JP6742884B2 - Power supply - Google Patents

Description

The present invention relates to a power supply device including a temperature sensor that detects the temperature of gas discharged from a secondary battery.

A power supply device including a secondary battery is provided with an exhaust valve on the outer can in order to prevent the outer can of the battery from bursting. The exhaust valve opens when the internal pressure of the outer can becomes higher than the threshold pressure, and prevents the outer can from bursting due to an increase in the inner pressure. Since the temperature of the gas discharged from the opened exhaust valve is extremely high, the gas is discharged to the outside through the discharge duct to ensure safety. Power supplies of this structure have been developed. (See Patent Document 1)

In these conventional power supply devices, an exhaust duct is connected to an exhaust valve of a battery to discharge hot gas to the outside. FIG. 10 shows the temperature change of the high temperature gas discharged from the exhaust valve of the cylindrical lithium ion secondary battery. As shown in this figure, the maximum temperature of the gas discharged from the exhaust valve is 700° C. or higher, which is extremely high.

On the other hand, when the secondary battery is in an abnormal state and gas is discharged from the exhaust valve, the discharged gas is discharged to the outside through the exhaust duct. Therefore, by detecting the temperature in the exhaust duct, the operating state of the exhaust valve can be determined and the abnormal state of the secondary battery can be detected. However, when the exhaust valves of a plurality of secondary batteries are connected to a common exhaust duct as in the power supply device of Patent Document 1, the length of the gas flow path until the gas discharged from the exhaust valves reaches the temperature sensor However, each battery cell has a different configuration. In the case of such a configuration, since the length of the gas flow path between each secondary battery and the temperature sensor is different, there is a drawback in that the detected temperature of the gas discharged from the exhaust valve changes depending on the battery. Specifically, in the gas discharged from the secondary battery having a long gas flow path, the temperature detected by the temperature sensor is low. On the other hand, when exhausting the gas to the outside, it is necessary to design the exhaust duct so that the temperature of the gas is sufficiently lowered while flowing in the exhaust duct. In such a case, the difference between the temperature detected by the temperature sensor in a normal state and the temperature detected by the temperature sensor when the secondary battery having a long gas flow path is in an abnormal state is small, and the temperature sensor detects It may not be possible to detect an abnormal state of the secondary battery having a long gas flow path based on the temperature.

JP, 2011-65906, A

The present invention was developed mainly for overcoming the above drawbacks of conventional power supply devices. An important object of the present invention is to provide a power supply device capable of accurately detecting an abnormal state of a secondary battery based on the temperature of gas discharged from each secondary battery having different gas flow path lengths.

Means and effects for solving the problems

The power supply device includes a plurality of secondary batteries each having an exhaust valve that opens when a pressure becomes higher than a threshold pressure to exhaust gas, a temperature sensor that detects a gas temperature exhausted from the exhaust valve of the secondary battery, and a temperature sensor. And a discharge duct connected to the secondary battery. The exhaust duct comprises a buffer chamber through which the exhaust gas from the exhaust valve passes. The buffer chamber is a resistance part that identifies the gas flow resistance at the shortest distance of the gas inlet from the exhaust gas, the gas outlet from the inlet, and the gas passage from the exhaust valve of the secondary battery to the temperature sensor. Equipped with. The resistance portion increases the gas flow resistance as the shortest distance of the gas flow path between the secondary battery and the temperature sensor becomes shorter.

The above power supply device is characterized in that the abnormal state of the secondary battery can be accurately detected based on the temperature of the gas discharged from the secondary battery having different gas flow passage lengths. This is because the above power supply device provides a buffer chamber in the exhaust duct and specifies the gas flow resistance discharged from the secondary battery in this buffer chamber by the shortest distance of the gas flow path between the secondary battery and the temperature sensor. This is because the resistance part has a structure that increases the gas flow resistance as the shortest distance of the gas flow path between the secondary battery and the temperature sensor becomes shorter.

A conventional power supply device that detects the temperature of the gas exhausted from the exhaust valves of multiple secondary batteries with one temperature sensor has a high temperature of the exhaust gas from the secondary battery near the temperature sensor, Since the temperature of the exhaust gas from the battery is detected low, the temperature of the gas discharged from the secondary batteries having different gas flow path lengths cannot be accurately detected. Exhaust gas discharged from a nearby secondary battery reaches the temperature sensor without lowering the temperature, but exhaust gas discharged from a distant secondary battery cools down in the discharge duct and reaches the temperature sensor. Because it does.

As described above, in the power supply device according to an aspect of the present invention, the exhaust duct is provided with the buffer chamber including the resistance unit that controls the flow resistance by the path length, and the detection error due to the flow path length between the secondary battery and the temperature sensor is eliminated. It can be resolved. The resistance part has a structure in which the flow resistance of gas decreases as the shortest path length between the secondary battery and the temperature sensor increases. Therefore, the exhaust gas from the secondary battery near the temperature sensor reaches the temperature sensor after passing through the resistance portion having a large flow resistance. On the other hand, the exhaust gas from the secondary battery, which is separated from the temperature sensor, smoothly passes through the resistance portion having a small flow resistance and reaches the temperature sensor. As a result, it is possible to reduce the difference in temperature decrease due to the difference in the path length until reaching the temperature sensor, and it is possible to narrow the temperature distribution of the gas detected by the temperature sensor. Therefore, the abnormal state of the secondary battery can be accurately detected based on the temperature detected by the temperature sensor.

