Liquid injection cup, liquid injection mechanism and liquid injection forming equipment

Abstract

The embodiments of the present application relate to the field of liquid injection technology, and disclose a liquid injection cup, a liquid injection mechanism, and a liquid injection formation device. The liquid injection cup includes a cup body, a valve, a sealing member, and a first valve body. The cup body is provided with a first cavity and a second cavity arranged at intervals, and the cup body includes a partition separating the first cavity and the second cavity, and the partition is provided with a connecting hole connecting the first cavity and the second cavity, and the cup body is also provided with a liquid outlet connected to the second cavity. The valve has a liquid inlet end and a liquid outlet end, and the liquid inlet end is installed at the liquid outlet. The sealing member has a blocking position for blocking the connecting hole and an unsealing position for unsealing the connecting hole. The first valve body is connected to the second cavity, and is used to cooperate with the negative pressure device outside the liquid injection cup to extract the gas in the second cavity. The liquid injection mechanism can reduce the risk that the electrolyte in the current liquid injection nozzle is easy to enter the pipeline or valve body of the negative pressure module.

Description

[Technical field]

[0001] The embodiments of the present application relate to the field of liquid injection technology, and in particular to a liquid injection cup, a liquid injection mechanism and a liquid injection device. [Background technology]

[0002] During the production process of lithium-ion batteries, electrolyte needs to be injected into the battery shell, and this process is generally achieved through liquid injection equipment. Generally, the liquid injection equipment will include a liquid injection cup, a liquid adding module and a negative pressure module. Among them, the liquid injection cup includes a cup body, a liquid injection valve and a liquid injection nozzle; the cup body is provided with a liquid storage cavity for accommodating electrolyte, and the bottom of the cup body is provided with a liquid outlet connected to the liquid storage cavity; the liquid inlet end of the liquid injection valve is installed at the liquid outlet; and the liquid injection nozzle is installed at the liquid outlet end of the liquid injection valve. The negative pressure module is connected to the liquid injection nozzle, and it is used to evacuate the inside of the battery shell when the liquid injection nozzle is aligned with the liquid injection hole of the battery.

[0003] The inventors of the present application discovered during the process of implementing the present application that electrolyte is easily attached to the end of the inner wall of the filling nozzle that is away from the cup body. During the process of the negative pressure module evacuating the battery, the electrolyte in the filling nozzle is easy to enter the pipe or valve body of the negative pressure module and may further form electrolyte crystals, which may cause blockage of the above-mentioned pipe or valve body. [Summary of the invention]

[0004] The embodiments of the present application aim to provide a liquid filling cup, a liquid filling mechanism and a liquid filling device, so as to reduce the risk that the electrolyte in the current liquid filling nozzle can easily enter the pipeline or valve body of the negative pressure module.

[0005] In a first aspect, the present application provides a liquid filling cup. The liquid filling cup includes a cup body, a valve, a sealing member, and a first valve body. The cup body is provided with a first cavity and a second cavity that are spaced apart, the cup body includes a partition separating the first cavity and the second cavity, the partition is provided with a connecting hole connecting the first cavity and the second cavity, and the cup body is also provided with a liquid outlet connected to the second cavity. The valve has a liquid inlet end and a liquid outlet end, and the liquid inlet end is installed at the liquid outlet. The sealing member has a blocking position for blocking the connecting hole and an unsealing position for unsealing the connecting hole. The first valve body is connected to the second cavity, and is used to cooperate with the negative pressure device outside the liquid filling cup to extract the gas in the second cavity.

[0006] In the technical solution of the embodiment of the present application, the first valve body in the liquid injection mechanism is connected to the cup body, and is used to cooperate with the negative pressure device outside the liquid injection cup to evacuate the second cavity. That is, the first valve body is located upstream of the valve, not downstream of the valve. On the one hand, the distance between the first valve body and the liquid injection nozzle is relatively far, which can reduce the risk of the electrolyte attached to the liquid injection nozzle being sucked into the first valve body or the negative pressure device; on the other hand, the cross-section of the second cavity is larger than the diameter of the liquid injection nozzle and the first valve body. Even if the electrolyte leaves the liquid injection nozzle, it will mostly fall into the second cavity and settle at the bottom of the second cavity, and it is not easy to be sucked into the first valve body. Therefore, the liquid injection mechanism provided in the embodiment of the present application can reduce the risk that the electrolyte in the current liquid injection nozzle can easily enter the pipeline or valve body of the negative pressure module.

[0007] In some embodiments, the liquid injection cup further includes a second valve body. The second valve body is connected to the second cavity and is used to cooperate with a positive pressure device outside the liquid injection cup to pass gas into the second cavity. In this way, the liquid in the second cavity can be pressed into the lithium-ion battery during or after the liquid injection mechanism is used to inject liquid into the lithium-ion battery.

[0008] In some embodiments, the liquid filling cup further comprises a normal pressure valve installed on the cup body. The normal pressure valve has a first vent and a second vent, the first vent is connected to the second cavity, and the second vent is connected to the atmosphere outside the liquid filling cup. The normal pressure valve is provided to facilitate timely pressure relief of the second cavity.

[0009] In some embodiments, the liquid injection cup further includes a pressure gauge installed on the cup body, and the pressure gauge is used to detect the air pressure in the second cavity.

[0010] In some embodiments, the cup body includes a first cup body, the partition and a second cup body arranged in sequence along a preset direction. The first cup body is provided with a through first cavity, one end of the first cavity leads to the partition. The second cup body is provided with the second cavity, one end of the second cavity leads to the partition.

[0011] In some embodiments, the cup body further comprises a base. The base cover is arranged at one end of the second cavity away from the partition and is provided with the liquid outlet.

[0012] In some embodiments, in some embodiments, the cup body further comprises a top cover. The top cover is provided at one end of the first cavity away from the partition and is provided with a liquid inlet. By providing the top cover, the disadvantage of the electrolyte splashing outside the cup body during the process of adding electrolyte to the first cavity can be avoided.

[0013] In some embodiments, the blocking member passes through the top cover and extends into the first cavity.

[0014] In some embodiments, a timer is further included and the timer is installed on the cup body.

[0015] In some embodiments, a liquid injection nozzle is further included, and the liquid injection nozzle is installed at the liquid outlet end of the valve.

[0016] In a second aspect, an embodiment of the present application further provides a liquid injection mechanism, which includes the liquid injection mechanism described in any one of the above items.

[0017] In some embodiments, the liquid injection mechanism further includes a negative pressure device, which is connected to the first valve body and is used to cooperate with the first valve body to extract gas from the second cavity.

[0018] In some embodiments, the liquid injection mechanism further includes a positive pressure device, which is connected to the second valve body and is used to cooperate with the second valve body to introduce gas into the second cavity.

