CN217788616U

CN217788616U - Shell of battery module and battery module

Info

Publication number: CN217788616U
Application number: CN202222013890.2U
Authority: CN
Inventors: 赵冬; 沈玉阳
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2022-08-01
Filing date: 2022-08-01
Publication date: 2022-11-11
Anticipated expiration: 2032-08-01

Abstract

The application provides a casing and battery module of battery module, this casing includes: a side plate and an end plate; the end part of the side plate is provided with a bending structure buckled on the end plate; the end plate is provided with a notch matched with the bending structure; the bending structure is provided with at least one clamping structure extending towards the inner direction of the shell; the side wall of the notch is provided with a clamping groove which is clamped and matched with each clamping structure; the bending structure is connected with the end plate in a welding mode. In above-mentioned technical scheme, through adopting to set up the joint structure on bending structure, the joint structure is connected and welded connection acts on together with the block of draw-in groove, has strengthened the joint strength between end plate and the curb plate, improves the intensity of the casing of battery module, and then has improved the stability of battery module.

Description

Shell of battery module and battery module

Technical Field

The application relates to the technical field of batteries, in particular to a shell of a battery module and the battery module.

Background

The battery module needs to bear certain battery expansion force usually, and along with module size development toward big module in the trade, single module capacity promotes constantly, and the expansion force that the module needs to bear is increasing more and more, consequently more and more high to the welding seam intensity requirement of end plate and curb plate.

Under certain conditions, because the welding performance of the welded material is poor, the inside of the welding seam has the defects of cracks, air holes and the like, so that the strength of the welding seam is reduced, and the welding seam of the module cannot meet the requirement of resisting the expansion force of the battery.

SUMMERY OF THE UTILITY MODEL

The application provides a casing and battery module of battery module for improve battery module's stability.

In a first aspect, the present application provides a case for a battery module, the case including: side plates and end plates; the end part of the side plate is provided with a bending structure buckled on the end plate; the end plate is provided with a notch matched with the bending structure; the bending structure is provided with at least one clamping structure extending towards the inner direction of the shell; the side wall of the notch is provided with a clamping groove which is matched with each clamping structure in a clamping way; and the bending structure is connected with the end plate in a welding manner.

In above-mentioned technical scheme, through adopting to set up the joint structure on bending structure, the joint structure is connected and welded connection acts on together with the block of draw-in groove, has strengthened the joint strength between end plate and the curb plate, improves the intensity of battery module's casing, and then has improved battery module's stability.

In a second aspect, a battery module is provided, which comprises a housing of any one of the above battery modules and a plurality of batteries disposed in the housing.

Drawings

Fig. 1 is a schematic structural diagram of a housing of a battery module according to an embodiment of the present disclosure;

fig. 2 is a top view of a housing of a battery module according to an embodiment of the present disclosure;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a schematic structural diagram of an end plate provided in an embodiment of the present application;

fig. 5 is a top view of another housing of a battery module according to an embodiment of the present application;

FIG. 6 is a partial enlarged view of FIG. 5 at B;

fig. 7 is a schematic structural view illustrating another housing of a battery module according to an embodiment of the present disclosure;

fig. 8 is a top view of another housing of a battery module according to an embodiment of the present application;

FIG. 9 is an enlarged view of a portion of FIG. 8 at C;

FIG. 10 is a schematic structural diagram of an end plate provided in an embodiment of the present application;

fig. 11 is a schematic structural view of a battery module according to an embodiment of the present disclosure.

Detailed Description

The present application is described in further detail below with reference to the figures and examples. The features and advantages of the present application will become more apparent from the description.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

In addition, the technical features related to the different embodiments of the present application described below may be combined with each other as long as they do not conflict with each other.

To facilitate understanding of the housing of the battery module provided in the embodiments of the present application, an application scenario of the battery module is first introduced. The shell of the battery module that this application embodiment provided is used for bearing the battery to constitute battery module together with the battery. The casing of current battery module adopts curb plate and end plate to be connected and encloses into frame type structure and hold the battery. But the curb plate of current battery module's casing is not big with the end plate joint strength in the junction, and at battery during operation, very easily destroy the splice of curb plate and end plate after the thermal expansion, cause the battery module to damage. Therefore, the embodiment of the application provides a housing of a battery module, which is used for improving the capacity of bearing the expansion of a battery. The following detailed description is made with reference to the specific drawings and examples.

