Single battery, battery pack and electric equipment

Abstract

The utility model discloses a single battery, a battery pack and electric equipment, and belongs to the technical field of batteries, the single battery is internally provided with a heat conduction part, so that heat on the inner sides of adjacent bare battery cells can be transferred to a second heat conduction part through a first heat conduction part of the heat conduction part, and the heat is effectively dissipated out of a shell through the second heat conduction part; therefore, the temperature consistency of different positions of the battery cell group is promoted, the capacity of transferring heat inside the single battery to the outside of the shell for heat dissipation is improved, and the overall electrical property of the single battery is improved; the filling part is arranged in at least one of the first heat conduction part and the second heat conduction part, so that the heat of the battery cell group can be absorbed through phase change of the filling part, and the heat dissipation efficiency of the battery cell group is improved; the second heat conduction parts wrap the plurality of outer surfaces of the battery cell group and are connected with the shell in an insulating manner, so that the insulating property between the battery cell group and the shell can be effectively guaranteed, and the safety of the single battery is guaranteed.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to a single cell, a battery pack and an electrical device. Background Art

[0002] Uneven temperature inside the battery will affect the performance consistency of the battery during use, and will lead to intensified side reactions of internal battery materials and excessive consumption of active materials, thus shortening the battery's service life and deteriorating its performance. Utility Model Content

[0003] Purpose of the utility model: The embodiment of the present application provides a single cell battery, aiming to solve the current technical problem of uneven temperature inside the battery; another purpose of the embodiment of the present application is to provide a battery pack; the third purpose of the embodiment of the present application is to provide an electrical device.

[0004] Technical solution: A single cell battery according to an embodiment of the present application includes:

[0005] A shell having an inner cavity and an opening communicating with the inner cavity;

[0006] A cover body, connected to the shell and covering the opening;

[0007] A battery cell group is disposed in the inner cavity, and the battery cell group includes a plurality of bare battery cells arranged along a first direction;

[0008] A heat-conducting member is arranged in the inner cavity, the heat-conducting member comprises a filling portion, a first heat-conducting portion and a second heat-conducting portion connected to the first heat-conducting portion, the first heat-conducting portion is arranged between two adjacent bare cells, the second heat-conducting portion is coated on multiple outer surfaces of the cell group arranged toward the shell, and is insulated and connected to the shell;

[0009] At least one of the first heat conducting part and the second heat conducting part is provided with a containing space, the filling part is filled in the containing space, and the filling part is configured to be able to undergo phase change and absorb heat.

[0010] In some embodiments, at least one of the first heat conducting portion and the second heat conducting portion is provided with a plurality of the accommodating spaces, and the heat conducting member includes a plurality of the filling portions, each of the filling portions filling one of the accommodating spaces.

[0011] In some embodiments, the first heat conducting portion is provided with the accommodating space and is filled with the filling portion;

[0012] The first direction is the thickness direction of the single battery. Along a direction perpendicular to the first direction, from the geometric center of the first heat-conducting portion to the edge of the first heat-conducting portion, the first heat-conducting portion satisfies at least one of the following conditions:

[0013] i) the number of the accommodation spaces provided within a unit volume is reduced;

[0014] ii) the total volume of the accommodation space provided within the unit volume is reduced;

[0015] iii) The total volume of the filling part provided within a unit volume is reduced.

[0016] In some embodiments, the first heat conducting portion is provided with the accommodating space and is filled with the filling portion, and the accommodating space penetrates the first heat conducting portion along the first direction; and / or,

[0017] The second heat-conducting part includes a plurality of connected heat-conducting plates, each of which is coated on one of the outer surfaces and is insulated and connected to the shell; at least one of the heat-conducting plates is provided with the accommodating space and is filled with the filling part, and the accommodating space penetrates the heat-conducting plate along the thickness direction of the heat-conducting plate.

[0018] In some embodiments, the heat conducting member further comprises:

[0019] A first insulating layer, wherein the first insulating layer covers the first heat conducting portion, and the first heat conducting portion is insulated and connected to the bare battery core through the first insulating layer.

