JP5374531B2 - battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery whose battery performance does not deteriorate even when welding spatters generated during welding work for sealing the inside of a container intrude into the container. <P>SOLUTION: A battery 1 according to the present invention comprises: an electrode body 119 in which a plurality of electrode plates 111 are arranged at predetermined intervals; an internal case 101 which houses the battery body 119 and of which the upper part is opened; an external case 102 which covers the internal case 101 from below; and an external lid member 103 which covers the internal case 101 from above and of which the lower end 103a is fixed to the external lid member 102 by welding at a position lower than an opening of the internal case 101. <P>COPYRIGHT: (C)2013,JPO&amp;INPIT

Description

  The present invention relates to a battery, and more particularly, to a battery that prevents foreign matters from entering a battery container in which an electrode body is housed.

  In recent years, secondary batteries that can be repeatedly charged and discharged have been widely used as power sources for electric devices. This secondary battery has a configuration in which a laminate in which a positive electrode plate and a negative electrode plate are laminated via a separator is sealed in a battery container. FIG. 14 is a schematic longitudinal sectional view showing a configuration of a battery container according to a conventional example (see Patent Document 1). The battery case 90 includes a battery case 91 that is a casing having an upper opening, and a lid member 92 that closes the opening. The edge of the battery case 91 and the edge of the lid member 92 are fixed by welding. As a result, the inside is sealed.

  Here, the battery container 90 shown in FIG. 14A is such that the outer shape of the lid member 92 is slightly larger than the opening of the battery case 91, and the battery case 91 and the lid member 92 are welded from the side. And are fixed. On the other hand, the battery container 90 shown in FIG. 14B has an outer shape of the lid member 92 formed to be approximately equal to the opening of the battery case 91, and the battery case 91 and the lid member are welded from above. 92 is fixed.

JP 2003-132857 A

  However, in the conventional battery container 90, as shown in FIG. 14, the welding spatter S generated during the welding operation of the battery case 91 and the lid member 92, that is, the slag and metal particles that are scattered during welding, In some cases, the battery case 91 may be mixed from a minute gap generated between the lid member 92 and the lid member 92. In this case, there has been a problem that the performance of the battery is adversely affected by the mixed weld spatter S being dissolved in the electrolytic solution or by the heat of the weld spatter S.

  The present invention has been made in consideration of such circumstances, and its purpose is to provide a battery in which battery performance does not deteriorate even if welding spatter generated during welding work for sealing the inside of the container is mixed into the container. Is to provide.

In order to achieve the above object, the present invention employs the following means. That is, the battery according to the present invention includes an electrode body having a positive electrode plate, a negative electrode plate, and a separator, an inner case that accommodates the electrode body and has an upper opening, an outer case that covers the inner case from below, and the inner case An outer lid member that covers the case from above and has a lower end fixed to the outer case by welding at a position lower than the opening position of the inner case.

  According to such a configuration, the welding operation between the outer lid member and the outer case is performed at a position lower than the opening position of the inner case. Therefore, welding spatter generated during welding work, that is, foreign matter such as slag or metal particles scattered during welding, is mixed into the inside from the joint between the outer lid member and the outer case, but is blocked by the inner case and is used during the welding work. It does not penetrate into the inner case where the body exists.

  In the battery according to the present invention, the entire opening edge of the inner case is in close contact with the inner side surface of the outer lid member.

  According to such a configuration, the opening of the inner case is closed by the outer lid member, and the inside is sealed. Therefore, the welding spatter that has entered the gap between the outer case and the inner case, and the gap between the outer case and the inner case, will not affect the inner case regardless of the position of the battery after the welding operation. Do not mix inside. Thereby, battery performance does not fall under the influence of welding spatter. In addition, since the opening edge of the inner case is in close contact with the inner surface of the outer lid member, the vertical movement of the inner case inside the outer lid member and the outer case is suppressed even when vertical vibrations are applied. Thus, the battery performance can be maintained well.

  Moreover, the battery according to the present invention is characterized in that a gap between the outer case and the inner case is filled with a liquid having thermal conductivity.

  According to such a configuration, the heat generated in the electrode body when the battery is used is transmitted from the inner case to the outer lid member or the outer case via the liquid filled on the outer side, and from the outer lid member or the outer case to the surroundings. Heat is dissipated. Thus, since the heat generated when the battery is used is efficiently radiated to the outside of the battery, the battery performance can be maintained well.

  Further, the battery according to the present invention is characterized in that a gap between the outer case and the inner case is filled with a solidifying material that encloses the mixed foreign matter inside the gap.

  According to such a configuration, welding spatter (foreign matter) mixed in the gap between the outer case and the inner case is confined in the gap by the solidifying material. Therefore, regardless of the position of the battery, the weld spatter is integrated with the solidified material and does not enter the inner case. Thereby, battery performance does not fall under the influence of welding spatter.

  Further, the battery according to the present invention is characterized in that a vibration absorbing portion capable of elastic deformation with respect to vibration in the vertical direction is provided at an opening edge portion of the inner case.

  According to such a configuration, even if the vibration in the vertical direction acts, this vibration is absorbed by the elastic deformation of the vibration absorbing portion. Thereby, the vertical movement of the inner case is further suppressed, and the battery performance can be maintained satisfactorily.

