Liquid injection device

Abstract

The utility model discloses a liquid injection device, and relates to the technical field of battery production. The liquid injection device is used for injecting liquid into the battery cell and comprises a liquid storage cup, a liquid injection piece and an atomization mechanism; the liquid storage cup is used for supplying electrolyte; the liquid injection part is at least partially inserted into the battery cell; the atomizing mechanism is arranged between the liquid storage cup and the liquid injection part, and the atomizing mechanism is used for atomizing the electrolyte flowing through the atomizing mechanism, so that the atomized electrolyte is injected into the battery cell through the liquid injection part. Therefore, after the electrolyte is atomized by the atomizing mechanism, the electrolyte injected into the battery cell is in a tiny liquid drop shape, so that the interior of the battery cell can be fully infiltrated in the liquid injection stage; compared with the prior art, high-temperature standing is not needed, the total time of liquid injection is saved, the liquid injection efficiency is improved, and the infiltration effect of the electrolyte is also improved.

Description

Technical Field

[0001] This application belongs to the field of battery manufacturing technology, specifically relating to a liquid injection device. Background Technology

[0002] Battery electrolyte filling is a critical step in lithium-ion battery production, directly affecting the battery's electrolyte wettability, cycle life, and safety. During the electrolyte filling process, the electrolyte needs to fully wet the electrode components to ensure the continuous occurrence of electrochemical reactions, prevent localized overheating, and extend the battery's cycle life.

[0003] In related technologies, the wetting effect of electrolyte is generally improved by means of vacuuming and allowing it to stand, but such methods take a long time and the wetting effect is not good. Utility Model Content

[0004] This application aims to provide a liquid injection device that can solve the problem in related technologies that improve the wetting effect of electrolyte by means of vacuuming and settling, but such methods take a long time and the wetting effect is not good.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, embodiments of this application propose a liquid injection device for injecting electrolyte into a battery cell. The liquid injection device includes a liquid storage cup for supplying electrolyte.

[0007] Liquid injection device, said liquid injection device being adapted to be at least partially inserted into the battery cell;

[0008] An atomizing mechanism is provided between the liquid storage cup and the liquid injection component. The atomizing mechanism is used to atomize the flowing electrolyte so that the atomized electrolyte is injected into the battery cell through the liquid injection component.

[0009] Optionally, the liquid injection component is provided with a liquid injection channel, and the end of the liquid injection component away from the liquid storage cup is provided with a spray hole. The end of the liquid injection component with the spray hole is adapted to be inserted into the battery cell. One end of the liquid injection channel is connected to the atomizing mechanism, and the other end of the liquid injection channel is connected to the spray hole. The spray hole is used to spray the atomized electrolyte into the battery cell.

[0010] Optionally, the end of the injection component away from the liquid storage cup is provided with a ball head, and the ball head is provided with a plurality of spray holes, which are arranged at intervals.

[0011] Optionally, the liquid injection device further includes a first control element, which is electrically connected to the atomizing mechanism. The first control element is used to control the operation of the atomizing mechanism and adjust the working mode of the atomizing mechanism. In the first mode, the atomizing mechanism intermittently atomizes the electrolyte; in the second mode, the atomizing mechanism continuously atomizes the electrolyte.

[0012] Optionally, the atomizing mechanism includes a body and an atomizing element. One end of the body is connected to the liquid storage cup, and the other end of the body is connected to the liquid injection element. The body has a connecting cavity that connects the liquid storage cup and the liquid injection element. The atomizing element is disposed in the connecting cavity and is used to atomize the electrolyte flowing through the connecting cavity.

[0013] Optionally, the atomizing element includes any one of a piezoelectric atomizer, an ultrasonic atomizer, and a thermal atomizer.

[0014] Optionally, the liquid injection device further includes a support assembly and a heating element. The support assembly has a receiving cavity for placing the battery cell. The heating element is disposed on at least one side wall of the receiving cavity and is used to heat the battery cell.

[0015] Optionally, the liquid injection device further includes a second control element, which is electrically connected to the heating element and is used to control the start and stop of the heating element to heat the battery cell.

[0016] Optionally, the liquid injection device further includes an air passage unit, at least one side wall of the receiving cavity is provided with a telescopic member, an air cavity is formed in the telescopic member, the air passage unit is connected to the liquid storage cup and the air cavity respectively, the air passage unit is used to provide air pressure to the liquid storage cup and the air cavity, the telescopic member can expand or contract with the air pressure to squeeze and support the battery cell; the heating element is disposed in the air cavity.

