Battery filling method, device, electronic device and storage medium

Abstract

The present application discloses a battery injection method, device, electronic device and storage medium, the method comprising: determining an index parameter affecting the injection accuracy; adjusting the injection coefficient according to the index parameter, the injection coefficient being a coefficient positively correlated with the electrolyte density; and controlling the electrolyte injection into the battery cell based on the adjusted injection coefficient. By determining the index parameter affecting the injection accuracy, the currently used injection coefficient is automatically adjusted, so that the adjusted injection coefficient is used to control the electrolyte injection into the battery cell, so as to reduce the injection amount error and achieve the effect of improving the injection accuracy.

Description

Technical Field

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

[0002] In the battery production process, the injection of electrolyte is a very critical step. Too little electrolyte injected will affect the battery performance and cycle life, and too much electrolyte injected will cause battery overflow and pollution. Therefore, the injection accuracy is the main indicator requirement in the battery injection process. Usually, the factors affecting the injection accuracy include the accuracy of the injection pump, the loss during the injection process (such as pipeline leakage, residue, evaporation), and the electrolyte temperature, among which the electrolyte temperature is the key factor affecting the injection accuracy.

[0003] Currently, most solutions are to add additional electrolyte heating structures to keep the electrolyte temperature relatively stable.

[0004] However, the use of an electrolyte heating structure not only makes the system relatively complex, but also in the summer, due to the high ambient temperature, the electrolyte temperature is also relatively high, but the heating structure can only heat the electrolyte but cannot cool it down, so that the electrolyte temperature cannot be kept relatively stable, the temperature fluctuation range is relatively large, and the injection accuracy is relatively low.

[0005] The above statements are only used to provide background information related to the present application and do not necessarily constitute prior art. Summary of the invention

[0006] In view of the above problems, the present application proposes a battery filling method, device, electronic device and storage medium to solve the problem of low electrolyte filling accuracy during the battery manufacturing process.

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

[0008] Determine the index parameters that affect the injection accuracy;

[0009] Adjusting the injection coefficient according to the index parameter, wherein the injection coefficient is a coefficient that is positively correlated with the electrolyte density;

[0010] The electrolyte injection into the battery cell is controlled based on the adjusted injection coefficient.

[0011] In the technical solution of the embodiment of the present application, by determining the index parameters that affect the injection accuracy, the currently used injection coefficient is automatically adjusted, and the adjusted injection coefficient is used to control the injection of electrolyte into the battery cell to reduce the injection volume error and achieve the effect of improving the injection accuracy.

[0012] In some embodiments, determining the index parameter affecting the injection accuracy includes:

[0013] Obtain the current electrolyte temperature in the electrolyte buffer tank; determine the electrolyte density corresponding to the current electrolyte temperature according to a preset temperature-density relationship; determine the electrolyte temperature correction coefficient using the electrolyte density corresponding to the currently obtained electrolyte temperature and the electrolyte density corresponding to the last obtained electrolyte temperature; and use the electrolyte temperature correction coefficient as an indicator parameter affecting the injection accuracy.

[0014] In this embodiment, the electrolyte temperature is acquired in real time, and the functional relationship between temperature and electrolyte density is used to obtain the electrolyte density corresponding to the electrolyte temperature. Thus, the electrolyte temperature correction coefficient is obtained by using the electrolyte density of the electrolyte temperature acquired twice before and after, which is used as an indicator parameter affecting the injection accuracy, so as to facilitate the subsequent determination of appropriate injection process parameters.

[0015] In some embodiments, determining the electrolyte temperature correction coefficient using the electrolyte density corresponding to the currently obtained electrolyte temperature and the electrolyte density corresponding to the last obtained electrolyte temperature includes:

[0016] Determine the electrolyte density difference between the electrolyte density corresponding to the currently obtained electrolyte temperature and the electrolyte density corresponding to the last obtained electrolyte temperature; divide the electrolyte density difference by the electrolyte density corresponding to the last obtained electrolyte temperature to obtain the electrolyte temperature correction coefficient.

[0017] In this embodiment, the change in electrolyte density caused by two changes in electrolyte temperature, that is, the electrolyte density difference, is obtained, and the electrolyte density difference is divided by the previous electrolyte density to obtain the degree of change in electrolyte density. The degree of change in electrolyte density is then used as the electrolyte temperature correction coefficient to reflect the degree of influence of temperature fluctuations on electrolyte density.

[0018] In some embodiments, obtaining the current electrolyte temperature in the electrolyte cache tank includes:

[0019] Acquire multiple temperature values ​​continuously collected by the temperature collector on the electrolyte cache tank within a preset time period; eliminate abnormal points among the multiple temperature values; the abnormal points are values ​​that are not within the preset temperature range and / or values ​​that are greater than the interquartile range of the multiple temperature values; and use the average value of the eliminated temperature values ​​as the current electrolyte temperature.

[0020] In this embodiment, the temperature value of a period of time is continuously collected by using the temperature collector on the electrolyte buffer tank, and the abnormal points are eliminated to avoid the influence of the abnormal points on the test results. Then, the average of the temperature values ​​after elimination is used as the current electrolyte temperature. This can avoid the error caused by using a single collection value and improve the accuracy of the electrolyte temperature.

