JP2013093224A - Battery pack and vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a decrease in area where a refrigerant flows and an increase in pressure loss.SOLUTION: A battery pack includes a battery group in which a plurality of electric cells are arranged and a first refrigerant passage for leading a refrigerant between the electric cells adjacent each other in the arrangement direction is formed. A plurality of first projections are formed in the first refrigerant passage. Each of the first projections includes: a first arc-shaped part projecting toward the upstream side of the first refrigerant passage; and a pair of first taper-shaped parts extending from both ends of the first arc-shaped part toward the downstream side of the refrigerant passage and coming close to each other.

Description

  The present invention relates to an assembled battery having a battery group in which a plurality of unit cells are arranged and a refrigerant passage is formed between adjacent unit cells in the arrangement direction.

  In recent years, electric vehicles, hybrid vehicles, and the like equipped with electric motors for vehicle travel have attracted attention and are put to practical use as vehicles that are conscious of the global environment. The electric motor is driven by electric power output from a chargeable / dischargeable battery. This type of battery is configured as an assembled battery in which a plurality of single cells are connected. The unit cell generates heat during charging and discharging, and deteriorates when the heating temperature increases.

  As means for suppressing the temperature rise of the unit cells, Patent Document 1 discloses a plurality of unit cells, a housing in which these unit cells are incorporated and in which a cooling medium flows, formed on the inner surface of the housing, and in contact with the cooling medium. Disclosed is a secondary battery module having a protruding portion.

JP 2006-278332 A JP-A-2005-116342 JP 2007-042637 A JP 2010-092723 A JP 2002-033137 A JP 2000-243461 A JP 2001-319697 A

  However, in Patent Document 1, since the protruding portion is formed in a columnar shape or a hemispherical shape, a useless region where the refrigerant does not flow is generated in a region close to the downstream end portion of the protruding portion. In addition, the refrigerant branched by contacting the protrusions is concentrated in one place, which may increase the pressure loss.

  Accordingly, an object of the present invention is to suppress a decrease in the area through which the refrigerant flows and an increase in pressure loss.

  In order to solve the above-described problems, the assembled battery according to the present invention includes: (1) a plurality of unit cells are arranged, and a first refrigerant passage is formed between the unit cells adjacent to each other in the arrangement direction. In the assembled battery having the above-described battery group, a plurality of first protrusions are formed in the first refrigerant passage, and the first protrusions are upstream of the first refrigerant passage. A first arcuate portion that protrudes toward the side, and a pair of first tapers that extend from both ends of the first arcuate portion toward the downstream side of the first refrigerant passage and approach each other. And a shape portion.

  (2) In the configuration of (1) above, a second refrigerant passage is formed between the adjacent unit cells at a position adjacent to the first refrigerant passage. An inflow opening that allows the refrigerant exhausted from the discharge port to flow into the second refrigerant passage may be provided. According to the configuration of (2), by flowing the refrigerant exhausted from the first refrigerant passage into the second refrigerant passage, the refrigerant is reused and the cooling performance can be improved.

  (3) In the configuration of the above (2), the first refrigerant passage and the second refrigerant passage may be opposite to each other in the direction in which the refrigerant flows. According to the configuration of (3), the refrigerant exhausted from the first refrigerant passage can be supplied to the second refrigerant passage without making a detour.

  (4) In the configuration of (2) or (3), the configuration further includes a spacer member disposed between the adjacent unit cells, and the plurality of first protrusions are formed on the spacer member. And can be brought into contact with the outer surface of the unit cell. According to the configuration of (4), the first refrigerant passage is formed between the spacer member and the outer surface of the unit cell, and the cooling capacity in the first refrigerant passage can be enhanced.

  (5) In the configuration of (3) or (4) above, the spacer member is formed with a partition wall that partitions the first refrigerant passage and the second refrigerant passage by contacting the outer surface of the unit cell. A lip portion that forms the inflow opening by being located at a position spaced apart from the outer surface of the unit cell at the tip of the partition, and the discharge port of the first refrigerant passage A first guide portion that directs the refrigerant exhausted from the refrigerant to the second refrigerant passage through the inflow opening, and the refrigerant that has flowed in from the first refrigerant passage downstream of the second refrigerant passage. And a second guide portion directed to the side. According to the configuration of (5), the refrigerant exhausted from the first refrigerant passage can be more reliably supplied to the second refrigerant passage.

