JP2013178919A - Battery device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery device in which an abnormal battery can be discharged while suppressing up-sizing.SOLUTION: A battery device 1 includes a battery 2a from which electrode tabs 204, 205 are led out, and a short circuit member for short-circuiting the electrode tabs 204, 205 upon expansion of the battery 2a. In a state before expansion of the battery 2a, the short circuit member is separated by a predetermined distance L1 from the electrode tabs 204, 205. The short circuit member has conductive electrode tab contact members 51a, 52a coming into contact with the electrode tabs 204, 205, respectively, when the battery 2a expands to move the electrode tabs 204, 205, and a short circuit 53 for short-circuiting the electrode tabs 204, 205 via the electrode tab contact members 51a, 52a when the electrode tab contact members 51a, 52a come into contact with the electrode tabs 204, 205, respectively.

Description

  The present invention relates to a battery device having a battery.

  When an abnormality occurs in the power generation element and the power generation element generates heat, in order to discharge the battery in which the abnormality occurred in the power generation element, the bimetal was deformed by the heat of the power generation element and the positive and negative terminals of the battery were short-circuited Secondary batteries are known (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 11-40203

  However, in the above-described invention, it is necessary to provide a space in the secondary battery when the bimetal is deformed, and there is a problem that the secondary battery is increased in size.

  The problem to be solved by the present invention is to provide a battery device capable of ensuring safety by spreading current when a battery becomes abnormal.

  The present invention provides a pair of electrode tab contact members that contact each of the pair of electrode tabs and a pair of electrodes via the pair of electrode tab contact members when the pair of electrode tabs moves as the battery expands. The said subject is solved by having provided the short circuit which short-circuits tabs.

  According to the present invention, safety can be ensured by diffusing current when a battery becomes abnormal.

FIG. 1 is a schematic cross-sectional view of the battery device according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of the battery according to the first embodiment of the present invention. FIG. 3 is a plan view of the battery according to the first embodiment of the present invention. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is a schematic cross-sectional view illustrating the operation of the battery device according to the first embodiment of the present invention. FIG. 6 is a cross-sectional view of the battery device according to the second embodiment of the present invention.

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

<< first embodiment >>
FIG. 1 is a schematic cross-sectional view of a battery device according to the present embodiment, FIG. 2 is a cross-sectional view of the battery according to the present embodiment, and FIG. 3 is a plan view of the battery according to the present embodiment.

  As shown in FIG. 1, the battery device 1 according to the present embodiment includes four batteries 2a to 2d, a module can 4, positive electrode tab contact members 51a to 51e, and negative electrode tab contact members 52a to 52e (not shown in FIG. 1). And a short circuit 53.

  The four batteries 2a to 2d in the present embodiment are housed inside the module can 4 while being stacked on each other and connected to each other by a bus bar 3 in series connection or parallel connection. These batteries 2a to 2d have the same configuration as the battery 2 described below. Therefore, in the following, instead of describing the individual configurations of the batteries 2a to 2d, the configuration of the battery 2 will be described as a representative.

  The battery 2 (batteries 2a to 2d) is a flat battery as shown in FIG. Examples of the battery 2 include a nonaqueous electrolyte secondary battery such as a lithium ion secondary battery. The battery 2 is not particularly limited as long as the battery 2 has a structure in which a power generation element (described later) is included by a laminate film. Below, the structure in case the battery 2 is a lithium ion secondary battery is demonstrated in detail.

  As shown in FIG. 2, the battery 2 includes three positive plates 201, five separators 202, three negative plates 203, a positive tab 204, and a negative tab 205 (not shown in FIG. 2). And an upper exterior member 206, a lower exterior member 207, and an electrolyte (not shown). In the present embodiment, the positive electrode plate 201, the separator 202, the negative electrode plate 203, and the electrolyte are particularly referred to as a power generation element 208.

  In this power generation element 208, positive plates 201 and negative plates 203 are alternately stacked with separators 202 interposed therebetween. The three positive plates 201 are respectively connected to the positive tab 204 made of metal foil via the positive current collector 201a, and the three negative plates 203 are connected to the negative current collector 203a. Similarly, they are connected to the negative electrode tab 205 made of metal foil.

