Electrolyte injection safety device, electrolyte injection method, and electrolyte injection system for battery

Abstract

Provided are an electrolyte injection safety device, electrolyte injection method, and electrolyte injection system for a battery. The electrolyte injection safety device for a battery is applied to a battery (100) having an electrolyte injection port (1312). The electrolyte injection safety device comprises an electrolyte injection member channel (210) provided corresponding to the electrolyte injection port (1312) of the battery (100), and the electrolyte injection member channel (210) is used for an electrolyte injection member (300) to pass through, so that the electrolyte injection member (300) passes through the electrolyte injection port (1312) of the battery (100) to inject an electrolyte into the battery (100). During electrolyte injection, the electrolyte injection safety device is used for protecting the battery, and the electrolyte injection member can accurately pass through the electrolyte injection port of the battery by means of the electrolyte injection member channel provided in the electrolyte injection safety device, reducing the possibility of deviation of the electrolyte injection member affecting batteries, improving the manufacturing performance of batteries during electrolyte injection and the use reliability of batteries.

Description

Battery filling safety device, filling method and filling system

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202310873370.5, filed on July 17, 2023, entitled “Battery filling safety device, filling method and filling system,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] Embodiments of the present application relate to the field of batteries, and more specifically, to a battery liquid injection safety device, a liquid injection method, and a liquid injection system. Background Art

[0004] With the development of the times, electric vehicles have huge market prospects due to their high environmental protection, low noise, low cost of use and other advantages. They can effectively promote energy conservation and emission reduction, and are beneficial to social development and progress. For electric vehicles, battery technology is a key factor in their development.

[0005] In the development of battery technology, in addition to focusing on electrical performance such as charging and discharging, attention must also be paid to battery manufacturing and processing performance. For example, the electrolyte, a component of the battery, and the process of injecting the electrolyte into the battery casing are crucial to the overall performance of the battery. Given this, how to improve the manufacturing performance of batteries during the electrolyte injection process is a technical problem that needs to be solved urgently.

[0006] Summary of the Invention

[0007] The embodiments of the present application provide a battery liquid injection safety device, a liquid injection method, and a liquid injection system, which can improve the manufacturing performance of the battery during the liquid injection process.

[0008] In a first aspect, a battery injection safety device is provided, which is applied to a battery having an injection port. The injection safety device includes: an injection member channel, the injection member channel is arranged corresponding to the injection port of the battery, and the injection member channel is used to pass the injection member so that the injection member passes through the injection port of the battery to inject electrolyte into the interior of the battery.

[0009] Through the technical solution of the embodiments of the present application, the battery is injected with an injection piece, which can reduce the problem of electrolyte contamination caused by electrolyte leakage during the injection process. Furthermore, during the injection process, the battery is protected by an injection safety device, and the injection piece can be more accurately passed through the injection port of the battery through the injection piece channel provided in the injection safety device, reducing the possibility of the injection piece deflecting and affecting the battery, thereby improving the manufacturing performance of the battery during the injection process and the reliability of the battery.

[0010] In some possible implementations, the liquid filling safety device includes a liquid filling safety cap, and the liquid filling safety cap is configured to be buckled onto the battery.

[0011] Through the technical solution of this embodiment, the liquid injection safety device is designed as a liquid injection safety cap, which is conducive to the liquid injection safety cap being fixed to the battery more conveniently and reliably. The positional relationship between the liquid injection safety cap and the battery is relatively fixed, so that the liquid injection part can enter the interior of the battery through the liquid injection safety cap more accurately, which is conducive to further improving the manufacturing performance of the battery during the liquid injection process.

[0012] In some possible embodiments, a first inclined guide groove is formed at one end of the injection piece channel away from the battery, the inclined surface of the first inclined guide groove is inclined relative to the axial direction of the injection piece channel, and the first inclined guide groove is used to guide the injection piece into the injection piece channel.

[0013] Through the technical solution of this embodiment, the diameter of the injection piece channel at the inlet end (that is, the end of the injection piece channel away from the battery) can be expanded, which is conducive to the injection piece entering the injection piece channel more conveniently and smoothly, and reduces the probability of the injection piece getting stuck at the inlet end of the injection piece channel, thereby further improving the manufacturing performance of the battery during the injection process.

[0014] In some possible implementations, the first inclined surface guide groove includes a conical surface guide groove.

[0015] Through the technical solution of this embodiment, the first inclined guide groove is designed as a conical guide groove, so that the first inclined guide groove has a smooth surface, thereby facilitating a good guiding effect on the injection part, further reducing the probability of the injection part getting stuck in the injection part channel, and improving the manufacturing performance of the battery during the injection process.

[0016] In some possible embodiments, a second bevel guide groove is provided at one end of the liquid filling safety cap that is buckled onto the battery, wherein the bevel of the second bevel guide groove is inclined relative to the wall of the battery, and the second bevel guide groove is used to guide the liquid filling safety cap to be buckled onto the battery.

[0017] Through the technical solution of this embodiment, the second inclined guide groove can expand the inner diameter of the liquid filling safety cap, thereby allowing the battery to have a larger displacement margin. Even if the battery has a certain position offset compared to the liquid filling safety cap, the liquid filling safety cap can be smoothly buckled onto the battery through the second inclined guide groove, thereby further improving the battery production efficiency during the liquid filling process.

[0018] In some possible implementations, the second inclined surface guide groove includes a conical surface guide groove.

[0019] Through the technical solution of this embodiment, the second inclined guide groove is designed as a conical guide groove, so that the second inclined guide groove has a smooth surface, thereby facilitating a good guiding effect on the battery, so that the battery can be stably and reliably engaged with the liquid filling safety cap, further improving the manufacturing performance of the battery during the liquid filling process.

[0020] In some possible implementations, the liquid injection safety device is disposed corresponding to the wall where the electrode terminal of the battery is located, and a receiving groove for receiving the electrode terminal is formed in the liquid injection safety device.

[0021] Through the technical solution of this embodiment, the receiving groove in the liquid injection safety device can provide good protection for the electrode terminals, and can also enable the liquid injection safety device to be accurately aligned with the battery, thereby improving the correspondence between the liquid injection channel in the liquid injection safety device and the liquid injection port in the battery, thereby further improving the manufacturing performance of the battery during the liquid injection process.

[0022] In some possible implementations, the shape of the receiving groove matches the shape of the electrode terminal.

[0023] This technical solution allows the first receiving groove and the electrode terminal to mate with each other, achieving high alignment precision and a close fit, enhancing the connection stability between the injection safety device and the battery. Furthermore, the gap between the first receiving groove and the electrode terminal is small, effectively protecting the electrode terminal and reducing environmental interference and impact on the electrode terminal during injection.

[0024] In some possible implementations, an air guide groove is provided in the liquid filling safety device, and the air guide groove is connected to a first surface of the liquid filling safety device attached to the battery and a surface of the liquid filling safety device facing the external environment.

