Battery cell

Abstract

The battery unit includes: a battery; a battery case that accommodates the battery; a front junction box that is provided on the front side in the front-rear direction of the vehicle and distributes power to the front motor; a rear junction box that is provided on the rear side in the front-rear direction and distributes power to the rear motor; a front bus bar that connects one of the positive electrode terminal and the negative electrode terminal of the battery and the front junction box; a rear bus bar that connects the other of the positive electrode terminal and the negative electrode terminal of the battery and the rear junction box; and a center bus bar connecting the front junction box and the rear junction box.

Description

Technical Field

[0001] The present invention relates to a battery unit provided on a vehicle. Background Art

[0002] In a vehicle, a scheme has been proposed in which electric connection boxes are provided before and after a battery, and power is supplied from the battery to the front motor via the front electric connection box, and power is supplied from the battery to the rear motor via the rear electric connection box (for example, Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2020-90234 Summary of the invention

[0006] Technical problem to be solved by the invention

[0007] In the above-mentioned vehicle, the positive terminal and the negative terminal of the battery are connected to one electrical connection box. In this case, for example, when the vehicle collides and the electrical connection box to which the positive terminal and the negative terminal are connected is damaged, the battery may be short-circuited.

[0008] Therefore, an object of the present invention is to reduce short circuits in batteries.

[0009] Technical solutions for solving technical problems

[0010] A battery unit according to one embodiment of the present invention includes: a battery; a battery casing that accommodates the battery; a front junction box that is arranged on the front side in the front-to-rear direction of the vehicle and distributes power to the front motor; a rear junction box that is arranged on the rear side in the front-to-rear direction and distributes power to the rear motor; a front bus bar that connects one of the positive terminal and the negative terminal of the battery to the front junction box; a rear bus bar that connects the other of the positive terminal and the negative terminal of the battery to the rear junction box; and a center bus bar that connects the front junction box and the rear junction box.

[0011] Effects of the Invention

[0012] The present invention can reduce the short circuit of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a diagram showing the structure of a vehicle.

[0014] Figure 2 It is an exploded perspective view illustrating the structure of a battery module.

[0015] Figure 3It is a diagram for explaining the structure of the front junction box and the rear junction box.

[0016] Figure 4 It is a diagram for explaining the electrical structure of the front junction box and the rear junction box.

[0017] Figure 5 This diagram illustrates the connection relationship between the center bus, the system main relay, and the front junction box.

[0018] Figure 6 It is a diagram for explaining a modified example of the connection relationship between the center bus bar and the front terminal box. DETAILED DESCRIPTION

[0019] <1. Overview of vehicle structure>

[0020] Figure 1 1 is a diagram showing the structure of the vehicle 1. In the following description, the front-rear direction of the vehicle 1 is simply referred to as the front-rear direction. In addition, the left-right direction of the vehicle 1 is simply referred to as the left-right direction.

[0021] like Figure 1 As shown, the vehicle 1 is an electric vehicle including a battery module 2 , a front motor 3 , a front inverter 4 , a rear motor 5 , and a rear inverter 6 .

[0022] The battery module 2 is disposed, for example, in the center of the front-rear direction and under the floor. The battery module 2 is described in detail below and includes a battery 11 , a front junction box 12 , a rear junction box 13 , and an electrical device 14 .

[0023] The battery 11 can store electric power (electricity) to be supplied to the front motor 3 and the rear motor 5 .

[0024] The front junction box 12 is connected to the battery 11 and the front inverter 4 , and distributes the electric power from the battery 11 to the front motor 3 via the front inverter 4 .

[0025] The rear junction box 13 is connected to the battery 11 and the rear inverter 6 , and distributes the electric power from the battery 11 to the rear motor 5 via the rear inverter 6 .

[0026] The electric device 14 is, for example, a DCDC converter that generates a voltage of 100 V, or an OBC (On Board Charger) that can be connected to an external charging device, and is connected to the battery 11 .

[0027] The front motor 3 and the rear motor 5 are power sources for driving the vehicle 1 , and are, for example, three-phase AC motors.

[0028] The front motor 3 is connected to the front wheels. When electric power is supplied from the battery 11 via the front junction box 12 and the front inverter 4, the front motor 3 generates driving force, and transmits the driving force to the front wheels to rotate the front wheels.