[0020] In some embodiments, the second heat-conducting portion includes a plurality of connected heat-conducting sheets, each of which is coated on one of the outer surfaces;

[0021] The heat conducting member further comprises:

[0022] A second insulating layer, wherein the second insulating layer covers at least one of the heat conducting sheets, and the heat conducting sheet is insulated and connected to the housing through the second insulating layer.

[0023] In some embodiments, the heat conducting member includes a plurality of the first heat conducting parts, the plurality of the first heat conducting parts are arranged along the first direction, and at least one of the bare cells is disposed between two adjacent first heat conducting parts.

[0024] In some embodiments, the first heat conducting portion is provided with the accommodation space, and the contour shape of the accommodation space in the cross section of the first heat conducting portion perpendicular to the first direction is at least one of a circle, an ellipse, a semicircle, a polygon, and an irregular shape; and / or,

[0025] The second heat-conducting portion includes a plurality of connected heat-conducting sheets, each of which is coated on one of the outer surfaces and is insulated and connected to the shell; at least one of the heat-conducting sheets is provided with the accommodating space, and the contour shape of the accommodating space in the cross-section of the heat-conducting sheet perpendicular to its thickness direction is at least one of a circular, elliptical, semicircular, polygonal, and irregular shape.

[0026] In some embodiments, the first heat conducting portion and the second heat conducting portion are an integrated structure.

[0027] Correspondingly, a battery pack described in an embodiment of the present application includes the single cell described above.

[0028] Correspondingly, an electrical device described in an embodiment of the present application includes a single cell as described above, or includes a battery pack as described above.

[0029] Beneficial effects: The single cell battery of the embodiment of the present application includes: a shell, which is provided with an inner cavity and an opening connected to the inner cavity; a cover body, which is connected to the shell and covers the opening; a battery cell group, which is arranged in the inner cavity, and the battery cell group includes a plurality of bare battery cells arranged along a first direction; a heat conductive member, which is arranged in the inner cavity, and the heat conductive member includes a filling part, a first heat conductive member and a second heat conductive member connected to the first heat conductive member, the first heat conductive member is arranged between two adjacent bare battery cells, and the second heat conductive member is coated on a plurality of outer surfaces of the battery cell group arranged toward the shell, and is insulated and connected to the shell; at least one of the first heat conductive member and the second heat conductive member is provided with a accommodating space, the filling part fills the accommodating space, and the filling part is configured to be able to phase change and absorb heat. In the embodiment of the present application, by providing a heat conductive member, the heat inside the adjacent bare battery cells can be transferred to the second heat conductive member through the first heat conductive member, and the heat can be effectively dissipated to the outside of the shell through the second heat conductive member, thereby promoting the temperature consistency of different positions of the battery cell group, improving the ability of the single cell battery to transfer and dissipate the internal heat to the outside of the shell, and improving the overall electrical performance of the single cell battery; by providing a filling portion in at least one of the first heat conductive member and the second heat conductive member, the filling portion can be used to absorb the heat of the battery cell group by phase change, thereby improving the heat dissipation efficiency of the battery cell group; by covering multiple outer surfaces of the battery cell group with the second heat conductive member and insulating and connecting the shell, the insulation performance between the battery cell group and the shell can be effectively guaranteed, and the safety of the single cell battery can be guaranteed.

[0030] The battery pack of the embodiment of the present application includes the above-mentioned single battery, and thus can have all the technical features and technical effects of the above-mentioned single battery, which will not be repeated here.

[0031] The electrical equipment of the embodiment of the present application includes the above-mentioned single cell or the above-mentioned battery pack, and thus can have all the technical features and technical effects of the above-mentioned single cell or battery pack, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 A schematic diagram of the three-dimensional structure of a single cell provided in an embodiment of the present application;

[0034] Figure 2 A schematic cross-sectional view of a single cell in some embodiments of the present application;

[0035] Figure 3 This is a schematic diagram of the three-dimensional structure of the heat conducting member in some embodiments of the present application;

[0036] Figure 4 This is a schematic structural diagram of the heat conducting member in the first embodiment of the present application cut along a plane perpendicular to the first direction;

[0037] Figure 5 This is a schematic structural diagram of the heat conducting member in the first embodiment of the present application cut along a plane parallel to the first direction;

