Battery pack and method for preventing overheating misdiagnosis due to ambient temperature

Abstract

The present invention measures the internal temperature and external temperature of a battery pack at a predetermined cycle in different temperature sensors respectively disposed in a battery cell, a battery management system (BMS), and a pack case of the battery pack, compares these with predetermined reference values, performs overheat diagnosis of the battery, and in particular, provides a battery pack and an overheat diagnosis method capable of determining whether the cause of the overheat diagnosis is due to an internal factor or an external factor of the battery pack.

Description

Technical Field

[0001] The present invention relates to a technique for detecting overheating of a battery. In particular, the present invention relates to a battery pack and a detection method for distinguishing the cause of overheating of a battery between an increase in the temperature of the battery itself and an increase in temperature due to external environmental factors.

Background Art

[0002] During the operation of a battery, overheating diagnosis is often performed due to an increase in the temperature of the battery. In such a case, it is often difficult to determine whether the cause is due to an increase in the temperature of the battery itself or an increase in the temperature of the external environment.

[0003] Regarding this, in Patent Document 1, in order to solve the problem in the case of determining an abnormal temperature state based only on the absolute temperature of the battery cell itself without reflecting any change in the peripheral temperature of the battery cell, temperature sensors are provided on the peripheral part of the battery cell and the surface of the battery cell, respectively, and the difference between the temperature of the battery cell itself and the temperature of the peripheral part of the battery cell is used to detect an increase in the peripheral temperature before the temperature of the battery cell rises, and a method for quickly diagnosing the abnormal temperature state of the battery cell is disclosed.

[0004] In Patent Document 2, in order to make the temperature of the battery cells uniform, the temperature of the pack in the pack case is measured, and a technique is disclosed for heating cells whose cell temperature is lower than the average value of the cell temperatures only when the temperature of the pack is lower than the appropriate temperature range to adjust the temperature of the pack to the appropriate temperature range.

[0005] However, neither of the above conventional techniques discloses a technique for distinguishing and diagnosing whether the overheating state of the battery is due to overheating of the cells or an increase in the temperature of the external environment.

Prior Art Documents

Patent Documents

[0006] [Patent Document 1] Republic of Korea Publication Patent No. 2021-0158123 (2021.12.30) [Patent Document 2] Republic of Korea Registered Patent No. 2054202 (December 4, 2019) [Overview of the project] [Problems that the invention aims to solve]

[0007] The present invention aims to provide a method for determining whether the cause of overheating due to rising battery pack temperature is due to rising battery cell temperature or rising external temperature, and a battery pack that enables this, which cannot be provided by the conventional technology described above. [Means for solving the problem]

[0008] To solve the above-mentioned problems, the present invention provides a battery pack comprising: one or more battery cells; a battery management system (BMS) that performs an overheat diagnosis of the battery pack as the internal temperature of the battery pack rises or the external temperature of the battery pack rises, and determines whether the cause of the overheat diagnosis is due to a rise in the internal temperature of the battery pack or a rise in the external temperature of the battery pack; a pack case that houses the battery cells and the BMS; one or more cell temperature sensors arranged adjacent to the battery cells and providing a measurement value for determining the rise in the internal temperature of the battery pack; and one or more pack temperature sensors arranged adjacent to the pack case and providing a measurement value for determining the rise in the external temperature of the battery pack.

[0009] At this time, the BMS receives measurements from the cell temperature sensor at predetermined intervals to determine if the internal temperature of the battery pack has risen, receives measurements from the pack temperature sensor at predetermined intervals to determine if the external temperature of the battery pack has risen, receives measurements from the cell temperature sensor and the pack temperature sensor to calculate the internal temperature and external temperature of the pack from each, and performs an overheat diagnosis of the battery pack based on the internal temperature and external temperature values ​​of the pack. If the external temperature value of the pack rises before the internal temperature value of the pack and an overheat diagnosis is made, the BMS determines that the cause of the overheat diagnosis is due to an external factor affecting the battery pack.

[0010] Furthermore, the battery pack of the present invention further comprises a BMS temperature sensor positioned adjacent to the BMS, and the BMS receives measured values ​​from the cell temperature sensor and the BMS temperature sensor at predetermined intervals to determine the rise in the internal temperature of the battery pack. The pack temperature sensor of the present invention is attached to the inner or outer surface of the pack case, but if it is attached to the inner surface, the pack case is provided with a temperature measurement hole at a position corresponding to the location where the pack temperature sensor is attached, and a heat dissipation film may be attached to the upper surface of the pack temperature sensor facing the outer surface of the pack case.

