JPH11307127A - Laminated battery electrode - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure sufficient volume energy density, to cope with the realization of higher capacity and to improve productivity. SOLUTION: When a plurality of electrode pairs each composed by laminating a positive electrode having a quadrilateral plane form and a negative electrode having a quadrilateral form via a separator having a quadrilateral form parallelogram are laminated, one side of each of the quadrilaterals of the same kind of layers in at least one kind of the positive electrode, the negative electrode and the separator of the electrode pair adjacent to each other are connected together. It is preferable that one side of each of the quadrilaterals of the negative electrodes of the electrode pairs adjacent to each other are connected together. In each of the electrode pairs is composed by forming the negative electrode 1 as one sheet, arranging a divided positive electrode 3a or the like on it and folding them, one side of each of the quadrilaterals of the negative electrodes 1 to the electrode pairs adjacent to each other are connected together.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a laminated battery electrode.

[0002]

2. Description of the Related Art Conventionally, nickel-cadmium batteries and lead batteries have been used as secondary batteries for electronic equipment. However, in recent years, with the advancement of electronic technology, the performance, size, and portability of electronic devices have advanced, and the demand for higher energy density of secondary batteries for electronic devices has increased. In a cadmium battery, a lead battery, and the like, there has been a problem that the discharge voltage is low and the energy density cannot be sufficiently increased.

Therefore, as a secondary battery having a high volume energy density, a high discharge voltage, a small self-discharge, and a long cycle life, a nickel-cadmium battery or a lead battery has recently been replaced with a carbon material for the negative electrode. Non-aqueous electrolyte secondary batteries using lithium composite oxides such as lithium-cobalt composite oxide for the positive electrode using substances capable of doping and undoping lithium ions have been actively researched and developed. .

[0004]

With the further miniaturization of portable electronic devices such as mobile phones in which such a non-aqueous electrolyte secondary battery is used, the above-mentioned non-aqueous electrolyte secondary battery has It is desired that the shape be square.

[0005] To manufacture this rectangular non-aqueous electrolyte secondary battery, a wound battery electrode or a laminated battery electrode is prepared as an electrode and is housed in a rectangular battery can.

The above-mentioned wound battery electrode is formed by laminating a strip-shaped negative electrode and a strip-shaped positive electrode with a strip-shaped separator interposed therebetween and spirally winding them. Therefore, when this wound battery electrode is housed in a rectangular battery can, a gap is formed between the corner of the battery can and the end of the wound battery electrode, and the volume energy density is reduced accordingly. It is difficult to achieve higher capacity. Also, although easy to manufacture,
There is a disadvantage that the electrode is distorted and a short circuit or the like is likely to occur.

In the above-mentioned laminated battery electrode, a pair of negative electrodes in which a negative electrode mixture layer is formed on one surface of a negative electrode current collector are prepared, and a positive electrode in which a positive electrode mixture layer is formed on both surfaces of a positive electrode current collector is prepared. And
The negative electrodes are opposed to each other so that the negative electrode mixture layers face each other, a single cell having a positive electrode sandwiched between the negative electrode mixture layers with a separator interposed therebetween is formed, and a plurality of the single cells are stacked. In the single cell, a negative electrode, a separator, a positive electrode, a separator, and a negative electrode are sequentially stacked. When the stacked battery electrode is housed in a rectangular battery can, a gap is hardly formed between the electrode and the battery can, and from this point, the volume energy density is improved.

However, in this laminated battery electrode, it is necessary to lead out from each layer in a unit of single cell. For this reason, the volume energy density is reduced by the amount of the lead, and it is difficult to further increase the capacity.

In addition, since the above-mentioned laminated battery electrode is manufactured through various steps such as cutting out leads for each layer, manufacturing single cells, laminating single cells, and welding connection of leads of each layer, it is manufactured. The production cost becomes high, and the productivity is not good.

Further, in the above-mentioned laminated battery electrode,
If a position shift occurs during the fabrication of a single cell, there is a disadvantage that a short circuit or the like easily occurs at that position.

The present invention has been proposed in view of the conventional situation, and has a sufficient volume energy density, is capable of coping with a higher capacity, and has a good productivity. It is intended to provide a battery electrode.

