JP2001091363A - Abnormal temperature detecting device for set battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect an abnormal temperature adequately by reducing heat transfer loss and also to reduce the cost by reducing the number of temperature sensor units and the manhour for installation. SOLUTION: In a set battery 1, a plurality of unit batteries 2 in a rectangular parallelopiped type which are constituted by arranging a plurality of single batteries 3 are arranged in parallel in the direction rectangular to the arrangement direction of the single batteries 3. A temperature sensor unit 5 constituted by connecting a necessary number of temperature sensors 6 at suitable intervals is arranged between the unit batteries 2, 2, and made to reciprocate at least one time along the single battery arrangement direction of the unit batteries 2. As a result, the number of the temperature sensor units 5 is made smaller than at least one-half of the number of each of the unit batteries 2. By detecting a temperature on the side surface of each of the single batteries 3, the heat transfer distance from a pole plate group of the single batteries 3 is made minimum, and heat transfer loss is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormal temperature detecting device for detecting an abnormal temperature of each unit cell in a battery pack having a plurality of unit cells arranged in series and a plurality of unit cells arranged in parallel. It is.

[0002]

2. Description of the Related Art In a conventional apparatus for detecting abnormal temperature of an assembled battery as described above, as shown in FIG. 10, each unit cell 31 in which a plurality of unit cells 32 are arranged in series is connected to each unit cell 3.
A temperature sensor unit 33 formed by connecting a plurality of temperature sensors 34 corresponding to 2 is attached. FIG. 10A shows a rectangular plate-shaped unit battery 31 in which rectangular parallelepiped unit cells 32 are arranged in series in the long side direction, and a temperature sensor unit 33 is attached to an upper surface 35 of the battery case by attaching. In FIG. 10B, a unit cell 31 is formed by connecting a plurality of cylindrical unit cells 32 in series. In this case, the temperature sensor unit 33 is attached to the outer surface of the unit cell 31 in a straight line parallel to the axis. We attach and attach. Then, the temperature sensor units 33 are connected in series with the unit batteries 31 arranged in parallel, and both ends of the temperature sensor units 33 are connected to the detection device.

[0003]

However, in the configuration of the abnormal temperature detecting device as shown in FIG. 10, the temperature sensor unit 33 is attached to each unit battery 31, so that the unit battery 31 constituting the assembled battery is different from the unit battery 31. The same number of temperature sensor units 3
3 is required, the number of parts is increased, and the number of mounting steps is also increased.

Further, in the case of using a rectangular plate-shaped unit battery 31 shown in FIG.
Since the temperature sensor unit 33 is disposed on the upper side, the distance between the electrode group, which is a high-temperature source, and the temperature sensor 34 is large, and the resin between them is thicker than the gas phase and other parts of the battery case. Due to the presence of the wall, the heat transfer loss is large, making it difficult to reliably detect abnormal temperatures when the battery is abnormal.Furthermore, depending on the type of battery abnormality and the degree of progress of battery deterioration, it is difficult to detect at an appropriate temperature and the battery case There was a problem that destruction might not be prevented.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, the present invention makes it possible to reduce the number of temperature sensor units and the number of mounting steps, thereby reducing costs, and to detect heat abnormalities of batteries with small heat transfer losses. It is an object of the present invention to provide an abnormal temperature detecting device for a battery pack.

[0006]

According to a first aspect of the present invention, there is provided an abnormal temperature detecting apparatus for an assembled battery in which a plurality of unit cells having a rectangular parallelepiped shape in which a plurality of unit cells are arranged in series are arranged. In battery packs arranged in parallel in the direction perpendicular to the direction, a temperature sensor unit comprising a required number of temperature sensors connected at appropriate intervals is arranged between the unit cells, and each temperature sensor is placed in a proper position on the side of each cell. The heat transfer distance between the unit cell and the electrode group can be minimized by detecting the temperature at the side of each unit cell, and the unit is arranged on the upper surface of the battery case of the unit cell. The heat transfer loss is smaller than in the case, and the abnormal temperature of the battery can be appropriately detected.

