Sodium ion start-stop battery

Abstract

The utility model discloses a sodium ion start-stop battery, and relates to the technical field of start-stop power supplies. The sodium ion start-stop battery includes: a substrate; the sodium ion battery pack comprises a plurality of groups of sodium ion battery cells which are sequentially connected in series; the battery management circuit is arranged on the substrate, the battery management circuit is electrically connected with the sodium ion battery pack, and the battery management circuit is used for detecting the temperature of the sodium ion battery pack; the heating assembly is arranged on the outer side of the sodium ion battery pack, and the battery management circuit is electrically connected with the heating assembly; wherein the battery management circuit is used for controlling the heating assembly to work according to the temperature. The utility model aims to improve the working stability of the start-stop battery.

Description

Technical Field

[0001] The utility model relates to the technical field of start-stop power supplies, in particular to a sodium ion start-stop battery. Background Art

[0002] The Stop-Start battery system is a technology that extends the traditional start-stop function, allowing the vehicle to shut down the engine while parked and quickly restart it when needed. This system is designed to further reduce fuel consumption and exhaust emissions, especially during long waits or temporary stops. The Stop-Start system places high demands on the battery, as it not only needs to support frequent start-stop operations but also needs to provide power to all of the vehicle's electrical devices, including the entertainment system and air conditioning, while the engine is off.

[0003] Prior art typically uses lead-acid or lithium batteries as battery packs for stop-start systems. Lead-acid batteries suffer from low energy density, short cycle life, and environmental concerns, while lithium batteries suffer from poor low-temperature performance, poor low-voltage start-stop performance, and high costs. Sodium-ion batteries offer a superior foundation for use. However, temperature still affects the charge and discharge of sodium-ion batteries. Utility Model Content

[0004] The main purpose of the utility model is to provide a sodium ion start-stop battery, aiming to improve the working stability of the start-stop battery.

[0005] To achieve the above-mentioned purpose, the present invention proposes a sodium ion start-stop battery, which comprises:

[0006] substrate;

[0007] A sodium ion battery pack, comprising a plurality of sodium ion cells connected in series;

[0008] a battery management circuit, the battery management circuit being disposed on the substrate, the battery management circuit being electrically connected to the sodium-ion battery pack, and the battery management circuit being configured to detect a temperature of the sodium-ion battery pack;

[0009] a heating assembly, the heating assembly being disposed outside the sodium-ion battery pack and electrically connected to the battery management circuit;

[0010] Wherein, the battery management circuit is used to control the operation of the heating component according to the temperature.

[0011] In one embodiment, the battery management circuit includes:

[0012] Main control circuit;

[0013] a detection circuit, wherein an output end of the detection circuit is electrically connected to the main control circuit, and the detection circuit is used to detect a signal;

[0014] a charging protection circuit, wherein a first end of the charging protection circuit is electrically connected to the negative terminal of the sodium-ion start-stop battery, a second end of the charging protection circuit is electrically connected to the negative electrode of the sodium-ion battery pack, and a controlled end of the charging protection circuit is electrically connected to the main control circuit;

[0015] The main control circuit is used to control the charging protection circuit to open or disconnect the path between the negative terminal of the sodium ion start-stop battery and the negative electrode of the sodium ion battery pack according to the detection signal.

[0016] In one embodiment, the battery management circuit further includes a drive circuit, the input end of the drive circuit is electrically connected to the main control circuit, the output end of the drive circuit is electrically connected to the controlled end of the charging protection circuit, and the drive circuit is used to drive the charging protection circuit to turn on or off the path between the negative end of the sodium-ion start-stop battery and the negative electrode of the sodium-ion battery pack.

[0017] In one embodiment, the detection circuit further includes:

[0018] a voltage detection circuit, wherein a first end of the voltage detection circuit is electrically connected to the sodium ion battery pack, a second end of the voltage detection circuit is electrically connected to the main control circuit, and the voltage detection circuit is used to output a voltage detection signal;

[0019] a current detection circuit, wherein a first end of the current detection circuit is electrically connected to the sodium ion battery pack, a second end of the current detection circuit is electrically connected to the main control circuit, and the current detection circuit is used to output a current detection signal;

[0020] A temperature detection circuit, wherein the output end of the temperature detection circuit is electrically connected to the main control circuit, and the temperature detection circuit is used to output a temperature detection signal.

