KR20220157723A - Battery Over-temperature Protection Apparatus - Google Patents

Abstract

The present invention relates to a battery over-temperature protection apparatus, which comprises: a first temperature detection sensor (21) which detects a first temperature (T1) from a lithium-ion battery (20); a second temperature detection sensor (22) which detects a second temperature (T2) from the lithium-ion battery (20); a first resistor (31) which is connected in series with the first temperature detection sensor (21) and to which a voltage is applied when reaching the first temperature (T1); a second resistor (32) which is connected in series with the second temperature detection sensor (22) and to which a voltage is applied, when reaching the second temperature (T2); a charger (12) for charging the lithium-ion battery (20); and a control unit (14) for controlling the charger (12). When the lithium-ion battery (20) reaches the first temperature (T1), the control unit (14) controls the output power of the charger (12) to decrease to a first output power (P_T1). The control unit (14) controls the output power of the charger (12) to decrease to a second output power (P_T2) when the lithium-ion battery (20) reaches the second temperature (T2). Therefore, the present invention can effectively protect the battery from over-temperature.

Description

Battery over-temperature protection device {Battery Over-temperature Protection Apparatus}

The present invention proposes a battery overtemperature protection device that performs overtemperature protection of a battery based on a temperature detection sensor that respectively detects a first temperature, a second temperature, a third temperature, and the like. Above all, the first temperature, the second temperature, and the third temperature, which are different from each other, are detected through independent sensors rather than a single sensor, and the number of sensor wires of the battery is very effectively reduced. It relates to a battery overtemperature protection device that effectively controls according to temperature.

Recently, efficient use of electric energy is essential to reduce global warming and fine dust, and the need for energy storage systems (ESS) is rapidly increasing in all fields, especially lithium-ion batteries and battery charging as secondary batteries for charging and discharging. The use of chargers for However, due to its instability, the lithium-ion battery always starts to deteriorate in performance due to overcharge, overdischarge, overcurrent, overload, etc., and when the performance falls below a certain level, the lithium-ion battery due to overtemperature There is a problem that the risk of fire and explosion always follows, and various studies are being actively conducted to prevent over-temperature of the battery.

As related prior literature, Korean Patent Registration No. 10-0739463, published on July 13, 2007 (hereinafter referred to as [Patent Document 1]), detects when the temperature of a lithium-ion battery rises and blocks charging or discharging. A battery protection circuit consisting of a protection IC, a first FET, a second FET, and a parasitic diode to prevent overcurrent or overcharge is disclosed.

In addition, Korean Patent Registration No. 10-1210088, published on December 17, 2012 (hereinafter referred to as [Patent Document 2]), relates to a protection circuit module having a thermistor and a battery pack including the same, a printed circuit board, A flexible film, a thermistor mounted on the flexible film to sense the temperature of a bare cell and transmit the temperature to the printed circuit board, and a protective circuit module in which a portion of the thermistor is exposed in the flexible film have been disclosed.

In addition, Korean Patent Registration No. 10-2046003, published on November 18, 2019 (hereinafter referred to as [Patent Document 3]), relates to a battery cell protection system and method using a PTC device, battery cell temperature measurement step , battery cell temperature comparison and determination step, first and second current PTC element driving step, when the PTC element receives the first and second current values, the supply of current from an external charger to the battery cell is blocked. A protection system and method were disclosed.

The above [Patent Document 1] to [Patent Document 3] are devices for over-temperature protection of the battery, but there is a limit to controlling the battery charging power accordingly by changing the temperature of the battery.

Patent Document 1: Republic of Korea Patent Registration No. 10-0739463, Publication Date 2007. 07. 13. Patent Document 2: Republic of Korea Patent Registration No. 10-1210088, Publication Date 2012. 12. 17. Patent Document 3: Republic of Korea Patent Registration No. 10-2046003, Publication Date 2019. 11. 18.

