JP6696173B2 - Method for manufacturing power storage device module - Google Patents

Description

  The present invention relates to a method of manufacturing a power storage device module, and more particularly to a method of manufacturing a power storage device module including a pressure sensitive protection device.

  A power storage device such as a secondary battery or a capacitor is rechargeable and can be repeatedly used, and thus is widely used as a power source. Further, when a secondary battery is used as a power source of a traveling motor such as an electric vehicle or a hybrid vehicle, a large current charge, a large current discharge and a large capacity are required. A battery (battery module) is used.

  The plurality of unit cells that form the assembled battery are not all the same, and, for example, the capacity of each unit cell varies. If the assembled battery is charged and discharged as a whole, but is continuously used with variations, it may cause over-discharge or over-charge depending on the unit cell.

  Further, in a lithium ion secondary battery, when an overvoltage is applied by overcharging or the like and the potential of the positive electrode rises to the decomposition potential of the solvent of the electrolytic solution, the decomposition reaction of the solvent occurs. Since this decomposition reaction is an exothermic reaction, the temperature of the lithium ion secondary battery rises. In order to prevent such an exothermic reaction, some lithium ion secondary batteries are equipped with a current interruption device. As a current interrupting device, a device configured to cut off the electrical connection with the outside when the pressure in the battery case (battery case) rises to a threshold value and to interrupt the charging current from the outside, that is, a pressure-sensitive current interrupting device (Pressure-sensitive protection device).

  Conventionally, in consideration of the fact that high-rate deterioration due to repeated high-rate charging / discharging is unavoidable depending on the driving mode, it is possible to suppress the occurrence of variations due to high-rate deterioration of individual cells in the battery pack. Has been proposed (see Patent Document 1). The assembled battery of Patent Document 1 is arranged in a region where the temperature of the secondary battery is higher than that of the secondary battery which is arranged in a region where the temperature of the secondary battery is lower than that of the secondary battery. The amount of electrolyte in the secondary battery used is large. This assembled battery is manufactured based on the knowledge that the high rate deterioration of the unit cell progresses faster in the low temperature environment than in the high temperature environment, and also in the case where the electrolytic solution amount is large compared to the case where the electrolytic solution amount is small. .. Further, as a method of manufacturing the assembled battery, prepare secondary batteries having different amounts of electrolytic solution housed therein, and arrange the secondary batteries having a large amount of electrolytic solution in a region that becomes hotter during use, A small number of secondary batteries are arranged in a region where the temperature becomes lower when used.

JP, 2010-170942, A

  In order for the pressure-sensitive protective device to operate effectively, a certain space is required in the case (battery case), but in the manufacturing process of the unit cells that make up the assembled battery (battery module), the unit cells are configured. The inner volume of the case varies due to the variation in the volume of the electrode assembly. Therefore, if the electrolyte is injected in a state where a certain space is secured in the case (battery case), there will be variations in the amount of electrolyte in the manufactured cells, and there will be a large amount of electrolyte and A unit cell having a relatively small amount of liquid is manufactured at a predetermined ratio. Therefore, the unit cells that form the assembled battery include both the unit cells having a relatively large amount of electrolytic solution and the unit cells having a relatively small amount of electrolytic solution.

  The temperature rise of the unit cell during use of the battery pack varies depending on the arrangement position of the battery cell. For example, when forced cooling is not performed during use, the temperature tends to rise closer to the center of the battery pack in the longitudinal direction. .. Further, for example, when the cooling medium is supplied to the periphery of the assembled battery and is used in the state of being forcibly cooled, the unit cell arranged on the discharge side is more preferable than the unit cell arranged on the cooling medium supply side. , Temperature rises easily.

  The inventor of the present application has found that when the temperature during use is high, permeation of the electrolyte solution from the inside of the battery (leakage from the seal part) occurs, and when the permeation amount of the electrolyte solution exceeds a threshold value, the unit cell suddenly begins to deteriorate. It was confirmed.