[0011] Furthermore, the present invention provides a battery pack overheating diagnosis system comprising one or more battery packs and a higher-level control unit that receives the internal temperature and external temperature of the battery packs from the battery packs and performs an overheating diagnosis of the battery packs. In the battery pack overheating diagnosis system, when the higher-level control unit performs an overheating diagnosis of the battery packs, if the external temperature of the battery packs rises to a predetermined standard value before the internal temperature of the battery packs, it determines that the overheating is due to external factors of the packs.

[0012] Furthermore, embodiments of the present invention provide a battery pack overheating diagnosis method that includes: a battery pack internal temperature measurement step of measuring the internal temperature of the battery pack at a predetermined interval; a battery pack external temperature measurement step of measuring the external temperature of the battery pack at a predetermined interval; a battery pack overheating diagnosis step of diagnosing whether the battery pack is overheating based on the internal and external temperatures of the battery pack; and an overheating diagnosis cause determination step of determining that the overheating diagnosis is a false diagnosis if the external temperature of the battery pack rises before the internal temperature of the battery pack in the overheating diagnosis step.

[0013] In this case, in the overheating diagnosis step, if the internal temperature of the pack is greater than a predetermined standard value, it is diagnosed as overheating of the battery pack. In the overheating diagnosis cause determination step, if the external temperature of the pack rises before the internal temperature of the pack, it is determined that the cause of the overheating diagnosis is due to a rise in the external temperature. In this case, the internal temperature of the pack is obtained from a battery cell housed inside the pack case of the battery pack or from a temperature sensor attached to the BMS, and the external temperature of the pack is obtained from a temperature sensor attached to the pack case of the battery pack.

[0014] Furthermore, embodiments of the present invention provide an overheat diagnosis method for a battery system comprising one or more battery packs equipped with separate temperature sensors to measure the internal and external temperatures of each battery pack, and a higher-level controller that receives the internal and external temperatures of each battery pack from the battery packs. The method includes: a battery pack temperature measurement step in which each battery pack measures the internal and external temperatures of each battery pack; a measurement reception step in which a higher-level controller receives the measured values ​​of the internal and external temperatures of each battery pack; an overheat diagnosis step in which the higher-level controller performs an overheat diagnosis of each battery pack based on the received measured values ​​of the internal and external temperatures of each battery pack; and an overheat diagnosis cause determination step in which the higher-level controller determines whether the cause of the overheat diagnosis is due to an internal factor or an external factor of the battery pack.

[0015] In this case, each battery pack measures the internal temperature and the external temperature using different temperature sensors mounted at different locations on the battery pack. The internal temperature is obtained from a temperature sensor attached to a battery cell or BMS housed inside the pack case of the battery pack, and the external temperature is obtained from a temperature sensor attached to the pack case of the battery pack. [Effects of the Invention]

[0016] According to embodiments of the present invention, the internal and external temperatures of the battery pack are measured at predetermined intervals by different temperature sensors arranged in the battery cells, BMS, and pack case of the battery pack, and these are compared with predetermined reference values ​​to diagnose battery overheating. In particular, by determining whether the cause of the overheating diagnosis is due to internal or external factors of the battery pack, it is possible to prevent false diagnoses of overheating or to pinpoint the cause of the overheating diagnosis, thereby increasing the efficiency of battery operation.

[0017] The drawings attached to this specification illustrate desirable embodiments of the present invention and are for the purpose of further understanding the technical idea of the present invention together with the detailed description of the invention mentioned above. Therefore, the present invention is not to be construed as being limited only to the matters described in the drawings.

Brief Description of the Drawings

[0018] [Figure 1] FIG. It is a diagram showing the structure of a battery pack according to an embodiment of the present invention. [Figure 2] FIG. It is a diagram showing a structure in which a cell temperature sensor according to an embodiment of the present invention is attached to a battery cell. [Figure 3] FIG. It is a diagram showing a structure in which a BMS temperature sensor according to an embodiment of the present invention is attached to the BMS. [Figure 4] FIG. It is a diagram showing the structure of a pack case according to an embodiment of the present invention and a structure in which a pack temperature sensor is attached to the pack case. [Figure 5] FIG. It is a diagram showing the structure of a flexible printed circuit board (FPCB) provided with a temperature sensor according to an embodiment of the present invention. [Figure 6] FIG. It is a block diagram showing the configuration of a system in which a plurality of battery packs according to the present invention are controlled by an upper controller. [Figure 7] FIG. It is a flowchart showing a temperature diagnosis method for a battery pack according to the present invention.

