JP2001118604A - Non-aqueous electrolytic solution type secondary battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To aim at providing a non-aqueous electrolytic solution type secondary battery that can safely release the inner battery energy that has yet to be released. SOLUTION: This battery has an electro-conductive member that is succeedingly installed at one part of the inner wall of a core, and the load for an energy relief inside of such electro-conductive member is installed, and through a lead connected at such electro-conductive member, the electro- conductive member operates a safety mechanism that is connected at either a positive electrode or a negative electrode, and releases the energy stored at a battery element.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary battery using a non-aqueous electrolyte, and more particularly to a non-aqueous electrolyte secondary battery capable of charging and discharging at a high current density.

[0002]

2. Description of the Related Art In general, a non-aqueous electrolyte secondary battery is represented by a lithium ion secondary battery using a negative electrode capable of doping and undoping lithium and a positive electrode containing a transition metal compound. In addition, a nonaqueous electrolyte secondary battery has a band-shaped negative electrode in which a band-shaped negative electrode side current collector is coated with a negative electrode active material, and a band-shaped positive electrode in which a band-shaped positive electrode side current collector is coated with a positive electrode active material, via a separator. Are laminated with an exterior material.
Alternatively, a stack of the strip-shaped negative electrode and the strip-shaped positive electrode is spirally wound to form a battery element called a cylindrical jelly roll, and then housed in a battery can to form a battery. ing. In particular, a battery in which a cylindrical battery element is housed in a battery can has excellent sealing properties and is cylindrical, so that a uniform battery reaction can be performed irrespective of the portion of the laminate. have. In addition, cylindrical batteries occupy an important position in non-aqueous electrolyte secondary batteries used for the purpose of extracting a large current, and are also expected to be used as large-sized batteries for powering electric vehicles, electric assist bicycles, and the like. ing.

[0003] Next, regarding a conventional non-aqueous electrolyte secondary battery,
This will be described with reference to the drawings. FIG. 8 is a sectional view showing a conventional non-aqueous electrolyte secondary battery. The non-aqueous electrolyte secondary battery shown in FIG. 8 is cylindrical. Such a non-aqueous electrolyte secondary battery has a band-shaped negative electrode 3 in which a negative electrode current collector is provided with a negative electrode active material and a band-shaped positive electrode in which a positive electrode current collector is provided with a positive electrode active material, in a battery outer can 5. And 2. A battery element including a core 4, a separator 1, a negative electrode 3, and a positive electrode 2, which is wound in a stacked manner with a separator 1 wider than the negative electrode 3 and the positive electrode 2 interposed therebetween, is provided in the battery outer can 5. Is provided. Both end surfaces of such a battery element are constituted by the ends of the separator 1 without the positive electrode 2 or the negative electrode 3 protruding. In the case of a non-aqueous electrolyte secondary battery in which the battery outer can 5 has the negative electrode side, the strip-shaped input / output lead 15a attached to the strip-shaped negative electrode 3 is connected to the battery outer can 5 by a method such as welding. Joined to the inner wall. The input / output lead 15a has a pressure release valve that releases internal pressure when an abnormal pressure rise inside the battery, a current cutoff mechanism that cuts off current, and the like. Further, the input / output extraction lead 15a
Also serves as a positive electrode side, a cap 20, a nickel ring 21, a rupture disk 22, a weld plate 19
And a gasket 23.

Next, a safety mechanism of the header section will be described with reference to the drawings. FIG. 9A is a diagram showing an example of a constituent member of a header portion of the present invention and a conventional non-aqueous electrolyte secondary battery.
FIG. 9B is a cross-sectional view illustrating a safety mechanism of the present invention and a conventional non-aqueous electrolyte secondary battery. The header portion 10 includes a cap 20, a nickel ring 21, a rupture disk 2,
2, a weld plate 19 and a gasket 23. After assembling such a configuration, a header assembly side view (when the safety mechanism is not operating) 30 is obtained.

[0005] Side view of header assembly (when safety mechanism operates 1) 3
In the case of 1, the gas pressure inside the battery is increased due to overcharging or abnormal temperature rise inside the battery. Then, header assembly side view 3
1 inverts the rupture disk 22 to cut off an electric path between the rupture disk 22 and the weld plate 19, thereby making it impossible to input and output energy to the outside of the battery. The header assembly side view (when the safety mechanism operates 2) 32 is a header assembly side view (when the safety mechanism is operating 1) 31. The reaction proceeds due to heat generation after the safety mechanism operates, and as a result, the inside of the battery is Gas pressure further rises. In the header assembly side view 32 in this case, the broken notch portion of the inverted rupture disk 22 is broken, gas is released to the outside, and explosion of the battery can be avoided.

[0006]

However, the conventional non-aqueous electrolyte secondary battery described above has the following problems. Referring to FIG. 8 and FIG. 9, the conventional non-aqueous electrolyte secondary battery is a safety mechanism that locks the energy inside the battery and creates a state where it cannot be output to the outside. Once the mechanism operates, the connection between the battery element and the battery outer can 5 and the cap 20, which are external terminals, is cut off, so that energy cannot be released.
Therefore, in order to release the energy inside the battery that cannot be released, the side wall of the battery outer can 5 is forcibly short-circuited by a means such as piercing a nail. In such a means, the energy inside the battery can be released. However, there is a problem that not only the equipment becomes large and the cost increases, but also there is a possibility of ignition, smoking, explosion and the like, which is a very dangerous operation.

The present invention has been made in view of the above-mentioned problems in the prior art, and has as its object to provide a non-aqueous electrolyte secondary battery that can safely release the energy inside the battery that cannot be released. Aim.

