JP2019106319A - Battery pack - Google Patents

Abstract

To provide a battery pack capable of controlling a temperature of a cell with simple constitution.SOLUTION: A battery pack 10 according to the present invention is provided with a battery pack under 30 below a battery pack lower 16 of a battery pack body 12, and a cooling liquid flows in the battery pack under 30. A hole part 28 is provided in a bottom plate 26 of the battery pack lower 16, and a cell 22 is arranged on a sheet member 28 arranged inside the hole part 28. The battery pack under 30 is formed of aluminum allow, so the cell 22 can be efficiently cooled. Consequently, constitution can be simplified.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a battery pack capable of adjusting the temperature of a cell.

  Patent Document 1 below discloses a configuration in which air is allowed to flow between adjacent single cells by operating a blower fan to thereby adjust the temperature of the single cells. In such a configuration, it is necessary to provide a duct, a chamber, and the like between the battery composed of a plurality of single cells and the blower fan. In addition, in order to cool the unit cells efficiently, the configuration, such as the arrangement of the duct and the chamber, becomes complicated.

Japanese Patent Laid-Open No. 2014-7019

  An object of the present invention is to obtain a battery pack capable of adjusting the temperature of a cell with a simple configuration in consideration of the above-mentioned facts.

  The battery pack according to claim 1 is formed of a battery pack upper made of a synthetic resin and iron or an alloy containing iron, provided on the lower side of the battery pack upper, and joined to the battery pack upper. A battery pack lower having a substantially box-shaped battery pack main body, a cell disposed inside the battery pack main body, and a bottom of the battery pack lower facing the bottom of the battery pack lower A battery pack lower connected to at least one of the battery pack upper and the battery pack lower and made of an aluminum alloy and in which a liquid temperature control liquid flows inside.

  According to the battery pack of the present invention, the temperature control solution flows through the inside of the battery pack under provided on the lower side of the battery pack lower of the battery pack body, whereby the temperature of the battery pack under is adjusted, and The temperature of the cells in the battery pack body is adjusted. Here, the battery pack under is formed of an aluminum alloy. Thus, the thermal conductivity of the battery pack under is, for example, higher than the thermal conductivity of iron. For this reason, the temperature control solution flows inside the battery pack under, and the temperature of the battery pack under is efficiently controlled. As a result, the temperature of the cell in the battery pack main body can be adjusted only by providing the battery pack under at the lower side of the battery pack lower of the battery pack main body, and the cell temperature can be adjusted with a simple configuration.

  As described above, in the battery pack according to claim 1, the cell temperature can be adjusted with a simple configuration.

FIG. 1 is an exploded perspective view of a battery pack according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1; Fig. 3 is a cross-sectional view taken along line 3-3 of Fig. 2;

  Next, an embodiment of the present invention will be described based on FIGS. 1 to 3. In each of the drawings, the arrow FR indicates the front side in the front-rear direction of the battery pack 10 according to the embodiment of the present invention, the arrow LH indicates the left side in the left-right direction of the battery pack 10, and the arrow UP indicates the front of the battery pack 10 The upper side in the vertical direction and the upper side in the vertical direction of the vehicle to which the battery pack 10 is applied are shown.

<Configuration of the present embodiment>
As shown in each of FIGS. 1 to 3, the battery pack 10 includes a battery pack body 12. The battery pack body 12 is configured to include a battery pack upper 14 and a battery pack lower 16. The battery pack upper 14 is in the form of a box opened downward. The battery pack upper 14 is made of a synthetic resin material, and the thickness dimension of the battery pack upper 14 is, for example, 2 mm. Furthermore, the battery pack upper 14 is provided with an upper flange 18. The upper flange 18 extends from the lower end of the battery pack upper 14 to the outside of the battery pack upper 14 orthogonal to the vertical direction.

  On the other hand, the battery pack lower 16 is in the shape of a box opened upward. The battery pack lower 16 is made of iron or an alloy containing iron, and the thickness dimension of the battery pack lower 16 is, for example, 1.5 mm. Furthermore, the battery pack lower 16 is provided with the lower flange 20. The lower flange 20 extends from the upper end of the battery pack lower 16 to the outside of the battery pack lower 16 orthogonal to the vertical direction. The lower flange 20 is vertically opposed to the upper flange 18 of the battery pack upper 14, and the battery pack lower 16 and the battery pack upper 14 are assembled by fastening the lower flange 20 and the upper flange 18 to each other by fastening means such as bolts. Are linked together.

