Electrolyte injection system and electrolyte injection method for battery

Abstract

An electrolyte injection system and electrolyte injection method for a battery. The electrolyte injection system comprises a mounting base (1), an electrolyte injection module (2), and a weighing module (3). The electrolyte injection module (2) comprises a tray (21) and electrolyte injection tanks (22). The weighing module (3) is arranged on the mounting base (1). The electrolyte injection tanks (22) have a pre-assembled state and an assembled state. When in the pre-assembled state, the electrolyte injection tanks (22) are pre-assembled on the tray (21), the weight of the electrolyte injection tanks (22) being borne by the tray (21). When in the assembled state, the electrolyte injection tanks (22) are assembled on the weighing module (3), the weight of the electrolyte injection tanks (22) being borne by the weighing module (3). The weighing module (3) is used for weighing the electrolyte injection tanks (22). The electrolyte injection system is provided with the weighing module (3) for weighing the electrolyte injection tanks (22) in real time so as to acquire the quantity of an electrolyte injected into the electrolyte injection tanks (22), does not need an electrolyte injection pump for controlling the quantity of the injected electrolyte, and likewise does not require a bubble removing action, thus improving electrolyte preparation efficiency.

Description

Battery injection system and injection method

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure is based on Chinese patent application number 202410009314.1, application date January 3, 2024, and invention name “A battery injection system and injection method”, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into the present disclosure as a reference. Technical Field

[0003] The present disclosure relates to the technical field of batteries, and in particular to a battery injection system and injection method. Background Art

[0004] This section is intended to provide a background or context for the embodiments of the present disclosure. No admission is made that the description herein is prior art by virtue of its inclusion in this section.

[0005] In the related art, a liquid storage tank is required to store the electrolyte transported from the electrolyte room. The injection pump pumps the electrolyte in the liquid storage tank into the containing device in a quantitative manner. After the battery is vacuumed, the injection valve of the containing device is opened, and the electrolyte in the containing device is injected into the injection cup. It can be seen that each injection cup requires a corresponding injection pump, and a liquid storage tank and a containing device are required to store the electrolyte transported from the electrolyte room, which takes up space and increases equipment costs. In addition, the injection pump is used to control the injection amount of the electrolyte. The bubbles in the electrolyte will reduce the control accuracy of the electrolyte injection amount. The electrolyte also needs to be de-bubbled and filtered for impurities, which reduces the efficiency of liquid preparation.

[0006] Summary of the Invention

[0007] In view of this, the embodiments of the present disclosure hope to provide a battery injection system and injection method, which does not require an injection pump to control the injection volume, nor does it require bubble removal, thereby reducing costs and occupied space and improving liquid preparation efficiency.

[0008] To achieve the above objectives, a first aspect of an embodiment of the present disclosure provides a battery injection system, comprising:

[0009] Mounting seat;

[0010] A liquid injection module, including a tray and a liquid injection cup;

[0011] A weighing module is arranged on the mounting base;

[0012] Among them, the liquid filling cup includes a pre-installed state and an assembled state. When the liquid filling cup is in the pre-installed state, the liquid filling cup is pre-installed on the tray, and the weight of the liquid filling cup is borne by the tray; when the liquid filling cup is in the assembled state, the liquid filling cup is assembled to the weighing module, and the weight of the liquid filling cup is borne by the weighing module, and the weighing module is used to weigh the liquid filling cup.

[0013] The battery injection system provided by the embodiment of the present disclosure includes a mounting base, an injection module, and a weighing module. The injection cup includes a pre-installed state and an assembled state. When the injection cup is in the pre-installed state, the injection cup is pre-installed on the tray. At this time, the weight of the injection cup is borne by the tray. When the injection cup is in the assembled state, the injection cup is assembled to the weighing module. At this time, the weight of the injection cup is borne by the weighing module, and the weighing module is used to weigh the injection cup. In other words, by setting a weighing module for weighing the injection cup, that is, the weighing module can weigh the injection cup in real time to obtain the amount of electrolyte injected into the injection cup. There is no need for an injection pump to control the injection amount, and there is no need for de-bubbling, thereby improving the efficiency of liquid preparation. In addition, the electrolyte in the electrolyte room can be directly injected into the injection cup after being filtered by the filter, which simplifies the structure, reduces costs, reduces occupied space, and improves the structural compactness of the injection system.

[0014] In addition, after the liquid filling cup is filled, the real-time weight A2 of the liquid filling cup can be obtained through the weighing module (A2 refers to the weight of the liquid filling cup after the electrolyte is injected, that is, the weight of the liquid filling cup itself and the weight of the electrolyte). After the electrolyte in the liquid filling cup is injected into the battery, the liquid filling cup at this time is weighed to obtain A3 (A3 refers to the weight of the liquid filling cup itself and the weight of the residual electrolyte). That is, the weight of the electrolyte injected into the battery is A2-A3. In other words, the liquid filling method of the embodiment of the present disclosure can eliminate the process of separate weighing of the battery before and after liquid filling, thereby improving production efficiency.

[0015] In some embodiments, the tray includes at least one pre-installed support position, and the filling cup includes at least one pre-installed support portion. When the filling cup is in a pre-installed state, the filling cup is supported on the pre-installed support position by the pre-installed support portion and is located at a first height relative to the tray.

[0016] That is to say, the tray is provided with at least one pre-installed support position, and the liquid filling cup is provided with at least one pre-installed support portion. When the liquid filling cup is in the pre-installed state, the liquid filling cup is supported at the pre-installed support position by the pre-installed support portion to realize the pre-installation of the liquid filling cup.

[0017] In some embodiments, the weighing module includes at least one assembly support position, and the filling cup includes at least one assembly support portion. When the filling cup is in an assembled state, the filling cup is supported on the first assembly support position by the assembly support portion and is located at a second height relative to the tray, and the second height is not equal to the first height.

[0018] That is to say, the weighing module is provided with at least one assembly support position, and the liquid filling cup is provided with at least one assembly support portion. When the liquid filling cup is in the assembled state, the liquid filling cup is supported at the assembly support position by the assembly support portion to realize the assembly of the liquid filling cup.

[0019] In some embodiments, the tray is provided with an air-avoiding area, and the liquid filling cup is passed through the air-avoiding area by the weighing module.

[0020] By providing a clearing area on the tray, the liquid-filling cup, when pre-installed, is placed within the clearing area and supported by the pre-installation support portion at the pre-installation support position, thereby enabling pre-installation of the liquid-filling cup. When the liquid-filling cup is assembled, the assembly support portion supports the liquid-filling cup at the assembly support position, thereby enabling assembly of the liquid-filling cup. For example, the assembly support position cooperates with the assembly support portion to lift the liquid-filling cup, separating the pre-installation support portion from the pre-installation support position, thereby allowing the weight of the liquid-filling cup to be borne by the weighing module.

[0021] In some embodiments, the mounting base is provided with at least one first supporting column, the tray is provided with at least one first supporting hole, and the tray is supported on the first supporting column through the first supporting hole.

[0022] That is to say, the mounting seat is provided with at least one first support column, and the tray is provided with at least one first support hole. The first support hole cooperates with the first support column so that the mounting seat supports the tray. The connection structure is simple and reliable.

[0023] In some embodiments, at least a portion of the outer wall of the liquid filling cup is protruded with a pre-installed support portion. When the liquid filling cup is in a pre-installed state, the liquid filling cup is supported on the upper surface of the tray by the pre-installed support portion and is located at a first height relative to the tray.

[0024] By protruding at least part of the outer wall of the liquid filling cup and providing a pre-installed support portion, when the liquid filling cup is in the pre-installed state, the liquid filling cup is supported on the upper surface of the tray by the pre-installed support portion. The connection structure is simple and reliable, which is conducive to pre-installing the liquid filling cup on the tray and is conducive to switching the liquid filling cup between the pre-installed state and the assembled state.

[0025] In some embodiments, at least one second support hole is provided at the bottom of the liquid filling cup, the weighing module is provided below the tray, and includes at least one second support column; when the liquid filling cup is in an assembled state, the pre-installed support portion is spaced apart from the upper surface of the tray, the liquid filling cup is supported on the second support column through the second support hole, and is located at a second height relative to the tray, and the second height is not equal to the first height.

