JP2007325458A - Vehicular battery pack uniformizing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress power required for a uniformizing process in a vehicular battery pack uniformizing system. <P>SOLUTION: The vehicular battery pack uniformizing system 10 includes: a plurality of temperature sensors 14 for a battery pack; a plurality of voltage sensors 16 for electric cells for composing the battery pack; a uniformizing circuit 22 for implementing a uniformized discharge from the battery pack; and a control block 300. A uniformization processing instructing section 36 is provided in the control block 30, and determines whether a uniformization processing section 38 is instructed to implement the uniformization process based on a temperature fluctuation. The uniformization processing section 38 includes: a processing condition setting module 40 for setting a processing condition for implementing the uniformization processing for a limited target period or intermittently based on the temperature fluctuation; a voltage monitoring module 42 for monitoring a voltage of each electric cell; and a uniformizing circuit implementing module 44 for actually implementing the discharge in the uniformizing circuit 22. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an assembled battery equalizing system for a vehicle, and more particularly to an assembled battery equalizing system for a vehicle that uses a power source for a vehicle to equalize a charging state or a discharging state of each battery constituting the assembled battery.

  As a secondary battery mounted on a vehicle, an assembled battery that generates a high voltage by combining a plurality of single cells is used. As the unit cell, a nickel metal hydride unit cell having an output voltage of about 1.2V or a lithium ion unit cell having an output voltage of about 3.6V is used. For example, in order to obtain an output voltage of about 200V, About 200 unit cells are combined, and about 60 unit cells are combined in the latter to form an assembled battery.

  Since the characteristics of the individual cells constituting the assembled battery are not necessarily the same, even if charging / discharging is performed for the entire assembled battery, the charged state and the discharged state of each single battery are not the same. In this way, if the charging state or discharging state of each unit cell constituting the assembled battery is different, there are unit cells that are overcharged or insufficiently charged when charging the entire assembled battery. The overall battery characteristics are degraded. Therefore, equalization processing is performed in order to equalize the charge state or discharge state of each unit cell constituting the assembled battery.

  For example, in Patent Document 1, as a method for controlling the state of charge of a battery pack in which a plurality of chargeable / dischargeable secondary batteries are connected in series as unit cells, the cell voltage variation between the cells is reduced even when the ignition switch is turned off. It is disclosed that when there is a charge command for performing equalization processing to eliminate, the engine operation is continued and the engine is stopped when the charge stop command is issued.

  Patent Document 2 describes that the equalization of the state of charge of each unit cell constituting the assembled battery is operated only when the ignition switch is off. When the ignition switch is off, the main current that passes through the battery pack does not flow, so the remaining capacity, which is the unit cell charge state, is correct in the unit cell voltage without being affected by the internal impedance of each unit cell. Since it is reflected, it is stated that the state of charge of each unit cell can be equalized correctly by operating the cell variation adjusting device in this state.

  In Patent Document 3, when charging an assembled battery composed of a plurality of batteries, if the constant voltage / current is applied to the entire assembled battery, the internal resistance differs for each battery. Or it is stated that a voltage shortage occurs. Then, the voltage and temperature of each battery can be detected, and the temperature of each battery can be individually controlled so that the voltage of each battery during charging is equal according to the temperature dependence of the internal resistance of each battery. It is stated.

  Patent Document 4 discloses that processing for equalizing variation in SOC, which is the remaining capacity of each cell, is performed in consideration of the remaining capacity of the 12V battery in a power storage device including a plurality of cells. Here, the equalization process is performed using the power of the 12V battery at the time of ignition off of the vehicle in order to ensure the implementation over a long period of time, but the 12V battery is not charged when the ignition is off. If the equalization process takes a long time, the 12V battery is overdischarged. Therefore, it is stated that the equalization process is stopped when the voltage or remaining capacity of the 12V battery is equal to or less than a predetermined value.

