CN113497294A

CN113497294A - Power battery module

Info

Publication number: CN113497294A
Application number: CN202110299377.1A
Authority: CN
Inventors: 不公告发明人
Original assignee: Chen Daixiu
Current assignee: Chen Daixiu
Priority date: 2020-03-20
Filing date: 2021-03-20
Publication date: 2021-10-12
Also published as: WO2021185372A1; CN113497293A

Abstract

The power battery module comprises a battery pack, a heat exchange medium and a module shell; the battery pack comprises a plurality of single batteries and power connecting sheets, and the power connecting sheets are electrically connected with the adjacent single batteries; the shell is wrapped outside the battery pack and the sampling module, the sampling module comprises a flexible circuit board and a protection device, and the flexible circuit board is electrically connected with a plurality of temperature sensors and current sensors; the temperature sensor is connected with the power connecting sheet, and the current sensor is electrically connected with the power connecting sheet; the protection device comprises an outer insulating layer and an inner insulating layer, the outer insulating layer covers the outer surface of the flexible circuit board, and the inner insulating layer is clamped between the power connecting sheet and the single battery.

Description

Power battery module

Technical Field

The invention belongs to the field of power batteries, and particularly relates to a new energy automobile battery module.

Background

Compared with traditional dry batteries and fuel cells, the new energy lithium battery has the excellent characteristics of good safety, high energy storage density, portability and the like, is widely applied to various electronic products such as modern mobile phones, computers and the like, and the currently used lithium battery monomer mainly comprises a shell, an electrolyte solution and a battery cell which are placed in the shell, and a positive electrode and a negative electrode are arranged at the top end of the lithium battery monomer.

In addition, present laminate polymer battery module is not enough to the sealed of laminate polymer battery side, if directly arrange the aquatic in and can lead to water to follow the side seepage and enter and lead to battery bulging inefficacy.

The soft packaging material of the soft package battery is usually an aluminum-plastic film, if 2 layers of aluminum foils are already included in the aluminum-plastic film before the cell is packaged, although the two layers of aluminum foils are isolated and insulated by plastic layers, in the process of trimming after the battery is packaged, the two layers of aluminum foils at the trimming position are easy to creep when high voltage (such as more than 1800 volts) is applied between the two layers of aluminum foils due to metal scraps and the like or due to the fact that the two layers of aluminum foils are simultaneously exposed and the distance is too short (the thickness of the second resin is less than 0.1 mm).

In the existing battery sealing scheme, top edge sealing is adopted, and the side edge is soaked in water, so that water seepage is easily caused to the side edge.

With the exhaustion of petroleum energy and the improvement of environmental protection requirements of people, the replacement of the existing fuel vehicles by electric vehicles or hybrid vehicles has become a necessary development trend. Therefore, the importance of the battery module as a core power source of the electric automobile is particularly prominent.

The new energy automobile power battery requires large capacity of the battery module, which brings the problems of large volume, complex structure and the like of the battery module. Since the battery module is generally formed by connecting hundreds of unit cells in series, the connection between the unit cells is complicated in mass production. Meanwhile, in order to ensure the safety performance of the vehicle-mounted power battery, the temperature and the voltage of each single battery need to be monitored. Therefore, the sampling module in the battery module is also very important.

With present, the inside sampling module of battery module is mostly traditional pencil sampling mode, utilizes the sampling pencil to link to each other and the conveying sampling signal with battery cell alone. The sampling method has the disadvantages that the circuit is complicated, the sampling wire harness needs to be manually assembled, and the automatic production is not facilitated; and the phenomena of misloading, neglected loading and the like are easy to occur in the assembling process. In addition, a wire harness fixing structure is required to be independently arranged, so that the wire harness fixing structure is complex and is easy to cause electric leakage due to wire skin abrasion.

Therefore, on the premise of realizing large capacity of the battery module, the connection and sampling structure of the battery module needs to be simplified as much as possible, so that the battery module is simple to assemble and good in safety performance.

Disclosure of Invention

In order to achieve the above object, the first part of the present invention provides the following solutions:

the power battery module is characterized by comprising the following structures: a housing; the lithium battery units are arranged in the shell side by side, and the top ends of the lithium battery units are provided with anodes and cathodes; the first conductive polar plate comprises a first positioning part and a first contact part, the first positioning part is provided with a plurality of first positioning grooves which are arranged at intervals, and the positive electrodes respectively penetrate through the first positioning grooves and are electrically connected with the first positioning grooves; and the second conductive polar plate comprises a second positioning part and a second contact part, the second positioning part is provided with a plurality of second positioning grooves which are arranged at intervals, and the negative electrode respectively penetrates through the second positioning grooves and is electrically connected with the second positioning grooves.

The power battery module comprises a battery pack, a sampling module and a shell. The battery pack comprises a plurality of single batteries and power connecting sheets, and the power connecting sheets are electrically connected with the adjacent single batteries. The shell wraps the battery pack and the sampling module. The sampling module includes flexible line way board and protection device, wherein:

the flexible circuit board is electrically connected with a plurality of temperature sensors and voltage sampling terminals, the temperature sensors are connected with the power connecting sheet, and the voltage sampling terminals are electrically connected with the power connecting sheet; the protection device comprises an outer insulating layer and an inner insulating layer, wherein the outer insulating layer covers the outer surface of the flexible circuit board, and the inner insulating layer is clamped between the power connecting sheet and the single battery.

The power connecting piece comprises a first connecting end, a second connecting end and a fixed end, wherein the first connecting end and the second connecting end are respectively and electrically connected to the positive terminal and the negative terminal of two adjacent single batteries, and the temperature sensor and the voltage sampling terminal are connected to the fixed end.

The above is the first part of the present invention.

The second part

The second part of the invention also provides the following scheme of the soft package battery and the scheme of the battery cooling device:

the invention provides a soft package battery, which comprises a plurality of battery cores, wherein a metal plastic composite film (such as an aluminum plastic film or a steel plastic film) is wrapped outside each battery core, the metal plastic composite film comprises a first metal layer (an aluminum layer or a steel layer), each battery core is provided with a heat-sealing top edge and a heat-sealing side edge, the heat-sealing top edge and the heat-sealing side edge are provided with cutting edges, and the cutting edges are provided with the first metal layer;

a second packaging layer is wrapped outside the metal plastic composite films of the plurality of battery cores, and the second packaging layer comprises a second metal layer; or, a second metal layer (preferably an aluminum layer or a steel layer) or a metal foil adhesive tape (preferably an aluminum foil adhesive tape) is further wrapped outside the metal plastic composite films of the plurality of battery cells;

and the second metal layer is electrically insulated from the first metal layer in the edge cutting or is subjected to electrical insulation treatment, so that the second metal layer is electrically insulated from the first metal layer.

The invention also provides a battery, the battery is a metal hard shell battery, the metal hard shell of the battery is wrapped with the insulating layer, the outside of the insulating layer is also wrapped with the second metal layer, and the second metal layer is insulated from the metal hard shell. Preferably, its dielectric strength is greater than 2000V.

When the soft package battery wrapped with the second metal layer is soaked in the cooling liquid, the second metal layer is in direct contact with the cooling liquid. The metal plastic composite film is not contacted with the cooling liquid.

Said "second" is a broad term; for example, the second metal layer generally refers to another metal packaging layer wrapped outside the battery cell, which is different from the metal layer in the metal composite film. The second metal layer has the functions of water resistance, electromagnetic radiation prevention, soaking and sealing.

Preferably, the creepage distance between the second metal layer and the first metal layer in the cut edge is greater than 2mm, and more preferably greater than 4 mm.

Preferably, the number of the cells in the plurality of cells is one or two.

One of the preferable schemes is that no insulator is arranged between the exposed part of the second metal layer and the exposed part of the first metal layer, and the linear distance between the exposed part of the second metal layer and the exposed part of the first metal layer closest to the exposed part of the second metal layer is more than or equal to 2 mm; or the interval of the insulator exists between the exposed part of the second metal layer and the exposed part of the first metal layer, the insulator has at least 1 convex peak, the sum of the distance d1 from the exposed part of the second metal layer to the highest part of the convex peak of the nearest insulator, the distance between the highest parts of the adjacent convex peaks and the distance d2 from the exposed part of the first metal layer to the highest part of the convex peak of the nearest insulator is more than or equal to 2 mm.

