JP4208311B2 - Non-aqueous electrolyte battery - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a non-aqueous electrolyte battery, and more particularly to improvement of a separator inserted between a positive electrode plate and a negative electrode plate.
[0002]
[Prior art]
In recent years, lithium tetrafluoroborate (LiBF) has been added to any organic solvent such as ethylene carbonate (hereinafter referred to as EC), γ-butyrolactone, and 1,2-dimethoxyethane._Four) Or lithium perchlorate (LiClO)_FourA lithium battery using a non-proton (non-aqueous) electrolyte solution in which, for example, is dissolved as a negative electrode active material has been developed. In general, a lithium battery uses a strip-shaped positive electrode plate and a negative electrode plate which are stacked with a separator interposed therebetween, wound and immersed in the non-aqueous electrolyte, as a power generation element, that is, an electrode body.
[0003]
Such a lithium battery has a high electromotive force and can supply a large amount of power, so that it is now widely used as a backup power source for mobile phones, cameras, mobile computers, and the like.
[0004]
[Problems to be solved by the invention]
By the way, since the lithium battery as described above requires excellent insulation for the separator that separates the positive electrode plate and the negative electrode plate, for example, as disclosed in Japanese Patent Publication No. 2732370, the separator is made of polyethylene or polypropylene (hereinafter referred to as “polyethylene”). Techniques made by PE and PP are generally used. Since PE and PP are relatively inexpensive and easily available, they are considered to be suitable materials for the separator, and are not limited to this, and are also versatile, such as being used for battery containers for large storage batteries.
[0005]
However, such a conventional lithium battery has several problems to be considered in the discharge sustaining performance. Among these, there is a problem that the positive electrode plate and the negative electrode plate swell with the electrolyte solution and locally bite into the separator, causing an internal short circuit. As a result, the discharge capacity may be significantly reduced in proportion to the storage period of the battery.
The present invention has been made in view of the above-mentioned problems, and the object thereof is non-aqueous electrolysis capable of maintaining a power capacity better over a long period of time compared to the prior art by suppressing the occurrence of a local short circuit. An object is to provide a liquid battery.
[0008]
[Means for Solving the Problems]
  The present invention is a power generation element nonaqueous electrolyte battery in which a positive electrode plate and a negative electrode plate are opposed to each other with a separator interposed therebetween and impregnated with a nonaqueous electrolyte solution.Separator in which a fibrous first member is embedded in a film-like second member, or a separator formed by weaving or fusion-bonding fibers in which a fibrous first member is coated on a film-like second member The first member has a tensile strength of 350. kg / cm ² The second member is made of any one of the above polyamide, fluororesin, and polysilicon, and the second member is made of polyethylene or polypropylene.
[0009]
According to the non-aqueous electrolyte battery of the present invention including such a separator, first, the strength of the separator is improved, and the positive electrode plate and the negative electrode plate are swollen by the non-aqueous electrolyte, and a pressure is applied to the separator. However, deformation is effectively prevented. 350kg / cm²The above tensile strength is calculated as a value sufficient to prevent a short circuit between the positive electrode plate and the negative electrode plate and to have a good separator function without being damaged even when the separator receives a pressing force as described above. It is the value.
[0010]
Second, since the occurrence of an internal short circuit of the battery is suppressed in this way, the discharge capacity of the battery can be maintained over a long period of time.
Furthermore, if the container (exterior can) of the nonaqueous electrolyte battery of the present invention is cylindrical, and the positive electrode plate, the separator, and the negative electrode plate are used as electrode bodies having a spiral structure, and this electrode body is accommodated in the external can, for example, Compared to the type battery, deformation when the power generation element is housed (pushed) is reduced, and the power generation element can be kept in a stable state in the outer can, so that stabilization of the discharge capacity can be expected in particular.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
(1) Configuration of non-aqueous electrolyte battery
  Less than,Reference form andEmbodiments of the present invention will be described with reference to the drawings.
