JP2014099347A - Power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology capable of generating a short-circuit in both cases where, when a load is applied to a power storage device, a short circuit inducing member at a positive electrode side moves toward a direction of the load and a short circuit inducing member at a negative electrode side moves toward the direction of the load.SOLUTION: A power storage device 2 includes: an electrode assembly 6 having a positive electrode and a negative electrode; a first conductive member connected to the positive electrode; and a second conductive member connected to the negative electrode accommodated in a case 4. The first conductive member includes a first contacting part that can be moved to the second conductive member side and can be contacted with the second conductive member. The second conductive member includes a second contacting part that can be moved to the first conductive member side and can be contacted with the first conductive member.

Description

  The technology disclosed in this specification relates to a power storage device.

  When a load is applied to the power storage device and the case of the power storage device is deformed, the positive electrode side member and the negative electrode side member may come into contact with each other inside the case, and the positive electrode and the negative electrode may be short-circuited. In particular, it is known that when an active material having a large electrical resistance comes into contact with another member, the amount of heat generated by a short circuit is large and the power storage device is likely to overheat. The power storage device of Patent Document 1 includes a case connected to the positive electrode (positive electrode side short circuit induction member) and a negative electrode side short circuit induction member connected to the negative electrode and the negative electrode terminal. The case and the short circuit induction member are opposed to each other with a gap formed in the vertical direction. The case and the short circuit induction member are formed of a material having low electrical resistance. When a downward load is applied to the case and the wall surface of the case moves downward, the case and the short-circuit induction member come into contact, and the electricity stored in the power storage device is discharged quickly while suppressing the amount of heat generation. And consume. Thereby, the possibility that the power storage device is overheated is reduced.

JP 2011-171297 A

  There are various modes of the load applied to the power storage device. In a power storage device including a short-circuit induction member, when a load of a certain aspect is applied, contact may not occur with a load of another aspect even if contact occurs in the short-circuit induction portion. For example, in the power storage device of Patent Document 1, when a downward load is applied to the case and the wall surface of the case moves downward, the case and the short-circuit induction member come into contact with each other. However, when a downward load is applied to the negative electrode terminal, both the negative electrode terminal and the short-circuit induction member move downward, and the short-circuit induction member moves away from the case. That is, in the conventional power storage device, when a load is applied to the power storage device, the short circuit is short-circuited only when one of the positive-electrode side and the negative-electrode side moves in the direction of the load, and the other short-circuit induction member Do not short-circuit when moving in the direction of the load.

  The present specification provides a technique for solving the above-described problems. In this specification, when a load is applied to the power storage device, the short circuit induction member on the positive electrode side moves in the direction of the load and the short circuit occurs both in the case where the short circuit induction member on the negative electrode side moves in the direction of the load. Provide a technology that can generate

  The present specification discloses a power storage device. In the power storage device, an electrode assembly having a positive electrode and a negative electrode, a first conductive member connected to the positive electrode, and a second conductive member connected to the negative electrode are accommodated in the case. The first conductive member has a first contact portion that is movable toward the second conductive member and that can contact the second conductive member. The second conductive member has a second contact portion that is movable to the first conductive member side and that can contact the first conductive member.

  In the above power storage device, for example, when a load is applied to the case and the first conductive member moves in the direction of the load, the first contact portion of the first conductive member moves to the second conductive member side. The second conductive member can be contacted. In addition, when the second conductive member moves in the direction of the load, like the first conductive member, the second contact portion of the second conductive member moves toward the first conductive member and contacts the first conductive member. can do. For this reason, the positive electrode and the negative electrode can be short-circuited in both cases described above.

  According to the power storage device disclosed in this specification, occurrence of a short circuit of the power storage device can be promoted.

1 is a front cross-sectional view illustrating an entire power storage device 2 of Example 1. FIG. 3 is an enlarged front cross-sectional view showing a short-circuit induction unit 60 of Example 1. FIG. FIG. 3 is an enlarged side cross-sectional view of the short-circuit induction unit 60 of Example 1 in the III-III cross section of FIG. 2. FIG. 6 is an enlarged front sectional view showing a short-circuit induction unit 70 of Example 2. FIG. 6 is a plan view showing the entire power storage device 2 of Example 3. FIG. 6 is an enlarged front cross-sectional view taken along a VI-VI cross section of FIG.

