Battery filling system and battery filling method

Abstract

The embodiment of the present application discloses a battery liquid filling system and a battery liquid filling method. The battery liquid filling system includes a frame, a liquid preparation device and a liquid filling device. The liquid filling device includes a shell, a liquid filling assembly and a positive and negative pressure switching interface. The shell has a accommodating chamber. The liquid filling assembly and the positive and negative pressure switching interface are both arranged on the shell and are not connected to each other. The positive and negative pressure switching interface is used to evacuate the accommodating chamber in a sealed state and the battery cell located in the accommodating chamber, or to introduce gas into the accommodating chamber in a vacuum state. The liquid filling assembly is used to inject liquid into the battery cell. The liquid preparation device includes a moving mechanism and a liquid separation valve. The moving mechanism is used to drive the liquid separation valve to move so that the liquid separation port and the liquid inlet of the liquid preparation assembly can be detachably docked. In the battery liquid filling system of the embodiment of the present application, when the accommodating chamber is evacuated through the positive and negative pressure switching interface, the electrolyte in the liquid filling assembly will not enter the positive and negative pressure switching interface, thereby reducing the probability of electrolyte crystallization and increasing the smoothness of vacuuming.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery filling system and a battery filling method. Background Art

[0002] New energy batteries are increasingly used in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are increasingly used in energy storage, etc. During the production process of batteries, liquid electrolytes need to be injected into the battery to form ion channels so that enough lithium ions can migrate between the positive and negative electrodes during the charge and discharge process to achieve reversible circulation.

[0003] In the related technology, the liquid injection equipment includes a negative pressure module, a preparation liquid cup and a liquid injection module. The liquid injection module has a liquid injection nozzle. The negative pressure module is connected to the liquid injection nozzle. When the liquid injection nozzle is connected to the liquid injection port of the battery cell, the battery cell is vacuumed. After the battery cell is vacuumed, electrolyte is injected into the preparation liquid cup for preparation. Then, the liquid injection module injects the electrolyte in the preparation liquid cup into the battery cell through the liquid injection nozzle to complete the liquid injection of the battery.

[0004] However, there are common parts in the negative pressure passage between the negative pressure module and the battery cell and the injection passage between the injection module and the battery cell. On the one hand, the vacuuming step must be completed before the liquid preparation can begin, and the vacuuming and liquid preparation cannot be carried out at the same time, which affects the injection efficiency; on the other hand, the electrolyte remaining during the injection is easily sucked into the negative pressure passage during the next vacuuming, which can easily form electrolyte crystals, causing blockage of the negative pressure passage and the injection passage, thereby reducing the injection efficiency. Summary of the invention

[0005] In order to solve the above-mentioned technical problems, the present application provides a battery filling system and a battery filling method, in which the filling component and the positive and negative pressure switching interface are not connected to each other. When the accommodating cavity is evacuated through the positive and negative pressure switching interface, the electrolyte in the filling component will not enter the positive and negative pressure switching interface, and the probability of electrolyte crystallization is reduced, thereby increasing the filling efficiency.

[0006] This application is implemented through the following technical solutions.

[0007] The first aspect of the present application provides a battery filling system, comprising:

[0008] frame;

[0009] A liquid preparation device connected to the frame, the liquid preparation device comprising a liquid preparation component, the liquid preparation component is used to store the liquid to be injected, and the liquid preparation component has a liquid outlet;

[0010] A liquid injection device is connected to the frame, and the liquid injection device includes a shell, a liquid injection assembly and a positive and negative pressure switching interface. The shell has a accommodating cavity for accommodating a battery cell. The liquid injection assembly and the positive and negative pressure switching interface are both arranged in the shell and are not connected to each other. The positive and negative pressure switching interface is used to evacuate the accommodating cavity in a sealed state, or to introduce gas into the accommodating cavity in a vacuum state. The liquid outlet of the reserve liquid assembly is connected to the liquid injection assembly, and the liquid injection assembly is used to inject liquid into the battery cell accommodated in the accommodating cavity.

[0011] In the technical solution of the embodiment of the present application, the liquid injection component is not connected to the positive and negative pressure switching interface. When the accommodating chamber is evacuated through the positive and negative pressure switching interface, the electrolyte in the liquid injection component will not enter the positive and negative pressure switching interface, reducing the probability of electrolyte crystallization, thereby reducing the probability of blockage of the positive and negative pressure switching interface, increasing the smoothness of vacuuming, and thus increasing the efficiency of liquid injection. The positive and negative pressure switching interface can also pass gas when injecting liquid into the battery cell to make the internal and external pressures of the battery cell the same, reducing the probability of swelling of the battery cell and increasing the stability of liquid injection of the battery cell. In addition, the positive and negative pressure switching interface is not connected to the liquid reserve component, that is, when the accommodating chamber is evacuated, the liquid reserve component can also operate independently, so as to facilitate the simultaneous implementation of the vacuuming step and the liquid reserve step, fully improve the liquid injection efficiency of the battery cell, and improve the battery production capacity. In addition, by integrating the liquid reserve device and the liquid injection device together through the rack, it is also possible to reduce the equipment footprint, simplify the layout, and make the structure of the battery injection system simpler and more reasonable.

[0012] In some embodiments, the injection assembly includes a valve and an injection nozzle, the valve connecting the liquid outlet and the injection nozzle, the injection nozzle being used to detachably dock with the injection port of the battery cell, and the valve being used to open or close the channel between the injection nozzle and the liquid outlet.

[0013] In the technical solution of the embodiment of the present application, the valve and the injection nozzle are set. When the battery cell is vacuumed, the valve is closed and the injection nozzle is separated from the battery cell to reduce the probability of electrolyte leakage in the non-injection state. When the battery cell is injected, the injection nozzle is docked with the injection port of the battery cell so that the electrolyte is directly and accurately injected into the battery cell. When the injection process is completed or no more injection is required, the valve is closed to achieve precise control of the injection. The injection nozzle and the injection port of the battery cell are detachable. The injection nozzle and the battery cell can be easily docked or separated from the battery cell for the next injection operation or cleaning and maintenance.

[0014] In some embodiments, the injection device includes a first lifting mechanism, which is used to drive the battery cell to move toward or away from the injection assembly so that the injection port of the battery cell can be docked or separated from the injection nozzle of the injection assembly.

[0015] In the technical solution of the embodiment of the present application, the first lifting mechanism is used to drive the filling port of the battery cell to dock or separate with the filling nozzle of the filling assembly, so that the position of the battery cell can be accurately controlled, the docking accuracy of the filling nozzle and the filling port can be increased, and the position of the battery cell can be adjusted without changing the position of the filling nozzle, which can also facilitate the removal of the battery cell that has been filled, thereby increasing the reliability of filling.

[0016] In some embodiments, the shell includes a shell cover and a base that are separately arranged, the shell cover and the base are detachably connected along a first direction to jointly define the accommodating cavity, and the injection assembly and the positive and negative pressure switching interface are arranged on the top side of the shell cover;

[0017] The liquid injection device includes a second lifting mechanism, which is connected to the base and is used to drive the base to move along the first direction to dock with or separate from the shell cover.

[0018] In the technical solution of the embodiment of the present application, through the accurate control of the second lifting mechanism, the shell cover and the base can be reliably docked and separated, thereby facilitating the vacuuming and injection of the battery cells and the removal of the battery cells that have been injected. The separately arranged shell cover and base can also facilitate the maintenance and cleaning of the accommodating cavity.

[0019] In some embodiments, the shell includes a locking mechanism, which is disposed on the base or the top cover. The locking mechanism is used to lock the shell cover and the base when the base moves to dock with the shell cover, so that the accommodating cavity is in a sealed state.

[0020] In the technical solution of the embodiment of the present application, the setting of the locking mechanism can make the structure of the shell more stable, can further increase the sealing state of the accommodating chamber during the vacuuming process and the liquid injection process, reduce the probability of external air and impurities entering the accommodating chamber, and increase the reliability of the vacuuming process and the liquid injection process. At the same time, during the vacuuming process and the liquid injection process, the locking mechanism locks the shell cover and the base, which can reduce the probability of damage to the seal due to impact.

[0021] In some embodiments, the first lifting mechanism includes a driving rod and a top plate, the top plate is arranged in the accommodating cavity, the top plate is used to support the battery cell, one end of the driving rod is located in the accommodating cavity and connected to the top plate, and the other end of the driving rod is located on the bottom side of the outside of the base, and the top plate is used to drive the battery cell to move along the first direction under the driving action of the driving rod, so that the injection port of the battery cell can be docked or separated from the injection nozzle of the injection assembly.

[0022] In the technical solution of the embodiment of the present application, the driving rod and the top plate cooperate, and the top plate plays a supporting role for the battery cell. Under the drive of the driving rod, the stability and safety of the battery cell during movement can be further increased. In addition, the position of the battery cell can also be positioned through the top plate so that the injection port of the battery cell can be accurately docked with the injection nozzle. At the same time, the cooperation of the top plate and the driving rod can also adapt to battery cells of different sizes and shapes, and meet the diverse battery injection needs.

[0023] In some embodiments, the cross-sectional shape of the shell along a first direction perpendicular to the first direction is rectangular, wherein the first direction is parallel to the top and bottom directions of the battery filling system.

[0024] In the technical solution of the embodiment of the present application, the cross-sectional shape design of the shell can ensure that the shell has sufficient space to accommodate the battery cells, so that the battery cells can be closely arranged in the shell. At the same time, the rectangular shape can also make the shell stable and easy to maintain.

[0025] In some embodiments, the liquid preparation assembly includes a liquid preparation cup and a positive pressure liquid injection interface, the liquid preparation cup having a liquid inlet, a liquid storage space and the liquid outlet, the liquid inlet is used to introduce the liquid to be injected into the liquid storage space, the positive pressure liquid injection interface is not connected to the liquid inlet and is connected to the liquid storage space, and the positive pressure liquid injection interface is used to introduce gas to transport the liquid to be injected in the liquid storage space to the battery cell through the liquid outlet and the liquid injection assembly.

