JP2021026940A - Battery pack - Google Patents

Abstract

To prevent a liquid and a foreign matter from immersing into an inner part from between a battery case and an electric component case.SOLUTION: A battery pack comprises: a cylindrical type battery case 2 for housing a cell 10; an electric component case 3 for housing an electric component 34; a plate-like member 4 for sealing an open part 20a of a battery case 2 between the battery case 2 and the electric component case 3. The battery case 2 includes a first liquid flow channel 231, and the electric component case 3 includes a second liquid flow channel 331. The battery case 2 and the plate-like member 4 are bonded with a first bonding part WL1 along a whole periphery of an outer peripheral edge 4a of the plate-like member 4, and the battery case 2 and the electric component case 3 are bonded with a second bonding part WL2 along the whole periphery of the outer peripheral edge 2b of an end surface 2a. Flow channel ports 231a and 331a of the first liquid flow channel 231 and the second liquid flow channel 331 are communicated in the outer side of the first bonding part WL1 and the inner side of the second bonding part WL2.SELECTED DRAWING: Figure 7

Description

The present invention relates to a battery pack.

In electric vehicles and hybrid vehicles, a plurality of battery cells (hereinafter, simply referred to as "cells" in the present specification) composed of a secondary battery such as a lithium ion battery are housed in a battery case as a power source for a drive motor. The battery pack is installed.

Conventionally, as such a battery pack, a battery pack in which a plurality of cells and a management device which is an electric component electrically connected to the cells are adjacently accommodated is known (see, for example, Patent Document 1). In this battery pack, the internal space is divided into a storage space for the battery stack and a storage space for the management device, and the space between the two storage spaces is sealed by an air spacer, so that the air for cooling the battery stack is sent to the management device side. It suppresses intrusion and keeps the area where the management equipment is housed clean.

Japanese Unexamined Patent Publication No. 2012-84363

In order to efficiently cool the cells contained in the battery pack, it is desirable to use a liquid rather than air as the cooling medium. When a liquid is used as the cooling medium, the coolant is circulated in the battery pack to efficiently cool the cells, but the cells in the battery pack and the electrical components become foreign substances such as coolant, dust, and dust. It is necessary to prevent the ingress of coolant and foreign matter from between the cell housing and the electrical component housing in the battery pack to a higher degree than in the case of air so as not to come into direct contact with each other.

An object of the present invention is to provide a battery pack capable of preventing liquid or foreign matter from entering the inside of the battery case and the electric component case from between the battery case and the electric component case.

(1) The battery pack according to the present invention (for example, the battery pack 1 described later) passes through an opening (for example, the opening 20a described later) arranged on an end face (for example, the end face 2a described later) and a cell (for example, described later). A tubular battery case (for example, a battery case 2 described later) for accommodating the cell 10) and an electric component (for example, an electric component 34 described later) arranged so as to cover the end face of the battery case. A plate-shaped member (for example, described later) arranged between the electric component case (for example, the electric component case 3 described later) and the battery case and the electric component case so as to close the opening of the battery case. The battery case includes a plate-shaped member 4), and the battery case has a first liquid flow path (for example, a first liquid flow path 231 described later) in which a flow path port (for example, a flow path port 231a described later) opens at the end surface. The electric component case has a second liquid flow path (for example, a second liquid flow path 331 described later) in which a flow path port (for example, a flow path port 331a described later) opens toward the end surface of the battery case. The battery case and the plate-shaped member have a first joint portion (for example, the first joint portion WL1 described later) along the entire circumference of the outer peripheral edge (for example, the outer peripheral edge 4a described later) of the plate-shaped member. The battery case and the electric component case are joined by a second joint portion (for example, a second joint described later) along the entire circumference of the outer peripheral edge (for example, the outer peripheral edge 2b described later) of the end face of the battery case. A battery pack that is joined by a portion WL2), and the flow paths of the first liquid flow path and the flow path ports of the second liquid flow path communicate with each other outside the first joint portion and inside the second joint portion. ..

According to (1) above, the second joint prevents liquids and foreign substances from entering between the battery case and the electrical component case from the outside of the battery case, and the battery case is inside the second joint. Since the first joint is formed along the outer peripheral edge of the plate-shaped member that serves as a sealing portion for preventing the intrusion into the inside of the liquid flow path, the flow paths of the first liquid flow path and the second liquid flow path are temporarily communicated with each other. Even if water leaks from the portion, it is prevented from entering the inside of the first joint and the inside of the plate-shaped member. Therefore, it is possible to prevent liquids and foreign substances from entering the inside of the battery case and the electric component case from between the battery case and the electric component case.

