JP2003317703A - Battery and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery capable of reducing production processes. <P>SOLUTION: The battery 10 of the present invention comprises a battery case 1 accommodating a generator element 3, a lid 5 for sealing an opening of the battery case 1, and a liquid inlet 5a for injecting an electrolytic solution. The liquid inlet 5a is sealed with a positive electrode terminal 2, that is, the positive electrode terminal 2 acts as a seal for the liquid inlet 5a. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a battery and a method for manufacturing the battery.

[0002]

2. Description of the Related Art In recent years, since it is lightweight and has high potential, high capacity, high performance, and long life, various portable devices such as mobile phones, notebook personal computers, and electric vehicles such as electric vehicles. Non-aqueous electrolyte secondary batteries, such as lithium ion secondary batteries, are widely used as a power source for electric bicycles and the like.

A conventional prismatic lithium ion secondary battery will be described. FIG. 14 is a sectional view showing an example of a conventional battery. As shown in FIG. 14, the battery 10 includes a battery container 1, a power generating element 3, an insulator 4, a lid 5, a negative electrode terminal 7, a gasket 8, a positive electrode terminal 2, and a sealing material 6.

The battery container 1 has a box shape, and has an opening at the top in the drawing. The battery case 1 is made of aluminum or aluminum alloy. This is to reduce the weight of the battery 10.

A power generating element 3 is housed in the battery container 1. The power generation element 3 is formed by laminating a positive electrode 3a, a separator 3b, a negative electrode 3c, and a separator 3b and rolling them. The positive electrode 3a is a strip-shaped current collector on which a layer containing a positive electrode active material is formed. The separator 3b is made of a microporous plastic film. The negative electrode 3c is a strip-shaped current collector having a layer containing a negative electrode active material formed thereon.

A negative electrode lead 3d and a positive electrode lead 3e are projected from the power generation element 3. The negative electrode lead 3d extends from the vicinity of the central portion of the power generation element 3. One end (not shown) of the negative electrode lead 3d is connected to the current collector of the negative electrode 3c. The positive electrode lead 3e extends from the vicinity of the outer edge of the power generation element 3. One end (not shown) of the positive electrode lead 3e is connected to the current collector of the positive electrode 3a, and the other end of the positive electrode lead 3e is welded to the inside of the battery container 1.

An insulator 4 is arranged on the power generating element 3. The insulator 4 is made of an insulating plastic film. The insulator 4 ensures the insulation between the positive electrode 3a and the negative electrode terminal 7, and the insulation between the negative electrode 3c and the battery container 1.

A lid 5 is arranged in the opening of the battery container 1. The lid 5 is a rectangular plate. The lid 5 is made of aluminum or aluminum alloy. Lid 5
The outer periphery of is in contact with the inside of the opening of the battery container 1 without any gap. The outer periphery of the lid 5 and the inside of the opening are fixed by welding.

A hole is provided in the central portion of the lid 5.
The negative electrode terminal 7 is arranged in this hole. The negative electrode terminal 7 is made of nickel-plated iron. A negative electrode lead 3d is welded inside the negative electrode terminal 7. Negative electrode lead 3
Due to the presence of d, the negative electrode terminal 7 and the negative electrode 3c of the power generation element 3 are electrically connected. An external lead body (not shown) is welded to the negative electrode terminal 7. The outer lead body is made of nickel or nickel-plated iron.

A gasket 8 is arranged between the central hole of the lid 5 and the negative electrode terminal 7. The gasket 8 is made of insulating plastic. The gasket 8 ensures the insulation between the negative electrode terminal 7 and the lid 5, and also secures the central hole of the lid 5.

On the left side of the upper surface of the lid body 5 in the drawing, the positive electrode terminal 2 is arranged. The positive electrode terminal 2 is a rectangular plate. The positive electrode terminal 2 is made of nickel or a nickel-aluminum clad material. The positive electrode terminal 2 is welded to the lid body 5. An external lead body (not shown) is welded to the positive electrode terminal 2. The outer lead body is made of nickel or nickel-plated iron.

A liquid injection port 5a is formed on the right side of the upper surface of the lid body 5 in the drawing. The liquid injection port 5a has a circular cross section. A sealing material 6 is placed on the liquid injection port 5a. The sealing material 6 is a disk. The diameter of the sealing material 6 is larger than the diameter of the liquid injection port 5a. The sealing material 6 is placed so as to completely cover the liquid injection port 5a. The outer edge of the sealing material 6 is welded to the lid 5 over the entire circumference.

A method of sealing the liquid injection port 5a with the sealing material 6 will be specifically described. FIG. 15 is a sectional view (1) showing a sealing portion of a conventional battery. The sealing material 6 has a disk shape, as shown in FIG. The sealing material 6 is aluminum,
Or made of aluminum alloy.

The injection port 5a is, as shown in FIG.
It is a hole that penetrates the lid 5. The liquid injection port 5a has a circular cross section. However, the cross section is not limited to a circle,
Other shapes can be adopted. The diameter of the liquid injection port 5a is in the range of 1 to 3 mm. The lid 5 is made of aluminum or aluminum alloy.

The sealing of the liquid injection port 5a with the sealing material 6 is shown in FIG.
It becomes like C. The sealing material 6 is placed on the liquid injection port 5a. The center of the liquid injection port 5a and the center of the sealing material 6 are aligned. The outer edge of the sealing material 6 and the lid 5 are laser-welded. The welded portion 6a is formed and the liquid injection port 5a is sealed.

FIG. 16 is a sectional view (2) showing a sealing portion of a conventional battery. As shown in A of FIG. 16, the sealing material 6 is
The convex portion 6b is formed on one surface of the disk. Sealing material 6
Is made of aluminum or an aluminum alloy.

