Method, device, equipment, battery cell filling amount determination system and medium

Abstract

The present application discloses a method, device, equipment, battery cell injection system and medium for determining the amount of liquid injected into a battery cell. The method includes: obtaining the current liquid injection amount of the target liquid injection cup in the current compensation cycle; and obtaining the current cumulative deviation value of the current compensation cycle, wherein the current cumulative deviation value of the first compensation cycle is a preset value, and the current cumulative deviation value of the non-first compensation cycle is the compensation value of the previous compensation cycle; based on the size relationship between the current liquid injection amount and the reference battery cell amount and the current cumulative deviation value, obtaining the compensation value of the target liquid injection cup in the current compensation cycle; using the compensation value of the current compensation cycle to compensate the target liquid injection amount of the target battery cell corresponding to the target liquid injection cup, obtaining the compensated target liquid injection amount, which is used to inject liquid into the target battery cell, and the target battery cell is the battery cell that needs to be injected with liquid using the target liquid injection cup in the current compensation cycle. The above scheme can improve the accuracy of liquid injection amount control.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a method, device, equipment, battery cell filling system and medium for determining the amount of liquid filled in a battery cell. Background Art

[0002] Electrolyte is an important component of battery cells. Injecting electrolyte into battery cells is a key step in the battery cell production process. The quality of injection will have an important impact on the performance and quality of the battery cells.

[0003] In the related art, a cell injection mechanism is used to inject liquid into the cell, wherein a liquid injection pump may be provided in the cell injection mechanism. During the injection process, the injection volume configured for the liquid injection pump may be adjusted, and the injection compensation value is usually determined by the injection volume of the cell injected by the liquid injection pump. When there is an abnormal fluctuation in the injection volume during the injection process, the existing injection volume control method cannot eliminate the influence of the abnormal fluctuation in the data, resulting in the inaccuracy of the obtained compensation value. Summary of the invention

[0004] The present application at least provides a method, device, equipment, battery cell filling amount determination method, device, battery cell filling system and medium, which can solve the problem of inaccurate filling amount control.

[0005] The present application provides a method for determining the liquid filling amount of a battery cell, including: obtaining a current liquid filling amount of a target liquid filling cup in a current compensation cycle; and obtaining a current cumulative deviation value of the current compensation cycle, wherein the current cumulative deviation value of the first compensation cycle is a preset value, and the current cumulative deviation value of a non-first compensation cycle is the compensation value of the previous compensation cycle; based on the size relationship between the current liquid filling amount and the reference battery cell amount and the current cumulative deviation value, obtaining the compensation value of the target liquid filling cup in the current compensation cycle; using the compensation value of the current compensation cycle to compensate the target liquid filling amount of the target battery cell corresponding to the target liquid filling cup, and obtaining the compensated target liquid filling amount for use in filling the target battery cell, wherein the target battery cell is a battery cell that needs to be filled with liquid using the target liquid filling cup in the current compensation cycle.

[0006] In the above scheme, the filling cup is compensated periodically. In the current compensation cycle, the filling situation of the current cycle and the compensation situation of the previous cycle are combined to jointly determine the compensation value of this cycle, which enriches the basis for determining the compensation value, can reduce the phenomenon of abnormal compensation caused by abnormal fluctuations in single-cycle data, and improve the accuracy of the compensation value.

[0007] In some embodiments, before obtaining the compensation value of the target filling cup in the current compensation cycle based on the size relationship between the current filling amount and the reference battery cell amount and the current cumulative deviation value, the method also includes: evaluating the filling quality of the target filling cup based on the filling amount data of the target filling cup; in response to the filling quality of the target filling cup meeting the preset quality requirements, executing the step of obtaining the compensation value of the target filling cup in the current compensation cycle based on the size relationship between the current filling amount and the reference battery cell amount and the current cumulative deviation value.

[0008] In the above scheme, the injection quality is evaluated in advance, and the compensation value is determined only when the injection quality meets the preset quality requirements, thereby avoiding invalid compensation value calculations, improving efficiency and reducing costs.

[0009] In some embodiments, the filling quantity data includes the filling quantities of multiple historical battery cells corresponding to the target filling cup; based on the filling quantity data, evaluating the filling quality of the target filling cup includes: calculating the process capability index of the target filling cup based on the filling quantities of multiple historical battery cells; the preset quality requirements include the process capability index being greater than a preset threshold.

[0010] In the above scheme, the injection process capability index is calculated using the injection reserves of multiple historical battery cells. By limiting the process capability index to be greater than a preset threshold, the compensation value is determined only when the injection quality is high, avoiding invalid compensation value calculations, improving efficiency and reducing costs.

[0011] In some embodiments, obtaining the current liquid filling amount of the target liquid filling cup in the current compensation cycle includes: obtaining the liquid filling amount data of the target liquid filling cup in the current compensation cycle; the liquid filling amount data includes the liquid filling amounts of multiple historical battery cells corresponding to the target liquid filling cup; and statistically analyzing the liquid filling amounts of multiple historical battery cells in the current compensation cycle to obtain the current liquid filling amount in the current compensation cycle.

[0012] In the above scheme, the current liquid filling amount can be obtained by statistical means, thereby reflecting the liquid filling status of the target liquid filling cup in the current compensation cycle.

[0013] In some embodiments, obtaining the target filling cup's filling quantity data in the current compensation cycle includes: collecting the filling quantities of multiple historical battery cells in the current compensation cycle as the filling quantity data of the target filling cup in the current compensation cycle, and the multiple historical battery cells in the current compensation cycle are battery cells that were filled with liquid using the target filling cup in the previous compensation cycle.

[0014] In the above scheme, the battery cell that was injected with liquid using the target injection cup in the previous cycle is used as the historical battery cell of the current cycle, and the acquisition range of the injection inventory data of the current cycle is limited to a certain range before the current cycle, so that the injection inventory data can accurately reflect the current injection situation and simplify the subsequent processing steps.

[0015] In some embodiments, based on the size relationship between the current liquid filling amount and the reference battery cell amount and the current cumulative deviation value, obtaining the compensation value of the current compensation cycle includes: in response to the size relationship indicating that the current liquid filling amount is greater than the reference battery cell amount, subtracting the preset compensation amount from the current cumulative deviation value to obtain the compensation value of the current compensation cycle; in response to the size relationship indicating that the current liquid filling amount is less than the reference battery cell amount, adding the preset compensation amount to the current cumulative deviation value to obtain the compensation value of the current compensation cycle.

[0016] In the above scheme, according to the relationship between the current liquid filling amount and the reference battery cell amount, the preset compensation amount is adjusted based on the current accumulated deviation value to achieve gradient compensation and avoid over-compensation caused by data fluctuations.

