Liquid injection control method and device, system, equipment and storage medium for battery cells

Abstract

The present application discloses a method and device, system, equipment and storage medium for controlling the liquid injection of an electric core. The method for controlling the liquid injection of the electric core includes: determining the liquid injection temperature deviation of the electrolyte to be injected into the electric core, where the liquid injection temperature deviation is used to represent the difference between the current temperature of the electrolyte and the reference temperature; obtaining the initial liquid injection density and the unit temperature density change amount of the electrolyte; determining the current liquid injection volume deviation of the electric core according to the target liquid injection volume, liquid injection temperature deviation, initial liquid injection density and unit temperature density change amount of the electric core; and sending the current liquid injection volume deviation to a liquid injection pump, so that the liquid injection pump performs liquid injection compensation on the electric core according to the current liquid injection volume deviation. In the process of liquid injection of the electric core, this method performs liquid injection compensation on the electric core based on the liquid injection temperature deviation of the electrolyte, reduces the problem of deviation in the liquid injection volume caused by the change in the liquid injection temperature, and is beneficial to improving the battery performance.

Description

Technical Field

[0001] This application belongs to the technical field of batteries, and particularly relates to a method and device, system, equipment, and storage medium for controlling the liquid injection of an electric core. Background Art

[0002] The liquid injection process of the electric core is an important link in the battery manufacturing process. The accuracy of the liquid injection process of the electric core determines the amount of electrolyte injected into the electric core. If too much or too little electrolyte is injected into the electric core, the battery performance will decrease.

[0003] Currently, during the liquid injection process of the electric core, the liquid injection pump injects the electric core according to a preset liquid injection amount. However, the density of the electrolyte changes with the change of the liquid injection temperature. When the liquid injection temperature changes, the change in the density of the electrolyte causes a deviation in the amount of liquid injected into the electric core, resulting in a decrease in battery performance. Summary of the Invention

[0004] In view of this, embodiments of this application provide a method and device, system, equipment, and storage medium for controlling the liquid injection of an electric core to overcome the above problems in the prior art.

[0005] In a first aspect, embodiments of this application provide a method for controlling the liquid injection of an electric core, including:

[0006] Determine the liquid injection temperature deviation of the electrolyte to be injected into the electric core, where the liquid injection temperature deviation is used to represent the difference between the current temperature of the electrolyte and the reference temperature;

[0007] Obtain the initial liquid injection density and the unit temperature density change amount of the electrolyte;

[0008] According to the target liquid injection amount of the electric core, the liquid injection temperature deviation, the initial liquid injection density, and the unit temperature density change amount, determine the current liquid injection amount deviation of the electric core. The target liquid injection amount is used to represent the amount of electrolyte to be injected into the electric core, and the current liquid injection amount deviation is used to represent the deviation of the liquid injection amount caused by the current temperature change;

[0009] Send the current liquid injection amount deviation to the liquid injection pump so that the liquid injection pump performs liquid injection compensation on the electric core according to the current liquid injection amount deviation.

[0010] The solution provided by this application performs liquid injection compensation on the electric core based on the liquid injection temperature deviation of the electrolyte during the liquid injection process of the electric core, reduces the problem of deviation in the liquid injection amount caused by the change of the liquid injection temperature, and is beneficial to improving the battery performance.

[0011] Furthermore, calculating the liquid injection amount deviation based on the liquid injection amount of the electric core, the liquid injection temperature deviation of the electrolyte, the initial liquid injection density, and the unit temperature density change amount improves the calculation accuracy of the liquid injection amount deviation.

[0012] Among them, in some alternative embodiments, the electrolyte injection control method for the battery cell further includes:

[0013] Obtaining the weight of the battery cell;

[0014] Determining the target injection volume according to the target weight and the weight of the battery cell.

[0015] The solution provided in this embodiment calculates the injection volume of the battery cell according to the target weight and the weight of the battery cell, improving the calculation accuracy of the injection volume.

[0016] Among them, in some alternative embodiments, determining the injection temperature deviation of the electrolyte to be injected into the battery cell includes:

[0017] Collecting the temperature of the electrolyte at the current moment to obtain the current temperature;

[0018] Calculating the injection temperature deviation according to the reference temperature and the current temperature.

[0019] The solution provided in this embodiment calculates the injection temperature deviation based on the reference temperature and the current temperature, which is beneficial to improving the calculation accuracy of the injection temperature deviation.

[0020] Among them, in some alternative embodiments, the electrolyte injection control method for the battery cell further includes:

[0021] Collecting the temperature of the electrolyte at the initial moment to obtain the initial temperature;

[0022] Establishing a reference temperature according to the initial temperature.

[0023] The solution provided in this embodiment establishes a reference temperature according to the pre-collected initial temperature before collecting the current temperature, which is beneficial to improving the calculation accuracy of the injection temperature deviation.

[0024] Among them, in some alternative embodiments, establishing a reference temperature according to the initial temperature includes:

[0025] Judging whether the initial temperature is within a preset temperature range;

[0026] 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.

[0027] The solution provided in this embodiment establishes a reference temperature according to the initial temperature in the case where it is determined that the initial temperature is within the preset reasonable temperature range, improving the accuracy of the reference temperature and being beneficial to further improving the calculation accuracy of the injection temperature deviation.

[0028] Among them, in some alternative embodiments, the initial temperature includes a first sub-temperature and a second sub-temperature, and the first sub-temperature and the second sub-temperature are the temperatures at different positions of the same cross-section of the injection pipeline for transporting the electrolyte;

[0029] Determine whether the initial temperature is within a preset temperature range, including:

[0030] Calculate the temperature difference between the first sub-temperature and the second sub-temperature;

[0031] 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 the preset temperature range.

[0032] 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 the initial temperature acquisition is high, which is beneficial to improving the accuracy of the reference temperature.

[0033] Among them, in some alternative embodiments, when it is determined that the initial temperature is within the preset temperature range, determining the initial temperature as the reference temperature includes:

[0034] 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.

[0035] Among them, in some alternative embodiments, sending the current liquid injection volume deviation to the liquid injection pump includes:

[0036] Determine whether the current liquid injection volume deviation is within the preset deviation range;

[0037] When it is determined that the current liquid injection volume deviation is within the preset deviation range, send the current liquid injection volume deviation to the liquid injection pump.

[0038] In the solution provided by this embodiment, when it is determined that the liquid injection volume deviation is within the reasonable deviation range, performing liquid injection compensation on the battery cell based on the liquid injection volume deviation is beneficial to improving the accuracy of liquid injection control.

[0039] Among them, in some alternative embodiments, sending the current liquid injection volume deviation to the liquid injection pump includes:

[0040] Calculate the deviation sum of the historical liquid injection volume deviation and the current liquid injection volume deviation to obtain the cumulative liquid injection volume deviation;

[0041] Determine whether the cumulative liquid injection volume deviation is within the preset cumulative deviation range;

[0042] When it is determined that the cumulative liquid injection volume deviation is within the preset cumulative deviation range, send the current liquid injection volume deviation to the liquid injection pump.

[0043] In the solution provided by this embodiment, when the cumulative liquid injection volume deviation is within the reasonable range, performing liquid injection compensation on the battery cell based on the liquid injection volume deviation can prevent the liquid injection volume from exceeding due to multiple liquid injection compensations, which is beneficial to further improving the accuracy of liquid injection control.

[0044] Among them, in some alternative embodiments, the electrolyte injection control method for the battery cell further includes:

[0045] Updating the historical injection volume deviation to the cumulative injection volume deviation;

[0046] Returning to execute to determine the injection temperature deviation of the electrolyte to be injected into the battery cell.

[0047] The solution provided in this embodiment, after compensating the injection of the battery cell based on the injection temperature deviation of the electrolyte, continuously detects the temperature deviation of the electrolyte, so as to continuously compensate the injection of the battery cell according to the injection temperature deviation, which is beneficial to further improving the accuracy of injection control.

[0048] In a second aspect, an embodiment of the present application provides an electrolyte injection control device for a battery cell, including:

[0049] A first determination module, configured to 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;

[0050] A first acquisition module, configured to acquire the initial injection density of the electrolyte and the change amount of the density per unit temperature;

[0051] A second determination module, configured to 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 of the electrolyte, and the change amount of the density per unit temperature, where the target injection volume is used to represent the injection volume of the electrolyte to be injected into the battery cell, and the current injection volume deviation is used to represent the deviation of the injection volume caused by the current temperature change;

[0052] A first sending module, configured to send the current injection volume deviation to the injection pump, so that the injection pump compensates the injection of the battery cell according to the current injection volume deviation.

