CN217903358U - Laminate polymer battery module and module thereof - Google Patents

Abstract

The application discloses laminate polymer battery module and module thereof, laminate polymer battery module includes the aluminum hull, the aluminum hull both ends have the opening, laminate polymer battery core group has been placed in the aluminum hull, laminate polymer battery core group is parallelly connected by two laminate polymer battery cores and forms, laminate polymer battery core has anodal utmost point ear and negative pole utmost point ear, the both ends of aluminum hull are provided with anodal end plate and negative pole end plate respectively, the aluminum hull is directly buckled the formation and need not weld by aluminum plate in this application, its simple structure just makes the degree of difficulty and with low costs, aluminum plate has certain clearance and both ends to have the opening in its end to end department after buckling, this clearance link up the shell body of aluminum hull along the aluminum hull axial, above-mentioned opening and clearance can play certain effect of alleviating when the laminate polymer battery core group that the aluminum hull inside set up takes place to expand.

Description

Laminate polymer battery module and module thereof

Technical Field

The application relates to the field of battery processing and manufacturing, in particular to a soft package battery module and a module thereof.

Background

As a driving energy, the lithium ion battery is widely applied to new energy vehicles and energy storage, and compared with cylindrical and square batteries, the soft-package battery has high specific energy and good safety and is favored by high-end vehicles and enterprises.

When battery module is constituteed to laminate polymer battery, for the production equipment, battery module's shell structure includes upper cover and lower casing usually, for the ease of the equipment, and upper cover and lower casing can be provided with concave-convex structure respectively and cooperate. However, the existing battery case structure inevitably has the following problems in practical application: firstly, the weldable depth of the existing battery shell structure at the matching part of the concave-convex structure is smaller than the integral wall thickness of the shell, so that the matching part has lower strength after welding and is the weakest position of the shell strength, thereby reducing the integral strength of the battery shell structure; secondly, receive the influence of manufacturing and equipment tolerance, the internal surface of upper cover and lower casing can produce the segment difference in concave-convex structure's cooperation department, and the sharp limit of this segment difference department probably extrudees electric core pole piece when electric core inflation, leads to electric core pole piece stress concentration to the life-span and the safety of battery have been reduced.

Therefore, there is a need for developing a pouch battery module and a module manufacturing process that have a simple structure, are low in cost, and facilitate stress release.

SUMMERY OF THE UTILITY MODEL

The application provides a laminate polymer battery module and module thereof has solved traditional battery case welded back bulk strength among the prior art and has reduced to and the problem of electric core pole piece stress concentration.

In order to solve the technical problem, the application provides a soft package battery module which comprises an aluminum shell, wherein openings are formed in two ends of the aluminum shell, a gap is formed in the side face of the aluminum shell, the gap extends to the other end along one end of the aluminum shell and penetrates through the outer side wall of the aluminum shell, a soft package battery core group is placed in the aluminum shell and formed by connecting two soft package battery cores in parallel, each soft package battery core comprises an anode tab and a cathode tab, and an anode end plate and a cathode end plate are respectively arranged at openings in two ends of the aluminum shell;

the positive end plate is provided with a first positive end plate protruding rib, a second positive end plate protruding rib and positive slotted holes, the number of the first positive end plate protruding ribs is two, the first positive end plate protruding ribs are respectively arranged on two sides of the positive end plate, the number of the second positive end plate protruding ribs is also two, the second positive end plate protruding ribs are respectively arranged on the inner side of the first positive end plate protruding ribs, voltage and temperature sampling lines are contained in grooves formed between the first positive end plate protruding ribs and the second positive end plate protruding ribs, the number of the positive slotted holes is two, the positive slotted holes are located between the two second positive end plate protruding ribs, the two positive slotted holes are arranged side by side, and a positive electrode tab penetrates through the positive slotted holes;

the protruding muscle of first negative pole end plate, the protruding muscle of second negative pole end plate and negative pole slotted hole are provided with respectively to negative pole end plate both sides, the protruding muscle of first negative pole end plate is two and sets up respectively the both sides of negative pole end plate, the protruding muscle of second negative pole end plate also is two and sets up respectively the inboard of the protruding muscle of first negative pole end plate, the protruding muscle of first negative pole end plate with the groove content that forms between the protruding muscle of second negative pole end plate has received voltage and temperature sampling line, the negative pole slotted hole is two, the negative pole slotted hole is located two just two between the protruding muscle of second negative pole end plate the negative pole slotted hole sets up side by side, negative pole utmost point ear passes the negative pole slotted hole sets up.

