Battery management system of sodium ion battery and electronic equipment

Abstract

The utility model relates to a battery management system of a sodium ion battery and electronic equipment. The battery management system of the sodium ion battery comprises a first battery management circuit, a first charging and discharging circuit, a first sampling circuit and a second battery management circuit, wherein the control end of the first battery management circuit is connected with the first end of the first charging and discharging circuit, the second end of the first charging and discharging circuit is connected with a first load, and the third end of the first charging and discharging circuit is connected with the first end of the first sampling circuit; the second end of the first sampling circuit is connected with the sampling end of the second battery management circuit; wherein when the first battery management circuit is in a working state and the second battery management circuit is in an idle state, the first battery management circuit detects the running voltage and the running current of the first charging and discharging circuit; the second battery management circuit obtains the conversion efficiency of the first charging and discharging circuit through the first sampling circuit.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of battery, more specifically, the utility model relates to a battery management system and electronic equipment of sodium ion battery. BACKGROUND

[0002] With the rapid development of sodium ion battery, sodium ion battery is not only high safety, and is friendly to the environment. In the prior art, the battery management circuit can usually manage the voltage, temperature and power of the corresponding battery and other parameters, but when some battery management circuits corresponding to the battery do not charge and discharge, these battery management circuits are idle, and the utilization efficiency is low. SUMMARY

[0003] One object of the utility model is to provide a battery management system and electronic equipment of sodium ion battery.

[0004] According to one aspect of the utility model, a battery management system of sodium ion battery is provided, the system includes first battery management circuit, first charge and discharge circuit, first sampling circuit and second battery management circuit;

[0005] The control end of the first battery management circuit is connected with the first end of the first charge and discharge circuit, the second end of the first charge and discharge circuit is connected with the first load, the third end of the first charge and discharge circuit is connected with the first end of the first sampling circuit, and the second end of the first sampling circuit is connected with the sampling end of the second battery management circuit.

[0006] When the first battery management circuit is in the working state and the second battery management circuit is in the idle state, the first battery management circuit detects the operating voltage and operating current of the first charge and discharge circuit, and the second battery management circuit obtains the conversion efficiency of the first charge and discharge circuit through the first sampling circuit.

[0007] Optionally, the first charge and discharge circuit includes a first sodium battery and a first DC / DC conversion circuit.

[0008] The first end of the first sodium battery is connected with the control end of the first battery management circuit, the second end of the first sodium battery is connected with the first end of the first DC / DC conversion circuit, and the second end of the first DC / DC conversion circuit is connected with the first load.

[0009] Optionally, the first DC / DC conversion circuit includes a first switch tube, a second switch tube, a third switch tube and a fourth switch tube.

[0010] The connection point of the source of the first switch tube and the source of the third switch tube is connected with the second end positive electrode of the first sodium battery, the connection point of the drain of the second switch tube and the drain of the fourth switch tube is connected with the second end negative electrode of the first sodium battery, the connection point of the drain of the first switch tube and the source of the second switch tube is connected with the first load positive electrode, and the connection point of the drain of the third switch tube and the source of the fourth switch tube is connected with the first load negative electrode.

[0011] Optionally, the first sampling circuit comprises a second sampling circuit and a third sampling circuit; the third end of the first charge-discharge circuit is the first end of the first DC / DC conversion circuit and the second end of the first DC / DC conversion circuit.

[0012] The first end of the second sampling circuit is connected with the first end of the first DC / DC conversion circuit, and the second end of the second sampling circuit is connected with the sampling end of the second battery management circuit; the first end of the third sampling circuit is connected with the second end of the first DC / DC conversion circuit, and the second end of the third sampling circuit is connected with the sampling end of the second battery management circuit.

[0013] Optionally, the second sampling circuit comprises a first resistor, a first digital-to-analog conversion module and a first communication module; the first end of the first resistor is connected with the first end of the first DC / DC conversion circuit, the second end of the first resistor is connected with the first end of the first digital-to-analog conversion module, the second end of the first digital-to-analog conversion module is connected with the first end of the first communication module, and the first communication module is used to be connected with the sampling end of the second battery management circuit.

