JP5817357B2 - Power storage device - Google Patents

Description

  The present invention provides a storage element in which a positive electrode plate and a negative electrode plate are stacked and stored in a housing, and an electrode terminal formed on one side of the housing is electrically connected to the power storage element. The current collector is related to a power storage device in which one end side is fixed to the housing and the other end side supports the power storage element and is disposed along an inner wall surface of the housing.

In such a power storage device, as a wiring form for electrically connecting a power storage element as a power supply source and an electrode terminal installed on the outer side of the device housing, for example, as described in Patent Document 1 below. There is something.
Specifically, a metal current collector is bent along, for example, an L-shape along the inner wall surface of the apparatus casing, and one end side is fixed to the apparatus casing and the other end side is arranged. In many cases, a power storage element is connected to the power storage element to support the power storage element.

JP 2007-073317 A

However, in the structure for supporting the power storage element having the above-described configuration, when a strong vibration or impact is applied to the power storage device, there is a possibility that the current collector, the fixed portion of the current collector, or the like may be damaged.
That is, in order to improve the power supply capacity of the power storage element, the power storage element is configured to be laminated in multiple layers, for example, by winding a pair of a positive electrode plate and a negative electrode plate, and the weight increases accordingly. ing.
When such a power storage element is supported by the current collector configured as described above, if a strong vibration or impact is applied to the device housing, a strong force acts on the current collector itself or on the location where the current collector is fixed in the device housing. As a result, the current collector itself or the fixing location of the current collector in the apparatus housing may be damaged.
The present invention has been made in view of such circumstances, and an object thereof is to improve the vibration resistance performance and impact resistance performance of the power storage device as much as possible.

According to a first aspect of the present application, an electrical storage element that stores a positive electrode plate and a negative electrode plate in a stacked state in a housing, and an electrode terminal formed on one side surface of the housing and the electrical storage element are electrically connected. And a current collector connected to the housing, the one end of the current collector being fixed to the housing, the other end supporting the power storage element, and disposed along the inner wall surface of the housing. In the power storage device, an engagement convex portion that protrudes toward the current collector is formed on an inner wall surface of the casing, and the current collector is engaged with the engagement convex portion. Part is formed , the housing is configured to include a bottomed cylindrical container and a cover part that covers the open surface side of the container, and the engaging convex part is formed on the inner wall surface of the container, The current collector and the power storage element inserted into the container do not interfere with the engaging convex portion, and the engaging convex portion is formed. It is configured to the pass through.

That is, by engaging the engaging convex portion formed on the device housing of the power storage device with the engaged portion of the current collector, displacement of the current collector when vibration or impact is applied is suppressed.
In order to suppress the vibration of the current collector and power storage element arranged in the device housing, the current collector or the like in the gap between the current collector or power storage element and the inner wall of the device housing in the device housing Although it is possible by arranging a member that suppresses vibration of the device, by forming a portion that suppresses vibration of the current collector or the like in the housing of the device itself, while suppressing complication of the device configuration, Vibration of the current collector or the like can be suppressed.

The second invention of the present application, in addition to the configuration of the first invention, the current collector, the both end portions respectively supporting the electric storage element in a direction substantially orthogonal to the depth direction of the container It is provided in a pair so.
In other words, the power storage element is supported by the pair of current collectors, and the power storage elements can be supported more stably by engaging the current collectors to restrict displacement.

The third invention of the present application, in addition to the configuration of the second invention, in the arrangement direction of the pair of the current collector, the inner wall surface tip facing said engaging convex portion, for the engagement and the tip of the convex portion, the distance between passable interval of, at the bottom side of the container from the set position of the engaging convex portion, the insert present existence width in said arrangement direction of the current collector and the power storage element When the width is set, the passable interval is set to be larger than the insert existence width.

That is, in order to form the above-described engaging convex portion on the housing of the power storage device, it is possible to form the current collector and the power storage element in the housing and then apply pressure from the outside. It is not easy to form the engaging projection without damaging the stored power storage element or the like or degrading electrical insulation between the members.
For this reason, it is desirable to make it the manufacturing form which inserts the electrical power collector which connected the electrical storage element to the housing | casing in the state in which the convex part for engagement has already been formed.
Therefore, when the current collector or the like is to be inserted into the housing formed with the engaging convex portion, the size of the housing is set so that the insertion operation can be performed while avoiding the engaging convex portion.
After the current collector or the like is inserted into the container while avoiding the engaging convex portion, the moving operation is performed in the arrangement direction so that the engaged portion of the current collector and the engaging convex portion are engaged. It ’s fine.

  According to a fourth invention of the present application, in addition to the configuration of the third invention, a first engaged portion is disposed on one of the pair of current collectors, and a second engaged portion is disposed on the other. In a state of being arranged, the engaged portion is provided in a pair, and the engaging convex portion includes a first engaging convex portion that engages with the first engaged portion, and the second engaged portion. A pair of second engaging convex portions that engage with the engaging portion are provided, and the first engaging convex portion opens the container in the depth direction more than the second engaging convex portion. It arrange | positions in the state located in the surface side.

