CN116845415A - energy storage device - Google Patents

energy storage device Download PDF

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Publication number
CN116845415A
CN116845415A CN202111111782.2A CN202111111782A CN116845415A CN 116845415 A CN116845415 A CN 116845415A CN 202111111782 A CN202111111782 A CN 202111111782A CN 116845415 A CN116845415 A CN 116845415A
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CN
China
Prior art keywords
battery
sealing
edge
frame
soft package
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111111782.2A
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Chinese (zh)
Inventor
请求不公布姓名
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chen Daixiu
Original Assignee
Chen Daixiu
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chen Daixiu filed Critical Chen Daixiu
Priority to CN202111111782.2A priority Critical patent/CN116845415A/en
Publication of CN116845415A publication Critical patent/CN116845415A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/211—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6554—Rods or plates
    • H01M10/6555—Rods or plates arranged between the cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/514—Methods for interconnecting adjacent batteries or cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Battery Mounting, Suspending (AREA)
  • Secondary Cells (AREA)

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 present application is in the field of mobile devices having energy storage devices.
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. 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, electric vehicles or hybrid vehicles have become a necessary development trend to replace the existing fuel vehicles. Therefore, the importance of the battery module serving as a core power energy source of the electric automobile is particularly remarkable.
Disclosure of Invention
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.
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.
Optionally, a plurality of middle isolation components are arranged on the cooling plate at intervals along the length direction;
adjacent two cells are separated by the middle isolation component; the first connecting piece penetrates through the middle isolation component.
Optionally, the middle isolation component comprises a fixing piece and an insulating piece;
the fixing piece is fixedly connected with the cooling plate; the insulating piece is provided with a connecting groove, and the insulating piece is sleeved on the fixing piece through the connecting groove; the first connecting piece penetrates through the insulating piece.
The insulator comprises a first block and a second block; a notch groove is formed in the first block; the first connecting piece penetrates through the notch groove; the second block cover is arranged on the first block to close the top opening of the notch groove.
Optionally, both side surfaces of the battery core along the length direction of the cooling plate are arc convex surfaces;
the two sides of the middle isolation part are respectively provided with a first arc concave surface;
the arc convex surface of the battery cell is attached to the first arc concave surface.
Optionally, at the end part of the cooling plate, two electric cores at two sides of the cooling plate are connected through a second connecting sheet; the second connecting piece extends from one side of the cooling plate to the other side of the cooling plate.
Optionally, the battery energy storage device comprises an end isolation member; the end isolation member has a slit portion; the end isolation part is clamped at the end part of the cooling plate through the cutting joint part;
the second connecting piece is disposed through the end isolation member.
The above is the first part of the present invention.
Second part
The second part of the invention also provides the following soft pack battery related and battery cooling device solutions:
the invention provides a soft package battery submodule, which comprises a plurality of battery cells, wherein metal plastic composite films (such as aluminum plastic films or steel plastic films) are wrapped outside the battery cells, the metal plastic composite films comprise first metal layers (aluminum layers or steel layers), the battery cells are provided with heat-seal top edges and heat-seal side edges, the heat-seal top edges and the heat-seal side edges are provided with trimming edges, and the trimming edges are provided with the first metal layers;
A second packaging layer is further wrapped outside the metal plastic composite film of the plurality of electric cores, and the second packaging layer comprises a second metal layer; or, a second metal layer (preferably an aluminum layer or a steel layer) or a metal foil tape (preferably an aluminum foil tape) is wrapped outside the metal plastic composite film of the plurality of electric cores;
the second metal layer is electrically insulated or subjected to an 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; wherein the thickness of the first metal layer is greater than 20 micrometers, and the first metal layer preferably contains at least 0.1 mass% of elemental iron.
The pouch cell submodule is a special pouch cell and is also suitable for reference to the following scheme as one of the pouch cells.
Under the condition that the meanings are not contradictory and are not specified, the soft package battery in the invention can refer to a soft package battery which is only wrapped by an aluminum plastic film in the prior art, and can also comprise a soft package battery or a battery pack which is packaged for multiple times.
The invention 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 2001V.