[0014] The third sampling circuit comprises a second resistor, a second digital-to-analog conversion module and a second communication module; the first end of the second resistor is connected with the second end of the first DC / DC conversion circuit, the second end of the second resistor is connected with the first end of the second digital-to-analog conversion module, the second end of the second digital-to-analog conversion module is connected with the first end of the second communication module, and the second communication module is used to be connected with the sampling end of the second battery management circuit.

[0015] Optionally, the system further comprises a second charge-discharge circuit; the first end of the second charge-discharge circuit is connected with the control end of the second battery management circuit, and the second end of the second charge-discharge circuit is connected with a second load.

[0016] When the second battery management circuit is in a working state, the second battery management circuit detects the operating voltage and the operating current of the second charge-discharge circuit.

[0017] Optionally, the second charge-discharge circuit comprises a second sodium battery and a second DC / DC conversion circuit.

[0018] The first end of the second sodium battery is connected with the control end of the second battery management circuit, the second end of the second sodium battery is connected with the first end of the second DC / DC conversion circuit, and the second end of the second DC / DC conversion circuit is connected with a second load.

[0019] Optionally, the second DC / DC conversion comprises a fifth switch tube, a sixth switch tube, a seventh switch tube, an eighth switch tube, a ninth switch tube and a tenth switch tube.

[0020] The connection point of the source of the fifth switch tube, the source of the seventh switch tube and the ninth switch tube is connected with the positive electrode of the second end of the second sodium battery, the connection point of the drain of the sixth switch tube, the drain of the eighth switch tube and the drain of the tenth switch tube is connected with the negative electrode of the second end of the second sodium battery, the connection point of the drain of the fifth switch tube and the source of the sixth switch tube is connected with the first end of the second load, the connection point of the drain of the seventh switch tube and the source of the eighth switch tube is connected with the second end of the second load, and the connection point of the drain of the ninth switch tube and the source of the tenth switch tube is connected with the third end of the second load.

[0021] Optionally, the system further comprises a control circuit, and the communication end of the first battery management circuit and the communication end of the second battery management circuit are connected with the data transceiver end of the control circuit.

[0022] When the control circuit receives the data about the conversion efficiency of the first charge-discharge circuit sent by the second battery management circuit, the control circuit sends a first control signal to the first battery management circuit, so that the first battery management circuit adjusts the conversion efficiency of the first charge-discharge circuit in response to the first control signal.

[0023] According to one aspect of the present application, an electronic device is provided, which comprises the battery management system of the sodium ion battery as described in the first aspect.

[0024] One technical effect of the present application is that when the first battery management circuit is in a working state and the second battery management circuit is in an idle state, the first battery management circuit detects the operating voltage and operating current of the first charge-discharge circuit, and the second battery management circuit obtains the conversion efficiency of the first charge-discharge circuit through the first sampling circuit, thereby effectively improving the utilization efficiency of the second battery management circuit under the premise of reducing the burden of the first battery management circuit on the management of the first charge-discharge circuit.

[0025] Other features and advantages of the present application will be better understood from the following detailed description of exemplary embodiments thereof, taken in conjunction with the accompanying drawings, which describe the principles of the application. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings, which form a part of the specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application.

[0027] Figure 1 is a structural block diagram of a battery management system of a sodium ion battery in the embodiment of the present application;

[0028] Figure 2 is a circuit diagram of a first conversion circuit in the embodiment of the present application;

[0029] Figure 3 is a circuit diagram of a second conversion circuit in the embodiment of the present application. DETAILED DESCRIPTION

[0030] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions, and numerical values set forth in these embodiments are not limiting to the scope of the present application unless otherwise specifically stated.

[0031] The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the scope of the present application and its applications or uses.

[0032] Techniques and devices known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered as part of the specification, where appropriate.

[0033] In all of the examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as a limitation. Thus, other examples of exemplary embodiments can have different values.

[0034] It should be noted that like references and characters herein relate to like items throughout the figures, and once an item is defined in one figure, it need not be discussed further in subsequent figures.