[0021] In some embodiments, when the indicator parameter is an electrolyte temperature correction coefficient, adjusting the injection coefficient according to the indicator parameter includes:

[0022] Determine the product between the index parameter and the injection coefficient; and use the sum of the product and the injection coefficient as the adjusted injection coefficient.

[0023] In this embodiment, the product of the electrolyte temperature correction coefficient and the currently used injection coefficient is taken as the adjusted injection coefficient, so as to achieve the effect of reducing the injection coefficient when the electrolyte temperature increases and increasing the injection coefficient when the electrolyte temperature decreases. The injection coefficient is automatically corrected as the electrolyte temperature changes, thereby reducing the injection error caused by the electrolyte temperature change.

[0024] In some embodiments, determining the index parameter affecting the injection accuracy includes:

[0025] Determine the injection volume difference caused by the previous round of injection; when the injection volume difference is greater than a threshold value, determine the injection volume difference correction coefficient using the injection volume difference and the target injection volume; the target injection volume is the theoretical injection volume set for the battery cell; and use the injection volume difference correction coefficient as an indicator parameter affecting the injection accuracy.

[0026] In this embodiment, by determining the injection volume difference caused by the previous round of injection, when the injection volume difference reaches a certain level, the injection volume difference and the target injection volume are used to obtain the injection volume difference correction coefficient as an indicator parameter affecting the injection accuracy, so as to reflect the degree of difference in the injection volume difference relative to the target injection volume, thereby facilitating the subsequent determination of appropriate injection process parameters.

[0027] In some embodiments, determining the difference in injection volume generated by the current round of injection includes:

[0028] Obtain the injection error of each battery cell that completed the previous round of injection; the injection error is the difference between the actual injection amount of the battery cell and the target injection amount; eliminate abnormal points in the injection error; the abnormal points include values ​​that are not within a preset value range; and take the average value of the injection errors after elimination as the injection amount difference.

[0029] In this embodiment, the injection errors of each battery cell when the previous round of injection is completed are obtained, and the abnormal points are eliminated, and then the mean of the injection errors after elimination is used as the injection amount difference generated by this round of injection to improve the accuracy of the injection amount difference.

[0030] In some embodiments, when the indicator parameter is an injection volume difference correction coefficient, adjusting the injection coefficient according to the indicator parameter includes:

[0031] Determine the product between the index parameter and the injection coefficient; and use the difference between the injection coefficient and the product as the adjusted injection coefficient.

[0032] In this embodiment, the product of the injection volume difference correction coefficient and the currently used injection coefficient is used as the difference between the product and the currently used injection coefficient as the adjusted injection coefficient to eliminate the influence of the injection volume difference correction coefficient. The injection coefficient is automatically corrected following the injection volume difference, so that accurate injection coefficient can be used for injection to improve injection accuracy.

[0033] In some embodiments, controlling the electrolyte injection into the battery cell based on the adjusted injection coefficient includes:

[0034] The target injection volume is determined by using the adjusted injection coefficient and the target injection amount; and the injection pump is controlled to extract the electrolyte of the target injection volume from the electrolyte buffer tank and inject it into the battery cell.

[0035] In this embodiment, the volume of electrolyte to be injected is determined by using the adjusted injection coefficient and the target injection volume, so that the injection pump is controlled to extract the corresponding volume of electrolyte and inject it into the battery cell, thereby achieving the effect of keeping the actual injection volume consistent with the target injection volume.

[0036] A second aspect of the present application provides a battery liquid injection device, the device comprising:

[0037] A parameter determination module is used to determine the index parameters that affect the injection accuracy;

[0038] An adjustment module, used for adjusting the injection coefficient according to the index parameter, wherein the injection coefficient is a coefficient positively correlated with the electrolyte density;

[0039] The injection module is used to control the injection of electrolyte into the battery cell based on the adjusted injection coefficient.

[0040] The third aspect of the present application proposes an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method described in the first aspect when executing the program.

[0041] The fourth aspect of the present application proposes a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method described in the first aspect above.

[0042] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0044] Figure 1 The present invention is a flow chart of an embodiment of a battery liquid filling method according to an exemplary embodiment;

[0045] Figure 2 is a schematic diagram showing the relationship between electrolyte temperature and electrolyte density according to an exemplary embodiment;

[0046] Figure 3 is a schematic diagram showing periodic changes of injection volume over time according to an exemplary embodiment;

[0047] Figure 4 is a flowchart showing an implementation of automatically correcting a liquid injection coefficient as electrolyte temperature changes according to an exemplary embodiment;

[0048] Figure 5 is a schematic diagram showing the change of injection volume over time after the injection coefficient is corrected according to an exemplary embodiment;

[0049] Figure 6 is a flowchart showing an implementation of automatic correction of a liquid injection coefficient according to a liquid injection difference according to an exemplary embodiment;

[0050] Figure 7 is another schematic diagram showing changes of injection volume over time after correction of injection coefficient according to an exemplary embodiment;

[0051] Figure 8 is a schematic structural diagram of a battery liquid filling device according to an exemplary embodiment;

[0052] Fig. 9 is a schematic diagram of a hardware structure of an electronic device according to an exemplary embodiment;

[0053] Fig.10 The figure is a schematic diagram of the structure of a storage medium according to an exemplary embodiment. DETAILED DESCRIPTION

[0054] The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0056] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0057] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0058] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0059] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0060] In the field of battery production, it is necessary to inject electrolyte into the battery cell to allow the electrolyte to react chemically with the substances in the battery cell so that the battery cell has a certain charge and discharge capacity. Depending on the design of the battery cell, each type of battery cell has its set theoretical injection volume, so quantitative injection is usually used for injection.