[0038] Figure 6 This is a perspective structural diagram of a heat conducting member in the second embodiment of the present application;

[0039] Figure 7 This is a perspective structural schematic diagram of a heat conducting member in the second embodiment of the present application cut along a plane parallel to the first direction;

[0040] Figure 8 This is a perspective structural schematic diagram of a heat conducting member in the second embodiment of the present application cut along a plane perpendicular to the first direction;

[0041] Fig. 9 It is a perspective structural schematic diagram of a heat conducting member in the third embodiment of the present application cut along a plane perpendicular to the first direction;

[0042] Fig.10 This is a schematic structural diagram of a heat conducting member in a fourth embodiment of the present application observed along a first direction;

[0043] Fig.11 This is a perspective structural schematic diagram of a heat conducting member in a fifth embodiment of the present application cut along a plane parallel to the first direction;

[0044] Fig.12 This is a perspective structural diagram of a heat conducting member in a sixth embodiment of the present application;

[0045] Fig.13It is a perspective structural schematic diagram of a heat conducting member in a sixth embodiment of the present application cut along a plane parallel to the first direction;

[0046] Fig.14 This is a schematic diagram of the front view of the heat conducting member in the sixth embodiment of the present application cut along a plane perpendicular to the first direction;

[0047] Fig.15 This is a schematic diagram of the front view of the heat conducting member in the sixth embodiment of the present application cut along a plane parallel to the first direction;

[0048] Fig.16 This is a schematic diagram of the three-dimensional structure of the heat conducting member in the seventh embodiment of the present application;

[0049] Fig.17 This is a schematic diagram of the three-dimensional structure of the heat conducting member in the seventh embodiment of the present application cut along a plane parallel to the first direction;

[0050] Fig.18 This is a schematic structural diagram of a heat conducting member in a seventh embodiment of the present application observed along a first direction;

[0051] Fig.19 To observe from another angle Fig.17 A schematic diagram of a partially enlarged structure of the middle structure;

[0052] Fig. 20 This is a schematic cross-sectional view of a single cell in the eighth embodiment of the present application;

[0053] Figure numerals: 10 - single cell; 100 - shell; 110 - inner cavity; 120 - opening; 200 - cover; 300 - battery cell group; 310 - bare battery cell; 400 - heat conductive part; 410 - first heat conductive part; 420 - second heat conductive part; 421 - heat conductive sheet; 430 - filling part; 440 - accommodating space; 450 - first insulating layer; 460 - second insulating layer. DETAILED DESCRIPTION

[0054] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0055] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, "multiple" means two or more, and at least one means one, two or more, unless otherwise clearly and specifically defined.

[0056] It should also be noted that in the drawings of the embodiments of the present application, the arrow marked with X indicates the first direction X. The first direction X is introduced in the description of the present application in order to more clearly describe the structure and relative position relationship of the components in the single cell. In practical applications, the first direction X can point to any direction in space. In the single cell, the first direction X can correspond to the thickness direction of the single cell. For a single cell with a square structure, the thickness direction can be the direction in which the two large faces (i.e., the side with the largest area) are arranged, i.e., the two large faces are arranged along the first direction X and are away from each other.

[0057] In the related art, a single cell contains a bare cell obtained by alternately winding or stacking positive and negative electrode sheets, also known as an electrode assembly or winding core. To avoid short circuits, the positive active material and the negative active material inside the single cell are generally separated by an insulating diaphragm, which is generally a PE or PP material. In order to ensure the ion transmission and electron transmission pathways during the charging and discharging process of the single cell, the bare cell is generally compacted tightly so that the positive and negative electrode sheets are tightly stacked, and an ion-conducting and electronically insulating electrolyte material is injected at the same time. During the use of the single cell, the tightly stacked active materials cause the heat generated by the electrochemical reaction and chemical reaction to accumulate continuously inside the single cell. The heat is mainly dissipated by the conduction between the positive and negative poles and the battery shell. This method is difficult to achieve uniform heat dissipation at different positions, and the heat dissipation efficiency is low, resulting in poor temperature consistency inside the single cell. The temperature continues to rise during use, thus affecting the service life and electrical performance. In addition, the electrochemical reaction of the single battery generates heat during use, and the heat cannot be dissipated in time inside the single battery, causing the internal temperature to rise. The temperature of the connection between the bare battery cell and the shell dissipates faster, resulting in inconsistent internal temperature of the battery. These will lead to intensified side reactions of the internal materials of the battery, excessive consumption of active materials, and deterioration of battery performance. The degree of side reactions in different locations inside the battery is different, and the degree of performance deterioration is different.

