CN210136973U

CN210136973U - Battery module

Info

Publication number: CN210136973U
Application number: CN201921457815.7U
Authority: CN
Inventors: 廖喜平; 张海东
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2019-09-03
Filing date: 2019-09-03
Publication date: 2020-03-10
Anticipated expiration: 2029-09-03

Abstract

The utility model provides a battery module, it includes a plurality of batteries, first end plate, second end plate, shell fragment and first baffle. The first end plate is provided with a mounting groove, and the elastic piece is fixedly arranged in the mounting groove. One end of the first partition plate is fixed on the second end plate, and the other end of the first partition plate is matched with the elastic piece in the mounting groove and is fixed on the first end plate. In the assembling process of the battery module, the other end of the first partition plate is firstly positioned and installed through the cooperation between the other end of the first partition plate and the elastic sheet, and after the other end of the first partition plate is installed in place, the other end of the first partition plate is fixedly connected with the first end plate through a welding mode. In the welding process of the battery module and the elastic sheet, due to the arrangement of the elastic sheet, most parts or even all parts of the welding beam are blocked at one side of the batteries by the elastic sheet, so that the influence of the welding beam on the insulating films on the surfaces of the batteries is reduced, and the safety use performance of the battery module is ensured.

Description

Battery module

Technical Field

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

Background

The dual-bank battery module generally includes a plurality of batteries, a first end plate, a second end plate, and a first separator plate, and the first separator plate clamps and fixes the plurality of batteries together with the first end plate and the second end plate. In order to ensure insulation between two adjacent batteries, the surface of each battery is generally provided with an insulating film.

At present, in order to realize the fixed connection between first baffle and first end plate, the second end plate, first end plate and second end plate all are provided with the mounting groove, and the mounting groove of first baffle and first end plate, second end plate adopts butt seam welding, and because first baffle is clearance fit with each mounting groove, then the light leak easily appears when laser welding and leads to the insulating film on battery surface to be burnt, has greatly reduced battery module's safety performance from this.

SUMMERY OF THE UTILITY MODEL

In view of the problem that exists among the background art, the utility model aims to provide a battery module, its in group process at battery module has avoided welding light leak problem, has guaranteed battery module's safety in performance from this.

In order to achieve the above object, the utility model provides a battery module, it includes: the battery comprises a plurality of batteries, a first end plate, a second end plate, a spring piece and a first partition plate. First end plate and second end plate are located respectively in the second direction a plurality of battery both sides, and first end plate is provided with the mounting groove, the mounting groove link up first end plate along the second direction. The elastic sheet is fixedly arranged in the mounting groove of the first end plate. The first baffle extends along the second direction, and the one end of first baffle is fixed in the second end plate, and the other end of first baffle cooperates and is fixed in first end plate with the shell fragment in the mounting groove of first end plate. The plurality of batteries are respectively disposed at both sides of the first separator in the first direction.

The mounting groove comprises a first mounting section and a second mounting section, and the second mounting section is located on one side, close to the battery, of the first mounting section in the second direction. The first partition plate is provided with a body part and an insertion part, the body part is positioned between the first end plate and the second end plate, the insertion part is accommodated in the mounting groove, the front part of the insertion part is connected with the first mounting section, and the rear part of the insertion part is matched with the elastic sheet in the second mounting section.

The second mounting section has a first stop surface and a second stop surface, the second stop surface being spaced from the first stop surface in a second direction. The elastic sheet is accommodated between the first stop surface and the second stop surface and is fixed on the second mounting section.

The elastic sheet comprises a first main body part, a second main body part and a connecting part. The first main body part and the second main body part are arranged at intervals in the first direction and extend along the third direction, the connecting part is located at two ends of the first main body part and the second main body part in the third direction, and the connecting part is connected to the first main body part and the second main body part. The insertion portion of the first separator is located between the first main body portion and the second main body portion in the first direction.

The elastic sheet further comprises a first clamping part and a second clamping part. The first clamping portion and the second clamping portion are arranged at intervals in the first direction and are located on one sides, far away from the battery, of the first main body portion and the second main body portion in the second direction, the first clamping portion is connected to the first main body portion and extends obliquely towards the second main body portion, and the second clamping portion is connected to the second main body portion and extends obliquely towards the first main body portion. The first clamping portion and the second clamping portion clamp the insertion portion of the first partition plate in the mounting groove of the first end plate.

