Sodium-ion battery charging temperature protection circuit and battery management system

Abstract

The present disclosure provides a sodium-ion battery charging temperature protection circuit, which comprises a first control module, a second control module and a normally closed temperature switch. The control end of the first control module is connected with a charger identification signal end, the first end is connected with the first end of the normally closed temperature switch, and the second end is grounded. The control end of the second control module is connected with the second end of the normally closed temperature switch, the first end is connected with a power supply end, and the second end is connected with a charging output end. The sodium-ion battery charging temperature protection circuit does not rely on an integrated circuit chip for battery protection to achieve temperature protection, and detects the temperature of the sodium-ion battery by using the normally closed temperature switch. When the battery temperature exceeds a safety threshold, the circuit can timely cut off the charging circuit, effectively preventing the sodium-ion battery from appearing thermal runaway phenomenon, improving the safety of the energy storage sodium-ion battery, and avoiding relying on the temperature protection function of the integrated circuit chip, thereby reducing the circuit use cost.

Description

Technical Field

[0001] This disclosure relates to the technical field of sodium-ion batteries, and in particular to a sodium-ion battery charging temperature protection circuit and battery management system. Background Technology

[0002] Lithium-ion battery technology, with its mature application system, dominates many fields and is widely used in motorcycles, electric vehicles, energy storage batteries, and consumer electronics. However, with the global popularization of new energy technologies, the widespread use of lithium-ion batteries has led to a sharp increase in the demand for lithium resources, and the dilemma of resource shortage is gradually emerging.

[0003] Against this backdrop, researchers have focused their attention on the development and application of sodium-ion batteries for energy storage. Sodium possesses numerous advantages, including abundant resources, low cost, and good safety performance, making sodium-ion batteries for energy storage show great promise. However, sodium-ion batteries are highly susceptible to thermal runaway, which can lead to fires and pose a serious threat to people's lives and property.

[0004] Currently, thermal runaway management in sodium-ion batteries primarily relies on the temperature protection function built into the integrated circuit chip. This involves placing negative temperature coefficient (NTC) thermistors on the surface of the sodium-ion battery cell. These thermistors detect the temperature and convert it into a corresponding resistance value. The integrated circuit chip then uses the voltage level signal from the thermistor to implement temperature protection. However, this method, which depends on the integrated circuit chip, results in a complex and costly protection circuit structure. Utility Model Content

[0005] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a sodium-ion battery charging temperature protection circuit and battery management system that are simple in structure and low in cost.

[0006] The purpose of this disclosure is achieved through the following technical solution:

[0007] A sodium-ion battery charging temperature protection circuit includes a first control module, a second control module, and a normally closed temperature switch. The control terminal of the first control module is connected to the charger identification signal terminal, the first terminal of the first control module is connected to the first terminal of the normally closed temperature switch, the second terminal of the first control module is grounded, the control terminal of the second control module is connected to the second terminal of the normally closed temperature switch, the first terminal of the second control module is connected to the power supply terminal, and the second terminal of the second control module is connected to the charging output terminal.

[0008] In one embodiment, the first control module includes a first voltage divider resistor and a first electronic switch. The first end of the first voltage divider resistor is connected to the charger identification signal terminal, the second end of the first voltage divider resistor is connected to the control terminal of the first electronic switch, the first end of the first electronic switch is connected to the first end of the normally closed temperature switch, and the second end of the first electronic switch is grounded.

[0009] In one embodiment, the first control module further includes a second voltage divider resistor, the first end of which is connected to the second end of the first voltage divider resistor, and the second end of the second voltage divider resistor is grounded.

[0010] In one embodiment, the first electronic switch is an N-channel MOS transistor.

