JP2023133995A - battery case - Google Patents

Abstract

To provide a battery case capable of ensuring the fixing of a high-voltage component to a device while ensuring insulation between the high-voltage component and a battery when the high-voltage component and the battery are housed in the same device.SOLUTION: A battery case accommodates a high-voltage component and a battery. The battery case includes an insulation pedestal, a metal plate material, a metal component fastening member, and a metal pedestal fastening member. The insulation pedestal supports the high-voltage component. The metal plate material is attached with the insulation pedestal. The component fastening member fixes the high-voltage component to the insulation pedestal. The pedestal fastening member fixes the insulation pedestal to the metal plate material. An end part on the insulation pedestal side of the component fastening member is positioned inside the insulation pedestal. Inside the insulation pedestal, the end part on the insulation pedestal side of the component fastening member and the pedestal fastening member are separated by a portion constituting the insulation pedestal.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to a battery case in which high voltage components and batteries are housed.

JP2013-055748A discloses a power storage device. This conventional power storage device includes a secondary battery, an inverter, and a chassis member. The inverter converts AC power from the outside into DC power and supplies the DC power to the secondary battery, or converts DC power from the secondary battery into AC power and outputs the AC power to the outside. The inverter is fixed to the chassis member, so that the inverter is supported by the power storage device. The chassis member is constructed from a metal material. Therefore, from the viewpoint of ensuring safety, a sheet-like insulating member is provided between the inverter and the chassis member.

Japanese Patent Application Publication No. 2013-055748

Japanese Unexamined Patent Publication No. 2013-055748 does not specifically disclose the fixing of the inverter to the chassis member. Therefore, it is assumed that the fixing to the chassis member is performed by pasting using adhesive tape. In this case, adhesive tape is used between the inverter and the insulating member, and also between the insulating member and the chassis member. In this case, there is a possibility that the inverter will separate from the chassis member due to deterioration of the adhesive tape.

Next, it is assumed that fixation to the chassis member is performed by fastening using bolts and nuts. In this case, it is possible to prevent the inverter from detaching from the chassis member. However, since it is difficult to provide an insulating member at the fastening site, it is difficult to ensure an insulating state. Therefore, when a high voltage component such as an inverter and a battery such as a secondary battery are housed in the same device, it is necessary to consider a specific configuration for reliably insulating the two.

One purpose of the present disclosure is to ensure that the high voltage components are fixed to the device and to ensure the insulation state between the high voltage components and the battery when the high voltage components and the battery are housed in the same device. The aim is to provide technology that can

A first aspect of the present disclosure is a battery case in which high voltage components and batteries are housed, and has the following characteristics.
The battery case includes an insulating pedestal, a metal plate, a metal component fastening member, and a metal pedestal fastening member. The insulating pedestal supports the high voltage component. The insulating pedestal is attached to the plate material. The component fastening member fixes the high voltage component to the insulating pedestal. The pedestal fastening member fixes the insulating pedestal to the plate material.
An end of the component fastening member on the insulating pedestal side is located inside the insulating pedestal.
Inside the insulating pedestal, an end of the component fastening member on the insulating pedestal side and the pedestal fastening member are separated by a portion that constitutes the insulating pedestal.

The second aspect of the present disclosure further has the following features in the first aspect.
The high voltage components include first and second high voltage components. The second high voltage component is stacked on the first high voltage component.
The component fastening member includes first and second component fastening members. The first component fastening member fixes the first high voltage component to the insulating pedestal. The second component fastening member fixes the second high voltage component to the insulating pedestal.
The first and second component fastening members are integrated into the insulating pedestal.
Inside the insulating pedestal in which the first and second component fastening members are integrated, the end of the first component fastening member on the insulating pedestal side and that of the second component fastening member constitute the insulating pedestal. separated by parts.

The third aspect of the present disclosure further has the following features in the first or second aspect.
The battery case further includes an additional plate made of metal. The battery is attached to the additional plate material.

According to the first aspect, the high voltage component is fixed to the insulating pedestal by the component fastening member, and the insulating pedestal is fixed to the plate material by the pedestal fastening member. Therefore, high voltage components can be fixed to the plate material via the insulating pedestal. In addition, the end of the component fastening member on the insulating pedestal side is located inside the insulating pedestal, and within this, the end of the component fastening member on the insulating pedestal side and the pedestal fastening member are connected to each other by the parts constituting the insulating pedestal. Separated. Therefore, it is also possible to interrupt electrical conduction between the plate material and high voltage components. Therefore, for example, when a battery is attached to a plate material, the battery and high voltage components can be insulated.

