Energy storage apparatus and energy storage apparatus open circuit control method

Abstract

The present application provides an energy storage apparatus and an energy storage apparatus open circuit control method. The energy storage apparatus comprises a main loop formed by multiple battery modules sequentially connected in series, and the energy storage apparatus is further provided with a detection module, an open circuit protection module connected in series with the main loop of the energy storage apparatus, and an open circuit detection module; the detection module is configured to detect a working state of the energy storage apparatus and connect the open circuit protection module when it is detected that the energy storage apparatus has failed; the open circuit protection module is configured to output an open circuit driving power supply after being connected; by means of the open circuit driving power supply, a circuit breaker in the main loop of the energy storage apparatus is driven to be disconnected, and a connecting loop of the energy storage apparatus and external devices is disconnected; and the open circuit detection module is configured to perform sampling current detection on the open circuit protection module regularly, and output a shunt failure signal when the sampling current does not meet preset conditions.

Description

Energy storage device and circuit breaker control method for energy storage device

[0001] This application is based on the Chinese patent application with application number CN202310642697.1 and application date June 1, 2023, and claims the priority of the Chinese patent application. The entire content of the above patent application is hereby introduced into this application as a reference. Technical Field

[0002] The present application relates to the field of energy storage devices, and in particular to an energy storage device and a method for controlling circuit breaker of the energy storage device. Background Art

[0003] With the increasing popularity of new energy vehicles and the proposed goals of "carbon neutrality" and "carbon peak," society's energy structure is shifting toward electricity. This requires energy storage systems in new energy vehicles, as well as in photovoltaic and wind power generation. When energy storage systems are composed of multiple battery modules connected in series, existing technologies employ separate control schemes for each battery to improve system stability. Each battery can be independently connected or disconnected from the main circuit without affecting other batteries.

[0004] However, for products adopting this technical solution, in the existing technology, if the main power supply of the energy storage device fails, the user may still mistakenly close the energy storage device circuit. After closing, the energy storage device has no effective disconnection measures. When the main power supply has failed, charging the battery again will cause the battery to overcharge, posing a greater safety risk.

[0005] The reference to any prior art in the specification is not an acknowledgement or suggestion that the prior art forms part of the common general knowledge in any jurisdiction, or that it could reasonably be expected that the person skilled in the art would understand, consider relevant and / or combine with other prior art. Summary of the Invention

[0006] The purpose of this application is to provide an energy storage device and a circuit breaker control method for the energy storage device to solve the above problems.

[0007] To achieve one of the above-mentioned objectives, one embodiment of the present invention provides an energy storage device comprising a main circuit formed by a plurality of battery modules connected in series. The energy storage device is capable of connecting to an external device to form a circuit. Each battery module comprises a battery cell, a control unit, and a switch group. The control unit is configured to control the switch group to connect a single battery module in series with or bypass the main circuit of the energy storage device. When a battery module is bypassed, a path connecting the battery modules before and after is formed within the battery module. The energy storage device is further provided with a detection module, a circuit breaker protection module connected in series with the main circuit of the energy storage device, and a circuit breaker detection module.

[0008] The detection module is configured to detect the working state of the energy storage device and turn on the circuit breaker protection module when it is detected that the energy storage device fails;

[0009] The circuit breaker protection module is configured to output a circuit breaker driving power supply after being turned on, and drive the circuit breaker in the main circuit of the energy storage device to disconnect the connection circuit between the energy storage device and the external device through the circuit breaker driving power supply;

[0010] The circuit breaker detection module is configured to periodically perform sampling current detection on the circuit breaker protection module, and output a shunt failure signal when the sampling current does not meet a preset condition.

[0011] As a further improvement of the implementation mode of the present application, the detection module includes a normally closed switch module connected in series with the circuit breaker protection module, the normally closed switch module includes a normally closed switch and a normally closed switch control circuit connected to the normally closed switch, and the normally closed switch module is configured to determine that the energy storage device has failed and conduct the normally closed switch after losing the control unit signal or receiving the corresponding control unit signal.

[0012] As a further improvement of the implementation mode of the present application, the circuit breaker protection module also includes a power supply module and a shunt release, the input end of the power supply module is connected to the main circuit of the energy storage circuit, the output end of the power supply module is connected to the shunt release, and the normally closed switch module is connected between the input end of the power supply module and the negative pole of the main circuit of the energy storage circuit.