[0026] At least one second support hole is provided at the bottom of the liquid injection cup, and at least one second support column is provided on the weighing module. When the liquid injection cup is in a pre-installed state, the liquid injection cup is supported on the upper surface of the tray by the pre-installed support portion. During the process of assembling the liquid injection module onto the mounting seat, the second support column on the weighing module contacts the second support hole at the bottom of the liquid injection cup and gradually lifts the liquid injection cup so that the pre-installed support portion of the liquid injection cup gradually moves away from the upper surface of the tray. When the tray is fully supported on the mounting seat, the weighing module fully lifts the liquid injection cup, and the liquid injection cup is disengaged from the tray, that is, the pre-installed support portion is spaced apart from the upper surface of the tray, so that the liquid injection cup can be switched from the pre-installed state on the tray to the assembled state on the weighing module. At this time, the liquid injection cup is located at a second height relative to the tray.

[0027] In some embodiments, the weighing module includes a weighing device and a weighing bracket disposed on the weighing device, the second support column is disposed on the weighing bracket, and the weighing device is used to weigh the liquid filling cup.

[0028] That is to say, by setting the weighing module to include a weighing device and a weighing bracket, the weighing bracket is set on the weighing device, and the weighing bracket is provided with a second support column for contacting the second support hole at the bottom of the filling cup to support the filling cup, and the weighing device is located below the weighing bracket. In this way, when the weighing bracket lifts the filling cup and supports it below the filling cup, the weighing device can weigh the filling cup.

[0029] In some embodiments, the weighing module further includes a mounting plate, and the weighing device is disposed on the mounting plate.

[0030] By providing a mounting plate, the weighing device is arranged on the mounting plate, and the mounting plate is assembled to the mounting seat, thereby facilitating the assembly of the weighing device.

[0031] In some embodiments, the weighing module includes a plurality of weighing units, each of the weighing units includes the weighing device and the weighing bracket, and the injection module includes a plurality of the injection cups, and the injection cups correspond one-to-one to the weighing units.

[0032] By configuring the weighing module to include a plurality of weighing units, and the weighing units corresponding to the liquid filling cups one-to-one, it is possible to weigh the plurality of liquid filling cups simultaneously, thereby improving the liquid preparation effect.

[0033] In some embodiments, the liquid filling module further includes a guide member disposed on the tray for guiding the movement of the liquid filling cup along its height direction.

[0034] It can be understood that when the liquid filling cup is switched from the pre-installed state on the tray to the assembled state on the weighing module, the liquid filling cup moves along its height direction. By setting a guide member to guide the movement of the liquid filling cup along its height direction, the liquid filling cup can be prevented from being offset during the lifting process, thereby improving the reliability of the movement process of the liquid filling cup.

[0035] In some embodiments, the guide member is a guide bracket, and a guide groove is defined between the guide bracket and the upper surface of the tray. The top wall of the guide groove is provided with a guide column extending toward the upper surface of the tray. A guide hole is provided on the pre-installed support portion, and the guide column slides with the guide hole to guide the movement of the filling cup along its height direction.

[0036] By providing a guide bracket with a guide column and providing a guide hole on the pre-installed support part, the guide column and the guide hole are slidably matched to guide the movement of the filling cup along its height direction, which can prevent the filling cup from shifting during the lifting process. In addition, the guide bracket can also limit the filling cup, which can prevent the filling cup from completely detaching from the tray to a certain extent.

[0037] A second aspect of the embodiments of the present disclosure provides a battery injection method, which is applied to the battery injection system described above, wherein the injection module further includes an injection device and a valve opening device provided on the injection cup, wherein the valve opening device has an open state and a closed state;

[0038] The liquid injection method includes a liquid preparation step, and the liquid preparation step includes:

[0039] Obtaining the initial weight A1 of the liquid filling cup through a weighing module;

[0040] Opening the injection valve of the injection device and injecting electrolyte into the injection cup;

[0041] Obtaining the real-time weight A2 of the liquid filling cup through the weighing module;

[0042] By comparing A2-A1 with the target weight A0, confirm whether the liquid preparation requirements are met;

[0043] If the liquid preparation requirements are met, the liquid preparation is completed.

[0044] During the process of preparing liquid for the injection cup, the weighing module and the injection module are first assembled to the mounting seat, and the injection cup is switched from the pre-installed state to the assembled state. The weight of the injection cup is carried by the weighing module, and the weighing module is used to weigh the injection cup. The weighing module obtains the initial weight A1 of each injection cup (that is, the weight of each injection cup before injection). After weighing, the system records the initial weight A1 of each injection cup, opens the injection valve of the injection device, and injects electrolyte into the injection cup. The real-time weight A2 of the injection cup is obtained through the weighing module, and the system compares A2-A1 with the target weight A0 to confirm whether the liquid preparation requirements are met. If the liquid preparation requirements are met, the liquid preparation is completed. In other words, by setting up a weighing module to weigh the injection cup, the injection amount of the electrolyte in the injection cup can be determined. There is no need for an injection pump to control the injection amount, and there is no need for de-bubbling, thereby improving the liquid preparation efficiency. Furthermore, after being filtered through a filter, the electrolyte in the electrolyte chamber can be directly injected into the injection cup, simplifying the structure, reducing costs, reducing space requirements, and improving the structural compactness of the injection system. This injection method's preparation steps are highly efficient, and the injection cup remains relatively sealed from the outside world until the normally closed valve mechanism is unlocked, ensuring that electrolyte does not leak during injection and weighing. Furthermore, the injection and weighing process can be completed while the battery pack is being assembled, improving production cycle time.

[0045] In addition, after the liquid filling cup is filled, the real-time weight A2 of the liquid filling cup can be obtained through the weighing module (A2 refers to the weight of the liquid filling cup after the electrolyte is injected, that is, the weight of the liquid filling cup itself and the weight of the electrolyte). After the electrolyte in the liquid filling cup is injected into the battery, the liquid filling cup at this time is weighed to obtain A3 (A3 refers to the weight of the liquid filling cup itself and the weight of the residual electrolyte). That is, the weight of the electrolyte injected into the battery is A2-A3. In other words, the liquid filling method of the embodiment of the present disclosure can eliminate the process of separate weighing of the battery before and after liquid filling, thereby improving production efficiency.

[0046] In some embodiments, the step of comparing A2-A1 with the target weight A0 to determine whether the liquid preparation requirement is met includes:

[0047] If A2-A1≥A0, it is confirmed that the liquid preparation requirements are met;

[0048] If A2-A1<A0, it is determined that the liquid preparation requirement is not met, and the electrolyte continues to be injected into the liquid injection cup.

[0049] That is, if the weight A2-A1 of the electrolyte injected into the injection cup is greater than or equal to the target weight A0, that is, the electrolyte stored in the injection cup is sufficient to meet the amount of electrolyte required to be injected into the battery, and this indicates that the electrolyte reserve requirement is met. Conversely, if the weight A2-A1 of the electrolyte injected into the injection cup is less than the target weight A0, that is, the electrolyte stored in the injection cup does not meet the amount of electrolyte required to be injected into the battery, this indicates that the electrolyte reserve requirement is not met, and electrolyte continues to be injected into the injection cup until the electrolyte reserve requirement is met.

[0050] In some embodiments, if A2-A1≥A0, confirming that the liquid preparation requirement is met includes:

[0051] Based on the electrolyte flow rate q of the injection device and the reaction time t of the injection valve, it is determined whether to close the injection valve.

[0052] The embodiment of the present disclosure determines whether to close the injection valve based on the electrolyte flow rate q of the injection device and the reaction time t of the injection valve. That is, the amount of electrolyte injected by the injection valve within the reaction time is calculated, and the injection valve is closed in advance, thereby improving the accuracy of the preparation liquid.

[0053] In some embodiments, determining whether to close the injection valve based on the electrolyte flow rate q of the injection device and the reaction time t of the injection valve includes:

[0054] If A2-A1+qt≥A0, close the injection valve;

[0055] If A2-A1+qt<A0, the injection valve is opened and the electrolyte is continuously injected into the injection cup.

[0056] The electrolyte flow rate q of the injection device is obtained through experiments, and the reaction time t of the injection valve is measured at the same time. It is calculated that under normal flow, the injection amount of electrolyte in the closing reaction time t of the injection valve is qt, that is, the corrected target injection amount is the original target injection amount - the injection amount of electrolyte in the closing reaction time t of the injection valve, that is, A2-A1+qt≥A0. If A2-A1+qt<A0, it means that the preparation liquid demand is not met. In this case, the injection valve is opened and the electrolyte is continuously injected into the injection cup until the preparation liquid demand is met, thereby improving the accuracy of the preparation liquid.