The included angle formed by the first clamping part and the first main body part is α₁The included angle formed by the second clamping part and the second main body part is α₂And α₁≥α₂。

The first clamping part extends obliquely for a length L₁The second clamping part extends obliquely for a length L₂And L is₁≤L₂。

The first partition plate is also provided with a first limiting groove and a second limiting groove, and the first limiting groove and the second limiting groove are arranged at the rear part of the insertion part. The end part of the first clamping part is stopped in the first limiting groove, and the end part of the second clamping part is stopped in the second limiting groove.

At least part of the first limiting groove is positioned on one side of the second limiting groove in the second direction.

Each connecting portion includes a first connecting section, a second connecting section and a stopper section. The first connecting section and the second connecting section are arranged at intervals in the first direction, and the first connecting section is connected to the first main body part and the second connecting section is connected to the second main body part. The stopping section extends along the first direction and connects the first connecting section and the second connecting section.

The utility model has the advantages as follows:

in the assembly process of the battery module, the other end of the first partition plate is firstly installed at the other end of the first partition plate in a positioning mode through the cooperation between the other end of the first partition plate and the elastic sheet, and when the other end of the first partition plate is installed in place, the other end of the first partition plate is fixedly connected with the first end plate through a welding mode. In the welding process of the battery module and the elastic sheet, due to the arrangement of the elastic sheet, most parts or even all parts of the welding beam are blocked at one side of the batteries by the elastic sheet, so that the influence of the welding beam on the insulating films on the surfaces of the batteries is reduced, and the safety use performance of the battery module is ensured.

Drawings

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

Fig. 2 is an assembled view of fig. 1.

Fig. 3 is a perspective view of the battery module of fig. 2 with the battery removed, and the second separator omitted.

Fig. 4 is a perspective view of the battery module before the first separator, the spring plate, and the first end plate are assembled.

Fig. 5 is a schematic view of a connection relationship between the elastic sheet and the first end plate.

Fig. 6 is a schematic view of the connection relationship between the elastic sheet and the first end plate and the first partition plate.

Fig. 7 is a structural view of the mounting groove of the first end plate.

Fig. 8 is a perspective view of the spring plate.

Fig. 9 is an enlarged view of a circled portion in fig. 8.

Wherein the reference numerals are as follows:

1 first clamping part of battery 44

2 first end plate 45 second clamping part

21 mounting groove 5 first partition

211 first mounting section 51 body portion

212 second mounting section 52 insert

212A front of the first stop surface 52A

212B second stop surface 52B

3 first limiting groove of second end plate 53

4 second limiting groove of elastic sheet 54

41 first body part 6 second separator

42 second body 7 side plate

43 connection part X first direction

431 first connection Y second direction

432 second connection segment Z third direction

433 stop section

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In the description of the present application, unless explicitly stated or limited otherwise, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means more than two (including two); the term "coupled", unless otherwise specified or indicated, is to be construed broadly, e.g., "coupled" may be a fixed or removable connection or a connection that is either integral or electrical or signal; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the description of the present application, it should be understood that the terms "upper" and "lower" used in the description of the embodiments of the present application are used in a descriptive sense only and not for purposes of limitation. The present application is described in further detail below with reference to specific embodiments and with reference to the attached drawings.

Referring to fig. 1 and 2, the battery module of the present application may include a plurality of batteries 1, a first end plate 2, a second end plate 3, an elastic sheet 4, a first separator 5, and a side plate 7. The battery module may further include a second separator 6 according to practical circumstances.

The plurality of cells 1 may be arranged in a plurality of cell rows, and the plurality of cells 1 in each cell row are arranged side by side in the second direction Y. Wherein one first separator 5 may be disposed between two battery rows adjacent in the first direction X, and one second separator 6 may be disposed between two battery rows adjacent in the second direction Y. In addition, in order to ensure insulation between two adjacent batteries 1, the surface of each battery 1 is provided with an insulating film.

The first end plate 2 and the second end plate 3 are respectively located on two sides of the plurality of battery rows in the second direction Y, and the first end plate 2 and the second end plate 3 are fixedly connected with the first partition plate 5 arranged between the two.

The first partition 5 extends in the second direction Y and the second partition 6 extends in the first direction X. The number of the second separators 6 may be two, and the two second separators 6 are respectively located at both sides of the first separator 5 in the first direction X and form a cross-shaped structure together with the first separator 5, thereby greatly improving the structural strength of the battery module.

