Systems and methods for managing vehicle batteries

Abstract

This invention relates to systems and methods for managing vehicle batteries. A system for managing a vehicle battery is disclosed, the vehicle battery being chargeable / dischargeable and storing energy for driving a vehicle drive motor. The disclosed system for managing a vehicle battery includes a controller that receives the voltage of each of a plurality of battery cells in the vehicle battery, the temperature of the vehicle battery, and the insulation resistance of the vehicle battery; determines a reference value based on the deviation between the voltages of the plurality of battery cells and the temperature of the vehicle battery; and determines whether the vehicle battery is malfunctioning by comparing the determined reference value with the insulation resistance.

Description

Technical Field

[0001] This invention relates to a system and method for managing vehicle batteries, and more specifically, to a system and method for managing vehicle batteries that effectively monitors the battery status while the vehicle is parked after charging, thereby enabling the prevention of various problems that may occur in the battery while the vehicle is parked. Background Technology

[0002] Generally, environmentally friendly vehicles powered by electricity utilize electrical energy stored in batteries to drive an electric motor, which in turn powers the vehicle. The dynamic performance of such vehicles is closely related to battery performance; therefore, effective monitoring and management of the batteries are essential.

[0003] Generally, the batteries in environmentally friendly vehicles are managed by a controller commonly known as a Battery Management System (BMS). The BMS collects various information from the battery for battery management (battery voltage, battery current, battery temperature, etc.) and applies the collected information to various pre-stored algorithms to calculate various parameters for battery management.

[0004] Traditional vehicle battery management technology primarily operates while power is being supplied to the battery management system, i.e., in the energized (IG ON) state. That is, the main relay connected to the battery monitors the battery's state while an electrical connection is established between the battery and other vehicle components (e.g., the power module, which converts power from the battery to provide converted power to the motor or charger, thereby generating power to charge the battery).

[0005] As mentioned above, in traditional vehicle battery management technology, since the information used for battery management is collected when the battery and other components are electrically connected, there is a problem that the collected information is affected by other components, thus preventing accurate battery status monitoring.

[0006] In particular, in recent years, fatal accidents such as battery fires have occurred frequently while vehicles are parked. Therefore, there is a need in the field of related technologies for a technology that can determine in advance whether the battery is abnormal while the vehicle is parked and provide a warning before an accident occurs.

[0007] The above description of the background art is only used to enhance the understanding of the background art of the present invention, and should not be regarded as an admission that they correspond to the prior art known to those skilled in the art. Summary of the Invention

[0008] Accordingly, the technical objective of this invention is to provide a system and method for managing vehicle batteries, which can determine in advance whether the battery is abnormal and issue a warning even when the battery is in an unloaded state after charging the battery in the vehicle.

[0009] To achieve the above objectives, the present invention provides a system for managing a vehicle battery, which is capable of charging / discharging and storing energy for driving a vehicle drive motor. The system includes a controller that receives the voltage of each of a plurality of battery cells in the vehicle battery, the temperature of the vehicle battery, and the insulation resistance of the vehicle battery. The controller determines a first reference value based on the deviation between the voltages of the plurality of battery cells and the temperature of the vehicle battery, and determines whether the vehicle battery is abnormal by comparing the determined first reference value with the insulation resistance.

[0010] In an embodiment of the present invention, the controller can determine the difference between the maximum and minimum voltages of multiple battery cells as the deviation.

[0011] In an embodiment of the present invention, when the received insulation resistance is less than a first reference value, the controller can determine that an abnormality has occurred in the vehicle battery.

[0012] In an embodiment of the present invention, as the deviation increases, the controller can increase the size of the first reference value.

[0013] In an embodiment of the present invention, as the temperature increases, the controller can increase the magnitude of the first reference value.

[0014] In an embodiment of the present invention, the controller can determine whether the vehicle battery is abnormal at each preset time period, and when the decrease in insulation resistance obtained by subtracting the current insulation resistance from the insulation resistance received just before the preset time period is greater than a second reference value, the controller can determine that an abnormality has occurred in the vehicle battery.

[0015] In an embodiment of the present invention, as the deviation increases, the controller can reduce the size of the second reference value.

[0016] In an embodiment of the invention, as the temperature increases, the controller can decrease the magnitude of the second reference value.