Preferably, the wrapping process of wrapping the battery core with the metal plastic composite film and the wrapping process of further wrapping with the second metal layer are performed separately. Or the metal plastic composite film and the second metal layer are separated before the cell wrapping process, and are not a composite packaging film which is compounded into a whole.

The invention also provides a manufacturing method for manufacturing the soft package battery, which comprises the following steps:

wrapping the battery core of the soft package battery with a metal plastic composite film (an aluminum plastic film or a steel plastic film) to form a top edge and a side edge, wherein the metal plastic composite film comprises a first metal layer (an aluminum layer or a steel layer);

heat sealing the top and side edges to form a heat sealed top edge and heat sealed side edges, the heat sealed side edges having a cut edge with a first metal layer therein;

performing electric insulation treatment (such as wrapping an insulating tape) outside the cut edges of the heat-sealed side edges to prevent the first metal layer in the cut edges from being exposed;

and wrapping a second metal layer (an aluminum layer or a steel layer) or wrapping a metal foil adhesive tape (such as an aluminum foil adhesive tape, a copper foil adhesive tape or a stainless steel foil adhesive tape) outside the metal plastic composite film to form the soft package battery.

The steps are preferably performed sequentially, and other process steps can be performed among the steps.

The metal plastic composite film and the second metal layer are used as packaging materials of the soft package battery, and both belong to a part of the soft package battery in the second part of the invention.

Further, the electrical insulation strength (or voltage resistance) between the first metal layer and the second metal layer in the cut edge is greater than 1000 volts, preferably greater than 1800 volts, and more preferably greater than 2500 volts. The electrical insulation strength is X volts, and the voltage of X volts is applied between the second metal layer and the first metal layer in the edge cut, so that short circuit, creepage or breakdown cannot occur.

Further, the electrical gap between the first metal layer and the second metal layer in the cut edge is greater than 2mm, preferably greater than 5 mm, and more preferably greater than 10 mm.

The material of the first metal layer is preferably aluminum foil, stainless steel foil or copper foil. The metal plastic composite film is preferably formed by laminating a first resin layer, a first metal layer and a second resin layer, which are sequentially stacked, that is, the metal plastic composite film is formed by laminating 3 layers described above. The metal plastic composite film is preferably an aluminum plastic composite film (aluminum plastic film for short). The second metal layer is preferably an aluminum layer or a stainless steel layer.

According to the invention, the first resin layer, the first metal layer, the second resin layer and the second metal layer are sequentially laminated, and the connection between the two adjacent layers can be directly compounded, or compounded through an adhesive, or compounded by hot melting or compounded in other modes.

The cut edge on the heat sealed side of the pouch cell is preferably sealed by an insulating film to avoid electrical communication or creepage of the first metal layer in the cut edge with the second metal layer, or the cut edge is preferably flanged to avoid electrical communication or creepage with the second metal layer.

Further, the second metal layer wraps the trimming edges and the insulating films outside the trimming edges. The second metal layer is electrically insulated from the first metal layer in the cut edge.

Preferably, the second metal layer wraps the edge cutting and the insulating film, the second metal layer extends to the outer side of the side edge of the soft package battery, and the two second metal layers on the outer side of the side edge of the soft package battery are connected with each other (preferably in a bonding mode) to form a seal.

Or the metal plastic composite film wrapping the soft package battery is bonded with the second metal layer through an adhesive.

Preferably, the second metal layer is back glued inside so as to make the second metal layer fit well with the metal plastic composite film.

The first resin layer and the second resin layer are each a single resin layer or a multilayer resin layer. The first resin layer and the second resin layer are each preferably an electrically insulating material such as polypropylene PP, nylon, PET, polyimide, or the like. The first resin layer typically comprises a heat-sealable layer, such as a PP layer.

According to the soft package battery, the edge cutting of the metal plastic composite film is subjected to insulation treatment so as to prevent the first metal layer from being exposed. The insulation treatment mode is preferably to adopt insulation film sealing and wrapping; or, the insulation treatment mode is preferably to fold the heat-sealed side edges of the soft package battery to prevent the first metal layer from being exposed.

In the pouch battery, the second metal layer and the second resin layer are bonded by using an adhesive resin.

In the pouch battery as described above, the adhesive resin is coated on the second metal layer in advance, or coated on the outer surface of the second plastic layer in advance. For example, an aluminum foil tape is used as the second metal layer to wrap the aluminum plastic film.

Laminate sealedly each other with the second metal level, laminate sealedly around the laminate battery that lie in laminate battery front and back two sides, extend two-layer outside laminate battery side.

The invention also provides a cooling device for the soft package battery, which comprises the following components: the utility model provides a laminate polymer battery cooling device, its includes laminate polymer battery and coolant liquid, and this laminate polymer battery is wrapped up by soft packaging material, wraps up laminate polymer battery's soft packaging material and coolant liquid direct contact heat transfer. The flexible packaging material comprises (or is sequentially laminated with) a first resin layer, a first metal layer and a second resin layer, and the flexible packaging material also comprises a second metal layer which is wrapped outside the second resin layer. The second metal layer is in direct contact with a cooling liquid.

The first metal layer and the second metal layer are electrically insulated and have an insulation strength of greater than 1800 volts. The first metal layer and the second metal layer are preferably electrically insulated from each other by an insulating film or a folded edge.

The soft packing material of the invention has easy deformation performance relative to the hard shell outside the square hard shell battery. The flexible packaging material of the invention can be a metal plastic composite film (such as an aluminum plastic film) or a metal foil such as an aluminum foil. The aluminum foil can be 200-300 microns aluminum foil, and can also be aluminum foil within 200 microns. The aluminum foil has the characteristic of easy deformation, and is different from an aluminum shell outside a square aluminum shell battery. The layers in the flexible packaging material can be formed by one-time compounding or can be formed by multiple times of compounding. The multiple compounding can be performed by firstly wrapping the battery cell by the aluminum-plastic film to form a primary soft package battery, and then wrapping the primary soft package battery by the second metal layer to form the soft package battery.

A soft package battery cooling device comprises a soft package battery and cooling liquid, wherein the outside of an electric core of the soft package battery is wrapped by a metal plastic composite film, the metal plastic composite film comprises a first metal layer, the soft package battery is provided with a heat-sealing top edge and a heat-sealing side edge, the heat-sealing side edge is provided with a cutting edge, and the cutting edge is provided with the first metal layer; and a second metal layer is wrapped outside the metal plastic composite film, the cutting edge and the second metal layer are electrically insulated or subjected to electrical insulation treatment, and the second metal layer is in direct contact with cooling liquid.

The utility model provides a laminate polymer battery cooling device, this cooling device contains coolant liquid and any kind of above-mentioned laminate polymer battery, the outer second metal level of laminate polymer battery and the heat transfer of coolant liquid direct contact.

In the present invention, the coolant is preferably an antifreeze coolant (or antifreeze) containing ethylene glycol and water.

The trimming of the metal plastic composite film refers to the trimming of the heat-sealed edge of the soft package battery (namely the trimming of the heat-sealed top edge or the heat-sealed side edge). The cut edge includes a resin layer (e.g., a PP layer) and a first metal layer. The cut edge is the cross section of a hot-sealed edge of a two-layer metal plastic composite film (such as a traditional aluminum plastic film) after hot sealing.

For clarity and convenience, the invention is illustrated as follows: the heat-sealing edges of the soft package battery are divided into a top heat-sealing edge (top edge for short) and a side heat-sealing edge (side edge for short), and sometimes have a heat-sealing bottom edge.

The technical scheme of the invention can solve the long-term insulation problem of the power soft package battery in cooling water in the prior art, ensure that the insulation strength and the leakage current between the cooling liquid and the positive and negative electrodes of the battery core meet the standard requirements of the prior art (such as the insulation strength is more than 1800 volts and the insulation resistance is more than 100 ohms/volt), and solve the insulation problem of a vehicle in a long-term (such as more than 10 years) operation process.

The thickness of the aluminum foil in the aluminum foil tape is preferably 40 to 200 micrometers.

The scope of the present invention also includes various possible combinations of the above aspects or features. The present invention is not described in detail herein.

Third part

The third part of the invention provides the following sealing frame scheme of the soft-package battery and the technical scheme of the soft-package battery module:

a pouch cell sealing frame comprising a pi or □ type configuration, said sealing frame comprising one or two frame top edges and further comprising one or two frame side edges. Wherein pi or □ is substantially or substantially shaped.

