Balancing control method, device, equipment and system

Abstract

The invention provides an equalization control method, device, equipment and system, and relates to the field of battery equalization. The method comprises the following steps: determining an equilibrium ampere-hour Ah value of each battery in a plurality of batteries according to voltage values, current values, temperatures and capacities of the plurality of batteries; grouping the plurality of batteries into at least one battery pack, and determining the equalization priority of a channel where each battery in the first battery pack is located according to the equalization Ah value of each battery in the first battery pack; and obtaining the temperature of the first battery pack, and determining a first channel where the first battery which is started to be equalized in the first battery pack is located according to the temperature of the first battery pack, the equalization priority, the temperature threshold and the equalization channel threshold. Through the method, the equalization channel is determined according to the equalization priority of each battery monomer and the performance of the equalization device, the equalization efficiency is improved, and the technical problem that the working performance of the system is influenced by temperature rise caused by heat generated during equalization of the equalization resistor is solved.

Description

Technical Field

[0001] The present disclosure relates to the field of battery balancing, and in particular to a balancing control method, apparatus, device, and system. Background Art

[0002] The battery pack is a crucial component of electric vehicles. Because it consists of multiple cells connected in series, variations between cells within the pack gradually increase with use, leading to poor consistency. This weak link in the battery pack prevents the pack from fully utilizing its capacity, reducing the overall capacity of the pack. Therefore, effective balancing management of electric vehicle battery packs is crucial for improving the consistency of each cell within the pack, reducing battery capacity loss, and extending battery life and the electric vehicle's range. Summary of the Invention

[0003] This disclosure provides a balancing control method, device, equipment, and system. By calculating the Ah value of each battery in a battery pack, the method determines the balancing priority of each battery, thereby determining the balancing channel. This method takes into account the balancing priorities of different battery cells and the performance of the balancing device, improving balancing efficiency and resolving the technical issue of temperature rise in the balancing system due to heat generated by balancing resistors during balancing, which affects operating performance.

[0004] A first aspect of the present disclosure provides a balancing control method, comprising: determining the balancing ampere-hour (Ah) value of each battery in a plurality of batteries based on the voltage, current, temperature, and capacity of the plurality of batteries; grouping the plurality of batteries into at least one battery group, and determining the balancing priority of a channel in which each battery in the first battery group is located based on the balancing Ah value of each battery in the first battery group, wherein a balancing resistor is connected to the channel in which each battery is located; obtaining the temperature of the first battery group, and determining the first channel in which the first battery in the first battery group that is to start balancing is located based on the temperature, balancing priority, temperature threshold, and balancing channel threshold of the first battery group.

[0005] In some embodiments of the present disclosure, determining the balanced Ah value of each battery in a plurality of batteries based on the voltage values, current values, temperatures, and capacities of the plurality of batteries includes: obtaining the voltage value, current value, and temperature of each battery in the plurality of batteries; determining the state of charge (SOC) value of each battery in the plurality of batteries based on the voltage value, current value, and temperature; and determining the balanced Ah value of each battery in the plurality of batteries based on the SOC value, capacity, and accuracy of the SOC value of each battery in the plurality of batteries.

[0006] In some embodiments of the present disclosure, a plurality of batteries are grouped into at least one battery group, and determining the balancing priority of a channel in which each battery in the first battery group is located according to the balancing Ah value of each battery in the first battery group includes: dividing the plurality of batteries into a plurality of battery groups according to a balancing channel threshold, the plurality of battery groups including at least one first battery group; and determining the balancing priority of the channel in which each battery in the first battery group is located according to descending order of the balancing Ah value of each battery in the first battery group.

[0007] In some embodiments of the present disclosure, obtaining the temperature of the first battery group and determining the first channel where the first battery that has balancing enabled in the first battery group is located based on the temperature, the balancing priority, the temperature threshold, and the balancing channel threshold includes: obtaining the temperature of the first battery group; determining the number of balancing channels of the first battery group based on the temperature, the temperature threshold, and the balancing channel threshold of the first battery group; and determining the first channel where the first battery that has balancing enabled in the first battery group is located based on the number of balancing channels and the balancing priority.

[0008] In some embodiments of the present disclosure, determining the first channel where the first battery with balancing enabled in the first battery group is located according to the balancing channel number and the balancing priority includes: determining the channel where the first battery with balancing priority smaller than the balancing channel number is located as the first channel.

[0009] In some embodiments of the present disclosure, the method further includes: turning on the balancing switch of the first channel to release the capacity of the first battery through the balancing resistor until the released capacity of the first battery reaches the balancing Ah value of the first battery.