  (6) In the configuration of (5), the first guide part also serves as an outer wall of a cylindrical member surrounding a restraining member that restrains the battery group in the arrangement direction, and the second guide part is , And also serves as a suppressing member that suppresses the positional deviation of the unit cell by pressing the unit cell. According to the structure of (6), since the independent 1st guide part and 2nd guide part become unnecessary, cooling performance can be improved, suppressing the increase in a number of parts.

  (7) In the configurations of (1) to (6), the plurality of first protrusions can be arranged in a staggered manner. According to the configuration of (7), the cooling efficiency can be further increased.

  (8) In the configurations of (2) to (7) above, a plurality of second protrusions are formed in the second refrigerant passage, and the second protrusions are the second refrigerant. A second arcuate portion that protrudes toward the upstream side of the passage, and a pair of second portions that extend from both ends of the second arcuate portion toward the downstream side of the second refrigerant passage and approach each other. And a tapered portion. According to the structure of (8), the fall of the cooling area of the refrigerant | coolant which flows through a 2nd refrigerant path, and the increase in pressure loss can be suppressed.

  (9) In the configuration of (8) above, the plurality of second protrusions can be arranged in a staggered manner. According to the configuration of (9), the cooling efficiency can be further increased.

(10) The assembled battery according to any one of (1) to (9) above,
And a motor that generates power for driving the vehicle with electric power supplied from the assembled battery. According to the configuration of (10), a vehicle having a long battery life can be provided.

  According to the present invention, it is possible to suppress a decrease in the area through which the refrigerant flows and an increase in pressure loss.

It is a perspective view of an assembled battery. It is sectional drawing of an assembled battery. It is the schematic diagram which showed typically the flow velocity distribution of the refrigerant | coolant which flows into a spacer member (embodiment). It is the schematic diagram which showed typically the flow velocity distribution of the refrigerant | coolant which flows into a spacer member (comparative example). It is an enlarged view of the 1st projection part. It is the graph which showed the test result of the evaluation test of pressure loss and cooling capacity.

  FIG. 1 is a perspective view of the assembled battery according to the present embodiment. FIG. 2 is a cross-sectional view of the assembled battery taken along the YZ plane, with some elements shown through. In these drawings, an X axis, a Y axis, and a Z axis indicate three mutually orthogonal orthogonal axes. The assembled battery 100 includes a battery group 1 in which cells 11 and spacer members 2 are alternately stacked, a pair of end plates 3, and first to fourth restraining bands (corresponding to restraining members) 4a to 4d. The assembled battery 100 stores electric power supplied to a motor that drives the vehicle. The vehicle may be an electric vehicle that drives wheels only by the power of the motor, or a hybrid vehicle that uses both the power of the motor and the power of the engine as power sources. The hybrid vehicle may be a plug-in hybrid vehicle that can be charged by a commercial power source provided outside the vehicle.

  The battery group 1 includes a plurality of single cells 11 that are electrically connected in series with each other. These unit cells 11 are stacked in the X-axis direction (corresponding to the arrangement direction). The unit cell 11 is a so-called square cell having a pair of outer surfaces facing in the stacking direction of the unit cells 11, a pair of outer surfaces facing in the Y-axis direction, and a pair of outer surfaces facing in the Z-axis direction. The single battery 11 may be a secondary battery such as a lithium ion battery or a nickel metal hydride battery. The unit cell 11 may be a capacitor. A projecting positive electrode terminal 11a and a negative electrode terminal 11b are formed side by side in the Y-axis direction on one of the pair of outer surfaces facing in the Z-axis direction.

  As shown in FIG. 2, the positive electrode terminal 11a is connected to a power generation element (not shown) located inside the unit cell 11 via a positive electrode connection terminal 11c. The negative electrode terminal 11b is connected to a power generation element (not shown) located inside the unit cell 11 via a negative electrode connection terminal 11d. Each of the first to fourth restraint bands 4 a to 4 d extends in the stacking direction of the unit cells 11 and is covered with an insulating protective frame 12. The protective frame 12 may be a resin. The protective frame 12 corresponds to a cylindrical member.

