Battery cell liquid injection control method, device, system and equipment and storage medium

Abstract

The invention discloses a battery cell liquid injection control method and device, system and equipment and a storage medium, and the battery cell liquid injection control method comprises the steps that the liquid injection temperature deviation of an electrolyte to be injected into a battery cell is determined, and the liquid injection temperature deviation is used for representing the difference value between the current temperature of the electrolyte and the reference temperature; the initial liquid injection density and the unit temperature density variation of the electrolyte are obtained; determining the current liquid injection amount deviation of the battery cell according to the target liquid injection amount, the liquid injection temperature deviation, the initial liquid injection density and the unit temperature density variation of the battery cell; and sending the current liquid injection amount deviation to a liquid injection pump, so that the liquid injection pump performs liquid injection compensation on the battery cell according to the current liquid injection amount deviation. According to the method, in the battery cell liquid injection process, liquid injection compensation is performed on the battery cell based on the liquid injection temperature deviation of the electrolyte, so that the problem of liquid injection amount deviation caused by liquid injection temperature change is reduced, and the battery performance is improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a method for controlling liquid injection of a battery cell and its device, system, equipment and storage medium. Background Art

[0002] The cell filling process is an important step in the battery manufacturing process. The accuracy of the cell filling process determines the amount of electrolyte injected into the cell. If too much or too little electrolyte is injected into the cell, the battery performance will be reduced.

[0003] At present, during the battery cell injection process, the injection pump injects the battery cell according to the preset injection volume. However, the density of the electrolyte changes with the injection temperature. When the injection temperature changes, the density of the electrolyte changes, resulting in a deviation in the injection volume of the battery cell, thereby reducing the battery performance. Summary of the invention

[0004] In view of this, the embodiments of the present application provide a method for controlling liquid injection of a battery cell and its device, system, equipment and storage medium to overcome the above problems of the prior art.

[0005] In a first aspect, an embodiment of the present application provides a method for controlling liquid injection of a battery cell, comprising: Determine the injection temperature deviation of the electrolyte to be injected into the battery cell, where the injection temperature deviation is used to represent the difference between the current temperature of the electrolyte and the reference temperature; Obtaining the initial injection density of the electrolyte and the density change per unit temperature; Determine the current injection amount deviation of the battery cell according to the target injection amount, injection temperature deviation, initial injection density and density change per unit temperature of the battery cell. The target injection amount is used to characterize the injection amount of the electrolyte to be injected into the battery cell, and the current injection amount deviation is used to characterize the deviation of the injection amount caused by the current temperature change. The current injection volume deviation is sent to the injection pump, so that the injection pump performs injection compensation on the battery cell according to the current injection volume deviation.

[0006] The solution provided in the present application performs injection compensation on the battery cell based on the injection temperature deviation of the electrolyte during the battery cell injection process, thereby reducing the problem of injection amount deviation caused by changes in the injection temperature, which is beneficial to improving battery performance.

[0007] Furthermore, based on the injection volume of the battery cell, the injection temperature deviation of the electrolyte, the initial injection density and the density change per unit temperature, the injection volume deviation is calculated, thereby improving the calculation accuracy of the injection volume deviation.

[0008] Among them, in some optional embodiments, the method for controlling the injection of the battery cell further includes: Get the cell weight of the battery cell; The target injection volume is determined based on the target weight of the battery cell and the battery cell weight.

[0009] The solution provided in this embodiment calculates the injection amount of the battery cell according to the target weight of the battery cell and the weight of the battery cell, thereby improving the calculation accuracy of the injection amount.

[0010] Among them, in some optional embodiments, determining the injection temperature deviation of the electrolyte to be injected into the battery cell includes: At the current moment, the temperature of the electrolyte is collected to obtain the current temperature; Calculate the injection temperature deviation based on the reference temperature and the current temperature.

[0011] The solution provided in this embodiment calculates the injection temperature deviation based on the reference temperature and the current temperature, which is conducive to improving the calculation accuracy of the injection temperature deviation.

[0012] Among them, in some optional embodiments, the method for controlling the injection of the battery cell further includes: At the initial moment, the temperature of the electrolyte is collected to obtain the initial temperature; Establish a reference temperature based on the initial temperature.

[0013] The solution provided in this embodiment establishes a reference temperature based on a pre-collected initial temperature before collecting the current temperature, which is beneficial to improving the calculation accuracy of the injection temperature deviation.

[0014] In some optional embodiments, establishing a reference temperature according to the initial temperature includes: Determine whether the initial temperature is within a preset temperature range; In the case where it is determined that the initial temperature is within the preset temperature range, the initial temperature is determined as the reference temperature.

[0015] The solution provided in this embodiment establishes a reference temperature based on the initial temperature when it is determined that the initial temperature is within a preset reasonable temperature range, thereby improving the accuracy of the reference temperature and facilitating further improving the calculation accuracy of the injection temperature deviation.

[0016] Wherein, in some optional embodiments, the initial temperature includes a first sub-temperature and a second sub-temperature, the first sub-temperature and the second sub-temperature are temperatures at different positions of the same cross section of the injection pipe, and the injection pipe is used to transport the electrolyte; Determine whether the initial temperature is within the preset temperature range, including: calculating a temperature difference between the first sub-temperature and the second sub-temperature; When it is determined that the temperature difference is less than or equal to the temperature difference threshold, it is determined whether the first sub-temperature and the second sub-temperature are within a preset temperature range.

[0017] In the solution provided by this embodiment, the temperature difference between the first sub-temperature and the second sub-temperature is small, and the accuracy of initial temperature collection is high, which is conducive to improving the accuracy of the reference temperature.

[0018] In some optional embodiments, when it is determined that the initial temperature is within a preset temperature range, determining the initial temperature as the reference temperature includes: When it is determined that the first sub-temperature and the second sub-temperature are within the preset temperature range, the first sub-temperature or the second sub-temperature is determined as the reference temperature.

[0019] In some optional embodiments, sending the current injection volume deviation to the injection pump includes: Determine whether the current injection volume deviation is within the preset deviation range; When it is determined that the current injection volume deviation is within the preset deviation range, the current injection volume deviation is sent to the injection pump.

[0020] The solution provided in this embodiment, when it is determined that the injection amount deviation is within a reasonable deviation range, performs injection compensation on the battery cell based on the injection amount deviation, which is beneficial to improving the injection control accuracy.

[0021] In some optional embodiments, sending the current injection volume deviation to the injection pump includes: Calculate the sum of the deviations of the historical injection volume deviation and the current injection volume deviation to obtain the cumulative injection volume deviation; Determine whether the cumulative injection volume deviation is within the preset cumulative deviation range; When it is determined that the cumulative injection volume deviation is within the preset cumulative deviation range, the current injection volume deviation is sent to the injection pump.

[0022] The solution provided in this embodiment, when the cumulative injection amount deviation is within a reasonable range, performs injection compensation on the battery cell based on the injection amount deviation, which can prevent the injection amount from exceeding due to multiple injection compensations, and is beneficial to further improve the injection control accuracy.

[0023] Among them, in some optional embodiments, the method for controlling the injection of the battery cell further includes: Update the historical injection volume deviation to the cumulative injection volume deviation; Return to execute determining the injection temperature deviation of the electrolyte to be injected into the battery cell.

[0024] The solution provided in this embodiment continuously detects the temperature deviation of the electrolyte after the battery cell is injected with compensation based on the injection temperature deviation of the electrolyte, so as to continuously inject compensation into the battery cell according to the injection temperature deviation, which is beneficial to further improve the injection control accuracy.

[0025] In a second aspect, an embodiment of the present application provides a liquid injection control device for a battery cell, comprising: A first determination module is used to determine an injection temperature deviation of an electrolyte to be injected into the battery cell, where the injection temperature deviation is used to characterize a difference between a current temperature of the electrolyte and a reference temperature; The first acquisition module is used to obtain the initial injection density of the electrolyte and the density change per unit temperature; The second determination module is used to determine the current injection amount deviation of the battery cell according to the target injection amount, injection temperature deviation, initial injection density and unit temperature density change of the battery cell, the target injection amount is used to characterize the injection amount of the electrolyte to be injected into the battery cell, and the current injection amount deviation is used to characterize the deviation of the injection amount caused by the current temperature change; The first sending module is used to send the current injection volume deviation to the injection pump, so that the injection pump performs injection compensation on the battery cell according to the current injection volume deviation.