In the power supply device of the present invention, the inlet of the buffer chamber is directly or indirectly connected to the exhaust valve of each secondary battery, and the resistance portion is a throttle opening provided at the inlet, and the throttle opening is up to the temperature sensor. The opening area of the inlet provided between the secondary battery with the shortest distance to the temperature sensor is smaller than the opening area of the inlet provided with the secondary battery with the shortest distance to the temperature sensor. You can

In the above power supply device, the resistance portion provided in the buffer chamber is a throttle opening provided at each inflow port provided in the buffer chamber, and the flow resistance is controlled by the opening area of the throttle opening. The throttle opening reduces the opening area of the inlet where the shortest distance from the temperature sensor to the secondary battery is small.The flow resistance is large, and the opening area of the inlet where the shortest distance to the secondary battery is long is large. By reducing the flow resistance, the temperature of the gas discharged from the secondary batteries having different gas flow path lengths is accurately detected by the temperature sensor. The exhaust gas flowing from the secondary battery near the temperature sensor to the temperature sensor passes through the throttle opening with a small opening area, so the flow velocity of the gas passing through the inlet becomes fast and the air in the buffer chamber is sufficiently filled. The mixture is stirred, and the ambient temperature air and gas in the chamber are sufficiently mixed and reach the temperature sensor. Since the air in the buffer chamber is considerably lower than the temperature of the exhaust gas, the exhaust gas is agitated with the air in the chamber to lower the temperature and reach the temperature sensor, and the detected temperature is lowered.

On the contrary, the exhaust gas from the secondary battery far away from the temperature sensor reaches the temperature sensor through the inlet of the throttle opening with a large opening area, so it passes through the inlet without high-speed flow and is buffered. The temperature is less likely to drop due to mixing with the air in the chamber, and is discharged from the discharge port. Exhaust gas from the secondary battery close to the temperature sensor flows at high speed through the inlet with a small opening area and is sufficiently mixed with the air in the buffer chamber to lower the temperature. The exhaust gas passes through the inflow port without flowing at high speed, the amount of air mixed in the buffer chamber is reduced, and the temperature drop due to the mixed air is reduced. Even in this case, the abnormal state of the secondary battery can be accurately detected based on the temperature detected by the temperature sensor.

In the power supply device of the present invention, the inlet of the buffer chamber is directly or indirectly connected to the exhaust valve of each secondary battery, and the resistance portion is a filter medium that limits the gas flow resistance of the inlet, and is close to the temperature sensor. The gas flow resistance of the filter medium provided at the inlet to the secondary battery can be made larger than the gas flow resistance at the inlet to the secondary battery far from the temperature sensor.

In the above power supply device, since the filter medium for controlling the gas flow resistance is provided in the buffer chamber as a resistance portion, even if the secondary batteries have different path lengths of the gas flow paths, the secondary battery is detected based on the temperature detected by the temperature sensor. It has a feature that can accurately detect the abnormal state of the secondary battery. This is because the gas flow resistance of the filter medium provided at the inlet between the secondary battery near the temperature sensor and the secondary battery is larger than the gas flow resistance at the inlet between the secondary battery far from the temperature sensor. Is. Exhaust gas flowing from the secondary battery near the temperature sensor to the temperature sensor passes through the filter medium having a large gas flow resistance, and is diffused through the filter medium. It is mixed and reaches the temperature sensor. Since the air in the buffer chamber is considerably lower than the temperature of the exhaust gas, the exhaust gas is mixed with the air in the chamber to lower the temperature and reach the temperature sensor, which lowers the detected temperature.

On the contrary, the exhaust gas from the secondary battery far away from the temperature sensor reaches the temperature sensor by passing through the filter medium having a small gas flow resistance. It is prevented from becoming low.

The exhaust gas from the secondary battery close to the temperature sensor is mixed with the air in the chamber by the filter medium and the temperature drops, and the exhaust gas from the secondary battery away from the temperature sensor passes through the filter medium and smoothly flows into the temperature sensor. Therefore, even in the case of secondary batteries having different gas flow path lengths, the abnormal state of the secondary battery can be detected more accurately based on the temperature detected by the temperature sensor.

In the power supply device of the present invention, the inflow port of the buffer chamber is directly or indirectly connected to the exhaust valve of each secondary battery, and the resistance part is provided in the passage of gas flowing into the buffer chamber from the inflow port. Gas flow by a baffle plate that is placed between the inlet and outlet that is connected to a secondary battery that has a shortest distance to the temperature sensor, and that is a baffle plate that is placed in a posture that intersects the gas flow direction. The resistance can be made larger than the gas flow resistance of the baffle plate provided between the inlet and the outlet connected to the secondary battery having the shortest distance from the temperature sensor.

In the above power supply device, since the baffle plate for controlling the gas flow resistance is provided in the buffer chamber as the resistance portion, even if the secondary batteries have different gas flow path lengths, the temperature sensor detects the temperature based on the temperature detected by the temperature sensor. It has a feature that can accurately detect the abnormal state of the secondary battery. In the conventional device, the exhaust gas from the secondary battery, which is close to the temperature sensor where a high temperature is detected and a detection error occurs, has a large flow resistance of the gas provided between the inlet and the outlet. Since the temperature sensor detects by passing it through the baffle plate, it does not reach the temperature sensor straight by passing through the baffle plate, but it is sufficiently diffused by the baffle plate with a large gas flow resistance, and the air in the buffer chamber Is mixed well with and reaches the temperature sensor. Since the air in the buffer chamber is lower than the temperature of the exhaust gas, the exhaust gas is mixed with the air in the chamber by the baffle plate with high gas flow resistance, and the temperature drops and reaches the temperature sensor for detection. The temperature is reduced.

On the contrary, the exhaust gas from the secondary battery far away from the temperature sensor passes smoothly through the baffle plate that reduces the gas flow resistance, reaches the temperature sensor, and the baffle plate mixes less with the air. The lowering of the temperature is prevented.