[0035] Figure 1 is a structural block diagram of a battery management system of a sodium ion battery in the embodiment of the present application. As shown in the figure, the system includes a first battery management circuit 11, a first charge-discharge circuit, a first sampling circuit, and a second battery management circuit 21; Figure 1

[0036] ​The control end of the first battery management circuit 11 is connected with the first end of the first charge-discharge circuit, the second end of the first charge-discharge circuit is connected with the first load 16, the third end of the first charge-discharge circuit is connected with the first end of the first sampling circuit, and the second end of the first sampling circuit is connected with the sampling end of the second battery management circuit 21.

[0037] When the first battery management circuit 11 is in the working state and the second battery management circuit 21 is in the idle state, the first battery management circuit 11 detects the operating voltage and the operating current of the first charge-discharge circuit, and the second battery management circuit 21 obtains the conversion efficiency of the first charge-discharge circuit through the first sampling circuit.

[0038] In the embodiment, the first battery management circuit 11 is a control chip, which can detect the operating voltage, the operating current and the operating temperature of the first charge-discharge circuit.

[0039] In the embodiment, the first charge-discharge circuit can be a circuit for outputting direct current to the load, or can be charged through the load.

[0040] In the embodiment, the second battery management circuit 21 can also be a control chip, and the first battery management circuit 11 and the second battery management circuit 21 both have a communication module, so that the second battery management circuit 21 can receive the data about the conversion efficiency of the first charge-discharge circuit fed back by the first sampling circuit.

[0041] In other words, the battery management system of the sodium-ion battery can detect the operating voltage and the operating current of the first charge-discharge circuit when the first battery management circuit 11 is in the working state and the second battery management circuit 21 is in the idle state, and the second battery management circuit 21 obtains the conversion efficiency of the first charge-discharge circuit through the first sampling circuit, thereby effectively improving the utilization efficiency of the second battery management circuit 21 while reducing the burden of the first battery management circuit 11 on managing the first charge-discharge circuit.

[0042] In some embodiments, as shown in FIG. 1, the first charge-discharge circuit includes a first sodium battery 12 and a first direct current / direct current conversion circuit 13. Figure 2

[0043] The first end of the first sodium battery 12 is connected with the control end of the first battery management circuit 11, the second end of the first sodium battery 12 is connected with the first end of the first direct current / direct current conversion circuit 13, and the second end of the first direct current / direct current conversion circuit 13 is connected with the first load 16.

[0044] ​In the embodiment, the first sodium battery 12 can be converted into direct current by the first direct current / direct current conversion circuit 13, so that the converted direct current can be output to the first load 16 to power the first load 16.

[0045] In the embodiment, the first load 16 can also output direct current, and the converted direct current can charge the first sodium battery 12 after conversion by the first direct current / direct current conversion circuit 13.

[0046] In some embodiments, as shown in Figure 2 To realize the charging and discharging of the first sodium battery 12, the first direct current / direct current conversion circuit 13 includes a first switch tube Q1, a second switch tube Q2, a third switch tube Q3 and a fourth switch tube Q4.

[0047] The connection point of the source of the first switch tube Q1 and the source of the third switch tube Q3 is connected to the positive electrode of the second end of the first sodium battery 12, the connection point of the drain of the second switch tube Q2 and the drain of the fourth switch tube Q4 is connected to the negative electrode of the second end of the first sodium battery 12, the connection point of the drain of the first switch tube Q1 and the source of the second switch tube Q2 is connected to the positive electrode of the first load 16, and the connection point of the drain of the third switch tube Q3 and the source of the fourth switch tube Q4 is connected to the negative electrode of the first load 16 of the system.

[0048] In the embodiment, the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 are MOS tubes, the second switch tube Q2 and the third switch tube Q3 are turned off when the first switch tube Q1 and the fourth switch tube Q4 are turned on, and the second switch tube Q2 and the third switch tube Q3 are turned on when the first switch tube Q1 and the fourth switch tube Q4 are turned off. That is, the first switch tube Q1 and the fourth switch tube Q4 are the first group of switch tubes, and the second switch tube Q2 and the third switch tube Q3 are the second group of switch tubes. The two groups of switch tubes are turned on alternately to convert the direct current output by the first sodium battery 12 into direct current that can be used by the first load 16.