(2) In the battery pack according to (1), the electrical component case has an end wall portion (for example, an end wall portion 32 described later) arranged parallel to the end surface of the battery case and the end wall portion. The plate-shaped member is provided with a first insertion hole (for example, a first insertion hole 321 described later) through which a connection component electrically connected to the electric component can be inserted. It has a second insertion hole (for example, a second insertion hole 41 described later) for communicating the inside of the battery case and the inside of the electric component case corresponding to the insertion hole, and the first insertion hole and the second insertion hole. The insertion hole is sealed by a sealing member (for example, sealing members 200, 201) with respect to the outside of the first insertion hole and the second insertion hole between the electric component case and the plate-shaped member. May be good.

According to the above (2), since the first insertion hole and the second insertion hole are sealed to the outside thereof, it is possible to prevent liquid or foreign matter from entering from the outside of the first insertion hole and the second insertion hole. ..

(3) In the battery pack according to (1) or (2), the battery case, the electric component case, and the plate-shaped member are made of metal, and the first joint and the second joint are made of metal. It may be a joint formed by welding or friction stir welding.

According to the above (3), since the strong first joint portion and the second joint portion can be formed, the effect of preventing the intrusion of liquid or foreign matter in each joint portion can be enhanced.

(4) In the battery pack according to any one of (1) to (3), the cell has a terminal surface (for example, a terminal described later) on which positive and negative electrode terminals (for example, an electrode terminal 11 described later) are arranged together. The first liquid flow path and the second liquid flow path, respectively, when the surface 10a) is provided and the direction in which the terminal surface of the cell in the cell accommodating portion faces is above the battery case. The upper end of the flow path port (for example, the upper end E1 described later) may be arranged below the terminal surface of the cell.

According to the above (4), even if the liquid leaking from the communication portion between the flow path ports of the first liquid flow path and the second liquid flow path may infiltrate into the cell accommodating portion from the first joint portion, the cell It is possible to prevent water from being applied to the electrode terminals.

(5) In the battery pack according to any one of (1) to (4), the upper end of the flow path port of each of the first liquid flow path and the second liquid flow path is the plate-shaped member. It may be arranged below the lower end of the second insertion hole (for example, the lower end E2 described later).

According to the above (5), the liquid leaking from the communication portion between the flow path ports of the first liquid flow path and the second liquid flow path is allowed to pass through the first insertion hole and the second insertion hole from between the plate-shaped member and the electric component case. It becomes difficult to penetrate into the holes, and the effect of preventing liquids and foreign substances from entering the inside of the battery case and the inside of the electric component case can be further enhanced.

According to the present invention, it is possible to provide a battery pack capable of preventing liquid or foreign matter from entering the inside of the battery case and the electric component case from between the battery case and the electric component case.

It is a perspective view of a battery pack. It is a perspective view which shows the main part of a battery pack by disassembling. It is a perspective view which shows the state of joining a battery case and a plate-shaped member. It is a figure which shows the end face of the battery case after the plate-shaped member is joined. It is sectional drawing which follows the AA line in FIG. It is a perspective view which shows the state of joining a battery case and an electric component accommodating part. It is a figure which shows the end face of the battery case after the electric component case is joined. It is sectional drawing which follows the line BB in FIG. It is sectional drawing which follows the CC line in FIG. It is a figure which shows a part of the joint surface of a battery case and an electric component case. It is sectional drawing which cut at the same part | part as the line BB in FIG. 7 of the battery pack which used the seal member which concerns on another embodiment. It is a figure which shows the arrangement relationship between a cell and a 1st liquid flow path.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The battery pack 1 of the present embodiment includes two battery cases 2 and 2, one electric component case 3 arranged so as to be sandwiched between the battery cases 2 and 2, and each battery case 2 and 2 and an electric component. It has two plate-shaped members 4 and 4 respectively arranged between the case 3 and a plurality of cells 10 housed in the battery cases 2 and 2. In the direction shown in each figure, the X direction indicates the length direction of the battery pack 1. The X direction is also the stacking direction of the plurality of cells 10. The Y direction indicates the width direction of the battery pack 1. The Z direction indicates the height direction of the battery pack 1.

