CN212874608U

CN212874608U - Flexible package battery module structure

Info

Publication number: CN212874608U
Application number: CN202022103042.1U
Authority: CN
Inventors: 娄豫皖; 和祥运
Original assignee: Shanghai Xuandai Technology Co ltd
Current assignee: Shanghai Xuandai Technology Co ltd
Priority date: 2020-09-23
Filing date: 2020-09-23
Publication date: 2021-04-02
Anticipated expiration: 2030-09-23

Abstract

The application relates to a flexible package battery module structure, which belongs to the technical field of secondary batteries. The application discloses flexible package battery module structure includes: the battery pack is composed of 2 or more soft package battery cores which are only packaged by polypropylene films, a cuboid aluminum shell with a special-shaped section and deformation resistance, two end plates and 2 or more magic adhesive rings for fixing the soft package battery modules; the electric core group sets up in the cuboid aluminum hull, two end plates follow the upper portion and the bottom of electric core group with the terminal surface of cuboid aluminum hull links together to form flexible package battery module, through the magic is pasted the circle and is fixed together with 2 or above flexible package battery module. This application greatly reduces electric core BOM cost, avoids the insulating bad problem of aluminium lamination. The problem of the reliability of sealing in the using process of the flexible package battery is solved; the problem of circulating water-jumping caused by deformation of the battery cell after circulation is effectively reduced; the problem of originally adopting structural adhesive to dismantle and destroy the battery is solved.

Description

Flexible package battery module structure

Technical Field

The application relates to a flexible package battery module structure, which belongs to the technical field of secondary batteries.

Background

The lithium ion battery is gradually widely applied to new energy automobiles as an electrochemical power supply with high specific energy. However, the cost of the battery system of the high enterprise becomes a pain point for restricting the development of the new energy automobile industry. At present, the main technical routes of lithium ion power batteries include a flexible package battery structure and a manufacturing process thereof, a square aluminum shell structure and a manufacturing process thereof, and a cylindrical metal shell structure and a manufacturing process thereof. When the three batteries are applied to an automobile, the batteries need to be combined into a battery module and a battery pack, although the soft-packaged batteries are packaged by the aluminum plastic films, the difficulty in manufacturing process realization is small, the first pass rate is high, the reliability that the pain point is sealing is questioned, and due to the fact that the aluminum plastic films are used for external packaging, the insulation is poor by about 0.2% due to the fact that the aluminum plastic films are overheated to be sealed, and the batteries need to be supported by an external protection structure in grouping and fixing processes, so that the use cost is high. The square aluminum shell battery cell is packaged by adopting an aluminum metal shell relative to a soft package battery cell, so that the problem of sealing reliability of a soft package is solved, but the processes of formation, secondary liquid supplement, sealing and the like are complex to realize, and the straight-through rate is lower than that of packaging. On the other hand, in the echelon use of the soft-pack battery or the aluminum square battery, since the prestress in the thickness direction is released after the battery pack is removed and the battery is expanded, the cycle life of the echelon use is lost by the water jump.

In addition, no matter be square, laminate polymer battery, blade battery of aluminum hull and big module structure at present, the fixed of battery is glued with the structure and is pasted, disassembles almost all can destroy the battery when the echelon is utilized for the echelon utilization ratio of battery reduces.

The application of the current flexible package battery cell also needs to be protected by a metal outer cover after the battery cell is connected in series and in parallel; or each soft package cell is protected by an outer supporting piece and then connected in series and in parallel to form a module. On the one hand, the cost of electric core plastic-aluminum membrane packing is high, and on the other hand, the support piece of outside protection soft-packing electric core is not few. Namely the sum of the packaging cost of the battery cell and the cost of the external protection piece of the flexible packaging battery cell. The overwrap support only serves a protective function, but the sealing reliability against the electrolyte also depends on the sealing of the aluminum plastic film.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, in view of the soft package and square pain point problems, the application combines the process of the soft package battery, replaces the aluminum plastic film which has higher cost and needs to be imported with the polypropylene film, and packages the aluminum plastic film into the battery cell by adopting the packaging process of the square structure, and the inside of the battery cell can be connected in series and in parallel to form a module. On one hand, the assembly cost of using the aluminum plastic film and forming the module is saved, and meanwhile, double insurance is added to the sealing performance of the battery, so that the sealing reliability is improved; the process is simplified and the cost is saved when the battery pack is formed; and because the aluminum profile anti-deformation special shape of the outer package has an anti-deformation mechanical structure, the problem of battery life diving during echelon utilization is solved, and meanwhile, the scheme adopts the magic tape for fixation, so that the battery can be effectively protected to facilitate echelon utilization.