That is, it is desirable that the engaging convex portions are provided in pairs so as to engage with the current collectors in correspondence with the current collectors provided in pairs.
In this case, it becomes a problem how to insert the current collector to which the electricity storage element is connected while avoiding interference with the pair of engaging convex portions. Since the pair of engaging projections are provided corresponding to the pair of current collectors, they are arranged on the opposite sides of the inner wall surface of the container, but for both of the engaging projections arranged in this way, It is necessary to perform both the avoidance operation and the engagement operation.
For this coexistence, the first engaging convex portion and the second engaging convex portion constituting the pair of engaging convex portions are arranged in a position shifted in the depth direction of the container, and the first The engaging convex portion is positioned closer to the open surface side of the container in the depth direction of the container than the second engaging convex portion.
Accordingly, the power storage element or the like can be inserted into the container while sequentially avoiding the first engaging convex portion and the second engaging convex portion.

  According to a fifth invention of the present application, in addition to the configuration of the fourth invention, the first engaged portion is formed in a groove shape allowing passage of the first engaging convex portion, In a state where the second engaging convex portion engages with the second engaged portion, the end portion of the container on the open surface side of the first engaged portion in which the first engaging convex portion is groove-shaped The first engaging convex portion and the second engaging convex portion are arranged so as to engage with each other.

That is, when inserting the electricity storage element and the current collector into the container, in order to avoid interference with the engaging convex part, the engaged part that engages with the engaging convex part located on the open surface side of the container is provided. The groove is configured to allow passage of the engaging convex portion (first engaging convex portion) in the depth direction.
Thus, when the current collector or the like is inserted into the container, the current collector or the like is attached to the first engagement member when passing the installation position of the engaging convex part (first engaging convex part) on the open surface side of the container. The first engaging convex portion through which the groove-like engaged portion (first engaged portion) formed on the current collector is inserted by being moved closer to the opposite side of the joint convex portion. Is inserted to the position where the first engaging convex portion passing through the current collector or the like is present, the first engaging convex portion and the first engaged portion of the current collector, Engage.
In this engaged state, the first engaged portion and the first engaging convex portion can be relatively moved in the container depth direction, and further, the second engaging convex portion on the bottom side of the container can be moved. Since a space through which the current collector and the like can pass is secured at the installation position, the current collector and the like can be inserted and moved while avoiding the second engaging convex portion.
In such a state where the second engaging convex portion on the bottom side is avoided, a current collector or the like is further inserted, and after the leading end side of the current collector or the like passes through the second engaging convex portion on the bottom side, The electric body or the like is moved to engage the second engaging convex portion on the bottom side and the engaged portion of the current collector.
When the second engaging convex portion on the bottom side and the second engaged portion are engaged, the first engaging convex portion on the open surface side of the container is a groove-shaped first engaged portion container. When the power storage device vibrates by restricting the position of the current collector or the like in the depth direction at both of the pair of engaging convex portions by setting it to engage with the open surface side end. The influence of can be suppressed.

According to a sixth invention of the present application, in addition to the configuration of any one of the first to fifth inventions, the current collector is formed of a plate-shaped member and is one of the current collectors. The portion is bent to the side where the power storage element is present to form a connection portion for joining to the power storage element, and the base end side portion of the connection portion is the engaged portion.
That is, as a result of forming a connection portion for supporting the power storage element on the current collector, as a result of forming the engaged portion to be engaged with the engaging convex portion of the housing of the device on the current collector, as a result The base end side part of the connection part formed is utilized as said engaged part.

According to a seventh aspect of the present application, there is provided a power storage element that stores a positive electrode plate and a negative electrode plate in a stacked state in a housing, an electrode terminal formed on one side of the housing, and the power storage element. And a current collector that is fixed to the housing at one end side, supports the power storage element at the other end, and is disposed along the inner wall surface of the housing. In the power storage device, an engagement convex portion that protrudes toward the current collector is formed on the inner wall surface of the housing, and the current collector is engaged with the engagement convex portion. An engaging portion is formed, and the casing is configured to include a bottomed cylindrical container and a lid portion that covers an open surface side of the container, and the current collector is substantially in the depth direction of the container. A pair is provided so as to support both ends of the electricity storage element in the orthogonal direction, and the inner wall surface of the container Parts are formed, the engaged portion of the current collector, to permit passage of the engagement convex portion in the depth direction, and, in a groove-shaped end portion of the bottom side of the container is opened The engaging convex portion is formed so as to engage with the end of the groove-shaped engaged portion on the open surface side of the container.
That is, when inserting the assembled current collector and the power storage element into the container, the end of the groove-shaped engaged portion formed on the current collector is open on the container bottom side. Thus, the current collector or the like can be inserted and operated by engaging the engaging convex portion.
When the operation of inserting the current collector into the container is completed, the groove-shaped engaged portion is arranged so that the end portion on the container opening surface side engages with the engaging convex portion. Or even if an impact is applied, the displacement to the container bottom part side, such as a collector, can be controlled.

According to an eighth invention of the present application, in addition to the configuration of any one of the first to seventh inventions, the current collector is provided along an inner wall surface to which the one end side of the housing is fixed. A first posture portion and a second posture portion that is substantially orthogonal to the first posture portion are configured to support the power storage element in the second posture portion.
That is, when the shape of the current collector is bent to the first posture portion and the second posture portion, vibration and impact are applied to the power storage device in a state where no countermeasure is taken. In such a case, the vibration width of the power storage element supported by the current collector becomes large.
When the current collector having such a shape is used, the engaging convex portion of the apparatus housing engages with the engaged portion of the current collector to restrict the position of the current collector. Especially effective.

