JP2017143030A - Layered battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a layered battery that hinders non-uniform potential and layer displacement in an electrode body while using a layered electrode body.SOLUTION: The invention is directed to a layered battery having: a layered electrode body formed by alternately layering rectangular positive negative electrode plates together with a separator; and an external body 2 accommodating the layered electrode body. Each of the positive and negative electrode plates is provided with a belt-like non-coated area connecting the respective middle parts of both edges opposite each other. The non-coated area also has a through-hole not in the middle between both the edges but at the side of one of the edges. In the separator, through-holes are formed on both sides sandwiching the middle between both the edges, in an area corresponding to the non-coated area. In the layered electrode, current collector foils of the positive (negative) electrode plates conduct without contacting the negative (positive) electrode plates through the through holes of the separators. An external terminal 4(5) is connected to a conducting area of the current collector foils of the positive (negative) electrode of the external body 2 via an internal terminal passing through the external body 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a stacked battery in which positive and negative electrode plates are alternately stacked and further housed in an exterior body. More specifically, the present invention relates to a laminated battery having a laminated electrode body using rectangular sheets as positive and negative electrode plates to be laminated.

  As an example of this type of conventional stacked battery, the one described in Patent Document 1 can be cited. The “secondary battery 10” of FIG. 1 of the same document has a structure in which an “electrode assembly 14” (stacked electrode body) in which positive and negative electrode sheets and separators are stacked is housed in a “case 11”. . Here, a “positive electrode current collecting tab 31” and a “negative electrode current collecting tab 32” are provided on one end side of the electrode assembly 14. Via these current collecting tabs, the positive and negative electrode sheets of the electrode assembly 14 are connected to the external “positive terminal 41” and “negative terminal 42”.

JP 2014-11040 A

  However, the above-described conventional technology has a problem that the battery performance cannot be obtained as expected. The cause is considered to be that the potential unevenness occurs due to the site in the electrode assembly 14. That is, in the electrode assembly 14 of Patent Document 1, the current collecting tab is provided on one end side, both positive and negative. For this reason, even within the electrode assembly 14, the distance from the current collecting tab varies greatly depending on the site. This caused potential unevenness in the electrode assembly 14 and led to a decrease in battery performance. In addition, the moment of inertia of the electrode assembly is large when viewed from the position of the current collecting tab, and the electrode sheet or separator may be misaligned due to vibration or impact. In particular, when the plate surface area of the electrode sheet in the electrode assembly 14 is large, these problems are remarkable.

  The present invention has been made to solve the above-described problems of the prior art. That is, an object of the present invention is to provide a laminated battery that uses a laminated electrode body and suppresses potential unevenness and lamination deviation within the electrode body.

  The laminated battery according to one aspect of the present invention is a laminated electrode obtained by alternately laminating positive and negative electrode plates coated with an active material layer on the surface of a rectangular current collector foil with a separator interposed therebetween. The battery has a structure having a body and an exterior body that houses the laminated electrode body, and both positive and negative electrode plates are provided in a belt-like shape by connecting an intermediate location on one side and an intermediate location on the opposite side. The non-coated area where the current collector foil is exposed without the active material layer and the center between one side and the opposite side in the non-coated area are not included, and either the one side or the opposite side There is a penetrating part that penetrates between the front and back sides, provided in the close range, and the separator sandwiches the center between one side and the opposite side in the area corresponding to the non-coated area Within both ranges, there are through-holes that penetrate between the front and back sides. In the body, the non-coated areas of positive electrode plates (hereinafter referred to as “positive electrode plates”) are in contact with the negative electrode plates through the negative electrode plates (hereinafter referred to as “negative electrode plates”) and through portions of the separator. And the non-coated areas of the negative plates pass through the positive plate and the through-holes of the separator and are not in contact with the positive plate. A positive electrode terminal member connected to a conduction point between regions and a negative electrode terminal member connected to a conduction point between non-coating regions of the negative electrode plate inside the exterior body are provided through the exterior body. Is.