According to the second aspect, when the second high-voltage component is laminated on the first high-voltage component, the first and second component fastening members are assembled on a common insulating pedestal and these high-voltage components are stacked on the first high-voltage component. Can be fixed to an insulated pedestal. Furthermore, inside this common insulating pedestal, the end of the first component fastening member on the insulating pedestal side and that of the second component fastening member are separated by the portion constituting the insulating pedestal, so that the first component fastening member It becomes possible to simultaneously fix the first high voltage component to the insulating pedestal using the member and fix the second high voltage component to the insulating pedestal using the second component fastening member.

According to the third aspect, when a battery is attached to the additional metal plate, electrical conduction between the battery and the high voltage component can be interrupted.

FIG. 1 is a perspective view showing a configuration example of a battery case according to an embodiment. FIG. 2 is an exploded view illustrating a configuration example of the third stage of the battery case shown in FIG. 1. FIG. 2 is a diagram showing an example of the configuration around the insulating pedestal shown in FIG. 1. FIG. 2 is a diagram showing an example of the configuration around the insulating pedestal shown in FIG. 1. FIG.

Hereinafter, a battery case according to an embodiment will be described with reference to the drawings. In each figure, the same or corresponding parts are denoted by the same reference numerals, and the explanation thereof will be simplified or omitted.

1. Overall Configuration Example of Battery Case The battery case according to the embodiment is applied to, for example, a storage battery system of a general household or a small-scale facility such as a food and beverage store. The battery case according to the embodiment is installed adjacent to a facility and supplies power to various electrical appliances or receives power from an external power source. FIG. 1 is a perspective view showing a configuration example of a battery case according to an embodiment. In addition, the positive direction of the x-axis shown in FIG. 1 indicates, for example, the front of the battery case, the positive direction of the y-axis indicates, for example, the left side of the battery case, and the positive direction of the z-axis indicates, for example, the upper side of the battery case. Examples of the positional relationships between the positive directions of the x-axis, y-axis, and z-axis and the battery case are the same in other figures.

In the example shown in FIG. 1 , the battery case includes a battery cover 11 . The battery cover 11 is formed into a box shape. The bottom portion of the battery cover 11 is open, and the outer edge of this bottom portion extends around the battery cover 11 like an eaves. This outer edge is mechanically joined (fixed with bolts) to the bottom plate material 12. The bottom plate material 12 is made of, for example, a general-purpose flat bar (flat steel). The bottom portion of the battery cover 11 is covered by this bottom plate material 12.

In the example shown in FIG. 1, for convenience of explanation, the internal structure of the battery case is depicted with the battery cover 11 transparent. The inside of the battery case is composed of three stages, the first stage (lower stage) and the second stage (middle stage) are partitioned by a plate 21, and the second stage (middle stage) and the third stage (upper stage) are partitioned by a plate material 31. ing. The plates 21 and 31 are made of, for example, general-purpose flat bars. The plate material 21 is supported by supporting members 22a to 22e. The plate material 31 is supported by supporting members 32a to 32d. The plate material 31 corresponds to a "plate material" in the present disclosure, and the plate material 21 corresponds to an "additional plate material" in the present disclosure.

The second stage accommodates a battery stack FC in which a plurality of cells are stacked. A battery stack having the same configuration as battery stack FC is also accommodated in the first stage. However, this battery stack is hidden behind the L-shaped plate 51 shown in FIG. The third stage houses electronic components for controlling charging and discharging by these battery stacks. These battery stacks correspond to the "batteries" of this disclosure. Examples of electronic components accommodated in the third stage include a battery ECU (Electric Control Unit) and a voltage sensor. A configuration example of the third stage including a battery ECU and a voltage sensor will be described later.

In the example shown in FIG. 1, the battery case has a plurality of support members 41 (support members 41a to 41j). These strut members 41 are provided around the battery stack FC, and each strut member 41 extends in the z-axis direction (ie, in the vertical direction). Each strut member 41 is made of, for example, a general-purpose aluminum extrusion material. Each tip of the support column member 41 faces the inner surface of the battery cover 11. On the other hand, each base end of the support column member 41 faces the upper surface of the bottom plate material 12. Support members 41a, 41c, 41e, 41g, and 41i are lined up on the left side of battery stack FC. On the other hand, support members 41b, 41d, 41f, 41h, and 41j are lined up on the right side of battery stack FC.