[0053] In a third aspect, an embodiment of the present application provides an electrolyte injection system for a battery cell, including a liquid storage tank, an injection pump, and a control device. The liquid storage tank is used to store the electrolyte;

[0054] The control device is configured to determine the injection temperature deviation of the electrolyte to be injected into the battery cell, acquire the initial injection density of the electrolyte and the change amount of the density per unit temperature, 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 of the electrolyte, and the change amount of the density per unit temperature, and send the current injection volume deviation to the injection pump. The injection temperature deviation is used to represent the difference between the current temperature of the electrolyte and the reference temperature, the target injection volume is used to represent the injection volume of the electrolyte to be injected into the battery cell, and the current injection volume deviation is used to represent the deviation of the injection volume caused by the current temperature change;

[0055] The injection pump is configured to inject the electrolyte from the liquid storage tank into the battery cell according to the current injection volume deviation.

[0056] In a fourth aspect, an embodiment of the present application provides an electronic device, including:

[0057] A memory;

[0058] One or more processors, coupled to the memory;

[0059] 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 liquid injection control method for the battery cell provided in the first aspect as described above.

[0060] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, in which program code is stored, and the program code can be called by a processor to execute the liquid injection control method for the battery cell provided in the first aspect as described above.

[0061] In a sixth aspect, an embodiment of the present application provides a computer program product, which, when running on a computer device, causes the computer device to execute the liquid injection control method for the battery cell provided in the first aspect as described above.

[0062] It can be understood that the beneficial effects of the second to sixth aspects as described above can be referred to the relevant descriptions in the first aspect, and will not be elaborated here. Description of the Drawings

[0063] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or exemplary technical descriptions. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0064] Figure 1 Shows a schematic diagram of a scenario of the liquid injection system for the battery cell provided in the embodiment of the present application.

[0065] Figure 2 Shows a schematic flowchart of a liquid injection control method for the battery cell provided in the embodiment of the present application.

[0066] Figure 3 Shows another schematic flowchart of the liquid injection control method for the battery cell provided in the embodiment of the present application.

[0067] Figure 4 Shows still another schematic flowchart of the liquid injection control method for the battery cell provided in the embodiment of the present application.

[0068] Figure 5Shows yet another schematic flowchart of the liquid injection control method for the battery cell provided by the embodiments of the present application.

[0069] Figure 6 Shows yet another schematic flowchart of the liquid injection control method for the battery cell provided by the embodiments of the present application.

[0070] Figure 7 Shows a schematic scenario flowchart of the liquid injection control method for the battery cell provided by the embodiments of the present application.

[0071] Figure 8 Shows a structural block diagram of the liquid injection control device for the battery cell provided by the embodiments of the present application.

[0072] Figure 9 Shows a functional block diagram of the electronic device provided by the embodiments of the present application.

[0073] Figure 10 Shows a computer-readable storage medium for storing or carrying program codes for implementing the liquid injection control method for the battery cell provided by the embodiments of the present application.

[0074] Figure 11 Shows a computer program product for storing or carrying program codes for implementing the liquid injection control method for the battery cell provided by the embodiments of the present application. Detailed implementation manners

[0075] To make the objectives, features, and advantages of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the embodiments described below are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0076] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of the described features, wholes, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0077] It should also be understood that the terms used in this specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in this specification of the present application and the appended claims, unless the context clearly indicates otherwise, the singular forms of "a", "an", and "the" are intended to include the plural forms.

[0078] It should be further understood that the term "and / or" used in the specification and appended claims of the present application refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0079] In addition, in the description of the present application, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0080] The electrolyte injection process of the battery cell is an important link in the battery manufacturing process. The accuracy of the electrolyte injection process of the battery cell determines the injection volume of the electrolyte injected into the battery cell. If too much or too little electrolyte is injected into the battery cell, the battery performance will be reduced.

[0081] Currently, during the electrolyte injection process of the battery cell, the injection pump injects the electrolyte into the battery cell according to the preset injection volume. However, the density of the electrolyte changes with the change of the injection temperature. When the injection temperature changes, the change in the density of the electrolyte causes a deviation in the injection volume of the electrolyte injected into the battery cell, resulting in a reduction in battery performance.

[0082] In view of the above problems, the electrolyte injection control method, device, system, equipment and storage medium for the battery cell provided in the embodiments of the present application 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, and obtain the initial injection density and the unit temperature density change amount of the electrolyte, 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 unit temperature density change amount, where the target injection volume is used to represent the injection volume of the electrolyte to be injected into the battery cell, and the current injection volume deviation is used to represent the deviation of the injection volume caused by the current temperature change, and send the current injection volume deviation to the injection pump, so that the injection pump compensates the injection of the battery cell according to the current injection volume deviation. During the electrolyte injection process of the battery cell, the injection of the battery cell is compensated based on the injection temperature deviation of the electrolyte, reducing the problem of deviation in the injection volume caused by the change of the injection temperature, which is beneficial to improving the battery performance.

[0083] Furthermore, calculating the injection volume deviation based on the injection volume of the battery cell, the injection temperature deviation of the electrolyte, the initial injection density and the unit temperature density change amount improves the calculation accuracy of the injection volume deviation.

[0084] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application.

[0085] Please refer to Figure 1 , which shows a schematic diagram of an application scenario of the electrolyte injection system for the battery cell provided in the embodiments of the present application. The electrolyte injection system for 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.

[0086] Among them, the battery cell 100 can 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 flow battery cells, all-vanadium flow battery cells, etc. The number of battery cells 100 can include, but is not limited to, one or more.

[0087] The electrolyte 200 can include, but is not limited to, any one of aqueous electrolytes, organic electrolytes, ionic liquid electrolytes, solid electrolytes, etc.

[0088] The liquid storage tank 300 can be used to store the electrolyte 200. The liquid storage tank 300 can include, but is not limited to, any one of stainless steel liquid storage tanks, glass liquid storage tanks, plastic liquid storage tanks, etc.

[0089] The liquid injection pump 400 can be connected to the liquid storage tank 300 through a pipeline. The liquid injection pump 400 can be used to inject the electrolyte 200 stored in the liquid storage tank 300 into the battery cell 100.

[0090] The liquid injection pump 400 can include, but is not limited to, any one of electric liquid injection pumps, pneumatic liquid injection pumps, hydraulic liquid injection pumps, etc. The number of liquid injection pumps 400 can include, but is not limited to, one or more.

[0091] The control device 500 can be connected to the liquid injection pump 400 based on a preset communication protocol and perform data interaction with the liquid injection pump 400. The control device 500 can include, but is not limited to, any one of a server or a terminal device, etc.

[0092] The server can include, but is not limited to, an independent physical server, a server cluster or a distributed system composed of multiple physical servers, and a cloud server, etc.

[0093] The terminal device can include, but is not limited to, mobile terminal devices (such as mobile phones, personal digital assistants (PDAs), tablet personal computers (Tablet PCs), laptop computers, smart watches, smart bracelets, etc.) and fixed terminal devices (such as desktop computers, smart panels, all-in-one computers, etc.).

[0094] The preset communication protocol can include, but is not limited to, the Factory Interface Network Service Transmission Control Protocol (FINS TCP), the serial communication (Modbus) protocol, or the Multi Point Interface protocol, etc.

[0095] In some embodiments, the liquid injection system of the battery cell may further include a temperature sensor 600, which can be used to collect the temperature of the electrolyte 200.

[0096] The temperature sensor 600 can be communicatively connected to the control device 500 and perform data interaction with the control device 500.

[0097] The number of the temperature sensors 600 can include one or more, and the temperature sensor 600 can include, but is not limited to, any one of a thermosensitive temperature sensor, a thermocouple temperature sensor, an infrared temperature sensor, a laser temperature sensor, an ultrasonic temperature sensor, etc.

[0098] In some embodiments, the liquid injection system of the battery cell may further include one or more liquid injection trays 700. Each liquid injection tray 700 can be used to load one or more battery cells 100 and collect the weight of the loaded one or more battery cells 100.

