Liquid injection method, liquid injection apparatus, and storage medium

Abstract

The application discloses a liquid injection method, a liquid injection device and a storage medium, and relates to the technical field of batteries. The liquid injection method comprises the following steps: in the case that the inside of a battery is vacuumized by a vacuumizing device and the inside pressure value of the battery reaches a first preset pressure value, closing an air outlet channel, controlling a liquid injection device to inject liquid into the battery through a liquid injection port; when the liquid injection device is controlled to inject liquid into the battery, keeping the liquid injection port of the battery downward; in the case that the liquid injection amount of the battery reaches a target amount, controlling the liquid injection device to stop injecting liquid, and controlling the battery to rotate by a first preset angle so that the air outlet port faces upward. The technical scheme of the application can relieve the problem of poor wetting or interface abnormality of the battery cell assembly caused by the fact that the discharge direction of the gas in the pores of the battery cell assembly is opposite to the penetration direction of the electrolyte.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a liquid injection method, liquid injection device and storage medium. Background Technology

[0002] Battery production involves multiple technological steps, and electrolyte injection is one of them. After battery assembly, a vacuum system is used to create a negative pressure inside the battery, allowing electrolyte to be injected through an inlet on the battery casing. However, even after vacuuming, residual gases may remain inside the battery. These gases are primarily found in the space between the casing and the battery cells, as well as in the pores within the cells. Gas in the space can generally be expelled through the negative pressure, while gas in the pores requires the wetting and replacement of the electrolyte.

[0003] In related technologies, the direction of gas discharge from the pores inside the battery cell is contrary to the direction of electrolyte permeation. This can easily lead to the gas in the pores being trapped in the central area of ​​the battery cell by the electrolyte, forming a "liquid seal" phenomenon. This prevents the gas from being effectively discharged, which may cause poor wetting of the battery cell and abnormal interface, thereby increasing the risk of low capacity and accelerated degradation during battery use. Summary of the Invention

[0004] In view of the above problems, this application provides a liquid injection method, liquid injection device and storage medium, which aims to alleviate the problem of poor wetting or interface abnormality of the battery cell assembly caused by the gas discharge direction in the pores of the battery cell assembly being contrary to the electrolyte permeation direction.

[0005] In a first aspect, this application provides a liquid injection method applied to a liquid injection device including a liquid injection apparatus and a vacuuming apparatus, for injecting electrolyte into the interior of a battery, wherein a liquid injection port and a vacuuming port are provided on one side of the battery, the liquid injection apparatus is connected to the liquid injection port through a liquid injection channel, and the vacuuming apparatus is connected to the vacuuming port through a vacuuming channel; the liquid injection method includes:

[0006] When the battery is evacuated by a vacuuming device and the internal pressure reaches a first preset pressure value, the vacuuming channel is closed, and the liquid injection device is controlled to inject liquid into the battery through the liquid injection port; when the liquid injection device is controlling the liquid injection device to inject liquid into the battery, the liquid injection port of the battery is kept facing downward. When the electrolyte level in the battery reaches the target level, the electrolyte injection device is controlled to stop injecting electrolyte, and the battery is controlled to rotate at a first preset angle so that the air extraction port faces upward.

[0007] In this embodiment, by keeping the battery's injection port facing downwards, the electrolyte is injected into the battery from bottom to top. The electrolyte permeates into the battery cell assembly from bottom to top and from the outside to the inside through the gap between the cell assembly and the casing. As the electrolyte permeates, residual gas in the pores of the cell assembly is replaced. The residual gas displaced by the electrolyte is also pushed upwards and accumulates by the electrolyte. In this way, the flow direction of the residual gas in the pores does not interfere with the flow direction of the electrolyte, thereby helping to reduce the gas "liquid-sealed" in the middle of the cell assembly. This alleviates the problem of poor wetting or interface abnormalities in the cell assembly caused by the gas discharge direction in the pores of the cell assembly being contrary to the electrolyte permeation direction. In addition, based on the density difference between the gas and liquid phases, the aforementioned accumulated gas tends to accumulate in the higher area of ​​the battery during battery rotation. Thus, when the battery is rotated to face upwards, the gas can gather near the vent and be extracted through the vent, thereby helping to improve battery capacity and cycle life.

[0008] In some embodiments, controlling the battery to rotate a first preset angle so that the air extraction port faces upward includes: controlling the battery to rotate gradually multiple times along a first preset direction until the first preset angle is reached; wherein, the first preset direction is a clockwise direction or a counterclockwise direction, and the interval between two adjacent rotations is a first preset time. This achieves a more stable and reliable process effect.

[0009] In some embodiments, the battery rotates at the same speed each time; and / or, the battery rotates at the same angle each time; and / or, the interval between each rotation of the battery is the same. This helps to improve the consistency of the processing effect of multiple batteries within a batch.

[0010] In some embodiments, the battery rotates at an angle greater than or equal to 10° and less than or equal to 30° each time. This helps to improve the uniformity of cell assembly wetting and the thoroughness of venting.

[0011] In some embodiments, the first preset duration is greater than or equal to 1 minute and less than or equal to 10 minutes. This helps to improve the wetting effect of the battery cell assembly and increase production efficiency.

[0012] In some embodiments, the electrolyte injection device further includes a heating device, which, before controlling the electrolyte injection device to inject electrolyte into the battery, further includes controlling the heating device to heat the battery at a first preset temperature and a second preset duration. This helps improve the uniformity of electrolyte wetting and reduce wetting time, thus helping to reduce residual gas inside the battery.

[0013] In some embodiments, the injection port and the venting port are the same process opening on the battery. This helps reduce the number of process openings on the battery casing and lowers the risk of seal failure.

[0014] In some embodiments, the battery has at least two process openings, at least one of which is the liquid injection port, and at least another of which is the venting port. This allows the liquid injection and venting processes to be optimized independently, improving the flexibility and reliability of the liquid injection process.

[0015] In some embodiments, the battery includes a housing and an end cap covering the housing. The housing has an end wall opposite to and spaced apart from the end cap, two first side walls and two second side walls connected to the end wall. The two first side walls are opposite to and spaced apart along a first direction, and the two second side walls are opposite to and spaced apart along a second direction. The first and second directions are perpendicular or substantially perpendicular. The extension length of the first side wall along the second direction is greater than or equal to the extension length of the second side wall along the first direction. The edges of the end wall and the first side walls are first edges, and the edges of the end wall and the second side walls are second edges. The process opening is located on the end cap. Controlling the battery to rotate by a first preset angle to make the vent upward includes controlling the battery to rotate about a first axis as the rotation axis until the vent upward. The first axis is parallel or substantially parallel to the first edge, or the first axis is parallel or substantially parallel to the second edge. Thus, by setting the rotation axis of the battery to be parallel or substantially parallel to its specific edge direction, the rotation path matches the geometry of the battery, which helps the battery to stably and efficiently adjust the vent to the upward position.

