JP2013055070A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a battery pack in which square batteries are stacked to be fixed in ideal conditions, and to prevent deterioration of battery performance in use.SOLUTION: The battery pack is characterized by including: a battery block 3 containing a plurality of square batteries stacked in one direction; a pair of end plates 5, 25, 45 arranged on both end surfaces of the battery block 3 in stacking direction; metal bands 6, 26, 46 connecting to the pair of end plates 5, 25, 45; and a rivet for fixing the metal bands 6, 26, 46 with the pair of end plates 5, 25, 45, where the metal plate 6, 26, 46 are fixed on outside surfaces of the end plates 5, 25, 45 via the rivet while including bent parts formed at both ends thereof, the bent parts having through holes 17 into which the rivets are inserted, and the battery block 3 is fixed in a compression state via the metal bands 6, 26, 46.

Description

  The present invention relates to a battery pack used for an in-vehicle power supply device and the like, and a battery pack separator used therefor.

As shown in FIG. 1, the assembled battery in which a plurality of prismatic batteries are stacked has a pair of end plates 905 connected by bolts 906, and the stacked batteries 901 are disposed between the end plates 905. (See Patent Document 1)
As shown in FIG. 1, the assembled battery of Patent Document 1 is provided with ear-shaped protrusions 908 through which the bolts 906 are inserted on both sides of the end plate 905 in order to connect the bolts 906. The bolt 906 is inserted into the ear-shaped protrusion 908, and a nut 907 is screwed into the tip to fix the end plate 905. The assembled battery having this structure has a drawback that the performance of the battery is lowered depending on the state of use. In particular, the assembled battery having this structure has a drawback that the internal resistance of the battery is increased depending on the use state of the battery and the output is lowered because a lithium ion secondary battery is used for the prismatic battery. This is because the ear-shaped protrusions are easily deformed and cannot reliably prevent the battery outer can from expanding. In a lithium ion secondary battery, the electrodes expand during normal charging / discharging or overcharging, and the interval between the positive and negative electrodes is widened. In this state, the moving distance of ions moving between the positive and negative electrodes becomes long, and the internal resistance increases. In particular, lithium ion secondary batteries have a larger internal resistance with respect to the opposing area of the electrodes compared to nickel cadmium batteries, etc. Therefore, in order to reduce the internal resistance, the positive and negative electrode plates are thinned to reduce the electrode spacing. The facing area is increased. That is, since the internal resistance is reduced by narrowing the interval between the positive and negative electrodes, the internal resistance increases even if the electrodes expand and the electrode interval slightly increases. As the internal resistance of the battery increases, the maximum current that can be taken out decreases and the output power also decreases. An assembled battery in which a large number of prismatic batteries are stacked is used for a vehicle or the like that requires a high output.

  Further, the assembled battery of FIG. 1 has a problem that the bolt 906 contacts the side surface of the square battery 901 when the square battery 901 expands. This is because when the square battery 901 expands and the ear-shaped protrusion 908 bends inward, the bolt 906 inserted through the ear-shaped protrusion 908 is curved inward. The stacked square batteries have a potential difference between the adjacent outer cans. For this reason, when a bolt contacts the outer can of a plurality of rectangular batteries, a short-circuit current flows to cause harmful effects on the battery and also reduce safety.

Instead of bolts, battery packs have been developed that fix batteries to be stacked with metal bands. (See Patent Documents 2 and 3)
Patent Document 2 describes an assembled battery in which metal bars are provided on both sides of a rectangular battery to be stacked, and both ends of a metal band are fixed to the metal bar with set screws. In the assembled battery having this structure, the square battery is easily expanded and the metal bar is easily deformed, and it is difficult to reliably prevent the expansion of the square battery and to prevent the battery performance from being deteriorated. Further, Patent Document 3 describes an assembled battery in which a pair of end plates are provided on both sides of a rectangular battery to be stacked, and a metal bar is welded to the end plates and fixed. Since this assembled battery is fixed by welding a metal bar, it has a drawback that it is difficult to adjust and fix the prismatic battery in an accurate compressed state.

Japanese Utility Model Publication No. 3-32364 JP-A-5-343105 Special table 2001-507856 gazette

  The present invention has been developed for the purpose of solving the above-mentioned drawbacks. An important object of the present invention is to provide an assembled battery in which stacked prismatic batteries are fixed in an ideal state, and deterioration of battery performance in use can be prevented.

