JP2012043578A - Battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a scattered body entering the inside from between a container body of a battery housing a stack and a lid from reaching the stack when the container body and the lid are sealed.SOLUTION: A battery includes the stack in which a first electrode plate and a second electrode plate are stacked with a separator therebetween; the container body which has an opening and houses the stack from the opening; the lid which has an electrode terminal electrically connected to the first electrode plate or second electrode plate, and seals the container body with a sealing part; and a protection plate which has an insulating plate in substantially the same shape with the opening, and is housed in the container body. The protection plate is housed on the side of the stack with respect to the sealing part, and substantially covers the opening.

Description

  The present invention relates to a battery including a laminate in which a positive electrode plate and a negative electrode plate are laminated via a separator.

A battery in which electrode plates (a positive electrode plate and a negative electrode plate) are stacked via a separator includes a stacked battery in which a plurality of positive plates, a plurality of separators, and a plurality of negative plates are sequentially stacked, and one positive electrode. It is broadly classified into a wound battery having a configuration in which a plate and one negative electrode plate are stacked via a separator and wound. In any battery, the laminated body thus laminated is accommodated in a battery container and sealed (the member constituting the battery container, that is, the container body having an opening and the lid are used to open the container body). Is sealed with a lid).
Examples of battery containers include plastic containers and metal containers. Among these, particularly in a metal container, the container body and the lid are generally welded by a laser or the like. At the time of welding, high energy may be applied from the outside of the battery container, and high-temperature spatter may enter the battery container in which the laminate is accommodated. In this case, for example, there is a possibility that the battery performance may be deteriorated by high-temperature sputtering touching the laminated body or sputtering mixed into the laminated body.
Therefore, in order to prevent such battery performance deterioration, in the battery of Patent Document 1, a dust receiver that prevents the arrival of sputtering or the like on the laminate is disposed inside the battery container.

JP 2009-259451 A

However, in the battery described in Patent Document 1, it has not been possible to sufficiently prevent the arrival of sputtering or the like to the above-described laminate housed in the battery container.
An outline of the configuration described in Patent Document 1 will be described with reference to FIG. FIG. 7 is a schematic view in which a “main body” 101 including a “dust receiver” 102 is disposed at a predetermined position inside a container main body (“case main body”) 100 in accordance with the description in Patent Document 1 (inside “”). The term described in Patent Document 1 is used as it is).
Sputters generated when the container main body 100 is welded to a lid (not shown) because the dust receivers 102 arranged on the three sides of the rectangular main body 101 are in contact with the corresponding surfaces of the container main body 100, respectively. Are received by the dust receiver 102. Accordingly, it is possible to prevent spattering and the like from reaching the laminated body.
However, in spite of the fact that spatter and the like occur in the vicinity of the central portion of the battery case during welding, in Patent Document 1, the central portion of the battery case is disclosed because the adhesion between the lid and the container body is high. Does not have the dust receiver 102 disposed thereon. For this reason, the above-mentioned arrival such as sputtering near the center of the battery container cannot be sufficiently prevented.
In addition, since the dust receivers 102 are arranged on the three sides of the rectangular main body 101, two dust receivers arranged on two adjacent sides of the three sides are provided near the corner of the battery container. A space 103 that cannot be covered by 102 is inevitably generated. That is, it is not possible to sufficiently prevent the above-described arrival of sputtering or the like passing through the space 103.
Further, after welding, the battery is generally transported as a product. However, in the configuration of Patent Document 1, spatter and the like that are disturbed by the dust receiver 102 and remain on the dust receiver 102 are also transported. Due to vibration or the like, the dust receiver 102 falls from the both sides of the dust receiver 102 onto the laminated body inside the battery container, and as a result, the arrival of sputtering or the like on the laminated body cannot be sufficiently prevented.
In addition, when the dust receiver that receives the spatter and the like flying at a high temperature is a material that is easily pyrolyzed, the spatter and the like penetrate the dust receiver and still cannot sufficiently prevent the arrival.
That is, the configuration is still insufficient from the viewpoint of preventing deterioration of battery performance.

  Therefore, the present invention reduces the performance degradation that may occur when the scattered matter inside the battery container such as spatter generated in the process of sealing the lid and the container body by welding, heat welding, bonding, etc. reaches the laminate. An object is to provide a battery that is sufficiently prevented and has excellent performance.

  In order to solve the above problems, the battery of the present invention includes a laminate in which a first electrode plate and a second electrode plate are laminated via a separator, and an opening, and the laminate is accommodated from the opening. A container body; an electrode terminal electrically connected to the first electrode plate or the second electrode plate; a lid that seals the container body with a sealed portion; and an insulation having substantially the same shape as the opening. And a protective plate accommodated in the container body, wherein the protective plate is accommodated on the side of the laminate rather than the sealing portion and substantially covers the opening. To do.

