JP2014072145A - Nonaqueous electrolyte secondary battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery causing no deterioration in characteristics as a battery even when vibration resistance and impact resistance are enhanced.SOLUTION: A positive electrode side reinforcement part 69 is formed so as to straddle an electrode group 9 and the outer periphery of a body part 35 of a positive electrode terminal member 11. A negative electrode side reinforcement part 71 is formed so as to straddle the electrode group 9 and the outer periphery of a body part 55 of a negative electrode terminal member 13. The positive electrode side reinforcement part 69 and the negative electrode side reinforcement part 71 are formed by coating an olefin-based adhesive so as to straddle the positive electrode terminal member and the electrode plate group and also so as to straddle the negative electrode terminal member and the electrode plate group, and then hardening the adhesive.

Description

  The present invention relates to a non-aqueous electrolyte secondary battery such as a lithium ion battery.

  Nonaqueous electrolyte secondary batteries such as lithium ion batteries have the advantages of high energy density, low self-discharge and good cycle performance. Therefore, in recent years, non-aqueous electrolyte secondary batteries are expected to be used as power sources for various industrial machinery by increasing the size or capacity. Among non-aqueous electrolyte secondary batteries used as a power source for industrial machinery, an electrode group in which a positive and negative electrode plate is wound around a shaft core with a separator in a bottomed cylindrical container There is a wound type non-aqueous electrolyte secondary battery in which the battery is accommodated together with the electrolyte. In this type of conventional non-aqueous electrolyte secondary battery, the tip portion of the tab (collecting lead piece) extending from the positive electrode plate and the negative electrode plate constituting the electrode group is made of, for example, aluminum (positive electrode) or copper (negative electrode) It is joined to the current collector.

  When strong vibration or impact is applied to the non-aqueous electrolyte secondary battery having such a structure, the electrode group housed in the container may be displaced with respect to the container. For example, in a non-aqueous electrolyte secondary battery used as a power source for equipment mounted on a vehicle, strong vibrations and shocks applied to the vehicle or generated by the vehicle itself are applied to the power storage device for a long time. For this reason, in the nonaqueous electrolyte secondary battery of the type in which the above-described tab is joined to the current collector, the joining of some of the tabs and the current collector is cut, and the resistance of the connection portion is increased. There arises a problem that the power storage performance of the water electrolyte secondary battery deteriorates.

  In addition, in a non-aqueous electrolyte secondary battery, a connection member such as a nut may be screwed onto an output terminal portion of a terminal member that protrudes outside from a lid that closes the battery container. In such a case, when the nut is screwed into the output terminal portion, a force is applied from the rotating nut to the output terminal member, and the output terminal member swings, so that a part of the welded to the current collector is obtained. Tabs may be cut off.

  In JP 2011-54380 A (Patent Document 1), a positive electrode current collector is brought into contact with a cylindrical portion of a gasket that holds a lid and a battery container, thereby being perpendicular to the axial direction of the nonaqueous electrolyte secondary battery. A non-aqueous electrolyte secondary battery is disclosed in which a positive electrode current collector is held in any direction and durability against shock and vibration acting in a direction perpendicular to the axial direction of the cylindrical battery is improved.

JP 2011-54380 A

  In the structure shown in Patent Document 1, since the positive electrode current collector, the lid, and the battery container are held by the gasket, the positive electrode current collector to which the electrode group is connected is displaced with respect to the lid and the battery container. Can be prevented. For this reason, the vibration resistance and impact resistance can be improved to some extent. However, in the structure shown in Patent Document 1, the electrode group tab is simply welded to the positive electrode current collector. Therefore, even when the nonaqueous electrolyte secondary battery has the structure shown in Patent Document 1, when strong vibration and impact are applied, the electrode group is displaced with respect to the positive electrode current collector, and some tabs There is a risk that the connection between the current collector and the current collector will be broken.