[0099] In some embodiments, the control device 500 can determine the liquid injection temperature deviation of the electrolyte 200 according to the temperature of the electrolyte 200 collected by the temperature sensor 600, determine the target liquid injection volume of the battery cell 100 according to the weight of the battery cell collected by the liquid injection tray 700, determine the liquid injection volume deviation of the battery cell 100 according to the target liquid injection volume and the liquid injection temperature deviation, and send the current liquid injection volume deviation to the liquid injection pump 400. The liquid injection pump 400 can inject the electrolyte 200 from the liquid storage tank 300 into the battery cell 100 according to the current liquid injection volume deviation.

[0100] Please refer to Figure 2 , which shows a flowchart of a liquid injection control method for a battery cell provided in an embodiment of the present application. In a specific embodiment, the liquid injection control method for a battery cell can be applied to the control device 500 in the liquid injection system of the battery cell as shown in Figure 1 . Taking the control device 500 as an example, the process shown in Figure 2 will be elaborated in detail below. The liquid injection control method for a battery cell can include the following steps 110 to 130.

[0101] Step 110: Determine the liquid injection temperature deviation of the electrolyte to be injected into the battery cell.

[0102] In the 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 liquid injection temperature deviation according to the reference temperature and the current temperature of the electrolyte. Calculating the liquid injection temperature deviation based on the reference temperature and the current temperature is beneficial to improving the calculation accuracy of the liquid injection temperature deviation.

[0103] Among them, the reference temperature can be used to characterize the reference temperature of the electrolyte during the electrolyte injection process of the battery cell. The reference temperature can include but is not limited to the temperature collected in advance based on a temperature sensor, or the temperature preset by the user, or the temperature automatically generated by the control device according to the control process of controlling the electrolyte injection of the battery cell multiple times, etc.

[0104] Specifically, the electrolyte 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 to obtain 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 injection temperature deviation.

[0105] As an example, the current temperature of the electrolyte can be T1, and the reference temperature of the electrolyte can be T0. The injection temperature deviation σ can be calculated according to the current temperature T1 and the reference temperature T0 according to Formula 1 T .

[0106] Formula 1 is: σ T =T1 - T0.

[0107] Step 120: Obtain the initial injection density of the electrolyte and the density change per unit temperature.

[0108] In the embodiments of the present application, the control device may obtain the initial injection density of the electrolyte and the density change per unit temperature.

[0109] Among them, the initial injection density may be the density of the electrolyte at the reference temperature, and the density change per unit temperature can be used to characterize the corresponding relationship between the unit temperature change and the corresponding density change.

[0110] In some embodiments, the control device may pre-store the initial injection density of the electrolyte and the density change per unit temperature, and the control device may read the pre-stored initial injection density and the density change per unit temperature.

[0111] In some embodiments, the control device may look up a preset electrolyte parameter table according to the electrolyte identification of the electrolyte to obtain the initial injection density and the density change per unit temperature.

[0112] Among them, the preset electrolyte parameter table can be used to characterize the corresponding relationship between the electrolyte identification and the initial injection density and the density change per unit temperature.

[0113] For example, the electrolyte identifier may include electrolyte A, electrolyte B, and electrolyte C. The initial filling density may include a first initial filling density ρ'0, a second initial filling density ρ''0, and a third initial filling density ρ'''0. The density change per unit temperature may include a first density change per unit temperature K1, a second density change per unit temperature K2, and a third density change per unit temperature K3.

[0114] The correspondence between the electrolyte identifier, the initial filling density, and the density change per unit temperature may be as shown in Table 1, that is, a preset electrolyte parameter table. According to this correspondence, the initial filling density and the density change per unit temperature corresponding to the electrolyte identifier can be obtained.

[0115] Table 1

[0116]

[0117] It should be noted that the correspondence between the electrolyte identifier, the initial filling density, and the density change per unit temperature may include but is not limited to that shown in Table 1.

[0118] In some embodiments, the control device may generate a first prompt message and receive the initial filling density of the electrolyte and the density change per unit temperature uploaded by the user according to the first prompt message.

[0119] Among them, the first prompt message may be used to prompt the user to upload the initial filling density of the electrolyte and the density change per unit temperature to the control device. The first prompt message may include at least any one of, but is not limited to, text prompt messages, sound prompt messages, and light prompt messages, etc.

[0120] Step 130: Determine the current filling volume deviation of the battery cell according to the target filling volume of the battery cell, the filling temperature deviation, the initial filling density, and the density change per unit temperature.

[0121] In the embodiments of the present application, the control device may determine the current filling volume deviation of the battery cell according to the target filling volume of the battery cell, the filling temperature deviation, the initial filling density, and the density change per unit temperature, and calculate the filling volume deviation based on the filling volume of the battery cell, the filling temperature deviation of the electrolyte, the initial filling density, and the density change per unit temperature, improving the calculation accuracy of the filling volume deviation.

[0122] Among them, the target filling volume is related to the weight of the battery cell of the battery cell, and the target filling volume may be used to characterize the filling volume of the electrolyte to be injected into the battery cell. The current filling volume deviation may be used to characterize the deviation of the filling volume of the electrolyte to be injected caused by the current temperature change of the electrolyte.

[0123] As an example, the initial filling density of the electrolyte can be ρ0, the change in density of the electrolyte per unit temperature can be K, and the target filling volume of the battery cell can be M. The current filling volume deviation ΔM0 can be calculated according to the target filling volume M, the filling temperature deviation σ T , the initial filling density ρ0, and the change in density per unit temperature K according to Formula 2.

[0124] Formula 2 is: ΔM0 = σ T •K•(M / ρ0) = (T1 - T0)•K•(M / ρ0).

[0125] Step 140: Send the current filling volume deviation to the filling pump so that the filling pump compensates the filling of the battery cell according to the current filling volume deviation.

[0126] In the embodiments of the present application, the control device can send the current filling volume deviation to the filling pump. The filling pump receives and responds to the current filling volume deviation, and compensates the filling of the battery cell according to the current filling volume deviation. During the filling process of the battery cell, the filling of the battery cell is compensated based on the filling temperature deviation of the electrolyte, reducing the problem of deviation in the filling volume caused by the change in the filling temperature, which is beneficial to improving the battery performance.

[0127] Regarding the process of the filling pump compensating the filling of the battery cell according to the current filling volume deviation, in some embodiments, the filling pump can calculate the current filling density according to the current filling volume deviation, the target filling volume, and the initial filling density, and calculate the number of rotation turns of the motor of the filling pump according to the single-turn volume of the filling pump, the current filling density, and the target filling volume, and control the rotation of the motor according to the number of rotation turns.

[0128] As an example, the current filling density ρ1 can be calculated according to the current filling volume deviation ΔM0, the target filling volume M, and the initial filling density ρ0 according to Formula 3.

[0129] Formula 3 is: ρ1 = (((M - ΔM0)•ρ0) / M).

[0130] The number of rotation turns n can be calculated according to the single-turn volume v of the filling pump, the current filling density ρ1, and the target filling volume M according to Formula 4.

[0131] n = (M / ρ1) / v.

[0132] Among them, the single-turn volume can be used to represent the filling volume extruded by the motor of the filling pump rotating one turn. The single-turn volume is related to the motor model and is a constant.

[0133] The solution provided by this application determines the injection temperature deviation of the electrolyte to be injected into the battery cell. The injection temperature deviation is used to represent the difference between the current temperature of the electrolyte and the reference temperature. Then, it 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. The target injection volume is used to represent the injection volume of the electrolyte to be injected into the battery cell, and the current injection volume deviation is used to represent the deviation of the injection volume caused by the current temperature change. Then, it sends the current injection volume deviation to the injection pump, so that the injection pump compensates the injection of the battery cell according to the current injection volume deviation. During the injection process of the battery cell, injection compensation is performed on the battery cell based on the injection temperature deviation of the electrolyte, reducing the problem of deviation in the injection volume caused by the change in the injection temperature, which is beneficial to improving the battery performance.

[0134] Furthermore, calculating the injection volume deviation 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 improves the calculation accuracy of the injection volume deviation.

