JP2019102315A - Electrochemical cell and manufacturing method of the same - Google Patents

Abstract

To provide an electrochemical cell having less positional deviation of a positive electrode main body, and a recipe of the electrochemical cell.SOLUTION: An electrochemical cell comprises: a plurality of positive electrode main bodies arranged in parallel; a daisy chain manner positive electrode having an electrode connection part connecting two adjacent positive electrode main bodies; a plurality of negative electrode bodies arranged in parallel; a daisy chain manner negative electrode having the electrode connection part connecting two adjacent electrode main bodies; and a separator arranged between the positive electrode and the negative electrode. A reference overlapping part is structured by overlapping one or two negative electrode(s) in a middle part of the daisy chain manner to one or two positive electrode(s) in the middle of the daisy chain manner through the separator. The structure is used as the reference, the daisy chain manner positive electrode and the daisy chain manner negative electrode are alternately zigzag-laminated in one side through the separator. The daisy chain manner positive electrode and the daisy chain manner negative electrode are alternately zigzag-laminated in the other side through the separator.SELECTED DRAWING: Figure 8

Description

  The present invention relates to an electrochemical cell and a method of manufacturing an electrochemical cell.

BACKGROUND Conventionally, electrochemical cells such as lithium ion secondary batteries and electrochemical capacitors have been widely used as power sources for small devices such as smartphones, wearable devices, and hearing aids.
In such an electrochemical cell, in order to increase the battery capacity and the charging current and the discharging current, it is necessary to increase the area of the electrodes facing each other in the electrochemical cell. As a structure of the electrochemical cell, a structure is known in which a pair of strip-like electrodes are opposed to each other via a strip-like separator and housed in a case, and the electrode and the separator are impregnated with an electrolytic solution.

For example, a structure in which a strip-like electrode and a strip-like separator are wound and accommodated in a cylindrical or coin-like case, or a structure in which the electrode is deformed into a flat shape and then accommodated in a laminate film is known.
In recent years, in response to the demand for thinning wearable devices, a configuration in which a strip-like electrode and a strip-like separator are in a zigzag shape has been considered. For example, Patent Document 1 below proposes a structure in which strip-like electrodes are accommodated in a separator bag.

JP 2005-243455 A

However, in the configuration in which the strip-like electrode is accommodated in the separator bag, there is a possibility that the stacking position (facing position) of the electrodes may be shifted when winding, stacking, squeezing, or the like. In particular, in the case of adopting a serpentine-shaped electrode, since the strip-like electrodes are alternately folded in a state of being accommodated in the separator bag body, the possibility that the opposing surfaces of the electrodes are displaced is increased.
For example, when the number of laminations is small, the dimension of facing position deviation is small, so it can be absorbed as a structural error range. However, when the number of laminations is large, the size of positional deviation is also large, so electrode misalignment can be ignored. There is a risk of disappearing.

In particular, in the case of forming an electrochemical cell in which the number of laminations is increased in order to increase the capacity of the battery, there is a possibility that the facing positional deviation of each laminated electrode can not be ignored.
For example, in the case of stacking a plurality of serpentine electrodes, the next electrode is folded so as to go around one lower electrode, so the wraparound error during winding, the error of the bent portion at the time of zigzag, the error of lamination positioning, etc. Is accumulated, and the error of the facing position deviation for each electrode becomes large.
Therefore, in the conventional electrochemical cell, there is room for improvement in suppressing the displacement of the laminated position (facing position) of the electrode.

  The present invention has been made in view of the conventional circumstances as described above, and in the case of forming a stacked electrochemical cell using electrodes having a serpentine structure, a structure capable of suppressing the facing positional deviation of each stacked electrode. It is an object of the present invention to provide an electrochemical cell and a method of manufacturing the electrochemical cell.

[1] In order to solve the above problems, an electrochemical cell according to an embodiment of the present invention has a beaded shape having a plurality of positive electrode bodies arranged side by side and an electrode connection portion connecting two adjacent positive electrode bodies. , A plurality of negative electrode bodies arranged side by side, and a beaded negative electrode having a plurality of electrode connection portions connecting two adjacent negative electrode bodies, and arranged between the positive electrode and the negative electrode The reference overlapping portion is configured by overlapping one or two negative electrodes of the bead-like middle part with the one or two positive electrodes of the bead-like middle part via the separator. The beaded positive electrode and the beaded negative electrode are alternately stacked in a zigzag manner on the other side, with the reference overlapping portion as a reference, on the other side. Wherein the a strung like positive electrode beaded-like negative electrode are laminated in zigzag fashion through the separator alternately.

  If the reference overlapping portion in which the middle portions of the beaded positive electrode main body or the negative electrode main body are overlapped is used as a border separately on the one side and the other side of the reference overlapping portion, the facing of the positive electrode main body occurring in the serpentine portion on one side It is possible to adopt a structure in which the positional displacement amount does not affect the positional displacement amount of the facing position of the positive electrode main body generated in the other side of the zigzag portion. By reducing the amount of positional deviation between the one side serpentine portion and the other side serpentine portion, it is possible to reduce the facing positional deviation amount of the positive electrode body as a whole of the laminated structure.

In this point, in the structure in which all the positive electrode bodies to be stacked are connected and sequentially stacked in a zigzag form from the end side, positional deviations are sequentially accumulated and increased from the start end side to the end side of the stacked structure. Therefore, there is a problem that the amount of positional deviation of the facing position of the positive electrode main body becomes large.
By reducing the positional deviation amount of the positive electrode main body generated in the serpentine portion on one side and the serpentine portion on the other side, it is possible to suppress the facing positional deviation of the positive electrode main body in the entire laminated structure. By suppressing the facing positional deviation of the positive electrode main body, the capacity decrease of the electrochemical cell can be prevented.

[2] In the electrochemical cell of the one aspect, in the overlapping portion of the positive electrode and the negative electrode, the outer peripheral contour of the positive electrode main body is disposed inside the outer peripheral contour of the negative electrode main body viewed along the overlapping direction Can be adopted.

  In the laminated structure of the electrochemical cell, it is desirable that the outer peripheral contour of the positive electrode main body be disposed inside the outer peripheral contour of the negative electrode main body. When the amount of protrusion of the outer peripheral contour of the positive electrode main body is large, there is a possibility of deposition of a metal constituting ions to be applied to the electrochemical cell, and a possibility of capacity reduction.

[3] In the electrochemical cell of the one aspect, lengths of the plurality of electrode connection portions in the positive electrode are the same, and lengths of the plurality of electrode connection portions in the negative electrode are the same. The outer peripheral contour of the positive electrode main body viewed along the overlapping direction is misaligned for each overlapping layer, and the outer peripheral contour of the positive electrode main body is inside the outer peripheral contour of the negative electrode main body in the layer having the largest displacement amount. It is possible to adopt the arranged configuration.

  In the structure of the electrochemical cell, it is desirable that the outer peripheral contour of the positive electrode body is disposed inside the outer peripheral contour of the negative electrode body. When the amount of protrusion of the positive electrode main body is large, there is a possibility that the metal constituting the ions applied to the electrochemical cell may be deposited, and the capacity may be reduced. The outer peripheral contour of the positive electrode body is disposed inside the outer peripheral contour of the negative electrode body even in the layer of the largest displacement amount at the overlapping portions on one side and the other side bordering the reference overlapping portion These problems can be avoided.

If the positive and negative electrode bodies are alternately superimposed from the end, if the lengths of the electrode connection portion and the electrode connection portion are the same, the negative electrode is caused by an overlay error or the like according to the increase in the number of layers. The overlapping position of the positive electrode body with respect to the body gradually shifts.
Instead of simply overlapping the positive electrode body and the negative electrode body alternately, a reference overlapping portion is formed by overlapping the negative electrode of the middle part of the beaded connection on the positive electrode of the middle part of the beaded connection A serpentine structure is formed on one side in a serpentine shape, and on the other side in a serpentine shape. This makes it possible to make the number of times of slats on one side and the number of slivers on the other side of the reference overlapping portion smaller than the total number of times of slats, so the individual facing positional deviation amounts on one side and the other side of the reference overlapping portion are small. it can.

[4] In the electrochemical cell of the one aspect described above, the positive electrode body and the positive electrode body on the end side from the start end side of the overlapping in the overlapping of the positive electrode and the negative electrode on one side with respect to the reference overlapping portion. The positional deviation amount of each outer peripheral contour viewed along the overlapping direction of the negative electrode main body is increased, and in the overlapping of the positive electrode and the negative electrode on the other side, the end side from the start end side of the overlapping It is possible to adopt a configuration in which the amount of positional deviation of the outer peripheral contours of the positive electrode body and the negative electrode body as viewed along the overlapping direction is increased.

  In the case of a structure in which the positive and negative electrodes in a beaded connection and the strip-like negative electrode are folded while being folded, when the electrode connection portions have the same length, the displacement amount of the positive electrode body is accumulated each time the number of overlapping increases. Become. Even in this structure, if the positional displacement amount of the positive electrode body is suppressed individually on one side and the other side of the reference overlapping portion, the accumulation of the positional displacement amount of the positive electrode body can be reduced. It is possible to provide an electrochemical cell in which the amount of misalignment of

[5] In the electrochemical cell of the one aspect, a configuration in which the connection electrode terminal is led out to one or both of a serpentine portion to one side and a serpentine portion to the other side with respect to the reference overlapping portion It can be adopted.

