CN218648092U

CN218648092U - End plate for battery module and battery module

Info

Publication number: CN218648092U
Application number: CN202223166941.1U
Authority: CN
Inventors: 吴志鹏
Original assignee: Chuneng New Energy Co Ltd
Current assignee: Chuneng New Energy Co Ltd
Priority date: 2022-11-28
Filing date: 2022-11-28
Publication date: 2023-03-17
Anticipated expiration: 2032-11-28

Abstract

The utility model provides an end plate and battery module for battery module, the end plate has first surface and the second surface that sets up relatively along its self thickness direction, the first surface be used for with monomer electricity core surface contact in the battery module, the second surface can with the bandage for the battery module is mutually supported, the whole arcwall face that is for the first surface in second surface. The utility model discloses a make the bandage laminate mutually with the second surface that is the arc setting completely when the atress is tensile for the fastening force of bandage is even to each position of second surface of using the end plate, and it is even to guarantee bandage and end plate matched with position atress, avoids stress concentration, guarantees the end plate and to the reliable centre gripping of electric core group, avoids the end plate to warp and the electric core group produces the clearance, thereby improves the structural stability and the reliability of battery module.

Description

End plate for battery module and battery module

Technical Field

The utility model relates to a battery technology field especially relates to an end plate and battery module for battery module.

Background

With the continuous promotion of the theme of environmental protection, the usage amount of electric vehicles increases year by year, a power battery is one of the core energy storage devices of the electric vehicles, and a power battery module has become a main component and a key technology of the power battery. Generally, in order to achieve the voltage and the electric quantity required by the electric vehicle, a plurality of single batteries are arranged to form a module, the plurality of modules are connected in series, and the battery module after being connected in series is installed in a battery box body so as to provide power for the electric vehicle.

To the battery module that single row electricity core is constituteed among the prior art, adopt end plate and bandage to fix to the electricity core group and tie up tightly usually, this kind of mode can guarantee that single row battery module is fixed firm. However, for a battery module consisting of two or more rows of cells, the battery module is fixed by end plates and binding bands in the prior art, for example, chinese patent publication No. CN213936367U discloses a structure of a double-row cell module, which integrally fixes a plurality of rows of cell groups by two end plates and binding bands with longer size. Because the whole width size of battery module is great, the bandage is mostly concentrated in end plate length direction both ends to the fixed effort of electric core group, the end plate middle part does not receive the power of binding of bandage basically, the bandage is inhomogeneous with the end plate atress, and end plate both ends stress concentration, take place the outside hunch-up in tip middle part easily, cause tip middle part and electric core group to have the clearance, and then lead to the end plate to weaken to the fixed strength between the electric core group, thereby influence the structural stability and the reliability of battery module.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides an end plate and battery module for battery module, the atress is inhomogeneous when solving among the prior art when bandage and the end plate in double or multirow battery module and being connected, has stress concentration, leads to the poor problem of battery module structural stability and reliability.

The technical scheme of the utility model is realized like this:

in one aspect, the utility model provides an end plate for battery module, the end plate has first surface and the second surface that sets up relatively along its self thickness direction, the first surface be used for with monomer electricity core surface contact in the battery module, the second surface can with the bandage for the battery module mutually supports, the whole arcwall face that is for the first surface in second surface.

On the basis of the above technical solution, preferably, the second surface protrudes from both ends of the length of the end plate to a side away from the first surface.

Further, preferably, the second surface of the end plate is provided with reinforcing ribs which are arranged along the length direction and the width direction of the end plate in a crossed manner, and the surfaces of the reinforcing ribs matched with the binding bands are integrally arc-shaped surfaces.

Preferably, both ends of the end plate in the length direction are provided with arc angles matched with the binding bands.