  (referenceForm 1)
  FIG.Reference examples andIt is a cross-sectional perspective view which shows the structure of the lithium battery which is one application example of the nonaqueous electrolyte battery of this invention. A lithium battery 100 shown in the figure is stored in a bottomed cylindrical outer can 101 in a state in which a sheet-like positive electrode plate 103 and a negative electrode plate 104 are spirally wound via a separator 102. The opening of the can 101 is sealed by caulking with a sealing plate 106 via an insulating gasket 105.
[0012]
The positive electrode plate 103, the negative electrode plate 104, and the separator 102 are impregnated with a non-aqueous electrolyte. Insulating plates 107 and 108 are interposed between the power generation element including the separator 102, the positive electrode plate 103, the negative electrode plate 104, and the like and the outer can 101.
As the negative electrode active material, metallic lithium, lithium compounds, lithium alloys (aluminum, lead, tin), and various materials (carbon, oxide, sulfide) capable of occluding and releasing lithium can be used. On the other hand, lithium cobaltate, lithium nickelate, lithium manganate, niobium oxide, vanadium oxide, or the like can be used as the positive electrode active material.
[0013]
As the solvent of the non-aqueous electrolyte, a 50:50 mixed solvent of EC and diethyl carbonate (hereinafter referred to as DEC), or a single EC or DEC is used. In addition, various nonaqueous solvents such as propylene carbonate, butylene carbonate, dimethyl carbonate, ethyl methyl carbonate, γ-butyrolactone, sulfolane, 1,2-dimethoxyethane, 1,2-ethoxymethoxyethane, tetrahydrofuran, dioxolane and the like can be used. . Furthermore, a mixed solvent in which these non-aqueous solvents are mixed may be used. In particular, a mixed solvent of EC and another organic solvent exhibits high charge / discharge current efficiency.
It is known.
[0014]
On the other hand, as the electrolyte of the non-aqueous electrolyte, lithium hexafluorophosphate (LiPF₆), Lithium trifluoromethanesulfonate (LiSO)_ThreeCF_Three), Lithium tetrafluoroborate (LiBF)_Four), Lithium hexafluoroarsenate (LiAsF)₆), Lithium trifluoromethanesulfonic acid imide (LiN (SO₂CF_Three)₂), Lithium trifluoromethanesulfonic acid methide (LiC (SO₂CF_Three)_Three) Etc. can be used.
[0015]
The separator 102 is a microporous plate having micro-order perforations in the thickness direction, and various nonaqueous electrolyte components (electrolytic ions) can flow between the positive electrode plate 103 and the negative electrode plate 104 during power generation. ing.
In the lithium battery 100 having such an internal structure, the side surface of the outer can 101 is covered with an outer film (not shown), and the bottom surface of the outer can 101 serves as the negative electrode terminal 111. Meanwhile, the positive terminal 110 is disposed at the center of the sealing plate 106. The positive electrode terminal 110 (negative electrode terminal 111) is connected to the positive electrode plate 103 (negative electrode plate 104) by a positive electrode tab 109 (negative electrode tab; (not shown)), whereby electric power is taken out of the battery.
[0016]
Here, the main feature of the lithium battery 100 is the separator 102. In the first embodiment, the separator 102 is structurally similar to a conventionally used microporous film, except that it is made of a material that is superior in mechanical strength to a conventionally used material. .
Specifically, the material of the separator 102 is acrylonitrile-butadiene-styrene copolymer (for example, polymerization ratio 1: 1: 1, hereinafter referred to as ABS), epichlorohydrin-bisphenol A epoxy resin (hereinafter referred to as EP), bisphenol-based polycarbonate. (Hereinafter referred to as PC), polyester (polyethylene terephthalate, hereinafter referred to as PET), polymelamine formaldehyde (polymelamine resin, hereinafter referred to as PMF) and the like. These polymer materials have at least a tensile strength of 350 kg / cm as shown in the mechanical strength table of various polymer materials shown in Table 1 below.²(PET) or better.
