JP2009231243A - Battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery capable of sufficiently showing a function for preventing adverse effects to the outside at the time of excessive temperature rise. <P>SOLUTION: The battery has a PTC element (heat-sensitivity restriction element) 25 in a current conduction pathway from a battery power generation element 6 to a negative electrode terminal (output terminal) 2. Electric resistance of the PTC element 25 is rapidly increased at the time of excessive temperature rise, and output of current is blocked by restraining current conduction from the battery power generation element 6 to the negative electrode terminal 2. The battery has a bypass terminal 1 connected with the battery power generation element 6 without passing through the PTC element 25. High-voltage is applied to the battery power generation element 6 via the bypass terminal 1 without applying voltage to the PTC element 25 at a process of an inspection of insulation. The PTC element 25 does not receive any damage because high-voltage is not applied, and the battery can sufficiently show the function for preventing wrong influence to the outside by blocking the output of current at the time of excessive temperature rise. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a battery, and more particularly, to a battery having a built-in mechanism for preventing energization to the outside when the inside of the battery abnormally generates heat.

  Conventionally, various batteries such as lithium ion secondary batteries have been used as power sources for various electronic devices. As electronic devices become smaller and lighter, batteries are also required to be smaller and lighter. At the same time, the battery is required to have a high level of safety that does not adversely affect the electronic device even when the inside of the battery abnormally generates heat due to a short circuit or the like. Japanese Patent Application Laid-Open No. 2004-133867 discloses a technology that achieves both a reduction in size and weight of a battery and ensuring safety against heat generation inside by incorporating a mechanism in the battery to cut off the external power supply when the inside of the battery generates heat. Is disclosed.

  FIG. 6 is a perspective view showing the appearance of a conventional battery. The external appearance of the battery housing the battery power generation element is composed of a battery case 71 having a flat rectangular container shape with one end face open, and a lid part 72 that closes the opening of the battery case 71. The battery case 71 and the lid 72 are made of a conductive material such as aluminum. The lid portion 72 is formed in a rectangular flat plate shape, and is provided with a negative terminal 74 at a substantially central position on the outside, and a safety valve 75 for releasing the internal gas when the internal pressure increases. It has been. The battery case 71 and the lid part 72 are positive electrodes, and a positive electrode terminal 73 welded to the battery case 71 is provided at the other end opposite to the opening of the battery case 71.

  FIG. 7 is a partial cross-sectional view showing the internal structure of a conventional battery. A battery power generation element 81 made of a positive electrode material, a negative electrode material, a separator, and the like is accommodated in the battery case 71. A positive electrode current collector plate 82 and a negative electrode current collector plate 83 are provided at one end of the battery power generation element 81, and the battery power generation element 81 includes the positive electrode current collector plate 82 and the negative electrode current collector plate 83 on the opening side of the battery case 71. It is stored in the battery case 71 toward. The positive current collector plate 82 is connected to a positive electrode connection piece 731 that is electrically connected to the lid portion 72, and the negative current collector plate 83 is connected to a negative electrode current collector plate 731 that is electrically connected to the negative electrode terminal 74. 741 is connected.

  FIG. 8 is a cross-sectional view showing a configuration of a conventional lid portion 72. FIG. 8A shows a cross section of the lid portion 72 in the long side direction. The lid portion 72 that is a positive electrode is electrically connected to the positive electrode current collector plate 82 via a positive electrode connection piece 731. Therefore, the positive electrode terminal 73 is electrically connected to the positive electrode current collector plate 82 through the battery case 71, the lid 72, and the positive electrode connection piece 731. The negative terminal 74 is provided so as to penetrate the lid portion 72 from the outside to the inside. A negative electrode terminal connection piece 742 is connected to a portion of the negative electrode terminal 74 penetrating inward of the lid portion 72. Further, a holding portion 744 that holds a PTC (Positive Temperature Coefficient) element 743 between a negative electrode terminal connection piece 742 and a negative electrode current collector plate connection piece 741 is provided inside the lid portion 72. FIG. 8B shows a cross section in the short side direction of the portion where the holding portion 744 of the lid portion 72 is provided. FIG. 9 is a perspective view showing a conventional holding unit 744. The holding portion 744 has a substantially rectangular plate shape, and has a configuration in which the PTC element 743 is sandwiched between the negative electrode terminal connection piece 742 and the negative electrode current collector plate connection piece 741 and covered with an insulating resin.