JP 2002-281687 A JP 2002-325370 A JP-A-8-37736 JP 2003-189490 A

  In order to perform the equalization process, a certain processing period is required, and for the equalization process, it is preferable to perform the battery pack under a constant voltage state. It is preferable not to use it. For these reasons, it is conceivable that the equalization process is performed during the period when the vehicle operation ends and the ignition is off. However, since this equalization processing uses a charging circuit or a discharging circuit, power is required for this purpose. Therefore, if the power of the vehicle power source is used during the ignition off period, the vehicle power source is charged. If it is not performed, the power of the vehicle power source is unilaterally consumed by performing the equalization process.

  The objective of this invention is providing the assembled battery equalization system for vehicles which can suppress the electric power which an equalization process requires.

  An assembled battery equalization system for a vehicle according to the present invention includes an equalization processing unit that equalizes a charging state or a discharging state of each battery constituting the assembled battery, and a plurality of temperature sensors that detect temperatures of different parts with respect to the assembled battery. And a control unit that controls the operation of the equalization processing unit based on the temperature state of the assembled battery, the control unit obtaining a temperature variation in the assembled battery based on detection values of a plurality of temperature sensors, and the assembled battery If the temperature variation in the above exceeds a predetermined range, the equalization processing unit is issued a command to perform the subsequent equalization processing, and if within the predetermined range, the command to perform no equalization processing is issued And command means.

  Further, it is preferable that the equalization command means sets a processing interval for performing the equalization process or a target period for performing the equalization process and issues a command for performing the equalization process.

  Moreover, it is preferable that an equalization instruction | indication means sets the process interval for performing an equalization process, or the object period for performing an equalization process according to the temperature variation of an assembled battery.

  The assembled battery equalization system according to the present invention further includes means for receiving an ignition stop request for stopping the operation of the vehicle engine, the equalization command means receives the ignition stop command, and temperature variation in the assembled battery is predetermined. When exceeding the range, it is preferable to issue a command to perform equalization processing thereafter to the equalization processing unit, and execute the ignition stop after the equalization command means issues the command.

  Further, when the equalization processing unit receives an instruction to perform equalization processing, the equalization processing unit initializes and starts a timer for setting a processing interval for performing equalization processing, and initializes the timer every time the processing interval is reached. A means for repeating, a means for monitoring the voltage state of the assembled battery every time the timer reaches the set processing interval, a means for determining whether or not a discharge for equalization is necessary, and a discharge for equalization. It is preferable to have means for performing equalization processing when it is determined that it is necessary to perform the above.

  Further, when the equalization processing unit receives a command to perform the equalization process, the equalization processing unit initializes and starts a timer for setting a target period for performing the equalization process, and a timer elapsed time from the execution of the ignition stop. Means for determining whether or not it is within the set target period, means for monitoring the voltage state of the assembled battery within the set target period and determining whether or not discharge for equalization is necessary, and It is preferable to have a means for performing an equalization process when it is determined that it is necessary to perform an electrical discharge.

  By at least one of the above-described configurations, a command to perform equalization processing is issued to the equalization processing unit when temperature variation in the assembled battery exceeds a predetermined range that is arbitrarily determined, and equalization processing is performed when the temperature variation is within the predetermined range. Issue a command not to be performed. The temperature variation in the assembled battery reflects the self-discharge variation of each unit cell constituting the assembled battery. Therefore, when the temperature variation in the assembled battery is small, the variation in the discharge state of each unit cell is small. For example, even if the output voltage of each unit cell varies, it is not necessary to perform the equalization process immediately. According to the above configuration, even when the equalization process is performed normally, since the equalization process is not performed when the temperature variation of the assembled battery is small, the power required for the equalization process can be suppressed.

  Further, since the processing interval for performing the equalization process or the target period for performing the equalization process is set according to the temperature variation of the assembled battery, for example, when the temperature variation is not so large, the processing interval is increased. Alternatively, the target period can be shortened to reduce power consumption in the equalization processing unit.

  Further, in the assembled battery equalization system according to the present invention, the ignition stop is executed after the equalization command means issues a command, so that after the equalization command is issued, the assembled battery power is not consumed. An equalization process can be performed on the battery pack having a constant voltage state. In addition, the electric power required for the subsequent equalization process uses a low-voltage secondary battery for auxiliary equipment as a power source.