  A plurality of cells 22 are accommodated inside the battery pack body 12. These cells 22 are arranged side by side in the front-rear direction, the left-right direction, and the up-down direction (in FIG. 3, only the cells 22 on the center side in the front-rear direction inside the battery pack body 12 are illustrated. The illustration of the side cell 22 is omitted). These cells 22 are electrically connected to each other, and thereby obtain a constant output (voltage, current) as the battery pack 10.

  The battery pack body 12 is provided with a connector (not shown). The connector of the battery pack body 12 is electrically connected to the control device via an electrical connection member such as a harness, and further, for example, a motor as a drive device for a vehicle via the control device (all not shown) Electrically connected to). Furthermore, a hole 26 is formed in the bottom plate 24 which is the bottom portion of the battery pack lower 16 and the bottom portion of the battery pack body 12. The hole 26 is, for example, a rectangular shape similar to the inner peripheral shape of the battery pack lower 16.

  In addition, the battery pack 10 includes a sheet member 28. The sheet member 28 is in the form of a sheet, and the thickness dimension of the sheet member 28 is, for example, 5 mm. The sheet member 28 is disposed inside the hole 26 of the battery pack lower 16, and the cells 22 described above are disposed on the sheet member 28. The thermal conductivity of the sheet member 28 is, for example, higher than the thermal conductivity of iron, and more preferably higher than the thermal conductivity of the material forming the battery pack under 30 described later.

  Furthermore, the battery pack 10 is provided with a battery pack under 30. The battery pack under 30 is in the shape of a box opened upward. Also, the battery pack under 30 is formed of an aluminum alloy, and the thermal conductivity of the battery pack under 30 is higher than the thermal conductivity of iron. The thickness dimension of the battery pack under 30 is, for example, 10 mm. The battery pack lower 16 of the battery pack main body 12 is disposed inside the battery pack lower 30, and the bottom plate 24 of the battery pack lower 16 (battery pack main 12) and the bottom 32 of the battery pack lower 30 are fastened by fastening means such as bolts. The battery pack lower 16 (battery pack main body 12) and the battery pack lower 30 are integrally connected by being mutually fastened.

  Further, as shown in FIGS. 2 and 3, a hollow flow passage 34 is formed in the bottom portion 32 of the battery pack lower 30. The flow path 34 is provided at a portion vertically opposed to the hole 26 of the battery pack lower 16. Inside the flow path 34, a plurality of middle walls 36 are provided. The longitudinal direction of the middle wall 36 is the front-rear direction, and the width direction of the middle wall 36 is the vertical direction. The widthwise upper end of the middle wall 36 is connected to the upper side surface of the bottom 32 in the flow channel 34, and the lower widthwise end of the middle wall 36 is connected to the lower surface of the bottom 32 in the flow channel 34.

  As a result, in the installation range of the middle wall 36 in the flow channel 34, the flow channel 34 is divided into a plurality in the left-right direction. Thus, by providing the middle wall 36 inside the flow path 34, the mechanical strength and the like of the bottom portion 32 to the load from the vertical direction side to the bottom portion 32 of the battery pack under 30 is improved. In the flow path 34 of the bottom portion 32 of the battery pack under 30, a liquid coolant (not shown) as a temperature control liquid flows from the front side to the rear side in the flow path 34.

  Further, as shown in FIG. 1 and FIG. 3, an inflow portion 38 is provided on the front side of the battery pack under 30, and an outflow portion 40 is provided on the back side of the battery pack under 30. When the inflow portion 38 and the outflow portion 40 are viewed from the front-rear direction side of the battery pack 10, the inflow portion 38 and the outflow portion 40 are formed in a flat cylindrical shape whose longitudinal direction extends in the left-right direction. The inner side of the inflow portion 38 is connected to the flow path 34 of the bottom portion 32 of the battery pack lower 30 via the rear end of the inflow portion 38, and the flow path 34 is It is connected to the front side of the part 38). The inflow portion 38 is connected to a pump constituting a battery temperature control device as a fluid supply device via an inflow portion side connection member such as a hose, a pipe, etc., and further, a battery temperature control device as a fluid storage portion via a pump It is connected to the tank which makes up (all are not shown).