According to the sealing frame, the top edge of the frame and the side edges of the frame form sealing surfaces with the sealing edge of the soft package battery, so that the cutting edge on the sealing edge of the soft package battery is isolated from the cooling liquid.

The sealing frame mainly plays a role in sealing the sealing edge of the soft package battery, and prevents cooling liquid from leaking outside through the sealing edge or permeating into the battery cell through the trimming edge of the sealing edge. Further, the sealing frame can also play a role in supporting and fixing the soft package battery.

And the top edge of the frame is attached to the top edge of the soft package battery and used for sealing the top edge of the soft package battery. The frame side is laminated with the laminate polymer battery side for sealed laminate polymer battery side.

The invention provides a soft-package battery submodule (or called a submodule) which comprises a laminated body formed by laminating two (or more) soft-package batteries together and an anticorrosive layer wrapped outside the laminated body. The anticorrosive coating can prevent the cooling liquid from corroding, permeating and contacting the soft package battery. Preferably, the sub-module of the soft package battery further comprises an elastic material (preferably elastic foam) sandwiched between the two soft package batteries, and the elastic material can buffer the volume change of the batteries when the batteries expand.

The anticorrosive layer may be directly or indirectly wrapped on the outer side of the laminate (indirect wrapping means that another layer is further wrapped between the anticorrosive layer and the laminate).

The corrosion protection layer preferably comprises a metal layer.

As an example, the corrosion-resistant layer is preferably an aluminum foil layer or an aluminum-plastic composite film.

The electric clearance between the anticorrosive layer and the edge of the sealing edge of the soft package battery is more than 2mm, and more preferably more than 5 mm. One of the characteristics of the invention different from the prior art is that the anticorrosion layer for blocking water permeation and corrosion is placed on the finished product battery core and then wrapped, and the problems of insufficient insulation strength and insufficient electrical clearance between the anticorrosion layer and the aluminum plastic film trimming edge are creatively solved.

The invention provides a soft-package battery module which comprises soft-package battery sub-modules and a partition plate which are sequentially stacked, wherein a fluid channel for flowing cooling liquid is formed between the soft-package battery sub-modules and the partition plate.

Preferably, a sealing structure is arranged between at least three of the four sides of the separator and the anticorrosive layer outside the soft-package battery on two sides of the separator, or a sealing structure is arranged, and the cooling liquid flows in the sealing structure.

The invention provides a soft package battery module, which comprises a plurality of soft package batteries and a plurality of sealing frames, wherein each sealing frame comprises a plurality of frame edges, and each soft package battery comprises a plurality of sealing edges (edge sealing for short); the frame sides of the two adjacent sealing frames clamp the sealing sides of the soft package battery, and the frame sides and the sealing sides of the soft package battery form a sealing interface. When the soft package battery is charged and discharged or the module is assembled on a whole vehicle, the module also contains cooling liquid; laminate polymer battery body and coolant liquid direct contact heat transfer (or the outmost wrapping material and the coolant liquid direct contact heat transfer of parcel laminate polymer battery body, or the outmost and the coolant liquid direct contact heat transfer of the wrapping material of parcel laminate polymer battery body). The frame edge and the sealing edge of the soft package battery form a sealing interface, so that the cooling liquid which is in direct contact with the soft package battery body for heat exchange can be sealed to avoid the cooling liquid from overflowing or flowing outwards from the sealing edge; thereby avoiding the contact of the cooling liquid with the edge cutting on the edge sealing of the battery and also avoiding the contact of the cooling liquid with the positive and negative electrodes of the battery.

The frame side may be the top frame side, or the side frame side, or the bottom frame side (if any).

The sealing edge of the soft package battery can be the sealing top edge, the sealing side edge or the sealing bottom edge (if the sealing top edge, the sealing side edge or the sealing bottom edge). The sealing edge can be sealed by heat sealing or adhesive sealing. These sealing edges have an open cut edge with a sealant (which may be a heat seal resin or adhesive) therein which, if exposed to a coolant (i.e., the cut edge is in direct contact with the coolant), tends to cause the coolant to slowly infiltrate from the sealant in the cut edge, thus forming a sealing interface with the pouch cell sealing edge through the frame edge to physically isolate all cut edges from the coolant. The power pouch cell typically has 4 sides, which are divided into a sealing side and a crimping side. There is no cut edge on the hem, and there is a cut edge on the sealed edge. The soft package battery can have 4 sealing edges, and also can have 3 sealing edges and 1 folding edge.

Preferably, the sealing interface according to the present invention can withstand a hydraulic pressure of the cooling fluid at a relative pressure of 1bar or more (more preferably 5bar or more) so that the cooling fluid contacting the battery body does not leak from the side of the battery body to the other side of the sealing interface through the sealing interface.

The invention also provides a soft package battery module, which comprises a plurality of soft package batteries and a plurality of sealing frames which are stacked; the sealing frames comprise top edges of the frames and side edges of the frames positioned on one side or two sides of the top edges of the frames, the top edges of the soft package batteries are arranged between the top edges of the frames of the two adjacent sealing frames, and the top edges of the frames and the top edges of the soft package batteries form sealing interfaces; laminate polymer battery's side is set up between two adjacent sealed frame's frame side, and the frame side forms sealed interface with laminate polymer battery's side. When the soft package battery is charged and discharged or the module is assembled on a whole vehicle, the module also contains cooling liquid; laminate polymer battery body and coolant liquid direct contact heat transfer (or the outmost wrapping material and the coolant liquid direct contact heat transfer of parcel laminate polymer battery body, or the outmost and the coolant liquid direct contact heat transfer of the wrapping material of parcel laminate polymer battery body).

The invention also provides another battery module, which comprises a plurality of batteries and a plurality of sealing frames which are stacked; the sealing frame comprises a frame top edge and a frame side edge positioned on one side or two sides of the frame top edge, a sealing interface is formed between the frame top edge of the sealing frame and the battery, and a sealing interface is formed between the frame side edge of the sealing frame and the battery. The battery is preferably a pouch battery. When the soft package battery is charged and discharged or the module is assembled on a whole vehicle, the module also contains cooling liquid; the laminate polymer battery body and the coolant liquid direct contact heat transfer (or the outmost wrapping material and the coolant liquid direct contact heat transfer of parcel laminate polymer battery body, or the outmost and the coolant liquid direct contact heat transfer of the wrapping material of parcel laminate polymer battery body).

The invention also provides a battery module, which comprises a plurality of batteries which are stacked and cooling liquid channels among the batteries, wherein the batteries are wrapped by insulating layers, the insulating layers are wrapped by anticorrosive layers, and at least three peripheries of the anticorrosive layers among the adjacent batteries are provided with sealing structures which can enable cooling liquid to circulate in the cooling liquid channels among the adjacent batteries without leaking to the outside of the sealing structures.

The anti-corrosion layer is preferably a metal layer or a metal plastic composite film.

The sealing structure can be formed by coating sealing glue on the periphery between the batteries or arranging sealing rubber strips on the periphery between the batteries.

The invention also provides another soft package battery module which comprises a plurality of soft package battery cells and cooling liquid, wherein the soft package battery module is constructed in such a way that at least part of the body of the soft package battery cell is in contact with the cooling liquid, and the edge of the hot edge sealing of the soft package battery cell is not in contact with the cooling liquid.

The invention also provides the following series of schemes A, including schemes A1-A3:

a1: a battery module comprises a plurality of soft package battery cores and cooling liquid,

it is configured (with the following structure and function): at least part of the outmost layer of the packaging material on the soft-package battery cell body is in direct contact with the cooling liquid for heat exchange, and the edge cutting on the edge sealing of the soft-package battery cell is not in contact with the cooling liquid.

A2: the utility model provides a seal structure that is arranged in soft-packaged electrical core module coolant liquid, its characterized in that, this seal structure make outmost at least part and the coolant liquid direct contact heat transfer of packaging material on the soft-packaged electrical core body, and the side cut contactless coolant liquid on the soft-packaged electrical core banding.

A3: a battery coolant sealing structure comprises a plurality of soft package battery cores and coolant,

its sealing interface is set up between the at least part of soft-packaged electrical core body and the side cut on the soft-packaged electrical core banding, so that the outmost at least part and the coolant liquid direct contact heat transfer of packaging material on the soft-packaged electrical core body, and the side cut on the soft-packaged electrical core banding contactless coolant liquid.