[0017] In one embodiment of the invention, the system may further include a combined dashboard or audio video navigation (AVN) that displays the occurrence of an abnormality in the battery when the controller determines that an abnormality has occurred.

[0018] In an embodiment of the invention, the instrument cluster or AVN may include a communication module that wirelessly transmits information about an abnormality in the battery to a vehicle management server or the driver's wireless terminal.

[0019] To achieve the above objectives, the present invention provides a method for managing a vehicle battery, the vehicle battery being capable of charging / discharging and storing energy for driving a vehicle drive motor. The method includes the following steps: a receiving step, receiving the voltage of each of a plurality of battery cells in the vehicle battery, the temperature of the vehicle battery, and the insulation resistance of the vehicle battery; a determining a first reference value step, determining a first reference value based on the deviation between the voltages of the plurality of battery cells and the temperature of the vehicle battery; and a determining whether the vehicle battery is abnormal step, determining whether the vehicle battery is abnormal by comparing the determined first reference value with the insulation resistance.

[0020] In an embodiment of the present invention, in the step of determining whether the vehicle battery is abnormal, if the received insulation resistance is less than a first reference value, it can be determined that an abnormality has occurred in the vehicle battery.

[0021] In an embodiment of the present invention, in the step of determining the first reference value, the magnitude of the first reference value may increase as the deviation increases.

[0022] In an embodiment of the present invention, in the step of determining the first reference value, the magnitude of the first reference value can increase with the increase of temperature.

[0023] In an embodiment of the present invention, the receiving step, the determining second reference value step, and the determining whether the vehicle battery is abnormal can be repeated for each preset time period. In the determining whether the vehicle battery is abnormal step, if the decrease in insulation resistance obtained by subtracting the current insulation resistance from the insulation resistance received just before the preset time period is greater than the second reference value, it can be determined that an abnormality has occurred in the vehicle battery.

[0024] In an embodiment of the present invention, in the step of determining the second reference value, the magnitude of the second reference value may decrease as the deviation increases.

[0025] In an embodiment of the present invention, in the step of determining the second reference value, the magnitude of the second reference value may decrease as the temperature increases.

[0026] In an embodiment of the present invention, the method may further include a display step, wherein when an abnormality is determined to have occurred in the battery in the step of determining whether the vehicle battery is abnormal, the occurrence of the abnormality in the battery is displayed on the instrument cluster or audio-visual navigation (AVN).

[0027] In an embodiment of the present invention, the display step may include: wirelessly transmitting the occurrence of an abnormality in the battery to a vehicle management server or the driver's wireless terminal.

[0028] Based on the systems and methods used to manage vehicle batteries, it is possible to determine whether a battery is malfunctioning based on its insulation resistance.

[0029] Specifically, systems and methods for managing vehicle batteries can more rigorously perform insulation resistance anomaly determination by utilizing other parameters (such as battery cell voltage deviation or battery temperature) that indicate battery anomalies to change the reference value used to determine insulation resistance anomalies.

[0030] Furthermore, systems and methods for managing vehicle batteries determine whether the battery insulation resistance is abnormal based on the amount of reduction in insulation resistance. This allows for rapid, proactive detection and warning of battery anomalies when insulation failure is underway while the vehicle is parked. Therefore, more serious problems such as battery fires can be prevented.

[0031] The effects achievable by this invention are not limited to those described above, and those skilled in the art will clearly understand from the following description other effects not mentioned. Attached Figure Description

[0032] Figure 1 This is a block diagram of a system for managing vehicle batteries according to an embodiment of the present invention.

[0033] Figure 2 This is a view illustrating an example of an insulation resistance measurement circuit for a battery applied to a vehicle battery management system according to an embodiment of the present invention.

[0034] Figure 3 , Figure 4 and Figure 5 This is a view used to illustrate various examples of battery anomaly determination techniques based on insulation resistance in a battery management system according to an embodiment of the present invention.

[0035] Figure 6 This is a flowchart illustrating a method for managing a vehicle battery according to an embodiment of the present invention.