In addition, when the temperature sensor unit has a length that makes at least one reciprocation along the unit cell arrangement direction of the unit cells, the number of the temperature sensor units is at least half or less of the number of the unit cells, Further, when a temperature sensor unit is disposed between two unit batteries and one temperature sensor detects abnormal temperatures of the unit cells on both sides thereof, the temperature sensor unit can be reduced to about half the temperature. And the number of mounting steps can be reduced, and the cost can be reduced.

Further, when each temperature sensor of the temperature sensor unit is fixed at a position near the maximum temperature region of the unit cell on the side surface of the unit cell, the maximum temperature of each unit cell can be detected with a small heat transfer loss, and the abnormality of the cell can be detected. The temperature can be detected appropriately.

Further, when the wall thickness of the temperature sensor unit on the side surface of the unit battery is reduced, the heat transfer loss can be further reduced.

[0010] Further, a cooling medium passage is formed between the unit cells, and a cooling avoiding projection for guiding the cooling medium to flow avoiding the temperature sensor at a lower portion or an upper and lower portion of a place where the temperature sensor is disposed between the unit cells. Is provided, the influence of the detected temperature due to the flow of the cooling medium can be suppressed, and the abnormal temperature of the battery can be appropriately detected.

Further, the abnormal temperature detecting device for a battery pack according to the second invention of the present application provides a unit battery comprising a plurality of unit cells arranged in series, the number of which is larger than the number of unit cells provided in each unit cell. In a battery pack arranged in parallel in a direction orthogonal to the direction in which the unit cell rows are arranged, a temperature sensor unit formed by connecting a required number of temperature sensors at appropriate intervals is arranged in the unit cell array direction, and each temperature The sensor is fixed to the temperature detecting portion of each cell sequentially, and the temperature sensor unit has at least one reciprocating length in the arrangement direction of the unit cells, and the number of the temperature sensor units is the unit cell in the unit cell. And the number of temperature sensor units and the number of mounting steps can be reduced, and the cost can be reduced.
In particular, when the assembled battery is composed of a large number of unit batteries, the cost can be significantly reduced.

Further, when a temperature detection hole reaching the upper end of the electrode plate group of each unit cell is provided on the upper surface of the battery case of the unit battery, the temperature sensor unit can be easily arranged on the upper surface of the battery case of the unit battery. The temperature at the upper end of the electrode group, which is the highest temperature, can be detected with extremely low heat transfer loss, and the wall thickness of the bottom wall of the temperature detection hole can be reduced. By making it thinner than the surrounding wall,
Further, heat transfer loss can be reduced, and abnormal temperature of the battery can be appropriately detected.

Further, a metal body for heat transfer is inserted and arranged in the temperature detecting hole, and a temperature sensor is arranged in contact with the upper surface of the metal body. When a good heat transfer sheet is interposed, the temperature sensor unit can be easily arranged along the upper surface of the battery case, and the abnormal temperature of the battery can be properly detected with a small heat transfer loss via the metal body. it can.

Further, if fixed claws for holding the temperature sensor between the metal body and the metal sensor are provided on the side of the temperature detecting hole on the upper surface of the battery case of the unit battery, the temperature sensors can be easily inserted into each fixed claw one by one. The temperature sensor unit can be arranged with good workability.

Further, when a temperature sensor is arranged at the bottom of the temperature detection hole, an abnormal temperature of the battery can be appropriately detected with little heat transfer loss.

Further, if the temperature sensors are arranged between the unit cells adjacent to each other and the abnormal temperature of both the cells is detected by one temperature sensor, the number of the temperature sensor units is further reduced. And cost reduction can be achieved.

Further, the abnormal temperature detecting apparatus for a battery pack according to the third aspect of the present invention includes a unit battery comprising a plurality of unit cells arranged in series.
In an assembled battery arranged in parallel in a direction orthogonal to the arrangement direction of the unit cells, a temperature sensor unit formed by connecting a required number of temperature sensors at appropriate intervals is arranged in the longitudinal direction or the arrangement direction of the unit cells, A temperature detection hole is provided on the upper surface of the battery case of the unit battery to reach near the upper end of the electrode plate group of each unit cell, and a metal body for heat transfer is inserted and arranged in the temperature detection hole, and a temperature sensor is provided on the upper surface of the metal body. The temperature sensor unit is arranged along the upper surface of the battery case as described above to facilitate the installation work, and the battery is placed in a state where the heat transfer loss is small via the metal body. The abnormal temperature can be appropriately detected.