[0135] Please refer to Figure 3 , which shows the flowchart of the injection control method for the battery cell provided by another embodiment of this application. In a specific embodiment, the injection control method for the battery cell can be applied to the control device 500 in the injection system for the battery cell as shown in Figure 1 . Taking the control device 500 as an example, the process shown in Figure 3 will be elaborated in detail below. The injection control method for the battery cell may include the following steps 210 to step 260.

[0136] Step 210: Determine the injection temperature deviation of the electrolyte to be injected into the battery cell.

[0137] Step 220: Obtain the initial injection density of the electrolyte and the density change per unit temperature.

[0138] In this embodiment, steps 210 and 220 can refer to the corresponding steps in the foregoing embodiment, which will not be elaborated here.

[0139] Step 230: Obtain the weight of the battery cell.

[0140] In this embodiment, the control device can obtain the weight of the battery cell to determine the target injection volume of the battery cell according to the weight of the battery cell.

[0141] In some implementation manners, the injection tray for loading the battery cells may be provided with a weighing sensor, and the weighing sensor can be communicatively connected to the control device and perform data interaction with the control device.

[0142] The control device can send a second acquisition instruction to the weighing sensor. The weighing sensor receives and responds to the second acquisition instruction, acquires 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.

[0143] Among them, the weighing sensor can include but is not limited to any one of an optoelectronic weighing sensor, a hydraulic weighing sensor, an electromagnetic weighing sensor, etc.

[0144] In some embodiments, the control device can generate a second prompt message and receive the weight of the battery cell uploaded by the user according to the second prompt message.

[0145] Among them, the second prompt message can be used to prompt the user to upload the weight of the battery cell to the control device. The second prompt message can include but is not limited to at least any one of a text prompt message, a sound prompt message, a light prompt message, etc.

[0146] Step 240: Determine the target injection volume according to the target weight and the weight of the battery cell.

[0147] In this embodiment, the control device can obtain the target weight of the battery cell, calculate the difference between the target weight and the weight of the battery cell to obtain the target injection volume, and calculate the injection volume of the battery cell according to the target weight and the weight of the battery cell, improving the calculation accuracy of the injection volume.

[0148] Among them, the target weight can be used to represent the reference weight of the battery cell. The target weight can include but is not limited to the weight preset by the user according to the battery cell model, or the weight automatically generated by the control device according to the control process of controlling the injection of the battery cell multiple times, etc.

[0149] Regarding the process of the control device obtaining the target weight of the battery cell, in some embodiments, the control device can prestorage the target weight of the battery cell, and the control device can read the prestored target weight.

[0150] Regarding the process of the control device obtaining the target weight of the battery cell, in some embodiments, the control device can generate a third prompt message and receive the target weight of the battery cell uploaded by the user according to the third prompt message.

[0151] Among them, the third prompt message can be used to prompt the user to upload the target weight of the battery cell to the control device. The third prompt message can include but is not limited to at least any one of a text prompt message, a sound prompt message, a light prompt message, etc.

[0152] Step 250: Determine the current injection volume deviation according to the target injection volume, the injection temperature deviation, the initial injection density, and the unit temperature density change amount.

[0153] Step 260: Send the current liquid injection volume deviation to the liquid injection pump.

[0154] In this embodiment, Steps 250 and 260 may refer to the corresponding steps in the foregoing embodiments, and will not be elaborated here.

[0155] The solution provided in this embodiment determines the liquid injection temperature deviation of the electrolyte to be injected into the battery cell, obtains the initial liquid injection density of the electrolyte and the unit temperature density change amount, obtains the weight of the battery cell, determines the target liquid injection volume according to the target weight and the weight of the battery cell, determines the current liquid injection volume deviation according to the target liquid injection volume, the liquid injection temperature deviation, the initial liquid injection density and the unit temperature density change amount, and sends the current liquid injection volume deviation to the liquid injection pump. During 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, reducing the problem of liquid injection volume deviation caused by changes in the liquid injection temperature, which is beneficial to improving battery performance.

[0156] Furthermore, calculating the liquid injection volume deviation based on the liquid injection volume of the battery cell, the liquid injection temperature deviation of the electrolyte, the initial liquid injection density and the unit temperature density change amount improves the calculation accuracy of the liquid injection volume deviation.

[0157] Furthermore, calculating the liquid injection volume of the battery cell according to the target weight and the weight of the battery cell improves the calculation accuracy of the liquid injection volume.

[0158] Please refer to Figure 4 , which shows a flowchart of a battery cell liquid injection control method provided in another embodiment of the present application. In a specific embodiment, the battery cell liquid injection control method may be applied to a control device 500 in a battery cell liquid injection system as shown in Figure 1 . Taking the control device 500 as an example, the process shown in Figure 4 will be elaborated in detail below. The battery cell liquid injection control method may include the following Steps 310 to 370.

[0159] Step 310: Collect the temperature of the electrolyte at the initial moment to obtain the initial temperature.

[0160] In this embodiment, the control device may collect the temperature of the electrolyte at the initial moment to obtain the initial temperature.

[0161] Among them, the initial moment and the current moment may be separated by a preset time period. The preset time period may include but is not limited to a time period preset by the user, or a time period automatically generated by the control device according to the control process of controlling the battery cell liquid injection multiple times. For example, the preset time period may be 5 seconds (s).

[0162] Specifically, the control device may send a third acquisition instruction to the temperature sensor at the initial moment. The temperature sensor receives and responds to the third acquisition instruction, acquires the temperature of the electrolyte to obtain the initial temperature, and sends the initial temperature to the control device. The control device receives the initial temperature returned by the temperature sensor.

[0163] Step 320: Establish a reference temperature based on the initial temperature.

[0164] In this embodiment, the control device may establish a reference temperature according to the initial temperature. Before collecting the current temperature, establishing a reference temperature according to the pre-collected initial temperature is beneficial to improving the calculation accuracy of the injection temperature deviation.

[0165] In some embodiments, the control device may determine whether the initial temperature is within a preset temperature range. When it is determined that the initial temperature is within the preset temperature range, a reference temperature is established according to the initial temperature. When it is determined that the initial temperature is within the preset reasonable temperature range, the initial temperature is determined as the reference temperature, which improves the accuracy of the reference temperature and is beneficial to further improving the calculation accuracy of the injection temperature deviation.

[0166] Among them, the preset temperature range can be used to represent the reference temperature range of the electrolyte during the cell injection process. The preset temperature range may include but is not limited to the temperature range preset by the user, or the temperature range automatically generated by the control device according to the 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.

[0167] 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 arranged at different positions on the same cross-section of the injection pipeline, and the injection pipeline may be used to convey the injection liquid.

[0168] The control device may 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. 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. 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. 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 beneficial to improving the accuracy of the reference temperature.

[0169] Among them, the temperature difference threshold may include but is not limited to the temperature difference preset by the user in advance, or the temperature difference automatically generated by the control device according to the control process of controlling the electrolyte injection of the battery cell multiple times. For example, the temperature difference threshold may include but is not limited to 0.5 °C, 0.8 °C, or 1 °C, etc.

[0170] Step 330: Collect the temperature of the electrolyte at the current moment to obtain the current temperature.

[0171] Step 340: Calculate the injection temperature deviation based on the reference temperature and the current temperature.

[0172] Step 350: Obtain the initial injection density of the electrolyte and the density change per unit temperature.

[0173] Step 360: 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.

[0174] Step 370: Send the current injection volume deviation to the injection pump.

[0175] In this embodiment, Steps 330, 340, 350, 360, and 370 may refer to the content of the corresponding steps in the foregoing embodiments, which will not be elaborated here.

[0176] In some embodiments, the control device may determine whether the initial temperature is within the preset temperature range, and in the case where it is determined that the initial temperature is not within the preset temperature range, generate and send a first warning message to the 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 electrolyte injection process of the battery cell.

[0177] Among them, the first warning message can be used to prompt the user to confirm the injection temperature, and the first warning message may include but is not limited to at least any one of a text warning message, a sound warning message, and a light warning message, etc.

[0178] In some embodiments, the control device may 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 in the case where 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 electrolyte injection process of the battery cell.

[0179] Among them, the second warning message can be used to prompt the user to calibrate the temperature sensor, and the second warning message may include but is not limited to at least any one of a text warning message, a sound warning message, and a light warning message, etc.

