JP2003086172A - Secondary battery and its method of manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a secondary battery from being damaged by excessive impacts and deforming pressures by enhancing the mechanical strength of electrode terminals (current-collecting terminals). SOLUTION: The secondary battery includes a rechargeable battery body 1 having opposed positive and negative electrode plates; a positive electrode terminal 2 extending out of the battery body 1 to communicate with the positive electrode plate; a negative electrode terminal 3 extending out of the battery body to communicate with the negative electrode plate and opposed to the positive electrode terminal 2 with a predetermined interval between; and a reinforcement member 6 establishing a communication between the positive electrode terminal 2 and the negative electrode terminal 3 opposed to each other with a predetermined interval between. The secondary battery can be held in a container. An example of the reinforcement member 6 is a thermofusion resin clamping the positive electrode terminal and the negative electrode terminal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary battery, and more particularly, to a secondary battery having high impact reliability and a manufacturing method thereof.

[0002]

2. Description of the Related Art In non-aqueous electrolyte secondary batteries such as lithium ion secondary batteries, a lightweight container in which a lamination film made of a metal foil such as aluminum and a heat-sealable film is formed in a bag shape is a battery container. Is used as. Although the lamination film itself is reinforced with a protective film or the like, since such a lightweight container has low mechanical strength, it does not have a sufficient function of protecting the battery body.

For example, due to a large impact or the like, a displacement occurs between the battery body and the container, and an electrode terminal (current collecting terminal) for extracting an electric current from the battery body to the outside of the container or a peripheral portion thereof is damaged, causing cracks or breakage. Could occur.

Further, in a lithium ion secondary battery, etc.,
To reduce the weight, the weight-reducing container may be omitted. In this case, the electrode terminals are exposed and the reliability against impact is even lower.

Various methods have been proposed for protecting the battery body from impact and deformation pressure and ensuring the reliability of the battery. For example, as in US Pat. No. 5,460,904, a method for gelling an electrolyte, Japanese reissue patent WO 9
As described in 9/48163 and WO99 / 48163, a method of adhering the respective constituent elements of the battery body may be used. Further, as disclosed in Japanese Patent Laid-Open No. 2001-118566, a method of attaching a reinforcing member to a tab portion (electrode terminal) taken out from a battery body to improve strength has also been proposed.

Japanese Patent Laid-Open No. 2001-93576 discloses a method of bonding a battery body and a container. If this method is applied to a lightweight container, 1) the lamination film has a film layer for heat sealing on the inner surface, and it is difficult to firmly bond with an ordinary adhesive or pressure-sensitive adhesive. 2) Weight saving In a thin battery assumed in a container, there is a problem that the increase in thickness due to adhesion lowers the volume energy density, and 3) the substance diffused from the adhesive affects the battery characteristics. Further, no bonding method has been found that can realize an adhesive force capable of resisting an excessive impact applied to the secondary battery, and a simple method for improving the mechanical strength of the electrode terminal is required.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an electrode terminal (collector terminal).
It is intended to improve the mechanical strength of the secondary battery and prevent the secondary battery from being damaged by an excessive impact or a deformation pressure.

[0008]

A secondary battery according to the present invention comprises a rechargeable battery body having a positive electrode plate and a negative electrode plate disposed opposite to each other, and a positive electrode extending from the battery body and communicating with the positive electrode plate. A terminal, a negative electrode terminal that extends from the battery body and communicates with the negative electrode plate, and is arranged so as to face the positive electrode terminal at a predetermined interval, and a reinforcement that connects the positive electrode terminal and the negative electrode terminal that face each other at a predetermined interval. And a member.

The reinforcing member is made of a heat-fusible resin that sandwiches the positive electrode terminal and the negative electrode terminal.

The reinforcing member is composed of an insulating resin tape which surrounds the positive electrode terminal and the negative electrode terminal.

Further, the present invention is provided with a casing surrounding the battery body, the positive electrode terminal, the negative electrode terminal and the reinforcing member, and the ends of the positive electrode terminal and the negative electrode terminal extending outward.

