JP2012155947A - Sealed battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealed battery in which the bonding reliability is high at a positive electrode collection welded part and a negative electrode collection welded part.SOLUTION: A positive electrode collection terminal member 134 has one end (a caulked portion 134c) fixed to a lid 130, and the other end (a collection bonded part 134b) welded to a counter surface 155c (the upper surface of a positive electrode mixture layer uncoated part 155b located below the lid 130) facing the lid 130, out of the positive electrode mixture layer uncoated part 155b, in the vertical direction. A negative electrode collection terminal member 135 has one end (a caulked portion 135c) fixed to the lid 130, and the other end (a collection bonded part 135b) welded to a counter surface 156c (the upper surface of a negative electrode mixture layer uncoated part 156b located below the lid 130) facing the lid 130, out of the negative electrode mixture layer uncoated part 156b, in the vertical direction.

Description

  The present invention relates to a sealed battery.

  The sealed battery of Patent Document 1 includes an electrode body in which a positive electrode plate, a negative electrode plate, and a separator are wound in a flat shape, a positive electrode current collector terminal member (positive electrode current collector plate) welded to the positive electrode plate, and a negative electrode plate. A negative electrode current collector terminal member (negative electrode current collector plate) welded, a case main body (external can) having a rectangular box shape having an opening on the upper end side, and an electrode body, and an upper end side of the case main body A lid (sealing body) that closes the opening of the case body. The positive electrode plate has a coating portion of a positive electrode mixture layer containing a positive electrode active material and a positive electrode mixture layer uncoated portion. The negative electrode plate has a coating portion of a negative electrode mixture layer containing a negative electrode active material and a negative electrode mixture layer uncoated portion.

JP 2010-86780 A

  The electrode body is accommodated in the case body so that the axial direction of the electrode body coincides with the left-right direction, and the longitudinal direction of the cross section obtained by cutting the electrode body in the direction orthogonal to the axial direction coincides with the vertical direction. . Further, in the left-right direction, the electrode body has a positive electrode mixture layer uncoated portion (positive electrode core exposed portion) disposed on one end side of the electrode body, and a negative electrode mixture layer uncoated portion ( A negative electrode core exposed portion).

  The battery of Patent Document 1 is manufactured, for example, as follows. After producing an electrode body in which the positive electrode plate, the negative electrode plate, and the separator are wound in a flat shape, the positive electrode current collector terminal member is welded to the positive electrode mixture layer uncoated portion of the electrode body, and further the negative electrode current collector terminal member Is welded to the uncoated portion of the negative electrode mixture layer of the electrode body. In the battery of Patent Document 1, the positive electrode current collecting terminal member is welded to the side surface (surface extending in the vertical direction) of the positive electrode mixture layer uncoated portion. Similarly, the negative electrode current collecting terminal member is welded to the side surface (surface extending in the vertical direction) of the negative electrode composite material layer uncoated portion. Thereafter, the positive electrode current collector terminal member and the negative electrode current collector terminal member were fixed to the lid body by caulking and joined, and the electrode body subassembly (the positive electrode current collector terminal member and the negative electrode current collector terminal member fixed to the lid body were welded) Electrode body). Next, the electrode body portion of the electrode body subassembly is inserted (accommodated) into the case body through the opening of the case body so that the lid body of the electrode body subassembly is pressed downward.

  However, when the electrode body subassembly is inserted (accommodated) in the case body, a welded portion (also referred to as a positive current collector welded portion) between the positive current collector terminal member and the positive electrode mixture layer uncoated portion, and a negative current collector A shear stress may occur in a welded portion (also referred to as a negative electrode current collector welded portion) between the terminal member and the negative electrode composite material layer uncoated portion. Specifically, the electrode body subassembly is in contact with the inner surface of the case body while the electrode body subassembly is inserted (accommodated) in such a manner that the lid body of the electrode body subassembly is pressed downward. To receive the force upward. For this reason, in the positive electrode current collector welded portion, shearing stress is generated in the positive electrode current collector welded portion so that the positive electrode current collector terminal member side receives a force downward and the positive electrode mixture layer uncoated portion side receives an upward force. . Similarly, shear stress is also generated in the positive electrode current collector weld. For this reason, a crack etc. generate | occur | produced in the positive electrode current collection welding part and the negative electrode current collection welding part, and there existed a possibility that joining reliability might fall.

  This invention is made | formed in view of this present condition, Comprising: It aims at providing the sealing type battery with high joining reliability in a positive electrode current collection welding part and a negative electrode current collection welding part.

  One aspect of the present invention includes a positive electrode plate, a negative electrode plate, and an electrode body obtained by winding a separator in a flat shape, a positive electrode current collecting terminal member welded to the positive electrode plate, and a negative electrode current collector welded to the negative electrode plate A terminal member, a rectangular box shape having an opening on the upper end side, and a case main body that accommodates the electrode body, and a lid body that is positioned on the upper end side of the case main body and closes the opening of the case main body. The electrode body has an axial direction that coincides with the left-right direction, and a longitudinal direction of a cross section of the electrode body cut in a direction perpendicular to the axial direction coincides with the vertical direction. The positive electrode plate has a positive electrode mixture layer coated portion containing a positive electrode active material and a positive electrode mixture layer uncoated portion, and the negative electrode plate is Application part of negative electrode mixture layer containing negative electrode active material, and negative electrode mixture layer uncoated part The positive electrode mixture layer uncoated portion is disposed on one end side of the electrode body, and the negative electrode mixture layer uncoated portion is disposed on the other end side in the left-right direction. The positive electrode current collecting terminal member has one end fixed to the lid, and the other end facing the lid in the vertical direction in the positive electrode mixture layer uncoated portion. The negative electrode current collector terminal member is welded to the opposite surface, and one end portion of the negative electrode current collecting terminal member is fixed to the lid body, and the other end portion is connected to the lid body in the negative electrode mixture layer uncoated portion. It is a sealed battery that is welded to opposing surfaces that face in the vertical direction.

