Electrolyte injection device

Abstract

An electrolyte injection device (100), comprising: a sealing mechanism (10) which is provided with a sealing cavity (11) for accommodating a battery (200); an electrolyte injection mechanism (20) which is configured to temporarily store an electrolyte and be in communication with an electrolyte injection port of the battery (200) so as to inject the electrolyte into the battery (200) through the electrolyte injection port, wherein the electrolyte injection mechanism (20) is in communication with the sealing cavity (11), the sealing mechanism (10) is provided with a gas port in communication with the sealing cavity (11), and the gas port is configured to be in communication with a vacuum generation mechanism so as to extract gas from the sealing cavity (11), the electrolyte injection mechanism (20) and the battery (200), or to be in communication with a positive pressure generation mechanism so as to fill the sealing cavity (11), the electrolyte injection mechanism (20) and the battery (200) with high-pressure gas; and a vibration mechanism (30) which can be at least partially arranged in the electrolyte injection mechanism (20) and is configured to send ultrasonic waves to the electrolyte in the electrolyte injection mechanism (20), wherein the electrolyte vibrates under the action of the ultrasonic waves, and the electrolyte can propagate the ultrasonic waves into the battery (200). When the electrolyte is injected into the battery through the electrolyte injection mechanism, the ultrasonic waves can be directionally propagated into the battery and create a cavitation effect in the electrolyte, fine bubbles are continuously released from a gap and a cavity inside the battery, and ultrasonic vibration can enable relaxation of a battery cell in a battery case. In this way, more gas in the battery can be pumped away during subsequent vacuumizing, an electrolyte level in the battery can drop faster when high pressure is applied, and the battery can more easily achieve an infiltration effect, thereby shortening the electrolyte injection time to improve the production efficiency.

Description

Liquid injection device

[0001] This disclosure claims priority to a Chinese patent application filed with the Patent Office of China on March 29, 2024, with application number 202420651355.6 and application name “Liquid Injection Device,” the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to the technical field of battery manufacturing equipment, and in particular to a liquid injection device. Background Art

[0003] Lithium-ion batteries consist of a positive electrode, a negative electrode, a separator, and an electrolyte. The electrolyte, which mediates the movement of lithium ions between the positive and negative electrodes, is essential for the proper functioning of lithium-ion batteries. As a precursor to the impregnation and formation process, sufficient electrolyte must be injected into the battery; otherwise, battery performance will deteriorate or even fail.

[0004] Generally, the injection process of lithium-ion batteries includes the injection process and the impregnation process. During the injection process, the electrolyte is injected into the battery, and during the impregnation process, the electrolyte injected into the battery is absorbed into the battery cell. However, due to various factors (such as electrolyte characteristics, battery cell winding / stacking process, battery shape and size, battery temperature, electrode material and internal gaps of the battery, etc.) that affect the injection effect, and as the battery capacity increases, the injection time becomes longer and longer, resulting in low production efficiency. Summary of the Invention

[0005] Based on this, it is necessary to provide a liquid injection device that can reduce the liquid injection time to improve production efficiency in order to solve the problem that lithium battery liquid injection takes a long time and leads to low production efficiency.

[0006] A liquid injection device, comprising:

[0007] a sealing mechanism having a sealed cavity for accommodating the battery;

[0008] an injection mechanism for temporarily storing electrolyte, configured to communicate with the injection port of the battery to inject electrolyte into the battery through the injection port; the injection mechanism is in communication with the sealed cavity, the sealing mechanism having a gas port in communication with the sealed cavity, the gas port being configured to communicate with a vacuum generating mechanism to extract gas from the sealed cavity, the injection mechanism, and the battery, or to communicate with a positive pressure generating mechanism to fill the sealed cavity, the injection mechanism, and the battery with high-pressure gas;

[0009] A vibration mechanism that can be at least partially disposed in the injection mechanism is used to send ultrasonic waves to the electrolyte in the injection mechanism. The electrolyte vibrates under the action of the ultrasonic waves, and the electrolyte can drive the ultrasonic waves to propagate into the interior of the battery.