[0019] In some embodiments, the liquid injection mechanism further comprises a driving device, wherein the driving device is connected to the blocking member and is used to drive the blocking member to move between the blocking position and the unblocking position.

[0020] In some embodiments, the injection mechanism further comprises a controller. The negative pressure device, the positive pressure device and the driving device are all electrically connected to the controller.

[0021] An embodiment of the present application also provides a liquid injection formation device, which includes the liquid injection mechanism or liquid injection cup described in any one of the above items.

Brief Description of the Drawings

[0022] One or more embodiments are exemplarily described by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and the figures in the drawings do not constitute proportional limitations unless otherwise stated.

[0023] Figure 1 A three-dimensional schematic diagram of a liquid injection mechanism and a lithium-ion battery in a close proximity state provided by one embodiment of the present application;

[0024] Figure 2 for Figure 1 Schematic diagram of the cross section of the center injection mechanism along line AA;

[0025] Figure 3 for Figure 1 Schematic diagram of the connection between the controller and other components in the liquid injection mechanism;

[0026] Figure 4A three-dimensional schematic diagram of a liquid injection cup provided in one embodiment of the present application;

[0027] Figure 5 A schematic diagram of a process for manufacturing a lithium-ion battery provided in one embodiment of the present application;

[0028] Figure 6 for Figure 5 Schematic diagram of the process of step S210;

[0029] Figure 7 for Figure 5 Schematic diagram of the process of step S230.

[0030] In the figure:

[0031] 1. Liquid injection mechanism;

[0032] 100, liquid injection cup; 110, cup body; 120, valve; 130, liquid injection nozzle; 140, blocking member; 150, first valve body; 160, second valve body; 170, third valve body; 180, gas-liquid separator; 190, pressure gauge; 111, first cup body; 112, second cup body; 113, partition; 114, base; 115, top cover; 121, liquid inlet end; 122, liquid outlet end; 181, connecting pipe; 101, first cavity; 102, second cavity; 103, connecting hole; 1031, first guide groove; 1032, first hole; 104, liquid outlet; 1041, second guide groove; 1042, second hole;

[0033] 200, liquid adding device;

[0034] 300. Negative pressure device;

[0035] 400, positive pressure device;

[0036] 500, driving device;

[0037] 600, controller;

[0038] 2. Lithium-ion battery. [Specific implementation method]

[0039] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" / "fixed to" / "installed on" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right", "inside", "outside" and similar expressions used in this specification are for illustrative purposes only.

[0040] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0041] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0042] In this specification, the term "installation" includes fixing or restricting a component or device to a specific position or place by welding, screwing, clamping, bonding, etc. The component or device may remain stationary at the specific position or place or move within a limited range. After being fixed or restricted to a specific position or place, the component or device may or may not be disassembled, which is not limited in the embodiments of the present application.

[0043] Please read first Figure 1 and Figure 2 , which respectively show a three-dimensional schematic diagram of the liquid injection mechanism 1 and the lithium-ion battery 2 provided in one embodiment of the present application in a close state, and a cross-sectional schematic diagram of the liquid injection mechanism 1 along the AA line shown in the figure. The liquid injection mechanism 1 is used to inject liquid into the lithium-ion battery 2, and includes a liquid injection cup 100, a liquid adding device 200 and a negative pressure device 300. Among them, the liquid injection cup 100 is used to receive the electrolyte injected by the liquid adding device 200, and inject the received electrolyte into the shell of the lithium-ion battery 2. The negative pressure device 300 is connected to the liquid injection cup 100, and is used to vacuum the lithium-ion battery 2 through the liquid injection cup 100. Next, the specific structures of the above-mentioned liquid injection cup 100, the liquid adding device 200 and the negative pressure device 300 are explained in turn.

[0044] Please continue reading Figure 1 and Figure 2The liquid filling cup 100 is a container for storing and outputting electrolyte to a lithium-ion battery, and specifically includes a cup body 110, a valve 120, a liquid filling nozzle 130, a plugging member 140, and a first valve body 150. The cup body 110 is provided with a first cavity 101 and a second cavity 102 which are spaced apart, and the first cavity 101 and the second cavity 102 are separated by a partition 113; accordingly, the partition 113 is provided with a connecting hole 103 connecting the first cavity 101 and the second cavity 102. In addition, the cup body 110 is also provided with a liquid outlet 104 connected to the second cavity 102. Among them, the first cavity 101 is used to receive the electrolyte injected from the liquid adding device 200, and the electrolyte in the first cavity 101 can flow out of the cup body 110 through the connecting hole 103, the second cavity 102 and the liquid outlet 104 in sequence. The valve 120 has a liquid inlet end 121 and a liquid outlet end 122. The liquid inlet end 121 is installed at the above-mentioned liquid outlet 104, and the liquid outlet end 122 is used to install the liquid injection nozzle 130. The blocking member 140 has a blocking position for blocking the communication hole 103 and an unblocking position for unblocking the communication hole 103, thereby controlling whether the first cavity 101 is connected to the second cavity 102. The first valve body 150 is connected to the above-mentioned second cavity 102, and is used to cooperate with the negative pressure device 300 outside the liquid injection cup 100, thereby extracting the gas in the second cavity 102, so that the second cavity 102 is in a negative pressure environment.

[0045] Compared with the liquid injection mechanism currently on the market, the first valve body 150 and the negative pressure device 300 in the liquid injection mechanism 1 provided in the embodiment of the present application are connected to the cup body 110 in sequence. That is, the first valve body 150 and the negative pressure device 300 are located upstream of the valve 120, rather than downstream of the valve 120. On the one hand, the distance between the first valve body 150 and the liquid injection nozzle 130 is relatively far, which can reduce the risk of the electrolyte crystals attached to the liquid injection nozzle 130 being sucked into the first valve body 150 or the negative pressure device 300; on the other hand, the cross-section of the second cavity 102 is larger than the diameter of the liquid injection nozzle 130 and the first valve body 150. Even if there are electrolyte crystals that break away from the liquid injection nozzle 130, they will mostly fall into the second cavity 102 and settle at the bottom of the second cavity 102, and are not easily sucked into the first valve body 150. Therefore, the liquid injection mechanism 1 provided in the embodiment of the present application can reduce the risk that the crystallized electrolyte in the current liquid injection nozzle 130 is easy to enter the pipeline or valve body of the negative pressure module.

[0046] For ease of understanding, let's combine Figure 1 and Figure 2 The specific structures of the cup body 110 , the valve 120 , the liquid injection nozzle 130 , the blocking member 140 and the first valve body 150 are described in detail in turn.

