JP6958393B2 - Battery pack - Google Patents

Description

The present disclosure relates to a battery pack mounted on a vehicle.

As a document in which a conventional battery pack is disclosed, for example, Japanese Patent Application Laid-Open No. 2006-196277 (Patent Document 1) can be mentioned. In the battery pack disclosed in Patent Document 1, a plurality of drain ports are provided at the bottom of the battery case accommodating the battery module, and the water that has entered the battery case is drained from the drain ports.

Japanese Unexamined Patent Publication No. 2006-196277

However, even when a plurality of drainage ports are provided at the bottom of the battery case as in the battery pack disclosed in Patent Document 1, it is difficult to drain all the water that has entered the battery case. The water in the part remains on the bottom of the battery case.

When the vehicle runs with water remaining on the bottom surface of the battery case, the water remaining on the bottom surface of the battery case bounces upward due to vibration, so that the battery module and the battery module are electrically charged. It may adhere to the connected electronic device or the like. In this case, there is a concern that the battery module may be short-circuited by the adhering water.

The present disclosure has been made in view of the above problems, and an object of the present disclosure is to provide a battery pack capable of suppressing splashing of liquid remaining in a battery case.

A battery pack based on the present disclosure includes a battery module including a plurality of stacked cells, an electronic device electrically connected to the battery module, and a battery case accommodating the battery module and the electronic device. In the battery case, there is an arrangement area in which the battery module and the electronic device are arranged, and a facing surface which is arranged apart from the battery module and the electronic device and faces the arrangement area from the lower side. Is provided, and the facing surface is subjected to hydrophilic treatment.

In the above configuration, when dew condensation water is generated inside the battery case due to the temperature difference between the inside and outside of the battery case, or when a liquid enters the battery case from the outside of the battery case, droplets are generated by its own weight. Move downwards. The water droplets moving downward reach the facing surface facing the arrangement area where the battery module and the electronic device are arranged from the lower side. By applying the hydrophilic treatment to the facing surface, the droplets that have reached the facing surface spread thinly on the facing surface, and the adhesion between the droplet and the facing surface is improved. As a result, the height of the droplet on the facing surface can be lowered, and the droplet can be suppressed from bouncing from the facing surface due to vibration. As a result, it is possible to prevent droplets from adhering to the battery module and the electronic device that are separated from the facing surface.

According to the present disclosure, it is possible to provide a battery pack capable of suppressing the splash of the liquid remaining in the battery case.

It is the schematic which shows the vehicle which mounted the battery pack which concerns on embodiment. It is an exploded perspective view of the battery pack which concerns on embodiment. It is sectional drawing of the battery pack which concerns on embodiment.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the embodiments shown below, the same or common parts are designated by the same reference numerals in the drawings, and the description thereof will not be repeated. Further, in each figure, the X-axis direction indicates the vehicle width direction, the Y-axis direction indicates the vehicle front-rear direction, and the Z-axis direction indicates the vehicle vertical direction.

FIG. 1 is a schematic view showing a vehicle equipped with the battery pack according to the embodiment. A vehicle 1 equipped with the battery pack 10 according to the embodiment will be described with reference to FIG.

The vehicle 1 is a vehicle equipped with an electric motor as a prime mover for driving a vehicle such as a hybrid vehicle and an electric vehicle. The vehicle 1 includes a battery pack 10. The battery pack 10 supplies electric power to the electric motor for driving the vehicle. On the other hand, the electric power generated by the electric motor due to regenerative braking or the like is charged in the battery pack 10. The battery pack 10 is provided, for example, between the rear seat 60 and the floor panel 70.

FIG. 2 is an exploded perspective view of the battery pack according to the embodiment. FIG. 3 is a cross-sectional view of the battery pack according to the embodiment. The battery pack 10 according to the embodiment will be described with reference to FIGS. 2 and 3.

As shown in FIG. 2, the battery pack 10 has a longitudinal shape in the vehicle width direction (X-axis direction) and a lateral direction in the vehicle front-rear direction (Y-axis direction). The battery pack 10 includes a plurality of battery modules 2, a battery case 15, and an electronic device 5. The number of battery modules 2 is not particularly limited. The battery module 2 may be singular.

The plurality of battery modules 2 are arranged side by side in the front-rear direction of the vehicle. The battery module 2 is configured by stacking a plurality of cell cells 3 in one direction. Note that stacking a plurality of battery modules 2 includes arranging a plurality of single batteries side by side at intervals in one direction. The plurality of cell cells 3 are arranged side by side in the vehicle width direction, for example.

The cell 3 is a secondary battery such as a nickel-metal hydride battery or a lithium-ion battery. The cell 3 has, for example, a square shape.

