JP2002334685A - Battery lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery lid in which a protection device can be housed and which is capable of constituting a battery of small size and good assembly performance. SOLUTION: The battery lid comprises a metallic plate member 2a that shields the inside 1a of a battery cell 1 used for a secondary battery and the plate member 2a can be fitted with a protection device 4 for explosion-protection or fire-protection, and the plate member 2a is formed with a first recess 2e for housing the protection device 4. Thereby, this battery lid contributes to small-sizing and thinning of the battery.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for a rechargeable lithium-ion secondary battery or the like, which is used as a power source for mobile devices such as a video camera, a notebook computer, and a mobile phone, and a battery cover for sealing a battery cell. About.

[0002]

2. Description of the Related Art Referring to the drawings of a conventional battery cover, FIG. 11 is a front view of a battery to which the conventional battery cover is attached.

As shown in FIG. 11, a conventional battery lid is as follows.
It is used to seal the battery cell 51 of the battery B1 such as a secondary battery.

The battery cell 51 is formed of an aluminum casing and has a rectangular bottom wall 51a and a side wall 51b extending upward from the bottom wall 51a. In an interior 51c surrounded by the portion 51a and the side wall portion 51b, an electrode group (not shown) including a positive electrode plate, a negative electrode plate, a separator provided between the positive electrode plate and the negative electrode plate, and a lithium salt are provided. It is made of a material dissolved in an organic solvent, is immersed in an electrode group, and is injected with an electrolytic solution using the electrode group as a power generation element.

[0005] The battery lid 52 is made of an aluminum plate-like member 52.
a, and an electrode portion 52b protruding from the plate member 52a. The battery lid 52 is provided with an opening 51d of the battery cell 51.
, And is firmly fixed to the battery cell 51 by performing laser welding on the outer periphery, thereby sealing the inside 51c. The electrode portion 52 of the battery lid 52
b is connected to a negative electrode plate (not shown) and constitutes a negative electrode.

An Al-Ni clad material 53 made of an aluminum layer and a nickel layer is attached to the bottom wall portion 51a by welding or the like, and a lead wire 54 made of nickel is connected to the nickel layer and bent at a right angle. Side wall 51b
And extend in parallel.

The insulating sheet 55 has an elongated rectangular shape.
The lead wire 54 is attached to the side wall portion 51b by bonding or the like.
And the battery cell 51 are insulated. The protection device 56 is made of a PTC that suppresses the flow of current by increasing the resistance due to temperature. One terminal 56a is connected to the lead wire 54, and the other terminal 56b is connected to a lead wire 57 made of nickel. It is connected. The clad material 53 is connected to a positive electrode plate (not shown), and the lead wire 57 constitutes a positive electrode.

[0008]

The conventional battery cover is used for a lithium ion secondary battery in the manner described above. In the conventional secondary battery, a protection device 56 made of PTC is used for the battery cell 51. Since the battery B1 is attached to the side wall portion 51b, the size of the battery B1 becomes large, and there is a problem that it is not possible to cope with a reduction in size and thickness required for a battery used in recent mobile devices. Also, an insulating sheet 55 is attached, and the lead wire 5
Since the protection device 56 is connected at the positions 4 and 57, the number of assembled parts is increased, the assemblability is deteriorated, and the mass productivity is poor.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a small size, in which a protection device can be housed in a battery cover.
It is another object of the present invention to provide a battery cover that can form a battery with good assemblability.

[0010]

Means for Solving the Problems As a first means for solving the above problems, a battery cover of the present invention is a metal cover for sealing a battery cell of a secondary battery and shielding the inside of the battery cell. A plate-like member is provided, and a protection device for explosion-proof or fire protection can be attached to the plate-like member, and the plate-like member has a first concave portion for accommodating the protection device. The configuration was adopted.

As a second solving means, the depth of the first concave portion of the battery lid body of the present invention is a part of the protection device, and is provided with a protection means for interrupting an electric circuit. The thickness is substantially equal to or larger than the thickness of the main body.