  In Patent Document 1, secondary batteries having different amounts of electrolytic solution housed therein are prepared, and secondary batteries having a large amount of electrolytic solution are arranged in a region having a higher temperature when in use, and a secondary battery having a small amount of electrolytic solution is used. A method of manufacturing an assembled battery has been proposed in which the battery is arranged in a region where the temperature is lower when it is used. However, in the process of manufacturing a cell equipped with a pressure-sensitive protection device, if the electrolyte is injected into the case (battery case) with a certain space secured, the volume of the electrode assembly of the cell may fluctuate. Then, no consideration is given to the production of a unit cell having a relatively large amount of electrolytic solution and a unit cell having a relatively small amount of electrolytic solution at a predetermined ratio.

  The present invention has been made in view of the above problems, and an object thereof is a power storage device module including a plurality of power storage devices including a pressure-sensitive protection device, in which the power storage device rapidly deteriorates during use. An object of the present invention is to provide a method of manufacturing a power storage device module that can prevent the occurrence of the above phenomenon.

  A method of manufacturing a power storage device module that solves the above problem is a method of manufacturing a power storage device module in which a plurality of power storage devices including a pressure-sensitive protection device are combined. Then, when the power storage device module is used, a power storage device having a large amount of electrolytic solution among the power storage devices manufactured in the power storage device manufacturing step is arranged in a region having a relatively high temperature in the power storage device module, A power storage device module is manufactured. According to this structure, even if the amount of the electrolytic solution of each power storage device including the pressure-sensitive protection device that constitutes the power storage device module varies, the power storage device having a relatively large amount of the electrolytic solution can be used as the power storage device module. It is placed in an area that is sometimes hot. As a result, even when the electrolyte solution permeates through the power storage device arranged in a region where the temperature of the power storage device module is high during use, it is difficult to reduce the amount of the electrolyte solution to an amount that causes rapid deterioration of the power storage device. Therefore, in a power storage device module including a plurality of power storage devices including a pressure-sensitive protection device, it is possible to prevent abrupt deterioration of the power storage device during use.

  After arranging the electrode assembly in the battery case of the power storage device in the manufacturing process of the power storage device, the volume of the battery container is measured, and the electrolytic solution is injected so that the empty space becomes constant according to the volume of the battery container. Preferably. According to this configuration, it is possible to accurately and easily check the amount of the electrolytic solution in each power storage device manufactured in the power storage device manufacturing process, and to use the power storage device manufactured in the power storage device manufacturing process as a power storage device module. In the manufacturing process, it becomes easy to arrange the power storage device module at an appropriate position.

  It is preferable that the stock of the power storage devices manufactured in the power storage device manufacturing process is divided into a plurality of ranks according to the amount of the electrolytic solution, and the stock is allocated from the power storage devices of each rank according to the arrangement position of the power storage devices in the power storage device module. The variation in the amount of the electrolytic solution in the power storage device manufactured in the power storage device manufacturing process becomes closer to the normal distribution as the number of power storage devices increases. Therefore, when the power storage device manufactured in the power storage device manufacturing process is divided into a plurality of ranks according to the amount of the electrolytic solution and temporarily stored, when the power storage device module is assembled, a plurality of different preset electrolyte amounts that configure the power storage device module are used. The power storage device module can be assembled in the state where the power storage device exists.

  According to the present invention, in a power storage device module including a plurality of power storage devices including a pressure-sensitive protection device, it is possible to prevent abrupt deterioration of the power storage device during use.

(A) is a schematic perspective view of a secondary battery module, (b) is a schematic perspective view in which a secondary battery of the secondary battery module is partially broken. The schematic diagram which shows the arrangement | positioning of the secondary battery of a secondary battery module. FIG. 3 is a schematic diagram illustrating a method of manufacturing the secondary battery module according to the first embodiment. (A) is a schematic diagram explaining the manufacturing method of the secondary battery module of 2nd Embodiment, (b) is a figure explaining the state which the secondary batteries with a near electrolytic solution amount do not adjoin. The schematic diagram explaining the manufacturing method of the secondary battery module of 3rd Embodiment.

(First embodiment)
Hereinafter, a first embodiment in which the present invention is embodied when a secondary battery (lithium ion secondary battery) as a power storage device is used will be described with reference to FIGS. 1 to 3.