  A battery block including a plurality of prismatic batteries stacked in one direction; a pair of end plates disposed on both end surfaces in the stacking direction of the battery block; a metal band connected to the pair of end plates; A metal band and a rivet for fixing the pair of end plates, and the metal band includes bent portions formed at both ends and having through holes through which the rivet is inserted, and through the rivet, The battery block is fixed to an outer surface of a pair of end plates, and the battery block is fixed in a compressed state via the metal band.

  Furthermore, it is preferable that the pair of end plates include a positioning fitting portion that positions the metal band at a fixed position.

  Further, the pair of end plates have a fixing hole through which the rivet is inserted, and the metal band is positioned at a position where the through hole and the fixing hole are aligned via the positioning fitting portion. It is preferable.

  Furthermore, it is preferable that the positioning fitting portion includes a protrusion formed on the pair of end plates and restricting movement in a direction perpendicular to the extending direction of the metal band.

  Furthermore, it is preferable that the bent portion of the metal band is locked to the pair of end plates.

  Furthermore, it is preferable that the pair of end plates include a metal member, and the metal member is stacked on the square battery positioned at both ends of the battery block via a stacked material.

  The assembled battery of the present invention is characterized in that the prismatic battery to be stacked can be fixed in an ideal state to prevent a decrease in battery performance in the use state. That is, the assembled battery of the present invention has a pair of end plates arranged on both end faces of the stacked square batteries, and a bent battery at the tip is connected to the end plates to form a stacked square battery. This is because the rectangular battery to be stacked is fixed by a fixed component including a metal band fixed in a compressed state. In this state, the rectangular battery fixed in the stacked state is prevented from expanding by the end plates on both sides. As a result, the electrode expands to increase the internal resistance, thereby eliminating the disadvantage that the output is reduced.

  In particular, a bent portion that is bent toward the surface of the end plate is provided at the end portion of the metal band, and the bent portion is fixed to the outer surface of the end plate. The assembled battery having this structure does not need to be provided with protruding ears on both sides of the prismatic battery as in the conventional assembled battery in order to connect the metal bands. It is possible to reliably prevent the battery from expanding or short-circuiting when the metal band comes into contact with the square battery of the square battery.

It is a top view of the conventional assembled battery. It is a perspective view of a power supply device provided with the assembled battery concerning one Example of this invention. It is a top view of the power supply device shown in FIG. It is a perspective view of the assembled battery of Example 1 of this invention. It is a perspective view of the assembled battery of Example 2 of this invention. It is a perspective view which shows the assembly process of the assembled battery shown in FIG. It is a perspective view of the assembled battery of Example 3 of this invention. It is a perspective view which shows the assembly process of the assembled battery shown in FIG. It is a perspective view which shows the assembly process of the assembled battery shown in FIG. It is a perspective view of the assembled battery of Example 4 of this invention. It is a perspective view of the assembled battery of Example 5 of this invention. It is a disassembled perspective view which shows the assembly process of the assembled battery shown in FIG. It is a perspective view of the assembled battery of Example 6 of this invention. FIG. 14 is a rear perspective view of the assembled battery shown in FIG. 13. It is a perspective view which shows the assembly process of the assembled battery shown in FIG. It is a perspective view of the assembled battery of Example 7 of this invention. It is a perspective view of the assembled battery of Example 8 of this invention. The assembled battery shown in FIG. It is a perspective view of the assembled battery of Example 9 of this invention. It is a perspective view which shows the assembly process of the assembled battery shown in FIG. It is a perspective view of the assembled battery of Example 10 of this invention. It is a perspective view which shows the assembly process of the assembled battery shown in FIG. It is a back perspective view which shows the assembly process of the assembled battery shown in FIG. It is a perspective view which shows the fixing component of the assembled battery shown in FIG. FIG. 25 is a rear perspective view of the fixed component shown in FIG. 24. It is a perspective view of the battery cell which is a square battery.

  Embodiments of the present invention will be described below with reference to the drawings. However, the example shown below illustrates the assembled battery for embodying the technical idea of the present invention, and the present invention does not specify the assembled battery as follows. Further, this specification does not limit the members shown in the claims to the members of the embodiments.

  Although the battery pack of the present invention does not specify a use, it is mainly mounted on an electric vehicle such as a hybrid car or an electric vehicle, and is used as a power supply device that supplies electric power to a vehicle running motor to run the vehicle. Is suitable.

  2 to 4 are views showing an assembled battery according to an embodiment of the present invention. 2 and 3 show a power supply device for a vehicle provided with four sets of assembled batteries, and FIG. 4 shows a perspective view of the assembled battery incorporated in these power supply devices. 5 to 25 show an assembled battery according to another embodiment. However, FIGS. 5 to 25 do not show a safety valve provided in the prismatic battery in order to simplify the drawing.

