Management system of sodium salt battery

Abstract

The utility model belongs to the technical field of sodium salt battery management, and relates to a sodium salt battery management system, in which ADC analog-to-digital converters A and B are respectively connected to an SPI data transmission interface of a micro-control unit MCU through digital isolation chips A and B; a high-side driven relay is used as a switch of a main loop; the balance control interface is a DO (Digital Output) interface and is connected with an IO (Input / Output) control port of the MCU; the RTD temperature measurement interface is connected to an SPI data transmission interface of the MCU through an ADC analog-to-digital converter D; the RS485 communication circuit is connected to a serial port data transmission interface of the MCU through a digital isolation chip C; the CAN serial communication bus is connected to a CAN communication interface of the MCU through the digital isolation chip; according to the utility model, the sodium salt battery management system cannot be interfered by external interference.

Description

Technical Field

[0001] The utility model belongs to the technical field of sodium salt battery management, and in particular relates to a management system for sodium salt batteries. Background Art

[0002] Sodium salt batteries are high-energy batteries composed of a sodium ion-conducting β″-Al2O3 solid electrolyte. They have the advantages of high open-circuit voltage, high specific energy, high specific power, high energy conversion efficiency, capacity independent of discharge rate, fast charging, maintenance-free, simple manufacturing process, resistance to overcharge and over-discharge, resistance to cold and hot cycles, and high safety. As a power battery, they are being promoted and applied in automobiles and underwater vehicles.

[0003] Sodium salt batteries need to maintain a temperature of around 300°C during operation, and it takes 12h to 15h to start a hot and cold cycle. In addition, the battery needs to maintain a heat loss of 90W when not working. After normal operation, the sodium salt battery pack can be powered by the battery itself to keep warm, and it is necessary to control the switching of internal and external heating power sources. The sodium salt battery pack allows a single cell to continue to operate after failure, but the battery status must be monitored, fault diagnosis and protection must be carried out. The sodium salt battery pack needs to be managed by a monitoring system, and real-time communication is required to transmit status data and control instructions. Therefore, the sodium salt battery pack needs to be equipped with a specific battery management system to meet the above-mentioned multiple functional requirements, but the battery management systems currently on the market do not meet the requirements of the sodium salt battery pack. In order to meet the requirements of sodium salt batteries for temperature control, parameter acquisition, system control, etc., the utility model proposes a sodium salt battery management system and control method, which can provide stable and reliable temperature control and charge and discharge status management for sodium salt batteries. Summary of the Invention

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a management system for sodium salt batteries.

[0005] In order to achieve the purpose of the utility model, the utility model will be implemented by adopting the following technical solutions.

[0006] A sodium salt battery management system includes a microcontroller unit (MCU), an analog-to-digital converter (ADC), a battery voltage information acquisition interface, an insulation detection interface, a main circuit charge and discharge interface, an NTC temperature detection circuit, an RS485 communication interface, a CAN serial communication bus interface, a Hall current acquisition interface, and a heating control interface, wherein:

[0007] The battery voltage information acquisition interface is connected to an ADC analog-to-digital converter A via a solid-state relay, and the ADC analog-to-digital converter A is connected to an SPI data transmission interface of the microcontroller unit MCU;

[0008] The insulation detection interface is connected to an ADC analog-to-digital converter B via a solid-state relay, and the ADC analog-to-digital converter B is connected to an SPI data transmission interface of the microcontroller unit MCU;

[0009] The main circuit charge and discharge interface is connected to the SPI data transmission interface of the micro control unit MCU through the main circuit;

[0010] The Hall current acquisition interface is connected to the ADC analog-to-digital converter C through a resistor R1, and the ADC analog-to-digital converter C is connected to the serial data transmission interface of the microcontroller unit MCU; the Hall current acquisition interface is connected to a Hall sensor, and the Hall sensor is used to detect the charge and discharge current of the main circuit;