  With the above configuration, the negative electrode terminal 74 is connected to the negative electrode current collector plate 83 via the negative electrode terminal connection piece 742, the PTC element 743, and the negative electrode current collector plate connection piece 741. The PTC element 743 is a resistance element whose electrical resistance increases rapidly at a predetermined temperature or higher. When the inside of the battery generates heat and the temperature of the PTC element 743 exceeds a predetermined temperature, the electrical resistance of the PTC element 743 increases abruptly, and energization between the negative electrode current collector plate 83 and the negative electrode terminal 74 is greatly increased. Limited to Therefore, when the inside of the battery generates heat, the current output from the battery to the outside is substantially interrupted.

FIG. 10 is a cross-sectional view showing another configuration example of the conventional lid 72. 10A shows a cross section in the long side direction of the lid portion 72, and FIG. 10B shows a cross section in the short side direction of the portion of the lid portion 72 where the holding portion 744 is provided. In the configuration example illustrated in FIG. 10, the holding unit 744 includes a thermal protector 745 made of bimetal as a protection element, and the thermal protector 745 is connected to the negative electrode terminal 74. The thermal protector 745 is in contact with the negative electrode current collector plate connection piece 741 when the temperature is normal temperature, and is separated from the negative electrode current collector plate connection piece 741 when the temperature is higher than a predetermined temperature. The negative electrode terminal 74 is connected to the negative electrode current collector plate 83 via a thermal protector 745 and a negative electrode current collector plate connection piece 741. In this configuration, when the inside of the battery generates heat and the temperature of the thermal protector 745 reaches a predetermined temperature or more, the thermal protector 745 is separated from the negative current collector connection piece 741, and the negative current collector 83 and the negative terminal 74 are separated. And electrically disconnected. Therefore, when the inside of the battery generates heat, current output from the battery to the outside is cut off.
JP 2003-187785 A

  The process of manufacturing the battery includes an insulation inspection process in which a high voltage of about 500 V is applied between the positive electrode terminal 73 and the negative electrode terminal 74 in order to confirm the presence or absence of a short circuit between the positive electrode and the negative electrode. In this insulation inspection process, a high voltage is also applied to the heat-sensitive limiting element that is the PTC element 743 or the thermal protector 745. However, the withstand voltage of the heat-sensitive limiting element is usually about 20 to 30 V, which is lower than the voltage applied in the insulation test. For this reason, the heat-sensitive limiting element built in the battery is damaged by a high voltage during the insulation test, and the original function is impaired. Therefore, the conventional battery has a problem that the function of limiting the current output from the battery to the outside when the inside of the battery generates heat is insufficient.

  The present invention has been made in view of such circumstances. The object of the present invention is to generate a voltage at the time of an insulation test by adopting a configuration that does not require a voltage to be applied to the heat-sensitive limiting element at the time of the insulation test. It is an object of the present invention to provide a battery capable of sufficiently exhibiting the function of interrupting the external power supply at the time of excessive temperature rise by suppressing breakage of the heat-sensitive limiting element.

  The battery according to the present invention is a battery comprising: a battery power generation element that outputs current; and a heat-sensitive limiting element that limits current output from the battery power generation element to the outside when the temperature is equal to or higher than a predetermined temperature. A current path for applying a voltage to the battery power generation element from the outside without passing through a heat-sensitive limiting element is provided.

  In the present invention, a battery including a thermal limiting element that limits current output from the battery power generating element that outputs current to the outside at the time of overheating applies voltage to the battery power generating element without going through the thermal limiting element. It is equipped with a current path. In the insulation inspection process, by using the current path, a high voltage can be applied to the battery power generation element without applying a voltage to the heat-sensitive limiting element.

  The battery according to the present invention electrically connects a battery power generation element that outputs current, an output terminal for outputting current from the battery power generation element to the outside, and an electrode between the electrode of the battery power generation element and the output terminal. In a battery comprising a thermal limiting element that is connected and limits energization between the electrode of the battery power generation element and the output terminal when the temperature is equal to or higher than a predetermined temperature, the battery does not pass through the thermal limiting element And a bypass terminal electrically connected to the electrode of the battery power generation element.