Therefore, the exhaust gas from the secondary battery close to the temperature sensor is mixed with the air in the chamber by the baffle to lower the temperature and the temperature is detected by the temperature sensor, and the exhaust gas from the secondary battery far from the temperature sensor is detected. Passes through the baffle plate and reaches the temperature sensor smoothly, so that the temperature drop due to the baffle plate is reduced. Therefore, even in secondary batteries having different gas flow path lengths, the abnormal state of the secondary battery can be accurately detected based on the temperature detected by the temperature sensor.

In the power supply device of the present invention, the inlet of the buffer chamber is directly or indirectly connected to the exhaust valve of each secondary battery, and the resistor is provided in the flow path of the gas flowing from the inlet to the buffer chamber. As a baffle plate, the gas flow resistance is specified by the distance between the inlet and the baffle plate with this baffle plate, and the baffle plate with a large gas flow resistance should be closer to the inflow port than the baffle plate with a small gas flow resistance. You can

The above power supply device specifies the gas flow resistance at the interval at which the baffle plate approaches the inflow port, increases the gas flow resistance by approaching the baffle plate to the inflow port, and reduces the gas flow resistance by moving away from the inflow port. Therefore, the position where the baffle is placed is specified by the shortest distance between the secondary battery and the temperature sensor, and even if the secondary battery has a different gas flow path length, the secondary battery is detected based on the temperature detected by the temperature sensor. It has a feature that can accurately detect the abnormal state of the secondary battery.

In the power supply device of the present invention, the inlet of the buffer chamber is directly or indirectly connected to the exhaust valve of each secondary battery, and the resistor is provided in the flow path of the gas flowing from the inlet to the buffer chamber. A baffle plate is used, and the gas flow resistance is specified by the area of the baffle plate, and the baffle plate having a large gas flow resistance can have a larger area than the baffle plate having a small gas flow resistance.

In the above power supply device, the gas flow resistance is specified by the area of the baffle plate, and the baffle plate is increased to increase the gas flow resistance and reduced to reduce the gas flow resistance. By specifying the shortest distance between the temperature sensor and the temperature sensor, it is possible to accurately detect the abnormal state of the secondary battery based on the temperature detected by the temperature sensor, even if the battery has different gas flow path lengths. is there.

In the power supply device of the present invention, the inlet of the buffer chamber is directly or indirectly connected to the exhaust valve of each secondary battery, and the resistor is provided in the flow path of the gas flowing from the inlet to the buffer chamber. The baffle plate is a gas flow resistance that is specified by the angle of the baffle plate with respect to the gas flow direction. The posture can be orthogonal to the direction.

The above power supply device identifies the gas flow resistance by the angle of the baffle plate with respect to the gas flow direction, and sets the baffle plate as a posture orthogonal to the gas flow direction to increase the gas flow resistance and as a posture parallel to the gas flow direction. Since the gas flow resistance is reduced, the posture of disposing the baffle plate can be specified by the shortest distance between the secondary battery and the temperature sensor, and even if the secondary battery has different gas flow path lengths, There is a feature that the abnormal state of the secondary battery can be accurately detected based on the detected temperature of.

In the power supply device of the present invention, the resistance part of the buffer chamber is a wall body that changes the flow path length from the inflow port to the exhaust port, and the wall body provided in the inflow path near the temperature sensor is used as the temperature sensor. It can be arranged at a position where the flow path is made longer than the wall body provided in the flow path of the inlet far away.

The above power supply device is specified by the wall that changes the flow path length of the resistance part, and the gas flow resistance is increased by setting the baffle plate in a posture orthogonal to the gas flow direction, and the gas flow is set in a posture parallel to the gas flow direction. Since the resistance is small, the orientation of arranging the baffle can be specified by the shortest distance between the secondary battery and the temperature sensor, and even if the secondary battery has a different gas flow path length, the temperature sensor can detect it. There is a feature that the abnormal state of the secondary battery can be accurately detected based on the temperature.

In the above power supply device, the temperature sensor can be a thermal fuse.

Embodiments of the present invention will be described below with reference to the drawings. However, the embodiments described below exemplify the power supply device for embodying the technical idea of the present invention, and the present invention does not specify the power supply device to the following.

Further, in this specification, for easier understanding of the claims, the numbers corresponding to the members shown in the examples are shown in "Claims" and "Means for Solving Problems". It is added to the parts that are used. However, the members shown in the claims are not limited to the members of the embodiment.

1 and 2, a plurality of secondary batteries 1, a temperature sensor 2 for detecting the temperature of exhaust gas discharged from an exhaust valve 4 of each secondary battery 1, and a temperature sensor 2 An exhaust duct 3 that is connected to the secondary battery 1 and discharges exhaust gas to the outside is provided.

The secondary batteries 1 can be connected in series to increase the output voltage and connected in parallel to increase the output current. Therefore, in order to obtain the optimum output voltage and output current for the power supply device, the secondary batteries 1 are connected in series. And the number of parallel connections. For example, a power supply device that is installed in a hybrid car or an electric vehicle and supplies electric power to a traveling motor is connected with a secondary battery 1 so that the output voltage is several hundred V and the maximum output current is several hundred A. In the power supply device, the temperature sensor 2 is a fuse, and the temperature fuse can be melted and used safely in a state higher than the set temperature. However, the temperature sensor 2 is not specified as a temperature fuse. For example, the temperature sensor 2 is used as a temperature detection element such as a thermistor, and a fuse separately provided at the temperature detected by the temperature sensor 2 is blown or connected to the output side. It is also possible to cut off the output relay that is operating.

