JP2013134899A - Battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery capable of inhibiting lead parts from entering an electrode bundle even when the lead parts are deformed by impact from the outside.SOLUTION: Lead parts 32, 42 connected to one of a positive electrode plate 21 and a negative electrode plate 22 of an electrode bundle 20 include blade parts 33, 43 extended so as to cover a part of a positive electrode surface 20a or a negative electrode surface 20b while securing an insertion part 100 formed by exposing the positive electrode surface 20a or the negative electrode surface 20b of the electrode bundle 20.

Description

  The present invention relates to a structure of a battery mounted on a vehicle such as an automobile.

  Conventionally, for example, non-aqueous electrolyte secondary batteries represented by nickel metal hydride secondary batteries and lithium ion secondary batteries are known as secondary batteries for relatively small electronic devices such as mobile phones and personal computers. Yes. In recent years, development of large-sized batteries mounted on various vehicles such as electric vehicles has been progressing.

  As a structure of such a battery, for example, an electrode group (electrode bundle) laminated by winding a positive electrode plate and a negative electrode plate through a separator is formed into a rectangular exterior member (case) together with a non-aqueous electrolyte. Some are housed inside and the exterior member is sealed with a lid member (see, for example, Patent Document 1).

  The positive electrode plate and the negative electrode plate are respectively connected to one end side of the current collector at the axial end of the electrode group, and the other end side of the current collector is connected to a terminal portion provided on the lid member. For example, in the configuration described in Patent Document 1, the positive electrode plate and the negative electrode plate are connected to the positive electrode terminal and the negative electrode terminal corresponding to the terminal portion by the positive electrode lead and the negative electrode lead corresponding to the current collector. The positive electrode lead and the negative electrode lead have a connection plate connected to the terminal portion and a strip-shaped current collector extending downward from the connection plate, and the current collector is connected to the positive electrode plate or the negative electrode plate. Has been. And this current collection part is extended toward the downward direction from the connection plate so that it may become substantially parallel to the surface of an electrode group.

  As described in Patent Document 1, the strip-shaped current collecting part (lead part) extends from the connection plate so as to be substantially parallel to the surface of the electrode group (electrode bundle).

JP 2011-71109 A JP 2002-298906 A

  By the way, when such a battery is mounted in a vehicle, there is a possibility that a large impact is applied to the battery from the outside, for example, when the vehicle collides. In the configuration in which the lead portion extends substantially parallel to the surface of the electrode bundle as described above, when an impact is applied to the battery from the outside of the lead portion, the lead portion is deformed inward and enters the electrode bundle. There is a possibility that an internal short circuit may occur due to contact with the positive electrode plate or the negative electrode plate.

  In the secondary battery having a structure in which the positive electrode current collector plate is welded to the end portion of the positive electrode protruding from the electrode bundle, at least the outermost peripheral portion of the positive electrode end portion (lead welding end portion) protruding from the electrode bundle There is one in which the angle is inclined to the inner peripheral side (see Patent Document 2).

  In this configuration, it is possible to suppress the occurrence of an internal short circuit due to the end of the positive electrode coming into contact with the inner wall of the container that also serves as the negative electrode terminal. However, the configuration described in Patent Document 2 does not suppress an internal short circuit accompanying the deformation of the current collector.

  The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a battery capable of suppressing entry of the lead portion into the electrode bundle even when the lead portion is deformed by an external impact. And

  A first aspect of the present invention that solves the above problems is a wound body in which a positive electrode plate and a negative electrode plate are offset laminated via a separator to form a laminate, and the laminate is formed by winding the laminate in a cylindrical shape. An electrode bundle having one end surface as a positive electrode surface and the other end surface as a negative electrode surface, and disposed corresponding to either the positive electrode surface or the negative electrode surface of the electrode bundle, and is either the positive electrode plate or the negative electrode plate A lead portion connected to the lead portion, the lead portion extending so as to cover a part of the positive electrode surface or the negative electrode surface while ensuring an insertion portion where the positive electrode surface or the negative electrode surface is exposed. There is provided a battery having a blade portion.