The strut members 41a and 41b form a pair on the left and right sides of the battery stack FC. Similarly, the strut members 41c and 41d form a pair, the strut members 41e and 41f form a pair, the strut members 41g and 41h form a pair, and the strut members 41i and 41j form a pair. Note that the total number of strut members 41 is not limited to the number (10) shown in FIG. 1. The total number of strut members 41 can be changed arbitrarily as long as at least the strut members 41 (that is, strut members 41a, 41b, 41i, and 41j) corresponding to the four corners of the battery stack FC are included.

2. Configuration example of third stage FIG. 2 is an exploded view illustrating a configuration example of the third stage of the battery case shown in FIG. 1. In the example shown in FIG. 2, component cases 34 and 36 and a junction block 37 are provided on the plate 31 at the third stage. The component case 34 is composed of a resin casing, and a battery ECU is housed therein. The battery ECU is an electronic component for controlling charging and discharging by the battery stack. Although not shown in FIG. 2, a component case (component case 35) having the same configuration as the component case 34 is stacked above the component case 34, and a voltage sensor is accommodated here. The voltage sensor detects, for example, the voltage of each cell making up the battery stack. Voltage sensors are also included in the electronic components for controlling charging and discharging by the battery stack. The component cases 34 and 35 correspond to "high voltage components" of the present disclosure.

The component case 34 has support fittings (brackets) 34a and 34b on both sides in the x-axis direction (that is, the front-rear direction of the battery case or the longitudinal direction of the battery stack FC). Two holes are formed in the support metal fitting 34a, and one hole is formed in the support metal fitting 34b. Two bolts BL provided on the insulating pedestal 33a are inserted into the two holes of the support fitting 34a, respectively. One bolt BL provided on the insulating pedestal 33b is inserted into one hole of the support fitting 34b. These bolts BL are combined with flange nuts (flanged nuts) FN, thereby fixing the component case 34 to the insulating pedestals 33a and 33b. The three bolts BL provided on the insulating pedestals 33a and 33b and the three flange nuts FN respectively combined with these bolts BL correspond to "component fastening members" of the present disclosure.

The insulating pedestals 33a and 33b are made of resin, for example, and are fixed to the component case 34 and also to the plate material 31. The insulating pedestals 33a and 33b are fixed to the plate material 31 using four bolts BL provided on the plate material 31 and nuts NT respectively combined with these bolts BL. The four bolts BL provided on the plate material 31 and the nuts NT combined with these bolts BL correspond to the "pedestal fastening member" of the present disclosure.

The component case 36 is composed of a metal casing, and an interface ECU is accommodated here. The interface ECU is an electronic component for controlling communication between the battery ECU and various electronic components (eg, voltage converter) electrically connected to the outside of the battery case. The component case 36 is fixed to the plate material 31. The component case 36 is fixed to the plate 31 by a combination of bolts BL and nuts NT, similar to the fixing of the insulating pedestals 33a and 33b to the plate 31.

The junction block 37 collects the wiring drawn from the outside of the battery case into the inside of the battery case, and these wirings are connected to various electronic components inside the battery case via the junction block 37. . Junction block 37 is fixed to plate material 31. The junction block 37 is fixed to the plate 31 by a combination of bolts BL and nuts NT, similar to the fixing of the insulating pedestals 33a and 33b to the plate 31.

3. Example of configuration around the insulating pedestal FIG. 3 is a view of the battery case cut along the line III--III shown in FIG. 1, viewed from the left side of the battery case. FIG. 4 is a diagram of the battery case cut along line VI-VI shown in FIG. 1, viewed from the front of the battery case. In addition, for convenience of explanation, the lower part from the middle of the second stage is omitted in FIGS. 3 and 4.

As shown in FIG. 3, a component case 35 is stacked on top of the component case 34. As shown in FIG. The component cases 34 and 35 are supported by an insulating pedestal (i.e., insulating pedestal 33a) close to the junction block 37 and an insulating pedestal (i.e., insulating pedestal 33b) close to the component case 36. In this way, both ends of the component cases 34 and 35 in the x-axis direction are supported by the insulating pedestals 33a and 33b, respectively. A space SP exists between the central part of the component case 34 and the plate material 31 in the x-axis direction. The existence of this space SP suppresses heat from the battery ECU from being transmitted to the battery stack FC via the plate material 31. At the same time, heat from the battery stack FC is also suppressed from being transmitted to the battery ECU via the plate material 31.