[0010] With this setup, when the electrolyte is injected into the battery via the injection mechanism, ultrasonic waves propagate directionally into the battery, generating cavitation within the electrolyte. Small bubbles continuously precipitate from gaps and cavities within the battery. Simultaneously, the ultrasonic vibrations cause the cells within the battery shell to become fluffy. This allows for more gas to be extracted during subsequent vacuuming, and when high pressure is applied, the liquid level in the battery drops more quickly, making it easier to achieve saturation, reducing injection time and improving production efficiency.

[0011] In one embodiment, the vibration mechanism includes an ultrasonic generator, an ultrasonic transducer and an ultrasonic amplifier. The ultrasonic generator is used to convert electrical energy into an electrical signal that matches the ultrasonic transducer. The ultrasonic transducer is used to convert electrical power into mechanical power output. The ultrasonic amplifier is used to amplify the particle displacement or velocity of the mechanical vibration.

[0012] In one embodiment, the liquid injection mechanism has a liquid outlet, and the liquid outlet is used to communicate with the liquid injection port of the battery; the distance between the vibration mechanism and the plane where the liquid outlet is located is less than a preset threshold; and / or

[0013] The vibration mechanism extends in a direction perpendicular to the plane where the liquid injection port is located, and is arranged in the liquid injection mechanism through the outside.

[0014] In one embodiment, the liquid injection device further includes a heating mechanism, which can be at least partially accommodated in the sealed cavity and in contact with the battery to continuously heat the battery.

[0015] In one embodiment, the heating mechanism includes a heating plate and a heat source. The heating plate can be accommodated in the sealed cavity and in contact with the battery. A flow channel is provided in the heating plate. The heat source can provide a heat exchange medium into the flow channel so that the heating plate heats the battery; alternatively, the heat source can generate heat itself to conduct heat to the heating plate so that the heating plate heats the battery.

[0016] In one embodiment, the air port includes a first air port and a second air port that are independently provided, the first air port is configured to communicate with the vacuum generating mechanism, and the second air port is configured to communicate with the positive pressure generating mechanism.

[0017] In one embodiment, the liquid injection device includes the vacuum generating mechanism, the vacuum generating mechanism includes a vacuum pipeline and a first control valve, the vacuum pipeline is connected between the first air port and the vacuum source, and the first control valve is provided on the vacuum pipeline for controlling the connection between the vacuum source and the first air port; and / or

[0018] The liquid injection device also includes the positive pressure generating mechanism, which includes an air storage tank, a positive pressure pipeline and a second control valve. The positive pressure pipeline is connected between the air storage tank and the second air port. The air storage tank is connected to a positive pressure air source. The second control valve is arranged on the positive pressure pipeline to control the connection and disconnection between the air storage tank and the second air port.

[0019] In one embodiment, the liquid injection device further includes a liquid storage tank and a metering pump, wherein the metering pump is arranged between the liquid storage tank and the liquid injection mechanism; the liquid storage tank is used to store electrolyte, and the metering pump is used to quantitatively transport the electrolyte in the liquid storage tank into the liquid injection mechanism.

[0020] In one embodiment, the liquid injection mechanism can be accommodated in the sealing mechanism, and the liquid injection mechanism has a communication port, and the liquid injection mechanism is connected with the sealing cavity through the communication port.

[0021] In one embodiment, the liquid injection mechanism is located outside the sealed cavity, and the liquid injection device further includes a connecting pipe, which connects the liquid injection mechanism and the sealing mechanism, and the liquid injection mechanism is connected to the sealed cavity through the connecting pipe.

[0022] In one embodiment, the connection position between the connecting pipe and the liquid injection mechanism is higher than the calibration position of the electrolyte stored in the liquid injection mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a schematic structural diagram of a liquid injection device provided in one embodiment of the present application;

[0024] FIG2 is a schematic structural diagram of a liquid injection device provided in another embodiment of the present application.

[0025] Explanation of reference numerals: 100, liquid injection device; 10, sealing mechanism; 11, sealing chamber; 12, first air port; 13, second air port; 20, liquid injection mechanism; 21, connecting port; 30, vibration mechanism; 40, connecting pipeline; 50, heating plate; 200, battery. DETAILED DESCRIPTION

[0026] To make the above-mentioned objects, features, and advantages of the present disclosure more clearly understood, specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present disclosure. However, the present disclosure can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without violating the scope of the present disclosure. Therefore, the present disclosure is not limited to the specific embodiments disclosed below.

