Battery monomer, heat conduction device, battery and power utilization device

Abstract

The utility model discloses a battery monomer, a heat conduction device, a battery and a power utilization device, the battery monomer comprises at least two naked battery cells, a shell and the heat conduction device, the heat conduction device comprises a first heat conduction piece, a second heat conduction piece and a third heat conduction piece, the second heat conduction piece is connected with the first heat conduction piece, and an included angle is formed between the first heat conduction piece and the second heat conduction piece; the flame retardant is arranged in the included angle; the naked battery cells and the heat conduction device are arranged in the shell, and the second heat conduction piece is arranged between the two naked battery cells. Through the mode, the natural phenomenon of the naked battery cells in the battery monomers can be prevented while the temperature equalization is performed on the two naked battery cells, so that the naked battery cells cannot be burnt, the spontaneous combustion phenomenon of the battery monomers is not easy to occur, and the safety effect is improved.

Description

Technical Field

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

[0002] In some electrical devices, especially electric vehicles or hybrid vehicles, a large number of batteries are required to provide power for the vehicle. The main component of the battery is the battery cell, and many battery cells are provided with two bare cells. Compared with the battery cell with one bare cell, the battery cell with two bare cells may have uneven heating. Therefore, it is necessary to provide a heat conduction device in the housing of the battery cell to conduct the heat between the two bare cells.

[0003] In some cases, the heat of both bare battery cells is high and they may easily spontaneously combust, causing damage to the battery cells and posing a safety hazard. Utility Model Content

[0004] The present application provides a battery cell, a heat conduction device, a battery and an electrical device, which can solve the problem that a battery cell with two bare cells is prone to spontaneous combustion, thereby causing damage to the battery cell and posing a safety hazard.

[0005] In order to solve the above technical problems, a technical solution adopted in the present application is: providing a battery cell, the battery cell comprising at least two bare cells, a shell and a heat-conducting device, the heat-conducting device comprising: a first heat-conducting member; a second heat-conducting member connected to the first heat-conducting member, and an angle is formed between the first heat-conducting member and the second heat-conducting member; a flame retardant, arranged in the angle; the bare cells and the heat-conducting device are arranged in the shell, and the second heat-conducting member is arranged between the two bare cells.

[0006] Through the above method, the temperature of the two bare cells can be evenly balanced while preventing the bare cells in the battery cell from burning, thereby making it less likely for the battery cell to spontaneously combust, thereby improving safety.

[0007] In some embodiments, the number of the first heat conductive member is one, one end of the second heat conductive member is connected to the middle portion of the first heat conductive member, and the first heat conductive member is in contact with the same side of the two bare battery cells.

[0008] This structure is simple and can conduct heat between two bare cells while occupying a small space.

[0009] In some embodiments, there are two first thermal conductors, which are respectively located on opposite sides of the second thermal conductor, and the two first thermal conductors respectively contact different sides of the two bare battery cells, or one of the two first thermal conductors contacts the first side of the two bare battery cells, and the other first thermal conductor contacts the second side of the two bare battery cells, and the first side of the bare battery cell is arranged opposite to the second side of the bare battery cell.

[0010] This structure can conduct heat to different sides or multiple sides of the bare battery cell, thereby improving the heat conduction effect of the bare battery cell.

[0011] In some embodiments, the first heat conductor abuts against the housing.

[0012] The first heat-conducting member contacts the shell, so that the heat generated by the bare battery cell can be transferred to the shell through the first heat-conducting member, thereby achieving a heat dissipation effect.

[0013] In some embodiments, the first heat conductor is spaced apart from the housing.

[0014] The first heat-conducting member is spaced apart from the shell so as to only contact the bare battery cell, thereby equalizing the temperature of the two bare battery cells and ensuring the temperature equalization effect. In cold conditions, the normal operating temperature of the bare battery cell can be ensured.

[0015] In some embodiments, the heat conducting device includes: a first heat conducting member; a second heat conducting member connected to the first heat conducting member, and an angle is formed between the first heat conducting member and the second heat conducting member; and a flame retardant disposed in the angle.

[0016] By adding flame retardants to the heat conducting device, the natural phenomenon of the bare cells in the battery cells can be prevented from occurring, making them unable to burn, thereby making the battery cells less likely to spontaneously combust, thereby improving safety effects.

[0017] In some embodiments, the heat-conducting device further includes a hot-melt insulation layer, which is disposed at the angle, connects the first heat-conducting component and the second heat-conducting component, and cooperates with the first heat-conducting component and the second heat-conducting component to form a accommodating space at the angle; the flame retardant is disposed in the accommodating space.

[0018] By setting the hot-melt barrier, the flame retardant can be separated from the bare battery cell under normal circumstances, thereby reducing the impact of the flame retardant on the bare battery cell, and liquid or gaseous flame retardant can be used, increasing the selection range of flame retardants.

[0019] In some embodiments, the heat-conducting device further includes a hot-melt insulation layer, the flame retardant is wrapped by the hot-melt insulation layer, and the hot-melt insulation layer is arranged at the angle.

[0020] This setting method can better limit the flame retardant, reduce the impact of the flame retardant on the bare battery cell, and also increase the selection range of the flame retardant.

[0021] In some embodiments, the melting temperature of the hot melt barrier is not less than 80°C and not more than 150°C.

[0022] This temperature setting can release the flame retardant before the bare battery cell spontaneously combusts, thereby preventing the bare battery cell from spontaneously combusting in time.

[0023] In some embodiments, the melting temperature of the hot-melt barrier is not less than 100°C and not more than 120°C.

[0024] This temperature range setting is more reasonable, and it is good to release the flame retardant before the bare battery cell spontaneously combusts, thereby preventing the bare battery cell from spontaneously combusting in time.

[0025] In some embodiments, there are at least two first heat-conducting members, which are respectively located on opposite sides of the second heat-conducting member. A plurality of angles are formed between the first heat-conducting member and the second heat-conducting member, and the flame retardant is disposed at at least two of the angles.

[0026] The addition of the first heat-conducting member can make more surfaces of the bare battery cell contact with the first heat-conducting member, thereby improving the temperature conduction effect of the heat-conducting device. In addition, the addition of the first heat-conducting member can also increase the number of angles, thereby increasing the amount of flame retardant and improving the flame retardant effect.

[0027] In some embodiments, each of the angles is one of a right angle structure, an obtuse angle structure, an acute angle structure, and an arc structure.

[0028] The diversification of the angle shapes can make it adaptable to bare cells of various shapes.

[0029] In some embodiments, the included angle and the hot-melt barrier together form one of a right-angle structure, an obtuse-angle structure, an acute-angle structure, an arc structure, and a chamfered structure.

[0030] The common shape of the angle and the hot-melt barrier can be adapted according to the style of the bare battery cell, thereby achieving a good flame retardant effect.

[0031] In some embodiments, there are two first heat-conducting members, and opposite ends of the second heat-conducting member are respectively connected to the middle parts of the two first heat-conducting members.