  In the present invention, a battery including a battery power generation element that outputs current, an output terminal, and a heat-sensitive limiting element that limits energization between the battery power generation element and the output terminal at an excessive temperature rise is caused to pass through the heat-sensitive limiting element. And a bypass terminal connected to the electrode of the battery power generation element. In the insulation inspection step, a high voltage can be applied to the battery power generation element via the bypass terminal without applying a voltage to the heat-sensitive limiting element.

  A battery according to the present invention includes a battery power generation element that outputs a current, a battery case that houses the battery power generation element and is partially open, a lid that closes the opening of the battery case, and the lid An output terminal for outputting a current from the battery power generation element to the outside, a conductive connection piece electrically connected to an electrode of the battery power generation element, and an inner side of the lid portion A thermal limiting element that is electrically connected between the connection piece and the output terminal and limits energization between the connection piece and the output terminal when the temperature is equal to or higher than a predetermined temperature; A bypass terminal provided on the outside of the lid portion and spaced apart from the heat-sensitive limiting element, wherein the connection piece is also electrically connected to the bypass terminal. .

  In the present invention, a battery power generation element that outputs current, a battery case, a lid that closes the opening of the battery case, an output terminal provided on the lid, and a connection piece that is connected to an electrode of the battery power generation element A battery including a heat-sensitive limiting element that limits energization between the connection piece and the output terminal at an excessive temperature rise includes a bypass terminal connected to the connection piece. In the insulation inspection process, a high voltage can be applied to the battery power generation element via the bypass terminal and the connection piece without applying a voltage to the heat-sensitive limiting element.

  The battery according to the present invention is characterized in that the heat-sensitive limiting element is a resistance element whose electrical resistance increases to a predetermined value or more when the temperature becomes a predetermined temperature or higher.

  In the present invention, the heat-sensitive limiting element is a resistance element, and when the temperature exceeds a predetermined temperature, the electrical resistance of the resistance element is such that the current passed through the resistance element is sufficiently small. The current output via the resistance element is greatly limited.

  The battery according to the present invention is characterized in that the heat-sensitive limiting element is an element that physically disconnects when a temperature equal to or higher than a predetermined temperature.

  Further, in the present invention, when the temperature limit element becomes equal to or higher than a predetermined temperature, the electrical connection is physically disconnected, and the current output via the heat limit element is cut off.

  In the present invention, since a high voltage can be applied to the battery power generation element without applying a voltage to the heat-sensitive limiting element in the insulation inspection process, the heat-sensitive limiting element is damaged by a high voltage during the insulation inspection. Will not be affected and will not impair the original function. Therefore, the battery of the present invention can sufficiently exhibit the function of limiting the output of current at a temperature equal to or higher than a predetermined temperature to prevent adverse effects on the outside, and the user can safely perform the battery of the present invention. The present invention has an excellent effect, such as being able to utilize.

Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof.
(Embodiment 1)
FIG. 1 is a perspective view showing the appearance of the battery of the present invention. The battery of the present invention includes a battery case 51 having a flat rectangular container shape with one end face opened, and a lid 52 that closes the opening of the battery case 51. The battery case 51 and the lid 52 are made of a conductive material such as aluminum, and the lid 52 closes the battery case 51 by, for example, welding to the battery case 51. The lid portion 52 is formed in a rectangular flat plate shape, and is provided with a negative electrode terminal (output terminal) 2 at a substantially central position on the outside. Further, when the internal pressure increases, the internal gas is released. A safety valve 4 is provided. The battery case 51 and the lid 52 are positive electrodes, and the positive electrode terminal 3 welded to the battery case 51 is provided at the other end opposite to the opening of the battery case 51. For example, the positive electrode terminal 3 is made of a clad material of aluminum and nickel, and the positive electrode terminal 3 is formed by attaching the aluminum surface of the clad material to the other end of the battery case 51 by ultrasonic welding, laser welding or resistance welding. The Further, a bypass terminal 1 described later is provided at a position between the negative electrode terminal 2 and the safety valve 4.