The injection port 5a is, as shown in FIG. 16B,
It is a hole that penetrates the lid 5. The cross-sectional shape and diameter of the liquid injection port 5a and the material of the lid are the same as those in the above-mentioned example.

The sectional shape of the convex portion 6b is the same as the sectional shape of the liquid injection port 5a. The size of the cross-sectional shape of the convex portion 6b is slightly smaller than or slightly larger than the size of the cross-sectional shape of the liquid injection port 5a.

The sealing of the liquid injection port 5a with the sealing material 6 is shown in FIG.
It becomes like C. The convex portion 6 of the sealing material 6 is placed in the liquid injection port 5a.
Insert b. The size of the cross-sectional shape of the convex portion 6b depends on the liquid injection port 5
When it is slightly larger than the size of the cross-sectional shape of a, the convex portion 6b is pressed into the liquid injection port 5a. The outer edge of the sealing material 6 and the lid 5 are laser-welded. The welded portion 6a is formed and the liquid injection port 5a is sealed.

FIG. 17 is a sectional view (3) showing a sealing portion of a conventional battery. As shown in A of FIG. 16, the sealing material 6 is
The convex portion 6c is formed on one surface of the rectangular plate. The size of the cross-sectional shape of the convex portion 6c has two levels. The rectangular plate of the sealing material 6 is made of aluminum or an aluminum alloy. The convex portion 6c is made of resin or rubber. The rectangular plate and the convex portion 6c are bonded by an adhesive.

The injection port 5b is, as shown in FIG. 17B,
It is a hole that penetrates the lid 5. The diameter of the liquid injection port 5b has two stages. The material of the lid 5 is the same as the above-mentioned example.

The sectional shape of the convex portion 6c is the same as the sectional shape of the liquid injection port 5b. The size of the cross-sectional shape of the convex portion 6c is slightly smaller than the size of the cross-sectional shape of the liquid injection port 5b.

The sealing of the liquid injection port 5b with the sealing material 6 is shown in FIG.
It becomes like C. The convex portion 6 of the sealing material 6 is placed in the liquid injection port 5b.
Insert c. The two sides of the rectangle of the sealing material 6 and the lid 5 are laser-welded. The ring-shaped flat surface formed on the stepped portion of the convex portion 6c and the ring-shaped flat surface formed on the stepped portion of the liquid injection port 5b are in pressure contact with each other. The liquid injection port 5b is sealed by this pressure contact.

A method of welding the positive electrode terminal 2 to the lid 5 will be specifically described. The positive electrode terminal 2 is a rectangular plate, as shown in A of FIG. The positive electrode terminal 2 is made of nickel or a nickel-aluminum clad material. Lid 5
(B in FIG. 18) is made of aluminum or an aluminum alloy. The welding of the positive electrode terminal 2 and the lid 5 is as shown in C of FIG. The positive electrode terminal 2 is placed on the lid 5. Weld the spots near the four corners of the positive electrode terminal 2. As the welding, laser welding, ultrasonic welding, resistance welding, or the like can be adopted.

A method of manufacturing a conventional battery will be described. FIG. 19 shows an assembling procedure (1) of the conventional battery, and FIG. 20 shows an assembling procedure (2) of the conventional battery. As shown in A of FIG. 19, the power generation element 3 is housed in the battery container 1. As shown in B of FIG. 19, the negative electrode lead 3d is welded to the negative electrode terminal 7. The negative electrode lead 3d is connected to the power generation element 3. The negative electrode terminal 7 is attached to the lid body 5.
As shown in FIG. 19C, the opening of the battery container 1 is covered with the lid 5.
Seal with. The portion where the outer periphery of the lid 5 and the inside of the battery container 1 are in contact is welded. As shown in D of FIG. 19, the electrolytic solution is injected through the liquid injection port 5 a, and the electrolytic solution is impregnated in the power generation element 3.

As shown in FIG. 20E, the liquid injection port 5a is sealed with the sealing material 6. As the sealing material 6, any of the disk-shaped sealing material 6, the sealing material 6 having the convex portion 6b, and the sealing material 6 having the convex portion 6c made of resin or the like described in FIGS. can do. As shown in F of FIG. 20, the positive electrode terminal 2 is welded onto the lid 5. As shown in G of FIG. 20, by welding the external lead body 12 to the negative electrode terminal 7,
The external lead body 11 is welded to the positive electrode terminal 2.

FIG. 21 is a sectional view showing another example of a conventional battery. Differences between the conventional battery of this example and the above-described conventional battery (FIG. 14) will be described. In the above conventional battery (FIG. 14),
While the positive electrode terminal 2 was on the lid body 5, in the conventional battery (FIG. 21) of this example, the positive electrode terminal 2 is fixed to the bottom of the battery container 1. In the conventional battery described above, as shown in FIG. 18, the positive electrode terminal 2 is welded on the lid 5, whereas in the conventional battery of this example, the positive electrode terminal 2 is welded to the bottom of the battery container 1. Has been done. The welding method is the same as in FIG. 18, and laser welding, ultrasonic welding, resistance welding, or the like can be adopted. In the conventional battery described above, the positive electrode terminal 2 is welded on the lid body 5 as shown in F of FIG. 20, and the external lead body 11 is welded on the positive electrode terminal 2 as shown in G of FIG. On the other hand, in the conventional battery of this example, the positive electrode terminal 2 is welded to the bottom of the battery container 1, and the external lead body is welded onto the positive electrode terminal 2. In other respects, the above-described conventional battery (FIG. 14) and the conventional battery of this example (FIG. 21) are the same.

