CN-122000511-A - Battery system based on battery temperature sensor arrangement and battery power control method

Abstract

The invention relates to a battery system and a battery power control method based on a battery temperature sensor arrangement. The battery system has a plurality of cells and a cooling block disposed above the cells, and includes a first temperature sensor disposed adjacent to an explosion-proof valve of the cells for sensing the temperature of the cells, a second temperature sensor disposed at a lower portion of the cells for sensing the temperature of the cells, a third temperature sensor disposed at an upper portion of the cells for sensing the temperature of the cells, and a controller receiving the sensed temperatures of the first, second, and third temperature sensors and judging whether a thermal runaway fault, an overtemperature fault, or a low temperature fault occurs to the battery based on the sensed temperatures. By sensing the temperature of the battery cell, determining whether the battery is faulty and determining the type of fault, the battery power can be controlled, thereby improving battery life and battery safety.

Inventors

• LI ZHENGHUI
• SHI WENNA
• GUO LING
• FU HONGLI

Assignees

• 现代自动车株式会社
• 起亚株式会社

Dates

Publication Date

20260508

Application Date

20241106

Claims (20)

1. 1. A battery system based on a battery temperature sensor arrangement, the battery having a plurality of cells and a cooling block arranged above the cells, the battery system comprising: at least one first temperature sensor disposed adjacent to the explosion-proof valve of the at least one cell for sensing the temperature of the cell; at least one second temperature sensor disposed at a lower portion of the at least one battery cell for sensing a temperature of the battery cell; At least one third temperature sensor arranged on the upper part of the at least one battery cell for sensing the temperature of the battery cell, and And a controller that receives sensed temperatures of the first, second, and third temperature sensors and determines whether a thermal runaway failure, an overtemperature failure, or a low temperature failure of the battery occurs based on the sensed temperatures of the first, second, and third temperature sensors.
2. 2. The battery system based on a battery temperature sensor arrangement of claim 1, wherein the controller is configured to: comparing the sensed temperatures of the first, second and third temperature sensors and determining a maximum temperature and a minimum temperature; And judging whether the battery has thermal runaway fault, overtemperature fault or low temperature fault by using the determined highest temperature and lowest temperature.
3. 3. The battery system based on a battery temperature sensor arrangement of claim 2, wherein the controller is further configured to: under the condition that the battery is judged to have a thermal runaway fault or an overtemperature fault or a low temperature fault or other serious faults, or the charging voltage of the battery reaches a charging cut-off voltage or the discharging voltage of the battery reaches a discharging cut-off voltage, the charging power or the discharging power of the battery is set to be 0; In the case where it is judged that the thermal runaway failure does not occur and the over-temperature failure does not occur and the low-temperature failure does not occur and other serious failures do not occur and the charge voltage of the battery does not reach the charge cutoff voltage and the discharge voltage of the battery does not reach the discharge cutoff voltage, the maximum charge power or the maximum discharge power of the battery is determined and the power of the battery is made equal to or less than the maximum charge power or the maximum discharge power.
4. 4. The battery system based on a battery temperature sensor arrangement of claim 2, wherein the controller is further configured to: Determining whether the maximum temperature exceeds a first predetermined temperature and continues for a first predetermined time, In the event that the maximum temperature exceeds the first predetermined temperature for a first predetermined time, it is determined that a thermal runaway fault has occurred.
5. 5. The battery system based on a battery temperature sensor arrangement of claim 4, wherein the controller is further configured to: In case the maximum temperature does not exceed the first predetermined temperature, or does not last for a first predetermined time, Determining whether the highest temperature exceeds a second predetermined temperature for a second predetermined time, and whether one third or more of the total number of the first temperature sensor, the second temperature sensor, and the third temperature sensor is disconnected for the second predetermined time, In the case where the highest temperature exceeds the second predetermined temperature for a second predetermined time, and one third or more of the total number of the first temperature sensor, the second temperature sensor, and the third temperature sensor are disconnected for the second predetermined time, it is determined that a thermal runaway fault occurs, Wherein the second predetermined temperature is less than the first predetermined temperature.