Referring to fig. 1 and 2, fig. 1 illustrates a structure of a case of a battery module according to an embodiment of the present disclosure. Fig. 2 shows a top view of a housing of a battery module provided in an embodiment of the present application. The battery module case provided by the embodiment of the present application includes side plates 10 and end plates 20. The number of the side plates 10 is two, and the number of the end plates 20 is two. When the shell is formed, the two side plates 10 are opposite to each other, the two end plates 20 are opposite to each other, and the two ends of the side plates 10 are respectively in one-to-one corresponding welding connection with the two end plates 20, so that a rectangular accommodating cavity is formed in an enclosing mode, and batteries are borne.

Besides the side plates 10 and the end plates 20, the battery case further includes a bottom plate for supporting the end plates 20 and the side plates 10, and fixedly connected to the end plates 20 and the side plates 10, respectively, for supporting the battery.

For convenience of description, a coordinate system is constructed in which an origin O is a bottom angle of the housing, an X direction is parallel to a width direction of the housing, a Y direction is parallel to the width direction of the housing, and a Z direction is parallel to a height direction of the housing.

A thickness direction of the lower end plate 20 is defined, and the thickness direction of the end plate 20 refers to a dimension of the end plate 20 in the X direction.

Defining the longitudinal direction of a lower side plate 10 and the longitudinal direction of an end plate 20. Wherein, the length direction of the side plate 10 is along the direction in which the two end plates 20 are arranged, that is, along the X direction; the end plate 20 has a length direction along the arrangement direction of the two side plates 10, i.e., along the Y direction. When the side plate 10 is connected to the end plate 20, two ends of the side plate 10 along the length direction thereof are respectively welded to the two end plates 20, and similarly, two ends of the end plate 20 along the length direction thereof are respectively welded to the two side plates 10.

Referring to fig. 3 together, fig. 3 shows a partially enlarged view at a of fig. 2 in order to improve the structural strength of the case of the battery module. When the side plate 10 is installed, the end of the side plate 10 has a bent structure 11 that is engaged with the end plate 20. Wherein, the end of the side plate 10 is referred to as the end of the side plate 10 along the length direction thereof. The bending structure 11 is an L-shaped bending structure 11, and the bending direction thereof is bent toward the end plate 20. When both ends of the side plate 10 are connected to the end plates 20, respectively, the bent structures 11 are provided at both ends of the side plate 10, respectively, so that the side plate 10 is integrally formed in a U-shaped structure. When the side panel 10 is fastened to the end panel 20, the bent structure 11 of the side panel 10 overlaps the end panel 20.

In the embodiment of the present application, the bending structure 11 is an integral structure with the side plate 10. In the preparation process, the side plates 10 can be bent by a bending machine, and the bending structures 11 can also be formed by punching of a punching machine.

Referring also to fig. 4, fig. 4 shows a schematic structural view of the end plate 20, and when the end plate 20 is engaged with the bending structure 11, the end plate 20 is provided with a notch 21 engaged with the bending structure 11. The notch 21 is located at the end of the end plate 20 (the end of the end plate 20 along its length) to form a stepped configuration at the end of the end plate 20. The end plate 20 has notches 21 formed at both ends thereof, and has a convex structure in a plan view. That is, two opposite notches 21 are formed on the outer side wall of the end plate 20 facing away from the cavity, and each notch 21 has two adjacent side walls, namely a first side wall 211 and a second side wall 212. The first sidewall 211 of the notch 21 is overlapped with the bending structure 11, and the second sidewall 212 of the notch 21 is opposite to the bending structure 11. The bending structure 11 is an end face of the bending structure 11 far from one end of the side plate 10.

When the side plate 10 is connected to the end plate 20, the bending structure 11 is located in the notch 21, one surface of the bending structure 11 contacts with the first side wall 211 of the notch 21, and the end surface of the bending structure 11 contacts with or is spaced from the second side wall 212 of the notch 21 by a gap.

When the side plate 10 and the end plate 20 are connected, the side plate 10 and the end plate 20 are welded, that is, the bent structure 11 is welded to the end plate 20. Illustratively, when welding, the portion of the bending structure 11 that is engaged with the end plate 20 is welded to the end plate 20. Thereby enhancing the structural strength of the welding line, improving the welding effect, and further improving the connection effect of the side plate 10 and the end plate 20.

