CN214706098U

CN214706098U - Power battery

Info

Publication number: CN214706098U
Application number: CN202022614168.5U
Authority: CN
Inventors: 高焓; 刘金来; 郜奥林; 王刚; 刘宝俊; 陆宏伟; 姜欣宏; 赵龙智; 周东岳; 刘璐; 唐河森; 马聪; 吴振凯; 卢鹏; 李振凯; 孙恒盛; 闫波; 初征; 毛一年
Original assignee: Beijing Airlango Technology Co ltd
Current assignee: Beijing Airlango Technology Co ltd
Priority date: 2020-11-11
Filing date: 2020-11-11
Publication date: 2021-11-12
Anticipated expiration: 2030-11-11

Abstract

The embodiment of the disclosure provides a power battery. The power battery comprises a first graphite sheet, a shell and a plurality of electric core assemblies; the electric core assembly and the first graphite sheet are encapsulated in the shell; the electric core component comprises a plurality of electric cores, a gap exists between every two adjacent electric cores, the first graphite flake has a bending section, the bending section is embedded in the gap between the electric cores, the bending section has a buffering space, and under the condition that the volume of the electric core component is increased after discharge circulation, the volume of the buffering space is reduced. Like this, because first graphite flake has the section of bending, the section of bending inlays the dress in the clearance between the electric core, the section of bending has the buffering space, consequently, under the circumstances that the volume increases after the electric core subassembly discharge cycle, make the buffering space reduce along with the spaced reduction between two adjacent electric cores, when giving the quick heat dissipation of electric core subassembly through first graphite flake, also can provide the expanded space after the electric core subassembly discharge cycle, and then improve the security of electric core subassembly.

Description

Power battery

Technical Field

The embodiment of the disclosure relates to the technical field of electrochemistry, in particular to a power battery.

Background

With the continuous development of electrochemical technology, the requirements on the battery are higher and higher, so that the battery needs higher energy density, and with the increasing of the energy density of the battery, the heat generation amount of the battery is increased, wherein the heat generation amount of the power battery is particularly obvious. In order to conduct the heat generated by the power battery to the outside in time, the power battery generally needs to be cooled to dissipate the heat.

Currently, cooling methods of power batteries include active cooling and passive cooling. Wherein, active cooling is the heat dissipation method of forced convection through introducing modes such as air-cooled, liquid cooling, nevertheless because the volume that it needs to occupy is great, consequently is not applicable to the unmanned aerial vehicle field. Based on this, the unmanned aerial vehicle field adopts passive cooling's mode usually, and passive cooling's mode mainly relies on the inner structure of battery to dispel the heat. The battery with the uniform-temperature heat transfer structure comprises a plurality of battery cores and the uniform-temperature heat transfer structure, wherein the uniform-temperature heat transfer structure is positioned between two adjacent battery cores, the uniform-temperature heat transfer structure comprises a capillary tissue and a working fluid, and the effect of heat dissipation of the battery cores is achieved mainly by means of convection of heat at the uniform-temperature heat transfer structure.

However, the volume of the battery cell after discharge cycle is increased, and the temperature-equalizing heat transfer structure is located between two adjacent battery cells, so that a space for volume expansion of the battery cell is not reserved between the battery cells, and further, the safety and reliability are insufficient.

SUMMERY OF THE UTILITY MODEL

The embodiment of the disclosure provides a power battery and electronic equipment, so as to at least solve the problem that the volume expansion space of a battery core is not reserved between the existing battery cores, and further the safety and reliability of the power battery are not enough.

The embodiment of the disclosure discloses a power battery, which comprises a first graphite sheet, a shell and a plurality of electric core assemblies;

the electrical core assembly and the first graphite sheet are enclosed within the housing;

the cell assembly comprises a plurality of cells, a gap exists between every two adjacent cells, the first graphite sheet is provided with a bending section, the bending section is embedded in the gap between the cells, the bending section is provided with a buffer space, and under the condition that the volume of the cell assembly is increased after discharge circulation, the volume of the buffer space is reduced.

