Energy storage system and control method thereof

Abstract

The invention provides an energy storage system and a control method thereof. The energy storage system comprises a cathode bus; the first auxiliary loop is connected with the cathode bus and comprises a first shunt; the first input end of the amplifier is connected with one end of the first shunt, the second input end of the amplifier is connected with the other end of the first shunt, and the amplifier is used for amplifying the first voltage of the first shunt to obtain a second voltage; a third input end of the comparator is connected with a first output end of the amplifier, a fourth input end of the comparator is connected with a power supply, and the comparator is used for outputting a high-level signal based on the fact that the second voltage is greater than a voltage threshold; and the first controller is connected with the second output end of the comparator, is connected with the first auxiliary loop, and is used for outputting a high-level signal based on the comparator and controlling the first auxiliary loop to stop working. When the auxiliary loop breaks down, the auxiliary loop can be disconnected, and therefore work of the main loop is not affected.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage systems, and in particular to an energy storage system and a control method thereof. Background Art

[0002] In the field of power or energy storage, energy storage systems have auxiliary output requirements. In general, the output power or output current of the auxiliary circuit is lower than that of the main circuit, so the protection points of the two circuits are not consistent. However, most of the current technologies are that the auxiliary circuit and the main circuit share the protection circuit of the main circuit. Figure 1 As shown, when a short circuit fault occurs in the auxiliary circuit, the AFE (Analog Front End Controller) will detect the short circuit current through the shunt, and then control the main circuit discharge power tube to shut down, thereby disconnecting the auxiliary circuit. It can be seen that when the auxiliary circuit fails, it will affect the normal operation of the main circuit. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] To this end, a first aspect of the present invention provides an energy storage system.

[0005] A second aspect of the present invention provides a control method for an energy storage system.

[0006] In view of this, according to a first aspect of the present invention, an energy storage system is proposed, comprising: a negative bus; a first auxiliary circuit, the first auxiliary circuit is connected to the negative bus, and the first auxiliary circuit comprises a first shunt; an amplifier, a first input terminal of the amplifier is connected to one end of the first shunt, and a second input terminal of the amplifier is connected to the other end of the first shunt, for amplifying a first voltage of the first shunt to obtain a second voltage; a comparator, a third input terminal of the comparator is connected to a first output terminal of the amplifier, and a fourth input terminal of the comparator is connected to a power supply, for outputting a high-level signal based on the second voltage being greater than a voltage threshold; a first controller, the first controller is connected to the second output terminal of the comparator, and the first controller is also connected to the first auxiliary circuit, for controlling the first auxiliary circuit to stop working based on the comparator outputting a high-level signal.

[0007] The energy storage system provided by the present invention mainly includes: a negative bus, a first auxiliary circuit, a shunt, an amplifier, a comparator and a first controller. The negative bus refers to the summary point of the negative connection of all batteries in the battery pack in the energy storage system, which represents the negative connection provided by the entire battery pack to the outside. The first auxiliary circuit is arranged near the negative bus and connected to the negative bus, and can assist the main circuit in outputting current. A first shunt is arranged in the first auxiliary circuit, and the first shunt can detect the current of the first auxiliary circuit, and then determine the voltage across the first shunt, and then determine the working state of the first auxiliary circuit. The first input end of the amplifier is connected to one end of the first shunt, and the second input end of the amplifier is connected to the other end of the first shunt, that is, the amplifier is connected in parallel with the first shunt. The amplifier can be a differential amplifier or a current amplifier. The amplifier can obtain the first voltage across the first shunt, and then amplify the first voltage to obtain the second voltage. The third input terminal of the comparator is connected to the first output terminal of the amplifier, and the fourth input terminal of the comparator is connected to the power supply. The comparator can compare the second voltage output by the amplifier with the voltage threshold. When the second voltage is greater than the voltage threshold, the comparator will output a high-level signal. The voltage threshold is related to the power supply voltage provided by the power supply. Further, the first controller is respectively connected to the second output terminal of the comparator and the first auxiliary circuit. The first controller can control the operation of the first auxiliary circuit according to the signal output by the comparator, that is, the first controller can control the first auxiliary circuit to stop working when the comparator outputs a high-level signal. The present invention arranges a first shunt in the first auxiliary circuit, and then connects the two ends of the first shunt to the two input ends of the amplifier, connects the output end of the amplifier to the comparator, compares the voltage at both ends of the amplified first shunt with the voltage threshold in the comparator, and outputs a high-level signal to the first controller when the voltage at both ends of the amplified first shunt is greater than the voltage threshold. After receiving the high-level signal, the first controller determines that a short circuit fault occurs in the current first auxiliary circuit, so the first controller controls the first auxiliary circuit to stop working. The present invention realizes the technical effect of automatically disconnecting the auxiliary circuit when a fault occurs in the auxiliary circuit, thereby not affecting the operation of the main circuit.

[0008] The energy storage system according to the present invention may also have the following technical features:

[0009] In some technical solutions, optionally, the energy storage system also includes: a trigger, wherein the first pin of the trigger is connected to the second output terminal of the comparator, the second pin of the trigger is connected to the power supply, the third pin of the trigger is respectively connected to the first auxiliary loop and the first port of the first controller, and the fourth pin of the trigger is connected to the second port of the first controller, and is used to maintain the high-level signal output by the comparator and send it to the first controller.