[0017] In some embodiments, using the compensation value of the current compensation cycle to compensate for the target filling amount of the target battery cell corresponding to the target filling cup includes: in response to the target battery cell satisfying the filling compensation condition, using the compensation value to compensate for the target filling amount of the target battery cell corresponding to the target filling cup; the filling compensation condition is used to characterize that the target battery cell is non-secondary filling.

[0018] In the above scheme, the battery cells for secondary refilling are excluded from the compensation range to avoid interference with the secondary refilling.

[0019] In some embodiments, the injection compensation condition includes that the target injection volume of the target battery cell is greater than a preset injection threshold; before using the compensation value of the current compensation cycle to compensate the target injection volume of the target battery cell corresponding to the target injection cup, the method also includes: obtaining the target injection volume of the target battery cell; in response to the target injection volume being greater than the preset injection threshold, determining that the target battery cell meets the injection compensation condition.

[0020] In the above scheme, whether the battery cell is in the second liquid replenishment is determined according to the target liquid injection volume, so that the battery cell in the second liquid replenishment is accurately excluded from the compensation range.

[0021] The present application provides a device for determining the liquid filling amount of a battery cell, including an acquisition module, a calculation module and a compensation module, the acquisition module being used to acquire the current liquid filling amount of a target liquid filling cup in a current compensation cycle; and, acquiring the current cumulative deviation value of the current compensation cycle, the current cumulative deviation value of the first compensation cycle being a preset value, and the current cumulative deviation value of a non-first compensation cycle being the compensation value of the previous compensation cycle; the calculation module being used to obtain the compensation value of the target liquid filling cup in the current compensation cycle based on the size relationship between the current liquid filling amount and the reference battery cell amount and the current cumulative deviation value; the compensation module being used to compensate the target liquid filling amount of the target battery cell corresponding to the target liquid filling cup using the compensation value of the current compensation cycle, and obtaining the compensated target liquid filling amount for use in filling the target battery cell, the target battery cell being the battery cell that needs to be filled with liquid using the target liquid filling cup in the current compensation cycle.

[0022] The present application provides an electronic device, including a memory and a processor, wherein program instructions are stored in the memory, and the above method is implemented when the program instructions are executed by the processor.

[0023] The present application provides a battery cell injection system, which includes a compensation device and a plurality of battery cell injection mechanisms. The compensation device is used to execute the above method to obtain a compensated target injection volume corresponding to a plurality of injection cups; the battery cell injection mechanism includes an injection pump and a plurality of injection cups corresponding to the injection pump; the injection pump is used to inject electrolyte into the corresponding injection cup according to each compensated target injection volume; and each injection cup is used to inject electrolyte into the corresponding battery cell.

[0024] In the above scheme, the compensation device is used to obtain the target injection volume for compensation in units of the refilling cup, and the battery cell injection mechanism is used to inject the battery cell according to the compensated target injection volume, thereby realizing fine control of the battery cell injection volume.

[0025] In some embodiments, the battery cell injection system also includes a logic controller; the logic controller is connected to the compensation device; the battery cell injection mechanism also includes an injection pump controller and an injection motor; the injection pump controller is connected to the compensation device; the compensation device is used to write the compensated target injection volume into the injection pump controller, and send a write completion signal to the logic controller; the logic controller is used to send a start signal to the injection pump controller in response to the write completion signal, and the injection pump controller responds to the start signal to control the injection motor to inject liquid.

[0026] In the above scheme, a logic controller is arranged to cooperate with the compensation device and the battery cell injection mechanism to trigger injection after the target injection amount after compensation is written, thereby injecting the battery cell according to the target injection amount after compensation.

[0027] In some embodiments, the battery cell filling system also includes a first weighing mechanism and a second weighing mechanism; the first weighing mechanism is used to weigh the battery cell before the current filling to obtain a first weighing result; the second weighing mechanism is used to weigh the battery cell after the current filling to obtain a second weighing result; the compensation device is also used to calculate the target filling amount corresponding to the battery cell based on the first weighing result; and, based on the second weighing result, calculate the filling amount of the battery cell after the current filling.

[0028] In the above scheme, the first weighing mechanism and the second weighing mechanism are respectively used to weigh the battery cell before and after liquid injection, so as to determine the target liquid injection amount and the liquid injection reserve, so as to determine the compensation value.

[0029] In some embodiments, the compensation device is also used to determine that the battery cell is a qualified battery cell in response to the liquid injection level of the battery cell meeting the target level requirement, and to determine that the battery cell is an unqualified battery cell in response to the liquid injection level of the battery cell not meeting the target level requirement; the battery cell liquid injection mechanism is also used to perform secondary liquid replenishment on the unqualified battery cell.

[0030] In the above scheme, the compensation device can determine whether the liquid injection is qualified, and the battery cell liquid injection mechanism is used to perform secondary liquid injection on unqualified battery cells to reduce the unqualified rate.

[0031] The present application provides a computer-readable storage medium on which program instructions are stored. When the program instructions are executed by a processor, the above method is implemented.

[0032] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings herein are incorporated into the specification and constitute a part of the specification. These drawings illustrate embodiments consistent with the present application and are used together with the specification to illustrate the technical solution of the present application.

[0034] Figure 1 is a flow chart of a method for determining a liquid injection amount for a battery cell provided in some embodiments of the present application;

[0035] Figure 2 is a schematic diagram of a framework of a device for determining a battery cell liquid injection amount provided in some embodiments of the present application;

[0036] Figure 3 is a schematic diagram of a framework of an electronic device provided in some embodiments of the present application;

[0037] Figure 4 is a schematic diagram of a battery cell injection system provided in some embodiments of the present application;

[0038] Figure 5is a flow chart of a method for determining the amount of liquid injected into a battery cell provided in some other embodiments of the present application;

[0039] Figure 6 It is a schematic diagram of the framework of the computer-readable storage medium provided in some embodiments of the present application. DETAILED DESCRIPTION

[0040] The scheme of the embodiment of the present application is described in detail below in conjunction with the drawings of the specification.

[0041] In the following description, for the purpose of explanation rather than limitation, specific details such as specific subsystem structures, interfaces, and technologies are provided to facilitate a thorough understanding of the present application.

[0042] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there may be three relationships. 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 objects associated before and after are in an "or" relationship. In addition, "many" in this article means two or more than two. In addition, the term "at least one" in this article means any combination of at least two of any one or more of a plurality of, for example, including at least one of A, B, and C, can mean including any one or more elements selected from the set consisting of A, B, and C.

[0043] Electrolyte is an important component of the battery cell, and injecting electrolyte into the battery cell is a key step in the battery cell production process. The battery cell can be injected with electrolyte using a battery cell injection mechanism. Specifically, the battery cell injection mechanism includes an injection pump. One injection pump can correspond to multiple injection cups. The injection cup is used to inject electrolyte into a single battery cell.