Optionally, the first graphite sheet further comprises a connecting segment;

the connecting section is tightly attached to the side face of the electric core assembly, wherein the connecting section is connected to two ends of the bending section.

Optionally, the connecting section comprises a first connecting section and a second connecting section;

the first linkage segment is connected the tip of second linkage segment, the second linkage segment with the both ends of the section of bending are connected, wherein, first linkage segment is hugged closely the first side setting of electric core subassembly, the second linkage segment is hugged closely the second side setting of electric core subassembly, wherein, first side with the second side does two sides of electric core subassembly mutually perpendicular, first linkage segment with the setting of buckling between the second linkage segment, the second linkage segment with the setting of buckling between the section of bending.

Optionally, the power battery further comprises two second graphite sheets; the shell comprises a battery upper shell and a battery lower shell;

the battery upper shell and the battery lower shell are detachably connected, the electric core component is embedded in a cavity formed between the battery upper shell and the battery lower shell, and a first gap is formed between two end faces of the electric core component and the inner wall of the battery lower shell;

the second graphite sheet is located in the first gap, and the two second graphite sheets respectively cover two end faces of the electric core assembly, wherein the end faces are two faces of the electric core assembly and two faces of the electric core assembly, which are vertical to the side faces.

Optionally, a bending section is embedded in a gap between the middle parts of every two adjacent battery cells.

Optionally, a bending section is embedded in a gap between two adjacent electric cores located in the middle of the electric core assembly.

Optionally, the bending section includes a first bending section and a second bending section;

the first bending section and the second bending section are arranged at intervals, the buffer space is formed between the first bending section and the second bending section, the first bending section is tightly attached to two adjacent heat dissipation surfaces in the battery cells, the second bending section is tightly attached to two adjacent heat dissipation surfaces in the battery cells, and the two adjacent heat dissipation surfaces are oppositely arranged.

Optionally, the gaps between the battery cells include a second gap and a third gap;

the second clearance is located the clearance between two adjacent electric cores of the first direction of electric core subassembly, the third clearance is located the clearance between two adjacent electric cores of the second direction of electric core subassembly, wherein, the first direction is the length direction of electric core subassembly, the second direction be with first direction vertically direction.

Optionally, the bending section is embedded in the second gap, or the bending section is embedded in the third gap, or both the second gap and the third gap are embedded with the bending section.

Optionally, the electric core assembly further comprises a polar lug plate, and the polar lug plate is electrically connected with the electric core assembly.

In the embodiment of the disclosure, since the power battery comprises the first graphite sheet, the casing and the plurality of electric core assemblies, the electric core assemblies and the first graphite sheet are packaged in the casing, the electric core assemblies comprise a plurality of electric cores, and a gap exists between every two adjacent electric cores, so that the gap between every two adjacent electric cores can provide a space for volume expansion after the discharge cycle of the electric core assemblies. Because first graphite flake has the section of bending again, the section of bending inlays the dress in the clearance between the electric core, the section of bending has the buffering space, consequently under the circumstances that the volume increases after the electric core subassembly discharge cycle, two adjacent electric cores are under the circumstances that constantly are close to promptly, the buffering space that the section of bending formed is extruded, make the buffering space reduce along with the spaced reduction between two adjacent electric cores, when giving the quick heat dissipation of electric core subassembly through first graphite flake, also can provide the expanded space for the electric core subassembly after the discharge cycle, and then improve the security of electric core subassembly.

The foregoing description is only an overview of the technical solutions of the present disclosure, and the embodiments of the present disclosure are described below in order to make the technical means of the present disclosure more clearly understood and to make the above and other objects, features, and advantages of the present disclosure more clearly understandable.

Drawings

In order to more clearly illustrate the technical solutions of the present disclosure, the drawings needed to be used in the description of the present disclosure will be briefly introduced below, and it is apparent that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.