[0021] In one embodiment, the battery management circuit further includes a DC voltage conversion circuit, the input end of the DC voltage conversion circuit is electrically connected to the positive electrode of the sodium ion battery pack, the output end of the DC voltage conversion circuit is electrically connected to the main control circuit, and the DC voltage conversion circuit is used to convert the input first DC voltage into a second DC voltage and output it.

[0022] In one embodiment, the charge and discharge voltage range of the sodium ion battery cell is 1.8V to 4V.

[0023] In one embodiment, the sodium-ion start-stop battery further includes a current limiting and voltage limiting protection circuit, which is connected in series to the negative electrode of the sodium-ion battery pack and the negative end of the sodium-ion start-stop battery, and is used to fuse when the current and / or voltage flowing through itself reaches a preset threshold.

[0024] In one embodiment, the sodium-ion start-stop battery further includes a plurality of buffer components, and the plurality of buffer components are respectively arranged between the sodium-ion battery pack, the substrate and the casing.

[0025] The technical solution of this utility model improves the stability of battery operation by using a sodium ion battery pack as a start-stop power supply. Secondly, by using a battery management circuit to detect the temperature of the sodium ion battery pack, it is confirmed whether the current temperature of the sodium ion battery pack is at a suitable operating temperature. When the current temperature of the sodium ion battery pack is lower than the suitable operating temperature, the battery management circuit will control the heating component to heat the sodium ion battery pack to bring it to the suitable operating temperature. After the temperature of the sodium ion battery pack reaches the suitable operating temperature, the heating component is controlled to stop heating. In this way, the stability of the start-stop battery operation can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0027] Figure 1 This is a schematic structural diagram of the sodium ion start-stop battery of the utility model;

[0028] Figure 2 This is a module schematic diagram of an embodiment of the sodium ion start-stop battery of the present utility model;

[0029] Figure 3 This is a circuit diagram of another embodiment of the sodium ion start-stop battery of the present utility model.

[0030] Description of Figure Numbers:

[0031] 10. Sodium-ion battery pack; 20. Battery management circuit; 21. Main control circuit; 22. Detection circuit; 23. Charging protection circuit; 24. Drive circuit; 25. DC voltage conversion circuit; 30. Heating component.

[0032] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] 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.

[0034] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In addition, the descriptions of "first," "second," etc. in this utility model are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0036] The Stop-Start battery system is a technology that extends the traditional start-stop function, allowing the vehicle to shut down the engine while parked and quickly restart it when needed. This system is designed to further reduce fuel consumption and exhaust emissions, especially during long waits or temporary stops. The Stop-Start system places high demands on the battery, as it not only needs to support frequent start-stop operations but also needs to provide power to all of the vehicle's electrical devices, including the entertainment system and air conditioning, while the engine is off.

[0037] Prior art typically uses lead-acid or lithium batteries as battery packs for stop-start systems. Lead-acid batteries suffer from low energy density, short cycle life, and environmental concerns, while lithium batteries suffer from poor low-temperature performance, poor low-voltage start-stop performance, and high costs. Sodium-ion batteries offer a superior foundation for use. However, temperature still affects the charge and discharge of sodium-ion batteries.

[0038] Therefore, reference Figures 1 to 3 The present invention provides a sodium ion start-stop battery, which includes:

[0039] substrate;

[0040] A sodium ion battery pack 10, wherein the sodium ion battery pack 10 comprises a plurality of sodium ion cells connected in series;

[0041] a battery management circuit 20 , the battery management circuit 20 being disposed on the substrate and electrically connected to the sodium-ion battery pack 10 , and configured to detect the temperature of the sodium-ion battery pack 10 ;

[0042] a heating assembly 30 , the heating assembly 30 being disposed outside the sodium-ion battery pack 10 and electrically connected to the battery management circuit 20 ;

[0043] The battery management circuit 20 is used to control the operation of the heating component 30 according to the temperature.