Further, in the method of manufacturing a secondary battery according to the present invention, the positive electrode terminal and the negative electrode terminal are arranged so as to be opposed to each other at a predetermined interval to a battery body having a positive electrode plate and a negative electrode plate which are opposed to each other with a gap therebetween. And a step of connecting the positive electrode terminal and the negative electrode terminal provided at a predetermined interval with a reinforcing member,
A step of accommodating the battery body connected by the reinforcing member in a sealed container leaving one end, and a step of injecting the non-aqueous electrolyte solution into the gap between the positive electrode plate and the negative electrode plate from the unsealed end of the container, A step of sealing one end is provided.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A secondary battery according to the present invention will be described below by taking a non-aqueous electrolyte battery as an example. FIG. 1 is an overall view showing the configuration of a non-aqueous electrolyte battery. In the figure, 1 is a battery body, 2 is a positive electrode terminal, 3 is a negative electrode terminal, 4 is a container seal,
Reference numeral 6 is a reinforcing member. 2 (a) to 2 (c) show a cross section of the battery body 1 cut in a ring. In the figure, 7 is a positive electrode plate, 8 is a negative electrode plate, and 9 is a separator.

First, the internal structure of the battery body 1 will be described.
As shown in FIG. 2, the battery body 1 has a positive electrode plate 7 and a negative electrode plate 8 that are arranged in close proximity to each other with a separator 9 interposed therebetween, and an electrolyte solution (not shown) is provided in the gap between the members. It is filled. The structure in which the positive electrode plate 7 and the negative electrode plate 8 are stacked includes a stacking structure shown in FIG. 2 (a), a folding structure shown in FIG. 2 (b), and a stacking structure shown in FIG. 2 (c). Winding type structure,
And so on.

The positive electrode plate 7 and the negative electrode plate 8 are obtained by coating an active material on a current collector (electrode base material). The active material in the positive electrode plate 7 may be an oxide of a transition metal such as cobalt, manganese, or nickel, a chalcogen compound, a composite compound thereof, or a material to which various additive elements are added without any limitation. The active material has a particle size of 0.3 to 20μ
m is used, particularly preferably 1 to 10 μm. A mixture of these active materials, a carbon-based conductive auxiliary agent such as acetylene black or Ketjen black, and a binder such as polyvinylidene fluoride was applied to a current collector to have a porosity of about 20% to 40%. The positive electrode plate 7 is formed.

A carbonaceous material is preferably used as the active material in the negative electrode plate 8, but a material containing an oxide of boron or tin is also used. The shape is usually granular, and the particle size is preferably 0.3 to 20 μm, and particularly preferably 1 to 5 μm. Similarly to the positive electrode plate 7, the negative electrode plate 8 is also applied to the current collector together with polyvinylidene fluoride or a butyl-based binder to have a porosity of about 20% to 40%. It is also possible to use metallic lithium as the active material. The metallic lithium may be granular or foil-shaped.

If the particle size of the active material is too small, especially in the positive electrode, the surface area of the active material surface becomes too large, and the contact rate with the conductive auxiliary agent such as acetylene black decreases, resulting in lithium ions during charging and discharging. Doping and dedoping are not performed efficiently, and the battery characteristics deteriorate. On the other hand, when the particle size of the active material is too large, the diffusion distance of ions in the active material increases, and the concentration polarization increases, which deteriorates the battery characteristics. Further, not only is it difficult to reduce the thickness of the electrode plates (the positive electrode plate 7 and the negative electrode plate 8) and the packing density is lowered, but also the irregularities on the surface of the formed electrode plate become large, and good bonding with the separator 9 cannot be obtained.

A metal that is electrochemically stable inside the battery body 1 is used as the current collector, aluminum is preferably used for the positive electrode plate 7 and copper is preferably used for the negative electrode plate 8. The current collector is foil,
Although any shape such as a net or expanded metal can be used, foil is often used.

The positive electrode terminal 2 is a plate-shaped member (current collector terminal) made of aluminum metal or the like as a current collector (positive electrode plate 7), and the negative electrode terminal 3 is a plate-shaped member made of nickel, copper or the like ( The current collector terminals are attached to the current collector (negative electrode plate 8) by welding or the like. Instead of attaching by welding or the like, the end portion of the current collector may be processed into a terminal shape and used. In a non-aqueous electrolyte battery, a thin plate member is often used for both electrode terminals in order to reduce the overall weight, although the strength is insufficient.