  Further, in the wound type lithium ion battery, in order to maximize the battery characteristics, the positive electrode active material provided on the positive electrode plate is completely replaced with the negative electrode active material provided on the negative electrode plate via a separator. It is necessary to face to. However, when the electrode group is displaced with respect to the positive electrode current collector, the tab is twisted and the positive electrode plate is displaced toward the positive electrode current collector, so that a part of the positive electrode active material does not face the negative electrode active material, Battery characteristics may be degraded.

  An object of the present invention is to provide a non-aqueous electrolyte secondary battery capable of improving vibration resistance or shock resistance as compared with the prior art.

  The objective of this invention is providing the nonaqueous electrolyte secondary battery which can prevent the displacement of the electrode group with respect to a collector.

  Another object of the present invention is to provide a non-aqueous electrolyte secondary battery in which battery characteristics are not deteriorated even when vibration resistance or impact resistance is enhanced.

  An object of the present invention is to improve a non-aqueous electrolyte secondary battery including a wound electrode group, a positive electrode terminal member, and a negative electrode terminal member. The wound-type electrode plate group is configured by winding a positive electrode plate having a positive electrode tab and a negative electrode plate having a negative electrode tab around a shaft core via a separator. The positive electrode terminal member is disposed on one end side in the axial direction of the shaft core, and the positive electrode tab is welded. The negative electrode terminal portion is disposed on the other end side in the axial direction of the shaft core, and the negative electrode tab is welded. In this invention, the positive electrode side reinforcement part is formed by apply | coating the adhesive agent which does not react with a non-aqueous electrolyte so that a positive electrode terminal member and a winding type | mold electrode group may be connected. If comprised in this way, since a positive electrode terminal member, a winding type | mold electrode group, and a positive electrode tab are mutually adhere | attached and integrated by the adhesive agent, a positive electrode terminal member, a winding type | mold electrode plate group, and a positive electrode tab are It will not be displaced from each other. In addition, since the electrode group is not displaced with respect to the positive electrode current collector, the tab is twisted to prevent the positive electrode plate from being displaced toward the positive electrode current collector and preventing a part of the positive electrode active material from facing the negative electrode active material. can do.

  When one positive electrode tab is welded to the positive electrode terminal member, or when a plurality of positive electrode tabs are welded to a part of the outer peripheral surface of the positive electrode terminal member in the non-aqueous electrolyte secondary battery, It is possible to apply an adhesive between the end surface of the positive electrode terminal member facing the electrode plate group and the end surface of the wound electrode plate group facing the positive electrode terminal member. Therefore, the positive electrode side reinforcing portion can be formed between the end surface of the positive electrode terminal member facing the wound electrode plate group and the end surface of the wound electrode plate group facing the positive electrode terminal member. If comprised in this way, the area to which the adhesive agent in a positive electrode terminal member and a winding type | mold electrode group is applied widely can each be ensured, and a positive electrode terminal member, a winding type | mold electrode group, and a positive electrode tab will mutually be displaced. This can be surely prevented.

  The positive electrode side reinforcing portion may be formed so as to straddle the outer peripheral surface of the positive electrode terminal member and the outer peripheral surface of the wound electrode plate group. If comprised in this way, a positive electrode side reinforcement part can be easily formed only by apply | coating an adhesive agent so that it may straddle the outer peripheral surface of a positive electrode terminal member, and the outer peripheral surface of a winding type | mold electrode group.

  In particular, when a plurality of positive electrode tabs are entirely welded to the outer peripheral surface of the positive electrode terminal member, the end surface of the positive electrode terminal member that faces the wound electrode plate group and the wound type that faces the positive electrode terminal member In some cases, the adhesive cannot be applied to the end face of the electrode group. In this case, an adhesive is applied so as to cover all or part of the plurality of positive electrode tabs to form the positive electrode side reinforcing portion. If the positive electrode reinforcing portion is configured in this way, even a part of the tab is wrapped in an adhesive and becomes a fixed state, and the tab itself is reinforced to prevent the tab from being cut. For this reason, since the joining between the plurality of positive electrode tabs and the positive electrode terminal member is not completely broken, it is possible to prevent the battery characteristics from being deteriorated.

