JP2016015237A - Temperature detection element for secondary battery and battery device including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a temperature detection element for secondary battery capable of suppressing occurrence of electrolytic corrosion in an exterior member of the secondary battery or a metal housing for housing the secondary battery.SOLUTION: A temperature detection element 3 for secondary battery comes into contact with a secondary battery 22 housing a power generation element 222 or a case 24 housing the secondary battery 22 by means of an exterior member 221 having an intermediate metal layer 221b, and detects the temperature of the secondary battery 22. A detection element body 31 is covered with a coating member 32 composed of a metallic material having ionization tendency equal to or higher than that of a metallic material composing the intermediate metal layer 221b or the case 24.

Description

  The present invention relates to a temperature detection element for a secondary battery and a battery device including the same.

  An assembled battery that measures the temperature of a film-covered battery by providing unevenness on a bottom plate of a device case that accommodates the film-covered battery and inserting a thermistor into a space formed by the unevenness is known (for example, Patent Document 1). reference). In this technique, the temperature measuring electrode of the thermistor is molded with a resin material.

International Publication No. 2006/06973

  However, since the resin material has low thermal conductivity and causes a decrease in temperature measurement responsiveness, it is conceivable to cover the temperature measuring electrode with a metal material having high thermal conductivity. There is a problem that electrolytic corrosion occurs in a device case that houses the metal film or the film-clad battery.

  A problem to be solved by the present invention is to provide a temperature detection element for a secondary battery that can suppress the occurrence of electrolytic corrosion in an exterior member provided in the secondary battery or a metal housing that accommodates the secondary battery, and the same. A battery device is provided.

  The present invention comprises a covering member made of a metal material that has an ionization tendency equal to or higher than an ionization tendency of a metal layer that constitutes a metal layer of an exterior member of a secondary battery or a metal casing that houses the secondary battery, and the covering The above problem is solved by covering the detection element body of the secondary battery temperature detection element with a member.

  According to the present invention, the ionization tendency of the metal material constituting the covering member that covers the detection element main body is greater than the ionization tendency of the metal layer constituting the exterior member of the secondary battery or the metal material constituting the metal housing. In the contact surface between the metal layer or metal casing and the covering member, electrolytic corrosion tends to occur on the covering member side. Thereby, it can suppress that an electric corrosion generate | occur | produces in the exterior member or metal housing | casing of a secondary battery.

FIG. 1 is an exploded perspective view showing an assembled battery in an embodiment of the present invention. FIG. 2 is an exploded perspective view showing the battery module in the embodiment of the present invention. FIG. 3 is a perspective view showing the secondary battery in the embodiment of the present invention. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is a cross-sectional view for explaining a mounting state of the temperature detection element in the embodiment of the present invention. FIG. 6 is an enlarged view of a portion VI in FIG. FIG. 7 is a cross-sectional view showing a first modification of the temperature detection element in the embodiment of the present invention. FIG. 8 is a cross-sectional view showing a second modification of the temperature detection element in the embodiment of the present invention. FIG. 9 is a cross-sectional view showing a third modification of the temperature detection element in the embodiment of the present invention. FIG. 10 is a cross-sectional view showing a fourth modification of the temperature detection element in the embodiment of the present invention. FIG. 11 is a cross-sectional view showing a modification of the mounting state of the temperature detection element in the embodiment of the present invention. FIG. 12 is a cross-sectional view showing another modification of the mounting state of the temperature detection element in the embodiment of the present invention. FIG. 13 is a cross-sectional view showing another modification of the mounting state of the temperature detection element in the embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<< first embodiment >>
FIG. 1 is an exploded perspective view showing an assembled battery in the present embodiment, FIG. 2 is an exploded perspective view showing a battery module in the present embodiment, and FIG. 3 is a perspective view showing a secondary battery in the present embodiment. 4 is a cross-sectional view taken along the line IV-IV in FIG.

