JP2008218234A - Battery, vehicle on which this battery is mounted, and battery-mounted equipment mounted with this battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery in which a gas formed in a power generating element can be discharged to the exterior of this power generating element in a battery in which a positive electrode plate and a negative electrode plate are wound around the winding shaft via a separator and which has the power generating element that has a mutually superposed shape while a part of a current collecting part is wound around, moreover provide a vehicle to mount such a battery, and provide a battery-mounting equipment to mount such a battery. <P>SOLUTION: An element battery 100 is each equipped with a power generating element 130 having a belt-like positive electrode plate 140, a negative electrode plate 170, and a separator 190. The positive electrode plate 140 has a belt-like positive electrode conductive member 141 including a positive electrode current collecting part 143 that does not carry positive electrode active material 148. The positive electrode current collecting part 143 has a plurality of positive electrode side ventilation holes 145H along the circumferential direction RT of wound-axis 130X dispersedly. These positive electrode side ventilation holes 145H compose one part of positive electrode side ventilation passage PP in which a separator inside site 191 is communicated with power generating element exterior 130S. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a battery, a vehicle equipped with the battery, and a battery-equipped device equipped with the battery.

  In recent years, various secondary batteries have been proposed as power sources for portable devices and portable devices, and as power sources for electric cars and hybrid cars. Some of the secondary batteries include an electrolytic solution and a power generation element obtained by winding a belt-like positive electrode plate and a negative electrode plate in a spiral shape with a belt-like separator interposed therebetween. Further, in such a power generation element, as the portion of the positive electrode plate that does not carry the positive electrode active material (positive electrode current collector) moves away from the separator in the axial direction along the winding axis, There is one that is collected in a bundled shape toward the head (for example, see Patent Document 1).

JP 2000-323106 A

  A sealed battery (battery) disclosed in Patent Document 1 is a wound electrode (power generation element) obtained by winding a belt-like positive electrode (positive electrode plate) and a negative electrode (negative electrode plate) through a belt-like separator. A bottomed cylindrical battery case that houses the mold electrode, and a disk-shaped battery lid (collecting terminal member) that closes the battery case. In this sealed battery, the wound electrode is housed in the battery case with the battery lid as the positive electrode terminal and the winding shaft along the axis of the battery case. A positive electrode current collector (positive electrode current collector), which is a part of the wound positive electrode and does not apply an active material (positive electrode active material), extends from the wound electrode toward the battery lid, and is formed at the center of the battery lid. The battery lid is electrically connected in a bundled form.

By the way, in the secondary battery, for example, a current having a large current value flows through the battery due to a short circuit or overcharge, and the temperature of the portion where the positive electrode plate and the negative electrode plate are wound via the separator in the power generation element rises. Then, the electrolytic solution may gasify in this part.
On the other hand, when the positive electrode current collector or the negative electrode current collector not coated with the negative electrode active material in the negative electrode plate, that is, the end portions of the current collector are overlapped with each other as in Patent Document 1, It becomes difficult to distribute the gas inside and outside the power generation element through the end in the axial direction.

Then, the gas generated in the power generation element tends to stay in the power generation element, particularly in the central portion in the axial direction of the power generation element, and this central portion expands toward the radially outer side of the winding shaft. This may cause battery damage such as cracks in each member in the power generation element.
Even when a safety valve that discharges the internal gas is provided in the battery case or the like, the gas stays in the power generation element, and the gas is released to the storage space in the battery case that stores the power generation element. Since this is not possible, the battery may expand without the safety valve functioning sufficiently, and similar problems may occur.

  The present invention has been made in view of the present situation, and is a form in which a positive electrode plate and a negative electrode plate are wound around a winding shaft via a separator, and a part of a current collector overlaps each other while being wound. It is an object of the present invention to provide a battery having a power generation element that can discharge gas generated in the power generation element to the outside of the power generation element. Moreover, it aims at providing the vehicle carrying such a battery and the battery mounting apparatus which mounts such a battery.

  The solution is a battery comprising an electrolytic solution and a power generation element formed by winding a belt-like positive electrode plate and a negative electrode plate around a winding axis via a belt-like separator, the positive electrode plate Is a positive electrode active material, a strip-like positive electrode conductive member, a positive electrode active material carrying portion carrying the positive electrode active material, and the positive electrode active material toward one side in the axial direction along the winding axis And a positive electrode conductive member including a positive electrode current collector that does not carry the positive electrode active material, and the negative electrode plate is a negative electrode active material and a strip-shaped negative electrode conductive member, A negative electrode active material carrying portion that carries a negative electrode active material and overlaps with the positive electrode active material carrying portion of the positive electrode plate via the separator, and extends from the negative electrode active material carrying portion toward the other side in the axial direction. It protrudes in the form and carries the negative electrode active material A negative electrode conductive member including a negative electrode current collector, and the current collector that is at least one of the positive electrode current collector and the negative electrode current collector is on the side opposite to the separator in the axial direction. A part of the ventilation path in which the end portions positioned are overlapped with each other while being wound, and the portion of the separator located on the radially inner side of the winding shaft communicates with the outside of the power generating element It is a battery which has a deficient part for ventilation which constitutes.

In the battery according to the present invention, the current collecting part is configured such that the end part located on the side opposite to the axial separator overlaps with each other while being wound. However, this current collection part has a ventilation defect part that constitutes a part of the ventilation path that communicates the part of the separator that is located radially inside the winding shaft with the outside of the power generation element.
As a result, even if gas is generated in the power generation element due to gasification of the electrolytic solution, this gas can be released to the outside of the power generation element through the ventilation path including the ventilation defect.
For this reason, it is possible to prevent such gas from staying in the power generation element. Thus, damage to the battery due to expansion of the power generation element itself, such as a crack in each member of the power generation element, can be suppressed.

  In the battery of the present invention, such a gas can be discharged to the outside of the power generation element. Therefore, when the power generation element is housed in a battery case equipped with a safety valve, the gas is further passed through the safety valve. It can be discharged outside the case.

Further, as the positive electrode current collector of the positive electrode conductive member and the negative electrode current collector of the negative electrode conductive member, that is, the current collector, for example, metal foil, a mesh member having a predetermined mesh shape, and continuous pores inside, A foamed plate material that allows ventilation between the front and back surfaces can be used.
In addition, as a ventilation defect portion, for example, when the current collecting portion is made of a metal foil, a ventilation hole perforated in the metal foil or an active material supporting portion (separator) on the side opposite to the axial direction is seen. A notch for ventilation formed at the end side can be mentioned. Further, when the current collecting part is configured by the above-described mesh member, the air gap included in the foamed plate material corresponds to the void forming the mesh, respectively.

  Furthermore, it is preferable that the above-described battery be a battery in which a plurality of the air-flow defect portions are dispersed in the circumferential direction of the wound current collecting portion and a plurality of the air-flow paths are provided.

  In the battery according to the present invention, a plurality of ventilation defects are dispersed and a plurality of ventilation paths are provided, so that the gas generated inside the power generation element can be released to the outside more easily.