[0010] In the technical solution, the energy storage system also includes: a trigger, wherein the first pin of the trigger is connected to the second output terminal of the comparator, the second pin of the trigger is connected to the power supply, the power supply voltage provided by the power supply can be 3.3V, the third pin of the trigger is respectively connected to the first auxiliary loop and the first port of the first controller, and the fourth pin of the trigger is connected to the second port of the first controller, that is, the second output terminal of the comparator is connected to the first controller through the trigger, and the trigger can maintain the high level signal output by the comparator and send it to the first controller. Specifically, the type of the trigger can be a D trigger, wherein the first pin connected to the second output terminal of the comparator can be a CLK (Clock input) pin in the D trigger, the second pin connected to the power supply can be a D (Data input) pin, the third pin connected to the first auxiliary loop and the first controller can be a Q (Output) pin, and the fourth pin connected to the first controller can be a CLR (Clear) pin.

[0011] In some technical schemes, optionally, the energy storage system also includes: a first resistor, one end of the first resistor is connected to the power supply, and the other end of the first resistor is connected to the fourth input terminal of the comparator; a second resistor, one end of the second resistor is respectively connected to the other end of the first resistor and the fourth input terminal of the comparator, and the other end of the second resistor is grounded; wherein the first resistor and the second resistor are used to divide the power supply to obtain a voltage threshold.

[0012] In this technical solution, the energy storage system also includes: a first resistor and a second resistor. One end of the first resistor is connected to the power supply, wherein the voltage of the power supply voltage can be 3.3V, and the other end of the first resistor is connected to the fourth input terminal of the comparator. One end of the second resistor is respectively connected to the other end of the first resistor and the fourth input terminal of the comparator, and the other end of the second resistor is grounded. That is, the first resistor and the second resistor are connected in series between the power supply and the ground, and the connection between the first resistor and the second resistor is connected to the fourth input terminal of the comparator. By setting the first resistor and the second resistor, the power supply provided by the power supply battery is divided to obtain a voltage threshold, and the comparator is enabled to obtain the voltage threshold.

[0013] In some technical schemes, optionally, the first auxiliary circuit includes: a first discharge power tube, the source of which is connected to the first shunt, for controlling the first auxiliary circuit to perform discharge operation; a first drive circuit, which is respectively connected to the control electrode of the first discharge power tube, the third pin of the trigger, and the third port of the first controller, for driving the first discharge power tube.

[0014] In this technical solution, the first auxiliary circuit includes a first discharge power tube and a first drive circuit. The source of the first discharge power is connected to the first shunt, the control electrode of the first discharge power tube is connected to the first drive circuit, and then the first drive circuit is also connected to the third pin of the trigger and the third port of the first controller. When the first controller wants to control the first auxiliary circuit to stop working, the first controller can control the first drive circuit so that the first drive circuit controls the first discharge power tube to be disconnected, thereby controlling the first auxiliary circuit to stop working; when the first controller wants to control the first auxiliary circuit to start working, the first controller can control the first drive circuit so that the first drive circuit controls the first discharge power tube to be closed, thereby controlling the first auxiliary circuit to start working.

[0015] In some technical schemes, optionally, the first auxiliary circuit also includes: a first charging power tube, the source of the first charging power tube is connected to the drain of the first discharging power tube, and the drain of the first charging power tube is connected to the negative bus, which is used to control the first auxiliary circuit to perform charging; a second drive circuit, one end of the second drive circuit is connected to the control electrode of the first charging power tube, and the other end of the second drive circuit is connected to the fourth port of the first controller, which is used to drive the first charging power tube.

[0016] In this technical solution, the first auxiliary circuit also includes: a first charging power tube and a second drive circuit. Among them, the source of the first charging power tube is connected to the drain of the first discharge power tube, the drain of the first charging power tube is connected to the negative bus, and the control electrode of the first charging power tube is connected to the second drive circuit. When the first charging power tube is in a closed state, the first auxiliary circuit is in a charging working state. When the first charging power tube is in a disconnected state, the first auxiliary circuit is in a working state of stopping charging. Further, the control electrode of the first charging power tube is connected to the second drive circuit, and the second drive circuit is connected to the fourth port of the first controller. When the first controller wants to control the first auxiliary circuit to start working, the first controller can control the drive circuit so that the drive circuit controls the first discharge power tube to close, thereby realizing the control of the first auxiliary circuit to start working. When the first controller wants to control the first auxiliary circuit to stop working, the first controller can control the second drive circuit so that the second drive circuit controls the first charging power tube to be disconnected, thereby controlling the first auxiliary circuit to stop working; when the first controller wants to control the first auxiliary circuit to start working, the first controller can control the second drive circuit so that the second drive circuit controls the first charging power tube to be closed, thereby controlling the first auxiliary circuit to start working.

[0017] In some technical solutions, optionally, the energy storage system also includes: a positive bus; a main loop, one end of the main loop is connected to the positive bus, and the other end of the main loop is connected to the negative bus, wherein one end of the first shunt is connected to the main loop.

[0018] In this technical solution, the energy storage system also includes: a positive bus and a main loop. The positive bus refers to the summary point of the positive connection of all batteries in the battery pack of the energy storage system, which represents the positive connection provided by the entire battery pack to the outside. One end of the main loop is connected to the positive bus, and the other end of the main loop is connected to the negative bus. The main loop mainly outputs current to the load connected to the positive bus and the negative bus of the energy storage system. One end of the first shunt is connected to the main loop, and the connection point is located on the side close to the negative bus.