The secondary battery 1 is a lithium ion secondary battery. A non-aqueous electrolyte secondary battery such as a lithium-ion secondary battery has a large charge/discharge capacity with respect to weight and volume, and can reduce the size and weight of a power supply device to increase the charge/discharge capacity. However, the power supply device of the present invention does not specify the secondary battery as a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery, but can use all secondary batteries currently used or to be developed. Non-aqueous electrolyte secondary batteries such as lithium-ion secondary batteries have a particularly high temperature of the discharged gas, so they can be discharged safely by lowering the temperature of the gas, but also with other secondary batteries, Since the exhaust valve opens in an abnormal use environment, reducing the temperature of the gas discharged from the exhaust valve 4 to discharge the gas has the effect of improving safety.

The exhaust duct 3 is provided with a buffer chamber 5 in order to accurately detect the temperature of the gas exhausted from the exhaust valves 4 of the plurality of secondary batteries 1 having different gas flow path lengths with one temperature sensor 2. ing. The exhaust gas passes through the buffer chamber 5, and the temperature sensor 2 detects the gas temperature. Therefore, the temperature sensor 2 is provided on the discharge side of the buffer chamber 5 and detects the temperature of the gas discharged from the buffer chamber 5. The exhaust duct 3 shown in the figure connects the expansion chamber 6 to the exhaust side of the buffer chamber 5, and lowers the temperature of the gas exhausted from the buffer chamber 5 in the expansion chamber 6 and exhausts it to the outside.

In the buffer chamber 5 of FIGS. 1 and 2, the exhaust valves 4 of the plurality of secondary batteries 1 are connected to the inflow port 7, and the gas discharged from the exhaust valve 4 that opens is introduced into the buffer chamber 5. The temperature of the exhaust gas is detected by the temperature sensor 2 arranged at the exhaust port 8. The buffer chamber directly connects the exhaust valve of the secondary battery to the inflow port, or, although not shown, connects the exhaust valve of the secondary battery to the inflow port through the duct without directly connecting, Alternatively, a plurality of secondary batteries may be used as a battery unit, an exhaust duct connected to the battery unit may be connected to the inlet, and the temperature of gas discharged from the plurality of battery units may be detected by a temperature sensor.

Further, the buffer chamber 5 in these figures is provided with a plurality of inlets 7 on the side surface and an outlet 8 at the end. The buffer chamber 5 of FIG. 1 is provided with a discharge port 8 at one end and the temperature sensor 2 is arranged therein, and the buffer chamber 5 of FIG. 2 is provided with discharge ports 8 at both ends thereof and the temperature sensor 2 is provided at each discharge port 8. It is arranged. The buffer chamber 5 shown in these figures is provided with an exhaust port 8 at its end, and the temperature sensor 2 provided at the exhaust port 8 detects the temperature of the exhaust gas exhausted from each secondary battery 1. The discharge port 8 may be provided in the center of the buffer chamber 5.

As shown in FIG. 1, the device for detecting the temperature of the exhaust gas from all the secondary batteries 1 with one temperature sensor 2 is a distance (L1 to the exhaust valve 4 of each secondary battery 1 from the temperature sensor 2). L2) is set as the shortest distance, and as shown in FIG. 2, the device for detecting the temperature of the exhaust gas from all the secondary batteries 1 by the plurality of temperature sensors 2 includes the exhaust valves 4 of the respective secondary batteries 1. The distance (L1 to L2, L1′ to L2′) to the temperature sensor 2 and the short distance is set as the shortest distance, and the gas flow resistance of the resistance portion is specified. Further, even in a device having a plurality of paths from the exhaust valve 4 of the secondary battery 1 to the temperature sensor 2, the gas flow resistance of the resistance part is specified with the distance in the shortest path as the shortest distance. This is because the gas passing through the passage having the shortest distance from the exhaust valve 4 first reaches the temperature sensor 2 and is detected as the maximum temperature.

3 to 9 are schematic sectional views of the buffer chamber 5. The buffer chamber 5 shown in these figures is provided with an exhaust port 8 in the central portion, and the gas flowing in from each inflow port 7 is exhausted from the exhaust port 8 in the central portion. The buffer chamber 5 adjusts the flow resistance of the gas in the resistance portion at the shortest distance of the gas flow path. 5 is the shortest distance (L1 to L6, L1′ to L6′) from the inflow port 7 to the temperature sensor 2.

The buffer chamber 5 includes a resistance unit 9 that controls the gas flow resistance with the shortest distance of the gas flow path from the exhaust valve 4 of the secondary battery 1 to the temperature sensor 2. The resistance portion 9 has a structure in which the flow resistance of the gas increases as the shortest distance of the gas flow path between the secondary battery 1 and the temperature sensor 2 decreases. The temperature of the gas discharged from each different secondary battery 1 is accurately detected. When the gas temperature is detected by the temperature sensor 2 without providing the resistance portion 9, the temperature of the gas discharged from the secondary battery 1 located near the temperature sensor 2 having the shortest distance is detected high, and the temperature sensor having the shortest distance is detected. This is because the temperature of the gas discharged from the secondary battery 1 at a position away from 2 is detected low.

Hereinafter, specific examples of the buffer chamber 5 are shown in FIGS.
In the buffer chamber 5 of FIG. 3, a resistance part 9 is provided at each inflow port 7 to control the flow resistance of the gas passing through the resistance part 9. The resistance portion 9 of the inflow port 7 is a throttle opening 9A that specifies the gas flow resistance by the opening area. The throttle opening 9A increases the opening area to reduce the gas flow resistance, and reduces the opening area to increase the gas flow resistance. Since the temperature sensor 2 detects a high temperature of the gas discharged from the secondary battery 1 having the shortest distance to the temperature sensor 2, the throttle opening 9A of the resistor portion 9 is connected to the secondary battery 1 having the shortest distance. The opening area of the inflow port 7 is reduced to increase the gas flow resistance. On the contrary, since the temperature sensor 2 detects the temperature of the gas discharged from the secondary battery 1 having the longest short distance low, the throttle opening 9A of the resistance portion 9 is connected to the secondary battery 1 having the longest shortest distance. The opening area of the inflow port 7 is increased to increase the gas flow resistance.