Modes for Carrying Out the Invention

[0019] Hereinafter, based on the attached drawings, the structure and overheat diagnosis method of the battery pack according to the present invention will be described.

[0020] 1. Structure of the battery pack 100 according to the present invention The battery pack 100 according to the present invention comprises a plurality of battery cells 10, a battery management system (BMS) 20 for managing the battery cells, a battery pack case 30 for housing the plurality of battery cells and the BMS, one or more first sensors 40 for measuring the temperature of the battery cells, and one or more pack temperature sensors 60 for measuring the temperature of the battery pack. It may also further comprise one or more BMS temperature sensors 50 for measuring the temperature of the BMS.

[0021] (1) Battery cell 10 The battery pack 100 of the present invention comprises a standard battery cell 10. One or more cell temperature sensors 40 for measuring the cell temperature are attached to the battery cell 10.

[0022] The cell temperature sensor 40 can be attached to the battery cell via an FPCB 70 for mounting temperature sensors, as shown in Figure 2. Figure 2(a) is a cross-sectional view from the side showing how two cell temperature sensors 40 are attached to different positions on the battery cell 10 using an FPCB 70 for mounting temperature sensors, and Figure 2(b) is a view from above showing how the cell temperature sensors 40 are attached.

[0023] (2) BMS 20 The battery pack 100 of the present invention includes a standard BMS 20. A BMS temperature sensor 50 for measuring the temperature around the BMS 20 is mounted on the circuit board that constitutes the BMS 20. As shown in the block diagram of Figure 3, the BMS temperature sensor 50 can be arranged around other elements 21 that constitute the BMS 20, and detailed circuit patterns such as the connections between elements are omitted from the block diagram of Figure 3.

[0024] The BMS 20 of the present invention adopts the structure of a conventional BMS, but its function is to perform the battery pack temperature diagnosis method according to the present invention.

[0025] The BMS 20 reads temperature measurement signals from the cell temperature sensor 40, the pack temperature sensor 60, or the BMS temperature sensor 50 at the location where each sensor is mounted, and calculates the cell temperature, the BMS temperature, and the pack case temperature based on these signals. The pack case temperature calculated from the measurement value of the pack temperature sensor 60 is used to calculate the ambient temperature outside the battery pack 100.

[0026] The BMS 20 uses the temperature of these cells and the pack case, or the temperature around the BMS, to diagnose overheating of the battery pack. If overheating is diagnosed, it determines whether the cause of the overheating is due to an increase in the temperature of the internal battery cells or the BMS, or an increase in the temperature of the external environment surrounding the battery pack 100. The specific procedures and methods for determining whether the cause of the overheating is an increase in the internal temperature of the battery pack or an increase in the external temperature of the battery pack are described below.

[0027] (3) Pack case 30 As shown in Figure 1, the pack case 30 of the present invention houses a plurality of battery cells 10 and a BMS 20, and is equipped with one or more pack temperature sensors 60.

[0028] The pack temperature sensor 60 can be mounted on the outer surface of the pack case 30, as shown in Figure 4(a), or on the inner surface of the pack case 30, as shown in Figure 4(b). When mounted on the inner or outer surface of the pack case 30, it can be mounted on the FPCB 70 for sensor mounting, as shown in Figure 4.

[0029] On the other hand, as shown in Figures 4(c) and 4(d), the pack case 30 of the present invention may also be provided with a temperature measurement hole 31. In particular, when a pack temperature sensor 60 is disposed on the inner surface of the pack case 30, the temperature measurement hole 31 is formed in accordance with the mounting position of the pack temperature sensor 60, so that the pack temperature sensor 60 is more affected by the external temperature than the internal temperature of the pack case 30, and the pack temperature sensor 60 becomes more sensitive to the temperature of the external environment.

[0030] As shown in Figure 4(c), the upper surface of the FPCB 70 for sensor mounting, which faces the inner surface of the pack case 30 of the pack temperature sensor 60, i.e., the upper surface of the pack temperature sensor, may be configured such that heat is dissipated by a heat-insulating film 72, thereby further reducing the sensitivity of the pack temperature sensor 60 to the internal temperature of the pack case 30.