Preferably, the aluminum shell has a rectangular parallelepiped shape.

Preferably, both sides of the soft-packaged electric core group are filled with heat-conducting glue.

Preferably, an aluminum foil tape is arranged on the side wall of the outer side of the aluminum shell, and the aluminum foil tape covers the gap.

For solving above-mentioned technical problem, this application still provides a laminate polymer battery module that corresponds with laminate polymer battery module, including the aforesaid arbitrary one laminate polymer battery module, laminate polymer battery module is a plurality of, each laminate polymer battery module stacks in proper order and a plurality of laminate polymer battery module establishes ties in proper order together, laminate polymer battery module includes the protruding muscle of the anodal end plate of second and the protruding muscle of second negative pole end plate, the protruding muscle of second negative pole end plate with the protruding muscle of the anodal end plate of second is C shape.

Preferably, the soft package battery module comprises a positive end plate, a positive electrode tab, a negative end plate and a negative electrode tab, wherein a total positive bus bar is arranged on the positive end plate, two ends of the total positive bus bar are respectively clamped between two protruding ribs of the second positive end plate, two sides of the total positive bus bar are respectively connected with the two positive electrode tabs, and two ends of the total positive bus bar are respectively connected with two total positive output terminals; be provided with total negative confluence piece on the negative pole end plate, total negative confluence piece's both ends joint respectively in two between the protruding muscle of second negative pole end plate, total negative confluence piece's both sides respectively with two negative pole utmost point ear is connected, total negative confluence piece's both ends are connected with two total negative output terminal respectively.

Preferably, the total positive output terminal and the total positive bus bar sheet are made of aluminum alloy, and the total negative output terminal and the total negative bus bar sheet are made of copper.

Preferably, the contact surface of any two adjacent soft package battery modules is filled with heat insulation foam.

Compared with the prior art, the beneficial effects of the utility model are as follows:

1. the module structure can fix the soft package battery and improve the heat conduction performance of the battery, and the expansion stress of the soft package battery can be buffered through the opening aluminum shell structure.

2. The battery module can form a module as a square aluminum shell battery or be directly integrated into a battery system by CTP (cell-to-pack).

3. Simple structure and low cost.

Drawings

In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments are briefly described below, and it is obvious for those skilled in the art to obtain other drawings without making any inventive changes.

Fig. 1 is a production view of a battery module of the present application;

fig. 2 is a cross-sectional view of a battery module of the present application;

fig. 3 is a diagram of a pouch cell in a battery module of the present application;

fig. 4 is a diagram of a positive terminal plate of the battery module of the present application;

fig. 5 is a cross-sectional view of a positive terminal plate of the battery module of the present application;

fig. 6 is a view of the negative electrode end plate of the battery module of the present application;

fig. 7 is a cross-sectional view of a negative end plate of the battery module of the present application;

fig. 8 is a product view of a battery module according to the present application;

fig. 9 is a left side view of the battery module of the present application;

fig. 10 is a right side view of the battery module of the present application;

fig. 11 is a schematic view illustrating a total positive output terminal connection of the battery module of the present application;

fig. 12 is a schematic view illustrating the connection of the total negative output terminal of the battery module of the present application.

In the figure: the battery comprises a positive end plate 1, a first positive end plate protruding rib 1-1, a second positive end plate protruding rib 1-2, a positive slotted hole 1-3, an aluminum shell 2, a soft-package battery core group 3, a soft-package battery core 30, a positive electrode tab 30-1, a negative electrode tab 30-2, a negative end plate 4, a first negative end plate protruding rib 4-1, a second negative end plate protruding rib 4-2, a negative electrode slotted hole 4-3, heat conducting glue 5, an aluminum foil adhesive tape 6, a total positive output terminal 7, a total negative output terminal 8, a total positive bus bar 9, a total negative bus bar 10, heat-insulating foam 11 and a soft-package battery module 100.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings.

The present battery case structure can weld the degree of depth at concave-convex structure's cooperation department and be less than the whole wall thickness of shell, it is lower to lead to this cooperation to be in the intensity after the welding, thereby cause the whole intensity reduction of battery case structure and receive the influence of manufacturing with the equipment tolerance, battery case's upper cover and the internal surface of casing down can produce the segment difference in concave-convex structure's cooperation department, the sharp limit of this segment difference department can extrude electric core pole piece when electric core inflation, lead to electric core pole piece stress concentration, thereby the life-span and the safety of battery have been reduced.

