JP2012043752A - Secondary battery and vehicle mounted with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a secondary battery which can prevent a short circuit even if the temperature of the battery is raised by overcharge or the like in the secondary battery having portions where a collector is exposed at end parts of electrode plates and having an electrode body where the portions are protruded in a direction opposite to each other, and to provide a vehicle mounted with the secondary battery.SOLUTION: In a secondary battery 1, a first end part of a separator is protruded from a negative electrode plate, a positive electrode current collector is further protruded from the first end part of the separator, a second end part of the separator is protruded from a positive electrode plate, and a negative electrode current collector is further protruded from the second end part of the separator. The protrusion amount of the first end part of the separator from the negative electrode plate at a positive electrode non-coated portion side end part is two times or more of the protrusion amount of the second end part of the separator from the positive electrode plate at a negative electrode non-coated portion side end part of the electrode body, and the protrusion amount of the second end part of the separator from the positive electrode plate in the negative electrode non-coated portion side end part of the electrode body is 3 mm or more.

Description

  The present invention relates to a secondary battery having a positive electrode plate, a negative electrode plate, and a separator, and a vehicle equipped with the same.

  Conventionally, a secondary battery having an electrode body formed by laminating or winding a positive electrode plate, a negative electrode plate, and a separator is known. Examples of such a battery include a lithium ion secondary battery. As a positive electrode plate and a negative electrode plate of the secondary battery, those obtained by coating an electrode mixture layer containing an active material on both surfaces of a current collector made of metal foil are widely used. As the separator, a polyolefin microporous film is widely used. In particular, a PP (polypropylene) / PE (polyethylene) / PP three-layer structure having a shutdown function is preferably used.

  Materials such as PP and PE used for the separator contract to some extent due to heat. That is, when the temperature of the battery is increased due to overcharging or the like, the end of the separator is retracted due to thermal contraction. For this reason, the arrangement of the end portions of the separator is determined with a margin so that the positive and negative electrode plates do not short-circuit even when the separator contracts. However, although the larger the separator, the safer it is, we do not want to make it excessively large from practical conditions such as battery capacity and external dimensions. Therefore, it has been desired to grasp the minimum size of the separator within a range that can ensure safety.

  For example, Patent Document 1 discloses that the distance from the end of the current collector to the end of the separator is 3 with respect to the electrode plate coated with the active material leaving at least 4 mm from the end of the current collector. A secondary battery of 5 mm or more is disclosed. Thereby, even if it receives the heat | fever at the time of welding an electrode terminal to the edge part of an electrical power collector, it is supposed that a separator will not shrink | contract so that an insulation defect may generate | occur | produce. Further, for example, Patent Document 2 discloses the relationship between the thermal contraction rate of the separator and the size of the positive and negative electrode plates in the battery. In this document, in a battery in which the negative electrode plate is larger than the positive electrode plate in both length and width, the material of each member or the like is maintained so that the size of the separator after heat shrinkage is maintained larger than the size of the positive electrode plate. It is supposed to select the size.

JP 2004-253253 A JP 2003-217664 A

  However, in the technique of Patent Document 1 described above, only the heat due to welding of one electrode terminal is targeted. The positional relationship between the end of the electrode plate connected to the other electrode terminal and the end of the separator is not defined. For this reason, after manufacturing as a battery, it cannot be said that measures are taken against heat generated during use due to overcharge or the like. In other words, the completed secondary battery has a problem that the insulation state may be insufficient when the separator is excessively heat-shrinked.

  Further, the technique described in Patent Document 2 described above is specialized in a battery in which the negative electrode plate is larger in both length and width than the positive electrode plate. In other words, the conditions of this document cannot be applied as they are to batteries having different electrode plate shapes. The object of the present application is a battery in which an uncoated portion is left at the end portion of the electrode plate, which protrudes in a different direction and is connected to the electrode terminal. Therefore, a separator size condition suitable for this type of battery has been desired.

  The present invention has been made to solve the problems of the conventional secondary battery described above. That is, the problem is that in the secondary battery having the electrode body in which the current collector is left exposed at the end of the electrode plate and the parts are protruded in the opposite directions, overcharge, etc. Accordingly, it is an object of the present invention to provide a secondary battery that is prevented from being short-circuited even if the temperature of the battery is increased, and a vehicle equipped with the secondary battery.