[0027] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present disclosure.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the present disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0029] In this disclosure, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components, unless otherwise expressly limited. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on specific circumstances.

[0030] In the present disclosure, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0031] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0032] 1 , an embodiment of the present application provides a liquid injection device 100 for injecting electrolyte into a battery 200 .

[0033] The liquid injection device 100 includes a sealing mechanism 10 and a liquid injection mechanism 20. The sealing mechanism 10 has a sealed cavity 11 for accommodating a battery 200. The liquid injection mechanism 20 is used to temporarily store electrolyte and is in communication with the sealed cavity 11. During liquid injection, the battery 200 is placed in the sealed cavity 11, and its liquid injection port is in communication with the liquid injection mechanism 20. The liquid injection mechanism 20 is used to inject electrolyte into the interior of the battery 200 through the liquid injection port.

[0034] It should be noted that the shapes and sizes of the sealing mechanism 10 and the injection mechanism 20 are not limited and can be selected based on specific working conditions. For example, in some embodiments, the injection mechanism 20 is a cup-shaped structure, and the sealing mechanism 10 is a rectangular hollow structure. It should also be noted that the materials used for the sealing mechanism 10 and the injection mechanism 20 are also not limited; both the sealing mechanism 10 and the injection mechanism 20 can be made of materials that can withstand high pressures.

[0035] The sealing mechanism 10 has an air port, which is connected to the sealed cavity 11. The air port is configured to be connected to a vacuum generating mechanism or a positive pressure generating mechanism. The vacuum generating mechanism can extract gas from the sealed cavity 11, the liquid injection mechanism 20, and the battery 200 contained in the sealed cavity 11 and connected to the liquid injection mechanism 20 through the air port, so that the pressure in the sealed cavity 11, the liquid injection mechanism 20, and the battery 200 is lower than atmospheric pressure. The positive pressure generating mechanism can fill the sealed cavity 11, the liquid injection mechanism 20, and the battery 200 contained in the sealed cavity 11 and connected to the liquid injection mechanism 20 with high-pressure gas through the air port, so that the pressure in the sealed cavity 11, the liquid injection mechanism 20, and the battery 200 is higher than atmospheric pressure. For example, the pressure values ​​reached by the sealed cavity 11, the liquid injection mechanism 20, and the battery 200 can be: 1.0 MPa, 1.2 MPa, 1.5 MPa...2.0 MPa, etc.

[0036] It should be noted here that, whether vacuuming or filling with high-pressure gas, when the pressure is stable, the pressure inside and outside the battery is the same.

[0037] With the above arrangement, when electrolyte needs to be injected into the battery 200, the battery 200 is placed in the sealed chamber 11 and connected to the injection mechanism 20. The vacuum generating mechanism extracts gas from the injection mechanism 20 and the battery 200, placing the injection mechanism 20 and the battery 200 in a vacuum state, and then injects electrolyte into the injection mechanism 20. Under the action of the pressure differential, the electrolyte flows from the injection mechanism 20 into the battery 200, completing the battery 200 injection process. The positive pressure generating mechanism fills the sealed chamber 11, the injection mechanism 20, and the battery 200 with gas, placing the sealed chamber 11, the injection mechanism 20, and the battery 200 in a positive pressure state. The vacuum generating mechanism extracts gas from the sealed chamber 11, the injection mechanism 20, and the battery 200, placing the sealed chamber 11, the injection mechanism 20, and the battery 200 in a vacuum state. This process of evacuating the sealed chamber 11, the injection mechanism 20, and the battery 200 and filling it with high-pressure gas is repeated multiple times until the infiltration process of the battery 200 injection process is completed.

[0038] The liquid injection device 100 further includes a vibration mechanism 30, at least a portion of which can be accommodated within the liquid injection mechanism 20. The vibration mechanism 30 is configured to transmit ultrasonic waves to the electrolyte within the liquid injection mechanism 20. The electrolyte vibrates under the influence of the ultrasonic waves, and the electrolyte can drive the ultrasonic waves to propagate into the interior of the battery 200. Specifically, during the liquid injection process, the vibration mechanism 30 can transmit ultrasonic waves to the electrolyte in the liquid injection mechanism 20, causing the electrolyte to vibrate under the influence of the ultrasonic waves. Simultaneously, as the electrolyte flows from the liquid injection mechanism 20 to the battery 200, the ultrasonic waves can propagate along the electrolyte into the interior of the battery 200.