[0044] As is understandable, the positive and negative electrode materials used in sodium-ion batteries typically include sodium-based compounds, such as layered oxides and Prussian blue compounds. Compared to lithium-based materials, these materials are more widely available and cause less environmental pollution during extraction and processing. Furthermore, sodium is much more abundant in the Earth's crust than lithium, meaning that raw materials for sodium-ion batteries are more readily available, reducing reliance on rare metals, lowering supply chain risks, and lowering costs. This makes the sodium-ion battery pack 10, which utilizes sodium-ion cells in start-stop batteries, a sustainable development advantage. Sodium-ion batteries typically have a cycle life of over 3,000 cycles. This means that with one charge-discharge cycle per day, a sodium-ion battery can last approximately 8.2 years. However, since some days of the year may not undergo a complete charge-discharge cycle, the actual service life may be even longer, approaching 10 years. Compared to traditional lead-core batteries, sodium-ion batteries have a service life several times longer. Furthermore, sodium-ion batteries exhibit excellent low-temperature characteristics. First, they exhibit excellent low-temperature discharge performance without significant capacity loss. For start-stop batteries, the main reason why cars cannot ignite due to low temperatures in cold seasons, especially in the winter in the north, is that the voltage platform of the battery system is low at low temperatures and cannot meet the ignition voltage platform for car start-stop. The second reason is that it can still be charged when the temperature is below zero. It is understandable that the vehicle will charge the battery after the ignition is completed, but for lead-acid batteries and lithium batteries, low-temperature charging will cause internal crystallization, affecting the cycle life of the battery system and reducing the safety system coefficient of the battery cell. This does not happen with sodium-ion batteries, so using sodium-ion batteries as start-stop batteries is more compatible with more application environments.

[0045] Furthermore, by connecting multiple sodium-ion cells in series, the output voltage can be increased. For example, if the output voltage of a single cell is 2V, the output voltage of two cells connected in series is 4V.

[0046] In this embodiment, the battery management circuit 20 is disposed on a substrate, which is in turn disposed on one side of the sodium-ion battery pack 10. The battery management circuit 20 monitors the temperature of the sodium-ion battery pack 10 via a built-in temperature sensor, thereby confirming whether the current temperature of the sodium-ion battery pack 10 is suitable for charging and discharging operations, thereby controlling other corresponding components to perform corresponding operations. It will be understood that the power supply terminal of the battery management circuit 20 is electrically connected to the sodium-ion battery pack 10, meaning that the power supply of the battery management circuit 20 comes from the sodium-ion battery pack 10. To avoid excessive consumption of the power in the sodium-ion battery pack 10, the battery management circuit 20 enters a low-power mode when the vehicle is not in operation, monitoring only basic battery status.

[0047] In this embodiment, the heating component 30 can be implemented by a heating resistor wire, a PTC heater, or a built-in heating sheet. Among them, the heating component 30 is taken as an example of a heating resistor wire. The heating resistor wire is arranged inside or around the battery pack, and the battery management circuit 20 controls whether it is powered on, thereby controlling whether it generates heat. Furthermore, when the battery management circuit 20 detects through a temperature sensor that the temperature of the sodium-ion battery pack 10 is lower than a preset value, the battery management circuit 20 will control the heating resistor wire to be powered on, and detect through a temperature sensor whether the temperature of the sodium-ion battery pack 10 reaches a temperature suitable for the operation of the sodium-ion battery pack 10, thereby controlling the heating resistor wire to be powered off to avoid the temperature of the sodium-ion battery pack 10 being too high.

[0048] In this embodiment, a sodium ion battery pack is used as a start-stop power supply to improve the stability of the battery operation. Secondly, the battery management circuit 20 is used to detect the temperature of the sodium ion battery pack 10 to confirm whether the current temperature of the sodium ion battery pack 10 is at a suitable operating temperature. When the current temperature of the sodium ion battery pack 10 is lower than the suitable operating temperature, the battery management circuit 20 controls the heating component 30 to heat the sodium ion battery pack 10 to reach the suitable operating temperature. After the temperature of the sodium ion battery pack 10 reaches the suitable operating temperature, the heating component 30 is controlled to stop heating. In this way, the stability of the start-stop battery operation can be effectively improved.

[0049] refer to Figure 2 and Figure 3 In one embodiment of the present invention, the battery management circuit 20 includes:

[0050] Main control circuit 21;

[0051] a detection circuit 22, wherein an output end of the detection circuit 22 is electrically connected to the main control circuit 21, and the detection circuit 22 is used to detect signals;

[0052] A charging protection circuit 23, wherein a first end of the charging protection circuit 23 is electrically connected to the negative end of the sodium-ion start-stop battery, a second end of the charging protection circuit 23 is electrically connected to the negative electrode of the sodium-ion battery pack 10, and a controlled end of the charging protection circuit 23 is electrically connected to the main control circuit 21;

[0053] The main control circuit 21 is used to control the charging protection circuit 23 to open or close the path between the negative terminal of the sodium ion start-stop battery and the negative electrode of the sodium ion battery pack 10 according to the detection signal.