  Further, in the battery described above, the current collector is foil-shaped, and has a current collector terminal member connected to a portion of the current collector that overlaps the end sides, It is preferable that the plurality of ventilation defects are batteries in which the adjacent ventilation defects are arranged in a staggered pattern so that they do not overlap each other when viewed in the circumferential direction of the current collector.

When a plurality of ventilation defects are arranged in a line in the circumferential direction of the foil-shaped current collector, ventilation can be performed through the ventilation defects. Depending on the presence of the ventilation defects, the positive electrode active material or the negative electrode The conductive path is reduced by energizing the active material and the current collector terminal member through the current collector.
On the other hand, in the battery of the present invention, since the plurality of ventilation defects are arranged as described above, ventilation through the ventilation defects can be secured. In addition, the above-described decrease in the conductive path can be suppressed, and the resistance generated in the current collector can be suppressed.

  Moreover, it is a battery of any one of Claims 1-3, Comprising: The said current collection part is foil shape, and the dimension of the said axial direction is the dimension of the said axial direction of the said airflow defect | deletion part. It is preferable that the battery has a longer form.

In the battery according to the present invention, the dimension in the axial direction of the ventilation defect is longer than the dimension in the circumferential direction.
As a result, as compared with the case where the circumferential dimension of the ventilation defect is longer than the dimension in the axial direction, the conductivity in the energization between the positive electrode active material or the negative electrode active material and the edge of the current collector is The reduction of the path can be suppressed, and the resistance generated in the current collector can be suppressed.

  Further, in the battery according to any one of claims 1 and 2, the current collecting part is configured by a net-like member having a predetermined mesh shape, A battery that is a void that forms a mesh of a mesh member is preferable.

In the battery of the present invention, the current collecting part is constituted by a mesh member having a predetermined mesh shape, and the air-flowing defect part is formed as a void that forms a mesh, so that the gas generated inside the power generation element is passed through the void. Can be reliably discharged to the outside.
In addition, it is possible to easily ventilate the inside of the power generation element over the entire circumference of the current collector without providing a vent hole or a ventable notch separately in the current collector.
In addition, you may comprise not only a current collection part but the whole positive electrode electrically-conductive member including a positive electrode active material support part, and the whole negative electrode electroconductive member including a negative electrode active material support part with the above-mentioned mesh member.

  Furthermore, it is a battery of any one of Claim 1 or Claim 2, Comprising: The said current collection part consists of a foam board | plate material which has a continuous pore which can ventilate between front and back inside, and for the said ventilation | gas_flowing The defective portion is preferably a battery having the above-mentioned continuous pores.

In the battery of the present invention, the current collector is formed of a foamed plate material having continuous pores inside and allowing ventilation between the front and back surfaces. For this reason, the gas generated inside the power generation element can be surely released to the outside of the power generation element through the continuous pore, using the continuous pores as ventilation defects.
Moreover, it is possible to ventilate the inside of the power generation element over the entire circumference of the current collector without providing a separate vent or notch in the current collector.
In addition, you may comprise not only a current collection part but the whole positive electrode conductive member including a positive electrode active material support part, and the whole negative electrode conductive member including a negative electrode active material support part with the above-mentioned foamed board | plate material.

  Furthermore, it is a battery of any one of Claims 1-6, Comprising: The battery case which accommodates the said electric power generation element inside is provided, This battery case has the internal pressure of the said battery case exceeding predetermined value. It is preferable that the battery has a safety valve that can be cleaved to release gas to the outside of the battery case.

  In the battery of the present invention, since the battery case that houses the power generation element is provided with a safety valve, even if gas is generated in the power generation element due to gasification of the electrolyte, the gas is released to the outside of the power generation element. Thus, gas can be discharged to the outside of the battery case through the safety valve.

  Furthermore, it is good to set it as the vehicle formed by mounting the battery of any one of Claims 1-7.

In the vehicle according to the present invention, the above-described battery including the power generation element having a ventilation defect portion that constitutes a part of the ventilation path that communicates with the outside of the power generation element is mounted on the current collector.
Thereby, the reliability of the battery is high, and it is possible to suppress the damage of the battery and the deterioration of the battery characteristics and to make the vehicle capable of good running.
Examples of vehicles equipped with batteries include electric vehicles and hybrid cars, as well as vehicles such as motorcycles, forklifts, electric wheelchairs, electric assist bicycles, electric scooters, and railway vehicles.

  Furthermore, another solution is a battery-mounted device on which the battery according to any one of claims 1 to 7 is mounted.

In the battery-equipped device according to the present invention, since the current collector is equipped with a battery including a power generation element having a ventilation defect part of the ventilation path that communicates with the outside of the power generation element, It can be set as the battery mounting apparatus provided with the high power supply.
In addition, the battery-equipped device equipped with a battery may be any device equipped with a battery and using it as one of energy sources. For example, a personal computer, a mobile phone, a battery-driven electric tool, etc. Various home appliances, office equipment, and industrial equipment.

  Hereinafter, Embodiments 1 to 3 of the present invention will be described with reference to the drawings.

(Embodiment 1)
As shown in FIG. 1, the vehicle 1 according to the first embodiment is a hybrid car that is driven in combination with an engine 3, a front motor 4, and a rear motor 5. The vehicle 1 includes a vehicle body 2, an engine 3, a front motor 4, a rear motor 5, a cable 7, and a battery pack 6 attached thereto. The battery pack 6 is attached to the vehicle body 2 of the vehicle 1 and is connected to the front motor 4 and the rear motor 5 by a cable 7. As shown in FIG. 2, the battery pack 6 has a configuration in which a plurality of battery modules 10 are arranged in a row.
The vehicle 1 can be driven by the engine 3, the front motor 4 and the rear motor 5 by a known means using the battery pack 6 as a driving power source for the front motor 4 and the rear motor 5.

  In this vehicle 1, the battery pack 6 includes a battery module 10 (10 </ b> A, 10 </ b> B) in which a plurality of single cells 100 (batteries) are arranged in a line and electrically connected in series by a bus bar 250 as shown in FIG. 2. Are arranged in rows (only two are shown in FIG. 2). This unit cell 100 is a lithium ion secondary battery of a rectangular unit cell having a substantially rectangular parallelepiped shape shown in FIGS.

The single battery 100 will be described.
As shown in FIGS. 3 to 5, the unit cell 100 includes a power generation element 130 described later, a case main body member 111 that houses the power generation element 130 in the housing portion 110 </ b> S, and a sealing member that closes the housing portion 110 </ b> S. The battery case 110 has a rectangular parallelepiped shape including 121.
The case main body member 111 is made of aluminum, and is integrally formed into a bottomed square box shape by deep drawing of the material, as shown in FIGS. The case body member 111 has an opening on the insertion side (upper side in FIG. 3), a rectangular plate-shaped bottom portion 116, and four first, second, third, and third portions extending in a direction perpendicular to the bottom portion 116 from the four sides. It has the 4th side part 112,113,114,115. Among these, the first and second side portions 112 and 113 are the largest side portions as shown in FIGS. 3 and 4, and both are the same shape and are arranged in parallel to each other. The third and fourth side portions 114 and 115 are disposed in parallel between the first and second side portions 112 and 113. The accommodating portion 110 </ b> S is an internal space surrounded by the first to fourth side portions 112 to 115 and the bottom portion 116.