[0008]

Means for Solving the Problems According to the first invention of the present application for solving the above-mentioned problems, a positive electrode current collector and a negative electrode current collector having a positive electrode active material layer and a negative electrode active material layer laminated via a separator are provided. A non-aqueous electrolytic solution having a battery element wound around a core of an insulating member as an axis inside a battery outer can, and the battery element being electrically connected to a positive electrode head and a negative electrode battery outer can bottom. In the secondary battery, a conductive member is provided continuously to a part of the inner wall of the core, and has a load for energy release inside the conductive member and via a lead connected to the conductive member. A nonaqueous electrolyte secondary battery having a safety mechanism in which a conductive member is connected to a positive electrode or a negative electrode.

Therefore, according to the non-aqueous electrolyte secondary battery of the first invention of the present application, a conductive member is provided continuously on a part of the inner wall of the core, and energy is discharged into the conductive member. Since there is a safety mechanism in which the conductive member is connected to the positive electrode or the negative electrode through the lead connected to the conductive member having a load for use, the outer side wall of the battery outer can is pressed in the core direction. By plastically deforming the outer side wall of the battery outer can, the load for discharging energy inside the core is brought into contact with the conductive member to form an electrical path. That is, an electric path can be formed by operating the safety mechanism. As a result, the energy inside the battery that cannot be released can be released safely.

Further, the second invention of the present application is characterized in that the load for discharging energy includes a discharging load and a discharging load lead extending from the discharging load in a positive electrode direction and a negative electrode direction. And

Therefore, according to the non-aqueous electrolyte secondary battery of the second invention of the present application, the energy discharging load is:
Since it consists of a discharge load and a discharge load lead extending from the discharge load in the positive and negative directions, the outer side wall of the battery outer can is pressed toward the core, and the outer side wall of the battery outer can is plastically deformed. By doing so, the discharge load lead held by the insulator inside the core and the conductive member are brought into contact with each other to form an electric path. As a result, the energy inside the battery that cannot be released can be released safely.

Further, the third invention of the present application is directed to an extension of the discharge load lead extending in one of the positive electrode direction and the negative electrode direction among the discharge load leads extending in the positive electrode direction and the negative electrode direction. And a short-circuit terminal connected to the electrode in a predetermined direction is provided at a predetermined interval in an extending direction of the discharge load lead.

Therefore, according to the nonaqueous electrolyte secondary battery of the third invention of the present application, of the discharge load leads extending in the positive electrode direction and the negative electrode direction, the discharge load leads extend in one of the positive electrode direction and the negative electrode direction. Since the short-circuit terminal connected to the electrode in the extension direction of the discharge load lead to be extended is provided at a predetermined interval in the extension direction of the discharge load lead, the short-circuit terminal is connected. By pressing the electrode from the outside of the battery outer can in the direction of the other electrode, the other discharge load lead and the short-circuit terminal are brought into contact with each other to form an electric path. As a result, the energy inside the battery that cannot be released can be released safely.

Further, the fourth invention of the present application is characterized in that an insulating discharge load lead guide is provided on the inner peripheral edge of the conductive member so as to be in contact with the discharge load lead.

Therefore, according to the non-aqueous electrolyte secondary battery of the fourth invention of the present application, an insulating discharge load lead guide is provided on the inner peripheral edge of the conductive member so as to be in contact with the discharge load lead. Therefore, the discharge load lead can be held at a predetermined position. That is, it is possible to prevent a short circuit caused by contact between the conductive member formed on the core peripheral portion and the discharge load lead.

Further, the fifth invention of the present application is characterized in that a mark is provided on an outer side wall of the battery outer can in correspondence with a portion where the discharge load lead guide is located.

Therefore, according to the nonaqueous electrolyte secondary battery of the fifth invention of the present application, the mark is provided on the outer side wall of the battery outer can in accordance with the position where the discharge load lead guide is located. Then, a predetermined portion other than the mark provided on the outer side wall of the battery outer can is pressed, and the battery outer can is plastically deformed, so that the load for energy release held by the insulator inside the core and the conductive member are applied. Thus, the workability in forming the electric path can be improved.

Further, the sixth invention of the present application is directed to a mark on the outer side wall of the battery outer can corresponding to a portion where the discharge load lead provided inside the conductive member and the inner wall of the conductive member face each other. Is provided.

Therefore, according to the non-aqueous electrolyte secondary battery of the sixth invention of the present application, the discharge load lead provided inside the conductive member corresponds to the portion where the inner wall of the conductive member faces. Since the mark is provided on the outer side wall of the battery outer can, the mark is pressed, and the battery outer can is plastically deformed to bring the load for energy release inside the core into contact with the conductive member, and The pushing position (crushing position) at the time of forming the target path can be visually confirmed. Therefore, workability at the time of forming an electric path can be improved.

Further, the seventh invention of the present application is characterized in that a mark is provided at a predetermined portion of the battery outer can where the electrode to which the short-circuit terminal is connected is located.

Therefore, according to the non-aqueous electrolyte secondary battery of the seventh aspect of the present invention, the mark is provided at a predetermined portion of the battery outer can where the electrode to which the short-circuit terminal is connected is located. And press the battery outer can plastically to bring the load for energy release inside the core into contact with the short-circuit terminal to visually determine the position of the pushed-in position (crushed position) when forming an electrical path. You can figure out.
Therefore, workability at the time of forming an electric path can be improved.

Further, the eighth invention of the present application is characterized in that the mark is a projection.