[0054] In this embodiment, the main control circuit 21 can be implemented by a main controller, such as SOC (System On Chip), MCU (Microcontroller Unit), DSP (Digital Signal Process), FPGA (Field Programmable Gate Array), etc.

[0055] In this embodiment, the detection circuit 22 includes: a voltage detection circuit 22, wherein the first end of the voltage detection circuit 22 is electrically connected to the sodium ion battery pack 10, the second end of the voltage detection circuit 22 is electrically connected to the main control circuit 21, and the voltage detection circuit 22 is used to output a voltage detection signal; a current detection circuit 22, wherein the first end of the current detection circuit 22 is electrically connected to the sodium ion battery pack 10, the second end of the current detection circuit 22 is electrically connected to the main control circuit 21, and the current detection circuit 22 is used to output a current detection signal; and a temperature detection circuit 22, wherein the output end of the temperature detection circuit 22 is electrically connected to the main control circuit 21, and the temperature detection circuit 22 is used to output a temperature detection signal. The voltage detection circuit 22 can use a voltage divider resistor circuit, an isolation amplifier circuit, a voltage follower circuit, etc. to detect the voltage of the sodium ion battery pack 10. Further, the voltage of the sodium ion battery pack 10 includes input voltage, output voltage, and cell voltage. The current detection circuit 22 can use a shunt resistor circuit, a current mutual induction circuit, etc. to detect the current of the sodium ion battery. Furthermore, the current of the sodium ion battery pack 10 includes input current and output current. The temperature detection circuit 22 can be implemented using a detection circuit 22 based on a thermistor, such as a resistance divider circuit based on an NTC resistor or an NTC probe, or a resistance divider circuit based on a PTC resistor or a PTC probe. Optionally, the temperature detection circuit 22 can also be implemented using a temperature sensor, such as an infrared temperature sensor, a thermocouple temperature sensor, etc. Among them, there can be multiple temperature detection circuits 22, and multiple temperature detection circuits 22 can be arranged at different positions of the sodium ion battery pack 10. The main control circuit 21 can determine multiple temperature values ​​based on multiple temperature detection signals, and calculate the actual ambient temperature through a preset temperature algorithm, such as an average value, a weighted calculation, etc., thereby improving the accuracy of the detection of the ambient temperature of the sodium ion battery.

[0056] In this embodiment, the charging protection circuit 23 can be implemented using a switching circuit, which can be implemented using at least one switching transistor, such as a MOS transistor, IGBT transistor, thyristor, triode, power transistor, etc. When the detection circuit 22 detects that the sodium-ion battery pack 10 is in a charging state, it monitors the voltage of each battery cell or battery pack to ensure that it does not exceed the set maximum voltage limit. When the battery voltage approaches the full charge voltage, the main control circuit 21 controls the charging protection circuit 23 to disconnect the path between the negative terminal of the sodium-ion start-stop battery and the negative electrode of the sodium-ion battery pack 10, thereby stopping the charging of the sodium-ion battery. The detection circuit 22 also monitors the charging current flowing into the battery. If the current is detected to be too high, it may cause battery overheating or other damage. In this case, the main control circuit 21 controls the charging protection circuit 23 to disconnect the path between the negative terminal of the sodium-ion start-stop battery and the negative electrode of the sodium-ion battery pack 10.

[0057] refer to Figure 2 In one embodiment of the present utility model, the battery management circuit 20 further includes a drive circuit 24, an input end of the drive circuit 24 is electrically connected to the main control circuit 21, and an output end of the drive circuit 24 is electrically connected to the controlled end of the charging protection circuit 23, and the drive circuit 24 is used to drive the charging protection circuit 23 to connect or disconnect the path between the negative terminal of the sodium-ion start-stop battery and the negative electrode of the sodium-ion battery pack 10.