  The pair of end plates 3 are arranged at positions sandwiching the battery group 1. A pair of sandwiching plates 33a and 33b that sandwich and hold the first restraining band 4a and the third restraining band 4c are formed on the end surfaces of the pair of end plates 3 in the X-axis direction. These sandwiching plates 33 a and 33 b are riveted via rivets 6. Thereby, the 1st restraint band 4a and the 3rd restraint band 4c are fixed firmly.

  A pair of clamping plates 32a and 32b are formed on the end surfaces in the X-axis direction of the pair of end plates 3 at positions aligned with the clamping plates 33a and 33b in the Y-axis direction. The pair of sandwiching plates 32a and 32b sandwich and hold the second restraining band 4b and the fourth restraining band 4d. These sandwiching plates 32 a and 32 b are riveted via a rivet 6. Thereby, the 2nd restraint band 4b and the 4th restraint band 4d are fixed firmly.

  A pair of end plate 3 is provided with the flange part 34 extended along an XY plane direction (refer FIG. 1). The flange portion 34 includes a through hole portion 34a. The assembled battery 100 can be fixed to the fixed portion of the vehicle by fastening a fastening member (not shown) to the through hole portion 34a. Here, the fixed portion of the vehicle may be a floor panel located under the vehicle seat or the inside of the luggage room.

  Referring to FIG. 1, among unit cells 11 adjacent to each other in the stacking direction, positive electrode terminal 11a of one unit cell 11 and negative electrode terminal 11b of the other unit cell 11 face each other in the stacking direction. The positive terminal 11a and the negative terminal 11b are electrically and mechanically connected via a bus bar 51 illustrated in FIG.

  Here, the bus bar 51 is formed with a pair of through-hole portions penetrating in the plate thickness direction (Z-axis direction), and one through-hole portion has a positive electrode terminal in one unit cell 11 adjacent in the stacking direction. 11a is inserted, and the negative terminal 11b of the other unit cell 11 is inserted through the other through hole. Screw grooves are formed on the outer surfaces of the positive electrode terminal 11a and the negative electrode terminal 11b, and the bus bar 51 is fixed by fastening a fastening nut 61 in these screw grooves. However, the unit cells 11 adjacent in the stacking direction may be electrically connected in parallel. In order to simplify the drawing, the bus bar 51 and the fastening nut 61 are not shown in FIG.

  The spacer member 2 is located between the unit cells 11 adjacent in the X-axis direction. With reference to FIG. 2, a first protrusion group 21 and a second protrusion group 22 are formed on the end surface of the spacer member 2 in the X-axis direction. The first protrusion group 21 includes a plurality of first protrusions 21a. The second protrusion 22 is composed of a plurality of second protrusions 22a. The first protrusion group 21 and the second protrusion group 22 face each other in the Y-axis direction with a partition wall 23 extending in the Z-axis direction interposed therebetween.

  That is, the first projection group 21 is formed in a region sandwiched between a pair of partition walls 23 facing in the Y-axis direction, and the second projection group 22 is connected to the first projection group 21 across the partition wall 23. It is formed in the area which faces.

  Here, the region where the first projection group 21 is located, that is, the region sandwiched between the pair of partition walls 23 is defined as the first refrigerant passage 31, and the region where the second projection group 22 is located, ie, the first A region facing one refrigerant passage 31 with the partition wall 23 interposed therebetween is defined as a second refrigerant passage 32. A white arrow indicates a direction in which the refrigerant flowing into the first refrigerant passage 31 flows. The black arrow indicates the direction in which the refrigerant flowing into the second refrigerant passage 32 flows. The arrow of the double track indicates the direction in which the refrigerant flowing from the first refrigerant passage 31 into the second refrigerant passage 32 flows. Note that the refrigerant is air. The refrigerant is supplied to the first refrigerant passage 31 by operating a blower (not shown).

  The first protrusion 21a is formed in a so-called teardrop type having a first isolated portion 211a and a pair of first tapered portions 211b. The first arcuate portion 211 a is bent in a convex direction toward the upstream side of the first refrigerant passage 31. The pair of first tapered portions 211b are formed in tapered shapes that extend from both ends of the first isolated portion 211a toward the downstream side of the first refrigerant passage 31 and approach each other. These first protrusions 21a are arranged in a staggered manner. Here, staggered is an array state in which another first protrusion 21a is located at a position shifted in the Z-axis direction (the direction in which the refrigerant flows) from the intermediate position of the first protrusion 21a facing in the Y-axis direction. Means.