  Further, the battery according to the present invention is characterized in that a vibration absorbing portion that is in contact with the bottom portion of the outer case and elastically deforms in the vertical direction is provided at the bottom portion of the inner case. .

  According to such a configuration, even if vibration in the vertical direction acts, this vibration is not only absorbed by the vibration absorbing portion provided at the opening edge of the inner case, but is also provided at the bottom of the inner case. Also absorbed by the vibration absorbing part. Thereby, the vertical movement of the inner case is further suppressed, and the battery performance can be maintained satisfactorily.

  The battery according to the present invention is characterized in that a horizontal positioning piece is provided on the outer side surface of the inner case so as to protrude laterally and contact the inner side surface of the outer case or the outer lid member. .

  According to such a configuration, the inner case is positioned in the horizontal direction by the horizontal positioning piece abutting against the inner surface of the outer case or the outer lid member. Therefore, even if the vibration in the horizontal direction acts, the inner case hardly rolls inside the outer case and the outer lid member, and the battery performance is not easily affected by the vibration.

  The battery according to the present invention is characterized in that a horizontal positioning piece that protrudes laterally and contacts the outer surface of the inner case is provided on the inner surface of the outer case or the outer lid member. .

  According to such a configuration, the inner case is positioned in the horizontal direction by the horizontal positioning piece protruding from the inner surface of the outer case or the outer lid member coming into contact with the outer surface of the inner case. Therefore, even if the vibration in the horizontal direction acts, the inner case hardly rolls inside the outer case and the outer lid member, and the battery performance is not easily affected by the vibration.

Moreover, the battery according to the present invention is characterized in that a projection for immovably fixing the electrode body is provided on the inner surface of the inner case.

  According to such a configuration, since the relative displacement between the laminate and the inner case is suppressed, the battery performance is not easily affected by vibration.

  The battery according to the present invention is characterized in that a resin is coated on outer surfaces of the outer case and the outer lid member.

  According to such a configuration, the battery is electrically insulated by the resin coating layer.

  According to the battery of the present invention, the welding spatter generated during the welding operation between the outer lid member and the outer case does not enter the inside of the inner case in which the electrode body is housed, so that the battery performance is deteriorated due to the influence of the welding spatter. There is nothing.

1 is an exploded perspective view showing a secondary battery according to a first embodiment of the present invention. The schematic longitudinal cross-sectional view which shows the AA cross section in FIG. The schematic longitudinal cross-sectional view which shows the BB cross section in FIG. The partial expanded longitudinal cross-sectional view which shows the modification of the junction part of an external case and an external cover member. The operation process figure for demonstrating the preparation procedure of a secondary battery. The operation process figure for demonstrating the preparation procedure of a secondary battery. The schematic longitudinal cross-sectional view which shows the secondary battery which concerns on 2nd Embodiment of this invention. The schematic longitudinal cross-sectional view which shows the secondary battery which concerns on 3rd Embodiment of this invention. The schematic longitudinal cross-sectional view which shows the secondary battery which concerns on 4th Embodiment of this invention. The schematic longitudinal cross-sectional view which shows the secondary battery which concerns on 5th Embodiment of this invention. The schematic longitudinal cross-sectional view which shows the secondary battery which concerns on 6th Embodiment of this invention. The schematic longitudinal cross-sectional view which shows the secondary battery which concerns on 7th Embodiment of this invention. The schematic longitudinal cross-sectional view which shows the secondary battery which concerns on 8th Embodiment of this invention. The schematic longitudinal cross-sectional view which shows the battery container which concerns on a prior art example.

  Embodiments of the present invention will be described below with reference to the drawings. First, the configuration of the battery according to the first embodiment of the present invention will be described. 1 to 3 are diagrams showing a secondary battery 1 according to the first embodiment, in which FIG. 1 is an exploded perspective view, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. It is sectional drawing. As shown in FIGS. 1 and 2, the secondary battery 1 includes a hollow battery container 10 whose inside is sealed, a laminated body 11 provided inside the battery container 10, and a battery container 10 filled with the inside. The electrolyte solution 12 and the resin coating layer 13 that covers the outer surface of the battery container 10 are provided. Here, in this embodiment, the secondary battery 1 is described as a stacked battery, but a cylindrical battery or the like may be used.

  As shown in FIGS. 1 and 2, the battery case 10 includes an inner case 101 that is a casing having an upper opening, an outer case 102 that covers the inner case 101 from below, and an inner case 101 that covers the inner case 101 from above. And an outer lid member 103 whose lower end is fixed to the outer case 102.