[0031] On the other hand, Figures 4(c) and 4(d) show a configuration in which a temperature transmission pin 32 is placed in the temperature measurement hole 31 for the purpose of sealing, such as for water discharge, or for the purpose of transmitting external temperature. One end of the temperature transmission pin 32 is in contact with a pack temperature sensor 60 attached to the inner surface of the pack case, and the other end is exposed to the outside of the pack case 30 through the temperature measurement hole 31, transmitting the temperature outside the pack case 30 to the pack temperature sensor 60.

[0032] In Figure 4(d), a gap is shown between the temperature measurement hole 31 and the temperature transfer pin 32, but this is shown for identification purposes in the figure. In reality, for sealing the case, the gap between the temperature transfer pin 32 and the inner surface of the temperature measurement hole 31 may be filled with the same material as the temperature transfer pin 32, or with the same material as the pack case 30 or with a heat transfer material. The temperature transfer pin 32 may be formed from a known heat transfer material for the purpose of more effectively transferring the temperature outside the pack case 30 to the pack temperature sensor 60.

[0033] As shown in Figure 4, the pack temperature sensor 60 may be mounted on an FPCB 31 (Flexible Printed Circuit Board) with printed wiring for signal connection to the BMS 20, and this FPCB may be attached to the inner or outer surface of the pack case 30 so that the pack temperature sensor 60 measures the temperature of the pack case 30.

[0034] (4) Cell temperature sensor 40 The cell temperature sensor 40 is positioned on the surface of the battery cell 10 and is connected to measure the surface temperature of the cell at predetermined intervals and to pass a signal to the BMS for calculating the measured temperature.

[0035] The cell temperature sensor 40 can be attached to the surface of each of the multiple battery cells 10 in order to calculate the temperature of each of the multiple battery cells 10, and can be attached to multiple locations on the individual battery cells 10 as shown in Figure 2.

[0036] (5) BMS temperature sensor 50 The BMS temperature sensor 50 is installed on the BMS 20 to measure the ambient temperature. As shown in Figure 3, it is installed on the printed circuit board (PCB) that makes up the BMS 20 to measure the temperature around the BMS 20.

[0037] The placement of the BMS temperature sensor 50 of the present invention is not limited to the PCB of the BMS, but can also be configured to be mounted on an FPCB 70 for sensor mounting and attached around the BMS 20.

[0038] (6) Pack temperature sensor 60 As described above based on Figure 4, one or more pack temperature sensors 60 are attached to the inner or outer surface of the pack case 30 and are configured to measure the temperature outside the pack case 30, rather than the temperature of the battery cells 10 or the BMS 20, and to transmit the measured value to the BMS 20.

[0039] (7) FPCB 70 for sensor installation In the present invention, the mounting configuration of the pack temperature sensor is not limited in any particular way. However, one embodiment of the mounting configuration is shown in Figure 5, in which the sensor is mounted on the inner or outer surface of the battery cell 10, BMS 20, or pack case 30 via an FPCB 70 for sensor mounting. The specific circuit pattern is not shown in Figure 5.

[0040] As shown in Figure 5, the FPCB 70 for sensor mounting has a sensor mounting section 73 on which a temperature sensor is mounted. The temperature sensor is attached to the sensor mounting section 73 to form a temperature measurement location, and the temperature sensor connection wire 71 of the FPCB 70 for sensor mounting is connected to the wiring pattern of the FPCB 70 to which the temperature sensors 40, 50, and 60 are connected, so that the measured values ​​from the sensors are transmitted to the BMS 20. When the FPCB 70 for sensor mounting, which has the pack temperature sensor 60 mounted on it, is attached to the outer surface of the pack case 30, it is connected to the inside of the pack case 30 in order to deliver the measured values ​​of the pack temperature sensor 60 to the BMS 20. For this purpose, the pack case 30 may have a wiring connection hole (not shown) for the internal connection of the temperature sensor connection wire 71.

[0041] 2. Battery pack overheating diagnostic system 200 Figure 6 shows the configuration of a battery pack overheating diagnostic system 200 that performs overheating diagnostics on a battery pack 100 in a battery system comprising one or more n battery packs 100_a (a=1, 2, 3, ..., n) as described above.

[0042] The battery temperature diagnostic system is a battery system comprising one or more n battery packs 100_a (a=1, 2, 3, ..., n), wherein each battery pack 100 is equipped with a cell temperature sensor or a pack temperature sensor to measure the internal and external temperatures of the battery pack, and when performing an overheat diagnosis of each battery pack 100, the BMS 20 of each battery pack 100 uses the measured values ​​from the cell temperature sensor or pack temperature sensor to determine whether the cause of the overheat diagnosis is due to an increase in the internal temperature of the battery pack 100 or an increase in the external temperature, and transmits the result of the determination to the higher-level control unit 210.

