CN210956727U

CN210956727U - Packaging material and soft package battery

Info

Publication number: CN210956727U
Application number: CN201720697767.3U
Authority: CN
Inventors: 不公告发明人
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-06-15
Filing date: 2017-06-15
Publication date: 2020-07-07
Anticipated expiration: 2027-06-15
Also published as: CN107521183A

Abstract

The utility model relates to an aluminum-plastic film for packing battery, in particular to be applied to laminate polymer battery packing in the automobile-used frostproofing coolant liquid and use aluminum-plastic film and laminate polymer battery. To the aluminum-plastic film that is used for packing the battery among the prior art is able to bear or endure the not enough defect of corrosion resistance of automobile-used frostproofing coolant liquid or resistant cooling water, the utility model particularly provides following battery is plastic-aluminum complex film solution for packing: the aluminum-plastic film comprises an aluminum foil layer and a plastic layer compounded on the surface of the aluminum foil layer; wherein, the aluminium foil layer is the individual layer, and the aluminium foil layer is formed by corrosion-resistant aluminum alloy. Or the aluminum-plastic film comprises an aluminum foil layer and a plastic layer compounded on the surface of the aluminum foil layer; wherein, the aluminium foil layer is the individual layer, and the aluminium foil layer is formed by corrosion-resistant pure aluminium. Or the aluminum-plastic film comprises an aluminum foil layer and a plastic layer compounded on the surface of the aluminum foil layer; the aluminum foil layer is a composite layer and comprises a core material and a skin material positioned on the outer side of the core material, and the corrosion potential of the skin material of the aluminum foil layer is lower than that of the core material.

Description

Packaging material and soft package battery

Technical Field

The utility model relates to a packaging material and laminate polymer battery for the battery, in particular to can be applied to packaging material and laminate polymer battery for the laminate polymer battery who soaks in the cooling water.

Background

In the prior art, an aluminum plastic film for packaging a soft package battery usually adopts an 8-series aluminum alloy aluminum foil which is a soft aluminum foil after annealing and has good deep drawing formability, but the aluminum foil has high iron content and poor anti-corrosion capability of an anti-freezing solution, and is not considered to be applied to an environment in direct contact with an automotive anti-freezing solution. The battery packed by the aluminum plastic film has insufficient corrosion resistance to the vehicle antifreeze, and if the battery packed by the aluminum plastic film is soaked in the antifreeze for a long time, the battery is at risk of corrosion and perforation. If the requirement of maintaining good performance after being soaked in the anti-freezing solution for a long time (such as 5 years or 10 years), a special anti-freezing solution aluminum-plastic film for resisting vehicles needs to be developed and an appropriate aluminum foil layer needs to be selected. Although the Chinese patent application CN102373499A describes that various aluminum alloys and plastics are combined, the aluminum alloys and the plastics are not films or foils and are not suitable for packaging soft package batteries.

SUMMERY OF THE UTILITY MODEL

To the automobile-used frostproofing coolant liquid of resistant car of aluminium-plastic film (being called as antifreeze for short, its essential component is ethylene glycol and water) or the not enough defect of corrosion resistance of resistant cooling water among the prior art for packing the battery, the utility model particularly provides following aluminium-plastic composite membrane (being called as aluminium-plastic film for short hereafter) solution for battery packing: the aluminum-plastic film comprises an aluminum foil layer and a plastic layer compounded on the surface of the aluminum foil layer; wherein, the aluminium foil layer is the individual layer, and the aluminium foil layer is formed by corrosion-resistant aluminum alloy.

Or the aluminum-plastic film comprises an aluminum foil layer and a plastic layer compounded on the surface of the aluminum foil layer; wherein, the aluminium foil layer is the individual layer, and the aluminium foil layer is formed by corrosion-resistant pure aluminium.

Or the aluminum-plastic film comprises an aluminum foil layer and a plastic layer compounded on the surface of the aluminum foil layer; the aluminum foil layer is a composite layer and comprises a core material and a skin material positioned on the outer side of the core material, and the corrosion potential of the skin material of the aluminum foil layer is lower than that of the core material.

The utility model discloses an aluminum plastic film is a plastic film and the film combined material that the aluminium foil membrane formed, is as polymer packaging material for the lithium cell.

The single surface of the aluminum foil layer is compounded with a plastic layer, or the two surfaces of the aluminum foil layer are both compounded with plastic layers. If the plastic layer is laminated on one side of the aluminum foil layer, it is preferably laminated on the inner side of the aluminum foil layer. Wherein, the above scheme includes the following conditions: the plastic layer compounded on one side of the aluminum foil layer can be single-layer plastic or multi-layer plastic.

Further, the inner plastic layer is preferably a thermoplastic resin film. Such as polypropylene (PP) film or Polyethylene (PE) film. The thickness of the inner plastic layer is preferably 50-300 microns, more preferably 100-200 microns, and even more preferably 150-200 microns. The inner plastic layer thus has better electrical insulation properties and thus a higher voltage resistance, such as a voltage resistance of preferably more than 1000V, more preferably more than 2000V.

Further, the outer plastic layer is preferably a heat-resistant resin film. Such as polyamide or nylon (PA) films, or Polyester (PET) films, or Polyimide (PI) films.

The composite layer aluminum alloy preferably includes at least a core material and a skin material compounded on the outer side of the core material. The composite layer aluminum alloy can be two-layer aluminum alloy or multi-layer aluminum alloy.

The utility model discloses above-mentioned plastic-aluminum membrane can be including any one structure in A) -D):

A) the aluminum plastic film comprises a laminated body consisting of an inner plastic heat sealing layer, an intermediate aluminum foil layer and an outer plastic protective layer, wherein the intermediate aluminum foil layer is made of an aluminum material with good corrosion resistance. The aluminum materials having good corrosion resistance include 1-series aluminum alloys, 3-series rust-proof aluminum and 5-series rust-proof aluminum.

B) The aluminum plastic film comprises a laminated body composed of an inner plastic heat sealing layer and an outer aluminum foil layer, wherein the outer aluminum foil layer is made of aluminum material with good corrosion resistance. The aluminum material having excellent corrosion resistance includes 3-series rustproof aluminum. The aluminum-plastic film does not contain an outer plastic protective layer.

C) The aluminum-plastic film is provided with a laminated body consisting of an inner plastic heat sealing layer, a middle aluminum foil layer and an outer plastic protective layer, wherein the middle aluminum foil layer is formed by a composite layer aluminum foil with a sacrificial anode protection function. For example, the composite aluminum foil is formed of a core material and a skin material having a corrosion potential lower than that of the core material.

D) The aluminum-plastic film is provided with a laminated body consisting of an inner plastic heat-sealing layer and an outer aluminum foil layer, wherein the outer aluminum foil layer is formed by a composite layer aluminum foil with a sacrificial anode protection function. The aluminum-plastic film does not contain an outer plastic protective layer.

The inner plastic heat-sealing layer may be referred to as a thermoplastic resin film layer, and the outer plastic protective layer may be referred to as a heat-resistant resin film layer.

Furthermore, the corrosion potential of the skin material is 50 mV-500 mV lower than that of the core material. Preferably, the corrosion potential of the skin material is 70mV to 200mV lower than that of the core material. More preferably, the corrosion potential of the skin material is 100mV to 170mV lower than the corrosion potential of the core material. In the present invention, if not specifically described, the corrosion potential refers to the corrosion potential in the coolant environment. Through the reasonable potential matching of the skin material and the core material in the composite aluminum foil, the pitting corrosion of the aluminum foil (particularly the core material) is avoided.