[0013] As a further improvement to the embodiment of the present application, the circuit breaker protection module includes a power output switch module, which includes a power output switch and a power output switch control circuit connected to the power output switch. The power output switch module is configured to close the power output switch when the power module outputs the circuit breaker drive power, so that the circuit breaker drive power reaches the shunt release, driving the shunt release to disconnect the circuit breaker.

[0014] As a further improvement of the embodiment of the present application, the circuit breaker protection module also includes a timing circuit connected in series with the power output switch control circuit, and the timing circuit is configured to output a closing signal at a fixed time after power is supplied by the circuit breaker driving power supply, and the power output switch module is configured to drive the power output switch to close after receiving the closing signal.

[0015] As a further improvement to the implementation mode of the present application, the circuit break detection module includes a shunt drive power supply, a shunt sampling resistor connected in series with the shunt release, a comparator arranged on the side of the shunt sampling resistor, and a shunt detection control unit. The comparator and the shunt detection control unit are configured to output a shunt failure signal to the shunt detection control unit when detecting that the voltage on the side of the shunt sampling resistor exceeds a preset voltage.

[0016] As a further improvement to the embodiment of the present application, each of the battery modules also includes a current detection module, which is connected in series with the battery and the switch group. The current detection module is configured to control the switch group to bypass the battery module out of the main circuit of the energy storage device when it detects that the battery module is in an overcurrent state.

[0017] As a further improvement of the implementation mode of the present application, the current detection module includes a shunt resistor connected in series with the battery and the switch group, and a current detection amplifier and a high-speed comparator located on the shunt resistor side. The control unit is configured to drive the switch group to bypass the battery module out of the main circuit of the energy storage device when it detects that the voltage across the shunt resistor exceeds a preset threshold.

[0018] The present invention also provides a method for controlling circuit breaker of an energy storage device, which comprises the steps of:

[0019] The circuit breaker protection module is sampled and tested regularly. When the sampled current does not meet the preset conditions, a circuit breaker protection module failure signal is output; when the sampled current meets the preset conditions, the main power supply of the energy storage device is tested;

[0020] When the main power supply of the energy storage device fails, the power module is turned on to output the circuit-breaking driving power supply;

[0021] The circuit breaker driving power supply supplies power to the shunt release, and the shunt release works to disconnect the circuit breaker in the main circuit of the energy storage device.

[0022] As a further improvement to the embodiment of the present application, when the main power supply of the energy storage device is detected to fail, the power supply module is turned on to output the circuit-breaking driving power supply, specifically including:

[0023] When the circuit breaker is closed and it is detected that the main power supply voltage of the energy storage device does not meet the preset range, the normally closed switch is turned on and the circuit breaker driving power is output through the power module.

[0024] As a further improvement to the embodiment of the present application, when the main power supply of the energy storage device is detected to fail, the power supply module is turned on to output the circuit-breaking driving power supply, specifically including:

[0025] When the circuit breaker disconnect instruction needs to be executed and the circuit breaker fails to disconnect, the normally closed switch is turned on and the circuit breaker driving power is output through the power module.

[0026] As a further improvement to the embodiment of the present application, when the main power supply of the energy storage device is detected to fail, the power supply module is turned on to output the circuit-breaking driving power supply, specifically including:

[0027] When the control unit is reset and there is no signal at the input / output port, the normally closed switch is turned on and the output of the circuit-breaking drive power is output through the power module.

[0028] As a further improvement to the embodiment of the present application, when the sampled current does not meet the preset conditions, outputting a circuit breaker protection module failure signal specifically includes:

[0029] When it is detected for the first time that the sampling current does not meet the preset conditions, the sampling current is detected again after a preset review time. After repeating the detection for a preset number of times, if the sampling current still does not meet the preset conditions, a circuit breaker protection module failure signal is output.

[0030] As a further improvement to the embodiment of the present application, after the output of the circuit breaker protection module failure signal, the method further includes:

[0031] The control unit uploads the failure information and stops charging and discharging the battery.

[0032] Compared with the prior art, the beneficial effect of the present application is that the energy storage device provided by the present invention can promptly disconnect the connection circuit between the energy storage device and the external device when the main power supply of the energy storage device fails by setting a circuit breaker protection module and a detection module.

[0033] In addition, the detection device uses a normally closed switch in conjunction with the power module in the circuit breaker protection module, so that it can still perform the circuit breaker operation stably and efficiently after the main power supply of the energy storage device fails.