  In such a first aspect, even if an impact (external force) is applied from the side of the exterior member and the lead portion is deformed to the electrode bundle side, the blade portion is substantially in surface contact with the positive electrode surface or the negative electrode surface of the electrode bundle. As a result, the movement of the lead portion toward the electrode bundle is restricted. Therefore, the entry of the lead portion into the electrode bundle can be suppressed.

  According to a second aspect of the present invention, in the battery of the first aspect, a plurality of lead portions connected to the same polarity are provided, and the blade portions are continuously provided across the plurality of lead portions. The battery is characterized by the following.

  In the second aspect, the deformation of the lead portion is more reliably suppressed.

  According to a third aspect of the present invention, in the battery according to the first or second aspect, the battery further includes an exterior member that accommodates the electrode bundle and the lead portion, and the exterior member faces the surface of the electrode bundle. The battery is characterized in that it is provided with a deformation restricting portion that protrudes from an inner wall surface between the lead portion and the electrode bundle and restricts deformation of the lead portion toward the electrode bundle.

  In the third aspect, the lead portion abuts against the deformation restricting portion, whereby the lead portion can be more reliably suppressed from entering the electrode bundle.

  According to a fourth aspect of the present invention, in the battery according to the third aspect, the deformation restricting portion is formed such that an angle of a surface facing the lead portion with respect to an inner wall surface of the exterior member is an acute angle. The battery is characterized by the following.

  In the fourth aspect, when the lead portion is deformed, the lead portion is deformed along the deformation restricting portion, so that the lead portion is more reliably prevented from entering the electrode bundle.

  In the present invention, even when the lead portion of the current collector is deformed by an impact from the outside, the lead portion can be prevented from entering the electrode bundle by contacting the blade portion. Therefore, it is possible to suppress the occurrence of an internal short circuit due to the current collector contacting the positive electrode plate or the negative electrode plate. Moreover, since the insertion part is ensured, a positive electrode plate, a negative electrode plate, and a lead part can be connected favorably.

It is a disassembled perspective view which shows schematic structure of the sealed battery which concerns on Embodiment 1 of this invention. It is a longitudinal cross-sectional view which shows schematic structure of the sealed battery which concerns on Embodiment 1 of this invention. It is the schematic which shows the laminated structure of an electrode bundle. It is a cross-sectional view which shows schematic structure of the sealed battery which concerns on Embodiment 1 of this invention. It is a longitudinal cross-sectional view of the sealed battery explaining the state at the time of the deformation | transformation of the lead part of an electrical power collector. It is the schematic which shows an example of the usage condition of the battery which concerns on this invention. It is the schematic which shows an example of the usage condition of the battery which concerns on this invention. It is a cross-sectional view of the sealed battery which shows the modification of the blade | wing part which concerns on this invention. It is a cross-sectional view which shows the modification of the sealed battery which concerns on Embodiment 1 of this invention. It is a cross-sectional view of a sealed battery showing a modification of the deformation restricting portion according to the present invention. It is a disassembled perspective view which shows schematic structure of the sealed battery which concerns on Embodiment 2 of this invention. It is a cross-sectional view which shows the modification of the sealed battery which concerns on Embodiment 2 of this invention.

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

(Embodiment 1)
A battery 10 according to this embodiment shown in FIGS. 1 and 2 is, for example, a sealed battery that is a lithium ion battery, and includes an electrode bundle (element) 20 including a positive electrode plate 21 and a negative electrode plate 22, and a current collector 30. , 40 are accommodated in a battery case 50 as an exterior member together with a non-aqueous electrolyte (not shown). The upper part of the battery case 50 is sealed with a lid member 60. An insulating member 55 that covers the inner surface of the battery case 50 is provided in the battery case 50. Thereby, the battery case 50 is insulated from the electrode bundle 20 and the current collectors 30 and 40 accommodated therein.