[0061] At present, the commonly used quantitative injection method is to achieve quantitative injection by controlling the volume of the electrolyte. The principle of achieving quantitative injection by controlling the volume is: according to the type of battery cell, the theoretical injection volume m is set in the injection equipment, and the injection coefficient ρ is set. The injection coefficient ρ is a coefficient obtained through experimental testing based on the electrolyte density and the error of the injection equipment. It is believed that as long as the electrolyte temperature is within a certain range, the electrolyte density is basically constant. The injection equipment calculates the volume V=m / ρ that needs to be injected into the battery cell based on the set injection coefficient ρ and the theoretical injection volume m, and then the injection pump draws V milliliters of electrolyte from the electrolyte buffer tank and injects it into the battery cell to complete the injection of one battery cell.

[0062] Due to the influence of factors such as the accuracy of the injection pump, the loss during the injection process, and the electrolyte temperature, under normal circumstances, by weighing the weight of the battery cell m1 before injection and weighing the weight of the battery cell m2 after injection, and calculating the actual injection volume mx=m2-m1, it is found that there is a relatively large difference between the actual injection volume mx and the theoretical injection volume m. The larger the difference, the lower the injection accuracy.

[0063] Considering that the electrolyte temperature is a key factor affecting the injection accuracy, most of the existing solutions are to add an electrolyte heating structure to the electrolyte buffer tank to keep the electrolyte temperature in the electrolyte buffer tank relatively stable.

[0064] However, the use of a heating structure to heat the electrolyte makes the system relatively complex and costly. In addition, it can only heat the electrolyte but not cool it down. The high ambient temperature in summer will make it impossible for the electrolyte temperature to remain relatively stable, and the temperature fluctuation range is relatively large, resulting in relatively low injection accuracy.

[0065] In order to solve the above technical problems, the present application proposes a battery filling method. Without increasing the hardware cost, the currently used filling coefficient is automatically adjusted by determining the indicator parameters affecting the filling accuracy, so that the adjusted filling coefficient is used to control the injection of electrolyte into the battery cell, so that the actual filling volume is consistent with the set theoretical filling volume, thereby achieving the effect of improving the filling accuracy.

[0066] The battery injection method disclosed in the embodiment of the present application can be used in, but not limited to, the production process of batteries, and of course can also be used in the production process of other products to achieve quantitative control of the solution in the production process, so as to monitor and improve the quality of the product.

[0067] The battery described above can be any one of a cylindrical lithium-ion battery, a square lithium-ion battery and a soft-pack battery.

[0068] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0069] Figure 1 This is a flow chart of an embodiment of a battery filling method according to an exemplary embodiment of the present application. The battery filling method includes the following steps:

[0070] Step 101: Determine index parameters affecting injection accuracy;

[0071] Step 102: adjusting the injection coefficient according to the index parameter, where the injection coefficient is a coefficient that is positively correlated with the electrolyte density;

[0072] Step 103: Control the injection of electrolyte into the battery cell based on the adjusted injection coefficient.

[0073] The index parameter can be understood as the index data obtained from the electrolyte property parameter or the injection parameter, and the index parameter is used to correct the injection coefficient currently used to accurately set the injection coefficient. For example, considering that the factors affecting the injection accuracy include electrolyte temperature, injection pump accuracy, and injection process loss, the index parameter can include the index data obtained from the change of electrolyte temperature and the index data obtained from the injection volume difference generated during the injection process.

[0074] The injection coefficient can be understood as an injection process parameter that the injection equipment needs to use when completing each round of injection.

[0075] Illustratively, the injection coefficient used in the first round of injection after the injection equipment is turned on is the initially set injection coefficient ρ0. The injection equipment uses the injection coefficient ρ0 and the theoretical injection volume m to calculate the volume V=m / ρ0 that needs to be injected into the battery cell. The injection pump draws V milliliters of electrolyte from the electrolyte buffer tank and injects it into the battery cell. In subsequent rounds of injection, the index parameters that affect the injection accuracy are determined in real time, and the currently used injection coefficient is automatically adjusted according to the index parameters. The adjusted injection coefficient ρx and the theoretical injection volume m are used to calculate the electrolyte volume Vx=m / ρx that needs to be injected into the battery cell, and the electrolyte is injected.

[0076] It can be seen from the above electrolyte volume calculation formula that the density formula is used, but considering the error of the injection equipment, the injection coefficient is not equivalent to the electrolyte density. Therefore, the injection coefficient is a coefficient that is positively correlated with the electrolyte density. That is to say, the greater the electrolyte density, the greater the injection coefficient.

[0077] It is worth noting here that the initially set injection coefficient ρ0 is a coefficient obtained through experimental testing based on the electrolyte density and injection equipment error.