  In the above-described sealed battery, one end of the positive electrode current collector terminal member is fixed to the lid, and the other end of the positive electrode current collector terminal member is the lid of the positive electrode mixture layer uncoated portion. It welds to the opposing surface (upper surface of the positive electrode compound-material layer uncoated part located under a cover body) which opposes an up-down direction. Furthermore, one end of the negative electrode current collector terminal member is fixed to the lid, and the other end of the negative electrode current collector terminal member faces the vertical direction of the lid of the negative electrode mixture layer uncoated portion. (It is welded to the upper surface of the uncoated portion of the negative electrode mixture layer located below the lid). That is, the positive electrode current collector terminal member and the positive electrode mixture layer uncoated portion are welded in the vertical direction (the direction along the insertion direction of the electrode body subassembly), and the negative electrode current collector terminal member and the negative electrode mixture layer uncoated portion The coating part is welded in the vertical direction (direction along the insertion direction of the electrode body subassembly).

For this reason, in the above-described sealed battery, the electrode body subassembly comes into contact with the inner side surface of the case body while the electrode body subassembly is inserted (accommodated) into the case body through the opening of the case body in the manufacturing process. When a force is applied upward, a welded portion (also referred to as a positive electrode current collector welded portion) between the positive electrode current collector terminal member and the positive electrode mixture layer uncoated portion, and a negative electrode current collector terminal member and the negative electrode mixture layer uncoated The stress applied to the welded part (also referred to as the negative electrode current collector welded part) with the work part does not act in the shear direction of these welded parts (acts in the compression direction). Thus, when inserting (accommodating) the electrode body subassembly into the case main body, no shear stress is generated in the positive electrode current collector welded portion and the negative electrode current collector welded portion. It is possible to suppress problems that cause cracks and the like.
Therefore, the above-mentioned sealed battery is a battery with high bonding reliability for the positive electrode current collector weld and the negative electrode current collector weld.

  In addition, a positive electrode mixture layer uncoated part means the site | part which consists only of metal foil (metal plate) which comprises a positive electrode plate, without having the positive electrode mixture layer containing a positive electrode active material. Similarly, the negative electrode mixture layer uncoated portion refers to a portion made only of a metal foil (metal plate) constituting the negative electrode plate without having a negative electrode mixture layer containing a negative electrode active material.

  Further, in the above sealed battery, the other end portion of the positive electrode current collector terminal member presses the opposing surface of the positive electrode mixture layer uncoated portion downward, and the negative electrode current collector terminal member By pressing the opposite surface of the negative electrode composite material layer uncoated part downward with the other end of the electrode body, the electrode body is directly or between the bottom surface of the electrode body and the bottom of the case body. It is preferable that the battery is a sealed battery that is fixed by being sandwiched between the positive current collector terminal member and the negative current collector terminal member and the bottom of the case body with an electrically insulating member interposed therebetween.

  When a conventional sealed battery (for example, the battery disclosed in Patent Document 1) is used in an environment subject to vibration (for example, mounted on a vehicle as a vehicle power source of a hybrid vehicle or the like), the electrode body is disposed in the battery case. There was a risk of vibration (particularly vibration in the vertical direction). Due to this vibration, stress (particularly shear stress) is applied to the positive electrode current collector weld and the negative electrode current collector weld, and cracks and the like are generated in the positive electrode current collector weld and negative electrode current collector weld, thereby lowering the joint reliability. There was a fear.

  On the other hand, in the above-mentioned sealed battery, the electrode body is sandwiched between the positive current collecting terminal member and the negative current collecting terminal member and the bottom portion of the case main body, and is configured by a battery case (case main body and lid). ) Is fixed inside. For this reason, even when the battery is used in an environment subject to vibration (for example, mounted on a vehicle as a vehicle power source of a hybrid vehicle or the like), the electrode body can be prevented from vibrating in the battery case. it can. Therefore, even when the battery is used in an environment subject to vibration, “problems in which cracks and the like are generated in the positive electrode current collector weld and the negative electrode current collector weld due to the influence of vibration” can be suppressed.

In particular, in the above-described sealed battery, since the opposite surface (upper surface) of the positive electrode mixture layer uncoated portion is pressed downward by the other end portion of the positive electrode current collector terminal member, A force is acting in a direction in which the positive electrode current collecting terminal member and the positive electrode mixture layer uncoated part approach each other (a direction facing up and down). Similarly, since the opposite surface (upper surface) of the negative electrode mixture layer uncoated portion is pressed downward by the other end portion of the negative electrode current collector terminal member, in the negative electrode current collector welded portion, A force is acting in a direction in which the negative electrode composite material layer uncoated part approaches each other (a direction facing up and down). For this reason, even if the vertical vibration is applied to the battery, the positive electrode current collector welded portion and the negative electrode current collector welded portion are not easily broken (not easily peeled off).
From the above, the above-described sealed battery is a battery having higher bonding reliability with respect to the positive electrode current collector weld and the negative electrode current collector weld.