Fig. 1 is a schematic structural diagram of a power battery provided in an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of an electrical core assembly provided in embodiments of the present disclosure;

fig. 3 is a first schematic illustration of an assembly of an electrical core assembly and a first graphite sheet provided in embodiments of the present disclosure;

fig. 4 is a second schematic illustration of an assembly of an electrical core assembly and a first graphite sheet provided in embodiments of the present disclosure;

fig. 5 is a third schematic illustration of an assembly of an electrical core assembly and a first graphite sheet provided in embodiments of the present disclosure;

fig. 6 is a fourth schematic illustration of an assembly of an electrical core assembly and a first graphite sheet provided in embodiments of the present disclosure.

Reference numerals:

1-a first graphite sheet; 2-a shell; 3-an electrical core assembly; 4-a second graphite sheet; 5 pole ear plates; 11-bending section; 12-a connecting segment; 21-upper battery shell; 22-battery lower case; 31-electric core; 111-a first bend section; 112-a second bending section; 113-a first gap; 121 — a first connecting section; 122-a second connection segment; 311-a second gap; 312-third gap.

Detailed Description

The technical solutions in the present disclosure will be described clearly and completely with reference to the accompanying drawings in the present disclosure, and it is obvious that the described embodiments are some, not all embodiments of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

The power battery provided by the present disclosure is described in detail below by exemplifying several specific embodiments.

Referring to fig. 1, the disclosed embodiment provides a power battery including a first graphite sheet 1, a case 2, and a plurality of cell assemblies 3; the electric core assembly 3 and the first graphite sheet 1 are encapsulated in the shell 2; the battery assembly 3 includes a plurality of battery cores 31, there is a gap between every two adjacent battery cores 31, the first graphite sheet 1 has a bending section 11, the bending section 11 is embedded in the gap between the battery cores 31, wherein, the bending section 11 has a buffer space, and under the condition that the volume is increased after the discharge cycle of the battery assembly 3, the volume of the buffer space is reduced.

Specifically, the housing 2 is a supporting body for supporting the cell assembly 3, and may be a square housing, and has an accommodating cavity inside to provide an accommodating space and a reaction site for the cell assembly 3. The shell 2 should have the characteristics of nai, heat-resisting, shock-proof, like polypropylene plastic material, make shell 2 still have certain intensity when having acidproof, heat-resisting, shock-proof properties, and the thickness of shell 2 is thinner, and weight is lighter, is suitable for the equipment that needs lightweight power battery to use as the power supply, like small-size unmanned aerial vehicle equipment.

The electric core assembly 3 and the first graphite sheet 1 are encapsulated in the housing 2, wherein the electric core assembly 3 is an energy carrier of the power battery, as shown in fig. 2, and the electric core assembly 3 may include a plurality of electric cores 31. In the embodiment of the present invention, in order to leave sufficient space for the increase of the volume of the battery cell 31 after the discharge cycle, there is a gap between every two adjacent battery cells 31. Specifically, the electric cores 31 may be stacked in the vertical direction of the inner cavity of the casing 2, and the electric cores 31 may also be stacked in the horizontal direction of the inner cavity of the casing 2, so that each electric core 31 may reserve a sufficient space for the volume increase after the discharge cycle in each direction.

In addition, the first graphite sheet 1 may be an artificial graphite sheet, and particularly, the artificial graphite sheet may be a carbon molecule highly-crystallized graphite film, which is a soaking material for eliminating local hot spots, prepared by a synthetic method. The first graphite sheet 1 is made of a flexible material, and therefore can be processed into various shapes, has good bending properties, and can be disposed in close contact with the surface of the battery cell 31. It should be noted that the first graphite sheet 1 may be a highly oriented pyrolytic graphite film formed by graphitizing a specific polymer film, or a graphite film formed by rolling expanded graphite, and the polymer film may be any one of polysulfonamide, polyacrylonitrile, polyimide, polystyrene, polyaryletherketone, polyparastyrene, and an intermediate phase asphalt film, which is not limited in the embodiment of the present invention.