The two battery cases 2 and 2 have the same configuration. The battery case 2 has an upper wall portion 21, a bottom wall portion 22, and two side wall portions 23, 23, and is made of a metal such as aluminum or an aluminum alloy, and is long by extrusion molding with the X direction as the extrusion direction. It is formed in a long tubular shape. Horizontally long rectangular openings 20a are arranged on both end faces 2a and 2a of the battery case 2 along the X direction of the battery case 2. The inside of the battery case 2 is a cell accommodating portion 20, and a cell group 100 formed by stacking a plurality of cells 10 along the X direction is accommodated through the opening 20a. The cell accommodating portion 20 of the battery case 2 of the present embodiment is configured to accommodate two cell groups 100 and 100 side by side in the width direction of the battery case 2. In FIG. 2, the cell 10 in the battery case 2 is not shown.

A temperature control medium (cooling water or warming water) for controlling the temperature of each cell 10 in the battery case 2 can be circulated through the side wall portions 23, 23 of the battery case 2. It has first liquid flow paths 231 and 231 respectively. The first liquid flow path 231 is formed so as to penetrate the battery case 2 in the length direction in the wall of the side wall portion 23. Therefore, the flow path ports 231a and 231a of the first liquid flow paths 231 and 231 are opened in the end surface 2a of the battery case 2.

Of the two openings 20a and 20a of the battery case 2, the opening 20a on the side facing the electric component case 3 is covered by the electric component case 3 over the entire end surface 2a of the battery case 2. .. Further, the opening 20a on the side opposite to the electric component case 3 is covered with a lid 24 that covers the entire end surface 2a of the battery case 2. The lid body 24 is fixed to the end face 2a of the battery case 2 by bolts or the like (not shown) after the cell groups 100, 100 are housed in the cell housing portion 20. In FIG. 2, the lid 24 is not shown.

The electric component case 3 is a rectangular box-shaped container that is made of the same metal as the battery case 2 and is made of a metal such as aluminum or an aluminum alloy and has an opening at the top. Specifically, the electric component case 3 has a rectangular bottom wall portion 31, end wall portions 32, 32 erected from the bottom wall portion 31, and side wall portions 33, 33. The end wall portions 32, 32 have a horizontally long rectangular shape having the same shape as the end faces 2a, 2a of the battery cases 2, 2, and face the end faces 2a, 2a and are parallel to the end faces 2a, 2a. Have been placed. The side wall portions 33, 33 are arranged parallel to the side wall portions 23, 23 so that the end wall portions 32, 32 are connected to each other and are substantially flush with the side wall portions 23, 23 of the battery cases 2, 2. ing. The electric component case 3 is joined to the end faces 2a and 2a of the battery cases 2 and 2 at the end wall portions 32 and 32, respectively.

The end wall portions 32, 32 and the side wall portions 33, 33 surround the four circumferences of the bottom wall portion 31 and form a side peripheral wall of the electric component case 3. The internal space surrounded by the wall portions 31, 32, and 33 constitutes an electric component accommodating portion 30 in which an electric component 34 such as a power distribution component is accommodated. The electric component accommodating portion 30 is covered with a lid 35 that covers the upper surface of the electric component case 3. The lid 35 is fixed to the upper surface of the electric component case 3 with bolts or the like (not shown). A terminal portion 341 for electrical connection with the electric component 34 is provided on one side wall portion 33 of the electric component case 3. In FIG. 2, the electric component 34 and the lid 35 are not shown.

As shown in FIG. 2, second liquid flow paths 331 and 331 are provided inside the side wall portions 33 and 33 of the electric component case 3, respectively. The second liquid flow path 331 supplies a temperature control medium from the electric component case 3 side to the first liquid flow path 231 in the battery case 2, or from the first liquid flow path 231 to the electric component case 3 side. It is a flow path for returning the temperature control medium. The second liquid flow path 331 passes through the wall of the side wall portion 33 and opens to the end wall portions 32 and 32. Therefore, the flow path ports 331a and 331a of the second liquid flow paths 331 and 331 are opened on the surfaces of the end wall portions 32 and 32 corresponding to the connection portions with the side wall portions 33 and 33 of the electric component case 3. Each side wall portion 33, 33 of the electric component case 3 is provided with an inflow / outflow terminal portion 332 of a temperature control medium communicating with each other in the second liquid flow paths 331 and 331.