[0078] At this point, the above Figure 1The battery filling process shown in the figure automatically adjusts the currently used filling coefficient by determining the index parameters affecting the filling accuracy, so as to control the electrolyte injection into the battery cell using the adjusted filling coefficient to reduce the filling amount error and achieve the effect of improving the filling accuracy.

[0079] In some optional implementations of the present application, the above step 101 determines the index parameters affecting the injection accuracy, including:

[0080] The current electrolyte temperature in the electrolyte buffer tank is obtained, and the electrolyte density corresponding to the current electrolyte temperature is determined according to a preset temperature-density relationship. The electrolyte temperature correction coefficient is determined using the electrolyte density corresponding to the currently obtained electrolyte temperature and the electrolyte density corresponding to the last obtained electrolyte temperature, so that the electrolyte temperature correction coefficient is used as an indicator parameter affecting the injection accuracy.

[0081] The electrolyte buffer tank can be understood as a liquid storage device used to store electrolyte in the liquid injection equipment. The electrolyte flows from the electrolyte room along the transmission pipeline into the electrolyte buffer tank in the workshop liquid injection equipment for use. Therefore, the electrolyte buffer tank is the closest electrolyte storage link before the electrolyte is injected into the battery cell. The electrolyte temperature is uncontrolled and is greatly affected by the ambient temperature.

[0082] The relationship between temperature and density is the functional relationship f(T) between the electrolyte temperature T and the electrolyte density ρ. Figure 2 As shown, the change of electrolyte temperature causes the change of electrolyte density ρ. By setting the electrolyte temperature to x and the electrolyte density ρ to y, and using the (x, y) points obtained by multiple sets of tests for fitting, the linear relationship between electrolyte temperature and electrolyte density y=-0.0012x+1.1728 is obtained.

[0083] The electrolyte temperature correction coefficient can be understood as a coefficient used to correct the electrolyte temperature change that reduces the injection accuracy. After the electrolyte temperature correction coefficient is used as an indicator parameter to act on the injection coefficient, the injection coefficient can be adjusted along with the electrolyte temperature change.

[0084] By the above Figure 2 It can be seen that as the electrolyte temperature increases, the electrolyte density tends to decrease. Within a day, the ambient temperature is highest at noon and lowest at dawn. Correspondingly, the electrolyte temperature is affected by the ambient temperature, and is also highest at noon and lowest at dawn. It can be seen that the electrolyte temperature changes periodically over time. If the existing injection scheme is used, the electrolyte injection amount affected by the electrolyte temperature change also changes periodically over time. See Figure 3As shown, the horizontal axis represents time, and the vertical axis represents the electrolyte injection volume. At around 12:00 noon, the ambient temperature is the highest and the actual electrolyte density is the lowest. When the injection coefficient set on the injection equipment remains unchanged, the actual injection volume remains unchanged, resulting in a smaller actual injection weight and a lower injection accuracy. On the contrary, at around 00:00 in the early morning, the ambient temperature is the lowest and the actual electrolyte density is the highest, resulting in a larger actual injection weight and a lower injection accuracy.

[0085] Taking into account the slow nature of the effect of ambient temperature on electrolyte temperature, illustratively, the electrolyte temperature in the electrolyte buffer tank is obtained once every 10 minutes, and the electrolyte density corresponding to the two adjacent electrolyte temperatures obtained is determined, thereby using the electrolyte density 10 minutes apart to calculate the electrolyte temperature correction coefficient.

[0086] In this embodiment, the electrolyte temperature is acquired in real time, and the functional relationship between temperature and electrolyte density is used to obtain the electrolyte density corresponding to the electrolyte temperature. Thus, the electrolyte temperature correction coefficient is obtained by using the electrolyte density of the electrolyte temperature acquired twice before and after, which is used as an indicator parameter affecting the injection accuracy, so as to facilitate the subsequent determination of appropriate injection process parameters.

[0087] In an optional implementation, the process of determining the electrolyte temperature correction coefficient using the electrolyte density corresponding to the currently obtained electrolyte temperature and the electrolyte density corresponding to the last obtained electrolyte temperature includes:

[0088] The electrolyte density difference between the electrolyte density corresponding to the currently obtained electrolyte temperature and the electrolyte density corresponding to the last obtained electrolyte temperature is determined, and then the electrolyte density difference is divided by the electrolyte density corresponding to the last obtained electrolyte temperature to obtain the electrolyte temperature correction coefficient.

[0089] Assume that the electrolyte density corresponding to the current electrolyte temperature is , the electrolyte density corresponding to the electrolyte temperature obtained last time is , the calculation formula of electrolyte temperature correction coefficient μ is as follows:

[0090] Formula 1

[0091] In this embodiment, the change in electrolyte density caused by two changes in electrolyte temperature, that is, the electrolyte density difference, is obtained, and the electrolyte density difference is divided by the previous electrolyte density to obtain the degree of change in electrolyte density. The degree of change in electrolyte density is then used as the electrolyte temperature correction coefficient to reflect the degree of influence of temperature fluctuations on electrolyte density.

[0092] In an optional implementation, obtaining the current electrolyte temperature in the electrolyte buffer tank includes:

[0093] Acquire multiple temperature values ​​continuously collected by the temperature collector on the electrolyte buffer tank within a preset time period, remove abnormal points from the multiple temperature values, and then use the average value of the removed temperature values ​​as the current electrolyte temperature.