Namely, the first metal layer in the edge cut on the cell edge sealing is not in contact with the conductive cooling liquid and cannot be electrically communicated.

The invention also provides the following series of schemes B, which comprise B1-B5:

scheme B1: the utility model provides a battery module, its includes a plurality of laminate polymer core and coolant liquid, laminate polymer core is packed by the plastic-aluminum membrane, contain first metal level in the plastic-aluminum membrane of laminate polymer core still wraps up the inoxidizing coating outward, the coolant liquid can lead, and it is constructed (possesses the structure of following function): the at least part of the protective layer used for wrapping the soft package battery cell is in direct contact heat exchange with the conductive cooling liquid, and the insulation strength between the first metal layer in the aluminum plastic film of the soft package battery cell and the conductive cooling liquid is greater than 2000 volts.

The protective layer is used for isolating the aluminum plastic film and the cooling liquid of the soft package battery cell.

The invention also provides any battery module of the scheme A1-A3, which also has all the technical characteristics of the scheme B1.

Scheme B2: further according to scheme B1, the protective layer includes a second metal layer, and the electrical insulation strength between the first metal layer and the second metal layer lasts for more than 5 years and is greater than 2000 volts.

Scheme B3: further based on scheme B1, an electrical gap between the first metal layer and the second metal layer is greater than 2 millimeters.

Scheme B4: further based on the scheme B1, the battery module is also provided with the technical characteristics as described in the scheme A1, A2 or A3.

Namely, the scheme B4 includes: the invention also provides a battery module, which comprises a plurality of soft package battery cores and cooling liquid, wherein the soft package battery cores are packaged by aluminum plastic films, the aluminum plastic films of the soft package battery cores comprise first metal layers, the aluminum plastic films of the soft package battery cores are also wrapped by protective layers, the cooling liquid can conduct electricity, and the battery module is constructed into a structure (with the following functions): at least part of the protective layer used for wrapping the soft package cell is in direct contact with the conductive cooling liquid for heat exchange, and the insulation strength between the first metal layer in the aluminum-plastic film of the soft package cell and the conductive cooling liquid is greater than 2000 volts;

the battery module is also configured to have a sealing structure: its sealing interface is set up between the at least part of soft-packaged electrical core body and the side cut on the soft-packaged electrical core banding, so that the at least part and the coolant liquid direct contact heat transfer of the inoxidizing coating on the soft-packaged electrical core body, and the side cut on the soft-packaged electrical core banding contactless coolant liquid.

Scheme B5: a soft package battery module comprises a plurality of soft package battery cells and cooling liquid, wherein the soft package battery cells are packaged by aluminum plastic films, each aluminum plastic film comprises a first aluminum foil layer, a second plastic insulating layer wraps the outside of each aluminum plastic film of each soft package battery cell, and a second aluminum foil protective layer wraps the outside of each second plastic insulating layer; the soft package battery module is constructed into a structure with the following functions: at least part of the second aluminum foil protective layer is in direct contact with a cooling liquid for heat exchange, and the electric insulation strength between the first aluminum foil layer and the second aluminum foil protective layer in the aluminum-plastic film is greater than 2000 volts; and/or the electric gap between the first aluminum foil layer and the second aluminum foil protective layer is larger than 2 mm.

Before the soft package battery core is wrapped, the aluminum-plastic film is separated from the second plastic insulating layer.

The invention also provides another soft package battery module, which comprises a plurality of soft package batteries and a plurality of sealing frames which are stacked; the module also contains cooling liquid; the edge cutting on the sealing side edge of the soft package battery is sealed between the frame side edges of two adjacent sealing frames, so that the edge cutting on the sealing side edge is isolated from the cooling liquid; the body of the soft package battery directly contacts with the cooling liquid for heat exchange. This avoids direct contact of the cutting edges with the cooling liquid.

The invention also provides another battery (preferably a soft package battery) module, which comprises a plurality of soft package battery packs and a plurality of sealing frames which are arranged in a stacked mode; the sealing frame comprises a frame top edge and frame side edges positioned on one side or two sides of the frame top edge, the top edge of the soft package battery pack is arranged between the frame top edges of the two adjacent sealing frames, and the frame top edge and the top edge of the soft package battery pack form a sealing interface. As a further preferred scheme, the side of laminate polymer battery module is set up between two adjacent sealed frame's frame sides, and the frame side forms sealed interface with the side of laminate polymer battery group.

Wherein, laminate polymer battery group includes two or more laminate polymer battery, two or more laminate polymer battery outer (or laminate polymer battery group outer) parcel have waterproof membrane or waterproof foil (waterproof foil is preferred aluminium foil). The soft-package battery pack is preferably clamped with a fireproof layer or/and a foam layer.

For example, two soft-package batteries sandwich a foam layer to form an intermediate body, and an aluminum foil layer is wrapped outside the intermediate body to serve as an anticorrosive layer. When having the coolant liquid to pass through in the laminate polymer battery module, this anticorrosive coating and coolant liquid contact, the last plastic layer of laminate polymer battery and coolant liquid contactless.

Wherein, the topside of laminate polymer battery group by laminate together and parcel waterproof membrane or waterproof foil form two or more laminate polymer battery's topside, laminate polymer battery's side by two or more laminate polymer battery's side is laminated together and parcel waterproof membrane or waterproof foil form.

The invention also provides another square metal hard-shell battery module, which comprises a plurality of metal hard-shell batteries arranged in a stacked mode, wherein the metal hard-shell batteries are wrapped by an insulating layer, a waterproof layer (the waterproof layer preferably comprises an aluminum foil layer) is wrapped on the insulating layer, and a cooling liquid channel is further arranged in the module and is arranged between every two adjacent metal hard-shell batteries. Preferably, the insulation strength between the metal hard shell and the waterproof layer is more than 1000V, and further more than 2000V.

Preferably, the creepage distance between the metal hard shell and the waterproof layer is more than 2mm, further more than 4 mm.

Preferably, the metal hard-shell battery is a blade battery.

The pouch battery module as described above, further, the sealing frame has a frame top edge and two frame side edges, and the frame side edges are located on two sides of the frame top edge. Still further, the sealing frame also has a frame bottom edge located on the side of the frame side opposite the frame top edge.

Or further, the sealing frame has two frame top edges and one frame side edge, the frame side edges being located on the same side of the frame top edges.

Or further, the sealing frame has two frame top edges and two frame side edges, the frame side edges being located on both sides of the frame top edges.

Or further, the sealing frame has two frame top edges and one or two frame side edges, the two frame top edges being connected to each other, the frame side edges being located at the sides or opposite the frame top edges.

The top edge or the side edge of the soft package battery is formed by heat sealing to form a heat-sealed top edge or a heat-sealed side edge; the top edge or the side edge may also be bonded by an adhesive to form a sealed top edge or a sealed side edge.

Further, if laminate polymer battery has the heat-seal base, then sealed frame still has a frame base, and this laminate polymer battery's heat-seal base is set up between two adjacent sealed frame's frame base, and frame base and laminate polymer battery's base form sealed interface.

The sealing frame and the pouch battery heat-sealing edge form a sealing interface, the pouch battery has a heat-sealing top edge and a heat-sealing side edge, and correspondingly, the sealing frame has a frame top edge and a frame side edge with corresponding structures and numbers. Of course, the sealing frame may also have a frame bottom edge as desired.

Further, above-mentioned laminate polymer battery module is still including the baffle, the module includes a plurality of laminate polymer batteries, a plurality of sealing frame and a plurality of baffle that pile up the setting, the baffle is used for separating the laminate polymer battery of this baffle both sides and forms the runner, the coolant liquid flow in the runner that forms and with laminate polymer battery body direct contact heat transfer.

Preferably said sealing frame comprises a pi-shaped or □ -shaped configuration, said sealing frame comprising one or two frame top edges and further comprising two or one frame side edges. Wherein the II type (abbreviated as 'Pi' type) or □ type (abbreviated as 'kou' type) is roughly shaped (or basically II type or □ type). And the top edge of the frame is attached to the top edge of the soft package battery and used for sealing the top edge of the soft package battery. The frame side is laminated with the laminate polymer battery side for sealed laminate polymer battery side.

