JP4784687B2 - Flat battery and battery pack using the same - Google Patents

Description

  The present invention relates to a flat battery and an assembled battery using the same.

  Conventionally, metal battery cans have been used for battery outer bodies, and their sizes have been adjusted and used according to applications such as cylindrical, rectangular, and coin types. In recent years, particularly in the field of portable devices and the like, with the reduction in weight and thickness, there has been a strong demand for reduction in weight and thickness of batteries as power sources.

  Since batteries using metal battery cans are limited in terms of weight reduction and thickness reduction, in recent years, an exterior body constituted by heat sealing a laminated film in which a resin film and a metal film are laminated and integrated Research and development of a battery using a battery has been actively carried out, and a film-covered battery that has achieved a significant reduction in weight and thickness has been put into practical use.

  However, at the time of charging / discharging of the battery, the electrode terminal and the battery element generate heat due to the presence of the resistance of the electrode terminal and the internal resistance of the battery, and this heat may open the sealing portion of the outer package. The opening of the sealing portion causes moisture intrusion into the exterior body, causing significant deterioration in battery performance, leading to a decrease in reliability.

  There are various known techniques for assembled batteries composed of a plurality of film-clad batteries. For example, the assembled batteries disclosed in Japanese Patent Application Laid-Open Nos. 2001-216950 and 9-259859 are mainly used for portable electronic devices and the like and are not scheduled to be used under a large current. Therefore, it is difficult to divert as it is for use under a large current.

  On the other hand, in recent years, film-clad batteries have come to be used in power applications for electric vehicles and ships that require a larger current supply. In the above application, since a high voltage and a high capacity are achieved by connecting a large number of single cells and using them as an assembled battery, heat generation is remarkably greater than when using them as single cells. Therefore, in addition to the above-described adverse effects, the temperature rise of the entire assembled battery has become remarkable. If this temperature rise becomes too large, the battery life may be shortened or the battery may be damaged. In particular, in the case of a lithium ion battery, an organic solvent is used for the electrolyte and carbon or the like is used for the negative electrode active material. If the battery is damaged due to abnormally high temperature, there is a possibility of causing danger to the surroundings such as ignition. there were.

JP 2001-216950 A Japanese Patent Laid-Open No. 9-259859

  In view of the above circumstances, an object of the present invention is to provide a highly reliable film-clad battery in which heat generation from battery elements and electrode terminals is reduced.

  According to the present invention for solving the above-mentioned problems, a flat battery comprising a positive electrode terminal and a negative electrode terminal that are separated from each other and led to an outer peripheral edge, wherein the positive electrode terminal and the negative electrode terminal are each B / A ≧ A flat battery characterized by satisfying 0.57 (where A represents the width of the active material region and B represents the electrode terminal width) is provided.

  In the present invention, the width of the active material region is the width of the active material region in the positive electrode body or the negative electrode body, and is the narrowest width in the direction perpendicular to the direction in which the electrode terminals extend. Say. When the active material region is rectangular, the width of the active material region is equal to the length of the electrode terminal extraction side, that is, the length of the side where the electrode terminal extends.

  In a conventional battery having a plurality of terminals on one side, B / A was less than 0.5. Japanese Patent Application Laid-Open No. 9-259859 discloses a battery that employs a configuration in which electrode terminals are led out into the outer peripheral end recesses of the battery. The purpose of this is to secure a planar area of the battery element part and increase the voltage and capacity, while at the same time reducing the outer shape of the electrode terminal by leading it into the outer peripheral edge recess. is there. In view of the above object, there is no reason to positively widen the electrode terminal, but rather widening the electrode is disadvantageous from the viewpoint of voltage and capacity. On the other hand, in the present invention, by setting B / A ≧ 0.57, the current passing distance is shortened and the internal resistance is reduced. As a result, heat generation from the battery element is suppressed. Moreover, since the resistance of an electrode terminal is reduced by setting the width | variety of an electrode terminal wide, the heat_generation | fever from an electrode terminal is also suppressed. Further, the connection is facilitated and the mechanical strength of the electrode terminal is increased.

  According to the present invention, there is also provided a flat battery characterized in that in the flat battery, the positive electrode terminal and the negative electrode terminal are led out to face each other.

  By connecting the positive and negative terminals opposite to each other, it is easy to connect when stacking batteries to make an assembled battery, and by changing the orientation of each battery, series, parallel, and series-parallel type Various connected assembled batteries such as assembled batteries can be obtained.

  In addition, according to the present invention, there is provided a flat battery characterized in that the flat battery includes an exterior body made of a metal thin film.

  As a result, the exterior body can be reduced in weight, and moisture intrusion into the exterior body can be prevented.

