CN114498836A - Charge/discharge current control method, battery management system, and storage medium - Google Patents
Charge/discharge current control method, battery management system, and storage medium Download PDFInfo
- Publication number
- CN114498836A CN114498836A CN202210096117.9A CN202210096117A CN114498836A CN 114498836 A CN114498836 A CN 114498836A CN 202210096117 A CN202210096117 A CN 202210096117A CN 114498836 A CN114498836 A CN 114498836A
- Authority
- CN
- China
- Prior art keywords
- value
- current
- preset
- battery
- maximum allowable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 55
- 238000007599 discharging Methods 0.000 claims abstract description 34
- 238000004590 computer program Methods 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims 1
- 238000004146 energy storage Methods 0.000 abstract description 19
- 230000008569 process Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
- H02J7/00716—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current in response to integrated charge or discharge current
Abstract
The embodiment of the invention relates to the technical field of energy storage, and discloses a charging current control method, which comprises the following steps: detecting the current maximum battery voltage value of the battery pack successfully operated in parallel; determining the maximum allowable charging current value of the battery pack to be a first preset value under the condition that the current maximum battery voltage value is smaller than or equal to the first preset voltage value; under the condition that the current maximum battery voltage value is larger than the first preset voltage value, adjusting the maximum allowable charging current value of the battery pack according to the current maximum battery voltage value so as to enable the maximum allowable charging current value to be smaller than the first preset value; adjusting an actual charging current of the battery pack to meet the maximum allowable charging current value. The invention provides a charging/discharging current control method, a battery management system and a storage medium, which avoid the situation that a battery is damaged due to a large current value at a charging/discharging end.
Description
Technical Field
The embodiment of the invention relates to the technical field of energy storage, in particular to a charging/discharging current control method, a battery management system and a storage medium.
Background
The electric automobile is favored by people due to the advantages of high charging speed and convenient use, but has the defects of large building area and high cost during charging. In order to overcome the defects, a portable energy storage power supply system is provided, and the pluggable battery pack is suitable for the portable energy storage power supply system. The pluggable battery pack has the advantages of small volume, convenience in carrying and convenience in use after being plugged, and is a development trend of portable power supply energy storage systems.
Since the maximum allowable charge/discharge current of the conventional pluggable battery pack is a fixed value, a large current cannot be charged/discharged at the charging or discharging end of the battery pack, which may damage the battery.
Disclosure of Invention
An object of embodiments of the present invention is to provide a charge/discharge current control method, a battery management system, and a storage medium, which avoid a situation where a battery is damaged due to a large current value at a charge/discharge end.
In order to solve the above technical problem, an embodiment of the present invention provides a charging current control method, including: detecting the current maximum battery voltage value of the battery pack successfully operated in parallel; determining the maximum allowable charging current value of the battery pack to be a first preset value under the condition that the current maximum battery voltage value is smaller than or equal to the first preset voltage value; under the condition that the current maximum battery voltage value is larger than the first preset voltage value, adjusting the maximum allowable charging current value of the battery pack according to the current maximum battery voltage value so as to enable the maximum allowable charging current value to be smaller than the first preset value; adjusting an actual charging current of the battery pack to meet the maximum allowable charging current value.
In addition, the adjusting the maximum allowable charging current value of the battery pack according to the current maximum battery voltage value to make the maximum allowable charging current value smaller than the first preset value includes: adjusting the maximum allowable charging current value of the battery pack according to the current maximum battery voltage value and a first preset strategy so as to enable the maximum allowable charging current value to be smaller than the first preset value; the first preset strategy is that the larger the current maximum battery voltage value is, the smaller the maximum allowable charging current value is.
In addition, the adjusting the maximum allowable charging current value of the battery pack according to the current maximum battery voltage value and a first preset strategy so that the maximum allowable charging current value is smaller than the first preset value includes: judging whether the current maximum battery voltage value is within a first preset voltage range, and if so, determining that the maximum allowable charging current value of the battery pack is 1/2 of the first preset value; if the current maximum battery voltage value is not within the first preset voltage range, judging whether the current maximum battery voltage value is within a second preset voltage range, and if the current maximum battery voltage value is within the second preset voltage range, determining that the maximum allowable charging current value of the battery pack is 1/3 of the first preset value; if the current maximum battery voltage value is not within the second preset voltage range, judging whether the current maximum battery voltage value is within a third preset voltage range, and if the current maximum battery voltage value is within the third preset voltage range, determining that the maximum allowable charging current value of the battery pack is 1/5 of the first preset value; if the current maximum battery voltage value is not within the third preset voltage range, judging whether the current maximum battery voltage value is within a fourth preset voltage range, and if the current maximum battery voltage value is within the fourth preset voltage range, determining that the maximum allowable charging current value of the battery pack is 1/10 of the first preset value; the voltage values in the first preset voltage range, the second preset voltage range, the third preset voltage range and the fourth preset voltage range are sequentially increased in an increasing mode, and any voltage value in the first preset voltage range, the second preset voltage range, the third preset voltage range and the fourth preset voltage range is larger than the first preset voltage value.
In addition, the number of the battery packs which are successfully paralleled is multiple, and each battery pack in the multiple battery packs corresponds to one maximum allowable charging current value; the adjusting the actual charging current of the battery pack to meet the maximum allowable charging current value comprises: respectively adjusting the actual charging current of each battery pack to meet the maximum allowable charging current value corresponding to the battery pack; or determining the total maximum allowable charging current value when the system supplies power according to the maximum allowable charging current value of each battery pack in a plurality of battery packs; adjusting the overall charging current of a plurality of the battery packs to meet the total maximum allowable charging current value.
