CN115498739B

CN115498739B - Energy storage system and control method thereof

Info

Publication number: CN115498739B
Application number: CN202211439512.9A
Authority: CN
Inventors: 王萌; 王斌; 封森
Original assignee: Guangdong Cairi Energy Technology Co ltd
Current assignee: Guangdong Cairi Energy Technology Co ltd
Priority date: 2022-11-17
Filing date: 2022-11-17
Publication date: 2023-06-30
Anticipated expiration: 2042-11-17
Also published as: CN115498739A

Abstract

The invention provides an energy storage system and a control method thereof, relating to the technical field of battery energy storage, wherein in the energy storage system, each BMU comprises a request chip selection line, an auxiliary sampling output line and an auxiliary sampling input line which are connected to a SWITCH controller, the BMU comprises a first BMU, and the BMU can send a chip selection signal to the SWITCH controller through the request chip selection line after monitoring an abnormal signal; the SWITCH controller receives the chip selection signal and appoints a second BMU from other BMUs except the first BMU according to a preset appointing rule so as to facilitate auxiliary sampling of the energy storage battery connected with the first BMU through the second BMU, further realize a redundant control mode of the BMU, not only realize hardware resource sharing among the BMUs, but also help to improve the service efficiency and service life of the energy storage system.

Description

Energy storage system and control method thereof

Technical Field

The invention relates to the technical field of battery energy storage, in particular to an energy storage system and a control method thereof.

Background

The existing energy storage system in the market mostly adopts a BMU (Battery Management Unit ) controller to manage the battery pack, but the BMU is generally in one-to-one correspondence with the battery pack, once damaged, the battery pack fails and cannot be used, the BMU needs to be replaced, and whether the data collected by the BMU are correct or not is difficult to judge, so that the service efficiency and service life of the energy storage system are seriously affected.

In view of the above technical problems, no reliable solution exists at present.

Disclosure of Invention

Accordingly, an objective of the present invention is to provide an energy storage system and a control method thereof, so as to alleviate the above-mentioned technical problems.

In a first aspect, an embodiment of the present invention provides an energy storage system, including: the system comprises a SWITCH controller, a plurality of Battery Management Units (BMU) and energy storage batteries connected with each BMU, wherein the BMU is used for sampling data of the connected energy storage batteries; wherein each of the BMUs includes a request chip select line, an auxiliary sampling output line, and an auxiliary sampling input line connected to the SWITCH controller; the BMU comprises a first BMU, wherein the first BMU is one of a plurality of BMUs, and abnormal signals are monitored by the BMU; the first BMU is used for sending a chip selection signal to the SWITCH controller through the request chip selection line after monitoring the abnormal signal; the SWITCH controller is used for receiving the chip selection signal and appointing a second BMU from the BMUs except the first BMU according to a preset appointing rule; and the second BMU is used for carrying out auxiliary sampling on the energy storage battery connected with the first BMU.

With reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where the SWITCH controller includes an MCU and a SWITCH matrix; the MCU is used for receiving the chip selection signal, appointing a second BMU from the BMUs except the first BMU according to a preset appointing rule, and controlling the on-off state of each switch in the switch matrix; the switch matrix comprises a plurality of switches, and the switches are arranged on connection paths of the request sheet line selection, the auxiliary sampling output line and the auxiliary sampling input line.

With reference to the first possible implementation manner of the first aspect, the embodiment of the present invention provides a second possible implementation manner of the first aspect, where the BMU is connected to the energy storage battery through a sampling line, and is configured to perform data sampling; the MCU is provided with a corresponding input sampling channel and output sampling channel; the sampling lines of a plurality of the BMUs are each connected to the input sampling channel; the switch matrix is arranged between the input sampling channel and the output sampling channel and is used for switching auxiliary sampling among a plurality of BMUs.

With reference to the first possible implementation manner of the first aspect, the embodiment of the present invention provides a third possible implementation manner of the first aspect, where the BMU is connected to the energy storage battery through a sampling line, and is configured to perform data sampling; the MCU is provided with a plurality of input sampling channels and a plurality of output sampling channels; each BMU corresponds to one input sampling channel and one output sampling channel, and a sampling line of the BMU is connected to the corresponding input sampling channel; the switch matrix is arranged between the input sampling channels and the output sampling channels and is used for switching auxiliary sampling among the BMUs.

With reference to the first possible implementation manner of the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, where the chip select signal includes a faulty chip select signal; the first BMU is used for sending a fault chip selection signal to the SWITCH controller through the request chip selection line after monitoring an abnormal signal of the fault type; wherein the fault types include: the BMU is damaged or the BMU is powered down; and the BMU continuously detects that the sampling data deviate from a normal value, and judges that the BMU has detection problems according to a sampling check mode of the BMU.

