JP5381588B2 - Lithium ion secondary battery, vehicle and battery-equipped equipment - Google Patents

Description

  The present invention relates to a lithium ion secondary battery comprising a positive electrode plate having a positive electrode active material layer, a negative electrode plate having a negative electrode active material layer, and a separator, a vehicle equipped with this lithium ion secondary battery, and a battery-equipped device. About.

In recent years, lithium ion secondary batteries (hereinafter also simply referred to as batteries) have been used as power sources for driving portable electronic devices such as hybrid cars, notebook computers, and video camcorders.
In Patent Document 1, the width of the active material coating portion (negative electrode active material layer) of the negative electrode plate (negative electrode plate) is set to the width of the active material coating portion (positive electrode active material layer) of the positive electrode plate (positive electrode plate). A wound type lithium ion secondary battery set larger than the above is disclosed.

JP 2005-190913 A

By the way, in the battery of Patent Document 1, the negative electrode active material layer is located opposite to the positive electrode active material layer via the separator, and opposite to the negative electrode active material layer in the width direction, and is opposed via the separator. The positive electrode active material layer is divided into a non-opposing portion where no positive electrode active material layer exists.
In this battery, electrons can be exchanged not only between the opposing portion of the negative electrode active material layer and the negative electrode current collector plate but also between the non-opposing portion and the negative electrode current collector plate. Therefore, when this battery is charged, lithium ions released from the positive electrode active material layer are inserted into the opposing portion of the opposing negative electrode active material layer, and the lithium ions spread from the end of the positive electrode active material layer to the outside. The ions move and are inserted into the non-opposing portion.
However, since this non-opposing portion does not have an opposing positive electrode active material layer, it is difficult to release lithium ions in the non-opposing portion from the non-opposing portion during discharge. That is, this non-opposing portion is a negative electrode active material layer, but only occludes lithium ions and hardly participates in discharge. For this reason, the amount of lithium ions that can be released from the negative electrode active material layer during discharge is reduced by the amount of lithium ions inserted into the non-opposing portion during charging, that is, the battery capacity is reduced. End up.

  The present invention has been made in view of such a problem, and is capable of suppressing lithium ion insertion into the non-opposing portion of the negative electrode active material layer during charging, thereby suppressing reduction in battery capacity. An object is to provide an ion secondary battery, a vehicle equipped with the lithium ion secondary battery, and a battery-equipped device.

  One embodiment of the present invention is a positive electrode current collector plate having conductivity, a positive electrode plate including positive electrode active material particles and including a positive electrode active material layer disposed on the positive electrode current collector plate, and a negative electrode having conductivity. A current collector plate, a negative electrode plate having a negative electrode active material layer that includes negative electrode active material particles and is disposed on the negative electrode current collector plate, and is interposed between the positive electrode plate and the negative electrode plate A positive electrode active material layer and the negative electrode active material layer facing each other through the separator, wherein the negative electrode active material layer is interposed between the positive electrode and the positive electrode active material layer. The negative electrode plate includes an opposing portion that faces the active material layer, and a non-opposing portion that does not have the positive electrode active material layer that faces through the separator, and the negative electrode plate includes the non-facing portion of the negative electrode active material layer. Insulation interposed at least in part between the negative electrode current collector plate A lithium ion secondary battery having the insulating member.

  In the above-described battery, as described above, the negative electrode plate has an insulating member interposed at least in part between the non-facing portion of the negative electrode active material layer and the negative electrode current collector plate. For this reason, in the part where the insulating member is interposed in the negative electrode active material layer, exchange of electrons between this part and the negative electrode current collector plate can be suppressed. Therefore, since the insulating member is interposed, the region of the non-opposing portion into which lithium ions are inserted when the battery is charged can be reduced, and the reduction in battery capacity can be suppressed.

In addition, as a battery, the winding type battery which has a wound type electric power generation element which all winds through a separator between a strip-like positive electrode plate and a negative electrode plate, a plurality of positive electrode plates, and a plurality of Examples include a stacked battery having a stacked power generation element in which negative electrode plates are alternately stacked via separators.
In addition, examples of the material of the insulating member include a solid (dense) resin that is insulative and does not have through holes, and a metal oxide such as aluminum oxide.