[0019] In some technical schemes, optionally, the main circuit includes: a second shunt, one end of the second shunt is connected to the first auxiliary circuit; a battery pack, one end of the battery pack is connected to the other end of the second shunt; a second charging power tube, the source of the second charging power tube is connected to the other end of the battery pack; the drain of the second discharging power tube is connected to the drain of the second charging power tube, and the source of the second discharging power tube is connected to the positive bus; a second controller, the first port of the second controller is connected to one end of the second shunt, the second port of the second controller is connected to the other end of the second shunt, the third port of the second controller is connected to the control electrode of the second discharging power tube, and the fourth port of the second controller is connected to the control electrode of the second charging power tube, which is used to control the operation of the second discharging power tube and the second charging power tube according to the voltage at both ends of the second shunt.

[0020] In this technical solution, the main circuit includes a second shunt, a battery pack, a second charging power tube, a second discharging power tube and a second controller. Among them, one end of the second shunt is connected to the first auxiliary circuit, the other end of the second shunt is connected to the battery pack, and the second shunt can determine the current of the first auxiliary circuit. One end of the battery pack is connected to one end of the second shunt, and the other end of the battery pack is connected to the source of the second charging power tube, and the battery pack can provide current for the entire energy storage system. The drain of the second charging power tube is connected to the drain of the second discharging power tube, and the source of the second discharging power tube is connected to the positive bus. That is, in the main circuit, the positive bus, the second discharging power tube, the second charging power tube, the battery pack, the shunt and the negative bus are connected in series. Further, the control electrode of the second discharging power tube is connected to the third port of the second controller, the control electrode of the second charging power tube is connected to the fourth port of the second controller, one end of the second shunt is connected to the first port of the second controller, and the other end of the second shunt is connected to the second port of the second controller. When the voltage across the shunt is greater than a preset voltage, the second controller controls the second discharge power tube and the second charge power tube to be disconnected, thereby protecting the main circuit.

[0021] In some technical solutions, optionally, the main circuit also includes: a first fuse, one end of the first fuse is connected to the battery pack, and the other end of the first fuse is connected to the source of the second charging power tube.

[0022] In this technical solution, the main circuit also includes: a first fuse. One end of the first fuse is connected to the battery pack, and the other end of the first fuse is connected to the source of the second charging power tube. That is, the first fuse is connected in series between the battery pack and the second charging power tube. By setting the first fuse in the main circuit, when a fault occurs, the main circuit can be stopped by disconnecting the first fuse, thereby ensuring the normal use of the battery pack and the second charging power tube.

[0023] In some technical solutions, optionally, the energy storage system also includes: a second auxiliary circuit, the second auxiliary circuit is connected to the main circuit, the second auxiliary circuit includes: a second fuse, one end of the second fuse is connected to the main circuit, and the other end of the second fuse is connected to the positive bus.

[0024] In this technical solution, the energy storage system also includes: a second auxiliary circuit, which is connected to the main circuit, and the connection point is located on the positive bus side. The second auxiliary circuit includes a second fuse, one end of the second fuse is connected to the main circuit, and the other end of the second fuse is connected to the positive bus. When the current is too large, the second fuse is disconnected, so that the second auxiliary circuit stops working.

[0025] According to a second aspect of the present invention, a control method for an energy storage system is proposed, which is used for the energy storage system in any of the above technical solutions, including: obtaining a first voltage of a first shunt; performing operational amplification processing on the first voltage to obtain a second voltage; matching the second voltage with a voltage threshold; and controlling the first auxiliary circuit to stop working when the second voltage is greater than or equal to the voltage threshold.

[0026] The control method of the energy storage system proposed in the present invention is mainly used for the energy storage system in any of the above technical solutions. Among them, the control method of the energy storage system mainly includes: first, obtaining the first voltage at both ends of the first shunt. Since the first shunt is connected in series on the first auxiliary circuit, the current of the first shunt is the same as the current on the first auxiliary circuit, so the first voltage at both ends of the first shunt corresponds to the current of the first auxiliary circuit. After obtaining the first voltage, the first voltage is amplified by an amplifier to obtain a second voltage. Then, the second voltage is matched with the voltage threshold in the comparator, wherein the voltage threshold is related to the power supply voltage. When the second voltage is less than the voltage threshold, it means that the current of the first auxiliary circuit is the current in the normal state at this time, so no operation is required. When the second voltage is greater than or equal to the voltage threshold, it means that the first auxiliary circuit is in a short circuit fault at this time, so the power tube in the first auxiliary circuit can be controlled to be disconnected, so that the first auxiliary circuit stops working. The present invention sets a first shunt in the first auxiliary circuit, then obtains the voltage at both ends of the first shunt, amplifies the voltage at both ends of the first shunt, compares the amplified voltage at both ends of the first shunt with the voltage threshold in the comparator, and when the amplified voltage at both ends of the first shunt is greater than the voltage threshold, determines that a short circuit fault occurs in the current first auxiliary circuit, and then controls the first auxiliary circuit to stop working. The present invention realizes the technical effect of automatically disconnecting the auxiliary circuit when a fault occurs in the auxiliary circuit, thereby not affecting the operation of the main circuit.

[0027] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0029] Figure 1 A schematic diagram of the structure of an energy storage system in the related art is shown;

[0030] Figure 2 One of the structural schematic diagrams of an energy storage system according to an embodiment of the present invention is shown;

[0031] Figure 3 A second structural schematic diagram of an energy storage system according to an embodiment of the present invention is shown;

[0032] Figure 4 One of the flow charts of a method for controlling an energy storage system according to an embodiment of the present invention is shown;

[0033] Figure 5 A second flowchart of a method for controlling an energy storage system according to an embodiment of the present invention is shown.

