CN111146511B - BMS battery SOC correction maintenance method and system - Google Patents

Abstract

The invention discloses a BMS battery SOC correction method and system, wherein the method includes 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, and the first The first-level server judges whether to authorize, sends the final result to the second-level server, and the first-level server changes the signal indication state; the second-level server judges that the SOC value of the client or the second-level server is too high according to the SOC setting value or low, start discharging or charging limiting conditions until the battery voltage is fully charged or discharged to the set value, release discharging or charging limiting conditions; the second-level server will clear the SOC correction maintenance status, and the first-level server will start to authorize the next The client or the second-level server that is applying for SOC amendment. By adopting the above method and system, the present invention can improve battery maintenance efficiency and accuracy, save maintenance cost, and improve the application value of the energy storage system.

Description

BMS battery SOC correction and maintenance method and system

technical field

The invention relates to the field of battery maintenance, in particular to a BMS battery SOC correction and maintenance method and system.

Background technique

With the continuous improvement of the battery energy storage system, the energy storage system has gradually developed from an early single independent battery stack system to a large-scale distributed box-type cluster system. With the continuous operation of the battery energy storage system, after a certain period of charging and discharging After the number of cycles, the batteries of each battery stack will have different degrees of differentiation, such as the problem of SOC inconsistency. How to make the battery management system perform automatic and efficient maintenance is an urgent problem to be solved.

At present, the maintenance method generally adopted is to stop the operation of the entire distributed box-type energy storage system and perform a battery maintenance operation, which will seriously affect customer income and weaken the role of energy storage in maintaining the stability of the grid. On the one hand, for large-scale distribution Box-type energy storage system, there are many battery box systems. When multiple battery stacks require multiple maintenance modes, not only the cost of manual maintenance will rise sharply, but also the efficiency will become relatively low, and the probability of error will be greater. On the one hand, since EMS is not a battery management system (BMS), it is difficult to control the battery characteristics and battery differences of each battery stack, so it cannot combine the characteristics of each battery stack to achieve precise battery maintenance; overall, the original The battery maintenance method greatly reduces the application value of the distributed box-type energy storage system and affects its comprehensive income.

Contents of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. For this reason, the present invention proposes a BMS battery SOC correction and maintenance method, which can improve battery maintenance efficiency and accuracy, and improve the application value of the energy storage system.

The invention also proposes a BMS battery SOC correction system.

In the first aspect, an embodiment of the present invention provides a BMS battery SOC correction and maintenance method:

Include the following steps:

S100: the second-level server authorizes the client with the largest SOC deviation or the second-level server to apply for SOC correction to the first-level server, and the first-level server determines whether to authorize, and sends the final result to the second-level server;

S200: When the second-level server judges that the SOC value of the client with the largest deviation or the second-level server is higher than the set value according to the SOC setting value, start the discharge restriction condition until the battery voltage is fully charged to Set the value to release the discharge restriction condition;

S300: When the second-level server judges that the SOC value of the client or the second-level server is lower than the set value according to the SOC setting value, start the charging restriction condition until the battery discharges to the set value, and release the charging limitation factor;

S400: After performing step S200 or S300, the second-level server clears the SOC correction maintenance status, and the first-level server starts to authorize the next client or the second-level server that is applying for SOC correction.

A BMS battery SOC correction and maintenance method according to an embodiment of the present invention has at least the following beneficial effects: improving battery maintenance efficiency and accuracy, and improving the application value of an energy storage system.

According to a BMS battery SOC correction and maintenance method according to other embodiments of the present invention, 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 an SOC deviation in real time;

S120: The second-level server counts and sorts the calculated SOC deviations;

S130: The second-level server authorizes the client with the largest SOC deviation or the second-level server to apply to the first-level server for SOC correction;

S140: After the first-level server receives the SOC revision application, determine whether the conditions for authorizing the client or the second-level server to enter the SOC maintenance are satisfied;

S150: The first-level server authorizes the corresponding client or the second-level server to enter a maintenance mode;

S160: The second-level server determines whether an authorization instruction is received;

S170: The second-level server generates a maintenance state signal indicating that the client or the second-level server enters SOC correction and sends it to the first-level server;

S180: After receiving the maintenance state flag signal, the first-level server changes the signal indicating state accordingly.

