CN210516801U

CN210516801U - Connection structure and battery module of battery module end plate and curb plate

Info

Publication number: CN210516801U
Application number: CN201921744786.2U
Authority: CN
Inventors: 邓江南; 姜斌; 刘晨南; 钟君焐
Original assignee: Dongguan Tafel New Energy Technology Co Ltd; Jiangsu Tafel New Energy Technology Co Ltd; Jiangsu Tafel Power System Co Ltd
Current assignee: Jiangsu Zenergy Battery Technologies Co ltd
Priority date: 2019-10-17
Filing date: 2019-10-17
Publication date: 2020-05-12
Anticipated expiration: 2029-10-17

Abstract

The utility model relates to a battery module technical field especially relates to a connection structure and battery module of battery module end plate and curb plate. In the connecting structure of the battery module end plate and the side plate, two ends of the end plate are provided with right-angle grooves; the curb plate is L shape, including perpendicular long limit and the minor face of connecting, long limit and the adjacent setting of end plate, the minor face is arranged in the right angle groove and is connected with the right angle groove tailor-welding, and the right angle groove is provided with the welding seam storage tank with the outside of the butt joint gap department of minor face. Due to the structural arrangement, welding surface deposits formed when the end plates and the side plates are welded can be filled into the welding seam accommodating grooves, and obvious protrusions are not formed on the surfaces, so that the influence on the size and the appearance of the battery module is reduced; meanwhile, a preformed groove is not required to be formed in the inner side of the end plate, so that the influence on the tensile strength of the battery module after welding is reduced. And the end plate and the side plate have small processing amount, simple manufacture, high production efficiency and low production cost. The battery module has stable size, attractive appearance and high strength.

Description

Connection structure and battery module of battery module end plate and curb plate

Technical Field

The utility model relates to a battery module technical field especially relates to a connection structure and battery module of battery module end plate and curb plate.

Background

The existing power battery module comprises an end plate, a side plate and a lithium ion battery, wherein the lithium ion battery is arranged in a space formed by the side plate and the end plate. Because the power battery usually bears working conditions of larger mechanical impact, vibration and the like in the use process, the connection between the end plate and the side plate is required to have higher reliability so as to ensure the service life of the lithium ion battery. In order to hold and fix the battery, the end plates and the side plates need to be made of metal plates having high strength, and aluminum alloy is generally used to reduce the weight. At present, the connection mode of the side plates and the end plates is mainly a welding process, common welding processes include laser welding and CMT (Cold Metal Transfer) welding, and the welding process belongs to fusion connection and can generate certain fusion, so that deposits are formed on the welding surfaces of the side plates and the end plates, and the deposits not only remarkably affect the size of the whole module, but also affect the attractiveness of the module.

In order to solve the above technical problems, a structure is proposed in the prior art, as shown in fig. 1-6, a pre-groove 3 'is processed on the inner side of the joint of the module end plate 1' and the side plate 2 'before laser welding to reduce the influence of the welding deposit 4' on the module size and appearance, but the structure has the following disadvantages:

1. the end plate 1' structure needs a large amount of processing to obtain, the manufacturing process is complicated, the production efficiency is low, and the cost is high;

2. as shown in fig. 2-5, the pre-groove 3 ' is located inside the end plate 1 ', and the deposit 4 ' is mainly deposited on the surface of the welded joint, so the pre-groove 3 ' has no obvious effect on reducing the influence of the deposit 4 ' on the size and appearance of the module;

3. because be provided with on the end plate 1 'and reserve groove 3', consequently the back of welding, the tensile strength of this department has certain degree to reduce, has certain influence to the overall structure intensity of battery module.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a connection structure of battery module end plate and curb plate can effectively reduce the influence of welding seam deposit to battery module size and outward appearance, reduces the intensity influence to the battery module simultaneously.

To achieve the purpose, the utility model adopts the following technical proposal:

a connection structure of end plates and side plates of a battery module, comprising:

the two ends of the end plate are provided with right-angle grooves;

the curb plate, the curb plate is L shape, including perpendicular long limit and the minor face of connecting, long limit with the end plate is adjacent to be set up, the minor face is arranged in the right angle groove and with the right angle groove is tailor-welded and is connected, the right angle groove with the outside of butt joint gap department of minor face is provided with the welding seam storage tank.

As a preferred technical scheme, a first chamfer is arranged at the right angle position outside the side wall of the right-angle groove, a second chamfer is arranged at the right angle position outside the short edge, and the first chamfer and the second chamfer form the welding seam accommodating groove.

Preferably, the first chamfer and the second chamfer are symmetrically arranged.

As an optimal technical scheme, a first fillet is arranged at the right angle of the outer side of the side wall of the right-angle groove, a second fillet is arranged at the right angle of the outer side of the short side, and the first fillet and the second fillet form the welding seam accommodating groove.

As a preferred technical solution, the first rounded corner and the second rounded corner are symmetrically arranged.

As a preferred technical scheme, the thickness of the short side is not more than the groove depth of the right-angle groove along the length direction of the battery module.

As a preferred technical scheme, the thickness of the side plate ranges from 0.5mm to 2.5 mm.