[0058] In view of this, an embodiment of the present application provides a single cell battery, aiming to overcome at least one of the above-mentioned technical problems.

[0059] Please also read Figures 1 to 20 The single cell battery 10 of the embodiment of the present application includes a shell 100, a cover 200, a battery cell group 300 and a heat conductive member 400. The shell 100 is provided with an inner cavity 110 and an opening 120 connected to the inner cavity 110. The cover 200 is connected to the shell 100 and covers the opening 120. The battery cell group 300 is arranged in the inner cavity 110, and includes a plurality of bare battery cells 310 arranged along a first direction X. The heat conductive member 400 is arranged in the inner cavity 110, and the heat conductive member 400 includes a filling portion 430, a first heat conductive portion 410 and a second heat conductive portion 420 connected to the first heat conductive portion 410. The first heat conductive portion 410 is arranged between two adjacent bare battery cells 310, and the second heat conductive portion 420 is coated on multiple outer surfaces of the battery cell group 300 arranged toward the shell 100, and is insulated and connected to the shell 100. At least one of the first heat conducting part 410 and the second heat conducting part 420 is provided with a receiving space 440 , and the filling part 430 is filled in the receiving space 440 . The filling part 430 is configured to be able to undergo phase change and absorb heat.

[0060] In the single cell 10 of the embodiment of the present application, by setting its heat conducting member 400 as the above-mentioned structure, it is possible to transfer the heat inside the adjacent bare cells 310 to the second heat conducting portion 420 through the first heat conducting portion 410, and effectively dissipate the heat to the outside of the shell 100 through the second heat conducting portion 420, thereby promoting the temperature consistency of different positions of the cell group 300, improving the ability of the single cell 10 to transfer and dissipate the internal heat to the outside of the shell 100, and improving the overall electrical performance of the single cell 10; by setting a filling portion 430 in at least one of the first heat conducting portion 410 and the second heat conducting portion 420, the filling portion 430 can be used to absorb the heat of the cell group 300 by phase change, thereby improving the heat dissipation efficiency of the cell group 300; by covering the second heat conducting portion 420 on multiple outer surfaces of the cell group 300 and insulating and connecting the shell 100, it is possible to effectively ensure the insulation performance between the cell group 300 and the shell 100, and ensure the safety of the single cell 10.

[0061] The shell 100 and the cover 200 are the main external structures of the single battery 10. The closed structure formed by the connection between the two can be used to accommodate the internal structure of the single battery 10 to protect the internal structure from physical collision, extrusion or damage. In addition, the shell 100 and the cover 200 can also stabilize the internal structure of the single battery 10, thereby preventing deformation or movement of internal components during use, ensuring the normal operation and life of the single battery 10.

[0062] In some embodiments, the housing 100 and / or the cover 200 are provided with pole holes, and the poles are inserted into the corresponding pole holes to keep the positions of the poles stable, and the positive and negative poles are effectively isolated to prevent short circuits and current leakage. Optionally, the pole holes can be provided on the cover 200, and the poles can be installed in the pole holes to be connected to the cover 200. Optionally, the pole holes can also be provided on the housing 100, and the poles can be installed in the pole holes to be connected to the housing 100.

[0063] In some embodiments, the housing 100 is provided with at least one opening 120, that is, the number of the openings 120 may be one or more. Accordingly, the number of the covers 200 is consistent with the number of the openings 120, and each cover 200 is correspondingly provided at one opening 120. Optionally, the housing 100 may be provided with two openings 120, and the two openings 120 are respectively provided at opposite ends of the housing 100 and are respectively covered by a cover 200.