[0016] Secondly, this application provides a liquid injection device, which includes a vacuuming device, a liquid injection device, a frame, a rotating device, and a control device. The vacuuming device is connected to the air extraction port of a battery through an air extraction channel to perform vacuuming on the battery. The liquid injection device is connected to the liquid injection port of the battery through a liquid injection channel to inject liquid into the battery. The rotating device is rotatably mounted on the frame, and the battery is fixed to the rotating device. The control device is electrically connected to the vacuuming device, the liquid injection device, and the rotating device. The control device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. The computer program is configured to implement the steps of the liquid injection method described in any of the foregoing embodiments.

[0017] In some embodiments, the rotating device is provided with a heating device, which is electrically connected to the control device; the heating device is used to heat the battery fixed to the rotating device.

[0018] In some embodiments, the rotating device includes a drive mechanism, a mounting bracket, and multiple clamping mechanisms. The mounting bracket is disposed on the frame. The drive mechanism is driven to the mounting bracket, and the mounting bracket can be driven by the drive mechanism to rotate relative to the frame. The multiple clamping mechanisms are respectively disposed on the mounting bracket, and the clamping mechanisms are used to fix at least one battery. This helps to improve production efficiency.

[0019] Thirdly, this application provides a storage medium, which is a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the steps of the injection method described in any of the foregoing embodiments.

[0020] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0021] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is an exploded structural diagram of some embodiments of the battery to be injected with electrolyte according to this application; Figure 2 This is a schematic diagram of the liquid injection device structure according to some embodiments of this application; Figure 3 This is a schematic diagram showing the state of the battery before or during electrolyte filling according to some embodiments of this application; Figure 4 This is a schematic diagram showing the state where the air extraction port faces upward after the battery is rotated to a first preset angle in some embodiments of this application; Figure 5 This is a schematic diagram of the connection structure between the liquid injection device and the battery in some embodiments of this application; Figure 6 This is a schematic diagram of the connection structure between the liquid injection device and the battery in some other embodiments of this application; Figure 7 This is a schematic flowchart of the liquid injection method in one embodiment of this application; Figure 8 This is a schematic flowchart of the liquid injection method in another embodiment of this application.

[0022] The reference numerals in the detailed embodiments are as follows: 100. Battery; 101. Inlet; 102. Vacuum port; 110. Housing; 111. First sidewall; 112. Second sidewall; 113. End wall; 103. First edge; 104. Second edge; x, first direction; y, second direction; 120. End cap; 130. Cell assembly; 200. Inlet device; 210. Inlet device; 211. Inlet channel; 220. Vacuum device; 221. Vacuum channel; 230. Rotating device; 231. Mounting bracket; 232. Clamping mechanism; 240. Heating device.

[0023] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0024] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0026] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0029] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0030] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0031] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0032] Battery production involves multiple technological steps, and electrolyte injection is one of them. After battery assembly, electrolyte injection refers to the process of creating a negative pressure inside the battery by drawing a vacuum, and then injecting electrolyte into the battery through an injection port on the battery casing. However, even after vacuuming, residual gases may still exist inside the battery. These residual gases are mainly found in the space between the casing and the cell assembly, as well as in the pores within the cell assembly. In other words, residual gases include those in the space and those in the pores. While residual gases in the space can generally be expelled through negative pressure, residual gases in the pores require the wetting and replacement of the electrolyte.

[0033] Before electrolyte injection, battery cells are typically pressurized, significantly reducing their porosity and pore size, resulting in a slower electrolyte wetting rate. In existing technologies, the electrolyte is usually injected into the battery from top to bottom. The electrolyte first fills the gap between the cell and the casing, then gradually permeates into the cell assembly from the periphery. During this process, gas in the pores is squeezed out, flowing from the center outwards. However, this direction contradicts the electrolyte's permeation direction, easily causing gas in the pores to be trapped in the central area of ​​the cell, forming a "liquid seal" phenomenon that prevents effective expulsion. This can lead to poor wetting, abnormal interfaces, and consequently increase the risk of low capacity and accelerated degradation during battery use.

[0034] Based on this, in order to alleviate the problem of poor wetting or interface abnormalities caused by the opposite direction of the discharge of residual gas in the pores to the direction of electrolyte penetration, this application keeps the battery's injection port facing downwards, allowing the electrolyte to be injected into the battery from bottom to top. The electrolyte penetrates into the cell assembly from bottom to top and from outside to inside through the gap between the cell assembly and the casing. As the electrolyte penetrates, the residual gas in the pores of the cell assembly is replaced, and the residual gas in the pores that is replaced by the electrolyte is also pushed upwards and accumulates by the electrolyte. In this way, the flow direction of the residual gas in the pores and the flow direction of the electrolyte are basically independent of each other, thereby reducing the gas trapped in the middle of the cell assembly due to "liquid sealing".

[0035] This application provides a liquid injection method for use in a liquid injection device including a liquid injection apparatus and a vacuum pumping device, for injecting electrolyte into the interior of a battery. This liquid injection method aims to alleviate problems such as poor wetting of battery cell components or interface abnormalities caused by the direction of residual gas discharge from pores contradicting the direction of electrolyte penetration.

[0036] Below, let's first combine Figures 1 to 6 The structure of the battery 100 and the liquid injection device 200 involved in this application will be described.

[0037] In this application, the battery 100 can also be understood as a single battery cell. The interior of the battery 100 is the cavity of the single battery cell, and the single battery cell is the smallest unit of the battery 100. The single battery cell can include, but is not limited to, lithium-ion secondary batteries 100, lithium-ion primary batteries 100, lithium-sulfur batteries 100, sodium-lithium-ion batteries 100, sodium-ion batteries 100, or magnesium-ion batteries 100. The shape of the single battery cell can include, but is not limited to, cylinders, flat bodies, cuboids, or other shapes. According to the packaging method, the single battery cell can include, but is not limited to, cylindrical battery cells 100, square battery cells 100, pouch battery cells 100, and blade battery cells 100.

[0038] For example, please refer to Figure 1The battery 100 includes an end cap 120, a housing 110, a cell assembly 130, and other functional components. Generally, the end cap 120 and the housing 110 constitute the outer shell of the battery 100 unit.

[0039] End cap 120 refers to a component that covers the opening of housing 110 to isolate the internal environment of battery cell 100 from the external environment. The shape of end cap 120 can be adapted to the shape of housing 110 to fit it. Optionally, end cap 120 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 120 is not easily deformed under pressure and impact, giving battery cell 100 higher structural strength and improved safety performance. Functional components such as electrode terminals can be provided on end cap 120. Electrode terminals can be used for electrical connection with cell assembly 130 to output or input electrical energy to battery cell 100. In some embodiments, end cap 120 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 100 reaches a threshold. The material of end cap 120 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 120. The insulating element can be used to isolate the electrical connection components within the housing 110 from the end cap 120 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0040] The housing 110 is a component used to cooperate with the end cap 120 to form the internal environment of the battery cell 100. This internal environment can accommodate the cell assembly 130, electrolyte, and other components. The housing 110 and the end cap 120 can be independent components. An opening can be provided on the housing 110, and the end cap 120 can be used to close the opening to form the internal environment of the battery cell 100. Alternatively, the end cap 120 and the housing 110 can be integrated. Specifically, the end cap 120 and the housing 110 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 110, the end cap 120 closes the housing 110. The housing 110 can have various shapes and sizes, such as cuboid, cylindrical, or hexagonal prism. Specifically, the shape of the housing 110 can be determined according to the specific shape and size of the cell assembly 130. The shell 110 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special restrictions on this.