  According to the present invention, there is provided a flat battery characterized in that the flat battery has an exterior body made of a laminate film including a metal thin film and a heat-fusible resin film.

  Thereby, joining of an exterior film can be performed easily and reliably.

  According to the present invention, there is also provided a flat battery characterized in that in the flat battery, the metal thin film is aluminum.

  Thereby, it becomes possible to reduce the weight of the exterior body.

  According to the present invention, there is also provided an assembled battery in which a plurality of the flat batteries are combined through the positive terminal or the negative terminal.

  According to the present invention, there is provided the assembled battery, wherein the plurality of flat batteries are connected in series.

  In addition, according to the present invention, there is provided an assembled battery in which a plurality of the flat batteries are stacked.

  In addition, according to the present invention, there is provided an assembled battery in which the plurality of stacked flat batteries are connected in parallel with each other in the assembled battery.

  Moreover, according to this invention, the assembled battery formed by mutually connecting a plurality of said assembled batteries in series is provided.

  An assembled battery having a desired voltage and capacity can be obtained by connecting a plurality of the flat batteries. In the above assembled battery, since the internal resistance of each flat battery and the resistance of the electrode terminal are reduced, heat generation during charging / discharging due to a large current can be effectively suppressed, and the temperature rise of the entire assembled battery can be suppressed. It can be mitigated. In addition, since the heat radiation countermeasure work applied to the electrode terminals is not required, it is possible to configure a lightweight, inexpensive and highly reliable assembled battery. In addition, by connecting a plurality of the above-mentioned batteries side by side in the planar direction, stacking and connecting in the vertical direction, or connecting them together, it is possible to freely use the space in series, in parallel, A series-parallel battery pack can be obtained.

  As described above, in the present invention, by configuring the battery so that the width A of the active material region and the electrode terminal width B satisfy B / A ≧ 0.57, A highly reliable flat battery with reduced heat generation can be provided.

  In addition, since the flat battery of the present invention does not generate heat from the electrodes, it is not necessary to take measures against heat generation at the electrode terminals. Therefore, a combination of a plurality of the above flat batteries can provide a lightweight, inexpensive, and space-efficient battery pack. It can be configured.

It is a perspective view of the film-clad battery of this invention. It is a disassembled perspective view of the battery element of the film-clad battery of this invention. It is sectional drawing of the battery element of the film-clad battery of this invention. It is a schematic diagram for demonstrating the dimensional ratio of the positive electrode body or negative electrode body of a battery of this invention, and an electrode terminal. It is the graph which showed the relationship between the ratio of the terminal width with respect to the electrode extraction width | variety, and electric current passage distance. It is the graph which showed the relationship between terminal width and internal resistance. It is the graph which showed the relationship between terminal width and a cell internal resistance ratio. It is sectional drawing for demonstrating the structure of the assembled battery of this invention. It is a schematic diagram for demonstrating the structure of an assembled battery. It is a schematic diagram for demonstrating the structure of an assembled battery. It is a schematic diagram for demonstrating the structure of an assembled battery. It is a schematic diagram for demonstrating the structure of the assembled battery of 4 series one side current collection terminal taking-out type. It is a schematic diagram for demonstrating the structure of the assembled battery of 8 series one side current collection terminal taking-out type. It is a schematic diagram for demonstrating the structure of the assembled battery of 3 series both-sides current collection terminal taking-out type. It is a schematic diagram for demonstrating the structure of the assembled battery of 6 series both-side current collection terminal taking-out type. It is a schematic diagram for demonstrating the structure of the assembled battery of 9 series both sides current collection terminal taking-out type. It is a schematic diagram for demonstrating the structure of the parallel assembled battery of a both-sides current collection terminal taking-out type. It is a schematic diagram for demonstrating the structure of a 2 series 4 parallel type one side current collection terminal taking-out type series parallel assembled battery. It is a schematic diagram for demonstrating the structure of a 4 series 3 parallel type one side current collection terminal taking-out type series parallel assembled battery. It is a schematic diagram for demonstrating the structure of a series-parallel assembled battery of the 8 series 2 parallel type one side current collection terminal taking-out type. It is a schematic diagram for demonstrating the structure of the 3 series 6 parallel type | mold both-side current collection terminal taking-out type series parallel assembled battery. It is a schematic diagram for demonstrating the structure of the 6 series 3 parallel type | mold both-sides current collection terminal taking-out type series parallel assembled battery. It is a schematic diagram for demonstrating the structure of the 9 series 2 parallel type | mold both-side current collection terminal taking-out type series parallel assembled battery. It is a schematic diagram for demonstrating the width | variety of an active material area | region. It is a schematic diagram for demonstrating the width | variety of an active material area | region.