The inventor is after discovering above-mentioned problem, through many times testing, thereby developed a laminate polymer battery module and module, and then solved above-mentioned problem, the inventor abandons the inherent thinking that traditional battery case made, change traditional battery module's structure, adjustment module manufacturing process, bend aluminum plate and make side open-ended aluminum hull, put into the opening aluminum hull with laminate polymer battery, laminate polymer battery core group passes through the aluminium foil sticky tape with aluminum pipe aluminum hull both ends and is connected, the side clearance department after two laminate polymer battery cores stack simultaneously fills the heat-conducting glue. The entire structure can fix the soft package battery and improve the heat-conducting property of the battery, and the expansion stress of the soft package battery can be buffered through the opening aluminum shell structure. Meanwhile, the battery module can be directly assembled into a module as a square aluminum shell battery or integrated into a battery system by CTP (cell-to-pack).

Specifically, please refer to fig. 1 to 12, fig. 1 is a product diagram of a battery module of the present application, fig. 2 is a sectional view of the battery module of the present application, fig. 3 is a diagram of a pouch cell in the battery module of the present application, fig. 4 is a diagram of a positive terminal plate of the battery module of the present application, fig. 5 is a sectional view of a positive terminal plate of the battery module of the present application, fig. 6 is a diagram of a negative terminal plate of the battery module of the present application, fig. 7 is a sectional view of a negative terminal plate of the battery module of the present application, fig. 8 is a product diagram of the battery module of the present application, fig. 9 is a left side view of the battery module of the present application, fig. 10 is a right side view of the battery module of the present application, fig. 11 is a schematic diagram of a connection of a total positive output terminal of the battery module of the present application, and fig. 12 is a schematic diagram of a connection of a total negative output terminal of the battery module of the present application.

Referring to fig. 1 to 7, a soft package battery module 100 includes an aluminum case 2, two ends of the aluminum case 2 have openings, a side surface of the aluminum case 2 has a gap, the gap extends from one end of the aluminum case 2 to the other end and penetrates through an outer side wall of the aluminum case 2, a soft package battery core group 3 is disposed in the aluminum case 2, the soft package battery core group 3 is formed by connecting two soft package battery cells 30 in parallel, each soft package battery cell 30 includes a positive electrode tab 30-1 and a negative electrode tab 30-2, and two end openings of the aluminum case 2 are respectively provided with a positive electrode end plate 1 and a negative electrode end plate 4; the positive end plate 1 is provided with first positive end plate protruding ribs 1-1, second positive end plate protruding ribs 1-2 and positive slotted holes 1-3, the number of the first positive end plate protruding ribs 1-1 is two, the first positive end plate protruding ribs are respectively arranged on two sides of the positive end plate 1, the number of the second positive end plate protruding ribs 1-2 is two, the second positive end plate protruding ribs are respectively arranged on the inner sides of the two first positive end plate protruding ribs, voltage and temperature sampling lines are contained in grooves formed between the first positive end plate protruding ribs 1-1 and the second positive end plate protruding ribs 1-2, the number of the positive slotted holes 1-3 is two, the positive slotted holes 1-3 are positioned between the two second positive end plate protruding ribs, the two positive slotted holes 1-3 are arranged side by side, and the positive electrode tabs 30-1 pass through the positive slotted holes 1-3; two sides of the negative end plate 4 are respectively provided with a first negative end plate protruding rib 4-1, a second negative end plate protruding rib 4-2 and a negative pole slotted hole 4-3, the number of the first negative end plate protruding ribs 4-1 is two and is respectively arranged on two sides of the negative end plate 4, the number of the second negative end plate protruding ribs 4-2 is two and is respectively arranged on the inner side of the first negative end plate protruding rib, a voltage and temperature sampling line is contained in a groove formed between the first negative end plate protruding rib 4-1 and the second negative end plate protruding rib 4-2, the number of the negative pole slotted holes 4-3 is two, the negative pole slotted hole 4-3 is positioned between the two second negative end plate protruding ribs and the two negative pole slotted holes 4-3 are arranged side by side, and the negative pole tab 30-2 passes through the negative pole slotted hole 4-3.