[0034] in, Figure 1 The corresponding relationship between the reference numerals and the component names is as follows:

[0035] 10' energy storage system, 102' main circuit, 104' first auxiliary circuit, 106' second auxiliary circuit, 108' shunt, 110' first controller, 112' second controller, 114' drive circuit, 116' first discharge power tube, 118' second discharge power tube, 120' positive bus, 122' negative bus.

[0036] Figure 2 and Figure 3 The corresponding relationship between the reference numerals and the component names is as follows:

[0037] 10 energy storage system, 102 negative bus, 104 first auxiliary circuit, 106 first shunt, 108 amplifier, 110 comparator, 112 first controller, 114 trigger, 116 first resistor, 118 second resistor, 120 power supply, 122 first discharge power tube, 124 first drive circuit, 126 positive bus, 128 main circuit, 130 second shunt, 132 second discharge power tube, 134 second controller, 136 second auxiliary circuit, 138 second fuse, 140 battery pack, 142 first charging power tube, 144 second drive circuit, 146 second charging power tube, 148 first fuse. DETAILED DESCRIPTION

[0038] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0039] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0040] like Figure 1 As shown, Figure 1It is a structural diagram of an energy storage system 10' in the related art, wherein the energy storage system 10' mainly includes: a main circuit 102', a first auxiliary circuit 104' and a second auxiliary circuit 106'. The connection point between the first auxiliary circuit 104' and the main circuit 102' is on the negative bus 122' side, and the connection point between the second auxiliary circuit 106' and the main circuit 102' is on the positive bus 120' side. The first auxiliary circuit 104' includes: a first discharge power tube 116', the first discharge power tube 116' is connected to the first controller 110' through the drive circuit 114', and the first controller 110' can control the first discharge power tube 116' to switch between closed or open through the drive circuit 114'. The shunt 108' in the main circuit 102' is connected to the first auxiliary circuit 104'. The main circuit 102' also includes a second discharge power tube 118' and a second controller 112', wherein the second controller 112' is connected to the shunt 108' and can obtain the voltage at both ends of the shunt 108'. The second controller 112' is also connected to the second discharge power tube 118' and can control the second discharge power tube 118' to be opened or closed. Since the shunt 108' is connected in series with the first auxiliary circuit 104', when the first auxiliary circuit 104' fails, the voltage at both ends of the shunt 108' will change. When the voltage at both ends of the shunt 108' changes, the second controller 112' will control the second discharge power tube 118' to be opened, so that the main circuit 102', the first auxiliary circuit 104' and the second auxiliary circuit 106' all stop working, thereby protecting the energy storage system 10'. It can be seen that in the related art, when the first auxiliary circuit 104' fails, the normal operation of the main circuit 102' will be affected.

[0041] like Figure 2 and Figure 3 As shown, the present invention proposes an energy storage system 10 including: a negative bus 102; a first auxiliary loop 104, the first auxiliary loop 104 is connected to the negative bus 102, and the first auxiliary loop 104 includes a first shunt 106; an amplifier 108, a first input end of the amplifier 108 is connected to one end of the first shunt 106, and a second input end of the amplifier 108 is connected to the other end of the first shunt 106, for amplifying a first voltage of the first shunt 106 to obtain a second voltage; a comparator 110, a third input end of the comparator 110 is connected to a first output end of the amplifier 108, and a fourth input end of the comparator 110 is connected to a power supply 120, for outputting a high level signal based on the second voltage being greater than a voltage threshold; a first controller 112, the first controller 112 is connected to the second output end of the comparator 110, and the first controller 112 is also connected to the first auxiliary loop 104, for controlling the first auxiliary loop 104 to stop working based on the comparator 110 outputting a high level signal.

[0042] The energy storage system 10 provided by the present invention is as follows: Figure 2 and Figure 3As shown, it mainly includes: a negative bus 102, a first auxiliary loop 104, a first shunt 106, an amplifier 108, a comparator 110 and a first controller 112. Among them, the negative bus 102 refers to the summary point of the negative connection of all batteries in the battery pack 140 in the energy storage system 10, which represents the negative connection provided to the outside by the entire battery pack 140. The first auxiliary loop 104 is arranged near the negative bus 102, connected to the negative bus 102, and can assist the main loop 128 in outputting current. Among them, a first shunt 106 is arranged in the first auxiliary loop 104, and the first shunt 106 can detect the current of the first auxiliary loop 104, and then determine the voltage across the first shunt 106, and then determine the working state of the first auxiliary loop 104. The first input terminal of the amplifier 108 is connected to one end of the first shunt 106, and the second input terminal of the amplifier 108 is connected to the other end of the first shunt 106, that is, the amplifier 108 is connected in parallel with the first shunt 106. The amplifier 108 can be a differential amplifier or a current amplifier. The amplifier 108 can obtain the first voltage across the first shunt 106, and then amplify the first voltage to obtain the second voltage. The third input terminal of the comparator 110 is connected to the first output terminal of the amplifier 108, and the fourth input terminal of the comparator 110 is connected to the power supply 120. The comparator 110 can compare the second voltage output by the amplifier 108 with the voltage threshold. When the second voltage is greater than the voltage threshold, the comparator 110 will output a high level signal. The voltage threshold is related to the power supply voltage provided by the power supply 120. Further, the first controller 112 is connected to the second output terminal of the comparator 110 and the first auxiliary circuit 104 respectively, and the first controller 112 can control the first auxiliary circuit 104 to work according to the signal output by the comparator 110, that is, the first controller 112 can control the first auxiliary circuit 104 to stop working when the comparator 110 outputs a high-level signal. The first controller 112 can be an MCU (Microcontroller Unit) controller. The present invention sets a first shunt 106 in the first auxiliary loop 104, then connects the two ends of the first shunt 106 to the two input ends of the amplifier 108, connects the output end of the amplifier 108 to the comparator 110, compares the voltage at both ends of the amplified first shunt 106 with the voltage threshold in the comparator 110, and outputs a high-level signal to the first controller 112 when the voltage at both ends of the amplified first shunt 106 is greater than the voltage threshold. After receiving the high-level signal, the first controller 112 determines that a short-circuit fault occurs in the current first auxiliary loop 104, so the first controller 112 controls the first auxiliary loop 104 to stop working. The present invention realizes the technical effect of automatically disconnecting the auxiliary loop when a fault occurs in the auxiliary loop, thereby not affecting the operation of the main loop 128.