With reference to the fourth possible implementation manner of the first aspect, the embodiment of the present invention provides a fifth possible implementation manner of the first aspect, wherein the step of designating, by the SWITCH controller, a second BMU from the BMUs other than the first BMU according to a preset designating rule includes: the SWITCH controller designates a second BMU from among the other BMUs except the first BMU according to a designation rule that a physical location is most recently prioritized.

With reference to the fifth possible implementation manner of the first aspect, the embodiment of the present invention provides a sixth possible implementation manner of the first aspect, wherein after the SWITCH controller designates the second BMU, the SWITCH controller is further configured to: sending an auxiliary sampling signal to the second BMU through the auxiliary chip selection line, so that the second BMU is prepared for auxiliary sampling in a program; and controlling the switch matrix to connect the auxiliary sampling output line of the first BMU with the auxiliary sampling input line of the second BMU so that the second BMU performs auxiliary sampling on the energy storage battery connected with the first BMU.

With reference to the fourth possible implementation manner of the first aspect, an embodiment of the present invention provides a seventh possible implementation manner of the first aspect, where the chip selection signal further includes a check chip selection signal; the first BMU is used for sending the check chip selection signal to the SWITCH controller through the request chip selection line when the fact that the sampled data continuously deviate from a normal value within a preset time is monitored, so as to inform the SWITCH controller that the first BMU needs to perform sampling check; the SWITCH controller is also used for receiving the check chip selection signal, and appointing the second BMU from the BMUs except the first BMU according to an appointing rule that the physical position is most close to the nearest priority to perform auxiliary sampling on the energy storage battery connected with the first BMU; and feeding back the sampling data generated by the auxiliary sampling to the first BMU, and triggering the first BMU to enter the sampling check mode; after the first BMU enters the sample verification mode, the first BMU is further configured to: comparing the sampling data from the second BMU with the sampling data generated by the self sampling check to judge whether sampling faults occur; if yes, a fault sampling mode is entered, and the fault chip selection signal is sent to the SWITCH controller; if not, the sampling check mode is exited, an energy storage battery abnormal signal is generated, and the energy storage battery abnormal signal is sent to the upper control equipment.

With reference to the seventh possible implementation manner of the first aspect, the embodiment of the present invention provides an eighth possible implementation manner of the first aspect, where the step of designating, by the SWITCH controller, the second BMU to perform auxiliary sampling on the energy storage battery connected to the first BMU includes: the SWITCH controller sends a check sampling signal to the second BMU through the auxiliary chip selection line, so that the second BMU is prepared for check sampling in a program; and controlling the switch matrix to connect the auxiliary sampling output line of the first BMU with the auxiliary sampling input line of the second BMU, so that the first BMU and the second BMU can check and sample the energy storage battery connected with the first BMU at the same time.

In a second aspect, an embodiment of the present invention further provides a method for controlling an energy storage system, where the method is applied to the energy storage system in the first aspect; the energy storage system includes: the system comprises a SWITCH controller, a plurality of BMUs and energy storage batteries connected with each BMU, wherein the BMU is used for sampling data of the connected energy storage batteries; the BMU comprises a first BMU, wherein the first BMU is one of a plurality of BMUs, and abnormal signals are monitored by the BMU; the method comprises the following steps: after the first BMU monitors an abnormal signal, a chip selection signal is sent to the SWITCH controller through a request chip selection line; the SWITCH controller receives the chip selection signal and designates a second BMU from the BMUs except the first BMU according to a preset designating rule; the second BMU performs auxiliary sampling on the energy storage battery connected with the first BMU.

The embodiment of the invention has the following beneficial effects:

in the energy storage system, each BMU comprises a request sheet line selection, an auxiliary sampling output line and an auxiliary sampling input line which are connected to a SWITCH controller; the BMU comprises a first BMU, wherein the first BMU is a BMU with abnormal signals detected in a plurality of BMUs, and can send chip selection signals to the SWITCH controller through a request chip selection line after the abnormal signals are detected; the SWITCH controller receives the chip selection signal and appoints a second BMU from other BMUs except the first BMU according to a preset appointing rule so as to facilitate auxiliary sampling of the energy storage battery connected with the first BMU through the second BMU, further realize a redundant control mode of the BMU, not only realize hardware resource sharing among the BMUs, but also help to improve the service efficiency and service life of the energy storage system.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are some embodiments of the invention and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of an energy storage system according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a SWITCH controller according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of another SWITCH controller according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a BMU according to an embodiment of the present invention;

FIG. 5 is a flowchart of a control method of an energy storage system according to an embodiment of the present invention;

FIG. 6 is a flowchart of another method for controlling an energy storage system according to an embodiment of the present invention;

fig. 7 is a flowchart of another control method of an energy storage system according to an embodiment of the present invention.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

At present, a BMU controller used in an energy storage system, hereinafter referred to as BMU, is generally in a one-to-one correspondence with a battery pack, and once damaged, the BMU controller means that the battery pack fails and cannot be used, a new BMU needs to be replaced, whether the BMU acquired data is correct or not is difficult to determine, a more reliable redundancy mode is not provided, and if an additional sampling chip is added independently, the cost of use is also greatly increased.