Further, the thickness of the bottom wall of the temperature detecting hole is made thinner than the peripheral wall, and a heat transfer sheet having good adhesion is interposed between the metal body and the temperature sensor. The above effects can be obtained by providing fixed claws for holding the temperature sensor between the metal body and the side of the detection hole.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the apparatus for detecting abnormal temperature of a battery pack according to the present invention will be described below with reference to FIGS.

1 to 4, a battery pack 1 according to the present embodiment is configured so as to be suitably used as a drive power source for an electric vehicle, and includes a prismatic nickel-hydrogen secondary battery. A plurality of flat unit batteries 2 are arranged in parallel. The unit batteries 2 arranged in parallel have end plates (not shown) arranged at both ends in the parallel direction.
Is tightened with a plurality of restraining bands (not shown).
It is integrated as.

Each unit cell 2 is composed of a plurality of (six in the illustrated example) rectangular parallelepiped single cells 3 having a narrow short side surface and a wide long side surface, connected in series on the short side surface, and integrated. It is configured. Each cell 3 is configured by storing an electrode plate group formed by laminating a large number of positive and negative electrode plates parallel to the long side surface thereof in the short side direction via a separator in a battery case, and an electrolytic solution. The battery 2 is configured by electrically connecting the six single cells 3 internally in series. A gap serving as a cooling medium passage 4 for effectively cooling each unit cell 3 is formed between the unit cells 2 and 2.

With respect to each of the cells 3 constituting the assembled battery 1, when any of the cells 3 has an abnormal temperature, the temperature is detected to prevent the battery case from being destroyed. The sensor unit 5 is disposed between the unit batteries 2 and 2 and fixed to the side surfaces of the battery case on both sides.

As shown in FIGS. 5 and 6, a required number of temperature sensors 6 are disposed at appropriate intervals corresponding to the intervals at which the cells 3 are disposed, and the temperature sensor units 5 are sequentially connected by leads 7 as shown in FIGS. A sensor assembly 9 whose outer periphery is covered with a protective tube 8 is connected to one end of each of the plurality of sensor assemblies 9 by a lead wire 10 if necessary, thereby forming a unit. Is provided.
The temperature sensor 6 is composed of a resin switch in which conductive particles are dispersed in a resin that expands when the temperature rises, and a foam that absorbs the expansion of the resin is attached to both surfaces thereof. This is to detect that the temperature has reached a certain temperature or higher due to the separation of the conductive particles and the increase in resistance.

As shown in FIG. 1, a plurality of the temperature sensor units 5 are provided in the battery pack 1, and the connection terminals 11 of the temperature sensor unit 5 are connected to each other in series by a connector 12. And both ends are connected to a temperature detection device (not shown).

The temperature sensor unit 5 is similar to that shown in FIG.
As shown in FIG. 2, the temperature sensor 6 is disposed on the side wall portion facing the center of the upper end portion of the electrode group at which the temperature of each cell 3 becomes the highest. Further, both sensor assemblies 9 connected by the lead wire 10 of the temperature sensor unit 5 are disposed between the unit batteries 2, 2, respectively. The two sensor assemblies 9 are disposed between the two unit batteries 2 as shown in FIG. Opposing cells 3,
3 is detected by one temperature sensor 6.

Further, since the temperature sensor unit 5 is disposed in the cooling medium passage 4 between the unit batteries 2 and 2, the temperature sensor 6 may not be able to perform appropriate temperature detection due to the influence of the flow of the cooling medium. In order to suppress this, as shown in FIG. 2, the upper and lower portions of the side of the unit cells 2 and 2 where the temperature sensor 6 is disposed are provided with upper and lower guides for guiding the cooling medium so as to avoid the temperature sensor 6. A cooling avoiding protrusion 13 protruding in a chevron shape is formed. In FIG. 2, reference numeral 14 denotes ribs provided on the side surfaces of the unit cells 2 to form the cooling medium passage 4.