[0026] In the technical solution of the embodiment of the present application, the liquid to be injected enters the liquid storage space from the liquid inlet to complete the liquid preparation. The positive and negative pressure switching interface can simultaneously evacuate the accommodating chamber and the battery cell located in the accommodating chamber. After the vacuum is evacuated, the positive pressure injection interface injects gas into the liquid storage space. Under the action of the gas, the liquid to be injected flows through the liquid outlet to the injection assembly and then to the battery cell to complete the injection of the battery cell. The positive pressure injection method can control the delivery rate of the liquid to be injected. At the same time, the positive and negative pressure switching interface also cooperates to introduce gas into the accommodating chamber, so that the internal and external pressures of the battery cell are equal, thereby increasing the injection stability of the battery cell.

[0027] In some embodiments, the liquid preparation component includes a blocking member, and the blocking member can open or block the liquid inlet.

[0028] In the technical solution of the embodiment of the present application, when preparing the liquid, the sealing member opens the liquid inlet so that the liquid to be injected can enter the liquid storage space from the liquid inlet. When the liquid preparation is completed, the sealing member closes the liquid inlet to reduce the probability of impurities entering the liquid storage space. At the same time, it is convenient to introduce gas into the liquid storage space from the positive pressure injection interface, so that the liquid to be injected flows from the liquid storage space to the injection assembly to inject the battery cell.

[0029] In some embodiments, the liquid preparation component further includes a negative pressure liquid injection interface, which is not connected to the liquid inlet but is connected to the liquid storage space, and is used to evacuate the liquid storage space.

[0030] In the technical solution of the embodiment of the present application, through the cooperation of the negative pressure injection interface and the positive pressure injection interface, when the smoothness of the positive pressure injection is reduced, the flow of the liquid to be injected is regulated by negative pressure suction, making the positive pressure injection smoother, thereby increasing the injection efficiency of the battery cell.

[0031] In some embodiments, the positive pressure injection interface is connected to the liquid storage space through a first channel, and the negative pressure injection interface is connected to the liquid storage space through a second channel, and at least part of the first channel and the second channel overlap.

[0032] In the technical solution of the embodiment of the present application, at least part of the first channel and the second channel overlap, which can reduce the need for additional pipelines, making the structure of the entire liquid preparation component more compact and occupying less space, and achieving liquid injection through the alternating operation of the positive pressure liquid injection interface and the negative pressure liquid injection interface.

[0033] In some embodiments, the liquid preparation device includes a moving mechanism and a liquid separation valve, the liquid separation valve has a liquid separation port, the liquid separation valve is arranged on the top side of the liquid preparation component, and the moving mechanism is used to drive the liquid separation valve to move so that the liquid separation port and the liquid inlet of the liquid preparation component can be detachably docked.

[0034] In the technical solution of the embodiment of the present application, the flow control of the liquid separating valve can be used to accurately adjust the amount of liquid to be injected allocated to each battery cell, thereby increasing the consistency of the battery. The combination of the moving mechanism and the liquid separating valve can realize the automation of the liquid distribution to be injected, thereby improving the efficiency and accuracy of liquid preparation.

[0035] In some embodiments, the liquid preparation component includes a plurality of liquid preparation cups spaced apart along the second direction, the number of the liquid preparation components is multiple, and the multiple liquid preparation components are fixed on the rack and arranged side by side along the third direction;

[0036] The moving mechanism includes a first transfer module, a second transfer module and a third transfer module, the liquid separation valve is connected to the first transfer module, and the first transfer module is used to drive the liquid separation valve to move along a first direction;

[0037] The second transfer module extends along the second direction, the first transfer module is arranged on the second transfer module, and the second transfer module is used to drive the first transfer module to move along the second direction;

[0038] The third transfer module is connected to the frame and extends along the third direction, the second transfer module is arranged on the third transfer module, and the third transfer module is used to drive the second transfer module to move along the third direction;

[0039] The first direction, the second direction, and the third direction are perpendicular to each other.

[0040] In the technical solution of the embodiment of the present application, the mobile mechanism can quickly and accurately switch between multiple reserve liquid cups through movement in three-dimensional space, and adapt to the reserve liquid requirements of reserve liquid cups in different positions, thereby improving the injection efficiency. The battery injection system can prepare liquid for multiple reserve liquid components, thereby facilitating the simultaneous injection of battery cells arranged in a two-dimensional array structure, thereby increasing the injection efficiency.

[0041] A second aspect of an embodiment of the present application provides a battery liquid filling method, the battery liquid filling method comprising:

[0042] Liquid preparation step: injecting the liquid to be injected into the liquid storage space of the liquid preparation component;

[0043] Vacuuming step: sealing the accommodating cavity, and in a state where the liquid injection port of the battery cell and the liquid injection assembly are separated, controlling the positive and negative pressure switching interface to evacuate the accommodating cavity, wherein the battery cell is accommodated in the accommodating cavity;

[0044] Liquid injection step: controlling the battery cell to move so that the liquid injection port of the battery cell docks with the liquid injection assembly, and injecting the liquid to be injected in the reserve liquid assembly into the battery cell through the liquid injection assembly, and controlling the positive and negative pressure switching interface to pass gas into the accommodating cavity during the liquid injection process;

[0045] Wherein, the positive and negative pressure switching interface is not connected to the liquid injection component.

[0046] In the technical solution of the embodiment of the present application, the liquid preparation step and the vacuum pumping step do not interfere with each other, the liquid injection path and the vacuum pumping path are separated, the probability of electrolyte crystallization is low, and during the liquid injection process, the positive and negative pressure switching interface can assist in balancing the internal and external pressures of the battery cell, thereby improving the liquid injection efficiency and liquid injection reliability of the battery cell.

[0047] In some embodiments, the step of injecting the liquid to be injected in the liquid preparation assembly into the battery cell via the liquid injection assembly comprises:

[0048] Positive pressure injection: Control the positive pressure injection interface of the liquid reserve component to pass gas into the liquid storage space of the liquid reserve component, so as to inject all the liquid to be injected in the required amount of the battery cell into the battery cell.

[0049] In the technical solution of the embodiment of the present application, the positive pressure injection method is adopted, which can further improve the injection efficiency and shorten the time required to fill the battery cell with liquid.

[0050] In some embodiments, the step of injecting the liquid to be injected in the liquid preparation assembly into the battery cell via the liquid injection assembly comprises alternately performing positive pressure injection and negative pressure suction, wherein:

[0051] Positive pressure injection: closing the negative pressure injection interface of the liquid preparation component, and controlling the positive pressure injection interface of the liquid preparation component to inject gas into the liquid storage space of the liquid preparation component;

[0052] Negative pressure suction: close the positive pressure injection interface of the liquid preparation component, and control the negative pressure injection interface of the liquid preparation component to vacuum the liquid storage space of the liquid preparation component.

[0053] In the technical solution of the embodiment of the present application, the flow of the electrolyte can be adjusted in time by combining positive pressure injection and negative pressure suction, thereby making the positive pressure injection smoother and increasing the injection efficiency of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0055] Figure 1 This is a schematic structural diagram of a battery liquid filling system according to an embodiment of the present application;

[0056] Figure 2 This is a schematic structural diagram of a liquid preparation device according to an embodiment of the present application;

[0057] Figure 3 for Figure 2 A partial structural schematic diagram of the liquid preparation component shown;

[0058] Figure 4 for Figure 3 A schematic structural diagram of the liquid preparation component from another perspective;

[0059] Figure 5 for Figure 2 The structural schematic diagram of the liquid injection device shown, wherein the shell cover and the base are in a separated state;

[0060] Figure 6 A schematic diagram of a battery filling method according to an embodiment of the present application;

[0061] Figure 7 The figure is a flow chart of a battery filling method according to an application embodiment of the present application.

[0062] Description of Reference Numerals

[0063] 1-Battery filling system;

[0064] 10- rack;

[0065] 11-liquid preparation device; 111-liquid preparation assembly; 111a-liquid inlet; 111b-liquid outlet; 111c-liquid storage space; 111d-positive pressure liquid injection interface; 111e-negative pressure liquid injection interface; 111f-first channel; 111g-second channel; 1111-liquid preparation cup; 1112-blocking member; 112-liquid separation valve; 113-moving mechanism; 1131-first transfer module; 1132-second transfer module; 1133-third transfer module;

[0066] 12-liquid injection device; 121-shell; 121a-accommodating chamber; 1211-base; 1212-shell cover; 1213-locking mechanism; 122-liquid injection assembly; 1221-valve; 1222-liquid injection nozzle; 123-positive and negative pressure switching interface; 124-first lifting mechanism; 1241-driving rod; 1242-top plate; 125-second lifting mechanism;

[0067] 20-Battery cell. DETAILED DESCRIPTION

[0068] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0069] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusions.

[0070] In the description of the embodiments of the present application, the technical terms "first", "second", "third", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0071] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0072] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0073] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0074] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0075] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0076] Below, this application is described in detail.

[0077] At present, new energy batteries are increasingly used in life and industry. New energy batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0078] In the battery production process, injecting liquid electrolyte (referred to as injection) is a very critical step. Therefore, the injection amount of liquid electrolyte (referred to as electrolyte) and the injection conditions inside the battery cell need to meet specific conditions. In order to facilitate the smooth injection of electrolyte, before injection, the air inside the battery cell needs to be extracted (referred to as vacuum pumping) to make the inside of the battery cell a vacuum condition, so as to facilitate the smooth flow of electrolyte, and in order to facilitate the control of the injection amount of electrolyte, a suitable amount needs to be prepared before injection.