[0043] The upper-level control unit 210 may be a battery rack BMS (Rack BMS) composed of multiple battery packs 100, or it may be the control unit of a system comprising multiple battery packs 100 and multiple battery racks.

[0044] In another embodiment, the BMS 20 of the battery pack 100 transmits temperature measurements to the higher-level control unit 210, which receives the temperature measurement results for each battery pack 100 and, based on this, performs an overheat diagnosis for each battery pack 100, and determines whether the cause of the overheat diagnosis is due to an increase in the internal temperature of the battery pack or an increase in the external temperature of the battery pack.

[0045] The specific procedures and methods for determining whether the cause of the overheating diagnosis is due to an increase in the internal temperature of the battery pack or an increase in the external temperature of the battery pack will be described below.

[0046] 3. Method for diagnosing battery pack overheating Based on Figure 7, the battery pack overheating diagnosis method according to the present invention will be described.

[0047] (1) Battery pack internal temperature measurement step (S10) This procedure involves the pack BMS 20 measuring the temperature of the battery cell 10 at predetermined intervals using at least one cell temperature sensor 40 attached to the battery cell 10.

[0048] The battery pack internal temperature measurement step may further include a procedure in which the pack BMS 20 further measures the temperature of the BMS using a BMS temperature sensor 50 mounted around the BMS 20, in addition to the cell temperature sensor 40.

[0049] The BMS 20 can calculate the maximum measured temperature of the battery cell 10 and the BMS as the internal temperature of the battery and compare it with a predetermined first reference value to determine if overheating has occurred.

[0050] (2) Battery pack external temperature measurement step (S20) The BMS 20 determines the external temperature of the battery pack using measurements from at least one pack temperature sensor 60 attached to the case 30 of the battery pack 100. The BMS 20 can then compare the external temperature of the battery pack with a predetermined second reference value to determine if overheating has occurred.

[0051] (3) Battery pack overheating diagnostic step (S30) The BMS 20 performs an overheat diagnosis of the battery pack by comparing the internal temperature of the battery and the external temperature of the battery pack, measured in steps S10 and S20, with predetermined reference values.

[0052] In the battery pack overheating diagnosis step, if the internal temperature of the battery pack is higher than the predetermined first reference value, or if the external temperature of the battery pack is higher than the predetermined second reference value, overheating is diagnosed. The first reference value and the second reference value may be set to the same value or to different values.

[0053] In another embodiment, the battery pack overheating diagnosis step may be configured such that, in a predetermined temperature measurement cycle, even if the external temperature of the battery pack is higher than a second reference value, if the internal temperature of the battery pack is not higher than the predetermined first reference value, it does not diagnose battery overheating, and only diagnoses battery overheating if the internal temperature of the battery pack is higher than the predetermined first reference value.

[0054] (4) Steps for determining the cause of overheating (S40) The BMS 20 performs steps S10 to S30 at predetermined intervals, and if battery overheating is diagnosed in step S30 of the predetermined interval, it determines whether the overheating was diagnosed due to an increase in the internal temperature of the battery or due to an increase in the external temperature of the battery.

[0055] In other words, if, during a predetermined cycle, the external temperature of the battery is higher than a predetermined second reference value, but the internal temperature of the battery is not higher than a predetermined first reference value, even if the battery is determined to be overheating, it is judged that this is due to external factors affecting the battery, and not due to overheating of the battery cells or BMS. Even if the internal temperature of the battery rises above the predetermined first reference value in subsequent cycles, it is judged that the battery was diagnosed as overheating due to external factors affecting the battery, or that the overheating diagnosis was a misdiagnosis.

[0056] On the other hand, the battery pack overheating diagnosis step (S30) may be configured such that, in a predetermined temperature measurement cycle, even if the external temperature of the battery pack is higher than the second reference value, if the internal temperature of the battery pack is not higher than the predetermined first reference value, it does not diagnose battery overheating, and only diagnoses battery overheating when the internal temperature of the battery pack is higher than the predetermined first reference value. However, even in this case, in the overheating diagnosis cause determination step (S40), the BMS 20 determines that if the internal temperature of the battery pack rises above the predetermined first reference value, and the external temperature of the battery rises above the predetermined second reference value first, and then the internal temperature of the battery pack rises above the predetermined first reference value, then the cause of the overheating diagnosis is due to an external factor of the battery pack.

