A sodium-ion battery device and energy storage equipment

Abstract

This invention discloses a sodium-ion battery device and an energy storage device. The sodium-ion battery device includes a sodium-ion battery pack, a battery management system, a voltage conversion module, and a backup power supply module. The voltage conversion module is electrically connected to the sodium-ion battery pack, the battery management system, and the backup power supply module. The backup power supply module is also electrically connected to the battery management system, and the battery management system is also electrically connected to the sodium-ion battery pack. The voltage conversion module converts the voltage signal provided by the sodium-ion battery pack into the power supply voltage required by the battery management system. The battery management system is configured to: acquire the current voltage of the sodium-ion battery pack and the output voltage of the voltage conversion module; and control the voltage conversion module or the backup power supply module to supply power to the battery management system based on the current voltage and the output voltage. The technical solution of this invention improves the operational reliability and responsiveness of the sodium-ion battery device.

Description

Technical Field

[0001] This invention relates to the field of energy storage technology, and in particular to a sodium-ion battery device and energy storage equipment. Background Technology

[0002] Compared with lithium-ion batteries, sodium-ion batteries have the following advantages: (1) cheaper materials; (2) better high and low temperature performance; (3) better safety performance; and (4) can discharge to 0V.

[0003] Sodium-ion batteries can discharge to 0V, which solves transportation safety issues. However, when the voltage of the entire sodium-ion battery pack drops to an extremely low level of 0V, the sodium-ion battery pack cannot supply power to the battery management system (BMS). The voltage of the sodium-ion battery pack cannot maintain the minimum operating voltage required by the core components such as the BMS sampling circuit, control chip, and communication module, causing the BMS to fail to start, the controller relay to engage, and a "deadlock" state to occur, preventing the entire battery pack from being charged and activated. Summary of the Invention

[0004] This invention provides a sodium-ion battery device and an energy storage device to improve the operational reliability and responsiveness of the sodium-ion battery device.

[0005] In a first aspect, the present invention provides a sodium-ion battery device, comprising: a sodium-ion battery pack, a battery management system, a voltage conversion module, and a backup power supply module; The voltage conversion module is electrically connected to the sodium-ion battery pack, the battery management system, and the backup power supply module, respectively. The backup power supply module is also electrically connected to the battery management system, and the battery management system is also electrically connected to the sodium-ion battery pack. The voltage conversion module is used to convert the voltage signal provided by the sodium-ion battery pack into the power supply voltage required by the battery management system. The battery management system is configured as follows: Obtain the current voltage of the sodium-ion battery pack and the output voltage of the voltage conversion module; Based on the current voltage and the output voltage, control the voltage conversion module or the backup power supply module to supply power to the battery management system.

[0006] Optionally, the battery management system is further configured to: Determine whether the current voltage is greater than a first preset voltage, and whether the output voltage is greater than a set voltage; If so, the voltage conversion module is controlled to provide the power supply voltage to the battery management system.

[0007] Optionally, the battery management system is further configured as follows: If the current voltage is less than or equal to the first preset voltage, or the output voltage is less than or equal to the set voltage, a low voltage emergency warning is issued, and within the warning time, it is determined in real time whether the current voltage is greater than 0V and less than or equal to the second preset voltage; If so, then control the backup power supply module to provide the power supply voltage to the battery management system, and control the voltage conversion module to stop providing the power supply voltage to the battery management system; Wherein, the second preset voltage is less than the first preset voltage.

[0008] Optionally, the battery management system is further configured as follows: When the backup power supply module provides the power supply voltage to the battery management system, if the current voltage is 0V, the battery management system is controlled to enter a low-power operation mode.

[0009] Optionally, the battery management system is further configured as follows: If the current voltage is greater than the first preset voltage during the warning period, the voltage conversion module continues to provide the power supply voltage to the battery management system.

[0010] Optionally, the battery management system is further configured to: If the current voltage is greater than the first preset voltage and the output voltage is greater than the set voltage, then it is determined whether the remaining power of the backup power supply module is less than the preset power. If so, the voltage conversion module is controlled to charge the backup power supply module.

[0011] Optionally, the sodium-ion battery device also includes: A charging switch, one end of which is electrically connected to the voltage conversion module, and the other end of which is electrically connected to the backup power supply module; The battery management system is electrically connected to the control terminal of the charging switch.

[0012] Optionally, the sodium-ion battery device also includes: The backup charging interface is electrically connected to the backup power supply module.