[0025] Through the technical solution of this embodiment, the air guide groove can introduce atmospheric gas in the external environment into the gap between the first surface of the liquid injection safety device and the battery, thereby increasing the pressure between the liquid injection safety device and the battery, facilitating the separation of the liquid injection safety device from the battery, and thereby improving the production efficiency of the battery.

[0026] In some possible implementations, the air guide groove is connected to the first surface and a second surface of the liquid injection safety device opposite to the first surface.

[0027] Through the technical solution of this embodiment, the air guide groove is designed to connect the opposite first surface and the second surface, which can facilitate the manufacture of the air guide groove in the liquid injection safety device and reduce the overall manufacturing cost of the liquid injection safety device.

[0028] In some possible embodiments, the battery's injection port is provided with a seal, and the injection channel is provided corresponding to the seal. The injection channel is used for the injection piece to pass through the seal so that the injection piece can inject electrolyte into the battery.

[0029] Through the technical solution of this embodiment, a seal is provided at the liquid filling port of the battery. During the liquid filling process, the liquid filling piece is used to pass through the seal to enter the interior of the battery for injection, which can further reduce the electrolyte contamination problem caused by electrolyte leakage during the liquid filling process and improve the manufacturing performance of the battery during the liquid filling process and the reliability of the battery.

[0030] In some possible implementations, the length L1 of the injection piece channel and the length L2 of the target segment in the injection piece satisfy: L1 ≥ 2×L2, wherein the target segment is located at the end of the injection piece facing the interior of the battery and outside the injection piece channel.

[0031] Through the technical solution of this embodiment, the injection piece channel can effectively constrain the injection piece, reducing the overall skewness of the injection piece, allowing the injection piece to enter the battery's injection port at an optimal angle, thereby reducing the interference and impact of the injection piece on the injection port's structural components. In addition, if the battery's injection port is provided with a seal, the injection piece can pass through the seal at an optimal angle, allowing the injection piece to effectively and quickly pass through the seal and enter the interior of the battery.

[0032] In some possible implementations, the diameter D1 of the liquid injection piece and the diameter D2 of the liquid injection piece channel satisfy: 0<(D2-D1) / D1≤0.15.

[0033] The technical solution of this embodiment can also reduce the overall skewness of the injection piece, so that the injection piece can enter the injection port of the battery at a better angle to reduce the interference and impact of the injection piece on the structural parts of the injection port.

[0034] In some possible implementations, the material of the liquid injection safety device includes a high molecular polymer.

[0035] Through the technical solution of this embodiment, the liquid injection safety device made of high molecular polymer can have better wear resistance, higher strength and higher corrosion resistance, so that it can be stably and reliably used in the battery injection process. While playing a role in safety protection of the battery, it causes less wear and impact on the battery.

[0036] In a second aspect, a battery injection method is provided, comprising: providing an injection safety device on the battery, wherein an injection member channel corresponding to an injection port of the battery is formed in the injection safety device; moving an injection member in the injection member channel so that the injection member enters the interior of the battery through the injection member channel and the injection port; and injecting electrolyte into the interior of the battery through the injection member.

[0037] In some possible embodiments, before the liquid injection safety device is provided on the battery, the liquid injection method further includes: providing a sealing member at the liquid injection port of the battery; the above-mentioned moving the liquid injection member in the liquid injection member channel so that the liquid injection member enters the interior of the battery through the liquid injection member channel and the liquid injection port, including: moving the liquid injection member in the liquid injection member channel so that the liquid injection member enters the interior of the battery through the liquid injection member channel and the sealing member.

[0038] In a third aspect, a battery injection system is provided, comprising: an injection piece and the injection safety device of the first aspect or any possible embodiment of the first aspect, wherein the injection safety device is configured to be arranged on the battery, and the injection piece is used to inject electrolyte into the battery through the injection safety device.

[0039] Through the technical solution of the embodiments of the present application, the battery is injected with an injection piece, which can reduce the problem of electrolyte contamination caused by electrolyte leakage during the injection process. Furthermore, during the injection process, the battery is protected by an injection safety device, and the injection piece can be more accurately passed through the injection port of the battery through the injection piece channel provided in the injection safety device, reducing the possibility of the injection piece deflecting and affecting the battery, thereby improving the manufacturing performance of the battery during the injection process and the reliability of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0041] FIG1 is a schematic structural diagram of a battery provided in one embodiment of the present application;

[0042] FIG2 is a schematic perspective view of a battery liquid injection safety device and a battery in cooperation with each other according to an embodiment of the present application;

[0043] FIG3 is a schematic cross-sectional view of the liquid injection safety device and the battery shown in FIG2 along the AA' direction;

[0044] FIG4 is another schematic perspective view of the battery liquid injection safety device and the battery provided in one embodiment of the present application in cooperation with each other;

[0045] FIG5 is a schematic cross-sectional view of a liquid injection safety device provided in one embodiment of the present application;

[0046] FIG6 is a schematic perspective view of the liquid injection safety device shown in FIG5 ;

[0047] FIG7 is another schematic perspective view of the battery liquid injection safety device and the battery provided in one embodiment of the present application;

[0048] FIG8 is another schematic cross-sectional view of the liquid injection safety device provided in one embodiment of the present application;

[0049] FIG9 is a schematic flow chart of a battery injection method according to an embodiment of the present application;

[0050] FIG10 is a schematic structural block diagram of a battery injection system provided in one embodiment of the present application.

[0051] In the drawings, the drawings are not drawn to scale.

[0052] Explanation of the accompanying drawings: 100-battery; 110-shell; 120-electrode assembly, 121-ear; 130-end cover assembly, 1301-negative end cover, 1302-positive end cover, 1311-electrode terminal, 1312-liquid filling port; 140-seal; 200-liquid filling safety device; 210-liquid filling channel, 220-first inclined guide groove, 230-second inclined guide groove, 240-first accommodating groove, 250-second accommodating groove, 260-air guide groove; 300-liquid filling part; 400-liquid filling device; 500-seal installation device; 1-liquid filling system of the battery. DETAILED DESCRIPTION

[0053] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0054] In the description of this application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly perpendicular, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0055] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0056] The term "and / or" in this application simply describes an association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0057] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0058] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0059] In the field of new energy, batteries are the main power source for electrical devices such as electric vehicles, ships or spacecraft, and their importance is self-evident. In the present application, the battery may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery or a magnesium-ion battery, etc., and the embodiments of the present application are not limited to this. In some related technologies, the battery may also be referred to as a battery cell or a battery core. In a specific implementation, one or more batteries may form a battery module or a battery pack to provide higher voltage and capacity to the electrical device. Optionally, the battery pack may include a casing for encapsulating one or more batteries. The casing can reduce the impact of liquid or other foreign matter on the charging or discharging of the battery.

[0060] In this application, the battery can be cylindrical, flat, rectangular, or other shapes, and the embodiments of this application do not limit this. In addition, batteries are generally divided into three types according to the packaging method: cylindrical batteries, prismatic batteries, and soft-pack batteries, and the embodiments of this application do not limit this.