[0057] On the other hand, as shown in Figure 6, in a system equipped with multiple battery packs 100a (a=1, 2, …, n) and in which the upper control unit 210 performs overheat diagnosis of multiple battery packs, the method by which the upper control unit 210 performs overheat diagnosis of each battery pack is the same. The upper control unit 210 receives the results of the overheat diagnosis or the measured internal temperature and external temperature of the battery pack from each battery pack 100a via the procedure of steps S10 to S40 in each battery pack's BMS 20, and based on this, performs an overheat diagnosis for each battery pack and determines the cause of the overheat diagnosis.

[0058] In other words, the present invention provides an overheat diagnosis method for a battery system comprising one or more battery packs each equipped with separate temperature sensors to measure the internal temperature and external temperature of the battery packs, and a higher-level controller that receives the internal temperature and external temperature of each battery pack from the battery packs, the method comprising: a battery pack temperature measurement step in which each battery pack measures the internal temperature and external temperature of its respective battery pack; a measurement value reception step in which the higher-level controller receives the measured values ​​of the internal temperature and external temperature of each battery pack; an overheat diagnosis step in which the higher-level controller performs an overheat diagnosis of each battery pack based on the received measured values ​​of the internal temperature and external temperature of each battery pack; and an overheat diagnosis cause determination step in which the higher-level controller determines whether the cause of the overheat diagnosis is due to an internal factor or an external factor of the battery pack.

[0059] In this case, each battery pack measures the internal temperature and the external temperature using different temperature sensors mounted at different locations on the battery pack. The internal temperature is obtained from a temperature sensor attached to a battery cell or BMS housed inside the pack case of the battery pack, and the external temperature is obtained from a temperature sensor attached to the pack case of the battery pack. These temperature sensors correspond to the cell temperature sensor 40, BMS temperature sensor 50, and pack temperature sensor 60 described above.

[0060] It should be easily understood by an ordinary engineer that the overheating diagnosis of each battery pack according to the present invention described above, or the determination of the cause of the overheating diagnosis, can be performed by equipping the BMS 20 or upper control unit 210 of each battery pack with a series of processor execution algorithms that perform each of the steps S10 to S40 of the overheating diagnosis method.

[0061] Thus, according to the battery pack and battery pack overheat diagnosis method of the present invention, when performing an overheat diagnosis for the stable operation of the battery, it is possible to distinguish whether the overheat diagnosis is due to overheating of the battery cells constituting the battery pack or the BMS itself, or to overheat diagnosis due to external environmental factors of the battery pack, thereby enabling more accurate battery operation.

[0062] The reference numerals and names of the components used in this invention are as follows: [Explanation of symbols]

[0063] 100 Battery Packs 200 Battery Pack Overheating Diagnostic System 10 battery cells 20 BMS 30 pack case 31 Temperature measurement hole 32 temperature transfer pins 40-cell temperature sensor 50 BMS temperature sensor 60-pack temperature sensors FPCB for 70 Sensors 71 Temperature sensor connection wire 72 Heat dissipation film 73 Sensor mounting section 210 Upper Control Unit

Claims

1. In a battery pack configured to perform overheating diagnosis, One or more battery cells, A battery management system that performs an overheat diagnosis of the battery pack as the internal temperature or external temperature of the battery pack rises, and determines whether the cause of the overheat diagnosis is due to the rise in the internal temperature of the battery pack or the rise in the external temperature, A pack case housing the battery cell and the battery management system, One or more cell temperature sensors are arranged adjacent to the battery cells and provide a measurement value for determining the rise in the internal temperature of the battery pack. One or more pack temperature sensors are attached to the inner or outer surface of the pack case and provide a measurement value for determining the rise in the external temperature of the battery pack. Equipped with, The aforementioned battery management system A battery pack that determines that the cause of overheating is due to an external factor of the battery pack when the external temperature of the battery pack is higher than a predetermined second reference value and the internal temperature of the battery pack is less than or equal to a predetermined first reference value.

