JP2016031946A - Power storage module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage module capable of detecting temperature abnormality at an earlier stage and exactly measuring temperature of power storage cells.SOLUTION: Disclosed is a power storage module 100 in which a plurality of power storage cells 10 are laminated. This module includes a temperature sensor 50 provided between power storage cells 10 adjacent to each other. The temperature sensor 50 is in contact with one power storage cell 10 of the power storage cells 10 adjacent to each other and separated from the other power storage cell 10 of the power storage cells 10 adjacent to each other.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a power storage module.

  In recent years, power storage having high energy density and high output characteristics in various fields such as automobiles, large vehicles for transportation, automatic guided vehicles (AGV), ships, airplanes, wind power generators, instantaneous power failure devices, etc. As cells, lithium ion secondary batteries, electric double layer capacitors, lithium ion capacitors, and the like have attracted attention. The plurality of power storage cells are connected in series or in parallel by a bus bar and used as a power storage module.

  The above storage cell may be deteriorated in characteristics of the storage cell due to the influence of temperature. Therefore, for example, when the temperature of the power storage cell is measured and the measured temperature becomes high, it is detected that the temperature is abnormal, and the characteristic deterioration of the power storage module is suppressed.

  Patent Document 1 discloses a configuration in which a sensor component of a thermistor (temperature sensor) is mounted on an insulating case of a bus bar module. Specifically, Patent Document 1 discloses a configuration in which an insertion hole is formed in a case, a thermistor is fitted into the insertion hole, and the thermistor is in contact with a surface on which a terminal (electrode) of the storage cell is provided. Yes. And it is disclosed that the wiring of the sensor component is provided so as to be along the insulating case of the bus bar module, thereby suppressing the interference of the wiring with the outside.

  In Patent Document 2, by providing a temperature sensor disposed in contact with both unit cells between a pair of adjacent unit cells, the number of temperature sensors and the number of lead wires wired to the temperature sensor are reduced. It has been disclosed to reduce costs by reducing the number of points and assembly man-hours. In the power storage module described in Patent Document 2, the temperature sensor is attached to the sensor mounting column of the case.

Japanese Patent No. 5345913 JP 2004-362957 A

  However, since the power storage module described in Patent Document 1 has a configuration in which the temperature sensor is in contact with the surface on which the terminals of the power storage cell are provided, it is difficult to measure the temperature between the power storage cell and the power storage cell. In the power storage module, the temperature between the power storage cells tends to be high. Therefore, in the power storage module described in Patent Document 1, the timing for detecting the temperature abnormality is late, and the characteristics of the power storage cell may deteriorate due to temperature.

  Further, in the power storage module described in Patent Document 2, since the temperature sensor detects the temperature of the power storage cells on both sides of the temperature sensor at once, information (data) detected by the temperature sensor is confused (in the temperature sensor). There is a case where it is impossible to accurately determine the temperature of one power storage cell). For this reason, it is difficult to remove only the deteriorated power storage cell, and it may be judged whether the power storage cell has not deteriorated.

  One of the objects according to some aspects of the present invention is to provide a power storage module that can quickly detect a temperature abnormality and can accurately measure the temperature of a power storage cell.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following aspects or application examples.

[Application Example 1]
One aspect of the power storage module according to the present invention is:
A power storage module in which a plurality of power storage cells are stacked,
A temperature sensor provided between the adjacent storage cells;
Including
The temperature sensor is in contact with one of the adjacent storage cells and is separated from the other storage cell of the adjacent storage cells.

  In such a power storage module, the temperature sensor is provided between the adjacent power storage cells, so that a temperature abnormality can be detected quickly. Furthermore, in such a power storage module, one power storage cell of the adjacent power storage cell (the first power storage cell) is connected to one power storage cell of the adjacent power storage cell and separated from the other power storage cell of the adjacent power storage cell. The temperature of the cell) can be accurately measured. As described above, in such a power storage module, a temperature abnormality can be detected quickly, and the temperature of the power storage cell can be accurately measured.

[Application Example 2]
In application example 1,
The temperature sensor may have a sheet shape.

  In such a power storage module, the stacking direction of the plurality of power storage cells can be reduced.