[0032] This structure makes the two parts of the two first heat-conducting members separated by the second heat-conducting member have the same size, which is more suitable for a battery cell with double bare cells.

[0033] In some embodiments, the second heat conducting member is perpendicular to the first heat conducting member.

[0034] The second heat conducting member is perpendicular to the first heat conducting member, which can facilitate the placement of the bare battery cells and make the placement of the bare battery cells more regular.

[0035] In some embodiments, the hot melt barrier is wax.

[0036] Wax is a very common hot-melt material, which can solidify at room temperature and melt when heated to a certain temperature. Using wax as a hot-melt interlayer has low cost and good hot-melt effect.

[0037] In some embodiments, the hot melt barrier is disposed adjacent to the bare battery cell.

[0038] The hot-melt barrier is arranged close to the bare battery core so that the hot-melt barrier can directly feel the temperature of the bare battery core, thereby achieving the effect that the hot-melt barrier can react quickly.

[0039] In some embodiments, the flame retardant is a mixture of one or more of dimethyl methylphosphonate, trimethyl phosphate, triethyl phosphate, and tricresyl phosphate.

[0040] The flame retardant has a good flame retardant effect and can prevent the occurrence of natural phenomena of bare cells in battery cells.

[0041] In order to solve the above technical problems, a technical solution adopted in the present application is: to provide a heat-conducting device, including: a first heat-conducting member; a second heat-conducting member connected to the first heat-conducting member, and an angle is formed between the first heat-conducting member and the second heat-conducting member; and a flame retardant arranged in the angle.

[0042] By adding flame retardants to the heat conducting device, the natural phenomenon of the bare battery cells in the battery monomer provided with the heat conducting device can be prevented from occurring, making it impossible for them to burn, thereby making the battery monomer less likely to spontaneously combust, thereby improving the safety effect.

[0043] In some embodiments, the heat-conducting device further includes a hot-melt insulation layer, which is disposed at the angle, connects the first heat-conducting component and the second heat-conducting component, and cooperates with the first heat-conducting component and the second heat-conducting component to form a accommodating space at the angle; the flame retardant is disposed in the accommodating space.

[0044] By setting the hot-melt barrier, the flame retardant can be separated from the bare battery cell under normal circumstances, thereby reducing the impact of the flame retardant on the bare battery cell, and liquid or gaseous flame retardant can be used, increasing the selection range of flame retardants.

[0045] In some embodiments, the heat-conducting device further includes a hot-melt insulation layer, the flame retardant is wrapped by the hot-melt insulation layer, and the hot-melt insulation layer is arranged at the angle.

[0046] This setting method can better limit the flame retardant, reduce the impact of the flame retardant on the bare battery cell, and also increase the selection range of the flame retardant.

[0047] In some embodiments, the melting temperature of the hot melt barrier is not less than 80°C and not more than 150°C.

[0048] This temperature setting can release the flame retardant before the bare battery cell spontaneously combusts, thereby preventing the bare battery cell from spontaneously combusting in time.

[0049] In some embodiments, the melting temperature of the hot-melt barrier is not less than 100°C and not more than 120°C.

[0050] This temperature range setting is more reasonable, and it is good to release the flame retardant before the bare battery cell spontaneously combusts, thereby preventing the bare battery cell from spontaneously combusting in time.

[0051] In some embodiments, there are at least two first heat-conducting members, which are respectively located on opposite sides of the second heat-conducting member. A plurality of angles are formed between the first heat-conducting member and the second heat-conducting member, and the flame retardant is disposed at at least two of the angles.

[0052] The addition of the first heat-conducting member can make more surfaces of the bare battery cell contact with the first heat-conducting member, thereby improving the temperature conduction effect of the heat-conducting device. In addition, the addition of the first heat-conducting member can also increase the number of angles, thereby increasing the amount of flame retardant and improving the flame retardant effect.

[0053] In some embodiments, each of the angles is one of a right angle structure, an obtuse angle structure, an acute angle structure, and an arc structure.

[0054] The diversification of the angle shapes can make it adaptable to bare cells of various shapes.

[0055] In some embodiments, the included angle and the hot-melt barrier together form one of a right-angle structure, an obtuse-angle structure, an acute-angle structure, an arc structure, and a chamfered structure.

[0056] The common shape of the angle and the hot-melt barrier can be adapted according to the style of the bare battery cell, thereby achieving a good flame retardant effect.

[0057] In some embodiments, there are two first heat-conducting members, and opposite ends of the second heat-conducting member are respectively connected to the middle parts of the two first heat-conducting members.

[0058] This structure makes the two parts of the two first heat-conducting members separated by the second heat-conducting member have the same size, which is more suitable for a battery cell with double bare cells.

[0059] In some embodiments, the second heat conducting member is perpendicular to the first heat conducting member.

[0060] The second heat conducting member is perpendicular to the first heat conducting member, which can facilitate the placement of the bare battery cells and make the placement of the bare battery cells more regular.

[0061] In some embodiments, the flame retardant is a mixture of one or more of dimethyl methylphosphonate, trimethyl phosphate, triethyl phosphate, and tricresyl phosphate.

[0062] The flame retardant has a good flame retardant effect and can prevent the occurrence of natural phenomena of bare cells in battery cells.

[0063] In order to solve the above technical problems, a technical solution adopted in the present application is: to provide a battery, wherein the battery comprises any one of the battery cells described above.

[0064] Through the above method, the temperature of the two bare cells can be evenly balanced while preventing the bare cells in the battery cell from burning, thereby making the battery cell less likely to spontaneously combust, thereby improving the safety of the battery.

[0065] In order to solve the above technical problem, a technical solution adopted in the present application is: to provide an electric device, the electric device includes the above battery, and the battery is used to supply power to the electric device.

[0066] Through the above method, the temperature of the two bare cells can be evenly balanced while preventing the bare cells in the battery cell from burning, thereby making the battery cell less likely to spontaneously combust, thereby improving the safety of the battery in the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work, among which:

[0068] Figure 1 is a simplified schematic diagram of a vehicle according to some embodiments;

[0069] Figure 2 is an exploded view of a battery according to some embodiments;

[0070] Figure 3 is an exploded view of a battery according to some other embodiments;

[0071] Figure 4 is a schematic structural diagram of a battery cell according to some embodiments;

[0072] Figure 5 is a schematic cross-sectional structure diagram of a battery cell according to some embodiments;

[0073] Figure 6 is a schematic cross-sectional structure diagram of a battery cell according to some other embodiments;

[0074] Figure 7 is a schematic top view of a heat conducting device according to some embodiments;

[0075] Figure 8 is a schematic top view of a heat conducting device according to another embodiment;

[0076] Fig. 9 for Figure 7 A schematic diagram of the side structure of the heat conducting device in FIG.

[0077] Fig.10 for Figure 7 A schematic diagram of the three-dimensional structure of the heat conducting device;

[0078] Fig.11 is a schematic top view of the structure of a heat conducting device according to yet another embodiment;

[0079] Fig.12 is a schematic top view of the structure of a heat conducting device according to some further embodiments;

[0080] Fig.13 for Fig.12 A schematic diagram of the side structure of the heat conducting device in FIG.