[0017] Optionally, the gas circuit unit includes a gas source, a first pipeline, and a second pipeline. One end of the first pipeline is connected to the gas source, and the other end of the first pipeline is connected to the liquid storage cup. One end of the second pipeline is connected to the gas source, and the other end of the second pipeline is connected to the gas chamber.

[0018] In embodiments of this application, a liquid injection device is used to inject electrolyte into a battery cell, comprising: a reservoir cup, an injection element, and an atomizing mechanism; the reservoir cup is used to supply electrolyte; the injection element is adapted to at least partially insert into the battery cell; the atomizing mechanism is disposed between the reservoir cup and the injection element, and the atomizing mechanism is used to atomize the flowing electrolyte so that the atomized electrolyte is injected into the battery cell through the injection element. Thus, after the electrolyte is atomized by the atomizing mechanism, the electrolyte injected into the battery cell is in the form of tiny droplets, thereby enabling sufficient wetting of the battery cell interior during the injection stage; compared with related technologies, high-temperature settling is unnecessary, saving the total injection time, improving injection efficiency, and enhancing the wetting effect of the electrolyte.

[0019] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0021] Figure 1 This is a schematic diagram of an injection device according to an embodiment of this application;

[0022] Figure 2 This is a partial schematic diagram of the liquid injection device during liquid injection according to an embodiment of this application;

[0023] Figure 3 This is a schematic diagram showing the connection between the atomizing mechanism and the liquid injection component according to an embodiment of this application;

[0024] Figure 4 This is a partial schematic diagram of the injection component according to an embodiment of this application;

[0025] Figure 5 This is a schematic diagram of the expandable component according to an embodiment of this application when it expands;

[0026] Figure 6 This is a schematic diagram of the retractable component retracting according to an embodiment of this application.

[0027] Figure label:

[0028] 1: Battery cell; 11: Electrode assembly; 2: Liquid reservoir; 3: Liquid injection component; 31: Liquid injection channel; 32: Nozzle; 33: Ball head; 4: Atomizing mechanism; 41: Body; 411: Connecting cavity; 42: Atomizing component; 5: Support assembly; 51: Receiving cavity; 6: Air circuit unit; 61: Air source; 62: First pipeline; 63: Second pipeline; 7: Telescopic component; 71: Air chamber. Detailed Implementation

[0029] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0030] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0031] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] Before explaining the liquid injection device provided in the embodiments of this application, the application scenarios of the liquid injection device provided in the embodiments of this application will be specifically described:

[0034] Battery electrolyte filling is a crucial process involving the precise injection of electrolyte into the battery cell. It directly impacts battery performance (energy density, cycle life) and safety (leakage, gas generation). Related technologies typically include the following steps: primary electrolyte filling → high-temperature settling → negative pressure formation → high-temperature aging → secondary electrolyte filling → sealing pin welding → secondary helium detection. Since the electrolyte is injected into the cell via pressure differential, the aforementioned high-temperature settling process is necessary to increase the electrolyte's wetting rate. However, this process is time-consuming and the wetting effect is not ideal.

[0035] Therefore, this application provides a liquid injection device. The liquid injection device provided in this application will be described in detail below with reference to the accompanying drawings and specific embodiments and application scenarios.

[0036] like Figure 1 As shown, according to some embodiments of this application, a liquid injection device is used to inject electrolyte into a battery cell 1. The liquid injection device includes a liquid storage cup 2, a liquid injection component 3, and an atomizing mechanism 4. The liquid storage cup is used to supply electrolyte, the liquid injection component 3 is adapted to be at least partially inserted into the battery cell 1, and the atomizing mechanism 4 is disposed between the liquid storage cup 2 and the liquid injection component 3. The atomizing mechanism 4 is used to atomize the flowing electrolyte so as to inject the atomized electrolyte into the battery cell 1 through the liquid injection component 3.

[0037] In this embodiment, after the atomizing mechanism 4 atomizes the electrolyte, the electrolyte injected into the battery cell 1 by the injection component 3 is in the form of tiny droplets, which can fully wet the inside of the battery cell 1 during the injection stage. Compared with related technologies, there is no need for high-temperature standing, which saves the total injection time, improves the injection efficiency, and also improves the wetting effect of the electrolyte.