[0010] A second embodiment of the present disclosure proposes a balancing control device, including: a processing module for determining the balancing ampere-hour (Ah) value of each battery in a plurality of batteries based on the voltage value, current value, temperature, and capacity of the plurality of batteries; grouping the plurality of batteries into at least one battery group, and determining the balancing priority of the channel in which each battery in the first battery group is located based on the balancing Ah value of each battery in the first battery group, wherein a balancing resistor is connected to the channel in which each battery is located; obtaining the temperature of the first battery group, and determining the first channel in which the first battery in the first battery group that starts balancing is located based on the temperature of the first battery group, the balancing priority, the temperature threshold, and the balancing channel threshold.

[0011] A third aspect of the present disclosure provides a vehicle comprising the balancing control device described in the second aspect.

[0012] An embodiment of a fourth aspect of the present disclosure provides a battery pack, which includes a battery management system. The battery management system is used to execute the method described in any one of the embodiments of the first aspect of the present disclosure.

[0013] An embodiment of a fifth aspect of the present disclosure proposes a balancing control system, including a balancing module, which is used to implement the method described in any one of the embodiments of the first aspect of the present disclosure.

[0014] In summary, the balancing control method, device, equipment, and system proposed in the present disclosure include: determining the balancing ampere-hour (Ah) value of each battery in a plurality of batteries based on the voltage, current, temperature, and capacity of the plurality of batteries; grouping the plurality of batteries into at least one battery group, and determining the balancing priority of the channel in which each battery in the first battery group is located based on the balancing Ah value of each battery in the first battery group; obtaining the temperature of the first battery group, and determining the first channel in which the first battery in the first battery group to enable balancing is located based on the temperature, balancing priority, temperature threshold, and balancing channel threshold of the first battery group. The method provided in the present disclosure takes into account the balancing priority of different battery cells and the performance of the balancing device, improves balancing efficiency, and solves the technical problem in the balancing system where the heat generated by the balancing resistor during balancing causes the temperature to rise and affects the working performance.

[0015] 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 disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings herein are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the description are used to explain the principles of the present disclosure, and do not constitute an improper limitation of the present disclosure.

[0017] Figure 1 This is an application scenario of a balancing control method proposed in an embodiment of the present disclosure;

[0018] Figure 2 A flow chart of a balancing control method proposed in an embodiment of the present disclosure;

[0019] Figure 3 A flow chart of a method for determining the balanced Ah value of each battery in a plurality of batteries proposed in an embodiment of the present disclosure;

[0020] Figure 4 A flow chart of a method for determining the balancing priority of a channel where each battery in a first battery pack is located, proposed in an embodiment of the present disclosure;

[0021] Figure 5 A flow chart of a method for determining a first channel proposed in an embodiment of the present disclosure;

[0022] Figure 6 A flow chart of a method for determining a first channel proposed in an embodiment of the present disclosure;

[0023] Figure 7A flow chart of a balancing control method proposed in an embodiment of the present disclosure;

[0024] Figure 8 A flow chart of a balancing control method provided in an embodiment of the present disclosure;

[0025] Figure 9 A schematic structural diagram of a balancing control device proposed in an embodiment of the present disclosure;

[0026] Figure 10 A schematic diagram of the structure of an electronic device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0027] The following describes in detail embodiments of the present disclosure, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present disclosure, and should not be construed as limiting the present disclosure.

[0028] The following is an explanation of the professional terms used in the embodiments of the present disclosure:

[0029] 1. State of Charge (SOC), also known as remaining capacity, represents the ratio of the remaining capacity of the battery after it has been used for a period of time or has been left unused for a long time to its capacity in a fully charged state.

[0030] 2. Ampere-hour (AH): It is an indicator that reflects the capacity of the battery, which means the time of discharge at a specified current.

[0031] In the practical application of relevant balancing technologies, battery balancing systems typically use a passive balancing method. This involves connecting a fixed balancing resistor in parallel across the battery cells. When balancing is required, the battery cells are connected to the balancing resistor and discharged to achieve cell balancing. In such balancing systems, the balancing modules generate heat during operation. This heat accumulation causes module temperatures to rise, which in turn affects balancing module performance. Currently, most balancing systems reduce heat accumulation by evenly reducing the workload of the balancing modules. This results in low balancing efficiency, impacting the overall balancing performance of the system. This also fails to consider the balancing priority of each battery cell during the actual balancing process, resulting in low overall system balancing efficiency.

[0032] Therefore, in order to solve the problem that the heat generated during balancing of the balancing resistor causes the system temperature to rise and affects the working performance, the embodiment of the present disclosure provides a balancing control method, which determines the balancing priority of each battery by calculating the balancing ampere-hours of each battery cell, and determines the number of channels for battery pack balancing after obtaining the current temperature of the battery pack, thereby determining the channel where the battery to be balanced is located. This can achieve effective balancing management of the battery pack, which is beneficial to improving the consistency of each battery cell in the battery pack, reducing the capacity loss of the battery, and solving the problem that the system temperature rises and affects the system working performance when the balancing circuit generates heat.

