the outlet 105 is arranged on the top wall 110, and the inlet 104 is arranged on the side wall 109.

[0061] Example 3

[0062] The formation liquid collecting device 1 of the embodiment of the present application includes a formation cup 101 and a collecting tube 102. The formation cup 101 has a accommodating chamber 103, and the formation cup 101 includes an inlet 104 and an outlet 105, and the outlet 105 is used to connect the negative pressure device. One end of the collecting tube 102 is used to connect the liquid injection port of the battery cell 2, and the other end of the collecting tube 102 is connected to the inlet 104. The formation cup 101 includes a bottom wall 107 arranged opposite to the outlet 105, and the bottom wall 107 is concave to form a liquid collecting portion 108. The formation cup 101 also includes a side wall 109 and a top wall 110, the top wall 110 is arranged opposite to the bottom wall 107, the side wall 109 is arranged between the top wall 110 and the bottom wall 107, the outlet 105 is arranged on the top wall 110, and the inlet 104 is arranged on the side wall 109. The liquid collecting part 108 is provided with a drain port 111, and the formation liquid collecting device 1 further includes a drain pipe 112, one end of which is connected to the drain port 111, and the other end of which is connected to the collecting pipe 102. The drain pipe 112 is provided with a control valve 113, and the control valve 113 is used to control the on and off of the drain pipe 112.

[0063] Comparative Example

[0064] like Figure 5 As shown, the formation liquid collecting device 1 in the comparative example includes a formation cup 101 and a collecting tube 102. The structure thereof is substantially the same as that of Example 1, except that the collecting tube 102 in the comparative example is directly connected to the inlet 104 of the formation cup 101 and does not protrude from the inner wall of the formation cup 101.

[0065] Table 1 Blockage frequency of the formation cup inlet and the proportion of black spots on the surface of the electrode

[0066] Blockage cleaning frequency The proportion of black spots on the surface of the pole piece Comparative Example Once every 20 days 3％ Example 1 Once every 40 days 0.9％ Example 2 Once every 50 days 0.5％ Example 3 Once every 60 days 0.3％

[0067] As shown in the table above, the blockage cleaning frequency indicates the frequency of cleaning required when the formation cup 101 or the collection tube 102 is blocked and completely unable to ventilate. The black spot ratio on the electrode surface refers to the ratio of the black spots on the electrode surface to the entire electrode surface area.

[0068] In the comparative example, the collecting tube 102 is arranged at the inlet 104, and the concentration of the non-volatile solvent and the solute at the inlet 104 is getting higher and higher, and the accumulation is getting higher and higher, and part of it flows back into the collecting tube 102, causing the clogging of the collecting tube 102 and the inlet 104. Therefore, the formation cup 101 of the comparative example needs to be replaced once every 20 days or so, and the replacement frequency is high. At the same time, the proportion of black spots on the surface of the electrode is relatively high, and the electrode electrode yield is low.

[0069] In comparative example 1, the collecting tube 102 extends into the accommodating cavity 103 and protrudes from the inner wall of the formation cup 101, which can reduce the blockage caused by electrolyte crystallization at the inlet 104, so the cleaning frequency is greatly reduced compared with the comparative example. However, some electrolyte crystals in the collecting tube 102 will cause blockage, so it needs to be cleaned about 40 days.

[0070] In comparative example 2, the outlet 105 is provided on the top wall 110, the inlet 104 is provided on the side wall 109, and the collecting tube 102 is connected to the side wall 109, which can reduce the blockage caused by the crystallization of the electrolyte at the inlet 104, so the cleaning frequency is greatly reduced compared with the comparative example. At the same time, the blockage caused by the crystallization of the electrolyte in the collecting tube 102 can be reduced, so the cleaning frequency is also reduced compared with comparative example 1, and the proportion of black spots is reduced.