  An adhesive that does not react with the non-aqueous electrolyte may be applied so as to connect the negative electrode terminal member and the wound electrode plate group to further form the negative electrode side reinforcing portion. If the negative electrode side reinforcing portion is further provided in addition to the positive electrode side reinforcing portion, the connection between the negative electrode tab and the negative electrode terminal member is not cut off, so that it is possible to more reliably prevent the battery characteristics from being deteriorated. The negative electrode side reinforcing portion can be formed in the same manner as the positive electrode side reinforcing portion.

  The adhesive used may be basically any adhesive as long as it does not react with the non-aqueous electrolyte, but is preferably an olefin adhesive. According to the inventor's research, the olefinic adhesive does not react with or elute into the non-aqueous electrolyte, and even when contacted with the non-aqueous electrolyte, the adhesiveness and durability are not lowered. I found out. In addition, the olefin-based adhesive can be easily given a certain degree of viscosity, and easily becomes a so-called hot melt state. Therefore, even if it is applied on the plurality of tabs, the positive electrode side reinforcing portion can be reliably formed without easily flowing down. As the olefin-based adhesive, an adhesive using polypropylene, polyethylene, polyphenylene sulfide, and a material having a high content thereof can be used.

  A flame retardant may be added to the adhesive used. If a flame retardant is added to the adhesive, there is no need to consider where to apply the flame retardant separately, and the placement of the flame retardant is completed at the same time as the reinforcement is formed, reducing work man-hours. be able to. When the non-aqueous electrolyte secondary battery is placed in a high temperature environment or when overheating or overdischarge occurs, the flame retardant acts and the battery ignites due to the combustion of the positive electrode active material.・ Smoke can be prevented.

  In the specific nonaqueous electrolyte secondary battery of the present invention, the shaft core has a cylindrical shape, and the positive electrode terminal member and the negative electrode terminal member include a shaft core fitting portion that is fitted to the shaft core, and an outer periphery. A tab welded portion where the positive electrode tab or the negative electrode tab is welded to the portion, and an output terminal portion extending on the opposite side of the direction in which the shaft core fitting portion extends. The output terminal portion is formed with a screw portion into which a nut is screwed. And the anti-rotation structure part which comprises an anti-rotation structure is each formed in the axial center and the axial core fitting part of a positive electrode terminal member or a negative electrode terminal member by fitting. If comprised in this way, even when a nut is screwed together in an output terminal part, a positive electrode terminal member and a negative electrode terminal member will not rotate with respect to an axial center by a rotation prevention structure part. Therefore, when the nut is screwed, it is possible to prevent the terminal member from rotating and the tab welded to the terminal member from being cut. Even if such a detent mechanism is provided, the terminal member oscillates about the shaft center due to a problem in processing accuracy. This swinging also causes a tab to be cut if the swinging range is large or occurs over a long period of time, so it is sufficiently meaningful to provide a reinforcing portion.

It is a fragmentary sectional view of the lithium ion battery of one embodiment of the present invention. It is a figure which shows the state which winds an electrode group. It is a perspective view of a positive electrode terminal member. It is the figure which looked at the positive electrode terminal member from the positive electrode battery cover side. It is a graph which shows the relationship between a torque and a rotation angle. It is a fragmentary sectional view of the lithium ion battery of other forms of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing a state in which an embodiment in which the present invention is applied to a lithium ion battery is cut along its longitudinal direction. In FIG. 1, some components of the lithium ion battery are not shown. The lithium ion battery 1 according to the present embodiment includes a battery container body 3, a positive battery cover 5, a negative battery cover 7, an electrode group 9 infiltrated with an electrolyte, a positive terminal member 11, and a negative electrode. And a terminal member 13. In FIG. 1, some dimensions of the lithium ion battery are exaggerated for easy understanding.