[0033] The balancing control method provided in this application will be described in detail below with reference to the accompanying drawings.

[0034] Figure 1 This is an application scenario of a balancing control method proposed in an embodiment of the present disclosure. Figure 1 As shown, the multiple battery cells controlled by each sampling control unit 120 form a battery pack, each battery pack includes at least one battery cell 100, and the channel where each battery cell is located includes a balancing resistor 111. The balancing of the channel where the battery cell 100 is located is controlled by controlling the balancing switch 110.

[0035] Figure 2 This is a flow chart of a method for balancing control proposed in an embodiment of the present disclosure. Figure 2 As shown, the method may include the following steps.

[0036] Step 201 : determining the balanced ampere-hour (Ah) value of each battery in the plurality of batteries according to the voltage values, current values, temperatures, and capacities of the plurality of batteries.

[0037] In some embodiments, determining the balanced Ah value of each battery in the plurality of batteries may be determining the balanced Ah value of each battery cell, ie, a battery cell. The determined balanced Ah value of each battery cell may be used to determine the balancing priority of each battery cell.

[0038] In some embodiments, the SOC value of each battery can be determined by obtaining the voltage value, current value, and temperature of the battery, and the balanced Ah value of each battery can be determined through the SOC value of the battery.

[0039] In some embodiments, the soc value of the battery reflects the current remaining power of the battery and is used to calculate the balanced ampere-hour value Ah of the battery.

[0040] In some embodiments, the ampere-hour value Ah represents the capacity of the battery, and the balancing ampere-hour value Ah represents the capacity that needs to be balanced to achieve a balanced SOC of the battery.

[0041] In some embodiments, the soc value of the battery can be calculated using current integration method, open circuit voltage method, etc.

[0042] In some embodiments, by calculating the balancing ampere-hour value Ah of each battery in the plurality of batteries, the balancing order of the batteries can be sorted to determine the battery balancing strategy, that is, the channel where the battery to be balanced is located.

[0043] Step 202: Group multiple batteries into at least one battery group, and determine the balancing priority of a channel where each battery in the first battery group is located according to the balancing Ah value of each battery in the first battery group.

[0044] In some embodiments, a balancing resistor is connected to the channel where each battery is located.

[0045] In some embodiments, by grouping multiple batteries, a balancing control strategy can be determined according to the status of the batteries in each group, that is, the channels where the balanced batteries are located can be turned on.

[0046] In some embodiments, the first battery group may be each battery group of a plurality of battery groups, the first battery group including a plurality of batteries, and the balancing priority of the channel where each battery in the first battery group is located may be determined according to the balancing Ah numbers of the plurality of batteries.

[0047] In some embodiments, a battery pack may represent a sampling control unit, each sampling control unit may control multiple batteries, and the order in which the multiple batteries are balanced may be determined according to the state of each sampling control unit, that is, the balancing priority of the multiple batteries may be determined.

[0048] In some embodiments, the balancing priority of the channel where each battery is located can be determined by sorting the balancing Ah value of each battery.

[0049] For example, the channel where the battery with a larger balancing Ah value is located has a higher priority.

[0050] Step 203 : Obtain the temperature of the first battery pack, and determine the first channel where the first battery in the first battery pack with balancing enabled is located according to the temperature of the first battery pack, the balancing priority, the temperature threshold, and the balancing channel threshold.

[0051] In some embodiments, the balancing channel threshold may be the maximum number of channels that can be controlled by the sampling control unit of each battery pack, for example, the maximum number of channels that each sampling control unit can operate.

[0052] In some embodiments, by obtaining the temperature of the first battery pack, the first channel where the first battery for which balancing is enabled is located in the first battery pack can be determined according to the temperature of the first battery pack, the balancing priority of multiple batteries in the first battery pack, a set temperature threshold, i.e., the maximum operating temperature, and the balancing channel threshold. The first battery can be one or more; the first channel can be one or more.

[0053] In the above embodiment, by grouping multiple batteries and determining the balancing priority of the channels within each battery pack, the battery pack's operating temperature can be combined to determine the channels within the pack where the batteries to be balanced are located, thereby completing balancing control. This method considers the balancing priorities of different battery cells and prioritizes balancing requirements with higher priorities based on the priorities and the performance of the balancing devices, thereby improving overall system efficiency.

[0054] Figure 3 This is a flow chart of a method for determining the balanced Ah value of each battery in a plurality of batteries proposed in an embodiment of the present disclosure. Figure 2 The embodiment shown, Figure 3 Yes Figure 2 Further description of step 201 in FIG. Figure 3 As shown, the following steps are included:

[0055] Step 301: Obtain the voltage value, current value, and temperature of each battery in a plurality of batteries.