[0034] Furthermore, the energy storage device is also provided with a circuit breaker detection module, which can regularly detect the circuit breaker protection module to prevent it from failing.

[0035] In addition, by setting a current detection module in each battery module and cooperating with the circuit breaker protection module, the safety of the energy storage device can be improved in multiple dimensions.

[0036] As used herein, the term "comprise" and variations of the term, such as "comprises," "comprised," "comprising," "including," and "containing" do not exclude other features, components, elements, or steps unless the context clearly requires otherwise. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] FIG1 is a circuit block diagram of an energy storage device in one embodiment of the present application.

[0038] FIG2 is a circuit block diagram of a detection module and a circuit breaker protection module in one embodiment of the present application.

[0039] FIG3 is a circuit block diagram of a circuit break detection module in one embodiment of the present application.

[0040] FIG4 is a circuit block diagram of a current detection module in one embodiment of the present application.

[0041] FIG5 is a schematic diagram of the steps of a method for controlling a circuit breaker of an energy storage device in one embodiment of the present application. DETAILED DESCRIPTION

[0042] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and are not to be construed as limiting the present invention.

[0044] As shown in Figure 1, this embodiment provides an energy storage device, which includes a main circuit 2 formed by multiple battery modules 1 connected in series. The energy storage device can be connected to an external device to form a circuit. Each battery module 1 includes a battery cell 11, a control unit 12 and a switch group 13. The control unit 12 is configured to control the switch group 13 to connect a single battery module 1 in series into or bypass the main circuit 2 of the energy storage device. When a battery module 1 is bypassed, a path is formed within it to connect the front and rear battery modules 1.

[0045] In each battery module 1, the battery cell 11 can be a single battery, or can include multiple single batteries connected in series and / or in parallel, which are connected to form a battery pack to form a battery cell 11 in a basic battery module 1, and the battery cell 11 forms a positive electrode and a negative electrode.

[0046] A control unit 12 is provided in each battery module 1, that is, each battery module 1 can independently control the battery cells 11 therein. The energy storage device can be regarded as a distributed control system. When a problem occurs in a battery module 1, it is only necessary to bypass the battery module 1, and the main circuit 2 of the energy storage device remains open and can work normally.

[0047] In this embodiment, the distributed structure of the battery modules 1 enables the control unit 12 in each battery module 1 to function as a master control unit 12 and send signals to other control units 12 for communication control. In other embodiments of the present invention, a master control unit may be separately provided in the energy storage module main circuit 2 to control the control units 12 in other battery modules 1.

[0048] The switch group 13 can be two switches or a single-pole double-throw switch, etc. In this embodiment, the switch group 13 includes a first switch 13a and a second switch 13b. The battery cell 11 is connected in series with the first switch 13a, and the battery cell 11 and the first switch 13a are connected in series with the second switch 13b. The control unit 12 determines whether to connect the battery cell 11 to or disconnect the battery cell 11 from the main circuit 2 of the energy storage device according to the status of the battery cell 11. When the battery cell 11 needs to be connected in series, the first switch 13a is closed and the second switch 13b is opened. When the battery cell 11 needs to be bypassed, the first switch 13a is opened and the second switch 13b is closed. The control unit 12 can determine the status of the battery cell 11 based on the voltage and / or charge state of the battery cell 11. The specific control strategy can be set according to the application scenario.

[0049] Furthermore, the energy storage device is also provided with a detection module 3, a circuit breaker protection module 4 connected in series with the main circuit 2 of the energy storage device, and a circuit breaker detection module 6.

[0050] Detection module 3 is configured to monitor the operating status of the energy storage device and, upon detecting a failure of the energy storage device, activate circuit breaker module 4. Circuit breaker module 4 is configured to output a circuit breaker drive power supply upon activation. This circuit breaker drive power supply then disconnects circuit breaker 7 in the energy storage device's main circuit 2, severing the connection between the energy storage device and external devices. Detection module 3 and circuit breaker module 4 work together to disconnect the energy storage device from external devices if the energy storage device's main power supply fails, or is suspected of failing. This prevents the circuit breaker 7 from being forcibly closed due to a main power failure, thereby protecting the battery from overcharging.

[0051] The circuit breaker detection module 6 is configured to periodically sample the current of the circuit breaker protection module 4 and output a shunt failure signal if the sampled current does not meet preset conditions. By providing an additional detection module to the circuit breaker protection module 4, it is ensured that the circuit breaker protection module 4 will not fail during use of the energy storage device, further improving the safety of the energy storage device.

