JP5831044B2 - battery - Google Patents

Description

  The present invention relates to a battery in which a power generation element in which a foil-like positive electrode plate and a foil-like negative electrode plate are stacked is housed in a battery housing.

As described in Patent Document 1 below, such a battery includes a power generation element in which a foil-like positive electrode plate and a foil-like negative electrode plate are appropriately stacked with a separator or the like sandwiched therebetween, thereby enabling energy density. In many cases, the configuration is increased.
When the power generation element having such a configuration is used, generally, the weight of the power generation element is increased to some extent.
Therefore, when a strong vibration or impact is applied to the battery, the relatively heavy power generation element vibrates violently in the battery case, and stress is applied to the wiring parts for the power generation element, and the power generation element itself, the wiring parts, etc. May be damaged.
For this reason, for example, a spacer or the like formed of an electrically insulating member is packed between the power generation element and the inner wall surface of the battery casing without any gap so that the relative displacement between the power generation element and the battery casing is as much as possible. Suppression is also considered.

JP 2009-105075 A

However, in a configuration in which a spacer or the like is packed between the power generation element and the inner wall surface of the battery casing without any gap, and the relative displacement between the power generation element and the battery casing is suppressed, the relative displacement of the power generation element in the battery casing is Although it can be suppressed sufficiently, the battery assembly work is a process of pushing the power generation element, spacer, etc. strongly into the battery case, resulting in poor workability and damage to the power generation element, etc. There is also a possibility of end.
The present invention has been made in view of such circumstances, and an object of the present invention is to enable the displacement of the power generation element to be accurately suppressed in the battery casing while maintaining good battery assembly workability. is there.

According to a first aspect of the present application, there is provided a battery in which a power generation element in which a foil-like positive electrode plate and a foil-like negative electrode plate are stacked is housed in a battery housing, wherein the power generation element is a long strip-shaped foil. A strip-shaped positive electrode plate and a long strip-shaped foil-shaped negative electrode plate are wound around a winding core with a long strip-shaped separator sandwiched between them , and the groove and the ridge are parallel to each other in the battery casing. A sheet-like member having at least a part of corrugated portions arranged alternately in a posture is arranged, and the sheet-like member has an inner wall surface of the battery casing in which an end in the arrangement direction of the concave grooves and the convex stripes Alternatively, it is configured such that the position is restricted in the arrangement direction in contact with a member continuously provided on the inner wall surface.

That is, the sheet-like member having the corrugated portion is housed in the battery case together with the power generation element, and the position is regulated by contacting the front end in the direction in which the concave grooves and the ridges are in contact with the inner wall surface of the battery case. To. By disposing the sheet-like member thus regulated in the battery casing and filling the space in the battery casing, the relative displacement between the power generation element and the battery casing can be suppressed.
Regarding the arrangement of the sheet-like member in a state in which the position of the sheet-like member is regulated in the battery case, workability when inserting the sheet-like member into the battery case becomes a problem.
In this respect, since the sheet-like member has a shape in which concave grooves and ridges are alternately arranged, the sheet member can be expanded and contracted in the arrangement direction. By utilizing the function of the sheet-like member, the battery casing can be used. The operation of inserting the sheet-like member into the body can be simplified.

  According to a second invention of the present application, in addition to the configuration of the first invention, the corrugated portion is formed along with the expansion of the power generating element after the sheet-like member is accommodated in the battery casing. Are pressed and extended in the arrangement direction, so that the leading ends in the arrangement direction come into contact with the inner wall surface of the battery casing or a member connected to the inner wall surface.

That is, the sheet-like member having the corrugated portion is housed in the battery casing together with the power generation element, and the sheet-like member is expanded after being stored, and the tip in the extending direction is in contact with the inner wall surface of the battery casing. Be regulated.
At the time of storing the sheet-shaped member or the like in the battery casing, the sheet-shaped member and the inner wall of the battery casing have a dimensional margin in the extending direction, so that the sheet-shaped member can be stored easily.
After the sheet-like member or the like is accommodated in the battery casing, the power generation element sucks the electrolytic solution or expands by a charging operation, but the sheet-like member is expanded by utilizing the expansion of the power generation element.
Since the corrugated portion is formed on the sheet-like member, when the power generation element expands and a pressing force acts so as to crush the corrugated portion, the corrugated portion is aligned in the direction in which the grooves and the ridges are arranged. Elongate.
By this extension operation, the front end of the sheet-like member is brought into contact with the inner wall surface of the battery housing.