6. 6. The battery system based on a battery temperature sensor arrangement of claim 5, wherein the controller is further configured to: In the case where the highest temperature does not exceed the second predetermined temperature or does not last for the second predetermined time, or one third or more of the total number of the first temperature sensor, the second temperature sensor and the third temperature sensor is not disconnected or does not last for the second predetermined time, Determining whether the maximum temperature exceeds the second predetermined temperature and whether the temperature continues to rise and a predetermined temperature difference is generated within a third predetermined time, In the case where the maximum temperature exceeds the second predetermined temperature and continues to rise for a third predetermined time and a predetermined temperature difference is generated, it is determined that a thermal runaway fault has occurred.
7. 7. The battery system based on a battery temperature sensor arrangement of claim 6, wherein the controller is further configured to: in case the maximum temperature does not exceed the second predetermined temperature, or the temperature does not continuously rise or a predetermined temperature difference is not generated within a third predetermined time, It is determined whether the maximum temperature is below a third predetermined temperature, In the case where the highest temperature is lower than the third predetermined temperature, it is determined that no thermal runaway failure has occurred, Wherein the third predetermined temperature is less than the second predetermined temperature.
8. 8. The battery system based on a battery temperature sensor arrangement of claim 7, wherein the controller is further configured to: In case the highest temperature exceeds a third predetermined temperature, It is determined whether the maximum temperature exceeds a second predetermined temperature, In the case where the maximum temperature exceeds the second predetermined temperature, after the fourth predetermined time, it is newly judged whether the maximum temperature is continuously increased for the third predetermined time and a predetermined temperature difference is generated, In the case where the maximum temperature does not exceed the second predetermined temperature, it is determined that a thermal runaway fault has occurred.
9. 9. The battery system based on a battery temperature sensor arrangement of claim 7, wherein the controller is further configured to: Determining whether the lowest temperature is lower than a fourth predetermined temperature, And determining that the low-temperature fault occurs under the condition that the lowest temperature is lower than the fourth preset temperature.
10. 10. The battery system based on a battery temperature sensor arrangement of claim 9, wherein the controller is further configured to: In case the lowest temperature is not lower than the fourth predetermined temperature, It is determined whether the maximum temperature exceeds a fifth predetermined temperature, In the case that the highest temperature exceeds the fifth preset temperature, determining that the overtemperature fault occurs, Wherein the fifth predetermined temperature is greater than the fourth predetermined temperature.
11. 11. The battery system based on a battery temperature sensor arrangement of claim 10, wherein the controller is further configured to: In case the highest temperature does not exceed the fifth predetermined temperature, It is determined whether the maximum temperature exceeds a sixth predetermined temperature, In the case where the highest temperature exceeds the sixth predetermined temperature, the charge power of the battery is made 0, or the maximum discharge power of the battery is determined and the power of the battery is made equal to or less than the maximum discharge power, Wherein the sixth predetermined temperature is less than the fifth predetermined temperature.
12. 12. The battery system based on a battery temperature sensor arrangement of claim 3, wherein the controller is further configured to: Under the condition of charging the battery, determining the charging power of the battery at the highest temperature and the charging power of the battery at the lowest temperature by searching a charging power meter by utilizing the determined highest temperature, the determined lowest temperature and the battery electric quantity, and comparing the determined charging powers to determine the smaller of the charging powers as the maximum charging power of the battery; In the case of discharging the battery, the discharge power of the battery at the highest temperature and the discharge power at the lowest temperature are determined by looking up a discharge power table using the determined highest temperature and lowest temperature and the battery power, and the determined discharge powers are compared to determine the smaller of the discharge powers as the maximum discharge power of the battery.
