CN111146511B - BMS battery SOC correction maintenance method and system - Google Patents
BMS battery SOC correction maintenance method and system Download PDFInfo
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- CN111146511B CN111146511B CN201911217671.2A CN201911217671A CN111146511B CN 111146511 B CN111146511 B CN 111146511B CN 201911217671 A CN201911217671 A CN 201911217671A CN 111146511 B CN111146511 B CN 111146511B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a BMS battery SOC correction method and system, wherein the method comprises the following steps: the second-level server authorizes the client with the largest SOC deviation or the second-level server applies for SOC correction to the first-level server, the first-level server judges whether authorization is performed or not, a final result is sent to the second-level server, and meanwhile, the first-level server changes a signal indication state; when the second-level server judges that the SOC value of the client or the second-level server is higher or lower according to the SOC set value, starting a discharging or charging limiting condition until the battery voltage is full or reaches the set value, and releasing the discharging or charging limiting condition; and the second-level server clears the SOC correction maintenance state, and the first-level server starts to authorize the next client or the second-level server applying for SOC correction. By adopting the method and the system, the battery maintenance efficiency and accuracy can be improved, the maintenance cost can be saved, and the application value of the energy storage system can be improved.
Description
Technical Field
The invention relates to the field of battery maintenance, in particular to a BMS battery SOC correction maintenance method and system.
Background
With the continuous improvement of battery energy storage systems, the energy storage systems are gradually developed into large-scale distributed box-type cluster systems from early single independent battery pile systems, and with the continuous operation of the battery energy storage systems, after a certain number of charge and discharge cycles, the batteries of each battery pile can have different degrees of differentiation, such as the problem of inconsistent SOC, and how to enable a battery management system to carry out automatic and efficient maintenance is a problem to be solved urgently.
At present, the maintenance method generally adopted is to stop the operation of the whole distributed box type energy storage system, perform primary battery maintenance operation, seriously influence the customer income, weaken the effect of energy storage to maintain the stability of a power grid and the like, on one hand, for a large-scale distributed box type energy storage system, the battery box system is more, when a plurality of battery stacks have multiple maintenance mode requirements, the manual maintenance cost is rapidly increased, the efficiency is lower, the error probability is higher, and on the other hand, because the EMS is not a battery management system BMS, the battery characteristics and the battery differences of each battery stack are difficult to control, so that the battery maintenance of accurate positioning can not be realized by combining the characteristics of each battery stack; in the whole, the original battery maintenance method reduces the application value of the distributed box-type energy storage system to a great extent, and influences the comprehensive benefits of the distributed box-type energy storage system.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides the BMS battery SOC correction maintenance method, which can improve the battery maintenance efficiency and accuracy and improve the application value of the energy storage system.
The invention further provides a BMS battery SOC correction system.
In a first aspect, an embodiment of the present invention provides a BMS battery SOC correction maintenance method:
the method comprises the following steps:
s100: the second-level server authorizes a client with the largest SOC deviation or the second-level server applies for SOC correction to the first-level server, and the first-level server judges whether authorization is performed or not and sends a final result to the second-level server;
s200: the second-stage server judges that the SOC value of the client or the second-stage server with the largest deviation is higher than a set value according to the SOC set value, and starts a discharge limiting condition until the battery voltage is full of the set value, and releases the discharge limiting condition;
s300: the second-stage server judges that the SOC value of the client or the second-stage server is lower than a set value according to the SOC set value, and starts a charging limiting condition until the battery is discharged to the set value, and releases the charging limiting condition;
s400: after executing step S200 or S300, the second-level server clears the SOC modification maintenance status, and the first-level server starts to authorize the next client or the second-level server that is applying for SOC modification.
The BMS battery SOC correction maintenance method provided by the embodiment of the invention has at least the following beneficial effects: the battery maintenance efficiency and the accuracy are improved, and the application value of the energy storage system is improved.
According to other embodiments of the present invention, the method for maintaining the SOC correction of the BMS battery, the S100 specifically includes:
s110: the second-level server monitors the SOC of the client or the second-level server in real time and calculates the SOC deviation in real time;
s120: the second-stage server counts and sorts the calculated SOC deviation;
s130: the second-level server authorizes the client or the second-level server with the largest SOC deviation to apply for SOC correction to the first-level server;
s140: after receiving the SOC correction application, the first-stage server judges whether a condition for authorizing the client or the second-stage server to enter SOC maintenance is met;
s150: the first-level server authorizes the corresponding client or the second-level server to enter a maintenance mode;
s160: the second-level server judges whether an authorization instruction is received or not;
s170: the second-level server generates a maintenance state flag signal for the client or the second-level server to enter SOC correction and sends the maintenance state flag signal to the first-level server;
s180: and after the first-stage server receives the maintenance state flag signal, the state is indicated by a corresponding change signal.