[0049] In some embodiments, as shown in Figure 1 The first sampling circuit includes a second sampling circuit 14 and a third sampling circuit 15, and the third end of the first charging and discharging is the first end of the first direct current / direct current conversion circuit 13 and the second end of the first direct current / direct current conversion circuit 13.

[0050] The first end of the second sampling circuit 14 is connected to the first end of the first direct current / direct current conversion circuit 13, and the second end of the second sampling circuit 14 is connected to the sampling end of the second battery management circuit 21. The first end of the third sampling circuit 15 is connected to the second end of the first direct current / direct current conversion circuit 13, and the second end of the third sampling circuit 15 is connected to the sampling end of the second battery management circuit 21.

[0051] In other words, by setting the second sampling circuit 14 and the third sampling circuit 15, the voltage or current across the first DC / DC conversion circuit 13 can be collected when the first sodium battery 12 is discharging, and the voltage or current across the first DC / DC conversion circuit 13 can also be collected when the first sodium battery 12 is charging, so as to realize real-time adjustment of the conversion efficiency of the first DC / DC conversion circuit 13, thereby making the charging and discharging of the first sodium battery 12 more stable.

[0052] In some embodiments, in order to realize sampling of the first DC / DC conversion circuit 13 by the second sampling circuit 14 and the third sampling circuit 15, the second sampling circuit 14 includes a first resistor, a first digital-to-analog conversion module, and a first communication module, a first end of the first resistor is connected with a first end of the first DC / DC conversion circuit 13, a second end of the first resistor is connected with a first end of the first digital-to-analog conversion module, a second end of the first digital-to-analog conversion module is connected with a first end of the first communication module, and the first communication module is used to connect with a sampling end of the second battery management circuit 21.

[0053] The third sampling circuit 15 includes a second resistor, a second digital-to-analog conversion module, and a second communication module, a first end of the second resistor is connected with a second end of the first DC / DC conversion circuit 13, a second end of the second resistor is connected with a first end of the second digital-to-analog conversion module, a second end of the second digital-to-analog conversion module is connected with a first end of the second communication module, and the second communication module is used to connect with the sampling end of the second battery management circuit 21.

[0054] In other words, by setting the first digital-to-analog conversion module, the collected analog signal on the first DC / DC conversion circuit 13 can be converted into a digital signal, and sent to the second battery management circuit 21 through the first communication module. By setting the second digital-to-analog conversion module, the collected analog signal on the first DC / DC conversion circuit 13 can be converted into a digital signal, and sent to the second battery management circuit 21 through the second communication module.

[0055] In some embodiments, in order to improve the utilization efficiency of the second battery management circuit 21, the system further includes a second charging and discharging circuit, a first end of the second charging and discharging circuit is connected with a control end of the second battery management circuit 21, and a second end of the second charging and discharging circuit is connected with the second load 24 of the system.

[0056] When the second battery management circuit 21 is in a working state, the second battery management circuit 21 detects the operating voltage and the operating current of the second charging and discharging circuit.

[0057] In other words, by setting the second charging and discharging circuit, direct current can be provided for the second load 24, thereby improving the utilization efficiency of the second battery management circuit 21.

[0058] In some embodiments, the second charge-discharge circuit includes a second sodium battery 22 and a second DC / DC conversion circuit 23.

[0059] The first end of the second sodium battery 22 is connected to the control end of the second battery management circuit 21, the second end of the second sodium battery 22 is connected to the first end of the second DC / DC conversion circuit 23, and the second end of the second DC / DC conversion circuit 23 is connected to the second load 24.

[0060] In this embodiment, the second sodium battery 22 can be converted by the second DC / DC conversion circuit 23 to output the converted DC power to the second load 24 to power the second load 24.

[0061] In this embodiment, the second load 24 can also output DC power, and after conversion by the second DC / DC conversion circuit 23, the converted DC power can charge the second sodium battery 22.