  Furthermore, in the lithium ion secondary battery described above, the positive electrode plate, the negative electrode plate, and the separator each having a strip shape extending in the longitudinal direction are wound in the longitudinal direction to form a wound power generation element. Of the strip-like negative electrode active material layer extending in the longitudinal direction, the non-facing portion includes width-direction end-side non-facing portions that are located on both ends in the width direction orthogonal to the longitudinal direction, and the insulating member Is preferably a lithium ion secondary battery having a strip shape extending in the longitudinal direction and interposed between the width direction end side non-opposing portion and the negative electrode current collector plate.

  The above-described battery includes a wound power generation element, and an insulating member is interposed between the width direction end side non-opposing portion and the negative electrode current collector plate. In the strip-shaped negative electrode active material layer extending in the longitudinal direction, the width direction end side non-facing portion occupies most of the non-facing portion. Therefore, by interposing the insulating member here, when the battery is charged, the lithium ions inserted into the non-opposing portion can be greatly reduced, and the decrease in the battery capacity due to this can be sufficiently suppressed. Can do.

  Or the other aspect of this invention is a vehicle which mounts one of the above-mentioned lithium ion secondary batteries, and uses the electrical energy stored in this lithium ion secondary battery for all or one part of a motive power source.

  Since the above-mentioned vehicle is equipped with a battery that suppresses a decrease in battery capacity, it can be a vehicle having a power source with stable performance.

  The vehicle may be a vehicle that uses electric energy from a battery as a whole or a part of a power source. For example, an electric vehicle, a hybrid vehicle, a plug-in hybrid vehicle, a hybrid railway vehicle, a forklift, an electric wheelchair, an electric vehicle Examples include assist bicycles and electric scooters.

  Alternatively, according to another aspect of the present invention, a battery-mounted device in which any one of the above-described lithium ion secondary batteries is mounted and the electric energy stored in the lithium ion secondary battery is used for all or part of the driving energy source. It is.

  Since the battery-mounted device described above is mounted with a battery in which a decrease in battery capacity is suppressed, it can be a battery-mounted device having a drive energy source with stable performance.

  In addition, as a battery mounting apparatus, what is necessary is just an apparatus which mounts a battery and uses this for all or one part of an energy source, for example, a personal computer, a mobile telephone, a battery-powered electric tool, an uninterruptible power supply, etc. And various home appliances driven by batteries, office equipment, and industrial equipment.

1 is a perspective view of a battery according to Embodiment 1. FIG. 2 is a perspective view of a positive electrode plate according to Embodiment 1. FIG. 3 is a perspective view of a negative electrode plate according to Embodiment 1. FIG. It is an expanded sectional view (AA part of Drawing 3) of the negative electrode plate of Embodiment 1. FIG. 4 is an explanatory diagram of a battery manufacturing process according to the first embodiment. 6 is a perspective view of a battery according to a first modification. FIG. It is a perspective view of the positive electrode plate of modification 1. It is a perspective view of the negative electrode plate of modification 1. It is explanatory drawing of the vehicle concerning Embodiment 2. FIG. It is explanatory drawing of the hammer drill concerning Embodiment 3. FIG.

(Embodiment 1)
Next, Embodiment 1 of the present invention will be described with reference to the drawings.
First, the battery 1 according to the first embodiment will be described with reference to FIG.
The battery 1 includes a belt-like positive electrode plate 30, a negative electrode plate 20, and a separator 50 that all extend in the longitudinal direction DA. The battery 1 is wound in the longitudinal direction DA to form a wound power generation element 10. This is a lithium ion secondary battery obtained by impregnating an electrolyte solution 60 containing lithium ions into the battery (see FIG. 1). In addition, the battery 1 accommodates the electric power generation element 10 in the battery case 80, as shown in FIG.

  The battery case 80 has a battery case body 81 and a sealing lid 82 both made of aluminum. Among these, the battery case main body 81 has a bottomed rectangular box shape, and an insulating film (not shown) made of resin and bent into a box shape is interposed between the battery case 80 and the power generation element 10. The sealing lid 82 has a rectangular plate shape, closes the opening of the battery case body 81, and is welded to the battery case body 81. Of the positive electrode current collecting member 91 and the negative electrode current collecting member 92 connected to the power generation element 10, the positive electrode terminal portion 91 </ b> A and the negative electrode terminal portion 92 </ b> A located at the tips of the sealing lid 82 pass through, respectively. 1 protrudes from the lid surface 82a facing upward. Insulating members 95 made of insulating resin are interposed between the positive electrode terminal portion 91A and the negative electrode terminal portion 92A and the sealing lid 82 to insulate each other. Further, a rectangular plate-shaped safety valve 97 is also sealed on the sealing lid 82.