[0017]
[Table 1]
[0018]
Although detailed explanation is omitted, each material listed in Table 1 is immersed in a non-aqueous electrolyte at 80 ° C. for one month, and it is confirmed whether or not each material is dissolved in the electrolyte. As a result, it has been confirmed that the chemical stability with respect to the non-aqueous electrolyte is almost equal to or higher than that of PP.
It is known that PE, which has been conventionally used as a separator material along with PP, is as stable as PP with respect to non-aqueous electrolytes.
[0019]
When a conventional PP or PE separator is used, for example, the positive electrode plate 103 and the negative electrode plate 104 are swollen with a non-aqueous electrolyte, and when the separator is pressurized locally (particularly in places where it is strongly pressurized). ) The electrode plate breaks through the separator and causes an internal short circuit.
In contrast, according to the lithium battery 100, conventionally used PE (230 kg / cm²) And PP (320 kg / cm²), The separator is made of a material having a higher strength than the above, and therefore, even when the separator 102 is in a pressurized state, its deformation is suppressed. Thereby, the occurrence of an internal short circuit or the like is effectively prevented. Separator 102 is also stable with respect to the non-aqueous electrolyte, and combined with the above effect, the discharge capacity of the battery is stabilized over a long period of time.
[0020]
  (Embodiment 2)
  next,Application examples of the present inventionThe lithium battery according to the second embodiment will be described. The overall specifications of the lithium battery are as follows except for the separator.Reference form 1Because it is the same as, we will refrain from duplicating explanations. The appearance of the lithium battery separator in the second embodiment is substantially the same as that of the separator 102 of FIG. 1, but PP or PE is used as the separator body, and fibers made of a material having high mechanical strength are used as a reinforcing agent (reinforcing material). (Fiber) is composed of a microporous membrane embedded in a random direction.
[0021]
    For reinforcing fiberTheAny of lyamide (6-nylon), fluororesin (polytetrafluoroethylene, hereinafter PTFE), polysilicon (polydimethylsiloxane), or the like is used. These materials also have a tensile strength of at least 350 kg / cm as shown in Table 1 together with the material of the separator 102 in Reference Embodiment 1.²It has the above performance. The reinforcing fibers are not exposed on the separator surface and are all embedded in the separator body.
[0022]
  According to the lithium battery of the second embodiment, since the separator having higher strength than the conventional one is used, the positive electrode plate and the negative electrode plate are improved.Can be insulated for a long timeThe discharge capacity can be stabilized.
  Further, in the second embodiment, since the reinforcing fiber is embedded in the separator body, it does not come into contact with the non-aqueous electrolyte solution. There is a feature that can use the material with. Therefore, the types of materials that can be selected for manufacturing the separator are widened, which is advantageous in terms of productivity.
[0023]
    Moreover, since the said separator has embed | buried the reinforcement fiber in the random direction, it has the characteristics which have the outstanding toughness which cannot be calculated | required by the separator which consists of a single material. Thereby, separator strength can be raised with respect to multiple directions. Further, the separator strength can be adjusted to some extent by adjusting the density of the reinforcing fibers.
  (2) Production of each separator
  Next, a method for manufacturing each separator according to Embodiment 1 and Embodiment 2 will be described. From here, for convenience, the separator 102 of Reference Embodiment 1 is referred to as an A-type separator, and the separator of Embodiment 2 is referred to as a B-type separator.
(2-1) Production of A-type separator
  The A-type separator uses ABS, EP, PC, PET, PEM, or the like as its material. These materials can be processed using various known methods such as, for example, heating and melting once from a pellet or powder, and injection molding or cutting out from a plate having a certain thickness. Specifically, a known dry process (a material is mechanically perforated and stretched) can be mentioned. By using any of these methods, a microporous film having a thickness of about 50 μm, a pore diameter of about 0.2 μm, and a porosity of 40% is manufactured as an A-type separator.