In the buffer chamber 5 of FIG. 3, the gas discharged from the secondary battery 1 near the temperature sensor 2 is passed through the throttle opening 9A having a small opening area having a large gas flow resistance and flown into the buffer chamber 5. The exhaust gas passing through the small inflow port 7 flows at high speed and flows into the buffer chamber 5. The exhaust gas that flows at high speed and flows into the buffer chamber 5 stirs the air in the buffer chamber 5 having a low temperature, is sufficiently mixed, the temperature is lowered, and the exhaust gas is exhausted from the exhaust port 8. On the contrary, the exhaust gas from the secondary battery 1 which is far away from the temperature sensor 2 flows into the buffer chamber 5 from the large inflow port 7 having a small gas flow resistance without flowing at high speed, and the air in the buffer chamber 5 is discharged. Is mixed with the air in the buffer chamber 5 and the temperature is not lowered and the gas is discharged from the discharge port 8.

The above-mentioned buffer chamber 5 mixes the exhaust gas from the secondary battery 1 with the room temperature air in the buffer chamber 5 and discharges it. However, the exhaust gas from the secondary battery 1 near the temperature sensor 2 is not the room temperature air. The mixing ratio becomes high and the temperature drop due to the room temperature air is large. On the contrary, the exhaust gas from the secondary battery 1 which is separated from the temperature sensor 2 has a small mixing ratio with the room temperature air, and the temperature drop due to the room temperature air is small. The exhaust gas from the secondary battery 1 which is close to the temperature sensor 2 and whose gas temperature is detected high has a large temperature drop in the buffer chamber 5, and is separated from the temperature sensor 2 to detect a low gas temperature from the secondary battery 1. Since the temperature of the exhaust gas decreases in the buffer chamber 5, the temperature sensor 2 accurately detects the temperature of the exhaust gas from the plurality of secondary batteries 1 having different shortest distances.

In the buffer chamber 5 of FIG. 4, a resistance part 9 is provided at each inflow port 7 to control the flow resistance of the gas passing through the resistance part 9, but the resistance part 9 limits the gas flow resistance of the inflow port 7. 9B. In the buffer chamber 5, the gas flow resistance of the filter medium 9B provided at the inlet 7 between the secondary battery 1 near the temperature sensor 2 and the inlet 7 between the secondary battery 1 remote from the temperature sensor 2 is detected. The flow resistance of gas is made larger than that of the filter medium 9B provided in the above. In the embodiment of the present invention, the filter medium may have any structure that increases the flow path resistance, such as a mesh structure, and in particular, any material may be used to form the filter medium.

The filter medium 9B adjusts the flow resistance of the gas by the size and porosity of the voids through which the gas passes. The filter material 9B has a small void and a low void ratio to increase the gas flow resistance. Since the temperature sensor 2 detects a high temperature of the gas discharged from the secondary battery 1 having the shortest distance to the temperature sensor 2, the throttle opening 9A of the resistance portion 9 is connected to the secondary battery 1 having the shortest distance. The flow resistance of the gas of the filter medium 9B at the inflow port 7 is increased. On the contrary, since the temperature sensor 2 detects the temperature of the gas discharged from the secondary battery 1 having the longest short distance low, the throttle opening 9A of the resistance portion is connected to the secondary battery 1 having the longest shortest distance. The gas flow resistance of the filter medium 9B at the inlet 7 is reduced.

In the buffer chamber 5 described above, a filter medium 9B is provided at the inflow port 7, and the filter medium 9B is used as the resistance portion 9 to specify the gas flow resistance. The buffer chamber 5 allows exhaust gas from the secondary battery 1 near the temperature sensor 2 to pass through the filter medium 9B having a large gas flow resistance. The filter medium 9B having a small mesh having a large passage resistance diffuses and allows the exhaust gas to pass without vigorously and straightly passing the exhaust gas, and sufficiently mixes with the room temperature air in the chamber to lower the temperature at the room temperature air. To increase.

On the contrary, the exhaust gas from the secondary battery 1 far away from the temperature sensor 2 smoothly passes through the filter medium 9B having a small gas flow resistance, that is, a large mesh, and therefore passes through the filter medium 9B to reach the normal temperature in the buffer chamber 5. It is not sufficiently mixed with air, and the temperature decrease due to mixing with room temperature air is reduced. Exhaust gas from the secondary battery 1 close to the temperature sensor 2 passes through the filter medium 9B and has a large temperature drop due to mixing with room temperature air, and exhaust gas from the secondary battery 1 away from the temperature sensor 2 passes through the filter medium 9B. Since the temperature drop due to mixing with normal temperature air after passing through is reduced, the temperature of the exhaust gas of the plurality of secondary batteries 1 having different gas flow path lengths can be more accurately detected with one temperature sensor 2.

The buffer chamber 5 of FIG. 5 is provided with a resistance portion including a baffle plate 9C in order to adjust the gas flow resistance according to the shortest distance of the gas flow path from the exhaust valve 4 of the secondary battery 1 to the temperature sensor 2. The baffle plate 9C is in the passage of the gas flowing into the buffer chamber 5 from the inflow port 7, and controls the flow resistance of the gas in a state where the inflowing gas collides.