[0036] Explanation of reference numerals in the attached figures

[0037] 10: Battery

[0038] 11: Battery Unit

[0039] 20: Battery Management System (BMS)

[0040] 30: Combined Dashboard

[0041] 40: AVN

[0042] 50: Main relay

[0043] 60: Inverter

[0044] 70: Drive motor

[0045] 80: Charger. Detailed Implementation

[0046] In the following, a system and method for managing a vehicle battery according to one embodiment of various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0047] Figure 1 This is a block diagram of a system for managing vehicle batteries according to an embodiment of the present invention.

[0048] Reference Figure 1 According to an embodiment of the present invention, a vehicle for managing a vehicle battery includes a battery 10 and a battery management system (BMS) 20. The battery 10 has a plurality of battery cells 11 and stores energy to provide energy to the vehicle's drive motor 70. The battery management system (BMS) 20 is equivalent to a controller that receives battery-related parameters including the voltage, current, temperature and insulation resistance of the battery 10, identifies the battery condition based on the received parameters to determine the insulation state of the battery, and determines whether the battery is abnormal based on the determined insulation state.

[0049] The controller of a vehicle according to an exemplary embodiment of the present invention may be a processor (e.g., a computer, microprocessor, CPU, ASIC, circuit, logic circuit, etc.). The controller may be implemented using non-volatile memory and a processor. The non-volatile memory stores software instructions such as programs and reproducible algorithms, wherein, when the software instructions of the programs and reproducible algorithms are executed, various functions described below are performed; the processor is configured to execute the software instructions of the programs and reproducible algorithms, etc. In this document, the memory and processor may be implemented as separate semiconductor circuits. Alternatively, the memory and processor may be implemented as a single integrated semiconductor circuit. The processor may be embodied as one or more processors.

[0050] The battery 10 can be implemented in the form of a battery pack, which includes multiple battery cells 11. The multiple battery cells 11 are interconnected in series and parallel to form the total voltage of the battery. The multiple battery cells 11 can form a unit voltage, and the total voltage of the battery 10 can be determined by the number of multiple battery cells 11 and their series / parallel connection relationship.

[0051] Figure 2This is a view illustrating an example of an insulation resistance measurement circuit for a battery applied to a system for managing vehicle batteries according to an embodiment of the present invention.

[0052] like Figure 2 As shown, the battery 10, implemented in the form of a group, can be internally equipped with a first insulation resistance measuring circuit 121 and a second insulation resistance measuring circuit 122. The first insulation resistance measuring circuit 121 measures the insulation resistance between the positive terminal (HV+) of the battery cell component 111 and the vehicle's chassis ground (chassis GND). The battery cells are connected in series and parallel to form a constant voltage. The second insulation resistance measuring circuit 122 measures the insulation resistance between the negative terminal (HV-) of the battery cell component 111 and the vehicle's chassis ground (chassis GND).

[0053] The insulation resistance value measured by each of the insulation resistance measurement circuits 121 and 122 can be provided to the battery management system 20, which acts as a controller.

[0054] The detailed circuit configuration of each of the insulation resistance measurement circuits 121 and 122 can be implemented using various topologies known in the art. In various embodiments of the invention, since the key feature is determining whether the vehicle battery is malfunctioning by utilizing the measured insulation resistance, rather than measuring the insulation resistance itself, additional descriptions of measuring the insulation resistance will be omitted.

[0055] Ideally, the positive terminal (HV+) and negative terminal (HV-) of battery 10 are insulated from the vehicle chassis ground (chassis GND). However, in a real vehicle environment, due to various factors, battery 10 and the vehicle chassis ground cannot form a perfect insulation state, and there is a high resistance value between them that is almost close to an insulation state or higher.

[0056] In other words, the resistance between each terminal of battery 10 and the vehicle chassis is called the insulation resistance, and this insulation resistance is ideally infinite, but in the actual vehicle environment, it has a high resistance value at or above a certain level.

[0057] However, the insulation resistance of battery 10 may decrease due to reasons such as moisture seeping into battery 10 or damage to battery 10. When current leakage occurs due to decreased insulation resistance, serious problems such as fire due to overcurrent may occur not only during vehicle operation but also when the vehicle is parked.

[0058] The system and method for managing vehicle batteries according to embodiments of the present invention can monitor the insulation resistance of the vehicle battery 10 even when the vehicle is parked. Specifically, more stringent battery monitoring can be performed by appropriately changing the reference value used to monitor the insulation resistance according to the battery condition.