  In the battery of the present invention, a protective plate provided with an insulating plate having substantially the same shape as the opening is provided on the side of the laminated body in the container body from the sealed portion. The scattered matter that scatters or intrudes from the sealed portion is blocked by the protective plate, and is prevented from reaching the laminated body. Therefore, it is possible to prevent the scattered matter from touching the laminated body or the scattered matter from being mixed into the laminated body.

  In the present invention, it is possible to provide a battery having excellent performance by sufficiently preventing the deterioration of performance that may occur when the scattered matter generated during sealing reaches the laminated body accommodated in the battery container.

It is a perspective view (perspective view) of the battery of the first embodiment. FIG. 2 is a cross-sectional view of the battery of FIG. 1 (a view of a ZX plane including an AA ′ line). FIG. 3 is a view of the battery lid of FIG. 1 (FIG. 3A: view of ZX plane including AA ′ line before riveting) and a container body (FIG. 3B: perspective view). FIG. 4 is a diagram of a protective plate (FIG. 4A: a top view viewed from the + Z direction, FIG. 4B: a cross-sectional view of the ZY plane along the line BB ′) used in the battery of FIG. 1. Protective plate used in the battery of the second embodiment (FIG. 5 (a): top view as seen from the + Z direction, FIG. 5 (b): sectional view of the ZY plane along line CC ′, FIG. 5 (c): It is a figure of ZY plane sectional view in the CC 'line of a protection board which changed when a protection board was inserted in a container main part. Protective plate used in the battery of the third embodiment (FIG. 6A: bottom view seen from −Z direction, FIG. 6B: top view seen from + Z direction, FIG. 6C: DD It is a figure of sectional drawing of the ZY plane in line '. It is the schematic which shows the structure as described in patent document 1. FIG.

  Hereinafter, first to third embodiments of the battery of the present invention will be described in detail with reference to the drawings. The present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention.

(First embodiment)
First, the battery according to the first embodiment of the present invention will be described with reference to FIGS. Here, taking as an example a stacked lithium ion secondary battery composed of a rectangular battery container as a battery, the positional relationship of each part will be described with reference to an XYZ orthogonal coordinate system shown in each drawing. The X direction is the stacking direction of the electrode plates, the Z direction is the direction in which the electrode tab protrudes from the electrode plate, and the Y direction is the direction perpendicular to the X direction and the Z direction.

FIG. 1 shows a perspective view (perspective view) of a battery 1 of the present embodiment. The battery 1 includes a container body 2, a lid 3, an electrode plate 4 (a negative electrode plate 41 (for example, also referred to as a second electrode plate), a positive electrode plate 42 (for example, also referred to as a first electrode plate)), an electrode tab 5, and a separator 6. , Electrode lead 7, electrode terminal 8 (negative electrode terminal 81, positive electrode terminal 82) and protective plate 12 (not shown in FIG. 1). Here, since the battery container is described as a metal container, the container body 2 and the lid 3 are made of metal such as aluminum, for example.
In the battery 1 of the present embodiment, a plurality of negative plates 41, separators 6 and positive plates 42 are sequentially stacked in the X direction to form one electrode unit 10, and three electrode units 10 are sequentially stacked in the X direction to form electrodes. The body 11 is formed. Here, the electrode unit 10 or the electrode body 11 is typically referred to as a laminated body, but a set of battery elements in which one negative electrode plate 41, one separator 6, and one positive electrode plate 42 are sequentially laminated are also laminated bodies. . Although not shown, since the battery container is a metal container as described above, an insulating plate (for example, the material is made of the material) so that the electrode unit 10 or the electrode body 11 is not in direct contact with the container body 2. A plastic resin such as polyethylene or polypropylene) is appropriately disposed.
In addition, as a connection member for electrically connecting the electrode plate 4 and the electrode terminal 8, when the electrode tab 5 is directly connected to the corresponding electrode terminal 8, or via the electrode lead 7, the electrode plate 4 and the electrode terminal 4 are connected thereto. There may be a case where the corresponding electrode terminal 8 is connected. Although an example using the electrode lead 7 will be described here, the electrode tab 5 may be directly connected to the corresponding electrode terminal 8 in the same manner as in the description of the example.
Further, in order to facilitate understanding of the basic configuration inside the battery 1, a protection plate 12 described later is not shown in FIG. 1, but the arrangement of the protection plate 12 can be understood from FIG. 2. As will be described in detail later, the protective plate 12 having substantially the same shape as the XY cross-sectional shape of the container body 2 is fixed to the lid 3 by the insulator 9 in the center portion of the hole formed in the lid 3 and the lid. 3 is inserted into a cylindrical electrode terminal 8 that is electrically insulated from 3 and disposed between the electrode lead 7 and the lid 3 inside the container body 3. 2 is a cross-sectional view taken along the ZX plane including the AA ′ line of the battery of FIG.