[0081] Fig.14 for Fig.12 Schematic diagram of the three-dimensional structure of the heat conducting device in FIG.

[0082] Marking Description:

[0083] Vehicle 1, battery 10, battery cell 20, controller 30, motor 40;

[0084] Box body 11, cover body 111, box shell 112, bottom plate 112a, electrical cavity 11a, current collecting component 12, support beam 114, housing 21, bare battery cell 22;

[0085] A heat-conducting device 50 , a first heat-conducting member 51 , a second heat-conducting member 52 , a flame retardant 53 , a hot-melt barrier 54 , and an accommodating space 511 . DETAILED DESCRIPTION

[0086] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings showing multiple embodiments of the present application. It should be understood that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments described in the present application, all other embodiments obtained by ordinary technicians in this field without spending creative work will fall within the scope of protection of the present application.

[0087] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those generally understood by technicians in the technical field of this application; the terms used in the specification of the application are only for the purpose of describing specific implementation methods, and are not intended to limit this application; the terms "including", "comprising", "having", "having", "containing", "including", etc. in the specification and claims of this application and the above-mentioned figure description are open-ended words. Therefore, "including", "comprising", "having" is a method or device with one or more steps or elements, for example, which has one or more steps or elements, but is not limited to having only these one or more elements. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned figures are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, the meaning of "multiple" is two or more.

[0088] In the description of the present application, it should be understood that the terms "center", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0089] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0090] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0091] As mentioned above, it should be emphasized that when the term "includes / comprising" is used in this specification, it is used to clearly indicate the presence of the features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps, components or groups of features, integers, steps, components. As used in this application, the singular forms "a", "an" and "the" also include plural forms, unless the context clearly indicates otherwise.

[0092] The words "a" and "an" in this specification may mean one, but may also be consistent with the meaning of "at least one" or "one or more". The term "about" generally means plus or minus 10% of the mentioned value, or more specifically plus or minus 5%. The term "or" used in the claims means "and / or" unless it is clearly stated that it refers to only alternative solutions.

[0093] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0094] The battery mentioned in the embodiments disclosed in this application refers to a single physical module including one or more battery cells to provide a predetermined voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack, etc. The battery cell is the basic unit in the battery, and can generally be divided into: cylindrical battery cells, square battery cells and soft-pack battery cells according to the packaging method. The following will mainly focus on square battery cells. It should be understood that the embodiments described below are also applicable to cylindrical battery cells or soft-pack battery cells in some aspects.

[0095] A battery cell includes a positive electrode sheet, a negative electrode sheet, an electrolyte and a separator. Lithium-ion battery cells mainly rely on the movement of lithium ions between the positive electrode sheet and the negative electrode sheet to work. For example, a lithium-ion battery cell uses an embedded lithium compound as an electrode material. The main common positive electrode materials currently used as lithium-ion batteries are: lithium cobalt oxide (LiCoO2), lithium manganese oxide (LiMn2O4), lithium nickel oxide (LiNiO2) and lithium iron phosphate (LiFePO4). The separator is arranged between the positive electrode sheet and the negative electrode sheet to form a thin film structure with three layers of material. The thin film structure is generally made into an electrode assembly with a desired shape by winding or stacking. For example, the thin film structure of the three layers of material in the cylindrical battery cell is wound into a cylindrical electrode assembly, while the thin film structure in the square battery cell is wound or stacked into an electrode assembly with a roughly rectangular shape.

[0096] Multiple battery cells can be connected in series and / or in parallel via electrode terminals for various applications. In some high-power applications such as electric vehicles, the application of batteries includes three levels: battery cells, battery modules and batteries. The battery module is formed by electrically connecting a certain number of battery cells together and placing them in a frame in order to protect the battery cells from external impact, heat, vibration, etc. The battery is the final state of the battery system installed in the electric vehicle. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells. The box generally consists of a cover and a box shell, and the box shell generally includes a bottom plate and an outer plate. The outer plate extends from the edge of the bottom plate, generally perpendicular to the bottom plate, and the bottom plate and the outer plate form a containing space with an opening for accommodating battery cells or battery modules. The cover covers the opening of the containing space, is arranged opposite to the bottom plate, and is connected to the outer plate. The box shell and the cover can be detachably connected or sealed. Most of the current batteries are made by assembling various control and protection systems such as battery management systems (BMS) and thermal management components on one or more battery modules. With the development of technology, the battery module level can be omitted, that is, the battery is directly formed by battery cells. Multiple battery cells connected together are called battery modules. This improvement has increased the weight energy density and volume energy density of the battery system while significantly reducing the number of components. The batteries mentioned in this application include battery modules or batteries.

[0097] In some cases, a battery cell includes a shell and two bare cells, and the two bare cells are arranged in the accommodating space of the shell. Since two bare cells are arranged in the shell, it is necessary to equalize the temperature or transfer heat to the two bare cells. Therefore, a temperature equalizing structure or a heat conducting device is usually provided in the shell. The temperature equalizing structure or the heat conducting device will be arranged close to the two bare cells. However, the existing temperature equalizing structure or heat conducting device can only equalize or conduct the heat generated by the two bare cells, and when the heat of the two bare cells is too high, it may cause spontaneous combustion of the bare cells, thereby causing the battery cell to burn or be damaged, and there is a safety hazard.

[0098] In order to solve the problem that the battery cells of two bare cells are prone to spontaneous combustion, which leads to damage to the battery cells and potential safety hazards, it can be noted that the main reason is that the temperature equalization structure or the heat-conducting device can only balance or conduct the heat generated by the two bare cells, but cannot prevent combustion. Therefore, the combustion of the bare cells can be prevented by flame-retardant treatment of the temperature equalization device or the heat-conducting device. For example, a flame retardant can be added to the temperature equalization device or the heat-conducting device to prevent the combustion of the bare cells. Therefore, the heat-conducting device can be configured to include a first heat-conducting member, a second heat-conducting member and a flame retardant, the first heat-conducting member is connected to the second heat-conducting member, and an angle is formed between the first heat-conducting member and the second heat-conducting member; the flame retardant is arranged in the angle. In this way, the flame retardant can prevent the combustion of the bare cells, so that the battery cells are not prone to spontaneous combustion, and the safety effect of using bare cells and battery cells is improved.

[0099] Based on the above considerations, in order to solve the problem that the battery cells of two bare cells are prone to spontaneous combustion, thereby causing damage to the battery cells and posing a safety hazard, a heat conduction device, a battery cell, a battery and an electrical device are designed.

[0100] For example, Figure 1 As shown, this figure is a simple schematic diagram of a vehicle 1 in which an electric device according to some embodiments is used. The vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 10 can be arranged inside the vehicle 1, for example, a battery 10 can be arranged at the bottom, front or rear of the vehicle 1. The battery 10 can be used to power the vehicle 1, for example, the battery 10 can be used as an operating power source for the vehicle 1. And the vehicle 1 can also include a controller 30 and a motor 40. The controller 30 is used to control the battery 10 to power the motor 40, for example, for the working power demand of the vehicle 1 during starting, navigation and driving. In another embodiment of the present application, the battery 10 can not only be used as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1. The battery 10 referred to below can also be understood as a battery including a plurality of battery cells 20.