[0071] In comparative example 3, a drain port 111 and a drain pipe 112 are provided, one end of the drain pipe 112 is connected to the drain port 111, and the other end of the drain pipe 112 is connected to the collecting pipe 102. A control valve 113 is provided on the drain pipe 112, and the control valve 113 is used to control the on and off of the drain pipe 112. Therefore, the above structure can reduce the blockage caused by the crystallization of the electrolyte at the inlet 104, and at the same time, can reduce the blockage caused by the crystallization of the electrolyte in the collecting pipe 102, and can also reflux the electrolyte in time to flush the crystallized part in the collecting pipe 102, further reducing the probability of crystallization of the electrolyte in the collecting pipe 102. The electrolyte can also be quickly refluxed to the battery cell 2, reducing the formation of black spots, reducing electrolyte loss, and improving the utilization efficiency of the electrolyte.

[0072] The embodiment of the present application also provides a battery manufacturing device, which includes the formation liquid collection device 1 in the above embodiment. In the battery manufacturing equipment, the gas generated during the formation process and the negative pressure mechanism are extracted to collect the electrolyte by setting the formation cup 101. In the accommodating chamber 103 of the formation cup 101, the outlet 105 and the liquid collection part 108 are arranged opposite to each other, the gas can be discharged from the outlet 105 in time, and the liquid can flow to the liquid collection part 108 due to gravity to achieve gas-liquid separation, and the collected electrolyte can be injected into the battery cell 2 again to reduce the loss of the electrolyte. In addition, the collection tube 102 is arranged between the liquid collection part 108 and the outlet 105, which can reduce the blockage caused by the crystallization of the electrolyte at the inlet 104 and improve the formation efficiency.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A formation liquid collecting device (1), characterized in that: include: A formation cup (101) having a containing chamber (103), the formation cup (101) comprising an inlet (104) and an outlet (105), the outlet (105) being used to connect to a negative pressure device; A collecting tube (102), one end of which is used to connect to the liquid injection port of the battery cell (2), and the other end of the collecting tube (102) is connected to the inlet (104). Wherein, a liquid collecting portion (108) is provided on the formation cup (101) at a position opposite to the outlet (105), and the tube end of the collection tube (102) is provided between the liquid collecting portion (108) and the outlet (105). The formation cup (101) comprises a bottom wall (107) arranged opposite to the outlet (105), the bottom wall (107) being concave to form the liquid collecting portion (108), the formation cup (101) further comprises a side wall (109) and a top wall (110), the top wall (110) being arranged opposite to the bottom wall (107), the side wall (109) being arranged between the top wall (110) and the bottom wall (107), the outlet (105) being arranged on the top wall (110), The inlet (104) is arranged on the side wall (109); the liquid collecting portion (108) is provided with a liquid discharge port (111); the formation liquid collecting device (1) further comprises a liquid discharge pipe (112); one end of the liquid discharge pipe (112) is connected to the liquid discharge port (111); the other end of the liquid discharge pipe (112) is connected to the collecting pipe (102); a control valve (113) is provided on the liquid discharge pipe (112); the control valve (113) is used to control the on and off of the liquid discharge pipe (112).

2. The formation liquid collecting device (1) according to claim 1, characterized in that: A liquid-repellent layer is provided on one side of the formation cup (101) facing the accommodating chamber (103), and the liquid-repellent layer is used to guide the electrolyte to the liquid collecting portion (108).

3. The formation liquid collecting device (1) according to claim 2, characterized in that: The lyophobic layer includes a silicon dioxide coating.

4. The formation liquid collecting device (1) according to any one of claims 1 to 3, characterized in that: The outlet (105) is arranged opposite to the inlet (104), and the end of the collecting tube (102) extends from the inlet (104) into the containing cavity (103) and protrudes from the inner wall of the formation cup (101).

5. A battery manufacturing device, characterized in that: The battery manufacturing equipment comprises a formation liquid collecting device (1) as claimed in any one of claims 1 to 4.

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