Further, in the case where the positive electrode terminal 2 and the negative electrode terminal 3 have a superposed structure, a plurality of current collecting terminals connected to the current collector are connected to one and taken out of the battery body 1. Often. In the case of a wound type structure or a folded structure, it may be taken out from the center part of the cross section of the battery body 1 or may be taken out from the end part of the cross section. As described above, there are various ways to take out the positive electrode terminal 2 and the negative electrode terminal 3,
If the current collecting terminals taken out from the positive electrode plate 7 and the negative electrode plate 8 do not come into contact with each other and the current is taken out from the battery body 1 in the same direction so that the current can be efficiently taken out from the battery body, it is particularly problematic. There is no.

The reinforcing member 6 is a member that connects the positive electrode terminal 2 and the negative electrode terminal 3, and increases mechanical strength by integrating both electrode terminals. As a result, the force applied to the positive and negative electrode terminals by the impact is dispersed, and the impact resistance is enhanced.
In order to improve the mechanical strength, the thicker the integrated portion is, the better, but it is formed thinner than the battery body 1. Further, it is arranged as close as possible to the root portion where the current collector and the electrode terminal are connected.

The reinforcing member 6 does not necessarily have to be made of a material having a high rigidity, and may connect the positive electrode terminal 2 and the negative electrode terminal 3 to each other. There are various possible ways of communicating as shown in FIG. When the positive electrode terminal 2 and the negative electrode terminal 3 are thin plates and the strength of both electrode terminals is low, the effect of the reinforcing member 6 according to the present invention is remarkably exhibited.

Reinforcing member 6a shown in FIG. 3 (a)
Is formed by sandwiching the positive electrode terminal 2 and the negative electrode terminal 3 with two heat-fusible resins having a width wider than the terminal interval, and then hot pressing the resin. Instead of two sheets of heat-fusible resin, two-fold heat-fusible resin may be hot pressed.

The thickness of the heat-fusible sheet should be such that the thickness of the electrode terminals after integration does not exceed the thickness of the battery body 1, but since the weight increases and the energy density decreases, it is the minimum necessary. Need to be thick. Further, since the separator 9 may be transformed by hot pressing and the battery characteristics may be deteriorated, the temperature and time during hot pressing are appropriately selected. If hot pressing is performed at a temperature lower than the heat resistant temperature of the material forming the separator, the influence on the battery characteristics can be substantially ignored. In this sense, a heat-fusible sheet made of the same material as the material forming the separator can be preferably used.

Reinforcing member 6b shown in FIG. 3 (b).
Is obtained by winding the positive electrode terminal 2 and the negative electrode terminal 3 with an electrically insulating tape such as polyimide or polytetrafluoroethylene. When integrally fixing with polyimide tape, etc.,
It is preferable to make one electrode terminal as a starting point and to circulate around and fix both electrode terminals twice. Although the strength increases as the number of turns increases, the energy density decreases, so it is necessary to minimize the strength. Although it is inferior in mass productivity to integrally fixing the heat-fusible resin sheet by hot pressing, there is an advantage that the temperature of the battery body 1 does not rise. The electrically insulating tape may be wound in a figure 8 like the reinforcing member 6c.

Reinforcing member 6d shown in FIG. 3 (d)
First, the positive electrode terminal 2 and the negative electrode terminal 3 are first coated with an insulating adhesive sheet 11, and the positive electrode terminal 2 and the negative electrode terminal 3 are further insulated with a polytetrafluoroethylene plate, a vinyl chloride plate, a glass plate, or a ceramic plate. They are connected by a plate member. Since there is the insulating adhesive sheet 11, a plate-shaped metal member can be used. The mechanical strength of the plate-shaped member is higher than that of the heat-fusible resin. In addition,
The insulating adhesive sheet 11 may be omitted.

The electrolyte solution is a solution of an electrolyte salt in an electrolyte solvent. The electrolyte solvent may be liquid or gel. Liquid electrolyte solvents include ether solvents such as dimethoxyethane and diethyl ether, and ester solvents such as ethylene carbonate and propylene carbonate, alone or as a mixture, and may include other additives. LiPF6, LiC as the electrolyte salt dissolved in the electrolyte solvent
lO4, LiBF4, LiN (CF3SO2) 2, LiN (C2F5SO2) 2, LiCF3SO2
Etc. can be used.