Refer to fig. 3 and 4 together. To improve the structural strength of the housing. The bending structure 11 is provided with at least one clamping structure 12 extending towards the inner direction of the shell; the side wall of the notch 21 is provided with a clamping groove 22 which is matched with each clamping structure 12 in a clamping way. It can be seen from the above description that, when curb plate 10 is connected with end plate 20, on the one hand through the welded connection of bending structure 11 with end plate 20, on the other hand still is connected with end plate 20 block through joint structure 12, thereby realize being connected between end plate 20 and the curb plate 10 through the connected mode of two kinds of differences, compare the casing among the prior art, a connected mode has been increased, and then the joint strength between curb plate 10 and the end plate 20 has been strengthened, stability when having improved the casing and bearing the battery bulging force, and then the stability of battery module has been improved.

In the embodiment of the present application, the clamping structure 12 is a strip-shaped structure, and the length direction of the clamping structure 12 is along the Z direction, that is, the clamping structure 12 is a vertically arranged strip-shaped structure. It should be understood that the end face of the snap structure 12 is illustrated as being rectangular in fig. 3, but the shape of the snap structure 12 is not limited in the embodiment of the present application, and the end face shape may also be triangular, trapezoidal, or other shapes.

The shape of the catch 22 matches the shape of the catch formation 12 when arranged. When the clamping structure 12 is a long strip structure, the corresponding clamping groove 22 is also a long strip. Meanwhile, when the end surface of the clamping structure 12 has different shapes, the end surface of the clamping groove 22 can also have a matching shape.

In a specific arrangement, the number of the clamping structures 12 can be one or more. These will be described below.

With continued reference to fig. 3 and 4, the number of the clamping structures 12 is one, and the clamping structures 12 and the bending structures 11 are of an integral structure. Specifically, the clamping structure 12 is formed by bending the bending structure 11 towards the inner cavity of the shell to form the clamping structure 12.

When the card slot 22 is provided in the notch 21, the card slot 22 is provided on the first side wall 211 of the notch 21, and the depth direction of the card slot 22 is along the X direction. The connection may be made in different ways when the snap structure 12 is located in the snap groove 22. Illustratively, the snap structure 12 may snap into the snap slot 22. When the above structure is adopted, the connection between the clamping structure 12 and the end plate 20 is facilitated. The interference fit connection may be achieved, for example, by a tolerance fit between the dimensions of the slot (slot 22) in the end plate 20 and the thickness dimension (dimension in the Y direction) of the clamping structure 12. The connection by interference fit requires high tolerance dimensions, and for elongated clamping structures 12, high precision machining of the thickness of the clamping structure 12 is easier to achieve than high precision machining of other dimensions.

In another mode, the clamping structure 12 may be welded to the side wall of the clamping groove 22 in addition to the above-mentioned clamping. That is, after the clamping structure 12 is assembled in the clamping groove 22, the clamping structure 12 is fixedly connected with the end plate 20 by welding. The clamping structure 12 is fused with the end plate 20 into a whole during welding. Or the latch structure 12 portion and the end plate 20 may be fused together. The connection strength between the side plate 10 and the end plate 20 is further enhanced by the way of clamping and welding. After welding, the welded seam formed by welding the side plate 10, the latch structure 12, and the end plate 20 covers the latch structure 12. I.e. the weld covers both the end plate 20, the side plate 10 and the clamping structure 12. The strength and the reliability of the welding line are improved.

Referring to fig. 5 and 6 together, fig. 5 shows a top view of another housing, and fig. 6 shows a partial enlarged view at B in fig. 5. The case shown in fig. 5 is different from the case shown in fig. 2 only in the side plate 10, and the structure of the end plate 20 can refer to the structure shown in fig. 4. The number of the clamping structures 30 is one, and the clamping structures 30 and the bending structures 11 are of split structures; and the clamping structure 30 is welded with the split structure. Specifically, the clamping structure 30 is a plate-shaped structure and is located between the bending structure 11 and the side wall of the notch 21.

During assembly, the end face of the bent structure 11 faces the second side wall 212 of the notch 21 opposite to the bent structure 11. The end face of the bending structure 11 refers to an end face of one end of the bending structure 11 away from the side plate 10. The clamping structure 30 is located between the bending structure 11 and the second side wall 212 of the notch 21. That is, the locking structure 30 is located between the end surface of the bending structure 11 and the side wall of the notch 21.