[0013] Optionally, the backup power supply module includes a lithium battery.

[0014] In a second aspect, the present invention provides an energy storage device, including the sodium-ion battery device described in the first aspect.

[0015] The technical solution provided by this invention involves setting a backup power supply module in the sodium-ion battery device. When the battery management system determines, based on the current voltage of the sodium-ion battery pack and the output voltage of the voltage conversion module, that the voltage conversion module cannot provide a stable power supply voltage to the battery management system, the backup power supply module provides a power supply voltage to the battery management system. This allows the battery management system to receive a stable power supply voltage and maintain its operational state. Consequently, when an external charging device is connected to the sodium-ion battery device, the battery management system can communicate normally, improving the operational reliability and responsiveness of the sodium-ion battery device. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a sodium-ion battery device provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of another sodium-ion battery device provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of another sodium-ion battery device provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of an energy storage device provided in an embodiment of the present invention. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0018] Figure 1 This is a schematic diagram of a sodium-ion battery device provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the sodium-ion battery device 100 includes a sodium-ion battery pack 10, a battery management system 20, a voltage conversion module 30, and a backup power supply module 40. The voltage conversion module 30 is electrically connected to the sodium-ion battery pack 10, the battery management system 20, and the backup power supply module 40. The backup power supply module 40 is also electrically connected to the battery management system 20, and the battery management system 20 is also electrically connected to the sodium-ion battery pack 10. The voltage conversion module 30 is used to convert the voltage signal provided by the sodium-ion battery pack 10 into the power supply voltage required by the battery management system 20. The battery management system 20 is configured to: acquire the current voltage of the sodium-ion battery pack and the output voltage of the voltage conversion module; and control the voltage conversion module or the backup power supply module to supply power to the battery management system based on the current voltage and the output voltage.

[0019] The sodium-ion battery pack 10 includes multiple cells connected in series and / or parallel. The number of cells in the sodium-ion battery pack 10 can be set according to actual needs and is not specifically limited here. The battery management system 20 can monitor the voltage, current, temperature and other parameters of the sodium-ion battery pack 10 in real time. When an abnormal situation such as overcharging, over-discharging, overcurrent, or overheating is detected in the sodium-ion battery pack 10, the charging and discharging circuit of the sodium-ion battery pack 10 is immediately cut off to improve the safety of the sodium-ion battery pack 10. The backup power supply module 40 includes a backup battery pack, which includes lithium batteries or lead-acid batteries. In an optional embodiment, the backup power supply module 40 includes a lithium battery. Lithium batteries have a long cycle life, low cost, strong adaptability to high and low temperatures, wide environmental tolerance range, high charging and discharging efficiency, low energy loss, and low self-discharge rate, which can reduce the power loss after idleness and eliminate the need for frequent recharging, thereby improving the power supply reliability of the backup power supply module 40. Based on the fact that the backup power supply module 40 can provide the power supply voltage required by the battery management system 20, this application does not limit the specific structure of the backup power supply module 40.

[0020] The current voltage of the sodium-ion battery pack 10 represents the current total voltage signal of the sodium-ion battery pack 10, and the output voltage of the voltage conversion module 30 represents the voltage value output by the voltage conversion module 30 after stepping down or stepping up the current voltage of the sodium-ion battery pack 10.

[0021] Specifically, the battery management system 20 is also used to control the charging and discharging state of the sodium-ion battery pack 10. However, when there is no power supply voltage input to the battery management system 20, it cannot be woken up and therefore cannot work, preventing the sodium-ion battery pack 10 from charging or discharging. Therefore, this application provides a backup power supply module 40 in the sodium-ion battery device 100. When the battery management system 20 determines that the voltage conversion module 30 cannot provide power supply voltage to the battery management system 20 based on the current voltage and output voltage, the backup power supply module 40 is controlled to provide power supply voltage to the battery management system 20. This allows the battery management system 20 to work normally under the power supply voltage. After the external charging device is electrically connected to the sodium-ion battery pack 10, the battery management system 20 can be woken up normally, thereby performing state diagnosis and charging / discharging state switching of the sodium-ion battery pack 10, improving the working reliability of the sodium-ion battery device 100 and avoiding the problem that the battery management system 20 cannot respond to external charging due to its own power loss.

