CN116845414A

CN116845414A - energy storage device

Info

Publication number: CN116845414A
Application number: CN202111102589.2A
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Chen Daixiu
Current assignee: Chen Daixiu
Priority date: 2021-09-20
Filing date: 2021-09-20
Publication date: 2023-10-03

Abstract

The application discloses a battery energy storage device, which comprises a battery module. The battery cell is slice-shaped, and the surfaces of the two sides of the battery cell along the thickness direction are main radiating surfaces of the battery cell. The box body comprises a bottom plate and a plurality of cooling plates arranged on the bottom plate; an accommodating space for accommodating the battery cells is formed between two adjacent cooling plates. The battery cell is installed in the accommodation space, the main cooling surfaces on two sides of the battery cell are respectively attached to the two adjacent cooling plates. After the battery core of the battery energy storage device is arranged on the box body, the main radiating surfaces at two sides of the battery core are attached to the cooling plates, so that the radiating performance of the battery core is improved, the whole heat dissipation of the battery core is uniform, the temperature difference of different parts of the battery core is small, and the service life of the battery core and the battery energy storage device is prolonged.

Description

Energy storage device

Technical Field

The application belongs to the field of power batteries, and particularly relates to an energy storage device.

Background

Compared with the traditional dry battery and fuel battery, 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 currently used lithium battery monomers mainly comprise a shell, electrolyte solution and a battery core which are placed in the shell, and an anode and a cathode are arranged at the top end of the lithium battery monomers.

In addition, the current soft package battery module is not enough to soft package battery side seal, if directly arrange in water can lead to water to leak into from the side and lead to battery bulge inefficacy.

The flexible packaging material of the flexible packaging battery is usually an aluminum plastic film, if 2 layers of aluminum foils are contained in the aluminum plastic film before the battery core is packaged, the aluminum foils are isolated and insulated by plastic layers, but in the trimming process after the battery is packaged, the two layers of aluminum foils at the trimming position are easy to creep up 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 exposed at the same time and the distance is too short (the thickness of the second resin is less than 0.1 mm). If the side edges are soaked in water, water seepage is easily caused to the side edges.

With the exhaustion of petroleum energy and the improvement of environmental protection requirements, 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 serving as a core power energy source of the electric automobile is particularly remarkable.

The power battery of the new energy automobile requires a 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, 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 voltage of each single battery need to be monitored. Therefore, the sampling module in the battery module is also important.

At present, most of sampling modules in a battery module are in a traditional wire harness sampling mode, and a sampling wire harness is used for being independently connected with a single battery and transmitting sampling signals. The sampling method has the advantages that the circuit is complex, the sampling wire harness is required to be assembled manually, and the automatic production is not facilitated; and the assembly process is extremely easy to have the phenomena of wrong assembly, neglected assembly and the like. In addition, a wire harness fixing structure is required to be independently arranged, the wire harness fixing structure is complex, and electric leakage is easily caused by abrasion of wire skin.

Therefore, on the premise of realizing large capacity of the battery module, the connection and sampling structures of the battery module need to be simplified as much as possible so as to provide the battery module with simple assembly and good safety performance.

Disclosure of Invention

To achieve the above object, the first aspect of the present invention provides the following:

the embodiment of the disclosure provides a battery energy storage device, which improves the heat dissipation performance of a battery cell and prolongs the service life of the battery cell.

In order to solve the above problems, the present disclosure adopts the following technical solutions: a battery energy storage device comprising: the battery cells are flaky, and the surfaces of the two sides of the battery cells along the thickness direction are main radiating surfaces of the battery cells;

the box body comprises a bottom plate and a plurality of cooling plates arranged on the bottom plate; an accommodating space for accommodating the battery cell is formed between two adjacent cooling plates;

The battery cell is installed in the accommodation space, the main cooling surfaces on two sides of the battery cell are respectively attached to the two adjacent cooling plates.

Optionally, a plurality of electric cores are arranged between two adjacent cooling plates; each battery cell is sequentially arranged along the length direction of the cooling plate;

the battery cells are respectively provided with a positive electrode and a negative electrode along the two ends of the length direction of the cooling plate, and the positive electrodes and the negative electrodes of the adjacent two battery cells are opposite in position;

the positive electrodes and the negative electrodes of two adjacent cells are connected through a first connecting sheet.

The invention also provides a soft package battery, which comprises at least one electric core, wherein a first packaging layer (such as a metal plastic composite film, such as an aluminum plastic film or a steel plastic film) is wrapped outside the electric core, the first packaging layer comprises a first metal layer (such as an aluminum layer or a steel layer), the electric core is provided with a top edge and a side edge, the first packaging layer is provided with a cutting edge at the top edge and/or the side edge, and the first metal layer is exposed in the cutting edge.

In a preferred embodiment, the first packaging layer comprises an upper layer and a lower layer, and sealing edges are formed between the cut edges of the first packaging layer of the upper layer and the lower layer in a sealing way.

In a preferred embodiment, the first packaging layer is in a bag shape, at least one side of the first packaging layer is provided with openings, each opening is provided with two trimming edges, and sealing edges are formed between the two trimming edges at the opening.

Such as: the first packaging layer is provided with the openings at the top, the bottom and at least one side part of the battery cell, two trimming edges are arranged at each opening, and sealing edges are formed between the two trimming edges at the opening.

More preferably, the sealing edge may be any one or more of a sealing top edge, a sealing side edge. Such as a heat-sealed top edge and a heat-sealed side edge.

In a preferred embodiment, a second packaging layer is further wrapped outside the first packaging layer, and the second packaging layer comprises a second metal layer; alternatively, a second metal layer (preferably an aluminum layer or a steel layer) or a metal foil tape (preferably an aluminum foil tape) is further wrapped outside the first packaging layer.

Preferably, the second metal layer is electrically insulated from the first metal layer exposed in the trimming or is subjected to an electrical insulation treatment, so that the second metal layer is electrically insulated from the first metal layer.

Preferably, when the pouch battery wrapped with the second metal layer is immersed in the cooling liquid, the second metal layer is in direct contact with the cooling liquid. And the first packaging layer or the metal plastic composite film is not contacted with the cooling liquid.

The application also provides a battery, which is a metal hard shell battery, wherein an insulating layer is wrapped outside the metal hard shell of the battery, a second metal layer is wrapped outside the insulating layer, and the second metal layer is insulated from the metal hard shell. Preferably, the dielectric strength is greater than 2002V.

In the above description of the present application, the term "second" is a generic term; for example, the second metal layer is broadly defined as another metal packaging layer that is wrapped around the cell from the metal layer in the metal composite film. The second metal layer may have not only a waterproof effect but also an effect of avoiding electromagnetic radiation, soaking and sealing.

In the application, the second packaging layer or the second metal layer and the like are integrally formed into a secondary package. The edges of the secondary wrapper preferably do not belong to the cut edges described in the present application.

Wherein, preferably, the creepage distance between the second metal layer and the first metal layer in the trimming is more than 2mm, more preferably more than 4 mm.

The number of the battery cells in the plurality of battery cells is preferably one or two.

Preferably, the second metal layer is not in contact with the first metal layer, and:

no insulator space exists between the exposed position of the second metal layer and the exposed position of the first metal layer, and the linear distance L1 between the exposed position of the second metal layer and the exposed position of the first metal layer closest to the exposed position of the second metal layer is more than or equal to 2mm; or an insulator interval exists between the exposed position of the second metal layer and the exposed position of the first metal layer, at least 1 convex peak exists in the insulator, the sum L2 of the distance d1 between the exposed position of the second metal layer and the highest position of the nearest convex peak of the insulator, the distance d2 between the highest positions of adjacent convex peaks and the distance d2 between the exposed position of the first metal layer and the highest position of the nearest convex peak of the insulator is more than or equal to 2mm.

Preferably, L1 and L2 are each independently preferably 5mm or more, more preferably 10mm or more.

Preferably, L1 and L2 are each independently preferably 50mm or less, more preferably 40mm or less.

Preferably, the coating of the first packaging layer and the coating of the second packaging layer are performed independently. Alternatively, the first and second packaging layers are separated prior to the wrapping operation, rather than having been combined into a unitary composite packaging film.

Wherein, preferably, the wrapping process of wrapping the battery cell with the metal plastic composite film and the wrapping process of further wrapping with the second metal layer are performed separately. Alternatively, the metal plastic composite film and the second metal layer are separated prior to the process of wrapping the cells, rather than having been combined into a unitary composite packaging film.