13. 13. A battery power control method, the battery having a plurality of cells and a cooling block disposed over the cells, the method comprising: Sensing the temperature of the battery cell with at least one first temperature sensor, at least one second temperature sensor, and at least one third temperature sensor; Judging whether a thermal runaway fault, an overtemperature fault or a low temperature fault occurs in the battery by using the sensed temperatures of the first temperature sensor, the second temperature sensor and the third temperature sensor; wherein the at least one first temperature sensor is disposed adjacent to the explosion-proof valve of the at least one electrical cell; at least one second temperature sensor is arranged at the lower part of the at least one battery cell; At least one third temperature sensor is disposed on an upper portion of the at least one cell.
14. 14. The method of claim 13, further comprising: comparing the sensed temperatures of the first, second and third temperature sensors and determining a maximum temperature and a minimum temperature; And judging whether the battery has thermal runaway fault, overtemperature fault or low temperature fault by using the determined highest temperature and lowest temperature.
15. 15. The method of claim 14, further comprising: under the condition that the battery is judged to have a thermal runaway fault or an overtemperature fault or a low temperature fault or other serious faults, or the charging voltage of the battery reaches a charging cut-off voltage or the discharging voltage of the battery reaches a discharging cut-off voltage, the charging power or the discharging power of the battery is set to be 0; In the case where it is judged that the thermal runaway failure does not occur and the over-temperature failure does not occur and the low-temperature failure does not occur and other serious failures do not occur and the charge voltage of the battery does not reach the charge cutoff voltage and the discharge voltage of the battery does not reach the discharge cutoff voltage, the maximum charge power or the maximum discharge power of the battery is determined and the power of the battery is made equal to or less than the maximum charge power or the maximum discharge power.
16. 16. The method of claim 13, further comprising: Determining whether the maximum temperature exceeds a first predetermined temperature and continues for a first predetermined time, In the event that the maximum temperature exceeds the first predetermined temperature for a first predetermined time, it is determined that a thermal runaway fault has occurred.
17. 17. The method of claim 16, further comprising: In case the maximum temperature does not exceed the first predetermined temperature, or does not last for a first predetermined time, Determining whether the highest temperature exceeds a second predetermined temperature for a second predetermined time, and whether one third or more of the total number of the first temperature sensor, the second temperature sensor, and the third temperature sensor is disconnected for the second predetermined time, In the case where the highest temperature exceeds the second predetermined temperature for a second predetermined time, and one third or more of the total number of the first temperature sensor, the second temperature sensor, and the third temperature sensor are disconnected for the second predetermined time, it is determined that a thermal runaway fault occurs, Wherein the second predetermined temperature is less than the first predetermined temperature.
18. 18. The method of claim 17, further comprising: In the case where the highest temperature does not exceed the second predetermined temperature or does not last for the second predetermined time, or one third or more of the total number of the first temperature sensor, the second temperature sensor and the third temperature sensor is not disconnected or does not last for the second predetermined time, Determining whether the maximum temperature exceeds the second predetermined temperature and whether the temperature continues to rise and a predetermined temperature difference is generated within a third predetermined time, In the case where the maximum temperature exceeds the second predetermined temperature and continues to rise for a third predetermined time and a predetermined temperature difference is generated, it is determined that a thermal runaway fault has occurred.
19. 19. The method of claim 18, further comprising: in case the maximum temperature does not exceed the second predetermined temperature, or the temperature does not continuously rise or a predetermined temperature difference is not generated within a third predetermined time, It is determined whether the maximum temperature is below a third predetermined temperature, In the case where the highest temperature is lower than the third predetermined temperature, it is determined that no thermal runaway failure has occurred, Wherein the third predetermined temperature is less than the second predetermined temperature.
20. 20. The method of claim 19, further comprising: In case the highest temperature exceeds a third predetermined temperature, It is determined whether the maximum temperature exceeds a second predetermined temperature, In the case where the maximum temperature exceeds the second predetermined temperature, after the fourth predetermined time, it is newly judged whether the maximum temperature is continuously increased for the third predetermined time and a predetermined temperature difference is generated, In the case where the maximum temperature does not exceed the second predetermined temperature, it is determined that a thermal runaway fault has occurred.