  FIG. 2 is a partial cross-sectional view showing the internal structure of the battery according to Embodiment 1. In the battery case 51, a battery power generation element 6 which is a main body for outputting a current is accommodated. The battery power generation element 6 has a flat spiral shape formed by winding a strip-shaped positive electrode material and a negative electrode material through a separator. At one end of the battery power generation element 6, a positive electrode current collector plate 61 connected to the positive electrode material and a negative electrode current collector plate (electrode) 62 connected to the negative electrode material are provided at a predetermined interval. The battery power generation element 6 is housed in the battery case 51 with the positive electrode current collecting plate 61 and the negative electrode current collecting plate 62 facing the opening side of the battery case 51. The positive electrode current collector plate 61 is connected to the positive electrode connection piece 31 electrically connected to the lid portion 52, and the negative electrode current collector plate 62 is connected to the negative electrode terminal 2. (Connecting piece) 23 is connected.

  FIG. 3 is a cross-sectional view showing the configuration of the lid 52 according to the first embodiment. The positive electrode connection piece 31 is connected to the inside of the lid portion 52. The positive current collecting plate 61 is electrically connected to the positive electrode terminal 3 via the positive electrode connecting piece 31, the lid portion 52, and the battery case 51 by being connected to the positive electrode connecting piece 31 connected to the lid portion 52. It will be. In addition, the safety valve 4 is obtained by forming a part of the lid 52 into an elliptical thin film by pressing. A through hole 521 is formed substantially at the center of the lid 52, and the gasket 21 made of an insulating material is fitted into the through hole 521, and the negative electrode terminal 2 is attached to the gasket 21. The negative electrode terminal 2 penetrates the lid portion 52, and the tip 20 of the negative electrode terminal 2 protrudes from the lid portion 52 and the gasket 21 inside the lid portion 52. The gasket 21 is sandwiched between the negative electrode terminal 2 and the lid portion 52, and the negative electrode terminal 2 is insulated from the lid portion 52. Further, a holding portion 24 that holds a PTC element (heat-sensitive limiting element) 25 inside is attached to the inside of the lid portion 52.

  FIG. 4 is a perspective view of the holding unit 24 as seen from the inside of the battery. The holding portion 24 has a substantially rectangular plate shape, and sandwiches the PTC element 25 between the negative electrode terminal connection piece 22 connected to the negative electrode terminal 2 and the negative electrode current collector plate connection piece 23 connected to the negative electrode current collector plate 62. These are covered with an insulating material such as resin. The PTC element 25 has a rectangular plate shape, and the negative terminal connecting piece 22 has a rectangular plate shape having a width substantially equal to the width of the PTC element 25 and longer than the long side of the PTC element 25. The short side of the negative electrode terminal connecting piece 22 is aligned with the short side of the PTC element 25 so that the surfaces of the negative electrode terminal connecting piece 22 and the PTC element 25 are in close contact with each other. The surface of the piece 22 is covered with a holding part 24. The holding portion 24 is attached to the inside of the lid portion 52 so that the surface of the holding portion 24 that covers the negative electrode terminal connection piece 22 is in close contact with the inside of the lid portion 52. The negative electrode terminal connection piece 22 extends from a portion in close contact with the PTC element 25, and through holes are formed in the holding portion 24 and the negative electrode terminal connection piece 22 according to the position of the through hole 521 through which the negative electrode terminal 2 passes. ing. The negative electrode terminal 2 passes through the through holes of the holding portion 24 and the negative electrode terminal connecting piece 22, and the holding portion 24 and the negative electrode terminal connecting piece 22 are covered with the lid portion by caulking the tip 20 of the negative electrode terminal 2 to the negative electrode terminal connecting piece 22. The negative electrode terminal connecting piece 22 is electrically connected to the negative electrode terminal 2.

  The negative electrode current collector plate connection piece 23 has a substantially L-shaped cross section, one side is arranged substantially parallel to the lid portion 52, and the other piece is bent in a direction away from the lid portion 52 substantially perpendicular to the lid portion 52. Projecting from the holding portion 24 and connected to the negative electrode current collector plate 62. One side of the negative electrode current collector plate connection piece 23 has a rectangular plate shape having a width substantially equal to the width of the PTC element 25 and longer than the long side of the PTC element 25. The surface of the PTC element 25 opposite to the surface in close contact with the negative electrode terminal connection piece 22 is in close contact with the surface of one side of the negative electrode current collector plate connection piece 23, and the negative electrode current collector plate connection opposite to the surface in contact with the PTC element 25 The surface of one side of the piece 23 is covered with a holding part 24. In this manner, the negative electrode terminal connection piece 22 and the negative electrode current collector plate connection piece 23 sandwich the PTC element 25 and are electrically connected via the PTC element 25. The negative terminal connecting piece 22 and the negative current collecting plate connecting piece 23 are not directly connected. When the PTC element 25 restricts energization, the energization between them is restricted. With the above configuration, the battery power generation element 6 is electrically connected to the negative electrode terminal 2 via the negative electrode current collector plate 62, the negative electrode current collector plate connection piece 23, the PTC element 25, and the negative electrode terminal connection piece 22.