  On the other hand, the inside of the outflow portion 40 is connected to the flow path 34 of the bottom portion 32 of the battery pack lower 30 via the front end of the outflow portion 40, and the flow path 34 Connected to the outside (rear side of the outflow portion 40). The outflow portion 40 is connected to the above-described tank via an outflow portion side connection member such as a hose, a pipe or the like. The above-described coolant is stored in the tank, and when the pump is operated, the coolant in the tank enters the inside of the flow path 34 from the inflow portion 38. The coolant that has entered the inside of the flow path 34 flows from the front side to the back side in the flow path 34. Thus, the coolant that has flowed to the rear side in the flow path 34 flows from the outflow portion 40 to the outside of the battery pack under 30 and returns to the tank. Thus, the coolant is circulated.

  Further, as shown in each of FIGS. 1 to 3, the battery pack 10 includes a protective member 42. The protective member 42 is in the form of a shallow tray, and the inner peripheral shape of the protective member 42 is set to be the same as the outer peripheral shape of the battery pack under 30 or larger than the outer peripheral shape of the battery pack under 30 ing. The protective member 42 is formed of a material such as metal such as duralmin or synthetic twill fiber having higher physical properties against load such as mechanical strength and rigidity than the battery pack under 30. The battery pack under 30 is covered by the protection member 42 from the lower side.

  The battery pack 10 having the above configuration is disposed, for example, on the lower side of the vehicle's floor panel (not shown) in a state where the vertical direction of the battery pack 10 is along the vertical direction of the vehicle.

<Operation and effect of the present embodiment>
In the present embodiment, when the pump of the battery temperature control device mounted in the vehicle is operated, the coolant flows from the tank of the battery temperature control device through the inflow portion 38 of the battery pack under 30 and flows through the battery pack under 30. It flows into the road 34. The coolant that has entered the flow path 34 flows from the front side to the back side in the flow path 34. Further, the coolant from the rear end of each of the flow channels 34 exits the battery pack under 30 from the outlet 40 of the battery pack under 30 and returns to the tank.

  As described above, when the coolant passes through the flow path 34 of the battery pack under 30, the heat of the battery pack under 30 is absorbed by the coolant, and the battery pack under 30 is cooled. In this state, if the temperature of the cell 22 in the battery pack body 12 is higher than the temperature of the battery pack under 30, the heat of the cell 22 is transmitted to the battery pack under 30 via the sheet member 28. As a result, the cells 22 can be cooled, and deterioration of the cells 22 due to heat can be suppressed.

  Here, the battery pack lower 16 constituting the battery pack body 12 is formed of iron or an alloy containing iron, but the hole 26 is formed in the bottom plate 24 of the battery pack lower 16 (battery pack body 12), The cells 22 in the battery pack body 12 are disposed in the sheet member 28 in the hole 26. The thermal conductivity of the sheet member 28 is higher than the thermal conductivity of iron, and more preferably higher than the thermal conductivity of the material forming the battery pack under 30.

  For this reason, for example, the heat of the cells 22 is efficiently transmitted to the battery pack lower 30 as compared with a configuration in which the hole 26 is not formed in the bottom plate 24 of the battery pack lower 16 (battery pack body 12). This allows the cells 22 to be cooled efficiently. As described above, in the present battery pack 10, the heat of the cells 22 can be efficiently transmitted to the battery pack under 30 to cool the cells 22 efficiently. Therefore, the battery pack under 30 is on the lower side of the battery pack lower 16 (battery pack body 12). The cell 22 can be cooled even with the configuration disposed in the above, and the configuration of the battery pack 10 can be simplified.