[Application Example 3]
In application example 1 or 2,
A first member and a second member provided between the storage cells adjacent to each other and spaced apart from each other;
The temperature sensor is inserted between the first member and the second member,
The temperature sensor is
A first portion of the first member located in a first direction;
A second portion of the second member located in a second direction opposite to the first direction;
Have
The second member is located in a third direction perpendicular to the first direction and the second direction, rather than the first member,
Seen from the third direction,
The first part and the second member overlap,
The second part and the first member may overlap.

  In such a power storage module, for example, even when a force in the insertion direction is applied to the temperature sensor due to an impact from the outside, at least one of the first member and the second member serves as a stopper to prevent the temperature sensor from coming off. be able to. Therefore, in such a power storage module, the temperature of the power storage cell can be accurately measured.

[Application Example 4]
In any one of Application Examples 1 to 3,
An urging unit that urges the temperature sensor to one of the storage cells adjacent to the storage cell may be included.

  In such a power storage module, the temperature sensor can more reliably come into contact with the first power storage cell, and the position of the contact portion of the temperature sensor with the first power storage cell can be suppressed from shifting.

[Application Example 5]
In application example 4,
The urging portion may be a leaf spring.

  In such a power storage module, the temperature sensor can more reliably come into contact with the first power storage cell, and the position of the contact portion of the temperature sensor with the first power storage cell can be suppressed from shifting.

[Application Example 6]
In application example 3,
Including an insulating separator provided between the storage cells adjacent to each other;
The first member, the second member, and the separator may be integrally formed.

  In such a power storage module, an increase in the number of components can be suppressed by providing the first member and the second member, and an increase in cost can be prevented.

[Application Example 7]
In Application Example 6,
The separator may have an opening on a surface in contact with the storage cell.

  In such a power storage module, the opening can be used as a vent hole, and the heat dissipation of the power storage cell can be improved.

[Application Example 8]
In any one of Application Examples 1 to 7,
The electricity storage cell may be a square type or a laminate type.

  In such a power storage module, the stacking direction of the plurality of power storage cells can be reduced.

[Application Example 9]
In any one of Application Examples 1 to 8,
The storage cell may be a lithium ion capacitor.

  In such a power storage module, the power storage cell can have a larger energy density and capacitance than an electric double layer capacitor. Furthermore, the storage cell is less likely to cause thermal runaway than the lithium ion secondary battery and can have high safety.

The perspective view which shows typically the electrical storage module which concerns on this embodiment. The front view which shows typically the electrical storage module which concerns on this embodiment. The side view which shows typically the electrical storage module which concerns on this embodiment. Sectional drawing which shows typically the electrical storage module which concerns on this embodiment. Sectional drawing which shows typically the electrical storage module which concerns on this embodiment. Sectional drawing which shows typically the electrical storage module which concerns on this embodiment. The perspective view which shows typically the electrical storage module which concerns on this embodiment. The front view which shows typically the electrical storage module which concerns on this embodiment. The side view which shows typically the electrical storage module which concerns on this embodiment. Sectional drawing which shows typically the electrical storage module which concerns on this embodiment. The top view which shows typically the temperature sensor, 1st member, and 2nd member of the electrical storage module which concern on this embodiment.

  Preferred embodiments of the present invention will be described below with reference to the drawings. It should be understood that the present invention is not limited only to the embodiments described below, and includes various modified examples that are implemented without departing from the scope of the present invention.

  The power storage module according to the present embodiment will be described with reference to the drawings. FIG. 1 is a perspective view schematically showing a power storage module 100 according to the present embodiment. FIG. 2 is a front view schematically showing the power storage module 100 according to the present embodiment. FIG. 3 is a side view schematically showing the power storage module 100 according to the present embodiment. 4-6 is sectional drawing which shows typically the electrical storage module 100 which concerns on this embodiment. FIG. 7 is a perspective view schematically showing the power storage module 100 according to the present embodiment. FIG. 8 is a front view schematically showing the power storage module 100 according to the present embodiment. FIG. 9 is a side view schematically showing the power storage module 100 according to the present embodiment. FIG. 10 is a cross-sectional view schematically showing the power storage module 100 according to this embodiment.

  4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is an enlarged view of a region V in FIG. FIG. 6 is an enlarged view of a region VI in FIG. 10 is a cross-sectional view taken along line XX of FIG. For convenience, the storage cell 10 is omitted in FIGS. 1 to 10 show the X axis, the Y axis, and the Z axis as three axes orthogonal to each other. In the following, the −Y axis direction is the first direction, the + Y axis direction is the second direction, and the −Z axis direction is the third direction.