When the soft package battery wrapped with the second metal layer is soaked in the cooling liquid, the second metal layer is in direct contact with the cooling liquid. The metal plastic composite film is not contacted with the cooling liquid.
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 has waterproof effect, and also has effects of preventing electromagnetic radiation, soaking and sealing. In the invention, 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 invention.
Wherein, preferably, the creepage distance between the second metal layer and the first metal layer in the trimming is more than 2 mm, more preferably more than 4 mm.
The number of the battery cells in the plurality of battery cells is preferably one or two.
As one of the preferable schemes, the insulator interval is not arranged between the exposed position of the second metal layer and the exposed position of the first metal layer, and the linear distance 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 2.1mm; 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, and the sum 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 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 2.1mm.
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 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).
The invention also provides a manufacturing method for manufacturing the soft package battery, which comprises the following steps:
wrapping the battery core of the soft-packaged battery by using a metal plastic composite film (an aluminum plastic film or a steel plastic film) and forming a top edge and a side edge, wherein the metal plastic composite film comprises a first metal layer (an aluminum layer or a steel layer);
heat-sealing the top edge and the side edge to form a heat-sealed top edge and a heat-sealed side edge, wherein the heat-sealed side edge is provided with a trimming edge, and a first metal layer is arranged in the trimming edge;
Carrying out electric insulation treatment (such as wrapping an insulating tape) outside the trimming of the heat-sealed side edges so as to avoid exposure of the first metal layer in the trimming;
and wrapping 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) outside the metal plastic composite film to form the soft package battery.
The above steps are preferably performed sequentially, and other process steps can be provided between each step.
The metal plastic composite film and the second metal layer are both used as packaging materials of the soft package battery, and all belong to a part of the soft package battery in the second part of the invention.
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.
Further, the electrical gap between the first metal layer and the second metal layer in the cut edge is greater than 2 mm, preferably greater than 5 mm, and more preferably greater than 10 mm.
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 soft package battery cooling device comprises a soft package battery and cooling liquid, wherein the outer part of the soft package battery is wrapped by a metal plastic composite film, the metal plastic composite film comprises a first metal layer, the soft package battery is provided with a heat-sealing top edge and a heat-sealing side edge, the heat-sealing side edge is provided with a trimming edge, and the trimming edge is provided with the first metal layer; and a second metal layer is further wrapped outside the metal plastic composite film, the edge cutting and the second metal layer are electrically insulated or subjected to electrical insulation treatment, the second metal layer is in direct contact with the cooling liquid, and the negative electrode material of the battery contains graphite.
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 coolant in the present invention is preferably an antifreeze coolant (or antifreeze) containing ethylene glycol and at least 11% water.
The trimming of the metal plastic composite film refers to the trimming of the sealing edge of the soft package battery (namely the trimming in the heat-seal top edge or the heat-seal side edge). The trimming comprises a resin layer (such as a PP layer) and a first metal layer. The edge cutting is the cross section of the edge sealing after the 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 sealed edges of the soft-packaged battery are divided into a top sealed edge (abbreviated as a top edge) and a side sealed edge (abbreviated as a side edge), and sometimes the soft-packaged battery is provided with a body and the sealed edges, and the periphery or three weeks of the body of the soft-packaged battery are provided with the sealed 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 41 to 199 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.
Third part
The following third part provides the following soft package battery sealing frame scheme and soft package battery module technical scheme:
a sealed frame for a pouch cell, said sealed frame comprising a pi-shaped or ≡shaped structure, said sealed frame comprising one or two frame top edges and one or two frame side edges. Wherein the type ii or type ≡is basic or approximate in shape.
Wherein the sealing frame of the II type is provided with 3 frame sides which are vertically connected in sequence, the seal frame has 4 frame sides vertically connected in order.
The sealing frame is characterized in that the top edge and the side edge of the frame form sealing surfaces with the sealing edges of the soft package battery, so that the cut edges of the sealing edges of the soft package battery are isolated from cooling liquid.