Each end wall portion 32, 32 of the electric component case 3 has first insertion holes 321 and 321 for communicating the cell accommodating portion 20 of the battery case 2 and the electric component accommodating portion 30, respectively. The first insertion hole 321 penetrates the end wall portion 32 at a position above the electrical component 34 housed in the electrical component accommodating portion 30. Therefore, the first insertion hole 321 can insert a connecting component (not shown) such as a harness that electrically connects the electrical component 34 in the electrical component accommodating portion 30 and the cell groups 100 and 100 in the cell accommodating portion 20. Is. The first insertion holes 321 of the present embodiment are provided so as to correspond to one cell group 100 by two, but the number of the first insertion holes 321 provided in one end wall portion 32 is one. It may be one or more.

The plate-shaped member 4 is a closing member that closes the opening 20a of the battery case 2, and is made of the same metal as the battery case 2 such as aluminum or an aluminum alloy to form an opening 20a facing the electric component case 3 in the battery case 2. It is formed in the shape of a rectangular thin plate of the same shape. The plate-shaped member 4 is joined to the opening 20a of the battery case 2 at its outer peripheral edge 4a.

The plate-shaped member 4 has second insertion holes 41 and 41. The second insertion hole 41 has substantially the same shape as the first insertion hole 321 of the electric component case 3, and is arranged at a position corresponding to the first insertion hole 321 so as to communicate with the first insertion hole 321. .. As a result, the cell accommodating portion 20 of the battery case 2 and the electric component accommodating portion 30 of the electric component case 3 communicate with each other through the first insertion hole 321 and the second insertion hole 41.

Next, a method of joining the battery case 2, the electric component case 3, and the plate-shaped member 4 to each other will be described.
Before joining the battery case 2 and the electric component case 3, the battery case 2 and the plate-shaped member 4 are joined as shown in FIGS. 3, 4 and 5. The plate-shaped member 4 is arranged so as to fit inside the opening 20a of the battery case 2 in which the cell 10 is not yet housed, and is joined along the entire circumference of the outer peripheral edge 4a of the plate-shaped member 4. As a result, the first joint portion WL1 along the entire circumference of the outer peripheral edge 4a of the plate-shaped member 4 is formed. The outer peripheral edge 4a of the plate-shaped member 4 is also the inner peripheral edge of the opening 20a of the battery case 2. Therefore, it can be said that the first joint portion WL1 is formed along the entire circumference of the inner peripheral edge of the opening 20a of the battery case 2.

The plate-shaped member 4 after joining may close the opening 20a flush with respect to the end surface 2a of the battery case 2, or the cell so as to form a step with respect to the end surface 2a of the battery case 2. The opening 20a may be closed so as to slightly enter the accommodating portion 20.

Next, as shown in FIGS. 6 and 7, the battery case 2 and the electric component case 3 are the end surface 2a of the battery case 2 on the side where the plate-shaped member 4 is joined and the end wall portion of the electric component case 3. It is arranged so as to be in contact with the 32, and is joined along the entire circumference of the outer peripheral edge 2b of the end surface 2a of the battery case 2. As a result, the second joint portion WL2 is formed along the entire circumference of the outer peripheral edge 2b of the end surface 2a of the battery case 2. The outer peripheral edge 2b of the end surface 2a of the battery case 2 is also the outer peripheral edge 32a of the end wall portion 32 of the electric component case 3. Therefore, it can be said that the second joint portion WL2 is formed along the entire circumference of the outer peripheral edge 32a of the end wall portion 32 of the electric component case 3.

By joining the battery case 2 and the electric component case 3 by the first joint portion WL1 and the second joint portion WL2, the first insertion hole 321 and the second insertion hole 41 communicate with each other and the first liquid flow flows. The flow path port 231a of the road 231 and the flow path port 331a of the second liquid flow path 331 communicate with each other. As shown in FIGS. 7 and 10, the communication portions between the flow path ports 231a and 331a are arranged outside the first joint portion WL1 and inside the second joint portion WL2.

After the two battery cases 2 and 2 are joined to the end wall portions 32 and 32 of the electric component case 3, the cell groups 100 and 100 are placed in the cell accommodating portions 20 and 20 of the battery cases 2 and 2, respectively. Be housed. After accommodating the cell groups 100 and 100, the openings 20a and 20a of the battery cases 2 and 2 are covered with the lids 24 and 24, and the electric component 34 is accommodated in the electric component accommodating portion 30. By covering the upper part of No. 3 with the lid 35, the battery pack 1 shown in FIG. 1 is obtained.

