CN112467188A

CN112467188A - Assembling method of battery module

Info

Publication number: CN112467188A
Application number: CN202011370016.3A
Authority: CN
Inventors: 朱圣法; 白玉龙; 李登科; 宋状; 杨明平; 何亚飞
Original assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Current assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-03-09

Abstract

The invention discloses an assembling method of a battery module. In the present invention, the method for assembling a battery module includes: providing a plurality of battery cells; connecting the battery cells in series, and sequentially spreading the battery cells after being connected in series; and coating an insulating layer on the metal part exposed at the joint of each cell which is laid and unfolded, and folding the cells in an organ folding manner at the joint. Compared with the prior art, the battery module is simple in structure, simple to assemble and safer to use.

Description

Assembling method of battery module

Technical Field

The embodiment of the invention relates to the field of batteries, in particular to an assembling method of a battery module.

Background

In recent years, the appearance of new energy automobiles plays a great role in promoting social development and environmental protection, and a power battery pack is a rechargeable battery, is a power source of the new energy automobiles, and is widely applied to the field of the new energy automobiles. The battery pack comprises a plurality of battery modules, the battery modules are vertically arranged in the outer frame through a plurality of battery cores, the two ends of each battery core are provided with busbars, the busbars support copper bars, and the lugs of the battery cores are connected with the copper bars after passing through the busbars, so that the battery cores are connected in series. The structure part is complex in structure, the difficulty of the battery cell tab penetrating through the bus bar support gap is high, the assembly process is risky, and the quick assembly is not facilitated. And in the module extrusion process, copper bar short circuit easily takes place and catches fire.

Disclosure of Invention

The invention aims to provide an assembly method of a battery module, which enables the battery module to be simple in structure, simple to assemble and safer to use.

In order to solve the above technical problem, an embodiment of the present invention provides an assembly method of a battery module, including:

providing a plurality of battery cells;

connecting the battery cells in series, and sequentially spreading the battery cells after the battery cells are connected in series;

coating an insulating layer on the metal part exposed outside at the connection part of each electric core which is spread and laid;

folding a plurality of the cells over each other at a connection in an accordion-fold manner.

In an embodiment, the step of providing a plurality of cells includes:

and (3) paving and unfolding the cells in sequence, wherein the lugs of two adjacent cells with different polarities are opposite.

In an embodiment, the step of connecting the cells in series includes:

connecting the tab of each battery cell with a bus sheet; two adjacent electric cores are connected in series through the same bus bar;

and the lugs of two cells connected in series with opposite polarities are connected to the same bus bar.

In an embodiment, the step of connecting the tab of each of the battery cells to the tab includes:

and welding the electrode lugs of the battery cell with the corresponding bus plates.

In one embodiment, a circuit module of a battery module includes: the circuit board comprises a circuit board, a first connecting piece and a second connecting piece, wherein the first connecting piece and the second connecting piece are electrically connected with two ends of the circuit board respectively; before the step of coating the insulating layer on the metal part of each cell connecting part exposed outside, the method comprises the following steps:

and electrically connecting the first connecting piece and the second connecting piece with two ends of at least one battery cell respectively.

In one embodiment, the first connector has a plurality of first connecting parts connected with one end of the circuit board; the second connecting piece is provided with at least one second connecting part connected with the other end of the circuit board; the step of electrically connecting the first connecting piece and the second connecting piece with two ends of at least one battery cell respectively specifically includes:

connecting each first connecting part with a tab connected with one tab of the corresponding battery cell;

and connecting each second connecting part with the corresponding bus piece connected with the other electrode lug of the battery cell.

In an embodiment, before the step of folding the plurality of battery cells onto each other in an accordion-folded manner at the connection, the step of coating the insulating layer with the metal portion of each battery cell connection exposed to the outside includes:

and coating an insulating layer on the exposed parts of the battery cells, the bars, the first connecting parts and the second connecting parts.

In an embodiment, after the step of folding the plurality of battery cells to each other in an accordion manner at the connection, the method further includes the following steps:

connecting each first connecting part to one end of the circuit board;

connecting the second connecting portion to the other end of the circuit board.