[0064] The battery cell group 300 is a combination structure of multiple bare battery cells 310, which can also be called electrode assemblies, winding cores, etc. The bare battery cells 310 are a structure with charge and discharge performance formed by alternately winding or stacking positive electrode sheets, negative electrode sheets and isolation films. The bare battery cells 310 can be connected to the poles through their pole ears to achieve circuit connectivity inside the single battery 10.

[0065] The heat conductor 400 is used to conduct the heat generated by each bare cell 310 in the cell group 300 to the shell 100, and is also used to be spaced between the cell group 300 and the shell 100 to ensure insulation performance. The preparation material of the heat conductor 400 may include insulating and heat-conductive materials, such as silicone, insulating polymer carbon fiber film and other insulating and heat-conductive flexible materials. Optionally, the thickness may be 0.005mm to 10mm. The filling portion 430 of the heat conductor 400 is capable of producing phase change and absorbing heat, and it may contain phase change material, so that it can spontaneously absorb heat through phase change. During the use of the single battery 10, when the temperature of the bare cell 310 rises to the conversion temperature of the phase change material in the conductive filling portion 430, the phase change material can undergo a phase change and absorb the heat of the bare cell 310 at the same time.

[0066] In some embodiments, at least one of the first heat conducting part 410 and the second heat conducting part 420 is provided with a plurality of accommodating spaces 440, and the heat conducting member 400 includes a plurality of filling parts 430, each of which is filled in one accommodating space 440. Figure 4 , Figure 5 , Figure 12 to Figure 14In the first embodiment and the sixth embodiment, the first heat conducting part 410 is provided with a plurality of accommodating spaces 440, and the plurality of accommodating spaces 440 can be distributed at different positions on the first heat conducting part 410, and each accommodating space 440 is filled with a filling part 430, so that the filling part 430 can be dispersedly arranged in the first heat conducting part 410, and can absorb the heat at different positions inside two adjacent bare cells 310 respectively, which is conducive to promoting the temperature consistency at different positions of the bare cells 310, and utilizing the phase change heat absorption characteristics of the plurality of filling parts 430 to improve the heat absorption capacity, so that the operation of the single cell 10 is more stable. Optionally, please combine Figures 16 to 18 In the seventh embodiment, the second heat conducting part 420 is provided with a plurality of accommodating spaces 440, and the plurality of accommodating spaces 440 can be distributed at different positions of the second heat conducting part 420, and each accommodating space 440 is filled with a filling part 430, so that the filling part 430 can be dispersedly arranged in the second heat conducting part 420, and can absorb the heat at different positions of the outer surface of the battery cell group 300 respectively, which is conducive to promoting the temperature consistency of different positions of the battery cell group 300, and utilizing the phase change heat absorption characteristics of the plurality of filling parts 430 to improve the heat absorption capacity, so that the operation of the single battery 10 is more stable. It should also be noted that, although not shown in the figure, a plurality of accommodating spaces 440 can be arranged on both the first heat conducting part 410 and the second heat conducting part 420; or a plurality of accommodating spaces 440 can be arranged on one of them, and a single accommodating space 440 can be arranged on the other; accordingly, each accommodating space 440 of the first heat conducting part 410 and the second heat conducting part 420 is filled with a filling part 430.

[0067] In some embodiments, the first heat conducting part 410 is provided with a receiving space 440 and is filled with a filling part 430. The first direction X is the thickness direction of the single cell 10, that is, the first heat conducting part 410 corresponds to the large surface of the single cell 10, and the first heat conducting part 410 is opposite to the surface with the largest area of ​​the bare cell 310. Along the direction perpendicular to the first direction X, from the geometric center of the first heat conducting part 410 to the edge of the first heat conducting part 410, the first heat conducting part 410 satisfies at least one of the following conditions: i) the number of receiving spaces 440 set in a unit volume is reduced; ii) the total volume of the receiving spaces 440 set in a unit volume is reduced; iii) the total volume of the filling part 430 set in a unit volume is reduced. In other words, from the center of the first heat conducting part 410 to the edge, the phase change material set is gradually reduced, so that the phase change material with more in the middle can absorb more heat in the middle of the large surface, and the phase change material with less at the edge absorbs relatively less heat, so that the heat of the entire large surface is more uniform, and the temperature consistency of each position of the single cell 10 is improved.