[0039] With the above arrangement, when the electrolyte is injected into the battery 200 via the injection mechanism 20, ultrasonic waves can be directed into the battery 200, generating cavitation in the electrolyte. Small bubbles are continuously released from the gaps and cavities within the battery 200. Simultaneously, the ultrasonic vibrations can cause the cells within the battery 200 to become fluffy. This allows more gas to be extracted from the battery 200 during subsequent vacuuming, and when high pressure is applied, the liquid level in the battery 200 can be lowered more quickly, making it easier to wet the battery 200, reducing injection time and improving production efficiency.

[0040] It's important to note that ultrasonic cavitation refers to the dynamic process by which tiny cavitation bubbles, formed by microscopic gas nuclei in a liquid, vibrate under the influence of sound waves, and then grow and collapse when the sound pressure reaches a certain value. Specifically, tiny bubble nuclei in a liquid vibrate under the influence of ultrasound. When the positive pressure reaches a certain value, the bubbles rapidly expand and then suddenly close, generating a shock wave as the bubbles close. This series of dynamic processes—expansion, closing, and oscillation—is called ultrasonic cavitation.

[0041] Continuing with FIG1 , the air port includes a first air port 12 and a second air port 13, which are independent of each other. The first air port 12 is configured to communicate with the vacuum generating mechanism, and the second air port 13 is configured to communicate with the positive pressure generating mechanism. Of course, in other embodiments, the sealing mechanism 10 may be provided with only one air port, which is controlled by a valve to selectively communicate with either the vacuum generating mechanism or the positive pressure generating mechanism.

[0042] In some embodiments, the liquid injection device 100 includes the aforementioned vacuum generating mechanism, which includes a vacuum line and a first control valve. The vacuum line connects the first gas port 12 to a vacuum source, and the first control valve is disposed on the vacuum line to control the flow between the vacuum source and the first gas port 12. Thus, by controlling the flow rate and opening and closing speed of the first control valve, the vacuum flow rate and pressure in the sealed chamber 11 can be controlled. Specifically, the vacuum source can be a factory vacuum source or a vacuum pump, for example.

[0043] The liquid injection device 100 also includes the aforementioned positive pressure generating mechanism, which comprises an air tank, a positive pressure pipeline, and a second control valve. The positive pressure pipeline connects the air tank to the second air port 13, which in turn connects to a positive pressure air source. The second control valve is located on the positive pressure pipeline and controls the flow rate and pressure within the sealed chamber 11 by controlling the opening and closing of the second control valve. Specifically, the air tank is connected to a high-pressure air source or nitrogen source in the factory.

[0044] In some embodiments, referring again to FIG1 , the liquid injection mechanism 20 can be accommodated in the sealing mechanism 10 , and the liquid injection mechanism 20 has a communication port 21 , through which the liquid injection mechanism 20 communicates with the sealed cavity 11 . Thus, when the sealed cavity 11 is evacuated or high-pressure gas is injected into the sealed cavity 11 , since the liquid injection mechanism 20 communicates with the sealed cavity 11 through the communication port 21 and is also in communication with the liquid injection port of the battery 200 , the liquid injection mechanism 20 and the battery 200 are also evacuated or filled with high-pressure gas.

[0045] In other embodiments, referring to FIG2 , the liquid injection mechanism 20 is located outside the sealed cavity 11, and the liquid injection device 100 further includes a connecting pipe 40, which connects the liquid injection mechanism 20 and the sealing mechanism 10. The liquid injection mechanism 20 is in communication with the sealed cavity 11 via the connecting pipe 40. In this way, when the sealed cavity 11 is evacuated or high-pressure gas is injected into the sealed cavity 11, since the liquid injection mechanism 20 is in communication with the sealed cavity 11 via the connecting pipe 40 and the liquid injection mechanism 20 is in communication with the liquid injection port of the battery 200, the liquid injection mechanism 20 and the battery 200 are also evacuated or injected with high-pressure gas.