  As shown in FIG. 1A, a secondary battery module 100 as a power storage device module is configured by arranging a plurality of secondary batteries 10 as power storage devices in parallel. In FIG. 1A, the secondary batteries 10 arranged in a state of overlapping in the thickness direction of the adjacent secondary batteries 10 are arranged in one row.

  As shown in FIG. 1B, the secondary battery 10 includes a case 11 as a flat rectangular box-shaped battery case. The case 11 has a rectangular box-shaped case body 12 having an opening, and a flat plate-shaped lid 13 that closes the opening of the case body 12. The case body 12 and the lid 13 are made of metal (for example, aluminum). The case body 12 and the lid 13 are welded.

  As shown in FIG. 1B, the secondary battery 10 includes a rectangular parallelepiped electrode assembly 14 housed in the case 11 and an electrolytic solution (not shown) housed in the case 11. The electrode assembly 14 is configured by alternately stacking positive electrodes and negative electrodes with a separator interposed therebetween. The positive electrode and the negative electrode are insulated by a separator.

  As shown in FIGS. 1A and 1B, the secondary battery 10 has a positive electrode terminal 15 and a negative electrode terminal 16. Each of the positive electrode terminal 15 and the negative electrode terminal 16 has a shaft portion, and a part of the shaft portion penetrates the lid 13 from the inside of the case 11 to the outside and is fixed to the lid 13 by a nut 17 screwed to the shaft portion. ing.

  As shown in FIG. 1A, the plurality of secondary batteries 10 are arranged such that the positive electrode terminals 15 are connected to the negative electrode terminals 16 of the adjacent secondary batteries 10 and the negative electrode terminals 16 are connected to the positive electrode terminals 15 of the adjacent secondary batteries 10, respectively. It is connected via the bus bar 20 and the bolt 21, and is electrically connected in series. The bolt 21 penetrates the bus bar 20 and is screwed into a screw hole (not shown) formed in the positive electrode terminal 15 to tighten and fix the bus bar 20 and the positive electrode terminal 15. As a result, the bus bar 20 and the positive electrode terminal 15 are connected to each other and electrically connected. In addition, the bolt 21 is screwed into a screw hole (not shown) formed in the negative electrode terminal 16 in a state of penetrating the bus bar 20, thereby fastening and fixing the bus bar 20 and the negative electrode terminal 16. As a result, the bus bar 20 and the negative electrode terminal 16 are connected to each other and electrically connected.

  Each of the secondary batteries 10 constituting the secondary battery module 100 is integrally movably housed in a case (not shown) or fixed by a support frame (not shown). In addition, the number of the secondary batteries 10 configuring the secondary battery module 100 is set according to the output voltage required by the secondary battery module 100.

  In the case 11 of the secondary battery 10, a current interrupting device 30 (so-called CID) as a pressure-sensitive protection device is provided on the inner surface of the lid 13 in the case 11. The current interrupt device 30 is integrated under the negative electrode terminal 16. When the pressure inside the case 11 exceeds a threshold value, the current interrupting device 30 interrupts the current by disconnecting the energizing passage that electrically connects the electrode assembly 14 and the negative electrode terminal 16. The threshold value of the current cutoff device 30 is set lower than the opening pressure of a pressure release valve (not shown). The pressure release valve operates by the gas generated in the case 11 to open the pressure in the case 11 to the outside of the case 11 so that the pressure in the case 11 does not rise too much. The opening pressure of the pressure release valve is set to a pressure at which the pressure inside the case 11 can be released before the case 11 itself or the joint between the case body 12 and the lid 13 is cracked or broken.

  When the secondary battery module 100 is used, the plurality of secondary batteries 10 constituting the secondary battery module 100 have a large amount of electrolytic solution in a region of relatively high temperature in the secondary battery module 100. Ten are arranged. In this embodiment, the amount of the electrolytic solution of the secondary battery 10 used for the assembly in the secondary battery module assembling step is classified into four ranks in the descending order of large, special, large, average, and small.

  The ranking is set according to the frequency of occurrence and the number of uses. The frequency of occurrence corresponds to the fact that the proportion of the amount of the electrolytic solution changes depending on the manufacturing time of the secondary battery 10. Further, the number of uses corresponds to what kind of electrolyte solution of the secondary battery 10 is used and at what ratio in the manufacturing process of the secondary battery module 100.