[0061] The development of battery technology requires simultaneous consideration of multiple design factors. For example, to improve battery charge and discharge performance, various performance parameters must be considered, including energy density, cycle life, discharge capacity, and charge and discharge rate. Furthermore, battery manufacturing efficiency and performance are crucial to the promotion, application, and long-term development of batteries.

[0062] A battery generally consists of a housing, an electrode assembly, and an electrolyte. The housing holds the electrode assembly and electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. The electrolyte acts as an electrolyte, conducting ions between the positive and negative electrode sheets of the electrode assembly, enabling the battery to function properly. For lithium batteries, the electrolyte can include lithium salts and organic solvents.

[0063] During battery manufacturing, the battery filling process (i.e., the process of injecting electrolyte into the battery housing) is also a very important process. The production and manufacturing performance of this filling process will affect the final product performance of the battery. In some related technologies, during the battery filling process, a filling tool (such as a filling nozzle, etc.) is set at the edge of the battery's filling port, and the battery is filled into the filling port through this filling tool. If the filling tool does not make good contact with the edge of the filling port, there may be a risk of leakage during the filling process, resulting in electrolyte contamination problems, affecting subsequent battery manufacturing and battery product performance.

[0064] Therefore, in order to solve the above-mentioned electrolyte contamination problem, an injection tool such as an injection needle or injection tube can be used as an injection tool. The injection tool is inserted into the battery's injection port to enter the interior of the battery. The injection device can inject the electrolyte directly into the battery through the injection tool to reduce the possibility of electrolyte leakage to the outside of the battery. However, in this technical solution using an injection tool for injection, if the injection tool is directly used to pierce the battery, the injection tool may be misaligned and pierce other parts of the battery besides the injection port, such as the battery's electrode terminals, which will have a certain impact on the manufacturing performance and subsequent performance of the battery.

[0065] In view of this, an embodiment of the present application provides a battery injection safety device, which is applied to a battery with an injection port, and the injection safety device includes: an injection part channel, the injection part channel is arranged corresponding to the injection port of the battery, and the injection part channel is used to pass the injection part so that the injection part passes through the injection port of the battery to inject electrolyte into the interior of the battery. Through the technical solution of the embodiment of the present application, the injection part is used to inject liquid into the interior of the battery, which can reduce the problem of electrolyte contamination caused by electrolyte leakage during the injection process. Furthermore, the injection safety device is used to protect the battery during the injection process, and the injection part can pass through the injection port of the battery more accurately through the injection part channel provided in the injection safety device, reducing the possibility of the injection part deviation affecting the battery, thereby improving the manufacturing performance of the battery during the injection process and the reliability of the battery.

[0066] The technical solutions described in the embodiments of this application are applicable to various battery-powered devices, such as electric vehicles, electric bicycles, power tools, ships, and spacecraft, among which spacecraft include aircraft, rockets, space shuttles, and spacecraft. It should be understood that the technical solutions described in the embodiments of this application are not limited to the devices described above, but can also be applied to all battery-powered devices.

[0067] FIG1 shows a schematic structural diagram of a battery 100 provided in an embodiment of the present application.

[0068] As shown in FIG1 , battery 100 includes a housing 110, an electrode assembly 120, and an end cap assembly 130. Housing 110 and end cap assembly 130 form an outer shell or battery case. Housing 110 can be formed of a metal (e.g., aluminum). The shape of housing 110 depends on the shape of one or more electrode assemblies 120 combined. For example, housing 110 can be a hollow cylinder as shown in FIG1 .

[0069] The housing 110 has an opening, and the electrode assembly 120 is accommodated in the housing 110. The end cap assembly 130 is used to cover the opening to accommodate the electrode assembly 120 in the housing 110. The housing 110 and the end cap assembly 130 accommodate and protect the electrode assembly 120 and other components. The housing 110 is filled with an electrolyte, i.e., an electrolyte solution.

[0070] In the battery 100 provided in the embodiment of the present application, the electrode assembly 120 may be provided as a single one or multiple ones according to actual usage requirements. For example, in the embodiment shown in FIG1 , one electrode assembly 120 is provided in the battery 100 .

[0071] Continuing with FIG1 , the end cap assembly 130 includes a negative terminal cap 1301 and a positive terminal cap 1302. The negative terminal cap 1301 and the positive terminal cap 1302 respectively cover the opening of the housing 110 from both ends of the housing 110 to cover the electrode assembly 120 within the housing 110. A negative electrode terminal is provided on the negative terminal cap 1301, and a positive electrode terminal is provided on the positive terminal cap 1302. The electrode assembly 120 is provided with a tab 121, wherein the positive electrode terminal is electrically connected to the positive tab of the electrode assembly 120, and the negative electrode terminal is electrically connected to the negative tab of the electrode assembly 120.

[0072] In addition to the electrode terminals, the negative end cap 1301 or the positive end cap 1302 is also provided with a liquid injection port 1312. For example, in the embodiment shown in FIG1 , the liquid injection port 1312 may be provided at the center of the negative end cap 1301. During the liquid injection process of the battery 100, an external liquid injection tool may be placed at the liquid injection port 1312 to inject electrolyte into the battery 100.

[0073] It should be noted that in the battery 100 provided in the embodiment of the present application, in addition to the electrode terminals and the liquid injection port, the end cover assembly 130 may also be provided with other battery components, such as a pressure relief mechanism, etc. The embodiment of the present application does not limit the specific composition structure of the battery 100.

[0074] In addition, the battery 100 shown in FIG1 is illustrated using a cylindrical battery as an example. The battery provided in the present application may also be a square battery or a battery of other shapes. In the square battery, its components may be similar to the battery 100 shown in FIG1 above, and the shell of the square battery may be a hollow square shell.

[0075] Figure 2 shows a schematic perspective view of a battery liquid injection safety device 200 provided in an embodiment of the present application cooperating with a battery 100. Figure 3 shows a schematic cross-sectional view of the liquid injection safety device 200 and the battery 100 shown in Figure 2 along the AA' direction.

[0076] As shown in Figures 2 and 3, the liquid injection safety device 200 is applied to a battery 100 having a liquid injection port 1312. The liquid injection safety device 200 includes: an injection member channel 210, which is arranged corresponding to the liquid injection port 1312 of the battery 100, and the injection member channel 210 is used to pass the injection member 300 so that the injection member 300 passes through the liquid injection port 1312 of the battery 100 to inject electrolyte into the interior of the battery 100.

[0077] Optionally, in the embodiment of the present application, the injection piece 300 can be, for example, a liquid injection needle, a liquid injection tube, etc. Corresponding to the injection piece 300, the injection piece channel 210 can be a liquid injection needle channel or a liquid injection tube channel, etc.