[0012]

In order to solve the above-mentioned problems, a stacked battery electrode according to the present invention comprises a plane quadrilateral positive electrode and a plane quadrilateral negative electrode interposed through a plane quadrilateral separator. A stacked battery electrode in which a plurality of stacked electrode pairs are stacked, and at least one of the positive electrode, the negative electrode, and the separator of an adjacent electrode pair, one side of a plane quadrilateral of the same layer is connected. It is characterized by having.

In the above-mentioned laminated battery electrode of the present invention, the electrode pair may be one of the above-mentioned positive electrode, negative electrode and separator in which one side of a plane quadrilateral of the same kind of layer is connected in an adjacent pair of electrodes. In the case where the uppermost layer in the stacking direction is the first layer, it is an odd number layer, and 1 ≦
In the n-th layer that satisfies the relationship n <(m−2), one side connected to an adjacent layer of the same type and one side adjacent thereto are also connected to the (n + 3) -th layer of the same type. Is also good.

In the above-mentioned laminated battery electrode of the present invention, the positive electrode, the negative electrode, and the separator, in which one side of a plane quadrilateral of the same kind of layer is connected to an adjacent pair of electrodes, In the layer that is the uppermost layer and the lowermost layer in the stacking direction, only one side is connected to the same type of adjacent layer, and in the layer sandwiched between the uppermost layer and the lowermost layer, two adjacent sides are adjacent to each other. May be connected to each other.

Further, in the above-mentioned stacked battery electrode of the present invention, it is preferable that one side of a plane quadrilateral of the negative electrode be connected to the adjacent electrode pair.

In the laminated battery electrode according to the present invention,
The positive electrode that forms a plane quadrilateral and the negative electrode that forms a plane quadrilateral are configured to stack a plurality of electrode pairs that are stacked via a separator that forms a plane quadrilateral, and the positive electrode of an adjacent electrode pair,
In at least one of the negative electrode and the separator, one side of a planar quadrilateral of the same layer is connected to each other. That is, in the negative electrode and / or the positive electrode, if one side of a plane quadrilateral of the same layer is connected to each other, each layer becomes continuous, so that it is not necessary to form a lead for each electrode pair, and The volume of the lead in the battery electrode is greatly reduced, and a sufficient volume energy density is secured. Further, in the separator, if one side of the plane quadrilateral of the same type of layer is connected to each other, each layer becomes continuous, and the separator is less likely to be wrinkled or twisted, and short circuit is suppressed.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

The stacked battery electrode according to the present invention is a stacked battery comprising a plurality of electrode pairs in which a flat quadrilateral positive electrode and a flat quadrilateral negative electrode are stacked via a flat quadrilateral separator. An electrode, wherein at least one of the positive electrode, the negative electrode, and the separator of an adjacent pair of electrodes is connected to one side of a plane quadrilateral of the same layer.

In the above-mentioned laminated battery electrode of the present invention, among the positive electrode, the negative electrode and the separator, one of the adjacent electrode pairs in which one side of a plane quadrilateral of the same type of layers is connected to each other. In the case where the uppermost layer in the stacking direction is the first layer, it is an odd number layer, and 1 ≦
In the n-th layer that satisfies the relationship n <(m−2), one side connected to an adjacent layer of the same type and one side adjacent thereto are also connected to the (n + 3) -th layer of the same type. Is also good.

In the above-mentioned laminated battery electrode according to the present invention, the positive electrode, the negative electrode, and the separator, in which one side of a plane quadrilateral of the same layer in the adjacent electrode pair is connected to each other, In the layer that is the uppermost layer and the lowermost layer in the stacking direction, only one side is connected to the same type of adjacent layer, and in the layer sandwiched between the uppermost layer and the lowermost layer, two adjacent sides are adjacent to each other. May be connected to each other.

Further, in the above-mentioned laminated battery electrode of the present invention, it is preferable that one side of a plane quadrilateral of the negative electrode be connected to the adjacent electrode pair.

The stacked battery electrode according to the present invention is manufactured as follows. Here, an example of a stacked battery electrode in which one side of a planar quadrilateral of a negative electrode is connected to an adjacent pair of electrodes is shown. In order to manufacture the stacked battery electrode of this example, first, as shown in FIG. 1, a negative electrode 1 in which a negative electrode mixture layer is formed by coating on one main surface side of a flat rectangular negative electrode current collector is prepared. In addition, a lead 2 extending in a direction orthogonal to the longitudinal direction is formed at a corner of the negative electrode 1.