  The assembled battery 1 according to the present embodiment is an assembled battery that is mounted as a driving power source in an electric vehicle (EV), a hybrid vehicle (HEV), or the like, for example, and is stacked via a spacer 11 as shown in FIG. A plurality of (in this example, 12) battery modules 12 are provided. Note that the number of stacked battery modules 12 constituting the assembled battery 1 is not particularly limited. The assembled battery 1 in the present embodiment corresponds to an example of the battery device of the present invention.

  As shown in FIG. 2, the battery module 12 includes a secondary battery 22 stacked on top of each other and a case 24 that houses the secondary battery 22, and a temperature for detecting the temperature of the secondary battery 22. A detection element 3 (not shown in FIG. 2) is provided.

  As shown in FIG. 3, the secondary battery 22 in the present embodiment is a thin and flat battery, and a spacer 23 is attached to an end portion.

  As shown in FIG. 4, the secondary battery 22 includes a power generation element 222 accommodated in a pair of laminate film exterior members 221, and the pair of exterior members 221 is sealed at the outer peripheral portion 223 of the accommodation portion. Has been. In FIG. 3, only one of the exterior members 221 is shown, and the power generation element 222 is shown in FIG. The laminated film constituting the exterior member 221 has, for example, a three-layer structure as shown in the drawing sectional view A of FIG. 4, and the inner resin layer 221 a and the intermediate metal layer are sequentially formed from the inner side to the outer side of the secondary battery 22. 221b and the outer resin layer 221c can be formed.

  Examples of the material constituting the inner resin layer 221a include a resin film excellent in electrolytic solution resistance and heat fusion properties such as polyethylene, modified polyethylene, polypropylene, modified polypropylene, or ionomer. Examples of the material constituting the intermediate metal layer 221b include metal foil such as aluminum. Moreover, as a material which comprises the outer side resin layer 221c, the resin film excellent in electrical insulation, such as a polyamide-type resin or a polyester-type resin, can be illustrated. The intermediate metal layer 221b in the present embodiment corresponds to an example of the metal layer of the present invention.

  Since the pair of exterior members 221 includes the intermediate metal layer 221b in addition to the inner and outer resin layers 221a and 221c, the strength of the exterior member 221 itself can be improved. Further, by forming the inner resin layer 221a of the exterior member 221 with a resin such as polyethylene, modified polyethylene, polypropylene, modified polypropylene, or ionomer, it is possible to achieve good fusion with the metal electrode terminals 224 and 225. Can be secured.

  In addition, the exterior member 221 in the present invention is not limited to the three-layer structure described above, and may have a single-layer structure of the inner or outer resin layers 221a and 221c. Further, a two-layer structure of either one of the inner or outer resin layers 221a and 221c and the intermediate metal layer 221b may be used. Furthermore, the structure of four layers or more may be sufficient as needed.

  Each of the pair of exterior members 221 has a shape in which a rectangular flat plate is formed into a shallow bowl shape (dish shape) so that the power generation element 222 can be accommodated. The outer peripheral part 223 is overlapped, and the entire periphery of the outer peripheral part 223 is joined by heat fusion or an adhesive.

  The secondary battery 22 of this example is a lithium ion secondary battery, and includes a power generation element 222 configured by laminating a separator 222c between a positive electrode plate 222a and a negative electrode plate 222b, as shown in FIG. ing. The power generation element 222 of this example includes three positive plates 222a, five separators 222c, three negative plates 222b, and an electrolyte (not shown). The secondary battery 22 according to the present invention is not limited to a lithium ion secondary battery, and may be, for example, an alkaline storage battery such as a nickel-cadmium battery or another battery such as a lead storage battery.

  The positive electrode plate 222a constituting the power generation element 222 includes a positive electrode side current collector 222d extending to the positive electrode terminal 224, and positive electrode layers 222e and 222f formed on both main surfaces of a part of the positive electrode side current collector 222d, respectively. Have In this example, the positive electrode plate 222a and the positive electrode side current collector 222d are formed of a single conductor. However, the positive electrode plate 222a and the positive electrode side current collector 222d are formed of different members, and You may join.