[0057] In some embodiments, the battery includes a switch valve having an open state and a closed state, the liquid injection system further includes a vacuum pumping module independent of the liquid injection module, and the liquid injection method further includes a vacuum pumping step. The liquid preparation step is performed before the vacuum pumping step, or simultaneously with the vacuum pumping step. The vacuum pumping step includes:

[0058] Connecting the vacuum pipe of the vacuum module to the switch valve to open the switch valve;

[0059] Controlling the vacuum device of the vacuum module to vacuum the battery;

[0060] After confirming that the vacuuming is completed, the vacuuming pipe is separated from the switch valve to put the switch valve in a closed state.

[0061] During vacuuming, the vacuuming pipe of the vacuuming module is connected to the switch valve to open the switch valve, and the vacuuming device of the vacuuming module is controlled to vacuum the battery. After confirming that the vacuuming is completed, the vacuuming pipe is separated from the switch valve to close the switch valve. At this time, the vacuuming step is completed. The liquid injection system also includes a vacuuming module that is independent of the liquid injection module. In this way, the vacuuming pipeline of the vacuuming module and the liquid injection pipeline of the liquid injection module do not need to be shared, which avoids the residual electrolyte in the pipeline from diffusing to other pipelines and valve bodies of the vacuuming module during the vacuuming process, causing the pipelines and valve bodies to be blocked. The liquid preparation step is performed before the vacuuming step, or at the same time as the vacuuming step. In this way, the electrolyte can be injected into the liquid injection cup in advance at any time before the battery and the liquid injection cup are combined, reducing the serial time (liquid preparation time) to improve production efficiency.

[0062] In some embodiments, the liquid injection method further includes a liquid injection step after the vacuuming step and the liquid preparation step, and the liquid injection step includes:

[0063] Connecting the valve opening device to the switch valve so that both the valve opening device and the switch valve are in an open state;

[0064] Controlling the liquid injection module to inject liquid into the battery;

[0065] After confirming that the liquid injection is completed, the valve opening device is separated from the switch valve so that both the valve opening device and the switch valve are in a closed state.

[0066] During liquid injection, the lifting system brings the valve opening device of the liquid injection cup into contact with the switch valve of the battery (for example, controlling the liquid injection cup tray to move toward the battery, or controlling the battery tray to move toward the liquid injection cup). First, the valve opening device of the liquid injection cup contacts the switch valve of the battery. The liquid injection channel formed after the contact remains sealed from the external environment. Due to the interaction force between the valve opening device and the switch valve, the switch valve is forced to open. At the same time, the valve opening device is also opened by the interaction force. At this time, the valve opening device and the switch valve are both in the open state, and the liquid injection module is controlled to inject liquid into the battery. After confirming that the liquid injection is completed, the valve opening device is separated from the switch valve so that the valve opening device and the switch valve are both in the closed state.

[0067] The battery injection system provided by the embodiment of the present disclosure includes a mounting base, an injection module and a weighing module. The injection cup includes a pre-installed state and an assembled state. When the injection cup is in the pre-installed state, the injection cup is pre-installed on the tray. At this time, the weight of the injection cup is borne by the tray. When the injection cup is in the assembled state, the injection cup is assembled to the weighing module. At this time, the weight of the injection cup is borne by the weighing module. The weighing module is used to weigh the injection cup. By setting a weighing module for weighing the injection cup, that is, the weighing module can weigh the injection cup in real time to obtain the amount of electrolyte injected into the injection cup. There is no need for an injection pump to control the injection amount, and there is no need for de-bubbling action, thereby improving the efficiency of liquid preparation. In addition, the electrolyte in the electrolyte room can be directly injected into the injection cup after being filtered by the filter, which simplifies the structure, reduces costs, reduces occupied space, and improves the structural compactness of the injection system.

[0068] In addition, after the liquid filling cup is filled, the real-time weight A2 of the liquid filling cup can be obtained through the weighing module (A2 refers to the weight of the liquid filling cup after the electrolyte is injected, that is, the weight of the liquid filling cup itself and the weight of the electrolyte). After the electrolyte in the liquid filling cup is injected into the battery, the liquid filling cup at this time is weighed to obtain A3 (A3 refers to the weight of the liquid filling cup itself and the weight of the residual electrolyte). That is, the weight of the electrolyte injected into the battery is A2-A3. In other words, the liquid filling method of the embodiment of the present disclosure can eliminate the process of separate weighing of the battery before and after liquid filling, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] FIG1 is a schematic structural diagram of a battery liquid injection system from a first perspective according to an embodiment of the present disclosure, wherein the liquid injection cup is in an assembled state;

[0070] FIG2 is a schematic structural diagram of a battery liquid injection system according to an embodiment of the present disclosure from a second perspective, wherein the liquid injection cup is in a pre-installed state;

[0071] FIG3 is an exploded view of FIG1 ;

[0072] FIG4 is a schematic structural diagram of a battery liquid injection system according to an embodiment of the present disclosure from a third perspective, wherein the liquid injection cup is in a pre-installed state;

[0073] Figure 5 is an enlarged view of point A in Figure 4;

[0074] FIG6 is a schematic structural diagram of a battery liquid injection system according to an embodiment of the present disclosure from a fourth perspective, wherein the liquid injection cup is in an assembled state;

[0075] FIG7 is a schematic flow chart of a liquid preparation step according to an embodiment of the present disclosure.

[0076] Explanation of the accompanying drawings: 1. Mounting seat; 1a. First support column; 2. Liquid injection module; 21. Tray; 21a. Air avoidance area; 21b. First support hole; 22. Liquid injection cup; 22a. Pre-installed support part; 22b. Second support hole; 22c. Guide hole; 3. Weighing module; 31. Weighing unit; 311. Scale; 312. Weighing bracket; 312a. Second support column; 32. Mounting plate; 4. Guide member; 4a. Guide column. DETAILED DESCRIPTION

[0077] It should be noted that, unless there is a conflict, the embodiments and technical features in the embodiments of the present disclosure can be combined with each other, and the detailed description in the specific implementation methods should be understood as an explanation of the purpose of the present disclosure and should not be regarded as an improper limitation on the present disclosure.

[0078] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this disclosure belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this disclosure; the terms "including" and "having" and any variations thereof in this disclosure are intended to cover non-exclusive inclusions.

[0079] In the description of the embodiments of the present disclosure, technical terms such as "first," "second," and "third" are used solely to distinguish different objects and should not be understood to indicate or imply relative importance or to implicitly specify the quantity, specific order, or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present disclosure, "plurality" means more than two, unless otherwise specifically defined.

[0080] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present disclosure. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0081] In the description of the embodiments of the present disclosure, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0082] In the description of the embodiments of the present disclosure, the orientations or positional relationships indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "circumferential", "height direction", "first direction", and "second direction" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present disclosure.

[0083] In the description of the embodiments of the present disclosure, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal connectivity between two components or interaction between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present disclosure based on specific circumstances.

[0084] In the description of the embodiments of the present disclosure, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact, contact through an intermediate medium layer, contact with essentially no interaction force between the two contacting parties, or contact with interaction force between the two contacting parties.

[0085] With the development of clean energy, more and more devices are using electricity as a driving force. Consequently, power batteries, such as lithium-ion batteries, that can store large amounts of electricity and undergo multiple charge and discharge cycles are rapidly developing. These batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in aerospace and other fields.

[0086] The battery referred to in the embodiments of this disclosure refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this disclosure may include a battery module or a battery pack. Batteries generally include a housing for enclosing one or more battery cells. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0087] In the present disclosure, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, and the present disclosure is not limited thereto. Battery cells may be cylindrical, rectangular, or in other shapes, and the present disclosure is not limited thereto.

[0088] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive electrode collector. The uncoated positive electrode collector protrudes from the coated positive electrode collector, and the uncoated positive electrode collector serves as the positive electrode tab. For lithium-ion batteries, for example, the positive electrode current collector can be made of aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative electrode collector. The uncoated negative electrode collector protrudes from the coated negative electrode collector, and the uncoated negative electrode collector serves as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon. To ensure high current flow without melting, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene).

[0089] A battery cell also includes an insulating film and a casing. The insulating film is applied to the outside of the electrode assembly, and the casing encapsulates the electrode assembly coated with the insulating film to form a battery cell. The insulating film can be Mylar film, and the casing can be aluminum. After the electrode assembly is wound, the Mylar film and casing are encapsulated through the Mylar wrapping process and the casing insertion process. The Mylar film seals and protects the electrode assembly, effectively insulating the electrode assembly and casing from each other, preventing internal short circuits in the battery cell. The casing also provides protection.

[0090] The injection process is an important step in the battery manufacturing process. The injection accuracy is directly related to the cycle performance and consistency of lithium ions.