[0026] In a third aspect, an embodiment of the present application provides a liquid injection system for a battery cell, including a liquid storage tank, a liquid injection pump, and a control device, wherein the liquid storage tank is used to store electrolyte; A control device, used to determine the injection temperature deviation of the electrolyte to be injected into the battery cell, and obtain the initial injection density of the electrolyte and the density change per unit temperature, and determine the current injection volume deviation of the battery cell according to the target injection volume, injection temperature deviation, initial injection density and density change per unit temperature of the battery cell, and send the current injection volume deviation to the injection pump, the injection temperature deviation is used to characterize the difference between the current temperature of the electrolyte and the reference temperature, the target injection volume is used to characterize the injection volume of the electrolyte to be injected into the battery cell, and the current injection volume deviation is used to characterize the deviation of the injection volume caused by the current temperature change; The injection pump is used to inject the electrolyte from the storage tank into the battery cell according to the current injection amount deviation.

[0027] In a fourth aspect, an embodiment of the present application provides an electronic device, including: Memory; one or more processors coupled to the memory; One or more applications, wherein the one or more applications are stored in a memory and configured to be executed by one or more processors, and the one or more applications are configured to execute the battery cell injection control method provided in the first aspect above.

[0028] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, in which a program code is stored. The program code can be called by a processor to execute the liquid injection control method of the battery cell provided in the first aspect above.

[0029] In a sixth aspect, an embodiment of the present application provides a computer program product. When the computer program product is run on a computer device, the computer device executes the battery cell injection control method provided in the first aspect above.

[0030] It can be understood that the beneficial effects of the second to sixth aspects mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or exemplary technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A schematic diagram of a scenario of a liquid injection system for a battery cell provided in an embodiment of the present application is shown.

[0033] Figure 2 A schematic flow chart of a method for controlling liquid injection of a battery cell provided in an embodiment of the present application is shown.

[0034] Figure 3 Another schematic flow chart of the method for controlling liquid injection of a battery cell provided in an embodiment of the present application is shown.

[0035] Figure 4 Another schematic flow chart of the method for controlling liquid injection of a battery cell provided in an embodiment of the present application is shown.

[0036] Figure 5 Another schematic flow chart of the method for controlling liquid injection of a battery cell provided in an embodiment of the present application is shown.

[0037] Figure 6 Another schematic flow chart of the method for controlling liquid injection of a battery cell provided in an embodiment of the present application is shown.

[0038] Figure 7 A schematic diagram of a scenario flow of a method for controlling liquid injection of a battery cell provided in an embodiment of the present application is shown.

[0039] Figure 8 A structural block diagram of a liquid injection control device for a battery cell provided in an embodiment of the present application is shown.

[0040] Fig. 9 A functional block diagram of an electronic device provided in an embodiment of the present application is shown.

[0041] Fig.10A computer-readable storage medium provided in an embodiment of the present application for storing or carrying a program code for implementing a liquid injection control method for a battery cell provided in an embodiment of the present application is shown.

[0042] Fig.11 A computer program product provided in an embodiment of the present application and used for storing or carrying program codes for implementing the liquid injection control method of the battery cell provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0043] In order to make the purpose, features, and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the embodiments described below are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0044] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0045] It should also be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in this application specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates other working conditions.

[0046] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0047] In addition, in the description of the present application, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0048] The cell filling process is an important step in the battery manufacturing process. The accuracy of the cell filling process determines the amount of electrolyte injected into the cell. If too much or too little electrolyte is injected into the cell, the battery performance will be reduced.

[0049] At present, during the battery cell injection process, the injection pump injects the battery cell according to the preset injection volume. However, the density of the electrolyte changes with the injection temperature. When the injection temperature changes, the density of the electrolyte changes, resulting in a deviation in the injection volume of the battery cell, thereby reducing the battery performance.

[0050] In response to the above problems, the embodiments of the present application provide a method for controlling the injection of a battery cell and its device, system, equipment and storage medium. By determining the injection temperature deviation of the electrolyte to be injected into the battery cell, the injection temperature deviation is used to characterize the difference between the current temperature of the electrolyte and the reference temperature, and obtaining the initial injection density of the electrolyte and the density change per unit temperature, and determining the current injection volume deviation of the battery cell according to the target injection volume of the battery cell, the injection temperature deviation, the initial injection density and the density change per unit temperature, the target injection volume is used to characterize the injection volume of the electrolyte to be injected into the battery cell, the current injection volume deviation is used to characterize the deviation of the injection volume caused by the current temperature change, and the current injection volume deviation is sent to the injection pump, so that the injection pump performs injection compensation on the battery cell according to the current injection volume deviation. In the process of injecting the battery cell, the battery cell is injected based on the injection temperature deviation of the electrolyte, which reduces the problem of injection volume deviation caused by changes in the injection temperature, and is conducive to improving battery performance.

[0051] Furthermore, based on the injection volume of the battery cell, the injection temperature deviation of the electrolyte, the initial injection density and the density change per unit temperature, the injection volume deviation is calculated, thereby improving the calculation accuracy of the injection volume deviation.

[0052] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0053] See also Figure 1 , which shows a schematic diagram of an application scenario of the liquid injection system of the battery cell provided in an embodiment of the present application. The liquid injection system of the battery cell may include a battery cell 100, an electrolyte 200, a liquid storage tank 300, an injection pump 400 and a control device 500.

[0054] Among them, the battery cell 100 may include but is not limited to any one of lithium battery cells, lead-acid battery cells, nickel-cadmium battery cells, nickel-metal hydride battery cells, zinc-silver battery cells, iron-chromium liquid flow battery cells and all-vanadium liquid flow battery cells, and the number of battery cells 100 may include but is not limited to one or more.

[0055] The electrolyte 200 may include, but is not limited to, any one of an aqueous electrolyte, an organic electrolyte, an ionic liquid electrolyte, and a solid electrolyte.

[0056] The liquid storage tank 300 can be used to store the electrolyte 200, and the liquid storage tank 300 can include but is not limited to any one of a stainless steel liquid storage tank, a glass liquid storage tank, and a plastic liquid storage tank.

[0057] The injection pump 400 may be connected to the liquid storage tank 300 through a pipeline, and the injection pump 400 may be used to inject the electrolyte 200 stored in the liquid storage tank 300 into the battery cell 100 .

[0058] The injection pump 400 may include but is not limited to any one of an electric injection pump, a pneumatic injection pump, a hydraulic injection pump, etc., and the number of the injection pumps 400 may include but is not limited to one or more.

[0059] The control device 500 can be connected to the injection pump 400 based on a preset communication protocol and perform data exchange with the injection pump 400. The control device 500 can include but is not limited to any one of a server or a terminal device.

[0060] The server may include but is not limited to an independent physical server, a server cluster or distributed system consisting of multiple physical servers, and a cloud server.

[0061] Terminal devices may include but are not limited to mobile terminal devices (for example, mobile phones, PDAs, tablet PCs, laptops, smart watches, smart bracelets, etc.) and fixed terminal devices (for example, desktop computers, smart panels, all-in-one computers, etc.).

[0062] The preset communication protocol may include, but is not limited to, Factory Interface Network Service Transmission Control Protocol (FINS TCP), Modbus protocol, or Multi Point Interface protocol.

[0063] In some embodiments, the liquid injection system of the battery cell may further include a temperature sensor 600 , and the temperature sensor 600 may be used to collect the temperature of the electrolyte 200 .

[0064] The temperature sensor 600 may be communicatively connected to the control device 500 and perform data exchange with the control device 500 .

[0065] The number of temperature sensors 600 may include one or more, and the temperature sensor 600 may include but is not limited to any one of a thermistor temperature sensor, a thermocouple temperature sensor, an infrared temperature sensor, a laser temperature sensor, and an ultrasonic temperature sensor.

[0066] In some embodiments, the liquid injection system of the battery cell may further include one or more liquid injection trays 700 , each of which may be used to load one or more battery cells 100 and collect the weight of the loaded one or more battery cells 100 .