  As shown in FIGS. 1 to 10, the power storage module 100 includes a power storage cell 10, a separator 20, a first member 30, a second member 32, a third member 34, a fourth member 36, and an urging force. Part 40 and temperature sensor 50.

  A plurality of storage cells 10 are provided. The number of power storage cells 10 is not particularly limited, but in the illustrated example, two power storage cells 10 are provided (first power storage cell 10a and second power storage cell 10b). The plurality of power storage cells 10 are stacked. In the illustrated example, the plurality of power storage cells 10 are stacked in the Y-axis direction. The 1st electrical storage cell 10a is located in the -Y-axis direction rather than the 2nd electrical storage cell 10b.

  The storage cell 10 is, for example, a lithium ion capacitor, a secondary battery, or an electric double layer capacitor. Below, the electrical storage cell 10 is demonstrated as a lithium ion capacitor. A lithium ion capacitor is a capacitor whose energy density is improved by intercalating lithium ions into a negative electrode material using a carbon-based material that can store lithium ions as the negative electrode material while using the principle of an electric double layer capacitor. It is.

The storage cell 10 includes an exterior body 12, a sealing plate 14, a positive electrode terminal 16, and a negative electrode terminal 18.

  The exterior body 12 accommodates an electrode body and an electrolytic solution (not shown). The form of the electrode body may be a wound type in which a sheet-like positive electrode, a negative electrode, a lithium electrode, and a separator are stacked to form a laminated sheet, and the laminated sheet is wound. A stacked type in which a plurality of layers are stacked may be used. As the positive electrode active material layer of the positive electrode, for example, activated carbon or a polyacene-based material (PAS) that is a heat-treated product of an aromatic condensation polymer is used. As the negative electrode active material layer of the negative electrode, for example, graphite (graphite) or non-graphitizable carbon (hard carbon) is used. The lithium electrode can be dissolved in the electrolytic solution to become lithium ions, and the lithium ions can be electrochemically doped into the negative electrode active material layer of the negative electrode through the electrolytic solution (also referred to as “pre-doping”). it can. As a result, the potential of the negative electrode can be lowered, and high capacity and high energy density can be achieved.

  The shape of the exterior body 12 is not particularly limited as long as the electrode body and the electrolytic solution can be accommodated. In the illustrated example, the exterior body 12 has a thickness (size in the Y-axis direction) and a width (X It has a substantially box shape smaller than the size in the axial direction) and the height (size in the Z-axis direction). That is, the electrical storage cell 10 is rectangular. The exterior body 12 has an opening upward (in the + Z-axis direction). The material of the exterior body 12 is, for example, aluminum, stainless steel, or iron.

  The sealing plate 14 is provided in the opening of the exterior body 12. The sealing plate 14 may be joined to the exterior body 12 by welding. The shape of the sealing board 14 will not be specifically limited if the opening of the exterior body 12 can be sealed. As the sealing plate 14, for example, a metal plate made of aluminum, stainless steel, iron or the like (in the + Z axis direction) provided with a gasket made of polyethylene (PE), polypropylene (PP) or the like is used.

  For example, the portion where the negative electrode terminal 18 of the sealing plate 14 is provided has a structure in which a gasket is insert-molded with respect to the metal plate of the sealing plate 14. The negative electrode terminal 18 is electrically insulated. Therefore, the positive electrode terminal 16 and the negative electrode terminal 18 can maintain insulation.

  As shown in FIG. 1, the sealing plate 14 is provided with a safety valve 15. The safety valve 15 is opened when the pressure in the space (sealed space) defined by the exterior body 12 and the sealing plate 14 rises above a predetermined value, and the gas in the sealed space can be released to the outside. Thereby, it can suppress that the pressure of sealed space raises.

