External safety detection device for SOC (State of Charge) of energy storage battery
By monitoring the voltage and current signals of the energy storage battery through external voltage sensors and current sensors, combined with the processing of the main control module and the self-learning attack detection algorithm, the problem of the energy storage battery SOC estimation being vulnerable to attacks is solved, and the accuracy and security of the data are achieved.
Patent Information
- Application Number
- CN202422791354.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-15
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2034-11-15
AI Technical Summary
Existing energy storage battery SOC estimation is vulnerable to cyber or physical attacks, resulting in inaccurate voltage signals and SOC output values, which may cause incorrect working state control.
External voltage sensors and current sensors are used to monitor the battery voltage and current signals respectively, and the signals are processed by the main control module and transmitted to the BMS main control layer. The main control module has built-in SOC estimation algorithm and self-learning attack detection algorithm to ensure data accuracy and security.
It improves the accuracy and reliability of voltage information and SOC data, reduces installation complexity and external attack risks, and ensures the safety and convenience of energy storage batteries.
Smart Images
Figure CN223413440U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of energy storage battery safety detection, in particular to an energy storage battery SOC external safety detection device. Background Art
[0002] SOC (State Of Charge) is the ratio of the available power in the battery to the nominal capacity. The BMS (Battery Management System) controls the working state of the energy storage battery according to the SOC value. The existing energy storage battery SOC estimation is estimated by detecting the cell voltage and combining it with the open circuit voltage and power correspondence table. The battery control chip usually contains an analog-to-digital converter, which can directly obtain the cell voltage. However, the voltage signal or SOC output value is vulnerable to attacks at the physical communication or network security level during the transmission process, causing the upper-level BMS master control to receive incorrect status information and issue incorrect instructions. For example, when the battery of the energy storage power supply has reached the full charge voltage, the main control layer receives the wrong "low power state" information and issues a charging instruction, which leads to catastrophic consequences. Utility Model Content
[0003] In order to solve the above problems, the utility model proposes an external safety detection device for energy storage battery SOC to solve the problem that voltage signals or SOC output values are easily subject to network or physical targeted attacks during transmission. It can ensure the accuracy and reliability of voltage information and SOC data, and is safer and more convenient.
[0004] The present invention provides an external safety detection device for SOC of an energy storage battery, comprising: a voltage monitoring module, a current monitoring module, a main control module and a communication module; wherein the voltage monitoring module comprises an external voltage sensor, and the current monitoring module comprises an external current sensor;
[0005] The external voltage sensor serves as the input end of the voltage monitoring module and is connected to the output end of the energy storage stack. The output end of the voltage monitoring module is connected to the receiving end of the main control module. The external current sensor serves as the input end of the current monitoring module and is connected to the output end of the energy storage stack. The output end of the current monitoring module is connected to the receiving end of the main control module. The sending end of the main control module is connected to the receiving end of the communication module. The sending end of the communication module is connected to the receiving end of the main control module. The sending end of the communication module is also used to connect to the main control layer of the battery management system on the energy storage stack.
[0006] As one of the preferred solutions, the external voltage sensor is used to be connected in parallel between the positive and negative busbars of the energy storage stack, and the external current sensor is used to be connected in series with the positive busbar of the energy storage stack.
[0007] As one preferred solution, the external voltage sensor and the external current sensor are both external snap-on sensors.
[0008] As one of the preferred solutions, the voltage monitoring module further includes a voltage signal conditioning circuit and a voltage A / D conversion circuit;
[0009] Among them, the input end of the voltage signal conditioning circuit is connected to the external voltage sensor, the output end of the voltage signal conditioning circuit is connected to the input end of the voltage A / D conversion circuit, and the output end of the voltage A / D conversion circuit is connected to the receiving end of the main control module as the output end of the voltage monitoring module.
[0010] As one of the preferred solutions, the current monitoring module further includes a current signal conditioning circuit and a current A / D conversion circuit;
[0011] Among them, the input end of the current signal conditioning circuit is connected to the external current sensor, the output end of the current signal conditioning circuit is connected to the input end of the current A / D conversion circuit, and the output end of the current A / D conversion circuit is connected to the receiving end of the main control module as the output end of the current monitoring module.
[0012] As one of the preferred solutions, the main control module is composed of an MSP430 single-chip microcomputer with a built-in SOC estimation algorithm and a self-learning attack detection algorithm.
[0013] As one of the preferred solutions, the communication module is composed of a CAN bus.
[0014] Compared with the existing technology, the voltage monitoring module and current monitoring module of the utility model use external voltage sensors and external current sensors to monitor and collect the voltage signal and current signal of the energy storage stack respectively, and then transmit the collected voltage signal and current signal to the main control module. The main control module receives and processes these signals and transmits the processing results to the energy storage stack BMS main control layer through the communication module. The external sensors used do not need to be connected to the energy storage stack circuit through wires or other wired methods, but are directly connected to the energy storage stack electrically. After the construction of the energy storage equipment is completed, there is no need to change the line, connect the power, etc., which improves the convenience and safety of installation, is not susceptible to external network or physical layer attacks, and can ensure the accuracy and reliability of voltage information and SOC data. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the technical features of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.
