JP5747859B2 - Power storage device and vehicle - Google Patents

Description

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

  The power storage device stores electricity by charging, and drives the electric device by the stored electricity. For example, a power storage device is mounted on a hybrid vehicle or an electric vehicle and used for driving a motor. These power storage devices usually incorporate a current interrupt mechanism that interrupts current when an abnormality occurs. The current cutoff mechanism cuts off a current flowing between the connection terminal and the electrode assembly when the internal pressure of the power storage device abnormally increases. Patent Document 1 discloses a current interruption mechanism for a power storage device. The current interrupting mechanism includes a plate that separates a space inside the power storage device and a space communicating with the outside of the power storage device. The plate is provided with a safety valve, which is fixed to the current interrupter. The safety valve operates when the difference between the pressure in the space inside the power storage device and the pressure in the space outside the power storage device becomes equal to or greater than a set value. When the safety valve is activated, the current breaker fixed to the safety valve is broken, thereby interrupting the connection between the connection terminal and the electrode assembly.

Japanese Patent No. 4644483

  In the power storage device, it is preferable to reduce the electrical resistance of the current path between the connection terminal and the electrode assembly to reduce the electrical loss. In the conventional power storage device described above, the electrode assembly is connected to the current breaker via the positive electrode lid, the current breaker is connected to the center of the plate, and the periphery of the plate is connected to the cap cover (connection terminal). Yes. Therefore, the current flowing between the cap cover and the electrode assembly flows from the electrode assembly to the current breaker via the positive electrode lid, flows from the current breaker to the center of the plate, and flows from the center to the peripheral portion in the plate. Then, it flows from the peripheral edge of the plate to the connection terminal at the tip of the cap cover. That is, since a plate (a plate provided with a safety valve) is arranged on the cap cover side of the current breaker, the current path is formed so as to go around the space communicating with the plate and the outside of the power storage device. As a result, the current path becomes long and the electrical loss due to the electrical resistance is large.

  The present specification provides a technique for solving the above problems. The present specification provides a technique capable of reducing the electrical loss of a power storage device.

  The present specification discloses a power storage device. The power storage device includes a case, an electrode assembly housed in a housing space in the case, a current collecting member electrically connected to the electrode assembly, and a connection terminal fixed to the wall of the case. have. In addition, the power storage device includes a conductive member in which a connection region connected to the connection terminal is formed on one end side and the other end side is connected to the current collecting member. In the power storage device, the current collection member, the conductive member, and the connection terminal are electrically connected to form an energization path. The power storage device further includes a current interrupt device capable of interrupting the energization path in the case. In the power storage device, the current interrupt device is fixed to the case and has a recess and an opening, and is fixed to the support so as to cover the opening to form an isolation space in the recess. And a partition wall that is deformable by receiving the pressure of the housing space. In the current interrupting device, the partition wall is formed with a displacement region that is relatively displaceable with respect to the support and at least toward the isolation space as the partition wall is deformed. The conductive member is formed with an interlocking region that can be integrated with the displacement region and separable from the connection region. In the current interrupting device, the partition is deformed so as to receive the pressure of the accommodating space and displace the displacement region toward the isolation space, and the interlocking region is interlocked with the displacement of the displacement region. It is displaced to the space side, and the connection area and the interlocking area are separated to block the energization path. In the current interrupt device, the isolation space is disposed inside the case from the partition wall.

  In the above power storage device, the isolation space is arranged inside the case from the partition wall. For this reason, it is not necessary to arrange | position the electric current path which connects a current collection member and a connection terminal so that a partition and an isolation space may be wrapped. As a result, the current collecting member and the connection terminal can be connected with a short current path. For this reason, the electrical loss of an electrical storage apparatus can be made small.

It is a fragmentary sectional view which shows the state before electricity supply interruption | blocking of the electrical storage apparatus concerning 1st Example. It is a fragmentary sectional view which shows the state after electricity supply interruption | blocking of the electrical storage apparatus concerning 1st Example. It is a bottom view (figure seen from the case inner side) of the conductive member 61. It is sectional drawing which shows the state before the fracture | rupture of the electrically-conductive member 61. FIG. It is sectional drawing which shows the state after the fracture | rupture of the electrically-conductive member 61. FIG. It is a fragmentary sectional view which shows the state before electricity supply interruption | blocking of the electrical storage apparatus concerning a 2nd Example.