[0094] When collecting the electrolyte temperature, the temperature collector can be inserted into the electrolyte buffer tank or can be closely attached to the outer wall of the electrolyte buffer tank.

[0095] The preset time period can be understood as the interval time for obtaining the electrolyte temperature each time, for example, 10 minutes. The temperature collector collects temperature values ​​at a certain sampling frequency within the time period to obtain multiple temperature values.

[0096] The abnormal point is a temperature value that is impossible for the electrolyte to appear, which includes a value that is not within the preset temperature range and / or a value that is greater than the interquartile range (IQR) of multiple temperature values. The preset temperature range can be understood as the normal fluctuation range of the electrolyte temperature, such as 0℃-50℃.

[0097] In this embodiment, the temperature value of a period of time is continuously collected by using the temperature collector on the electrolyte buffer tank, and the abnormal points are eliminated to avoid the influence of the abnormal points on the test results. Then, the average of the temperature values ​​after elimination is used as the current electrolyte temperature. This can avoid the error caused by using a single collection value and improve the accuracy of the electrolyte temperature.

[0098] In an optional implementation, when the indicator parameter is the electrolyte temperature correction coefficient, the step 102 adjusts the injection coefficient according to the indicator parameter, including:

[0099] The product between the index parameter and the injection coefficient is determined, and then the sum of the product and the injection coefficient is used as the adjusted injection coefficient.

[0100] Assuming that the electrolyte temperature correction coefficient is μ, the current injection coefficient is , adjusted injection coefficient The calculation formula is as follows:

[0101] Formula 2

[0102] In this embodiment, the product of the electrolyte temperature correction coefficient and the currently used injection coefficient is taken as the adjusted injection coefficient, so as to achieve the effect of reducing the injection coefficient when the electrolyte temperature increases and increasing the injection coefficient when the electrolyte temperature decreases. The injection coefficient is automatically corrected as the electrolyte temperature changes, thereby reducing the injection error caused by the electrolyte temperature change.

[0103] In some other optional embodiments of the present application, the above step 101 determines the index parameters affecting the injection accuracy, including:

[0104] Determine the injection volume difference caused by the previous round of injection. When the injection volume difference is greater than a threshold, use the injection volume difference and the target injection volume to determine the injection volume difference correction coefficient, and then use the injection volume difference correction coefficient as an indicator parameter affecting the injection accuracy.

[0105] The difference in injection volume can be understood as the injection error of the injection equipment in completing a round of injection. The greater the difference in injection volume, the lower the injection accuracy. Among them, "a round of injection" refers to the process of completing the injection of multiple battery cells displayed on the injection tray of the injection equipment.

[0106] The threshold value can be understood as the maximum injection volume difference that the injection device can tolerate. If the injection volume difference is greater than the threshold value, it means that the injection deviation is large and needs to be corrected. The threshold value can be pre-set based on practical experience, for example, set to 3g.

[0107] The target injection volume can be understood as the theoretical injection volume set in the injection equipment, which is an injection process parameter that the injection equipment needs to use when completing each round of injection.

[0108] Since the injection error is affected by the accuracy of the injection pump and the loss of the injection process in addition to the change in electrolyte temperature, the injection volume difference correction coefficient can be understood as a coefficient used to correct the loss of the injection process and the influence of the accuracy of the injection pump. After the injection volume difference correction coefficient is used as an indicator parameter to act on the injection coefficient, the consistency between the actual injection volume and the target injection volume can be maintained.

[0109] Exemplarily, assuming that the threshold is 3g, when the injection volume difference △m generated by the previous round of injection is 6g, since △m>3g, it is necessary to use the injection volume difference △m and the target injection volume to determine the injection volume difference correction coefficient.

[0110] The injection volume difference and the target injection volume are used to determine the injection volume difference correction coefficient, and the calculation formula is:

[0111] η=(△m) / mFormula 3

[0112] In the above formula, η is the injection volume difference correction coefficient, △m is the injection volume difference, and m is the target injection volume.

[0113] In this embodiment, by determining the injection volume difference caused by the previous round of injection, when the injection volume difference reaches a certain level, the injection volume difference and the target injection volume are used to obtain the injection volume difference correction coefficient as an indicator parameter affecting the injection accuracy, so as to reflect the degree of difference in the injection volume difference relative to the target injection volume, thereby facilitating the subsequent determination of appropriate injection process parameters.

[0114] In an optional implementation, determining the difference in injection volume generated by the current round of injection includes:

[0115] The injection errors of each battery cell that completed the injection in the previous round are obtained, the abnormal points in the injection errors are eliminated, and then the average value of the injection errors after elimination is used as the injection amount difference.

[0116] The injection error is the difference between the actual injection amount and the target injection amount of the battery cell. The target injection amount is the theoretical injection amount set in the injection equipment, and the actual injection amount is the weight of the electrolyte actually injected into the battery cell. By weighing the weight of the battery cell before injection, m1, and the weight of the battery cell after injection, m2, the actual injection amount of the battery cell, mx=m2-m1.