  The assembled battery shown in these figures includes a battery block 3 in which the battery cells 1 made up of a plurality of prismatic batteries are stacked, and fixing parts 4, 24, 34, 44 for fixing the battery cells 1 of the battery block 3. 54, 64, 74, 84, 94, 104.

The square battery of the battery cell 1 is a lithium ion secondary battery. However, the prismatic battery is not specified as a lithium ion secondary battery, and any battery that can be charged, such as a nickel metal hydride battery, can also be used. A square battery is a battery in which an electrode body in which positive and negative electrode plates are stacked is housed in a case and filled with an electrolytic solution. As shown in FIG. 26, the case closes the opening of the outer can 1 </ b> A formed in a rectangular tube shape that closes the bottom with a sealing plate 1 </ b> B. The outer can 1A is manufactured by deep drawing a metal plate such as aluminum or aluminum alloy. The case of the stacked rectangular battery is formed into a thin rectangular shape. The sealing plate 1B is also made of a metal plate such as aluminum or aluminum alloy. The sealing plate 1B has positive and negative electrode terminals 10 fixed to both ends via an insulating material. The positive and negative electrode terminals 10 are connected to built-in positive and negative electrode plates. The lithium ion secondary battery does not connect the outer can 1A made of a metal plate to an electrode through a lead wire. However, since the outer can 1A is connected to the electrode through the electrolytic solution, it becomes an intermediate potential between the positive and negative electrodes. However, in the square battery, one electrode terminal 10 can be connected to one electrode with a lead wire. This rectangular battery can be fixed to the sealing plate 1B without insulating the electrode terminal 10 connected to the outer can 1A. Further, the sealing plate 1B is provided with a safety valve opening 11. The safety valve opens when the internal pressure of the case becomes higher than a set value, and prevents the case from being damaged. When the safety valve is opened, the internal gas is discharged to the outside from the opening 11 of the sealing plate 1B. In the illustrated rectangular battery, the opening 11 of the safety valve is provided in the sealing plate 1B. This outer can 1A can discharge gas from the opening 11 of the safety valve to be opened. This is because gas is accumulated inside the case. The prismatic battery can also be provided with a safety valve opening at the bottom or side of the outer can. However, in this square battery, the electrolyte is discharged when the safety valve opens. The electrolytic solution is a conductive liquid, and if it is discharged, the contact portion may be short-circuited. The prismatic battery provided with a safety valve on the case sealing plate 1B can reduce the internal pressure by discharging gas from the safety valve that opens. For this reason, when the safety valve opens, the discharge of the electrolytic solution can be restricted, and the harmful effects caused by the electrolytic solution can be reduced.

  The power supply apparatus shown in FIGS. 2 and 3 is provided with a gas vent duct 12 on the assembled battery in order to exhaust the gas discharged from the safety valve to the outside. This degassing duct 12 connects the lower opening to the opening 11 of the safety valve, and exhausts the gas discharged from the safety valve to the outside. This structure can quickly exhaust the gas discharged from the prismatic battery when the safety valve is opened.

  Stacked prismatic batteries are connected in series by connecting adjacent electrode terminals 10 with a connector 13. Furthermore, a lead wire (not shown) is connected to the electrode terminal 10 of each square battery. This lead wire is connected to a circuit board (not shown) on which a protection circuit for detecting the voltage of the battery is mounted. Although not shown, the circuit board is disposed above the assembled battery in FIG.

  The battery cell 1 of the square battery has spacers 2 and 22 sandwiched therebetween. The spacers 2 and 22 insulate the adjacent cans 1 </ b> A of the square battery and provide the air duct 15 that cools the battery between the battery cells 1. Therefore, the spacers 2 and 22 are manufactured by molding an insulating material such as plastic. The spacers 2 and 22 are provided with air blowing grooves on both surfaces, and the air duct 15 is provided between the square batteries. The spacers 2 and 22 are provided with air blowing grooves so as to be connected in the horizontal direction, in other words, on both sides of the prismatic battery. The air duct 15 provided by the spacers 2 and 22 cools the prismatic battery by blowing air in the horizontal direction.