[0047] For the aforementioned cup body 110, please refer to Figure 1 and Figure 2, which specifically includes a first cup body 111, a second cup body 112, a partition 113 and a base 114; the first cup body 111, the partition 113, the second cup body 112 and the base 114 are arranged in sequence along the preset direction X shown in the figure. Among them, the first cup body 111 is a cylindrical structure extending along the preset direction X shown in the figure as a whole, and is provided with a first cavity 101 that passes through along the preset direction X. The second cup body 112 is also a cylindrical structure extending along the preset direction X shown in the figure as a whole, and is provided with a second cavity 102 that passes through along the preset direction X. The partition 113 is a plate-like structure and is arranged between the first cup body 111 and the second cup body 112. One side of the partition 113 is covered on one end of the above-mentioned first cavity 101, and the other side is covered on one end of the second cavity 102; that is, one end of the first cavity 101 and the second cavity 102 both lead to the partition 113. The partition 113 is provided with a connecting hole 103 connecting the first cavity 101 and the second cavity 102, so as to facilitate the electrolyte in the first cavity 101 to flow to the second cavity 102. Preferably, in order to reduce the residual amount of electrolyte in the first cavity 101 on the partition 113, thereby affecting the liquid preparation accuracy of the cup body 110 itself, the connecting hole 103 includes a first guide groove 1031 close to the first cavity 101 and a first hole 1032 close to the second cavity 102. Among them, from one end close to the first hole 1032 to the end close to the first cavity 101, the cross-sectional profile of the first guide groove 1031 gradually expands into a trumpet shape; the inner wall of the first guide groove 1031 forms an inclined surface, and the electrolyte in the first cavity 101 will flow along the inclined surface to the first hole 1032 and the second cavity 102, and is not easy to remain on the side of the partition 113 facing the first cavity 101. Preferably, the cross-sectional profile of the first guide groove 1031 near one end of the first cavity 101 is roughly equivalent to the cross-sectional profile of the first cavity 101 perpendicular to the above-mentioned preset direction X, so as to better prevent the electrolyte from remaining. The base 114 is covered at one end of the second cavity 102 away from the partition 113, and is provided with the above-mentioned liquid outlet 104 connected to the second cavity 102, which is used for the electrolyte in the cup body 110 to flow to the valve 120. In this way, the electrolyte injected by the liquid adding device 200 can flow to the valve 120 via the first cavity 101, the connecting hole 103, the second cavity 102 and the liquid outlet 104 in sequence.

[0048] Furthermore, in order to prevent the electrolyte from splashing out of the cup body 110 during the process of preparing the electrolyte for the first cavity 101, the cup body 110 further includes a top cover 115. Figure 2The top cover 115 is a flat structure, and its cover is arranged at one end of the first cavity 101 away from the partition 113, so as to prevent the electrolyte from splashing out. Correspondingly, the top cover 115 is provided with a liquid inlet, so that the liquid adding device 200 can add electrolyte into the first cavity 101 through it. Furthermore, in order to ensure a better sealing effect of the cup body 110 and prevent the electrolyte from leaking from the connection parts of the various components, sealing rings are provided between the top cover 115 and the first cup body 111, between the first cup body 111 and the partition 113, between the partition 113 and the second cup body 112, and between the second cup body 112 and the base 114; the sealing ring fills the gap between two adjacent components in the cup body 110 through elastic deformation, thereby realizing gas-liquid sealing.

[0049] It can be understood that even though in the present embodiment, the cup body 110 includes the first cup body 111, the second cup body 112, the partition 113, the base 114 and the top cover 115 which are separately arranged as above, the present application is not limited to this. As long as the cup body 110 is provided with the first cavity 101 and the second cavity 102 separated by the partition 113, and the partition 113 is provided with the connecting hole 103, the cup body 110 is provided with a liquid outlet connected to the second cavity 102. For example, in some other embodiments of the present application, the first cup body 111 and the partition 113 are integrally formed, the second cup body 112 and the base 114 are integrally formed, and the partition 113 is covered on the second cup body 112; for another example, in some other embodiments of the present application, the first cup body 111 and the second cup body 112 are integrally formed into a cylindrical structure, the partition 113 is installed in the cylindrical structure, and the inner cavity of the cylindrical structure is divided into a first cavity 101 and a second cavity 102, and the base 114 is covered on the end of the second cavity 102 away from the first cavity 101; they are not described in detail here.

[0050] For the aforementioned valve 120, please continue to refer to Figure 1 and Figure 2 , the valve 120 is installed at the above-mentioned liquid outlet 104 through the liquid inlet end 121, and the liquid injection nozzle 130 is installed through the liquid outlet end 122. The valve 120 has an open state and a closed state, and can be switched between the two states by manual or automatic control. The present application does not limit the operation method of its switching. Among them, in the open state, the liquid inlet end 121 and the liquid outlet end 122 are in a state of liquid or gas communication, and the liquid or gas at the liquid inlet end 121 (or liquid outlet end 122) can flow to the liquid outlet end 122 (or liquid inlet end 121); in the closed state, the liquid inlet end 121 and the liquid outlet end 122 are in a state of liquid or gas disconnection, and the liquid or gas at the liquid inlet end 121 (or liquid outlet end 122) cannot flow to the liquid outlet end 122 (or liquid inlet end 121).

[0051] For the aforementioned liquid injection nozzle 130, please continue to refer to Figure 1 and Figure 2 The injection nozzle 130 is installed at the liquid outlet end 122 of the valve 120. One end of the injection nozzle 130 is connected to the liquid outlet end 122, and the other end is used to connect with the injection port on the lithium ion battery 2 during the injection process of the lithium ion battery 2.

[0052] For the aforementioned blocking member 140, please continue to refer to Figure 1 and Figure 2 , at least part of the blocking member 140 extends into the first cavity 101. The blocking member 140 can move between the blocking position and the unblocking position. In the blocking position, the blocking member 140 blocks the above-mentioned connecting hole 103. At this time, the first cavity 101 and the second cavity 102 are isolated from each other, and the electrolyte in the first cavity 101 cannot flow into the second cavity 102; in the unblocking position, the blocking member 140 opens the connecting hole 103. At this time, the first cavity 101 and the second cavity 102 are connected through the connecting hole 103, and the electrolyte in the first cavity 101 can flow into the second cavity 102. In this embodiment, the blocking member 140 is a rod-shaped structure and is provided through the top cover 115. One end of the blocking member 140 extends into the first cavity 101 and is arranged close to the partition 113, and the other end is away from the second cavity 102 and extends to the outside of the first cup body 111. It is understandable that in other embodiments of the present application, the blocking member 140 may also be in other shapes besides the rod shape, or may be located as a whole in the first cavity 101. The present application does not specifically limit its shape structure and setting position, as long as the blocking member 140 can move between the above-mentioned blocking position and the unblocking position to timely block or open the connecting hole 103. For example, in some other embodiments of the present application, the blocking member 140 includes a valve, which is installed at the connecting hole 103 and can translate and / or rotate relative to the connecting hole 103 to move between the above-mentioned blocking position and the unblocking position; and as for the way the valve moves, it can be achieved by manual operation, such as by toggling the valve or a structure connected to the valve, or it can be achieved by electrical control, which is not limited here.