  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 this specification, the connection region includes a connection terminal surface that is a surface on the connection terminal side, and a connection partition wall surface that is the surface opposite to the connection terminal surface and is on the partition wall side. The region may have an interlocking terminal surface that is a surface on the connection terminal side, and an interlocking partition wall surface that is a surface opposite to the interlocking terminal surface and on the partition wall side. In the power storage device disclosed in this specification, a fragile portion may be formed between the connection region and the interlocking region.

  In the above power storage device, the connection region and the interlocking region are separated at the weak part, and thus are easily separated. Moreover, it is easy to stabilize the pressure when the energization path is interrupted. Thereby, the operation precision of a current interrupting device can be raised.

(Feature 2)
In the above power storage device, the conductive member may be plate-shaped. Moreover, the connection area | region may have the connection terminal surface which is the surface at the side of the said connection terminal, and the connection partition surface which is the surface on the opposite side to the said connection terminal surface and the said partition side. The interlocking area may include an interlocking terminal surface that is a surface on the connection terminal side, and an interlocking partition wall surface that is a surface opposite to the interlocking terminal surface and on the partition wall side. The connection terminal surface and the interlocking terminal surface are formed on the same plane, the connection partition wall surface and the interlocking partition surface are formed on the same plane, and the connection terminal surface and the connection partition surface are parallel to each other. It may be formed so as to. In the above power storage device, the weakened portion may be a triangular groove formed in the connection partition wall surface and the interlocking partition wall surface. In the above power storage device, when a virtual reference line orthogonal to both the connection terminal surface and the connection partition wall surface of the conductive member is defined, the triangular groove cut on the interlocking region side with respect to the virtual reference line The angle θ1 and the angle θ2 of the triangular groove on the connection region side with respect to the virtual reference line may satisfy the relationship θ1 ≦ θ2.

  In the above power storage device, the distance between each member after the conductive member is broken can be increased. For this reason, it is possible to more effectively prevent re-energization between the current collecting member and the connection terminal after energization interruption.

(Feature 3)
In the power storage device disclosed in this specification, an insulating material may be coated on at least one of the connection partition wall surface and the interlocking terminal surface.

  In the above power storage device, since at least one of the connecting partition wall surface and the interlocking terminal surface is coated with the insulating material, re-energization after energization interruption can be more effectively prevented.

(Feature 4)
In the power storage device disclosed in this specification, the power storage device may be a secondary battery.

  The power storage device 1 of the first embodiment is a secondary battery such as a nickel metal hydride battery or a lithium ion battery. The power storage device 1 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 1 is charged with electric power regenerated by the motor.

  As shown in FIG. 1, the power storage device 1 includes a case 2, an electrode assembly 3 accommodated in the case 2, a current collecting member 4, and a connection terminal 51 fixed to the case 2. The power storage device 1 includes a conductive member 61 that electrically connects the current collecting member 4 and the connection terminal 51. An energization path is formed in a state where the current collecting member 4 and the connection terminal 51 are electrically connected. In addition, the power storage device 1 includes a current interrupt device 6 that can interrupt the energization path.

  The case 2 is made of metal and has a substantially rectangular parallelepiped shape. An electrode assembly 3 and a current interrupting device 6 are accommodated in an internal space 22 of the case 2 (corresponding to an example of an accommodating space in the claims). A connection terminal 51 is provided on the upper end surface of the case 2. Specifically, a through hole 2 a is formed in the upper end surface of the case 2. An insulating terminal sleeve 52 is attached to the outer peripheral surface of the connection terminal 51. The connection terminal 51 is insulated from the case 2 by the terminal sleeve 52. The connection terminal 51 and the terminal sleeve 52 penetrate the through hole 2a. For this reason, the upper end of the connection terminal 51 is located outside the case 2, and the lower end of the connection terminal 51 is located inside the case 2. A male screw part 51 a is formed at the lower end of the connection terminal 51. The lower end of the connection terminal 51 is connected to the electrode assembly 3 via the conductive member 61. Note that the polarity of the connection terminal 51 may be either a positive electrode or a negative electrode. When the connection terminal 51 is a positive terminal, the negative terminal is installed at a position (not shown) of the case 2. When the connection terminal 51 is a negative electrode terminal, the positive electrode terminal is installed at a position (not shown) of the case 2.