[0101] Figure 2 and Figure 3 1 and 2 show exploded views of a battery 10 according to some embodiments. Figure 2 and Figure 3 As shown, the battery 10 includes a plurality of battery cells 20 and a busbar 12 for electrically connecting the plurality of battery cells 20. In order to protect the battery cells 20 from being invaded or corroded by external liquids or foreign objects, the battery 10 includes a housing 11, which is used to encapsulate the plurality of battery cells and other necessary components, such as Figure 2 and Figure 3 As shown. In some embodiments, the box body 11 may include a cover 111 and a box shell 112, and the battery 10 may further include a support beam 114 extending between the cover 111 and the box shell 112, and the support beam 114 may extend from the bottom plate 112a of the box shell 112 toward the cover 111 in a direction perpendicular to the bottom plate 112a. The cover 111 and the box shell 112 are sealed together to jointly surround and form an electrical cavity 11a for accommodating a plurality of battery cells 20. In some other embodiments, the cover 111 and the box shell 112 may also be combined with each other without being sealed.

[0102] See also Figures 4 to 6 , Figure 4 is a schematic structural diagram of a battery cell 20 according to some embodiments, Figure 5 is a schematic cross-sectional structure diagram of a battery cell 20 according to some embodiments, Figure 6 2 is a schematic diagram of a cross-sectional structure of a battery cell 20 according to other embodiments. The battery cell 20 includes at least two bare cells 22, a housing 21, and a heat conducting device 50. The heat conducting device 50 is any of the heat conducting devices 50 described above, the bare cells 22 and the heat conducting device 50 are arranged in the housing 21, and the second heat conducting member 52 is arranged between the two bare cells 22. Figure 7 As shown, Figure 7 Schematic diagram of a top view of a heat conducting device 50 according to some embodiments. In some embodiments, the heat conducting device 50 includes a first heat conducting member 51, a second heat conducting member 52, and a flame retardant 53. The second heat conducting member 52 is connected to the first heat conducting member 51, and an angle is formed between the first heat conducting member 51 and the second heat conducting member 52. The flame retardant 53 is disposed in the angle.

[0103] The first heat conductor 51 and the second heat conductor 52 can be a sheet structure, a plate structure, an arc plate structure, etc. The second heat conductor 52 is used to abut against the surfaces of the two bare cells facing each other, and is sandwiched between the two bare cells. The first heat conductor 51 is used to abut against the surfaces of the two bare cells that are not facing each other, but the surface of the bare cell against which the first heat conductor 51 abuts is arranged adjacent to the surface of the bare cell against the second heat conductor 52. The first heat conductor 51 and the second heat conductor 52 can be the same material or different materials. For example, the first heat conductor 51 and the second heat conductor 52 can be a metal material, or a non-metallic heat-conducting material, such as graphite, graphene, etc., or a composite material of the two or more. The composite method of the material can be a physical mixture or a layer-by-layer composite, such as a composite of a layer of metal and a layer of graphite. The metal can be iron, steel, copper, aluminum, or an alloy of the above metals, etc. In some embodiments, the first heat conductor 51 and / or the second heat conductor 52 are pyrolytic graphite, a material with high thermal conductivity. The first heat conductor 51 and the second heat conductor 52 can conduct heat between adjacent bare cells, and can achieve functions that require heat conduction, such as temperature equalization or heat dissipation between two bare cells. The first heat conductor 51 and the second heat conductor 52 can be an integrally formed structure, or a structure connected by conventional connection methods such as welding and pasting. The position where the first heat conductor 51 and the second heat conductor 52 are connected forms an angle, and at least two angles are formed. The two angles are respectively located in the same space as the two bare cells and are separated by the second heat conductor 52. That is, each bare cell corresponds to at least one angle. The flame retardant 53, also known as a flame retardant, refers to an important auxiliary agent that can increase the flame retardancy of flammable or combustible materials, prevent materials from being ignited, and inhibit the spread of flames.

[0104] The surfaces of the two bare cells 22 facing each other are in contact with the heat-conducting device 50, or in other words, the two bare cells 22 clamp the second heat-conducting member 52. When the number of bare cells 22 increases, for example, when there are three bare cells 22, four bare cells 22 or more, the number of second heat-conducting members 52 can be increased as needed, and the number of first heat-conducting members 51 can also be increased at the same time. For example, the number of second heat-conducting members 52 is the number of bare cells 22 minus one, or the number of second heat-conducting members 52 is half the number of bare cells 22, until it is ensured that at least one side of each bare cell 22 is in contact with the second heat-conducting member 52. Fig.13 As shown in FIG. 1 , when the hot melt barrier 54 cooperates with the included angle to form a chamfered structure, a small portion of the surface of the hot melt barrier 54 facing the bare battery core 22 contacts the bare battery core 22. The small portion of the surface of the hot melt barrier 54 facing the bare battery core 22 is less than half of the surface of the hot melt barrier 54. Fig.14As shown, when the hot melt barrier 54 cooperates with the included angle to form an arc structure, most or all of the surface of the hot melt barrier 54 facing the bare battery 22 is in contact with the bare battery 22. Most of the surface of the hot melt barrier 54 facing the bare battery 22 is more than half of the surface of the hot melt barrier 54.

[0105] By adopting the above method, the temperature of the two bare cells 22 can be evenly balanced while preventing the bare cells 22 in the battery cell 20 from spontaneously igniting, thereby preventing the bare cells 22 from burning. This makes the battery cell 20 less likely to spontaneously ignite, thereby improving safety.

[0106] In some embodiments, the number of the first heat conductive member 51 is one, one end of the second heat conductive member 52 is connected to the middle of the first heat conductive member 51 , and the first heat conductive member 51 is in contact with the same side of the two bare battery cells 22 .

[0107] This structure is a T-shaped structure, and the first heat conducting member 51 only contacts one side of the two bare battery cells 22. This structure uses less material, saves cost, and is simple to manufacture, and is suitable for some low-power battery cells 20.

[0108] This structure is simple and can conduct heat between the two bare cells 22 while occupying a small space.

[0109] In some embodiments, the number of the first heat conducting members 51 is two, which are respectively located on two opposite sides of the second heat conducting member 52. Figure 8 , the two first heat conducting members 51 are respectively against different sides of the two bare cells 22. Alternatively, refer to Figure 5 One of the two first heat conducting members 51 contacts the first side of the two bare cells 22, and the other first heat conducting member 51 contacts the second side of the two bare cells 22. The first side of the bare cell 22 is disposed opposite to the second side of the bare cell 22.

[0110] This structure can conduct heat to different sides or multiple sides of the bare battery cell 22 , thereby improving the heat conduction effect of the bare battery cell 22 .