  The second protrusion 22a is formed in a so-called teardrop type having a second isolated portion 221a and a pair of second tapered portions 221b. The second arcuate portion 221 a is bent in a direction that is convex toward the upstream side of the second refrigerant passage 32. The pair of second tapered portions 221b are formed in tapered shapes that extend from both ends of the second isolated portion 221a toward the downstream side of the second refrigerant passage 32 and approach each other. These second protrusions 22a are arranged in a staggered manner. Since the zigzag meaning has been described above, the description will not be repeated.

  At the lower end portion of the spacer member 2, a discharge port 2 c for allowing moisture such as condensed water to escape to the outside of the spacer member 2 is formed. The partition wall 23 is formed with a water guide portion 2b extending toward the discharge port 2c. The condensed water adhering to the spacer member 2 and the like is guided to the discharge port 2c through the water guide portion 2b. Further, the discharge port 2 c in this embodiment is also used as the discharge port of the second refrigerant passage 32.

  A lip portion 23 a is formed at the tip of the partition wall 23. The lip portion 23 a is formed in a thin shape having dimensions smaller in the Y-axis direction and the X-axis direction than the partition wall 23. The lip portion 23 a extends toward the protective frame lower surface 12 a of the protective frame 12.

  In the assembled state of the assembled battery 100, the first protrusion group 21, the second protrusion group 22, and the partition wall 23 come into contact with the outer surface (the outer surface in the X-axis direction) of the unit cell 11, so that the first refrigerant passage 31 and A second refrigerant passage 32 is formed. Since the lip portion 23 a is formed thinner than the partition wall 23, the lip portion 23 a allows the refrigerant that has flowed out from the first refrigerant passage 31 to flow into the second refrigerant passage 32. That is, a gap (inflow opening) is formed between the lip portion 23a and the outer surface of the unit cell 11, and the refrigerant is transferred from the first refrigerant passage 31 to the second refrigerant passage 32 through the gap. Flows in.

  The spacer member 2 is formed with an inclined extending portion 2 a extending toward the second protrusion group 22. The inclined extending portion 2a is inclined toward the side closer to the first refrigerant passage 31 as the distance from the spacer member 2 increases (as the distance from the second protrusion group 22 increases). The inclined extending portion 2 a is in contact with the upper surface of the unit cell 11, thereby suppressing the positional deviation of the unit cell 11. Here, the protective frame lower surface 12a of the protective frame 12 directs a part of the refrigerant exhausted from the first refrigerant passage 31 toward the second refrigerant passage 32 as indicated by a double-track arrow. The inclined extending portion 2a directs the refrigerant that has flowed from the first refrigerant passage 31 toward the downstream side of the second refrigerant passage 32, as indicated by a black arrow. The protective frame lower surface 12a corresponds to a first guide portion, and the inclined extension portion 2a corresponds to a second guide portion.

  As described above, according to the configuration of the present embodiment, since the lip portion 23a is provided, the refrigerant exhausted from the outlet of the first refrigerant passage 31 flows into the second refrigerant passage 32. Reduction of pressure loss can be suppressed. That is, according to the configuration of the present embodiment, a configuration that does not allow the refrigerant to flow from the first refrigerant passage 31 to the second refrigerant passage 32 (that is, the first refrigerant passage 31 and the second refrigerant passage 32, and The amount of cooling air can be increased as compared with the configuration in which is blocked by the partition wall 23.

  Further, the refrigerant exhausted from the outlet of the first refrigerant passage 31 can be used again for cooling in the second refrigerant passage 32. Thereby, compared with the structure cooled only using the 1st refrigerant path 31, a cooling capability can be increased.

  Furthermore, since the cooling performance can be increased simply by forming a part of the partition wall 23, the cost can be reduced by reducing the number of parts.

  Moreover, since the protective frame lower surface 12a and the inclined extending portion 2a function as a guide portion for guiding the refrigerant from the first refrigerant passage 31 to the second refrigerant passage 32, the cooling capacity is provided without providing an independent guide portion. Can be increased.

  Next, the effect of the first protrusion 21a will be described in detail with reference to a comparative example. FIG. 3 schematically shows the flow velocity distribution of the refrigerant flowing through the spacer member of the present embodiment. FIG. 4 schematically shows the flow velocity distribution of the refrigerant flowing through the spacer member in which the cylindrical protrusions (comparative example) are arranged in a staggered manner. A black hatched area indicates an area where the flow rate is extremely low (hereinafter referred to as a low cooling area).