[0067] In some embodiments, the control device 500 can determine the injection temperature deviation of the electrolyte 200 based on the temperature of the electrolyte 200 collected by the temperature sensor 600, and determine the target injection volume of the battery cell 100 based on the battery cell weight collected by the injection tray 700, and determine the injection volume deviation of the battery cell 100 based on the target injection volume and the injection temperature deviation, and send the current injection volume deviation to the injection pump 400. The injection pump 400 can inject the electrolyte 200 from the storage tank 300 into the battery cell 100 according to the current injection volume deviation.

[0068] See also Figure 2 , which shows a flow chart of a method for controlling liquid injection of a battery cell provided by an embodiment of the present application. In a specific embodiment, the method for controlling liquid injection of a battery cell can be applied to Figure 1 The control device 500 in the liquid injection system of the battery cell shown in FIG. Figure 2 The process shown is described in detail, and the method for controlling the liquid injection of the battery cell may include the following steps 110 to 130.

[0069] Step 110: Determine the injection temperature deviation of the electrolyte to be injected into the battery cell.

[0070] In an embodiment of the present application, the control device can collect the temperature of the electrolyte at the current moment to obtain the current temperature, and calculate the injection temperature deviation based on the reference temperature and the current temperature of the electrolyte. The injection temperature deviation is calculated based on the reference temperature and the current temperature, which is beneficial to improving the calculation accuracy of the injection temperature deviation.

[0071] Among them, the reference temperature can be used to characterize the reference temperature of the electrolyte during the battery cell injection process. The reference temperature may include but is not limited to a temperature pre-collected based on a temperature sensor, or a temperature pre-set by a user, or a temperature automatically generated by a control device based on a control process of multiple times controlling the battery cell injection, etc.

[0072] Specifically, the liquid injection system of the battery cell may further include a temperature sensor. The control device may send a first acquisition instruction to the temperature sensor at the current moment. The temperature sensor receives and responds to the first acquisition instruction, collects the temperature of the electrolyte, obtains the current temperature, and sends the current temperature to the control device. The control device receives the current temperature returned by the temperature sensor, and calculates the difference between the reference temperature and the current temperature to obtain the liquid injection temperature deviation.

[0073] As an example, the current temperature of the electrolyte may be T1, and the reference temperature of the electrolyte may be T0. The injection temperature deviation σ may be calculated according to the current temperature T1 and the reference temperature T0 according to Formula 1: T .

[0074] Formula 1 is: T =T1-T0.

[0075] Step 120: Obtain the initial injection density of the electrolyte and the density change per unit temperature.

[0076] In the embodiment of the present application, the control device can obtain the initial injection density of the electrolyte and the density change per unit temperature.

[0077] The initial injection density may be the density of the electrolyte at a reference temperature, and the density change per unit temperature may be used to characterize the corresponding relationship between the unit temperature change and the corresponding density change.

[0078] In some embodiments, the control device may pre-store the initial liquid injection density and the density change per unit temperature of the electrolyte, and the control device may read the pre-stored initial liquid injection density and the density change per unit temperature.

[0079] In some embodiments, the control device may search a preset electrolyte parameter table according to an electrolyte identifier of the electrolyte to obtain an initial injection density and a density change per unit temperature.

[0080] The preset electrolyte parameter table can be used to characterize the corresponding relationship between the electrolyte identifier and the initial injection density and the density change per unit temperature.

[0081] For example, the electrolyte identification may include electrolyte A, electrolyte B and electrolyte C, the initial injection density may include a first initial injection density ρ'0, a second initial injection density ρ''0 and a third initial injection density ρ'''0, and the unit temperature density change may include a first unit temperature density change K1, a second unit temperature density change K2 and a third unit temperature density change K3.

[0082] The correspondence between the electrolyte identification and the initial liquid injection density and the density change per unit temperature can be shown in Table 1, that is, the preset electrolyte parameter table, and the initial liquid injection density and the density change per unit temperature corresponding to the electrolyte identification can be obtained according to the correspondence.

[0083] Table 1

[0084] It should be noted that the corresponding relationship between the electrolyte identification and the initial injection density and the density change per unit temperature may include but is not limited to that shown in Table 1.

[0085] In some embodiments, the control device may generate a first prompt message, and receive the initial injection density of the electrolyte and the density change per unit temperature uploaded by the user according to the first prompt message.

[0086] Among them, the first prompt information can be used to prompt the user to upload the initial injection density of the electrolyte and the unit temperature density change to the control device. The first prompt information may include but is not limited to at least any one of text prompt information, sound prompt information, and light prompt information.

[0087] Step 130: Determine the current liquid filling amount deviation of the battery cell according to the target liquid filling amount, liquid filling temperature deviation, initial liquid filling density and density change per unit temperature of the battery cell.

[0088] In an embodiment of the present application, the control device can determine the current filling amount deviation of the battery cell based on the target filling amount, filling temperature deviation, initial filling density and unit temperature density change of the battery cell, and calculate the filling amount deviation based on the filling amount of the battery cell, the filling temperature deviation of the electrolyte, the initial filling density and the unit temperature density change, thereby improving the calculation accuracy of the filling amount deviation.

[0089] Among them, the target injection volume is related to the cell weight of the battery cell. The target injection volume can be used to characterize the injection volume of the electrolyte to be injected into the battery cell. The current injection volume deviation can be used to characterize the deviation of the injection volume of the electrolyte to be injected due to the current temperature change of the electrolyte.

[0090] As an example, the initial injection density of the electrolyte may be ρ0, the unit temperature density change of the electrolyte may be K, and the target injection volume of the battery cell may be M. The target injection volume M, the injection temperature deviation σ T , initial injection density ρ0 and unit temperature density change K, and calculate the current injection volume deviation ΔM0 according to Formula 2.

[0091] Formula 2 is: ΔM0=σ T •K•(M / ρ0)=(T1-T0)•K•(M / ρ0).

[0092] Step 140: Send the current injection volume deviation to the injection pump, so that the injection pump performs injection compensation on the battery cell according to the current injection volume deviation.

[0093] In an embodiment of the present application, the control device can send the current injection volume deviation to the injection pump, the injection pump receives and responds to the current injection volume deviation, and performs injection compensation on the battery cell according to the current injection volume deviation. During the battery cell injection process, the battery cell is injected based on the injection temperature deviation of the electrolyte, thereby reducing the problem of injection volume deviation caused by changes in the injection temperature, which is beneficial to improving battery performance.

[0094] Regarding the process in which the above-mentioned injection pump compensates for the injection of the battery cell according to the current injection volume deviation, in some embodiments, the injection pump can calculate the current injection density based on the current injection volume deviation, the target injection volume and the initial injection density, and calculate the number of rotations of the motor of the injection pump according to the single-turn volume of the injection pump, the current injection density and the target injection volume, and control the rotation of the motor according to the number of rotations.

[0095] As an example, the current injection density ρ1 can be calculated according to Formula 3 based on the current injection volume deviation ΔM0, the target injection volume M and the initial injection density ρ0.

[0096] Formula three is: ρ1=((M-ΔM0)•ρ0) / M.

[0097] The number of rotations n can be calculated according to Formula 4 based on the single-turn volume v of the injection pump, the current injection density ρ1 and the target injection volume M.

[0098] n=(M / ρ1) / v.

[0099] Among them, the single-turn volume can be used to characterize the injection volume squeezed out by the motor of the injection pump when it rotates one circle. The single-turn volume is related to the motor model and is a constant.

[0100] The solution provided by the present application determines the injection temperature deviation of the electrolyte to be injected into the battery cell, the injection temperature deviation is used to characterize the difference between the current temperature of the electrolyte and the reference temperature, and obtains the initial injection density of the electrolyte and the density change per unit temperature, and determines the current injection volume deviation of the battery cell according to the target injection volume of the battery cell, the injection temperature deviation, the initial injection density and the density change per unit temperature, the target injection volume is used to characterize the injection volume of the electrolyte to be injected into the battery cell, the current injection volume deviation is used to characterize the deviation of the injection volume caused by the current temperature change, and the current injection volume deviation is sent to the injection pump, so that the injection pump performs injection compensation on the battery cell according to the current injection volume deviation. During the cell injection process, the battery cell is injected based on the injection temperature deviation of the electrolyte, thereby reducing the problem of injection volume deviation caused by changes in the injection temperature, which is beneficial to improving battery performance.