[0180] In the solution provided by this embodiment, the temperature of the electrolyte is collected at the initial moment to obtain the initial temperature, and a reference temperature is established based on the initial temperature. The temperature of the electrolyte is collected at the current moment to obtain the current temperature, and the injection temperature deviation is calculated based on the reference temperature and the current temperature. The initial injection density of the electrolyte and the change in density per unit temperature are obtained, and the current injection volume deviation of the battery cell is determined based on the target injection volume of the battery cell, the injection temperature deviation, the initial injection density, and the change in density per unit temperature, and the current injection volume deviation is sent to the injection pump. During the injection process of the battery cell, injection compensation is performed on the battery cell based on the injection temperature deviation of the electrolyte, which reduces the problem of deviation in the injection volume caused by changes in the injection temperature and is beneficial to improving the battery performance.

[0181] Furthermore, calculating the injection volume deviation based on the injection volume of the battery cell, the injection temperature deviation of the electrolyte, the initial injection density, and the change in density per unit temperature improves the calculation accuracy of the injection volume deviation.

[0182] Furthermore, establishing a reference temperature based on the pre-collected initial temperature before collecting the current temperature is beneficial to improving the calculation accuracy of the injection temperature deviation.

[0183] Please refer to Figure 5 , which shows a flowchart of the injection control method for a battery cell provided by another embodiment of the present application. In a specific embodiment, the injection control method for a battery cell can be applied to a control device 500 in an injection system for a battery cell as shown in Figure 1 . Taking the control device 500 as an example, the process shown in Figure 5 will be elaborated in detail below. The injection control method for a battery cell may include the following steps 410 to step 450.

[0184] Step 410: Determine the injection temperature deviation of the electrolyte to be injected into the battery cell.

[0185] Step 420: Obtain the initial injection density of the electrolyte and the change in density per unit temperature.

[0186] Step 430: Determine 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 change in density per unit temperature.

[0187] In this embodiment, steps 410, 420, and 430 may refer to the content of the corresponding steps in the foregoing embodiment, and will not be elaborated herein.

[0188] Step 440: Determine whether the current injection volume deviation is within a preset deviation range.

[0189] In this embodiment, the control device can determine whether the current liquid injection volume deviation is within a preset deviation range.

[0190] Among them, the preset deviation range can be used to represent the reasonable range of the liquid injection volume deviation of the electrolyte during the cell liquid injection process. The preset deviation range can include but is not limited to the deviation value range preset by the user, or the deviation value range automatically generated by the control device according to the control process of controlling the cell liquid injection multiple times, etc.

[0191] When the value of the current liquid injection volume deviation is included in the range of the preset deviation value, it is determined that the current liquid injection volume deviation is within the preset deviation range; when the value of the current liquid injection volume deviation is not included in the range of the preset deviation value, it is determined that the current liquid injection volume deviation is not within the preset deviation range.

[0192] Step 450: When it is determined that the current liquid injection volume deviation is within the preset deviation range, send the current liquid injection volume deviation to the liquid injection pump.

[0193] In this embodiment, when the control device determines that the current liquid injection volume deviation is within the preset deviation range, it can send the current liquid injection volume deviation to the liquid injection pump. The liquid injection pump receives and responds to the current liquid injection volume deviation, and performs liquid injection compensation on the cell according to the current liquid injection volume deviation. When it is determined that the liquid injection volume deviation is within the reasonable deviation range, performing liquid injection compensation on the cell based on the liquid injection volume deviation is beneficial to improving the liquid injection control accuracy.

[0194] In some embodiments, when the control device determines that the current liquid 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 liquid injection volume deviation according to the third warning message, which is beneficial to improving the user experience during the cell liquid injection process.

[0195] Among them, the third warning message can be used to prompt the user to confirm the current liquid injection volume deviation, and the third warning message can include but is not limited to at least any one of text warning messages, sound warning messages, and light warning messages, etc.

[0196] The solution provided in this embodiment determines the liquid injection temperature deviation of the electrolyte to be injected into the cell, determines the current liquid injection volume deviation of the cell according to the target liquid injection volume of the cell and the liquid injection temperature deviation, determines whether the current liquid injection volume deviation is within the preset deviation range, and when it is determined that the current liquid injection volume deviation is within the preset deviation range, sends the current liquid injection volume deviation to the liquid injection pump. During the cell liquid injection process, liquid injection compensation is performed on the cell based on the liquid injection temperature deviation of the electrolyte, reducing the problem of deviation in the liquid injection volume caused by changes in the liquid injection temperature, which is beneficial to improving the battery performance.

[0197] Further, when it is determined that the injection volume deviation is within a reasonable deviation range, compensating the battery cell for the injection volume deviation based on the injection volume deviation is beneficial to improving the accuracy of injection control.

[0198] Please refer to Figure 6 , which shows a flowchart of a method for controlling the injection of an electrolyte into a battery cell provided by another embodiment of the present application. In a specific embodiment, the method for controlling the injection of an electrolyte into a battery cell can be applied to a control device 500 in an injection system for a battery cell as shown in Figure 1 . Taking the control device 500 as an example, the following will elaborate in detail on the Figure 6 shown process. The method for controlling the injection of an electrolyte into a battery cell may include the following steps 510 to 570.

[0199] Step 510: Determine the injection temperature deviation of the electrolyte to be injected into the battery cell.

[0200] Step 520: Obtain the initial injection density of the electrolyte and the density change per unit temperature.

[0201] Step 530: 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.

[0202] Step 540: Determine whether the current injection volume deviation is within a preset deviation range.

[0203] In this embodiment, steps 510, 520, 530, and 540 may refer to the content of the corresponding steps in the foregoing embodiments, and will not be elaborated herein.

[0204] Step 550: When it is determined that the current injection volume deviation is within the preset deviation range, calculate the deviation sum of the historical injection volume deviation and the current injection volume deviation to obtain the cumulative injection volume deviation.

[0205] In this embodiment, when the control device determines that the current injection volume deviation is within the preset deviation range, it may calculate the deviation sum of the historical injection volume deviation and the current injection volume deviation to obtain the cumulative injection volume deviation.

[0206] Among them, the historical injection volume deviation can be used to characterize the historical deviation of the injection volume of the electrolyte during the historical injection process. As an example, at the initial moment of injecting the electrolyte into the battery cell, the historical injection volume deviation is 0, indicating that no compensation is made to the electrolyte.

[0207] As an example, the historical injection volume deviation 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, and the first injection volume deviation ΔM1, the second injection volume deviation ΔM2,..., the Nth injection volume deviation ΔMN The deviation of the previous liquid injection volume can be ΔM0, and the cumulative liquid injection volume deviation ΣΔM is calculated according to Formula 4.

[0208] Formula 4 is: ΣΔM = ΔM0 + ΔM1 + ΔM2 + … + ΔM N 。

[0209] Step 560: Determine whether the cumulative liquid injection volume deviation is within a preset cumulative deviation range.

[0210] In this embodiment, the control device can determine whether the cumulative liquid injection volume deviation is within a preset cumulative deviation range.

[0211] Among them, the cumulative liquid injection volume deviation can be used to characterize the total deviation of the electrolyte during the liquid injection process of the battery cell, and the preset cumulative deviation range can be used to characterize the reasonable range of the cumulative liquid injection volume deviation of the electrolyte during the liquid injection process of the battery cell. The preset cumulative deviation range can include but is not limited to the deviation value range preset by the user, or the deviation value range automatically generated by the control device according to the control process of controlling the liquid injection of the battery cell multiple times, etc.

[0212] In the case where the value of the cumulative liquid injection volume deviation is included in the range of the preset cumulative deviation value, it is determined that the cumulative liquid injection volume deviation is within the preset cumulative deviation range; in the case where the value of the cumulative liquid injection volume deviation is not included in the range of the preset cumulative deviation value, it is determined that the cumulative liquid injection volume deviation is not within the preset cumulative deviation range.

[0213] Step 570: When it is determined that the cumulative liquid injection volume deviation is within the preset cumulative deviation range, send the current liquid injection volume deviation to the liquid injection pump.