According to a BMS battery SOC correction and maintenance method according to other embodiments of the present invention, 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, start a discharge restriction condition;

S220: The second-level server reduces the rechargeable power according to the maximum voltage of the single battery;

S230: It is detected that the single battery is fully charged to a set voltage, and the discharge restriction condition is released.

According to a BMS battery SOC correction and maintenance method according to other embodiments of the present invention, the S300 specifically includes:

S310: When the second-level server determines that the SOC value of the client or the second-level server is lower than a set value, activate a charging restriction condition;

S320: The second-level server reduces the dischargeable power according to the minimum voltage of the single battery;

S330: It is detected that the single battery is discharged to a set voltage, and the charging restriction condition is released.

According to a BMS battery SOC correction and maintenance method according to other embodiments of the present invention, the S400 specifically includes:

S410: The second-level server clears the SOC correction and maintenance status to zero;

S420: After the first-level server detects that the SOC correction and maintenance state of the second-level server has changed, it correspondingly changes the signal indication state;

S430: The first-level server starts to authorize the next client or the second-level server that is applying for SOC revision;

S440: continue to execute the steps after S120.

In the second aspect, an embodiment of the present invention provides a BMS battery SOC correction system, including: a first-level server, a second-level server, and a client, the first-level server is EMS or BMS, and the second-level The first-level server is a BMS, the client is a BMS, the first-level server is connected to several second-level servers, and the second-level server is connected to several clients.

A BMS battery SOC correction and maintenance system according to an embodiment of the present invention has at least the following beneficial effects: it can provide an application system scene for the battery SOC correction and maintenance method, save manpower input, and improve battery maintainability.

Description of drawings

Fig. 1 is a schematic flow chart of a specific embodiment of a BMS battery SOC correction and maintenance method in an embodiment of the present invention;

Fig. 2 is a schematic flow chart of a specific embodiment of step S100 in Fig. 1;

Fig. 3 is a schematic flow chart of a specific embodiment of step S200 in Fig. 1;

Fig. 4 is a schematic flow chart of a specific embodiment of step S300 in Fig. 1;

FIG. 5 is a schematic flowchart of a specific embodiment of step S400 in FIG. 1 .

Detailed ways

The conception and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments, so as to fully understand the purpose, features and effects of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative efforts belong to The protection scope of the present invention.

In the description of the embodiments of the present invention, if it involves "several", it means more than one; if it involves "multiple", it means more than two; if it involves "greater than", "less than", "more than ", should be understood as not including the original number, if it involves "above", "below", and "within", it should be understood as including the original number. If "first" and "second" are involved, it should be understood as used to distinguish technical features, and should not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the indicated The sequence of technical features.

It should be noted that there may be different types of maintenance modes in practical applications, such as battery capacity calibration maintenance, battery balance consistency maintenance, battery internal resistance calculation demand maintenance, battery low current depolarization maintenance, battery SOC correction maintenance, etc. , in this embodiment, the maintenance demand level is designed for the application of a single maintenance mode or multiple maintenance modes at the same time. The description of the maintenance demand level is given below in the form of an example, for example: battery capacity calibration maintenance, maintenance demand level H1 , Battery SOC correction maintenance, maintenance requirement level H2, battery small current depolarization maintenance, maintenance requirement level H3, battery balance consistency maintenance, maintenance requirement level H4, battery internal resistance calculation requirement maintenance, maintenance requirement level H5, above maintenance requirements When the level value is 0, it means that no corresponding maintenance is required. The maintenance demand priority POM of each battery stack BMS is the abbreviation of priority of maintenance. Calculation: POM=H1+H2+H3+H4+H5, where H1～ The value of H5 can be configured according to the program. The second-level server compares the POM value of the client or the second-level server. The larger the POM value, the higher the priority. 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, which proves that the client or the second-level server preferentially performs SOC correction with the maintenance level of H2.