[0056] In some embodiments, obtaining the voltage value, current value, and temperature of each battery in the plurality of batteries may be obtaining the voltage value, current value, and temperature of each battery cell.

[0057] For example, the voltage value V of each battery is obtained. k , current value I k , temperature Dt k , where k represents the kth battery.

[0058] Step 302 : determining the state of charge (SOC) value of each battery in the plurality of batteries based on the voltage value, the current value, and the temperature.

[0059] In some embodiments, based on the voltage value, current value, and temperature, the SOC value of each battery in the plurality of batteries may be determined by calculating using an open circuit voltage method or a current integration method.

[0060] For example, the voltage value V of battery k is obtained k , current value I k , temperature Dt k , calculate the soc of battery k by current integration method or open circuit voltage method k Value, accordingly, calculate the soc value of each battery in the multiple batteries.

[0061] Step 303 : determining a balanced Ah value of each battery in the plurality of batteries according to the SOC value of each battery in the plurality of batteries and the accuracy of the SOC value.

[0062] In some embodiments, according to the accuracy of the SOC value of each battery, a method for calculating the balanced Ah value of each battery according to the SOC value can be determined.

[0063] In some embodiments, when the SOC value accuracy of the battery is high, the balancing target SOC value is calculated based on the maximum SOC value and the minimum SOC value among multiple battery SOC values, and then the balancing Ah value of the battery is determined based on the SOC value and the balancing target SOC value of each battery and the battery capacity.

[0064] For example, when the battery's soc accuracy is high, the maximum single cell soc max and the smallest monomer soc min Calculate the balanced target soc tgt , soc tgt =(soc max +soc min ) / 2; According to the soc value of each battery cell and the balanced target soc tgt , the capacity of the battery cell Cap, calculate the balanced Ah number of the battery cell: Ah = max ((soc-soc tgt )*Cap,0).

[0065] In some embodiments, when the accuracy of the soc value of a battery is low, the current balanced Ah value is determined based on the balanced Ah values ​​of multiple batteries at a previous moment.

[0066] For example, when the soc accuracy is low, if the battery cell channel balancing is turned on, the balanced Ah value Ah of each battery cell at the last moment is used. k-1 , the voltage V of the battery cell, the sampling control period dt, the equalization resistance R, and the calculated equalization Ah value, Ah = max (Ah k-1 -V / R*dt, 0), otherwise, Ah=Ah k-1 .

[0067] In some embodiments, the balancing priority of each battery can be determined by determining the balancing Ah value of each battery. For example, the balancing priority is determined in order of the balancing Ah value, with the battery with the larger balancing Ah value being given a higher priority.

[0068] Figure 4 This is a flow chart of a method for determining the balancing priority of the channel where each battery in the first battery pack is located, according to an embodiment of the present disclosure. Figure 2 、 Figure 3 The embodiment shown, Figure 4 Yes Figure 2 Further description of step 202 in, such as Figure 4 As shown, the following steps are included:

[0069] Step 401 : Divide a plurality of batteries into a plurality of battery groups according to a balancing channel threshold.

[0070] In some embodiments, the plurality of battery packs includes at least one first battery pack.

[0071] In some embodiments, the equalization channel threshold may be the maximum number of channels that each sampling control unit can control, for example, the maximum number of channels that each sampling control unit can operate.

[0072] In some embodiments, the multiple batteries are divided into multiple battery groups according to the balancing channel threshold. The multiple batteries may be grouped according to the maximum number of channels operated by each sampling control unit, and each group includes batteries with the maximum number of channels.

[0073] In the above embodiment, grouping according to the equalization channel threshold can ensure the system working performance and avoid exceeding the channel threshold of the sampling control unit to cause additional performance loss.

[0074] Step 402 : Determine the balancing priority of the channel where each battery in the first battery group is located according to the descending order of the balanced Ah value of each battery in the first battery group.

[0075] In some embodiments, determining the balancing priority based on the descending order of the balancing Ah value of each battery in the first battery group can be performed by sorting the multiple batteries in the first battery group in descending order according to the balancing Ah value from large to small, and setting the sorting number as the balancing priority of the channel where the battery is located.

[0076] In some embodiments, the equalization priority indicates that channels with higher priorities are equalized first. In other words, when determining which channels to enable equalization, the determination starts with the channel with the highest equalization priority.

[0077] For example, among battery cells assigned to the same sampling control unit, the balancing Ah values ​​are sorted from large to small, and the sorting number n is the balancing priority Prio of the channel where the battery is located, that is, Prio=n; if the balancing Ah is 0, the balancing priority of the channel is set to the maximum value, Prio=255.