The sealing frame mainly plays a role in sealing the sealing edge of the soft-package battery, and prevents cooling liquid from leaking outside through the sealing edge or 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 laminating are used for sealed soft packet of battery topside, and frame side and soft packet of battery side laminating are used for sealed soft packet of battery side.
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 electrical clearance between the corrosion protection layer and the edge cut of the sealed edge of the soft package battery is more than 2 mm, more preferably more than 5 mm. 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 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, and the coolant flows in a region defined by the sealing structure.
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 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); at least one frame edge forms a sealing interface with at least one sealing edge of the pouch cell. 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 of the coolant with the cut edges on the corresponding seal of the battery.
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 means a structure in which at least one frame side thereof forms a sealing interface with at least one sealing side of the battery.
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. The pouch battery generally has 3 or 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 a coolant pressure of 1bar or more relative to the pressure so that the coolant contacting the battery body does not leak from one side of the battery body to the other side of the sealing interface through the sealing interface.
The invention also provides a soft package battery module, which comprises a plurality of soft package batteries and a plurality of sealing frames which are stacked; the sealed frame comprises a frame top edge and frame side edges positioned on one side or two sides of the frame top edge, the top edge of the soft package battery is arranged between the frame top edges of two adjacent sealed frames, 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. In one embodiment, further, the sides of the pouch cells are disposed between the frame sides of adjacent two of the sealing frames, the frame sides forming 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).
In the present invention, two adjacent sealing frames are optionally adjacent to each other with other parts included therebetween.
The invention also provides another battery module, which comprises a plurality of batteries and a plurality of sealing frames which are stacked; the sealing frame comprises a frame top edge and frame side edges positioned on one side or two sides of the frame top edge, a sealing interface is formed between the frame top edge of the sealing frame and the battery, and a sealing interface is formed between the frame side edges 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, and can enable cooling liquid to circulate in the cooling liquid channel between the adjacent batteries 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 such that at least part of the soft package battery cells are contacted with the cooling liquid, and edge cutting edges of edge sealing of the soft package battery cells are not contacted with the cooling liquid.
The invention also provides a series of schemes A, which comprise five schemes A1 to A5:
a1: a battery module comprises a plurality of soft package battery cells and cooling liquid,
it is configured (with 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 all the trimming edges on the sealing edge of the soft package battery core are not in contact with the cooling liquid.
A2: a sealing arrangement for a coolant in a soft pack cell module, wherein the sealing arrangement provides for at least a portion of the outermost layer of packaging material on the soft pack cell body to be in direct contact with the coolant for heat exchange, and wherein the cut edges on the top side of the soft pack cell do not contact the coolant.
A3: a battery cooling liquid sealing structure comprises a plurality of soft package battery cells and cooling liquid, wherein a sealing interface is arranged between at least part of a soft package battery cell body and a trimming edge on the sealing edge of the soft package battery cell body, so that at least part of the outermost layer of packaging material on the soft package battery cell body is in direct contact heat exchange with the cooling liquid, and the trimming edge on the sealing edge of the soft package battery cell is not in contact with the cooling liquid.
A4: 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.
A5: 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 liquid in the series of schemes A1-A5 contains at least 5% of water by mass.
Any one of the battery modules or the sealing structures (including schemes A1-A5) further comprises a sealing frame, the sealing frame comprises a II-shaped or ≡type structure, the sealing frame comprises one or two frame top edges, the battery comprises a top edge, the top edge of the battery and the frame top edges of the adjacent sealing frames are stacked, and the frame top edges and the top edges of the battery form sealing interfaces. Wherein, the battery can be selected as a single electric core; alternatively, a battery pack including two or more cells may be used. Wherein the sealing frame is preferably made of plastic material.
Any of the battery modules or sealing structures described above, further, the sealing frame further comprises one or two frame sides, the battery further comprises sides, the sides of the battery and the frame sides of the adjacent sealing frames are stacked, and the frame sides and the sides of the battery form a sealing interface.
The invention also provides a series of schemes B, which comprise B1-B5:
scheme B1: 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 2001 volts.
The protective layer is used for isolating the aluminum plastic film and the cooling liquid of the soft package battery core.