  In the multilayer battery according to the above aspect, the positive and negative electrode plates of the multilayer electrode body are each provided with a strip-shaped non-coating region connecting an intermediate location on one side and an intermediate location on the opposite side. And in the non-coating area | region, the penetration location is provided near either one side or an opposite side. In the laminated electrode body, the non-coating regions of the positive and negative electrode plates are overlapped with each other, and the through portions thereof are alternately arranged. In the separator between the positive and negative electrode plates, through portions are formed at both a portion corresponding to the through portion of the positive electrode plate and a portion corresponding to the through portion of the negative electrode plate. For this reason, in the penetration part of a positive electrode plate, the separator is also a penetration part, and only the non-coating area | region of a negative electrode plate has overlapped. The location where the negative electrode terminal member is connected to this location is the current collector foils of the negative electrode plates and the junction location between them and the negative electrode terminal member. Similarly, the separator is also a penetration location at the penetration location of the negative electrode plate. For this reason, only the non-coating region of the positive electrode plate overlaps at this point. The location where the positive electrode terminal member is connected to this location is the current collector foils of the positive electrode plates and the junction location between them and the positive electrode terminal member.

  Due to the above configuration, the junction between the current collector foil and the positive and negative terminal members is present in a band-like region connecting the intermediate location on one side of the laminated electrode body and the intermediate location on the opposite side. Therefore, there are the following differences as compared to the case where these joints are provided side by side on one side of the multilayer electrode body. First, the difference in the distance between each location in the laminated electrode body and the aforementioned junction location is small. For this reason, there is little potential non-uniformity in the stacked electrode body during use. In addition, the moment of inertia of the laminated electrode body centering on the joint is small. For this reason, the stacking deviation between the positive and negative electrode plates and the separator when a vibration or impact is applied is small.

  In the multilayer battery according to the above aspect, the positive electrode plate and the negative electrode plate are non-square having a long side and a short side, and the non-coated region is formed between the long side and the long side. It is desirable that This is because when the arrangement of the non-coating region is as described above, the effect of reducing the difference in the distance between each location and the junction location in the stacked electrode body is greater. In addition, the effect of reducing the moment of inertia of the laminated electrode body centering on the joint is greater.

  In the multilayer battery according to the above aspect, the exterior body includes a first surface member that covers a first surface parallel to the positive and negative electrode plates of the multilayer electrode body, and a second surface opposite to the first surface of the multilayer electrode body. And a concave portion that accommodates at least a part of the laminated electrode body in the thickness direction is formed on the first surface member, and among the concave portions, the laminated electrode body is formed. A terminal member arrangement portion having a depth smaller than that of the other portion in the recess is formed at both ends of the region corresponding to the non-coated region, and both the positive terminal member and the negative terminal member are first surface members. It is desirable that the portion outside the first surface member is disposed in the terminal member arrangement portion while being provided through the terminal member.

  This has the following advantages. First, the process of storing the laminated electrode body in the exterior body is easier than in the case of insertion into a thin box-shaped exterior body. In addition, the first surface member having the concave portion as described above can be easily manufactured from a flat thin plate member by press molding or the like. Moreover, the rigidity as the whole first surface member is improved by forming the terminal member arrangement portion having a depth smaller than that of other portions in the recess. Of course, this also improves the rigidity of the stacked battery itself. Moreover, the position where the terminal member arrangement | positioning part is formed is corresponded to the non-coating area | region where the active material layer is not coated in the positive / negative electrode plate of a laminated electrode body. For this reason, the presence of the terminal member arrangement portion does not interfere with the storage of the laminated electrode body. Furthermore, the terminal member arrangement portion is concave on the outer surface side of the first surface member. Here, a portion of the positive electrode terminal member and the negative electrode terminal member outside the first surface member is disposed. For this reason, the flatness on the outer shape of the stacked battery is not much harmed by the positive electrode terminal member and the negative electrode terminal member.