  As shown in FIG. 2, the secondary battery module 100 is configured by arranging an odd number of secondary batteries 10 in one row, and the center of the secondary battery module 100 is the one of the “special” ranks in which the electrolyte solution amount is the largest among the four levels. The secondary battery 10 is arranged, and the secondary battery 10 of the "high" rank having the second largest amount of electrolyte is arranged on both sides of the secondary battery 10 of the "special" rank. The secondary battery 10 of the “normal” rank is arranged outside the secondary battery 10 of the “high” rank with the third largest amount of electrolyte, and is placed outside the secondary battery of the “normal” rank. Is the secondary battery 10 of the rank "small" having the smallest amount of electrolyte.

Next, a method for manufacturing the secondary battery module 100 configured as described above will be described.
The manufacturing method of the secondary battery module 100 is roughly divided into a secondary battery manufacturing process for manufacturing the secondary battery 10 and a secondary battery module 100 using the secondary battery 10 manufactured in the secondary battery manufacturing process. And a secondary battery module manufacturing process for assembling.

  The manufacturing method of the secondary battery 10 in the secondary battery manufacturing step is an electrode assembly for manufacturing a laminated electrode assembly 14 in which a rectangular sheet-shaped positive electrode and a rectangular sheet-shaped negative electrode are laminated in a state in which a separator is present therebetween. A three-dimensional manufacturing process and a housing process for housing the electrode assembly 14 manufactured in the electrode assembly manufacturing process in the case 11. After the electrode assembly 14 is housed in the case body 12 in the housing process, the opening of the case body 12 is closed by the lid 13 in the closing process. The lid 13 is fixed to the case body 12 by welding, for example. Next, the electrolytic solution is injected into the case 11 in which the electrode assembly 14 is housed and arranged in the electrolytic solution injection step.

  In the electrolytic solution injecting step, after disposing the electrode assembly 14 in the case 11, the internal volume of the case 11 is measured and the electrolytic solution is injected so that the empty space becomes constant according to the internal volume of the case 11. .. That is, after the electrode assembly 14 is placed in the battery case (case 11) of the power storage device (secondary battery 10) in the power storage device manufacturing process, the internal volume of the battery cell is measured, and an empty space is determined according to the internal volume of the battery cell. The electrolyte is injected so that the temperature is constant. In addition, the volume of the battery case is measured by, for example, depressurizing the case 11 before charging the electrolytic solution, and then charging a gas, and determining the size of the space in the case from the amount of the gas, that is, the capacity of the battery case. To detect.

  The manufacturing number is given to the secondary battery 10 after the injection of the electrolytic solution, that is, the injection is performed, and the amount of the electrolytic solution of each secondary battery 10 is stored in the management device together with the manufacturing number. After the injection of the electrolytic solution is completed, the secondary battery 10 undergoes processes such as initial charging and aging, and the secondary battery 10 having no abnormality is managed as an in-process inventory by controlling the amount of the electrolytic solution of each secondary battery 10 together with the manufacturing number. Stored in the device.

Further, as shown in FIG. 3, the secondary battery 10 is temporarily stored in, for example, the storage section 40 until it is used for assembling the secondary battery module 100 in the secondary battery module manufacturing process.
The variation in the amount of the electrolytic solution of the secondary battery 10 manufactured in the previous process of the secondary battery module manufacturing process is in a state close to a normal distribution. Therefore, even if the secondary battery 10 is not sorted in advance according to the amount of the electrolytic solution and stored in the storage section 40, if the secondary battery 10 is in stock, it is necessary in the assembly process of the secondary battery module 100. The secondary battery 10 having a large amount of electrolyte is present. In addition, in this embodiment, the secondary battery 10 is ranked into four ranks according to the amount of the electrolytic solution, and "special": "large": "normal": "small" = 1: 2: 2: 2. The liquid amount of each rank is set so that

  The secondary battery 10 that is temporarily stored in the storage unit 40 is not stored in a state in which the secondary battery 10 is classified according to the rank of the electrolyte solution. However, for each secondary battery 10, the rank of the electrolyte solution amount is stored in the management device. Then, the secondary batteries 10 stored in the storage unit 40 are ranked into “special”, “many”, “average”, and “small” when the secondary battery module 100 is assembled, and the secondary batteries 10 are ranked. The secondary battery 10 is arranged at a predetermined rank position of the secondary battery module 100.