  The connection electrode terminal can be derived from one or both of the serpentine portion on one side of the reference overlapping portion and the serpentine portion on the other side. Using these connection electrode terminals, connection with a can or the like that accommodates the electrochemical cell is possible. Moreover, the connection distance from the connection electrode terminal derived | led-out from the negative electrode main body or the connection electrode terminal derived | led-out from the positive electrode main body can be adjusted by adjusting the derivation | leading-out position of a connection electrode terminal. For this reason, reliable connection to the can via the connection electrode terminal is possible on the positive electrode side and the negative electrode side. Moreover, when connecting a connection electrode terminal to a can in a positive electrode side and a negative electrode side, the protrusion amount to the side of these connection electrode terminals can be decreased by selecting a suitable derivation | leading-out position. As a result, it is possible to accommodate the serpentine structure without gaps in the can, and to provide an electrochemical cell with a waste-free structure.

[6] In the electrochemical cell according to one aspect, either or both of the beaded positive electrode main body and the beaded negative electrode main body are connected in a linear, L or U shape. The structure which is a negative electrode or a positive electrode is employable.

  The shapes of the positive and negative electrode main bodies in a beaded shape may be any shape such as a linear shape, an L shape, or a U shape. Regardless of the shape, the target electrochemical cell can be configured by forming a reference overlapping portion by overlapping both in the middle part and forming a serpentine structure on one side and the other side with the reference overlapping portion as a boundary. .

[7] A method of manufacturing an electrochemical cell according to an aspect of the present invention includes: a plurality of positive electrode bodies arranged side by side; and a beaded positive electrode having a beaded electrode connection part connecting electrode members connecting two adjacent positive electrode bodies. The beads are connected to one or two positive electrodes in the middle of the bead-like connection by using a bead-like like anode electrode having a plurality of negative electrode bodies arranged side by side and an electrode connection portion connecting two adjacent negative electrode bodies. One or two negative electrodes in the middle of the loop are stacked via the separator to form a reference overlapping portion, and the beaded positive electrode and the bead are connected on one side with respect to the reference overlapping portion. Of the negative electrodes are alternately stacked via the separator in a zigzag manner, and on the other side, the negative electrode in the form of beads and the negative electrode in the form of beads are alternately disposed on the separator. Characterized by laminating the zigzag shape.

  By adopting a structure in which one side and the other side are separately folded at the border of the reference overlapping portion, it is possible to make a configuration in which the positional deviations occurring in the one side and the other side do not affect each other. . By reducing the amount of positional deviation of the individual zigzag portions on one side and the other side, it is possible to reduce the amount of positional deviation of the positive electrode body as a whole of the laminated structure.

In this respect, when all the positive electrode bodies to be stacked are connected from the beaded end portion side and sequentially stacked, positional deviations are sequentially accumulated and increased from the start end side to the end side of the overlapping structure. Therefore, there is a problem that the displacement amount of the positive electrode main body becomes large.
By setting the positional deviations occurring in the one side of the serpentine portion and the other side of the serpentine side not to affect each other, the positional deviation amount occurring in each of the serpentine portions is reduced to thereby position the entire laminated structure. The amount of deviation can be suppressed.

[8] In the method of manufacturing an electrochemical cell according to the above aspect, the outer periphery of the positive electrode body is located inside the outer peripheral contour of the negative electrode body as viewed along the overlapping direction in the overlapping portion of the positive electrode and the negative electrode. It is preferable to arrange the contours.

  In the structure of the electrochemical cell, it is desirable that the outer peripheral contour of the positive electrode main body be disposed inside the outer peripheral contour of the negative electrode main body, and when the amount of protrusion of the positive electrode main body is large, metals constituting ions to be applied to the electrochemical cell There is a risk of precipitation of In the above-mentioned manufacturing method, there is no fear of deposition of the metal constituting the ions for the electrochemical cell by overlapping so that the outer peripheral contour of the positive electrode main body is inside the outer peripheral contour of the negative electrode main body. Can provide an electrochemical cell.

[9] In the method of manufacturing an electrochemical cell of the one aspect, the reference is made using a positive electrode having the same length of the plurality of electrode connections and a negative electrode having the same length of the plurality of electrode connections. The positional deviation is made such that the outer peripheral contour of the positive electrode main body seen along the overlapping direction is misaligned for each overlapping layer in the overlapping on one side with reference to one side and the other side of the overlapping part In the layer having the largest amount, the outer peripheral contour of the positive electrode body is overlapped so as to be inside the outer peripheral contour of the negative electrode body, and in the overlapping on the other side, the outer peripheral contour of the positive electrode body viewed along the overlapping direction It is preferable to overlap so that the outer peripheral contour of the positive electrode body is inside the outer peripheral contour of the negative electrode body in the layer having the largest amount of positional displacement so that the positional deviation of each of the overlapping layers occurs.

  In the structure of the electrochemical cell, it is desirable that the outer peripheral contour of the positive electrode main body be disposed inside the outer peripheral contour of the negative electrode main body, and when the amount of protrusion of the positive electrode main body is large, metals constituting ions to be applied to the electrochemical cell There is a risk of precipitation of By adopting a structure in which the outer peripheral contour of the positive electrode main body is arranged on the inner side of the outer peripheral contour of the negative electrode main body by adopting a structure in which the outer peripheral side of the positive electrode main body is separately folded on the front side and the back side with the reference overlapping portion as a boundary. It is possible to provide an electrochemical cell that can eliminate fear and does not cause a risk of capacity reduction.

[10] In the method of manufacturing an electrochemical cell of the one aspect, in the superposition of the positive electrode and the negative electrode on one side with respect to the reference superposition part, on the termination side from the start side of the superposition, In the superposition of the positive electrode and the negative electrode on the other side, the start point of the superposition is superimposed so that the positional deviation amount of the respective outer peripheral contours seen along the superposition direction of the positive electrode body and the negative electrode body becomes large. From the side to the end side, it is preferable to overlap so that the positional deviation amounts of the respective outer peripheral contours seen along the overlapping direction of the positive electrode body and the negative electrode body become large.

  If the beaded positive electrode and the beaded negative electrode are stacked while being folded, the lengths of the electrode connection portions are the same, and if the lengths of the electrode connection portions are the same, the number of overlapping increases. The positional displacement amount of the positive electrode main body is accumulated and increased each time. Even with this structure, by adopting a structure in which one side and the other side are separately folded at the border of the reference overlapping portion, the amount of positional deviation can be reduced, and accumulation of the amount of positional deviation of the positive electrode main body As a result, it is possible to provide an electrochemical cell in which the amount of misalignment is suppressed.

[11] In the method of manufacturing an electrochemical cell according to the one aspect, the connection electrode terminal is led out to one or both of a serpentine portion to one side and a serpentine portion to the other side with reference to the reference overlapping portion. Is preferred.

  The connection electrode terminal can be derived from the serpentine portion on one side of the reference overlapping portion and the serpentine portion on the other side. These connection electrode terminals can be used to connect with cans and the like that accommodate the electrochemical cell. Moreover, the connection distance from the connection electrode terminal derived | led-out from the negative electrode main body or the connection electrode terminal derived | led-out from the positive electrode main body can be adjusted by adjusting the derivation | leading-out position of a connection electrode terminal. For this reason, reliable connection to the can via the connection electrode terminal is possible on the positive electrode side and the negative electrode side. Moreover, when connecting a connection electrode terminal to a can in a positive electrode side and a negative electrode side, the protrusion amount to the side of these connection electrode terminals can be decreased by selecting a suitable derivation | leading-out position. As a result, it is possible to accommodate the serpentine structure without gaps in the can, and to provide an electrochemical cell with a waste-free structure.

[12] In the method of manufacturing an electrochemical cell according to the above aspect, either or both of the beaded positive electrode body and the beaded negative electrode body are either linear, L-shaped or U-shaped. It is preferable that it is a connected negative electrode or positive electrode.

  According to this embodiment, if the reference overlapping portion in which the middle portions of the beaded positive electrode main body or the negative electrode main body are overlapped is used as the border separately on the one side and the other side, it occurs in the serpentine portion on one side It is possible to adopt a structure in which the amount of positional deviation of the facing position of the positive electrode main body does not affect the amount of positional deviation of the facing position of the positive electrode main body occurring in the serpentine portion on the other side. By reducing the amount of positional deviation between the one side serpentine portion and the other side serpentine portion, it is possible to provide an electrochemical cell in which the facing positional deviation amount of the positive electrode main body is reduced as the entire laminated structure.

