CN220895739U - Battery pack, energy storage system and electricity utilization device - Google Patents

Abstract

The application discloses a battery pack, an energy storage system and an electricity utilization device, wherein the battery pack comprises: the battery monomer and heating element, battery monomer is a plurality of, and a plurality of battery monomer are arranged in rows along first direction, arrange in rows along the second direction, first direction and second direction quadrature, heating element sets up between two adjacent battery monomer, heating element includes heating portion and the buffer portion of extending along the second direction, heating portion and buffer portion range upon range of setting in first direction, heating portion is suitable for heating battery monomer and buffer portion, buffer portion is suitable for compression shrink and thermal expansion with flexible deformation to make heating element and battery monomer laminating. Therefore, the probability of dry heating of the heating component can be reduced, the safety and the reliability of the battery pack are improved, and when the battery monomer is deformed, the area of a heat conduction interface between the heating component and the battery monomer can be kept stable, so that the heating effect and the heating efficiency can be improved.

Description

Battery pack, energy storage system and electricity utilization device

Technical Field

The application relates to the technical field of battery packs, in particular to a battery pack, an energy storage system and an electric device.

Background

The battery cells in the battery pack need to be controlled at a proper temperature, and the thermal runaway risk exists when the temperature is too high, so that the capacity of the battery pack is attenuated (namely, the cruising is folded in daily life) when the temperature is too low.

In the related art, the cooling of the battery monomer is realized through the liquid cooling plate, the heating of the battery monomer is realized through arranging structures such as a heating film and a heating patch, and the heating film, the heating patch and the battery monomer are attached to transfer heat, but expansion and contraction exist in the charging and discharging process of the battery monomer, so that the attachment between the battery monomer and the heating film and between the battery monomer and the heating patch is possibly not tight, a dry heating phenomenon occurs, the reliability of a battery pack is reduced, and the heating performance is also deteriorated.

Disclosure of utility model

The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present application is to provide a battery pack that has a better heating effect and higher reliability in use.

The application further provides an energy storage system adopting the battery pack.

The application further provides an electric device with the battery pack.

In a first aspect, the present application provides a battery pack comprising: the battery monomer and heating element, battery monomer is a plurality of, and a plurality of battery monomer is arranged in the row along first direction, arrange in the row along the second direction, first direction with the second direction is orthogonal, heating element sets up two adjacent rows between the battery monomer, heating element includes along the heating portion and the buffer portion that the second direction extends, heating portion with the buffer portion is in the range upon range of setting in the first direction, heating portion is suitable for the heating battery monomer and buffer portion, the buffer portion is suitable for compression shrink and thermal expansion with flexible deformation, and makes heating element with the battery monomer laminating.

According to the battery pack disclosed by the embodiment of the application, the heating component comprises the heating part and the buffer part, the buffer part and the battery monomer can be heated through the heating part, and the buffer part can generate flexible deformation, so that the bonding effect of the battery monomer and the heating component is better, the probability of dry heating of the heating component is reduced, the safety and the reliability of the battery pack are improved, the potential safety hazard is reduced, and when the battery monomer is deformed, the area of a heat conduction interface between the heating component and the battery monomer can be kept stable, and the heating effect and the heating efficiency of the heating component can be further improved.

According to some embodiments of the application, the heating assembly comprises: the flexible film is in sealing connection with the substrate, a buffer heat-conducting medium is filled between the substrate and the flexible film, the buffer heat-conducting medium and the flexible film define the buffer part, and a heating element is embedded in the substrate to define the heating part.

In the above technical scheme, the flexible membrane is matched with the liquid buffer heat-conducting medium to realize flexible deformation, and gravity potential energy changes to realize resetting to an initial state, and in the flexible deformation process, the liquid level (liquid level height) of the liquid buffer heat-conducting medium changes, so that the heat conduction interface area can be increased, the heating effect and the heating efficiency are primarily improved, and the gasified buffer heat-conducting medium duty ratio is gradually increased along with the increase of the heating time and the temperature rise in the working environment, and the liquid buffer heat-conducting medium duty ratio is gradually reduced, so that the flexible membrane expands, the gap between the flexible membrane and the battery monomer can be further filled, the heat conduction interface area is further increased, the attaching effect of the heat conduction interface is improved, and the heating effect and the heating efficiency can be further improved correspondingly.

According to some embodiments of the application, the buffer heat transfer medium is configured as an insulating coolant.

In the technical scheme, the insulating cooling liquid is used as the buffer heat-conducting medium, when the buffer heat-conducting medium in the heating assembly leaks, the short circuit phenomenon of surrounding parts can not occur, the use safety and reliability of the battery pack can be further improved, the potential safety hazard is reduced, meanwhile, the buffer heat-conducting medium also has certain heat absorption capacity in a non-cold environment, and the auxiliary heat dissipation of the battery monomer can be realized in some use scenes.

According to some embodiments of the application, the heating portion is configured as a positive temperature coefficient thermistor.

