Battery system and flying vehicle equipped with it

Abstract

To perform heat equalization at each of unit batteries constituting a battery module.SOLUTION: A battery module 30 has a plurality of battery packs 48 that each include a first unit battery 54 and a second unit battery 56 that are adjacent to each other. The first unit battery 54 has a positive electrode terminal 60f and a negative electrode terminal 62f that are directed and extend in a first direction from a first end 64f of a first body 58f. The second unit battery 56 has a positive electrode terminal 60s and a negative electrode terminal 62s that are directed and extend in a second direction opposite to the first direction from a first end 64s of a second body 58s. In the battery pack 48, at least part of the first body 58f and the second body 58s overlap and are in contact with each other. Further, a heat conduction material 50 to which heat is conducted from the first unit battery 54 or the second unit battery 56 is in contact with the battery pack 48.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a battery system having a plurality of battery modules and an air vehicle equipped with the battery system. [Background technology]

[0002] As one type of flying object, an electric multicopter equipped with a battery pack is known. In this case, the multicopter is provided with a lift generating device such as a prop or a ducted fan. The airframe is equipped with a motor for rotating the lift generating device and a battery pack for supplying power to the motor. In some cases, a generator for supplying power to the battery pack and the motor may also be installed. Then, depending on the flight state of the multicopter, the battery pack is discharged or the generator charges the battery pack. The battery pack is configured by electrically connecting a plurality of battery modules housed in one casing.

[0003] During charging and discharging, the cells constituting the battery module increase in temperature and become heated. In order to prevent the temperature of the cells from increasing excessively, heat is removed from the cells as much as possible. For example, in the technology described in Patent Document 1, a heat absorbing means is arranged between rows of a plurality of stacked cells. In addition, Patent Document 2 proposes a configuration in which a heat transfer material is inserted between the cells and further the heat transfer material is brought into contact with a water jacket. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2013-222603 A [Patent Document 2] JP 2013-161559 A Summary of the Invention [Problem to be solved by the invention]

[0005] As shown in FIG. 2 of Patent Document 2, the body of a typical unit cell has a thin-walled rectangular parallelepiped (rectangular prism) shape. A positive terminal and a negative terminal protrude from the same end face of the body and extend in the same direction. In a unit cell body configured in this way, the temperature rises most at the end where the positive terminal and the negative terminal protrude. In other words, heat distribution or temperature differences occur in the unit cells. Therefore, it is desirable to equalize the heat among the individual unit cells and minimize the temperature differences as much as possible.

[0006] The technology described in Patent Document 1 is to cover the stacked cell string with a heat absorbing means as described above, so it is difficult to substantially equalize the heat of the individual cells.

[0007] Furthermore, according to the configuration described in Patent Document 2, the unit cells and the heat transfer material are arranged alternately in parallel, which is thought to enable heat to be quickly removed from the unit cells. However, the amount of heat transferred from the unit cells to the heat transfer material is almost the same regardless of the location. In other words, it is difficult for a single heat transfer material to absorb a large amount of heat from the high heat part of the unit cells while absorbing a small amount of heat from the low heat part. For this reason, even with the technology described in Patent Document 2, it is difficult to approximately equalize the heat of each unit cell.

[0008] The present invention has been made to solve the above-mentioned problems, and aims to provide a battery system that is capable of equalizing heat among individual cells and avoids the need for large-scale cooling equipment, and an aircraft equipped with the battery system. [Means for solving the problem]

[0009] In order to achieve the above object, according to one embodiment of the present invention, there is provided a battery system including a battery module having a plurality of single cells, each having a positive terminal and a negative terminal extending in the same direction, comprising: a first body having a first end and a second end, a first cell having a positive electrode terminal and a negative electrode terminal extending from the first end in a first direction, and a second body having a first end and a second end, a second cell having a positive electrode terminal and a negative electrode terminal extending from the first end in a second direction opposite to the first direction, the second cell being adjacent to each other; In the battery assembly, at least a portion of the first body and the second body overlap and contact each other, The battery system includes a heat conductive material that conducts heat from the first cell or the second cell and is in contact with the battery set. Effect of the Invention

[0010] According to the present invention, the first cell and the second cell in the battery assembly are stacked together such that the first end portion having a high temperature is in contact with, for example, the second end portion having a low temperature or a thermally conductive material. On the other hand, the second end portion is in contact with, for example, the first end portion having a high temperature or the second end portion of the remaining cell. In this way, by configuring the battery assembly so that the first ends do not come into contact with each other, it is possible to equalize the heat among the individual first cell and second cell.