[0058] In this embodiment, when the charging protection circuit 23 is implemented using a MOS transistor, a parasitic capacitance exists between the gate and source of the MOS transistor. This capacitance needs to be charged and discharged in order to turn the MOS transistor on or off. The main control circuit 21, through the driver circuit 24, can provide sufficient current for rapid charging and discharging, thereby ensuring that the gate voltage of the MOS transistor quickly reaches the required on- or off-voltage. The gate of the MOS transistor requires a certain drive current to change its state. In high-frequency applications, in particular, the gate capacitance needs to be quickly charged and discharged, which requires the driver circuit 24 to provide sufficient current. The main control circuit 21 is generally unable to provide such a large current, so a dedicated driver circuit 24 is required to amplify the control signal. Furthermore, the driver circuit 24 typically includes protection features such as overcurrent protection, overheat protection, and undervoltage lockout. These protection features ensure that the MOS transistor is not damaged under abnormal conditions. The main control circuit 21, through the driver circuit 24, can better control and protect the MOS transistor.

[0059] refer to Figure 2 In one embodiment of the present utility model, the battery management circuit 20 further includes a DC voltage conversion circuit 25, the input end of the DC voltage conversion circuit 25 is electrically connected to the positive electrode of the sodium ion battery pack 10, and the output end of the DC voltage conversion circuit 25 is electrically connected to the main control circuit 21, and the DC voltage conversion circuit 25 is used to convert the input first DC voltage into a second DC voltage and output it.

[0060] In this embodiment, the DC voltage conversion circuit 25 can be implemented using a step-down circuit (the average output voltage is always lower than the average input voltage), a step-up / step-down circuit (the average output voltage can be either lower or higher than the average input voltage), a step-up circuit (the average output voltage is always higher than the average input voltage), or a Chuck circuit (a step-up / step-down circuit with continuous input and output currents and low harmonic components), depending on the actual application scenario. It is understood that the power supply of the battery management circuit 20 is electrically connected to the positive electrode of the sodium-ion battery pack 10, that is, the sodium-ion battery pack 10 supplies power to the battery management circuit 20. Therefore, the input voltage of the main control circuit 21 and the output voltage of the sodium-ion battery pack 10 must correspond to each other in order to achieve a power supply relationship between the two. Therefore, a set of DC voltage conversion circuits 25 needs to be connected in series between the power supply terminal of the main control circuit 21 and the positive electrode of the sodium-ion battery pack 10 to enable the sodium-ion battery pack 10 to supply power to the main control circuit 21.

[0061] In one embodiment of the present invention, the charge and discharge voltage range of the sodium ion battery is 1.8V to 4V.

[0062] In this embodiment, when the voltage range of the sodium ion battery cell is 1.8V to 4V and the number of battery cells is 4, the overall charge and discharge voltage platform is 7.2V to 16V. Compared with the voltage platform (10V to 14V) of the start-stop battery of a general passenger car, the sodium ion battery pack 10 has a wider voltage range. This means that during the discharge process, the system can be designed to be more flexible because the sodium ion battery itself has a large voltage floating space. In this case, the discharge protection circuit can be canceled and only the charging protection circuit 23 can be retained for charging protection. Because the discharge voltage range of the sodium ion battery is relatively large, this means that in most cases, the battery will not easily reach the voltage threshold that requires protection. Therefore, the battery voltage can be monitored by a software algorithm without the need for hardware discharge protection. The discharge protection circuit is removed to simplify the circuit design, reduce the number of components, thereby reducing costs, and improving the reliability and efficiency of the system.

[0063] In one embodiment of the present invention, the sodium ion start-stop battery further includes a current limiting and voltage limiting protection circuit, which is connected in series to the negative electrode of the sodium ion battery pack 10 and the negative end of the sodium ion start-stop battery, and is used to fuse when the current and / or voltage flowing through itself reaches a preset threshold.

[0064] In this embodiment, the current-limiting and voltage-limiting protection circuit can be implemented using a three-terminal fuse, or a fusible fuse and a voltage-stabilizing diode. When the current-limiting and voltage-limiting protection circuit is implemented using a three-terminal fuse, when the charging current exceeds the rated value, the fusible alloy inside the three-terminal fuse will melt, quickly disconnecting the circuit and achieving overcurrent protection. When the charging voltage is too high, the battery management circuit 20 can output a protection signal after detecting the overvoltage, driving the transistor in the three-terminal fuse, causing the heater to start heating, ultimately causing the fuse to melt and achieve overvoltage protection.