[0079] Based on this, the inventor of the present application noticed that in the existing liquid filling equipment, the liquid filling equipment includes a negative pressure module, a preparation liquid cup and a liquid filling module, the liquid filling module has a liquid filling nozzle, and the negative pressure module is connected to the liquid filling nozzle. When the liquid filling nozzle is connected to the liquid filling port of the battery cell, the battery cell is vacuumed. After the battery cell is vacuumed, electrolyte is injected into the preparation liquid cup for preparation. Then, the liquid filling module injects the electrolyte in the preparation liquid cup into the battery cell through the liquid filling nozzle to complete the liquid filling of the battery.

[0080] However, there are common parts in the negative pressure passage between the negative pressure module and the battery cell and the injection passage between the injection module and the battery cell. On the one hand, the vacuuming step must be completed before the liquid preparation can begin, and the vacuuming and liquid preparation cannot be carried out at the same time, which affects the injection efficiency; on the other hand, the electrolyte remaining during the injection is easily sucked into the negative pressure passage during the next vacuuming, which can easily form electrolyte crystals, causing blockage of the negative pressure passage and the injection passage, thereby reducing the injection efficiency.

[0081] Based on the above considerations, in order to reduce the probability of electrolyte crystallization and improve the efficiency of liquid injection, the first aspect of the present application provides a battery liquid injection system. The battery liquid injection system includes a frame, a liquid preparation device and a liquid injection device. The liquid preparation device is connected to the frame. The liquid preparation device includes a liquid preparation component. The liquid preparation component is used to store the liquid to be injected. The liquid preparation component has a liquid outlet; the liquid injection device is connected to the frame. The liquid injection device includes a shell, a liquid injection component and a positive and negative pressure switching interface. The shell has a accommodating cavity for accommodating battery cells. The liquid injection component and the positive and negative pressure switching interface are both arranged in the shell and are not connected to each other. The positive and negative pressure switching interface is used to evacuate the accommodating cavity in a sealed state and the battery cell located in the accommodating cavity, or to introduce gas into the accommodating cavity in a vacuum state. The liquid outlet of the liquid preparation component is connected to the liquid injection component. The liquid injection component is used to inject liquid into the battery cell accommodated in the accommodating cavity. In this way, the liquid injection assembly is not connected to the positive and negative pressure switching interface. When the accommodating chamber is evacuated through the positive and negative pressure switching interface, the electrolyte in the liquid injection assembly will not enter the positive and negative pressure switching interface, reducing the probability of electrolyte crystallization, thereby reducing the probability of blockage of the positive and negative pressure switching interface, increasing the smoothness of vacuuming, and thus increasing the efficiency of liquid injection. The positive and negative pressure switching interface can also introduce gas when injecting liquid into the battery cell to make the internal and external pressures of the battery cell the same, reducing the probability of swelling of the battery cell and increasing the stability of liquid injection of the battery cell. In addition, the positive and negative pressure switching interface is not connected to the liquid reserve assembly, that is, when the accommodating chamber is evacuated, the liquid reserve assembly can also operate independently, so as to facilitate the simultaneous implementation of the vacuuming step and the liquid reserve step, fully improve the liquid injection efficiency of the battery cell, and increase the battery production capacity. In addition, by integrating the liquid reserve device and the liquid injection device together through the rack, it is also possible to reduce the equipment footprint, simplify the layout, and make the structure of the battery injection system simpler and more reasonable.

[0082] It should be noted that the battery cell may be a secondary battery, which refers to a battery cell that can be continuously used by activating the active material by charging after the battery cell is discharged. The battery cell may be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., and the embodiments of the present application are not limited thereto.

[0083] The following is combined with Figures 1 to 5 The battery liquid filling system 1 of some embodiments of the present application is further described in detail.

[0084] See also Figures 1 to 5The battery liquid injection system 1 includes a frame 10, a liquid preparation device 11 and a liquid injection device 12. The liquid preparation device 11 is connected to the frame 10. The liquid preparation device 11 includes a liquid preparation component 111. The liquid preparation component 111 is used to store the liquid to be injected. The liquid preparation component 111 has a liquid outlet 111b; the liquid injection device 12 is connected to the frame 10. The liquid injection device 12 includes a shell 121, a liquid injection component 122 and a positive and negative pressure switching interface 123. The shell 121 has a receiving cavity 121a for accommodating a battery cell 20. The liquid injection component 122 and the positive and negative pressure switching interface 123 are both arranged in the shell 121 and are not connected to each other. The positive and negative pressure switching interface 123 is used to evacuate the sealed accommodating chamber 121a and the battery cell 20 located in the accommodating chamber 121a, or to introduce gas into the accommodating chamber 121a in a vacuum state. The liquid outlet 111b of the reserve liquid component 111 is connected to the liquid injection component 122, and the liquid injection component 122 is used to inject liquid into the battery cell 20 accommodated in the accommodating chamber 121a.

[0085] It is understandable that the frame 10 can be used as the main frame of the battery injection system 1, and is used to carry the liquid preparation device 11 and the injection device 12. The liquid preparation device 11 and the injection device 12 are connected to the frame 10, that is, the liquid preparation device 11 and the injection device 12 are integrated together through the frame 10, which reduces the equipment footprint and simplifies the layout. The liquid preparation device 11 and the injection device 12 can be connected through the liquid preparation component 111 and the injection component 122 to achieve overall docking without the need for additional logistics.

[0086] Exemplarily, the liquid injection component 122 may be directly connected to the liquid outlet 111 b of the liquid reserve component 111 , or may be connected to the liquid outlet 111 b of the liquid reserve component 111 through a hose.

[0087] Exemplarily, the liquid injection device 12 may be disposed on the bottom side of the liquid preparation device 11 .

[0088] For example, the frame 10 can be a structure composed of beams, columns, etc., which can bear vertical loads and resist horizontal effects, and is not easy to be bent or broken. For example, the beams and columns can be made of metal to improve structural strength and reliability.

[0089] The liquid preparation device 11 is used for preparing liquid. The liquid preparation component 111 is used for storing liquid to be injected, and the liquid to be injected can be a liquid electrolyte, that is, an electrolyte. The electrolyte stored in the liquid preparation component 111 can leave the liquid preparation component 111 through the liquid outlet 111b.

[0090] The liquid injection device 12 is used to inject liquid into the battery cell 20 and provide a required pressure environment.

[0091] The housing 121 is used to provide a housing cavity 121 a for the battery cell 20 and to provide a sealed space for vacuuming the battery cell 20 .

[0092] The liquid injection component 122 is connected to the reserve liquid component 111, that is, the electrolyte in the reserve liquid component 111 can be injected into the battery cell 20 to form an ion channel, so that the battery cell 20 has enough lithium ions to migrate between the positive and negative electrodes during the charge and discharge process to achieve reversible circulation.

[0093] The positive and negative pressure switching interface 123 can control the pressure environment in the accommodating cavity 121 a by evacuating or introducing gas, thereby changing the internal pressure of the battery cell 20 and assisting the liquid injection process.

[0094] It should be noted that the liquid injection assembly 122 and the positive and negative pressure switching interface 123 are not connected to each other, which means that the liquid injection assembly 122 and the positive and negative pressure switching interface 123 can be used as two independent parts and can be operated independently. The liquid injection assembly 122 is used for liquid injection, and the positive and negative pressure switching interface 123 is used to provide the required pressure environment for the battery cell 20. There is no crossover or common part between the liquid injection assembly 122 and the positive and negative pressure switching interface 123. The liquid injection assembly 122 and the positive and negative pressure switching interface 123 are respectively connected to the housing 121. When the positive and negative pressure switching interface 123 is working, the electrolyte in the liquid injection assembly 122 will not enter the positive and negative pressure switching interface 123. In this way, when the positive and negative pressure switching interface 123 evacuates the accommodating chamber 121a, the electrolyte will not enter the positive and negative pressure switching interface 123, so as to reduce the probability of electrolyte crystallization, so that the vacuuming step is carried out smoothly and is not easy to be blocked.

[0095] It is understandable that the liquid reserve component 111 and the positive and negative pressure switching interface 123 are not connected to each other, and the electrolyte flows between the liquid injection component 122 and the liquid reserve component 111, and flows to the battery cell 20 through the liquid injection component 122, and the electrolyte does not enter the positive and negative pressure switching interface 123. In this way, when the positive and negative pressure switching interface 123 evacuates the accommodating chamber 121a, the liquid reserve component 111 can also perform the liquid reserve operation, that is, the vacuuming step and the liquid reserve step can be performed synchronously or with time overlap. Of course, the vacuuming step and the liquid reserve step can also be performed first and the other one is performed later, which is not limited here.

[0096] Specifically, when the accommodating chamber 121a is in a sealed state, the positive and negative pressure switching interface 123 evacuates the accommodating chamber 121a and the battery cell 20 located in the accommodating chamber 121a. It can be understood that at this time, the injection assembly 122 is not connected to the injection port of the battery cell 20, the electrolyte does not flow into the battery cell 20, and the injection port of the battery cell 20 is connected to the accommodating chamber 121a. In this way, the positive and negative pressure switching interface 123 evacuates the accommodating chamber 121a to extract the air in the battery cell 20, so that the battery cell 20 is in a vacuum state. The vacuum state facilitates the injection of electrolyte; after the accommodating chamber 121a is in a vacuum state, the battery cell 20 can be injected. It can be understood that at this time, the injection component 122 is connected to the injection port of the battery cell 20, and the liquid to be injected stored in the reserve liquid component 111 is injected into the battery cell 20 through the liquid outlet 111b and the injection component 122. The positive and negative pressure switching interface 123 introduces gas into the accommodating chamber 121a to make the internal and external pressures of the battery cell 20 the same, thereby reducing the probability of swelling of the battery cell 20 and increasing the injection stability.