  The secondary battery of the present invention, which has been made for the purpose of solving this problem, is obtained by partially coating the positive electrode current collector layer with the positive electrode mixture layer, and without applying the positive electrode mixture layer to the positive electrode non-coating layer. A part of the negative electrode mixture layer is applied to the negative electrode current collector and the positive electrode plate, which is the positive electrode coating part where the positive electrode mixture layer is applied. In addition, a negative electrode non-coated portion not coated with a negative electrode mixture layer is provided on the other end side, and the remaining portion is a negative electrode coated portion coated with a negative electrode mixture layer A negative electrode plate and a separator that insulates the positive electrode plate and the negative electrode plate, the positive electrode plate, the negative electrode plate, and the separator so that the positive electrode non-coated portion and the negative electrode non-coated portion protrude in opposite directions. A secondary battery having an electrode stack formed by stacking or winding, the first end of the separator at the positive electrode non-coating portion side end of the electrode stack Is protruded from both the boundary between the positive electrode coated portion and the positive electrode non-coated portion and the end portion of the negative electrode coated portion, and the end portion of the positive electrode non-coated portion is the first end portion of the separator. The second end of the separator at the end of the electrode laminate on the side of the negative electrode non-coating portion is the boundary between the negative electrode coating portion and the negative electrode non-coating portion, and the positive electrode coating portion. And the end of the negative electrode non-coated part further protrudes than the second end of the separator, and the separator has a positive electrode non-coated part side end of the electrode laminate. The amount of protrusion from the end of the negative electrode coating portion of the first end is the amount of protrusion from the end of the positive electrode coating portion of the second end of the separator at the negative electrode non-coating portion side end of the electrode laminate. 2 or more times, protruding from the end of the positive electrode coating portion of the second end of the separator at the negative electrode non-coating portion side end of the electrode laminate There are those is 3mm or more.

  The secondary battery of the present invention is a secondary battery having an electrode body in which the portions where the current collector is exposed are left at the end portions of the electrode plate and the portions are protruded in opposite directions. According to the present invention, the first end of the separator is disposed on the exposed side of the positive electrode current collector, and the second end of the separator is disposed on the exposed side of the negative electrode current collector. The amount of protrusion of the first end of the separator from the end of the negative electrode coating portion corresponds to the margin of the separator on the positive electrode terminal side, and the protrusion of the second end of the separator from the end of the positive electrode coating portion. The amount corresponds to the margin of the separator on the negative electrode terminal side. The present inventor has found that such a secondary battery tends to be heated from the negative electrode side on the positive electrode side. In the secondary battery of the present invention, since the protruding amount on the first end side of the separator is set to be twice or more the protruding amount on the second end side of the separator, even if the temperature rises, a short circuit is appropriately prevented. ing. Furthermore, when the protrusion amount on the second end side of the separator is 3 mm or more, a short circuit can be prevented more reliably.

  Furthermore, in the present invention, it is desirable that the width of the positive electrode non-coated portion is larger than the width of the negative electrode non-coated portion. If it has become like this, an electrode terminal can be appropriately attached to each non-coating part, respectively.

  Furthermore, the present invention extends to a vehicle equipped with the above-described secondary battery.

  According to the secondary battery of the present invention and the vehicle on which the secondary battery is mounted, the electrode body has an electrode body in which the current collector is left exposed at the end of the electrode plate and the portions are protruded in opposite directions. In the secondary battery, even if the temperature of the battery is increased due to overcharge or the like, a short circuit is prevented.

It is a schematic block diagram which shows the secondary battery which concerns on this form. It is explanatory drawing which shows the positional relationship of a positive electrode plate, a negative electrode plate, and a separator. It is sectional drawing which shows the positional relationship of a positive electrode plate, a negative electrode plate, and a separator. It is explanatory drawing which shows the vehicle carrying the secondary battery which concerns on this form.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the best mode for embodying the present invention will be described in detail with reference to the accompanying drawings. In this embodiment, the present invention is applied to a wound type lithium ion secondary battery.

  As shown in FIG. 1, the secondary battery 1 according to this embodiment is a lithium ion secondary battery in which an electrode body 12 and an electrolytic solution 13 are enclosed in an aluminum case 11. As will be described later, the electrode body 12 is formed by stacking a positive electrode plate, a negative electrode plate, and a separator. In the secondary battery 1 of the present embodiment, the electrode body 12 has a flat shape in a direction perpendicular to the winding axis, and is inserted into a flat rectangular aluminum case 11.