[0029] The rear motor 5 is connected to the rear wheels. When electric power is supplied from the battery 11 via the rear junction box 13 and the rear inverter 6, the rear motor 5 generates driving force, and transmits the driving force to the rear wheels to rotate the rear wheels.

[0030] The front motor 3 and the rear motor 5 generate electricity (power) by performing regenerative operation. The electricity generated by the regenerative operation of the front motor 3 and the rear motor 5 is supplied to the battery 11 via the front inverter 4 and the rear inverter 6, respectively, to charge the battery 11.

[0031] The front inverter 4 converts the DC current supplied by the battery 11 into a three-phase AC current and supplies it to the front motor 3. In addition, when the front motor 3 performs regenerative operation, the front inverter 4 converts the AC current supplied by the front motor 3 into a DC current and supplies it to the battery 11, thereby charging the battery 11.

[0032] The rear inverter 6 converts the DC current supplied by the battery 11 into a three-phase AC current and supplies it to the rear motor 5. In addition, when the rear motor 5 performs regenerative operation, the rear inverter 6 converts the AC current supplied by the rear motor 5 into a DC current and supplies it to the battery 11, thereby charging the battery 11.

[0033] <2. Structure of battery module 2>

[0034] Figure 2 2 is an exploded perspective view illustrating the structure of the battery module 2. Figure 2 As shown, the battery module 2 includes a battery housing 15 , a front bus bar 16 , a rear bus bar 17 and a center bus bar 18 in addition to the battery 11 , the front junction box 12 , the rear junction box 13 and the electrical device 14 .

[0035] The battery housing 15 includes a battery tray 21 and a battery cover 22 .

[0036] The battery tray 21 is formed of, for example, an iron material or an aluminum material. The battery tray 21 is integrally formed with a flat bottom 21a as a bottom and a frame portion 21b protruding upward from the bottom 21a in a substantially rectangular frame shape. The space surrounded by the bottom 21a and the frame portion 21b serves as a storage space for storing the battery 11.

[0037] The battery cover 22 is formed of, for example, a resin material or an aluminum material. The battery cover 22 is integrally formed with a flat ceiling portion 22a serving as a ceiling and a frame portion 22b protruding downward from the ceiling portion 22a in a substantially rectangular frame shape.

[0038] The battery case 15 covers the frame 21b of the battery tray 21 in a space surrounded by the ceiling 22a and frame 22b of the battery cover 22. That is, the battery case 15 covers the battery 11 with the battery tray 21 and the battery cover 22, so that the battery 11 is not exposed to the outside.

[0039] Here, the battery 11 is composed of a plurality of battery cells 23. The battery cells 23 are, for example, lithium-ion batteries, and can be repeatedly charged and discharged for use.

[0040] The battery cells 23 are formed into a substantially rectangular parallelepiped and arranged in the front-rear and left-right directions in the battery case 15. The vertical length of the battery cells 23, that is, the height of the battery cells 23 is substantially the same as the vertical length of the frame portion 21b of the battery tray 21.

[0041] The battery cells 23 disposed in the battery case 15 are connected in series to adjacent battery cells 23. Thus, the battery 11 can supply high voltage power of, for example, 200V or 400V.

[0042] Among the plurality of battery cells 23 connected in series, the battery cell 23 arranged most positively in the series direction is provided with a positive terminal 24. Also, among the plurality of battery cells 23 connected in series, the battery cell 23 arranged most negatively in the series direction is provided with a negative terminal 25.

[0043] The positive electrode terminal 24 and the negative electrode terminal 25 are provided on the battery cell 23 so as to protrude upward.

[0044] A through hole (not shown) is formed in the ceiling portion 22 a of the battery cover 22 at a position facing the positive electrode terminal 24 and the negative electrode terminal 25 .

[0045] When the battery cell 23 is housed in the battery case 15 , the positive electrode terminal 24 and the negative electrode terminal 25 pass through the through hole formed in the ceiling portion 22 a of the battery cover 22 and protrude upward from the ceiling portion 22 a .

[0046] A front junction box 12 , a rear junction box 13 , an electric device 14 , a front bus bar 16 , a rear bus bar 17 , and a center bus bar 18 are provided on the ceiling portion 22 a .

[0047] The front terminal box 12 is disposed on the front side of the ceiling portion 22 a in the front-rear direction and in the center in the left-right direction. At this time, the front terminal box 12 is disposed so as to be entirely accommodated inside the outer edge of the battery case 15 .