  The electrode assembly 3 includes a positive electrode sheet, a negative electrode sheet, and a separator interposed between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet each have a current collector and an active material layer formed on the current collector. The current collecting member 4 is fixed to the positive electrode sheet or the negative electrode sheet. The current collecting member 4 is connected to the connection terminal 51 through the conductive member 61. The electrode assembly 3 is impregnated with a liquid electrolyte. The electrolyte contains an aromatic monomer additive. When an overvoltage is applied to the electrode assembly 3, the monomer additive contained in the electrolyte is polymerized to generate hydrogen gas. As a result, the pressure in the internal space 22 of the case 2 is increased.

  The current interrupt device 6 includes a support housing 72 and a partition wall 622 as a support. The support housing 72 is a container-like member and has a recess and an opening. Further, it is made of an insulating material. An upper end surface 72 a of the support housing 72 is fixed to the lower surface of the upper end surface of the case 2. A recess 72 c and a through hole 72 d are formed in the upper end surface 72 a of the support housing 72. The connection terminal 51 and the terminal sleeve 52 pass through the through hole 72d. An insulating gasket 53 attached to the outer peripheral surface of the terminal sleeve 52 is accommodated in the recess 72c. A gasket 53 provides a seal between the terminal sleeve 52 and the support housing 72.

  An isolation member 623 is disposed inside the support housing 72. The isolation member 623 is a bottomed cylindrical member and is made of metal. The bottom surface of the isolation member 623 is in contact with the lower end surface 72 b of the support housing 72, and the side surface of the isolation member 623 is in contact with the side surface 72 e of the support housing 72. The upper end of the separating member 623 is sealed with a partition wall 622 so as to cover the opening. By sealing the upper end of the isolation member 623 with the partition wall 622, the isolation space 26 and the communication space 24 are formed in the recess of the support housing 72. The isolation space 26 is isolated from the communication space 24 by the partition wall 622. As is apparent from the drawing, the isolation space 26 is disposed below the partition wall 622 (inside the case 2), and the communication space 24 is disposed above the partition wall 622 (on the upper end surface side of the case 2). . A communication hole 72 f is formed in the side surface 72 e of the support housing 72. The communication space 24 in the support housing 72 and the internal space 22 of the case 2 communicate with each other through the communication hole 72f.

  The partition wall 622 is a thin plate-like component having flexibility. The material of the partition 622 may be a resin as well as a metal. The peripheral part of the partition wall 622 is fixed to the upper end of the isolation member 623. The partition wall 622 can receive the pressure of the communication space 24 (accommodating space). Further, the partition wall 622 can be deformed according to the pressure difference between the communication space 24 and the isolation space 26. At this time, the displacement region 622c can be displaced toward the isolation space 26 along with the deformation of the partition wall 622. That is, the displacement region 622c can be displaced relative to the support housing. More specifically, when the pressures in the communication space 24 and the isolation space 26 are substantially the same, as shown in FIG. 1, the central portion of the partition wall 622 bulges to the communication space 24 side. On the other hand, when the pressure of the communication space 24 becomes larger than the pressure of the isolation space 26, as shown in FIG. 2, the central portion of the partition wall 622 bulges toward the isolation space 26, and the displacement region 622c is displaced toward the isolation space 26. (Blocking state).

  The conductive member 61 is a bent plate-like member, and is formed of a conductive metal. The conductive member 61 extends from the current collecting member 4 and then bends, and reaches the inside of the support housing 72 through the communication hole 72 f of the support housing 72. A first connection end 611 that is one end of the conductive member 61 is connected to the current collecting member 4. A second connection end 612 that is the other end of the conductive member 61 is connected to the connection terminal 51. In other words, a female thread portion 613 k is formed at the second connection end 612 of the conductive member 61. The female screw portion 51a of the connection terminal 51 is screwed and joined to the female screw portion 613k. Therefore, the electrode assembly 3 and the connection terminal 51 are connected by the current collecting member 4 and the conductive member 61. For this reason, the current flowing between the electrode assembly 3 and the connection terminal 51 flows from the electrode assembly 3 to the current collecting member 4, the conductive member 61, and the connection terminal 51 in this order.