  Next, an example of an embodiment of the present invention will be described with reference to the drawings.

  1 is a perspective view of a film-clad battery according to the present invention, FIG. 2 is an exploded perspective view of the battery element of the battery of FIG. 1, and FIG. 3 is a cross-sectional view of the battery element. As shown in FIG. 3, the negative electrode bodies 1 and the positive electrode bodies 2 are alternately arranged in the space partitioned by the laminated separator 3, and the negative electrode current collectors 7 extending from the ends of the respective negative electrode bodies 1 are interposed. A negative electrode terminal 4 is provided. Similarly, the positive electrode is provided with a positive electrode terminal 5 via a positive electrode current collector 8 extending from the end of each positive electrode body 2. Further, as shown in FIG. 3, the negative electrode current collector 7 and the positive electrode current collector 8, and the negative electrode terminal 4 and the positive electrode terminal 5 are extended in opposite directions.

  FIG. 4 is a schematic diagram for explaining a dimensional ratio between a positive electrode body or a negative electrode body and an electrode terminal of the flat battery according to the present invention. The active material region 13 is a region where the active material on the current collector is applied, and the electrode terminal attachment portion 15 is a region where the active material is not applied. The electrode terminal 14 is mounted on the electrode terminal mounting portion 15. In the figure, A represents the width of the active material region, B represents the electrode terminal width, and C represents the length of the active material region.

  Since the active material region 13 shown in FIG. 4 is rectangular, the width of the active material region 13 is constant. However, in the case of the positive electrode body or the negative electrode body having the active material region 13 having the shape as shown in FIG. 24 or FIG. 25, the width of the active material region 13 varies depending on the location. The width of the active material region in such a case refers to the width of the active material region 13 and the narrowest width in the direction perpendicular to the direction in which the electrode terminal 14 extends. That is, in FIG. 24 or FIG. 25, A ′, not A, is the width of the active material region. This is because a later-described current passing distance is determined depending on the narrowest width among the widths of the active material region 13.

  In the flat battery according to the present invention, the dimensions of the negative electrode body 1, the positive electrode body 2, the negative electrode terminal 4, and the positive electrode terminal 5 are determined so that the B / A value is 57% or more. By adopting the above configuration, heat generation from the battery element can be suppressed. The reason will be described later.

  The battery element shown in FIG. 3 is housed in the film outer package 6, and after the electrolyte is injected into the outer package, the film is sealed to obtain the film outer battery shown in FIG. For the film outer package 6, a laminate film composed of at least two layers of a metal thin film and a heat-fusible resin film can be used.

  Here, the reason why the heat generation from the battery can be suppressed when the configuration in which the value of B / A is 57% or more will be described.

  First, because the resistance of the electrode terminal itself is lowered by increasing the width B of the electrode terminal, heat generation from the electrode terminal is suppressed. In conventional batteries, the B / A value is almost 10 to 30% in most cases, and positive and negative electrode terminals are often extended from the same side of the battery. In order to avoid contact, even a wide one has to be less than 50%. In the present invention, since the B / A value is 57% or more, the above effect can be obtained.

  Secondly, by setting the B / A value to 57% or more, the current passage path can be shortened, and thus heat generation from the battery element is suppressed. The current passing distance in this embodiment refers to an average value of distances of all current paths that can be theoretically taken. FIG. 5 is a graph showing the relationship between B / A and the current passing distance obtained by simulation in the model of FIG. In the figure, the current passing distance is displayed as a ratio when the current passing distance when the terminal width is 1 mm is 100%. Since the current passing distance and the heat generation amount are in a proportional relationship, the heat generation amount is suppressed as the current passing distance is shortened. Referring to FIG. 5, it can be seen that the value of the current passing distance is small when the B / A value is 57% or more regardless of the ratio of C and A. Therefore, when the B / A value is 57% or more, the calorific value is effectively suppressed. Furthermore, since the reduction of the current passing distance has the effect of reducing the internal resistance of the battery, this also contributes to the suppression of heat generation from the battery element.

  Moreover, the said battery can be made into a single battery, and a some battery can be connected and the assembled battery of desired voltage and capacity | capacitance can be comprised. For example, an assembled battery by parallel connection can be obtained by stacking and connecting positive and negative electrodes together. In addition, when the positive and negative electrodes are alternately connected when stacking, an assembled battery by series connection is obtained. Furthermore, the assembled battery can be configured by using both parallel connection and series connection, and a series, parallel, and series-parallel assembled battery having a free layout and effectively using space can be obtained.

