CN216161858U - Box of battery module and battery module - Google Patents

Abstract

The utility model is suitable for the field of power batteries, and provides a battery module and a box body thereof, wherein the box body of the battery module comprises an upper plate, a lower plate, two side plates and two end plates, wherein the two side plates and the two end plates are positioned between the upper plate and the lower plate; and/or at least one end plate comprises a plate main body and a lower lapping part which is arranged at the lower side of the connecting plate main body and extends towards the lower plate, a lower limiting groove is arranged on the surface of the end plate facing the lower plate, when the end plate is connected with the lower plate, the lower limiting groove is inserted into the lower plate, and the lower lapping part is lapped below the lower plate and is connected with the lower plate in a welding way. The battery module provided by the utility model can reduce the risk of weld cracking at the welding positions of the upper plate, the lower plate and the end plate, and improve the pressure resistance of the box body.

Description

Box of battery module and battery module

Technical Field

The utility model belongs to the field of power batteries, and particularly relates to a battery module and a box body thereof.

Background

The box of battery module includes upper plate and the hypoplastron that upper and lower interval set up to and be located two curb plates and two end plates between upper plate and the hypoplastron, and the long limit of connecting upper plate and hypoplastron is respectively followed to the upper and lower board of two curb plates relative settings and arbitrary curb plate, and the minor face of connecting upper plate and hypoplastron is respectively followed to the upper and lower board of two end plates relative settings and arbitrary end plate. The four sides of the end plate are welded with the adjacent plates (the upper plate, the lower plate and the two side plates), and the welding position is positioned at the right-angle joint of the end plate and the adjacent plates. Because the welded position is the position of box stress concentration, under the condition that the box receives external force extrusion, the fracture takes place easily in the welding seam, and in case the fracture, then the terminal plate compressive capacity obviously descends, and the terminal plate is inwards out of shape and then probably leads to adjacent utmost point ear or busbar in the box to take place the contact and bring the circumstances of electric core short circuit, thermal runaway.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provides a battery module and a box body thereof, which aim to improve the pressure resistance of the box body.

In order to achieve the above purpose, the embodiment of the present invention provides the following technical solutions:

the first aspect is that the box body of the battery module comprises an upper plate and a lower plate which are arranged at an upper interval and a lower interval, and two side plates and two end plates which are positioned between the upper plate and the lower plate, wherein the two side plates are oppositely arranged, the upper plate edge and the lower plate edge of any side plate are respectively connected with the long edges of the upper plate and the lower plate, the two end plates are oppositely arranged, the upper plate edge and the lower plate edge of any end plate are respectively connected with the short edges of the upper plate and the lower plate, at least one end plate comprises a plate main body and an upper lapping part which is arranged on the upper edge side of the connecting plate main body and extends towards the upper plate, the surface of the end plate facing the upper plate is provided with an upper limiting groove, when the end plate is connected with the upper plate, the upper plate is spliced with the upper limiting groove, and the upper lapping part is lapped above the upper plate and is welded with the upper plate; and/or at least one end plate comprises a plate main body and a lower lapping part which is arranged at the lower side of the connecting plate main body and extends towards the lower plate, a lower limiting groove is arranged on the surface of the end plate facing the lower plate, when the end plate is connected with the lower plate, the lower limiting groove is inserted into the lower plate, and the lower lapping part is lapped below the lower plate and is connected with the lower plate in a welding way.

Through adopting above-mentioned technical scheme, go up the setting that lap-joint portion overlapped in the upper plate top for the right angle switching department of upper plate and end plate is deviated to the welding position of upper plate and end plate, and moves to the tip that lap-joint portion deviates from the end plate. In other words, the position of the welding seam deviates from the position where the stress of the tank body is most concentrated, so that the risk of the welding seam cracking can be reduced, and the pressure resistance of the tank body is improved. The end plate is provided with an upper limiting groove, and the upper limiting groove is used for placing the upper plate and limiting the relative movement of the upper plate and the end plate in the vertical direction. Under the circumstances that the end plate is compressed, go up the spacing groove and provide the effort that restricts the upper plate and remove to reduce the effort that the welding seam actually bore, with the risk that further reduces the welding seam and split, improve the compressive capacity of box.