In addition, the electrolytic solution 60 was prepared by adding LiPF ₆ as a solute to a mixed organic solvent in which ethylene carbonate (EC) and diethyl carbonate (DEC) were adjusted to EC: EMC = 3: 7 by volume ratio, and lithium ions were added. This is a non-aqueous electrolyte having a concentration of 1 mol / l.

  The power generation element 10 is a wound type in which a strip-like positive electrode plate 30 and a negative electrode plate 20 are wound into a flat shape via a strip-like separator 50 (see FIG. 1). In the power generation element 10, as shown in FIG. 4 (an enlarged cross-sectional view of the negative electrode plate 20 described later), the positive electrode active material layer 31 (described below) and the negative electrode of the positive electrode plate 30 are interposed via the separator 50. The negative electrode active material layer 21 (described later) of the plate 20 is opposed. Further, the positive electrode plate 30 and the negative electrode plate 20 of the power generation element 10 are respectively joined to a plate-like positive current collector 91 or negative current collector 92 bent in a crank shape (see FIG. 1). Among these, the strip-shaped separator 50 made of polyethylene is interposed between the positive electrode plate 30 and the negative electrode plate 20 to separate them. The separator 50 is entirely impregnated with the electrolytic solution 60 described above.

Further, as shown in the perspective view of FIG. 2, the positive electrode plate 30 has a belt-like shape extending in the longitudinal direction DA, and an aluminum foil 38 made of aluminum and both main surfaces of the aluminum foil 38 in the longitudinal direction DA. It has two positive electrode active material layers 31 and 31 arranged in an extending strip shape.
The positive electrode active material layer 31 includes positive electrode active material particles 37 made of LiCoO ₂ , a conductive material (not shown) made of acetylene black, and a binder (not shown) made of polyvinylidene fluoride (PVDF).

Further, as shown in the perspective view of FIG. 3, the negative electrode plate 20 has a strip-like copper foil 28 extending in the longitudinal direction DA and the main surfaces 28F and 28F of the copper foil 28 in the longitudinal direction DA. And two negative electrode active material layers 21 and 21 arranged in a strip shape extending in the vertical direction. In addition to these, a film-like insulating member 26 made of insulating polypropylene and interposed between a non-facing portion 23 (first non-facing portion 24) to be described later of the negative electrode active material layer 21 and the copper foil 28. (See FIG. 5).
Of these, the negative electrode active material layer 21 includes negative electrode active material particles 27 made of graphite and a binder (not shown) made of PVDF.

As shown in FIG. 3 and FIG. 4 of an enlarged cross-sectional view taken along the line AA in FIG. 3, the negative electrode active material layer 21 includes a facing portion 22 that faces the positive electrode active material layer 31 with a separator 50 interposed therebetween. It consists of a non-opposing portion 23 (a first non-opposing portion 24 and a second non-opposing portion 25 described below) in which the positive electrode active material layer 31 opposed via the separator 50 does not exist.
Specifically, the area of the negative electrode active material layer 21 is larger than the area of the opposed positive electrode active material layer 31, and the facing portion 22 is in each of the longitudinal direction DA and the width direction DB of the negative electrode active material layer 21. While located in the center, the non-opposing portion 23 is located in the vicinity adjacent to the opposing portion 22. For this reason, when the battery 1 is charged, it is possible to prevent metallic lithium from being deposited on the copper foil 28 located at the periphery of the negative electrode active material layer 21.

  The non-opposing portions 23 are two second non-opposing portions 25 and 25 located on both ends in the longitudinal direction DA of the negative electrode active material layer 21 and 2 located on both ends of the negative electrode active material layer 21 in the width direction DB, respectively. It consists of two first non-opposing parts 24, 24. The positions of the boundaries between the non-opposing portion 23 (the first non-opposing portion 24 and the second non-opposing portion 25) and the opposing portion 22 in the negative electrode active material layer 21 are the negative electrode plate 20, the separator 50, and the positive electrode plate 30. Is determined when the power generation element 10 is formed.