  The inner case 101 is for housing a later-described electrode body 119 constituting the multilayer body 11. As shown in FIG. 1, the inner case 101 has a substantially rectangular parallelepiped outer shape, and is provided with a vibration absorbing portion 101a having a substantially U-shaped longitudinal section so as to protrude from the upper end edge to the side. ing. The vibration absorbing portion 101a is elastically deformable so as to narrow the U-shaped opening with respect to the action of vibration in the vertical direction. Further, as shown in FIG. 2, a protrusion 101b is provided on the inner side surface of the inner case 101 so as to protrude in a substantially horizontal direction. The shape and size of the inner case 101 can be appropriately changed within a range in which the stacked body 11 can be stored. Further, the shape, number, position, and the like of the protrusion 101b are not limited to the present embodiment, and can be appropriately changed in design. In addition to constituting the vibration absorbing portion 101a as a part of the inner case 101 as in this embodiment, an elastic member such as a leaf spring is interposed between the opening edge of the inner case 101 and the outer lid member 103. You may let them.

  The outer case 102 is for housing the lower part of the inner case 101. As shown in FIG. 1, the outer case 102 is a hollow box-shaped member having a substantially rectangular parallelepiped outer shape, and an upper portion thereof is opened. The cross-sectional shape of the internal cavity of the outer case 102 is formed larger than the cross-sectional shape of the inner case 101. The height dimension of the outer case 102 is about half of the height dimension of the inner case 101. As shown in FIG. 1, the lower part of the inner case 101 is housed in the outer case 102 configured as described above, and the outer bottom surface of the inner case 101 contacts the inner bottom surface as shown in FIG. It has become a state. The height dimension of the outer case 102 is not limited to this embodiment, and can be set to any size within a range smaller than the height dimension of the inner case 101. The outer case 102 is formed in a plate shape. Also good. The shape of the outer case 102 can be changed as appropriate according to the shape of the inner case 101.

  The outer lid member 103 is for housing the upper part of the inner case 101. As shown in FIG. 1, the outer lid member 103 is a hollow box-shaped member having a substantially rectangular parallelepiped outer shape, and a lower portion thereof is opened. The cross-sectional shape inside the outer lid member 103 is larger than the cross-sectional shape of the inner case 101. The outer lid member 103 is formed such that its inner cross-sectional shape is larger than the cross-sectional shape of the inner case 101, and its lower end portion 103 a is substantially matched with the upper end portion 102 a of the outer case 102. Yes. Here, in this embodiment, since the upper end portion 102a of the outer case 102 is formed as a flat surface as shown in FIGS. 1 and 2, the lower end portion 103a of the outer lid member 103 is also formed as a flat surface so as to match this. . However, instead of this, for example, as shown in FIG. 4, the upper end portion 102a of the outer case 102 is partially cut out to form a stepped shape, while the lower end portion 103a of the outer lid member 103 is also fitted thereto. You may form in step shape. With such a shape, when the outer case 102 and the outer lid member 103 are joined, the gap generated between them is also stepped, so that welding spatter (foreign matter) generated during welding work passes through the gap. Thus, it is difficult for the battery container 10 to be mixed. The external lid member 103 is attached with an electrode terminal 114 (to be described later) constituting the laminate 11.

  As shown in FIG. 1, the outer lid member 103 configured in this way houses the upper portion of the inner case 101 therein, and as shown in FIG. 2, the vibration absorbing portion 101 a of the inner case 101 serves as the outer lid member. 103 is in close contact with the upper corner 103b. Thereby, the opening of the inner case 101 is closed by the outer lid member 103, and the inside of the inner case 101 is sealed. Further, the lower end portion 103a of the outer lid member 103 is joined to the upper end portion 102a of the outer case 102, and both are fixed by welding. The shape and size of the outer lid member 103 can be changed as appropriate according to the shape and size of the inner case 101 and the outer case 102. In the present embodiment, the height dimension of the outer case 102 is set to about half of the height dimension of the inner case 101. Therefore, the height dimension of the outer lid member 103 is also about half of the height dimension of the inner case 101. However, the design of the height of the outer lid member 103 can be changed as appropriate according to the height of the outer case 102.

  As shown in FIG. 3, the multilayer body 11 includes an electrode body 119 in which a plurality of electrode plates 111 and separators 112 are arranged in parallel with each other at a predetermined interval. The stacked body 11 is connected to the electrode terminal 114 by the electrode lead 113.

  The electrode plate 111 constituting the electrode body 119 has a sheet-shaped current collector such as a conductor foil or a conductor thin plate as a base material, and the surface of the base material is coated with an electrode active material corresponding to the type of the electrolyte solution 12. It is. As shown in FIG. 1, the electrode plate 111 is a substantially rectangular flat plate member, and is provided with an electrode tab 115 protruding from the upper end portion thereof. Here, the plurality of electrode plates 111 are composed of substantially the same number of positive electrode plates 111A and negative electrode plates 111B, and positive electrode tabs 115A as electrode tabs 115 protrude from one corner at the upper end of each positive electrode plate 111A. A negative electrode tab 115B as an electrode tab 115 protrudes from the other corner of the upper end portion of each negative electrode plate 111B.

  As shown in FIGS. 1 and 3, the plurality of electrode plates 111 configured as described above are configured such that positive electrode plates 111 </ b> A and negative electrode plates 111 </ b> B are alternately stacked via separators 112 inside the inner case 101. The positive electrode tabs 115A protruding from the plate 111A are bundled by being appropriately bent, and the negative electrode tabs 115B protruding from the respective negative electrode plates 111B are also bundled by being appropriately bent. As shown in FIG. 2, a protrusion 101 b provided on the inner surface of the inner case 101 is in contact with the upper edge of each electrode plate 111.