According to other embodiments of the present invention, the method for maintaining the SOC correction of the BMS battery, the S200 specifically includes:
s210: when the second-level server judges that the SOC value of the client or the second-level server is higher than a set value, starting a discharge limiting condition;
s220: the second-stage server reduces the chargeable power according to the maximum voltage condition of the single battery;
s230: and detecting that the single battery is fully charged to the set voltage, and releasing the discharge limiting condition.
According to other embodiments of the present invention, the method for maintaining the SOC correction of the BMS battery, the S300 specifically includes:
s310: the second-level server starts a charging limiting condition when judging that the SOC value of the client or the second-level server is lower than a set value;
s320: the second-stage server reduces the power which can be put according to the minimum voltage condition of the single battery;
s330: and detecting that the single battery is discharged to the set voltage, and releasing the charging limiting condition.
According to other embodiments of the present invention, the method for maintaining the SOC correction of the BMS battery, the S400 specifically includes:
s410: the second-stage server clears the SOC correction maintenance state;
s420: the first-stage server detects that the second-stage server SOC modifies the maintenance state change and then correspondingly changes the signal indication state;
s430: the first-level server starts to authorize the client or the second-level server which applies for SOC correction next;
s440: the steps after S120 are continued.
In a second aspect, an embodiment of the present invention provides a BMS battery SOC correction system including: the system comprises a first-level server, a second-level server and clients, wherein the first-level server is an EMS (energy management system) or a BMS (management system) and the second-level server is the BMS, the clients are the BMS, the first-level server is connected with a plurality of second-level servers, and the second-level server is connected with a plurality of clients.
The BMS battery SOC correction maintenance system provided by the embodiment of the invention has at least the following beneficial effects: the system scene of application can be provided for the battery SOC correction maintenance method, the labor investment is saved, and the maintainability of the battery is improved.
Drawings
Fig. 1 is a flowchart of a method for maintaining a BMS battery SOC correction in accordance with an embodiment of the present invention;
FIG. 2 is a flowchart of step S100 in FIG. 1;
FIG. 3 is a flowchart illustrating the step S200 in FIG. 1;
FIG. 4 is a flowchart illustrating the step S300 in FIG. 1;
fig. 5 is a flowchart of step S400 in fig. 1.
Detailed Description
The conception and the technical effects produced by the present invention will be clearly and completely described in conjunction with the embodiments below to fully understand the objects, features and effects of the present invention. It is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present invention based on the embodiments of the present invention.
In the description of the embodiments of the present invention, if "several" is referred to, it means more than one, if "multiple" is referred to, it is understood that the number is not included if "greater than", "less than", "exceeding", and it is understood that the number is included if "above", "below", "within" is referred to. If reference is made to "first", "second" it is to be understood as being used for distinguishing technical features and not as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
It should be noted that, in practical applications, there may be different kinds of maintenance modes, such as battery capacity calibration maintenance, battery equalization consistency maintenance, battery internal resistance calculation requirement maintenance, battery low-current depolarization maintenance, and battery SOC correction maintenance, where in this embodiment, a maintenance requirement level is designed for a case where a single maintenance mode or multiple maintenance modes are applied simultaneously, and the following description is given of the maintenance requirement level by way of example, for example: the battery capacity calibration maintenance, the maintenance demand level H1, the battery SOC correction maintenance, the maintenance demand level H2, the battery low-current depolarization maintenance, the maintenance demand level H3, the battery balance consistency maintenance, the maintenance demand level H4, the battery internal resistance calculation demand maintenance, the maintenance demand level H5, the maintenance demand level is equal to 0, which represents that corresponding maintenance is not needed, the maintenance demand priority POM of each battery stack BMS is priority of maintenance, is abbreviated as priority of maintenance, and the calculation is carried out: the values of H1 to H5 can be configured according to a program, and the second-level server compares the POM values of the client or the second-level server, and the higher the POM value is, the higher the priority is, further, for example, the POM value with the highest priority is h2+h3=5, wherein the value of H2 is 4, and the value of H1 is 1, so that the client or the second-level server is proved to perform the SOC correction with the maintenance level H2 preferentially.