[0011] In one embodiment, the second control module includes a third voltage divider resistor and a second electronic switch. The first end of the third voltage divider resistor is connected to the power supply terminal, and the second end of the third voltage divider resistor is connected to the control terminal of the second electronic switch. The control terminal of the second electronic switch is also connected to the second end of the normally closed temperature switch. The first end of the second electronic switch is connected to the power supply terminal, and the second end of the second electronic switch is connected to the charging output terminal.

[0012] In one embodiment, the second control module further includes a fourth voltage divider resistor, the first end of which is connected to the second end of the third voltage divider resistor, and the second end of which is connected to the second end of the normally closed temperature switch.

[0013] In one embodiment, the second electronic switch is a P-channel MOS transistor.

[0014] In one embodiment, the normally closed temperature switch is a 50°C normally closed temperature switch.

[0015] In one embodiment, the power supply terminal is connected to a 12V regulated power supply.

[0016] This application also provides a battery management system, including the sodium-ion battery charging temperature protection circuit described in any embodiment.

[0017] Compared with the prior art, this disclosure has at least the following advantages:

[0018] The sodium-ion battery charging temperature protection circuit described above does not rely on integrated circuit chips for battery protection. Instead, it uses a normally closed temperature switch to detect the sodium-ion battery temperature and promptly cuts off the charging circuit when the battery temperature exceeds a safety threshold. This prevents thermal runaway in the sodium-ion battery, improves the safety of the energy storage sodium-ion battery, and avoids the reliance on the temperature protection function built into the integrated circuit chip in existing technologies, thereby reducing the circuit's operating cost. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A circuit diagram of a sodium-ion battery charging temperature protection circuit according to one embodiment. Detailed Implementation

[0021] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0022] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments:

[0025] like Figure 1As shown, a sodium-ion battery charging temperature protection circuit 10 according to an embodiment of this disclosure includes a first control module 100, a second control module 200, and a normally closed temperature switch DT1. The control terminal of the first control module 100 is connected to the charger identification signal terminal CHG_IN. The first terminal of the first control module 100 is connected to the first terminal of the normally closed temperature switch DT1, and the second terminal of the first control module 100 is grounded. The control terminal of the second control module 200 is connected to the second terminal of the normally closed temperature switch DT1. The first terminal of the second control module 200 is connected to the power supply terminal, and the second terminal of the second control module 200 is connected to the charging output terminal CHG_DRIVER.

[0026] In this embodiment, when the charger is plugged in, the charger outputs a charger identification signal to the control terminal of the first control module 100 via the charger identification signal terminal CHG_IN, causing the first control module 100 to conduct. If the surface temperature of the sodium-ion battery cell does not reach the trigger threshold temperature of the normally closed temperature switch DT1, the normally closed temperature switch DT1 will remain closed. Because the second terminal of the normally closed temperature switch DT1 is connected to the control terminal of the second control module 200, the control terminal of the second control module 200 receives a level signal, causing the second control module 200 to conduct. This allows the current output from the power supply terminal to be output to the charging output terminal CHG_DRIVER through the second control module 200, thereby completing the charging of the sodium-ion battery.

[0027] Furthermore, if the surface temperature of the sodium-ion battery cell reaches the trigger threshold temperature of the normally closed temperature switch DT1, the normally closed temperature switch DT1 will switch to the open state. At this time, even if the charger is plugged in and the charger identification signal terminal CHG_IN outputs the charger identification signal, the internal contacts of the normally closed temperature switch DT1 are open, causing the control terminal of the second control module 200 to lose electrical connection with the first terminal of the normally closed temperature switch DT1. The control terminal of the second control module 200 cannot obtain a level signal, and the second control module 200 cannot be turned on. As a result, the current output from the power supply terminal cannot be output to the charging output terminal CHG_DRIVER through the second control module 200, thereby enabling the sodium-ion battery charging temperature protection circuit 10 to achieve the high temperature protection function.