  Further, in the above assembled battery, since the internal resistance of each battery and the resistance of the electrode terminal are reduced, heat generation during charging / discharging due to a large current can be effectively suppressed, and the temperature rise of the entire assembled battery can be suppressed. It can be mitigated. In addition, since the heat radiation countermeasure work applied to the electrode terminals is not required, it is possible to configure a lightweight, inexpensive and highly reliable assembled battery.

In this embodiment, the case where the positive and negative electrode terminals are extended in opposite directions has been described. However, for example, the positive and negative electrode terminals may be arranged on two adjacent sides, or two pairs The positive and negative electrode terminals may be arranged on four sides. With such a configuration, there is an advantage that the degree of freedom when laying out in the plane direction is increased.
(Example 1)

  Next, based on an Example, this invention is demonstrated in detail.

As shown in FIGS. 2 and 3, the negative electrode body 1 in which hard carbon is coated on both sides by about 50 μm on a 15 μm thick copper foil sheet, and the lithium manganese composite oxide is coated on both sides by about 70 μm on a 20 μm thick aluminum foil sheet. The positive electrode body 2 and a porous insulating resin thin film sheet having a thickness of 25 μm, and laminated separators 3 formed by laminating a polyethylene film and a polypropylene film were alternately laminated. As shown in FIG. 3, the negative electrode current collector 7 and the positive electrode current collector 8 are drawn out so as not to overlap the stacked power generation element bodies, and are respectively made of 100 μm thick nickel on the negative electrode current collector 7 and the positive electrode current collector 8. The negative electrode terminal 4 and the positive electrode terminal 5 made of 100 μm thick aluminum were welded using ultrasonic welding and resistance welding. Thereafter, as shown in FIG. 1, it is wrapped with a laminate film of about 100 μm aluminum foil, and lithium hexafluorophosphate is dissolved in a non-aqueous solvent of propylene carbonate and methyl ethyl carbonate so that the concentration becomes 1 mol / L. A secondary battery was produced by injecting the electrolyte solution and sealing under reduced pressure. Here, the external dimensions of the battery (excluding electrode terminal protrusions) are 95 mm × 160 mm, the negative electrode body 1 used is 70 mm × 125 mm, the positive electrode body 2 is 65 mm × 120 mm, and the laminated separator 3 is 75 mm. The dimensions of the negative electrode terminal 4 and the positive electrode terminal 5 were both 40 mm in length and 40 mm in width. Therefore, the B / A values of the negative electrode and the positive electrode were 0.57 and 0.62, respectively.
(Example 2)

Although it was set as the structure similar to Example 1, about the width | variety of the negative electrode terminal 4 and the positive electrode terminal 5, it was 50 mm. Therefore, the B / A values of the negative electrode and the positive electrode were 0.71 and 0.77, respectively.
(Comparative Example 1)

Although it was set as the structure similar to Example 1, about the width | variety of the negative electrode terminal 4 and the positive electrode terminal 5, it was 10 mm. Therefore, the B / A values of the negative electrode and the positive electrode were 0.14 and 0.15, respectively.
(Comparative Example 2)

Although it was set as the structure similar to Example 1, about the width | variety of the negative electrode terminal 4 and the positive electrode terminal 5, it was 20 mm. Therefore, the B / A values of the negative electrode and the positive electrode were 0.29 and 0.31, respectively.
(Comparative Example 3)

  Although it was set as the structure similar to Example 1, about the width | variety of the negative electrode terminal 4 and the positive electrode terminal 5, it was 30 mm. Therefore, the B / A values of the negative electrode and the positive electrode were 0.43 and 0.46, respectively.

  Therefore, in Examples 1 and 2, the B / A value is 57% or more, and in Comparative Examples 1 to 3, the B / A value is less than 57%.

  FIG. 6 is a graph showing the relationship between the electrode terminal width and the cell DC resistance effective value of the batteries of Examples 1 and 2 and Comparative Examples 1 to 3. The cell DC resistance effective value is the sum of the terminal resistance and the resistance of the power generation element (cell internal resistance). It can be seen that the terminal resistance is reduced by widening the electrode terminal width, and in Examples 1 and 2, the resistance value is reduced to about 25% of the resistance value of Comparative Example 1.

  In addition, referring to FIG. 7, when the ratio of the cell internal resistance when the cell internal resistance with a terminal width of 10 mm is taken as 100%, the cell internal resistance is also reduced in the first and second embodiments. You can see that This effect is considered to be brought about by shortening the current passing distance, and contributes to suppression of heat generation from the battery element.

Next, the battery of Example 1 or 2 will be described in detail with reference to an example of an assembled battery configured by using a plurality of single batteries.
(Example 3)

  FIG. 8A shows an assembled battery in which two cells are connected in parallel and then three are connected in series. This will be referred to as a 3 series 2 parallel type, and hereinafter, a case where X pieces of cells connected in parallel are connected in series to Y pieces will be referred to as a Y series X parallel type.