[0046] Furthermore, the connection point between the connecting pipe 40 and the injection mechanism 20 is higher than the calibrated position of the electrolyte stored in the injection mechanism 20. Generally, the injection mechanism 20 stores a fixed amount of electrolyte so that the amount of electrolyte just meets the needs of the battery 200. The calibrated position is the position in the injection mechanism 20 where the upper surface of the electrolyte is located when the injection mechanism 20 just stores the fixed amount of electrolyte. Because the connection point between the connecting pipe 40 and the injection mechanism 20 is higher than the calibrated position, when the electrolyte is injected into the injection mechanism 20, it is ensured that the electrolyte will not flow into the sealed cavity 11 through the connecting pipe 40, thereby achieving the purpose of quantitatively injecting the battery 200.

[0047] The injection device 100 also includes a liquid storage tank and a metering pump, which is arranged between the liquid storage tank and the injection mechanism 20. The liquid storage tank is used to store electrolyte, and the metering pump is used to transfer the electrolyte charge in the liquid storage tank to the injection mechanism 20 to ensure the effect of quantitative injection of the battery 200.

[0048] In some embodiments, the liquid injection mechanism 20 has a liquid outlet that is sealed and connected to the liquid injection port of the battery 200. Specifically, the liquid outlet of the liquid injection mechanism 20 and the liquid injection port of the battery 200 are sealed by a sealing rubber member. The distance between the vibration mechanism 30 and the plane where the liquid outlet is located is less than a preset threshold to ensure that the ultrasonic waves it emits can propagate along with the electrolyte into the interior of the battery 200.

[0049] It should be noted that the preset threshold is as small as possible and is set so as not to interfere with the normal flow of the electrolyte into the battery 200.

[0050] Preferably, the vibration mechanism 30 extends in a direction perpendicular to the plane of the liquid injection port and is disposed in the liquid injection mechanism 20 through the outside. In this way, the ultrasonic waves emitted by the vibration mechanism 30 can act more on the electrolyte, ensuring the liquid injection effect.

[0051] The vibration mechanism 30 includes an ultrasonic generator, an ultrasonic transducer, and an ultrasonic amplifier. The ultrasonic generator converts electrical energy into an electrical signal that matches the ultrasonic transducer. The ultrasonic transducer converts electrical power into mechanical power output. The ultrasonic amplifier (also known as an ultrasonic shifter or ultrasonic concentrator) amplifies the displacement or velocity of the mechanical vibration particles, concentrating the ultrasonic energy on a small area for energy collection. This arrangement enables the vibration mechanism 30 to input ultrasonic waves with a large amplitude.

[0052] Specifically, the ultrasonic generator is an ultrasonic / ultra-frequency generator, and the ultrasonic transducer is an ultrasonic / ultra-frequency vibration head.

[0053] In some embodiments, the injection device 100 further includes a heating mechanism, at least a portion of which can be accommodated within the sealed cavity 11 and in contact with the battery 200 to continuously heat the battery 200. The heating mechanism heats the battery 200, thereby increasing the temperature of the electrolyte entering the battery 200. This increases molecular motion within the electrolyte, improves electrolyte fluidity, and reduces viscosity. This allows more gas to be extracted during vacuum, and when high pressure is applied, the liquid level within the battery 200 drops more rapidly, further accelerating the infiltration process, reducing injection time, and improving production efficiency.

[0054] Furthermore, the heating mechanism includes a heating plate 50 and a heat source. The heating plate 50 can be accommodated in the sealed cavity 11 and in contact with the battery 200. The heat source can make the heating plate 50 generate heat and heat the battery 200. In some specific embodiments, a flow channel is provided in the heating plate 50, and the heat source can provide a heat exchange medium into the flow channel. The heat exchange medium flows in the flow channel to exchange heat with the heating plate 50, and the temperature of the heating plate 50 increases to heat the battery 200. Specifically, the heat exchange medium can be water, heating oil or gas (air), etc. Correspondingly, the heat source is a water temperature machine, an oil temperature machine or a gas heater. In other specific embodiments, the heat source can generate heat by itself and conduct heat to the heating plate 50, so that the temperature of the heating plate 50 increases and heats the battery. Specifically, the heat source is an electric heating plate or an electric heating wire, etc.

[0055] In some embodiments, the heating mechanism is further provided with a temperature control component, which can control the temperature of the heating plate 50. The temperature control component can be a thermocouple, a temperature control switch, or a control circuit.

