CN212209644U

CN212209644U - Battery module

Info

Publication number: CN212209644U
Application number: CN202021232823.4U
Authority: CN
Inventors: 马豪; 孙东升; 刘军辉; 杨慧杰; 颜廷露
Original assignee: China Aviation Lithium Battery Research Institute Co Ltd
Current assignee: AVIC Innovation Technology Research Institute (Jiangsu) Co.,Ltd.
Priority date: 2020-06-29
Filing date: 2020-06-29
Publication date: 2020-12-22
Anticipated expiration: 2030-06-29

Abstract

The utility model relates to a battery field discloses a battery module. The battery module comprises a plurality of single batteries which are sequentially stacked along the stacking direction to form a battery pack; the wire harness isolation plate is arranged on the base plate and comprises a plurality of single batteries which are connected in series or in parallel; the battery pack further comprises a second connecting sheet, wherein the second connecting sheet comprises a lap joint part and an output part, the lap joint part is positioned on one surface, facing the battery pack, of the first connecting sheet, and the lap joint part is electrically connected with the first connecting sheet; the output part is used for being electrically connected with an external component of the battery module; the wiring harness isolation plate is provided with a supporting structure for supporting the lap joint part. In the embodiment, the height of the second connecting piece is reduced through the laminated structure design of the battery module, so that the installation heights of the output pole base and the protective cover are effectively reduced.

Description

Battery module

Technical Field

The utility model relates to a battery field especially relates to a battery module.

Background

There is an increasing interest in the industry to increase the energy density of a module (the volumetric energy density is equal to the ratio of the total energy to the volume of the module), i.e., to increase the energy density under the design requirements of the german automobile industry association (VDA) standard module, or to decrease the overall size of the module under the same electrical requirement of the module.

Referring to a partial structure view of a battery module shown in fig. 1, the battery module includes a module frame 01, a plurality of unit cells (not shown) are disposed in the module frame 01, and the unit cells are sequentially stacked in a stacking direction to form a battery pack; the battery module further comprises a first connecting sheet 02 and a second connecting sheet 03, wherein the first connecting sheet 02 is used for connecting the single batteries in series or in parallel, the second connecting sheet 03 and the first connecting sheet 02 are of an integrated structure, and the second connecting sheet 03 is used as an output electrode of the battery module and is electrically connected with an external connecting part of the battery module. The module frame 01 is provided with a wiring harness isolation plate 06, and the first connecting piece 02 is positioned in the wiring harness isolation plate 06; the second connecting pieces 03 are located at two ends of the module frame 01 and fixedly connected with an output pole base 04 arranged on an end plate of the module frame, and a protective cover 05 is arranged on the output pole base 04 to form insulation protection for the second connecting pieces 03.

Because the second connecting piece 03 and the first connecting piece 02 are of an integral structure, in order to match the height of the second connecting piece 03, the output pole base 04 must be installed at a corresponding height, and at this time, as shown in fig. 2, the top of the protective cover 05 protrudes out of the top surface of the whole module, so that the overall height of the module is affected, and the increase of the volume energy density of the module is not facilitated.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery module has reduced the height of second connection piece through lamination formula structural design to the mounting height of output pole base and visor has effectively been reduced.

The embodiment of the utility model provides a battery module, including a plurality of battery cells, a plurality of battery cells stack in proper order along stacking direction in order to form the group battery;

the wire harness isolation plate is used for connecting the plurality of single batteries in series or in parallel;

the battery pack further comprises a second connecting sheet, wherein the second connecting sheet comprises a lap joint part and an output part, the lap joint part is positioned on one surface, facing the battery pack, of the first connecting sheet, and the lap joint part is electrically connected with the first connecting sheet; the output part is used for being electrically connected with an external component of the battery module;

and a supporting structure for supporting the lap joint part is arranged on the wire harness isolation plate.

In the above embodiment, the second connecting piece and the first connecting piece are designed in a split structure, and the second connecting piece is overlapped with the first connecting piece and is located below the first connecting piece, so that the height of the second connecting piece is reduced, and the mounting heights of the output electrode base and the protective cover are further reduced; meanwhile, a supporting structure used for supporting the lap joint part is arranged on the wire harness isolation plate and is arranged between the lap joint part and the battery, so that the lap joint part is far away from the battery, and the lap joint part is prevented from contacting with a shell of the battery.