[0053] Furthermore, in order to facilitate the control of the blocking member 140 to switch between the blocking position and the unblocking position, the injection mechanism 1 also includes a driving device 500. Specifically, the driving device 500 is connected to the blocking member 140, and is used to drive the blocking member 140 to move between the blocking position and the unblocking position along the above-mentioned preset direction X. In this embodiment, the driving device 500 includes a motor, a lead screw and a nut; the lead screw extends along the preset direction X, the motor is connected to one end of the lead screw, and the nut is threadedly connected to the lead screw and fixed to the blocking member 140; the motor can drive the lead screw to rotate, thereby driving the nut and the blocking member 140 to move back and forth along the above-mentioned preset direction X, thereby realizing the switching of the blocking member 140 between the blocking position and the unblocking position. It can be understood that in other embodiments of the present application, the driving device 500 can also be any other mechanism that can achieve linear motion output, such as a cylinder or an oil cylinder, or a mechanism that can achieve arc motion output, as long as it can cause the blocking member 140 to displace, thereby opening or blocking the connecting hole 103, which will not be described in detail here.

[0054] For the first valve body 150, please continue to refer to Figure 1 and Figure 2 , the first valve body 150 is installed on the cup body 110 and is connected with the second cavity 102. The first valve body 150 has a first ventilation end and a second ventilation end; wherein the first ventilation end is close to the second cavity 102, and the second ventilation end is far away from the second cavity 102. The first valve body 150 has an open state and a closed state; in the open state, the air path between the first ventilation end and the second ventilation end is connected, and the second cavity 102 can realize airflow exchange with the outside of the cup body 110 through the second ventilation end; in the closed state, the air path between the first ventilation end and the second ventilation end is disconnected, and the second cavity 102 cannot realize airflow exchange with the outside of the cup body 110 through the second ventilation end. In this embodiment, the first valve body 150 includes a vacuum valve, which makes it convenient to control the vacuum degree in the second cavity 102 after connecting to the negative pressure device 300 described below; it can be understood that the setting of the first valve body 150 is intended to provide a structure that can control whether the second cavity 102 is connected to the external air path of the cup body 110. In other embodiments of the present application, the first valve body 150 may also include other valve body structures such as a normal pressure valve.

[0055] For the above-mentioned liquid adding device 200, please continue to combine Figure 1 and Figure 2 , one end of which extends into the first cavity 101 through a pipe, and the liquid adding device 200 is used to add electrolyte into the first cavity 101. The structural form of the liquid adding device 200 is actually diverse, and this application does not make specific restrictions on it. For example, in some embodiments, the liquid adding device 200 includes a liquid pump, a liquid inlet pipe, and a liquid outlet pipe. The liquid pump sucks electrolyte through the liquid inlet pipe and discharges the electrolyte into the first cavity 101 through the liquid outlet pipe.

[0056] For the negative pressure device 300, please continue to refer to Figure 1 and Figure 2 The negative pressure device 300 is connected to the second vent end of the first valve body 150, and is used to cooperate with the first valve body 150 to timely extract the gas in the second cavity 102, so that the second cavity 102 is in a negative pressure environment, thereby facilitating the vacuuming of the shell of the lithium-ion battery 2 before injecting liquid into the lithium-ion battery 2. The negative pressure device 300 and the first valve body 150 together constitute the negative pressure module of the injection mechanism 1. In this embodiment, the negative pressure device 300 includes a vacuum pump; it can be understood that in other embodiments of the present application, the negative pressure device 300 can also be other structural forms, as long as it has a vacuuming function.

[0057] Furthermore, in order to facilitate the injection mechanism to pressurize the liquid in the second cavity 102 into the lithium-ion battery 2 during or after the injection of the lithium-ion battery 2, the injection cup 100 further includes a second valve body 160, and accordingly, the injection mechanism 1 further includes a positive pressure device 400. Specifically, the second valve body 160 is installed on the cup body 110 and communicated with the second cavity 102. The second valve body 160 has a third ventilation end and a fourth ventilation end; wherein the third ventilation end is close to the second cavity 102 and communicated with the second cavity 102, and the fourth ventilation end is far away from the second cavity 102. The second valve body 160 has an open state and a closed state; in the open state, the air path between the third ventilation end and the fourth ventilation end is connected, and the second cavity 102 can achieve airflow exchange with the outside of the cup body 110 via the fourth ventilation end; in the closed state, the air path between the third ventilation end and the fourth ventilation end is disconnected, and the second cavity 102 cannot achieve airflow exchange with the outside of the cup body 110 via the fourth ventilation end. In this embodiment, the second valve body 160 includes a positive pressure valve, which facilitates the control of the air pressure in the second cavity 102 after it is connected to the positive pressure device 400; it can be understood that the setting of the second valve body 160 is intended to provide a structure that can control whether the second cavity 102 is connected to the external air path of the cup body 110. In other embodiments of the present application, the second valve body 160 may also include other valve body structures such as a normal pressure valve. The positive pressure device 400 is connected to the fourth vent end of the second valve body 160, and is used to cooperate with the second valve body 160 to timely introduce gas, such as air and / or inert gas, into the second cavity 102. In this embodiment, the positive pressure device 40 includes an air compressor; it can be understood that in other embodiments of the present application, the positive pressure device 40 can also be other structural forms, as long as it can introduce gas into the second cavity 102.

[0058] Furthermore, in order to facilitate the second cavity 102 to return to normal pressure after being in a negative pressure or positive pressure environment, the above-mentioned liquid injection cup 100 also includes a third valve body 170. Specifically, the first valve body 150 is installed on the cup body 110 and communicated with the second cavity 102, and has a first vent and a second vent; wherein the first vent is close to the second cavity 102 and communicated with the second cavity 102, and the second vent is far away from the second cavity 102 and communicated with the external atmosphere of the liquid injection cup 100. The third valve body 170 has an open state and a closed state; in the open state, the air path between the first vent and the second vent is connected, and the second cavity 102 can achieve airflow exchange with the outside of the cup body 110 through the second vent; in the closed state, the air path between the first vent and the second vent is disconnected, and the second cavity 102 cannot achieve airflow exchange with the outside of the cup body 110 through the second vent. In this embodiment, the third valve body 170 includes a normal pressure valve.