Therefore, according to the nonaqueous electrolyte secondary battery of the eighth invention of the present application, since the mark is a convex portion, the core is formed by pressing the convex portion and plastically deforming the battery outer can. When the internal energy release load is brought into contact with the conductive member or the short-circuit terminal, it is possible to visually confirm the pushing amount when the electric path is formed. Therefore,
Workability at the time of forming an electric path can be improved.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A non-aqueous electrolyte secondary battery according to an embodiment of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a sectional view of a nonaqueous electrolyte secondary battery according to Embodiment 1 of the present invention.

As shown in FIG. 1, a nonaqueous electrolyte secondary battery according to Embodiment 1 of the present invention has a positive electrode current collector (a positive electrode current collector having a positive electrode active material layer and a negative electrode active material layer The positive electrode 2) and the negative electrode current collector (negative electrode 3) are composed of the core 4
Is housed inside the battery outer can 5. Also,

The configuration of the safety mechanism of the nonaqueous electrolyte secondary battery according to Embodiment 1 of the present invention will be described. On a part of the inner wall of the core 4, a conductive member 6 (hereinafter referred to as a short-circuit and heat radiation electrode 7) having leads connected to the bottom 8 of the battery outer can 5 is formed over the entire inner circumference. The short-circuit and heat-dissipating electrode 7 is connected to the can bottom 8 serving as a negative electrode. Discharge load leads extending from the discharge load 9 in the positive electrode direction and the negative electrode direction are provided inside the core 4. The discharge load lead 1 is a discharge load lead 1 connected to the header 10 serving as a positive electrode.
1a and discharge load lead 1 extending in the direction of can bottom 8
1b. The discharge load lead is an insulating discharge load lead guide 12 provided on the inner surface of the core 4.
Accordingly, the short-circuit and heat radiation electrode 7 and the discharge load lead are held so as not to come into contact with each other. The discharge load 9 and the discharge load lead are provided as loads for releasing energy.

An insulating ring 14 is provided on the bottom end face 13 of the battery element, and at least one or more input / output lead 15 a attached to the negative electrode current collector is connected to an opening 16 provided in the insulating ring 14. It extends so as to be connected to the can bottom 8. The insulating ring 14 is mechanically fitted with a short-circuit and heat radiation electrode and a caulking ring 17a, and then joined to the inner wall of the battery outer can 5 by welding. An insulating ring 14 is provided on the upper end surface 18 of the battery element, and at least one or more input / output lead 15 b attached to the positive electrode current collector is connected to a header 16 through an opening 16 provided in the insulating ring 14. It is extended so as to be connected to the unit 10. The insulating ring 14 is mechanically fitted with the short-circuit and heat radiation electrode 7 and the caulking ring 17b, and then joined to the weld plate 19 of the header 10 by welding.

The header section 10 comprises a cap 20, a nickel ring 21, a rupture disk 22, a weld plate 19, and a gasket 23. The header part 10 seals the nonaqueous electrolyte secondary battery by caulking the upper part of the battery outer can 5 via a gasket 23 using an exclusive caulking machine after injecting the electrolyte. The header section 10 is provided with a disconnect mechanism for interrupting the current and a burst mechanism which operates when the internal pressure rises due to an abnormality inside the battery and releases the internal pressure. Further, an element or the like for interrupting an excessive current may be provided. The external take-out welding point 24a joined to the weld plate 19 and the external take-out weld point 24b joined to the inner wall of the battery outer can 5 are joined using resistance welding, ultrasonic welding or laser welding.

The battery outer can 5 is provided with a mark (not shown) indicating the position of the discharge load lead guide 12 and / or a mark (not shown) indicating the crushed position on the outer side wall. In addition, by setting the mark indicating the crushed position as a convex portion (not shown), it is possible to visually confirm the specified amount of pushing. As a result, workability during operation of the safety mechanism is improved. Further, the projection has a length corresponding to the pushing amount. The crushed position is the short-circuit and heat radiation electrode 7 where the discharge load lead guide 12 is not provided.
Outer side surface 25 of battery outer can 5 corresponding to the portion where
Point to.

For the input / output lead 15a and the caulking ring 17a, an electrically stable material is used as the positive electrode material of the battery. For example, it is preferable to use aluminum or the like. For the input / output lead 15b and the caulking ring 17b, a material that is electrically stable is used as a negative electrode material of the nonaqueous electrolyte secondary battery. For example, it is preferable to use nickel or copper. Insulation ring 1
4. The inside of the core 4 and the discharge lead guide 12 are made of a material which is hardly corroded by the electrolyte. For example, it is preferable to use polypropylene, polypropylene, or the like. Further, for the core 4, a metal material equivalent to the metal foil that comes into contact at the beginning of winding may be used. The short-circuit and heat radiation electrode 7 and the discharge negative electrode lead are made of a material having resistance to electrolyte, conductivity and heat conductivity. For example, it is preferable to use copper, nickel, aluminum, or the like. In addition, these members may be provided with a resistance component so that the members emit energy when the safety mechanism operates. Further, these members have an effect of dispersing generated heat. In addition, the discharge load lead is disposed and held at the center of the discharge load diameter. The size of the discharge load 9 is set within 1/5 of the total height of the battery, and at least one or more is provided in the battery outer can 5. The outer periphery of the discharge load 9 is coated with a material having heat conductivity, insulation and electrolyte resistance. For example, it is preferable to use a hermetic resistor sealed with an insulating material such as glass or ceramic.