  Further, as shown in FIG. 4, the strip-shaped insulating members 26, 26 extending in the longitudinal direction DA are respectively disposed on the main surfaces 28 </ b> F, 28 </ b> F of the copper foil 28, and the first non-facing portion 24, the copper foil 28, It is interposed between.

  As described above, in the battery 1 according to the first embodiment, the negative electrode plate 20 includes the insulating member 26 interposed in at least a part between the non-facing portion 23 of the negative electrode active material layer 21 and the copper foil 28. ing. For this reason, in the first non-opposing portion 24 in which the insulating member 26 is interposed in the negative electrode active material layer 21, the exchange of electrons between the first non-opposing portion 24 and the copper foil 28 is suppressed. Can do. Therefore, the region of the non-opposing portion 23 into which lithium ions are inserted when the battery 1 is charged can be reduced by the amount of the insulating member 26 interposed, and a reduction in battery capacity can be suppressed.

  Further, the battery 1 includes the wound power generation element 10, and the insulating member 26 is interposed between the first non-facing portion 24 and the copper foil 28. For this reason, in the strip-shaped negative electrode active material layer 21 extending in the longitudinal direction DA, the first non-facing portion 24 occupies most of the non-facing portion 23. Therefore, by interposing the insulating member 26 here, when the battery 1 is charged, the lithium ions inserted into the non-opposing portion 23 can be greatly reduced, and the battery capacity can be sufficiently reduced. Can be suppressed.

Next, a method for manufacturing the battery 1 according to the first embodiment will be described.
First, the insulating member 26 was formed on the main surface 28F of the copper foil 28 of the negative electrode plate 20 by coating. Specifically, using two first die coaters DC1 in which softened polypropylene is stored inside itself as shown in FIG. Two strips of polypropylene forming the insulating member 26 were applied in a strip shape extending in the longitudinal direction DA at the positions where the facing portions 24, 24 were formed, and dried.

Next, a paste 21P forming the negative electrode active material layer 21 was applied to the copper foil 28 using the second die coater DC2 shown in FIG.
The second die coater DC2 includes a paste storage part DCT that stores the paste 21P therein, and a discharge port DCS that continuously discharges the paste 21P of the paste storage part DCT toward the copper foil 28.
Among these, the paste storage part DCT is a paste made by mixing and kneading the negative electrode active material particles made of graphite described above into N-methyl-2-pyrrolidone (NMP) in which the binder is dissolved. 21P is stored inside itself. Further, the discharge port DCS is slit-shaped and opens in parallel with the width direction DB. However, among the discharge ports DCS, the central discharge port DS1 at the center in the width direction DB is wider in the longitudinal direction DA than the end-side discharge ports DS2 at both ends in the width direction DB. That is, the first dimension S1 in the longitudinal direction DA of the central discharge port DS1 is larger than the second dimension S2 of the end-side discharge port DS2 (S1> S2). For this reason, the height of the paste 21P after application on the copper foil 28 can be made the same in the width direction DA regardless of the presence or absence of the insulating member 26 applied in advance.
Using such a second die coater DC2, the paste 21P was applied in a strip shape extending in the longitudinal direction DA on the copper foil 28 to which the insulating member 26 was applied (see FIG. 5).

After the paste 21P applied on the copper foil 28 was dried, the insulating member 26 and the paste 21P were similarly applied to the other main surface 28F of the copper foil 28 and dried.
Thereafter, the density is increased by a roll press (not shown), and when the negative electrode active material layer 21 and the negative electrode active material layer 21 are opposed to the positive electrode plate 30 via the separator 50, The negative electrode plate 20 which has the site | part which becomes and the insulating member 26 interposed between the copper foil 28 was produced (refer FIG. 3).

  On the other hand, a paste (not shown) formed by adding and kneading the positive electrode active material particles 37 and the conductive material into NMP in which the binder was dissolved was applied to a strip-shaped aluminum foil 38 extending in the longitudinal direction DA. After application, the paste on the aluminum foil 38 was dried. The paste was similarly applied to the back side of the aluminum foil 38 and dried. Then, the positive electrode plate 30 which compressed the paste dried on both the main surfaces of the aluminum foil 38 with the roll press which is not shown in figure was produced (refer FIG. 2).