The electrode tabs 5 protruding from the edges in the + Z direction of the plurality of negative electrode plates 41 are bent and bundled substantially vertically in the −X direction for each electrode unit 10. The bundled electrode tabs 5 are bent substantially vertically in the + Z direction at the edge position in the −X direction of each electrode plate unit 10, and the electrode lead 7 corresponding to each electrode unit 10 and ultrasonic welding, etc. Connected with. The electrode tabs 5 of the plurality of positive plates 42 are similarly bundled and connected to the corresponding electrode leads 7. Note that two electrode leads 7 for the positive electrode and the negative electrode are provided for one electrode unit 10.
Then, after the three electrode units 10 are laminated, the electrode leads 7 of the corresponding polarities (positive electrode or negative electrode) are bundled together and fixed to the corresponding electrode terminals 8 via the protective plate 12. Electrically connected. For the fixing, screws or the like may be used, but riveting is desirable so that metal powder is not generated as much as possible.

  FIG. 3A shows a cross-sectional view of the lid 3 and the like shown in FIG. The electrode terminal 8 having a cylindrical portion having a substantially circular cross section with a diameter L1 at one end has a cylindrical portion having a substantially circular cross section with a diameter L2 at the other end (note that L1 > L2 and the center axes of all the cylindrical portions are substantially the same). Such a shape can be easily formed by appropriately cutting one end of a cylindrical metal rod having a diameter L1 so as to have a diameter L2.

A through hole that is substantially the same as or slightly larger than the circle of diameter L2 is formed at one end of each electrode lead 7 that is electrically connected to the corresponding electrode terminal 8. First, as will be described later, a protective plate 12 having a through hole that is substantially the same as or slightly larger than the circle of diameter L1 (or a through hole that is substantially the same as or slightly larger than the circle of diameter L2). Pass through the other end of the electrode terminal 8, and then pass the through hole of each electrode lead 7 corresponding to the electrode terminal 8 from the other end of the electrode terminal 8, and substantially the same as a circle having a diameter L2 or A washer (washer) 13 having a through hole slightly larger than the circle is passed through the other end of the electrode terminal 8 and then the other end is crushed so that each electrode lead 7 is connected to the corresponding electrode terminal 8. Fixed and electrically connected.
After the electrode lead 7 is connected to the electrode terminal 8 in this way, the electrode lead 7 is folded in an even number of times in a meandering manner as shown in FIGS. 1 and 2 and the laminate is accommodated in the container body 2. The sealed battery 1 is formed by welding the lid 3 and the container body 2. Of course, an electrolytic solution or the like can be placed in the battery container.

In the battery 1 of FIGS. 1 and 2, the bundled electrode leads 7 are folded twice in an S shape and accommodated in a battery container.
As described above, since the plurality of electrode leads 7 (positive electrode lead and negative electrode lead) are folded twice in an S shape, both ends of the electrode leads 7 are respectively connected to the electrode tab 5 and the electrode terminal. 8 can be prevented from being bent when it is folded in a state of being connected and fixed in advance to the electrode 8, and the electrode lead 7 itself or damage to the electrode tab 5 or the electrode terminal 8 at both ends thereof can be damaged. Can be prevented.
More specifically, the positive electrode electrode 7 and the negative electrode lead 7 bundled with each other have one end on the electrode tab 5 and the other end on the electrode terminal 8 before being folded into an S shape. Is connected and fixed. From this state, when the positive and negative electrode leads 7 are bent in a U-shape, both ends of the electrode leads 7 are fixed. Therefore, stress (electrode leads located at the center of the bundle of electrode leads 7) is applied to each connection portion. 7, the outer electrode lead generates a tensile force, and the inner electrode lead generates a compressive force. The stress generated in the connection portion increases as the distance from the center of the bundle of electrode leads 7 increases.
After that, when the U-shaped bending is performed once again to obtain an S-shape, the positive electrode electrode electrode 7 and the negative electrode electrode lead 7 are bent twice. It receives compressive force by bending. As a result, the stress generated in the connection portion is canceled out.
Therefore, by bending the electrode leads 7 for the positive electrode and the negative electrode in an S shape, the stress generated in the vicinity of the connection portion of the electrode lead 7 can be offset and damage to the connection portion can be prevented. Further, by bending a plurality of positive electrode or negative electrode leads, that is, a plurality of electrode leads having the same polarity, and bending them at the same time, it is possible to prevent bending of the electrode lead 7.