The application provides a soft-packing battery module structure, include: the battery pack is composed of 2 or more soft package battery cores which are only packaged by polypropylene films, a cuboid aluminum shell with a special-shaped section and deformation resistance, two end plates and 2 or more magic adhesive rings for fixing the soft package battery modules; the electricity core group sets up in the cuboid aluminum hull, two end plates follow the left part and the right part of electricity core group with the terminal surface of cuboid aluminum hull links together to form flexible packaging battery module, through the magic is pasted the circle and is fixed together with 2 or above flexible packaging battery module.

In addition, in above-mentioned flexible package battery module structure, 2 or more soft-packaged electrical core's positive and negative pole ear are directly connected in parallel through the welding of ultrasonic bonding's mode welding together, and the positive and negative poles of different parallelly connected combinations are directly connected in series through the welding of welded mode welding together, have the voltage sampling line of drawing forth on the positive and negative poles that establish ties, place the fire prevention foam between the soft-packaged electrical core to constitute many parallel many strings of electric core group.

On the other hand, the positive and negative electrode lugs of the soft package battery cell of the soft package battery module structure are respectively connected with the positive and negative output terminals on the end plate in a welding manner, and the voltage sampling lines are respectively connected with the sampling output terminals on the end plate in a welding manner; the end plate is connected to the end face of the aluminum shell in a welding mode and sealed, and the end plate is provided with an explosion-proof valve device. And heat-conducting glue filled between the bottom of the electric core group and the aluminum shell.

In yet another aspect. Among the above-mentioned soft-packing battery module structure, the magic is pasted the circle and is separated the certain distance or overlap alternately on soft-packing battery module in soft-packing battery module length direction, fixes between the soft-packing battery module on the one hand, and on the other hand, pastes the bonding with the magic of fixing on the battery package bottom plate in the bottom and is in the same place. The connection mode of the anode and the cathode among the flexible package battery modules is detachable bolt connection. The flexibly packaged battery modules are closely arranged together, are engaged in a shape matching manner and are fixed by a magic tape in an adhering manner or are adhered by a magic tape on an insulating piece with a shape matching with the shape of the battery module shell; the bottom of the flexible package battery module is adhered and fixed with the magic tape fixed on the bottom plate of the battery pack through the magic tape. The cross section of the aluminum shell is in the shape of an anti-deformation arc or a combination of a plurality of arcs.

In another aspect, in the above structure of the flexibly packaged battery module, an insulating member is disposed between the flexibly packaged battery modules, and a hook and loop fastener is fixed on the insulating member. The soft-packing battery module has the connection copper bar of connecting positive negative pole, and the magic is pasted the circle around the module, fixes magic subsides on the battery box and pastes with the magic on the soft-packing battery module and paste together, and magic subsides on the soft-packing battery module and the magic subsides on the insulating member are pasted, install in proper order, form wholly.

The application has the following technical effects and advantages:

1. the outer packaging aluminum plastic film of the soft packaging cell is replaced by a cheap polypropylene film (the inner layer of the aluminum plastic film is a polypropylene film layer), the polypropylene film is prepared by co-extruding polypropylene particles to form a sheet and stretching the sheet in longitudinal and transverse directions, and the polypropylene film is a known material and is generally a biaxially oriented polypropylene film (BOPP). The BOM cost of the battery cell is greatly reduced, and meanwhile, the problem of poor insulation between the shell and the aluminum layer of the cathode lug and the aluminum-plastic film caused by the use of the aluminum-plastic film is also avoided. 2. The packaging technology of the aluminum shell square battery core is adopted, so that the problem of sealing reliability in the use process of the flexible package battery is solved; 3. the aluminum alloy extrusion shell with the special-shaped cross section is adopted, so that the problem of circulating water jumping caused by deformation of the battery cell after circulation is effectively solved; 4. Adopt the fixed module of magic subsides to have solved the former problem of adopting the structural adhesive to dismantle and destroy the battery.

The packaging material of electric core replaces the aluminium-plastic membrane of very high price position by low price polypropylene film in this application, and outside support piece changes the aluminum hull into to the soft-packing electric core of series-parallel connection seals within the aluminum hull, has twice insurance (one polypropylene film, one aluminum hull) to the sealed of electrolyte, and simultaneously, overall cost has reduced.

The aluminum shell interface adopts the deformation-resistant shape, so that the whole appearance of a single module is ensured to be unchanged after the whole vehicle is used, and the problem of the recycled water-jumping with the service life caused by the expansion of the battery after the existing battery is decommissioned and disassembled is solved;

the module is fixed by the magic tape, so that the module can be conveniently dismounted and replaced without damage; in the prior art, the structure is mostly adopted for adhesion, so that the assembly is not convenient to disassemble without damage.