  With reference to these drawings, in the configuration of the comparative example, the refrigerant flowing in the vicinity of the cylindrical projection 21a ′ goes straight so as to be peeled off from the cylindrical projection 21a ′, and therefore, downstream of the cylindrical projection 21a ′. A larger low cooling region is formed. On the other hand, in the configuration of the present embodiment, since the first protrusion 21a is formed in a so-called teardrop type, the refrigerant flows along the first tapered portion 211b. The low cooling region formed on the downstream side of 21a can be reduced. Therefore, according to the structure of this embodiment, the cooling area with respect to the cell 11 can be enlarged rather than the structure of a comparative example.

  Further, in the configuration of the comparative example, as indicated by the dotted circle, the refrigerant flow concentrates in the vicinity of the outer edge portion of the columnar protrusion 21a ′, so that the pressure loss increases. On the other hand, in the configuration of the present embodiment, as indicated by the dotted ellipse, the refrigerant is dispersed in the entire gap formed between the adjacent first protrusions 21a, so that a decrease in pressure loss can be suppressed. .

Referring to FIG. 5, θ ≦ 23 ° is preferable, where θ is the angle of first tapered portion 211b with respect to the direction in which the refrigerant flows. When the angle θ satisfies the above condition,
It is possible to sufficiently suppress the separation of the refrigerant from the first protrusion 21a, that is, the refrigerant can be advanced along the first tapered portion 211b. The above-described effect can also be obtained in the second protrusion 22a.

  In addition, the contact area of the first protrusion 21a (Example) and the columnar protrusion 21a '(Comparative Example) with the unit cell 11 was made equal to each other, and a test on pressure loss and cooling capacity was performed. Specifically, the test was performed by measuring the pressure loss when the refrigerant was conducted between the adjacent unit cells 11 and the temperature of the outer surface of the unit cell 11. Note that aluminum was used for the case of the unit cell 11. The result is shown in FIG.

  In the figure, in the second embodiment, the size of the first protrusion 21a is set smaller than that in the first embodiment (that is, the number of the first protrusions 21a is larger), and the third embodiment is the same as the first embodiment. The size of the first protrusion 21a is set to be smaller than 2. In all of Examples 1 to 3 and Comparative Example 1, the contact area with respect to the unit cell 11 is equal to each other, and the contact pressure with respect to the unit cell 11 is the same. Here, when the unit cell 11 is a lithium ion battery, the output fluctuates due to a change in the binding pressure. Therefore, a more accurate evaluation (comparison) regarding the pressure loss and the cooling capacity can be performed by performing the test in a state where the contact areas with respect to the unit cells 11 are the same.

  As shown in FIG. 6, Example 1 had a pressure loss of 10.5 Pa and an exothermic temperature of 45.0 ° C. In Example 2, the pressure loss was 11.9 Pa and the exothermic temperature was 44.4 ° C. In Example 3, the pressure loss was 13.6 Pa, and the exothermic temperature was 44.3 ° C. Comparative Example 1 had a pressure loss of 20.7 Pa and an exothermic temperature of 44.4 ° C.

  Although Example 1 was inferior to Comparative Example 1 in cooling capacity for cooling the unit cell 11, the pressure loss could be greatly reduced. Examples 2 and 3 were superior (or equivalent) to cooling capacity than Comparative Example 1, and were able to greatly reduce pressure loss. By comparing and referring to the first to third embodiments, various design changes such as giving priority to pressure loss or increasing the cooling capacity can be easily performed by changing the size of the first protrusion 21a. I understood that. That is, according to the present embodiment, the cooling capacity can be improved while maintaining the contact pressure with respect to the unit cell 11.

(Modification 1)
In the above-described embodiment, the first protrusion group 21 and the second protrusion group 22 are formed on the spacer member 2, but the present invention is not limited to this. The first protrusion group 21 and the second protrusion group 22 may be formed on the outer surface of the unit cell 11. In this case, the spacer member 2 can be omitted.