In the above technical scheme, the heating part can be embedded on the substrate or wound on the substrate, the higher the temperature of the heating part is, the larger the resistance is, when the temperature is too high, the resistance of the heating part is increased to a larger value, and at the moment, the heating part is equivalent to open circuit, so that overheat protection can be realized, overheat protection function is realized, and the use safety and reliability of the heating component are improved.

According to some embodiments of the application, the heating assembly includes a buffer layer defining the buffer portion and a heating film on both sides of the buffer layer defining the heating portion.

In the technical scheme, the area of the heat conduction interface between the battery monomer and the heating film can be kept stable, and the heating efficiency and the heating effect are improved.

According to some embodiments of the application, the buffer layer is configured as a foam layer.

In the technical scheme, the foaming layer can be heated and expanded, and when the heating film is heated in a dry burning mode, foam is heated and expanded so as to push the heating film to be attached to the battery monomer, dry burning is improved, heating effect and heating efficiency are improved, potential safety hazards are reduced, and reliability is improved.

According to some embodiments of the application, the buffer layer comprises: the buffer structure comprises a first sub-buffer layer and second sub-buffer layers positioned on two sides of the first sub-buffer layer, wherein the first sub-buffer layer and the second sub-buffer layer are made of different materials.

According to some embodiments of the application, the first sub-buffer is configured as an airbag layer.

According to some embodiments of the application, the second sub-buffer is configured as a foam layer.

In the above-mentioned technical scheme, can make the heating film be located between the adjacent battery monomer to can be in interference compression assembly, when the battery monomer appears deforming, can extrude bubble cotton and gasbag, the gasbag warp, so that heating film and battery monomer laminate steadily, and when the heating film appears dry combustion method, the inside gas of gasbag can be heated and expanded, in order to promote the heating film and move towards battery monomer, improve heating effect and heating efficiency.

According to some embodiments of the application, the balloon layer has a plurality of balloons therein, the balloons being filled with a thermally expansive medium. In the technical scheme, the air bag can be driven to expand by the heated expansion medium to absorb the gap between the heating film and the battery monomer, so that the probability of dry burning of the heating film is reduced.

According to some embodiments of the application, the heating element has a dimension in the first direction of 0.5mm to 20mm.

In the above technical scheme, the thickness of the heating assembly is more reasonable, and the expansion absorption capacity, the heating capacity and the bonding capacity (the capacity of enabling the heating assembly to be bonded with the battery monomer) of the heating assembly are considered.

According to some embodiments of the application, each column of the battery cells is further provided with an end plate at both ends in the second direction, and the end of the buffer portion in the second direction is connected to the end plate by a fastener.

In the technical scheme, the fixing stability and reliability between the heating component and the battery monomer can be improved, double faced adhesive tape is not required to be arranged, the connection stability of the heating component is less affected by aging, and the stability is higher.

According to some embodiments of the application, the heating assembly further comprises: the connecting plates extend along the first direction, and the end parts of the buffer parts adjacent to each other in the first direction are connected through the connecting plates.

In the above technical scheme, when having many battery cells in battery package or battery module, set up a row of heating unit between the adjacent battery cell, and many heating unit all link to each other with the connecting plate, can reduce heating element's the degree of difficulty of arranging, improve heating element's the convenience of arranging, and the connecting plate also can be fixed with the end plate, further improve heating element's fixed stability and reliability.

In a second aspect, the present application provides an energy storage system comprising: the battery pack described in the above embodiment.

In a third aspect, the present application provides an electrical device comprising: the battery pack described in the above embodiment.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Drawings

The foregoing and/or additional aspects and advantages of the application will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic diagram of an electrical device according to an embodiment of the present application;

Fig. 2 is a schematic view of a battery pack according to an embodiment of the present application;

FIG. 3 is a schematic view of a heating assembly according to a first embodiment of the application;

Fig. 4 is a schematic diagram showing the cooperation of the heating assembly and the battery cell according to the first embodiment of the present application;

FIG. 5 is a schematic view of a heating assembly according to a second embodiment of the application;

Fig. 6 is a schematic diagram showing the cooperation of a heating assembly and a battery cell according to a second embodiment of the present application;

FIG. 7 is a schematic view of a heating assembly according to a third embodiment of the present application;

Fig. 8 is a schematic diagram illustrating the cooperation of a heating assembly and a battery cell according to a third embodiment of the present application;

fig. 9 is a schematic view showing the cooperation of a heating assembly, a battery cell, and an end plate according to a first embodiment of the present application;

Fig. 10 is a schematic view of the mating of a heating assembly, battery cells, and end plates according to a second embodiment of the application;

fig. 11 is a schematic view showing the cooperation of a heating assembly, a battery cell, and an end plate according to a third embodiment of the present application;

fig. 12 is a schematic view of a battery module according to an embodiment of the present application;

fig. 13 is a schematic view of a heating element according to an embodiment of the present application.

Reference numerals:

the battery pack 100 is provided with a battery pack,

The battery cell 10 is formed of a plurality of battery cells,

Heating element 20, buffer portion 201, heating portion 202, connection plate 203, substrate 21a, heating element 211a, flexible film 22a, buffer layer 21b, first sub-buffer layer 211b, second sub-buffer layer 212b, heating film 22b,

The end plate 30 is provided with a pair of grooves,

The power consumption device 200, the controller 300, the motor 400, the case 500, and the battery module 600.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

The term "and/or" in the present application is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.