[0016] Figure 1 It is a structural diagram of an external safety detection device for energy storage battery SOC in one embodiment of the present utility model. DETAILED DESCRIPTION
[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.
[0018] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.
[0019] In the description of this application, it should be noted that, unless otherwise defined, all technical and scientific terms used in this utility model have the same meanings as those commonly understood by those skilled in the art. The terms used in the specification of this utility model are only for the purpose of describing specific embodiments and are not intended to limit the utility model. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood by those skilled in the art in specific circumstances.
[0020] See also Figure 1 The embodiment of the present utility model provides an external safety detection device for SOC of an energy storage battery, comprising: a voltage monitoring module 11, a current monitoring module 12, a main control module 13 and a communication module 14; wherein, the voltage monitoring module 11 includes an external voltage sensor, and the current monitoring module 12 includes an external current sensor;
[0021] The external voltage sensor serves as the input end of the voltage monitoring module 11 and is connected to the output end of the energy storage stack. The output end of the voltage monitoring module is connected to the receiving end of the main control module 13. The external current sensor serves as the input end of the current monitoring module 12 and is connected to the output end of the energy storage stack. The output end of the current monitoring module is connected to the receiving end of the main control module 13. The sending end of the main control module 13 is connected to the receiving end of the communication module 14. The sending end of the communication module 14 is connected to the receiving end of the main control module 13. The sending end of the communication module 14 is also used to connect to the main control layer of the battery management system on the energy storage stack.
[0022] It should be noted that the external voltage sensor and the external current sensor can be regarded as redundant sensors of the energy storage stack BMS, and are not susceptible to external network or physical level attacks.
[0023] In a specific implementation, the voltage and current signals of the energy storage stack are monitored and collected respectively by an external voltage sensor and an external current sensor. The collected voltage and current signals are then transmitted to the main control module 13. The main control module 13 receives and processes these signals and transmits the processing results to the energy storage stack BMS main control layer via the communication module 14. The external sensors used do not need to be connected to the energy storage stack circuit via wires or other wired means, but are directly connected to the energy storage stack electrically. After the energy storage equipment is constructed, there is no need for rewiring or power connection operations, which improves the convenience and safety of installation. It is not vulnerable to external network or physical layer attacks and can ensure the accuracy and reliability of voltage information and SOC data.
[0024] As an improvement to the above solution, the external voltage sensor is used to be connected in parallel between the positive and negative busbars of the energy storage stack, and the external current sensor is connected in series to the positive busbar of the energy storage stack.
[0025] As an improvement to the above solution, the external voltage sensor and the external current sensor are both external snap-on sensors.
[0026] In practice, the snap-on sensor design can be deployed on a wide range of energy storage devices without requiring additional circuit design. External snap-on voltage and current sensors can be used to collect voltage and current signals without requiring electrical connection to the energy storage stack, reducing the potential for attack and the number of avenues.
[0027] As an improvement to the above solution, the voltage monitoring module further includes a voltage signal conditioning circuit and a voltage A / D conversion circuit;
[0028] Among them, the input end of the voltage signal conditioning circuit is connected to the external voltage sensor, the output end of the voltage signal conditioning circuit is connected to the input end of the voltage A / D conversion circuit, and the output end of the voltage A / D conversion circuit is connected to the receiving end of the main control module 13 as the output end of the voltage monitoring module.
[0029] In a specific implementation, an external snap-on voltage sensor is connected between the positive and negative busbars of the energy storage battery stack to acquire a voltage signal. The voltage signal is conditioned by a voltage signal conditioning circuit to generate an analog voltage signal, which is transmitted to a voltage A / D conversion circuit. The voltage A / D conversion circuit converts the analog voltage signal into a digital signal and transmits it to the main control module 13. During this process, the external snap-on voltage sensor can convert a high voltage into a low voltage that can be converted to a digital signal. It can also collect voltage signals without requiring electrical connection to the energy storage battery stack, reducing the possibility and avenues of attack and providing high portability and reliability.
[0030] As an improvement to the above solution, the current monitoring module further includes a current signal conditioning circuit and a current A / D conversion circuit;
[0031] Among them, the input end of the current signal conditioning circuit is connected to the external current sensor, the output end of the current signal conditioning circuit is connected to the input end of the current A / D conversion circuit, and the output end of the current A / D conversion circuit is connected to the receiving end of the main control module 13 as the output end of the current monitoring module.