  An interlocking region 613b that is joined to the displacement region 622c of the partition wall 622 and can be integrated with the displacement region 622c is formed on the first connecting end 611 side of the conductive member 61. Further, a connection region 613 c that is screwed into the connection terminal 51 is formed on the second connection end 612 side of the conductive member 61. As shown in FIG. 4, the connection region 613 c includes a connection terminal surface 613 r that is a surface on the connection terminal 51 side, and a connection partition wall surface 613 s that is a surface opposite to the connection terminal surface 613 r and a surface on the partition wall 622 side. . The interlocking region 613b includes an interlocking terminal surface 613p that is a surface on the connection terminal 51 side, and an interlocking partition wall surface 613q that is a surface opposite to the interlocking terminal surface 613p and a surface on the partition wall 622 side. The connection area 613c and the interlocking area 613b are formed continuously. The connection area 613c can be separated from the interlocking area 613b. Furthermore, the conductive member 61 has a fragile portion 613a at the boundary between the connection region 613c and the interlocking region 613b. As shown in FIG. 3, the fragile portion 613 a is formed on the lower surface of the conductive member 61 and is formed so as to surround the second connection end 612. The conductive member 61 is fixed to the partition wall 622 in the region 613m outside the fragile portion 613a. In this embodiment, since the conductive member 61 is plate-shaped, the connection terminal surface 613r, the interlocking terminal surface 613p, the connection partition wall surface 613s (excluding the triangular groove 613j portion), and the interlocking partition surface 613q (excluding the triangular groove 613j portion). ) Are formed on the same plane, and the respective terminal surfaces are parallel to the respective partition surfaces.

  As shown in FIG. 4, the fragile portion 613 a is configured by a triangular groove 613 j provided on the lower surface of the conductive member 61. The cut angle (θ2) on the second connection end 612 side (connection terminal 51 side) of the triangular groove 613j is larger than the cut angle (θ1) on the first connection end 611 side (current collecting member 4 side). ing. More specifically, when the virtual reference line L1 perpendicular to both the connection terminal surface 613r and the connection partition wall surface 613s of the conductive member 61 is defined, θ1 with respect to the virtual reference line L1 and θ2 with respect to the virtual reference line L1 are formed. The The relationship θ1 ≦ θ2 is satisfied. The insulating material 91 is coated on the surface 613g of the triangular groove 613j on the second connection end 612 side. In addition, the insulating material 91 is also coated on a part of the upper surface of the conductive member 61 613f above the surface 613n on the first connection end 611 side of the triangular groove 613j. In this embodiment, the surface 613g is a part of the connection partition wall surface 613s, and the surface 613f is a part of the interlocking terminal surface 613p. Here, the insulating material 91 may be coated on at least one of the connection partition wall surface 613s and the interlocking terminal surface 613p regardless of the presence or absence of the triangular groove 613j.

  In the secondary battery 1 as the power storage device described above, the pressure in the internal space 22 of the case 2 is normally less than a set value. However, when gas is generated by the operation of the secondary battery and the pressure in the internal space 22 of the case 2 is increased, the pressure in the communication space 24 in the support housing 72 is thereby increased. In some cases, the difference between the pressure in the communication space 24 and the pressure in the isolation space 26 exceeds the set value. In this case, as shown in FIG. 2, the partition wall 622 is deformed to bulge downward. As a result, the conductive member 61 is broken at the fragile portion 613a. As a result, the current path between the current collecting member 4 and the connection terminal 51 is disconnected, and the current does not flow from the state in which the current flows between the current collection member 4 and the connection terminal 51 (initial state) (blocking). State).

  Further, when the conductive member 61 breaks at the fragile portion 613a, the portion (interlocking region) 613b on the first connection end 611 side of the conductive member 61 moves downward, which is the direction in which gravity acts. When the interlocking region 613b moves downward, as shown in FIG. 5, a part of the upper surface 613f of the interlocking region 613b and the surface 613g of the second connection end 612 side (connection region) 613c face each other. It becomes the position to do. As described above, the surface 613f and the surface 613g, which are part of the upper surface, are each coated with the insulating material 91, so that the interlocking region 613b and the connection region 613c are prevented from conducting again.