  As will be described in detail later, one end side of the current collector 30 is connected to the positive electrode plate 21 of the electrode bundle 20, and the other end side of the current collector 30 is connected to the outside through a through hole 61 provided in the lid member 60. A protruding positive terminal member 70 is connected. One end of a current collector 40 is connected to the negative electrode plate 22. The other end side of the current collector 40 is connected to a negative electrode terminal member 80 that protrudes to the outside from a through hole 61 provided in the lid member 60.

  Insulating sheet members 90 are respectively disposed on the upper and lower surfaces of the lid member 60 so as to correspond to the openings of the through holes 61. The positive electrode terminal member 70 and the negative electrode terminal member 80 are insulated from the lid member 60 by the insulating sheet member 90.

  As shown in FIG. 3, in the electrode bundle 20, for example, a positive electrode plate 21 and a negative electrode plate 22 made of metal foil are offset stacked via a separator 23 to form a stacked body. Then, one end face of the wound body formed by winding the laminate in a cylindrical shape is a positive electrode surface 20a and the other end surface is a negative electrode surface 20b (see FIG. 1). The electrode bundle 20 according to the present embodiment is formed by winding a belt-like positive electrode plate 21 and a negative electrode plate 22 into a flat shape via a separator 23.

  Further, the strip-like positive electrode plate 21 is formed with an active material application part 25 to which an active material is applied, except for the non-application part 24 provided at one end in the width direction. Similarly, the negative electrode plate 22 is also provided with an active material application part 27 except for the non-application part 26. That is, the active material application part 25 is formed in the part which overlaps with the negative electrode plate 22 of the positive electrode plate 21, and the active material application part 27 is formed in the part which overlaps with the positive electrode plate 21 of the negative electrode plate 22.

  As shown in FIG. 4, a positive electrode binding portion 28 in which non-application portions 24 of a plurality of positive electrode plates 21 are bundled is formed on one end side in the width direction (left and right direction in the drawing) of the electrode bundle 20, that is, on the positive electrode surface 20 a side. Is formed. On the other end side in the width direction of the electrode bundle 20, that is, on the negative electrode surface 20 b side, a negative electrode binding portion 29 in which the non-application portions 26 of the plurality of negative electrode plates 22 are bundled is formed. The positive electrode binding portion 28 and the negative electrode binding portion 29 are bound by, for example, a substantially U-shaped binding member (not shown). The electrode bundle 20 according to the present embodiment is provided with two positive electrode binding portions 28 and two negative electrode binding portions 29. In addition, the number of the positive electrode binding parts 28 and the negative electrode binding parts 29 is not specifically limited, Each may be one and may be three or more.

  A current collector 30 is connected to each positive electrode binding portion 28 of the electrode bundle 20, and a current collector 40 side is connected to each negative electrode binding portion 29. The current collectors 30, 40 are plate-like terminal connection portions 31, 41 provided facing the lid member 60, and lead portions extending from the terminal connection portions 31, 41 facing the surface of the electrode bundle 20. 32, 42.

  The terminal connection portion 31 of the current collector 30 is connected to a positive electrode terminal member 70 that protrudes outside the lid member 60. The terminal connection portion 41 of the current collector 40 is connected to a negative electrode terminal member 80 that protrudes outside the lid member 60. Since the connection structure between the terminal connection portion 31 and the positive electrode terminal member 70 and the connection structure between the terminal connection portion 41 and the negative electrode terminal member 80 may be an existing structure, a detailed description of this point is omitted. To do.

  The lead portion 32 of the current collector 30 extends so as to face the surface of the electrode bundle 20, specifically, the surface of the positive electrode binding portion 28, and is connected to the outer surface of the positive electrode binding portion 28. . The lead portion 42 of the current collector 40 extends so as to face the surface of the negative electrode binding portion 29 and is connected to the outer surface of the negative electrode binding portion 29.