The insulating pedestal 33a is provided with one bolt BL inserted into one hole of the support metal fitting 35a in addition to two bolts BL inserted into the two holes of the support metal fitting 34a. The support fitting 35a is provided at one end of the component case 35 near the junction block 37, and one bolt BL is also inserted into one hole formed here. The bolt BL inserted into the hole of the support fitting 35a is provided closer to the junction block 37 than the bolts BL inserted into the two holes of the support fitting 34a.

The bolt BL inserted into one hole of the support fitting 35a is longer than the bolts BL inserted into each of the two holes of the support fitting 34a. This is because the distance from the insulating pedestal 33a to the support fitting 35a is longer than that from the insulating pedestal 33a to the supporting fitting 34a. The bolt BL inserted into one hole of the support fitting 35a and the bolt BL inserted into two holes of the support fitting 34a are separated by a portion (pedestal portion) 331 that constitutes the insulating pedestal 33a. As a result, the bolts BL inserted into the respective holes of the support fittings 34a and 35a are supported by the insulating pedestal 33a.

The insulating pedestal 33b is provided with two bolts BL that are respectively inserted into two holes of the support fitting 35b. These bolts BL are different from the bolts BL inserted into one hole of the support fitting 34b described in FIG. 2. The bolts BL inserted into the two holes of the support fitting 35b are longer than the bolt BL inserted into one hole of the support fitting 34b explained in FIG. 2. The reason for this is the same as the reason stated in the explanation of the support fitting 35a. Note that the bolts BL inserted into the two holes of the support fitting 35b are also illustrated in FIG. 2. Further, like the insulating pedestal 33a, in the insulating pedestal 33b as well, electrical conduction between the bolts BL inserted into the respective holes of the support fittings 34b and 35b is interrupted by the parts that constitute the insulating pedestal 33b.

The cross section depicted in FIG. 4 corresponds to the cross section when the battery case is cut at a position passing approximately through the center of the insulating pedestal 33a. As shown in FIG. 4, the bolts BL inserted into the two holes of the support fitting 34a are combined with two flange nuts FN, respectively. These flange nuts FN are located on the support fitting 34a. In other words, these flange nuts FN are located on the component case 34 side. On the other hand, each head of the bolt BL combined with these flange nuts FN is located inside the insulating pedestal 33a. Each head of the bolt BL is located on the side closer to the component case 34. Note that each head of the bolt BL corresponds to an "end portion on the insulating pedestal side" of the present disclosure.

Since the flange nut FN is located on the component case 34 side, if a leakage occurs in the battery ECU, the component case 34 will be charged. Then, the support metal fitting 34a in contact with the component case 34 and the bolt BL inserted into the two holes of this support metal fitting 34a are also charged. However, since each head of these bolts BL is located inside the insulating pedestal 33a, electrical conduction between each head of the bolt BL and the plate material 31 is interrupted. Therefore, even if a leakage occurs in the battery ECU, the charging range can be suppressed from reaching the plate material 31.

Although not shown in FIG. 4, the head of the bolt BL inserted into one hole of the support metal fitting 35a is the same as the head of the bolt BL inserted into two holes of the support metal fitting 34a. Located inside. Further, the flange nut FN combined with the bolt BL inserted into one hole of the support fitting 35a is located on the component case 35 side. Therefore, electrical conduction between the head of the bolt BL inserted into one hole of the support fitting 35a and the plate material 31 is interrupted, and even if a leakage occurs in the voltage sensor, the charging range is limited to the plate material 31. The spread can be suppressed.

Furthermore, the arrangement of the flange nuts FN in the support fittings 34b and 35b is the same as that of the flange nuts FN in the support fitting 34a. The arrangement of the heads of the bolts BL on the insulating pedestal 33b is the same as that of the heads of the bolts BL on the insulating pedestal 33a.

Further, as shown in FIG. 4, two holes are formed in the insulating pedestal 33a passing through in the z-axis direction, and two bolts BL are inserted into each hole. The bolts BL inserted into the two through holes of the insulating pedestal 33a are respectively combined with two nuts NT. These nuts NT are located on the upper surface of the insulating pedestal 33a. Note that the bolts BL combined with these nuts NT are inserted into two through holes of the insulating pedestal 33a from the lower surface side of the plate material 31, respectively. Therefore, each head of the bolt BL is located on the lower surface side of the plate material 31. Further, in the example shown in FIG. 4, cylindrical collars CL are provided in the two through holes of the insulating pedestal 33a, respectively. The bolts BL inserted into the two through holes of the insulating pedestal 33a are inserted along the central axes of these collars CL.