First, three 2-parallel units with two cells stacked are manufactured, and then the negative electrode current collector 7 and the positive electrode current collector 8 of the parallel unit are alternately connected by ultrasonic welding, spot welding, caulking, or the like. did. For convenience, the current collector connecting portion 9 is provided in FIG. 8A, which is a portion connected by welding or caulking. Finally, the parallel units were stacked in three stages as shown in FIG. 8 (a) to obtain a three-series and two-parallel battery pack with two current collecting terminals taken out.
Example 4

  The present embodiment relates to a two-by-three battery pack.

  FIG. 8B is a diagram showing the configuration of a two-by-three battery pack. First, two three parallel units each having three unit cells are produced, and the positive electrode current collector 8 of one parallel unit and the negative electrode current collector 7 of the other parallel unit are ultrasonically welded, spot welded, or caulked. Etc. were connected alternately. For convenience, the current collector connecting portion 9 is also provided in FIG. 8B, but this portion is a portion connected by welding or caulking. Finally, the two parallel units were stacked in two stages as shown in FIG. 8B to obtain a two-line / three-parallel type assembled battery of one-side current collecting terminal extraction type.

  As shown in Examples 3 and 4, by changing the connection method between the electrode terminals, it is possible to draw out the current collecting terminal freely from one side or both sides of the assembled battery.

Furthermore, although an Example is shown in order to show the variation of an assembled battery, the description of the symbol in the figure used in the case of these description is given using FIG. FIG. 9 is a diagram showing a two-by-one assembled battery. In the figure, the black circle represents the negative electrode terminal 4, the white circle represents the positive electrode terminal 5, the shaded rectangle represents the unit cell, and the line connecting the black circle and the white circle represents the current collector connection portion 9. The current collector connecting portion 9 is connected in the same manner as described in the third and fourth embodiments. A line drawn from the negative electrode terminal 4 or the negative electrode current collector 7 represents the negative electrode current collector terminal 10, and a line drawn from the positive electrode terminal 5 or the positive electrode current collector 8 represents the positive electrode current collector terminal 11. In the case of a series-parallel battery pack, for example, as shown in FIG.
(Example 5)

  The present embodiment relates to a 6-by-1 parallel battery.

FIG. 10 shows a configuration of a 6-series-parallel battery pack in which all 6 unit cells are connected in series. In the case of the 6-line 1-line type, it is possible to stack 6 unit cells in one place as shown in FIG. 10 (a), or to stack all the cells without stacking as shown in FIG. 10 (b). A cell can also be developed on a plane. Further, as shown in FIGS. 10 (c) and 10 (d), it is possible to stack two or three places, and it is possible to lay out freely.
(Example 6)

  The present embodiment relates to a 6-by-1 direct battery assembly.

  FIG. 11 shows a 6-by-1 direct battery assembly constructed by stacking and connecting six unit cells with the positive and negative electrodes aligned. In the case of 6 parallel 1 straight type, only this configuration can be adopted.

  As mentioned above, although the Example of the assembled battery which concerns on this invention was shown in Examples 3-6, since the internal resistance of each battery and the resistance of an electrode terminal are reduced in the said assembled battery, charging by large current is carried out. Heat generation during discharging can be effectively suppressed, and the temperature rise of the entire assembled battery can be mitigated. In addition, since the heat radiation countermeasure work applied to the electrode terminals is not required, it is possible to configure a lightweight, inexpensive and highly reliable assembled battery.

  In addition, as shown in the above embodiment, a plurality of the batteries are connected in a plane direction, stacked in the vertical direction and connected together, or a combination of these is used to provide a free layout and space. It is possible to obtain a series, parallel, and series-parallel assembled battery that is effectively utilized.

In addition, although the example of the assembled battery at the time of using six unit cells was shown in the said Example, the structure of various assembled batteries is changed by changing the number of the unit cells to be used, and the number of the places which laminate | stack a unit cell. Is possible. Examples are given below.
(Example 7)

  The present embodiment relates to a series assembled battery of a single side collecting terminal take-out type.