[0038] It should be noted that the atomizing mechanism 4 atomizes the flowing electrolyte, specifically by breaking the liquid electrolyte into tiny droplets to form a mist-like electrolyte. When the liquid injection component 3 injects the mist-like electrolyte into the battery cell 1, it can fully wet the electrode assembly 11 inside the battery cell 1.

[0039] Understandably, such as Figure 2 As shown, the electrode assembly 11 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets to separate them and prevent internal short circuits. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 11.

[0040] Understandably, an electrolyte is a solution containing free ions that can conduct electricity. It plays a crucial role in electrochemical reactions; the ions in the electrolyte can conduct charge, while the electrolyte ensures the stability of the electrochemical reaction. Electrolytes can include at least one of the following: acidic electrolytes, such as sulfuric acid; alkaline electrolytes, such as potassium hydroxide; and organic electrolytes, such as lithium salts dissolved in organic solvents. Those skilled in the art can configure the electrolyte according to actual needs, and this application does not impose any limitations on this.

[0041] In specific applications, the atomizing mechanism 4 may include any one of the following: ultrasonic atomizing mechanism, pneumatic atomizing mechanism, mechanical atomizing mechanism, pressure atomizing mechanism, electric atomizing mechanism, or oscillating atomizing mechanism. Those skilled in the art may configure it according to actual needs, and this application does not impose any restrictions on it.

[0042] Specifically, such as Figure 1 As shown, the electrolyte is stored in a storage cup 2 before injection. The storage cup 2 is connected to an atomizing mechanism 4. The end of the atomizing mechanism 4 away from the storage cup 2 is connected to an injection component 3. The injection component 3 is at least partially inserted into the battery cell 1. When the electrolyte in the storage cup 2 flows to the battery cell 1, the atomizing mechanism 4 atomizes the flowing electrolyte. The atomized electrolyte flows into the injection component 3. The injection component 3 can inject the atomized electrolyte into the battery cell 1, thereby improving the wetting effect of the electrolyte.

[0043] like Figures 1 to 4 As shown, in some embodiments of this application, the liquid injection component 3 is provided with a liquid injection channel 31, and the end of the liquid injection component 3 away from the liquid storage cup 2 is provided with a spray hole 32. The end of the liquid injection component 3 with the spray hole 32 is suitable for insertion into the battery cell 1. One end of the liquid injection channel 31 is connected to the atomizing mechanism 4, and the other end of the liquid injection channel 31 is connected to the spray hole 32. The spray hole 32 is used to spray the atomized electrolyte into the battery cell 1.

[0044] In this embodiment, one end of the injection channel 31 is connected to the atomizing mechanism 4. The electrolyte atomized by the atomizing mechanism 4 flows into the injection channel 31 and is then sprayed into the battery cell 1 through the nozzle 32 at the other end of the injection channel 31. The end of the injection component 3 with the nozzle 32 is suitable for insertion into the battery cell 1, which can ensure that all the electrolyte is injected into the battery cell 1, reduce electrolyte waste, and improve injection efficiency.

[0045] In specific applications, such as Figure 2 As shown, multiple nozzles 32 can be configured, and multiple nozzles 32 can spray electrolyte simultaneously, thereby increasing the electrolyte injection speed.

[0046] Understandably, the aperture of the nozzle 32 is similar to the diameter of the tiny droplets of the atomized electrolyte, thereby improving the atomization effect. For example, the atomizing mechanism 4 is a high-pressure pump. The high-pressure pump pressurizes the flowing electrolyte, which is then ejected through the nozzle 32. Due to the small aperture of the nozzle 32, the electrolyte is sheared into tiny droplets, forming a mist-like electrolyte. The aperture size of the nozzle 32 can be set according to actual needs, as long as it can quickly inject the mist-like electrolyte into the battery cell 1. Those skilled in the art can set it according to actual needs, and this application does not impose any limitations on this.

[0047] like Figures 2 to 4 As shown, in some embodiments of this application, the end of the injection component 3 away from the liquid storage cup 2 is provided with a ball head 33, and the ball head 33 is provided with a plurality of spray holes 32, which are arranged at intervals.

[0048] In this embodiment of the application, by providing multiple spray holes 32 at intervals on the ball head 33, the atomized electrolyte can be sprayed into the battery cell 1 from multiple directions, thereby covering a larger area inside the battery cell 1 and improving the wetting effect of the electrolyte.