[0011] That is, heat can be sufficiently removed from the first end portion, which becomes hot, and therefore it is possible to prevent a part of the first cell or the second cell from becoming locally hot, and therefore large-scale cooling equipment is not required.

[0012] Therefore, when a battery system including the above-mentioned battery module is mounted on an aircraft, the degree of freedom of equipment layout is improved. In addition, since there is no need to mount a large-scale cooling facility, the total weight of the aircraft can be reduced. Moreover, it is also possible to reduce power consumption. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a schematic perspective view of a flying object (multicopter) according to an embodiment of the present invention. [Diagram 2] 1 is a schematic configuration diagram of a main part of a battery system including a battery module. [Diagram 3] 1 is an exploded perspective view of a main part of a battery module included in a battery system according to a first embodiment. FIG. [Figure 4] 2 is a plan view of a main portion of a stack that constitutes a battery module. FIG. [Diagram 5] FIG. 5A is a connection explanatory diagram showing the electrical connection relationship between the positive electrode terminal and the negative electrode terminal, and FIG. 5B is its equivalent circuit. [Figure 6] FIG. [Figure 7] FIG. 4 is a front view of a unit cell showing a temperature difference when the unit cell becomes heated. [Figure 8] 13 is a schematic partially exploded perspective view of a laminate constituting a battery module included in a battery system according to a second embodiment. FIG. [Figure 9] FIG. 9 is a schematic plan view of the laminate shown in FIG. [Figure 10] FIG. 9 is a schematic front view of the laminate shown in FIG. [Figure 11] FIG. 11A is a connection explanatory diagram showing the electrical connection relationship between a positive electrode terminal and a negative electrode terminal, and FIG. 11B is its equivalent circuit. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] A battery system according to the present invention will be described in detail below with reference to the accompanying drawings, showing preferred embodiments thereof in relation to an air vehicle equipped with the battery system. In the following, "front" and "rear" refer to the forward and rearward flight direction of the air vehicle (multicopter 10 shown in FIG. 1). Furthermore, "down" and "up" refer to the directions facing downward and upward of the air vehicle. Furthermore, "left" and "right" refer to the left and right when viewed from inside the air vehicle. "Width direction" is synonymous with "left-right direction."

[0015] Furthermore, a first cell 54 and a second cell 56 described below are the same battery, but are given different names and reference numbers in order to simplify the description and make it easier to understand.

[0016] 1 is a schematic perspective view of a multicopter 10 as a flying object according to the present embodiment. The multicopter 10 includes an airframe 12, a right main wing 14R and a left main wing 14L that protrude from the front side of the airframe 12 and extend in the width direction, and a right horizontal stabilizer 16R and a left horizontal stabilizer 16L that protrude from the rear side of the airframe 12 and extend in the width direction. Furthermore, a right support bar 18R is bridged from the right main wing 14R to the right horizontal stabilizer 16R, and a left support bar 18L is bridged from the left main wing 14L to the left horizontal stabilizer 16L.

[0017] Props 20a to 20c are provided on the right main wing 14R, the right support bar 18R, and the right horizontal stabilizer 16R, respectively. Meanwhile, props 22a to 22c are provided on the left main wing 14L, the left support bar 18L, and the left horizontal stabilizer 16L, respectively. These six props 20a to 20c, 22a to 22c are lift generating devices. In other words, the multicopter 10 can take off and fly in the air under the action of the six props 20a to 20c, 22a to 22c.

[0018] The airframe 12 is equipped with a battery system 32 including motors (not shown) in the same number as the props 20a-20c, 22a-22c, and a battery module 30 (see FIG. 2). The rotors of the props 20a-20c, 22a-22c are individually connected to the rotating shafts of the motors. When power is supplied to the motors from a battery pack 33 (see FIG. 2) constituting the battery system 32, the motors are energized. This causes the rotating shaft to rotate, and the rotors rotate integrally with the rotating shaft. As the props 20a-20c, 22a-22c are energized in this manner, the multicopter 10 can take off or fly in the air.