[0041] The cell assembly 130 is the component in the battery cell 100 where the electrochemical reaction occurs. The casing 110 may contain one or more cell assemblies 130. The cell assembly 130 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the cell assembly 130, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery 100, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.

[0042] The battery 100 to be filled with electrolyte has an injection port 101 for injecting electrolyte into the battery 100 and an extraction port 102 for venting gas from the battery 100. The injection port 101 and the extraction port 102 can be the same opening on the outer casing, or they can be separate openings on the outer casing. That is, the outer casing has multiple openings, at least one of which is the injection port 101, and at least another is the extraction port 102. It is understood that the openings here refer to process openings on the outer casing. Generally, in embodiments where the injection port 101 and the extraction port 102 are separate process openings on the outer casing, the injection port 101 and the extraction port 102 are usually located on the same side of the battery, for example, on the end cap 120. Of course, for the purpose of achieving the technical objectives of this application, the specific location of the injection port 101 and the extraction port 102 on the battery is not limited.

[0043] The vacuuming device 220 is used to evacuate air from the battery 100 to reduce the internal pressure of the battery 100. Generally, the vacuuming device 220 includes a vacuuming component, which may be a vacuum pump, a vacuum generator, or the like. Taking a vacuum pump as an example, the pump inlet of the vacuum pump is connected to the battery 100 being evacuated through the evacuation channel 221, so that the inside of the battery 100 can be evacuated through the evacuation port 102. In addition, in order to detect the internal pressure of the battery 100 in real time, a pressure detection device, such as a pressure sensor, is also provided in the evacuation channel 221 or the battery 100.

[0044] The electrolyte injection device 210 is a device for injecting electrolyte into the battery 100. Generally, the electrolyte injection device 210 includes an injection component and a storage container. The storage container is used to store the electrolyte to be injected and is connected to the injection component through a pipeline. The injection component of the electrolyte injection device 210 may optionally be a pump, a syringe, or the like. Taking a pump as an example, the outlet of the pump is connected to the injection port 101 of the battery 100 through an injection tube, thereby enabling the electrolyte to be injected into the battery 100 through the injection port 101. During the injection process, the electrolyte injection device 210 can precisely control the start, stop, and flow rate of the injection according to a preset injection volume or injection time, so that the battery 100 is accurately injected with the required amount of electrolyte.

[0045] In this embodiment, the vacuuming device 220 is sealed and connected to the air extraction port 102 of the battery 100 via the air extraction channel 221. The air extraction channel 221 has an open state and a closed state. Exemplarily, an air extraction valve is provided on the component constituting the air extraction channel 221. This air extraction valve is used to control the opening or closing of the air extraction channel 221, or to control the effective flow area of ​​the air extraction channel 221. The liquid injection device 210 is sealed and connected to the liquid injection port 101 of the battery 100 via the liquid injection channel 211. The liquid injection channel 211 has an open state and a closed state. Exemplarily, an liquid injection valve is provided on the component constituting the liquid injection channel 211. This liquid injection valve is used to control the opening or closing of the liquid injection channel 211, or to control the effective flow area of ​​the liquid injection channel 211. In other words, the liquid injection channel 211 and the air extraction channel 221 are relatively independent channels, and the opening and closing of both the liquid injection channel 211 and the air extraction channel 221 can be controlled independently.

[0046] In some embodiments of this application, the injection process typically includes the following stages: During the connection phase, the battery 100 is fixed to the liquid injection station, and the vacuum pumping device 220 and the liquid injection device 210 are connected to the battery 100. There are many ways to connect the vacuum pumping device 220 and the liquid injection device 210 to the battery 100; in one example, such as... Figures 1 to 5 As shown, the injection port 101 and the evacuation port 102 share a single process opening, typically connected to this opening via a connector that integrates at least a portion of the injection channel 211 and at least a portion of the evacuation channel 221; wherein, as... Figure 5As shown, within this connector, a portion of the injection channel 211 and the suction channel 221 can be shared; alternatively, the injection channel 211 and the suction channel 221 can be two parallel channels. Further, the injection channel 211 within the connector is connected to the injection device 210 via an injection pipe, and the suction channel 221 within the connector is connected to the injection device 210 via a suction pipe. In this example, an injection valve can be provided on the injection pipe, and a suction valve can be provided on the suction pipe. Alternatively, the connector integrating at least a portion of the injection channel 211 and at least a portion of the suction channel 221 can be equipped with valves, one valve controlling the portion of the injection channel 211 and the other valve controlling the portion of the suction channel 221; thus, the opening and closing of the injection channel 211 and the suction channel 221 can be controlled independently. In another example, as... Figure 6 As shown, the injection port 101 and the vacuum port 102 are process openings located separately on the outer casing. Generally, the injection head of the injection device 210 is connected to the process opening corresponding to the injection port 101, and the vacuum connector of the vacuum device 220 is connected to the process opening corresponding to the vacuum port 102. Generally, during the connection stage, the injection channel 211 is in a closed state, while the vacuum channel 221 can be in either an open or closed state.

[0047] During the vacuuming phase, the air extraction channel 221 is open, and the vacuuming device 220 is activated. The vacuuming operation is performed inside the battery 100 through the air extraction channel 221 to extract the internal gas, bringing the internal cavity of the battery 100 to a preset negative pressure state. Generally, during the vacuuming process, the internal pressure value of the battery 100 is continuously acquired through the air extraction channel 221 or the pressure detection device of the battery 100. When the internal pressure value of the battery 100 reaches a first preset pressure value, the vacuuming is stopped and the air extraction channel 221 is closed. This internal pressure value is typically the internal cavity pressure value of the battery 100.

[0048] During the electrolyte injection stage, before the electrolyte injection device 210 injects electrolyte into the battery 100, the electrolyte injection port 101 of the battery 100 is kept facing downwards. Then, the electrolyte injection device 210 is started, allowing the electrolyte to enter the battery 100 from bottom to top. Generally, the electrolyte injection device 210 is started after the vacuuming is stopped and the air extraction channel 221 is closed to prevent electrolyte from entering the vacuuming device 220. Of course, if the possibility of electrolyte entering the vacuuming device 220 is not considered, the order of closing the air extraction channel 221 and starting the electrolyte injection device 210 is not limited.

[0049] In the secondary evacuation stage, when the electrolyte level in the battery 100 reaches the target level, the electrolyte injection device 210 is stopped, and the battery 100 is rotated by a first preset angle so that the evacuation port 102 faces upward. Generally, after the electrolyte injection operation, the battery 100 needs to be left to stand or evacuated. As mentioned above, before the electrolyte injection device 210 injects electrolyte into the battery 100, the electrolyte injection port 101 of the battery 100 is kept facing downward. Since the electrolyte injection port 101 and the evacuation port 102 are usually close to each other, on the same side, or share a process opening, the battery's orientation usually needs to be adjusted before evacuation, i.e., the battery 100 is rotated by a first preset angle so that its evacuation port 102 faces upward. Thus, secondary evacuation is performed through the evacuation port 102. Here, since the battery is fixed on the rotating device 230 in the aforementioned connection stage, the rotating device 230 can be used to drive the battery 100 to rotate.