According to the first aspect of the present invention, the position of the current collector is restricted by the engaging action of the engaging convex portion formed on the device casing and the engaged portion formed on the current collector, thereby complicating the device configuration. The vibration resistance performance and the impact resistance performance of the power storage device can be improved as much as possible while suppressing the increase in size.
In addition, according to the second aspect of the present invention, the displacement of the current collector can be regulated while stably supporting the power storage element with the pair of current collectors. The performance can be further improved.
In addition, according to the third aspect of the present invention, the assembly operation of the power storage device can be performed smoothly even if the engagement convex portion is formed in advance in the housing of the device so that damage to the power storage element or the like can be avoided. it can.

Further, according to the fourth aspect of the invention, the storage element or the like can be inserted into the container while sequentially avoiding the first engaging convex portion and the second engaging convex portion. A pair of engaging convex portions corresponding to the electric body is provided, and the assembly operation of the power storage device can be smoothly performed while the displacement of the current collector can be regulated by both engaging convex portions.
According to the fifth aspect of the present invention, in the operation of inserting the current collector or the like into the container, the interference between the current collector or the like and the first engaging convex portion is accurately caused by the groove-shaped first engaged portion. The insertion operation can be performed while avoiding the problem.
Further, according to the sixth aspect, since the configuration provided for the current collector to support the power storage element is utilized as the engaged portion, it is possible to further suppress the complication of the device configuration.
In addition, according to the seventh aspect of the present invention, the assembly operation of the power storage device can be performed smoothly even if the engagement convex portion is formed in advance on the housing of the device so that damage to the power storage element or the like can be avoided. it can.
According to the eighth aspect of the invention, when the shape of the current collector is bent to the first posture portion and the second posture portion, the current collector is effectively positioned. Can be regulated.

1 is an external perspective view of a secondary battery according to an embodiment of the present invention. 1 is an external perspective view of a secondary battery according to an embodiment of the present invention. The perspective view which shows the inside of the secondary battery concerning embodiment of this invention Sectional drawing of the secondary battery by the front view for demonstrating the assembly process of the secondary battery concerning embodiment of this invention Sectional drawing of the secondary battery by the front view for demonstrating the assembly process of the secondary battery concerning embodiment of this invention Sectional drawing of the secondary battery by the front view for demonstrating the assembly process of the secondary battery concerning embodiment of this invention Sectional drawing of the secondary battery by the front view for demonstrating the assembly process of the secondary battery concerning embodiment of this invention The perspective view which shows the inside of the secondary battery concerning another embodiment of this invention. The perspective view of the secondary battery by front view concerning another embodiment of the present invention.

Hereinafter, embodiments of a power storage device of the present invention will be described with reference to the drawings.
In the present embodiment, a nonaqueous electrolyte secondary battery (more specifically, a lithium ion battery) that is an example of a secondary battery will be described as an example of a power storage device.

[Configuration of Nonaqueous Electrolyte Secondary Battery RB]
As shown in the external perspective views of FIGS. 1 and 2, the non-aqueous electrolyte secondary battery RB of the present embodiment is a can having a bottomed cylindrical shape (more specifically, a bottomed rectangular cylindrical shape). It has a casing BC having a body 1 and a lid portion 2 that covers the open surface side of the can body 1, and the edges of the can body 1 and the lid portion 2 are welded to maintain an airtight state. ing.
The lid portion 2 forming one side surface of the casing BC is formed of a strip-shaped rectangular plate material, and a terminal bolt 5 as a positive electrode terminal and a negative electrode on the outer surface of the casing BC. A terminal bolt 7 is attached as a terminal. The terminal bolts 5 and 7 are both made of a conductive material, and specifically made of metal.
The can body 1 is a flat rectangular parallelepiped shape in accordance with the shape of the lid portion 2, and therefore, the casing BC as a whole has a flat, substantially rectangular parallelepiped shape.
FIG. 1 illustrates the secondary battery RB in a posture in which the positive terminal bolt 5 is positioned on the near side, and FIG. 2 illustrates the secondary battery RB in a posture in which the negative terminal bolt 7 is positioned on the near side. The secondary battery RB is illustrated. The casing BC has an arrangement configuration in which the electrode arrangement is symmetrical between the positive electrode side and the negative electrode side, and there is no difference in the drawings in FIGS. 1 and 2 except for the arrangement of the engaging convex portions 21 and 22 described later. .

On the inner side of the case BC, a power generation element 3 (indicated by a two-dot chain line in FIG. 3) that functions as a power storage element, and supports the power generation element 3 and electrically connects the power generation element 3 and the terminal bolts 5 and 7. Current collectors 4 and 6 for electrical connection are accommodated and disposed in a state of being immersed in the electrolyte. FIG. 3 shows the inner side of the casing BC as a perspective view looking up from the lower side with the can 1 removed.
The current collector 4 and the current collector 6 are both conductors, and have substantially the same shape and are arranged symmetrically, but the materials are different. The positive electrode side current collector 4 is made of aluminum, and the negative electrode side current collector 6 is made of copper.
The current collectors 4 and 6 are configured by bending and forming the above-described metal material plate-like members into a predetermined shape, and extending along the surface of the lid portion 2 which is the arrangement surface of the terminal bolts 5 and 7. A portion (hereinafter referred to as a “first posture portion FP” for convenience of description) and a lower side (of the terminal bolts 5, 7) from the end portion of the first posture portion FP near the longitudinal end portion of the lid portion 2. A portion bent 90 degrees to the side opposite to the existing side and extending in the normal direction of the inner surface of the casing BC of the lid 2 (for convenience of explanation, hereinafter referred to as “second posture portion SP”) Has a substantially L-shaped bent shape.
Thus, the current collectors 4, 6, in which the first posture portion FP and the second posture portion SP are substantially orthogonal and formed in a substantially L shape, It is arranged in a posture along the inner wall surface of the case BC at the part that reaches the wall (the vertical wall constituted by the shortest side of the case BC), and is fixed to the lid 2 on one end side (the first posture part FP side). The power generating element 3 is supported on the other end side (the second posture portion SP side).
Accordingly, the pair of current collectors 4 and 6 support both ends of the power generation element 3 in the direction orthogonal to the depth direction of the can 1.