[0065] In one embodiment of the present invention, the sodium-ion start-stop battery further includes a plurality of buffer components, and the plurality of buffer components are respectively arranged between the sodium-ion battery pack 10, the substrate and the housing.

[0066] It is understandable that the sodium-ion battery pack 10 is not directly fitted to the outer shell of the sodium-ion start-stop battery. Because the outer shell of the sodium-ion start-stop battery usually adopts an IP65 injection-molded shell to have the ability to be completely dust-proof and prevent the intrusion of jet water. In addition, the sodium-ion start-stop battery may be slightly bumped during transportation or maintenance, causing the shell to deform. Therefore, by reserving some space between the sodium-ion battery and the shell, the problem of deformation of the sodium-ion battery caused by external force impact can be better avoided. Among them, in order to achieve fixation between the sodium-ion battery and the shell, multiple components with buffering function are required to block and fix them. For example, buffering foam and foaming agent are used to achieve this.

[0067] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A sodium ion start-stop battery, characterized in that: The sodium ion start-stop battery comprises: substrate; A sodium ion battery pack, comprising a plurality of sodium ion cells connected in series; a battery management circuit, the battery management circuit being disposed on the substrate, the battery management circuit being electrically connected to the sodium-ion battery pack, and the battery management circuit being configured to detect a temperature of the sodium-ion battery pack; a heating assembly, the heating assembly being disposed outside the sodium-ion battery pack and electrically connected to the battery management circuit; Wherein, the battery management circuit is used to control the operation of the heating component according to the temperature.

2. The sodium ion start-stop battery according to claim 1, characterized in that The battery management circuit includes: Main control circuit; a detection circuit, wherein an output end of the detection circuit is electrically connected to the main control circuit, and the detection circuit is used to detect a signal; a charging protection circuit, wherein a first end of the charging protection circuit is electrically connected to the negative terminal of the sodium-ion start-stop battery, a second end of the charging protection circuit is electrically connected to the negative electrode of the sodium-ion battery pack, and a controlled end of the charging protection circuit is electrically connected to the main control circuit; The main control circuit is used to control the charging protection circuit to open or disconnect the path between the negative terminal of the sodium ion start-stop battery and the negative electrode of the sodium ion battery pack according to the detection signal.

3. The sodium ion start-stop battery according to claim 2, characterized in that The battery management circuit also includes a drive circuit, the input end of the drive circuit is electrically connected to the main control circuit, and the output end of the drive circuit is electrically connected to the controlled end of the charging protection circuit. The drive circuit is used to drive the charging protection circuit to open or disconnect the path between the negative end of the sodium ion start-stop battery and the negative electrode of the sodium ion battery pack.

4. The sodium ion start-stop battery according to claim 2, characterized in that The detection circuit comprises: a voltage detection circuit, wherein a first end of the voltage detection circuit is electrically connected to the sodium ion battery pack, a second end of the voltage detection circuit is electrically connected to the main control circuit, and the voltage detection circuit is used to output a voltage detection signal; a current detection circuit, wherein a first end of the current detection circuit is electrically connected to the sodium ion battery pack, a second end of the current detection circuit is electrically connected to the main control circuit, and the current detection circuit is used to output a current detection signal; A temperature detection circuit, wherein the output end of the temperature detection circuit is electrically connected to the main control circuit, and the temperature detection circuit is used to output a temperature detection signal.

5. The sodium ion start-stop battery according to claim 2, characterized in that The battery management circuit also includes a DC voltage conversion circuit, the input end of the DC voltage conversion circuit is electrically connected to the positive electrode of the sodium ion battery pack, the output end of the DC voltage conversion circuit is electrically connected to the main control circuit, and the DC voltage conversion circuit is used to convert the input first DC voltage into a second DC voltage and output it.

6. The sodium ion start-stop battery according to claim 2, characterized in that The charge and discharge voltage range of the sodium ion battery is 1.8V to 4V.

7. The sodium ion start-stop battery according to claim 1, characterized in that The sodium ion start-stop battery also includes a current limiting and voltage limiting protection circuit, which is connected in series to the negative electrode of the sodium ion battery pack and the negative end of the sodium ion start-stop battery, and is used to fuse when the current and / or voltage flowing through itself reaches a preset threshold.

8. The sodium ion start-stop battery according to claim 1, wherein The sodium-ion start-stop battery further includes a plurality of buffer components, which are respectively arranged between the sodium-ion battery pack, the substrate and the shell.

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