As a third solution, the plate-shaped member of the battery cover of the present invention can be opposed to a first terminal extending from the main body of the protection device. A first insulating portion can be arranged between the portion and the plate-shaped member, and a second recess for accommodating the first insulating portion is formed in the plate-shaped member. The configuration was adopted.

As a fourth solution, the depth of the second concave portion of the battery cover of the present invention is substantially equal to or larger than the thickness of the first insulating portion.

According to a fifth aspect of the present invention, in the battery cover of the present invention, the protection device is configured such that:
A connection terminal extending in a direction opposite to the terminal portion of the first member, and the plate-shaped member is provided with a storage recess for storing the connection terminal while communicating with the first recess. The configuration is such that metal terminals that can be connected by stacking connection terminals are attached.

As a sixth solution, the depth of the storage recess of the battery lid of the present invention is substantially equal to or larger than the thickness of the connection terminal and the metal terminal as a whole.

As a seventh solution, the plate-like member of the battery lid of the present invention contains an insulator for insulating an electrode portion through which the plate-like member can be inserted from the plate-like member. In which a concave portion is formed.

As an eighth solution, the depth of the concave portion of the battery lid of the present invention is substantially equal to or larger than the thickness of the insulator.

According to a ninth solution means, the plate-shaped member of the battery cover of the present invention comprises a second terminal portion extending from the main body portion of the protection device in a direction opposite to the first terminal portion. The second insulating member can be disposed between the second terminal portion and the plate-shaped member, and the second insulating portion is housed in the plate-shaped member. The third concave portion is formed.

As a tenth solution, the depth of the third recess of the battery lid of the present invention is substantially equal to or larger than the thickness of the second insulating portion.

As an eleventh solution, a plurality of projections are formed on the plate-shaped member of the battery lid of the present invention so as to protrude toward the side where the protection device is stored. The protection device is configured to be able to protrude beyond the main body.

[0021] As a twelfth solution, the plurality of projections of the battery lid of the present invention are formed along the outer periphery of the plate-like member.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings of the battery cover of the present invention, FIG. 1 is a front view of a battery to which the battery cover of the present invention is attached, and FIG. 2 is a first view of the battery cover of the present invention. FIG. 3 is an exploded perspective view of a battery cover unit according to the first embodiment of the present invention, and FIG. 4 is an exploded perspective view of the battery cover unit according to the first embodiment of the present invention. FIG. 5 is a side view of a protection device attached to the battery cover according to the first embodiment of the present invention. FIG. 5 is a main part of the battery cover according to the first embodiment of the present invention in a state where terminals of the protection device are attached. It is sectional drawing.

As shown in FIG. 1, the battery cover of the present invention
It is used as a part of a battery cover unit U equipped with a protection device and the like, which is used for sealing a battery cell 1 of an organic battery B such as a lithium ion secondary battery. The configuration of the battery B and the battery cover unit U in which the first embodiment of the body is used will be described.

The battery cell 1 is made of an aluminum casing and has a rectangular bottom wall 1a and a side wall 1b extending upward from the bottom wall 1a. Although not shown, a positive electrode plate, a negative electrode plate, an electrode group composed of a separator provided between the positive electrode plate and the negative electrode plate, and a lithium salt are provided in an interior 1c surrounded by the portion 1a and the side wall portion 1b. It is made of a material dissolved in an organic solvent, is immersed in an electrode group, and is injected with an electrolytic solution using the electrode group as a power generation element.

The battery lid 2 is made of an aluminum plate-like member 2a.
And a storage part 2b formed from the center to one end.
A safety valve 2c formed at the opposite end and formed by forming a metal thin film at the lower end of a through hole that passes vertically, and a first through hole 2d formed at the center. Having. The storage portion 2b includes a first concave portion 2e formed near the end portion, a second concave portion 2f further formed on the end side from the first concave portion 2e via a step, and a plate-like member 2a. And a concave portion 2g communicating with the first through hole 2d.