Frame topside and laminate polymer battery's heat-seal topside forms sealed interface, can be so that the coolant liquid with laminate polymer battery body direct contact heat transfer is sealed in order to avoid the coolant liquid to spill over outwards from this heat-seal topside.

The frame side forms sealed interface with laminate polymer battery's heat-seal side, can make the coolant liquid sealed in order to avoid the coolant liquid to outwards spill over from this heat-seal side, and/or can make the coolant liquid sealed in order to avoid the coolant liquid to contact with laminate polymer battery's side cut. The step of avoiding the contact of the cooling liquid with the edge cutting of the soft package battery refers to the step of avoiding the direct contact of the cooling liquid with the edge cutting of the soft package battery or the step of avoiding the contact of the cooling liquid with the edge cutting of the soft package battery after the cooling liquid penetrates through other substances. The trimming of the soft package battery refers to the trimming of a hot edge sealing or a sealing edge of the soft package battery. The cut edge typically includes a non-metallic resin layer or adhesive layer in cross-section.

Wherein "sealing the cooling liquid" is also understood as "such that the cooling liquid cannot flow through the sealing interface" or "such that the cooling liquid does not penetrate through the sealing interface towards the other side". The laminate polymer battery body refers to the portion that the parcel that swells has positive negative pole utmost point core on the laminate polymer battery, and the electric core of its inside parcel can produce the heat at the during operation, needs the cooling. At least part of the body of the soft package battery is soaked in the cooling liquid to exchange heat with the cooling liquid.

The soft-package battery is in direct contact with the cooling liquid, namely the outer packaging material wrapping the soft-package battery is in direct contact with the cooling liquid. The outer packaging material for wrapping the soft package battery comprises a packaging material for directly wrapping the battery core, and also comprises a packaging material for secondary wrapping (or indirect wrapping). When the pouch battery has a secondary wrapping (or indirect wrapping) packaging material, the expression "the pouch battery body is in direct contact with the coolant" means that the packaging material for the secondary wrapping (or indirect wrapping) on the pouch battery body is in direct contact with the coolant. By a secondary-wrapped (or indirectly wrapped) material is meant a packaging material that wraps the material outside a pouch cell that already has an outer packaging material (primary wrapping material). The pouch battery having a secondary coating, which is in direct contact with a coolant, means that the secondary coating material is in direct contact with the coolant. The secondary packaging is a generic term, and includes multiple packaging such as secondary or more packaging. The soft package battery is preferably wrapped by an aluminum-plastic composite film.

Definition of the top edge of the pouch cell: the battery is characterized in that a sealing edge extending out of a tab is arranged on the soft package battery. The pouch cell has one top edge or two top edges.

According to the arrangement form of the positive and negative electrode lugs of the soft package battery, the soft package battery can be divided into two types: type a and type B. The A-type soft package battery means that the positive and negative electrode tabs are led out from the same hot sealing edge. The B-type soft package battery refers to that the positive and negative electrode tabs are led out from two opposite sides by heat sealing. The heat-sealing edge with the tab extending out is defined as the top edge, so that the A-type battery cell only has 1 top edge; the type B cell has two top edges (a first top edge and a second top edge).

The soft package battery can be provided with 1 top heat sealed edge (A type soft package battery), namely, the positive and negative lugs of the soft package battery extend outwards from the top heat sealed edge; the laminate polymer battery can also have 2 hot sealed edges (B type laminate polymer battery), namely the positive and negative ears of the laminate polymer battery are respectively extended outwards by two opposite hot sealed edges.

For the A-type soft package battery, the side opposite to the top side is the bottom side, and the bottom side can be a heat-sealed side or a folded side (the folded side does not need heat sealing and has no cut edge).

For the type B pouch battery, if the type B pouch battery has only 1 heat-sealed side edge, the bottom edge refers to the side without the heat-sealed edge and the cut edge. If a B-cell has 2 heat-sealed sides, the B-cell will have no bottom.

The soft package battery can be provided with 3 heat sealing edges (or sealing edges) and 1 folded edge which is folded without heat sealing; there may also be no hem, i.e. 4 sides are both heat sealed or sealed.

The cut edge (also referred to as cut surface) in the present invention refers to a cross-section of the outermost edge of the heat-sealed edge, typically the middle most portion of the cross-section being a polypropylene layer.

As above laminate polymer battery module, further, frame side inboard and laminate polymer battery's heat-seal side forms sealed interface.

According to the soft package battery module, a sealing interface is formed between the outer sides of the side edges of two adjacent frames. The sealing interface can enable the edge cutting of the soft package battery to be sealed in the frame, so that the direct contact between the edge cutting and the outside air or cooling liquid is avoided.

The soft package battery module further has one or more technical characteristics of the following a) -i):

a) and a sealant is also arranged between the two adjacent sealing frames and seals the cut edges of the heat-sealing side edges in the frame side edges.

b) The sealing frame comprises a sealing frame framework and an elastic sealing element, and the sealing frame frameworks of two adjacent sealing frames clamp the elastic sealing element and the heat-sealing side edge of the soft package battery, so that the trimming edge of the heat-sealing side edge is sealed in the frame side edge. Thus, the cutting edge is fully contained within the resilient seal. This prevents the coolant on either side of the elastomeric seal from coming into direct contact with the cutting edges.

c) Sealing frame includes sealing frame skeleton and elastic sealing element, and two adjacent sealing frame's sealing frame skeleton presss from both sides tight elastic sealing element and laminate polymer battery's heat-seal side to make the side cut of heat-seal side sealed outside the frame side, thereby make coolant liquid with laminate polymer battery body direct contact and this side cut physics keep apart. Thus, the cutting edge and the cooling liquid are respectively positioned at two sides of the side edge of the frame.

d) The sealing frame includes a frame top edge and frame side edges on opposite sides of the frame top edge.

e) And the two sides of the bottom edge of the frame are connected with the side edges of the frame at the two sides or connected with the top edges of the frame at the two sides.

f) The soft package battery comprises a bottom thermal sealing edge, namely a bottom sealing edge, and the edge of the bottom sealing edge of the soft package battery is sealed between the bottom edges of the frames of the two adjacent sealing frames.

g) The sealing mode is adhesive sealing or sealing by a sealing gasket on a sealing frame.

h) The sealing frame includes a first frame top edge and a second frame top edge, and one or two frame side edges, either extending from a side of the first frame top edge to the second frame top edge.

i) And one of the two adjacent sealing frames is provided with a concave sealing surface, the other sealing frame opposite to the one sealing frame is provided with a convex sealing surface, and the concave sealing surface and the convex sealing surface are matched to seal.

According to the soft package battery module, the side edges or the bottom edges of the sealing frames are provided with the cavities, or the cavities are formed between the side edges or the bottom edges of the two adjacent sealing frames, and the cavities are used for the inflow or outflow of cooling liquid. More specifically, a cavity is formed on the side edge or the bottom edge of the sealing frame on two adjacent sides of the partition plate, or a cavity is formed between the side edge or the bottom edge of the sealing frame on two adjacent sides of the partition plate, and the cavity is used for the inflow or outflow of the cooling liquid.

Another pouch battery module as set forth above, the sealing frame does not have a bottom side (e.g., the sealing frame has a pi-shaped structure), and the coolant flows in or out from the partition plate between the bottoms of the adjacent pouch batteries.

Like above-mentioned laminate polymer battery module, it is further, the module still includes the coolant liquid container, laminate polymer battery and sealing frame place in this container.

As before mentioned laminate polymer battery module, it is further, the module still includes the bottom plate, the bottom plate forms sealedly with sealed frame bottom (like II type sealed frame's opening side), laminate polymer battery module bottom or the bottom plate has the entry and the export of coolant liquid.

In the pouch battery module as described above, the remaining parts (including the cut edge of the pouch battery, the resin layer or the adhesive layer in the middle of the flexible packaging material, and the sealant layer or the resin layer for bonding the outermost wrapping material) of the pouch battery are not in contact with the coolant, except for the outermost wrapping material of the pouch battery which is in contact with the coolant. Wherein, the outermost wrapping material can also be the outermost layer of the wrapping material.

Tightly binding the sealing frames by using binding bands outside the soft package battery module, or tightly fastening the sealing frames by using through bolts; so that the sealing between two adjacent sealing frames for clamping the heat-sealed edge of the soft-package battery is good.