[0019] 2 to 6, a battery system 32 according to the first embodiment will be described in relation to the battery modules 30 included therein. In this case, the battery system 32 includes a battery pack 33 configured by housing a plurality of battery modules 30 (for example, about 20) in a casing 34, and a cooling facility 36.

[0020] 3 and 4, each battery module 30 has a plurality of battery assemblies 48 and a thermally conductive material 50 interposed between the battery assemblies 48. The plurality of battery assemblies 48 and the thermally conductive materials 50 are alternately stacked to form a stacked body 52. ​​As shown in FIG. 4, which shows a plan view of the stacked body 52, the battery assemblies 48 are made up of a combination of one first cell 54 and one second cell 56. The first cell 54 and the second cell 56 are made up of, for example, lithium ion batteries.

[0021] As shown in Figs. 3 and 4, the first battery cell 54 has a first body 58f having a substantially rectangular shape, and a positive terminal 60f and a negative terminal 62f protruding in the form of tabs from the first body 58f. The positive terminal 60f and the negative terminal 62f protrude from a first end 64f of the first body 58f and extend in the same direction (first direction). If the end of the first body 58f opposite to the first end 64f is a second end 66f, the second end 66f faces a second direction opposite to the first direction. The first direction is, for example, the right side in the width direction of the multicopter 10, and in this case, the second direction is the left side in the width direction of the multicopter 10.

[0022] The second cell 56 has a second body 58s having a substantially rectangular shape, and a positive terminal 60s and a negative terminal 62s protruding in the form of tabs from the second body 58s. The positive terminal 60s and the negative terminal 62s protrude from a first end 64s of the second body 58s and extend in a second direction. The second body 58s has a second end 66s that is an end opposite to the first end 64s and faces a first direction that is opposite to the second direction. That is, in the first embodiment, the extending direction of the positive terminal 60f and the negative terminal 62f of the first cell 54 and the extending direction of the positive terminal 60s and the negative terminal 62s of the second cell 56 are opposite to each other.

[0023] In the first embodiment, the first cell 54 and the second cell 56 are in a lying position with the positive terminals 60f, 60s and the negative terminals 62f, 62s facing in the width direction of the multicopter 10. The first body 58f and the second body 58s are adjacent to each other in abutting contact such that the first end 64f of the first body 58f faces the second end 66s of the second body 58s, and the second end 66f of the first body 58f faces the first end 64s of the second body 58s. Here, the length, height, and thickness of the first body 58f and the second body 58s are approximately equal to each other. Therefore, in this battery set 48, the entire second body 58s abuts against the entire first body 58f.

[0024] This battery set 48 is sandwiched between two pieces of thermally conductive material 50. One piece of thermally conductive material 50 is sandwiched between adjacent battery sets 48. Therefore, one thermally conductive material 50 does not come into contact with another thermally conductive material 50. Suitable examples of the thermally conductive material 50 include a so-called vapor chamber, that is, a plate-shaped (flat) heat pipe, a graphite sheet, and the like.

[0025] The positive electrode terminal 60f (and the negative electrode terminal 62f) of a first cell 54 of a battery set 48 is upside down and the negative electrode terminal 62f of a first cell 54 of a battery set 48 adjacent to the battery set 48 are upside down. That is, as shown in Fig. 5A and Fig. 6, when the positive electrode terminal 60f is located on the bottom and the negative electrode terminal 62f is located on the top in the first cell 54 of a battery set 48, the positive electrode terminal 60f is located on the top and the negative electrode terminal 62f is located on the bottom in the first cell 54 of the adjacent battery set 48. The same applies to the second cell 56.

[0026] Then, the negative electrode terminal 62f of the first cell 54 is electrically connected to the positive electrode terminal 60f of the first cell 54 of the adjacent battery group 48 at the rear of the paper of FIG. 5A (left side of the paper of FIG. 6) via the bus bar 70 (see FIG. 6). Furthermore, the negative electrode terminal 62f of the first cell 54 is electrically connected to the positive electrode terminal 60f of the first cell 54 of the adjacent battery group 48 at the rear of the paper of FIG. 5A (left side of the paper of FIG. 6). This is repeated thereafter. Then, in the battery group 48 at the end in the stacking direction located at the rearmost side of the paper of FIG. 5A, in other words, at the leftmost side of FIG. 6, the negative electrode terminal 62f of the first cell 54 is electrically connected to the positive electrode terminal 60s of the second cell 56 in the same battery group 48 (see FIG. 5A).