[0111] In some embodiments, the first heat conducting member 51 contacts the housing 21 .

[0112] The first heat-conducting member 51 contacts the shell 21, and the heat generated by the bare cell 22 can be conducted to the shell 21 through the first heat-conducting member, and then the heat is dissipated through the shell 21, thereby achieving the effect of dissipating the heat of the bare cell 22, so that the heat-conducting device 50 can not only equalize the temperature of the bare cell 22, but also dissipate the heat of the bare cell 22.

[0113] The first heat-conducting member 51 contacts the housing 21 , and the heat generated by the bare battery cell 22 can be transferred to the housing 21 through the first heat-conducting member 51 , thereby achieving a heat dissipation effect.

[0114] In some embodiments, the first heat conductor 51 is spaced apart from the housing 21 .

[0115] The first heat conducting member 51 is spaced apart from the housing 21, so that the heat conducting device 50 and the bare battery cell 22 can be wrapped together with an insulating film or a blue film to form an integrated structure. In this case, the temperature equalization effect of the heat conducting device 50 will be improved.

[0116] The first heat conductor 51 is spaced apart from the shell 21 so as to only contact the bare cells 22 , thereby equalizing the temperature of the two bare cells 22 and ensuring the temperature equalization effect. In cold conditions, the normal operating temperature of the bare cells 22 can be ensured.

[0117] like Figures 8 to 10 As shown, Figure 8 FIG. 5 is a schematic top view of a heat conducting device 50 according to another embodiment. Fig. 9 for Figure 8 A schematic side view of the heat conducting device 50 in FIG. Fig.10 for Figure 8 Schematic diagram of the three-dimensional structure of the heat-conducting device 50 in FIG. In some embodiments, the heat-conducting device 50 further includes a hot-melt barrier 54. The hot-melt barrier 54 is disposed at the angle, connects the first heat-conducting member 51 and the second heat-conducting member 52, and cooperates with the first heat-conducting member 51 and the second heat-conducting member 52 to form an accommodation space 511 at the angle. The flame retardant 53 is disposed in the accommodation space 511.

[0118] The hot-melt barrier 54 is a barrier that is solid at room temperature and can melt when a preset temperature is reached. The hot-melt barrier 54 can cooperate with the first heat-conducting member 51 and the second heat-conducting member 52 to form a sealed accommodation space 511 at the angle, or it can form an accommodation space 511 with one or more openings. The flame retardant 53 can be directly filled in the accommodation space 511, or the flame retardant 53 can be placed at the angle first, and then the hot-melt barrier 54 is set to seal the flame retardant 53. The hot-melt barrier 54 can be paraffin, etc., or polyvinyl chloride, polyethylene, etc. It should be noted that the hot-melt barrier 54, the flame retardant 53, the first heat-conducting member 51 and the second heat-conducting member 52 do not react with the substances in the battery cell 20, and the substances in the battery cell 20 include bare cells, electrolytes, etc.

[0119] By setting the hot-melt barrier 54, the flame retardant 53 can be separated from the bare battery cell under normal circumstances, thereby reducing the impact of the flame retardant 53 on the bare battery cell, and liquid or gaseous flame retardant 53 can be used, increasing the selection range of the flame retardant 53.

[0120] In some embodiments, the heat-conducting device 50 further includes a hot-melt insulation layer 54 , the flame retardant 53 is wrapped by the hot-melt insulation layer 54 , and the hot-melt insulation layer 54 is disposed at the angle.

[0121] This structure is that the hot-melt barrier 54 includes a flame retardant 53, and the flame retardant 53 is wrapped into one or more particles. The flame retardant 53 can be wrapped into various shapes as needed, such as a long strip, a triangular prism, a fan-shaped column structure, etc. Then, the hot-melt barrier 54 and the flame retardant 53 wrapped by it are arranged at the angle, which is similar to the previous embodiment. Since this arrangement can completely wrap the flame retardant 53, the flame retardant 53 can also be selected as a liquid or a gas, such as an inert gas and a non-flammable liquid.

[0122] This arrangement can better limit the flame retardant 53, reduce the impact of the flame retardant 53 on the bare battery cell, and also increase the selection range of the flame retardant 53. In some embodiments, the melting temperature of the hot melt barrier 54 is not less than 80°C and not more than 150°C.

[0123] For example, the melting temperature of the hot melt interlayer 54 can be 80°C, 85°C, 90°C, 95°C, 100°C, 105°C, 110°C, 115°C, 120°C, 125°C, 130°C, 135°C, 140°C, 145°C, 150°C, etc. The melting temperature of the hot melt interlayer can be tested using equipment and methods known in the art for testing melting points. For example, differential scanning calorimetry can be used for determination. For details, reference can be made to standard GB / T 19466.3-2004. As an example, the determination can be carried out according to the following method: take 4mg-6mg of the sample to be tested, place it in the sample chamber of the differential scanning calorimeter, increase the temperature from 25°C to 400°C, and the heating rate is 10°C / min, and obtain the melting endothermic curve of the sample. The temperature corresponding to the peak of the curve is the melting point of the sample.

[0124] This temperature setting can release the flame retardant 53 before the bare battery cell spontaneously combusts, thereby preventing the bare battery cell from spontaneously combusting in time.

[0125] In some embodiments, the melting temperature of the hot-melt barrier 54 is not less than 100°C and not more than 120°C.

[0126] For example, the melting temperature of the hot melt barrier 54 may be 100° C., 103° C., 105° C., 107° C., 110° C., 112° C., 115° C., 118° C., 120° C., etc.

[0127] This temperature range setting is more reasonable, and the flame retardant 53 can be released before the bare battery cell spontaneously combusts, thereby preventing the bare battery cell from spontaneously combusting in time.

[0128] In some embodiments, there are two first heat conducting members 51, which are respectively located on opposite sides of the second heat conducting member 52. Multiple angles, such as four angles, are formed between the first heat conducting member 51 and the second heat conducting member 52, and at least two of the angles are provided with flame retardants 53. Alternatively, in some embodiments, there are more than two first heat conducting members 51.