[0052] In this embodiment, the circuit breaker 7 is an air switch. In other embodiments of the present invention, the circuit breaker 7 may also be a vacuum circuit breaker or a gas circuit breaker.

[0053] As shown in Figure 2, in this embodiment, the detection module 3 includes a normally closed switch module 3a connected in series with the circuit breaker protection module 4. The normally closed switch module 3a includes a normally closed switch 31 and a normally closed switch control circuit 32 connected to the normally closed switch 31. The contacts of the normally closed switch 31 in the open state are normally open contacts, and the contacts in the closed state are normally closed contacts. The normally closed switch control circuit 32 controls the normally closed switch 31. The normally closed switch module 3a is configured to determine that the energy storage device has failed upon loss of a signal from the control unit 12 or upon receipt of a corresponding signal from the control unit 12, thereby conducting the normally closed switch 31.

[0054] Specifically, in this embodiment, the failure of the main power supply of the energy storage device mainly includes the following three situations:

[0055] 1. When the circuit breaker 7 in the main circuit 2 of the energy storage device is in a closed state and it is detected that the main power supply voltage of the energy storage device does not meet the preset range, the control unit 12 of the energy storage device cannot operate.

[0056] 2. When the instruction to disconnect the circuit breaker 7 needs to be executed and the circuit breaker 7 fails to disconnect, it is determined that the driving voltage of the main power circuit breaker 7 of the energy storage device fails, and the control signal of the control unit 12 needs to be set low.

[0057] 3. During the operation of the board, when the control unit 12 is reset, there is no signal at the input / output port.

[0058] When one of the above three situations occurs, that is, when there is no signal from the control unit 12 in the energy storage device circuit or the control signal of the control unit 12 is set to low, the detection module 3 set with the normally closed switch 31 will be turned on, thereby turning on the circuit breaker protection module 4 to enable the circuit breaker drive power supply to control the circuit breaker 7, thereby avoiding the inability to open the circuit breaker 7 due to failure of the control unit 12. In other embodiments of the present invention, when there is a situation where there is no signal from other control units 12, it can also be determined that the circuit breaker protection module 4 needs to be started. By using the normally closed switch 31 to constitute the detection module 3 and control the circuit breaker protection module 4, the circuit breaker 7 can still be stably and effectively disconnected after the energy storage device control unit 12 fails, thereby protecting the energy storage device.

[0059] Furthermore, the circuit breaker protection module 4 includes a power supply module 41 and a shunt release 42. The input end of the power supply module 41 is connected to the main circuit 2 of the energy storage circuit, the output end of the power supply module 41 is connected to the shunt release 42, and a normally closed switch module 3a is connected between the input end of the power supply module 41 and the negative pole of the main circuit 2 of the energy storage circuit.

[0060] Specifically, in this embodiment, the power module 41 is a DC-DC isolated power module. After the normally closed switch 31 is turned on, the voltage between the main circuit 2 of the energy storage device is reduced to the voltage required to drive the circuit breaker protection module 4 through the transformer of the power module 41, and then used as a circuit breaker driving power supply.

[0061] Furthermore, the circuit breaker protection module 4 also includes a power output switch module 43, which includes a power output switch 431 and a power output switch control circuit 432 connected to the power output switch 431. The power output switch module 43 is configured to close the power output switch 431 when the power module 41 outputs the circuit breaker drive power, so that the circuit breaker drive power reaches the shunt release 42, causing the shunt release 42 coil to generate current and energy, and then the shunt release 42 and the circuit breaker 7 are tripped and disconnected.

[0062] Furthermore, the circuit breaker protection module 4 also includes a timing circuit 44 connected in series with the power output switch control circuit 432. The timing circuit 44 is configured to output a closing signal at a fixed time after power is supplied by the circuit breaker drive power supply. The power output switch module 43 is configured to drive the power output switch 431 to close after receiving the closing signal. After a delay, the timing circuit 44 outputs a closing signal to the power output switch control circuit 432 to ensure that the energy storage capacitor of the shunt drive is fully charged. The specific timing can be adjusted according to the actual product specifications.

[0063] The above-described detection module 3 and circuit breaker protection module 4 effectively disconnect the connection between the energy storage device and external devices upon failure of the energy storage device's main power supply, preventing the external charging and discharging equipment from continuing to charge the battery and causing overcharging. Furthermore, even after failure of the control unit 12, this embodiment utilizes the normally closed switch 31 to maintain a stable output of circuit breaker drive power to drive the shunt release 42 to open the circuit breaker 7, further improving the safety and reliability of the energy storage device.