Drawings

Fig. 1 is a partial schematic view of a battery module provided in the prior art;

fig. 2 is a schematic view of the battery module shown in fig. 1 after the output electrode base and the protective cover are assembled;

fig. 3 is a partial schematic view of a battery module according to an embodiment of the present invention;

fig. 4 is a schematic view of the battery module shown in fig. 3 after the output electrode base and the protective cover are assembled;

fig. 5 is a schematic connection diagram of a first connection piece and a second connection piece according to an embodiment of the present invention;

fig. 6 is a partial schematic view of a wire harness isolation plate according to an embodiment of the present invention;

fig. 7 is an overall structure diagram of a wire harness isolation board provided in an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a flexible circuit board according to an embodiment of the present invention.

Reference numerals:

the prior art is as follows:

01-Module frame

02-first connecting piece 03-second connecting piece

04-output pole base 05-protective cover

06-harness partition board

The application:

10-module frame

20-first connecting piece

30-second connecting sheet

301-lap joint 302-output

40-output pole base 50-protective cover

60-harness isolation board

601-support structure 602-accommodation groove

603-first supporting structure 604-first receiving groove

605-groove structure

70-flexible circuit board

701-body part 702-bending part 703-notch

80-switching piece

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The embodiment of the utility model provides a battery module, this battery module have reduced the height of second connection piece through lamination formula structural design to the mounting height of output pole base and visor has effectively been reduced.

Specifically, the battery module comprises a plurality of single batteries which are sequentially stacked along the stacking direction to form a battery pack;

the wire harness isolation plate is arranged on the base plate and comprises a plurality of single batteries which are connected in series or in parallel;

the wiring harness isolation plate is provided with a supporting structure for supporting the lap joint part.

For a clearer understanding of the structure of the battery module provided by the embodiments of the present invention, the detailed description will be given with reference to the accompanying drawings.

Referring to fig. 3, 4 and 5 together, the battery module includes a module frame 10, a plurality of unit cells (not shown) are disposed in the module frame 10, and are sequentially stacked in a stacking direction to form a battery pack, and each unit cell has opposite poles; the battery pack further comprises a wiring harness isolation plate 60, wherein the wiring harness isolation plate 60 is positioned above the battery pack, a first connecting piece 20 is arranged on the wiring harness isolation plate 60, and the first connecting piece 20 is used for connecting a plurality of single batteries in series or in parallel; the battery pack further comprises a second connecting sheet 30, the second connecting sheet 30 and the first connecting sheet 20 are designed in a split structure, the second connecting sheet 30 comprises a bridging portion 301 and an output portion 302, the bridging portion 301 is located on one surface, facing the battery pack, of the first connecting sheet 20, the bridging portion 301 is electrically connected with the first connecting sheet 20, and the output portion 302 is used for being electrically connected with an external component of the battery module. In the battery module, since the bridging portion 301 is located below the first connecting plate 20, the heights of the bridging portion 301 and the output portion 302 are reduced when the height of the first connecting plate 20 is kept unchanged, so that the mounting heights of the output pole base 40 and the protective cover 50 matched with the output portion 302 are reduced, and the influence of the too high mounting height of the protective cover 50 on the overall height of the module is avoided, compared with the prior art.

Specifically, as shown in fig. 5, a part of the overlapping portion 301 is covered with the first connecting piece 20, and the other part is exposed from below the first connecting piece 20; alternatively, the entire overlapping portion 301 may be disposed directly below the first connecting piece 20. The bridging portion 301 and the first connecting piece 20 may be electrically connected by soldering, or may be electrically connected by other methods. Overlap joint portion 301 is perpendicular mutually with output portion 302, and passes through the fillet and connect between overlap joint portion 301 and the output portion 302, and the assembly back, output portion 302 is located the outside of pencil division board 60, because overlap joint portion 301 is less than first connecting piece 20, then be equipped with on the frame of pencil division board 60 with the fillet complex dodge the structure, if be provided with the breach structure in the position that corresponds.

Be equipped with on the pencil division board 60 and be used for supporting bearing structure 601 of overlap joint portion 301, bearing structure 601 is between overlap joint portion 301 and battery, when playing the supporting role to overlap joint portion 301, bearing structure 601 still makes and has certain clearance between overlap joint portion 301 and the battery, avoids overlap joint portion 301 and the shell contact of battery, causes trouble such as battery short circuit.