  A power generation element 10 is obtained by winding the separator 50 between the negative electrode plate 20 and the positive electrode plate 30 manufactured as described above. The separator 50, the negative electrode plate 20, the separator 50, and the positive electrode active material layer 31 of the positive electrode plate 30 are opposed to the facing portion 22 of the negative electrode active material layer 21 of the negative electrode plate 20 with the separator 50 interposed therebetween. The positive electrode plates 30 are wound in order.

  Thereafter, the negative electrode collector member 92 and the positive electrode collector member 91 are welded to the negative electrode plate 20 (copper foil 28) and the positive electrode plate 30 (aluminum foil 38), respectively, inserted into the battery case body 81, and the above-described electrolysis is performed. After injecting the liquid 60, the battery case body 81 is sealed with a sealing lid 82 by welding. Thus, the battery 1 is completed (see FIG. 1).

(Modification 1)
Next, the battery 101 according to the first modification of the present invention will be described with reference to FIGS.
This battery 101 is different from the battery 1 according to Embodiment 1 described above in that it has a stacked power generation element in which a plurality of positive electrode plates and a plurality of negative electrode plates are alternately stacked via separators. The rest is the same.
Therefore, the description will be focused on differences from the battery 1 according to the first embodiment, and description of similar parts will be omitted or simplified. In addition, about the same part, the same effect is produced. In addition, the same contents are described with the same numbers.

  The battery 101 includes a rectangular plate-like positive electrode plate 130, a negative electrode plate 120, and a separator 150, and forms a stacked type power generation element 110 that is formed by alternately stacking these, and the separator 150 includes the first embodiment. 6 is a lithium ion secondary battery impregnated with the same electrolytic solution 60 (see FIG. 6). As shown in FIG. 6, the battery 101 includes the power generation element 110 accommodated in a battery case 80 similar to that of the first embodiment.

  Among them, the power generation element 110 is a stacked type in which the positive electrode plates 130 and the negative electrode plates 120 are alternately stacked via a strip-shaped separator 150 (see FIG. 6). Note that the positive electrode plate 130 and the negative electrode plate 120 of the power generation element 110 are joined to a plate-shaped positive current collector 91 or negative current collector 92 bent in a crank shape, respectively (see FIG. 6). Among these, the strip-shaped separator 150 made of polyethylene is interposed between the positive electrode plate 130 and the negative electrode plate 120 to separate them.

Further, as shown in the perspective view of FIG. 7, the positive electrode plate 130 is a rectangular plate-shaped aluminum foil 138 and two positive electrode active material layers respectively disposed on both main surfaces of the aluminum foil 138. 131, 131.
The positive electrode active material layer 131 includes the same positive electrode active material particles 37 as those in the first embodiment, a conductive material (not shown), and a binder (not shown).

On the other hand, as shown in the perspective view of FIG. 8, the negative electrode plate 120 is a rectangular plate-shaped copper foil 128 and two negative electrode active plates arranged on both main surfaces 128F and 128F of the copper foil 128, respectively. Material layers 121 and 121. In addition to these, there are two insulating members 126 and 126 made of insulating polypropylene and interposed between a non-facing portion 123 (described later) of the negative electrode active material layer 121 and a copper foil 128. Yes.
Among these, the negative electrode active material layer 121 includes the same negative electrode active material particles 27 and a binder (not shown) as those in the first embodiment.

As shown in FIG. 8, the negative electrode active material layer 121 has a facing portion 122 that faces the positive electrode active material layer 131 through the separator 150 and a non-facing surface in which the positive electrode active material layer 131 that faces through the separator 150 does not exist. Part 123.
Specifically, the area of the negative electrode active material layer 121 is larger than the area of the positive electrode active material layer 131 facing, and the non-opposing portion 123 is located on the periphery of the negative electrode active material layer 121. While facing the portion 123, the facing portion 122 is located at the center of the negative electrode active material layer 121. For this reason, when the battery 101 is charged, it is possible to prevent metallic lithium from being deposited on the copper foil 128 located at the periphery of the negative electrode active material layer 121.