  As is clear from the above, in the secondary battery 1 as the power storage device of the present embodiment, the communication space 24 is formed on the case side (outside) of the partition wall 622, and the isolation space 26 is on the opposite case side of the partition wall 622 ( It is formed on the inside. For this reason, it is not necessary to arrange the current path (that is, the conductive member 61) connecting the current collecting member 4 and the connection terminal 51 so as to go around the partition wall 622 and the isolation space 26 from below the isolation space 26. As a result, the current collecting member 4 and the connection terminal 51 can be connected with a short current path. For this reason, the electrical loss of the electrical storage apparatus 1 can be made small.

  Further, in the secondary battery 1 of the present embodiment, the conductive member 61 is a member different from the partition 622, and the conductive member 61 does not need to have a function as a partition (deformability according to pressure). Therefore, the conductive member 61 can be designed separately from the material and thickness of the partition wall 622. For this reason, the conductive member 61 can be designed to have sufficient conductivity, and as a result, the electrical loss of the power storage device 1 can be reduced.

  Further, in the secondary battery 1 of this embodiment, when the conductive member 61 breaks and the current flows from the state where the current flows to the state where the current does not flow, the member displaced by the break (that is, the interlocking region 613b of the conductive member 61) is displaced. The direction is the direction in which gravity acts (downward). This prevents the interlocking region 613b from being displaced again in the reverse direction. Thereby, the re-energization with the current collection member 4 and the connection terminal 51 can be prevented effectively.

  Further, in the secondary battery 1 of the present embodiment, when the conductive member 61 is broken and no current flows, a part of the upper surface 613f and the connecting partition wall surface 613s that face each other are electrically insulating materials. 91 is coated. By adopting such a configuration, re-energization can be more effectively prevented.

  Furthermore, in the secondary battery 1 of the present example, the cut angle (θ2) on the second connection end side (connection terminal side) of the triangular groove 613j forming the weakened portion 613a is the first connection end side (collection point). The angle is larger than the cut angle (θ1) on the electric member side. As is clear from FIG. 5, the distance D1 between the interlocking region 613b and the connection region 613c after breaking is larger than when the cut angle (θ2) is set to a small angle like the cut angle (θ1). For this reason, re-energization can be effectively prevented. Note that the distance D1 can be increased even when the cut angle (θ1) is set to be as large as the cut angle (θ2), but in this case, the electrical resistance of the conductive member 61 is increased. Therefore, by making the cut angle (θ2) larger than the cut angle (θ1), it is possible to prevent the electrical resistance from increasing while preventing the conductive member 61 from re-conducting.

  In the above-described embodiment, the current does not flow through the partition wall 622 that separates the isolation space 26 and the communication space 24, but the current flows through the conductive member 61. However, the technology disclosed in this specification is based on such a configuration. It is not limited to examples. For example, as shown in FIG. 6, the current collecting member 4 may be connected to the connection terminal 51 via the conductive member 615, the partition 622 b, and the conductive member 614. Even with such a configuration, it is not necessary to arrange the current path connecting the current collecting member 4 and the connection terminal 51 so as to go around the isolation space 26.

  In the above embodiment, the current interrupting device 6 interrupts the energizing path by breaking the conductive member 61, but the current interrupting device may interrupt the energizing path by other methods. For example, a current interrupting device in which the conductive member on the connection terminal side and the conductive member on the current collecting member side are switched from a contact state to a non-contact state according to a pressure difference between the isolation space and the communication space may be used.

  In the above embodiment, the case where the insulating material 91 is coated on each of the surface 613f and the surface 613g of the upper surface has been described. However, the insulating material 91 is coated only on one of these surfaces. May be.

  In the above embodiment, the fragile portion is a triangular groove, but the shape of the fragile portion groove is not limited. For example, an arc shape or a square shape may be used. Moreover, it is good also as a weak part by changing a material with the connection area | region 613c and the interlocking | linkage area | region 613b instead of a groove | channel, or changing plate | board thickness. In short, the weak part is a configuration for facilitating separation of the connection area 613c and the interlocking area 613b.