  The separator 112 constituting the electrode body 119 is for preventing the electrode plates 111 from contacting each other and short-circuiting. The separator 112 is made of a microporous resin film such as polyethylene or polypropylene, and is formed in a substantially rectangular shape having the same size as each electrode plate 111 as shown in FIG. As shown in FIG. 3, the plurality of separators 112 configured as described above are respectively disposed between the positive electrode plate 111A and the negative electrode plate 111B adjacent to each other. And the protrusion 101b provided in the inner surface of the inner case 101 is also contact | abutting also at the upper end edge of each separator 112, respectively.

  The electrode lead 113 is for electrically connecting each electrode plate 111 to each electrode terminal 114. As shown in FIG. 1, the electrode lead 113 is a band-shaped member made of a conductive member, and the width dimension thereof is formed to be substantially equal to the width dimension of each electrode tab 115. Here, the electrode lead 113 includes a positive electrode lead 113A and a negative electrode lead 113B. The positive electrode lead 113A is housed inside the inner case 101 in a state of being bent in a substantially S shape, and one end thereof is connected to a bundle of positive electrode tabs 115A, and the other end is a positive electrode terminal 114A described later. It is connected to the. On the other hand, the negative electrode lead 113B is also housed inside the inner case 101 in a state of being bent into a substantially S shape, and one end thereof is connected to a bundle of negative electrode tabs 115B and the other end is a negative electrode terminal 114B described later. It is connected to the.

  The electrode terminal 114 is for electrically connecting the secondary battery 1 to various electric devices. The electrode terminal 114 is a substantially cylindrical member made of a conductive member, and includes a positive electrode terminal 114A and a negative electrode terminal 114B. As shown in FIG. 2, the positive electrode terminal 114A is inserted into and fixed to the external lid member 103, one end thereof protrudes to the outside of the battery container 10, and the other end is connected to the positive electrode lead 113A. On the other hand, the negative electrode terminal 114B is inserted through the external lid member 103, and one end portion protrudes to the outside of the battery container 10, and the other end portion is connected to the negative electrode lead 113B.

  The electrolyte solution 12 is, for example, a solution in which a lithium salt such as lithium hexafluorophosphate or lithium tetrafluoroborate is dissolved in an organic solvent such as ethylene carbonate or diethyl carbonate as the electrolyte solution 12 of a lithium ion secondary battery. Can be used. The electrolytic solution 12 is filled in the inner case 101. Further, as shown in FIGS. 2 and 3, a gap outside the inner case 101, that is, a gap 116 between the outer case 102 and the inner case 101 and a gap 117 between the outer lid member 103 and the inner case 101 are formed. Are filled with the electrolyte solution 12 respectively. In the present embodiment, the gap 116 and the gap 117 are filled with the same electrolytic solution 12 as the inside of the inner case 101. However, the present invention is not limited to this, and the gap 116 and the gap 117 are heated in place of the electrolytic solution 12. Any fluid or solid with good conductivity can be filled.

  The resin coating layer 13 is for electrically insulating the battery container 10 from the outside. As shown in FIGS. 2 and 3, the resin coating layer 13 is provided so as to cover the outer surface of the outer case 102 and the outer surface of the outer lid member 103 that constitute the battery container 10.

  Next, a manufacturing procedure and operational effects of the battery container 10 according to the first embodiment will be described. When the battery container 10 is manufactured, first, an electrode body 119 is prepared by laminating a plurality of electrode plates 111 and separators 112 at a predetermined interval. As shown in FIGS. It is stored inside the case 101. Then, as shown in FIG. 2, the position of the electrode body 119 inside the inner case 101 is fixed by forming a protrusion 101 b on the inner surface of the battery container 10. Here, as a method of forming the protrusion 101b, a method in which the inner case 101 is pressed from the outside and a part of the inner case 101 protrudes inward, or a method in which the inner side surface of the inner case 101 is partially cut out and bent inward is used. Is mentioned. Thus, by fixing the position of the electrode body 119 with the projection 101b, the electrode body 119 moves up and down and does not come into contact with the inner case 101 even when vertical vibrations are applied. Not easily affected.

  Next, the electrode lead 113 is connected to the electrode body 119. Specifically, as shown in FIG. 1, among the electrode plates 111 accommodated in the inner case 101, one end of the positive electrode lead 113A is fixed to a bundle of positive electrode tabs 115A protruding from the positive electrode plate 111A by welding. Let Similarly, one end of the negative electrode lead 113B is fixed to the bundle of negative electrode tabs 115B protruding from the negative electrode plate 111B by welding. Although not shown in FIG. 1, the positive electrode lead 113A and the negative electrode lead 113B are not bent at this stage and are in a flat state.

  Next, the electrode terminal 114 is connected to the electrode lead 113. Specifically, the lower part of the inner case 101 in which the electrode body 119 is accommodated is accommodated in the outer case 102, and the outer lid member 103 to which the electrode terminal 114 is fixed is disposed above the inner case 101. Then, the proximal end portion of the positive electrode terminal 114A is fixed to the distal end portion of the positive electrode lead 113A, and the proximal end portion of the negative electrode terminal 114B is fixed to the distal end portion of the negative electrode lead 113B by welding. Even at this stage, the positive electrode lead 113A and the negative electrode lead 113B are not bent and are in a flat state, and the outer case 102 and the outer lid member 103 are separated from each other.