Based on the above, the energy storage system and the control method thereof provided by the embodiment of the invention can effectively alleviate the technical problems.

For the sake of understanding the present embodiment, a detailed description will be given of an energy storage system disclosed in the embodiment of the present invention.

In one possible implementation, an embodiment of the present invention provides an energy storage system, including: the system comprises a SWITCH controller, a plurality of battery management units BMU and energy storage batteries connected with each BMU, wherein the BMU is used for sampling data of the connected energy storage batteries.

For ease of understanding, fig. 1 shows a schematic diagram of an energy storage system, and fig. 1 shows a SWITCH controller 10, a plurality of BMUs 20, and an energy storage battery 30 to which each BMU20 is connected.

Specifically, as shown in fig. 1, in an embodiment of the present invention, each BMU includes a request chip select line, an auxiliary sampling output line, and an auxiliary sampling input line connected to the SWITCH controller.

The BMU comprises a first BMU, wherein the first BMU is a BMU with abnormal signals monitored in a plurality of BMUs;

the first BMU is used for sending a chip selection signal to the SWITCH controller through a request chip selection line after monitoring the abnormal signal;

the SWITCH controller is used for receiving the chip selection signal and appointing a second BMU from other BMUs except the first BMU according to a preset appointed rule; and the second BMU is used for carrying out auxiliary sampling on the energy storage battery connected with the first BMU.

According to the energy storage system provided by the embodiment of the invention, each BMU comprises a request sheet line selection, an auxiliary sampling output line and an auxiliary sampling input line which are connected to a SWITCH controller; the BMU comprises a first BMU, wherein the first BMU is a BMU with abnormal signals detected in a plurality of BMUs, and can send chip selection signals to the SWITCH controller through a request chip selection line after the abnormal signals are detected; the SWITCH controller receives the chip selection signal and appoints a second BMU from other BMUs except the first BMU according to a preset appointing rule so as to facilitate auxiliary sampling of the energy storage battery connected with the first BMU through the second BMU, further realize a redundant control mode of the BMU, not only realize hardware resource sharing among the BMUs, but also help to improve the service efficiency and service life of the energy storage system.

In practical use, the SWITCH controller in the embodiment of the present invention is also referred to as a redundant co-controller, and is generally used as a cluster-level controller in a battery cluster to implement cluster-level management of the battery cluster, and interaction between the SWITCH controller and the BMU is generally performed based on a bus, such as a CAN bus, where each battery cluster includes a plurality of energy storage batteries, and the plurality of energy storage batteries may be connected in series or in parallel, and in particular, based on the actual use situation, the embodiment of the present invention is not limited in this regard.

Further, the SWITCH controller generally includes an MCU and a SWITCH matrix; the MCU is used for receiving the chip selection signals, appointing a second BMU from other BMUs except the first BMU according to a preset appointing rule, and controlling the on-off state of each switch in the switch matrix;

the SWITCH matrix comprises a plurality of switches, and each SWITCH is arranged on the connecting passage of the request sheet line selection, the auxiliary sampling output line and the auxiliary sampling input line and is used for switching the connection conditions of the request sheet line selection, the auxiliary sampling output line and the auxiliary sampling input line between each BMU and the SWITCH controller under the control of the MCU.

In practical use, the SWITCH controller of the embodiment of the present invention generally adopts a multichannel chip scheme, so as to save the IO resources of the MCU.

Further, the BMU is connected with the energy storage battery through a sampling line and is used for sampling data; the MCU is provided with a corresponding input sampling channel and output sampling channel; the input sampling channel is used for receiving data of the energy storage battery collected by the BMU, such as battery temperature, battery residual capacity, working voltage, working current and working power of the battery, attribute parameters of the energy storage battery, and the like, and the output sampling channel is used for transmitting the data of the energy storage battery to another auxiliary BMU in an auxiliary sampling stage.

Based on the input sampling channel and the output sampling channel, sampling lines of a plurality of BMUs are connected to the input sampling channel; the switch matrix is arranged between the input sampling channel and the output sampling channel and is used for switching auxiliary sampling among a plurality of BMUs.

For easy understanding, fig. 2 shows a schematic diagram of a SWITCH controller, as shown in fig. 2, including an MCU and a SWITCH matrix 200, and an input sampling channel 201 and an output sampling channel 202 disposed on the MCU, and further, in fig. 2, a request chip selection line and an auxiliary chip selection line are further shown, which correspond to bmu_1 to bmu_n respectively.

Specifically, the number of BMUs in fig. 2 is illustrated by taking N as an example, and the number of specific BMUs may be set according to actual use conditions, which is not limited in the embodiment of the present invention.