Embodiment 1: Referring to FIG. 1 , it shows a schematic flowchart of a BMS battery SOC correction method in an embodiment of the present invention. It specifically includes steps:

S100: the second-level server authorizes the client with the largest SOC deviation or the second-level server to apply for SOC correction to the first-level server, and the first-level server determines whether to authorize, and sends the final result to the second-level server;

Specifically, the second-level server judges that the object with the largest SOC deviation can be itself or a BMS configured as a client. After judging the object with the largest SOC deviation, the first-level server authorizes the object with the largest pressure difference. The primary server will send the authorization result to the secondary server, and the signal on the primary server side will change the state.

S200: When the second-level server judges that the SOC value of the client with the largest deviation or the second-level server is higher than the set value according to the SOC setting value, start the discharge restriction condition until the battery voltage is fully charged to Set the value to release the discharge restriction condition;

Specifically, this step is a more specific implementation of the above step S100. The second-level server compares whether the SOC value of the client or the second-level server itself is higher or lower than the reference value according to the SOC value set by the system. Low, this step is for the high situation, the second level server starts the discharge restriction condition, that is, it cannot discharge at this time, and only allows charging until the battery voltage is fully charged to the system setting value, and the discharge restriction condition is released, that is, Discharge is allowed at this time.

S300: When the second-level server judges that the SOC value of the client or the second-level server is lower than the set value according to the SOC setting value, start the charging restriction condition until the battery discharges to the set value, and release the charging limitation factor;

Specifically, this step is a more specific implementation of the above step S100. The second-level server compares whether the SOC value of the client or the second-level server itself is higher or lower than the reference value according to the SOC value set by the system. Low, this step is for low conditions, at this time, the second-level server starts the charging restriction condition, that is, it cannot charge at this time, and only discharge is allowed until the battery voltage discharges to the system setting value, and the charging restriction condition is released. That is to say, charging is allowed at this time.

S400: After performing step S200 or S300, the second-level server clears the SOC correction maintenance status, and the first-level server starts to authorize the next client or the second-level server that is applying for SOC correction.

Specifically, after performing the above steps S200 or S300, it is proved that a charging or discharging process of the battery has been completed, and at this time, the second-level server clears the SOC correction maintenance status, that is, no SOC correction is required under the existing conditions Maintenance, at this time, the first-level server starts to authorize the next client or the second-level server that is applying for SOC revision.

Embodiment 2, with reference to Fig. 2, has shown the S100 step in Fig. 1 in the embodiment of the present invention, and it specifically comprises steps:

S110: The second-level server monitors the SOC of the client or the second-level server in real time, and calculates an SOC deviation in real time;

Specifically, the second-level server is configured in advance by the system as the BMS of the server, and the remaining BMSs are configured as clients. The BMS as the second-level server has the same function as multiple BMSs as clients, and has the function of independently performing maintenance operations. However, the BMS as the second-level server has the functions of coordinating, calculating, and selecting one or more client BMSs to apply for maintenance instructions from the first-level server. Therefore, when the second-level server performs SOC real-time detection At the same time, it will also detect itself.

S120: The second-level server counts and sorts the calculated SOC deviations;

Specifically, the statistical sorting of SOC deviations in this step includes comprehensive sorting of the SOC deviations of the monitoring client and the second-level server itself.

S130: The second-level server authorizes the client with the largest SOC deviation or the second-level server to apply to the first-level server for SOC correction;

Specifically, as a BMS with an overall planning function, the second-level server may have the right to authorize the client with the largest deviation to apply for SOC correction to the first-level server. It can be understood through the above steps that the BMS with the largest deviation may be The client may also act as a second-level server itself.

S140: After the first-level server receives the SOC revision application, determine whether the conditions for authorizing the client or the second-level server to enter the SOC maintenance are satisfied;

Specifically, when the first-level server receives the SOC amendment application, the first-level server judges whether the client applying for SOC amendment or the second-level server meets the preset conditions according to the preset conditions, and if so, it will enter the next maintenance mode , if it is not satisfied, continue to loop 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 conjunction with step S14, when the first-level server determines that the client or the second-level server that meets the authorized SOC maintenance conditions enters the maintenance mode.

