Power battery charging and discharging method based on equalization control and related device

Abstract

The invention discloses a power battery charging and discharging method based on equalization control and a related device, and the method comprises the steps: obtaining a battery SOC, a battery node real-time temperature and a battery real-time voltage of each group of battery packs in a power battery when a power battery management system receives a charging request or a discharging request of the power battery; obtaining a charging power limit value or a discharging power limit value corresponding to each battery pack; obtaining a charging power total limit value or a discharging power total limit value of the power battery; when charging operation or discharging operation is carried out, whether the real-time voltage of the battery is balanced or not is determined; and when the battery real-time voltage corresponding to each battery pack is unbalanced, determining the battery pack with the unbalanced battery real-time voltage, and carrying out equalization processing. In the embodiment of the invention, when charging or discharging is requested, the charging kilometer limit value or the discharging power limit value of the power battery is confirmed, and equalization processing is carried out in time when the real-time voltage of the battery of the battery pack is unbalanced, so that the safety of charging and discharging is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of power battery charging and discharging, and in particular to a power battery charging and discharging method based on equalization control and a related device. Background Art

[0002] A power battery is generally composed of several battery packs connected in series, and during charging and discharging, corresponding charging power or discharging power limits are set according to the actual conditions of the power battery, so as to ensure the safety of the power battery during charging and discharging; however, since the power battery is composed of several battery packs, during the repeated charging and discharging process of the power battery, it is easy to cause a voltage difference between the battery packs in the power battery. After the voltage difference exceeds the preset range, it can be regarded as a voltage imbalance between the battery packs, which may seriously affect the charging and discharging efficiency of the power battery, and also affect the charging and discharging safety of the power battery. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art. The present invention provides a power battery charging and discharging method based on equalization control and related devices, which can confirm the charging mileage limit or discharge power limit of the power battery when requesting charging or discharging, and perform equalization processing in time when the real-time voltage of the batteries in the battery pack is unbalanced to ensure the safety of charging and discharging.

[0004] In order to solve the above technical problems, an embodiment of the present invention provides a power battery charging and discharging method based on balanced control, the method comprising:

[0005] When receiving a charge request or a discharge request from the power battery, the power battery management system obtains the battery SOC, the real-time temperature of the battery node, and the real-time voltage of the battery of each battery group in the power battery;

[0006] Obtaining a charging power limit or a discharging power limit corresponding to each battery group based on the battery SOC, the real-time temperature of the battery node, and the real-time voltage of the battery of each battery group in the power battery;

[0007] The power battery management system obtains a total charging power limit value or a total discharging power limit value of the power battery based on a charging power limit value or a discharging power limit value corresponding to each battery group in the power battery;

[0008] When the power battery management system performs a charging operation or a discharging operation based on the total charging power limit value or the total discharging power limit value of the power battery, confirming whether the real-time voltages of the batteries corresponding to the battery groups are balanced;

[0009] When the real-time voltages of the batteries corresponding to the battery groups are unbalanced, the battery groups with unbalanced real-time voltages are determined, and the power battery management system performs balancing processing on the battery groups with unbalanced real-time voltages.

[0010] Optionally, when receiving a charge request or a discharge request of the power battery, the power battery management system obtains the battery SOC, the real-time temperature of the battery node, and the real-time voltage of each battery group in the power battery, including:

[0011] When receiving a charge request or a discharge request from the power battery, the power battery management system starts a real-time monitoring mode, and performs monitoring processing on each battery group of the power battery based on the real-time monitoring mode to obtain a real-time monitoring result;

[0012] The power battery management system obtains the battery SOC, the real-time temperature of the battery node and the real-time voltage of the battery of each battery group in the power battery based on the real-time monitoring result.

[0013] Optionally, obtaining a charging power limit value or a discharging power limit value corresponding to each battery group based on the battery SOC, the real-time temperature of the battery node, and the real-time voltage of the battery of each battery group in the power battery includes:

[0014] The power battery management system matches a first charging power limit value or a first discharging power limit value corresponding to each battery group in the power battery according to the battery SOC of each battery group in the power battery;

[0015] The power battery management system matches a second charging power limit value or a second discharging power limit value corresponding to each battery group according to the real-time temperature of the battery node of each battery group in the power battery;

[0016] The power battery management system matches a third charging power limit value or a third discharging power limit value corresponding to each battery group in the power battery according to the real-time battery voltage of each battery group in the power battery;

[0017] The power battery management system compares the first charging power limit, the second charging power limit and the third charging power limit or compares the first discharging power limit, the second discharging power limit and the third discharging power limit;

[0018] The power battery management system obtains a charging power limit value or a discharging power limit value corresponding to each battery group according to a comparison result of each battery group in the power battery.

[0019] Optionally, the power battery management system obtains a charging power limit value or a discharging power limit value corresponding to each battery group according to a comparison result of each battery group in the power battery, including:

[0020] The power battery management system selects the smallest one among the first charging power limit, the second charging power limit and the third charging power limit as the charging power limit according to the comparison result of each battery group in the power battery; or

[0021] The power battery management system selects a minimum of a first discharge power limit value, a second discharge power limit value and a third discharge power limit value as a discharge power limit value according to a comparison result of each battery group in the power battery.