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

and wrapping the battery cell by a first packaging layer (such as a metal plastic composite film, such as an aluminum plastic film or a steel plastic film), wherein the first packaging layer forms a laminated edge at least one position of the side part, the top part or the bottom part of the battery cell, the laminated edge is cut to form trimming edges, and sealing is carried out between the laminated trimming edges, wherein the first packaging layer comprises a first metal layer (such as an aluminum layer or a steel layer), and the first metal layer is exposed from the first packaging layer at the trimming edges.

Preferably, the two first packaging layers cover the battery cells from two sides of the battery cells, and the stacked first packaging layers are cut at the top edge, the bottom edge and the side edges of the battery cells to form the cut edges.

Preferably, a first packaging layer wraps the cells, a stack is formed at the top, bottom and one side of the cells, and the stack is cut at the top, bottom and side of the cells to form the cut edges.

Preferably, the first packaging layer is in a bag shape, one side or two sides of the first packaging layer are open, the battery cell is arranged in the bag-shaped first packaging layer, the first packaging layer is stacked at the two openings, and the stacked first packaging layer is cut to form the trimming.

Preferably, the heat seal is performed between the stacked cut edges of the top and side edges of the cell to form a heat seal top edge and a heat seal side edge having a cut edge in which the first metal layer is exposed from the first packaging layer.

Preferably, the exposed first metal layer is capped by further electrically insulating (e.g., wrapping an insulating tape) outside the cut edges of the heat-seal top edges and/or heat-seal side edges.

Preferably, the first packaging layer (such as a metal plastic composite film) is externally wrapped with a second metal layer (such as an aluminum layer or a steel layer) or wrapped with a metal foil tape (such as an aluminum foil tape, a copper foil tape or a stainless steel foil tape) to form the soft package battery.

The above steps are preferably performed sequentially, and other process steps can be provided between each step.

The first packaging layer and the second packaging layer are both packaging materials of the soft package battery, and are all part of the soft package battery.

Further, the electrical insulation strength (or voltage resistance strength) 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 of the invention is X volts, which means that the voltage of X volts is applied between the second metal layer and the first metal layer in the trimming, and no short circuit, creepage or breakdown occurs.

Preferably, the second packaging layer covers the cut edge, or the second packaging layer does not cover the cut edge and the second packaging layer edge is at a distance from the cut edge of not less than 2mm, preferably not less than 5mm, more preferably not less than 10mm. .

Wherein, the first metal layer is preferably aluminum foil or 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 in this order, that is, the metal plastic composite film is formed by laminating the above 3 layers. 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 can be compounded by an adhesive, or is compounded by hot melting, or is compounded by other modes.

The cut edges on the heat-sealed sides of the pouch cells are preferably sealed by an insulating film to avoid electrical communication or creepage of the first metal layer with the second metal layer in the cut edges, or the cut edges are preferably hemmed to avoid electrical communication or creepage with the second metal layer.

Further, the second metal layer wraps the insulation film outside the trimming edge. The second metal layer is electrically insulated from the first metal layer in the trim.

Preferably, the second metal layer is wrapped outside the trimming and insulating film, and extends outside the side edges of the soft package battery, and the two second metal layers outside the side edges of the soft package battery are connected (preferably bonded) to form a seal.

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

Preferably, the inner side of the second metal layer is back-glued, so that the second metal layer is well attached to the metal plastic composite film.

The first resin layer and the second resin layer are each a single resin layer or a plurality of resin layers. 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-seal layer, such as a PP layer.

In the soft package battery, the trimming edge of the metal plastic composite film is subjected to insulation treatment to prevent the first metal layer from being exposed. The insulation treatment mode is preferably sealing and wrapping by adopting an insulation film; alternatively, the insulating treatment is preferably performed by heat-sealing the side edges of the pouch cell to prevent the first metal layer from being exposed.

In the soft package battery described above, the second metal layer and the second resin layer are bonded by using an adhesive resin.

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, aluminum foil tape is used as a second metal layer to wrap the aluminum plastic film.

The soft package battery is characterized in that the two layers of the second metal layers which are positioned on the front side and the rear side of the soft package battery and extend out of the side edges of the soft package battery are mutually attached and sealed.

The invention also provides a soft package battery cooling device as follows: a soft package battery cooling device comprises a soft package battery and cooling liquid, wherein the soft package battery is wrapped by a soft package material, and the soft package material wrapping the soft package battery is in direct contact heat exchange with the cooling liquid. The flexible packaging material comprises (or is laminated with) a first resin layer, a first metal layer and a second resin layer, and further comprises a second metal layer, wherein the second metal layer wraps the outer side of the second resin layer. The second metal layer is in direct contact with the cooling liquid.

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

The flexible packaging material disclosed by the invention has the deformation-prone performance relative to a hard shell outside a square hard shell battery. The flexible packaging material 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 or 200 microns or less. 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 multiple compounding. The multiple composite forming can be that the primary soft package battery is formed by wrapping the battery core by the aluminum plastic film, and then the soft package battery is formed by wrapping the primary soft package battery by the second metal layer.

The battery cell 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-seal top edge and a heat-seal side edge, the heat-seal side edge is provided with an edge cutting, and the edge cutting is provided with the first metal layer; and a second metal layer is further wrapped outside the metal plastic composite film, the cut 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 the cooling liquid.

A cooling device for a soft-packaged battery comprises cooling liquid and any soft-packaged battery, wherein a second metal layer outside the soft-packaged battery is in direct contact heat exchange with the cooling liquid.

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 in the heat-sealed top edge or the heat-sealed side edge). The trimming comprises a resin layer (such as a PP layer) and a first metal layer. The trimming is the cross section of the heat-sealed edge after heat sealing of two layers of metal plastic composite films (such as traditional aluminum plastic films).

For clarity and convenience, the invention is described 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 the soft package battery is provided with a body and the heat sealing edge, and the periphery or three weeks of the body of the soft package battery are provided with the heat sealing edges.

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 leakage current between a cooling night and the anode and the cathode of the battery cell 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 ohm/volt), and solve the insulation problem in the long-term (such as more than 10 years) running process of the vehicle.

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

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

A battery module including a plurality of the soft pack cells and a coolant, the battery module being constructed in the following structure and function: at least part of the outermost layer of the packaging material on the soft package battery core body is in direct contact with the cooling liquid for heat exchange, and the trimming edge on the sealing edge of the soft package battery core is not in contact with the cooling liquid.

A sealing structure for cooling liquid in the soft package cell module is provided, which enables at least part of the outermost layer of packaging material on the soft package cell body to be in direct contact heat exchange with the cooling liquid, and the trimming edge on the sealing edge of the soft package cell is not in contact with the cooling liquid.

A battery cooling liquid sealing structure comprises a plurality of soft package electric cores and cooling liquid, wherein a sealing interface is arranged between at least part of a soft package electric core body and a trimming edge on a soft package electric core sealing edge, so that at least part of an outermost layer of packaging material on the soft package electric core body is in direct contact heat exchange with the cooling liquid, and the trimming edge on the soft package electric core sealing edge is not in contact with the cooling liquid.

The first metal layer in the trim on the cell seal is not in contact with and in electrical communication with the electrically conductive coolant.

The battery module comprises a plurality of soft-package batteries and cooling liquid, wherein the soft-package batteries are packaged by an aluminum plastic film, a second metal layer is further packaged outside the aluminum plastic film, and the battery module is structured in a sealing structure so that at least part of the second aluminum foil layer is in direct contact with the cooling liquid, and all trimming edges on the aluminum plastic film are not in contact with the cooling liquid.

A battery module comprises a plurality of batteries and cooling liquid, wherein the batteries are provided with a metal shell, an insulating layer is wrapped outside the metal shell, a second metal layer is further wrapped outside the insulating layer, and the battery module is constructed in a sealing structure so that at least part of the second metal layer is in direct contact with the cooling liquid, and the insulating layer is not in contact with the cooling liquid.

Wherein the cooling fluid in the above series of schemes contains at least 5% water by mass.

The sealing frame comprises side frames positioned on two sides of the battery trimming edge, and a sealing surface is formed between the side frames and the battery sealing edge.

Preferably, the sealing frame comprises a structure of the type ii or type ≡, the sealing frame comprises one or two frame top edges, more preferably one or two frame side edges. Wherein the type ii or type ≡is basic or approximate in shape.