The current collectors 4 and 6 are further bent at the second posture portion SP to the side where the power generation element 3 is present, and connection portions 4 a and 6 a for joining to the power generation element 3 are formed. Each of the connection portions 4a and 6a is in a posture in which a pair of wall bodies face each other, and an opening 4b that penetrates between the pair of wall bodies in the longitudinal direction of the lid portion 2 (alignment direction of the current collectors 4 and 6). 6b.
The openings 4b and 6b are formed in a substantially rectangular shape when the lid 2 is viewed in the longitudinal direction.

The power generation element 3 applies an active material to each of a pair of electrode plates composed of a foil-like positive electrode plate formed in a long strip shape and a foil-like negative electrode plate formed in a long strip shape, and also has a long strip-like separator. It is comprised as what is called a winding type electric power generation element (electric storage element) made into the lamination | stacking state of the multilayer by interposing. The winding axis at the time of winding is a flat shape, and the outer shape of the power generation element 3 is a flat shape adapted to the shape of the casing BC.
The foil-like positive electrode plate and the foil-like negative electrode plate in the power generation element 3 are formed with uncoated portions 3a and 3b not coated with an active material at one end in the width direction, and wound as described above. In the state, the uncoated portion 3a of the active material of the foil-shaped positive electrode plate and the uncoated portion 3b of the foil-shaped negative electrode plate are located on the opposite sides in the width direction, and the uncoated portions 3a and 3b are respectively provided. However, it extends to the side (width direction) rather than the edge of the separator or the opposite electrode plate on the opposite side.
The power generating element 3 is arranged in the can 1 so that the winding axis of the foil-like positive electrode plate or the like is parallel to the longitudinal direction of the lid 2 and, as schematically shown in FIG. The connecting portion 4a of the current collector 4 enters the center of the uncoated portion 3a of the foil-shaped positive electrode plate, and the uncoated portion 3b of the foil-shaped negative electrode plate having a spiral shape is arranged. The positional relationship is such that the connecting portion 6a of the current collector 6 enters the center.
The uncoated portion 3a of the foil-like positive electrode plate is welded to the connecting portion 4a of the current collector 4 in a bundled state, and the uncoated portion 3b of the foil-like negative electrode plate is connected to the current collector 6 in a bundled state. The power generation element 3 is supported by the second posture portion SP of the current collectors 4 and 6, which is welded to the portion 6 a.
The uncoated portions 3a and 3b are welded to the surfaces of the connection portions 4a and 6a facing the inner wall surface of the casing BC, and do not enter between the pair of wall bodies constituting the connection portions 4a and 6a. .

As described above, the terminal bolt 5 on the positive electrode side attached to the lid 2 made of metal (specifically, aluminum) is electrically connected to the current collector 4 on the positive electrode side, and the terminal bolt on the negative electrode side. 7 is electrically connected to the current collector 6 on the negative electrode side.
Attachment structure of terminal bolt 5 to lid 2 and connection structure of terminal bolt 5 and current collector 4, attachment structure of terminal bolt 7 to lid 2 and connection structure of terminal bolt 7 and current collector 6 Means that substantially the same configuration is arranged symmetrically, and the configuration on the positive electrode side will be mainly described below.

The terminal bolt 5 is integrally formed with a rivet 8 made of the same material on the head side, and is electrically connected to the current collector 4 via the rivet 8 as shown in FIGS. ing. 4 to 7 show a state where the shortest side (side perpendicular to the flat surface of the case BC) is cut in parallel to the flat surface at the center position of the case BC. In order to avoid this, the cross-sectional display of components other than the current collectors 4 and 6 and the can 1 is omitted, and the power generation element 3 is schematically shown by a two-dot chain line.
The rivet 8 passes through the lid portion 2 with the upper gasket 11, the lid portion 2, the lower gasket 12, and the first posture portion FP of the current collector 4 being sandwiched therebetween, and at the end portion on the inner side of the casing BC. It is caulked.
Each of the upper gasket 11 and the lower gasket 12 is formed of a resin that is an electrically insulating material, and electrically insulates the energization path from the terminal bolt 5 to the current collector 4 and the lid 2. The rivet 8 is hermetically sealed at the penetrating portion of the lid 2.