(2-2) Production of B-type separator
  B-type separator is a reinforcing fiberToA fiber (diameter: 1 μm) made of any material such as lyamide (6-nylon), fluororesin (polytetrafluoroethylene, hereinafter PTFE), polysilicon (polydimethylsiloxane), or the like is selected. Then, PP or PE dissolved in a hydrocarbon solvent is mixed with the fiber at a weight ratio of 1: 1 by a known phase separation method. This is cooled and solidified as a sheet having a predetermined thickness, and then the solvent is removed. By the dry process, a microporous film having a thickness of about 50 μm, a pore diameter of about 0.2 μm, and a porosity of 40% is produced as a B-type separator.
(3) Lithium battery manufacturing method
  Next, each manufacturing method of the lithium battery of Reference Embodiment 1 and Embodiment 2 will be described as a whole.
[0024]
First, the positive electrode plate 103, the A-type separator (or B-type separator), and the negative electrode plate 104 are overlapped and wound in this order, and housed in the outer can 101 containing the insulating plate 108. At this time, the negative electrode plate 104 and the bottom surface of the outer can 101 are connected by a negative electrode tab (not shown) made of a strip-shaped metal material.
Next, the insulating plate 109 is inserted into the outer can 101, the positive electrode terminal 110 is inserted into the center of the sealing plate 106, and the positive electrode terminal 110 and the positive electrode plate 103 are connected by the positive electrode tab 109. Then, the inside of the outer can 101 is filled with a non-aqueous electrolyte, and a ring-shaped insulating gasket is attached to the periphery of the sealing plate 103, which is fixed to the opening edge of the outer can 101 by caulking, and the battery is sealed. To do.
[0025]
  In actual production, it is preferable to attach the tab 105 to the positive electrode plate in advance and connect it to the positive electrode terminal 110 later. Similarly, if the tab is attached to the negative electrode plate 104 before it is put in the outer can 101, it is easy to manufacture.
(4) Examples
  For each of the lithium batteries of Reference Embodiment 1 and Embodiment 2, separators made of all the materials listed in Table 1 above were prepared for the purpose of conducting experiments for performance comparison with conventional lithium batteries. A battery was produced. Data according to the embodiment will be described below.
* Non-aqueous electrolyte: 1M-LiPF₆(Solvent), EC: DEC = 1: 1 (electrolyte, volume ratio)
* Positive electrode active material mixture; LiCoO₂: Carbon: PTFE = 90: 6: 4 (weight ratio)
* Negative electrode active material mixture; Graphite: PTFE (binder) = 96: 4 (weight ratio)
Note that the PTFE is used here as a binder.
* Positive electrode core; Aluminum foil (thickness 20 μm)
* Negative electrode core; Copper foil (thickness 20 μm)
Specification of positive electrode plate (negative electrode plate); Thickness of about 20μm
* A-type separator; ABS, EP, PC, PET, PMF
* B-type separator;PoReamide (6-nylon), fluororesin (PTFE), polysilicon (polydimethylsiloxane) → reinforcing fiber PP, PE → separator body
Separator specifications (common to both A and B types); Thickness of about 50 μm, hole diameter of about 0.2 μm, porosity of 40%
  The positive electrode plate (negative electrode plate) was prepared by applying a positive electrode (negative electrode) active material mixture to a positive electrode (negative electrode) core. The battery dimensions were basically a cylindrical battery having a diameter of 14 mm and a height of 50 mm, and the sizes of the positive electrode plate (negative electrode plate) and the separator were standardized so as to be housed in an outer can of the battery. Although batteries of other shapes and dimensions were also produced, this will be described in a timely manner.
[0026]
Also, some conventional lithium batteries were produced as comparative examples for the examples. In this case, all the materials other than the separator were the same as the lithium battery of the above example. As a material for the separator of the lithium battery of the comparative example, PP, PE, polyimide, polyamide, fluororesin, polysilicon, and a laminated film formed by pressure bonding PE film + polyimide film were used.
[0027]
About each lithium battery produced in this way, charging current 1mA / cm²The battery is charged until the charging voltage reaches 4.2 V, and then the discharge current is 1 mA / cm immediately.²Then, the discharge was started, and the discharge was continued until the end voltage reached 3V. The discharge capacity at the time when the final voltage reached 3 V was measured as the discharge capacity before “storage start” described later, and it was confirmed that the value was about 400 mAh.