[0068] Optionally, please combine Figure 4 , Figure 5 , Figure 12 to Figure 14In the first embodiment and the sixth embodiment, a plurality of circular and elliptical accommodating spaces 440 are respectively provided on the first heat conducting part 410, and the accommodating space 440 near the geometric center is larger, and the accommodating space 440 near the edge is relatively smaller, thereby satisfying the above condition ii. A larger accommodating space 440 can fill a larger filling part 430, and the filling part 430 near the geometric center has a larger volume, and the filling part 430 near the edge has a smaller volume, thereby satisfying the above condition iii.

[0069] Optionally, please combine Figure 6 , Figure 7 and Fig.11 In the second embodiment and the fifth embodiment, the first heat conducting part 410 may be provided with only one accommodating space 440. Along the first direction X, the width of the accommodating space 440 near the geometric center of the first heat conducting part 410 intersects with a larger width near the edge of the first heat conducting part 410. Then, the volume of the accommodating space 440 near the geometric center is larger, satisfying the above condition ii.

[0070] Optionally, more accommodating spaces 440 may be provided in the area near the geometric center of the first heat conducting part 410, and fewer accommodating spaces 440 may be provided in the area near the edge. This may also achieve a gradual reduction in the phase change material provided from the center to the edge of the first heat conducting part 410, thereby improving the temperature consistency at various positions of the single battery 10.

[0071] Specifically, the first heat conducting part 410 can be divided into a plurality of blocks of equal volume from its geometric center to the edge, for example, 5 to 10 blocks of equal volume, and the volume of each block is taken as the unit volume to measure the number and total volume of the accommodation spaces 440 and the total volume of the filling part 430. It should be noted that in the above conditions, when a certain area is closer to the edge than another area, it is not strictly required that the number of accommodation spaces 440, the total volume of the accommodation spaces 440, and the total volume of the filling part 430 in the area closer to the edge are less or less than those in the other area, and it is only necessary that the change trend from the geometric center to the edge roughly shows a decreasing or decreasing trend.

[0072] Please combine again Figure 4 , Figure 5 , Figure 12 to Figure 14 In the first embodiment and the sixth embodiment, the first heat conducting part 410 is provided with a receiving space 440 and filled with a filling part 430, and the receiving space 440 penetrates the first heat conducting part 410 along the first direction X. That is, the receiving space 440 of the first heat conducting part 410 can be a penetrating receiving hole, so that the filling part 430 can contact with two adjacent bare cells 310, thereby improving the heat absorption effect.

[0073] Please combine 16 to Fig.18In the seventh embodiment, the second heat conducting part 420 includes a plurality of connected heat conducting sheets 421, each heat conducting sheet 421 is coated on an outer surface of the battery cell group 300, and is insulated and connected to the housing 100. Among them, at least one heat conducting sheet 421 is provided with a receiving space 440 and is filled with a filling portion 430, and the receiving space 440 penetrates the heat conducting sheet 421 along the thickness direction of the heat conducting sheet 421. That is to say, among the plurality of heat conducting sheets 421 of the second heat conducting part 420, one or more heat conducting sheets 421 are provided with a receiving space 440, and the receiving space 440 of each heat conducting sheet 421 can be a receiving hole penetrating the heat conducting sheet 421 along the thickness direction thereof, so that the filling portion 430 can contact with the battery cell group 300, thereby improving the heat absorption effect.

[0074] See also Fig.19 In the seventh embodiment, the heat conducting member 400 further includes a first insulating layer 450, the first insulating layer 450 is coated on the first heat conducting part 410, and the first heat conducting part 410 is insulated and connected to the bare battery cell 310 through the first insulating layer 450. By coating the first insulating layer 450 on the first heat conducting part 410, the insulation performance can be improved and the overall safety of the single cell 10 can be guaranteed. Among them, the first heat conducting part 410 can be a copper foil, aluminum foil, graphite film, or stainless steel with thermal conductivity. The first insulating layer 450 can be a PI film, a PET film, a PP film, a PC film, a PVC film, a PU film, etc. Optionally, the thickness of the first insulating layer 450 can be 0.005mm to 5mm, the thickness of the first heat conducting part 410 can be 0.005mm to 5mm, and the sum of the thicknesses of the two can be 0.01mm to 10mm.

