JP2014192092A - Battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately detect a temperature state of an exhaust gas discharged from a safety valve in a battery module having the safety valve and composed of a plurality of batteries.SOLUTION: A battery module 1 comprises a plurality of batteries having a safety valve, a duct passage 4 for exhausting an exhaust gas discharged from the safety valve to the outside, and an exhaust temperature state determination unit which determines a temperature state of the exhaust gas. The exhaust temperature state determination unit comprises: a detection circuit 20 including a non-return temperature switch element and a plurality of impedance elements connected in series or in parallel to the temperature switch element; an impedance measuring unit connected via a signal line drawn out from both terminals of the detection circuit; and an output unit which distinguishes between abnormality of the signal line and an open or closed state of the temperature switch element on the basis of the measurement results of the impedance measuring unit and outputs the results.

Description

  The present invention relates to a battery module including a plurality of batteries having a safety valve.

  In a battery module composed of a plurality of batteries having a safety valve, it is quickly detected that gas has been discharged from the safety valve and a battery abnormality is judged. Since the exhaust gas is hot, it is possible to determine the abnormality of the battery by detecting the temperature state of the exhaust gas.

  In Patent Document 1, in a battery module in which a plurality of batteries having open portions for discharging the internal gas when the internal pressure of the battery rises is connected in parallel, the exhaust for guiding the gas discharged from the opening to the opening Providing a part is disclosed. Here, a non-return type switch such as a fuse is provided in the vicinity of the opening, and it is determined that the battery module is abnormal when the non-return type switch is open.

  In Patent Document 2, when any one of a plurality of power storage devices connected in parallel is short-circuited inside, a direct connection is made between the plurality of power storage devices so as to prevent a normal power storage device from discharging. A configuration in which the fuse and the resistance element are arranged in parallel with the battery sub-relay is disclosed. The battery sub-relay is closed in a normal state, and is opened when a short circuit of the power storage device is abnormal, whereby the fuse is blown.

International Publication No. 2012/014449 JP 2011-67046 A

  In a battery module including a plurality of batteries having a safety valve, it is desirable to accurately detect the temperature state of exhaust gas discharged from the safety valve.

  A battery module according to the present invention includes a plurality of batteries having safety valves, a duct passage for exhausting exhaust gas discharged from the safety valves of the plurality of batteries to the outside, and an exhaust temperature state determination unit that determines a temperature state of the exhaust gas. The exhaust temperature state determination unit takes a closed state at a normal temperature, takes an open state when the temperature is higher than the normal temperature and is equal to or higher than a predetermined threshold temperature, and once the state is opened, the exhaust temperature state determination unit may return to the normal temperature. A non-returning temperature switch element that maintains an open state and a detection circuit including a plurality of impedance elements connected in series or in parallel with the temperature switch element, and a signal line drawn from both terminals of the detection circuit Output that distinguishes between the abnormal state of the signal line and the open or closed state of the temperature switch element based on the measured value of the impedance measurement unit and the impedance measurement unit And, including the.

  According to the present invention, since the abnormality of the signal line is distinguished from the open state or the closed state of the temperature switch element, the temperature state of the exhaust gas discharged from the safety valve can be accurately detected.

It is a block diagram of the battery module in an example of embodiment which concerns on this invention. It is a figure which shows the duct channel | path in the battery module of FIG. It is a figure which shows the circuit for a detection of FIG. FIG. 2 is a diagram illustrating a detection circuit, a signal line, and an impedance measurement unit in FIG. It is a figure which shows that the circuit for a detection in FIG. 1 can distinguish signal line abnormality and the open state and closed state of a temperature switch element. FIG. 5 is a diagram showing that a signal line abnormality is distinguished from an open state and a closed state of a temperature switch element based on a measurement result of an impedance measurement unit in FIG. 4. It is a figure which shows the other structural example of the circuit for a detection. It is a figure which shows the structural example of the circuit for a detection different from FIG. 3, FIG. It is a figure which shows the structural example of the circuit for a detection different from FIG.3, FIG.7, FIG.8. It is a figure which shows the other structural example of an impedance measurement part. It is a figure which shows distinguishing a signal line abnormality and the open state and closed state of a temperature switch element based on the measurement result of the impedance measurement part in FIG. It is a figure which shows the structural example of the impedance measurement part different from FIG. 4, FIG. It is a figure which shows the modification of the circuit for a detection of a figure. It is a figure which shows the other structural example of the circuit for a detection. It is a figure which shows that the circuit for a detection in FIG. 14 can distinguish signal line abnormality and the open state and closed state of a temperature switch element. It is a figure which shows the other structural example of a battery module.

