CN213959052U

CN213959052U - Battery module

Info

Publication number: CN213959052U
Application number: CN202022977951.8U
Authority: CN
Inventors: 嶋田匡起; 伊藤秀太
Original assignee: Toyota Motor Corp
Current assignee: Toyota Motor Corp
Priority date: 2020-12-11
Filing date: 2020-12-11
Publication date: 2021-08-13
Anticipated expiration: 2030-12-11

Abstract

The utility model provides a battery module. The battery module comprises a plurality of battery monomers accommodated in a retainer and a bus module for connecting the battery monomers with each other, wherein the bus module is provided with a first resin strip, a second resin strip and a plurality of bus plates fixed on the first resin strip and the second resin strip, the first resin strip and the second resin strip are respectively placed at two end parts of the top surface of the retainer and extend along the arrangement direction of the battery monomers, the bus plates are respectively jointed with terminals of the battery monomers, a first bulging part and a second bulging part which bulge towards the outer side are respectively formed at the upper parts of two longitudinal side walls of the retainer extending along the arrangement direction of the battery monomers, and the first bulging part and the second bulging part respectively comprise upper surfaces which are flush with the top surface of the retainer and inclined plane-shaped side surfaces which extend from the outer end edge and the inner side of the upper surface and are connected with the longitudinal side walls. With this structure, the bus bar module can be prevented from being used as a holding portion when the battery module is transported.

Description

Battery module

Technical Field

The utility model relates to a battery module.

Background

A vehicle such as an electric vehicle or a hybrid vehicle is provided with a battery module (also referred to as a secondary battery) for driving the vehicle. The battery module is formed by connecting a plurality of battery cells accommodated in a holder together by a bus bar module.

In the battery module, the bus bar module is configured by fixing a plurality of bus bars to a plurality of positions in the longitudinal direction of the first resin bar and the second resin bar. Generally, the first resin strip and the second resin strip are merely placed on the top surface of the holder without being fixed with a fastening member or the like.

Each bus bar plate is joined to the positive electrode terminals of the cells in the odd-numbered rows or the negative electrode terminals of the cells in the even-numbered rows, for example, by welding. The first and second resin strips are not separated from the holder by the bonding force between the terminals (positive and negative terminals) of the battery cells and the bus bar plates.

When the battery module is transported, the correct holding part is the corner between the vertical side wall and the bottom wall of the retainer. That is, the operator should lift the battery module so as to hold the corner portions between the vertical side walls and the bottom wall on both sides of the holder with both hands. However, in a case where an operator may lift the battery module while holding the bus bar module (the first resin bar or the second resin bar), a weight load may be applied to a joint portion where the bus bar plate and the terminals of the battery cells are joined via the first resin bar and the second resin bar, and the joint portion may be broken.

SUMMERY OF THE UTILITY MODEL

In view of the above, an object of the present invention is to provide a battery module that can prevent a bus bar module from being used as a holding portion during transportation.

As a technical solution to solve the technical problem, the utility model provides a battery module, this battery module include arrange into a row a plurality of battery monomer of holding in the holder, and will a plurality of battery monomer bus bar modules of connecting each other, bus bar module has first resin strip, second resin strip, and fixes first resin strip with a plurality of bus-bar boards on the second resin strip, first resin strip with the second resin strip is place respectively two tip of the top surface of holder, and is followed the free array direction of battery extends, a plurality of bus-bar boards respectively with the free terminal joint of a plurality of batteries, its characterized in that: the upper portions of two longitudinal side walls of the holder, which extend in the arrangement direction of the battery cells below the first resin strip and the second resin strip, are respectively formed with a first bulging portion and a second bulging portion that bulge outward, and the first bulging portion and the second bulging portion each have an upper surface flush with the top surface of the holder and a side surface in the shape of an inclined plane that extends downward and inward from the outer edge of the upper surface and is connected to the longitudinal side walls.

The utility model discloses an above-mentioned battery module's advantage lies in, can prevent that the generating line module is regarded as the position of controlling when carrying battery module. Specifically, since the first bulging portion and the second bulging portion formed at the upper portion of the vertical side wall of the holder each have an upper surface flush with the top surface of the holder and a side surface in the shape of an inclined surface extending downward and inward from the outer edge of the upper surface and continuous with the vertical side wall, if an operator grips the region from the first resin strip and the second resin strip of the bus bar module to the first bulging portion and the second bulging portion with both hands by mistake when carrying the battery module, the fingers slide along the side surfaces in the shape of the inclined surfaces of the first bulging portion and the second bulging portion and cannot lift the battery module with force, and therefore the operator lifts the battery module only by gripping the corner portion between the bottom wall of the holder and the vertical side wall with both hands.