In the embodiments of the present application, the same reference numerals denote the same components, and detailed descriptions of the same components are omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are merely illustrative and should not be construed as limiting the application in any way.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

In the description of the application, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by another feature therebetween.

In the description of the application, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature.

The term "plurality" as used herein refers to two or more (including two).

In the embodiment of the application, the heating component 20 can be applied to heating the battery cell 10, the activation energy of electrolyte inside the battery cell 10 is reduced due to lower environmental temperature in some severe cold use environments, such as use scenes in winter in north, and the efficiency of the battery cell 10 is reduced.

The battery cell 10 may be a secondary battery, and the secondary battery refers to the battery cell 10 that can be continuously used by activating the active material by charging after the battery cell 10 is discharged.

The battery cell 10 may be a lithium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, or the like, which is not limited by the embodiment of the application.

The battery pack 100 according to the embodiment of the present application refers to a single physical module including one or more battery cells 10 to provide higher voltage and capacity. When there are a plurality of battery cells 10, the plurality of battery cells 10 are connected in series, in parallel or in series-parallel through the bus bar member.

In some embodiments, a plurality of battery cells 10 may be formed into a battery module 600, that is, when there are a plurality of battery cells 10, the plurality of battery cells 10 are arranged and fixed to form one battery module 600.

In some embodiments, the battery pack 100 includes a case 500 and a battery cell 10, at least one battery cell 10 or at least one battery module 600 is received in the case 500, the case 500 has a receiving space, and at least one battery cell 10 or at least one battery module 600 is received in the receiving space.

In some embodiments, the tank 500 may be part of the chassis structure of the vehicle. For example, portions of the tank 500 may become at least a portion of the floor of the vehicle, or portions of the tank 500 may become at least a portion of the cross members and stringers of the vehicle.

In some embodiments, the battery pack 100 or the battery module 600 may be part of an energy storage system. The energy storage system can be an energy storage container, an energy storage electric cabinet and the like, and a battery and an energy closing module are integrated in the energy storage system.

The development of battery technology is to consider various design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate, and other performance parameters, and further, the safety performance of the battery is also required to be considered.

It will be appreciated that, because of the strong temporal and spatial nature of the energy source required by humans, in order to make reasonable use of the energy source and to increase the energy utilization, it is necessary to store one form of energy in the same or in another form of energy by means of a medium or device, and then release it in a specific form of energy based on future application needs. As is well known, to achieve the great goal of carbon neutralization, green energy is currently mainly used to replace fossil energy so as to achieve the purpose of generating green electric energy.

The existing green energy mainly comprises light energy, wind energy, water potential and the like, and the problems of strong intermittence and large fluctuation of the light energy, the wind energy and the like generally exist, so that the voltage of a green power grid is unstable (insufficient electricity is used in a peak and too much electricity is used in a valley), and the unstable voltage can cause damage to the electric power, so that the problem of 'wind abandoning and light abandoning' is possibly caused by insufficient electricity demand or insufficient power grid receiving capability.

In order to solve the problem of insufficient power demand or insufficient power grid acceptance, an energy storage system and the like are required. The energy storage system converts the electric energy into other forms of energy through physical or chemical means to store the energy, and the energy stored by the energy storage system is converted into the electric energy to be released when needed.

The existing energy storage (i.e. energy storage) has a wide application range, including power generation side energy storage, power grid side energy storage, renewable energy grid-connected energy storage, user side energy storage and other aspects, and the types of corresponding energy storage systems include:

(1) The large energy storage container applied to the energy storage scene at the power grid side can be used as a high-quality active and reactive power regulation power supply in the power grid, so that the load matching of electric energy in time and space is realized, the renewable energy consumption capability is enhanced, and the large energy storage container has great significance in the aspects of standby of a power grid system, relieving peak load power supply pressure and peak regulation and frequency modulation;

(2) The main operation modes of the small and medium-sized energy storage electric cabinet applied to the industrial and commercial energy storage scenes (banks, shops and the like) at the user side and the household small-sized energy storage box applied to the household energy storage scene at the user side are peak clipping and valley filling. Because of the large price difference of the electricity charge at the peak-valley position according to the electricity consumption requirement, after the energy storage equipment is arranged by a user, in order to reduce the cost, the energy storage cabinet/box is charged usually in the electricity price valley period; and in the peak period of electricity price, the electricity in the energy storage equipment is released for use, so that the purpose of saving electricity charge is achieved. In addition, in remote areas and areas with high occurrence of natural disasters such as earthquake, hurricane and the like, the existence of the household energy storage system is equivalent to that a user provides a standby power supply for the user and the power grid, so that inconvenience caused by frequent power failure due to disasters or other reasons is avoided.