[0022] Optionally, the power battery management system obtains a total charging power limit or a total discharging power limit of the power battery based on a charging power limit or a discharging power limit corresponding to each battery group in the power battery, including:

[0023] The power battery management system uses the charging power limit value or the discharging power limit value corresponding to each battery group in the power battery to perform cumulative summation processing to obtain a summation result;

[0024] The total charging power limit value or the total discharging power limit value of the power battery is obtained according to the summation result.

[0025] Optionally, the confirming whether the real-time voltages of the batteries corresponding to the battery groups are balanced includes:

[0026] The real-time voltages of the batteries corresponding to each battery group are sorted in order of magnitude to obtain the real-time voltage sorting result of the batteries;

[0027] Eliminating a plurality of real-time battery voltages at the head and tail of the real-time battery voltage sorting result, and performing average calculation on the remaining real-time battery voltages to obtain a voltage average value of the real-time battery voltages;

[0028] The real-time voltage of the battery corresponding to each battery group is compared with the voltage average value in sequence. When the comparison result is not within the preset value range, it is confirmed that the real-time voltage of the battery corresponding to the battery group corresponding to the comparison result is unbalanced.

[0029] Optionally, the balancing process of the battery pack with unbalanced real-time battery voltage by the power battery management system includes:

[0030] The power battery management system performs equalization processing on a battery pack with unbalanced battery real-time voltage based on an equalization control algorithm.

[0031] In addition, an embodiment of the present invention further provides a power battery charging and discharging device based on balanced control, the device comprising:

[0032] The first acquisition module is used for the power battery management system to obtain the battery SOC, the real-time temperature of the battery node and the real-time voltage of each battery group in the power battery when receiving a charge request or a discharge request of the power battery;

[0033] A second obtaining module: used for obtaining a charging power limit value or a discharging power limit value corresponding to each battery group in the power battery based on the battery SOC, the real-time temperature of the battery node and the real-time voltage of the battery;

[0034] A third obtaining module: used for the power battery management system to obtain a total charging power limit value or a total discharging power limit value of the power battery based on the charging power limit value or the discharging power limit value corresponding to each battery group in the power battery;

[0035] Confirmation module: used for confirming whether the real-time voltages of the batteries corresponding to the battery groups are balanced when the power battery management system performs charging or discharging operations based on the total charging power limit or the total discharging power limit of the power battery;

[0036] The balancing module is used to determine the battery group with unbalanced battery real-time voltage when the real-time battery voltages corresponding to the battery groups are unbalanced, and balance the battery group with unbalanced battery real-time voltage through the power battery management system.

[0037] In addition, an embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the power battery charging and discharging method as described in any one of the above is implemented.

[0038] In addition, an embodiment of the present invention further provides an electronic device, the electronic device comprising:

[0039] one or more processors;

[0040] Memory;

[0041] One or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the one or more processors, and the one or more applications are configured to: execute the power battery charging and discharging method according to any one of the above.

[0042] In an embodiment of the present invention, when a power battery management system receives a charging request or a discharging request of a power battery, it obtains the battery SOC, the real-time temperature of the battery node, and the real-time battery voltage of each battery group in the power battery; obtains the charging power limit or the discharging power limit corresponding to each battery group; obtains the total charging power limit or the total discharging power limit of the power battery; when performing a charging operation or a discharging operation, it determines whether the real-time battery voltage is balanced; when the real-time battery voltages corresponding to each battery group are unbalanced, it determines the battery group with unbalanced battery real-time voltage and performs balancing processing; when requesting charging or discharging, it realizes that the charging kilometer limit or the discharge power limit of the power battery is confirmed, and when the real-time battery voltages of the battery group are unbalanced, balancing processing is performed in time to ensure the safety of charging and discharging. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1 is a flow chart of a power battery charging and discharging method based on equalization control in an embodiment of the present invention;

[0045] Figure 2 is a flow chart of a power battery charging and discharging method based on equalization control in another embodiment of the present invention;

[0046] Figure 3 Schematic diagram of the structure of a power battery charging and discharging device based on balanced control in an embodiment of the present invention;

[0047] Figure 4 It is a schematic diagram of the structure of an electronic device in an embodiment of the present invention. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] For example, see Figure 1 , Figure 1 It is a flow chart of a power battery charging and discharging method based on equalization control in an embodiment of the present invention.

[0050] like Figure 1 As shown, a power battery charging and discharging method based on balanced control, the method comprising:

[0051] S101: When receiving a charge request or a discharge request of a power battery, the power battery management system obtains the battery SOC, the real-time temperature of the battery node, and the real-time voltage of each battery group in the power battery;

[0052] In the specific implementation process of the present invention, when the power battery management system receives a charging request or a discharging request of the power battery, it obtains the battery SOC, the real-time temperature of the battery node and the real-time voltage of the battery of each battery group in the power battery, including: when the power battery management system receives a charging request or a discharging request of the power battery, it starts the real-time monitoring mode, and monitors and processes each battery group of the power battery based on the real-time monitoring mode to obtain the real-time monitoring result; the power battery management system obtains the battery SOC, the real-time temperature of the battery node and the real-time voltage of the battery of each battery group in the power battery based on the real-time monitoring result.