[0064] As shown in FIG3 , in this embodiment, the circuit break detection module 6 includes a shunt drive power supply 61, a shunt sampling resistor 62 connected in series with the shunt release 41, a shunt comparator 63 provided on the side of the shunt sampling resistor 62, and a shunt detection control unit 64. The shunt comparator 63 and the shunt detection control unit 64 are configured to output a shunt failure signal to the shunt detection control unit 64 when detecting that the voltage on the side of the shunt sampling resistor 62 exceeds a preset voltage.

[0065] Since shunt trip 41 is effectively equivalent to a superposition of inductance and resistance, after the driving power reaches the coil of shunt trip 41, the current in the coil exhibits a linear upward trend. Shunt trip 41 will only trip when the accumulated energy in the coil reaches a certain level. Therefore, by controlling the sampling current, the sampling current can be controlled so that it can perform a detection function without causing the shunt trip 41 to operate. For example, in this embodiment, the sampling current is controlled to less than 0.5A.

[0066] Furthermore, in this embodiment, the discrete drive signal is set to a PWM square wave. Exemplarily, the PWM square wave period is 380us, the duty cycle is 19%, and the default detection is to continuously send a square wave of 5 cycles (a total of 2ms). During the operation of the energy storage device, a detection is performed every 30 minutes, and the detection logic signal is set to trigger an interrupt on the falling edge. Once the MCU detects the falling edge, it immediately stops sending the PWM wave and determines that the loop is valid. During the detection process, when the shunt detection control unit 64 does not receive the falling edge of the detection signal, it will send it again after 500ms. If the falling edge signal is still not received after 4 consecutive detections, it is determined that the detection loop has failed. In other embodiments of the present invention, the above parameters can be adaptively modified and adjusted according to product specifications and application scenarios.

[0067] When the shunt release 41 is detected to be faulty, the shunt detection control unit 64 uploads the fault information, stops charging and discharging the battery, and waits for professionals to inspect and repair the energy storage device.

[0068] As shown in FIG4 , in this embodiment, each battery module 1 further includes a current detection module 5 , which is connected in series with the battery and switch group 13 . Upon detecting an overcurrent condition in the battery module 1 , the current detection module 5 is configured to control the switch group 13 to bypass the battery module 1 from the energy storage device main circuit 2 . In this embodiment, this involves opening the first switch 13 a and closing the second switch 13 b .

[0069] Specifically, the current detection module 5 includes a shunt resistor 51 connected in series with the battery and the switch group 13, as well as a current detection amplifier 52 and a high-speed comparator 53 located on the side of the shunt resistor 51. The control unit 12 is configured to drive the switch group 13 to bypass the battery module 1 from the main circuit 2 of the energy storage device when it detects that the voltage across the shunt resistor 51 exceeds a preset threshold. The current detection amplifier 52 and the high-speed comparator 53 can measure the voltage across the shunt resistor 51 with high precision and compare it with a preset voltage threshold. When the voltage across the shunt resistor 51 does not exceed the voltage threshold, the output signal is set high and does not affect the closing and closing of the switch group 13; when the voltage across the shunt resistor 51 exceeds the voltage threshold, the output signal is set low, and the switch group 13 control circuit does not output a drive signal.

[0070] Furthermore, in this embodiment, the switch group 13 uses MOSFET devices, combined with the current detection module 5, the response speed of current detection is greatly improved, and it can quickly identify current climbing and effectively distinguish between short-circuit large current and normal large current, thereby improving the reliability of overcurrent protection action execution and reducing design costs.

[0071] The provision of current detection module 5 effectively provides overcurrent protection for individual battery modules 1. In the event of an external short circuit, battery cell 11 is bypassed, entering a charge-discharge-prohibited state to protect battery cell 11. The provision of circuit breaker protection module 4 and current detection module 5 protects the energy storage device as a whole and the individual battery modules 1, respectively, thereby improving the safety of the energy storage device in multiple dimensions.

[0072] As shown in FIG5 , this embodiment further provides a method for controlling circuit breaker of the energy storage device, which includes the following steps:

[0073] S1: regularly sampling current detection of the circuit breaker protection module 4. When the sampling current does not meet the preset conditions, a failure signal of the circuit breaker protection module 4 is output; when the sampling current meets the preset conditions, the main power supply of the energy storage device is detected.