[0078] Specifically, in an embodiment of the present application, the battery 100 may be equipped with a liquid injection safety device 200, which includes a liquid injection passage 210. Before liquid is injected into the battery 100, the liquid injection safety device 200 may be placed on the wall of the battery 100 where the liquid injection port 1312 is located. The liquid injection passage 210 in the liquid injection safety device 200 may correspond to the liquid injection port 1312. Then, the liquid injection member 300 is passed through the liquid injection passage 210 (for example, by inserting a liquid injection needle into the liquid injection needle passage). The liquid injection member 300 can pass through the liquid injection passage 210 to reach the liquid injection port 1312 of the battery 100. The liquid injection member 300 can then enter the interior of the battery 100 through the liquid injection port 1312 to inject liquid into the interior of the battery 100.

[0079] In some examples, as shown in Figures 2 and 3, the liquid injection port 1312 of the battery 100 can be disposed on the top wall of the battery 100, and the liquid injection safety device 200 can be correspondingly disposed above the battery 100, for example, on the top wall of the battery 100. The liquid injection member 300 can be coaxially disposed with the liquid injection member channel 210 in the liquid injection safety device 200. The liquid injection member 300 can move in a vertical direction, pass through the liquid injection member channel 210, and then vertically enter the liquid injection port 1312 of the battery 100.

[0080] In the embodiment of the present application, the length of the liquid injection passage 210 in the liquid injection safety device 200 needs to be shorter than the overall length of the liquid injection piece 300, so that the liquid injection piece 300 can pass through the liquid injection passage 210 and enter the interior of the battery 100. In addition, the diameter of the liquid injection passage 210 also needs to match the diameter of the liquid injection piece 300, for example, slightly larger than the diameter of the liquid injection piece 300, so that the liquid injection piece 300 can pass through the liquid injection passage 210 smoothly without getting stuck, and the liquid injection piece 300 has a good correspondence with the liquid injection port 1312 of the battery 100.

[0081] Through the technical solution of the embodiment of the present application, the liquid injection piece 300 is used to inject liquid into the interior of the battery 100, which can reduce the problem of electrolyte contamination caused by electrolyte leakage during the injection process. Furthermore, the liquid injection safety device 200 is used to protect the battery 100 during the injection process. The liquid injection piece 300 can pass through the liquid injection port of the battery 100 more accurately through the liquid injection piece channel 210 provided in the liquid injection safety device 200, reducing the possibility of the liquid injection piece 300 deflecting and affecting the battery 100, thereby improving the manufacturing performance of the battery 100 during the injection process and the reliability of the battery 100.

[0082] FIG4 shows another schematic structural diagram of the liquid injection safety device 200 and the battery 100 provided in an embodiment of the present application cooperating with each other.

[0083] As shown in FIG. 4 , in some possible implementations, the liquid filling safety device 200 may include a liquid filling safety cap, which is configured to be buckled onto the battery 100 .

[0084] Specifically, in this embodiment, the liquid filling safety cap may include a cover body and an annular wall, wherein the cover body is arranged corresponding to the wall where the liquid filling port 1312 in the battery 100 is located, and the annular wall is connected to the side of the cover body facing the battery 100. After the liquid filling safety cap is buckled on the battery 100, the annular wall can be arranged around the battery 100.

[0085] The liquid injection member channel 210 is formed in the cover of the liquid injection safety cap and extends through the cover. The axis of the liquid injection member channel 210 can be perpendicular to the wall of the liquid injection port 1312 in the battery 100, so that the liquid injection member 300 can pass vertically through the liquid injection port 1312 to accurately enter the interior of the battery 100 for liquid injection.

[0086] In some embodiments, as shown in FIG. 4 , when the liquid injection port 1312 is formed at the center of the wall where the liquid injection port 1312 is located, the liquid injection member channel 210 may also be correspondingly formed at the center of the cover of the liquid injection safety cap.

[0087] Through the technical solution of this embodiment, the liquid injection safety device 200 is designed as a liquid injection safety cap, which is conducive to the liquid injection safety cap being fixed to the battery 100 more conveniently and reliably. The positional relationship between the liquid injection safety cap and the battery 100 is relatively fixed, so that the liquid injection part 300 can enter the interior of the battery 100 more accurately through the liquid injection safety cap, which is conducive to further improving the manufacturing performance of the battery 100 during the liquid injection process.

[0088] FIG5 shows a schematic cross-sectional view of the liquid injection safety device 200 provided in an embodiment of the present application.

[0089] As shown in Figure 5, in the liquid injection safety device 200 provided in an embodiment of the present application, a first inclined guide groove 220 is formed at one end of the liquid injection part channel 210 away from the battery 100, and the inclined surface of the first inclined guide groove 220 is inclined relative to the axial direction of the liquid injection part channel 210, and the first inclined guide groove 220 is used to guide the liquid injection part 300 into the liquid injection part channel 210.

[0090] Specifically, in the embodiment of the present application, the end of the injection member channel 210 away from the battery 100 can be the inlet end of the injection member channel 210, that is, the injection member 300 enters from the inlet end of the injection member channel 210. Providing a first inclined guide groove 220 at the inlet end of the injection member channel 210 can increase the diameter of the injection member channel 210 at the inlet end, facilitating a more convenient and smooth entry of the injection member 300 into the injection member channel 210. In the case where the injection member 300 is an injection needle, the probability of the injection member 300 getting stuck at the inlet end of the injection member channel 210 can be effectively reduced, thereby further improving the manufacturing performance of the battery 100 during the injection process.

[0091] Optionally, as an example and not a limitation, the first inclined guide groove 220 may include a conical guide groove. Specifically, the first inclined guide groove 220 may have a truncated cone structure, with a conical side surface. The upper base of the first inclined guide groove 220 is the side away from the battery 100, and the lower base of the first inclined guide groove 220 is the side facing the battery 100. The upper base area of ​​the first inclined guide groove 220 may be larger than the lower base area.

[0092] Through the technical solution of this embodiment, the first inclined guide groove 220 is designed as a conical guide groove, so that the first inclined guide groove 220 can have a smooth surface, thereby facilitating a good guiding effect on the injection part 300, further reducing the probability of the injection part 300 getting stuck in the injection part channel 210, and improving the manufacturing performance of the battery 100 during the injection process.

[0093] In some alternative embodiments, the first inclined guide groove 220 may be designed as a truncated cone structure with a conical surface, or may be other types of structures such as a truncated cone, which is not specifically limited in the embodiments of the present application.

[0094] FIG. 6 shows a schematic perspective view of the liquid injection safety device 200 shown in FIG. 5 .

[0095] 5 and 6 , in the case where the liquid filling safety device 200 is a liquid filling safety cap, a second inclined guide groove 230 may be provided at one end of the liquid filling safety cap that is buckled with the battery 100. The inclined surface of the second inclined guide groove 230 is inclined relative to the wall of the battery 100 (not shown in FIG. 5 and FIG. 6 ), and the second inclined guide groove 230 is used to guide the battery 100 to be buckled with the liquid filling safety cap.

