CN114530650A

CN114530650A - Battery module

Info

Publication number: CN114530650A
Application number: CN202210282229.3A
Authority: CN
Inventors: 田原松; 蔡圣添
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-03-21
Filing date: 2022-03-21
Publication date: 2022-05-24

Abstract

The invention relates to the technical field of battery modules, and discloses a battery module, which comprises: the top and the two ends along the length direction of the box body are arranged in an open manner; the battery core assembly is arranged in the box body and comprises a plurality of battery core bodies; the two end plates are respectively positioned at the two ends of the box body along the length direction, and each end plate is welded on the box body; the two connecting assemblies are respectively fixed on the two end plates; and the cooling plate is bonded on the top of the electric core assembly. According to the battery module disclosed by the invention, the top of the box body and the two ends in the length direction are both arranged in an open manner, so that the electric core assembly can be directly bonded in the box body, the installation is convenient, the two connecting assemblies are respectively fixed on the two end plates, and the cooling plate is bonded on the electric core assembly, so that the service life of the battery module is prolonged.

Description

Battery module

Technical Field

The invention relates to the technical field of battery modules, in particular to a battery module.

Background

Present battery module comprises the laminate polymer battery core of rectangular shape mostly, and the battery module of rectangular shape electric core is still few, and the battery module of laminate polymer battery is the box of a mouthful font aluminium section bar side tube-shape, embolias the laminate polymer battery core who piles up, then packs into two end plates, and the welding becomes a battery module, and processing technology is complicated, and the energy density that leads to the battery module is not high. For cooling off electric core subassembly, the bottom of box is equipped with the cooling plate, and the cooling plate passes through connecting bolt and sealing member and box sealing connection to sealed glue of coating in order to prevent the coolant liquid outflow in the cooling plate at the junction of cooling plate, guarantee the leakproofness of cooling plate, the great and use risk that has the weeping after a period of this kind of installation degree of difficulty, be unfavorable for battery module's equipment.

Disclosure of Invention

Based on the above, the present invention is directed to provide a battery module, which simplifies the processing technology of the battery module, prevents the occurrence of leakage of a cooling plate, and improves the energy density of the battery module.

In order to achieve the purpose, the invention adopts the following technical scheme:

a battery module, comprising: the top and the two ends along the length direction of the box body are arranged in an open manner; the battery core assembly is arranged in the box body and comprises a plurality of battery core bodies which are sequentially arranged; the two end plates are respectively positioned at the two ends of the box body along the length direction, and each end plate is welded on the box body; the two connecting assemblies are respectively fixed on the two end plates; and the cooling plate is bonded at the top of the battery cell assembly and can conduct heat with each battery cell body.

As a preferred scheme of battery module, battery module still includes the adhesion structure glue film, the adhesion structure glue film clamp is established electric core subassembly with between the box, so that electric core subassembly bonds in the box.

As an optimal scheme of a battery module, the bonding structure glue film includes bottom structure glue film and two lateral part structure glue films, the bottom structure glue film is located the diapire of box with between the bottom surface of electricity core subassembly, two the lateral part structure glue film is located respectively the relative both sides of electricity core subassembly, every the lateral part structure glue film all is located the side of box with between the side of electricity core body.

As a battery module's preferred scheme, every all be equipped with the buckle on the end plate, every coupling assembling all passes through the buckle joint is in the end plate is close to one side of electricity core subassembly.

As a preferred scheme of battery module, the lower part of end plate be equipped with can with the inner wall complex first face of weld of box, the upper portion of end plate be equipped with can with the inner wall complex second face of weld of box, first face of weld with the second face of weld all with the inner wall welding of box.

As a preferred scheme of the battery module, the battery module further comprises a flexible circuit board assembly, and two ends of the flexible circuit board assembly are electrically connected with the two connecting components respectively.

As a preferred scheme of battery module, the tip of flexible circuit board is equipped with gathers the piece, gather the piece with coupling assembling welds.

As a preferable scheme of the battery module, a buffer member is disposed between the flexible circuit board assembly and the cooling plate, and the buffer member is bonded to at least one of the flexible circuit board assembly and the cooling plate.

As a preferred scheme of a battery module, be equipped with cooling chamber, import and export on the cooling plate, the cooling chamber be used for holding the coolant liquid and with the import with the export intercommunication, the import with the export all is located the cooling plate is close to one side of end plate.