The power generating element of the nonaqueous electrolyte secondary battery according to Embodiment 1 of the present invention will be described in more detail with reference to the drawings. FIG. 2 is a schematic configuration diagram illustrating an example of a power generation element of the nonaqueous electrolyte secondary battery according to Embodiment 1 of the present invention. The positive electrode active material layer is intermittently applied to both sides of the positive electrode current collector such that the applied portion and the uncoated portion overlap. The negative electrode active material is intermittently applied to both surfaces of the positive electrode 2 and the negative electrode current collector, where the input / output lead 15b is joined to the uncoated portion of the positive electrode active material layer, such that the coated portion and the uncoated portion overlap. The negative electrode 3 in which the input / output lead 15a is joined to the non-coated portion of the negative electrode active material is wound around the core 4 so as to be stacked via the separator 1 wider than the negative electrode 3 and the positive electrode 2. The power generation element is obtained by turning it. Further, the width of the negative electrode 3 is set wider than that of the positive electrode 2 so that the material doped from the positive electrode active material in the negative electrode active material layer serving as the counter electrode of the positive electrode active material layer does not precipitate other than in the negative electrode active material layer. It has been like that.

The configuration, operation and effect of the header section 10 are the same as those of the conventional header section. However, the problem in the conventional non-aqueous electrolyte secondary battery having such a header portion is solved by adopting the configuration of the present invention. Therefore, even when the safety mechanism of the header section 10 operates, the energy inside the battery can be released safely.

Next, the configuration of the non-aqueous electrolyte secondary battery according to Embodiment 1 of the present invention will be described with reference to FIGS. 3 (a) and 3 (b). FIG. 3A is a cross-sectional view of the non-aqueous electrolyte secondary battery according to the first embodiment of the present invention shown in FIG. FIG.
FIG. 2B is a cross-sectional view of the non-aqueous electrolyte secondary battery according to Embodiment 1 of the present invention shown in FIG. 1 taken along line BB ′.

The non-aqueous electrolyte secondary battery shown in FIG. 3 (a) has a discharge load 9, a short-circuit and heat radiation electrode 7, a core 4, a separator 1, a negative electrode 3, a positive electrode 2, and a battery exterior from the inside. It is composed of a can 5. The discharge load 9 is connected to the discharge load 9 so that the short-circuit and the heat radiation electrode 7 are not electrically short-circuited.
Are in contact at the outer peripheral portion. With this configuration, heat generated in the discharge load 9 is radiated to the outside through the inner wall of the battery outer can 5. The non-aqueous electrolyte secondary battery shown in FIG. 3B has a discharge load lead 11b, a discharge load lead guide 12, a short-circuit and heat radiation electrode 7, a core 4, a separator 1, a negative electrode 3, It comprises a positive electrode 2 and a battery outer can 5. With this configuration, heat generated by the discharge load is radiated to the outside through the inner wall of the battery outer can 5. The discharge load lead 11b is short-circuited and insulated from the heat radiation electrode 7 by the discharge load lead guide 12.

Next, the operation of the safety mechanism of the nonaqueous electrolyte secondary battery according to Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 4A is a schematic diagram showing the non-aqueous electrolyte secondary battery when the safety mechanism is not operated according to the first embodiment of the present invention. FIG. 4 (b)
FIG. 3 is a schematic diagram showing the nonaqueous electrolyte secondary battery during operation of the safety mechanism according to Embodiment 1 of the present invention. FIG. 4C is a schematic diagram showing a deformation operation of the battery outer can 5 in the nonaqueous electrolyte secondary battery during the operation of the safety mechanism according to the first embodiment of the present invention.

Referring to FIG. 4A, a non-aqueous electrolyte secondary battery when the safety mechanism is not operated according to the first embodiment of the present invention will be described. As shown in FIG. 4A, the discharge load 9, the discharge load lead 11 b, the discharge load lead guide 12, and the short-circuit and heat radiation electrode 7 are accommodated in the core 4. When the safety mechanism is not operating, discharge load lead 1
1b is electrically insulated from the short-circuit and heat radiation electrode 7 by the discharge load lead guide 12. Further, the discharge load 9 is a core 4 that is not easily affected by the deformation of the battery outer can 5.
Is provided at the end. Further, the circumference of the discharge lead guide 12 is fixed to the electrode 7 for short-circuit and heat radiation.
The diameter of the circumference is within 5 mm. The arrangement interval of the heat radiation lead guides 12 is set to be within 1/2 of the battery height so that the discharge load leads 11b are not short-circuited and do not contact the heat radiation electrodes 7.

Next, a non-aqueous electrolyte secondary battery during operation of the safety mechanism according to the first embodiment of the present invention will be described with reference to FIGS. 4 (b) and 4 (c). When the safety mechanism of the non-aqueous electrolyte secondary battery according to Embodiment 1 of the present invention operates, the outer side wall 25 of the battery outer can 5 is forcibly deformed as shown in FIG. That is, by deforming the outer side wall 25, the core 4 and the short-circuit and heat radiation electrode 7 are simultaneously deformed as shown in FIG. 4B. As a result, by electrically short-circuiting the discharge load lead 11b and the short-circuit / radiation electrode 7, the battery element and the discharge load lead 11 are short-circuited.
b, an electric path is formed, and energy can be output to the discharge load.

The operation of the safety mechanism will be described in more detail with reference to FIGS. 4 (b) and 4 (c). After attaching the temperature sensor 28 to the non-aqueous electrolyte secondary battery of Embodiment 1 of the present invention, the safety mechanism operating jig 26 having a round bar at the tip is moved to the safety mechanism operating stress direction 27 (in the direction of the core 4). Press The pressing operation causes the battery element and the discharge load lead 11b to be electrically short-circuited, and an electric path is formed to start discharging to the discharge load. After the heat radiation is started, the temperature sensor 28 monitors and confirms that the temperature has risen. The pushing amount for activating the safety mechanism should be within 1/8 of the battery diameter in order to avoid the same state as in the crush test. Further, since the safety mechanism is a means for discharging, if a temperature setting condition at the time of discharging of the discharging load 9 described below is satisfied, a connection surface between the short-circuit and heat radiation electrode 7 and the discharging load lead 11b is provided. The contact area for performing the discharge is not particularly defined because the resistance may be a resistance.