The configuration on the negative electrode side is a configuration in which the configuration on the positive electrode side is arranged symmetrically with respect to the center of the lid 2, and a rivet 15 made of the same material as the terminal bolt 7 is provided on the head side of the terminal bolt 7. As shown in FIGS. 4 to 7, they are integrally formed and are electrically connected to the current collector 4 through the rivets 15.
The rivet 15 penetrates the lid portion 2 with the upper gasket 17, the lid portion 2, the lower gasket 18, and the first posture portion FP of the current collector 6 sandwiched therebetween, and at the end portion on the inner side of the casing BC. It is caulked.
The upper gasket 17 and the lower gasket 18 have the same configuration as the upper gasket 11 and the lower gasket 12 described above, and both are formed of a resin that is an electrically insulating material, and are connected from the terminal bolt 7 to the current collector 6. The energization path and the lid 2 are electrically insulated from each other, and the penetrating portion of the lid 2 in the rivet 15 is hermetically sealed.

The second posture portion SP of the current collectors 4 and 6 is arranged close to the vertical wall on the short side of the can 1 in order to increase the volume of the power generation element 3 as much as possible. The bent portion where the posture portion FP and the second posture portion SP are connected is also located at the longitudinal end of the lid portion 2.
As a result, the moment acting on the fixed position of the rivets 8 and 15 becomes large, and a large force acts on the fixed position of the rivets 8 and 15.
For this reason, the secondary battery RB is provided with a configuration that suppresses the relative displacement of the power generation element 3 with respect to the casing BC.

Specifically, on the inner wall surface of the can 1, engagement convex portions 21 and 22 that project to the side where the current collectors 4 and 6 exist and engage with the current collectors 4 and 6 are formed.
As shown in FIGS. 1 and 2, one engaging convex portion 21 is a current collector on the positive electrode side of the inner wall surface formed by the shortest side (side orthogonal to the flat surface) of the casing BC. 4 is formed on the inner wall surface along the second posture portion SP, and the other engaging convex portion 22 is the negative electrode of the inner wall surface constituted by the shortest side (side orthogonal to the flat surface) of the casing BC. It is formed on the inner wall surface along the second posture portion SP of the current collector 6 on the side.
Each of the pair of engaging convex portions 21 and 22 is formed in a quadrangular prism shape.
The engaging convex portion 21 on the positive electrode side is disposed near the bottom of the can body 1, and the engaging convex portion 22 on the negative electrode side is disposed near the upper open surface of the can body 1, The engaging convex portion 22 is disposed in a state of being displaced in the depth direction of the can body 1.
For convenience of explanation, of the pair of engaging convex portions 21 and 22, the positive-side engaging convex portion 21 located on the bottom side of the can body 1 is referred to as a “second engaging convex portion 21”, and the second engagement thereof. The negative electrode-side engaging convex portion 22 located on the open surface side of the can body 1 with respect to the combined convex portion 21 is referred to as a “first engaging convex portion 22”.

In the current collectors 4, 6, the openings 4 b, 6 b positioned at the base end side portions of the connection parts 4 a, 6 a are connected to a pair of engaged parts with which the pair of engaging convex parts 21, 22 engage. Thus, the displacement of the current collectors 4 and 6 along the inner wall surface of the casing BC is restricted by the tips of the engaging convex portions 21 and 22 entering the openings 4b and 6b and engaging therewith. . It is the positive electrode that engages with the second engaging convex portion 21 at the opening 6 b (first engaged portion) of the negative electrode side current collector 6 that engages with the first engaging convex portion 22. This is the opening 4 b (second engaged portion) of the side current collector 4.
As described above, the disposition height differs between the positive electrode-side engaging convex portion 21 and the negative electrode-side engaging convex portion 22 after the secondary battery RB is assembled. The current collector 4 engages with the lower end of the opening 4b (the bottom side end of the can 1), and the engaging convex portion 22 is the upper end of the opening 6b in the negative current collector 6 (the can It is because it arrange | positions so that it may engage with with respect to the open surface side edge part of the body 1).
The quadrangular prism shape of the pair of engaging convex portions 21 and 22 is a shape that matches the shape of the upper end portion or the lower end portion of the openings 4b and 6b of the current collectors 4 and 6, and the lateral width of the engaging convex portions 21 and 22 Is set to a width smaller than the lateral width of the openings 4b and 6b.
In the present embodiment, the pair of engaging convex portions 21 and 22 are formed by pressing the can body 1, and therefore, recessed holes 23 and 24 are formed on the outer wall surface of the can body 1. The The recessed holes 23 and 24 have a bottomed shape, and the inside and outside of the can body 1 do not communicate with each other in the processing for forming the engaging convex portions 21 and 22.
In addition, although illustration is abbreviate | omitted, the insulating film is formed in the inner wall surface of the can 1, and the pair of engaging convex parts 21 and 22 and the collectors 4 and 6 which mutually engage are electrically insulated. Is secured.

[Manufacturing process of secondary battery RB]
Next, the manufacturing process of the secondary battery RB will be schematically described.
As described above, the power generating element 3 is applied to the long strip-like foil-like positive electrode plate and foil-like negative electrode plate with the positive electrode active material and the negative electrode active material, leaving the uncoated portions 3a and 3b, respectively, and drying treatment, etc. Later, it is wound into a flat shape as described above with a separator in between. The uncoated portions 3a and 3b are wound so that the positive electrode and the negative electrode are positioned at the end edges on the opposite side in the width direction, and the uncoated portions 3a and 3b protrude laterally.