[0129] When there are two or more first heat-conducting members 51, the first heat-conducting members 51 are respectively located on opposite sides of the second heat-conducting member 52, and one side of the second heat-conducting member 52 is connected to one or two first heat-conducting members 51. Fig.11 As shown, Fig.11 : is a schematic diagram of a top view of the structure of a heat-conducting device 50 according to another embodiment. In some embodiments, there are two first heat-conducting members 51, which are respectively arranged on opposite sides of the second heat-conducting member 52, and extend in opposite directions from the connection with the second heat-conducting member 52. This structure is a Z-shaped structure, and the two first heat-conducting members 51 respectively contact the side surfaces of the bare battery cells in opposite directions, and can conduct heat between the side surfaces of the two bare battery cells in opposite directions. In this structure, there is only an angle structure between each first heat-conducting member 51 and the second heat-conducting member 52, so as to cooperate with the hot-melt barrier layer 54 to form an accommodating space 511. As shown Figure 8 As shown, in some embodiments, there are two first heat-conducting members 51, which are respectively arranged on opposite sides of the second heat-conducting member 52. However, in some embodiments, the second heat-conducting member 52 is connected to the middle position of the first heat-conducting member 51, rather than the edge position. Therefore, in some embodiments, each first heat-conducting member 51 can form two angle structures with the second heat-conducting member 52, thereby forming two accommodating spaces 511 in conjunction with the hot-melt insulation layer 54, and the two first heat-conducting members 51 can form four accommodating spaces 511 with the second heat-conducting member 52 and the hot-melt insulation layer 54. In addition, Figure 8 It can also be considered as including three first heat conducting members 51 or four first heat conducting members 51. Fig.10 If three first heat-conducting members 51 are included, there is one first heat-conducting member 51 on one side of the second heat-conducting member 52, and the second heat-conducting member 52 is connected to the middle of the first heat-conducting member 51; there are two first heat-conducting members 51 on the other side of the second heat-conducting member 52, and the edges of the two first heat-conducting members 51 are connected to the other end of the second heat-conducting member 52. Figure 5 When it is considered to include four first heat-conducting members 51 , the two opposite sides of the second heat-conducting member 52 are connected to two first heat-conducting members 51 and are connected to the edges of the first heat-conducting members 51 ; the two first heat-conducting members 51 on one side of the second heat-conducting member 52 extend from the second heat-conducting member 52 in opposite directions.

[0130] The addition of the first heat-conducting member 51 can make more surfaces of the bare battery cell contact with the first heat-conducting member 51, thereby improving the temperature conduction effect of the heat-conducting device 50. In addition, the addition of the first heat-conducting member 51 can also increase the number of angles, thereby increasing the amount of the flame retardant 53 and improving the flame retardant effect.

[0131] In some embodiments, each angle is one of a right angle structure, an obtuse angle structure, an acute angle structure, and an arc structure.

[0132] If the angle is a right angle structure, the first heat conductive member 51 and the second heat conductive member 52 are perpendicular at the connection. If the angle is an obtuse angle structure or an acute angle structure, the first heat conductive member 51 and the second heat conductive member 52 are inclined at the connection and are not perpendicular. If the angle is an arc structure, the first heat conductive member 51 is an arc structure at the position where it is connected to the second heat conductive member 52, and the end of the second heat conductive member 52 connected to the first heat conductive member 51 is also an arc structure.

[0133] The diversification of the angle shapes can make it adaptable to bare cells of various shapes.

[0134] In some embodiments, the angle and the hot melt barrier layer 54 together form one of a right angle structure, an obtuse angle structure, an acute angle structure, an arc structure, and a chamfered structure. In a heat conducting device 50, an angle and a hot melt barrier layer 54 can be one of the above structures, and another angle and another hot melt barrier layer 54 can be another of the above structures.

[0135] like Figure 8 As shown, the angle and the hot-melt insulation layer 54 together form a chamfered structure. When the angle and the hot-melt insulation layer 54 together form a chamfered structure, the manufacturing is simplest. In addition, the hot-melt insulation layer 54 can also form a right angle structure, an obtuse angle structure or an acute angle structure in conjunction with the angle, and the hot-melt insulation layer 54 only needs to be made into a corresponding shape. Figures 12 to 14 As shown, Fig.12 is a schematic diagram of a top view of a heat conducting device according to some further embodiments, Fig.13 for Fig.12 A schematic diagram of the side view of the heat conduction device in FIG. Fig.14 for Fig.12 Schematic diagram of the three-dimensional structure of the heat conducting device in. In some embodiments, the angle is a right angle structure, and the hot melt barrier 54 is arranged in an arc shape, so the hot melt barrier 54 forms an arc structure in accordance with the angle. When the hot melt barrier 54 forms an arc structure in accordance with the angle, the hot melt barrier 54 best fits the shape of the bare battery cell and can contact the bare battery cell with the largest area.

[0136] The common shape of the angle and the hot-melt barrier 54 can be adapted according to the style of the bare battery cell, thereby achieving a good flame retardant effect.

[0137] In some embodiments, there are two first heat conducting members 51 , and opposite ends of the second heat conducting member 52 are respectively connected to the middle portions of the two first heat conducting members 51 .

[0138] The middle of the first heat conducting member 51 is a position in the first heat conducting member 51 that is equidistant from both ends, or is a position where the symmetry axis of the first heat conducting member 51 is located. When the first heat conducting member 51 is a rectangular structure, the middle of the first heat conducting member 51 is a symmetry axis of the rectangular structure.

[0139] This structure makes the two parts of the two first heat-conducting members 51 separated by the second heat-conducting member 52 have the same size, which is more suitable for the battery cell 20 of the double bare battery cell.

[0140] In some embodiments, the second heat conducting member 52 is perpendicular to the first heat conducting member 51 .

[0141] When the second heat-conducting member 52 is perpendicular to the first heat-conducting member 51, it can be ensured that the included angles are all right angles, and the areas of the sides of the two bare cells that touch the first heat-conducting member 51 are the same. After being flattened or stacked, the two bare cells are also perpendicular to the first heat-conducting member 51 or arranged in parallel with the first heat-conducting member 51, which can make the arrangement of the heat-conducting device 50 and the two bare cells in the battery cell 20 more regular, and facilitate the use of the most commonly used square shell to hold the bare cells and the heat-conducting device 50.

[0142] The second heat conducting member 52 is perpendicular to the first heat conducting member 51 , which can facilitate the placement of the bare battery cells and make the placement of the bare battery cells more regular.

[0143] In some embodiments, the hot melt barrier 54 is wax.

[0144] Wax is a common hot-melt substance that can solidify at room temperature and melt when heated to a certain temperature. Wax can be paraffin wax, polyethylene wax, PP wax, etc., or a mixture of at least two of these waxes.

[0145] Using wax as a hot melt interlayer has lower costs and better hot melt effects.

[0146] In some embodiments, the hot melt barrier 54 is disposed adjacent to the bare battery cell 22 .

[0147] The hot melt barrier 54 is arranged close to the bare battery core 22, that is, the hot melt barrier 54 directly contacts the bare battery core 22. This arrangement can ensure that the heat of the bare battery core 22 is immediately and accurately transferred to the hot melt barrier 54.

[0148] The hot melt barrier 54 is disposed close to the bare battery core 22 so that the hot melt barrier 54 can directly sense the temperature of the bare battery core 22 , thereby achieving the effect that the hot melt barrier 54 can react quickly.

[0149] In some embodiments, the flame retardant 53 is a mixture of one or more of dimethyl methylphosphonate, trimethyl phosphate, triethyl phosphate, and tricresyl phosphate.

[0150] Dimethyl methylphosphonate, trimethyl phosphate, triethyl phosphate and trimethylbenzene phosphate are all flame retardants with good flame retardant effects. When the above substances are mixed, they can be mixed evenly by stirring, vibrating, etc., or they can be directly mixed without mixing evenly. The proportion of each substance can be adjusted at will according to demand, and there is no need to make detailed restrictions.