FIG. 12 and FIG. 13 show a configuration example of a series assembled battery of a single side collecting terminal take-out type. FIG. 12 shows an assembled battery configuration in the case of 4 series, and FIG. 13 shows an assembled battery configuration in the case of 8 series. FIG. 12A shows a configuration in which four positive and negative cells of four cells are alternately connected and stacked in four stages. FIG. 12B shows a configuration in which the positive and negative electrodes of four unit cells are alternately connected in two stages. Moreover, Fig.13 (a) has the structure which piled up what connected the positive / negative electrode of eight unit cells alternately in 8 steps | paragraphs. FIG. 13B shows a configuration in which the positive and negative electrodes of eight single cells are alternately connected and stacked in four stages. FIG. 13C shows a configuration in which the positive and negative electrodes of eight single cells are alternately connected and stacked in two stages. As shown in FIG. 12 and FIG. 13, when the current collecting terminal is drawn out from one side with a series assembled battery, it can be realized by using an even number of secondary batteries and stacking them in an even number of stages. The number of even stages to be overlapped is a common divisor of the number of secondary batteries to be configured and an even number not exceeding the number of secondary batteries to be configured, and there are combinations corresponding to the number of the common divisors.
(Example 8)

  The present embodiment relates to a series assembled battery of both-side current collecting terminal extraction type.

A configuration example of a series assembled battery of the both-side current collecting terminal extraction type is shown in FIGS. FIG. 14 shows an assembled battery configuration in the case of 3 series, FIG. 15 shows an assembled battery configuration in the case of 6 series, and FIG. 16 shows an assembled battery configuration in the case of 9 series. FIG. 14A shows a configuration in which three positive and negative cells of three cells are alternately connected and stacked in three stages. FIG. 14B shows a configuration in which the positive and negative electrodes of three single cells are alternately connected to each other without overlapping. FIG. 15A shows a configuration in which the positive and negative electrodes of six single cells are alternately connected and stacked in three stages. FIG. 15 (b) shows a configuration in which the positive and negative electrodes of six single cells are alternately connected in a single stage without overlapping. FIG. 16A shows a configuration in which nine positive and negative cells of nine cells are alternately connected and stacked in nine stages. FIG. 16B shows a configuration in which nine cells are alternately connected in positive and negative directions in three stages. FIG. 16 (c) shows a configuration in which nine positive and negative cells of nine cells are alternately connected and not stacked. As shown in FIGS. 14 to 16, when the current collecting terminal is drawn out from both sides in a series assembled battery, it can be realized by stacking in an odd number regardless of the number of secondary batteries to be configured. The number of stacked odd stages is a common divisor of the number of secondary batteries to be configured and an odd number not exceeding the number of secondary batteries to be configured, and there are combinations corresponding to the number of the common divisors.
Example 9

  The present embodiment relates to a parallel assembled battery in which both-side current collecting terminals are taken out.

FIG. 17 shows a configuration diagram of a parallel assembled battery of the both-side current collecting terminal extraction type. As can be seen from FIG. 17, in the case of the parallel connection, only the both-side current collecting terminal extraction type can be configured, and the number of parallel connections is simply overlapped.
(Example 10)

  The present embodiment relates to a series-parallel assembled battery of a single side collecting terminal take-out type.

  FIG. 18 to FIG. 20 show a configuration example of a series-parallel assembled battery of one-side current collecting terminal extraction type. FIG. 18 shows a 2-serial 4-parallel assembled battery configuration, FIG. 19 shows a 4-serial 3-parallel assembled battery configuration, and FIG. 20 shows an 8-serial 2-parallel assembled battery configuration. FIG. 18 shows a configuration in which two parallel units 12 are produced by stacking the number of parallel cells from eight single cells, and the positive and negative electrodes of the parallel units 12 are alternately connected in two stages. In addition, FIG. 19A shows a configuration in which four parallel units 12 that are stacked in parallel from the number of unit cells 12 are manufactured, and the positive and negative electrodes of the parallel units 12 that are alternately connected are stacked in four stages. Yes. FIG. 19B shows a configuration in which four parallel units 12 that are stacked in parallel from the number of unit cells 12 are prepared, and the positive and negative electrodes of the parallel units 12 that are alternately connected are stacked in two stages. FIG. 20A shows a configuration in which eight parallel units 12 that are stacked in parallel from 16 single cells are produced, and the positive and negative electrodes of the parallel units 12 are alternately connected and folded in eight stages. ing. FIG. 20B shows a configuration in which eight parallel units 12 that are stacked in parallel from the 16 cells are produced, and the positive and negative electrodes of the parallel units 12 are alternately connected in four stages. FIG. 20C shows a configuration in which eight parallel units 12 that are stacked in parallel from the 16 cells are produced and two positive and negative electrodes of the parallel units 12 are alternately connected in two stages.