The power generation element 3 produced as described above is assembled on the lid 2 side.
The lid portion 2 is formed with an opening or the like for inserting the rivets 8 and 15 in a plate material that is formed in a stepped shape with a thin edge on the edge portion side, and the upper portion is formed on the surface of the lid portion 2 on the outer side of the casing BC. The gaskets 11 and 17 are attached, and the rivets 8 and 15 formed integrally with the terminal bolts 5 and 7 are inserted into the lid portion 2.
The lower gaskets 12 and 18 and the current collectors 4 and 6 are attached to the surface of the lid portion 2 on the inner side of the casing BC so as to be fitted to the tips of the rivets 8 and 15. Close.
As shown in FIG. 3, the power generation element 3 is assigned to the current collectors 4 and 6 assembled to the lid 2 in this way, and the uncoated portions 3a and 3b of the power generation element 3 and the current collectors 4 and 6 are applied. The connection portions 4a and 6a are welded by ultrasonic welding or the like.

The can body 1 is a flat bottomed rectangular tube-shaped can body 1 produced by deep drawing or the like, and the engaging convex portions 21 and 22 are formed by press working on both narrow side surfaces connected to the open surface of the can body 1. Form. The formation positions of the engaging convex portions 21 and 22 are the positions shown in FIGS. 1 and 2 described above.
As described above, an insulating film is formed on the inner wall surface of the can 1. However, the insulating film may be formed after the above processing, or the above-described material for which the insulating film has been previously formed may be formed. Processing may be performed.

Next, the lid 2 side assembly is assembled to the can 1 described above.
This assembly procedure will be described with reference to FIGS.
As described above, FIG. 4 shows a state in which the casing BC is cut in parallel to the flat surface at the center position of the shortest side (side orthogonal to the flat surface) in order to avoid the complexity of the drawing. The cross-sectional display of the constituent elements other than the current collectors 4 and 6 and the can 1 is omitted, and the power generation element 3 is schematically shown by a two-dot chain line. The same applies to FIGS. 5 to 7.
First, as shown in FIG. 5, the assembly on the lid portion 2 side is inserted into the can body 1 in a state where it is brought closer to the inner wall surface side where the positive engaging second convex portion 21 is formed in the casing BC. go.
An inner wall surface facing the tip of the first engaging convex portion 22 in the arrangement direction of the pair of current collectors 4 and 6 (left and right direction in FIG. 5 and the like) (an inner wall surface on which the positive engaging second engaging convex portion 21 is formed) ) And the tip of the first engaging convex portion 22 (indicated by “D” in FIG. 5) is an interval through which the current collectors 4 and 6 and the power generation element 3 to be inserted can pass. This is called “passable interval”.
On the other hand, the existence width (indicated by “W” in FIG. 5) in the arrangement direction of the current collectors 4, 6 and the power generation element 3 (left and right direction in FIG. 5) is referred to as “insert existence width” for convenience. Called.
The passable interval is set to be larger than the insert existence width, and the lower end of the assembly on the lid 2 side does not interfere with the first engaging convex portion 22 on the negative electrode side. In addition, the first engaging convex portion 22 can be lowered through the formation position.
In the present embodiment, the insert existence width indicated by the symbol “W” is substantially constant over the entire length in the depth direction of the can body 1, and the passable interval indicated by the symbol “D” over the entire length. Although the current collectors 4 and 6 and the power generation element 3 are housed in the case BC, at least from the installation position of the first engaging convex portion 22 in the depth direction of the can body 1. On the bottom side of the can body 1, it is sufficient if it is smaller than the above-described passable interval.

As described above, the opening 6b of the current collector 6 as the first engaged portion is the first engagement on the negative electrode side located on the open surface side of the can body 1 of the pair of engaging convex portions 21 and 22. The engaging convex portion 22 is engaged. The opening 6 b of the current collector 6 is formed in a groove shape that is slightly wider than the width of the engaging convex portion 22 and extends in the depth direction of the can body 1. The passage of the one engaging convex portion 22 is allowed.
The range in which the opening 6b allows the first engaging convex portion 22 to pass is the range indicated by “H1” on the current collector 6 in FIG. 5, and the tip of the first engaging convex portion 22 is within that range. The side enters the opening 6b and can be relatively displaced in the vertical direction.
FIG. 5 shows a state in which the first engagement convex portion 22 on the negative electrode side is lowered to a position that falls within the range of “H1”. From this state, as shown in FIG. The assembly on the side is brought closer to the inner wall surface side where the first engagement convex portion 22 on the negative electrode side is formed in the casing BC.
From this state, the assembly on the lid 2 side is further lowered.
An inner wall surface facing the tip of the second engaging convex portion 21 in the direction in which the pair of current collectors 4 and 6 are arranged (left and right direction in FIG. 6 etc.) (the inner wall surface on which the negative engaging first convex portion 22 is formed) ) And the tip of the second engaging convex portion 21 (indicated by “E” in FIG. 6) is an interval through which the current collectors 4 and 6 to be inserted and the power generation element 3 can pass. Similarly to the interval “D”, for convenience, it is referred to as “passable interval”.
On the other hand, the existence width (indicated by “W” in FIG. 6) of the current collectors 4 and 6 and the power generation element 3 in the arrangement direction (left and right direction in FIG. 6 and the like) is “insert existence width” as described above. It is.
Also here, the passable width is set to be larger than the insert presence width, and the lower end of the assembly on the lid 2 side is the position where the positive engagement convex portion 21 is formed on the positive electrode side. As shown in FIG. 7, the lower surface of the lid portion 2 is lowered to the lowest end position where it contacts the edge of the open surface of the can body 1.