  In the present embodiment, the electrode bundle 20 includes two positive electrode binding portions 28 and two negative electrode binding portions 29. Therefore, the current collector 30 includes two lead portions 32 corresponding to the two positive electrode binding portions 28. Similarly, the current collector 40 includes two lead portions 42 corresponding to the two negative electrode binding portions 29. Specifically, the lead portion 32 of the current collector 30 is bifurcated from the terminal connection portion 31 with a predetermined width, and is extended to face the outer surface of each positive electrode binding portion 28. The lead portion 42 of the current collector 40 is bifurcated from the terminal connection portion 41 with a predetermined width, and is extended to face the outer surface of each negative electrode binding portion 29.

  In addition, each lead part 32 and 42 and the positive electrode binding part 28 or the negative electrode binding part 29 are connected by ultrasonic welding, for example. Of course, the joining method of each lead part 32 and 42 and the positive electrode binding part 28 or the negative electrode binding part 29 is not specifically limited.

  Here, the lead portion 32 of the current collector 30 includes a blade portion 33 extending so as to cover a part of the positive electrode surface 20a while securing the insertion portion 100 where the positive electrode surface 20a is exposed. In this embodiment, as shown in FIG. 1 and FIG. 4B, the blade portion 33 is provided at the tip of the lead portion 32 so as to face the positive electrode surface 20 a of the electrode bundle 20, and the insertion portion 100 is the lead portion 32. It is ensured on the base end side with respect to the blade portion 33. Similarly, the blade portion 43 is also provided at the distal end portion of the lead portion 42 of the current collector 40 so as to oppose the negative electrode surface 20 b, and the insertion portion 100 is secured on the base end side from the blade portion 43 of the lead portion 42. ing. In addition, these blade portions 33 and 43 are extended from the outer end portions (on the battery case 50 side) of the lead portions 32 and 42 toward the center in the thickness direction of the electrode bundle 20.

  The insertion portion 100 is a connection operation between the positive electrode plate 21 or the negative electrode plate 22 and the lead portions 32 and 42. In this embodiment, the positive electrode binding portion 28 or the negative electrode binding portion 29 and the lead portions 32 and 42 are ultrasonically welded. The part which exposed the positive electrode surface 20a or the negative electrode surface 20b in order to perform the operation | work which connects by this.

  Thus, by providing the blade portions 33 and 43 on the lead portions 32 and 42 of the current collectors 30 and 40, when an impact (external force) is applied from the side of the battery case 50, internal short-circuiting occurs. Occurrence can be suppressed. For example, as shown in FIG. 5, when an external force is applied from the side of the battery case 50 and the lead portion 32 is pressed toward the electrode bundle 20, the blade portion 33 of the lead portion 32 substantially contacts the end surface of the electrode bundle 20. Surface contact. As a result, the movement of the lead portion 32 toward the electrode bundle 20 is restricted.

  In the case of the present embodiment, first, the blade portions 33 and 43 are in surface contact with the positive electrode binding portion 28 and the negative electrode binding portion 29, so that deformation of the lead portions 32 and 42 is suppressed. When the blade portions 33 and 43 are further deformed, the blade portions 33 and 43 are deformed together with the positive electrode binding portion 28 and the negative electrode binding portion 29 to come into surface contact with the end face of the electrode bundle 20 including the separator 23. Thereby, the movement of the lead part 32 to the electrode bundle 20 side is effectively restricted. That is, in the configuration of the present embodiment, the deformation of the lead portions 32 and 42 can be effectively suppressed in two stages. Accordingly, the lead portion 32 can be prevented from entering the electrode bundle 20. As a result, the occurrence of an internal short circuit in the battery 10 can be suppressed.

  Furthermore, since the insertion part 100 is ensured, each lead part 32 and 42 and the positive electrode binding part 28 or the negative electrode binding part 29 can be connected easily, and the productivity of the battery 10 is improved. Furthermore, since the battery 10 is square in this embodiment, space efficiency is high.