[0044] During injection, the injection pump injects electrolyte into the corresponding multiple injection cups respectively, and the injection cups then inject the electrolyte into the corresponding battery cells. The amount of electrolyte injected into each injection cup can be configured to control the injection amount of the battery cell. However, due to reasons such as the possibility that liquid may remain in the injection mechanism, there may be a certain difference between the amount of electrolyte configured for the injection cup and the actual amount of electrolyte retained in the battery cell. Therefore, in the related art, the compensation amount is usually calculated in units of pumps to adjust the injection amount of the injection pump. When determining the compensation amount, the injection compensation value is usually determined by the injection amount of the battery cell injected by the injection pump.

[0045] The researchers of this application found that during the injection process, the above injection amount will fluctuate. When abnormal fluctuations occur, determining the compensation value based on this will affect the accuracy of the compensation value. Therefore, the researchers of this application designed a method, device, equipment, battery cell injection system and medium for determining the injection amount of a battery cell, and performed periodic compensation on the injection cup. In the current compensation cycle, the compensation value of this cycle is determined by combining the injection situation of the current cycle and the compensation situation of the previous cycle, which enriches the basis for determining the compensation value once, can reduce the phenomenon of abnormal compensation caused by abnormal fluctuations in data in a single cycle, and improve the accuracy of the compensation value.

[0046] The method for determining the amount of liquid injected into a battery cell disclosed in the embodiment of the present application can be applied to any type of battery cell, such as a lithium battery. The overall process of battery injection can include several injection stages, and the method for determining the amount of liquid injected into a battery cell disclosed in the embodiment of the present application can be applied to any injection stage. For example, the primary or secondary injection stage of lithium battery production.

[0047] See also Figure 1 , Figure 1 It is a flow chart of a method for determining the amount of liquid injected into a battery cell provided in some embodiments of the present application. It should be noted that the method for determining the amount of liquid injected into a battery cell provided in the embodiments of the present application can be used to determine the amount of liquid injected into a battery cell by a battery cell injection mechanism. In the embodiments of the present application, the battery cell injection mechanism includes an injection pump and an injection cup, one injection pump can correspond to multiple injection cups, and each injection cup can inject liquid into one battery cell.

[0048] Specifically, the method includes:

[0049] Step S110: obtaining the current liquid content of the target liquid filling cup in the current compensation cycle.

[0050] It should be noted that each injection cup can be compensated separately, and each injection cup can be used as a target injection cup. The calculation of the injection amount compensation value can be performed periodically, and the latest determined compensation value of the current compensation cycle can be used when performing compensation.

[0051] The current liquid filling amount may be for the current compensation cycle, and may represent the liquid filling condition of the target liquid filling cup in the current compensation cycle. Determining the compensation value based on the current liquid filling amount of the current compensation cycle can make the compensation value more consistent with the liquid filling condition of the current compensation cycle.

[0052] Among them, the liquid filling capacity may refer to the actual electrolyte capacity of the battery cell after the battery cell is filled with liquid. For each battery cell, its liquid filling capacity after liquid filling can be determined. In some implementation scenarios, the liquid filling capacity of the battery cell can be determined by weighing. Furthermore, the battery cell can be weighed before and after liquid filling to determine the liquid filling capacity of the battery cell. The target liquid filling cup is used to fill the battery cell, and the current liquid filling capacity of the target liquid filling cup can characterize the capacity of the battery cell filled with liquid using the target liquid filling cup.

[0053] In some embodiments, the above compensation cycles may be divided according to certain standards, for example, according to time, or according to the number of battery cells.

[0054] In a specific application scenario, the compensation cycle may be related to the number of cells injected into the target injection cup, and illustratively, every 20 cells constitute a compensation cycle. The number of cells corresponding to one compensation cycle may be adjusted.

[0055] Step S120: obtaining the current accumulated deviation value of the current compensation cycle.

[0056] It should be noted that the execution order of step S110 and step S120 is not limited by the order of the numbers.

[0057] The compensation value of the previous compensation cycle can be used as a reference for the current compensation cycle to obtain the compensation value of the current compensation cycle.

[0058] In a specific application scenario, the current cumulative deviation value of the first compensation cycle can be a preset value, which can be set to 0, or adjusted according to the actual situation of the target injection cup. The current cumulative deviation value of a non-first compensation cycle can be the compensation value of the previous compensation cycle.

[0059] Step S130: based on the magnitude relationship between the current liquid filling quantity and the reference battery cell quantity and the current accumulated deviation value, the compensation value of the target liquid filling cup in the current compensation cycle is obtained.

[0060] The reference cell reserve may be an expected cell electrolyte reserve, which may be determined based on the cell specifications. Exemplarily, the reference cell reserve is 100 g.

[0061] It can be understood that the current liquid filling amount can represent the liquid filling condition of the target liquid filling cup in the current compensation cycle, while the reference battery cell holding amount can represent the expected value of liquid filling. By comparing the two, the difference between the actual liquid filling condition and the expected liquid filling condition can be determined, which can guide the determination of the compensation value.

[0062] It can be understood that if the current injection amount is greater than the reference battery cell amount, it means that the compensation direction may be decreasing. If the current injection amount is less than the reference battery cell amount, it means that the compensation direction may be increasing.

[0063] Step S140: using the compensation value of the current compensation cycle to compensate for the target liquid filling volume of the target liquid filling cup corresponding to the target battery cell, to obtain the compensated target liquid filling volume.

[0064] The target battery cell is a battery cell that needs to be injected with liquid using the target injection cup, and the target battery cell that is compensated using the current cycle compensation value may be a battery cell that needs to be injected with liquid using the target injection cup within the current compensation cycle.

[0065] When the target liquid injection cup injects liquid into the battery cell, the target liquid injection cup may inject liquid into the battery cell according to the target liquid injection amount corresponding to the battery cell. The compensation value may be used to compensate for the target liquid injection amount.

[0066] It should be noted that the target injection volume of different battery cells, that is, the amount of liquid that needs to be controlled by the target injection cup to be injected into the battery cell can be different or the same. In a specific application scenario, the target injection cup can be used to inject liquid into multiple battery cells of the same specification in sequence. Since the specifications of the battery cells to be injected are the same, the target injection volumes of different battery cells can be the same; of course, although the battery cell specifications are the same, there may be certain differences between different battery cells, and the target injection volumes of different battery cells may also be different.

[0067] In some implementation scenarios, a corresponding compensation value may be determined for the target liquid filling cup, and the compensation value corresponding to the target liquid filling cup may be applicable to each battery cell that is filled with liquid using the target liquid filling cup.