A battery (preferably a pouch battery) system with a sealed frame that forms a sealing surface with the sealed edges of the battery to isolate the cut edges on the sealed edges of the battery from the coolant.

Preferably, the sealing frame comprises side frames positioned on two sides of the battery trimming, and a sealing surface is formed between the side frames and the battery sealing edges.

Preferably, the sealing frame comprises one or two frame top edges and one or two frame side edges, and the frame top edges, the frame side edges and the sealing edges of the battery form a sealing surface.

Preferably, the sealing surface may be at a position between the trimming and the cell, or preferably, the sealing surface may be at a position where the cell is located. Preferably, at least two batteries are arranged in each sealing frame, and sealing is carried out between the two batteries to form a sealing surface. The sealing surface can be located between the trimming edge and the battery cell, or preferably, the sealing surface can also be located at the position of the battery cell, or can also be the edge position of the side of the battery away from the trimming edge.

Preferably, the second metal layer of the cell is located near one end of the trim, in the region between the sealing surface and the trim.

Preferably, the side of the sealing surface remote from the cut edge is the area that contacts the coolant when the battery is in use.

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 from penetrating into the battery core through the edge cutting of the sealing edge. Further, the sealing frame can also play a role in supporting and fixing the soft package battery.

Wherein, frame topside and soft packet of battery topside seal laminating for sealed soft packet of battery topside. The frame side is sealed and attached to the side of the soft package battery, and is used for sealing the side of the soft package battery.

The invention provides a soft package battery sub-module (or sub-module), which comprises a laminated body formed by laminating two (or more) soft package batteries together, and an anti-corrosion layer wrapped outside the laminated body. The anti-corrosion layer can prevent the cooling liquid from corroding, penetrating and contacting the soft-packaged battery.

Preferably, the soft pack battery submodule further comprises an elastic material (preferably elastic foam) sandwiched between the two soft pack batteries, and the elastic material can buffer volume change of the batteries when the batteries expand.

The anti-corrosion layer may be directly wrapped around the outside of the laminate or may be indirectly wrapped around the outside of the laminate (the term "indirectly wrapped" means that another layer is wrapped between the anti-corrosion layer and the laminate).

The corrosion-preventing layer preferably comprises a metal layer.

As an example, the anticorrosive layer is preferably an aluminum foil layer or an aluminum plastic composite film.

The anti-corrosion layer is spaced from the insulator-free space at the exposed part of the trimming first metal layer of the sealing edge of the soft package battery, and the linear distance L1 between the anti-corrosion layer and the exposed part of the nearest first metal layer is more than or equal to 2mm.

Or an insulator interval exists between the anticorrosive coating and the exposed part of the first metal layer, at least 1 convex peak exists on the insulator, and the sum L2 of the distance d1 between the anticorrosive coating and the highest position of the nearest convex peak of the insulator, the distance d2 between the highest position of the adjacent convex peak and the exposed part of the first metal layer and the distance d2 between the nearest convex peak of the insulator is more than or equal to 2mm.

The invention is characterized in that the anti-corrosion layer for blocking water penetration and corrosion is arranged after the finished battery cell and then is wrapped, and the problems of insufficient insulation strength and insufficient electric clearance between the anti-corrosion layer and the aluminum plastic film trimming are creatively solved.

The present invention also provides a sealed frame for a battery, the frame having one or two frame top edges and having one or two frame side edges, the frame top edges being connected to the frame side edges; the top edge of the frame can be in sealing fit with the top edge of the soft package battery core, the side edge of the frame can be in sealing fit with the side edge of the soft package battery core or can be in sealing fit with the side edge of another frame, and a through hole for cooling liquid to circulate is further formed in the side edge of the frame.

The invention also provides a battery module, which comprises a plurality of sealed frames, a plurality of battery units (the battery units are preferably soft package batteries or soft package battery sub-modules) and cooling liquid, wherein the frames are provided with one or two frame top edges and one or two frame side edges, and the frame top edges are connected with the frame side edges; the top edge of the sealing frame is in sealing fit with the top edge of the battery unit, the side edge of the frame is in sealing fit with the side edge of the battery unit or in sealing fit with the side edge of another frame, at least one part of the battery unit body is in direct contact with cooling liquid, and if trimming edges are arranged on all sealing edges (including the top edge and the side edge) of the battery, the trimming edges are not in contact with the cooling liquid. Wherein the cooling fluid preferably comprises at least 5% water.

As described above, further, the frame side is further provided with a through hole for the circulation of a cooling liquid.

The battery module as described above, further, the battery unit is preferably any of the above secondary-wrapped batteries.

The battery module is characterized in that the cooling liquid heat-conducting plate is integrated in the cavity formed by the frame, and the periphery of the heat-conducting plate is connected with the frame into a whole. The flow guide plate can not only organize the flow field of the cooling liquid, but also strengthen the rigidity of the sealing frame.

When the battery unit is a hard-shell battery, the edge sealing of the battery unit is formed by mutually attaching secondary wrapping materials. The secondary packaging material wraps the body of the battery and extends out of the battery body, and the two layers of secondary packaging materials are mutually attached to form the battery edge sealing. The crust cells form a battery cell with no edge cut.

When the secondary packaging material is arranged outside the soft package battery or the soft package battery sub-module, the sealed joint of the sealing frame and the battery unit sealing edge preferably means that the sealing frame is sealed joint with the secondary packaging material outside the battery unit sealing edge.

The invention provides a soft package battery module, which comprises a soft package battery sub-module and a separator which are stacked in sequence, wherein a fluid channel for cooling liquid to flow is formed between the soft package battery sub-module and the separator.

As one of preferable embodiments, at least three of the peripheral edges of the separator and the corrosion-preventing layer outside the pouch battery on both sides of the separator are provided with a sealing structure or a sealing structure in which the coolant flows.

Preferably, the sealing surface between the frame and the first packaging layer or the second packaging layer is sealed by a sealant.

Preferably, the sealing surface between the frame and the first packaging layer or the second packaging layer is sealed by an elastomer which is pressed against the sealing surface between the frame and the first packaging layer.

Preferably, the trimming edge surrounds the edge of the battery, the frame surrounds the battery cell in a ring shape, and through holes are formed in the frame for cooling liquid to pass through.

The invention provides another 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 (called edge sealing for short); the sealing edges of the soft package battery are clamped between the frame edges of two adjacent sealing frames, and the sealing edges of the frame edges and the soft package battery form a sealing interface. When the soft package battery is charged and discharged or the module is assembled on the whole vehicle, the module also contains cooling liquid; the soft-packed battery body is in direct contact with the cooling liquid for heat exchange (or the wrapping material wrapping the outermost layer of the soft-packed battery body is in direct contact with the cooling liquid for heat exchange, or the outermost layer of the wrapping material wrapping the soft-packed battery body is in direct contact with the cooling liquid for heat exchange). The frame edge and the sealing edge of the soft package battery form a sealing interface, so that the cooling liquid directly contacting and exchanging heat with the soft package battery body can be sealed to avoid the cooling liquid from overflowing or flowing through the sealing edge; thereby avoiding contact between the cooling liquid and the edge cutting on the battery sealing edge and also avoiding contact between the cooling liquid and the positive and negative electrodes of the battery.

In the present invention, two adjacent sealing frames are optionally adjacent to each other with other parts included therebetween.

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

In the present invention, the sealing frame refers to a structure in which a frame side (a frame top side and/or a frame side) and a battery sealing side form a sealing interface; the two adjacent sealing frames can be closely adjacent to each other or can contain other parts in between.

The sealed edge of the pouch cell may be a sealed top edge, or a sealed side edge, or a sealed bottom edge (if any). The sealing edge sealing mode can be heat sealing or adhesive sealing. These sealing edges have open cut edges with sealant (which may be a heat seal resin or an adhesive) that, if exposed to the coolant (i.e., the cut edges are in direct contact with the coolant), tend to cause the coolant to slowly penetrate from the sealant in the cut edges, so that a sealing interface is formed between the frame edges and the pouch cell sealing edges, so that all the cut edges are physically isolated from the coolant. Power pouch cells typically have 4 sides, which are divided into sealed sides and folded sides. There are no cut edges on the folds and cut edges on the seal edges. The soft package battery can be provided with 4 sealing edges, 3 sealing edges and 1 flanging.