[0096] Specifically, in this embodiment, the end of the liquid filling safety cap that is engaged with the battery 100 can be the end of the liquid filling safety cap where the annular wall is located, and the inner circumferential surface of the annular wall can be provided with a second bevel guide groove 230. The second bevel guide groove 230 can expand the inner diameter of the liquid filling safety cap, thereby allowing the battery 100 to have a larger displacement margin. Even if the battery 100 is not completely aligned with the liquid filling safety cap, but has a certain positional offset, the liquid filling safety cap can still be smoothly engaged with the battery 100 through the second bevel guide groove 230, thereby further improving the production efficiency of the battery 100 during the liquid filling process.

[0097] Optionally, by way of example and not limitation, the second inclined guide groove 230 may also comprise a conical guide groove. Specifically, the second inclined guide groove 230 may be, for example, a truncated cone structure with a conical side surface. Furthermore, the upper base of the second inclined guide groove 230 faces the injection passage 210, while the lower base faces away from the injection passage 210. The upper base area of ​​the second inclined guide groove 230 may be smaller than the lower base area.

[0098] Through the technical solution of this embodiment, the second inclined guide groove 230 is designed as a conical guide groove, so that the second inclined guide groove 230 has a smooth surface, thereby facilitating a good guiding effect on the battery 100, so that the battery 100 can be stably and reliably engaged with the liquid filling safety cap, further improving the manufacturing performance of the battery 100 during the liquid filling process.

[0099] 5 and 6 , the liquid injection safety device 200 may be disposed corresponding to the wall where the electrode terminal 1311 of the battery 100 is located (not shown in FIG. 5 and FIG. 6 ), and a first accommodating groove 240 for accommodating the electrode terminal 1311 is formed in the liquid injection safety device 200 .

[0100] Specifically, in this embodiment, the electrode terminal 1311 and the liquid injection port 1312 of the battery 100 may be located on the same wall of the battery 100. In this case, the liquid injection safety device 200 may be disposed on the wall of the battery 100 where the liquid injection port 1312 and the electrode terminal 1311 are located. The liquid injection safety device 200 has a first receiving groove 240 formed on the surface of the wall facing the liquid injection port 1312 and the electrode terminal 1311, thereby facilitating the reception of the electrode terminal 1311 of the battery 100, providing good protection for the electrode terminal 1311, and enabling accurate alignment of the liquid injection safety device 200 and the battery 100, thereby improving the correspondence between the liquid injection passage 210 in the liquid injection safety device 200 and the liquid injection port 1312 in the battery 100, and further improving the manufacturing performance of the battery 100 during the liquid injection process.

[0101] Optionally, the shape of the first receiving groove 240 matches the shape of the electrode terminal 1311 .

[0102] As an example, when the electrode terminal 1311 is a ring-shaped protruding electrode terminal, the first receiving groove 240 may be a ring-shaped receiving groove.

[0103] When the first receiving groove 240 and the electrode terminal 1311 match each other, they achieve high alignment accuracy and a tight fit, enhancing the connection stability between the liquid injection safety device 200 and the battery 100. Furthermore, the gap between the first receiving groove 240 and the electrode terminal 1311 is small, providing good protection for the electrode terminal 1311 and reducing interference and impact of the external environment on the electrode terminal 1311 during the liquid injection process.

[0104] 5 , in some embodiments, an air guide groove 260 is provided in the liquid filling safety device 200 , and the air guide groove 260 is connected to the first surface of the liquid filling safety device 200 attached to the battery 100 and the surface of the liquid filling safety device 200 facing the external environment.

[0105] Specifically, when the liquid filling safety device 200 is correspondingly arranged on the battery 100, for example, when the liquid filling safety device 200 is a liquid filling safety cap, and the liquid filling safety cap is buckled on the battery 100, most of the area of ​​the surface of the liquid filling safety device 200 facing the battery 100 can be attached to the wall of the battery 100, so that the liquid filling safety device 200 and the battery 100 have a high degree of fit and a stable connection.

[0106] When the first surface of the liquid injection safety device 200 is attached to the battery 100, the gap between the first surface and the battery 100 is small, so a small pressure or even a negative pressure is easily formed between the two. After the liquid injection is completed, when the liquid injection safety device 200 is separated from the battery 100, the small pressure or even the negative pressure between the two will make it difficult for the liquid injection safety device 200 to be separated from the battery 100, thereby affecting the production efficiency of the battery 100.

[0107] In view of this, in an embodiment of the present application, an air guide groove 260 is provided in the liquid injection safety device 200, and the air guide groove 260 is connected to the first surface of the liquid injection safety device 200 attached to the battery 100 and the surface of the liquid injection safety device 200 facing the external environment. The air guide groove 260 can introduce atmospheric gas in the external environment into the gap between the first surface of the liquid injection safety device 200 and the battery 100, thereby increasing the pressure between the liquid injection safety device 200 and the battery 100, facilitating the separation of the liquid injection safety device 200 from the battery 100, and thereby improving the production efficiency of the battery 100.

[0108] In some possible implementations, the air guide groove 260 is connected to a first surface of the liquid filling safety device 200 attached to the battery 100 and a second surface of the liquid filling safety device 200 opposite to the first surface.

[0109] Specifically, in this embodiment, the second surface opposite to the first surface is a surface of the liquid injection safety device 200 away from the battery 100 , and the second surface is one of the surfaces of the liquid injection safety device 200 facing the external environment.

[0110] In this embodiment, the air guide groove 260 can be a linear air guide channel that penetrates the liquid injection safety device 200. The radial dimension of the air guide channel can be designed to be smaller. For example, the radial dimension of the air guide channel can be smaller than the radial dimension of the liquid injection passage 210. When the radial dimension of the air guide channel is designed to be smaller, the possibility of interference from the external environment contacting the battery 100 through the air guide channel can be reduced, thereby reducing the interference and impact of the external environment on the battery 100.

[0111] Through the technical solution of this embodiment, the air guide groove 260 is designed to connect the opposite first surface and the second surface, which can facilitate the manufacture of the air guide groove 260 in the liquid injection safety device 200 and reduce the overall manufacturing cost of the liquid injection safety device 200.

[0112] In some alternative embodiments, the air guide groove 260 may also be designed as a curved or bent straight air guide channel. The embodiment of the present application does not limit the morphological design of the air guide groove 260.

[0113] In addition, the air guide groove 260 can be connected to the first surface and the surface facing the external environment in the liquid injection safety device 200, and can also be connected to the first surface and the liquid injection member channel 210. Specifically, after the liquid injection member 300 is removed from the liquid injection member channel 210, the liquid injection member channel 210 can also be connected to the atmospheric environment. When the air guide groove 260 is connected to the first surface and the liquid injection member channel 210, the air guide groove 260 can also guide atmospheric gas to the first surface.

[0114] In some possible embodiments, as shown in FIG5 , the number of the above-mentioned air guide grooves 260 can be multiple, and the multiple air guide grooves 260 can be respectively arranged on both sides of the liquid injection channel 210, thereby further reducing the possibility of forming a low pressure or even a negative pressure between the liquid injection safety device 200 and the battery 100.