In general, a temperature detection sensor of a lithium-ion battery is characterized by detecting the temperature of a specific part of the battery. That is, when temperature detection is required in two different places inside the lithium-ion battery, a total of four temperature detection sensor wires are required, and when temperature detection is required at three different places inside the lithium-ion battery, a total of six wires are required. Temperature detection sensor wiring is required. That is, when temperature detection is required in n places in a battery, a total of n × 2 strands of temperature detection sensor wires are generally required. In addition, it is common to detect only a specific temperature state in general. However, first, in the present invention, the first temperature (eg 65 degrees), the second temperature (eg 70 degrees), the third temperature (eg 80 degrees), the fourth temperature (eg 85 degrees) and the fifth temperature (eg 90 degrees) ) and the like, and secondly, detecting different temperatures such as the first temperature detection sensor 21, the second temperature detection sensor 22, and the third temperature detection sensor 23 Third, the sensor wiring for detecting the temperature is minimized.

(Example 1) Even when the first temperature is detected at n points in the battery, only two wires are required.

(Example 2) Even if the first temperature is detected at n places in the battery and the second temperature is detected at m places in the battery at the same time, only three wires are required.

(Example 3) 1st temperature, 2nd temperature, 3rd temperature are detected, and for each temperature, only 4 wires are required even when multiple temperatures are detected in the battery.

Fourth, it is a task to be solved through the present invention to control the battery charging power differently according to each temperature.

A battery overtemperature protection device according to a first aspect of the present invention for solving the above problems includes a first temperature detection sensor 21 for detecting a first temperature T1 in a lithium ion battery 20; a second temperature detection sensor 22 for detecting a second temperature T2 in the lithium ion battery 20; a third temperature detection sensor 23 for detecting a third temperature T3 in the lithium ion battery 20; a first resistor 31 connected in series with the first temperature detection sensor 21 and to which a voltage is applied when the first temperature T1 is reached; a second resistor 32 connected in series with the second temperature detection sensor 22 and to which a voltage is applied when the second temperature T2 is reached; a third resistor 33 connected in series with the third temperature detection sensor 23 and to which a voltage is applied when the third temperature T3 is reached; a charger 12 for charging the lithium ion battery 20; and a controller 14 for controlling the charger 12; When the lithium ion battery 20 reaches the first temperature T1, the control unit 14 controls the output power of the charger 12 to be reduced to the first output power P _T1 . and; When the lithium ion battery 20 reaches the second temperature T2, the control unit 14 controls the output power of the charger 12 to decrease to the second output power P _T2 ; When the lithium ion battery 20 reaches the third temperature T3, the control unit 14 controls the output power of the charger 12 to be reduced to the third output power P _T3 . do.

A battery overtemperature protection device according to a second aspect of the present invention for solving the above problems includes a first temperature detection sensor 21 for detecting a first temperature T1 in a lithium ion battery 20; a second temperature detection sensor 22 for detecting a second temperature T2 in the lithium ion battery 20; a first resistor 31 connected in series with the first temperature detection sensor 21 and to which a voltage is applied when the first temperature T1 is reached; a second resistor 32 connected in series with the second temperature detection sensor 22 and to which a voltage is applied when the second temperature T2 is reached; a charger 12 for charging the lithium ion battery 20; and a controller 14 for controlling the charger 12; When the lithium ion battery 20 reaches the first temperature T1, the control unit 14 controls the output power of the charger 12 to be reduced to the first output power P _T1 . and; The controller 14 controls the output power of the charger 12 to be reduced to the second output power P _T2 when the lithium ion battery 20 reaches the second temperature T2. do.

A battery overtemperature protection device according to a third aspect of the present invention for solving the above problems includes a 1-1 temperature detection sensor ( 21-1); a first-second temperature detection sensor 21-2 for detecting a first temperature T1 at a second position of the lithium ion battery 20; a second temperature detection sensor 22 that detects a second temperature T2 at a third position of the lithium ion battery 20; It is connected in series with the 1-1 temperature detection sensor 21-1 and the 1-2 temperature detection sensor 21-2, and the 1-1 temperature detection sensor 21-1 or the 1-2 a first resistor 31 to which a voltage is applied when the temperature detection sensor 21-2 reaches the first temperature T1; and a second resistor 32 connected in series with the second temperature detection sensor 22 and to which a voltage is applied when the second temperature T2 is reached. It is characterized in that it includes.

Preferably, when the first, second, and third temperature detection sensors 21, 22, and 23 reach a specific temperature, the first, second, and third temperature detection sensors 21, 22, and 23 It is characterized in that the internal resistance value instantaneously changes from an insulator to a metal.