  Furthermore, one side of the negative electrode current collector connection piece 23 extends in a direction opposite to the direction in which the negative electrode terminal connection piece 22 extends. A through hole 522 is formed at a position between the negative electrode terminal 2 and the safety valve 4 of the lid portion 52, and the holding portion 24 is fitted into the through hole 522 and protrudes from the inside of the lid portion 52 to the outside. A cylindrical protruding portion 241 is formed. One side of the negative electrode current collector connecting piece 23 extends to a position where the protruding portion 241 protrudes, and a through hole is formed in accordance with the position of the inner hole of the protruding portion 241. The bypass terminal 1 is attached to the inner hole of the protruding portion 241, passes through a through hole on one side of the negative electrode current collector plate connection piece 23, and caulks the tip 10 of the bypass terminal 1 to the negative electrode current collector plate connection piece 23. The negative electrode current collector plate connection piece 23 is electrically connected to the bypass terminal 1. Note that the holding portion 24 may not include the protruding portion 241, and an insulating material gasket may be fitted in the through hole 522 instead of the protruding portion 241.

  By connecting the negative current collector connecting piece 23 to the bypass terminal 1, the negative current collector 62 of the battery power generation element 6 is connected to the bypass terminal 1 via the negative current collector connecting piece 23. The bypass terminal 1 is separated from the PTC element 25 and is electrically connected to the negative electrode current collector plate 62 without passing through the PTC element 25. The energization path through the bypass terminal 1, the negative current collector connection piece 23, and the negative current collector 62 is an energization path for applying a voltage to the battery power generation element 6 without passing through the PTC element 25.

  Next, the operation of the battery of the present invention having the above configuration will be described. In a state of being shipped as a product and used as a current generation source, the negative electrode terminal 2 and the positive electrode terminal 3 are connected to an external circuit, and the battery is supplied from the battery power generation element 6 with the negative electrode terminal 2 and the positive electrode terminal 3 as output terminals. Output current. The PTC element 25 is a resistance element whose electrical resistance increases rapidly above a specific temperature. When the battery power generation element 6 abnormally generates heat due to a short circuit or the like in the battery power generation element 6, the temperature of the PTC element 25 increases as the battery power generation element 6 generates heat. The PTC element 25 is configured to have a sufficiently high electric resistance at a predetermined temperature that is equal to or higher than a predetermined temperature that is the upper limit of the temperature range in which the battery operates safely. At a temperature equal to or higher than a predetermined temperature, the electric resistance of the PTC element 25 becomes an electric resistance equal to or higher than a predetermined value such that a current passing through the PTC element 25 becomes a sufficiently small current not to operate an external circuit. When the temperature of the PTC element 25 continues to rise and exceeds a predetermined temperature, the electrical resistance of the PTC element 25 increases to a predetermined value or more, and almost no current flows through the PTC element 25. At this time, the current almost does not flow between the negative electrode current collector plate connection piece 23 and the negative electrode terminal connection piece 22 connected via the PTC element 25, and energization between the battery power generation element 6 and the negative electrode terminal 2 is performed. Almost blocked. Therefore, in the case of an excessive temperature rise in which the battery power generation element 6 abnormally generates heat, the PTC element 25 limits the output of current so that the current output is substantially interrupted, so that the battery of the present invention has an adverse effect on external circuits. Will not affect. By providing the PTC element 25 inside the battery, the current output is quickly interrupted against the heat generated by the battery power generation element 6, so that the safety of the battery is high and the battery can be miniaturized.