Based on the SWITCH controller shown in fig. 2, the sampling lines of all BMUs are connected together in accordance with the corresponding channels, i.e., the sampling lines are connected to the input sampling channels, e.g., sampling line CELL1 of bmu_1 and sampling line CELL1 of bmu_2 are connected to the CELL1 channel of the corresponding input sampling channel on the SWITCH controller. For example, the sampling line CELL1 of the bmu_1 collects data of the first energy storage battery connected to the bmu_1, the sampling line CELL1 of the bmu_2 collects data of the first energy storage battery connected to the bmu_2, and all the sampling lines CELL1 of the BMU are screwed together and transmitted to the SWITCH controller through the input sampling channel; the sampling line CELL2 of the BMU_1 collects data of a second energy storage battery connected with the BMU_1, the sampling line CELL2 of the BMU_2 collects data of the second energy storage battery connected with the BMU_2, all the sampling lines CELL2 of the BMU are screwed together and transmitted to the SWITCH controller through an input sampling channel, and similarly, the data of the Nth energy storage battery are collected through CELN sampling lines.

And then a scan output part, wherein the part needs auxiliary sampling of BMU2 from a SWITCH controller, for example, the BMU1, at the moment, the SWITCH controller is communicated with CELL1 of the BMU1 and CELL1 of the BMU2 through a SWITCH matrix, and the corresponding CELL2 is connected in the next round, so that the BMU2 is communicated to an energy storage battery of the corresponding BMU1 through the SWITCH matrix. Therefore, the SWITCH controller shown in fig. 2 is equivalent to a relay device, and implements auxiliary sampling of the energy storage battery. And, the SWITCH controller shown in fig. 2 can greatly reduce hardware resources on the SWITCH controller.

Further, in addition to the SWITCH controller shown in fig. 2, fig. 3 also shows a schematic diagram of another SWITCH controller, in which the BMU is also connected to the energy storage battery through a sampling line for data sampling; in the SWITCH controller shown in fig. 3, the MCU is provided with a plurality of input sampling channels 201 and a plurality of output sampling channels 202; each BMU corresponds to one input sampling channel and one output sampling channel, and a sampling line of the BMU is connected to the corresponding input sampling channel; that is, the BMU's sampling line is connected to the input sampling channel for which the SWITCH controller is assigned.

The switch matrix 200 is disposed between the plurality of input sampling channels and the plurality of output sampling channels for switching the auxiliary sampling between the plurality of BMUs.

Specifically, as shown in fig. 3, N BMUs are also illustrated as an example, and the requested slice selection line and the auxiliary slice selection line are also shown in fig. 3.

Based on fig. 3, each BMU corresponds to an input sampling channel, a sampling line CELL1 of the bmu_1 is used for collecting data of a first energy storage battery connected with the bmu_1, after the collection, the sampling line CELL2 of the bmu_1 is used for collecting data of a second energy storage battery connected with the bmu_1, after the collection, the sampling line CELL2 is sent to the SWITCH controller through a CELL2 channel, and so on, all data of the energy storage batteries of the bmu_1 are connected to the SWITCH controller through corresponding CELL channels, and the SWITCH controller is provided with a special input sampling channel for receiving the collected data of the energy storage battery of the bmu_1. Bmu_2 is similarly followed until bmu_n. Therefore, in fig. 3, the CELL channels of each BMU are individually connected to the SWITCH controller, and the auxiliary input and the auxiliary output are connected in a one-to-one correspondence through the SWITCH matrix in the SWITCH controller, so that in the connection manner shown in fig. 3, each BMU can be directly connected to the SWITCH controller in a one-to-one correspondence manner, no interference of other BMUs is generated, and accuracy of data utilization is improved.

Further, fig. 4 also shows a schematic diagram of a connection of a BMU, including a BMU20 and a plurality of energy storage batteries 30 connected to the BMU20, where the plurality of energy storage batteries are replaced by a box in fig. 4, and the number of energy storage batteries is assumed to be N, so there are N sampling line channels, i.e. CELL 1-CELLN, where, in fig. 4, each CELL channel corresponds to one energy storage battery. The schematic connection diagram of the BMU shown in fig. 4 can implement the connection manner of the BMU and the SWITCH controller in fig. 2 and 3. Wherein the auxiliary sampling output line and auxiliary sampling input line of the BMU are shown in fig. 4; the auxiliary sampling output line and the auxiliary sampling input line are also sampling channels corresponding to each energy storage battery, the auxiliary sampling output line is mainly used for outputting the auxiliary sampling line to other BMUs when the BMU samples the energy storage battery connected with the auxiliary sampling output line and the auxiliary sampling input line are required to perform auxiliary sampling, for example, the second BMU is used for performing auxiliary sampling on the energy storage battery, and the auxiliary sampling input line is abutted with the sampling line of the energy storage battery of the other BMU when the BMU performs auxiliary sampling on the energy storage battery of the other BMU so as to perform auxiliary sampling, wherein the auxiliary sampling output line and the auxiliary sampling input line are switched through the switch matrix 200.