[0028] The sodium-ion battery charging temperature protection circuit 10 described above does not rely on integrated circuit chips for battery protection for temperature protection. Instead, it uses a normally closed temperature switch DT1 to detect the temperature of the sodium-ion battery. When the battery temperature exceeds the safety threshold, the charging circuit is cut off in time to prevent thermal runaway of the sodium-ion battery. This improves the safety of the energy storage sodium-ion battery and avoids the reliance on the temperature protection function built into the integrated circuit chip in the prior art, thereby reducing the circuit usage cost.

[0029] like Figure 1As shown, in one embodiment, the first control module 100 includes a first voltage divider resistor R1 and a first electronic switch M1. The first end of the first voltage divider resistor R1 is connected to the charger identification signal terminal CHG_IN, and the second end of the first voltage divider resistor R1 is connected to the control terminal of the first electronic switch M1. The first end of the first electronic switch M1 is connected to the first end of a normally closed temperature switch DT1, and the second end of the first electronic switch M1 is grounded. In this embodiment, when the charger is plugged in, the charger outputs a charger identification signal through the charger identification signal terminal CHG_IN. Since the first end of the first voltage divider resistor R1 is directly connected to the charger identification signal terminal CHG_IN, the charger identification signal is applied to the first voltage divider resistor R1. Through the voltage division of the first voltage divider resistor R1, the voltage applied to the control terminal of the first electronic switch M1 is ensured to be within a suitable range, thereby ensuring the stable operation of the first electronic switch M1. After the charger identification signal is divided by the first voltage divider resistor R1, the voltage is applied to the control terminal of the first electronic switch M1, causing the first electronic switch M1 to conduct. At this time, if the surface temperature of the sodium-ion battery cell does not reach the trigger threshold temperature of the normally closed temperature switch DT1, the normally closed temperature switch DT1 will remain closed. Since the first terminal of the first electronic switch M1 is connected to the first terminal of the normally closed temperature switch DT1, and the second terminal of the first electronic switch M1 is grounded, when the first electronic switch M1 is turned on, because the second terminal of the normally closed temperature switch DT1 is connected to the control terminal of the second control module 200, when the normally closed temperature switch DT1 is closed and the first electronic switch M1 is turned on, the control terminal of the second control module 200 forms a loop with the ground terminal through the first control module 100, so that the control terminal of the second control module 200 reaches its conduction threshold voltage, thereby turning on the second control module 200. The current output from the power supply terminal can be output to the charging output terminal CHG_DRIVER through the second control module 200, thereby completing the charging of the sodium-ion battery.

[0030] Furthermore, if the surface temperature of the sodium-ion battery cell reaches the trigger threshold temperature of the normally closed temperature switch DT1, the normally closed temperature switch DT1 will switch to the open state. At this time, even if the charger is plugged in, the charger identification signal terminal CHG_IN outputs the charger identification signal. Because the internal contacts of the normally closed temperature switch DT1 are open, although the first electronic switch tube M1 may still be in the conducting state, the opening of the normally closed temperature switch DT1 causes the control terminal of the second control module 200 to lose the effective electrical connection with the first terminal of the normally closed temperature switch DT1. This makes it impossible for the control terminal of the second control module 200 to obtain the level signal required to maintain its conduction. The second control module 200 cannot conduct, thus the current output from the power supply terminal cannot be output to the charging output terminal CHG_DRIVER through the second control module 200, thereby enabling the sodium-ion battery charging temperature protection circuit 10 to achieve the high temperature protection function.