On the other hand, the sealing member 121 is made of aluminum and is a rectangular flat plate as shown in FIGS. The sealing member 121 liquid-tightly closes the opening of the case body member 111 after housing the power generation element 130 in the housing portion 110 </ b> S of the case body member 111.
Further, the sealing member 121 includes a positive terminal insertion hole 122H and a negative terminal insertion hole 123H that are spaced apart from each other at a predetermined interval in the direction along the long side of the first side portion 141 (left and right direction in FIG. 3). It has a valve hole 124H penetrating inside and outside at a position between them. The valve hole 124H is closed by a plate-shaped safety valve 240 after an electrolytic solution (not shown) is injected into the housing portion 110S.

  The safety valve 240 is made of aluminum and is a rectangular flat plate. The safety valve 240 includes an annular valve contact portion 241 that is positioned on the outer periphery of the sealing valve 121 and that contacts the periphery of the valve hole 124H of the sealing member 121, and a valve function portion 242 that is positioned radially inward of the valve contact portion 241. This valve function part 242 has a one-way safety valve function that cleaves and releases gas to the outside of the battery case 110 when the internal pressure of the battery case 110 (case body member 111, sealing member 121) exceeds a predetermined value. .

  The power generation element 130 includes an electrolytic solution (not shown), and a strip-like positive electrode plate 140, a negative electrode plate 170, and a separator 190. The power generating element 130 is configured by winding a positive electrode plate 140 and a negative electrode plate 170 around a winding shaft 130X via a separator 190 (see FIGS. 3 to 7).

As shown in FIG. 7, the positive electrode plate 140 includes a strip-shaped positive electrode conductive member 141 made of aluminum foil having a predetermined thickness, and a positive electrode active material 148 made of lithium oxide such as lithium manganate. .
The positive electrode conductive member 141 includes a positive electrode active material carrying portion 142 that carries the positive electrode active material 148 on both sides thereof in a band shape. Further, the positive electrode conductive member 141 projects in a form extending from the positive electrode active material carrier 142 toward one side (right side in FIG. 7) of the axial direction LN along the winding axis 130X, and the positive electrode active material 148. Including a positive electrode current collector 143 that does not carry a positive electrode.

  The positive electrode current collector 143 includes a positive electrode end 143E at a position opposite to the separator 190 (rightward in FIG. 7) with respect to the axial direction LN. The positive electrode end portion 143E is wound around the winding shaft 130X so that its inner portion and outer portion overlap each other, and is electrically connected to a positive electrode current collecting terminal member 211 (current collecting terminal member) described later. The positive electrode connection part 144 connected to is formed.

  Further, as shown in FIGS. 6 and 7, the positive electrode current collector 143 has a plurality of positive side vent holes 145H (venting portions for ventilation) dispersed in the circumferential direction RT of the winding shaft 130X. . The positive-side vent holes 145H are power generation units in which the separator inner portion 191 located inside the winding shaft 130X in the radial direction of the separator 190 is housed in the housing portion 110S of the housing portion 110S of the case body member 111. It forms a part of the positive electrode side ventilation path PP (venting path) communicating with the power generation element exterior 130 </ b> S that is an external space of the element 130. Specifically, as shown in FIGS. 6 and 7, each positive-side vent hole 145H has a dimension (major axis) L1 (L1> 0) in the axial direction LN and a dimension (minor axis) L2 (L2) in the circumferential direction RT. > 0), and is formed in the positive electrode conductive member 141 with a long hole. Further, these positive electrode side vent holes 145H are arranged in two rows in the circumferential direction RT, and are arranged in a staggered manner at intervals such that adjacent positive electrode side vent holes 145H do not overlap each other when viewed in the circumferential direction RT (FIG. 6). reference). Thus, the positive electrode current collector 143 is provided with a plurality of positive electrode side ventilation paths PP.

  On the other hand, as shown in FIG. 7, the negative electrode plate 170 includes a strip-shaped negative electrode conductive member 171 made of copper foil having a predetermined thickness, and a negative electrode active material 178 made of carbon. The negative electrode conductive member 171 includes a negative electrode active material supporting portion 172 that supports the negative electrode active material 178 on both sides thereof in a band shape. Further, the negative electrode conductive member 171 protrudes in a form extending from the negative electrode active material supporting portion 172 toward the other side (left side in FIG. 7) in the axial direction LN, and the negative electrode not supporting the negative electrode active material 178 A current collector 173 is included.

  This negative electrode current collector 173 includes a negative electrode end 173E at a position opposite to the separator 190 (left side in FIG. 7) with respect to the axial direction LN. The negative electrode end portion 173E is wound around the winding shaft 130X so that its inner portion and outer portion overlap each other, and is electrically connected to a negative electrode current collecting terminal member 221 (current collecting terminal member) described later. The negative electrode connection part 174 connected to the is formed.

  6 and 7, the negative electrode current collector 173 has a plurality of negative side vent holes 175H (venting portions for ventilation) dispersed in the circumferential direction RT of the winding shaft 130X. Yes. Similar to the positive side vent hole 145H, the negative side vent hole 175H forms a part of the negative side vent path NP (vent path) that allows the separator inner portion 191 to communicate with the power generation element exterior 130S. Specifically, as shown in FIGS. 6 and 7, each negative-side air hole 175 </ b> H is an elongated hole in which the dimension (major axis) L <b> 1 in the axial direction LN is longer than the dimension (minor axis) L <b> 2 in the circumferential direction RT. The negative electrode conductive member 171 is perforated. These negative electrode side vent holes 175H are arranged in two rows in the circumferential direction RT, and are arranged in a staggered manner at intervals such that adjacent negative electrode side vent holes 175H do not overlap in the circumferential direction RT. Thus, the negative electrode current collector 173 is provided with a plurality of negative electrode side ventilation paths NP.

Next, the positive electrode current collecting terminal member 211 will be described.
This positive electrode current collecting terminal member 211 is formed by pressing an aluminum plate, and as shown in FIG. 8, the dimension in the longitudinal direction (vertical direction in FIG. 8) is the width direction (lower left-upper right direction in FIG. 8). Plate-shaped positive electrode flat plate part 212, four positive electrode current collector connection parts 213, and positive electrode external connection part 214 which are longer than the above-mentioned dimensions.
Among these, the positive electrode current collector connection portion 213 is bent from both sides in the width direction of the positive electrode flat plate portion 212 and extends in the thickness direction of the positive electrode flat plate portion 212. Among these positive electrode current collector connection portions 213, the positive electrode current collector connection portions 213 facing each other in the width direction (the lower left-upper right direction in FIG. 8) are the positive electrode connection portions of the positive electrode current collector 143 of the positive electrode plate 140. 144 are sandwiched and held, and the positive electrode current collector connecting portion 213 and the positive electrode connecting portion 144 are connected by laser welding.