  The positive terminal 16 and the negative terminal 18 are provided so as to protrude from the sealing plate 14. The positive electrode terminal 16 is electrically connected to the positive electrode of the electrode body accommodated in the exterior body 12. The negative electrode terminal 18 is electrically connected to the negative electrode of the electrode body accommodated in the exterior body 12. The material of the positive electrode terminal 16 is, for example, aluminum. The material of the negative electrode terminal 18 is, for example, copper or nickel. In the example illustrated in FIG. 2, the negative electrode terminal 18 is located in the + Z-axis direction with respect to the positive electrode terminal 16. For example, by providing a step in the gasket of the sealing plate 14 (by changing the size in the Z-axis direction), the negative electrode terminal 18 can be arranged in the + Z-axis direction relative to the positive electrode terminal 16. Thereby, the positive electrode terminal 16 and the negative electrode terminal 18 can be distinguished clearly, it can suppress that an operator mistakes the positive electrode terminal 16 and the negative electrode terminal 18, and a misconnection can be prevented.

  The plurality of power storage cells 10 may be connected in series. By connecting the positive electrode terminal 16 of one storage cell 10 of the adjacent storage cell 10 and the negative electrode terminal 18 of the other storage cell 10 by a bus bar (not shown), a plurality of storage cells 10 are connected in series. Can be connected. In this case, the voltage of the power storage module 100 can be increased.

  The plurality of power storage cells 10 may be connected in parallel. The positive electrode terminal 16 of one storage cell 10 of the adjacent storage cell 10 and the positive electrode terminal 16 of the other storage cell 10 are connected by a bus bar, and the negative electrode terminal 18 of one storage cell 10 and the other storage cell 10 are connected. The plurality of storage cells 10 can be connected in parallel by connecting the negative electrode terminal 18 to each other by a bus bar. In this case, the current of the power storage module 100 can be increased.

  The shape of the bus bar that connects the plurality of storage cells 10 in series or in parallel is not particularly limited, but a shape that does not increase resistance is desirable, such as a plate shape or a shape having a curved portion. In the illustrated example, the negative electrode terminal 18 is located in the + Z-axis direction with respect to the positive electrode terminal 16, and thus a bus bar corresponding to such terminals 16 and 18 is used. The material of the bus bar is, for example, aluminum, copper, iron, stainless steel, or an alloy thereof (including a clad material obtained by bonding aluminum and copper or the like).

  The separator 20 is provided between the adjacent power storage cells 10. The separator 20 can arrange | position the adjacent electrical storage cell 10 isolated at a fixed space | interval. The interval between the adjacent storage cells 10 is, for example, 1 mm or more and 20 mm or less, and is appropriately determined depending on the capacity or size of the storage cell 10. The separator 20 can fix the storage cell 10.

  The separator 20 is insulative. Specifically, the material of the separator 20 is an epoxy resin, an ABS (acrylonitrile butadiene styrene) resin, a silicone resin, or ceramics.

  As shown in FIG. 7, the separator 20 is provided between the insulating portion 22 provided between adjacent storage cells 10 and both sides of the insulating portion 22 (in the illustrated example, + X axis direction and −X axis direction −). Side 24.

  The insulating portion 22 of the separator 20 has a surface 22 a that contacts the storage cell 10. The separator 20 has an opening 23 on the surface 22a. In the illustrated example, the shape of the opening 23 is a quadrangle, but the shape is not particularly limited. Through the opening 23, one of the adjacent storage cells 10 and the other storage cell 10 can be insulated from each other by the atmosphere. In the illustrated example, the insulating part 22 extends in the X-axis direction. The opening 23 enables air cooling, and the adjacent power storage cells 10 can be insulated while improving the heat dissipation of the power storage cells 10.

  Although not shown, the separator 20 does not have the opening 23, the insulating portion 22 includes a surface having an uneven shape, and the storage cell 10 may be in contact with the surface having the uneven shape. Thereby, since a space can be formed between the electricity storage cell 10 and the insulating portion 22, the adjacent electricity storage cells 10 can be insulated while improving the heat dissipation of the electricity storage cell 10.

  The separator 20 has an opening 25 in the side portion 24. In the illustrated example, the shape of the opening 25 is a quadrangle, but the shape is not particularly limited. The opening 25 communicates with the opening 23.

  As shown in FIGS. 4 and 5, the first member 30, the second member 32, the third member 34, and the fourth member 36 are located between adjacent storage cells 10 (in the illustrated example, the first storage cell 10 a And between the second storage cells 10b). The members 30, 32, 34, and 36 are alternately arranged so as to be separated from each other. The material of the members 30, 32, 34, 36 is the same as that of the separator 20, for example. The members 30, 32, 34, 36 and the separator 20 may be integrally formed. By forming the members 30, 32, 34, and 36 and the separator 20 integrally, the manufacturing cost can be reduced.