The electronic device 5 is electrically connected to a plurality of battery modules 2. The electronic device 5 is, for example, a junction box to which a control ECU for controlling a plurality of battery modules 2 and wiring from the plurality of battery modules 2 are connected. The electronic device 5 is arranged in front of the plurality of battery modules 2.

The battery case 15 houses a plurality of battery modules 2 and electronic devices 5 inside. The plurality of battery modules 2 and the electronic device 5 are supported by a support member (not shown), and are housed inside the battery case 15 in a state of being separated from the bottom portion 31, which will be described later.

The battery case 15 has, for example, a longitudinal shape in the vehicle width direction and a lateral direction in the vehicle front-rear direction. The battery case 15 includes an upper case 20 and a lower case 30.

The upper case 20 has a substantially box-shaped shape provided with an open space that is open downward. The upper case 20 includes a ceiling portion 21, a peripheral wall portion 22, and a flange portion 23. The ceiling portion 21 has a plate-like shape. The peripheral wall portion 22 is provided so as to extend downward from the peripheral edge of the ceiling portion 21. The collar portion 23 is provided so as to bend outward from the lower end side of the peripheral wall portion 22.

The lower surface 23a of the collar portion 23 is formed to be substantially flat. An annular groove (not shown) is provided on the lower surface 23a of the collar. The upper side of the seal member 40, which will be described later, is fitted into the groove portion 24.

The lower case 30 has a substantially box-shaped shape provided with an open space that is open upward. The lower case 30 includes a bottom portion 31, a peripheral wall portion 32, and a collar portion 33. The bottom portion 31 is provided so as to face the ceiling portion 21. A step 315, which will be described later, is formed on the inner surface 31a of the bottom portion 31. The peripheral wall portion 32 is provided so as to extend upward from the peripheral edge of the bottom portion 31. The collar portion 33 is provided so as to bend outward from the upper end side of the peripheral wall portion 32.

The upper surface 33a of the collar portion 33 is formed to be substantially flat. An annular recess 34 is provided on the upper surface 33a of the collar 33. The lower side of the seal member 40 is fitted into the recess 34.

The battery pack 10 includes a sealing member 40. The seal member 40 has an annular shape. The seal member 40 is fitted into the groove portion of the flange portion 23 of the upper case 20 and the recess 34 of the peripheral wall portion 32 of the lower case 30. The seal member 40 is made of, for example, an elastic rubber member.

The collar portion 23 and the collar portion 33 are fastened by a plurality of fastening members in a state where the lower surface 23a of the collar portion 23 and the upper surface 33a of the collar portion 33 are aligned. As a result, the upper case 20 and the lower case 30 are combined. The plurality of fastening members are arranged at intervals in the circumferential direction.

As shown in FIG. 3, a first region R1 (arrangement region) in which a plurality of battery modules 2 and electronic devices 5 are arranged and a cooling device for cooling the battery module 2 such as a blower are contained in the battery case 15. Is provided with a second region R2 in which the is arranged.

The first region R1 is located on the rear side in the battery case 30. The first region R1 is a region surrounded by the first member 310 of the lower case 30 and the upper case 20, which will be described later. The second region R2 is located on the front side in the battery case 30. The second region R2 is a region surrounded by the second member 320 of the lower case 30, which will be described later, and the upper case 20.

The lower case 30 has a first member 310 and a second member 320. The first member 310 constitutes the rear portion of the lower case 30, and the second member 320 constitutes the front portion of the lower case 30.

The first member 310 has an inclined surface 311a and a first mating surface 312. The inclined surface 311a constitutes the rear side of the inner surface 31a. The inclined surface 311a is inclined so that the height decreases from the rear to the front. The inclined surface 311a is separated from the plurality of battery modules 2 and the electronic device 5. The inclined surface 311a faces the first region R1 from the lower side. The inclined surface 311a is treated with hydrophilicity.

The first mating surface 312 is provided at the front end of the inclined surface 311a. The first mating surface 312 extends downward from the front end of the inclined surface 311a.

The second member 320 has a storage surface 321a and a second mating surface 322. The storage surface 321a constitutes the front side of the inner surface 31a. The storage surface 321a is located at a position lower than the front end of the inclined surface 311a. As a result, a step 315 is formed between the storage surface 321a and the inclined surface 311a, and a liquid such as dew condensation water, which will be described later, can be stored on the storage surface 321a.

The second mating surface 322 is provided at the rear end of the storage surface 321a. The second mating surface 322 extends upward from the rear end of the storage surface 321a. The second mating surface 322 faces the first mating surface 312.

The first member 310 and the second member 320 are fastened to the upper case 20 in a state where the first mating surface 312 and the second mating surface 322 are aligned.