It is a top view of the battery concerning a 1st embodiment. It is sectional drawing which follows the II-II line of FIG. It is a perspective view which shows an example of the laminated body integrated in the battery which concerns on 1st Embodiment. It is a perspective view which shows an example of the positive electrode structure integrated in the same battery. It is an expanded view of the positive electrode structure integrated in the battery concerning a 1st embodiment. It is process drawing which shows an example of the process of manufacturing the positive electrode structure integrated in the battery which concerns on 1st Embodiment. It is explanatory drawing which shows the state which piled up the positive electrode structure and negative electrode structure which are used when comprising the laminated body shown in FIG. 3, and the reference | standard superposition | stacking part was comprised. FIG. 8 is an explanatory view showing a state in which a part of the positive electrode structure and the negative electrode structure are twisted in the state shown in FIG. 7; It is the description which shows an example of the positive electrode structure and the negative electrode structure which are integrated in the battery concerning a 2nd embodiment. It is explanatory drawing which shows the state which comprised the positive electrode structure and negative electrode structure which were shown in FIG. FIG. 11 is an explanatory view showing a state in which a part of the positive electrode structure and the negative electrode structure is zigzag-folded from the state shown in FIG. 10; It is the description which shows an example of the positive electrode structure and negative electrode structure which are integrated in the battery concerning a 3rd embodiment. It is explanatory drawing which shows the state which comprised the positive electrode structure and negative electrode structure which were shown in FIG. FIG. 14 is an explanatory view showing a state in which a part of the positive electrode structure and the negative electrode structure are twisted in the state shown in FIG. 13; It is the description which shows an example of the positive electrode structure and negative electrode structure which are integrated in the battery concerning a 4th embodiment. It is a flowchart which shows an example of the method of manufacturing the battery which concerns on 1st Embodiment.

  Hereinafter, embodiments according to the present invention will be described with reference to the drawings. In the following embodiment, a coin-type lithium ion secondary battery (hereinafter simply referred to as "battery") will be described as an example of the electrochemical cell. In the drawings used for the following description, the scale of each member is appropriately changed in order to make each member have a recognizable size.

First Embodiment
[battery]
As shown in FIG. 1, the battery 1 of the present embodiment is circular in plan view. Referring also to FIG. 2, the battery 1 includes the laminate 2, an electrolyte solution (not shown) impregnated in the laminate 2, and an exterior body 10 that accommodates the laminate 2.

[Laminate]
As shown in FIG. 3, the laminate 2 is a positive electrode structure folded in a direction intersecting with the negative electrode 3 so as to be alternately laminated with the negative electrode 3 folded in a zigzag shape and the negative electrode 3. It has four. The configuration of only the positive electrode structure 4 is schematically shown in FIG.

[Negative electrode]
The negative electrode 3 in the state of being developed from the zigzag shape is in the shape of a band, and has a shape in which the plurality of electrode connection portions 3a and the plurality of overhanging portions (negative electrode main body) 3b are connected in a beaded shape. The main body 3b is zigzag folded so as to overlap the positive electrode main body 5b described later.
In addition, the positive electrode 5 mentioned later is formed in the shape of a chain of beads similarly to the negative electrode 3, and is zigzag-folded.

  As shown in FIG. 2, the negative electrode 3 includes a negative electrode current collector 20 and a negative electrode active material layer 22 formed on both sides of the negative electrode current collector 20. In addition, as described later, the negative electrode current collector 20 has a band shape. As shown in FIG. 3, an extended portion (negative electrode terminal) 21 of the negative electrode current collector 20 is formed at one end of the negative electrode 3. The negative electrode terminal 21 is a portion of the negative electrode current collector 20 which is extended outside the negative electrode main body 3 b in the longitudinal direction of the negative electrode 3.

  For example, the negative electrode current collector 20 is formed of a metal material such as copper, nickel, and stainless steel. The negative electrode active material layer 22 contains a negative electrode active material, a conductive additive, a binder, a thickener, and the like. For example, the negative electrode active material layer 22 is formed of a carbon material such as graphite. For example, as a conductive support agent, carbon blacks, a carbon material, metal fine powder, etc. are mentioned. For example, as the binder, resin materials such as polyvinylidene fluoride (PVDF), styrene butadiene rubber (SBR) and polytetrafluoroethylene (PTFE) can be mentioned. For example, as the thickener, resin materials such as carboxymethylcellulose (CMC) can be mentioned.

[Positive electrode structure]
As shown in FIGS. 3 and 4, the positive electrode structure 4 includes a positive electrode 5 and a separator 6 covering the positive electrode 5. The positive electrode structure 4 is obtained by integrating the positive electrode 5 and the separator 6. The outer shape of the positive electrode structure 4 is substantially the same size as the outer shape of the negative electrode 3.

[Positive electrode]
When the positive electrode 5 is developed, it has a band shape as shown in FIG. More specifically, the positive electrode 5 connects the plurality of electrode connection portions 5a and the plurality of positive electrode bodies 5b in a beaded connection. Hereinafter, the direction orthogonal to the longitudinal direction of the positive electrode 5 is referred to as “the width direction of the positive electrode 5”. The electrode connection portion 5 a is recessed inward in the width direction of the positive electrode 5.
As shown in FIG. 5, in a state in which the positive electrode 5 is developed, the positive electrode main body 5 b is disposed at a position adjacent to the electrode connection portion 5 a in the longitudinal direction of the positive electrode 5. The positive electrode main body 5 b protrudes in an arc shape to the outside of the electrode connection portion 5 a in the width direction of the positive electrode 5. In this embodiment, the positive electrode main body 5b has a disk shape, and 12 pieces of the positive electrode main body 5b are linearly connected via the electrode connection portion 5a.

  As shown in FIG. 4, in the serpentine structure of the positive electrode structure 4, the respective positive electrode bodies 5 b are disposed substantially in parallel with each other. The electrode connection portion 5 a is continuous with the end edge of each positive electrode main body 5 b in the longitudinal direction of the positive electrode 5. That is, the electrode connection part 5a connects in series two adjacent positive electrode main bodies 5b.

  With reference to FIGS. 3 to 5 together, the outer shape of the positive electrode 5 (the outer peripheral contour in plan view along the stacking direction) is the outer shape of the negative electrode 3 in the planar view along the stacking direction Slightly smaller than). That is, the outer shapes of the electrode connection portion 5 a and the positive electrode main body 5 b in the positive electrode 5 are slightly smaller than the outer shapes of the electrode connection portion 3 a and the negative electrode main body 3 b in the negative electrode 3.

  As shown in FIG. 2, the positive electrode 5 includes a strip-shaped positive electrode current collector 30 and a positive electrode active material layer 32 formed on both sides of the positive electrode current collector 30. As shown in FIG. 4 or FIG. 5, an extended portion (positive electrode terminal) 31 of the positive electrode current collector 30 is formed at one end of the positive electrode 5. The positive electrode terminal 31 is a portion of the positive electrode current collector 30 which extends outside the positive electrode main body 5 b in the longitudinal direction of the positive electrode 5.

  For example, the positive electrode current collector 30 is formed of a metal material such as aluminum and stainless steel. The positive electrode active material layer 32 contains a positive electrode active material, a conductive support agent, a binder, a thickener, and the like. For example, the positive electrode active material layer 32 is formed of a composite metal oxide such as lithium cobaltate or lithium nickelate. For example, as a conductive support agent, carbon blacks, a carbon material, metal fine powder, etc. are mentioned. For example, as the binder, resin materials such as polyvinylidene fluoride (PVDF), styrene butadiene rubber (SBR) and polytetrafluoroethylene (PTFE) can be mentioned. For example, as the thickener, resin materials such as carboxymethylcellulose (CMC) can be mentioned.

[Separator]
As shown in FIG. 5, the separator 6 is in the form of a band in the unfolded state. Similar to the positive electrode 5 described above, the separator 6 includes a plurality of electrode connection portions 6 a and six projecting portions 6 b. The outer shapes of the electrode connection portion 6 a and the overhang portion 6 b in the separator 6 are substantially the same size as the electrode connection portion 3 a and the negative electrode main body 3 b in the negative electrode 3.

  The separator 6 is a thin film of a pore structure having lithium ion conductivity. For example, the separator 6 is formed of a polyolefin such as polypropylene (PP) and polyethylene (PE) and a resin material such as polytetrafluoroethylene (PTFE). The separator 6 is formed by integrating a pair of the first separator 41 and the second separator 42 shown in FIG. 6 by heat fusion. In FIG. 5, the first separator 41 and the second separator 42 in a state in which the pair of first separators 41 and the second separator 42 are cut out to have substantially the same size as the outer shape of the negative electrode 3 are shown. .

[Laminate]
In the laminate 2 of the present embodiment, the positive electrode structure 4 provided with the separator 6 having the configuration shown in FIG. 5 and the negative electrode 3 having a similar external shape to the outer shape in plan view of the separator 6 are alternately folded to be alternately stacked. It is configured by doing.
When the laminate 2 is viewed in plan along the stacking direction as shown in FIG. 3, the circular outer peripheral contour of the positive electrode main body 5 b is disposed inside the circular outer peripheral contour of the overhang portion 6 b of the separator 6.

  The laminate 2 of the present embodiment is configured by being folded so as to alternately overlap the negative electrode 3 and the positive electrode structure 4 except for a part thereof. When the laminate 2 is viewed in plan along the stacking direction as shown in FIG. 3, the circular outer peripheral contour of the positive electrode main body 5 b is disposed inside the circular outer peripheral contour of the negative electrode main body 3 b of the negative electrode 3 . This arrangement relationship is equivalent in all the positive electrode bodies 5 b of the laminate 2.