The top edge of the frame of the sealing frame refers to the edge on the sealing frame attached to the top edge of the soft-package battery, and the side edge of the frame of the sealing frame refers to the edge on the sealing frame attached to the side edge of the soft-package battery. Of course, the sealing frame may also have 1 frame bottom edge, which corresponds to the bottom edge of the pouch cell.

Further, the weight of a single above-mentioned sealing frame is preferably 1.5 g to 9995 g.

Further, the thickness of a single above-mentioned sealing frame is preferably 0.3 mm to 95 mm.

Furthermore, the battery is a soft package battery or a hard shell battery, and the soft package battery is preferably a soft package lithium battery.

Furthermore, the material of the sealing frame of the present invention is preferably a sealing frame containing plastic.

The battery in the scheme has a positive electrode metal foil and a negative electrode metal foil, and the thickness of the positive electrode metal foil is preferably 3.1-49 micrometers. The thickness of the negative electrode metal foil in the battery is preferably 3.3-47 microns

The present invention also provides a method of manufacturing a battery module, including:

providing a sealing frame comprising a sealing edge (the sealing edge comprising a sealing top edge and a sealing side edge);

providing a soft package battery, and laminating the sealed edge of the soft package battery to the sealed edge of the sealing frame;

providing another sealing frame, and laminating the sealing edge of the other sealing frame to the edge sealing of the soft package battery;

repeating the laminating process of the soft package batteries and the sealing frames until battery modules of the soft package batteries with required number are obtained;

and a sealant is coated between the sealed edge of the soft-package battery and the sealed edge of the sealing frame, so that a sealing surface is formed between the sealed edge of the sealing frame and the sealed edge of the soft-package battery. The pouch cell according to claim or this embodiment may also include a pouch cell submodule containing more than 1 pouch cell.

providing a plurality of sealing frames and a plurality of soft package batteries, wherein the sealing frames are provided with sealing edges, and the soft package batteries are provided with sealing edges;

the sealing frame and the soft package battery are stacked in sequence, so that the sealing edge of the sealing frame and the edge sealing of the soft package battery form sealing.

In the above method, the method for forming the seal is preferably to coat a sealant or arrange a sealing gasket on the sealing edge of the sealing frame and the edge sealing of the pouch battery. And sealing the cooling liquid after the seal is formed, so that the cooling liquid flowing on the surface of the soft package battery body is not contacted with the cut edge.

The module can be a standard module or a whole battery pack. Preferably, the entire battery pack consists of only one large module.

The coolant according to the present invention may be any of various liquid media, preferably water, an antifreeze solution containing ethylene glycol and water, or a lubricating oil.

The thickness of the soft package battery body is preferably 2.7-43 mm.

Preferably, in the third aspect of the present invention, the battery module further includes a temperature sensor. The temperature sensor is used for measuring the temperature of the battery or the cooling liquid in the module.

The soft-package battery module can also be called a soft-package battery module. The scope of the present invention also includes various possible combinations of the above aspects or features. The present invention is not described in detail herein.

In the present invention, when the following schemes refer to the preceding schemes, the following schemes contain sub-schemes referring to the possible preceding schemes. Referring to scheme 1 as scheme 2, including referring to scheme 1 and its possible sub-schemes.

Fourth section

The invention also provides the following scheme of the soft-package battery module: the pouch battery module according to any of the above third aspect of the pouch battery module solutions, wherein the pouch battery is any of the above second aspect of the pouch battery solutions. Specifically, the following schemes are included, by way of example only, as follows:

a soft package battery module comprises a plurality of soft package batteries and a plurality of sealing frames which are arranged in a stacked mode; the sealing frames comprise frame top edges and frame side edges positioned on one side or two sides of the frame top edges, the top edges of the soft package batteries are arranged between the frame top edges of the two sealing frames, and at least one side of the top edges of at least one frame and at least one side of the top edges of the soft package batteries form a sealing interface; laminate polymer battery's side is set up between two sealing frame's frame side, and at least one side of at least one frame side and at least one side of laminate polymer battery's side form sealed interface. When the soft package battery is charged and discharged or the module is assembled on a whole vehicle, the module also contains cooling liquid; the soft-package battery body is directly contacted with the cooling liquid for heat exchange (or a wrapping material wrapping the outermost layer of the soft-package battery body is directly contacted with the cooling liquid for heat exchange); the soft package battery comprises a battery core, a metal plastic composite film (an aluminum plastic film or a steel plastic film) and a flexible package battery, wherein the battery core of the soft package battery is wrapped with the metal plastic composite film (the aluminum plastic film or the steel plastic film), the metal plastic composite film comprises a first metal layer (an aluminum layer or a steel layer), the soft package battery is provided with a heat-sealed top edge and a heat-sealed side edge, the heat-sealed side edge is provided with a cutting edge, and the cutting edge is provided with the first metal layer; the metal plastic composite film of the soft package battery is further wrapped with a second metal layer (an aluminum layer or a steel layer) or wrapped with a metal foil adhesive tape (such as an aluminum foil adhesive tape, a copper foil adhesive tape or a stainless steel foil adhesive tape), the second metal layer is electrically insulated or subjected to electrical insulation treatment with the first metal layer in the edge cutting, so that the second metal layer is electrically insulated with the first metal layer. When the laminate polymer battery body soaks in the coolant liquid or when laminate polymer battery body and coolant liquid heat transfer, second metal level and coolant liquid direct contact. And the sealing frame and the second metal layer form a sealing interface, so that the metal plastic composite film is not in contact with the cooling liquid.

The present invention also provides scheme C: the battery module of the scheme C has all the technical features of the scheme a and the scheme B at the same time.

The invention also provides the following scheme:

scheme C1: a soft package battery module comprises a plurality of soft package battery cores and cooling liquid, wherein the soft package battery cores are packaged by an aluminum plastic film, the aluminum plastic film comprises a first aluminum foil layer, the aluminum plastic film further comprises a plastic layer laminated on the outer side of the first aluminum foil layer, the outer part of the aluminum plastic film is at least wrapped by a second protective layer, and the second protective layer comprises a second aluminum foil protective layer; the soft package battery module is constructed into a structure with the following functions:

at least part of the second aluminum foil protective layer is in direct contact with a cooling liquid, and the electric insulation strength between the first aluminum foil layer and the second aluminum foil protective layer in the aluminum-plastic film is greater than 2000 volts; or/and the electric gap between the first aluminum foil layer and the second aluminum foil protective layer is larger than 2 mm; and the number of the first and second electrodes,

this battery module still has following seal structure, and its sealing interface is set up between the at least part of laminate polymer core body and the side cut on the laminate polymer core banding, so that outermost at least part and the coolant liquid direct contact of packaging material on the laminate polymer core body, and the side cut on the laminate polymer core banding contactless coolant liquid.

In the above, at least one insulating layer is sandwiched between the first aluminum foil layer and the second aluminum foil protective layer, and preferably, the distance between the edge of the first aluminum foil layer and the edge of the second aluminum foil protective layer is more than 2 mm; or preferably, the edge of the first aluminum foil layer is wrapped by an insulating material in a sealing manner, so that an electrical gap between the first aluminum foil layer and the second aluminum foil protective layer is infinite.

The second protective layer is internally provided with an adhesive layer in a measuring way, so that the second protective layer and the soft package battery core are well adhered and attached. The adhesive is preferably a pressure sensitive adhesive.

Scheme C2: according to the scheme C1, a second plastic insulating layer is further disposed between the aluminum-plastic film and the second aluminum foil protective layer, and the second plastic insulating layer wraps the pole core to form a soft-package battery core and then wraps the soft-package battery core again.

Scheme C3: further according to scheme C1 or C2, this laminate polymer battery module still includes a plurality of sealing frame, sealing frame includes sealing frame topside and sealing frame side, sealing frame topside and both sides form sealed face between the top banding of laminate polymer core, sealing frame side and both sides form sealed face between the side banding of laminate polymer core to make the coolant liquid with the outermost packaging material contact on the body of laminate polymer core and with the side cut contactless on the laminate polymer core banding.

The second protective layer of the invention is preferably wrapped in the soft-package cell for the second time after the pole core is wrapped in the aluminum plastic film to form the soft-package cell. The secondary wrapping of the invention means that the wrapping layer and the previous wrapping layer are wrapped respectively, but not wrapped together.