[0056] It should be noted that when the heating plate 50 is placed in the sealed cavity 11 and contacts the battery 200, the heating plate 50 is in surface contact with the battery 200. The contact surface of the battery 200 is not limited to the bottom or side surface of the battery 200. In some other embodiments, the heating plate 50 may also be the top surface of the battery 200.

[0057] When using the liquid injection device 100 provided in this application to perform liquid injection, the following liquid injection steps can be used:

[0058] The battery 200 is placed in the sealing cavity 11 of the sealing mechanism 10 so that the battery 200 is in surface contact with the heating plate 50 . The heating plate 50 continues to heat the battery 200 until the battery 200 is taken out after the liquid injection is completed.

[0059] The liquid outlet of the liquid injection mechanism 20 is sealed and connected to the liquid injection port of the battery 200;

[0060] The vacuum generating mechanism evacuates the sealed cavity 11, the liquid injection mechanism 20 and the battery 200;

[0061] The battery 200 is kept in a vacuum state, and the metering pump quantitatively delivers the electrolyte in the liquid storage tank to the liquid injection mechanism 20 for storage;

[0062] Under the action of the pressure difference, the electrolyte in the injection mechanism 20 is injected into the battery 200. During this process, the vibration mechanism 30 emits ultrasonic waves. The electrolyte vibrates under the action of the ultrasonic waves and can drive the ultrasonic waves to propagate directionally into the battery 200.

[0063] The positive pressure generating mechanism injects gas into the sealed cavity 11, the liquid injection mechanism 20, and the battery 200, placing them in a positive pressure state. The vacuum generating mechanism extracts gas from the sealed cavity 11, the liquid injection mechanism 20, and the battery 200, placing them in a vacuum state. This process of evacuating the sealed cavity 11, the liquid injection mechanism 20, and the battery 200 and filling them with high-pressure gas is repeated multiple times until the battery 200 is fully injected.

[0064] The liquid injection device 100 provided in the embodiment of the present application has the following beneficial effects:

[0065] 1. The ultrasonic wave emitted by the vibration mechanism 30 can assist in the injection of the battery 200. That is, in the process of injecting the electrolyte into the battery 200 in the injection mechanism 20, the ultrasonic wave can send high-frequency vibrations to the electrolyte, and propagate directionally through the electrolyte through the injection port to the inside of the battery 200 (the ultrasonic wave propagates with the electrolyte as the propagation medium), and produces cavitation in the electrolyte. Tiny bubbles are constantly precipitated from the gaps and cavities inside the battery 200. At the same time, the ultrasonic wave makes the battery 200 inside the battery shell 200 fluffy, promotes the absorption of the electrolyte inside the battery 200, and the electrolyte is easier to achieve the infiltration effect. More gas can be extracted during the subsequent vacuum pumping, and the liquid level in the battery 200 drops faster when high pressure is applied. Ultrasonic waves can speed up the injection process, reduce the injection time, and improve production efficiency.

[0066] 2. Throughout the entire filling process, the heating mechanism continuously heats the battery 200, raising the temperature of the electrolyte within the battery 200. This increases the molecular motion within the electrolyte, improves electrolyte fluidity, and reduces viscosity. This allows for more gas to be extracted during vacuum pumping, and the liquid level within the battery 200 to drop more quickly when high pressure is applied, further accelerating the infiltration process, reducing filling time, and improving production efficiency.

[0067] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The above embodiments merely illustrate several implementations of the present disclosure, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the scope of the present disclosure, all of which fall within the scope of protection of the present disclosure. Therefore, the scope of protection of the patent disclosed herein shall be determined by the appended claims.

Claims

1. A liquid injection device, characterized in that: include: A sealing mechanism (10) having a sealed cavity (11) for accommodating a battery (200); a liquid injection mechanism (20) for temporarily storing electrolyte, for communicating with the liquid injection port of the battery (200) to inject electrolyte into the battery (200) through the liquid injection port; the liquid injection mechanism (20) is in communication with the sealed cavity (11); the sealing mechanism (10) has a gas port in communication with the sealed cavity (11); the gas port is configured to communicate with a vacuum generating mechanism to extract gas from the sealed cavity (11), the liquid injection mechanism (20) and the battery (200), or to communicate with a positive pressure generating mechanism to fill the sealed cavity (11), the liquid injection mechanism (20) and the battery (200) with high-pressure gas; A vibration mechanism (30) can be at least partially disposed in the injection mechanism (20), and is used to send ultrasonic waves to the electrolyte in the injection mechanism (20); the electrolyte vibrates under the action of the ultrasonic waves, and the electrolyte can drive the ultrasonic waves to propagate into the interior of the battery (200).