[0101] Furthermore, based on the injection volume of the battery cell, the injection temperature deviation of the electrolyte, the initial injection density and the density change per unit temperature, the injection volume deviation is calculated, thereby improving the calculation accuracy of the injection volume deviation.

[0102] See also Figure 3 , which shows a flow chart of a liquid injection control method for a battery cell provided by another embodiment of the present application. In a specific embodiment, the liquid injection control method for a battery cell can be applied to Figure 1 The control device 500 in the liquid injection system of the battery cell shown in FIG. Figure 3The process shown is described in detail, and the method for controlling the liquid injection of the battery cell may include the following steps 210 to 260.

[0103] Step 210: Determine the injection temperature deviation of the electrolyte to be injected into the battery cell.

[0104] Step 220: Obtain the initial injection density of the electrolyte and the density change per unit temperature.

[0105] In this embodiment, step 210 and step 220 may refer to the contents of the corresponding steps in the aforementioned embodiment, which will not be described in detail here.

[0106] Step 230: Obtain the cell weight of the cell.

[0107] In this embodiment, the control device may obtain the cell weight of the cell, so as to determine the target liquid injection volume of the cell according to the cell weight.

[0108] In some embodiments, the liquid injection tray for loading the battery cells may be provided with a weighing sensor, and the weighing sensor may be communicatively connected to the control device and perform data exchange with the control device.

[0109] The control device can send a second collection instruction to the weighing sensor. The weighing sensor receives and responds to the second collection instruction, collects the weight of the battery cell, obtains the weight of the battery cell, and sends the weight of the battery cell to the control device. The control device receives the weight of the battery cell returned by the weighing sensor.

[0110] The weighing sensor may include but is not limited to any one of a photoelectric weighing sensor, a hydraulic weighing sensor, and an electromagnetic weighing sensor.

[0111] In some embodiments, the control device may generate a second prompt message, and receive the cell weight of the battery cell uploaded by the user according to the second prompt message.

[0112] The second prompt information may be used to prompt the user to upload the battery cell weight of the battery cell to the control device, and the second prompt information may include but is not limited to at least any one of text prompt information, sound prompt information, and light prompt information.

[0113] Step 240: Determine the target liquid injection volume according to the target weight of the battery cell and the battery cell weight.

[0114] In this embodiment, the control device can obtain the target weight of the battery cell, and calculate the difference between the target weight of the battery cell and the weight of the battery cell to obtain the target injection volume, and calculate the injection volume of the battery cell based on the target weight of the battery cell and the weight of the battery cell, thereby improving the calculation accuracy of the injection volume.

[0115] Among them, the target weight can be used to characterize the reference weight of the battery cell. The target weight may include but is not limited to the weight set in advance by the user according to the battery cell model, or the weight automatically generated by the control device according to the control process of multiple times controlling the battery cell injection, etc.

[0116] Regarding the process of the control device acquiring the target weight of the battery cell, in some embodiments, the control device may pre-store the target weight of the battery cell, and the control device may read the pre-stored target weight.

[0117] Regarding the process of the control device acquiring the target weight of the battery cell, in some embodiments, the control device may generate a third prompt message, and receive the target weight of the battery cell uploaded by the user according to the third prompt message.

[0118] The third prompt information may be used to prompt the user to upload the target weight of the battery cell to the control device, and the third prompt information may include but is not limited to at least any one of text prompt information, sound prompt information, and light prompt information.

[0119] Step 250: Determine the current injection volume deviation according to the target injection volume, injection temperature deviation, initial injection density and unit temperature density change.

[0120] Step 260: Send the current injection volume deviation to the injection pump.

[0121] In this embodiment, step 250 and step 260 may refer to the contents of the corresponding steps in the aforementioned embodiment, which will not be described in detail here.

[0122] The solution provided in this embodiment determines the injection temperature deviation of the electrolyte to be injected into the battery cell, obtains the initial injection density of the electrolyte and the density change per unit temperature, obtains the battery cell weight, and determines the target injection volume according to the target weight of the battery cell and the battery cell weight, and determines the current injection volume deviation according to the target injection volume, injection temperature deviation, initial injection density and the density change per unit temperature, and sends the current injection volume deviation to the injection pump. During the battery cell injection process, the battery cell is injected with compensation based on the injection temperature deviation of the electrolyte, thereby reducing the problem of injection volume deviation caused by changes in the injection temperature, which is beneficial to improving battery performance.

[0123] Furthermore, based on the injection volume of the battery cell, the injection temperature deviation of the electrolyte, the initial injection density and the density change per unit temperature, the injection volume deviation is calculated, thereby improving the calculation accuracy of the injection volume deviation.

[0124] Furthermore, the injection amount of the battery cell is calculated according to the target weight of the battery cell and the weight of the battery cell, thereby improving the calculation accuracy of the injection amount.

[0125] See also Figure 4, which shows a flow chart of a liquid injection control method for a battery cell provided in another embodiment of the present application. In a specific embodiment, the liquid injection control method for a battery cell can be applied to Figure 1 The control device 500 in the liquid injection system of the battery cell shown in FIG. Figure 4 The process shown is described in detail, and the method for controlling the liquid injection of the battery cell may include the following steps 310 to 370.

[0126] Step 310: collecting the temperature of the electrolyte at the initial moment to obtain the initial temperature.

[0127] In this embodiment, the control device can collect the temperature of the electrolyte at the initial moment to obtain the initial temperature.

[0128] The initial moment and the current moment may be separated by a preset time, which may include but is not limited to a time preset by a user, or a time automatically generated by a control device according to a control process of controlling the battery cell injection multiple times, etc. For example, the preset time may be 5 seconds (s).

[0129] Specifically, the control device can send a third acquisition instruction to the temperature sensor at the initial moment. The temperature sensor receives and responds to the third acquisition instruction, collects the temperature of the electrolyte, obtains the initial temperature, and sends the initial temperature to the control device. The control device receives the initial temperature returned by the temperature sensor.

[0130] Step 320: Establish a reference temperature according to the initial temperature.

[0131] In this embodiment, the control device can establish a reference temperature based on the initial temperature. Before collecting the current temperature, the reference temperature is established based on the pre-collected initial temperature, which is beneficial to improving the calculation accuracy of the injection temperature deviation.

[0132] In some embodiments, the control device can determine whether the initial temperature is within a preset temperature range, and if it is determined that the initial temperature is within the preset temperature range, a reference temperature is established based on the initial temperature; if it is determined that the initial temperature is within a preset reasonable temperature range, the initial temperature is determined as the reference temperature, thereby improving the accuracy of the reference temperature and facilitating further improving the calculation accuracy of the injection temperature deviation.

[0133] The preset temperature range may be used to characterize the reference temperature range of the electrolyte during the cell injection process, and the preset temperature range may include but is not limited to a temperature range preset by a user, or a temperature range automatically generated by a control device according to a control process of controlling the cell injection multiple times, etc. For example, the preset temperature range may include but is not limited to 15°C-30°C or 16°C-25°C, etc.

[0134] In some embodiments, the initial temperature may include a first sub-temperature and a second sub-temperature, the first sub-temperature may be acquired based on a first temperature sensor, and the second sub-temperature may be acquired based on a second temperature sensor. The first temperature sensor and the second temperature sensor may be disposed at different positions of the same cross section of the injection pipe, and the injection pipe may be used to transport the injection liquid.

[0135] The control device can calculate the temperature difference between the first sub-temperature and the second sub-temperature, and determine whether the temperature difference is less than or equal to the temperature difference threshold, and when it is determined that the temperature difference is less than or equal to the temperature difference threshold, determine whether the first sub-temperature and the second sub-temperature are within a preset temperature range, and when it is determined that the first sub-temperature and the second sub-temperature are within the preset temperature range, determine the first sub-temperature or the second sub-temperature as the reference temperature. The temperature difference between the first sub-temperature and the second sub-temperature is small, and the accuracy of the initial temperature acquisition is high, which is conducive to improving the accuracy of the reference temperature.

[0136] The temperature difference threshold may include but is not limited to a temperature difference preset by a user, or a temperature difference automatically generated by a control device according to a control process of controlling the battery cell injection multiple times, etc. For example, the temperature difference threshold may include but is not limited to 0.5°C, 0.8°C or 1°C, etc.