The embodiment of the invention also provides a discharge current control method, which comprises the following steps: detecting the current minimum battery voltage value of the battery pack successfully operated in parallel; determining the maximum allowable discharging current value of the battery pack as a second preset value under the condition that the current minimum battery voltage value is greater than or equal to the second preset voltage value; under the condition that the current minimum battery voltage value is smaller than the second preset voltage value, adjusting the maximum allowable discharge current value of the battery pack according to the current minimum battery voltage value so as to enable the maximum allowable discharge current value to be smaller than the second preset value; adjusting an actual discharge current of the battery pack to meet the maximum allowable discharge current value.
In addition, the adjusting the maximum allowable discharging current value of the battery pack according to the current minimum battery voltage value to make the maximum allowable discharging current value smaller than the second preset value includes: adjusting the maximum allowable discharging current value of the battery pack according to the current minimum battery voltage value and a second preset strategy so as to enable the maximum allowable discharging current value to be smaller than the second preset value; the second preset strategy is that the smaller the current minimum battery voltage value is, the smaller the maximum allowable discharge current value is.
In addition, the adjusting the maximum allowable discharge current value of the battery pack according to the current minimum battery voltage value and a second preset strategy so that the maximum allowable discharge current value is smaller than the second preset value includes: judging whether the current minimum battery voltage value is within a fifth preset voltage range or not, and if so, determining that the maximum allowable discharge current value of the battery pack is 1/2 of the second preset value; if the current minimum battery voltage value is not within the fifth preset voltage range, judging whether the current minimum battery voltage value is within a sixth preset voltage range, and if the current minimum battery voltage value is within the sixth preset voltage range, determining that the maximum allowable discharge current value of the battery pack is 1/3 of the second preset value; if the current minimum battery voltage value is not within the fifth preset voltage range, judging whether the current minimum battery voltage value is within a seventh preset voltage range, and if the current minimum battery voltage value is within the seventh preset voltage range, determining that the maximum allowable discharge current value of the battery pack is 1/5 of the second preset value; if the current minimum battery voltage value is not within the seventh preset voltage range, judging whether the current minimum battery voltage value is within an eighth preset voltage range, and if the current minimum battery voltage value is within the eighth preset voltage range, determining that the maximum allowable discharge current value of the battery pack is 1/10 of the second preset value; the voltage values in the fifth preset voltage range, the sixth preset voltage range, the seventh preset voltage range and the eighth preset voltage range are sequentially decreased progressively, and any voltage value in the fifth preset voltage range, the sixth preset voltage range, the seventh preset voltage range and the eighth preset voltage range is smaller than the second preset voltage value.
In addition, the number of the battery packs which are successfully paralleled is multiple, and each battery pack in the multiple battery packs corresponds to one maximum allowable discharging current value; the adjusting the actual discharge current of the battery pack to meet the maximum allowable discharge current value includes: respectively adjusting the actual discharge current of each battery pack to meet the maximum allowable discharge current value of the corresponding battery pack; or, determining a total maximum allowable discharging current value when the system supplies power according to the maximum allowable discharging current value of each battery pack in a plurality of battery packs; adjusting an overall discharge current of a plurality of the battery packs to satisfy the total maximum allowable discharge current value.
An embodiment of the present invention also provides a battery management system, including: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the charging current control method described above and/or the discharging current control method described above.
Embodiments of the present invention also provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described charging current control method, and/or the above-described discharging current control method.
The embodiment of the invention provides a charging current control method, which comprises the steps of detecting the current maximum battery voltage value of a battery pack which is successfully combined, and under the condition that the current maximum battery voltage value of the battery pack which is successfully combined is smaller than or equal to a first preset voltage value, setting the maximum allowable charging current value of the battery pack as a first preset value; when the current maximum battery voltage value of the battery pack is greater than the first preset voltage value, the maximum allowable charging current value of the battery pack is adjusted according to the current maximum battery voltage value, so that the maximum allowable charging current value is smaller than the first preset value, that is, the maximum allowable charging current value of the battery pack is reduced when the current maximum battery voltage value of the battery pack is greater than the first preset voltage value; and the actual charging current of the battery pack is adjusted to meet the maximum allowable charging current value, so that the condition that the battery is damaged due to the fact that the current value is large at the charging tail end is avoided.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
FIG. 1 is a flow chart diagram of a charge current control method according to the present invention;
FIG. 2 is a detailed flowchart of step S13 of FIG. 1 according to the present invention;
FIG. 3 is a flow chart diagram of a discharge current control method according to the present invention;
FIG. 4 is a detailed flowchart of step S23 of FIG. 3 according to the present invention;
fig. 5 is a schematic diagram of the structure of a battery management system according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
A first embodiment of the present invention relates to a charging current control method including: detecting the current maximum battery voltage value of the battery pack successfully operated in parallel; determining the maximum allowable charging current value of the battery pack to be a first preset value under the condition that the current maximum battery voltage value is smaller than or equal to the first preset voltage value; under the condition that the current maximum battery voltage value is larger than the first preset voltage value, adjusting the maximum allowable charging current value of the battery pack according to the current maximum battery voltage value so as to enable the maximum allowable charging current value to be smaller than the first preset value; adjusting an actual charging current of the battery pack to meet the maximum allowable charging current value.