  Furthermore, in the above sealed battery, the sealed battery may be a sealed battery that is a battery for a vehicle driving power source.

  The above-described sealed battery is a battery having high vibration resistance, “cracks and the like are suppressed from occurring in the positive electrode current collector weld and the negative electrode current collector weld due to the influence of vibration”. For this reason, even if the battery, which is a battery for a vehicle driving power supply, is mounted on a vehicle and used as a vehicle power source for a hybrid vehicle or the like, the positive current collector welded portion and the negative current collector welded portion are affected by vehicle vibration. The problem of cracks and the like occurring in Therefore, the above-described sealed battery is suitable as a battery for a vehicle driving power source.

It is a top view of the sealed battery concerning an embodiment. It is sectional drawing of the battery, and is equivalent to AA sectional drawing of FIG. It is sectional drawing of the battery, and is equivalent to BB sectional drawing of FIG. It is sectional drawing of the battery, and is equivalent to CC sectional drawing of FIG. It is sectional drawing of the battery, and is equivalent to DD sectional drawing of FIG. It is an expanded sectional view of an electrode body, and is equivalent to the H section enlarged view of FIG. It is sectional drawing of the electrode body subassembly concerning embodiment. It is a figure explaining the process of inserting the electrode body subassembly into a case main body. It is a figure explaining the process of inserting the conventional electrode body subassembly into a case main body. It is the J section enlarged view of FIG.

Next, embodiments of the present invention will be described with reference to the drawings.
The sealed battery 100 according to the present embodiment is a rectangular parallelepiped sealed battery as shown in FIGS. 1 and 2. The sealed battery 100 is mounted on a vehicle and used as a vehicle power source for a hybrid vehicle or the like. That is, the sealed battery 100 is a battery for a vehicle driving power source.
In the cross-sectional view of FIG. 2, the electrode body 150 is shown in a side view.

  The sealed battery 100 includes an electrode body 150 and a battery case 110 that accommodates the electrode body 150. The battery case 110 has an opening 123 on the upper end side, a rectangular box-shaped case main body 120 that houses the electrode body 150, and a lid body that is positioned on the upper end side of the case main body 120 and closes the opening 123 of the case main body 120. 130 (see FIG. 2).

  The electrode body 150 has its axial direction (direction along the axis AX) aligned with the left-right direction, and the longitudinal direction of the cross section obtained by cutting the electrode body 150 in the direction orthogonal to the axial direction is aligned with the vertical direction. (In a matching direction), it is accommodated in the case body 120 (see FIGS. 2 to 5). The electrode body 150 is accommodated in the case main body 120 in a state of being inserted (accommodated) in a bag-shaped resin film 125 (electrically insulating member). As shown in FIGS. 3 to 5, the shape of the cross section of the electrode body 150 cut in a direction (vertical direction) orthogonal to the axial direction is an oval shape.

  3 is a cross-sectional view taken along the line BB in FIG. 1, and corresponds to a cross-sectional view of the sealed battery 100 at the position EE in FIG. 4 is a cross-sectional view taken along the line CC in FIG. 1, and corresponds to a cross-sectional view of the sealed battery 100 at the position FF in FIG. 5 is a cross-sectional view taken along the line DD in FIG. 1, and corresponds to a cross-sectional view of the sealed battery 100 at the position GG in FIG.

  In the present embodiment, the electrode body 150 has two planar side surfaces (the first side surface 150b and the second side surface 150c) extending in the vertical direction on the outer peripheral surface 150f of the electrically insulating member (in this embodiment, a resin film). 125) to contact the inner side surfaces (first inner side surface 120b and second inner side surface 120c) of the case body 120 via the inner side surfaces (first inner side surface 120b and second inner side surface 120c) of the case main body 120. (See FIGS. 3 to 5).

  The electrode body 150 is a flat wound body obtained by winding a sheet-like positive electrode plate 155, a negative electrode plate 156, and a separator 157 into a flat shape. The electrode body 150 includes a positive electrode mixture layer uncoated portion 155b positioned on one end side (right end side in FIG. 2) of the electrode body 150 in the left-right direction, and the other end side of the electrode body 150 in the left-right direction ( Positioned between the negative electrode mixture layer uncoated portion 156b located on the left end side in FIG. 2, the positive electrode mixture layer uncoated portion 155b, and the negative electrode mixture layer uncoated portion 156b, the positive electrode plate 155 ( A positive electrode mixture layer coating portion 155g), a negative electrode plate 156 (negative electrode mixture layer coating portion 156g), and a power generation portion 150g in which a separator 157 is wound.

  The positive electrode mixture layer uncoated portion 155b of the positive electrode plate 155 is a metal foil (in this embodiment, an aluminum foil) constituting the positive electrode plate 155 without having the positive electrode mixture layer 152 containing the positive electrode active material 153. 151). Therefore, in the electrode body 150 of this embodiment, the positive electrode mixture layer uncoated portion 155b is a portion where only the aluminum foil 151 is wound. Similarly, the negative electrode mixture layer uncoated portion 156b of the negative electrode plate 156 includes a metal foil (copper in this embodiment) that forms the negative electrode plate 156 without the negative electrode mixture layer 159 including the negative electrode active material 154. It refers to a portion consisting only of the foil 158). Therefore, in the electrode body 150 of this embodiment, the negative electrode mixture layer uncoated portion 156b is a portion where only the copper foil 158 is wound.