[0059] In this embodiment, the first valve body 150, the second valve body 160 and the third valve body 170 are indirectly installed on the cup body 110 through the connecting pipe 181 and the gas-liquid separator 180. Specifically, the partition 113 is provided with an air flow channel 1131, one end of which leads to the second cavity 102, and the other end leads to the external environment of the cup body 110. One end of the connecting pipe 181 is installed in the air flow channel 1131, and the other end is connected to the air inlet end of the gas-liquid separator 180. The gas-liquid separator 180 is used to filter liquids and solids and allow gas to pass through; its main purpose is to prevent the electrolyte in the cup body 110 from adsorbing the above-mentioned valve bodies or negative pressure devices during the operation of the negative pressure device 300, thereby causing corrosion to the valve bodies and the negative pressure device 300. The first valve body 150, the second valve body 160 and the third valve body 170 are installed at the gas outlet end of the gas-liquid separator 180.

[0060] In order to facilitate the injection mechanism 1 to obtain the information in time after the initial injection of the lithium-ion battery 2 is completed, so that the plugging member 140 can timely block the connecting hole 103, and then facilitate the subsequent positive and negative pressure cycle process of the lithium-ion battery 2 by the positive pressure device 400, the third valve body 170 and the negative pressure device 300, the injection cup 100 also includes a pressure gauge 190, which is used to detect the air pressure in the second cavity 102; the positive and negative pressure cycle process will be described in detail in the working process principle of the injection mechanism 1. Specifically, during the injection process, the electrolyte in the first cavity 101 will block the connecting hole 103, and the second cavity 102 will always be in a negative pressure state; and when the electrolyte in the first cavity 101 has all flowed out, the second cavity 102 will be connected with the first cavity 101 and restored to a normal pressure state. When the pressure gauge 190 detects that the second cavity 102 is at normal pressure, it means that all the electrolyte in the first cavity 101 has flowed into the second cavity 102; at this time, the blocking member 140 moves from the unsealing position to the blocking position. In addition, in some other embodiments of the present application, the injection mechanism 1 can also achieve the above purpose in other ways; for example, in some embodiments, the injection cup 100 includes a timer installed on the cup body 110, which is used to measure the time when the blocking member 140 is in the unsealing position. When the timer measures that the blocking member 140 is in the unsealing position for a predetermined time, the blocking member 140 moves from the unsealing position to the blocking position; wherein the "predetermined time" is the time for the lithium-ion battery 2 to receive a preset volume or mass of electrolyte during the injection process, which is positively correlated with the above-mentioned "predetermined volume or mass" and negatively correlated with the cross-sectional area of ​​the connecting hole. That is, when the blocking member 140 maintains the predetermined time in the unsealing position, the first cavity 101 has flowed out a sufficient amount of electrolyte required for the injection process. Compared with the two implementations, the first implementation requires controlling the liquid adding device 200 to accurately add a certain amount of electrolyte into the first cavity 101; while the second implementation does not require this, as long as the electrolyte added to the first cavity 101 by the liquid adding device 200 is ensured to be no less than the electrolyte required in the initial liquid injection process.

[0061] In addition, the liquid injection mechanism 1 also includes a controller. Figure 3 , which shows a connection diagram of the controller and other components in the injection mechanism 1, and combined with other drawings, the controller 600 is electrically connected to the above-mentioned valve 120, the liquid adding device 200, the negative pressure device 300, the positive pressure device 400, and the driving device 500, respectively, and is used to control each device to move in a timely manner, thereby realizing an automated injection process.

[0062] Next, the working process of the liquid injection mechanism 1 will be described in conjunction with the accompanying drawings.

[0063] In the initial state, the valve 120 is in a closed state and the blocking member 140 is in a blocking position. The specific injection process of the injection mechanism 1 is realized by the controller controlling the corresponding device, as follows:

[0064] S110: Control the negative pressure device 300 to start, so as to pre-evacuate the second cavity 102 to a first preset vacuum degree, for example, when the lithium-ion battery needs to be evacuated to -70 kilopascals (KPa), the first preset vacuum degree may be -65KPa; at the same time, control the liquid adding device 200 to input electrolyte into the first cavity 101 for liquid preparation. While this step is being performed, the external loading mechanism transports the lithium-ion battery 2 to the bottom of the liquid injection nozzle 130, and docks the liquid injection nozzle 130 with the liquid injection hole on the lithium-ion battery 2.

[0065] S120: Control the valve 120 to switch to an open state, so that the negative pressure device 300 further evacuates the lithium-ion battery 2 to a second preset vacuum degree, such as the aforementioned -70 KPa.

[0066] S130 : Control the blocking member 140 to move to the unsealing position, and the electrolyte in the first cavity 101 will flow into the housing of the lithium-ion battery 2 through the connecting hole 103 , the second cavity 102 , the liquid outlet 104 , the valve 120 , and the liquid injection nozzle 130 in sequence.

[0067] S140: After injecting a preset volume of electrolyte into the lithium-ion battery 2, control the blocking member 140 to move to the blocking position. Specifically, when the air pressure in the second cavity 102 is normal pressure, or when the timer detects that the blocking member 140 maintains a predetermined time (such as 5S, 10S, etc.) at the unsealing position, the driving device 500 is controlled to drive the blocking member 140 to reset from the unsealing position to the blocking position.

[0068] S150: Perform positive and negative pressure cycle process on lithium-ion battery. Specifically, first, control the third valve body 170 to close, and control the positive pressure device 400 to start, so as to introduce gas into the second cavity 102, and then pressurize the second cavity 102 and the shell of lithium-ion battery 2 to the first preset pressure value, and maintain the pressure for the first preset time; on the one hand, this step can pressurize the electrolyte in the second cavity 102 into the shell of lithium-ion battery to avoid the waste of electrolyte; on the other hand, it is also conducive to promoting the flow of electrolyte in the shell of lithium-ion battery 2, and squeezing out the air in the shell of lithium-ion battery 2. Then, control the third valve body 170 to open, so as to relieve the pressure of the second cavity 102 to the normal pressure state. After that, control the third valve body 170 to close, and control the negative pressure device 300 to start, so as to pump the negative pressure of the second cavity 102 to the second preset pressure value, so as to promote the discharge of gas in the second cavity 102 and lithium-ion battery. Finally, the third valve body 170 is controlled to open to release the pressure of the second cavity 102 to a normal pressure state. The positive and negative pressure cycle process can be repeated multiple times, and the specific number of cycles depends on the specifications of the lithium-ion battery 2. It is worth mentioning that the "normal pressure" described in this application document means the atmospheric pressure of the area where the injection method is performed.

[0069] S160: The valve 120 is closed, and the feeding mechanism drives the lithium-ion battery 2 to move to the next station. At this point, the liquid injection process of a single lithium-ion battery 2 is completed.