The function is as follows: this second aluminium foil inoxidizing coating can play moisture separation, heat conduction, soaking and electromagnetic shielding's effect, can also reduce the problem of the cost-push that the multilayer is compound to bring to and the bulging force of dispersion electricity core. The second aluminum foil protective layer is wrapped for the second time, so that the problems of electric gaps and insufficient insulation strength are solved.

Scheme C4 is according to any one of schemes C1-C3 above, and the pole piece of the soft package battery cell is manufactured by the lithium supplement method of scheme H below.

The invention also provides a manufacturing method of the battery module, and the scheme D is as follows: which comprises the following steps:

providing a plurality of soft package battery cores which are packaged by aluminum plastic films, wherein the aluminum plastic films comprise first aluminum foil layers;

providing a second protective layer, wherein the second protective layer comprises a second aluminum foil layer, the outside of the soft package battery cell is wrapped with the second protective layer, and the electrical gap between the second aluminum foil layer and the first aluminum foil layer in the aluminum-plastic film is larger than 2 mm; and

set up seal structure in this battery module to make outmost packaging material's on the laminate polymer battery core body at least part and coolant liquid contact, and the side cut on the laminate polymer battery core banding and coolant liquid contactless.

The invention also provides a scheme E of the rectangular aluminum hard shell battery module, which comprises a plurality of rectangular aluminum hard shell batteries and conductive cooling liquid, wherein a plastic insulating layer wraps the rectangular aluminum hard shell, an aluminum foil protective layer wraps the plastic insulating layer, and an electrical gap between the rectangular aluminum hard shell and the aluminum foil protective layer is larger than 2 mm; and the number of the first and second electrodes,

the battery module also comprises a sealing structure for sealing the cooling liquid, and the sealing surface of the sealing structure is arranged between at least part of the aluminum foil protective layer outside the rectangular aluminum hard shell battery and the edge of the aluminum foil protective layer, so that the cooling liquid is in direct contact with at least part of the aluminum foil protective layer and is not in contact with the plastic insulating layer. The sealing surface is preferably provided along said edge on said protective layer of aluminium foil. The sealing surface is preferably provided by means of a sealant.

Scheme E2, the rectangular aluminum hard-shell battery module according to scheme E, further wherein the rectangular aluminum hard-shell battery has a length of 600mm to 2500mm and a length/thickness ratio of between 23 and 208.

The technical scheme H is as follows: a lithium supplementing method for a pole piece of a pole core comprises the following steps:

compounding a first base material and a first lithium belt to form a first composite lithium belt, and forming barrier between the first lithium belt and a compounding device by adopting a second base material in the compounding process;

adjusting the temperature of the compounding device;

compounding the first composite lithium belt and a lithium pole piece to be supplemented to form a lithium supplementing composite pole piece, wherein the first base material in the first composite lithium belt is positioned on one side far away from the lithium pole piece to be supplemented in the compounding process;

and respectively stripping and winding the first base material from the lithium supplement composite pole piece, and forming the lithium supplement pole piece.

The technical scheme I is as follows: a battery module comprises a plurality of single batteries, wherein each single battery has a first size, and the first size is the maximum value of the distance between two parallel planes which virtually clamp the single batteries; at least one single battery satisfies: the first size is more than or equal to 600mm and less than or equal to 2500mm, and the magnetic pole comprises a shell and a pole core positioned in the shell.

The invention also provides a vehicle which is provided with any soft package battery module.

Further, the battery capacity of the soft package battery module in the vehicle is in the range of 1.6 kilowatt-hour to 980 kilowatt-hour. Further, the vehicle also comprises at least 2 airbags.

Drawings

Fig. 1 shows a schematic view of a pouch cell type a having a

body

13 and 1 top

heat seal edge

11 and 2 side heat seal edges 12 with cut edges 120 on the heat seal side edges 12.

Fig. 2 is a schematic diagram of a cross section (i.e., a cut edge) 120 of the heat-sealed edge of the pouch battery, which is sequentially stacked into a protective layer (e.g., nylon) 123, an aluminum layer 121, a heat-sealing layer (e.g., PP) 122, an aluminum layer 121, and a protective layer 123, wherein the PP layer is easily penetrated by moisture into the battery cell.

The model 3 □ sealing frame of fig. 3 includes 1

top frame edge

21 and 2 side frame edges 22 and 1 bottom frame edge 23.

Figure 4 a pi-shaped configuration of the sealing frame comprises 1 frame

top edge

21 and 2 frame side edges 22.

Fig. 5 shows a pouch battery module including a pouch battery 1, a sealing frame 2, and a coolant container 3.

Fig. 6 shows a pouch battery module inner core, which includes 14 pouch batteries, 21 sealing frames and 8 separators.

Fig. 7 laminate polymer battery 1 assembles in sealing frame 2, and utmost point ear 14 stretches out from the frame top limit, and wherein laminate polymer battery hot seal edge's side cut is placed in the centre of sealing frame side 22, and the inside and outside both sides of sealing frame side all soak in the cooling water, but laminate polymer battery's side cut and cooling water physical isolation.

Fig. 8 shows a B-type pouch battery (left view) and a sealing frame (right view) thereof, the pouch battery includes a first tab 141 and a second tab 142, and the first tab 141 and the second tab 142 are respectively located on two opposite sides of the pouch battery body 131.

Fig. 9 shows another pouch battery module, which includes a pouch battery 1B and a sealing frame 2B.

Fig. 10 is a schematic view of a pouch cell sub-module of the present invention; the left figure is two soft package batteries 1B and a piece of elastic foam 15 is clamped, and the left figure does not show an anticorrosive layer; the right drawing is a cross-sectional view of the soft package battery submodule in the thickness direction, and the soft package battery submodule is provided with two soft package batteries 1B, a piece of elastic foam 15 and an anticorrosive layer 16 wrapping the outer side of the soft package battery 1B.

Fig. 11 and 12 are schematic diagrams illustrating two measurement methods of the distance between the first metal layer and the second metal layer.

Detailed Description

Pouch battery cooling device embodiments

A soft-package battery cooling device comprises a soft-package battery and cooling liquid, wherein the soft-package battery is in direct contact with the cooling liquid for heat exchange; the soft package battery is wrapped by a soft package material, wherein the soft package material comprises a first resin layer (a polypropylene resin layer), a first metal layer (an aluminum alloy layer) and a second resin layer (a nylon layer and/or a PET layer); and a second metal layer (aluminum alloy layer) is wrapped on the outer side of the second resin layer. The edge cutting of the flexible packaging material is subjected to insulation treatment so as to prevent the first metal layer from being exposed. The insulation processing mode adopts insulation film sealing and wrapping; or the edge folding of the soft package battery is thermally sealed to prevent the first metal layer from being exposed. And the second metal layer is bonded with the second resin layer by using adhesive resin, and the adhesive resin is coated on the second metal layer in advance or coated on the second plastic layer in advance.

Laminate polymer battery module embodiment

Example 1

As shown in fig. 3, the pouch battery module is packaged by an aluminum plastic film, and includes 14 pouch batteries 1 (a-type pouch batteries) and a sealing frame 2, and a body 13 of the pouch battery 1 is immersed in a cooling liquid to directly contact the cooling liquid for heat exchange; the sealing frame 2 comprises a top edge 21 and side edges 22 at both sides of the top edge, the top edge 21 of the frame and the top edge 11 of the battery 1 form a sealing interface to seal the cooling liquid from overflowing; the inner sides of the side edges 22 of the sealing frame 2 form sealing interfaces with the side edges 12 of the battery 1, and the outer sides of the two adjacent frame side edges form sealing interfaces, so that the cooling liquid is sealed and isolated to avoid the contact of the cooling liquid with the cut edges of the soft package battery. The cooling liquid is an antifreeze liquid containing glycol and water. Between the laminate polymer battery and the module outside still is provided with 8 fins 4, and this fin is used for separating laminate polymer battery and forms the coolant liquid runner between laminate polymer battery. All there are 2 laminate polymer battery between per two fins 2 to guarantee that every laminate polymer battery has at least one face and the heat transfer of coolant direct contact.

Contain polymer polypropylene PP layer 122 on the side cut (cross section) of laminate polymer battery hot seal limit, the long-term aqueous vapor separation nature on this PP layer 122 is not very good, if arrange this PP layer in the cooling water with cooling water direct contact, the water in the cooling water will be through the inside hydrofluoric acid that generates with electrolyte reaction of PP layer trace infiltration electric core, so need avoid cooling water and battery side cut direct contact to extension battery life.