[0097] In the battery injection system 1 provided in the embodiment of the present application, the injection assembly 122 and the positive and negative pressure switching interface 123 are not connected to each other. When the accommodating chamber 121a is evacuated through the positive and negative pressure switching interface 123, the electrolyte in the injection assembly 122 will not enter the positive and negative pressure switching interface 123, reducing the probability of electrolyte crystallization, thereby reducing the probability of blockage of the positive and negative pressure switching interface 123, increasing the smoothness of vacuuming, and thus increasing the injection efficiency. The positive and negative pressure switching interface 123 can also pass gas when injecting liquid into the battery cell 20 to make the internal and external pressures of the battery cell 20 the same, reducing the probability of swelling of the battery cell 20, and increasing the injection stability of the battery cell 20. In addition, the positive and negative pressure switching interface 123 and the reserve liquid assembly 111 are not connected to each other, that is, when the accommodating chamber 121a is evacuated, the reserve liquid assembly 111 can also operate independently, so as to facilitate the simultaneous implementation of the vacuuming step and the reserve liquid step, fully improving the injection efficiency of the battery cell 20, and improving the battery production capacity. In addition, by integrating the liquid preparation device 11 and the liquid injection device 12 together through the frame 10, the equipment footprint can be reduced, the layout can be simplified, and the structure of the battery liquid injection system 1 can be simpler and more reasonable.

[0098] For some examples, see Figure 2 The liquid preparation device 11 includes a moving mechanism 113 and a liquid separation valve 112. The liquid separation valve 112 has a liquid separation port. The liquid separation valve 112 is arranged on the top side of the liquid preparation component 111. The moving mechanism 113 is used to drive the liquid separation valve 112 to move so that the liquid separation port can be detachably connected to the liquid inlet 111a of the liquid preparation component 111.

[0099] Specifically, the liquid separation valve 112 is used to dock with the liquid inlet 111a of the liquid preparation component 111 through the liquid separation port to achieve the transmission of the liquid to be injected. The moving mechanism 113 is used to drive the liquid separation valve 112 to move to achieve the docking and separation of the liquid separation port and the liquid inlet 111a.

[0100] In this embodiment, through the flow control of the liquid separation valve 112, the amount of liquid to be injected allocated to each battery cell 20 can be accurately adjusted to increase the consistency of the battery. The combination of the moving mechanism 113 and the liquid separation valve 112 can realize the automation of the liquid allocation to be injected and improve the liquid preparation efficiency and accuracy.

[0101] The specific structure of the liquid injection component 122 is not limited.

[0102] For some examples, see Figure 5 The injection assembly 122 includes a valve 1221 and an injection nozzle 1222. The valve 1221 connects the liquid outlet 111b and the injection nozzle 1222. The injection nozzle 1222 is used to detachably dock with the injection port of the battery cell 20. The valve 1221 is used to open or close the channel between the injection nozzle 1222 and the liquid outlet 111b.

[0103] It is understandable that when the positive and negative pressure switching interface 123 evacuates the accommodating chamber 121a in a sealed state, the injection nozzle 1222 is separated from the injection port of the battery cell 20, so that the positive and negative pressure switching interface 123 can evacuate the air in the battery cell 20 through the injection port of the battery cell 20, so that the inside of the battery cell 20 is in a vacuum state. When injecting liquid into the battery cell 20, the injection nozzle 1222 is docked with the injection port of the battery cell 20 to inject the electrolyte in the liquid reserve assembly 111 into the battery cell 20 through the injection nozzle 1222.

[0104] It can be understood that when the battery cell 20 is injected with liquid, the positive and negative pressure switching interface 123 introduces air into the accommodating cavity 121a, and the injection nozzle 1222 and the injection port of the battery cell 20 are in a sealed docking state. In this way, the air introduced into the accommodating cavity 121a by the positive and negative pressure switching interface 123 will not enter the battery cell 20, thereby increasing the reliability of injection.

[0105] The valve 1221 is used to connect the liquid outlet 111b and the liquid injection nozzle 1222, and to open or close the passage between the liquid injection nozzle 1222 and the liquid outlet 111b, so as to achieve the connection or disconnection between the liquid injection nozzle 1222 and the liquid outlet 111b.

[0106] Specifically, when it is necessary to evacuate the battery cell 20, the injection nozzle 1222 is separated from the injection port of the battery cell 20, and the valve 1221 closes the channel between the injection nozzle 1222 and the liquid outlet 111b, so that the electrolyte cannot flow out through the injection nozzle 1222, thereby reducing the probability of electrolyte leakage. When it is necessary to inject liquid into the battery cell 20, the injection nozzle 1222 is connected to the injection port of the battery cell 20, and the valve 1221 opens the channel between the injection nozzle 1222 and the liquid outlet 111b, so that the electrolyte in the reserve liquid assembly 111 can be injected into the battery cell 20 through the liquid outlet 111b and the injection nozzle 1222 to complete the injection of the battery cell 20.

[0107] It is understandable that the opening and closing of the valve 1221 can be switched by manual control or automatic control, which is not limited here.

[0108] In this embodiment, the valve 1221 and the injection nozzle 1222 are arranged such that when the battery cell 20 is vacuumed, the valve 1221 is closed and the injection nozzle 1222 is separated from the battery cell 20 to reduce the probability of electrolyte leakage in a non-injection state. When the battery cell 20 is injected, the injection nozzle 1222 is docked with the injection port of the battery cell 20 so that the electrolyte is directly and accurately injected into the battery cell 20. When the injection process is completed or no more injection is required, the valve 1221 is closed to achieve precise control of the injection. The injection nozzle 1222 and the injection port of the battery cell 20 are detachable, so that the injection nozzle 1222 and the battery cell 20 can be easily docked or separated from the battery cell 20 for the next injection operation or cleaning and maintenance.

[0109] There is no limitation on the method for separating or connecting the injection nozzle 1222 of the injection assembly 122 and the injection port of the battery cell 20 .

[0110] For example, in some embodiments, please refer to Figure 5 The injection device 12 includes a first lifting mechanism 124, which is used to drive the battery cell 20 to move toward the injection assembly 122 or away from the injection assembly 122, so that the injection port of the battery cell 20 can be docked or separated from the injection nozzle 1222 of the injection assembly 122.

[0111] Specifically, the first lifting mechanism 124 can provide driving force for the battery cell 20 and adjust the position of the battery cell 20. When liquid injection is required, the first lifting mechanism 124 pushes the battery cell 20 until the injection port of the battery cell 20 is completely docked with the injection nozzle 1222 of the injection assembly 122. After the injection is completed, the first lifting mechanism 124 pushes the battery cell 20 to move in the opposite direction to separate the injection port of the battery cell 20 from the injection nozzle 1222 of the injection assembly 122, so as to perform the next injection operation or remove the injected battery cell 20.

[0112] In this embodiment, the first lifting mechanism 124 is used to drive the injection port of the battery cell 20 to dock or separate with the injection nozzle 1222 of the injection assembly 122, so that the position of the battery cell 20 can be accurately controlled, and the docking accuracy of the injection nozzle 1222 and the injection port can be increased. In addition, the position of the battery cell 20 can be adjusted without changing the position of the injection nozzle 1222, and the battery cell 20 that has been injected can be easily removed, thereby increasing the injection reliability.

[0113] The first lifting mechanism 124 can use hydraulic, pneumatic or electric power as a power source, which is not limited here.

[0114] The specific structure of the housing 121 is not limited.

[0115] For some examples, see Figure 5 The shell 121 includes a shell cover 1212 and a base 1211 which are separately arranged. The shell cover 1212 and the base 1211 can be detachably connected along a first direction to jointly define a accommodating cavity 121a. The injection component 122 and the positive and negative pressure switching interface 123 are arranged on the top side of the shell cover 1212.

[0116] The liquid injection device 12 includes a second lifting mechanism 125 , which is connected to the base 1211 and is used to drive the base 1211 to move along a first direction to dock with or separate from the shell cover 1212 .

[0117] It is understandable that the shell cover 1212 and the base 1211 are separately provided, which means that the shell cover 1212 and the base 1211 are manufactured and formed separately. The shell cover 1212 is provided on the top side of the base 1211, and the shell cover 1212 and the base 1211 are connected to form a complete shell 121, and the internal space is the accommodating cavity 121a for accommodating the battery cell 20.

[0118] Specifically, when vacuuming is required, the second lifting mechanism 125 pushes the base 1211 to move along the first direction until the base 1211 is docked with the shell cover 1212 to form a closed accommodating chamber 121a, so that the positive and negative pressure switching interface 123 can vacuum the accommodating chamber 121a and subsequently inject liquid into the battery cell 20. When the injection is completed, the second lifting mechanism 125 pushes the base 1211 to move in the opposite direction along the first direction until the base 1211 is separated from the shell cover 1212, so that it is convenient to take out the battery cell 20 that has been injected and put in a new battery cell 20 for the next round of injection.

[0119] In this embodiment, through the accurate control of the second lifting mechanism 125, the shell cover 1212 and the base 1211 can be reliably docked and separated, thereby facilitating the vacuuming and injection of the battery cell 20 and the removal of the battery cell 20 that has been injected. The separately arranged shell cover 1212 and base 1211 can also facilitate the maintenance and cleaning of the accommodating cavity 121a.

[0120] The second lifting mechanism 125 can use hydraulic, pneumatic or electric power as a power source, which is not limited here.

[0121] It should be noted that the first direction may be any direction. For example, the first direction is parallel to the height direction of the battery filling system 1 .

[0122] For some examples, see Figure 5 The shell 121 includes a locking mechanism 1213, which is arranged on the base 1211 or the top cover. The locking mechanism 1213 is used to lock the shell cover 1212 and the base 1211 when the base 1211 moves to dock with the shell cover 1212, so that the accommodating cavity 121a is in a sealed state.

[0123] It can be understood that the locking mechanism 1213 is a mechanism for locking the target object.