FIG. 7 shows an example of a state in which a zigzag structure including the negative electrode 3 and the positive electrode structure 4 is developed in the laminate 2 of the present embodiment. In other words, FIG. 7 shows a state before the negative electrode 3 and the positive electrode structure 4 are formed into a zigzag structure.
In this example, as shown in FIG. 7, the strip-shaped positive electrode structure 4 is horizontally disposed with the positive electrode terminal 31 on the left side, and the inverted U-shaped negative electrode 3 is superimposed on the positive electrode structure 4. The positive electrode terminal 31 shown in FIG. 7 is drawn exaggeratingly longer than the positive electrode terminal 31 shown in FIG.

In this example, twelve positive electrode bodies 5b are connected in a row in a row, and a positive electrode terminal 31 is formed on the left end side of the positive electrode structure 4. Further, the negative electrode 3 is provided with two rows of six bead-like negative electrode main bodies 3b connected in an inverted U-shape. The negative electrode body 3b at one end of the first row of the negative electrode 3 is connected to the negative electrode body 3b at one end of the second row, and the negative electrode 3 is formed in an inverted U shape, and the other end of the first row The negative electrode terminal 21 is formed on the negative electrode body 3b on the side. The negative electrode terminal 21 shown in FIG. 7 is drawn exaggeratingly longer than the negative electrode terminal 21 shown in FIG.
Further, although the outer shape of the overhanging portion 6b of the separator 6 provided in the positive electrode structure 4 and the outer shape of the negative electrode main body 3b formed in the negative electrode 3 are essentially the same shape in FIG. In order to facilitate the drawing, the outer shape of the overhang portion 6b is drawn slightly smaller than the outer shape of the negative electrode main body 3b.

  As shown in FIG. 7, on the sixth positive electrode main body 5b from the left end side (the side on which the positive electrode terminal 31 is formed) (more precisely, on the extension 6b of the separator 6) The negative electrode main body 3b is overlapped, and the negative electrode main body 3b at one end side of the second row is overlapped on the seventh positive electrode main body 5b (more precisely, on the overhang portion 6b of the separator 6). In other words, the two negative electrode main bodies 3b at one end side of the inverted U-shaped negative electrode 3 are overlapped in a T shape on both sides of the central portion (intermediate portion) of the positive electrode structure 4 in a row. The overlapped portion is a reference overlapping portion a.

  In the state shown in FIG. 7, the six positive electrode bodies 5b on the right side of the reference overlapping portion a and the six negative electrode bodies 3b on the right row side (second row) are arranged in an inverted L shape. For this reason, from the state shown in FIG. 7, the six positive electrode bodies 5 b on the right side and the six negative electrode bodies 3 b on the right row side can be zigzag folded by alternately folding the positive electrode body 5 b and the negative electrode body 3 b. The positive electrode main body 5b and the negative electrode main body 3b can be alternately alternately folded in the order shown in (1), (2) and (3) in FIG. 7, and FIG. 8 shows a state where these are folded halfway for reference .

Next, in the state shown in FIG. 7, the six positive electrode bodies 5b on the left side of the reference overlapping portion a and the six negative electrode bodies 3b on the left row side (first row) are arranged in an inverted L shape. In the state shown in FIG. 7, the six positive electrode bodies 5b on the left side and the six negative electrode bodies 3b on the left row side can be alternately folded by alternately winding the positive electrode body 5b and the negative electrode body 3b.
When the right-hand side and the left-side meandering are completed, the laminate 2 shown in FIGS. 2 and 3 is obtained by folding the positive electrode main bodies 5b of the reference overlapping portion a.

In addition, the laminated body 2 shown in FIG. 3 and the zigzag-shaped positive electrode structure 4 shown in FIG. 4 are drawn as a model of a structure that is ideally zigzag-folded. However, when actually manufacturing a serpentine structure at a production site, if the lengths of the electrode connection portions 3a and 5a are uniform, the thickness of the positive electrode main body 5b and the negative electrode main body 3b arranged in the layer immediately below In addition, the overall thickness of the laminated electrode gradually increases. For this reason, there is a problem that it is not easy to align the centers of the positive electrode bodies 5b of all the positive electrodes 5 with the centers of the negative electrode bodies 3b of all the negative electrodes 3.
For this reason, although omitted in FIG. 2 to FIG. 4, in the laminate 2, the positive electrode main body 5 b is strictly misaligned for each of the layers folded and folded.

However, in the laminate 2 of the present embodiment, the negative electrode main body 3b is formed even when the circular outer peripheral contours of all the positive electrode main bodies 5b have some positional deviation when viewed in plan along the overlapping direction. Are arranged inside the outer peripheral contour of the circular shape. Further, in the laminated body 2, the negative electrode main body 3 b of the negative electrode 3 is even when the circular outer peripheral contours of all the positive electrode main bodies 5 b have some positional deviation in plan view along the overlapping direction. Are arranged inside the outer peripheral contour of the circular shape.
As described above, the positional deviation can be reduced in the laminate 2 because a structure is adopted in which one side and the other side of the reference overlapping portion a are individually folded in a zigzag manner. The reason will be described in detail later.

[Exterior body]
With reference to FIG. 1 and FIG. 2 together, the exterior body 10 includes a positive electrode can 11, a negative electrode can 12, and a gasket 13 for electrically insulating between the positive electrode can 11 and the negative electrode can 12. ing.
The positive electrode can 11 and the negative electrode can 12 have a flat, bottomed cylindrical shape. The inner diameter of the positive electrode can 11 is slightly larger than the outer diameter of the negative electrode can 12. The laminate 2 is sandwiched between the bottom surface of the negative electrode can 12 and the bottom surface of the positive electrode can 11 with the cylindrical portion of the negative electrode can 12 inserted in the positive electrode can 11.

  The gasket 13 is disposed between the outer peripheral surface of the cylindrical portion of the negative electrode can 12 and the inner peripheral surface of the cylindrical portion of the positive electrode can 11. The laminated body 2 is sealed to the exterior body 10 by the gasket 13. With reference to FIG. 2 and FIG. 3 together, the positive electrode can 11 is connected to the extension 31 of the positive electrode current collector 30, and functions as a positive electrode. On the other hand, the negative electrode can 12 is connected to the extending portion 21 of the negative electrode current collector 20 and functions as a negative electrode terminal. In FIG. 2, illustration of the electrode terminals 21 and 31 connected to the positive electrode can 11 and the negative electrode can 12 is omitted.

In the battery 1 of the present embodiment, a structure in which one side and the other side, in other words, the front side and the back side, of the laminated body 2 are individually folded via the reference overlapping portion a is adopted.
The following features are obtained by forming a structure in which the stack 2 is individually folded on the front side and the back side via the reference overlapping portion a.

  In the case of a structure having a large number of laminations in the laminate, assuming that the electrode connection portions 3a and 5a have the same length, the center position of the positive electrode body 5b is positioned little by little with respect to the center position of the negative electrode body 3b each time lamination is performed There is a gap. This is due to the fact that the stack gradually becomes thicker due to stacking of the negative electrode main body 3b and the positive electrode main body 5b stacked in the case of the zigzag folding, the influence of the bending accuracy in the case of the spiral folding, the influence of the positional deviation of the positive electrode main body 5b, etc. Consist of multiple factors.

When the battery 1 is configured, the external shapes of the positive electrode main body 5b and the negative electrode main body 3b are formed as large as possible in order to secure the capacity, and the lengths of the electrode connection portions 3a and 5a are formed as short as possible. It is also influenced by the fact that the amount of extension of the portions 3a and 5a to the outside is made as small as possible, and the facing positional deviation becomes large.
In FIGS. 2 to 4, the bent portions of the electrode connection portions 3 a and 5 a are drawn in a shape having a margin, but in an actual configuration, the bent portions of the electrode connection portions 3 a and 5 a are stretched according to these figures It is a bent portion with a small amount of protrusion and a small radius of curvature.

  Therefore, although the amount of misalignment is small when the number of laminations of the positive electrode main body 5b and the negative electrode main body 3b is as small as about 6 to 8 layers, the amount of positional deviation is small. Depending on the number of stacked layers, the outer peripheral contour of the positive electrode main body 5b may protrude from the outer peripheral contour of the negative electrode main body 3b. In the case where the outer peripheral contour of the positive electrode main body 5b protrudes from the outer peripheral contour of the negative electrode main body 3b in plan view, metal lithium deposition may occur in the lithium ion battery if the amount of the protruding is large.

  In this point, if a structure is adopted in which the front and back sides are individually folded by means of the reference overlapping portion a provided in the middle of the beading, accumulation of positional deviation amount is made as compared to the case where the beading is sequentially zigzagged from the end. It can be reduced. Therefore, by adopting the structure of the present embodiment, it is possible to provide the battery 1 with little displacement of the facing position of the positive electrode main body 5b.

  That is, in the structure of the present embodiment, the positional deviation amount of the facing position of the positive electrode main body 5b generated on the front side with the reference overlapping portion a as the positional deviation amount of the facing position of the positive electrode main body 5b generated on the rear side The structure is not affected. Therefore, by reducing the facing positional deviation of the individual positive electrode bodies 5b generated on the front and back sides of the reference overlapping portion a, the opposing positional deviation of the positive electrode body 5b as the whole battery 1 is reduced. it can.

  In addition, in the case of a structure in which the end portions of the positive electrode body and the negative electrode body in a beaded connection are sequentially zigzag-folded, positional deviations are sequentially accumulated and increased from the start end side to the end side of the overlapping structure. Therefore, there is a problem that the amount of positional deviation of the facing position of the positive electrode main body becomes large. In the present embodiment, this problem can be solved.