[0074] S2: When the main power supply of the energy storage device is detected to be faulty, the power supply module 41 is turned on to output the circuit-breaking driving power supply.

[0075] S3: The circuit breaker driving power supply supplies power to the shunt release 42, and the shunt release 42 works to disconnect the circuit breaker 7 in the main circuit of the energy storage device.

[0076] In step S1, it specifically includes:

[0077] When it is detected for the first time that the sampling current does not meet the preset conditions, the sampling current is detected again after a preset review time. After repeating the detection for a preset number of times, if the sampling current still does not meet the preset conditions, a circuit breaker protection module failure signal is output.

[0078] When the failure of the shunt release 41 is detected, the control unit uploads the failure information, stops charging and discharging the battery, and waits for professionals to repair the energy storage device.

[0079] In step S2, it specifically includes:

[0080] When the circuit breaker 7 is closed and it is detected that the voltage of the main power supply of the energy storage device does not meet the preset range, the normally closed switch 31 is turned on and the circuit breaker driving power is output through the power module 41. Or

[0081] Alternatively, when the instruction to disconnect the circuit breaker 7 needs to be executed and the circuit breaker 7 fails to disconnect, the normally closed switch 31 is turned on and the circuit breaker driving power is output through the power module 41.

[0082] Alternatively, when the control unit 12 is reset and there is no signal at the input / output port, the normally closed switch 31 is turned on and the circuit-breaking driving power is output through the power module 41 .

[0083] In step S3, it specifically includes:

[0084] The circuit breaker driving power supply supplies power to the timing circuit 44. After a delay of a period of time, the timing circuit 44 outputs a closing signal to the power output switch control circuit 432. The power output switch control circuit 432 drives the power output switch 431 to close, and the shunt release 42 obtains power to disconnect the circuit breaker 7.

[0085] In summary, the energy storage device provided in this embodiment can disconnect the connection circuit between the energy storage device and the external device in a timely manner when the main power supply of the energy storage device fails by providing a circuit breaker protection module and a detection module. In addition, the detection device can stably and efficiently perform the circuit breaker operation even after the main power supply of the energy storage device fails by using a normally closed switch in conjunction with the power module in the circuit breaker protection module. Furthermore, the energy storage device is also provided with a circuit breaker detection module, which can regularly detect the circuit breaker protection module to prevent it from failing. In addition, by providing a current detection module in each battery module, in conjunction with the circuit breaker protection module, the safety of the energy storage device can be improved in multiple dimensions.

[0086] It should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation method can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0087] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention and are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. An energy storage device, characterized in that: The energy storage device comprises a main circuit formed by connecting a plurality of battery modules in series in sequence, and the energy storage device can be connected to an external device to form a circuit. Each of the battery modules comprises a battery unit, a control unit and a switch group. The control unit is configured to control the switch group to connect a single battery module in series into or bypass the main circuit of the energy storage device, and when a battery module is bypassed, a passage connecting the front and rear battery modules is formed in the battery module; The energy storage device is also provided with a detection module, a circuit breaker detection module connected in series with the main circuit of the energy storage device, and a circuit breaker protection module; The circuit breaker detection module is configured to periodically perform sampling current detection on the circuit breaker protection module, and output a shunt failure signal when the sampling current does not meet a preset condition. The detection module is configured to detect the working state of the energy storage device. When the circuit breaker detection module detects that the sampling current meets the preset condition, the detection module is configured to turn on the circuit breaker protection module when detecting that the energy storage device fails; The circuit breaker protection module is configured to output a circuit breaker driving power supply after being turned on, and drive the circuit breaker in the main circuit of the energy storage device to disconnect the connection circuit between the energy storage device and the external device through the circuit breaker driving power supply; 2. The energy storage device according to claim 1, characterized in that: The detection module includes a normally closed switch module connected in series with the circuit breaker protection module, the normally closed switch module includes a normally closed switch and a normally closed switch control circuit connected to the normally closed switch, and the normally closed switch module is configured to determine that the energy storage device has failed and conduct the normally closed switch after losing a control unit signal or receiving a corresponding control unit signal.

3. The energy storage device according to claim 2, characterized in that: The circuit breaker protection module also includes a power supply module and a shunt release, the input end of the power supply module is connected to the main circuit of the energy storage circuit, the output end of the power supply module is connected to the shunt release, and the normally closed switch module is connected between the input end of the power supply module and the negative pole of the main circuit of the energy storage circuit.