[0124] The locking method of the locking mechanism 1213 is not limited. The locking mechanism 1213 can be locked by snap-on locking, threaded locking, magnetic locking, pneumatic or hydraulic locking.

[0125] In this embodiment, the setting of the locking mechanism 1213 can make the structure of the housing 121 more stable, can further increase the sealing state of the accommodating chamber 121a during the vacuuming process and the liquid injection process, reduce the probability of external air and impurities entering the accommodating chamber 121a, and increase the reliability of the vacuuming process and the liquid injection process. At the same time, during the vacuuming process and the liquid injection process, the locking mechanism 1213 locks the housing cover 1212 and the base 1211, which can reduce the probability of damage to the seal due to impact.

[0126] The specific structure of the first lifting mechanism 124 is not limited.

[0127] For example, in some embodiments, please refer to Figure 5 The first lifting mechanism 124 includes a driving rod 1241 and a top plate 1242. The top plate 1242 is arranged in the accommodating cavity 121a. The top plate 1242 is used to support the battery cell 20. One end of the driving rod 1241 is located in the accommodating cavity 121a and is connected to the top plate 1242. The other end of the driving rod 1241 is located on the bottom side of the outside of the base 1211. The top plate 1242 is used to drive the battery cell 20 to move along the first direction under the driving action of the driving rod 1241, so that the injection port of the battery cell 20 can be docked or separated from the injection nozzle 1222 of the injection assembly 122.

[0128] Specifically, when it is necessary to evacuate the accommodating chamber 121a, the second lifting mechanism 125 drives the base 1211 to move along the first direction to dock with the shell cover 1212. At this time, the second lifting mechanism 125 drives the battery cell 20, the top plate 1242 and the driving rod 1241 located in the accommodating chamber 121a to move along the first direction, but the injection port of the battery cell 20 is not docked with the injection nozzle 1222 of the injection assembly 122, and the driving rod 1241 does not drive the battery cell 20. When the accommodating chamber 121a and the battery cell 20 are in a vacuum state, the driving rod 1241 drives the top plate 1242 to drive the battery cell 20 to continue to move in the first direction in the accommodating chamber 121a, so that the liquid injection port of the battery cell 20 moves toward the liquid injection nozzle 1222 of the liquid injection assembly 122, until the liquid injection port of the battery cell 20 is docked with the liquid injection nozzle 1222 of the liquid injection assembly 122, so that the battery cell 20 is injected with liquid through the liquid injection nozzle 1222. After the battery cell 20 is filled with liquid, the driving rod 1241 drives the top plate 1242 to drive the battery cell 20 to move in the opposite direction along the first direction to separate from the liquid injection nozzle 1222, and the second lifting mechanism 125 then drives the base 1211 and then drives the driving rod 1241, the top plate 1242 and the battery cell 20 to move in the first direction to separate from the shell cover 1212, so that the battery cells 20 that have been injected with liquid can be taken out and the next batch of battery cells 20 to be injected can be put in.

[0129] The power source of the driving rod 1241 may be a motor, and the second lifting mechanism 125 may be a lifting cylinder, etc., which is not limited here.

[0130] In this embodiment, the driving rod 1241 and the top plate 1242 cooperate, and the top plate 1242 plays a supporting role for the battery cell 20. Under the drive of the driving rod 1241, the stability and safety of the battery cell 20 during movement can be further increased. In addition, the position of the battery cell 20 can also be positioned by the top plate 1242, so that the injection port of the battery cell 20 can be accurately docked with the injection nozzle 1222. At the same time, the cooperation of the top plate 1242 and the driving rod 1241 can also adapt to battery cells 20 of different sizes and shapes, and meet the diverse battery injection requirements.

[0131] It is understandable that a limiting structure may be provided on the top plate 1242 to limit the battery cell 20 and reduce shaking and displacement of the battery cell 20 during movement.

[0132] In some embodiments, the cross-section of the housing 121 along a first direction perpendicular to the first direction is rectangular, wherein the first direction is parallel to the top and bottom directions of the battery filling system 1 .

[0133] In this embodiment, the cross-sectional shape of the shell 121 is designed so that the shell 121 has enough space to accommodate the battery cells 20, so that the battery cells 20 can be closely arranged in the shell 121. At the same time, the rectangular shape can also make the shell 121 stable and easy to maintain.

[0134] The specific structure of the liquid preparation component 111 is not limited.

[0135] For some examples, see Figure 4 The liquid preparation component 111 includes a liquid preparation cup 1111 and a positive pressure liquid injection interface 111d. The liquid preparation cup 1111 has a liquid inlet 111a, a liquid storage space 111c and a liquid outlet 111b. The liquid inlet 111a is used to introduce the liquid to be injected into the liquid storage space 111c. The positive pressure liquid injection interface 111d is not connected to the liquid inlet 111a but is connected to the liquid storage space 111c. The positive pressure liquid injection interface 111d is used to introduce gas to transport the liquid to be injected in the liquid storage space 111c to the battery cell 20 through the liquid outlet 111b and the liquid injection component 122.

[0136] Specifically, the liquid inlet 111a is used to introduce the liquid to be injected into the liquid storage space 111c, and the liquid storage space 111c is used to store the liquid to be injected. The liquid to be injected leaves the liquid preparation component 111 from the liquid storage space 111c through the liquid outlet 111b and enters the liquid injection component 122.

[0137] The positive pressure liquid injection interface 111d and the liquid inlet 111a are not connected to each other, which means that the positive pressure liquid injection interface 111d and the liquid inlet 111a do not interfere with each other, the positive pressure liquid injection interface 111d and the liquid inlet 111a are respectively connected to the liquid storage space 111c, and the channel between the positive pressure liquid injection interface 111d and the liquid storage space 111c and the channel between the liquid inlet 111a and the liquid storage space 111c do not have an intersecting part, that is, the positive pressure liquid injection interface 111d does not interfere with the liquid to be injected entering the liquid storage space 111c from the liquid inlet 111a.

[0138] The positive pressure injection interface 111 d introduces gas into the liquid storage space 111 c , and the pressure in the liquid storage space 111 c increases, forcing the liquid to be injected to flow out of the liquid storage space 111 c through the liquid outlet 111 b and be transported to the battery cell 20 through the injection assembly 122 .

[0139] In this embodiment, the liquid to be injected enters the liquid storage space 111c from the liquid inlet 111a to complete the liquid preparation. The positive and negative pressure switching interface 123 can simultaneously evacuate the accommodating chamber 121a and the battery cell 20 located in the accommodating chamber 121a. After the vacuum is exhausted, the positive pressure injection interface 111d injects gas into the liquid storage space 111c. Under the action of the gas, the liquid to be injected flows through the liquid outlet 111b to the injection assembly 122 and then to the battery cell 20 to complete the injection of the battery cell 20. The positive pressure injection method can control the delivery rate of the liquid to be injected. At the same time, the positive and negative pressure switching interface 123 also cooperates to introduce gas into the accommodating chamber 121a, so that the internal and external pressures of the battery cell 20 are equal, thereby increasing the injection stability of the battery cell 20.

[0140] For some examples, see Figure 3 and Figure 4 The liquid preparation component 111 includes a blocking member 1112, and the blocking member 1112 can open or block the liquid inlet 111a.

[0141] Specifically, when preparing the liquid, the sealing member 1112 opens the liquid inlet 111a, so that the liquid to be injected can enter the liquid storage space 111c from the liquid inlet 111a. When the liquid preparation is completed, the sealing member 1112 closes the liquid inlet 111a to reduce the probability of impurities entering the liquid storage space 111c, and at the same time facilitates the introduction of gas into the liquid storage space 111c from the positive pressure injection interface 111d, so that the liquid to be injected flows from the liquid storage space 111c to the injection assembly 122, thereby injecting the battery cell 20.

[0142] There is no limit to the way to switch the blocking member 1112 between the position of opening the liquid inlet 111a and the position of closing the liquid inlet 111a. It can be manually operated or automatically controlled. For example, the blocking member 1112 can be driven by a cylinder to move to open or close the liquid inlet 111a.

[0143] For some examples, see Figure 3 and Figure 4 The liquid preparation component 111 also includes a negative pressure liquid injection interface 111e, which is not connected to the liquid inlet 111a but is connected to the liquid storage space 111c, and is used to evacuate the liquid storage space 111c.

[0144] Specifically, the negative pressure liquid injection interface 111e and the liquid inlet 111a are not connected to each other, which means that the negative pressure liquid injection interface 111e and the liquid inlet 111a do not interfere with each other, the negative pressure liquid injection interface 111e and the liquid inlet 111a are respectively connected to the liquid storage space 111c, and the channel between the negative pressure liquid injection interface 111e and the liquid storage space 111c and the channel between the liquid inlet 111a and the liquid storage space 111c do not have an intersecting part, that is, the negative pressure liquid injection interface 111e does not interfere with the liquid to be injected entering the liquid storage space 111c from the liquid inlet 111a.

[0145] The negative pressure injection interface 111e is used to evacuate the liquid storage space 111c. When the liquid to be injected does not flow smoothly through the injection assembly 122 to the battery cell 20 under the action of the gas introduced by the positive pressure injection interface 111d, the introduction of gas can be stopped, and the liquid storage space 111c can be evacuated through the negative pressure injection interface 111e to generate suction force on the liquid to be injected, adjust the flow of the liquid to be injected, and then close the negative pressure injection interface 111e, and then introduce gas through the positive pressure injection interface 111d to continue injection.

[0146] In this embodiment, through the cooperation of the negative pressure injection interface 111e and the positive pressure injection interface 111d, when the smoothness of the positive pressure injection decreases, the flow of the liquid to be injected is regulated by negative pressure suction, making the positive pressure injection smoother, thereby increasing the injection efficiency of the battery cell 20.

