Storage battery charging management method and system

Abstract

The invention relates to the technical field of storage battery charging management, and provides a storage battery charging management method and system. The storage battery charging management method is used for storage battery pack charging management of a direct current system, and comprises the following steps: acquiring charging current of each storage battery pack, and judging whether the charging current of each storage battery pack is out of control or not; recording the storage battery pack with out-of-control charging current as an out-of-control pack; sorting the out-of-control groups according to a first sorting condition to obtain a first sorting result; carrying out first step-down charging on the out-of-control groups according to the first sorting result until each out-of-control group enters a constant-voltage charging stage; under the condition that each out-of-control group enters the constant-voltage charging stage, sorting the out-of-control groups according to a second sorting condition to obtain a second sorting result; and carrying out second-time voltage reduction charging on the out-of-control groups according to a second-time sorting result until each out-of-control group enters a floating charging stage. The storage battery charging management method is beneficial to improving the charging safety of the storage battery pack of the direct current system.

Description

Technical Field

[0001] The present invention relates to the technical field of battery charging management, and particularly relates to a battery charging management method and system. Background Art

[0002] DC systems usually use battery packs as backup power supply means when the main power supply system fails. Whether the battery pack can work properly directly affects the safety of the DC system. Taking the power industry as an example, the communication power supply uses 24 2V battery monomers in series to provide backup power for the communication system, and the DC dispatching control system uses 52 or 104 2V battery monomers in series to provide backup power for the dispatching operation system.

[0003] In a DC system, when the charger cannot obtain accurate current data and cannot perform power control on the discharging device, the charger will charge the battery with the set constant output voltage at the maximum power, that is, the charging current out-of-control phenomenon occurs. The out-of-control of the battery charging current easily leads to dangers such as battery damage, short circuit and explosion. The existing battery charging management system cannot detect the out-of-control of the charger charging current in time and access the control, which is not conducive to improving the safety of the battery pack charging. Summary of the Invention

[0004] In view of this, the present invention aims to propose a battery charging management method to improve the safety of the battery pack charging in the DC system.

[0005] To achieve the above object, the technical solution of the present invention is realized as follows:

[0006] A battery charging management method for managing the charging of a battery pack in a DC system, the management method includes:

[0007] Obtain the real-time charging current of each battery pack, and judge whether the real-time charging current of each battery pack is out of control;

[0008] Record the battery pack with out-of-control charging current as the out-of-control group;

[0009] Sort the out-of-control groups according to the first sorting condition to obtain the first sorting result;

[0010] Perform the first step-down charging on the out-of-control groups according to the first sorting result until each out-of-control group enters the constant voltage charging stage;

[0011] When each out-of-control group enters the constant voltage charging stage, sort the out-of-control groups according to the second sorting condition to obtain the second sorting result;

[0012] Perform a second step-down charging on the out-of-control groups according to the second sorting result until each out-of-control group enters the floating charging stage.

[0013] Further, obtaining the charging current of each battery pack and determining whether the charging current of each battery pack is out of control includes: obtaining the real-time charging current of each battery pack and comparing the real-time charging current of each battery pack with a first current threshold; when the real-time charging current is greater than the first current threshold and less than a second current threshold, issuing a warning of excessive charging current; when the real-time charging current is greater than the second current threshold, determining that the charging current of the battery pack is out of control.

[0014] Further, the first current threshold is the I10 current value of each battery pack; and / or, the second current threshold is the n*I10 current value of each battery pack, where 1 < n < 2.

[0015] Further, the first sorting condition includes comparing the group voltages of each out-of-control group, and sorting each out-of-control group in ascending order according to the group voltage.

[0016] Further, when the group voltages are equal, sort according to the I10 current value of each out-of-control group, and sort each out-of-control group in descending order according to the I10 current value of the out-of-control group.