[0011] The NTC temperature detection circuit is connected to the SPI data transmission interface of the microcontroller unit MCU through the ADC analog-to-digital converter D;

[0012] The RS485 communication interface is connected to the serial data transmission interface of the micro control unit MCU through the RS485 communication circuit;

[0013] The CAN serial communication bus interface is connected to the CAN communication interface of the micro control unit MCU via the CAN serial communication bus;

[0014] The heating control interface is a DO digital output interface, which is connected to the IO control port of the microcontroller unit MCU and is used to control the heating operation of the battery pack;

[0015] The ADC analog-to-digital converter A is connected to the SPI data transmission interface of the microcontroller unit MCU through a digital isolation chip A;

[0016] The ADC analog-to-digital converter B is connected to the SPI data transmission interface of the microcontroller unit MCU through a digital isolation chip B;

[0017] The main circuit uses a high-side driven relay as a switch of the main circuit;

[0018] The system also includes a balance control interface and an RTD temperature measurement interface, wherein the balance control interface is a DO digital output interface connected to the IO control port of the microcontroller unit MCU;

[0019] The RTD temperature measurement interface is connected to the SPI data transmission interface of the microcontroller unit MCU through the ADC analog-to-digital converter D;

[0020] The RS485 communication circuit is connected to the serial data transmission interface of the micro control unit MCU through a digital isolation chip C;

[0021] The CAN serial communication bus is connected to the CAN communication interface of the microcontroller unit MCU through a digital isolation chip.

[0022] As a preferred solution of the present invention, the connection line between the resistor R1 and the ADC analog-to-digital converter C is connected to the ground GND through the resistor R2.

[0023] As a preferred solution of the present invention, the insulation detection interface includes three insulation detection interfaces: one insulation detection interface collects the total positive voltage of the battery pack, one insulation detection interface is connected to the outer shell of the battery pack, and one insulation detection interface collects the total negative voltage of the battery pack.

[0024] As a preferred solution of the present invention, the NTC temperature detection circuit is used to detect the temperature of the battery pack and collect the temperature of the battery pack.

[0025] As a preferred solution of the present utility model, the battery voltage information acquisition interface includes six string voltage acquisition interfaces and one total voltage acquisition interface.

[0026] As a preferred solution of the present invention, the balancing control interface is connected to the charger and the load, and is used to control the charger and the load to stop working when the system crashes. Beneficial effects

[0027] Compared with the existing technology, the beneficial effect of the present invention is that the number of current battery failures can be determined based on the string voltage, which is beneficial to the maintenance of the battery pack.

[0028] The utility model isolates the total pressure and the single cell, prohibits measurement before the battery is formed, and can close the collection loop only after formation;

[0029] The utility model detects the temperature of the battery pack in real time, ensuring that the battery pack will not experience thermal runaway;

[0030] The utility model isolates the communication with the outside world so that the interference of the external circuit will not interfere with the sodium salt battery management system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A circuit diagram of a management system for a sodium salt battery;

[0032] Figure 2 A diagram showing the connection between the battery voltage information acquisition interface and the MCU;

[0033] Figure 3 A diagram showing the connection between the insulation detection interface and the MCU;

[0034] Figure 4A diagram showing the connection between the main circuit charging and discharging interface and the MCU;

[0035] Figure 5 A diagram showing the connection between the DI / DO interface and the MCU;

[0036] Figure 6 It is a connection diagram between the NTC temperature detection circuit and the MCU;

[0037] Figure 7 This is a connection diagram between the RS485 / CAN interface and the MCU. DETAILED DESCRIPTION

[0038] The following will be combined with the embodiments of the present invention and the accompanying drawings to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. 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.