[0059] Such battery monitoring can be performed by the battery management system (BMS) 20, which is equivalent to a controller.

[0060] The battery management system 20 can receive battery-related parameters such as the voltage, current, temperature and insulation resistance of the battery 10, and can determine whether an abnormality has occurred in the battery based on the input.

[0061] The battery management system 20 can be woken up by continuously receiving power or by receiving power at preset intervals, so that even when the battery 10 is disconnected from other electrical loads of the vehicle, i.e. when the vehicle is parked with the power off (ignition off), it can be determined whether the battery 10 is abnormal.

[0062] The detailed techniques for determining whether a battery malfunction has occurred, performed by the battery management system 20, will then be described in more detail.

[0063] Furthermore, a system for managing a vehicle battery according to an embodiment of the present invention may include a combination dashboard 30 or an audio video navigation (AVN) 40, which displays the occurrence of the abnormality when a battery abnormality is determined to occur in the battery management system 20, so as to notify an external vehicle management server or driver terminal.

[0064] exist Figure 1 In the figure, reference numeral "50" indicates the main relay that establishes or disconnects the electrical connection between the battery 10 and other components in the vehicle, reference numeral "60" indicates the inverter that converts the direct current (DC) power stored in the battery 10 into three-phase alternating current (AC) current for driving the motor 70, and reference numeral "80" indicates the charger that supplies charging power to the battery 10 for charging the battery.

[0065] The main relay 50 can be controlled by a controller (e.g., battery management system 20 or another on-board controller not shown) to be in a short-circuit / open state.

[0066] When vehicle drive is required, the controller short-circuit the main relay 50, allowing the power stored in the battery 10 to supply the inverter 60. The inverter 60 then converts the power to generate driving force in the drive motor 70. The drive motor 70 can be connected to the vehicle's drive shaft to rotate the drive shaft, thereby enabling the vehicle to move.

[0067] In addition, when the battery 10 needs to be charged, the controller controls the main relay 50 to be in a short-circuit state, so that the charging power provided by the charger 80 is applied to the battery 10 to charge the battery 10.

[0068] The charger 80 can be an on-board charger (OBC) installed in the vehicle and converting AC power supplied from an external charging facility into DC power capable of charging the battery 10, or it can be the charging facility itself located outside the vehicle that provides a high DC charging current for fast charging.

[0069] In the description of this invention, the vehicle's parking state refers to the state in which the vehicle's power is turned off after driving or charging is completed, i.e., the state in which the main relay 50 is disconnected. By disconnecting the main relay 50, the battery 10 can be in an unloaded state. However, as described above, even when the main relay 50 is disconnected, the battery management system 20 is always turned on by power input or by periodically receiving power to monitor the battery's insulation resistance and determine whether a battery abnormality has occurred based on the monitoring.

[0070] Figures 3 to 5 This is a view used to illustrate various examples of battery anomaly determination techniques based on insulation resistance in a battery management system according to an embodiment of the present invention.

[0071] The controller (battery management system 20) can determine whether battery 10 is malfunctioning based on the insulation resistance of battery 10. At its most basic level, such as... Figure 3 As shown, when the measured insulation resistance value is less than a preset reference value used to determine an insulation resistance anomaly, the controller can determine that a problem has occurred in the battery's insulation resistance.

[0072] In a system and method for managing a vehicle battery according to an embodiment of the present invention, a controller (battery management system 20) can collect battery-related parameters, such as the voltage of battery cell 11 and the temperature of battery 10, and can change and apply a reference value compared with insulation resistance based on the collected parameters.

[0073] For example, when the voltage deviation among the plurality of battery cells 11 included in battery 10 increases, the controller can increase and apply a reference value. Here, the voltage deviation can be the difference between the maximum and minimum voltages of the plurality of battery cells 11.

[0074] Generally, since the battery 10 is manufactured comprising multiple battery cells 11 with the same specifications, ideally, all battery cells 11 should have the same voltage. However, the voltages of the multiple battery cells 11 may vary due to errors in the manufacturing process of the battery cells 11, and under normal battery conditions, the voltage of the battery cells should remain within a preset allowable deviation.

