JP2018185975A - Battery pack monitoring integrated circuit device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack monitoring integrated circuit device which allows for selection of an optimum configuration according to the number of battery packs to be monitored, while restraining increase in the number of terminals.SOLUTION: A battery monitoring IC4 includes I/O terminals 4b-4e, a multiplexer 8, and a control section 5. The I/O terminals 4b-4e can be used as voltage input terminals for inputting the monitoring object of a battery pack, including at least any one of the terminal voltage of a battery cell 3, the current flowing through the battery pack 2 and the temperature of the battery pack 2, from the outside, and can be used as a control output terminal for controlling an external circuit including a multiplexer 14 for selecting the monitoring object of the battery pack. When using the I/O terminals 4b-4e as voltage input terminals, the multiplexer 8 can input a voltage through the voltage input terminal. When using the I/O terminals 4b-4e as control output terminals, the control section 5 controls the multiplexer 14 through the control output terminal.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an assembled battery monitoring integrated circuit device.

  This type of assembled battery is configured by connecting battery blocks in series so as to supply a DC voltage suitable for a power supply target. This assembled battery monitoring device protects and manages the assembled battery by individually detecting the voltage of each battery block and monitoring temperature, current, and the like (see, for example, Patent Document 1). In the technique of Patent Document 1, a multiplexer (MUX) is prepared inside, the number of input terminals corresponding to a plurality of battery blocks to be measured is prepared, and the voltage between terminals of the battery block is switched and input.

JP, 2006-187295, A

  When the technique described in Patent Document 1 is applied, the number of input terminals must be ensured assuming a system with the largest number of battery blocks to be monitored. In this case, the number of input terminals increases. Conversely, when used in an assembled battery system with a small number of monitoring targets, the input terminal is wasted.

  An object of the present invention is to provide an assembled battery monitoring integrated circuit device that can select an optimum configuration according to the number of monitoring targets of the assembled battery while suppressing an increase in the number of terminals.

  The invention described in claim 1 is directed to an assembled battery monitoring integrated circuit device that monitors an assembled battery configured by combining battery cells. The assembled battery monitoring integrated circuit device includes an input / output terminal, an input unit, and a control unit. The input / output terminals can be used as voltage input terminals for externally inputting voltage to be monitored from the assembled battery including at least one of the terminal voltage of the battery cell, the current flowing in the assembled battery, and the temperature of the assembled battery. At the same time, it can be used as a control output terminal for controlling an external circuit including a selection circuit for selecting a monitoring target of the assembled battery. The input unit inputs a voltage through the voltage input terminal when the terminal is used as a voltage input terminal. In addition, when the terminal is used as a control output terminal, the control unit controls the external circuit through the control output terminal.

  As a result, even if the number of terminals of the integrated circuit device main body is small, it becomes possible to connect and select and output a selection circuit for selecting the monitoring target of the assembled battery as an external circuit. The target can be monitored. Conversely, when the number of monitoring targets is small, a terminal can be used as a voltage input terminal without using a selection circuit as an external circuit. Thereby, the optimal structure can be selected according to the number of monitoring targets of the assembled battery while suppressing the increase in the number of terminals. In addition, an optimum configuration can be selected from the viewpoint of cost and device mounting area.

FIG. 1 is an electrical configuration diagram illustrating an assembled battery monitoring integrated circuit device according to the first embodiment and a usage example thereof. Battery assembly integrated circuit device and electrical configuration diagram showing an example of its use (part 2) Battery assembly integrated circuit device and electrical configuration diagram showing an example of its use (Part 3) FIG. 4 is an electrical configuration diagram illustrating an assembled battery monitoring integrated circuit device according to the second embodiment and a usage example thereof. FIG. 5 is an electrical configuration diagram showing an assembled battery monitoring integrated circuit device according to the third embodiment and a usage example thereof. FIG. 6 is an electrical configuration diagram showing an assembled battery monitoring integrated circuit device according to the fourth embodiment and a usage example thereof (No. 6). FIG. 7 is an electrical configuration diagram showing an assembled battery monitoring integrated circuit device according to the fifth embodiment and an example of its use (Part 7).

  Hereinafter, some embodiments of the assembled battery monitoring integrated circuit device will be described with reference to the drawings. In each embodiment, portions having substantially the same function or similar function are denoted by the same reference symbol or similar symbol, and description of each embodiment is omitted as necessary. Below, it demonstrates focusing on the characteristic part of each embodiment.