In an embodiment, each of the first connection portion and the second connection portion is plugged with the circuit board.

In one embodiment, the battery module further includes: an outer frame accommodating each of the cells; the outer frame includes: the device comprises a frame body with an opening, a cover plate covering the opening of the frame body and two end plates arranged oppositely, wherein the two end plates are arranged at two ends of the frame body;

the method also comprises the following steps of folding the plurality of battery cores in an accordion folding manner at the connection;

installing the folded battery cells into the frame body, wherein the lugs at two ends of the battery cells respectively face to the two end plates;

covering the cover plate on the frame body;

connecting the tab connected to the tab of each cell with the end plate opposite to the tab where the tab is located;

and fixing the two end plates with the frame body and the cover plate.

Compared with the prior art, the battery cells are directly connected in series, the battery cells after being connected in series are tiled and unfolded, and the insulating layer is coated on the exposed part of the connection part of the battery cells, so that the connection of the battery cells is not limited by the obstruction of a bus bar, two adjacent battery cells can be directly connected in series, the operation space is large, and the bus bar cannot be used for drying and pre-operation conveniently. And simple structure, spare part is less, has also reduced the assembly degree of difficulty and equipment cost. And when the insulating layer is coated, no bus bar is shielded, the insulating layer can be coated on the exposed part of each electric core connecting part, the coating is more comprehensive, and the use is safer.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.

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

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

fig. 3 is a schematic structural diagram of a cell stack array according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of each cell in a tiled, unfolded and series connection in an embodiment of the present invention;

FIG. 5 is a schematic view of an embodiment of the present invention in which an insulating layer is coated on the outside of a nickel plate;

fig. 6 is a flowchart illustrating an assembly method of a battery module according to an embodiment of the present invention;

100, a battery module; 10. arranging the battery cells; 7. an outer frame; 71. a frame body; 70. an opening; 74. a cover plate; 80. a circuit module; 8. a circuit board; 81. a plate body; 82. a first butt end; 83. a second butt joint end; 50. an insulating layer; 72. an end plate; 73. an end plate; 1. an electric core; 11. a tab; 12. a tab; 2. an electric core; 21. a tab; 22. a tab; 3. an electric core; 31. a tab; 32. a tab; 4. an electric core; 41. a tab; 42. a tab; 51. a tablet; 52. a tablet; 53. a tablet; 54. a tablet; 55. a tablet; 61. a first connection portion; 62. a first connection portion; 63. a first connection portion; 64. a second connecting portion; 65. a second connecting portion; 601. a nickel sheet; 602. a connecting wire; 9. and a locking member.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.

In the following description, for the purposes of illustrating various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details. In other instances, well-known devices, structures and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

Throughout the specification and claims, the word "comprise" and variations thereof, such as "comprises" and "comprising," are to be understood as an open, inclusive meaning, i.e., as being interpreted to mean "including, but not limited to," unless the context requires otherwise.

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings in order to more clearly understand the objects, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

As used in this specification and the appended claims, the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and/or" unless the context clearly dictates otherwise.

In the following description, for the purposes of clearly illustrating the structure and operation of the present invention, directional terms will be used, but terms such as "front", "rear", "left", "right", "outer", "inner", "outer", "inward", "upper", "lower", etc. should be construed as words of convenience and should not be construed as limiting terms.

Embodiments of the present invention are described below with reference to the drawings. As shown in fig. 1, 2, 3 and 4, the battery module 100 includes: the battery pack comprises an outer frame 7 and a battery cell array 10 arranged in the outer frame 7. The cell group column 10 includes: a plurality of electric cores of piling up the range in order, and two electric cores that arbitrary adjacent are established ties mutually. As shown in the figure, four electric cores are unfolded and arranged in order, the adjacent lugs of two adjacent electric cores are adjacent, if the lug 12 of the electric core 1 is adjacent to the lug 21 of the electric core 2, the electric core 1 and the electric core 2 are connected in series, and the electric core 2, the electric core 3 and the electric core 4 are connected in series in the same way. And the polarities of the two connected tabs are opposite. And each battery cell can be unfolded and tiled on the same horizontal plane.