  Embodiments of the present invention will be described below in detail with reference to the drawings. The materials, dimensions, shapes, and the like described below are illustrative examples, and can be appropriately changed according to the specifications of the battery module. In the following, corresponding elements in all drawings are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a diagram showing a battery module 1. The battery module 1 includes a module main body 2 in which a plurality of batteries having safety valves are arranged and arranged.

  The module body 2 is provided with a duct passage 4 for exhausting the exhaust gas 3 discharged from the safety valves of a plurality of batteries to the outside. The duct passage 4 is provided so as to penetrate the center portion of the module main body 2 along the length direction of the module main body 2. One end of the duct passage 4 is closed, and a discharge port 5 is provided at the other end. A discharge pipe to an external exhaust device (not shown) is connected to the discharge port 5, and exhaust gas 6 from the discharge port 5 is connected. Is discharged to the outside.

  FIG. 2 is a view showing a cross section perpendicular to the length direction of the module body 2. Here, four batteries 7 appearing in a cross section among a plurality of batteries 7 arranged in the length direction are shown. These batteries 7 have a positive electrode terminal 8 and a negative electrode terminal 9 at both ends in the longitudinal direction of the battery 7. The positive electrode plate 10 provided on the positive electrode side and the negative electrode plate 11 provided on the negative electrode side are electrode parts having a current collecting function for connecting a plurality of batteries 7 in parallel to each other.

  The safety valve 12 is a mechanism that releases the exhaust gas from the inside of the battery 7 to the outside when the pressure of the gas generated by the electrochemical reaction performed inside the battery 7 exceeds a predetermined threshold pressure. The safety valve 12 is disposed on the positive electrode side or the negative electrode side of the battery 7, but is provided in the vicinity of the positive electrode terminal 8 of each battery 7 in FIG. 2.

  Correspondingly, in FIG. 2, the four batteries 7 are arranged so that the positive electrode sides face each other across the duct passage 4, and the duct 13 is arranged so as to cover the positive electrode side. A duct passage 4 is formed at the bottom. Thus, when exhaust gas is discharged from the safety valve 12 provided in the vicinity of each positive electrode terminal 8, the exhaust gas 6 is guided to the duct passage 4 and discharged from the discharge port 5 to the outside as described in FIG. .

  Returning to FIG. 1 again, the detection circuit 20 is a circuit that is disposed in the vicinity of the discharge port 5 and detects the temperature state of the exhaust gas 6. The detection circuit 20 includes a fuse that is a non-returnable temperature switching element that blows when the temperature is equal to or higher than a predetermined threshold temperature, and an impedance element that is connected in series or in parallel to the fuse. At least two signal lines are drawn from the detection circuit 20. The signal line extends along the length direction of the module body 2 to the side opposite to the discharge port 5.

  Thus, there are the following two reasons for extending the signal line. The first reason is that some materials discharged from the discharge port 5 have conductivity. In order to prevent this, since the conductive material discharged from the discharge port 5 may adhere to the signal line or the connector of the impedance measuring unit 22 when the signal line is pulled out of the module body 2 from the exhaust duct side. It is. Second, there are cases where an exhaust gas exhaust path and a heat dissipation mechanism are provided on the side of the exhaust port 5, so that the signal lines do not get in the way when these structures are attached.

  The cable 21 is a signal cable for connecting a signal line extended to the opposite side of the module body 2 from the outlet 5 to the impedance measuring unit 22.

  The impedance measurement unit 22 is a circuit that measures the impedance between two signal lines drawn from the detection circuit 20 among the signal lines included in the cable 21. The impedance measuring unit 22 measures the impedance of the detection circuit 20 and the signal line connected thereto.