Preferably, the sealing interface of the present invention can withstand coolant hydraulic pressures of 2bar or more (more preferably 5bar or more) relative to pressure so that coolant contacting the cell body does not leak through the sealing interface from one side of the cell body to the other side of 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; the sealed frame comprises a frame top edge and frame side edges positioned on one side or two sides of the frame top edge, the frame top edge and the top edge of the soft package battery form a sealed interface, and the capacity of the battery is more than 10 ampere hours.

Further, the frame sides form a sealing interface with the sides of the pouch cells.

When the soft package battery is charged and discharged or the module is assembled on the whole vehicle, the module also contains cooling liquid; the soft-packed battery body is in direct contact with the cooling liquid for heat exchange (or the wrapping material wrapping the outermost layer of the soft-packed battery body is in direct contact with the cooling liquid for heat exchange, or the outermost layer of the wrapping material wrapping the soft-packed battery body is in direct contact with the cooling liquid for heat exchange).

The invention also provides another battery module, which comprises a plurality of batteries and a plurality of sealing frames; the sealing frame comprises a frame top edge and frame side edges positioned on one side or two sides of the frame top edge, and a sealing interface is formed between the frame top edge of the sealing frame and the battery.

Further, a sealing interface is formed between the frame side 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 the whole vehicle, the module also contains cooling liquid; the soft-packed battery body is in direct contact with the cooling liquid for heat exchange (or the wrapping material wrapping the outermost layer of the soft-packed battery body is in direct contact with the cooling liquid for heat exchange, or the outermost layer of the wrapping material wrapping the soft-packed battery body is in direct contact with the cooling liquid for heat exchange).

The invention also provides a battery module, which comprises a plurality of batteries which are stacked and arranged and a cooling liquid channel between the batteries, wherein an insulating layer is wrapped outside the batteries, an anti-corrosion layer is wrapped outside the insulating layer, and a sealing structure is arranged at least three peripheries of the anti-corrosion layer between the adjacent batteries, so that the cooling liquid between the adjacent batteries can be led to circulate without leaking outside the sealing structure.

The anticorrosive 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 of the cells, or by arranging sealing rubber strips on the periphery of the cells.

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 configured that at least part of the soft package battery cells are contacted with the cooling liquid, and the edge cutting of the heat sealing edge of the soft package battery cells is not contacted with the cooling liquid.

The 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, the aluminum plastic films of the soft package battery cells comprise a first metal layer, the aluminum plastic films of the soft package battery cells are also wrapped with protective layers, the cooling liquid can conduct electricity, and the battery module is structured into a structure with the following functions: at least part of the protective layer used for wrapping the soft package battery core 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 core and the conductive cooling liquid is greater than 2002 volts.

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

Further, the protective layer comprises a second metal layer, and the electric insulation strength between the first metal layer and the second metal layer lasts for more than 5 years and more than 2002 volts.

Further, no insulator is arranged between the exposed position of the second metal layer and the exposed position of the first metal layer, and the linear distance L1 between the exposed position of the second metal layer and the exposed position of the first metal layer closest to the exposed position of the second metal layer is more than or equal to 2mm; or an insulator interval exists between the exposed position of the second metal layer and the exposed position of the first metal layer, at least 1 convex peak exists in the insulator, the sum L2 of the distance d1 between the exposed position of the second metal layer and the highest position of the nearest convex peak of the insulator, the distance d2 between the highest positions of adjacent convex peaks and the distance d2 between the exposed position of the first metal layer and the highest position of the nearest convex peak of the insulator is more than or equal to 2mm.

The invention also provides a battery module, which comprises a plurality of soft package electric cores and cooling liquid, wherein the soft package electric cores are packaged by aluminum plastic films, the aluminum plastic films of the soft package electric cores comprise a first metal layer, the aluminum plastic films of the soft package electric cores are also wrapped with protective layers, the cooling liquid can conduct electricity, and the battery module is structured as a structure with the following functions: at least part of the protective layer used for wrapping the soft package battery core 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 core and the conductive cooling liquid is more than 2002 volts;

the battery module is also configured to have the following sealing structure: the sealing interface is arranged between at least part of the soft package battery cell body and the edge cutting on the soft package battery cell sealing edge, so that at least part of the protective layer on the soft package battery cell body is in direct contact heat exchange with the cooling liquid, and the edge cutting on the soft package battery cell sealing edge is not in contact with the cooling liquid.

The soft package battery module comprises a plurality of soft package battery cells and cooling liquid, wherein the soft package battery cells are packaged by an aluminum plastic film, the aluminum plastic film comprises a first aluminum foil layer, a second plastic insulating layer is further wrapped outside the aluminum plastic film of the soft package battery cells, and a second aluminum foil protective layer is further wrapped outside the second plastic insulating layer; the soft pack battery module is constructed in a structure having the following functions: at least part of the second aluminum foil protective layer is in direct contact heat exchange with the 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 more than 2000 volts; or/and, the electric gap between the first aluminum foil layer and the second aluminum foil protective layer is greater than 2.2 mm.

Wherein, before the soft package battery cell 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; the module also comprises cooling liquid; the edge cutting on the sealed side edge of the soft package battery is sealed between the frame side edges of the two adjacent sealed frames, so that the edge cutting on the sealed side edge is isolated from the cooling liquid; the body of the soft package battery is in direct contact with the cooling liquid for heat exchange. This avoids direct contact between the cutting edges and the coolant.

The invention also provides another battery (preferably soft package battery) module, which comprises a plurality of batteries or battery packs and a plurality of sealing frames; the sealing frame includes a frame top edge that forms a sealing interface with the top edge of the cell or stack, and a frame side edge that is located on one or both sides of the frame top edge. This prevents coolant from contacting the tab through the top edge and trimming the top edge. Wherein, the battery is preferably a battery with a capacity of more than 10 ampere hours. The battery is preferably a nickel-containing lithium battery. The frame sides may form a sealing interface with adjacent frame sides, or with other components.

In a further preferred embodiment of the battery module as described above, the frame side forms a sealing interface with the side of the battery or the battery pack.

Wherein, the battery pack comprises two or more batteries, and waterproof films or waterproof foils (the waterproof foils are preferably aluminum foils) are wrapped outside the two or more batteries. The battery pack is preferably also provided with a fireproof layer and/or a foam layer.

The battery pack is preferably a pouch battery pack.

For example, two soft package batteries are sandwiched with a foam layer to form an intermediate body, and an aluminum foil layer is wrapped outside the intermediate body to serve as an anti-corrosion layer. When the cooling liquid passes through the soft package battery module, the anti-corrosion layer is contacted with the cooling liquid, and the plastic layer on the soft package battery is not contacted with the cooling liquid.

The top edge of the soft package battery pack is formed by pressing the top edges of the two or more soft package batteries together and wrapping the waterproof film or the waterproof foil, and the side edge of the soft package battery pack is formed by pressing the side edges of the two or more soft package batteries together and wrapping the waterproof film or the waterproof foil.

The invention also provides another square metal hard shell battery module, which comprises a plurality of metal hard shell batteries stacked, wherein an insulating layer is wrapped outside the metal hard shell batteries, a waterproof layer (preferably an aluminum foil layer) is wrapped outside the insulating layer, and a cooling liquid channel is further arranged in the module and is arranged between two adjacent metal hard shell batteries. Preferably the dielectric strength between the metal hard shell and the waterproof layer is greater than 1000V, further greater than 2002V.

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

Preferably, the metal-crust battery is a blade battery.

The soft package 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 at both sides of the frame top edge. Still further, the sealing frame also has a frame bottom edge located on a side of the frame side opposite the frame top edge.

Alternatively or in addition, the sealing frame has two frame sides and one frame side, the frame sides being located on the same side as the frame sides.

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

Or further, the sealing frame has two frame top edges connected to each other and one or two frame side edges located on the side 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 the pouch cell has a heat-sealed bottom edge, the sealing frame further has a frame bottom edge, and the heat-sealed bottom edge of the pouch cell is disposed between the frame bottom edges of two adjacent sealing frames, and the frame bottom edge and the bottom edge of the pouch cell form a sealing interface.

The sealing frame forms a sealing interface with the heat-sealed edges of the pouch cells, the pouch cells having heat-sealed top edges and heat-sealed side edges, and correspondingly, the sealing frame having a corresponding configuration and number of frame top edges and frame side edges. Of course, the seal frame may also have a frame bottom edge as desired.