The invention also provides any one of the battery modules according to the schemes A1-A5, and the battery module also has all the technical characteristics of the scheme B1.
Scheme B2: further to the solution B1, the protective layer includes a second metal layer, and the electrical insulation strength between the first metal layer and the second metal layer lasts for more than 5 years and more than 2001 volts.
Scheme B3: further based on the aspect B1, an electrical gap between the first metal layer and the second metal layer is greater than 2 millimeters.
Scheme B4: based on the scheme B1, the battery module further has the technical characteristics described in the schemes A1-5.
Namely, the scheme B4 includes: 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 2001 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 cell body and the edge cutting on the soft package cell sealing edge, so that at least part of the protective layer on the soft package cell body is in direct contact heat exchange with cooling liquid, and all the edge cutting on the soft package cell sealing edge is not in contact with the cooling liquid, and the cooling liquid contains at least 10% of water in mass fraction.
Unless otherwise specified, all percentages in the present invention refer to mass percentages.
Scheme B5: 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 greater than 2001 volts; or/and, an electrical gap between the first aluminum foil layer and the second aluminum foil protective layer is greater than 2 millimeters.
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 which are stacked; 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 soft package battery packs and a plurality of sealing frames which are stacked; the sealing frames comprise frame top edges and frame side edges positioned on one side or two sides of the frame top edges, the top edges of the soft package battery packs are arranged between the frame top edges of two adjacent sealing frames, and the frame top edges and the top edges of the soft package battery packs form sealing interfaces. 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.
As described above, further, the sides of the pouch battery module are disposed between the frame sides of the adjacent two sealing frames, and the frame sides and the sides of the pouch battery pack form a sealing interface.
In the invention, the soft package battery pack comprises one or two or more soft package batteries, and a waterproof film or a waterproof foil (preferably an aluminum foil) is wrapped outside the one or two or more soft package batteries (or outside the soft package battery pack). The soft package battery pack is preferably also provided with a fireproof layer or/and a foam layer.
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.
Wherein as one of the sub-schemes, the top edge of the soft package battery pack is formed by combining the top edges of the two or more soft package batteries together and wrapping a waterproof film or a waterproof foil, and the side edge of the soft package battery pack is formed by combining the side edges of the two or more soft package batteries together and wrapping a waterproof film or a 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 comprising 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 2001V.
Preferably, the creepage distance between the metal hard shell and the waterproof layer is more than 2mm, and further more than 4.2mm.
Preferably, the metal-crust battery is a blade battery.
The pouch battery module (including aspects A1, A4, and A5) as described above, further comprising a plurality of sealing frames having a frame top edge and two frame side edges, the frame side edges being located on 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 sealed frame forms a sealed interface with the pouch cell edge seal, the pouch cell has a heat seal top edge and a heat seal side edge, and correspondingly, the sealed frame has a corresponding structure 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.
The soft package battery module (comprising schemes A1, A4 and A5) further comprises a sealing frame, wherein the sealing frame comprises a II-shaped or ≡shaped structure, and the sealing frame comprises one or two frame top edges and two or one frame side edge. The shape of the II type (called "gate" type for short) or the ≡type (called "mouth" type for short) is approximate (or basic II type or ≡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. The "edge cutting of the soft package battery" refers to 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 pouch battery has a secondary wrapped (or indirectly wrapped) packaging material, the "direct contact of the pouch battery body with the cooling liquid" means that the packaging material for the secondary wrapping on the pouch battery body is in direct contact with the cooling liquid. The secondary-wrapped material means a wrapping material in which the material is wrapped on the outside of a soft-packed battery that already has an outer wrapping material (primary wrapping material). 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 edge. The B-type soft package battery refers to that the positive and negative lugs are led out from the edges of two opposite sides. The edge sealing edge from which the electrode lugs extend is defined as the 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 sealing edge (A-type soft package battery), namely, the positive and negative lugs of the soft package battery extend outwards from the top sealing edge; the pouch cell may also have 2 top sealed edges (B-pouch cell), i.e., the positive and negative tabs thereof extend outwardly from opposite sealed edges, respectively.