  The positive electrode side current collector 222d of the positive electrode plate 222a is made of an electrochemically stable metal foil such as an aluminum foil, an aluminum alloy foil, a copper foil, or a nickel foil. The positive electrode layers 222e and 222f of the positive electrode plate 222a are made of, for example, a lithium composite oxide such as lithium nickelate (LiNiO2), lithium manganate (LiMnO2), or lithium cobaltate (LiCoO2), chalcogen (S, Se, Te). A mixture of a positive electrode active material such as fluoride, a conductive agent such as carbon black, an adhesive such as an aqueous dispersion of polytetrafluoroethylene, and a solvent is applied to both main surfaces of the positive electrode side current collector 222d. It is formed by applying, drying and rolling.

  The negative electrode plate 222b constituting the power generation element 222 includes a negative electrode side current collector 222g extending to the negative electrode terminal 225, and negative electrode layers 222h and 222i formed on both main surfaces of a part of the negative electrode side current collector 222g, respectively. And have. In this example, the negative electrode plate 222b and the negative electrode side current collector 222g are formed of a single conductor. However, the negative electrode plate 222b and the negative electrode side current collector 222g are formed of different members, and You may join.

  The negative electrode side current collector 222g of the negative electrode plate 222b is made of an electrochemically stable metal foil such as a nickel foil, a copper foil, a stainless steel foil, or an iron foil. The negative electrode layers 222h and 222i of the negative electrode plate 222b are negative electrodes that occlude and release lithium ions of the positive electrode active material, such as amorphous carbon, non-graphitizable carbon, graphitizable carbon, or graphite. An active material is mixed with an aqueous dispersion of styrene butadiene rubber resin powder as a precursor material of an organic fired body, dried and then pulverized to carry carbonized styrene butadiene rubber on the carbon particle surface. The main material. The main material is formed by further mixing a binder such as an acrylic resin emulsion, applying the mixture to both main surfaces of the negative electrode side current collector 222g, and drying and rolling.

  The separator 222c laminated between the positive electrode plate 222a and the negative electrode plate 222b prevents a short circuit between the positive electrode plate 222a and the negative electrode plate 222b, and may have a function of holding an electrolyte. The separator 222c is a microporous film made of, for example, a polyolefin such as polyethylene or polypropylene. When an overcurrent flows, the separator 222c also has a function of blocking the current by closing the pores of the layer due to heat generation. However, the separator 222c is not limited to a single-layer film such as a polyolefin, and a three-layer structure in which a polypropylene film is stacked with a polyethylene film interposed therebetween, or a structure in which a polyolefin microporous film and an organic nonwoven fabric are stacked can also be used. Thus, by making the separator 222c into multiple layers, various functions such as an overcurrent prevention function, an electrolyte holding function, and a shape maintaining (stiffness improvement) function of the separator 222c can be provided.

  The power generating element 222 described above is configured by alternately stacking positive plates 222a and negative plates 222b with separators 222c interposed therebetween. The three positive plates 222a are respectively connected to the positive terminal 224 made of metal foil via the positive current collector 222d, while the three negative plates 222b are connected to the negative current collector 222g. In the same manner, each is connected to a negative electrode terminal 225 made of metal foil.

  As shown in FIGS. 3 and 4, a positive electrode terminal 224 and a negative electrode terminal 225 are led out of the exterior member 221 from each of the positive electrode plate 222 a and the negative electrode plate 222 b of the power generation element 222. In the secondary battery 22 of this example, the positive electrode terminal 224 and the negative electrode terminal 225 are led out side by side from the outer peripheral portion 223 of one side of the exterior member 221 (short side in front of FIG. 3). The positive electrode terminal 224 and the negative electrode terminal 225 are also referred to as a positive electrode tab 224 and a negative electrode tab 225.