The insulating member 3 is made of PP (polypropylene),
A main body portion 3a formed of a synthetic resin molded product such as PPS (polyphenylene sulfide) and having an elongated rectangular shape and a rectangular rectangular hole 3b formed inside, and a lower portion from one end of the main body portion 3a. A first insulating portion 3c formed in a reverse convex shape, and an insulator 3d formed on the other end side and below the main body portion 3a and having a through hole 3e in the center. The first insulating portion 3c includes a guide portion 3f formed one step lower than the ends of the two frames in the longitudinal direction of the main body portion 3a, and a projection 3g projecting upward from the central portion of the guide portion 3f. Having.

The insulating member 3 is accommodated in the accommodating portion 2b of the plate member 2a, the first insulating portion 3c is accommodated in the second concave portion 2f, and the insulator 3d is accommodated in the concave portion 2g.
The positioning of the insulating member 3 is ensured. At this time, the first through hole 2d of the plate member 2a and the through hole 3e of the insulator 3d are in communication with each other, and the depth of the second recess 2f is the thickness of the first insulating portion 3c. Than, roughly equivalent,
Or, since it is designed to be large, the first insulating portion 3c
Does not travel from the second concave portion 2f, and the thickness of the battery cover unit U can be reduced. Furthermore, since the depth of the concave portion 2g is designed to be substantially equal to or larger than the thickness of the insulator 3d, the insulator 3d does not travel from the concave portion 2g, and the battery cover unit U The thickness can be reduced.

The thermal switch 4, which is a protection device, is connected to a rectangular main body 4a made of a synthetic resin molded article having a shut-off means (not shown) having a switch section made of bimetal, and the shut-off means. First and second connection terminals 4b and 4c protruding from both sides of the main body, and first and second terminal pieces that are welded at ends of the first and second connection terminals 4b and 4c and extend in opposite directions. 4d and 4e. The first terminal piece 4d includes a base 4g having a through hole 4f formed therein,
And a bent piece 4h formed by being bent vertically from an end of the base 4g.

The first connection terminal 4b is made of nickel, and the first terminal piece 4d is made of nickel. The first connection terminal 4b and the first terminal piece 4d are The first terminal portion T1 is formed by welding such as ultrasonic welding or resistance welding. Note that the first connection terminal 4b and the first terminal piece 4d may be made of phosphor bronze. Further, a configuration in which nickel and phosphor bronze are combined and welded to each other may be used.

The second connection terminal 4c is made of nickel, and the second terminal portion 4e is made of an aluminum layer 4k and an Al-Ni clad material C having a nickel layer 4m. Is formed with a projection 4n (projection) for welding projecting downward. The second connection terminal 4c and the second terminal piece 4e are welded by ultrasonic welding, resistance welding, or the like to form a second terminal portion T2. The second connection terminal 4c may be made of phosphor bronze, and a phosphor bronze layer may be provided instead of the nickel layer 4m. Further, a combination of welding nickel and phosphor bronze may be used. Further, a brass layer or an iron layer may be provided instead of the nickel layer 4m. Further, the clad material C is not necessarily required to have two layers. When the temperature of the heat-sensitive switch 4 reaches a reference temperature, a switch unit serving as a cutoff unit is switched to an OFF state. There is a characteristic that the reference temperature is hardly changed even when the switching of the switch unit is repeatedly performed.

The thermal switch 4 having such a configuration is
It is inserted through the through hole of the insulating member 3 and housed in the first recess 2e. At this time, the thermal switch 4 is fixed to the insulating member 3 by inserting the through hole 4f of the first terminal piece 4d into the projection 3g of the first insulating portion 3c and caulking. Further, the base 4g of the first terminal 4d is guided by the guide 3f, so that the thermal switch 4 is securely fixed. Also,
Since the end of the bent piece 4h where the bending line X is located is located on the first insulating portion 3c, the insulation between the battery lid 2 and the first terminal portion T1 is reliably achieved.