  The battery cell 1 of the square battery stacked via the spacers 2 and 22 is fixed at a fixed position by fixing parts 4, 24, 34, 44, 54, 64, 74, 84, 94, 104. The fixed parts 4, 24, 34, 44, 54, 64, 74, 84, 94, 104 are a pair of end plates 5, 25, 35, 45, 55 arranged on both end faces of the stacked rectangular batteries. , 65, 75, 85, 95, 105 and the end plates 5, 25, 35, 45, 55, 65, 75, 85, 95, 105 are connected to the ends to compress the stacked prismatic battery. It consists of metal bands 6, 26, 36, 46, 56, 66, 76, 86, 96, 106 fixed to the state.

The end plates 5, 25, 35, 45, 55, 65, 75, 85, 95, and 105 are made of metal such as aluminum or an alloy thereof, or are made by molding hard plastic. End plate 5, 25, 35, 45, 55, 65, 75, 85, 95, 1
In 05, reinforcing ribs 16 extending vertically and horizontally are integrally formed on the outer surface. The end plates 5, 25, 35, 45, 55, 65, 75, 85, 95, and 105 can increase the bending strength with the reinforcing ribs 16. The end plate having excellent bending strength can effectively prevent the central portion of the square battery from expanding. This is because the central portion of the prismatic battery does not expand unless the end plate connected to the metal band is deformed. The end plates 5, 25, 35, 45, 55, 65, 75, 85, 95, and 105 have the same outer shape as the square battery of the battery cell 1 in order to sandwich the square battery in a wide area. Yes. The square end plates 5, 25, 35, 45, 55, 65, 75, 85, 95, and 105 have the same size as the square battery or slightly larger than the square battery. Further, the end plates 5, 25, 35, 45, 55, 65, 75, 85, 95, and 105 shown in the figure are provided with a ventilation groove on the surface facing the battery cell 1, and a ventilation duct between the square battery 15 is provided. However, the end plate can also be brought into contact with the prismatic battery or the spacer in a surface contact state with the surface facing the battery cell being planar. The plastic end plate is directly laminated on the prismatic battery, and the metal end plate is laminated on the prismatic battery via a laminate material.

  The end portions of the metal bands 6, 26, 36, 46, 56, 66, 76, 86, 96, 106 are connected to the end plates 5, 25, 35, 45, 55, 65, 75, 85, 95, 105. Is done. The metal bands 6, 26, 36, 46, 56, 66, 76, 86, 96, 106 are connected to the end plates 5, 25, 45, 55, 75, 105 via the set screws 7, or the ends thereof. It is bent inward and connected to the end plates 35 and 65, or a nut 87 is screwed into the end of the metal band 86, or the end of the metal band 96 is crimped and connected to the end plates 85 and 95. . The end plates 5, 25, 45, 55, 75, and 105 that connect the metal bands 6, 26, 46, 56, 76, and 106 with the set screws 7 are provided with female screw holes 8 into which the set screws 7 are screwed. The female screw hole 8 is provided on the outer surface of the end plate 5, 25, 45, 55, 75, 105 and passes through the bent portion of the metal band 6, 26, 46, 56, 76, 106. To connect the metal bands 6, 26, 46, 56, 76, 106.

  The assembled battery in FIG. 4 includes a first metal band 6A disposed along the upper end portion of the square battery and a second metal band 6B disposed along the lower end portion of the square battery. It is linked to. This assembled battery is provided with female screw holes 8 on both sides of the outer surface at the upper and lower ends of the end plate 5. In this assembled battery, the upper and lower sides of the square battery are fixed by metal bands 6. As shown in FIGS. 5 to 24, the assembled battery has metal bands 26, 36, 46, 56, 66, 76, 86, 96, 106 arranged in the middle of the top and bottom and above and below the central portion. You can also. The end plates 25, 45, 55, 75, and 105 that fix the end portions of the metal bands 26, 46, 56, 76, and 106 with the set screws 7 have the female screw holes 8 formed in the metal bands 26, 46, 56, 76, and 106. Are provided at the connecting position.

  Like the assembled battery shown in FIGS. 7 to 9, the end plate 35 that bends and fixes the end of the metal band 36 inward does not need to be provided with a female screw hole. The end plate 35 is provided with a position fitting part 9 for connecting the end of the metal band 36 to a fixed position on the side surface. The positioning fitting portion 9 is provided on the side surface of the end plate 35 and is a through hole through which the metal band 36 is inserted. The metal band 36 is inserted through the through hole 35 and connected to a fixed position. The metal band 36 inserted here is connected to the end plate 35 with its end bent inward.