Optionally, the upper surface of the upper plate is recessed to form an upper overlapping groove for placing the upper overlapping part; the lower surface of the lower plate is sunken to form a lower lap joint groove for the lower lap joint part to be placed in.

Through adopting above-mentioned technical scheme, when the end plate received the extrusion, the cell wall of going up the overlap joint groove provided opposite direction's holding power to last overlap joint portion, and the cell wall of lower overlap joint groove provides opposite direction's holding power to overlap joint portion down to can reduce the effort that the welding seam actually bore, reduce the risk that the welding seam splits, improve the compressive capacity of box.

Optionally, the upper surface of the upper overlapping part and the upper surface of the upper plate are arranged in a coplanar manner, and the lower surface of the lower overlapping part and the lower surface of the lower plate are arranged in a coplanar manner.

By adopting the technical scheme, the welding of the upper plate, the lower plate and the end plate can be welded by adopting flat welding by the arrangement, so that the welding efficiency and the welding quality are improved, and the appearance is beautified.

Optionally, the end plate at least located on the current output side of the battery module is provided with an upper lap joint part and an upper limiting groove.

Through adopting above-mentioned technical scheme, the compressive capacity of the end plate of reinforcement current output one side to reduce the risk that the welding seam splits, improve the compressive capacity of box.

Optionally, the end plate on the current output side of the battery module is further provided with a lower lap joint part and a lower limiting groove.

Through adopting above-mentioned technical scheme, further improve the compressive capacity of box.

Optionally, an upper accommodating groove for accommodating the upper plate is formed in the surface, facing the upper plate, of the end plate located at the end away from the current output end of the battery module, the upper accommodating groove penetrates upwards to the upper surface of the end plate, and the upper plate is welded to the bottom of the upper accommodating groove; and/or the end plate positioned at the end deviating from the current output end of the battery module is provided with a lower accommodating groove for the lower plate to be placed in on the surface facing the lower plate, the lower accommodating groove penetrates downwards to the lower surface of the end plate, and the lower plate is welded with the groove bottom of the lower accommodating groove.

Through adopting above-mentioned technical scheme, when hypoplastron and this end plate welded, the lower cell wall of lower storage tank can restrict the relative movement of hypoplastron and end plate as the holding surface of hypoplastron, is favorable to improving the welding quality of hypoplastron and end plate.

Optionally, the upper plate is bent at the long side of the upper plate to form a bent portion, and the bent portion is overlapped with the side plate and is welded and connected.

Through adopting above-mentioned technical scheme, upper plate and curb plate weld in the overlap joint position after the overlap joint, and the lapped position can provide location and spacing, compares in two dull and stereotyped direct welding, can effectively improve hookup location's intensity.

Optionally, the side plate has a first limit groove, the bending portion has a second limit groove, and when the bending portion is overlapped with the side plate, the bending portion is placed into the first limit groove and the side plate is placed into the second limit groove.

Through adopting above-mentioned technical scheme, put into the second spacing groove on the last reason of curb plate and the lower edge of the portion of bending puts into first spacing groove, and on the one hand, curb plate and the portion of bending are the setting of unsmooth gomphosis and realize spacing each other, the location and the welding operation of convenient assembly. On the other hand, the side plate and the bent portion are engaged with each other in a concave-convex manner to make the surfaces of the side plate and the bent portion smoothly transition, thereby improving the aesthetic effect.

Optionally, the two side plates are integrally provided with the lower plate.

Through adopting above-mentioned technical scheme, reduce the connection fixity of curb plate and hypoplastron and reduce manufacturing cost.

In a second aspect, a battery module is provided, which comprises the box body of the battery module.

Through adopting above-mentioned technical scheme, reduce the effort that the welding department of upper plate, hypoplastron and end plate actually bore, reduce the risk that the welding seam splits, improve the compressive capacity of box.