[0050] This application provides a liquid injection method, such as... Figure 7 As shown, Figure 7 This is a schematic flowchart of an electrolyte injection method provided according to some embodiments of this application. This electrolyte injection method is used to inject electrolyte into a battery 100, and the method includes: S10: When the vacuum device 220 performs a vacuuming operation on the inside of the battery 100 and the internal pressure of the battery 100 reaches the first preset pressure value, the vacuum channel 221 is closed, and the liquid injection device 210 is controlled to inject liquid into the battery 100 through the liquid injection port 101; when the liquid injection device 210 injects liquid into the battery 100, the liquid injection port 101 of the battery 100 is kept facing downward. Generally, before the liquid injection begins, the vacuuming device 220 and the liquid injection device 210 are already connected and in place; that is, both the vacuuming device 220 and the liquid injection device 210 are connected to the battery 100 to be injected via corresponding connectors. Then, the vacuuming device 220 is activated, and a vacuum is created inside the battery 100 through the suction port 102 to remove air and other gases from inside the battery 100. During this process, the pressure detection device continuously monitors the pressure inside the battery 100; when the detected pressure value drops to a preset first preset pressure value, the suction channel 221 is closed.

[0051] The first preset pressure value is a pressure value that is typically lower than atmospheric pressure, and this first preset pressure value is usually a user-set value; at this time, the battery 100 maintains a high degree of vacuum. Immediately afterwards or after a slight delay, the electrolyte injection device 210 is activated, so that the electrolyte is rapidly drawn into the battery 100 through the injection port 101 under the action of the pressure difference. Since the evacuation channel 221 has been closed and the battery 100 is under negative pressure, the amount of electrolyte being extracted by the evacuation device at the same time as being injected can be reduced.

[0052] When the electrolyte injection device 210 injects electrolyte into the battery 100, the electrolyte injection port 101 of the battery 100 is kept facing downwards. This can be achieved either by directly positioning the battery 100 with the electrolyte injection port 101 facing downwards during the feeding stage of the electrolyte injection process, or by rotating the battery 100 to this position using the rotating device 230 after feeding. Maintaining the downward orientation of the electrolyte injection port 101 ensures that the electrolyte can be injected into the battery 100 from bottom to top. The electrolyte injection device 210 injects electrolyte into the battery 100 through the electrolyte injection port 101. As in the previous example, this can be achieved by opening the electrolyte injection valve and starting the electrolyte injection pump, allowing the electrolyte to enter the battery 100 from bottom to top through the electrolyte injection channel 211 and the electrolyte injection port 101.

[0053] S20: When the liquid injection volume of the battery 100 reaches the target volume, control the liquid injection device 210 to stop the liquid injection and control the battery 100 to rotate at a first preset angle so that the air extraction port 102 faces upward.

[0054] During the electrolyte injection process, the injection volume can be measured in various ways. For example, a flow meter (such as a mass flow meter or volumetric flow meter) can be installed on the supply line of the injection device 210 to measure the amount of electrolyte injected into the battery 100 in real time. When the flow meter detects that the cumulative injection volume has reached the preset target volume, it controls the injection device 210 to stop working and simultaneously closes the injection valve, completing the electrolyte injection operation of the battery 100. The target volume is usually preset according to the design capacity of the battery 100.

[0055] As mentioned above, the injection port 101 and the venting port 102 can be the same process opening, or they can be different process openings located on the outer casing of the battery 100. In embodiments where the injection port 101 and the venting port 102 are different process openings located on the outer casing of the battery 100, the injection port 101 and the venting port 102 are usually located on the same side of the battery 100. For example, the injection port 101 and the venting port 102 are located on the end cap 120 of the battery 100. Of course, they can also be located in other positions on the battery, such as on the battery casing. In this application, when the injection device 210 injects liquid into the battery 100, the injection port 101 of the battery 100 is kept facing downwards. Therefore, after the injection is completed, the battery 100 needs to be rotated by a first preset angle so that the venting port 102 faces upwards. Thus, secondary venting is performed through the venting port 102.

[0056] The battery 100 is controlled to rotate by a first preset angle so that the vent 102 faces upward. Generally, this is also used in conjunction with a rotating device 230, which is usually mounted on a frame. The rotating device 230 can drive the battery 100 to rotate so that the battery 100 can rotate to a position where the vent 102 faces upward. The battery 100 can rotate continuously or intermittently. The first preset angle is usually determined based on the structure of the battery 100 and the position of the vent 102 relative to the battery 100. The selection of the first preset angle is generally based on the premise that the electrolyte in the battery 100 does not affect the secondary venting. For example, taking the vent 102 and the liquid injection port 101 sharing a single process opening, the battery 100 is usually flipped over, that is, the first preset angle is about 180°, such as 175°, 176°, 178°, 180°, 181°, 183° or 185°, or other angles, which will not be listed here.

[0057] Understandably, there is a minute gap between the casing 110 and the cell assembly 130, and the area corresponding to this gap has low flow resistance. When the battery 100 rotates, the aforementioned accumulated gas tends to move along this gap; simultaneously, due to the density difference between the gas and liquid phases, the aforementioned accumulated gas tends to remain in the higher region of the battery during rotation. Thus, when the battery rotates to a first preset angle until the vent 102 faces upward, the gas can converge near the vent 102 and be extracted through it.

[0058] In this embodiment, the electrolyte is injected into the battery from bottom to top by pointing the electrolyte inlet 101 downwards. The electrolyte permeates from the gap between the cell assembly 130 and the casing 110 from bottom to top and from outside to inside into the cell assembly 130. As the electrolyte permeates, residual gas in the pores of the cell assembly is replaced. The residual gas in the pores that is replaced by the electrolyte is also pushed upwards and accumulates by the electrolyte. In this way, the flow direction of the residual gas in the pores does not interfere with the flow direction of the electrolyte, thereby reducing the amount of gas trapped in the cell assembly due to "liquid sealing". The gas in the middle of component 130 is removed, thereby alleviating the problem of poor wetting or interface abnormalities in the battery cell assembly caused by the gas discharge direction in the pores of the battery cell assembly being contrary to the electrolyte permeation direction. In addition, based on the density difference between the gas and liquid phases, the aforementioned accumulated gas tends to remain in the high position region of the battery during battery rotation. Thus, when the battery rotates to the position where the vent is facing upward, the aforementioned accumulated gas can converge near the vent 102 and be extracted through the vent 102, thereby helping to improve the capacity and cycle life of battery 100.

[0059] In some embodiments, please refer to Figure 8 Controlling the battery 100 to rotate at a first preset angle so that the air intake 102 faces upward includes: S21: Control the battery 100 to rotate gradually multiple times along a first preset direction until it reaches a first preset angle; wherein, the first preset direction is either clockwise or counterclockwise, and the interval between two adjacent rotations is a first preset time.

[0060] As mentioned above, after performing the liquid injection operation, the battery 100 needs to be left to stand or evacuated. Before evacuating, the battery's orientation needs to be adjusted, that is, the battery 100 is rotated at a first preset angle so that its evacuation port 102 faces upward.