[0028]

In the conventional battery manufacturing method, the step of sealing the liquid injection port 5a with the sealing material 6, the step of welding the positive electrode terminal 2 to the lid 5 or the bottom of the battery container 1, Also, the process of welding the external lead body 11 to the positive electrode terminal 2 and many processes are required, which is complicated. Further, operations such as positioning the positive electrode terminal 2 with respect to the lid 5 or the bottom of the battery container 1 and positioning the external lead body 11 with respect to the positive electrode terminal 2 are also necessary.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a battery and a method of manufacturing the battery that can reduce the number of processing steps. Another object of the present invention is to provide a battery and a method of manufacturing the battery that can facilitate positioning of terminals.

It is another object of the present invention to provide a battery and a method of manufacturing the battery, which can reduce the number of processing steps. Another object of the present invention is to provide a battery and a method of manufacturing the same that can facilitate the positioning of the external lead body.

[0031]

A battery of the present invention includes a battery container for accommodating a power generating element, a lid for sealing an opening of the battery container, and an electrolytic solution provided on the battery container or the lid. In a battery including a liquid injection port for injecting liquid, the liquid injection port is sealed by a terminal. Thereby, the terminal can also serve to seal the liquid injection port.

Here, when the liquid injection port is provided in the lid, the terminal can also serve to seal the liquid injection port provided in the lid. Further, when the liquid injection port is provided on the bottom of the battery container, the terminal can also serve to seal the liquid injection port provided on the bottom of the battery container. Further, it is preferable that the terminal has a convex portion, and this convex portion is in the liquid injection port. By inserting the convex part into the injection port,
The movement of the terminal in the plane direction can be restricted.

The battery of the present invention has a battery container for accommodating the power generating element, a lid for sealing the opening of the battery container, and a pouring solution for pouring an electrolytic solution provided on the battery container or the lid. In the battery including the liquid port, the liquid injection port is sealed by the external lead body. As a result, the external lead body can serve not only to seal the liquid injection port but also to replace the terminal.

Here, when the liquid injection port is provided in the lid, the external lead body can also serve as a seal for the liquid injection port provided in the lid and as a substitute for the terminal. . Further, when the liquid injection port is provided on the bottom of the battery container, the external lead body can serve as a seal for the liquid injection port provided on the bottom of the battery container and also can serve as a substitute for the terminal. . Further, it is preferable that the external lead body has a convex portion, and the convex portion is inside the liquid injection port. By inserting the convex portion into the liquid injection port, the movement of the external lead body in the plane direction can be regulated.

The method for manufacturing a battery of the present invention comprises the steps of housing the power generating element in a battery container, sealing the opening of the battery container with a lid, and a liquid injection port provided in the battery container or the lid. It is a method having a step of injecting an electrolyte solution from the above and a step of sealing the injection port with terminals. Thereby, the terminal can also serve to seal the liquid injection port.

Here, in the case where the liquid injection port is provided in the lid, the terminal can be provided in the lid to also serve to seal the liquid injection port. Further, when the liquid injection port is provided at the bottom of the battery container, the terminal can be provided at the bottom of the battery container and can also serve to seal the liquid injection port. Further, it is preferable that the terminal has a convex portion, and this convex portion is in the liquid injection port. By inserting the convex part into the injection port,
The movement of the terminal in the plane direction can be restricted.

The manufacturing method of the present invention comprises the steps of accommodating the power generating element in a battery container, sealing the opening of the battery container with a lid, and electrolyzing from a liquid injection port provided in the battery container or the lid. It is a method including a step of injecting a liquid and a step of sealing an injection port with an external lead body. As a result, the external lead body can also serve as a seal for the liquid injection port and as a substitute for the terminal.

Here, when the liquid injection port is provided in the lid, the external lead body can also serve as a seal for the liquid injection port provided in the lid and as a substitute for the terminal. . Further, when the liquid injection port is provided at the bottom of the battery container, the external lead body can also serve as a seal for the liquid injection port provided at the bottom of the battery container and a role as a terminal. . Further, it is preferable that the external lead body has a convex portion, and the convex portion is inside the liquid injection port. By inserting the convex portion into the liquid injection port, the movement of the external lead body in the plane direction can be regulated.

[0039]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the invention relating to a battery and a method for manufacturing the battery will be described below. FIG. 1 is a sectional view showing an example of a prismatic lithium ion secondary battery of the present invention. As can be seen from FIG. 1, the battery 10 includes a battery container 1, a power generating element 3, an insulator 4, a lid 5, a negative electrode terminal 7, a gasket 8 and a positive electrode terminal 2.

The battery container 1 has a box shape, and has an opening at the top in the drawing. The battery case 1 is made of aluminum or aluminum alloy. This is to reduce the weight of the battery 10.

A power generating element 3 is housed in the battery container 1. The power generation element 3 is formed by laminating a positive electrode 3a, a separator 3b, a negative electrode 3c, and a separator 3b and rolling them. The positive electrode 3a is a strip-shaped current collector on which a layer containing a positive electrode active material is formed. The separator 3b is made of a microporous plastic film. The negative electrode 3c is a strip-shaped current collector having a layer containing a negative electrode active material formed thereon.

A negative electrode lead 3d and a positive electrode lead 3e are projected from the power generating element 3. The negative electrode lead 3d extends from the vicinity of the central portion of the power generation element 3. One end (not shown) of the negative electrode lead 3d is connected to the current collector of the negative electrode 3c. The positive electrode lead 3e extends from the vicinity of the outer edge of the power generation element 3. One end (not shown) of the positive electrode lead 3e is connected to the current collector of the positive electrode 3a, and the other end of the positive electrode lead 3e is welded to the inside of the battery container 1.