According to a third invention of the present application, in addition to the configuration of the second invention, the sheet-like member is disposed in a state of being sandwiched between the power generation element and the inner wall surface of the battery casing. Yes.
That is, it is easy to ensure sufficient frictional resistance between the power generation element and the sheet-like member, but the inner wall surface of the battery housing is generally formed in a smooth surface state. It is not easy to increase the frictional resistance with the inner wall surface of the housing so much.
Therefore, if the sheet-like member housed in the battery case is movable in the direction in which the concave grooves and the ridges are aligned, when the power generation element is displaced in the battery case, the sheet-like member is displaced together with the power generation element. The braking force that is not so effective acts on the contact surface between the inner wall surface of the battery housing and the sheet-like member.
On the other hand, when the sheet-like member extends and abuts against the inner wall surface of the battery housing and the position is regulated in the above-described alignment direction, the frictional resistance between the sheet-like member and the power generation element is This acts as a braking force against the displacement of the power generation element, and the displacement of the power generation element can be suppressed.

According to a fourth invention of the present application, in addition to the configuration of the third invention, the internal space of the battery casing is formed to have a flat and substantially rectangular parallelepiped shape, and the power generation element has a flat shape. The sheet-like member is disposed between the flat surface of the power generation element and the inner wall surface of the battery casing facing the flat surface in a posture parallel to the flat surface.
Therefore, the sheet-like member can increase the area of the portion that acts to brake against the displacement of the power generation element, and can more effectively suppress the displacement of the power generation element.

According to a fifth aspect of the present application, in addition to the configuration of the second aspect, the power generating element winds the foil-like positive electrode plate and the foil-like negative electrode plate around the sheet-like member. Is made up of.
As one method of laminating a foil-like positive electrode plate and a foil-like negative electrode plate constituting a power generation element, a so-called winding type power generation element in which a foil-like positive electrode plate and a foil-like negative electrode plate are wound around a winding core is used. Well known.
The sheet-like member having the corrugated portion is used for the winding core of the wound power generation element.
When the expansion of the power generation element is expanded, the space where the core is present is compressed. Therefore, when the sheet-like member is used as the core of the power generation element, the corrugated portion of the sheet-like member is pressed and expanded along with the expansion of the power generation element. .
By this extending operation, the front end of the sheet-like member is brought into contact with the inner wall surface of the battery housing, and the displacement of the power generation element due to vibrations applied from the outside is suppressed.

According to a sixth invention of the present application, in addition to the structure of any one of the first to fifth inventions, the battery casing is made of a conductive material, and the sheet-like member is an electric It is made of an electrically insulating material.
That is, the battery casing is often made of a conductive material such as a metal plate.
In this case, it is necessary to ensure electrical insulation between the power generation element and the battery casing.
Therefore, by configuring the sheet-like member with an electrically insulating material, it is possible to ensure electrical insulation from the battery housing side even when the sheet-like member contacts the battery housing side.
In particular, in the configuration in which the sheet-like member is disposed in a state of being sandwiched between the power generation element and the inner wall surface of the battery casing, the insulating sheet for electrically insulating the power generation element and the inner wall surface of the battery casing. Can also be used.

According to the first aspect of the present invention, the sheet-like member can be expanded and contracted in the direction in which the concave grooves and the ridges are aligned while the position of the sheet-like member is regulated in the battery case. Since the insertion work of the sheet-like member can be simplified, the displacement of the power generation element can be accurately suppressed in the battery housing while maintaining the battery assembly workability satisfactorily.
According to the second aspect of the invention, when the sheet-like member or the like is stored in the battery casing, the sheet-like member and the inner wall of the battery casing have a dimensional margin in the extending direction. The work can be easily performed, and after the sheet-like member or the like is stored in the battery case, the sheet-like member is expanded using the expansion of the power generation element, and the position is regulated on the inner wall of the battery case. While maintaining the assembly workability of the battery satisfactorily, the displacement of the power generation element in the battery casing can be accurately suppressed.