On the negative electrode mixture layer of the negative electrode 1, a separator (not shown) capable of covering the entire negative electrode mixture layer is provided.

Further, the positive electrodes 3a, 3b, 3c, 3d, 3d,
3e and 3f are defined as the longitudinal direction of the negative electrode 1 and each of the positive electrodes 3a, 3b, 3
In the direction perpendicular to the longitudinal directions of c, 3d, 3e, and 3f, the negative electrode 1 is disposed at a predetermined interval, for example, in an upper half in the drawing.
At this time, leads 4a, 4c, and 4e are formed on the positive electrodes 3a, 3c, and 3e, respectively, to the left in the figure.
Leads 4b, 4d, and 4f are provided on the right side in the figure for b, 3d, and 3f.
Are formed, and the leads 4a and 4b, the leads 4c and 4d, and the leads 4e and 4f are formed adjacent to each other.

Next, the negative electrode is folded and bonded so that the negative electrode mixture layers face each other along the broken line AA 'in FIG. Then, as shown in FIG. 2, the positive electrode is sandwiched between the negative electrodes 1 via a separator (not shown). That is, the negative electrode 1, the separator, the positive electrode, the separator, and the negative electrode 1 are laminated in this order. At this time, the lead 2 and the leads 4a, 4b, 4c, 4d, 4e, 4f are exposed from the open end of the folded negative electrode 1.

Subsequently, the negative electrode 1 is folded so that a portion between adjacent positive electrodes (not shown) becomes a bent portion. That is, FIG.
It is bent so as to form a valley with respect to the paper surface at the middle broken line BB ′ (hereinafter referred to as “valley fold”).
At C ', the sheet is bent so as to form a mountain (hereinafter referred to as a mountain fold), a valley fold is performed at a broken line DD' in the figure, and a mountain fold is performed at a dashed line EE 'in the figure. A valley fold is performed at a broken line FF ′ in the figure.

As a result, as shown in FIG. 3, a positive electrode (not shown) and a separator are interposed therebetween, and a negative electrode 1 folded in a pleated shape is obtained. That is, for example, an electrode pair in which the negative electrode 1 and one surface of the positive electrode 3a are stacked via a separator, an electrode pair in which the other surface of the positive electrode 3a and the negative electrode 1 are stacked via a separator, and one surface of the negative electrode 1 and the positive electrode 3b The electrode pairs to be laminated via will be sequentially laminated,
Further, the remaining electrode pairs are sequentially laminated, and a plurality of electrode pairs are laminated.

Particularly, in this example, the negative electrode 1 is
Since the negative electrodes are folded and folded, one side of the planar quadrilateral of the negative electrode 1 in the adjacent electrode pair is connected. Further, in this example, particularly, since the separator is arranged on the negative electrode 1 so as to cover the negative electrode mixture layer, the separator is also formed as one separator, and this is folded. Accordingly, one side of the plane quadrilateral of the separator in the adjacent electrode pair is connected to each other.

Furthermore, in this example, since the negative electrode 1 is a single negative electrode and is folded, when the total number of layers is m, the number of layers is odd, and 1 ≦ n <(m −
In the n-th layer that satisfies the relationship 2), one side connected to an adjacent layer of the same type and one side adjacent thereto are (n + 3).
This means that it is also connected to the same type of layer.

That is, as shown in FIG. 3, the uppermost layer is a first layer 1a, and a second layer 1b and a third layer 1b are sequentially formed.
c, 4th layer 1d, 5th layer 1e, 6th layer 1f, 7th layer 1
g, the eighth layer 1h, the ninth layer 1i, the tenth layer 1j, the eleventh layer 1k, and the twelfth layer 1l, the first layer 1a is connected to the second layer 1b adjacent to the short side of the plane rectangle. Along with
The long side adjacent to the short side is the (1 + 3) layer, the fourth layer 1d
Is also connected. This is the third layer 1c, the fifth layer 1e,
The same applies to the seventh layer 1g and the ninth layer 1i. However, in the eleventh layer 1k, the total number of layers m is 12, and
(M−2) becomes 10, and 1 ≦ n <(m−2)
Is not able to satisfy the relationship of (1) and (2 + 3), and is not connected.

In this embodiment, the same applies to the separator.