An insulator 4 is arranged on the power generating element 3. The insulator 4 is made of an insulating plastic film. The insulator 4 ensures the insulation between the positive electrode 3a and the negative electrode terminal 7, and the insulation between the negative electrode 3c and the battery container 1.

A lid 5 is arranged in the opening of the battery container 1. The lid 5 is a rectangular plate. The lid 5 is made of aluminum or aluminum alloy. Lid 5
The outer periphery of is in contact with the inside of the opening of the battery container 1 without any gap. The outer periphery of the lid 5 and the inside of the opening are fixed by welding.

A hole is provided in the central portion of the lid 5.
The negative electrode terminal 7 is arranged in this hole. The negative electrode terminal 7 is made of nickel-plated iron. A negative electrode lead 3d is welded inside the negative electrode terminal 7. Negative electrode lead 3
Due to the presence of d, the negative electrode terminal 7 and the negative electrode 3c of the power generation element 3 are electrically connected. An external lead wire (not shown) is welded to the negative electrode terminal 7. The outer lead body is made of nickel or nickel-plated iron.

A gasket 8 is arranged between the negative electrode terminal 7 and the central hole of the lid 5. The gasket 8 is made of insulating plastic. The gasket 8 ensures the insulation between the negative electrode terminal 7 and the lid 5, and also secures the central hole of the lid 5.

In the drawing, a liquid injection port 5a is formed on the left side of the upper surface of the lid body 5. The liquid injection port 5a has a circular cross section. The positive electrode terminal 2 is placed on the liquid injection port 5a.
The positive electrode terminal 2 is a rectangular plate. Positive electrode terminal 2 is injection port 5
It is placed so as to completely cover a. The positive electrode terminal 2 is
It is made of a nickel-aluminum clad material or the like. The positive electrode terminal 2 is welded to the lid body 5. An external lead body (not shown) is welded to the positive electrode terminal 2. The outer lead body is made of nickel or nickel-plated iron.

A method of sealing the liquid injection port 5a with the positive electrode terminal 2 will be specifically described. FIG. 2 is a sectional view (1) showing a sealing portion of the battery of the present invention. The positive electrode terminal 2 is a rectangular plate, as shown in FIG. The positive electrode terminal 2 includes a nickel-aluminum clad material, an iron-aluminum clad material,
Alternatively, it is made of stainless steel-aluminum clad material or the like.

The liquid injection port 5a is a hole penetrating the lid 5 as shown in FIG. 2B. The liquid injection port 5a has a circular cross section. However, the cross section is not limited to the circular shape, and other shapes such as a triangle, a quadrangle, and an ellipse can be adopted. The diameter of the liquid injection port 5a can be selected as appropriate according to the size of the battery. The lid 5 is made of aluminum or aluminum alloy.

The sealing of the liquid injection port 5a with the positive electrode terminal 2 is shown in FIG.
It becomes like C. The positive electrode terminal 2 is placed on the liquid injection port 5a. The center of the liquid injection port 5a is aligned with the center of the positive electrode terminal 2.
The positive electrode terminal 2 and the lid 5 are laser-welded. As the welding method, ultrasonic welding or the like can be adopted in addition to laser welding. Besides welding, pressure welding etc. can also be adopted. Welding is performed in a portion concentric with the liquid injection port 5a. The diameter of the welded portion 2a is larger than the diameter of the liquid injection port 5a. The liquid injection port 5a is sealed by the formation of the welded portion 2a.

The positive electrode terminal 2 is, in addition to the example shown in FIG.
It is possible to employ a rectangular plate having a protrusion similar to the protrusion 6b shown in FIG. The cross-sectional shape of the convex portion is the same as the cross-sectional shape of the liquid injection port 5a. The size of the cross-sectional shape of the protrusion is slightly smaller than or slightly larger than the size of the cross-sectional shape of the liquid injection port 5a. The protrusion is made of aluminum or aluminum alloy. The convex portion is fixed to the rectangular plate by welding or the like.

A convex portion is put in the liquid injection port 5a. When the cross-sectional shape of the convex portion is slightly larger than the cross-sectional shape of the liquid injection port 5a, the convex portion is press-fitted into the liquid injection port 5a. The positive electrode terminal 2 and the lid 5 are laser-welded. As the welding method, ultrasonic welding or the like can be adopted in addition to laser welding. Besides welding, pressure welding etc. can also be adopted. Welding is performed in a portion concentric with the liquid injection port 5a. The diameter of the welded portion is larger than the diameter of the liquid injection port 5a. The injection port 5a is sealed by the formation of the welded portion.

The presence of the convex portion facilitates the positioning of the positive electrode terminal 2 with respect to the liquid injection port 5a. When the size of the cross-sectional shape of the convex part is slightly larger than the size of the cross-sectional shape of the liquid injection port 5a, it is possible to prevent the electrolytic solution from rising between the inside of the liquid injection port 5a and the convex part. .

FIG. 3 is a sectional view (2) showing the sealing portion of the battery of the present invention. The positive electrode terminal 2 is, as shown in FIG.
The convex portion 2b is formed on one surface of the rectangular plate. The size of the cross-sectional shape of the convex portion 2b has two levels. The rectangular plate of the positive electrode terminal 2 is made of a nickel-aluminum clad material, an iron-aluminum clad material, a stainless steel-aluminum clad material, or the like. Convex portion 2b
Is made of resin or rubber. The rectangular plate and the convex portion 2b are bonded by an adhesive.

The liquid injection port 5b is a hole penetrating the lid 5 as shown in FIG. 3B. The diameter of the liquid injection port 5b has two stages. The material of the lid 5 is the same as the above-mentioned example.