Further, as shown in FIG. 4, a sensor arrangement groove 15 is formed at the side of the unit battery 2 where the temperature sensor unit 5 is arranged, and the temperature sensor 6 of the temperature sensor unit 5 is formed in the sensor arrangement groove 15. It is preferable to house and arrange a part of the lead 7 and the entire lead 7. Thereby, the temperature sensor 6
In this arrangement, the wall thickness of the battery case of the unit cell 3 can be reduced, and the narrowing of the passage cross-sectional area of the cooling medium passage 4 in the temperature sensor unit 5 can be minimized. In FIG. 4, 1
Reference numeral 6 denotes a heat transfer adhesive sheet for fixing the temperature sensor 6 to the bottom surface of the sensor arrangement groove 15, reference numeral 17 denotes an electrode group of the unit cells 3, and reference numeral 18 denotes a flow of a cooling medium.

According to the above configuration, since the temperature is detected on the side surface of each unit cell 3 in the unit cell 2, the heat transfer distance between the electrode plate group 17 of the unit cell 3, particularly the highest temperature region at the upper end thereof, is minimized. The heat transfer loss is smaller than when the unit cells 2 are disposed on the upper surface, and the abnormal temperature of each unit cell 3 can be appropriately detected.

The temperature sensor unit 5 is connected to the unit battery 2
Are arranged so as to make one reciprocation in a U-shape along the direction in which the unit cells 3 are arranged, so that the number of the temperature sensor units 5 arranged in the battery pack 1 is at least half of the number of the unit cells 2. The temperature sensor unit 5 is disposed between the two unit batteries 2 and 2 so that one temperature sensor 6 detects abnormal temperatures of the cells 3 and 3 on both sides thereof. Therefore, the number of the temperature sensor units 5 and the number of mounting steps can be reduced, and the cost can be reduced.

As shown in FIG. 4, when the temperature sensor unit 5 is disposed in the sensor arrangement groove 15 and the wall thickness of the location where the temperature sensor 6 is disposed is reduced, the heat transfer loss can be further reduced. The abnormal temperature can be appropriately detected.

Next, a second embodiment of the abnormal temperature detecting device for a battery pack according to the present invention will be described with reference to FIGS. Note that the components described in the above embodiment are denoted by the same reference numerals, description thereof will be omitted, and only different points will be described.

As shown in FIG. 7, the assembled battery 1 of the present embodiment is designed so that a predetermined output voltage of 150 to 300 V is obtained. 20 to 40 unit batteries 2 are arranged in parallel and connected in series, and end plates 1 are provided at both ends thereof.
9 and 19 are provided and are integrated by being restrained by a restraining band (not shown). Then, a pair of sensor assemblies 9, 9 formed by connecting a required number of temperature sensors 6 corresponding to the number of the unit batteries 2 arranged at intervals of the unit batteries 2 are connected to lead wires 10.
The temperature sensor unit 5 is connected so as to make one reciprocation in a U-shape in the arrangement direction of the unit batteries 2.
In the illustrated example, three temperature sensor units 5 are provided corresponding to the six single cells 3, which are connected in series by a connector 12, and both ends of which are connected to a temperature detecting device (not shown). Have been.

A temperature detecting hole 21 is provided on the upper surface 20 of the battery case of the unit battery 2 for each unit cell 3 to reach near the upper end of the electrode plate group 17, and the bottom wall 2 of the temperature detecting hole 21 is provided.
The wall thickness of 1a is formed thinner than the peripheral wall. And
A metal body 22 for heat transfer is inserted and arranged in the temperature detection hole 21, and the temperature sensors 6 of the temperature sensor unit 5 are arranged on the upper surface thereof via a heat transfer sheet 23. The electric heating sheet 23 is a sheet made of a material having high adhesiveness and high heat conductivity to both the metal body 22 and the temperature sensor 6. In addition, each temperature detection hole 2
A hook-shaped fixing claw 24 for holding the temperature sensor 6 between the metal body 22 and the temperature sensor 6 is protrudingly provided on a side portion 1.

In FIG. 8, reference numerals 25a and 25b denote electrode group 1
7 are current collector plates for the positive electrode and the negative electrode arranged on both sides of the current collector 7.
a, 25b. Reference numeral 27 denotes a sealing material for sealing between the adjacent cells 3 and
It is attached to the outer peripheral part.