  As shown in FIG. 2, the electrode body 12 of the secondary battery 1 of this embodiment includes a positive electrode plate 21, a negative electrode plate 22, and two separators 23. Both are strip-like members that are long in the vertical direction (hereinafter referred to as the longitudinal direction) in the drawing. As shown in the drawing, these are wound together along a winding axis facing in the width direction in a state where they are overlapped little by little in the left-right direction (hereinafter referred to as the width direction) in the figure.

The electrolyte solution 13 of this embodiment is obtained by dissolving an electrolyte in an organic solvent. Examples of organic solvents include ester solvents such as propylene carbonate (PC), ethylene carbonate (EC), dimethyl carbonate (DMC), and methyl ethyl carbonate (MEC), ester solvents such as γ-butylactone (γ-BL), An organic solvent containing an ether solvent such as ethoxyethane (DEE) can be used. In addition, as a salt that is an electrolyte, lithium salts such as lithium perchlorate (LiClO ₄ ), lithium borofluoride (LiBF ₄ ), and lithium hexafluorophosphate (LiPF ₆ ) can be used.

The positive electrode plate 21 is obtained by applying a positive electrode mixture containing a positive electrode active material capable of inserting and extracting lithium ions on both surfaces of a positive electrode current collector 31 made of an aluminum foil or an aluminum alloy foil. As the positive electrode active material, for example, lithium composite oxides such as lithium nickelate (LiNiO ₂ ), lithium manganate (LiMn ₂ O ₄ ), and lithium cobaltate (LiCoO ₂ ) are used. The positive electrode mixture layer 32 is formed by drying and pressing the positive electrode mixture. The positive electrode mixture layer 32 is not provided over the entire surface of the positive electrode current collector 31 in the width direction. One side (left side in the figure) is provided up to the end of the positive electrode current collector 31, but the other side (right side in the figure) is provided leaving a little end part of the positive electrode current collector 31. That is, both sides of the positive electrode current collector 31 are exposed with a certain width at the right end of the positive electrode plate 21 in the drawing.

  The negative electrode plate 22 of this embodiment is obtained by applying a negative electrode mixture of a negative electrode active material capable of occluding and releasing lithium ions to both surfaces of a negative electrode current collector 41 made of copper foil or copper alloy foil. Examples of the negative electrode active material include carbon-based materials such as amorphous carbon, non-graphitizable carbon, graphitizable carbon, and graphite. The negative electrode mixture layer 42 is formed by drying and pressing the negative electrode mixture. The negative electrode mixture layer 42 is not provided on the entire surface in the width direction. At the left end of the negative electrode plate 22 in the figure, both sides of the negative electrode current collector 41 are exposed with a certain width.

  The separator 23 is a resin microporous film having appropriate electrical insulation, mechanical strength, and ion permeability. For example, a material having a so-called shutdown function made of a PP / PE / PP composite material is preferably used. For example, it is desirable to use a material having a thickness of 10 to 30 μm. The two separators 23 are made of the same material and are arranged at the same position in the width direction.

  The cross-sectional view of FIG. 3 shows the positional relationship in the width direction of each member in the electrode body 12 of the secondary battery 1 of this embodiment. In the drawing, the left-right direction is the width direction, which corresponds to the left-right direction in FIGS. In this figure, the thickness with respect to the width of each member is considerably increased for easy understanding, and each member is illustrated with a little separation.

  The positive electrode plate 21 is obtained by forming a positive electrode mixture layer 32 having a width A on a positive electrode current collector 31 having a width (A + B). Therefore, the positive electrode mixture layer 32 having the width A is the positive electrode coating portion, and the positive electrode current collector 31 is exposed over the width B to form the positive electrode non-coating portion 33. The negative electrode plate 22 is obtained by forming a negative electrode mixture layer 42 having a width D on a negative electrode current collector 41 having a width (D + E). Therefore, the negative electrode mixture layer 42 having a width D is a negative electrode coating portion, and the negative electrode current collector 41 is exposed over the width E to form a negative electrode non-coating portion 43.