[0027] The negative terminal 62s of the second cell 56 is electrically connected to the positive terminal 60s of the second cell 56 of the adjacent battery group 48 on the front side of the paper in FIG. 5A (the right side of the paper in FIG. 6). Furthermore, the negative terminal 62s of the second cell 56 is electrically connected to the positive terminal 60s of the second cell 56 of the adjacent battery group 48 on the front side of the paper in FIG. 5A (the right side of the paper in FIG. 6). This process is repeated thereafter. Therefore, in the first embodiment, all the cells 54, 56 are electrically connected in series. An equivalent circuit at this time is shown in FIG. 5B.

[0028] Returning to Fig. 3, a cooling jacket 72 serving as heat removal means is disposed above the stack 52. A refrigerant inlet pipe 74 and a refrigerant outlet pipe 76 extend from the cooling jacket 72, which also serves as part of the cooling equipment 36. The refrigerant outlet pipe 76 is connected to a refrigerant inlet pipe 74 of another battery module 30. That is, the cooling medium supplied to any one battery module 30 flows through the cooling jacket 72 attached to that battery module 30, and then moves to a cooling jacket 72 attached to another battery module 30 and flows through the cooling jacket 72.

[0029] As shown in FIG. 2, the battery module 30 is provided with a cooling facility 36 including a cooling jacket 72 housed in a casing 34. Specifically, a circulation supply pipe 78 is connected to a refrigerant inlet pipe 74 of the cooling jacket 72, which is the first to circulate the cooling medium, and a refrigerant outlet pipe 76 of the cooling jacket 72, which is the last to circulate the cooling medium. A circulation pump 80 and a cooling heat exchanger 82 are interposed in the circulation supply pipe 78, and the cooling medium is sent from the circulation supply pipe 78 to the refrigerant inlet pipe 74 by the circulation pump 80, and returns to the circulation supply pipe 78 via the refrigerant outlet pipe 76. The cooling medium that has returned to the circulation supply pipe 78 is cooled, for example, by the air that comes into contact with the cooling heat exchanger 82 while circulating through the cooling heat exchanger 82. After this cooling, the cooling medium is resupplied to the cooling jacket 72. When the battery module 30 (or the battery pack 33) becomes hot and is necessary to protect the single cells 40 and the battery module 30, the cooling medium is circulated and supplied to the cooling jacket 72 in this manner.

[0030] Fig. 6 also shows a vertical cross section of the cooling jacket 72. As shown in Fig. 6, a plurality of slits 84 are formed in the lower surface of the cooling jacket 72, and the upper end of the thermally conductive material 50 is inserted into the cooling jacket 72 through the slits 84. In this way, the thermally conductive material 50 is supported by the cooling jacket 72. It goes without saying that the gap between the slits 84 and the thermally conductive material 50 is sealed with a sealing material or the like. Also, the thermally conductive material 50 is joined to the cooling jacket 72 with brazing or the like.

[0031] The laminate 52 and the cooling jacket 72 are housed in a module case 86 having a hollow rectangular tube shape as shown in Fig. 3. This constitutes the battery module 30. An opening 88 is formed in each end surface of the module case 86 to prevent heat from building up inside.

[0032] The battery system 32 according to the first embodiment basically includes the battery module 30 configured as described above. As described above, a plurality of battery modules 30 are housed in a casing 34 to configure a battery pack 33. It goes without saying that the module case 86 is positioned and fixed to an inner wall (e.g., a bottom wall) of the casing 34 via bolts or the like. Next, the effects of the battery module 30 will be described.

[0033] The multicopter 10 shown in FIG. 1 can take off and fly by energizing the motor supplied with power from the battery pack 33. That is, the rotating shaft of the motor rotates, and the rotors of the props 20a-20c and 22a-22c rotate accordingly. This generates lift that makes the multicopter 10 rise or fly. In addition, the circulation pump 80 is energized, and the cooling medium is sequentially supplied to each battery module 30 from the circulation supply pipe 78 and the refrigerant inlet pipe 74. The cooling medium returns to the circulation supply pipe 78 via the refrigerant outlet pipe 76.