According to the above configuration, the temperature sensor units 5 are disposed so as to make one reciprocation in a U-shape in the arrangement direction of the unit batteries 2. Only half the number of batteries 3 is required, and the number of temperature sensor units 5 and the number of mounting steps can be reduced to reduce the cost. Especially when the assembled battery 1 is composed of a large number of unit batteries 2, The cost can be reduced. Furthermore, since the fixed claws 24 are provided, the temperature sensor unit can be easily and efficiently arranged simply by inserting the temperature sensor 6 into each fixed claw 24 sequentially.

The temperature sensor unit 5 is connected to the unit battery 2
Can be easily arranged by disposing it on the upper surface 20 of the battery case, and since the temperature detecting hole 21 is formed and the metal body 22 for heat transfer is inserted and arranged, the electrode plate having the highest temperature can be obtained. The temperature at the upper end of the group 17 can be detected with a very small heat transfer loss, and the bottom wall 21a of the temperature detection hole 21 is formed to be thinner than the peripheral wall.
Since the heat transfer sheet 23 is interposed between the temperature sensor 2 and the temperature sensor 6, the heat transfer loss can be further reduced, and the abnormal temperature of the battery can be appropriately detected.

Further, instead of inserting the metal body 22 in the temperature detecting hole 21, as shown in FIG.
Even if the temperature sensor 6 is arranged at the bottom of the battery, the abnormal temperature of the battery can be appropriately detected with little heat transfer loss.

Further, the temperature sensor 6 is disposed between the unit cells 3 adjacent to each other of the unit cell 2 so that one temperature sensor 6 detects an abnormal temperature of the unit cells 3. In this case, the number of the temperature sensor units 5 can be further reduced, and the cost can be reduced.

In the above-described embodiment, the temperature sensor unit 5 is disposed one or more times in the direction in which the unit batteries 2 are disposed. However, the arrangement structure of the temperature sensor 6 in FIG. 2 can be applied in a straight line along the parallel direction or the longitudinal direction. In such a case, a temperature detection hole 21 reaching the upper end of the electrode group 17 of each unit cell 3 is provided. A metal body 22 for heat transfer is inserted into the metal body 21, the temperature sensor 6 is arranged in contact with the upper surface of the metal body 22, and the bottom wall 21 a of the temperature detection hole 21 is made thinner than the peripheral wall. A heat transfer sheet 23 having good adhesiveness is interposed between the temperature sensor 6 and the temperature sensor 6, and the temperature detection hole
By providing the fixed claws 24 for holding the temperature sensor 6 between the metal member 22 and the side of the first side, the above-described effects can be obtained. The temperature sensor 6 shown in FIG.
The same applies to the arrangement structure.

[0040]

According to the battery pack abnormal temperature detecting device of the first invention, as is apparent from the above description, a temperature sensor unit formed by connecting a required number of temperature sensors at appropriate intervals is provided between unit batteries. And the temperature sensors are fixed in place on the side of each cell in order, minimizing the heat transfer distance to the electrode plates of the cell by detecting the temperature on the side of each cell The heat transfer loss is smaller than when the unit battery is disposed on the upper surface of the battery case, and the abnormal temperature of the battery can be appropriately detected.

Further, when the temperature sensor unit has a length that makes at least one reciprocation along the unit cell disposing direction of the unit cells, the number of the temperature sensor units is at least half or less of the number of each unit cell, Further, when a temperature sensor unit is disposed between two unit batteries and one temperature sensor detects abnormal temperatures of the unit cells on both sides thereof, the temperature sensor unit can be reduced to about half the temperature. And the number of mounting steps can be reduced, and the cost can be reduced.

According to the apparatus for detecting abnormal temperature of a battery pack according to the second aspect of the present invention, the temperature sensor units are arranged in the direction in which the unit cells are arranged, and the temperature sensors are sequentially fixed to the temperature detection locations of the cells. In addition, since the temperature sensor unit has a length that makes at least one reciprocation in the arrangement direction of the unit batteries, the number of the temperature sensor units is substantially half the number of the unit cells in the unit battery, and the number and the mounting of the temperature sensor units are small. The number of steps can be reduced and the cost can be reduced. In particular, when the battery pack is composed of a large number of unit batteries, the cost can be significantly reduced.