On the other hand, the utility model discloses a battery module, including an at least bandage, electric core module and two the end plate, the electric core module include two row at least electric core groups that set up side by side, electric core group includes a plurality of range upon range of monomer electricity core, two the end plate separates and the centre gripping each other electric core module, the end plate with the big face of monomer electricity core contacts, at least one the bandage encircles electric core module and two the end plate outside and with electric core module and end plate surface cooperation.

On the basis of the technical scheme, preferably, the electric core pack fixing device further comprises a first fixing piece and a second fixing piece, wherein the first fixing piece is horizontally arranged between the top surfaces of the electric core packs, the two ends of the length direction of the first fixing piece are fixedly connected with the top surfaces of the end plates respectively, the second fixing piece is horizontally arranged between the two bottom surfaces of the electric core packs, and the two ends of the length direction of the second fixing piece are fixedly connected with the bottom surfaces of the end plates respectively.

Further, preferably, a first connecting plate inserted between two adjacent electric core groups is fixedly arranged in the middle of the first fixing piece along the length direction of the first fixing piece, and the first connecting plate is contacted with the side surface of the electric core group; the middle part of the second fixing part is fixedly provided with a second connecting plate inserted between two adjacent electric core groups along the length direction of the second fixing part, and the second connecting plate is contacted with the side surface of the electric core group.

Furthermore, preferably, the first fixing member, the second fixing member, the first connecting plate and the second connecting plate are connected to the single battery cells in an insulating manner.

Preferably, a first insulating part is arranged between the end plate and the cell module, a second insulating part is arranged between every two adjacent cell groups, and a third insulating part is arranged between the large surfaces of the single cells.

The utility model discloses for prior art following beneficial effect has:

(1) The utility model discloses an end plate for battery module, through set up first surface and second surface relatively in end plate thickness direction, and make second surface and battery module set up into the arcwall face with bandage matched with surface is whole, thereby make the bandage completely laminate with the second surface that is the arc setting when the atress is tensile, make the fastening force of bandage even act on each position of the second surface of end plate, guarantee that the bandage is even with the position atress of end plate matched with, avoid stress concentration, guarantee the end plate to the reliable centre gripping of electric core group, avoid the end plate to warp and the electric core group produces the clearance, thereby improve the structural stability and the reliability of battery module;

(2) The second surface of the end plate is provided with the reinforcing ribs which are arranged along the length direction and the width direction of the end plate in a crossed manner, so that the light weight of the end plate is ensured, and the structural strength of the end plate is improved;

(3) On one hand, the first fixing piece and the second fixing piece are matched with each other to improve the stress strength of the end plates, so that the clamping fixing force of the end plates on the battery cell module is improved, and the overall structural strength of the battery module is ensured; on the other hand, the first fixing piece and the second fixing piece can limit the relative displacement of the battery cell group in the height direction of the battery module, so that the structural stability of the battery module is improved;

(4) Through at first mounting middle part along its fixed setting of length direction insert the first connecting plate between two adjacent electric core groups, second mounting middle part is provided with along its fixed length direction and inserts the second connecting plate between two adjacent electric core groups, can make monomer electricity core side pass through first connecting plate and second connecting plate as the benchmark, thereby guarantee that each monomer electricity core in the electric core group aligns each other on its thickness direction, simultaneously monomer electricity core top and bottom are passed through first connecting piece and second connecting piece as the benchmark, can guarantee that each monomer electricity core in the electric core group aligns each other on its direction of height.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the description below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic perspective view of an end plate for a battery module according to the present invention;

fig. 2 is a schematic plan view illustrating an end plate for a battery module according to the present disclosure;

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

fig. 4 is a schematic plan view of a battery module according to the present invention;

FIG. 5 isbase:Sub>A cross-sectional view taken at A-A of FIG. 4;

fig. 6 is an exploded view of the battery module according to the present disclosure;

FIG. 7 is an enlarged view of a portion of FIG. 5 at B;

reference numerals:

1. an end plate; 11. a first surface; 12. a second surface; 121. reinforcing ribs; 10. a circular arc angle; 2. binding bands; 3. a battery cell module; 31. the electric core group; 310. a single cell; 4. a first fixing member; 5. a second fixing member; 41. a first connecting plate; 51. a second connecting plate; 6. a first insulating member; 7. a second insulating member; 8. and a third insulating member.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, 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 all belong to the protection scope of the present invention.