  4 illustrates a cross-sectional view of the power generation element 222 from the positive electrode plate 222a to the positive electrode terminal 224, and a cross section from the negative electrode plate 222b of the power generation element 222 to the negative electrode terminal 225 is omitted. The negative electrode terminal 225 has the same structure as the positive electrode plate 222a and the positive electrode terminal 224 shown in the cross-sectional view of FIG. However, the positive electrode plate 222a (positive electrode side current collector 222d) and the negative electrode plate 222b (negative electrode side current collector 222g) between the end of the power generation element 222 and the positive electrode terminal 224 and the negative electrode terminal 225 contact each other in plan view. Not cut in half so as not to do.

  Since the secondary battery 22 is rectangular in plan view, the outer peripheral portion 223 that joins the pair of exterior members 221 and seals the inside is also referred to as outer peripheral portions 223a to 223d as shown in FIG. In addition, the external shape of the secondary battery 22 is not limited to a rectangle, and can be formed in a square or other polygons. Further, the lead-out positions of the positive electrode terminal 224 and the negative electrode terminal 225 may be derived from each of the outer peripheral portions 223a and 223b and 223c and 223d facing each other, as well as being derived from one outer peripheral portion 223a as in this example. Good. Moreover, you may make it derive | lead-out from the outer peripheral parts 223c and 223d of a long side.

  When a battery module is configured by connecting a plurality of secondary batteries 22, the main surfaces of the plurality of secondary batteries 22 are stacked and accommodated in the case 24. In this case, the positive terminal 224 and the negative terminal 225 derived from the outer peripheral part 223a of the secondary battery 22, and the positive terminal 224 derived from the outer peripheral part 223a of the secondary battery 22 stacked on the secondary battery 22 and In order to ensure insulation from the negative electrode terminal 225 and to arrange a bus bar for connecting the positive electrode terminal 224 and the negative electrode terminal 225 in series and / or in parallel, or to arrange a connector for a voltage detection sensor A spacer 23 made of an insulating material is used.

  The spacer 23 in the present embodiment is disposed between the outer peripheral portions 223a and 223a of the secondary battery 22 when the secondary batteries 22 are stacked, and the secondary battery 22 is installed in the battery module 12 in a predetermined manner. The fixing through hole 231 into which the through bolt 25 for defining the arrangement of the battery modules 12 is inserted is fixed while being fixed to the position.

  The spacer 23 is made of an insulating resin material having rigidity such as polybutylene terephthalate (PBT) or polypropylene (PP), and is formed in a long shape having a length equal to or longer than the outer peripheral portion 223 a of the secondary battery 22. Has been. And the fixing through-hole 231 which consists of a sheath-like through-hole is formed in each of the both ends. It is desirable that the length of the spacer 23 is longer than the outer peripheral portion 223a to be mounted.

  A temperature detection element 3 for detecting the temperature of the secondary battery 22 is attached to the exterior member 221 of the secondary battery 22 in the present embodiment. As shown in FIG. 5, the temperature detection element 3 is positioned between the stacked secondary batteries 22A and 22B. In the example shown in FIG. 5, the temperature detection element 3 is attached to the secondary battery 22A located on the lower side in the figure, and detects the temperature of the secondary battery 22A. The secondary battery 22A in the present embodiment corresponds to an example of the first secondary battery of the present invention, and the secondary battery 22B in the present embodiment corresponds to an example of the second secondary battery of the present invention.

  The number of temperature detection elements 3 attached to the secondary battery 22 included in the battery module 12 is not particularly limited. For example, one or more temperature detection elements 3 may be attached to one secondary battery 22, and one temperature detection element 3 may be attached to every other secondary battery 22.

  As shown in FIG. 6, the temperature detection element 3 includes a detection element main body 31 and a covering member 32 that covers the detection element main body 31. The temperature detection element 3 in the present embodiment corresponds to an example of a temperature detection element for a secondary battery of the present invention.