  As for the interval “E”, as in the case of the interval “D”, the width of the insert indicated by the symbol “W” is the state in which the current collectors 4 and 6 and the power generation element 3 are stored in the casing BC. Therefore, it is sufficient that the interval is smaller than the interval indicated by the above-described passable interval from the installation position of the second engaging convex portion 21 in the depth direction of the can body 1 to the bottom side of the can body 1.

As described above, the second engaging convex portion 21 on the positive electrode side engages with the opening 4b (second engaged portion) formed in the current collector 4 on the positive electrode side. The second engaging convex portion 21 can enter the opening 4b at the tip side of the second engaging convex portion 21 within a range indicated by “H2” on the current collector 6 in FIG.
In the state where the assembly on the lid 2 side shown in FIG. 7 is lowered to the lowest end position, the second engaging convex portion 21 on the positive electrode side is lowered to a position that falls within the range of “H2”. From this state, as shown in FIG. 4, the assembly on the lid portion 2 side is moved to the center position of the open surface of the can body 1, and the edge of the lid portion 2 and the edge of the open surface of the can body 1 And a posture that matches with no gap.
By this moving operation, the tip of the second engaging convex portion 21 enters the opening 4b of the current collector 4 and engages.
In a state where the second engaging convex portion 21 positioned on the bottom side of the can body 1 engages with the opening 4b, the first engaging convex portion 22 positioned on the open surface side of the can body 1 has a groove-shaped opening. The installation positions of the pair of engaging convex portions 21 and 22 are set so as to engage with the open surface side end portion of the can 1 in 6b (first engaged portion).
In this state where the assembly on the lid 2 side is assembled to the can 1, the edge of the lid 2 and the edge of the open surface of the can 1 are welded and hermetically sealed.
Thereafter, an electrolytic solution is injected from an injection port (not shown), and further, initial charging (preliminary charging), aging, and the like are performed to complete the secondary battery RB.

In the completed secondary battery RB, the first engaging convex portion 22 formed on the inner wall surface of the can 1 is gently in contact with the upper end portion of the opening 6b of the current collector 6 on the negative electrode side, or When the secondary battery RB is vibrated or shocked, it is located close to the power generating element 3 and the current collectors 4 and 6 (the bottom side of the can body 1). Restrict movement to
The other second engaging convex portion 21 is disposed so as to be gently in contact with the lower end portion of the opening 4b of the current collector 4 on the positive electrode side, or close to the secondary insulating convex portion 4 with a slight gap therebetween. When vibration or impact is applied to the battery RB, the movement of the power generating element 3 and the current collectors 4 and 6 to the upper side (the open surface side of the can 1) is restricted.

[Another embodiment]
Hereinafter, other embodiments of the present invention will be listed.
(1) In the said embodiment, the case where opening 4b, 6b formed in the collectors 4 and 6 is made into the to-be-engaged part which the pair of engaging convex parts 21 and 22 engage is illustrated. However, the shape of the engaged portion can be appropriately changed. For example, as the engaged portion formed on the current collectors 4 and 6, the passage of the engaging convex portion in the depth direction of the can body 1 can be performed. You may form it in the shape of a groove | channel which accept | permits and the edge part by the side of the bottom part of the can 1 is open | released.
More specifically, as shown in FIG. 8 corresponding to FIG. 3 of the above embodiment, the lower ends of the openings 4b and 6b of the current collectors 4 and 6 in the above embodiment are used as they are at the bottom of the can body 1 as they are. It corresponds to a shape penetrating to the side, and the groove-like engaged portion may be configured by the bifurcated connection portions 4a and 6a.
By forming the engaged portion in such a shape, as shown in FIG. 9 corresponding to FIG. 4 of the above-described embodiment, the second engaging convex portion 21 on the positive electrode side in the above-described embodiment, A can in a groove-like engaged portion in which both of the pair of engaging convex portions 21 and 22 are constituted by bifurcated connecting portions 4a and 6a having the same installation height as the first engaging convex portion 22 on the negative electrode side. By engaging with the end portion on the open surface side of the body 1, the movement of the current collectors 4, 6 to the lower side (the bottom side of the can body 1) can be restricted.
In inserting into the can body 1 of the assembly on the lid portion 2 side, in the above embodiment, the position of the assembly on the lid portion 2 side is shifted left and right in order to avoid interference with the engaging convex portions 21 and 22. However, as described above, the groove-like engaged portion has a shape in which the end portion on the bottom side of the can body 1 is opened, so that the assembly on the lid portion 2 side is left and right. It can be inserted without shifting.

(2) In the above-described embodiment, the second engagement convex portion 21 on the positive electrode side is configured to prevent the current collectors 4 and 6 and the power generation element 3 from moving upward. By forming the engaged portion to which the joint convex portion 21 engages with the current collector 4 as a through hole that fits outside the second engaging convex portion 21 instead of the groove-shaped opening 4b extending in the vertical direction. The current collectors 4 and 6 and the power generation element 3 are configured not only to move upward (to the open side of the can 1) but also to move downward (to the bottom of the can 1). You may do it.
(3) In the above embodiment, when an insulating film (not shown) is formed on the inner wall surface of the can 1 in order to ensure electrical insulation between the can 1 and the current collectors 4 and 6. However, it is possible to ensure insulation between the current collectors 4 and 6 and the power generation element 3 by various methods such as covering with a stretchable insulating bag.
(4) In the above-described embodiment, the second engagement convex portion 21 on the positive electrode side is disposed at a position closer to the bottom side of the can body 1, and the first engagement convex portion 22 on the negative electrode side is disposed on the open surface side of the can body 1. Although the case where it arrange | positions close is illustrated, the arrangement | positioning relationship of a pair of engaging convex parts 21 and 22 is contrary to the above, the negative electrode side engaging convex part 22 is made into the position nearer to the bottom part side of the can body 1. It is also possible to arrange the positive electrode side engaging convex portion 21 closer to the open surface side of the can body 1.