[0017] Further, when the group voltage and the I10 current value of the out-of-control group are both equal, when recording the battery pack with charging out of control as the out-of-control group, number each out-of-control group and sort each out-of-control group in the order of the numbers.

[0018] Further, the second sorting condition includes comparing the I10 current values of each out-of-control group and sorting in descending order according to the I10 current value.

[0019] Further, when the I10 current values of the out-of-control groups are equal, when recording the battery pack with charging out of control as the out-of-control group, number each out-of-control group and sort each out-of-control group in the order of the numbers.

[0020] Further, when the step-down amplitude of the first step-down charging is 0 and the real-time charging current is less than the I10 current value of each out-of-control group, the out-of-control group enters the constant voltage charging stage; and / or, when the charging current of each out-of-control group is the u*I10 current value and 0 < u < 1, the out-of-control group enters the floating charging stage.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] (1) The battery charging management method described in the present invention can intervene in the control when the charging current of the battery pack gets out of control by judging whether the charging current of the battery pack is out of control, and sort the out-of-control groups according to the first sorting condition, which is beneficial to arranging the priorities when multiple battery packs are out of control, and charging the out-of-control groups according to the priorities, charging the out-of-control groups to the constant voltage charging stage, sorting the out-of-control groups according to the second sorting condition, and charging the out-of-control groups to the floating charge state. By adopting the method of step-down charging, the risk of out-of-control charging current can be eliminated, which is beneficial to improving the safety of battery pack charging.

[0023] (2) By setting the first current threshold and the second current threshold, and obtaining the real-time charging current of each battery pack, and comparing it with the first current threshold and the second current threshold, it is beneficial to better judge whether the real-time charging current of the battery pack is out of control, which is helpful for the design and implementation.

[0024] (3) By setting the first current threshold as the I10 current value of each battery pack, it is beneficial to judge whether the charging current of the battery pack is in a normal state. By setting the second current threshold as n*I10, and 1 < n < 2, it is beneficial to better set the threshold of out-of-control charging current, which is helpful for intervening in the control of the charging current magnitude and is helpful for the design and implementation.

[0025] (4) By comparing the group voltages of each out-of-control group and sorting each out-of-control group from low to high according to the group voltage, it is beneficial to avoid the generation of inter-group circulating current when charging the out-of-control groups, which is helpful for better improving the safety of battery pack charging and is helpful for the design and implementation.

[0026] (5) By sorting according to the I10 current value of each out-of-control group when the group voltages are equal, it is helpful to preferentially charge the battery packs with larger capacity, which is beneficial to ensuring the charging efficiency and is helpful for the design and implementation.

[0027] (6) By numbering each out-of-control group and sorting the charging according to the numbering order, it is helpful to charge each out-of-control group in a certain order when the group voltage and the I10 current value are both equal, which is beneficial to the orderly progress of the charging process and is helpful for the design and implementation.

[0028] (7) By comparing the I10 current values of each out-of-control group, it is helpful to first charge the out-of-control groups with larger capacity to the floating charge stage, which is beneficial to ensuring the charging efficiency of the battery pack and is helpful for the design and implementation.

[0029] (8) By numbering each out-of-control group and sorting the charging according to the numbering order, it is helpful to charge each out-of-control group in a certain order when the I10 current values are equal, which is beneficial to the orderly progress of the charging process and is helpful for the design and implementation.

[0030] (9) The voltage reduction amplitude of the first step-down charging is made 0, and the real-time charging current is less than the I10 current value of each out-of-control group. The out-of-control group enters the constant voltage charging stage, which is conducive to determining the timing of the end of the first step-down charging. The charging current of each out-of-control group is u*I10, where 0 < u < 1. The out-of-control group enters the floating charge stage, which is conducive to determining the end timing of the second step-down charging, and is conducive to improving the safety when the out-of-control group enters the floating charge stage, and is conducive to the design and implementation.