[0091] In the related art, a liquid storage tank is required to store the electrolyte transported from the electrolyte room. The injection pump pumps the electrolyte in the liquid storage tank into the containing device in a quantitative manner. After the battery is vacuumed, the injection valve of the containing device is opened, and the electrolyte in the containing device is injected into the injection cup. After the electrolyte is injected into the injection cup, the injection valve is closed, and the battery and the injection cup are combined and transported to the next process. It can be seen that each injection cup requires a corresponding injection pump, and a liquid storage tank and a containing device are required to store the electrolyte transported from the electrolyte room, which takes up space and increases equipment costs. In addition, the injection amount of the electrolyte is controlled by the injection pump. The bubbles in the electrolyte will reduce the control accuracy of the electrolyte injection amount. The electrolyte also needs to be de-bubbled and filtered for impurities, which reduces the liquid preparation efficiency.

[0092] In order to improve the efficiency of liquid preparation, reduce costs and reduce occupied space, please refer to Figures 1 to 6. An embodiment of the present disclosure provides a battery liquid injection system, which includes a mounting base 1, a liquid injection module 2 and a weighing module 3. The liquid injection module 2 includes a tray 21 and a liquid injection cup 22. The weighing module 3 is arranged on the mounting base 1. Among them, the liquid injection cup 22 includes a pre-installed state and an assembled state. When the liquid injection cup 22 is in the pre-installed state, the liquid injection cup 22 is pre-installed on the tray 21. The weight of the liquid injection cup 22 is borne by the tray 21. When the liquid injection cup 22 is in the assembled state, the liquid injection cup 22 is assembled to the weighing module 3. The weight of the liquid injection cup 22 is borne by the weighing module 3. The weighing module 3 is used to weigh the liquid injection cup 22.

[0093] The specific structure of the mounting base 1 is not limited here. The mounting base 1 is a main supporting structure for supporting and mounting the liquid injection module 2 and the weighing module 3 .

[0094] For example, the mounting base 1 is a marble platform. By setting the mounting base 1 as a marble platform, a better vibration reduction effect is achieved, the influence of environmental vibration on the liquid injection system is avoided, and the reliability of the liquid injection system is improved.

[0095] The weighing module 3 is arranged on the mounting base 1, corresponding to the liquid filling cup 22 one by one, and is used to weigh the liquid filling cup 22. In other words, the weighing module 3 can weigh the liquid filling cup 22 in real time to obtain the electrolyte injection amount in the liquid filling cup 22.

[0096] The liquid injection module 2 is used to inject liquid into the battery.

[0097] The liquid filling module 2 includes a tray 21 and a liquid filling cup 22 . The tray 21 is used to carry the liquid filling cup 22 .

[0098] It should be noted that the number of the liquid injection cups 22 is not limited here, for example, it can be one or more.

[0099] The multiple mentioned in the embodiments of the present disclosure refers to a number of two or more.

[0100] Exemplarily, there are multiple liquid-filling cups 22 , and when the liquid-filling cups 22 are in a pre-installed state, the multiple liquid-filling cups 22 are carried on the tray 21 .

[0101] When the filling cup 22 is in a pre-installed state, the filling cup 22 is pre-installed on the tray 21, and the weight of the filling cup 22 is borne by the tray 21. At this time, the filling module 2 is not assembled to the mounting base 1. By placing all the filling cups 22 on the tray 21, it is convenient to transfer the filling cups 22.

[0102] After the injection module 2 is assembled to the mounting base 1, the injection cup 22 is switched from the pre-assembled state to the assembled state. At this time, the injection cup 22 is assembled to the weighing module 3. The weight of the injection cup 22 is borne by the weighing module 3, and the weighing module 3 is used to weigh the injection cup 22. Therefore, the initial weight of the injection cup 22 (the initial weight refers to the weight before the electrolyte is injected, that is, the weight of the injection cup 22 itself) can be weighed by the weighing module 3. After the injection device injects the electrolyte into the injection cup 22, the real-time weight of the injection cup 22 (the real-time weight refers to the weight of the injection cup 22 after the electrolyte is injected, that is, the weight of the injection cup 22 itself and the weight of the electrolyte) can be weighed by the weighing module 3 to obtain the weight of the electrolyte injected into the injection cup 22.

[0103] It is understandable that the electrolyte injection volume is controlled by weighing the electrolyte by the weighing module 3, eliminating the need for an injection pump to control the injection volume, thereby eliminating the need for bubble removal and improving the efficiency of liquid preparation. Furthermore, since bubble removal is not required, the electrolyte in the electrolyte room can be directly injected into the injection cup 22 after being filtered by the filter, and controlled by the injection valve (an injection valve is provided on the electrolyte delivery pipeline to control the electrolyte on and off). This simplifies the original injection station structure (injection pump, storage device, pipeline and valve body), reduces the occupied space, reduces equipment costs, reduces equipment size, and simplifies the equipment piping structure.

[0104] Exemplarily, the liquid injection system includes a valve opening device, which includes an open state and a closed state. The valve opening device is a normally closed valve opening device. In this way, electrolyte can be injected into the liquid injection cup 22 in advance at any time before the battery and the liquid injection cup 22 are combined, which can reduce the serial time (liquid preparation time) and improve production efficiency and production rhythm. In other words, before the normally closed valve opening device is unlocked, the liquid injection cup 22 remains relatively sealed from the outside world, ensuring that the electrolyte does not leak during the liquid injection and weighing. At the same time, the liquid injection and weighing action can be completed when the battery pack is assembled, thereby improving the production rhythm.

[0105] The battery injection system provided by the embodiment of the present disclosure includes a mounting base 1, an injection module 2, and a weighing module 3. The injection cup 22 includes a pre-installed state and an assembled state. When the injection cup 22 is in the pre-installed state, the injection cup 22 is pre-installed on the tray 21. At this time, the weight of the injection cup 22 is borne by the tray 21. When the injection cup 22 is in the assembled state, the injection cup 22 is assembled to the weighing module 3. At this time, the weight of the injection cup 22 is borne by the weighing module 3. The weighing module 3 is used to weigh the injection cup 22. That is, by setting the weighing module 3 for weighing the injection cup 22, that is, the weighing module 3 can weigh the injection cup 22 in real time to obtain the amount of electrolyte injected into the injection cup 22. There is no need for an injection pump to control the injection amount, and there is no need for debubbling, thereby improving the liquid preparation efficiency. In addition, the electrolyte in the electrolyte room can be directly injected into the injection cup 22 after being filtered by the filter, which simplifies the structure, reduces the cost, reduces the occupied space, and improves the structural compactness of the injection system.

[0106] In addition, after the filling cup 22 is filled, the real-time weight A2 of the filling cup 22 can be obtained by the weighing module 3 (A2 refers to the weight of the filling cup 22 after the electrolyte is injected, that is, the weight of the filling cup 22 itself and the weight of the electrolyte). After the electrolyte in the filling cup 22 is injected into the battery, the filling cup 22 at this time is weighed to obtain A3 (A3 refers to the weight of the filling cup 22 itself and the weight of the residual electrolyte), that is, the weight of the electrolyte injected into the battery is A2-A3. In other words, the filling method of the embodiment of the present disclosure can eliminate the process of separate weighing before and after battery filling, thereby improving production efficiency.

[0107] In some embodiments, referring to Figures 1 to 6 , the tray 21 includes at least one pre-installed support position, and the liquid filling cup 22 includes at least one pre-installed support portion 22a. When the liquid filling cup 22 is in the pre-installed state, the liquid filling cup 22 is supported by the pre-installed support portion 22a at the pre-installed support position and is located at a first height relative to the tray 21.

[0108] The tray 21 includes at least one pre-installed support position, which means that the number of pre-installed support positions can be one or more.

[0109] The liquid filling cup 22 includes at least one pre-installed support portion 22 a , which means that the number of the pre-installed support portions 22 a can be one or more.

[0110] That is to say, the tray 21 is provided with at least one pre-installed support position, and the liquid filling cup 22 is provided with at least one pre-installed support portion 22a. When the liquid filling cup 22 is in the pre-installed state, the liquid filling cup 22 is supported at the pre-installed support position by the pre-installed support portion 22a to realize the pre-installation of the liquid filling cup 22.

[0111] In some embodiments, referring to Figures 1 to 6 , the weighing module 3 includes at least one assembly support position, and the liquid filling cup 22 includes at least one assembly support portion. When the liquid filling cup 22 is assembled, the liquid filling cup 22 is supported by the assembly support portion at a first assembly support position and is positioned at a second height relative to the tray 21. The second height is different from the first height.