The core of the embodiment lies in detecting the current maximum battery voltage value of the battery pack successfully subjected to parallel operation, and under the condition that the current maximum battery voltage value of the battery pack successfully subjected to parallel operation is smaller than or equal to a first preset voltage value, the maximum allowable charging current value of the battery pack is a first preset value; when the current maximum battery voltage value of the battery pack is greater than the first preset voltage value, the maximum allowable charging current value of the battery pack is adjusted according to the current maximum battery voltage value, so that the maximum allowable charging current value is smaller than the first preset value, that is, the maximum allowable charging current value of the battery pack is reduced when the current maximum battery voltage value of the battery pack is greater than the first preset voltage value; and the actual charging current of the battery pack is adjusted to meet the maximum allowable charging current value, so that the condition that the battery is damaged due to the fact that the current value is large at the charging tail end is avoided.
The following describes the implementation details of the charging current control method of the present embodiment in detail, and the following is only provided for the convenience of understanding and is not necessary for implementing the present embodiment.
Fig. 1 is a schematic flow chart of a charging current control method in the present embodiment:
step S10: and detecting the current maximum battery voltage value of the battery pack which is successfully operated in parallel.
The battery pack in the embodiment is a pluggable battery pack and is suitable for a portable energy storage power supply system. The pluggable battery pack in the embodiment has the advantages of small size, convenience in carrying and convenience in plugging and using. When one battery pack in the portable energy storage power supply system is pulled out, other battery packs can supply power, so that the portable energy storage power supply system works normally; when a new battery pack is inserted into the portable energy storage power system, the new battery pack starts to supply power after the parallel operation is successful. The charging of each charging pack in the portable energy storage power supply System is controlled by a Battery Management System (BMS) in the portable energy storage power supply System. In this embodiment, in the charging process, the battery management system detects the current maximum battery voltage value of the battery pack that is successfully combined, and since a single battery pack may include 2 or more than 2 battery cells, the current maximum battery voltage value referred to herein refers to the current maximum battery voltage value among the plurality of battery cells in the battery pack.
Step S11: and judging whether the current maximum battery voltage value of the battery pack is greater than a first preset voltage value. If not, go to step S12; if so, go to step S13.
Step S12: and determining the maximum allowable charging current value of the battery pack as a first preset value.
Step S13: and adjusting the maximum allowable charging current value of the battery pack according to the current maximum battery voltage value, so that the maximum allowable charging current value is smaller than a first preset value.
Step S14: the actual charging current of the battery pack is adjusted to meet the maximum allowable charging current value.
Specifically for the above steps S11 to S14, the battery management system determines the maximum allowable charging current value of the battery pack as the first preset value and adjusts the actual charging current of the battery pack to satisfy the maximum allowable charging current value when detecting that the current maximum battery voltage value of the battery pack is not greater than (i.e., less than or equal to) the first preset voltage value. Under the condition that the current maximum battery voltage value of the battery pack is larger than a first preset voltage value, the maximum allowable charging current value of the battery pack is adjusted according to the current maximum battery voltage value, so that the maximum allowable charging current value is smaller than a first preset value, namely, under the condition that the current maximum battery voltage value of the battery pack is larger than the first preset voltage value, the maximum allowable charging current value of the battery pack is reduced, the actual charging current of the battery pack is adjusted to meet the reduced maximum allowable charging current value, and the condition that the battery is damaged due to the fact that the current value is still large at the charging tail end is avoided.
In this embodiment, the first preset voltage value indicates that the battery pack will reach the charging end, the current battery voltage of the battery pack exceeds the first preset voltage value, which indicates that the battery pack is charged to the charging end, and the current battery voltage of the battery pack does not exceed the first preset voltage value, which indicates that the battery pack is not charged to the charging end. Optionally, the first preset voltage value may be 96% of the overvoltage protection voltage, but in practical applications, the first preset voltage value may be set according to the performance of the practical battery pack, and is not specifically limited in this embodiment.
In this embodiment, the first preset value represents a normal charging current of a single battery pack when the battery pack charging does not reach the charging end, which is denoted as charging current a in this embodiment, and the first preset value is set according to the performance of the actual battery pack, which is not specifically limited in this embodiment.
In step S10, the current maximum battery voltage value of the battery pack is far less than the first preset voltage value in the initial charging stage, and the battery pack is far from the end of charging, so that the current maximum battery voltage value of the battery pack can be detected at a low frequency, for example: the current maximum battery voltage value of the battery pack which is successfully parallel-connected can be detected at intervals of a first time length; and then, after the battery pack is charged for a period of time, when the current maximum battery voltage value of the battery pack is still smaller than the first preset voltage value but is closer to the first preset voltage value, the battery pack is meant to reach the charging end. At this time, the current maximum battery voltage value of the battery pack may be detected at a higher frequency, for example: the current maximum battery voltage value of the battery pack which is successfully paralleled can be detected at a second time interval, wherein the second time interval is shorter than the first time interval, for example, the first time interval is 3 minutes, the second time interval is 30 seconds, the first time interval and the second time interval can be set according to actual needs, and the second time interval can be set as long as the second time interval is shorter than the first time interval.
In one embodiment, adjusting the maximum allowable charging current value of the battery pack according to the current maximum battery voltage value, so that the maximum allowable charging current value is smaller than a first preset value, includes: adjusting the maximum allowable charging current value of the battery pack according to the current maximum battery voltage value and a first preset strategy so as to enable the maximum allowable charging current value to be smaller than a first preset value; the first preset strategy is that the larger the current maximum battery voltage value is, the smaller the maximum allowable charging current value is.