For convenience of description, the clamping structure 30 is matched with the bending structure 11 and the second side wall 212 of the notch 21. The thickness direction, the width direction and the length direction of a lower clamping structure 30 are defined, the thickness direction of the clamping structure 30 is along the Y direction, the width direction is along the X direction, and the length direction is along the Z direction. That is, the clamping structure 30 is a plate vertically placed and inserted between the bending structure 11 and the second side wall 212 of the notch 21.

When the card slot 22 is disposed, the card slot 22 is disposed on the first sidewall 211, and the width (along the Y direction) of the card slot 22 is between 0.1mm and 5mm, for example, the width of the card slot 22 is different sizes such as 0.1mm, 0.5mm, 1mm, 2mm, 3mm, 4mm, 4.5mm, and 5 mm. The distance from the bottom surface of the clamping groove 22 to the surface of the end plate 20 facing away from the cavity is between 1 and 10mm. Illustratively, the distance may be of various sizes, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, and so forth.

Correspondingly, the thickness of the clamping structure 30 is smaller than the width of the middle clamping structure 30. Illustratively, the thickness of the snap structure 30 is between 0.1mm and 5mm, such as the thickness of the snap structure 30 is 0.1mm, 0.5mm, 1mm, 2mm, 3mm, 4mm, 4.5mm, 5mm, etc. with different dimensions. The width of the clamping structure 30 is between 1 and 10mm. Illustratively, the width of the snap structure 30 may be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc. in various sizes.

The clamping structure 30 has two opposite surfaces in the thickness direction, which are referred to as two surfaces perpendicular to the Y direction. When mated, one of the two surfaces faces the end face of the flexure 11 and the other surface faces the side wall (second side wall 212) of the notch 21. That is, one surface of the clamping structure 30 in the thickness direction is attached to the end surface of the bending structure 11, and the other surface is attached to the second side wall 212 of the notch 21.

When the snap structure 30 is positioned within the snap slot 22, the snap structure 30 may snap into the snap slot 22. When the above structure is adopted, the pre-connection between the clamping structure 30 and the end plate 20 is facilitated. The interference fit connection can be achieved, for example, by a tolerance fit between the dimensions of the slot (slot 22) in the end plate 20 and the thickness of the clamping structure 30. When the connection is performed by interference fit, the requirement for tolerance dimension is high, and for the slender clamping structure 30, the high-precision processing on the thickness of the clamping structure 30 is easier to realize than the high-precision processing on other dimensions. The latch structure 30 is then welded to the side walls of the latch slot 22. That is, after the clamping structure 30 is assembled in the clamping groove 22, the clamping structure 30 is fixedly welded to the end plate 20 by welding, so as to connect the clamping structure 30.

When the clamping structure 30, the side plate 10 and the end plate 20 are welded together, the clamping structure 30 is fused and connected with the side plate 10 and the end plate 20 together during welding. Or the clamping structure 30 is partially fused with the side plate 10 and the end plate 20.

After welding, the side plate 10, the latch structure 30, and the end plate 20 are welded to form a weld that covers the latch structure 30. I.e. the weld covers the end plate 20, the side plate 10 and the clamping structure 30 simultaneously. Thereby through the effect of joint structure 30, can improve the weldability between the different kinds of metals, promote welding seam intensity and reliability.

When the clamping structure 30 and the bending structure 11 are separate structures, the clamping structure 30 may be an aluminum plate, an aluminum alloy plate, a nickel alloy plate, a copper alloy plate, or other alloy plates containing special elements.

Referring to fig. 7, 8 and 9 together, fig. 8 shows a structure of another housing provided in an embodiment of the present application, fig. 8 shows a top view of the housing structure shown in fig. 7, and fig. 9 is a partial enlarged view at C in fig. 8.

The housing illustrated in fig. 8 and 9 is a modified structure based on the housing shown in fig. 2 and 3. The matching of the bending structures 110 of the side plates 100 and the notches 210 of the end plates 200 illustrated in fig. 8 and 9 can refer to the description of the matching of the bending structures 11 and the notches 21 illustrated in fig. 3 and 4, and the description thereof is omitted here.

In the housing shown in fig. 8 and 9, the number of the clamping structures 120 may be multiple, and the plurality of clamping structures 120 are arranged at intervals.