[0043] In some embodiments, optionally, Figure 2 and Figure 3 As shown, the energy storage system 10 also includes: a trigger 114, a first pin of the trigger 114 is connected to the second output end of the comparator 110, a second pin of the trigger 114 is connected to the power supply 120, a third pin of the trigger 114 is respectively connected to the first auxiliary loop 104 and the first port of the first controller 112, and a fourth pin of the trigger 114 is connected to the second port of the first controller 112, for maintaining the high level signal output by the comparator 110 and sending it to the first controller 112.

[0044] In this embodiment, the energy storage system 10 also includes: a trigger 114, wherein a first pin of the trigger 114 is connected to the second output terminal of the comparator 110, a second pin of the trigger 114 is connected to the power supply 120, and the power supply voltage provided by the power supply 120 may be 3.3V, a third pin of the trigger 114 is respectively connected to the first auxiliary loop 104 and the first port of the first controller 112, and a fourth pin of the trigger 114 is connected to the second port of the first controller 112, that is, the second output terminal of the comparator 110 is connected to the first controller 112 through the trigger 114, and the trigger 114 can maintain the high level signal output by the comparator 110 and send it to the first controller 112. Specifically, the type of the trigger 114 can be a D trigger, wherein the first pin connected to the second output end of the comparator 110 can be a CLK (Clock input) pin in the D trigger, the second pin connected to the power supply 120 can be a D (Data input) pin, the third pin connected to the first auxiliary loop 104 and the first controller 112 can be a Q (Output) pin, and the fourth pin connected to the first controller 112 can be a CLR (Clear) pin, wherein, when the first controller 112 can be an MCU (Microcontroller Unit) controller, the first port can be a short-detect port, and the second port can be a short-release port.

[0045] In some embodiments, optionally, Figure 2 and Figure 3As shown, the energy storage system 10 also includes: a first resistor 116, one end of the first resistor 116 is connected to the power supply 120, and the other end of the first resistor 116 is connected to the fourth input terminal of the comparator 110; a second resistor 118, one end of the second resistor 118 is respectively connected to the other end of the first resistor 116 and the fourth input terminal of the comparator 110, and the other end of the second resistor 118 is grounded; wherein the first resistor 116 and the second resistor 118 are used to divide the power supply 120 to obtain a voltage threshold.

[0046] In this embodiment, the energy storage system 10 further includes: a first resistor 116 and a second resistor 118. One end of the first resistor 116 is connected to the power supply 120, wherein the voltage of the power supply voltage may be 3.3V, and the other end of the first resistor 116 is connected to the fourth input terminal of the comparator 110. One end of the second resistor 118 is respectively connected to the other end of the first resistor 116 and the fourth input terminal of the comparator 110, and the other end of the second resistor 118 is grounded. That is, the first resistor 116 and the second resistor 118 are connected in series between the power supply 120 and the ground, and the connection between the first resistor 116 and the second resistor 118 is connected to the fourth input terminal of the comparator 110. By setting the first resistor 116 and the second resistor 118, the power supply voltage provided by the power supply 120 is divided, thereby obtaining a voltage threshold, and enabling the comparator 110 to obtain the voltage threshold.

[0047] In some embodiments, optionally, Figure 2 and Figure 3 As shown, the first auxiliary circuit 104 includes: a first discharge power tube 122, the source of which is connected to the first shunt 106, for controlling the first auxiliary circuit 104 to perform discharge operation; a first drive circuit 124, the first drive circuit 124 is respectively connected to the control electrode of the first discharge power tube 122, the third pin of the trigger 114 and the third port of the first controller 112, for driving the first discharge power tube 122.

[0048] In this embodiment, the first auxiliary circuit 104 includes a first discharge power tube 122 and a first drive circuit 124. The source of the first discharge power tube 122 is connected to the first shunt 106, the control electrode of the first discharge power tube 122 is connected to the first drive circuit 124, and then the first drive circuit 124 is also connected to the third pin of the trigger 114 and the third port of the first controller 112. When the first controller 112 wants to control the first auxiliary circuit 104 to stop working, the first controller 112 can control the first drive circuit 124 so that the first drive circuit 124 controls the first discharge power tube 122 to be disconnected, thereby controlling the first auxiliary circuit 104 to stop working; when the first controller 112 wants to control the first auxiliary circuit 104 to start working, the first controller 112 can control the first drive circuit 124 so that the first drive circuit 124 controls the first discharge power tube 122 to be closed, thereby controlling the first auxiliary circuit 104 to start working.

[0049] In some embodiments, optionally, Figure 2 and Figure 3 As shown, the first auxiliary circuit 104 also includes: a first charging power tube 142, the source of the first charging power tube 142 is connected to the drain of the first discharging power tube 122, and the drain of the first charging power tube 142 is connected to the negative bus 102, which is used to control the first auxiliary circuit 104 to perform charging work; a second drive circuit 144, one end of the second drive circuit 144 is connected to the control electrode of the first charging power tube 142, and the other end of the second drive circuit 144 is connected to the fourth port of the first controller 112, which is used to drive the first charging power tube 142.