As a result, it is possible to effectively avoid the occurrence of a situation in which a weight load is applied to the joint portion where the bus bar plate and the terminals of the battery cells are joined via the first resin bars and the second resin bars due to an incorrect gripping portion when the battery module is transported.

In addition, in the above battery module of the present invention, preferably, the first bulging portion and the second bulging portion are located at outer edges of respective upper surfaces of the first resin strip and the second resin strip, respectively.

With this structure, when the side portion of the battery module collides with a foreign object, the foreign object first collides with the first bulging portion located outside the first resin strip or the second bulging portion located outside the second resin strip. Thus, foreign objects can be prevented from directly hitting the first resin strip or the second resin strip of the bus bar module. This prevents the first resin strip or the second resin strip from receiving an excessive collision load when a foreign object collides therewith.

Drawings

Fig. 1 is a perspective view showing a battery module according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view in the direction of arrows along the line (2) - (2) in fig. 1.

Fig. 3 is a schematic diagram for explaining a state in which the battery module in fig. 1 is lifted up.

Detailed Description

Hereinafter, an embodiment of a battery module according to the present invention will be described with reference to the drawings.

Fig. 1 is a perspective view showing a battery module according to the present embodiment, and fig. 2 is a cross-sectional view taken along the line (2) - (2) in fig. 1 and taken in the direction of arrows. The battery module 1 shown in fig. 1 and 2 is mounted on a vehicle such as an electric vehicle or a hybrid vehicle as a power source for driving the vehicle to run.

As shown in fig. 1 and 2, a battery module 1 (also referred to as a secondary battery) includes a plurality of battery cells 2, a holder 3, a bus bar module 4, and the like.

Each battery cell 2 is formed in a substantially rectangular parallelepiped shape, and has a rectangular top surface in plan view. A positive electrode terminal 21 protruding upward is provided at one end in the longitudinal direction of the top surface of the battery cell 2, and a negative electrode terminal 22 protruding upward is provided at the other end in the longitudinal direction of the top surface of the battery cell 2.

The plurality of battery cells 2 having the above-described structure are arranged in a row adjacent to each other as shown in fig. 1. As an arrangement form of the plurality of battery cells 2, for example, a form in which the positive electrode terminals 21 of the odd-numbered battery cells 2 and the negative electrode terminals 22 of the even-numbered battery cells 2 are arranged adjacently and grounded may be adopted.

The holder 3 is a member made of an insulating material such as resin, and a plurality of battery cells 2 arranged in a row adjacent to each other are accommodated in the holder 3. A first upper bead 31 and a second upper bead 32 are provided on the top surface of the holder 3 so as to protrude upward. Meanwhile, a first lower protrusion 33 and a second lower protrusion 34 protruding downward are provided on the bottom surface of the holder 3.

More specifically, the first upper bead 31, the second upper bead 32, the first lower bead 33, and the second lower bead 34 are arranged to extend linearly along the longitudinal direction of the holder 3 (the arrangement direction of the battery cells 2), and to be spaced apart from each other by a predetermined distance in the short direction (the direction perpendicular to the arrangement direction of the battery cells 2).

The bus bar module 4 includes a first resin bar 41, a second resin bar 42, and a plurality of bus bars (not shown) fixed to the first resin bar 41 and the second resin bar 42.

The first resin strip 41 and the second resin strip 42 are respectively placed at both ends of the top surface of the holder 3 in the short-side direction (direction perpendicular to the arrangement direction of the battery cells 2), and extend along the long-side direction of the holder 3 (arrangement direction of the battery cells 2).

More specifically, the first resin stripes 41 are placed in parallel to the longitudinal direction of the holder at one end in the short-side direction of the top surface of the holder 3, that is, at the outer side region of the first upper ridge 31 on the top surface of the holder 3; the second resin strip 42 is placed in parallel with the longitudinal direction of the holder on the other end portion in the short-side direction of the top surface of the holder 3, that is, on the outer side of the second upper ridge portion 32 on the top surface of the holder 3.

The bus bar plate is joined to the positive electrode terminals 21 of the cells 2 in the odd-numbered rows and the negative electrode terminals 22 of the cells 2 in the even-numbered rows by welding or the like.

In this manner, the bus bar module 4 is merely placed on the top surface of the holder 3 without being fixed with a fastening member or the like. The bus bar module 4 and the holder 3 are not separated from each other by the coupling force between the terminals (the positive electrode terminal 21 and the negative electrode terminal 22) of the battery cells 2 and the bus bar plate.