  In the multilayer battery having the above-mentioned limitation on the outer package, it is desirable that the concave portion of the first surface member is formed to a depth that accommodates the entire thickness of the multilayer electrode body. With such a configuration, the second surface member can be a simple flat plate member, which is easy to manufacture.

  According to this configuration, there is provided a laminated battery that uses a laminated electrode body and suppresses potential unevenness and lamination deviation within the electrode body.

It is a perspective view which shows the external appearance of the laminated battery which concerns on embodiment. It is a schematic sectional drawing of the laminated battery which concerns on embodiment. It is a perspective view of the laminated electrode body of the laminated battery which concerns on embodiment. It is the top view and sectional drawing of the positive electrode plate in the laminated battery which concern on embodiment. It is the top view and sectional drawing of the negative electrode plate in the laminated battery which concern on embodiment. It is a top view of the separator in the laminated battery which concerns on embodiment. It is sectional drawing of the laminated electrode body of the laminated battery which concerns on embodiment. It is a perspective view (the 1) of the 1st surface member in the laminated battery which concerns on embodiment. It is a perspective view (the 2) of the 1st surface member in the laminated battery which concerns on embodiment. It is a perspective view of the 2nd surface member in the laminated type battery which concerns on embodiment. It is a perspective view (the 1) of the external terminal in the laminated battery which concerns on embodiment. It is a perspective view (the 2) of the external terminal in the laminated battery which concerns on embodiment. It is a top view of the positive electrode plate in the laminated battery which concerns on a modification.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below in detail with reference to the accompanying drawings. In this embodiment, the present invention is applied to a flat battery 1 having a flat plate shape shown in FIG. The laminated battery 1 in FIG. 1 is a battery in which a laminated electrode body 3 (see FIG. 2) described later is accommodated in an exterior body 2. Furthermore, positive and negative external terminals 4 and 5 are attached to the laminated battery 1. The external terminals 4 and 5 are each insulated from the exterior body 2 by the gasket 19. The laminated battery 1 is also provided with a gas discharge valve 6 and a liquid injection port 7.

  A cross-sectional structure of the stacked battery 1 is shown in FIG. FIG. 2 is a cross-sectional view taken along the line AA in FIG. As shown in FIG. 2, the exterior body 2 of the stacked battery 1 includes a first surface member 8 and a second surface member 9. The stacked electrode body 3 housed in the exterior body 2 is formed by alternately stacking positive plates 10 and negative plates 11. A separator 12 is sandwiched between the positive electrode plate 10 and the negative electrode plate 11. In the actual stacked battery 1, the number of positive plates 10 and negative plates 11 may be larger.

  A perspective view of the laminated electrode body 3 is shown in FIG. As shown in FIG. 3, each of the positive electrode plate 10 and the negative electrode plate 11 constituting the laminated electrode body 3 is a rectangular sheet. The laminated electrode body 3 has a thin rectangular parallelepiped shape as a whole. The overall shape of the first surface 13, which is the surface of the largest area, and the second surface 14, which is the back surface thereof, is rectangular, as are the shapes of the individual positive electrode plate 10 and negative electrode plate 11. Of course, the entire shape of the first surface 13 and the second surface 14 is a surface parallel to the individual positive electrode plate 10 and the negative electrode plate 11. The first surface member 8 of the exterior body 2 described above is a member that covers the first surface 13 of the multilayer electrode body 3. Similarly, the second surface member 9 is a member that covers the second surface 14. Each of the positive electrode plate 10 and the negative electrode plate 11 constituting the laminated electrode body 3 is formed with a strip-shaped non-coated region 15 and punched holes 16 and 24 therein.