In the present invention, the cooling liquid is preferably a water-based cooling liquid unless otherwise specified. The water-based coolant is a coolant containing water as a basic component. The water-based coolant may also contain various antifreeze agents (such as ethanol, ethylene glycol, propylene glycol, etc.) to form an antifreeze liquid having an antifreeze function. Therefore, the cooling liquid of the present invention includes the following types: pure water, a mixed solution of ethylene glycol and water, and the like.

Or the aluminum-plastic film comprises an aluminum foil layer and a plastic layer compounded on the surface of the aluminum foil layer; wherein, the outside of the aluminum foil layer is covered with a metal zinc layer.

Furthermore, the core material of the composite aluminum foil layer is made of corrosion-resistant aluminum alloy or pure aluminum. The pure aluminum includes industrial pure aluminum and high-purity aluminum. The purity of aluminum in the pure aluminum is preferably more than 99.0%, and more preferably 99.0% -99.99%.

Corrosion resistant aluminum alloy, indicate under the environment with coolant liquid direct contact, aluminum alloy and plastic-aluminum membrane can keep normal function for a long time and do not become invalid, for example the aluminum alloy is not corroded the perforation by the coolant liquid. Wherein the "non-failure" includes that the electrical insulation function of the aluminum plastic film is not failed and the barrier function is not failed. Its performance, although somewhat attenuated, still meets the basic requirements. By "long-term" is meant the duration of the normal life cycle of a product (e.g., an automobile or automobile power battery), such as a product having a life of greater than 5 years, preferably greater than 10 years, and more preferably greater than 15 years. Corrosion resistant aluminum alloy, can select from rust-resistant aluminium or the aluminum alloy that has good corrosion resistance down: 1-series aluminum alloy, 3-series aluminum alloy, 5-series aluminum alloy, and 6-series aluminum alloy. Since the corrosion-resistant aluminum alloy (such as aluminum manganese alloy AA3003, and AA is omitted below) or pure aluminum has good coolant corrosion resistance, the aluminum alloy can be used as an aluminum foil layer of an aluminum-plastic film and can be applied to an application occasion in direct contact with a coolant.

If the aluminum foil layer is a composite layer, the aluminum foil layer is formed by compounding a core material and a skin material, the core material is positioned at the inner side, the skin material is positioned at the outer side, and the corrosion potential of the skin material is lower than (or negative to) that of the core material. When the aluminum foil is contacted with corrosive media, electrochemical corrosion is formed, the skin material is used as a sacrificial anode, and the core material used as a cathode is protected, so that the aluminum foil layer in the aluminum plastic film can resist corrosion of cooling liquid for a long time, and the service life of a battery is further ensured. The thickness of the skin material is preferably 8-20%, more preferably 10 +/-2% of the whole aluminum foil layer. The inner side of the utility model refers to the side close to the electrolyte in the battery core when the utility model is applied to the soft package battery; the outer side refers to the side far away from the electrolyte in the battery core when the battery is applied to a soft package battery.

The core material may be referred to as a base material. The plastic layer can be various plastic layers which are mature and applied in the prior art, for example, the inner layer adopts a casting polypropylene film (CPP), the outer layer adopts a nylon film (ON) or a polyimide film (PI), and the plastic layer and the aluminum foil layer can be bonded and compounded by adopting an adhesive in the prior art.

Further, the corrosion-resistant aluminum alloy is selected from aluminum-manganese-aluminum alloy, aluminum-magnesium-silicon-aluminum alloy, or aluminum-silicon-aluminum alloy. More preferably, the corrosion-resistant aluminum alloy is an aluminum-manganese-aluminum alloy, or an aluminum-magnesium-aluminum alloy.

Or, further, the corrosion resistant aluminum alloy is selected from a 3-series aluminum alloy, or a 1-series aluminum alloy, or a 5-series aluminum alloy, or a 6-series aluminum alloy, or an 8-series aluminum alloy, or a 4-series aluminum alloy. Or these aluminum alloys have good corrosion resistance. The corrosion-resistant aluminum alloy is more preferably a 3-series aluminum alloy, or a 1-series aluminum alloy, or a 5-series aluminum alloy, or a 6-series aluminum alloy.

The aluminum alloy of the utility model is named according to the corresponding standard of the American aluminum Association.

Further, if the aluminum foil layer is a composite layer, the skin material of the aluminum foil layer is selected from aluminum-zinc-aluminum alloy or aluminum-copper-aluminum alloy. The skin material of the aluminum foil layer is more preferably aluminum-zinc-aluminum alloy. The content of zinc element in the aluminum-zinc alloy is preferably 1-10%, and more preferably 4-7%.

Or, further, if the aluminum foil layer is a composite layer, the skin material of the aluminum foil layer is selected from 7 series aluminum alloy or 2 series aluminum alloy. The skin material is selected from 7 series or 2 series aluminum alloy with corrosion potential lower than that of the core material, such as 7072 aluminum alloy or Al clad 2024 aluminum alloy. The skin material of the aluminum foil layer is more preferably a 7-series aluminum alloy. For example, the corrosion potential of 3003 aluminum alloy is about-0.72V, the corrosion potential of 7072 aluminum alloy is about-0.88V, and the corrosion potential of 2024 aluminum alloy is about-0.83V. In addition, besides the basic model of 7072, other modified models of 7072 can be selected as the leather material.

Or, further, if the aluminum foil layer is a composite layer, the skin material of the aluminum foil layer is selected from modified aluminum alloy with zinc added. The leather material is preferably 1 series aluminum alloy added with zinc or 3 series aluminum alloy added with zinc, such as 3003 aluminum alloy modified type added with 1.0-2.5% of zinc by mass percentage. The 3003 potential with zinc added is reduced to about-0.82V to-0.88V, so that the potential of the core material is lower than that of the 3003. Or the leather material is preferably an aluminum alloy formed by adding zinc on the basis of 1-series aluminum alloy (pure aluminum), such as a1050 aluminum alloy modified type added with zinc with the mass percent of 4% -7%.

Furthermore, a plastic layer is compounded on one surface of the aluminum foil layer, or plastic layers are compounded on both surfaces of the aluminum foil layer. If the plastic layer is laminated on one side of the aluminum foil layer, it is preferably laminated on the inner side of the aluminum foil layer. Wherein, the above scheme includes the following conditions: the plastic layer compounded on one side of the aluminum foil layer can be single-layer plastic or multi-layer plastic.

Further, the corrosion-resistant aluminum alloy is preferably 3003 aluminum alloy, or 3004 aluminum alloy, or 3005 aluminum alloy, or 3105 aluminum alloy, or 3a21 aluminum alloy.

Further, the pure aluminum is 1050 aluminum alloy, or 1060 aluminum alloy, or 1070 aluminum alloy, or 1100 aluminum alloy.

Further, if the aluminum foil layer is a composite layer, the skin material of the aluminum foil layer is 7072 aluminum alloy or 7075 aluminum alloy.

The aluminium foil general indicate pure aluminium or the aluminum alloy for film form (or lamellar), so the utility model discloses the aluminium foil also can be said to be the aluminium membrane, the aluminium membrane within 200 microns can be selected to thickness, also can select 200~300 microns or 300~500 microns thick aluminium membrane. Or, further, the thickness of the aluminum foil layer in the aluminum plastic film is preferably 50-500 micrometers. The thickness is more preferably 100 to 300 μm. The thickness is more preferably 200 to 300 μm.