  The battery container body 3 has a cylindrical shape with both ends opened by a nickel-plated steel material. Openings at both ends of the battery container body 3 are respectively closed by the positive battery cover 5 and the negative battery cover 7.

  The positive electrode side battery cover 5 and the negative electrode side battery cover 7 are provided with gas discharge ports 5a and 7a at positions indicated by reference numerals 5a and 7a, respectively, and terminal through holes 5b and 7b are provided at the center portions thereof. Yes. The gas discharge ports 5a and 7a are closed by a cleaving safety valve (not shown), for example, similarly to the safety valve structure disclosed in Japanese Patent Application Laid-Open No. 11-273650, and the cleaving safety valve is held by a valve retainer ring. When the pressure in the battery container body exceeds a certain level due to the generation of gas in the battery container body, the safety valve is in a cleaved state and releases the generated gas. An output terminal portion 37 of the positive electrode terminal member 11 and an output terminal portion 57 of the negative electrode terminal member 13 described later pass through the terminal through holes 5 b and 7 b through the rubber packing 15.

A non-aqueous electrolyte (not shown) is injected into the container body 3. Therefore, the non-aqueous electrolyte is infiltrated into the electrode plate group 9. In the present embodiment, a solution obtained by dissolving lithium hexafluorophosphate (LiPF ₆ ) as an electrolyte in a mixed solvent of ethylene carbonate, dimethyl carbonate, and diethyl carbonate is used as the nonaqueous electrolytic solution.

  FIG. 2 is a diagram showing a state in which the electrode plate group 9 used in the present embodiment is wound. The electrode plate group 9 is configured by winding a belt-like positive electrode plate 17 and a belt-like negative electrode plate 19 around a hollow cylindrical shaft core 23 via a separator 21 in a spiral shape. The positive electrode plate 17 of the present embodiment has a configuration in which a positive electrode active material containing lithium manganate, which is a lithium transition metal double oxide, is applied almost uniformly on both surfaces of an aluminum foil as a positive electrode current collector plate. On one side in the longitudinal direction of the aluminum foil, an uncoated portion 25 that is not coated with the positive electrode mixture is formed. The uncoated portion 25 is cut out in a comb-like shape, and a positive electrode tab 27 is formed by the remaining portion cut out.

  The negative electrode plate 19 has a configuration in which a negative electrode mixture containing carbon powder capable of occluding and releasing lithium ions as a negative electrode active material is applied almost uniformly on both surfaces of a rolled copper foil as a negative electrode current collector plate. The negative electrode active material is applied to the negative electrode plate so that the entire positive electrode active material of the positive electrode plate 17 faces the negative electrode active material through the separator when the electrode plate group is wound. Therefore, the length of the negative electrode active material in the axial direction is longer than that of the positive electrode active material. On one side in the longitudinal direction of the copper foil, an uncoated portion 29 that is not coated with the negative electrode mixture is formed. The uncoated part is cut out in a comb-like shape, and the negative electrode tab 31 is formed by the remaining part cut out. The negative electrode tab 31 is formed on the side opposite to the side on which the positive electrode tab 27 is formed. In FIG. 1, a plurality of positive electrode tabs 27 are located on the positive electrode side battery lid 5 side, and a plurality of negative electrode tabs 31 are located on the negative electrode side battery lid 7 side.

  The separator 21 is formed of a polyethylene porous material through which lithium ions can pass. The separator 21 prevents the positive electrode plate 17 and the negative electrode plate 19 from contacting each other.

  The shaft core 23 is formed of a polypropylene resin in a hollow cylindrical shape. At both end portions in the axial direction of the inner peripheral surface of the shaft core 23, concave portions 33 that open in the axial direction and the central direction of the axial line are respectively provided.