[0070] In summary, the liquid injection mechanism 1 provided in the embodiment of the present application includes a liquid injection cup 100, a liquid adding device 200, a negative pressure device 300, a positive pressure device 400 and a driving device 500. Among them, the liquid injection cup 100 includes a cup body 110, a valve 120, a liquid injection nozzle 130, a blocking member 140, a first valve body 150, a second valve body 160 and a third valve body 170. The cup body 110 has a first cavity 101 and a second cavity 102 separated by a partition 113; the first cavity 101 is used to store electrolyte for preparation before liquid injection, and the second cavity 102 is connected to the first valve body 150, which is used to provide a pre-vacuum environment before vacuuming the lithium-ion battery 2, and act as an air flow channel when the lithium-ion battery 2 is formally vacuumed. The negative pressure device 300 is used to cooperate with the first valve body 150 to vacuum the second cavity 102 in a timely manner. The positive pressure device 400 is used to cooperate with the second valve body 160 to timely introduce gas into the second cavity 102. The driving device 500 is used to drive the blocking member 140 to move between the blocking position and the unblocking position, so that the blocking member 140 can open or block the above-mentioned communication hole, thereby controlling whether the first cavity 101 and the second cavity 102 are connected or not.

[0071] Compared with the liquid injection mechanism currently on the market, the first valve body 150 and the negative pressure device 300 in the liquid injection mechanism 1 provided in the embodiment of the present application are connected to the cup body 110 in sequence. That is, the first valve body 150 and the negative pressure device 300 are located upstream of the valve 120, rather than downstream of the valve 120. On the one hand, the distance between the first valve body 150 and the liquid injection nozzle 130 is relatively far, which can reduce the risk of the electrolyte attached to the liquid injection nozzle 130 being sucked into the first valve body 150 or the negative pressure device 300; on the other hand, the cross-section of the second cavity 102 is larger than the diameter of the liquid injection nozzle 130 and the first valve body 150. Even if there is electrolyte detaching from the liquid injection nozzle 130, it will mostly fall into the second cavity 102 and settle at the bottom of the second cavity 102, and it is not easy to be sucked into the first valve body 150. Therefore, the liquid injection mechanism 1 provided in the embodiment of the present application can reduce the risk that the electrolyte in the current liquid injection nozzle 130 is easy to enter the pipeline or valve body of the negative pressure module.

[0072] In addition, the second cavity 102 can provide a space for pre-vacuuming of the negative pressure device 300. Since the pre-vacuuming is carried out simultaneously with the loading of the lithium-ion battery 2, the pre-vacuuming process does not increase the manufacturing cycle of the lithium-ion battery 2. This makes it easier to shorten the time for further formal vacuuming of the lithium-ion battery 2, thereby shortening the overall manufacturing cycle of the lithium-ion battery 2.

[0073] At the same time, in the process of the electrolyte in the first cavity 101 flowing into the shell of the lithium-ion battery 2, the second cavity 102 and the space in the shell of the lithium-ion battery 2 together form a larger negative pressure chamber. The negative pressure module in the injection mechanism 1 currently on the market is directly connected to the injection nozzle, and its negative pressure chamber is composed of the channel of the injection nozzle and the space in the shell of the lithium-ion battery 2; in comparison, the negative pressure chamber of the injection mechanism 1 provided in the embodiment of the present application is larger, so the vacuum loss during the injection process is small, so the electrolyte in the first cavity 101 can still flow into the second cavity 102 and the lithium-ion battery 2 at a faster speed. That is, the setting of the second cavity 102 can also increase the rate at which the electrolyte enters the lithium-ion battery 2, further shortening the manufacturing cycle of the lithium-ion battery 2.

[0074] The present application also provides a liquid filling cup 100, see Figure 4 , which shows a schematic diagram of the liquid injection cup 100. The liquid injection cup 100 has the same structure as the liquid injection cup in the above embodiment, and will not be described in detail here.

[0075] Similar to the effect of the above-mentioned liquid injection mechanism, the liquid injection cup 100 provided in this embodiment can reduce the risk that the electrolyte in the current liquid injection nozzle 130 easily enters the first valve body or the negative pressure device.

[0076] The embodiment of the present application also provides a liquid injection formation device. The liquid injection formation device includes a liquid injection mechanism and a formation mechanism. Among them, the liquid injection mechanism is the liquid injection mechanism 1 described in the above embodiment, which is used to inject liquid into the lithium-ion battery 2. The formation mechanism is used to form the lithium-ion battery 2. In this embodiment, the liquid injection formation device is an integrated device, that is, the liquid injection mechanism and the formation mechanism are integrated together. This setting is conducive to reducing the number of equipment required for the liquid injection formation process, such as logistics transportation lines, etc.; in addition, it can also reduce the overall space occupied by the equipment during the liquid injection formation process, that is, it can improve the utilization rate of the production space.

[0077] The manufacturing of lithium-ion batteries requires the process of injection, standing and formation in sequence. Among them, injection refers to the injection of electrolyte into the lithium-ion battery shell. Standing refers to the static placement of the lithium-ion battery for a period of time after injection, and the standing time is usually between 8 and 72 hours; the purpose of standing is to allow the pole pieces in the lithium-ion battery to be fully infiltrated by the electrolyte, so as to facilitate the subsequent formation process to form a uniform and dense solid electrolyte interface (SEI) film on the surface of the pole piece. Formation refers to the first charging of the manufactured lithium ions, aiming to form a passivation layer on the surface of the pole piece, that is, the above-mentioned SEI film; the formation of the SEI film can well prevent the active material from collapsing and falling off, ensuring the excellent charging and discharging performance and long service life of the lithium-ion battery. The existence of the three processes makes the manufacturing cycle of lithium-ion batteries longer; and manufacturers also need to prepare additional placement space and placement devices for the standing of lithium-ion batteries, such as factories, shelves, etc.; thus, the overall manufacturing cycle of lithium-ion batteries is long and the manufacturing cost is high.

[0078] The present application also provides a method for manufacturing a lithium-ion battery (hereinafter referred to as the manufacturing method) to improve the current situation of a long overall manufacturing cycle of lithium-ion batteries. Figure 5 , which shows a schematic flow chart of the manufacturing method, the manufacturing method includes a liquid injection forming process, and the liquid injection forming process specifically includes the following steps:

[0079] S210: injecting electrolyte into the housing of the lithium-ion battery;

[0080] S220: After the electrolyte is injected into the shell of the lithium-ion battery, the lithium-ion battery is formed.

[0081] This manufacturing method aims to utilize the heat generated during the formation process of lithium-ion batteries to promote the infiltration of electrolyte into the pole piece. Specifically, the heat generated by the formation can promote the diffusion of lithium ions and other components in the electrolyte in the lithium-ion battery shell, thereby better infiltrating the pole piece; in addition, the heat generated by the formation can also promote the escape of local trace gases between the pole piece and the adjacent structure, so the heat generated by the formation process can accelerate the infiltration of the electrolyte into the pole piece, and the infiltration effect is excellent. At the same time, this manufacturing method omits the relatively long standing process between the injection step and the formation step, so this manufacturing method can shorten the manufacturing cycle of lithium-ion batteries; at the same time, lithium-ion battery manufacturers do not need to specifically provide the placement space required for standing lithium-ion batteries.