Or, further, the thickness of the aluminum foil layer in the aluminum plastic film is 30-50 micrometers, or 50-80 micrometers, or 80-100 micrometers, or 100-150 micrometers, or 150-200 micrometers, or 200-300 micrometers, or 300-500 micrometers.

Further, the outside of the aluminum foil layer is covered with a metal zinc layer. The zinc layer is preferably formed by a zinc-spraying process.

Or, further, the aluminum foil layer is a composite layer, the aluminum foil layer comprises a core material and a skin material, the core material is aluminum alloy, and the skin material is a metal zinc layer.

Further, the outer part of the aluminum foil layer is bonded with a plastic protective layer through a release agent. So that the plastic protective layer outside the aluminum foil layer is easily separated.

Further, the heat sealing layer material can be a polypropylene (PP) film and also can be a Polyethylene (PE) film.

Further, the plastic protective layer may be made of nylon (ON) film or Polyester (PET) film.

The technical scheme comprises the following technical scheme: if the aluminum foil layer of the aluminum-plastic film is a single layer (non-composite layer), the aluminum foil layer may be a 3-series aluminum alloy, or a 1-series aluminum alloy, or a 5-series aluminum alloy, or a 6-series aluminum alloy. If the aluminum foil layer of the aluminum-plastic film is a composite layer, the core material of the aluminum foil layer can be 3 series aluminum alloy, or 1 series aluminum alloy, or 5 series aluminum alloy, or 6 series aluminum alloy, or 8 series aluminum alloy; the skin material of the aluminum foil layer can be 7 series aluminum alloy or 2 series aluminum alloy.

The utility model discloses the aluminium foil layer corrosion resistance of the above aluminium-plastic membrane that provides is good, and aluminium foil layer and the aluminium-plastic membrane that contains this aluminium foil layer have long-term resistant coolant liquid corrosion resistance.

The utility model discloses the plastic-aluminum membrane that provides more than, for example the aluminium foil layer has adopted 3 to be the aluminum alloy (like 3003), has adopted 3 to be the aluminum alloy and 7 to be the compound aluminum alloy composite bed of aluminum alloy (like 3003/7072) more preferably, so it has good resistant coolant liquid corrosion behavior, can be applied to among the automobile-used soft packet of power battery system to can let laminate polymer battery's plastic-aluminum membrane and coolant liquid direct contact heat transfer.

From another perspective, the aluminum plastic film for battery packaging of the present invention can also be expressed as follows, that is

An aluminum-plastic film for packaging a battery, comprising an aluminum foil as a water-blocking layer, the aluminum foil having the following coolant corrosion resistance:

the corrosion resistance test method is an OY aqueous Solution (OYama Water Solution) corrosion experiment;

the corrosion resistance life of the aluminum foil under the environment is more than 500 hours.

Furthermore, the corrosion resistance service life of the aluminum foil is more than 1000 hours. Further, the corrosion life of the aluminum foil is greater than 2000 hours.

Or, the aluminum-plastic film for packaging the battery comprises an aluminum foil as a water-resistant layer and a thermoplastic resin film compounded on the aluminum foil, wherein the aluminum foil has the following performance of resisting the corrosion of the cooling liquid:

the corrosion resistance test method comprises the following steps: OY aqueous corrosion test, or internal corrosion resistance test in ASTM D2570 standard;

Alternatively, and as described from a vehicle application perspective, it is preferred that the aluminum plastic film or aluminum foil thereof has a life of greater than 5 years, preferably greater than 10 years, and more preferably greater than 15 years, against corrosion by cooling fluids, such as antifreeze fluids consisting primarily of ethylene glycol and water.

The term "life" refers to the failure of the aluminum-plastic film and its aluminum foil to exhibit corrosion perforation during the life. The utility model discloses a obtain above-mentioned resistant coolant liquid corrosion behavior, above-mentioned suitable aluminium alloy material and sufficient thickness need be chooseed for use to the aluminium foil in the plastic-aluminum membrane. For example, the aluminum plastic film is preferably composed of an aluminum foil layer and a thermoplastic resin film compounded on the aluminum foil, wherein the aluminum foil is a composite layer aluminum foil with a sacrificial anode function, and the thickness is preferably 100 to 300 micrometers. The existing aluminum-plastic film product does not consider the application of soaking in the antifreeze solution, and also does not have the function of not losing efficacy after being soaked in the antifreeze solution for a long time; and the aluminum plastic film product of the utility model has the special characteristics.

Furthermore, the aluminum plastic film or the aluminum foil thereof also has deep drawability or formability. Or the aluminum plastic film or the aluminum foil thereof also has good deep drawability or formability. Or the aluminum-plastic film also has good deep-drawing formability. Or the aluminum plastic film or the aluminum foil thereof also has good cupping value. Since the deep drawability can be measured in cup-burst value. For example, the depth of punch or cupping value of the aluminum foil in the aluminum plastic film or the aluminum plastic film is greater than 5 mm, preferably greater than 10 mm, and more preferably greater than 12 mm, as tested by the GB/T4156-2007 Erichsen cupping test for thin metal sheets and strips. The punching depth value or the cupping value refers to that the aluminum plastic film or the aluminum foil thereof cannot be perforated after punching within the punching depth value or after cupping test.

If the aluminum foil is a single-layer aluminum alloy, further, the aluminum foil is a 1-series aluminum alloy, or a 3-series aluminum alloy, or a 5-series aluminum alloy; among them, 1-series aluminum alloys are more preferable.

If the aluminum foil is a composite layer aluminum alloy, further, the aluminum foil is a composite layer aluminum foil with a sacrificial anode function.

Furthermore, the composite layer aluminum foil comprises a core material and a skin material, wherein the skin material is positioned on the outer side of the core material, and the corrosion potential of the skin material is lower than that of the core material.

Further, the core material is selected from 1 series aluminum alloy, 3 series aluminum alloy or 5 series aluminum alloy; among them, 1-series aluminum alloys are more preferable.

Further, the leather material is selected from 7 series aluminum alloy or modified aluminum alloy added with zinc.

Further, the core material is selected from the following aluminum alloys: 1050. 1060, 1070, 1100 and modifications of the above aluminum alloys.

Further, the leather material is selected from the following aluminum alloys: 7072. improved 1 series aluminum alloy added with zinc, improved 3 series aluminum alloy added with zinc and improved 8 series aluminum alloy added with zinc.

The packaging material for the battery can be a composite film of copper foil and plastic, a composite film of stainless steel and plastic, or the like, in addition to a composite film of aluminum foil and plastic. Therefore, the utility model also introduces the A-D solution of the metal plastic composite film.

A. A packaging material for a battery, which is formed by compounding a thermoplastic resin film and a metal foil; the metal layer comprises a core material and a skin material positioned on the outer side of the core material, and the corrosion potential of the skin material of the metal layer is lower than that of the core material.

B. A battery packaging material is formed by compounding a thermoplastic resin film, a metal foil and a heat-resistant resin film, wherein the metal foil is positioned between the thermoplastic resin film and the heat-resistant resin film; the metal layer comprises a core material and a skin material positioned on the outer side of the core material, and the corrosion potential of the skin material of the metal layer is lower than that of the core material.

C. A packaging material for a battery, which is formed by compounding a thermoplastic resin film and a metal foil; wherein the metal layer is a metal having good corrosion resistance.

D. A battery packaging material is formed by compounding a thermoplastic resin film, a metal foil and a heat-resistant resin film, wherein the metal foil is positioned between the thermoplastic resin film and the heat-resistant resin film; wherein the metal layer is a metal having good corrosion resistance.