Further, when a temperature detection hole reaching the upper end of the electrode plate group of each cell is provided on the upper surface of the battery case of the unit cell and the wall thickness of the bottom wall of the temperature detection hole is made thinner than the peripheral wall, the temperature sensor unit Can be easily arranged by arranging it on the upper surface of the battery case of the unit battery, the heat transfer loss can be further reduced, the abnormal temperature of the battery can be appropriately detected, and the temperature detecting hole is When a metal body for heat transfer is inserted and arranged, a temperature sensor is arranged in contact with the upper surface of the metal body, and more preferably a good heat transfer sheet with good adhesion is interposed between the metal body and the temperature sensor. The temperature sensor unit can be easily installed along the upper surface of the battery case, and can detect abnormal temperature of the battery properly with little heat transfer loss via the metal body. A temperature sensor is located on the side of the temperature detection hole. The provision of fixing claw for clamping between the metal body, only sequentially inserting the temperature sensor in each fixing claw,
The temperature sensor unit can be easily arranged with good workability.

Further, even if a temperature sensor is arranged at the bottom of the temperature detection hole, the abnormal temperature of the battery can be properly detected with little heat transfer loss.

According to the abnormal battery temperature detecting device of the third invention, the temperature sensor unit is disposed in the longitudinal direction or the arrangement direction of the unit cells, and the electrode group of each unit cell is placed on the upper surface of the battery case of the unit cells. A temperature detection hole is provided near the upper end of the metal body, a metal body for heat transfer is inserted into the temperature detection hole, and the temperature sensor is placed in contact with the upper surface of this metal body. In addition, the abnormal temperature of the battery can be appropriately detected in a state where the heat transfer loss is small via the metal body, while facilitating the disposing work.

[Brief description of the drawings]

FIG. 1 is an overall plan view of a first embodiment of an abnormal temperature detecting device for a battery pack according to the present invention.

FIG. 2 is a front view of the embodiment.

FIG. 3 is a partial vertical sectional side view of the embodiment.

FIG. 4 is an enlarged detail view of a portion A in FIG. 1;

FIG. 5 is a perspective view of a temperature sensor unit.

FIG. 6 is a cutaway perspective view showing a configuration of a temperature sensor portion of the temperature sensor unit.

FIG. 7 is an overall perspective view of a second embodiment of a battery pack abnormal temperature detecting apparatus according to the present invention.

FIG. 8 is a longitudinal sectional view showing an example of an arrangement state of the temperature sensor in the embodiment.

FIG. 9 is a vertical cross-sectional view showing another example of the arrangement state of the temperature sensor in the embodiment.

FIG. 10 is a perspective view showing an example of an arrangement state of a temperature sensor unit in a conventional battery pack abnormal temperature detecting device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 assembled battery 2 unit battery 3 cell 4 cooling medium passage 5 temperature sensor unit 6 temperature sensor 13 cooling avoidance projection 15 sensor arrangement groove 20 battery case upper surface 21 temperature detection hole 21 a bottom wall 22 metal body 23 heat transfer sheet 24 fixing claw

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) // H01M 2/10 H01M 2/10 K (72) Inventor Isao Watanabe 555 Sakaijuku, Kosai-shi, Shizuoka, Panasonic F-term in EV Energy Co., Ltd. (reference) 2F056 CL07 5H020 AA01 AS06 KK11 KK13 MM34 5H030 AA06 AS06 AS20 FF22 5H031 AA09 CC05 KK01 KK08

Claims (18)