Also preferably, the first temperature T1, the second temperature T2, and the third temperature T3 are different from each other.

More preferably, the first temperature T1 is 65 degrees; the second temperature T2 is 70 degrees; characterized in that the third temperature (T3) is 75 degrees, or the first temperature (T1) is 65 degrees; the second temperature T2 is 75 degrees; The third temperature (T3) is characterized in that 85 degrees.

Also preferably, a third temperature detection sensor 23 for detecting a third temperature T3 at a fourth position of the lithium ion battery 20; It is characterized in that it further comprises.

Also preferably, the lithium ion battery 20 is charged with the information of the first temperature T1 by detecting a plurality of temperatures at different positions inside the lithium ion battery 20 for the first temperature T1. The wiring to be delivered to the controller 14 of the charger 12 is characterized in that only two wires are required.

Also preferably, the first temperature T1 is detected as a plurality of temperatures at different locations inside the lithium ion battery 20; detecting a plurality of temperatures at different positions in the lithium ion battery 20 as the second temperature T2; It is characterized in that only three wires are required for transferring the first and second temperatures T1 and T2 to the controller 14 of the charger 12 for charging the lithium ion battery 20 .

Also preferably, the first temperature T1 is detected as a plurality of temperatures at different locations inside the lithium ion battery 20; detecting a plurality of temperatures at different positions in the lithium ion battery 20 as the second temperature T2; detecting a plurality of temperatures at different positions in the lithium ion battery 20 as the third temperature T4; The wiring that transfers the first, second, and third temperatures (T1, T2, T3) to the controller 14 of the charger 12 for charging the lithium ion battery 20 is characterized in that only four wires are required. do.

A battery overtemperature protection device according to a fourth aspect of the present invention for solving the above problems includes a 1-1 temperature detection sensor (which detects a first temperature T1 at a first position of a lithium ion battery 20) 21-1); a first-second temperature detection sensor 21-2 for detecting a first temperature T1 at a second position of the lithium ion battery 20; 1-3 temperature detection sensors 21-3 for detecting a first temperature T1 at a third position of the lithium ion battery 20; a second temperature detection sensor 22 for detecting a second temperature T2 at a fourth position of the lithium ion battery 20; It is connected in series with the 1-1 temperature detection sensor 21-1, the 1-2 temperature detection sensor 21-2 and the 1-3 temperature detection sensor 21-3, and the 1-1 , when a specific temperature sensor among the 1-2 and 1-3 temperature detection sensors 21-1, 21-2, and 21-3 reaches the first temperature T1, a voltage is applied. 1 resistor (31); a second resistor 32 connected in series with the second temperature detection sensor 22 and to which a voltage is applied when the second temperature T2 is reached; a charger 12 for charging the lithium ion battery 20; and a controller 14 for controlling the charger 12; When the lithium ion battery 20 reaches the first temperature T1, the control unit 14 controls the output power of the charger 12 to be reduced to the first output power P _T1 . and; The controller 14 controls the output power of the charger 12 to be reduced to the second output power P _T2 when the lithium ion battery 20 reaches the second temperature T2. do.

Also preferably, the first, second, and third temperature sensors 21, 22, and 23 detect the temperature of the lithium ion battery 20 through a super thermal conductor.

More preferably, the super heat conductor is a closed super heat conductor 41 or an open super heat conductor 42 .

Also preferably, the first, second, and third temperature detection sensors 21, 22, and 23 are connected to the super heat conductor by a thermal paste 28 so that the temperature detected by the super heat conductor is the first, second, and third temperature sensors. 2 and 3 characterized in that it is transmitted to the temperature detection sensors (21, 22, 23).

First, the battery overtemperature protection device proposed in the present invention is capable of detecting different temperatures, such as a first temperature, a second temperature, and a third temperature, at different positions, such as a first position, a second position, and a third position, respectively. It is a battery over-temperature protection device. Second, it is very inexpensive compared to the existing thermocouple thermocoupler. Third, it requires the least amount of wiring to transmit the temperature detected by the lithium-ion battery to the controller of the charger. Fourth, the temperature of the battery is increased in the present invention that the overtemperature of the battery can be effectively protected by differentially controlling the charging power of the battery according to the first temperature, the second temperature, the third temperature, etc. to effect

Meanwhile, additional features and advantages of the present invention will become more clear through the following description.