For a type a pouch cell, the side opposite the top side is the bottom side, which may be edge sealed or hemmed (hemming does not require heat sealing, nor is there any edge cut).
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 sealed or 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 trimming (also called as a section) refers to a cross section of the outermost edge of a heat-sealing edge of a metal plastic composite film (such as an aluminum plastic film), and the middle part of the cross section is usually a plastic heat-sealing layer. The soft package battery in the scheme of the invention can be selected as an A type soft package battery or a B type soft package battery.
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 sealing edge, namely a bottom sealing edge, and the edge cutting edge of the bottom sealing edge 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 for clamping the edge sealing 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 1.7 g to 9993 g.
Further, the thickness of the individual seal frames is preferably 0.4 mm to 94 mm.
Further, the battery is a soft-pack battery or a hard-shell battery, and the soft-pack battery is preferably a soft-pack lithium salt battery or a sodium salt 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 3.4-46 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. The soft pack battery of the claim or the scheme may also comprise a soft pack battery sub-module, wherein the sub-module comprises 1 or 2 or more soft pack batteries.
The invention also provides a method for manufacturing the battery module, which comprises the following steps:
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 fluid comprising at least 11% ethylene glycol and at least 10% water, or a lubricating oil.
The thickness of the soft package battery body is preferably 2.8-42 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.
Fourth part
The invention also provides a plurality of soft package battery module schemes as follows: the pouch battery module according to any one of the pouch battery module solutions described in the third section above, wherein the pouch battery is any one of the pouch battery solutions described in the second section above.
The following schemes are specifically included, and are only examples: a soft package battery module comprises a plurality of soft package batteries and a plurality of sealing frames which are stacked; the sealing frames comprise frame top edges and frame side edges positioned on one side or two sides of the frame top edges, the top edge of the soft package battery is arranged between the frame top edges of the two sealing frames, and at least one side of at least one frame top edge forms a sealing interface with at least one side of the top edge of the soft package 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 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 invention also provides a series of schemes C: the battery module of this aspect C has all the technical features of aspects a and B in the third section at the same time.
The invention also provides the following scheme:
scheme C1: 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 greater than 2001 volts; or/and, an electrical gap between the first aluminum foil layer and the second aluminum foil protective layer is greater than 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.
Scheme C2: according to the scheme C1, a second plastic insulating layer is further disposed between the aluminum-plastic film and the second aluminum foil protective layer, and the second plastic insulating layer wraps the electrode core to form a soft-package battery core, and then wraps the soft-package battery core for the second time.
Scheme C3: according to the scheme C1 or C2, the soft-pack battery module further comprises a plurality of sealing frames, each sealing frame comprises a sealing frame top edge and a sealing frame side edge, a sealing surface is formed between the sealing frame top edge and the top sealing edges of the soft-pack battery cells on two sides, and a sealing surface is formed between the sealing frame side edges and the side sealing edges of the soft-pack battery cells on two sides, so that the cooling liquid is in contact with the outermost packaging material on the body of the soft-pack battery cells and is not in contact with the trimming edges on the sealing edges of the soft-pack battery cells.
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.
Wherein, before the soft package battery cell is wrapped, the aluminum plastic film is separated from the second plastic insulating layer.
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.
Scheme C4 is according to any one of schemes C1-C3 above, and the pole piece of the soft package battery core is manufactured by adopting a lithium supplementing method according to scheme H below.
The invention also provides a manufacturing method scheme D 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.
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 invention also provides a rectangular aluminum hard shell battery module scheme E, 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.
In the case E2, the rectangular aluminum hard-shell battery module according to the case E, further, the rectangular aluminum hard-shell battery has a length of 601mm to 2499mm, and a ratio of length/thickness of between 24 and 207.
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.
Technical scheme I: 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 is provided with any one of the battery modules.
Further, the capacitance in the energy storage device is in the range of 1.7-970 kilowatt-hours.
The invention also provides a mobile device which is provided with any energy storage device and at least 2 radars.
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.
Drawings
Fig. 1 shows a schematic view of an a-pouch cell having a body 13 and 1 top seal 11 and 2 side seals 12, with the heat seal 12 having a cut edge 120.