  Note that the detailed configuration of the positive electrode plate 17, the negative electrode plate 19, and the separator 21 is not related to the gist of the present invention, and thus the description thereof is omitted.

  A positive electrode terminal member 11 to which a plurality of positive electrode tabs 27 are connected is disposed adjacent to the end portion of the electrode plate group 9 between the positive electrode side battery cover 5 and the end portion of the electrode plate group 9. Further, a negative terminal member 13 to which a plurality of negative electrode tabs 31 are connected is disposed adjacent to the end of the electrode plate group 9 between the negative electrode side battery lid 7 and the end of the electrode plate group 9. . In the present embodiment, the positive terminal member 11 and the negative terminal member 13 have substantially the same shape.

  3 is a perspective view of the positive electrode terminal member 11 used in the present embodiment, and FIG. 4 is a view of the positive electrode terminal member 11 as viewed from the positive electrode battery lid 5 side. The positive electrode terminal member 11 includes an output terminal portion 37 at the center of the annular main body portion 35. The output terminal portion 37 is configured to extend through the positive battery lid 5 to the outside. The main body portion 35 is formed with an annular recess 39 centered on the output terminal portion 37. The annular recess 39 opens in the direction in which the output terminal portion 37 extends. A plurality of ventilation through holes 41 are provided at the bottom of the annular recess 39. It is not necessary to provide a plurality of ventilation through holes 41, and only one ventilation through hole 41 may be provided. The positive electrode terminal member 11 includes a columnar portion 43 that is inserted into the shaft core 23 of the electrode plate group 9 on the side opposite to the side where the output terminal portion 37 of the main body portion 35 is provided. By inserting the columnar portion 43 into one end portion of the shaft core 23, the positional relationship between the positive electrode terminal member 11 and the electrode plate group 9 is determined. A protrusion 45 is formed at the tip of the columnar portion 43. The protrusion 45 is formed in a size that fits into the recess 33 of the shaft core 23. In the present embodiment, the concave portion 33 of the shaft core 23 and the projection 45 of the columnar portion 43 each constitute a detent structure portion.

  Ends of a plurality of positive electrode tabs 27 led out from the positive electrode plate 17 are ultrasonically welded to the outer peripheral portion of the main body portion 35 of the positive electrode terminal member 11.

  A screw portion 47 is formed on the outer peripheral portion of the output terminal portion 37. As shown in FIG. 1, a nut member 49 is screwed into the screw portion 47. A washer 51 is disposed between the nut member 49 and the positive battery cover 5. The positive battery cover 5 is screwed with a screw member 53 that closes a screw hole for containing an electrolytic solution.

  In the present embodiment, as shown in FIG. 1, the negative terminal member 13 has substantially the same shape as the positive terminal member 11, and includes a main body portion 55, an output terminal portion 57, and an annular recess. 59 and a columnar portion 63. Also in the negative electrode terminal member 13, the columnar portion 63 is inserted into the shaft core 23 of the electrode plate group 9, and the positional relationship between the negative electrode terminal member 13 and the electrode plate group 9 is determined. Ends of a plurality of negative electrode tabs 31 led out from the negative electrode plate 19 are ultrasonically welded to the outer peripheral portion of the main body 55 of the negative electrode terminal member 13. A protrusion 65 is also formed at the tip of the columnar portion 63 of the negative electrode terminal member 13. The protrusion 65 also constitutes a detent structure portion.

  A screw portion 67 is formed on the outer peripheral portion of the output terminal portion 57 of the negative electrode terminal member 13, and the nut member 49 is screwed into the screw portion 67 as well as the positive electrode terminal member 11. A washer 51 is disposed between the nut member 49 and the negative battery lid 7.