  Hereinafter, some technical features of the embodiments disclosed in this specification will be described. The items described below have technical usefulness independently.

(Feature 1) In the power storage device disclosed in the present specification, the first contact portion may have a first contact surface and a second contact surface. The second contact portion may have a third contact surface that faces the second contact surface and a fourth contact surface that faces the first contact surface.

  In said electrical storage apparatus, a 1st contact surface and a 4th contact surface can contact. Further, the second contact surface and the third contact surface can come into contact with each other. Thereby, generation | occurrence | production of the short circuit with a positive electrode and a negative electrode can be accelerated | stimulated.

(Characteristic 2) In the power storage device disclosed in the present specification, the first contact surface and the second contact surface of the first contact portion sandwich the third contact surface and the fourth contact surface of the second contact portion. May be located. The third contact surface and the fourth contact surface of the second contact portion may be positioned so as to sandwich the first contact surface and the second contact surface of the first contact portion.

  In the above power storage device, it is possible to make contact with one contact portion at positions on both sides of the other contact portion. Thereby, the power storage device can be saved.

(Characteristic 3) In the power storage device disclosed in the present specification, one of the first contact portion and the second contact portion has a tubular portion formed in a tubular shape, and the first contact portion and the second contact portion. The other has a rod-shaped portion formed in a rod shape, and the rod-shaped portion may be inserted into the cylindrical portion.

  In the above power storage device, the cylindrical portion surrounds the rod-shaped portion. For this reason, a cylindrical part and a rod-shaped part can contact in a some direction. Thereby, generation | occurrence | production of the short circuit with a positive electrode and a negative electrode can be accelerated | stimulated.

(Characteristic 4) In the power storage device disclosed in this specification, a bottom portion may be formed in the cylindrical portion, and a tip portion of the rod-shaped portion may be opposed to the cylindrical portion.

  In the above power storage device, the tip of the rod-shaped part and the bottom of the cylindrical part can be brought into contact with each other. Thereby, generation | occurrence | production of the short circuit with a positive electrode and a negative electrode can be accelerated | stimulated.

(Characteristic 5) In the power storage device disclosed in the present specification, of the first contact portion and the second contact portion, the contact portion having a contact surface located so as to sandwich the facing contact surface is a plate material. It may be formed by bending.

  In the above power storage device, productivity can be improved as compared with the case where the contact portion is formed by welding.

(Characteristic 6) In the power storage device disclosed in the present specification, the conductive member formed by bending the plate material is the first conductive member, and may be formed of aluminum.

  In the above power storage device, the productivity when bending the contact portion can be improved by utilizing the characteristics of aluminum suitable as a material for the member connected to the positive electrode.

(Feature 7) The power storage device disclosed in this specification may be a secondary battery.

  The power storage device 2 of the first embodiment is a secondary battery such as a nickel metal hydride battery or a lithium ion battery. The power storage device 2 is mounted on a vehicle such as a hybrid vehicle or an electric vehicle, and supplies power to the motor. In addition, the power storage device 2 is charged with electric power regenerated by the motor.

  FIG. 1 shows an overall configuration of a power storage device 2 according to the present embodiment. In the following examples, the up and down direction of the power storage device 2 refers to the up and down direction of FIG. 1, and the right and left direction of the power storage device 2 refers to the right and left direction of FIG. The front direction of the power storage device 2 refers to the front side of the paper in FIG. 1, and the rear direction of the power storage device 2 refers to the back direction of the paper in FIG.

  The power storage device 2 includes a case 4, an electrode assembly 6 accommodated in the case 4, and a positive terminal 12 a and a negative terminal 12 b provided in the case 4.

  The case 4 is made of metal and has a substantially rectangular parallelepiped shape. A positive terminal 12a is provided at the right end in FIG. 1 of the upper wall of the case 4, and a negative terminal 12b is provided at the left end in FIG. The positive electrode terminal 12a and the negative electrode terminal 12b are electrically connected to the positive electrode and the negative electrode, respectively, in the case 4 (described in detail later). A wiring member (not shown) for charging / discharging the power storage device 2 is connected to the positive electrode terminal 12a and the negative electrode terminal 12b.

The electrode assembly 6 is immersed in a liquid electrolyte in the case 4. The electrolytic solution contains a supporting salt containing a lithium salt in a solvent. For example, FEC (fluoroethylene carbonate) can be used as the solvent. As the supporting salt, for example, LiPF ₆ (lithium hexafluorophosphate) can be used.