(First embodiment)
FIG. 1 shows a functional block diagram of the assembled battery system 1. The assembled battery system 1 is mounted on a hybrid vehicle or an electric vehicle, and supplies power to a power supply target such as an electric motor (none of which is shown) via, for example, an inverter. The assembled battery 2 includes a large number of battery blocks in which a plurality of battery cells 3 such as lithium secondary batteries and nickel hydride secondary batteries are connected in series.

  FIG. 1 illustrates a configuration in which the assembled battery 2 includes a plurality of battery cells 3 as a single battery block from the low potential ground GND to the high potential side. In addition, although simplified and shown in FIG. 1, the assembled battery 2 is comprised by connecting many battery blocks in series and parallel. When the battery cell 3 deteriorates, the internal resistance increases and the terminal open voltage decreases. In order to monitor such a deterioration state of the battery cell 3, a battery monitoring IC 4 is provided as an assembled battery monitoring integrated circuit device.

  The battery monitoring IC 4 monitors at least the voltage between the terminals of each battery cell 3, the current flowing through the battery cell 3 of the assembled battery 2, and the temperature of the battery block of the assembled battery 2 as monitoring targets of the assembled battery 2. The monitoring target of these assembled batteries 2 is not limited to this example. As shown in FIG. 1, the battery monitoring IC 4 can measure the internal resistance and the terminal open voltage of each battery cell 3 by detecting the voltage between the terminals of each battery cell 3.

  The battery monitoring IC 4 includes a control unit 5, an A / D conversion unit 6, a reference voltage generation unit 7, a multiplexer 8 as an internal selection circuit, and a plurality of output control units 9 to 12, and an external circuit ( For example, the reference voltage output terminal 4a, the plurality of input / output terminals 4b to 4e, and the ground terminal 4f are used as external terminals for connection to the assembled battery 2, an external multiplexer 14 described later, and temperature measuring circuits 15a and 15b). Is provided. The control unit 5 controls the plurality of output control units 9 to 12 and the multiplexer 8 and is configured to be able to communicate with an external microcomputer 13.

  The plurality of input / output terminals 4b to 4e are connected to different input terminals of the multiplexer 8, respectively. The multiplexer 8 is configured as an input unit capable of inputting voltage from the outside when the input / output terminals 4b to 4e are used as voltage input terminals. The multiplexer 8 selects an input signal from the input / output terminals 4 b to 4 e based on the control signal of the control unit 5, and outputs this selection signal to the A / D conversion unit 6. The A / D conversion unit 6 performs A / D conversion processing according to the control signal of the control unit 5, and outputs the A / D conversion result to the control unit 5. The control unit 5 executes various control processes according to the A / D conversion process result.

  The plurality of input / output terminals 4b to 4e are connected to the plurality of output control units 9 to 12, respectively. The output control units 9 to 12 are constituted by, for example, three-state buffers capable of inputting / outputting digital signals, and the output terminals thereof are connected to or disconnected from the input / output terminals 4b to 4e according to the control signal supplied from the control unit 5 ( High impedance) controllable.

  When the input / output terminals 4b to 4e are used as control output terminals, the control unit 5 controls the output terminals of the output control units 9 to 12 to be connected to the input / output terminals 4b to 4e. ~ 4e can output digital control signals. Further, when the input / output terminals 4b to 4e are used as voltage input terminals, the control unit 5 disconnects the output terminals of the output control units 9 to 12 into the input / output terminals 4b to 4e, that is, controls the output terminals to high impedance. .

  By using such a battery monitoring IC 4 and connecting various circuits to the outside of the input / output terminals 4b to 4e, the monitoring targets of the various assembled batteries 2 can be monitored in various modes. Hereinafter, various usage examples of the battery monitoring IC 4 will be described with reference to FIGS.

<Usage example shown in FIG. 1>
FIG. 1 also shows one usage example of the battery monitoring IC 4 constituting the assembled battery system 1. In the configuration of FIG. 1, an example in which the input / output terminals 4c to 4e are used as control output terminals and the input / output terminal 4b is used as a voltage input terminal is shown. In the configuration of FIG. 1, a multiplexer 14 is connected to the outside of the input / output terminals 4b to 4e. The multiplexer 14 is configured as, for example, an external selection circuit having 8 inputs and 1 output, and selects one input among 8 inputs in response to inputting, for example, a 3-bit digital control signal through the input / output terminals 4c to 4e. The selection signal is output to one input of the internal multiplexer 8 through one input / output terminal 4b.