[0050] In this embodiment, the first auxiliary circuit 104 also includes: a first charging power tube 142 and a second drive circuit 144. Among them, the source of the first charging power tube 142 is connected to the drain of the first discharge power tube 122, the drain of the first charging power tube 142 is connected to the negative bus 102, and the control electrode of the first charging power tube 142 is connected to the second drive circuit 144. When the first charging power tube 142 is in a closed state, the first auxiliary circuit 104 is in a charging working state. When the first charging power tube 142 is in a disconnected state, the first auxiliary circuit 104 is in a stopped charging working state. Further, the control electrode of the first charging power tube 142 is connected to the second drive circuit 144, and the second drive circuit 144 is connected to the fourth port of the first controller 112. When the first controller 112 wants to control the first auxiliary circuit 104 to start working, the first controller 112 can control the drive circuit so that the drive circuit controls the first discharge power tube 122 to close, thereby realizing the control of the first auxiliary circuit 104 to start working. When the first controller 112 wants to control the first auxiliary circuit 104 to stop working, the first controller 112 can control the second drive circuit 144 so that the second drive circuit 144 controls the first charging power tube 142 to be disconnected, thereby controlling the first auxiliary circuit 104 to stop working; when the first controller 112 wants to control the first auxiliary circuit 104 to start working, the first controller 112 can control the second drive circuit 144 so that the second drive circuit 144 controls the first charging power tube 142 to be closed, thereby controlling the first auxiliary circuit 104 to start working.

[0051] In some embodiments, optionally, Figure 2 As shown, the energy storage system 10 also includes: a positive bus 126; a main loop 128, one end of the main loop 128 is connected to the positive bus 126, and the other end of the main loop 128 is connected to the negative bus 102, wherein one end of the first shunt 106 is connected to the main loop 128.

[0052] In this embodiment, the energy storage system 10 further includes: a positive bus 126 and a main loop 128. The positive bus 126 refers to the summary point of the positive connection of all batteries in the battery pack 140 in the energy storage system 10, which represents the positive connection provided to the outside by the entire battery pack 140. One end of the main loop 128 is connected to the positive bus 126, and the other end of the main loop 128 is connected to the negative bus 102. The main loop 128 mainly outputs current to the load connected to the positive bus 126 and the negative bus 102 of the energy storage system 10. One end of the first shunt 106 is connected to the main loop 128, and the connection point is located on the side close to the negative bus 102.

[0053] In some embodiments, optionally, Figure 2As shown, the main circuit 128 includes: a second shunt 130, one end of the second shunt 130 is connected to the first auxiliary circuit 104; a battery pack 140, one end of the battery pack 140 is connected to the other end of the second shunt 130; a second charging power tube 146, the source of the second charging power tube 146 is connected to the other end of the battery pack 140; the drain of the second discharging power tube 132 is connected to the drain of the second charging power tube 146, and the source of the second discharging power tube 132 is connected to the positive bus 126; The second controller 134, the first port of the second controller 134 is connected to one end of the second shunt 130, the second port of the second controller 134 is connected to the other end of the second shunt 130, the third port of the second controller 134 is connected to the control electrode of the second discharge power tube 132, and the fourth port of the second controller 134 is connected to the control electrode of the second charging power tube 146, which is used to control the operation of the second discharge power tube 132 and the second charging power tube 146 according to the voltage at both ends of the second shunt 130.

[0054] In this embodiment, the main circuit 128 includes a second shunt 130, a battery pack 140, a second charging power tube 146, a second discharging power tube 132 and a second controller 134. Among them, one end of the second shunt 130 is connected to the first auxiliary circuit 104, and the other end of the second shunt 130 is connected to the battery pack 140. The second shunt 130 can determine the current of the first auxiliary circuit 104. One end of the battery pack 140 is connected to one end of the second shunt 130, and the other end of the battery pack 140 is connected to the source of the second charging power tube 146. The battery pack 140 can provide current for the entire energy storage system 10. The drain of the second charging power tube 146 is connected to the drain of the second discharging power tube 132, and the source of the second discharging power tube 132 is connected to the positive bus 126. That is, in the main circuit 128, the positive bus 126, the second discharge power tube 132, the second charging power tube 146, the battery pack 140, the shunt and the negative bus 102 are connected in series. Further, the control electrode of the second discharge power tube 132 is connected to the third port of the second controller 134, the control electrode of the second charging power tube 146 is connected to the fourth port of the second controller 134, one end of the second shunt 130 is connected to the first port of the second controller 134, and the other end of the shunt is connected to the second port of the second controller 134. Among them, the second controller 134 can be an AFE (Analog Front End Controller). When the voltage across the second shunt 130 is greater than the preset voltage, the second controller 134 controls the second discharge power tube 132 and the second charging power tube 146 to be disconnected, thereby realizing the protection of the main circuit 128.

[0055] In some embodiments, optionally, Figure 2 As shown, the main circuit 128 also includes: a first fuse 148 , one end of the first fuse 148 is connected to the battery pack 140 , and the other end of the first fuse 148 is connected to the source of the second charging power tube 146 .