[0048] The rear terminal box 13 is disposed at the rear side of the ceiling portion 22 a in the front-rear direction and at the center in the left-right direction. At this time, the rear terminal box 13 is disposed so as to be entirely accommodated inside the outer edge of the battery case 15 .

[0049] Front busbar 16 is disposed in the left-right direction at the front side of the front-rear direction of ceiling 22a so that both ends are connected to positive terminal 24 protruding upward from ceiling 22a and front junction box 12. Front busbar 16 is insulated from the outside by being covered with resin material, for example.

[0050] The rear bus bar 17 is arranged in the left-right direction at the rear side of the ceiling 22a in the front-rear direction so that both ends are connected to the negative terminal 25 protruding upward from the ceiling 22a and the rear terminal box 13. The rear bus bar 17 is insulated from the outside by being covered with a resin material, for example.

[0051] The central bus bar 18 is composed of a positive-side central bus bar 18 a and a negative-side central bus bar 18 b .

[0052] The positive-side central busbar 18a and the negative-side central busbar 18b are arranged in the front-back direction at the center of the left-right direction of the ceiling portion 22a in a manner that both ends are connected to the front terminal box 12 and the rear terminal box 13. In addition, the positive-side central busbar 18a and the negative-side central busbar 18b are insulated from the outside by being covered with a resin material, for example. In addition, the positive-side central busbar 18a and the negative-side central busbar 18b are arranged substantially in parallel with each other at a predetermined distance.

[0053] The electric device 14 is located at the center of the ceiling 22a in the front-rear direction and the left-right direction, and is disposed on the central bus bar 18 via the cooling plate 26. The electric device 14 is described in detail below, and is connected to the positive central bus bar 18a and the negative central bus bar 18b.

[0054] The cooling plate 26 has a structure in which a cooling medium flows, for example, and cools the electric device 14 arranged on the upper portion. In addition, the cooling plate 26 is arranged to abut against the central bus bar 18, so that the central bus bar 18 is also cooled.

[0055] Figure 3 1 is a diagram for explaining the structure of the front junction box 12 and the rear junction box 13. Figure 3 In the figure, only a part of the structure of the battery module 2 is shown, and a part of the structure of the front junction box 12 and the rear junction box 13 is omitted in the figure.

[0056] like Figure 3 As shown, the front junction box 12 includes a system main relay 31 , a first front internal bus bar 32 , a second front internal bus bar 33 , a third front internal bus bar 34 , fastening components 35 , 36 , 37 , and connectors 38 , 39 .

[0057] One end of the first front internal bus bar 32 is connected to the front bus bar 16 via a fastening member 35 , and the other end is connected to the system main relay 31 .

[0058] The second front internal bus bar 33 is formed to branch in three directions, with a first end connected to the system main relay 31, a second end connected to the positive electrode side center bus bar 18a via a fastening member 36, and a third end connected to the connector 38. In addition, the first front internal bus bar 32 and the second front internal bus bar 33 can be electrically connected via the system main relay 31.

[0059] One end of the third front internal bus bar 34 is connected to the negative electrode side center bus bar 18 b via a fastening member 37 , and the other end is connected to a connector 39 .

[0060] The system main relay 31 is configured to be able to electrically connect and disconnect the positive electrode terminal 24 of the battery 11 and the second front internal bus bar 33 which are connected via the front bus bar 16 , the fastening member 35 , and the first front internal bus bar 32 .

[0061] The fastening members 35 , 36 , and 37 are formed of bolts and nuts made of, for example, conductive metal members, and fasten the pair of bus bars.

[0062] The connectors 38 and 39 are connected to the front inverter 4 .

[0063] The rear junction box 13 includes a system main relay 41 , a first rear internal bus bar 42 , a second rear internal bus bar 43 , a third rear internal bus bar 44 , fastening components 45 , 46 , 47 , and connectors 48 , 49 .

[0064] One end of the first rear internal bus bar 42 is connected to the rear bus bar 17 via a fastening member 45 , and the other end is connected to the system main relay 41 .

[0065] The second rear internal bus bar 43 is formed to branch in three directions, with a first end connected to the system main relay 41, a second end connected to the negative-side center bus bar 18b via a fastening member 46, and a third end connected to the connector 48. In addition, the first rear internal bus bar 42 and the second rear internal bus bar 43 can be electrically connected in the system main relay 41.