The schematic view of the cross section (i.e., the cut edge) 120 of the outermost edge of the sealed edge of the pouch cell 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 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.
Fig. 5 is a pouch battery module including a pouch battery 1, a sealing frame 2, and a coolant container 3.
The inner core of the soft package battery module of fig. 6 comprises 14 soft package batteries, 21 sealing frames and 8 separators.
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 edge 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. 8 shows a B-type flexible battery (left view) and a sealing frame thereof (right view), the flexible battery includes a first tab 141 and a second tab 142, and the first tab 141 and the second tab 142 are respectively located at two opposite sides of the flexible battery body 131.
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 is two soft package batteries 1B and is clamped with a piece of elastic foam 15, and the left graph does not show an anti-corrosion layer; the right side is a sectional view 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 on the outside of the soft pack batteries 1B.
Fig. 11 and 12 are schematic diagrams of two measurement modes of the distance between the first metal layer and the second metal layer.
Detailed Description
Soft pack battery cooling device embodiment
A soft package battery cooling device comprises a soft package battery and a cooling liquid, wherein the soft package battery is in direct contact heat exchange with the cooling liquid; the soft package battery is wrapped by a soft package material, wherein the soft package material comprises a first resin layer (polypropylene resin layer), a first metal layer (aluminum alloy layer) and a second resin layer (nylon layer and/or PET layer); a second metal layer (aluminum alloy layer) is also wrapped outside the second resin layer. The cut edges of the flexible packaging material are subjected to insulation treatment so as to prevent the first metal layer from being exposed. The insulation treatment mode adopts an insulation film for sealing and wrapping; or the soft package battery is sealed and folded to prevent the first metal layer from being exposed. 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.
Soft package battery module embodiment
Example 1
As shown in fig. 3, a soft package battery module is shown, the soft package battery is packaged by an aluminum plastic film, the module comprises 14 soft package batteries 1 (a soft package battery) and a sealing frame 2, and a body 13 of the soft package battery 1 is soaked in cooling liquid to be in direct contact with the cooling liquid for heat exchange; the sealing frame 2 comprises a top edge 21 and side edges 22 positioned on two sides of the top edge, the top edge 21 of the frame forms a sealing interface with the top edge 11 of the battery 1, and cooling liquid is sealed to avoid overflow; the inner side of the side 22 of the sealing frame 2 forms a sealing interface with the side 12 of the battery 1, and the outer sides of the adjacent two frame sides form a sealing interface, which seals the cooling liquid from contact with the cut edges of the pouch battery. The cooling liquid is an antifreezing liquid containing glycol and 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 edge sealing of the soft package battery contains 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 needs 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 edge sealing on the side surface of the soft package battery, so that the edge sealing of the soft package battery is sealed in the elastic sealing piece.
The sealing frame has a ≡type structure and comprises a frame top edge 21, a frame 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.
The side of the sealing frame is provided with a cavity 221, or a cavity 221 is formed between the side of the 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 and then contacts with the soft package 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).
The present invention contrasts with the following different sealing means,
sealing mode A: only the top edge is sealed and the side edges are exposed to water.
The cost is higher, about 12 yuan
Poor reliability, easy 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.
Sealing mode B: sealing all edges of battery cell by adopting EPDM rubber sealing strip
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.
Sealing mode C: sealing all edges of the battery cell by adopting sealant sealing
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.
It can be found that in the sealing mode, the water vapor permeability of the battery cell is greatly reduced after all edge sealing of the battery cell is performed, 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. 8, and the positive tab 141 and the negative tab 142 are respectively formed 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.
As shown in fig. 11, 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.
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 (3)

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;
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.
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;
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.
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.
CN202111111782.2A 2021-09-20 2021-09-20 energy storage device Pending CN116845415A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111111782.2A CN116845415A (en) 2021-09-20 2021-09-20 energy storage device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111111782.2A CN116845415A (en) 2021-09-20 2021-09-20 energy storage device

Publications (1)

Publication Number Publication Date
CN116845415A true CN116845415A (en) 2023-10-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
CN (1) CN116845415A (en)

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