[0061] To clearly define the direction during rotation, the battery's rotation direction is defined by a first preset direction. Generally, when controlling rotation, it is first necessary to determine the rotation axis of the battery 100. Using this rotation axis as a reference, a plane perpendicular to the rotation axis is defined as a reference plane (i.e., the observation plane). Thus, the operator or control system observes from this reference plane to determine the rotation direction. In this embodiment, the "first preset direction" refers to the clockwise rotation of the battery 100 when observing from the reference plane (or, depending on the actual mechanical design, counterclockwise). That is, controlling the battery 100 to rotate directly to the target angle along a certain preset direction.

[0062] It is understandable that the determination of the aforementioned "first preset direction" is related to the choice of observation angle. Under another observation angle (e.g., from the back of the reference plane), the original clockwise direction will appear as a counterclockwise direction. Therefore, as long as the air extraction port 102 can be rotated from the initial position to the upward position, regardless of whether it is defined as clockwise or counterclockwise according to the observation angle, it should be regarded as adopting the same technical concept as this embodiment and falling within the protection scope of this application.

[0063] Furthermore, to improve the smoothness of the rotation process and reduce electrolyte sloshing, the rotation process is not completed in one step, but rather in a stepwise manner. That is, the battery 100 is controlled to rotate gradually multiple times along a first preset direction until a first preset angle is reached; wherein, the interval between two adjacent rotations is a first preset time. During the rotation process, the interval between two adjacent rotations is the first preset time. In other words, after each rotation, the battery 100 enters a short resting period, waiting for the first preset time to pass before the next rotation. This interval is set to allow sufficient stabilization time for the electrolyte and gas inside the battery 100 after each angle adjustment. The number of rotations of the battery 100 can be two, three, four, five, six, or more, without specific limitations; generally, within a certain range, the more times the battery 100 rotates, the more beneficial it is for the discharge of residual gas from the pores; the first preset time is usually set according to the wetting effect of different types or specifications of the battery 100. For example, the first preset duration can be 1 minute, 2 minutes, 3 minutes, 4 minutes, 5 minutes, 6 minutes, 8 minutes, 10 minutes, 12 minutes or more; generally, within a certain range, the longer the interval between two adjacent rotations, the more beneficial it is to the wetting effect on the battery cell assembly 130.

[0064] The speed at which the battery 100 rotates each time can be the same or different. In embodiments where the speed of the battery 100 rotates each time is different, the speed of the battery 100 rotating each time can show an increasing trend, a decreasing trend, or an alternating change, etc. The angle at which the battery 100 rotates each time can be the same or different. In embodiments where the angle at which the battery 100 rotates each time is different, the angle at which the battery 100 rotates each time can show an increasing trend, a decreasing trend, or an alternating change, etc. The interval between two adjacent rotations is a first preset time. In embodiments where the battery 100 rotates three or more times, there are two or more first preset time intervals. These multiple first preset time intervals can be the same or different. In embodiments where the multiple first preset time intervals are different, the multiple first preset time intervals can show an increasing trend, a decreasing trend, or an alternating change, etc.

[0065] It is understandable that the first preset time interval between two adjacent rotations is named for ease of distinction, since there is a second preset time interval later, and does not mean that the interval between two adjacent rotations is the same.

[0066] In this embodiment, a more stable and reliable process effect can be obtained by adopting a control method of gradual rotation and intermittent rest. Compared with a one-time rapid rotation to the final position, step-by-step rotation can reduce violent shaking or splashing of the electrolyte caused by drastic changes in posture, and help reduce the dispersal of tiny bubbles and their re-mixing into the electrolyte. The rest interval between each rotation provides sufficient time for the release, aggregation, and rise of bubbles. During the rest period, tiny bubbles have enough time to aggregate into larger bubbles in the liquid; during the next rotation, the flow of large bubbles in the liquid is easier, and finally, when the vent 102 is facing upward, more residual gas is collected at the vent 102, which is conducive to the discharge of residual gas and improves the wetting effect of the cell assembly 130.

[0067] In some embodiments, the battery 100 rotates at the same speed each time; and / or, the battery 100 rotates at the same angle each time; and / or, the interval between each rotation of the battery 100 is the same.

[0068] Among them, the battery 100 rotates at the same speed, rotates at the same angle, and has the same interval between two adjacent rotations; that is, in the process of controlling the battery 100 to rotate gradually multiple times along the first preset direction until the first preset angle is reached, the kinematic parameters of each rotation can be set in a standardized manner.

[0069] In one example, the battery 100 rotates at the same speed each time, which can be set to keep the speed of the battery 100 the same in each rotation. For example, no matter how many times it rotates, the rotation speed is kept constant at 2 revolutions per minute. In this way, after each angle adjustment of the battery 100, the centrifugal force and shear force on the electrolyte are approximately the same, which helps to reduce the difference in liquid disturbance caused by speed fluctuations.

[0070] In another example, the angle of rotation of battery 100 can be set to remain the same for each rotation. For example, if the step angle of each rotation is set to 15 degrees, battery 100 needs to undergo multiple rotations of the same angle to accumulate to reach the final first preset angle (such as 180 degrees). By keeping the rotation angle the same for each rotation, the displacement of the electrolyte in each attitude adjustment is uniform, which helps to achieve a gradual and smooth transition in liquid distribution.

[0071] In another example, the interval between each rotation of battery 100 can be set to be the same. For example, regardless of the number of rotations, the resting time between each two rotations is fixed at 2 minutes. In this way, the electrolyte and air bubbles inside battery 100 have approximately equal stabilization and release times after each attitude fine-tuning, making the cycle highly uniform.

[0072] The above methods can be used individually or in any combination. When these features are used simultaneously, that is, throughout the entire gradual rotation process, the battery 100 operates at approximately the same rhythm: each time it rotates at the same speed and the same angle, then rests for approximately the same duration, before the next rotation. This highly standardized control mode transforms the entire attitude adjustment process into a highly repeatable and highly predictable standardized procedure.

[0073] In this embodiment, the control parameters for each rotation and rest are at least partially unified, which helps to reduce random variables in the process and makes the physical field changes experienced by the battery 100 in each round of attitude adjustment roughly the same. This is beneficial for the smooth transfer of electrolyte and the orderly release of gas, and also helps to improve the consistency of the processing effect of multiple batteries 100 in a batch.

[0074] In some embodiments, the angle of rotation of the battery 100 is greater than or equal to 10° and less than or equal to 30° each time.

[0075] In the process of controlling the battery 100 to rotate gradually multiple times along a first preset direction until reaching a first preset angle, the angle of each rotation is set to be greater than or equal to 10° and less than or equal to 30°. For example, the angle of each rotation of the battery 100 can be 10°, 12°, 15°, 18°, 20°, 22°, 25°, 27°, or 30°. In other words, the battery 100 does not move slowly with too small a step size, nor does it adjust drastically with too large a step size, but rotates within the aforementioned angle range. For example, the rotation angle can be set to 15° each time, so that the battery 100 changes its posture gradually with a more precise step size; or it can be set to 25°, so that the posture transition is completed at a relatively faster pace. The lower limit of 10° in this range ensures that each rotation can effectively affect the distribution of the electrolyte, reducing the low adjustment efficiency caused by too small a rotation angle; the upper limit of 30° helps to reduce the violent shaking or splashing of the electrolyte caused by too large a single rotation angle, improving the stability of the electrolyte during transfer within the cell assembly 130.