  On the other hand, the power generation unit 150 g includes a positive electrode mixture layer coating portion 155 g (a portion where the positive electrode mixture layer 152 including the positive electrode active material 153 is applied) of the positive electrode plate 155 and a negative electrode mixture layer coating of the negative electrode plate 156. The portion 156g (the portion where the negative electrode mixture layer 159 including the negative electrode active material 154 is applied) and the separator 157 are wound (see FIGS. 5 and 6).

  A positive electrode current collecting terminal member 134 is welded to the positive electrode plate 155 (specifically, the positive electrode mixture layer uncoated portion 155b). Specifically, a crimped portion 134 c that is one end of the positive current collecting terminal member 134 is fixed (clamped) together with the positive external terminal 138 to the lid 130, and the other end of the positive current collecting terminal member 134 is The current collector joining portion 134b, which is the end portion, of the positive electrode mixture layer uncoated portion 155b is opposed to the lid body 130 in the vertical direction 155c (the positive electrode mixture layer uncoated below the lid body 130). Welded to the upper surface of the portion 155b. Here, a welded portion between the positive electrode current collector terminal member 134 and the positive electrode mixture layer uncoated portion 155c is defined as a positive electrode current collector weld portion W1 (see FIG. 3).

  Specifically, the positive electrode current collecting terminal member 134 has a gasket 137 made of rubber or resin interposed between the lower surface of the lid 130 and is made of resin between the upper surface of the lid 130 and the positive external terminal 138. The insulating member 136 is interposed, and is fixed to the lid body 130 by the crimping portion 134c. Thereby, the positive electrode external terminal 138 is electrically connected to the positive electrode plate 155 (the positive electrode mixture layer uncoated portion 155b) through the positive electrode current collecting terminal member 134 while being electrically insulated from the lid 130. A terminal connecting bolt 132 is provided at the tip of the positive external terminal 138 (see FIG. 2).

  Moreover, the negative electrode current collection terminal member 135 is welded to the negative electrode plate 156 (specifically, the negative electrode mixture layer uncoated portion 156b). Specifically, a crimped portion 135 c that is one end portion of the negative electrode current collector terminal member 135 is fixed (clamped) together with the negative electrode external terminal 139 to the lid 130, and the other end of the negative electrode current collector terminal member 135 is The current collecting joint portion 135b which is the end portion of the negative electrode mixture layer uncoated portion 156b is opposed to the lid body 130 in the vertical direction 156c (the negative electrode mixture layer layer located below the lid body 130 is not coated) Welded to the upper surface of the portion 156b. Here, a welded portion between the negative electrode current collector terminal member 135 and the negative electrode mixture layer uncoated portion 156b is defined as a negative electrode current collector weld portion W2 (see FIG. 4).

  Specifically, the negative electrode current collecting terminal member 135 has a gasket 137 made of rubber or resin interposed between the lower surface of the lid 130 and a resin made between the upper surface of the lid 130 and the negative external terminal 139. The insulating member 136 is interposed, and is fixed to the lid body 130 by the crimping portion 135c. Thereby, the negative electrode external terminal 139 is electrically connected to the negative electrode plate 156 (negative electrode mixture layer uncoated portion 156b) through the negative electrode current collecting terminal member 135 while maintaining electrical insulation with the lid 130. A terminal connection bolt 133 is provided at the tip of the negative external terminal 139 (see FIG. 2).

  By the way, when a conventional sealed battery (for example, the battery of Patent Document 1) is used in an environment subject to vibration (for example, mounted on a vehicle as a vehicle power source of a hybrid vehicle or the like), an electrode is formed in the battery case. There was a risk that the body vibrates (particularly in the vertical direction). Due to this vibration, stress (particularly shear stress) is applied to the positive electrode current collector weld and the negative electrode current collector weld, and cracks and the like are generated in the positive electrode current collector weld and negative electrode current collector weld, thereby lowering the joint reliability. There was a fear.

  On the other hand, in the sealed battery 100 of the present embodiment, the electrode body 150 is connected to the positive electrode current collector terminal with the resin film 125 interposed between the bottom surface 150d of the electrode body 150 and the bottom portion 121 of the case body 120. It is sandwiched between the member 134 and the negative electrode current collecting terminal member 135 and the bottom 121 of the case body 120 and fixed in the battery case 110 (see FIGS. 2 to 5).

  For this reason, even when the sealed battery 100 of this embodiment is used in an environment subject to vibration (specifically, mounted in a vehicle as a vehicle power source of a hybrid vehicle or the like), the electrode in the battery case 110 is used. The vibration of the body 150 can be suppressed. Therefore, even when the sealed battery 100 of the present embodiment is used in an environment subject to vibration, “problems in which cracks and the like are generated in the positive electrode current collector welded part and the negative electrode current collector welded part due to the vibration” are suppressed. can do.

  In particular, in the sealed battery 100 of the present embodiment, the opposite surface 155c (upper surface) of the positive electrode mixture layer uncoated portion 155b is set downward by the other end portion (current collecting joint portion 134b) of the positive electrode current collecting terminal member 134. It has a structure to press. For this reason, in the positive electrode current collector welded portion W1, a force acts in a direction in which the positive electrode current collector terminal member 134 (current collector joint portion 134b) and the positive electrode mixture layer uncoated portion 155b approach each other (a direction facing vertically). (See FIG. 3).