Description

Battery system based on battery temperature sensor arrangement and battery power control method Technical Field The invention relates to a battery system based on a battery temperature sensor arrangement and a method for controlling battery power. Background The battery system of a vehicle is composed of a plurality of battery cells, and temperature control of the entire battery system is a key factor affecting battery performance and life. Currently, some technologies consider only the placement of temperature sensors inside the cells, which is not practical to place inside all cells in a battery system of a vehicle, and this increases costs. In addition, if the temperature sensor is placed on a part of the battery cells, the consistency of the detection of the battery cells may be affected. The above description of the background is only for the purpose of facilitating a thorough understanding of the present invention's aspects (in terms of the means of technology used, the technical problems solved, and the technical effects produced, etc.) and should not be taken as an admission or any form of suggestion that the above constitutes prior art already known to those skilled in the art. Disclosure of Invention In view of the drawbacks of the prior art, an object of the present invention is to provide a battery system and a battery power control method based on a battery temperature sensor arrangement, which can sense the temperatures of the battery cells at different locations by placing the temperature sensor at different locations outside the battery cells, and can judge whether the battery fails and the type of the failure according to the sensed temperatures, thereby controlling the battery power, and thus improving the battery life and the battery safety. A battery system based on a battery temperature sensor arrangement according to an exemplary embodiment of the present invention has a plurality of battery cells and a cooling block arranged above the battery cells, and may include at least one first temperature sensor arranged adjacent to an explosion-proof valve of the at least one battery cell for sensing a temperature of the battery cell, at least one second temperature sensor arranged at a lower portion of the at least one battery cell for sensing a temperature of the battery cell, at least one third temperature sensor arranged at an upper portion of the at least one battery cell for sensing a temperature of the battery cell, and a controller receiving the sensed temperatures of the first temperature sensor, the second temperature sensor, and the third temperature sensor and judging whether the battery has a thermal runaway failure, an overtemperature failure, or a low temperature failure based on the sensed temperatures of the first temperature sensor, the second temperature sensor, and the third temperature sensor. The controller may be configured to compare sensed temperatures of the first, second and third temperature sensors and determine a maximum temperature and a minimum temperature, and determine whether a thermal runaway fault, an overtemperature fault or a low temperature fault has occurred in the battery using the determined maximum temperature and minimum temperature. The controller may be further configured to, in a case where it is determined that the thermal runaway failure or the over-temperature failure or the low-temperature failure or other serious failure of the battery occurs or the charge voltage of the battery reaches the charge cutoff voltage or the discharge voltage of the battery reaches the discharge cutoff voltage, make the charge power or the discharge power of the battery 0, and in a case where it is determined that the thermal runaway failure does not occur and the over-temperature failure does not occur and the low-temperature failure does not occur and other serious failure does not occur and the charge voltage of the battery does not reach the charge cutoff voltage and the discharge voltage of the battery does not reach the discharge cutoff voltage, determine the maximum charge power or the maximum discharge power of the battery and make the power of the battery less than or equal to the maximum charge power or the maximum discharge power. The controller may be further configured to determine whether the maximum temperature exceeds a first predetermined temperature for a first predetermined time, and determine that a thermal runaway fault has occurred if the maximum temperature exceeds the first predetermined temperature for the first predetermined time. The controller may be further configured to determine whether a thermal runaway fault has occurred if the maximum temperature does not exceed the first predetermined temperature or if the maximum temperature does not last for the first predetermined time, if the maximum temperature exceeds the second predetermined temperature and last for the second predetermined time, and if one third or more of the total numbe