The setting conditions of the discharge load 9 differ depending on the system of the electrolytic solution and the maximum operating temperature. When the discharge load 9 is set to the maximum value, the discharge load 9 may be determined based on the maximum operating temperature of the battery and the temperature difference between the boiling points so that the electrolyte does not vaporize. However, in general, it is preferable to see a sufficient safety margin.
The maximum set power at the time of discharging is set to be 10 W or less. For example, when the discharge load 9 is set for a Li-ion secondary battery having a capacity of 10 Ah, a maximum use temperature of 60 ° C., and an electrolyte system of PC: EC: EMC, the following is performed. When using PC: EC; EMC as the electrolyte system, three types of boiling points and flash points are first investigated because even a mixed solvent vaporizes from a substance having a low boiling point. In this system, EMC has the lowest boiling point and flash point. In particular,
The boiling point is 108 ° C and the flash point is 23 ° C. The margin from the maximum operating temperature to the boiling point is 48 ° C. and 0.1 C (1
When discharging in A), the battery maximum voltage is 4.2V.
The maximum power at this time is 4.2 W, and it is safe even if the current continues to flow for a long time because it generates heat of about 4 ° C. at ΔT. Regarding the danger of sparking at the time of short-circuiting, sparking occurs when the voltage is high. Therefore, during the safety mechanism operation of the non-aqueous electrolyte secondary battery represented by the Li-ion secondary battery shown in Embodiment 1 of the present invention, the voltage per single cell is about 4.2 V at the maximum, There is no spark.

When the discharge load lead guide is not provided, the discharge load and the discharge load lead can be held by fitting or adhering the discharge load to the inner diameter of the conductive member. In addition, as long as an electric path is formed between the discharge load lead and the battery element as a result of plastic deformation of the battery outer can, the discharge load lead does not need to be connected to the positive electrode and the negative electrode.

Next, a method for manufacturing the nonaqueous electrolyte secondary battery according to Embodiment 1 of the present invention will be described below. (1) An electrode for short-circuit and heat dissipation is inserted into the core and joined to the inner wall of the core. (2) A part of the positive electrode active material and the negative electrode active material of the band-shaped positive electrode and the band-shaped negative electrode is removed. Alternatively, intermittent coating is performed to provide a portion where the positive electrode foil and the negative electrode foil are exposed. Next, an input / output extraction lead is joined to a portion where the positive electrode foil and the negative electrode foil are exposed, and a laminated body laminated around a core via a separator is wound around the core to form a battery element. (3) An insulating ring is attached to the end face of the battery element on the positive electrode side and the negative electrode side, and the input / output extraction leads of the positive electrode and the negative electrode are protruded from the openings of both insulating rings. Join mechanically. (4) An input / output extraction lead mechanically joined by a caulking ring after the battery element is housed in the battery outer can,
The conductive path is formed by joining the short-circuit and heat radiation electrode leads to the bottom of the can. It is desirable to set a large bonding area for bonding to the can bottom. The joining is performed using resistance welding, ultrasonic welding, or laser welding. (5) For the discharge load lead and short-circuit terminal of the discharge load,
The discharge load lead guide is fixed at a fixed interval and installed in the core. (6) Discharge load leads provided in a manner to protrude from the header side of the input / output extraction lead and the inside of the core are mechanically joined by a caulking ring, and the upper part of the battery outer can is grooved (grooved), and A step is formed on the inner wall. (7) The discharge load lead is joined to the header.
It is desirable to set a large joint area for joining with the header portion. The bonding is performed by using resistance bonding, ultrasonic bonding, laser bonding, or the like. (8) After injecting the electrolytic solution, the header is caulked with a battery outer can via a gasket to seal the battery.

The method of manufacturing a nonaqueous electrolyte secondary battery according to Embodiment 1 of the present invention described above is an example in which the battery outer can is used as the negative electrode. The can may be a positive electrode. In this case, the positive electrode and the negative electrode are reversed. When the discharge load lead guide is not provided, the discharge load and the discharge load lead can be held by fitting or adhering the discharge load to the inner diameter of the conductive member. In addition, as long as an electric path is formed between the discharge load lead and the battery element as a result of plastic deformation of the battery outer can, the discharge load lead does not need to be connected to the positive electrode and the negative electrode.

Embodiment 2 Next, a non-aqueous electrolyte secondary battery according to Embodiment 2 of the present invention will be described with reference to the drawings. FIG. 5 is a sectional view of a non-aqueous electrolyte secondary battery according to Embodiment 2 of the present invention. As shown in FIG. 5, the nonaqueous electrolyte secondary battery according to Embodiment 2 of the present invention has a structure in which a positive electrode 2 and a negative electrode 3 are laminated with a separator 1 interposed therebetween, and wound around a core 4 as an axis. Elements are formed. In the core 4, a short-circuit and heat radiation electrode 7, a short-circuit terminal 29, a discharge load lead guide 12, and a discharge load 9 are provided to form a safety mechanism.