[0049] It should be noted that in actual use, the ball head 33 is inserted into the inside of the battery cell 1, and the electrolyte flows to the ball head 33 through the injection channel 31 and is then sprayed into the inside of the battery cell 1 through multiple nozzles 32.

[0050] In specific applications, such as Figure 2 As indicated by the arrow, the atomized electrolyte is sprayed from multiple nozzles 32 and can be sprayed into the interior of the battery cell 1 from multiple directions. This allows the electrolyte inside the battery cell 1 to cover a larger area, meaning it can contact more areas of the electrode assembly 11, thereby improving the wetting effect of the electrolyte.

[0051] It should be explained that the multiple nozzles 32 are arranged at intervals, specifically they can be arranged randomly or in an array, as long as they can satisfy the requirement that the electrolyte is sprayed into the cell 1 from multiple directions. Those skilled in the art can set them according to actual needs, and this application does not limit them.

[0052] In some embodiments of this application, the liquid injection device further includes a first control element, which is electrically connected to the atomizing mechanism 4. The first control element is used to control the operation of the atomizing mechanism 4 and adjust the working mode of the atomizing mechanism 4. In the first mode, the atomizing mechanism 4 intermittently atomizes the electrolyte; in the second mode, the atomizing mechanism 4 continuously atomizes the electrolyte.

[0053] In this embodiment, by providing a first control element, the atomizing mechanism 4 can be controlled. When atomization of the electrolyte is required, the first control element controls the atomizing mechanism 4 to open; when atomization is not required, the first control element controls the atomizing mechanism 4 to close. This improves the operability of the injection device and saves energy. Simultaneously, the first control element can switch the atomizing mechanism 4 between two operating modes, allowing operators to choose according to actual needs and improving the flexibility of the injection device.

[0054] In specific applications, the first control component includes any one of the following: microcontroller, single-chip microcomputer, programmable logic device, etc. Those skilled in the art can set it according to actual needs, and this application does not limit it.

[0055] It should be explained that the first control unit can adjust the working mode of the atomizing mechanism 4. The atomizing mechanism 4 has at least two working modes: one is to atomize the electrolyte intermittently, and the other is to atomize the electrolyte continuously. This allows for selection based on different liquid injection conditions, improving the flexibility of the liquid injection device.

[0056] It should be noted that the first control element adjusts the working mode of the atomizing mechanism 4. Specifically, when the atomizing mechanism 4 is a piezoelectric ceramic, its vibration frequency is adjusted; when the atomizing mechanism 4 is an ultrasonic atomizer, the frequency of the ultrasonic waves is adjusted, etc. The specific settings can be based on the structure of the atomizing mechanism 4.

[0057] like Figure 3 As shown, in some embodiments of this application, the atomizing mechanism 4 includes a body 41 and an atomizing element 42. One end of the body 41 is connected to the liquid storage cup 2, and the other end of the body 41 is connected to the liquid injection element 3. The body 41 is provided with a connecting cavity 411, which connects the liquid storage cup 2 and the liquid injection element 3. The atomizing element 42 is disposed in the connecting cavity 411 and is used to atomize the electrolyte flowing through the connecting cavity 411.

[0058] In this embodiment, the atomizing mechanism 4 has a connecting cavity 411 in its body 41, so that the liquid storage cup 2, the connecting cavity 411, the liquid injection channel 31 and the spray hole 32 form a flow path for the electrolyte. Then, the electrolyte can be atomized by the atomizing element 42 when it flows through the connecting cavity 411, thereby improving the atomization efficiency.

[0059] In specific applications, the atomizing element 42 may include any one of a piezoelectric atomizer, an ultrasonic atomizer, and a thermal atomizer. Those skilled in the art can configure it according to actual needs, and this application does not impose any restrictions on it.

[0060] For example, the atomizing element 42 is a piezoelectric atomizer, the core component of which is a piezoelectric ceramic. The electrolyte is pulverized into tiny droplets, such as droplets with a particle size of less than 50 μm, by high-frequency oscillation of the piezoelectric ceramic. This achieves atomization. After the atomized electrolyte enters the battery cell 1, it can penetrate into the gaps of the electrode assembly 11, improving the wetting effect of the electrolyte and reducing defects such as electrode polarization and low cycle life.