[0115] Figure 7 shows another schematic structural diagram of the liquid injection safety device 200 provided in an embodiment of the present application in cooperation with the battery 100. Optionally, the liquid injection safety device 200 in the embodiment shown in Figure 7 can have the same structure as the liquid injection safety device 200 in the embodiments shown in Figures 5 and 6 above.

[0116] As shown in Figure 7, in an embodiment of the present application, the injection port 1312 of the battery 100 is provided with a seal 140, and the injection channel 210 is provided corresponding to the seal 140. The injection channel 210 is used to pass through the injection part 300 so that the injection part 300 passes through the seal 140 to inject electrolyte into the interior of the battery 100.

[0117] Specifically, the seal 140 is a structural member with a sealing effect, and its outer dimensions can be adapted to the liquid filling port 1312 of the battery 100, thereby effectively sealing the liquid filling port 1312 of the battery 100. In addition, the seal 140 can have a certain hardness to improve the performance of the seal 140 and reduce the impact of external stress on the seal 140.

[0118] Optionally, in some embodiments, when the injection member 300 is an injection needle, the needle tip of the injection needle can pierce the sealing member 140 under a certain pressure.

[0119] In addition, the sealing member 140 may also be made of an elastic material. After the liquid injection member 300 is pulled out of the sealing member 140 , the sealing member 140 may be elastically deformed to reduce the gap formed by the liquid injection member 300 in the sealing member 140 .

[0120] In this embodiment, after the liquid injection member 300 is withdrawn from the sealing member 140, the elastic deformation of the sealing member 140 can make the gap in the sealing member 140 very small or even negligible. This very small gap will basically not affect the sealing of the battery 100. Therefore, in addition to improving the manufacturing performance of the battery 100 during the liquid injection process, the sealing member 140 can also be reused as a sealant during normal use of the battery 100 to seal the liquid injection port 1312 of the battery 100. The technical solution of this embodiment is conducive to comprehensively improving the manufacturing performance and use performance of the battery 100 during the liquid injection process.

[0121] As an example and not a limitation, the material of the sealing member 140 may include rubber. The rubber material may have good sealing performance, a certain hardness, and good elastic deformation performance.

[0122] In some specific implementations, the seal 140 can be a plastic nail. The seal 140 can be shaped like a nail, having a nail cap and a nail body. The plastic nail can be easily and stably installed at the liquid injection port 1312 of the battery 100 to provide a good sealing effect for the battery 100.

[0123] In the technical solution of the embodiment of the present application, the filling port 1312 of the battery 100 is provided with a seal 140. During the filling process, the filling part 300 is used to pass through the seal 140 to enter the interior of the battery 100 for filling. This can further reduce the electrolyte contamination problem caused by electrolyte leakage during the filling process, and improve the manufacturing performance of the battery 100 during the filling process and the reliability of the battery 100.

[0124] In order to cooperate with the sealing member 140 , as shown in FIG. 5 and FIG. 7 , the liquid injection safety device 200 may be provided with a second receiving groove 250 , and the second receiving groove 250 is used to receive the sealing member 140 .

[0125] Specifically, the second receiving groove 250 can be disposed at the end of the liquid injection passage 210 that faces the battery 100, that is, the second receiving groove 250 is disposed at the outlet end of the liquid injection passage 210, thereby accommodating the sealing member 140 corresponding to the liquid injection passage 210. The shape of the second receiving groove 250 can be designed to match the sealing member 140, thereby providing good protection for the sealing member 140 and reducing interference and impact of the external environment on the sealing member 140 during the liquid injection process.

[0126] FIG8 shows another schematic cross-sectional view of the liquid injection safety device 200 provided in an embodiment of the present application.

[0127] Alternatively, as shown in FIG8 , the length L1 of the injection member channel 210 and the length L2 of the target segment in the injection member 300 may satisfy the following relationship: L1 ≥ 2×L2, wherein the target segment is located at the end of the injection member 300 facing the interior of the battery 100 and outside the injection member channel 210. For example, when the injection member 300 is an injection needle, the target segment is located at the needle tip end of the injection needle and outside the injection member channel 210.

[0128] Optionally, when a first inclined guide groove 220 is provided at the inlet end of the liquid injection member channel 210 , the length L1 of the liquid injection member channel 210 may include the depth of the first inclined guide groove 220 .

[0129] Specifically, in this embodiment, the length of the injection piece 300 in the injection piece channel 210 is the length L1 of the injection piece channel 210, and the partial section of the injection piece 300 in the injection piece channel 210 can be constrained by the injection piece channel 210 to control the skewness of the injection piece 300.

[0130] When the injection piece 300 is a liquid injection needle, the needle tip of the injection piece 300 will pass through the liquid injection piece channel 210 and enter the interior of the battery 100. Therefore, a portion of the needle tip end of the injection piece 300 (i.e., the target segment) will be located outside the liquid injection piece channel 210, and at least a portion of the target segment is located inside the battery 100. When the liquid injection port 1312 of the battery 100 is provided with a sealing member 140, at least a portion of the target segment is located within the sealing member 140.

[0131] When the length L1 of the injection member channel 210 is large and the length L2 of the target section of the injection member 300 outside the injection member channel 210 is small, for example, when L1 ≥ 2 × L2, the injection member channel 210 can effectively constrain the injection member 300, reducing the overall skewness of the injection member 300, allowing the injection member 300 to enter the injection port 1312 of the battery 100 at a preferred angle, thereby reducing the interference and impact of the injection member 300 on the structural components of the injection port 1312. In addition, when the injection port 1312 of the battery 100 is provided with a seal 140, the injection member 300 can pass through the seal 140 at a preferred angle, thereby allowing the injection member 300 to effectively and quickly pass through the seal 140 to enter the interior of the battery 100.

[0132] Optionally, referring to FIG. 8 , the diameter D1 of the liquid injection piece 300 and the diameter D2 of the liquid injection piece channel 210 satisfy the relationship: 0<(D2−D1) / D1≤0.15.

[0133] Specifically, in this embodiment, the diameter D2 of the liquid injection member channel 210 is larger than the diameter D1 of the liquid injection member 300 , ie, D2 - D1 > 0, so that the liquid injection member 300 can smoothly pass through the liquid injection member channel 210 .

[0134] Furthermore, the difference (D2-D1) between the diameter D2 of the injection member channel 210 and the diameter D1 of the injection member 300 also satisfies (D2-D1) / D1≤0.15. In this case, the difference between the diameter D2 of the injection member channel 210 and the diameter D1 of the injection member 300 can be small, thereby allowing the injection member channel 210 to effectively constrain the injection member 300. A highly skewed injection member 300 cannot pass through the injection member channel 210 and enter the interior of the battery 100. Through the technical solution of this embodiment, the overall skewness of the injection member 300 can be reduced, allowing the injection member 300 to enter the injection port 1312 of the battery 100 at a preferred angle, thereby reducing the interference and impact of the injection member 300 on the structural components of the injection port 1312.