  Further, in the assembled battery shown in FIGS. 17 and 18, a threaded portion 86A provided at the tip of the metal band 86 is inserted into the end plate 85, and a nut 87 is screwed into the threaded portion 85A. The end plate 85 is provided with a through-hole positioning fitting portion 89 that is inserted into the metal band 86 at a fixed position, and a nut 87 is screwed into a screw portion 86A that protrudes to the outer surface of the end plate 85 to thereby attach the metal band 86. Connect to the end plate 85.

  Further, in the assembled battery of FIGS. 19 and 20, a caulking portion 96A provided at the tip of the metal band 96 is inserted into the end plate 95, and caulking is performed so as to expand the tip of the caulking portion 96A. The end plate 95 is connected. The end plate 95 is provided with a through-hole positioning fitting portion 99 that is inserted in a fixed position through the metal band 96, and the end portion of the metal band 96 is formed by caulking a caulking portion 96A that protrudes to the outer surface. Connect to plate 95.

  End plates 25, 35, 45, 55, 65, 75, 85, 95, 105 are provided with positioning fitting portions 9, 29, 89, 99 on the side surfaces and metal bands 26, 36, 46, 56, 66, 76, 86, 96, 106 can be placed in place. These position fixing fitting portions 9, 29, 89, 99 are fitting grooves for fitting the metal bands 26, 56 as shown in FIGS. 5, 6, 11, and 12, or FIG. As shown in FIGS. 10 to 13 and FIGS. 13 to 25, the metal bands 26, 36, 46, 56, 66, 76, as through holes into which the metal bands 36, 46, 66, 76, 86, 96, 106 are inserted. 86, 96, 106 are placed in place. The through-hole positioning fitting portions 9, 89, 99 disengage the metal bands 36, 46, 66, 76, 86, 96, 106 from the side surfaces of the end plates 35, 45, 65, 75, 85, 95, 105. Can be fixed in place so that there is no. Therefore, as shown in FIGS. 7 to 9 and FIGS. 13 to 15, the through-hole positioning and fitting portion 9 is an end plate having a structure in which the ends of the metal bands 36 and 66 are bent and connected to each other. Suitable for 35 and 65. This is because the position fitting part 9 can prevent the bent metal bands 36 and 66 from being detached from the end plates 35 and 65. Further, the positioning fitting portion 29 which is a fitting groove is inserted into the through hole 17 of the bent portion at the end of the metal bands 26 and 56, and the set screw 7 is inserted into the end plates 25 and 55. It is suitable for a structure that is screwed into the female screw hole 8 and fixed. This is because the metal bands 26 and 56 fixed with the set screw 7 do not come off from the end plates 25 and 55 laterally.

  The metal bands 6, 26, 36, 46, 56, 66, 76, 86, 96 and 106 are manufactured by processing a metal plate having a predetermined thickness into a predetermined width. Metal bands 6, 26, 36, 46, 56, 66, 76, 86, 96, 106 have ends connected to end plates 5, 25, 35, 45, 55, 65, 75, 85, 95, 105. Then, the pair of end plates 5, 25, 35, 45, 55, 65, 75, 85, 95, 105 are connected, and the prismatic battery is held in a compressed state therebetween. The metal bands 6, 26, 36, 46, 56, 66, 76, 86, 96, 106 have a pair of end plates 5, 25, 35, 45, 55, 65, 75, 85, 95, 105 having predetermined dimensions. The prismatic battery stacked between them is fixed to a predetermined compression state. If the metal bands 6, 26, 36, 46, 56, 66, 76, 86, 96, 106 are stretched by the expansion pressure of the prismatic battery, the expansion of the prismatic battery cannot be prevented. Therefore, the metal bands 6, 26, 36, 46, 56, 66, 76, 86, 96, and 106 are made of a metal plate having a strength that does not extend due to the expansion pressure of the square battery, such as a stainless steel plate such as SUS304, a steel plate, or the like. It is manufactured by processing a metal plate into a width and thickness having sufficient strength. Furthermore, the metal band 6 shown in FIG. 4 has processed the metal plate into the groove shape. Since the metal band 6 of this shape can increase the bending strength, there is a feature that the rectangular battery to be stacked can be firmly fixed to a predetermined compression state while narrowing the width.