Further, according to the third aspect, even when the sheet-like member is disposed between the power generation element and the inner wall surface of the battery housing, the friction between the sheet-like member and the power generation element is The resistance acts as a braking force against the displacement of the power generation element, and the displacement of the power generation element can be suppressed.
According to the fourth aspect of the invention, the sheet-like member acts as a brake on the power generation element with a large area, and the displacement of the power generation element can be more effectively suppressed.
Further, according to the fifth aspect, the sheet-like member is also used as the core of the power generation element, so that the sheet-like member is arranged using the arrangement space of the core, and the space in the battery casing is reduced. Effective use.
According to the sixth aspect, the sheet-like member is made of an electrically insulating material, so that electrical insulation between the power generation element and the battery housing can be ensured.

1 is an external perspective view of a battery according to an embodiment of the present invention. The perspective view which shows the internal structure of the battery concerning embodiment of this invention. The front view which shows the internal structure of the battery concerning embodiment of this invention. Sectional drawing by planar view for demonstrating the attitude | position change of the sheet-like member concerning embodiment of this invention The perspective view of the sheet-like member concerning embodiment of this invention The perspective view of the core comprised with the sheet-like member concerning embodiment of this invention Sectional drawing by planar view for demonstrating the attitude | position change of the sheet-like member concerning another embodiment of this invention

Hereinafter, embodiments of the battery of the present invention will be described with reference to the drawings.
In the present embodiment, a non-aqueous electrolyte secondary battery (more specifically, a lithium ion battery) which is an example of a secondary battery will be described as an example.

[Configuration of Nonaqueous Electrolyte Secondary Battery RB]
As shown in the perspective views of FIGS. 1 and 2 and the front view of FIG. 3, the nonaqueous electrolyte secondary battery RB of the present embodiment has a bottomed cylindrical shape (more specifically, a bottomed rectangular cylindrical shape). The battery case BC (hereinafter, may be referred to as a unit “casing BC”) is formed by covering the open surface of the can body 1 with a substantially flat lid portion 2 and welding. The can 1 and the lid 2 are made of a conductive metal material, and are specifically made of aluminum.
The lid 2 is formed in a strip-like rectangle, and the casing BC has a flat, substantially rectangular parallelepiped outer shape as a whole, and a flat, substantially rectangular parallelepiped internal space. FIG. 2 illustrates the internal configuration of the casing BC by removing the can body 1 and the like from the completed secondary battery RB (shown in FIG. 1). Further, FIG. 3 shows the can body 1 by a two-dot chain line, omitting the illustration of members as appropriate, and showing the inside of the housing BC through.

The power generation element 3 and current collectors 4 and 6 indicated by a two-dot chain line in FIGS. 2 and 3 are housed and disposed inside the housing BC in a state of being immersed in the electrolytic solution. As will be described later in detail, the power generation element 3 is formed by applying an active material to both the front and back surfaces of a pair of electrode plates composed of a long strip-like foil-like positive electrode plate and a long strip-like foil-like negative electrode plate. 6 is wound around the core 3c shown in FIG. 6, and a foil-like positive electrode plate and a foil-like negative electrode plate are laminated.
The winding core 3c winds a foil-like positive electrode plate or the like around a winding axis indicated by a two-dot chain line A in FIG. Accordingly, the direction indicated by the arrow B in FIG. 6 is the width direction of the long strip-like foil-like positive electrode plate or the like.
Since the winding core 3c has a flat shape as shown in FIG. 6, the outer shape of the power generation element 3 formed by winding a foil-like positive electrode plate or the like around the winding core 3c of this shape is also shown in FIG. Moreover, it becomes a flat shape adapted to the shape of the internal space of the casing BC.
In the foil-like positive electrode plate and the foil-like negative electrode plate, uncoated portions 3a and 3b where no active material is applied are set on one end in the width direction, and when the foil-like positive electrode plate or the like is wound around the core 3c. The foil-shaped positive electrode plate uncoated portion 3a and the foil-shaped negative electrode plate uncoated portion 3b are located on the opposite side, and the uncoated portions 3a and 3b protrude in the width direction. Place and wrap around.
The uncoated portions 3a and 3b are for electrical wiring to the power generation element 3. The uncoated portion 3a on the positive electrode side is joined to the positive electrode current collector 4 by ultrasonic welding or the like, and the negative electrode side The uncoated portion 3b is joined to the negative electrode side current collector 6 by ultrasonic welding or the like.