Example 1: referring to fig. 1, a flowchart of a BMS battery SOC correction method according to an embodiment of the present invention is shown. The method specifically comprises the following steps:
s100: the second-level server authorizes a client with the largest SOC deviation or the second-level server applies for SOC correction to the first-level server, and the first-level server judges whether authorization is performed or not and sends a final result to the second-level server;
specifically, the second-stage server judges that the object with the largest SOC deviation may be the BMS itself or configured as the client, and after the object with the largest SOC deviation is judged, the first-stage server authorizes the object with the largest pressure difference, and then the first-stage server sends the authorization result to the second-stage server, and the signal indication state at the first-stage server changes.
S200: the second-stage server judges that the SOC value of the client or the second-stage server with the largest deviation is higher than a set value according to the SOC set value, and starts a discharge limiting condition until the battery voltage is full of the set value, and releases the discharge limiting condition;
specifically, this step is more specific implementation of the step S100, where the second-stage server compares, according to the SOC value set by the system as a reference value, whether the SOC value of the client or the second-stage server itself is higher or lower than the reference value, and the step is for the higher case, where the second-stage server starts the discharge limiting condition, that is, the discharge is impossible at this time, and only charging is allowed until the battery voltage is full to the system set value, and the discharge limiting condition is released, that is, discharging is allowed at this time.
S300: the second-stage server judges that the SOC value of the client or the second-stage server is lower than a set value according to the SOC set value, and starts a charging limiting condition until the battery is discharged to the set value, and releases the charging limiting condition;
specifically, this step is a more specific implementation of the above step S100, where the second-level server compares, according to the SOC value set by the system, whether the SOC value of the client or the second-level server itself is higher or lower than the reference value, and this step is for the case of lower SOC value, where the second-level server starts the charging limitation condition, that is, the charging is not possible at this time, only discharging is allowed until the battery voltage is discharged to the system set value, and the charging limitation condition is released, that is, charging is allowed at this time.
S400: after executing step S200 or S300, the second-level server clears the SOC modification maintenance status, and the first-level server starts to authorize the next client or the second-level server that is applying for SOC modification.
Specifically, after executing the above step S200 or S300, it is verified that a charging or discharging process of the battery has been completed, and at this time, the second-stage server clears the SOC correction maintenance state, that is, does not need to perform SOC correction maintenance under the existing condition, and at this time, the first-stage server starts to authorize the next client or the second-stage server that is applying for SOC correction.
Embodiment 2, referring to fig. 2, shows the step S100 in fig. 1 in the embodiment of the present invention, which specifically includes the steps of:
s110: the second-level server monitors the SOC of the client or the second-level server in real time and calculates the SOC deviation in real time;
specifically, the second-stage server is configured as a BMS of the server in advance by the system, the other BMS are configured as clients, and the BMS serving as the second-stage server has the same functions of independently executing maintenance operations as a plurality of BMS serving as clients, but the BMS serving as the second-stage server has the functions of comprehensively planning, calculating and selecting one or more BMS serving as clients to apply maintenance instructions to the first-stage server, so that the second-stage server monitors the clients and simultaneously detects the second-stage server when performing real-time detection of the SOC.
S120: the second-stage server counts and sorts the calculated SOC deviation;
specifically, the statistical ordering of the SOC deviation in this step includes the comprehensive ordering of the SOC deviations of the monitoring client and the second-level server itself.
S130: the second-level server authorizes the client or the second-level server with the largest SOC deviation to apply for SOC correction to the first-level server;
specifically, as the BMS having the overall configuration function, the second-level server may be authorized to apply for SOC correction to the first-level server for the client having the largest deviation, and it can be understood through the above steps that the BMS having the largest deviation may be the client or may be the second-level server itself.
S140: after receiving the SOC correction application, the first-stage server judges whether a condition for authorizing the client or the second-stage server to enter SOC maintenance is met;
specifically, after the first-stage server receives the SOC correction application, the first-stage server judges whether the client for applying SOC correction or the second-stage server meets the preset condition according to the preset condition, if so, the next maintenance mode is entered, and if not, the circulation is continued to judge whether the preset condition is met.
S150: the first-level server authorizes the corresponding client or the second-level server to enter a maintenance mode;
specifically, in connection with step S14, when the first-level server determines that the client or the second-level server meets the authorized SOC maintenance condition, the first-level server enters a maintenance mode.