The sectional shape of the convex portion 2b is the same as the sectional shape of the liquid injection port 5b. The cross-sectional size of the convex portion 2b is slightly smaller than the cross-sectional size of the liquid injection port 5b.

The injection port 5b is sealed with the positive electrode terminal 2 as shown in FIG.
It becomes like C. The convex portion 2b of the positive electrode terminal 2 is put in the liquid injection port 5b. Part of two sides of the rectangle of the positive electrode terminal 2 and the lid 5 are laser-welded. Welding method is laser welding,
Ultrasonic welding, resistance welding, etc. can be adopted. Besides welding, pressure welding and the like can also be adopted. The ring-shaped flat surface formed on the stepped portion of the convex portion 2b and the ring-shaped flat surface formed on the stepped portion of the liquid injection port 5b are in pressure contact with each other. The liquid injection port 5b is sealed by this pressure contact.

The presence of the convex portion 2b facilitates the positioning of the positive electrode terminal 2 with respect to the liquid injection port 5a. Since the injection port 5a is sealed by the elasticity of the convex portion 2b, it is not necessary to surround the entire injection port 5b and perform welding.

A method of manufacturing the battery of the present invention will be described.
FIG. 4 shows an assembly procedure (1) of one example of the battery of the present invention, and FIG. 5 shows an assembly procedure (2) of one example of the battery of the present invention. As shown in A of FIG. 4, the power generation element 3 is housed in the battery container 1. As shown in FIG. 4B, the negative electrode lead 3d is welded to the negative electrode terminal 7. The negative electrode lead 3d is connected to the power generation element 3. The negative electrode terminal 7 is attached to the lid body 5. As shown in C of FIG. 4, the opening of the battery container 1 is sealed with the lid 5. The portion where the outer periphery of the lid 5 and the inside of the battery container 1 are in contact is welded. As shown in D of FIG.
The electrolytic solution is injected from the injection port 5a, and the electrolytic solution is impregnated in the power generating element 3.

As shown in FIG. 5E, the injection port 5a is sealed by the positive electrode terminal 2. As the positive electrode terminal 2, any of the rectangular plate-shaped positive electrode terminal 2, the positive electrode terminal 2 having a convex portion, and the positive electrode terminal 2 having a convex portion 2b made of resin or the like described in FIGS. it can. As shown in F of FIG. 5, the outer lead body 12 is welded to the negative electrode terminal 7, and the outer lead body 11 is welded to the positive electrode terminal 2.

The following effects can be obtained by the method for producing a battery of the present invention. In the conventional battery assembly procedure (2) (FIG. 20), the step of sealing the liquid injection port 5a with the sealing material 6 (FIG. 2)
0) and the step of welding the positive electrode terminal 2 onto the lid body 5 (F in FIG. 20) required two steps. In the assembly procedure (2) of one example of the battery of the present invention (FIG. 5), only the step of sealing the liquid injection port 5a with the positive electrode terminal 2 (E in FIG. 5) is sufficient. Assembly procedure (2) of one example of the battery of the present invention (FIG. 5)
In, the number of steps can be reduced by one. In one example of the battery of the present invention, the space occupied by the encapsulant 6 required for the conventional battery (FIG. 14) is unnecessary, so that the space can be effectively utilized.

FIG. 6 is a sectional view showing another example of the battery of the present invention. Differences between the battery of this example and the above-mentioned battery (FIG. 1) will be described. In the battery (FIG. 1) described above, the liquid injection port 5a is provided in the lid 5, whereas in the battery of this example (FIG. 6), the liquid injection port 5a is provided in the bottom of the battery container 1. ing. In the battery (FIG. 1) described above, the positive electrode terminal 2 was on the lid body 5, whereas in the battery (FIG. 6) of this example, the positive electrode terminal 2 was fixed to the bottom of the battery container 1. In the battery (FIG. 1) described above, the positive electrode terminal 2 is welded on the lid 5 as described in FIGS. 2 to 3, whereas in the battery (FIG. 6) of this example, the positive electrode terminal 2 is welded. 2 is welded to the bottom of the battery container 1. In the battery of this example (FIG. 6), the positive electrode terminal 2 described in FIGS.
Can be used. The welding method is the same as in FIGS. 2 to 3, and laser welding, ultrasonic welding, resistance welding, or the like can be adopted. In addition to welding, pressure welding can also be used.

In the battery (FIG. 1) described above, the positive electrode terminal 2 is welded onto the lid 5 as shown in E of FIG. 5, and the external lead body is attached onto the positive electrode terminal 2 as shown in F of FIG. Whereas 11 is welded, in the battery of this example, the positive electrode terminal 2 is welded to the bottom of the battery container 1, and the external lead body (not shown) is welded onto the positive electrode terminal 2. In other respects, the above-described battery (FIG. 1) and the battery of this example (FIG. 6) are the same. In the battery (FIG. 6) of this example, the same effects as those of the battery (FIG. 1) described above can be obtained.

FIG. 7 is a sectional view showing another example of the prismatic lithium ion secondary battery of the present invention. As shown in FIG. 7, the battery 10 includes a battery container 1, a power generating element 3, an insulator 4, a lid 5, a negative electrode terminal 7, a gasket 8, and an external lead body 11. The configuration of the battery 10 in FIG. 7 will be described in comparison with the configuration of the battery 10 described in FIG.