(5) Consideration on discharge maintenance performance
Hereinafter, the discharge maintenance performance of each of the lithium batteries of Examples and Comparative Examples will be compared and discussed. Specifically, the lithium battery separator material, battery shape, battery size, and the like were changed, and the change in the capacity deterioration rate of the lithium battery due to this was measured and used as a reference.
[0028]
The “capacity deterioration rate” refers to the ratio of the change amount of the discharge capacity after storage under a certain condition to the discharge capacity before the start of storage, and is specifically calculated by the following equation (1).
[0029]
(Equation 1)
Capacity deterioration rate (%)
= [{(Discharge capacity before storage)-(discharge capacity after storage at 60 ° C. for one month)} / (discharge capacity before storage)] × 100
  Here, in this experiment, the lithium battery was “stored at 60 ° C. for one month” by a known accelerated test method, and substantially corresponds to a state where it was stored for about one year and six months under normal conditions (at room temperature).
(5-1) Effect of separator material on capacity retention rate
  Table 2 shows the results of measuring the capacity retention rate of lithium batteries using the separator materials. In the same table, reference batteries 1 to 5 are A-type separators, batteries of the present invention.7-9, 11-13Are respectively B-type separators. The present invention battery7-9, 11-13In the item of “Separator material”, the left indicates the material used as the separator body and the right as the reinforcing fiber. Comparative batteries 1 to 7 are conventional lithium batteries prepared as comparative examples.
[0030]
[Table 2]
[0031]
The reason why the above results were obtained will be considered.
Comparative batteries 1 and 2 using PE and PP as a single material for the separator have the highest capacity reduction rate, followed by comparative batteries 3 and 3 using polyimide, polyamide, fluororesin (PTFE), polysilicon, etc. 6 shows the capacity deterioration rate reaching 11 to 13%.
[0032]
As described in the prior art, this is because the separator has insufficient mechanical strength or the separator reacts with the non-aqueous electrolyte, causing a short circuit inside the battery, which contributes to a decrease in discharge capacity. The result is considered. Also, when the separator is made with a (polyimide) structure that is partially weak in mechanical strength (PE) and can also react with a non-aqueous electrolyte solution as in the comparative battery 7, the numerical value of the capacity reduction rate is large. Was also reconfirmed.
[0033]
  For such comparative batteries 1 to 7, for example, an A-type separator was provided.referenceIn the batteries 1 to 5, the capacity reduction rate is clearly improved. Especially equipped with an A-type separator made of EPreferenceBattery 2 isreferenceIt shows that the discharge maintaining performance is the best among the batteries 1-5. EP is 500 kg / cm as shown in Table 1.²It is considered that such excellent discharge maintaining performance was exhibited because of its excellent tensile strength and stability to the non-aqueous electrolyte. High battery performance due to such a balance between strength and reactivity is equipped with an A-type separator.referenceIt seems to be common to all of the batteries 1-5.
[0034]
  On the other hand, the battery of the present invention provided with a B-type separator7-9, 11-13Turning to, a clear improvement in performance is recognized for these comparative batteries 1 and 2, which can be directly compared. That is, it is considered that such a good discharge maintaining performance was obtained by the synergistic effect of the stability of PE or PP with respect to the non-aqueous electrolyte and the excellent mechanical strength of the reinforcing fiber.
(5-2) Influence of battery shape on capacity retention rate
  From the above experiments, it was found that the A-type separator made of EP and the B-type separator made of PP using polyamide as a reinforcing fiber have good performance. Next, for lithium batteries (reference battery 2 and the present invention battery 7) provided with these separators, the lithium battery (reference battery 2B and the present invention battery 7B) having the same composition inside the battery and having only the battery shape changed to a square shape, respectively. ) Was prepared separately. The results of comparing the capacity retention rates of the cylindrical battery and the prismatic battery are shown in Table 3 (a) and (b) below.