[0076] This embodiment controls the rotation angle of the battery 100 to between 10° and 30° each time, which helps to achieve a balance between attitude adjustment efficiency and process stability. This allows the battery 100 to complete the overall attitude adjustment with a limited number of steps, while each angle change will not cause excessive impact on the electrolyte. The electrolyte can be smoothly redistributed after each small rotation, which is beneficial to improving the uniformity of wetting of the cell assembly 130 and the thoroughness of venting.

[0077] In some embodiments, the first preset duration is greater than or equal to 1 minute and less than or equal to 10 minutes.

[0078] During the gradual rotation of the battery 100, the first preset time interval between two adjacent rotations is set to be greater than or equal to 1 minute and less than or equal to 10 minutes. In other words, after each rotation, the battery 100 enters a resting period, the duration of which falls within the aforementioned time window. In any case, the first preset time interval can be 1 minute, 2 minutes, 3 minutes, 4 minutes, 5 minutes, 6 minutes, 7 minutes, 8 minutes, 9 minutes, or 10 minutes.

[0079] The first preset duration is typically set based on the type and specifications of the battery 100. For example, the interval between two adjacent rotations can be set to 3 minutes, allowing the battery 100 sufficient time to settle and permeate after each angle adjustment; or it can be set to 8 minutes based on the electrolyte viscosity and cell structure characteristics to accommodate thicker electrode sheets or larger cell assembly 130 specifications. The lower limit of this range, 1 minute, ensures a sufficiently long settling period for the battery 100 to fully absorb the electrolyte into the micropores of the electrode sheets using capillary action, and to allow sufficient time for tiny bubbles to coalesce and float. The upper limit of 10 minutes mitigates production cycle delays caused by excessive settling, because beyond this time, the permeation increment per unit time is extremely limited, and the marginal benefit of continued settling for improving the wetting effect is very low.

[0080] In this embodiment, by controlling the interval between adjacent rotations to between 1 minute and 10 minutes, a certain physical time is provided for the capillary penetration of the electrolyte and the aggregation and release of bubbles, while also alleviating the waste of production line cycle time caused by excessively long resting time; thus, it helps to improve the wetting effect of the battery cell assembly 130 and improve production efficiency.

[0081] In some embodiments, please refer to Figures 1 to 3 The liquid injection device 200 also includes a heating device 240, and before controlling the liquid injection device 210 to inject liquid into the battery 100, it also includes: The heating device 240 is controlled to heat the battery 100 at a first preset temperature and a second preset duration.

[0082] Generally, before the electrolyte injection device 210 injects electrolyte into the battery 100, the heating device 240 heats the battery 100 at a first preset temperature and a second preset duration. This heating can occur before vacuuming, during vacuuming, or after vacuuming. In other words, the battery 100 is preheated before electrolyte injection. This causes the micropores of the electrodes and separator of the battery 100 to expand slightly upon heating, which facilitates subsequent gas release and electrolyte permeation.

[0083] The first preset temperature can be set according to the material of the battery 100 casing 110 and the cell's tolerance characteristics. For example, setting it to a temperature value between 40°C and 60°C can both activate the internal materials of the cell and reduce the damage to the battery 100 caused by high temperature. The second preset duration is set according to the heat capacity and size of the cell assembly 130 to ensure that the entire battery 100 can be heated to the set temperature evenly. For example, heating for 30 minutes to 120 minutes allows the heat to be fully transferred to the depths of the cell assembly 130.

[0084] Furthermore, before vacuuming the inner cavity of the battery 100 using the vacuuming device 220, the heating device 240 is controlled to heat the battery 100 at a first preset temperature and a second preset duration. That is, after preparation, the heating device 240 is first controlled to heat the battery 100; the heating process is executed according to preset process parameters, namely heating at the first preset temperature for the second preset duration. After preheating, a vacuuming operation is performed immediately or while maintaining the temperature. At this time, residual gas can be extracted more efficiently, which is beneficial to obtaining a higher vacuum degree before electrolyte injection, reducing gas residue, and facilitating electrolyte penetration.

[0085] In this embodiment, the battery 100 is preheated before the electrolyte is injected into the battery 100 by the control injection device 210. The preheating treatment reduces the adsorption of gas molecules by the internal materials of the cell assembly 130. The preheated cell assembly 130 is in a hot state. When the electrolyte is injected subsequently, the contact between the warm electrode and the electrolyte helps to reduce the viscosity of the liquid and accelerate the capillary penetration process, thereby helping to improve the uniformity of electrolyte wetting and reduce the wetting time. Secondly, before the vacuuming operation is performed on the inside of the battery 100 by the vacuuming device 220, the heating device 240 is controlled to heat the battery 100 at a first preset temperature and a second preset time, which helps to reduce the gas residue inside the battery 100.

[0086] In some embodiments, please refer to Figures 1 to 5 The liquid injection port 101 and the air extraction port 102 are the same process openings provided on the battery 100.

[0087] The electrolyte injection port 101 and the venting port 102 are integrated into a single process opening on the battery 100. This process opening serves both to inject electrolyte into the battery 100 and to extract internal gases during resting or subsequent formation processes. During the electrolyte injection process, electrolyte is injected into the cell through this opening. During the intermittent rotation and resting process after electrolyte injection, the opening changes direction according to the battery 100's orientation. When it is necessary to remove residual gas from the cell, the battery 100 is rotated to an orientation where the process opening faces upwards, allowing the collected gas to be concentrated there for extraction during subsequent venting operations.

[0088] In this embodiment, the liquid injection port 101 and the air extraction port 102 are the same process openings provided on the battery 100, which helps to reduce the number of process openings in the battery 100 casing 110, thereby helping to reduce the risk of sealing failure during battery device use.

[0089] In some embodiments, the battery 100 is provided with at least two process openings, wherein at least one process opening is a liquid injection port 101 and at least another process opening is a venting port 102.

[0090] The battery 100's casing 110 has at least two independent process openings. At least one opening is specifically designated as an injection port 101 for injecting electrolyte into the cell; the other opening is specifically designated as a venting port 102 for venting gas from inside the battery 100 during settling or formation processes. Thus, the injection port 101 and venting port 102 are spatially independent and can be optimized separately according to functional requirements. For example, the injection port 101 can be designed with a suitable aperture and structure for rapid electrolyte injection, while the venting port 102 can be designed for easy connection to a venting device or integration with an explosion-proof valve. During the injection process, electrolyte is injected through the injection port 101. During subsequent intermittent rotation and settling, the battery 100 is gradually rotated, causing the gas inside the cell to gradually converge towards the venting port 102 under the influence of gravity and liquid displacement, allowing for efficient extraction of any remaining gas.

[0091] In this embodiment, the injection port 101 and the venting port 102 are set separately, which reduces the process burden of a single opening; the two processes of injection and venting can be optimized independently, which helps to improve the flexibility and reliability of the injection process.