  As shown in FIG. 2, the positive electrode plate 201 is formed by laminating positive electrode layers 201b and 201c on a part of the positive electrode current collector 201a extending to the positive electrode tab 204. Negative electrode layers 203b and 203c are laminated on a part of the negative electrode side current collector 203a extending to 205 (not shown in the figure).

  In addition, the positive electrode plate 201, the separator 202, and the negative electrode plate 203 of the power generation element 208 are not limited to the above number. For example, a power generation element can be configured with one positive plate, three separators, and one negative plate, and the number of positive plates, separators, and negative plates can be selected as necessary. it can.

  Here, as shown in FIG. 3, in the battery 2 in the present embodiment, the positive electrode tab 204 and the negative electrode tab 205 are led side by side from one side of the exterior members 206 and 207. For this reason, in FIG. 2, the cross section from the positive electrode plate 201 to the positive electrode tab 204 of the power generation element 208 is illustrated, and the cross section from the negative electrode plate 203 to the negative electrode tab 205 is omitted. 205 also has substantially the same structure as the positive electrode plate 201 and the positive electrode tab 204 shown in FIG. However, the positive electrode plate 201 (positive electrode side current collector 201a) between the end of the laminated electrode body (the positive electrode plate 201, the separator 202 and the negative electrode plate 203) laminated to the positive electrode tab 204 of the power generation element 208, and The negative electrode plate 203 (negative electrode side current collector 203a) between the end of the laminated electrode body and the negative electrode tab 205 is cut out to half or less so as not to contact each other in the plan view shown in FIG. It is.

  As shown in FIG. 2, the power generation element 208 described above is accommodated and sealed between the upper exterior member 206 and the lower exterior member 207. The upper exterior member 206 and the lower exterior member 207 in the present embodiment are both made of a laminate film made of an inner resin layer, a metal layer, and an outer resin layer, although not particularly illustrated.

  The inner resin layer of this laminate film can be composed of a resin film excellent in electrolytic solution resistance and heat fusion properties such as polyethylene, modified polyethylene, polypropylene, modified polypropylene, or ionomer. Moreover, as a metal layer, it can comprise with metal foil, such as aluminum, for example, and as an outer side resin layer, it comprises with resin films excellent in electrical insulation, such as a polyamide-type resin and a polyester-type resin, for example. Can do.

  These exterior members 206 and 207 enclose part of the electrode tabs 204 and 205 and the power generation element 208, and in a space formed by the exterior members 206 and 207, lithium perchlorate, lithium borofluoride, While injecting a liquid electrolyte having a lithium salt such as lithium hexafluorophosphate as a solute, the space is evacuated, and the electrode tabs 204 and 205 are led out, and the outer peripheral portions of the exterior members 206 and 207 are removed. Heat fusion by hot press. Accordingly, a part of the electrode tabs 204 and 205 and the power generation element 208 are accommodated and sealed between the exterior members 206 and 207.

  Here, in this embodiment, when the outer peripheral portions of the exterior members 206 and 207 are heat-sealed by hot pressing as described above, the exterior members 206 and 207 are also heat-sealed with a part of the electrode tabs 204 and 205. ing. That is, as shown in FIG. 3, the electrode tabs 204 and 205 are partially covered by the exterior members 206 and 207. Hereinafter, the portion of the exterior member 206 that covers the electrode tabs 204 and 205 is referred to as an electrode tab coating portion 206a, and the portion of the exterior member 207 that covers the electrode tabs 204 and 205 is referred to as an electrode tab coating portion 207a.