On the inner wall inside the core 4 of the power generating element, a short-circuit and heat radiation electrode 7 is provided partially over the entire inner circumference. A discharge load 9 is provided inside the short-circuit and heat radiation electrode 7. A discharge load lead guide 12 is provided on the inner surface of the short-circuiting / radiating electrode 7. Further, the discharge load lead and the short-circuit terminal 29 are held inside the short-circuit and heat radiation electrode 7 by the heat radiation load lead guide 12. In addition, the discharge load lead is insulated from the short-circuit and heat radiation electrodes. An insulating ring 14 is provided on the bottom end face 13 of the power generating element. Further, at least one or more input / output extraction leads 15 a attached to the negative electrode current collector extend from an opening 16 provided in the insulating ring 14 so as to be connected to the can bottom 8. In addition, the input / output extraction lead 15a is mechanically fitted by the short-circuit and heat radiation electrode 7 and the caulking ring 17a, and then joined to the inner wall of the battery outer can 5 by welding. The insulating ring 14 is provided on the upper end face 18 of the power generating element. Further, at least one or more input / output lead 15 b attached to the end of the positive electrode current collector is connected to an opening 16 provided in the insulating ring 14.
It is extended from. In addition, the input / output lead 15b is connected to the short-circuit and heat radiation electrode 7 and the caulking ring 17.
b, and are joined to the weld plate 19 of the header portion 10 by welding.

The cap 20, the nickel ring 2
1, a rupture disc 22, a weld plate 19 and a gasket 23,
The battery is sealed by caulking the upper portion of the battery outer can 5 via the electrolyte solution 3 using an exclusive caulking machine after injecting the electrolytic solution. The external take-out welding point 24a joined to the weld plate 19 and the external take-out weld point 24b joined to the inner wall of the battery outer can 5 are joined using resistance welding, ultrasonic welding or laser welding. Header part 1
At 0, there is provided a disconnect mechanism that operates when the internal pressure rises due to the above inside of the battery to cut off the current and a burst mechanism that releases the internal pressure. Further, the header section 10 may be provided with an element or the like for interrupting an excessive current.

The battery outer can 5 has a mark (not shown) indicating the position of the discharge load lead guide on the outer side wall 25 and / or
Alternatively, by providing a mark (not shown) indicating the crushed position, the safety mechanism operation can be easily performed. Further, by setting the mark indicating the crushed position as a convex portion (not shown), it is possible to visually confirm the pressing of a specified amount. The crushed position refers to the outer side surface 25 of the battery outer can 5 corresponding to the portion where the short-circuit and heat radiation electrode 7 where the discharge load lead guide 12 is not provided is located. Further, in the non-aqueous electrolyte secondary battery according to Embodiment 2 of the present invention, it refers to the outside of the battery outer can 5 where the electrode connected to the short-circuit terminal 29 is located. In addition, among the crushing positions described above, the protrusion is provided at at least one crushing position.
As a result, workability during operation of the safety mechanism is improved. Further, the projection has a length corresponding to the pushing amount.

The input / output lead 15b and the caulking ring 17b use an electrically stable material as the material of the positive electrode 2. For example, it is preferable to use aluminum or the like. Also, the input / output extraction lead 15a
The caulking ring 17b uses an electrically stable material as the negative electrode 3 material. For example, it is preferable to use nickel or copper. The short-circuit and heat radiation electrode 7 and the discharge load lead are made of a material having resistance to electrolyte, conductivity and heat conductivity. For example, it is preferable to use copper, nickel, aluminum, or the like. In addition, these members may have a resistance component so that the members can release energy when the safety mechanism operates. Further, these members have an effect of dispersing the generated heat. In addition,
The discharge load lead is connected to the center of the discharge load diameter. The size of the discharge load 9 is within 1/5 of the total height of the battery, one or more of which are provided on the battery outer can 5 and coated with a material having heat conductivity, heat resistance and electrolyte resistance. For example, it is preferable to use a hermetic resistor sealed with an insulating material such as glass or ceramic.

Next, the configuration of the nonaqueous electrolyte secondary battery according to Embodiment 2 of the present invention will be described with reference to FIGS. 6 (a) and 6 (b). FIG. 6A is a cross-sectional view of the non-aqueous electrolyte secondary battery according to the second embodiment of the present invention shown in FIG. FIG.
6B is a cross-sectional view of the non-aqueous electrolyte secondary battery according to Embodiment 2 of the present invention shown in FIG. 5 taken along line BB ′.

The non-aqueous electrolyte secondary battery shown in FIG. 6A has a discharge load, a short-circuit and heat dissipation electrode, a core 4, a separator 1, a negative electrode 3, a positive electrode 2, and a battery can 5 from the inside. It is composed of The discharge load 9 is in contact with the outer peripheral portion of the discharge load 9 so as not to short-circuit and electrically short-circuit the electrode 7 for heat radiation. With such a configuration, the discharge load 9
Is released to the outside through the inner wall of the battery outer can 5. The non-aqueous electrolyte secondary battery shown in FIG. 6B has a short-circuit terminal 29, a discharge load lead guide 12, a short-circuit and heat radiation electrode 7, a core 4, a separator 1, a negative electrode 3, and a positive electrode from the inside. 2 and a battery outer can 5. The discharge load 9 is in contact with the outer peripheral portion of the discharge load 9 so as not to short-circuit and electrically short-circuit the electrode 7 for heat radiation. With this configuration, heat generated by the discharge load is radiated to the outside through the inner wall of the battery outer can 5. The short-circuit terminal is insulated from the short-circuit and heat-dissipating electrodes by the discharge load lead guide.

Next, a safety mechanism of the nonaqueous electrolyte secondary battery according to Embodiment 2 of the present invention will be described with reference to the drawings. FIG. 7A is a schematic diagram illustrating the non-aqueous electrolyte secondary battery according to Embodiment 2 of the present invention when the safety mechanism is not operating. FIG. 7 (b)
FIG. 7 is a schematic diagram showing a non-aqueous electrolyte secondary battery according to Embodiment 2 of the present invention when a safety mechanism is operating. FIG. 7 (c) is a schematic diagram illustrating a deformation operation of the battery outer can 5 during the safety mechanism operation of the nonaqueous electrolyte secondary battery according to Embodiment 2 of the present invention.