The AFE (analog front end) in fig. 4 is used for collecting data of the energy storage battery, when the BMU itself works normally, it collects data of the energy storage battery connected to the BMU, and when the BMU performs auxiliary sampling to sample other energy storage batteries, it can collect data of the energy storage battery connected to other BMU, for example, it can sample alternately between the BMU itself and the energy storage battery connected to other BMU, and a specific sampling manner of the AFE can be set according to actual use conditions, which is not limited in this embodiment of the present invention.

Further, in order to implement auxiliary sampling of the energy storage system in the embodiment of the present invention, the chip select signal in the embodiment of the present invention includes a fault chip select signal; the first BMU is used for sending a fault chip selection signal to the SWITCH controller through a request chip selection line after monitoring an abnormal signal of the fault type; wherein, the fault type includes:

BMU damage, or BMU power down;

the BMU continuously detects that the sampling data deviate from the normal value, and the BMU is judged to have detection problems through a sampling check mode of the BMU.

In actual use, if the first BMU monitors any abnormal signal, the first BMU sends a chip selection signal to the SWITCH controller through a request chip selection line, so that the SWITCH controller can designate the second BMU from other BMUs except the first BMU according to a preset designated rule.

In particular, when the requested chip select line of the embodiment of the present invention is controlled by the corresponding BMU, the BMU sends an abnormal signal to the SWITCH controller by controlling the level on the requested chip select line. For example, if the BMU is damaged or the BMU is powered down, a fault chip selection signal can be sent to the SWITCH controller through a request chip selection line, and if the BMU continuously detects that the sampling data deviates from a normal value and the BMU is judged to have detection problems through a sampling check mode of the BMU, a check chip selection signal can be sent to the SWITCH controller through the request chip selection line.

Therefore, the BMU sends a fault/check chip select signal to the SWITCH controller by controlling the level on the request chip select line to indicate whether the BMU needs to enter a fault auxiliary sampling mode or a check sampling mode; since the requested chip select line is one, the failed chip select signal and the check chip select signal need to be distinguished by the number of high and low levels and time set in advance. For example, the fault chip select signal is effective to be a continuous low level, and the check chip select signal is effective to be a high-low level alternating signal for a period of time, the SWITCH controller can identify and distinguish the fault chip select signal and the check chip select signal, and a specific signal setting mode can be set according to actual use conditions, which is not limited by the embodiment of the invention.

Further, when designating the second BMU, the SWITCH controller typically designates the second BMU from other BMUs than the first BMU according to a designation rule that the physical location is most closely prioritized.

And, after the SWITCH controller designates the second BMU, the SWITCH controller is further configured to: sending an auxiliary sampling signal to the second BMU through an auxiliary chip selection line, so that the second BMU is prepared for auxiliary sampling in a program; and controlling the switch matrix to connect the auxiliary sampling output line of the first BMU with the auxiliary sampling input line of the second BMU so that the second BMU performs auxiliary sampling on the energy storage battery connected with the first BMU.

In practical use, considering that interaction is performed between the SWITCH controller and the BMU based on a bus, such as a CAN bus, etc., when the BMU fails, and the BMU still has a communication function, an abnormal signal CAN be sent to the SWITCH controller through a bus communication mode, the SWITCH controller CAN also designate a second BMU to perform auxiliary sampling, and if the BMU is powered down or the BMU is damaged and cannot perform bus communication, the abnormal signal CAN be sent to the SWITCH controller through the fault chip selection signal, so that the SWITCH controller CAN help to ensure that the SWITCH controller CAN timely learn about the fault of the BMU, so that the second BMU CAN be designated to perform auxiliary sampling in time, and the stability of the energy storage system is ensured.

Further, the chip select signal further includes a check chip select signal; based on the fault type, the first BMU is configured to send a check chip selection signal to the SWITCH controller by requesting a chip selection line when it is detected that the sampled data continuously deviates from a normal value for a preset time, so as to notify the SWITCH controller that the first BMU needs to perform sampling check.

The SWITCH controller is also used for receiving the check chip selection signal and appointing a second BMU from other BMUs except the first BMU according to an appointing rule that the physical position is nearest to the nearest priority so as to conduct auxiliary sampling on the energy storage battery connected with the first BMU; and feeding back the sampling data generated by the auxiliary sampling to the first BMU, and triggering the first BMU to enter a sampling check mode.

In practical use, the auxiliary line selection is usually controlled by a SWITCH controller, and the SWITCH controller specifies the BMU corresponding to the auxiliary line selection to perform auxiliary sampling processing or check sampling processing by controlling the level on a certain auxiliary line selection.