Further, the soft package battery module further comprises a partition board, the module comprises a plurality of soft package batteries, a plurality of sealing frames and a plurality of partition boards, wherein the soft package batteries, the sealing frames and the partition boards are stacked, the partition boards are used for separating the soft package batteries on two sides of the partition boards and forming a flow channel, and cooling liquid flows in the formed flow channel and is in direct contact heat exchange with the soft package battery body.

Preferably, the sealing frame comprises an n-shaped or ≡shaped structure, and the sealing frame comprises one or two frame top edges and two or one frame side edge. The type II (abbreviated as "several" type) or the type ≡ (abbreviated as "mouth" type) is general shape (or basic type II or type ≡type). Wherein, the frame topside is laminated with soft packet of battery topside for sealed soft packet of battery topside. The frame side is attached to the side of the soft package battery and is used for sealing the side of the soft package battery.

The top edge of the frame forms a sealing interface with the heat-sealing top edge of the soft package battery, so that the cooling liquid in direct contact with the soft package battery body can be sealed to avoid the cooling liquid from overflowing outwards from the heat-sealing top edge.

The frame sides form a sealing interface with the heat-sealed sides of the pouch cells, which may allow the cooling fluid to seal against coolant escaping outwardly from the heat-sealed sides, and/or may allow the cooling fluid to seal against coolant coming into contact with the cut edges of the pouch cells. Wherein, the "avoiding the contact of the cooling liquid with the edge cutting of the soft package battery" refers to "avoiding the direct contact of the cooling liquid with the edge cutting of the soft package battery" or "avoiding the contact of the cooling liquid with the edge cutting of the soft package battery after penetrating other substances". The "edge cutting of the soft package battery" refers to the edge cutting of the hot edge sealing or sealing edge of the soft package battery. The cut edges typically comprise a non-metallic resin or adhesive layer in cross section.

Where "sealing the cooling fluid" is also understood as "making the cooling fluid unable to flow through the sealing interface" or "making the cooling fluid not penetrate the sealing interface to the other side". The soft package battery body refers to a part, which is bulged on the soft package battery and is wrapped with positive and negative electrode cores, of an electric core wrapped in the soft package battery body can generate heat during working and needs to be cooled. At least part of the soft package battery is soaked in the cooling liquid and exchanges heat with the cooling liquid.

The direct contact between the soft package battery and the cooling liquid refers to the direct contact between the outer package material wrapping the soft package battery and the cooling liquid. The outer packaging material for wrapping the soft package battery comprises a packaging material for directly wrapping the battery cell and also comprises a packaging material for secondary wrapping (or indirect wrapping). When the soft pack battery has a secondary (or indirect) packing material, the "direct contact of the soft pack battery body with the cooling liquid" means that the packing material for the secondary (or indirect) packing on the soft pack battery body is in direct contact with the cooling liquid. By a secondary wrapped (or indirectly wrapped) material is meant a packaging material in which the material is wrapped around the exterior of a pouch cell that already has an outer packaging material (primary wrapper). The soft package battery with the secondary package is in direct contact with the cooling liquid, which means that the secondary package material is in direct contact with the cooling liquid. The term "secondary package" is a generic term and includes a plurality of packages such as a package of two or more times. The soft package battery is preferably wrapped by an aluminum-plastic composite film.

Definition of top edge of pouch cell: the soft package battery is provided with a sealing edge with a tab extending out. The pouch cell has one top edge or two top edges.

According to the arrangement form of the positive and negative 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 refers to that the positive and negative lugs are led out from the same heat-sealing edge. The B-type soft package battery refers to that the positive and negative lugs are led out from the heat-sealed edges at the two opposite sides. The heat-sealed edge with the electrode lugs extending out is defined as a top edge, so that the A-type battery cell has only 1 top edge; the 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-sealing edge (A-type soft package battery), namely, the positive and negative lugs of the soft package battery extend outwards from the top heat-sealing edge; the pouch cell may also have 2 top heat sealed edges (B-pouch cell), i.e., the positive and negative tabs extend outwardly from opposite heat sealed edges, respectively.

For a type a pouch cell, the side opposite the top side is the bottom side, which may be either a heat sealed side or a hem (the hem does not require heat sealing, nor is there a cut edge).

For a type B pouch cell, if the type B pouch cell has only 1 heat sealed side edge, the bottom edge refers to the edge that is not heat sealed and trimmed. If the B cell has 2 heat sealed sides, the B cell has no bottom side.

The soft package battery can be provided with 3 heat-sealed edges (or sealing edges) and 1 folded edge, and the folded edge does not need heat sealing but is folded in half; there may be no hem, i.e. the 4 sides are all heat sealed edges or sealed edges.

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

The soft package battery module further comprises a frame, wherein the inner side of the side edge of the frame forms a sealing interface with the heat sealing side edge of the soft package battery.

The soft package battery module further forms a sealing interface between the outer sides of the two adjacent frame sides. The sealing interface can enable the cut edge of the soft package battery to be sealed in the frame, so that the cut edge is prevented from being in direct contact with outside air or cooling liquid.

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

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

b) The sealing frame comprises a sealing frame skeleton and an elastic sealing member, and the sealing frame skeleton of two adjacent sealing frames clamps the elastic sealing member and the heat-sealing side edges of the soft package battery, so that the trimming edges of the heat-sealing side edges are sealed in the frame side edges. In this way, the trim is completely contained within the elastomeric seal. This allows the cooling liquid on both sides of the elastic seal not to come into direct contact with the trim.

c) The sealing frame comprises a sealing frame skeleton and an elastic sealing piece, and the sealing frame skeleton of two adjacent sealing frames clamps the elastic sealing piece and the heat-sealing side edge of the soft package battery, so that the trimming edge of the heat-sealing side edge is sealed outside the frame side edge, and the cooling liquid in direct contact with the soft package battery body is physically isolated from the trimming edge. Thus, the trimming edge and the cooling liquid are respectively positioned at two sides of the side edge of the frame.

d) The sealing frame comprises a frame top edge and frame side edges positioned on two sides of the frame top edge.

e) The frame also comprises a frame bottom edge, wherein two sides of the frame bottom edge are connected with the frame side edges of the two sides or the frame top edges of the two sides.

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

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

h) The seal frame includes a first frame top edge and a second frame top edge, and one or two frame sides, either of which extends from the first frame top edge side to the second frame top edge.

i) Among the two adjacent sealing frames, one sealing frame is provided with a concave sealing surface, and the other sealing frame opposite to the concave sealing surface is provided with a convex sealing surface which is matched for sealing.

As described above, the soft pack battery module may be configured such that the side or bottom of the sealing frame is provided with a cavity, or a cavity is formed between the side or bottom of two adjacent sealing frames, the cavity being used for inflow or outflow of the cooling liquid. More precisely, the side edges or the bottom edges of the sealing frames positioned at the two adjacent sides of the partition plate are provided with cavities, or the cavities are formed between the side edges or the bottom edges of the sealing frames positioned at the two adjacent sides of the partition plate, and the cavities are used for inflow or outflow of cooling liquid.

In another type of the soft-pack battery module, the sealing frame does not have a bottom edge (for example, the sealing frame has a structure of a n-type), and the cooling liquid flows in or out from the separator between the bottoms of the adjacent soft-pack batteries.

The soft pack battery module as described above, further comprising a cooling liquid container in which the soft pack battery and the sealing frame are disposed.

The soft pack battery module according to the above, further, the module further comprises a bottom plate, the bottom plate forms a seal with the bottom of the sealing frame (such as the open side of the pi-shaped sealing frame), and the bottom of the soft pack battery module or the bottom plate has an inlet and an outlet for the cooling liquid.

The soft package battery module is characterized in that the rest parts (including the trimming edge of the soft package battery, the resin layer or the adhesive layer in the middle of the soft package material and the sealing glue layer or the resin layer for bonding the wrapping material of the outermost layer) of the soft package battery are not contacted with the cooling liquid except the wrapping material of the outermost layer is contacted with the cooling liquid. The outermost wrapping material may be the outermost wrapping material.

Binding the sealing frames by using a binding belt outside the soft package battery module, or fastening the sealing frames by using a through bolt; so that the sealing between two adjacent sealing frames clamping the heat sealing edge of the soft package battery is good.

The top edge of the sealing frame refers to the edge of the sealing frame which is attached to the top edge of the soft-packaged battery, and the side edge of the sealing frame refers to the edge of the sealing frame which is attached to the side edge of the soft-packaged 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 the individual seal frames is preferably 1.6 g to 9992 g.