In combination with the above-mentioned case of energy storage by physical or electrochemical means, for example, the electrochemical energy storage system may include at least one battery, and the chemical elements in the battery are used as the energy storage medium, so as to implement the charging and discharging process through the chemical reaction or change of the energy storage medium. In short, the electric energy generated by light energy and wind energy is stored in at least one battery through chemical reaction or change of an energy storage medium, and when the use of external electric energy reaches a peak, the electric quantity stored in at least one battery is released for use through the chemical reaction or change of the energy storage medium, or is transferred to a place with short electric quantity for reuse.

In summary, the battery cell 10 is used as a minimum energy unit of the battery module 600, the battery pack 100, and the energy storage system, the battery module 600 or the battery pack 100 includes a plurality of battery cells 10, the battery cells 10 include a large battery surface defined by a width edge and a length edge of the battery cell 10, a small battery surface defined by a width edge and a height edge, and a battery end surface defined by a length edge and a width edge, and in order to make the battery cell 10 usable in a cold environment, a heating film may be attached to a surface (such as a large battery surface, a small battery surface, or a battery end surface) of the battery cell 10.

However, the heating film is attached to the surface of the battery cell 10, and the battery cell 10 expands and contracts in the charge and discharge process, which may cause the heating film to be separated from the battery cell 10, resulting in dry heating and tearing risk of the heating film, potential safety hazard, and reduced heating effect and heating efficiency.

In view of this, the embodiment of the present application provides a battery pack 100, in which the heating assembly 20 in the battery pack 100 can generate adaptive deformation based on expansion and contraction of the battery cells 10 in the battery pack 100, so that the heating assembly 20 and the battery cells 10 are more attached to each other, which not only can improve the heating effect and the heating efficiency, but also can reduce the risk of dry combustion and reduce the potential safety hazard.

The technical solution described in the embodiments of the present application is applicable to the battery pack 100 and the power consumption device 200 using the battery pack 100.

The power consumption device 200 may be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the present application does not particularly limit the above-described power consumption device 200.

For convenience of description, the following embodiment will be described taking the electric device 200 as an example of a vehicle.

Referring to fig. 1, a schematic structural diagram of a vehicle according to some embodiments of the application is shown. The interior of the vehicle is provided with a battery pack 100, and the battery pack 100 may be provided at the bottom or the head or the tail of the vehicle. The battery pack 100 may be used for power supply of a vehicle, for example, the battery pack 100 may be used as an operating power source of the vehicle.

The vehicle may further include a controller 300 and a motor 400, the controller 300 being configured to control the battery pack 100 to power the motor 400, the motor 400 being configured as a load, for example, for operating power requirements during start-up, navigation, and travel of the vehicle.

In some embodiments of the present application, the battery pack 100 may be used not only as an operating power source for a vehicle, but also as a driving power source for a vehicle, instead of or in part instead of fuel oil or natural gas, to provide driving power for the vehicle.

Referring to fig. 2, fig. 2 is an exploded view of a battery pack 100 according to some embodiments of the present application. The battery pack 100 includes a battery module 600 and a case 500, and the case 500 is used to house the battery module 600.

The case 500 is a member for accommodating the battery module 600, the case 500 provides a placement space for the plurality of battery cells 10 in the battery module 600, and the case 500 may have various structures. In some embodiments, the case 500 may include a tray and the case 500, the tray and the case 500 being overlapped with each other to define a placement space for receiving the battery cell 10. The tray and the case 500 may have various shapes, such as a rectangular parallelepiped, a cylinder, etc. The tray may have a hollow structure with one side opened, and the case 500 may have a space for placing the case 500 when the open side of the case 500 is closed to the open side of the tray. The tray may have a hollow structure with one side opened, and the case 500 may have a plate-like structure, and the case 500 may be covered on the open side of the tray to form the case 500 having a space for placement. As an example, the battery cell 10 may be a cylindrical battery cell 10, a prismatic battery cell 10, a pouch battery cell 10, or other shaped battery cell 10, and the present application is not particularly limited.

In the battery pack 100, the number of battery cells 10 may be one or more. If there are multiple battery cells 10, the multiple battery cells 10 may be connected in series or parallel or a series-parallel connection, where a series-parallel connection refers to that there are both series connection and parallel connection among the multiple battery cells 10. The battery modules 600 may be formed by connecting a plurality of battery cells 10 in series or parallel or series-parallel connection, and the plurality of battery modules 600 are then connected in series or parallel or series-parallel connection to form a whole and are accommodated in the case 500. All the battery cells 10 may be directly connected in series, parallel or series-parallel, and then the whole body formed by all the battery cells 10 is accommodated in the case 500.

A battery pack 100, an energy storage system, and an electric device 200 according to an embodiment of the present application are described below with reference to fig. 1 to 13.

As shown in fig. 2 and 12, the present application provides a battery pack 100 including: the battery monomer 10 and the heating component 20, the heating component 20 can be arranged between adjacent battery monomers 10, such as between the large battery surfaces of the adjacent battery monomers 10, between the small battery surfaces of the adjacent battery monomers 10 and between the battery end surfaces of the adjacent battery monomers 10, so that the battery monomers 10 are heated through the heating component 20, the working temperature of the battery monomers 10 is improved, the activation energy of electrolyte in the battery monomers 10 is improved, the endurance discount of the battery monomers 10 is reduced, and the energy storage capacity attenuation of the battery monomers 10 is improved.