[0031] The present invention also provides a battery charging management system, including a memory and a processor. Computer-readable instructions are stored on the memory. When the computer-readable instructions are executed by the processor, the battery charging management method as described above is implemented.

[0032] The battery charging management system and the battery charging management method according to the present invention have the same beneficial effects as those of the prior art, so they will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0034] Figure 1 is a flowchart of the battery charging management method according to an embodiment of the present invention;

[0035] Figure 2 is a schematic diagram of the composition of the battery charging management system according to an embodiment of the present invention;

[0036] Description of the reference numerals:

[0037] 10. Management system; 20. Memory; 30. Processor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present application. However, those skilled in the art should understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application.

[0039] It should be understood that when used in the specification and appended claims of the present application, the term "comprising" indicates the presence of the described features, wholes, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0040] It should also be understood that the term "and / or" used in the specification and appended claims of this application refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0041] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when", "once", "in response to determining", or "in response to detecting" depending on the context. Similarly, the phrase "if determined" or "if [the described condition or event] is detected" can be interpreted as meaning "once determined", "in response to determining", "once [the described condition or event] is detected", or "in response to detecting [the described condition or event]" depending on the context.

[0042] In addition, in the description of the specification and appended claims of this application, the terms "first", "second", "third", etc. are only used for differential description and cannot be understood as indicating or implying relative importance.

[0043] Reference to "one embodiment" or "some embodiments" etc. described in the specification of this application means that a specific feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of this application. Thus, statements such as "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments", etc. that appear in different places in this specification do not necessarily all refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in another way. The terms "comprising", "including", "having" and their variants all mean "including but not limited to", unless otherwise specifically emphasized in another way.

[0044] The present invention will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0045] An embodiment of the first aspect of the present invention provides a method for managing the charging of a storage battery, which is applied to the charging management of a storage battery pack in a DC system and intervenes to control the charging current when the charging current of the storage battery pack gets out of control, so as to improve the safety of charging the storage battery pack.

[0046] In the prior art, a storage battery pack is usually used as a backup power supply means when the main power supply system fails in a DC system. After the storage battery discharges, it needs to be charged by a charger. In order to ensure the safety of charging the storage battery, the current charger usually uses a three-stage charging method to charge the storage battery, that is: first, constant current charging is carried out with I10 current, then constant voltage charging is carried out with a constant charging voltage, and finally small current floating charge is used to ensure that the storage battery is fully charged.

[0047] When the charger cannot obtain accurate current data and is unable to perform power control on the discharging device, the charger will charge the battery with the set constant output voltage at the maximum power, that is, the charging current out-of-control phenomenon occurs. The charging current out-of-control phenomenon will lead to safety risks of the battery (such as bulging, cracking, electrolyte leakage, thermal runaway, etc.), and may cause the charger to be overloaded, resulting in the loss of power supply to the DC load. The existing battery charging management system cannot detect the out-of-control charging current of the charger in time and connect to control, which is not conducive to ensuring the safety of battery charging.

[0048] In view of this, in order to overcome the deficiencies in the prior art, in the battery charging management method of this embodiment, combined with Figure 1 As shown, in the overall design, the management method includes the following steps:

[0049] Step S1: Obtain the real-time charging current of each battery pack, and judge whether the real-time charging current of each battery pack is out of control.

[0050] Among them, in this step S1, by obtaining the charging current of each battery pack, it is possible to judge whether the charging current is out of control based on the charging current of each battery pack. When obtaining the charging current, for example, the charging current of the battery pack can be detected by connecting an ammeter in series between the battery pack and the charger. In addition, in this step S1, in order to better judge whether the charging current of each battery pack is out of control, the following steps are also included:

[0051] Step S11: Obtain the real-time charging current of each battery pack, and compare the real-time charging current of each battery pack with the first current threshold.

[0052] Among them, in this step S11, the real-time charging current of each battery pack can be detected, for example, by an ammeter connected in series between the battery pack and the charger. The first current threshold can be, for example, the I10 current value of each battery pack (that is, the 10-hour rate discharge current value of each battery pack).