  Next, the outer lid member 103 and the outer case 102 are joined. That is, the outer lid member 103 disposed above the inner case 101 is lowered downward while the positive electrode lead 113A and the negative electrode lead 113B in a flat state are bent into a substantially S shape as shown in FIG. Then, as shown in FIG. 5A, the lower end portion 103a of the outer lid member 103 formed in a shape that substantially matches the upper end portion 102a of the outer case 102 is joined. At this time, the vibration absorbing portion 101 a provided at the upper end portion of the inner case 101 is in close contact with the upper corner portion 103 b of the outer lid member 103. Thereby, the opening of the inner case 101 is closed by the outer lid member 103, and the inside of the inner case 101 is sealed. Furthermore, since the elastically deformable vibration absorbing portion 101a is in close contact with the external lid member 103, even if the vibration in the vertical direction acts, this vibration is absorbed by the elastic deformation of the vibration absorbing portion 101a. Thereby, the vertical movement of the inner case 101 is suppressed, and battery performance can be maintained satisfactorily. In addition, when the vibration absorbing portion 101 a is in close contact with the outer lid member 103, the inner case 101 is positioned to some extent in the horizontal direction inside the outer lid member 103. Thereby, even if the vibration in the horizontal direction acts, there is an advantage that the inner case 101 does not easily roll and the battery performance is not easily affected by the vibration.

  Next, the outer lid member 103 and the outer case 102 are fixed by welding. That is, as shown in FIG. 5 (b), the welding rod Y is approached from the side of the battery container 10, and the joint 118 between the outer lid member 103 and the outer case 102 is welded. At this time, the welding spatter S generated by the welding operation passes through a minute gap 116 (not shown) generated between the outer lid member 103 and the outer case 102, and the outer lid member 103 and the inner case 101. May enter into the gap 116 between the outer case 102 and the inner case 101. And when it penetrate | invades, as shown to Fig.6 (a), the welding sputter | spatter S accumulates on the bottom part of the outer case 102. FIG. Here, during this welding operation, the joint 118 between the outer lid member 103 and the outer case 102 becomes very hot. However, the gap 117 between the outer lid member 103 and the inner case 101 and the gap 116 between the outer case 102 and the inner case 101 are filled with air having a high heat insulating effect. Therefore, even if the outer lid member 103 and the outer case 102 become high temperature, the heat is not easily transmitted to the inner case 101, so that the battery performance can be prevented from being deteriorated due to the influence of heat.

  Next, a resin is coated on the outside of the battery container 10. That is, as shown in FIG. 6A, the resin coating layer 13 is formed so as to cover the outer surfaces of the outer lid member 103 and the outer case 102. Thereby, the battery case 10 is electrically insulated from the outside. In addition, a certain amount of heat is applied to the outer lid member 103 and the outer case 102 also during the resin coating operation. However, as in the welding operation, the heat of the outer case 102 and the outer lid member 103 is not easily transmitted to the inner case 101 due to the presence of an air layer having a high heat insulating effect, thereby preventing deterioration of battery performance due to the influence of heat. be able to.

  In this embodiment, the resin coating operation is performed after the welding operation. However, the resin may be coated on the outside of the battery container 10 in advance before performing the welding operation. In this case, the periphery of the joint 118 between the outer lid member 103 and the outer case 102, which becomes high during welding, is left in a state in which the surface of the outer lid member 103 and the outer case 102 is exposed without being coated with resin. . And after performing a welding operation, an insulating tape is stuck around the joint 118. Thereby, the whole battery container 10 can be insulated by both the resin coating layer 13 and the insulating tape.

  Finally, the electrolytic solution 12 is injected into the battery container 10. That is, the electrolytic solution 12 is injected into the inner case 101 from a liquid injection hole (not shown) provided in the outer lid member 103. Further, a gap 117 between the outer lid member 103 and the inner case 101 and a gap between the outer case 102 and the inner case 101 from a liquid injection hole (not shown) provided in the outer lid member 103 or the outer case 102. The electrolyte solution 12 is also filled in the gap 116. As a result, the welding spatter S accumulated on the bottom of the outer case 102 diffuses throughout the gaps 116 and 117. However, as described above, the inside of the inner case 101 is sealed by the vibration absorbing portion 101a of the inner case 101 being in close contact with the upper corner portion 103b of the outer lid member 103. Therefore, the electrolytic solution 12 injected into the inner case 101 and the electrolytic solution 12 filled in the gaps 116 and 117 outside the inner case 101 do not mix. Thereby, since the welding spatter S does not penetrate into the inner case 101, the battery performance is not deteriorated by the influence of the welding spatter S. Further, since the electrolyte solution 12 having good thermal conductivity is filled in the gaps 116 and 117 outside the inner case 101, the heat generated in the laminate 11 when the battery is used is transferred from the inner case 101 to the electrolyte solution outside the inner case 101. It is transmitted to the external lid member 103 and the external case 102 via 12. This heat is radiated from the outer lid member 103 and the outer case 102 to the surroundings. Thus, since the heat generated when the battery is used is efficiently radiated to the outside of the battery container 10, the battery performance can be maintained well.