[0062] In some embodiments, as shown in FIG. 5, to realize the charge and discharge of the second sodium battery 22, the second DC / DC conversion includes a fifth switch tube Q5, a sixth switch tube Q6, a seventh switch tube Q7, an eighth switch tube Q8, a ninth switch tube Q9, and a tenth switch tube Q10. Figure 3

[0063] The connection point of the source of the fifth switch tube Q5, the source of the seventh switch tube Q7, and the source of the ninth switch tube Q9 is connected to the second end positive electrode of the second sodium battery 22, the connection point of the drain of the sixth switch tube Q6, the drain of the eighth switch tube Q8, and the drain of the tenth switch tube Q10 is connected to the second end negative electrode of the second sodium battery 22, the connection point of the drain of the fifth switch tube Q5 and the source of the sixth switch tube Q6 is connected to the first end of the second load 24 of the system, the connection point of the drain of the seventh switch tube Q7 and the source of the eighth switch tube Q8 is connected to the second end of the second load 24 of the system, and the connection point of the drain of the ninth switch tube Q9 and the source of the tenth switch tube Q10 is connected to the third end of the second load 24 of the system.

[0064] ​In the embodiment, the fifth switch tube Q5, the sixth switch tube Q6, the seventh switch tube Q7, the eighth switch tube Q8, the ninth switch tube Q9 and the tenth switch tube Q10 are MOS tubes, the second switch tube Q2 and the third switch tube Q3 are turned off when the first switch tube Q1 and the fourth switch tube Q4 are turned on, the sixth switch tube Q6, the seventh switch tube Q7 and the tenth switch tube Q10 are turned on when the fifth switch tube Q5, the eighth switch tube Q8 and the ninth switch tube Q9 are turned off, that is, the fifth switch tube Q5, the eighth switch tube Q8 and the ninth switch tube Q9 are the third group of switch tubes, the sixth switch tube Q6, the seventh switch tube Q7 and the tenth switch tube Q10 are the fourth group of switch tubes, and the two groups of switch tubes are turned on alternately to convert the direct current output by the second sodium battery 22 into direct current that can be used by the second load 24.

[0065] In some embodiments, the system further comprises a control circuit 31; the communication end of the first battery management circuit 11 and the communication end of the second battery management circuit 21 are connected to the data transceiver end of the control circuit 31.

[0066] The control circuit 31 sends a first control signal to the first battery management circuit 11 when receiving the data about the conversion efficiency of the first charging and discharging circuit sent by the second battery management circuit 21, so that the first battery management circuit 11 adjusts the conversion efficiency of the first charging and discharging circuit in response to the first control signal.

[0067] In the embodiment, the control circuit 31 can be a control chip, which can send the first control signal to the first battery management circuit 11 to change the duty cycle of the first control signal, so that the conversion efficiency of the first charging and discharging circuit is adjusted. The first control signal can be a PWM wave signal.

[0068] According to the electronic device provided in the embodiment of the application, the battery management system of the sodium ion battery in any of the above embodiments is used.

[0069] Although some specific embodiments of the application have been described in detail by examples, those skilled in the art should understand that the above examples are only for illustration, not for limiting the scope of the application. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the application. The scope of the application is defined by the appended claims.

Claims

1. A battery management system for a sodium-ion battery, the battery management system comprising: The system comprises a first battery management circuit, a first charge-discharge circuit, a first sampling circuit and a second battery management circuit; The control end of the first battery management circuit is connected with the first end of the first charge-discharge circuit, the second end of the first charge-discharge circuit is connected with a first load, the third end of the first charge-discharge circuit is connected with the first end of the first sampling circuit, and the second end of the first sampling circuit is connected with the sampling end of the second battery management circuit; When the first battery management circuit is in a working state and the second battery management circuit is in an idle state, the first battery management circuit detects the operating voltage and operating current of the first charge-discharge circuit, and the second battery management circuit obtains the conversion efficiency of the first charge-discharge circuit through the first sampling circuit.

2. The system of claim 1, wherein, The first charge-discharge circuit comprises a first sodium battery and a first DC / DC conversion circuit; The first end of the first sodium battery is connected with the control end of the first battery management circuit, and the second end of the first sodium battery is connected with the first end of the first DC / DC conversion circuit.