  Here, the width D of the negative electrode mixture layer 42 is larger than the width A of the positive electrode mixture layer 32. The negative electrode mixture layer 42 reaches the outside of the positive electrode mixture layer 32 at both ends in the width direction. The width C of the separator 23 is larger than the width D of the negative electrode mixture layer 42 as shown in FIG. The separators 23 protrude further outward than the negative electrode mixture layer 42 on both sides in the width direction.

  Thereby, the separator 23 has completely covered the range which exists in either the mixture layer (positive electrode coating part) of the positive electrode plate 21, and the mixture layer (negative electrode coating part) of the negative electrode plate 22. . Further, the positive electrode current collector 31 protrudes from the right end of the separator 23 to the right in the drawing. This protruding portion is a positive electrode protruding portion 34, and a positive electrode terminal is connected to this portion. Further, the negative electrode current collector 41 protrudes from the left end of the separator 23 in the drawing to the left in the drawing. This protruding portion is a negative electrode protruding portion 44, and a negative electrode terminal is connected to this portion.

  In such a case, as shown in FIG. 3, the width of the separator 23 in which the right end in the drawing protrudes to the right in the drawing from the right end in the drawing of the negative electrode plate 22 is the first protruding width W <b> 1. Further, the width of the separator 23 that protrudes from the left end of the positive electrode plate 21 to the left side of the drawing in the drawing is the second protruding width W2. These protrusion widths W1 and W2 are the widths of portions of the separator 23 that protrude outward from the overlapping range W3 of the positive electrode plate 21 and the negative electrode plate 22, respectively.

  In this embodiment, the first protrusion width W1 is twice or more the second protrusion width W2. Furthermore, as a width allowing for safety, the second protrusion width W2 is preferably 3.0 mm or more. In this way, the insulation state between the positive and negative electrode plates 21 and 22 can be reliably maintained even when the battery is heated.

  In a battery of the same type as the secondary battery 1 of the present embodiment, heat may be generated inside due to overcharge, for example. It has been found that this generated heat is particularly likely to accumulate on the inner peripheral side of the winding. Further, the inventors have a higher temperature on the side where the positive electrode current collector 31 is exposed (right side in FIG. 3) than on the side where the negative electrode current collector 41 is exposed (left side in FIG. 3). I found that it is prone. The amount of shrinkage due to heat of the separator 23 increases as the ultimate temperature increases. Therefore, when such heat generation occurs, the separator 23 has an end portion on the right side in the drawing (hereinafter referred to as the second end portion 23L) at the right end portion in the drawing (hereinafter referred to as the first end portion 23R). ) It will shrink more greatly.

  Therefore, in order to expect the same safety width, the first protrusion width W1 on the first end portion 23R side needs to be equal to or more than twice the second protrusion width W2 on the second end portion 23L side. I understood that. In other words, the second protrusion width W2 can be about half of the first protrusion width W1. However, in order to connect the respective electrode terminals, the positive electrode protruding portion 34 and the negative electrode protruding portion 44 are required to have the same degree. Therefore, the width B of the positive electrode uncoated portion 33 of the positive electrode current collector 31 needs to be larger than the width E of the negative electrode uncoated portion 43 of the negative electrode current collector 41.

  The present inventors conducted an experiment to obtain the minimum necessary length as the first protrusion width W1 and the second protrusion width W2 in the secondary battery 1 of the present embodiment. In this experiment, the following positive electrode plate 21, negative electrode plate 22, and separator 23 were used and arranged as shown in FIG. 3, and the secondary batteries of Examples and Comparative Examples 1 to 3 were manufactured. However, in each example, the size and arrangement of the positive electrode plate 21 and the negative electrode plate 22 were fixed, and the width C of the separator 23 and its arrangement (W1 and W2) were changed. The rated capacity of these secondary batteries was 4.6 Ah.

The positive electrode plate 21 of this experiment was manufactured as follows. LiNiCoAlO ₂ composite oxide was used as the positive electrode active material, and 5 parts by weight of the conductive material AB (acetylene black) and the binder PVdF (polyvinylidene fluoride) were added to 100 parts by weight of the active material, respectively. did. An aluminum foil having a thickness of 15 μm and a width of 68 mm was used as the current collector 31. The positive electrode mixture layer 32 was formed in the range of a width of 50 mm from one end. Therefore, the exposed positive electrode current collector 31 has a width of 18 mm. In this way, a positive electrode plate 21 having a thickness of 100 μm and a length of 3000 mm was manufactured.