2. The liquid injection device according to claim 1, characterized in that The vibration mechanism (30) includes an ultrasonic generator, an ultrasonic transducer and an ultrasonic amplifier. The ultrasonic generator is used to convert electrical energy into an electrical signal that matches the ultrasonic transducer. The ultrasonic transducer is used to convert electrical power into mechanical power output. The ultrasonic amplifier is used to amplify the particle displacement or velocity of the mechanical vibration.

3. The liquid injection device according to claim 1, characterized in that The liquid injection mechanism (20) has a liquid outlet, the liquid outlet being connected to the liquid injection port of the battery (200); the distance between the vibration mechanism (30) and the plane where the liquid outlet is located is less than a preset threshold; and / or The vibration mechanism (30) extends in a direction perpendicular to the plane where the liquid injection port is located, and is inserted into the liquid injection mechanism (20) through the outside.

4. The liquid injection device according to claim 1, characterized in that The liquid injection device further comprises a heating mechanism, which can be at least partially accommodated in the sealed cavity (11) and in contact with the battery (200) to continuously heat the battery (200).

5. The liquid injection device according to claim 4, characterized in that The heating mechanism comprises a heating plate (50) and a heat source. The heating plate (50) can be accommodated in the sealed cavity (11) and in contact with the battery (200). A flow channel is provided in the heating plate (50). The heat source can provide a heat exchange medium into the flow channel, so that the heating plate (50) heats the battery (200); or the heat source can generate heat itself to conduct heat to the heating plate (50), so that the heating plate (50) heats the battery (200).

6. The liquid injection device according to claim 1, characterized in that The air port comprises a first air port (12) and a second air port (13) which are independently arranged. The first air port (12) is configured to communicate with the vacuum generating mechanism, and the second air port (13) is configured to communicate with the positive pressure generating mechanism.

7. The liquid injection device according to claim 6, characterized in that The liquid injection device comprises the vacuum generating mechanism, the vacuum generating mechanism comprises a vacuum pipeline and a first control valve, the vacuum pipeline is connected between the first gas port (12) and the vacuum source, the first control valve is arranged on the vacuum pipeline and is used to control the connection and disconnection between the vacuum source and the first gas port (12); and / or The liquid injection device also includes the positive pressure generating mechanism, which includes an air storage tank, a positive pressure pipeline and a second control valve. The positive pressure pipeline is connected between the air storage tank and the second air port (13). The air storage tank is connected to a positive pressure air source. The second control valve is arranged on the positive pressure pipeline and is used to control the connection and disconnection between the air storage tank and the second air port (13).

8. The liquid injection device according to claim 1, characterized in that The liquid injection device further comprises a liquid storage tank and a metering pump, wherein the metering pump is arranged between the liquid storage tank and the liquid injection mechanism (20); the liquid storage tank is used to store electrolyte, and the metering pump is used to quantitatively transport the electrolyte in the liquid storage tank into the liquid injection mechanism (20).

9. The liquid injection device according to any one of claims 1 to 8, characterized in that: The liquid injection mechanism (20) can be accommodated in the sealing mechanism (10), and the liquid injection mechanism (20) has a communication port (21). The liquid injection mechanism (20) is communicated with the sealing cavity (11) through the communication port (21).

10. The liquid injection device according to any one of claims 1 to 8, characterized in that: The liquid injection mechanism (20) is located outside the sealed cavity (11), and the liquid injection device further comprises a connecting pipe (40), wherein the connecting pipe (40) connects the liquid injection mechanism (20) and the sealing mechanism (10), and the liquid injection mechanism (20) is connected to the sealed cavity (11) via the connecting pipe (40).

11. The liquid injection device according to claim 10, characterized in that: The communication position between the communication pipeline (40) and the liquid injection mechanism (20) is higher than the calibration position of the electrolyte stored in the liquid injection mechanism (20).

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