  Further, when the equalization processing unit receives an instruction to perform equalization processing, the equalization processing unit initializes and starts a timer for setting a processing interval for performing equalization processing, and initializes the timer every time the processing interval is reached. Each time the means and the timer reach the set processing interval, the voltage state of the assembled battery is monitored to determine whether it is necessary to discharge for equalization. That is, even when the equalization processing command is received, voltage monitoring is performed only when the timer reaches the set processing interval. Therefore, the voltage monitoring is performed intermittently instead of continuously, and thereby the discharge process for equalization can be performed intermittently instead of continuously, so that the power for the equalization process can be suppressed. it can.

  Further, when the equalization processing unit receives an instruction to perform the equalization process, the equalization process unit initializes and starts a timer for setting a target period for performing the equalization process, and the timer elapsed time from the execution of the ignition stop is set. Only during the target period, the voltage state of the assembled battery is monitored to determine whether or not discharge for equalization needs to be performed. In this case, the voltage monitoring and the equalization discharge process based on the result are continuously performed during the setting target period. However, after the setting target period ends, the equalization process is not performed thereafter. As described above, since the setting target period is set according to the temperature variation of the battery, it is possible to prevent unnecessary equalization processing, thereby suppressing power required for the equalization processing.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, it is assumed that the assembled battery to be equalized is configured as a high-voltage battery by combining a plurality of nickel-metal hydride cells or a plurality of lithium-ion cells, but other types of cells are used. An assembled battery in which a plurality of batteries are combined may be used.

  FIG. 1 is a block diagram showing a configuration of an assembled battery equalization system 10 for a vehicle. The assembled battery equalization system 10 for a vehicle has a function of equalizing the charged state or the discharged state of a plurality of single cells constituting the assembled battery housed in the battery pack 12. The assembled battery equalization system 10 for a vehicle includes a plurality of temperature sensors 14 for detecting temperatures related to the battery pack 12 and a plurality of voltages for detecting voltages of the individual cells constituting the assembled battery housed in the battery pack 12. The sensor 16, the equalization circuit 22 that performs equalization discharge of the assembled battery accommodated in the battery pack 12 when necessary, the control block 30 that controls the entire equalization process, the control block 30, and each temperature sensor 14 And a temperature detection I / F 18 that is an interface between the control block and each voltage sensor 16, and a voltage detection I / F 20 that is an interface between the control block and each voltage sensor 16. These elements are connected to each other.

  The battery pack 12 is a unit in which the assembled battery is accommodated as described above. In addition to the assembled battery, the battery pack 12 includes peripheral elements such as a system main relay, a DC / DC converter, a boost converter, an inverter circuit, and the like. Composed. The assembled battery is configured as a high voltage battery by combining a plurality of single cells, and is used as a high voltage power source for a vehicle driving motor. The assembled battery has a function of charging a low-voltage battery for a vehicle using an appropriate DC / DC converter or the like. The electric power of the low-voltage battery for vehicles is used for the operations of the control block 30, the equalization circuit 22, and the like.

  A high voltage battery which is an assembled battery is configured by combining a plurality of single cells such as lithium ion batteries or nickel metal hydride batteries. Since nickel-metal hydride cells have an output voltage of about 1.2V and lithium-ion cells have an output voltage of about 3.6V, for example, in the case of a 200V system high-voltage battery, the former is combined with about 200 cells, and the latter It is configured by combining about 60 single cells.

  The plurality of temperature sensors 14 are for detecting temperatures of different parts related to the assembled battery, and detect temperatures of a plurality of parts of the assembled battery and temperatures around the assembled battery. The detected result is transmitted to the control block 30 via the temperature detection I / F 18. In the control block 30, based on the detection results of these temperature sensors 14, temperature variations in the assembled battery are obtained by the function of the temperature variation determination unit 34 described later. The temperature variation in the assembled battery reflects the self-discharge variation of each unit cell constituting the assembled battery. That is, the plurality of temperature sensors 14 are used to determine the degree of discharge variation among the individual cells.