  A plurality of (for example, 8) inputs of the multiplexer 14 include, for example, a terminal voltage of one or a plurality of battery cells 3, an output voltage of a current sensor 17 that detects a current flowing through the battery cells 3 in one or a plurality of blocks, 1 or One of the temperature detection voltages of the temperature measurement circuits (corresponding to the monitoring target measuring units) 15a and 15b that measure the temperatures of the plurality of battery blocks is input as the monitoring target of the assembled battery 2.

  More specifically, as shown in FIG. 1, the terminal voltage of the battery cell 3 is input to one or more input terminals of the multiplexer 14. A plurality of temperature measurement circuits 15a and 15b are connected between the output terminal 4a and the ground terminal 4f of the reference voltage generation unit 7. The plurality of temperature measurement circuits 15a and 15b are monitoring target measuring units that measure, for example, the temperatures of a plurality of battery blocks constituting the assembled battery 2 as monitoring targets, respectively, between the output terminal 4a and the ground terminal 4f. The resistor 18a and the thermistor 19a, and the resistor 18b and the thermistor 19b are connected in series. The multiplexer 14 inputs the measurement results of the plurality of temperature measurement circuits 15a and 15b, that is, the voltages at the common connection points of the resistors 18a and 18b and the thermistors 19a and 19b, to one or more other input terminals. .

  Furthermore, a current sensor 17 that detects a current flowing through the battery block or the battery cell 3 of the assembled battery 2 is connected to the assembled battery 2. The current sensor 17 is a monitoring target measuring unit that measures the current flowing through one or a plurality of battery cells 3, battery blocks, etc. as a monitoring target, converts the current to be monitored into a current voltage, and converts the current to a low voltage at an absolute voltage level The voltage sensor is configured to output a voltage within a range (for example, 0 to 5 V), and the output of the current sensor 17 is given to one input terminal of the multiplexer 14.

  In this case, the control unit 5 performs communication processing with the microcomputer 13 and controls the output terminals of the three output control units 10 to 12 to be connected to the input / output terminals 4c to 4e, respectively, in accordance with an instruction from the microcomputer 13. And the output terminal of one output control part 9 is controlled to high impedance. Thus, the three input / output terminals 4c to 4e can be assigned as voltage input terminals, and the other one input / output terminal 4b can be assigned as a control output terminal.

  Then, the control unit 5 outputs a 3-bit digital control signal through the three output control units 10 to 12, so that any one of the monitoring targets of the assembled battery 2 is input to the multiplexer 14. Can be made. Thereby, the battery monitoring IC 4 inputs the voltage to be monitored through the multiplexer 8, and A / D conversion processing is performed on the input voltage by the A / D converter 6. Processing according to the A / D conversion processing result can be executed.

<Usage example shown in FIG. 2>
FIG. 2 shows another example of use. In the configuration of FIG. 2, an example in which all the input / output terminals 4b to 4e are used as voltage input terminals is shown. In the case of the configuration in FIG. 2, although not shown, the input / output terminals 4b to 4e are connected to the monitoring target of the assembled battery 2 (for example, the terminal voltage of one or a plurality of battery cells 3 and one or a plurality of blocks). The output voltage of the current sensor 17 for detecting the current flowing through the battery cell 3 and the temperature detection voltages of the temperature measuring circuits 15a and 15b for measuring the temperature of one or a plurality of battery blocks are directly connected and used.

  In this case, the control unit 5 performs communication processing with the microcomputer 13 and controls the output terminals of all the output control units 9 to 12 to high impedance in accordance with a command from the microcomputer 13. Thereby, all the input / output terminals 4b to 4e can be assigned as voltage input terminals. And the control part 5 can select the monitoring object of the assembled battery 2 by carrying out selection control of the input of the multiplexer 8. FIG. Thereby, the battery monitoring IC 4 performs A / D conversion processing on the selected monitoring target by the A / D converter 6, and the control unit 5 responds to the A / D conversion processing result of the A / D converter 6. Processing can be executed. In the usage example of FIG. 2, the voltage to be monitored can be input into the battery monitoring IC 4 by the number of the input / output terminals 4 b to 4 e without the need to configure the multiplexer 14 (see FIG. 1) outside.