  By the way, in the structure of the first embodiment, the present invention is applied to an electrochemical cell of 24 layer structure provided with 12 positive electrode main bodies 5b and 12 negative electrode main bodies 3b only, but the present invention is applied The number of stacked layers of the electrode body is not particularly limited, and any number of layers can be applied.

Second Embodiment
FIGS. 9-11 shows the negative electrode 53 and the positive electrode structure 54 for comprising the laminated body applied to the battery of 2nd Embodiment.
Both the negative electrode 53 and the positive electrode structure 54 of the second embodiment are formed in an L-shape in plan view in a developed state. The point of forming the negative electrode 53 by forming the electrode connection portion 53a and the negative electrode main body 53b in the shape of a series connection is the same as the structure of the negative electrode 3 of the first embodiment. In addition, the negative electrode 53 has the same structure as that of the negative electrode 3 in the structure including the current collector layer and the active material layer. The negative electrode 3 of the first embodiment and the negative electrode 53 of the second embodiment are different only in the plan view structure.

  The positive electrode structure 54 has the same structure as that of the positive electrode structure 4 of the first embodiment in that the electrode connection portion 55 a and the positive electrode main body 55 b are formed in a beaded shape. In addition, regarding the structure provided with the current collector layer and the positive electrode active material layer, the positive electrode structure 54 has the same structure as the positive electrode structure 4 of the first embodiment. Further, the structure in which the electrode connection portion 55a and the positive electrode main body 55b are covered with the separator 56 is also similar to the structure of the first embodiment. That is, the electrode connecting portion 55a is covered with the electrode connecting portion 56a of the separator 56, and the positive electrode main body 55b is covered with the protruding portion 56b of the separator 56. The outer shape of the protruding portion 56b is the same as that of the negative electrode main body 53b of the negative electrode 53. It is the same that it is the same shape as the outer shape. The positive electrode structure 4 of the first embodiment and the positive electrode structure 54 of the second embodiment are different only in the plan view shape.

  In the example shown in FIG. 9, as in the case of FIG. 7 showing the first embodiment, the outer shape of the overhang portion 56b of the separator 56 provided in the positive electrode structure 54 and the negative electrode main body 53b formed in the negative electrode 53. The outer shape is essentially the same shape, but in FIG. 9, the outer shape of the overhanging portion 56b is drawn slightly smaller than the outer shape of the negative electrode main body 53b in order to make it easy to distinguish both electrodes.

In the structure of the second embodiment, as shown in FIG. 10, the positive electrode main body 55b located at the corner of the positive electrode structure 54 on the negative electrode body 53b located at the corner of the L-shaped negative electrode structure 53 (precisely The overlapping portion 56b) is overlapped, and the whole is arranged in a cross shape. In the superimposed state shown in FIG. 10, the superimposed portion of the negative electrode main body 53b and the positive electrode main body 55b (more precisely, the overhang portion 56b) is the reference superimposed portion b.
As shown in FIG. 10, when the reference overlapping portion b is formed, the six positive electrode main bodies 55b (to be precise, the projecting portions 56b) located on the right side of the reference overlapping portion b and the upper side of the reference overlapping portion b. As shown in (1) to (4) of FIG. 10, using the five overhanging portions 56b located, the sheet is folded in order.

That is, as shown in (1) of FIG. 10, the positive electrode main body 55b (to be precise, the overhang portion 56b) is folded back to the back side of the negative electrode body 53b, and the back side is folded back as shown in (2). 3) As shown in (4) and (4), the operation of sequentially folding back the positive electrode main body 55b (to be precise, the overhang portion 56b) and the negative electrode main body 53b is alternately repeated.
By this serpentine folding, it is possible to alternately fold the six positive electrode main bodies 55b located on the right side of the reference overlapping portion b and the five projecting portions 56b located on the upper side of the reference overlapping portion b.
In FIG. 11, for reference, a state in which the two positive electrode main bodies 55 b located on the right side of the reference overlapping portion b and the two overhanging portions 56 b located on the upper side of the reference overlapping portion b are folded and overlapped Is shown.

After the above-described zigzag folding is completed, the six negative electrode bodies 53b located on the left side of the reference overlapping portion b shown in FIG. 10 and the five positive electrode bodies 55b located below the reference overlapping portion b (to be precise) If the overhanging portions 56b) are alternately folded on the front side of the paper surface of FIG. 10, the remaining negative electrode body 53b and positive electrode body 55b can be completed to be folded.
In the zigzag structure described based on FIG. 10, the negative electrode main body 53b and the positive electrode main body 55b are zigzag-folded on the front surface side (one side) and the back surface side (other side) of the reference overlapping portion b.

In the present embodiment, the laminated body as a whole has a 24-layer structure including the positive electrode main body 55b and the negative electrode main body 53b. However, when the front side (one side) and the back side (other side) of the reference overlapping portion b are individually viewed, folding of the six positive electrode main bodies 55b via the electrode connection portion 55a and the electrode connection portion 53a The six negative electrode main bodies 55b are folded in a serpentine structure.
For this reason, since accumulation of positional deviation due to folding of the six positive electrode bodies 55b is sufficient, positional deviation of the positive electrode body 55b becomes small as in the structure of the first embodiment. This situation is the same on the front side (one side) and the back side (other side) of the reference overlapping portion b.
Therefore, also in the structure of the second embodiment, the same function and effect as the structure of the first embodiment can be obtained. That is, the amount of displacement of the positive electrode main body 55b can be suppressed.

  In the battery structure of the first embodiment, since the reference overlapping portions a and a are overlapped with each other, a partially overlapped structure of the same electrodes is formed. Although it was disadvantageous in terms of surface, in the structure of the second embodiment, since the positive electrode main body 55b and the negative electrode main body 53b can be completely laminated alternately, the structure of the battery is more preferable.

Third Embodiment
FIGS. 12-14 shows the negative electrode 63 and the positive electrode structure 64 for comprising the laminated body applied to the battery of 3rd Embodiment.
The negative electrode 63 and the positive electrode structure 64 of the third embodiment are both formed in a band shape and in a beaded shape in a developed state. The point of forming the negative electrode 63 by forming the electrode connection portion 63a and the negative electrode main body 63b in a beaded manner is the same as the structure of the negative electrode 3 of the first embodiment. In addition, the negative electrode 63 has the same structure as that of the negative electrode 3 in the structure including the current collector layer and the active material layer.

  The positive electrode structure 64 has the same structure as that of the positive electrode structure 4 of the first embodiment in that the electrode connection portion 65 a and the positive electrode main body 65 b are formed in a beaded shape. In addition, regarding the structure provided with the current collector layer and the positive electrode active material layer, the positive electrode structure 64 has the same structure as the positive electrode structure 4 of the first embodiment. The structure in which the electrode connection portion 65a and the positive electrode main body 65b are covered with the separator 66 is also the same as the structure of the first embodiment. That is, the structure is the same as in the structure in which the electrode connection portion 65a is covered with the electrode connection portion 66a of the separator 66 and the positive electrode main body 65b is covered with the overhang portion 66b of the separator 66. The external shape of the overhang portion 66b is the same as the external shape of the negative electrode main body 63b. It is equivalent as well.

  In the example shown in FIG. 12, as in the case of FIG. 7 showing the first embodiment, the outer shape of the overhanging portion 66b of the separator 66 provided in the positive electrode structure 64 and the negative electrode main body 63b formed in the negative electrode 63. The outer shape is essentially the same shape, but in FIG. 12, the outer shape of the overhanging portion 66b is drawn slightly smaller than the outer shape of the negative electrode main body 63b in order to make it easy to distinguish both electrodes.

  In the structure of the third embodiment, as shown in FIG. 13, the anode body 63 b is positioned on the seventh position from the left side along the length direction of the anode structure 63 along the length direction of the cathode structure 64. The positive electrode main body 65b (exactly the overhanging portion 66b) at the sixth position from the second to the third position is placed in a cross shape as a whole. In the superimposed state shown in FIG. 13, the superimposed portion of the negative electrode main body 63b and the positive electrode main body 65b (to be precise, the overhang portion 66b) is a reference superimposed portion c.

As shown in FIG. 10, when the reference overlapping portion c is formed, the five positive electrode main bodies 65b (to be precise, the projecting portions 66b) located on the right side of the reference overlapping portion c and the upper side of the reference overlapping portion c. As shown in (1) to (4) of FIG.
That is, as shown in (1) of FIG. 13, the positive electrode main body 65b (exactly the projecting portion 66b) is folded back to the back side of the negative electrode body 63b, and the back side is folded back as shown in (2). 3) As shown in (4) and (4), the operation of sequentially folding back the positive electrode main body 65b (exactly the overhang portion 66b) and the negative electrode main body 63b is alternately repeated.

By this serpentine folding, it is possible to alternately fold the five positive electrode main bodies 65b located on the right side of the reference overlapping portion c and the five projecting portions 63b located on the upper side of the reference overlapping portion b.
In FIG. 14, for reference, a state in which the two positive electrode main bodies 65 b located on the right side of the reference overlapping portion c and the two overhang portions 66 b located on the upper side of the reference overlapping portion c are folded and overlapped Is shown.