(5) In the above embodiment, the secondary battery RB is exemplified as the power storage device, but the present invention can also be applied to a so-called capacitor.
(6) In the above embodiment, the pair of engaging convex portions 21 and 22 are distributed to the pair of vertical wall surfaces of the inner wall surfaces formed by the shortest sides (sides orthogonal to the flat surface) of the casing BC. However, the pair of engaging protrusions 21 and 22 may be arranged side by side on one of the pair of vertical wall surfaces.
(7) In the above embodiment, the case where the pair of engaging convex portions 21 and 22 are formed by pressing the can 1 is illustrated, but the resin that becomes the engaging convex portions 21 and 22 The piece may be formed on the inner wall surface of the casing BC by metal-resin bonding.

DESCRIPTION OF SYMBOLS 1 Container 2 Cover part 3 Electric storage element 4,6 Current collector 4a, 6a Connection part 4b 2nd to-be-engaged part 6b 1st to-be-engaged part 5,7 Electrode terminal 21 2nd convex part for engagement 22 For 1st engagement Convex part BC housing FP 1st attitude part SP 2nd attitude part

Claims (8)

A power storage element that stores a positive electrode plate and a negative electrode plate in a stacked state in a housing, and a current collector that electrically connects the electrode terminal formed on one side surface of the housing and the power storage element. Arranged,
The current collector is a power storage device having one end fixed to the housing and the other end supporting the power storage element and disposed along the inner wall surface of the housing,
On the inner wall surface of the housing, an engaging convex portion protruding to the side where the current collector exists is formed,
An engaged portion that engages with the engaging convex portion is formed on the current collector ,
The housing is configured to include a bottomed cylindrical container and a lid that covers the open surface side of the container,
The engaging convex portion is formed on the inner wall surface of the container,
The power storage device configured to allow the current collector and the power storage element inserted into the container to pass through a position where the engaging convex portion is formed without interfering with the engaging convex portion. 2. The power storage device according to claim 1, wherein the current collector is provided in a pair so as to support both ends of the power storage element in a direction substantially orthogonal to a depth direction of the container. In the arrangement direction of the pair of current collectors, an interval between the inner wall surface facing the tip of the engaging convex portion and the tip of the engaging convex portion is defined as a passable interval,
When the existing width in the arrangement direction of the current collector and the power storage element on the bottom side of the container from the installation position of the engaging convex portion is an insert existing width,
The power storage device according to claim 2, wherein the passable interval is set to be larger than the insert existence width. In a state where the first engaged portion is disposed on one of the pair of current collectors and the second engaged portion is disposed on the other, the engaged portions are provided in a pair,
The engaging convex portion includes a first engaging convex portion that engages with the first engaged portion, and a second engaging convex portion that engages with the second engaged portion. In a pair,
4. The power storage device according to claim 3, wherein the first engaging convex portion is disposed in a state of being located closer to the open surface side of the container in the depth direction than the second engaging convex portion. The first engaged portion is formed in a groove shape allowing passage of the first engaging convex portion,
In a state where the second engaging convex portion engages with the second engaged portion, the end of the container on the open surface side of the first engaged portion in which the first engaging convex portion is groove-shaped The power storage device according to claim 4, wherein the first engaging convex portion and the second engaging convex portion are arranged so as to engage with each other. The current collector is formed of a plate-like member, and a part of the current collector is bent to the existence side of the power storage element to form a connection portion for joining with the power storage element. ,
The power storage device according to claim 1, wherein a base end side portion of the connection portion is the engaged portion. A power storage element that stores a positive electrode plate and a negative electrode plate in a stacked state in a housing, and a current collector that electrically connects the electrode terminal formed on one side surface of the housing and the power storage element. Arranged,
The current collector is a power storage device having one end fixed to the housing and the other end supporting the power storage element and disposed along the inner wall surface of the housing,
On the inner wall surface of the housing, an engaging convex portion protruding to the side where the current collector exists is formed,
An engaged portion that engages with the engaging convex portion is formed on the current collector,
The housing is configured to include a bottomed cylindrical container and a lid that covers the open surface side of the container,
The current collector is provided in a pair so as to support both ends of the electricity storage element in a direction substantially orthogonal to the depth direction of the container,
The engaging convex portion is formed on the inner wall surface of the container,
The engaged portion of the current collector is formed in a groove shape that allows the engaging convex portion to pass in the depth direction and has an open end on the bottom side of the container,
The engaging convex portions, groove-like said that are positioned to engage acting with the end of the open side of the container engaged portion power storage device. The current collector includes a first posture portion along an inner wall surface to which the one end side of the housing is fixed, and a second posture portion that is substantially orthogonal to the first posture portion.
The power storage device according to claim 1, wherein the power storage device is configured to support the power storage element in the second posture portion.

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