[0068] One injection pump corresponds to multiple injection cups. The injection errors of the same injection cup are usually similar, but the injection errors of different injection cups may differ to a certain extent. The statistical results of the injection data of all battery cells under one pump cannot accurately represent the injection error of each injection cup under the pump. Specifically, if the same specification of battery cells are injected, the holding quantity of multiple injection cups under the same injection pump is counted separately, and the statistical values ​​of different injection cups may be different, that is, data stratification occurs. Adjustments are made based on the injection cup as a unit to improve the refinement of the injection volume adjustment. Targeted compensation is performed based on the injection error of each injection cup, rather than performing the same compensation on all injection cups under the same pump, thereby eliminating data stratification and improving the accuracy of injection.

[0069] In some embodiments, before determining the compensation value, the filling quality of the target filling cup can be evaluated based on the filling quantity data of the target filling cup; in response to the filling quality of the target filling cup meeting the preset quality requirements, the step of determining the compensation value based on the filling quantity data is executed.

[0070] The data on the liquid filling quantity of the target liquid filling cup may include the liquid filling quantity of a number of battery cells that are filled with liquid using the target liquid filling cup, and may also reflect the liquid filling status of the target liquid filling cup.

[0071] In some implementation scenarios, the target liquid filling cup may fill multiple battery cells in sequence. The liquid filling quantity data of the target liquid filling cup may include the liquid filling quantities of multiple historical battery cells corresponding to the target liquid filling cup.

[0072] It should be noted that the target filling cup's historical filling quantity data can indicate whether the target filling cup can accurately fill the liquid and can be used to evaluate the filling quality. If the filling quality is too low, compensation will not improve the accuracy of the battery cell filling. By pre-setting the preset quality requirements for filtering, if the quality is too low, no compensation will be performed, which can reduce invalid compensation steps and reduce costs.

[0073] In some embodiments, the historical battery cells corresponding to the liquid filling reserve data can be configured. Exemplarily, the liquid filling reserve data can include the liquid filling reserve of all historical battery cells corresponding to the target liquid filling cup, and can also include the liquid filling reserve of some battery cells among all historical battery cells.

[0074] It should be noted that the above injection quality assessment step can be performed once or once in each compensation cycle. Further, if an assessment is performed once in each compensation cycle, the injection quantity data used in each assessment is different.

[0075] In some embodiments, the liquid filling quantity data may also be associated with the compensation cycle. The liquid filling quantity data of a compensation cycle may include the liquid filling quantity of multiple historical battery cells of the compensation cycle, and the historical battery cells corresponding to different compensation cycles may be different, and thus each compensation cycle may be quality evaluated based on the liquid filling quantity data of the corresponding cycle.

[0076] In some implementation scenarios, the multiple historical battery cells of the current compensation cycle may be battery cells that were injected with the target injection cup in the previous compensation cycle.

[0077] In some embodiments, the liquid injection reserve data includes the liquid injection reserve of multiple historical battery cells corresponding to the target liquid injection cup. The process capability index corresponding to the liquid injection reserve of multiple historical battery cells can be used as an evaluation indicator of the liquid injection quality. The preset quality requirement can include that the process capability index is greater than a preset threshold.

[0078] In some implementation scenarios, the upper and lower specification limits are specified for the injection volume. The process capability index CPK can be calculated using the following formula:

[0079]

[0080] Where X represents the injection volume, σ represents the standard deviation of the injection volume, USL is the upper specification limit, and LSL is the lower specification limit.

[0081] The current liquid filling quantity of the current compensation cycle can be obtained based on the liquid filling quantity data of the current compensation cycle. In some embodiments, obtaining the current liquid filling quantity of the target liquid filling cup in the current compensation cycle may include: obtaining the liquid filling quantity data of the target liquid filling cup in the current compensation cycle, wherein the liquid filling quantity data of the current compensation cycle includes the liquid filling quantities of multiple historical battery cells corresponding to the current compensation cycle, and the current liquid filling quantity of the current compensation cycle is obtained by statistically analyzing the data.

[0082] In some embodiments, the multiple historical battery cells of the current compensation cycle may be battery cells that were injected with liquid using the target injection cup in the previous compensation cycle. Each compensation cycle determines the current injection reserve based on the injection reserve of the previous cycle to obtain the compensation value. This allows the compensation value to be closer to the current injection situation of the injection cup. Specifically, obtaining the injection reserve data of the target injection cup in the current compensation cycle may include collecting the injection reserve of multiple historical battery cells in the current compensation cycle as the injection reserve data for the current compensation cycle.

[0083] In a specific application scenario, the filling quantity data of the current compensation cycle includes the filling quantity of 20 battery cells that were filled with liquid using the target filling cup in the previous compensation cycle. The current filling quantity of the current compensation cycle is calculated based on this, and then the compensation value of the current compensation cycle is obtained, which is used to compensate the 20 battery cells that need to be filled with liquid using the target filling cup in the current compensation cycle.

[0084] In some embodiments, statistics of multiple historical battery cells in the current compensation cycle may be collected for different aspects. For example, at least one of the maximum value, the minimum value, the central tendency statistical value, etc. may be collected.

[0085] In some implementation scenarios, the central tendency statistical value of multiple historical battery cell liquid filling reserves in the current compensation cycle is calculated as the current liquid filling reserve. In some implementation scenarios, the central tendency statistical value may be the average of the multiple historical battery cell liquid filling reserves.

[0086] In some embodiments, the compensation value of each compensation cycle can be obtained by adjusting the preset compensation amount based on the compensation value of the previous compensation cycle. The relationship between the current injection amount and the reference battery cell amount can be used to guide how to adjust the compensation value.

[0087] In some embodiments, determining the compensation value of the current compensation cycle may include: in response to the current liquid injection reserve being greater than the reference battery cell reserve, subtracting a preset compensation amount from the current cumulative deviation value to obtain the compensation value of the current compensation cycle. In response to the current liquid injection reserve being less than the reference battery cell reserve, adding the preset compensation amount to the current cumulative deviation value to obtain the compensation value of the current compensation cycle. The preset compensation amount may be adjusted.

[0088] In the above scheme, the gradient compensation method is used to avoid the problem of over-compensation caused by data fluctuations. Specifically, if there is a certain abnormal fluctuation in the current injection volume when the compensation value is determined at a certain time, causing the compensation value determined this time to follow this fluctuation, it may cause over-compensation. By using the gradient compensation method, the preset compensation amount is adjusted each time to avoid over-compensation.

[0089] In a specific application scenario, a compensation value is calculated for the current compensation cycle. There may be multiple target cells in the current compensation cycle, and each target cell may use the compensation value of the current compensation cycle.

[0090] In a specific application scenario, the liquid filling amount of the battery cell that was filled with liquid using the target filling cup in the previous compensation cycle is obtained as the liquid filling amount data for the current compensation cycle, and the current liquid filling amount of the current compensation cycle is determined based on this, and then the compensation value of the current compensation cycle is determined, which is used to compensate for the target liquid filling amount of the target battery cell in the current compensation cycle.