It should be noted that, the number of the battery cells 10 in the battery pack 100 is plural, the plural battery cells 10 may be arranged in an array, or the plural battery cells 10 may form at least one battery module 600, and plural battery cells arranged in an array or a single row are arranged in one battery module 600, and the plural battery cells are connected in series, parallel or series-parallel to output electric energy according to a required voltage.

The plurality of battery cells 10 are arranged in rows along a first direction, and the plurality of battery cells 10 are arranged in rows along a second direction, wherein the first direction is orthogonal to the second direction.

Illustratively, the plurality of battery cells 10 in the same row may be disposed with the battery large surfaces facing each other in the first direction, and the plurality of battery cells 10 in the same row may be disposed with the battery small surfaces facing each other in the second direction, and the first direction may be the length direction, and the second direction may be the width direction, or of course, the first direction may be disposed with the battery small surfaces facing each other, and the second direction may be disposed with the battery large surfaces facing each other.

Further, the heating unit 20 is disposed between two adjacent rows of the battery cells 10, the heating unit 20 includes a heating portion 202 and a buffer portion 201 extending in the second direction, the heating portion 202 and the buffer portion 201 are stacked in the first direction, the heating portion 202 is adapted to heat the battery cells 10 and the buffer portion 201, and the buffer portion 201 is adapted to be compressed and expanded by compression and thermal expansion to flexibly deform and to attach the heating unit 20 to the battery cells 10.

That is, the heating portion 202 and the buffer portion 201 of the heating assembly 20 extend in the second direction, are located between two adjacent rows of the battery cells 10 in the first direction, and are adapted to heat the two rows of the battery cells 10 on the large battery surface or the small battery surface of the two rows of the battery cells 10.

Note that, the heating portion 202 and the buffer portion 201 may be stacked in the first direction, and the heating portion 202 and the buffer portion 201 may be stacked in the first direction, or the heating portion 202 and the buffer portion 201 may be stacked in the first direction, for example: the heating assembly 20 includes one heating part 202 and two buffer parts 201, the heating parts 202 being located at both sides of the buffer parts 201, or the heating assembly 20 includes two buffer parts 201 and one heating part 202, the buffer parts 201 being located at both sides of the heating parts 202.

It will be appreciated that the buffer portion 201 may be made of a flexible material or a flexible film 22a may be used to cover a liquid or gaseous material, so as to implement flexible deformation, the heating portion 202 may be configured as an electrical heating structure such as a resistor, and the flexible deformation of the buffer portion 201 may include shape recovery under the action of elastic potential energy, shape recovery under the action of gravitational potential energy, and so on, so as to deform the battery cell 10, for example: when the battery cell 10 expands or contracts, the surface of the battery cell 10 opposite to the heating assembly 20 may bulge, at least part of the buffer portion 201 may be compressed to be attached to the bulge, other parts of the buffer portion 201 may be attached to the non-bulge part, or the battery cell 10 may be spaced apart from at least part of the heating assembly 20, and as the temperature of the heating portion 202 increases, at least part of the buffer portion 201 may be thermally expanded and fill the gap between the battery cell 10 and the heating assembly 20, so that the attaching effect between the battery cell 10 and the heating assembly 20 is better, the heat conduction interface area between the battery cell 10 and the heating assembly 20 is larger, and the area of the heat conduction interface may remain stable, so that the heating efficiency and the heating effect are better.

According to the battery pack 100 of the embodiment of the application, the heating assembly 20 comprises the heating portion 202 and the buffer portion 201, the buffer portion 201 and the battery cell 10 can be heated by the heating portion 202, and the buffer portion 201 can generate flexible deformation, so that the bonding effect of the battery cell 10 and the heating assembly 20 is better, the probability of dry heating of the heating assembly 20 is reduced, the safety and the reliability of the battery pack 100 are improved, the potential safety hazard is reduced, and when the battery cell 10 is deformed, the area of a heat conduction interface between the heating assembly 20 and the battery cell 10 can be kept stable, and the heating effect and the heating efficiency of the heating assembly 20 can be further improved.

It should be noted that, the flexible deformation of the buffer portion 201 in the embodiment of the present application needs to achieve at least compression shrinkage and thermal expansion, and correspondingly, compression shrinkage and elastic potential energy recovery, compression shrinkage and thermal expansion, and various combinations of compression shrinkage, gravitational potential energy recovery and thermal expansion may be achieved, and several possible implementations of the embodiment of the present application will be specifically described below with three specific examples, and it should be understood that the exemplary descriptions of the present application are only for facilitating understanding of the technical solution of the present application by those skilled in the art, and are not exhaustive.

First embodiment:

As shown in fig. 3 and 4, in the first embodiment, the heating assembly 20 includes: the substrate 21a and the flexible films 22a located on both sides of the substrate 21a, the flexible films 22a are connected with the substrate 21a in a sealing way, a buffer heat conducting medium is filled between the substrate 21a and the flexible films 22a, the buffer heat conducting medium and the flexible films 22a define a buffer part 201, and a heating element 211a is embedded in the substrate 21a to define a heating part 202.