  Moreover, in the process of insulation inspection in the process of manufacturing the battery of the present invention, a high voltage of about 500 V is applied from the outside between the positive electrode terminal 3 and the bypass terminal 1 of the battery of the present invention. A high voltage is applied to the battery power generation element 6 via the bypass terminal 1 and the negative electrode current collector plate connection piece 23. Since the PTC element 25 is not interposed in the energization path to which a high voltage is applied in the insulation inspection process, a high voltage is not applied to the PTC element 25 in the insulation inspection process. For this reason, the PTC element 25 is not damaged by a high voltage during the insulation test, and the original function is not impaired. Therefore, the battery of the present invention can sufficiently exhibit the function of limiting the output of current at the time of excessive temperature rise and preventing adverse effects to the outside, and the user can safely use the battery of the present invention. be able to. In the battery of the present invention shipped as a product, the bypass terminal 1 is covered with an insulating cover, and the bypass terminal 1 does not hinder the use of the battery.

(Embodiment 2)
In the second embodiment, not the PTC element but the element that physically cuts off the electrical connection may be used as the heat-sensitive limiting element in the present invention. FIG. 5 is a cross-sectional view showing the configuration of the lid 52 according to the second embodiment. The battery according to the second embodiment includes a thermal protector 26 instead of the negative electrode terminal connecting piece 22 and the PTC element in the first embodiment.

  The thermal protector 26 is a bimetal formed in a bent flat plate shape. A through hole is formed in a part of the thermal protector 26, the negative electrode terminal 2 passes through the through hole of the thermal protector 26, and the tip 20 of the negative electrode terminal 2 is caulked to the thermal protector 26, thereby The thermal protector 26 is fixed to the lid portion 52, and the thermal protector 26 is electrically connected to the negative electrode terminal 2. One end of the thermal protector 26 is in contact with the negative electrode current collector plate connection piece 23. Other configurations of the battery according to the second embodiment are the same as those of the first embodiment, and the corresponding parts are denoted by the same reference numerals and description thereof is omitted. That is, although not shown in FIG. 5, the battery power generation element 6 is electrically connected to the negative electrode terminal 2 through the negative electrode current collector plate 62, the negative electrode current collector plate connection piece 23, and the thermal protector 26.

  The thermal protector 26 is configured such that the curvature of the bent portion changes as the temperature rises, and one end is separated from the negative electrode current collector plate connection piece 23 at a temperature equal to or higher than a predetermined temperature. When the battery power generation element 6 does not generate heat and the temperature of the thermal protector 26 is lower than a predetermined temperature, one end of the thermal protector 26 comes into contact with the negative current collector connection piece 23, and the battery power generation element 6 and the negative electrode terminal 2 are connected. The electrical connection between them is maintained, and the current from the battery power generation element 6 is output to the outside. When the battery power generation element 6 generates heat abnormally, the temperature of the thermal protector 26 increases as the battery power generation element 6 generates heat. When the temperature of the thermal protector 26 continues to rise and becomes equal to or higher than a predetermined temperature, one end of the thermal protector 26 is separated from the negative electrode current collector plate connection piece 23, and the electric power between the battery power generation element 6 and the negative electrode terminal 2 is separated. The physical connection is physically disconnected and the current output is interrupted. Therefore, in the present embodiment, when the battery power generation element 6 overheats abnormally, the thermal protector 26 limits the current output so that the current output is interrupted, and the battery of the present invention is Does not adversely affect external circuits.

  In addition, the insulation inspection process in the process of manufacturing the battery of the present invention is performed by applying a high voltage from the outside between the positive terminal 3 and the bypass terminal 1 in the present embodiment. The thermal protector 26 is not applied with a high voltage during an insulation test, is not damaged by the high voltage, and does not impair the original function. Therefore, also in the present embodiment, the battery of the present invention can sufficiently exert the function of cutting off the output of current at the time of excessive temperature rise and preventing adverse effects to the outside, and the user can safely The battery of the present invention can be used.

  In the present embodiment, an example in which the thermal protector 26 is used as the heat-sensitive limiting element has been described. However, the battery of the present invention may have a form using a fuse as the heat-sensitive limiting element. Even in a form using a fuse as the heat-sensitive limiting element, when the temperature becomes equal to or higher than a predetermined temperature, the electrical connection between the battery power generation element 6 and the negative electrode terminal 2 is physically disconnected. Therefore, even in this embodiment, the user can safely use the battery of the present invention.