In addition, as shown in fig. 2, 3 and 4, the two tabs connected to each other may be connected to each other by a tab. As shown in the drawing, the tab 12 is welded to one end of the tab 52, and the tab 21 is welded to the other end of the tab 52. The tabs of the other cells can be connected through the bus plates, and the tabs of the cells connected in series can also be directly connected. The sliver may be copper or aluminum.

Furthermore, the tab 11 of the electric core 1 and the tab 42 of the electric core 4 are also connected with a tab, that is, the tabs of all the electric cores are connected with the tab, and other components can be conveniently and electrically connected through the tab.

As shown in fig. 2 and fig. 3, the cell group column 10 further includes: circuit module 80, circuit module 80 can be used to gather the temperature, the electric current etc. of each electric core. The circuit module 80 can be electrically connected with the battery cells to be collected. The circuit module 80 includes: a circuit board 8, and a first connector and a second connector electrically connected to both ends of the circuit board 8, respectively. Because the data of each electric core need be gathered in battery module 100, connect first connecting piece and second connecting piece in the piece electricity of the ba piece electricity at electric core 1, electric core 2, electric core 3 and electric core 4 both ends respectively and connect.

Specifically, as shown in fig. 2, 3 and 4, the first connector has a plurality of first connection portions connected to one end of the circuit board 8, and the second connector has at least one second connection portion connected to the other end of the circuit board 8. In the present embodiment, there are 3 first connecting portions, 2 second connecting portions, the first connecting portion 61 connected to the blade 51, the second connecting portion 64 connected to the blade 52, the first connecting portion 62 connected to the blade 53, the second connecting portion 65 connected to the blade 54, and the first connecting portion 63 connected to the blade 55. The first connection portion 61, the first connection portion 62, and the first connection portion 63 are connected to one end of the circuit board 8, and the second connection portion 64 and the second connection portion 65 are connected to the other end of the circuit board 8. Thus, the first connection portion 61 and the second connection portion 64 can be electrically connected to the battery cell 1, the first connection portion 62 and the second connection portion 64 can be electrically connected to the battery cell 2, the first connection portion 62 and the second connection portion 65 can be electrically connected to the battery cell 3, and the first connection portion 63 and the second connection portion 65 can be electrically connected to the battery cell 4. Each of the first connection portion and the second connection portion may include a nickel plate 601 connected to the corresponding bar and a connection line 602 inserted into the circuit board 8, the connection line 602 is connected to the nickel plate 601, and the nickel plate 601 may be welded to the bar. It is understood that the first connection portion and the second connection portion may be integrally formed as a nickel plate or a connection wire. The number of the first connection portions and the second connection portions is not limited to the above number, and the number of the first connection portions and the second connection portions may be 1 or more.

Further, as shown in fig. 2, 3 and 4, the circuit board 8 includes: a plate body 81, a first butt end 82 and a second butt end 83 connected to two ends of the plate body 81 respectively; each of the first connectors is inserted into the first mating end 82, and each of the second connectors is inserted into the second mating end 83. Namely, each first connecting part of the first connecting piece is inserted into the first butt joint end 82, the first butt joint end 82 is provided with three first butt joint positions, and one first connecting part is inserted into one first butt joint position; each second connection portion of the second connection member is inserted into the second butt end 83, and the second butt end 83 has two second butt positions into which the second connection member is inserted.

In order to prevent the conductive property of the exposed metal portions of the tab, the first connecting portion, the second connecting portion, and the like of each cell, the insulating layer 50, such as insulating paint, insulating glue, and the like, is coated on the exposed metal portions of the tab, the first connecting portion, the second connecting portion, and the like of each cell. As shown in fig. 5, an insulating layer 50 is coated on the outer periphery of the nickel plate 601.