Drawings

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

Fig. 1 is a schematic overall structure diagram of a box of a battery module according to an embodiment of the present invention;

FIG. 2 is a first exploded view of the structure of FIG. 1;

FIG. 3 is a second exploded view of the structure of FIG. 1, partially schematic;

FIG. 4 is a schematic cross-sectional view taken along line A-A of the structure of FIG. 1;

FIG. 5 is a schematic cross-sectional view taken along line B-B of the structure of FIG. 1;

FIG. 6 is an enlarged view of portion C of the structure of FIG. 4;

FIG. 7 is an enlarged view of portion D of the structure of FIG. 4;

FIG. 8 is an enlarged view of portion E of the structure of FIG. 4;

fig. 9 is a partial enlarged view of structure F of fig. 5.

Wherein, in the figures, the respective reference numerals:

10. an upper plate; 101. an upper lap joint groove; 11. a bending part; 102. a second limit groove; 20. a lower plate; 30. A side plate; 301. a first limit groove; 40. an end plate; 40B, a left end plate; 40A, a right end plate; 41. a plate main body; 42. an upper lap joint part; 43. a lower lap joint part; 401. and a through hole.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention 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 utility model and are not intended to limit the utility model.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Referring to fig. 1 to 9, a case of a battery module and a battery module using the case provided herein will now be described.

Referring to fig. 1 and 2, the case of the battery module includes an upper plate 10 and a lower plate 20 disposed at an interval from top to bottom, and two side plates 30 and two end plates 40 disposed between the upper plate 10 and the lower plate 20, wherein the two side plates 30 are disposed opposite to each other, the upper plate edge and the lower plate edge of any one side plate 30 are respectively connected to the long sides of the upper plate 10 and the lower plate 20, the two end plates 40 are disposed opposite to each other, and the upper plate edge and the lower plate edge of any one end plate 40 are respectively connected to the short sides of the upper plate 10 and the lower plate 20. For convenience of description, the two end plates 40 are labeled as a left end plate 40B and a right end plate 40A depending on the position. The upper plate 10, the lower plate 20, the side plates 30 and the end plates 40 together enclose a cavity for accommodating structural members such as a battery cell.

In the conventional case, four sides of the end plate 40 are welded to the adjacent plates (the upper plate 10, the lower plate 20, and the two side plates 30), and the welding position is located at the right-angle joint of the end plate 40 and the adjacent plates. When the compression test is performed on the battery module, inward pressure is applied to the end plates 40 on both sides, and the welded joints between the end plates 40 and the upper and lower plates 10 and 20 are weak points and are most likely to crack. And once the weld is cracked, the restraining force of the end plate 40 from the upper plate 10 and the lower plate 20 is reduced, and the end plate 40 is easily moved relative to the upper plate 10 or the lower plate 20 and further deformed toward the middle to assume an inwardly depressed state. Along with the inward recess of end plate 40, the inside electric core of box receives the extrusion of end plate 40 and may bring the problem of electric core damage, and adjacent utmost point ear or busbar in the box can be because of the extrusion of end plate 40 takes place the contact, produces the short circuit, causes the condition of electric core thermal runaway in turn.

The present embodiment provides a tank body, in which the structure of the connection position of the upper plate 10, the lower plate 20 and the end plate 40 is improved to improve the pressure resistance of the tank body.

In one embodiment, referring to fig. 3, 4 and 6, at least one end plate 40 includes a plate main body 41 and an upper engaging portion 42 connecting an upper side of the plate main body 41 and extending toward the upper plate 10, the end plate 40 has an upper engaging groove on a surface facing the upper plate 10, when the end plate 40 is connected to the upper plate 10, the upper plate 10 is inserted into the upper engaging groove, and the upper engaging portion 42 is engaged over the upper plate 10 and welded to the upper plate 10.

In another embodiment, referring to fig. 3, 4 and 7, at least one end plate 40 includes a plate main body 41 and a lower bridging portion 43 connecting the lower side of the plate main body 41 and extending toward the lower plate 20, the end plate 40 has a lower limiting groove on the surface facing the lower plate 20, when the end plate 40 is connected to the lower plate 20, the lower limiting groove is inserted into the lower plate 20, and the lower bridging portion 43 is bridged below the lower plate 20 and welded to the lower plate 20.

