JP7172728B2 - battery pack - Google Patents

Description

The present disclosure relates to battery packs.

For example, Japanese Patent Application Laid-Open No. 2018-60740 (hereinafter referred to as “Patent Document 1”) discloses a pair of battery cells arranged adjacent to each other, a bus bar electrically connecting the battery cells, is disclosed. The busbar is formed in a plate shape. The busbar has a pair of fixing portions connected to the electrode terminals of the pair of battery cells, and a connecting portion connecting the pair of fixing portions. The connection part is rotated at an angle of 90 degrees with respect to the fixed part with an axis parallel to the longitudinal direction (the direction connecting the pair of fixed parts) as the rotation axis, and is erected with respect to the fixed part. A displacement absorbing piece is formed. Due to the displacement absorbing pieces, the bus bar is formed such that the fixed portions are relatively displaceable in the width direction (the direction perpendicular to the length direction in the plane including the electrode terminals). Furthermore, the displacement absorbing piece has a wave-like bent portion. The bent portion is formed so as to expand and contract in the length direction by undulating in the width direction.

JP 2018-60740 A

In the battery pack described in Patent Document 1, when one battery cell is displaced with respect to the other battery cell along the direction in which the battery cells are arranged, the stress generated in the bus bar and the stress generated on the other battery cell along the width direction Although the stress generated in the busbar when the other battery cell is displaced with respect to the other battery cell is relieved, it is The stress generated in the busbar when the other battery cell is displaced with respect to the cell is not relieved.

An object of the present disclosure is to provide a bus bar when the second secondary battery is displaced with respect to the first secondary battery along the direction in which the secondary batteries are arranged, the width direction of the secondary batteries, and the height direction of the secondary batteries. Another object of the present invention is to provide a battery pack capable of relieving the stress generated in the battery pack.

A battery pack according to the present disclosure includes a first secondary battery, a second secondary battery, and a busbar electrically connecting the first secondary battery and the second secondary battery. Each of the first secondary battery and the second secondary battery includes a container, a positive electrode terminal provided outside the container, and a negative electrode terminal provided outside the container. The bus bar is formed in a spiral shape centering on an axis parallel to the direction in which the positive electrode terminal of the first secondary battery and the negative electrode terminal of the second secondary battery are arranged.

In the present battery pack, the bus bar is formed in a spiral shape centered on an axis parallel to the terminal arrangement direction in which the positive electrode terminal of the first secondary battery and the negative electrode terminal of the second secondary battery are arranged. In addition to the stress generated in the busbar when the second secondary battery is displaced with respect to the first secondary battery along the direction, the second secondary battery is stressed with respect to the first secondary battery in the plane orthogonal to the terminal arrangement direction. The stress generated in the busbar when the battery is displaced is also relieved. Therefore, the stress generated in the bus bar when the second secondary battery is displaced with respect to the first secondary battery along the direction in which the secondary batteries are arranged, the width direction of the secondary batteries, and the height direction of the secondary batteries is mitigated.

Moreover, it is preferable that the dimension in the width direction of the bus bar is constant over the entire length of the bus bar.

As described above, according to the present disclosure, the second secondary battery is arranged with respect to the first secondary battery along the direction in which the secondary batteries are arranged, the width direction of the secondary batteries, and the height direction of the secondary batteries. It is possible to provide a battery pack capable of relieving the stress generated in the busbar when the battery is displaced.

1 is a plan view schematically showing the configuration of a battery pack according to an embodiment of the present disclosure; FIG. FIG. 2 is a side view of the battery pack shown in FIG. 1;

Embodiments of the present disclosure will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are given the same numbers.

FIG. 1 is a plan view schematically showing the configuration of a battery pack according to one embodiment of the present disclosure. 2 is a side view of the battery pack shown in FIG. 1. FIG. This battery pack 1 is mounted, for example, in the interior of a vehicle. As shown in FIG. 1, the battery pack 1 of this embodiment includes a first secondary battery 10A, a second secondary battery 10B, and a busbar 20. As shown in FIG. Note that the battery pack 1 may include three or more secondary batteries.

The first secondary battery 10A and the second secondary battery 10B are arranged side by side in one direction. Each secondary battery 10A, 10B has the same configuration. Each secondary battery 10A, 10B has a container 11, a positive terminal 12, and a negative terminal 13. As shown in FIG.

The container 11 is formed in a rectangular parallelepiped shape. The container 11 is arranged such that the thickness direction of the container 11 is parallel to the one direction. Hereinafter, the direction in which the container 11 of the first secondary battery 10A and the container 11 of the second secondary battery 10B are arranged is referred to as the "container arrangement direction". The container 11 contains a positive electrode (not shown), a negative electrode (not shown), a separator (not shown), an electrolytic solution, and the like. The positive electrode, negative electrode, and electrolyte are made of materials that expand and contract according to the state of charge and temperature. A spacer (not shown) made of an insulating material may be arranged between the containers 11 adjacent to each other.