  Similarly, the opposite end 156c (upper surface) of the negative electrode mixture layer uncoated portion 156b is pressed downward by the other end portion (current collecting joint portion 135b) of the negative electrode current collecting terminal member 135. For this reason, in the negative electrode current collector welded portion W2, a force acts in a direction in which the negative electrode current collector terminal member 135 (current collector joint portion 135b) and the negative electrode mixture layer uncoated portion 156b approach each other (a direction facing up and down). (See FIG. 4).

In the sealed battery 100 having such a structure, even if vertical vibration is applied to itself, the positive electrode current collector terminal member 134 (current collector joint part 134b) and the positive electrode mixture layer are not applied at the positive electrode current collector weld W1. Since it can suppress that the process part 155b moves to the direction which mutually spaces apart (the direction which leaves | separates up and down), the positive electrode current collection welding part W1 becomes difficult to fracture | rupture (it becomes difficult to peel off). Similarly, in the negative electrode current collector welded portion W2, the negative electrode current collector terminal member 135 (current collector joint portion 135b) and the negative electrode composite material layer uncoated portion 156b are prevented from moving in a direction away from each other (a direction away from the top and bottom). As a result, the negative electrode current collector welded portion W2 becomes difficult to break (hard to peel off).
Therefore, the sealed battery 100 of the present embodiment is a battery having high bonding reliability with respect to the positive electrode current collector welded portion W1 and the negative electrode current collector welded portion W2.

Next, a method for manufacturing the sealed battery 100 of this embodiment will be described.
First, the positive electrode mixture layer 152 including the positive electrode active material 153 is formed on the surface of the strip-shaped aluminum foil 151, and the positive electrode plate 155 is manufactured. One end portion of the aluminum foil 151 in the short direction is the positive electrode mixture layer uncoated portion 155b without forming the positive electrode mixture layer 152. Further, the negative electrode mixture layer 159 including the negative electrode active material 154 is formed on the surface of the strip-shaped copper foil 158, so that the negative electrode plate 156 is manufactured. The other end of the copper foil 158 in the short direction is the negative electrode mixture layer uncoated portion 156b without forming the negative electrode mixture layer 159. Next, the positive electrode plate 155, the negative electrode plate 156, and the separator 157 are wound to produce a flat wound electrode body 150.

  When winding the positive electrode plate 155, the negative electrode plate 156, and the separator 157, the positive electrode plate 155 so that the positive electrode mixture layer uncoated portion 155 b of the positive electrode plate 155 protrudes from one end portion of the electrode body 150. Place. Further, the negative electrode plate 156 is disposed so that the negative electrode mixture layer uncoated portion 156b of the negative electrode plate 156 protrudes from the side opposite to the positive electrode mixture layer uncoated portion 155b of the positive electrode plate 155. Thereby, in the left-right direction, an electrode body 150 is formed in which the positive electrode mixture layer uncoated portion 155b is disposed on one end side of the electrode body 150 and the negative electrode mixture layer uncoated portion 156b is disposed on the other end side. Is done.

  Next, the electrode body subassembly 160 (see FIG. 7) is manufactured. The electrode body subassembly 160 is a subassembly in which the positive electrode current collector terminal member 134 and the negative electrode current collector terminal member 135 fixed to the lid body 130 are welded to the electrode body 150.

  First, a lid body 130 having a flat plate shape made of metal and having a first lid through hole 130b and a second lid through hole 130c is prepared. Also, a positive external terminal 138 having a substantially Z-shape made of metal and having a first through hole 138b and a second through hole 128c, and a negative external terminal 139 having a first through hole 139b and a second through hole 139c are provided. prepare. In addition, an insulating member 136 integrally formed of resin and a gasket 137 made of a flat rubber plate are prepared.

  Also, a cylindrical tubular portion (a crimped portion 134c before caulking) positioned at one end thereof, a flat plate-shaped flange portion 134d positioned at the lower end side of the cylindrical portion (the crimped portion 134c), A metal positive electrode current collecting terminal member 134 having a current collecting joint 134b located at the other end is prepared. Also, a cylindrical tubular portion (rear caulking portion 135c) located at one end thereof, a flat plate-shaped flange portion 135d located at the lower end side of the tubular portion (caulking portion 135c), and the other end A metal negative electrode current collecting terminal member 135 having a current collecting joint portion 135b located in the portion is prepared.

  Next, the cylindrical portion (caulking processed portion 134c) of the positive electrode current collecting terminal member 134, from its tip side, the through hole of the gasket 137, the first lid through hole 130b of the lid body 130, the through hole of the insulating member 136, And it penetrates through the first through hole 138b of the positive electrode external terminal 138 in this order. Accordingly, the lid body 130 can be disposed between the flange 134 d of the positive electrode current collecting terminal member 134 and the positive electrode external terminal 138 via the gasket 137 and the insulating member 136. In addition, the terminal connection bolt 132 is disposed between the positive electrode external terminal 138 and the insulating member 136 while the screw portion of the terminal connection bolt 132 is inserted into the second through hole 138 c of the positive electrode external terminal 138.