In still another embodiment, referring to FIGS. 3, 4, 6 and 7, at least one of the end plates 40 includes a plate main body 41, an upper strap 42 connecting an upper side of the plate main body 41 and extending in a direction toward the upper plate 10, and a lower strap 43 connecting a lower side of the plate main body 41 and extending in a direction toward the lower plate 20; the surface of the end plate 40 facing the upper plate 10 is provided with an upper limiting groove, when the end plate 40 is connected with the upper plate 10, the upper plate 10 is inserted into the upper limiting groove, and the upper overlapping part 42 is overlapped above the upper plate 10 and is welded with the upper plate 10; the end plate 40 has a lower limit groove formed on a surface facing the lower plate 20, and when the end plate 40 is connected to the lower plate 20, the lower plate 20 is inserted into the lower limit groove, and the lower lap portion 43 is overlapped below the lower plate 20 and welded to the lower plate 20.

In this embodiment, the upper overlapping part 42 is arranged above the upper plate 10, so that the welding position of the upper plate 10 and the end plate 40 deviates from the right-angle joint of the upper plate 10 and the end plate 40, and moves to the end part of the upper overlapping part 42 deviating from the end plate 40. In other words, the position of the welding seam deviates from the position where the stress of the tank body is most concentrated, so that the risk of the welding seam cracking can be reduced, and the pressure resistance of the tank body is improved. The end plate 40 is provided with an upper limit groove for receiving the upper plate 10 and limiting the relative movement of the upper plate 10 and the end plate 40 in the vertical direction. Under the condition that the end plate 40 is compressed, the upper limiting groove provides acting force for limiting the movement of the upper plate 10, so that the acting force actually borne by the welding line is reduced, the risk of cracking of the welding line is further reduced, and the pressure resistance of the box body is improved. Similarly, the lower straps 43 are disposed under the lower plate 20 such that the welding position of the lower plate 20 and the end plate 40 is offset from the right angle joint of the lower plate 20 and the end plate 40, and moved to the end of the lower straps 43 opposite the end plate 40. In other words, the position of the welding seam deviates from the position where the stress of the tank body is most concentrated, so that the risk of the welding seam cracking can be reduced, and the pressure resistance of the tank body is improved. The end plate 40 is provided with a lower limit groove for receiving the lower plate 20 and limiting the relative movement between the lower plate 20 and the end plate 40 in the vertical direction. In the case that the end plate 40 is compressed, the lower limiting groove provides a force limiting the movement of the lower plate 20, thereby reducing the force actually borne by the weld, further reducing the risk of weld cracking, and improving the pressure resistance of the box body.

By last, the box of the battery module and the battery module that adopts this box that this embodiment provided, through the overlap joint welding design of last overlap joint portion 42 and upper plate 10, go up spacing design of spacing groove to upper plate 10, through the overlap joint welding design of lower overlap joint portion 43 and hypoplastron 20, spacing design of spacing groove to hypoplastron 20 down, reduce the effort that the actual bearing of the welding department of upper plate 10, hypoplastron 20 and end plate 40, reduce the risk that the welding seam splits, improve the compressive capacity of box.

In another embodiment of the present application, referring to fig. 3 and 6, the upper plate 10 is recessed downward at a side near the end plate 40 to form an upper overlapping groove 101 for accommodating the upper overlapping portion 42; the lower plate 20 is recessed upward at a side near the end plate 40 to form a lower overlapping groove for accommodating the lower overlapping portion 43.