Here, in the battery pack 10, when the temperature difference between the inside and outside of the battery case 15 causes dew condensation water (droplets) to be generated inside the battery case, drinking water is spilled inside the vehicle, or the battery pack 10 is opened in rainy weather. When a liquid such as rain enters the vehicle through the vehicle window, the liquid may enter the inside of the battery case 15 from the outside of the battery case 15.

When droplets are generated or invade into the battery case, the droplets move downward due to their own weight. The water droplets moving downward reach the inclined surface 311a facing the first region R1 in which the battery module and the electronic device are arranged from the lower side. Since the inclined surface 311a is subjected to the hydrophilic treatment, the droplets that have reached the inclined surface 311a spread thinly on the inclined surface 311a, and the adhesion between the droplets and the inclined surface 311a is improved. As a result, the height of the droplet on the inclined surface 311a can be lowered, and the droplet can be suppressed from bouncing from the inclined surface 311a due to vibration. As a result, it is possible to prevent droplets from adhering to the plurality of battery modules 2 and electronic devices that are separated from the inclined surface 311a.

Further, since the inclined surface 311a is inclined toward the storage surface 321a, the droplets that have reached the inclined surface 311a can be easily guided toward the storage surface 321a.

In addition, the lower case 30 is composed of the first member 310 and the second member 320, and the first member 310 and the second member 320 are fixed to the upper case 20 in a state where the first mating surface 312 and the second mating surface 322 are combined. When the liquid level of the liquid stored on the storage surface 321a exceeds the second mating surface 322, a slight amount of liquid is formed between the first mating surface 312 and the second mating surface 322. The liquid can be discharged from the gap.

In the above-described embodiment, the case where the rear portion of the bottom portion 31 is formed by the inclined surface 311a and is inclined so that the height is lowered from the rear side to the front side is illustrated, but the present invention is not limited to this. The rear portion of the bottom portion 31 may be configured flat. In this case, as long as the inner surface 31a is subjected to the hydrophilic treatment at the rear portion of the bottom portion 31, the splashing of the droplets remaining on the inner surface 31a can be suppressed.

In the above-described embodiment, the case where the facing surface is composed of a part of the inner surface 31a of the bottom portion 31 of the lower case 30 has been described as an example, but the present invention is not limited thereto. For example, a separate member is arranged between the plurality of battery modules 2 and the electronic device 5 and the bottom 31 so as to be separated from the plurality of battery modules 2 and the electronic device 5, and the first region R1 of the separate members is arranged. The surface facing from the lower side may function as the facing surface. When the inner surface 31a of the bottom portion 31 is used as a facing surface as in the embodiment, a separate member can be omitted, the number of parts can be reduced, and space can be saved. can.

In the above-described embodiment, the case where the electronic device 5 is arranged in front of the plurality of battery modules 2 has been illustrated, but the present invention is not limited to this, and the electronic device 5 may be arranged above the plurality of battery modules 2. , May be arranged behind the plurality of battery modules 2.

Although the embodiments of the present invention have been described above, the embodiments disclosed this time are exemplary in all respects and are not restrictive. The scope of the present invention is indicated by the claims and includes all modifications within the meaning and scope equivalent to the claims.

1 Vehicle, 2 Battery Module, 3 Single Battery, 5 Electronic Equipment, 10 Battery Pack, 15 Battery Case, 20 Upper Case, 21 Ceiling, 22 Peripheral Wall, 23 Collar, 23a Bottom, 24 Groove, 30 Lower Case, 31 Bottom , 31a inner surface, 32 peripheral wall part, 33 flange part, 33a upper surface, 34 recess, 40 seal member, 60 rear sheet, 70 floor panel, 310 first member, 311a inclined surface, 312 first mating surface, 315 step, 320 Second member, 321a storage surface, 322 second mating surface.

Claims (1)

A battery module containing multiple stacked cells and
An electronic device electrically connected to the battery module and
A battery case for accommodating the battery module and the electronic device is provided.
The battery case is provided with an arrangement area in which the battery module and the electronic device are arranged, and a facing surface which is arranged apart from the battery module and the electronic device and faces the arrangement area from the lower side. Be,
The facing surface is hydrophilically treated .
The battery case includes a lower case constituting the lower side of the battery case.
The lower case includes a first member having a first mating surface and the facing surface, and a second member having a second mating surface and a storage surface for storing a liquid.
The first mating surface is provided at one end of the facing surface.
The storage surface is arranged so as to be adjacent to the one end side of the facing surface when viewed from above.
The second mating surface is provided at the end of the storage surface located on the one end side of the facing surface.
A battery pack in which the first mating surface and the second mating surface are aligned so that liquid can be discharged from a gap between the first mating surface and the second mating surface.

Images