Then, as shown in FIG. 4, the leads 4a, 4b, 4c,
4d, 4e and 4f are welded together to complete the laminated battery electrode of this example.

In the laminated battery electrode of this embodiment, the negative electrode 1
Since it is made into one sheet and this is folded,
One side of the planar quadrilateral of the negative electrode 1 in the adjacent electrode pair is connected to each other. That is, in the negative electrode 1, since each layer is continuous, it is not necessary to form a lead for each electrode pair, the volume of the lead occupying in the stacked battery electrode is greatly reduced, and sufficient volume energy density is obtained. Is secured, and it is possible to sufficiently cope with higher capacity.

Further, in the laminated battery electrode of this embodiment,
Since one separator is used and folded, one side of the planar quadrilateral of the separator is connected between adjacent electrode pairs, and each layer becomes continuous, causing wrinkling and kinking of the separator. Becomes difficult,
Short circuits are suppressed and reliability is improved.

In the laminated battery electrode of this embodiment,
Since the negative electrode 1 and the separator are made into one sheet and they are folded, various processes such as cutting out the lead for each negative electrode layer, manufacturing single cells, laminating single cells, and welding connection of the lead of each negative electrode layer are unnecessary. In addition, since the bonding step can be performed at a time to produce a plurality of electrode pairs at a time, the manufacturing cost can be reduced and the productivity can be improved.

Further, in the laminated battery electrode of the present embodiment, unlike the conventional laminated battery electrode, there is no occurrence of displacement during the production of a single cell, and short-circuiting and the like are suppressed.
Reliability is improved.

By the way, when the laminated battery electrode is manufactured as described above, when the thickness of the negative electrode or the separator is large, distortion is easily generated in the folded portion, which may cause an internal short circuit.

Therefore, when the thickness of the negative electrode or the separator is large, as shown in FIG. 5, in the negative electrode 1 on which a separator (not shown) is also formed, first, as shown in FIG.
2, a dashed-dotted line CC ′ in FIG.
The broken line DD 'in the figure, the dashed line EE' in the figure, and the broken line F in the figure
Bb 'in the figure, cc' in the figure, and d in the figure corresponding to -F '.
A cut may be made in the solid line portion at the position indicated by -d ', ee' in the drawing, and ff 'in the drawing.

Each of these cut portions is a portion that is not a connection portion with an adjacent layer. That is, when the layer that is the uppermost layer in the stacking direction of the electrode pair described above is the first layer, and when the total number of layers is m, the layer is an odd layer,
A cut is made in a connection portion of the n-th layer that satisfies the relationship of 1 ≦ n <(m−2) with the (n + 3) -th layer of the same type.

Therefore, in the stacked battery electrode formed in this manner, in the layers that are the uppermost layer and the lowermost layer in the stacking direction of the electrode pair of the negative electrode 1 and the separator, only one side is connected to the same type of adjacent layer. In the layer sandwiched between the uppermost layer and the lowermost layer, two adjacent sides are respectively connected to both adjacent layers.

In this way, it is possible to manufacture a laminated battery electrode in which an internal short circuit is prevented from occurring in the folded portion without significantly changing the above-described production process of the laminated battery electrode.

Further, in the examples described so far, the example in which the negative electrode and the separator are used as one sheet and they are folded has been described. However, it is needless to say that the same effect can be obtained even if the positive electrode is taken as one sheet and folded. No.

[0043]

EXAMPLES Next, in order to confirm the effects of the present invention, a stacked battery electrode was actually manufactured, and a stacked battery was formed using the same, and the characteristics were evaluated.

<Preparation of Sample> Example 1 First, a positive electrode was prepared. Lithium cobaltate 90 (parts by weight), carbon 5 (parts by weight), polyvinylidene fluoride 5
(Parts by weight) was mixed with an appropriate amount of N-methylpyrrolidone to obtain a positive electrode mixture having an appropriate viscosity. Further, a vinylidene fluoride-hexafluoropropylene copolymer 10 (parts by weight), propylene carbonate 20 (parts by weight) and dimethyl carbonate 70 (parts by weight) and diethyl carbonate 10 (parts by weight) and LiPF ₆ 5 (parts by weight Swelling medium 105 comprising
(Parts by weight) were mixed to obtain a polymer gel electrolyte.