[0112] The weighing module 3 includes at least one assembly support position, which means that the number of the assembly support positions can be one or more.

[0113] The liquid filling cup 22 includes at least one assembly support portion, which means that the number of the assembly support portions can be one or more.

[0114] That is to say, the weighing module 3 is provided with at least one assembly support position, and the liquid filling cup 22 is provided with at least one assembly support portion. When the liquid filling cup 22 is in the assembly state, the liquid filling cup 22 is supported at the assembly support position by the assembly support portion to realize the assembly of the liquid filling cup 22.

[0115] The second height is not equal to the first height, that is, the height of the liquid filling cup 22 relative to the tray 21 is different in the pre-installed state and in the assembled state, which helps to achieve the switching of the liquid filling cup 22 between the pre-installed state and the assembled state.

[0116] In some embodiments, referring to FIG. 3 , the tray 21 is provided with an airtight area 21 a , and the liquid filling cup 22 is passed through the airtight area 21 a through the weighing module 3 .

[0117] The specific structural form of the air-avoiding area 21 a is not limited here, as long as the liquid-filling cup 22 can pass through the air-avoiding area 21 a.

[0118] By providing a clearing area 21a on the tray 21, the liquid-filling cup 22 is placed in the clearing area 21a when pre-installed and supported by the pre-installation support portion 22a at the pre-installation support position, thereby enabling pre-installation of the liquid-filling cup 22. When the liquid-filling cup 22 is in the assembly state, the liquid-filling cup 22 is supported by the assembly support portion at the assembly support position, thereby enabling assembly of the liquid-filling cup 22. For example, the assembly support position cooperates with the assembly support portion to lift the liquid-filling cup 22, separating the pre-installation support portion 22a from the pre-installation support position, thereby allowing the weight of the liquid-filling cup 22 to be borne by the weighing module 3.

[0119] In some embodiments, referring to FIG. 1 and FIG. 3 , the mounting base 1 is provided with at least one first support column 1 a , the tray 21 is provided with at least one first support hole 21 b , and the tray 21 is supported on the first support column 1 a through the first support hole 21 b .

[0120] The installation base 1 is provided with at least one first support column 1 a , which means that the number of the first support columns 1 a can be one or more.

[0121] Specifically, the mounting base 1 is a rectangular marble platform. There are four first support columns 1 a , which are respectively arranged at the four corners of the marble platform to improve the support reliability of the mounting base 1 .

[0122] The tray 21 is provided with at least one first supporting hole 21 b, which means that the number of the first supporting hole 21 b can be one or more.

[0123] Specifically, the tray 21 is also rectangular. There are four first support holes 21b, which are respectively provided at the four corners of the tray 21 and correspond to the first support columns 1a on the tray 21, thereby improving the reliability of the connection structure between the mounting base 1 and the tray 21.

[0124] That is to say, the mounting base 1 is provided with at least one first support column 1a, and the tray 21 is provided with at least one first support hole 21b. The first support hole 21b cooperates with the first support column 1a so that the mounting base 1 supports the tray 21. The connection structure is simple and reliable.

[0125] It should be noted that the specific structures of the pre-installed support portion 22a and the pre-installed support position are not limited here.

[0126] In some embodiments, referring to Figures 3 and 5 , a pre-installation support portion 22a is protruding from at least a portion of the outer wall of the liquid filling cup 22. When the liquid filling cup 22 is in the pre-installed state, the liquid filling cup 22 is supported on the upper surface of the tray 21 by the pre-installation support portion 22a and is located at a first height relative to the tray 21.

[0127] At least part of the outer wall of the liquid filling cup 22 is protruding with a pre-installed support part 22a, which means that part of the outer wall of the liquid filling cup 22 can be protruding with the pre-installed support part 22a, as long as the liquid filling cup 22 can be supported on the upper surface of the tray 21 by the pre-installed support part 22a of the outer wall. It can also be that the entire outer wall of the liquid filling cup 22 is protruding with the pre-installed support part 22a, that is, a circle of pre-installed support part 22a is arranged around the outer wall of the liquid filling cup 22.

[0128] The liquid pouring cup 22 is supported on the upper surface of the tray 21 by the pre-installed support portion 22 a , that is, the liquid pouring cup 22 is supported on the edge of the clearance area 21 a of the tray 21 by the pre-installed support portion 22 a .

[0129] By protruding at least part of the outer wall of the liquid filling cup 22 and providing a pre-installed support portion 22a, when the liquid filling cup 22 is in the pre-installed state, the liquid filling cup 22 is supported on the upper surface of the tray 21 by the pre-installed support portion 22a. The connection structure is simple and reliable, which is conducive to pre-installing the liquid filling cup 22 on the tray 21, and is conducive to switching the liquid filling cup 22 between the pre-installed state and the assembled state.

[0130] In some embodiments, as shown in Figures 3 to 6 , the bottom of the liquid filling cup 22 is provided with at least one second support hole 22b. The weighing module 3 is positioned below the tray 21 and includes at least one second support column 312a. When the liquid filling cup 22 is assembled, the pre-installed support portion 22a is spaced apart from the upper surface of the tray 21. The liquid filling cup 22 is supported by the second support column 312a through the second support hole 22b and is positioned at a second height relative to the tray 21. This second height is not equal to the first height.

[0131] The bottom of the liquid-filling cup 22 is provided with at least one second supporting hole 22 b , which means that the number of the second supporting hole 22 b can be one or more.

[0132] The weighing module 3 is arranged below the tray 21 , that is, the weighing module 3 is arranged between the tray 21 and the mounting base 1 , which is conducive to weighing the weight of the liquid filling cup 22 .

[0133] The weighing module 3 includes at least one second supporting column 312 a, which means that the number of the second supporting column 312 a can be one or more.

[0134] At least one second support hole 22b is provided at the bottom of the liquid-filling cup 22, and at least one second support column 312a is provided at the weighing module 3. When the liquid-filling cup 22 is in the pre-installed state, the liquid-filling cup 22 is supported on the upper surface of the tray 21 by the pre-installed support portion 22a. During the process of assembling the liquid-filling module 2 onto the mounting base 1, the second support column 312a on the weighing module 3 contacts the second support hole 22b at the bottom of the liquid-filling cup 22 and gradually lifts the liquid-filling cup 22, causing the pre-installed support portion 22a of the liquid-filling cup 22 to gradually move away from the upper surface of the tray 21. When the tray 21 is fully supported on the mounting base 1, the weighing module 3 fully lifts the liquid-filling cup 22, and the liquid-filling cup 22 is disengaged from the tray 21. That is, the pre-installed support portion 22a is spaced apart from the upper surface of the tray 21, thereby enabling the liquid-filling cup 22 to switch from the pre-installed state on the tray 21 to the assembled state on the weighing module 3. At this time, the liquid-filling cup 22 is located at the second height relative to the tray 21.

[0135] It should be noted that the specific structure of the weighing module 3 is not limited here, as long as it can weigh the liquid filling cup 22.

[0136] 3 and 4 , the weighing module 3 includes a weighing device 311 and a weighing bracket 312 disposed on the weighing device 311. A second support column 312a is disposed on the weighing bracket 312. The weighing device 311 is used to weigh the liquid filling cup 22.

[0137] The specific type of the weighing device 311 is not limited here, as long as it can weigh the liquid injection cup 22. Exemplarily, the weighing device 311 is an electronic scale.

[0138] That is to say, by setting the weighing module 3 to include a weighing device 311 and a weighing bracket 312, the weighing bracket 312 is set on the weighing device 311, and the weighing bracket 312 is provided with a second support column 312a for contacting the second support hole 22b at the bottom of the liquid filling cup 22 to support the liquid filling cup 22, and the weighing device 311 is located below the weighing bracket 312. In this way, when the weighing bracket 312 lifts the liquid filling cup 22 and supports it below the liquid filling cup 22, the weighing device 311 can weigh the liquid filling cup 22.

[0139] In some embodiments, referring to FIG. 3 and FIG. 4 , the weighing module 3 further includes a mounting plate 32 , and the weighing device 311 is disposed on the mounting plate 32 .

[0140] By providing the mounting plate 32 , the weighing device 311 is provided on the mounting plate 32 , and the mounting plate 32 is assembled to the mounting seat 1 , thereby facilitating the assembly of the weighing device 311 .

[0141] In some embodiments, referring to Figures 2 to 4 , the weighing module 3 includes a plurality of weighing units 31. Each weighing unit 31 includes a weighing device 311 and a weighing bracket 312. The liquid injection module 2 includes a plurality of liquid injection cups 22, and the liquid injection cups 22 correspond to the weighing units 31 on a one-to-one basis.