In the above embodiment, the displacement region 622c of the partition wall 622 is moved to the isolation space side with the deformation of the partition wall 622. For example, the partition wall 622 may be restored after the deformation. In this case, the displacement region 622c is also displaced so as to return to the place before the partition wall 622 is deformed.

  The power storage device can be mounted on a vehicle, for example. In this case, the power storage device may supply electric power to a motor for driving the vehicle.

  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. 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.

DESCRIPTION OF SYMBOLS 1 Power storage device 2 Case 22 Housing space 24 Communication space 26 Isolation space 3 Electrode assembly 51 Connection terminal 6 Current interruption device 61 Conductive member 613a Weak part 613b Interlocking area 613c Connection area 613j Triangular groove 613p Interlocking terminal surface 613q Interlocking partition wall surface 613r Connection Terminal surface 613s Connection partition surface 614 Conductive member (between connection terminal and partition)
615 Conductive member (between current collecting member and bulkhead)
622 Partition 622b Conductor partition 622c Displacement region 72 Support housing 91 Insulating material D1 Distance between members
L1 virtual reference line

Claims (5)

Case and
An electrode assembly housed in a housing space in the case;
A current collecting member electrically connected to the electrode assembly;
A connection terminal fixed to the wall of the case;
A connection region connected to the connection terminal is formed on one end side, and the other end side has a conductive member connected to the current collecting member,
An energization path is formed by electrically connecting the current collecting member, the conductive member, and the connection terminal,
Furthermore, a power storage device provided in the case with a current interrupt device capable of interrupting the energization path,
The current interrupt device is
A support fixed to the case and having a recess and an opening;
A partition wall fixed to the support so as to cover the opening, forming an isolation space in the recess, and deformable by receiving the pressure of the housing space,
The partition wall is formed with a displacement region that is relatively displaceable with respect to the support and at least on the side of the isolation space along with the deformation of the partition wall,
In the conductive member, an interlocking region that can be interlocked with the displacement region and separable from the connection region is formed,
The partition is deformed so as to receive the pressure of the housing space and displace the displacement region to the isolation space side, and the interlocking region is displaced to the isolation space side in conjunction with the displacement of the displacement region, And the connection area and the interlocking area are separated to interrupt the energization path,
The isolation space is disposed inside the case from the partition wall,
Power storage device. The connection region has a connection terminal surface that is a surface on the connection terminal side, a connection partition wall surface that is a surface opposite to the connection terminal surface, and a surface on the partition wall side,
The interlocking area has an interlocking terminal surface that is a surface on the connection terminal side, an interlocking partition wall surface that is a surface opposite to the interlocking terminal surface, and is a surface on the partition wall side,
The power storage device according to claim 1, wherein a weak portion is formed between the connection region and the interlocking region. The conductive member is plate-shaped,
The connection region has a connection terminal surface that is a surface on the connection terminal side, a connection partition wall surface that is a surface opposite to the connection terminal surface, and a surface on the partition wall side,
The interlocking area has an interlocking terminal surface that is a surface on the connection terminal side, an interlocking partition wall surface that is a surface opposite to the interlocking terminal surface, and is a surface on the partition wall side,
The connection terminal surface and the interlocking terminal surface are formed on the same plane, the connection partition wall surface and the interlocking partition surface are formed on the same plane, and the connection terminal surface and the connection partition surface are parallel to each other. Formed to
The fragile portion is a triangular groove formed in the connection partition wall surface and the interlocking partition wall surface,
When defining a virtual reference line orthogonal to both the connection terminal surface of the conductive member and the connection partition wall surface, θ1 is a cut angle of the triangular groove on the interlocking region side with respect to the virtual reference line,
Θ2 which is a cut angle of the triangular groove on the connection region side with respect to the virtual reference line is
The power storage device according to claim 2, satisfying a relationship of θ1 ≦ θ2. The power storage device according to claim 2 or claim 3, wherein an insulating material is coated on at least one of the connection partition wall surface and the interlocking terminal surface.   The power storage device according to any one of claims 1 to 3, wherein the power storage device is a secondary battery.

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