[0091] In some embodiments, the target liquid injection amount of the target battery cell is obtained before compensation. The step of performing compensation may include: in response to the target battery cell satisfying the liquid injection compensation condition, compensating the target liquid injection amount of the target battery cell using the compensation value. Specifically, a judgment is made on whether each target battery cell satisfies the liquid injection compensation condition, and compensation is performed if the condition is satisfied.

[0092] Among them, the injection compensation condition can be used to characterize that the target battery cell is not a secondary refill. It is understandable that after a battery cell is injected, if the retention requirement of this injection cannot be met, the battery cell can be refilled a second time. Exemplarily, battery cell A is injected, and the reference battery cell retention for this injection is 100g±2g. If after injection, the actual injection retention of battery cell A is 95g, it does not reach the injection retention range, and the battery cell can be injected a second time in order to inject the battery cell to the reference battery cell retention.

[0093] Referring to the above example, if the target cell is a secondary refill, the target refill volume of the target cell is usually small, and no compensation is required. If the target cell is not a secondary refill, the target refill volume is usually large, and compensation is required.

[0094] In some embodiments, the liquid injection compensation condition may include that the target liquid injection amount of the target battery cell is greater than a preset liquid injection amount threshold. Whether it is a secondary liquid injection can be distinguished by the size of the target liquid injection amount. The method may include: obtaining the target liquid injection amount of the target battery cell, and in response to the target liquid injection amount being greater than the preset liquid injection threshold, determining that the target battery cell meets the liquid injection compensation condition.

[0095] In some embodiments, the complete process of injecting liquid into the battery cell can be divided into several injections. For example, the complete process of injecting liquid into the battery cell can include a primary injection and a secondary injection. The primary injection is used to inject a portion of electrolyte into the battery cell, and the secondary injection is used to inject another portion of electrolyte into the battery cell. Any of the above injections can be used separately as the injection performed using the injection cup in the aforementioned embodiments. It should be noted that any injection can include a secondary refill. For example, during the secondary injection, after the injection using the injection cup, if the amount of liquid in the battery cell does not meet the amount required for the secondary injection, the battery cell can be refilled for the second time.

[0096] In some implementation scenarios, during a liquid filling stage, the battery cells have not yet been filled with liquid, and the current liquid filling amount of each battery cell is 0. The same target liquid filling amount can be set for different battery cells.

[0097] In some implementation scenarios, during the secondary injection stage, it is expected that all cells have the same amount of liquid after the secondary injection is completed. The cells have already been injected once, but the current injection amount of different cells may be different. Therefore, the target injection amount can be determined based on the injection amount currently injected into the cells, in order to achieve the expected injection amount after the secondary injection is completed.

[0098] In a specific application scenario, the amount of liquid currently injected into the battery cell can be obtained by weighing the battery cell. For example, the battery cell is weighed before liquid injection, and the battery cell is weighed after each liquid injection. The current amount of liquid injection can be obtained by subtracting the weighing result before liquid injection from the weighing result after the last liquid injection.

[0099] In some implementation scenarios, each time the liquid is injected, it can be determined whether the battery cell meets the retention requirement. After the retention requirement is met, the next injection stage is entered. Exemplarily, the retention requirement can be used to specify the upper and lower limits of the battery cell retention. Due to the setting of the retention requirement, in the second injection and subsequent stages, for convenience, the same target injection amount can also be set for different battery cells.

[0100] In some implementation scenarios, the compensation value is determined based on the current injection amount and the reference cell amount. The reference cell amount can be the expected reference cell amount after the injection phase ends. For example, the reference cell amount in the first injection phase is 100g, and the reference cell amount in the second injection phase is 200g, indicating that the expected cell has 200g of electrolyte after the second injection phase.

[0101] In a specific application scenario, the complete process of cell filling is divided into primary filling and secondary filling. In the primary filling stage, the reference cell quantity can be associated with the target filling quantity of the stage, and illustratively, is consistent with the target filling quantity of the stage. In the secondary filling stage, the reference cell quantity can be determined based on the cell specifications.

[0102] In a specific application scenario, the complete process of battery cell filling is divided into primary filling and secondary filling. In the secondary filling stage, the filling cup is used to fill the battery cell with liquid for the second time. Before the secondary filling, the battery cell is weighed first, and the target filling amount of each battery cell is determined based on the current filling amount of the battery cell and the reference battery cell. The central trend statistical value of the filling amount of multiple historical battery cells in the filling cup is calculated, and the compensation value is determined according to the relationship between the central trend statistical value and the reference battery cell. The target filling amount of each battery cell is compensated by the compensation value to obtain the compensated target filling amount.

[0103] In some embodiments, after determining the compensation value of the current compensation cycle, the compensation value of the current compensation cycle may be compared with the cumulative compensation threshold. If the compensation value of the current compensation cycle is less than or equal to the cumulative compensation threshold, the compensation of the current compensation cycle may be started. If the compensation value of the current compensation cycle is greater than the cumulative compensation threshold, an early warning may be issued to prompt the user to handle the problem. If it is confirmed that compensation is required, the compensation value of the previous cycle or the cumulative compensation threshold may be used as the compensation value of the current compensation cycle.

[0104] In some embodiments, at least one of a threshold corresponding to a process capability index, a number of cells corresponding to a single compensation cycle, a preset compensation amount, and a cumulative compensation threshold may be used as a configurable parameter.

[0105] See also Figure 2 , Figure 2 It is a schematic diagram of the framework of a device for determining the amount of liquid injected into a battery cell provided in some embodiments of the present application.

[0106] The battery cell injection amount determination device 20 may include an acquisition module 21, a calculation module 22 and a compensation module 23. The acquisition module 21 is used to acquire the current injection amount of the target injection cup in the current compensation cycle; and, to acquire the current cumulative deviation value of the current compensation cycle. The current cumulative deviation value of the first compensation cycle is a preset value, and the current cumulative deviation value of the non-first compensation cycle is the compensation value of the previous compensation cycle. The calculation module 22 is used to obtain the compensation value of the target injection cup in the current compensation cycle based on the size relationship between the current injection amount and the reference battery cell amount and the current cumulative deviation value; the compensation module 23 is used to compensate the target injection amount of the target battery cell corresponding to the target injection cup using the compensation value of the current compensation cycle, and obtain the compensated target injection amount for injecting the target battery cell. The target battery cell is the battery cell that needs to be injected with the target injection cup in the current compensation cycle.