Wherein, the metal foil is made of aluminum, copper, or one or more of stainless steel, magnesium and zinc. Wherein, the aluminum in the metal foil of the utility model comprises pure aluminum and aluminum alloy; the copper comprises pure copper and copper alloy.

The utility model also provides an aluminum-plastic film, which comprises an aluminum foil layer and a plastic layer compounded on the surface of the aluminum foil layer; the aluminum foil layer is a composite layer aluminum foil and comprises a core material and a skin material positioned on the outer side of the core material, and the corrosion potential of the skin material of the aluminum foil layer is lower than that of the core material; wherein, the leather material positioned at the outer side of the core material is formed by compounding two layers of leather materials or more than two layers of leather materials, and the corrosion potential is reduced from inside to outside in sequence. Therefore, a surface corrosion gradient is formed, and the punctiform corrosion is more favorably prevented.

In order to form the potential gradient, the composite layer aluminum foil can be heated at high temperature, and the zinc element in the skin material is gradually diffused to the core material, so that the content of the zinc element is continuously and gradually changed and the corrosion potential is also continuously and gradually changed in the process of the aluminum foil layer from outside to inside, thereby avoiding the cliff-type change or mutation of the content of the zinc element and the corrosion potential, and being more beneficial to the conversion of the corrosion form into uniform laminar corrosion.

It should be noted that the boundaries between the layers of the composite layer are not well defined, and the composition and potential between the layers are not abrupt changes in a stepwise manner, but rather are gradual changes. Therefore, the composite layer aluminum foil of the utility model not only comprises the composition among the plurality of layers of different aluminum alloys before the high temperature treatment; also comprises a composite layer with gradually changed element content or gradually changed corrosion potential in the direction vertical to the surface of the aluminum foil after high-temperature treatment.

The utility model provides a plastic-aluminum membrane manufacturing approach:

the corresponding aluminum foil is first selected by the following water-resistant solution corrosion test: the corrosion resistance test adopts an OY aqueous solution corrosion test method, and the corrosion resistance service life of the aluminum foil under the corrosion test method is more than 500 hours;

then the aluminum foil and the plastic film are compounded to form the aluminum foil.

Wherein the corrosion life is preferably more than 1000 hours. More preferably greater than 2000 hours. The aluminum foil may be selected from the above-mentioned pure aluminum or aluminum alloy.

The utility model provides another aluminum-plastic film, which comprises an aluminum foil layer and a plastic layer compounded on the surface of the aluminum foil layer; the aluminum foil layer is a composite layer aluminum foil, the aluminum foil layer comprises a core material and a skin material positioned on the inner side of the core material, and the corrosion potential of the skin material of the aluminum foil layer in the electrolyte environment in the battery cell is lower than that of the core material. The inner side skin material is beneficial to preventing the corrosion of the inner side electrolyte to the aluminum foil layer.

Furthermore, the utility model provides a laminate polymer battery includes electrode material and electrolyte and the outside plastic-aluminum membrane of parcel usefulness, wherein, the plastic-aluminum membrane adopts above any kind of plastic-aluminum membrane. The aluminum-plastic film has the performance of resisting corrosion of cooling liquid.

Or put it another way, the utility model provides a laminate polymer battery includes the aluminium-plastic membrane of electric core and the outside parcel of electric core usefulness, wherein, the aluminium-plastic membrane adopts above any kind of aluminium-plastic membrane. The battery core comprises positive and negative electrode materials, electrolyte and the like; but the battery core does not contain external packaging materials such as external aluminum plastic films and the like.

Preferably, the soft package battery is wrapped by an aluminum-plastic film containing a rust-proof aluminum-aluminum foil layer.

More preferably, the rust-preventive aluminum is 3003, 3103 or 3005.

More preferably, laminate polymer battery adopts the plastic-aluminum membrane parcel that contains rust-resistant aluminium foil layer, the thickness on aluminium foil layer is 100~200 microns, or 200~300 microns, or 300~500 microns.

Preferably, the laminate polymer battery is wrapped by an aluminum-plastic film containing a composite aluminum foil layer, the composite aluminum foil layer comprises a core material and a skin material, and the skin material is located on the outer side of the core material and has a corrosion potential lower than that of the core material. Wherein, more preferably, the corrosion potential of the skin material is lower than that of the core material by 50-300 mV; more preferably 130 to 200mV lower.

More preferably, the core material is 3003 aluminum alloy or 3103 aluminum alloy, and the skin material is 7072 aluminum alloy or modified 3003 aluminum alloy with 1.0-2.5 mass% of zinc added.

More preferably, the thickness of the composite layer aluminum alloy is 100 to 200 micrometers, or 200 to 300 micrometers. The skin material compounding rate is preferably 5-15%, and the skin material compounding rate is more preferably 8-12%. The skin material composite ratio is a ratio of the thickness of the skin material to the thickness of the entire metal composite layer (core material + skin material).

For example, the aluminum foil in the aluminum plastic film wrapping the soft package battery is 3003 aluminum foil compounded 7072 aluminum foil, the thickness of the 3003 aluminum foil layer is 200-300 microns, and the thickness of the 7072 aluminum foil layer is 20-30 microns.

Preferably, the soft package battery is wrapped by an aluminum-plastic film containing the composite layer aluminum foil with the function of the sacrificial anode.

From another angle, the utility model discloses still provide following laminate polymer battery solution, a laminate polymer battery promptly, it adopts the plastic-aluminum membrane packing, and this laminate polymer battery body has following resistant coolant liquid corrosion resistance:

the corrosion resistance test method comprises the following steps: carrying out OY aqueous solution corrosion experiment;

and soaking the body of the soft package battery in a cooling liquid, wherein the corrosion-resistant service life of the soft package battery under the environment is more than 500 hours.

Furthermore, the corrosion-resistant service life of the soft package battery body is longer than 1000 hours. Further, the corrosion-resistant service life of the soft package battery body is more than 2000 hours.

Alternatively, the corrosion resistance test method is an internal corrosion resistance test in ASTM D2570 standard, or the aluminum foil wrapped outside is evaluated by using a method similar to section 5.14 "internal corrosion resistance test" in QC/T468-2010 standard.

The utility model discloses the OY aqueous Solution (OYama Water Solution) corrosion experiment that indicates in is the general OY aqueous Solution corrosion experiment of heat exchanger aluminothermic transmission trade.

So that the soft package battery body can be soaked in cooling liquid (such as antifreeze liquid containing glycol) for a long time (such as 5 years or more than 10 years) without generating corrosion failure of the outer package. Alternatively, and as described from an overall vehicle application perspective, it is preferred that the pouch cell have a life of greater than 5 years, preferably greater than 10 years, and more preferably greater than 15 years, for corrosion resistance to coolant (e.g., antifreeze fluids consisting primarily of ethylene glycol and water).

The term "life" refers to the defect that the soft package battery body cannot be corroded and perforated during the life span. The utility model discloses a obtain above-mentioned resistant coolant liquid corrosion behavior, above-mentioned suitable aluminum alloy material and suitable thickness need be chooseed for use to the aluminium foil in the plastic-aluminum membrane. For example, the aluminum plastic film is preferably composed of an aluminum foil layer and a thermoplastic resin film laminated on the aluminum foil, wherein the aluminum foil is formed of the aluminum alloy having high corrosion resistance against the antifreeze solution, and the thickness is preferably 100 to 300 μm. The existing soft package battery product does not consider the application of soaking in the anti-freezing solution, and does not have the function of being soaked in the anti-freezing solution for a long time without failure; and the utility model discloses a laminate polymer battery product possesses above-mentioned special characteristic. The utility model discloses well laminate polymer battery structure can divide into laminate polymer battery body and positive and negative electrode utmost point ear, so, the laminate polymer battery body is the laminate polymer battery part except that positive and negative electrode utmost point ear.