As shown in fig. 1 and in conjunction with fig. 2, the embodiment of the present invention provides an end plate for a battery module, as the prior art, the end plate 1 has a first surface 11 and a second surface 12 which are oppositely arranged along the thickness direction of the end plate, and the first surface 11 and the second surface 12 are generally parallel to each other and are both flat. The first surface 11 is used for surface contact with the single battery cells 310 in the battery module, and the second surface 12 can be matched with the binding belt 2 for the battery module.

When double-row cells or multiple rows of cells are fixed in groups, two end plates 1 and binding bands 2 with longer sizes are generally selected to fix multiple rows of cell groups 31 integrally. Because the whole width size of battery module is great, bandage 2 is mostly concentrated in end plate 1 length direction both ends to the fixed effort of electric core group 31, end plate 1 middle part does not receive bandage 2's power of binding basically, bandage 2 is inhomogeneous with end plate 1 atress, and end plate 1 both ends stress concentration, take place the outside hunch-up in tip middle part easily, cause tip middle part and electric core group 31 to have the clearance, and then lead to end plate 1 to weakening the fixed strength between electric core group 31, thereby influence battery module's structural stability and reliability.

For this reason, this embodiment is for solving above-mentioned technical problem, the scheme of adoption is, through setting up second surface 12 and for the battery module bandage 2 matched with surface wholly to the arcwall face, thereby make bandage 2 laminate with the second surface 12 that is the arc setting when the atress is tensile completely, make the even use of the fastening force of bandage 2 to the second surface 12 each position of end plate 1, it is even to guarantee bandage 2 and end plate 1 matched with position atress, avoid stress concentration, guarantee the reliable centre gripping of end plate 1 to electric core group 31, avoid end plate 1 to warp and electric core group 31 production clearance, thereby improve the structural stability and the reliability of battery module.

In order to make the fastening tensile force of the binding band 2 uniformly act on the second surface 12, the second surface 12 in the embodiment protrudes from both ends of the length of the end plate 1 to the side far away from the first surface 11, so that after the binding band 2 is surrounded by the periphery of the battery module, the inner surface of the binding band 2 can be in bending fit with the second surface 12 arranged in an arc shape, the uniform stress of the binding band 2 and the end plate 1 is ensured, and the stress concentration is avoided.

In the present embodiment, the arc height of the second surface 12 of the end plate 1 is calculated according to the initial thickness and the end-of-life pressure of the single cell 310.

Because the second surface 12 of the end plate 1 is of an arc-shaped structure, the thickness of the whole end plate 1 is increased, and the weight of the end plate 1 is increased, for this reason, the second surface 12 of the end plate 1 is provided with the reinforcing ribs 121 which are arranged along the length direction and the width direction of the end plate 1 in a crossed manner, and the surfaces of the reinforcing ribs 121 matched with the binding bands 2 are integrally of arc-shaped surfaces. This arrangement can increase the structural strength of the end plate 1 and reduce the weight of the end plate 1.

It should be noted that when the ribs 121 are disposed on the second surface 12, the second surface 12 may be disposed as a plane, so that the ribs 121 protrude outwards along the second surface 12, and the outer surface of the ribs 121 is disposed in an arc shape.

Preferably, both ends of the end plate 1 in the length direction are provided with arc angles 10 matched with the binding bands 2, so that the binding bands 2 and the end plate 1 of the end plate 1 can be in arc transition connection, and stress concentration is avoided.

Referring to fig. 3, 4 and 6, the present embodiment further discloses a battery module, which includes at least one binding band 2, a cell module 3 and two end plates 1.