As a preferable scheme of the battery module, both long sides of the cooling plate are welded to the inner wall of the case.

As a preferred scheme of a battery module, every positive pole post and negative pole post of electric core body are located both ends respectively, and is the same electric core body the positive pole post with the negative pole post is just to setting up.

As a preferred scheme of the battery module, the electric core assembly is adhered in the box body, and the top of the electric core assembly is adhered to the cooling plate through a heat conduction structural adhesive layer.

As a preferred scheme of battery module, one coupling assembling includes first busbar, anodal connection piece and negative pole connection piece, first busbar with the electric core subassembly the utmost point post electricity of electric core body is connected with one end is electric, anodal connection piece with the negative pole connection piece is located the both ends of first busbar, another coupling assembling is the second busbar, the second busbar with the electric core subassembly the utmost point post electricity of the other end of electric core body is connected.

The invention has the beneficial effects that: according to the battery module disclosed by the invention, the top of the box body and the two ends in the length direction are both opened, the electric core assembly can be directly arranged in the box body, the installation is convenient, the two connecting assemblies are respectively fixed on the two end plates, each end plate is welded on the box body, and finally the cooling plate is bonded on the electric core assembly, so that the installation difficulty of the cooling plate is reduced, the phenomenon of leakage of the cooling plate is avoided, and the service life of the battery module is prolonged.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention 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 for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

Fig. 1 is a schematic view of a battery module according to an embodiment of the present invention;

fig. 2 is an exploded view of a battery module according to an embodiment of the present invention;

fig. 3 is a schematic view illustrating the engagement of end plates and connection members of a battery module according to an embodiment of the present invention;

fig. 4 is a partial enlarged view of fig. 2 at a.

In the figure:

1. a box body;

2. an electrical core assembly;

3. an end plate; 31. buckling; 32. a square mounting post; 320. a first welding surface; 33. a square mounting block; 330. a second weld face;

4. a connecting assembly; 41. a first bus bar; 42. a positive electrode connecting sheet; 43. a negative electrode connecting sheet; 44. a second bus bar;

5. a cooling plate; 501. an inlet; 502. an outlet;

6. a thermally conductive structural adhesive layer;

7. bonding the structural adhesive layer; 71. a bottom structure glue layer; 72. a side structure glue layer;

8. a flexible circuit board assembly; 81. and (5) collecting the slices.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within 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", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but 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 thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" 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 should be noted that unless otherwise explicitly stated 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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The embodiment provides a battery module, as shown in fig. 1 to 4, including box 1, electricity core subassembly 2, two end plates 3, two coupling assembling 4, cooling plate 5 and heat conduction structure glue film 6, box 1's top all opens the setting with the both ends along length direction, electricity core subassembly 2 sets up in box 1 and includes the electric core body that a plurality of discharged in proper order, two end plates 3 are located box 1 along length direction's both ends respectively, every end plate 3 all welds on box 1, two coupling assembling 4 fix respectively on two end plates 3, cooling plate 5 bonds at the top of electricity core subassembly 2 and can carry out heat-conduction with every electric core body.

Specifically, the box body 1 of the present embodiment is made of an aluminum profile, each end plate 3 is laser-welded to the end of the box body 1, and the box body 1 includes a bottom plate and two side plates located on opposite sides of the bottom plate. In other embodiments, the box body 1 may also be made of other plates, which are specifically determined according to the actual requirements of users. It should be noted that, cooling plate 5 of this embodiment is located electric core subassembly 2's top, and cooling plate 5 is direct to contact with external environment, has increased cooling plate 5 and external heat transfer ability for electric core subassembly 2's temperature obtains reducing, and the liquid cooling board of this embodiment passes through thermal structure glue film fixed connection, simple to operate with electric core subassembly 2.

The electric core assembly 2 of this embodiment bonds in box 1, bonds through heat conduction structure glue film 6 between the top of electric core assembly 2 and cooling plate 5 for cooling plate 5 bonds at the top of electric core assembly 2. The heat-conducting structure adhesive layer 6 of the embodiment is formed by mixing heat-conducting adhesive and structure adhesive and then coating the mixture on the top of the electric core assembly 2, and the heat-conducting structure adhesive has the characteristics of good heat-conducting property, high strength, capability of bearing larger load, aging resistance, fatigue resistance, corrosion resistance and stable performance in the expected service life. When bonding cooling plate 5 on electric core subassembly 2, at first coat thermal structure glue film 6 on electric core subassembly 2's top surface, then place cooling plate 5 at electric core subassembly 2's top from top to bottom again to exert certain pressure to the liquid cooling plate, make cooling plate 5 firmly bond on electric core subassembly 2 through thermal structure glue film 6, realize cooling plate 5 and electric core subassembly 2's fixed connection.