  The positive electrode plate 10, the negative electrode plate 11, and the separator 12 which comprise the laminated electrode body 3 are demonstrated with reference to FIGS. FIG. 4 is a plan view and a cross-sectional view of the positive electrode plate 10. As shown in FIG. 4, the in-plane shape of the positive electrode plate 10 is a rectangle having a short side 17 and a long side 18. The positive electrode plate 10 is obtained by coating an active material layer 21 on the surface of the current collector foil 20. The positive electrode plate 10 is provided with a non-coating region 15 in a strip shape in a direction connecting the long side 18 and the long side 18. A portion between the non-coating region 15 and the upper and lower short sides 17 is a coating region 23. The non-coating region 15 is a region where there is no active material layer 21 and the current collector foil 20 is exposed. On the other hand, the coating region 23 is a region where the active material layer 21 is present. In addition, the location where the front surface is the non-coating region 15 is the non-coating region 15 on the back surface, and the location where the front surface is the coating region 23 is also the coating region 23.

  In the positive electrode plate 10 in the present embodiment, the non-coating region 15 is provided approximately at the center in the vertical direction in FIG. That is, the non-coating region 15 is provided by connecting intermediate portions of the long sides 18. The allowable range of the ratio of the widths B1 and B2 of the upper and lower coating regions 23 in FIG. 4 is 3.5: 6.5 to 6.5: 3.5. Further, a punched hole 16 is formed in the non-coated region 15 in the positive electrode plate 10 (current collector foil 20). A portion between the front side and the back side of the positive electrode plate 10 penetrates through the hole 16. The punch hole 16 is formed at a position close to one of the long sides 18 (left side in FIG. 4) in the non-coating region 15. However, the punched hole 16 does not reach the midpoint X in the left-right direction in the non-coating region 15.

  FIG. 5 shows a plan view and a cross-sectional view of the negative electrode plate 11. The negative electrode plate 11 is also similar in structure and shape to the positive electrode plate 10. That is, the negative electrode plate 11 is obtained by coating the active material layer 22 on the surface of the rectangular current collector foil 25. Similarly to the positive electrode plate 10, the negative electrode plate 11 is also provided with a non-coating region 15 and a coating region 23. And when the positive electrode plate 10 and the negative electrode plate 11 are piled up, the non-coating regions 15 overlap each other at the same position. However, the hole 24 of the negative electrode plate 11 (current collector foil 25) is formed at a position close to the long side 18 on the right side in FIG.

  In addition, the material of the positive electrode plate 10 and the negative electrode plate 11 may be a general material corresponding to the type of the stacked battery 1. When the type of the laminated battery 1 is a lithium ion secondary battery, generally, the current collector foil 20 of the positive electrode plate 10 is an aluminum foil, and the positive electrode active material that is the main component of the active material layer 21 of the positive electrode plate 10 is The lithium composite metal oxide, the current collector foil 25 of the negative electrode plate 11 is a copper foil, and the negative electrode active material which is the main component of the active material layer 22 of the negative electrode plate 11 is graphite.

  FIG. 6 shows a plan view of the separator 12. The in-plane shape of the separator 12 is also substantially the same rectangle as the positive electrode plate 10 and the negative electrode plate 11. The separator 12 is a general porous insulating resin film in terms of material. In the separator 12, two punched holes 26 and 27 are formed. When the separator 12 is overlapped with the positive electrode plate 10 and the negative electrode plate 11, the hole 26 overlaps the hole 16 of the positive electrode plate 10 and the hole 27 overlaps the hole 24 of the negative electrode plate 11. Has been.

  FIG. 7 shows a cross-sectional view taken along the line CC in FIG. 3 in the laminated electrode body 3 in which the positive electrode plate 10, the negative electrode plate 11, and the separator 12 are laminated. This location is a location of the non-coated region 15 in the positive electrode plate 10 and the negative electrode plate 11. Accordingly, neither the active material layer 21 of the positive electrode plate 10 nor the active material layer 22 of the negative electrode plate 11 appears in the cross-sectional view of FIG. As shown in FIG. 7, the laminated electrode body 3 at this point is a laminated body of the current collector foil 20 (positive), the current collector foil 25 (negative), and the separator 12.