  On the other hand, the battery pack 10 is mounted on a vehicle. And the arrangement position of this battery pack 10 in vehicles is made into the vehicles lower side of the floor panel of vehicles. Here, in the present embodiment, the battery pack lower 16 of the battery pack body 12 is formed of iron or an alloy containing iron. For this reason, it is possible to suppress a reduction in mechanical strength, rigidity, and impact resistance against a load from the lower side of the vehicle, and, for example, a battery by foreign matter such as stone colliding with the battery pack main body 12 from the lower side of the vehicle Deformation or the like of the pack body 12 can be suppressed.

  Also, the battery pack under 30 through which the coolant flows inside is formed of an aluminum alloy. However, the battery pack under 30 is covered by the protection member 42 from the lower side. Here, the protective member 42 is formed of a material such as a metal such as duralmin or a synthetic twill fiber having higher physical characteristics with respect to loads such as mechanical strength and rigidity than the battery pack under 30. For this reason, it is possible to suppress a decrease in mechanical strength, rigidity, and impact resistance against a load from the lower side of the vehicle, and, for example, a battery by foreign matter such as stone colliding with the present battery pack 10 from the lower side of the vehicle The deformation and the like of the pack under 30 can be suppressed.

  Furthermore, the battery pack 10 is mounted on a vehicle. And the arrangement position of this battery pack 10 in vehicles is made into the vehicles lower side of the floor panel of vehicles. Here, in the present embodiment, the battery pack upper 14 which constitutes the battery pack body 12 together with the battery pack lower 16 is formed of a synthetic resin material. Therefore, even if the battery pack lower 16 is formed of iron or an alloy containing iron, the increase in weight of the battery pack body 12 can be suppressed.

  Further, as described above, by covering the battery pack under 30 from the lower side by the protective member 42, it is possible to suppress the deformation of the battery pack under 30 due to the impact from the lower side. Therefore, battery pack under 30 can be formed of an aluminum alloy, and an increase in weight of battery pack under 30 can be suppressed.

  As described above, since an increase in weight of the battery pack body 12 and the battery pack under 30 can be suppressed, the weight of the battery pack 10 can be reduced.

  In the present embodiment, the cell 22 is disposed on the sheet member 28. However, the cell 22 may be disposed on the battery pack lower 30 without providing the sheet member 28.

  Further, although the hole portion 26 is formed in the bottom plate 24 of the battery pack lower 16 in the present embodiment, the hole portion 26 may not be formed in the bottom plate 24.

  Furthermore, in the present embodiment, the battery pack under 30 is fixed to the bottom plate 24 of the battery pack lower 16. However, the battery pack under 30 may be fixed to the battery pack upper 14. That is, as long as the battery pack under 30 is fixed to the battery pack body 12, it is not limited to the specific aspect.

  Further, in the present embodiment, although the material of the coolant as the temperature control liquid is not particularly mentioned, the coolant may be pure water, or may be a so-called "antifreeze" such as ethylene glycol, or oil May be. That is, the cooling liquid is not limited to the specific mode as long as it can cool the cell 22 through the battery pack under 30 in a liquid state.

  Furthermore, in the present embodiment, the cell 22 is cooled by the cooling liquid as the temperature control liquid. However, for example, the cell 22 may be warmed by using the temperature control liquid as warm water. That is, the temperature control liquid may be configured to control the temperature of the cell 22.

  Further, in the present embodiment, the battery pack under 30 is fixed to the bottom plate 24 of the battery pack lower 16. However, the battery pack under 30 may be fixed to the battery pack upper 14. That is, as long as the battery pack under 30 is fixed to the battery pack body 12, it is not limited to the specific aspect.

DESCRIPTION OF SYMBOLS 10 battery pack 12 battery pack main body 14 battery pack upper 16 battery pack lower 22 cell 30 battery pack under

Claims (1)

A battery pack upper formed of a synthetic resin material,
A battery pack lower formed of iron or an alloy containing iron and provided below the battery pack upper and coupled to the battery pack upper to form a substantially box-shaped battery pack main body;
A cell disposed inside the battery pack body;
The lower part of the battery pack lower is disposed opposite to the bottom of the battery pack lower, and is connected to at least one of the battery pack upper and the battery pack lower, and is formed of an aluminum alloy and has a liquid temperature control inside With battery pack under which liquid flows,
Battery pack.