The current collectors 4 and 6 are produced by cutting a metal plate into a predetermined shape and then bending, and the overall schematic shape includes a portion along the lid 2 and a portion along the vertical wall of the can 1. It is substantially L-shaped. The material of the current collector 4 on the positive electrode side is aluminum, and the material of the current collector 6 on the negative electrode side is copper.
In the portion along the vertical wall of the can body 1, connecting portions 4 a and 6 a are formed standing on the side where the power generation element 3 is present, and further, slit-shaped notches 4 b and 4 a are formed at the base end positions of the connecting portions 4 a and 6 a. 6b is formed.

The lid 2 made of metal (specifically, made of aluminum) has a current collector 4 on the positive electrode side, a terminal bolt 5 which is a positive electrode terminal connected to the current collector 4, and a negative electrode side current collector 4. A current collector 6 and a negative terminal bolt 7 connected to the current collector 6 are attached.
The terminal bolt 5 is attached and fixed to the lid portion 2 by sandwiching a pair of gaskets 9 and 10 arranged with the lid portion 2 sandwiched between the head of the terminal bolt 5 and the current collector 4, and The rivet 5a formed in the part is fixed by caulking in a state where the current collector 4 is penetrated.
The negative electrode side has the same structure, and a pair of gaskets 11 and 12 arranged with the lid 2 sandwiched between them are sandwiched between the head of the terminal bolt 7 and the current collector 6 and formed on the head of the terminal bolt 7. The terminal bolt 7 is fixed to the lid portion by caulking the rivet 7a being passed through the current collector 6 (see FIG. 3).
The electrode structure on the negative electrode side including the terminal bolts 5 and 7 and the current collectors 4 and 6 and the electrode structure on the positive electrode side are in a symmetrical arrangement, and only the material of the metal member is different.
The metal member on the positive electrode side is made of aluminum, and the metal member on the negative electrode side is made of copper.

[Manufacturing process of secondary battery RB]
Next, the manufacturing process of the secondary battery RB will be schematically described.
First, assembly of the power generation element 3 will be described.
A long strip-shaped aluminum foil is used as a foil-shaped positive electrode plate, and a long strip-shaped copper foil is used as a foil-shaped negative electrode plate. A positive electrode active material and a negative electrode active material are applied to both the front and back surfaces, respectively. A side electrode is produced. The long belt-like positive electrode side electrode and the long belt-like negative electrode side electrode are wound around the core 3c shown in FIG.
In winding the foil-like positive electrode plate or the like, the foil-like positive electrode plate and the foil-like negative electrode plate are displaced in the width direction, and as described above, the uncoated portion 3a of the foil-like positive electrode plate and the foil-like negative electrode It winds in the state which the uncoated part 3b of a board protrudes in the reverse side in the width direction. In addition, the separator is disposed so as to reliably cover the coating region of the positive electrode active material and the coating region of the negative electrode active material which face each other.

The winding core 3c is composed of a sheet-like member SE having the shape shown in FIG. 5A, and two sheet-like members SE having the same shape are arranged back to back.
The sheet-like member SE has a trapezoidal ridge 31 in the direction indicated by the arrow C in FIG. 5A as shown in FIG. 5B in which the perspective view of FIG. And the trapezoidal concave grooves 32 are arranged so as to be alternately arranged in parallel with each other and have a corrugated portion WP and flat portions FP disposed at both ends of the corrugated portion WP. Note that the sheet-like member SE is formed as a sheet, and whether the protrusions 31 and the grooves 32 are convex or concave varies depending on the direction of viewing the sheet-like member SE, but here, the position of the flat portion FP As a reference, the side protruding from the flat part FP is a ridge 31, and the valley portion sandwiched between the ridges 31 is a groove 32.
The function of the waveform portion WP having such a shape will be described later.
The material of the sheet-like member SE that constitutes the core 3c is made of a material that has a predetermined rigidity, is an electrically insulating material, and can withstand an electrolytic solution. Specifically, PPS (polyphenylene sulfate) is used. A resin such as Fido), PP (polypropylene), PE (polyethylene), and PVDF (polyvinylidene fluoride) may be used, but PPS is preferable from the viewpoint of heat resistance.