The battery module that this embodiment provided, because box 1's top and the both ends along length direction all open the setting, can directly bond electric core subassembly 2 in box 1, it is comparatively convenient to install, two coupling assembling 4 are fixed respectively on two end plates 3, every end plate 3 all welds on box 1, at last rethread thermal structure glue film 6 bonds cooling plate 5 on electric core subassembly 2, the thermal conductivity glue film 6 of use has promoted electric core subassembly 2 and cooling plate 5's heat transfer ability, the installation degree of difficulty of cooling plate 5 has been reduced, the phenomenon of having avoided 5 weepings of cooling plate takes place, the life of battery module has been prolonged.

As shown in fig. 2, the battery module of this embodiment further includes an adhesive layer 7, and the adhesive layer 7 is disposed between the cell assembly 2 and the case 1, so that the cell assembly 2 is adhered to the case 1. Specifically, as shown in fig. 2, the bonding structure adhesive layer 7 includes a bottom structure adhesive layer 71 and two side structure adhesive layers 72, the bottom structure adhesive layer 71 is located between the bottom wall of the box 1 and the bottom surface of the cell assembly 2, the two side structure adhesive layers 72 are respectively located on two opposite sides of the cell assembly 2, and each side structure adhesive layer 72 is located between the side surface of the box 1 and the side surface of the cell body.

Furthermore, the adhesive structure glue layer 7 is formed by coating structural glue on the cell assembly 2 and then curing the structural glue, and the structural glue has the characteristics of high strength, capability of bearing larger load, aging resistance, fatigue resistance, corrosion resistance and stable performance in the expected life, so that the cell assembly 2 can be firmly adhered in the box body 1. When installing electric core subassembly 2 in box 1, at first coat one side structure respectively on two lateral walls on the diapire of box 1 and glue, then place electric core subassembly 2 in box 1, two lateral walls of box 1 bond with two lateral walls of electric core subassembly 2 respectively, and the diapire of box 1 bonds together with the bottom surface of electric core, has guaranteed electric core subassembly 2 and box 1's joint strength.

As shown in fig. 3, each end plate 3 of this embodiment is provided with a buckle 31, and each connecting assembly 4 is connected to one side of the end plate 3 close to the electric core assembly 2 through the buckle 31, that is, the connecting assembly 4 is detachably mounted on one side of the end plate 3 close to the electric core assembly 2. As shown in fig. 2 and 3, the lower portion of the end plate 3 of the present embodiment is provided with a first welding surface 320 capable of being engaged with the inner wall of the case 1, the upper portion of the end plate 3 is provided with a second welding surface 330 capable of being engaged with the inner wall of the case 1, and both the first welding surface 320 and the second welding surface 330 are welded to the inner wall of the case 1. Specifically, as shown in fig. 2 and 3, square mounting posts 32 are respectively arranged at two ends of the lower portion of the box body 1, one side of each square mounting post 32, which can be in contact with the side of the box body 1, is a first welding surface 320, square mounting blocks 33 are respectively arranged at two ends of the upper portion of the box body 1, one side of each square mounting block 33, which can be in contact with the side of the box body 1, is a second welding surface 330, the welding area of the end plate 3 and the box body 1 can be increased by the first welding surface 320 and the second welding surface 330, and the firmness of connection between the end plate 3 and the box body 1 is ensured.

The connection assembly 4 and the end plate 3 are operated according to the following steps when mounted on the case 1: firstly, two connecting components 4 are respectively clamped on two end plates 3; then, each end plate 3 with the connecting assembly 4 is installed on the box body 1 from outside to inside, at the moment, the first welding surface 320 and the second welding surface 330 of each end plate 3 are opposite to the side surface of the box body 1, and the connecting assembly 4 is electrically connected with the pole of the cell body; and finally, fixedly connecting the end plate 3 with the box body 1 by laser welding.