  In the position on the left side in FIG. 7, the hole 24 is overlapped with the current collector foil 25, and the hole 27 is overlapped with the separator 12. For this reason, only the current collector foil 20 exists at this position. On the other hand, in the position on the right side in FIG. 7, the hole 16 is overlapped with the current collector foil 20, and the hole 26 is overlapped with the separator 12. For this reason, only the current collector foil 25 exists at this position. Further, at any position, contact between the current collector foil 20 and the current collector foil 25 is prevented by the separator 12. Note that it is desirable that the punch hole 27 is slightly smaller than the punch hole 24 and the punch hole 26 is slightly smaller than the punch hole 16. This is because it is more advantageous to reliably prevent the contact between the current collector foil 20 and the current collector foil 25.

  In FIG. 7, an internal terminal 37 is attached to the left side of the punching hole 24. And the range shown with the broken line D in a figure is welded. As a result, all the current collector foils 20 (positive) laminated on the laminated electrode body 3 at this location are electrically connected to each other, and the internal terminal 37 is also connected to that location. Similarly, an internal terminal 38 is attached to the position of the right side punch hole 16 in FIG. And the range shown with the broken line E in a figure is welded. As a result, all the current collector foils 25 (negative) laminated on the laminated electrode body 3 are conducted at this location, and the internal terminal 38 is also connected to that location.

  The perspective view of the 1st surface member 8 of the exterior body 2 before an assembly | attachment is shown to FIG. 8 and FIG. FIG. 8 is a perspective view of the first surface member 8 viewed from the outer surface side, and FIG. 9 is a perspective view of the first surface member 8 viewed from the inner surface side. The first surface member 8 is a rectangular member as a whole. The first surface member 8 has a flat portion 28 having four sides and a concave portion 29 surrounded by the flat portion 28. In terms of area, the recess 29 occupies most of the first surface member 8. The concave portion 29 is a state in the situation seen from the inner surface side of FIG. 9, and in FIG. 8, the concave portion 29 has a convex shape. Since the concave portion 29 is a portion for housing the laminated electrode body 3, the concave portion 29 is called in a manner viewed from the inner surface side. For this reason, the dimensions F and G in the in-plane direction of the concave portion 29 are sufficient to accommodate the laminated electrode body 3. The depth of the recess 29 is also set to a depth at which the stacked electrode body 3 can be completely accommodated. The first surface member 8 is originally a flat plate-shaped thin plate member, and has a recess 29 formed by press molding.

  Convex portions 30, 31, and 32 are further formed in the concave portion 29 of the first surface member 8. The convex portions 30, 31, and 32 are portions having a smaller depth than other portions in the concave portion 29. In FIG. 9, the protrusions 30, 31, and 32 are called out because they appear to protrude. In FIG. 8, the convex portions 30, 31, and 32 appear to be recessed. The convex portions 30 and 31 are portions for attaching the external terminals 4 and 5. That is, the external terminals 4 and 5 in the attached state are accommodated in the portions that are recessed by the convex portions 30 and 31 in FIG. Furthermore, holes 33 and 34 for conduction are formed in the convex portions 30 and 31. The convex portions 30 and 31 are formed in contact with the long sides 35 and 36 of the concave portion 29. The convex part 32 is located between the convex parts 30 and 31. The convex portion 32 is formed with a gas discharge valve 6 and a liquid injection port 7. The convex portions 30, 31, and 32 are all in a range facing the non-coated region 15 when the laminated electrode body 3 is stored in the concave portion 29.

  A perspective view of the second surface member 9 is shown in FIG. As shown in FIG. 10, the second surface member 9 is a simple flat plate member.