  The positive electrode external connection portion 214 is located on one side in the longitudinal direction of the positive electrode flat plate portion 212 (upward in FIG. 8), bends from the positive electrode flat plate portion 212 and extends in the thickness direction of the positive electrode flat plate portion 212, and further on one side in the longitudinal direction. The positive electrode terminal portion 214a extending toward the end and positioned at the end is in the form of a rectangular flat plate. As shown in FIG. 3, the positive electrode terminal portion 214 a of the positive electrode external connection portion 214 protrudes to the outside of the sealing member 121 through the positive electrode terminal insertion hole 122 </ b> H of the sealing member 121. The positive electrode terminal portion 214a is liquid-tightly sealed by the positive electrode seal member 231 molded in the positive electrode terminal insertion hole 122H, and is electrically insulated from the sealing member 121.

Next, the negative electrode current collecting terminal member 221 will be described.
The negative electrode current collector terminal member 221 is formed by pressing a copper plate. As shown in FIG. 8, the negative electrode current collector terminal member 221 has the same shape as the positive electrode current collector terminal member 211 described above, and is in the longitudinal direction (vertical direction in FIG. 8). It has a flat plate-like negative electrode flat plate part 222, four negative electrode current collector connection parts 223, and a negative electrode external connection part 224 whose dimensions are longer than those in the width direction (lower left-upper right direction in FIG. 8).
Among these, the negative electrode current collector connecting portion 223 is bent from both sides of the negative electrode flat plate portion 222 in the width direction and extends in the thickness direction of the negative electrode flat plate portion 222. Of these negative electrode current collector connection portions 223, the negative electrode current collector connection portions 223 of the negative electrode plate 170 facing each other in the width direction (lower left-upper right direction in FIG. 8) are connected to each other. 174 is sandwiched between and held, and the negative electrode current collector connecting portion 223 and the negative electrode connecting portion 174 are connected by laser welding.

  The negative electrode external connection portion 224 is also located on one side in the longitudinal direction of the negative electrode flat plate portion 222 (upward in FIG. 8), bends from the negative electrode flat plate portion 222 and extends in the thickness direction of the negative electrode flat plate portion 222, and further on one side in the longitudinal direction. The negative terminal portion 224a extending toward the end and positioned at the end has a rectangular plate shape. The negative electrode terminal portion 224a of the negative electrode external connection portion 224 protrudes to the outside of the sealing member 121 through the negative electrode terminal insertion hole 123H of the sealing member 121 as shown in FIG. The negative electrode terminal portion 224a is liquid-tightly sealed by the negative electrode sealing member 232 molded in the negative electrode terminal insertion hole 123H, and is electrically insulated from the sealing member 121.

  In the unit cell 100 according to the first embodiment, as described above, the positive electrode end portions 143E of the positive electrode current collector 143 of the positive electrode plate 140 are configured to overlap each other while being wound. Similarly, the negative electrode side end portion 173E of the negative electrode current collector 173 of the negative electrode plate 170 is also configured to overlap each other while being wound.

However, in the first embodiment, the positive electrode current collector 143 has a plurality of positive electrode side vent holes 145H that form a part of the positive electrode side vent path PP dispersed in the circumferential direction RT of the positive electrode current collector 143. . Thereby, a plurality of positive electrode side ventilation paths PP including this positive electrode side ventilation hole 145H are provided. Similarly to the positive electrode current collector 143, the negative electrode current collector 173 also includes a plurality of negative electrode side vent holes 175H that are part of the negative electrode side vent path NP dispersed in the circumferential direction RT of the negative electrode current collector 173. is doing. Thereby, a plurality of negative electrode side ventilation paths NP including the negative electrode side ventilation holes 175H are provided.
Thus, even if gas is generated in the power generation element 130 due to gasification of the electrolytic solution (not shown), this gas includes the positive electrode side ventilation path PP including the positive electrode side ventilation hole 145H and the negative electrode side ventilation hole 175H. Each of the negative electrode side ventilation paths NP can be easily released to the power generation element exterior 130S. For this reason, it is possible to prevent such gas from staying in the power generation element 130 and expanding the power generation element 130.
Thus, the unit cell 100 can be prevented from being damaged, such as a crack in each member (the positive plate 140, the negative plate 170, and the separator 190) caused by the expansion of the power generation element 130.

In the cell 100 according to the first embodiment, the power generating element 130 is accommodated in the accommodating portion 110S of the case main body member 111 (battery case 110), and the sealing member 121 (battery case) that closes the accommodating portion 110S. 110) includes a safety valve 240.
For this reason, even if the above-mentioned gas is generated in the power generation element 130, this gas can be released once to the outside of the power generation element 130 </ b> S and further released to the outside of the battery case 110 through the safety valve 240. .

Further, in the unit cell 100 according to the first embodiment, both the positive side vent hole 145H and the negative side vent hole 175H are elongated holes in which the dimension L1 in the axial direction LN is longer than the dimension L2 in the circumferential direction RT.
Thereby, compared with the case where the dimension L2 of the positive electrode side vent hole 145H in the circumferential direction RT is made longer than the dimension L1 of the axial direction LN, the positive electrode active material 148 and the positive electrode end portion 143E of the positive electrode current collector 143 The decrease in the conduction path in the energization between the positive electrode current collector 143 and the resistance generated in the positive electrode current collector 143 can be suppressed. Similarly, the negative electrode active material 178 and the negative electrode side edge portion 173E of the negative electrode current collector 173 are compared to the case where the dimension L2 in the circumferential direction RT of the negative electrode side vent hole 175H is longer than the dimension L1 in the axial direction LN. The decrease of the conduction path in energization between the two can be suppressed, and the resistance generated in the negative electrode current collector 173 can be suppressed.

  By the way, a plurality of positive electrode side vent holes 145H in the positive electrode current collector portion 143 and a plurality of negative electrode side air vent holes 175H in the negative electrode current collector portion 173 are arranged in one row in the circumferential direction RT of the positive electrode current collector portion 143 or the negative electrode current collector portion 173. Even if they are arranged in a row, the air can be ventilated through the positive side air hole 145H and the negative side air hole 175H. However, if the space between the positive-side air holes 145H is narrow, the conductive path between the positive electrode active material 148 and the positive electrode side end portion 143E of the positive electrode current collector 143 decreases, and the resistance increases. Similarly, when the interval between the negative electrode side vent holes 175H is narrow, the conductive path between the negative electrode active material 178 and the negative electrode end portion 173E of the negative electrode current collector 173 decreases, and the resistance increases.

On the other hand, in the unit cell 100 according to the first embodiment, in the positive electrode current collector 143, the positive electrode side vent holes 145H are arranged in two rows, and the adjacent positive electrode side vent holes 145H are arranged in the positive electrode current collector unit 143. Are arranged in a zigzag pattern so as not to overlap in the circumferential direction RT. Similarly, in the negative electrode current collector 173, the negative electrode side vent holes 175H are arranged in two rows, and the adjacent negative electrode side vent holes 175H are arranged in a zigzag pattern so as not to overlap the negative electrode current collector part 173 when viewed in the circumferential direction RT. It is arranged.
For this reason, the point which can ensure ventilation | gas_flowing through the positive electrode side ventilation hole 145H and the negative electrode side ventilation hole 175H does not change. In addition, the above-described decrease in the conductive path between the positive electrode active material 148 and the positive electrode end portion 143E and the conductive path between the negative electrode active material 178 and the negative electrode end portion 173E can be suppressed. Resistance generated in the electric part 143 and the negative electrode current collector 173 can be suppressed.