Next, the assembly of the lid part 2 will be described.
The lid 2 has a current collector 4, 6 and terminal bolts 5, 7 sandwiched between gaskets 9, 10, 11, and 12 on an aluminum plate material in which electrode mounting holes for attaching terminal bolts 5 and 7 are formed. In this state, the rivets 5a and 7a through which the current collectors 4 and 6 are inserted are caulked and fixed.
Next, the uncoated portions 3a and 3b of the power generating element 3 are welded and connected to the connecting portions 4a and 6a of the current collectors 4 and 6 fixed to the lid portion 2 as described above, thereby the lid portion 2 and the power generation element 3 are integrated.
The pair of connecting portions 4a and 6a of the current collectors 4 and 6 respectively enter the uncoated portions 3a and 3b, and the uncoated portions 3a and 3b bundled together connect the connecting portions 4a and 6a on both sides. It is arranged so as to be sandwiched between and welded. Since each connection part 4a, 6a is divided into two forks, and the uncoated parts 3a, 3b are joined to the respective parts, even when the connection parts 4a, 6a and the uncoated parts 3a, 3b are joined, The core 3c can be seen from the sides of the electric bodies 4 and 6.
Next, the assembly on the lid 2 side assembled as described above is stored in the can 1.

When the assembly on the lid 2 side is stored in the can 1, the sheet-like member SE having a shape substantially the same as that shown in FIG. 5A is used with the flat surface of the power generation element 3 sandwiched from both sides. It arrange | positions to a pair and accommodates a pair of sheet-like member SE and the assembly by the side of the cover part 2 together. The direction of the sheet-like member SE is such that the direction in which the ridges 31 and the grooves 32 of the corrugated portion WP are aligned is the direction of the winding axis of the power generating element 3 or the connecting portion 4a of the current collector 4 on the positive electrode side. The direction coincides with the direction in which the electric body 6 is aligned with the connection portion 6a, and also coincides with the sheet-like member SE constituting the core 3c.
The pair of sheet-like members SE that sandwich the flat surface of the power generation element 3 is different only in that the length in the direction indicated by the arrow D in FIG. 5A is slightly longer than that shown in FIG. Thus, the shapes of the protrusions 31 and the grooves 32 are completely the same, and the materials are also the same. The sheet-like member SE of FIG. 5A used as the winding core 3c is housed in the center of the power generation element 3 and has a size smaller than the vertical width of the power generation element 3. The pair of sheet-like members SE sandwiching the flat surface from both sides is the vertical width of the power generation element 3 as viewed in the normal direction of the flat surface of the power generation element 3 in a state where the pair of sheet-like members SE is housed in the can 1. The length is set to cover the whole.

When the assembly on the lid 2 side is stored in the can body 1 with the flat surface of the power generation element 3 sandwiched between the pair of sheet-like members SE, the approximate positional relationship is as shown in FIG. Become. FIG. 4 (a) shows a cross-sectional view in plan view at the center position in the height direction of the can body 1. In order to avoid the complexity of the drawing, the illustration of the uncoated portions 3a, 3b, etc. is omitted. ing. FIG. 4B, which will be described later, is also illustrated in the same form.
In the state shown in FIG. 4A, the sheet-like member SE is sandwiched between the flat surface of the power generation element 3 and the inner wall surface of the can 1 facing the flat surface of the power generation element 3. 3, the length of the sheet-like member SE (the length in the winding axis direction of the power generation element 3) is the length of the inner wall surface on the long side of the can 1 Since there is a slight gap between the flat surface of the power generation element 3 and the power generation element 3 sandwiched between the pair of sheet-like members SE, Easy to do.