The closer to the charging end, the more carefully the battery management system needs to control the charging current of the battery pack to avoid the damage of the battery caused by the larger current value. Therefore, when the maximum allowable charging current value of the battery pack is adjusted according to the current maximum battery voltage value, the larger the current maximum battery voltage value of the battery pack is, the closer the battery pack is to the charging end is indicated, and at this time, the maximum allowable charging current value needs to be correspondingly reduced, that is, the larger the current maximum battery voltage value is, the smaller the maximum allowable charging current value is, so that the safety of the battery in the charging process is ensured.
In another example, a specific flowchart of step S13 in this embodiment is shown in fig. 2, and specifically includes the following steps:
step S130: and judging whether the current maximum battery voltage value is within a first preset voltage range. If the voltage is within the first preset voltage range, executing step S131; if not, step S132 is executed.
Step S131: the maximum allowable charging current value of the battery pack is determined 1/2 to be the first preset value.
Step S132: and judging whether the current maximum battery voltage value is within a second preset voltage range. If the voltage is within the second preset voltage range, step S133 is executed; if not, go to step S134.
Step S133: the maximum allowable charging current value of the battery pack is determined 1/3 to be the first preset value.
Step S134: and judging whether the current maximum battery voltage value is within a third preset voltage range. If the voltage is within the third predetermined voltage range, go to step S135; if not, go to step S136.
Step S135: the maximum allowable charging current value of the battery pack is determined 1/5 to be the first preset value.
Step S136: and judging whether the current maximum battery voltage value is within a fourth preset voltage range. If the voltage is within the fourth preset voltage range, executing step S137; if not, go to step S138.
Step S137: the maximum allowable charging current value of the battery pack is determined 1/10 to be the first preset value.
Step S138: and finishing charging.
The voltage values in the first preset voltage range, the second preset voltage range, the third preset voltage range and the fourth preset voltage range are sequentially increased in an increasing mode, and any voltage value in the first preset voltage range, the second preset voltage range, the third preset voltage range and the fourth preset voltage range is larger than the first preset voltage value. The larger the current maximum battery voltage value of the battery pack is, the smaller the maximum allowable charging current value of the battery pack is, and the first preset voltage range, the second preset voltage range, the third preset voltage range and the fourth preset voltage range in this embodiment may be set by themselves according to actual needs, but the above conditions need to be satisfied.
The charging current control method in this embodiment is exemplified by taking a first preset voltage range of 96% to 97% of the overvoltage protection voltage, a second preset voltage range of 97% to 98% of the overvoltage protection voltage, a third preset voltage range of 98% to 99% of the overvoltage protection voltage, and a fourth preset voltage range of 99% to 100% of the overvoltage protection voltage as examples.
In the charging process, the current maximum battery voltage value of the battery pack is detected successfully, the current maximum battery voltage value of the battery pack is compared with 96% of the overvoltage protection voltage, and if the current maximum battery voltage value of the battery pack is smaller than or equal to 96% of the overvoltage protection voltage, the maximum allowable charging current value of the battery pack is determined to be A. Then, in the charging process, monitoring the current maximum battery voltage value of the battery pack, and if the current maximum battery voltage value of the battery pack is between 96% of the overvoltage protection voltage and 97% of the overvoltage protection voltage (two end values are not included), determining that the maximum allowable charging current value of the battery pack is A/2; if the current maximum battery voltage value of the battery pack is between 97% of the overvoltage protection voltage and 98% of the overvoltage protection voltage (including a left end value of 97% and not including a right end value of 98%), determining that the maximum allowable charging current value of the battery pack is A/3; if the current maximum battery voltage value of the battery pack is between 98% of the overvoltage protection voltage and 99% of the overvoltage protection voltage (including the left end value of 99% and not including the right end value of 99%), determining the maximum allowable charging current value of the battery pack to be A/5; and if the current maximum battery voltage value of the battery pack is between 99% of the overvoltage protection voltage and 100% of the overvoltage protection voltage (including the left end value of 99% and not including the right end value of 100%), determining the maximum allowable charging current value of the battery pack to be A/10. In the charging process, the actual charging current of the battery pack is adjusted according to the maximum allowable charging current value adjusted in real time, so that the condition that the battery is damaged due to the fact that the current value is still large at the charging tail end is avoided.
It should be noted that, in this embodiment, a single battery pack is taken as an example for description, in practical applications, a plurality of battery packs are generally used in the portable energy storage power supply system, and at this time, the battery management system determines the maximum allowable charging current value of each battery pack by using the same charging current control method.
The number of the battery packs which are successfully paralleled is multiple, and each battery pack in the multiple battery packs corresponds to a maximum allowable charging current value. In one example, adjusting the actual charging current of the battery pack to meet the maximum allowable charging current value includes: and respectively adjusting the actual charging current of each battery pack to meet the maximum allowable charging current value of the corresponding battery pack, thereby realizing that the battery management system independently controls the charging of each battery pack.
In another example, adjusting the actual charging current of the battery pack to meet the maximum allowable charging current value includes: determining a total maximum allowable charging current value when the system supplies power according to the maximum allowable charging current value of each battery pack in the plurality of battery packs; and adjusting the integral charging current of the plurality of battery packs to meet the total maximum allowable charging current value, so that the battery management system can uniformly control the charging of the plurality of battery packs.
The embodiment of the invention also provides a discharge current control method. A flow chart of the discharge current control method in this embodiment is shown in fig. 3, and specifically includes:
step S20: and detecting the current minimum battery voltage value of the battery pack which is successfully operated in parallel.