[0078] In the above embodiment, the balancing priority is determined by sorting the batteries in the same battery pack in descending order according to their respective balanced Ah values, and the balancing scheme within the same battery pack is determined based on the balancing priorities of different batteries, that is, the balancing channel is opened.

[0079] Figure 5 This is a flow chart of the method for determining the first channel proposed in the embodiment of the present disclosure. Figure 2 、 Figure 3 、 Figure 4 The embodiment shown, Figure 5 Yes Figure 2 Step 203 is further described. Figure 5 As shown, the method includes the following steps:

[0080] Step 501: Acquire the temperature of the first battery pack.

[0081] In some embodiments, the first battery pack may be a battery pack or each battery pack in a plurality of battery packs.

[0082] In some embodiments, the temperature of the first battery pack may be an operating temperature of a sampling control unit of the first battery pack.

[0083] In some embodiments, obtaining the temperature of the first battery pack may be used to determine the number of balancing channels for the first battery pack. For example, the number of balancing channels may be determined based on the current operating temperature of the battery pack, a temperature threshold, and a balancing channel threshold.

[0084] Step 502 : Determine the number of balancing channels of the first battery group according to the temperature of the first battery group, the temperature threshold, and the balancing channel threshold.

[0085] In some embodiments, the temperature threshold may be the maximum allowable operating temperature of the sampling control unit, and the balancing channel threshold may be the maximum number of operating channels of the sampling control unit.

[0086] In some embodiments, the number of balancing channels of the first battery group may be determined according to the temperature of the first battery group, the maximum allowable temperature, and the balancing channel threshold.

[0087] For example, the maximum number of channels of the sampling control unit is nChn, and the actual temperature of the current battery pack is Deg act , the maximum allowable temperature is Deg MaxAllow , temperature derating curve Deg delta , the number of available channels m is m=min(1,max(0,(Deg MaxAllow -Deg act ) / Deg delta )) * nChn.

[0088] Step 503 : Determine the first channel where the first battery in the first battery group that starts balancing is located according to the number of balancing channels and the balancing priority.

[0089] In some embodiments, based on the determined number of balancing channels, the first channels for enabling balancing can be determined in combination with the balancing priorities of the batteries within the first battery pack.

[0090] In some embodiments, the first battery can be one battery or multiple batteries; the first channels can be one channel or multiple channels.

[0091] In some embodiments, the method for determining the first channels can be to determine the channels where the batteries with balancing priorities meeting the number of balancing channels are located as the first channels.

[0092] Exemplarily, the channels with balancing priorities less than the number of balancing channels are determined as the first channels.

[0093] In the above embodiments, by calculating the number of balancing channels for each battery pack and combining the balancing priorities, the balancing scheme for the battery pack, i.e., the channels for enabling balancing, can be determined. This method takes into account the balancing priorities of different batteries and the performance of the balancing devices, achieving an improvement in the overall efficiency of the system.

[0094] Figure 6 The flowchart of the method for determining the first channels proposed in the embodiments of the present disclosure. Based on Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 The embodiments shown, Figure 6 is a further description of step 503 in Figure 5 As shown in Figure 6 shown, the method includes the following steps:

[0095] Step 601, determine the channels where the first batteries with balancing priorities less than the number of balancing channels are located as the first channels.

[0096] In some embodiments, determining the channels where the first batteries with balancing priorities less than the number of balancing channels are located as the first channels can enable the batteries with higher balancing priorities to be balanced first, achieving the consistency of the batteries within the first battery pack.

[0097] In some embodiments, the first battery can be one or multiple.

[0098] Exemplarily, for each battery pack controlled by a sampling control unit, according to the allowed number of balancing channels m and the priorities n of each battery cell within the group, the channels where the battery cells with priorities n < m are located are allowed to enable balancing.

[0099] In the above embodiments, by enabling balancing for the batteries with higher balancing priorities, the balancing efficiency can be higher, achieving the consistency of the batteries within the first battery pack.

[0100] Figure 7This is a flow chart of a balancing control method proposed in an embodiment of the present disclosure. Figures 2 to 6 The embodiment shown, as Figure 7 As shown, the method further includes the following steps:

[0101] Step 701: Turn on the balancing switch of the first channel to release the capacity of the first battery through the balancing resistor until the released capacity of the first battery reaches the balancing Ah value of the first battery.

[0102] In some embodiments, starting balancing on the first channel may include opening a balancing switch of the first channel to connect the first battery to the balancing resistor.

[0103] In some embodiments, the balancing resistor in the first channel is used to discharge the first battery to achieve balancing of the first battery.