Taking the case that the end plate 40 is located at the right side of the upper plate 10, i.e. the right end plate 40A, referring to fig. 3 and 6, the upper surface of the upper plate 10 is recessed downward near the right side plate edge to form an upper overlapping groove 101, and it can be understood that the upper overlapping groove 101 extends rightward to the right side plate edge of the upper plate 10 so that the upper overlapping portion 42 is inserted into the upper overlapping groove 101 from the right side. The upper overlapping part 42 is placed in the upper overlapping groove 101, and the left side surface of the upper overlapping part 42 is abutted against the groove wall of the upper overlapping groove 101 and is welded and fixed. When the end plate 40 is extruded, the groove wall of the upper overlapping groove 101 provides a supporting force with opposite directions for the upper overlapping part 42, so that the acting force actually borne by the welding line can be reduced, the risk of cracking of the welding line is reduced, and the pressure resistance of the box body is improved. Similarly, the lower surface of the lower plate 20 is recessed downward near the right side plate edge to form a lower overlapping groove, and it can be understood that the lower overlapping groove extends rightward to the right side plate edge of the lower plate 20 to allow the lower overlapping portion 43 to be placed into the lower overlapping groove from the right side. Referring to fig. 7, the lower overlapping portion 43 is disposed in the lower overlapping groove, and the left side surface of the lower overlapping portion 43 is abutted against the groove wall of the lower overlapping groove and welded and fixed. When the end plate 40 receives the extrusion, the cell wall of lower overlap joint groove provides opposite direction's holding power to overlap joint portion 43 down to can reduce the effort that the welding seam actually bore, reduce the risk that the welding seam splits, improve the compressive capacity of box.

Laser welding or seam welding may be used between the upper joint 42 and the upper plate 10 and between the lower joint 43 and the lower plate 20.

Preferably, referring to fig. 6 and 7, the upper surface of the upper overlapping portion 42 is disposed coplanar with the upper surface of the upper plate 10, and the lower surface of the lower overlapping portion 43 is disposed coplanar with the lower surface of the lower plate 20. This arrangement enables welding of the upper plate 10 and the end plate 40 by flat welding. The assembled case may be turned upside down and then the lower plate 20 and the end plate 40 may be welded by flat welding. Flat welding is one of the most advantageous spatial locations for the welding operation. Compared with T-shaped welding, the welding efficiency and the welding quality can be improved. In addition, the upper surface of the upper overlapping part 42 is coplanar with the upper surface of the upper plate 10, and the lower surface of the lower overlapping part 43 is coplanar with the lower surface of the lower plate 20, so that the joints of the upper plate 10, the lower plate 20 and the end plate 40 are smoothly transited, and the appearance is beautified.

In another embodiment of the present application, referring to fig. 3, at least the end plate 40 (i.e., the right end plate 40A in the drawing) on the current output side of the battery module is provided with an upper bridging portion 42 and an upper limiting groove. The upper plate 10 is correspondingly provided with an upper lap groove 101.

The box of battery module is built-in to have a plurality of electric cores of arranging in order, and each electric core passes through the busbar and realizes the series-parallel connection. The bus bars located end to end are connected to the outer conductor through the end plates 40. In other words, the end plate 40 on the current output side of the battery module is provided with a through hole 401 that avoids the bus bar. The strength of the end plate 40 is reduced due to the opening of the through holes 401. In general, the through-hole 401 is opened in the upper portion of the end plate 40. Set up overlap joint portion 42, last spacing groove at this end plate 40, and cooperate with upper plate 10, strengthen the compressive capacity of welding position to reduce the risk that the welding seam splits, improve the compressive capacity of box.

Preferably, the end plate 40 positioned on the current output side of the battery module (i.e., the right end plate 40A in the drawing) is further provided with a lower engaging portion 43 and a lower limiting groove, and the lower plate 20 is correspondingly provided with the lower engaging groove. This arrangement further improves the pressure resistance of the tank.

In another embodiment of the present application, referring to fig. 4 and 8, an upper receiving groove for receiving the upper plate 10 is formed on a surface of the end plate 40 (i.e., the left end plate 40B in the drawing) facing away from the current output end of the battery module, the upper receiving groove penetrates upward to an upper surface of the end plate 40, and the upper plate 10 is welded to a groove bottom of the upper receiving groove; and/or a lower accommodating groove for accommodating the lower plate 20 is formed in the surface, facing the lower plate 20, of the end plate 40 at the end, away from the current output end of the battery module, the lower accommodating groove penetrates downwards to the lower surface of the end plate 40, and the lower plate 20 is welded to the bottom of the lower accommodating groove.