[0022] The technical solution provided by this invention, by setting a backup power supply module in the sodium-ion battery device, allows the backup power supply module to provide power to the battery management system when the battery management system determines, based on the current voltage of the sodium-ion battery pack and the output voltage of the voltage conversion module, that the voltage conversion module cannot provide a stable power supply voltage to the battery management system. This enables the battery management system to receive a stable power supply voltage and maintain its working state. Furthermore, it ensures normal communication when an external charging device is connected to the sodium-ion battery device, improving the reliability, responsiveness, and response time of the sodium-ion battery device, and enhancing its robustness.

[0023] Optionally, the battery management system is also configured to: determine whether the current voltage is greater than a first preset voltage and whether the output voltage is greater than a set voltage; if so, control the voltage conversion module to provide power supply voltage to the battery management system.

[0024] The first preset voltage and the set voltage can be fixed or non-fixed values. In an exemplary embodiment, the first preset voltage is 1V*n, where n is the number of individual cells in the sodium-ion battery pack 10, and the set voltage is 4.5V. The supply voltage can be 5V or 3.3V, and can be set according to actual needs; no specific limitation is made here.

[0025] Specifically, if the current voltage is greater than the first preset voltage, it indicates that the current voltage of the sodium-ion battery pack 10 is normal. If the output voltage is greater than the set voltage, it indicates that the voltage signal provided by the voltage conversion unit 30 to the battery management system 20 can meet the power supply requirements of the battery management system 20. Therefore, when the current voltage is greater than the first preset voltage and the output voltage is greater than the set voltage, the voltage conversion module 30 is controlled to provide power to the battery management system 20, and at this time, no backup power supply module 40 is needed.

[0026] Optionally, the battery management system is also configured to: if the current voltage is greater than the first preset voltage and the output voltage is greater than the set voltage, determine whether the remaining power of the backup power supply module is less than the preset power; if so, control the voltage conversion module to charge the backup power supply module.

[0027] The remaining power of the backup power supply module 40 represents the percentage of its rated capacity that is available. The preset power level can be a fixed value or a non-fixed value. In an exemplary embodiment, the preset power level is 50%, but it can also be other values, which are not specifically limited here.

[0028] Specifically, if the current voltage is greater than the first preset voltage and the output voltage is greater than the set voltage, it means that the voltage conversion module 30 can stably provide a power supply voltage to the battery management system 20, and the current voltage of the sodium-ion battery pack 10 is relatively high. If the remaining power of the backup power supply module 40 is less than the preset power, it means that the remaining power of the backup power supply module 40 is low. In this case, the voltage conversion module 30 is controlled to charge the backup power supply module 40 to increase the power of the backup power supply module 40. This ensures that when the voltage conversion module 30 is unable to provide a stable power supply voltage to the battery management system 20, the backup power supply module 40 can provide a stable and reliable power supply voltage to the battery management system 20, thereby increasing the duration of the backup power supply module 40 providing the power supply voltage and improving the working responsiveness and reliability of the sodium-ion battery device 100.

[0029] Optional, Figure 2 This is a schematic diagram of another sodium-ion battery device provided in an embodiment of the present invention, as shown below. Figure 2 As shown, the sodium-ion battery device also includes a charging switch S1, one end of which is electrically connected to the voltage conversion module 30, and the other end of which is electrically connected to the backup power supply module 40; the battery management system 20 is electrically connected to the control terminal of the charging switch S1.

[0030] The charging switch S1 can include relays or contactors, etc., and can be set according to actual needs. No specific limitation is made here.

[0031] Specifically, when the charging switch S1 is in the ON state, the output voltage provided by the voltage conversion module 30 can be transmitted to the backup power supply module 40 through the charging switch S1, thereby charging the backup power supply module 40. When the charging switch S1 is in the OFF state, the output voltage provided by the voltage conversion module 30 cannot be transmitted to the backup power supply module 40 through the charging switch S1, and charging the backup power supply module 40 cannot be achieved. The battery management system 20 is electrically connected to the control terminal of the charging switch S1, enabling the battery management system 20 to control the charging switch S1 to be in the ON or OFF state. Thus, if the current voltage is greater than the first preset voltage and the output voltage is greater than the set voltage, and the remaining power of the backup power supply module is less than the preset power, the battery management system 20 controls the charging switch S1 to be in the ON state, allowing the voltage conversion module 30 to charge the backup power supply module 40. If the current voltage is greater than the first preset voltage and the output voltage is greater than the set voltage, and the remaining power of the backup power supply module is greater than or equal to the preset power, the battery management system 20 controls the charging switch S1 to be in the OFF state, causing the voltage conversion module 30 to stop charging the backup power supply module 40.