  Next, the cylindrical portion (caulking portion 134c) of the positive electrode current collecting terminal member 134 is crimped. As a result, one end portion (caulking portion 134 c) of the positive electrode current collecting terminal member 134 can be fixed to the lid body 130 together with the gasket 137, the insulating member 136, the positive electrode external terminal 138, and the terminal connection bolt 132. it can. Specifically, the gasket 137, the lid 130, the insulating member 136, and the positive electrode external terminal 138 are sandwiched and fixed between the flange portion 134d and the crimped portion 134c, and the positive electrode external terminal 138 and the insulating member 136 are fixed. The terminal connecting bolt 132 can be fixed therebetween.

  Further, the cylindrical portion (caulking portion 135c) of the negative electrode current collecting terminal member 135 is formed from the tip side thereof through the through hole of the gasket 137, the second lid through hole 130c of the lid body 130, the through hole of the insulating member 136, and The first through hole 139b of the negative external terminal 139 is inserted in this order. Accordingly, the lid body 130 can be disposed between the flange portion 135 d of the negative electrode current collecting terminal member 135 and the negative electrode external terminal 139 via the gasket 137 and the insulating member 136. Further, the terminal connection bolt 133 is disposed between the negative electrode external terminal 139 and the insulating member 136 while the screw portion of the terminal connection bolt 133 is inserted into the second through hole 139 c of the negative electrode external terminal 139.

Next, the cylindrical portion (caulking portion 135c) of the negative electrode current collecting terminal member 135 is crimped. As a result, the one end portion (caulking portion 135c) of the negative electrode current collecting terminal member 135 can be fixed to the lid body 130 together with the gasket 137, the insulating member 136, the negative electrode external terminal 139, and the terminal connection bolt 133. it can. Specifically, the gasket 137, the lid 130, the insulating member 136, and the negative electrode external terminal 139 are sandwiched and fixed between the flange portion 135d and the crimped portion 135c, and the negative electrode external terminal 139 and the insulating member 136 are fixed. The terminal connecting bolt 133 can be fixed therebetween.
As described above, the lid subassembly 130SA is completed (see FIG. 7).

Next, the current collecting joint portion 134b of the positive electrode current collecting terminal member 134 and the positive electrode mixture layer uncoated portion 155b of the electrode body 150 are welded. Specifically, the current collecting joint 134b and the positive electrode composite material are in a state where the current collecting joint portion 134b of the positive electrode current collecting terminal member 134 is in pressure contact with the facing surface 155c (upper surface) of the positive electrode composite material layer uncoated portion 155b. The layer uncoated portion 155b is welded (for example, ultrasonic welding). Further, the current collecting joint portion 135b of the negative electrode current collecting terminal member 135 is in pressure contact with the opposing surface 156c (upper surface) of the negative electrode mixture layer uncoated portion 156b of the electrode body 150, and the current collecting joint portion 135b and the negative electrode joint The material layer uncoated portion 156b is welded (for example, resistance welding).
Thus, the electrode body subassembly 160 in which the lid subassembly 130SA and the electrode body 150 are joined is completed (see FIG. 7). The electrode body 150 of the electrode body subassembly 160 is inserted (accommodated) in the bag-shaped resin film 125.

  Next, as shown in FIG. 8, the lid body 130 of the electrode body subassembly 160 is pressed downward, and the electrode body 150 of the electrode body subassembly 160 is moved through the opening 123 of the case body 120. Insert (accommodate) inside. As a result, the electrode body 150 is inserted (accommodated) inside the case body 120, and the opening 123 of the case body 120 is closed by the lid body 130 (see FIGS. 2 to 5).

  By the way, in the present embodiment, as described above, while the electrode body 150 of the electrode body subassembly 160 is inserted into the case body 120, the electrode body subassembly 160 is connected to the inner side surface (first inner side of the case body 120). A force is applied upward by contacting the side surface 120b and the second inner side surface 120c). The upward force is applied to the positive electrode current collector welded portion W1 (welded portion between the positive electrode current collector terminal member 134 and the positive electrode mixture layer uncoated portion 155b) and the negative electrode current collector welded portion W2 (negative electrode current collector terminal member 135). And the negative electrode mixture layer uncoated portion 156b) (see FIG. 8).

  In particular, in the sealed battery 100 of the present embodiment, both side surfaces (first side surface 150b and second side surface 150c) of the electrode body 150 are arranged on the inner side surface of the case body 120 via an electrically insulating member (resin film 125). (The first inner side surface 120b and the second inner side surface 120c) are in contact with each other and sandwiched between the inner side surfaces (first inner side surface 120b and second inner side surface 120c) of the electrode body 150 case body 120 ( 3 to 5). That is, the thickness (the outer dimension in the left-right direction in FIG. 8) of the electrode body 150 including the resin film 125 and the inner dimension in the thickness direction of the case body 120 (the inner dimension in the left-right direction in FIG. 8) are the same. Therefore, while the electrode body 150 of the electrode body subassembly 160 is inserted into the case main body 120, the electrode body subassembly 160 is connected to the inner side surfaces of the case main body 120 (the first inner side surface 120b and the second inner side surface 120c). By contacting, it receives a large force upward.

  Here, a case where the conventional electrode body subassembly 560 is inserted into the case main body 520 will be described with reference to FIG.