The battery pack in the embodiment is a pluggable battery pack and is suitable for a portable energy storage power supply system. The pluggable battery pack in the embodiment has the advantages of small size, convenience in carrying and convenience in plugging and using. When one battery pack in the portable energy storage power supply system is pulled out, other battery packs can supply power, so that the portable energy storage power supply system works normally; when a new battery pack is inserted into the portable energy storage power system, the new battery pack starts to supply power after the parallel operation is successful. The charging of each charging pack in the portable energy storage power supply System is controlled by a Battery Management System (BMS) in the portable energy storage power supply System. In this embodiment, in the discharging process, the battery management system detects the current minimum battery voltage value of the battery pack that is successfully combined, and since a single battery pack may include 2 or more than 2 battery cells, the current minimum battery voltage value referred to herein refers to the current minimum battery voltage value among the plurality of battery cells in the battery pack.
Step S21: and judging whether the current minimum battery voltage value of the battery pack is smaller than a second preset voltage value or not. If not, executing step S22; if the voltage value is smaller than the second preset voltage value, step S23 is executed.
Step S22: and determining the maximum allowable discharge current value of the battery pack as a second preset value.
Step S23: and adjusting the maximum allowable discharge current value of the battery pack according to the current minimum battery voltage value, so that the maximum allowable discharge current value is smaller than a second preset value.
Step S24: the actual discharge current of the battery pack is adjusted to meet the maximum allowable discharge current value.
Specifically, in step S21 to step S24, when detecting that the current minimum battery voltage value of the battery pack is greater than or equal to the second preset voltage value, the battery management system determines the maximum allowable discharge current value of the battery pack as the second preset value, and adjusts the actual discharge current of the battery pack to satisfy the maximum allowable discharge current value. Under the condition that the current minimum battery voltage value of the battery pack is smaller than a second preset voltage value, the maximum allowable discharge current value of the battery pack is adjusted according to the current minimum battery voltage value, so that the maximum allowable discharge current value is smaller than a second preset value, namely, under the condition that the current minimum battery voltage value of the battery pack is smaller than the second preset voltage value, the maximum allowable discharge current value of the battery pack is reduced, the actual discharge current of the battery pack is adjusted to meet the reduced maximum allowable discharge current value, and therefore the condition that the battery is damaged due to the fact that the current value is still large at the discharge end is avoided.
In this embodiment, the second preset voltage value indicates that the battery pack will reach the discharging end, the current battery voltage of the battery pack is smaller than the second preset voltage value, which indicates that the battery pack discharges to the discharging end, and the current battery voltage of the battery pack is not smaller than the second preset voltage value, which indicates that the battery pack does not discharge to the discharging end. Optionally, the second preset voltage value may be 108% of the low-voltage protection voltage, but in practical applications, the second preset voltage value may be set according to performance of the practical battery pack, and is not specifically limited in this embodiment.
In this embodiment, the second preset value represents a normal discharge current of a single battery pack when the battery pack does not reach a discharge end due to discharge, which is denoted as a discharge current B in this embodiment, and the second preset value is set according to the performance of an actual battery pack, which is not specifically limited in this embodiment.
In step S10, the current minimum battery voltage value of the battery pack is far greater than the second preset voltage value in the initial stage of discharging, and the battery pack is far from the end of discharging, so that the current minimum battery voltage value of the battery pack can be detected at a low frequency, for example: detecting the current minimum battery voltage value of the battery pack which is successfully paralleled at intervals of a third duration; and then, after the battery pack is discharged for a period of time, when the current minimum battery voltage value of the battery pack is still greater than the second preset voltage value but is closer to the second preset voltage value, the battery pack is meant to reach the discharging end. At this time, the current minimum battery voltage value of the battery pack may be detected at a higher frequency, for example: the current minimum battery voltage value of the battery pack which is successfully combined can be detected at intervals of a fourth time, wherein the fourth time is shorter than the third time, for example, the third time is 4 minutes, and the fourth time is 40 seconds, and the third time and the fourth time can be set according to actual needs, as long as the fourth time is shorter than the third time.
In one embodiment, adjusting the maximum allowable discharge current value of the battery pack according to the current minimum battery voltage value, so that the maximum allowable discharge current value is smaller than a second preset value, includes: adjusting the maximum allowable discharge current value of the battery pack according to the current minimum battery voltage value and a second preset strategy so as to enable the maximum allowable discharge current value to be smaller than a second preset value; the second preset strategy is that the smaller the current minimum battery voltage value is, the smaller the maximum allowable discharge current value is.
The closer to the discharge end, the more carefully the battery management system needs to control the discharge current of the battery pack, so as to avoid the over-discharge damage of the battery caused by the larger current value. Therefore, when the maximum allowable discharge current of the battery pack is adjusted according to the current minimum battery voltage value, the smaller the current minimum battery voltage value of the battery pack is, the closer the battery pack is to the discharge end, and at this time, the maximum allowable discharge current needs to be correspondingly reduced, that is, the smaller the current minimum battery voltage value is, the smaller the maximum allowable discharge current is, so that the safety of the battery in the discharge process is ensured.
The flowchart of step S23 in this embodiment is shown in fig. 4, and specifically includes the following steps:
step S230: and judging whether the current minimum battery voltage value is within a fifth preset voltage range. If the voltage is within the fifth preset voltage range, performing step S231; if not, go to step S232.
Step S231: the maximum allowable discharge current value of the battery pack is determined to be 1/2 of the second preset value.