  The detection element main body 31 has a function of measuring the external heat transmitted through the covering member 32, and is composed of a semiconductor element or the like having a characteristic that an electrical resistance value changes depending on the temperature. Two signal lines 311 and 312 are drawn out from the detection element main body 31. The signal lines 311 and 312 are drawn to the outside of the case 24 through through holes (not shown) formed in the case 24, and are connected to a control device (not shown). And the said control apparatus controls charge, discharge, etc. of the said secondary battery 22 based on the temperature information of the secondary battery 22 from the temperature detection element 3, for example.

  The covering member 32 covers the entire detection element main body 31 and is made of a metal material having an ionization tendency equal to or higher than the ionization tendency of the metal material constituting the intermediate metal layer 221 b of the exterior member 221 in the secondary battery 22. . In addition, it is preferable that the ionization tendency of the metal material which each comprises the covering member 32 and the intermediate metal layer 221b is mutually equal by comprising the covering member 32 with the same metal material as the metal material which comprises the intermediate metal layer 221b. .

  The temperature detection element 3 is fixed in contact with a predetermined position of the secondary battery 22A to be temperature-measured. The temperature detection element 3 is fixed to the secondary battery 22A by, for example, attaching an adhesive tape from above the temperature detection element 3 while the temperature detection element 3 is in direct contact with the secondary battery 22A to be measured. This can be done by attaching to the battery 22A.

  The contact surface 321 with the secondary battery 22A to be temperature-measured is preferably a flat surface or a smooth surface from the viewpoint of protecting the exterior member 221 of the secondary battery 22A and improving temperature measurement accuracy. Further, the surface 322 opposite to the contact surface 321 is also preferably a flat surface or a smooth surface from the viewpoint of protecting the exterior member 221 of the adjacent secondary battery 22B.

  The configuration of the temperature detection element is not particularly limited to the above. For example, an elastic resin member 33 is provided on the surface 322 opposite to the contact surface 321 with the secondary battery 22A to be measured, as in the temperature detection element 3B shown in FIG. 7, and the elastic resin member 33 is connected to the secondary battery 22A. It is good also as a structure which opposes the adjacent secondary battery 22B. Examples of such an elastic resin member 33 include rubber materials and sponge materials having excellent heat resistance.

  Further, for example, as in the temperature detection element 3C shown in FIG. 8, a spring member 34 is provided on the surface 322 opposite to the contact surface 321 with the secondary battery 22A to be measured, and the spring member 34 and the secondary battery 22B It is good also as a structure which provided the protective substrate 341 for protecting the exterior member 221 of the said secondary battery 22B in between. As such a spring member 34, a plate spring etc. other than a coil spring as shown in FIG. 8 can be illustrated. The elastic resin member 33 and the spring member 34 in the present embodiment correspond to an example of the elastic member of the present invention.

  Further, as in the temperature detection element 3D shown in FIG. 9, the outer surface of the covering member 32 excluding the contact surface 321 with the secondary battery 22A to be measured can be covered with a resin material 35 having excellent heat resistance. Good.

  Further, like the temperature detection element 3E shown in FIG. 10, a cover member 36 that covers the outer surface of the cover member 32 excluding the contact surface 321 with respect to the secondary battery 22A to be measured is provided and the contact surface 321 The spring member 34 may be provided between the opposite surface 322 and the cover member 36. Examples of the material constituting the cover member 36 include a resin material having excellent heat resistance. Although not particularly shown, an elastic resin member 33 may be provided in place of the spring member 34. The resin material 35 and the cover member 36 in the present embodiment correspond to an example of the resin member of the present invention.