As the electrolyte solution, a gel containing a polymer component containing the electrolyte solution may be used. The gelling method and material are not particularly limited, but it is preferable that the content of the electrolytic solution is 20% by weight to 98% by weight. When the electrolyte content is 20% by weight or less, the ionic conductivity of the gel itself becomes very low,
When forming a non-aqueous electrolyte secondary battery, sufficient ionic conductivity cannot be imparted to the electrolyte layer. Also, the electrolyte content is 9
If it is 8% by weight or more, the strength of the gel becomes very weak, and the effect of forming a gel decreases.

Inorganic fine particles such as silica and alumina may be mixed with the gel. This makes the gel porous,
The safety of the battery can be improved by improving the ionic conductivity and preventing a short circuit.

The polymer component is not particularly limited, but may be a methacrylic acid- or acrylic acid-based monomer or a polymer containing a monomer such as alkylene oxide, acrylonitrile, ethylene, styrene, vinyl alcohol or vinylpyrrolidone in the main chain. Resins such as coalesce, vinylidene fluoride homopolymers and copolymers can be used.

The separator 9 is necessary when the electrolyte solution is liquid. The separator 9 is provided even when the electrolytic solution is in a gel form, but may function as a battery without the separator 9. As the separator 9, a material having sufficient strength and chemically stable is selected from an insulating porous film, a net, a non-woven cloth and the like. A porous film made of a thermoplastic (fusion-bonding) resin such as polypropylene or polyethylene is preferable from the viewpoint of ensuring adhesiveness and safety.

As shown in FIG. 4, the battery body 1 can be housed in a container 5 in order to prevent evaporation and contamination of the electrolyte solution. The container seal 4 is a resin piece made of modified polyethylene or the like, and is provided for the purpose of improving the adhesion between the positive and negative electrode terminals 2 and 3 and the container 5. Further, when the inner surface of the container 5 has conductivity, it also has an effect of preventing a short circuit between the positive electrode terminal 2 and the negative electrode terminal 3. The container 5 may be a laminated container obtained by processing a film into a bag shape, a can-shaped container made of metal foil such as stainless steel or aluminum, or the like.

The film of the laminated container is preferably one that can be sealed by heat fusion and can prevent leakage of electrolyte solution from the battery and invasion of moisture from the outside. When the heat-fusible resin film is used, it is preferable that the inner surface or the outer surface is coated with a metal by vapor deposition, plating, or laminated with a metal foil such as aluminum to improve the barrier property. Various methods can be applied for forming the laminated container. There are a method in which a film cut into a rectangular shape is folded in two and heat-sealed in three directions, and a method in which both openings of a cylindrical film are heat-sealed.

The can-shaped container may be formed only from a metal foil having a sufficient thickness, but generally, for the purpose of weight reduction, a resin is laminated on an aluminum foil having a thickness of several microns to several tens of microns. Things are used. It is desirable to laminate a polyethylene or polypropylene film for imparting heat fusion property on the inner surface and a polyethylene terephthalate or stretched nylon film for enhancing the strength on the outer surface.

The container 5 may be a member in the state of being cut, but it may also be used after processing the recess corresponding to the battery body with a press or the like. It is also possible to cut an extra portion or perform a bending process after heat-sealing.

When the container 5 is a can-shaped container, the positive and negative electrode terminals 2 and 3 are connected to a conductor insulated from the can-shaped container,
Conduction of current with the outside of the battery is secured. In the case of a laminated container, the positive and negative electrode terminals 2 and 3 attached to the battery body 1
Passes through the heat-sealed portion and is taken out to the outside. When a deforming pressure or impact is applied, the battery body 1 and the container 5 are fixed by a heat-fusible resin, and both positive and negative electrode terminals 2 and 3 are integrally fixed by the reinforcing member 6 to fix them. The force applied to the electrode terminals is dispersed and deformation is suppressed.

The electrolyte solution may be impregnated in the battery body 1 in advance, or may be stored in the container 5 and then impregnated in the battery body 1. In the method of impregnating the battery body 1 in advance and then storing it in the container 5, a liquid injection process in which many battery bodies 1 are impregnated at one time can be adopted.
When it is inserted into the battery pack, the electrolyte solution leaking from the battery body 2 may wet the sealing surface of the container 5 and impair the sealing performance of the battery. On the other hand, in the method in which the battery body 1 is arranged at a predetermined position in the container and then the electrolyte solution is added from the sealing port with a syringe or the like, it is not necessary to wet the sealing sealing surface of the container 5.