  Next, the internal terminals 37 and 38 will be described. The internal terminals 37 and 38 have substantially the same shape and will be described together. FIG. 11 is a perspective view of the internal terminals 37 and 38 in a state before assembly. As shown in FIG. 11, the internal terminals 37 and 38 are constituted by a tab portion 39 and a rivet portion 40. The tab portion 39 is a portion of the internal terminals 37 and 38 that is joined to the current collector foils 20 and 25 as indicated by broken lines D and E in FIG. The rivet portion 40 is a portion that penetrates the exterior body 2. The rivet portion 40 further has a function of fixing the external terminals 4 and 5 so as not to be detached from the exterior body 2. For this reason, the rivet portion 40 is subjected to caulking processing later, and a cap portion 41 is formed as shown in FIG.

  The external terminals 4 and 5 are rectangular tab-shaped members. However, although not visible in the external perspective view of FIG. 1, holes for passing the rivet portions 40 of the internal terminals 37 and 38 are formed. The entirety of the internal terminal 37 and the external terminal 5 constitutes a positive electrode terminal member. Similarly, the internal terminal 38 and the external terminal 5 as a whole constitute a negative electrode terminal member. Regarding the material, the internal terminal 37 and the external terminal 4 are made of the same type of metal material as the current collector foil 20, and the internal terminal 38 and the external terminal 5 are made of the current collector foil 25.

  In the assembly process of the laminated battery 1 of this embodiment, the internal terminals 37 and 38 are first subjected to welding indicated by broken lines D and E in FIG. There are no particular limitations on the welding method, such as laser welding, ultrasonic welding, or resistance welding. Thereby, the internal terminal 37 and all the current collector foils 20 (positive) of the laminated electrode body 3 are brought into conduction. Further, the internal terminal 38 is electrically connected to all the current collector foils 25 (negative) of the multilayer electrode body 3. Then, the laminated electrode body 3 to which the internal terminals 37 and 38 are attached is housed in the recess 29 of the first surface member 8 shown in FIG. At that time, the rivet portions 40 of the internal terminals 37 and 38 are passed through the holes 33 and 34. Further, the gasket 42 shown in FIG. 7 is sandwiched between the tab portion 39 of the internal terminals 37 and 38 and the convex portions 30 and 31 of the first surface member 8. Then, the laminated electrode body 3 is completely accommodated in the recess 29. Further, the rivet portion 40 protrudes from the holes 33 and 34 in FIG. External terminals 4 and 5 and a gasket 19 (see FIG. 1) are attached thereto.

  In this state, a caulking process is performed in which the tip portion of the rivet portion 40 is expanded in the radial direction and crushed in the height direction. By the caulking process, the tip portion of the rivet portion 40 is deformed to form the cap portion 41 shown in FIG. In FIG. 12, only the internal terminals 37 and 38 after crimping are drawn, but actually, the first surface member 8 and the gaskets 19 and 42 are sandwiched between the tab portion 39 and the cap portion 41 after crimping. ing. Thereby, the external terminals 4 and 5 are securely attached to the first surface member 8 so as not to be detached. In this state, the rivet portions 40 of the internal terminals 37 and 38 penetrate between the front and back surfaces of the first surface member 8. The gaskets 19 and 42 insulate the external terminals 4 and 5 and the internal terminals 37 and 38 from the first surface member 8.

  Then, the second surface member 9 shown in FIG. 10 is joined to the flat portions 28 on the four sides of the first surface member 8. As a result, the laminated electrode body 3 is enclosed in the exterior body 2. FIG. 1 shows a state in which this is turned upside down. In this state, the positive and negative external terminals 4 and 5 have a shape that protrudes outward one by one from one long side 18 (see FIG. 4) and the opposite side of the multilayer electrode body 3. In this state, the stacked battery 1 is completed in terms of its outer shape. Thereafter, the electrolytic solution is injected using the liquid injection port 7 and impregnation and initial activation treatment are performed, so that the laminated battery 1 is ready for use.