[0053] Specifically, when the power battery management system receives a charging request or a discharging request of the power battery through a signal connection, it starts the real-time monitoring mode of the power battery, and controls the corresponding sensors through the real-time monitoring mode to monitor and process each battery group of the power battery in real time to obtain real-time monitoring results; then the power battery management system obtains the battery SOC of each battery group in the power battery, the real-time temperature of the battery node, and the real-time voltage of the battery through the real-time monitoring results.

[0054] S102: obtaining a charging power limit or a discharging power limit corresponding to each battery group in the power battery based on the battery SOC, the real-time temperature of the battery node, and the real-time voltage of the battery;

[0055] In a specific implementation of the present invention, the obtaining of the charging power limit or discharging power limit corresponding to each battery group based on the battery SOC, the real-time temperature of the battery node and the real-time voltage of each battery group in the power battery includes: the power battery management system matches the first charging power limit or the first discharging power limit corresponding to each battery group according to the battery SOC of each battery group in the power battery; the power battery management system matches the second charging power limit or the second discharging power limit corresponding to each battery group according to the real-time temperature of the battery node of each battery group in the power battery; the power battery management system matches the third charging power limit or the third discharging power limit corresponding to each battery group according to the real-time voltage of each battery group in the power battery; the power battery management system compares the first charging power limit, the second charging power limit and the third charging power limit or compares the first discharging power limit, the second discharging power limit and the third discharging power limit; the power battery management system obtains the charging power limit or the discharging power limit corresponding to each battery group according to the comparison result of each battery group in the power battery.

[0056] Further, the power battery management system obtains a charging power limit or a discharging power limit corresponding to each group of battery groups according to a comparison result of each group of battery groups in the power battery, including: the power battery management system selects the smallest one among the first charging power limit, the second charging power limit and the third charging power limit as the charging power limit according to the comparison result of each group of battery groups in the power battery; or, the power battery management system selects the smallest one among the first discharging power limit, the second discharging power limit and the third discharging power limit as the discharging power limit according to the comparison result of each group of battery groups in the power battery.

[0057] Specifically, the power battery management system stores the charging power limit model and the discharging power limit model corresponding to the battery pack under each battery SOC value, the real-time temperature value of the battery node, and the real-time voltage value of the battery; therefore, the power battery management system matches the corresponding charging power limit model and the discharging power limit model according to the battery SOC of each battery group in the power battery, and obtains the first charging power limit or the first discharging power limit corresponding to each battery group. Similarly, the real-time temperature of the battery node of each battery group in the power battery is matched with the corresponding charging power limit model and the discharging power limit model, and the The second charging power limit or the second discharging power limit corresponding to each battery group is obtained; the corresponding charging power limit model and the discharging power limit model are matched according to the real-time battery voltage of each battery group in the power battery, so as to obtain the third charging power limit or the third discharging power limit corresponding to each battery group; then the power battery management system will compare the first charging power limit, the second charging power limit and the third charging power limit or compare the first discharging power limit, the second discharging power limit and the third discharging power limit; finally, the charging power limit or the discharging power limit corresponding to each battery group can be obtained according to the comparison results of each battery group in the power battery.

[0058] That is, the power battery management system selects the smallest one among the first charging power limit, the second charging power limit and the third charging power limit as the charging power limit according to the comparison result of each battery group in the power battery; or, the power battery management system selects the smallest one among the first discharging power limit, the second discharging power limit and the third discharging power limit as the discharging power limit according to the comparison result of each battery group in the power battery.

[0059] S103: The power battery management system obtains a total charging power limit value or a total discharging power limit value of the power battery based on a charging power limit value or a discharging power limit value corresponding to each battery group in the power battery;

[0060] In the specific implementation process of the present invention, the power battery management system obtains the total charging power limit or the total discharging power limit of the power battery based on the charging power limit or the discharging power limit corresponding to each battery group in the power battery, including: the power battery management system uses the charging power limit or the discharging power limit corresponding to each battery group in the power battery to perform cumulative summation processing to obtain a summation result; and obtains the total charging power limit or the total discharging power limit of the power battery according to the summation result.

[0061] Specifically, in order to obtain the power limit for charging or discharging the power battery, the power battery management system needs to perform cumulative summation processing on the charging power limit or discharging power limit corresponding to each battery group in the power battery to obtain the summation result; then the summation result is used as the total charging power limit or the total discharging power limit of the power battery; during subsequent charging or discharging, the total charging power limit or the total discharging power limit of the power battery is not allowed to be exceeded; thereby ensuring the safety of charging or discharging.

[0062] S104: when the power battery management system performs a charging operation or a discharging operation based on the total charging power limit value or the total discharging power limit value of the power battery, confirming whether the real-time voltages of the batteries corresponding to the battery groups are balanced;

[0063] In the specific implementation process of the present invention, the confirmation of whether the real-time battery voltages corresponding to the various battery groups are balanced includes: sorting the real-time battery voltages corresponding to the various battery groups in order of size to obtain a battery real-time voltage sorting result; removing multiple battery real-time voltages at the head and tail of the battery real-time voltage sorting result, averaging the remaining battery real-time voltages to obtain a voltage average of the battery real-time voltages; comparing the real-time battery voltages corresponding to the various battery groups with the voltage average in turn, and when the comparison result is not within a preset value range, confirming that the real-time battery voltages corresponding to the battery group corresponding to the comparison result are unbalanced.