1 is a metal-insulator instantaneous transition phenomenon.
2 is a thermocouple thermocoupler, a negative temperature coefficient (NTC) thermistor, and a metal-insulator instantaneous transition sensor.
3 is a characteristic curve of a negative temperature coefficient (NTC) thermistor.
4 is a characteristic curve of a metal-insulator instantaneous transition sensor.
5 is a characteristic curve of a metal-insulator instantaneous transition sensor based on a change in temperature at which a metal-insulator instantaneous transition phenomenon begins to occur.
6 is a first embodiment of a battery overtemperature protection device and a charger using the same proposed in the present invention.
7 is a second embodiment of a battery overtemperature protection device and a charger using the same proposed in the present invention.
8 is a third embodiment of a battery overtemperature protection device and a charger using the same proposed in the present invention.
9a and 9b are a fourth embodiment of a battery overtemperature protection device and a charger using the same proposed in the present invention.
10A and 10B are a fifth embodiment of a battery overtemperature protection device and a charger using the device proposed in the present invention.
11 is a charger power control according to the proposed first, second, and third temperature detection sensors.
12 is a photograph of a lithium ion battery and a proposed metal-insulator instantaneous transition sensor arrangement.

The present invention will be described with reference to the accompanying drawings for preferred embodiments.

However, the embodiments of the present invention can be modified in various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below, and those of ordinary skill in the art can It is provided for complete explanation.

1 shows a metal-insulator-transition phenomenon. The characteristics of the metal-insulator instantaneous transition sensor used as the temperature sensor of the present invention are shown. Figure 1 (a) shows a Mott insulator with uniform Coulomb energy (U), and Figure 1 (b) means a phenomenon in which the resistance value is rapidly changed from an insulator to a metal at the moment one electron escapes. .

2 shows a thermocouple thermocoupler, a negative temperature coefficient (NTC) thermistor, and a metal-insulator instantaneous transition sensor. FIG. 2(a) shows a thermocouple thermocoupler, FIG. 2(b) shows a Negative Temperature Coefficient (NTC) thermistor, and FIG. 2(c) shows a metal-insulator-transition ) indicates the sensor. The thermocouple thermocoupler of FIG. 2 (a) has excellent temperature detection accuracy, but has the disadvantage of being very expensive. In the case of the NTC thermistor in FIG. There is a disadvantage that the change in resistance value is gradual at a temperature of 70 degrees or more. However, the metal-insulator instantaneous transition sensor of FIG. 2 (c) used in the present invention is very inexpensive, and the change in resistance value changes very rapidly due to the metal-insulator instantaneous transition phenomenon at a temperature of 70 degrees. as a technical feature.

3 shows the resistance value change characteristic according to the temperature of the conventional NTP thermistor. As an existing low-cost temperature sensor, the most commonly used element is the NTP thermistor. However, in the case of the existing NTC thermistors, there is a problem that the change in resistance value changes slowly rather than abruptly at around 70 degrees, which is the temperature at which a fire starts. There is a problem in that it is difficult to accurately detect the temperature.

4 shows a characteristic curve of a metal-insulator instantaneous transition sensor. In the case of the metal-insulator instantaneous transition sensor, the resistance value rapidly decreases at a temperature of about 70 degrees (67 degrees to be exact). When actually measured, the package of the metal-insulator instantaneous transition sensor requires time for heat transfer, so it operates at 70 degrees, and the resistance value changes rapidly from 372.1 [kΩ] at 70 degrees to 44.49 [Ω] at 75 degrees. I was able to confirm what was going on. Therefore, the metal-insulator instantaneous transition sensor used in the present invention is very inexpensive and has the advantage of rapidly changing resistance at a temperature of 70 degrees, which is the temperature before a fire starts.

5 shows a characteristic curve of a metal-insulator instantaneous transition sensor based on a change in temperature at which a metal-insulator instantaneous transition phenomenon starts to occur. Fig. 5(a) is 65 degrees / Fig. 5(b) is 70 degrees / Fig. 5(c) is 75 degrees / Fig. 5(d) is 80 degrees / Fig. 5(d) is 90 degrees The occurrence of a transition phenomenon is a technical feature. The greatest feature of the present invention is that a battery overtemperature protection device is implemented based on the fact that each metal-insulator instantaneous transition sensor has a characteristic of differentially detecting temperature. This is characterized by varying the oxygen (O ₂ ) concentration in the manufacturing process of the metal-insulator instantaneous transition sensor and manufacturing the temperature differently by varying the lattice structure of the sensor.