[0032] Optionally, the battery management system is further configured to: if the current voltage is less than or equal to the first preset voltage, or the output voltage is less than or equal to the set voltage, issue a low voltage emergency warning, and within the warning time, determine in real time whether the current voltage is greater than 0V and less than or equal to the second preset voltage; if so, control the backup power supply module to provide power supply voltage to the battery management system, and control the voltage conversion module to stop providing power supply voltage to the battery management system.

[0033] The second preset voltage is lower than the first preset voltage. The second preset voltage can be a fixed value or a non-fixed value. The warning time is related to parameters such as the voltage drop rate of the sodium-ion battery. In an exemplary embodiment, the second preset voltage is 0.4V*n, where n is the number of cells in the sodium-ion battery pack 10, and the warning time is 5 seconds. The specific values ​​of the second preset voltage and the warning time can also be other, and are not specifically limited here. The low-voltage emergency warning method can be an audible and visual alarm or an information communication alarm. The audible and visual alarm can be an LED indicator or a buzzer, etc., while the information communication alarm can be a pop-up window on a display screen, a wireless alarm, or an Ethernet communication alarm, etc., and can be set according to actual needs.

[0034] Specifically, if the current voltage is less than or equal to the first preset voltage, or the output voltage is less than or equal to the set voltage, it indicates that the current voltage of the sodium-ion battery pack 10 is low. The voltage output by the voltage conversion module 30 after converting the voltage of the sodium-ion battery pack 10 cannot meet the power supply requirements of the battery management system 20. At this time, the battery management system 20 issues a low voltage emergency warning. During the warning period, if the current voltage of the sodium-ion battery pack 10 is greater than 0V and less than or equal to the second preset voltage, it indicates that the current voltage of the sodium-ion battery pack 10 is continuously decreasing, and the voltage output by the voltage conversion module 30 after converting the current voltage of the sodium-ion battery pack 10 can no longer meet the power supply requirements of the battery management system 20. Therefore, at this time, it is necessary to immediately control the backup power supply module 40 to provide power supply voltage to the battery management system 20 to ensure the power supply reliability and continuous operation of the battery management system 20.

[0035] Optionally, the battery management system is also specifically configured to: when the backup power supply module provides power supply voltage to the battery management system, if the current voltage is 0V, control the battery management system to enter a low-power operation mode.

[0036] When the battery management system 20 enters a low-power operation mode, it will reduce the sampling frequency (e.g., once every few seconds or minutes), reduce the power consumption of the sampling circuit, shut down unnecessary communication modules and unnecessary devices (e.g., turn off the display screen, indicator lights, buzzers, etc.), and retain only the necessary wake-up and alarm functions.

[0037] Specifically, if the current voltage of the sodium-ion battery pack 10 is 0V, the power supply voltage of the battery management system 20 cannot be obtained from the voltage conversion module 30, but can only be obtained from the backup power supply module 40. By controlling the battery management system 20 to enter a low-power operation mode, the duration for which the backup power supply module 40 controls the battery management system 20 to maintain basic functions such as being able to be woken up is extended, thereby increasing the working time of the battery management system 20. This allows the battery management system 20 to complete communication responses with the external charging device after it is connected to the sodium-ion battery device, controlling the charging circuit of the sodium-ion battery pack 10 to be turned on, thereby enabling the external charging device to charge the sodium-ion battery pack 10 and improving the operational reliability of the sodium-ion battery device 100.

[0038] Optionally, the battery management system 20 is further configured to: if the current voltage is greater than the first preset voltage during the warning period, maintain the voltage conversion module to provide power supply voltage to the battery management system.

[0039] Specifically, if the sodium-ion battery pack 10 adjusts itself within the warning time or the staff makes the current voltage greater than the first preset voltage, it means that the current voltage of the sodium-ion battery pack 10 can enable the battery management system 20 to work normally after being converted by the voltage conversion module 30. Therefore, the voltage conversion module 30 continues to supply power to the battery management system 20, and there is no need to switch the backup power supply module 40 to supply power.

[0040] Optional, Figure 3 This is a schematic diagram of another sodium-ion battery device provided in an embodiment of the present invention, as shown below. Figure 3 As shown, the sodium-ion battery device 100 also includes a backup charging interface E0, which is electrically connected to the backup power supply module 40.