In this application embodiment the aluminum hull 2 is directly buckled by aluminum plate and is formed and do not need the welding, its simple structure and make the degree of difficulty and with low costs, and aluminum plate has certain clearance and both ends to have the opening in its end to end department after buckling, and this clearance extends to the shell body that the other end link up aluminum hull 2 along the one end of aluminum hull 2, and above-mentioned opening and clearance can play certain buffering effect when the inside soft packet of electric core group 3 that sets up of aluminum hull 2 takes place the inflation. For the convenience is the battery module with a plurality of battery module combinations, the shape of aluminum hull 2 can set up to the cuboid form, and two laminate polymer core 30 stack together and form laminate polymer core group 3, pack heat-conducting glue 5 in laminate polymer core group 3's both sides to derive laminate polymer core group 3's heat. In order to facilitate parallel connection, the positive electrode tabs 30-1 of each soft package battery cell 30 are placed on the same side; the positive end plate 1 and the negative end plate 4 are respectively placed at the two ends of the soft-package battery cell group 3, the positive lugs of the two soft-package battery cells 30 respectively penetrate out of the two positive slotted holes 1-3, the negative lugs 30-2 of the two soft-package battery cells 30 respectively penetrate out of the two negative slotted holes 4-3, the soft-package battery cell group 3 is placed into an aluminum shell, and the gaps at the interface of the aluminum shell can be adhered together by using an aluminum foil adhesive tape 6.

The above has been described in detail to the embodiment of a laminate polymer battery module 100, based on the laminate polymer battery module 100 that above-mentioned embodiment described, the embodiment of the utility model provides a laminate polymer battery module that corresponds with this laminate polymer battery module 100 is still provided. Since the embodiment of the module portion corresponds to the embodiment of the module portion, the embodiment of the module portion is described with reference to the embodiment of the module portion, and is not described herein again.

Referring to fig. 8-12, the pouch battery module includes a plurality of pouch battery modules 100, the plurality of pouch battery modules 100 are stacked in sequence, and the plurality of pouch battery modules 100 are connected in series in sequence, where the pouch battery module 100 includes a second positive end plate protruding rib 1-2, a second negative end plate protruding rib 4-2, and the positive end plate 1, the positive tab 30-1, the negative end plate 4, and the negative tab 30-2, and the second positive end plate protruding rib 1-2 and the second negative end plate protruding rib 4-2 are all C-shaped; a total positive bus bar sheet 9 can be arranged on the positive end plate 1 of the soft package battery module 100 positioned at the topmost part, two ends of the total positive bus bar sheet 9 are respectively clamped between the two second positive end plate protruding ribs 1-2, two sides of the total positive bus bar sheet 9 are respectively connected with two positive pole lugs 30-1, and two ends of the total positive bus bar sheet 9 are respectively connected with two total positive output terminals 7; the negative end plate 4 of one soft-package battery module 100 located at the bottommost part can be provided with a total negative bus bar piece 10, two ends of the total negative bus bar piece 10 are respectively clamped between two second negative end plate protruding ribs 4-2, two sides of the total negative bus bar piece 10 are respectively connected with two negative pole tabs 30-2, and two ends of the total negative bus bar piece 10 are respectively connected with two total negative output terminals 8.

Total positive output terminal 7 is the aluminum alloy with total positive confluence piece 9 material, and total negative output terminal 8 is copper with total negative confluence piece 10 material, and the contact surface of two laminate polymer battery modules is filled with thermal-insulated bubble cotton 11.

In the process of assembling the battery module into the battery module, the plurality of pouch battery modules 100 are stacked together, please refer to fig. 8, (four modules are shown in fig. 8) the positive terminals and the negative terminals of the plurality of pouch battery modules 100 are alternately arranged for convenient series connection. The plurality of pouch battery modules 100 are separated by heat insulation foam 11 to avoid overheating.

Referring to fig. 9, when modules are connected in series, the negative electrode tab 30-2 of the upper soft-package battery module 100 and the positive electrode tab 30-1 of the lower soft-package battery module 100 are bent in opposite directions in sequence to ensure that the positive electrode tab 30-1 is on the negative electrode tab 30-2, and after compression, the modules are welded together by laser to complete series connection.

Referring to fig. 10 and 11, when welding the positive electrode tab 30-1 and the total positive bus bar sheet 9, the positive electrode tab 30-1 of the pouch battery module 100 may be bent oppositely to the total positive bus bar sheet 9 and laser welded together. The total positive output terminal 7 is laser welded to the total positive bus bar 9. The total positive output terminal 7 and the total positive bus bar sheet are integrated, and can also be subjected to pre-welding processing. In the same way, when the negative electrode tab 30-2 and the total negative bus bar piece 10 are welded, the negative electrode tab 30-2 of the soft package battery module 100 can be oppositely bent onto the total negative bus bar piece 10 and welded together by laser. The total negative output terminal 8 is laser welded to the total negative bus bar 10.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice in the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope of the disclosure being indicated by the following claims.