As shown in FIG. 18 to FIG. 20, in the case where the current collecting terminal is pulled out from one side with an assembled battery of 2 series 2 parallel type or more, the number of parallel unit stages to be stacked in an even series using 4 or more unit cells If it is an even number, it can be realized. The number of stages of the parallel units to be stacked is a common divisor of the even-numbered series number and the even number, and there are combinations corresponding to the common divisor number.
(Example 11)

  The present embodiment relates to a series-parallel assembled battery of both-side current collecting terminal extraction type.

  An example of the configuration of a series-parallel assembled battery of the both-side current collecting terminal extraction type is shown in FIGS. FIG. 21 shows a 3 series 6 parallel type assembled battery configuration, FIG. 22 shows a 6 series 3 parallel type assembled battery configuration, and FIG. 23 shows a 9 series 2 parallel type assembled battery configuration. FIG. 21A shows a configuration in which three parallel units 12 that are stacked in parallel from the number of 18 cells are produced, and the positive and negative electrodes of the parallel units 12 are alternately connected in three stages. FIG. 21 (b) shows a configuration in which three parallel units 12 are stacked in parallel from the number of 18 cells, and the positive and negative electrodes of the parallel units 12 are alternately connected to each other without overlapping. Yes. In addition, FIG. 22A is a configuration in which six parallel units 12 are stacked in parallel from the number of 18 cells, and the positive and negative electrodes of the parallel units 12 are alternately connected in three stages. Yes. FIG. 22B shows a configuration in which six parallel units 12 are stacked in parallel from the number of 18 cells, and the positive and negative electrodes of the parallel units 12 are alternately connected to each other without overlapping. Yes. FIG. 23A shows a configuration in which nine parallel units 12 that are stacked in parallel from 18 single cells are produced, and the positive and negative electrodes of the parallel units 12 are alternately connected in nine stages. FIG. 23B shows a configuration in which nine parallel units 12 that are stacked in parallel from 18 single cells are produced, and the positive and negative electrodes of the parallel units 12 are alternately connected in three stages. FIG. 23 (c) shows a configuration in which nine parallel units 12 that are stacked in parallel from 18 single cells are manufactured, and the positive and negative electrodes of the parallel units 12 are alternately connected in one stage.

  As shown in FIG. 21 to FIG. 23, in the case where the current collector terminal is drawn out from both sides with an assembled battery of two series and two parallel type or more, a parallel unit that is stacked in a free series number using four or more unit cells This can be realized if the number of stages is an odd number. The number of stages of the parallel units to be stacked is a common divisor of the serial number and the odd number, and there are combinations of the common divisors.

  As described above, as shown in the above embodiments, a plurality of the batteries are connected in a plane direction, connected in a stacked manner in the vertical direction, or connected in combination, thereby providing a free layout and space. Series, parallel, and series-parallel assembled batteries can be obtained that effectively utilize. In addition, since the internal resistance of each battery and the resistance of the electrode terminal are reduced, even when used as an assembled battery, heat generation during charging / discharging due to a large current can be effectively suppressed, and the entire assembled battery It becomes possible to mitigate the temperature rise. In addition, since the heat radiation countermeasure work applied to the electrode terminals is not required, it is possible to provide a battery pack that is lightweight, inexpensive, and highly reliable.

DESCRIPTION OF SYMBOLS 1 Negative electrode body 2 Positive electrode body 3 Laminated separator 4 Negative electrode terminal 5 Positive electrode terminal 6 Film exterior body 7 Negative electrode current collection part 8 Positive electrode current collection part 9 Current collection part connection part 10 Negative electrode current collection terminal 11 Positive electrode current collection terminal 12 Parallel unit 13 Active material region 14 Electrode terminal 15 Electrode terminal mounting portion

Claims (14)