  Moreover, the negative electrode plate 22 of this experiment was manufactured as follows. Graphite was used as the negative electrode active material, and 7 parts by weight of binder PVdF was added to 100 parts by weight of the active material to obtain a negative electrode mixture. A copper foil having a thickness of 10 μm and a width of 65 mm was used as the negative electrode current collector 41. The negative electrode mixture layer 42 was formed in a range of 54 mm in width from one end. Thus, a negative electrode plate 22 having a thickness of 120 μm and a length of 3300 mm was manufactured. Further, as the separator 23, a polyolefin separator having a PP / PE / PP3 layer thickness of 20 μm was used.

  The positive electrode plate 21, the negative electrode plate 22, and the separator 23 manufactured as described above were stacked, wound and molded, and sealed in a battery case. At this time, the first protrusion width W1 and the second protrusion width W2 were overlapped so as to have the values shown below. The case used was a case that was destroyed when the internal pressure rose above a certain level and was provided with a safety valve to release the gas to the outside.

In this experiment, it was assumed that only the example satisfied the conditions of W1 ≧ W2 × 2, and W2 ≧ 3 mm. In Comparative Examples 1 and 2, W2 ≧ 3 mm, but W1 <W2 × 2. In Comparative Example 3, W1 ≧ W2 × 2 but W2 <3 mm. Specifically, it was as follows.
Example: W1 = 6 mm, W2 = 3 mm
Comparative Example 1: W1 = 3 mm, W2 = 3 mm
Comparative Example 2: W1 = 5 mm, W2 = 3 mm
Comparative Example 3: W1 = 4 mm, W2 = 2 mm

  An overcharge test was performed on these examples and comparative examples 1 to 3 under the following conditions. The battery in an SOC of 30% was continuously charged with a constant current of 46 A (corresponding to 10 C). The battery was charged to an overcharged state with an upper limit voltage of 20V. The environmental temperature was 60 ° C. The surface temperature and battery voltage at the center of the side surface of the battery case during charging were monitored. We also observed the presence of phenomena such as opening of the safety valve and smoke.

  The results in the examples were as follows. When the SOC was charged to around 140%, the safety valve opened. When the battery was further charged, the separator was shut down at around SOC 160%, reaching the upper limit of 20V, and the current value was almost 0A. The maximum temperature reached on the battery surface was 102 ° C. The temperature gradually decreased after the shutdown. In addition, no smoke was observed.

  Furthermore, the batteries of the examples were disassembled after the test was completed, and the internal state was observed. The separator 23 was contracted by heat and contracted particularly greatly on the inner peripheral side of the wound electrode body 12. At the largest point, the first protrusion width W1 contracted by about 3 mm and the second protrusion width W2 contracted by about 1 mm. There was no short circuit between the positive and negative electrodes.

  On the other hand, the results of performing continuous charging similar to the example for Comparative Examples 1 to 3 were as follows. The process from the opening of the safety valve to the shutdown of the separator was the same as in the example. However, a few seconds after the current value became almost 0 A, the surface temperature of the battery increased rapidly and exceeded 300 ° C. In the examples, it reached about 200 ° C. even higher than that up to 102 ° C. In addition, smoke-like exhaust was seen from the opening of the safety valve. In other words, a short circuit occurred after shutdown due to the shrinkage of the separator.

  As can be seen from this experiment, the first protrusion width W1 is preferably at least twice the second protrusion width W2. Further, in the secondary battery of this material and size, it is desirable that the second protrusion width W2 is 3 mm or more. Therefore, in this secondary battery, the first protrusion width W1 is preferably 6 mm or more.

  Note that the secondary battery 1 of the present embodiment can be mounted on a hybrid vehicle or other vehicles. FIG. 4 shows a hybrid vehicle 100 equipped with the secondary battery 1 of this embodiment. In this hybrid vehicle 100, an engine 3, a motor 4, a battery pack 5, and a controller 6 are mounted on a vehicle body 2. The battery pack 5, the motor 4 and the controller 6 are connected by a cable 7. A plurality of secondary batteries 1 are built in the battery pack 5.