[0082] Next, the method is applied to the above-mentioned liquid injection forming equipment as an example to illustrate the above-mentioned embodiment and the accompanying drawings. Figure 6 , which shows a specific flow chart of step S210, the step S210 includes:

[0083] S211: Control the valve 120 to be in a closed state, and control the blocking member 140 to be in a blocking position. Then the bottom of the first cavity 101 is blocked, which is convenient for storing electrolyte; the second cavity 102 is a substantially sealed chamber, which is convenient for the subsequent pre-vacuuming process.

[0084] S212: Control the negative pressure module to pre-evacuate the second cavity 102 to a first preset vacuum degree. The negative pressure module includes the above-mentioned first valve body 150 and the negative pressure device 300. Specifically, the negative pressure device 300 is controlled to start to pre-evacuate the second cavity 102 to a first predetermined vacuum degree. The value of the first predetermined vacuum degree depends on the second predetermined vacuum degree that the lithium-ion battery needs to be evacuated to, and its absolute value is slightly smaller than the absolute value of the second predetermined vacuum degree. For example, when the lithium-ion battery needs to be evacuated to -70KPa, the first predetermined vacuum degree can be -65KPa. In fact, the absolute value of the first predetermined vacuum degree can also be greater than the absolute value of the second predetermined vacuum degree; for example, by accurately controlling the first vacuum degree value, after the valve 120 is opened, the second cavity 102 and the inside of the lithium-ion battery 2 shell together form a chamber to reach the second predetermined vacuum degree. However, due to the differences in the shapes of different lithium-ion batteries, the vacuum degrees of each lithium-ion battery 2 will have certain differences. It is worth noting that the pre-vacuuming process can be carried out simultaneously with the lithium-ion battery loading process, so this process will not increase the lithium-ion battery manufacturing cycle; the pre-vacuuming step is also beneficial to shorten the subsequent time for formally vacuuming the lithium-ion battery 2.

[0085] S213: Control the liquid adding device 200 to inject electrolyte into the first cavity 101 to prepare the electrolyte for subsequent injection into the housing of the lithium-ion battery 2 .

[0086] S214 : Control the liquid outlet nozzle 130 to dock with the liquid injection hole of the lithium-ion battery 2 .

[0087] S215: Control valve 120 to switch to an open state.

[0088] S216: Control the negative pressure module to evacuate the second cavity 102 to a second preset vacuum degree. For example, the second cavity 102 and the housing of the lithium-ion battery 2 are evacuated to the above -70 KPa through the negative pressure device 300 and the first valve body 150 .

[0089] S217: Control the blocking member 140 to switch to the unblocking position, so that the electrolyte in the first cavity 101 flows into the shell. Specifically, the driving device 500 is controlled to drive the blocking member 140 to move from the blocking position to the unblocking position along the preset direction X, so as to open the connecting hole 103; thus, the electrolyte in the first cavity 101 flows into the second cavity 102 through the connecting hole 103.

[0090] Furthermore, in order to facilitate the injection of the electrolyte remaining on the inner wall of the second cavity 102 into the interior of the lithium-ion battery, the manufacturing method further includes:

[0091] S218: After the above-mentioned step of controlling the blocking member 140 to switch to the unsealing position, the blocking member 140 is controlled to switch to the blocking position. In this way, the first cavity 101 and the second cavity 102 are isolated and independent from each other. In some embodiments, after the blocking member 140 maintains the unsealing position for a predetermined period of time, the blocking member 140 is controlled to switch to the blocking position; specifically, the time the blocking member 140 maintains in the unsealing position can be measured by the above-mentioned timer, and when it is maintained for a predetermined period of time, the driving device 500 is controlled to drive the blocking member 140 to move from the unsealing position to the blocking position. In other embodiments, when it is detected that the air pressure in the second cavity 102 is the same as the atmospheric pressure outside the cup body 110, the blocking member 140 is controlled to switch to the blocking position; specifically, the air pressure of the second cavity 102 can be detected by the above-mentioned pressure gauge, and when the detected air pressure value is the same as the external atmospheric pressure, the driving device 500 is controlled to drive the blocking member 140 to move from the unsealing position to the blocking position.

[0092] In order to force the electrolyte on the inner wall of the second cavity 102 into the housing of the lithium-ion battery 2 before the lithium-ion battery 2 is formed, and to make the lithium-ion battery have a better infiltration effect at this time, please combine Figure 5 , the manufacturing method further comprises:

[0093] S230: Before the lithium-ion battery is formed, the lithium-ion battery is subjected to a positive and negative pressure cycle process. Figure 7, which shows a specific flow chart of step S230. Combined with other drawings, in this embodiment, the following steps performed in sequence in step S230 include:

[0094] S231: Pressurize the lithium-ion battery shell to a first preset pressure value, and maintain the pressure for a first preset time. Specifically, control the positive pressure device 400 to start to introduce gas into the second cavity 102, so that the second cavity 102 is at a first preset pressure value, and maintains the pressure for a first preset time. Among them, the first preset pressure value is greater than the atmospheric pressure value of the area where the manufacturing method is performed. For example, in some embodiments, the gas is introduced into the second cavity 102 to a pressure of 150KPa in the second cavity 102, and maintained for 10S. Preferably, the above-mentioned introduced gas includes an inert gas, such as at least one of helium, nitrogen and argon; of course, in other embodiments, other types of inert gases may also be included, which are not listed here in detail. On the one hand, this step can promote the electrolyte on the inner wall of the second cavity 102 to flow into the lithium-ion battery shell, reducing the residual amount of electrolyte on the inner wall of the second cup body 112; on the other hand, it can also promote the electrolyte to flow in the lithium-ion battery 2 shell, thereby squeezing out the air in the lithium-ion battery 2 shell and enhancing the electrolyte infiltration effect.

[0095] S232: Relieve the pressure of the lithium-ion battery housing to normal pressure. The "normal pressure" mentioned in this application document refers to the atmospheric pressure of the area where the manufacturing method is performed.

[0096] S233: Pump negative pressure into the lithium-ion battery shell to a second preset pressure value, and maintain the pressure for a second preset time. Specifically, control the negative pressure device 300 to start to pump negative pressure into the second cavity 102, so that the second cavity 102 has a second preset pressure value and is maintained for a second preset time. The second preset pressure value is less than the atmospheric pressure value of the area where the manufacturing method is performed. For example, in some embodiments, the second cavity 102 is evacuated to -50KPa and maintained for 10S. This step is conducive to promoting the discharge of air in the lithium-ion battery 2 shell to the outside.

[0097] S234: Release the pressure of the lithium-ion battery casing to normal pressure.