[0035]
The specifications of the prismatic battery are as follows.
Square battery: 14 mm long x 14 mm wide x 50 mm high
(Discharge capacity before starting storage; about 400 mAh)
The capacity deterioration rate shown here is the same as that in Table 2 above.
[0036]
[Table 3]
[0037]
  As shown above, in the case of the prismatic batteries 2B and 7B, a slight performance deterioration is observed as compared with the cylindrical batteries 2 and 7, respectively.
  This is considered as follows. In other words, the rectangular battery has a rectangular cross section, and power generation elements such as a positive electrode plate, a separator, and a negative electrode plate housed in a spiral shape have an elliptical cross-sectional shape inside the outer can. For this reason, it is considered that the tension is applied to the power generation element at the end of the long axis of the ellipse, and this difference is caused. However, it can be seen that a discharge capacity of 90% or more is maintained even in the case of a prismatic battery, and the effect of the present invention can be sufficiently recognized whether the battery has a cylindrical shape or a rectangular shape.
(5-3) Effect of battery size on capacity retention rate
  Then saidreferenceBattery 2 andInvention batteryFor No. 7, the effect on the capacity deterioration rate when the battery size of the cylindrical outer can was changed was examined, and the measurement results at that time are shown in Tables 4 (a) and 4 (b) below. As shown in the same table, the change in the battery dimensions is that the diameter was increased to 2 times or 4 times, and the height was increased accordingly. ThisreferenceBattery 2,Invention battery7 for comparison, L (Large) size, VL (Very Large) sizereferenceBatteries 2L, 2VL,Invention battery7L and 7VL were respectively produced.
[0038]
The capacity deterioration rate shown here is the same as in Table 3 above.
[0039]
[Table 4]
[0040]
As shown in the table, in this experiment, a result that the capacity deterioration rate was reduced in proportion to the battery size was obtained. This is because as the battery size increases, the distortion in the spiral structure of the power generation elements such as the positive electrode plate, separator, and negative electrode plate stored in the outer can is reduced (that is, it is easy to wind), and the power generation elements are uniformly stored. This is considered to be because of this.
[0041]
By the way, in the large batteries 2L and 7L (2VL, 7VL) having a discharge capacity of 4 (40) Ah, the fact that such excellent capacity maintenance can be realized suggests a large practical effect. In other words, it is possible to effectively reduce the loss of the discharge capacity by using the battery of this embodiment in a larger size as compared to obtaining a discharge capacity by connecting small batteries in parallel. There seems to be.
(6) Summary
As explained above, according to the nonaqueous electrolyte battery in the above embodiment, it has been found that excellent discharge maintaining performance can be obtained as compared with the conventional case. This is considered to be a result obtained mainly by selecting the material of the separator separating the positive electrode plate and the negative electrode plate as in the present invention or by improving the separator structure.
[0042]
    In this example, 6-nylon was used as an example of polyamide, but 6,6-nylon, 6,12-nylon, aromatic polyamide, and the like may be used. Moreover, although polytetrafluoroethylene (PTFE) was used as an example of the fluororesin, polyvinylidene fluoride (PVF) or the like may be used.
    OtherTheResilicon is not limited to the example of this embodiment, and various materials may be used.
[0043]
In each experiment for examining the discharge maintaining performance, the case where lithium hexafluorophosphate was used as the electrolyte of the non-aqueous electrolyte was examined. However, the above-described lithium trifluoromethanesulfonate (LiSO_ThreeCF_Three), Lithium tetrafluoroborate (LiBF)_Four), Lithium hexafluoroarsenate (LiAsF)₆), Lithium trifluoromethanesulfonic acid imide (LiN (SO₂CF_Three)₂), Lithium trifluoromethanesulfonic acid methide (LiC (SO₂CF_Three)_Three), The same tendency was obtained.