[0147] It should be noted that the liquid injection of the battery can be completed by only introducing gas through the positive pressure injection interface 111d, that is, in the positive pressure injection mode, the battery cell 20 can be filled with liquid at one time, and at this time, the negative pressure injection interface 111e is not needed to assist in suction. If the positive pressure injection is not smooth enough, the positive pressure injection interface 111d and the negative pressure injection interface 111e can be opened alternately to inject liquid. At this time, the number of negative pressure suction can be one time or multiple times, which can be adapted according to the model of the battery cell 20.

[0148] For some examples, see Figure 4 The positive pressure injection interface 111d is connected to the liquid storage space 111c through the first channel 111f, and the negative pressure injection interface 111e is connected to the liquid storage space 111c through the second channel 111g. At least part of the first channel 111f and the second channel 111g overlap.

[0149] It can be understood that the at least partial overlap of the first channel 111f and the second channel 111g means that the passage between the positive pressure injection interface 111d and the liquid storage space 111c and the passage between the negative pressure injection interface 111e and the liquid storage space 111c are at least partially shared and share the same physical path.

[0150] In this embodiment, the first channel 111f and the second channel 111g at least partially overlap, which can reduce the need for additional pipelines, making the structure of the entire liquid preparation component 111 more compact and occupying less space, and liquid injection is achieved by alternating the positive pressure liquid injection interface 111d and the negative pressure liquid injection interface 111e.

[0151] It can be understood that the positive pressure liquid injection interface 111d and the negative pressure liquid injection interface 111e can be opened or closed by means of a switch valve respectively. When gas needs to be introduced, the positive pressure liquid injection interface 111d is opened, the negative pressure liquid injection interface 111e is closed, and the positive pressure liquid injection interface 111d is connected to the first channel 111f to introduce gas into the liquid storage space 111c; when the positive pressure liquid injection is not smooth, the positive pressure liquid injection interface 111d is closed, the negative pressure liquid injection interface 111e is opened, and the negative pressure liquid injection interface 111e is connected to the second channel 111g to evacuate the liquid storage space 111c.

[0152] It can be understood that in some examples, after the negative pressure liquid injection interface 111e evacuates the liquid storage space 111c, the pressure in the liquid storage space 111c is not less than -90kpa (kilopascals), for example, -90kpa, -80kpa, -75kpa, -50kpa, -30kpa, -20kpa, etc., that is, under the action of the negative pressure liquid injection interface 111e, the liquid storage space 111c is roughly in a low vacuum environment. Under such pressure environment, the electrolyte is not easy to crystallize, that is, when the first channel 111f and the second channel 111g at least partially overlap, the probability of electrolyte crystallization can also be reduced and the positive pressure liquid injection rate can be increased.

[0153] It should be noted that after the positive and negative pressure switching interface 123 evacuates the accommodating chamber 121a and the battery cell 20, the pressure inside the accommodating chamber 121a and the battery cell 20 is no more than -95kpa, for example -95kpa, -100kpa, -120kpa, -150kpa, -170kpa, -180kpa, etc. That is to say, under the action of the positive and negative pressure switching interface 123, the accommodating chamber 121a and the battery cell 20 are roughly in a high vacuum environment. Under this pressure environment, the oxygen and moisture inside the battery cell 20 can be effectively removed, and the electrolyte can fully contact the positive and negative electrodes of the battery during injection, thereby increasing battery performance.

[0154] The specific structures of the liquid preparation component 111 and the moving mechanism 113 are not limited.

[0155] For some examples, see Figure 2 The liquid preparation component 111 includes a plurality of liquid preparation cups 1111 spaced apart along the second direction. The number of the liquid preparation components 111 is multiple, and the multiple liquid preparation components 111 are fixed on the frame 10 and arranged side by side along the third direction.

[0156] The moving mechanism 113 includes a first transfer module 1131 , a second transfer module 1132 and a third transfer module 1133 . The liquid separation valve 112 is connected to the first transfer module 1131 . The first transfer module 1131 is used to drive the liquid separation valve 112 to move along a first direction.

[0157] The second moving module 1132 extends along the second direction. The first moving module 1131 is disposed on the second moving module 1132. The second moving module 1132 is used to drive the first moving module 1131 to move along the second direction.

[0158] The third transfer module 1133 is connected to the frame 10 and extends along the third direction. The second transfer module 1132 is disposed on the third transfer module 1133 , and the third transfer module 1133 is used to drive the second transfer module 1132 to move along the third direction.

[0159] The first direction, the second direction and the third direction are perpendicular to each other.

[0160] Specifically, the liquid preparation component 111 includes a plurality of liquid preparation cups 1111, which are arranged at intervals along the second direction, and the plurality of liquid preparation components 111 are arranged side by side along the third direction to form a two-dimensional array structure. The first module is directly connected to the liquid separation valve 112, and the liquid separation valve 112 is driven to move along the first direction to achieve the docking and separation of the liquid separation port of the liquid separation valve 112 and the liquid inlet 111a of the liquid preparation cup 1111. The second transfer module 1132 carries the first transfer module 1131, and is used to drive the first transfer module 1132 to move the liquid separation port 112 and the liquid inlet 111a of the liquid preparation cup 1111. A transfer module 1131 moves along the second direction to complete the filling of different preparation cups 1111 of a preparation liquid component 111. The third transfer module 1133 is connected to the frame 10. The third transfer module 1133 carries the second transfer module 1132, and is used to drive the second transfer module 1132, the first transfer module 1131 and the liquid dividing valve 112 to move along the third direction to realize the movement of the liquid dividing valve 112 in different preparation liquid components 111, thereby completing the preparation of liquid for different preparation liquid components 111.

[0161] In this embodiment, by moving in three-dimensional space, the moving mechanism 113 can quickly and accurately switch between multiple reserve liquid cups 1111, and adapt to the reserve liquid requirements of the reserve liquid cups 1111 at different positions, thereby improving the injection efficiency. The battery injection system 1 can prepare liquid for multiple reserve liquid assemblies 111, thereby facilitating the simultaneous injection of battery cells 20 arranged in a two-dimensional array structure, thereby increasing the injection efficiency.

[0162] In a specific embodiment, please refer to Figures 1 to 5 The battery liquid filling system 1 includes a frame 10, a liquid preparation device 11 and a liquid filling device 12. The liquid preparation device 11 includes a liquid separation valve 112, a moving mechanism 113 and a plurality of liquid preparation components 111 arranged side by side along the third direction, each liquid preparation component 111 includes a plurality of liquid preparation cups 1111 arranged at intervals along the second direction, the liquid preparation cup 1111 has a liquid inlet 111a, a liquid storage space 111c and a liquid outlet 111b, and the liquid preparation component 111 is also provided with a positive pressure liquid injection interface 111d and a negative pressure liquid injection interface 111e, the positive pressure liquid injection interface 111d is not connected to the liquid inlet 111a and is connected to the liquid storage space 111c, the negative pressure liquid injection interface 111e is not connected to the liquid inlet 111a and is connected to the liquid storage space 111c, and the channel between the positive pressure liquid injection interface 111d and the liquid storage space 111c and the channel between the negative pressure liquid injection interface 111e and the liquid storage space 111c at least partially overlap. The moving mechanism 113 includes a first moving module 1131 , a second moving module 1132 and a third moving module 1133 .

[0163] The liquid injection device 12 includes a shell 121, a liquid injection assembly 122, a positive and negative pressure switching interface 123, a first lifting mechanism 124 and a second lifting mechanism 125. The shell 121 has a receiving chamber 121a for receiving the battery cell 20. The shell 121 includes a shell cover 1212 and a base 1211 that are separately arranged. The second lifting mechanism 125 is connected to the base 1211. The positive and negative pressure switching interface 123 and the liquid injection assembly 122 are arranged on the shell cover 1212 and are not connected to each other. The liquid injection assembly 122 includes a valve 1221 and a liquid injection nozzle 1222. The first lifting mechanism 124 includes a driving rod 1241 and a top plate 1242. The top plate 1242 is arranged in the receiving chamber 121a and is used to support the battery cell 20. The driving rod 1241 extends into the receiving chamber 121a and is connected to the top plate 1242. The first direction is parallel to the top and bottom directions.

[0164] In the liquid preparation stage, the first transfer module 1131, the second transfer module 1132, and the third transfer module 1133 cooperate with each other to drive the liquid separation valve 112 to move along the three-dimensional space, so as to achieve the docking and separation of the liquid separation port of the liquid separation valve 112 and the liquid inlets 111a of different liquid preparation components 111, so as to complete the liquid preparation. In the liquid preparation process, the positive pressure liquid injection interface 111d and the negative pressure liquid injection interface 111e are both in a closed state.

[0165] During the vacuuming stage, the second lifting mechanism 125 pushes the base 1211 and drives the first lifting mechanism 124 and the battery cell 20 to move toward the top side to achieve docking of the base 1211 and the shell cover 1212. The base 1211 is provided with a locking mechanism 1213. When the base 1211 and the shell cover 1212 are docked, the locking structure locks the base 1211 and the shell cover 1212 to increase the sealing of the accommodating chamber 121a. The injection port of the battery cell 20 and the injection nozzle 1222 of the injection assembly 122 are spaced apart, the valve 1221 of the injection assembly 122 is closed, and the positive and negative pressure switching interface 123 evacuates the accommodating chamber 121a and the battery cell 20 located in the accommodating chamber 121a, so that the inside of the battery cell 20 is in a vacuum environment.

[0166] It is understandable that the liquid preparation stage and the vacuuming stage can be performed simultaneously.