Taking the case that the end plate 40 is located at the left side of the upper plate 10 (i.e. the left end plate 40B in the drawing), the upper accommodating groove is opened on the right side surface of the end plate 40 and extends upward to the upper surface, so that the upper plate 10 can be directly placed into the upper accommodating groove from above the upper accommodating groove, thereby facilitating the assembly operation. Similarly, the lower overlapping portion 43 is disposed on the right side surface of the end plate 40 and extends downward to the lower surface, so that the lower plate 20 can be directly placed into the lower accommodating groove from the lower accommodating groove, thereby facilitating the assembly operation.

The left end of the upper plate 10 is disposed in the upper accommodating groove, and the left surface of the upper plate 10 is abutted and welded to the groove wall/groove bottom on the left side of the upper accommodating groove. When the upper plate 10 and the end plate 40 are welded, the lower groove wall of the upper accommodating groove can be used as a supporting surface of the upper plate 10 to limit the relative movement of the upper plate 10 and the end plate 40, which is beneficial to improving the welding quality of the upper plate 10 and the end plate 40.

The left end portion of the lower plate 20 is disposed in the lower accommodating groove, and the left side surface of the lower plate 20 abuts against and is welded to the groove wall/groove bottom on the left side of the lower accommodating groove. When the lower plate 20 and the end plate 40 are welded, the lower groove wall of the lower accommodating groove can be used as a supporting surface of the lower plate 20 to limit the relative movement of the lower plate 20 and the end plate 40, which is beneficial to improving the welding quality of the lower plate 20 and the end plate 40.

In combination, the structural design that the right end plate 40A and the upper plate 10 that are located battery module current output one side are connected and are adopted last holding tank, go up overlap joint portion 42, and the left end plate 40B that deviates from battery module current output one side and the connection of upper plate 10 adopt storage tank and the lapped structural design of upper plate 10, relatively speaking, the former can improve hookup location's structural strength, and the latter can reduce structure production design cost. Those skilled in the art can also adopt the structural design of the upper limiting groove and the upper bridging portion 42 for connecting the two end plates 40 and the upper plate 10, which is not limited herein. The coupling structure of the end plate 40 and the lower plate 20 is the same as that of the end plate 40 and the upper plate 10, and thus, detailed description thereof is omitted.

Preferably, the upper receiving groove has a vertical dimension equal to the thickness of the upper plate 10 such that the upper surface of the upper plate 10 is flush with the upper surface of the end plate 40, and the lower receiving groove has a vertical dimension equal to the thickness of the lower plate 20 such that the lower surface of the lower plate 20 and the lower surface of the end plate 40 are flush with the lower surface of the end plate 40. So that the outer side surfaces of the upper plate 10, the lower plate 20 and the end plate 40 are smoothly transited.

In another embodiment of the present application, referring to fig. 2, two side plates 30 are integrally disposed with the lower plate 20. The two side plates 30 and the lower plate 20 are stamped and formed from an aluminum plate, or are formed by metal high pressure casting, push casting, or investment casting. This arrangement can reduce the fastening of the connection of the side plates 30 and the lower plate 20 and reduce the manufacturing cost.

In this embodiment, the two side plates 30 and the end plate 40 are directly welded to each other, thereby simplifying the structure and reducing the manufacturing cost.

In another embodiment of the present application, referring to fig. 3 and 5, the upper plate 10 is bent at the long side thereof to form a bent portion 11, and the bent portion 11 overlaps the side plate 30 and is welded and connected thereto. Upper plate 10 and curb plate 30 weld in the overlap joint position after the overlap joint, and the lapped position can provide location and spacing, compares in two dull and stereotyped direct welding, can effectively improve hookup location's intensity.