[0066] One end of the third rear internal bus bar 44 is connected to the positive electrode side central bus bar 18 a via a fastening member 47 , and the other end is connected to a connector 49 .

[0067] The system main relay 41 is configured to be able to electrically connect and disconnect the negative electrode terminal 25 of the battery 11 connected via the rear bus bar 17 , the fastening member 45 , and the first rear internal bus bar 42 and the second rear internal bus bar 43 .

[0068] The fastening members 45 , 46 , and 47 are formed of bolts and nuts made of, for example, conductive metal members, and fasten the pair of bus bars.

[0069] Connectors 48 and 49 are connected to the rear inverter 6 .

[0070] The electric device 14 is provided with connectors 61 and 62. The electric device 14 is connected to the positive electrode side central bus bar 18a via the connector 61, and is connected to the negative electrode side central bus bar 18b via the connector 62.

[0071] As a result, the battery 11 and the electric device 14 can be connected without newly providing an electric wiring for connecting the battery 11 and the electric device 14, and the number of components can be reduced, and the size can be reduced.

[0072] Figure 4 FIG. 1 is a diagram illustrating the electrical structure of the front junction box 12 and the rear junction box 13. Figure 4 In FIG. 1 , only a part of the structure of the battery module 2 is shown. Figure 4 In the figure, for convenience of explanation, the positive electrode side central bus bar 18a and the negative electrode side central bus bar 18b are intersected in the middle.

[0073] like Figure 4 As shown, the front junction box 12 includes a fuse 40 in addition to the system main relay 31. The system main relay 31 and the fuse 40 are connected in series between the first front internal bus 32 and the second front internal bus 33.

[0074] The system main relay 31 can electrically connect and disconnect the first front internal bus 32 and the second front internal bus 33 , and is controlled by an ECU (Electronic Control Unit) not shown.

[0075] When an overcurrent flows, the fuse 40 breaks, thereby disconnecting the first front internal bus bar 32 and the second front internal bus bar 33 .

[0076] The rear junction box 13 includes a relay 50 , a resistor 51 , and an ammeter 52 in addition to the system main relay 41 .

[0077] The system main relay 41 and the relay 50 are connected in parallel between the first rear internal bus 42 and the second rear internal bus 43 .

[0078] The resistor 51 is connected in series with the relay 50 , and is connected in parallel with the system main relay 41 .

[0079] The ammeter 52 is disposed on the first rear internal bus 42 side relative to the system main relay 41 , the relay 50 , and the resistor 51 , and measures the current value of the current flowing through the first rear internal bus 42 .

[0080] The system main relay 41 and the relay 50 can electrically connect and disconnect the first rear internal bus 42 and the second rear internal bus 43 , and are controlled by an ECU (not shown).

[0081] The ECU electrically connects the first front internal bus 32 and the second front internal bus 33 by turning on the system main relay 31. In addition, the ECU electrically connects the first rear internal bus 42 and the second rear internal bus 43 by turning on the system main relay 41. In addition, the ECU electrically connects the first rear internal bus 42 and the second rear internal bus 43 via the resistor 51 by turning on the relay 50.

[0082] Thus, the positive terminal 24 of the battery 11 is connected to the front motor 3 via the front bus 16, the fastening member 35, the first front internal bus 32, the system main relay 31, the second front internal bus 33, the connector 38, and the front inverter 4. In addition, the negative terminal 25 of the battery 11 is connected to the front motor 3 via the rear bus 17, the fastening member 45, the first rear internal bus 42, the system main relay 41, the second rear internal bus 43, the fastening member 46, the negative-side center bus 18b, the fastening member 37, the third front internal bus 34, the connector 39, and the front inverter 4. Thus, the electric power from the battery 11 is supplied to the front motor 3.

[0083] In addition, the positive terminal 24 of the battery 11 is connected to the rear motor 5 via the front bus 16, the fastening member 35, the first front internal bus 32, the system main relay 31, the second front internal bus 33, the fastening member 36, the positive-side center bus 18a, the fastening member 47, the third rear internal bus 44, the connector 49, and the rear inverter 6. In addition, the negative terminal 25 of the battery 11 is connected to the rear motor 5 via the rear bus 17, the fastening member 45, the first rear internal bus 42, the system main relay 41, the second rear internal bus 43, the connector 48, and the rear inverter 6. Thus, the power from the battery 11 is supplied to the rear motor 5.