The aluminum layer 4k of the second terminal piece 4e
Is opposed to the battery lid 2, and the second terminal strip 4 e and the battery lid 2 are welded by resistance welding to be electrically connected. Further, since the protruding portion 4n is formed on the aluminum layer 4k, electric power is concentrated during resistance welding, the protruding portion 4n is melted, and the second terminal piece 4e and the battery lid 2 are efficiently welded. Is performed. Needless to say, welding may be performed using ultrasonic welding or the like.

The waterproof sheet 5 is made of a thin sheet such as PP (polypropylene), PE (polyethylene), etc., has a cut 5a near the edge, and has an adhesive applied to the lower surface. Such a waterproof sheet 5 is adhered so as to cover the main body 4a of the thermal switch 4 in a state where the bent piece 4h is inserted through the cutout 5a.
Protect from water drops.

The gasket 6 is made of a synthetic resin such as PP (polypropylene) or PPS (polyphenylene sulfide). The gasket 6 has a thin plate-like base 6a and a cylindrical tube protruding upward from the center of the base 6a. 6b from below the battery lid 2 with the first through-hole 2
d, the base 6a and the lower surface of the battery lid 2 are brought into close contact with each other through the through hole 3e.

The electrode portion and the rivet 7 as a holding means are
A cylindrical portion 6 of a gasket 6 having a base 7a and a projection 7b
The protrusion 7b is inserted into the portion b. Also, the protrusion 7b
Is made of a thin plate having a through hole 8a, is also inserted into the through hole 8a of the metal plate 8 placed on the insulator 3d, the tip is caulked, and the insulating member 3 is fixed to the battery lid 2. ing.

In the first embodiment of the battery cover according to the present invention, as described above, the battery B is mounted on the battery cell 1 and the battery cover 2 made of aluminum is negatively charged. The first terminal piece 4d forms a negative electrode via the second terminal piece 4e welded to the lid 2 and the thermal switch 4, and the rivet 7 is connected to a positive electrode plate (not shown). It functions as an electrode part of a positive electrode, and an area is gained by the metal plate 8.

Next, a method of manufacturing the battery B using the first embodiment of the battery cover of the present invention will be described. First, the insulating member 3 is positioned on the battery cover 2 by the storage portion 2b. The thermal switch 4 is inserted in the rectangular hole 3b while being stored in the first concave portion 2e, and the waterproof sheet 5 is attached so as to cover the upper surface thereof. In a state where the gasket 6, the battery cover 2, and the insulating member 3 are sandwiched, the rivet 7 is caulked to the metal plate 8, and each member is fixed to form the battery cover unit U. Further, a casing of the battery cell 1 in which the electrode plate and the like are disposed in the inside 1c is formed, and the casing of the battery cell 1 and the battery lid unit U are dried. The reason for drying in this way is that lithium easily reacts with water. Then, the battery lid unit U is welded to the housing of the battery cell 1 by laser welding, the inside 1c is sealed, an electrolytic solution is injected from an injection port 1d formed in the side wall 1b, and the injection port 1d is sealed. . Thereafter, the electrolyte scattered at the time of injection is washed with water and dried, and the battery B is manufactured.

As described above, in the process of manufacturing the battery B, the battery cover 2 is exposed to the surrounding environment in which the electrolytic solution is scattered and the water at the time of washing is scattered. Since they are securely fixed, these parts do not shift due to water pressure or the like. Further, since the waterproof sheet 5 is attached so as to cover the thermal switch 4, there is no possibility that the thermal switch 4 gets wet. In addition, if each component is incorporated in the battery cover 2, the battery cover unit U can be manufactured.
Very simple.

Referring now to the drawings of a second embodiment of the battery cover of the present invention, FIG. 6 shows an exploded view of a battery cover unit in which the second embodiment of the battery cover of the present invention is used. FIG. 7 is an exploded perspective view of a main part showing a modified example of the insulating part of the battery lid unit in which the second embodiment of the battery lid of the present invention is used.