(Modification 2)
In the above-described embodiment, the lip portion 23a is provided to allow the refrigerant to flow from the first refrigerant passage 31 to the second refrigerant passage 32. However, the present invention is not limited to this, It may be a configuration. In the other configuration, a plurality of openings (corresponding to the inflow openings) that allow the refrigerant to flow from the first refrigerant passage 31 to the second refrigerant passage 32 are formed in an extension portion obtained by extending the partition wall 23. The configuration may be such that the refrigerant flows from the first refrigerant passage 31 into the second refrigerant passage 32 through these openings. The said other structure may be the structure which abbreviate | omitted the lip | rip part 23a. In this case, an inflow opening is formed in a region sandwiched between the partition wall 23 and the protective frame lower surface 12a, and the refrigerant flows from the first refrigerant passage 31 into the second refrigerant passage 32 through the inflow opening.

(Modification 3)
In the above-described embodiment, the first refrigerant passage 31 is formed so that the refrigerant flows from the lower side to the upper side of the unit cell 11, but the present invention is not limited to this, and from the upper side of the unit cell 11. The first refrigerant passage 31 may be formed so that the refrigerant flows downward. In this case, the refrigerant conducted to the second refrigerant passage 32 flows from the lower side to the upper side of the unit cell 11. Moreover, the structure introduce | transduced into the inside of the battery group 1 from the side of the cell 11 (Y-axis direction in FIG. 1) may be sufficient.

DESCRIPTION OF SYMBOLS 1 Battery group 2 Spacer member 2a Inclined extension part 2b Water guide part 2c Outlet 3 End plate 4a-4d 1st-4th restraint band
6 Rivet 11 Cell 11a Positive terminal 11b Negative terminal
12 Protective frame 12a Protective frame lower surface 21 1st protrusion group 21a 1st protrusion part 22 2nd protrusion group 22a 2nd protrusion part 23 Partition 23a Lip part 100 Battery pack 211a 1st isolated part 211b 1st Tapered portion 221a Second arcuate portion 221b Second tapered portion

Claims (10)

An assembled battery having a battery group in which a plurality of unit cells are arranged and a first refrigerant passage is formed between the unit cells adjacent in the arrangement direction to conduct a refrigerant.
A plurality of first protrusions are formed in the first refrigerant passage,
The first protrusion includes a first arcuate portion that protrudes toward the upstream side of the first refrigerant passage, and downstream of the first refrigerant passage from both ends of the first arcuate portion. A pair of first tapered portions extending toward the side and approaching each other;
An assembled battery comprising: Between the adjacent cells, a second refrigerant passage is formed at a position adjacent to the first refrigerant passage,
The assembled battery according to claim 1, further comprising an inflow opening that allows the refrigerant exhausted from the discharge port of the first refrigerant passage to flow into the second refrigerant passage.   The assembled battery according to claim 2, wherein the first refrigerant passage and the second refrigerant passage are opposite to each other in a direction in which the refrigerant flows. Furthermore, it has a spacer member arranged between the adjacent unit cells,
4. The assembled battery according to claim 2, wherein the plurality of first protrusions are formed on the spacer member and are in contact with an outer surface of the unit cell. 5. The spacer member is formed with a partition wall that partitions the first coolant passage and the second coolant passage by contacting the outer surface of the unit cell. A lip portion forming the inflow opening is formed by being located at a position separated from the outer surface,
A first guide portion for directing the refrigerant exhausted from the discharge port of the first refrigerant passage toward the second refrigerant passage through the inflow opening;
A second guide part for directing the refrigerant flowing from the first refrigerant passage toward the downstream side of the second refrigerant passage;
The assembled battery according to claim 3, wherein: The first guide portion also serves as an outer wall of a cylindrical member surrounding a restraining member that restrains the battery group in the arrangement direction.
The assembled battery according to claim 5, wherein the second guide portion also serves as a suppressing member that presses the unit cell and suppresses the positional deviation of the unit cell.   The assembled battery according to any one of claims 1 to 6, wherein the plurality of first protrusions are arranged in a staggered manner. A plurality of second protrusions are formed in the second refrigerant passage,
The second protrusion includes a second arcuate portion that protrudes toward the upstream side of the second refrigerant passage, and downstream of the second refrigerant passage from both ends of the second arcuate portion. The assembled battery according to claim 2, further comprising a pair of second tapered portions that extend toward the side and approach each other.   The assembled battery according to claim 8, wherein the plurality of second protrusions are arranged in a staggered manner. An assembled battery according to any one of claims 1 to 9,
And a motor that generates power for driving the vehicle with electric power supplied from the assembled battery.

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