[0053] Step S12: When the real-time charging current is greater than the first current threshold and less than the second current threshold, issue a warning of too high charging current.

[0054] Among them, in this step S12, the second current threshold is n*I10, 1 < n < 2, and n is the set protection multiple. The smaller the protection multiple, the more sensitive it is to the change of the charging current of the battery pack. However, if the protection multiple is too small, it may intervene in controlling the charging current of the battery pack due to the charging current fluctuation. Therefore, in this embodiment, n can be set to 1.5, for example. When the staff obtains the information of too high charging current warning, they should check the equipment and eliminate the warning after the charging current returns to normal.

[0055] Step S13: When the real-time charging current is greater than the second current threshold, it is determined that the charging current of the battery pack is out of control.

[0056] Among them, in this step S13, when the real-time charging current exceeds the second current threshold, the charging current is in an excessive state. At this time, an alarm of out-of-control charging current needs to be issued, and the charging current is intervened to control to ensure the safety of battery charging. And the alarm of out-of-control charging current needs to be manually eliminated by the staff after troubleshooting.

[0057] Step S2: Record the battery pack with out-of-control charging current as the out-of-control group.

[0058] Among them, in this step S2, when recording the battery pack with out-of-control charging current as the out-of-control group, the recorded out-of-control groups are sorted in order. When the group voltage and I10 current value of the out-of-control groups are equal during charging, the out-of-control groups are charged in order.

[0059] Step S3: Sort the out-of-control groups according to the first sorting condition to obtain the first sorting result.

[0060] Among them, in this step S3, the first sorting condition includes comparing the group voltages of each out-of-control group and sorting each out-of-control group in ascending order of group voltage, which is beneficial to give priority to charging the battery pack with a lower group voltage to eliminate the inter-group circulating current. When the group voltages are equal, the first sorting condition also includes sorting each out-of-control group in descending order of the I10 current value of each out-of-control group, so as to facilitate giving priority to charging the out-of-control group with a larger capacity to ensure the charging efficiency. When the group voltage and I10 current value are both equal, each out-of-control group is charged according to the serial number of each out-of-control group to ensure that each out-of-control group is charged in order.

[0061] Step S4: Perform the first step-down charging on the out-of-control groups according to the first sorting result until each out-of-control group enters the constant voltage charging stage.

[0062] Among them, in this step S4, when performing step-down charging, for example, the step-down module can be connected in series between the out-of-control group and the charging current to perform step-down charging. And when the step-down amplitude of the first step-down charging is 0 and the real-time charging current is less than the I10 current value of each out-of-control group, the first step-down charging ends, the group voltages of each out-of-control group are equal, and each out-of-control group enters the constant voltage charging stage.

[0063] Step S5: When each out-of-control group enters the constant voltage charging stage, sort the out-of-control groups according to the second sorting condition to obtain the second sorting result.

[0064] Among them, in step S5, during the second sorting, the group voltages of all out-of-control groups are in an equal state. Therefore, at this time, the out-of-control groups are sorted in descending order of the I10 current value to preferentially charge the battery groups with larger capacities to improve the charging efficiency. When the I10 current values of all out-of-control groups are equal, charging is performed according to the serial numbers of the out-of-control groups to ensure that the out-of-control groups are charged in sequence.

[0065] Step S6: Perform a second step-down charging on the out-of-control groups according to the result of the second sorting until all out-of-control groups enter the floating charge stage.

[0066] Among them, in this step S6, the second step-down charging can also be performed by using the above-mentioned step-down module connected in series between the charger and the battery group. When the charging current of each out-of-control group is the u*I10 current value and 0 < u < 1, the out-of-control group enters the floating charge stage. In this embodiment, u can be, for example, 0.2.