  The tip of each positive electrode tab 204 of the batteries 2a to 2d having the same configuration as the battery 2 described above is fixed to the bus bar 3 as shown in FIG. 1, and the tip of each negative electrode tab 205 of each of the batteries 2a to 2d. Although not particularly shown, the bus bar 3 is fixed to a bus bar different from the bus bar 3. Here, in FIG. 1, the positive electrode tab 204 of each of the batteries 2 a to 2 d is illustrated so that it can be confirmed from the side surface that the positive electrode tab 204 is sandwiched between the exterior members 206 and 207. Both sides (front side and back side in the figure) are sealed by exterior members 206 and 207 so that the portion of the positive electrode tab 204 located inside the exterior members 206 and 207 cannot be visually confirmed from the outside. (Same in FIG. 5).

  As shown in FIG. 1, the module can 4 has a box shape and accommodates the batteries 2 a to 2 d therein. The module can 4 is made of, for example, stainless steel having a thickness of about 1 mm. As will be described later, when the module can 4 is pressed by an expanded battery, the module can 4 can be deformed so as to expand according to the expansion of the battery. (See FIG. 5 described later).

  4 is a cross-sectional view taken along the line IV-IV in FIG. 1, and the state in which the positive electrode tab 204 and the negative electrode tab 205 of the batteries 2a to 2b stacked on each other are arranged side by side in the horizontal direction in the figure. Is shown. More specifically, the positive electrode tab 204 of the battery 2a is located on the left side of the negative electrode tab 205 of the battery 2a, and the positive electrode tab 204 of the battery 2b on which the battery 2a is stacked is the same as the negative electrode tab 205 of the battery 2b. Located on the left side in the figure. Further, the positive electrode tab 204 of the battery 2c on which the battery 2b is stacked is located on the left side of the negative electrode tab 205 of the battery 2c, and the positive electrode tab 204 of the battery 2d on which the battery 2c is stacked is the negative electrode tab 205 of the battery 2d. Located on the left side of the figure. Moreover, in FIG. 4, illustration of the part which exists in the back | inner side in a figure in battery 2a-2d is abbreviate | omitted.

  Hereinafter, the electrode tab contact members 51a and 52a shown in FIG. 4 will be described, and thereafter the electrode tab contact members 51b to 51e and 52b to 52e shown in FIG. 4 will be described.

  As shown in FIG. 4, the positive electrode tab contact member 51a is fixed to the short circuit 53 in a state of being positioned above the positive electrode tab 204 of the battery 2a. On the other hand, as shown in the figure, the negative electrode tab contact member 52a is fixed to the short circuit 53 in a state of being positioned above the negative electrode tab 205 of the battery 2a. These electrode tab contact members 51a and 52a have conductivity, and as will be described in detail later, the short circuit 53 also has conductivity. For this reason, the electrode tab contact members 51 a and 52 a are electrically connected to each other via the short circuit 53.

  As shown in the figure, the tips of the electrode tab contact members 51a and 52a are pointed and are in contact with the surface of the electrode tab covering portion 206a covering the electrode tabs 204 and 205. That is, the tips of the electrode tab contact members 51a and 52a are separated from the electrode tabs 204 and 205 by a predetermined distance L1 corresponding to the thickness of the electrode tab covering portion 206a. The electrode tab contact members 51a and 52a only need to be in a non-contact state with the electrode tabs 204 and 205, and the predetermined distance L1 from the tips of the electrode tab contact members 51a and 52a to the electrode tabs 204 and 205 is: It does not specifically limit to the thickness of said electrode tab coating | coated part 206a.

  Below, the effect | action of the electrode tab contact members 51a and 52a is demonstrated with reference to FIG.

  FIG. 5 is a schematic cross-sectional view for explaining the operation of the battery device in the present embodiment, and shows the battery device when the battery 2a is expanded.

  In the above-described battery, when abnormality such as overcharge or internal short circuit occurs, gas may be generated inside, and the battery may expand when the internal pressure rises due to such gas. .

  As shown in the figure, when the battery 2a expands, the battery 2a presses the module can 4 so as to expand it. At this time, the electrode tabs 204 and 205 of the battery 2a move upward in the figure so as to rotate with the tip fixed to the bus bar 3 as a fulcrum. Thereby, the electrode tabs 204 and 205 press the electrode tab contact members 51a and 52a through the electrode tab covering portion 206a substantially simultaneously.