S160: the second-level server judges whether an authorization instruction is received or not;
specifically, if the second-level server determines that the authorization instruction is received, it proceeds to the next step, and if it determines that the authorization instruction is not received, steps S150 and S160 are cyclically executed.
S170: the second-level server generates a maintenance state flag signal for the client or the second-level server to enter SOC correction and sends the maintenance state flag signal to the first-level server;
s180: and after the first-stage server receives the maintenance state flag signal, the state is indicated by a corresponding change signal.
Specifically, after the first-stage server receives the maintenance state signal, the corresponding battery stack icon is switched from the green state of normal operation to the yellow state, or the image-text description of SOC correction is displayed on the first-stage server so as to inform a user that the corresponding battery stack enters the SOC correction maintenance state, or the color identification and the image-text description are applied simultaneously, so that the battery stack is more visual and easier to understand.
Example 3: fig. 3 shows a step S200 in fig. 1 in an embodiment of the present invention, which specifically includes the steps of:
s210: when the second-level server judges that the SOC value of the client or the second-level server is higher than a set value, starting a discharge limiting condition;
specifically, the discharge limiting condition here is to set the dischargeable power clear.
S220: the second-stage server reduces the chargeable power according to the maximum voltage condition of the single battery;
specifically, the second-stage server decreases the chargeable power in steps according to the maximum voltage condition of the single battery, for example: if the battery is set to a full voltage of 3.6V, the gradient decrease example is as follows:
(1) When the maximum voltage of the monomer is less than 3.5V, the maximum chargeable power is full power;
(2) When the maximum voltage of the monomer is between 3.5V and 3.55V, the maximum chargeable power is 0.5C multiplying power;
(3) When the maximum voltage of the monomer is between 3.55V and 3.6V, the maximum chargeable power is 0.2C multiplying power;
(4) Until the battery is full of 3.6V.
From the above, it can be seen that the rechargeable power is reduced stepwise according to the maximum voltage of the single battery until the battery is fully charged.
S230: and detecting that the single battery is fully charged to the set voltage, and releasing the discharge limiting condition.
Example 4: fig. 4 shows a step S300 in fig. 1 in an embodiment of the present invention, which specifically includes the steps of:
s310: the second-level server starts a charging limiting condition when judging that the SOC value of the client or the second-level server is lower than a set value;
specifically, the charging limitation condition in this step is zero clearing of the chargeable power.
S320: the second-stage server reduces the power which can be put according to the minimum voltage condition of the single battery;
specifically, the second-stage server decreases the playable power in steps according to the minimum voltage of the single unit, and if the battery is set to a vent voltage of 2.7V, the following examples of the step decreases are:
(1) When the minimum voltage of the single battery is more than 2.9V, the maximum power of the amplifying power is full power;
(2) When the minimum voltage of the single battery is between 2.8V and 2.9V, the maximum power of the power amplifier is 0.5C multiplying power;
(3) When the minimum voltage of the single battery is between 2.7V and 2.8V, the maximum power of the power amplifier is 0.2C multiplying power;
(4) Until the battery is drained to 2.7V.
S330: and detecting that the single battery is discharged to the set voltage, and releasing the charging limiting condition.
Example 5: fig. 5 shows a step S400 in fig. 1 in an embodiment of the present invention, which specifically includes the steps of:
s410: the second-stage server clears the SOC correction maintenance state;
it can be appreciated that the SOC correction maintenance status is cleared, i.e., no SOC maintenance is required by the client or the second level server.
S420: the first-stage server detects that the second-stage server SOC modifies the maintenance state change and then correspondingly changes the signal indication state;
specifically, after detecting that the second-level server SOC corrects the maintenance state change, the first-level server switches the corresponding icon from the yellow maintenance mode to the green normal operation mode.
S430: the first-level server starts to authorize the client or the second-level server which applies for SOC correction next;
s440: the steps after S120 are continued.
Embodiment 6, a bms battery SOC correction system, comprising: the system comprises a first-level server, a second-level server and clients, wherein the first-level server is an EMS (energy management system) or a BMS (management system) and the second-level server is the BMS, the clients are the BMS, the first-level server is connected with a plurality of second-level servers, and the second-level server is connected with a plurality of clients.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention. Furthermore, embodiments of the invention and features of the embodiments may be combined with each other without conflict.