The second embodiment of the battery cover of the present invention is as follows.
Unlike the first embodiment, the first embodiment is different from the first embodiment in that the storage portion is not formed. The first concave portion 2e and the second concave portion 2f are adjacent to each other, and the concave portion 2g is independently located at the center of the plate member 2a. Is formed. Other components are the same as those of the first embodiment, and the same members are denoted by the same reference numerals and description thereof will be omitted. Next, the battery cover unit U1 in which the second embodiment of the battery cover of the present invention is used will be described. The insulation of the battery cover unit U in which the first embodiment of the battery cover of the present invention is used is described. Instead of the member 3, an insulating sheet 9 as a first insulating portion and an insulator 10 are provided separately. The insulating sheet 9 as a first insulating portion is made of PP (polypropylene),
It is composed of an insulating sheet made of a synthetic resin such as PPS (polyphenylene sulfide), and is housed and adhered in the second recess 2f.

The insulator 10 is made of PP (polypropylene),
Through-hole 1 formed in the center of a thin molded product of synthetic resin such as PPS (polyphenylene sulfide)
0a, and the insulator 10 is housed in the concave portion 2g. The other configuration is the same as the configuration of the battery cover unit U in which the first embodiment of the battery cover of the present invention is used. As a modification of the insulating sheet 9, as shown in FIG.
The insulating guide 11 having the guide portion 11a may be used as the first insulating portion. The base portion 4g of the first terminal piece 4d of the thermal switch 4 is guided by the guide portion 11a,
Positioned. Alternatively, a protrusion may be provided from the guide portion 11a, and the base 4g may be crimped.

Although not shown, a storage recess is formed in the first recess 2e on the side facing the second recess 2f so as to communicate with the first recess 2e. A metal terminal made of an Al-Ni clad material is welded to the second terminal piece 4 so as to be laminated on the metal terminal.
The second connection terminal 4c from which e has been removed may be welded to house the second connection terminal 4c. At this time,
If the depth of the storage recess is substantially equal to or larger than the thickness of the second connection terminal 4c and the entire metal terminal, the thickness can be reduced. In addition, the metal terminal does not necessarily need to be a clad material, and may be formed of a normal metal plate depending on the material of the plate-like member 2a. Other features are the same as those of the battery cover unit U in which the first embodiment of the battery cover of the present invention is used.

Next, a drawing of a third embodiment of the battery cover of the present invention will be described. FIG. 8 shows a main part of a battery cover unit using the third embodiment of the battery cover of the present invention. FIG. 9 is an exploded perspective view of a battery cover unit in which the third embodiment of the battery cover according to the present invention is used.

A third embodiment of the battery cover of the present invention is as follows.
Although the shape is almost the same as in the first embodiment, a third concave portion 2h is provided instead of the concave portion 2g. Other components are the same as those of the first embodiment, and the same members are denoted by the same reference numerals and description thereof will be omitted. Next, a battery cover unit U2 in which the third embodiment of the battery cover of the present invention is used will be described.
Is a frame-shaped main body portion 12a formed of a molded product of a synthetic resin such as PP (polypropylene), PPS (polyphenylene sulfide) or the like, having an elongated rectangular shape and forming a rectangular rectangular hole 12b inside, and a main body 12a. A first insulating portion 12c formed in a reverse convex shape downward from one end of the portion 12a;
A second insulator (12d) having an extension (12h) formed at the center and extending to the other end;
And a third through hole 12e formed at the center of 2d. The first insulating portion 12c includes a guide portion 12f formed one step below the ends of the two frames in the longitudinal direction of the main body portion 12a, and a protrusion 12g projecting upward from a central portion of the guide portion 12f. Having. That is, the insulating member 12 has an extended portion 12h instead of the insulator 3d of the insulating member 3 used in the battery cover unit U in which the first embodiment of the battery cover of the present invention is used. Two insulating portions 12d are formed, and a third through-hole 12e is formed in the second insulating portion 12d.