Referring to FIG. 7A, the core 4
Inside, the discharge load 9, the discharge load lead 11b, the discharge load lead guide 12, the short-circuit and heat radiation electrode 7, and the short-circuit terminal 29 are accommodated. When the safety mechanism is not operating, the discharge load lead 11 b is insulated from the short-circuit and heat radiation electrode 7 by the discharge load lead guide 12. The short-circuit terminal 12 is electrically connected to the short-circuit and heat-dissipating electrode 7, and is insulated from the discharge load lead 11b.

Further, as shown in FIG. 7C, when the safety mechanism is not operating, the can bottom 8 of the battery outer can 5 is forcibly deformed. As shown in FIG. 7B, the short-circuit terminal 29 is moved to the discharge load lead 11b side in a state where the short-circuit terminal 29 is electrically connected to the inside of the short-circuit and heat-dissipating electrode 7, and is electrically short-circuited. As a result, an electric path is formed and energy is output to the discharge load.

Regarding the operation of the safety mechanism, after attaching the temperature sensor 28 to the battery, the battery outer can 5 is moved in the direction of the safety mechanism operating stress 27 by the safety mechanism operating jig 26 having a round bar at the tip. The can bottom 8 is crushed so that the bottom 8 of the battery outer can 5 contacts the core 4. Thus, the discharge to the discharge load 9 is started. After the start of heat radiation, the temperature sensor 28 monitors and confirms that the temperature has risen.

Further, when a convex portion or the like for pushing is provided on the can bottom portion 8 and the convex portion is pushed in, the pushing amount can be visually confirmed. At this time, the distance between the short-circuit and heat radiation electrode 7 and the short-circuit terminal 29 is determined by the convex portion of the short-circuit terminal 29 on the can bottom portion 8 side, that is, the bottom end 13 of the can bottom portion 8 of the battery outer can 5 and the can bottom portion 8. It is desirable that the gap is substantially the same as the gap to be formed. The pushing amount for activating the safety device is limited to a position where the bottom of the can contacts the core 4 in order to avoid the same state as in the crush test.

When the discharge load lead is not provided, the discharge load and the discharge load lead can be held by fitting or adhering the discharge load to the inner diameter of the conductive member. Further, the short-circuit terminal can be held by fitting a part of the short-circuit terminal to the inner diameter of the conductive member. In addition, as long as an electric path is formed between the discharge load lead and the battery element as a result of plastic deformation of the battery outer can, the discharge load lead does not need to be connected to the positive electrode and the negative electrode.

Next, a method of manufacturing the nonaqueous electrolyte secondary battery according to Embodiment 2 of the present invention will be described below. (1) An electrode for short-circuit and heat dissipation is inserted into the core and joined to the inner wall of the core. (2) A part of the positive electrode active material and the negative electrode active material of the band-shaped positive electrode and the band-shaped negative electrode is removed. Alternatively, intermittent coating is performed to provide a portion where the positive electrode foil and the negative electrode foil are exposed. Next, an input / output extraction lead is joined to a portion where the positive electrode foil and the negative electrode foil are exposed, and a laminated body laminated around a core via a separator is wound around the core to form a battery element. (3) An insulating ring is attached to the end face of the battery element on the positive electrode side and the negative electrode side, and the input / output extraction leads of the positive electrode and the negative electrode are protruded from the openings of both insulating rings. Join mechanically. (4) An input / output extraction lead mechanically joined by a caulking ring after the battery element is housed in the battery outer can,
The conductive path is formed by joining the short-circuit and heat radiation electrode leads to the bottom of the can. It is desirable to set a large bonding area for bonding to the can bottom. The joining is performed using resistance welding, ultrasonic welding, or laser welding. (5) For the discharge load lead and short-circuit terminal of the discharge load,
The discharge load lead guide is fixed at a fixed interval and installed in the core. (6) Discharge load leads provided in such a manner as to protrude from the header side of the input / output extraction lead and the inside of the core are mechanically joined by a caulking ring, and the upper part of the battery outer can is grooved (grooved) to form a battery. A step is formed on the inner wall. (7) The discharge load lead is joined to the header.
It is desirable to set a large joint area for joining with the header portion. The bonding is performed by using resistance bonding, ultrasonic bonding, laser bonding, or the like. (8) After injecting the electrolytic solution, the header is caulked with a battery outer can via a gasket to seal the battery.

The non-aqueous electrolyte secondary battery according to the second embodiment of the present invention described above is an example in which the battery outer can is used as the negative electrode. It may be. In this case, the positive electrode and the negative electrode are reversed. When the discharge load lead is not provided, the discharge load and the discharge load lead can be held by fitting or adhering the discharge load to the inner diameter of the conductive member. Further, the short-circuit terminal can be held by fitting a part of the short-circuit terminal to the inner diameter of the conductive member. In addition, as long as an electric path is formed between the discharge load lead and the battery element as a result of plastic deformation of the battery outer can, the discharge load lead does not need to be connected to the positive electrode and the negative electrode.

[0059]

In a battery provided with a load for energy release in the battery outer can 5, when the battery element and the welding spot 24a and / or the welding spot 24b are cut off due to vibration or the like, there is a problem in the circuit or the like. Then, when the safety mechanism of the header section is activated, the battery element is forcibly deformed, so that the battery element is short-circuited to the energy release load provided inside the battery outer can 5 and the energy is safely released. Can be done. As a result, the battery can be in a safe state. Further, since large-scale equipment is not required, there is an advantage of reducing costs.