[0098] Since the time occupied by step S230 is significantly shorter than the time occupied by the static state in the prior art, the manufacturing method can still shorten the manufacturing cycle of the lithium-ion battery 2. It is worth mentioning that step S232 and step S234 can be omitted in some cases, and the order of step S231 and step S233 can be interchanged. In addition, step S230 can be cycled multiple times, and the specific number of cycles depends on the specifications of the lithium-ion battery 2.

[0099] Step S220 specifically includes: applying a current of a preset intensity to the lithium-ion battery for a preset duration so that the above-mentioned SEI film is formed on the surface of the electrode.

[0100] Furthermore, considering that the lithium-ion battery 2 will cause the consumption of electrolyte during the formation process, which will affect the wetting effect of the electrolyte on the electrode to a certain extent. To overcome this shortcoming, the manufacturing method also includes step S221: during the formation of the lithium-ion battery 2, the electrolyte is added to the shell of the lithium-ion battery 2. Furthermore, to ensure that the electrolyte is stored in the first cavity 101 during step S221, the manufacturing method also includes step S222: during the formation of the lithium-ion battery 2, the electrolyte is injected into the first cavity 101.

[0101] Furthermore, in order to further promote the infiltration of the electrolyte into the electrode during the formation of the lithium-ion battery 2 and to discharge the gas generated during the formation process, the manufacturing method also includes step S223: during the formation of the lithium-ion battery 2, the above-mentioned positive and negative pressure cycle process is performed.

[0102] Furthermore, after the formation process is completed, in order to stabilize the effect of SEI film formation and enable the lithium-ion battery 2 to store more electrolyte before leaving the factory, the manufacturing method further includes, after the step of forming the lithium-ion battery:

[0103] S240: Let the lithium-ion battery stand for a set time. After the formation is completed, the lithium-ion battery 2 still has a relatively high temperature. Standing for a certain period of time can stabilize the formation effect of the SEI film with the help of the remaining heat. Generally, the standing time can be controlled to be from a few minutes to a few hours. Preferably, during the process of this step, the above-mentioned positive and negative pressure cycle process can also be performed.

[0104] S250: After step 240, the electrolyte is added to the housing. On the one hand, the electrolyte injected during the initial injection can be a surplus, and on the other hand, the electrolyte will be consumed during the formation process; adding electrolyte after standing still can allow the lithium-ion battery to retain the maximum amount of electrolyte when it leaves the factory, thereby improving the energy density of the lithium-ion battery.

[0105] The present application also provides a lithium-ion battery, which is manufactured by the above manufacturing method.

[0106] 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. Under the concept of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present application as described above, which are not provided in detail for the sake of simplicity. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A liquid injection cup (100), characterized in that: include: A cup body (110) is provided with a first cavity (101) and a second cavity (102) arranged at an interval, the cup body (110) comprises a partition (113) separating the first cavity (101) and the second cavity (102), the partition (113) is provided with a communication hole (103) connecting the first cavity (101) and the second cavity (102), and the cup body (110) is also provided with a liquid outlet (104) communicating with the second cavity (102); A valve (120) having a liquid inlet end (121) and a liquid outlet end (122), wherein the liquid inlet end (121) is installed at the liquid outlet (104); A blocking member (140) having a blocking position for blocking the communicating hole (103) and an unblocking position for unblocking the communicating hole (103); and a first valve body (150) which is in communication with the second cavity (102) and is used to cooperate with a negative pressure device outside the liquid injection cup (100) to extract gas from the second cavity (102).

2. The liquid filling cup (100) according to claim 1, characterized in that: Also includes a second valve body (160); The second valve body (160) is in communication with the second cavity (102), and is used to cooperate with a positive pressure device outside the liquid injection cup (100) to allow gas to flow into the second cavity (102).

3. The liquid filling cup (100) according to claim 2, characterized in that: It also includes a normal pressure valve installed on the cup body (110); The normal pressure valve has a first vent and a second vent, the first vent is in communication with the second cavity (102), and the second vent is in communication with the atmosphere outside the liquid injection cup (100).

4. The liquid filling cup (100) according to claim 2, characterized in that: It also includes a pressure gauge (190) installed on the cup body (110), and the pressure gauge (190) is used to detect the air pressure in the second cavity (102).

5. The liquid filling cup (100) according to claim 2, characterized in that: The cup body (110) comprises a first cup body (111), the partition (113), and a second cup body (112) which are sequentially arranged along a preset direction; The first cup body (111) is provided with a through first cavity (101), and one end of the first cavity (101) leads to the partition (113); The second cup body (112) is provided with the second cavity (102), and one end of the second cavity (102) leads to the partition (113).

6. The liquid filling cup (100) according to claim 5, characterized in that: The cup body (110) further comprises a base (114); the base (114) is arranged to cover an end of the second cavity (102) away from the partition (113), and is provided with the liquid outlet (104).

7. The liquid filling cup (100) according to claim 5, characterized in that: The cup body (110) further includes a top cover (115); The top cover (115) is arranged on an end of the first cavity (101) away from the partition (113) and is provided with a liquid inlet.

8. The liquid filling cup (100) according to claim 7, characterized in that: The blocking member (140) passes through the top cover (115) and extends into the first cavity (101).

9. The liquid filling cup (100) according to claim 2, characterized in that: Also includes a timer; The timer is mounted on the cup body (110).

10. The liquid filling cup (100) according to any one of claims 2 to 9, characterized in that: It also includes a liquid injection nozzle (130), and the liquid injection nozzle (130) is installed on the liquid outlet end (122) of the valve (120).

11. A liquid injection mechanism (1), characterized in that: It comprises the liquid filling cup (100) according to any one of claims 2 to 10.

12. The liquid injection mechanism (1) according to claim 11, characterized in that: Also included is a negative pressure device (300); The negative pressure device (300) is connected to the first valve body (150), and the negative pressure device (300) is used to cooperate with the first valve body (150) to extract gas from the second cavity (102).

13. The liquid injection mechanism (1) according to claim 12, characterized in that: Also included is a positive pressure device (400); The positive pressure device (400) is connected to the second valve body (160), and the positive pressure device (400) is used to cooperate with the second valve body (160) to introduce gas into the second cavity (102).

14. The liquid injection mechanism (1) according to claim 13, characterized in that: Also includes a driving device (500); The driving device (500) is connected to the blocking member (140) and is used to drive the blocking member (140) to move between the blocking position and the unblocking position.

15. The liquid injection mechanism (1) according to claim 14, characterized in that: Also includes a controller; The negative pressure device (300), the positive pressure device (400) and the driving device (500) are all electrically connected to the controller.

16. A liquid injection forming device, characterized in that: include: The liquid filling cup (100) according to any one of claims 1 to 10; Alternatively, the liquid injection mechanism (1) as described in any one of claims 11 to 15.

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