  While inserting (accommodating) the electrode body 550 of the electrode body subassembly 560 into the inside of the case body 520 by pressing the lid body 530 of the electrode body subassembly 560 downward, The body subassembly 560 receives an upward force by contacting the inner side surfaces (first inner side surface 520b and second inner side surface 520c) of the case body 520. In particular, both side surfaces (first side surface 550b and second side surface 550c) of the electrode body 550 are connected to the inner side surface (first inner side surface 520b and second inner side) of the case body 520 via an electrically insulating member (resin film 125). In the case where the electrode body 550 is in contact with the side surface 520c) and is sandwiched between the inner side surfaces (the first inner side surface 520b and the second inner side surface 520c) of the case main body 520, a large force is applied upward.

  The upward force is applied to the positive electrode current collector welded portion W3 (welded portion between the positive electrode current collector terminal member 534 and the positive electrode mixture layer uncoated portion 555b) and the negative electrode current collector welded portion (negative electrode current collector terminal member and negative electrode). It acts on the welded portion with the uncoated portion of the composite layer (see FIGS. 9 and 10).

  However, in the conventional electrode body subassembly 560, unlike the electrode body subassembly 160 of the present embodiment, the positive electrode current collector terminal member 534 is connected to the side surface 555d (surface extending in the vertical direction) of the positive electrode mixture layer uncoated portion 555b. (See FIG. 9). Similarly, the negative electrode current collecting terminal member is also welded to the side surface (surface extending in the vertical direction) of the negative electrode composite material layer uncoated portion. For this reason, while the electrode body 550 of the electrode body subassembly 560 is inserted (accommodated) in the case body 520 as described above, the positive current collector terminal member 534 side (current collection) A shear stress is generated in the positive electrode current collector welded portion W3 such that the joint portion 534b side) receives a force downward, and the positive electrode mixture layer uncoated portion 555b side receives a force upward (see FIG. 10). In the same manner, shear stress is also generated in the negative electrode current collector weld. For this reason, in the positive electrode current collection weld part W3 and the negative electrode current collection weld part, a crack etc. generate | occur | produced and there exists a possibility that joining reliability may fall.

  On the other hand, in the present embodiment, one end portion (caulking portion 134c) of the positive electrode current collecting terminal member 134 is fixed to the lid body 130, and the other end portion (current collecting junction portion) of the positive electrode current collecting terminal member 134 is fixed. 134b) is welded to the facing surface 155c (upper surface of the positive electrode mixture layer uncoated portion 155b located below the lid body 130) of the positive electrode mixture layer uncoated portion 155b facing the lid 130 in the vertical direction. is doing. Furthermore, while fixing one end part (caulking process part 135c) of the negative electrode current collection terminal member 135 to the cover body 130, the other end part (current collection junction part 135b) of the negative electrode current collection terminal member 135 is made into negative electrode compound material. It welds to the opposing surface 156c (upper surface of the negative electrode compound material layer uncoated part 156b located under the cover 130) which opposes the cover body 130 among the layer uncoated parts 156b in the up-down direction.

  That is, the positive electrode current collector terminal member 134 and the positive electrode mixture layer uncoated portion 155 are welded in the vertical direction, and the negative electrode current collector terminal member 135 and the negative electrode mixture layer uncoated portion 156 are welded in the vertical direction. Has been. Therefore, the welding direction (bonding direction) between the positive electrode current collector terminal member 134 and the positive electrode mixture layer uncoated portion 155 and the weld direction between the negative electrode current collector terminal member 135 and the negative electrode mixture layer uncoated portion 156 ( The bonding direction) is a direction (vertical direction) along the insertion direction of the electrode body subassembly 160.

For this reason, in this embodiment, while the electrode body subassembly 160 is inserted (accommodated) in the case main body 120, the stress applied to the positive electrode current collector welded portion W1 and the negative electrode current collector welded portion W2 is in the shear direction of these welded portions. Does not work (works in the compression direction) (see FIG. 8). As described above, when the electrode body subassembly 160 is inserted (accommodated) in the case body 120, no shear stress is generated in the positive electrode current collector welded portion W1 and the negative electrode current collector welded portion W2. The malfunction which a crack etc. generate | occur | produce in the current collection welding part W2 can be suppressed.
Therefore, the sealed battery 100 of the present embodiment is a battery having high bonding reliability with respect to the positive electrode current collector welded portion W1 and the negative electrode current collector welded portion W2.

  Next, the electrode body 150 of the electrode body subassembly 160 is inserted (accommodated) inside the case body 120, and the lid body 130 pushes the lid body 130 of the electrode body subassembly 160 downward, while the lid body 130 causes the case body 120 to With the opening 123 closed, the lid 130 and the case main body 120 are joined together by welding all around. As a result, the electrode body 150 is connected to the positive current collecting terminal member 134, the negative current collecting terminal member 135, and the case with the resin film 125 interposed between the bottom surface 150d of the electrode body 150 and the bottom portion 121 of the case body 120. The battery case 110 can be fixed by being sandwiched between the bottom part 121 of the main body 120 (see FIGS. 2 to 5).

  Specifically, when the lid 130 and the case main body 120 are joined, the other end portion (current collection joining portion 134b) of the positive current collecting terminal member 134 is opposed to the opposing surface 155c (upper surface) of the positive electrode mixture layer uncoated portion 155b. ) Is pressed downward. As a result, in the positive electrode current collector welded portion W1, a force is exerted in a direction in which the positive electrode current collector terminal member 134 (current collector joint portion 134b) and the positive electrode mixture layer uncoated portion 155b approach each other (a direction facing vertically). A state is reached (see FIG. 3).