A liquid injection port 5a is formed on the left side of the upper surface of the lid 5 in the drawing. The liquid injection port 5a has a circular cross section. An external lead body 11 is placed on the liquid injection port 5a. The external lead wire 11 is a ribbon-shaped plate. The outer lead body 11 is placed so as to completely cover the liquid injection port 5a. The outer lead body 11 is made of a nickel-aluminum clad material or the like. The outer lead body 11 is welded to the lid body 5. The other configuration is the battery 10 described in FIG.
The configuration is the same.

A method of sealing the liquid injection port 5a with the external lead body 11 will be specifically described. FIG. 8 is a sectional view (1) showing the sealing portion of the battery of the present invention. The external lead body 11 is shown in FIG.
As shown in A of FIG. The outer lead body 11 is made of a nickel-aluminum clad material, an iron-aluminum clad material, a stainless steel-aluminum clad material, or the like.

The liquid injection port 5a is a hole penetrating the lid 5 as shown in FIG. 8B. The liquid injection port 5a has a circular cross section. However, the cross section is not limited to the circular shape, and other shapes such as a triangle, a quadrangle, and an ellipse can be adopted. The diameter of the liquid injection port 5a can be selected as appropriate according to the size of the battery. The lid 5 is made of aluminum or aluminum alloy.

The injection port 5a is sealed by the external lead body 11 as shown in FIG. 8C. The external lead body 11 is placed on the liquid injection port 5a. The outer lead body 11 and the lid body 5 are laser-welded. As the welding method, ultrasonic welding or the like can be adopted in addition to laser welding. Besides welding, pressure welding etc. can also be adopted. Welding is performed in a portion concentric with the liquid injection port 5a. The diameter of the welded portion 2a is larger than the diameter of the liquid injection port 5a. The liquid injection port 5a is sealed by the formation of the welded portion 2a.

As the external lead body 11, in addition to the example shown in FIG. 8, a ribbon-shaped plate having a protrusion similar to the protrusion 6b shown in FIG. 16 can be adopted. The cross-sectional shape of the convex portion is the same as the cross-sectional shape of the liquid injection port 5a. The size of the cross-sectional shape of the protrusion is slightly smaller than or slightly larger than the size of the cross-sectional shape of the liquid injection port 5a. The protrusion is made of aluminum or aluminum alloy. The convex portion is fixed to the ribbon-shaped plate by welding or the like.

A convex portion is put in the liquid injection port 5a. When the cross-sectional shape of the convex portion is slightly larger than the cross-sectional shape of the liquid injection port 5a, the convex portion is press-fitted into the liquid injection port 5a. The outer lead body 11 and the lid body 5 are laser-welded. As the welding method, ultrasonic welding or the like can be adopted in addition to laser welding. Besides welding, pressure welding etc. can also be adopted. Welding is injection port 5
This is done in the concentric circles with a. The diameter of the weld is 5a
Larger than the diameter of. Liquid injection port 5a due to formation of weld
Is sealed.

The presence of the convex portion facilitates the positioning of the external lead body 11 with respect to the liquid injection port 5a. When the size of the cross-sectional shape of the convex part is slightly larger than the size of the cross-sectional shape of the liquid injection port 5a, it is possible to prevent the electrolytic solution from rising between the inside of the liquid injection port 5a and the convex part. .

FIG. 9 is a sectional view (2) showing the sealing portion of the battery of the present invention. As shown in FIG. 9A, the external lead body 11 has a convex portion 11b formed on one surface of a ribbon-shaped plate. The size of the cross-sectional shape of the convex portion 11b has two levels. The ribbon-shaped plate of the outer lead body 11 is made of a nickel-aluminum clad material, an iron-aluminum clad material, a stainless steel-aluminum clad material, or the like. The convex portion 11b is made of resin or rubber. The ribbon-shaped plate and the convex portion 11b are bonded by an adhesive.

The liquid injection port 5b is a hole penetrating the lid 5 as shown in FIG. 9B. The diameter of the liquid injection port 5b has two stages. The material of the lid 5 is the same as the above-mentioned example.

The sectional shape of the convex portion 11b is the same as the sectional shape of the liquid injection port 5b. The size of the cross-sectional shape of the convex portion 11b is slightly smaller than the size of the cross-sectional shape of the liquid injection port 5b.

The injection port 5b is sealed with the external lead body 11 as shown in FIG. 9C. The convex portion 11b of the external lead body 11 is put into the liquid injection port 5b. A part of two sides of the ribbon-shaped plate of the outer lead body 11 and the lid body 5 are laser-welded. As the welding method, in addition to laser welding, ultrasonic welding, resistance welding, or the like can be adopted. Besides welding, pressure welding and the like can also be adopted. The ring-shaped flat surface formed on the stepped portion of the convex portion 11b and the ring-shaped flat surface formed on the stepped portion of the liquid injection port 5b are in pressure contact with each other. The liquid injection port 5b is sealed by this pressure contact.

The presence of the convex portion 11b facilitates the positioning of the external lead body 11 with respect to the liquid injection port 5b. Convex part 1
Since the liquid injection port 5b is sealed by the elasticity of 1b, there is no need to surround the entire liquid injection port 5b and perform welding.

A method of manufacturing the battery of the present invention will be described.
FIG. 10 shows an assembly procedure (1) of another example of the battery of the present invention, and FIG. 11 shows an assembly procedure (2) of another example of the battery of the present invention. As shown in A of FIG. 10, the power generation element 3 is housed in the battery container 1. As shown in B of FIG. 10, the negative electrode lead 3d is welded to the negative electrode terminal 7. The negative electrode lead 3d is connected to the power generation element 3. The negative electrode terminal 7 is attached to the lid body 5. As shown in C of FIG.
The opening of the battery container 1 is sealed with the lid 5. The portion where the outer periphery of the lid 5 and the inside of the battery container 1 are in contact is welded. Figure 1
As shown in D of 0, the electrolytic solution is injected from the injection port 5a,
The electrolytic solution is soaked in the power generating element 3.