Next, the configuration of the protection plate 12 will be described in detail.
4A is a top view of the protective plate 12 viewed from the + Z direction in FIGS. 1 and 2, and FIG. 4B is a cross-sectional view of the ZY plane along the line BB ′ in FIG. 4A. FIG. 3B shows a view in which only the container main body 2 is taken out from the perspective view of FIG. As described above, since the protection plate 12 is accommodated in the container body 2, the shape of the opening of the container body 2, that is, the shape of the substantially rectangular inner wall in the XY cross section is substantially the same (battery container 2, any location on the Z-axis that forms an opening with a substantially rectangular inner wall in the XY cross section is referred to as an opening). Therefore, when the positive electrode terminal 82 and the negative electrode terminal 81 are arranged along the Y axis as shown in FIG. 1, the inner method (of which the long side direction of the XY cross section in FIG. Glue) Corresponding to the inner method L3 in L4 and the X-axis direction (in FIG. 1, the short side direction of the XY cross section in FIG. 1), the protective plate 12 is substantially the same as or slightly smaller than the inner method L4 as shown in FIG. The dimension L4 ′ and the inner method L3 are substantially the same or slightly smaller than the dimension L3 ′.
The protective plate 12 having such dimensions is integrally formed by fitting the metal frame 15 and the insulating plate 14 as shown in FIG. In other words, it is a structure in which the metal of the metal frame 15 covers at least the periphery of one surface of the insulating plate 14.
First, the metal frame 15 has a substantially rectangular planar shape in which the dimensions of two adjacent sides on the XY plane are a dimension L3 ′ and a dimension L4 ′, respectively, and the thickness is a dimension (L7) / 2. The metal frame 15 is a high melting point metal (high melting point metal such as copper) that can be received on this surface even if the scattered matter is a high-temperature object such as spatter, and the scattered matter reaches the laminated body. In order to obtain a constant thickness that can be sufficiently prevented, it is desirable that (L7) /2≧1.5 mm. The metal frame 15 is provided with a substantially elliptical through-hole for fitting an insulating plate 14 to be described later when viewed from the XY plane. For example, when the metal frame 15 is formed by punching a metal plate with a predetermined mold, the through hole can be formed at the same time by appropriately designing the mold.
Next, the insulating plate 14 has a substantially rectangular shape in which the dimensions of two adjacent sides on the XY plane are the dimensions L3 ′ and L4 ′, respectively, and is a portion where the metal frame 15 is installed, that is, the substantially rectangular shape. The thickness of the peripheral portion of the shape is dimension (L7) / 2, and the thickness of the portion fitted into the through hole of the metal frame 15, that is, the central portion of the substantially rectangular shape is dimension L7. A through hole 16 for inserting the electrode terminal 8 (the positive terminal 82 and the negative terminal 81) is formed in the insulating plate 14 at a position corresponding to the central portion. The thickness difference (becomes a step) between the through hole 16 and the central portion and the peripheral portion is, for example, when a plastic resin such as polyethylene or polypropylene is poured into a predetermined mold to form the insulating plate 14. By designing the mold appropriately, it can be formed simultaneously and appropriately.

The through-hole 16 is a substantially circular hole having a diameter L5 on the XY plane for inserting the electrode terminal 8. As described above (see FIG. 3A), the electrode terminal 8 has a cylindrical portion having a substantially circular cross section with a diameter L1 at one end (hereinafter referred to as a terminal portion) and a diameter L2 at the other end. A cylindrical portion (hereinafter referred to as a rivet portion) having a circular cross section and having substantially the same central axis as the terminal portion is provided. Therefore, the protection plate 12 can be configured to be inserted into the terminal portion of the electrode terminal 8 with the dimension L5 of the through hole 16 being substantially the same as or slightly larger than the dimension L1, and the dimension of the through hole 16 is also possible. L5 may be inserted into the rivet portion of the electrode terminal 8 as a dimension substantially the same as or slightly larger than the dimension L2 (in this case, L5 <L1).
When the dimension L5 of the through-hole 16 in the protection plate 12 is inserted into the terminal portion of the electrode terminal 8 as substantially the same as or slightly larger than the dimension L1, the top surface of the protection plate 12 (FIG. 4A). The surface shown in (2) can be placed in contact with the insulator 9 of the lid 3, which is suitable for downsizing. Even if the protective plate 12 is brought into contact with the insulator 9 as described above, the insulator 9 is formed so as to sandwich the lid 3 in the hole formed in the lid 3 as shown in FIG. The metal frame 15 of the protection plate 12 does not contact the lid 3.
On the other hand, the dimension L5 of the through hole 16 in the protective plate 12 is substantially the same as or slightly larger than the dimension L2 (however, in this case, L5 <L1) and is inserted into the terminal portion of the electrode terminal 8. In this case, the protective plate 12 is fixed to the electrode terminal 8 together with the lead 7 by riveting while contacting the electrode lead 7 on the lower surface (the surface viewed in the + Z direction in FIG. 4B). Therefore, the protective plate 12 is further parallel to the cross section (XY plane) of the container body 2 as compared with the case where the dimension L5 of the through hole 16 in the protective plate 12 is substantially the same as or slightly larger than the dimension L1. And since it can arrange | position more firmly, the clearance gap between the protection board 12 and the inner wall of the container main body 2 can be made as small as possible. Therefore, it is possible to more effectively prevent the scattered matter from reaching the laminated body. In this case, since the upper surface of the protective plate 12 is in contact with the electrode terminal 8, the metal frame 15 and the electrode terminal 8 are in contact with each other in the XY plane of FIG. The shortest dimension L6 from the end of the through hole 16 to the metal frame 15 is L6> (L1-L2) / 2.