The supporting structures 601 may contact only a portion of the area on the bottom surface of the overlapping part 301 (the surface of the overlapping part 301 facing the battery), and the number of the supporting structures 601 may be one or more, and when a plurality of supporting structures 601 are provided, the supporting structures 601 are respectively located at different positions of the overlapping part 301, and jointly play a supporting role; at this time, since a part of the bottom surface of the overlapping part 301 is exposed to the battery, in order to prevent the overlapping part 301 from contacting the outer case of the battery by an external force, an insulating material, which may be epoxy resin or PVC, may be coated on the bottom surface of the overlapping part 301 to form an insulating layer, and the thickness of the insulating layer is not less than 0.3mm, so that the insulating layer can form an insulating protection between the overlapping part 301 and the battery. Alternatively, the supporting structure 601 may contact the entire bottom surface of the bridging portion 301, and the supporting structure 601 may support and completely isolate the bridging portion 301 from the battery, thereby forming an insulation protection.

The supporting structure 601 can be used for supporting the bridging portion 301 and also can be used for supporting the first connecting plate 20, specifically, the supporting structure 601 comprises a first supporting surface and a second supporting surface, and the vertical distance between the first supporting surface and the battery pack is greater than the vertical distance between the second supporting surface and the battery pack; wherein the first support surface is used for supporting the first connection piece 20 and the second support surface is used for supporting the bridging portion 301, i.e. there is a height difference between the first support surface and the second support surface, and the height difference is exactly equal to the thickness of the bridging portion 301.

As shown in fig. 6, the wire harness isolation plate 60 is further provided with an accommodating groove 602 for accommodating the overlapping portion 301, the shape of the accommodating groove 602 is the same as that of the overlapping portion 301, and the accommodating groove 602 plays a role in limiting during installation. The supporting structure 601 is located in the receiving groove 602, the supporting structure 601 and the receiving groove 602 may be manufactured through an integrated molding process, in a specific embodiment, as shown in fig. 6, the supporting structure 601 covers a bottom surface of the receiving groove 602, and the supporting structure 601 is an insulating plate interposed between the overlapping part 301 and the battery, so that the supporting structure 601 contacts with the entire bottom surface of the overlapping part 301, thereby isolating the overlapping part 301 from the battery and forming an insulating protection therebetween; in another specific embodiment, the supporting structures 601 are disposed along the frame of the receiving groove 602, the number of the supporting structures 601 may be one or more, the supporting structures 601 contact a portion of the area on the bottom surface of the overlapping portion 301, and the supporting structures 601 may be disposed in a variety of different manners, such as when the receiving groove 602 is a polygonal structure, one supporting structure 601 may be disposed at each corner position of the receiving groove 602, or one or more supporting structures 601 may be disposed along the frame of the receiving groove 602; in other embodiments, if the supporting structures 601 are respectively connected to two opposite sides of the receiving groove 602, a beam is formed in the receiving groove 602, or the supporting structures 601 may be arranged in a grid shape and disposed at the bottom of the receiving groove 602, which is not illustrated herein.

As shown in fig. 7, the wire harness isolation plate 60 is further provided with a support structure, referred to as a first support structure 603, for supporting the first connection piece 20, and a receiving groove, referred to as a first receiving groove 604, for receiving the first connection piece 20, wherein the first support structure 603 is located in the first receiving groove 604, which will not be described in detail herein.

Still be equipped with flexible circuit board 70 on the pencil division board 60, flexible circuit board 70 is rectangular form, and sets up along battery cell's the direction of stacking, battery cell's the direction of stacking is unanimous with the length direction of pencil division board 60, in other words, flexible circuit board 70 extends along the length direction of pencil division board 60, and on the width direction of pencil division board 60, flexible circuit board 70 is in the intermediate position of pencil division board 60, the both sides of flexible circuit board 70 are provided with a plurality of first connecting piece 20, first connecting piece 20 is used for being connected with battery cell's positive post or negative pole post electricity. In the prior art, the space that flexible circuit board 70 took in the width is great, consequently, for guaranteeing the ability of overflowing of first connecting piece 20, in the prior art, the thickness of first connecting piece 20 is thicker, can influence the whole height of module like this, is unfavorable for improving the volume energy density of module. In the application, the ratio of the width of the flexible circuit board 70 to the width of the wire harness isolation plate 60 is between 1:5 and 1:4, and the width of the flexible circuit board 70 is narrowed, so that the width of the first connection piece 20 can be relatively increased, and thus, on the premise of ensuring the overcurrent capacity, the thickness of the first connection piece 20 can be reduced, compared with the prior art, the height and space occupied by the whole module is reduced, and the volume energy density of the module is favorably improved.