  As shown in FIG. 2, the secondary battery 22 and the temperature detection element 3 described above are arranged so that the main surfaces of a plurality (eight in this example) of the secondary batteries 22 face each other with a spacer 23 interposed therebetween. In the case 24. The case 24 includes a lower case 241 having a box shape and an upper case 242 having a lid shape, and the lower case 241 and the upper case 242 are formed of a metal material such as aluminum, for example. In addition, by forming the lower case 241 and the upper case 242 with the same metal material as that constituting the covering member 32 of the temperature detecting element 3, ionization of the metal materials constituting the covering member 32 and the intermediate metal layer 221b, respectively. It is preferred that the trends are equal to each other.

  In the upper case 242, a through hole 242 a for inserting the through bolt 25 is formed at a position corresponding to the through hole 231 of the spacer 23. Although not shown in FIG. 2, a through hole for inserting the through bolt 25 is also formed in the lower case 241 at a position corresponding to the through hole 231 of the spacer 23.

  In the present embodiment, eight secondary batteries 22 are stacked and housed in the case 24, but the number of the secondary batteries 22 to be stacked is not particularly limited. For example, one secondary battery 22 may be housed in the case 24. The structure of the case is not particularly limited to the above, and the lower case and the upper case may both be box-shaped and their openings may be combined. The case 24 in the present embodiment corresponds to an example of a metal casing of the present invention.

  In addition, as shown in FIG. 11, when attaching the temperature detection element 3 to the exterior member 221 of the secondary battery 22 (the uppermost secondary battery 22 in FIG. 11) stacked on the outermost side, A through hole 243 corresponding to the attachment position of the temperature detection element 3 may be provided in the case 24, and the temperature detection element 3 may be exposed from the through hole 243.

  As shown in FIG. 1, the assembled battery 1 in the present embodiment includes the battery modules 12 stacked with the spacers 11 interposed between the battery modules 12 described above. The spacer 11 has the length of the battery module 12 along the height direction (Z-axis direction in FIG. 1), and has an insulating resin material having rigidity such as polybutylene terephthalate (PBT) or polypropylene (PP). It is composed of

  At both ends of the spacer 11, two through holes 111 for inserting through bolts 25 are formed. The through bolt 25 has a length substantially equal to the length of the assembled battery along the stacking direction of the battery modules 12 (X-axis direction in the drawing). The through bolt 25 is connected to the battery module 12 and the spacer 11. The battery modules 12 are fixed to each other by being inserted and fastened. Further, although not particularly illustrated, spacers 11 are similarly laminated on the back side in FIG. 1, and a total of four through bolts 25 are inserted into the assembled battery 1 so that the battery modules 12 are fixed to each other. Has been. And the space | gap is formed between the two battery modules 12 which pinch | interpose the said spacer 11 by the thickness of the spacer 11, Thereby, the heat | fever of the battery module 12 becomes easy to thermally radiate.

  Next, the operation in this embodiment will be described.

  The covering member 32 that covers the detection element main body 31 of the temperature detection element 3 in the present embodiment is made of a metal material that is superior in thermal conductivity to a resin material or the like. For this reason, it is possible to improve temperature measurement responsiveness and temperature measurement accuracy while protecting the detection element body 31 from an external force or the like.

  Further, the ionization tendency of the metal material constituting the covering member 32 is more than the ionization tendency of the metal material constituting the intermediate metal layer 221 b of the exterior member 221 in the secondary battery 22. For this reason, when the temperature detection element 3 is attached to the exterior member 221 of the secondary battery 22, the outer resin layer 221 c constituting the exterior member 221 is slightly damaged and the covering member 32 of the temperature detection element 3 becomes the intermediate metal layer. Even when it comes into contact with 221b, the covering member 32 tends to galvanize more than the intermediate metal layer 221b. Thereby, it is possible to suppress the occurrence of electrolytic corrosion on the intermediate metal layer 221b of the secondary battery 22.

  In addition, when the covering member 32 is made of the same metal material as that constituting the intermediate metal layer 221b, electrolytic corrosion occurs on both the intermediate metal layer 221b and the covering member 32 of the temperature detection element 3. Generation | occurrence | production can be suppressed. In addition, this effect makes it possible to minimize the thickness of the covering member 32 and further improve the temperature measurement response and the temperature measurement accuracy.