After the above-described zigzag folding is completed, the six positive electrode main bodies 65b (specifically, the overhanging portions 66b) positioned on the left side of the reference overlapping portion c shown in FIG. 14 and the six positioned below the reference overlapping portion c. If the negative electrode body 63b is alternately folded on the front side of the paper surface of FIG. 14, the remaining negative electrode body 63b and positive electrode body 65b can be completed to be folded.
In the serpentine structure described based on FIG. 14, the negative electrode main body 63 b and the positive electrode main body 65 b are zigzag-folded on the surface side (one side) and the back side (other side) of the reference overlapping portion c.

In the present embodiment, the laminated body as a whole has a 24-layer structure including the positive electrode body 65 b and the negative electrode body 63 b. However, when the front side (one side) and the back side (other side) of the reference overlapping portion c are individually viewed, folding of the six positive electrode main bodies 65b via the electrode connection portion 65a and the electrode connection portion 63a It is set as the serpentine structure by the folding on of the six negative electrode main bodies 65b which intervened.
For this reason, since accumulation of positional deviation due to folding of the six positive electrode main bodies 65b is sufficient, positional deviation of the positive electrode main body 65b becomes small as in the structure of the first embodiment. This situation is the same on the front side (one side) and the back side (other side) of the reference overlapping portion b.
Therefore, also in the structure of the third embodiment, the same function and effect as the structure of the first embodiment can be obtained. That is, the amount of displacement of the positive electrode main body 65b can be suppressed.

  In the battery structure of the first embodiment, since the reference overlapping portions a and a are overlapped with each other, a partially overlapped structure of the same electrodes is formed. Although it was disadvantageous in terms of surface, in the structure of the third embodiment, since the positive electrode main body 65b and the negative electrode main body 63b can be completely laminated alternately, the structure of the battery is more preferable.

Fourth Embodiment
FIG. 15 shows a negative electrode 73 and a positive electrode structure 4 for constituting a laminate applied to the battery of the fourth embodiment.
The negative electrode 73 and the positive electrode structure 4 of the fourth embodiment are both formed in a band shape and in a beaded shape in a developed state. The point of forming the negative electrode 73 by forming the electrode connection portion 73a and the negative electrode main body 73b in a beaded manner is the same as the structure of the negative electrode 3 of the first embodiment. In addition, the negative electrode 73 is equivalent to the structure of the negative electrode 3 also in the structure provided with the current collector layer and the active material layer.

In this example, as shown in FIG. 15, the strip-like positive electrode structure 4 is horizontally disposed with the positive electrode terminal 31 on the left side, and an inverted U-shaped negative electrode 73 is superimposed on the positive electrode structure 4.
In this example, twelve positive electrode bodies 5b are connected in a row in a row, and a positive electrode terminal 31 is formed on the left end side of the positive electrode structure 4. Further, in the negative electrode 73, two rows of six negative electrode main bodies 73b in a row are provided and connected in an inverted U shape. The negative electrode main body 73b at one end side of the first row of the negative electrode 73 is connected to the negative electrode main body 73b at one end side of the second row, and the negative electrode 73 is formed in an inverted U shape. The negative electrode terminal 21 is formed on the negative electrode main body 73b.
Further, although the outer shape of the overhanging portion 6b of the separator 6 provided in the positive electrode structure 4 and the outer shape of the negative electrode main body 73b formed in the negative electrode 73 are essentially the same shape in FIG. In order to facilitate the drawing, the outer shape of the overhang portion 6b is drawn slightly smaller than the outer shape of the negative electrode main body 73b.

  As shown in FIG. 15, on the sixth positive electrode main body 5b from the left end side (the side on which the positive electrode terminal 31 is formed) (more precisely, on the extension 6b of the separator 6) The negative electrode main body 73b is overlapped, and the negative electrode main body 73b at one end side of the second row is overlapped on the seventh positive electrode main body 5b (more precisely, on the overhang portion 6b of the separator 6). In other words, the two negative electrode bodies 73b at one end of the inverted U-shaped negative electrode 73 are overlapped in a T-shape at the central portion (halfway) of the single row bead-like connected positive electrode structure 4. The overlapping portion is taken as a reference overlapping portion d.

  When the reference overlapping portion d is configured, the positive electrode main body 5b on the side on which the positive electrode terminal 31 is formed (to be precise, the overhanging portion 6b of the separator 6) and the negative electrode main body 73b in the first row where the negative electrode terminal 21 is formed. Spell fold sequentially. Further, when these serpentine folding is completed, the entire serpentine folded structure can be realized by sequentially serpently folding the remaining positive electrode main body 5b (precisely, the overhang portion 6b of the separator 6) and the negative electrode main body 73b in the second row.

  In the configuration of the fourth embodiment, the whole of the laminate has a 24-layer structure including the positive electrode body 5b and the negative electrode body 73b. However, when the front side (one side) and the back side (other side) of the reference overlapping portion d are individually viewed, folding of the six positive electrode main bodies 5b via the electrode connection portion 5a and the electrode connection portion 73a It has a serpentine structure by folding the six negative electrode main bodies 5b with each other.

For this reason, since accumulation of positional deviation due to folding of the six positive electrode main bodies 5b is sufficient, positional deviation of the positive electrode main body 5b becomes small as in the structure of the first embodiment. This situation is the same on the front side (one side) and the back side (other side) of the reference overlapping portion d.
Therefore, also in the structure of the fourth embodiment, the same function and effect as the structure of the first embodiment can be obtained. That is, the displacement amount of the positive electrode main body 5b can be suppressed.

As described above, the shape of the beaded connection structure of the positive electrode main body and the shape of the beaded connection structure of the negative electrode main body may be any shape as long as they can be zigzag folded.
The electrode structure in which both the negative electrode main body 3b and the positive electrode main body 5b described above are disposed linearly or in a U-shape or an L-shape via the electrode connection portions 3a and 5a has been described. However, the negative electrode 3 and the positive electrode 5 do not have to be limited to these shapes, and even if they are connected in a shape such as a bent shape or a curved shape, they may be folded in a serpentine shape. Or the shape of the negative electrode does not matter.

Further, in the embodiments described so far, the structure in which the lengths of the electrode connection portions 3a and 5a are all the same has been described. However, the lengths of the electrode connection portions 3a and 5a do not have to be constant and may be different. For example, in the case of a serpentine structure, a configuration may be adopted in which the length of the electrode connection portions 3a and 5a is longer on the end side than on the start side of the folding. In addition, in the case of the serpentine structure, a configuration may be adopted in which the lengths of the electrode connection portions 3a and 5a gradually become longer on the end side than on the start side of the folding.
By adopting these structures, it becomes possible to arrange the positive electrode main body 5b always at the same position even if the thickness of the laminate increases according to the number of laminations. For this reason, even in the case of manufacturing a large amount of batteries 1 at the time of mass production or the like, the above-described structure may be adopted if the lengths of the electrode connection portions 3a and 5a can be managed.

Furthermore, in the said embodiment, although the laminated body 2 was enclosed in the exterior body 10 and the example made into coin shape was mentioned and demonstrated, this invention is not limited to this structure, The laminated body 2 is made from a laminate film A structure in which the lead wires electrically connected to the laminate 2 are made to protrude from the laminate pack may be adopted.
In the case of a laminate pack made of a laminate film, since it is superior in sealing property to a can body structure comprising the positive electrode can 11 and the negative electrode can 12 and the gasket 13, it has a feature of excellent long-term reliability as a battery.

[Method of manufacturing battery]
Next, an example of a method of manufacturing the above-described battery 1 will be described.
As shown in FIG. 16, in the method of manufacturing the battery 1, an electrode processing step S 1 for processing the positive electrode 5 into a predetermined shape, an electrode covering step S 2 for covering the positive electrode 5 with the separator 6, and the coated positive electrode 5 are separately An electrode combination step S3 in combination with the negative electrode 3 processed into a predetermined shape, a zigzag step S4 in which the positive electrode structure 4 and the negative electrode 3 are alternately stacked in a state with the separator 6 interposed therebetween, and an electrode terminal connection step Includes S5.

  First (that is, before the electrode processing step S1), a coating liquid (slurry) containing a constituent material for forming the positive electrode active material layer 32 and the negative electrode active material layer 22 is prepared. Hereinafter, a coating solution containing a constituent material for forming the positive electrode active material layer 32 is referred to as “slurry for positive electrode”, and a coating solution containing a constituent material for forming the negative electrode active material layer 22 is referred to as “slurry for negative electrode”. The slurry for positive electrode contains the above-mentioned positive electrode active material, a conductive support agent, a binder, a thickener and the like. The slurry for the negative electrode contains the above-mentioned negative electrode active material, a conductive additive, a binder, a thickener and the like. In addition, as a solvent of the slurry, any material may be used as long as it dissolves the binder and the thickener and disperses the active material and the conductive additive.

Next, the positive electrode current collector 30 and the negative electrode current collector 20 are prepared.
Then, the positive electrode slurry is applied to both sides of the positive electrode current collector 30. Thereafter, the positive electrode slurry is dried. Thereby, the positive electrode active material layer 32 is formed on both surfaces of the positive electrode current collector 30 to obtain a positive electrode sheet. Then, the positive electrode sheet is cut into the above-described strip shape with a slitter or the like to obtain the positive electrode 5 (electrode processing step S1).