[0092] In some embodiments, the battery 100 includes a housing 110 and an end cap 120 covering the housing 110. The housing 110 has an end wall 113 opposite to and spaced apart from the end cap 120, two first side walls 111 connected to the end wall 113, and two second side walls 112. The two first side walls 111 are opposite to and spaced apart along a first direction x, and the two second side walls 112 are opposite to and spaced apart along a second direction y. The first direction x and the second direction y are perpendicular or substantially perpendicular. The extension length of the first side wall 111 along the second direction y is greater than or equal to the extension length of the second side wall 112 along the first direction x. The edges of the end wall 113 and the first side wall 111 are first edges 103, and the edges of the end wall 113 and the second side wall 112 are second edges 104. A process opening is provided in the end cap 120. Controlling the battery 100 to rotate by a first preset angle so that the vent 102 faces upward includes: The control battery 100 rotates around the first axis until the air extraction port 102 faces upward; wherein the first axis is parallel or substantially parallel to the first edge 103, or the first axis is parallel or substantially parallel to the second edge 104.

[0093] The structure of battery 100 is as follows: Figure 6 As shown, the battery 100 includes a housing 110 and an end cap 120 covering the housing 110. The housing 110 has an end wall 113 opposite to and spaced apart from the end cap 120, and two first side walls 111 and two second side walls 112 connected to the end wall 113. The two first side walls 111 are opposite to and spaced apart along a first direction x, and the two second side walls 112 are opposite to and spaced apart along a second direction y. The first direction x and the second direction y can be set to be perpendicular or substantially perpendicular to form the basic outer contour of the battery 100.

[0094] The first sidewall 111 extends along the second direction y, and its length is greater than or equal to the second sidewall 112 extends along the first direction x. That is, the first sidewall 111 is the side with a larger or longer area on the battery 100, and the second sidewall 112 is the side with a smaller or shorter area. The edge formed by the intersection of the end wall 113 and the first sidewall 111 is defined as the first edge 103, and the edge formed by the intersection of the end wall 113 and the second sidewall 112 is defined as the second edge 104. Process openings constituting the liquid injection port 101 and the venting port 102 are provided on the end cap 120.

[0095] During the liquid injection process, after the liquid injection is completed, the battery 100 needs to be rotated by a first preset angle so that the vent 102 faces upward. In this embodiment, during this rotation process: the battery 100 is controlled to rotate around a first axis as the rotation axis until the vent 102 faces upward. The direction of the first axis can be selected in various ways; in one example, the first axis is set to be parallel or substantially parallel to the first edge 103. That is, the rotation axis of the battery 100 is set along the length direction of the battery 100 (i.e., the extension direction of the first edge 103); when the battery 100 rotates around this axis, the two first sidewalls 111 of the battery 100 swing upward or downward alternately, and the vent 102 can also face directly upward with the rotation.

[0096] In another example, the first axis is set to be parallel or substantially parallel to the second edge 104. That is, the axis of rotation of the battery 100 is set along the width direction of the battery 100 (i.e., the direction of extension of the second edge 104). When the battery 100 rotates about this axis, the two second sidewalls 112 of the battery 100 swing up or down alternately, and the vent 102 can also be oriented directly upward with the rotation.

[0097] It is understandable that, due to manufacturing errors and installation tolerances allowed in engineering practice, such as the need for machining accuracy or assembly adjustment, the rotation axis may have a slight angular deviation from the ideal edge direction. For example, this deviation could be 1°, 3°, or 5°, etc., which will not be listed here. However, as long as such deviation does not affect the function of the exhaust port 102 ultimately facing upwards, it should be considered to fall within the protection scope of this application. Thus, the first axis should be parallel or substantially parallel to the first edge 103, or the first axis should be parallel or substantially parallel to the second edge 104.

[0098] In this embodiment, by setting the rotation axis of the battery 100 to be parallel or substantially parallel to its specific edge direction, the rotation path is matched with the geometry of the battery 100, which helps the battery 100 to stably and efficiently adjust the air extraction port 102 to the upward position.

[0099] It should be understood that although the steps in the flowcharts of the above embodiments are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0100] In some embodiments of this application, corresponding to the injection method provided in the embodiments above, Figure 2 This is a schematic diagram of the structure of a liquid injection device 200 for a battery 100 provided in an embodiment of this application. For ease of explanation, only the parts related to the embodiment of this application are shown.

[0101] Reference Figures 2 to 6A liquid injection device 200 is provided, comprising a vacuuming device 220, a liquid injection device 210, a frame, a rotating device 230, and a control device. The vacuuming device 220 is connected to the air extraction port 102 of the battery 100 through an air extraction channel 221 to perform vacuuming on the battery 100. The liquid injection device 210 is connected to the liquid injection port 101 of the battery 100 through a liquid injection channel 211 to inject liquid into the battery 100. The rotating device 230 is rotatably mounted on the frame, and the battery 100 is fixed to the rotating device 230. The control device is electrically connected to the vacuuming device 220, the liquid injection device 210, and the rotating device 230. The control device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. The computer program is configured to perform the steps of the liquid injection method of any of the foregoing embodiments.

[0102] The frame serves as the mounting base for the entire equipment, supporting and securing all other components. The rotating device 230 is rotatably mounted on the frame. The liquid injection device 210 and the vacuuming device 220 are as described in the previous embodiment and will not be elaborated upon here. The vacuuming device 220 and the liquid injection device 210 can be mounted on the frame or on other structural components.

[0103] The rotating device 230 is rotatably mounted on the frame and is used to carry and move the battery 100 between different positions. The rotating device 230 can be a structural component rotatably mounted on the mechanism; for example, the rotating device 230 includes a clamp on which the battery 100 is fixed. In an embodiment where the injection port 101 and the vent port 102 share a single process opening, the rotating device 230 can be a turntable or a tilting frame driven by a motor. The rotating device 230 can rotate or tilt about an axis. Since the battery 100 is mounted on the rotating device 230, the orientation of the battery 100 in space can be changed as the rotating device 230 rotates. This allows the injection port 101 of the battery 100 to face downwards before the injection device 210 injects liquid into the battery 100; and when the liquid injection amount reaches the target amount, the injection device 210 stops injecting liquid, and the battery 100 rotates by a first preset angle so that the vent port 102 faces upwards.

[0104] The control device is electrically connected to the vacuuming device 220, the electrolyte injection device 210, and the rotating device 230, respectively, and is used to coordinate and control the automatic operation of the entire electrolyte injection process. The control device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. The computer program is configured to implement the steps of the electrolyte injection method of any of the foregoing embodiments. Generally, the processor can execute the computer program to control the rotating device 230 to rotate the battery 100 to a predetermined position, control the vacuuming device 220 to perform vacuuming on the battery 100, control the electrolyte injection device 210 to inject electrolyte into the battery 100, and can control the rotating device 230 to rotate the battery 100 again during or after the electrolyte injection process.

[0105] The liquid injection device 200 provided in this application employs the liquid injection method described in the above embodiments to alleviate the problem of poor wetting or interface abnormalities in the battery cell assembly 130 caused by the gas discharge direction in the pores of the core assembly being contrary to the electrolyte permeation direction. Compared with the prior art, the beneficial effects of the liquid injection device 200 provided in this application are the same as those of the liquid injection method provided in the above embodiments, and other technical features of the liquid injection device 200 are the same as those disclosed in the methods of the above embodiments, and will not be repeated here.