  In the lithium ion battery according to the present embodiment, as shown in FIG. 1, the positive electrode side reinforcing portion 69 is formed so as to straddle the outer periphery of the main body portion 35 of the positive electrode terminal member 11 and the electrode plate group 9. In the present embodiment, the negative electrode side reinforcing portion 71 is formed so as to straddle the outer periphery of the main body portion 55 of the negative electrode terminal member 13 and the electrode plate group 9. The positive electrode side reinforcing portion 69 and the negative electrode side reinforcing portion 71 are formed so as to cover all of the plurality of positive electrode tabs 27 and the plurality of negative electrode tabs 31, respectively. The positive-side reinforcing portion 69 and the negative-side reinforcing portion 71 are made of an olefin-based adhesive (specifically, polypropylene as a main component, for example, Scotch weld hot melt adhesive 3748Q), a positive electrode terminal member and an electrode plate. After coating so as to straddle the group and straddle the negative electrode terminal member and the electrode plate group, the adhesive is cured. Specifically, the main body portion 35 of the positive electrode terminal member 11 and the outer peripheral portion of the electrode plate group 9 to which the plurality of positive electrode tabs 27 are welded, and the main body portion 55 of the negative electrode terminal member 13 to which the plurality of negative electrode tabs 31 are welded, and An adhesive is applied to the outer periphery of the electrode plate group 9. However, before welding the tab, spread the tab outward, apply the adhesive radially from the center of the electrode plate group to the outer periphery of the electrode plate group, and then attach the terminal member to the main body, You may make it weld to a terminal member. Even in this manner, the adhesive can be applied so as to cover a part of the plurality of tabs across the terminal member and the wound electrode plate group. When the adhesive is applied radially in this way, gaps extending radially are formed between the adhesive application portions, so that electrolyte infiltrates the electrode plate group through these gaps and releases gas generated in the event of an abnormality. It can be performed. In the present embodiment, a positive electrode side reinforcing portion 69 and a negative electrode side reinforcing portion 71 are formed by applying an adhesive made of Scotch, Weld, and hot melt adhesive 3748Q to which vinyl chloride or phosphate is added. Yes. For flame retardancy, for example, a cyclic phosphazene compound having a melting point of 90 ° C. or higher can be used. A cyclic phosphazene compound having a melting point of 90 ° C. or higher hardly affects the battery characteristics because the solid state is maintained when the battery has an internal temperature of 90 ° C. or lower and is normal.

  The positive-side reinforcing portion 69 of the present embodiment is fixed in a state where the positive electrode terminal member, the electrode plate group, and the plurality of positive electrode tabs are wrapped. Further, since the positive electrode side reinforcing portion 69 covers all or most of the plurality of positive electrode tabs, the plurality of positive electrode tabs are also fixed in a state of being wrapped by the positive electrode side reinforcing portion 69. Therefore, since the electrode plate group is not displaced with respect to the positive electrode terminal member, the plurality of positive electrode tabs are not cut. Therefore, it can prevent that a battery characteristic falls. Further, it can be prevented that the positive electrode plate is displaced toward the positive electrode terminal member by twisting the tab and a part of the positive electrode active material does not face the negative electrode active material.

  Similarly, the negative electrode side reinforcing portion 71 is fixed in a state of wrapping the negative electrode terminal member, the electrode plate group, and the plurality of negative electrode tabs. Further, since the negative electrode side reinforcing portion 71 covers all or most of the plurality of negative electrode tabs, the plurality of negative electrode tabs are also fixed in a state of being wrapped by the negative electrode side reinforcing portion 71. Therefore, since the electrode plate group is not displaced with respect to the negative electrode terminal member, the plurality of negative electrode tabs are not cut.

  Further, since the concave portion 33 of the shaft core 23 and the protrusion portion 45 of the columnar portion 43 and the concave portion 33 of the shaft core 23 and the protrusion portion 65 of the columnar portion 63 respectively constitute a rotation preventing structure portion, a nut member is provided on the screw portion 47. Even when 49 is screwed, the positive electrode terminal member and the negative electrode terminal member do not rotate significantly with respect to the axis. Therefore, when the nut is screwed, it is possible to prevent the terminal member from swinging and the tab welded to the terminal member from being cut.