On the basis above, the utility model discloses still provide following laminate polymer battery heat control device, this laminate polymer battery heat control device include above laminate polymer battery in one kind or several kinds of laminate polymer battery. After the soft package battery is packaged by the aluminum plastic film resistant to the soaking corrosion of the cooling liquid, the soft package battery can be soaked in the cooling liquid (such as anti-freezing cooling liquid), so that heat exchange can be directly carried out with the cooling liquid. The heat exchange effect of the battery is better like this, and the temperature everywhere is more even about the battery about and about.

The pouch battery thermal control device as described above, further comprising a cooling liquid, the outer package of the pouch battery being in direct contact with the cooling liquid. Further, the cooling liquid included in the battery thermal control device is water, a mixed liquid containing ethanol and water, a mixed liquid containing ethylene glycol and water, a mixed liquid containing propylene glycol and water, or other antifreeze cooling liquids. The cooling liquids are cooling liquids commonly used in automobiles and industry at present, and are not insulating cooling media but conductive cooling liquids with conductive performance (including weak conductive performance); however, the above-mentioned conductive cooling liquid has advantages of high thermal conductivity, good fluidity, high thermal conductivity, and relatively low cost, compared to an insulating type cooling medium such as silicone oil or transformer oil.

On the basis above, the utility model provides a following laminate polymer battery heat control device, this laminate polymer battery heat control device include laminate polymer battery and coolant liquid, a serial communication port, laminate polymer battery's extranal packing and coolant liquid direct contact, laminate polymer battery adopt above laminate polymer battery in one or several kinds.

Further, this heat control device still includes mainboard and shell body, and mainboard and shell body form the seal chamber, and laminate polymer battery's electrode stretches out on the mainboard, and laminate polymer battery's body is arranged in the seal chamber.

Further, the thermal control device further comprises a partition; at least part of the surface of the separator is in direct contact with at least part of the outer surface of the soft package battery, and a fluid channel is arranged in the separator; a battery unit is formed by a plurality of soft package batteries, and the battery unit and the partition plate are arranged at intervals. The number of the soft package batteries can be 1, or 2, or more, and form one battery unit. Among these, the battery packaging material is preferably an aluminum plastic film. Further, the partition plate is made of a metal material; the corrosion potential of the partition board is negative to the corrosion potential of the aluminum foil in the aluminum-plastic film, or the corrosion potential of the partition board is negative to the corrosion potential of the skin material of the aluminum foil in the aluminum-plastic film. The baffle plays the effect of supporting laminate polymer battery and organizes the flow field effect, and the baffle can be the extrusion flat pipe, also can be various fin forms such as straight fin, staggered sawtooth fin.

Furthermore, the periphery of the battery core body is sealed by the aluminum-plastic film, and only a battery electrode or an electrode connecting port extends out of the aluminum-plastic film; the battery thermal control device further comprises a mainboard, wherein a socket is arranged on the mainboard, and the battery is inserted into the mainboard through the socket from the part extending out of the aluminum plastic film.

Further, the battery heat control device further comprises an outer shell, an accommodating cavity is formed in the outer shell, the battery unit and the partition plate are arranged in the accommodating cavity of the outer shell, and the outer shell further comprises a fluid inlet and a fluid outlet.

Further, the main plate is located in the accommodating chamber of the outer case and divides the accommodating chamber into two parts, the first part accommodates the battery cell main body and the partition plate, the second part accommodates the electrode and/or the electrode connection port part protruding from the aluminum plastic film, and the first part and the second part are physically isolated from each other.

The utility model discloses still introduce following battery cooling system, it adopts above-mentioned battery thermal control device, and this cooling system still includes cooling pump, coolant liquid heat exchanger and corresponding water pipe, and wherein, the radiator carries out direct heat exchange's gas-liquid heat exchanger for coolant liquid and ambient air. Due to the adoption of the battery heat control device, the heat exchange efficiency of the battery is very high, the heat transfer resistance between the battery body and the cooling liquid is very low, and the heat exchange temperature difference is very small; therefore, on the premise of ensuring that substances (such as electrolyte, diaphragm and solid electrolyte interface film SEI) in the battery body do not exceed the temperature, the cooling liquid can be allowed to have higher temperature, namely, the requirement of battery cooling on the outside is reduced, the cooling cost is reduced, and the gas-liquid heat exchanger can be used.

In the above aluminum-plastic film resistant to corrosion by the coolant and the pouch battery wrapped with the aluminum-plastic film, the aluminum foil layer is either initially in contact with the coolant as a water contact layer or is in contact with the coolant as a water contact layer after an outer protective layer (such as a nylon film) is peeled off.

Drawings

FIG. 1 is a schematic view of a first aluminum-plastic film structure;

FIG. 2 is a schematic view of a second aluminum-plastic film structure;

FIG. 3 is a schematic structural view of a third aluminum plastic film;

FIG. 4 is a schematic diagram of a battery using the aluminum-plastic film;

FIG. 5 is a schematic diagram of a pouch cell;

figure 6 is a schematic diagram of a pouch cell thermal control device.

FIG. 7 is a graph showing the effect of a corrosion resistance comparison test between a single-layer aluminum alloy (left view) and a composite-layer aluminum alloy (right view);

the fin partition shown in fig. 8 is a staggered sawtooth fin, and comprises a plurality of tooth-shaped units, the inside of the same row of tooth-shaped units is communicated to form a fluid channel, adjacent tooth-shaped units are arranged in a staggered manner from front to back, and the top and bottom planes of the tooth-shaped units are in direct contact with a battery.

The fin spacer shown in fig. 9 is a flat fin comprising parallel vertical plates and upper and lower flat plates connected to both ends of the vertical plates, the flat plates are in direct contact with the battery, and fluid passages are formed between the vertical plates.

Detailed Description

The present invention will be further described with reference to specific examples, but the scope of the present invention includes, but is not limited to, such.

Example 1

Referring to the attached drawing 1, an aluminum-plastic film is provided, which includes an aluminum foil layer 1 and

plastic layers

2 and 3 compounded on the surface of the aluminum foil layer 1, wherein the aluminum foil layer 1 is made of 3003 aluminum alloy. The aluminum foil heat-sealing composite material is characterized by sequentially consisting of an protective layer 2, an aluminum foil layer 1 and a heat-sealing layer 3 from outside to inside, wherein the outer protective layer 2 is made of nylon (ON), the inner heat-sealing layer 3 is made of a cast polypropylene film (CPP), and the inner heat-sealing layer 3 plays an insulating role at the same time to keep electrical insulation between the aluminum foil layer 1 and an internal electrolyte. The inner and outer

plastic layers

2 and 3 are bonded and compounded with the aluminum foil layer 1 through adhesives 4 and 5 (or adhesives). The adhesive layer is composed of any one of polyester-urethane resin, polyether-urethane resin, isocyanate resin and unsaturated carboxylic acid-grafted polyolefin resin.

Above, the aluminum foil layer 1 can also be replaced by other rust-proof aluminum, such as 5 series rust-proof aluminum or other 3 series rust-proof aluminum, more specifically such as: 3004. 3005, 3105, 5052, 5086, etc.; the aluminum foil layer 1 may be replaced with 6-series aluminum alloy, such as 6063. Of course, the aluminum foil layer may be pure aluminum, which is 1050 aluminum alloy, 1060 aluminum alloy, 1100 aluminum alloy, or a modification based on the pure aluminum base. These pure aluminum also have good corrosion resistance.