  Since the signal line extends in the length direction of the module main body 2 and is further extended by the cable 21 to reach the impedance measuring unit 22, the signal line may be short-circuited or disconnected in the meantime. When the detection circuit 20 is composed of only a fuse, the impedance measurement unit 22 cannot distinguish between a blown fuse and a broken signal line. Further, if there is a short circuit between the signal lines, it is not possible to detect a blown fuse. The detection circuit 20 includes an impedance element connected in series or in parallel to the fuse in addition to the fuse that is the temperature switch element, based on the measurement result of the impedance measuring unit 22 and the abnormality of the signal line and the temperature. This is because the switch element can be distinguished from the open state or the closed state.

  The output terminal 23 drawn out from the impedance measuring unit 22 distinguishes between the signal line abnormality and the open state or the closed state of the temperature switch element for output. The output terminal 23 is connected to a battery module control device (not shown). In some cases, the function of the impedance measurement unit 22 may be part of the function of the battery module control device. At that time, the battery module 1 includes the module body 2 and the cable 21.

  3A and 3B are diagrams showing the detection circuit 20, in which FIG. 3A is a structural diagram showing a mounting state of each element, and FIG. 3B is a circuit diagram. As shown in FIG. 3A, the detection circuit 20 is accommodated in the container 30 that is not affected by the exhaust gases 3 and 6, the two terminals 31 and 32 drawn from the container 30, and the container 30. The first impedance element 33 and the second impedance element 34, and the fuse 35 that can directly contact the exhaust gas 3 and 6 outside the container 30.

  As shown in FIG. 3B, in the circuit for detection 20, the fuse 35 and the first impedance element 33 are connected in series, and the second impedance element 34 is connected in parallel to the fuse 35.

  The fuse 35 takes a closed state at a normal temperature, takes an open state when the temperature is higher than the normal temperature and is equal to or higher than a predetermined threshold temperature, and once opened, maintains the open state even when the normal temperature is restored. Type temperature switch element. The threshold temperature can be determined according to the safety specification of the battery module 1. As an example, the threshold temperature can be about 100 ° C. In this case, when the exhaust gas 6 at the discharge port 5 reaches about 100 ° C. or more, the fuse 35 disposed so as to directly contact the exhaust gas 6 is melted and opened.

  The first impedance element 33 is an element having Z1 as an impedance value. The second impedance element 34 is an element having Z2 as an impedance value. When Z1 = R1 and Z2 = R2, resistance elements having resistance values R1 and R2 can be used as the first impedance element 33 and the second impedance element 34, respectively. When an impedance element such as a resistance element is directly exposed to the exhaust gas 6, the impedance value may change depending on the chemical components contained in the exhaust gas 6 or the temperature of the exhaust gas 6. The container 30 is a protective container that protects the first impedance element 33 and the second impedance element 34 from the exhaust gas 6.

  As shown in FIG. 3A, the connection between the fuse 35 and the first impedance element 33 and the connection between the fuse 35 and the second impedance element 34 are set so that the connection length is as short as possible. Is done. The first impedance element 33 and the second impedance element 34 are used to detect disconnection or short circuit of the signal line in the cable 21 or the like, so that the connection length between the elements in the detection circuit 20 is too long. This is because a disconnection and a short circuit in the connection occur, making it difficult to distinguish between a disconnection and a short circuit of the signal line.

  The connection length should be as short as possible, but one guideline is to set the connection length shorter than any of the element length of the fuse 35, the element length of the first impedance element 33, and the element length of the second impedance element 34. Set. In addition to this, it may be set to a predetermined connection length or less. For example, the predetermined connection length can be several mm.

  The connection between the fuse 35 and the first impedance element 33 and the connection between the fuse 35 and the second impedance element 34 use a heat-resistant connection method because the exhaust gas 6 is at a high temperature. As a connection method having heat resistance, a mechanical connection method such as caulking or a connection method such as welding can be used. The solder connection is not used because the connection may open due to the high temperature of the exhaust gas 6. In addition, when it is confirmed that the container 30 has a heat shielding property and the influence of the high temperature of the exhaust gas 6 does not reach the inside of the container 30, solder connection may be used.

  FIG. 4 is a diagram illustrating a configuration of the impedance measuring unit 22. FIG. 4 shows a detection circuit 20 and a cable 21 in addition to the impedance measurement unit 22. The terminals 31 and 32 of the detection circuit 20 are connected to a signal line, and the signal line extends as a cable 21 and is connected to input terminals 41 and 42 of the impedance measuring unit 22. A signal line drawn from the terminal 32 of the detection circuit 20 is connected to the input terminal 41, and a signal line drawn from the terminal 32 of the detection circuit 20 is connected to the input terminal 42.