  Since the equalization process is performed in order to reduce the variation in the charging state or discharging state of each unit cell, it is preferably performed according to SOC (State of Charge) indicating the charging state of each unit cell. Therefore, it is necessary to perform equalization processing based on the temperature variation of the assembled battery separately from the result of the voltage variation based on the voltage detection of each single cell by the plurality of voltage sensors 16 described later or together with the result of the voltage variation. It is preferable to determine sex. The plurality of temperature sensors 14 are provided from that viewpoint.

  The position where the temperature sensor 14 is provided is preferably a portion including both end portions and the center portion of the assembled battery. Each of the cells constituting the assembled battery generates heat due to the battery reaction during discharge, but the cells at both ends of the assembled battery are in contact with the outside air, whereas the cell at the center of the assembled battery is on both sides. Since it is in contact with other unit cells, even if the heat generation state due to discharge is the same, the heat dissipation state is different, so the temperature is often different. Therefore, in order to detect temperature variations in the assembled battery, the temperature sensor 14 is preferably arranged at a portion including both ends and the center of the assembled battery. Further, the temperature variation of the assembled battery is also affected by the temperature of the outside air of the battery pack 12. As the outside air temperature that affects the temperature variation of the assembled battery, the temperature inside the vehicle and the temperature inside the battery pack 12 can be considered in addition to the outside temperature of the vehicle. In particular, when other electronic components that generate heat are accommodated in the battery pack 12, the arrangement of the electronic components is also affected. Therefore, it is preferable that the temperature sensor 14 is disposed at an appropriate portion around the assembled battery including the inside and outside of the battery pack 12, and the number of the portions may be plural.

  The plurality of voltage sensors 16 are sensors that detect the output voltage of each single battery constituting the assembled battery. As described above, the equalization process is performed in order to align the charging state or discharging state of each battery, and the voltage of each single cell is used as an index for aligning the charging state or discharging state. The detection of the plurality of voltage sensors 16 is instructed via the voltage detection I / F 20 by the function of the voltage monitoring module 42 of the control block 30, and the detection results are transmitted to the control block 30.

  The equalization circuit 22 is a circuit that performs a discharge process for equalization on each unit cell constituting the assembled battery. Specifically, it can be composed of a switch for controlling the discharge period, a resistance element as a discharge load, and the like.

  The control block 30 is a computer having a function of controlling the entire equalization process. The control block 30 can also be configured as a single computer, and another computer for the vehicle can also serve as its function. For example, in the case of a hybrid vehicle, the function of the control block 30 may be executed by a hybrid CPU that performs overall control.

  When an ignition-off command is issued to the vehicle, the control block 30 receives the command, performs a series of pre-processing relating to equalization, and then performs ignition-off, and a plurality of temperatures. A temperature variation determination unit 34 that determines temperature variation related to the assembled battery based on the detection result of the sensor 14; an equalization processing command unit 36 that determines whether or not to issue a command to perform equalization processing to the equalization processing unit 38; An equalization processing unit 38 that performs processing related to the equalization circuit 22 is included. The equalization processing unit 38 includes a processing condition setting module 40 that sets processing conditions for performing equalization processing based on temperature variation and the like, a voltage monitoring module 42 that monitors the detection values of the plurality of voltage sensors 16, and The equalization circuit 22 includes an equalization circuit execution module 44 that executes discharge.

  These functions can be realized by software, and specifically by executing a corresponding equalization processing program. Some of these functions may be realized by hardware.

  When the equalization processing unit 38 receives the equalization processing command from the equalization processing command unit 36, it can be processed internally without receiving another command thereafter. It can be.

  The operation of the assembled battery equalization system 10 for a vehicle having the above-described configuration, in particular, each function of the control block 30, will be described below with reference to the flowcharts of FIGS. 2 and 4 and the diagrams showing the state of equalization in FIGS. explain. FIG. 2 and FIG. 4 are flowcharts showing the procedure for equalization processing by two methods for the assembled battery for vehicles, and each procedure corresponds to each processing procedure of the corresponding equalization processing program. If the two methods are distinguished and the method according to the flowchart of FIG. 2 is called the first equalization processing method and the method according to the flowchart of FIG. 4 is called the second equalization processing method, FIG. FIG. 5 shows the time lapse of temperature variation and voltage variation in the assembled battery in the case of the second equalization process. As shown in these drawings, the first equalization processing method and the second equalization processing method have many common parts. Therefore, the first equalization processing method will be described first, and then the second equalization processing method will be described focusing on differences from the first equalization processing method.