The soft package battery formed by the aluminum plastic film can be directly soaked in cooling liquid, and has long-term cooling liquid corrosion resistance, wherein the cooling liquid is preferably water-based cooling liquid containing ethylene glycol or/and propylene glycol. In the process of forming the pouch battery, a deep drawing process is required. After the pouch battery is soaked in the cooling liquid for a period of time, the nylon layer 2 may swell, dissolve and peel off, but the insulation property, the sealing property and the long-term cooling liquid corrosion resistance of the aluminum plastic film are not affected. Because the aluminum plastic film of the soft package battery has the function of long-term corrosion resistance to the cooling liquid, the soft package battery can be directly soaked in the cooling liquid for cooling. The soft package battery has the beneficial effects that the heat exchange efficiency of the soft package battery is very high, and the soft package battery cannot be overheated even when a large current does work, so that the power density and the reliability of the whole battery system can be improved.

Compared with 8 series aluminum alloy, 3 series or 5 series antirust aluminum has better anti-freezing liquid corrosion resistance, longer corrosion resistance life and more reliability.

Example 2

As shown in fig. 2, an aluminum-plastic film is provided, which includes an aluminum foil layer 1 and

plastic layers

2 and 3 compounded on two side surfaces of the aluminum foil layer, wherein the aluminum foil layer 1 is formed by compounding a 3-series aluminum alloy aluminum foil layer 7 (core material) and a 7-series aluminum alloy aluminum foil layer 6 (skin material). If the 3003 aluminum alloy and the 7072 aluminum alloy are compounded, the 7072 aluminum alloy layer 6 is compounded on the outer side of the 3003 aluminum alloy layer 7. Alternatively, the aluminum plastic film is formed by laminating a heat seal layer, a3003 aluminum foil layer, a 7072 aluminum foil layer and a nylon layer in this order, wherein the aluminum foil layer and the plastic layer are bonded by a conventional adhesive. Or, the aluminum-plastic film comprises the following layers from inside to outside: the aluminum foil comprises a heat sealing layer, an adhesive layer, a3003 aluminum foil core layer, a 7072 aluminum foil skin layer, an adhesive layer and a nylon protective layer.

The corrosion potential of the 3003 aluminum alloy is about-0.72V and the corrosion potential of the 7072 aluminum alloy is about-0.88V. Since the corrosion potential of 7072 aluminum alloy is lower than that of 3003 aluminum alloy, 7072 aluminum alloy acts as a sacrificial anode when in contact with the coolant, protecting the core from corrosion. The thickness of the heat-sealing layer is preferably 30-50 micrometers, the thickness of the nylon protective layer is preferably 20-30 micrometers, and the thickness of the composite aluminum foil layer is preferably 200-300 micrometers; among them, the thickness of the 7-series aluminum alloy layer 6 is preferably 10% of the entire aluminum foil layer 1. Similarly, the inner and outer

plastic layers

2 and 3 are bonded and compounded with the aluminum foil layer 1 through

adhesives

4 and 5 respectively.

The heat-treated state of the aluminum foil layer may be an O state, an H14 state, or an H16 state, with an O state being preferred.

The aluminum foil layer of the embodiment is thicker than an aluminum foil layer in a traditional aluminum-plastic film, so that the anti-freezing liquid corrosion resistance performance for a long time is facilitated, and the water vapor barrier property of the aluminum-plastic film is also facilitated, so that the long-term reliability of the soft package battery package is ensured.

Example 3

In this embodiment, the aluminum alloy layer 1 is also formed by compounding the core material 7 and the sheath material 6, and the sheath material 6 is an anode protection layer, substantially similarly to the second embodiment. Except that the 7072 aluminum alloy was replaced with a3003 aluminum alloy with added zinc Zn (3003 +1% Zn or 3003+1.5% Zn as shown below) as the sacrificial anode layer. The potential of 3003+1% Zn is about-0.83V to-0.89V, and the potential is lower than that of 3003 core material.

TABLE 1 chemical composition of the alloys

Example 4

Fig. 3 provides an aluminum-plastic film, which includes an aluminum foil layer 1 and a thermoplastic resin film layer 3 compounded on the inner side of the aluminum foil layer, wherein the aluminum foil layer is a composite aluminum foil, the aluminum foil layer includes a core material and a skin material located on the outer side of the core material, and the corrosion potential of the skin material of the aluminum foil layer is lower than that of the core material. Further, the core material of the aluminum foil layer is formed of corrosion-resistant aluminum alloy or pure aluminum. For example, the composite aluminum foil layer 1 is formed by compositing a 3-series aluminum foil layer 7 (e.g., 3003) and a 7-series aluminum foil layer 6 (e.g., 7072). The aluminum foil layer 1 is only compounded with the thermoplastic resin film layer 3 (also called heat sealing layer 3, for example, using CPP) on the inner side, and an outer nylon protective layer is not needed.

The thickness of the heat sealing layer 3 (CPP) is preferably 30-50 microns, and the thickness of the whole composite aluminum foil layer 1 is preferably 200 microns. Wherein, a 7-series aluminum alloy layer 6 is compounded on the outer side to be used as a sacrificial anode; the thickness of the 7-series aluminum alloy is preferably 10% of the entire aluminum foil layer 1. When used as a pouch battery package and the battery is immersed in cooling water, the 7-series aluminum alloy serves as a water contact layer. The inner thermoplastic resin film layer 3 and the aluminum foil layer 1 are bonded and compounded through a common adhesive 5 for aluminum plastic films. The soft package battery made of the aluminum plastic film can be soaked in cooling liquid for a long time, and has a long-term cooling liquid corrosion resistance function.

Example 5

In this embodiment, the structure is substantially similar to that of the fourth embodiment, the core material layer is also 3003 aluminum alloy, except that the skin material 6 is a metal zinc (Zn) layer instead of the 7-series aluminum foil layer, and the thickness of the metal zinc layer may be preferably 10 to 20 μm, and the metal zinc layer may be formed by a zinc spraying process. The metal zinc has a lower potential than the aluminum alloy core material, and therefore can be used as a sacrificial anode to protect the core material from corrosion. And the metal zinc can also effectively prevent the pitting corrosion of the aluminum alloy core material.

Example 6

This example describes a battery using the above aluminum plastic film and an application of the battery. The soft package battery comprises an electrode material, a polymer electrolyte and an aluminum-plastic film for external wrapping, wherein the soft package battery is wrapped by the aluminum-plastic film comprising a composite layer aluminum foil with a sacrificial anode function, for example, the composite layer aluminum alloy aluminum foil in the second or fourth embodiment is that the aluminum foil is a3003 aluminum alloy core material, and a 7072 aluminum alloy skin material is composited outside the aluminum foil. After the soft package battery is packaged by the aluminum plastic film resistant to soaking corrosion of the anti-freezing cooling liquid, the soft package battery can be soaked in the anti-freezing cooling liquid, so that heat exchange can be directly carried out with the anti-freezing cooling liquid. As shown in fig. 4, after the pouch cell 11 is sealed with the main board 13 by the top edge 112, the body of the pouch cell 11 is immersed in the antifreeze coolant. Therefore, the heat exchange effect of the battery is better, and the temperatures of the upper part, the lower part, the left part and the right part of the battery are more uniform.