[0104] In some embodiments, the balancing Ah value represents the capacity of the first battery that needs to be balanced. Turning on the balancing switch of the first channel can connect the first battery to the balancing resistor, allowing the first battery to release capacity. When the released capacity of the first battery reaches the balancing Ah value, the balancing of the first battery is completed.

[0105] In summary, the present disclosure proposes a balancing control method that determines the balancing ampere-hour (Ah) value of each battery in a plurality of batteries based on the voltage, current, temperature, and capacity of the plurality of batteries; groups the plurality of batteries into at least one battery group; and determines the balancing priority of the channel in which each battery in the first battery group is located based on the balancing Ah value of each battery in the first battery group; obtains the temperature of the first battery group, and determines the first channel in which the first battery in the first battery group to enable balancing is located based on the temperature, balancing priority, temperature threshold, and balancing channel threshold of the first battery group. Through the above method, the balancing channel is determined based on the balancing priority of each battery and the performance of the balancing device, thereby achieving improved efficiency and resolving the technical problem in the battery balancing system of the related art in which the temperature rise caused by the heat generated by the balancing resistor during balancing affects the operating performance of the system.

[0106] Figure 8 A flow chart of the balancing control method provided in the embodiment of the present disclosure is shown as follows: Figure 8 As shown, the balancing control method includes the following steps:

[0107] S1: Calculate the cell SOC based on the voltage, temperature and current information of each cell.

[0108] Optionally, the calculation may be performed using a current integration method, an open circuit voltage method, or the like.

[0109] S2. Calculate the single cell balanced Ah number based on the battery single cell SOC and SOC accuracy.

[0110] Computably, the battery cell may be a first battery, and the soc accuracy may be an accuracy state of the soc value of the first battery.

[0111] When the soc accuracy state is high, the balanced target soc is calculated by the maximum single soc and the minimum single soc tgt , according to each monomer soc, monomer capacity and balanced target soc tgt Calculate the monomer equilibrium Ah number:

[0112] The equilibrium Ah of each cell is max((soc-soc tgt )*Cap, 0), where Cap is the capacity of the monomer;

[0113] When the soc precision is low, if the single channel balance is turned on, the balanced Ah number Ah of each single at the last moment k-1 , cell voltage v, sampling control period dt, balancing resistance R to calculate the balanced Ah number of the cell:

[0114] Ah=max(Ah k-1 -V / R*dt, 0), otherwise, Ah=Ah k-1 .

[0115] S3. Calculate the cell balancing priority according to the cell balancing Ah number and the battery cell allocation status of a single sampling control unit.

[0116] Among the battery cells assigned to the same sampling control unit, the balancing Ah data are sorted from large to small, and the sorting number n is the balancing priority Prio of the channel, that is, Prio=n; if the balancing Ah is 0, the balancing priority of the channel is set to the maximum value, Prio=255.

[0117] Optionally, the single sampling control unit may be a first battery pack, each sampling control unit is a battery pack, and each battery pack includes a plurality of battery cells.

[0118] S4. Calculate the number m of channels that each sampling control unit is allowed to balance simultaneously based on the operating temperature of the sampling control unit.

[0119] Optionally, the maximum number of channels nChn of the sampling control unit and the current actual temperature Deg act , maximum allowable temperature Deg MaxAllow , temperature derating curve Deg delta , calculate the number of available channels m, m = min (1, max (0, (Deg MaxAllow -Deg act ) / Deg delta )) * nChn.

[0120] Optionally, the maximum number of channels may be a equalization channel threshold.

[0121] S5. Calculate the final balanced channel:

[0122] For each sampling control unit group, based on the allowed number of balancing channels m and the priority n of each unit in the group, units with a unit priority n < m are allowed to start balancing.

[0123] Figure 9 FIG. 9 is a schematic diagram of the structure of the balancing control device 900 according to an embodiment of the present disclosure. Figure 9 As shown, the device includes:

[0124] Processing module 901 is used to determine the balancing ampere-hour (Ah) value of each battery in the multiple batteries based on the voltage values, current values, temperatures, and capacities of the multiple batteries; group the multiple batteries into at least one battery group, and determine the balancing priority of the channel where each battery in the first battery group is located based on the balancing Ah value of each battery in the first battery group; obtain the temperature of the first battery group, and determine the first channel where the first battery in the first battery group that is enabled for balancing is located based on the temperature of the first battery group, the balancing priority, the temperature threshold, and the balancing channel threshold.

[0125] The processing module is also used to obtain the voltage value, current value, and temperature of each battery in the multiple batteries; determine the state of charge (SOC) value of each battery in the multiple batteries based on the voltage value, current value, and temperature; and determine the balanced Ah value of each battery in the multiple batteries based on the SOC value, capacity, and accuracy of the SOC value of each battery in the multiple batteries.