Further, in the vehicle 1 according to the first embodiment, the unit cell 100 including the power generation element 130 having the positive electrode side ventilation path PP and the negative electrode side ventilation path NP, each of which communicates the separator inner portion 191 with the power generation element exterior 130S. It is installed.
As a result, the reliability of the unit cell 100 is high, and the vehicle 1 can be driven with good performance while suppressing damage to the unit cell 100 due to expansion of the power generation element 130 and deterioration of the battery characteristics.

(Embodiment 2)
The second embodiment will be described with reference to FIGS.
The unit cell 300 according to the second embodiment is different from the unit cell 100 according to the first embodiment described above in terms of the shape of the unit cell 300, the material used for the positive electrode conductive member 341 and the negative electrode conductive member 371, and the positive electrode collection of the positive electrode conductive member 341. The connection method of the electrical current part 343 and the positive current collector terminal member 411 and the negative current collector part 373 of the negative electrode conductive member 371 and the negative current collector terminal member 421 are different. However, the configuration of the power generating element 330, the positive electrode plate 340 and the negative electrode plate 370 are wound through the separator 190, and the positive electrode current collector 343 is provided on one side in the axial direction LN and the negative electrode current collector 373 is provided on the other side. Similarly, the unit cell 300 is a lithium ion secondary battery.
Therefore, the description will be focused on the parts different from the first embodiment, and the same parts are denoted by the same reference numerals as those of the first embodiment, and the description will be omitted or simply performed.

The unit cell 300 is a cylindrical unit cell. As shown in FIG. 9, the unit cell 300 includes a power generation element 330, a case main body member 311 that houses the power generation element 330 in the housing portion 310 </ b> S, and a sealing member 321 that closes the housing portion 310 </ b> S. The case 310 is constituted.
The case main body member 311 is made of aluminum, and is integrally formed into a bottomed cylindrical shape by deep drawing of the material. The case body member 311 has an opening on the insertion side (upper side in FIG. 9), and has a cylindrical side portion 312 and a radial direction from the side portion 312 on the side opposite to the insertion side (lower side in FIG. 9). And a bottom portion 316 extending inwardly. A negative electrode terminal insertion hole 323 </ b> H is drilled in a central portion of the bottom portion 316 in the radial direction. The accommodating portion 310 </ b> S is an internal space surrounded by the side portion 312 and the bottom portion 316.

On the other hand, the sealing member 321 is made of aluminum, and is an annular flat plate having a positive terminal insertion hole 322H at the radial center. The sealing member 321 also has a valve hole 324H penetrating inside and outside on the radially outer side than the positive electrode terminal insertion hole 322H.
The sealing member 321 liquid-tightly closes the opening of the case main body member 311 after accommodating the power generation element 330 in the accommodating portion 310 </ b> S of the case main body member 311.

  The valve hole 324H is closed by a plate-shaped safety valve 440 after an electrolytic solution (not shown) is injected into the housing portion 310S. The safety valve 440 has a one-way safety valve function of cleaving and releasing gas to the outside of the battery case 310 when the internal pressure of the battery case 310 (the case body member 311 and the sealing member 321) exceeds a predetermined value.

  The power generation element 330 includes an electrolyte (not shown), and a positive electrode plate 340, a negative electrode plate 370, and a separator 190, all of which are band-shaped. The power generation element 330 is configured by winding a positive electrode plate 340 and a negative electrode plate 370 around a winding shaft 330X via a separator 190 (see FIG. 9).

  As shown in FIG. 9, the positive electrode plate 340 includes a strip-shaped positive electrode conductive member 341 made of a foamed aluminum plate having a predetermined thickness, and a positive electrode active material 148. The positive electrode conductive member 341 includes a positive electrode active material carrying part 342 that carries the positive electrode active material 148 on both sides thereof in a band shape. Further, the positive electrode conductive member 341 protrudes in a form extending from the positive electrode active material carrier 342 toward one side (upward in FIG. 9) in the axial direction LN along the winding axis 330X, and the positive electrode active material 148 A positive electrode current collector 343 that is not supported is included.

As shown in FIGS. 9 and 10, the positive electrode current collector 343 has a front surface 343a and a back surface 343b on the opposite side of the front surface 343a, and a positive electrode capable of venting between the front surface 343a and the back surface 343b. Side continuous pores 345H (ventilation defect) are included inside itself.
The positive electrode side continuous pores 345H are power generation elements in which the separator inner portion 391 located inside the winding shaft 330X in the radial direction of the separator 190 is housed in the housing portion 310S of the housing portion 310S of the case body member 311. It forms part of the positive electrode side ventilation path PP (venting path) communicating with the power generation element exterior 330S, which is the external space of 330.

  Further, the positive electrode current collector 343 includes a positive electrode end 343E at a position on the side opposite to the axial LN separator 190 (upward in FIG. 9). The positive electrode side end portion 343E is wound around the winding shaft 330X so that the inner portion and the outer portion thereof overlap each other to form a positive electrode connection portion 344.

The positive electrode current collector 343 is electrically connected to a positive electrode current collector terminal member 411 (current collector terminal member) described below.
Specifically, the positive electrode current collecting terminal member 411 is a cylindrical bar made of aluminum, as shown in FIGS. 9 and 11. The positive current collector terminal member 411 includes a positive external terminal portion 414 located on one side (upward in FIG. 9) in its own axial direction, and a positive current collector connection portion 413 located on the opposite side. Contains. The positive current collector terminal member 411 has its own axis aligned with the winding shaft 330X, the positive external terminal portion 414 is outside the sealing member 321, and the positive current collector connection portion 413 is in the housing portion 310S of the battery case 310. Are arranged so as to be located respectively.
The positive electrode connection portion 344 is positioned on the outer peripheral side of the positive electrode current collector connection portion 413, then crimped to reduce the diameter, and further laser welded to be fixed to the positive electrode current collector connection portion 413.

  Moreover, the positive electrode external terminal part 414 of the positive electrode current collecting terminal member 411 protrudes outside the sealing member 321 through the positive electrode terminal insertion hole 322H of the sealing member 321 as shown in FIG. The positive electrode current collecting terminal member 411 is liquid-tightly sealed by the positive electrode seal member 431 molded in the positive electrode terminal insertion hole 322H, and is electrically insulated from the sealing member 321.

  On the other hand, as shown in FIG. 9, the negative electrode plate 370 includes a strip-shaped negative electrode conductive member 371 and a negative electrode active material 178 made of a foamed copper plate having a predetermined thickness. The negative electrode conductive member 371 includes a negative electrode active material supporting portion 372 that supports the negative electrode active material 178 on both sides thereof in a band shape. Further, the negative electrode conductive member 371 protrudes in a form extending from the negative electrode active material carrying portion 372 toward the other side (downward in FIG. 9) of the axial direction LN along the winding axis 330X, and the negative electrode active material 178 is A negative electrode current collector 373 that is not supported is included.