[0075] See also Fig.15 In the sixth embodiment, the second heat conducting part 420 includes a plurality of connected heat conducting sheets 421, each heat conducting sheet 421 is coated on an outer surface; the heat conducting member 400 also includes a second insulating layer 460, the second insulating layer 460 is coated on at least one heat conducting sheet 421, and the heat conducting sheet 421 is insulated and connected to the housing 100 through the second insulating layer 460. By coating the heat conducting sheet 421 with the second insulating layer 460, the insulation performance can be improved and the overall safety of the single battery 10 can be guaranteed. Among them, the second heat conducting part 420 can be a copper foil, aluminum foil, graphite film, or stainless steel with heat conductivity. The second insulating layer 460 can be a PI film, a PET film, a PP film, a PC film, a PVC film, a PU film, etc. Optionally, the thickness of the second insulating layer 460 can be 0.005mm to 5mm, the thickness of the heat conducting sheet 421 can be 0.005mm to 5mm, and the sum of the thicknesses of the two can be 0.01mm to 10mm.

[0076] Please refer again Fig.19In the seventh embodiment, the first heat conducting part 410 is coated with a first insulating layer 450, and at least one heat conducting sheet 421 of the second heat conducting part 420 is coated with a second insulating layer 460, thereby improving the insulation effects of the first heat conducting part 410 and the second heat conducting part 420 at the same time.

[0077] See also Fig. 20 In the eighth embodiment, the heat conducting member 400 includes a plurality of first heat conducting portions 410 , the plurality of first heat conducting portions 410 are arranged along the first direction X, and at least one bare battery cell 310 is disposed between two adjacent first heat conducting portions 410 .

[0078] In some embodiments, the first heat-conducting part 410 is provided with a receiving space 440, and the contour shape of the receiving space 440 in the cross section of the first heat-conducting part 410 perpendicular to the first direction X is at least one of a circle, an ellipse, a semicircle, a polygon, and an irregular shape; and / or, the second heat-conducting part 420 includes a plurality of connected heat-conducting sheets 421, each heat-conducting sheet 421 is coated on an outer surface and is insulated from the shell 100; at least one heat-conducting sheet 421 is provided with a receiving space 440, and the contour shape of the receiving space 440 in the cross section of the heat-conducting sheet 421 perpendicular to its thickness direction is at least one of a circle, an ellipse, a semicircle, a polygon, and an irregular shape. Optionally, please refer to Figures 4 to 8 In the first and second embodiments, the contour shape of the accommodation space 440 is circular. Fig. 9 In the third embodiment, the outline shape of one accommodating space 440 is circular, and the outline shape of the other accommodating space 440 is polygonal. Fig.10 , Figure 12 to Figure 14 In the fourth and sixth embodiments, the contour shape of the accommodation space 440 is an ellipse. Fig.11 , Figures 16 to 18 In the fifth and seventh embodiments, the contour shape of the accommodating space 440 is a polygon. Specifically, in the fifth embodiment, the contour shape of the accommodating space 440 is a rectangle, and in the seventh embodiment, the contour shape of the accommodating space 440 is a rhombus.

[0079] It should be noted that the above-mentioned contour shape of the accommodating space 440 can be a standard geometric shape, or other regular or irregular shapes, and can be specifically set according to the heat generation conditions of each position of the battery cell group 300.

[0080] In some embodiments, the first heat conducting part 410 and the second heat conducting part 420 are an integrated structure and can be formed by integrated processing, which is convenient for manufacturing, reduces processing steps, and improves production efficiency.

[0081] Correspondingly, an embodiment of the present application further provides a battery pack, which may include a single cell described in any of the above embodiments, so that the battery pack may have all the technical features and technical effects of the above single cells, which will not be repeated here.

[0082] Correspondingly, an embodiment of the present application also provides an electrical device, which may be an electrical energy-driven device such as a new energy vehicle, a laptop computer, etc., which may include the above-mentioned single cell battery, or include the above-mentioned battery pack, which will not be repeated here.

