Simple SOC status display circuit for sodium ion battery and sodium ion battery module

By setting up multiple display units to electrically connect to the diode in the sodium ion cell SOC measurement, controlling the starting voltage and lighting the light-emitting diode, the problems of reduced SOC measurement accuracy and high cost in the prior art are solved, and a low-cost and convenient SOC status display is achieved.

CN222721636UActive Publication Date: 2025-04-04GUANGDONG HAISIDA NAXING TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202421340255.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-06-12
Publication Date
2025-04-04
Estimated Expiration
2034-06-12

AI Technical Summary

Technical Problem

The prior art has the problem of degradation in the measurement of sodium ion cell SOCs, and the cost is high, making it not suitable for scenarios with simple SOC measurement.

Method used

By setting up multiple display units to electrically connect to the diode, the starting voltage of different display units is controlled to be different, and the light-emitting diodes are sequentially lit at different starting voltages, thereby realizing the display function of the SOC state.

Benefits of technology

The simple, convenient and low-cost display of the SOC state of sodium ion cell is achieved, avoiding the problem of degradation of accuracy.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of sodium batteries, and discloses a simple SOC state display circuit for sodium ion batteries and a sodium ion battery module. The display circuit may include at least two display units and a diode; one end of one of the display units is used to connect to the positive electrode of the sodium ion battery, and the other end is used to connect to the negative electrode of the sodium ion battery, one end of the remaining at least one display unit is connected to one end of the previous display unit, and the other end is connected to the other end of the previous display unit, and the positive electrode of the diode is connected to one end of the previous display unit, and the negative electrode is connected to the next display unit. According to the characteristic that the charging and discharging curve of the sodium ion battery changes nearly linearly, the display circuit controls the starting voltages of different display units to be different, and sequentially lights up the light-emitting diodes at different starting voltages, thereby quickly realizing the display function of the SOC state; and the display circuit has a simple structure, is easy to use, and is low in cost.
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Description

Technical Field

[0001] The utility model relates to the technical field of sodium batteries, and in particular to a sodium ion battery cell simple SOC state display circuit and a sodium ion battery cell module. Background Art

[0002] Sodium-ion batteries are a new type of energy. Sodium is one of the most abundant elements on earth and has similar chemical properties to lithium, so it can also be applied to lithium-ion battery systems. Sodium-ion batteries have many advantages over lithium-ion batteries, such as low cost, good safety, fast charging and discharging speed, steep charging and discharging voltage platform, and nearly linear charging and discharging curves. The mainstream battery cell SOC calculation methods in the prior art include the open circuit voltage method, the ampere-hour integration method, and the extended Kalman filter method; these algorithms have high accuracy and are suitable for occasions with high SOC accuracy requirements. They are expensive and not suitable for simple SOC measurements of sodium-ion batteries. At the same time, these algorithms are prone to a decrease in the accuracy of battery cell SOC measurement in long-term use due to their respective shortcomings. Utility Model Content

[0003] In order to overcome the above technical problems, the embodiment of the utility model provides a simple SOC state display circuit for sodium ion batteries and a sodium ion battery module. The display circuit is based on the characteristic that the charge and discharge curve of the sodium ion battery changes nearly linearly. By setting multiple display units to be electrically connected with diodes, the starting voltages of different display units are controlled to be different. Through the voltage regulator diode, the light-emitting diodes are sequentially lit at different starting voltages, thereby realizing the display function of the SOC state. In addition, the display circuit has a simple structure, is easy to use, and is low in cost.

[0004] In order to achieve the above-mentioned object, the embodiment of the utility model provides a simple SOC state display circuit of a sodium ion battery cell, and the display circuit comprises:

[0005] At least two display units, one end of one of the display units is used to connect to the positive electrode of the sodium ion battery cell, and the other end is used to connect to the negative electrode of the sodium ion battery cell, and one end of the remaining at least one display unit is connected to one end of the previous display unit, and the other end is connected to the other end of the previous display unit, wherein the starting voltage of each of the display units is different;

[0006] A diode, wherein the anode of the diode is connected to one end of the previous display unit, and the cathode of the diode is connected to the next display unit.