Since the battery case 2, the electric component case 3, and the plate-shaped member 4 of the present embodiment are formed of the same type of metal, the first joint portion WL1 and the second joint portion WL2 may be formed by welding or friction stir welding. it can. As a result, a strong first joint portion WL1 and a second joint portion WL2 can be formed, and the effect of preventing the ingress of liquids and foreign substances in the first joint portion WL1 and the second joint portion WL2 can be enhanced.

As described above, by joining the battery case 2, the electric component case 3, and the plate-shaped member 4 to each other, as shown in FIG. 10, between the battery case 2 and the electrical component case 3 from the outside of the battery pack 1. The intrusion path R1 of the liquid or foreign matter into the second joint portion WL2 is blocked by the second joint portion WL2 arranged on the outermost side, and the intrusion into the inside of the second joint portion WL2 is prevented.

Further, since the first joint portion WL1 along the outer peripheral edge 4a of the plate-shaped member 4 serving as a sealing portion for preventing the battery case 2 from entering the cell accommodating portion 20 is arranged inside the second joint portion WL2. Even if water leaks from the communication sites between the flow path ports 231a and 331a, the intrusion path R2 into the cell accommodating portion 20 is blocked by the first joint portion WL1 and the plate-shaped member 4, and the inside of the cell accommodating portion 20. There is no risk that the cell 10 will be flooded. Therefore, the ingress of liquid or foreign matter into the cell accommodating portion 20 of the battery case 2 and the electric component accommodating portion 30 surrounded by the electric component case 3 is highly prevented.

Before joining the battery case 2 and the electric component case 3, a sealing member 200 may be provided in advance so as to surround the first insertion hole 321 or the second insertion hole 41. FIG. 7 shows a case where the seal member 200 is provided on the surface 4b of the plate-shaped member 4 facing the electric component case 3. However, the seal member 200 may be provided on the surface 32b of the end wall portion 32 of the electric component case 3 facing the battery case 2.

The sealing member 200 is composed of, for example, a liquid gasket made of a liquid sealing material, a solid gasket made of rubber or the like, packing, or the like, and is provided so as to surround the outer peripheral sides of the second insertion holes 41 and 41, respectively. Therefore, when the battery case 2 and the electric component case 3 are joined by the second joint portion WL2, as shown in FIG. 8, the seal member 200 is attached to each other between the electric component case 3 and the plate-shaped member 4. The first insertion hole 321 and the second insertion hole 41 that communicate with each other are sealed with respect to the outside of the first insertion hole 321 and the second insertion hole 41. Therefore, even if a liquid or a foreign substance may pass through the second joint portion WL2 from the outside of the battery pack 1 and invade to the periphery of the first insertion hole 321 and the second insertion hole 41, the seal member 200 Invasion into the first insertion hole 321 and the second insertion hole 41 is prevented. Therefore, the effect of preventing the ingress of liquids and foreign substances into the cell accommodating portion 20 and the electric component accommodating portion 30 is further enhanced.

The first insertion hole 321 and the second insertion hole 41 are sealed by, for example, as shown in FIG. 11, a tubular sealing member 201 fitted and attached to the first insertion hole 321 and the second insertion hole 41. May be good. The tubular sealing member 201 is formed of a soft material such as rubber or resin or an elastic material, penetrates the first insertion hole 321 and the second insertion hole 41, and fits in close contact with the inner peripheral surface thereof. It has a tubular portion 201a to be formed. Therefore, similarly to the above, the sealing member 201 prevents the ingress of liquid or foreign matter into the first insertion hole 321 and the second insertion hole 41.

Although not shown, the sealing members 200 and 201 can be similarly applied to the communication portions between the flow path ports 231a and 331a of the first liquid flow path 231 and the second liquid flow path 331.