[0039] As an embodiment of the present utility model, Figures 1 to 7 As shown, a sodium salt battery management system includes a microcontroller unit MCU, an ADC analog-to-digital converter 1, a battery voltage information acquisition interface, an insulation detection interface, a main circuit charge and discharge interface, an NTC temperature detection circuit, an RS485 communication interface, a CAN serial communication bus interface, a Hall current acquisition interface, and a heating control interface, wherein:

[0040] The battery voltage information acquisition interface is connected to an ADC analog-to-digital converter A via a solid-state relay, and the ADC analog-to-digital converter A is connected to an SPI data transmission interface of the microcontroller unit MCU;

[0041] The insulation detection interface is connected to an ADC analog-to-digital converter B via a solid-state relay, and the ADC analog-to-digital converter B is connected to an SPI data transmission interface of the microcontroller unit MCU;

[0042] The main circuit charge and discharge interface is connected to the SPI data transmission interface of the micro control unit MCU through the main circuit;

[0043] The Hall current acquisition interface is connected to the ADC analog-to-digital converter C through a resistor R1, and the ADC analog-to-digital converter C is connected to the serial data transmission interface of the microcontroller unit MCU; the Hall current acquisition interface is connected to a Hall sensor, and the Hall sensor is used to detect the charge and discharge current of the main circuit;

[0044] The NTC temperature detection circuit is connected to the SPI data transmission interface of the microcontroller unit MCU through the ADC analog-to-digital converter D;

[0045] The RS485 communication interface is connected to the serial data transmission interface of the micro control unit MCU through the RS485 communication circuit;

[0046] The CAN serial communication bus interface is connected to the CAN communication interface of the micro control unit MCU via the CAN serial communication bus;

[0047] The heating control interface is a DO digital output interface, which is connected to the IO control port of the microcontroller unit MCU and is used to control the heating operation of the battery pack;

[0048] The ADC analog-to-digital converter A is connected to the SPI data transmission interface of the microcontroller unit MCU through a digital isolation chip A;

[0049] The ADC analog-to-digital converter B is connected to the SPI data transmission interface of the microcontroller unit MCU through a digital isolation chip B;

[0050] The main circuit uses a high-side driven relay as a switch of the main circuit;

[0051] The system also includes a balance control interface and an RTD temperature measurement interface, wherein the balance control interface is a DO digital output interface connected to the IO control port of the microcontroller unit MCU;

[0052] The RTD temperature measurement interface is connected to the SPI data transmission interface of the microcontroller unit MCU through the ADC analog-to-digital converter D;

[0053] The RS485 communication circuit is connected to the serial data transmission interface of the micro control unit MCU through a digital isolation chip C;

[0054] The CAN serial communication bus is connected to the CAN communication interface of the micro control unit MCU through a digital isolation chip.

[0055] As an embodiment of the present utility model, Figure 1 and Figure 4 As shown, the connection line between the resistor R1 and the ADC analog-to-digital converter C is connected to the ground GND through the resistor R2.

[0056] As an embodiment of the present utility model, Figure 1 and Figure 3 As shown, the insulation detection interface includes three insulation detection interfaces: one insulation detection interface collects the total positive voltage of the battery pack, one insulation detection interface is connected to the outer shell of the battery pack, and one insulation detection interface collects the total negative voltage of the battery pack.

[0057] As an embodiment of the present utility model, Figure 1 and Figure 6 As shown, the NTC temperature detection circuit adopts a transistor drive circuit, a relay drive circuit or a solid-state relay drive circuit to detect the temperature of the battery pack and collect the temperature of the battery pack.

[0058] As an embodiment of the present utility model, Figure 1 and Figure 2 As shown, the battery voltage information acquisition interface includes six string voltage acquisition interfaces and one total voltage acquisition interface.

[0059] As an embodiment of the present utility model, Figure 1 and Figure 5 As shown, the balancing control interface is connected to the charger and the load, and is used to control the charger and the load to stop working when the system crashes.

[0060] The DI interface is a dry contact input signal. The sodium salt battery management system uses DI to quickly communicate with external control devices, such as generators and chargers. It is primarily used for emergency shutdown of equipment. Receiving a DI signal indicates a possible external device failure.