3. The system of claim 2, wherein, The first DC / DC conversion circuit comprises a first switch tube, a second switch tube, a third switch tube and a fourth switch tube; The connection point of the source of the first switch tube and the source of the third switch tube is connected with the positive electrode of the second end of the first sodium battery, the connection point of the drain of the second switch tube and the drain of the fourth switch tube is connected with the negative electrode of the second end of the first sodium battery, the connection point of the drain of the first switch tube and the source of the second switch tube is connected with the positive electrode of the first load, and the connection point of the drain of the third switch tube and the source of the fourth switch tube is connected with the negative electrode of the first load.

4. The system of claim 2, wherein, The first sampling circuit comprises a second sampling circuit and a third sampling circuit; the third end of the first charge-discharge circuit is the first end of the first DC / DC conversion circuit and the second end of the first DC / DC conversion circuit; The first end of the second sampling circuit is connected with the first end of the first DC / DC conversion circuit, and the second end of the second sampling circuit is connected with the sampling end of the second battery management circuit; the first end of the third sampling circuit is connected with the second end of the first DC / DC conversion circuit, and the second end of the third sampling circuit is connected with the sampling end of the second battery management circuit.

5. The system of claim 4, wherein, The second sampling circuit comprises a first resistor, a first digital-to-analog conversion module and a first communication module; the first end of the first resistor is connected with the first end of the first DC / DC conversion circuit, the second end of the first resistor is connected with the first end of the first digital-to-analog conversion module, the second end of the first digital-to-analog conversion module is connected with the first end of the first communication module, and the first communication module is used for being connected with the sampling end of the second battery management circuit; The third sampling circuit comprises a second resistor, a second digital-to-analog conversion module and a second communication module, a first end of the second resistor is connected with a second end of the first DC / DC conversion circuit, a second end of the second resistor is connected with a first end of the second digital-to-analog conversion module, a second end of the second digital-to-analog conversion module is connected with a first end of the second communication module, and the second communication module is used for connecting with a sampling end of the second battery management circuit.

6. The system of claim 1, wherein, The system further comprises a second charge-discharge circuit, a first end of the second charge-discharge circuit is connected with a control end of the second battery management circuit, and a second end of the second charge-discharge circuit is connected with a second load. When the second battery management circuit is in a working state, the second battery management circuit detects an operating voltage and an operating current of the second charge-discharge circuit.

7. The system of claim 6, wherein, The second charge-discharge circuit comprises a second sodium battery and a second DC / DC conversion circuit. A first end of the second sodium battery is connected with a control end of the second battery management circuit, a second end of the second sodium battery is connected with a first end of the second DC / DC conversion circuit, and a second end of the second DC / DC conversion circuit is connected with a second load.

8. The system of claim 7, wherein, The second DC / DC conversion circuit comprises a fifth switch tube, a sixth switch tube, a seventh switch tube, an eighth switch tube, a ninth switch tube and a tenth switch tube. A connection point of a source electrode of the fifth switch tube, a source electrode of the seventh switch tube and the ninth switch tube is connected with a second end positive electrode of the second sodium battery, a connection point of a drain electrode of the sixth switch tube, a drain electrode of the eighth switch tube and a drain electrode of the tenth switch tube is connected with a second end negative electrode of the second sodium battery, a connection point of a drain electrode of the fifth switch tube and a source electrode of the sixth switch tube is connected with a first end of the second load, a connection point of a drain electrode of the seventh switch tube and a source electrode of the eighth switch tube is connected with a second end of the second load, and a connection point of a drain electrode of the ninth switch tube and a source electrode of the tenth switch tube is connected with a third end of the second load.

9. The system of claim 1, wherein, The system further comprises a control circuit, a communication end of the first battery management circuit and a communication end of the second battery management circuit are connected with a data transceiver end of the control circuit. When the control circuit receives data about a conversion efficiency of the first charge-discharge circuit sent by the second battery management circuit, the control circuit sends a first control signal to the first battery management circuit, so that the first battery management circuit adjusts the conversion efficiency of the first charge-discharge circuit in response to the first control signal.

10. An electronic device, comprising: The electronic device comprises the battery management system of the sodium ion battery according to any one of claims 1 to 9.

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