The battery 1 having the above-described configuration is such that the opening of the container main body 2, that is, the cross section of the inner wall of the container main body 2 is entirely covered substantially by the protective plate 12 disposed between the laminate and the electrode terminal 8. Can be covered without any gaps. Further, the protection plate 12 is accommodated and arranged on the laminated body side from a contact portion (referred to as a sealing portion) between the container body 2 and the lid 3 when the opening of the container body 2 is sealed with the lid 3. Therefore, when the battery container is sealed, scattered matter that scatters and enters from the sealed portion into the container body can be effectively prevented from reaching the laminated body by the protective plate 12. In addition, since the entire surface is covered as described above, even when the battery 1 is transported after welding, the scattered matter that has been prevented from advancing by the protective plate 12 is further transferred from the protective plate 12 to the container body 2. It is prevented from entering the inside and reaching the laminated body.
In addition, when the opening of the container body 2 is sealed with the lid 3, the metal frame 15 covering at least the periphery of one surface of the insulating plate 14 of the protective plate 12 is used even if the scattered matter scattered from the sealed portion is high temperature. Since the progress is mainly blocked, the heat of the scattered matter is conducted to the entire surface of the metal frame 15. Therefore, it is possible to prevent the protective plate 12 from being locally heated and damaged (a part of the protective plate 12 is thermally decomposed or melted by heat, etc.) to prevent the scattered matter from reaching the laminate from the damaged portion. it can. When the insulating plate 14 is made of a high melting point material (for example, a plastic resin such as polyamide or Teflon (registered trademark)), the same effect may be obtained without arranging the metal frame 15. .
Therefore, since the scattered matter can be prevented from reaching the laminated body when the battery container is sealed, the battery 1 having excellent battery performance can be provided.

(Second embodiment)
A battery according to a second embodiment of the present invention will be described. This battery has basically the same configuration as the battery 1 of the first embodiment, and the difference is that a protection plate 12a shown in FIG. 5 is used instead of the protection plate 12 shown in FIG. . The arrangement of the protection plate 12 a is the same as the arrangement of the protection plate 12 in the battery 1. The parts having the same configuration and the configuration having the same reference numerals are the same as those in the first embodiment, and thus detailed description thereof is omitted. Hereinafter, the protection plate 12a that is different from the first embodiment will be described in detail.

FIG. 5A is a top view of the protective plate 12a viewed from the + Z direction, and FIG. 5B is a cross-sectional view of the ZY plane taken along the line CC ′ of FIG. FIG. 5C is a cross-sectional view of the ZY plane of the protective plate deformed when the protective plate 12a is inserted and arranged in the container body 2 along the line CC ′.
The protective plate 12a is the same as the protective plate 12 of FIG. 4 in that the insulating plate 14 and the metal frame 15a are fitted and integrated as shown in FIG. By using, it is possible to more effectively prevent the scattered matter from reaching the laminated body as compared with the battery of the first embodiment.