Drawings

Fig. 1(1) is a front view of a 2-to-3-string flexible package battery cell and a module structure thereof according to the present application.

Fig. 1(2) is a top view of a 2-to-3-string flexible package battery cell and a module structure thereof according to the present application.

Fig. 1(3) is a bottom view of a 2-to-3-string flexible package battery cell and a module structure thereof according to the present application.

Fig. 2 is a plan view of a cell bottom of the present application.

Fig. 3 is a side view of an end plate of a 2-in-2-string configuration of the present application.

Fig. 4 is a plan view of an aluminum shell interface of the present application.

Fig. 5(1) is a schematic diagram of a method for forming a battery pack according to the structure of the present application.

Fig. 5(2) is a partial structural view of a method for composing a battery pack with the structure of the present application.

Detailed Description

The following detailed description of embodiments of the present application refers to the accompanying drawings. The following examples are intended to illustrate the present application but are not intended to limit the scope of the present application.

In the attached drawing, 1 is the voltage sampling terminal, 2 is negative pole binding post, 3 is the negative pole end plate, 4 are the bubble cotton, 5 are electric core, 6 are aluminum hull (body), 7 are anodal end plate, 8 are second sampling terminal, 9 are anodal terminal, 10 are explosion-proof structure, 11 are the module, 12 are the sampling pencil, 13 are insulating member, 14 are connecting the copper bar, 15 are the magic subsides circle, 16 are the magic subsides, 17 are the liquid cooling board, 18 are heat-conducting glue layer, 19 and 4 indicate to be same bubble cotton.

The overall technical scheme of the application is as follows: the plastic-aluminum composite material is characterized by comprising 2 or more soft package battery cell combinations with polypropylene films replacing aluminum plastic films, a rectangular aluminum shell with a special-shaped section and deformation resistance, two end plates and 2 or more magic adhesive rings for fixing modules; the polypropylene film is used for replacing the aluminum plastic film adopted by the traditional flexible package battery cell to form, and the structure and the manufacturing technology of the traditional flexible package battery cell are completely adopted. The positive and negative lugs of 2 or more cells are directly ultrasonically welded together for parallel connection, then the positive and negative lugs of different parallel combinations are directly welded together for series connection and lead out a sampling line, and fireproof foam is placed between the positive and negative lugs to form a plurality of parallel and serial cell combinations; the formed electric core group is placed in a rectangular aluminum shell, positive and negative lugs are respectively welded and connected with positive and negative output terminals on an end plate, and voltage sampling wires are respectively welded with sampling output terminals on the end plate; then, the end plate is welded to the end face of the aluminum shell and sealed, wherein the end plate is provided with the explosion-proof valve device. The bottom of electric core group has heat conduction glue with the aluminum hull to fill, plays the heat conduction of producing electric core to the aluminum hull on, can conveniently dispel the heat. At length direction upper spacing certain distance, the magic is pasted the circle in turn to sheathe in, and its effect can be fixed between the module on the one hand, and on the other hand can be in the same place with the bottom plate of battery package is fixed in the bottom. The connection mode of the positive electrode and the negative electrode between the modules is that the modules are connected by bolts and can be disassembled; the modules are squeezed tightly, and the shapes of the modules are matched and engaged and are fixed by a magic tape; the bottom of the module is also adhered and fixed with the bottom plate of the battery pack through a magic tape. The cross-sectional shape of the metal shell is an arc shape or a combination of a plurality of arc shapes which resist deformation.

Fig. 1(1) is a front view of a 2-to-3-string flexible package battery cell and a module structure thereof according to the present application. Fig. 1(2) is a top view of a 2-to-3-string flexible package battery cell and a module structure thereof according to the present application. Fig. 1(3) is a bottom view of a 2-to-3-string flexible package battery cell and a module structure thereof according to the present application. Fig. 1(1) to fig. 1(3) show a 2-to-3-string flexible package battery cell and a module structure thereof. The negative terminal plate 3 is provided with a voltage sampling terminal 1, a wire connecting wire (not shown) connected with the voltage sampling terminal, a negative terminal 2 and a conducting strip connected with the battery core. An insulation structure (the structure of the insulation structure is not shown and can refer to a square aluminum shell) is arranged between the negative terminal 2 and the sampling terminal 1 and the end plate 3, the fireproof foam 4 or 19 which absorbs expansion of the battery core in the charging and discharging process is arranged between the battery cores 5, the cross section of the aluminum shell 6 is an arc-shaped combination with deformation resistance, and the aluminum can be extruded and is welded with the negative end plate 3 and the positive end plate 7 together by laser; the end plate 7 is provided with a positive terminal 9 and a metal sheet connected with the battery cell 5, a second sampling terminal 8 and a connecting wire connected with the battery cell 5. In addition, the end plate 3 and the end plate 7 are both provided with an explosion-proof structure 10.