The positive terminal 12 and the negative terminal 13 are provided on the top of the container 11 . The positive electrode terminal 12 and the negative electrode terminal 13 have shapes protruding upward from the upper surface of the container 11 . The positive electrode terminal 12 and the negative electrode terminal 13 are formed in a plate shape. As shown in FIG. 1, the positive terminal 12 and the negative terminal 13 are positioned apart from each other in the width direction of the container 11 (the direction perpendicular to the arrangement direction of the container in the plane including the positive terminal 12 and the negative terminal 13). are placed in

The busbar 20 electrically connects the first secondary battery 10A and the second secondary battery 10B. In this embodiment, the bus bar 20 connects the positive terminal 12 of the first secondary battery 10A and the negative terminal 13 of the second secondary battery 10B.

The busbar 20 is a spiral with an axis parallel to the direction in which the positive terminal 12 of the first secondary battery 10A and the negative terminal 13 of the second secondary battery 10B are arranged (hereinafter referred to as the "terminal arrangement direction"). formed in the shape of The direction in which the terminals are arranged is not limited to the direction parallel to the direction in which the containers are arranged, and includes a direction slightly inclined with respect to the direction in which the containers are arranged. For example, when the bus bar 20 is connected to the widthwise inner portion of the positive terminal 12 of the first secondary battery 10A and the widthwise outer portion of the negative electrode terminal 13 of the second secondary battery 10B, The direction in which the connecting portions are connected (the direction in which the terminals are arranged) is slightly inclined with respect to the direction in which the containers are arranged. The present disclosure also includes such aspects.

The bus bar 20 is formed by spirally processing a long flat plate made of metal. The thickness of the flat plate is constant over the entire length of the flat plate. The dimension of the flat plate in the width direction (the direction perpendicular to both the longitudinal direction and the thickness direction of the flat plate) is constant over the entire length of the flat plate.

The busbar 20 has a first connection portion 21 , a second connection portion 22 and an intermediate portion 23 .

The first connection portion 21 is formed at one end of the bus bar 20 . The first connection portion 21 is connected to the positive electrode terminal 12 of the first secondary battery 10A by welding, bolts, or the like.

The second connection portion 22 is formed at the other end of the bus bar 20 . The second connection portion 22 is connected to the negative electrode terminal 13 of the second secondary battery 10B by welding, bolts, or the like.

The intermediate portion 23 is formed between the first connection portion 21 and the second connection portion 22 . In this embodiment, the intermediate portion 23 has a shape that makes one rotation about the axis between the first connection portion 21 and the second connection portion 22 . However, the intermediate portion 23 may be formed in a shape that makes two or more turns about the axis between the first connection portion 21 and the second connection portion 22 .

In the battery pack 1 described above, the second secondary battery 10B may be displaced with respect to the first secondary battery 10A due to vibration or charging/discharging of the secondary batteries 10A and 10B.

However, in the battery pack 1 of the present embodiment, the bus bar 20 is formed in a spiral shape centered on an axis parallel to the direction in which the terminals are arranged. In addition to stress generated in bus bar 20 when second secondary battery 10B is displaced, bus bar 20 is stressed when second secondary battery 10B is displaced with respect to first secondary battery 10A in a plane perpendicular to the terminal arrangement direction. The stress generated in the Therefore, when the second secondary battery 10B is displaced with respect to the first secondary battery 10A along the direction in which the secondary batteries are arranged, the width direction of the secondary batteries, and the height direction of the secondary batteries, the bus bar 20 is displaced. The resulting stress is relieved.

Moreover, it is possible to reduce the stress generated in the bus bar 20 while shortening the dimension in the direction in which the containers are arranged.

It should be noted that the embodiments disclosed this time are illustrative in all respects and should not be considered restrictive. The scope of the present invention is indicated by the scope of the claims rather than the description of the above-described embodiments, and includes all modifications within the meaning and scope equivalent to the scope of the claims.

For example, the first connection portion 21 and the second connection portion 22 may be formed flat.

Further, the first secondary battery 10A and the second secondary battery 10A are arranged so that the positive terminal 12 and the negative terminal 13 of the first secondary battery 10A and the positive terminal 12 and the negative terminal 13 of the second secondary battery 10B are aligned in a straight line. The secondary battery 10B may be arranged, and the bus bar 20 may connect the positive electrode terminal 12 of the first secondary battery 10A and the negative electrode terminal 13 of the second secondary battery 10B. In this case, the container arrangement direction is parallel to the width direction of the container 11 .

1 battery pack, 10A first secondary battery, 10B second secondary battery, 11 container, 12 positive electrode terminal, 13 negative electrode terminal, 20 busbar, 21 first connection portion, 22 second connection portion, 23 intermediate portion.

Claims (1)

a first secondary battery;
a second secondary battery;
a bus bar electrically connecting the first secondary battery and the second secondary battery,
The first secondary battery and the second secondary battery are
a container;
a positive electrode terminal provided outside the container;
a negative electrode terminal provided outside the container,
The busbar is a flat plate having a uniform thickness and elongated in one direction, and the thickness of the flat plate and the dimension in the width direction orthogonal to both the longitudinal direction of the flat plate are constant throughout the longitudinal direction. The flat plate is spirally formed around an axis parallel to the direction in which the positive electrode terminal of the first secondary battery and the negative electrode terminal of the second secondary battery are arranged. A battery pack.

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