  In order to verify the vibration resistance effect and impact resistance effect of the present invention, the inventor completely discharges the conventional finished lithium ion battery and the finished lithium ion battery of the present invention to take out the electrode group, and each electrode group Rotating torque was applied to the pole column in a fixed state, and the rotation angle, torque, and strength when the tab broke from the pole column welded with the tab output from the positive and negative electrodes of the electrode group were measured.

  FIG. 5 is a graph showing the relationship between torque and rotation angle. In the conventional electrode group, the torque gradually increased with the rotation angle, the electrode tab and the pole column welded portion were broken from the outer peripheral portion, and the torque was zero when all the tabs were broken. In the product of the present invention, the torque increased with almost no increase in the rotation angle of about 5 °. At the same time as the adhesive fixing part (electrode group and pole column) was peeled off, the tab was broken and the torque became zero. The breaking torque was about 1.5 times that of the conventional product.

  In addition, the battery was subjected to a vibration test with a random waveform for 96 hours, completely discharged to take out the electrode group, and the appearance of the electrode group was confirmed. In the conventional product, it was confirmed that a part of the electrode tab hitting the outer periphery of the electrode group was twisted. In the product of the present invention, no abnormality was observed in the electrode group, and the electrode group and the pole column were fixed with an adhesive.

  FIG. 6 is a cross-sectional view showing a state in which another embodiment in which the present invention is applied to a lithium ion battery is cut along its longitudinal direction. In FIG. 6, the same parts as those constituting the embodiment shown in FIG. 1 are denoted by the same reference numerals as those in FIG. Omitted. In the present embodiment, the positive electrode plate has one positive electrode tab 127, and the negative electrode number has one negative electrode tab 131. Therefore, only one positive electrode tab 127 is welded to the positive electrode terminal member 111, and only one negative electrode tab 131 is welded to the negative electrode terminal member 113. Therefore, in the present embodiment, a positive electrode side reinforcing portion 169 is formed between the end surface of the positive electrode terminal member 111 facing the electrode plate group 109 and the end surface of the electrode plate group 109 facing the positive electrode terminal member 111. Further, a negative electrode side reinforcing portion 171 is formed between the end face of the positive electrode terminal member 111 facing the electrode plate group 109 and the end face of the electrode plate group 109 facing the positive electrode terminal member 113. In this embodiment, the positive electrode terminal member 111 and the wound-type electrode plate group 109 and the negative electrode terminal member 113 and the wound-type electrode plate group 109 can have a wide area for applying the adhesive. It can prevent reliably that a type | mold electrode group, a negative electrode terminal member, a positive electrode tab, and a negative electrode tab mutually displace. In the present embodiment, there is one positive electrode tab and one negative electrode tab, but the number of tabs when the structure of the present embodiment is adopted is not limited to one. For example, even when a plurality of tabs are biased and joined to the outer peripheral surface of the terminal member, as in the present embodiment, an adhesive is applied between the terminal member and the winding plate group, Of course, the reinforcing portion may be formed.

In the lithium ion battery of the above embodiment, as a non-aqueous electrolyte, a solution obtained by dissolving lithium hexafluorophosphate (LiPF ₆ ) as an electrolyte in a mixed solvent of ethylene carbonate, dimethyl carbonate, and diethyl carbonate is used. Of course, other non-aqueous electrolytes can be used as long as a general lithium salt is dissolved in an organic solvent as an electrolyte. The mixing ratio is not limited.

  In the above embodiment, the lithium ion battery has been described. However, the present invention can of course be applied to other non-aqueous electrolyte secondary batteries.

  ADVANTAGE OF THE INVENTION According to this invention, even if it improves vibration resistance and impact resistance, the nonaqueous electrolyte battery with which the characteristic as a battery does not fall can be provided.