Next, the effects of the present invention will be described in detail based on examples. Example 1. Electrode plate Polyvinylidene fluoride 5% by weight, LiCoO2 87% by weight, graphite powder KS-6 8% by weight adjusted positive electrode active material paste on a 20 μm thick aluminum foil as a current collector by the doctor blade method To a thickness of about 100 μm to form a positive electrode plate 7. A negative electrode active material paste prepared by adjusting mesophase microbead carbon (manufactured by Osaka Gas Co., Ltd.) to 95% by weight and polyvinylidene fluoride to 5% by weight was formed on a copper foil having a thickness of 12 μm as a collector by a doctor blade method. The negative electrode plate 8 was formed by applying a film having a thickness of about 100 μm.

After the electrode plate 5 mm × 55 mm × 0.25 mm plate member made of aluminum and plate member made of nickel were prepared, a modified polyethylene film (container seal 4) having a width of 6 mm was formed on the plate member in an aluminum laminated container. Two pieces were heat-fused on the upper and lower sides of the heat-sealed portion. Each electrode plate was cut into a size of 50 mm × 200 mm, and each plate member was attached to the edge portion of the collector foil by ultrasonic welding to obtain positive electrode / negative electrode terminals 2 and 3.

A separator 9 cut into a size of 52 mm × 210 mm is sandwiched between the battery body positive electrode plate 7 and the negative electrode plate 8 and the width is about 40 mm, and the positive and negative electrode terminals 2 and 3 are wound so as to come to the core portion. It was turned, and finally it was wrapped and fixed with Kapton tape. At this time, the positive and negative electrode terminals are 20 mm from the wound positive electrode plate 7 and negative electrode plate 8
It has become stretched.

The positive electrode terminal 2 and the negative electrode terminal 3 were placed between two heat-fusible resin sheets wider than the reinforcing member terminal interval, and hot press molding was performed to integrally fix both electrode terminals. The heat-fusible resin sheet in Example 1 is a polypropylene sheet having a thickness of 300 μm in each of the upper and lower sides, and the hot press temperature is set to 170 ° C. higher than the melting point thereof, and the pressure is such that the positive and negative electrode terminals 2 and 3 are not exposed. It was molded in. 20 by hot press
The thickness was reduced to 0 μm.

An aluminum laminate film having polypropylene as a heat-sealing resin cut into 102 mm × 58 mm containers was folded in half to form 51 mm × 58 mm, and the short side was heat-sealed with a width of about 5 mm to form a tubular shape. After inserting the battery body 1 into the cylindrical container 5,
In order to remove the attached water, by vacuum heating,
It was sufficiently vacuum dried. The heat-sealed portion of the cylindrical container 5 was placed in the middle of the positive and negative electrode terminals of the battery body, and then the vicinity of one of the electrode terminals was heat-sealed.

Electrolyte Solution Using a mixed solution of ethylene carbonate and diethyl carbonate as an electrolyte solvent, an electrolyte solution containing lithium hexafluorophosphate as an electrolyte salt was prepared. This electrolyte solution was put into a syringe, and the syringe was inserted to the back from the portion not heat-sealed to inject the electrolyte solution into the battery body (between the positive electrode plate 7 and the negative electrode plate 8). Then, the aluminum laminate film was sealed to complete the test battery.

Impact resistance Ten completed test batteries were dropped from a height of 1.5 m onto a concrete floor to evaluate impact resistance. The fall with the electrode terminal part down and the fall with the upper part alternately repeated,
After dropping 20 times, the test battery was disassembled to verify the damaged state of the battery body 1.

As a result, the nine test batteries were judged to be non-defective, because no cracks were found in the electrode terminal portions. Regarding one test battery, a crack having a length half the terminal width was confirmed in the negative electrode terminal 3, but it was not cut. Battery unit 1
Although the deformation of the corners was slightly left, it could be suppressed. However,
In the battery body 1 using polyethylene for the separator 9,
A 5% decrease in capacity characteristics, which is considered to be due to an increase in temperature during hot pressing, was observed.