  Further, in the temperature detection elements 3B, 3C, and 3E configured as shown in FIGS. 7, 8, and 10, the temperature detection elements 3B, 3C, and 3E are attached by the elastic force of the elastic resin member 33 or the spring member 34. The expansion force when the secondary battery 22A expands can be absorbed. Thereby, the influence of the said expansion | swelling to the adjacent secondary battery 22B can be suppressed to the minimum.

  Further, in the temperature detection elements 3D and 3E having the configurations shown in FIGS. 9 and 10, the measurement from outside (for example, environmental temperature) other than the secondary battery 22 as the measurement object is performed due to the presence of the resin material 35 or the covering member 36. Since the temperature noise can be reduced, the temperature measurement response and the temperature measurement accuracy can be further improved.

  The embodiment described above is described for facilitating the understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

  For example, as shown in FIG. 12, the temperature detection element 3 may be attached to the outside of the case 24A of the battery module 12. In the example illustrated in FIG. 12, the temperature detection element 3 is attached to a substantially central portion of the case 24 </ b> A so as to be sandwiched between adjacent battery modules 12. At this time, the temperature detection element 3 may be independently attached to the secondary battery 22 accommodated in the case 24A.

  In this case, the case 24A is made of a metal material having high thermal conductivity, and the ionization tendency of the metal material constituting the covering member 32 of the temperature detection element 3 is determined by the ionization of the metal material constituting the case 24A. The trend is over. For this reason, it is possible to suppress the occurrence of electrolytic corrosion in the case 24A without degrading the temperature measurement responsiveness and the temperature measurement accuracy.

  Further, when the covering member 32 is made of the same metal material as that constituting the case 24A, electrolytic corrosion is generated in both the case 24A and the covering member 32 of the temperature detection element 3. Can be suppressed.

  In the example shown in FIG. 12, the configuration of the temperature detection element may be the configuration shown in FIG. 7, FIG. 8, and FIG. In this case, the elastic force generated by the elastic resin member 33 and the spring member 34 can absorb the expansion force when the case 24A to which the temperature detection elements 3B, 3C, and 3E are attached is expanded. Thereby, the influence of the said expansion | swelling to case 24B of the adjacent battery module 12 can be suppressed to the minimum. The case 24A in this example corresponds to an example of the first metal casing of the present invention, and the case 24B in this example corresponds to an example of the second metal casing of the present invention.

  In the example shown in FIG. 12, the configuration of the temperature detection element may be the configuration shown in FIGS. In this case, with the presence of the resin material 35 or the covering member 36 that covers the covering member 32 except for the contact surface 321 between the temperature detection elements 3D and 3E and the case 24A, the temperature measurement responsiveness and the temperature measurement accuracy are further improved. More can be achieved.

  In addition, as shown in FIG. 13, the temperature detection element 3 may be attached to the spacer 11 instead of the exterior member 221 of the secondary battery 22. In this case, a through hole 243 into which the temperature detecting element 3 is inserted is provided in the case 24 of the battery module 12, and the secondary battery 22 (the uppermost layer in FIG. 12) stacked on the outermost side. The temperature detection element 3 is brought into contact with the exterior member 221 of the secondary battery 22).

  Even in this case, by making the ionization tendency of the metal material constituting the covering member 32 of the temperature detection element 3 equal to or more than the ionization tendency of the metal material constituting the intermediate metal layer 221b of the exterior member 221 of the secondary battery 22, The occurrence of electrolytic corrosion in the intermediate metal layer 221b can be suppressed.

  In addition, when the covering member 32 is made of the same metal material as that constituting the intermediate metal layer 221b, electrolytic corrosion occurs on both the intermediate metal layer 221b and the covering member 32 of the temperature detection element 3. Generation | occurrence | production can be suppressed.