[0151] The flame retardant has a good flame retardant effect and can prevent the occurrence of natural phenomena of bare cells in battery cells.

[0152] The present application also provides a heat conducting device 50. Figure 7 As shown, Figure 7 Schematic diagram of a top view of a heat conducting device according to some embodiments. In some embodiments, the heat conducting device 50 includes a first heat conducting member 51, a second heat conducting member 52, and a flame retardant 53. The second heat conducting member 52 is connected to the first heat conducting member 51, and an angle is formed between the first heat conducting member 51 and the second heat conducting member 52. The flame retardant 53 is disposed in the angle.

[0153] By adding flame retardants to the heat conducting device, the natural phenomenon of the bare battery cells in the battery monomer provided with the heat conducting device can be prevented from occurring, making it impossible for them to burn, thereby making the battery monomer less likely to spontaneously combust, thereby improving the safety effect.

[0154] like Figures 8 to 10 As shown, Figure 8 FIG. 5 is a schematic top view of a heat conducting device 50 according to another embodiment. Fig. 9 for Figure 8 A schematic side view of the heat conducting device 50 in FIG. Fig.10 for Figure 8 Schematic diagram of the three-dimensional structure of the heat-conducting device 50 in FIG. In some embodiments, the heat-conducting device 50 further includes a hot-melt barrier 54. The hot-melt barrier 54 is disposed at the angle, connects the first heat-conducting member 51 and the second heat-conducting member 52, and cooperates with the first heat-conducting member 51 and the second heat-conducting member 52 to form an accommodation space 511 at the angle. The flame retardant 53 is disposed in the accommodation space 511.

[0155] By setting the hot-melt barrier 54, the flame retardant 53 can be separated from the bare battery cell under normal circumstances, thereby reducing the impact of the flame retardant 53 on the bare battery cell, and liquid or gaseous flame retardant 53 can be used, increasing the selection range of the flame retardant 53.

[0156] In some embodiments, the heat-conducting device 50 further includes a hot-melt insulation layer 54 , the flame retardant 53 is wrapped by the hot-melt insulation layer 54 , and the hot-melt insulation layer 54 is disposed at the angle.

[0157] This configuration can better limit the flame retardant 53 , reduce the impact of the flame retardant 53 on the bare battery cell, and also increase the selection range of the flame retardant 53 .

[0158] In some embodiments, the melting temperature of the hot-melt barrier 54 is not less than 80°C and not more than 150°C.

[0159] This temperature setting can release the flame retardant 53 before the bare battery cell spontaneously combusts, thereby preventing the bare battery cell from spontaneously combusting in time.

[0160] In some embodiments, the melting temperature of the hot-melt barrier 54 is not less than 100°C and not more than 120°C.

[0161] This temperature range setting is more reasonable, and the flame retardant 53 can be released before the bare battery cell spontaneously combusts, thereby preventing the bare battery cell from spontaneously combusting in time.

[0162] In some embodiments, there are two first heat conducting members 51, which are respectively located on opposite sides of the second heat conducting member 52. Multiple angles, such as four angles, are formed between the first heat conducting member 51 and the second heat conducting member 52, and at least two of the angles are provided with flame retardants 53. Alternatively, in some embodiments, there are more than two first heat conducting members 51.

[0163] The addition of the first heat-conducting member 51 can make more surfaces of the bare battery cell contact with the first heat-conducting member 51, thereby improving the temperature conduction effect of the heat-conducting device 50. In addition, the addition of the first heat-conducting member 51 can also increase the number of angles, thereby increasing the amount of the flame retardant 53 and improving the flame retardant effect.

[0164] In some embodiments, each angle is one of a right angle structure, an obtuse angle structure, an acute angle structure, and an arc structure.

[0165] The diversification of the angle shapes can make it adaptable to bare cells of various shapes.

[0166] In some embodiments, the angle and the hot melt barrier layer 54 together form one of a right angle structure, an obtuse angle structure, an acute angle structure, an arc structure, and a chamfered structure. In a heat conducting device 50, an angle and a hot melt barrier layer 54 can be one of the above structures, and another angle and another hot melt barrier layer 54 can be another of the above structures.

[0167] The common shape of the angle and the hot-melt barrier 54 can be adapted according to the style of the bare battery cell, thereby achieving a good flame retardant effect.

[0168] In some embodiments, there are two first heat conducting members 51 , and opposite ends of the second heat conducting member 52 are respectively connected to the middle portions of the two first heat conducting members 51 .

[0169] This structure makes the two parts of the two first heat-conducting members 51 separated by the second heat-conducting member 52 have the same size, which is more suitable for the battery cell 20 of the double bare battery cell.

[0170] In some embodiments, the second heat conducting member 52 is perpendicular to the first heat conducting member 51 .

[0171] The second heat conducting member 52 is perpendicular to the first heat conducting member 51 , which can facilitate the placement of the bare battery cells and make the placement of the bare battery cells more regular.

[0172] In some embodiments, the hot melt barrier 54 is wax.

[0173] Using wax as a hot melt interlayer has lower costs and better hot melt effects.

[0174] In some embodiments, the flame retardant 53 is a mixture of one or more of dimethyl methylphosphonate, trimethyl phosphate, triethyl phosphate, and tricresyl phosphate.

[0175] The flame retardant has a good flame retardant effect and can prevent the occurrence of natural phenomena of bare cells in battery cells.

[0176] In some embodiments, a battery includes any of the battery cells 20 described above.

[0177] By adopting the above method, the temperature of the two bare cells 22 can be evenly balanced while preventing the bare cells 22 in the battery cell 20 from spontaneously igniting, thereby preventing the bare cells 22 from burning. This makes the battery cell 20 less likely to spontaneously ignite, thereby improving the safety of the battery.

[0178] In some embodiments, the electrical device includes the above-mentioned battery, and the battery is used to power the electrical device.

[0179] Through the above method, the temperature of the two bare cells 22 can be evenly balanced while preventing the bare cells 22 in the battery cell 20 from spontaneously igniting, thereby preventing the battery cell 20 from burning. This improves the safety of the battery in the electrical device.

[0180] In some specific application scenarios, the battery cells of two bare cells are prone to spontaneous combustion, which may cause damage to the battery cells and pose a safety hazard. The battery cell 20 of the present application includes two bare cells 22, a shell 21 and a heat-conducting device 50. The bare cells 22 and the heat-conducting device 50 are arranged in the shell 21. The heat-conducting device 50 includes a first heat-conducting member 51, a second heat-conducting member 52, a hot-melt barrier 54 and a flame retardant 53. The second heat-conducting member 52 is connected to the first heat-conducting member 51, and an angle is formed between the first heat-conducting member 51 and the second heat-conducting member 52. The hot-melt barrier 54 is arranged at the angle, connecting the first heat-conducting member 51 and the second heat-conducting member 52, and cooperates with the first heat-conducting member 51 and the second heat-conducting member 52 to form a receiving space 511 at the angle. The flame retardant 53 is arranged in the receiving space 511, so that the flame retardant 53 is arranged in the angle. There are two first heat conducting members 51, which are respectively located on opposite sides of the second heat conducting member 52. Multiple angles are formed between the first heat conducting member 51 and the second heat conducting member 52, and flame retardants 53 are provided at at least two of the angles. The first heat conducting member 51 is perpendicular to the second heat conducting member 52, and the connection position between the second heat conducting member 52 and the first heat conducting member 51 is the middle of the first heat conducting member 51. The angle and the hot-melt barrier 54 together form one of a chamfered structure or an arc structure.