[0142] The weighing module 3 includes a plurality of weighing units 31 , which is conducive to weighing each liquid filling cup 22 at the same time.

[0143] The number of weighing units 31 corresponds to the number of liquid filling cups 22 , that is, the liquid filling cups 22 correspond to the weighing units 31 on a one-to-one basis.

[0144] By configuring the weighing module 3 to include a plurality of weighing units 31 , and the weighing units 31 corresponding to the liquid filling cups 22 one by one, it is possible to weigh the plurality of liquid filling cups 22 simultaneously, thereby improving the liquid preparation effect.

[0145] In some embodiments, referring to Figures 2 to 4 , the liquid injection module 2 further includes a guide member 4 disposed on the tray 21 for guiding the movement of the liquid injection cup 22 along its height direction.

[0146] It can be understood that when the liquid filling cup 22 is switched from the pre-installed state on the tray 21 to the assembled state on the weighing module 3, the liquid filling cup 22 moves along its height direction. By setting the guide member 4, the movement of the liquid filling cup 22 along its height direction is guided, which can prevent the liquid filling cup 22 from being offset during the lifting process, thereby improving the reliability of the movement process of the liquid filling cup 22.

[0147] It should be noted that the specific structure of the guide member 4 is not limited here.

[0148] In some embodiments, referring to Figures 2 to 4 , the guide member 4 is a guide bracket. A guide groove is defined between the guide bracket and the upper surface of the tray 21. A guide post 4a is disposed on the top wall of the guide groove, extending toward the upper surface of the tray 21. A guide hole 22c is provided in the pre-installed support portion 22a. The guide post 4a slidably engages with the guide hole 22c to guide the movement of the liquid filling cup 22 along its height.

[0149] A guide groove is defined between the guide bracket and the upper surface of the tray 21. The pre-installed support portion 22a of the liquid filling cup 22 is disposed in the guide groove and moves within the guide groove. In this way, the guide bracket can limit the liquid filling cup 22 and, to a certain extent, prevent the liquid filling cup 22 from completely separating from the tray 21.

[0150] The top wall of the guide groove is provided with a guide post 4 a extending toward the upper surface of the tray 21 , that is, the guide post 4 a extends along the height direction of the liquid filling cup 22 .

[0151] A guide hole 22c is provided on the pre-installed support portion 22a, and the guide column 4a is slidably matched with the guide hole 22c. That is, the guide bracket guides the pre-installed support portion 22a to guide the liquid injection cup 22.

[0152] The number of guide brackets is not limited here, and the number of guide brackets can be one or more. For example, the number of guide brackets is two, and the two guide brackets are respectively located on both sides of the liquid injection cup 22 along the width direction.

[0153] By setting a guide bracket with a guide column 4a and providing a guide hole 22c on the pre-installed support part 22a, the guide column 4a and the guide hole 22c can be slidably matched to guide the movement of the filling cup 22 along its height direction, thereby preventing the filling cup 22 from being offset during the lifting process. In addition, the guide bracket can also limit the filling cup 22, and to a certain extent prevent the filling cup 22 from completely separating from the tray 21.

[0154] The second aspect of the embodiment of the present disclosure also provides a battery injection method, which is applied to the battery injection system of any embodiment of the present disclosure. The injection module 2 also includes an injection device and a valve opening device arranged on the injection cup 22, and the valve opening device has an open state and a closed state.

[0155] The liquid injection method includes a liquid preparation step. Please refer to FIG7 . The liquid preparation step includes:

[0156] Step S100: obtaining the initial weight A1 of the liquid filling cup through the weighing module;

[0157] Step S200: opening the injection valve of the injection device and injecting electrolyte into the injection cup;

[0158] Step S300: obtaining the real-time weight A2 of the liquid filling cup through the weighing module;

[0159] Step S400: By comparing A2-A1 with the target weight A0, confirm whether the liquid preparation requirement is met;

[0160] Step S500: If the liquid preparation requirements are met, the liquid preparation is completed.

[0161] It should be noted that the liquid preparation step refers to injecting electrolyte into the liquid injection cup 22 for standby use.

[0162] Exemplarily, the liquid injection system includes a valve opening device provided on the liquid injection cup 22 , and the valve opening device is provided at the bottom of the liquid injection cup 22 .

[0163] The valve opening device includes an open state and a closed state. When the valve opening device is in the open state, the bottom of the liquid filling cup 22 can be connected to the outside through the valve opening device. When the valve opening device is in the closed state, the bottom of the liquid filling cup 22 is not connected to the outside. In other words, the valve opening device is a normally closed valve opening device. In this way, the electrolyte can be injected into the liquid filling cup 22 in advance at any time before the battery and the liquid filling cup 22 are combined, which can reduce the serial time (liquid preparation time) and improve production efficiency and production rhythm. In other words, before the normally closed valve opening device is unlocked, the liquid filling cup 22 remains relatively sealed from the outside world to ensure that the electrolyte does not leak during the liquid filling and weighing. At the same time, the liquid filling and weighing action can be completed when the battery pack is assembled, thereby improving the production rhythm.

[0164] The liquid injection system of the battery provided in the embodiment of the present disclosure includes a mounting seat 1, a liquid injection module 2 and a weighing module 3. The liquid injection module 2 includes a tray 21 and a liquid injection cup 22. The weighing module 3 is arranged on the mounting seat 1. The liquid injection cup 22 includes a pre-installed state and an assembled state. When the liquid injection cup 22 is in the pre-installed state, the liquid injection cup 22 is pre-installed on the tray 21. The weight of the liquid injection cup 22 is borne by the tray 21. When the liquid injection cup 22 is in the assembled state, the liquid injection cup 22 is assembled to the weighing module 3. The weight of the liquid injection cup 22 is borne by the weighing module 3. The weighing module 3 is used to weigh the liquid injection cup 22.

[0165] When the filling cup 22 is in a pre-installed state, the filling cup 22 is pre-installed on the tray 21, and the weight of the filling cup 22 is borne by the tray 21. At this time, the filling module 2 is not assembled to the mounting base 1. By placing all the filling cups 22 on the tray 21, it is convenient to transfer the filling cups 22.

[0166] After the injection module 2 is assembled to the mounting base 1, the injection cup 22 is switched from the pre-assembled state to the assembled state. At this time, the injection cup 22 is assembled to the weighing module 3. The weight of the injection cup 22 is borne by the weighing module 3, and the weighing module 3 is used to weigh the injection cup 22. Therefore, the initial weight of the injection cup 22 (the initial weight refers to the weight before the electrolyte is injected, that is, the weight of the injection cup 22 itself) can be weighed by the weighing module 3. After the injection device injects the electrolyte into the injection cup 22, the real-time weight of the injection cup 22 (the real-time weight refers to the weight of the injection cup 22 after the electrolyte is injected, that is, the weight of the injection cup 22 itself and the weight of the electrolyte) can be weighed by the weighing module 3 to obtain the weight of the electrolyte injected into the injection cup 22.

[0167] It is understood that the electrolyte injection volume is controlled by weighing the electrolyte using the weighing module 3, eliminating the need for an injection pump to control the injection volume. This eliminates the need for bubble removal, thereby improving liquid preparation efficiency. Furthermore, since bubble removal is not required, the electrolyte in the electrolyte chamber can be directly injected into the injection cup 22 after being filtered by the filter, and controlled by the injection valve. This simplifies the original injection station structure (injection pump, storage device, piping, and valve body) and reduces occupied space.

[0168] During the process of preparing liquid for the liquid injection cup 22, the weighing module 3 and the liquid injection module 2 are first assembled onto the mounting base 1. The liquid injection cup 22 is switched from the pre-installed state to the assembled state. The weight of the liquid injection cup 22 is borne by the weighing module 3, and the weighing module 3 is used to weigh the liquid injection cup 22. The weighing module 3 obtains the initial weight A1 of each liquid injection cup 22 (i.e., the weight of each liquid injection cup 22 before liquid is injected). After weighing, the system records the initial weight A1 of each liquid injection cup 22, opens the injection valve of the injection device, and injects electrolyte into the liquid injection cup 22. The real-time weight A2 of the liquid injection cup 22 is obtained by the weighing module 3, and the system confirms whether the liquid preparation requirements are met by comparing A2-A1 with the target weight A0. If the liquid preparation requirements are met, the liquid preparation is completed. That is to say, by setting a weighing module 3 for weighing the liquid injection cup 22, the injection amount of the electrolyte in the liquid injection cup 22 can be determined. There is no need for an injection pump to control the injection amount, and there is no need for a bubble removal action, thereby improving the liquid preparation efficiency. In addition, the electrolyte in the electrolyte room can be directly injected into the liquid injection cup 22 after being filtered by the filter, which simplifies the structure, reduces costs, reduces the occupied space, and improves the structural compactness of the liquid injection system. The liquid preparation step of this liquid injection method is highly efficient, and before the normally closed valve opening device is unlocked, the liquid injection cup 22 remains relatively sealed from the outside world, ensuring that the electrolyte does not leak during the liquid injection weighing. At the same time, the liquid injection weighing action can be completed when the battery pack is assembled, thereby improving the production rhythm.