The number of the side plates 7 may be two, and the two side plates 7 are respectively located at both sides of the plurality of battery cells 1 in the first direction X. Wherein, the two side plates 7 can be fixedly connected to the first end plate 2 and the second end plate 3 by welding, so that the two side plates 7, the first end plate 2 and the second end plate 3, together with the first separator 5 and the two second separators 6, clamp and fix the plurality of batteries 1.

It should be noted that the present application may also select a band to be disposed around the first end plate 2, the second end plate 3 and the plurality of batteries 1 and to tightly bind the first end plate 2, the second end plate 3 and the plurality of batteries 1, instead of the two side plates 7.

Referring to fig. 4 to 7, the first end plate 2 is provided with a mounting groove 21, and the mounting groove 21 penetrates through the first end plate 2 along the second direction Y and fixedly mounts the elastic piece 4. One end of the first partition plate 5 is fixed on the second end plate 3, and the other end of the first partition plate 5 is matched with the elastic sheet 4 in the mounting groove 21 of the first end plate 2 and is fixed on the first end plate 2.

In the assembly process of the battery module of this application, first baffle 5 the other end at first through with the shell fragment 4 between the mating reaction realize to first baffle 5 the location installation of the other end, when first baffle 5 the other end is installed the back in place, first baffle 5 the other end is again through welding mode and first end plate 2 fixed connection. In the welding process of the elastic sheets 4, most parts or even all parts of the welding beams are blocked by the elastic sheets 4 at one side of the batteries 1, so that the influence of the welding beams on the insulating films on the surfaces of the batteries 1 is reduced, and the safety use performance of the battery module is ensured.

Referring to fig. 5 to 7, the mounting groove 21 of the first end plate 2 may include a first mounting section 211 and a second mounting section 212. The second mounting section 212 is located on one side of the first mounting section 211 close to the battery 1 in the second direction Y, and the second mounting section 212 is communicated with the first mounting section 211. The second mounting section 212 of the mounting groove 21 is fixedly mounted with the elastic sheet 4, and the first mounting section 211 is fixedly connected with the first partition 5 by welding.

Referring to fig. 4 and 6, the first separator 5 may have a body portion 51 and an insertion portion 52. The body portion 51 is positioned between the first end plate 2 and the second end plate 3, and the insertion portion 52 is received in the mounting groove 21. Wherein the front portion 52A of the insertion portion 52 is welded to the first mounting section 211, and the rear portion 52B of the insertion portion 52 is fitted with the resilient piece 4 in the second mounting section 212.

Specifically, referring to fig. 5 to 7, the second mounting section 212 may have a first stop surface 212A and a second stop surface 212B, the second stop surface 212B being spaced apart from the first stop surface 212A in the second direction Y. When the spring plate 4 is inserted into the second mounting section 212, the spring plate 4 is accommodated between the first stopping surface 212A and the second stopping surface 212B, and the spring plate 4 simultaneously presses the first stopping surface 212A and the second stopping surface 212B outwards based on its own elasticity, so that the spring plate 4 is firmly fixed in the second mounting section 212.

Referring to fig. 5, 6, 8 and 9, the resilient tab 4 is fixedly disposed in the second mounting section 212 of the mounting groove 21, and the resilient tab 4 may include a first main body portion 41, a second main body portion 42 and two connecting portions 43. Depending on the actual situation, the resilient plate 4 may further include a first clamping portion 44 and a second clamping portion 45.

The first and

second body portions

41 and 42 extend in the third direction Z, and the first and

second body portions

41 and 42 are provided at intervals in the first direction X to insert the insertion portion 52 of the first partition 5. Preferably, the first main body portion 41 extends obliquely toward the second main body portion 42, and the second main body portion 42 extends obliquely toward the first main body portion 41, that is, the projection shape of the first main body portion 41 and the second main body portion 42 in the third direction Z is a "eight" shape.

The two connecting portions 43 are located at both ends of the first body portion 41 and the second body portion 42 in the third direction Z, and each connecting portion 43 is connected to the first body portion 41 and the second body portion 42. When the resilient plate 4 is inserted into the second mounting section 212 of the mounting groove 21, the two connecting portions 43 are stopped between the first and second stop surfaces 212A and 212B, thereby fixing the entire resilient plate 4 in the mounting groove 21. When the other end of the first partition plate 5 is mounted in place in the mounting groove 21, the insertion portion 52 of the first partition plate 5 is defined between the two connection portions 43 in the third direction Z and between the first and

second body portions

41 and 42 in the first direction X.