  Then, for example, when the number of the secondary batteries 10 constituting the secondary battery module 100 is 7, as shown in FIG. 2, the secondary battery of the “special” rank, which has the largest amount of electrolytic solution among the four stages, is used. 10 is arranged in the center, and the secondary battery 10 of the "high" rank having the second largest amount of electrolyte is arranged on both sides of the secondary battery 10 of the "special" rank. The secondary battery 10 having a rank of "normal" with the third largest amount of electrolyte is arranged outside the battery 10. Then, the secondary battery 10 of the "small" rank having the smallest amount of electrolytic solution is arranged outside the secondary battery of the "normal" rank.

  The secondary battery module 100 configured as described above is configured such that even if the amount of the electrolytic solution of each of the secondary batteries 10 including the current cutoff device 30 that configures the secondary battery module 100 varies, the electrolytic solution is relatively discharged. A large amount of secondary battery 10 is arranged in a region where the secondary battery module 100 has a high temperature when it is used. As a result, even if the electrolytic solution of the secondary battery 10 arranged in a region where the secondary battery module 100 has a high temperature during use is permeated, the amount of the electrolytic solution is reduced to an amount that causes rapid deterioration of the secondary battery 10. Hard to do.

According to this embodiment, the following effects can be obtained.
(1) The method of manufacturing the secondary battery module 100 (power storage device module) is a method of manufacturing a secondary battery module 100 in which a plurality of secondary batteries 10 (power storage devices) each including a current cutoff device 30 (pressure sensitive protection device) are combined. It is a manufacturing method. Then, when the secondary battery module 100 is used, a secondary battery having a large amount of electrolytic solution among the secondary batteries 10 manufactured in the power storage device manufacturing process is provided in a region having a relatively high temperature in the secondary battery module 100. 10 is arranged and the secondary battery module 100 is manufactured. Therefore, in the secondary battery module 100 including the plurality of secondary batteries 10 including the current cutoff device 30, it is possible to prevent abrupt deterioration of the secondary battery 10 during use.

  (2) In the secondary battery manufacturing process (power storage device manufacturing process), after disposing the electrode assembly 14 in the case 11 (battery case) of the secondary battery 10, the internal volume of the case 11 is measured to determine the contents of the case 11. The electrolyte is injected so that the empty space becomes constant according to the product. Therefore, the amount of the electrolyte solution for each secondary battery 10 is ensured in each secondary battery 10 in a state in which the internal space required for the pressure-sensitive current interrupt device 30 (pressure-sensitive protection device) to operate without trouble is secured. Therefore, each secondary battery 10 forming the secondary battery module 100 can be arranged at an appropriate position.

  (3) Each of the secondary batteries 10 manufactured in the secondary battery manufacturing process (power storage device manufacturing process) is temporarily stored in the storage unit 40 in a state in which the manufacturing number and the rank of the electrolyte solution are stored in the management device. Stored as. Therefore, when the secondary battery module 100 is manufactured, each secondary battery 10 is installed in a predetermined rank position of the secondary battery module 100 without having to set a predetermined storage place for each rank in a state in which the storage battery is divided into ranks. Can be placed at.

(Second embodiment)
Next, a second embodiment will be described with reference to FIGS. 4 (a) and 4 (b).
In this embodiment, the inventory of the secondary battery 10 (power storage device) manufactured in the secondary battery manufacturing process (power storage device manufacturing process) is divided into a plurality of ranks according to the amount of the electrolytic solution and stored in the storage section 40. This is different from the first embodiment. The same parts as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

  As shown in FIG. 4 (a), the storage section 40 includes the secondary batteries 10 manufactured in the previous step and measured for the amount of the electrolytic solution, in the order of increasing amount of the electrolytic solution: special, large, average, and small. It is provided with four storage units 41, 42, 43, and 44 which are classified into stages and stored. Further, each storage unit 41, 42, 43, 44 is composed of two storage sections 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b, which are respectively partitioned vertically. Even if the secondary battery 10 has the same rank, the secondary battery 10 is divided into those having a large amount of electrolyte solution and those having a small amount of electrolyte solution and stored. In this embodiment, the secondary battery 10 having a large amount of electrolyte is stored in the storage compartments 41a to 44a, and the small secondary battery 10 is stored in the storage compartments 41b to 44b. The secondary battery 10 is stored in each of the storage compartments 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b so that the secondary batteries 10 can be taken out in the order of oldest manufacturing date.