The insulating member 12 is connected to the battery lid 2.
The storage member 2b of the plate-like member 2a
Is reliably positioned. At this time, the battery cover unit U in which the first embodiment of the battery cover of the present invention is used.
Similarly to the first embodiment, the depth of the second concave portion 2f is the same as that of the first insulating portion 1.
Since the thickness is designed to be substantially equal to or larger than the thickness of 2c, the first insulating portion 12c does not travel from the second concave portion 2f, and the thickness of the battery cover unit U2 can be reduced. Further, the depth of the third recess 2h is designed to be substantially equal to or larger than the thickness of the second insulating portion 12d, so that the second insulating portion 12d can travel from the third recess 2h. And the thickness of the battery lid unit U2 can be reduced.

The second terminal piece 4e of the second terminal portion T2 of the thermal switch 4, which is a protection device, extends in the end direction, and has a second through hole 4p formed near the end. The second terminal piece 4e of the present embodiment is not made of a clad material, but is made of only a nickel material. In addition, you may comprise from aluminum, phosphor bronze, iron, etc. Other parts of the thermal switch 4 are the same as those of the thermal switch 4 used in the battery lid unit U in which the first embodiment of the battery lid of the present invention is used. The heat-sensitive switch 4 is securely fixed by inserting the protrusion 12g of the insulating member 12 housed in the second member 2 and caulking it, and housing the main body 4a in the first recess 2e through the rectangular hole 12b. When the thermal switch 4 is fixed in this manner, the first, second, and third through holes 2d, 4p, and 12e are in a state of communicating with each other.

The first, second and third through holes 2d, 4p and 12e communicating with each other are provided with a rivet 13 as a holding means via a gasket 6, and are riveted by the second terminal piece 4e. 13 is caulked. Then, the rivet 13 and the second terminal piece 4e are electrically connected, and the first terminal piece 4d forms an electrode. The material of the rivet 13 is made of iron (plated with nickel). In addition, you may comprise with aluminum, nickel, etc. Other features are the same as those of the battery cover unit U in which the first embodiment of the battery cover of the present invention is used. The material of the battery lid 2 is made of an aluminum material, but is not necessarily made of an aluminum material, and may be another metal such as nickel or iron (plated with nickel). That is, in the battery cover unit U2 in which the third embodiment of the battery cover of the present invention is used, since the electrodes are taken out from the battery cells 1 and the battery cover 2 itself, the first terminal The piece 4d and the electrode may be designed so that the electrode of the battery cell 1 and the electrode of the battery lid 2 are different. Incidentally, in the present embodiment, the first terminal piece 4d made of a nickel material constitutes a positive electrode, and the battery cell 1 and battery lid 2 made of an aluminum material constitute a negative electrode.

Although the battery cover of the present invention has the above-described structure and is used as described above, it is needless to say that the present invention is not limited to the above description. As shown in FIG. 10 which is a perspective view showing a modification, a projection 2k projecting upward from the plate member 2a may be formed along the outer peripheral portion. The convex portion 2k projects beyond the thermal switch 4, and when the battery B falls, an impact force is first applied to the convex portion 2k, so that the thermal switch 4 is protected.

The protection device for the battery cover units U, U1, and U2 in which the battery cover of the present invention is used has been described with the thermal switch 4 in the above description, but a PTC, a thermal fuse, or the like may be used. Further, in the above description, the form in which the waterproof sheet 5 is used in order to prevent the protection devices from being wetted with water has been described. However, waterproofing may be achieved by applying a sealant made of a viscous synthetic resin. . In the above description, an example in which the present invention is used for a lithium ion secondary battery has been described. However, it is needless to say that the present invention can be used for any secondary battery.

[0050]

The battery cover of the present invention includes a metal plate-like member for sealing the battery cell of the secondary battery and shielding the inside of the battery cell. The plate-like member is used for explosion-proof or fire-proof. Can be attached, and the plate-shaped member is formed with a first recess for accommodating the protection device.
Since the protection device can be accommodated in the battery lid and there is no need to attach the protection device to the side wall or the like, it is possible to provide a battery lid that contributes to miniaturization and thinning of the battery. In addition, since the protection device may be housed in the battery lid, a battery lid having good assemblability and contributing to mass productivity can be provided.