Preferably, referring to fig. 3 and 5, the side plate 30 has a first limiting groove 301, the bending portion 11 has a second limiting groove 102, and when the bending portion 11 is overlapped with the side plate 30, the bending portion 11 is disposed in the first limiting groove 301 and the side plate 30 is disposed in the second limiting groove 102. The upper edge of the side plate 30 is placed into the second limiting groove 102, and the lower edge of the bent part 11 is placed into the first limiting groove 301, so that on one hand, the side plate 30 and the bent part 11 are arranged in a concave-convex embedded mode to achieve mutual limiting, and positioning and welding operation of assembly are facilitated. On the other hand, the side plate 30 and the bent portion 11 are engaged with each other in a concave-convex manner, so that the surfaces of the side plate 30 and the bent portion 11 are smoothly transited, thereby improving the aesthetic effect.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. A box body of a battery module comprises an upper plate and a lower plate which are arranged at an upper-lower interval, and two side plates and two end plates which are arranged between the upper plate and the lower plate, wherein the two side plates are oppositely arranged, the upper plate edge and the lower plate edge of any one side plate are respectively connected with the long sides of the upper plate and the lower plate, the two end plates are oppositely arranged, the upper plate edge and the lower plate edge of any one end plate are respectively connected with the short sides of the upper plate and the lower plate, it is characterized in that at least one end plate comprises a plate main body and an upper lapping part which is connected with the upper edge side of the plate main body and extends towards the direction of the upper plate, the surface of the end plate facing the upper plate is provided with an upper limiting groove, when the end plate is connected with the upper plate, the upper plate is inserted into the upper limiting groove, and the upper lapping part is lapped above the upper plate and is welded with the upper plate; and/or the presence of a gas in the gas,

at least one end plate includes the board main part and connects board main part downside limit and to the lower overlap joint portion that the hypoplastron direction extends, the end plate is in the orientation the surface of hypoplastron is seted up down the spacing groove, when the end plate with the hypoplastron is connected, the hypoplastron grafting the spacing groove down, the overlap joint portion put in the below of hypoplastron and with hypoplastron welded connection down.

2. A case of a battery module according to claim 1, wherein the upper surface of the upper plate is recessed to form an upper overlapping groove into which the upper overlapping part is inserted; the lower surface of the lower plate is recessed to form a lower lap joint groove for the lower lap joint part to be placed in.

3. A case for battery modules as set forth in claim 1, wherein the upper surface of the upper taps is disposed coplanar with the upper surface of the upper plate, and the lower surface of the lower taps is disposed coplanar with the lower surface of the lower plate.

4. A case for battery modules as set forth in claim 1, wherein at least the end plate on the current output side of the battery module is provided with the upper engaging portion and the upper restraining groove.

5. A case for battery modules as set forth in claim 4, wherein said end plates on the current output side of the battery modules are further provided with said lower engaging portions and said lower restraining grooves.

6. The battery module box body according to claim 1, wherein the end plate located at the end away from the current output end of the battery module is provided with an upper accommodating groove on the surface facing the upper plate, the upper accommodating groove penetrates upward to the upper surface of the end plate, and the upper plate is welded to the bottom of the upper accommodating groove; and/or the end plate located at one end deviated from the current output end of the battery module faces the surface of the lower plate, a lower accommodating groove for the lower plate to be placed in is formed in the surface of the end plate, the lower accommodating groove penetrates downwards to the lower surface of the end plate, and the lower plate is connected with the groove bottom of the lower accommodating groove in a welding mode.

7. A case body for battery modules according to any one of claims 1 to 6, wherein the upper plate is bent at the long side thereof to form bent portions, and the bent portions overlap the side plates and are welded thereto.

8. The case of battery module according to claim 7, wherein the side plate has a first limiting groove, the bent portion has a second limiting groove, and when the bent portion is overlapped with the side plate, the bent portion is inserted into the first limiting groove and the side plate is inserted into the second limiting groove.

9. A case body of a battery module according to claim 7, wherein the two side plates are integrally provided with the lower plate.

10. A battery module characterized by comprising a case of the battery module according to any one of claims 1 to 9.

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