[0007] Preferably, the display unit comprises:

[0008] A light emitting diode, wherein the positive electrode of the light emitting diode is connected to one end of the display unit;

[0009] A current limiting resistor, one end of which is connected to the cathode of the light emitting diode, and the other end of which is connected to the other end of the display unit.

[0010] Preferably, starting from the current limiting resistor of the first display unit connected to the sodium ion battery cell, the resistance values ​​of the current limiting resistors of the display units decrease step by step in accordance with the arrangement order of the display units.

[0011] Preferably, the number of the current-limiting resistors is 4, and the resistance values ​​are 100 ohms, 75 ohms, 35 ohms and 0 ohms respectively.

[0012] Preferably, starting with the light emitting diode of the first display unit connected to the sodium ion battery cell, according to the arrangement order of the display units, the light emitting color of the light emitting diode of the first display unit is red, the light emitting color of the light emitting diode of the last display unit is green, and the light emitting color of the light emitting diodes of the remaining display units is yellow.

[0013] On the other hand, the utility model provides a sodium ion battery module, the sodium ion battery module comprising a sodium ion battery and a display circuit, the display circuit comprising:

[0014] At least two display units, one end of one of the display units is used to be connected to the positive electrode of the sodium ion battery cell, and the other end is used to be connected to the negative electrode of the sodium ion battery cell, and one end of the remaining at least one display unit is connected to one end of the previous display unit, and the other end is connected to the other end of the previous display unit, wherein the starting voltage of each of the display units is different;

[0015] A diode, wherein the anode of the diode is connected to one end of the previous display unit, and the cathode of the diode is connected to the next display unit.

[0016] Preferably, the display unit comprises:

[0017] A light emitting diode, wherein the positive electrode of the light emitting diode is connected to one end of the display unit;

[0018] A current limiting resistor, one end of which is connected to the cathode of the light emitting diode, and the other end of which is connected to the other end of the display unit.

[0019] Preferably, starting from the current limiting resistor of the first display unit connected to the sodium ion battery cell, the resistance values ​​of the current limiting resistors of the display units decrease step by step in accordance with the arrangement order of the display units.

[0020] Preferably, the number of the current limiting resistors is 4, which are 100 ohms, 75 ohms, 35 ohms and 0 ohms respectively.

[0021] Preferably, starting with the light emitting diode of the first display unit connected to the sodium ion battery cell, according to the arrangement order of the display units, the light emitting color of the light emitting diode of the first display unit is red, the light emitting color of the light emitting diode of the last display unit is green, and the light emitting color of the light emitting diodes of the remaining display units is yellow.

[0022] Through the above technical scheme, the display circuit realizes the display function of the SOC state by setting a plurality of display units electrically connected to the diodes according to the characteristic that the charge and discharge curve of the sodium ion battery cell changes nearly linearly, controlling the starting voltages of different display units to be different, and sequentially lighting up the light-emitting diodes under different starting voltages; and light-emitting diodes of different colors can be set to clearly display the SOC state of the sodium ion battery cell; and the display circuit has a simple structure, is easy to use, and is low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a connection diagram of a simple SOC state display circuit for a sodium ion battery cell according to one embodiment of the utility model.

[0024] Description of Reference Numerals

[0025] 1. Display unit 2. Diode

[0026] 3. Light-emitting diode 4. Current-limiting resistor

[0027] 5. Sodium ion battery DETAILED DESCRIPTION

[0028] The specific implementation of the embodiment of the utility model is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the utility model, and is not used to limit the embodiment of the utility model.