<Usage example shown in FIG. 3>
FIG. 3 shows another example of use. In the configuration of FIG. 3, the input / output terminals 4d to 4e are used as control output terminals, and the input / output terminals 4b to 4c are used as voltage input terminals. In the case of the configuration of FIG. 3, a multiplexer 14a is connected to the outside of the input / output terminals 4b to 4e. The multiplexer 14a is configured, for example, as an external selection circuit having four inputs and one output, and selects one input among the four inputs in response to inputting, for example, a 2-bit digital control signal from the input / output terminals 4d and 4e. This selection signal is configured to be output to one input of the internal multiplexer 8 through one input / output terminal 4c.

  Although not shown, the four inputs of the multiplexer 14a include, for example, a terminal voltage of one or a plurality of battery cells 3, a detection voltage of a current sensor 17 that detects a current flowing through the battery cells 3 in one or a plurality of blocks, and one or more Any one of the temperature detection voltages of the temperature measurement circuits 15a, 15b... For measuring the temperature of the battery block is input as a monitoring target of the assembled battery 2.

  In this case, the control unit 5 performs communication processing with the microcomputer 13 and controls the output terminals of the two output control units 11 and 12 to be connected to the input / output terminals 4d and 4e, respectively, in accordance with a command from the microcomputer 13. The output terminals of the two output controllers 9 and 10 are controlled to high impedance. As a result, the two input / output terminals 4b and 4c can be assigned to the voltage input terminals, and the other two input / output terminals 4d and 4e can be assigned to the control output terminals.

  Then, the control unit 5 outputs a 2-bit digital control signal through the two output control units 11 and 12, so that any one of the monitoring targets of the assembled battery 2 described above is multiplexed with the multiplexer. 8 can be input. Thereby, the battery monitoring IC 4 performs A / D conversion processing on the monitoring target by the A / D converter 6, and the control unit 5 performs processing according to the A / D conversion processing result of the A / D converter 6. Can be executed. As shown in FIGS. 1 to 3, by using the battery monitoring IC 4, various circuits are connected to the outside of the input / output terminals 4 b to 4 e to monitor various assembled batteries 2 in various modes. Can be monitored.

<Conceptual summary of this embodiment>
As described above, according to the present embodiment, the monitoring target of the assembled battery 2 including at least one of the terminal voltage of the battery cell 3, the current flowing through the assembled battery 2, and the temperature of the assembled battery 2 is applied from the outside. Input / output terminals 4b to 4e are provided that can be used as voltage input terminals for input and can be used as control output terminals for controlling the multiplexers 14 and 14a for selecting the monitoring target of the assembled battery 2. Further, when any one of the input / output terminals 4b to 4e is used as a voltage input terminal, the multiplexer 8 that inputs a voltage through the voltage input terminal and any one of the input / output terminals 4b to 4e is used as a control output terminal. A control unit 5 for controlling the multiplexers 14 and 14a through the control output terminal.

  Thereby, the number of input / output terminals of the battery monitoring IC 4 can be reduced as much as possible. Further, when many monitoring targets of the assembled battery 2 are connected, it can be dealt with by providing the multiplexers 14 and 14a outside, and when there are few monitoring targets of the assembled battery 2, they are directly input to the input / output terminals 4b to 4e of the battery monitoring IC 4. Therefore, the battery monitoring IC 4 having high versatility can be provided.

(Second Embodiment)
FIG. 4 shows an additional explanatory diagram of the second embodiment. In the second embodiment, a configuration in which a high voltage detection system circuit and a low voltage detection system circuit are provided by different paths is shown, and a more practical configuration will be described.

  FIG. 4 schematically shows an electrical configuration diagram of the assembled battery system 101. The assembled battery system 101 includes a battery monitoring IC 104 and monitors the monitoring target of the assembled battery 2. The assembled battery 2 includes a battery block in which battery cells 3 are connected in series on the high potential side from the ground node potential 0V to about several tens of stages. Therefore, the assembled battery 2 outputs a potential (for example, about 5 V) lower than a predetermined potential (for example, about 5 V) at an absolute potential level, but also outputs a potential that is relatively higher (about about 100 V) than the predetermined potential. Normally, a high voltage element is used for a circuit that detects a high voltage, but the high voltage element has a larger element area and mounting area than a low voltage element. Therefore, as shown in FIG. 4, it is desirable to configure the high voltage operation system circuit and the low voltage operation system circuit separately.