FIG. 2 is a flowchart showing a procedure of battery pack equalization by the first equalization processing method. First, when an ignition-off request is received (S10), the ignition-off is not immediately executed by the function of the IG-off processing unit 32, and the process proceeds to S12. In S12, a plurality of temperatures of the battery pack are acquired. Specifically, the function of the battery variation determination unit 34 instructs the plurality of temperature sensors 14 via the temperature detection I / F 18 to detect a plurality of temperatures related to the battery pack 12 and transmit the detection results. receive. And based on a plurality of received detection results, temperature variation in the assembled battery is obtained, and compared with a predetermined criterion,
The temperature variation regarding the assembled battery is determined (S14).

  The determination of the temperature variation relating to the assembled battery is made not only of the temperature variation inside the assembled battery at that time but also the speed of the expansion or convergence of the temperature variation. That is, the temperature variation inside the assembled battery at that time is obtained from the difference in temperature between both ends and the center of the assembled battery. In addition, the temperature variation at that time quickly converges or decreases due to the temperature inside the battery pack 12, the temperature outside the battery pack 12, and the difference between these and the temperature of the assembled battery, etc. It is determined whether the temperature variation does not converge even if it takes a long time, and is likely to be maintained as it is.

  For example, even if the battery pack has been actively charged and discharged up to now, such as immediately after stopping the vehicle operation in a cold region, even if the temperature variation of the battery pack itself is small, the outside air temperature is higher than the temperature of the battery pack itself. When it is considerably low, the end of the assembled battery is rapidly cooled, and it is predicted that the temperature variation of the assembled battery will increase. On the contrary, the battery pack is not charged or discharged so much as when the vehicle is stopped before it is driven too much, the temperature of the battery pack itself is considerably low, and even if the temperature variation is large, the outside air temperature is When the temperature is appropriately higher than the above temperature, it is predicted that the end of the assembled battery is appropriately warmed and the temperature variation of the assembled battery converges. Thus, the future transition of the temperature variation of the assembled battery can be determined in consideration of the temperature inside and outside the assembled battery.

  Based on the temperature variation determination result, it is determined whether or not equalization processing is necessary (S16). This determination is made by comparing the magnitude of temperature variation inside the assembled battery with a predetermined reference range. For example, if the reference range for the temperature difference between the maximum value and the minimum value of a plurality of parts in the assembled battery is 4 ° C., equalization processing is required when the maximum temperature difference in the assembled battery exceeds 4 ° C. It is judged. Of course, other values can be used as the reference range.

  To this determination, it is possible to add a determination of future transition of the maximum temperature difference of the assembled battery. For example, even if the maximum temperature difference inside the assembled battery is 4.1 ° C. and the like, and even if the equalization process is required according to the above criteria, the determination of the future transition of the maximum temperature difference inside the assembled battery is several minutes. If the content converges to a variation of 3 ° C. within, it can be determined that the equalization process is unnecessary. In this way, the criterion for adopting the judgment of future transition of the maximum temperature difference of the assembled battery is, for example, when the maximum temperature difference inside the assembled battery exceeds the reference range, and within the assembled battery within a few minutes The maximum temperature difference can converge within the reference range.

  When it is not determined that the equalization process is necessary, the equalization flag is turned off (S18). When it is determined that the equalization process is necessary, the equalization flag is turned on (S20). Since the equalization flag is issued to the equalization processing unit 38, steps S18 and S20 correspond to equalization processing commands and are executed by the function of the equalization processing command unit 36 of the control block 30.