2. A battery pack configured to perform overheat diagnosis of the battery pack, One or more battery cells, A battery management system that performs an overheat diagnosis of the battery pack as the internal temperature or external temperature of the battery pack rises, and determines whether the cause of the overheat diagnosis is due to the rise in the internal temperature of the battery pack or the rise in the external temperature, A pack case housing the battery cell and the battery management system, One or more cell temperature sensors are arranged adjacent to the battery cells and provide a measurement value for determining the rise in the internal temperature of the battery pack. One or more pack temperature sensors are attached to the inner or outer surface of the pack case and provide a measurement value for determining the rise in the external temperature of the battery pack. Equipped with, The aforementioned battery management system The system receives the measured values ​​from the cell temperature sensor at predetermined intervals to determine the rise in the internal temperature of the battery pack. The system receives the measured values ​​from the pack temperature sensor at predetermined intervals to determine the rise in the external temperature of the battery pack. The system receives measured values ​​from the cell temperature sensor and the pack temperature sensor, and calculates the internal temperature of the battery pack and the external temperature of the battery pack from these values, The battery pack is diagnosed for overheating based on the internal temperature value and the external temperature value of the battery pack. A battery pack that, when the external temperature of the battery pack rises before the internal temperature of the battery pack and is diagnosed as overheating, determines that the cause of the overheating diagnosis is due to an external factor of the battery pack.

3. A battery pack configured to perform overheat diagnosis of the battery pack, One or more battery cells, A battery management system that performs an overheat diagnosis of the battery pack as the internal temperature or external temperature of the battery pack rises, and determines whether the cause of the overheat diagnosis is due to the rise in the internal temperature of the battery pack or the rise in the external temperature, A pack case housing the battery cell and the battery management system, One or more cell temperature sensors are arranged adjacent to the battery cells and provide a measurement value for determining the rise in the internal temperature of the battery pack. One or more pack temperature sensors are attached to the inner or outer surface of the pack case and provide a measurement value for determining the rise in the external temperature of the battery pack. Equipped with, The pack temperature sensor is mounted on the inner surface of the pack case. The aforementioned pack case is A temperature measurement port is provided at a position corresponding to the location where the pack temperature sensor is attached. A battery pack in which a heat-insulating film is attached to the upper surface of the pack temperature sensor, which faces the inner surface of the pack case.

4. The aforementioned battery management system The system receives the measured values ​​from the cell temperature sensor at predetermined intervals to determine the rise in the internal temperature of the battery pack. The battery pack according to claim 1 or 3, wherein a measurement value from the pack temperature sensor is received at a predetermined interval to determine the rise in the external temperature of the battery pack.

5. The aforementioned battery management system The system receives measured values ​​from the cell temperature sensor and the pack temperature sensor, and calculates the internal temperature of the battery pack and the external temperature of the battery pack from these values, The battery pack is diagnosed for overheating based on the internal temperature value and the external temperature value of the battery pack. The battery pack according to claim 3, wherein if the external temperature of the battery pack rises before the internal temperature of the battery pack and overheating is diagnosed, it is determined that the cause of the overheating diagnosis is due to an external factor of the battery pack.

6. The system further comprises a battery management system temperature sensor positioned adjacent to the aforementioned battery management system, The battery pack according to claim 5, wherein the battery management system receives measured values ​​from the cell temperature sensor and the battery management system temperature sensor at predetermined intervals to determine an increase in the internal temperature of the battery pack.

7. The pack temperature sensor is mounted on the inner surface of the pack case. The aforementioned pack case is The battery pack according to claim 1 or 2, further comprising a temperature measurement hole at a position corresponding to the location where the pack temperature sensor is attached.

8. The aforementioned pack case is The battery pack according to claim 7, further comprising a temperature transmission pin that transmits the external temperature of the battery pack to the pack temperature sensor attached to the inner surface of the pack case via the temperature measurement hole.

9. The battery pack according to claim 6, wherein a heat-insulating film is attached to the upper surface of the pack temperature sensor that faces the inner surface of the pack case.

10. One or more battery cells, A pack case for housing the aforementioned battery cells, One or more cell temperature sensors are positioned adjacent to the aforementioned battery cells and provide a measurement value for determining the rise in the internal temperature of the battery pack. One or more pack temperature sensors are attached to the inner or outer surface of the pack case and provide a measurement value for determining the rise in the external temperature of the battery pack. Includes a battery pack, A higher-level control unit receives measured values ​​of the internal temperature and external temperature of the battery pack from the battery pack and performs an overheat diagnosis of the battery pack. Equipped with, The aforementioned higher-level control unit, A battery pack overheating diagnostic system that determines that the cause of the overheating diagnosis is due to an external factor of the battery pack when the external temperature value of the battery pack is higher than a predetermined second reference value, and the internal temperature value of the battery pack is less than or equal to a predetermined first reference value.