[0064] Specifically, the power battery management system first sorts the real-time battery voltages corresponding to each battery group in order of size to obtain the battery real-time voltage sorting result. The sorting here can be sorted from large to small or from small to large. After obtaining the battery real-time voltage sorting result, it is necessary to calculate a voltage value as a reference voltage value. At this time, it can be done by calculating the average value. However, when all data are used to calculate the average value, the average value may be too high or too low due to some abnormal data. Therefore, it is necessary to eliminate multiple battery real-time voltages at the head and tail of the battery real-time voltage sorting result. Here, 10% of the rounded-down data at the head and tail of the battery real-time voltage sorting result are eliminated, and the data eliminated by the battery real-time voltage sorting result is greater than or equal to 1; the remaining battery real-time voltages are averaged to obtain the voltage average of the battery real-time voltage; then the battery real-time voltage corresponding to each battery group is used to compare with the voltage average value in turn. When the comparison result is not within the preset value range, it is confirmed that the battery real-time voltage corresponding to the battery group corresponding to the comparison result is unbalanced; in the present technical solution, the preset value range is a comparison difference less than or equal to 0.1V.

[0065] S105: When the real-time voltages of the batteries corresponding to the battery groups are unbalanced, the battery groups with unbalanced real-time voltages are determined, and the battery groups with unbalanced real-time voltages are balanced by the power battery management system.

[0066] In the specific implementation process of the present invention, the balancing processing of the battery pack with unbalanced battery real-time voltage by the power battery management system includes: balancing the battery pack with unbalanced battery real-time voltage based on a balancing control algorithm by the power battery management system.

[0067] Specifically, when the real-time voltages of the batteries corresponding to each battery group are unbalanced, it is necessary to determine the battery group corresponding to the unbalanced real-time voltage of the battery. After determining the battery group corresponding to the unbalanced real-time voltage of the battery, the power battery management system will start the balancing control algorithm to balance the battery group with the unbalanced real-time voltage of the battery; thereby making the voltage of the corresponding battery group in a balanced state with the voltages between other battery groups.

[0068] In an embodiment of the present invention, when a power battery management system receives a charging request or a discharging request of a power battery, it obtains the battery SOC, the real-time temperature of the battery node, and the real-time battery voltage of each battery group in the power battery; obtains the charging power limit or the discharging power limit corresponding to each battery group; obtains the total charging power limit or the total discharging power limit of the power battery; when performing a charging operation or a discharging operation, it determines whether the real-time battery voltage is balanced; when the real-time battery voltages corresponding to each battery group are unbalanced, it determines the battery group with unbalanced battery real-time voltage and performs balancing processing; when requesting charging or discharging, it realizes that the charging kilometer limit or the discharge power limit of the power battery is confirmed, and when the real-time battery voltages of the battery group are unbalanced, balancing processing is performed in time to ensure the safety of charging and discharging.

[0069] For example 2, please refer to Figure 2 , Figure 2 It is a flow chart of a power battery charging and discharging method based on equalization control in another embodiment of the present invention.

[0070] like Figure 2 As shown, a power battery charging and discharging method based on balanced control, the method comprising:

[0071] S201: When receiving a charge request or a discharge request of the power battery, the power battery management system obtains the battery SOC, the real-time temperature of the battery node, and the real-time voltage of each battery group in the power battery;

[0072] S202: Obtaining a charging power limit or a discharging power limit corresponding to each battery group in the power battery based on the battery SOC, the real-time temperature of the battery node, and the real-time voltage of the battery;

[0073] S203: The power battery management system obtains a total charging power limit value or a total discharging power limit value of the power battery based on the charging power limit value or the discharging power limit value corresponding to each battery group in the power battery;

[0074] S204: sorting the real-time voltages of the batteries corresponding to the battery groups in order of magnitude to obtain a real-time voltage sorting result of the batteries;

[0075] In the specific implementation process of the present invention, the power battery management system sorts the real-time voltages of the batteries corresponding to each battery group. During the sorting process, the sorting can be performed from large to small or from small to large; thereby obtaining the real-time voltage sorting result of the batteries.

[0076] S205: removing the multiple real-time battery voltages at the head and tail of the real-time battery voltage sorting result, and performing average calculation on the remaining real-time battery voltages to obtain a voltage average value of the real-time battery voltages;

[0077] In the specific implementation process of the present invention, in order to make the calculated voltage average value more accurate and not be affected by abnormal voltage data, it is necessary to eliminate multiple battery real-time voltages at the head and tail of the battery real-time voltage sorting results, and then calculate the average of the remaining battery real-time voltages to obtain the voltage average value of the battery real-time voltage, so that the calculated voltage average value will be more accurate.