In the implementation, a sealant is arranged between two adjacent sealing frames and seals the edge of the soft package battery. Or the sealing frames are formed by integrating sealing frame skeletons (such as plastic pieces or metal pieces) and elastic sealing pieces (such as rubber pieces), and the sealing frame skeletons of two adjacent sealing frames clamp the elastic sealing pieces and the heat sealing edges on the side faces of the soft-package battery, so that the cutting edges of the soft-package battery are sealed in the elastic sealing pieces.

The sealing frame is of an □ -type construction and includes a frame top edge 21, a bottom edge 23, and left and right side edges 22. If the soft package battery comprises a bottom heat sealing edge, namely a heat sealing bottom edge, the trimming edge of the heat sealing bottom edge of the soft package battery is sealed between the bottom edges 23 of the two adjacent sealing frames.

Be provided with cavity 221 on the side of sealing frame, perhaps be formed with cavity 221 between adjacent sealing frame's the side, the cavity is used for the inflow or the outflow of coolant liquid to make coolant liquid flow through one side cavity after with laminate polymer battery body contact heat transfer, then flow through the other side cavity again.

The module further comprises a coolant container in which a sub-module consisting of the pouch cells and the sealing frame is placed, and the container is provided with an inlet and an outlet for cooling water (not shown in the figure).

The present invention is to be contrasted with a different sealing arrangement,

sealing mode A: only the top edge is sealed and the side edges are exposed to water.

The cost is higher, about 12 yuan

Poor reliability, easy slight leakage at the corners (2.5 bar pressure maintaining, leakage up to 120Pa @60 s), and high leakage probability (10 samples all have different leakage)

Poor process convenience (Assembly time about 1 hour)

The water vapor permeability is 0.018 g/24h, the water vapor permeability is large, the side edge water seepage is realized, and the water vapor permeability is large.

Sealing mode B: sealing all heat-sealing edges of the battery cell by adopting EPDM rubber sealing strips

Moderate cost, about 8 yuan

Poor reliability, difficult sealing at the interface (2.5 bar hold pressure, leakage 20Pa @60 s), high probability of leakage (2 out of 10 samples with different leakage)

Moderate process convenience (assembly time about 22 minutes)

The water vapor permeability is 0.006 g/24h, and the water vapor permeability is small.

And (3) a sealing mode C: sealing all the heat-sealing edges of the battery cell by adopting sealant sealing

Low cost, about 3.1 yuan

Good reliability, complete sealing (2.5 bar dwell, maximum leakage only 5Pa @60 s) (10 samples all seal well)

The process has good convenience (the assembly time is about 10 minutes), is convenient to automate (the time can be further shortened)

The water vapor permeability is less than 0.001 g/24h, and the water vapor permeability is hardly changed.

It can be found that, in the above sealing mode, the water vapor permeability of the battery cell is greatly reduced after all the heat-sealed edges of the battery cell are sealed, and the mode of adopting the sealant is low in cost and good in sealing performance.

Example 2

This embodiment is substantially the same as embodiment 1, except that the pouch battery is a B-type pouch battery, and the positive tab and the negative tab are respectively protruded from opposite sides, and as shown in fig. 8, the positive tab 141 and the negative tab 142 are respectively located at opposite ends of the pouch battery body 131. The type B pouch cell has two top edges, a first top edge 111 and a second top edge 112. Accordingly, the sealing frame includes a first frame top edge and a second frame top edge, and one or two frame side edges, either of which extends from a side of the first frame top edge to a same side of the second frame top edge.

As shown in fig. 11, another pouch battery module includes 3B-type pouch batteries 1B and a sealing frame 2B, and a body 13 of the pouch battery 1B is immersed in a cooling liquid to exchange heat with the cooling liquid; the sealing frame 2B comprises two top edges and side edges positioned at two sides of the top edges, and the top edges of the frame and the two

top edges

111 and 112 of the soft package battery 1B form sealing interfaces to seal the cooling liquid to avoid the cooling liquid from overflowing; the side edge of the sealing frame and the side edge 12B of the soft package battery 1B form a sealing interface, and the cooling liquid is sealed and isolated so as to avoid the overflow of the cooling liquid or avoid the direct contact of the cooling water and the battery trimming edge. And fins are further arranged between the soft package batteries and used for separating the soft package batteries and forming a cooling liquid flow passage between the soft package batteries.

Example 3

This embodiment is substantially the same as embodiment 1, except that the pouch cell of the pouch cell module in this embodiment has the following structure: the battery core of the soft package battery is wrapped by an aluminum-plastic film, the aluminum-plastic film comprises an aluminum layer (8021 aluminum alloy), the soft package battery is provided with a heat-sealed top edge and a heat-sealed side edge, the heat-sealed side edge is provided with a cutting edge, and the cutting edge is provided with the aluminum layer; laminate polymer battery's aluminium-plastic film outside still parcel has the second aluminium lamination (or to call outside aluminium lamination), aluminium lamination in the cutting edge with electrical insulation carries out anti-creep electricity between the second aluminium lamination and handles. The second aluminum layer is in direct contact with a coolant.

Wherein the aluminum plastic film is a three-layer aluminum plastic film formed by compounding a polyamide resin layer, an 8021 aluminum alloy layer and a polypropylene resin layer.

In order to enable the electric insulation strength (or voltage resistance strength) between the aluminum layer and the second aluminum layer in the edge cutting of the aluminum-plastic film to be larger than 1800 volts, the edge cutting on the heat-sealing side of the soft package battery is sealed by the PI insulating film so as to avoid the electric communication or creepage between the 8021 aluminum layer and the second aluminum layer in the edge cutting, or the electric communication or creepage between the 8021 aluminum alloy and the second aluminum layer is avoided through the edge folding of the heat-sealing side.

The second aluminium lamination extends in the laminate polymer battery side outside, and the two-layer second aluminium lamination in the laminate polymer battery side outside bonds each other to form sealedly.

Wherein the second aluminium lamination inboard gum in advance of parcel laminate polymer battery to make good laminating of second aluminium lamination and plastic-aluminum membrane.

The polyamide resin layer may have a multilayer structure of PA and PET. The polypropylene resin layer may have other multilayer structure having a heat-sealing function.

The above description of embodiments is merely exemplary in nature and is in no way intended to limit the scope, application, or uses of the invention.

Claims

1. The power battery module comprises a battery pack, a heat exchange medium and a module shell; the battery pack comprises a plurality of single batteries and power connecting sheets, and the power connecting sheets are electrically connected with the adjacent single batteries; the shell is wrapped outside the battery pack and the sampling module, the sampling module comprises a flexible circuit board and a protection device, and the flexible circuit board is electrically connected with a plurality of temperature sensors and current sensors; the temperature sensor is connected with the power connecting sheet, and the current sensor is electrically connected with the power connecting sheet; the protection device comprises an outer insulating layer and an inner insulating layer, the outer insulating layer covers the outer surface of the flexible circuit board, and the inner insulating layer is clamped between the power connecting sheet and the single battery.

2. The power battery module is characterized by comprising the following structures: a housing; the lithium battery units are arranged in the shell side by side, and the top ends of the lithium battery units are provided with anodes and cathodes; the first conductive polar plate comprises a first positioning part and a first contact part, the first positioning part is provided with a plurality of first positioning grooves which are arranged at intervals, and the positive electrodes respectively penetrate through the first positioning grooves and are electrically connected with the first positioning grooves; and the second conductive polar plate comprises a second positioning part and a second contact part, the second positioning part is provided with a plurality of second positioning grooves which are arranged at intervals, and the negative electrode respectively penetrates through the second positioning grooves and is electrically connected with the second positioning grooves.

3. The battery module according to claim 1, wherein: the power connecting piece comprises a first connecting end, a second connecting end and a fixed end, the first connecting end and the second connecting end are respectively and electrically connected to the positive terminal and the negative terminal of two adjacent single batteries, and the temperature sensor and the current sensor are connected to the fixed end.

4. The cooling system of claim 2, wherein the at least one cooling fin is cooperatively aligned with the at least two of the plurality of battery cells to define a coolant flow path therebetween.

5. The cooling system of claim 1, wherein the cooling system is configured as a series cooling system.