First graphite flake 1 has bend section 11, and bend section 11 inlays the dress in the clearance between electric core 31 for bend section 11 and two adjacent electric core 31's surface contact, and then can transmit the outside of electric core subassembly 3 through bend section 11 with the heat of the inside production of electric core subassembly 3. Further, under the relatively even condition of heat distribution that electric core subassembly 3 produced, bend section 11 can set up in the clearance between arbitrary two adjacent electric cores 31, under the uneven condition of heat distribution that electric core subassembly 3 produced, if the heat that is located two adjacent electric cores 31 of electric core subassembly 3 middle part position produced is more, consequently can inlay the section 11 of bending in the clearance between two adjacent electric cores 31 that are located electric core subassembly 3 middle part position. Or, in some application scenarios, if power battery's weight is unlimited, can all inlay in the clearance between every two adjacent electric cores 31 and install a section 11 of bending, the specific position of the section 11 of bending is confirmed with the manufacturing demand according to power battery's heat distribution, the embodiment of the utility model provides a do not limit to this.

It should be noted that, because the first graphite sheet 1 is made of a flexible material, the first graphite sheet 1 can be bent to form the bent segment 11, and the middle portion of the bent segment 11 has a buffer space. Specifically, the bending section 11 can be formed by bending two bending plates, one of the two bending plates is tightly attached to the heat dissipation surface of one of the two adjacent battery cells, the other of the two bending plates is tightly attached to the heat dissipation surface of the other of the two adjacent battery cells, and a buffer space is formed between the two bending plates at intervals. Like this, under the circumstances that the volume increases after electric core subassembly 3 discharge cycle, two adjacent electric cores 31 are constantly close to, and the buffering space that the section formed is bent in the extrusion forces the volume in buffering space to reduce along with the reduction in clearance between two adjacent electric cores.

In the embodiment of the present disclosure, since the power battery includes the first graphite sheet 1, the housing 2 and the plurality of cell assemblies 3, the cell assemblies 3 and the first graphite sheet 1 are packaged in the housing 2, each cell assembly 3 includes a plurality of cells 31, and a gap exists between every two adjacent cells 31, so that the gap between every two adjacent cells 31 can provide a space for volume expansion after the discharge cycle of the cell assembly 3. Because first graphite flake 1 has bend section 11 again, bend section 11 inlays the dress in the clearance between electric core 31, bend section 11 has the buffering space, consequently under the circumstances that the volume increases after electric core subassembly 3 discharge cycle, two adjacent electric cores are under the circumstances that constantly are close to promptly, the buffering space that the extrusion bend section formed, make the buffering space reduce along with the spaced reduction between two adjacent electric cores, like this, when giving electric core subassembly 3 quick heat dissipation through first graphite flake 1, also can provide expanded space after the electric core subassembly 3 discharge cycle, and then improve electric core subassembly 3's security.

Optionally, the first graphite sheet 1 further comprises a connecting segment 12; the connecting section 12 is tightly attached to the side surface of the electric core assembly 3, wherein the connecting section 12 is connected to two ends of the bending section 11.

It should be noted that the connecting section 12 is mainly used to conduct the heat conducted to the bent section 11 to the outside of the core assembly 3, and further increases the coverage area of the first graphite sheet 1. Because linkage segment 12 is connected at the both ends of the section of bending 11, and then can further reduce radiating route to the both sides transmission of the electric core subassembly 3 with the heat of conducting to the section of bending 11 for the rate of heat dissipation of first graphite flake 1.

Alternatively, as shown in fig. 3 to 5, the connecting section 12 includes a first connecting section 121 and a second connecting section 122; first linkage segment 121 connects the tip at second linkage segment 122, second linkage segment 122 is connected with the both ends of the section of bending 11, wherein, first side setting of electricity core subassembly 3 is hugged closely to first linkage segment 121, the second side setting of electricity core subassembly 3 is hugged closely to first linkage segment 121, wherein, first side and second side are two surfaces of electricity core subassembly 3 mutually perpendicular, the setting of buckling between first linkage segment 121 and the second linkage segment 122, the setting of buckling between second linkage segment 122 and the section of bending 11.