  The battery monitoring IC 104 includes input terminals 4g to 4j in addition to the input / output terminals 4b to 4e described in the above embodiment, and the terminal voltage of each battery cell 3 of the assembled battery 2 through these input terminals 4g to 4i. Connected to enter directly.

  A multiplexer 122 capable of inputting a high voltage is connected to the input terminals 4g to 4j as an internal selection circuit. The multiplexer 122 inputs the terminal voltages of the battery cells 3 of the assembled battery 2 through the input terminals 4g to 4j. . The multiplexer 122 selects the inter-terminal voltage of each battery cell 3 in accordance with the control signal input from the control unit 5 and outputs the selected voltage to the subsequent level shift circuit 123. The level shift circuit 123 performs a level shift to a voltage in the input possible range (for example, 0 to 5 V) of the A / D converter 106 in the subsequent stage according to the control signal input from the control unit 5, and the voltage after the level shift is The data is input to the A / D converter 106. The A / D converter 106 performs A / D conversion processing according to a control signal from the control unit 5 and outputs an A / D conversion result to the control unit 5.

  The battery monitoring IC 104 of the present embodiment is provided with a multiplexer 122 that can input a high voltage in order to detect the voltage between the terminals of the battery cell 3 as described above, and a level shift circuit 123 that level-shifts the output of the multiplexer 122. Thus, the terminal voltage of the battery cell 3 can be measured.

  In this embodiment, a circuit configuration similar to that in the first embodiment (multiplexer 8 and output control units 9 to 12) is provided for a relatively low voltage operation (for example, up to 5 V). As in the first embodiment, The input / output terminals 4b to 4e can be used as voltage input terminals or control output terminals.

  A multiplexer 14a is connected to the outside of the input / output terminals 4b to 4e. The multiplexer 14a is configured as an external selection circuit for low voltage operation (for example, up to several V) having, for example, 8 inputs and 1 output, and inputs, for example, a 3-bit digital control signal from the input / output terminals 4b to 4e. Accordingly, one of the eight inputs is selected, and this selection signal is output to one input of the internal multiplexer 8 through one input / output terminal 4b.

  The eight inputs of the multiplexer 14a include, for example, output voltages of a current sensor 17 that detects a current flowing in the battery cell 3 in one or a plurality of blocks, and temperature measurement circuits 15a, 15b that measure the temperature of one or a plurality of battery blocks. Any one of the temperature detection voltages 15 c is input as a monitoring target of the assembled battery 2. These monitoring target voltages are in a lower voltage range than a predetermined potential (for example, 10 to 20 V), and these monitoring targets output a relatively low voltage.

  A plurality of temperature measurement circuits 15a, 15b, and 15c are connected between the output terminal 4a and the ground terminal 4f of the reference voltage generator 7. The plurality of temperature measurement circuits 15a, 15b, and 15c are arranged so as to measure, for example, the temperatures of a plurality of battery blocks constituting the assembled battery 2 as monitoring targets, respectively, and a resistance is provided between the output terminal 4a and the ground terminal 4f. 18a, 18b, 18c and thermistors 19a, 19b, 19c are connected in series. The multiplexer 14 is configured to input measurement results of the plurality of temperature measurement circuits 15a and 15b, that is, voltages at the common connection points of the resistors 18a and 18b and the thermistors 19a and 19b.

  Further, a current sensor 17 that detects a current flowing through the battery block or battery cell 3 of the assembled battery 2 is connected to the assembled battery 2 as a monitoring target measuring unit. The current sensor 17 is configured to current-voltage convert the current flowing through the battery cell 3 and the like and output a voltage in the low voltage range (for example, 0 to 5 V) at an absolute potential level. The output of the current sensor 17 is a multiplexer. 14 input terminals.

  When such a connection configuration is used, the control unit 5 controls the output terminals of the three output control units 10 to 12 to be electrically connected to the input / output terminals, respectively, and the output terminal of one output control unit 9 is controlled. Control to high impedance. Then, the control unit 5 outputs a 3-bit digital control signal through the three output control units 10 to 12, so that a plurality of monitoring targets (for example, output voltage of the current sensor 17, measurement voltage of the temperature measurement circuits 15 a to 15 c). ) Can be input to the internal low-voltage multiplexer 8. Thereby, the battery monitoring IC 104 performs A / D conversion processing by the A / D converter 106, and the control unit 5 can execute processing according to the A / D conversion processing result of the A / D converter 106.