  Further, the rectangular annular insulating member 126 is disposed on both main surfaces 128F and 128F of the copper foil 128, respectively, and is interposed between the non-facing portion 123 and the copper foil 128 (see FIG. 8). For this reason, in the part where the insulating member 126 is interposed in the negative electrode active material layer 121, that is, in the non-facing portion 123, exchange of electrons between the non-facing portion 123 and the copper foil 128 can be suppressed. . Therefore, since the insulating member 126 is interposed, the region of the non-facing portion 123 into which lithium ions are inserted when the battery 101 is charged can be eliminated, and a decrease in battery capacity can be suppressed.

Next, a method for manufacturing the battery 101 according to the first modification will be described.
First, the insulating member 126 was formed on the main surface 128F of the copper foil 128 of the negative electrode plate 120 by coating. Specifically, on the main surface 128F of the copper foil 128, the polypropylene forming the insulating member 126 is formed in a rectangular ring shape at a position where the non-facing portions 123, 123 of the negative electrode active material layer 121 are formed (see FIG. 8). It was applied and dried.

  Next, the same paste 21P as that of the first embodiment was applied on the copper foil 128 to which the insulating member 126 was applied. Specifically, the surface of the paste 21P after application is formed on the surface of the insulating member 126 applied to the copper foil 128 and on the main surface of the copper foil 128 exposed on the inner side surrounded by the insulating member 126. The paste 21P was applied so as to be flat and parallel to the copper foil 128.

After the paste 21P applied on the copper foil 128 was dried, the insulating member 126 and the paste 21P were similarly applied to the other main surface 128F of the copper foil 128 and dried.
Thereafter, the density is increased by a roll press (not shown), and a portion of the negative electrode active material layer 121 and the negative electrode active material layer 121 that becomes the non-opposing portion 123 when facing the positive electrode plate 130 via the separator 150. And the negative electrode plate 120 which has the insulating member 126 interposed between the copper foil 128 was produced (refer FIG. 8).

  On the other hand, a paste (not shown) formed by adding and kneading the positive electrode active material particles 37 and the conductive material into NMP in which the binder was dissolved was applied to the aluminum foil 138. After application, the paste on the aluminum foil 138 was dried. The paste was similarly applied to the back side of the aluminum foil 138 and dried. Then, the positive electrode board 130 which compressed the paste dried on both the main surfaces of the aluminum foil 138 with the roll press which is not shown in figure was produced (refer FIG. 7).

The negative electrode plate 120 and the positive electrode plate 130 manufactured as described above are laminated with the separator 150 interposed therebetween to form the power generation element 110. Specifically, the negative electrode plate 120, the separator 150, the positive electrode plate 130, and the separator 150 are repeated in this order so that the positive electrode active material layer 131 faces the facing portion 122 of the negative electrode active material layer 121 through the separator 150. Laminate.
Further, of the negative electrode plate 120 located on the outermost side in the stacking direction, the positive electrode active material is only formed on one main surface of the aluminum foil 138 through the separator 150 outside the negative electrode active material layer 121 exposed to the outside. A positive electrode plate (not shown) on which the material layer 131 is formed is disposed and laminated. On the other hand, a negative electrode plate (not shown) in which the negative electrode active material layer 121 is formed only on one main surface of the copper foil 128 is disposed and laminated outside the separator 150 located on the other outermost side in the lamination direction.
As a result, in all of the plurality of negative electrode plates 120, the stacked power generation element 110 is formed in which the positive electrode active material layer 131 is opposed to the facing portion 122 of the negative electrode active material layer 121 via the separator 150 (see FIG. 6). .

  Thereafter, the negative electrode current collecting member 92 and the positive electrode current collecting member 91 are welded to the negative electrode plate 120 (copper foil 128) and the positive electrode plate 130 (aluminum foil 138), respectively, inserted into the battery case body 81, and the electrolysis described above. After injecting the liquid 60, the battery case body 81 is sealed with a sealing lid 82 by welding. Thus, the battery 101 is completed (see FIG. 6).

(Embodiment 2)
A vehicle 200 according to the second embodiment is equipped with a battery pack 210 including a plurality of the batteries 1 and 101 described above. Specifically, as shown in FIG. 9, vehicle 200 is a hybrid vehicle that is driven by using engine 240, front motor 220, and rear motor 230 in combination. The vehicle 200 includes a vehicle body 290, an engine 240, a front motor 220, a rear motor 230, a cable 250, an inverter 260, and a battery pack 210 having a rectangular box shape. Among these, the battery pack 210 contains a plurality of the above-described batteries 1 and 101.