[0135] In some possible implementations, the material of the liquid injection safety device 200 may include a polymer, such as, but not limited to, polyetheretherketone (PEEK).

[0136] Specifically, to ensure the battery 100 has excellent operational stability and reliability, the housing of the battery 100 is generally made of a metal material. To reduce wear and tear on the battery 100 caused by contact between the liquid injection safety device 200 and the battery 100, the material of the liquid injection safety device 200 can be a non-metallic polymer. This polymer exhibits excellent wear resistance, high strength, and high corrosion resistance, allowing for stable and reliable use during the liquid injection process of the battery 100, while providing safety protection for the battery 100 while minimizing any impact on the battery 100.

[0137] In the embodiment shown in Figure 8, the liquid filling safety device 200 may be the liquid filling safety cap in the embodiments shown in Figures 5 to 7. For the relevant structural features of the liquid filling safety device 200, reference may be made to the relevant descriptions of any of the embodiments shown in Figures 5 to 7 above.

[0138] Optionally, in the liquid filling safety cap, a first bevel guide groove 220 is formed at the end of the liquid filling passage 210 away from the battery 100. Additionally, a second bevel guide groove 230 may be provided at the end of the liquid filling safety cap that engages with the battery 100. Both the first bevel guide groove 220 and the second bevel guide groove 230 may be conical guide grooves.

[0139] Optionally, the liquid filling safety cap is snapped onto the wall of the battery 100 where the electrode terminal 1311 and the liquid filling port 1312 are located, wherein the liquid filling port 1312 is provided with a seal 140. The liquid filling safety cap is formed with a first receiving groove 240 for accommodating the electrode terminal 1311 and a second receiving groove 250 for accommodating the seal 140. The shapes of the first receiving groove 240 and the second receiving groove 250 can match the electrode terminal 1311 and the seal 140, so that the liquid filling safety cap and the battery 100 have a better fit. The first receiving groove 240 and the second receiving groove 250 can also achieve accurate alignment of the liquid filling safety cap and the battery 100, so that the liquid filling passage 210 in the liquid filling safety cap can be more accurately aligned with the seal 140 of the battery 100.

[0140] In addition, the liquid filling safety cap may also include an air guide groove 260, which connects the first surface of the liquid filling safety device 200 attached to the battery 100 and the surface of the liquid filling safety device 200 facing the external environment. The air guide groove 260 can guide atmospheric gas from the external environment into the gap between the first surface of the liquid filling safety device 200 and the battery 100, thereby increasing the pressure between the liquid filling safety device 200 and the battery 100, facilitating the separation of the liquid filling safety device 200 from the battery 100, and thereby improving the production efficiency of the battery 100. Optionally, there can be multiple air guide grooves 260, each of which can be provided on both sides of the liquid filling passage 210.

[0141] The battery liquid filling safety device provided by the present application is described above with reference to Figures 2 to 8 . The battery liquid filling method provided by the present application is described below with reference to Figure 9 . It is understood that the relevant technical solutions of the liquid filling method in the following embodiments may correspond to the relevant technical solutions of the liquid filling safety device in the above embodiments. For specific details, please refer to the relevant description of the above embodiments and will not be elaborated on below.

[0142] FIG9 shows a schematic flow chart of a battery liquid injection method 10 provided in an embodiment of the present application.

[0143] As shown in FIG9 , the battery injection method 10 may include the following steps.

[0144] S101: a liquid injection safety device is provided on the battery, wherein a liquid injection passage corresponding to the liquid injection port of the battery is formed in the liquid injection safety device.

[0145] S102: moving the injection piece in the injection piece channel so that the injection piece enters the interior of the battery through the injection piece channel and the injection port.

[0146] S103: injecting electrolyte into the battery through the injection piece.

[0147] Specifically, in the embodiments of the present application, the liquid injection method 10 can be applied to the battery 100 and the liquid injection safety device 200 in any of the above embodiments. The liquid injection method 10 can be performed by a liquid injection system in a battery production line. The liquid injection system can include multiple liquid injection devices to facilitate the execution of multiple steps in the liquid injection method 10.

[0148] In step S101, the battery production line may be equipped with an installation device for installing the liquid injection safety device 200. The installation device may install the liquid injection safety device 200 on the battery 100. The liquid injection safety device 200 may be formed with a liquid injection passage 210 corresponding to the liquid injection port 1312 of the battery 100. Optionally, the design of the liquid injection safety device 200 and the liquid injection passage 210 may refer to the description of any of the embodiments shown in Figures 2 to 8 above.

[0149] In step S102, the battery production line may be equipped with a control device for the liquid injection member, which controls the movement of the liquid injection member 300. If the liquid injection member 300 is a liquid injection needle, the liquid injection member control device can insert the liquid injection needle into the liquid injection member channel 210 in the liquid injection safety device 200, so that the liquid injection needle can enter the interior of the battery 100 through the liquid injection member channel 210. Optionally, the design of the liquid injection member channel 210 and the liquid injection member 300 can also be referred to the relevant description of any of the embodiments shown in Figures 2 to 8 above.

[0150] In step S103, the battery production line may be equipped with a liquid injection device, which can inject electrolyte into the interior of the battery 100 through the liquid injection piece 300. Optionally, the liquid injection device can be understood as an electrolyte supply device, which is connected to the liquid injection piece 300. The liquid injection piece 300 is formed with a liquid injection channel, and the electrolyte in the liquid injection device flows into the interior of the battery 100 through the liquid injection channel in the liquid injection piece 300. Optionally, a switch may be provided at the connection between the liquid injection device and the liquid injection piece 300. When the switch is controlled to be turned on, the liquid injection device and the liquid injection channel in the liquid injection piece 300 are connected to each other. When the switch is controlled to be turned off, the liquid injection device and the liquid injection channel in the liquid injection piece 300 are disconnected from each other.

[0151] In some possible embodiments, before the above step S101, the injection method 10 may further include: setting a seal 140 at the injection port 1312 of the battery 100. In this case, the above step S102 may include: moving the injection part 300 in the injection part channel 210 so that the injection part 300 enters the interior of the battery 100 through the injection part channel 210 and the seal 140 at the injection port 1312.

[0152] Optionally, the relevant technical solutions of the sealing member 140 can also refer to the relevant description of the embodiment shown in Figure 7. When the sealing member 140 is provided at the liquid filling port 1312 of the battery 100, the battery 100 can have better liquid filling reliability.

[0153] In some embodiments, before step S103 , that is, before injecting electrolyte into the interior of the battery 100 through the liquid injection piece 300 , the internal gas of the battery 100 may be discharged through the liquid injection piece 300 .

[0154] Through the technical solution of this embodiment, the gas inside the battery 100 can be first discharged using the liquid injection part 300, and then the electrolyte can be injected into the interior of the battery 100 through the liquid injection part 300. The discharged internal gas will not occupy the storage space inside the battery 100, which is beneficial to improving the energy density and product performance of the battery 100.