[0078] S206: comparing the real-time voltage of the battery corresponding to each battery group with the voltage average value in sequence, and when the comparison result is not within a preset value range, confirming that the real-time voltage of the battery corresponding to the battery group corresponding to the comparison result is unbalanced;

[0079] In the specific implementation process of the present invention, when the real-time voltage of the batteries corresponding to each battery group is compared with the voltage average value in turn, the real-time voltage of the batteries corresponding to each battery group is calculated by subtracting the voltage average value in turn, and then the calculation result is obtained as the comparison result, and then the comparison result is matched with the preset value to determine whether the comparison result is within the preset value range. When the comparison result is not within the preset value range, it is confirmed that the real-time voltage of the batteries corresponding to the battery group corresponding to the comparison result is unbalanced; when the comparison result is within the preset value range, it is confirmed that the real-time voltage of the batteries corresponding to the battery group corresponding to the comparison result is balanced; when the real-time voltage of the batteries in the battery group is balanced, no balancing is required, and the real-time voltage of the battery group is returned to continue to be used to confirm whether it is balanced.

[0080] S207: When the real-time battery voltages corresponding to the battery groups are unbalanced, determine the battery group with unbalanced battery real-time voltages, and perform equalization processing on the battery group with unbalanced battery real-time voltages through the power battery management system.

[0081] In an embodiment of the present invention, when a power battery management system receives a charging request or a discharging request of a power battery, it obtains the battery SOC, the real-time temperature of the battery node, and the real-time battery voltage of each battery group in the power battery; obtains the charging power limit or the discharging power limit corresponding to each battery group; obtains the total charging power limit or the total discharging power limit of the power battery; when performing a charging operation or a discharging operation, it determines whether the real-time battery voltage is balanced; when the real-time battery voltages corresponding to each battery group are unbalanced, it determines the battery group with unbalanced battery real-time voltage and performs balancing processing; when requesting charging or discharging, it realizes that the charging kilometer limit or the discharge power limit of the power battery is confirmed, and when the real-time battery voltages of the battery group are unbalanced, balancing processing is performed in time to ensure the safety of charging and discharging.

[0082] For example 3, please refer to Figure 3 , Figure 3 It is a schematic diagram of the structural composition of a power battery charging and discharging device based on balanced control in an embodiment of the present invention.

[0083] like Figure 3 As shown, a power battery charging and discharging device based on balanced control, the device comprises:

[0084] The first obtaining module 301 is used for the power battery management system to obtain the battery SOC, the real-time temperature of the battery node and the real-time voltage of each battery group in the power battery when receiving a charging request or a discharging request of the power battery;

[0085] In the specific implementation process of the present invention, when the power battery management system receives a charging request or a discharging request of the power battery, it obtains the battery SOC, the real-time temperature of the battery node and the real-time voltage of the battery of each battery group in the power battery, including: when the power battery management system receives a charging request or a discharging request of the power battery, it starts the real-time monitoring mode, and monitors and processes each battery group of the power battery based on the real-time monitoring mode to obtain the real-time monitoring result; the power battery management system obtains the battery SOC, the real-time temperature of the battery node and the real-time voltage of the battery of each battery group in the power battery based on the real-time monitoring result.

[0086] Specifically, when the power battery management system receives a charging request or a discharging request of the power battery through a signal connection, it starts the real-time monitoring mode of the power battery, and controls the corresponding sensors through the real-time monitoring mode to monitor and process each battery group of the power battery in real time to obtain real-time monitoring results; then the power battery management system obtains the battery SOC of each battery group in the power battery, the real-time temperature of the battery node, and the real-time voltage of the battery through the real-time monitoring results.

[0087] The second obtaining module 302 is used to obtain the charging power limit value or the discharging power limit value corresponding to each battery group based on the battery SOC, the battery node real-time temperature and the battery real-time voltage of each battery group in the power battery;

[0088] In a specific implementation of the present invention, the obtaining of the charging power limit or discharging power limit corresponding to each battery group based on the battery SOC, the real-time temperature of the battery node and the real-time voltage of each battery group in the power battery includes: the power battery management system matches the first charging power limit or the first discharging power limit corresponding to each battery group according to the battery SOC of each battery group in the power battery; the power battery management system matches the second charging power limit or the second discharging power limit corresponding to each battery group according to the real-time temperature of the battery node of each battery group in the power battery; the power battery management system matches the third charging power limit or the third discharging power limit corresponding to each battery group according to the real-time voltage of each battery group in the power battery; the power battery management system compares the first charging power limit, the second charging power limit and the third charging power limit or compares the first discharging power limit, the second discharging power limit and the third discharging power limit; the power battery management system obtains the charging power limit or the discharging power limit corresponding to each battery group according to the comparison result of each battery group in the power battery.

[0089] Further, the power battery management system obtains a charging power limit or a discharging power limit corresponding to each group of battery groups according to a comparison result of each group of battery groups in the power battery, including: the power battery management system selects the smallest one among the first charging power limit, the second charging power limit and the third charging power limit as the charging power limit according to the comparison result of each group of battery groups in the power battery; or, the power battery management system selects the smallest one among the first discharging power limit, the second discharging power limit and the third discharging power limit as the discharging power limit according to the comparison result of each group of battery groups in the power battery.