  In the impedance measuring unit 22, the input terminal 41 is connected to the constant voltage source Vcc via the resistance element R3, and the input terminal 42 is connected to the ground potential which is the reference potential. Then, the voltage V1 of the input terminal 41 is input to one input section of each of the three comparators 43, 44, and 45. One of the three reference voltages divided by the three resistors connected in series between Vcc and the ground potential is input to the other side input section of the three comparators 43, 44, and 45, respectively. The three reference voltages are respectively set to values that can distinguish between a signal line break in the cable 21 and the like, a fuse 35 blown, and a normal operation in which the fuse 35 is not blown, and a signal line short circuit.

  FIG. 5 is a diagram showing how the impedance between the input terminals 41 and 42 of the impedance measuring unit 22 becomes in the above four states.

  In FIG. 5, (a) is a case of signal line disconnection. At this time, the input terminal 41 is in an open state, so that the value of the combined impedance between the input terminals 41 and 42 is infinite. (B) is when the fuse 35 which is a temperature switch element is blown. Since the fuse 35 is in the open state, the value of the combined impedance between the input terminals 41 and 42 is (Z1 + Z2). (C) is when the signal line is not disconnected or short-circuited and the fuse 35 is not blown, that is, when the temperature of the exhaust gas 6 is equal to or lower than the threshold temperature and the battery module 1 is operating normally. At this time, the fuse 35 is in a closed state, and its impedance is smaller than Z2. Therefore, the value of the combined impedance between the input terminals 41 and 42 is Z1. (D) is a case where the signal lines are short-circuited. At this time, the input terminals 41 and 42 are short-circuited, and the combined impedance therebetween is zero.

  FIG. 6 is a diagram showing what value of V1 in the impedance measuring unit 22 is in the above four states. By using the result of FIG. 5, V1 = Vcc in the case of the signal line break in (a), and V1 = {(Z1 + Z2) / (Z1 + Z2 + Z3)} in the case of the fuse 35 in the blowout in (b) In the normal operation of (c), V1 = {Z1 / (Z1 + Z3)} Vcc, and in the case of the signal line short-circuit of (d), V1 = 0.

  As described above, in the detection circuit 20, the fuse 35 and the first impedance element 33 are connected in series, and the second impedance element 34 is connected in parallel to the fuse 35. Can be distinguished by the difference in V1 of the impedance measuring unit 22. Since the difference in V1 of the impedance measuring unit 22 is in three stages between Vcc and 0, it can be distinguished by the three comparators 43, 44, and 45 by appropriately setting the three reference voltages in FIG. it can.

  In FIG. 4, the state distinguishing unit 46 compares the output values of the three comparators 43, 44, and 45, and the states of (a), (b), (c), and (d) described in FIGS. The state is distinguished and output to the output terminal 23.

  In this way, it is possible to distinguish between the abnormality of the signal line and the open state or the closed state of the fuse 35, so that the temperature state of the exhaust gas 6 discharged from the safety valve 12 can be accurately determined regardless of the abnormality of the signal line. Can be detected.

  Note that a general microprocessor with an analog-digital conversion function may be used in place of the measurement by three comparators using three reference voltages. In this case, the difference in V1 is output as a digital value. In this case, the state distinguishing unit 46 distinguishes between the states (a), (b), (c), and (d) described in FIGS. 5 and 6 based on the digital value. , Output to the output terminal 23.

  In the above description, in the detection circuit 20, the fuse 35, the first impedance element 33, and the second impedance element 34 all have lead wires. For this reason, the connection between them is made between the lead wires, and caulking or welding is used. Here, instead of a structure in which lead components having lead wires are individually used and combined and connected, a single integrated substrate on which a fuse, a first impedance element, and a second impedance element are mounted is used for detection. It can be a circuit. FIGS. 7 to 9 are diagrams showing an example of a detection circuit using a single integrated substrate 50. FIG.