[0155] Optionally, the internal gas of the battery 100 can be extracted through the liquid injection piece 300. Specifically, the battery production line is equipped with a gas extraction device, which is connected to the liquid injection piece 300 and extracts the internal gas of the battery 100 through the liquid injection piece 300. In some examples, after the gas extraction device extracts the internal gas of the battery 100, a negative pressure can be formed inside the battery 100, and the electrolyte in a normal pressure environment can be quickly injected into the interior of the battery 100 through the liquid injection piece 300. This not only helps to increase the injection rate to improve the manufacturing and processing efficiency of the battery 100, but also reduces the possibility of problems such as electrolyte leakage or splashing during the injection process, thereby further improving the manufacturing performance of the battery 100 during the injection process.

[0156] Optionally, the internal gas of the battery 100 includes gas generated during the closed-cell formation process of the battery 100 .

[0157] In the technical solution provided in the embodiment, the reaction gas generated by the battery 100 during the closed-end formation process can be first extracted through the liquid injection part 300, and then the electrolyte can be injected into the battery 100 through the liquid injection part 300. On the one hand, the capacity of the electrolyte injected into the battery 100 can be increased to improve the overall performance of the battery. On the other hand, the gas in the battery 100 can be reduced to reduce the internal air pressure of the battery and reduce the possibility of battery explosion.

[0158] The present invention also provides a battery liquid injection system. As shown in FIG10 , the battery liquid injection system 1 may include a liquid injection component 300 and a liquid injection safety device 200 .

[0159] Specifically, the liquid injection safety device 200 may be configured to be disposed on the battery 100 , and the liquid injection member 300 is used to inject electrolyte into the battery 100 through the liquid injection safety device 200 .

[0160] Optionally, as shown in FIG10 , the battery injection system 1 may further include an injection device 400 , which is connected to the injection piece 300 and is used to inject electrolyte into the interior of the battery 100 through the injection piece 300 .

[0161] Optionally, when a seal 140 is provided at the liquid filling port 1312 of the battery 100 , as shown in FIG10 , the liquid filling system 1 of the battery may further include: a seal installation device 500 , which is used to obtain the seal 140 and set the seal 140 at the liquid filling port 1312 of the battery 100 .

[0162] It can be understood that the battery filling system 1, in addition to the various filling devices shown in Figure 10, can further include other auxiliary equipment, for example, multiple control devices for controlling the filling safety device 200, the filling part 300 and the filling device 400, etc.

[0163] Although this application has been described with reference to preferred embodiments, various modifications may be made thereto and equivalent components may be substituted without departing from the scope of this application. In particular, the various technical features described in the various embodiments may be combined in any manner, provided no structural conflicts exist. This application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A battery injection safety device, characterized in that: Applied to a battery (100) having a liquid injection port (1312), the liquid injection safety device comprises: a liquid injection passage (210), the liquid injection passage (210) being arranged corresponding to the liquid injection port (1312) of the battery (100), the liquid injection passage (210) being used to pass through the liquid injection passage (300), so that the liquid injection passage (300) passes through the liquid injection port (1312) of the battery (100) to inject electrolyte into the interior of the battery (100); The liquid injection safety device comprises a liquid injection safety cap, the liquid injection safety cap is configured to be buckled on the battery (100), the liquid injection safety cap comprises a cover body and an annular wall, the cover body is arranged corresponding to the wall where the liquid injection port (1312) in the battery (100) is located, and the annular wall is connected to a side of the cover body facing the battery (100); One end of the liquid filling safety cap buckled on the battery (100) is provided with a second inclined guide groove (230), the inclined surface of the second inclined guide groove (230) is inclined relative to the wall of the battery (100), and the second inclined guide groove (230) is used to guide the liquid filling safety cap to buckle on the battery (100).

2. The liquid injection safety device according to claim 1, characterized in that: A first inclined guide groove (220) is formed at one end of the liquid injection member channel (210) away from the battery (100), the inclined surface of the first inclined guide groove (220) being arranged to be inclined relative to the axial direction of the liquid injection member channel (210), and the first inclined guide groove (220) is used to guide the liquid injection member (300) to enter the liquid injection member channel (210).

3. The liquid injection safety device according to claim 2, characterized in that: The first inclined surface guide groove (220) comprises a conical surface guide groove.

4. The liquid injection safety device according to claim 1, characterized in that: The second inclined surface guide groove (230) comprises a conical surface guide groove.

5. The liquid injection safety device according to any one of claims 1 to 3, characterized in that: The liquid injection safety device is arranged corresponding to the wall where the electrode terminal (1311) of the battery (100) is located, and a receiving groove for receiving the electrode terminal (1311) is formed in the liquid injection safety device.

6. The liquid injection safety device according to claim 5, characterized in that: The shape of the receiving groove matches the shape of the electrode terminal (1311).

7. The liquid injection safety device according to any one of claims 1 to 3, characterized in that: An air guide groove (260) is provided in the liquid injection safety device, and the air guide groove (260) is connected to a first surface of the liquid injection safety device attached to the battery (100) and a surface of the liquid injection safety device facing the external environment.

8. The liquid injection safety device according to claim 7, characterized in that: The air guide groove (260) is connected to the first surface and a second surface of the liquid injection safety device that is opposite to the first surface.

9. The liquid injection safety device according to any one of claims 1 to 3, characterized in that: The liquid injection port (1312) of the battery (100) is provided with a sealing member (140), the liquid injection member channel (210) is provided corresponding to the sealing member (140), and the liquid injection member channel (210) is used to pass through the liquid injection member (300) so that the liquid injection member (300) passes through the sealing member (140) to inject electrolyte into the interior of the battery (100).

10. The liquid injection safety device according to any one of claims 1 to 3, characterized in that: The length L1 of the injection piece channel (210) and the length L2 of the target segment in the injection piece (300) satisfy: L1≥2×L2, wherein the target segment is located at one end of the injection piece (300) facing the inside of the battery (100) and is located outside the injection piece channel (210).

11. The liquid injection safety device according to any one of claims 1 to 3, characterized in that: The diameter D1 of the liquid injection piece (300) and the diameter D2 of the liquid injection piece channel (210) satisfy the relationship: 0<(D2-D1) / D1≤0.

15.

12. The liquid injection safety device according to any one of claims 1 to 3, characterized in that: The material of the liquid injection safety device includes high molecular polymer.

13. A battery injection method, characterized in that: include: The battery is provided with a liquid injection safety device as claimed in any one of claims 1 to 12, wherein a liquid injection member channel corresponding to the liquid injection port of the battery is formed in the liquid injection safety device; Moving the injection piece in the injection piece channel so that the injection piece enters the interior of the battery through the injection piece channel and the injection port; The electrolyte is injected into the battery through the injection piece.

14. A battery injection system, characterized in that: include: Injection parts and The liquid injection safety device according to any one of claims 1 to 12, wherein the liquid injection safety device is configured to be disposed on the battery, and the liquid injection piece is used to inject electrolyte into the battery through the liquid injection safety device.

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