  The electrode assembly 6 includes a positive electrode, a negative electrode, and a separator that insulates between the positive electrode and the negative electrode (not shown). The positive electrode and the negative electrode each have a metal foil and an active material layer formed on the metal foil. A positive electrode tab 55a extends from the positive metal foil, and a negative electrode tab 55b extends from the negative metal foil.

  As shown in FIG. 1, the positive terminal 12a includes a metal bolt 24a, an inner nut 26a, and an outer nut 28a. The bolt 24a and the inner nut 26a sandwich the case 4 via the seal washer 32a. The bolt 24a and the inner nut 26a are insulated from the case 4 by an insulator 30a. The outer nut 28a is used for connection with a wiring member.

  The negative electrode terminal 12b includes a metal bolt 24b, an inner nut 26b, and an outer nut 28b. The bolt 24b and the inner nut 26b sandwich the case 4 via the seal washer 32b. The bolt 24b and the inner nut 26b are insulated from the case 4 by an insulator 30b. The outer nut 28b is used for connection with a wiring member.

  As shown in FIG. 1, the positive electrode and the positive electrode terminal are connected by a first lead 10a, and the negative electrode and the negative electrode terminal 12b are connected by a second lead 10b. The first lead 10a constitutes a part of a first conductive member 162 described later. The second lead 10b constitutes a part of a second conductive member 167 described later. The first lead 10a is a flat conductive member. The first lead 10a is formed of a material having a low electrical resistance (for example, aluminum). The first lead 10 a extends substantially parallel to the upper end surface of the case 4. The lower surface of the center portion of the first lead 10a in the left-right direction in FIG. 1 is in contact with the upper end portion of the positive electrode tab 55a, both of which are fixed by welding and electrically connected. The right end of the first lead 10a is sandwiched and fixed between the inner nut 26a and the insulator 30a. For this reason, the 1st lead | read | reed 10a and the positive electrode terminal 12a are electrically connected.

  Similar to the first lead 10a, the second lead 10b is a flat conductive member. The second lead 10b is formed of a material having a low electrical resistance (for example, copper). The second lead 10 b extends substantially parallel to the upper end surface of the case 4. The lower surface of the center part in the left-right direction of the second lead 10b is in contact with the upper end part of the negative electrode tab 55b, and both are fixed by welding and are electrically connected. The left end of the second lead 10b is sandwiched and fixed between the inner nut 26b and the insulator 30b. Therefore, the second lead 10b and the negative electrode terminal 12b are electrically connected.

  As shown in FIG. 1, the positive electrode tab 55a, the 1st lead | lead 10a, and the positive electrode terminal 12a are connected in order, and the electricity supply path which connects a positive electrode and the positive electrode terminal 12a is formed. Similarly, by connecting the negative electrode tab 55b, the second lead 10b, and the negative electrode terminal 12b in this order, an energization path that connects the negative electrode and the negative electrode terminal 12b is formed. An insulating sheet 34 is disposed between the upper surfaces of the first lead 10 a and the second lead 10 b and the inner surface of the upper wall of the case 4.

  The power storage device 2 includes a short-circuit induction unit 60 at a position inside the upper wall of the case 4. The short-circuit induction unit 60 is provided between the upper wall of the case 4 and the positive electrode and the negative electrode. As will be described below, short circuit induction unit 60 induces a short circuit between the positive electrode and the negative electrode when a load is applied to power storage device 2 from the outside. Specifically, a short circuit between the positive electrode and the negative electrode is induced when a downward load is applied from the upper side of the power storage device 2.

  The short-circuit induction unit 60 includes a first conductive member 162 and a second conductive member 167. The first conductive member 162 includes the first lead 10 a described above and the first contact portion 62. The second conductive member 167 includes the above-described second lead 10 b and the second contact portion 67. The first contact portion 62 is formed of a material having a low electrical resistance (for example, aluminum), and the second contact portion 67 is formed of a material having a low electrical resistance (for example, copper). The first contact portion 62 is fixed to the end portion of the first lead 10a on the left side in FIG. 1, and the second contact portion 67 is fixed to the end portion of the second lead 10b on the right side in FIG. The first contact portion 62 and the second contact portion 67 are disposed close to each other at the center portion in the left-right direction inside the upper wall of the case 4. However, in the normal use state of the power storage device 2, the first contact portion 62 and the second contact portion 67 are not in contact with each other and are electrically insulated. When the first contact portion 62 and the second contact portion 67 come into contact with each other when a load is applied to the power storage device 2, the positive electrode and the negative electrode are short-circuited.