In addition, fig. 2 is a plan view of a bottom of the battery cell of the present application. As shown in fig. 2, the bottom of the battery cell 5 is in contact with the aluminum casing 6 through the heat conductive adhesive layer 18, so as to perform a heat dissipation function.

Figure 3 shows a side view of the end plate in a 2-in-2-string configuration. The structure is similar to the 2-in-3-string structure, except that the positive and negative terminals 2, 9 are on the same side end plate as shown in fig. 3. While the other end plate may omit the terminals and sampling terminals. But the explosion proof structure 10 remains.

Fig. 4 is a plan view of an aluminum shell interface of the present application. As shown in fig. 4, it is shown that the aluminum shell interface may also be such an arrangement.

Fig. 5(1) is a schematic diagram of a method for forming a battery pack according to the structure of the present application. Fig. 5(2) is a partial structural view of a method for composing a battery pack with the structure of the present application. Fig. 5(1) and 5(2) show methods for forming a battery pack using the structure of the present application. 11 is the module of this application, 12 is the sampling pencil of drawing from every module, 13 is the insulating member between module 11, is fixed with magic subsides (not drawn) on it, 14 is the connecting copper bar of positive negative pole 2, 9 is connected to the module, 15 is the magic circle of pasting around the module, 16 is the magic subsides of fixing on the battery box and with the magic subsides bonding on the module, 17 is liquid cooling board etc.. In addition, the magic tape on the module is pasted with the magic tape on the insulating component, and the installation is carried out in sequence to form a whole.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application.

Claims

1. A flexibly packaged battery module structure, characterized in that includes: the battery pack is composed of 2 or more soft package battery cores which are only packaged by polypropylene films, a cuboid aluminum shell with a special-shaped section and deformation resistance, two end plates and 2 or more magic adhesive rings for fixing the soft package battery modules; the electric core group sets up in the cuboid aluminum hull, two end plates follow the upper portion and the bottom of electric core group with the terminal surface of cuboid aluminum hull links together to form flexible package battery module, through the magic is pasted the circle and is fixed together with 2 or above flexible package battery module.

2. The flexibly packaged battery module structure of claim 1, wherein the positive and negative electrode tabs of 2 or more flexibly packaged cells are directly welded together in parallel by ultrasonic welding, the positive and negative electrodes of different parallel combinations are directly welded together in series by welding, the positive and negative electrodes of the series connection have a voltage sampling line led out, and fireproof foam is placed between the flexibly packaged cells to form a plurality of parallel and multi-string cell groups.

3. The flexibly packaged battery module structure of claim 2, wherein the positive and negative tabs of the flexibly packaged battery cell are respectively connected with the positive and negative output terminals on the end plate in a welding manner, and the voltage sampling lines are respectively connected with the sampling output terminals on the end plate in a welding manner; the end plate is connected to the end face of the aluminum shell in a welding mode and sealed, and the end plate is provided with an explosion-proof valve device.

4. The flexibly packaged battery module structure according to claim 1 or 2, wherein a heat conducting glue is filled between the bottom of the electric core pack and the aluminum shell.

5. The structure of the flexibly packaged battery module according to claim 1 or 2, wherein the Velcro loops are alternately sleeved on the flexibly packaged battery module at intervals in the length direction of the flexibly packaged battery module to fix the flexibly packaged battery module and fix the bottom of the flexibly packaged battery module with the bottom plate of the battery pack.

6. The structure of the flexibly packaged battery module according to claim 1 or 2, wherein the connection mode of the positive electrode and the negative electrode between the flexibly packaged battery modules is detachable bolt connection.

7. The structure of the flexibly packaged battery module according to claim 1 or 2, wherein the flexibly packaged battery modules are closely arranged together, are matched in shape and are engaged and fixed by a magic tape; the bottom of the flexible package battery module is adhered and fixed with the bottom plate of the battery pack through the magic tape.

8. The flexibly packaged battery module structure according to claim 1 or 2, wherein the cross-sectional shape of the aluminum case shell is an arc shape or a combination of arc shapes that resists deformation.

9. The structure of the flexibly packaged battery module according to claim 1 or 2, wherein an insulating member is arranged between the flexibly packaged battery modules, and a magic tape is fixed on the insulating member.

10. The structure of the battery module with flexible package according to claim 9, wherein the battery module with flexible package has a copper bar for connecting the positive and negative electrodes, the velcro ring surrounds the periphery of the battery module, the velcro tape fixed on the battery box is adhered to the velcro tape on the battery module with flexible package, and the velcro tape on the battery module with flexible package is adhered to the velcro tape on the insulating member, and the two are sequentially mounted to form a whole.