Specifically, referring to fig. 5 and 9, each connection portion 43 may include a first connection section 431, a second connection section 432, and a stopper section 433. The first connection section 431 and the second connection section 432 are provided at intervals in the first direction X, and the first connection section 431 is connected to the first body portion 41 and the second connection section 432 is connected to the second body portion 42. The stopping section 433 extends in the first direction X and connects the first connecting section 431 and the second connecting section 432.

In order to ensure the structural strength of the connection portion 43, the extending direction of the first connection section 431 coincides with the extending direction of the first body portion 41, and the extending direction of the second connection section 432 coincides with the extending direction of the second body portion 42. Preferably, the first connection section 431 may extend obliquely toward the second connection section 432, and the second connection section 432 extends obliquely toward the first connection section 431.

Referring to fig. 5, 6 and 9, the first and

second clamping portions

44 and 45 are provided at intervals in the first direction X and on a side of the first and second

main body portions

41 and 42 away from the battery 1 in the second direction Y. The first clip portion 44 is connected to the first body portion 41 and extends obliquely toward the second body portion 42, and the second clip portion 45 is connected to the second body portion 42 and extends obliquely toward the first body portion 41. When the other end of the first partition 5 is fitted in place in the fitting groove 21, the first clamping portion 44 and the second clamping portion 45 together clamp the rear portion 52B of the insertion portion 52 of the first partition 5.

Since the front portion 52A of the insertion portion 52 of the first partition 5 is directly welded to the first mounting section 211 while the rear portion 52B of the insertion portion 52 is clamped and fixed by the first clamping portion 44 and the second clamping portion 45 of the resilient tab 4, the connection reliability between the first partition 5 and the first end plate 2 is greatly improved. And, based on the structure that the first clamping part 44 and the second clamping part 45 extend obliquely, the inclined surfaces of the first clamping part 44 and the second clamping part 45 can stop the welding beam to the maximum extent, thereby avoiding the influence of the welding beam on the insulating films on the surfaces of the plurality of batteries 1, and thus improving the safety use performance of the battery module.

Referring to fig. 5, the first clamping portion 44 and the first main body portion 41 form an included angle α₁The included angle formed by the second clamping portion 45 and the second main body portion 42 is α₂And α₁≥α₂。

Referring to FIG. 5, the first clampingThe portion 44 extends obliquely over a length L₁The second clamping portion 45 extends obliquely for a length L₂And L is₁≤L₂。

It should be noted that when α₁＝α₂，L₁＝L₂At this time, the acting forces of the first clamping portion 44 and the second clamping portion 45 on the first partition board 5 are substantially the same (i.e. the deformation of the first clamping portion 44 is substantially the same as the deformation of the second clamping portion 45), and at this time, both sides of the first partition board 5 in the first direction X can be welded in the mounting groove 21 of the first end plate 2 simultaneously.

When α₁＞α₂，L₁＜L₂During the process, the acting force of the second clamping portion 45 on the first partition board 5 is greater than the acting force of the first clamping portion 44 on the first partition board 5 (namely, the deformation of the first clamping portion 44 is greater than the deformation of the second clamping portion 45), so that the first partition board 5 approaches to one side of the mounting groove 21 close to the first clamping portion 44, at the moment, the side of the mounting groove 21 close to the first clamping portion 44 is a welding side, and the first partition board 5 is tightly attached to the welding side under the action of the second clamping portion 45, thereby improving the welding quality between the welding side and the first partition board 5.

Referring to fig. 6, the first partition 5 may further have a first stopper groove 53 and a second stopper groove 54, the first stopper groove 53 and the second stopper groove 54 being provided at the rear portion 52B of the insertion portion 52. When the first partition board 5 is installed on the first end board 2, the first partition board 5 is gradually inserted into the installation groove 21 of the first end board 2 along the second direction Y until the end of the first clamping portion 44 stops in the first limiting groove 53 and the end of the second clamping portion 45 stops in the second limiting groove 54, which indicates that the first partition board 5 is installed in place, so that the stopping effect of the first clamping portion 44 and the second clamping portion 45 on the welding light beams is strengthened and the installation efficiency is also improved.

In order to alleviate the influence of the arrangement of the first and second limiting

recesses

53 and 54 on the strength of the first partition board 5, referring to fig. 6, at least a portion of the first limiting recess 53 is located on one side of the second limiting recess 54 in the second direction Y. In other words, the first limiting recess 53 and the second limiting recess 54 are disposed in a staggered manner in the second direction Y.