Further, the thickness of the individual seal frames is preferably 0.4 mm to 93 mm.

Further, the battery is a soft-pack battery or a hard-shell battery, and the soft-pack battery is preferably a lithium ion soft-pack battery.

Further, the material of the sealing frame is preferably a sealing frame containing plastic.

In the above scheme, the battery is provided with a positive electrode metal foil and a negative electrode metal foil, and the thickness of the positive electrode metal foil is preferably 3.2-48 micrometers. The thickness of the negative electrode metal foil in the battery is preferably 3.3-47 micrometers

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

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

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

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

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

and sealing glue is coated between the sealing edge of the soft-package battery and the sealing edge of the sealing frame, so that a sealing surface is formed between the sealing edge of the sealing frame and the sealing edge of the soft-package battery.

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;

and the sealing frame and the soft package battery are sequentially stacked, so that sealing edges of the sealing frame and sealing edges of the soft package battery form a seal.

In the above method, the sealing is preferably formed by coating a sealant or providing a gasket on the sealing edge of the sealing frame and the sealing edge of the soft-pack battery. The sealing is performed to seal the coolant so that the coolant flowing on the surface of the pouch cell body does not contact the cut edges.

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

The cooling fluid according to the invention may be a variety of liquid media, preferably water, or an antifreeze cooling fluid (or antifreeze) comprising ethylene glycol and at least 11% by mass of water, or a lubricating oil. All percentages are by mass unless otherwise specified in the present invention.

In the invention, 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 pack battery module of the present invention may also be referred to as a soft pack battery module. The scope of the present invention includes various possible combinations of the above-described aspects or technical features. The present invention is not described in detail herein.

In the present invention, when a subsequent scheme refers to the aforementioned scheme, a sub-scheme referring to the aforementioned scheme is included where applicable. Scheme 1 is referenced as scheme 2, including reference to scheme 1 and its possible sub-schemes.

In the present invention, the technical features expressed as "further" or "still further" or "preferably" etc. may be used as the sub-solutions or as additional technical features of the dependent claims.

In the invention, under the condition that the meanings are not contradictory, the further additional technical characteristics are applicable to all subordinate technical schemes; the subordinate solutions may either comprise only one further additional feature or may comprise a plurality of further additional features.

In the invention, the trimming non-contact cooling liquid refers to at least those trimming non-contact cooling liquid which forms the edge sealing of the battery cell of the sealing surface with the sealing frame; preferably, all the cut edges do not contact the coolant. The trimming is not contacted with the cooling liquid, so that the heat seal plastic layer in the aluminum plastic film is not contacted with the cooling liquid.

The top edge and the side edge of the sealing frame can be integrally formed, assembled and formed, and can be formed by combining a plurality of pieces to have corresponding functions; but is preferably integrally formed. The frame side edges can form a sealing surface with the battery cell sealing edge or form a sealing surface between the two frame side edges.

The battery and the cell have the same meaning in the present invention, unless the meaning is not contradictory and is not specifically indicated or distinguished.

The invention also provides the following soft package battery module scheme: the soft pack battery module according to any one of the above soft pack battery module schemes, wherein the soft pack battery is any one of the above soft pack battery schemes. Specifically, the following schemes are included, by way of example only:

a soft package battery module comprises a plurality of soft package batteries and a plurality of sealing frames which are stacked; the sealed 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 sealed frames, and the frame top edges and the top edges of the soft package batteries form a sealed interface; the sides of the pouch cells are disposed between the frame sides of the two sealing frames, and the frame sides and the sides of the pouch cells form a sealing interface. When the soft package battery is charged and discharged or the module is assembled on the whole vehicle, the module also contains cooling liquid; the soft-packed battery body is in direct contact heat exchange with the cooling liquid (or the packing material of the outermost layer of the soft-packed battery body is in direct contact heat exchange with the cooling liquid); the battery cell of the soft package battery is externally wrapped with a metal plastic composite film (an aluminum plastic film or a steel plastic film), wherein 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-sealing top edge and a heat-sealing side edge, the heat-sealing side edge is provided with a trimming edge, and the trimming edge is provided with the first metal layer; and a second metal layer (an aluminum layer or a steel layer) or a metal foil tape (such as an aluminum foil tape, a copper foil tape or a stainless steel foil tape) is wrapped outside the metal plastic composite film of the soft package battery, and the second metal layer is electrically insulated or subjected to electrical insulation treatment with the first metal layer in the trimming, so that the second metal layer is electrically insulated from the first metal layer. The second metal layer is in direct contact with the cooling liquid when the soft pack battery body is immersed in the cooling liquid or when the soft pack battery body exchanges heat with the cooling liquid. And the sealing frame and the second metal layer form a sealing interface, so that the metal plastic composite film is not contacted with the cooling liquid.

The soft package battery module comprises a plurality of soft package battery cells and cooling liquid, wherein the soft package battery cells 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, at least a second protective layer is wrapped on the outer side of the aluminum plastic film, and the second protective layer comprises a second aluminum foil protective layer; the soft pack battery module is constructed in a structure having the following functions:

at least part of the second aluminum foil protective layer is in direct contact with the 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 more than 2002 volts; or/and, an electrical gap between the first aluminum foil layer and the second aluminum foil protective layer is greater than 2.2 millimeters; and, in addition, the processing unit,

the battery module is also provided with a sealing structure, wherein a sealing interface is arranged between at least part of the soft package battery cell body and the edge cutting on the sealing edge of the soft package battery cell, so that at least part of the outermost layer of the packaging material on the soft package battery cell body is in direct contact with the cooling liquid, and the edge cutting on the sealing edge of the soft package battery cell is not in contact with the cooling liquid.

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 sealed and wrapped by an insulating material, so that an electric gap between the first aluminum foil layer and the second aluminum foil protective layer is infinite.

Above, the second protective layer is surveyed and is provided with the adhesive layer, so that the second protective layer with soft packet of electric core bonding and attaching are good. The adhesive is preferably a pressure sensitive adhesive.

Further, a second plastic insulating layer is further arranged between the aluminum plastic film and the second aluminum foil protective layer, and the second plastic insulating layer wraps the soft package battery core for the second time after the aluminum plastic film wraps the pole core to form the soft package battery core.

Further, the soft package battery module further comprises a plurality of sealing supports, each sealing support comprises a sealing top edge and a sealing side edge, a sealing surface is formed between the sealing top edge and the top sealing edge of the soft package battery core on two sides, and a sealing surface is formed between the sealing side edges and the side sealing edges of the soft package battery core on two sides, so that cooling liquid is in contact with the outermost packaging material on the body of the soft package battery core and is not in contact with the trimming edges on the sealing edges of the soft package battery core.

The second protective layer of the invention preferably wraps the soft-packaged battery core for the second time after the aluminum plastic film wraps the pole core to form the soft-packaged battery core. The secondary package of the invention means that the package layer and the previous package layer are packaged separately, but not together.

The function is as follows: the second aluminum foil protective layer can play roles of moisture blocking, heat conduction, soaking and electromagnetic shielding, and can also reduce the problem of cost increase caused by multi-layer compounding and disperse the expansion force of the battery core. The secondary wrapping mode of the second aluminum foil protective layer is also beneficial to solving the problem of insufficient electric gap and insulation strength.

The invention also provides a manufacturing method scheme of the battery module: the method comprises the following steps:

providing a plurality of soft package battery cores which are packaged by an aluminum plastic film, wherein the aluminum plastic film comprises a first aluminum foil layer;

providing a second protective layer, wherein the second protective layer comprises a second aluminum foil layer, the second protective layer is wrapped outside the soft package battery core, and the electric gap between the second aluminum foil layer and the first aluminum foil layer in the aluminum plastic film is more than 2 mm; and

and a sealing structure is arranged in the battery module, so that at least part of the outermost packaging material on the soft package battery core body is in contact with the cooling liquid, and the edge cutting on the sealing edge of the soft package battery core is not in contact with the cooling liquid.

The invention also provides a rectangular aluminum hard shell battery module scheme, which comprises a plurality of rectangular aluminum hard shell batteries and conductive cooling liquid, wherein a plastic insulating layer is wrapped outside the rectangular aluminum hard shell, an aluminum foil protective layer is wrapped outside the plastic insulating layer, and an electric gap between the rectangular aluminum hard shell and the aluminum foil protective layer is larger than 2 mm; and, in addition, the processing unit,

the battery module also comprises a sealing structure for sealing the cooling liquid, and a 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 but not in contact with the plastic insulating layer. The sealing surface is preferably arranged along said edge on said aluminium foil protective layer. The sealing surface is preferably provided by means of a coating of a sealant.