[0107] The liquid filling cup is periodically compensated. In the current compensation cycle, the compensation value of the current cycle is determined by combining the liquid filling situation of the current cycle and the compensation situation of the previous cycle, which enriches the basis for determining the compensation value, can reduce the phenomenon of abnormal compensation caused by abnormal fluctuations in single-cycle data, and improve the accuracy of the compensation value. In some embodiments, the battery cell liquid filling amount determination device 20 may also include an evaluation module for evaluating the liquid filling quality of the target liquid filling cup based on the liquid filling amount data of the target liquid filling cup before obtaining the compensation value of the target liquid filling cup in the current compensation cycle based on the size relationship between the current liquid filling amount and the reference battery cell amount and the current cumulative deviation value; in response to the liquid filling quality of the target liquid filling cup meeting the preset quality requirements, the calculation module 22 is used to execute the step of obtaining the compensation value of the target liquid filling cup in the current compensation cycle based on the size relationship between the current liquid filling amount and the reference battery cell amount and the current cumulative deviation value.

[0108] In the above scheme, the injection quality is evaluated in advance, and the compensation value is determined only when the injection quality meets the preset quality requirements, thereby avoiding invalid compensation value calculations, improving efficiency and reducing costs.

[0109] In some embodiments, the filling quantity data includes the filling quantities of multiple historical battery cells corresponding to the target filling cup; the evaluation module is used to evaluate the filling quality of the target filling cup based on the filling quantity data, specifically including: calculating the process capability index of the target filling cup based on the filling quantities of multiple historical battery cells; the preset quality requirements include the process capability index being greater than a preset threshold.

[0110] In the above scheme, the injection process capability index is calculated using the injection reserves of multiple historical battery cells. By limiting the process capability index to be greater than a preset threshold, the compensation value is determined only when the injection quality is high, avoiding invalid compensation value calculations, improving efficiency and reducing costs.

[0111] In some embodiments, the acquisition module 21 is used to obtain the current liquid filling capacity of the target filling cup in the current compensation cycle, specifically including: obtaining the liquid filling capacity data of the target filling cup in the current compensation cycle; the liquid filling capacity data includes the liquid filling capacity of multiple historical battery cells corresponding to the target filling cup; and counting the liquid filling capacity of multiple historical battery cells in the current compensation cycle to obtain the current liquid filling capacity in the current compensation cycle.

[0112] In the above scheme, the current liquid filling amount can be obtained by statistical means, thereby reflecting the liquid filling status of the target liquid filling cup in the current compensation cycle.

[0113] In some embodiments, the acquisition module 21 is used to obtain the liquid filling capacity data of the target filling cup in the current compensation cycle, including: collecting the liquid filling capacity of multiple historical battery cells in the current compensation cycle as the liquid filling capacity data of the target filling cup in the current compensation cycle, and the multiple historical battery cells in the current compensation cycle are the battery cells that were filled with liquid using the target filling cup in the previous compensation cycle.

[0114] In the above scheme, the battery cell that was injected with liquid using the target injection cup in the previous cycle is used as the historical battery cell of the current cycle, and the acquisition range of the injection inventory data of the current cycle is limited to a certain range before the current cycle, so that the injection inventory data can accurately reflect the current injection situation and simplify the subsequent processing steps.

[0115] In some embodiments, the calculation module 22 is used to obtain the compensation value of the current compensation cycle based on the size relationship between the current liquid filling amount and the reference battery cell amount and the current cumulative deviation value, specifically including: in response to the size relationship indicating that the current liquid filling amount is greater than the reference battery cell amount, the current cumulative deviation value is subtracted from the preset compensation amount to obtain the compensation value of the current compensation cycle; in response to the size relationship indicating that the current liquid filling amount is less than the reference battery cell amount, the current cumulative deviation value is added to the preset compensation amount to obtain the compensation value of the current compensation cycle.

[0116] In the above scheme, according to the relationship between the current liquid filling amount and the reference battery cell amount, the preset compensation amount is adjusted based on the current accumulated deviation value to achieve gradient compensation and avoid over-compensation caused by data fluctuations.

[0117] In some embodiments, the compensation module 23 is used to compensate the target liquid filling volume of the target battery cell corresponding to the target liquid filling cup using the compensation value of the current compensation cycle, specifically including: in response to the target battery cell satisfying the liquid filling compensation condition, compensating the target liquid filling volume of the target battery cell corresponding to the target liquid filling cup using the compensation value; the liquid filling compensation condition is used to characterize that the target battery cell is non-secondary liquid filling.

[0118] In the above scheme, the battery cells for secondary refilling are excluded from the compensation range to avoid interference with the secondary refilling.

[0119] In some embodiments, the injection compensation condition includes that the target injection volume of the target battery cell is greater than a preset injection threshold; the compensation module 23 is also used to obtain the target injection volume of the target battery cell before using the compensation value of the current compensation cycle to compensate the target injection volume of the target battery cell corresponding to the target injection cup; in response to the target injection volume being greater than the preset injection threshold, it is determined that the target battery cell meets the injection compensation condition.

[0120] In the above scheme, whether the battery cell is in the second liquid replenishment is determined according to the target liquid injection volume, so that the battery cell in the second liquid replenishment is accurately excluded from the compensation range.

[0121] See also Figure 3 , Figure 3 It is a schematic diagram of the framework of an electronic device provided in some embodiments of the present application.

[0122] The electronic device 30 includes a memory 31 and a processor 32, and the processor 32 is used to execute the program instructions stored in the memory 31 to implement any of the above-mentioned methods for determining the amount of liquid injection of the battery cell. In a specific implementation scenario, the electronic device 30 may include, but is not limited to: computer equipment, electrical equipment, microcomputers, desktop computers, servers, and in addition, the electronic device 30 may also include mobile devices such as laptops and tablet computers, which are not limited here.

[0123] Specifically, the processor 32 is used to control itself and the memory 31 to implement any of the above-mentioned methods for determining the amount of liquid injected into the battery cell. The processor 32 may also be referred to as a CPU (Central Processing Unit). The processor 32 may be an integrated circuit chip having the ability to process signals. The processor 32 may also be a general-purpose processor, 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 general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. In addition, the processor 32 may be implemented by an integrated circuit chip.

[0124] In some embodiments, the electronic device 30 may run compensation software, and the compensation software is used to implement the above-mentioned method for determining the battery cell filling amount.

[0125] See also Figure 4 , Figure 4 It is a schematic diagram of the framework of the battery cell injection system provided in some embodiments of the present application.

[0126] The battery cell injection system 40 includes a compensation device 41 and a plurality of battery cell injection mechanisms 42. The battery cell injection mechanisms 42 include an injection pump 421 and a plurality of injection cups 422 corresponding to the injection pump 421.

[0127] The compensation device 41 may be the electronic device in the aforementioned embodiment, which is used to execute the method for determining the amount of liquid injection in a battery cell, and can obtain the compensated target liquid injection amount corresponding to each liquid injection cup 422. The liquid injection pump 421 is used to inject electrolyte into the corresponding liquid injection cup 422 according to each compensated target liquid injection amount, and each liquid injection cup 422 is used to inject electrolyte into the corresponding battery cell.