[0061] In some embodiments of this application, the atomizing element 42 includes any one of a piezoelectric atomizer, an ultrasonic atomizer, and a thermal atomizer.

[0062] In this embodiment, by setting the atomizing element 42 to any one of a piezoelectric atomizer, an ultrasonic atomizer, and a thermal atomizer, flexible selection can be made, thereby reducing the cost of the liquid injection device while ensuring the liquid injection efficiency.

[0063] In specific applications, piezoelectric atomizers specifically refer to those that utilize the inverse piezoelectric effect to generate mechanical vibrations at high-frequency voltages (such as 20kHz to 2MHz), causing the electrolyte to break into micron-sized droplets (such as 1 to 50μm), for example, piezoelectric ceramic sheets; ultrasonic atomizers specifically refer to those that generate ultrasonic waves (frequency ≥1MHz) through piezoelectric transducers or magnetostrictive elements, forming capillary waves (Faraday waves) on the liquid surface, which then break into atomized droplets; thermal bubble atomizers specifically refer to those that use micro-heaters (such as resistance wires / MEMS heating films) to instantly vaporize the liquid, forming bubbles that burst and eject droplets.

[0064] It should be noted that other atomizing components 42 that can atomize the electrolyte can also be selected. For example, a high-pressure pump can be used in conjunction with the nozzle 32 to increase the pressure of the electrolyte, so that it can be sprayed out through the nozzle 32 to form tiny droplets.

[0065] like Figure 1 As shown, in some embodiments of this application, the liquid injection device further includes a support assembly 5 and a heating element. The support assembly 5 is provided with a receiving cavity 51 for placing the battery cell 1. The heating element is disposed on at least one side wall of the receiving cavity 51 and is used to heat the battery cell 1.

[0066] In this embodiment, by providing a heating element on at least one side wall of the receiving cavity 51 of the support component 5, the viscosity of the electrolyte can be reduced by heating the battery cell 1 during electrolyte injection, thereby enhancing the capillary permeability of the electrolyte. At the same time, heating the battery cell 1 can also promote the pre-reaction of the electrolyte with the electrode component 11, thereby generating a more uniform SEI / CEI film and reducing local wetting at the four corners. In addition, heating can reduce the dissolved gas in the electrolyte and reduce the occurrence of void gas resistance.

[0067] In specific applications, the heating element can be any type of heating element such as heating wire or heating film. Those skilled in the art can configure it according to actual needs, and this application does not impose any restrictions on it.

[0068] It should be noted that the heating element is disposed on at least one side wall of the receiving cavity 51. Specifically, it can be disposed on any one side wall, or on any two side walls, or on any three side walls. Similarly, it can be disposed on all side walls. Those skilled in the art can make the configuration according to actual needs, and this application does not impose any restrictions on this.

[0069] In some embodiments of this application, the liquid injection device further includes a second control element, which is electrically connected to the heating element and is used to control the start and stop of the heating element to heat the battery cell 1.

[0070] In this embodiment of the application, by setting a second control element, the start and stop of the heating element can be controlled as needed to heat the battery cell 1, thereby improving the operability of the liquid injection device and increasing the heating efficiency.

[0071] It should be noted that the second control device includes any one of the following: microcontroller, single-chip microcomputer, programmable logic device, etc. Those skilled in the art can set it according to actual needs, and this application does not limit it.

[0072] Optionally, the liquid injection device further includes a detection element disposed on the side wall of the receiving cavity 51. The detection element is electrically connected to a second control element, and is used to detect the temperature of the battery cell 1. The second control element is configured to adjust the power of the heating element according to the detected temperature. This can save energy and improve heating efficiency.

[0073] In specific applications, the detection device includes any one of the following: thermistor, thermocouple, infrared temperature sensor, fiber optic temperature sensor, etc. Those skilled in the art can choose according to actual needs, and this application does not impose any restrictions on this.

[0074] like Figure 1 , Figure 5 and Figure 6 As shown, in some embodiments of this application, the liquid injection device further includes an air passage unit 6. At least one side wall of the receiving cavity 51 is provided with a telescopic member 7, and an air cavity 71 is formed inside the telescopic member 7. The air passage unit 6 is connected to the liquid storage cup 2 and the air cavity 71 respectively. The air passage unit 6 is used to provide air pressure to the liquid storage cup 2 and the air cavity 71. The telescopic member 7 can expand or contract with the air pressure to squeeze and support the battery cell 1. The heating element is provided inside the air cavity 71.