[0029] like Figure 1 The figure shows a connection diagram of a simple SOC state display circuit of a sodium ion battery cell according to an embodiment of the present utility model; Figure 1 In the present invention, the simple SOC display circuit of the sodium ion battery cell may include at least two display units 1 and a diode 2; specifically, one end of one of the display units 1 is used to be connected to the positive electrode of the sodium ion battery cell 5, and the other end is used to be connected to the negative electrode of the sodium ion battery cell 5, and one end of the remaining at least one display unit 1 is connected to one end of the previous display unit 1, and the other end is connected to the other end of the previous display unit 1, wherein the starting voltage of each display unit 1 is different, and the positive electrode of the diode 2 is connected to one end of the previous display unit, and the negative electrode is connected to the next display unit.

[0030] Through the above technical solution, the display circuit, based on the characteristic that the charge and discharge curve of the sodium ion battery cell changes nearly linearly, sets multiple display units to be electrically connected with the diode, controls the starting voltages of different display units to be different, and sequentially lights up the light-emitting diodes at different starting voltages, thereby realizing the display function of the SOC status.

[0031] exist Figure 1 In consideration of the display of the SOC state of the sodium ion battery cell 5 and the protection of the circuit, in one embodiment of the utility model, the display unit 1 may include a light emitting diode 3 and a current limiting resistor 4, the positive electrode of the light emitting diode 3 may be connected to one end of the display unit 1, one end of the current limiting resistor 4 may be connected to the negative electrode of the light emitting diode 3, and the other end of the current limiting resistor 4 is connected to the other end of the display unit 1.

[0032] exist Figure 1 In order to meet the setting of the starting voltage of different display units 1, it is necessary to reasonably set the resistance value of the current limiting resistor 4 of different display units 1. In one embodiment of the utility model, the size relationship of the current limiting resistor 4 of different display units 1 can be a variety known to those skilled in the art. Starting from the current limiting resistor 4 of the first display unit 1 connected to the sodium ion battery cell 5, the resistance value of the current limiting resistor 4 of the display unit 1 decreases step by step according to the arrangement order of the display units 1.

[0033] exist Figure 1 In the embodiment of the present invention, the voltage range of the conventional sodium ion battery cell 5 is taken into consideration, and the size of the current limiting resistor 4 can be reasonably determined; in one embodiment of the present invention, the voltage of the conventional sodium ion battery cell 5 is 3.8V, and the voltage of the normal charge and discharge curve of the sodium ion battery cell 5 changes linearly, and stage points can be taken at 2.26V, 2.76V, 3.24V and 3.8V. There is an SOC interval between every two adjacent voltage values, and the current SOC can be displayed intuitively and accurately according to the current voltage. Therefore, according to the point setting of the normal charge and discharge curve, the number of the current limiting resistors 4 can be set to 4, and the resistance value of the current limiting resistor 4 can be a plurality of groups of values ​​known to those skilled in the art, which can be 100 ohms, 75 ohms, 35 ohms and 0 ohms respectively.

[0034] In order to more intuitively display the current voltage of the sodium ion battery cell 5 to display the current SOC state, the light emitting colors of the light emitting diodes 3 of different display units 1 are set. In one embodiment of the utility model, starting with the light emitting diode 3 of the first display unit 1 connected to the sodium ion battery cell 5, according to the arrangement order of the display units 1, the light emitting color of the light emitting diode 3 of the first display unit 1 is red, the light emitting color of the light emitting diode 3 of the last display unit 1 is green, and the light emitting color of the light emitting diodes 3 of the remaining display units 1 is yellow; when the voltage of the sodium ion battery cell 5 is low, only the light emitting diode 3 of the first display unit 1 will be lit, and the light emitting color of the light emitting diode 3 is red. When the voltage of the sodium ion battery cell 5 is full, the last light emitting diode 3 will be lit, and the light emitting color of the light emitting diode 3 is green. When one of the remaining light emitting diodes 3 emits light and the color is yellow, it indicates that the voltage state of the sodium ion battery cell 5 is good.