11. One or more battery cells, A pack case for housing the aforementioned battery cells, One or more cell temperature sensors are positioned adjacent to the aforementioned battery cells and provide a measurement value for determining the rise in the internal temperature of the battery pack. One or more pack temperature sensors are attached to the inner or outer surface of the pack case and provide a measurement value for determining the rise in the external temperature of the battery pack. Includes a battery pack, A higher-level control unit receives measured values ​​of the internal temperature and external temperature of the battery pack from the battery pack and performs an overheat diagnosis of the battery pack. Equipped with, The aforementioned higher-level control unit, A battery pack overheating diagnostic system that, when diagnosing overheating of the battery pack, determines that the overheating is due to external factors of the battery pack if the external temperature of the battery pack rises to a predetermined standard value before the internal temperature of the battery pack.

12. One or more battery cells, A pack case for housing the aforementioned battery cells, One or more cell temperature sensors are positioned adjacent to the aforementioned battery cells and provide a measurement value for determining the rise in the internal temperature of the battery pack. One or more pack temperature sensors are attached to the inner or outer surface of the pack case and provide a measurement value for determining the rise in the external temperature of the battery pack. Includes a battery pack, A higher-level control unit receives measured values ​​of the internal temperature and external temperature of the battery pack from the battery pack and performs an overheat diagnosis of the battery pack. Equipped with, The pack temperature sensor is mounted on the inner surface of the pack case. The aforementioned pack case is A temperature measurement port is provided at a position corresponding to the location where the pack temperature sensor is attached. A battery pack overheating diagnostic system, wherein a heat-insulating film is attached to the upper surface of the pack temperature sensor, which faces the inner surface of the pack case.

13. A battery pack internal temperature measurement step that measures the internal temperature of the battery pack at a predetermined interval, A battery pack external temperature measurement step, which measures the external temperature of the battery pack at a predetermined interval, A battery pack overheating diagnosis step, which involves performing an overheating diagnosis to determine whether the battery pack is overheating based on the internal temperature and external temperature of the battery pack, In the overheat diagnosis step, if the external temperature of the battery pack rises before the internal temperature of the battery pack, the overheat diagnosis is determined to be a false diagnosis in the overheat diagnosis determination step. A method for diagnosing battery pack overheating, including methods for the battery pack overheating.

14. In the overheating diagnosis step, If the internal temperature of the battery pack exceeds a predetermined standard value, the battery pack is diagnosed as overheating. In the step of determining the cause of the overheating diagnosis, The battery pack overheating diagnosis method according to claim 13, wherein if the external temperature of the battery pack rises before the internal temperature of the battery pack, it is determined that the cause of the overheating diagnosis is the rise in external temperature.

15. The internal temperature of the aforementioned battery pack is The temperature is obtained from the battery cells housed inside the pack case of the aforementioned battery pack or from a temperature sensor attached to the battery management system. The external temperature of the aforementioned battery pack is The method for diagnosing overheating of a battery pack according to claim 13 or 14, wherein the temperature is obtained from a temperature sensor attached to the pack case of the battery pack.

16. A method for diagnosing overheating in a battery system, comprising one or more battery packs equipped with separate temperature sensors to measure the internal and external temperatures of each battery pack, and a higher-level control unit that receives the internal and external temperatures of each battery pack from the battery packs, Each battery pack includes a battery pack temperature measurement step in which the internal and external temperatures of the battery pack are measured, The measurement reception step involves the upper control unit receiving the measured values ​​of the internal temperature and external temperature of each battery pack. The above-level control unit performs an overheating diagnosis step, which involves performing an overheating diagnosis of each battery pack based on the received internal temperature and external temperature measurements of each battery pack, A step to determine the cause of the overheating diagnosis, which determines whether the cause of the overheating diagnosis is due to an internal factor or an external factor of the battery pack, Includes, The steps for determining the cause of the overheating diagnosis are as follows: A method for diagnosing overheating of a battery system, comprising the step of determining that the cause of the overheating diagnosis is due to an external factor of the battery pack if the external temperature value of the battery pack is higher than a predetermined second reference value, and the internal temperature value of the battery pack is less than or equal to a predetermined first reference value.

17. The overheating diagnosis method for a battery system according to claim 16, wherein each battery pack measures the internal temperature and the external temperature using different temperature sensors mounted at different locations on each battery pack.

18. The aforementioned internal temperature is, The temperature is obtained from the battery cells housed inside the battery pack case or from a temperature sensor attached to the battery management system. The aforementioned external temperature is, The method for diagnosing overheating of a battery system according to claim 17, wherein the temperature is obtained from a temperature sensor attached to the outer or inner surface of the pack case of the battery pack.

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