  As described in detail above, according to the present embodiment, as shown in FIGS. 4 and 5, the intermediate portions of the long sides 18 are connected to each other as the electrode plates 10 and 11 constituting the multilayer electrode body 3. The non-coating region 15 is formed. In the non-coating region 15, punched holes 16 and 24 are provided at positions that are offset from one long side 18. The separator 12 is also provided with punched holes 26 and 27 (FIG. 6). As a result, the laminated electrode body 3 has a location where only the current collector foil 20 is laminated (left side in FIG. 7) and a location where only the current collector foil 25 is laminated (right side in FIG. 7). ing. And the internal terminal 37 and the internal terminal 38 are joined to those places. As a result, the junctions between the current collector foils 20 and 25 and the internal terminals 37 and 38 are positioned on the line connecting the intermediate points of the long sides 18 of the electrode plates 10 and 11.

  For this reason, compared with the case where the junction location between the current collector foil and the current collector terminal is arranged on the short side of the electrode plate, the distance from the junction location in the laminated electrode body 3 is less. The balance is decreasing. This is because the maximum distance from the joint in the multilayer electrode body 3 is halved in the comparison. For this reason, in use, potential unevenness in the multilayer electrode body 3 can be reduced accordingly. As a result, a stacked battery 1 that can sufficiently obtain battery performance is realized. Further, the moment of inertia of the laminated electrode body 3 centering on the joint location is also smaller than in the case where the joint location is provided on the short side. For this reason, in this embodiment, the stacking displacement of the electrode plates 10 and 11 and the separator 12 when a vibration or impact is applied to the stacked battery 1 from the outside is small.

  In the present embodiment, convex portions 30, 31, and 32 are provided in the concave portion 29 of the first surface member 8. The external terminals 4 and 5 are accommodated on the back surfaces (external side) of the convex portions 30 and 31. For this reason, when viewed in the thickness direction of the multilayer battery 1, the external terminals for the portions other than the convex portions 30, 31, 32 in the concave portion 29 of the first surface member 8 forming the maximum area surface of the multilayer battery 1 The projecting amount due to 4 and 5 is small. If the depth of the recesses on the back side of the protrusions 30, 31 is equal to or greater than the total thickness of the external terminals 4, 5, the gasket 19 and the cap 41, the cap 41 has the protrusions 30, 31, 32 of the recess 29. It becomes the structure which does not protrude with respect to other parts. FIG. 1 is drawn under such an assumption.

  In the present embodiment, naturally, the protrusions 30 and 31 are located within the range in which the non-coating region 15 is laminated in the laminated electrode body 3 from the above configuration. Therefore, in this part, the laminated electrode body 3 can be compressed without difficulty in the thickness direction as compared with other parts. This is because there are no active material layers 21 and 22. For this reason, even if the protruding portions 30 and 31 protruding from the inner surface side are present, it does not disturb the housing of the laminated electrode body 3 in the exterior body 2. In this embodiment, the convex portion 32 is also present within the non-coating region 15. Therefore, the convex portion 32 does not interfere with the storage of the laminated electrode body 3. Further, providing the convex portions 30, 31, 32 on a part of the concave portion 29 itself contributes to improving the rigidity of the first surface member 8. Further, in the present embodiment, the concave portion 29 of the first surface member 8 is formed to a depth that allows the stacked electrode body 3 to be completely accommodated. For this reason, the second surface member 9 is a simple flat plate member, and there is little trouble in processing parts.