As shown in FIGS. 10 and 11, the negative electrode current collector 373 also has a front surface 373a and a back surface 373b opposite to the front surface 373a, and a negative electrode that allows ventilation between the front surface 373a and the back surface 373b. Side continuous pores 375H (ventilation defect) are included inside itself.
The negative electrode side continuous pores 375H constitute a part of a negative electrode side ventilation path NP (venting path) that communicates the separator inner portion 391 of the separator 190 with the power generation element exterior 330S in the housing part 310S of the case body member 311. ing.

  Further, the negative electrode current collector 373 includes a negative electrode end 373E at a position opposite to the axial LN separator 190 (downward in FIG. 9). The negative electrode end portion 373E is wound around the winding shaft 330X, and the inner side portion and the outer side portion of the negative electrode side edge portion 373E overlap each other to form a negative electrode connection portion 374.

The negative electrode current collector 373 is electrically connected to a negative electrode current collector terminal member 421 (current collector terminal member) described below.
Specifically, the negative electrode current collecting terminal member 421 is a columnar bar made of copper, as shown in FIGS. The negative electrode current collector terminal member 421 includes a negative electrode external terminal portion 424 located on the other side (downward in FIG. 9) of its own axial direction, and a negative electrode current collector connection portion 423 located on the opposite side thereof. Contains. The negative electrode current collector terminal member 411 also has its own axis aligned with the winding shaft 330X, the negative electrode external terminal portion 424 is outside the bottom 316 of the case body member 311, and the negative electrode current collector connection portion 423 is the battery case 310. It arrange | positions so that it may be located in the accommodating part 310S.
The negative electrode connection part 374 is positioned on the outer peripheral side of the negative electrode current collector connection part 423, then crimped to reduce the diameter, and further laser welded to be fixed to the negative electrode current collector connection part 423.

  Further, the negative electrode external terminal portion 424 of the negative electrode current collecting terminal member 421 protrudes to the outside of the sealing member 321 through the negative electrode terminal insertion hole 323H in the bottom portion 316 of the case main body member 311 as shown in FIG. The negative external terminal portion 424 is liquid-tightly sealed by a negative seal member 432 molded in the negative terminal insertion hole 323H, and is electrically insulated from the case main body member 311.

  Also in the single battery 300 according to the second embodiment, as described above, the positive electrode end portions 343E of the positive electrode current collector 343 of the positive electrode plate 340 are configured to overlap each other while being wound. Similarly, the negative electrode end portion 373E of the negative electrode current collector 373 of the negative electrode plate 370 is also configured to overlap each other while being wound.

However, in this unit cell 300, the positive electrode current collector 343 is constituted by a positive electrode conductive member 341 that is a foamed aluminum plate having positive electrode side continuous pores 345H forming a part of the positive electrode side ventilation path PP. Similarly to the positive electrode current collector 343, the negative electrode current collector 373 is composed of a negative electrode conductive member 371 that is a foamed copper plate having negative electrode side continuous pores 375H forming a part of the negative electrode side ventilation path NP.
Thus, even if gas is generated in the power generation element 330 due to gasification of the electrolytic solution, this gas is separated into the positive-side ventilation path PP including the positive-side continuous pores 345H and the negative-side ventilation path including the negative-side continuous pores 375H. It can be discharged to the outside of the power generation element 330S through the NP. For this reason, it is possible to prevent such gas from staying in the power generation element 330 and expanding the power generation element 330 in the housing portion 310 of the battery case 310.
Thus, the unit cell 300 can be prevented from being damaged, such as a crack in each member (the positive plate 340, the negative plate 370, and the separator 190) due to the expansion of the power generation element 330.
In addition, the positive electrode current collector 343 and the negative electrode current collector 373 can be ventilated in the power generation element 330 in the entire circumference of the positive electrode current collector 343 and the negative electrode current collector 373 without providing a vent or a notch separately.

(Deformation)
A modification of the second embodiment will be described with reference to FIGS. 12 and 13.
The unit cell 500 according to this modification is different from the unit cell 300 according to Embodiment 2 described above only in the materials used for the positive electrode conductive member 541 and the negative electrode conductive member 571.
However, the shape of the unit cell 500, the connection between the positive electrode current collector 543 and the positive electrode current collector terminal member 411 of the positive electrode conductive member 541 and the negative electrode current collector 373 and the negative electrode current collector terminal member 421 of the negative electrode conductive member 571 are connected. The method and the point that the cell 500 is a lithium ion secondary battery are the same. Further, the configuration of the power generation element 530, the positive electrode plate 540 and the negative electrode plate 570 are wound through the separator 190, and the positive electrode current collector 543 is provided on one side in the axial direction LN and the negative electrode current collector 573 is provided on the other side. Is the same.
Therefore, the description will be focused on the parts different from the first and second embodiments, and the same parts are denoted by the same reference numerals as those of the first and second embodiments, and the description will be omitted or simplified.

  As shown in FIG. 12, the unit cell 500 includes a power generation element 530, a case main body member 311 that houses the power generation element 530 in the housing portion 310S, and a sealing member 321 that closes the housing portion 310S. The battery case 310 is configured. The sealing member 321 liquid-tightly closes the opening of the case main body member 311 after the power generation element 530 is accommodated in the accommodating portion 310 </ b> S of the case main body member 311.

  The power generation element 530 includes an electrolytic solution (not shown), and a strip-like positive electrode plate 540, a negative electrode plate 550, and a separator 190. The power generation element 530 is configured by winding a positive electrode plate 540 and a negative electrode plate 570 around a winding shaft 530X via a separator 190 (see FIG. 12).

  As shown in FIGS. 12 and 13, the positive electrode plate 540 includes a belt-like positive electrode conductive member 541 made of aluminum and made of a net member having a predetermined mesh shape, and a positive electrode active material 148. This positive electrode conductive member 541 carries the positive electrode active material 148 in a band shape on both sides in the thickness direction (the left and right direction in the portion where the positive electrode plate 540 and the negative electrode plate 550 are wound through the separator 190 in FIG. 12). A positive electrode active material carrier 542 is included. In addition, the positive electrode conductive member 541 protrudes in a form extending from the positive electrode active material carrier 542 toward one side (upward in FIG. 12) in the axial direction LN along the winding axis 530X, and the positive electrode active material 148 is A positive electrode current collector 543 that is not supported is included.

  As shown in FIGS. 12 and 13, the positive electrode current collector 543 has a positive electrode side gap 545H (venting portion for ventilation) forming a mesh of a mesh member (positive electrode conductive member 541). The positive electrode side gap 545H includes a power generation element 530 in which the separator inner portion 591 of the separator 190 located on the radial inner side of the winding shaft 530X is housed in the housing portion 310S of the housing portion 310S of the case body member 311. Part of the positive electrode side ventilation path PP (venting path) communicating with the power generation element outside 530S which is the external space of the cathode.