  Therefore, the control unit 5 can acquire the information on the voltage between the terminals of the battery cell 3 through the multiplexer 122 capable of inputting a high voltage, and the information on the temperature of the battery block of the assembled battery 2 and the current information on the current sensor 17 can be used for the low voltage. It can be obtained through the multiplexer 8. For this reason, the same effect as the above-mentioned embodiment is obtained.

<Conceptual summary of this embodiment>
In short, according to the present embodiment, as the monitoring target of the assembled battery 2, at least a plurality of monitoring targets are applied among the temperature of the assembled battery 2 and / or the current flowing through the assembled battery 2, and a voltage lower than a predetermined potential is used. A multiplexer 14a for selecting one of a plurality of measurement results of the temperature measurement circuits 15a, 15b, and 15c and the current sensor 17 that operates at a low voltage and measures a plurality of monitoring objects is externally connected through the input / output terminals 4b to 4e. It is configured. Then, the control unit 5 selects and controls the multiplexer 14 a using the input / output terminals 4 c to 4 e as control output terminals, and selects one of the plurality of measurement results and inputs the selected measurement result to the multiplexer 8.

  Also, the input terminal of the terminal voltage capable of inputting any of a plurality of measurement results using the input / output terminals 4b to 4e as voltage input terminals and inputting the terminal voltage of the assembled battery 2 including a high voltage equal to or higher than a predetermined potential. 4g-4j are provided separately. As a result, an optimum configuration can be selected according to the number of monitoring targets of the assembled battery 2 while minimizing an increase in the number of terminals of the monitoring target IC 104, an increase in cost, and an increase in element mounting area. In addition, an optimum configuration can be selected from the viewpoint of cost and device mounting area.

(Third embodiment)
FIG. 5 shows an additional explanatory diagram of the third embodiment. FIG. 5 shows another example of use of the battery monitoring IC 4 described in the first embodiment. As shown in FIG. 5, only the temperature of the assembled battery 2 may be targeted as the monitoring target of the assembled battery 2.

  That is, the plurality of temperature measurement circuits 15 a to 15 c measure the temperatures of the plurality of battery blocks constituting the assembled battery 2 as monitoring targets, but only the plurality of temperature measurement circuits 15 a to 15 c are included in the external multiplexer 14. It is connected. And the control part 5 is comprised so that the measurement voltage of these several temperature measurement circuits 15a-15c may be selected with the external multiplexer 14, and may be input into 1 terminal of the internal multiplexer 8 through one input / output terminal 4b. Has been. Thereby, only the temperature of the assembled battery 2 can be monitored.

(Fourth embodiment)
FIG. 6 shows an additional explanatory diagram of the fourth embodiment. In the fourth embodiment, since the configuration of the third embodiment is a basic configuration, the same parts as those of the third embodiment are denoted by the same reference numerals, and the description thereof is omitted. Hereinafter, the parts different from the third embodiment are mainly described. Explained.

  As shown in FIG. 6, an A / D converter 6 is connected to an AD reference voltage generator 224 that defines a reference voltage of the A / D converter 6, and the A / D converter 6 is connected to the A / D converter 6. An A / D conversion process is performed according to the generated voltage of the reference voltage generating unit 224.

  The reference voltage generation unit 7 is configured inside the battery monitoring IC 204 as described in the first embodiment and the like. However, in the actual configuration inside the battery monitoring IC 204, the output and output of the reference voltage generation unit 7 are included. A wiring resistance 225 exists between the terminal 4a. Therefore, FIG. 6 shows this wiring resistance 225.

  The multiplexer 208 provided in the battery monitoring IC 204 includes five or more selection input terminals. As shown in the first and third embodiments, the input / output terminals 4b to 4e are electrically connected to the four selection input terminals of the multiplexer 208, respectively, but a detection circuit is connected to the other input of the multiplexer 208. (Equivalent to the detection circuit in the main body) 226 is connected.

  The detection circuit 226 is configured inside the main body of the battery monitoring IC 204 (corresponding to the integrated circuit device main body) and, for example, in the vicinity of the reference voltage output terminal 4a, and extends from the reference voltage generator 7 to the reference voltage output terminal 4a. It is provided to detect a voltage drop and a voltage change due to the wiring resistance 225. The detection circuit 226 is configured, for example, by connecting resistors 227 and 228 in series between a node of the reference voltage output terminal 4a inside the battery monitoring IC 204 and a ground node, and a common connection node of these resistors 227 and 228 is connected to the multiplexer 208. Connected to the input terminal.