The depth dimension of the first concave portion of the battery lid of the present invention is substantially equal to the thickness dimension of the main body part which is a part of the protection device and has a protection means for cutting off the electric circuit. Alternatively, since the main body of the protection device does not travel in the thickness direction due to the large configuration, a battery lid that contributes to miniaturization and thinning of the battery can be provided.

Further, the plate-shaped member of the battery lid of the present invention can be opposed to the first terminal portion extending from the main body portion.
The first insulating portion can be disposed between the terminal portion and the plate-shaped member, and the second concave portion is formed in the plate-shaped member. Since the insulating portion can be accommodated, it is possible to provide a battery lid that contributes to miniaturization and thinning of the battery.

Further, the depth dimension of the second concave portion of the battery cover of the present invention is substantially equal to or larger than the thickness dimension of the first insulating portion, so that the first insulating portion travels in the thickness direction. Therefore, it is possible to provide a battery cover that contributes to miniaturization and thinning of the battery.

Further, the protection device of the battery cover of the present invention has a connection terminal, and the plate-shaped member is provided with an accommodation recess for accommodating the second terminal portion while communicating with the first recess. However, since the connection recess is provided with a metal terminal that can be connected and stacked in the storage recess,
Since the connection terminal and the metal terminal can be accommodated, a battery lid body that contributes to downsizing and thinning of the battery can be provided.

Further, the depth dimension of the storage recess of the battery cover of the present invention is substantially equal to or larger than the thickness dimension of the entire connection terminal and metal terminal, so that the connection terminal and metal terminal travel in the thickness direction. Therefore, it is possible to provide a battery cover that contributes to miniaturization and thinning of the battery.

The plate member of the battery lid of the present invention includes:
Since the concave portion for accommodating the insulator that insulates the electrode portion through which the plate-shaped member can be insulated from the plate-shaped member is formed, the insulator can be accommodated in the battery lid.
It is possible to provide a battery cover that contributes to downsizing and thinning of the battery.

Further, the depth of the concave portion of the battery cover of the present invention is substantially equal to or larger than the thickness of the insulator, so that the insulator does not travel in the thickness direction. A battery lid that contributes to size reduction and thickness reduction can be provided.

Further, the plate-shaped member of the battery lid of the present invention is not capable of facing the second terminal portion extending from the main body portion.
A second insulating portion can be arranged between the terminal portion and the plate-shaped member, and a third concave portion for accommodating the second insulating portion is formed in the plate-shaped member. Therefore, the second insulating portion can be stored in the battery lid, so that the battery can be downsized,
A battery lid that contributes to thinning can be provided.

Further, the depth dimension of the third concave portion of the battery lid of the present invention is substantially equal to or larger than the thickness dimension of the second insulating section, so that the second insulating section travels in the thickness direction. Therefore, it is possible to provide a battery cover that contributes to miniaturization and thinning of the battery.

[Brief description of the drawings]

FIG. 1 is a front view of a battery to which a battery lid of the present invention is attached.

FIG. 2 is a sectional view of a main part of a battery cover unit in which the first embodiment of the battery cover according to the present invention is used.

FIG. 3 is an exploded perspective view of a battery cover unit in which the battery cover according to the first embodiment of the present invention is used.

FIG. 4 is a side view of the protection device attached to the battery cover according to the first embodiment of the present invention.

FIG. 5 is an essential part cross-sectional view showing a state in which a terminal portion of the protection device according to the first embodiment of the battery cover of the present invention is attached.

FIG. 6 is an exploded perspective view of a battery cover unit in which the battery cover according to the second embodiment of the present invention is used.

FIG. 7 is an exploded perspective view of a main part showing a modified example of an insulating portion of a battery lid unit in which the second embodiment of the battery lid of the present invention is used.

FIG. 8 is a sectional view of a main part of a battery cover unit in which a third embodiment of the battery cover according to the present invention is used.

FIG. 9 is an exploded perspective view of a battery cover unit in which the battery cover according to the third embodiment of the present invention is used.

FIG. 10 is a perspective view showing a modification of the battery lid of the present invention.