[0031] like Figure 1 As shown, in one embodiment, the first control module 100 further includes a second voltage divider resistor R2. The first end of the second voltage divider resistor R2 is connected to the second end of the first voltage divider resistor R1, and the second end of the second voltage divider resistor R2 is grounded. In this embodiment, the introduction of the second voltage divider resistor R2, together with the first voltage divider resistor R1, forms a voltage divider network. When the charger is plugged in, the charger identification signal output from the charger identification signal terminal CHG_IN is applied to the first voltage divider resistor R1. The first voltage divider resistor R1 performs initial voltage division on the signal, and the second voltage divider resistor R2 further divides the voltage after it has been divided by the first voltage divider resistor R1. On the one hand, it can more accurately control the voltage applied to the control terminal of the first electronic switch transistor M1. On the other hand, the second voltage divider resistor R2 also plays a role in current limiting protection. During circuit operation, the second voltage divider resistor R2 can limit the current flowing into the control terminal of the first electronic switch transistor M1, preventing excessive current from damaging the first electronic switch transistor M1, and further enhancing the circuit's anti-interference capability and safety.

[0032] like Figure 1 As shown, in one embodiment, the first electronic switch M1 is an N-channel MOSFET. In this embodiment, the first terminal of the first electronic switch M1 is the drain of the N-channel MOSFET, the second terminal of the first electronic switch M1 is the source of the N-channel MOSFET, and the control terminal of the first electronic switch M1 is the gate of the N-channel MOSFET. When the charger is inserted and the charger identification signal is divided to turn on the N-channel MOSFET M1, the charger identification signal is applied to the voltage divider network composed of the first voltage divider resistor R1 and the second voltage divider resistor R2. The voltage after voltage division is applied to the gate of the N-channel MOSFET M1, causing it to reach the conduction threshold voltage of the N-channel MOSFET and quickly turn on. This allows the current output from the power supply terminal to be quickly output to the charging output terminal CHG_DRIVER through the second control module 200, starting the charging of the sodium-ion battery. Furthermore, when the surface temperature of the sodium-ion battery cell reaches the trigger threshold temperature of the normally closed temperature switch DT1, and the normally closed temperature switch DT1 is opened, although the N-channel MOSFET M1 is in the conducting state because the gate voltage still exists, the opening of the normally closed temperature switch DT1 causes the control terminal of the second control module 200 to lose effective electrical connection, and the second control module 200 cannot be turned on. This allows the sodium-ion battery charging temperature protection circuit 10 to respond to temperature changes in a very short time, cut off the charging circuit in time, prevent the sodium-ion battery from thermal runaway, and thus improve the effectiveness of the circuit for high temperature protection.

[0033] like Figure 1As shown, in one embodiment, the second control module 200 includes a third voltage divider resistor R3 and a second electronic switch M2. The first end of the third voltage divider resistor R3 is connected to the power supply terminal, and the second end of the third voltage divider resistor R3 is connected to the control terminal of the second electronic switch M2. The control terminal of the second electronic switch M2 is also connected to the second terminal of a normally closed temperature switch DT1. The first end of the second electronic switch M2 is connected to the power supply terminal, and the second end of the second electronic switch M2 is connected to the charging output terminal CHG_DRIVER. In this embodiment, when the charger is inserted and the surface temperature of the sodium-ion battery cell has not reached the trigger threshold temperature of the normally closed temperature switch DT1, the normally closed temperature switch DT1 remains closed, and the first electronic switch M1 in the first control module 100 is turned on. At this time, the voltage output from the power supply terminal is applied to the third voltage divider resistor R3. The third voltage divider resistor R3 divides the voltage at the power supply terminal, applying a suitable voltage to the control terminal of the second electronic switch M2. By appropriately selecting the resistance value of the third voltage divider resistor R3, the voltage applied to the control terminal of the second electronic switch M2 can be precisely controlled, thereby turning on the second electronic switch M2. Since the first terminal of the second electronic switch M2 is connected to the power supply terminal and the second terminal is connected to the charging output terminal CHG_DRIVER, when the second electronic switch M2 is turned on, the current output from the power supply terminal can flow smoothly through the second electronic switch M2 to the charging output terminal CHG_DRIVER, thus completing the charging of the sodium-ion battery. If the surface temperature of the sodium-ion battery cell reaches the trigger threshold temperature of the normally closed temperature switch DT1, the normally closed temperature switch DT1 switches to the open state. At this time, the control terminal of the second control module 200 loses its effective electrical connection with the first terminal of the normally closed temperature switch DT1 and cannot obtain the level signal required to maintain the conduction of the second electronic switch M2. Therefore, the second electronic switch M2 cannot be turned on, the current output from the power supply terminal is cut off, and it cannot be output to the charging output terminal CHG_DRIVER through the second electronic switch M2, thus achieving the high-temperature protection function.