[0075] In this embodiment, by simultaneously pressurizing the liquid storage cup 2 and the retractable member 7 through the air circuit unit 6, the pressure on the inner and outer sides of the battery cell 1 can be relatively balanced, thereby increasing the pressure during pressurization, which in turn improves the speed and quality of liquid injection and increases production efficiency; it can also reduce the rigid extrusion that the battery cell 1 experiences during micro-deformation; and by placing the heating element in the air chamber 71, the battery cell 1 can be heated simultaneously while being extruded; this reduces the operation of the liquid injection device and improves the liquid injection efficiency.

[0076] In specific applications, the sidewall of the receiving cavity 51 is provided with a telescopic member 7, which can be on the sidewall in the length direction of the support component 5 or on the sidewall in the width direction of the support component 5. That is, the telescopic member 7 can be provided on at least one sidewall of the receiving cavity 51. For example, the telescopic member 7 can be provided on one sidewall, two sidewalls, three sidewalls, or four sidewalls. Those skilled in the art can make the settings according to actual needs, and this application does not limit them.

[0077] Understandably, an air cavity 71 is formed inside the telescopic member 7. The air passage unit 6 can provide air pressure to the air cavity 71 of the telescopic member 7, thereby causing the telescopic member 7 to expand or contract and deform with changes in air pressure. Specifically, the telescopic member 7 can be an airbag with an air cavity. By injecting gas into the air cavity, it expands and deforms to compress the outer periphery of the battery cell 1, thus preventing the battery cell 1 from deforming when pressurized internally. The material of the telescopic member 7 can include at least one of the following: rubber, nylon, polyamide, polyester, polyurethane, composite materials, etc. Those skilled in the art can set it according to actual needs, and this application does not limit it.

[0078] It should be explained that the heating element is located inside the gas cavity 71. In actual use, the heating element does not contact the cavity wall of the gas cavity 71. The gas inside the gas cavity 71 is heated, thereby the heated gas can heat the battery cell 1.

[0079] Understandably, the gas path unit 6 is a mechanism in the liquid injection device that provides positive or negative pressure to the battery cell 1. For example, the gas path unit 6 includes a positive pressure gas tank, a negative pressure gas tank, a slip ring, and pipelines. The positive and negative pressure gas tanks are respectively connected to the slip ring, which is connected to the liquid storage cup 2 and the retractable component 7 via pipelines to provide positive or negative pressure to the liquid storage cup 2 and the retractable component 7. During the liquid injection process of the battery cell 1, there are typically two processes: vacuuming and pressurizing. The gas path unit 6 evacuates the battery cell 1 to remove air from inside, facilitating the injection of electrolyte into the battery cell 1. The gas path unit 6 pressurizes the battery cell 1 to ensure that the electrolyte is fully injected under high pressure, allowing the electrolyte to fully wet the electrode assembly 11 and distribute evenly.

[0080] Based on this, the retractable component 7 and the liquid storage cup 2 are both connected to the gas circuit unit 6. The gas circuit unit 6 can simultaneously pressurize the inside and outside of the battery cell 1 through the liquid storage cup 2 and the retractable component 7, thereby keeping the internal and external pressures of the battery cell 1 balanced, which can further increase the pressure when the battery cell 1 is pressurized. When pressurized, the increased internal pressure of the battery cell 1 can increase the wetting speed of the electrolyte, thereby improving the liquid injection efficiency, shortening the production time, and improving the production efficiency of the liquid injection device.

[0081] like Figure 1 As shown, in some embodiments of this application, the gas circuit unit 6 includes a gas source 61, a first pipeline 62 and a second pipeline 63. One end of the first pipeline 62 is connected to the gas source 61 and the other end of the first pipeline 62 is connected to the liquid storage cup 2. One end of the second pipeline 63 is connected to the gas source 61 and the other end of the second pipeline 63 is connected to the air chamber 71.