Then, a positive electrode mixture was applied to both sides of a 20 (μm) thick positive electrode current collector and dried to form a 10 (μm) thick positive electrode mixture layer. Further, a polymer gel electrolyte was applied onto the positive electrode mixture layers on both surfaces of the positive electrode current collector and dried to form a polymer gel electrolyte layer having a thickness of 30 (μm), thereby completing a positive electrode. However, this positive electrode is 40 (mm) × 38 (m
m), and 24 sheets were formed.
In addition, a lead extending in the longitudinal direction was formed at a corner of each positive electrode.

Next, a negative electrode was formed. Carbon 85 (parts by weight) and polyvinylidene fluoride 15 (parts by weight) were mixed with N-methylpyrrolidone to obtain a negative electrode mixture having an appropriate viscosity.

Then, a negative electrode mixture was applied to one surface of the negative electrode current collector having a thickness of 10 (μm) and dried to form a negative electrode mixture layer having a thickness of 10 (μm). Further, the above-mentioned polymer gel electrolyte is applied on one side of the negative electrode mixture layer of the negative electrode current collector and dried to form a 30 (μm) thick polymer gel electrolyte layer,
The negative electrode was completed. The polymer gel electrolyte also functions as a separator. However, this negative electrode is 84 (m
m) × 960 (mm).
Further, a lead extending in a direction perpendicular to the longitudinal direction was formed at a corner of the negative electrode.

Next, in the same manner as shown in FIG.
Twenty-four positive electrodes formed earlier were disposed at predetermined positions on the polymer gel electrolyte of the negative electrode. Thereafter, a laminated battery electrode was prepared according to the above-described steps, and this was 40 (mm).
It was accommodated in a battery can of × 50 (mm) × 5 (mm) to complete a stacked battery. This stacked battery is referred to as Example 1.

Example 2 A positive electrode and a negative electrode were prepared in the same manner as in Example 1 except that the thickness of the positive electrode mixture layer was 20 (μm) and the thickness of the negative electrode mixture layer was 20 (μm). Then, a cut was made in the same manner as shown in FIG. Further, as shown in FIG. 1, 20 positive electrodes formed earlier were arranged at predetermined positions on the polymer gel electrolyte of the negative electrode. Thereafter, a laminated battery electrode was manufactured according to the above-described steps, and
The battery was housed in a battery can of 0 (mm) × 50 (mm) × 5 (mm) to complete a stacked battery. This stacked battery is referred to as a second embodiment.

Comparative Example 1 First, a positive electrode was manufactured. The positive electrode mixture used in Example 1 was applied to both surfaces of a positive electrode current collector having a thickness of 20 (μm) and dried to form a positive electrode mixture layer having a thickness of 10 (μm). Further, the polymer gel electrolyte used in Example 1 was applied and dried on the positive electrode mixture layers on both surfaces of the positive electrode current collector to form a polymer gel electrolyte layer having a thickness of 30 (μm), as shown in FIG. The positive electrode 13 was completed. However, this positive electrode 13 is 38 (mm)
It is a plane rectangle of × 38 (mm), and 24 sheets are formed. Each of the positive electrodes 13 was also formed with a lead 14a extending in the longitudinal direction at a corner.

Next, a negative electrode was formed. The negative electrode mixture used in Example 1 was applied to one surface of the negative electrode current collector having a thickness of 10 (μm) and dried to form a negative electrode mixture layer having a thickness of 10 (μm).
Further, the polymer gel electrolyte used in Example 1 was applied on the negative electrode mixture layer on one side of the negative electrode current collector and dried to form a polymer gel electrolyte layer having a thickness of 30 (μm). The negative electrodes 11a and 11b as shown were completed. However, the negative electrodes 11a and 11b are 40 (mm) × 40 (m
m), and a total of 48 sheets were formed. The negative electrodes 11a and 11b are provided at the corners with leads 12a and 12b extending in the longitudinal direction.
b were formed so that the leads 12a and 12b overlapped each other when the negative electrode mixture layers faced each other so as to face each other.

Then, as shown in FIG. 6, the negative electrodes 11a and 11b face each other such that the negative electrode mixture layers face each other, a positive electrode 13 is disposed therebetween, and these are adhered to each other. A single cell 15 as shown in FIG. In this single cell 15, the negative electrode 11a, the positive electrode 13, and the negative electrode 11
b are sequentially laminated. The single cell 15
Are the leads 12a, 12b of the negative electrodes 11a, 11b.
Were bonded together to form a lead 12.