The baffle plate 9C shown in the drawing has a posture intersecting with the flow direction in order to collide the inflowing gas, and is arranged at a position facing the inflow port 7. The baffle plate 9C approaches the inflow port 7 to narrow the gap with the inflow port 7 to increase the gas flow resistance, and is separated from the inflow port 7 to widen the gap with the inflow port 7 to flow the gas. The resistance is reduced.

The baffle plate 9C measures the gas flow resistance of the baffle plate 9C arranged at a position facing the inflow port 7 connected to the secondary battery 1 having a shortest gas flow path distance from the exhaust valve 4 to the temperature sensor 2, The gas flow resistance is set to be larger than the gas flow resistance of the baffle plate 9C arranged at the position facing the inflow port 7 connected to the secondary battery 1 having the shortest gas flow path distance. In the buffer chamber 5 of FIG. 3, the gas flow resistance is specified by the distance between the inflow port 7 and the baffle plate 9C. The baffle plate 9C disposed at the position close to the inflow port 7 has a large gas flow resistance, and is disposed at a position opposite to the inflow port 7 connected to the secondary battery 1 having a long gas channel shortest distance. The baffle plate 9C is separated from the inflow port 7 to reduce the gas flow resistance.

The above buffer chamber 5 allows the exhaust gas from the secondary battery 1 having the shortest gas flow path to pass through a narrow gap between the inflow port 7 and the baffle plate 9C, that is, a resistance portion having a large gas flow resistance. 9 is passed to lower the temperature of the exhaust gas to reach the temperature sensor 2. This is because the exhaust gas passes through a narrow gap between the inflow port 7 and the baffle plate 9C, is strongly diffused into the air having a low temperature in the buffer chamber 5, that is, room temperature air, and is sufficiently mixed with room temperature air.

On the contrary, the gas discharged from the secondary battery 1 having the longest distance of the gas flow path passes the exhaust gas from the secondary battery 1 through a wide gap between the inflow port 7 and the baffle plate 9C, that is, the gas The temperature sensor 2 is reached through the resistance portion 9 having a small flow resistance. The exhaust gas that passes through the wide gap and reaches the temperature sensor 2 is not sufficiently mixed with the room temperature air in the buffer chamber 5, and there is a small rate that the temperature is decreased by being mixed with the room temperature air. The temperature is detected by the temperature sensor 2 in a small state.

Therefore, the exhaust gas from the secondary battery 1 having the shortest distance of the gas flow path is sufficiently mixed with the room temperature air in the buffer chamber 5 to lower the temperature and is detected by the temperature sensor 2, and the shortest distance of the gas flow path is detected. Exhaust gas from the secondary battery 1 having a long distance passes through the buffer chamber 5 with a decrease in temperature due to mixing with room temperature air being reduced, and is detected by the temperature sensor 2. In the power supply device described above, the temperature of the exhaust gas, which has been detected close to the temperature sensor 2 and whose detection temperature is high, is greatly reduced in the buffer chamber 5, and the exhaust gas whose detection temperature is detected low apart from the temperature sensor 2 is discharged. By reducing the temperature drop of the gas, the temperature sensor 2 can detect accurately regardless of the difference in the length of the shortest distance.

The resistance portion 9 of the buffer chamber 5 in FIG. 6 adjusts the flow resistance of gas by the size of the baffle plate 9D provided at the position facing the inflow port 7. Since the buffer chamber 5 specifies the gas flow resistance by the size of the baffle plate 9D, the baffle chamber 5 is located at the position opposite to the inlet port 7 connected to the secondary battery 1 having the shortest gas flow path. The plate 9D is made large to increase the gas flow resistance, and the baffle plate 9D arranged at the position opposite to the inflow port 7 connected to the secondary battery 1 having the longest gas flow path length is made small to reduce the gas flow. Reduce flow resistance.

In the buffer chamber 5 described above, the exhaust gas from the secondary battery 1 having the shortest gas flow path collides with the large baffle plate 9D to increase the flow resistance of the gas. The exhaust gas that has collided with the large baffle plate 9D is dispersed on both sides, and is effectively mixed by the room temperature air in the buffer chamber 5 to greatly reduce the temperature. On the contrary, the gas discharged from the secondary battery 1 having a long shortest distance of the gas flow path causes the exhaust gas from the secondary battery 1 to collide with the small baffle plate 9D. It is not mixed, but the ratio of the temperature being lowered by being mixed with normal temperature air is reduced.

Therefore, the exhaust gas from the secondary battery 1 having the shortest distance of the gas flow path is sufficiently mixed with the room temperature air in the buffer chamber 5 to lower the temperature and is detected by the temperature sensor 2, and the shortest distance of the gas flow path is detected. Exhaust gas from the secondary battery 1 having a long distance passes through the buffer chamber 5 with a decrease in temperature due to mixing with room temperature air being reduced, and is detected by the temperature sensor 2. In the power supply device described above, the temperature of the exhaust gas, which has been detected close to the temperature sensor 2 and whose detection temperature is high, is greatly reduced in the buffer chamber 5, and the exhaust gas whose detection temperature is detected low apart from the temperature sensor 2 is discharged. By reducing the temperature drop of the gas, the temperature sensor 2 can detect accurately regardless of the difference in the length of the shortest distance.

The resistance portion 9 of the buffer chamber 5 in FIG. 7 adjusts the flow resistance of gas by the posture of the baffle plate 9E provided at the position facing the inflow port 7, that is, the angle with respect to the flow direction of gas. Since the buffer chamber 5 specifies the gas flow resistance by the angle of the baffle plate 9E, the baffle plate arranged at the position opposite to the inflow port 7 connected to the secondary battery 1 having the shortest gas flow path distance. 9E has a large loss of kinetic energy due to the collision of exhaust gas, and in order to reduce the flow velocity after the collision and cause it to flow to the exhaust port 8, the flow resistance of gas is set to be a direction perpendicular to the flow direction of gas. Enlarge. The baffle plate 9E connected to the secondary battery 1 having the longest gas flow path is perpendicular to the flow direction of the gas so that the flow direction of the exhaust gas that collides and changes its direction is toward the discharge port 8. The flow resistance of the gas is reduced by setting the angle of inclination from the direction.