[0169] In addition, after the filling cup 22 is filled, the real-time weight A2 of the filling cup 22 can be obtained by the weighing module 3 (A2 refers to the weight of the filling cup 22 after the electrolyte is injected, that is, the weight of the filling cup 22 itself and the weight of the electrolyte). After the electrolyte in the filling cup 22 is injected into the battery, the filling cup 22 at this time is weighed to obtain A3 (A3 refers to the weight of the filling cup 22 itself and the weight of the residual electrolyte), that is, the weight of the electrolyte injected into the battery is A2-A3. In other words, the filling method of the embodiment of the present disclosure can eliminate the process of separate weighing before and after battery filling, thereby improving production efficiency.

[0170] In some embodiments, by comparing A2-A1 with the target weight A0, determining whether the liquid reserve requirement is met includes:

[0171] Step S410: If A2-A1≥A0, confirm that the liquid preparation requirement is met;

[0172] Step S420 : If A2 − A1 < A0 , it is determined that the electrolyte preparation requirement is not met, and electrolyte continues to be injected into the liquid injection cup 22 .

[0173] A2-A1 refers to the weight of the electrolyte injected into the injection cup 22, and the target weight A0 is greater than or equal to the weight of the electrolyte that needs to be injected into the battery.

[0174] That is, if the weight A2-A1 of the electrolyte injected into the injection cup 22 is greater than or equal to the target weight A0, that is, the electrolyte stored in the injection cup 22 is sufficient to meet the amount of electrolyte required to be injected into the battery, and this indicates that the electrolyte reserve requirement is met. Conversely, if the weight A2-A1 of the electrolyte injected into the injection cup 22 is less than the target weight A0, that is, the electrolyte stored in the injection cup 22 does not meet the amount of electrolyte required to be injected into the battery, this indicates that the electrolyte reserve requirement is not met, and electrolyte continues to be injected into the injection cup 22 until the electrolyte reserve requirement is met.

[0175] In some embodiments, if A2-A1<A0, it is determined that the liquid preparation requirement is not met, and the electrolyte is continued to be injected into the injection cup 22. The method also includes: if the liquid preparation requirement is still not met within a predetermined time, the system alarm prompts.

[0176] If the electrolyte injection standard is not reached within the scheduled time, that is, the liquid reserve demand is not met within the scheduled time, this means that there may be a problem with the system. The system will then issue an alarm to allow staff to come and repair it in time to avoid wasting time.

[0177] In some embodiments, if A2-A1≥A0, then confirming that the liquid preparation requirement is met includes:

[0178] Based on the electrolyte flow rate q of the injection device and the reaction time t of the injection valve, it is determined whether to close the injection valve.

[0179] It is understandable that the injection valve has a certain reaction time, that is, after the system issues an instruction to close the injection valve, the injection valve needs to be closed after a certain period of time. During the reaction time, a part of the electrolyte will continue to flow into the injection cup 22, resulting in inaccurate preparation of the liquid.

[0180] Therefore, the embodiment of the present disclosure determines whether to close the injection valve based on the electrolyte flow rate q of the injection device and the reaction time t of the injection valve. That is, the amount of electrolyte injected by the injection valve within the reaction time is calculated, and the injection valve is closed in advance, thereby improving the accuracy of the preparation liquid.

[0181] In some embodiments, determining whether to close the injection valve based on the electrolyte flow rate q of the injection device and the reaction time t of the injection valve includes:

[0182] If A2-A1+qt≥A0, close the injection valve;

[0183] If A2-A1+qt<A0, the injection valve is opened and the electrolyte is continuously injected into the injection cup 22.

[0184] The electrolyte flow rate q of the injection device is obtained through experiments, and the reaction time t of the injection valve is measured at the same time. It is calculated that under normal flow, the injection amount of electrolyte in the closing reaction time t of the injection valve is qt, that is, the corrected target injection amount is the original target injection amount - the injection amount of electrolyte in the closing reaction time t of the injection valve, that is, A2-A1+qt≥A0. If A2-A1+qt<A0, it means that the preparation liquid demand is not met, then the injection valve is opened, and the electrolyte is continued to be injected into the injection cup 22 until the preparation liquid demand is met, thereby improving the accuracy of the preparation liquid.

[0185] In some embodiments, the battery includes a switch valve with an open state and a closed state. The liquid injection system also includes a vacuum pumping module that is independent of the liquid injection module 2. The liquid injection method also includes a vacuum pumping step, and the liquid preparation step is performed before the vacuum pumping step, or simultaneously with the vacuum pumping step. The vacuum pumping step includes:

[0186] Connect the vacuum pipe of the vacuum module to the switch valve to open the switch valve;

[0187] Controlling the vacuum device of the vacuum module to vacuum the battery;

[0188] After confirming that the vacuuming is completed, separate the vacuuming pipe from the switch valve to keep the switch valve in the closed state.

[0189] The battery includes an on-off valve with an open state and a closed state. That is, the on-off valve is a normally closed type. When the on-off valve is not subjected to external forces, the internal cavity of the battery remains relatively sealed from the external environment.

[0190] The liquid injection system also includes a vacuum module that is independent of the liquid injection module 2. This eliminates the need to share the vacuum pipeline of the vacuum module and the liquid injection pipeline of the liquid injection module 2, thus preventing residual electrolyte in the pipeline from diffusing into other pipelines and valves in the vacuum module during the vacuuming process, thereby preventing the pipelines and valves from becoming clogged.

[0191] The liquid injection method also includes a vacuuming step, and the electrolyte preparation step is performed before or simultaneously with the vacuuming step. Because the battery's on / off valve and the valve opening device of the liquid injection system are both normally closed, electrolyte can be injected into the liquid injection cup 22 at any time before the battery and liquid injection cup 22 are assembled, reducing serial processing time (liquid preparation time) and improving production efficiency.

[0192] The vacuuming device is, for example, a vacuum pump.

[0193] It should be noted that after a single battery pack is assembled on a tray, the handling robot may vacuum the trayed battery pack, or individual batteries may be vacuumed before being assembled on a tray.

[0194] During vacuuming, the vacuuming pipe of the vacuuming module is connected to the switch valve so that the switch valve is in an open state, and the vacuuming device of the vacuuming module is controlled to vacuum the battery. After confirming that the vacuuming is completed, the vacuuming pipe is separated from the switch valve so that the switch valve is in a closed state. At this time, the vacuuming step is completed. The liquid injection system also includes a vacuuming module that is independent of the liquid injection module 2. In this way, the vacuuming pipeline of the vacuuming module and the liquid injection pipeline of the liquid injection module 2 do not need to be shared, which avoids the residual electrolyte in the pipeline from diffusing to other pipelines and valve bodies of the vacuuming module during the vacuuming process, causing the pipelines and valve bodies to be blocked. The liquid preparation step is performed before the vacuuming step, or at the same time as the vacuuming step. In this way, the electrolyte can be injected into the liquid injection cup 22 in advance at any time before the battery and the liquid injection cup 22 are combined, reducing the serial time (liquid preparation time) to improve production efficiency.

[0195] In some embodiments, the liquid injection method further includes a liquid injection step after the vacuuming step and the liquid preparation step, and the liquid injection step includes:

[0196] Connect the valve opening device to the on-off valve so that both the valve opening device and the on-off valve are in the open state;

[0197] Controlling the liquid injection module 2 to inject liquid into the battery;

[0198] After confirming that the injection is completed, separate the valve opening device from the switch valve so that both the valve opening device and the switch valve are in the closed state.

[0199] The vacuuming step can be completed at any stage before the battery is filled.