Further, as shown in FIG. 4, the bolt BL inserted into the left through hole of the insulating pedestal 33a and the head of the bolt BL inserted into the left hole of the support fitting 34a are connected to the insulating pedestal 33a. They are separated by a constituent part (pedestal part) 332. In addition, the bolt BL inserted into the right through hole of the insulating pedestal 33a and the head of the bolt BL inserted into the right hole of the support fitting 34a are parts that constitute the insulating pedestal 33a (pedestal part) 333. In this way, in the insulating pedestal 33a, electrical conduction is interrupted between the bolts BL inserted into each hole of the support fitting 34a and the bolts BL inserted into each through hole of the insulating pedestal 33a.

The arrangement of the bolt BL, nut NT, and collar CL in the insulating pedestal 33b is the same as that in the insulating pedestal 33a.

4. Effects According to the battery case according to the embodiment described above, the component cases 34 and 35 are attached to the insulating pedestals 33a and 33b by the combination of the flange nut FN and the bolt BL inserted into each hole of the support fittings 34a and 34b. Fixed. Further, the insulating pedestals 33a and 33b are fixed to the plate material 31 by a combination of a nut NT and a bolt BL inserted into each through hole of these insulating pedestals. Therefore, the component cases 34 and 35 can be fixed to the plate material 31 via the insulating pedestals 33a and 33b.

Moreover, according to the battery case according to the embodiment, the head of the bolt BL combined with the flange nut FN is located inside the insulating pedestals 33a and 33b. Further, inside this, the head of the bolt BL and the bolt BL inserted into each through hole of the insulating pedestal 33a (or insulating pedestal 33b) are separated by a portion that constitutes the insulating pedestal 33a (or insulating pedestal 33b). . Therefore, electrical conduction between the plate material 31 and the component cases 34 and 35 can also be interrupted. Therefore, the battery stack and the component cases 34 and 35 can be insulated.

Moreover, according to the battery case according to the embodiment, the bolt BL inserted into one hole of the support metal fitting 35a (or the bolt BL inserted into two holes of the support metal fitting 35b) and the two holes of the support metal fitting 34a. The bolts BL inserted into the two holes (or the bolts BL inserted into the two holes of the support fitting 35b) are separated from each other by a portion constituting the insulating pedestal 33a (or the insulating pedestal 33b). Therefore, the bolts BL inserted into the respective holes of the support fittings 34a and 35a (or the support fittings 34b and 35b) can be supported by the insulating pedestal 33a (or the insulating pedestal 33b) common to these supporting fittings. Therefore, it is possible to simultaneously fix the component cases 34 and 35 to the insulating pedestal 33a (or insulating pedestal 33b).

11 Battery cover 12 Bottom plate material 21, 31 Plate material 22a to 22d, 32a to 32d Support material 33a, 33b Insulating pedestal 331, 332, 333 Pedestal part 34, 35, 36 Parts case 34a, 34b, 35a, 35b Support metal fittings 37 Junction block 41a-41j Support members 51 L-shaped plate material BL Bolt CL Color FC Battery stack FN Flange nut NT Nut SP Space

Claims (3)

A battery case in which high voltage components and batteries are housed,
an insulating pedestal that supports the high voltage component;
a metal plate to which the insulating pedestal is attached;
a metal component fastening member that fixes the high voltage component to the insulating pedestal;
a metal pedestal fastening member that fixes the insulating pedestal to the plate material;
Equipped with
An end of the component fastening member on the insulating pedestal side is located inside the insulating pedestal,
A battery case characterized in that, inside the insulating pedestal, an end of the component fastening member on the insulating pedestal side and the pedestal fastening member are separated by a portion constituting the insulating pedestal. The high voltage component includes a first high voltage component and a second high voltage component laminated on the first high voltage component,
The component fastening member includes a first component fastening member that fixes the first high voltage component to the insulating pedestal, and a second component fastening member that fixes the second high voltage component to the insulating pedestal,
the first and second component fastening members are aggregated on the insulating pedestal,
Inside the insulating pedestal in which the first and second component fastening members are integrated, an end of the first component fastening member on the insulating pedestal side and that of the second component fastening member constitute the insulating pedestal. The battery case according to claim 1, wherein the battery case is separated by a portion. The battery case according to claim 1 or 2, further comprising an additional plate made of metal that is arranged parallel to the plate and to which the battery is attached.

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