4. The energy storage device according to claim 3, characterized in that: The circuit breaking detection module includes a shunt driving power supply, a shunt sampling resistor connected in series with the shunt releaser, a comparator arranged on the side of the shunt sampling resistor, and a shunt detection control unit. The comparator and the shunt detection control unit are configured to output a shunt failure signal to the shunt detection control unit when detecting that the voltage on the side of the shunt sampling resistor exceeds a preset voltage.

5. The energy storage device according to claim 4, characterized in that: The shunt detection control unit is configured to detect the sampling current at a regular interval and detect and output a PWM square wave shunt drive signal.

6. The energy storage device according to claim 4, characterized in that: The shunt detection control unit is configured to detect the sampling current again after a preset review time when it is detected for the first time that the sampling current does not meet the preset condition. After repeating the detection for a preset number of times, if the sampling current still does not meet the preset condition, output a circuit breaker protection module failure signal.

7. The energy storage device according to claim 3, characterized in that: The circuit breaker protection module includes a power output switch module, which includes a power output switch and a power output switch control circuit connected to the power output switch. The power output switch module is configured to close the power output switch when the power module outputs the circuit breaker driving power, so that the circuit breaker driving power reaches the shunt release, and drives the shunt release to disconnect the circuit breaker.

8. The energy storage device according to claim 4, characterized in that: The circuit breaker protection module also includes a timing circuit connected in series with the power output switch control circuit, and the timing circuit is configured to output a closing signal at a fixed time after power is supplied by the circuit breaker driving power supply. The power output switch module is configured to drive the power output switch to close after receiving the closing signal.

9. The energy storage device according to claim 1, characterized in that: Each of the battery modules also includes a current detection module, which is connected in series with the battery and the switch group. When the current detection module detects that the battery module is in an overcurrent state, it is configured to control the switch group to bypass the battery module out of the main circuit of the energy storage device.

10. The energy storage device according to claim 9, characterized in that: The current detection module includes a shunt resistor connected in series with the battery and the switch group, and a current detection amplifier and a high-speed comparator located on the side of the shunt resistor. The control unit is configured to drive the switch group to bypass the battery module out of the main circuit of the energy storage device when it is detected that the voltage across the shunt resistor exceeds a preset threshold.

11. A method for controlling circuit breaker of an energy storage device according to any one of claims 1 to 10, characterized in that: Includes steps: The circuit breaker protection module is sampled and tested regularly. When the sampled current does not meet the preset conditions, a circuit breaker protection module failure signal is output; when the sampled current meets the preset conditions, the main power supply of the energy storage device is tested; When the main power supply of the energy storage device fails, the power supply module is turned on to output the circuit-breaking driving power supply; The circuit breaker driving power supply supplies power to the shunt release, and the shunt release works to disconnect the circuit breaker in the main circuit of the energy storage device.

12. The energy storage device disconnection control method according to claim 11, characterized in that: When the main power supply of the energy storage device fails, the power supply module is turned on to output the circuit-breaking driving power supply, which specifically includes: When the circuit breaker is closed and it is detected that the main power supply voltage of the energy storage device does not meet the preset range, the normally closed switch is turned on and the circuit breaker driving power is output through the power module.

13. The energy storage device disconnection control method according to claim 11, characterized in that: When the main power supply of the energy storage device fails, the power supply module is turned on to output the circuit-breaking driving power supply, which specifically includes: When the circuit breaker disconnection instruction needs to be executed and the circuit breaker disconnection fails, the normally closed switch is turned on and the circuit breaker driving power is output through the power module.

14. The energy storage device disconnection control method according to claim 11, characterized in that: When the main power supply of the energy storage device fails, the power supply module is turned on to output the circuit-breaking driving power supply, which specifically includes: When the control unit is reset and there is no signal at the input / output port, the normally closed switch is turned on and the drive power is disconnected through the power module output.

15. The energy storage device circuit breaker control method according to claim 11, characterized in that: When the sampled current does not meet the preset condition, outputting a circuit breaker protection module failure signal specifically includes: When it is detected for the first time that the sampling current does not meet the preset conditions, the sampling current is detected again after a preset review time. After repeating the detection for a preset number of times, if the sampling current still does not meet the preset conditions, a circuit breaker protection module failure signal is output.

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