[0181] By adding the flame retardant 53 to the heat conducting device 50, the natural phenomenon of the bare battery core in the battery cell 20 can be prevented from occurring and burning, thereby making the battery cell 20 less likely to spontaneously combust, thereby improving the safety effect.

[0182] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A battery cell, characterized in that: The battery cell comprises at least two bare cells, a housing and a heat conducting device, wherein the heat conducting device comprises: a first heat conducting member; A second heat-conducting member connected to the first heat-conducting member, and an angle is formed between the first heat-conducting member and the second heat-conducting member; A flame retardant is disposed in the angle; The bare battery core and the heat conducting device are arranged in the shell, and the second heat conducting member is arranged between the two bare battery cores.

2. The battery cell according to claim 1, characterized in that: The number of the first heat-conducting member is one, one end of the second heat-conducting member is connected to the middle part of the first heat-conducting member, and the first heat-conducting member is in contact with the same side of the two bare battery cells.

3. The battery cell according to claim 1, characterized in that: There are two first heat conductive members, which are respectively located on opposite sides of the second heat conductive member, and the two first heat conductive members respectively contact different sides of the two bare battery cells, or one of the two first heat conductive members contacts the first side of the two bare battery cells, and the other first heat conductive member contacts the second side of the two bare battery cells, and the first side of the bare battery cell is arranged opposite to the second side of the bare battery cell.

4. The battery cell according to any one of claims 1 to 3, characterized in that: The first heat conducting member contacts the housing.

5. The battery cell according to any one of claims 1 to 3, characterized in that: The first heat conducting member is spaced apart from the shell.

6. The battery cell according to any one of claims 1 to 3, characterized in that: The heat-conducting device further comprises a hot-melt insulation layer, which is arranged at the angle, connects the first heat-conducting member and the second heat-conducting member, and cooperates with the first heat-conducting member and the second heat-conducting member to form an accommodation space at the angle; The flame retardant is arranged in the accommodating space.

7. The battery cell according to any one of claims 1 to 3, characterized in that: The heat-conducting device further comprises a hot-melt insulation layer, the flame retardant is wrapped by the hot-melt insulation layer, and the hot-melt insulation layer is arranged at the angle.

8. The battery cell according to claim 6, characterized in that: The melting temperature of the hot-melt barrier is not less than 80°C and not more than 150°C.

9. The battery cell according to claim 6, characterized in that: The melting temperature of the hot-melt barrier is not less than 100°C and not more than 120°C.

10. The battery cell according to any one of claims 1 to 3, characterized in that: There are at least two first heat-conducting members, which are respectively located on two opposite sides of the second heat-conducting member. A plurality of angles are formed between the first heat-conducting member and the second heat-conducting member, and the flame retardant is disposed at at least two of the angles.

11. The battery cell according to any one of claims 1 to 3, characterized in that: Each of the angles is one of a right angle structure, an obtuse angle structure, an acute angle structure, and an arc structure.

12. The battery cell according to claim 6, characterized in that: The included angle and the hot-melt barrier together form one of a right-angle structure, an obtuse-angle structure, an acute-angle structure, an arc structure, and a chamfered structure.

13. The battery cell according to any one of claims 1 to 3, characterized in that: There are two first heat-conducting members, and opposite ends of the second heat-conducting member are respectively connected to the middle parts of the two first heat-conducting members.

14. The battery cell according to any one of claims 1 to 3, characterized in that: The second heat conducting member is perpendicular to the first heat conducting member.

15. The battery cell according to claim 6, characterized in that: The hot-melt barrier is wax.

16. The battery cell according to claim 6, characterized in that: The hot-melt barrier is arranged close to the bare battery core.

17. The battery cell according to any one of claims 1 to 3, characterized in that: The flame retardant is a mixture of one or more of dimethyl methylphosphonate, trimethyl phosphate, triethyl phosphate and tricresyl phosphate.

18. A heat conduction device, characterized in that: The heat conducting device comprises: a first heat conducting member; A second heat-conducting member connected to the first heat-conducting member, and an angle is formed between the first heat-conducting member and the second heat-conducting member; The flame retardant is arranged in the angle.

19. The heat conducting device according to claim 18, characterized in that: The heat-conducting device further comprises a hot-melt insulation layer, which is arranged at the angle, connects the first heat-conducting member and the second heat-conducting member, and cooperates with the first heat-conducting member and the second heat-conducting member to form an accommodation space at the angle; The flame retardant is arranged in the accommodating space.

20. The heat conducting device according to claim 18, characterized in that: The heat-conducting device further comprises a hot-melt insulation layer, the flame retardant is wrapped by the hot-melt insulation layer, and the hot-melt insulation layer is arranged at the angle.

21. The heat conducting device according to claim 19 or 20, characterized in that: The melting temperature of the hot-melt barrier is not less than 80°C and not more than 150°C.

22. The heat conducting device according to claim 19 or 20, characterized in that: The melting temperature of the hot-melt barrier is not less than 100°C and not more than 120°C.

23. The heat conducting device according to any one of claims 18 to 20, characterized in that: There are at least two first heat-conducting members, which are respectively located on two opposite sides of the second heat-conducting member. A plurality of angles are formed between the first heat-conducting member and the second heat-conducting member, and the flame retardant is disposed at at least two of the angles.

24. The heat conducting device according to any one of claims 18 to 20, characterized in that: Each of the angles is one of a right angle structure, an obtuse angle structure, an acute angle structure, and an arc structure.

25. The heat conducting device according to claim 19 or 20, characterized in that: The included angle and the hot-melt barrier together form one of a right-angle structure, an obtuse-angle structure, an acute-angle structure, an arc structure, and a chamfered structure.

26. The heat conducting device according to any one of claims 18 to 20, characterized in that: There are two first heat-conducting members, and opposite ends of the second heat-conducting member are respectively connected to the middle parts of the two first heat-conducting members.

27. The heat conducting device according to any one of claims 18 to 20, characterized in that: The second heat conducting member is perpendicular to the first heat conducting member.

28. The heat conducting device according to claim 19, characterized in that: The hot-melt barrier is wax.

29. The heat conducting device according to any one of claims 18 to 20, characterized in that: The flame retardant is a mixture of one or more of dimethyl methylphosphonate, trimethyl phosphate, triethyl phosphate and tricresyl phosphate.

30. A battery, characterized in that: The battery comprises the battery cell according to any one of claims 1 to 16.

31. An electrical device, characterized in that: The electrical device comprises the battery according to claim 30, and the battery is used to supply power to the electrical device.

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