As shown in fig. 1, 2, 3, and 4, the outer frame 7 includes: the frame 71 has an opening 70, a cover plate 74 covering the opening 70 of the frame 71, and two

end plates

72 and 73 disposed opposite to each other and disposed at both ends of the frame 71. Each cell is placed in the frame 71, and the tabs at the two ends of the cell face the two end plates respectively. The pole piece connected to the pole ear of each cell is connected to the end plate opposite to the pole ear where the pole piece is located. The

lugs

51, 53 and 55 are locked to the corresponding end plate 72 by the locking members 9, and the

lugs

52 and 54 are locked to the corresponding end plate 73 by the locking members 9. The locking member 9 may be a bolt or a self-tapping screw, etc.

Fig. 6 shows an assembly method of a battery module, in which step 110 is performed first, and a plurality of battery cells are provided; in the present embodiment, taking 4 cells as an example, as shown in fig. 4, a cell 1, a cell 2, a cell 3, and a cell 4 are provided.

Next, step 120 is executed to connect the battery cells in series, so that the battery cells after being connected in series are sequentially laid and unfolded. In step 120, the tab of each cell is connected to the tab. The tab 51 may be welded to the tab 11 of the battery cell 1, and then one end of the tab 52 may be welded to the tab 12 of the battery cell 1 and the tab 21 of the battery cell 2, where the tab 12 of the battery cell 1 is different from the tab 21 of the battery cell 2. And welding other battery cells with corresponding bus plates in sequence, and finally welding the lug 42 of the battery cell 4 with the bus plate 55. In another embodiment, any one of the battery cells may be selected to be connected to the bus bar first, and the welding sequence is not limited.

In other embodiments, the cells connected in series may also be directly welded to the tabs of the two cells opposite to each other without being connected by the tabs.

In addition, as shown in fig. 4 and fig. 6, a step 150 is further included between step 120 and step 110, each battery cell is sequentially laid and unfolded, and the tabs of two adjacent battery cells with different polarities are opposite to each other. That is, each battery cell is tiled and unfolded in the state shown in the figure, the tabs of two adjacent battery cells are opposite, and step 120 is executed after each battery cell is arranged. In yet another embodiment, the battery cells may not be sequentially laid and unfolded, but the battery cells are connected in series and then the battery cells are laid and unfolded.

After step 120 is performed, step 130 is performed to electrically connect the first connecting member and the second connecting member to two ends of at least one battery cell, respectively. Specifically, the first connecting piece and the second connecting piece can be welded to two ends of one battery cell, and can also be welded to two ends of a plurality of battery cells.

Step 130 specifically includes:

and 131, connecting each first connecting part with the corresponding bus piece connected with one electrode lug of the battery cell.

And 132, connecting each second connecting part with the corresponding bus piece connected with the other electrode lug of the battery cell.

In one embodiment, the first connecting portion 61 is welded to the leg 51, the first connecting portion 62 is welded to the leg 53, and the first connecting portion 63 is welded to the leg 55 in this order. The second connecting portion 64 is welded to the leg 52, and the second connecting portion 65 is welded to the leg 54. One of the first connecting parts can be welded with the bus bar sheet at will, and the same is true for the second connecting parts. In addition, the second connecting part can be welded first, and then the first connecting part can be welded.

In another embodiment, the first connecting portion 61, the second connecting portion 64, the first connecting portion 62, the second connecting portion 65, and the first connecting portion 63 may be welded to the leg piece 51, the leg piece 52, the leg piece 53, the leg piece 54, and the leg piece 55, respectively. Other orders of welding the first connecting part and the second connecting part with the corresponding fins can be selected.

Then, step 140 is executed to coat the insulating layer on the exposed metal part of the connection part of each electric core which is spread and spread. In order to use safely and prevent electric leakage and short circuit, the metal parts of the lugs, the first connecting piece, the second connecting piece and the bus sheet of each battery cell exposed outside are coated with insulating layers. The spread battery cell array has two side surfaces, one side surface can be sprayed with an insulating layer, then the battery cell array is turned over and coated on the other side surface, or the spread battery cell array can be erected, and the insulating layer is directly coated on the two sides of the battery cell array. After the insulating layer is applied and the insulating layer is dried, step 150 is performed to fold the plurality of cells in an accordion-folded manner at the junctions. Namely, the tabs of the folded battery cells with the same polarity are positioned on the same side.