The metal bands 6, 26, 36, 46, 56, 66, 76, 86, 96, 106 are provided with bent portions at the ends, and the bent portions are arranged on the end plates 5, 25, 35, 45, 55, 65. , 75, 85, 95, 105. The bent portion is connected to the end plates 5, 25, 35, 45, 55, 65, 75, 85, 95, 105 without providing the through hole 17 of the set screw 7 or providing a through hole. The bent portion with the through hole 17 is connected by screwing the set screw 7 inserted through the through hole 17 into the female screw hole 8 of the end plate 5, 25, 45, 55B, 75B, 105B. The bent portion without the through hole is bent inward and connected to the end plates 35 and 65. However, as described above, the metal bands 86 and 96 may be connected to the end plates 85 and 95 by providing the screw portions 86A and the crimping portions 96A at the ends thereof.

  As shown in FIGS. 11 to 20, the metal bands 56, 66, 76, 86, 96 are bent so that the middle is folded, and the folded portion is outside the one end plate 55A, 65A, 75A, 85A, 95A. It is also possible to connect to the surface and connect both ends to the other end plate 55B, 65B, 75B, 85B, 95B. The metal bands 56, 66, 76, 86, 96 can firmly connect the middle folded portion to one end plate 55A, 65A, 75A, 85A, 95A. Furthermore, as shown in FIGS. 21 to 25, the metal band 106 can be fixed to the end plate 105A in an integral structure. This metal band 106 can be most strongly connected to one end plate 105A.

  The above assembled battery is assembled in the following steps.

The assembled battery of FIGS. 2 to 6 is assembled in the following steps.
[Battery block compression process]
Spacers 2 and 22 are arranged between the battery cells 1 which are square batteries, the spacers 2 and 22 and the square batteries are laminated to form a battery block 3, and end plates 5 and 25 are arranged on both sides of the battery block 3. To do. In this state, the end plates 5 and 25 on both sides are pressed with a jig, compressed until the distance between the end plates 5 and 25 reaches a predetermined dimension, and held in this state.
[Metal band connection process]
The battery block 3 is held in a compressed state, and both ends of the metal bands 6 and 26 are fixed to the end plates 5 and 25. The metal bands 6 and 26 in the figure are provided with bent portions having through holes 17 at both ends. The metal bands 6 and 26 are fixed to the end plates 5 and 25 by screwing set screws 7 inserted into the through holes 17 of the bent portions into the female screw holes 8 of the end plates 5 and 25. Further, in the assembled battery of FIGS. 5 and 6, the metal band 26 is fitted in the position fitting portions 29 of the fitting grooves provided on both sides of the end plate 25 and arranged at a fixed position.
[Process to remove from jig]
After fixing all the metal bands 6 and 26 to the end plates 5 and 25, they are removed from the jig.

  Through the above steps, the stacked rectangular batteries are held in a compressed state by the pair of end plates 5 and 25. Therefore, even if the prismatic battery tries to expand due to overcharging or the like, the distance between the end plates 5 and 25 does not change, and the expansion of the prismatic battery is prevented by the end plates 5 and 25. In this assembled battery, since both ends of the metal bands 6 and 26 are fixed to the end plates 5 and 25 with the set screws 7, the metal bands 6 and 26 are firmly fixed to the end plates 5 and 25 and the metal bands 6 and 26 are fixed. Thus, the end plates 5 and 25 can be held at a predetermined size.

The assembled battery of FIGS. 7 to 9 is assembled in the following steps.
[Battery block compression process]
4 to 6, the spacer 22 and the battery cell 1 that is a square battery are stacked, the end plates 35 on both sides are pressed with a jig, and the distance between the end plates 35 is set to a predetermined size. It compresses until it becomes and keeps in this state.
[Metal band connection process]
The battery block 3 is held in a compressed state, and both ends of the metal band 36 are fixed to the end plate 35. The metal band 36 shown in the figure is provided with bent portions having no through holes at both ends. The metal band 36 is inserted into the through-hole position fitting portions 9 provided on both sides of the end plate 35 in a state where the bent portions are provided only at one end or the bent portions are not provided at both ends. The end portion of the inserted metal band 36 is bent inward, the bent portion is brought into close contact with the outer surface of the end plate 35, and the metal band 36 is connected to the end plate 35. The metal band 36 is provided with a bent portion at one end, the tip of the metal band 36 without the bent portion is inserted into the position fitting portion 9 of the through hole, and the straight tip without the bent portion is inside. It can also be bent and connected to the end plate 35.
[Process to remove from jig]
After fixing the metal band 36 to the end plate 35, it is removed from the jig.

  Through the above steps, the stacked rectangular batteries are held in a compressed state by the pair of end plates 35. Even in this assembled battery, even if the square battery is about to expand due to overcharge or the like, the distance between the two end plates 35 does not change, and the end plate 35 can prevent the square battery from expanding. In this assembled battery, the end of the metal band 36 can be bent and fixed to the end plate 35, so that the metal band 36 can be easily fixed to the end plate 35.