As shown in FIG. 4A, the metal frame 15a is a substantially rectangular plane in which the dimensions of two adjacent sides on the XY plane are a dimension L8 slightly smaller than the dimension L3 ′ and a dimension L9 slightly smaller than the dimension L4 ′. The metal frame main body α having a shape and two first deformations extending from the two sides having the dimension L8 out of the sides of the metal frame main body α to the outside (Y direction) of the metal frame main body α. And two second deformable portions extending from each of the two sides having the dimension L9 out of the sides of the metal frame main body α to the outside (X direction) of the metal frame main body α.
The first deformed portion has a substantially rectangular planar shape in which the dimensions of two adjacent sides on the XY plane are the dimensions L8 and L10, respectively, and the side of the dimension L8 of the first deformed portion is the dimension of the metal frame main body α. It is joined to the side of L8.
The second deforming portion has a substantially rectangular planar shape in which the dimensions of two adjacent sides on the XY plane are the dimensions L9 and L10, respectively, and the side of the dimension L9 of the second deforming portion is the dimension of the metal frame main body α. It is joined to the side of L9.
Here, “joining” means not only when two separately prepared members are joined together by welding or the like, but also when two members are die-cut as described later. This also includes the case where the members seem to be connected together.
Similar to the protection plate 12 of FIG. 4, the metal frame main body α of the metal frame 15 a is provided with a substantially elliptical through-hole for fitting the insulating plate 14 when viewed from the XY plane. The formation of this through hole and the structure in which the metal frame main body α and the first and second deformed portions are integrally joined, that is, the shape of the metal frame 15a shown in FIG. The plates can be formed simultaneously by punching with a predetermined mold.

  The portion of the metal frame 15a where the metal frame main body α is joined to the first and second deformed portions (joint portion) is perpendicular to the plane where the metal frame main body α is placed as the rotation axis. In order to make it easy to bend the first and second deformed portions in the (+ Z direction), a bent portion 17 such as a groove is formed. When the bent portion 17 is, for example, a groove, when the metal frame 15a is formed by punching one metal plate with a predetermined mold as described above, the groove is appropriately designed. Can be formed simultaneously.

  The thickness of the metal frame 15a is dimension (L7) / 2. Similar to the metal frame 15 of the protective plate 12 shown in FIG. 4, this metal frame 15a is a refractory metal (for example, copper or the like) that can catch on this surface even if the scattered material is a high-temperature object such as spatter. ). In addition, it is desirable that (L7) /2≧1.5 mm so that the scattered matter can be sufficiently prevented from reaching the laminated body. Further, when the protective plate 12a is inserted into the container body, the first and second deformed portions bent as shown in FIG. 5 (c) can firmly contact the inner wall of the container body with a spring property. Thus, the thickness (Z direction) of the metal portion of the bent portion 17 is desirably 1.0 mm or more.

Similar to the battery of the first embodiment, the battery of the present embodiment is completely substantially entirely, particularly the insulating plate 14 of the protective plate 12a that is accommodated and arranged on the side of the laminated body with respect to the sealed portion. Therefore, when the battery container is sealed, it is possible to effectively prevent the scattered matter that enters the container body from the sealed portion from reaching the laminated body. In addition, since the entire surface is covered as described above, even when the battery is transported after welding, the scattered matter that is prevented from advancing by the protection plate 12a is further removed from the protection plate 12a to the inside of the container body 2. Intrusion is prevented.
Moreover, even if the flying object is high in temperature, the metal frame 15a of the protection plate 12a mainly blocks the progress, so that the heat of the flying object is conducted to the entire surface of the metal frame 15a. Therefore, it is possible to prevent the protection plate 12a from being locally heated to be damaged (a part of the protection plate 12a is thermally decomposed or melted by heat, etc.) and the scattered matter from reaching the laminated body from the damaged portion. it can. The insulating plate 14 is more effective when formed of a high melting point material (for example, a plastic resin such as polyamide or Teflon (registered trademark)).
In addition, since the first and second deformed portions of the metal frame 15a are firmly in contact with the inner wall of the container body 2 with springiness, the inner wall of the container body 2 and the insulating plate 14 of the protection plate 12a Can be tightly closed. Therefore, compared with the protection plate 12 in the battery of the first embodiment, it is possible to more effectively prevent the scattered matter from reaching the laminated body.
That is, it is possible to more effectively prevent the scattered matter from reaching the laminated body when the battery container is sealed than the battery of the first embodiment. Therefore, a battery with further excellent battery performance can be provided.

(Third embodiment)
A battery according to a third embodiment of the present invention will be described. This battery has basically the same configuration as the battery of the second embodiment, and the difference from the battery of the second embodiment is that a protection plate 12b shown in FIG. 6 is used instead of the protection plate 12a shown in FIG. It is the point used. The arrangement of the protection plate 12b is the same as the arrangement of the protection plate 12a. The parts having the same configuration and the configuration having the same reference numerals are the same as those in the second embodiment, and thus detailed description thereof is omitted. Hereinafter, the protection plate 12b which is different from the second embodiment will be described in detail.
6A is a bottom view of the protective plate 12b viewed from the −Z direction, and FIG. 6B is a top view of the protective plate 12b viewed from the + Z direction. FIG. 6C is a cross-sectional view on the ZY plane of the protective plate 12b taken along the line DD ′ in FIG.
The protective plate 12b is the same as the protective plate 12a in FIG. 5 in that the insulating plate 14a and the metal frame 15b are integrally formed as shown in FIG. 6, but the metal frame 15b is used instead of the metal frame 15a. The difference is that the insulating plate 14 a is used instead of the insulating plate 14.