  Outside the reference voltage output terminal 4a, temperature measurement circuits 15a to 15c are connected as external loads. Normally, if the load currents of the temperature measurement circuits 15a to 15c are close to the standard value, the reference voltage generator 7 can output the standard voltage to the reference voltage output terminal 4a, but, for example, there are many loads on the reference voltage output terminal 4a. When connected, the load currents of the temperature measuring circuits 15a to 15c are larger than the standard value.

  In such a case, for example, when the current driving capability of the reference voltage generation unit 7 is reduced according to some influence, a voltage drop of the reference voltage output terminal 4a occurs. The detection circuit 226 detects a voltage drop at the reference voltage output terminal 4 a and outputs the detection result to the reference voltage error correction unit 229 through the multiplexer 208 and the A / D converter 6.

  The reference voltage error correction unit 229 is configured to correct errors in the measurement results of the temperature measurement circuits 15a to 15c based on the detection result of the detection circuit 226. For example, when the reference voltage becomes lower than the standard value, the reference voltage error correction unit 229 corrects the temperature detection voltage to be inversely proportional to the error. As a result, even if the current drive capability of the reference voltage generation unit 7 is reduced and a voltage drop occurs at the reference voltage output terminal 4a, the reference voltage error correction unit 229 corrects the influence of this error. 5 can obtain a temperature detection result in which the influence of this error is corrected. Since other configurations are the same as those of the above-described embodiment, description thereof is omitted.

  According to the present embodiment, the temperature detection result can be corrected according to the output voltage of the reference voltage detected by the internal detection circuit 226. Further, the number of terminals of the battery monitoring IC 204 can be reduced as compared with the configuration of the fifth embodiment described later.

(Fifth embodiment)
FIG. 7 shows an additional explanatory diagram of the fifth embodiment. In the fifth embodiment, since the configurations of the third and fourth embodiments are the basic configuration, the same parts as those of the third embodiment are denoted by the same reference numerals, and the same or similar parts of the fourth embodiment are the same or similar. The same reference numerals are assigned and description will be omitted as necessary, and the following description will be focused on the differences from the fourth embodiment.

  As shown in the fourth embodiment, in the actual configuration inside the battery monitoring IC 304, the wiring resistance 225 exists between the output of the reference voltage generation unit 7 and the reference voltage output terminal 4a. Also in the actual configuration outside the battery monitoring IC 304, the wiring resistance 329 exists between the reference voltage output terminal 4a and the temperature measurement circuits 15a to 15c. Therefore, FIG. 7 shows these wiring resistors 329.

  As shown in FIG. 7, a detection circuit (equivalent to a detection circuit outside the main body) 326 is provided instead of the detection circuit 226. The detection circuit 326 detects the reference voltage output from the reference voltage output terminal 4a outside the battery monitoring IC 304.

  The detection circuit 326 is configured outside the main body of the battery monitoring IC 304 and installed in the vicinity of the temperature measurement circuits 15a to 15c. From the reference voltage generation unit 7 to the temperature measurement circuits 15a to 15c through the reference voltage output terminal 4a. Are provided for detecting a voltage drop due to the wiring resistances 225 and 329 of the wiring. The detection circuit 326 is configured, for example, by connecting resistors 227 and 228 in series between a node of the reference voltage output terminal 4a and a ground node, and a common connection node of these resistors 227 and 228 is an input terminal of the battery monitoring IC 304. 4k is connected to one input terminal of the multiplexer 208 through 4k. The reference voltage error correction unit 229 corrects errors in the measurement results of the temperature measurement circuits 15a to 15c based on the detection result of the detection circuit 326. Since this detailed description and other configurations are the same as those of the fourth embodiment, description thereof will be omitted.

  Also in this embodiment, the temperature detection result can be corrected according to the output voltage of the reference voltage detected by the detection circuit 326. Moreover, regardless of the influence of the wiring resistance 225 inside the battery monitoring IC 304, even if the voltage drops according to the influence of the wiring resistance 329 outside the battery monitoring IC 304, the influence of this error can be corrected.

(Other embodiments)
The present invention is not limited to the above-described embodiments, can be implemented with various modifications, and can be applied to various embodiments without departing from the gist thereof. For example, the following modifications or expansions are possible.

  In the second embodiment, the input terminals 4g to 4j are provided separately from the input / output terminals 4b to 4e, and the terminal voltage of the battery cell 3 is directly input. However, as the input terminals 4g to 4j, You may provide the function similar to the output combined terminals 4b-4e.