  In this embodiment, when the secondary battery module 100 is assembled in the secondary battery module manufacturing process, the oldest secondary battery 10 in stock is allocated first. For example, when the oldest secondary battery 10 is stored in the upper storage compartment 41a of the "small" rank storage unit 41, the "small" secondary battery 10 is taken out from the storage compartment 41a. used. Since two secondary batteries 10 of “small” rank are required, two secondary batteries 10 are taken out from the storage compartment 41a and placed in the outermost position of the secondary battery module 100.

  The secondary batteries 10 of ranks other than "low" are stored in the upper storage compartments 42a, 43a, 44a corresponding to the storage compartment 41a from which the secondary battery 10 of "low" rank is taken out. The secondary battery 10 is used. Therefore, as shown in FIG. 4 (a), two secondary batteries 10 of “rank” rank are taken out from the storage section 42 a and placed at a position inside the “small” rank of the secondary battery module 100. The two secondary batteries 10 having the “many” rank are taken out from the storage section 43a, and are placed inside the “many” rank of the secondary battery module 100. Then, one secondary battery 10 of “special” rank is taken out from the storage section 44a and placed in the center position of the secondary battery module 100.

  In addition, when the oldest secondary battery 10 is stored in the storage compartment 41b below the storage unit 41 having the "low" rank, the secondary batteries 10 having the ranks other than "low" are "low". The secondary battery 10 stored in each of the lower storage compartments 42b, 43b, 44b corresponding to the storage compartment 41b from which the secondary battery 10 of the rank has been taken out is used.

  In order to assemble the secondary battery module 100, when each secondary battery 10 is taken out from each storage unit 41 to 44, for example, when the secondary battery 10 is taken out from the storage section 41a of the storage unit 41, another storage unit 42 is obtained. To 44, the secondary batteries 10 are taken out from the storage compartments 42a to 44a corresponding to the storage compartment 41a, respectively. When the secondary battery 10 is taken out from the storage compartment 41b of the storage unit 41, the secondary battery 10 is taken out of the other storage sections 42 to 44 from the storage compartments 42b to 44b corresponding to the storage compartment 41b.

  As shown in FIG. 4B, the combination of the secondary batteries 10 taken out from each of the storage units 41 to 44 is illustrated in association with the variation in the amount of the electrolytic solution of the secondary batteries 10, and the secondary batteries 10 are stored. When it is taken out from the sections 41a to 44a, it becomes an upper row indicated by a circle in FIG. When the secondary batteries 10 are taken out from the storage compartments 41b to 44b, the lower row shown by circles in FIG. In FIG. 4 (b), the two-dot chain line indicates the boundary of the amount of electrolyte in each storage unit 41 to 44.

  The secondary battery 10 configuring one secondary battery module 100 is taken out from the storage compartments 41a to 44a having a large amount of electrolyte solution in each storage section 41 to 44, or from the storage compartments 41b to 44b having a small amount of electrolyte solution. When it is taken out, the combination of the secondary batteries 10 is in a state in which the circles in the upper row and the circles in the lower row in FIG. 4B are mixed. As a result, there is a case where the difference in the amount of electrolytic solution between the adjacent secondary batteries 10 forming the secondary battery module 100 is close to each other, and it may not be possible to make a significant difference in the amount of electrolytic solution between the adjacent secondary batteries 10. is there.