  It should be noted that filling the electrolytic solution 12 in the gaps 116 and 117 outside the inner case 101 is not essential to the present invention, and the gaps 116 and 117 may be filled with air. However, filling the gaps 116 and 117 with the electrolyte solution 12 as in the present embodiment has an advantage that the heat generated when the battery is used is efficiently radiated to the outside of the battery container 10 as described above.

  Next, the configuration of the battery according to the second embodiment of the present invention will be described. FIG. 7 is a schematic longitudinal sectional view showing the secondary battery 2 of the second embodiment. In the secondary battery 2 of the present embodiment, the battery container 20 includes an inner case 201, an outer case 202, and an outer lid member 203, similar to the secondary battery 1 of the first embodiment shown in FIG. The configuration of the inner case 201 is different from that of the first embodiment. In addition, since the other structure and its effect are the same as 1st Embodiment, the code | symbol same as FIG. 2 is attached | subjected and description is abbreviate | omitted here.

  As shown in FIG. 7, the inner case 201 of the present embodiment is not provided with the vibration absorbing portion 101a at the opening edge as in the first embodiment, and has a uniform cross section along the height direction. It has a shape. According to such a configuration, since the shape of the inner case 201 is simple, there is an advantage that the manufacturing process can be simplified. In such a configuration, since it is easily affected by vibrations in the vertical direction, when designing the inner case 201, select a material and thickness that do not cause buckling or bending due to contact with the outer lid member 203. It is preferable to do.

  Next, the structure of the battery according to the third embodiment of the invention will be described. FIG. 8 is a schematic longitudinal sectional view showing the secondary battery 3 of the third embodiment. In the secondary battery 3 of the present embodiment, the battery container 30 includes an inner case 301, an outer case 302, and an outer lid member 303, similar to the secondary battery 1 of the first embodiment shown in FIG. The configuration of the inner case 301 is different from that of the first embodiment. In addition, since the other structure and its effect are the same as 1st Embodiment, the code | symbol same as FIG. 2 is attached | subjected and description is abbreviate | omitted here.

  As shown in FIG. 8, the inner case 301 of the present embodiment has a horizontal positioning piece 301c fixed thereto by welding or the like so as to protrude from the bottom side. According to such a configuration, as in the first embodiment, the inner case 301 is positioned in the horizontal direction by the vibration absorbing portion 301a coming into contact with the upper corner portion 303b of the outer lid member 303. In addition to this, the horizontal positioning piece 301c comes into contact with the inner side surface of the outer case 302, whereby the horizontal positioning piece 301c is more reliably positioned in the horizontal direction. Therefore, even if the vibration in the horizontal direction acts, there is an advantage that the inner case 301 is less likely to roll inside the outer case 302 and the outer lid member 303, and the battery performance is not easily affected by the vibration. In addition, the shape, the number, the formation position, and the like of the horizontal positioning piece 301c are not limited to this embodiment, and can be appropriately changed in design.

  Next, the structure of the battery according to the fourth embodiment of the invention will be described. FIG. 9 is a schematic longitudinal sectional view showing the secondary battery 4 of the fourth embodiment. As in the secondary battery 1 of the first embodiment shown in FIG. 2, in the secondary battery 4 of the present embodiment, the battery container 40 includes an inner case 401, an outer case 402, and an outer lid member 403. The configuration of the outer case 402 is different from that of the first embodiment. In addition, since the other structure and its effect are the same as 1st Embodiment, the code | symbol same as FIG. 2 is attached | subjected and description is abbreviate | omitted here.

  As shown in FIG. 9, the outer case 402 of the present embodiment has a horizontal positioning piece 402c fixed thereto by welding or the like so as to protrude sideways from the inner surface near the bottom. According to such a configuration, the inner case 401 has a horizontal direction extending from the outer case 402 with respect to its outer surface in addition to the positioning effect in the horizontal direction by the vibration absorbing portion 401a, as in the third embodiment. When the positioning piece 402c abuts, the positioning piece 402c is more reliably positioned in the horizontal direction. Therefore, even if the vibration in the horizontal direction acts, there is an advantage that the inner case 401 is less likely to roll inside the outer case 402 and the outer lid member 403, and the battery performance is not easily affected by the vibration. In addition, the shape, the number, the formation position, and the like of the horizontal positioning piece 402c are not limited to this embodiment, and can be appropriately changed in design. Although not shown in detail in the figure, the horizontal positioning piece 402c may be provided so as to protrude from the inner surface of the external lid member 403. However, it is possible to position the inner case 401 more stably by providing the outer case 402 and supporting the lower side of the inner case 401 as in the present embodiment. Note that this embodiment can be combined with the third embodiment.