Claims

1. A battery module is characterized by comprising a plurality of batteries (1), a first end plate (2), a second end plate (3), an elastic sheet (4) and a first partition plate (5);

the first end plate (2) and the second end plate (3) are respectively positioned at two sides of the plurality of batteries (1) in the second direction (Y), the first end plate (2) is provided with a mounting groove (21), and the mounting groove (21) penetrates through the first end plate (2) along the second direction (Y);

the elastic sheet (4) is fixedly arranged in the mounting groove (21) of the first end plate (2);

the first partition plate (5) extends along the second direction (Y), one end of the first partition plate (5) is fixed to the second end plate (3), and the other end of the first partition plate (5) is matched with the elastic sheet (4) in the installation groove (21) of the first end plate (2) and is fixed to the first end plate (2);

the plurality of batteries (1) are respectively arranged on two sides of the first separator (5) in the first direction (X).

2. The battery module according to claim 1,

the mounting groove (21) comprises a first mounting section (211) and a second mounting section (212), and the second mounting section (212) is positioned on one side, close to the battery (1), of the first mounting section (211) in the second direction (Y);

the first partition plate (5) is provided with a body part (51) and an insertion part (52), the body part (51) is located between the first end plate (2) and the second end plate (3), the insertion part (52) is contained in the mounting groove (21), the front part (52A) of the insertion part (52) is connected to the first mounting section (211), and the rear part (52B) of the insertion part (52) is matched with the elastic sheet (4) in the second mounting section (212).

3. The battery module according to claim 2,

the second mounting section (212) has a first stop surface (212A) and a second stop surface (212B), the second stop surface (212B) being spaced apart from the first stop surface (212A) in the second direction (Y);

the spring plate (4) is received between the first stop surface (212A) and the second stop surface (212B) and is fixed to the second mounting section (212).

4. The battery module according to claim 2,

the elastic sheet (4) comprises a first main body part (41), a second main body part (42) and a connecting part (43);

the first main body part (41) and the second main body part (42) are arranged at intervals in the first direction (X) and extend along the third direction (Z), the connecting part (43) is positioned at the end part of the first main body part (41) and the second main body part (42) in the third direction (Z), and the connecting part (43) is connected to the first main body part (41) and the second main body part (42);

the insertion portion (52) of the first partition (5) is located between the first main body portion (41) and the second main body portion (42) in the first direction (X).

5. The battery module according to claim 4,

the elastic sheet (4) further comprises a first clamping part (44) and a second clamping part (45);

the first clamping part (44) and the second clamping part (45) are arranged at intervals in the first direction (X) and are positioned on one sides, far away from the battery (1), of the first main body part (41) and the second main body part (42) in the second direction (Y), the first clamping part (44) is connected to the first main body part (41) and extends obliquely towards the second main body part (42), and the second clamping part (45) is connected to the second main body part (42) and extends obliquely towards the first main body part (41);

the first clamping portion (44) and the second clamping portion (45) clamp the insertion portion (52) of the first partition plate (5) in the mounting groove (21) of the first end plate (2).

6. The battery module according to claim 5, wherein the first clamping portion (44) forms an included angle of α with the first main body portion (41)₁The included angle formed by the second clamping part (45) and the second main body part (42) is α₂And α₁≥α₂。

7. The battery module according to claim 5, wherein the first clamping part (44) extends obliquely over a length L₁The second clamping part (45) extends obliquely for a length L₂And L is₁≤L₂。

8. The battery module according to claim 5,

the first partition plate (5) is also provided with a first limiting groove (53) and a second limiting groove (54), and the first limiting groove (53) and the second limiting groove (54) are arranged at the rear part (52B) of the insertion part (52);

the end of the first clamping part (44) is stopped in the first limit groove (53), and the end of the second clamping part (45) is stopped in the second limit groove (54).

9. The battery module according to claim 8, wherein at least a portion of the first stopper groove (53) is located at one side of the second stopper groove (54) in the second direction (Y).

10. The battery module according to claim 4,

each connecting portion (43) comprises a first connecting section (431), a second connecting section (432) and a stopping section (433);

the first connecting section (431) and the second connecting section (432) are arranged at intervals in the first direction (X), the first connecting section (431) is connected to the first main body part (41), and the second connecting section (432) is connected to the second main body part (42);

the stop section (433) extends in the first direction (X) and connects the first connection section (431) and the second connection section (432).