[0056] In this embodiment, the main circuit 128 further includes: a first fuse 148. One end of the first fuse 148 is connected to the battery pack 140, and the other end of the first fuse 148 is connected to the source of the second charging power tube 146. That is, the first fuse 148 is connected in series between the battery pack 140 and the second charging power tube 146. By setting the first fuse 148 in the main circuit 128, when a fault occurs, the first fuse 148 can be disconnected, so that the main circuit 128 stops working, thereby ensuring the normal use of the battery pack 140 and the second charging power tube 146.

[0057] In some embodiments, optionally, Figure 2 As shown, the energy storage system 10 also includes: a second auxiliary circuit 136, the second auxiliary circuit 136 is connected to the main circuit 128, and the second auxiliary circuit 136 includes: a second fuse 138, one end of the second fuse 138 is connected to the main circuit 128, and the other end of the second fuse 138 is connected to the positive bus 126.

[0058] In this embodiment, the energy storage system 10 further includes: a second auxiliary circuit 136, the second auxiliary circuit 136 is connected to the main circuit 128, and the connection point is located on one side of the positive bus 126. The second auxiliary circuit 136 includes a second fuse 138, one end of the second fuse 138 is connected to the main circuit 128, and the other end of the second fuse 138 is connected to the positive bus 126. When the current is too large, the second fuse 138 is disconnected, so that the second auxiliary circuit 136 stops working.

[0059] Figure 4 One of the flow charts of a control method of an energy storage system according to an embodiment of the present invention is shown; wherein the control method of the energy storage system is used for the energy storage system in any of the above embodiments, and the control method of the energy storage system includes:

[0060] Step 402: Obtain a first voltage of a first shunt;

[0061] Step 404: performing operational amplification processing on the first voltage to obtain a second voltage;

[0062] Step 406: Match the second voltage with the voltage threshold;

[0063] Step 408: When the second voltage is greater than or equal to the voltage threshold, control the first auxiliary circuit to stop working.

[0064] The control method of the energy storage system proposed in the present invention is mainly used for the energy storage system in any of the above technical solutions. Among them, the control method of the energy storage system mainly includes: first, obtaining the first voltage at both ends of the first shunt. Since the first shunt is connected in series on the first auxiliary circuit, the current of the first shunt is the same as the current on the first auxiliary circuit, so the first voltage at both ends of the first shunt corresponds to the current of the first auxiliary circuit. After obtaining the first voltage, the first voltage is amplified by an amplifier to obtain a second voltage. Then, the second voltage is matched with the voltage threshold in the comparator, wherein the voltage threshold is related to the power supply voltage. When the second voltage is less than the voltage threshold, it means that the current of the first auxiliary circuit is the current in the normal state at this time, so no operation is required. When the second voltage is greater than or equal to the voltage threshold, it means that the first auxiliary circuit is in a short circuit fault at this time, so the power tube in the first auxiliary circuit can be controlled to be disconnected, so that the first auxiliary circuit stops working. The present invention sets a first shunt in the first auxiliary circuit, then obtains the voltage at both ends of the first shunt, amplifies the voltage at both ends of the first shunt, compares the amplified voltage at both ends of the first shunt with the voltage threshold in the comparator, and when the amplified voltage at both ends of the first shunt is greater than the voltage threshold, determines that a short circuit fault occurs in the current first auxiliary circuit, and then controls the first auxiliary circuit to stop working. The present invention realizes the technical effect of automatically disconnecting the auxiliary circuit when a fault occurs in the auxiliary circuit, thereby not affecting the operation of the main circuit.

[0065] Figure 5 A second flow chart of a method for controlling an energy storage system according to an embodiment of the present invention is shown; wherein the method for controlling an energy storage system includes:

[0066] Step 502: the discharge tube is closed;

[0067] Step 504: Obtain the voltage of the shunt;

[0068] Step 506: The current amplifier amplifies the voltage;

[0069] Step 508: The comparator compares whether the voltage is greater than the voltage threshold. If the result is yes, execute step 510; if the result is no, execute step 516;

[0070] Step 510: the Q pin of the D flip-flop outputs a high level, and the MCU control signal becomes a low level;

[0071] Step 512: the auxiliary circuit discharge tube is turned off for short circuit protection;

[0072] Step 514: After 1 minute, the D flip-flop is cleared and the Q pin outputs a low level;

[0073] Step 516: The D flip-flop does not act.

[0074] The control method of the energy storage system provided by the present invention comprises the following steps: firstly, a shunt is connected in series to an auxiliary circuit, one end of the shunt is connected to PCACK- (negative bus), and the other end is connected to the S pole of the discharge tube of the auxiliary circuit; the negative pole (IN-) of the input end of the current amplifier is connected to the end of the shunt close to PACK-, and the positive pole (IN+) of the input end is connected to the end of the shunt close to the discharge tube. The output of the current amplifier is connected to the positive pole (IN+) of the input end of the comparator, and the negative pole (IN-) of the input end of the comparator is connected to the first resistor and the second resistor, wherein the other end of the first resistor is connected to the VCC power supply, and the other end of the second resistor is grounded; the output of the comparator is connected to the CLK pin of the D trigger, the D pin of the D trigger is connected to the VCC power supply, the Q pin of the D trigger is connected to the discharge tube drive circuit, the CLR pin is connected to the short-release port of the MCU, and the Q of the D trigger is simultaneously connected to the short-detect port of the MCU, and the MCU is also connected to the drive circuit of the discharge tube. Then in the work, first the discharge tube is closed and the auxiliary circuit works. If the short-circuit current threshold is set to 100A, the resistance value of the shunt is 0.2mR, and VCC is 3.3V; when the peak current appears 100A, the shunt detects the discharge current of the auxiliary circuit, and the generated voltage is amplified 50 times by the input end of the overcurrent amplifier. The output voltage of the amplifier is 100×0.2×0.001×50=1(V), which enters the positive input end of the comparator. The first resistor is set to 100K, and the second resistor is set to 43K. The voltage of the negative input end of the comparator is 0.99V, that is, the voltage threshold is 0.99V. When the amplifier output When the voltage is greater than the voltage threshold, such as 1V is greater than 0.99V, the comparator outputs a high level and enters the CLK pin of the D flip-flop. At this time, the CLK pin of the D flip-flop has a rising edge, the D pin is always high, and the CLR pin is high, then the Q pin outputs a high level, pulling down the discharge tube drive circuit, causing the VGS voltage to drop to 0V, thereby closing the discharge tube of the auxiliary circuit; at the same time, after the MCU short-circuit detection short-detect detects a high level, the control signal becomes a low level, thereby closing the discharge tube of the auxiliary circuit; finally, after 1 minute, the CLR pin of the D flip-flop is pulled low to clear the latch of the Q pin, thereby controlling the discharge tube to close.