[0084] In the battery module 2 , the battery 11 and the electric device 14 can be electrically connected similarly.

[0085] On the other hand, when the voltage value measured by the ammeter 52 is above a predetermined threshold value, or when a collision of the vehicle 1 is detected, the ECU disconnects the system main relay 31 to electrically disconnect the first front internal bus 32 and the second front internal bus 33. In addition, the ECU disconnects the system main relay 41 and the relay 50 to electrically connect the first rear internal bus 42 and the second rear internal bus 43. Thus, the ECU disconnects the front motor 3, the rear motor 5, and the electric device 14 from the battery 11.

[0086] Figure 5 1 is a diagram for explaining the connection relationship between the center bus 18, the system main relay 31, and the front junction box 12. Figure 5 , a part of the structure of the front junction box 12 and the electric device 14 and the positive electrode side center bus 18a are shown, and other structures are omitted.

[0087] like Figure 5 As shown, the central bus bar 18 (in the figure, the positive-side central bus bar 18a) is arranged in close contact with the upper surface of the ceiling portion 22a. In this case, for example, one end of the positive-side central bus bar 18a is inserted until the second end of the second front internal bus bar 33 in the front terminal box 12. In addition, one end of the positive-side central bus bar 18a and the second end of the second front internal bus bar 33 are fastened and electrically connected by the fastening member 36.

[0088] Thus, in the battery module 2, the heat generated by the system main relay 31 can be transferred to the positive electrode side central bus bar 18a. Furthermore, since the positive electrode side central bus bar 18a is in close contact with the battery cover 22 (ceiling portion 22a), when the battery cover 22 is formed of a material with high thermal conductivity (for example, aluminum), the heat generated by the system main relay 31 can be dissipated to the battery cover 22.

[0089] In addition, the cooling plate 26 is disposed so as to abut against the central bus bar 18 . Thus, the cooling plate 26 can cool not only the electric device 14 but also the central bus bar 18 .

[0090] <3. Modifications>

[0091] The above embodiment is an example for carrying out the present invention, and the implementation of the present invention is not limited to the above example, and various modifications are conceivable.

[0092] For example, in the above embodiment, the front junction box 12 and the positive terminal 24 of the battery 11 are connected by the front bus bar 16. However, the front junction box 12 and the negative terminal 25 of the battery 11 may be connected by the front bus bar 16. In this case, the negative terminal 25 needs to be provided on the front side.

[0093] In the above embodiment, the rear junction box 13 and the negative terminal 25 of the battery 11 are connected by the rear bus bar 17. However, the rear junction box 13 and the positive terminal 24 of the battery 11 may be connected by the rear bus bar 17. In this case, the positive terminal 24 needs to be provided on the rear side.

[0094] In the above embodiment, the central busbar 18 is disposed on the upper surface of the ceiling portion 22a. Figure 6 As shown, the central bus bar 18 may also be arranged in close contact with the lower surface of the ceiling portion 22a. In this case, for example, inside the battery case 15, the positive electrode side central bus bar 18a is arranged so that one end is located directly below the second end of the second front internal bus bar 33 in the front junction box 12. And, by inserting the fastening member 36 into the through hole 22c formed in the ceiling portion 22a, one end of the positive electrode side central bus bar 18a is fastened and electrically connected to the second end of the second front internal bus bar 33.

[0095] Therefore, with Figure 5 As in the case shown, the heat generated by the system main relay 31 can be dissipated to the battery cover 22. In addition, even if an external force is applied to the battery module 2 due to, for example, a collision of the vehicle 1, the center bus bar 18 is accommodated in the battery case 15, so that the possibility of deformation or damage of the center bus bar 18 can be reduced.

[0096] <4. Conclusion>

[0097] As described above, the battery module 2 of the embodiment includes: a battery 11; a battery casing 15, which accommodates the battery 11; a front junction box 12, which is arranged on the front side in the front-to-rear direction of the vehicle 1 and distributes power to the front motor 3; a rear junction box 13, which is arranged on the rear side in the front-to-rear direction and distributes power to the rear motor 5; a front bus bar 16, which connects one of the positive terminal 24 and the negative terminal 25 of the battery 11 to the front junction box 12; a rear bus bar 17, which connects the other of the positive terminal 24 and the negative terminal 25 of the battery 11 to the rear junction box 13; and a center bus bar 18, which connects the front junction box 12 and the rear junction box 13.