It should be noted that the whole electric core assembly 3 composed of a plurality of electric cores 31 may be a rectangular parallelepiped, so that the electric core assembly 3 has six heat dissipation surfaces, specifically, four side surfaces and two end surfaces, where the four side surfaces include two opposite first side surfaces and two opposite second side surfaces. The first connecting section 121 and the second connecting section 122 are arranged in a bending mode, a group of first connecting section 121 and a group of second connecting section 122 are arranged on two sides of the bending section 11, the first connecting section 121 and the second connecting section 122 can be symmetrically arranged relative to the bending section 11, and can also be asymmetrically arranged relative to the bending section 11, so that the first connecting section 121 is arranged on two first side faces in opposite positions in a clinging mode, the second connecting section 122 is arranged on a clinging mode, and the second side faces are located between the first side faces and the second side faces. In this way, the heat conducted to the bending section 11 can be transmitted to the first connection section 121 through the second connection section 122, and since the first connection section 121 is located at the outer side of the cell assembly 3, the heat can be transmitted to the outer side of the cell assembly 3 from the inner side of the cell assembly 3. It should be further noted that, because the first graphite sheet 1 is an artificial graphite film material, the material has a higher thermal conductivity along the plane direction, and the thermal conductivity can reach three to five times of that of copper, therefore, the bending setting is performed between the first connecting section 121 and the second connecting section 122, under the condition that the second connecting section 122 and the bending setting are performed between the bending sections, the length direction of the first connecting section 121 is parallel to the length direction of the bending section, and because the first connecting section 121 is tightly attached to the first side face, the bending section and the first connecting section 121 are both disposed along the plane direction of the electric core assembly 3, thereby facilitating the limited heat conducting space to rapidly conduct the heat of the electric core assembly 3. It should be noted that fig. 3 to 5 are schematic cross-sectional views of the electric core assembly 3 in fig. 2 along the direction a-a.

Optionally, as shown in fig. 1 and 3, the power battery further includes two second graphite sheets 4; the case 2 includes a battery upper case 21 and a battery lower case 22; the upper battery shell 21 and the lower battery shell 22 are detachably connected, the electric core component 3 is embedded in a cavity formed between the upper battery shell 21 and the lower battery shell 22, and a first gap 113 is formed between two end surfaces of the electric core component 3 and the inner wall of the lower battery shell 22; the second graphite sheet 4 is located in the first gap 113, and the two second graphite sheets 4 are respectively covered on two end faces of the electric core assembly 3, wherein the end faces are two faces of the electric core assembly 3 perpendicular to the surface and the side face of the electric core assembly 3.

It should be noted that, the second graphite sheet 4 can also be an artificial graphite membrane, and the embodiment of the present invention is not described herein again. Can dismantle the connection through modes such as joint between battery epitheca 21 and the battery inferior valve 22, and then make things convenient for maintenance and the change to inside electric core subassembly 3. After the electric core assembly 3 is embedded in the cavity formed between the battery upper shell 21 and the battery lower shell 22, a first gap 113 is formed between two end faces of the electric core assembly 3 and the inner wall of the battery lower shell 22, the first gap 113 can provide an expanded space for the electric core assembly 3 after discharge circulation, the electric core assembly 3 is prevented from contacting with the inner wall of the shell 2 after volume expansion due to discharge circulation, and the safety of the power battery is further improved.

Furthermore, as mentioned above, the whole of the electric core assembly 3 formed by the plurality of electric cores 31 may be a rectangular parallelepiped, so that the electric core assembly 3 has six heat dissipation surfaces, and specifically, may include four side surfaces and two end surfaces, and the two end surfaces are perpendicular to the side surfaces. Like this, after two second graphite flakes 4 branches cover on two terminal surfaces of electric core subassembly 3 for the side and the terminal surface of electric core subassembly 3 all have the graphite flake to conduct heat, and because second graphite flake 4 is in first clearance 113, first clearance 113 is the clearance between two terminal surfaces of electric core subassembly 3 and the inner wall of battery inferior valve 22, consequently can transmit the heat to the outside of casing 2 from the inside of casing 2 through second graphite flake 4, further improve power battery's radiating efficiency.

Optionally, as shown in fig. 4, a bending section 11 is embedded in a gap between the middle portions of every two adjacent battery cells 31.