  Similarly, the opposite surface 156c (upper surface) of the negative electrode mixture layer uncoated portion 156b is pressed downward by the other end portion (current collecting joint portion 135b) of the negative electrode current collecting terminal member 135. As a result, in the negative electrode current collector welded portion W2, a force acts in a direction in which the negative electrode current collector terminal member 135 (current collector joint portion 135b) and the negative electrode mixture layer uncoated portion 156b approach each other (a direction in which the negative electrode mixture layer faces). A state is reached (see FIG. 4).

  The reason for this state is that before and after the electrode body 150 is inserted into the case body 120, the upper and lower sides between the lower surface of the lid body 130 and the bottom surface 150 d of the electrode body 150 are covered with the electrode body subassembly 160. The direction dimension (that is, the vertical dimension of the portion accommodated in the case main body 120) is slightly larger than the depth of the case main body 120 (the vertical dimension between the opening end surface and the bottom surface of the case main body 120). Because there is.

  With such a structure, even when the sealed battery 100 of the present embodiment is used in an environment subject to vibration (specifically, mounted in a vehicle as a vehicle power source of a hybrid vehicle or the like) It is possible to suppress the electrode body 150 from vibrating in the battery case 110. Furthermore, even if vertical vibration is applied to the sealed battery 100, the positive electrode current collector welded portion W1 and the negative electrode current collector welded portion W2 are not easily broken (not easily peeled off). Therefore, the sealed battery 100 of the present embodiment is a battery with higher bonding reliability with respect to the positive electrode current collector welded portion W1 and the negative electrode current collector welded portion W2.

  Next, an electrolytic solution is injected into the case body 120 through a liquid injection port (not shown), and then the liquid injection port is sealed. Then, the sealed battery 100 of this embodiment is completed by performing a predetermined process.

  In the above, the present invention has been described with reference to the embodiments. However, the present invention is not limited to the above embodiments, and it is needless to say that the present invention can be appropriately modified and applied without departing from the gist thereof.

DESCRIPTION OF SYMBOLS 100 Sealed battery 110 Battery case 120 Case main body 120b Case main body first inner side surface 120c Case main body second inner side surface 121 Case main body bottom 125 Resin film (electrically insulating member)
130 Lid 134 Positive Current Collection Terminal Member 134b The Other End (Current Collection Joint) of the Positive Current Collection Terminal Member
134c One end portion of the positive electrode current collecting terminal member (crimping portion)
135 Negative electrode current collector terminal member 135b The other end of the negative electrode current collector terminal member (current collector junction)
135c One end portion of the negative electrode current collecting terminal member (crimping portion)
150 Electrode body 150b First side surface 150c of electrode body Second side surface 150d of electrode body Bottom surface 155 of electrode body Positive electrode plate 155b Positive electrode mixture layer uncoated portion 155c Opposite surface (upper surface) of positive electrode mixture layer uncoated portion
156 Negative electrode plate 156b Negative electrode mixture layer uncoated portion 156c Opposite surface (upper surface) of negative electrode mixture layer uncoated portion
157 Separator W1 Positive current collector weld W2 Negative current collector weld

Claims (3)

An electrode body obtained by winding a positive electrode plate, a negative electrode plate, and a separator into a flat shape;
A positive electrode current collector terminal member welded to the positive electrode plate;
A negative electrode current collecting terminal member welded to the negative electrode plate;
A rectangular box shape having an opening on the upper end side, and a case main body for accommodating the electrode body,
A lid that is located on the upper end side of the case body and closes the opening of the case body,
The electrode body is
A sealed type that is accommodated in the case main body so that its axial direction coincides with the left-right direction, and the longitudinal direction of the cross section obtained by cutting the electrode body in the direction orthogonal to the axial direction coincides with the vertical direction. A battery,
The positive electrode plate has a coating portion of a positive electrode mixture layer containing a positive electrode active material, and a positive electrode mixture layer uncoated portion,
The negative electrode plate has a coated portion of a negative electrode mixture layer containing a negative electrode active material, and a negative electrode mixture layer uncoated portion,
The electrode body, in the left-right direction, the positive electrode mixture layer uncoated part is disposed on one end side of the electrode body, and the negative electrode mixture layer uncoated part is disposed on the other end side,
The positive current collecting terminal member is
One end thereof is fixed to the lid,
The other end is welded to the facing surface facing the lid in the vertical direction in the positive electrode mixture layer uncoated portion,
The negative electrode current collector terminal member is
One end thereof is fixed to the lid,
A sealed battery in which the other end is welded to a facing surface of the negative electrode composite material layer uncoated portion facing the lid in the vertical direction. The sealed battery according to claim 1,
While pressing the opposite surface of the positive electrode mixture layer uncoated portion downward by the other end of the positive electrode current collector terminal member,
By pressing the facing surface of the negative electrode mixture layer uncoated portion downward with the other end of the negative electrode current collecting terminal member,
The electrode body is directly or in a state where an electrically insulating member is interposed between the bottom surface of the electrode body and the bottom of the case body, and the positive current collecting terminal member, the negative current collecting terminal member, and the A sealed battery that is sandwiched and fixed between the bottom of the case body. The sealed battery according to claim 2,
The sealed battery is a sealed battery that is a battery for a vehicle driving power source.

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