In the buffer chamber 5 described above, the exhaust gas from the secondary battery 1 having the shortest gas flow path collides with the baffle plate 9E that is perpendicular to the gas flow direction and is dispersed on both sides. The room temperature air in the mixture effectively mixes and the temperature drops significantly. On the contrary, since the gas discharged from the secondary battery 1 having the longest gas flow path has the flow direction of the exhaust gas from the secondary battery 1 changed to the discharge port 8, the temperature in the buffer chamber 5 is kept at room temperature. It is not sufficiently mixed with air, and the rate of temperature decrease due to room temperature air is reduced.

Therefore, the exhaust gas from the secondary battery 1 having the shortest distance of the gas flow path is sufficiently mixed with the room temperature air in the buffer chamber 5 to lower the temperature and is detected by the temperature sensor 2, and the shortest distance of the gas flow path is detected. Exhaust gas from the secondary battery 1 having a long distance passes through the buffer chamber 5 with a decrease in temperature due to mixing with room temperature air being reduced, and is detected by the temperature sensor 2. In the power supply device described above, the temperature of the exhaust gas, which has been detected close to the temperature sensor 2 and whose detection temperature is high, is greatly reduced in the buffer chamber 5, and the exhaust gas whose detection temperature is detected low apart from the temperature sensor 2 is discharged. By reducing the temperature drop of the gas, the temperature sensor 2 can detect accurately regardless of the length of the shortest distance.

The resistance portion 9 of the buffer chamber 5 shown in FIG. 8 adjusts the flow resistance of gas with a plurality of baffles 9F provided at the positions facing the inflow port 7. This buffer chamber 5 is provided with a plurality of baffles 9F in the gas flow path, and gas is passed between the baffles 9F to specify the gas flow resistance. The buffer chamber 5 is provided with a large number of baffles 9F in the gas flow path, and allows the gas to pass between the narrow baffles 9F to increase the flow resistance of the gas. Therefore, a large number of baffles 9F are provided between the inlet 7 and the outlet 8 connected to the secondary battery 1 having the shortest distance to narrow the gap between the baffles 9F to narrow the exhaust gas. It is passed between the baffles 9F to increase the flow resistance of gas. In the gas flow path of the secondary battery 1 having the largest shortest distance of the gas flow path, no baffle plate 9F is provided, or a small number of baffle plates 9F are provided to widen the gap between the baffle plates 9F to allow gas flow. Reduce the resistance.

In the buffer chamber 5 described above, the exhaust gas from the secondary battery 1 having a shortest gas flow path passes between a large number of baffles 9F to pass a long path and a long path. The temperature of the air in the buffer chamber 5 is sufficiently mixed with the normal temperature air to greatly reduce the temperature. On the contrary, the gas discharged from the secondary battery 1 having a large shortest distance of the gas passage does not pass between the baffles 9F or passes through a wide gap of the small baffles 9F to shorten the gas passage. Further, the mixing with the normal temperature air in the buffer chamber 5 is reduced, and the rate of temperature decrease due to the normal temperature air is reduced.

Therefore, the exhaust gas from the secondary battery 1 having the shortest distance of the gas flow path passes through the long flow path, and is sufficiently mixed with the room temperature air in the buffer chamber 5 to lower the temperature, and the temperature sensor 2 The exhaust gas detected and discharged from the secondary battery 1 having the longest gas flow path is buffered by the baffle plate 9F without causing the gas flow path to become long and reducing the temperature decrease due to the mixing with room temperature air. The temperature is detected by the temperature sensor 2 after passing through the chamber 5. Therefore, in the above power supply device, the temperature of the exhaust gas, which has been detected close to the temperature sensor 2 and whose detection temperature is high, is greatly reduced in the buffer chamber 5, and the detection temperature is detected low apart from the temperature sensor 2. By reducing the temperature drop of the exhaust gas that has been performed, the temperature sensor 2 can accurately detect the gas temperature regardless of the size of the shortest distance.

The resistance part 9 of the buffer chamber 5 of FIG. 9 adjusts the flow resistance of gas by changing the flow path length from each inflow port 7 to the exhaust port 8 with the wall body 10. In the wall body 10, the flow path length from the inflow port 7 with the shortest distance of the gas flow path to the exhaust port 8 is longer than the flow path length from the inflow port 7 with the shortest gas flow path distance to the exhaust port 8. doing. When the exhaust gas flows through the flow path in the buffer chamber 5, heat is taken by the surroundings and the temperature of the exhaust gas lowers. Therefore, when the exhaust gas flows through the long flow path and the temperature is detected by the temperature sensor 2, the temperature detected by the temperature sensor 2 becomes low, and conversely, the exhaust gas flows through the short flow path and the temperature sensor 2 detects the temperature. Then, the temperature detected by the temperature sensor 2 is detected high. Therefore, the exhaust gas from the secondary battery 1 having the shortest distance to the temperature sensor 2 is detected high by the temperature sensor 2, and the exhaust gas from the secondary battery 1 having the longest shortest distance to the temperature sensor 2 has the temperature Since the buffer chamber 5 shown in the figure has a wall body 10 provided therein, the buffer chamber 5 shown in the figure has a flow path length from the inlet port 7 to the outlet port 8 where the shortest distance of the gas channel is small. The length of the flow path from the inflow port 7 to the exhaust port 8 having the shortest path length is made longer to accurately detect the temperature of the exhaust gas from the plurality of secondary batteries 1 with a small detection error.