The current collector has a plurality of positive electrode bodies coated with an active material and a negative electrode body coated with an active material on a current collector, and the current collector is coated with an active material region coated with an active material and an active material coated The positive electrode body, the negative electrode body, and the separator are alternately stacked, and the electrode terminal mounting portions of the plurality of positive electrode bodies overlap with each other in a plan view and the negative electrode body and the separator A metal thin film having a region that does not overlap with the separator, and wherein the electrode terminal mounting portions of the plurality of negative electrode bodies overlap each other in plan view and have a region that does not overlap the positive electrode body and the separator And a flat battery having an outer package made of a laminate film including a heat-fusible resin film, wherein the electrode terminal mounting portions of a plurality of the positive electrode current collectors are stacked, Positive terminal With mounted, a plurality of said electrode terminal mounting portion of the negative electrode body of the current collector is superimposed, the and the negative terminal one on the outermost outside mounted spaced apart from the positive terminal, the positive terminal and the negative electrode Terminals are opposed to each other and are led out from the outer peripheral edge of the exterior body, each of the positive terminal and the negative terminal,
B / A ≧ 0.57
(However, A represents the width of the active material region, and B represents the electrode terminal width. Note that the width of the active material region is the width of the active material region, and the direction in which the electrode terminal extends) A flat battery characterized in that the width of the electrode terminal is the width of the electrode terminal mounting portion with respect to the direction in which the electrode terminal extends. . 2. The flat battery according to claim 1, wherein a width of the electrode terminal in a direction in which the electrode terminal extends in the electrode terminal mounting portion is constant. 2. The flat battery according to claim 1, wherein the electrode terminal width is the narrowest width of the electrode terminal mounting portion with respect to the direction in which the electrode terminal extends. . The current collector has a plurality of positive electrode bodies coated with an active material and a negative electrode body coated with an active material on a current collector, and the current collector is coated with an active material region coated with an active material and an active material coated The positive electrode body, the negative electrode body, and the separator are alternately stacked, and the electrode terminal mounting portions of the plurality of positive electrode bodies overlap with each other in a plan view and the negative electrode body and the separator A metal thin film having a region that does not overlap with the separator, and wherein the electrode terminal mounting portions of the plurality of negative electrode bodies overlap each other in plan view and have a region that does not overlap the positive electrode body and the separator And a flat battery having an outer package made of a laminate film including a heat-fusible resin film, wherein the electrode terminal mounting portions of a plurality of the positive electrode current collectors are stacked, Positive terminal With mounted, a plurality of said electrode terminal mounting portion of the negative electrode body of the current collector is superimposed, the and the negative terminal one on the outermost outside mounted spaced apart from the positive terminal, the positive terminal and the negative electrode Terminals are opposed to each other and are led out from the outer peripheral edge of the exterior body, each of the positive terminal and the negative terminal,
B / A ≧ 0.57
(However, A represents the width of the active material region, and B represents the electrode terminal width. The width of the active material region is the width of the active material region, and the direction in which the electrode terminal extends) The width in the vertical direction is the narrowest, and the electrode terminal width is a width in a direction in which the electrode terminal extends in a portion in contact with the electrode terminal mounting portion. Flat battery. 5. The flat battery according to claim 4, wherein a width of the electrode terminal in a direction in which the electrode terminal extends in a portion in contact with the electrode terminal mounting portion is constant. 5. The flat battery according to claim 4, wherein the electrode terminal width is the narrowest width in a direction in which the electrode terminal extends in a portion in contact with the electrode terminal mounting portion. Flat battery. The current collector has a plurality of positive electrode bodies coated with an active material and a negative electrode body coated with an active material on a current collector, and the current collector is coated with an active material region coated with an active material and an active material coated The positive electrode body, the negative electrode body, and the separator are alternately stacked, and the electrode terminal mounting portions of the plurality of positive electrode bodies overlap with each other in a plan view and the negative electrode body and the separator A metal thin film having a region that does not overlap with the separator, and wherein the electrode terminal mounting portions of the plurality of negative electrode bodies overlap each other in plan view and have a region that does not overlap the positive electrode body and the separator And a flat battery having an outer package made of a laminate film including a heat-fusible resin film, wherein the electrode terminal mounting portions of the current collectors of the plurality of positive electrode bodies are stacked, and the outermost electrode has a fixed portion. Extended in width One with a positive terminal is attached to a plurality of said electrode terminal mounting portion of the negative electrode body of the current collector is superimposed, and its negative terminal one extending at a constant width in the outermost said positive terminal The positive electrode terminal and the negative electrode terminal are led out from the outer peripheral edge of the exterior body so as to face each other, and the positive electrode terminal and the negative electrode terminal,
B / A ≧ 0.57
(However, A represents the width of the active material region, and B represents the electrode terminal width. The width of the active material region is the width of the active material region, and the direction in which the electrode terminal extends) A flat battery characterized in that the width of the electrode terminal is the narrowest of the widths in the vertical direction, which is the width in the direction in which the electrode terminals extend . The flat battery according to any one of claims 1 to 7, wherein the electrode terminal mounting portion of the current collector of the positive electrode body is overlapped in a planar shape. The flat battery according to any one of claims 1 to 8, wherein the electrode terminal mounting portion of the current collector of the negative electrode body is overlapped in a planar shape. The assembled battery which the flat type battery of any one of Claims 1 thru | or 9 combines in multiple numbers via the said positive electrode terminal or a negative electrode terminal. The assembled battery according to claim 10 , wherein the plurality of flat batteries are connected in series. The assembled battery according to claim 11 , wherein a plurality of the flat batteries are stacked. The assembled battery according to claim 10, wherein the plurality of stacked flat batteries are connected in parallel. An assembled battery comprising a plurality of assembled batteries according to claim 13 connected in series.

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