  FIG. 7A is a plan view showing one integrated substrate 50. The integrated substrate 50 is provided with a through rectangular hole 52 for disposing the fuse 35 in a circuit substrate 51 having a wiring pattern (not shown), and a first impedance element 53, which is a chip component, and a second impedance are provided on one surface thereof. The element 54 is mounted. As the circuit board 51, a heat-resistant board can be used. For example, it is possible to use a glass epoxy substrate in which a through rectangular hole 52 is formed and a predetermined wiring pattern is formed. The first impedance element 54 and the second impedance element 54 can be mounted at predetermined positions on the wiring pattern of the circuit board 51 using high temperature solder.

  FIGS. 7B and 7C are diagrams showing a procedure for forming a detection circuit using the integrated substrate 50. FIG. 7B is an exploded view showing each element, and shows that a lower lid member 55 and an upper lid member 56 are used in addition to the integrated substrate 50. The lower lid member 55 is provided with a through hole portion 57 in which the fuse 35 is accommodated, and the upper lid member 56 is also provided with a through hole portion 58 in which the fuse 35 is accommodated.

  FIG. 7C is a diagram showing a detection circuit 59 formed by assembling the elements shown in FIG. Here, in the integrated substrate 50, portions where the first impedance element 53 and the second impedance element 54 are mounted are covered and protected by the lower lid member 55 and the upper lid member 56. On the other hand, the fuse 35 remains exposed by the through rectangular hole 52 of the circuit board 51, the through hole portion 57 of the lower lid member 55, and the through hole portion 58 of the upper lid member 56. In this way, the detection circuit 59 can be made smaller than the detection circuit 20 described in FIG. Since the connection between the fuse 35 and the first impedance element 53 and the connection between the fuse 35 and the second impedance element 54 are performed by the wiring pattern of the circuit board 51, their connection length is shown in FIG. It can be shorter than the detection circuit 20 described in the above.

  FIG. 8 is a diagram showing a detection circuit 60 having another structure using the integrated substrate 50. FIG. 8A is a plan view and FIG. 8B is a side view. The detection circuit 60 covers only a portion of the integrated substrate 50 where the first impedance element 53 and the second impedance element 54 are mounted with a case 61. The case 61 includes a lower case 62 and an upper case 63, and mounting portions of the first impedance element 53 and the second impedance element 54 are housed and protected in an internal space formed by combining them. A portion of the circuit board 51 where the fuse 35 is disposed is exposed to the outside of the case 61. Since the fuse 35 is disposed at the through rectangular hole 52 of the circuit board 51, it can contact the exhaust gas 6.

  FIG. 9 shows a detection circuit in which the first impedance element 53 and the second impedance element 54 on the circuit board 51 are not housed and protected in a sealed space such as a case, but are protected by potting with a heat-resistant resin or the like. FIG. As the resin, an epoxy resin or a silicon resin can be used. As described above, the detection circuit 64 can be made small with a simple structure while protecting the first impedance element 53 and the second impedance element 54.

  In the above description, as the impedance measuring unit 22, the input terminal 41 is connected to the constant voltage source Vcc via the resistance element R3, and the input terminal 42 is connected to the ground potential which is the reference potential. Instead of the constant voltage source, impedance measurement can be performed using a constant current source. In the impedance measuring unit 70 shown in FIG. 10, a constant current source is connected to the input terminal 41, and the input terminal 42 is connected to a ground potential that is a reference potential. The voltage V1 of the input terminal 41 at this time is as shown in FIG. 11 with reference to the result of FIG.

That is, assuming that the constant current value supplied from the constant current source = I ₀ , V1 = Vcc in the case of the signal line disconnection of (a), and V1 = ( Z1 + Z2) × I ₀ , V1 = Z1 × I _{0 in} the normal operation of (c), and V1 = 0 in the case of the signal line short circuit in (d).

  As described above, the impedance measuring unit 70 using the constant current source can also distinguish the abnormality of the signal line from the open state and the closed state of the fuse 35 by the difference in V1. Since the difference in V1 of the impedance measuring unit 70 is in three stages between Vcc and 0, the three comparators 43, 44, and 45 are set by appropriately setting the three reference voltages as described in FIG. Can be distinguished.