  However, in this embodiment, the secondary battery 10 which constitutes one secondary battery module 100 is taken out only from the storage compartments 41a to 44a having a large amount of electrolyte in each of the storage portions 41 to 44, or the secondary batteries 10 are electrolyzed. Since the secondary batteries 10 are taken out only from the storage compartments 41b to 44b having a small amount of liquid, the combination of the secondary batteries 10 is the row of the upper circles or the row of the lower circles in FIG. 4B. As a result, it is easy to make a significant difference in the amount of the electrolytic solution between the adjacent secondary batteries 10 forming the secondary battery module 100.

In this embodiment, the same effects as (1) and (2) of the first embodiment are obtained, and the following effects are obtained.
(4) The storage unit 40 stores the secondary battery 10 manufactured in the previous step and having the measured amount of the electrolytic solution in four stages of extra, large, average, and small in the order of the large amount of the electrolytic solution. 4 storage units 41, 42, 43, 44 are provided. Then, the secondary battery 10 for which the amount of electrolytic solution has been measured is stored in the storage units 41, 42, 43, 44 having ranks corresponding to the amount of electrolytic solution. Therefore, unlike the above-described embodiment, in order to take out the secondary battery 10 of the rank of the electrolytic solution amount required for assembling the secondary battery module 100 in the secondary battery module manufacturing process from the secondary battery 10 stored in the storage unit 40. In addition, it is not necessary to manage the amount of electrolytic solution of each secondary battery 10 with the management device.

  (5) The storage unit 41 and the like for storing the secondary battery 10 by ranking it according to the amount of the electrolyte solution is composed of two storage compartments 41a, 41b and the like, which are divided into upper and lower portions, respectively. Even if the ranks are the same, the ranks are sorted into those having a large amount of electrolyte solution and those having a small amount of electrolyte solution. When taking out the secondary battery 10 of the rank of the amount of electrolyte required for assembling the secondary battery module 100 from the secondary battery 10 stored in the storage section 40, for example, the secondary battery 10 in the upper storage section 41a is “ When the secondary battery 10 of the “low” rank is first taken out, the secondary battery 10 such as the storage compartment 42a above the secondary batteries 10 of all the other ranks is used. Therefore, it is easy to make a significant difference in the amount of the electrolytic solution between the adjacent secondary batteries 10 constituting the secondary battery module 100.

  (6) When the secondary battery 10 is taken out from each storage compartment 41a, 41b to 44a, 44b of the storage section 40, the oldest secondary battery 10 is taken out first, and the secondary batteries 10 in other storage compartments are also taken out first. The secondary battery 10 is taken out from the storage compartment on the same side. Therefore, there is no possibility that the old secondary battery 10 will not be used forever and will remain in the storage section 40.

(Third Embodiment)
Next, a third embodiment will be described with reference to FIG. In this embodiment, the number of secondary batteries 10 (power storage device) manufactured in the secondary battery manufacturing process (power storage device manufacturing process) is larger than the number of sets required for one assembly in the secondary battery module manufacturing process. After storing the stock in the storage unit 40, the secondary battery 10 for one module is sent from the previous process rather than being supplied to the secondary battery module manufacturing process. In this state, as shown on the left side of FIG. 5, there is no particular regularity in the amount of the electrolytic solution of the secondary battery 10. Next, as shown in the right side of FIG. 5, the secondary batteries 10 for one module are rearranged in order of the liquid amount in the module assembling process. Then, in that state, the secondary battery 10 for one module is supplied to the module assembly process.

  Therefore, in this embodiment, the secondary battery 10 for one module may be sequentially supplied to the module manufacturing process in a state corresponding to the amount of the electrolytic solution each time. A storage unit for storing 10 is unnecessary. However, in some cases, due to variations in the amount of electrolyte solution in the secondary batteries 10 manufactured in the previous step, it becomes impossible to make a significant difference in the amount of electrolyte solution in adjacent secondary batteries 10.

The embodiment is not limited to the above, and may be embodied as follows, for example.
The secondary battery module 100 (power storage device module) has an amount of electrolyte solution in the secondary battery 10 (power storage device) manufactured in the power storage device manufacturing process in a region where the temperature is relatively high in the secondary battery module 100. The secondary battery module 100 may be manufactured by arranging the secondary batteries 10 having a large number of electrolytes.