[0044]
In addition, although the example in which the B-type separator is configured by embedding reinforcing fibers is shown, the present invention is not limited to this, and for example, a coated fiber in which PP or PE is coated on the reinforcing fibers as shown in FIG. Further, a microporous woven fabric or non-woven fabric may be produced from the coated fiber to form a separator. FIG. 2A is a separator made of a nonwoven fabric of the coated fiber, and FIG. 2B is an enlarged cross-sectional view showing the internal structure of the coated fiber.
[0045]
In addition to the above, the material mentioned as the reinforcing fiber may be processed into a film shape and coated with PP or PE to form a separator.
Further, the reinforcing fibers of the B-type separator may be other than the polymer material. For example, an alumina fiber which is an example of a fine ceramic fiber may be prepared as a reinforcing fiber and a separator including this may be configured. Further, alumina powder instead of fiber may be included in the separator body.
[0046]
Furthermore, even if powdered alumina is added to the reinforcing fiber, a certain degree of effect can be expected.
[0047]
【The invention's effect】
  As described above, according to the present invention,In a non-aqueous electrolyte battery of a power generation element in which a positive electrode plate and a negative electrode plate are opposed to each other via a separator and impregnated with a non-aqueous electrolyte, the tensile strength is 350 kg / cm ² The first member made of the above material uses a separator that is covered with a second member of polyolefin that has a chemical stability almost equal to or higher than that of polypropylene.Therefore, the strength of the separator is improved as compared with the conventional case, and even when the power generation elements such as the positive electrode plate and the negative electrode plate swell, it is possible to separate the two well. Therefore, since the occurrence of an internal short circuit of the battery can be suppressed, there is an effect that it is possible to ensure good discharge maintenance performance that could not be achieved in the past. Such an effect is recognized to be particularly effective when the battery container (outer can) is cylindrical.
[0048]
In the present invention, a material that has high mechanical strength but is difficult to use conventionally due to problems such as reactivity with the non-aqueous electrolyte can be used as the reinforcing fiber of the separator. Since this reinforcing fiber does not come into contact with the electrolytic solution, a wide variety of materials can be used. In addition, the reinforcing fiber can be selected in terms of production, such as coating the fiber itself with PP or PE to form a coated fiber, and producing a woven or non-woven fabric with the coated fiber as a separator.
[Brief description of the drawings]
FIG. 1 of the present inventionReference Embodiment 1 and Embodiment 2It is a schematic sectional drawing for demonstrating the structure of the nonaqueous electrolyte battery in.
FIG. 2 is a view showing a structure of a separator of a nonaqueous electrolyte battery in a variation of Embodiment 2 of the present invention.
  (A) is an expansion external view of the nonwoven fabric which consists of a covering fiber which comprises a separator.
  (B) is an expanded sectional view of the coated fiber.
[Explanation of symbols]
  101 Exterior can
  102 Separator
  103 positive electrode plate
  104 Negative electrode plate
  105 Insulation gasket
  106 Sealing plate
  107 Insulation plate
  108 Insulation plate
  109 Positive Tab
  110 Positive terminal
  111 Negative terminal

Claims (3)

In a non-aqueous electrolyte battery of a power generation element in which a positive electrode plate and a negative electrode plate are opposed via a separator and impregnated with a non-aqueous electrolyte solution, a fibrous first member is embedded in a film-like second member. The first member is made of any one of polyamide, fluororesin and polysilicon having a tensile strength of 350 kg / cm ² or more, and the second member is made of either polyethylene or polypropylene. Non-aqueous electrolyte battery. In a non-aqueous electrolyte battery of a power generation element in which a positive electrode plate and a negative electrode plate are opposed via a separator and impregnated with a non-aqueous electrolyte solution, a fibrous first member is coated on a film-like second member. And the first member is made of any one of polyamide, fluororesin, and polysilicon having a tensile strength of 350 kg / cm ² or more, and the second member. non-aqueous electrolyte cell member you characterized in that it consists of one of polyethylene, polypropylene. 3. The nonaqueous electrolyte battery according to claim 1, wherein the positive electrode plate, the negative electrode plate, and the separator constitute a spiral electrode body, and the electrode body is housed in a cylindrical container.