[0167] During the injection stage, the driving rod 1241 drives the top plate 1242 to drive the battery cell 20 to move toward the top side so that the injection port of the battery cell 20 is connected to the injection nozzle 1222, the valve 1221 of the injection assembly 122 is opened, the injection nozzle 1222 is connected to the liquid outlet 111b of the liquid preparation assembly 111, and gas is introduced into the liquid storage space 111c through the positive pressure injection interface 111d. The liquid to be injected flows toward the injection assembly 122 under the action of the gas and passes through the injection. The liquid flows to the battery cell 20 through the nozzle 1222. At this time, the positive and negative pressure switching interface 123 introduces gas into the accommodating chamber 121a to make the internal and external pressures of the battery cell 20 equal and reduce the probability of battery swelling. If the positive pressure injection is smooth, the positive pressure injection is continued until the battery cell 20 is full of liquid. If the positive pressure injection is blocked, the positive pressure injection interface 111d and the negative pressure injection interface 111e are alternately operated to improve the smoothness of the positive pressure injection until the battery cell 20 is full of liquid. When the injection of the battery cell 20 is completed, the driving rod 1241 drives the top plate 1242 to drive the battery cell 20 to move to the bottom side so that the injection port of the battery cell 20 is separated from the injection nozzle 1222. The second lifting mechanism 125 pushes the base 1211 to move downward to separate the base 1211 from the shell cover 1212, so as to facilitate the removal of the battery cell 20 filled with liquid and replace it with a new batch of battery cells 20 to be injected.

[0168] In this way, the battery filling system 1 provided in the embodiment of the present application does not interfere with the vacuuming path and the filling path of the battery cell 20, thereby reducing the probability of electrolyte crystallization and blocking the vacuuming path. Moreover, the vacuuming and liquid preparation of the battery cell 20 can be carried out simultaneously without interfering with each other, thereby increasing the overall working efficiency of the battery filling system 1.

[0169] A second aspect of an embodiment of the present application provides a battery filling method.

[0170] It can be understood that the battery filling method of the embodiment of the present application can be applied to the battery filling system 1 of any embodiment of the first aspect mentioned above.

[0171] See also Figure 6 , the battery filling method includes:

[0172] S101: Liquid preparation step: injecting the liquid to be injected into the liquid storage space 111c of the liquid preparation component 111.

[0173] S201: Vacuuming step: sealing the accommodating chamber 121a, and controlling the positive and negative pressure switching interface 123 to evacuate the accommodating chamber 121a when the liquid injection port of the battery cell 20 and the liquid injection assembly 122 are separated, wherein the battery cell 20 is accommodated in the accommodating chamber 121a.

[0174] S102: Liquid injection step: Control the movement of the battery cell 20 so that the liquid injection port of the battery cell 20 docks with the liquid injection assembly 122, and inject the liquid to be injected in the reserve liquid assembly 111 into the battery cell 20 through the liquid injection assembly 122, and during the liquid injection process, control the positive and negative pressure switching interface 123 to pass gas into the accommodating cavity 121a.

[0175] The positive and negative pressure switching interface 123 and the liquid injection component 122 are not connected to each other.

[0176] Here, the liquid preparation step refers to injecting liquid into the liquid storage space 111c of the liquid preparation component 111. Specifically, the liquid preparation can be achieved by controlling the liquid separation valve 112 to dock with the liquid inlet 111a of the liquid preparation component 111 through the moving mechanism 113.

[0177] Here, the vacuuming step refers to vacuuming the battery cell 20. Specifically, the second lifting mechanism 125 can drive the base 1211 to move and achieve docking with the shell cover 1212 to seal the accommodating cavity 121a, and the injection port of the battery cell 20 and the injection nozzle 1222 of the injection assembly 122 are separated, so that when the positive and negative pressure switching interface 123 vacuums the accommodating cavity 121a, the battery cell 20 can also be vacuumed, so that the battery cell 20 is in a vacuum state.

[0178] It can be understood that the liquid preparation step and the vacuuming step have at least a time overlap, that is, the liquid preparation step and the vacuuming step can be performed almost simultaneously, that is, in the same time period, both the liquid preparation and the vacuuming operation can be performed.

[0179] Here, the liquid injection step refers to injecting liquid into the battery cell 20. Specifically, the battery cell 20 can be driven to move by the first lifting mechanism 124 so that the liquid injection port of the battery cell 20 is docked with the liquid injection nozzle 1222, and the liquid injection nozzle 1222 is connected with the liquid outlet 111b of the reserve liquid component 111, and the liquid to be injected in the reserve liquid component 111 is injected into the battery cell 20 through the liquid injection component 122, and the positive and negative pressure switching interface 123 introduces gas into the accommodating cavity 121a to make the internal and external pressures of the battery cell 20 equal.

[0180] Here, the positive and negative pressure switching interface 123 and the liquid injection component 122 are not connected to each other, which means that the positive and negative pressure switching interface 123 and the liquid injection component 122 do not interfere with each other, and the liquid to be injected in the liquid injection component 122 will not enter the positive and negative pressure switching interface 123.

[0181] In this embodiment, the liquid preparation step and the vacuuming step do not interfere with each other, the liquid injection path and the vacuuming path are separated, the probability of electrolyte crystallization is low, and during the liquid injection process, the positive and negative pressure switching interface 123 can assist in balancing the internal and external pressures of the battery cell 20, thereby improving the liquid injection efficiency and liquid injection reliability of the battery cell 20.

[0182] In some embodiments, the liquid to be injected in the liquid preparation assembly 111 is injected into the battery cell 20 via the liquid injection assembly 122, including:

[0183] Positive pressure injection: Control the positive pressure injection interface 111 d of the liquid reserve component 111 to pass gas into the liquid storage space 111 c of the liquid reserve component 111 to inject all the electrolyte required by the battery cell 20 into the battery cell 20 .

[0184] Here, the positive pressure injection interface 111d is used to introduce gas into the liquid storage space 111c, so that the electrolyte flows to the battery cell 20 through the injection nozzle 1222 under the action of the gas until the battery cell 20 is filled with liquid.

[0185] In this embodiment, the positive pressure injection method is adopted, which can further improve the injection efficiency and shorten the time required for the battery cell 20 to be fully filled with liquid.

[0186] In some embodiments, the liquid to be injected in the liquid preparation assembly 111 is injected into the battery cell 20 via the liquid injection assembly 122 , including alternating positive pressure injection and negative pressure suction.

[0187] Positive pressure injection: close the negative pressure injection interface 111e of the liquid preparation component 111, and control the positive pressure injection interface 111d of the liquid preparation component 111 to pass gas into the liquid storage space 111c of the liquid preparation component 111.

[0188] Negative pressure suction: close the positive pressure liquid injection interface 111d of the liquid preparation component 111, and control the negative pressure liquid injection interface 111e of the liquid preparation component 111 to vacuum the liquid storage space 111c of the liquid preparation component 111.

[0189] Here, the alternating execution of positive pressure injection and negative pressure suction means that the positive pressure injection and negative pressure suction are performed alternately, after the positive pressure injection for a first preset time, the positive pressure injection is stopped, the negative pressure suction is performed for a second preset time, and then the negative pressure suction is stopped again, and the positive pressure injection is started, and so on, in a cycle.

[0190] Specifically, during positive pressure injection, the negative pressure injection interface 111e is closed, and gas is introduced into the liquid storage space 111c to allow the electrolyte to flow toward the battery cell 20 under the action of the gas. When the flow smoothness of the electrolyte decreases during positive pressure injection, the positive pressure injection interface 111d is closed, the negative pressure injection interface 111e is opened, and the liquid storage space 111c is evacuated to adjust the flow smoothness of the electrolyte. Then, the negative pressure injection interface 111e is closed again, and the battery cell 20 is continued to be injected with positive pressure. This process is performed alternately until the battery cell 20 is filled with liquid.

[0191] It is understandable that the number of alternating positive pressure injection and negative pressure suction can be once or multiple times, and there is no limitation here.

[0192] In this embodiment, by combining positive pressure injection and negative pressure suction, the flow of the electrolyte can be adjusted in time, so that the positive pressure injection is smoother and the injection efficiency of the battery cell 20 is increased.

[0193] It is understandable that the positive pressure injection or the combination of positive pressure injection and negative pressure suction can be used to perform the injection according to the battery model and the like.

[0194] The following combination Figure 7 A battery filling method according to an application embodiment of the present application is briefly described.

[0195] S301 : Control the blocking member 1112 to open the liquid inlet 111 a , and inject liquid into the liquid storage space 111 c of the liquid reserve assembly 111 when the liquid separation port of the liquid separation valve 112 is connected to the liquid inlet 111 a of the liquid reserve assembly 111 .

[0196] Here, the liquid separation valve 112 can be controlled to move in three-dimensional space through the moving mechanism 113, so that the liquid separation port can be docked or separated with the liquid inlet 111a of the reserve liquid component 111, thereby completing the liquid preparation of the reserve liquid component 111, so that the liquid storage space 111c of the reserve liquid component 111 stores the electrolyte required to fill the battery cell 20 with liquid.

[0197] S302: Control the blocking member 1112 to close the liquid inlet 111a.

[0198] Here, after the liquid preparation is completed, the blocking member 1112 is controlled to close the liquid inlet 111 a to reduce the probability of impurities entering the liquid storage space 111 c.

[0199] S401: Control the second lifting mechanism 125 to drive the base 1211 to move along the first direction until it docks with the shell cover 1212, and control the locking mechanism 1213 to lock the shell cover 1212 and the base 1211 to seal the accommodating cavity 121a.

[0200] Here, the second lifting mechanism 125 drives the first lifting mechanism 124, the battery cell 20 and the base 1211 to move together. When the base 1211 is docked with the shell cover 1212, the locking mechanism 1213 locks the shell cover 1212 and the base 1211 to make the accommodating cavity 121a in a sealed state. At this time, the filling port of the battery cell 20 is separated from the filling nozzle 1222 of the filling assembly 122.

[0201] S402: Close the valve 1221 of the liquid injection assembly 122, and when the liquid injection port of the battery cell 20 is separated from the liquid injection assembly 122, control the positive and negative pressure switching interface 123 to evacuate the accommodating chamber 121a, wherein the positive and negative pressure switching interface 123 and the liquid injection assembly 122 are not connected to each other.