  For example, as shown in FIG. 6A, a plurality of (for example, about 5 to 8) batteries 10 that are square sealed batteries are collectively stored in a small case 110 and modularized. . Furthermore, a plurality of small cases 110 are housed side by side in a large case (casing) 120 that is composed of a battery tray 121 and a battery cover 122 and has a larger volume than the small case 110 to form a battery pack 130. That is, in the battery pack 130, the battery 10 is stored in a double case structure of the small case 110 and the large case 120. As shown in FIG. 6B, the battery pack 130 is mounted on a vehicle 200 such as an electric vehicle. Therefore, if the battery 10 is square, the dead space can be minimized and the space efficiency can be improved.

  The arrangement of the battery pack 130 is not particularly limited. The battery pack 130 is attached under the floor in the vicinity of the center of the vehicle 200 in consideration of, for example, lowering the center of gravity of the vehicle 200 to improve the motion performance of the vehicle 200 and securing a vehicle interior space (FIG. 6B). reference). Alternatively, the battery pack 130 may be attached to the trunk room at the rear of the vehicle 200 in consideration of lowering the overall vehicle height of the vehicle 200, convenience in the passenger compartment of the vehicle 200, and the like.

  Furthermore, the direction of the battery 10 with respect to the vehicle 200 is not particularly limited. For example, the battery 10 may be provided such that the longitudinal direction thereof coincides with the front-rear direction of the vehicle 200, or may be provided such that the longitudinal direction thereof coincides with the vertical direction of the vehicle 200. Good. In any case, it is preferable to efficiently arrange the dead space so as to reduce the dead space in consideration of various conditions such as securing the cabin space of the vehicle 200 and lowering the center of gravity of the vehicle 200.

  When the arrangement of the battery 10 is appropriately determined in consideration of various conditions as described above, the current collectors 30 and 40 may be arranged outward with respect to the center of the vehicle 200. That is, as shown in FIG. 7A, the batteries 10 may be arranged so that the positive electrode surface 20a and the negative electrode surface 20b side of the electrode bundle 20 face the outside in the left-right direction of the vehicle, or FIG. ), The battery 10 may be arranged such that the positive electrode surface 20a and the negative electrode surface 20b of the electrode bundle 20 face the outside in the front-rear direction of the vehicle. If the battery 10 is arranged in such a direction, for example, when the vehicle 200 collides and an external force is applied to the battery 10, a short circuit due to deformation of the lead portions 32 and 42 is likely to occur. However, according to the configuration of the present invention, it is possible to effectively suppress a short circuit due to the deformation of the lead portions 32 and 42 regardless of the orientation of the battery 10 with respect to the vehicle 200.

  Further, when an external force is applied from the side of the battery case 50, the lead portions 32 and 42 are often deformed starting from the base end portions thereof, that is, the vicinity of the boundary with the terminal connection portions 31 and 41. For this reason, the deformation amount (movement amount) of the lead portions 32 and 42 toward the electrode bundle 20 tends to be the largest at the tip portions of the lead portions 32 and 42. That is, the tip portions of the lead portions 32 and 42 are most likely to enter the electrode bundle 20. In the present embodiment, blade portions 33 and 43 are provided at the tip portions of the lead portions 32 and 42. Accordingly, it is possible to more reliably suppress the lead portions 32 and 42 from entering the electrode bundle 20.

  In the present embodiment, the blade portions 33 and 43 are extended from the lead portions 32 and 42 toward the center in the thickness direction of the electrode bundle 20. For example, as shown in FIG. , 42 may also be provided with blade portions 33, 43 on the outer side in the thickness direction of the electrode. Thereby, when the lead portions 32 and 42 are deformed, the blade portions 33 and 43 more reliably come into surface contact with the end face of the electrode bundle 20. Therefore, it is possible to more reliably suppress the lead portions 32 and 42 from entering the electrode bundle 20.