[0137] Step 330: collecting the temperature of the electrolyte at the current moment to obtain the current temperature.

[0138] Step 340: Calculate the injection temperature deviation according to the reference temperature and the current temperature.

[0139] Step 350: Obtain the initial injection density of the electrolyte and the density change per unit temperature.

[0140] Step 360: Determine the current liquid filling amount deviation of the battery cell according to the target liquid filling amount, liquid filling temperature deviation, initial liquid filling density and unit temperature density change of the battery cell.

[0141] Step 370: Send the current injection volume deviation to the injection pump.

[0142] In this embodiment, step 330, step 340, step 350, step 360 and step 370 may refer to the contents of the corresponding steps in the aforementioned embodiments, which will not be repeated here.

[0143] In some embodiments, the control device can determine whether the initial temperature is within a preset temperature range, and if it is determined that the initial temperature is not within the preset temperature range, it can generate and send a first warning message to a human-machine interface (HMI) so that the user can confirm the injection temperature according to the first warning message, which is beneficial to improving the user experience during the battery cell injection process.

[0144] The first warning information may be used to prompt the user to confirm the injection temperature, and the first warning information may include but is not limited to at least any one of text warning information, sound warning information, and light warning information.

[0145] In some embodiments, the control device can calculate the temperature difference between the first sub-temperature and the second sub-temperature, and determine whether the temperature difference is less than or equal to the temperature difference threshold, and when it is determined that the temperature difference is greater than the temperature difference threshold, generate and send a second warning message to the HMI so that the user can calibrate the temperature sensor according to the second warning message, which is beneficial to improving the user experience during the battery cell filling process.

[0146] The second warning information may be used to prompt the user to calibrate the temperature sensor, and the second warning information may include but is not limited to at least any one of text warning information, sound warning information, and light warning information.

[0147] The solution provided in this embodiment collects the temperature of the electrolyte at the initial moment to obtain the initial temperature, and establishes a reference temperature based on the initial temperature, and collects the temperature of the electrolyte at the current moment to obtain the current temperature, and calculates the injection temperature deviation based on the reference temperature and the current temperature, and obtains the initial injection density of the electrolyte and the density change per unit temperature, and determines the current injection volume deviation of the battery cell based on the target injection volume of the battery cell, the injection temperature deviation, the initial injection density and the density change per unit temperature, and sends the current injection volume deviation to the injection pump. During the injection process of the battery cell, the battery cell is injected with compensation based on the injection temperature deviation of the electrolyte, thereby reducing the problem of injection volume deviation caused by changes in the injection temperature, which is beneficial to improving battery performance.

[0148] Furthermore, based on the injection volume of the battery cell, the injection temperature deviation of the electrolyte, the initial injection density and the density change per unit temperature, the injection volume deviation is calculated, thereby improving the calculation accuracy of the injection volume deviation.

[0149] Furthermore, before collecting the current temperature, establishing a reference temperature based on the pre-collected initial temperature is beneficial to improving the calculation accuracy of the injection temperature deviation.

[0150] See also Figure 5, which shows a flow chart of a liquid injection control method for a battery cell provided in another embodiment of the present application. In a specific embodiment, the liquid injection control method for a battery cell can be applied to Figure 1 The control device 500 in the liquid injection system of the battery cell shown in FIG. Figure 5 The process shown is described in detail, and the method for controlling the liquid injection of the battery cell may include the following steps 410 to 450.

[0151] Step 410: Determine the injection temperature deviation of the electrolyte to be injected into the battery cell.

[0152] Step 420: Obtain the initial injection density of the electrolyte and the density change per unit temperature.

[0153] Step 430: Determine the current liquid filling amount deviation of the battery cell according to the target liquid filling amount, liquid filling temperature deviation, initial liquid filling density and density change per unit temperature of the battery cell.

[0154] In this embodiment, step 410, step 420 and step 430 may refer to the contents of the corresponding steps in the aforementioned embodiment, which will not be described again here.

[0155] Step 440: Determine whether the current injection volume deviation is within a preset deviation range.

[0156] In this embodiment, the control device can determine whether the current injection volume deviation is within a preset deviation range.

[0157] Among them, the preset deviation range can be used to characterize the reasonable range of the electrolyte injection amount deviation during the battery cell injection process. The preset deviation range may include but is not limited to the deviation value range pre-set by the user, or the deviation value range automatically generated by the control device according to the control process of multiple times controlling the battery cell injection, etc.

[0158] When the value of the current injection volume deviation is within the range of the preset deviation value, it is determined that the current injection volume deviation is within the preset deviation range; when the value of the current injection volume deviation is not within the range of the preset deviation value, it is determined that the current injection volume deviation is not within the preset deviation range.

[0159] Step 450: When it is determined that the current injection volume deviation is within the preset deviation range, the current injection volume deviation is sent to the injection pump.

[0160] In this embodiment, when the control device determines that the current injection volume deviation is within a preset deviation range, the control device can send the current injection volume deviation to the injection pump. The injection pump receives and responds to the current injection volume deviation, and performs injection compensation on the battery cell according to the current injection volume deviation. When it is determined that the injection volume deviation is within a reasonable deviation range, the battery cell is injected based on the injection volume deviation, which is beneficial to improving the accuracy of injection control.

[0161] In some embodiments, when the control device determines that the current injection volume deviation is not within the preset deviation range, it can generate and send a third warning message to the HMI, so that the user can confirm the current injection volume deviation based on the third warning message, which is beneficial to improving the user experience during the battery cell filling process.

[0162] Among them, the third warning information can be used to prompt the user to confirm the current injection volume deviation, and the third warning information can include but is not limited to at least any one of text warning information, sound warning information, and light warning information.

[0163] The solution provided in this embodiment determines the injection temperature deviation of the electrolyte to be injected into the battery cell, determines the current injection volume deviation of the battery cell according to the target injection volume and the injection temperature deviation of the battery cell, and judges whether the current injection volume deviation is within the preset deviation range, and when it is determined that the current injection volume deviation is within the preset deviation range, sends the current injection volume deviation to the injection pump, and during the battery cell injection process, the battery cell is injected with compensation based on the injection temperature deviation of the electrolyte, thereby reducing the problem of injection volume deviation caused by changes in the injection temperature, which is beneficial to improving battery performance.

[0164] Furthermore, when it is determined that the injection amount deviation is within a reasonable deviation range, the battery cell is injected with liquid compensation based on the injection amount deviation, which is beneficial to improving the injection control accuracy.

[0165] See also Figure 6 , which shows a flow chart of a liquid injection control method for a battery cell provided in another embodiment of the present application. In a specific embodiment, the liquid injection control method for a battery cell can be applied to Figure 1 The control device 500 in the liquid injection system of the battery cell shown in FIG. Figure 6 The process shown is described in detail, and the method for controlling the liquid injection of the battery cell may include the following steps 510 to 570.

[0166] Step 510: Determine the injection temperature deviation of the electrolyte to be injected into the battery cell.

[0167] Step 520: Obtain the initial injection density of the electrolyte and the density change per unit temperature.

[0168] Step 530: Determine the current liquid filling amount deviation of the battery cell according to the target liquid filling amount, liquid filling temperature deviation, initial liquid filling density and density change per unit temperature of the battery cell.

[0169] Step 540: Determine whether the current injection volume deviation is within a preset deviation range.

[0170] In this embodiment, step 510, step 520, step 530 and step 540 may refer to the contents of the corresponding steps in the aforementioned embodiment, which will not be repeated here.

[0171] Step 550: When it is determined that the current injection volume deviation is within the preset deviation range, the deviation sum of the historical injection volume deviation and the current injection volume deviation is calculated to obtain the cumulative injection volume deviation.

[0172] In this embodiment, when the control device determines that the current injection volume deviation is within the preset deviation range, it can calculate the deviation sum of the historical injection volume deviation and the current injection volume deviation to obtain the cumulative injection volume deviation.

[0173] The historical injection amount deviation can be used to characterize the historical deviation of the injection amount of the electrolyte during the historical injection process. As an example, at the initial moment of the cell injection, the historical injection amount deviation is 0, indicating that the electrolyte is not compensated.