Further, for the auxiliary sampling output lines, each auxiliary sampling output line is led out by a signal sampling sensor of each BMU and is connected to a SWITCH matrix inside the SWITCH controller; each auxiliary sampling input line is led out from a SWITCH matrix in the SWITCH controller and is connected to the controller of each BMU; wherein the auxiliary sampling output line internally comprises a plurality of sub-sampling output lines, the number of the sub-sampling output lines is the same as that of the signal sampling sensor in the single BMU, and the auxiliary sampling input line internally comprises a plurality of sub-sampling input lines with the same number; for example, in practical application, the signal sampling sensor inside a single BMU includes a voltage sensor, a current sensor, and a temperature sensor, and then the number of sub-sampling output lines and sub-sampling input lines is 3, so as to realize collection and transmission of each signal.

Further, based on the request sheet line selection, the auxiliary sampling output line and the auxiliary sampling input line, when the SWITCH controller designates the second BMU to perform auxiliary sampling on the energy storage battery connected with the first BMU, the SWITCH controller can send a check sampling signal to the second BMU through the auxiliary sheet line selection, so that the second BMU is prepared for check sampling in a program; and the control switch matrix connects the auxiliary sampling output line of the first BMU with the auxiliary sampling input line of the second BMU, so that the first BMU and the second BMU can check and sample the energy storage battery connected with the first BMU at the same time, and the BMU is usually connected with the connected energy storage battery through the sampling line to collect related data of the energy storage battery.

Further, for the case that the chip select signal includes a check chip select signal, after the first BMU enters the sampling check mode, the first BMU is further configured to compare the sampling data from the second BMU with the sampling data generated by the self sampling check, and determine whether a sampling failure occurs; for example, after the first BMU detects that the sampled data continuously deviates from a preset normal value for a set period of time, it may determine that a fault is adopted, and at this time, may enter a fault sampling mode and send a fault chip select signal to the SWITCH controller; if the first BMU detects that the sampled data is kept at a normal value for a set period of time, the energy storage battery is possibly abnormal at the moment, so that the sampling check mode can be exited, an energy storage battery abnormal signal is generated, and the energy storage battery abnormal signal is sent to the upper control equipment.

In order to facilitate understanding, the embodiment of the invention further provides a control method of the energy storage system based on the energy storage system shown in fig. 1, which is applied to the energy storage system shown in fig. 1; specifically, the energy storage system includes: the system comprises a SWITCH controller, a plurality of BMUs and an energy storage battery connected with each BMU, wherein the BMU is used for sampling data of the connected energy storage battery, and the specific structure of the BMU is shown in figure 1. The plurality of BMUs comprise a first BMU, wherein the first BMU is the BMU in the plurality of BMUs, and abnormal signals are monitored by the first BMU; a flowchart of a method of controlling an energy storage system as shown in fig. 5, the method comprising the steps of:

Step S202, after the first BMU monitors the abnormal signal, a chip selection signal is sent to the SWITCH controller through a request chip selection line;

step S204, the SWITCH controller receives the chip selection signal and designates a second BMU from other BMUs except the first BMU according to a preset designated rule;

in step S206, the second BMU performs auxiliary sampling on the energy storage battery connected to the first BMU.

Specifically, as can be seen from the foregoing, the chip select signal in the embodiment of the present invention includes a fault chip select signal and a check chip select signal, and the control modes of the corresponding energy storage system also include a fault auxiliary sampling mode and a sampling check mode, so that, for convenience of understanding, the control methods of the fault auxiliary sampling mode and the sampling check mode are respectively described below, specifically, fig. 6 shows a flowchart of another control method of the energy storage system, on the basis of fig. 5, describes a control procedure of the fault auxiliary sampling mode, fig. 7 also shows a flowchart of another control method of the energy storage system, and describes a control procedure of the sampling check mode.

In the control method shown in fig. 6, it is assumed that when a certain BMU (first BMU) fails, another BMU (second BMU) is designated by the SWITCH controller to complete the auxiliary sampling. As shown in fig. 6, the control process of the fault-assisted sampling mode includes the steps of:

Step S302, after the first BMU fails, the first BMU sends a failure chip selection signal to the MCU of the SWITCH controller through a request chip selection line, so that the MCU of the SWITCH controller knows the failure of the first BMU;

step S304, the MCU of the SWITCH controller sends an auxiliary sampling signal to the second BMU through an auxiliary chip selection line, so that the second BMU is prepared for auxiliary sampling in a program;

step S306, the MCU of the SWITCH controller controls the SWITCH matrix to connect the auxiliary sampling output line of the first BMU with the auxiliary sampling input line of the second BMU;

in step S308, the second BMU starts to perform auxiliary sampling on the data of the energy storage battery in the first BMU.