As shown in FIG. 5E, the external lead body 11
The liquid injection port 5a is sealed by. The outer lead body 11 is the ribbon-shaped outer lead body 11 described with reference to FIGS.
Both the external lead body 11 having a convex portion and the external lead body 11 having a convex portion 11b made of resin or the like can be used. The external lead body 12 is welded to the negative electrode terminal 7.

The following effects can be obtained by the method for producing a battery of the present invention. In the conventional battery assembly procedure (2) (FIG. 20), the step of sealing the liquid injection port 5a with the sealing material 6 (FIG. 2)
0E), the step of welding the positive electrode terminal 2 on the lid body 5 (F in FIG. 20), the outer lead wire 12 is welded to the negative electrode terminal 7, and the outer lead body 11 is welded to the positive electrode terminal 2. The process (G in FIG. 20) required three processes. In the assembly procedure (2) of another example of the battery of the present invention (FIG. 11), the external lead body 12 is welded to the negative electrode terminal 7, and the external lead body 1 is welded.
Only the step of sealing the liquid injection port 5a by 1 (E in FIG. 11) is sufficient. Assembling procedure (2) of another example of the battery of the present invention (see FIG.
In 1), the number of steps can be reduced by two. In another example of the battery of the present invention, the area occupied by the sealing material 6 required in the conventional battery (FIG. 14) is unnecessary, so that the space can be effectively utilized.

FIG. 12 is a sectional view showing another example of the battery of the present invention. Differences between the battery of this example and the above-described battery (FIG. 7) will be described. In the battery (FIG. 7) described above, the liquid injection port 5a is provided in the lid 5, whereas in the battery (FIG. 1) of this example.
In 2), the liquid injection port 5a is provided at the bottom of the battery container 1. In the battery (FIG. 7) described above, the external lead body 11 was on the lid 5, whereas in the battery of this example (FIG. 12),
The outer lead body 11 is fixed to the bottom of the battery container 1.
In the battery (FIG. 7) described above, as described in FIGS.
The outer lead body 11 is welded on the lid body 5, whereas in the battery of this example (FIG. 12), the outer lead body 11 is welded to the bottom of the battery container 1. The battery of this example (Fig. 1
In 2), the external lead body 11 described in FIGS. 8 to 9 can be used. The welding method is the same as in FIGS. 8 to 9, and laser welding, ultrasonic welding, resistance welding, or the like can be adopted. In addition to welding, pressure welding can also be used.

In the battery (FIG. 7) described above, the outer lead body 11 is welded onto the lid body 5 as shown in E of FIG. 11, whereas in the battery of this example, the outer lead body 11 is It is welded to the bottom of the battery container 1. In other respects, the above-described battery (FIG. 7) and the battery of this example (FIG. 12) are the same. In the battery (FIG. 12) of this example, the same effect as that of the battery (FIG. 7) described above can be obtained.

FIG. 13 is a sectional view showing another example of the battery of the present invention. In the cylindrical battery of this example, the liquid injection port 5 a is provided at the bottom of the battery container 1. In the battery of this example, the positive electrode terminal 2 is fixed to the bottom of the battery container 1. In the battery of this example, the positive electrode terminal 2 is welded to the bottom of the battery container 1. The positive electrode terminal 2 of this example can be similarly employed by replacing the rectangular plate of the positive electrode terminal 2 of FIGS. 2 to 3 with a circular plate. The welding method is the same as in FIGS. 2 to 3, and laser welding, ultrasonic welding, resistance welding, or the like can be adopted. In addition to welding, pressure welding can also be used.

In the battery of FIG. 13, an external lead body may be fixed to the bottom of the battery container 1 instead of the positive electrode terminal 2. In the battery of this example, the external lead body is the battery container 1.
Is welded to the bottom of. As the external lead wire of this example, the external lead body 11 shown in FIGS. The welding method is the same as in FIGS. 8 to 9, and laser welding, ultrasonic welding, resistance welding, or the like can be adopted. In addition to welding, pressure welding can also be used.

In the present embodiment, the prismatic and cylindrical lithium ion secondary batteries have been described. However, the invention is not limited to these batteries. In addition, the present invention can be applied to lithium primary batteries, alkaline secondary batteries, and the like.

From the above, according to the present embodiment,
In a battery including an inlet for injecting an electrolytic solution, which is provided in the bottom or lid of a battery container, since the inlet is sealed by a terminal, or the bottom or lid of the battery container Since the method includes the step of injecting the electrolytic solution from the injection port provided in and the step of sealing the injection port with the terminal, the terminal can also serve to seal the injection port. Therefore,
The number of processing steps can be reduced.

Since the terminal has the convex portion and the convex portion is in the liquid injection port, the movement of the terminal in the plane direction can be regulated. Therefore, the positioning of the terminals can be facilitated.

In a battery including a liquid injection port for injecting an electrolytic solution provided in the bottom or lid of a battery container, the liquid injection port is sealed by an external lead body, or Since there is a step of injecting the electrolytic solution from the injection port provided on the bottom or lid of the container and a step of sealing the injection port with an external lead body, the external lead body seals the injection port. The role to play and the role to replace the terminal can be fulfilled. Therefore, the number of processing steps can be further reduced.

Since the external lead body has a convex portion and this convex portion is inside the liquid injection port, the movement of the external lead body in the planar direction can be regulated. Therefore, the positioning of the external lead body can be facilitated.

It is needless to say that the present invention is not limited to the above-mentioned embodiment and can take various other configurations without departing from the gist of the present invention.