Specifically, the plurality of clamping structures 120 are located on one surface of the bending structure 110 facing the inner cavity of the housing, and the plurality of clamping structures 120 are arranged at intervals along the length direction of the end plate 200. Illustratively, the plurality of clamping structures 120 are disposed on a surface of the bending structure 110 that abuts the first sidewall of the notch. The plurality of clamping structures 120 are arranged along the Y direction, a gap is formed between adjacent clamping structures 120, and the plurality of clamping structures 120 and the bending structure 110 form a structure similar to a battlement.

It should be understood that in the embodiments of the present application, a plurality of the fingers are referred to as two or more. In the embodiment of the present application, the number of the clamping structures 120 is three, but it should be understood that the number of the clamping structures 120 provided in the embodiment of the present application is not limited to three, and may also be two, four, five, and the like.

The clamping structure 120 is a strip-shaped structure, and the length direction of the clamping structure is along the Z direction, i.e. the clamping structure 120 is a vertically arranged strip-shaped structure. It should be understood that the end surface of the snap structure 120 is illustrated as being rectangular in fig. 9, but the shape of the snap structure 120 is not limited in the embodiment of the present application, and the end surface shape may also be triangular, trapezoidal, and other shapes.

Referring also to fig. 10, fig. 10 shows a schematic view of the end plate. When the number of the clamping structures 120 is multiple, the number of the corresponding clamping grooves 220 on the end plate 200 is also multiple, and the shape of the end surface of the clamping groove 220 matches the shape of the end surface of the clamping structure 120, which is not described in detail herein.

When the clamping structure 120 is connected to the end plate 200, the clamping structure 120 may be welded to the end plate 200, in addition to the above connection with the clamping groove 220. Thereby, the connection strength of the side plates 100 and the end plates 200 is enhanced, the stability of the case when the case bears the expansion force of the battery is improved, and the stability of the battery module is further improved.

It should be understood that when there are a plurality of clamping structures 120, a structure separate from the bending structure 110 may be adopted. When the split structure is adopted, the clamping structure 120 and the bending structure 110 can be fixedly connected by welding.

Referring to fig. 11, fig. 11 shows a schematic structural diagram of a battery module provided in an embodiment of the present application. The embodiment of the present application also provides a battery module including the case 1000 of any one of the above battery modules and a plurality of batteries 2000 disposed in the case 1000. In the battery module that this application embodiment provided, through adopting to set up the joint structure on bending structure, the joint structure is connected and welded connection together with the block of draw-in groove and is used, has strengthened the joint strength between end plate and the curb plate, improves battery module's casing 1000's intensity, and then has improved battery module's stability.

In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on operational states of the present application, and are only used for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application.

In the description of the present application, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise explicitly stated or limited. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The present application has been described above with reference to preferred embodiments, but these embodiments are merely exemplary and merely illustrative. On the basis of the above, the present application can be subjected to various substitutions and modifications, which are all within the scope of protection of the present application.

Claims

1. A housing of a battery module, comprising: side plates and end plates; the end part of the side plate is provided with a bending structure buckled on the end plate; the end plate is provided with a notch matched with the bending structure;

the bending structure is provided with at least one clamping structure extending towards the inner direction of the shell; the side wall of the notch is provided with a clamping groove which is matched with each clamping structure in a clamping way;

and the bending structure is connected with the end plate in a welding manner.

2. The battery module casing of claim 1, wherein the number of clamping structures is multiple, and the multiple clamping structures are arranged at intervals.

3. The battery module case of claim 2, wherein the plurality of clamping structures are arranged at intervals along the length direction of the end plates.

4. The battery module casing of claim 1, wherein the clamping structure and the bending structure are of a unitary structure.

5. The battery module casing of claim 1, wherein the clamping structure and the bending structure are split structures; and the clamping structure is connected with the split structure in a welding manner.

6. The battery module casing of claim 5, wherein the clamping structure is located between the end face of the bent structure and the side wall of the notch.

7. The battery module case according to any one of claims 1 to 6, wherein the clamping structure is welded to the end plates.

8. The battery module case according to claim 7, wherein the clamping structure is any one of an aluminum plate, an aluminum alloy plate, a nickel alloy plate, a copper plate, and a copper alloy plate.

9. A battery module including a case of the battery module according to any one of claims 1 to 8, and a plurality of batteries disposed in the case.