As shown in fig. 1 and fig. 2, the battery module of the present embodiment further includes a flexible circuit board assembly 8, and two ends of the flexible circuit board assembly 8 are electrically connected to the two connecting components 4, respectively. As shown in fig. 2, the end of the flexible circuit board is provided with a collecting sheet 81, the collecting sheet 81 is a nickel sheet, the collecting sheet 81 is welded to the connecting assembly 4, and the collecting sheet 81 can collect signals such as voltage, current and temperature of the core assembly 2 through the connecting assembly 4. A buffer member (not shown) is disposed between the flexible circuit board assembly 8 and the cooling plate 5, and is bonded to the flexible circuit board assembly 8, and the buffer member plays a role of protecting the flexible circuit board assembly 8. In other embodiments, the buffer member may be bonded to the cooling plate 5, or may be bonded to both the cooling plate 5 and the flexible circuit board.

Specifically, in the embodiment, two connection assemblies 4 connect a plurality of cell bodies of the cell assembly 2 in series, as shown in fig. 2 and 4, one of the connection assemblies 4 includes a first bus bar 41, a positive connecting piece 42 and a negative connecting piece 43, the first bus bar 41 includes a plurality of sub-bus bars connected in sequence, each sub-bus bar is in contact with or welded to one electrode column of the cell body, the positive connecting piece 42 and the negative connecting piece 43 are located at two ends of the first bus bar 41, the positive connecting piece 42 and the negative connecting piece 43 are in contact with or welded to one electrode column at one end of the cell body, so as to achieve that the connection assembly 4 is electrically connected to the electrode column at the same end of the cell body, the positive connecting piece 42 and the negative connecting piece 43 are used for collecting current, the other connection assembly 4 is a second bus bar 44, the second bus bar 44 is in contact with or welded to the electrode column at the other end of the cell body, so as to realize that the connecting component 4 is electrically connected with the pole at the other end of the battery core body. In other embodiments, the two connection assemblies 4 may further connect a plurality of cell bodies of the cell assembly 2 in parallel, or simultaneously implement series connection and parallel connection, and are specifically set according to actual needs.

Specifically, two utmost points of every electric core body of this embodiment are positive post and negative pole post respectively, and the positive post and the negative pole post of every electric core body are located both ends respectively, and the positive post and the negative pole post of same electric core body are just to setting up. Further, the positive pole of each cell body of the embodiment is located at the center of one end face of the cell body, and the negative pole is located at the center of the other end face of the cell body. Compared with the battery cell body with the staggered positive pole and negative pole, the battery cell body with the structure has the advantages that the structure of the plurality of sub bus pieces is the same, the processing cost of the connecting assembly 4 and the end plate 3 can be reduced, in addition, the area of the first bus bar 41 is reduced compared with that of the existing first bus bar, and the space of the battery module below the first bus bar 41 is increased.

As shown in fig. 2, the cooling plate 5 of the present embodiment is provided with a cooling cavity (not shown), an inlet 501 and an outlet 502, the cooling cavity is used for accommodating a cooling liquid and is communicated with the inlet 501 and the outlet 502, and the inlet 501 and the outlet 502 are both located on one side of the cooling plate 5 close to the end plate 3. Specifically, the inlet 501 and the outlet 502 of the present embodiment are located at the same end of the cooling plate 5, so as to facilitate adding the cooling fluid into the cooling cavity or extracting the cooling fluid from the cooling cavity.

The cooling plate 5 of this embodiment is welded on the box 1, and both long sides of the cooling plate 5 are welded with the inner wall of the box 1. Specifically, the long side of the cooling plate 5 and the inner wall of the case 1 are laser welded, and a protective gas having a low temperature is blown into the welding position during welding in order to prevent the liquid cooling plate from being overheated.