  FIG. 12 is a diagram showing an impedance measuring unit 71 using an AC signal. Here, a predetermined AC signal 72 is applied to the input terminal 41 via a predetermined detection impedance Z3. The input terminal 42 is connected to a ground potential that is a reference potential. In this way, according to the impedance between the input terminals 41 and 42, the amplitude of the signal waveform 73 at both ends of the detection impedance Z3 changes from the applied AC signal 72, and the phase difference also changes. Therefore, based on the amplitude difference or phase difference between the signal waveform 73 and the applied AC signal 72, it is possible to distinguish between the abnormality of the signal line and the open state and the closed state of the fuse 35.

  In the above description, the first impedance element 33 and the second impedance element 34 are linearly arranged as the arrangement structure of the detection circuit 20. FIG. 13 is a diagram showing a modification of the detection circuit 20 of FIG. In the detection circuit 74 of FIG. 13, the first impedance element 33 and the second impedance element 34 are not arranged linearly but are folded. In this case, it is preferable to provide a partition plate 36 to prevent a short circuit between the first impedance element 33 and the second impedance element 34. By using the folding arrangement, the dimension in the length direction can be shortened.

  In the above description, as the circuit configuration of the detection circuit 20, the fuse 35 and the first impedance element 33 are connected in series, and the second impedance element 34 is connected in parallel to the fuse 35. Instead of this, the fuse 35 and the first impedance element 33 are connected in series, and the second impedance element 34 is connected in parallel to the connection body in which the first impedance element 33 is connected in series to the fuse 35. it can.

  A detection circuit 80 shown in FIG. 14 has a configuration in which a fuse 35 and a first impedance element 33 are connected in series, and a second impedance element 34 is connected in parallel to the connection body. FIG. 14A is a structural diagram corresponding to FIG. 3A, and FIG. 14B is a circuit diagram corresponding to FIG. 3B.

  FIG. 15 is a diagram corresponding to FIG. 5 and shows how the impedance between the input terminals 41 and 42 of the impedance measuring unit 22 becomes when the detection circuit 80 of FIG. 14 is used. .

  In FIG. 15, (a) is a case of signal line disconnection. At this time, since the input terminal 41 is in an open state, the value of the combined impedance between the input terminals 41 and 42 becomes infinite. (B) is when the fuse 35 which is a temperature switch element is blown. Since the fuse 35 is in an open state, the value of the combined impedance between the input terminals 41 and 42 is Z2. (C) is when the battery module 1 is operating normally when the signal line is not disconnected or short-circuited and the fuse 35 is not blown. At this time, the fuse 35 is in a closed state, and its impedance is smaller than Z2. Therefore, the value of the combined impedance between the input terminals 41 and 42 is {(Z1 × Z2) / (Z1 + Z2)}. (D) is a case where the signal lines are short-circuited. At this time, the input terminals 41 and 42 are short-circuited, and the combined impedance therebetween is zero.

  As described above, even if the detection circuit 80 is used, it is possible to distinguish the abnormality of the signal line from the open state and the closed state of the fuse 35. When this distinction is measured by impedance, the impedance measuring unit 22 in FIG. 4, the impedance measuring unit 70 in FIG. 10, and the impedance measuring unit 71 in FIG. 12 can be used.

  In FIG. 1, the battery module 1 has a plurality of batteries 7 arranged two-dimensionally. FIG. 15 is a diagram showing a battery module 90 in which a plurality of batteries are three-dimensionally arranged. The battery module 90 has a partially stacked structure. Thereby, not only when the space where the battery module 90 can be installed is expanded two-dimensionally, but also when the space where the battery module 90 has a three-dimensional expansion with a change in the height direction can be used to the maximum extent possible. And can.

  In FIG. 16, the battery module 90 has three battery blocks 91, 92, and 93 connected to each other. The duct is provided in common to the three battery blocks 91, 92, 93, and the discharge port 5 is provided in one of the three battery blocks 91, 92, 93. In the case of FIG. 16, it is provided at the end of the battery block 91. The flow of the exhaust gas 94 is indicated by white arrows. Both terminals of the detection circuit 20 are wired inside the battery block 91 with appropriate signal lines, and are connected to a printed wiring of a terminal board 95 formed of, for example, a printed wiring board. The printed wiring is connected to a connector 96 provided on one end side of the terminal board 95, and is connected from the connector 96 to a control circuit 97 shown as ECU via the cable 21. The control circuit 97 has the function of the impedance measuring unit described with reference to FIGS. 4, 10, and 12.