The cell module 3 includes at least two rows of cell packs 31 arranged side by side, and the cell packs 31 include a plurality of stacked single cells 310. In the present embodiment, the plurality of unit cells 310 in the cell group 31 are arranged in the thickness direction, which can be understood as the large-area interconnection between the unit cells 310. In the present embodiment, the side-by-side arrangement of the cell groups 31 can be understood as that the width-direction sides of the unit cells 310 in the cell group 31 are connected with each other.

Two end plates 1 are spaced each other and centre gripping electric core module 3, and end plate 1 contacts with the big face of monomer electricity core 310. At least one bandage 2 encircles in the outside of electric core module 3 and two end plates 1 and with the cooperation of

electric core module

3 and 1 surface of end plate. In this embodiment, the structural strength of the battery module after binding can be improved by providing two binding bands 2 at an interval from top to bottom.

Because double or multirow battery module width is great, the end plate 1 that corresponds between electric core group 31 and the electric core group 31 probably has the clamp force not enough, leads to taking place the displacement between the electric core group 31, causes battery module structure unstability.

For this, referring to fig. 5 to 7, the battery module of this embodiment further includes a first fixing member 4 and a second fixing member 5, the first fixing member 4 is horizontally disposed between the top surfaces of two adjacent electric core groups 31, the two ends of the first fixing member 4 in the length direction are respectively and fixedly connected to the top surfaces of two end plates 1, the second fixing member 5 is horizontally disposed between the bottom surfaces of two adjacent electric core groups 31, and the two ends of the second fixing member 5 in the length direction are respectively and fixedly connected to the bottom surfaces of two end plates 1. According to the arrangement, on one hand, the first fixing piece 4 and the second fixing piece 5 are matched with each other to draw the two end plates 1, so that the stress strength of the end plates 1 can be improved, the clamping fixing force of the end plates 1 on the battery cell module 3 is improved, and the overall structural strength of the battery module is ensured; on the other hand, through the effect of first mounting 4 and second mounting 5, can restrict adjacent two electric core group 31 and take place relative displacement in battery module direction of height, improve battery module's structural stability. In this embodiment, the first fixture 4 and the second fixture 5 are preferably plate-shaped structures, and can be bonded to both end surfaces of the unit cell 310 in the height direction.

In order to ensure that the individual battery cells 310 in the battery module are aligned with each other, the embodiment is implemented by a method in which, specifically, a first connecting plate 41 inserted between two adjacent battery cell groups 31 is fixedly arranged in the middle of the first fixing member 4 along the length direction thereof, and the first connecting plate 41 is in contact with the side surface of the battery cell group 31; the middle part of the second fixing member 5 is fixedly provided with a second connecting plate 51 along the length direction thereof, which is inserted between two adjacent electric core groups 31, and the second connecting plate 51 is in contact with the side surface of the electric core group 31.

Adopt above-mentioned technical scheme, when carrying out monomer electricity core 310 and arranging for electric core group 31, can make the monomer electricity core 310 side draw close to first connecting plate 41 and second connecting plate 51 both sides face through first connecting plate 41 and second connecting plate 51 respectively on two electric core groups 31 as the benchmark, specifically speaking, each monomer electricity core 310 in the assurance electric core group 31 aligns each other in its thickness direction, realize that two adjacent electric core groups 310 align in the width direction of battery module. Meanwhile, the top ends and the bottom ends of the single battery cells 310 are referenced by the first fixing member 4 and the second fixing member 5, so that the single battery cells 310 in the battery pack 31 can be ensured to be aligned with each other in the height direction. Meanwhile, the two ends of the battery cell group 31 in the length direction are limited by the end plates 1, and then the arrangement of the single battery cells 310 in the battery module in the height direction and in the horizontal direction can be neat.