[0032] In a specific implementation, an external snap-on current sensor is connected in series to the positive and negative busbars of the energy storage battery stack to acquire a current signal. This current signal is conditioned by a current signal conditioning circuit to generate an analog current signal, which is transmitted to a current A / D conversion circuit. The current A / D conversion circuit converts the analog current signal into a digital signal and transmits it to the main control module 13. During this process, the external snap-on current sensor can convert a large current into a small current that can be converted from analog to digital. It can also collect current signals without requiring electrical connection to the energy storage battery stack, reducing the possibility and avenues of attack and providing high portability and reliability.
[0033] As an improvement of the above solution, the main control module 13 is composed of an MSP430 single chip microcomputer with a built-in SOC estimation algorithm and a self-learning attack detection algorithm.
[0034] In a specific implementation, the main control module 13 adopts an MSP430 single-chip microcomputer, which is a mixed signal processor with a sixteen-bit operation framework and a reduced instruction set. It provides high computing power while maintaining extremely low power consumption. The single-chip microcomputer has a built-in SOC estimation algorithm and a self-learning attack detection algorithm, which can automatically calculate the SOC of the energy storage stack while establishing an operating model of the protected energy storage device. Among them, the automatic calculation of the SOC of the energy storage stack is that the main control module 13 performs an SOC estimation calculation based on the Kalman filter algorithm on the output values of the voltage monitoring module 11 and the voltage monitoring module 11. The charge and discharge curve characteristics under normal operating conditions are collected through the timing method. When an attack occurs, the SOC change is compared with the charge and discharge instructions of the energy storage stack BMS main control layer to ensure that safety detection can be performed after the attack occurs. If there is a large difference in the comparison result, it means that an attack has been detected, and the main control module 13 will send an alarm message to the upper-level server through the communication module 14.
[0035] Furthermore, the main control module 13 utilizes a low-power MSP430 processing chip, which can be powered by either the device's internal battery or by access to the power supply from the power plant's weak current. This flexible and stable power supply, coupled with a long standby time, effectively ensures the operational stability and sustainability of the external security detection device. Furthermore, the attack detection algorithm employed does not require modification or integration with existing SOC estimation algorithms and can be directly incorporated into the security detection device as a software patch.
[0036] As an improvement to the above solution, the communication module 14 is composed of a CAN bus.
[0037] In a specific implementation, the communication module adopts CAN bus communication. The higher transmission speed and data volume enable the device to communicate quickly with the energy storage stack BMS main control layer, ensuring smooth operation of the system.
[0038] The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. It should be pointed out that for those skilled in the art, without departing from the technical principles of the present invention, several equivalent obvious variations and / or equivalent replacements can be made, and these obvious variations and / or equivalent replacements should also be regarded as within the scope of protection of the present invention.
Claims
1. An external safety detection device for energy storage battery SOC, characterized in that: include: A voltage monitoring module, a current monitoring module, a main control module and a communication module; wherein the voltage monitoring module includes an external voltage sensor, and the current monitoring module includes an external current sensor; The external voltage sensor serves as the input end of the voltage monitoring module and is connected to the output end of the energy storage stack. The output end of the voltage monitoring module is connected to the receiving end of the main control module. The external current sensor serves as the input end of the current monitoring module and is connected to the output end of the energy storage stack. The output end of the current monitoring module is connected to the receiving end of the main control module. The sending end of the main control module is connected to the receiving end of the communication module. The sending end of the communication module is connected to the receiving end of the main control module. The sending end of the communication module is also used to connect to the main control layer of the battery management system on the energy storage stack.
2. The energy storage battery SOC external safety detection device according to claim 1, characterized in that: The external voltage sensor is used to be connected in parallel between the positive and negative busbars of the energy storage stack, and the external current sensor is used to be connected in series to the positive busbar of the energy storage stack.
3. The energy storage battery SOC external safety detection device according to any one of claims 1 to 2, characterized in that: The external voltage sensor and the external current sensor are both external snap-on sensors.
4. The energy storage battery SOC external safety detection device according to claim 3, characterized in that: The voltage monitoring module also includes a voltage signal conditioning circuit and a voltage A / D conversion circuit; Among them, the input end of the voltage signal conditioning circuit is connected to the external voltage sensor, the output end of the voltage signal conditioning circuit is connected to the input end of the voltage A / D conversion circuit, and the output end of the voltage A / D conversion circuit is connected to the receiving end of the main control module as the output end of the voltage monitoring module.
5. The energy storage battery SOC external safety detection device according to claim 3, characterized in that: The current monitoring module also includes a current signal conditioning circuit and a current A / D conversion circuit; Among them, the input end of the current signal conditioning circuit is connected to the external current sensor, the output end of the current signal conditioning circuit is connected to the input end of the current A / D conversion circuit, and the output end of the current A / D conversion circuit is connected to the receiving end of the main control module as the output end of the current monitoring module.
6. The energy storage battery SOC external safety detection device according to claim 1, characterized in that: The main control module is composed of an MSP430 single chip microcomputer with built-in SOC estimation algorithm and self-learning attack detection algorithm.
7. The energy storage battery SOC external safety detection device according to claim 1, characterized in that: The communication module is composed of a CAN bus.