On the other hand, the negative electrode slurry is applied to both surfaces of the negative electrode current collector 20. Thereafter, the negative electrode slurry is dried. Thereby, the negative electrode active material layer 22 is formed on both surfaces of the negative electrode current collector 20 to obtain a negative electrode sheet. Then, the negative electrode sheet is cut into the above-described strip shape with a slitter or the like to obtain the negative electrode 3.
In the electrode processing step S1 (that is, before the electrode covering step S2), the outer shape of the positive electrode 5 is made smaller than the outer shape of the negative electrode 3.

  Next, as shown in FIG. 6, the positive electrode 5 is sandwiched and covered by the first separator 41 and the second separator 42 constituting the separator 6, and these are heat-welded and integrated (electrode coating step S2) . The first separator 41 and the second separator 42 have a rectangular shape extending in the longitudinal direction of the positive electrode 5 in the unfolded state (the plan view in FIG. 6). The outer shape of the first separator 41 and the second separator 42 may have a size that covers the electrode connection portion 5 a and the positive electrode main body 5 b of the positive electrode 5 and exposes the extending portion 31. The positive electrode 5 is integrated with the separator 6 by heat fusion to form a positive electrode structure 4.

  The first separator 41 and the second separator 42 and the positive electrode 5 are thermally fused to obtain a positive electrode structure sheet. Then, the positive electrode structure sheet is cut into the above-described strip shape with a slitter or the like to obtain the positive electrode structure 4 shown in FIG. At this time, in the unfolded state, the outer shape of the positive electrode structure 4 is made to have substantially the same size as the outer shape of the negative electrode 3.

  Next, the positive electrode structure 4 and the negative electrode 3 are combined so as to overlap at the reference overlapping portion a as shown in FIG. 7 (electrode combining step: S3), and then the right side The laminate 2 is obtained by folding each of the first and the left sides (the other side) into a serpentine shape and finally folding back the reference overlapping portion a (striking step: S4).

Since the negative electrode terminal 21 and the positive electrode terminal 31 protrude to the side of the laminate 2, the laminate 2 impregnated with the electrolyte solution is impregnated into the outer package 10 after the laminate 2 is impregnated with the electrolyte solution (not shown). , The negative electrode terminal 21 is electrically connected to the negative electrode can 12 side, and the positive electrode terminal 31 is electrically connected to the positive electrode can 11 side (electrode terminal connecting step: S5).
Next, the laminate 2 is sealed in the outer package 10 to complete the battery 1.

  If it is the battery 1 manufactured in this way, the battery 1 which exhibits the above-mentioned outstanding effect can be obtained by the serpentine structure on one side and the other side via the reference | standard superposition | stacking part a.

  a, b, c, d: reference overlapping portion, 1: battery, 2: laminate, 3: negative electrode, 3a: electrode connection portion, 3b: negative electrode main body (projected portion), 4: positive electrode structure, 5: Positive electrode, 5a: electrode connection portion, 5b: positive electrode main body (projected portion), 6: separator, 6a: electrode connection portion, 6b: overhang portion, 10: exterior body, 11: positive electrode can, 12: negative electrode can, DESCRIPTION OF SYMBOLS 13 ... Gasket, 20 ... Negative electrode collector, 21 ... Negative electrode terminal (extension part) 22, 22 ... Negative electrode active material layer, 30 ... Positive electrode collector, 31 ... Positive electrode terminal (extension), 32 ... Positive electrode Active material layer, 41: first separator, 42: second separator, 53, 63: negative electrode, 53a, 63a: electrode connection portion, 53b, 63b: negative electrode body, 54, 64: positive electrode structure, 54a, 64a, ... Electrode connection portion, 54b, 64b: positive electrode main body, 73: negative electrode, 73a: electricity Connecting portion, 74b ... anode body, S1 ... electrode processing step, S2 ... electrode coating step, S3 ... electrode combination step, S4 ... zigzag step, S5 ... electrode terminal connecting step.

[1] In order to solve the above problems, an electrochemical cell according to an embodiment of the present invention has a beaded shape having a plurality of positive electrode bodies arranged side by side and an electrode connection portion connecting two adjacent positive electrode bodies. , A plurality of negative electrode bodies arranged side by side, and a beaded negative electrode having a plurality of electrode connection portions connecting two adjacent negative electrode bodies, and arranged between the positive electrode and the negative electrode A negative electrode or a positive electrode comprising a separator in which the beaded positive electrode main body and the beaded negative electrode main body are connected in either an L shape or a U shape. A reference overlapping portion is formed by superimposing one or two negative electrodes of the bead-like middle part on one or two of the positive electrodes of the bead-like middle part via the separator. The beaded positive electrode and the beaded negative electrode are alternately stacked in a zigzag manner on one side with the reference overlapping portion as a reference, and the beaded positive electrode and the beaded bead on the other side. The present invention is characterized in that the negative electrodes of the above are alternately stacked in a zigzag manner via the separator.

[2] In the electrochemical cell according to one aspect, a beaded connection including a protruding portion covering the front and back surface and the peripheral surface of the positive electrode body of the positive electrode, and a connection portion covering the front and back surface and the peripheral surface of the electrode connection portion The positive electrode is covered with the separator, and the outer peripheral contour of the extension of the separator and the outer peripheral contour of the negative electrode main body of the negative electrode are aligned in the serpentine state, and the overlapping portion of the positive electrode and the negative electrode A configuration can be employed in which the outer peripheral contour of the positive electrode main body is disposed inside the outer peripheral contour of the negative electrode main body viewed along the overlapping direction.

In the laminated structure of the electrochemical cell, it is desirable that the outer peripheral contour of the positive electrode main body be disposed inside the outer peripheral contour of the negative electrode main body. When the amount of protrusion of the outer peripheral contour of the positive electrode main body is large, there is a possibility of deposition of a metal constituting ions to be applied to the electrochemical cell, and a possibility of capacity reduction.
For this reason, a configuration is used in which the positive electrode is covered with a separator having an overhanging portion covering the front and back surfaces and the circumferential surface of the positive electrode body, and the outer peripheral contour of the overhanging portion of the separator and the outer peripheral contour of the negative electrode main body are overlapped in a zigzag state It is preferable to align.

[3 ] An electrochemical cell according to an embodiment of the present invention includes: a plurality of positive electrode bodies arranged side by side; and a beaded positive electrode having a beaded connection having electrode connection parts connecting two adjacent positive electrode bodies. The negative electrode includes a plurality of negative electrode bodies arranged in a row, and a plurality of negative electrode electrodes each having an electrode connection portion connecting two adjacent negative electrode bodies, and a separator disposed between the positive electrode and the negative electrode. The lengths of the plurality of electrode connection portions in the positive electrode are the same, and the lengths of the plurality of electrode connection portions in the negative electrode are the same, and one or two of the positive electrodes in the middle portion of the beaded string A reference overlapping portion is formed by overlapping one or two negative electrodes of the middle part of the beaded bead through the separator, and the beaded bead is formed on one side with reference to the reference superposed portion. A positive electrode and the beaded negative electrode are alternately stacked in a zigzag form via the separator, and on the other side, the beaded positive electrode and the beaded negative electrode are alternately laminated in a zigzag form via the separator. And the outer peripheral contour of the positive electrode main body viewed along the overlapping direction is misaligned for each overlapping layer, and the outer peripheral contour of the positive electrode main body is the outer peripheral contour of the negative electrode main body in the layer having the largest displacement amount. It is characterized in that it is disposed inside .

[5 ] An electrochemical cell according to an embodiment of the present invention includes: a plurality of positive electrode bodies arranged side by side; and a beaded positive electrode having a beaded connection having an electrode connection portion connecting two adjacent positive electrode bodies. The negative electrode includes a plurality of negative electrode bodies arranged in a row, and a plurality of negative electrode electrodes each having an electrode connection portion connecting two adjacent negative electrode bodies, and a separator disposed between the positive electrode and the negative electrode. A reference overlapping portion is formed by overlapping one or two negative electrodes of the bead-like middle part with one or two of the positive electrodes of the bead-like middle part via the separator. The beaded positive electrode and the beaded negative electrode are alternately stacked in a zigzag manner on one side with the separator on the other side, and the beaded positive electrode and the beaded positive electrode on the other side. A beaded negative electrode is alternately stacked in a zigzag manner via the separator, and the positive electrode and the negative electrode are superimposed on one side with respect to the reference superimposed portion, and the end side is closer to the end than the start end of the overlap. In the overlapping of the positive electrode main body and the negative electrode main body in the overlapping direction of the respective outer peripheral contours seen along the overlapping direction, in the overlapping of the positive electrode and the negative electrode on the other side, At the terminal end side, it is characterized in that the positional deviation amount of the respective outer peripheral contours seen along the overlapping direction of the positive electrode body and the negative electrode body is increased .
[6] In the electrochemical cell of the one aspect, in the overlapping portion of the positive electrode and the negative electrode, the outer peripheral contour of the positive electrode main body is disposed inside the outer peripheral contour of the negative electrode main body viewed along the overlapping direction. Can be adopted.
[7] In the electrochemical cell according to one aspect, either or both of the beaded positive electrode main body and the beaded negative electrode main body are connected in a linear, L or U shape. It is preferable that it is a negative electrode or a positive electrode.
[8] In the electrochemical cell of the one aspect, a configuration in which the connection electrode terminal is led out to one or both of a serpentine portion to one side and a serpentine portion to the other side with respect to the reference overlapping portion It can be adopted.