[0200] During liquid injection, the lifting system brings the valve opening device of the liquid injection cup 22 into contact with the switch valve of the battery (for example, controlling the liquid injection cup 22 tray 21 to move toward the battery, or controlling the battery tray 21 to move toward the liquid injection cup 22). First, the valve opening device of the liquid injection cup 22 contacts the switch valve of the battery. The liquid injection channel formed after the contact remains sealed from the external environment. Since the valve opening device and the switch valve are subjected to the interaction force, the switch valve is forced to open. At the same time, the valve opening device is also opened by the interaction force. At this time, the valve opening device and the switch valve are both in the open state, and the liquid injection module 2 is controlled to inject liquid into the battery. After confirming that the liquid injection is completed, the valve opening device is separated from the switch valve so that the valve opening device and the switch valve are both in the closed state.

[0201] In some embodiments, the opening pressure of the valve opening device is greater than or equal to the opening pressure of the switch valve.

[0202] The opening pressure of the valve opening device is greater than the opening pressure of the on-off valve. In other words, after the valve opening device contacts the battery, the on-off valve opens first due to the interaction force between the valve opening device and the on-off valve, and then the valve opening device opens. This prevents the on-off valve of the battery from being closed after the valve opening device opens during the electrolyte injection process, thereby improving the problem of electrolyte leakage.

[0203] The opening pressure of the valve opening device is equal to the opening pressure of the on-off valve. In other words, after the valve opening device contacts the battery, the on-off valve and the valve opening device are opened simultaneously due to the interaction force between the valve opening device and the on-off valve. This prevents the on-off valve of the battery from remaining closed after the valve opening device opens during the electrolyte injection process, thereby improving the problem of electrolyte leakage.

[0204] By setting the opening pressure of the valve opening device to be greater than or equal to the opening pressure of the switch valve, it is possible to avoid the situation where the switch valve of the battery is still in a closed state after the valve opening device is opened, thereby improving the problem of electrolyte leakage.

[0205] In the description of the present disclosure, the descriptions with reference to the terms "in one embodiment", "in some embodiments", "in other embodiments", "in yet other embodiments", or "exemplary" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present disclosure. In the present disclosure, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine different embodiments or examples described in the present disclosure and features of different embodiments or examples, unless they are mutually inconsistent.

[0206] The foregoing description is merely a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present disclosure are intended to be within the scope of protection of the present disclosure.

Claims

1. A liquid injection system for a battery, comprising: A mounting base; A liquid injection module, including a tray and a liquid injection cup; A weighing module, disposed on the mounting base; Wherein, the liquid injection cup includes a pre-installed state and an assembled state. In the pre-installed state of the liquid injection cup, the liquid injection cup is pre-installed on the tray, and the weight of the liquid injection cup is borne by the tray; in the assembled state of the liquid injection cup, the liquid injection cup is assembled onto the weighing module, and the weight of the liquid injection cup is borne by the weighing module, and the weighing module is used to weigh the liquid injection cup.

2. The liquid injection system according to claim 1, wherein The tray includes at least one pre-installed support position, and the liquid injection cup includes at least one pre-installed support portion. In the pre-installed state of the liquid injection cup, the liquid injection cup is supported on the pre-installed support position through the pre-installed support portion and is located at a first height relative to the tray.

3. The liquid injection system according to claim 2, wherein, The weighing module includes at least one assembled support position, and the liquid injection cup includes at least one assembled support portion. In the assembled state of the liquid injection cup, the liquid injection cup is supported on the first assembled support position through the assembled support portion and is located at a second height relative to the tray, and the second height is not equal to the first height.

4. The liquid injection system according to any one of claims 1-3, wherein, The tray is provided with a clearance area, and the liquid injection cup passes through the clearance area through the weighing module.

5. The liquid injection system according to any one of claims 1-3, wherein, At least one first support column is provided on the mounting base, and at least one first support hole is provided on the tray. The tray is supported on the first support column through the first support hole.

6. The liquid injection system according to any one of claims 1-5, wherein, At least a part of the outer side wall of the liquid injection cup protrudes with a pre-installed support portion. In the pre-installed state of the liquid injection cup, the liquid injection cup is supported on the upper surface of the tray through the pre-installed support portion and is located at a first height relative to the tray.

7. The liquid injection system according to claim 6, wherein, At least one second support hole is provided at the bottom of the liquid injection cup. The weighing module is disposed below the tray and includes at least one second support column; in the assembled state of the liquid injection cup, the pre-installed support portion is spaced from the upper surface of the tray, and the liquid injection cup is supported on the second support column through the second support hole and is located at a second height relative to the tray, and the second height is not equal to the first height.

8. The liquid injection system according to claim 7, wherein, The weighing module includes a weighing device and a weighing bracket disposed on the weighing device. The second support column is disposed on the weighing bracket, and the weighing device is used to weigh the liquid injection cup.

9. The liquid injection system according to claim 8, wherein, The weighing module further includes a mounting plate, and the weighing device is disposed on the mounting plate.

10. The liquid injection system according to any one of claims 7-9, wherein, The weighing module includes a plurality of weighing units, each of the weighing units includes the weighing device and the weighing bracket, the liquid injection module includes a plurality of the liquid injection cups, and the liquid injection cups correspond to the weighing units one by one.

11. The liquid injection system according to any one of claims 6-10, wherein, The liquid injection module further includes a guiding member disposed on the tray for guiding the movement of the liquid injection cup in its height direction.

12. The liquid injection system according to claim 11, wherein, The guiding member is a guiding bracket. A guiding groove is defined between the guiding bracket and the upper surface of the tray. A guiding post extending toward the upper surface of the tray is provided on the top wall of the guiding groove. A guiding hole is provided on the pre-installed supporting portion. The guiding post is in sliding fit with the guiding hole to guide the movement of the liquid injection cup in its height direction.

13. A liquid injection method for a battery, which is applied to the liquid injection system of the battery according to any one of claims 1-12. The liquid injection module further includes a liquid injection device and a valve opening device provided on the liquid injection cup. The valve opening device has an open state and a closed state. The liquid injection method includes a liquid preparation step, and the liquid preparation step includes: Obtaining the initial weight A1 of the liquid injection cup through the weighing module; Opening the liquid injection valve of the liquid injection device and injecting electrolyte into the liquid injection cup; Obtaining the real-time weight A2 of the liquid injection cup through the weighing module; Confirming whether the liquid preparation requirement is met by comparing the size of A2 - A1 with the target weight A0; If the liquid preparation requirement is met, the liquid preparation is completed.

14. The liquid injection method according to claim 13, wherein The step of confirming whether the liquid preparation requirement is met by comparing the size of A2 - A1 with the target weight A0 includes: If A2 - A1 ≥ A0, it is confirmed that the liquid preparation requirement is met; If A2 - A1 < A0, it is confirmed that the liquid preparation requirement is not met, and electrolyte continues to be injected into the liquid injection cup.

15. The liquid injection method according to claim 14, wherein, The step of if A2 - A1 ≥ A0, it is confirmed that the liquid preparation requirement is met, includes: Determining whether to close the liquid injection valve based on the electrolyte flow rate q of the liquid injection device and the response time t of the liquid injection valve.

16. The liquid injection method according to claim 15, wherein, The step of determining whether to close the liquid injection valve based on the electrolyte flow rate q of the liquid injection device and the response time t of the liquid injection valve includes: If A2 - A1 + qt ≥ A0, close the liquid injection valve; If A2 - A1 + qt < A0, open the liquid injection valve and continue to inject electrolyte into the liquid injection cup.

17. The liquid injection method according to any one of claims 14-16, wherein, The step of if A2 - A1 < A0, it is confirmed that the liquid preparation requirement is not met, and electrolyte continues to be injected into the liquid injection cup, further includes: If the liquid preparation requirement is still not met within a predetermined time, the system gives an alarm prompt.

18. The liquid injection method according to any one of claims 13-17, wherein, The battery includes a switching valve having an open state and a closed state. The liquid injection system further includes a vacuum pumping module independent of the liquid injection module. The liquid injection method further includes a vacuum pumping step. The liquid preparation step is before the vacuum pumping step or is carried out simultaneously with the vacuum pumping step. The vacuum pumping step includes: Docking the vacuum pumping pipeline of the vacuum pumping module with the switching valve to make the switching valve in the open state; Controlling the vacuum pumping device of the vacuum pumping module to pump vacuum for the battery; After confirming that the vacuum pumping is completed, separating the vacuum pumping pipeline from the switching valve to make the switching valve in the closed state.

19. The liquid injection method according to claim 18, wherein, The liquid injection method further includes a liquid injection step after the vacuum pumping step and the liquid preparation step. The liquid injection step includes: Docking the valve opening device with the switching valve to make both the valve opening device and the switching valve in the open state; Controlling the liquid injection module to inject liquid into the battery; After confirming that the liquid injection is completed, separate the valve opening device from the switching valve so that both the valve opening device and the switching valve are in a closed state.

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