Specifically, the peripheral edge of the flexible film 22a is hermetically connected to the substrate 21a, so as to define a flexible space between the flexible film 22a and the substrate 21a on at least one side surface in the first direction, where the flexible space may be filled with a buffer heat-conducting medium, and the flexible film 22a may deform after being pressed by flexibility, where the buffer heat-conducting medium is a liquid medium, such as: the cooling liquid and the like, along with the deformation of the flexible film 22a, the buffer heat-conducting medium can flow so as to adapt to the deformation of the battery cell 10, after the deformation of the battery cell 10 occurs, the flexible film 22a deforms so that the flexible film 22a is always attached to the battery cell 10, part of the heat exchange surface of the battery cell 10 and the heating part 202 can realize indirect heat exchange through the gas in the flexible film 22a, the other part of the heat exchange surface of the battery cell 10 and the heating part 202 can realize indirect heat exchange through the buffer heat-conducting medium, after the deformation of the flexible film 22a, the liquid level of the corresponding buffer heat-conducting medium gradually rises, the area of the gas indirect heat-exchanging part gradually decreases, the heat exchange effect and the heat exchange efficiency gradually rise, and after the heating or the stop of the heating is completed, the buffer heat-conducting medium can be restored to the initial state under the action of gravity.

Meanwhile, in the continuous heating process of the heating part 202 on the buffer heat-conducting medium, the gasified buffer heat-conducting medium is gradually increased in proportion, and the liquid buffer heat-conducting medium is gradually decreased in proportion, so that the flexible film 22a expands, the gap between the flexible film 22a and the battery cell 10 can be further absorbed, the area of the heat conduction interface between the heating assembly 20 and the battery cell 10 can be increased, and the heat exchange effect and the heat exchange efficiency are improved.

That is, in the first embodiment, the flexible film 22a is matched with the liquid buffer heat conducting medium to realize flexible deformation, and gravity potential energy changes to realize resetting to an initial state, in the flexible deformation process, the liquid level (liquid level height) of the liquid buffer heat conducting medium changes, so that the heat conduction interface area can be increased, the heating effect and the heating efficiency can be primarily improved, and as the heating time increases and the temperature in the working environment rises, the gasified buffer heat conducting medium duty ratio gradually increases, and the liquid buffer heat conducting medium duty ratio gradually decreases, so that the flexible film 22a expands, the gap between the flexible film 22a and the battery cell 10 can be further filled, the heat conduction interface area is further increased, the attaching effect of the heat conduction interface is improved, and accordingly the heating effect and the heating efficiency can be further improved.

Note that the flexible film 22a may be any one of a PET (Polyethylene terephthalate, polyester resin) film, a PI (Polyimide) film, a PP (polypropylene) film, a PC (Polycarbonate) film, a PVC (Polyvinylchlorid, polyvinyl chloride) film.

It will be appreciated that in order to facilitate assembly of the flexible film 22a structure between the cells 10, a double sided adhesive structure may be provided between the flexible film 22a and the substrate 21a, between the flexible film 22a and the cells 10 at the time of initial assembly, and may be removed after assembly is completed.

According to some embodiments of the application, the buffer heat transfer medium is configured as an insulating cooling liquid.

Thus, when the buffer heat-conducting medium in the heating assembly 20 leaks, the buffer heat-conducting medium does not cause the short circuit phenomenon of surrounding components, so that the use safety and reliability of the battery pack 100 can be further improved, the potential safety hazard is reduced, and meanwhile, the buffer heat-conducting medium also has certain heat absorption capacity in a non-cold environment, and the auxiliary heat dissipation of the battery cell 10 can be realized in some use scenes.

According to some embodiments of the application, the heating portion 202 is configured as a positive temperature coefficient thermistor.

That is, the heating portion 202 may be embedded on the substrate 21a or wound around the substrate 21a, and when the temperature of the heating portion 202 is higher and the resistance is higher, the resistance of the heating portion 202 is raised to a higher value and the heating portion 202 is disconnected, so that overheat protection can be realized, thereby realizing overheat protection function and improving use safety and reliability of the heating assembly 20.

Second embodiment:

As shown in fig. 5 and 6, in the second embodiment, the heating assembly 20 includes a buffer layer 21b and heating films 22b located on both sides of the buffer layer 21b, the buffer layer 21b defining a buffer portion 201, and the heating films 22b defining a heating portion 202.

Specifically, the buffer layer 21b and the heating film 22b form a sandwich structure, in the first direction, the heating film 22b, the buffer layer 21b and the heating film 22b are stacked, in the first direction, the two heating films 22b are suitable for being attached to two battery monomers 10 adjacent to each other in the first direction, the two battery monomers 10 are heated by the two heating films 22b respectively, the buffer layer 21b is located between the two heating films 22b, when the battery monomers 10 expand, the buffer layer 21b can be compressed and contracted, so that the heating film 22b can adapt to the deformation of the battery monomers 10, the probability of cracking phenomenon after the heating film 22b is stressed is reduced, the heating film 22b can still be attached to the battery monomers 10, and after heating is stopped, the buffer layer 21b can return to an initial state under the action of elasticity, so that the heat conduction interface area between the battery monomers 10 and the heating film 22b is kept stable, and the heating efficiency and the heating effect are improved.