[0117] The abnormal point belongs to the injection error that is impossible to occur, which includes a value that is not within the preset value range. The preset value range can be understood as the fluctuation range of the injection error, for example, -10g to 10g.

[0118] In this embodiment, the injection errors of each battery cell when the previous round of injection is completed are obtained, and the abnormal points are eliminated, and then the mean of the injection errors after elimination is used as the injection amount difference generated by this round of injection to improve the accuracy of the injection amount difference.

[0119] In an optional implementation, when the indicator parameter is the injection volume difference correction coefficient, the injection coefficient is adjusted according to the indicator parameter in the above step 102, including:

[0120] The product between the index parameter and the injection coefficient is determined, and then the difference between the injection coefficient and the product is used as the adjusted injection coefficient.

[0121] Assuming that the correction coefficient of injection volume difference is η, the current injection coefficient is , adjusted injection coefficient The calculation formula is as follows:

[0122] Formula 4

[0123] In this embodiment, the product of the injection volume difference correction coefficient and the currently used injection coefficient is used as the difference between the product and the currently used injection coefficient as the adjusted injection coefficient to eliminate the influence of the injection volume difference correction coefficient. The injection coefficient is automatically corrected following the injection volume difference, so that accurate injection coefficient can be used for injection to improve injection accuracy.

[0124] It should be noted here that the above formulas 1 to 4 are only specific calculation formulas given in this application, but this does not constitute a limitation on the protection scope of this application. Other calculation formulas can also be designed using relevant parameters as long as the corresponding calculation target requirements can be met.

[0125] In an optional implementation, the step 103 controls the electrolyte injection into the battery cell based on the adjusted injection coefficient, including:

[0126] The target injection volume is determined using the adjusted injection coefficient and the target injection amount, and the injection pump is controlled to draw electrolyte of the target injection volume from the electrolyte buffer tank and inject it into the battery cell.

[0127] The injection pump can be understood as a device that extracts electrolyte from the electrolyte buffer tank and injects it into the battery cell. By sending the injection volume to the injection pump, the corresponding volume of electrolyte can be injected into the battery cell.

[0128] Assume that the adjusted injection coefficient is , the target injection volume is m, and the calculation formula of the target injection volume V is as follows:

[0129] V=m / Formula 5

[0130] In this embodiment, the volume of electrolyte to be injected is determined by using the adjusted injection coefficient and the target injection volume, so that the injection pump is controlled to extract the corresponding volume of electrolyte and inject it into the battery cell, thereby achieving the effect of keeping the actual injection volume consistent with the target injection volume.

[0131] Based on the description of the above embodiments, two specific embodiments are described below, namely, automatic correction of the injection coefficient with changes in electrolyte temperature and automatic correction of the injection coefficient with injection differences.

[0132] See also Figure 4 As shown, it is a flow chart for realizing automatic correction of the injection coefficient as the electrolyte temperature changes. The temperature of the electrolyte is collected in real time by placing a temperature probe close to the outer wall of the electrolyte buffer tank or inserting it into the electrolyte buffer tank, and the collected temperature data is transmitted to the host computer of the injection equipment (such as PLC (Programmable Logic Controller)).

[0133] Assume that the host computer of the injection equipment calculates the electrolyte temperature every 10 minutes, that is, it takes the received temperature data every 10 minutes, removes the abnormal points, calculates the temperature average value T', and then uses the temperature average value T' calculated twice before and after x and T' x+1 , calculate the electrolyte temperature correction coefficient μ by the above formula 1, and then use the electrolyte temperature correction coefficient μ and the current injection coefficient , calculate the adjusted injection coefficient using the above formula 2 , and finally use the adjusted injection coefficient The injection volume V is calculated by the above formula 5 and the data of the injection volume V is sent to the injection pump, thereby achieving the purpose of automatic real-time adjustment of the injection volume as the electrolyte temperature changes.

[0134] According to the above process, the upper computer of the injection equipment will automatically correct the injection coefficient every 10 minutes to reduce the impact of electrolyte temperature fluctuation on injection accuracy. Figure 5 As shown, the horizontal axis represents time, and the vertical axis represents the corrected electrolyte injection amount. Figure 5 It can be seen that the injection volume fluctuates over time. Compared with the above Figure 3 The periodic variation of the injection volume over time before correction is shown to be significantly improved.

[0135] See also Figure 6 As shown, this is a flow chart for realizing automatic correction of the injection coefficient with the injection difference. When the injection equipment executes each round of battery cell injection, for each battery cell, the injection weighing system will weigh the battery cell before injection and weigh the battery cell after injection to obtain the actual injection amount. The actual injection amount is subtracted from the target injection amount to obtain the injection error of the battery cell, and the injection error is transmitted to the upper computer of the injection equipment.

[0136] When the injection device completes a round of injection, the host computer of the injection device takes out the received injection error data, removes the abnormal points, and calculates the average value to obtain the injection volume difference △m' of this round of injection. When the injection volume difference △m' is greater than the preset threshold, the injection volume difference △m' and the target injection volume m are used to calculate the injection volume difference correction coefficient η through the above formula 3, and the injection volume difference correction coefficient η and the currently used injection coefficient are used. , calculate the adjusted injection coefficient using the above formula 4 , and finally use the adjusted injection coefficient The injection volume V is calculated by the above formula 5 and the data of the injection volume V is sent to the injection pump, so as to achieve the purpose of automatic real-time adjustment of the injection volume as the injection difference changes.