[0090] Specifically, the power battery management system stores the charging power limit model and the discharging power limit model corresponding to the battery pack under each battery SOC value, the real-time temperature value of the battery node, and the real-time voltage value of the battery; therefore, the power battery management system matches the corresponding charging power limit model and the discharging power limit model according to the battery SOC of each battery group in the power battery, and obtains the first charging power limit or the first discharging power limit corresponding to each battery group. Similarly, the real-time temperature of the battery node of each battery group in the power battery is matched with the corresponding charging power limit model and the discharging power limit model, and the The second charging power limit or the second discharging power limit corresponding to each battery group is obtained; the corresponding charging power limit model and the discharging power limit model are matched according to the real-time battery voltage of each battery group in the power battery, so as to obtain the third charging power limit or the third discharging power limit corresponding to each battery group; then the power battery management system will compare the first charging power limit, the second charging power limit and the third charging power limit or compare the first discharging power limit, the second discharging power limit and the third discharging power limit; finally, the charging power limit or the discharging power limit corresponding to each battery group can be obtained according to the comparison results of each battery group in the power battery.

[0091] That is, the power battery management system selects the smallest one among the first charging power limit, the second charging power limit and the third charging power limit as the charging power limit according to the comparison result of each battery group in the power battery; or, the power battery management system selects the smallest one among the first discharging power limit, the second discharging power limit and the third discharging power limit as the discharging power limit according to the comparison result of each battery group in the power battery.

[0092] A third obtaining module 303: configured for the power battery management system to obtain a total charging power limit value or a total discharging power limit value of the power battery based on the charging power limit value or the discharging power limit value corresponding to each battery group in the power battery;

[0093] In the specific implementation process of the present invention, the power battery management system obtains the total charging power limit or the total discharging power limit of the power battery based on the charging power limit or the discharging power limit corresponding to each battery group in the power battery, including: the power battery management system uses the charging power limit or the discharging power limit corresponding to each battery group in the power battery to perform cumulative summation processing to obtain a summation result; and obtains the total charging power limit or the total discharging power limit of the power battery according to the summation result.

[0094] Specifically, in order to obtain the power limit for charging or discharging the power battery, the power battery management system needs to perform cumulative summation processing on the charging power limit or discharging power limit corresponding to each battery group in the power battery to obtain the summation result; then the summation result is used as the total charging power limit or the total discharging power limit of the power battery; during subsequent charging or discharging, the total charging power limit or the total discharging power limit of the power battery is not allowed to be exceeded; thereby ensuring the safety of charging or discharging.

[0095] Confirmation module 304: used for confirming whether the real-time voltages of the batteries corresponding to the battery groups are balanced when the power battery management system performs a charging operation or a discharging operation based on the total charging power limit value or the total discharging power limit value of the power battery;

[0096] In the specific implementation process of the present invention, the confirmation of whether the real-time battery voltages corresponding to the various battery groups are balanced includes: sorting the real-time battery voltages corresponding to the various battery groups in order of size to obtain a battery real-time voltage sorting result; removing multiple battery real-time voltages at the head and tail of the battery real-time voltage sorting result, averaging the remaining battery real-time voltages to obtain a voltage average of the battery real-time voltages; comparing the real-time battery voltages corresponding to the various battery groups with the voltage average in turn, and when the comparison result is not within a preset value range, confirming that the real-time battery voltages corresponding to the battery group corresponding to the comparison result are unbalanced.

[0097] Specifically, the power battery management system first sorts the real-time battery voltages corresponding to each battery group in order of size to obtain the battery real-time voltage sorting result. The sorting here can be sorted from large to small or from small to large. After obtaining the battery real-time voltage sorting result, it is necessary to calculate a voltage value as a reference voltage value. At this time, it can be done by calculating the average value. However, when all data are used to calculate the average value, the average value may be too high or too low due to some abnormal data. Therefore, it is necessary to eliminate multiple battery real-time voltages at the head and tail of the battery real-time voltage sorting result. Here, 10% of the rounded-down data at the head and tail of the battery real-time voltage sorting result are eliminated, and the data eliminated by the battery real-time voltage sorting result is greater than or equal to 1; the remaining battery real-time voltages are averaged to obtain the voltage average of the battery real-time voltage; then the battery real-time voltage corresponding to each battery group is used to compare with the voltage average value in turn. When the comparison result is not within the preset value range, it is confirmed that the battery real-time voltage corresponding to the battery group corresponding to the comparison result is unbalanced; in the present technical solution, the preset value range is a comparison difference less than or equal to 0.1V.

[0098] The balancing module 305 is used to determine the battery group with unbalanced battery real-time voltage when the real-time battery voltages corresponding to the battery groups are unbalanced, and balance the battery group with unbalanced battery real-time voltage through the power battery management system.

[0099] In the specific implementation process of the present invention, the balancing processing of the battery pack with unbalanced battery real-time voltage by the power battery management system includes: balancing the battery pack with unbalanced battery real-time voltage based on a balancing control algorithm by the power battery management system.

[0100] Specifically, when the real-time voltages of the batteries corresponding to each battery group are unbalanced, it is necessary to determine the battery group corresponding to the unbalanced real-time voltage of the battery. After determining the battery group corresponding to the unbalanced real-time voltage of the battery, the power battery management system will start the balancing control algorithm to balance the battery group with the unbalanced real-time voltage of the battery; thereby making the voltage of the corresponding battery group in a balanced state with the voltages between other battery groups.