  As a result, as shown in FIG. 5, the sharp tips of the electrode tab contact members 51a and 52a penetrate the electrode tab covering portion 206a and come into contact with the electrode tabs 204 and 205. Thereby, the electrode tabs 204 and 205 are short-circuited via the electrode tab contact members 51a and 52a and the short circuit 53, and the battery 2a is discharged. Thereby, when abnormality arises in the battery 2a, the progress of abnormality of the battery 2a can be suppressed.

  The tip shape of the electrode tab contact members 51a and 52a is not particularly limited as long as it is a shape that can penetrate (break through) the electrode tab covering portion 206a, and is needle-shaped, conical, pyramidal, or blade-shaped. Any of the shapes may be included. Thereby, when the battery 2a expands, the insulation state between the electrode tab contact members 51a and 52a and the electrode tab covering portion 206a is destroyed, and the electrode tab contact members 51a and 52a and the electrode tabs 204 and 205 are securely connected. Can be contacted.

  Here, as shown in FIG. 5, the electrode tab contact members 51a and 52a in the present embodiment are arranged so as to penetrate through a predetermined portion separated from the power generation element 208 by a predetermined distance L2 in the electrode tab covering portion 206a. Yes. The predetermined distance L2 is sufficiently separated from the power generation element 208 so that the electrolyte, gas, etc. inside the battery 2a do not leak outside when the electrode tab contact members 51a, 52a penetrate the electrode tab covering portion 206a. It is the distance to the position.

  As described above, when the battery expands, when the electrode tab contact member is in contact with the electrode tab and the battery is discharged, if the electrolyte or gas inside the battery leaks to the outside, the battery expands. The battery that has been deflated. As a result, the electrode tab may be separated from the electrode tab contact member and the battery may not be discharged. On the other hand, in the present embodiment, as described above, the electrolyte and gas inside the battery are difficult to leak to the outside. Therefore, when the battery becomes abnormal, the battery is discharged and It is possible to maintain the state in which the battery is discharged.

  Next, the electrode tab contact members 51b to 51e and 52b to 52e will be briefly described.

  As shown in FIG. 4, the electrode tab contact members 51b and 52b are disposed between the batteries 2a and 2b. The electrode tab contact members 51b and 52b pass through the electrode tab covering portion 206a of the battery 2b and come into contact with the electrode tabs 204 and 205 of the battery 2b when the battery 2b expands, via the short circuit 53. Then, the expanded battery 2b is discharged.

  As shown in FIG. 4, the electrode tab contact members 51b and 52b are pointed upward and downward in the figure from the central portion of the electrode tab contact members 51b and 52b, and support members 511a, Except for being fixed to the short circuit 53 via 521a, the configuration is substantially the same as the electrode tab contact members 51b and 52b described above.

  The electrode tab contact members 51c to 51e and 52c to 52e are members that discharge the expanded batteries 2b to 2d together with the short circuit 53 when the batteries 2b to 2d expand. About the structure of these electrode tab contact members 51c-51e, 52c-52e, it is the same as that of the electrode tab contact members 51a, 51b, 52a, 52b mentioned above.

  As illustrated in FIG. 4, the short circuit 53 is a frame-shaped member that surrounds the electrode tabs 204 and 205 of the batteries 2 a to 2 d, and is disposed inside the module can 4. The short circuit 53 is made of a conductive material, and electrically connects the positive electrode tab contact members 51a to 51e and the negative electrode tab contact members 52a to 52e as described above. For this reason, as shown in FIG. 5, if the electrode tab contact members 51 a and 52 a come into contact with the electrode tabs 204 and 205, the short circuit 53 is a circuit for short-circuiting the electrode tabs 204 and 205. Then, the battery 2a is discharged.

  The short circuit 53 has a rigidity higher than that of the module can 4. For example, as shown in FIG. 5, when the battery 2 a expands and pushes the module can 4 outward from the inside, The displacement H2 of the short circuit 53 is relatively small with respect to the displacement H1 of the module can 4.