  When the equalization flag is turned on, a voltage monitoring interval is further set (S22). The voltage monitoring interval determines voltage variation based on detection values of the plurality of voltage sensors 16 in order to perform equalization processing in the equalization processing unit 38, but detects voltage in order to determine the voltage variation. It is a timing interval. In other words, in the equalization processing described below, equalization processing is not performed continuously in time, but is performed discretely in time, and the power required for the equalization processing is suppressed. .

  The voltage monitoring interval reflects the result of temperature variation in S14. For example, when the temperature variation in the assembled battery is large, the voltage monitoring interval is shortened, and the equalization process is frequently executed to equalize the charge state and the discharge state between the single cells in a short period. On the contrary, when the temperature variation in the assembled battery is not so large, the voltage monitoring interval can be lengthened and the power required for the equalization process can be reduced. Thus, the voltage monitoring interval can be set according to the maximum temperature difference inside the assembled battery. The reference for setting is stored in advance in a lookup table, and this can be compared with the maximum temperature difference inside the assembled battery, and the voltage monitoring interval to be set can be read out. Alternatively, a calculation formula may be determined in advance, a maximum temperature difference inside the assembled battery may be input to the calculation formula, and a voltage monitoring interval to be set may be output.

  The judgment result of the future transition of the maximum temperature difference of the assembled battery can be added to the setting standard of the voltage monitoring interval. For example, if the future transition of the maximum temperature difference inside the assembled battery is in the direction of expanding the maximum temperature difference, the voltage monitoring interval is shortened and frequent equalization is performed to increase the maximum temperature difference. Perform equalization in the direction to suppress On the contrary, when the determination of the future transition of the maximum temperature difference in the assembled battery is in a direction to converge the maximum temperature difference, the voltage monitoring interval can be lengthened, and the power required for the equalization process can be reduced.

  When the voltage monitoring interval is set in S22, the content is sent to the equalization processing unit 38 together with the command to turn on the equalization flag. When the equalization flag is turned off in S18, the command is also sent to the equalization processing unit 38. Thus, when the process of S18 or the process of S22 is completed, an ignition-off process is executed by the function of the IG-off processing unit 32 (S24). Thereafter, the power of the assembled battery is not consumed, and the equalization process can be performed on the assembled battery in a stable voltage state. The ignition is not executed immediately after the IG OFF request is acquired. The temperature variation is determined, the necessity of the equalization process is determined, and the voltage monitoring interval is set by a specific equalization process. This is because it is in the previous stage of processing, so that it is handled in the same manner as other processing during operation of the vehicle. Note that, unlike the second equalization processing method described later, none of the steps S12, S14, S16, S18, S20, and S22 is related to the ignition-off processing. The ignition-off may be executed immediately after receiving the IG-off request.

  The steps after S30 are processing steps executed by the equalization processing unit 38. First, the equalization processing unit 38 determines whether or not the command issued from the equalization processing command unit 36 is an equalization flag on (S30). If the command is equalization flag OFF, the process proceeds to S46, where the equalization circuit and the assembled battery that is a high-voltage battery are disconnected, and all the processes related to equalization are terminated. When the command is equalization flag ON, the set time t to be set in the timer provided in advance is set to the voltage monitoring interval determined in S22 (S32). This processing is executed by the function of the processing condition setting module 40 of the equalization processing unit 38.

  Next, the timer is reset (S34), the timer is started from this point, and it is determined whether the elapsed time of the timer has reached the set time t (S36), and the elapsed time of the timer has reached the set time t. If it is determined, voltage monitoring is performed (S38). Specifically, the function of the voltage monitoring module 42 instructs the plurality of voltage sensors 16 to detect the voltage of each single cell via the voltage detection I / F 20, and each detected voltage value is transmitted to the control block 30. The

  Based on the voltage value of each unit cell acquired by voltage monitoring, it is determined whether or not equalization processing discharge is necessary (S40). Specifically, the predetermined voltage variation reference range is compared with the maximum voltage difference between the individual cells, and when the maximum voltage difference exceeds the voltage variation reference range, it is determined that equalization processing discharge is necessary. be able to. For example, the voltage variation reference range can be 10% in width with respect to the nominal output voltage of the unit cell. Of course, other widths can be used as the voltage variation reference range.