[0174] As an example, the historical injection volume deviations may include a first injection volume deviation ΔM1, a second injection volume deviation ΔM2, ..., an Nth injection volume deviation ΔM N The current injection volume deviation may be ΔM0, which may be based on the first injection volume deviation ΔM1, the second injection volume deviation ΔM2, ..., the Nth injection volume deviation ΔM N The previous injection volume deviation can be ΔM0, and the cumulative injection volume deviation ΣΔM is calculated according to formula 4.

[0175] Formula 4 is: ΣΔM=ΔM0+ΔM1+ΔM2+…+ΔM N .

[0176] Step 560: Determine whether the cumulative injection volume deviation is within a preset cumulative deviation range.

[0177] In this embodiment, the control device can determine whether the cumulative injection volume deviation is within a preset cumulative deviation range.

[0178] Among them, the cumulative injection volume deviation can be used to characterize the total deviation of the electrolyte during the battery cell injection process, and the preset cumulative deviation range can be used to characterize the reasonable range of the cumulative injection volume deviation of the electrolyte during the battery cell injection process. The preset cumulative deviation range may include but is not limited to a deviation value range pre-set by the user, or a deviation value range automatically generated by the control device according to a control process of controlling the battery cell injection multiple times.

[0179] When the value of the cumulative injection volume deviation is included in the range of the preset cumulative deviation value, it is determined that the cumulative injection volume deviation is within the preset cumulative deviation range; when the value of the cumulative injection volume deviation is not included in the range of the preset cumulative deviation value, it is determined that the cumulative injection volume deviation is not within the preset cumulative deviation range.

[0180] Step 570: When it is determined that the cumulative injection volume deviation is within the preset cumulative deviation range, the current injection volume deviation is sent to the injection pump.

[0181] In this embodiment, when the control device determines that the cumulative injection volume deviation is within a preset cumulative deviation range, the control device can send the current injection volume deviation to the injection pump. The injection pump receives and responds to the current injection volume deviation, and performs injection compensation on the battery cell according to the current injection volume deviation. When the cumulative injection volume deviation is within a reasonable range, the battery cell is injected based on the injection volume deviation. This can prevent the injection volume from exceeding due to multiple injection compensations, which is beneficial to further improve the accuracy of injection control.

[0182] In some embodiments, when it is determined that the cumulative injection volume deviation is not within the preset cumulative deviation range, a fourth warning message can be generated and sent to the HMI so that the user can confirm the cumulative injection volume deviation based on the fourth warning message, which is beneficial to improving the user experience during the battery cell filling process.

[0183] The fourth warning information may be used to prompt the user to confirm the cumulative injection volume deviation, and the fourth warning information may include but is not limited to at least any one of text warning information, sound warning information, and light warning information.

[0184] In some embodiments, when the control device determines that the cumulative injection volume deviation is within a preset cumulative deviation range, it can send the current injection volume deviation to the injection pump, update the historical injection volume deviation to the cumulative injection volume deviation, and return to execute step 510 and subsequent steps. After compensating the battery cell for injection based on the injection temperature deviation of the electrolyte, the temperature deviation of the electrolyte is continuously detected so as to continuously compensate the battery cell for injection based on the injection temperature deviation, which is beneficial to further improve the accuracy of injection control.

[0185] In one application scenario, such as Figure 7As shown, the battery cell injection control method may include steps 601 to 620.

[0186] Step 601: Collect the first sub-temperature and the second sub-temperature.

[0187] The control device may collect the first sub-temperature based on the first temperature sensor at the initial moment, and collect the second sub-temperature based on the second temperature sensor.

[0188] Step 602: Determine whether the temperature difference between the first sub-temperature and the second sub-temperature is less than or equal to a temperature difference threshold.

[0189] Wherein, when the control device determines that the temperature difference is less than or equal to the temperature difference threshold, the control device may execute step 603; when the control device determines that the temperature difference is greater than the temperature difference threshold, the control device may execute step 616.

[0190] Step 603: Determine whether the first sub-temperature and the second sub-temperature are within a preset temperature range.

[0191] If it is determined that the first sub-temperature and the second sub-temperature are within the preset temperature range, step 604 may be executed; if it is determined that the first sub-temperature and / or the second sub-temperature are not within the preset temperature range, step 615 may be executed.

[0192] Step 604: Establish a reference temperature according to the first sub-temperature or the second sub-temperature, and obtain an initial injection density and a target injection volume of the injection.

[0193] Step 605: Determine whether the initial injection density is within a preset density threshold range.

[0194] The preset density threshold range may include but is not limited to a density range preset by a user, or a density range automatically generated by a control device according to a control process of controlling the battery cell injection multiple times. For example, the preset density threshold range may include but is not limited to 0.8-1.5 g / cm 3 or 1.1-1.9g / cm 3 wait.

[0195] When it is determined that the initial liquid injection density is within the preset density threshold range, step 606 may be executed; when it is determined that the initial liquid injection density is not within the preset density threshold range, step 619 may be executed.

[0196] Step 606: Determine whether the target injection volume is within a preset injection volume threshold range.

[0197] The preset injection volume threshold range may include but is not limited to the injection volume range preset by the user, or the injection volume range automatically generated by the control device according to the control process of controlling the battery cell injection multiple times, etc. For example, the preset injection volume threshold range may include but is not limited to 10-1200g or 50-500g, etc.

[0198] When it is determined that the target injection volume is within the preset injection volume threshold range, step 607 may be executed; when it is determined that the target injection volume is not within the preset injection volume threshold range, step 620 may be executed.

[0199] Step 607: Collect the current temperature.

[0200] The current temperature is the temperature collected at the current moment, and the preset time interval between the current moment and the initial moment may be 5 seconds.

[0201] Step 608: Calculate the injection temperature deviation according to the reference temperature and the current temperature.

[0202] Step 609: Calculate the current injection volume deviation according to the target injection volume, injection temperature deviation, initial injection density and density change per unit temperature.

[0203] Step 610: Determine whether the current injection volume deviation is within a preset deviation range.

[0204] Wherein, when it is determined that the current injection volume deviation is within the preset deviation range, step 611 can be executed; when it is determined that the current injection volume deviation is not within the preset deviation range, step 617 can be executed.

[0205] Step 611: Calculate the sum of the deviations of the historical injection volume deviation and the current injection volume deviation to obtain the cumulative injection volume deviation.

[0206] Step 612: Determine whether the cumulative injection volume deviation is within a preset cumulative deviation range.

[0207] Wherein, when it is determined that the cumulative injection volume deviation is within the preset cumulative deviation range, step 613 can be executed; when it is determined that the cumulative injection volume deviation is not within the preset cumulative deviation range, step 618 can be executed.

[0208] Step 613: Send the current injection volume deviation to the injection pump.

[0209] Step 614: Update the historical injection volume deviation to the cumulative injection volume deviation, and return to execute step 601.

[0210] Step 615: Generate and send a first warning message to the HMI.

[0211] Step 616: Generate and send a second warning message to the HMI.

[0212] Step 617: Generate and send the third warning information to the HMI.

[0213] Step 618: Generate and send a fourth warning message to the HMI.

[0214] Step 619: Generate and send the fifth warning information to the HMI.

[0215] Step 620: Generate and send sixth warning information to the HMI.

[0216] The solution provided in this embodiment determines the injection temperature deviation of the electrolyte to be injected into the battery cell, and determines the current injection volume deviation of the battery cell according to the target injection volume and the injection temperature deviation of the battery cell, and judges whether the current injection volume deviation is within the preset deviation range, and when it is judged that the current injection volume deviation is within the preset deviation range, calculates the sum of the deviations of the historical injection volume deviation and the current injection volume deviation to obtain the cumulative injection volume deviation, and judges whether the cumulative injection volume deviation is within the preset cumulative deviation range, and when it is judged that the cumulative injection volume deviation is within the preset cumulative deviation range, sends the current injection volume deviation to the injection pump, and during the cell injection process, the cell is injected based on the electrolyte injection temperature deviation. This reduces the problem of injection volume deviation caused by changes in the injection temperature, which is beneficial to improving battery performance.

[0217] Furthermore, based on the injection volume of the battery cell, the injection temperature deviation of the electrolyte, the initial injection density and the density change per unit temperature, the injection volume deviation is calculated, thereby improving the calculation accuracy of the injection volume deviation.