[0202] Here, the positive and negative pressure switching interface 123 evacuates the accommodating chamber 121a, thereby completing the evacuation of the battery cell 20. The positive and negative pressure switching interface 123 and the injection component 122 are not connected to each other. The electrolyte in the injection component 122 will not flow to the positive and negative pressure switching interface 123, and the probability of electrolyte crystallization is low.

[0203] It is understandable that the liquid preparation steps S301 and S302 and the vacuuming steps S401 and S402 can be performed simultaneously.

[0204] S303: Control the first lifting mechanism 124 to drive the battery cell 20 to move along the first direction until the filling port is docked with the filling nozzle 1222 of the filling assembly 122, open the valve 1221 of the filling assembly 122, control the positive pressure injection interface 111d to allow air to pass into the liquid storage space 111c, inject the liquid to be injected in the reserve liquid assembly 111 into the battery cell 20, and control the positive and negative pressure switching interface 123 to allow gas to pass into the accommodating cavity 121a.

[0205] Here, when the battery cell to be injected can be fully injected with one positive pressure injection, the positive pressure injection method is used. At this time, the negative pressure injection interface 111e is always in a closed state, and the gas introduced through the positive pressure injection interface 111d causes the electrolyte to flow toward the battery cell 20.

[0206] S304: Control the first lifting mechanism 124 to drive the battery cell 20 to move along the first direction until the filling port is docked with the filling nozzle 1222 of the filling assembly 122, open the valve 1221 of the filling assembly 122, control the positive pressure injection interface 111d and the negative pressure injection interface 111e to operate alternately, inject the liquid to be injected in the reserve liquid assembly 111 into the battery cell 20, and control the positive and negative pressure switching interface 123 to allow gas to enter the accommodating cavity 121a.

[0207] Here, when the battery cell that needs to be filled is easily blocked by a single positive pressure filling and cannot meet the filling requirement, the positive pressure filling and negative pressure suction are alternately performed to increase the filling smoothness and complete the filling of the battery cell 20 .

[0208] S305 : controlling the first lifting mechanism 124 to drive the battery cell 20 to move to separate from the injection nozzle 1222 , controlling the locking mechanism 1213 to unlock, and controlling the second lifting mechanism 125 to drive the base 1211 to move to separate from the shell cover 1212 .

[0209] Here, after the battery cell is filled with liquid, the first lifting mechanism 124 is used to first separate the battery cell 20 from the liquid filling nozzle 1222, and then the locking mechanism 1213 releases the lock on the shell cover 1212 and the base 1211, and then the second lifting mechanism 125 is controlled to drive the battery cell 20 and the first lifting mechanism 124 to move so that the base 1211 is separated from the shell cover 1212.

[0210] S306: Take out the battery cell 20 and enter the next round of liquid injection.

[0211] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the present application.

Claims

1. A battery filling system, characterized in that: include: frame; A liquid preparation device connected to the frame, the liquid preparation device comprising a liquid preparation component, the liquid preparation component is used to store the liquid to be injected, and the liquid preparation component has a liquid outlet; A liquid injection device is connected to the frame, the liquid injection device comprises a shell, a liquid injection assembly and a positive and negative pressure switching interface, the shell has a receiving chamber for receiving a battery cell, the liquid injection assembly and the positive and negative pressure switching interface are both arranged in the shell and are not connected to each other, the positive and negative pressure switching interface is used to evacuate the receiving chamber in a sealed state and the battery cell located in the receiving chamber before liquid injection, and to introduce gas into the receiving chamber in a vacuum state during liquid injection, the liquid outlet of the reserve liquid assembly is connected to the liquid injection assembly, the liquid injection assembly is used to inject liquid into the battery cell accommodated in the receiving chamber, the reserve liquid assembly and the positive and negative pressure switching interface are not connected to each other, so as to realize the simultaneous implementation of the vacuuming step and the liquid preparation step; The liquid preparation device comprises a moving mechanism and a liquid separation valve, wherein the liquid separation valve has a liquid separation port, the liquid separation valve is arranged on the top side of the liquid preparation component, and the moving mechanism is used to drive the liquid separation valve to move so that the liquid separation port and the liquid inlet of the liquid preparation component can be detachably docked; The liquid preparation component comprises a liquid preparation cup and a positive pressure liquid injection interface, wherein the liquid preparation cup has a liquid inlet, a liquid storage space and the liquid outlet, wherein the liquid inlet is used to introduce the liquid to be injected into the liquid storage space, the positive pressure liquid injection interface is not connected to the liquid inlet but is connected to the liquid storage space, and the positive pressure liquid injection interface is used to introduce gas to transport the liquid to be injected in the liquid storage space to the battery cell through the liquid outlet and the liquid injection component; The liquid preparation component also includes a negative pressure liquid injection interface, which is not connected to the liquid inlet but is connected to the liquid storage space and is used to evacuate the liquid storage space.

2. The battery filling system according to claim 1, characterized in that: The liquid injection assembly includes a valve and a liquid injection nozzle, the valve connects the liquid outlet and the liquid injection nozzle, the liquid injection nozzle is used to detachably dock with the liquid injection port of the battery cell, and the valve is used to open or close the channel between the liquid injection nozzle and the liquid outlet.

3. The battery filling system according to claim 1, characterized in that: The injection device includes a first lifting mechanism, which is used to drive the battery cell to move toward the injection assembly or away from the injection assembly to dock or separate the injection port of the battery cell with the injection nozzle of the injection assembly.

4. The battery filling system according to claim 3, characterized in that: The housing comprises a shell cover and a base which are separately arranged, the shell cover and the base are detachably connected along a first direction to jointly define the accommodating cavity, and the liquid injection assembly and the positive and negative pressure switching interface are arranged on the top side of the shell cover; The liquid injection device includes a second lifting mechanism, which is connected to the base and is used to drive the base to move along the first direction to dock with or separate from the shell cover.

5. The battery filling system according to claim 4, characterized in that: The shell includes a locking mechanism, which is arranged on the base or the top cover. The locking mechanism is used to lock the shell cover and the base when the base moves to dock with the shell cover, so that the accommodating cavity is in a sealed state.

6. The battery filling system according to claim 4, characterized in that: The first lifting mechanism includes a driving rod and a top plate, wherein the top plate is arranged in the accommodating cavity and is used to support the battery cell. One end of the driving rod is located in the accommodating cavity and is connected to the top plate, and the other end of the driving rod is located on the bottom side of the outside of the base. The top plate is used to drive the battery cell to move along the first direction under the driving action of the driving rod, so that the injection port of the battery cell can be docked or separated from the injection nozzle of the injection assembly.

7. The battery liquid injection system according to any one of claims 1 to 6, characterized in that: The cross-section of the shell along a first direction perpendicular to the first direction is rectangular, wherein the first direction is parallel to the top and bottom directions of the battery filling system.

8. The battery filling system according to claim 1, characterized in that: The liquid preparation component includes a blocking piece, and the blocking piece can open or block the liquid inlet.

9. The battery filling system according to claim 1, characterized in that: The positive pressure injection interface is communicated with the liquid storage space through a first channel, and the negative pressure injection interface is communicated with the liquid storage space through a second channel. The first channel and the second channel at least partially overlap.

10. The battery filling system according to claim 1, characterized in that: The liquid preparation component includes a plurality of liquid preparation cups spaced apart along the second direction, the number of the liquid preparation components is multiple, and the multiple liquid preparation components are fixed on the frame and arranged side by side along the third direction; The moving mechanism includes a first transfer module, a second transfer module and a third transfer module, the liquid separation valve is connected to the first transfer module, and the first transfer module is used to drive the liquid separation valve to move along a first direction; The second transfer module extends along the second direction, the first transfer module is arranged on the second transfer module, and the second transfer module is used to drive the first transfer module to move along the second direction; The third transfer module is connected to the frame and extends along the third direction, the second transfer module is arranged on the third transfer module, and the third transfer module is used to drive the second transfer module to move along the third direction; The first direction, the second direction, and the third direction are perpendicular to each other.

11. A battery filling method, applied to the battery filling system according to any one of claims 1 to 10, the battery filling method comprising: Liquid preparation step: injecting the liquid to be injected into the liquid storage space of the liquid preparation component; Vacuuming step: sealing the accommodating cavity, and in a state where the liquid injection port of the battery cell and the liquid injection assembly are separated, controlling the positive and negative pressure switching interface to evacuate the accommodating cavity, wherein the battery cell is accommodated in the accommodating cavity; Liquid injection step: controlling the battery cell to move so that the liquid injection port of the battery cell docks with the liquid injection assembly, and injecting the liquid to be injected in the reserve liquid assembly into the battery cell through the liquid injection assembly, and controlling the positive and negative pressure switching interface to pass gas into the accommodating cavity during the liquid injection process; Wherein, the positive and negative pressure switching interface is not connected to the liquid injection component.

12. The battery liquid filling method according to claim 11, characterized in that: The step of injecting the liquid to be injected in the liquid reserve assembly into the battery cell via the liquid injection assembly comprises: Positive pressure injection: Control the positive pressure injection interface of the liquid reserve component to pass gas into the liquid storage space of the liquid reserve component, so as to inject all the liquid to be injected in the required amount of the battery cell into the battery cell.

13. The battery liquid filling method according to claim 11, characterized in that: The step of injecting the liquid to be injected in the liquid preparation assembly into the battery cell via the liquid injection assembly comprises alternately performing positive pressure injection and negative pressure suction, wherein: Positive pressure injection: closing the negative pressure injection interface of the liquid preparation component, and controlling the positive pressure injection interface of the liquid preparation component to inject gas into the liquid storage space of the liquid preparation component; Negative pressure suction: close the positive pressure injection interface of the liquid preparation component, and control the negative pressure injection interface of the liquid preparation component to vacuum the liquid storage space of the liquid preparation component.

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