[0214] In this embodiment, when the control device determines that the cumulative liquid injection volume deviation is within the preset cumulative deviation range, it can send the current liquid injection volume deviation to the liquid injection pump. The liquid injection pump receives and responds to the current liquid injection volume deviation, and compensates the liquid injection of the battery cell according to the current liquid injection volume deviation. When the cumulative liquid injection volume deviation is within a reasonable range, compensating the liquid injection of the battery cell based on the liquid injection volume deviation can prevent the liquid injection volume from exceeding due to multiple liquid injection compensations, which is beneficial to further improving the accuracy of liquid injection control.

[0215] In some embodiments, when it is determined that the cumulative liquid 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 liquid injection volume deviation according to the fourth warning message, which is beneficial to improving the user experience during the liquid injection process of the battery cell.

[0216] Among them, the fourth warning message can be used to prompt the user to confirm the cumulative liquid injection volume deviation, and the fourth warning message can include at least any one of but is not limited to text warning messages, sound warning messages, and light warning messages, etc.

[0217] In some embodiments, when the control device determines that the cumulative liquid injection volume deviation is within the preset cumulative deviation range, it may send the current liquid injection volume deviation to the liquid injection pump, update the historical liquid injection volume deviation to the cumulative liquid injection volume deviation, and return to execute step 510 and subsequent steps. After compensating the cell for the liquid injection temperature deviation of the electrolyte, continuously detect the temperature deviation of the electrolyte, so as to continuously compensate the cell for the liquid injection according to the liquid injection temperature deviation, which is beneficial to further improve the accuracy of liquid injection control.

[0218] In an application scenario, as Figure 7 shown, the liquid injection control method for the cell may include steps 601 to 620.

[0219] Step 601: Collect the first sub-temperature and the second sub-temperature.

[0220] Among them, the control device may collect the first sub-temperature based on the first temperature sensor and collect the second sub-temperature based on the second temperature sensor at the initial moment.

[0221] Step 602: Determine whether the temperature difference between the first sub-temperature and the second sub-temperature is less than or equal to the temperature difference threshold.

[0222] Among them, when the control device determines that the temperature difference is less than or equal to the temperature difference threshold, it may execute step 603; when the control device determines that the temperature difference is greater than the temperature difference threshold, it may execute step 616.

[0223] Step 603: Determine whether the first sub-temperature and the second sub-temperature are within the preset temperature range.

[0224] Among them, when it is determined that the first sub-temperature and the second sub-temperature are within the preset temperature range, step 604 may be executed; when it is determined that the first sub-temperature and / or the second sub-temperature are not within the preset temperature range, step 615 is executed.

[0225] Step 604: Establish a reference temperature based on the first sub-temperature or the second sub-temperature, and obtain the initial injection density and the target injection volume of the injection.

[0226] Step 605: Determine whether the initial injection density is within the preset density threshold range.

[0227] Among them, the preset density threshold range may include but is not limited to the density range preset by the user, or the density range automatically generated by the control device according to the control process of controlling the liquid injection of the cell multiple times, etc. For example, the preset density threshold range may include but is not limited to 0.8 - 1.5 g / cm 3 or 1.1 - 1.9 g / cm3 etc.

[0228] If it is determined that the initial injection density is within the preset density threshold range, step 606 can be executed; if it is determined that the initial injection density is not within the preset density threshold range, step 619 can be executed.

[0229] Step 606: Determine whether the target injection volume is within the preset injection volume threshold range.

[0230] Among them, the preset injection volume threshold range can 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 injecting liquid into the battery cell multiple times, etc. For example, the preset injection volume threshold range can include but is not limited to 10 - 1200 g or 50 - 500 g, etc.

[0231] If it is determined that the target injection volume is within the preset injection volume threshold range, step 607 can be executed; if it is determined that the target injection volume is not within the preset injection volume threshold range, step 620 can be executed.

[0232] Step 607: Collect the current temperature.

[0233] Among them, the current temperature is the temperature collected at the current moment, and the preset time duration between the current moment and the initial moment can be 5 s.

[0234] Step 608: Calculate the injection temperature deviation according to the reference temperature and the current temperature.

[0235] Step 609: Calculate the current injection volume deviation according to the target injection volume, the injection temperature deviation, the initial injection density, and the unit temperature density change amount.

[0236] Step 610: Determine whether the current injection volume deviation is within the preset deviation range.

[0237] Among them, if it is determined that the current injection volume deviation is within the preset deviation range, step 611 can be executed; if it is determined that the current injection volume deviation is not within the preset deviation range, step 617 can be executed.

[0238] Step 611: Calculate the deviation sum of the historical injection volume deviation and the current injection volume deviation to obtain the cumulative injection volume deviation.

[0239] Step 612: Determine whether the cumulative injection volume deviation is within the preset cumulative deviation range.

[0240] Among them, if it is determined that the cumulative injection volume deviation is within the preset cumulative deviation range, step 613 can be executed; if it is determined that the cumulative injection volume deviation is not within the preset cumulative deviation range, step 618 can be executed.

[0241] Step 613: Send the current liquid injection volume deviation to the liquid injection pump.

[0242] Step 614: Update the historical liquid injection volume deviation to the cumulative liquid injection volume deviation, and return to execute Step 601.

[0243] Step 615: Generate and send a first warning message to the HMI.

[0244] Step 616: Generate and send a second warning message to the HMI.

[0245] Step 617: Generate and send a third warning message to the HMI.

[0246] Step 618: Generate and send a fourth warning message to the HMI.

[0247] Step 619: Generate and send a fifth warning message to the HMI.

[0248] Step 620: Generate and send a sixth warning message to the HMI.

[0249] The solution provided in this embodiment determines the liquid injection temperature deviation of the electrolyte to be injected into the battery cell, determines the current liquid injection volume deviation of the battery cell according to the target liquid injection volume of the battery cell and the liquid injection temperature deviation, determines whether the current liquid injection volume deviation is within a preset deviation range, and when it is determined that the current liquid injection volume deviation is within the preset deviation range, calculates the deviation sum of the historical liquid injection volume deviation and the current liquid injection volume deviation to obtain the cumulative liquid injection volume deviation, determines whether the cumulative liquid injection volume deviation is within a preset cumulative deviation range, and when it is determined that the cumulative liquid injection volume deviation is within the preset cumulative deviation range, sends the current liquid injection volume deviation to the liquid injection pump. During 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, reducing the problem of liquid injection volume deviation caused by changes in the liquid injection temperature, which is beneficial to improving the battery performance.

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

[0251] Furthermore, when the cumulative liquid injection volume deviation is within a reasonable range, liquid injection compensation is performed on the battery cell based on the liquid injection volume deviation, which can prevent the liquid injection volume from exceeding due to multiple liquid injection compensations, and is beneficial to further improving the liquid injection control accuracy.

[0252] Please refer to Figure 8 , which shows the liquid injection control device 800 for a battery cell provided in an embodiment of the present application. In a specific embodiment, the liquid injection control device 800 for a battery cell can be applied to, for example, Figure 1The control device 500 in the liquid injection system of the battery cell shown below will take the control device 500 as an example to Figure 8 elaborate in detail on the liquid injection control device 800 of the battery cell shown. The liquid injection control device 800 of the battery cell may include a first determination module 810, a first acquisition module 820, a second determination module 830, and a first transmission module 840.

[0253] The first determination module 810 may be used to determine the liquid injection temperature deviation of the electrolyte to be injected into the battery cell. The liquid injection temperature deviation is used to represent the difference between the current temperature of the electrolyte and the reference temperature. The first acquisition module 820 may be used to acquire the initial liquid injection density of the electrolyte and the unit temperature density change amount. The second determination module 830 may be used to determine the current liquid injection amount deviation of the battery cell according to the target liquid injection amount of the battery cell, the liquid injection temperature deviation, the initial liquid injection density, and the unit temperature density change amount. The target liquid injection amount may be used to represent the liquid injection amount of the electrolyte to be injected into the battery cell, and the current liquid injection amount deviation may be used to represent the deviation of the liquid injection amount caused by the current temperature change. The first transmission module 840 may be used to send the current liquid injection amount deviation to the 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.

[0254] In some embodiments, the liquid injection control device 800 of the battery cell may further include a second acquisition module and a third determination module.

[0255] The second acquisition module may be used to acquire the weight of the battery cell. The third determination module may be used to determine the target liquid injection amount according to the target weight and the weight of the battery cell.