[0101] In an embodiment of the present invention, when a power battery management system receives a charging request or a discharging request of a power battery, it obtains the battery SOC, the real-time temperature of the battery node, and the real-time battery voltage of each battery group in the power battery; obtains the charging power limit or the discharging power limit corresponding to each battery group; obtains the total charging power limit or the total discharging power limit of the power battery; when performing a charging operation or a discharging operation, it determines whether the real-time battery voltage is balanced; when the real-time battery voltages corresponding to each battery group are unbalanced, it determines the battery group with unbalanced battery real-time voltage and performs balancing processing; when requesting charging or discharging, it realizes that the charging kilometer limit or the discharge power limit of the power battery is confirmed, and when the real-time battery voltages of the battery group are unbalanced, balancing processing is performed in time to ensure the safety of charging and discharging.

[0102] A computer-readable storage medium provided in an embodiment of the present invention stores a computer program on the computer-readable storage medium, and when the program is executed by a processor, the power battery charging and discharging method of any one of the above embodiments is implemented. Wherein, the computer-readable storage medium includes but is not limited to any type of disk (including floppy disk, hard disk, optical disk, CD-ROM, and magneto-optical disk), ROM (Read-Only Memory), RAM (Random Access Memory), EPROM (EraSable Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), flash memory, magnetic card or optical card. That is, the storage device includes any medium that can store or transmit information in a readable form by a device (for example, a computer, a mobile phone), which can be a read-only memory, a disk or an optical disk, etc.

[0103] An embodiment of the present invention further provides a computer application program, which runs on a computer and is used to execute the power battery charging and discharging method of any one of the above embodiments.

[0104] also, Figure 4 It is a schematic diagram of the structure of an electronic device in an embodiment of the present invention.

[0105] The embodiment of the present invention further provides an electronic device, such as Figure 4 The electronic device includes a processor 402, a memory 403, an input unit 404, a display unit 405 and other devices. Those skilled in the art will understand that Figure 4 The structural components of the electronic device shown do not constitute a limitation on all devices, and may include more or fewer components than shown, or combine certain components. The memory 403 can be used to store the application 401 and various functional modules, and the processor 402 runs the application 401 stored in the memory 403, thereby executing various functional applications and data processing of the device. The memory can be an internal memory or an external memory, or include both internal and external memories. The internal memory may include a read-only memory (ROM), a programmable ROM (PROM), an electrically programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a flash memory, or a random access memory. The external memory may include a hard disk, a floppy disk, a ZIP disk, a U disk, a magnetic tape, etc. The memory disclosed in the present invention includes but is not limited to these types of memories. The memory disclosed in the present invention is only used as an example and not as a limitation.

[0106] The input unit 404 is used to receive the input of the signal and the keyword input by the user. The input unit 404 may include a touch panel and other input devices. The touch panel can collect the user's touch operation on or near it (such as the user's operation on or near the touch panel using any suitable object or accessory such as a finger, stylus, etc.), and drive the corresponding connection device according to a pre-set program; other input devices may include but are not limited to one or more of a physical keyboard, a function key (such as a playback control key, a switch key, etc.), a trackball, a mouse, a joystick, etc. The display unit 405 can be used to display the information input by the user or the information provided to the user and various menus of the terminal device. The display unit 405 can be in the form of a liquid crystal display, an organic light emitting diode, etc. The processor 402 is the control center of the terminal device, which uses various interfaces and lines to connect the various parts of the entire device, and executes various functions and processes data by running or executing software programs and / or modules stored in the memory 403, and calling the data stored in the memory.

[0107] As an embodiment, the electronic device includes: one or more processors 402, a memory 403, and one or more applications 401, wherein the one or more applications 401 are stored in the memory 403 and are configured to be executed by the one or more processors 402, and the one or more applications 401 are configured to execute the power battery charging and discharging method in any one of the above-mentioned embodiments.

[0108] In an embodiment of the present invention, when a power battery management system receives a charging request or a discharging request of a power battery, it obtains the battery SOC, the real-time temperature of the battery node, and the real-time battery voltage of each battery group in the power battery; obtains the charging power limit or the discharging power limit corresponding to each battery group; obtains the total charging power limit or the total discharging power limit of the power battery; when performing a charging operation or a discharging operation, it determines whether the real-time battery voltage is balanced; when the real-time battery voltages corresponding to each battery group are unbalanced, it determines the battery group with unbalanced battery real-time voltage and performs balancing processing; when requesting charging or discharging, it realizes that the charging kilometer limit or the discharge power limit of the power battery is confirmed, and when the real-time battery voltages of the battery group are unbalanced, balancing processing is performed in time to ensure the safety of charging and discharging.

[0109] In addition, the above is a detailed introduction to a power battery charging and discharging method based on balanced control and related devices provided in an embodiment of the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A power battery charging and discharging method based on balanced control, characterized in that: The method comprises: When receiving a charge request or a discharge request from the power battery, the power battery management system obtains the battery SOC, the real-time temperature of the battery node, and the real-time voltage of the battery of each battery group in the power battery; Obtaining a charging power limit or a discharging power limit corresponding to each battery group based on the battery SOC, the real-time temperature of the battery node, and the real-time voltage of the battery of each battery group in the power battery; The power battery management system obtains a total charging power limit value or a total discharging power limit value of the power battery based on the charging power limit value or the discharging power limit value corresponding to each battery group in the power battery; When the power battery management system performs a charging operation or a discharging operation based on the total charging power limit value or the total discharging power limit value of the power battery, confirming whether the real-time voltages of the batteries corresponding to the battery groups are balanced; When the real-time voltages of the batteries corresponding to the battery groups are unbalanced, the battery groups with unbalanced real-time voltages are determined, and the power battery management system performs balancing processing on the battery groups with unbalanced real-time voltages.