The power supply device of the present invention can be effectively used as a high output power supply device including a large number of secondary batteries 1.

It is a schematic sectional drawing of the power supply device concerning the Example of this invention. It is a schematic sectional drawing of the power supply device concerning the other Example of this invention. It is a sectional view of a buffer chamber concerning an example of the present invention. FIG. 6 is a sectional view of a buffer chamber according to another embodiment of the present invention. FIG. 6 is a sectional view of a buffer chamber according to another embodiment of the present invention. FIG. 6 is a sectional view of a buffer chamber according to another embodiment of the present invention. FIG. 6 is a sectional view of a buffer chamber according to another embodiment of the present invention. FIG. 6 is a sectional view of a buffer chamber according to another embodiment of the present invention. FIG. 6 is a sectional view of a buffer chamber according to another embodiment of the present invention. 5 is a graph showing a temperature change of exhaust gas discharged from a secondary battery.

1...Secondary battery 2...Temperature sensor 3...Exhaust duct 4...Exhaust valve 5...Buffer chamber 6...Expansion chamber 7...Inflow port 8...Exhaust port 9...Resistance part
9A... Aperture opening 9B... Filter medium 9C... Baffle plate (Fig. 5)
9D... Baffle plate (Fig. 6)
9E... Baffle plate (Fig. 7)
9F...Baffle plate (Fig. 8)
10... Wall

Claims (9)

A plurality of secondary batteries having an exhaust valve that opens and discharges gas when the pressure becomes higher than a threshold pressure;
A temperature sensor for detecting the temperature of the gas discharged from the exhaust valve of the secondary battery;
A power supply device comprising an exhaust duct connected between the temperature sensor and the secondary battery,
The exhaust duct comprises a buffer chamber for passing exhaust gas from the exhaust valve,
The buffer chamber has an inlet for the exhaust gas, an outlet for the gas introduced from the inlet, and a gas flow at the shortest distance of the gas flow path from the exhaust valve of the secondary battery to the temperature sensor. Equipped with a resistance part that specifies the resistance,
A power supply device characterized in that the resistance portion has a structure in which the gas flow resistance increases as the shortest distance of the gas flow path between the secondary battery and the temperature sensor decreases. The power supply device according to claim 1, wherein
The inlet of the buffer chamber is directly or indirectly connected to an exhaust valve of each secondary battery,
The resistance portion is a throttle opening provided at the inflow port,
The throttle opening has an opening area of the inlet provided between the secondary battery having a shortest distance to the temperature sensor and the secondary battery having a shortest distance to the temperature sensor. A power supply device characterized in that it is smaller than the opening area of the inflow port provided. The power supply device according to claim 1, wherein
The inlet of the buffer chamber is directly or indirectly connected to an exhaust valve of each secondary battery,
The resistance portion is a filter medium that limits the gas flow resistance of the inlet,
The gas flow resistance of the filter medium provided at the inlet between the secondary battery near the temperature sensor and the secondary battery is greater than the gas flow resistance at the inlet between the secondary battery far from the temperature sensor. A power supply device characterized by the above. The power supply device according to claim 1, wherein
The inlet of the buffer chamber is directly or indirectly connected to an exhaust valve of each secondary battery,
A baffle plate in which the resistance portion is in a passage of gas flowing into the buffer chamber from the inflow port, and is arranged in a posture intersecting a flow direction of gas
The secondary battery having a shortest distance from the temperature sensor has a gas flow resistance due to a baffle plate provided between the inlet and the outlet which is connected to the secondary battery having a shortest distance from the temperature sensor. A power supply device characterized in that it is larger than the gas flow resistance of the baffle plate provided between the inflow port and the exhaust port connected to the. The power supply device according to claim 4, wherein
The inlet of the buffer chamber is directly or indirectly connected to an exhaust valve of each secondary battery,
The resistance portion is a baffle plate provided in a flow path of gas flowing into the buffer chamber from the inlet,
The baffle specifies the gas flow resistance in the interval between the inlet and the baffle,
The resistance part is characterized in that the baffle plate having a large gas flow resistance is closer to the inlet than the baffle plate having a small gas flow resistance. The power supply device according to claim 4, wherein
The inlet of the buffer chamber is directly or indirectly connected to an exhaust valve of each secondary battery,
The resistance portion is a baffle plate provided in a flow path of gas flowing into the buffer chamber from the inlet,
The gas flow resistance is specified by the area of the baffle,
The power supply device is characterized in that the baffle plate having a large gas flow resistance has a larger area than the baffle plate having a small gas flow resistance. The power supply device according to claim 4, wherein
The inlet of the buffer chamber is directly or indirectly connected to an exhaust valve of each secondary battery,
The resistance portion is a baffle plate provided in a flow path of gas flowing into the buffer chamber from the inlet,
The gas flow resistance is specified by the angle with respect to the gas flow direction of the baffle plate,
A power supply device characterized in that an angle of a baffle plate having a large gas flow resistance with respect to a gas flow direction is orthogonal to a gas flow direction of a baffle plate having a small gas flow resistance. The power supply device according to claim 1, wherein
The resistance portion of the buffer chamber is a wall body that changes the flow path length from the inflow port to the exhaust port,
The wall body provided in the flow passage of the inlet close to the temperature sensor is arranged at a position where the flow passage is longer than the wall body provided in the flow passage of the inlet far from the temperature sensor. Power supply device characterized by. The power supply device according to any one of claims 1 to 8, wherein
A power supply device in which the temperature sensor is a thermal fuse.

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