The assembly process of the battery module of the present embodiment is as follows:

respectively coating structural adhesive on the inner walls of the bottom and the side of the box body 1 to form a bottom structural adhesive layer 71 and a side structural adhesive layer 72;

the electric core assembly 2 is arranged in the box body 1, and the electric core assembly 2 is bonded in the box body 1 through the bottom structure adhesive layer 71 and the side structure adhesive layer 72;

the connecting component 4 is clamped at the inner side of the end plate 3;

welding the end plate 3 provided with the connecting component 4 on the box body 1 by laser;

coating heat-conducting structural adhesive on the top surface of the electric core assembly 2 to form a heat-conducting structural adhesive layer 6;

the cooling plate 5 is bonded on the top of the electric core component 2 through a heat conducting structural adhesive layer 6;

two long edges of the cooling plate 5 are welded with the inner wall of the box body 1, and protective gas with lower temperature can be blown in for preventing overheating during welding;

bonding the buffer member to the flexible circuit board assembly 8;

both ends of the flexible circuit board assembly 8 to which the buffer members are bonded are laser spot welded to the first bus bar 41 and the second bus bar 44, respectively.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements and substitutions will now be apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A battery module, comprising:

the box body (1) is provided with an open top and two open ends along the length direction;

the battery core assembly (2) is arranged in the box body (1) and comprises a plurality of battery core bodies which are sequentially arranged;

the two end plates (3) are respectively positioned at two ends of the box body (1) along the length direction, and each end plate (3) is welded on the box body (1);

the two connecting assemblies (4) are respectively fixed on the two end plates (3);

and the cooling plate (5) is bonded at the top of the electric core assembly (2) and can be thermally conducted with each electric core body.

2. The battery module according to claim 1, further comprising an adhesive structural adhesive layer (7), wherein the adhesive structural adhesive layer (7) is sandwiched between the cell assembly (2) and the case (1) so as to adhere the cell assembly (2) in the case (1).

3. The battery module according to claim 2, wherein the adhesive structural adhesive layer (7) comprises a bottom structural adhesive layer (71) and two side structural adhesive layers (72), the bottom structural adhesive layer (71) is located between the bottom wall of the box body (1) and the bottom surface of the cell assembly (2), the two side structural adhesive layers (72) are respectively located at two opposite sides of the cell assembly (2), and each side structural adhesive layer (72) is located between a side surface of the box body (1) and a side surface of the cell body.

4. The battery module according to claim 1, wherein each end plate (3) is provided with a buckle (31), and each connecting assembly (4) is clamped on one side of the end plate (3) close to the cell assembly (2) through the buckle (31).

5. The battery module according to claim 1, wherein the lower portion of the end plate (3) is provided with a first welding surface (320) capable of being engaged with the inner wall of the case (1), the upper portion of the end plate (3) is provided with a second welding surface (330) capable of being engaged with the inner wall of the case (1), and the first welding surface (320) and the second welding surface (330) are both welded to the inner wall of the case (1).

6. The battery module according to claim 1, further comprising a flexible circuit board assembly (8), wherein both ends of the flexible circuit board assembly (8) are electrically connected to the two connecting members (4), respectively.

7. The battery module according to claim 6, wherein the end of the flexible circuit board is provided with a collecting sheet (81), and the collecting sheet (81) is welded with the connecting component (4).

8. The battery module according to claim 6, wherein a buffer member is provided between the flexible circuit board assembly (8) and the cooling plate (5), and the buffer member is bonded to at least one of the flexible circuit board assembly (8) and the cooling plate (5).

9. The battery module according to any one of claims 1 to 8, wherein the cooling plate (5) is provided with a cooling cavity, an inlet (501) and an outlet (502), the cooling cavity is used for containing cooling liquid and is communicated with the inlet (501) and the outlet (502), and the inlet (501) and the outlet (502) are both positioned on one side of the cooling plate (5) close to the end plate (3).

10. The battery module according to any one of claims 1 to 8, wherein both long sides of the cooling plate (5) are welded to the inner wall of the case (1).

11. The battery module according to any one of claims 1 to 8, wherein the positive pole and the negative pole of each cell body are located at two ends, and the positive pole and the negative pole of the same cell body are arranged right opposite to each other.

12. The battery module according to claim 1, wherein the cell assembly (2) is bonded in the case (1), and the top of the cell assembly (2) and the cooling plate (5) are bonded together by a thermal conductive adhesive layer (6).

13. The battery module according to claim 1, wherein one of the connecting members (4) comprises a first bus bar (41), a positive connecting piece (42) and a negative connecting piece (43), the first bus bar (41) is electrically connected with a pole at the same end of the cell body of the cell assembly (2), the positive connecting piece (42) and the negative connecting piece (43) are located at two ends of the first bus bar (41), the other connecting member (4) is a second bus bar (42), and the second bus bar (42) is electrically connected with a pole at the other end of the cell body of the cell assembly (2).