Step S232: and judging whether the current minimum battery voltage value is within a sixth preset voltage range. If the voltage is within the sixth preset voltage range, step S233 is executed; if not, go to step S234.
Step S233: the maximum allowable discharge current value of the battery pack is determined to be 1/3 of the second preset value.
Step S234: and judging whether the current minimum battery voltage value is within a seventh preset voltage range. If the voltage is within the seventh preset voltage range, step S235 is executed; if not, go to step S236.
Step S235: the maximum allowable discharge current value of the battery pack is determined to be 1/5 of the second preset value.
Step S236: and judging whether the current minimum battery voltage value is within an eighth preset voltage range. If the voltage is within the eighth predetermined voltage range,
step S237 is executed; if not, go to step S238.
Step S237: the maximum allowable discharge current value of the battery pack is determined to be 1/10 of the second preset value.
Step S238: the discharge is ended.
And voltage values in the fifth preset voltage range, the sixth preset voltage range, the seventh preset voltage range and the eighth preset voltage range are sequentially decreased progressively, and any voltage value in the fifth preset voltage range, the sixth preset voltage range, the seventh preset voltage range and the eighth preset voltage range is smaller than the second preset voltage value. The smaller the current minimum battery voltage value of the battery pack is, the smaller the maximum allowable discharge current of the battery pack is, and the fifth preset voltage range, the sixth preset voltage range, the seventh preset voltage range and the eighth preset voltage range in this embodiment may be set by themselves according to actual needs, but the above conditions need to be met.
Taking a fifth preset voltage range as 108% of the low-voltage protection voltage to 105% of the low-voltage protection voltage; the discharging current control method in the present embodiment is exemplified by taking the sixth preset voltage range from 105% of the low voltage protection voltage to 103% of the low voltage protection voltage, the seventh preset voltage range from 103% of the low voltage protection voltage to 102% of the low voltage protection voltage, and the eighth preset voltage range from 102% of the low voltage protection voltage to 100% of the low voltage protection voltage as an example.
In the discharging process, the current minimum battery voltage value of the battery pack is detected successfully and is compared with 108% of the low-voltage protection voltage, and if the current minimum battery voltage value of the battery pack is larger than or equal to 108% of the low-voltage protection voltage, the maximum allowable discharging current value of the battery pack is determined to be B. Then, in the charging process, monitoring the current minimum battery voltage value of the battery pack, and if the current minimum battery voltage value of the battery pack is between 108% of the low-voltage protection voltage and 105% of the low-voltage protection voltage (excluding two end values), determining that the maximum allowable discharge current of the battery pack is B/2; if the current minimum battery voltage value of the battery pack is between 105% of the low-voltage protection voltage and 103% of the low-voltage protection voltage (including the left end value 105% and the right end value 103%), determining that the maximum allowable discharge current of the battery pack is B/3; if the current minimum battery voltage value of the battery pack is between 103% of the low-voltage protection voltage and 102% of the low-voltage protection voltage (including the left end value of 103% and the right end value of 102%), determining that the maximum allowable discharge current of the battery pack is B/5; and if the current minimum battery voltage value of the battery pack is between 102% of the low-voltage protection voltage and 100% of the low-voltage protection voltage (including the left end value of 102% and the right end value of 100%), determining the maximum allowable discharge current of the battery pack to be B/10. In the discharging process, the actual discharging current of the battery pack is adjusted according to the maximum allowable discharging current value which is adjusted in real time, so that the condition that the battery is damaged due to the fact that the discharging current value is still large at the charging end is avoided.
It should be noted that, in this embodiment, a single battery pack is taken as an example for description, in practical applications, a plurality of battery packs are generally used in the portable energy storage power supply system, and at this time, the battery management system determines the maximum allowable discharge current value of each battery pack by using the same discharge current control method.
The number of the battery packs which are successfully paralleled is multiple, and each battery pack in the multiple battery packs corresponds to one maximum allowable discharge current value. In one example, adjusting the actual discharge current of the battery pack to meet the maximum allowable discharge current value includes: and respectively adjusting the actual discharge current of each battery pack to meet the maximum allowable discharge current value of the corresponding battery pack, so that the battery management system can independently control the discharge of each battery pack.
In another example, adjusting the actual discharge current of the battery pack to meet the maximum allowable discharge current value includes: determining a total maximum allowable discharge current value when the system supplies power according to the maximum allowable discharge current value of each battery pack in the plurality of battery packs; and adjusting the overall discharge current of the plurality of battery packs to meet the total maximum allowable discharge current value, so that the battery management system can uniformly control the discharge of the plurality of battery packs.
The steps of the above methods are divided for clarity, and the implementation may be combined into one step or split some steps, and the steps are divided into multiple steps, so long as the same logical relationship is included, which are all within the protection scope of the present patent; it is within the scope of the patent to add insignificant modifications to the algorithms or processes or to introduce insignificant design changes to the core design without changing the algorithms or processes.
An embodiment of the present invention further provides a battery management system, as shown in fig. 5, including at least one processor 301; and a memory 302 communicatively coupled to the at least one processor 301; the memory 302 stores instructions executable by the at least one processor 301, and the instructions are executed by the at least one processor 301, so that the at least one processor 301 can execute the charging current control method and/or the discharging current control method.
Where the memory 302 and the processor 301 are coupled in a bus, the bus may comprise any number of interconnected buses and bridges, the buses coupling one or more of the various circuits of the processor 301 and the memory 302. The bus may also connect various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. A bus interface provides an interface between the bus and the transceiver. The transceiver may be one element or a plurality of elements, such as a plurality of receivers and transmitters, providing a means for communicating with various other apparatus over a transmission medium. The data processed by the processor 301 is transmitted over a wireless medium through an antenna, which further receives the data and transmits the data to the processor 301.