[0106] In some embodiments, please refer to Figures 2 to 4 The rotating device 230 includes a driving mechanism, a mounting bracket 231 and a plurality of clamping mechanisms 232. The mounting bracket 231 is disposed on the frame. The driving mechanism is driven to the mounting bracket 231, and the mounting bracket 231 can be driven by the driving mechanism to rotate relative to the frame. The plurality of clamping mechanisms 232 are respectively disposed on the mounting bracket 231, and each clamping mechanism 232 is used to fix at least one battery 100.

[0107] The clamping mechanism 232 can be one or more, and the relationship between the clamping mechanism 232 and the battery 100 can be one-to-one or one-to-many. The rotating device 230 is rotatably mounted on the frame. In one example, such as... Figure 2As shown, the rotating device 230 specifically includes a drive mechanism, a mounting bracket, and multiple clamping mechanisms 232. The mounting bracket, as the rotating body of the rotating device 230, is rotatably mounted on the frame via bearings or a shaft structure. The drive mechanism is mounted on the frame or mounting bracket and driven by the mounting bracket, providing rotational power to drive the mounting bracket to rotate relative to the frame. This drive mechanism can be a combination of a servo motor and a reducer to achieve precise angle control and stable rotational speed. Multiple clamping mechanisms 232 are respectively disposed on the mounting bracket and rotate synchronously with the rotation of the mounting bracket. Each clamping mechanism 232 is used to fix at least one battery 100, firmly holding the battery 100 in a predetermined position. The clamping mechanisms 232 can be in the form of pneumatic grippers, hydraulic grippers, or electric grippers, achieving fixation by clamping the housing 110 or tabs of the battery 100. By driving the mounting bracket to rotate through the drive mechanism, all the clamping mechanisms 232 on the mounting bracket and the fixed batteries 100 rotate together, allowing for flexible changes in the orientation of the battery 100 in space. For example, the rotating device 230 can be a turntable or a flipping frame that can rotate or flip about a horizontal or vertical axis.

[0108] This embodiment achieves synchronous fixing and posture adjustment of multiple batteries 100 by setting a rotating device 230 with a mounting bracket and multiple clamping mechanisms 232. This not only improves production efficiency, but also helps to improve the liquid injection quality and product consistency of multiple batteries 100 by driving the mounting bracket and the multiple batteries 100 on it to rotate as a whole through the drive mechanism.

[0109] In some embodiments, the rotating device 230 is provided with a heating device 240, which is electrically connected to the control device and is used to heat the battery 100 fixed to the rotating device 230.

[0110] The heating device 240 can be installed in the clamping mechanism 232 or in the mounting bracket. It only needs to be able to heat the battery 100 that is fixed to the rotating device 230. Generally, the heating device 240 is installed on the clamping mechanism 232.

[0111] This application provides a computer-readable storage medium having computer-readable program instructions stored thereon, which are used to execute the control method of the liquid injection device 200 in the above embodiments. The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of the computer-readable storage medium may include, but are not limited to: electrical connections with one or more wires, portable computer disks, hard disks, random access memory, read-only memory, erasable programmable read-only memory, optical fibers, portable compact disk read-only memory, optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF, etc., or any suitable combination thereof. The computer-readable storage medium may be a device included in the liquid injection device 200; or it may exist independently and not assembled into the liquid injection device 200.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for injecting electrolyte into a battery, applied to an injection device including an injection apparatus and a vacuuming apparatus, characterized in that, The battery has an injection port and a vacuum port on one side. The injection device is connected to the injection port through an injection channel, and the vacuuming device is connected to the vacuum port through a vacuum channel. The injection method includes: When the battery is evacuated by a vacuuming device and the internal pressure reaches a first preset pressure value, the vacuuming channel is closed, and the liquid injection device is controlled to inject liquid into the battery through the liquid injection port; when the liquid injection device is controlling the liquid injection device to inject liquid into the battery, the liquid injection port of the battery is kept facing downward. When the electrolyte level in the battery reaches the target level, the electrolyte injection device is controlled to stop injecting electrolyte, and the battery is controlled to rotate gradually multiple times along the first preset direction until the first preset angle is reached so that the air extraction port faces upward; the interval between two adjacent rotations is a first preset time; the first preset time is greater than or equal to 1 minute and less than or equal to 10 minutes; the angle of each rotation of the battery is greater than or equal to 10° and less than or equal to 30°. When the battery is rotated so that the air extraction port faces upward, the vacuum pumping device is controlled to perform a secondary air extraction through the air extraction port.

2. The injection method as described in claim 1, characterized in that, The battery rotates at the same speed each time. And / or, the battery rotates at the same angle each time; And / or, the interval between each battery rotation is the same.

3. The injection method as described in claim 1 or 2, characterized in that, The liquid injection device further includes a heating device, and before controlling the liquid injection device to inject liquid into the battery, it also includes: The heating device is controlled to heat the battery at a first preset temperature and a second preset duration.

4. The injection method as described in claim 1 or 2, characterized in that, The liquid injection port and the air extraction port are the same process opening provided on the battery; Alternatively, the battery may have at least two process openings, wherein at least one of the process openings is the liquid injection port, and at least the other process opening is the air extraction port.

5. The injection method as described in claim 4, characterized in that, The battery includes a housing and an end cap covering the housing. The housing has an end wall opposite to and spaced apart from the end cap, two first side walls and two second side walls connected to the end wall. The two first side walls are opposite to and spaced apart along a first direction, and the two second side walls are opposite to and spaced apart along a second direction. The first direction and the second direction are perpendicular or substantially perpendicular. The extension length of the first side wall along the second direction is greater than or equal to the extension length of the second side wall along the first direction. The edges of the end wall and the first side walls are first edges, and the edges of the end wall and the second side walls are second edges. The process opening is located on the end cap; The step of controlling the battery to rotate a first preset angle so that the air intake port faces upward includes: The battery is controlled to rotate around a first axis until the air intake faces upward; wherein the first axis is parallel or substantially parallel to the first edge, or the first axis is parallel or substantially parallel to the second edge.

6. A liquid injection device, characterized in that, The injection device includes: A vacuuming device, which can be connected to the battery's air extraction port through an air extraction channel to perform vacuuming treatment on the battery. The liquid injection device is connected to the liquid injection port of the battery through a liquid injection channel to inject liquid into the battery. frame; A rotating device, rotatably mounted on the frame, wherein the battery is fixed to the rotating device; and A control device is electrically connected to the vacuuming device, the liquid injection device, and the rotating device, respectively; the control device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the liquid injection method as described in any one of claims 1 to 5.

7. The liquid injection device as described in claim 6, characterized in that, The rotating device includes: Drive mechanism; A mounting bracket is disposed on the frame; a drive mechanism is driven to the mounting bracket, and the mounting bracket can be driven by the drive mechanism to rotate relative to the frame; and Multiple clamping mechanisms are provided on the mounting bracket, and the clamping mechanisms are used to fix at least one battery.

8. The liquid injection device as described in claim 7, characterized in that, The rotating device is equipped with a heating device, which is electrically connected to the control device. The heating device is used to heat the battery that is fixed to the rotating device.

9. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, it implements the steps of the injection method as described in any one of claims 1 to 5.

Images