[0067] It should be noted that when performing the first sorting and the second sorting, if there are still newly out-of-control charging currents of battery groups, the newly out-of-control battery groups with charging current are classified into the waiting sequence. After the second step-down charging of all current out-of-control groups is completed, the battery groups in the waiting sequence are sorted for the first and second times, and the first step-down charging and the second step-down charging are performed according to the sorting results.

[0068] It should be noted that for the battery charging management method of this embodiment, based on the above various exemplary implementation forms, in specific implementation, as a preferred embodiment, it is still Figure 1 As shown, this management method includes:

[0069] Obtain the real-time charging currents of all battery groups, and compare the real-time charging currents of all battery groups with the I10 current values of all battery groups.

[0070] When the real-time charging current of each battery group is greater than the I10 current value of each battery group and less than 1.5 times the I10 current value, an early warning of too high charging current is issued, and the staff is notified for handling.

[0071] When the real-time charging current is greater than 1.5 times the I10 current value, it is determined that the charging current of the battery group is out of control, an alarm for out-of-control charging current is issued, the staff is notified for handling, and the step-down module is intervened to control the charging current.

[0072] Record the battery groups with out-of-control charging current as out-of-control groups, and number the out-of-control groups according to the recording order.

[0073] Compare the group voltages of each out-of-control group, and sort the out-of-control groups in ascending order. When the group voltages of each out-of-control group are the same, compare the I10 current values of each out-of-control group, and sort the out-of-control groups in descending order. When the group voltage and the I10 current value are both equal, sort the out-of-control groups in the order of the numbers, so as to obtain the first sorting result.

[0074] According to the first sorting result, perform the first step-down charging on the out-of-control groups in sequence until the step-down amplitude of the step-down module is 0 and the charging current is less than I10, then complete the first step-down charging and enter the constant voltage charging stage.

[0075] Compare the I10 current values of each out-of-control group, and sort the out-of-control groups in descending order. When the I10 current values are all equal, sort the out-of-control groups in the order of the numbers, so as to obtain the second sorting result.

[0076] According to the second sorting result, perform the second step-down charging on the out-of-control groups in sequence until the charging current is 0.2 times the I10 current value, then complete the second step-down charging and enter the floating charge charging stage.

[0077] In the above preferred embodiment, the first current threshold, the second current threshold, the first sorting condition, the second sorting condition, etc. can still refer to the descriptions in the above various exemplary embodiments. And in this preferred embodiment, the first current threshold, the second current threshold, the first sorting condition, the second sorting condition, etc., based on the beneficial effects brought by their designs, can also refer to the descriptions in the above various exemplary embodiments.

[0078] The battery charging management method of this embodiment adopts the above design. By judging whether the charging current of the battery pack is out of control, it can intervene in the control when the charging current of the battery pack is out of control, and sort the out-of-control groups through the first sorting condition, which is beneficial to arranging the priorities when multiple battery packs are out of control, and charging the out-of-control groups according to the priorities, charging the out-of-control groups to the constant voltage charging stage. Through the second sorting condition, the priorities of the out-of-control groups are sorted, and the out-of-control groups are charged to the floating charge state. By adopting the method of step-down charging, the risk of out-of-control charging current can be eliminated, which is beneficial to improving the safety of battery pack charging.

[0079] An embodiment of the second aspect of the present invention provides a battery charging management system (hereinafter referred to as management system 10). This management system 10 includes a memory 20 and a processor 30. Computer-readable instructions are stored on the memory 20. When the computer-readable instructions are executed by the processor 30, the above battery charging management method is implemented.

[0080] It should be noted that the above-mentioned memory 20 and processor 30 can both adopt existing circuit modules with data storage, processing, and input / output capabilities. In addition, in addition to the above-mentioned memory 20 and processor 30, of course, other modules such as data caching and data communication are usually also provided in the management system 10 to cache relevant data information and other relevant processing information involved, and to achieve connection communication with other relevant modules.