The processor 301 is responsible for managing the bus and general processing and may also provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions. And memory 302 may be used to store data used by processor 301 in performing operations.
An embodiment of the present invention further provides a computer-readable storage medium, which stores a computer program, and the computer program, when executed by a processor, implements the charging current control method and/or the discharging current control method described above.
That is, as can be understood by those skilled in the art, all or part of the steps in the method for implementing the embodiments described above may be implemented by a program instructing related hardware, where the program is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (10)
1. A charging current control method, comprising:
detecting the current maximum battery voltage value of the battery pack successfully operated in parallel;
determining the maximum allowable charging current value of the battery pack to be a first preset value under the condition that the current maximum battery voltage value is smaller than or equal to the first preset voltage value;
under the condition that the current maximum battery voltage value is larger than the first preset voltage value, adjusting the maximum allowable charging current value of the battery pack according to the current maximum battery voltage value so as to enable the maximum allowable charging current value to be smaller than the first preset value;
adjusting an actual charging current of the battery pack to meet the maximum allowable charging current value.
2. The charging current control method according to claim 1, wherein the adjusting the maximum allowable charging current value of the battery pack according to the current maximum battery voltage value to make the maximum allowable charging current value smaller than the first preset value comprises:
adjusting the maximum allowable charging current value of the battery pack according to the current maximum battery voltage value and a first preset strategy so as to enable the maximum allowable charging current value to be smaller than the first preset value;
the first preset strategy is that the larger the current maximum battery voltage value is, the smaller the maximum allowable charging current value is.
3. The charging current control method according to claim 2, wherein the adjusting the maximum allowable charging current value of the battery pack according to a first preset strategy according to the magnitude of the current maximum battery voltage value so that the maximum allowable charging current value is smaller than the first preset value comprises:
judging whether the current maximum battery voltage value is within a first preset voltage range, and if so, determining 1/2 that the maximum allowable charging current value of the battery pack is equal to the first preset value;
if the current maximum battery voltage value is not within the first preset voltage range, judging whether the current maximum battery voltage value is within a second preset voltage range, and if the current maximum battery voltage value is within the second preset voltage range, determining that the maximum allowable charging current value of the battery pack is 1/3 of the first preset value;
if the current maximum battery voltage value is not within the second preset voltage range, judging whether the current maximum battery voltage value is within a third preset voltage range, and if the current maximum battery voltage value is within the third preset voltage range, determining that the maximum allowable charging current value of the battery pack is 1/5 of the first preset value;
if the current maximum battery voltage value is not within the third preset voltage range, judging whether the current maximum battery voltage value is within a fourth preset voltage range, and if the current maximum battery voltage value is within the fourth preset voltage range, determining that the maximum allowable charging current value of the battery pack is 1/10 of the first preset value;
the voltage values in the first preset voltage range, the second preset voltage range, the third preset voltage range and the fourth preset voltage range are sequentially increased in an increasing mode, and any voltage value in the first preset voltage range, the second preset voltage range, the third preset voltage range and the fourth preset voltage range is larger than the first preset voltage value.
4. The charging current control method according to claim 1, wherein the number of the battery packs that are successfully connected in parallel is plural, and each of the plural battery packs corresponds to one of the maximum allowable charging current values;
the adjusting the actual charging current of the battery pack to meet the maximum allowable charging current value comprises:
respectively adjusting the actual charging current of each battery pack to meet the maximum allowable charging current value corresponding to the battery pack;
alternatively, the first and second electrodes may be,
determining a total maximum allowable charging current value when a system supplies power according to the maximum allowable charging current value of each battery pack in a plurality of battery packs;
adjusting the overall charging current of a plurality of the battery packs to meet the total maximum allowable charging current value.
5. A discharge current control method, comprising:
detecting the current minimum battery voltage value of the battery pack successfully operated in parallel;
determining the maximum allowable discharging current value of the battery pack as a second preset value under the condition that the current minimum battery voltage value is greater than or equal to the second preset voltage value;
under the condition that the current minimum battery voltage value is smaller than the second preset voltage value, adjusting the maximum allowable discharge current value of the battery pack according to the current minimum battery voltage value so as to enable the maximum allowable discharge current value to be smaller than the second preset value;
adjusting an actual discharge current of the battery pack to meet the maximum allowable discharge current value.
6. The discharge current control method according to claim 5, wherein the adjusting the maximum allowable discharge current value of the battery pack according to the current minimum battery voltage value to make the maximum allowable discharge current value smaller than the second preset value comprises:
adjusting the maximum allowable discharging current value of the battery pack according to the current minimum battery voltage value and a second preset strategy so as to enable the maximum allowable discharging current value to be smaller than the second preset value;
the second preset strategy is that the smaller the current minimum battery voltage value is, the smaller the maximum allowable discharge current value is.