[0041] The backup charging port E0 includes a type-C charging port or a USB charging port, which can be set according to actual needs. No specific limitation is made here.

[0042] Specifically, when the remaining power of the backup power supply module 40 is low or zero, in addition to the voltage conversion module 30 supplying power to the backup power supply module 40, an external charging device can charge the backup power supply module 40 through the backup charging interface E0. Thus, after the sodium-ion battery device 100 is manufactured, the backup power supply module 40 is charged through the backup charging interface E0. This ensures that when the voltage output by the voltage conversion module 30 cannot meet the power supply requirements of the battery management system 20, the backup power supply module 40 can promptly provide power to the battery management system 20, improving the sustainability and reliability of the battery management system 20 and the overall reliability of the sodium-ion battery device 100.

[0043] Based on the same inventive concept, embodiments of the present invention also provide an energy storage device. Figure 4 This is a schematic diagram of the structure of an energy storage device provided in an embodiment of the present invention, as shown below. Figure 4 As shown, the energy storage device 200 includes the sodium-ion battery device 100 provided in any embodiment of the present invention. Therefore, the energy storage device 200 possesses the technical features of the sodium-ion battery device 100 provided in the embodiments of the present invention, and can achieve the beneficial effects of the sodium-ion battery device 100 provided in the embodiments of the present invention. Similarities can be referred to the above description of the sodium-ion battery device 100 provided in the embodiments of the present invention, and will not be repeated here.

[0044] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A sodium-ion battery device, characterized in that, include: Sodium-ion battery pack, battery management system, voltage conversion module, backup power supply module; The voltage conversion module is electrically connected to the sodium-ion battery pack, the battery management system, and the backup power supply module, respectively. The backup power supply module is also electrically connected to the battery management system, and the battery management system is also electrically connected to the sodium-ion battery pack. The voltage conversion module is used to convert the voltage signal provided by the sodium-ion battery pack into the power supply voltage required by the battery management system. The battery management system is configured as follows: Obtain the current voltage of the sodium-ion battery pack and the output voltage of the voltage conversion module; Based on the current voltage and the output voltage, control the voltage conversion module or the backup power supply module to supply power to the battery management system.

2. The sodium-ion battery device according to claim 1, characterized in that, The battery management system is also configured to: Determine whether the current voltage is greater than a first preset voltage, and whether the output voltage is greater than a set voltage; If so, the voltage conversion module is controlled to provide the power supply voltage to the battery management system.

3. The sodium-ion battery device according to claim 2, characterized in that, The battery management system is further configured as follows: If the current voltage is less than or equal to the first preset voltage, or the output voltage is less than or equal to the set voltage, a low voltage emergency warning is issued, and within the warning time, it is determined in real time whether the current voltage is greater than 0V and less than or equal to the second preset voltage; If so, then control the backup power supply module to provide the power supply voltage to the battery management system, and control the voltage conversion module to stop providing the power supply voltage to the battery management system; Wherein, the second preset voltage is less than the first preset voltage.

4. The sodium-ion battery device according to claim 3, characterized in that, The battery management system is further configured as follows: When the backup power supply module provides the power supply voltage to the battery management system, if the current voltage is 0V, the battery management system is controlled to enter a low-power operation mode.

5. The sodium-ion battery device according to claim 3, characterized in that, The battery management system is further configured as follows: If the current voltage is greater than the first preset voltage during the warning period, the voltage conversion module continues to provide the power supply voltage to the battery management system.

6. The sodium-ion battery device according to claim 2, characterized in that, The battery management system is also configured to: If the current voltage is greater than the first preset voltage and the output voltage is greater than the set voltage, then it is determined whether the remaining power of the backup power supply module is less than the preset power. If so, the voltage conversion module is controlled to charge the backup power supply module.

7. The sodium-ion battery device according to claim 6, characterized in that, Also includes: A charging switch, one end of which is electrically connected to the voltage conversion module, and the other end of which is electrically connected to the backup power supply module; The battery management system is electrically connected to the control terminal of the charging switch.

8. The sodium-ion battery device according to claim 1, characterized in that, Also includes: The backup charging interface is electrically connected to the backup power supply module.

9. The sodium-ion battery device according to claim 1, characterized in that, The backup power supply module includes a lithium battery.

10. An energy storage device, characterized in that, include: The sodium-ion battery device according to any one of claims 1 to 9.

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