[0137] According to the above process, the upper computer of the injection equipment will determine the injection volume difference once each round of injection is completed. If the injection volume difference is greater than a certain threshold, the injection coefficient will be corrected once, otherwise, the injection coefficient will not be corrected. Figure 7 As shown, the horizontal axis represents time, and the vertical axis represents the corrected electrolyte injection amount. Figure 7 It can be seen that the change of injection volume over time is different from the above Figure 3 The periodic variation of the injection volume before correction as shown has also been significantly improved.

[0138] It should be noted that the embodiment of automatically correcting the injection coefficient with the change of electrolyte temperature and the embodiment of automatically correcting the injection coefficient with the injection difference can also be used together. That is, the injection coefficient is automatically corrected once according to the change of electrolyte temperature at fixed time intervals, and the injection amount difference is determined once after each round of injection. If the injection amount difference is greater than a certain threshold, the injection coefficient is corrected once.

[0139] The above description of various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced to each other, and for the sake of brevity, they will not be repeated herein.

[0140] Those skilled in the art will appreciate that, in the above method of a specific embodiment, the order in which the steps are written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of the steps should be determined by their functions and possible internal logic.

[0141] Corresponding to the above-mentioned embodiments of the battery filling method, the present application also provides embodiments of a battery filling device.

[0142] Figure 8 FIG. 1 is a schematic diagram of a battery liquid filling device according to an exemplary embodiment of the present application. The device is used to perform the battery liquid filling method provided in any of the above embodiments, such as Figure 8 As shown, the battery filling device comprises:

[0143] A parameter determination module 810 is used to determine the index parameters that affect the injection accuracy;

[0144] An adjustment module 820, configured to adjust a liquid injection coefficient according to the index parameter, wherein the liquid injection coefficient is a coefficient that is positively correlated with the electrolyte density;

[0145] The injection module 830 is used to control the injection of electrolyte into the battery cell based on the adjusted injection coefficient.

[0146] The implementation process of the functions and effects of each unit in the above-mentioned device is specifically described in the implementation process of the corresponding steps in the above-mentioned method, and will not be repeated here.

[0147] For the device embodiment, since it basically corresponds to the method embodiment, the relevant parts can refer to the partial description of the method embodiment. The device embodiment described above is only schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present application scheme. A person of ordinary skill in the art can understand and implement it without paying any creative work.

[0148] The embodiment of the present application also provides an electronic device corresponding to the battery filling method provided in the above embodiment, so as to execute the above battery filling method.

[0149] Fig. 9 This is a hardware structure diagram of an electronic device according to an exemplary embodiment of the present application, and the electronic device may include: a communication interface 601, a processor 602, a memory 603 and a bus 604; wherein the communication interface 601, the processor 602 and the memory 603 communicate with each other through the bus 604. The processor 602 can execute the battery filling method described above by reading and executing the machine executable instructions corresponding to the control logic of the battery filling method in the memory 603. The specific content of the method is referred to the above embodiment, and will not be repeated here.

[0150] The memory 603 mentioned in this application can be any electronic, magnetic, optical or other physical storage device, and can contain storage information, such as executable instructions, data, etc. Specifically, the memory 603 can be RAM (Random Access Memory), flash memory, storage drive (such as hard disk drive), any type of storage disk (such as optical disk, DVD, etc.), or similar storage medium, or a combination thereof. The communication connection between the system network element and at least one other network element is realized through at least one communication interface 601 (which can be wired or wireless), and the Internet, wide area network, local area network, metropolitan area network, etc. can be used.

[0151] The bus 604 may be an ISA bus, a PCI bus or an EISA bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The memory 603 is used to store programs, and the processor 602 executes the programs after receiving execution instructions.

[0152] The processor 602 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit or software instructions in the processor 602. The above processor 602 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the embodiments of the present application can be directly embodied as a hardware decoding processor to be executed, or the hardware and software modules in the decoding processor can be combined and executed.

[0153] The electronic device provided in the embodiment of the present application and the battery filling method provided in the embodiment of the present application are based on the same inventive concept and have the same beneficial effects as the methods adopted, operated or implemented therein.

[0154] The present application also provides a computer-readable storage medium corresponding to the battery filling method provided in the above embodiment. Fig.10 As shown, the computer-readable storage medium shown is a CD 30 on which a computer program (ie, a program product) is stored. When the computer program is run by a processor, the battery filling method provided in any of the aforementioned embodiments will be executed.

[0155] It should be noted that examples of the computer-readable storage medium may also include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other optical or magnetic storage media, which are not listed here one by one.

[0156] The computer-readable storage medium provided in the above-mentioned embodiments of the present application and the battery filling method provided in the embodiments of the present application are based on the same inventive concept and have the same beneficial effects as the methods adopted, run or implemented by the application programs stored therein.

[0157] An embodiment of the present application also provides a computer program product corresponding to the battery filling method provided in the aforementioned embodiment, including a computer program, which is executed by a processor to implement the battery filling method provided in any of the aforementioned embodiments.