  Next, the structure of the battery according to the fifth embodiment of the invention will be described. FIG. 10 is a schematic longitudinal sectional view showing the secondary battery 5 of the fifth embodiment. In the secondary battery 5 of the present embodiment, the battery container 50 includes an inner case 501, an outer case 502, and an outer lid member 503, similar to the secondary battery 1 of the first embodiment shown in FIG. The configuration of the battery container 50 is different from that of the first embodiment. In addition, since the other structure and its effect are the same as 1st Embodiment, the code | symbol same as FIG. 2 is attached | subjected and description is abbreviate | omitted here.

  As shown in FIG. 10, the inner case 501 of the present embodiment has a clearance securing protrusion 501 d fixed thereto by welding or the like so as to protrude downward from the bottom. According to such a configuration, the inner case 501 is held in a state in which the bottom portion of the inner case 501 is separated from the bottom portion of the outer case 502 by a predetermined distance by the clearance securing protrusion 501d coming into contact with the bottom surface of the outer case 502. The Then, after welding the outer case 502 and the outer lid member 503 and coating the outer surface thereof with resin, the electrolyte solution 12 is also filled in the gap 504 between the bottom of the inner case 501 and the bottom of the outer case 502. Is done. Thereby, compared with the case where the entire bottom of the inner case 501 is in contact with the bottom of the outer case 502 as in the first embodiment, the heat of the outer case 502 is increased during the resin coating operation and the welding operation. There is an advantage that the battery performance is less likely to be affected by heat. The shape, the number, the formation position, and the like of the clearance securing protrusion 501d are not limited to this embodiment, and can be changed as appropriate. Further, this embodiment can be combined with the third embodiment or the fourth embodiment.

  Next, the structure of the battery according to the sixth embodiment of the invention will be described. FIG. 11 is a schematic longitudinal sectional view showing the secondary battery 6 of the sixth embodiment. In the secondary battery 6 of the present embodiment, the battery container 60 includes an inner case 601, an outer case 602, and an outer lid member 603, similar to the secondary battery 1 of the first embodiment shown in FIG. The configuration of the outer case 602 is different from that of the first embodiment. In addition, since the other structure and its effect are the same as 1st Embodiment, the code | symbol same as FIG. 2 is attached | subjected and description is abbreviate | omitted here.

  As shown in FIG. 11, the outer case 602 of the present embodiment has a clearance securing protrusion 602d secured thereto by welding or the like so as to protrude upward from the bottom thereof. According to such a configuration, the inner case 601 is in a state in which the bottom portion of the inner case 601 is separated from the bottom portion of the outer case 602 by a predetermined distance when the clearance securing protrusion 602 d extending from the outer case 602 contacts the bottom surface. Held in. Then, after the outer case 602 and the outer lid member 603 are welded and the outer surfaces thereof are coated with resin, the electrolyte solution 12 is also present in the gap 604 between the bottom of the inner case 601 and the bottom of the outer case 602. Filled. Thereby, the same effect as 5th Embodiment is acquired. It is to be noted that the clearance securing protrusion 602d can be appropriately changed in design and can be combined with the third embodiment or the fourth embodiment in the same manner as the fifth embodiment.

  Next, the structure of the battery according to the seventh embodiment of the invention will be described. FIG. 12 is a schematic longitudinal sectional view showing the secondary battery 7 of the seventh embodiment. In the secondary battery 7 of the present embodiment, the battery container 70 includes an inner case 701, an outer case 702, and an outer lid member 703, similar to the secondary battery 1 of the first embodiment shown in FIG. The configuration of the inner case 701 is different from that of the first embodiment. In addition, since the other structure and its effect are the same as 1st Embodiment, the code | symbol same as FIG. 2 is attached | subjected and description is abbreviate | omitted here.

  As shown in FIG. 12, the inner case 701 of the present embodiment has a vibration absorbing portion 701d that protrudes laterally at the bottom, separately from the vibration absorbing portion 701a provided at the opening edge. Is provided. The vibration absorbing portion 701d has a substantially U-shaped cross section and can be elastically deformed so as to narrow the U-shaped opening with respect to the action of vibration in the vertical direction. The vibration absorbing portion 701d is in close contact with the lower corner portion 702e of the outer case 702 when the inner case 701 is stored in the outer case 702. According to such a configuration, even when vibrations in the vertical direction act, the vibrations are absorbed not only by the vibration absorbing unit 701a but also by the vibration absorbing unit 701d. Thereby, the vertical movement of the inner case 701 is more reliably suppressed, and the battery performance can be maintained satisfactorily. Further, as described above, in addition to the horizontal positioning effect by the vibration absorbing portion 701a, the vibration absorbing portion 701d is brought into close contact with the lower corner portion 702e of the outer case 702, so that the inner case 701 is more reliably placed in the horizontal direction. Positioned. Therefore, even when horizontal vibration is applied, the inner case 701 is less likely to roll within the outer case 702 and the outer lid member 703, and the battery performance is less susceptible to vibration. Further, the inner case 701 is held in a state in which the bottom portion of the inner case 701 is separated from the bottom of the outer case 702 by a predetermined distance by the vibration absorbing portion 701d coming into close contact with the lower corner portion 702e of the outer case 702. Thereby, similarly to the fifth embodiment, there is an advantage that heat of the outer case 702 is not easily transmitted to the inner case 701 during the resin coating work or the welding work. It should be noted that an elastic member such as a leaf spring is interposed between the bottom portion of the inner case 701 and the bottom portion of the outer lid member 703 in addition to the vibration absorbing portion 701d as a part of the inner case 701 as in the present embodiment. You may let them.