[0034] During takeoff and landing, high output is required from the motor. For this reason, a large power supply is required from the battery pack 33 (the first cell 54 and the second cell 56). That is, the required power becomes large, and a large current is discharged from the first cell 54 and the second cell 56. Furthermore, if a generator is mounted on the multicopter 10, surplus power is generated when the motor output is small. The first cell 54 and the second cell 56 are charged with this surplus power.

[0035] The first cell 54 and the second cell 56 are heated by this discharging and charging. As shown in Fig. 7, in the first cell 54 and the second cell 56, the amount of heat is maximum at the first ends 64f, 64s from which the positive electrode terminals 60f, 60s and the negative electrode terminals 62f, 62s protrude, and is minimum at the opposite second ends 66f, 66s. This causes a temperature difference between the first ends 64f, 64s, which are at a high temperature, and the second ends 66f, 66s, which are at a low temperature.

[0036] Here, in the first embodiment, the second end 66s of the second cell 56 abuts against the first end 64f of the first cell 54. Also, the second end 66f of the first cell 54 abuts against the first end 64s of the second cell 56. In this manner, in both the first cell 54 and the second cell 56, the second end 66s, 66f, which has a relatively small amount of heat and is at a low temperature, abuts against the first end 64f, 64s, which has a large amount of heat and is at a high temperature. Therefore, the heat of the first end 64f, 64s is transferred to the second end 66s, 66f abutting against the first end 64f, 64s.

[0037] As a result, the temperature of the first ends 64f, 64s decreases, while the temperature of the second ends 66s, 66f increases. This reduces the temperature difference between the first ends 64f, 64s and the second ends 66s, 66f. In other words, the heat can be equalized as much as possible in each of the first cells 54 and the second cells 56.

[0038] When the multicopter 10 transitions from normal flight to an emergency landing for some reason, it is assumed that the power required for the first cell 54 and the second cell 56 (battery pack 33) will be greater than during normal takeoff or landing. If the required power increases in a state where there is a large temperature difference between the individual first cell 54 and second cell 56, there is a concern that the temperature of the first cell 54 and the second cell 56 will rise excessively locally.

[0039] However, in the first embodiment, as described above, the temperature difference between the first cell 54 and the second cell 56 can be made as small as possible. Therefore, the concern that the temperature of the first cell 54 and the second cell 56 will rise excessively is eliminated. Thus, according to the first embodiment, the second end 66s of the second cell 56, which is relatively low temperature, is brought into contact with the first end 64f of the first cell 54, which is relatively high temperature, and the first end 64s of the second cell 56, which is relatively high temperature, is brought into contact with the second end 66f of the first cell 54, which is relatively low temperature. Therefore, the heat distribution of the first cell 54 and the second cell 56 in the battery pack 48 can be suppressed. As a result, even when a large amount of power is required, the temperature of the first cell 54 and the second cell 56 can be prevented from rising excessively.

[0040] Moreover, the heat of the first cell 54 and the second cell 56 is quickly conducted to the thermally conductive material 50 sandwiching the battery assembly 48. Furthermore, since the upper end of the thermally conductive material 50 is inserted into the cooling jacket 72, the heat conducted from the first cell 54 or the second cell 56 to the thermally conductive material 50 is quickly taken by the cooling medium circulating in the cooling jacket 72. The cooling medium, whose temperature has increased as a result of this, returns from the refrigerant outlet pipe 76 to the circulation supply pipe 78 under the action of the circulation pump 80, and further, while flowing through the cooling heat exchanger 82, transfers heat to the atmosphere, etc. Due to this heat transfer, the temperature of the cooling medium decreases. The cooling medium whose temperature has decreased is supplied again to the cooling jacket 72.

[0041] In this manner, heat is quickly removed from the first cell 54 and the second cell 56. In other words, the first cell 54 and the second cell 56 are quickly cooled. This also makes it possible to prevent the temperatures of the first cell 54 and the second cell 56 from rising excessively.

[0042] Therefore, there is no particular need to provide a large-scale cooling facility for the battery module 30. This is because, as described above, the heat of the first cell 54 and the second cell 56 can be sufficiently removed by the thermally conductive material 50 and the cooling jacket 72. This allows for simplification of the battery system 32 or the related facilities of the battery module 30. This improves the degree of freedom in the layout of the equipment in the multicopter 10. Another advantage is that the total weight of the multicopter 10 is reduced and power consumption is reduced.