According to some embodiments of the application, the buffer layer 21b is configured as a foam layer.

Specifically, the foaming layer can be heated and expanded, and when the heating film 22b is heated and expanded, the foam is heated and expanded to push the heating film 22b to be attached to the battery cell 10, so that the dry heating phenomenon is improved, the heating effect and the heating efficiency are improved, the potential safety hazard is reduced, and the reliability is improved.

Third embodiment:

As shown in fig. 7 and 8, the buffer layer 21b includes: the first sub-buffer layer 211b and the second sub-buffer layer 212b located at two sides of the first sub-buffer layer 211b, wherein the first sub-buffer layer 211b and the second sub-buffer layer 212b are made of different materials.

That is, in the third embodiment, the buffer layer 21b is differentiated into a sandwich structure based on the second embodiment, the heating films 22b are further disposed on two sides of the buffer layer 21b, the buffer layer 21b includes a first sub-buffer layer 211b and a second sub-buffer layer 212b disposed on two sides of the first sub-buffer layer 211b, and the materials of the first sub-buffer layer 211b and the second sub-buffer layer 212b are different, so that one is formed into a thermal expansion structure, and the other is formed into a compressive deformation structure, or both can be thermally expanded and compressively deformed, but the deformation coefficients are different, so that the expansion coefficients are different.

Therefore, the same technical effects as those of the first embodiment and the second embodiment can be achieved, and the description thereof will not be repeated.

Illustratively, the first sub-buffer 211b is configured as an airbag layer; the second sub-buffer layer 212b is configured as a foam layer.

Therefore, the heating film 22b can be positioned between adjacent battery cells 10 and is in interference compression assembly, when the battery cells 10 deform, foam and air bags can be extruded, the air bags deform, so that the heating film 22b is stably attached to the battery cells 10, and when the heating film 22b is dry-burned, gas in the air bags can be heated and expanded to push the heating film 22b to move towards the battery cells 10, so that the heating effect and the heating efficiency are improved.

According to some embodiments of the application, there are a plurality of cells within a cell layer, the cells being filled with a heated inflation medium.

Specifically, the heated expansion medium may be inert gas, so that the heated expansion medium drives the air bag to expand, and the gap between the heating film 22b and the battery cell 10 is absorbed, so that the probability of dry burning of the heating film 22b is reduced.

As shown in fig. 9, 10 and 11, according to some embodiments of the present application, the dimension of the heating element 20 in the first direction is 0.5mm to 20mm.

Illustratively, the dimension of the heating element 20 in the first direction may be 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 15mm, 20mm, etc., which makes the thickness of the heating element 20 more reasonable, and gives consideration to the expansion absorption capacity, heating capacity, and fitting capacity (capacity of fitting the heating element 20 with the battery cell 10 more) of the heating element 20.

As shown in fig. 9, 10 and 11, according to some embodiments of the present application, each row of battery cells 10 is further provided at both ends in the second direction with end plates 30, and the ends of the buffer 201 in the second direction are connected to the end plates 30 by fasteners.

Specifically, the fastener can be rivet, screw, bolt etc. and through fastener fixed heating element 20 and battery cell 10, can improve the fixed stability and the reliability between heating element 20 and the battery cell 10, and need not to set up the double faced adhesive tape, heating element 20's connection stability receives ageing less influence, and stability is higher.

As shown in fig. 12 and 13, according to some embodiments of the application, the heating assembly 20 further includes: the connection plates 203, the connection plates 203 extend in the first direction, and the end portions of the buffer portions 201 adjacent in the first direction are connected by the connection plates 203.

Specifically, the heating assembly 20 may include a plurality of heating units, each of which is disposed between two columns of the battery cells 10, and the plurality of heating units may be connected by the connection plates 203 such that the heating assembly 20 may be arranged in a serpentine shape.

Therefore, when the battery pack 100 or the battery module 600 is provided with the plurality of rows of battery cells 10, a row of heating units are arranged between the adjacent rows of battery cells 10, and the plurality of rows of heating units are connected with the connecting plate 203, so that the arrangement difficulty of the heating assembly 20 can be reduced, the arrangement convenience of the heating assembly 20 can be improved, the connecting plate 203 can be fixed with the end plate 30, and the fixing stability and reliability of the heating assembly 20 can be further improved.

The present application provides an energy storage system comprising: the battery pack 100 in the above embodiment.

As shown in fig. 1 and 3, the present application provides an electric device 200, including: the battery pack 100 in the above embodiment.

According to the battery pack 100 of the embodiment of the application, the heating assemblies 20 may be disposed between adjacent rows of the battery cells 10, and the buffer portion 201 is adapted to buffer and absorb the expansion of the battery cells 10 or reduce the gap between the battery cells 10 and the heating assemblies 20, so that the area of the heat conduction interface may be kept stable or the area of the heat conduction interface may be increased, thereby improving the heating efficiency and the heating effect.