  Further, as shown in FIG. 9, a deformation restricting portion 52 that restricts deformation of the lead portions 32 and 42 toward the electrode bundle 20 is formed on the inner wall surface 51 of the battery case 50 facing the surface 20 c of the electrode bundle 20. Projections may be provided corresponding to the respective lead portions 32 and 42 of 30,40. For example, in the present embodiment, the current collectors 30 and 40 include two lead portions 32 and 42, respectively. Therefore, the battery case 50 includes four deformation restricting portions 52 corresponding to the lead portions 32 and 42. Is preferably provided. The deformation restricting portion 52 is projected between the lead portions 32 and 42 and the electrode bundle 20 from the inner wall surface of the battery case 50 facing the surface of the electrode bundle 20. That is, the deformation restricting portion 52 is provided in the vicinity of the end portion in the width direction of the electrode bundle 20 so as to protrude to a position where the inner end faces of the lead portions 32 and 42 face each other.

  By providing such a deformation restricting portion 52, even when an impact (external force) is applied from the side of the battery case 50, the occurrence of an internal short circuit can be more reliably suppressed. For example, when an external force is applied from the side of the battery case 50 and the lead part 32 is pressed toward the electrode bundle 20, the lead part 32 comes into contact with the deformation restricting part 52, so that the lead part 32 faces the electrode bundle 20. Movement is restricted. That is, when the lead part 32 contacts the deformation restricting part 52, the deformation of the lead parts 32 and 42 toward the electrode bundle 20 is restricted. Accordingly, it is possible to further reliably prevent the lead portions 32 and 42 from entering the electrode bundle 20.

  In the present embodiment, since the blade portions 33 and 43 are extended from the outer end portions of the lead portions 32 and 42, the lead portions 32 and 42, the positive electrode binding portion 28, the negative electrode binding portion 29, and Are connected by ultrasonic welding or the like, the blade portions 33 and 43 do not interfere with the positive electrode binding portion 28 or the negative electrode binding portion 29. Further, the insertion portion 100 is secured on the base end side of the blade portions 33 and 43 of the lead portions 32 and 42, thereby connecting the positive electrode binding portion 28 or the negative electrode binding portion 29 and the lead portions 32 and 43. It can be done easily. Therefore, the lead parts 32 and 42 and the positive electrode binding part 28 or the negative electrode binding part 29 can be satisfactorily connected.

  Furthermore, in the above-described example, the deformation restricting portion 52 is provided so that the facing surface 52a facing the inner end surface of the lead portions 32 and 42 is substantially orthogonal to the inner wall surface of the battery case 50. As shown in FIG. 10, the angle θ of the facing surface 52 a with respect to the inner wall surface of the battery case 50 may be provided to be an acute angle.

  Even if the deformation restricting portion 52 has such a configuration, deformation of the lead portions 32 and 42 toward the electrode bundle 20 can be restricted. For example, when the lead portion 32 is pressed toward the electrode bundle 20, the lead portion 32 contacts the opposing surface 52 a of the deformation restricting portion 52 and then deforms along the opposing surface 52 a. That is, the lead portions 32 and 42 are guided by the deformation restricting portion 52 and deformed toward the outside of the electrode bundle 20 without going to the electrode bundle 20. As described above, the movement direction of the lead portions 32 and 42 is guided by the deformation restricting portion 52, so that the deformation of the lead portions 32 and 42 toward the electrode bundle 20 is restricted. Accordingly, it is possible to further reliably prevent the lead portions 32 and 42 from entering the electrode bundle 20.

(Embodiment 2)
The battery 10A according to the present embodiment shown in FIG. 11 has the same configuration as that of the first embodiment except that the configurations of the blade portions 33 and 43 provided in the lead portions 32 and 42 of the current collectors 30 and 40 are different. The same reference numerals are assigned to the same members, and duplicate descriptions are omitted.