Subsequently, 24 sets of the single cells 15 as described above were formed, and these 24 sets of the single cells 15 were stacked to complete a stacked battery electrode 16 as shown in FIG. In the laminated battery electrode 16, the leads 14 a derived from the positive electrode 13 are collectively referred to as the leads 14, and the negative electrodes 11 a and 11
The lead 12 derived from b is also summarized.

Then, the laminated battery electrode 16 is set to 40 (m
m) x 50 (mm) x 5 (mm)
A stacked battery was completed. This stacked battery is referred to as Comparative Example 1.

Comparative Example 2 First, a positive electrode was manufactured. The positive electrode mixture used in Example 1 was applied to both surfaces of a positive electrode current collector having a thickness of 20 (μm) and dried to form a positive electrode mixture layer having a thickness of 10 (μm). Further, the polymer gel electrolyte used in Example 1 was applied onto the positive electrode mixture layers on both surfaces of the positive electrode current collector and dried to form a polymer gel electrolyte layer having a thickness of 30 (μm), thereby completing the positive electrode. However, this positive electrode has a plane rectangular shape of 42 (mm) × 900 (mm). Note that a lead extending in a direction perpendicular to the longitudinal direction was formed substantially at the center of the positive electrode in the longitudinal direction.

Next, a negative electrode was formed. The negative electrode mixture used in Example 1 was applied to one surface of the negative electrode current collector having a thickness of 10 (μm) and dried to form a negative electrode mixture layer having a thickness of 10 (μm).
Further, the polymer gel electrolyte used in Example 1 was applied on one side of the negative electrode mixture layer of the negative electrode current collector and dried to form a 30 (μm) thick polymer gel electrolyte layer, thereby completing the negative electrode. did. However, this negative electrode is 44 (mm) × 93.
It is a flat rectangle of 0 (mm), and two sheets are formed. The negative electrode was formed with a lead extending substantially in the center in the longitudinal direction and extending in a direction perpendicular to the longitudinal direction so as to overlap when the negative electrodes face each other so that the negative electrode mixture layers face each other.

Then, as shown in FIG.
1a and 21b are opposed to each other so that the negative electrode mixture layers face each other, a positive electrode 23 is disposed therebetween, and they are bonded to each other, and are wound as shown by an arrow M in FIG.
The wound battery electrode 25 shown in FIG. In the wound battery electrode 25, the negative electrode 21a, the positive electrode 23, and the negative electrode 2
1b are radially stacked in the order of 1b. In addition,
In the wound battery electrode 25, the leads 22a and 22b of the negative electrodes 21a and 21b were bonded together to form a lead 22.

Then, the wound battery electrode 25 is set to 40 (m
m) x 50 (mm) x 5 (mm)
A stacked battery was completed. This stacked battery is referred to as Comparative Example 2.

<Evaluation of Samples> Subsequently, the volume energy densities and short-circuit rates of Examples 1 and 2 and Comparative Examples 1 and 2 were examined.

Specifically, 40 (mA), 4.2 (V)
Constant current / constant voltage charging for 30 (hours) and 40 (m
The volume energy density was calculated from the discharge capacity at the time of discharging to 3 (V) in A).

The volume energy density of the sample was 100 (%) in Comparative Example 1, and the volume energy density of each sample was expressed as a percentage of 100%. Table 1 shows the results.

[0062]

[Table 1]

From the results shown in Table 1, in Examples 1 and 2, which are the batteries using the laminated battery electrode to which the present invention is applied,
It can be seen that the volume energy density is significantly improved and the short-circuit rate is significantly reduced as compared with Comparative Examples 1 and 2, which are batteries using conventional electrodes.

That is, in the laminated battery electrode to which the present invention is applied, for example, since the negative electrode has a continuous structure in each layer, it is not necessary to form a lead for each electrode pair. It has been confirmed that the volume of this is greatly reduced, a sufficient volume energy density is secured, and it is possible to cope with a further increase in capacity.

The laminated battery electrode to which the present invention is applied has a structure in which the edge portion of the electrode is reduced as compared with Comparative Example 1 which is a conventional laminated battery electrode. Since the electrode has a structure in which the strained portion of the electrode is reduced as compared with Comparative Example 2 which is an electrode, it was also confirmed that the short-circuit rate was significantly reduced and good reliability was secured.