  Since the vehicle 200 according to the second embodiment is equipped with the batteries 1 and 101 that suppress the decrease in battery capacity, the vehicle 200 having a power source with stable performance can be obtained.

(Embodiment 3)
Further, the hammer drill 300 of the third embodiment is equipped with the battery pack 310 including the batteries 1 and 101 described above, and is a battery-equipped device having the battery pack 310 and the main body 320 as shown in FIG. . Note that the battery pack 310 is accommodated in the bottom portion 321 of the main body 320 of the hammer drill 300.

  Since the hammer drill 300 according to the third embodiment is equipped with the batteries 1 and 101 in which the decrease in battery capacity is suppressed, it can be a battery-equipped device having a drive energy source with stable performance.

In the above, the present invention has been described with reference to the first to third embodiments and the first modified embodiment, but the present invention is not limited to the above-described embodiments, and can be appropriately modified and applied without departing from the gist thereof. Needless to say, you can.
For example, in Embodiment 1 and Modification 1, an insulating member made of polypropylene is used. However, for example, a polyolefin resin such as polyethylene, a solid resin that does not have through holes, and a metal such as aluminum oxide. It may be an oxide. In the first embodiment, the insulating member is interposed only in the first non-facing portion 24 of the non-facing portion 23. For example, the insulating member is also used for the second non-facing portion 25 together with the first non-facing portion 24. May be interposed. In this case, the region of the non-facing portion 23 into which lithium ions are inserted when the battery is charged can be eliminated.

1,101 battery (lithium ion secondary battery)
10,110 Power generation element (winding power generation element)
20, 120 Negative electrode plates 21, 121 Negative electrode active material layers 22, 122 Opposing portions 23, 123 Non-opposing portions 24 First non-opposing portions (width direction end side non-opposing portions)
26, 126 Insulating member 27 Negative electrode active material particles 28, 128 Copper foil (negative electrode current collector plate)
30, 130 Positive electrode plates 31, 131 Positive electrode active material layer 37 Positive electrode active material particles 38, 138 Aluminum foil (positive electrode current collector plate)
50 Separator 200 Vehicle 300 Hammer drill (Battery-equipped equipment)
DA Longitudinal direction DB Width direction

Claims (4)

A positive electrode current collector plate having conductivity, and a positive electrode plate having a positive electrode active material layer including positive electrode active material particles and disposed on the positive electrode current collector plate;
A negative electrode current collector plate having conductivity, and a negative electrode plate having a negative electrode active material layer including negative electrode active material particles and disposed on the negative electrode current collector plate;
A separator formed between the positive electrode plate and the negative electrode plate,
A lithium ion secondary battery in which the positive electrode active material layer and the negative electrode active material layer face each other through the separator,
The negative electrode active material layer is
A facing portion facing the positive electrode active material layer via the separator;
A non-facing portion where the positive electrode active material layer facing through the separator does not exist,
The negative electrode plate is
The lithium ion secondary battery which has an insulating insulating member interposed in at least one part between the said non-opposing part of the said negative electrode active material layer, and the said negative electrode current collecting plate. The lithium ion secondary battery according to claim 1,
The strip-like positive electrode plate, the negative electrode plate, and the separator, all extending in the longitudinal direction,
Wound in the longitudinal direction to form a wound power generation element,
Of the strip-shaped negative electrode active material layer extending in the longitudinal direction, the non-facing portion is
Including width direction end side non-opposing portions respectively positioned on both ends of the width direction orthogonal to the longitudinal direction,
The insulating member is
A lithium ion secondary battery having a strip shape extending in the longitudinal direction and interposed between the width direction end side non-opposing portion and the negative electrode current collector plate. A vehicle equipped with the lithium ion secondary battery according to claim 1 or 2 and using electric energy stored in the lithium ion secondary battery as a whole or a part of a power source. A battery-equipped device in which the lithium ion secondary battery according to claim 1 or 2 is mounted and electric energy stored in the lithium ion secondary battery is used for all or a part of a drive energy source.

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