  For example, the first member 30 and the third member 34 overlap each other when viewed from the Z-axis direction. For example, the second member 32 and the fourth member 36 overlap each other when viewed from the Z-axis direction. As illustrated in FIG. 5, the members 30 and 34 are located closer to the second power storage cell 10 b than the members 32 and 36 (in the illustrated example, to the + Y axis direction side). The members 32 and 36 are located closer to the first storage cell 30a than the members 30 and 34 (in the illustrated example, on the −Y axis direction side). The members 30 and 34 are in contact with the temperature sensor 50, for example. For example, the members 32 and 36 are in contact with the first power storage cell 10a. In the example shown in FIG. 5, the shapes of the members 30, 32, 34 and 36 are rectangles having long sides parallel to the Z axis. The shapes and sizes of the members 30, 32, 34, and 36 may be the same as each other. The distance between the first member 30 and the third member 34 and the distance between the second member 32 and the fourth member 36 may be the same.

  The first member 30, the second member 32, the third member 34, and the fourth member 36 are arranged from the root 50 a side to the tip 50 b side of the temperature sensor 50 (see FIG. 4), the first member 30, the second member. 32, the third member 34, and the fourth member 36 are arranged in this order. In the illustrated example, the second member 32 is located in the −Z-axis direction with respect to the first member 30. The third member 34 is located more in the −Z axis direction than the second member 32. The fourth member 36 is located more in the −Z axis direction than the third member 34. As viewed from the Z-axis direction, a part of the first member 30, a part of the second member 32, a part of the third member 34, and a part of the fourth member 36, for example, overlap each other.

  As shown in FIGS. 4 and 6, the urging unit 40 urges the temperature sensor 50 toward the first power storage cell 10a. The urging unit 40 is, for example, a leaf spring. Although the shape of the urging | biasing part 40 is not specifically limited, For example, they are S shape and C shape with a curved part. The material of the urging unit 40 is the same as that of the separator 20, for example. The urging unit 40 and the separator 20 may be integrally formed.

  The temperature sensor 50 is provided between the adjacent storage cells 10. The temperature sensor 50 is inserted between the first member 30 and the second member 32. In the illustrated example, the temperature sensor 50 is inserted between the first member 30 and the second member 32, between the second member 32 and the third member 34, and between the third member and the fourth member 36. Has been. As illustrated in FIG. 5, the temperature sensor 50 includes a first portion 51, a second portion 52, a third portion 53, a fourth portion 54, and a fifth portion 55.

  The first portion 51 of the temperature sensor 50 is a portion located in the −Y axis direction of the first member 30. The second portion 52 is a portion located on the + Y axis direction side of the second member 32. The third portion 53 is a portion located in the −Y axis direction of the third member 34. The fourth portion 54 is a portion located in the + Y axis direction of the fourth member 36. That is, as viewed from the Y-axis direction, the first portion 51 overlaps with the first member 30, the second portion 52 overlaps with the second member 32, the third portion 53 overlaps with the third member 34, and the fourth portion 54 It overlaps the four members 36. In the illustrated example, the first portion 51 and the second portion 52 extend in the Z-axis direction.

  The fifth portion 55 of the temperature sensor 50 is a portion that connects the first portion 51 and the second portion 52, a portion that connects the second portion 52 and the third portion 53, and the third portion 53 and the second portion 52. This is a part connecting the four parts 54. The fifth portion 55 has a bent or curved shape.

Here, FIG. 11 is a schematic view (plan view) of the power storage module 100 as viewed from the −Z-axis direction, and is a view in which members other than the members 30 and 32 and the portions 51 and 52 of the temperature sensor 50 are omitted. As shown in FIG. 11, the first portion 51 and the second member 32 of the temperature sensor 50 overlap each other when viewed from the −Z-axis direction, and the second portion 52 and the first member 30 of the temperature sensor 50 are overlapping. As seen from the −Z-axis direction, the first member 30 further includes the fourth portion 5 of the temperature sensor 50.
4, the second member 32 overlaps the third portion 53 of the temperature sensor 50. Similarly, the third member 34 overlaps the portions 52 and 54 of the temperature sensor 50, and the fourth member 36 overlaps the portions 51 and 53 of the temperature sensor 50 as viewed from the −Z axis direction.