[0075] If certain battery cells become abnormal due to external environmental factors or manufacturing defects of the battery cells themselves, the corresponding battery cells may have higher or lower voltages outside a certain range compared to the remaining normal battery cells. That is, the voltage deviation between the battery cells becomes a parameter capable of inferring the occurrence of an abnormality in the battery cells. When the voltage deviation between the battery cells becomes greater than a certain level, the possibility of an abnormality occurring in the battery cells is inferred to increase. By increasing the reference value compared with the insulation resistance and using this reference value, the occurrence of an abnormality can be determined more strictly.

[0076] As another example, the controller can increase the reference value as the temperature of the battery 10 increases and apply this reference value.

[0077] Similar to the voltage deviation between the battery cells 11, more heat can be generated in the abnormal battery cell 11 compared to other battery cells 11. Accordingly, the increase in the temperature of the battery 10 means a higher possibility of an abnormality occurring in the battery itself. Accordingly, in various embodiments of the present invention, when the temperature of the battery 10 increases beyond a certain level, by further increasing the reference value compared with the insulation resistance and using this reference value, the determination of the occurrence of an abnormality can be made more strictly.

[0078] The voltage and temperature of the battery cells can be realized by a voltage sensor and a temperature sensor, etc. The voltage sensor detects the voltage in the battery cell or in the battery cell module including the battery cell, and the temperature sensor, etc. is installed at any position within the battery pack. Since the means for detecting the voltage of the battery cell and the temperature of the battery are obvious to those skilled in the art, their detailed description will be omitted.

[0079] The controller can include a data map of reference values that change according to the voltage deviation of the battery cells and the temperature of the battery. Table 1 below shows an example of such a data map.

[0080] [Table 1]

[0081]

[0082] In Table 1 above, A1 < A2 < A3 < A4, B1 < B2 < B3 < B4, C1 < C2 < C3 < C4, and they are all positive numbers.

[0083] As shown in Table 1 above, when the voltage deviation of the battery cells is greater than the smallest reference value A1 and less than or equal to the next larger reference value A2, the smallest reference value C1 can be used to determine the insulation resistance abnormality. However, when the unit voltage deviation is greater than the reference value A2 and less than or equal to the reference value A3, the reference value C2 greater than the reference value C1 can be used to determine the insulation resistance abnormality.

[0084] like Figure 4 As shown, when the voltage deviation of the battery cell increases, and the reference value compared with the insulation resistance increases, in Figure 3 Insulation resistance that is determined to be normal within a measurement period of 2T can be identified as abnormal. That is, when the voltage deviation of the battery cell indicates a high probability of an abnormality, identifying insulation resistance abnormalities based on stricter standards can more safely prevent problems or accidents that may occur in the battery itself.

[0085] Similar to the voltage deviation of battery cells, as the battery temperature becomes greater than a larger reference value, the battery temperature also increases. Therefore, the reference value used to determine insulation resistance anomalies increases, allowing for more rigorous anomaly determination.

[0086] When both conditions are met simultaneously, or when only one of the two conditions is met, a change in the magnitude of the reference value used for comparison with the insulation resistance can be applied based on the conditions for voltage deviation of the battery cell and the temperature of the battery.

[0087] On the other hand, the system and method for managing vehicle batteries according to embodiments of the present invention can determine whether an anomaly has occurred based on the periodically measured changes in the magnitude of the insulation resistance and by comparing the magnitude of the insulation resistance itself with a reference value.

[0088] For example, such as Figure 5 As shown, when the insulation resistance measured in measurement time period T4 is lower than the insulation resistance measured in measurement time period T2 before measurement time period T4, and the magnitude of the decrease in insulation resistance is higher than the preset reference value, it can be determined that an abnormality has occurred in the battery.

[0089] Methods for determining abnormal battery insulation resistance can detect sudden battery anomalies that occur while the vehicle is parked, enabling a faster and more effective response.

[0090] As mentioned above, the reference value compared to the decrease in insulation resistance can also be changed based on the voltage deviation of the battery cell or the temperature of the battery. Table 2 below shows examples of such changes to the reference value.

[0091] [Table 2]

[0092]

[0093]

[0094] As shown in Table 2 above, in Table 2, A1 < A2 < A3 < A4 and B1 < B2 < B3 < B4. To strictly determine the occurrence of an abnormality in the battery, even a slight change in the insulation resistance should be able to determine the occurrence of an abnormality. Therefore, C1 > C2 > C3 > C4, and they are all positive numbers.