6 shows a battery overtemperature protection device and a charger using the same according to the first embodiment of the present invention. The battery overtemperature protection device includes a first temperature detection sensor 21 for detecting a first temperature T1 and a second temperature detection sensor 22 for detecting a second temperature T2 in a lithium ion battery 20. holds Above all, it is connected in series with the first temperature detection sensor 21, and when the first temperature T1 is reached, the first resistor 31 to which voltage is applied, and the second temperature detection sensor 22 in series. , and when the second temperature T2 is reached, a second resistor 32 to which a voltage is applied is disposed.

The charger 12 for charging the lithium ion battery 20 operates by receiving AC power 11, and a control unit 14 for controlling the charger 12 is located.

When the lithium ion battery 20 reaches the first temperature T1, the control unit 14 controls the output power of the charger 12 to be reduced to a first output power P _T1 , and the control unit (14) is characterized in that when the lithium ion battery 20 reaches the second temperature T2, the output power of the charger 12 is controlled to decrease to the second output power P _T2 . .

7 shows a battery overtemperature protection device and a charger using the same according to a second embodiment of the present invention. The battery overtemperature protection device includes a first temperature detection sensor 21 for detecting a first temperature T1 and a second temperature detection sensor 22 for detecting a second temperature T2 in a lithium ion battery 20. and a third temperature detection sensor 23 for detecting a third temperature T3. Above all, it is connected in series with the first temperature detection sensor 21, and when the first temperature T1 is reached, the first resistor 31 to which voltage is applied, and the second temperature detection sensor 22 in series. When the second temperature T2 is reached, the second resistor 32 to which voltage is applied is connected in series with the third temperature detection sensor 23, and the third temperature T3 is reached. Then, a third resistor 33 to which voltage is applied is disposed.

The charger 12 for charging the lithium ion battery 20 operates by receiving AC power 11, and a control unit 14 for controlling the charger 12 is located.

When the lithium ion battery 20 reaches the first temperature T1, the control unit 14 controls the output power of the charger 12 to be reduced to a first output power P _T1 , and the control unit (14) controls the output power of the charger 12 to be reduced to the second output power P _T2 when the lithium ion battery 20 reaches the second temperature T2, and the control unit 14 ) is a technical feature of controlling the output power of the charger 12 to be reduced to the third output power P _T3 when the lithium ion battery 20 reaches the third temperature T3 .

8 shows a third embodiment of a battery overtemperature protection device and a charger using the battery overtemperature protection device proposed in the present invention. In a battery overtemperature protection device, a 1-1 temperature detection sensor (21-1) detecting a first temperature (T1) at a first position of a lithium ion battery (20), a first of the lithium ion battery (20) The 1-2 temperature detection sensor 21-2 detects the first temperature T1 at two positions, and the first-second temperature sensor 21-2 detects the first temperature T1 at the third position of the lithium ion battery 20. 3 temperature detection sensors 21-3 are disposed. All of the 1-1, 1-2, and 1-3 temperature sensors 21-1, 21-2, and 21-3 detect the first temperature T1. In addition, a second temperature detection sensor 22 for detecting a second temperature T2 is disposed at a fourth position of the lithium ion battery 20 .

It is connected in series with the 1-1 temperature detection sensor 21-1, the 1-2 temperature detection sensor 21-2 and the 1-3 temperature detection sensor 21-3, and the 1-1 , when a specific temperature sensor among the 1-2 and 1-3 temperature detection sensors 21-1, 21-2, and 21-3 reaches the first temperature T1, a voltage is applied. 1 resistor 31 is disposed, connected in series with the second temperature detection sensor 22, and when the second temperature T2 is reached, a second resistor 32 to which voltage is applied is disposed.