  As described above, the first and second contact portions 62 and 67 are disposed close to each other. For this reason, when a load is applied to the power storage device 2, the first contact portion 62 and the second contact portion 67 are easy to contact, and the positive electrode and the negative electrode are easily short-circuited. Here, the first and second leads 10a and 10b and the first and second contact portions 62 and 67 are formed of a material having low electrical resistance. Therefore, power storage device 2 can be discharged quickly while suppressing heat generation when the positive electrode and the negative electrode are short-circuited. Thereby, in the electrical storage apparatus 2 of a present Example, when the load is added to the electrical storage apparatus 2, the danger that the electrical storage apparatus 2 will generate | occur | produce heat | fever is suppressed.

  Below, the structure of the short circuit induction | guidance | derivation part 60 of a present Example is demonstrated in detail. As shown in FIG. 2, the first contact portion 62 has a cylindrical portion 62 formed in a bottomed cylindrical shape. The cylindrical portion 62 is disposed sideways so that the bottom 63 is positioned on the right side in FIG. 2 and the cylindrical portion 64 is positioned on the left side in FIG. The bottom 63 and the end of the first lead 10a on the left side in FIG. 2 are electrically connected.

  The 2nd contact part 67 has the rod-shaped part 67 formed in the rod shape. The rod-shaped part 67 is disposed sideways inside the cylindrical part 64 of the cylindrical part 62. As shown in FIG. 3, the rod-shaped portion 67 is located at the center of the space inside the tubular portion 62. The outer diameter of the rod-shaped part 67 is smaller than the inner diameter of the space inside the cylindrical part of the cylindrical part 62.

  A surface 64c facing upward on the lower side inside the cylindrical portion of the first contact portion 62 and a surface 67d facing downward on the lower side of the cylindrical surface of the second contact portion 67 are opposed to each other. A surface 64d that is located on the upper side inside the cylindrical portion 64 of the first contact portion 62 and faces downward is opposed to a surface 67c that is located on the upper side of the cylindrical surface of the second contact portion 67 and faces upward. .

  The upward surface 64c and the downward surface 64d, which are the two contact surfaces of the first contact portion 62, sandwich the downward surface 67d and the upward surface 67c, which are the two contact surfaces of the second contact portion 67. positioned.

  As described above, the positive electrode terminal 12a, the first lead 10a, and the first contact portion 62 are fixed to each other. Therefore, when a load is applied to the power storage device 2 and the case 4 is deformed, the positive terminal 12a, the first lead 10a, and the first contact portion 62 move together.

  For example, when a load is applied toward the inner side of the case 4 (downward) with respect to the upper end portion of the positive electrode terminal 12a, the first contact portion 62 moves downward. When the first contact portion 62 moves downward, the surface 64d of the first contact portion 62 and the surface 67c of the second contact portion 67 facing each other come into contact with each other. When the surface 64d and the surface 67c are in contact, the positive electrode, the first lead 10a, the first contact portion 62, the second contact portion 67, the second lead 10b, and the negative electrode are connected in order, and the positive electrode and the negative electrode are short-circuited. To do.

  Similarly, the negative electrode terminal 12b, the second lead 10b, and the second contact portion 67 are fixed to each other. Therefore, when a load is applied to the power storage device 2 and the case 4 is deformed, the negative electrode terminal 12b, the second lead 10b, and the second contact portion 67 move together.

  For example, when a load is applied toward the inside of the case 4 (downward) with respect to the upper end portion of the negative electrode terminal 12b, the second contact portion 67 moves downward. When the first contact portion 62 moves downward, the surface 67d of the second contact portion 67 and the surface 64c of the first contact portion 62 facing each other come into contact with each other. The contact between the surface 67d and the surface 64c causes a short circuit between the positive electrode and the negative electrode.

  In the short-circuit induction unit 60 of the power storage device 2 according to the present embodiment, the positive electrode and the negative electrode are both used when the first contact unit 62 moves downward and when the first contact unit 62 moves downward. Is short-circuited.