FIG. 11 is a front view of a battery with a conventional battery lid attached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery cell 1a Bottom wall part 1b Side wall part 1c Inside 1d Inlet 2 Battery lid 2a Plate member 2b Storage part 2c Safety valve 2d First through hole 2e First concave part 2f Second concave part 2g Concave part 2h Third 3 Insulating member 3a Main body 3b Rectangular hole 3c First insulating part 3d Insulator 3e Through hole 3f Guide 3g Projection 4 Thermal switch (protection device) 4a Main body 4b First connection terminal 4c Second connection terminal 4d first terminal piece 4e second terminal piece 4f through hole 4g base 4h bent piece 4k aluminum layer 4m nickel layer 4n protrusion 4p second through hole 5 waterproof sheet 5a cutout 6 gasket 7 rivet (electrode part) 7a Base 7b Projection 8 Metal Plate 9 Insulation Sheet 10 Insulator 10a Through Hole 11 Insulation Guide 11a Guide 12 Insulation Member 12a Main Body 2b rectangular hole 12c first insulating portion 12d second insulating portion 12e third through hole 12f guide portion 12g protrusion 12h extension portion 13 rivet (holding means) B battery C clad material U battery cover unit U1 battery cover unit U2 Battery cover unit T1 First terminal part T2 Second terminal part

Claims (12)

[Claims] 1. A metal plate-like member for hermetically closing a battery cell of a secondary battery and shielding the inside of the battery cell, wherein a protection device for explosion-proof or fire-proof can be attached to the plate-like member. A battery lid body, wherein a first concave portion for accommodating the protection device is formed in the plate member. 2. A depth dimension of the first recess is substantially equal to or larger than a thickness dimension of a main body part which is a part of the protection device and has a protection means for interrupting an electric circuit. The battery cover according to claim 1. 3. The device according to claim 1, wherein the plate-shaped member is capable of facing a first terminal portion extending from the main body of the protection device.
A first insulating portion can be arranged between the terminal portion and the plate-shaped member, and a second concave portion for accommodating the first insulating portion is formed in the plate-shaped member. The battery cover according to claim 1 or 2, wherein 4. A depth dimension of the second concave portion is equal to the first concave portion.
4. The battery lid according to claim 3, wherein the thickness is substantially equal to or larger than the thickness of the insulating portion. 5. The protection device according to claim 1, wherein
A connection terminal extending in a direction opposite to the terminal portion of the first member, and the plate-shaped member is provided with a storage recess for storing the connection terminal while communicating with the first recess. 5. A metal terminal on which connection terminals are stacked and which can be connected is attached.
4. The battery lid according to 1. 6. The battery lid according to claim 5, wherein a depth dimension of the storage recess is substantially equal to or larger than a thickness dimension of the entire connection terminal and the metal terminal. 7. The plate-shaped member is provided with a concave portion for accommodating an insulator that insulates the electrode portion through which the plate-shaped member can be inserted from the plate-shaped member. The battery lid according to claim 1. 8. The battery lid according to claim 7, wherein a depth dimension of the concave portion is substantially equal to or larger than a thickness dimension of the insulator. 9. The plate-shaped member is capable of facing a second terminal portion extending in a direction opposite to the first terminal portion from the main body portion of the protection device, and the second terminal portion and the plate can be opposed to each other. A second insulating portion can be disposed between the second insulating portion and the plate-shaped member, and a third concave portion for accommodating the second insulating portion is formed in the plate-shaped member. The battery cover according to claim 3 or 4, wherein 10. The battery lid according to claim 9, wherein a depth dimension of the third recess is substantially equal to or larger than a thickness dimension of the second insulating portion. 11. The plate-like member is formed with a plurality of protrusions protruding toward a side where the protection device is stored, and the protrusions can protrude beyond the main body of the protection device. The battery cover according to any one of claims 1 to 10, wherein 12. The device according to claim 11, wherein the plurality of protrusions are formed along an outer peripheral portion of the plate member.
4. The battery lid according to 1.