[0043] Next, the battery module 100 constituting the battery system according to the second embodiment will be described with reference to Figures 8 to 11. Note that the same components as those shown in Figures 1 to 7 are given the same reference numerals, and detailed description thereof will be omitted.

[0044] 8 to 10 are respectively a partially exploded schematic perspective view, a schematic plan view, and a schematic front view of a stacked body 102 constituting a battery module 100. In this case, the stacked body 102 housed in a module case 86 (see FIG. 3) has a fin portion 106 of a cooling jacket 104 and a plurality of battery assemblies 48. In the battery assemblies 48 in the second embodiment, the second end 66f of the first cell 54 and the second end 66s of the second cell 56 abut against each other (see FIG. 9 in particular).

[0045] The first cells 54 of each battery group 48 are aligned, for example, with the positive terminal 60f facing downward and the negative terminal 62f facing upward. Meanwhile, the second cells 56 of each battery group 48 are aligned, for example, with the negative terminal 62s facing downward and the positive terminal 60s facing upward. As shown in Figs. 10 and 11A, the positive terminals 60f of the first cells 54 are electrically connected to each other via a bus bar 70. The negative terminal 62f of the first cell 54 and the positive terminal 60s of the second cell 56 are electrically connected to each other via the bus bar 70, and the negative terminals 62s of the second cells 56 are electrically connected to each other via the bus bar 70.

[0046] Therefore, in the second embodiment, the first cells 54 connected in parallel to each other and the second cells 56 connected in parallel to each other are connected in series. An equivalent circuit in this case is shown in FIG 11B.

[0047] In the second embodiment, the cooling jacket 104 has two plate-shaped portions 110, 112 through which the cooling medium flows. A refrigerant inlet pipe 74 is provided in the plate-shaped portion 110, and a refrigerant outlet pipe 76 is provided in the plate-shaped portion 112. A refrigerant relay pipe 114 bridges between the two plate-shaped portions 110, 112. The plate-shaped portions 110, 112 are spaced apart by the length of the refrigerant relay pipe 114.

[0048] Fin portions 106 functioning as thermal conductive materials are provided on the plate-shaped portions 110 and 112. As shown in FIG. 10, the lower ends of the fin portions 106 are connected to the plate-shaped portions 110 and 112, whereby the fin portions 106 are supported by the plate-shaped portions 110 and 112.

[0049] Therefore, the heat conducted from the first cell 54 or the second cell 56 to the fin portion 106 (thermal conductive material) is quickly absorbed by the cooling medium flowing inside the plate-shaped portions 110,112.

[0050] Here, a member integrally having the plate-shaped portion 110 (or the plate-shaped portion 112) and the fin portion 106 can be produced, for example, by extruding a workpiece made of an aluminum alloy. Then, the refrigerant inlet pipe 74 is provided in the plate-shaped portion 110, and the refrigerant outlet pipe 76 is provided in the plate-shaped portion 112. Furthermore, the plate-shaped portion 110 and the plate-shaped portion 112 are connected with the refrigerant relay pipe 114.

[0051] 9, the first end 64f of the first cell 54 of any battery set 48 and the first end 64f of the first cell 54 of the battery set 48 adjacent to the battery set 48 are spaced apart by the thickness of the second cell 56. Similarly, the first end 64s of the second cell 56 of any battery set 48 and the first end 64s of the second cell 56 of the battery set 48 adjacent to the battery set 48 are spaced apart by the thickness of the first cell 54. The fin portion 106 is inserted between the spaced apart first end portions 64f and between the spaced apart first end portions 64s and abuts against these first end portions 64f, 64s.

[0052] For this reason, in the second embodiment, the heat of the first ends 64f, 64s, which are relatively high temperature, is conducted to the fin portion 106. Therefore, the temperature of the first ends 64f, 64s drops. On the other hand, since the fin portion 106 does not contact the second ends 66f, 66s, which are relatively low temperature, the temperature of the second ends 66f, 66s does not drop significantly. Therefore, the temperature difference between the first ends 64f, 64s and the second ends 66f, 66s is reduced. That is, even in the second embodiment, the heat can be equalized as much as possible in each of the first cell 54 and the second cell 56.

[0053] In addition, since the cooling medium flows through the plate-shaped portions 110, 112, the heat of the fin portion 106 is quickly removed by the cooling medium. That is, in the second embodiment, too, the heat of the first cell 54 and the second cell 56 can be quickly removed.