[0035] On the other hand, the utility model provides a sodium ion battery module, which includes a sodium ion battery 5 and a display circuit, wherein the display circuit includes at least two display units 1 and a diode 2; specifically, one end of one of the display units 1 is used to be connected to the positive electrode of the sodium ion battery 5, and the other end is used to be connected to the negative electrode of the sodium ion battery 5, and one end of the remaining at least one display unit 1 is connected to one end of the previous display unit 1, and the other end is connected to the other end of the previous display unit 1, wherein the starting voltage of each display unit 1 is different, and the positive electrode of the diode 2 is connected to one end of the previous display unit 1, and the negative electrode is connected to the next display unit 1.

[0036] Through the above technical solution, the SOC state of the sodium ion battery cell in the sodium ion battery cell module can be monitored in real time by setting multiple display units connected to diodes. Different display units have different starting voltages. When the voltage of the sodium ion battery cell reaches the starting voltage of the corresponding display unit, the corresponding light-emitting diode can be lit to complete the SOC state monitoring. In addition, the display circuit structure is simple, easy to use and low cost.

[0037] exist Figure 1 In consideration of the display of the SOC state of the sodium ion battery cell 5 and the protection of the circuit, in one embodiment of the utility model, the display unit 1 may include a light emitting diode 3 and a current limiting resistor 4, the positive electrode of the light emitting diode 3 may be connected to one end of the display unit 1, one end of the current limiting resistor 4 may be connected to the negative electrode of the light emitting diode 3, and the other end of the current limiting resistor 4 is connected to the other end of the display unit 1.

[0038] exist Figure 1In order to meet the setting of the starting voltage of different display units 1, it is necessary to reasonably set the resistance value of the current limiting resistor 4 of different display units 1. In one embodiment of the utility model, the size relationship of the current limiting resistor 4 of different display units 1 can be a variety known to those skilled in the art. Starting from the current limiting resistor 4 of the first display unit 1 connected to the sodium ion battery cell 5, the resistance value of the current limiting resistor 4 of the display unit 1 decreases step by step according to the arrangement order of the display units 1.

[0039] exist Figure 1 In the embodiment of the present invention, the voltage range of the conventional sodium ion battery cell 5 is taken into consideration, and the size of the current limiting resistor 4 can be reasonably determined; in one embodiment of the present invention, the voltage of the conventional sodium ion battery cell 5 is 3.8V, and the voltage of the normal charge and discharge curve of the sodium ion battery cell 5 changes linearly, and stage points can be taken at 2.26V, 2.76V, 3.24V and 3.8V. There is an SOC interval between every two adjacent voltage values, and the current SOC can be displayed intuitively and accurately according to the current voltage. Therefore, according to the point setting of the normal charge and discharge curve, the number of the current limiting resistors 4 can be set to 4, and the resistance value of the current limiting resistor 4 can be a plurality of groups of values ​​known to those skilled in the art, which can be 100 ohms, 75 ohms, 35 ohms and 0 ohms respectively.

[0040] In order to more intuitively display the current voltage of the sodium ion battery cell 5 to display the current SOC state, the light emitting colors of the light emitting diodes 3 of different display units 1 are set. In one embodiment of the utility model, starting with the light emitting diode 3 of the first display unit 1 connected to the sodium ion battery cell 5, according to the arrangement order of the display units 1, the light emitting color of the light emitting diode 3 of the first display unit 1 is red, the light emitting color of the light emitting diode 3 of the last display unit 1 is green, and the light emitting color of the light emitting diodes 3 of the remaining display units 1 is yellow; when the voltage of the sodium ion battery cell 5 is low, only the light emitting diode 3 of the first display unit 1 will be lit, and the light emitting color of the light emitting diode 3 is red. When the voltage of the sodium ion battery cell 5 is full, the last light emitting diode 3 will be lit, and the light emitting color of the light emitting diode 3 is green. When one of the remaining light emitting diodes 3 emits light and the color is yellow, it indicates that the voltage state of the sodium ion battery cell 5 is good.