  For this reason, in the electrical storage apparatus 2 of a present Example, generation | occurrence | production of the short circuit in the short circuit induction | guidance | derivation part 60 when the load of a several different aspect is added to an electrical storage apparatus can be accelerated | stimulated. Thereby, the possibility that the power storage device 2 generates heat when a load is applied to the power storage device 2 can be reduced.

  Note that the power storage device 2 of the present embodiment is configured so that the positive electrode terminal 12a, the first lead 10a, and the first contact portion 62 are in contact with the negative electrode when a downward load is applied from above the power storage device 2. The first contact portion 62 may be designed to contact the second contact portion 67. In addition, when a downward load is applied from the upper side of the power storage device 2, the second contact portion 67 becomes the first contact portion 62 before the negative electrode terminal 12 b, the second lead, and the second contact portion 67 come into contact with the positive electrode. It may be designed to contact.

  As shown in FIG. 3, in the short circuit induction part 60 of the power storage device 2 of the present embodiment, a rod-like part 67 is arranged inside a cylindrical part 62. That is, the first contact portion 62 surrounds the second contact portion 67. For this reason, a short circuit between the positive electrode and the negative electrode occurs not only when the first contact portion 62 and the second contact portion 67 move in the front-rear direction of the power storage device 2 but also when the power storage device 2 moves in the vertical direction. can do. Therefore, in the power storage device 2 of the present embodiment, a short circuit can be generated even when a load is applied from the front-rear direction of the power storage device 2.

  As shown in FIG. 2, in the short circuit induction portion 60 of the power storage device 2 of the present embodiment, the left surface 63 f of the bottom 63 of the first contact portion 62 and the right end surface 67 e of the second contact portion 67 face each other. ing. For this reason, even when the 1st contact part 62 and the 2nd contact part 67 move to the left-right direction of the electrical storage apparatus 2, it can generate | occur | produce a short circuit with a positive electrode and a negative electrode.

  The correspondence between this embodiment and the claims will be described. In the present embodiment, the surface 64c facing the upper side of the first contact portion 62 is the “first contact surface” in the claims, and the surface 64d facing the lower side of the first contact portion 62 in the present embodiment is The surface 67c of the “second contact surface” in the claims facing the second contact portion 67 in the present embodiment is the second contact in the present embodiment of the “third contact surface” in the claims. The surface 67d facing the bottom of the portion 67 is an example of the “fourth contact surface” in the claims.

  In the above description, the case where the load is applied to the power storage device 2 is the upper end of the positive terminal 12a and the negative terminal 12b. However, the position where the load is applied to the power storage device 2 may be, for example, the upper wall of the case 2.

  In the above description, the power storage device 2 includes the short-circuit induction unit 60 at a position inside the upper wall of the case 4. Further, in the above description, the case where the positive electrode and the negative electrode are short-circuited when the first contact portion 62 and the second contact portion 67 move downward respectively has been described. However, the power storage device 2 may include the short-circuit induction unit 60 at any position of the case 4. In addition, the direction in which the first contact portion 62 and the second contact portion 67 move may be any direction. The short circuit induction part 60 is disposed inside the wall at any position of the case 4, and external force or the like is applied from the outside of the position where the short circuit induction part 60 of the case 4 is disposed toward the short circuit induction part 60. In this case, the positive electrode and the negative electrode may be short-circuited.

  As shown in FIG. 4, the short circuit induction | guidance | derivation part 70 of the electrical storage apparatus 2 of a present Example is comprised by the 1st conductive member 13a and the 2nd conductive member 13b. In the short circuit induction part 70, the end part on the left side in FIG. 4 of the first conductive member 13a and the end part on the right side in FIG. 4 of the second conductive member 13b are the central part in the left-right direction inside the upper wall of the case 4. Are arranged close to each other. The first conductive member 13a of this embodiment corresponds to a combination of the first lead 10a and the first contact portion 62 in the first embodiment, and the second conductive member 13b is the second lead in the first embodiment. This corresponds to a combination of 10b and the second contact portion 67.