  The assembled battery of FIG. 10 inserts the end of the metal band 46 having a straight shape without a bent portion into the position fitting portion 9 of the through hole provided in the end plate 45, and then bends and folds. Except for fixing the metal band 46 to the end plate 45 by inserting the set screw 7 into the through hole 17 of the bent portion and screwing the set screw 7 into the female screw hole 8 of the end plate 45. The battery is assembled in the same manner as the assembled battery of FIGS.

  11 and 12 is assembled by pressing the pair of end plates 55 with a jig to hold the battery block 3 in a compressed state and connecting the tip of the metal band 56 to one end plate 55B. . The metal band 56 is bent so as to be folded back in the middle and provided with bent portions having through holes 17 at both ends. The metal band 56 has a folded portion disposed on the outer surface of the other end plate 55A, and is fitted into the fixed fitting portions 29 of the fitting grooves provided on both sides of the end plate 55 so as to be in place. Deploy. In this state, the bent portions at both ends are fixed to one end plate 55 </ b> B with the set screw 7. In this assembled battery, a pair of end plates 55 can be firmly fixed by two metal bands 56.

  The assembled battery shown in FIGS. 13 to 15 is assembled by pressing the pair of end plates 65 with a jig to hold the battery block 3 in a compressed state, and connecting the tip of the metal band 66 to one end plate 65B. . The metal band 66 is bent so as to be folded back in the middle, but both ends are connected to the end plate 65 as a straight line having no bent portion. The metal band 66 is inserted into the through hole of the positioning fitting portion 9 provided on both sides of the end plate 65A, and the folded portion is disposed on the outer surface of the other end plate 65A. Further, in this state, the end of the straight metal band 66 is protruded from the through hole of the positioning fitting portion 9, the protruding portion is bent inward, and one end plate is bent by the bent portion. Fix to 65B. In this assembled battery, the pair of end plates 65 can be firmly fixed by the two metal bands 66.

  Further, the assembled battery of FIG. 16 is assembled by pressing the pair of end plates 75 with a jig to hold the battery block 3 in a compressed state and connecting the tip of the metal band 76 to one end plate 75B. The metal band 76 is bent so as to be folded back in the middle, but both ends are connected to the end plate 75 as a straight line having no bent portion. The metal band 76 is inserted into the through hole of the positioning fitting portion 9 provided on both sides of the end plate 75, and the folded portion is disposed on the outer surface of the other end plate 75A. Further, in this state, the tip of the straight metal band 76 is protruded from the through hole of the positioning fitting portion 9, and the protruding portion is bent inward to form a bent portion. A set screw 7 is inserted into the through hole 17 (provided in advance), and is fixed to one end plate 75B with the set screw 7. In this assembled battery, the pair of end plates 75 can be firmly fixed by the two metal bands 76.

The assembled battery of FIGS. 17 and 18 is provided with a screw portion 86A at the tip of the metal band 86, and a nut 87 is screwed into the screw portion 86A to connect the metal band 86 to the end plate 85B. It is assembled in the same way as the assembled battery. However, the through-hole positioning and fitting portions 89 provided on both sides of the end plate 85 have an inner shape that can be inserted through the tip of the metal band 86 having the screw portion 86A. After the screw part 86A at the tip of the metal band 86 is inserted into the through hole of the position fitting part 89, a nut 87 is screwed into the screw part 86A to fix the metal band 86 to the end plate 85.

  The assembled battery shown in FIGS. 19 and 20 is provided with a caulking portion 96A at the tip of the metal band 96, crimped so as to expand the caulking portion 96A, and connecting the metal band 96 to the end plate 95. The assembled battery is assembled in the same manner as the assembled battery of FIGS. However, the through hole positioning and fitting portions 99 provided on both sides of the end plate 95 have an inner shape through which the tip of the metal band 96 with the crimping portion 96A can be inserted. After the caulking portion 96A at the tip of the metal band 96 is inserted into the through hole of the position fitting portion 99, the caulking portion 96A is caulked to fix the metal band 96 to the end plate 95.