S160: The second-level server determines whether an authorization instruction is received;

Specifically, if the second-level server judges that the authorization instruction has been received, it enters the next step; if it judges that the authorization instruction is not received, it executes steps S150 and S160 in a loop.

S170: The second-level server generates a maintenance state signal indicating that the client or the second-level server enters SOC correction and sends it to the first-level server;

S180: After receiving the maintenance state flag signal, the first-level server changes the signal indicating state accordingly.

Specifically, after the first-level server receives the maintenance status signal, it switches the corresponding battery stack icon from a green mark in normal operation to a yellow mark, or displays a graphic description of the SOC revision on the first-level server to inform the user representative to respond accordingly. The battery stack has entered the SOC correction maintenance state, or the color code and graphic description are applied at the same time, which can be more intuitive and easy to understand.

Embodiment 3: Figure 3 shows the S200 step in Figure 1 in the embodiment of the present invention, which specifically includes steps:

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, start a discharge restriction condition;

Specifically, the discharge restriction condition here is setting the dischargeable power and clearing it to zero.

S220: The second-level server reduces the rechargeable power according to the maximum voltage of the single battery;

Specifically, the second-level server lowers the rechargeable power step by step according to the maximum voltage of the single battery. For example, if the battery is set to be fully charged with a voltage of 3.6V, the step-by-step reduction 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 charging power is 0.5C rate power;

(3) When the maximum voltage of the monomer is between 3.55V and 3.6V, the maximum chargeable power is 0.2C rate power;

(4) until the battery is fully charged to 3.6V.

It can be seen from the above that in this step, the rechargeable power is gradually reduced according to the maximum voltage of the single battery until the battery is fully charged.

S230: It is detected that the single battery is fully charged to a set voltage, and the discharge restriction condition is released.

Embodiment 4: Figure 4 shows the S300 step in Figure 1 in the embodiment of the present invention, which specifically includes steps:

S310: When the second-level server determines that the SOC value of the client or the second-level server is lower than a set value, activate a charging restriction condition;

Specifically, the charging limitation condition in this step is to reset the charging power to zero.

S320: The second-level server reduces the dischargeable power according to the minimum voltage of the single battery;

Specifically, the second-level server lowers the dischargeable power step by step according to the minimum voltage of the monomer. If the battery discharge voltage is set to 2.7V, an example of step reduction is as follows:

(1) When the minimum voltage of the single battery is greater than 2.9V, the maximum dischargeable power is full power;

(2) When the minimum voltage of the single battery is between 2.8V and 2.9V, the maximum discharge power is 0.5C rate power;

(3) When the minimum voltage of the single battery is between 2.7V and 2.8V, the maximum discharge power is 0.2C rate power;

(4) until the battery is discharged to 2.7V.

S330: It is detected that the single battery is discharged to a set voltage, and the charging restriction condition is released.

Embodiment 5: Figure 5 shows the S400 step in Figure 1 in the embodiment of the present invention, which specifically includes steps:

S410: The second-level server clears the SOC correction and maintenance status to zero;

It can be understood that the SOC revision maintenance state is cleared, that is, at this time, the client or the second-level server does not need to perform SOC maintenance.

S420: After the first-level server detects that the SOC correction and maintenance state of the second-level server has changed, it correspondingly changes the signal indication state;

Specifically, after the first-level server detects the change of the SOC correction maintenance status of the second-level server, it switches the corresponding icon from the yellow maintenance mode to the green normal operation mode.

S430: The first-level server starts to authorize the next client or the second-level server that is applying for SOC revision;

S440: continue to execute the steps after S120.

Embodiment 6, BMS battery SOC correction system, including: a first-level server, a second-level server, a client, the first-level server is EMS or BMS, the second-level server is BMS, and the client is In the BMS, the first-level server is connected to several second-level servers, and the second-level server is connected to several clients.

The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various modifications can be made without departing from the gist of the present invention. kind of change. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other if there is no 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.

Images