[0095] That is, as the voltage deviation of the battery cells increases and the temperature of the battery increases, the magnitude of the reference value compared with the decrease in the insulation resistance measurement value for each measurement period can decrease.

[0096] In Table 1 and Table 2 above, there are a total of four reference values compared with the insulation resistance and the decrease in the insulation resistance, but this is only an example. To determine more detailedly, the number of reference values can be increased, and the number of reference values can be decreased to exclude overly sensitive determinations.

[0097] Figure 6 is a flowchart showing a method for managing a vehicle battery according to an embodiment of the present invention.

[0098] Referring to Figure 6 , the method for managing a vehicle battery according to an embodiment of the present invention can start from step (S11), in which the controller (battery management system 20) receives the voltage of the battery cells 11, the temperature of the battery 10, and the insulation resistance of the battery 10.

[0099] Step (S11) can be executed in each preset period. Specifically, in the parking state where the main relay 50 connected to the battery 10 of the vehicle is disconnected, the controller can receive the voltage of the battery cells 11, the temperature of the battery 10, and the insulation resistance of the battery 10 in each preset period, and can perform battery abnormality determination based on the insulation resistance.

[0100] Next, the controller can calculate the voltage deviation of the battery cells, and can determine the reference value based on the calculated voltage deviation of the battery cells and the temperature of the battery (S12).

[0101] In step (S12), the controller can calculate the voltage deviation of the battery cells by subtracting the minimum value from the maximum value among the received voltages of the multiple battery cells 11. In addition, by using the data mapping for determining the reference value in Table 1 and Table 2 above, the first reference value compared with the magnitude of the measured insulation resistance and the second reference value compared with the decrease in the insulation resistance can be determined.

[0102] Next, the controller can compare the magnitude of the insulation resistance with the first reference value, and compare the decrease in the insulation resistance with the second reference value (S13, S14). If the insulation resistance does not decrease, step (S14) may not be executed.

[0103] When the insulation resistance itself is less than the first reference value, the possibility of insulation failure is high, and therefore an abnormality in the battery can be determined (S15). Furthermore, even if the decrease in insulation resistance compared to the insulation resistance measured just before the measurement period is greater than the second reference value, insulation failure is very likely underway, and therefore an abnormality in the battery can be determined (S15).

[0104] The controller can then send information about the occurrence of an insulation resistance abnormality related to battery 10 to the vehicle's instrument cluster 30 or AVN 40, so that the abnormality is displayed on the instrument cluster 30 or AVN 40 (S16). When the instrument cluster 30 or AVN 40 is equipped with a wireless communication module, it can notify the driver's wireless terminal of the abnormality in battery insulation resistance via the wireless communication module.

[0105] As described above, systems and methods for managing vehicle batteries according to various embodiments of the present invention can determine whether a battery is malfunctioning based on the insulation resistance of the vehicle battery.

[0106] Specifically, systems and methods for managing vehicle batteries according to various embodiments of the present invention can more rigorously perform insulation resistance anomaly determination by utilizing other parameters (such as voltage deviation of battery cells or temperature of the battery) that indicate battery anomalies to change the reference value used to determine insulation resistance anomalies.

[0107] Furthermore, systems and methods for managing vehicle batteries according to various embodiments of the present invention determine whether the battery insulation resistance is abnormal based on the amount of decrease in the battery's insulation resistance, enabling rapid early detection and warning of battery abnormalities when insulation failure is underway while the vehicle is parked. Therefore, more serious problems such as battery fires can be prevented.

[0108] Although specific embodiments of the invention have been shown and described above, it will be apparent to those skilled in the art that various modifications and alterations can be made to the invention within the scope of the claims.

Claims

1. A system for managing a vehicle battery that is chargeable / dischargeable and stores energy for driving a vehicle drive motor, the system comprising: a controller configured to: receive a voltage of each of a plurality of battery cells in the vehicle battery, a temperature of the vehicle battery, and an insulation resistance of the vehicle battery, determine a first reference value based on a deviation between the voltages of the plurality of battery cells and the temperature of the vehicle battery, determine whether an abnormality occurs in the vehicle battery by comparing the determined first reference value with the insulation resistance.