  The insulating plate 14a has a substantially rectangular shape in which the dimensions of two adjacent sides on the XY plane are the dimensions L3 ′ and L4 ′, respectively. Is formed). As shown in FIG. 6B, the insulating protrusion has a substantially circular shape with a diameter L11 when viewed in the XY plane. A through hole (a substantially circular shape having a diameter L5 when viewed in the XY plane) is formed in the insulating convex portion so as to insert the negative electrode terminal 81. The through hole is coaxial with the substantially circular central axis. If the dimension L6 is used, L11 = L5 + 2 × L6. As viewed in the ZY plane, the thickness of the portion of the insulating plate 14a other than the insulating convex portion is dimension (L7) / 2. A portion of the insulating plate 14a having a dimension (L7) / 2 is formed with a through-hole (a substantially circular shape having a diameter L12 when viewed in the XY plane) for fitting a metal protrusion described later. The shape of the insulating plate 14 a can be formed by molding as with the insulating plate 14.

Similarly to the metal frame 15a of the protective plate 12a, the metal frame 15b is a substantially rectangular plane in which the dimensions of two adjacent sides on the XY plane are a dimension L8 slightly smaller than the dimension L3 ′ and a dimension L9 slightly smaller than the dimension L4 ′. The metal frame main body β having a shape and two first deformations extending from each of the two sides having the dimension L8 out of the sides of the metal frame main body β to the outside (Y direction) of the metal frame main body β And two second deformable portions extending from each of the two sides having the dimension L9 out of the sides of the metal frame main body portion to the outside (X direction) of the metal frame main body portion β.
The difference between the metal frame 15b in FIG. 6 and the metal frame 15a in FIG. 5 is that the shapes of the metal frame main body portions, that is, the metal frame main body portion β and the metal frame main body portion α, are different from each other. The other points including the joining relationship between the first and second deformable portions to the metal frame main body portion and the deformation at the bent portion 17 are the same as those of the metal frame 15a in FIG.
The metal frame main body β is formed with a convex portion (referred to as a metallic convex portion) having a thickness L7 when viewed from the ZY plane. As shown in FIG. 6A, the metal protrusion has a substantially circular shape having a diameter L12 when viewed in the XY plane. A through hole (a substantially circular shape having a diameter L5 when viewed in the XY plane) coaxial with the substantially circular central axis is formed for inserting the positive electrode terminal 82 (L12> L5).
When the width of the electrode lead 7 to be electrically connected by coming into contact with the metal convex portion of the protective plate 12b from the lower surface is defined as a dimension W, L12 ≦ W is designed. This is for avoiding that the metal convex portion contacts a portion other than the electrode lead 7 in the battery container. Here, L12 = L11 is illustrated.
The thickness of the part other than the metal convex part of the metal frame main body part β is the dimension (L7) / 2. A through-hole (a substantially circular shape having a diameter L11 when viewed in the XY plane) for fitting the above-described insulating convex portion is formed in a portion where the thickness of the metal frame main body β is the dimension (L7) / 2. .
The shape of the metal frame 15b can be formed at the same time by, for example, appropriately designing two molds that press and punch a single metal plate placed on the XY plane from both sides of the metal plate in the Z direction. it can.

Since the battery using such a protective plate 12b can be covered completely with the protective plate 12b housed and arranged on the side of the laminate rather than the hermetically sealed portion, it is described in the battery of the second embodiment. Similar effects can be obtained. The insulating plate 14a of the protective plate 12b is still more effective when formed of a high melting point material (for example, a plastic resin such as polyamide or Teflon (registered trademark)).
Further, the first and second deformed portions of the metal frame 15b of the protection plate 12b are not only in firm contact with the inner wall of the container body 2 with springiness, but also the metal protrusions exposed on the lower surface of the protection plate 12b. When the battery container is a metal container, the electrode lead 7 for the positive electrode is connected to the positive electrode via the metal protrusion. It can be electrically connected to the battery container. That is, the battery container can be set to the positive electrode potential of the battery (referred to as pull-up). Therefore, it is possible to prevent the deterioration of the battery container. For example, when the battery of this embodiment is a lithium ion secondary battery using a metal container made of aluminum, the battery container can be prevented from alloying with LiAl, and as a result, deterioration of battery performance can be prevented. can do.
In addition, as a material of the metal frame 15b of the protection plate 12b, not only a high melting point metal such as copper but also a metal having a high electric resistance such as nichrome (high resistance metal) can be used. If the metal frame 15b is formed of a high-resistance metal, the battery container is a metal container, and the battery container unexpectedly comes into contact with another device or the like, so that current flows between the battery container and the other device. Even when it flows, the amount of the current is very small, and can contribute to improvement of safety. Compared to the case where the positive terminal and the battery container are connected to each other by a resistor outside the battery container, the pull-up is performed inside the battery container. For example, the resistor is detached and the battery container cannot be kept at the positive electrode potential. Furthermore, although the operation of connecting the resistor after the battery container is sealed is complicated, the installation of the protective plate 12b is one-touch, and an effect that the operation can be performed extremely easily can be achieved.