[Claims] 1. A battery assembly in which a plurality of unit cells in a rectangular parallelepiped shape in which a plurality of unit cells are arranged in series are arranged in parallel in a direction orthogonal to the arrangement direction of the unit cells, and a required number of temperature sensors are appropriately used. An abnormal temperature detecting device for an assembled battery, wherein a temperature sensor unit connected at intervals is disposed between unit cells, and each temperature sensor is sequentially fixed at an appropriate position on a side surface of each cell. 2. The abnormal temperature detecting device for an assembled battery according to claim 1, wherein the temperature sensor unit has a length that makes at least one reciprocation along the unit battery disposing direction of the unit battery. 3. The temperature sensor unit is disposed between two unit batteries, and one temperature sensor detects abnormal temperatures of the unit cells on both sides thereof. 3. The abnormal battery temperature detecting device according to claim 1 or 2. 4. Each temperature sensor of the temperature sensor unit,
2. The abnormal temperature detecting device for an assembled battery according to claim 1, wherein the abnormal temperature detecting device is fixed on a side surface of the unit battery near a maximum temperature region of the unit cell. 5. The abnormal temperature detecting device for an assembled battery according to claim 4, wherein the wall thickness of the temperature sensor unit on the side surface of the unit battery is reduced. 6. A cooling avoidance projection for forming a cooling medium passage between the unit cells and guiding the cooling medium so as to flow avoiding the temperature sensor in a lower part or an upper part and a lower part of a place where the temperature sensor is arranged between the unit cells. The abnormal temperature detecting device for an assembled battery according to claim 1, further comprising: 7. A unit battery comprising a plurality of unit cells arranged in series is arranged in parallel in a direction which is larger than the number of unit cells in each unit cell and which is orthogonal to the unit cell array direction. In the assembled battery, a temperature sensor unit formed by connecting a required number of temperature sensors at appropriate intervals is arranged in the arrangement direction of the unit cells, and each temperature sensor is sequentially fixed to a temperature detecting portion of each cell, and An abnormal temperature detecting device for an assembled battery, wherein the sensor unit has a length that makes at least one reciprocation in the arrangement direction of the unit batteries. 8. The abnormal temperature detecting device for an assembled battery according to claim 7, wherein a temperature detecting hole reaching near the upper end of the electrode plate group of each unit cell is provided on the upper surface of the battery case of the unit cell. 9. The battery pack abnormal temperature detecting device according to claim 8, wherein the wall thickness of the bottom wall of the temperature detecting hole is thinner than the peripheral wall. 10. The battery pack according to claim 8, wherein a metal body for heat transfer is inserted and arranged in the temperature detection hole, and a temperature sensor is arranged in contact with an upper surface of the metal body. Temperature detector. 11. A heat transfer sheet having good adhesion between a metal body and a temperature sensor.
An abnormal temperature detection device for an assembled battery according to the above. 12. The assembled battery according to claim 10, wherein a fixing claw for holding the temperature sensor between the unit and the metal body is provided on a side of the temperature detecting hole on the upper surface of the battery case of the unit battery. Abnormal temperature detector. 13. The abnormal temperature detecting device for an assembled battery according to claim 8, wherein a temperature sensor is disposed at a bottom of the temperature detecting hole. 14. A temperature sensor is disposed between unit cells adjacent to each other in a unit cell, and one temperature sensor detects abnormal temperatures of both unit cells. An apparatus for detecting abnormal temperature of an assembled battery according to any one of claims 13 to 13. 15. A battery pack in which unit cells each having a plurality of unit cells arranged in series are arranged in parallel in a direction orthogonal to the arrangement direction of the unit cells, and a required number of temperature sensors are arranged at appropriate intervals. The connected temperature sensor unit is arranged in the longitudinal direction or the arrangement direction of the unit batteries, and on the upper surface of the battery case of the unit batteries,
A temperature detection hole reaching the upper end of the electrode plate group of each cell is provided, a metal body for heat transfer is inserted and arranged in the temperature detection hole, and a temperature sensor is arranged in contact with an upper surface of the metal body. Abnormal battery temperature detector. 16. The abnormal temperature detecting device for an assembled battery according to claim 15, wherein a wall thickness of a bottom wall of the temperature detecting hole is smaller than a peripheral wall. 17. A heat transfer sheet having good adhesion between a metal body and a temperature sensor.
An abnormal temperature detection device for an assembled battery according to the above. 18. The battery pack according to claim 15, wherein a fixing claw for holding the temperature sensor between the unit and the metal body is provided on a side of the temperature detection hole on the upper surface of the battery case of the unit battery. Temperature detector.