It should be noted that, the heating assembly 20 according to the embodiment of the present application may be configured such that the gravitational potential energy recovery initial state structure is matched with the liquid medium to be heated and expanded, or the elastic potential energy recovery initial assembly is matched with the heated expansion structure to achieve the above technical effects.

As shown in fig. 9, 10, 11 and 13, in the first embodiment, the number of the heating parts 202 and the buffer parts 201 of the heating assembly 20 may be plural and divided into a plurality of heating units, each of which is located between two adjacent columns of the battery cells 10, and the plurality of heating parts 202 and the buffer parts 201 in each of which may be disposed at intervals and connected by a plate body (e.g., a substrate) connected to the connection plate 203 such that the entire heating assembly 20 takes a shape of a belt; in the second embodiment, the buffer portion 201 is defined by a foam layer extending in the second direction, the foam layer serves as a supporting structure of the heating portion 202, the heating portion 202 is configured as a heating film, the support is provided by the foam layer, and both ends of the foam layer may be provided with rigid structures and connected to the end plates by the rigid structures, and the rigid structures at both ends of the foam layer are connected to the connecting plates 203, so that the entire heating assembly 20 may be in a belt shape; in the third embodiment, the buffer portion 201 is defined by a foam layer extending in the second direction and an air bag layer located inside the foam layer, the foam layer serves as a supporting structure for the heating portion 202, the air bag layer supports the air bag layer inside the foam layer, the heating portion 202 is configured as a heating film, support is provided by the foam layer, both ends of the foam layer may be provided with rigid structures and connected with the end plates by the rigid structures, the rigid structures at both ends of the foam layer are connected with the connecting plates 203 so that the entire heating assembly 20 may take the shape of a belt, the air bags in the air bag layer may be plural, the plural air bags are configured as strip-shaped air bags and extend in the second direction, or are configured as plural spherical air bags, and are sequentially provided in the second direction.

Other configurations and operations of the battery pack 100, the energy storage system, and the power consumption device 200 according to the embodiments of the present application are known to those skilled in the art, and will not be described herein.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the application, the scope of which is defined by the claims and their equivalents.

Claims (15)

1. A battery pack, comprising:

The plurality of battery cells (10) are arranged in rows along a first direction and in rows along a second direction, and the first direction is orthogonal to the second direction;

heating element (20), heating element (20) set up between two adjacent single battery (10), heating element (20) are including following heating portion (202) and buffer (201) that the second direction extends, heating portion (202) with buffer (201) are in range upon range of setting in the first direction, heating portion (202) are suitable for heating single battery (10) and buffer (201), buffer (201) are suitable for compression shrink and thermal expansion in order to flexibly deform, and make heating element (20) with single battery (10) laminating.

2. The battery pack according to claim 1, wherein the heating assembly (20) includes: the flexible film (22 a) is arranged on two sides of the substrate (21 a), the flexible film (22 a) is connected with the substrate (21 a) in a sealing mode, a buffer heat conducting medium is filled between the substrate (21 a) and the flexible film (22 a), the buffer heat conducting medium and the flexible film (22 a) define the buffer part (201), and a heating piece (211 a) is embedded in the substrate (21 a) to define the heating part (202).

3. The battery pack of claim 2, wherein the buffer heat transfer medium is configured as an insulating coolant.

4. The battery pack according to claim 2, wherein the heating portion (202) is configured as a positive temperature coefficient thermistor.

5. The battery pack according to claim 1, wherein the heating assembly (20) includes a buffer layer (21 b) and heating films (22 b) located at both sides of the buffer layer (21 b), the buffer layer (21 b) defining the buffer portion (201), the heating films (22 b) defining the heating portion (202).

6. The battery pack according to claim 5, wherein the buffer layer (21 b) is configured as a foam layer.

7. The battery pack according to claim 5, wherein the buffer layer (21 b) includes: the buffer structure comprises a first sub buffer layer (211 b) and second sub buffer layers (212 b) arranged on two sides of the first sub buffer layer (211 b), wherein the first sub buffer layer (211 b) and the second sub buffer layer (212 b) are made of different materials.

8. The battery pack according to claim 7, wherein the first sub-buffer layer (211 b) is configured as an airbag layer.

9. The battery pack of claim 7, wherein the second sub-buffer (212 b) is configured as a foam layer.

10. The battery pack of claim 8, wherein the bladder layer has a plurality of bladders filled with a thermally expansive medium.

11. The battery pack according to any one of claims 2-10, wherein the heating element (20) has a dimension in the first direction of 0.5 mm-20 mm.

12. The battery pack according to any one of claims 2 to 10, wherein each column of the battery cells (10) is further provided with end plates (30) at both ends in the second direction, and the end portions of the buffer portions (201) in the second direction are connected to the end plates (30) by fasteners.

13. The battery pack according to claim 12, wherein the heating assembly (20) further comprises: and a connection plate (203), wherein the connection plate (203) extends along the first direction, and the end parts of the buffer parts (201) adjacent to each other in the first direction are connected through the connection plate (203).

14. An energy storage system, comprising: the battery pack of any one of claims 1-13.

15. An electrical consumer (200), comprising: the battery pack of any one of claims 1-13.