  The temperature sensor 50 meanders as shown in FIG. The temperature sensor 50 has a sheet-like shape. That is, the temperature sensor 50 is not circular or elliptical, but has a thin shape in the stacking direction of the plurality of storage cells 10 (Y-axis direction in the illustrated example).

  As shown in FIG. 6, the temperature sensor 50 has a sixth portion 56. In the illustrated example, the sixth portion 56 is located more in the −Z-axis direction than the fourth portion 54. The sixth portion 56 is a portion in contact with the urging portion 40. In the sixth portion 56, the temperature sensor 50 is in contact with the first storage cell 10a. The temperature sensor 50 is separated from the second storage cell 10b. The temperature sensor 50 may measure (detect) the temperature of the first storage cell 10 a in the sixth portion 56. Specifically, the temperature sensor 50 is in contact with the surface 11 of the first storage cell 10a facing the second storage cell 10b. The temperature sensor 50 is in surface contact with the surface 11 of the first storage cell 10a. The surface 11 is the surface having the largest area among the surfaces constituting the first power storage cell 10 a, and the plurality of power storage cells 10 are stacked in the direction perpendicular to the surface 11. The temperature sensor 50 is separated from the second storage cell 10b.

  The sixth portion 56 of the temperature sensor 50 may be fixed to the first power storage cell 10a with a heat resistant tape (not shown). The material of the heat resistant tape is, for example, polyimide.

  The temperature sensor 50 is inserted between the members 30 and 32, between the members 32 and 34, and between the members 34 and 36, for example, from the −Z-axis direction. Accordingly, the −Z-axis direction is the insertion direction of the temperature sensor 50.

  The temperature sensor 50 is, for example, a thermistor. A wiring 57 (see FIG. 7) is connected to the base of the temperature sensor 50 (in the illustrated example, the end on the + Z-axis direction side). The material of the wiring 57 is not particularly limited as long as it is conductive. For example, the wiring 57 is inserted into a wiring fixing portion 58 formed integrally with the separator 20. The wiring fixing portion 58 is not located between the adjacent storage cells 10. By inserting the wiring 57 into the wiring fixing portion 58, it is possible to suppress the wiring 57 from interfering with other members and from being disconnected, or coming into contact with the positive electrode terminal 16 or the negative electrode terminal 18 to cause a short circuit. The wiring 57 is connected to an external device (not shown). For example, the external device can determine the degree of deterioration of the storage cell 10 based on the temperature measured by the temperature sensor 50.

  Although not shown, on the + Y-axis direction side of the second storage cell 10b, a separator 20 in which members 30, 32, 34, 36, an urging portion 40, and the like are integrally formed is provided. , 32, etc., the temperature sensor 50 and the second storage cell 10b are in contact with each other.

Further, in the above example, the power storage cell 10 has a rectangular shape, but the power storage cell according to the present invention may be appropriately adopted such as a cylindrical shape or a laminate type. However, in view of reducing the stacking direction of the plurality of power storage cells and increasing the energy density, a rectangular shape or a laminate type is preferable. Compared to the cylindrical type, the square type and the laminated type are less likely to cause a dead space when laminated. Therefore, it is possible to measure high energy density. On the other hand, since the cylindrical shape has a circular shape, it has a dead space between adjacent storage cells, and it is difficult to achieve high energy density and compactness. Here, the laminate type is a form in which the electrode body and the electrolytic solution are accommodated by two laminated films. That is,
In this form, a laminate film is used as the outer package. As the laminate film, for example, a metal foil such as aluminum foil or copper foil sandwiched between synthetic resins such as polypropylene or nylon is used.

  In the above example, the power storage module 100 includes the members 30, 32, 34, and 36. However, if the power storage module according to the present invention includes the members 30 and 32, the members 34 and 36 are provided. May not be present. The power storage module according to the present invention may have a fifth member having the same shape as the third member 34 in the −Z-axis direction of the third member 34, and the fourth member 36 in the −Z-axis direction. The fourth member 36 may have a sixth member having the same shape. In this case, the sixth member is located in the −Z-axis direction with respect to the fifth member. As described above, as long as the members 30 and 32 are included, the number of members (for example, members having the same shape as the members 30 and 32) included in the power storage module according to the present invention is not particularly limited.