  Further, the positive electrode current collector 543 includes a positive electrode end 543E at a position opposite to the axial direction LN separator 190 (upward in FIG. 12). The positive electrode end portion 543E is wound around the winding shaft 530X, and the inner portion and the outer portion thereof are overlapped with each other to form a positive electrode connection portion 544 (see FIGS. 12 and 13). .

  The positive electrode current collector 543 is electrically connected to a positive electrode current collector terminal member 411 (current collector terminal member). Specifically, the positive electrode connection portion 544 is positioned on the outer peripheral side of the positive electrode current collector connection portion 413, then crimped to reduce the diameter, and further laser welded to be fixed to the positive electrode current collector connection portion 413. ing.

  On the other hand, as shown in FIGS. 12 and 13, the negative electrode plate 570 includes a strip-shaped negative electrode conductive member 571 made of copper and made of a net-like member having a predetermined mesh shape, and a negative electrode active material 178. This negative electrode conductive member 571 carries the negative electrode active material 178 in the form of a band on both sides in the thickness direction (in FIG. 12, the left and right direction in the portion where the positive electrode plate 540 and the negative electrode plate 550 are wound through the separator 190). A negative electrode active material carrier 572 is included. Further, the negative electrode conductive member 571 protrudes in a form extending from the negative electrode active material carrying portion 572 toward the other side (downward in FIG. 12) of the axial direction LN along the winding axis 530X, and the negative electrode active material 178 is A negative electrode current collector 573 that is not supported is included.

  As shown in FIGS. 12 and 13, the negative electrode current collector 573 also includes a negative electrode side gap 575H (venting portion for ventilation) forming a mesh of a mesh member (negative electrode conductive member 571). The negative electrode side gap 575H forms part of a negative electrode side ventilation path NP (venting path) that communicates the separator inner portion 591 of the separator 190 with the power generation element exterior 530S in the housing portion 310S of the case body member 311. Yes.

  Further, the negative electrode current collector 573 includes a negative electrode end 573E at a position opposite to the axial LN separator 190 (downward in FIG. 12). The negative electrode end portion 573E is wound around the winding shaft 530X, and the inner portion and the outer portion thereof are overlapped with each other to form a negative electrode connection portion 574.

  The negative electrode current collector 573 is electrically connected to the negative electrode current collector terminal member 421 (current collector terminal member). Specifically, the negative electrode connection portion 574 is positioned on the outer peripheral side of the negative electrode current collector connection portion 423, then crimped to reduce the diameter, and further laser welded to be fixed to the negative electrode current collector connection portion 423. ing.

  Also in the unit cell 500 according to this modified embodiment, as described above, the positive electrode side end portion 543E of the positive electrode current collector 543 of the positive electrode plate 540 is configured to overlap each other while being wound. Similarly, the negative electrode side end portion 573E of the negative electrode current collector 573 of the negative electrode plate 570 is also configured to overlap each other while being wound.

However, in this single cell 500, the positive electrode current collector portion 543 is configured by a net-like positive electrode conductive member 341 having a positive electrode side gap 545H that forms part of the positive electrode side ventilation path PP, and the ventilation gap portion is formed as a positive electrode side gap. 545H. Similarly to the positive electrode current collector 543, the negative electrode current collector 573 is composed of a net-like negative electrode conductive member 371 having a negative electrode side gap 375H forming a part of the negative electrode side ventilation path NP. A negative electrode side gap 375H is used.
For this reason, even if gas is generated in the power generation element 530 due to gasification of the electrolytic solution, this gas is separated into the positive-side ventilation path PP including the positive-side gap 545H and the negative-side ventilation path NP including the negative-side gap 375H. Through this, it can be reliably discharged to the outside of the power generation element 530S.
In addition, the positive electrode current collector 543 and the negative electrode current collector 573 can be ventilated in the power generation element 530 on the entire circumference of the positive electrode current collector 543 and the negative electrode current collector 573 without providing a vent or a notch separately.

(Embodiment 3)
A notebook type personal computer 601 according to the third embodiment is obtained by mounting the unit cell 300 of the above-described second embodiment by a known method.
The notebook personal computer 601 is a battery-equipped device having a main body 602 and a battery pack 606, as shown in FIG. The battery pack 606 is accommodated in the main body 602, and a plurality of single cells 300 are electrically connected in series, not shown, inside the battery pack 606.
In the laptop personal computer 601 according to the third embodiment, as described above, the positive electrode side ventilation path PP that connects the separator inner portion 391 to the power generation element exterior 330S to the positive electrode current collector 343 and the negative electrode current collector 373, respectively. A unit cell 300 including a power generation element 330 having a positive-side air hole 345H and a negative-side air hole 375H constituting a part of the negative-side air passage NP is provided. Therefore, a highly reliable battery pack 606 and notebook personal computer 601 can be obtained.

As mentioned above, although this invention was demonstrated according to Embodiment 1-3 and a modification, this invention is not limited to the above-mentioned embodiment and a modification, In the range which does not deviate from the summary, it changes suitably. Needless to say, this is applicable.
For example, in the first embodiment, the positive electrode current collector 143 is made of an aluminum foil, and the air-flow defect portion is a positive-side air hole 145H formed in the aluminum foil. Similarly, the negative electrode current collector 173 was made of a copper foil, and the air-flowing defect portion was a negative-side air hole 175H formed in the copper foil.
However, when the current collector is made of a metal foil, a ventilation notch formed on the side opposite to the active material carrying part or the separator as viewed in the axial direction may be used as the ventilation defect. good. In this case, it is preferable to adopt a form extending in the axial direction.

In the first embodiment, the positive electrode side vent holes 145H and the negative electrode side vent holes 175H are arranged in two rows in the circumferential direction RT of the positive electrode current collector portion 143 and the negative electrode current collector portion 173, and adjacent positive electrode sides. The ventilation holes 145H and the negative-side ventilation holes 175H are arranged in a staggered manner at intervals that do not overlap each other when viewed in the circumferential direction RT.
However, the position where the air-flowing defect portion is arranged in the current collector and the form and quantity of the air-flowing defect portion can be changed as appropriate.

  Moreover, in Embodiment 1, 2, and the modification, the square-shaped or cylindrical lithium ion secondary battery was illustrated as unit cell 100,300 grade | etc.,. However, the type and form of the battery can be changed as appropriate.

  In the first embodiment, a four-wheel hybrid car is illustrated as the vehicle 1. However, as a type of vehicle equipped with a battery, for example, it can be applied to other types of vehicles such as an electric vehicle, a motorcycle, a forklift, an electric wheelchair, an electric assist bicycle, an electric scooter, and a railway vehicle.

In the second embodiment, not only the positive electrode current collector 343 but also the entire positive electrode conductive member 341 including the positive electrode active material carrier 342 is composed of a band-shaped foamed aluminum plate. Similarly, not only the negative electrode current collector 373 but also the entire negative electrode conductive member 371 including the negative electrode active material carrier 372 was formed of a band-shaped foamed copper plate.
However, in the positive electrode conductive member or the negative electrode conductive member, only the current collecting part may be formed of a foamed plate material.