When the lithium ion battery 20 reaches the first temperature T1, the charger 12 for charging the lithium ion battery 20 and the controller 14 for controlling the charger 12 Controls the output power of the charger 12 to be reduced to a first output power P _T1 , and the control unit 14, when the lithium ion battery 20 reaches the second temperature T2, the charger ( 12) is a technical feature of controlling the output power to be reduced to the second output power (P _T2 ).

The first temperature T1 is detected as a plurality of temperatures at different positions inside the lithium ion battery 20, and the second temperature T2 is set at a specific position inside the lithium ion battery 20. There are only three wires for detecting a plurality of temperatures and transferring the first and second temperatures T1 and T2 to the control unit 14 of the charger 12 for charging the lithium ion battery 20. Since it is necessary, it is characterized in that the number of wires is the smallest in detecting the temperature of the lithium ion battery 20 .

9A and 9B show a battery overtemperature protection device proposed in the present invention and a charger using the same in a fourth embodiment, and FIGS. 10A and 10B show a battery overtemperature protection device and a charger using the same in a fifth embodiment proposed in the present invention. indicate an example.

The battery overtemperature protection device in FIGS. 9A and 9B and FIGS. 10A and 10B includes a first temperature detection sensor 21 for detecting a first temperature T1 in the lithium ion battery 20 and a second temperature ( It has a second temperature detection sensor 22 that detects T2). Above all, it is connected in series with the first temperature detection sensor 21, and when the first temperature T1 is reached, the first resistor 31 to which voltage is applied, and the second temperature detection sensor 22 in series. , and when the second temperature T2 is reached, a second resistor 32 to which a voltage is applied is disposed.

The charger 12 for charging the lithium ion battery 20 operates by receiving AC power 11, and a control unit 14 for controlling the charger 12 is located.

When the lithium ion battery 20 reaches the first temperature T1, the control unit 14 controls the output power of the charger 12 to be reduced to a first output power P _T1 , and the control unit (14) controls to reduce the output power of the charger 12 to the second output power P _T2 when the lithium ion battery 20 reaches the second temperature T2.

Above all, it is characterized by detecting the temperature of the lithium ion battery 20 through a super thermal conductor in order to detect heat in every corner of the lithium ion battery 20, and in FIG. The shape of the super heat conductor 41 is used, and FIG. 9B is characterized in that the super heat conductor 41 of the zigzag closed shape is used.

In FIG. 10A, a super heat conductor 42 having a 'U' shape open shape is used, and in FIG. 10B, a super heat conductor 42 having a zigzag open shape is used.

The first, second, and third temperature detection sensors 21, 22, and 23 are connected to the super heat conductor by a thermal paste 28 so that the temperature detected by the super heat conductor is the first, second, third temperature detection sensor. It is characterized in that it is transmitted to the sensors (21, 22, 23).

The first temperature (T1), the second temperature (T2) and the third temperature (T3) are different from each other, and as a specific embodiment, the first temperature (T1) is 65 degrees, the second temperature (T1) The temperature T2 may be set to 70 degrees and the third temperature T3 to 75 degrees. As another embodiment, the first temperature T1 is 65 degrees and the second temperature T2 is 75 degrees. , the third temperature (T3) can be set to 85 degrees, and those skilled in the art can set it differently to a desired temperature.

11 shows charger power control according to the proposed first, second, and third temperature detection sensors. Above all, there is a relationship between the first temperature (T1) < the second temperature (T2) < the third temperature (T3), and the controller 14 determines that the lithium ion battery 20 is at the first temperature (T1). ) or less, the output power is charged to the maximum output power (Pmax), and when the lithium ion battery 20 reaches the first temperature (T1), the output power of the charger 12 is changed to the first output power (P). _T1 ), and when the lithium ion battery 20 reaches the second temperature T2 , the controller 14 converts the output power of the charger 12 to the second output power P _T2 . When the lithium ion battery 20 reaches the third temperature T3, the control unit 14 reduces the output power of the charger 12 to the third output power P _T3 . It is a technical feature to control to do.

12 shows a photograph of the arrangement of a lithium ion battery and the proposed metal-insulator instantaneous transition sensor. Temperature detection sensors at the first, second, and third positions such as the first temperature T1, the second temperature T2, and the third temperature T3 at specific locations of the lithium ion battery 20 It is characterized in that it can be placed.