As shown in FIG. 12, each cell 10 in the cell accommodating portion 20 is aligned with the terminal surface 10a on which the pair of positive and negative electrode terminals 11 and 11 are arranged facing upward, and the bottom wall portion 22 of the battery case 2 is arranged. It is placed on the top. The upper end E1 of the flow path ports 231a and 331a of the first liquid flow path 231 and the second liquid flow path 331 (FIG. 12 shows only the flow path port 231a of the first liquid flow path 231) is the terminal surface of the cell 10. It may be arranged below 10a. The liquid leaking from the communication sites between the flow path ports 231a and 331a of the first liquid flow path 231 and the second liquid flow path 331 may infiltrate into the cell accommodating portion 20 from the first joint portion WL1. However, it is possible to prevent the electrode terminals 11 and 11 of the cell 10 from being exposed to water.

Further, as shown in FIG. 4, the flow path ports 231a and 331a of the first liquid flow path 231 and the second liquid flow path 331, respectively (FIG. 4 shows only the flow path port 231a of the first liquid flow path 231). The upper end E1 may be arranged below the lower end E2 of the second insertion hole 41 of the plate-shaped member 4. According to such an arrangement, the liquid leaking from the communication portions between the flow path ports 231a and 331a of the first liquid flow path 231 and the second liquid flow path 331 is arranged above the flow path ports 231a and 331a. Since it becomes difficult to reach the communication sites of the first insertion hole 321 and the second insertion hole 41, it is possible to effectively prevent the liquid from entering the cell accommodating portion 20 through the first insertion hole 321 and the second insertion hole 41. be able to.

In the above embodiment, the first liquid flow path 231 of the battery case 2 is provided on the side wall portions 23 and 23 of the battery case 2, respectively, but may be provided on the bottom wall portion 22 of the battery case 2. In this case, the second liquid flow path 331 of the electric component case 3 is also provided on the bottom wall portion 31 of the electric component case 3. Further, the number of battery cases 2 joined to the electric component case 3 is not limited to two, and may be only one.

1 Battery pack 2 Battery case 2a End face 2b (of battery case) Outer peripheral edge 20 Cell housing part 20a Opening 231 First liquid flow path 231a (first liquid flow path) Flow path port 3 Electrical component case 30 Electrical component housing 32 End wall 321 First insertion hole 331 Second liquid flow path 331a (second liquid flow path) flow path port 34 Electrical component 4 Plate-shaped member 4a (plate-shaped member) outer peripheral edge 41 Second insertion hole 10 cell 10a Terminal Surface 11 Electrode terminal 200,201 Sealing member E1 (of the flow path port) Upper end E2 (of the first insertion hole and the second communication hole) Lower end WL1 First joint WL2 Second joint

Claims (5)

A tubular battery case that houses the cell through an opening located on the end face,
An electric component case arranged so as to cover the end face of the battery case and accommodating the electric component,
A plate-shaped member arranged between the battery case and the electric component case so as to close the opening of the battery case is provided.
The battery case has a first liquid flow path having a flow path opening on the end face thereof.
The electric component case has a second liquid flow path whose flow path port opens toward the end face of the battery case.
The battery case and the plate-shaped member are joined by a first joint portion along the entire circumference of the outer peripheral edge of the plate-shaped member.
The battery case and the electric component case are joined by a second joint along the entire circumference of the outer peripheral edge of the end face of the battery case.
A battery pack in which the first liquid flow path and the flow path ports of the second liquid flow path communicate with each other outside the first joint portion and inside the second joint portion. The electric component case is a first insertion capable of inserting an end wall portion arranged parallel to the end surface of the battery case and a connecting component provided on the end wall portion and electrically connected to the electric component. With holes,
The plate-shaped member has a second insertion hole for communicating the inside of the battery case and the inside of the electric component case corresponding to the first insertion hole.
The first insertion hole and the second insertion hole are sealed by a sealing member with respect to the outside of the first insertion hole and the second insertion hole between the electric component case and the plate-shaped member. , The battery pack according to claim 1. The battery case, the electric component case, and the plate-shaped member are made of metal.
The battery pack according to claim 1 or 2, wherein the first joint and the second joint are joints formed by welding or friction stir welding. The cell has a terminal surface on which positive and negative electrode terminals are arranged together.
When the direction in which the terminal surface of the cell in the cell accommodating portion faces is above the battery case, the upper ends of the flow path ports of the first liquid flow path and the second liquid flow path are the above. The battery pack according to any one of claims 1 to 3, which is arranged below the terminal surface of the cell. Claims 1 to 4 wherein the upper end of each of the first liquid flow path and the second liquid flow path is arranged below the lower end of the second insertion hole of the plate-shaped member. The battery pack according to any one of the above.

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