[0034] like Figure 1As shown, in one embodiment, the second control module 200 further includes a fourth voltage divider resistor R4. The first end of the fourth voltage divider resistor R4 is connected to the second end of the third voltage divider resistor R3, and the second end of the fourth voltage divider resistor R4 is connected to the second end of the normally closed temperature switch DT1. In this embodiment, when the charger is inserted and the surface temperature of the sodium-ion battery cell does not reach the trigger threshold temperature of the normally closed temperature switch DT1, the normally closed temperature switch DT1 remains closed. At this time, the voltage output from the power supply terminal is applied to the third voltage divider resistor R3. After initial voltage division, the fourth voltage divider resistor R4 further fine-tunes the voltage. Through the voltage divider network composed of the third voltage divider resistor R3 and the fourth voltage divider resistor R4, the voltage applied to the control terminal of the second electronic switch M2 can be controlled more precisely, thereby ensuring that the voltage applied to the control terminal of the second electronic switch M2 is always within the optimal operating range, improving the stability of the operation of the second electronic switch M2, reducing the risk of abnormal operation of the switch due to voltage deviation, and thus ensuring the stability of the charging process.

[0035] like Figure 1 As shown, in one embodiment, the second electronic switch M2 is a P-channel MOSFET. In this embodiment, the first terminal of the second electronic switch M2 is the source of the N-channel MOSFET, the second terminal of the second electronic switch M2 is the drain of the N-channel MOSFET, and the control terminal of the second electronic switch M2 is the gate of the N-channel MOSFET. When the charger is inserted and the surface temperature of the sodium-ion battery cell does not reach the trigger threshold temperature of the normally closed temperature switch DT1, the normally closed temperature switch DT1 remains closed, and the first electronic switch M1 in the first control module 100 is turned on, so that the control terminal of the second control module 200 forms an effective electrical connection with the ground terminal through the first control module 100. At this time, the voltage output from the power supply terminal is applied to the voltage divider network composed of the third voltage divider resistor R3 and the fourth voltage divider resistor R4, and the voltage after voltage division is applied to the gate of the P-channel MOSFET M2. Due to the conduction characteristics of the P-channel MOSFET, when the gate voltage is sufficiently low relative to the source voltage, the second electronic switch M2 will turn on. In this circuit, the power supply terminal acts as the source. A suitable low voltage, after voltage division, is applied to the gate, causing the second electronic switch M2 to quickly reach the conduction threshold and turn on rapidly. Once the second electronic switch M2 is turned on, a low-impedance path is formed between the power supply terminal (source) and the charging output terminal CHG_DRIVER (drain). The current output from the power supply terminal can flow smoothly through the P-channel MOSFET M2 to the charging output terminal CHG_DRIVER with minimal loss, thereby efficiently completing the charging of the sodium-ion battery.

[0036] Furthermore, if the surface temperature of the sodium-ion battery cell reaches the trigger threshold temperature of the normally closed temperature switch DT1, DT1 switches to the open state. At this time, the control terminal of the second control module 200 loses its effective electrical connection with the first terminal of the normally closed temperature switch DT1, and the gate of the P-channel MOSFET M2 cannot obtain the low-level signal required to maintain its conduction. According to the characteristics of the P-channel MOSFET, when the gate voltage rises relative to the source voltage to the threshold, the P-channel MOSFET M2 will be turned off. In this circuit, because the normally closed temperature switch DT1 is open, the gate voltage loses effective control and gradually rises to near the source voltage, causing the P-channel MOSFET M2 to be quickly turned off. The current output from the power supply terminal is quickly cut off and cannot be output to the charging output terminal CHG_DRIVER through the P-channel MOSFET M2.