In this kind of implementation, the temperature distribution of electric core subassembly 3 is comparatively even, and under the unrestricted condition of power battery's weight, can all inlay in the clearance between every two adjacent electric cores 31 and adorn a section of bending 11 for the middle part of every two adjacent electric cores 31 all has a section of bending to carry out the heat conduction, and then improves electric core subassembly 3's radiating efficiency.

Optionally, as shown in fig. 3, a bending section 11 is embedded in a gap between two adjacent battery cells 31 located in the middle of the battery cell assembly 3.

In this kind of implementation, the temperature at the middle part of electric core subassembly 3 is higher, and for furthest's reduction power battery's whole weight, consequently only inlay in the clearance of two adjacent electric cores 31 at electric core subassembly 3 middle part and adorn section 11 of bending for the higher position of electric core subassembly 3 middle part temperature has the section of bending to conduct heat, makes electric core subassembly 3 under the circumstances that the assurance whole weight is lighter, also can realize the heat dissipation of the higher position of middle part temperature.

Optionally, the bending section 11 includes a first bending section 111 and a second bending section 112; the first bending section 111 and the second bending section 112 are arranged at intervals, a buffer space is formed between the first bending section 111 and the second bending section 112, the first bending section 111 is tightly attached to one heat dissipation surface of two adjacent battery cells 31, the second bending section 112 is tightly attached to one heat dissipation surface of two adjacent battery cells 31, and the heat dissipation surfaces of the two adjacent battery cells 31 are arranged oppositely.

Specifically, the one end and the connecting segment 12 of first bending section 111 are buckled and are set up, the other end of first bending section 111 and the one end of second bending section 112 are buckled and are set up, and the other end and the connecting segment 12 of second bending section 112 are buckled and are set up for first bending section 111 and the interval setting of second bending section 112 are bent, and the buckling parts of first bending section 111 and second bending section 112 form buffer space. Like this, under the circumstances that the volume increases behind the electric core subassembly 3 discharge cycle, two adjacent electric cores 31 are constantly close to for be close to each other between first section 111 and the second section 112 of bending, and then extrude the buffer space that forms between first section 111 and the second section 112 of bending, force the volume in buffer space and reduce along with the reducing in clearance between two adjacent electric cores 31, and then make the section 11 of bending also can provide the space that the volume increases for electric core subassembly 3 discharge cycle in the radiating.

Optionally, the gaps between the battery cells 31 include a second gap 311 and a third gap 312; the second gap 311 is a gap between two adjacent battery cells 31 in the first direction of the battery cell assembly 3, and the third gap 312 is a gap between two adjacent battery cells 31 in the second direction of the battery cell assembly 3, where the first direction is the length direction of the battery cell assembly 3, and the second direction is the direction perpendicular to the first direction.

Specifically, the battery cells 31 may be stacked in a first direction, and stacked in a second direction, so that a second gap 311 exists between two adjacent battery cells 31 in the first direction of the battery core assembly 3, and a second gap 311 exists between two adjacent battery cells 31 in the second direction of the battery core assembly 3, because the first direction and the second direction are two directions perpendicular to each other, there is sufficient space in both the first direction and the second direction when the discharge circulation volume of the battery core assembly 3 is increased, and the safety performance of the power battery is further enhanced.

Optionally, the bent segment 11 is embedded in the first gap 113, or the bent segment 11 is embedded in the second gap 311, or both the first gap 113 and the second gap 311 are embedded with the bent segment 11.

It should be noted that, in a possible implementation manner, as shown in fig. 3 and fig. 4, the bending section 11 may be embedded between two adjacent battery cells 31 in the first direction of the battery cell assembly 3, so that the bending section 11 is disposed along the length direction of the second gap 311. In another possible implementation manner, as shown in fig. 6, the bending section 11 may be embedded between two adjacent battery cells 31 in the second direction of the battery cell assembly 3, so that a third gap 312 exists, and the bending section 11 is disposed along the length direction of the third gap 312. Or, as shown in fig. 5, under the situation that the weight of first graphite sheet 1 processing technology and power battery is not limited, can all inlay the dress section of bending 11 in second clearance 311 and third clearance 312, it is thus clear that the embodiment of the utility model provides a first graphite sheet 1 can rationally dispose according to the electric core subassembly 3 of different specifications, and then makes the utility model provides a power battery's application scene is not limited.