  Therefore, when the battery 2a expands as described above, the electrode tab contact members 51a and 52a fixed to the short circuit 53 rather than the displacement of the electrode tabs 204 and 205 of the battery 2a as shown in FIG. The displacement of becomes relatively small. As a result, the electrode tab contact members 51a and 52a are pressed against the electrode tabs 204 and 205, and the electrode tab contact members 51a and 52a pass through the electrode tab covering portion 206a and come into contact with the electrode tabs 204 and 205.

  As described above, in the present embodiment, when the battery expands, the electrode tabs are short-circuited using the movement of the electrode tabs of the battery in order to discharge the battery. In other words, since the electrode tab contact member and the short circuit are not actively moved or deformed, the electrode tab contact is made in a relatively narrow space in the battery device (for example, between the electrode tabs or around the electrode tab). A member or a short circuit can be arranged. Thereby, the enlargement of the battery apparatus accompanying providing an electrode tab contact member and a short circuit can be suppressed.

  Here, in this embodiment, since the electrode tabs are short-circuited in order to discharge the battery when the battery becomes abnormal, compared with the case where the power generation element is short-circuited by breaking through the exterior member. Inadvertently damaging the battery (electrolyte outflow, etc.) is suppressed.

  Moreover, in this embodiment, as mentioned above, the electrode tab contact member is arrange | positioned on the electrode tab coating | coated part. Thereby, compared with the case where the electrode tab contact member is disposed on the portion exposed from the electrode tab covering portion, it is possible to avoid unintentional shorting between the electrode tabs caused by vibration applied to the battery device. It is easy. In this embodiment, since an unintended short circuit between the electrode tabs is avoided in this way, the battery device can be assembled safely. Moreover, in this embodiment, since the electrode tab and the electrode tab contact member are insulated using the exterior member with which the battery is equipped, the structure for insulating both can be reduced in cost. In this embodiment, the electrode tab contact member is arranged on the electrode tab covering portion. However, depending on the design or the like, the electrode tab contact member may be disposed on the portion exposed from the electrode tab covering portion. Of course, it is also possible to arrange them.

  Although not shown in particular, an insulating film may be laminated on the electrode tab covering portion in order to surely prevent an unintended short circuit between the electrode tabs. Alternatively, an insulating film may be attached to a portion of the electrode tab exposed from the exterior member, and the electrode tab and the electrode tab contact member may be insulated by the insulating film. In these cases, the insulating film is made of a rubber or plastic material that can be penetrated by the electrode tab contact member.

  As described above, in this embodiment, the current of the expanded battery is discharged to the short circuit, but in addition to this, charging / discharging of the expanded battery is stopped by the controller that controls charging / discharging of the battery. You may let them.

  For example, when the electrode tabs of the battery are short-circuited, the current flowing through the short circuit or the module can electrically connected to the short circuit is detected by an ammeter, and based on the detection result, the controller The charging / discharging of the battery may be stopped. In this case, an insulating film or the like may be attached to the inner wall of the module can in order to improve the insulation between the module can and the battery. In addition, when the current flowing in the electric circuit to which the battery is connected decreases, it can be determined that the battery electrode tabs are short-circuited. In this case, the controller stops charging / discharging of the battery. Also good.

  Next, a second embodiment will be described.

<< Second Embodiment >>
FIG. 6 is a cross-sectional view of the battery device in the present embodiment. FIG. 6 is a cross-sectional view corresponding to FIG. 4 shown in the first embodiment.

  The battery device 1a in the present embodiment differs from the first embodiment in that the battery device 1a further includes the fins 6 and the short circuit 53a includes the high resistance portion 531. This is the same as in the first embodiment. In the following, only the parts different from the first embodiment will be described, and the same components as those in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

  The fin 6 is a member that radiates heat generated in the short circuit 53a to the outside through the module can 4 when the electrode tabs 204 and 205 of the batteries 2a to 2d are short-circuited. As shown in FIG. 6, the fin 6 is disposed at a substantially central portion of each of an upper portion, a lower portion, and both side portions of the short circuit 53 a, and compared with a high resistance portion 531 described later, the power generation element 208. Is located relatively close to.