Thus, the assembly of the casing BC of the secondary battery RB is completed by welding the lid portion 2 and the can body 1 with the power generation element 3 and the like stored in the can body 1.
When the assembly of the case BC is completed, an electrolyte is then injected into the case BC from an injection port (not shown). When the injection of the electrolyte is completed, the initial charge of the secondary battery RB is performed under predetermined charging conditions. The secondary battery RB is completed by performing (preliminary charging) and further performing aging and the like.
In the process of injecting and charging the electrolytic solution, the power generation element 3 expands and changes to the state shown in FIG.
The power generation element 3 expands as shown by an arrow E in FIG. 4B, the interval between the flat surface of the power generation element 3 and the inner wall surface of the can body 1 is narrowed, and the width of the space where the winding core 3c exists is also reduced. It narrows.
As a result of the deformation of the power generation element 3, the sheet-like member SE and the core 3c disposed between the flat surface of the power generation element 3 and the inner wall surface of the can 1 are pressed in the thickness direction thereof. The
Accordingly, the corrugated portion WP of the sheet-like member SE including the sheet-like member SE constituting the core 3c is pressed, and the trapezoidal ridges 31 and the trapezoidal concave grooves 32 of the corrugated portion WP are crushed. As a result, the sheet-like member SE extends in the direction in which the ridges 31 and the grooves 32 are aligned (the direction indicated by the arrow C in FIG. 5A). At this time, the sheet-like member SE constituting the core 3c extends through the positions where the current collectors 4 and 6 have the cuts 4b and 6b.

By the extension of the sheet-like member SE, the flat portion FP located at the tip in the extension direction (the direction in which the ridges 31 and the grooves 32 are arranged) contacts the inner wall surface of the side surface orthogonal to the flat surface of the can body 1. To do.
The leading end of the sheet-like member SE in the extending direction comes into contact with the inner wall surface of the can 1 so that the position of the sheet-like member SE is regulated in the extending direction, and external force such as strong impact or vibration is applied to the casing BC from the outside. Even when it acts, the displacement along the alignment direction of the ridges 31 and the grooves 32 of the sheet-like member SE is sufficiently suppressed, and at the contact portion between the sheet-like member SE and the flat surface of the power generation element 3 due to frictional resistance. The displacement of the power generation element 3 is suppressed by a strong braking force.

[Another embodiment]
Hereinafter, other embodiments of the present invention will be listed.
(1) In the above-described embodiment, the case where the sheet-like member SE is used for electrical insulation between the power generation element 3 and the inner wall surface of the can 1 is illustrated. As shown, it may be configured to be used for electrical insulation between the current collectors 4 and 6 and the inner wall surface of the can 1.
FIG. 7 corresponds to FIG. 4 in the above embodiment, and shows a cross-sectional view of the can 1 in a plan view. As in FIG. 4, in order to avoid the complexity of the drawing, uncoated Although illustration of the parts 3a and 3b is omitted, unlike FIG. 4, the positions of the current collectors 4 and 6 in plan view are indicated by two-dot chain lines.
FIG. 7A shows a state where the power generation element 3 has not yet expanded before the electrolyte is injected into the casing BC. FIG. 7B shows the state of the electrolyte in the casing BC. The state where the power generation element 3 is expanded by injection or charging is shown.

The sheet-like member SE shown in FIG. 7 includes an upright portion 33 that is bent and formed in an attitude perpendicular to the formation surface of the corrugated portion WP from one end in the alignment direction of the ridges 31 and the grooves 32. The standing portion 33 is disposed between the current collectors 4 and 6 and the inner wall surface of the vertical wall on the short side of the can 1 (the inner wall surface of the vertical wall orthogonal to the flat surface).
As shown in FIG. 7B, when the power generating element 3 expands in the direction indicated by the arrow E, the corrugated portion WP pressed by the power generating element 3 expands in the direction in which the ridges 31 and the grooves 32 are aligned, and extends. The tip in the direction comes into contact with the inner wall surface of the can 1, and the sheet-like member SE surrounds the power generation element 3 and the current collectors 4 and 6.
As the shape of the sheet-like member SE, it may be formed in a flat cylindrical shape in which the corrugated portion WP is formed on a pair of flat surfaces.