In the modified embodiment, not only the positive electrode current collector 543 but also the entire positive electrode conductive member 541 including the positive electrode active material carrier 542 is formed of a net-like member made of aluminum. Similarly, not only the negative electrode current collector 573 but also the entire negative electrode conductive member 571 including the negative electrode active material carrier 572 was formed of a net-like member made of copper.
However, in the positive electrode conductive member or the negative electrode conductive member, only the current collector may be formed of a net-like member made of metal.

In the third embodiment, the notebook personal computer 601 is exemplified as the battery-equipped device.
However, any type of battery-equipped device equipped with a battery may be any device equipped with a battery and using it as one of the energy sources. For example, it is driven by a battery such as a mobile phone or a battery-driven electric tool. It can also be used in other types of battery-equipped devices such as various home appliances, office equipment, and industrial equipment.

  In the third embodiment, the laptop personal computer 601 in which the single battery 300 according to the second embodiment is mounted on the battery pack 606 is exemplified. However, the type, form, and quantity of the battery mounted on the battery-equipped device can be changed as appropriate.

1 is a perspective view of a vehicle according to a first embodiment. 1 is a perspective view showing a battery pack mounted on a vehicle according to Embodiment 1. FIG. It is a figure which shows the single battery which concerns on Embodiment 1, and is sectional drawing seen from the front. It is a figure which shows the cell which concerns on Embodiment 1, and is AA arrow sectional drawing of FIG. It is a figure which shows the single battery which concerns on Embodiment 1, and is BB arrow sectional drawing of FIG. FIG. 3 is a perspective view showing a power generation element of a unit cell according to Embodiment 1. It is a figure which shows the electric power generation element of the cell which concerns on Embodiment 1, and is CC sectional view taken on the line of FIG. FIG. 3 is a perspective view showing a current collecting terminal member and an external terminal member respectively used for both poles of the unit cell according to Embodiment 1. It is a figure which shows the single battery which concerns on Embodiment 2, and is sectional drawing seen from the front. FIG. 10 is an explanatory diagram for explaining a main part in FIG. 9 in the power generation element of the single battery according to the first embodiment. FIG. 3 is a perspective view showing a power generation element of a unit cell according to Embodiment 1. It is a figure which shows the cell which concerns on a deformation | transformation form, and is sectional drawing seen from the front. It is a perspective view which shows the electric power generation element of the cell which concerns on a deformation | transformation form. 10 is a perspective view of a notebook personal computer according to Embodiment 3. FIG.

Explanation of symbols

1 Vehicle 601 Notebook personal computer (equipment with battery)
100, 300, 500 single cell (battery)
110, 310 Battery case 130, 330, 530 Power generation element 130S, 330S, 530S Power generation element outside (outside of power generation element)
130X, 330X, 530X Winding axis LN Axial direction RT Circumferential direction 140, 340, 540 Positive electrode plate 141, 341, 541 Positive electrode conductive member 142, 342, 542 Positive electrode active material carrier 143, 343, 543 Positive electrode current collector (collector) Electric Department)
143E, 343E, 543E Positive electrode side edge (edge side)
343a Front surface 343b Back surface 144, 344, 544 Positive electrode connection part (part where end sides overlap)
PP Positive air passage (ventilation route)
145H, 345H Positive-side continuous pores (venting part for ventilation)
545H Positive electrode gap (vented part for ventilation)
L1 Dimension in the axial direction (of the ventilation defect) L2 Dimension in the circumferential direction (of the ventilation defect) 148 Positive electrode active material 170, 370, 570 Negative electrode plate 171, 371, 571 Negative electrode conductive member 172, 372, 572 Material carrying part 173,373,573 Negative electrode current collector (current collector)
173E, 373E, 573E Negative electrode edge (edge)
373a Front surface 373b Back surface 174, 374, 574 Negative electrode connection part (part where end sides overlap)
NP Negative side ventilation path (venting path)
175H, 375H Negative side continuous pores (venting part for ventilation)
575H Negative electrode side gap (Deficient part for ventilation)
178 Negative electrode active material 190 Separator 191, 391, 591 Separator inner part (part of separator in the radial direction of winding axis)
211 Positive Current Collection Terminal Member (Current Collection Terminal Member)
221 Negative current collecting terminal member (current collecting terminal member)
240 Safety valve 411 Positive current collecting terminal member (current collecting terminal member)
421 Negative electrode current collector terminal member (current collector terminal member)
440 Safety valve

Claims (9)

Electrolyte, and
Both are batteries comprising a power generation element formed by winding a belt-like positive electrode plate and a negative electrode plate around a winding axis via a belt-like separator,
The positive plate is
A positive electrode active material;
A belt-like positive electrode conductive member,
A positive electrode active material carrying part carrying the positive electrode active material, and
A positive electrode conductive member that includes a positive electrode current collector that protrudes in a form extending from the positive electrode active material carrying part toward one side in the axial direction along the winding axis, and does not carry the positive electrode active material;
The negative electrode plate is
A negative electrode active material;
A strip-shaped negative electrode conductive member,
A negative electrode active material carrying part that carries the negative electrode active material and overlaps with the positive electrode active material carrying part of the positive electrode plate via the separator; and
A negative electrode conductive member including a negative electrode current collector that protrudes in a form extending from the negative electrode active material carrying part toward the other side in the axial direction, and does not carry the negative electrode active material,
The current collector that is at least one of the positive electrode current collector and the negative electrode current collector,
Among these, the end portion located on the side opposite to the separator in the axial direction is configured to overlap each other while being wound, and
A battery having a venting portion constituting a part of a ventilation path for communicating a portion of the separator located radially inside the winding shaft with the outside of the power generation element. The battery according to claim 1,
A plurality of the air-flowing defect parts are dispersed in the circumferential direction of the wound current collecting part,
A battery comprising a plurality of the ventilation paths. The battery according to claim 2,
The current collector is foil-shaped,
Among the current collectors, it has a current collector terminal member formed by connecting to the part where the end sides overlap each other,
The plurality of ventilation defects are
A battery in which the adjacent air-flow defects are arranged in a zigzag pattern so as not to overlap each other when viewed in the circumferential direction of the current collector. The battery according to any one of claims 1 to 3,
The current collector is foil-shaped,
The ventilation defect portion is
A battery in which the dimension in the axial direction is longer than the dimension in the circumferential direction. The battery according to any one of claims 1 and 2,
The current collector is composed of a mesh member having a predetermined mesh shape,
The battery defect is a battery that forms a mesh of the mesh member. The battery according to any one of claims 1 and 2,
The current collector is
It consists of a foam board that has continuous pores inside that can ventilate between the front and back surfaces.
The battery is the continuous pore, wherein the air-flowing defect portion. The battery according to any one of claims 1 to 6,
A battery case that houses the power generation element inside,
This battery case is a battery having a safety valve that is cleaved and releases gas to the outside of the battery case when the internal pressure of the battery case exceeds a predetermined value. A vehicle comprising the battery according to any one of claims 1 to 7. The battery mounting apparatus which mounts the battery of any one of Claims 1-7.

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