[0128] In some embodiments, the battery cell injection mechanism 42 further includes an injection pump controller and an injection motor (not shown in the figure). The injection pump controller can be used to control the injection amount, and the injection motor can be used to perform the injection operation.

[0129] In some implementation scenarios, a target injection amount is written in the injection pump controller for controlling the injection amount. The injection pump controller can be used to receive a start signal and, in response to the start signal, control the injection motor to perform injection.

[0130] In some implementation scenarios, the injection pump controller is connected to the compensation device 41. The compensation device 41 can be used to write the compensated target injection volume into the injection pump controller and send a start signal to the injection pump controller. The injection pump controller can be used to control the injection motor to inject liquid in response to the start signal.

[0131] In some embodiments, the battery cell injection system 40 may further include a logic controller 43, such as a programmable logic controller (PLC). The logic controller 43 may be used to obtain relevant information of the battery cell injection mechanism 42, such as the target injection volume of the battery cell corresponding to the injection cup 422. The logic controller 43 may also be used to trigger the start of injection.

[0132] In some implementation scenarios, the logic controller 43 is connected to the compensation device 41, and the two can communicate. The logic controller 43 can be used to provide the relevant information of the battery cell injection mechanism 42 to the compensation device 41 to obtain the compensation value. The compensation device 41 can be used to write the compensated target injection volume to the injection pump controller, and send a write completion signal to the logic controller 43. The logic controller 43 can be used to send a start signal to the injection pump controller in response to the write completion signal. The injection pump controller can be used to control the injection motor to inject liquid in response to the start signal.

[0133] In some embodiments, the battery cell injection system 40 may further include a first weighing mechanism and a second weighing mechanism (not shown in the figure). The first weighing mechanism is used to weigh the battery cell before the injection to obtain a first weighing result. The second weighing mechanism is used to weigh the battery cell after the injection to obtain a second weighing result.

[0134] In some implementation scenarios, the compensation device 41 can run software to record local production data, which can include the aforementioned weighing results. Further, the compensation device 41 can also process the local production data, and can calculate the target injection volume (uncompensated) corresponding to the battery cell based on the first weighing result, and calculate the injection volume after this injection based on the second weighing result.

[0135] In a specific application scenario, the uncompensated target injection volume may also be first written into the injection pump controller. The above writing operation may be performed by the compensation device 41 .

[0136] In a specific application scenario, the compensation device 41 can be used to calculate the target injection volume of the battery cell based on the first weighing result and the reference battery cell holding volume for this injection.

[0137] In a specific application scenario, the compensation device 41 can be used to calculate the liquid filling amount of the battery cell after the current liquid filling based on the second weighing result and the weighing result of the battery cell without liquid filling.

[0138] In some embodiments, the compensation device 41 can also be used to determine whether the injection is qualified. Specifically, it can be used to determine that the battery cell is a qualified battery cell in response to the injection amount of the battery cell meeting the target amount requirement, and determine that the battery cell is an unqualified battery cell in response to the injection amount of the battery cell not meeting the target amount requirement.

[0139] Among them, different subsequent processes can be adopted for qualified battery cells and unqualified battery cells.

[0140] In a specific application scenario, the battery cells are pre-weighed after being fed, then transferred to the liquid injection station for liquid injection, and then post-weighed. Among them, qualified battery cells can be discharged directly, and unqualified battery cells can enter the defective (NG) slot, and secondary liquid replenishment can be performed later.

[0141] In some embodiments, the battery cell injection mechanism 42 can be used to perform secondary fluid replenishment on unqualified battery cells.

[0142] See also Figure 5 , Figure 5 It is a flow chart of a method for determining the amount of liquid to be injected into a battery cell provided in some other embodiments of the present application.

[0143] The electronic device starts the compensation software to obtain the liquid filling quantity data of the target liquid filling cup in the current compensation cycle, including the liquid filling quantity of the corresponding multiple historical battery cells. The liquid filling quantity of the historical battery cells can be stored locally in the electronic device.

[0144] The compensation software is used to calculate the process capability index corresponding to the injection quantity of multiple historical battery cells. If the process capability index is greater than the preset threshold, it is determined whether the average of the injection quantity of the historical battery cells is greater than the reference battery cell quantity. If it is greater, the preset compensation amount is subtracted from the current cumulative deviation value to obtain the compensation value of the current compensation cycle. If it is less than, the preset compensation amount is added to the current cumulative deviation value to obtain the compensation value of the current compensation cycle.

[0145] The target injection volume fed back by the logic controller is obtained, and the compensation value and the target injection volume are added together using the compensation software to generate the compensated target injection volume, and the compensated target injection volume is written into the injection pump controller.

[0146] The compensation software is used to feed back a write completion signal to the logic controller, and the logic controller sends a start signal to the injection pump controller. The injection pump controller controls the injection motor to perform the injection operation in response to the start signal.

[0147] The battery cell after liquid injection is weighed by a weighing mechanism, and the weighing result can be stored locally in the electronic device to be used as the liquid injection quantity of the historical battery cell in the future. The above steps can be performed again in the next compensation cycle.

[0148] See also Figure 6 , Figure 6 It is a schematic diagram of the framework of the computer-readable storage medium provided in some embodiments of the present application.

[0149] The computer-readable storage medium 60 stores program instructions 61 that can be executed by a processor. When the program instructions 61 are executed by the processor, they are used to implement any of the above-mentioned methods for determining the liquid filling amount of a battery cell.

[0150] 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.

[0151] In the several embodiments provided in the present application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device implementation described above is only schematic. For example, the division of modules or units is only a logical function division. There may be other division methods in actual implementation, such as units or components can be combined or integrated into another subsystem, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0152] In addition, each functional unit in each embodiment of the present application can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit. If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or part of the contribution to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor (processor) to perform all or part of the steps of each implementation method of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program code.

Claims

1. A method for determining the amount of liquid injected into a battery cell, characterized in that: The method comprises: Obtain the current liquid filling amount of the target liquid filling cup in the current compensation cycle; and obtain the current cumulative deviation value of the current compensation cycle, wherein the target liquid filling cup is used to fill a single battery cell, the current cumulative deviation value of the first compensation cycle is a preset value, and the current cumulative deviation value of a non-first compensation cycle is the compensation value of the previous compensation cycle; Based on the magnitude relationship between the current liquid filling amount and the reference battery cell amount and the current accumulated deviation value, obtaining the compensation value of the target liquid filling cup in the current compensation cycle; The target injection volume of the target battery cell corresponding to the target injection cup is compensated using the compensation value of the current compensation cycle to obtain the compensated target injection volume for injecting the target battery cell. The target battery cell is the battery cell that needs to be injected using the target injection cup in the current compensation cycle.