[0090]

The present invention has the following effects. In a battery including an inlet for injecting an electrolytic solution, which is provided in the bottom or lid of a battery container, since the inlet is sealed by a terminal, or the bottom or lid of the battery container Since it has a step of injecting an electrolytic solution from an injection port provided in, and a step of sealing the injection port with terminals,
The number of processing steps can be reduced.

Since the terminal has a convex portion and this convex portion is inside the liquid injection port, the positioning of the terminal can be facilitated.

In a battery provided with a bottom or a lid of a battery container and including a liquid injection port for injecting an electrolytic solution, the liquid injection port is sealed by an external lead body, or Since the process includes the step of injecting the electrolytic solution from the injection port provided on the bottom of the container or the lid and the step of sealing the injection port with the external lead body, the number of processing steps can be further reduced.

Since the external lead wire has a convex portion and this convex portion is inside the liquid injection port, the positioning of the external lead wire can be facilitated.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a battery of the present invention.

FIG. 2 is a sectional view (1) showing a sealing portion of the battery of the present invention.

FIG. 3 is a sectional view (2) showing a sealing portion of the battery of the present invention.

FIG. 4 is a diagram showing an assembly procedure (1) of an example of the battery of the present invention.

FIG. 5 is a diagram showing an assembly procedure (2) of an example of the battery of the present invention.

FIG. 6 is a cross-sectional view showing another example of the battery of the present invention.

FIG. 7 is a cross-sectional view showing another example of the battery of the present invention.

FIG. 8 is a sectional view (1) showing a sealing portion of the battery of the present invention.

FIG. 9 is a sectional view (2) showing the sealing portion of the battery of the present invention.

FIG. 10 is a diagram showing an assembly procedure (1) of another example of the battery of the present invention.

FIG. 11 is a view showing an assembling procedure (2) of another example of the battery of the present invention.

FIG. 12 is a cross-sectional view showing another example of the battery of the present invention.

FIG. 13 is a cross-sectional view showing another example of the battery of the present invention.

FIG. 14 is a sectional view showing an example of a conventional battery.

FIG. 15 is a sectional view (1) showing a sealing portion of a conventional battery.

FIG. 16 is a sectional view (2) showing a sealing portion of a conventional battery.

FIG. 17 is a sectional view (3) showing a sealing portion of a conventional battery.

FIG. 18 is a cross-sectional view showing a positive electrode terminal portion of a conventional battery.

FIG. 19 is a diagram showing a conventional battery assembly procedure (1).

FIG. 20 is a diagram showing a procedure (2) for assembling a conventional battery.

FIG. 21 is a cross-sectional view showing another example of a conventional battery.

[Explanation of symbols]

1 ... Battery container, 2 ... Positive electrode terminal, 2a ... Welded portion, 2
b ... convex portion, 3 ... power generation element, 3a ... positive electrode, 3b ...
Separator, 3c Negative electrode, 3d Negative electrode lead, 3e
・ ・ ・ Cathode lead, 4 ・ ・ ・ Insulator, 5 ・ ・ ・ Lid,
5a, 5b ... Liquid injection port, 6 ... Sealing material, 6a ... Welding part, 6b, 6c ... Projection, 7 ... Negative electrode terminal, 8 ... Gasket, 10 ... Battery, 11 ... External Lead body, 11a
... Welded part, 11b ... Protruded part, 12 ... External lead body

Claims (16)

[Claims] 1. A battery container for accommodating a power generating element, a lid for sealing an opening of the battery container, and a liquid injection solution provided on the battery container or the lid for injecting an electrolytic solution. A battery including a mouth, wherein the liquid injection port is sealed by a terminal. 2. The battery according to claim 1, wherein the liquid injection port is provided in the lid. 3. The battery according to claim 1, wherein the liquid injection port is provided at the bottom of the battery container. 4. The battery according to claim 1, wherein the terminal has a convex portion, and the convex portion is inside the liquid injection port. 5. A battery container for accommodating a power generating element, a lid for sealing the opening of the battery container, and a liquid injection device provided on the battery container or the lid for injecting an electrolytic solution. A battery including a mouth, wherein the liquid injection port is sealed by an external lead body. 6. The battery according to claim 5, wherein the liquid injection port is provided in the lid. 7. The battery according to claim 5, wherein the liquid injection port is provided at the bottom of the battery container. 8. The battery according to claim 5, wherein the external lead body has a convex portion, and the convex portion is inside the liquid injection port. 9. A step of accommodating a power generation element in a battery container, a step of sealing an opening of the battery container with a lid, and an electrolytic solution from an injection port provided in the battery container or the lid. A method of manufacturing a battery, comprising a step of injecting a liquid, and a step of sealing the liquid injection port with a terminal. 10. The method of manufacturing a battery according to claim 9, wherein the liquid injection port is provided in the lid. 11. The method of manufacturing a battery according to claim 9, wherein the liquid injection port is provided at the bottom of the battery container. 12. The method of manufacturing a battery according to claim 9, wherein the terminal has a convex portion, and the convex portion is in the liquid injection port. 13. A step of accommodating a power generation element in a battery container, a step of sealing an opening of the battery container with a lid, and an electrolytic solution from an injection port provided in the battery container or the lid. A method of manufacturing a battery, comprising a step of injecting a liquid and a step of sealing the liquid injection port with an external lead body. 14. The method for manufacturing a battery according to claim 13, wherein the liquid injection port is provided in the lid. 15. The method of manufacturing a battery according to claim 13, wherein the liquid injection port is provided at the bottom of the battery container. 16. The external lead body has a convex portion, and the convex portion is inside the liquid injection port.
A method for manufacturing the battery described above.