Meanwhile, as shown in fig. 8, in order to ensure that the flexible circuit board 70 has expansion and impact resistance, the flexible circuit board 70 is provided with a plurality of body portions 701 and bending portions 702 arranged at intervals along the length direction, and the bending portions 702 are folded portions on the flexible circuit board 70, and correspondingly, as shown in fig. 7, the harness isolation plate 60 is provided with groove structures 605 which are matched with the bending portions 702 one by one, so that when the flexible circuit board 70 is subjected to expansion force and impact force inside the battery module, the bending portions 702 can provide deformation allowance; and/or two side edges of the flexible circuit board 70, which are parallel to the length direction, are respectively provided with a plurality of notches 703, and when the flexible circuit board 70 is subjected to an expansion force and an impact force inside the battery module, the notches 703 can deform.

With continued reference to fig. 8, the plurality of interposer 80 are disposed on the flexible circuit board 70, the interposer 80 may be a nickel plate, the interposer 80 is electrically connected to the flexible circuit board 70 and the corresponding first connection plate 20, and a notch 703 is disposed on each of two sides of each interposer 80, so that when the flexible circuit board 70 is subjected to an expansion force and an impact force inside the battery module, good contact between the interposer 80 and the first connection plate 20 can be ensured through deformation of the notch 703.

As can be seen from the above description, the embodiment of the present invention reduces the height of the second connecting piece through the laminated structure design, thereby effectively reducing the installation height of the output electrode base and the protective cover; meanwhile, the support structure for supporting the lap joint part is arranged on the wire harness isolation plate, so that the lap joint part is far away from the battery, and the lap joint part is prevented from contacting with the shell of the battery.

It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A battery module including a plurality of unit cells sequentially stacked in a stacking direction to form a battery pack,

2. The battery module as set forth in claim 1, wherein the support structure comprises a first support surface and a second support surface, and a vertical distance between the first support surface and the battery pack is greater than a vertical distance between the second support surface and the battery pack;

the first supporting surface is used for supporting the first connecting sheet, and the second supporting surface is used for supporting the overlapping part.

3. The battery module according to claim 1, wherein the harness isolation plate is further provided with a receiving groove for receiving the overlapping portion, and the support structure is located in the receiving groove.

4. The battery module according to claim 3, wherein the support structure is an insulating plate covering the bottom surface of the receiving groove.

5. The battery module according to claim 3, wherein the plurality of support structures are disposed around the frame of the receiving groove.

6. The battery module according to claim 3, wherein the frame portion of the receiving groove overlapping the first connection tab is configured to support the first connection tab.

7. The battery module according to claim 1, wherein the support structure is in contact with a portion of the bottom surface of the bridging part or with the entire bottom surface of the bridging part;

when the support structure is in contact with a portion of the bottom surface of the lap joint, the bottom surface of the lap joint is coated with an insulating layer.

8. The battery module according to claim 1, wherein the bridging part is disposed perpendicular to the output part, and the bridging part and the output part are connected by a rounded part;

and an avoiding structure matched with the round corner part is arranged on the frame of the wire harness isolation plate.

9. The battery module according to claim 1, wherein a flexible circuit board is further provided on the harness separator, the flexible circuit board having an elongated shape and being disposed in a stacking direction of the plurality of unit cells, and a ratio of a width of the flexible circuit board to a width of the harness separator is between 1:5 and 1: 4.

10. The battery module according to claim 9, wherein the flexible circuit board has a plurality of body portions and bending portions spaced apart from each other along a length direction, and the harness isolation plate has a groove structure engaged with the bending portions;

and/or a plurality of adapter plates are arranged on the flexible circuit board, each adapter plate is electrically connected with one corresponding first connecting plate, and gaps are respectively arranged on two sides of each adapter plate of the flexible circuit board.