DESCRIPTION OF SYMBOLS 1 Lithium ion battery 3 Container body 5 Positive electrode side battery cover 7 Negative electrode side battery cover 9 Electrode plate group 11 Positive electrode terminal member 13 Negative electrode terminal member 15 Rubber packing 17 Positive electrode plate 19 Negative electrode plate 21 Separator 23 Shaft core 25 Uncoated part 27 Positive electrode Tab 29 Uncoated part 31 Negative electrode tab 33 Concave part 35 Main part 37 Output terminal part 39 Annular concave part 41 Venting through hole 43 Column part 45 Protrusion part 47 Screw part 49 Nut member 51 Washer 53 Screw member 55 Main part 57 Output terminal Part 59 Annular concave part 63 Columnar part 69 Positive side reinforcing part 71 Negative side reinforcing part

Claims (11)

A wound-type electrode plate group in which a positive electrode plate having a positive electrode tab and a negative electrode plate having a negative electrode tab are wound around an axis through a separator;
A positive electrode terminal member disposed on one end side in the axial direction of the shaft core and welded to the positive electrode tab;
A non-aqueous electrolyte secondary battery comprising a negative electrode terminal member disposed on the other end side in the axial direction of the axial core and welded with the negative electrode tab,
An adhesive that does not react with the non-aqueous electrolyte is applied so as to connect the positive electrode terminal member and the wound electrode plate group to form a positive-side reinforcing portion. Secondary battery.   The positive electrode side reinforcing portion is formed between an end surface of the positive electrode terminal member facing the wound electrode plate group and an end surface of the wound electrode plate group facing the positive electrode terminal member. Item 2. The nonaqueous electrolyte secondary battery according to Item 1.   The nonaqueous electrolyte secondary battery according to claim 1, wherein the positive electrode side reinforcing portion is formed so as to straddle an outer peripheral surface of the positive electrode terminal member and an outer peripheral surface of the wound electrode plate group. The positive electrode plate includes a plurality of the positive electrode tabs,
The non-aqueous electrolyte secondary battery according to claim 3, wherein the positive electrode side reinforcing portion is formed by applying the adhesive so as to cover all or a part of the plurality of positive electrode tabs.   5. The negative electrode side reinforcing portion is formed by applying the adhesive so as to connect the negative electrode terminal member and the wound electrode plate group. A nonaqueous electrolyte secondary battery according to 1.   The negative electrode side reinforcing portion is formed between an end surface of the negative electrode terminal member facing the wound electrode plate group and an end surface of the wound electrode plate group facing the negative electrode member. Item 6. The nonaqueous electrolyte secondary battery according to Item 5.   The non-aqueous electrolyte secondary battery according to claim 5, wherein the negative electrode side reinforcing portion is formed so as to straddle an outer peripheral surface of the negative electrode terminal member and an outer peripheral surface of the wound electrode plate group. The negative electrode plate includes a plurality of the negative electrode tabs,
The non-aqueous electrolyte secondary battery according to claim 7, wherein the negative electrode side reinforcing portion is formed by applying the adhesive so as to cover all or a part of the plurality of negative electrode tabs.   The non-aqueous electrolyte secondary battery according to claim 1, wherein the adhesive is an olefin-based adhesive.   The non-aqueous electrolyte secondary battery according to any one of claims 1 to 9, wherein a flame retardant is added to the adhesive. The shaft core has a cylindrical shape,
The positive electrode terminal member and the negative electrode terminal member include an axial core fitting portion that is fitted to the axial core, a tab weld portion in which the positive electrode tab or the negative electrode tab is welded to an outer peripheral portion, and the axial core fitting portion. An output terminal portion extending on the opposite side of the extending direction,
The output terminal portion is formed with a screw portion into which a nut is screwed,
The anti-rotation structure part which comprises an anti-rotation structure by fitting is formed in the said axial center and the said axial core fitting part of the said positive electrode terminal member or a negative electrode terminal member, respectively. 2. The nonaqueous electrolyte secondary battery according to item 1.