  As shown in FIG. 4, the first conductive member 13 a has a flat part 71, a flat part 73, a flat part 75, a bent part 72, and a bent part 74. The flat portion 71 is located below the insulating sheet 34, and its upper surface is in contact with the lower surface of the insulating sheet 34. The right end portion of the flat portion 71 is connected to the positive electrode terminal 12a at a position not shown in the same manner as the right end portion of the first lead 10a of the first embodiment. A flat portion 73 is located below the flat portion 71, and a flat portion 75 is located below the flat portion 73. The flat portion 73 and the flat portion 75 are substantially parallel to the upper end surface of the case 4. The left end of the flat portion 71 and the left end of the flat portion 73 are connected by a bent portion 72. The right end of the flat portion 73 and the right end of the flat portion 75 are connected by a bent portion 74. The bent portion 72 and the bent portion 74 of the first conductive member 13a are formed by bending a flat plate.

  The second conductive member 13 b includes a flat portion 77, a flat portion 79, and a connecting portion 78 that connects the flat portion 77 and the flat portion 79. The left end portion of the flat portion 77 is connected to the negative electrode terminal 12b at a position not shown in the same manner as the left end portion of the second lead 10b of the first embodiment. The flat portion 79 is substantially parallel to the upper end surface of the case 4. The flat part 79 is located between the flat part 73 and the flat part 75 of the first conductive member 13a.

  In the present embodiment, the portion including the flat portion 73, the flat portion 75, the bent portion 72, and the bent portion 74 is an example of the “first contact portion” in the claims. The flat portion 79 is an example of the “second contact portion” in the claims.

  In the short circuit induction portion 70 of the present embodiment, the surface 75c facing upward on the upper side of the flat portion 75 of the first conductive member 13a and the surface facing downward on the lower side of the flat portion 79 of the second conductive member 13b. 79d is facing. Further, a surface 73d facing downward below the flat portion 73 of the first conductive member 13a and a surface 79c facing upward above the flat portion 79 of the second conductive member 13b face each other.

  In the short circuit induction part 70 of the present embodiment, when the first conductive member 13a moves downward, the surface 73d and the surface 79c come into contact with each other, and when the second conductive member 13b moves downward, The surface 79d and the surface 75c are in contact with each other.

  In the short circuit induction part 70 of the power storage device 2 of the present embodiment, the positive electrode and the negative electrode are both in the case where the first conductive member 13a is moved downward and the case where the second conductive member 13b is moved downward. Is short-circuited. For this reason, generation | occurrence | production of a short circuit can be accelerated | stimulated.

  As described above, the bent portions 72 and 74 of the first conductive member 13a of this embodiment are formed by bending. For this reason, productivity can be improved compared with the case where it forms by welding etc.

  In general, in a power storage device, aluminum is preferably used as a material for a member connected to the positive electrode. Also, productivity in aluminum bending is relatively good. In the present embodiment, the first conductive member 13a formed by bending is connected to the positive electrode of the positive and negative electrodes. For this reason, in the short circuit induction | guidance | derivation part 70 of the electrical storage apparatus 2 of a present Example, the productivity of the 1st conductive member 13a can be improved.

  The correspondence between this embodiment and the claims will be described. In the present embodiment, the surface 75c facing the upper side of the first conductive member 13a in the present embodiment faces the “first contact surface” in the claims of the first conductive member 13a in the present embodiment. The surface 73d is the “second contact surface” in the claims, and the surface 79c facing the second conductive member 13b in the present embodiment is the “third contact surface” in the present embodiment. The surface 79d facing the lower side of the second conductive member 13b is an example of the “fourth contact surface” in the claims.

  The short circuit induction | guidance | derivation part 90 of the electrical storage apparatus 2 of a present Example is comprised by the 1st conductive member 14a and the 2nd conductive member 14b. In the short-circuit induction portion 90, the end portion on the left side in FIG. 5 of the first conductive member 14a and the end portion on the right side in FIG. 5 of the second conductive member 14b are the central portion in the left-right direction inside the upper wall of the case 4. Are arranged close to each other. The first conductive member 14a of this embodiment corresponds to a combination of the first lead 10a and the first contact portion 62 in the first embodiment, and the second conductive member 14b is the second lead in the first embodiment. This corresponds to a combination of 10b and the second contact portion 67.

  As shown in FIGS. 5 and 6, the first conductive member 14 a connects the flat portion 91, the extending portion 93 located on the left side of the flat portion 91, and the flat portion 91 and the extending portion 93. And a bent portion 92. The second conductive member 14 b has a flat portion 95, an extending portion 97 located on the right side of the flat portion 95, and a bent portion 96 that connects the flat portion 95 and the extending portion 97. Yes. As shown in FIG. 5, the extension part 93 of the first conductive member 14a is located on the upper side of FIG. 5, the extension part 97 of the first conductive member 14a is located on the lower side of FIG. Is formed.