  You may combine the structure and function of several embodiment mentioned above. An aspect in which a part of the above-described embodiment is omitted as long as the problem can be solved can be regarded as the embodiment. Moreover, all the aspects which can be considered in the limit which does not deviate from the essence of the invention specified by the wording described in the claims can be regarded as the embodiment.

  Although the present disclosure has been described based on the above-described embodiments, it is understood that the present disclosure is not limited to the embodiments and structures. The present disclosure includes various modifications and modifications within the equivalent range. In addition, various combinations and forms, as well as other combinations and forms including one element, more or less, are within the scope and spirit of the present disclosure.

  In the drawings, 2 is an assembled battery, 3 is a battery cell, 4, 104 and 204 are battery monitoring ICs (assembled battery monitoring integrated circuit device, integrated circuit device body), 4a is a reference voltage output terminal, and 4b to 4e are also used for input / output. Terminals (voltage input terminal, control output terminal), 4g-4j are terminal voltage input terminals, 5 is a control unit, 8 is a multiplexer (input unit), 9-12 are output control units, and 14 and 14a are multiplexers (external selection) Circuit), 15a to 15c are temperature measurement circuits (monitoring target measurement units), 225 and 329 are wiring resistances, 226 is a detection circuit (internal detection circuit), 326 is a detection circuit (external detection circuit), and 229 is a reference voltage An error correction unit is shown.

Claims (6)

An assembled battery monitoring integrated circuit device (1, 104, 204) for monitoring an assembled battery (2) configured by combining battery cells (3),
The battery cell can be used as a voltage input terminal for externally inputting voltage to be monitored from a battery pack, including at least one of a terminal voltage of the battery cell, a current flowing through the battery pack, and a temperature of the battery pack. I / O terminals (4b to 4e) that can be used as control output terminals for controlling external circuits including external selection circuits (14, 14a) for selecting battery monitoring targets;
An input unit (8) for inputting a voltage through the voltage input terminal when the input / output terminal is used as the voltage input terminal;
A control unit (5) for controlling the external circuit through the control output terminal when the input / output terminal is used as the control output terminal;
An assembled battery monitoring integrated circuit device. A reference voltage output terminal (4a) for outputting a reference voltage to the monitoring target measuring units (15a to 15c) for measuring the monitoring target of the assembled battery;
A reference voltage error correction unit (229) for correcting an error in a measurement result of the monitoring target measurement unit based on a detection result of detecting a reference voltage output from the reference voltage output terminal;
The assembled battery monitoring integrated circuit device according to claim 1, further comprising:   The assembled battery monitoring integrated circuit device according to claim 2, further comprising an in-body detection circuit (226) for detecting a reference voltage output from the reference voltage output terminal inside the integrated circuit device body (204). Outside-of-body detection that is installed in the vicinity of the monitoring target measurement unit outside the integrated circuit device body (304) and detects the reference voltage output from the reference voltage output terminal outside the integrated circuit device body (304) Circuit (326) connected,
The reference voltage error correction unit detects a voltage change according to a wiring resistance (225, 329) connected between the reference voltage output terminal and the monitoring target measurement unit by the detection circuit outside the main body, and detects the monitoring target The assembled battery monitoring integrated circuit device according to claim 2, wherein an error in the measurement result of the measurement unit is corrected. As the monitoring target of the assembled battery, at least a plurality of monitoring targets among the temperature of the assembled battery and / or the current flowing through the assembled battery are applied, the low voltage operation is performed using a voltage lower than a predetermined potential, and the monitoring is performed The selection circuit (14, 14a) that selects any one of a plurality of measurement results of the monitoring target measurement units (15a-15c, 17) that measure the object is externally connected through the input / output terminals (4b-4e). Configured,
The control unit uses the input / output terminal as a control output terminal to select and control the selection circuit to select one of a plurality of measurement results, and the input unit uses the input / output terminal as a voltage input terminal. Configured to input any of a plurality of measurement results,
The assembled battery monitoring integrated circuit according to any one of claims 1 to 4, further comprising a terminal voltage input terminal (4g to 4j) capable of inputting a terminal voltage of the assembled battery including a high voltage equal to or higher than the predetermined potential. apparatus.   The assembled battery monitoring integrated circuit device according to any one of claims 1 to 4, wherein only the temperature of the assembled battery is targeted as the monitoring target of the assembled battery.

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