The above description is only illustrative of the technical idea of the present invention, and the present invention can be applied to a battery overtemperature protection circuit by various modifications by those skilled in the art, and is easily modified technically. It should be recognized that the scope of the technology also falls within the scope of this patent.

This result (patent) is the result of a regional innovation project based on local government-university cooperation carried out with support from the National Research Foundation of Korea with financial resources from the Ministry of Education in 2021.

10: Battery over temperature protector
11: AC power
12 : charger
13: charger control signal
14: control unit
20: lithium ion battery
21: first temperature detection sensor
21-1: 1-1 temperature detection sensor
21-2: 1-2 temperature detection sensor
21-3: 1-3 temperature detection sensor
21-4: 1-4 temperature detection sensor
22: second temperature detection sensor
23: third temperature detection sensor
28: Thermal Paste
31: first resistor
32: second resistance
33: third resistor
41: super heat conductor with closed shape
42: super heat conductor with open shape
P _T1 : 1st output power
P _T2 : 2nd output power
P _T3 : 3rd output power
T1: first temperature
T2: second temperature
T3: third temperature
Vcc: temperature sensor control power

Claims (16)

In the battery overtemperature protection device,
a first temperature detection sensor 21 for detecting a first temperature T1 in the lithium ion battery 20;
a second temperature detection sensor 22 for detecting a second temperature T2 in the lithium ion battery 20;
a third temperature detection sensor 23 for detecting a third temperature T3 in the lithium ion battery 20;
a first resistor 31 connected in series with the first temperature detection sensor 21 and to which a voltage is applied when the first temperature T1 is reached;
a second resistor 32 connected in series with the second temperature detection sensor 22 and to which a voltage is applied when the second temperature T2 is reached;
a third resistor 33 connected in series with the third temperature detection sensor 23 and to which a voltage is applied when the third temperature T3 is reached;
a charger 12 for charging the lithium ion battery 20; and
a controller 14 for controlling the charger 12;
Including,
The control unit 14 controls the output power of the charger 12 to be reduced to a first output power P _T1 when the lithium ion battery 20 reaches the first temperature T1;
When the lithium ion battery 20 reaches the second temperature T2, the control unit 14 controls the output power of the charger 12 to decrease to the second output power P _T2 ;
When the lithium ion battery 20 reaches the third temperature T3, the control unit 14 controls the output power of the charger 12 to be reduced to the third output power P _T3 . Battery over-temperature protection device.
In the battery overtemperature protection device,
a first temperature detection sensor 21 for detecting a first temperature T1 in the lithium ion battery 20;
a second temperature detection sensor 22 for detecting a second temperature T2 in the lithium ion battery 20;
a first resistor 31 connected in series with the first temperature detection sensor 21 and to which a voltage is applied when the first temperature T1 is reached;
a second resistor 32 connected in series with the second temperature detection sensor 22 and to which a voltage is applied when the second temperature T2 is reached;
a charger 12 for charging the lithium ion battery 20; and
a controller 14 for controlling the charger 12;
Including,
The control unit 14 controls the output power of the charger 12 to be reduced to a first output power P _T1 when the lithium ion battery 20 reaches the first temperature T1;
The controller 14 controls the output power of the charger 12 to be reduced to the second output power P _T2 when the lithium ion battery 20 reaches the second temperature T2. Battery over-temperature protection device.
In the battery overtemperature protection device,
a 1-1 temperature detection sensor 21-1 for detecting a first temperature T1 at a first position of the lithium ion battery 20;
a first-second temperature detection sensor 21-2 for detecting a first temperature T1 at a second position of the lithium ion battery 20;
a second temperature detection sensor 22 that detects a second temperature T2 at a third position of the lithium ion battery 20;
It is connected in series with the 1-1 temperature detection sensor 21-1 and the 1-2 temperature detection sensor 21-2, and the 1-1 temperature detection sensor 21-1 or the 1-2 a first resistor 31 to which a voltage is applied when the temperature detection sensor 21-2 reaches the first temperature T1; and
a second resistor 32 connected in series with the second temperature detection sensor 22 and to which a voltage is applied when the second temperature T2 is reached;
Battery over-temperature protection device comprising a.
According to claim 1,
When the first, second, and third temperature detection sensors 21, 22, and 23 reach a specific temperature, the internal resistance value of the first, second, and third temperature detection sensors 21, 22, and 23 is A battery overtemperature protection device characterized by an instantaneous change from an insulator to a metal.