  As shown in FIG. 6, the extending portion 93 of the first conductive member 14a is located on the lower side of FIG. 6 with respect to the flat portion 95 of the second conductive member 14b. The extending portion 97 of the second conductive member 14b is located on the lower side in FIG. 6 with respect to the flat portion 91 of the first conductive member 14a. As shown in FIGS. 5 and 6, in a normal use state of the power storage device 2, the first conductive member 14 a and the second conductive member 14 b are not in contact with each other and are electrically insulated.

  As shown in FIG. 6, in the short circuit induction part 90, the surface 93c facing upward on the upper side of the extending part 93 of the first conductive member 14a and the lower side on the lower side of the flat part 95 of the second conductive member 14b. The facing surface 95d faces the surface 95d. Further, a surface 91d facing downward below the flat portion 91 of the first conductive member 14a and a surface 97c facing upward above the extending portion 97 of the second conductive member 14b are opposed to each other. .

  In the short circuit induction part 90 of the present embodiment, when the first conductive member 14a moves downward, the surface 91d and the surface 97c come into contact, and when the second conductive member 14b moves downward, The surface 95d and the surface 93c are in contact with each other. For this reason, generation | occurrence | production of a short circuit can be accelerated | stimulated.

  The correspondence between this embodiment and the claims will be described. The surface 93c facing the upper side of the first conductive member 14a in this embodiment is the “first contact surface” in the claims, and the surface 91d facing the lower side of the first conductive member 13a in this embodiment is the claim The surface 97c of the “second contact surface” in the section facing the second conductive member 14b in the present embodiment is the second conductive member in the present embodiment of the “third contact surface” in the claims. The surface 95d facing the lower side of 14b is an example of the “fourth contact surface” in the claims.

  Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. For example, each of the first contact portion and the second contact portion need not be configured by a single member. A plurality of members may be joined (fastened) or the like to form each contact surface, cylindrical portion, or rod-shaped portion. In addition, the technical elements described in the present specification or drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in the present specification or the drawings can achieve a plurality of objects at the same time, and has technical utility by achieving one of the objects.

2 Power storage device 4 Case 6 Electrode assembly 10a First lead 10b Second lead 12a Positive terminal 12b Negative terminal 60, 70, 90 Short-circuit induction portion 62 First contact portion 63 Bottom 63f, 64c, 64d, 67c, 67d, 67e, 73d, 75c, 79c,
79d Surface 67 Second contact portion 162, 13a, 14a First conductive member 167, 13b, 14b Second conductive member

Claims (8)

An electrode assembly having a positive electrode and a negative electrode;
A first conductive member connected to the positive electrode;
A second conductive member connected to the negative electrode is housed in the case;
The first conductive member has a first contact portion that is movable to the second conductive member side and that can contact the second conductive member;
The power storage device, wherein the second conductive member includes a second contact portion that is movable toward the first conductive member and that can contact the first conductive member. The first contact portion has a first contact surface and a second contact surface,
The power storage device according to claim 1, wherein the second contact portion includes a third contact surface that faces the second contact surface and a fourth contact surface that faces the first contact surface. The first contact surface and the second contact surface of the first contact portion are positioned so as to sandwich the third contact surface and the fourth contact surface of the second contact portion, or
The power storage device according to claim 2, wherein the third contact surface and the fourth contact surface of the second contact portion are positioned so as to sandwich the first contact surface and the second contact surface of the first contact portion. Either one of the first contact portion and the second contact portion has a tubular portion formed in a tubular shape,
The power storage device according to claim 3, wherein the other of the first contact portion and the second contact portion has a rod-like portion formed in a rod shape, and the rod-like portion is inserted into the cylindrical portion. The cylindrical part is formed with a bottom,
The power storage device according to claim 4, wherein the bottom portion and the tip end portion of the rod-shaped portion face each other.   4. The electricity storage device according to claim 3, wherein the contact portion of the first contact portion and the second contact portion having a contact surface located so as to sandwich the opposing contact surface is formed by bending a plate material. apparatus.   The power storage device according to claim 6, wherein the contact portion formed by bending the plate material is a first contact portion and is formed of aluminum.   The power storage device according to claim 1, wherein the power storage device is a secondary battery.

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