  In the present embodiment, the fin 6 actively dissipates the heat of the short circuit 53a to the outside, thereby suppressing the heat transfer to the power generation element 208 and suppressing the temperature increase of the power generation element 208. Furthermore, in the present embodiment, the heat of the short circuit 53a is actively dissipated at a position closer to the power generation element 208 than the high resistance portion 531 described later, thereby making it difficult to transfer the heat of the short circuit 53a to the power generation element 208. ing.

  In the present embodiment, as described above, the fins 6 are provided in the short circuit 53a, but there is no particular limitation. Although not particularly shown, fins may be arranged on the outer surface of the module can at portions corresponding to the short circuit, and the heat of the short circuit may be dissipated to the outside.

  The high resistance portion 531 in the present embodiment is a portion where the electrical resistance is high in the short circuit 53a. As shown in FIG. 6, the high resistance portion 531 is arranged at the four corners of the frame-like short circuit 53 a so as to be positioned relatively far from the power generation element 208 in the batteries 2 a to 2 d.

  In the present embodiment, when the electrode tabs 204 and 205 of the batteries 2a to 2d are short-circuited, the current flowing to the short circuit 53a through the electrode tabs 204 and 205 is reduced by the high resistance portion 531. Thereby, since the batteries 2a to 2d can be discharged slowly, the temperature rise of the batteries 2a to 2d can be suppressed. Further, burnout of the short circuit 53a due to the flow of a large current is suppressed.

  Moreover, in this embodiment, since the high resistance part 531 was arrange | positioned in the position comparatively far from the power generation element 208 of the batteries 2a-2d, the heat generated by the current flowing through the high resistance part 531 can be generated by the module can 4. Or directly transmitted to the power generation element 208 of the batteries 2a to 2d.

  Further, in the present embodiment, when the electrode tabs 204 and 205 of the battery 2a are short-circuited, as shown in FIG. 6, the positive electrode is connected so that current flows through the high resistance portions 531 disposed at the four corners of the short circuit 53a. The tab contact member 51a is connected to the left side of the short circuit 53a by the support member 511b, and the negative tab contact member 52a is connected to the right side of the short circuit 53a by the support member 521b. I am letting. Similarly, the electrode tab contact members 51e and 52e are also connected to the side of the short circuit 53a by support members 511c and 521c.

  Further, in this embodiment, although not shown in particular, an insulating member such as an insulating film is interposed between the module can 4 and the module can 4. As a result, when the batteries 2a to 2d expand and the electrode tabs 204 and 205 are short-circuited, the current is prevented from flowing through the module can 4 and the current flows through the high resistance portion 531 of the short circuit 53a. I am doing so.

  Also in the present embodiment, as in the first embodiment, when the battery expands due to an abnormality such as overcharge, the pair of electrode tabs of the expanded battery press the pair of electrode tab contact members. Move to. Thereby, each of a pair of electrode tab is made to contact a pair of electrode tab contact member, and a pair of electrode tab is short-circuited via a short circuit.

  Thereby, also in this embodiment, it is possible to discharge a battery in which an abnormality such as overcharge has occurred while suppressing an increase in size of the battery device.

  Also in the present embodiment, as in the first embodiment, the electrode tab contact member penetrates through a predetermined portion separated from the power generation element by a predetermined distance L2 in the electrode tab covering portion. For this reason, when the electrode tab contact member penetrates the electrode tab covering portion, the electrolyte, gas, and the like inside the battery are prevented from leaking to the outside.

  Also in this embodiment, the shape of the tip of the electrode tab contact member includes any one of a needle shape, a conical shape, a pyramid shape, or a blade shape, as in the first embodiment. For this reason, when a battery expand | swells and an electrode tab contact member is pressed by an electrode tab, an electrode tab contact member can penetrate an electrode tab coating | coated part reliably.

  Also in the present embodiment, as in the first embodiment, the electrode tab covering portion insulates the electrode tab and the electrode tab contact member. Thereby, the unintended short circuit of electrode tabs can be prevented.