Example 2. In Example 2, the thickness is 300 μm
A test battery was prepared in the same manner as in Example 1 except that the polyethylene sheet of 1 was fusion-bonded to both electrode terminals from above and below by hot pressing at 130 degrees to form the reinforcing member 6. As a result of the evaluation, all 10 test batteries were judged to be non-defective. Although the corner deformation of the battery body 1 was slightly left, it could be suppressed. Since polyethylene has a low melting point, the hot pressing temperature can be lowered, and as a result, deterioration of battery characteristics can be suppressed.

Example 3. In Example 3, the thickness is 150 μm
A test battery was prepared in the same manner as in Example 1 except that the polyethylene sheet of 1 was fused by hot pressing from the top and bottom at 130 degrees. As a result of the evaluation, no crack was observed in both electrode terminal portions of the eight test batteries, and it was judged as a good product. Two
Regarding the individual batteries, cracks having a length half the terminal width were confirmed in the negative electrode terminal 3, but they were not cut. Although the corner deformation of the battery body 1 was slightly left, it could be suppressed.

Example 4. In Example 4, the thickness is 100 μ
A polyimide adhesive tape having a width of m and a width of 5 mm was wound twice around to form the reinforcing member 6. Battery body 1 in a cylindrical container member
To complete the test battery in the same manner as in Example 1, and
The impact resistance of each test battery was evaluated. As a result, all 10 test batteries were judged to be non-defective. Although the corner deformation of the battery body 1 was slightly left, it could be suppressed.

Example 5. In Example 5, the thickness is 100μ
A polyimide adhesive tape having a width of 5 mm and a width of 5 mm was wound twice to form the reinforcing member 6. A test battery was prepared in the same manner as in Example 4 except that the container was prepared by the following method.

On an aluminum laminate film having polypropylene cut into 128 mm × 60 mm as a heat-sealing resin, a recess having a size of 41 mm × 55 mm and a depth of 4 mm was formed by pressing at a position where a battery body was arranged. This was folded in two, the battery body was sandwiched, and two sides including both electrode terminal portions were heat-sealed with a width of about 6 mm. After drying it,
An electrolyte solution was injected from the remaining one side in the same manner as in Example 1 and sealed to complete a test battery.

As a result of the evaluation, cracks were not recognized in both electrode terminal portions of the nine test batteries, and they were judged to be non-defective. With respect to one battery, a crack having a length half the terminal width was confirmed in the negative electrode terminal 3, but it was not cut.

Comparative Example 1. Battery unit 1 without reinforcing member 6
A test battery was completed in the same manner as in Example 1 except that was used. As a result of evaluation, 7 out of 10 test batteries
There are cracks in both electrode terminals for each battery,
Regarding three of them, it was observed that either the positive electrode or the negative electrode was broken. Also, damage was found in the corners of all the battery bodies.

Comparative Example 2. A battery body having no reinforcing member 6 was prepared, and a container was prepared by the following method described in Example 5. That is, a recess having a size of 41 mm × 55 mm and a depth of 4 mm was formed by pressing in an aluminum laminate film having polypropylene cut into a size of 128 mm × 60 mm as a heat-sealing resin at a position where a battery body was arranged. This 2
Fold it in half and sandwich the battery body, including both electrode terminal parts 2
The sides were heat-sealed with a width of about 6 mm. After drying this, an electrolyte solution was injected from the remaining side in the same manner as in Example 1 and sealed to complete a test battery.

As a result of the impact resistance evaluation, 8 of 10 test batteries had cracks in both electrode terminal portions, and 7 of them had the positive electrode or the negative electrode terminal broken. However, it was also found that the terminals of both electrodes were broken for three pieces. Also, damage was found in the corners of all the battery bodies.

FIG. 5 shows the evaluation results for the impact resistance described above in a summary of Examples and Comparative Examples. In Examples 1 to 5 including the reinforcing member 6, the number of non-defective products is overwhelmingly larger than that in Comparative Examples 1 and 2, and the effectiveness of the present invention is clearly shown.

[0056]

The secondary battery according to the present invention has a rechargeable battery body having a positive electrode plate and a negative electrode plate which are arranged opposite to each other, a positive electrode terminal extending from the battery body and communicating with the positive electrode plate, and a battery. A negative electrode terminal extending from the body and communicating with the negative electrode plate and arranged to face the positive electrode terminal at a predetermined interval; and a reinforcing member for communicating the positive electrode terminal and the negative electrode terminal facing each other at a predetermined interval. By doing so, it is possible to reduce the occurrence of cracks in the positive electrode terminal and the negative electrode terminal.