Furthermore, in the assembled battery shown in FIGS. 21 to 25, the metal band 106 is integrally connected to one end plate 105A. This assembled battery is assembled in the following steps.
[Battery block compression process]
A spacer 22 is disposed between the battery cells 1 that are prismatic batteries, the spacer 22 and the prismatic battery are stacked to form a battery block 3, and end plates 105 are disposed on both sides of the battery block 3. At this time, the metal band 106 connected to the one end plate 105A is inserted into the through hole which is the position fitting portion 9 of the other end plate 105B. The metal band 106 connected to the end plate 105 has a straight shape that does not bend the tip. In this state, the end plates 105 on both sides are pressed with a jig and compressed until the distance between the end plates 105 reaches a predetermined dimension and held in this state.
[Metal band connection process]
The battery block 3 is held in a compressed state, the tip of the metal band 106 protruding from the through hole of the position fitting portion 9 is bent inward, and the bent portion is brought into close contact with the outer surface of the end plate 105B. The metal band 106 is provided with a through hole 17 in advance so as to be positioned at the bent portion. The set screw 7 is inserted into the through hole 17 of the bent portion, and this is screwed into the female screw hole 8 of the end plate 105B to fix the tip of the metal band 106 to the end plate 105B.
[Process to remove from jig]
After fixing both ends of the metal band 106 to the end plate 105B, it is removed from the jig.

  Through the above steps, the stacked rectangular batteries are held in a compressed state by the pair of end plates 105. Therefore, even if the prismatic battery tries to expand due to overcharge or the like, the distance between the end plates 105 does not change, and the expansion of the prismatic battery is prevented by the end plate 105. In this assembled battery, since both ends of the metal band 106 are fixed to the end plate 105B with the set screw 7, the metal band 106 is firmly fixed to the end plate 105B, and the end plate 105 is held at a predetermined size by the metal band 106. it can.

1 ... Battery cell 1A ... Exterior can
DESCRIPTION OF SYMBOLS 1B ... Sealing plate 2 ... Spacer 3 ... Battery block 4 ... Fixed part 5 ... End plate 6 ... Metal band 6A ... 1st metal band
6B ... 2nd metal band 7 ... Set screw 8 ... Female screw hole 9 ... Position fitting part 10 ... Electrode terminal 11 ... Opening part 12 ... Degassing duct 13 ... Connecting tool 15 ... Air blow duct 16 ... Reinforcement rib 17 ... Through hole 22 ... Spacer 24 ... Fixed component 25 ... End plate 26 ... Metal band 29 ... Position fitting part 34 ... Fixed component 35 ... End plate 36 ... Metal band 44 ... Fixed component 45 ... End plate 46 ... Metal band 54 ... Fixed parts 55 ... End plate 55A ... End plate
55B ... End plate 56 ... Metal band 64 ... Fixed part 65 ... End plate 65A ... End plate
65B ... End plate 66 ... Metal band 74 ... Fixed part 75 ... End plate 75A ... End plate
75B ... End plate 76 ... Metal band 84 ... Fixed part 85 ... End plate 85A ... End plate
85B ... End plate 86 ... Metal band 86A ... Screw part 87 ... Nut 89 ... Position fitting part 94 ... Fixing part 95 ... End plate 95A ... End plate
95B ... End plate 96 ... Metal band 96A ... Caulking part 99 ... Position fitting part 104 ... Fixed part 105 ... End plate 105A ... End plate
105B ... End plate 106 ... Metal band 901 ... Battery 905 ... End plate 906 ... Bolt 907 ... Nut 908 ... Ear protrusion

Claims (6)

A battery block including a plurality of prismatic batteries stacked in one direction; a pair of end plates disposed on both end surfaces in the stacking direction of the battery block; a metal band connected to the pair of end plates; A metal band and a rivet for fixing the pair of end plates;
The metal band is
Including a bent portion formed at both ends and having a through-hole through which the rivet is inserted;
Fixed to the outer surface of the pair of end plates via the rivets;
The battery block is fixed in a compressed state via the metal band. The assembled battery according to claim 1,
The battery pack, wherein the pair of end plates includes a positioning fitting portion that positions the metal band at a fixed position. The assembled battery according to claim 2,
The pair of end plates have a fixing hole through which the rivet is inserted,
The assembled battery is characterized in that the metal band is positioned at a position where the through hole and the fixing hole coincide with each other through the positioning fitting portion. The assembled battery according to claim 2 or 3,
The positioning fitting portion is
An assembled battery comprising a protrusion for restricting movement in a direction perpendicular to the extending direction of the metal band. The assembled battery according to any one of claims 1 to 4,
The battery pack is characterized in that the bent portion is locked to the pair of end plates. The assembled battery according to any one of claims 1 to 5,
The pair of end plates includes a metal member, and the metal member is stacked on a prismatic battery positioned at both ends of the battery block via a laminated material.

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