In the control mode of the fault auxiliary sampling mode, the fault types comprise the following types:

(1) BMU damage, or BMU power down;

at this time, the BMU cannot complete signal sampling, and a fault chip selection signal of the BMU request chip selection line is enabled to be effective; for example, the fault chip select signal is valid at a low level, when the BMU is normal, the BMU sets a port of the connection request chip select line to a high level, and when the BMU is damaged or power is lost, the port of the connection request chip select line returns to a default low level, so that the BMU becomes valid; in addition, the fault chip select signal may be enabled by the inverter circuit, and a specific enabling manner may be set according to an actual use situation, which is not limited in the embodiment of the present invention.

(2) The BMU continuously detects that the sampling data deviate from a normal value, and judges that the BMU has a detection problem through a sampling check mode of the BMU, at the moment, the BMU actively sets a fault chip selection signal to be effective, and enters a fault auxiliary sampling mode.

In practical use, since the longer the sampling line is, the greater the interference to the sampling signal is, in step S304, the BMU closest to the first BMU in physical position is preferably used as the second BMU for performing auxiliary sampling, so as to improve accuracy of the sampling signal, and in addition, the signal line may be a differential signal transmission line with strong interference resistance, which may be specifically set according to the actual use situation, which is not limited in the embodiment of the present invention.

Further, fig. 7 shows a control procedure of the sample collation mode in which, assuming that when the first BMU detects that the sample data is continuously deviated from the normal value for a set period of time, the second BMU is designated by the SWITCH controller to sample, and the sample data is fed back to the first BMU in real time through the CAN bus, and the first BMU collates and compares with the self-sample data.

As shown in fig. 7, the method specifically comprises the following steps:

step S402, when the first BMU detects that the sampling data continuously deviates from a normal value within a set time, the first BMU sends a check chip selection signal to the MCU of the SWITCH controller through a request chip selection line, so that the MCU of the SWITCH controller knows that the first BMU needs to perform sampling check;

Step S404, the MCU of the SWITCH controller sends a check sampling signal to the second BMU through the auxiliary chip selection line, so that the second BMU is prepared for check sampling in a program;

step S406, the MCU of the SWITCH controller controls the SWITCH matrix to connect the auxiliary sampling output line of the first BMU with the auxiliary sampling input line of the second BMU;

step S408, the first BMU and the second BMU check and sample the data of the energy storage battery in the first BMU at the same time;

step S410, the second BMU sends the sampled data implementation back to the first BMU through the CAN bus;

step S412, the first BMU compares the data from the second BMU with the self data to judge whether the self has sampling fault;

step S414, if yes, entering a fault sampling mode;

and step S416, if not, exiting the sampling check mode, and alarming to the upper stage to indicate that the corresponding energy storage battery is abnormal.

Through the control method of the energy storage system, hardware resource sharing among BMUs in the same cluster can be realized, meanwhile, the accuracy of current sampling information can be approved by comparing subsampled information of other equipment under the condition of no daily faults, and the service efficiency and the service life of the energy storage system are effectively improved.

The control method of the energy storage system provided by the embodiment of the invention has the same technical characteristics as the energy storage system provided by the embodiment, so that the same technical problems can be solved, and the same technical effects can be achieved.

The energy storage system and the computer program product of the control method thereof provided by the embodiment of the invention comprise a computer readable storage medium storing a program code, and the instructions included in the program code can be used for executing the method described in the foregoing method embodiment, and specific implementation can be referred to the method embodiment and will not be repeated herein.

In addition, in the description of embodiments of the present invention, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood by those skilled in the art in specific cases.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Finally, it should be noted that: the above examples are only specific embodiments of the present invention for illustrating the technical solution of the present invention, but not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the foregoing examples, it will be understood by those skilled in the art that the present invention is not limited thereto: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims

1. An energy storage system, comprising: the system comprises a SWITCH controller, a plurality of Battery Management Units (BMU) and energy storage batteries connected with each BMU, wherein the BMU is used for sampling data of the connected energy storage batteries; the BMU is provided with a plurality of sampling line channels, and each sampling line channel corresponds to one energy storage battery; the SWITCH controller is a redundant cooperative controller;

wherein each of the BMUs includes a request chip select line, an auxiliary sampling output line, and an auxiliary sampling input line connected to the SWITCH controller;

the BMU comprises a first BMU, wherein the first BMU is one of a plurality of BMUs, and abnormal signals are monitored by the BMU;

the first BMU is used for sending a chip selection signal to the SWITCH controller through the request chip selection line after monitoring the abnormal signal;

the SWITCH controller is used for receiving the chip selection signal and appointing a second BMU from the BMUs except the first BMU according to a preset appointing rule;

the second BMU is used for carrying out auxiliary sampling on the energy storage battery connected with the first BMU;