[0066]

As described above, in the laminated battery electrode according to the present invention, an electrode pair in which a planar quadrilateral positive electrode and a planar quadrilateral negative electrode are laminated via a planar quadrilateral separator is provided. Plural layers are stacked, and at least one of the positive electrode, the negative electrode, and the separator of the adjacent electrode pair is used.
In the type, one side of a plane quadrilateral of the same type of layer is connected to each other. That is, in the negative electrode and / or the positive electrode, if one side of a plane quadrilateral of the same layer is connected to each other, each layer becomes continuous, so that it is not necessary to form a lead for each electrode pair, and The volume of the lead occupying the battery electrode is greatly reduced, a sufficient volume energy density is secured, and it is possible to cope with a further increase in capacity. Also, in the separator, if one side of the plane quadrilateral of the same kind of layer is connected to each other, each layer becomes continuous, the separator is less likely to wrinkle and twist, short circuit is suppressed, and good reliability is obtained. Is secured.

[Brief description of the drawings]

FIG. 1 is a plan view schematically showing a step of manufacturing a stacked battery electrode according to the present invention in the order of steps, and arranging a positive electrode on a negative electrode.

FIG. 2 is a plan view schematically illustrating a step of manufacturing a stacked battery electrode according to the present invention in the order of steps, and schematically illustrating a step of folding a negative electrode.

FIG. 3 is a perspective view schematically illustrating a step of manufacturing a stacked battery electrode according to the present invention in the order of steps, and schematically illustrating a step of folding a negative electrode.

FIG. 4 is a perspective view showing the steps of manufacturing the stacked battery electrode according to the present invention in the order of steps, and showing the formed stacked battery electrode.

FIG. 5 is a plan view schematically showing a step of making a cut in a negative electrode.

FIG. 6 is an exploded perspective view schematically showing a step of preparing a positive electrode and a negative electrode, showing a step of manufacturing a stacked battery electrode in the order of steps.

FIG. 7 is a perspective view schematically showing a formed single cell, showing a step of manufacturing a stacked battery electrode in the order of steps.

FIG. 8 is a perspective view schematically showing the steps of manufacturing the stacked battery electrode in the order of steps, and schematically showing the formed stacked battery electrode.

FIG. 9 is a perspective view schematically showing a step of preparing a wound battery electrode, in which the steps of preparing a positive electrode and a negative electrode are shown in the order of steps.

FIG. 10 is a perspective view schematically illustrating the steps of manufacturing a wound battery electrode, in which the formed wound battery electrode is formed.

[Explanation of symbols]

1 negative electrode, 2 leads, 3a, 3b, 3c, 3d, 3
e, 3f Positive electrode, 4a, 4b, 4c, 4d, 4e, 4f
Lead

Claims (4)

[Claims] 1. A stacked battery electrode comprising a plurality of electrode pairs in which a planar quadrilateral positive electrode and a planar quadrilateral negative electrode are laminated via a planar quadrilateral separator, wherein adjacent electrodes are provided. In at least one of the pair of the positive electrode, the negative electrode, and the separator, one side of a plane quadrilateral of the same layer is connected to each other. 2. In the positive electrode, the negative electrode, and the separator, one side of a plane quadrilateral of the same layer is connected to each other in an adjacent pair of electrodes. When the number of layers is m and the total number of layers is m, the number of layers is odd, and 1 ≦ n <
In the n-th layer that satisfies the relationship of (m-2), one side connected to an adjacent layer of the same type and one side adjacent thereto are (n)
+3) The stacked battery electrode according to claim 1, wherein the stacked battery electrode is also connected to the same type of layer. 3. The positive electrode, the negative electrode, and the separator, in which one side of a plane quadrilateral of the same layer is connected to each other in an adjacent pair of electrodes, the uppermost layer and the lowermost layer in the stacking direction of the pair of electrodes. In the layer, only one side is connected to the same type of adjacent layer, and in the layer sandwiched between the uppermost layer and the lowermost layer, two adjacent sides are connected to both adjacent layers, respectively. The stacked battery electrode according to claim 1. 4. The stacked battery electrode according to claim 1, wherein one side of a planar quadrilateral of the negative electrode is connected to the adjacent pair of electrodes.