  The power storage module 100 has the following features, for example.

  The power storage module 100 includes a temperature sensor 50 provided between adjacent power storage cells. The temperature sensor 50 is in contact with one first power storage cell 10a of the adjacent power storage cells 10, and the adjacent power storage cells 10 Is separated from the other storage cell 10b. In the power storage module, for example, the temperature between the power storage cells tends to be high. Therefore, in the power storage module 100, since the temperature sensor 50 is provided between the adjacent power storage cells 10, it is possible to quickly detect a temperature abnormality. Furthermore, the temperature sensor 50 is in contact with one first power storage cell 10a of the adjacent power storage cells 10 and is separated from the other second power storage cell 10b. For example, when the temperature sensor is in contact with the first energy storage cell and the second energy storage cell, whether the temperature detected by the temperature sensor is due to the first energy storage cell or the second energy storage cell, In some cases, it may be determined that a storage cell that has not deteriorated can be separated and deteriorated, and for example, it may be difficult to remove only the storage cell that has deteriorated. In the power storage module 100, such a problem can be avoided and the temperature of the first power storage cell 10a can be accurately measured, so that the degree of deterioration of the first power storage cell 10a can be accurately known. . As described above, in such a power storage module, a temperature abnormality can be detected quickly, and the temperature of the power storage cell can be accurately measured.

  In the power storage module 100, the temperature sensor 50 has a sheet shape. Specifically, the temperature sensor 50 has a thin sheet shape in the stacking direction of the plurality of power storage cells 10. Therefore, in the power storage module 100, the stacking direction of the plurality of power storage cells 10 can be reduced, and high energy density can be achieved.

  The power storage module 100 includes a first member 30 and a second member 32 that are provided between adjacent power storage cells 10 and are separated from each other, and the temperature sensor 50 is between the first member 30 and the second member 32. The temperature sensor 50 is inserted into the first portion 51 of the first member 30 in the first direction (−Y-axis direction) and the second direction of the second member 32 opposite to the first direction ( 2nd part 52 located in + Y-axis direction), and the 2nd member 32 is the 3rd direction (-Z-axis direction) orthogonal to the 1st direction and the 2nd direction rather than the 1st member 30. Positioned and viewed from the third direction, the first portion 51 and the second member 32 overlap, and the second portion 52 and the first member 30 overlap. Therefore, in the power storage module 100, even if a force in the Z-axis direction is applied to the temperature sensor 50 due to an external impact, for example, at least one of the first member 30 and the second member 32 serves as a stopper, and the temperature sensor 50 It is possible to suppress detachment. Therefore, in the power storage module 100, the temperature of the power storage cell 10 can be accurately measured. For example, when the power storage module is mounted on a moving body or the like, the temperature of the power storage cell may not be accurately measured if the temperature sensor is removed due to vibration of the moving body.

  In the illustrated example, even if a force in the Z-axis direction is applied to the temperature sensor 50 due to an impact from the outside, for example, the members 30, 32, 34, and 36 serve as a stopper to prevent the temperature sensor 50 from coming off. Can do.

  The power storage module 100 includes a biasing unit 40 that biases the temperature sensor 50 to one of the first power storage cells 10 a of the adjacent power storage cells 10. Therefore, in the power storage module 100, the temperature sensor 50 can contact the first power storage cell 10a more reliably, and even if a force is applied to the temperature sensor 50 from the outside, the first power storage cell 10a of the temperature sensor 50 The position of the contact portion (sixth portion) 56 can be prevented from shifting. That is, the earthquake resistance of the power storage module 100 can be improved. Therefore, in the electrical storage module 100, the temperature of the 1st electrical storage cell 10a can be measured more correctly. For example, the power storage module 100 can measure the accurate temperature of the power storage cell 10, so that the deterioration time of the power storage cell 10 can be accurately known and used without mistaking the life of the power storage cell 10. it can.

  The power storage module 100 includes an insulating separator 20 provided between adjacent power storage cells 10, and the first member 30, the second member 32, and the separator 20 are integrally formed. Therefore, in the electrical storage module 100, by providing the 1st member 30 and the 2nd member 32, it can suppress that the number of parts increases, and can prevent that cost becomes high.