Preferably, the first fixture 4, the second fixture 5, the first connecting plate 41, and the second connecting plate 51 are connected to the cell 310 in an insulating manner. From this setting, can avoid taking place the electricity between above-mentioned part and the monomer electricity core 310 and be connected, lead to the short circuit, and specifically, first mounting 4, second mounting 5, first connecting plate 41 and second connecting plate 51 can be the non-conducting material, or above-mentioned part sets up to the metal material, but its surface is provided with the insulating layer, also can realize and be connected with monomer electricity core 310 is insulating.

Preferably, in this embodiment, a first insulating member 6 is disposed between the end plate 1 and the cell module 3, so as to avoid direct contact between the end plate 1 and the cell 310 and cause short circuit, a second insulating member 7 is disposed between two adjacent cell groups 31, and a third insulating member 8 is disposed between the large faces of the cell 310. Through the arrangement of the second insulating part 7 and the third insulating part 8, the electric isolation between the single battery cores 310 can be ensured, and the occurrence of short circuit is avoided.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An end plate for a battery module, characterized in that: the end plate (1) is provided with a first surface (11) and a second surface (12) which are oppositely arranged along the thickness direction of the end plate, the first surface (11) is used for being in surface contact with a single battery cell (310) in the battery module, the second surface (12) can be matched with the binding belt (2) for the battery module, and the whole second surface (12) is an arc-shaped surface relative to the first surface (11).

2. The end plate for a battery module according to claim 1, wherein: the second surface (12) protrudes from two ends of the length of the end plate (1) to one side far away from the first surface (11).

3. The end plate for a battery module according to claim 2, wherein: the second surface (12) of the end plate (1) is provided with reinforcing ribs (121) which are arranged along the length direction and the width direction of the end plate (1) in a crossed mode, and the surfaces, matched with the binding bands (2), of the reinforcing ribs (121) are integrally arc-shaped surfaces.

4. The end plate for a battery module according to claim 1, wherein: the two ends of the end plate (1) in the length direction are provided with arc angles (10) matched with the binding bands (2).

5. A battery module comprising at least one tie (2), a cell module (3) and two end plates (1) according to any one of claims 1 to 4, characterized in that: electric core module (3) include two row at least electric core group (31) that set up side by side, electric core group (31) include a plurality of range upon range of monomer electric core (310), two end plate (1) separates and centre gripping each other electric core module (3), end plate (1) with the big face of monomer electric core (310) contacts, at least one bandage (2) encircle electric core module (3) and two end plate (1) outside and with electric core module (3) and end plate (1) surface fit.

6. The battery module according to claim 5, wherein: still include first mounting (4) and second mounting (5), first mounting (4) level is located adjacent two between electric core group (31) top surface, first mounting (4) length direction both ends respectively with two end plate (1) top surface fixed connection, second mounting (5) level is located adjacent two between electric core group (31) bottom surface, second mounting (5) length direction both ends respectively with two end plate (1) bottom surface fixed connection.

7. The battery module according to claim 6, wherein: the middle part of the first fixing piece (4) is fixedly provided with a first connecting plate (41) inserted between two adjacent electric core groups (31) along the length direction of the first fixing piece, and the first connecting plate (41) is contacted with the side surface of the electric core group (31); the middle part of the second fixing part (5) is fixedly provided with a second connecting plate (51) inserted between two adjacent electric core groups (31) along the length direction of the second fixing part, and the second connecting plate (51) is contacted with the side surface of the electric core group (31).

8. The battery module according to claim 7, wherein: the first fixing piece (4), the second fixing piece (5), the first connecting plate (41) and the second connecting plate (51) are in insulation connection with the single battery cell (310).

9. The battery module according to claim 5, wherein: the battery core group is characterized in that a first insulating part (6) is arranged between the end plate (1) and the battery core module (3), a second insulating part (7) is arranged between the two adjacent battery core groups (31), and a third insulating part (8) is arranged between the large surfaces of the single battery cores (310).