It will be understood that the present application is not limited to the precise arrangements that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The above-described embodiments of the present application do not limit the scope of the present application.

Claims (8)

1. The soft package battery module is characterized by comprising an aluminum shell, wherein openings are formed in two ends of the aluminum shell, a gap is formed in the side face of the aluminum shell, the gap extends to the other end along one end of the aluminum shell and penetrates through the outer side wall of the aluminum shell, a soft package battery core group is placed in the aluminum shell and formed by connecting two soft package battery cores in parallel, each soft package battery core comprises an anode tab and a cathode tab, and an anode end plate and a cathode end plate are respectively arranged at openings in two ends of the aluminum shell;

the positive end plate is provided with a first positive end plate protruding rib, a second positive end plate protruding rib and a positive slotted hole, the number of the first positive end plate protruding ribs is two, the first positive end plate protruding ribs are respectively arranged on two sides of the positive end plate, the number of the second positive end plate protruding ribs is two, the second positive end plate protruding ribs are respectively arranged on the inner side of the first positive end plate protruding rib, voltage and temperature sampling lines are contained in a groove formed between the first positive end plate protruding rib and the second positive end plate protruding rib, the number of the positive slotted holes is two, the positive slotted hole is located between the two second positive end plate protruding ribs, the two positive slotted holes are arranged side by side, and a positive pole lug penetrates through the positive slotted hole;

be provided with the protruding muscle of first negative pole end plate, the protruding muscle of second negative pole end plate and negative pole slotted hole on the negative pole end plate, the protruding muscle of first negative pole end plate is two and sets up respectively the both sides of negative pole end plate, the protruding muscle of second negative pole end plate is two and sets up respectively the inboard of the protruding muscle of first negative pole end plate, the protruding muscle of first negative pole end plate with the groove content that forms between the protruding muscle of second negative pole end plate has accommodated voltage and temperature sampling line, the negative pole slotted hole is two, the negative pole slotted hole is located two between the protruding muscle of second negative pole end plate, two the negative pole slotted hole sets up side by side, negative pole utmost point ear passes the negative pole slotted hole sets up.

2. The pouch battery module as defined in claim 1 wherein the aluminum housing is rectangular parallelepiped in shape.

3. The pouch battery module according to claim 1, wherein both sides of the pouch battery core pack are filled with a thermally conductive glue.

4. The pouch battery module defined in claim 1 wherein aluminum foil tape is provided on the outer side wall of the aluminum housing, the aluminum foil tape covering the gap.

5. The utility model provides a laminate polymer battery module, its characterized in that includes claim 1-4 arbitrary laminate polymer battery module, laminate polymer battery module is a plurality of, each laminate polymer battery module stacks in proper order, and is a plurality of laminate polymer battery module establishes ties in proper order, laminate polymer battery module includes the protruding muscle of the anodal end plate of second, and the protruding muscle of second negative terminal plate, the protruding muscle of second negative terminal plate with the protruding muscle of the anodal end plate of second is C shape.

6. The soft package battery module according to claim 5, wherein the soft package battery module comprises a positive end plate, a positive electrode tab, a negative end plate and a negative electrode tab, a total positive bus bar is arranged on the positive end plate, two ends of the total positive bus bar are respectively clamped between two second positive end plate protruding ribs, two sides of the total positive bus bar are respectively connected with the two positive electrode tabs, and two ends of the total positive bus bar are respectively connected with a total positive output terminal;

be provided with total negative confluence piece on the negative pole end plate, total negative confluence piece's both ends joint respectively in two between the protruding muscle of second negative pole end plate, total negative confluence piece's both sides respectively with two negative pole utmost point ear is connected, total negative confluence piece's both ends are connected with total negative output terminal respectively.

7. The laminate battery module as recited in claim 6, wherein the total positive output terminal and the total positive bus bar are made of aluminum alloy, and the total negative output terminal and the total negative bus bar are made of copper.

8. The laminate polymer battery module according to claim 6, wherein a thermal insulation foam is filled between the contact surfaces of any two adjacent laminate polymer battery modules.

Images