[0081] For the management system 10 of this embodiment, the corresponding battery charging management method in its specific use can refer to the relevant description in the above-mentioned embodiment.

[0082] Moreover, the management system 10 in this embodiment can intervene in the control when the charging current of the battery pack gets out of control by implementing the battery charging management method of the above-mentioned embodiment, and is conducive to arranging the priorities when multiple battery packs are out of control, charging the out-of-control groups according to the priorities, charging the out-of-control groups to the constant voltage charging stage, sorting the out-of-control groups according to the second sorting condition, and charging the out-of-control groups to the floating charge state. By adopting the step-down charging method, the risk of out-of-control charging current can be eliminated, which is beneficial to improving the safety of battery pack charging.

[0083] The above are only some embodiments of the present invention and are not intended to limit the present invention. The technical features or structures in the foregoing different embodiments can be arbitrarily combined according to needs to form other specific technical solutions. For those skilled in the art, various changes and modifications can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A battery charging management method for charging management of a battery bank in a DC system, characterized in that The management method includes: Obtaining the real-time charging current of each battery pack and determining whether the real-time charging current of each battery pack is out of control; Recording the battery packs with out-of-control charging current as out-of-control groups; Sorting the out-of-control groups according to the first sorting condition to obtain the first sorting result; Performing the first step-down charging on the out-of-control groups according to the first sorting result until each out-of-control group enters the constant-voltage charging stage; When each out-of-control group enters the constant-voltage charging stage, sorting the out-of-control groups according to the second sorting condition to obtain the second sorting result; Performing the second step-down charging on the out-of-control groups according to the second sorting result until each out-of-control group enters the floating-charge charging stage.

2. The battery charging management method according to claim 1, characterized in that The obtaining the charging current of each battery pack and determining whether the charging current of each battery pack is out of control includes: Obtaining the real-time charging current of each battery pack and comparing the real-time charging current of each battery pack with a first current threshold; When the real-time charging current is greater than the first current threshold and less than the second current threshold, issuing a warning of too high charging current; When the real-time charging current is greater than the second current threshold, determining that the charging current of the battery pack is out of control.

3. The battery charging management method according to claim 2, wherein The first current threshold is the I10 current value of each battery pack; and / or, The second current threshold is the n*I10 current value of each battery pack, where 1 < n < 2.

4. The battery charging management method according to claim 1, wherein: The first sorting condition includes comparing the group voltages of each out-of-control group and sorting each out-of-control group in ascending order according to the group voltage.

5. The battery charging management method according to claim 4, wherein: When the group voltages are equal, sorting according to the I10 current value of each out-of-control group and sorting each out-of-control group in descending order according to the I10 current value of the out-of-control group.

6. The battery charging management method according to claim 5, wherein: When the group voltage and the I10 current value of the out-of-control group are both equal, when recording the battery pack with out-of-control charging as the out-of-control group, numbering each out-of-control group and sorting each out-of-control group in the order of the numbers.

7. The battery charging management method according to claim 1, wherein: The second sorting condition includes comparing the I10 current values of each out-of-control group and sorting in descending order according to the I10 current value.

8. The battery charging management method according to claim 7, wherein: When the I10 current values of the out-of-control groups are equal, when recording the battery pack with out-of-control charging as the out-of-control group, numbering each out-of-control group and sorting each out-of-control group in the order of the numbers.

9. The battery charging management method according to any one of claims 1-8, wherein: When the step-down amplitude of the first step-down charging is 0 and the real-time charging current is less than the I10 current value of each out-of-control group, the out-of-control group enters the constant voltage charging stage; and / or, When the charging current of each out-of-control group is u * I10 current value and 0 < u < 1, the out-of-control group enters the floating charge stage.

10. A battery charging management system, characterized in that: It includes a memory and a processor. Computer-readable instructions are stored on the memory. When the computer-readable instructions are executed by the processor, the battery charging management method described in any one of claims 1-9 is implemented.

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