In the present embodiment, the first bulging portion 35 and the second bulging portion 36 bulging outward are formed on the upper portions of the two vertical side walls of the holder 3 facing each other in parallel, that is, the two vertical side walls extending in the arrangement direction of the battery cells 2 below the first resin stripe 41 and the second resin stripe 42, respectively. The first and second expanded

portions

35 and 36 are formed such that a cross section perpendicular to the longitudinal direction of the holder 3 is substantially a right triangle.

More specifically, each of the first bulging portion 35 and the second bulging portion 36 has an upper surface flush with the top surface of the holder 3, and a side surface in the shape of an inclined plane extending downward and inward from the outer end edge of the upper surface and continuing to a substantially middle region of the longitudinal side wall of the holder 3. The outer end edge of the upper surface of first expanded portion 35 and the outer end edge of the upper surface of second expanded portion 36 are located outside the outer end edge of first resin strip 41 and outside the outer end edge of second resin strip 42, respectively.

As shown in fig. 2, the maximum dimension of the first expanded portion 35 and the second expanded portion 36 extending outward (i.e., the dimension of the outer end edges of the upper surfaces of the first expanded portion 35 and the second expanded portion 36 extending outward) with respect to the outer end edge of the first resin strip 41 and the outer end edge of the second resin strip 42 is a predetermined dimension α.

The predetermined dimension α is a minimum dimension, and is a dimension in which the outer end edges of the upper surfaces of the first expanded portion 35 and the second expanded portion 36 extend outward with respect to the outer end edges of the first resin bar 41 and the second resin bar 42, taking into consideration an assembly tolerance when the first resin bar 41 and the second resin bar 42 are assembled to the holder 3.

Next, a case when the battery module 1 having the above-described structure is lifted will be described.

Fig. 3 is a schematic diagram for explaining a state when the battery module 1 is lifted. As shown in fig. 3, when the battery module 1 is lifted, if the first resin strip 41 and the second resin strip 42 are gripped by both hands to the regions of the first bulging portion 35 and the second bulging portion 36, the fingers slide on the side surfaces of the inclined surfaces of the first bulging portion 35 and the second bulging portion 36, and the battery module 1 cannot be lifted up by force. In this way, the operator can lift the battery module 1 only by gripping the corner between the bottom wall and the vertical side wall of the holder 3 with both hands.

That is, since it is possible to prevent the operator from lifting up the battery module 1 by mistake by using the bus bar module 4 (the first resin bars 41 and the second resin bars 42) as the gripping portions, it is possible to avoid a situation in which a weight load is applied to the joint portions between the bus bar plates and the terminals (the positive terminals 21 and the negative terminals 22) of the battery cells 2 through the first resin bars 41 and the second resin bars 42 when carrying the battery module 1.

As shown in fig. 3, when the side portion of the battery module 1 is hit by the external object 5, the external object 5 first hits the first bulging portion 35 (or the second bulging portion 36) of the holder 3 of the battery module 1, and does not easily directly hit the first resin strip 41 (or the second resin strip 42) of the bus bar module 4. Therefore, the collision load transmitted to the joint portion of the bus bar plate via the first resin bars 41 (or the second resin bars 42) when the battery module 1 collides with the foreign object 5 can be reduced.

As described above, according to the structure of the battery module 1 of the present embodiment, it is possible to prevent an excessive load from being applied to the joint portion between the bus bar plate of the bus bar module 4 and the terminal of the battery cell 2 when the battery module 1 is transported or when the side surface of the battery module 1 is collided.

The present invention is not limited to the embodiments described above, and various modifications and applications can be made.

Claims

1. A battery module including a plurality of battery cells accommodated in a holder in a row, and a bus bar module connecting the plurality of battery cells to each other, the bus bar module having a first resin strip, a second resin strip, and a plurality of bus bars fixed to the first resin strip and the second resin strip, the first resin strip and the second resin strip being respectively placed at both end portions of a top surface of the holder and extending in an arrangement direction of the battery cells, the plurality of bus bars being respectively engaged with terminals of the plurality of battery cells, characterized in that:

a first bulging portion and a second bulging portion bulging outward are formed on upper portions of two longitudinal side walls of the holder extending in the arrangement direction of the battery cells below the first resin strip and the second resin strip, respectively,

the first bulging portion and the second bulging portion each have an upper surface flush with the top surface of the holder, and an inclined-plane-shaped side surface extending downward and inward from an outer end edge of the upper surface to be connected to the longitudinal side wall.

2. The battery module according to claim 1, wherein:

the outer end edges of the respective upper surfaces of the first bulging portion and the second bulging portion are located outside the first resin strip and the second resin strip, respectively.