[0256] In some embodiments, the first determination module 810 may include a collection unit and a calculation unit.

[0257] The collection unit may be used to collect the temperature of the electrolyte at the current moment to obtain the current temperature. The calculation unit may be used to calculate the liquid injection temperature deviation according to the reference temperature and the current temperature.

[0258] In some embodiments, the liquid injection control device 800 of the battery cell may further include a collection module and an establishment module.

[0259] The collection module may be used to collect the temperature of the electrolyte at the initial moment to obtain the initial temperature. The establishment module may be used to establish the reference temperature according to the initial temperature.

[0260] In some embodiments, the establishment module may include a judgment unit and a determination unit.

[0261] The judgment unit may be used to judge whether the initial temperature is within a preset temperature range. The determination unit may be used to determine the initial temperature as the reference temperature when it is determined that the initial temperature is within the preset temperature range.

[0262] 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 the liquid injection pipeline, and the liquid injection pipeline may be used to transport the liquid injection. The determination unit may include a first calculation subunit and a first determination subunit.

[0263] The first calculation subunit may be used to calculate the temperature difference between the first sub-temperature and the second sub-temperature. The first determination subunit may be used to determine 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.

[0264] In some embodiments, the determination unit may include a determination subunit.

[0265] The determination subunit may be used 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 the preset temperature range.

[0266] In some embodiments, the first sending module 830 may include a judgment module and a sending unit.

[0267] The judgment module may be used to judge whether the current liquid injection volume deviation is within a preset deviation range. The sending unit may be used to send the current liquid injection volume deviation to the liquid injection pump when it is determined that the current liquid injection volume deviation is within the preset deviation range.

[0268] In some embodiments, the sending unit may include a second calculation subunit, a second determination subunit, and a sending subunit.

[0269] The second calculation subunit may be used to calculate the deviation sum of the historical liquid injection volume deviation and the current liquid injection volume deviation to obtain the cumulative liquid injection volume deviation. The second determination subunit may be used to judge whether the cumulative liquid injection volume deviation is within a preset cumulative deviation range. The sending subunit may be used to send the current liquid injection volume deviation to the liquid injection pump when it is determined that the cumulative liquid injection volume deviation is within the preset cumulative deviation range.

[0270] In some embodiments, the liquid injection control device 800 of the battery cell may further include an update module and a return module.

[0271] The update module may be used to update the historical liquid injection volume deviation to the cumulative liquid injection volume deviation. The return module may be used to return and execute the liquid injection temperature deviation of the electrolyte to be injected into the battery cell.

[0272] 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 represent 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. 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 current injection volume deviation of the battery cell is determined. The target injection volume is used to represent the injection volume of the electrolyte to be injected into the battery cell, and the current injection volume deviation is used to represent the deviation of the injection volume caused by the current temperature change. Then, 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 battery cell injection process, injection compensation is performed on the battery cell based on the injection temperature deviation of the electrolyte, reducing the problem of deviation in the injection volume caused by the change in the injection temperature, which is beneficial to improving the battery performance.

[0273] Furthermore, calculating the injection volume deviation 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 improves the calculation accuracy of the injection volume deviation.

[0274] It should be noted that the various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. For device embodiments, since they are basically similar to method embodiments, they are described relatively simply. The relevant parts can refer to the partial description of the method embodiments. For any processing method described in the method embodiments, it can be implemented by the corresponding processing module in the device embodiments, and will not be elaborated one by one in the device embodiments.

[0275] In addition, in each embodiment of the present application, the various functional modules can be integrated into one processing module, or each module can exist physically alone, or two or more modules can be integrated into one module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules.

[0276] Please refer to Figure 9 , which shows a functional block diagram of an electronic device 900 provided in an embodiment of the present application. The electronic device 900 may include one or more of the following components: a memory 910, a processor 920, and one or more application programs. One or more application programs may be stored in the memory 910 and configured to be executed by one or more processors 920. One or more application programs are configured to execute the method described in the foregoing method embodiments.

[0277] The memory 910 may include a Random Access Memory (RAM), or may also include a Read-Only Memory. 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. Among them, the program storage area may store instructions for implementing an operating system, instructions for implementing at least one function (such as determining the filling temperature deviation, determining the current filling volume deviation, sending the current filling volume deviation, filling compensation, obtaining the initial filling density, obtaining the unit temperature density change amount, obtaining the cell weight, determining the target filling volume, collecting the current temperature, calculating the filling temperature deviation, collecting the initial temperature, establishing the reference temperature, calculating the temperature difference, determining whether it is less than or equal to the temperature difference threshold, determining that the temperature difference is less than or equal to the temperature difference threshold, determining whether it is within a preset deviation range, calculating the deviation sum, obtaining the cumulative filling volume deviation, and updating the historical filling volume deviation, etc.), and instructions for implementing the following various method embodiments, etc. The data storage area may also store data created during the use of the electronic device 900 (such as cells, electrolytes, filling temperature deviations, current temperatures, reference temperatures, target filling volumes, current filling volume deviations, filling pumps, initial filling densities, unit temperature density change amounts, cell weights, target weights, current times, initial times, initial temperatures, preset temperature ranges, first sub-temperatures, second sub-temperatures, filling pipelines, the same cross-section, different positions, temperature differences, temperature difference thresholds, preset deviation ranges, historical filling volume deviations, cumulative filling volume deviations, and preset cumulative deviation ranges), etc.

[0278] The processor 920 may include one or more processing cores. The processor 920 connects various parts within the entire electronic device 900 through various interfaces and circuits. By running or executing instructions, programs, code sets, or instruction sets stored in the memory 910, and by invoking the data stored in the memory 910, it performs various functions of the electronic device 900 and processes data. Optionally, the processor 920 may be implemented in at least one hardware form of digital signal processing (DSP), field-programmable gate array (FPGA), or programmable logic array (PLA). The processor 920 may integrate one or a combination of several of a central processing unit (CPU), a graphics processing unit (GPU), and a modem, etc. Among them, the CPU mainly processes the operating system, user interface, application programs, etc.; the GPU is responsible for rendering and drawing the displayed content; the modem is used to process wireless communications. It can be understood that the above modem may not be integrated into the processor 920 and may be implemented separately through a communication chip.

[0279] Please refer to Figure 10 , which shows a structural block diagram of a computer-readable storage medium provided by an embodiment of the present application. Program code 1010 is stored in the computer-readable storage medium 1000, and the program code 1010 can be called by a processor to execute the method described in the above method embodiment.

[0280] The computer-readable storage medium 1000 may be an electronic memory such as a flash memory, EEPROM (electrically erasable programmable read-only memory), EPROM, hard disk, or ROM. Optionally, the computer-readable storage medium 1000 includes a non-transitory computer-readable storage medium. The computer-readable storage medium 1000 has a storage space for the program code 1010 that executes any method step in the above method. These program codes can be read out from or written into one or more computer program products. The program code 1010 may be compressed in an appropriate form, for example.

[0281] Please refer to Figure 11, which shows a structural block diagram of a computer program product 1100 provided by an embodiment of the present application. The computer program product 1100 includes computer programs / instructions 1110, and the computer programs / instructions 1110 are stored in a computer-readable storage medium of a computer device. When the computer program product 1100 runs on the computer device, a processor of the computer device reads the computer programs / instructions 1110 from the computer-readable storage medium, and the processor executes the computer programs / instructions 1110, so that the computer device executes the method described in the above method embodiment.

[0282] 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 represent the difference between the current temperature of the electrolyte and the reference temperature, and obtains the initial injection density of the electrolyte and the change amount of the density per unit temperature. According to the target injection amount of the battery cell, the injection temperature deviation, the initial injection density, and the change amount of the density per unit temperature, the current injection amount deviation of the battery cell is determined. The target injection amount is used to represent the injection amount of the electrolyte to be injected into the battery cell, and the current injection amount deviation is used to represent the deviation of the injection amount caused by the current temperature change. Then, the current injection amount deviation is sent to the injection pump, so that the injection pump performs injection compensation on the battery cell according to the current injection amount deviation. During the injection process of the battery cell, injection compensation is performed on the battery cell based on the injection temperature deviation of the electrolyte, which reduces the problem that the injection amount deviates due to the change of the injection temperature and is beneficial to improving the battery performance.