Wherein the SWITCH controller comprises an MCU and a SWITCH matrix;

the MCU is used for receiving the chip selection signal, appointing a second BMU from the BMUs except the first BMU according to a preset appointing rule, and controlling the on-off state of each switch in the switch matrix;

the switch matrix comprises a plurality of switches, and the switches are arranged on the connection paths of the request sheet line selection, the auxiliary sampling output line and the auxiliary sampling input line;

the BMU is connected with the energy storage battery through a sampling line and is used for sampling data;

the MCU is provided with a corresponding input sampling channel and output sampling channel; the sampling lines of a plurality of the BMUs are each connected to the input sampling channel; the switch matrix is arranged between the input sampling channel and the output sampling channel and is used for switching auxiliary sampling among a plurality of BMUs;

or the MCU is provided with a plurality of input sampling channels and a plurality of output sampling channels; each BMU corresponds to one input sampling channel and one output sampling channel, and a sampling line of the BMU is connected to the corresponding input sampling channel; the switch matrix is arranged between the input sampling channels and the output sampling channels and is used for switching auxiliary sampling among the BMUs.

2. The energy storage system of claim 1, wherein the chip select signal comprises a fault chip select signal;

the first BMU is used for sending a fault chip selection signal to the SWITCH controller through the request chip selection line after monitoring an abnormal signal of the fault type;

wherein the fault types include:

the BMU is damaged or the BMU is powered down;

and the BMU continuously detects that the sampling data deviate from a normal value, and judges that the BMU has detection problems according to a sampling check mode of the BMU.

3. The energy storage system of claim 2, wherein the step of the SWITCH controller designating a second BMU from the other BMUs than the first BMU according to a preset designating rule comprises:

the SWITCH controller designates a second BMU from among the other BMUs except the first BMU according to a designation rule that a physical location is most recently prioritized.

4. The energy storage system of claim 3, wherein after the SWITCH controller designates the second BMU, the SWITCH controller is further configured to:

sending an auxiliary sampling signal to the second BMU through the auxiliary chip selection line, so that the second BMU is prepared for auxiliary sampling in a program; the method comprises the steps of,

And controlling the switch matrix to connect the auxiliary sampling output line of the first BMU with the auxiliary sampling input line of the second BMU so that the second BMU performs auxiliary sampling on the energy storage battery connected with the first BMU.

5. The energy storage system of claim 2, wherein said chip select signal further comprises a check chip select signal;

the first BMU is used for sending the check chip selection signal to the SWITCH controller through the request chip selection line when the fact that the sampled data continuously deviate from a normal value within a preset time is monitored, so as to inform the SWITCH controller that the first BMU needs to perform sampling check;

the SWITCH controller is also used for receiving the check chip selection signal, and appointing the second BMU from the BMUs except the first BMU according to an appointing rule that the physical position is most close to the nearest priority to perform auxiliary sampling on the energy storage battery connected with the first BMU; and feeding back the sampling data generated by the auxiliary sampling to the first BMU, and triggering the first BMU to enter the sampling check mode;

after the first BMU enters the sample verification mode, the first BMU is further configured to:

Comparing the sampling data from the second BMU with the sampling data generated by the self sampling check to judge whether sampling faults occur;

if yes, a fault sampling mode is entered, and the fault chip selection signal is sent to the SWITCH controller;

if not, the sampling check mode is exited, an energy storage battery abnormal signal is generated, and the energy storage battery abnormal signal is sent to the upper control equipment.

6. The energy storage system of claim 5, wherein the step of the SWITCH controller designating the second BMU to assist in sampling the energy storage battery to which the first BMU is connected comprises:

the SWITCH controller sends a check sampling signal to the second BMU through the auxiliary chip selection line, so that the second BMU is prepared for check sampling in a program; the method comprises the steps of,

and controlling the switch matrix to connect the auxiliary sampling output line of the first BMU with the auxiliary sampling input line of the second BMU so that the first BMU and the second BMU can check and sample the energy storage battery connected with the first BMU at the same time.

7. A control method of an energy storage system, characterized by being applied to the energy storage system of any one of claims 1 to 6;

The energy storage system includes: the system comprises a SWITCH controller, a plurality of BMUs and energy storage batteries connected with each BMU, wherein the BMU is used for sampling data of the connected energy storage batteries; the BMU is provided with a plurality of sampling line channels, and each sampling line channel corresponds to one energy storage battery; the SWITCH controller is a redundant cooperative controller; the BMU comprises a first BMU, wherein the first BMU is one of a plurality of BMUs, and abnormal signals are monitored by the BMU;

the method comprises the following steps:

after the first BMU monitors an abnormal signal, a chip selection signal is sent to the SWITCH controller through a request chip selection line;

the SWITCH controller receives the chip selection signal and designates a second BMU from the BMUs except the first BMU according to a preset designating rule;

the second BMU performs auxiliary sampling on the energy storage battery connected with the first BMU.