2. The method according to claim 1, characterized in that The method further comprises: obtaining the compensation value of the target liquid filling cup in the current compensation cycle based on the size relationship between the current liquid filling reserve and the reference battery cell reserve and the current accumulated deviation value; Based on the liquid holding amount data of the target liquid filling cup, evaluating the liquid filling quality of the target liquid filling cup; In response to the injection quality of the target injection cup meeting the preset quality requirements, the step of obtaining the compensation value of the target injection cup in the current compensation cycle based on the size relationship between the current injection quantity and the reference battery cell quantity and the current accumulated deviation value is executed.

3. The method according to claim 2, characterized in that The liquid filling quantity data includes the liquid filling quantity of multiple historical battery cells corresponding to the target liquid filling cup; the liquid filling quality of the target liquid filling cup is evaluated based on the liquid filling quantity data of the target liquid filling cup, including: The process capability index of the target filling cup is calculated based on the filling reserves of the multiple historical battery cells; the preset quality requirement includes that the process capability index is greater than a preset threshold.

4. The method according to claim 1, characterized in that: The step of obtaining the current liquid filling quantity of the target liquid filling cup in the current compensation cycle includes: Acquire the liquid filling quantity data of the target liquid filling cup in the current compensation cycle; the liquid filling quantity data includes the liquid filling quantity of multiple historical battery cells corresponding to the target liquid filling cup; The liquid injection reserves of the plurality of historical battery cells in the current compensation cycle are counted to obtain the current liquid injection reserve in the current compensation cycle.

5. The method according to claim 4, characterized in that The step of obtaining the liquid holding amount data of the target liquid filling cup in the current compensation cycle includes: Collecting the liquid injection reserves of multiple historical battery cells in the current compensation cycle as the liquid injection reserve data of the target liquid injection cup in the current compensation cycle, wherein the multiple historical battery cells in the current compensation cycle are battery cells injected with liquid using the target liquid injection cup in the previous compensation cycle; and / or, The step of collecting statistics on the liquid injection reserves of the plurality of historical battery cells in the current compensation cycle to obtain the current liquid injection reserve in the current compensation cycle includes: The central tendency statistical value of the liquid injection reserves of the plurality of historical battery cells is calculated as the current liquid injection reserve.

6. The method according to claim 1, characterized in that The obtaining of the compensation value of the target liquid filling cup in the current compensation cycle based on the magnitude relationship between the current liquid filling amount and the reference battery cell amount and the current accumulated deviation value includes: In response to the magnitude relationship indicating that the current liquid injection reserve is greater than the reference battery cell reserve, subtracting a preset compensation amount from the current accumulated deviation value to obtain a compensation value for the current compensation cycle; In response to the magnitude relationship indicating that the current liquid injection reserve is less than the reference battery cell reserve, the current accumulated deviation value is added with a preset compensation amount to obtain a compensation value for the current compensation cycle.

7. The method according to claim 1, characterized in that The method of compensating the target liquid filling amount of the target battery cell corresponding to the target liquid filling cup by using the compensation value of the current compensation cycle includes: In response to the target battery cell satisfying the injection compensation condition, the target injection amount of the target battery cell corresponding to the target injection cup is compensated using the compensation value; the injection compensation condition is used to characterize that the target battery cell is non-secondary injection.

8. The method according to claim 7, characterized in that The injection compensation condition includes that the target injection amount of the target battery cell is greater than a preset injection threshold; before using the compensation value of the current compensation cycle to compensate the target injection amount of the target battery cell corresponding to the target injection cup, the method further includes: Obtaining a target liquid injection volume of the target battery cell; In response to the target liquid injection amount being greater than the preset liquid injection threshold, it is determined that the target battery cell satisfies the liquid injection compensation condition.

9. A device for determining the amount of liquid injected into a battery cell, characterized in that: include: An acquisition module is used to acquire the current liquid filling amount of the target liquid filling cup in the current compensation cycle; and to acquire the current cumulative deviation value of the current compensation cycle, wherein the target liquid filling cup is used to fill a single battery cell, the current cumulative deviation value of the first compensation cycle is a preset value, and the current cumulative deviation value of a non-first compensation cycle is the compensation value of the previous compensation cycle; A calculation module, configured to obtain a compensation value of the target liquid filling cup in the current compensation cycle based on a size relationship between the current liquid filling amount and the reference battery cell amount and the current accumulated deviation value; A compensation module is used to compensate the target injection volume of the target battery cell corresponding to the target injection cup using the compensation value of the current compensation cycle, and obtain the compensated target injection volume for injecting the target battery cell. The target battery cell is the battery cell that needs to be injected using the target injection cup in the current compensation cycle.

10. An electronic device, characterized in that: The method comprises a memory and a processor, wherein the memory stores program instructions, and the program instructions are used to execute the method according to any one of claims 1 to 8 when executed by the processor.

11. A battery cell injection system, characterized in that: The battery cell injection system comprises: A compensation device, used to perform the method according to any one of claims 1 to 8, and obtain compensated target injection volumes corresponding to a plurality of injection cups; A plurality of battery cell injection mechanisms, wherein the battery cell injection mechanisms include an injection pump and a plurality of injection cups corresponding to the injection pump; the injection pump is used to inject electrolyte into the corresponding injection cup according to each compensated target injection volume; each injection cup is used to inject electrolyte into a corresponding battery cell.

12. The system according to claim 11, characterized in that The battery cell injection system further comprises a logic controller; the logic controller is connected to the compensation device; The battery cell injection mechanism also includes an injection pump controller and an injection motor; the injection pump controller is connected to the compensation device; the compensation device is used to write the compensated target injection volume into the injection pump controller, and send a write completion signal to the logic controller; the logic controller is used to send a start signal to the injection pump controller in response to the write completion signal, and the injection pump controller responds to the start signal to control the injection motor to inject liquid.

13. The system according to claim 11, characterized in that The battery cell injection system further includes a first weighing mechanism and a second weighing mechanism; the first weighing mechanism is used to weigh the battery cell before the injection to obtain a first weighing result; the second weighing mechanism is used to weigh the battery cell after the injection to obtain a second weighing result; The compensation device is further used to calculate the target liquid injection volume corresponding to the battery cell based on the first weighing result; And, based on the second weighing result, the liquid injection amount of the battery cell after this liquid injection is calculated.

14. The system according to claim 13, characterized in that The compensation device is further used to determine that the battery cell is a qualified battery cell in response to the liquid injection retention amount of the battery cell meeting the target retention amount requirement, and to determine that the battery cell is an unqualified battery cell in response to the liquid injection retention amount of the battery cell not meeting the target retention amount requirement; The battery cell liquid injection mechanism is also used for performing secondary liquid replenishment on the unqualified battery cells.

15. A computer-readable storage medium having program instructions stored thereon, characterized in that: When the program instructions are executed by a processor, the method according to any one of claims 1 to 8 is implemented.

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