[0126] The processing module is further configured to divide the plurality of batteries into a plurality of battery groups according to a balancing channel threshold, wherein the plurality of battery groups include at least one first battery group; and determine the balancing priority of the channel in which each battery in the first battery group is located according to the descending order of the balancing Ah value of each battery in the first battery group.

[0127] The processing module is further configured to obtain the temperature of the first battery group; determine the number of balancing channels for the first battery group based on the temperature, temperature threshold, and balancing channel threshold of the first battery group; and determine the first channel where the first battery in the first battery group that is enabled for balancing is located based on the number of balancing channels and the balancing priority.

[0128] The processing module is further configured to determine the channel where the first battery having a balancing priority lower than the number of balancing channels is located as the first channel.

[0129] The processing module is further configured to open the balancing switch of the first channel to release the capacity of the first battery through the balancing resistor until the released capacity of the first battery reaches the balancing Ah value of the first battery.

[0130] In summary, the balancing control device proposed in the present disclosure determines the balancing ampere-hour (Ah) value of each battery in a plurality of batteries based on the voltage, current, temperature, and capacity of the plurality of batteries; groups the plurality of batteries into at least one battery group, and determines the balancing priority of the channel where each battery in the first battery group is located based on the balancing Ah value of each battery in the first battery group; obtains the temperature of the first battery group, and determines the first channel where the first battery in the first battery group that is enabled for balancing is located based on the temperature, balancing priority, temperature threshold, and balancing channel threshold of the first battery group. Combining the balancing priority of the batteries and the performance of the balancing device, the channel to enable balancing in each battery group is determined, thereby improving balancing efficiency and resolving the technical problem in the balancing system where the heat generated by the balancing resistor during balancing causes the temperature to rise, affecting the working performance.

[0131] Figure 10 FIG. 1 is a structural diagram of an electronic device 1000 for implementing the above-mentioned balancing control method according to an exemplary embodiment.

[0132] Reference Figure 10 The electronic device 1000 may include one or more of the following components: a processing component 1002 , a memory 1004 , a power component 1006 , an input / output (I / O) interface 1008 , a sensor component 1010 , and a communication component 1012 .

[0133] The processing component 1002 generally controls the overall operation of the electronic device 1000, such as operations associated with display, phone calls, data communications, battery management, and logging operations. The processing component 1002 may include one or more processors 1020 to execute instructions to perform all or part of the steps of the above-described method. In addition, the processing component 1002 may include one or more modules to facilitate interaction between the processing component 1002 and other components. For example, the processing component 1002 may include a balancing module to facilitate interaction between the power supply component 1006 and the processing component 1002.

[0134] The memory 1004 is configured to store various types of data to support operations on the electronic device 1000. Examples of such data include instructions for any application or method operating on the electronic device 1000, contact data, phone book data, messages, pictures, videos, etc. The memory 1004 can be implemented by any type of volatile or non-volatile storage device, or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk, or optical disk.

[0135] The power supply assembly 1006 provides power to the various components of the electronic device 1000. The power supply assembly 1006 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to the electronic device 1000.

[0136] I / O interface 1008 provides an interface between processing component 1002 and peripheral interface modules, such as a keyboard, click wheel, buttons, etc. These buttons may include but are not limited to: a home button, volume buttons, a start button, and a lock button.

[0137] The sensor assembly 1010 includes one or more sensors for providing various aspects of the status assessment of the electronic device 1000. For example, the sensor assembly 1010 can detect the open / closed state of the electronic device 1000, the relative positioning of components, such as the display and keypad of the electronic device 1000. The sensor assembly 1010 can also detect changes in the position of the electronic device 1000 or a component of the electronic device 1000, the presence or absence of user contact with the electronic device 1000, the orientation or acceleration / deceleration of the electronic device 1000, and changes in the temperature of the electronic device 1000. The sensor assembly 1010 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor assembly 1010 may also include an optical sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 1010 may also include an accelerometer, a gyroscope, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0138] The communication component 1012 is configured to facilitate wired or wireless communication between the electronic device 1000 and other devices. The electronic device 1000 can access a wireless network based on a communication standard, such as WiFi, 2G or 3G, 4G LTE, 5G NR (NewRadio) or a combination thereof. In an exemplary embodiment, the communication component 1012 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 1012 also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology and other technologies.

[0139] In an exemplary embodiment, the electronic device 1000 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to perform the above-described methods.

[0140] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory 1004 including instructions, and the instructions can be executed by the processor 1020 of the electronic device 1000 to perform the above method. For example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0141] An embodiment of the present disclosure further provides a vehicle, comprising the balancing control device and the electronic device described in the above embodiment of the present disclosure.

[0142] An embodiment of the present disclosure further provides a battery pack, which includes a battery management system. The battery management system is used to execute the balancing control method described in the above embodiments of the present disclosure.