[0218] Furthermore, when the cumulative injection volume deviation is within a reasonable range, performing injection compensation on the battery cell based on the injection volume deviation can prevent the injection volume from exceeding due to multiple injection compensations, which is beneficial to further improve the accuracy of injection control.

[0219] See also Figure 8 , which shows a liquid injection control device 800 for a battery cell provided by an embodiment of the present application. In a specific embodiment, the liquid injection control device 800 for a battery cell can be applied to Figure 1 The control device 500 in the liquid injection system of the battery cell shown in FIG. Figure 8 The battery cell liquid injection control device 800 shown in FIG. 8 is described in detail. The battery cell liquid injection control device 800 may include a first determination module 810 , a first acquisition module 820 , a second determination module 830 and a first sending module 840 .

[0220] The first determination module 810 can be used to determine the injection temperature deviation of the electrolyte to be injected into the battery cell, and the injection temperature deviation is used to characterize the difference between the current temperature of the electrolyte and the reference temperature; the first acquisition module 820 can be used to obtain the initial injection density of the electrolyte and the density change per unit temperature; the second determination module 830 can be used to determine the current injection volume deviation of the battery cell based on the target injection volume, injection temperature deviation, initial injection density and density change per unit temperature of the battery cell, the target injection volume can be used to characterize the injection volume of the electrolyte to be injected into the battery cell, and the current injection volume deviation can be used to characterize the deviation of the injection volume caused by the current temperature change; the first sending module 840 can be used to send the current injection volume deviation to the injection pump, so that the injection pump performs injection compensation on the battery cell according to the current injection volume deviation.

[0221] In some embodiments, the battery cell injection control device 800 may further include a second acquisition module and a third determination module.

[0222] The second acquisition module can be used to acquire the cell weight of the battery cell; the third determination module can be used to determine the target liquid injection volume according to the target weight of the battery cell and the cell weight.

[0223] In some implementations, the first determination module 810 may include a collection unit and a calculation unit.

[0224] The acquisition unit can be used to acquire the temperature of the electrolyte at the current moment to obtain the current temperature; the calculation unit can be used to calculate the injection temperature deviation based on the reference temperature and the current temperature.

[0225] In some embodiments, the battery cell injection control device 800 may further include a collection module and a creation module.

[0226] The acquisition module can be used to acquire the temperature of the electrolyte at an initial moment to obtain an initial temperature; the establishment module can be used to establish a reference temperature based on the initial temperature.

[0227] In some implementations, the establishing module may include a judging unit and a determining unit.

[0228] The judging unit may be used to judge whether the initial temperature is within a preset temperature range; the determining unit may be used to determine the initial temperature as a reference temperature if it is judged that the initial temperature is within the preset temperature range.

[0229] In some embodiments, the initial temperature may include a first sub-temperature and a second sub-temperature, the first sub-temperature and the second sub-temperature may be the temperatures at different positions of the same cross-section of an injection pipe, and the injection pipe may be used to transport injection liquid; the judgment unit may include a first calculation sub-unit and a first judgment sub-unit.

[0230] The first calculation subunit can be used to calculate the temperature difference between the first sub-temperature and the second sub-temperature; the first judgment subunit can be used to judge whether the first sub-temperature and the second sub-temperature are within a preset temperature range when it is determined that the temperature difference is less than or equal to the temperature difference threshold.

[0231] In some embodiments, the determining unit may include a determining subunit.

[0232] The determination subunit may be configured to determine the first sub-temperature or the second sub-temperature as the reference temperature when it is determined that the first sub-temperature and the second sub-temperature are within a preset temperature range.

[0233] In some implementations, the first sending module 830 may include a determination module and a sending unit.

[0234] The judgment module can be used to judge whether the current injection volume deviation is within the preset deviation range; the sending unit can be used to send the current injection volume deviation to the injection pump when it is judged that the current injection volume deviation is within the preset deviation range.

[0235] In some implementations, the sending unit may include a second calculating subunit, a second determining subunit, and a sending subunit.

[0236] The second calculation subunit can be used to calculate the sum of the deviations between the historical injection volume deviation and the current injection volume deviation to obtain the cumulative injection volume deviation; the second judgment subunit can be used to judge whether the cumulative injection volume deviation is within the preset cumulative deviation range; the sending subunit can be used to send the current injection volume deviation to the injection pump when it is determined that the cumulative injection volume deviation is within the preset cumulative deviation range.

[0237] In some embodiments, the battery cell injection control device 800 may further include an update module and a return module.

[0238] The update module can be used to update the historical injection amount deviation to the cumulative injection amount deviation; the return module can be used to return the execution of determining the injection temperature deviation of the electrolyte to be injected into the battery cell.

[0239] The solution provided in this embodiment determines the injection temperature deviation of the electrolyte to be injected into the battery cell, the injection temperature deviation is used to characterize the difference between the current temperature of the electrolyte and the reference temperature, and obtains the initial injection density of the electrolyte and the density change per unit temperature, and determines the current injection volume deviation of the battery cell according to the target injection volume of the battery cell, the injection temperature deviation, the initial injection density and the density change per unit temperature, the target injection volume is used to characterize the injection volume of the electrolyte to be injected into the battery cell, the current injection volume deviation is used to characterize the deviation of the injection volume caused by the current temperature change, and the current injection volume deviation is sent to the injection pump, so that the injection pump performs injection compensation on the battery cell according to the current injection volume deviation. During the cell injection process, the battery cell is injected based on the injection temperature deviation of the electrolyte, which reduces the problem of injection volume deviation caused by changes in the injection temperature, which is beneficial to improving battery performance.

[0240] Furthermore, based on the injection volume of the battery cell, the injection temperature deviation of the electrolyte, the initial injection density and the density change per unit temperature, the injection volume deviation is calculated, thereby improving the calculation accuracy of the injection volume deviation.

[0241] It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the embodiments can be referred to each other. For the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. Any processing method described in the method embodiment can be implemented by the corresponding processing module in the device embodiment, and will not be repeated one by one in the device embodiment.

[0242] In addition, each functional module in each embodiment of the present application can be integrated into a processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The above integrated modules can be implemented in the form of hardware or software functional modules.

[0243] See also Fig. 9 , which shows a functional block diagram of an electronic device 900 provided by an embodiment of the present application, and the electronic device 900 may include one or more of the following components: a memory 910, a processor 920, and one or more applications, wherein the one or more applications may be stored in the memory 910 and configured to be executed by the one or more processors 920, and the one or more applications are configured to execute the method described in the aforementioned method embodiment.

[0244] The memory 910 may include a random access memory (RAM) or a read-only memory (ROM). The memory 910 may be used to store instructions, programs, codes, code sets or instruction sets. The memory 910 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for implementing at least one function (such as determining a liquid injection temperature deviation, determining a current liquid injection volume deviation, sending a current liquid injection volume deviation, liquid injection compensation, obtaining an initial liquid injection density, obtaining a unit temperature density change, obtaining a cell weight, determining a target liquid injection volume, collecting a current temperature, calculating a liquid injection temperature deviation, collecting an initial temperature, establishing a reference temperature, calculating a temperature difference, determining whether it is less than or equal to a temperature difference threshold, determining whether the temperature difference is less than or equal to a temperature difference threshold, determining whether it is within a preset deviation range, calculating a deviation sum, obtaining a cumulative liquid injection volume deviation, and updating a historical liquid injection volume deviation, etc.), instructions for implementing the following various method embodiments, etc. The storage data area can also store data created by the electronic device 900 during use (such as battery cells, electrolytes, injection temperature deviation, current temperature, reference temperature, target injection volume, current injection volume deviation, injection pump, initial injection density, density change per unit temperature, battery cell weight, target weight, current time, initial time, initial temperature, preset temperature range, first sub-temperature, second sub-temperature, injection pipeline, same cross-section, different positions, temperature difference, temperature difference threshold, preset deviation range, historical injection volume deviation, cumulative injection volume deviation and preset cumulative deviation range), etc.