Heretofore, the batteries according to the first to third embodiments of the present invention have been described. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention. It is not limited to a specific battery type (electrode material, laminated type, wound type) or a specific battery container shape (square, cylindrical type), but is scattered when the battery container and lid are sealed. Can be applied to any battery that may reach the stack. Each of the above dimensions can be changed as appropriate without departing from the spirit of the present invention.
In addition, although the metal frame of the protective plates 12, 12a, and 12b was demonstrated as a structure which processed the metal plate suitably, you may comprise by vapor deposition. Moreover, although the 1st and 2nd deformation | transformation part is provided in the protection plates 12a and 12b, it is good also as a structure which provides only one of a 1st deformation part or a 2nd deformation part. Furthermore, although the thickness of these 1st and 2nd deformation | transformation parts was set to (L7) / 2, it is good also as thickness different from a metal frame main-body part. In addition, when a safety valve is formed on the lid 3, a through-hole for venting gas (however, a substance that substantially prevents the scattered matter from reaching the laminated body at the center of the protective plates 12, 12a, 12b). A small-diameter hole) may be formed.
In the above description, the terminal portion and the rivet portion are formed in the electrode terminal 8 for rivet driving. However, when the protection plate 12 and the electrode lead 7 are fixed to the electrode terminal 8 by screws instead of rivets, for example, the electrode terminal 8 has a substantially circular cross section having a diameter L1 without forming a rivet portion. A cylindrical shape and a screw hole at one end thereof, and a screw body portion of a male screw that is screwed into the screw hole may have a diameter L2. Even in such a configuration, the above-described effects can be achieved.
Further, the battery container may be a plastic container or the like instead of a metal container. In this case, the container body and the lid are thermally welded or bonded to perform sealing, but the protective plates 12, 12a, and 12b prevent the scattered matter from reaching the laminate from between the container body and the lid. Therefore, deterioration of battery performance can be prevented and a battery with excellent performance can be provided.

DESCRIPTION OF SYMBOLS 1 Battery 2 Container body 3 Lid 4 Electrode plate 5 Electrode tab 6 Separator 7 Electrode lead 8 Electrode terminal 9 Insulator 10 Electrode unit 11 Electrode body 12 Protection plate 13 Washer (washer)
14 Insulating plate 15 Metal frame 16 Through hole 17 Bending part

Claims (6)

A laminate in which a first electrode plate and a second electrode plate are laminated via a separator;
A container main body comprising an opening, and containing the laminate from the opening;
An electrode terminal electrically connected to the first electrode plate or the second electrode plate, and a lid for sealing the container body with a sealing part;
An insulating plate having substantially the same shape as the opening, and a protective plate housed in the container body;
Have
The battery, wherein the protective plate is accommodated on the side of the laminated body with respect to the sealing portion and substantially covers the opening.   2. The battery according to claim 1, wherein the protection plate further includes a metal frame that covers at least the periphery of one surface of the insulating plate, and the one surface is disposed toward the lid. The metal frame includes a metal frame main body part fitted in the insulating plate, and a deformation part joined to the metal frame main body part,
The battery according to claim 2, wherein the deformable portion contacts the container body with a spring property. The container body is made of metal,
The said metal frame main-body part is further equipped with the metal convex part extended on both surfaces of the said insulating board, and said 1st electrode plate is connected to the said electrode terminal via the said metal convex part. Battery.   The battery according to claim 4, wherein the first electrode plate is a positive electrode plate and the metal frame is formed of a high resistance metal. The laminate includes a first laminate in which a first electrode plate and a second electrode plate are laminated via a separator, and a second laminate in which the first electrode plate and the second electrode plate are laminated via a separator. The body,
A first electrode lead having one end connected to the first electrode plate of the first laminate and the other end connected to the electrode terminal;
A second electrode lead having one end connected to the first electrode plate of the second laminate and the other end connected to the electrode terminal;
Further comprising
The first and second electrode leads are bundled and folded in an S shape between the electrode terminal and the first and second laminated bodies. battery.

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