  In the power storage module 100, the separator 20 has an opening 23 on a surface 22 a that contacts the power storage cell 10. Therefore, in the power storage module 100, the opening 23 can be used as a vent hole, and the heat dissipation of the power storage cell 10 can be improved. Further, in the power storage module 100, the separator 20 has an opening 25 in the side portion 24, and the opening 25 communicates with the opening 23. Therefore, the heat dissipation of the storage cell 10 can be further improved.

  In the power storage module 100, the power storage cell 10 is rectangular. For this reason, by stacking a plurality of power storage cells 10 in the perpendicular direction of the surface 11 having the largest area of the power storage cell 10, a reduction in the stacking direction (Y-axis direction) of the power storage cells 10 and high density energy are achieved. be able to.

  In the power storage module 100, the power storage cell 10 is a lithium ion capacitor. Therefore, the electrical storage cell 10 can have a large energy density and electrostatic capacity as compared with the electric double layer capacitor. Furthermore, the storage cell 10 is less likely to cause thermal runaway than the lithium ion secondary battery and can have high safety.

  In the power storage module 100, the urging unit 40 and the separator 20 are integrally formed. Therefore, in the electrical storage module 100, by providing the urging | biasing part 40, it can suppress that a number of parts increases, and can prevent that cost becomes high.

  In the power storage module 100, the wiring fixing portion 58 and the separator 20 are integrally formed. For this reason, in the power storage module 100, by providing the wiring fixing portion 58, it is possible to suppress an increase in the number of components and to prevent an increase in cost.

The present invention includes configurations that are substantially the same as the configurations described in the embodiments (for example, configurations that have the same functions, methods, and results, or configurations that have the same objects and effects). The present invention also includes a configuration in which a non-essential part of the configuration described in the above embodiment is replaced with another configuration. Furthermore, the present invention includes a configuration that achieves the same effects as the configuration described in the above embodiment or a configuration that can achieve the same object. Furthermore, the present invention includes a configuration obtained by adding a known technique to the configuration described in the above embodiment.

DESCRIPTION OF SYMBOLS 10 ... Power storage cell, 10a ... 1st power storage cell, 10b ... 2nd power storage cell, 11 ... Surface, 12 ... Exterior body, 14 ... Sealing plate, 15 ... Safety valve, 16 ... Positive electrode terminal, 18 ... Negative electrode terminal, 20 ... Separator 22 ... Insulating part, 22a ... Surface, 23 ... Opening part, 24 ... Side part, 25 ... Opening part, 30 ... First member, 32 ... Second member, 34 ... Third member, 36 ... Fourth member, 40 ... biasing part, 50 ... temperature sensor, 51 ... first part, 52 ... second part, 53 ... third part, 54 ... fourth part, 55 ... fifth part, 56 ... sixth part, 57 ... wiring, 58 ... wiring fixing part, 100 ... power storage module

Claims (9)

A power storage module in which a plurality of power storage cells are stacked,
A temperature sensor provided between the adjacent storage cells;
Including
The temperature sensor is a power storage module that is in contact with one power storage cell of the adjacent power storage cells and is separated from the other power storage cell of the adjacent power storage cells. In claim 1,
The temperature sensor is a power storage module having a sheet shape. In claim 1 or 2,
A first member and a second member provided between the storage cells adjacent to each other and spaced apart from each other;
The temperature sensor is inserted between the first member and the second member,
The temperature sensor is
A first portion of the first member located in a first direction;
A second portion of the second member located in a second direction opposite to the first direction;
Have
The second member is located in a third direction perpendicular to the first direction and the second direction, rather than the first member,
Seen from the third direction,
The first part and the second member overlap,
The power storage module, wherein the second portion and the first member overlap each other. In any one of Claims 1 thru | or 3,
An energy storage module including an urging unit that urges the temperature sensor to one of the energy storage cells of the adjacent energy storage cells. In claim 4,
The urging portion is a power storage module that is a leaf spring. In claim 3,
Including an insulating separator provided between the storage cells adjacent to each other;
The power storage module, wherein the first member, the second member, and the separator are integrally formed. In claim 6,
The power storage module, wherein the separator has an opening on a surface in contact with the power storage cell. In any one of Claims 1 thru | or 7,
The power storage module is a power storage module having a rectangular shape or a laminate type. In any one of Claims 1 thru | or 8,
The electricity storage module, wherein the electricity storage cell is a lithium ion capacitor.

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