  In the first and second embodiments, the negative electrode current collector plate connecting piece 23 is connected to both the heat-sensitive limiting element and the bypass terminal 1. However, the present invention is not limited to this, and the negative electrode The bypass terminal 1 may be connected to the negative electrode current collector plate 62 without the current collector plate connection piece 23 interposed therebetween. In Embodiments 1 and 2 described above, the negative electrode terminal 2 is electrically connected to the negative electrode current collector plate 62 of the battery power generation element 6 via the heat-sensitive limiting element. The battery case 51 and the lid 52 are used as negative electrodes, the positive terminal is disposed in the center of the lid 52, and the positive terminal is electrically connected to the positive current collector 61 of the battery power generation element 6 via the heat-sensitive limiting element. It may be in a form connected to. In Embodiments 1 and 2 described above, the shape of the battery is a flat rectangular shape, but the shape of the battery of the present invention is not limited to this, and may be other shapes such as a cylindrical shape.

  In addition, the present invention described in the first and second embodiments may have a configuration in which the bypass terminal 1 is connected to the electrode of the battery power generation element 6 without passing through the heat-sensitive limiting element. The material of the positive electrode material, the negative electrode material and the separator, the composition of the electrolytic solution, and the like are not limited. That is, the positive electrode material, the negative electrode material, and the separator material of the battery power generation element 6 and the composition of the electrolytic solution may be any. For example, the battery of the present invention may be various secondary batteries such as a lithium ion secondary battery or a nickel-hydrogen secondary battery, or various primary batteries such as an alkaline manganese dry battery.

It is a perspective view which shows the external appearance of the battery of this invention. 2 is a partial cross-sectional view showing the internal structure of the battery according to Embodiment 1. FIG. 3 is a cross-sectional view illustrating a configuration of a lid according to Embodiment 1. FIG. It is the perspective view which looked at the holding | maintenance part from the inner side of the battery. FIG. 6 is a cross-sectional view illustrating a configuration of a lid according to Embodiment 2. It is a perspective view which shows the external appearance of the conventional battery. It is a partial cross section figure which shows the internal structure of the conventional battery. It is sectional drawing which shows the structure of the conventional cover part. It is a perspective view which shows the conventional holding | maintenance part. It is sectional drawing which shows the other structural example of the conventional cover part.

Explanation of symbols

1 Bypass terminal 2 Negative terminal (output terminal)
22 Negative terminal connection piece 23 Negative current collector connection piece (connection piece)
24 holding part 25 PTC element (resistance element, heat-sensitive limiting element)
26 Thermal protector (thermal limit element)
51 Battery Case 52 Lid 6 Battery Power Generation Element 62 Negative Electrode Current Collector (Electrode)

Claims (5)

In a battery comprising: a battery power generation element that outputs current; and a heat-sensitive limiting element that limits current output from the battery power generation element to the outside when the temperature is equal to or higher than a predetermined temperature.
A battery comprising a current path for applying a voltage to the battery power generation element from the outside without going through the heat-sensitive limiting element. A battery power generation element that outputs a current, an output terminal for outputting the current from the battery power generation element to the outside, and an electrode electrically connected between the electrode of the battery power generation element and the output terminal; In a battery comprising a heat-sensitive limiting element that limits energization between the electrode of the battery power generation element and the output terminal when the temperature is equal to or higher than the temperature,
A battery comprising a bypass terminal electrically connected to an electrode of the battery power generation element without going through the heat-sensitive limiting element. A battery power generation element that outputs current, a battery case that houses the battery power generation element and is partially open, a lid that closes the opening of the battery case, and is provided outside the lid, An output terminal for outputting a current from the battery power generation element to the outside; a conductive connection piece electrically connected to an electrode of the battery power generation element; and the connection piece provided inside the lid portion. And a battery comprising a thermal limiting element that electrically connects between the output terminals and limits energization between the connection piece and the output terminal when the temperature is equal to or higher than a predetermined temperature.
Provided on the outer side of the lid, comprising a bypass terminal spaced from the heat-sensitive limiting element,
The battery is characterized in that the connection piece is also electrically connected to the bypass terminal.   The battery according to any one of claims 1 to 3, wherein the heat-sensitive limiting element is a resistance element whose electrical resistance increases to a predetermined value or more when a temperature equal to or higher than a predetermined temperature.   The battery according to any one of claims 1 to 3, wherein the heat-sensitive limiting element is an element that physically disconnects when a temperature equal to or higher than a predetermined temperature.

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