(2) In the above embodiment, as the shape of the corrugated portion WP of the sheet-like member SE, the trapezoidal convex ridges 31 and the trapezoidal concave grooves 32 are alternately arranged to have a corrugated shape. The specific shape can be variously changed. For example, the ridges and the grooves may be alternately arranged so as to form a sine wave shape or a triangular wave shape.
(3) In the above-described embodiment, the core 3c of the power generation element 3 is configured by two sheet-like members SE. However, the core 3c may be configured by only one sheet, or may be formed by three or more sheets. The core 3c may be configured by the member SE.
(4) In the above-described embodiment, the case where the tip of the sheet-like member SE that has expanded as the power generating element 3 expands directly contacts the inner wall surface of the casing BC is illustrated. It is not necessary to directly contact the inner wall surface of the body BC. A member is appropriately connected to the inner wall surface of the casing BC, and the distal end in the extending direction of the sheet-like member SE is contacted to the connected member. And you may comprise so that position control may be carried out in the row direction (extension direction of sheet-like member SE) of the protruding item | line 31 and the ditch | groove 32. FIG.

(5) In the above embodiment, as the arrangement form of the sheet-like member SE in the casing BC, the arrangement direction of the ridges 31 and the grooves 32 of the corrugated part WP is changed to the connection part 4a of the current collector 4 on the positive electrode side. And the connection direction 6a of the current collector 6 on the negative electrode side is illustrated as an example, but for the pair of sheet-like members SE arranged with the flat surface of the power generating element 3 sandwiched therebetween, The arrangement direction of the ridges 31 and the grooves 32 of the WP may coincide with the depth direction of the can 1 perpendicular to the arrangement direction of the connection portions 4a and 6a of the pair of current collectors 4 and 6. In this case, the front end of the sheet-like member SE that has expanded along with the expansion of the power generation element 3 comes into contact with the lid portion 2 and the bottom surface of the can body 1 and is regulated in position.
Furthermore, one of the pair of sheet-like members SE arranged with the flat surface of the power generation element 3 sandwiched the direction of the alignment of the ridges 31 and the grooves 32 of the corrugated part WP is the same as that of the pair of current collectors 4 and 6. You may make it correspond with the alignment direction of the connection parts 4a and 6a, and may make the other correspond with the depth direction of the can 1 orthogonal to the alignment direction of the connection parts 4a and 6a of a pair of collectors 4 and 6.

3 Power Generation Element 31 Convex Strip 32 Concave Groove BC Battery Case SE Sheet-like Member WP Corrugated Part

Claims (6)

A battery configured to house a power generation element in which a foil-like positive electrode plate and a foil-like negative electrode plate are stacked in a battery housing,
The power generating element is configured by winding a long strip-shaped foil-shaped positive electrode plate and a long strip-shaped foil-shaped negative electrode plate around a core in a state of sandwiching a long strip-shaped separator,
In the battery housing, a sheet-like member having at least a part of a corrugated portion in which concave grooves and convex stripes are alternately arranged in a parallel posture is arranged,
The sheet-like member has an end in the arrangement direction of the concave grooves and the protrusions in contact with the inner wall surface of the battery casing or a member connected to the inner wall surface in the arrangement direction. A battery that is configured to be position regulated.   After the sheet-like member is accommodated in the battery casing, the corrugated portion is pressed and expanded in the alignment direction as the power generation element expands, so that the tip in the alignment direction becomes the battery. The battery according to claim 1, wherein the battery is configured to contact an inner wall surface of the housing or a member connected to the inner wall surface.   The battery according to claim 2, wherein the sheet-like member is disposed in a state of being sandwiched between the power generation element and an inner wall surface of the battery casing. The internal space of the battery casing is formed to have a flat, substantially rectangular parallelepiped shape,
The power generation element is formed in a flat shape,
4. The battery according to claim 3, wherein the sheet-like member is disposed in a posture parallel to the flat surface between a flat surface of the power generation element and an inner wall surface of the battery casing facing the flat surface.   The battery according to claim 2, wherein the power generation element is configured by winding the foil-like positive electrode plate and the foil-like negative electrode plate around the sheet-like member. The battery casing is made of a conductive material,
The battery according to claim 1, wherein the sheet-like member is made of an electrically insulating material.

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