Claims (6)
1. The BMS battery SOC correction maintenance method is characterized by comprising the following steps:
s100: the second-level server counts and sorts the SOC deviation of the client or the second-level server so as to authorize the client or the second-level server with the largest SOC deviation to apply for SOC correction to the first-level server, and after receiving the SOC correction application, the first-level server judges whether the condition of authorizing the client or the second-level server to enter SOC maintenance is met or not and sends a final result to the second-level server; the second-level server is a BMS, the client is a BMS, the first-level server is connected with one or more second-level servers, and the second-level server is connected with one or more clients;
s200: the second-stage server judges that the SOC value of the client or the second-stage server with the largest deviation is higher than a set value according to the SOC set value, and starts a discharge limiting condition until the battery voltage is full of the set value, and releases the discharge limiting condition;
s300: the second-stage server judges that the SOC value of the client or the second-stage server is lower than a set value according to the SOC set value, and starts a charging limiting condition until the battery is discharged to the set value, and releases the charging limiting condition;
s400: after executing step S200 or S300, the second-level server clears the SOC modification maintenance status, and the first-level server starts to authorize the next client or the second-level server that is applying for SOC modification.
2. The BMS battery SOC correction maintenance method according to claim 1, wherein the S100 specifically includes:
s110: the second-level server monitors the SOC of the client or the second-level server in real time and calculates the SOC deviation in real time;
s120: the second-stage server counts and sorts the calculated SOC deviation;
s130: the second-level server authorizes the client or the second-level server with the largest SOC deviation to apply for SOC correction to the first-level server;
s140: after receiving the SOC correction application, the first-stage server judges whether a condition for authorizing the client or the second-stage server to enter SOC maintenance is met;
s150: the first-level server authorizes the corresponding client or the second-level server to enter a maintenance mode;
s160: the second-level server judges whether an authorization instruction is received or not;
s170: the second-level server generates a maintenance state flag signal for the client or the second-level server to enter SOC correction and sends the maintenance state flag signal to the first-level server;
s180: and after the first-stage server receives the maintenance state flag signal, the state is indicated by a corresponding change signal.
3. The BMS battery SOC correction maintenance method of claim 1, wherein the S200 specifically comprises:
s210: when the second-level server judges that the SOC value of the client or the second-level server is higher than a set value, starting a discharge limiting condition;
s220: the second-stage server reduces the chargeable power according to the maximum voltage condition of the single battery;
s230: and detecting that the single battery is fully charged to the set voltage, and releasing the discharge limiting condition.
4. The BMS battery SOC correction maintenance method of claim 3, wherein the S300 specifically comprises:
s310: the second-level server starts a charging limiting condition when judging that the SOC value of the client or the second-level server is lower than a set value;
s320: the second-stage server reduces the power which can be put according to the minimum voltage condition of the single battery;
s330: and detecting that the single battery is discharged to the set voltage, and releasing the charging limiting condition.
5. The BMS battery SOC correction maintenance method of claim 3, wherein the S400 specifically comprises:
s410: the second-stage server clears the SOC correction maintenance state;
s420: the first-stage server detects that the second-stage server SOC modifies the maintenance state change and then correspondingly changes the signal indication state;
s430: the first-level server starts to authorize the client or the second-level server which applies for SOC correction next;
s440: the steps after S120 are continued.
6. A BMS battery SOC correction system applying the method of any of claims 1 to 5, comprising: the system comprises a first-level server, a second-level server and clients, wherein the first-level server is an EMS (energy management system) or a BMS (management system), the second-level server is the BMS, the clients are the BMS, the first-level server is connected with one or more second-level servers, and the second-level server is connected with one or more clients.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103344919A (en) * | 2013-06-26 | 2013-10-09 | 天津市松正电动汽车技术股份有限公司 | Method for calibrating SOC of lithium-ion battery |
| CN109375110A (en) * | 2018-09-11 | 2019-02-22 | 深圳市科陆电子科技股份有限公司 | Energy-storage system SOC self-correcting system |
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| KR101057547B1 (en) * | 2010-01-26 | 2011-08-17 | 에스비리모티브 주식회사 | Battery Management System and Its Driving Method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103344919A (en) * | 2013-06-26 | 2013-10-09 | 天津市松正电动汽车技术股份有限公司 | Method for calibrating SOC of lithium-ion battery |
| CN109375110A (en) * | 2018-09-11 | 2019-02-22 | 深圳市科陆电子科技股份有限公司 | Energy-storage system SOC self-correcting system |
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