Further, the rectangular aluminum hard shell battery has a length of 600mm to 2500mm and a ratio of length/thickness of between 23 and 208.

The top edge and the side edge of the sealing frame are integrally formed, assembled and formed, and have corresponding functions by combining a plurality of pieces; but is preferably integrally formed. The frame side edges can form a sealing surface with the battery cell sealing edge or form a sealing surface between the two frame side edges.

The battery and the cell have the same meaning in the present invention.

The battery module comprises a plurality of single batteries, wherein the single batteries have a first size, and the first size is the maximum value of the distance between two parallel planes for virtually clamping the single batteries; at least one single cell satisfies: the first size of 600mm or less is 2500mm or less, and comprises a shell and a pole core positioned in the shell.

The invention also provides an energy storage device which comprises any one of the battery modules.

Further, the capacity of the soft package battery module in the energy storage device is in the range of 1.7 kilowatt-hours to 970 kilowatt-hours. Further, the energy storage device further comprises at least 2 temperature sensors.

Drawings

Fig. 1 is a schematic view of an a-type pouch cell (also known as a pouch cell) having a body 13 and 1 top heat seal 11 and 2 side heat seal 12, with the heat seal 12 having a cut edge 120.

The schematic view of a cross section (i.e., cut edge) 120 of the outermost edge of the heat sealed edge of the flexible battery in fig. 2 is sequentially laminated with 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 easy to allow moisture to permeate through and enter the inside of the battery cell.

Fig. 3 ≡structural seal frame includes 1 frame top edge 21 and 2 frame side edges 22 and 1 frame bottom edge 23.

The sealing frame of figure 4 ii-shaped structure comprises 1 frame top edge 21 and 2 frame side edges 22.

The pouch cell 1 of fig. 7 is assembled in the sealed frame 2 with the tab 14 extending from the top edge of the frame, wherein the edge cut of the pouch cell heat seal is disposed in the middle of the sealed frame side 22, and both the inside and outside of the sealed frame side are immersed in the cooling water, but the edge cut of the pouch cell is physically isolated from the cooling water.

Fig. 8A is a B-type flexible battery, which includes a first tab 141 and a second tab 142, the first tab 141 and the second tab 142 are respectively located at two opposite sides of the flexible battery body 131, and fig. 8B is a schematic structural diagram of a sealing frame for the flexible battery.

Fig. 9 is another pouch battery module including a pouch battery 1B and a sealing frame 2B.

FIG. 10 is a schematic diagram of a soft pack battery sub-module according to the present invention; wherein, the left graph of fig. 10 is two soft package batteries 1B and is sandwiched with a piece of elastic foam 15, and the left graph does not show the anti-corrosion layer; fig. 10 is a right side view showing a cross section of the soft pack battery sub-module in the thickness direction, which has two soft pack batteries 1B, a piece of elastic foam 15, and an anti-corrosion layer 16 wrapped around the outside of the soft pack batteries 1B.

Fig. 11 and 12 are schematic diagrams of several measurement modes of the distance between the first metal layer and the second metal layer.

Detailed Description

Example 1

In the embodiment, the soft package battery is in direct contact heat exchange with the cooling liquid; the battery top is equipped with utmost point ear 14, and this soft packet of battery contains at least one electricity, and the electric core is wrapped up by soft packaging material, soft packaging material contains first resin layer (polypropylene resin layer), first metal layer (aluminum alloy layer) and second resin layer (nylon layer and/or PET layer).

For example, as shown in fig. 1, the cell 1 may be a flat rectangular structure including a body 13, the body 13 having a sealed top edge 11 and sealed side edges 12 at the periphery, the flexible packaging material having a cut edge 120 at the top edge and/or side edges, and the first metal layer being exposed at the cut edge 120.

The flexible packaging material comprises two layers which are coated on the upper and lower sides of the battery cell, the cut edges of the two layers of flexible packaging material are sealed, sealing side edges 12 are formed on the side parts, and a sealing top edge 11 is formed on the top part. Tabs 14 extend from the top edge of the seal.

As shown in fig. 2, the sealing edge and the trimming part of the conventional soft pack battery are laminated in the upper and lower directions, and a protective layer (a first resin layer, such as nylon) 123, an aluminum layer 121, a heat sealing layer 122, an aluminum layer 121, and a protective layer 123 are sequentially formed from top to bottom, and the second resin layer is heat-sealed together after being heated. The application suggests that a nylon layer and/or a PET layer is used as a second resin layer, the second resin layers of the laminated soft packaging material can be connected together to form a sealing layer after being heated and melted, or sealant is added between the second resin layers to be used as the sealing layer, and the laminated soft packaging material is sealed and connected at a notch.

The trimming of the flexible packaging material is subjected to insulation treatment so as to wrap the exposed first metal layer. The insulation treatment mode adopts an insulation film for sealing and wrapping; or the soft package battery is thermally sealed and folded to prevent the exposed first metal layer from being wrapped.

Also, in the present embodiment, a second metal layer (e.g., an aluminum alloy layer) may be further wrapped outside the second resin layer, but the second metal layer is not necessary in the present embodiment. The second metal layer and the second resin layer are bonded by adopting adhesive resin, and the adhesive resin is coated on the second metal layer in advance or coated on the second plastic layer in advance. When the second metal layer is present, referring to fig. 11 (case 1), the edge of the second metal layer 124 is not flush with the trimmed edge, two sharp corners are formed between the top end of the second metal layer 124 and the first metal layer 121 by the first resin layer, the distance between the top end of the second metal layer 124 and the first sharp corner is d1, the distance between the first sharp corner and the second included angle is d3, the distance between the second sharp corner and the first metal layer (which can also be regarded as the thickness of the first resin layer at the trimmed position) is d2, d1+d2+d3 is not less than 2mm. Alternatively, as shown in fig. 12 (case 2), there is only one sharp angle between the top of the second metal layer 124 and the first metal layer 121, and the distance between the top of the second metal layer 124 and the sharp angle is d1+the distance from the sharp angle to the first metal layer (which can also be regarded as the thickness of the first resin layer at the edge cutting point) d2+.gtoreq.2 mm. Or the first packaging layer on the lower layer is turned up at the edge cutting position of the first packaging layer on the upper layer, the edge cutting of the first packaging layer is coated, the edge cutting of the first packaging layer on the lower layer faces the second metal layer 124, and the distance between the edge cutting position of the first metal layer 121 in the first packaging layer on the lower layer and the second metal layer 124 is more than or equal to 2mm.

The soft package battery module is packaged by an aluminum plastic film, and comprises 14 soft package batteries 1 (A-type soft package batteries) and a sealing frame 2, wherein the sealing frame is used for fixing the soft package batteries and then is arranged on a fixing frame 3 for position fixing, and a body 13 of the soft package batteries 1 is soaked in cooling liquid to be in direct contact with the cooling liquid for heat exchange; referring to fig. 3, 4 and 7, the sealing frame 2 includes a top edge 21 and side edges 22 on both sides of the top edge, and the top edge 21 of the frame forms a sealing interface with the sealing top edge 11 of the battery 1 to seal the cooling liquid to avoid the overflow of the cooling liquid; the inner sides of the side edges 22 of the sealing frame 2 form a sealing interface with the sealing side edges 12 of the battery 1, and the outer sides of the adjacent two frame side edges form a sealing interface, so that the cooling liquid is sealed and isolated to avoid contact between the cooling liquid and the cut edges of the soft package battery. The cooling liquid is an antifreeze liquid containing ethylene glycol and at least 11% of water. 8 fins 4 are arranged between the soft package batteries and outside the module, and are used for separating the soft package batteries and forming cooling liquid flow channels between the soft package batteries. Every two fins 2 are provided with 2 soft package batteries, so that at least one surface of each soft package battery is ensured to be in direct contact with the cooling liquid for heat exchange.

The edge (cross section) of the heat sealing edge of the soft package battery comprises a high Polymer Polypropylene (PP) layer 122, and the long-term water-gas barrier property of the PP layer 122 is not very good, if the PP layer is placed in cooling water to be in direct contact with the cooling water, water in the cooling water can be slightly permeated into the battery core through the PP layer to react with electrolyte to generate hydrofluoric acid, so that the direct contact between the cooling water and the edge of the battery is required to be avoided, and the service life of the battery is prolonged.