  In the example shown in FIG. 13, the configuration of the temperature detection element may be the configuration shown in FIGS. 7, 8, and 10. In this case, the elastic force generated by the elastic resin member 33 and the spring member 34 absorbs the expansion force when the secondary battery 22 attached with the temperature detection elements 3B, 3C, and 3E is expanded, The influence of the expansion on the case 24B of the matching battery module 12 can be minimized.

  Also in the example shown in FIG. 13, the configuration of the temperature detection element may be the configuration shown in FIGS. 9 and 10. In this case, the presence of the resin material 35 or the covering member 36 that covers the covering member 32 except for the contact surface 321 can further improve the temperature measurement response and the temperature measurement accuracy.

DESCRIPTION OF SYMBOLS 1 ... Assembly battery 11 ... Spacer 12 ... Battery module 22, 22A, 22B ... Secondary battery 221 ... Exterior member 221a ... Inner resin layer 221b ... Intermediate metal layer 221c ··· Outside resin layer 222 ··· Power generation element 223 ··· Outer peripheral portion 23 ··· Spacer 231 ··· Through hole 24, 24A, 24B · · · Case 241 · · · Lower case 242 · · · Upper case 243 · · · ..Through hole 25 ... Through bolt 3 ... Temperature detection element 31 ... Detection element body 32 ... Coating member 321 ... Contact surface 322 ... Opposite surface 33 ... Elastic resin member 34 ... Spring member 35 ... Resin material 36 ... Cover member

Claims (9)

A secondary battery temperature detecting element for detecting a temperature of the secondary battery in contact with a secondary battery containing a power generation element by an exterior member having a metal layer or a metal casing containing the secondary battery. There,
A temperature detection element for a secondary battery, wherein a detection element body is covered with a covering member made of a metal material having an ionization tendency equal to or higher than an ionization tendency of a metal material constituting the metal layer or the metal casing. The temperature detection element for a secondary battery according to claim 1,
The temperature detecting element for a secondary battery, wherein the covering member is made of the same metal material as that of the metal layer or the metal casing. The temperature detection element for a secondary battery according to claim 1 or 2,
A temperature detecting element for a secondary battery, further comprising an elastic member provided on a surface opposite to a contact surface with the secondary battery or the metal casing. The temperature detection element for a secondary battery according to any one of claims 1 to 3,
A temperature detecting element for a secondary battery, further comprising a resin member that further covers the covering member except for a contact surface with the secondary battery or the metal casing. A secondary battery containing a power generation element by an exterior member having a metal layer;
A metal casing for housing the secondary battery;
A temperature detection element for a secondary battery that contacts the secondary battery or the metal casing and detects the temperature of the secondary battery, and
In the secondary battery temperature detection element, the detection element main body is covered with a covering member made of a metal material having an ionization tendency higher than that of the metal material constituting the metal layer or the metal casing. Battery device. The battery device according to claim 5,
The said covering member is a battery apparatus comprised from the same metal material as the metal material which comprises the said metal layer or the said metal housing | casing. The battery device according to claim 5 or 6, wherein a plurality of the secondary batteries are accommodated in the metal casing.
The secondary battery is
A first secondary battery in which the temperature detecting element for the secondary battery contacts one side;
A second secondary battery disposed adjacent to the one side of the first secondary battery,
The secondary battery temperature detection element further includes an elastic member provided between the secondary battery and the second secondary battery. The battery device according to any one of claims 5 to 7, comprising a plurality of the metal casings.
The metal casing is
A first metal casing in which the secondary battery temperature detecting element contacts one side;
A second metal casing disposed adjacent to the one side of the first metal casing, and
The secondary battery temperature detection element further includes an elastic member provided between the second metal casing and the second battery casing. The battery device according to any one of claims 5 to 8,
The secondary battery temperature detecting element further includes a resin member that further covers the covering member except for a contact surface with the secondary battery or the metal casing.

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