  The blade portion 33 </ b> A according to the present embodiment is provided continuously between the two lead portions 32 of the current collector 30. That is, the two lead portions 32 of the current collector 30 are integrated by connecting the tip portions thereof with the blade portions 33A. Similarly, the tip portions of the two lead portions 42 of the current collector 40 are connected and integrated by a blade portion 43A.

  With such a configuration, when the lead portions 32 and 42 are deformed to the electrode bundle 20 side, the blade portions 33A and 43A are surely brought into surface contact with the end face of the electrode bundle 20 so that the inside of the electrode bundle 20 of the lead portion 32 Entry to is suppressed. Also in the configuration of the present embodiment, since the insertion portion 100 is secured on the base end side of the blade portions 33 and 43 of the lead portions 32 and 42, the lead portions 32 and 42 and the positive electrode binding portion 28 or the negative electrode binding portion are secured. The part 29 can be connected well.

  Further, the tip portions of the lead portions 32 and 42 are connected and integrated by the blade portions 33A and 43A, so that the deformation restricting portion 52 is connected to each of the current collectors 30 and 40 as shown in FIG. It is sufficient that one is provided for each. That is, it is only necessary that the deformation restricting portion 52 is provided corresponding to one of the lead portions 32 and 42 of the current collectors 30 and 40. Even in such a configuration, the lead portions 32 and 42 abut against the deformation restricting portion 52, so that deformation of the lead portions 32 and 42 toward the electrode bundle 20 can be suppressed. Furthermore, since the volume of the battery case 50 is expanded by reducing the number of deformation restricting portions 52, it is possible to suppress a decrease in volumetric efficiency of the battery 10A.

  As mentioned above, although embodiment of this invention was described, of course, this invention is not limited to the above-mentioned embodiment. The present invention can be modified as appropriate without departing from the spirit of the present invention.

  For example, in the above-described embodiment, a rectangular sealed battery is illustrated as an example of the battery. However, the present invention can be applied to a battery having another structure, for example, a cylindrical battery.

DESCRIPTION OF SYMBOLS 10 Battery 20 Electrode bundle 20a Positive electrode surface 20b Negative electrode surface 20c Surface 21 Positive electrode plate 22 Negative electrode plate 23 Separator 24,26 Non-application part 25,27 Active material application part 28 Positive electrode binding part 29 Negative electrode binding part 30,40 Current collector 31, 41 Terminal connection portion 32, 42 Lead portion 33, 43 Blade portion 50 Battery case 51 Inner wall surface 52 Deformation restricting portion 52a Opposing surface 55 Insulating member 60 Lid member 61 Through hole 70 Positive electrode terminal member 80 Negative electrode member 90 Insulating sheet member 100 Insertion Part 110 Small case 120 Large case 121 Battery tray 122 Battery cover 130 Battery pack 200 Vehicle

Claims (4)

A positive electrode plate and a negative electrode plate are offset laminated via a separator to form a laminate, and one end face of a wound body formed by winding the laminate into a cylindrical shape is a positive electrode surface, and the other end surface is a negative electrode surface. An electrode bundle to be
A lead portion disposed corresponding to either the positive electrode surface or the negative electrode surface of the electrode bundle, and connected to either the positive electrode plate or the negative electrode plate,
The lead portion includes a blade portion extending so as to cover a part of the positive electrode surface or the negative electrode surface while securing an insertion portion where the positive electrode surface or the negative electrode surface is exposed. . The battery according to claim 1.
It has multiple lead parts connected to the same pole,
The battery, wherein the blade portion is continuously provided across the plurality of lead portions. The battery according to claim 1 or 2,
An exterior member that accommodates the electrode bundle and the lead portion;
The exterior member includes a deformation restricting portion that protrudes from the inner wall surface facing the surface of the electrode bundle between the lead portion and the electrode bundle and restricts deformation of the lead portion toward the electrode bundle. A battery characterized by being made. The battery according to claim 3.
The battery is characterized in that the deformation restricting portion is formed such that an angle of a surface facing the lead portion with respect to an inner wall surface of the exterior member is an acute angle.

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