2. The power battery charging and discharging method according to claim 1, characterized in that: When receiving a charge request or a discharge request of the power battery, the power battery management system obtains the battery SOC, the real-time temperature of the battery node, and the real-time voltage of each battery group in the power battery, including: When receiving a charge request or a discharge request from the power battery, the power battery management system starts a real-time monitoring mode, and performs monitoring processing on each battery group of the power battery based on the real-time monitoring mode to obtain a real-time monitoring result; The power battery management system obtains the battery SOC, the real-time temperature of the battery node and the real-time voltage of the battery of each battery group in the power battery based on the real-time monitoring result.

3. The power battery charging and discharging method according to claim 1, characterized in that: The obtaining of a charging power limit or a discharging power limit corresponding to each battery group based on the battery SOC, the real-time temperature of the battery node, and the real-time voltage of the battery of each battery group in the power battery includes: The power battery management system matches a first charging power limit value or a first discharging power limit value corresponding to each battery group in the power battery according to the battery SOC of each battery group in the power battery; The power battery management system matches a second charging power limit value or a second discharging power limit value corresponding to each battery group according to the real-time temperature of the battery node of each battery group in the power battery; The power battery management system matches a third charging power limit value or a third discharging power limit value corresponding to each battery group in the power battery according to the real-time battery voltage of each battery group in the power battery; The power battery management system compares the first charging power limit, the second charging power limit and the third charging power limit or compares the first discharging power limit, the second discharging power limit and the third discharging power limit; The power battery management system obtains a charging power limit value or a discharging power limit value corresponding to each battery group according to a comparison result of each battery group in the power battery.

4. The power battery charging and discharging method according to claim 3, characterized in that: The power battery management system obtains a charging power limit value or a discharging power limit value corresponding to each battery group according to a comparison result of each battery group in the power battery, including: The power battery management system selects the smallest one among the first charging power limit, the second charging power limit and the third charging power limit as the charging power limit according to the comparison result of each battery group in the power battery; or The power battery management system selects a minimum of a first discharge power limit value, a second discharge power limit value and a third discharge power limit value as a discharge power limit value according to a comparison result of each battery group in the power battery.

5. The power battery charging and discharging method according to claim 1, characterized in that: The power battery management system obtains a total charging power limit value or a total discharging power limit value of the power battery based on a charging power limit value or a discharging power limit value corresponding to each battery group in the power battery, including: The power battery management system uses the charging power limit value or the discharging power limit value corresponding to each battery group in the power battery to perform cumulative summation processing to obtain a summation result; The total charging power limit value or the total discharging power limit value of the power battery is obtained according to the summation result.

6. The power battery charging and discharging method according to claim 1, characterized in that: The step of confirming whether the real-time voltages of the batteries corresponding to the battery groups are balanced includes: The real-time voltages of the batteries corresponding to each battery group are sorted in order of magnitude to obtain the real-time voltage sorting result of the batteries; Eliminating a plurality of real-time battery voltages at the head and tail of the real-time battery voltage sorting result, and performing average calculation on the remaining real-time battery voltages to obtain a voltage average value of the real-time battery voltages; The real-time voltage of the battery corresponding to each battery group is compared with the voltage average value in sequence. When the comparison result is not within the preset value range, it is confirmed that the real-time voltage of the battery corresponding to the battery group corresponding to the comparison result is unbalanced.

7. The power battery charging and discharging method according to claim 1, characterized in that: The method of performing equalization processing on a battery pack with unbalanced real-time battery voltage by the power battery management system includes: The power battery management system performs equalization processing on a battery pack with unbalanced battery real-time voltage based on an equalization control algorithm.

8. A power battery charging and discharging device based on balanced control, characterized in that: The device comprises: The first acquisition module is used for the power battery management system to obtain the battery SOC, the real-time temperature of the battery node and the real-time voltage of each battery group in the power battery when receiving a charge request or a discharge request of the power battery; A second obtaining module: used for obtaining a charging power limit value or a discharging power limit value corresponding to each battery group in the power battery based on the battery SOC, the real-time temperature of the battery node and the real-time voltage of the battery; A third obtaining module: used for the power battery management system to obtain a total charging power limit value or a total discharging power limit value of the power battery based on the charging power limit value or the discharging power limit value corresponding to each battery group in the power battery; Confirmation module: used for confirming whether the real-time voltages of the batteries corresponding to the battery groups are balanced when the power battery management system performs charging or discharging operations based on the total charging power limit or the total discharging power limit of the power battery; The balancing module is used to determine the battery group with unbalanced battery real-time voltage when the real-time battery voltages corresponding to the battery groups are unbalanced, and balance the battery group with unbalanced battery real-time voltage through the power battery management system.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the power battery charging and discharging method as described in any one of claims 1 to 7 is implemented.

10. An electronic device, characterized in that: The electronic device comprises: one or more processors; Memory; One or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the one or more processors, and the one or more applications are configured to: execute the power battery charging and discharging method according to any one of claims 1 to 7.

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