7. The discharge current control method according to claim 6, wherein the adjusting the maximum allowable discharge current value of the battery pack according to the current minimum battery voltage value and a second preset strategy to make the maximum allowable discharge current value smaller than the second preset value comprises:
judging whether the current minimum battery voltage value is within a fifth preset voltage range or not, and if so, determining that the maximum allowable discharge current value of the battery pack is 1/2 of the second preset value;
if the current minimum battery voltage value is not within the fifth preset voltage range, judging whether the current minimum battery voltage value is within a sixth preset voltage range, and if the current minimum battery voltage value is within the sixth preset voltage range, determining that the maximum allowable discharge current value of the battery pack is 1/3 of the second preset value;
if the current minimum battery voltage value is not within the fifth preset voltage range, judging whether the current minimum battery voltage value is within a seventh preset voltage range, and if the current minimum battery voltage value is within the seventh preset voltage range, determining that the maximum allowable discharge current value of the battery pack is 1/5 of the second preset value;
if the current minimum battery voltage value is not within the seventh preset voltage range, judging whether the current minimum battery voltage value is within an eighth preset voltage range, and if the current minimum battery voltage value is within the eighth preset voltage range, determining that the maximum allowable discharge current value of the battery pack is 1/10 of the second preset value;
the voltage values in the fifth preset voltage range, the sixth preset voltage range, the seventh preset voltage range and the eighth preset voltage range are sequentially decreased progressively, and any voltage value in the fifth preset voltage range, the sixth preset voltage range, the seventh preset voltage range and the eighth preset voltage range is smaller than the second preset voltage value.
8. The discharge current control method according to claim 5, wherein the number of the battery packs that are successfully combined is plural, and each of the plural battery packs corresponds to one of the maximum allowable discharge current values;
the adjusting the actual discharge current of the battery pack to meet the maximum allowable discharge current value includes:
respectively adjusting the actual discharge current of each battery pack to meet the maximum allowable discharge current value of the corresponding battery pack;
alternatively, the first and second electrodes may be,
determining a total maximum allowable discharge current value when a system supplies power according to the maximum allowable discharge current value of each battery pack in a plurality of battery packs;
adjusting an overall discharge current of a plurality of the battery packs to satisfy the total maximum allowable discharge current value.
9. A battery management system, comprising:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the charge current control method of any one of claims 1 to 4 and/or the discharge current control method of any one of claims 5 to 8.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out a charging current control method according to any one of claims 1 to 4 and/or a discharging current control method according to any one of claims 5 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210096117.9A CN114498836A (en) | 2022-01-26 | 2022-01-26 | Charge/discharge current control method, battery management system, and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210096117.9A CN114498836A (en) | 2022-01-26 | 2022-01-26 | Charge/discharge current control method, battery management system, and storage medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114498836A true CN114498836A (en) | 2022-05-13 |
Family
ID=81475933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210096117.9A Pending CN114498836A (en) | 2022-01-26 | 2022-01-26 | Charge/discharge current control method, battery management system, and storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114498836A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116053618A (en) * | 2022-12-30 | 2023-05-02 | 蜂巢能源科技(无锡)有限公司 | Energy storage management system, control method and battery energy storage device |
-
2022
- 2022-01-26 CN CN202210096117.9A patent/CN114498836A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116053618A (en) * | 2022-12-30 | 2023-05-02 | 蜂巢能源科技(无锡)有限公司 | Energy storage management system, control method and battery energy storage device |
| CN116053618B (en) * | 2022-12-30 | 2023-12-05 | 蜂巢能源科技(无锡)有限公司 | Energy storage management system, control method and battery energy storage device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8030902B2 (en) | Method for charging battery module in multiple stages | |
| US9356452B2 (en) | Method for equalizing different states of charge of batteries | |
| US8022670B2 (en) | Method for charging battery module | |
| DE69936991T2 (en) | Control method for battery charging of an electric vehicle | |
| JP2007325324A (en) | Charging system, battery pack and its charging method | |
| CN114498836A (en) | Charge/discharge current control method, battery management system, and storage medium | |
| CN110601283A (en) | Charging method and system | |
| WO2013169493A1 (en) | Methods and systems for battery management and charger control | |
| CN110690752B (en) | BMS management method for multi-battery pack parallel control | |
| JP5974882B2 (en) | Voltage balance control device | |
| WO2020088424A1 (en) | Charge and discharge control method and apparatus for terminal, and storage medium and electronic apparatus | |
| CN111211381B (en) | Method and device for controlling discharge of lithium battery at low temperature | |
| JP2002247777A (en) | Charge control device of battery pack | |
| CN111564857B (en) | Parallel battery pack control system, method and device | |
| CN116331065A (en) | Power battery power correction method, vehicle and storage medium | |
| CN112744084B (en) | Torque control method and device, vehicle, electronic device, and storage medium | |
| CN115276181A (en) | Parallel operation control method, device and equipment of battery pack and storage medium | |
| EP4020751A1 (en) | Battery control device and mobile battery | |
| CN111354988A (en) | Lithium dendrite elimination method and device and computer readable storage medium | |
| CN115051446A (en) | Charging and discharging control method, control equipment and power supply system | |
| CN114583771A (en) | Battery pack parallel control method, device and equipment | |
| CN114604130B (en) | Vehicle charging method, system, electronic device and readable storage medium | |
| CN112086700B (en) | Method, device and computer equipment for dynamically regulating floating charge current of lead-acid storage battery | |
| CN114301050B (en) | Control method, terminal and storage medium of uninterruptible power supply rectifying module | |
| US20230063011A1 (en) | Vehicle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20240123 Address after: Room 401, 4th Floor, Building 5, No. 218 Mingnan Road, Songjiang District, Shanghai, 2016 Applicant after: Shanghai Anku Smart Energy Co.,Ltd. Country or region after: China Address before: 201613 room 103, building 2, No. 218, Mingnan Road, Songjiang District, Shanghai Applicant before: Shanghai anku innovative energy Co.,Ltd. Country or region before: China |
|
| TA01 | Transfer of patent application right |