[0143] The embodiments of the present disclosure further provide a balancing control system, including a balancing module, which implements the balancing control method described in the above embodiments of the present disclosure.

[0144] It should be noted that the terms "first," "second," and the like in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the numbers used in this manner are interchangeable where appropriate so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure as detailed in the appended claims.

[0145] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with an embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the illustrative use of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0146] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present disclosure includes additional implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present disclosure belong.

[0147] The logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processing module, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection having one or more wires (control method), a portable computer disk cartridge (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and a portable compact disc read-only memory (CDROM). Furthermore, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or otherwise processing it in a suitable manner if necessary, and then storing it in a computer memory.

[0148] It should be understood that the various parts of the embodiments of the present disclosure can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used to implement: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0149] Those skilled in the art will understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiment.

[0150] In addition, the functional units in the various embodiments of the present disclosure may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into a module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium. The above-mentioned storage medium may be a read-only memory, a magnetic disk, an optical disk, etc.

[0151] Although the embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are exemplary and are not to be construed as limitations on the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. A balancing control method, characterized in that: The method comprises: Determining a balanced ampere-hour value (Ah) of each battery in the plurality of batteries according to voltage values, current values, temperatures, and capacities of the plurality of batteries; Grouping the plurality of batteries into at least one battery group, and determining a balancing priority of a channel where each battery in the first battery group is located according to the balancing Ah value of each battery in the first battery group, wherein a balancing resistor is connected to the channel where each battery is located; The temperature of the first battery group is obtained, and a first channel where a first battery with balancing enabled in the first battery group is located is determined according to the temperature of the first battery group, the balancing priority, a temperature threshold, and a balancing channel threshold.

2. The method according to claim 1, characterized in that Determining the balanced Ah value of each battery in the plurality of batteries according to the voltage values, current values, temperatures, and capacities of the plurality of batteries includes: Obtaining a voltage value, a current value, and a temperature of each battery in the plurality of batteries; determining a state of charge (SOC) value of each battery in the plurality of batteries based on the voltage value, the current value, and the temperature; The balanced Ah value of each of the plurality of batteries is determined according to the SOC value, the capacity, and the accuracy state of the SOC value of each of the plurality of batteries.

3. The method according to claim 1, characterized in that The step of grouping the plurality of batteries into at least one battery group and determining the balancing priority of a channel where each battery in the first battery group is located according to the balancing Ah value of each battery in the first battery group comprises: Dividing the plurality of batteries into a plurality of battery groups according to the balancing channel threshold, wherein the plurality of battery groups include at least one first battery group; The balancing priority of the channel where each battery in the first battery group is located is determined according to the descending order of the balanced Ah value of each battery in the first battery group.

4. The method according to claim 3, characterized in that The acquiring the temperature of the first battery group and determining, according to the temperature, the balancing priority, the temperature threshold, and the balancing channel threshold, the first channel where the first battery in the first battery group having balancing enabled is located includes: obtaining a temperature of the first battery pack; determining the number of balancing channels for the first battery group according to the temperature of the first battery group, the temperature threshold, and the balancing channel threshold; A first channel where a first battery with balancing enabled in the first battery group is located is determined according to the number of balancing channels and the balancing priority.

5. The method according to claim 4, characterized in that The determining, according to the number of balancing channels and the balancing priority, the first channel where the first battery in the first battery group that starts balancing is located includes: The channel where the first battery having the balancing priority lower than the number of balancing channels is located is determined as the first channel.

6. The method according to claim 5, characterized in that The method further comprises: The balancing switch of the first channel is turned on to release the capacity of the first battery through the balancing resistor until the released capacity of the first battery reaches the balancing Ah value of the first battery.

7. A balancing control device, characterized in that: include: Processing module, The processing module is used to determine the balanced ampere-hour value Ah of each battery in the multiple batteries according to the voltage value, current value, temperature and capacity of the multiple batteries; The processing module is configured to group the plurality of batteries into at least one battery group, and determine a balancing priority of a channel in which each battery in the first battery group is located according to the balancing Ah value of each battery in the first battery group, wherein a balancing resistor is connected to the channel in which each battery is located; The processing module is configured to obtain a temperature of the first battery pack, and determine a first channel where a first battery in the first battery pack that is enabled for balancing is located according to the temperature, the balancing priority, a temperature threshold, and a balancing channel threshold.

8. A vehicle, characterized in that: It comprises the balancing control device as claimed in claim 7.

9. A battery pack, characterized in that: The battery pack includes a battery management system, and the battery management system is used to execute the method according to any one of claims 1 to 6.

10. A balancing control system, characterized in that: The device comprises a balancing module, wherein the balancing module is used to implement the method according to any one of claims 1 to 6.

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