[0158] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0159] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0160] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A battery filling method, characterized in that: The method comprises: Determine an index parameter affecting the injection accuracy, the index parameter including at least one of the following parameters: an electrolyte temperature correction coefficient and an injection volume difference correction coefficient, the electrolyte temperature correction coefficient is determined by the electrolyte density corresponding to the currently acquired electrolyte temperature and the electrolyte density corresponding to the last acquired electrolyte temperature, the injection volume difference correction coefficient is determined by the injection volume difference generated during the injection process and the target injection volume, the injection volume difference represents the difference between the actual injection volume of the battery cell and the target injection volume; The injection coefficient is adjusted according to the index parameter, and the injection coefficient is a coefficient that is positively correlated with the electrolyte density; the adjustment includes: taking the sum of the product between the electrolyte temperature correction coefficient and the injection coefficient and the injection coefficient as the adjusted injection coefficient, or taking the product between the injection volume difference correction coefficient and the injection coefficient and the difference between the injection coefficient and the injection coefficient as the adjusted injection coefficient; The target injection volume is determined based on the adjusted injection coefficient and the target injection amount, and the electrolyte of the target injection volume is injected into the battery cell.

2. The method according to claim 1, characterized in that The step of determining the index parameters affecting the injection accuracy includes: Get the current electrolyte temperature in the electrolyte cache tank; Determine the electrolyte density corresponding to the current electrolyte temperature according to a preset temperature-density relationship; Determine an electrolyte temperature correction coefficient using an electrolyte density corresponding to a currently obtained electrolyte temperature and an electrolyte density corresponding to a last obtained electrolyte temperature; The electrolyte temperature correction coefficient is used as an index parameter affecting the injection accuracy.

3. The method according to claim 2, characterized in that The method of determining the electrolyte temperature correction coefficient by using the electrolyte density corresponding to the currently obtained electrolyte temperature and the electrolyte density corresponding to the last obtained electrolyte temperature includes: Determine the electrolyte density difference between the electrolyte density corresponding to the currently obtained electrolyte temperature and the electrolyte density corresponding to the last obtained electrolyte temperature; The electrolyte temperature correction coefficient is obtained by dividing the electrolyte density difference by the electrolyte density corresponding to the electrolyte temperature obtained last time.

4. The method according to claim 2, characterized in that: The obtaining of the current electrolyte temperature in the electrolyte cache tank comprises: Acquire multiple temperature values ​​continuously collected by the temperature collector on the electrolyte buffer tank within a preset time period; Eliminate abnormal points from the multiple temperature values; the abnormal points are values ​​that are not within the preset temperature range and / or values ​​that are greater than the interquartile range of the multiple temperature values; The average value of the temperature values ​​after elimination is taken as the current electrolyte temperature.

5. The method according to claim 1, characterized in that The step of determining the index parameters affecting the injection accuracy includes: Determine the difference in injection volume from the previous injection round; In the case where the injection amount difference is greater than a threshold value, the injection amount difference correction coefficient is determined using the injection amount difference and a target injection amount; the target injection amount is a theoretical injection amount set for the battery cell; The injection volume difference correction coefficient is used as an indicator parameter affecting the injection accuracy.

6. The method according to claim 5, characterized in that Determining the difference in injection volume generated by the previous round of injection includes: Obtaining the injection error of each battery cell that completed the injection in the previous round; the injection error is the difference between the actual injection amount of the battery cell and the target injection amount; Eliminating abnormal points in the injection error; the abnormal points include values ​​that are not within a preset value range; The average value of the injection errors after elimination is taken as the injection amount difference.

7. The method according to any one of claims 1 to 6, characterized in that: The step of controlling the electrolyte injection into the battery cell based on the adjusted injection coefficient includes: The target injection volume is determined using the adjusted injection coefficient and the target injection volume; The injection pump is controlled to extract the target injection volume of electrolyte from the electrolyte buffer tank and inject it into the battery cell.

8. A battery liquid injection device, characterized in that: The device comprises: a parameter determination module, used to determine an index parameter affecting the injection accuracy, wherein the index parameter includes at least one of the following parameters: an electrolyte temperature correction coefficient or an injection volume difference correction coefficient, wherein the electrolyte temperature correction coefficient is determined by an electrolyte density corresponding to a currently acquired electrolyte temperature and an electrolyte density corresponding to a last acquired electrolyte temperature, and the injection volume difference correction coefficient is determined by an injection volume difference generated during the injection process and a target injection volume, wherein the injection volume difference indicates a difference between an actual injection volume of a battery cell and the target injection volume; An adjustment module, configured to adjust the injection coefficient according to the index parameter, wherein the injection coefficient is a coefficient that is positively correlated with the electrolyte density; the adjustment includes: taking the sum of the product between the electrolyte temperature correction coefficient and the injection coefficient and the injection coefficient as the adjusted injection coefficient, or taking the product between the injection volume difference correction coefficient and the injection coefficient and the difference between the injection coefficient and the injection coefficient as the adjusted injection coefficient; The injection module is used to determine a target injection volume based on the adjusted injection coefficient and the target injection amount, and inject the electrolyte of the target injection volume into the battery cell.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

11. A computer program product, comprising a computer program, characterized in that The computer program is executed by a processor to implement the method according to any one of claims 1 to 7.

Images