  If it is determined that the equalization process discharge is necessary, the equalization circuit is turned on and the equalization process discharge is executed (S42). And it returns to S34 again. That is, the timer is reset again, and voltage monitoring is performed again when the elapsed time of the timer reaches the next voltage monitoring interval. The process returns to S34 after the equalization process discharge is completed, or when the equalization process discharge is started regardless of the completion of the equalization process discharge. In the latter case, the equalization discharge needs to be completed in a time shorter than the voltage monitoring interval.

It is a block diagram which shows the structure of the assembled battery equalization system for vehicles in embodiment which concerns on this invention. In embodiment which concerns on this invention, it is a flowchart which shows the procedure of the assembled battery equalization by the 1st equalization processing method. In embodiment which concerns on this invention, it is a figure explaining the time passage of the temperature variation and voltage variation in an assembled battery in the case of the 1st equalization processing method. In embodiment which concerns on this invention, it is a flowchart which shows the procedure of the assembled battery equalization by the 2nd equalization processing method. In embodiment which concerns on this invention, it is a figure explaining the time passage of the temperature variation and voltage variation in an assembled battery in the case of the 2nd equalization processing method.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Vehicle assembled battery equalization system, 12 Battery pack, 14 Temperature sensor, 16 Voltage sensor, 18 Temperature detection I / F, 20 Voltage detection I / F, 22 Equalization circuit, 30 Control block, 32 IG off process part, 34 temperature variation determination unit, 36 equalization processing command unit, 38 equalization processing unit, 40 processing condition setting module, 42 voltage monitoring module, 44 equalization circuit execution module.

Claims (6)

An equalization processing unit for equalizing the state of charge or discharge of each battery constituting the assembled battery;
A plurality of temperature sensors for detecting temperatures of different parts with respect to the assembled battery;
A control unit for controlling the operation of the equalization processing unit based on the temperature state of the assembled battery;
With
The control unit
Means for obtaining temperature variations in the assembled battery based on detection values of a plurality of temperature sensors;
If the temperature variation in the assembled battery exceeds a predetermined range that is arbitrarily determined, a command to perform equalization processing thereafter is issued to the equalization processing unit, and if it is within the predetermined range, a command not to perform equalization processing is issued. Equalization command means;
An assembled battery equalizing system for a vehicle characterized by comprising: The assembled battery equalization system according to claim 1,
The equalization command means sets a processing interval for performing the equalization process or a target period for performing the equalization process, and issues a command for performing the equalization process. . The assembled battery equalization system according to claim 2,
The equalization command means sets a processing interval for performing equalization processing or a target period for performing equalization processing in accordance with temperature variation of the assembled batteries. The assembled battery equalization system according to claim 2 or 3, further comprising means for receiving an ignition stop request for stopping the operation of the vehicle engine,
The equalization command means receives the ignition stop command, and when the temperature variation in the assembled battery exceeds a predetermined range, issues a command to perform the subsequent equalization processing to the equalization processing unit,
An assembled battery equalizing system for a vehicle, characterized in that an ignition stop is executed after the equalization command means issues a command. In the assembled battery equalization system according to claim 2 or 3,
The equalization processor
Means for initializing and starting a timer for setting a processing interval for performing equalization processing when receiving a command for performing equalization processing, and initializing and repeating the timer each time the processing interval is reached;
Means for monitoring the voltage state of the assembled battery each time the timer reaches the set processing interval, and determining whether or not it is necessary to discharge for equalization;
Means for performing equalization processing when it is determined that discharge for equalization needs to be performed;
An assembled battery equalizing system for a vehicle characterized by comprising: The assembled battery equalization system according to claim 4,
The equalization processor
Means for initializing and starting a timer for setting a target period for performing equalization processing when receiving an instruction to perform equalization processing;
Means for determining whether or not the timer elapsed time from the execution of ignition stop is within the setting target period;
Means for monitoring the voltage state of the assembled battery within the set target period and determining whether or not it is necessary to perform discharge for equalization;
Means for performing equalization processing when it is determined that discharge for equalization needs to be performed;
An assembled battery equalizing system for a vehicle characterized by comprising:

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