[0075] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance unless otherwise clearly specified and limited; the terms "connection", "installation", "fixation" and the like should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0076] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An energy storage system, characterized in that: include: Negative bus; A first auxiliary circuit, the first auxiliary circuit is connected to the negative bus, and the first auxiliary circuit includes a first shunt; an amplifier, wherein a first input end of the amplifier is connected to one end of the first shunt, and a second input end of the amplifier is connected to the other end of the first shunt, and is used to amplify the first voltage of the first shunt to obtain a second voltage; a comparator, wherein a third input terminal of the comparator is connected to the first output terminal of the amplifier, and a fourth input terminal of the comparator is connected to a power supply, and is configured to output a high level signal when the second voltage is greater than a voltage threshold; A first controller is connected to the second output terminal of the comparator. The first controller is also connected to the first auxiliary circuit and is used for controlling the first auxiliary circuit to stop working when the comparator outputs a high level signal.

2. The energy storage system according to claim 1, characterized in that: Also includes: A trigger, wherein a first pin of the trigger is connected to the second output terminal of the comparator, a second pin of the trigger is connected to a power supply, a third pin of the trigger is respectively connected to the first auxiliary loop and the first port of the first controller, and a fourth pin of the trigger is connected to the second port of the first controller, for maintaining the high level signal output by the comparator and sending it to the first controller.

3. The energy storage system according to claim 2, characterized in that: Also includes: a first resistor, one end of the first resistor being connected to the power supply, and the other end of the first resistor being connected to the fourth input end of the comparator; a second resistor, one end of the second resistor being connected to the other end of the first resistor and the fourth input end of the comparator respectively, and the other end of the second resistor being grounded; The first resistor and the second resistor are used to divide the power supply to obtain the voltage threshold.

4. The energy storage system according to claim 2, characterized in that: The first auxiliary circuit comprises: A first discharge power tube, wherein the source of the first discharge power tube is connected to the first shunt and is used to control the first auxiliary circuit to perform a discharge operation; A first driving circuit is respectively connected to the control electrode of the first discharge power tube, the third pin of the trigger and the third port of the first controller, and is used to drive the first discharge power tube.

5. The energy storage system according to claim 4, characterized in that: The first auxiliary circuit also includes: a first charging power tube, wherein the source of the first charging power tube is connected to the drain of the first discharging power tube, and the drain of the first charging power tube is connected to the negative electrode bus, and is used to control the first auxiliary circuit to perform charging; A second driving circuit, one end of the second driving circuit is connected to the control electrode of the first charging power tube, and the other end of the second driving circuit is connected to the fourth port of the first controller, and is used to drive the first charging power tube.

6. The energy storage system according to any one of claims 1 to 5, characterized in that: Also includes: Positive bus; A main circuit, one end of the main circuit is connected to the positive bus, and the other end of the main circuit is connected to the negative bus, wherein one end of the first shunt is connected to the main circuit.

7. The energy storage system according to claim 6, characterized in that: The main circuit comprises: a second shunt, one end of which is connected to the first auxiliary circuit; a battery pack, one end of the battery pack being connected to the other end of the second shunt; a second charging power tube, wherein a source electrode of the second charging power tube is connected to the other end of the battery pack; a second discharging power tube, wherein the drain of the second discharging power tube is connected to the drain of the second charging power tube, and the source of the second discharging power tube is connected to the positive bus; A second controller, a first port of the second controller is connected to one end of the second shunt, a second port of the second controller is connected to the other end of the second shunt, a third port of the second controller is connected to the control electrode of the second discharge power tube, and a fourth port of the second controller is connected to the control electrode of the second charging power tube, and is used to control the operation of the second discharge power tube and the second charging power tube according to the voltage across the second shunt.

8. The energy storage system according to claim 7, characterized in that: The main circuit also includes: A first fuse, one end of the first fuse is connected to the battery pack, and the other end of the first fuse is connected to the source of the second charging power tube.

9. The energy storage system according to claim 6, characterized in that: Also includes: A second auxiliary circuit, the second auxiliary circuit is connected to the main circuit, and the second auxiliary circuit includes: a second fuse, one end of the second fuse is connected to the main circuit, and the other end of the second fuse is connected to the positive bus.

10. A control method for an energy storage system, used in the energy storage system according to any one of claims 1 to 9, characterized in that: include: obtaining a first voltage of a first shunt; Performing operational amplification processing on the first voltage to obtain a second voltage; matching the second voltage with a voltage threshold; When the second voltage is greater than or equal to the voltage threshold, the first auxiliary circuit is controlled to stop working.

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