According to claim 1,
The battery overtemperature protection device, characterized in that the first temperature (T1), the second temperature (T2) and the third temperature (T3) are different from each other.
The method of claim 5,
the first temperature T1 is 65 degrees;
the second temperature T2 is 70 degrees;
Battery overtemperature protection device, characterized in that the third temperature (T3) is 75 degrees.
The method of claim 5,
the first temperature T1 is 65 degrees;
the second temperature T2 is 75 degrees;
Battery overtemperature protection device, characterized in that the third temperature (T3) is 85 degrees.
The method of claim 3,
a third temperature detection sensor 23 for detecting a third temperature T3 at a fourth position of the lithium ion battery 20;
Battery over-temperature protection device further comprising a.
According to claim 1,
A charger 12 for charging the lithium ion battery 20 with the information of the first temperature T1 by detecting a plurality of temperatures at different positions inside the lithium ion battery 20 as the first temperature T1. ) The battery overtemperature protection device, characterized in that only two wires are required for the wiring to be transmitted to the control unit 14.
According to claim 1,
detecting the first temperature T1 as a plurality of temperatures at different locations inside the lithium ion battery 20;
detecting a plurality of temperatures at different positions in the lithium ion battery 20 as the second temperature T2;
Battery overtemperature, characterized in that only three wires are required for the wiring that transfers the first and second temperatures (T1, T2) to the controller 14 of the charger 12 for charging the lithium ion battery 20 protection device.
According to claim 1,
detecting the first temperature T1 as a plurality of temperatures at different locations inside the lithium ion battery 20;
detecting a plurality of temperatures at different positions in the lithium ion battery 20 as the second temperature T2;
detecting a plurality of temperatures at different positions within the lithium ion battery 20 as the third temperature T4;
The wiring that transfers the first, second, and third temperatures (T1, T2, T3) to the controller 14 of the charger 12 for charging the lithium ion battery 20 is characterized in that only four wires are required. Battery over-temperature protection device.
In the battery overtemperature protection device,
a 1-1 temperature detection sensor 21-1 for detecting a first temperature T1 at a first position of the lithium ion battery 20;
a first-second temperature detection sensor 21-2 for detecting a first temperature T1 at a second position of the lithium ion battery 20;
1-3 temperature detection sensors 21-3 for detecting a first temperature T1 at a third position of the lithium ion battery 20;
a second temperature detection sensor 22 for detecting a second temperature T2 at a fourth position of the lithium ion battery 20;
It is connected in series with the 1-1 temperature detection sensor 21-1, the 1-2 temperature detection sensor 21-2 and the 1-3 temperature detection sensor 21-3, and the 1-1 , when a specific temperature sensor among the 1-2 and 1-3 temperature detection sensors 21-1, 21-2, and 21-3 reaches the first temperature T1, a voltage is applied. 1 resistor (31);
a second resistor 32 connected in series with the second temperature detection sensor 22 and to which a voltage is applied when the second temperature T2 is reached;
a charger 12 for charging the lithium ion battery 20; and
a controller 14 for controlling the charger 12;
Including,
The control unit 14 controls the output power of the charger 12 to be reduced to a first output power P _T1 when the lithium ion battery 20 reaches the first temperature T1;
The controller 14 controls the output power of the charger 12 to be reduced to the second output power P _T2 when the lithium ion battery 20 reaches the second temperature T2. Battery over-temperature protection device.
According to claim 1,
The battery overtemperature protection device, characterized in that the first, second, and third temperature detection sensors (21, 22, 23) detect the temperature of the lithium ion battery (20) through a super thermal conductor.
The method of claim 13,
The super heat conductor is a battery over-temperature protection device, characterized in that the super heat conductor (41) of a closed shape.
The method of claim 13,
The super heat conductor is a battery over-temperature protection device, characterized in that the super heat conductor 42 of the open shape.
The method of claim 13,
The first, second, and third temperature detection sensors 21, 22, and 23 are connected to the super heat conductor by a thermal paste 28 so that the temperature detected by the super heat conductor is the first, second, third temperature detection sensor. Battery overtemperature protection device, characterized in that transmitted to the sensors (21, 22, 23).

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