In this embodiment, a sealant is further disposed between two adjacent sealing frames, and seals the cut edges of the soft package battery therein. Alternatively, the sealing frame is formed by integrating a sealing frame skeleton (such as a plastic piece or a metal piece) and an elastic sealing piece (such as a rubber piece), and the sealing frame skeleton of two adjacent sealing frames clamps the elastic sealing piece and the heat sealing edges on the side surfaces of the soft package battery so as to enable the edge cutting sealing of the soft package battery and the elastic sealing piece to be in contact.

For example, the sealing frame 2 includes two parts, the soft package battery is clamped between the two parts, wherein the side edges of the two parts clamp the side heat sealing edges of the soft package battery, the side edges of the soft package battery are close to the side of the soft package battery body, the sealing glue coats one side of the side edges of the two parts and the side heat sealing edges of the soft package battery, and the sealing glue bonds and seals the side heat sealing edges of the soft package battery to form a sealing surface. Or, the side edge of the soft package battery is provided with an elastomer near one side of the soft package battery body, the elastomer can be arranged on one or two side edges of the soft package battery body, or can be arranged on the aluminum plastic film, or the first resin layer of the aluminum plastic film has elasticity or is replaced by the elastomer. The elastic body is clamped between the side edges of the two parts and the side heat sealing edges, and the elastic body forms a sealing surface through elastic force.

Fig. 3 shows the sealing frame as a ≡type structure, including a frame top edge 21, a bottom edge 23, and left and right side edges 22. If the pouch cell comprises a bottom heat seal, i.e., a heat seal bottom edge, the cut edge of the heat seal bottom edge of the pouch cell is sealed between the bottom edges 23 of the adjacent two seal frames.

Referring to fig. 3 and 4, the side of the sealing frame is provided with a cavity 221, or a cavity 221 is formed between the sides of adjacent sealing frames, and the cavity is used for flowing in or out of the cooling liquid, so that the cooling liquid flows through the cavity on one side, contacts with the soft-pack battery body for heat exchange, and then flows out through the cavity on the other side.

The module further comprises a cooling fluid container in which the sub-assembly of the pouch cells and the sealing frame is placed, the container having an inlet and an outlet for cooling water (not shown).

In this embodiment, the sealing surface adopts a sealing mode B: the EPDM rubber sealing strips are attached to the positions, close to the body 13, of all the heat sealing edges of the battery cell, of the side edges, the top edges and the bottom edges of the sealing frame are sealed through the EPDM rubber sealing strips and the heat sealing edges to form sealing surfaces, one side without the heat sealing edges is not provided with the sealing frame, so that cooling liquid enters the area limited by the sealing frame through one side without the heat sealing edges, and the trimming edges of the sealing edges are isolated outside the cooling liquid by the sealing surfaces.

Moderate cost, about 8 yuan

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

The process has moderate convenience (about 22 minutes of assembly time)

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

In this embodiment, the sealing surface adopts a sealing mode C: the sealing glue is coated at the positions, close to the body 13, of all the heat sealing edges of the battery cell, the side edges, the top edge and the bottom edge of the sealing frame are sealed between the sealing glue and the heat sealing edges to form sealing surfaces, one side without the heat sealing edges is not required to be arranged on the sealing frame, so that cooling liquid enters into the area limited by the sealing frame through one side without the heat sealing edges, and the trimming edges of the sealing edges are isolated outside the cooling liquid by the sealing surfaces.

Low cost, about 3.1 yuan

Good reliability, complete sealing (2.5 bar pressure maintaining, maximum leakage of only 5 Pa@60s) (10 samples are all well sealed)

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

The water vapor permeability is less than 0.001 g/24h, and almost no water vapor can permeate.

Comparative example 1, without using the sealing frame in example 1, seal a was used: the pouch cells are sealed only at the top edge, in which case the side edges are exposed to water.

The cost is higher, about 12 yuan

Poor reliability, easy micro leakage at corners (2.5 bar pressure maintaining, leakage amount reaching 120 Pa@60s), and high leakage probability (10 samples have leakage with different degrees)

Poor process convenience (assembly time of about 1 hour)

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

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

Example 2

The present embodiment is similar to embodiment 1, except that the pouch cell is a B-type pouch cell, and the positive and negative tabs are respectively formed on opposite sides, as shown in fig. 8A, and the positive tab 141 and the negative tab 142 are respectively located on opposite ends of the pouch cell body 131. The B-type pouch cell has two top edges, a first top edge 111 and a second top edge 112. Accordingly, the seal frame includes a first frame top edge and a second frame top edge, and one or two frame sides, either of which extends from one side of the first frame top edge to the same side of the second frame top edge. Fig. 8B shows a sealed frame of the type ii configuration for a type B pouch cell comprising 1 frame top edge 22 and 2 frame side edges 21, the two side edges 21 being disposed at a first top edge 111 and a second top edge 112, sealed by way of example 1, top edge 22 being disposed at pouch cell side edge 12B, sealed by way of example 1, the first top edge 111, second top edge 112, pouch cell side edge 12B being isolated by a sealing surface in the area enclosed by sealing frame 2, and cooling fluid entering through an opening under sealing frame 2, cooling fluid contacting body 13, but not contacting the cooling fluid at the cut edges.

As shown in fig. 9, another soft pack battery module comprises 3B-type soft pack batteries 1B and a sealing frame 2B, wherein a body 13 of the soft pack 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, the top edges of the frame and the two top edges 111 and 112 of the soft-packed battery 1B form a sealing interface, and the cooling liquid is sealed to avoid overflow; the side edges of the sealing frame and the side edges 12B of the soft package battery 1B form a sealing interface, and the cooling liquid is sealed and isolated to avoid the overflow of the cooling liquid or the direct contact of the cooling water and the cut edges of the battery. Fins are further arranged between the soft package batteries and used for separating the soft package batteries and forming cooling liquid flow channels between the soft package batteries.

Example 3

The present embodiment is substantially the same as embodiment 1, except that the pouch battery of the pouch battery module of the present embodiment has the following structure: the battery cell 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-sealing top edge and a heat-sealing side edge, the heat-sealing side edge is provided with a trimming edge, and the trimming edge is provided with the aluminum layer; and a second aluminum layer (or an outer aluminum layer) is also wrapped outside the aluminum-plastic film of the soft package battery, and the aluminum layer in the trimming is electrically insulated from the second aluminum layer and is subjected to creepage prevention treatment. The second aluminum layer is in direct contact with the cooling liquid.

The aluminum plastic film is of a three-layer structure 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-resistant strength) between the aluminum layer in the edge cutting of the aluminum plastic film and the second aluminum layer to be larger than 1800 volts, the edge cutting on the heat sealing side edge of the soft package battery is sealed by the PI insulating film so as to prevent the 8021 aluminum layer in the edge cutting from being electrically communicated with or creepage with the second aluminum layer, or the edge folding is performed through the heat sealing side edge so as to prevent the 8021 aluminum alloy from being electrically communicated with or creepage with the second aluminum layer.

The second aluminum layer extends outside the side edge of the soft package battery, and two layers of second aluminum layers outside the side edge of the soft package battery are mutually bonded to form a seal.

The inner side of the second aluminum layer of the soft package battery is coated with adhesive in advance, so that the second aluminum layer is well attached to the aluminum plastic film.

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

Example 4

FIG. 10 is a schematic view of another flexible battery sub-module of the present invention; wherein, the left graph of fig. 10 is two soft package batteries 1B and is sandwiched with a piece of elastic foam 15, and the left graph does not show the anti-corrosion layer; fig. 10 is a right side view showing a cross section of the soft pack battery sub-module in the thickness direction, which has two soft pack batteries 1B, a piece of elastic foam 15, and an anti-corrosion layer 16 wrapped around the outside of the soft pack batteries 1B.

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

Claims

1. A battery energy storage device, comprising:

the battery cells are flaky, and the surfaces of the two sides of the battery cells along the thickness direction are main radiating surfaces of the battery cells;

2. The battery energy storage device of claim 1, wherein a plurality of electrical cells are disposed between two adjacent cooling plates; each battery cell is sequentially arranged along the length direction of the cooling plate;

3. The battery energy storage device of claim 2, wherein a plurality of middle isolation members are provided on the cooling plate at intervals in a length direction;

Adjacent two cells are separated by the middle isolation component; the first connecting piece penetrates through the middle isolation component.