2. The system for managing a vehicle battery of claim 1, wherein, The controller determines a difference between a maximum value and a minimum value among the voltages of the plurality of battery cells as the deviation.

3. The system for managing a vehicle battery of claim 1, wherein, The controller determines that the abnormality occurs in the vehicle battery when a size of the received insulation resistance is smaller than the first reference value.

4. The system for managing a vehicle battery of claim 3, wherein, The controller increases a size of the first reference value as the deviation increases.

5. The system for managing a vehicle battery of claim 3, wherein, The controller increases the size of the first reference value as the temperature increases.

6. The system for managing a vehicle battery of claim 1, wherein, The controller determines whether the abnormality occurs in the vehicle battery at each predetermined time period, and determines that the abnormality occurs in the vehicle battery when a decrease amount of the insulation resistance is greater than a second reference value, wherein the decrease amount of the insulation resistance is obtained by subtracting a size of the insulation resistance received immediately before the predetermined time period from a size of the insulation resistance currently received.

7. The system for managing a vehicle battery of claim 6, wherein, The controller decreases a size of the second reference value as the deviation increases.

8. The system for managing a vehicle battery of claim 6, wherein, The controller decreases the size of the second reference value as the temperature increases.

9. The system for managing a vehicle battery according to claim 1, further comprising a combination panel or an audio video navigation, the combination panel or the audio video navigation displays the occurrence of the abnormality in the vehicle battery when the controller determines that the abnormality occurs in the vehicle battery.

10. The system for managing a vehicle battery of claim 9, wherein, The combination panel or the audio video navigation includes a communication module that wirelessly transmits the occurrence of the abnormality in the vehicle battery to a vehicle management server or a wireless terminal of a driver of the vehicle.

11. A method for managing a vehicle battery that is chargeable / dischargeable and stores energy for driving a vehicle drive motor, the method comprising the steps of: a receiving step of receiving a voltage of each of a plurality of battery cells in the vehicle battery, a temperature of the vehicle battery, and an insulation resistance of the vehicle battery; a determining first reference value step of determining a first reference value based on a deviation between the voltages of the plurality of battery cells and the temperature of the vehicle battery; a determining whether an abnormality occurs in the vehicle battery step of determining whether an abnormality occurs in the vehicle battery by comparing the determined first reference value with the insulation resistance.

12. The method for managing a vehicle battery of claim 11, wherein, In the determining first reference value step, a difference between a maximum value and a minimum value among the voltages of the plurality of battery cells is determined as the deviation.

13. The method for managing a vehicle battery of claim 11, wherein, In the determining whether an abnormality occurs in the vehicle battery step, it is determined that the abnormality occurs in the vehicle battery when a size of the received insulation resistance is smaller than the first reference value.

14. The method for managing a vehicle battery of claim 13, wherein, In the determining first reference value step, a size of the first reference value increases as the deviation increases.

15. The method for managing a vehicle battery of claim 13, wherein, In the determining first reference value step, the size of the first reference value increases as the temperature increases.

16. The method for managing a vehicle battery of claim 11, wherein, The receiving step, the determining second reference value step, and the determining whether the vehicle battery is abnormal step are repeated every predetermined period, and in the determining whether the vehicle battery is abnormal step, when the decrease in the insulation resistance is greater than the second reference value, it is determined that an abnormality has occurred in the vehicle battery, wherein the decrease in the insulation resistance is obtained by subtracting the size of the insulation resistance that was received immediately before the predetermined period from the size of the insulation resistance that is currently received.

17. The method for managing a vehicle battery of claim 16, wherein, In the determining second reference value step, the size of the second reference value decreases as the deviation increases.

18. The method for managing a vehicle battery of claim 16, wherein, In the determining second reference value step, the size of the second reference value decreases as the temperature increases.

19. The method for managing a vehicle battery of claim 11, wherein, Further comprising a displaying step of displaying the occurrence of the abnormality in the vehicle battery on an instrument panel or an audio video navigation when it is determined that an abnormality has occurred in the vehicle battery in the determining whether the vehicle battery is abnormal step.

20. The method for managing a vehicle battery of claim 19, wherein, The displaying step includes a step of wirelessly transmitting the occurrence of the abnormality in the vehicle battery to a vehicle management server or a wireless terminal of a driver of the vehicle.

Images