  The electrode tab contact members 51a to 51e, 52a to 52e and the short circuit 53 in the first and second embodiments correspond to an example of the short circuit means of the present invention, and the predetermined distance L1 in the first and second embodiments is the main distance. It corresponds to an example of the first predetermined distance in the invention, the predetermined distance L2 in the first and second embodiments corresponds to an example of the second predetermined distance of the present invention, and the fin 6 in the second embodiment of the present invention. It corresponds to an example of a heat dissipation part.

  The embodiments described above are described for facilitating the understanding of the present invention, and are 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, in the first and second embodiments described above, when the battery expands, the pair of electrode tabs are brought into contact with the electrode tab contact member, thereby conducting with the short circuit, thereby causing current diffusion. Although a specific example has been described, the member for conducting the short circuit when the battery expands is not particularly limited to a pair of electrode tabs. That is, for example, when the battery expands, the contact member having the same configuration as the electrode tab contact member is a part of the power generation element 208 shown in FIG. 2 (for example, the positive electrode layers 201b and 201c of the positive electrode side current collector 201a). In contact with a portion where the negative electrode layer is not formed (ie, a portion where the negative electrode layer is not formed) or a portion where the negative electrode layers 203b and 203c of the negative electrode current collector 203a are not formed (ie, a portion where the negative electrode layer is not formed). It is good also as a structure.

DESCRIPTION OF SYMBOLS 1 ... Battery apparatus 2 ... Battery 3 ... Bus bar 4 ... Module can 5 ... Short circuit member 51a-51e ... Positive electrode tab contact member 52a-52e ... Negative electrode tab contact member 53 ... Short circuit

Claims (8)

A battery in which a pair of electrode tabs electrically connected to the power generation element is led out from a film-like exterior member enclosing the power generation element,
Short-circuit means for short-circuiting the pair of electrode tabs when the battery expands,
The short-circuit means includes
In a state before the battery expands, the battery is disposed at a first predetermined distance from the pair of electrode tabs, and the pair of electrode tabs moves as the battery expands. A pair of conductive electrode tab contact members in contact with each of the pair of electrode tabs;
A short circuit that short-circuits the pair of electrode tabs via the pair of electrode tab contact members when the pair of electrode tab contact members contact each of the pair of electrode tabs. Battery device. The battery device according to claim 1,
The exterior member has an electrode tab covering portion that covers at least a part of each of the pair of electrode tabs,
The pair of electrode tab contact members pass through the electrode tab covering portion and contact with each of the pair of electrode tabs when the pair of electrode tabs move as the battery expands. A battery device. The battery device according to claim 2,
A pair of said electrode tab contact members penetrates the predetermined part spaced apart only 2nd predetermined distance from the said electric power generation element among the said electrode tab coating | coated parts, The battery device characterized by the above-mentioned. The battery device according to any one of claims 1 to 3,
The short circuit has a high resistance portion having a high electric resistance. The battery device according to claim 1, wherein
The battery device characterized in that the short-circuit means has a heat-dissipating part that dissipates heat from the short-circuit. The battery device according to any one of claims 1 to 3,
The short circuit has a high resistance portion with high electrical resistance, and
The short-circuit means has a heat dissipation part that dissipates heat of the short-circuit,
The battery device, wherein the heat dissipating part is disposed closer to the power generation element than the high resistance part of the short circuit. The battery device according to any one of claims 1 to 6,
In the electrode tab contact member, the shape of the portion in contact with the electrode tab has any one of a needle shape, a cone shape, a pyramid shape, and a blade shape. A battery in which a pair of electrode tabs electrically connected to the power generation element is led out from a film-like exterior member enclosing the power generation element,
A conductive means electrically connected to a specific conductive member among the conductive members constituting the battery when the battery expands; and
The conduction means is
In a state before the battery expands, the specific conductive material is disposed when the battery is disposed at a predetermined distance from the specific conductive member and the battery shape changes as the battery expands. A contact member that contacts the sex member;
A battery device comprising: a conduction circuit that conducts with the specific conductive member when the contact member comes into contact with the specific conductive member.

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