[0054] For the reasons described above, the second embodiment also provides the same effects as the first embodiment.

[0055] The present invention is not particularly limited to the above-described embodiment, and various modifications are possible without departing from the spirit and scope of the present invention.

[0056] For example, the battery modules 30, 100 may be mounted on a flying object such as the multicopter 10, but may also be mounted on a land vehicle such as a four-wheeled vehicle or a two-wheeled vehicle, or on a water vehicle such as a ship. Also, the battery system 32 including the battery module 30 and the battery system including the battery module 100 may be a so-called stationary type.

[0057] Furthermore, the number of battery modules 30, 100 housed in the casing 34 is arbitrary, and may be one. [Explanation of symbols]

[0058] 10...Multicopter 20a~20c, 22a~22c...Prop 30, 100... Battery module 32... Battery system 33... Battery pack 34... Casing 36…Cooling equipment 48…Battery assembly 50...thermal conductive material 52, 102...laminated body 54...First cell 56...Second cell 58f…First body 58s…Second body 60f, 60s...Positive terminal 62f, 62s...Negative terminal 64f, 64s...first end 66f, 66s...second end 72, 104...cooling jacket 78...circulation supply pipe 80...Circulation pump 82...Cooling heat exchanger 106: Fin portion; 110, 112: Plate-shaped portion

Claims

1. A battery system including a battery module having a plurality of unit cells each having a positive terminal and a negative terminal extending in the same direction, a first body having a first end and a second end, a first cell having a positive electrode terminal and a negative electrode terminal extending from the first end in a first direction, and a second body having a first end and a second end, a second cell having a positive electrode terminal and a negative electrode terminal extending from the first end in a second direction opposite to the first direction, the second cell being adjacent to each other; In the battery assembly, at least a portion of the first body and the second body overlap and abut against each other, A thermally conductive material that conducts heat from the first cell or the second cell is in contact with the battery set, The battery system includes a cooling jacket that supports the thermally conductive material and removes heat from the thermally conductive material; A battery system in which one end of the thermally conductive material is inserted into the cooling jacket through a slit formed in the cooling jacket.

2. In the battery system according to claim 1, the thermal conductive material is provided in plurality, Each of the thermally conductive materials has the one end portion that protrudes beyond the battery assembly in a direction perpendicular to the first direction and the second direction, A battery system in which all of said one ends are inserted within said cooling jacket.

3. In the battery system according to claim 1 or 2, the battery set and the thermal conductive material are stacked to form a laminate, The thermally conductive material is disposed on each of both ends of the laminate in a lamination direction, The laminate is housed in a module case, A battery system in which the thermally conductive materials arranged at both ends face openings formed in the module case.

4. 4. The battery system according to claim 1, wherein the first end of the first body and the second end of the second body are in contact with each other and the second end of the first body and the first end of the second body are in contact with each other, and the first body and the second body are sandwiched between two pieces of the thermally conductive material.

5. A battery system including a battery module having a plurality of single cells whose positive and negative terminals extend in the same direction, a thermally conductive material that is in contact with the battery cell and conducts heat from the battery cell; a cooling jacket that supports the thermally conductive material and removes heat from the thermally conductive material; A battery system in which one end of the thermally conductive material is inserted into the cooling jacket through a slit formed in the cooling jacket.

6. A battery system including a battery module having a plurality of single cells whose positive and negative terminals extend in the same direction, a first body having a first end and a second end, a first cell having a positive electrode terminal and a negative electrode terminal extending from the first end in a first direction, and a second body having a first end and a second end, a second cell having a positive electrode terminal and a negative electrode terminal extending from the first end in a second direction opposite to the first direction, the second cell being adjacent to each other; In the battery assembly, at least a portion of the first body and the second body overlap and abut against each other, A thermally conductive material that conducts heat from the first cell or the second cell is in contact with the battery set, a battery system in which the second end of the first body and the second end of the second body abut each other, the thermally conductive material is sandwiched between the first end of the first body and the first end of the first body of the first cell of the adjacent battery set, and the thermally conductive material is sandwiched between the first end of the second body and the first end of the second body of the second cell of the adjacent battery set.

7. A flying object equipped with a battery system according to any one of claims 1 to 6.

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