[0098] Thus, in the battery module 2 , the positive electrode terminal 24 and the negative electrode terminal 25 of the battery 11 are connected to the front junction box 12 and the rear junction box 13 , respectively.

[0099] That is, in the battery module 2 , the positive electrode and the negative electrode of the battery 11 are connected to different junction boxes.

[0100] Therefore, even if any bus bar is deformed or damaged due to a collision or the like, it is difficult to form a circuit in which the positive electrode and the negative electrode of the battery 11 are connected, so the battery module 2 can reduce the possibility of a short circuit in the battery 11 .

[0101] In addition, since the front junction box 12 and the rear junction box 13 are arranged separately in the front-rear direction, the possibility of simultaneous damage due to collision, etc. is low. Furthermore, even if the front bus bar 16 is pressed into the front junction box 12 due to collision, etc., the circuit is cut off by the rear junction box 13 (system main relay 41, relay 50) on the other side, so the battery module 2 can reduce the possibility of short circuit of the battery 11.

[0102] The front junction box 12 , the rear junction box 13 , the front bus bar 16 , the rear bus bar 17 , and the center bus bar 18 are arranged on the ceiling portion 22 a of the battery case 15 .

[0103] Since the battery case 15 is made strong enough to withstand collisions and the like, by arranging these structures on the ceiling portion 22 a , the possibility of these structures being deformed or damaged by external forces such as collisions can be reduced.

[0104] Therefore, the battery module 2 can further reduce the possibility of short circuit of the battery 11 .

[0105] The front terminal box 12 and the rear terminal box 13 are arranged so as to be entirely accommodated inside the outer edge of the battery case 15 .

[0106] Thus, when an external force such as a collision is applied, the front terminal box 12 and the rear terminal box 13 are protected by the battery case 15 which is made strong.

[0107] Therefore, the battery module 2 can further reduce the possibility of short circuit of the battery 11 .

[0108] The center generatrix 18 is disposed on the ceiling portion 22 a at the center of the vehicle 1 in the left-right direction.

[0109] Thus, the center bus bar 18 can reduce the possibility of deformation or damage due to collision or the like, and can connect the front terminal box 12 and the rear terminal box 13 with the shortest distance.

[0110] The battery module 2 includes: an electric device 14 disposed on a central bus bar 18 ; and a cooling plate 26 disposed between the central bus bar 18 and the electric device 14 to cool the electric device 14 .

[0111] Thus, the heat generated in the front terminal box 12 and the rear terminal box 13 can be cooled by the cooling plate 26 via the central bus bar 18. Furthermore, by cooling with the cooling plate 26, the expansion of the cross-sectional area of ​​the central bus bar 18 can be suppressed, and the front terminal box 12 and the rear terminal box 13 can be miniaturized.

[0112] Explanation of symbols

[0113] 1 Vehicle

[0114] 2 battery modules

[0115] 3Front motor

[0116] 5 rear motor

[0117] 11. Battery

[0118] 12 front junction box

[0119] 13 Rear junction box

[0120] 14Electrical devices

[0121] 15Battery housing

[0122] 16 front bus

[0123] 17 rear busbar

[0124] 18 center busbars.

Claims

1. A battery cell, comprising: Battery; A battery housing for housing the battery; a front junction box which is disposed on the front side in the front-rear direction of the vehicle and distributes electric power to the front motor; a rear junction box disposed at the rear side in the front-rear direction and distributing electric power to the rear motor; A front busbar, connecting one of the positive terminal and the negative terminal of the battery to the front junction box; a rear bus bar connecting the other of the positive terminal and the negative terminal of the battery to the rear junction box; and A central busbar connects the front junction box and the rear junction box.

2. The battery cell according to claim 1, wherein: The front junction box, the rear junction box, the front bus bar, the rear bus bar, and the center bus bar are arranged on the ceiling of the battery housing.

3. The battery cell according to claim 2, wherein: The front junction box and the rear junction box are arranged so as to be completely accommodated inside the outer edge of the battery case.

4. The battery cell according to claim 2, wherein: The central generatrix is ​​disposed at the center of the ceiling portion in the left-right direction of the vehicle.

5. The battery cell according to claim 2, comprising: An electrical device, which is arranged on the central bus; as well as A cooling plate is arranged between the central bus bar and the electrical device to cool the electrical device.

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