[0245] The processor 920 may include one or more processing cores. The processor 920 uses various interfaces and lines to connect various parts of the entire electronic device 900, and executes various functions and processes data of the electronic device 900 by running or executing instructions, programs, code sets or instruction sets stored in the memory 910, and calling data stored in the memory 910. Optionally, the processor 920 can be implemented in at least one hardware form of digital signal processing (DSP), field-programmable gate array (FPGA), and programmable logic array (PLA). The processor 920 can integrate one or a combination of a central processing unit (CPU), a graphics processing unit (GPU), and a modem. Among them, the CPU mainly processes the operating system, user interface, and application programs; the GPU is responsible for rendering and drawing display content; and the modem is used to process wireless communications. It can be understood that the above-mentioned modem may not be integrated into the processor 920, but may be implemented separately through a communication chip.

[0246] Please refer to Fig.10 , which shows a structural block diagram of a computer-readable storage medium provided in an embodiment of the present application. The computer-readable storage medium 1000 stores a program code 1010, and the program code 1010 can be called by a processor to execute the method described in the above method embodiment.

[0247] The computer-readable storage medium 1000 may be an electronic memory such as a flash memory, an EEPROM (electrically erasable programmable read-only memory), an EPROM, a hard disk or a ROM. Optionally, the computer-readable storage medium 1000 includes a non-transitory computer-readable storage medium. The computer-readable storage medium 1000 has storage space for program code 1010 for executing any method steps of the above method. These program codes can be read from or written to one or more computer program products. The program code 1010 can be compressed, for example, in an appropriate form.

[0248] Please refer to Fig.11, which shows a structural block diagram of a computer program product 1100 provided in an embodiment of the present application. The computer program product 1100 includes a computer program / instruction 1110, and the computer program / instruction 1110 is stored in a computer-readable storage medium of a computer device. When the computer program product 1100 is run on a computer device, a processor of the computer device reads the computer program / instruction 1110 from the computer-readable storage medium, and the processor executes the computer program / instruction 1110, so that the computer device performs the method described in the above method embodiment.

[0249] The solution provided in this embodiment determines the injection temperature deviation of the electrolyte to be injected into the battery cell, the injection temperature deviation is used to characterize the difference between the current temperature of the electrolyte and the reference temperature, and obtains the initial injection density of the electrolyte and the density change per unit temperature, and determines the current injection volume deviation of the battery cell according to the target injection volume of the battery cell, the injection temperature deviation, the initial injection density and the density change per unit temperature, the target injection volume is used to characterize the injection volume of the electrolyte to be injected into the battery cell, the current injection volume deviation is used to characterize the deviation of the injection volume caused by the current temperature change, and the current injection volume deviation is sent to the injection pump, so that the injection pump performs injection compensation on the battery cell according to the current injection volume deviation. During the cell injection process, the battery cell is injected based on the injection temperature deviation of the electrolyte, which reduces the problem of injection volume deviation caused by changes in the injection temperature, which is beneficial to improving battery performance.

[0250] Furthermore, based on the injection volume of the battery cell, the injection temperature deviation of the electrolyte, the initial injection density and the density change per unit temperature, the injection volume deviation is calculated, thereby improving the calculation accuracy of the injection volume deviation.

[0251] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for controlling liquid injection of a battery cell, characterized in that: include: Determine an injection temperature deviation of an electrolyte to be injected into a battery cell, wherein the injection temperature deviation is used to characterize a difference between a current temperature of the electrolyte and a reference temperature; Obtaining the initial injection density and density change per unit temperature of the electrolyte; Determine the current injection amount deviation of the battery cell according to the target injection amount of the battery cell, the injection temperature deviation, the initial injection density and the density change per unit temperature, wherein the target injection amount is used to characterize the injection amount of the electrolyte to be injected into the battery cell, and the current injection amount deviation is used to characterize the deviation of the injection amount caused by the current temperature change; The current injection volume deviation is sent to the injection pump, so that the injection pump performs injection compensation on the battery cell according to the current injection volume deviation.

2. The method according to claim 1, characterized in that The method further comprises: Obtaining the battery cell weight of the battery cell; The target liquid injection volume is determined according to the target weight of the battery cell and the battery cell weight.

3. The method according to claim 1, characterized in that The step of determining the injection temperature deviation of the electrolyte to be injected into the battery cell comprises: At the current moment, the temperature of the electrolyte is collected to obtain the current temperature; The injection temperature deviation is calculated according to the reference temperature and the current temperature.

4. The method according to claim 3, characterized in that The method further comprises: At an initial moment, the temperature of the electrolyte is collected to obtain an initial temperature; The reference temperature is established based on the initial temperature.

5. The method according to claim 4, characterized in that The step of establishing the reference temperature according to the initial temperature comprises: Determining whether the initial temperature is within a preset temperature range; If it is determined that the initial temperature is within the preset temperature range, the initial temperature is determined as the reference temperature.

6. The method according to claim 5, characterized in that The initial temperature includes a first sub-temperature and a second sub-temperature, wherein the first sub-temperature and the second sub-temperature are temperatures at different positions of the same cross section of a liquid injection pipe, and the liquid injection pipe is used to transport the electrolyte; The determining whether the initial temperature is within a preset temperature range includes: calculating a temperature difference between the first sub-temperature and the second sub-temperature; When it is determined that the temperature difference is less than or equal to the temperature difference threshold, it is determined whether the first sub-temperature and the second sub-temperature are within the preset temperature range.

7. The method according to claim 6, characterized in that In the case where it is determined that the initial temperature is within the preset temperature range, determining the initial temperature as the reference temperature includes: When it is determined that the first sub-temperature and the second sub-temperature are within the preset temperature range, the first sub-temperature or the second sub-temperature is determined as the reference temperature.

8. The method according to any one of claims 1 to 7, characterized in that The sending the current injection amount deviation to the injection pump includes: Determining whether the current injection volume deviation is within a preset deviation range; When it is determined that the current injection volume deviation is within the preset deviation range, the current injection volume deviation is sent to the injection pump.

9. The method according to claim 8, characterized in that The sending the current injection volume deviation to the injection pump comprises: Calculate the sum of the deviations of the historical injection volume deviation and the current injection volume deviation to obtain the cumulative injection volume deviation; Determining whether the cumulative injection volume deviation is within a preset cumulative deviation range; When it is determined that the cumulative injection volume deviation is within the preset cumulative deviation range, the current injection volume deviation is sent to the injection pump.

10. The method according to claim 9, characterized in that The method further comprises: Updating the historical injection volume deviation to the cumulative injection volume deviation; Return to executing the step of determining the injection temperature deviation of the electrolyte to be injected into the battery cell.

11. A liquid injection control device for a battery cell, characterized in that: include: A first determination module is used to determine an injection temperature deviation of an electrolyte to be injected into a battery cell, wherein the injection temperature deviation is used to represent a difference between a current temperature of the electrolyte and a reference temperature; A first acquisition module is used to acquire the initial injection density of the electrolyte and the density change per unit temperature; A second determination module is used to determine the current injection amount deviation of the battery cell according to the target injection amount of the battery cell, the injection temperature deviation, the initial injection density and the unit temperature density change, the target injection amount is used to characterize the injection amount of the electrolyte to be injected into the battery cell, and the current injection amount deviation is used to characterize the deviation of the injection amount caused by the current temperature change; The first sending module is used to send the current injection volume deviation to the injection pump, so that the injection pump performs injection compensation on the battery cell according to the current injection volume deviation.

12. A liquid injection system for a battery cell, characterized in that: It includes a liquid storage tank, a liquid injection pump and a control device, wherein the liquid storage tank is used to store electrolyte; The control device is used to determine the injection temperature deviation of the electrolyte to be injected into the battery cell, and obtain the initial injection density of the electrolyte and the density change per unit temperature, and determine the current injection volume deviation of the battery cell according to the target injection volume of the battery cell, the injection temperature deviation, the initial injection density and the density change per unit temperature, and send the current injection volume deviation to the injection pump, the injection temperature deviation is used to characterize the difference between the current temperature of the electrolyte and the reference temperature, the target injection volume is used to characterize the injection volume of the electrolyte to be injected into the battery cell, and the current injection volume deviation is used to characterize the deviation of the injection volume caused by the current temperature change; The injection pump is used to inject the electrolyte from the liquid storage tank into the battery cell according to the current injection amount deviation.

13. An electronic device, characterized in that: include: Memory; One or more processors coupled to the memory; One or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the one or more processors, and the one or more applications are configured to execute the method as claimed in any one of claims 1 to 10.

14. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores program codes, which can be called by a processor to execute the method according to any one of claims 1 to 10.

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