Further, since the reinforcing member is made of the heat-fusible resin that sandwiches the positive electrode terminal and the negative electrode terminal, it is possible to reduce the occurrence of cracks in the positive electrode terminal and the negative electrode terminal.

Further, since the reinforcing member is composed of the insulating resin tape that surrounds the positive electrode terminal and the negative electrode terminal, it is possible to prevent the temperature of the battery body from rising during the production of the reinforcing member.

Further, since the battery body, the positive electrode terminal, the negative electrode terminal, and the reinforcing member are surrounded by the case, and the ends of the positive electrode terminal and the negative electrode terminal can be extended to the outside, the evaporation of the electrolyte solution is prevented. can do.

Further, in the method for manufacturing a secondary battery according to the present invention, the positive electrode terminal and the negative electrode terminal are arranged so as to be opposed to each other at a predetermined interval to the battery body having the positive electrode plate and the negative electrode plate which are opposed to each other with a gap therebetween. And a step of connecting the positive electrode terminal and the negative electrode terminal provided at a predetermined interval with a reinforcing member,
A step of accommodating the battery body connected by the reinforcing member in a sealed container leaving one end, and a step of injecting a non-aqueous electrolyte solution into the gap between the positive electrode plate and the negative electrode plate from one end of the unsealed container, By including the step of sealing one end, it is possible to prevent the sealing sealing surface of the container from getting wet.

[Brief description of drawings]

FIG. 1 is an overall view showing a configuration of a secondary battery according to the present invention.

FIG. 2 is a diagram showing a cross section of a secondary battery according to the present invention.

FIG. 3 is a diagram for explaining a configuration of a reinforcing member according to the present invention.

FIG. 4 is a cross-sectional view showing another configuration of the secondary battery according to the present invention.

FIG. 5 is a diagram for explaining the results of an impact resistance test.

[Explanation of symbols]

1 battery body, 2 positive electrode terminal, 3 negative electrode terminal, 4
Container seal, 5 container, 6 reinforcing member, 7 positive electrode plate, 8 negative electrode plate, 9 separator,

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Daigo Takemura             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. (72) Inventor Shigeru Aihara             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. F-term (reference) 5H022 AA09 AA18 BB03 CC05 CC08                       CC12 CC16 EE06 KK03                 5H029 AJ11 AK02 AK03 AK05 AL02                       AL06 AL12 AL18 AM00 AM03                       AM04 AM05 AM07 AM16 BJ04                       BJ14 BJ15 CJ01 CJ05 CJ06                       CJ13 DJ01 DJ05 EJ12

Claims (5)

[Claims] 1. A rechargeable battery body having a positive electrode plate and a negative electrode plate disposed opposite to each other, a positive electrode terminal extending from the battery body and in communication with the positive electrode plate, and extending from the battery body A negative electrode terminal connected to the negative electrode plate and arranged to face the positive electrode terminal at a predetermined interval; and a reinforcing member connecting the positive electrode terminal and the negative electrode terminal facing each other at a predetermined distance. Secondary battery. 2. The secondary battery according to claim 1, wherein the reinforcing member is made of a heat-fusible resin sandwiching the positive electrode terminal and the negative electrode terminal. 3. The secondary battery according to claim 1, wherein the reinforcing member is made of an insulating resin tape that surrounds the positive electrode terminal and the negative electrode terminal. 4. The secondary battery according to claim 1, further comprising a casing which surrounds the battery body, the positive electrode terminal, the negative electrode terminal, and the reinforcing member and whose ends of the positive electrode terminal and the negative electrode terminal can be extended to the outside. 5. A step of providing a positive electrode terminal and a negative electrode terminal so as to be opposed to a battery body having a positive electrode plate and a negative electrode plate, which are opposed to each other with a gap therebetween, at a predetermined interval, and provided at the predetermined interval. Connecting the positive electrode terminal and the negative electrode terminal with a reinforcing member, storing the battery body connected with the reinforcing member in a sealed container leaving one end, and the unsealed container A method of manufacturing a secondary battery, comprising the steps of injecting a non-aqueous electrolyte solution into the gap between the positive electrode plate and the negative electrode plate from one end and sealing the one end.