[0082] In this embodiment, the gas source 61 is connected to the liquid storage cup 2 and the air cavity 71 of the expandable member 7 via the first pipe 62 and the second pipe 63, respectively. When the gas source 61 applies positive or negative pressure to the liquid storage cup 2, the expandable member 7 can expand or contract synchronously, thereby keeping the internal and external pressures of the battery cell 1 balanced. This further increases the pressure when the battery cell 1 is pressurized. When pressurized, the increased internal pressure of the battery cell 1 can increase the wetting speed of the electrolyte, thereby improving the injection efficiency, shortening the production time, and improving the production efficiency of the injection device.

[0083] In specific applications, the first pipe 62 and the second pipe 63 are also equipped with a switch, which is used to control the on / off state of the first pipe 62 and the second pipe 63, so that they can be opened or closed as needed.

[0084] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0085] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A liquid injection device for injecting liquid into a battery cell (1), characterized in that, include: A liquid storage cup (2) is used to supply electrolyte; Liquid injection component (3), said liquid injection component (3) is adapted to be at least partially inserted into said battery cell (1); Atomizing mechanism (4) is provided between the liquid storage cup (2) and the liquid injection component (3). The atomizing mechanism (4) is used to atomize the flowing electrolyte so that the atomized electrolyte is injected into the battery cell (1) through the liquid injection component (3).

2. The liquid injection device according to claim 1, characterized in that, The liquid injection component (3) is provided with a liquid injection channel (31). The end of the liquid injection component (3) away from the liquid storage cup (2) is provided with a spray hole (32). The end of the liquid injection component (3) with the spray hole (32) is suitable for insertion into the battery cell (1). One end of the liquid injection channel (31) is connected to the atomizing mechanism (4), and the other end of the liquid injection channel (31) is connected to the spray hole (32). The spray hole (32) is used to spray the atomized electrolyte into the battery cell (1).

3. The liquid injection device according to claim 2, characterized in that, The liquid injection component (3) has a ball head (33) at one end away from the liquid storage cup (2), and the ball head (33) has a plurality of spray holes (32) arranged at intervals.

4. The liquid injection device according to claim 1, characterized in that, The liquid injection device further includes a first control component, which is electrically connected to the atomizing mechanism (4). The first control component is used to control the operation of the atomizing mechanism (4) and adjust the working mode of the atomizing mechanism (4). In the first mode, the atomizing mechanism (4) intermittently atomizes the electrolyte; in the second mode, the atomizing mechanism (4) continuously atomizes the electrolyte.

5. The liquid injection device according to any one of claims 1-4, characterized in that, The atomizing mechanism (4) includes a body (41) and an atomizing element (42). One end of the body (41) is connected to the liquid storage cup (2), and the other end of the body (41) is connected to the liquid injection element (3). The body (41) is provided with a connecting cavity (411), which connects the liquid storage cup (2) and the liquid injection element (3). The atomizing element (42) is located in the connecting cavity (411) and is used to atomize the electrolyte flowing through the connecting cavity (411).

6. The liquid injection device according to claim 5, characterized in that, The atomizing element (42) includes any one of a piezoelectric atomizer, an ultrasonic atomizer, and a thermal atomizer.

7. The liquid injection device according to any one of claims 1-4, characterized in that, The liquid injection device further includes a support assembly (5) and a heating element. The support assembly (5) has a receiving cavity (51) for placing the battery cell (1). The heating element is disposed on at least one side wall of the receiving cavity (51) for heating the battery cell (1).

8. The liquid injection device according to claim 7, characterized in that, The liquid injection device further includes a second control component, which is electrically connected to the heating component. The second control component is used to control the start and stop of the heating component to heat the battery cell (1).

9. The liquid injection device according to claim 7, characterized in that, The liquid injection device further includes a gas path unit (6). At least one side wall of the receiving cavity (51) is provided with a telescopic member (7). An air cavity (71) is formed in the telescopic member (7). The gas path unit (6) is connected to the liquid storage cup (2) and the air cavity (71) respectively. The gas path unit (6) is used to provide air pressure to the liquid storage cup (2) and the air cavity (71). The telescopic member (7) can expand or contract with the air pressure to squeeze and support the battery cell (1). The heating element is located in the air cavity (71).

10. The liquid injection device according to claim 9, characterized in that, The gas circuit unit (6) includes a gas source (61), a first pipeline (62) and a second pipeline (63). One end of the first pipeline (62) is connected to the gas source (61), and the other end of the first pipeline (62) is connected to the liquid storage cup (2). One end of the second pipeline (63) is connected to the gas source (61), and the other end of the second pipeline (63) is connected to the air chamber (71).

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