  As in the second embodiment, the stock of the secondary battery 10 manufactured in the power storage device manufacturing process is divided into a plurality of ranks according to the amount of the electrolytic solution, and the secondary batteries 10 to the secondary batteries in the secondary battery module 100 of each rank. When allocating the inventory according to the arrangement position of the battery 10, the storage units 41 to 44 corresponding to the four stages of the amount of the electrolytic solution, that is, special, large, ordinary, and small, may not be divided into two, but may be divided into one.

  In the second embodiment, the secondary battery 10 is taken out from the storage compartments 41a, 41b to 44a, 44b of each of the storage sections 41 to 44 regardless of how old the secondary battery 10 is. ~ 44a and the lower storage compartments 41b to 44b may be taken out alternately.

  The number of the secondary batteries 10 constituting the secondary battery module 100 is not limited to seven described in each of the above embodiments, and may be appropriately set depending on the output voltage and the capacity required for the secondary battery module 100.

The secondary battery module 100 is not limited to the configuration in which the plurality of secondary batteries 10 are connected in series, but may be configured to be connected in parallel.
In the secondary battery module 100, the plurality of secondary batteries 10 are connected in a plurality of columns, the secondary batteries 10 in each column are connected in series, and the columns of the secondary batteries 10 connected in series are connected in parallel. May be.

  The position where the temperature of the secondary battery module 100 becomes high during use varies depending on the usage conditions of the secondary battery module 100. When the secondary battery module 100 is not forcibly cooled, the central part becomes hot, but when it is forcibly cooled. Becomes high temperature on the downstream side in the moving direction of the refrigerant used for forced cooling.

  In the first embodiment, instead of providing the storage section 40 and storing the secondary battery 10 manufactured in the previous step in the storage section 40 as an inventory, the secondary battery 10 exists in the previous step such as the initial charging step and the aging step. The secondary battery 10 may be treated as an inventory, and the secondary battery 10 that has completed the previous process may be supplied to the secondary battery module manufacturing process without passing through the storage section 40.

  In the third embodiment, the rechargeable battery 10 for one module supplied from the previous step may be the rechargeable battery 10 whose initial charging is completed and before aging is completed. However, since there are secondary batteries 10 that become defective during aging, the secondary battery 10 after completion of aging is preferable.

  The pressure-sensitive protection device, for example, like the device disclosed in Japanese Patent No. 5395013, short-circuits the positive electrode terminal and the negative electrode terminal when the pressure in the case exceeds a threshold value, and thus the terminal and the electrode assembly are connected. The device may be configured so that the electrical connection thereof is cut off.

  ○ If the power storage device (secondary battery) does not have a current cutoff device but has a pressure release valve that releases the pressure inside the case to the outside of the case, the pressure release valve corresponds to a pressure-sensitive protective device. ..

  ○ The secondary battery as a power storage device is not limited to a lithium-ion secondary battery, but may be any secondary battery that uses an electrolytic solution, such as a nickel-hydrogen secondary battery, a nickel-cadmium secondary battery, or a lead battery. It may be a secondary battery.

  The power storage device is not limited to the secondary battery, and may be a capacitor such as an electric double layer capacitor or a lithium ion capacitor.

  10 ... Secondary battery as power storage device, 11 ... Case as battery case, 14 ... Electrode assembly, 30 ... Current interruption device as pressure sensitive protection device, 100 ... Secondary battery module as power storage device module.

Claims (2)

A method for manufacturing a power storage device module, which is a combination of a plurality of power storage devices including a pressure-sensitive protection device, comprising:
After the electrode assembly is placed in the battery case of the power storage device in the manufacturing process of the power storage device, the volume of the battery container is measured, and the electrolytic solution is injected so that the empty space becomes constant according to the volume of the battery container. ,
In use of the power storage module, a region to be a relatively high temperature in said electric storage device module, by disposing the power storage device electrolyte volume is large among the prepared electricity storage device manufacturing process the electric storage device, electric storage A method of manufacturing a power storage device module, which comprises manufacturing a device module. Divided into a plurality ranks the stock of the electric storage device power storage device manufactured in the manufacturing process by the electrolyte volume, according to claim 1, Hikiateru inventory in accordance with the position of the power storage device in the power storage device module from the storage device of each rank A method for manufacturing a power storage device module.