Example 7

The present embodiment adopts an aluminum plastic film structure similar to that of the second embodiment, except that the adhesive for adhering the nylon protective layer adopts a release agent which is convenient to separate. I.e. the nylon protective layer is similar to a release film. Therefore, the nylon layer can protect the aluminum foil layer in the deep drawing forming process of the aluminum plastic film; after the deep drawing process, the nylon layer can be easily separated from the aluminum foil layer, thereby forming an aluminum-plastic film similar to that of the fourth embodiment.

Example 8

This example describes a pouch polymer lithium ion battery wrapped with an aluminum plastic film as described in example one, which is substantially the same as example six, except that the aluminum foil used in the aluminum plastic film for packaging the pouch battery is formed of a single layer of aluminum alloy formed of a rust-proof aluminum foil, such as 3003 aluminum foil.

Example 9

This example describes a pouch polymer lithium ion battery wrapped with an aluminum-plastic film as described in example one, which is substantially the same as example six, except that the aluminum foil used in the aluminum-plastic film for packaging the pouch polymer lithium ion battery is formed of a single layer of aluminum alloy, which is formed of a 1-series aluminum alloy foil, such as an O-state 1050 aluminum alloy aluminum foil or other pure aluminum.

Example 10

The aluminum plastic film described in this embodiment is formed by laminating a thermoplastic resin film (i.e., a heat seal layer, such as polypropylene) and a composite aluminum alloy aluminum foil layer. The core material layer 7 of the aluminum foil layer is made of pure aluminum with the mark of 1050, the skin material 6 is made of aluminum alloy (simplified and expressed as AA1050+ 4-7% Zn) with 4% -7% of zinc element added on the basis of the pure aluminum 1050, the corrosion potential of the skin material is negative to the core material, the skin material serves as a sacrificial anode protection core material, and the skin material compounding rate is preferably 10 +/-2%. The heat treatment state of the composite aluminum alloy aluminum foil layer is an annealing state (O state), and the thickness is preferably 100-300 micrometers, and more preferably 200-300 micrometers. The composite aluminum foil layer has excellent cooling liquid corrosion resistance, and good ductility and deep drawing performance.

The plastic-aluminum film or the aluminum foil thereof is required to have better ductility and deep drawing performance, for example, the cup drawing value of the plastic-aluminum film or the aluminum foil thereof is preferably more than 10 mm as tested by GB/T4156-2007 Eriken cup drawing test of thin metal sheets and thin strips.

The aluminum plastic film or the aluminum foil thereof is required to have better coolant corrosion resistance. The corrosion resistance test method adopts an OY aqueous Solution (OYama Water Solution) corrosion test commonly used in the heat exchanger thermite transmission industry. The OY aqueous corrosion test is approximately as follows:

each area is 160cm²The aluminum foil sample of (1) was prepared in 500mL of OY aqueous solution, and the pH of the OY aqueous solution = 3.0.

Composition of aqueous OY solution: chloride ion (Cl)^-) 195 +/-1 mg/L, sulfate ion (SO)₄ ^2-) 60 + -0.2 mg/L, iron ion (Fe)³⁺) 30 + -0.1 mg/l, copper ion (Cu)²⁺) 1 +/-0.01 mg/L.

Temperature of aqueous OY solution: stirring at 88 ℃ for 8 hours at the speed of 0.6-0.9 m/s (200rpm), and then standing for 16 hours; the above cycle is repeated.

In the OY aqueous solution corrosion test, the corrosion life of the aluminum foil of the aluminum plastic film is preferably more than 1000 hours.

The corrosion life of the plastic-aluminum film or its aluminum foil can also be evaluated by its corrosion life when immersed in the anti-freezing solution on a real vehicle, for example, the plastic-aluminum film with a life of more than 5 years, preferably more than 10 years, and more preferably more than 15 years, is selected on a real vehicle.

Example 11

This example describes a battery packaging material using a metal plastic composite film, wherein the metal is a pure copper foil or a copper alloy foil, and the heat seal layer uses PP as a thermoplastic resin film. Namely, a composite film formed by copper foil and PP. Copper possesses better corrosion resistance and better ductility.

Example 12

This example describes a pouch battery made of the above packaging material for a battery, the battery being formed of a cell containing positive and negative electrodes and a polymer electrolyte and a packaging material outside the cell, the above packaging material for a battery being used for packaging outside the cell. Because the packaging material takes the function of resisting the immersion of the cooling liquid into consideration, the battery can be directly immersed in the cooling liquid (such as the antifreeze liquid for vehicles) for a long time, thereby ensuring the reliability, the safety and the high efficiency of heat dissipation.

Example 13

As shown in fig. 5 and 6, the thermal control device for a battery according to the present embodiment employs the pouch battery that can be directly immersed in the cooling liquid for a long period of time. The heat control device for the soft package battery comprises the soft package battery 11 and a cooling liquid, wherein an outer package of the soft package battery 11 is in direct contact with the cooling liquid, and the soft package battery 11 is formed by any one of the above packaging materials (such as an aluminum-plastic film resistant to corrosion of the cooling liquid). The thermal management device further includes a spacer 12 (e.g., staggered serrated fins); at least part of the surface of the separator 12 is in direct contact with at least part of the outer surface of the pouch battery 11, and a fluid channel 121 is arranged in the separator 12; one pouch battery 11 constitutes one battery unit (of course, two pouch batteries may be used to constitute one battery unit), and the battery unit is disposed at an interval from the separator 12. The separator plate plays a role in supporting the soft package battery on one hand, and plays a role in organizing a cooling liquid flow field on the other hand.

The periphery of the battery core body is sealed by the aluminum-plastic film, and only a battery electrode or an electrode connecting port extends out of the aluminum-plastic film; the battery thermal control device further comprises a main board 13, wherein a socket is arranged on the main board 13, and the battery extends out of the aluminum plastic film (namely, the positive and negative electrode tabs 111) and is inserted into the main board 13 through the socket. Preferably, part of the top edge 112 of the battery is also inserted onto the main board 13 through said socket.

The battery thermal control device further comprises an outer casing 14, wherein the outer casing 14 is internally provided with a containing cavity, the battery unit and the partition plate 12 are arranged in the containing cavity of the outer casing 14, and the outer casing 14 further comprises a fluid inlet and a fluid outlet (not shown in the figure).

The main plate 13 is located in the housing chamber of the outer case 14 and partitions the housing chamber into two parts, a first part housing the cell main body and the separator 12, and a second part housing the electrode and/or the electrode connection port part protruding from the aluminum plastic film, the first part and the second part being physically isolated from each other.

The battery thermal control device also comprises cooling liquid, wherein the cooling liquid is water, or mixed liquid containing ethylene glycol and water, or mixed liquid containing propylene glycol and water, or anti-freezing cooling liquid.

Preferably, the separator 12 is made of a metal material, and the corrosion potential of the separator 12 is negative to the corrosion potential of the aluminum foil in the aluminum plastic film, for example, the metal foil of the packaging material is AA1050 aluminum alloy, and the separator 12 is AA1050+5% Zn. Or, the corrosion potential of the partition board 12 is negative to that of the skin material of the aluminum foil of the aluminum plastic film, for example, the metal foil of the packaging material is made of AA1050/AA1050+5% Zn aluminum alloy, and the partition board 12 is made of AA1050+7% Zn. Thus, the separator can also play a role in protecting the anode and further prevent the corrosion failure of the battery.

Example 14

This example is substantially the same as example 10, except that the core material and the skin material of the composite layer aluminum alloy may be selected from any one of options 1 to 6 in the following table:

example 15

This example is substantially the same as example 10, except that an aluminum foil material and an aluminum plastic film excellent in formability (or deep drawability) were evaluated and selected in the following manner.