  Next, the structure of the battery according to the eighth embodiment of the invention will be described. FIG. 13 is a schematic longitudinal sectional view showing the secondary battery 8 of the eighth embodiment. The secondary battery 8 of the present embodiment is the secondary battery of the first embodiment shown in FIG. 2 in that the battery container 80 is composed of an inner case 801, an outer case 802, an outer lid member 803, and a solidifying material 804. It is different from 1. In addition, since the other structure and its effect are the same as 1st Embodiment, the code | symbol same as FIG. 2 is attached | subjected and description is abbreviate | omitted here.

  The solidified material 804 of this embodiment is for containing the welding spatter S in the gap 116 between the outer case 802 and the inner case 801. In the present embodiment, cement milk formed by mixing cement and water is used as the solidifying material 804, and as shown in FIG. 13, the gap 116 between the inner case 801 and the outer case 802, and the inner case 801 and the outer case The solidified material 804 is filled in the gap 117 between the lid member 803 and the lid member 803. More specifically, as described above, during the welding operation of the outer case 802 and the outer lid member 803, the welding spatter S is introduced into the battery container 80 from a minute gap (not shown) generated in the joint portion 805 of the both. invade. And when this welding spatter S penetrate | invades to the inside of the inner case 801, battery performance may fall. Therefore, in the first to seventh embodiments, welding spatter penetrates into the inner case by bringing the entire opening edge of the inner case into close contact with the inner surface of the outer lid member and sealing the inner case. Is preventing. On the other hand, in this embodiment, cement milk is poured from above the welding spatter S accumulated on the bottom of the outer case 802, cured for a predetermined time and solidified, so that the welding spatter S is made of the solidified cement with the inner case 801. It is enclosed in the gap 116 outside. This prevents welding spatter S from entering the inner case 801 and the inner case 801 is fixed to the outer case 802 and the outer lid member 803 by the solidified cement, so that the inner case 801 moves up and down. And rolls are prevented. Since the welding spatter S is sealed by the cement in this way, the opening edge of the inner case 801 is not brought into close contact with the inner side surface of the outer lid member 803, and the inside of the inner case 801 is not sealed. Of course, the inside of the inner case 801 may be sealed as in the first to seventh embodiments.

  The solidifying material 804 is not limited to the cement milk of the present embodiment, and any substance having a property that changes from a liquid state to a solid state or a gel state with the passage of time can be used. However, if the inside of the inner case 801 is not sealed, there is a possibility that it will come into contact with the electrolyte solution 12 that has flowed out of the inside of the inner case 801. Therefore, the solidifying material 804 has a characteristic that does not chemically react with the electrolyte solution 12. Is preferred. In this embodiment, the gap 117 between the outer lid member 803 and the inner case 801 is also filled with the solidified material 804. However, if it is possible to prevent the welding spatter S from entering the inner case 801, The solidifying material 804 may be filled only in the gap 116 between the outer case 802 and the inner case 801.

  It should be noted that the shapes, combinations, work procedures, and the like of the constituent members shown in the above-described embodiments are merely examples, and various changes can be made based on design requirements and the like without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Battery 101 ... Inner case 102 ... Outer case 103 ... Outer cover member 111 ... Electrode plate 119 ... Electrode body

Claims (10)

An electrode body having a positive electrode plate, a negative electrode plate and a separator;
An inner case that houses the electrode body and is open at the top;
An outer case that covers the inner case from below;
An outer lid member that covers the inner case from above and has a lower end fixed to the outer case by welding at a position lower than the opening position of the inner case;
A battery comprising:   The battery according to claim 1, wherein the entire opening edge portion of the inner case is in close contact with the inner side surface of the outer lid member.   The battery according to claim 2, wherein a gap between the outer case and the inner case is filled with a liquid having thermal conductivity.   3. The battery according to claim 1, wherein the gap between the outer case and the inner case is filled with a solidifying material that encloses the mixed foreign matter into the gap. .   The battery according to any one of claims 2 to 4, wherein a vibration absorbing portion that is elastically deformable with respect to vibration in the vertical direction is provided at an opening edge portion of the inner case.   6. The vibration absorbing portion that is in contact with the bottom of the outer case and is elastically deformable with respect to vibration in the vertical direction is provided at the bottom of the inner case. The battery according to item.   The horizontal direction positioning piece which protrudes to the outer surface of the said inner case and contacts the inner surface of the said outer case or the said outer cover member is provided in any one of Claim 1 thru | or 6 characterized by the above-mentioned. The battery according to item.   The horizontal positioning piece which protrudes to the side and contacts the outer surface of the inner case is provided on the inner surface of the outer case or the outer lid member. The battery according to item. The battery according to any one of claims 1 to 8, wherein a protrusion for fixing the electrode body so as not to move is provided on an inner surface of the inner case.   The battery according to any one of claims 1 to 9, wherein a resin is coated on outer surfaces of the outer case and the outer lid member.

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