[0061] The technical solution of the present invention is described in detail above in conjunction with the embodiments / drawings, but the present invention is not limited to the above technical solution. For ordinary technicians in this technical field, after knowing the contents recorded in the present invention, they can make several equivalent changes and substitutions without departing from the principles of the present invention. These equivalent changes and substitutions should also be regarded as belonging to the scope of protection of the present invention.

Claims

1. A sodium salt battery management system, comprising a microcontroller unit (MCU), an ADC (analog-to-digital converter), a battery voltage information acquisition interface, an insulation detection interface, a main circuit charge and discharge interface, an NTC temperature detection circuit, an RS485 communication interface, a CAN serial communication bus interface, a Hall current acquisition interface, and a heating control interface, wherein: The battery voltage information acquisition interface is connected to an ADC analog-to-digital converter A via a solid-state relay, and the ADC analog-to-digital converter A is connected to an SPI data transmission interface of the microcontroller unit MCU; The insulation detection interface is connected to an ADC analog-to-digital converter B via a solid-state relay, and the ADC analog-to-digital converter B is connected to an SPI data transmission interface of the microcontroller unit MCU; The main circuit charge and discharge interface is connected to the SPI data transmission interface of the micro control unit MCU through the main circuit; The Hall current acquisition interface is connected to the ADC analog-to-digital converter C through a resistor R1, and the ADC analog-to-digital converter C is connected to the serial data transmission interface of the microcontroller unit MCU; the Hall current acquisition interface is connected to a Hall sensor, and the Hall sensor is used to detect the charge and discharge current of the main circuit; The NTC temperature detection circuit is connected to the SPI data transmission interface of the microcontroller unit MCU through the ADC analog-to-digital converter D; The RS485 communication interface is connected to the serial data transmission interface of the micro control unit MCU through the RS485 communication circuit; The CAN serial communication bus interface is connected to the CAN communication interface of the micro control unit MCU via the CAN serial communication bus; The heating control interface is a DO digital output interface, which is connected to the IO control port of the microcontroller unit MCU and is used to control the heating work of the battery pack; Its characteristics are: The ADC analog-to-digital converter A is connected to the SPI data transmission interface of the microcontroller unit MCU through a digital isolation chip A; The ADC analog-to-digital converter B is connected to the SPI data transmission interface of the microcontroller unit MCU through a digital isolation chip B; The main circuit uses a high-side driven relay as a switch of the main circuit; The system also includes a balance control interface and an RTD temperature measurement interface, wherein the balance control interface is a DO digital output interface connected to the IO control port of the microcontroller unit MCU; The RTD temperature measurement interface is connected to the SPI data transmission interface of the microcontroller unit MCU through the ADC analog-to-digital converter D; The RS485 communication circuit is connected to the serial data transmission interface of the micro control unit MCU through a digital isolation chip C; The CAN serial communication bus is connected to the CAN communication interface of the microcontroller unit MCU through a digital isolation chip.

2. A sodium salt battery management system according to claim 1, characterized in that: The connection line between the resistor R1 and the ADC analog-to-digital converter C is connected to the ground GND through the resistor R2.

3. The sodium salt battery management system according to claim 1, characterized in that: The insulation detection interface includes three insulation detection interfaces: one insulation detection interface collects the total positive voltage of the battery pack, one insulation detection interface is connected to the shell of the battery pack, and one insulation detection interface collects the total negative voltage of the battery pack.

4. The sodium salt battery management system according to claim 1, characterized in that: The NTC temperature detection circuit is used to detect the temperature of the battery pack and collect the temperature of the battery pack.

5. The sodium salt battery management system according to claim 1, characterized in that: The battery voltage information acquisition interface includes six string voltage acquisition interfaces and one total voltage acquisition interface.

6. The sodium salt battery management system according to claim 1, characterized in that: The balancing control interface is connected to the charger and the load, and is used to control the charger and the load to stop working when the system crashes.

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