  Note that this embodiment is merely an example, and does not limit the present invention. Therefore, the present invention can naturally be improved and modified in various ways without departing from the gist thereof. For example, in the present embodiment, the above-mentioned non-coating region 15 is provided by connecting intermediate portions of the long side 18 of the multilayer electrode body 3. However, the present invention is not limited to this, and it may be provided so as to connect the intermediate portions of the short sides 17 of the multilayer electrode body 3. In this case, the positive and negative external terminals 4 and 5 also have a shape projecting outward one by one from one short side 17 and its opposite side in the multilayer electrode body 3. Even in such a case, the above-described potential unevenness in the multilayer electrode body 3 is compared with the case where the junction between the current collector foil and the external terminal is provided on the long side of the electrode plate. And the effect of reducing the moment of inertia of the laminated electrode body 3 around the joint. The laminated electrode body 3 may be square. The protruding positions of the external terminals 4 and 5 may be offset to some extent within the range of the width of the non-coating region 15.

  In the present embodiment, as shown in FIGS. 4 and 5, the hole 16 of the positive electrode plate 10 and the hole 24 of the negative electrode plate 11 are formed in a window shape not connected to the outside. However, the present invention is not limited to this, and the positive electrode plate 10 may be a tab-shaped hole connected to the outside as illustrated in FIG. 13. In this case, the punched holes 26 and 27 of the separator 12 may be similarly tabbed.

DESCRIPTION OF SYMBOLS 1 Stacked battery 2 Exterior body 3 Stacked electrode body 4, 5 External terminal 8 First surface member 9 Second surface member 10 Positive electrode plate 11 Negative electrode plate 12 Separator 13 First surface 14 Second surface 15 Uncoated region 16, 24 Punching hole 17 Short side 18 Long side 20 and 25 Current collector foils 21 and 22 Active material layer 23 Coating region 26 and 27 Punching hole 29 Recess 30 and 31 Projection 37 and 38 Internal terminal H Depth

Claims (4)

A stacked electrode body in which positive and negative electrode plates coated with an active material layer on the surface of a rectangular current collector foil are alternately stacked with a separator interposed therebetween, and the stacked electrode body are accommodated In a laminated battery having an exterior body,
Both the positive and negative electrode plates
An uncoated region in which the current collector foil is exposed without the active material layer provided in a band shape by connecting an intermediate location on one side and an intermediate location on the opposite side;
In the non-coating region, a penetrating portion that does not include the center between the one side and the opposite side and is provided in a range close to either the one side or the opposite side and penetrates between the front and back sides And are formed,
In the separator, there are formed penetrating portions penetrating between the front and back sides in the range corresponding to the non-coating region and in both ranges sandwiching the center between the one side and the opposite side. And
In the laminated electrode body,
The non-coated areas of the positive electrode plates are electrically connected without contacting the negative electrode plate through the negative electrode plate and the through portion of the separator,
The non-coated areas of the negative electrode plates are electrically connected without contacting the positive electrode plate through the positive electrode plate and the through portion of the separator,
A positive electrode terminal member connected to a conduction location between the non-coated areas of the positive electrode plate inside the exterior body, and a conduction location between the non-coated areas of the negative electrode plate inside the exterior body. A laminated battery, wherein a connected negative electrode terminal member is provided so as to penetrate the outer package. The stacked battery according to claim 1,
The positive and negative electrode plates are non-square having a long side and a short side,
The non-coated region is formed between a long side and a long side, and the laminated battery is characterized in that The stacked battery according to claim 1 or 2,
The exterior body is
A first surface member covering a first surface parallel to the positive and negative electrode plates in the laminated electrode body;
A second surface member covering a second surface opposite to the first surface in the multilayer electrode body,
In the first surface member,
A recess is formed to store at least a part of the thickness direction of the multilayer electrode body,
Of the recesses, terminal member arrangement portions having a depth smaller than other portions in the recesses are formed at both ends of a region corresponding to the non-coated region in the multilayer electrode body,
The positive terminal member and the negative terminal member are both
Provided through the first surface member,
A stacked battery, wherein a portion outside the first surface member is arranged in the terminal member arrangement portion. The stacked battery according to claim 3,
The recessed portion of the first surface member is formed to have a depth that accommodates the entire thickness of the stacked electrode body.

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