[0283] Furthermore, calculating the injection amount deviation based on the injection amount of the battery cell, the injection temperature deviation of the electrolyte, the initial injection density, and the change amount of the density per unit temperature improves the calculation accuracy of the injection amount deviation.

[0284] 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 them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and 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 the liquid injection of an electric cell, characterized in that, Including: Determine the injection temperature deviation of the electrolyte to be injected into the battery cell, where the injection temperature deviation is used to characterize the difference between the current temperature of the electrolyte and the reference temperature; According to the electrolyte identification of the electrolyte, search a preset electrolyte parameter table to obtain the initial injection density and the unit temperature density change amount of the electrolyte; wherein, the preset electrolyte parameter table is used to characterize the correspondence between the electrolyte identification and the initial injection density and the unit temperature density change amount, the initial injection density is the density of the electrolyte at the reference temperature, and the unit temperature density change amount is used to characterize the correspondence between the unit temperature change and the density change; According to the target injection amount of the battery cell, the injection temperature deviation, the initial injection density and the unit temperature density change amount, determine the current injection amount deviation of the battery cell, where 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; Send the current injection amount deviation to the injection pump, so that the injection pump performs injection compensation on the battery cell according to the current injection amount deviation; The method further includes: Collect the temperature of the electrolyte at the initial moment to obtain the initial temperature; Establish the reference temperature according to the initial temperature; The establishing the reference temperature according to the initial temperature includes: Judge 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, determine the initial temperature as the reference temperature; The initial temperature includes a first sub-temperature and a second sub-temperature, and the first sub-temperature and the second sub-temperature are the temperatures at different positions of the same cross-section of the injection pipeline, and the injection pipeline is used to transport the electrolyte; The judging whether the initial temperature is within a preset temperature range includes: Calculate the temperature difference between the first sub-temperature and the second sub-temperature; In the case where it is determined that the temperature difference is less than or equal to the temperature difference threshold, judge whether the first sub-temperature and the second sub-temperature are within the preset temperature range; In the case where 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.

2. The method according to claim 1, wherein The method further includes: Obtain the weight of the battery cell; Determine the target injection amount according to the target weight and the weight of the battery cell.

3. The method according to claim 1, wherein The determining the injection temperature deviation of the electrolyte to be injected into the battery cell includes: Collect the temperature of the electrolyte at the current moment to obtain the current temperature; Calculate the injection temperature deviation according to the reference temperature and the current temperature.

4. The method according to any one of claims 1 to 3, characterized in that, The sending the current injection amount deviation to the injection pump includes: Judge whether the current injection amount deviation is within a preset deviation range; In the case where it is determined that the current injection amount deviation is within the preset deviation range, send the current injection amount deviation to the injection pump.

5. The method according to claim 4, wherein The sending the current injection amount deviation to the injection pump includes: Calculate the deviation sum of the historical liquid injection volume deviation and the current liquid injection volume deviation to obtain the cumulative liquid injection volume deviation; Determine whether the cumulative liquid injection volume deviation is within a preset cumulative deviation range; In the case where it is determined that the cumulative liquid injection volume deviation is within the preset cumulative deviation range, send the current liquid injection volume deviation to the liquid injection pump.

6. The method according to claim 5, wherein The method further includes: Update the historical liquid injection volume deviation to the cumulative liquid injection volume deviation; Return to execute the determination of the liquid injection temperature deviation of the electrolyte to be injected into the battery cell.

7. A liquid injection control device for an electric core, characterized in that, It includes: A first determination module, configured to determine the liquid injection temperature deviation of the electrolyte to be injected into the battery cell, where the liquid injection temperature deviation is used to characterize the difference between the current temperature of the electrolyte and the reference temperature; A first acquisition module, configured to look up a preset electrolyte parameter table according to the electrolyte identifier of the electrolyte, and acquire the initial liquid injection density and the unit temperature density change amount of the electrolyte; wherein, the preset electrolyte parameter table is used to characterize the correspondence between the electrolyte identifier and the initial liquid injection density and the unit temperature density change amount, the initial liquid injection density is the density of the electrolyte at the reference temperature, and the unit temperature density change amount is used to characterize the correspondence between the unit temperature change and the density change; A second determination module, configured to determine the current liquid injection volume deviation of the battery cell according to the target liquid injection volume of the battery cell, the liquid injection temperature deviation, the initial liquid injection density, and the unit temperature density change amount, where the target liquid injection volume is used to characterize the liquid injection volume of the electrolyte to be injected into the battery cell, and the current liquid injection volume deviation is used to characterize the deviation of the liquid injection volume caused by the current temperature change; A first sending module, configured to send the current liquid injection volume deviation to the liquid injection pump, so that the liquid injection pump performs liquid injection compensation on the battery cell according to the current liquid injection volume deviation; The liquid injection control device of the battery cell further includes an acquisition module and an establishment module; The acquisition module is configured to collect the temperature of the electrolyte at the initial moment to obtain the initial temperature; The establishment module is configured to establish the reference temperature according to the initial temperature; The establishment module includes a judgment unit and a determination unit; The judgment unit is configured to judge whether the initial temperature is within a preset temperature range; The determination unit is configured to, in the case where it is determined that the initial temperature is within the preset temperature range, determine the initial temperature as the reference temperature; The initial temperature includes a first sub-temperature and a second sub-temperature, and the first sub-temperature and the second sub-temperature are the temperatures at different positions of the same cross-section of the liquid injection pipeline, and the liquid injection pipeline is used to transport the electrolyte; The judgment unit includes a first calculation sub-unit and a first judgment sub-unit; The first calculation sub-unit is configured to calculate the temperature difference between the first sub-temperature and the second sub-temperature; The first judgment sub-unit is configured to, in the case where it is determined that the temperature difference is less than or equal to the temperature difference threshold, judge whether the first sub-temperature and the second sub-temperature are within the preset temperature range; The determination unit includes a determination sub-unit; The determining subunit is 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 the preset temperature range.

8. An injection system for an electric cell, characterized in that, It includes a liquid storage tank, a liquid injection pump, and a control device. The liquid storage tank is used to store the electrolyte. The control device is configured to determine the liquid injection temperature deviation of the electrolyte to be injected into the battery cell, look up a preset electrolyte parameter table according to the electrolyte identifier of the electrolyte, obtain the initial liquid injection density and the unit temperature density change amount of the electrolyte, and determine the current liquid injection amount deviation of the battery cell according to the target liquid injection amount of the battery cell, the liquid injection temperature deviation, the initial liquid injection density, and the unit temperature density change amount, and send the current liquid injection amount deviation to the liquid injection pump. The liquid injection temperature deviation is used to represent the difference between the current temperature of the electrolyte and the reference temperature. The target liquid injection amount is used to represent the liquid injection amount of the electrolyte to be injected into the battery cell. The current liquid injection amount deviation is used to represent the deviation of the liquid injection amount caused by the current temperature change. Wherein, the preset electrolyte parameter table is used to represent the correspondence between the electrolyte identifier and the initial liquid injection density and the unit temperature density change amount. The initial liquid injection density is the density of the electrolyte at the reference temperature. The unit temperature density change amount is used to represent the correspondence between the unit temperature change and the density change. The liquid injection pump is configured to inject the electrolyte from the liquid storage tank into the battery cell according to the current liquid injection amount deviation. The liquid injection system of the battery cell is further configured to: Collect the temperature of the electrolyte at the initial moment to obtain the initial temperature. Establish the reference temperature according to the initial temperature. The establishing the reference temperature according to the initial temperature includes: Judge whether the initial temperature is within the preset temperature range. When it is determined that the initial temperature is within the preset temperature range, determine the initial temperature as the reference temperature. The initial temperature includes a first sub-temperature and a second sub-temperature. The first sub-temperature and the second sub-temperature are the temperatures at different positions of the same cross-section of the liquid injection pipeline. The liquid injection pipeline is used to transport the electrolyte. The judging whether the initial temperature is within the preset temperature range includes: Calculate the 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, judge whether the first sub-temperature and the second sub-temperature are within the preset temperature range. 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.

9. An electronic device, characterized in that, It includes: A 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 are configured to be executed by the one or more processors. The one or more applications are configured to execute the method according to any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores program code, and the program code can be called by a processor to execute the method according to any one of claims 1 to 6.

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