Another object of the utility model is to provide a battery module, this battery module stable in size, the outward appearance is pleasing to the eye, and intensity is high.

the utility model provides a battery module, includes electric core, end plate and curb plate, electric core install in the end plate with the curb plate encloses in the space that closes and form, the end plate with adopt as above between the curb plate the connection structure of battery module end plate and curb plate connect.

Compared with the prior art, the utility model discloses an advantage and beneficial effect lie in:

the utility model provides a connecting structure of an end plate and a side plate of a battery module, both ends of the end plate are provided with right-angle grooves; the curb plate is L shape, including perpendicular long limit and the minor face of connecting, long limit and the adjacent setting of end plate, the minor face is arranged in the right angle groove and is connected with the right angle groove tailor-welding, and the right angle groove is provided with the welding seam storage tank with the outside of the butt joint gap department of minor face. Through the structural arrangement, welding surface deposits formed when the end plates and the side plates are welded can be filled into the welding seam accommodating grooves, and obvious protrusions are not formed on the surfaces, so that the influence on the size and the appearance of the battery module is reduced; meanwhile, a preformed groove is not required to be formed in the inner side of the end plate, so that the influence on the tensile strength of the battery module after welding is reduced. And the end plate and the side plate have small processing amount, simple manufacture, high production efficiency and low production cost.

The utility model provides a battery module, including electric core, end plate and curb plate, electric core is installed in end plate and curb plate enclose to close the space that forms, adopts the connection structure connection of foretell battery module end plate and curb plate between end plate and the curb plate. The battery module has stable size, attractive appearance and high strength.

Drawings

Fig. 1 is a plan view of a connection structure of end plates and side plates of a battery module in the related art;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a schematic view of the structure of FIG. 2 after welding;

fig. 4 is a front view of a connection structure of end plates and side plates of a battery module in the related art;

FIG. 5 is an enlarged partial view at B in FIG. 4;

fig. 6 is a schematic structural view of a battery module in the related art;

fig. 7 is a top view of a connection structure of an end plate and a side plate of a battery module according to an embodiment of the present invention;

FIG. 8 is an enlarged partial view at C of FIG. 7;

FIG. 9 is a schematic view of the structure of FIG. 8 after welding;

fig. 10 is a front view of a connection structure of an end plate and a side plate of a battery module according to an embodiment of the present invention;

FIG. 11 is an enlarged partial view taken at D in FIG. 10;

fig. 12 is a schematic structural diagram of a battery module according to an embodiment of the present invention.

In the figure:

1' -an end plate; 2' -side plate; 3' -reserving a groove; 4' -accretion;

1-an end plate; 2-side plate; 3-a weld joint accommodating groove; 4-accretion;

11-first chamfer;

21-long side; 22-short side; 221-second chamfer.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. 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.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only 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 and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 7 and 8, the present embodiment provides a connection structure of an end plate and a side plate of a battery module, which includes an end plate 1 and a side plate 2, wherein both ends of the end plate 1 are provided with right-angle grooves; curb plate 2 is L shape, including perpendicular long limit 21 and the minor face 22 of connecting, long limit 21 sets up with end plate 1 is adjacent, and minor face 22 is arranged in the right angle groove and is connected with the right angle groove tailor-welding, and the outside of the butt joint gap department of right angle groove and minor face 22 is provided with welding seam storage tank 3.

Through the structural arrangement, as shown in fig. 9-11, the welding surface deposits 4 formed when the end plate 1 and the side plate 2 are welded can be filled in the welding seam accommodating groove 3, and no obvious protrusion is formed on the surface, so that the influence on the size and the appearance of the battery module is reduced; and the machining amount of the end plate 1 and the side plate 2 is small, the manufacturing is simple, the production efficiency is high, and the production cost is reduced. In addition, the inner side of the end plate 1 does not need to be processed with a reserved groove, so that the side plate 2 and the end plate 1 can be attached to each other, tension capable of being borne between the end plate 1 and the side plate 2 after welding is large, and welding strength is high.

In the prior art, due to the influence of the structure of the end plate 1, a preformed groove can be formed only on one side of the joint of the end plate 1 and the side plate 2, a molten pool formed during welding is of a symmetrical structure, and the preformed groove can only reduce the influence of deposits 4 on the size and the appearance of a battery module on one side, so the effect is poor.

In order to solve this problem, in the present embodiment, as shown in fig. 8, a first chamfer 11 is provided at a right angle outside the right-angle groove side wall, a second chamfer 221 is provided at a right angle outside the short side 22, and the first chamfer 11 and the second chamfer 221 form the weld receiving groove 3. Preferably, the first chamfer 11 and the second chamfer 221 are symmetrically disposed.

In another embodiment, a first fillet is provided at the right angle outside the right-angle groove side wall, a second fillet is provided at the right angle outside the short side 22, and the first fillet and the second fillet form the weld receiving groove 3. Preferably, the first rounded corner and the second rounded corner are symmetrically arranged.