[0037] like Figure 1 As shown, in one embodiment, the normally closed temperature switch DT1 is a 50°C normally closed temperature switch DT1. In this embodiment, when the surface temperature of the sodium-ion battery cell is below 50°C, the 50°C normally closed temperature switch DT1 is in a closed state. At this time, if the charger is inserted, the charger identification signal terminal CHG_IN outputs a charger identification signal. After voltage division and control by the first control module 100, the first electronic switch M1 is turned on. Since the normally closed temperature switch DT1 is closed, the control terminal of the second control module 200 can obtain a valid level signal, causing the second electronic switch M2 to turn on. The current output from the power supply terminal flows smoothly through the second electronic switch M2 to the charging output terminal CHG_DRIVER, thereby realizing the normal charging of the sodium-ion battery. This process ensures that the charging process can be carried out stably and efficiently when the battery is within a safe temperature range, meeting the charging requirements of the battery.

[0038] However, when the surface temperature of the sodium-ion battery cell reaches or exceeds 50°C, the normally closed temperature switch DT1 at 50°C will quickly switch to the open state. At this time, even if the charger is plugged in and the charger identification signal terminal CHG_IN continuously outputs the charger identification signal, the control terminal of the second control module 200 loses effective electrical connection with the first terminal of the normally closed temperature switch DT1 because the internal contacts of the normally closed temperature switch DT1 are open, and cannot obtain the level signal required to maintain the conduction of the second electronic switch M2. Therefore, the second electronic switch M2 cannot conduct, the current output from the power supply terminal is cut off, and it cannot be output to the charging output terminal CHG_DRIVER through the second electronic switch M2, thus realizing the high temperature protection function, effectively preventing the sodium-ion battery from thermal runaway due to overheating, and ensuring battery safety. Compared with the temperature protection function relying on the integrated circuit chip itself, the sodium-ion battery charging temperature protection circuit 10 using the normally closed temperature switch DT1 at 50°C is simpler to design. Reducing the complexity of the integrated circuit chip and its related peripheral circuits reduces the complexity and cost of the circuit, and also reduces the risk of protection failure due to integrated circuit chip failure.

[0039] like Figure 1 As shown, in one embodiment, the power supply terminal is connected to a 12V regulated power supply. In this embodiment, during charging, the power supply terminal transmits the 12V voltage to the third voltage divider resistor R3 in the second control module 200. Because the voltage is stable, the third voltage divider resistor R3 can stably apply a suitable voltage to the control terminal of the second electronic switch M2 according to a preset voltage division ratio. This allows the second electronic switch M2 to operate under stable voltage conditions, ensuring accurate switching between its on and off states, thereby guaranteeing the stability and reliability of the charging process.

[0040] This application also provides a battery management system, including a sodium-ion battery charging temperature protection circuit 10 according to any embodiment. In this embodiment, when the charger is inserted, the charger outputs a charger identification signal to the control terminal of the first control module 100 through the charger identification signal terminal CHG_IN, causing the first control module 100 to be turned on. If the surface temperature of the sodium-ion battery cell does not reach the trigger threshold temperature of the normally closed temperature switch DT1, the normally closed temperature switch DT1 will remain closed. Because the second terminal of the normally closed temperature switch DT1 is connected to the control terminal of the second control module 200, the control terminal of the second control module 200 receives a level signal, causing the second control module 200 to be turned on, thereby allowing the current output from the power supply terminal to be output to the charging output terminal CHG_DRIVER through the second control module 200, thereby completing the charging of the sodium-ion battery. Further, if the surface temperature of the sodium-ion battery cell reaches the trigger threshold temperature of the normally closed temperature switch DT1, the normally closed temperature switch DT1 will switch to the open state. At this time, even if the charger is plugged in, the charger identification signal terminal CHG_IN outputs the charger identification signal. Because the internal contacts of the normally closed temperature switch DT1 are open, the control terminal of the second control module 200 loses its electrical connection with the first terminal of the normally closed temperature switch DT1. The control terminal of the second control module 200 cannot obtain a level signal, and the second control module 200 cannot be turned on. As a result, the current output from the power supply terminal cannot be output to the charging output terminal CHG_DRIVER through the second control module 200, thereby enabling the sodium-ion battery charging temperature protection circuit 10 to achieve the high temperature protection function.