  In the structure of FIG. 16, since the signal line is wired from the detection circuit 20 to the inside of the battery block 91 and connected to the terminal plate 95, the length of the signal line is shorter than that of FIG. In this structure, even if the signal line inside the battery block 91 and the cable 21 are disconnected or short-circuited, the temperature of the exhaust gas 94 can be accurately detected.

  In FIG. 4, the terminal 32 on the fuse 35 side is connected to the input terminal 42, the input terminal 42 is connected to the ground potential which is the reference potential, and the resistance element R3 is connected to the constant voltage source Vcc. . Instead, the input terminal 42 may be connected to the ground potential via the resistance element R3, and the input terminal 42 may be connected to the constant voltage source Vcc as it is. Similar changes can be made in FIGS. 10 and 12.

1,90 battery module, 2 module main body, 3, 6, 94 exhaust gas, 4 duct passage, 5 outlet, 7 battery, 8 positive terminal, 9 negative terminal, 10 positive plate, 11 negative plate, 12 safety valve, 13 duct, 20, 59, 60, 64, 74, 80 Detection circuit, 21 Cable, 22, 70, 71 Impedance measurement unit, 23 Output terminal, 30 Container, 31, 32 terminal, 33, 53 First impedance element, 34, 54 Second impedance element, 35 fuse (temperature switch element), 36 partition plate, 41, 42 input terminal, 43, 44, 45 comparator, 46 state distinguishing part, 50 integrated substrate, 51 circuit board, 52 through rectangular hole, 55 Lower lid member, 56 Upper lid member, 57, 58 Through hole, 61 case, 62 Lower case, 63 Upper case, 72 AC signal, 73 Signal wave , 91, 92 and 93 cell blocks, 95 terminal plate, 96 connector, 97 control circuit (ECU).

Claims (8)

A plurality of batteries having safety valves;
A duct passage for exhausting exhaust gas discharged from the safety valve of the plurality of batteries to the outside;
An exhaust gas temperature state determination unit for determining the temperature state of the exhaust gas;
With
The exhaust temperature state determination unit
Non-recovery that takes a closed state at normal temperature, takes an open state when the temperature is higher than the normal temperature and is equal to or higher than a predetermined threshold temperature, and maintains the open state even when the normal temperature is returned once the open state is reached And a detection circuit including a plurality of impedance elements connected in series or in parallel with the temperature switch element,
An impedance measurement unit connected via signal lines drawn from both terminals of the detection circuit;
Based on the measurement value of the impedance measuring unit, an output unit that distinguishes and outputs the abnormality of the signal line and the open state or the closed state of the temperature switch element
Including battery module. The battery module according to claim 1,
The detection circuit includes:
The temperature switch element;
A first impedance element connected in series to the temperature switch element;
A second impedance element connected in parallel to the temperature switch element or connected in parallel to the connection body for a connection body in which the first impedance element is connected in series to the temperature switch element;
A battery module. The battery module according to claim 2,
The detection circuit is configured so that a connection length between the temperature switch element, the first impedance element, and the second impedance element is equal to or less than a predetermined length, and is disposed at an outlet of the duct passage. Battery module. The battery module according to claim 2 or 3,
The detection circuit includes:
The temperature switch element is in direct contact with the exhaust gas;
The battery module, wherein the first impedance element and the second impedance element are protected by a protective member so as not to be directly exposed to the exhaust gas. The battery module according to claim 3 or 4,
The detection circuit is a battery module in which the temperature switch element, the first impedance element, and the second impedance element are mounted on a single circuit board. The battery module according to claim 1,
The impedance measuring unit is
One of the signal lines drawn from the detection circuit is connected to a reference potential;
A battery module that measures the impedance based on a voltage across the resistance element when a resistance element is connected between the other end of the signal line and a constant voltage source. The battery module according to claim 1,
The impedance measuring unit is
One of the signal lines drawn from the detection circuit is connected to a reference potential;
A battery module that measures the impedance based on a voltage of the signal line when a constant current source is connected to the other of the signal lines. The battery module according to claim 1,
The impedance measuring unit is
One of the signal lines drawn from the detection circuit is connected to a reference potential;
A predetermined AC signal is applied to the other of the signal lines via a predetermined detection impedance, and the impedance is based on an amplitude difference or a phase difference between signal waveforms at both ends of the detection impedance and the applied AC signal. Measure the battery module.

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