Through the setting of above-mentioned symmetrical structure for welding seam storage tank 3 forms symmetrical structure, has realized the symmetry tailor-welding of end plate 1 and curb plate 2, consequently welding seam storage tank 3 can be better hold the symmetry molten bath that the welding formed, has realized the two sides reduction of deposit 4, thereby is showing the influence that reduces deposit 4 to battery module size and outward appearance.

In the present embodiment, the thickness of the short side 22 is not greater than the groove depth of the right-angle groove in the lengthwise direction of the battery module. The thickness direction of minor face 22 is the length direction of battery module promptly, and this structural setting can prevent

end plate

1 and 2 welded back minor face 22's thickness protrusion battery module's length direction to prevent that the length of curb plate 2 from surpassing the length of battery module, guarantee the wholeness of battery module size.

Furthermore, the lap welding or penetration welding used in the prior art requires a thinner welded substrate and a thicker welded substrate so as to penetrate the welded substrate. The side plates 2 and the end plates 1 in the embodiment are connected by tailor welding, so that the thickness of the base material is not limited too much. The thickness of the side plate 2 can be designed according to a specific structure, and preferably, the thickness of the side plate 2 ranges from 0.5mm to 2.5 mm.

This embodiment also provides a battery module, as shown in fig. 12, which is stable in size and beautiful in appearance. This battery module includes electric core, end plate 1 and curb plate 2, and electric core is installed in the space that end plate 1 and curb plate 2 enclose to close and form, adopts the connection structure of foretell battery module end plate and curb plate to connect between end plate 1 and the curb plate 2.

The dimensions and the appearance of the battery module provided in this embodiment after welding, and the structural strength of the battery module were verified through experiments as follows.

First, a comparative scheme 1 and a comparative scheme 2 were designed, the comparative scheme 1 being: the end plate 1 is not provided with a preformed groove, and the end plate 1 and the side plate 2 are not provided with chamfers or fillets to manufacture the battery module. Comparative scheme 2 is: the battery module is manufactured according to the technical scheme in the background art.

Then two sets of verification schemes are set for this embodiment:

verification scheme 1: the battery module is manufactured according to the above-described technical means in the present embodiment.

Verification scheme 2: close to the authentication scheme 1, the difference is that only the right angle outside the short side 22 of the side plate 2 is chamfered or rounded.

The length dimension, appearance effect and welding tension test data of the battery module after welding according to the four schemes are shown in table 1 below. The standard of the length of the battery module in the verification test was 355.00 ± 0.50 mm. The welding strength, namely the welding tension standard is more than or equal to 5000N. The testing method of the welding tension comprises the following steps: in a direction parallel to the direction in which the short sides 22 of the end plate 1 and the side plate 2 are attached to each other and perpendicular to the weld line, a tensile force is applied to pull the side plate 2, and the welding tensile force, i.e., the welding strength, between the end plate 1 and the side plate 2 is examined.

The data in the table can be used for obtaining, and the battery module provided by the embodiment has the connecting structure of the end plate and the side plate, so that the surface is not obviously protruded after welding, the appearance effect is good, the influence on the total length of the battery module is small, and the welding strength of the battery module is higher.

TABLE 1 Strength data after transfer welding of aluminum busbar to copper busbar

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The utility model provides a connection structure of battery module end plate and curb plate which characterized in that includes:

the end plate comprises an end plate (1), wherein right-angle grooves are formed in two ends of the end plate (1);

curb plate (2), curb plate (2) are L shape, including perpendicular long limit (21) and minor face (22) of connecting, long limit (21) with end plate (1) is adjacent to be set up, minor face (22) are arranged in the right angle groove and with the right angle groove tailor-welding is connected, the right angle groove with the outside of the butt joint gap department of minor face (22) is provided with welding seam storage tank (3).

2. The battery module end plate and side plate connecting structure according to claim 1, wherein a first chamfer (11) is provided at a right angle outside the right-angle groove side wall, a second chamfer (221) is provided at a right angle outside the short side (22), and the first chamfer (11) and the second chamfer (221) form the weld receiving groove (3).

3. The battery module end plate and side plate connecting structure according to claim 2, wherein the first chamfer (11) and the second chamfer (221) are symmetrically arranged.

4. The battery module end plate and side plate connecting structure according to claim 1, wherein a first rounded corner is provided at a right angle outside the right-angle groove side wall, a second rounded corner is provided at a right angle outside the short side (22), and the first rounded corner and the second rounded corner form the weld receiving groove (3).

5. The battery module end plate and side plate connecting structure according to claim 4, wherein the first rounded corners and the second rounded corners are symmetrically disposed.

6. The battery module end plate and side plate connecting structure according to claim 1, wherein the thickness of the short side (22) is not greater than the groove depth of the right-angle groove along the length direction of the battery module.

7. The connection structure of the end plate and the side plate of the battery module according to any one of claims 1 to 6, wherein the thickness of the side plate (2) ranges from 0.5mm to 2.5 mm.

8. A battery module, comprising an electric core, an end plate (1) and a side plate (2), wherein the electric core is installed in a space enclosed by the end plate (1) and the side plate (2), and the end plate (1) and the side plate (2) are connected by using the connection structure of the end plate and the side plate of the battery module according to any one of claims 1 to 7.