[ 9 ] A method of manufacturing an electrochemical cell according to an aspect of the present invention includes: a plurality of positive electrode bodies arranged side by side; and a beaded positive electrode electrode having a beaded connection having electrode connection parts connecting two adjacent positive electrode bodies. The beads are connected to one or two positive electrodes in the middle of the bead-like connection by using a bead-like like anode electrode having a plurality of negative electrode bodies arranged side by side and an electrode connection portion connecting two adjacent negative electrode bodies. One or two negative electrodes in the middle of the loop are stacked via the separator to form a reference overlapping portion, and the beaded positive electrode and the bead are connected on one side with respect to the reference overlapping portion. Of the negative electrodes are alternately stacked in a zigzag manner via the separator, and on the other side, the negative electrode of the bead-like connection and the negative electrode of the bead-like connection are alternately arranged. Wherein the laminated over the zigzag.

[ 10] In the method of manufacturing an electrochemical cell according to the above aspect, the outer periphery of the positive electrode body is located inside the outer peripheral contour of the negative electrode body as viewed along the overlapping direction in the overlapping portion of the positive electrode and the negative electrode. It is preferable to arrange the contours.

[ 11] In the method of manufacturing an electrochemical cell of the one aspect, the reference is made using a positive electrode having the same length of the plurality of electrode connections and a negative electrode having the same length of the plurality of electrode connections. The positional deviation is made such that the outer peripheral contour of the positive electrode main body seen along the overlapping direction is misaligned for each overlapping layer in the overlapping on one side with reference to one side and the other side of the overlapping part In the layer having the largest amount, the outer peripheral contour of the positive electrode body is overlapped so as to be inside the outer peripheral contour of the negative electrode body, and in the overlapping on the other side, the outer peripheral contour of the positive electrode body viewed along the overlapping direction It is preferable to overlap so that the outer peripheral contour of the positive electrode body is inside the outer peripheral contour of the negative electrode body in the layer having the largest amount of positional displacement so that the positional deviation of each of the overlapping layers occurs.

[ 12] In the method of manufacturing an electrochemical cell of the one aspect, in the overlapping of the positive electrode and the negative electrode on one side with respect to the reference overlapping part, on the end side from the start side of the overlapping In the superposition of the positive electrode and the negative electrode on the other side, the start point of the superposition is superimposed so that the positional deviation amount of the respective outer peripheral contours seen along the superposition direction of the positive electrode body and the negative electrode body becomes large. From the side to the end side, it is preferable to overlap so that the positional deviation amounts of the respective outer peripheral contours seen along the overlapping direction of the positive electrode body and the negative electrode body become large.

[ 13] In the method of manufacturing an electrochemical cell according to the one aspect, the connection electrode terminal is led out to one or both of a serpentine portion to one side and a serpentine portion to the other side with reference to the reference overlapping portion. Is preferred.

[ 14] In the method of manufacturing an electrochemical cell according to the above aspect, either or both of the beaded positive electrode body and the beaded negative electrode body are either linear, L-shaped or U-shaped. It is preferable that it is a connected negative electrode or positive electrode.

[9] A method of manufacturing an electrochemical cell according to an aspect of the present invention includes: a plurality of positive electrode bodies arranged side by side; and a beaded positive electrode electrode having a plurality of electrode connection portions connecting two adjacent positive electrode bodies. The beads are connected to one or two positive electrodes in the middle of the bead-like connection by using a bead-like like anode electrode having a plurality of negative electrode bodies arranged side by side and an electrode connection portion connecting two adjacent negative electrode bodies. one or two negative electrode shaped for middle portions superposed over the separators to constitute a reference composition unit, based on the reference overlapping portions, the daisy-chain-like positive electrode and the strung like on one side The negative electrodes are alternately stacked in a zigzag manner via the separator, and on the other side, the positive electrode in the form of beads and the negative electrode in the form of beads are alternately provided via the separator. Characterized by laminating Zura folding shape.

Claims (12)

A plurality of positive electrode bodies arranged side by side, and a beaded positive electrode having a beaded connection having an electrode connection portion connecting two adjacent positive electrode bodies;
A plurality of negative electrode bodies arranged in a row, and a beaded negative electrode electrode having an electrode connection portion connecting two adjacent negative electrode bodies;
A separator disposed between the positive electrode and the negative electrode;
A reference overlapping portion is formed by overlapping one or two negative electrodes of the bead-like middle part with the one or two positive electrodes of the bead-like middle part via the separator, and this reference superposition The beaded positive electrode and the beaded negative electrode are alternately stacked in a zigzag manner on one side with the separator as a reference, and the beaded positive electrode and the beaded negative electrode are placed on the other side. An alternating electrochemical cell, characterized in that they are alternately stacked in a serpentine fashion via the separator.   The outer peripheral contour of the positive electrode main body is disposed inside the outer peripheral contour of the negative electrode main body viewed along the overlapping direction in the overlapping portion of the positive electrode and the negative electrode. Electrochemical cell. The lengths of the plurality of electrode connection portions in the positive electrode are the same, and the lengths of the plurality of electrode connection portions in the negative electrode are the same.
The outer peripheral contour of the positive electrode main body viewed along the overlapping direction is misaligned for each overlapping layer, and the outer peripheral contour of the positive electrode main body is inside the outer peripheral contour of the negative electrode main body in the layer having the largest displacement amount. An electrochemical cell according to claim 1, characterized in that it is arranged. Based on the reference superposition unit,
In the superposition of the positive electrode and the negative electrode on one side, the amount of positional deviation of the respective outer peripheral contours seen along the overlapping direction of the positive electrode body and the negative electrode body from the start end side to the end side of the overlap Be enlarged,
In the superposition of the positive electrode and the negative electrode on the other side, the amount of positional deviation of the respective outer peripheral contours seen along the overlapping direction of the positive electrode body and the negative electrode body from the start end side to the end side of the overlap is The electrochemical cell according to any one of claims 1 to 3, characterized in that it is enlarged.   The connection electrode terminal is derived from one or both of a serpentine portion to one side and a serpentine portion to the other side based on the reference overlapping portion. An electrochemical cell according to any one of the preceding claims.   One or both of the beaded positive electrode main body and the beaded negative electrode main body are a negative electrode or a positive electrode connected in a linear shape, an L shape or a U shape. The electrochemical cell according to any one of claims 1 to 5. A beaded positive electrode having a plurality of positive electrode bodies arranged side by side and an electrode connection portion connecting two adjacent positive electrode bodies,
Using a beaded negative electrode having a plurality of negative electrode bodies arranged side by side and an electrode connection part connecting two adjacent negative electrode bodies,
A reference overlapping portion is formed by overlapping one or two negative electrodes of the bead-like middle part with the one or two positive electrodes of the bead-like middle part via the separator, and this reference overlapping part The beaded positive electrode and the beaded negative electrode are alternately stacked in a zigzag manner on one side with the separator on the other side, and the beaded positive electrode and the beaded negative electrode are arranged on the other side. A method of manufacturing an electrochemical cell, comprising alternately stacking in a zigzag manner via the separators.   The outer peripheral contour of the positive electrode main body is disposed inside the outer peripheral contour of the negative electrode main body viewed along the overlapping direction in the overlapping portion of the positive electrode and the negative electrode. Method of manufacturing an electrochemical cell. The positive electrode having the same length of the plurality of electrode connections and the negative electrode having the same length of the plurality of electrode connections,
Based on the reference superposition unit,
In the layering on one side, the outer peripheral contour of the positive electrode body in the layer having the largest displacement amount is such that the outer peripheral contour of the positive electrode body seen along the overlapping direction is misaligned for each overlapping layer. Overlap so as to be inside the outer peripheral contour of the negative electrode body,
In the layering on the other side, the outer peripheral contour of the positive electrode body in the layer having the largest displacement amount is such that the outer peripheral contour of the positive electrode body seen along the overlapping direction is misaligned for each overlapping layer. The method of manufacturing an electrochemical cell according to claim 7, wherein the layers are overlapped so as to be inside the outer peripheral contour of the negative electrode body. Based on the reference superposition unit,
In the superposition of the positive electrode and the negative electrode on one side, the amount of positional deviation of the respective outer peripheral contours seen along the overlapping direction of the positive electrode body and the negative electrode body from the start end side to the end side of the overlap Superimpose to get bigger,
In the superposition of the positive electrode and the negative electrode on the other side, the amount of positional deviation of the respective outer peripheral contours seen along the overlapping direction of the positive electrode body and the negative electrode body from the start end side to the end side of the overlap is The method of manufacturing an electrochemical cell according to claim 7, wherein the cells are stacked to be large.   11. The connection electrode terminal according to claim 7, wherein the connection electrode terminal is led out to one or both of a serpentine portion to one side and a serpentine portion to the other side with reference to the reference overlapping portion. The manufacturing method of the electrochemical cell as described in one term.   One or both of the beaded positive electrode main body and the beaded negative electrode main body are a negative electrode or a positive electrode connected in a linear shape, an L shape or a U shape. The manufacturing method of the electrochemical cell as described in any one of Claims 7-11.

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