[0041] Through the above technical scheme, the display circuit and the battery module are based on the characteristic that the charging and discharging curve of the sodium ion battery cell changes nearly linearly, by setting multiple display units to be electrically connected with the diode, controlling the starting voltages of different display units to be different, and sequentially lighting up the light-emitting diodes under different starting voltages, thereby realizing the display function of the SOC state; and light-emitting diodes of different colors can be set to clearly and explicitly display the SOC state of the sodium ion battery cell; and the display circuit structure is simple, easy to use, and low cost.

[0042] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0043] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A simple SOC status display circuit for a sodium ion battery cell, characterized in that: The display circuit comprises: At least two display units, one end of one of the display units is used to connect to the positive electrode of the sodium ion battery cell, and the other end is used to connect to the negative electrode of the sodium ion battery cell, and one end of the remaining at least one display unit is connected to one end of the previous display unit, and the other end is connected to the other end of the previous display unit, wherein the starting voltage of each of the display units is different; A diode, wherein the anode of the diode is connected to one end of the previous display unit, and the cathode of the diode is connected to the next display unit.

2. The display circuit according to claim 1, characterized in that: The display unit comprises: A light emitting diode, wherein the positive electrode of the light emitting diode is connected to one end of the display unit; A current limiting resistor, one end of which is connected to the cathode of the light emitting diode, and the other end of which is connected to the other end of the display unit.

3. The display circuit according to claim 2, characterized in that: Starting from the current limiting resistor of the first display unit connected to the sodium ion battery cell, the resistance values ​​of the current limiting resistors of the display units decrease step by step in accordance with the arrangement sequence of the display units.

4. The display circuit according to claim 3, characterized in that: There are four current-limiting resistors, and their resistance values ​​are 100 ohms, 75 ohms, 35 ohms and 0 ohms respectively.

5. The display circuit according to claim 2, characterized in that: Starting from the light emitting diode of the first display unit connected to the sodium ion battery cell, according to the arrangement order of the display units, the light emitting color of the light emitting diode of the first display unit is red, the light emitting color of the light emitting diode of the last display unit is green, and the light emitting color of the light emitting diodes of the remaining display units is yellow.

6. A sodium ion battery cell module, characterized in that: The sodium ion battery module includes a sodium ion battery and a display circuit, and the display circuit includes: At least two display units, one end of one of the display units is used to be connected to the positive electrode of the sodium ion battery cell, and the other end is used to be connected to the negative electrode of the sodium ion battery cell, and one end of the remaining at least one display unit is connected to one end of the previous display unit, and the other end is connected to the other end of the previous display unit, wherein the starting voltage of each of the display units is different; A diode, wherein the anode of the diode is connected to one end of the previous display unit, and the cathode of the diode is connected to the next display unit.

7. The sodium ion battery cell module according to claim 6, characterized in that: The display unit comprises: A light emitting diode, wherein the positive electrode of the light emitting diode is connected to one end of the display unit; A current limiting resistor, one end of which is connected to the cathode of the light emitting diode, and the other end of which is connected to the other end of the display unit.

8. The sodium ion battery cell module according to claim 7, characterized in that: Starting from the current limiting resistor of the first display unit connected to the sodium ion battery cell, the resistance values ​​of the current limiting resistors of the display units decrease step by step in accordance with the arrangement sequence of the display units.

9. The sodium ion battery cell module according to claim 8, characterized in that: The number of the current limiting resistors is 4, which are 100 ohms, 75 ohms, 35 ohms and 0 ohms respectively.

10. The sodium ion battery cell module according to claim 7, characterized in that: Starting from the light emitting diode of the first display unit connected to the sodium ion battery cell, according to the arrangement order of the display units, the light emitting color of the light emitting diode of the first display unit is red, the light emitting color of the light emitting diode of the last display unit is green, and the light emitting color of the light emitting diodes of the remaining display units is yellow.