[0083] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0084] The single cells, battery packs and electrical equipment provided in the embodiments of the present application are introduced in detail above, and the principles and implementation methods of the present application are explained by using specific examples. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A single cell battery, characterized in that: include: A shell having an inner cavity and an opening communicating with the inner cavity; A cover body, connected to the shell and covering the opening; A battery cell group is disposed in the inner cavity, and the battery cell group includes a plurality of bare battery cells arranged along a first direction; A heat-conducting member is arranged in the inner cavity, the heat-conducting member comprises a filling portion, a first heat-conducting portion and a second heat-conducting portion connected to the first heat-conducting portion, the first heat-conducting portion is arranged between two adjacent bare cells, the second heat-conducting portion is coated on multiple outer surfaces of the cell group arranged toward the shell, and is insulated and connected to the shell; At least one of the first heat conducting part and the second heat conducting part is provided with a containing space, the filling part is filled in the containing space, and the filling part is configured to be able to undergo phase change and absorb heat.

2. The single cell according to claim 1, characterized in that: At least one of the first heat conducting portion and the second heat conducting portion is provided with a plurality of the accommodating spaces, and the heat conducting member includes a plurality of the filling portions, each of the filling portions being filled in one of the accommodating spaces.

3. The single cell according to claim 1, characterized in that: The first heat conducting part is provided with the accommodating space and is filled with the filling part; The first direction is the thickness direction of the single battery. Along a direction perpendicular to the first direction, from the geometric center of the first heat-conducting portion to the edge of the first heat-conducting portion, the first heat-conducting portion satisfies at least one of the following conditions: i) the number of the accommodation spaces provided within a unit volume is reduced; ii) the total volume of the accommodation space provided within the unit volume is reduced; iii) The total volume of the filling part provided within a unit volume is reduced.

4. The single cell according to claim 1, characterized in that: The first heat-conducting portion is provided with the accommodating space and is filled with the filling portion, and the accommodating space penetrates the first heat-conducting portion along a first direction; and / or, The second heat-conducting part includes a plurality of connected heat-conducting plates, each of which is coated on one of the outer surfaces and is insulated and connected to the shell; at least one of the heat-conducting plates is provided with the accommodating space and is filled with the filling part, and the accommodating space penetrates the heat-conducting plate along the thickness direction of the heat-conducting plate.

5. The single cell according to claim 1, characterized in that: The heat conducting member further comprises: A first insulating layer, wherein the first insulating layer covers the first heat conducting portion, and the first heat conducting portion is insulated and connected to the bare battery core through the first insulating layer.

6. The single cell according to claim 1 or 5, characterized in that: The second heat-conducting portion includes a plurality of connected heat-conducting sheets, each of which is coated on one of the outer surfaces; The heat conducting member further comprises: A second insulating layer, wherein the second insulating layer covers at least one of the heat conducting sheets, and the heat conducting sheet is insulated and connected to the housing through the second insulating layer.

7. The single cell according to claim 1, characterized in that: The heat conducting member includes a plurality of the first heat conducting parts, the plurality of the first heat conducting parts are arranged along the first direction, and at least one bare battery core is disposed between two adjacent first heat conducting parts.

8. The single cell according to claim 1, characterized in that: The first heat conducting part is provided with the accommodating space, and the contour shape of the accommodating space in the cross section of the first heat conducting part perpendicular to the first direction is at least one of a circular, elliptical, semicircular, polygonal, and irregular shape; and / or, The second heat-conducting portion includes a plurality of connected heat-conducting sheets, each of which is coated on one of the outer surfaces and is insulated and connected to the shell; at least one of the heat-conducting sheets is provided with the accommodating space, and the contour shape of the accommodating space in the cross-section of the heat-conducting sheet perpendicular to its thickness direction is at least one of a circular, elliptical, semicircular, polygonal, and irregular shape.

9. The single cell according to claim 1, characterized in that: The first heat conducting part and the second heat conducting part are an integrated structure.

10. A battery pack, characterized in that: The invention comprises a single cell according to any one of claims 1 to 9.

11. An electrical device, characterized in that: The method comprises a single cell according to any one of claims 1 to 9, or a battery pack according to claim 10.

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