  The hybrid vehicle 100 uses the engine 3 and the motor 4 together to drive the wheels. In the hybrid vehicle 100 of the present embodiment, a battery discharge current is supplied from the battery pack 5 to the motor 4 so that the motor 4 generates power. Depending on the traveling state of the hybrid vehicle 100, regenerative electric power may be generated by the motor 4. Thereby, a charging current is supplied to the battery of the battery pack 5, and the battery is charged. Here, the controller 6 controls the exchange of current between the battery pack 5 and the motor 4.

  The vehicle of the present embodiment is not limited to a hybrid vehicle as long as the vehicle uses electric energy from a battery for all or a part of its power source. For example, an electric vehicle, a plug-in hybrid vehicle, a hybrid railway vehicle, a forklift, an electric wheelchair, an electric assist bicycle, an electric scooter, etc. may be used.

  As described above in detail, the secondary battery 1 of the present embodiment includes the positive electrode plate 21 in which the positive electrode mixture layer 32 is formed on both surfaces of the positive electrode current collector 31 and the negative electrode mixture on both surfaces of the negative electrode current collector 41. A negative electrode plate 22 on which a layer 42 is formed. Each electrode plate has a portion where the current collector is exposed at one end in the width direction. Further, the positive electrode plate 21 and the negative electrode plate 22 are overlapped and wound with the exposed portions of the current collector protruding in opposite directions. Further, a separator 23 is sandwiched between the positive electrode plate 21 and the negative electrode plate 22. In such a configuration, the first protruding width W1 in which the first end 23R of the separator 23 protrudes from the end of the negative electrode plate 22 in the width direction is the first protruding width W1 and the second end 23L of the separator 23 is in the width direction of the positive electrode plate 21. It is 2 times or more of the 2nd protrusion width W2 which protrudes more. This prevents a short circuit even if the battery is heated due to overcharging or the like.

In addition, this form is only a mere illustration and does not limit this invention at all. Therefore, the present invention can naturally be improved and modified in various ways without departing from the gist thereof.
For example, although a wound type secondary battery is used in this embodiment, a stacked type battery can be applied as long as a current collector is protruded on both sides and stacked.

DESCRIPTION OF SYMBOLS 1 Secondary battery 12 Electrode body 21 Positive electrode plate 22 Negative electrode plate 23 Separator 23R 1st edge part 23L 2nd edge part 31 Positive electrode collector 32 Positive electrode mixture layer 41 Negative electrode collector 42 Negative electrode mixture layer

Claims (3)

A positive electrode mixture layer is partially coated on the positive electrode current collector, and has a positive electrode non-coated portion on which the positive electrode mixture layer is not coated on one end side. A positive electrode plate, which is a positive electrode coating portion coated with a material layer, and a negative electrode mixture layer partially coated on a negative electrode current collector and a negative electrode non-coated with no negative electrode material mixture layer A negative electrode plate that is a negative electrode coating part having a negative electrode coating layer coated with a negative electrode mixture layer, and a separator that insulates the positive electrode plate and the negative electrode plate; An electrode laminate in which the positive electrode plate, the negative electrode plate, and the separator are stacked or wound so that the positive electrode non-coated portion and the negative electrode non-coated portion protrude in opposite directions to each other. A secondary battery having
At the positive electrode non-coated part side end of the electrode laminate,
The first end portion of the separator protrudes from both the boundary between the positive electrode coating portion and the positive electrode non-coating portion and the end portion of the negative electrode coating portion,
The end of the positive electrode non-coating portion protrudes further than the first end of the separator;
At the negative electrode non-coated part side end of the electrode laminate,
The second end of the separator protrudes from both the boundary between the negative electrode coating part and the negative electrode non-coating part and the end of the positive electrode coating part,
An end of the negative electrode non-coating portion protrudes further than a second end of the separator;
The protruding amount of the first end of the separator from the end of the negative electrode coating portion at the positive electrode non-coating portion side end of the electrode laminate is the negative electrode non-coating portion side end of the electrode laminate. More than twice the amount of protrusion of the second end of the separator in the part from the end of the positive electrode coating part,
A secondary battery, wherein a protruding amount of the second end portion of the separator from an end portion of the positive electrode coating portion at the negative electrode non-coating portion side end portion of the electrode laminate is 3 mm or more. The secondary battery according to claim 1,
A secondary battery, wherein a width of the positive electrode non-coated portion is larger than a width of the negative electrode non-coated portion. A vehicle equipped with the secondary battery according to claim 1.

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