Next, in step 160, each first connection portion is connected to one end of the circuit board 8.

In step 170, the second connection portion is connected to the other end of the circuit board 8.

In one embodiment, each first connecting portion is inserted into the corresponding first mating end, and each second connecting portion is inserted into the corresponding first mating end, and the insertion order of the first connecting portion and the second connecting portion can be partially front and back. After the first connecting portion and the second connecting portion are inserted, the board body of the circuit board 8 is located on the upper surface of the cell group column.

Next, in step 180, the plurality of cells folded and connected to the circuit module are mounted in the frame 71, and the tabs at the two ends of the cells are respectively directed to the two

end plates

72 and 73. It is understood that the circuit board may be connected to the first connection portion or the second connection portion after the plurality of battery cells are folded and placed in the frame 71.

In step 190, the cover plate 74 is placed on the frame 71, and the cover plate 74 and the frame 71 are welded.

In step 200, the tab connected to the tab of each cell is connected to the end plate opposite to the tab where the tab is located.

In one embodiment, the

webs

51, 53, 55 and the end plate 72 are riveted together, and the end plate 73 is riveted together with the

webs

52, 54, without a bus bar support, for ease of installation.

In step 210, the two

end plates

72 and 73 are secured to the frame 71 and the cover plate 74.

End plates

72 and 73 may not be welded in sequence.

In addition, the above is only an example of 4 battery cells, and the number of the battery cells in different embodiments may be not more than 4, and may be 2, 3, or 5.

The steps of the above methods are divided for clarity, and it is within the scope of the present patent to combine the steps into one step or to split some steps into multiple steps when implementing the methods, as long as the same logical relationship is included.

While the preferred embodiments of the present invention have been described in detail above, it should be understood that aspects of the embodiments can be modified, if necessary, to employ aspects, features and concepts of the various patents, applications and publications to provide yet further embodiments.

These and other changes can be made to the embodiments in light of the above detailed description. In general, in the claims, the terms used should not be construed to be limited to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which such claims are entitled.

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.

Claims

1. An assembling method of a battery module, comprising:

providing a plurality of battery cells;

2. The method for assembling a battery module according to claim 1, wherein the step of providing a plurality of cells and the step of connecting the cells in series includes:

3. The method for assembling a battery module according to claim 2, wherein the step of connecting the cells in series comprises:

4. The assembly method of the battery module according to claim 2, wherein the step of connecting the tab of each of the cells to the tab includes:

5. The assembly method of a battery module according to claim 3, wherein the circuit module of the battery module includes: the circuit board comprises a circuit board, a first connecting piece and a second connecting piece, wherein the first connecting piece and the second connecting piece are electrically connected with two ends of the circuit board respectively; before the step of coating the insulating layer on the metal part of each cell connecting part exposed outside, the method comprises the following steps:

6. The method of assembling a battery module according to claim 5, wherein the first connector has a plurality of first connecting portions connected to one end of the circuit board; the second connecting piece is provided with at least one second connecting part connected with the other end of the circuit board; the step of electrically connecting the first connecting piece and the second connecting piece with two ends of at least one battery cell respectively specifically includes:

7. The method of assembling a battery module according to claim 6, wherein, before the step of folding the plurality of cells over each other in an accordion-folded manner at the connections, the step of coating the insulating layer with a metal portion that exposes each cell connection includes:

8. The assembly method of a battery module according to claim 7, further comprising, after the step of folding the plurality of cells in an accordion-folded manner to each other at the connection, the step of:

connecting each first connecting part to one end of the circuit board;

connecting the second connecting portion to the other end of the circuit board.

9. The method of assembling a battery module according to claim 8, wherein each of the first and second connecting parts is inserted into the circuit board.

10. The method of assembling a battery module according to claim 2, wherein the battery module further comprises: an outer frame accommodating each of the cells; the outer frame includes: the device comprises a frame body with an opening, a cover plate covering the opening of the frame body and two end plates arranged oppositely, wherein the two end plates are arranged at two ends of the frame body;

covering the cover plate on the frame body;

and fixing the two end plates with the frame body and the cover plate.