Optionally, the electric core assembly 3 further comprises a tab plate 5, and the tab plate 5 is electrically connected with the electric core assembly 3.

It should be noted that the tab plate 5 is a metal conductor for leading out the positive electrode and the negative electrode in the battery assembly 3, and in the case that the battery assembly 3 and the tab plate 5 are electrically connected, the tab plate 5 can serve as a contact point when the battery assembly 3 is charged and discharged.

In the embodiment of the present disclosure, since the power battery includes the first graphite sheet 1, the housing 2 and the plurality of cell assemblies 3, the cell assemblies 3 and the first graphite sheet 1 are packaged in the housing 2, each cell assembly 3 includes a plurality of cells 31, and a gap exists between every two adjacent cells 31, so that the gap between every two adjacent cells 31 can provide a space for volume expansion after the discharge cycle of the cell assembly 3. Because first graphite flake 1 has bend section 11 again, bend section 11 inlays the dress in the clearance between electric core 31, bend section 11 has the buffering space, consequently under the circumstances that the volume increases after electric core subassembly 3 discharge cycle, two adjacent electric cores are under the circumstances that constantly are close to promptly, the buffering space that the extrusion bend section formed, make the buffering space reduce along with the spaced reduction between two adjacent electric cores 31, like this, when giving electric core subassembly 3 quick heat dissipation through first graphite flake 1, also can provide the expanded space for electric core subassembly 3 discharge cycle back, and then improve electric core subassembly 3's security.

Besides, the power battery further comprises two second graphite sheets 4, after the two second graphite sheets 4 are respectively covered on the two end faces of the electric core assembly 3, the side faces and the end faces of the electric core assembly 3 are both provided with graphite sheets for heat transfer, and because the second graphite sheets 4 are located in the first gap 113, the first gap 113 is a gap between the two end faces of the electric core assembly 3 and the inner wall of the battery lower case 22, so that heat can be transferred from the inside of the case 2 to the outside of the case 2 through the second graphite sheets 4, and the heat dissipation efficiency of the power battery is further improved.

In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the disclosure may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the disclosure, various features of the disclosure are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various disclosed aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that is, the claimed disclosure requires more features than are expressly recited in each claim. Rather, as the following claims reflect, disclosed aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this disclosure.

Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.

Various component embodiments of the present disclosure may be implemented in hardware. Those skilled in the art will appreciate that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functions of some or all of the components in a power cell according to the present disclosure.

It should be noted that the above-mentioned embodiments illustrate rather than limit the disclosure, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The disclosure may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.

The above description is only exemplary of the present disclosure and should not be taken as limiting the disclosure, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.

The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present disclosure, and all the changes or substitutions should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A power cell comprising a first graphite sheet, a housing, and a plurality of cell assemblies;

2. The power cell of claim 1, wherein the first graphite sheet further comprises a connecting segment;

3. The power cell of claim 2, wherein the connection segment comprises a first connection segment and a second connection segment;

4. The power cell of claim 2, further comprising two second graphite sheets; the shell comprises a battery upper shell and a battery lower shell;

5. The power battery of claim 1, wherein a bending section is embedded in a gap between the middle portions of every two adjacent battery cells.

6. The power battery of claim 1, wherein a bending section is embedded in a gap between two adjacent cells in the middle of the cell assembly.

7. The power battery of claim 1, wherein the bending sections comprise a first bending section and a second bending section;

8. The power battery of claim 1, wherein the gaps between the cells comprise a second gap and a third gap;

9. The power battery according to claim 8, wherein the bent section is embedded in the second gap, or the bent section is embedded in the third gap, or both the second gap and the third gap are embedded with the bent section.

10. The power cell of claim 1, wherein the cell assembly further comprises pole ear plates, the pole ear plates and the cell assembly being electrically connected.