[0060]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a non-aqueous electrolyte secondary battery according to Embodiment 1 of the present invention.

FIG. 2 is a schematic diagram showing battery elements of the non-aqueous electrolyte secondary battery according to Embodiment 1 of the present invention.

3A is a cross-sectional view of the non-aqueous electrolyte secondary battery according to the first embodiment of the present invention, taken along line AA ′. FIG. 3B is a cross-sectional view of the non-aqueous electrolyte secondary battery according to the first embodiment of the present invention. B 'sectional view

FIG. 4 (a) is a schematic view showing a non-aqueous electrolyte secondary battery when the safety mechanism is not operating according to the first embodiment of the present invention. (B) Non-aqueous water when the safety mechanism is operating according to the first embodiment of the present invention. Schematic diagram showing the electrolyte secondary battery (c) Schematic diagram showing the deformation operation of the battery outer can in the nonaqueous electrolyte secondary battery during the operation of the safety mechanism according to the first embodiment of the present invention.

FIG. 5 is a sectional view showing a nonaqueous electrolyte secondary battery according to Embodiment 2 of the present invention.

6 (a) is a cross-sectional view of the non-aqueous electrolyte secondary battery taken along the line AA ′ shown in FIG. 5 of the second embodiment of the present invention. (B) FIG. BB 'sectional view of the non-aqueous electrolyte secondary battery

FIG. 7 (a) is a schematic diagram showing a non-aqueous electrolyte secondary battery according to Embodiment 2 of the present invention when the safety mechanism is not operating; and (b) a non-aqueous electrolyte secondary battery according to Embodiment 2 of the present invention. (C) A schematic view showing the deformation operation of the battery outer can during the operation of the safety mechanism of the nonaqueous electrolyte secondary battery according to Embodiment 2 of the present invention.

FIG. 8 is a sectional view showing a conventional non-aqueous electrolyte secondary battery.

FIG. 9 (a) is a view showing an example of a constituent member of a header portion of the present invention and a conventional non-aqueous electrolyte secondary battery. (B) A safety mechanism of the present invention and a conventional non-aqueous electrolyte secondary battery are described. Cross section

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Separator 2 Positive electrode 3 Negative electrode 4 Core 5 Battery outer can 6 Conductive member 7 Short circuit call heat dissipation electrode 8 Can bottom 9 Discharge load 10 Header 11a Discharge load lead 11b Discharge load lead 12 Discharge load lead guide 13 Bottom end surface 14 Insulation ring 15a Input / output extraction lead 15b Input / output extraction lead 16 Opening 17a Caulking ring 17b Caulking ring 18 Top end surface 19 Weld plate 20 Cap 21 Nickel ring 22 Rupture disk 23 Gasket 24a External extraction welding point 24b External extraction welding Point 25 External side wall 26 Safety mechanism operation jig 27 Safety mechanism operation stress direction 28 Temperature sensor 29 Short-circuit terminal 30 Header assembly side view 31 Header assembly side view 32 Header assembly side view

Continued on the front page (72) Inventor Takayuki Inoi 5-7-1 Shiba, Minato-ku, Tokyo Inside the NEC Corporation (72) Inventor Koichi Zama 5-7-1 Shiba, Minato-ku, Tokyo NEC Corporation In-house F-term (reference) 5H029 AJ02 AJ12 AM01 BJ02 BJ04 BJ14 BJ27 CJ07 CJ16 DJ02 DJ04 DJ05

Claims (8)

[Claims] 1. A battery element comprising a positive electrode current collector and a negative electrode current collector having a positive electrode active material layer and a negative electrode active material layer laminated with a separator interposed therebetween, wound around a core in a battery outer can. In a non-aqueous electrolyte secondary battery in which such a battery element is electrically connected to a positive electrode and a negative electrode, the battery element has a conductive member connected to a part of the inner wall of the core, A non-aqueous device having a safety mechanism in which a load for discharging energy is provided inside and a conductive member is connected to one of a positive electrode and a negative electrode via a lead connected to the conductive member. Electrolyte secondary battery. 2. The power supply according to claim 1, wherein the load for discharging energy comprises a discharge load and a discharge load lead extending from the discharge load in a positive electrode direction and a negative electrode direction. Non-aqueous electrolyte secondary battery. 3. A short-circuit terminal connected to an extension electrode of a discharge load lead extending in one of a positive electrode direction and a negative electrode direction among discharge load leads extending in a positive electrode direction and a negative electrode direction. The non-aqueous electrolyte secondary battery according to claim 1 or 2, wherein the non-aqueous electrolyte secondary battery is extended with a predetermined interval provided in a direction in which the discharge load lead extends. 4. An insulative discharge load lead guide is provided on the inner peripheral edge of the conductive member so as to contact the discharge load lead. Non-aqueous electrolyte secondary battery. 5. The non-aqueous electrolyte secondary battery according to claim 4, wherein a mark is provided on an outer side wall of the battery outer can in correspondence with a position where the discharge load lead guide is located. 6. A mark is provided on an outer side wall of a battery outer can corresponding to a portion where a discharge load lead provided inside a conductive member and an inner wall of the conductive member face each other. The non-aqueous electrolyte secondary battery according to claim 1. 7. The non-aqueous electrolyte secondary battery according to claim 3, wherein a mark is provided at a predetermined portion of the battery outer can where the electrode to which the short-circuit terminal is connected is located. 8. The non-aqueous electrolyte secondary battery according to claim 6, wherein the mark is a projection.