The moldability test and evaluation were conducted in accordance with the following A to F:

A. the mold core is made of Teflon material, the size of the mold is 34mm × 44mm, the radius R =0.6mm, the forming depth of the punch forming tester is adjusted to be a certain value between 5.0mm and 15.0mm according to the test requirement, and the pressure of compressed air is adjusted to enable the side pressure of the mold to be larger than or equal to 3.0 MPa.

B. And (3) taking a sample film with a smooth and clean surface and no wrinkles, and cutting the film with the width of not less than 100 mm and the length of not less than 200 mm for testing.

C. And (4) enabling the CPP surface of the film to face the mold core, and putting the mold core into a punch forming tester. The film is ensured to be flat and wrinkle-free, and the side pressure film allowance is sufficient.

D. And pressing the button to perform punch forming, and carefully taking out the sample for later use after the punch forming is completed.

E. The method comprises the following steps Combine together the CPP face of stamping forming back sample with the CPP face of not stamping forming sample, guarantee that the sample levels no deformation, be not more than 2 mm department along stamping forming edge and carry out the heat-seal, the heat-seal condition is: heat seal temperature 190^oC (heating up and down uniformly), the heat sealing pressure is 0.2 MPa, and the heat sealing time is 6 seconds.

F. And (4) carrying out visual inspection on the punch forming sample after heat sealing, and checking whether the sample has the phenomena of cracking and layering.

Screening out the aluminum plastic film or the aluminum foil with the molding depth of more than 5.0mm by the method; more preferably, the aluminum plastic film or the aluminum foil with the molding depth of more than 10.0mm is screened out.

Example 16

This example is substantially the same as example 10, except that instead of being evaluated by the OY test, the corrosion resistance life of the aluminum foil of the aluminum plastic film is evaluated by the "internal corrosion performance test" at section 5.14 of the standard QC/T468-.

Wherein, the corrosion resistance test detection in section 5.14 of the QC/T468 standard is approximately as follows:

test temperature: 88^oC

Flow rate of mixed solution: 1.3 to 1.6L/s (liter per second)

Mixing the solution:

the type of the anti-freezing solution is as follows: 45% of ethylene glycol antifreeze, freezing temperature: -30^oC

ASTM water: 1L (liter) of distilled water contained 148 mg (mg) of sodium sulfide, 165mg of sodium chloride, 138mg of sodium bicarbonate.

Mixing ratio: 40% antifreeze solution +60% ASTM water.

Example 17

This example is substantially the same as example 10, except that the core material and the skin material of the composite layer aluminum alloy may be selected from any one of options 1 to 4 in the following table:

example 18

The embodiment provides an aluminum-plastic film, which comprises an aluminum foil layer and a plastic layer compounded on the surface of the aluminum foil layer; the aluminum foil layer is a composite layer aluminum foil and comprises a core material and a skin material positioned on the outer side of the core material, and the corrosion potential of the skin material of the aluminum foil layer is lower than that of the core material; wherein, the leather material positioned at the outer side of the core material is formed by compounding two layers of leather materials or more than two layers of leather materials, and the corrosion potential is reduced from inside to outside in sequence.

For example, the aluminum foil layer in the aluminum-plastic film sequentially comprises a core material, a first layer of skin material and a second layer of skin material from inside to outside, wherein the core material is AA1050 aluminum alloy, the first layer of skin material is AA1050 aluminum alloy added with 2% of Zn, and the second layer of skin material is AA1050 aluminum alloy added with 4% of Zn. Therefore, the corrosion potential is: core material > first layer skin material > second layer skin material. Therefore, the corrosion can be further guaranteed to be layered corrosion of layer-by-layer corrosion, so that the punctiform corrosion is further avoided, and the safety of the battery is guaranteed.

Example 19

In this example, a corrosion resistance comparison test was performed on a single layer 1050 aluminum alloy and a composite layer aluminum alloy (a core material is 1050 aluminum alloy, and a skin material is a sacrificial layer with a negative potential) in an OY test.

An antifreeze solution system is selected to carry out an OY experiment, the experiment time is 4 weeks, and after the experiment, the surface of the material is soaked in nitric acid to remove corrosion products, and the specific conditions are as follows:

as shown in fig. 7, after the antifreeze system OY is tested for 4 weeks, the left graph shows that the AA1050 single-layer aluminum alloy undergoes more obvious pitting and the pitting is more serious; while the right figure shows that no significant pitting occurred on the aluminum alloy surface of the composite sacrificial layer. From this, it is found that the occurrence of pitting corrosion can be effectively suppressed by compounding a skin material having a relatively negative corrosion potential on the surface of the aluminum alloy core material. After the plastic layer on the inner surface of the aluminum plastic film formed by the composite layer aluminum foil is heat sealed, the time of the aluminum foil for resisting the corrosion of cooling water can meet the automobile requirement; meanwhile, as the core material on the inner side of the aluminum foil is pure aluminum, the electrolyte corrosion resistance of the aluminum foil is superior to that of the traditional aluminum-iron-aluminum alloy, so that the service life and the safe use of the battery are ensured.

The present invention has been described in detail with reference to the specific embodiments, but the present invention is only by way of example and is not limited to the specific embodiments described above. Any equivalent modifications and substitutions to the disclosed embodiments are within the scope of the present invention as those skilled in the art will recognize. Accordingly, variations and modifications in equivalents may be made without departing from the spirit and scope of the invention, which is intended to be covered by the following claims.

Claims

1. A packaging material is an aluminum-plastic film, and the aluminum-plastic film comprises an aluminum foil layer and a plastic layer compounded on the surface of the aluminum foil layer; it is characterized in that the plastic layer is only compounded on the inner side of the aluminum foil layer; the aluminum foil layer is a composite layer aluminum foil and comprises a core material and a skin material positioned on the outer side of the core material, and the corrosion potential of the skin material of the aluminum foil layer is lower than that of the core material; wherein, the leather material positioned at the outer side of the core material is formed by compounding two layers of leather materials or more than two layers of leather materials, and the corrosion potential is reduced from inside to outside in sequence.

2. A packaging material comprising an aluminum foil as a water-resistant layer, wherein the aluminum foil has the following coolant corrosion resistance: the corrosion resistance test method is an OY aqueous solution corrosion experiment; the corrosion resistance life of the aluminum foil under the environment is more than 500 hours.

3. A packaging material is an aluminum-plastic film, and the aluminum-plastic film comprises an aluminum foil layer and a plastic layer compounded on the surface of the aluminum foil layer; the plastic layer is only compounded on the inner side of the aluminum foil layer, and the thickness of the inner plastic layer is 50-300 microns; wherein the aluminum foil layer is a single-layer aluminum foil and is formed by corrosion-resistant aluminum alloy or pure aluminum; alternatively, the first and second electrodes may be,

the aluminum foil layer is a composite layer aluminum foil and comprises a core material and a skin material positioned on the outer side of the core material, and the corrosion potential of the skin material of the aluminum foil layer is lower than that of the core material.

4. A pouch battery, which comprises an electrode material, an electrolyte and an aluminum plastic film for external wrapping, wherein the aluminum plastic film adopts the aluminum plastic film as claimed in any one of claims 1 to 3.

5. The utility model provides a laminate polymer battery, its adopts the plastic-aluminum membrane packing, its characterized in that, this laminate polymer battery body has following resistant coolant liquid corrosion resistance: the corrosion resistance test method is an OY aqueous solution corrosion experiment; and soaking the body of the soft package battery in a cooling liquid, wherein the corrosion-resistant service life of the soft package battery under the environment is more than 500 hours.