[0041] Compared with the prior art, this disclosure has at least the following advantages:

[0042] The sodium-ion battery charging temperature protection circuit 10 described above does not rely on integrated circuit chips for battery protection for temperature protection. Instead, it uses a normally closed temperature switch DT1 to detect the temperature of the sodium-ion battery. When the battery temperature exceeds the safety threshold, the charging circuit is cut off in time to prevent thermal runaway of the sodium-ion battery. This improves the safety of the energy storage sodium-ion battery and avoids the reliance on the temperature protection function built into the integrated circuit chip in the prior art, thereby reducing the circuit usage cost.

[0043] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A sodium-ion battery charging temperature protection circuit, characterized in that, It includes a first control module, a second control module, and a normally closed temperature switch. The control terminal of the first control module is used to connect to the charger identification signal terminal. The first terminal of the first control module is connected to the first terminal of the normally closed temperature switch. The second terminal of the first control module is grounded. The control terminal of the second control module is connected to the second terminal of the normally closed temperature switch. The first terminal of the second control module is used to connect to the power supply terminal. The second terminal of the second control module is used to connect to the charging output terminal.

2. The sodium-ion battery charging temperature protection circuit of claim 1, wherein, The first control module includes a first voltage divider resistor and a first electronic switch. The first end of the first voltage divider resistor is connected to the charger identification signal terminal, the second end of the first voltage divider resistor is connected to the control terminal of the first electronic switch, the first end of the first electronic switch is connected to the first end of the normally closed temperature switch, and the second end of the first electronic switch is grounded.

3. The sodium-ion battery charging temperature protection circuit of claim 2, wherein, The first control module further includes a second voltage divider resistor, the first end of which is connected to the second end of the first voltage divider resistor, and the second end of the second voltage divider resistor is grounded.

4. The sodium-ion battery charging temperature protection circuit according to claim 2, characterized in that, The first electronic switch is an N-channel MOSFET.

5. The sodium-ion battery charge temperature protection circuit of claim 1, wherein, The second control module includes a third voltage divider resistor and a second electronic switch. The first end of the third voltage divider resistor is connected to the power supply terminal, and the second end of the third voltage divider resistor is connected to the control terminal of the second electronic switch. The control terminal of the second electronic switch is also connected to the second end of the normally closed temperature switch. The first end of the second electronic switch is connected to the power supply terminal, and the second end of the second electronic switch is connected to the charging output terminal.

6. The sodium-ion battery charge temperature protection circuit of claim 5, wherein, The second control module further includes a fourth voltage divider resistor, the first end of which is connected to the second end of the third voltage divider resistor, and the second end of which is connected to the second end of the normally closed temperature switch.

7. The sodium-ion battery charge temperature protection circuit of claim 5, wherein, The second electronic switch is a P-channel MOSFET.

8. The sodium-ion battery charge temperature protection circuit of claim 1, wherein, The normally closed temperature switch is a 50°C normally closed temperature switch.

9. The sodium-ion battery charge temperature protection circuit of claim 1, wherein, The power supply terminal is connected to a 12V regulated power supply.

10. A battery management system, characterized in that, Includes a sodium-ion battery charging temperature protection circuit as described in any one of claims 1 to 9.

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