Battery device, power utilization device and energy storage device

Abstract

The utility model discloses a battery device, a power utilization device and an energy storage device.The battery device comprises at least two battery monomers, and each battery monomer comprises a shell which is provided with two side faces which are opposite in the first direction and are both perpendicular to the first direction and two large faces which are opposite in the second direction and are both perpendicular to the second direction, the end cover and the bottom plate are opposite in the third direction and are perpendicular to the third direction, the first direction, the second direction and the third direction are perpendicular pairwise, a containing cavity is formed among the two side faces, the two large faces, the bottom plate and the end cover, and the size of the large faces in the first direction is larger than that of the side faces in the second direction. At least one part of the at least two battery monomers are arranged along a first direction, a heat conduction piece is arranged between the adjacent battery monomers along the first direction, and two opposite surfaces of the heat conduction piece are respectively attached to the side surfaces of the adjacent battery monomers; and / or the side surfaces of the adjacent battery monomers in the first direction are attached to each other and / or have gaps. The method has low thermal runaway risk.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery device, a power utilization device and an energy storage device. BACKGROUND

[0002] New energy batteries are increasingly widely used in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also increasingly used in the field of energy storage and the like.

[0003] In new energy vehicles equipped with batteries, the batteries can be used to provide power in whole or in part. In the field of energy storage, the batteries can be installed in an energy storage box or directly installed at a user side. In these application scenarios, there is a situation of thermal runaway of the batteries. How to reduce the risk of thermal runaway of the batteries is one of the subjects to be studied by the industry. UTILITY MODEL CONTENT

[0004] To solve the above technical problems, the present application provides a battery device, a power utilization device and an energy storage device capable of reducing the risk of thermal runaway.

[0005] The present application is implemented through the following technical solutions.

[0006] The first aspect of the present application provides a battery device, comprising at least two battery monomers, the battery monomer comprising: an outer shell having two sides opposite along a first direction and both perpendicular to the first direction, two large faces opposite along a second direction and both perpendicular to the second direction, and an end cover and a bottom plate opposite along a third direction and both perpendicular to the third direction, the first direction, the second direction and the third direction being perpendicular to each other, the side being connected between the two large faces, the side and the large face being connected between the end cover and the bottom plate, a containing cavity being formed between the two sides, the two large faces, the bottom plate and the end cover, the dimension of the large face along the first direction being greater than the dimension of the side along the second direction; at least one electrode assembly contained in the containing cavity; wherein at least a part of the at least two battery monomers is arranged along the first direction, a heat conducting member is arranged between the battery monomers adjacent along the first direction, two opposite surfaces of the heat conducting member being respectively fitted with the sides of the adjacent battery monomers; and / or, the sides of the battery monomers adjacent along the first direction are fitted; and / or, a gap is formed between the sides of the battery monomers adjacent along the first direction.

[0007] The battery device provided by the embodiments of the present application can promote the heat transfer from the battery cell to the adjacent battery cell through the side surface, promote the heat dissipation, reduce the temperature of the battery cell as soon as possible, accelerate the temperature control of the battery cell, reduce the risk of thermal runaway of the battery cell, and further reduce the risk of thermal runaway of the battery device.

[0008] In some embodiments, a heat-conducting member is arranged between the battery cells adjacent in the first direction, and the heat-conducting coefficient of the heat-conducting member is not less than 1 W / m.K.

[0009] By limiting the heat-conducting coefficient of the heat-conducting member to be not less than 2 W / m.K, the heat-conducting member has a relatively high heat-conducting coefficient, can well play a heat-conducting role, thereby improving the heat dissipation effect of the battery cell, and further reducing the risk of thermal runaway of the battery device.

[0010] In some embodiments, the heat-conducting member comprises a heat-conducting insulating pad.

[0011] The heat-conducting insulating pad is a sheet-shaped material having both heat-conducting performance and insulation performance, can promote the heat dissipation of the battery cell, and can also play an insulation role between the adjacent battery cells, reduce the probability of internal short circuit caused by poor insulation in the battery device, and further reduce the probability of thermal runaway caused by short circuit.

[0012] In some embodiments, the thickness of the heat-conducting insulating pad is not greater than 5 mm.

[0013] By limiting the thickness of the heat-conducting insulating pad to be not greater than 5 mm, the heat-conducting insulating pad has a relatively small thickness, thereby reducing the space occupied by the heat-conducting insulating pad in the first direction, and further improving the volume energy density of the battery device on the basis of improving the heat dissipation effect.

[0014] In some embodiments, the thickness of the heat-conducting insulating pad is 0.2 mm to 5 mm.

[0015] The smaller the thickness of the heat-conducting insulating pad, the better the heat-conducting performance and the worse the insulation performance of the heat-conducting insulating pad. Therefore, by limiting the thickness of the heat-conducting insulating pad to be 0.2 mm to 5 mm, the heat-conducting insulating pad has both sufficient heat-conducting performance and sufficient insulation performance, and occupies a relatively small space in the first direction, thereby reducing the risk of thermal runaway and further improving the volume energy density of the battery device.

[0016] In some embodiments, the at least two battery cells include at least two cell columns arranged along the first direction, each of the cell columns includes at least two battery cells arranged along the second direction, and the at least two battery cells in the same cell column are connected in series along the second direction by a first conductive member, and the at least two cell columns are connected in series along the first direction by a second conductive member.

[0017] In this way, the plurality of battery cells are connected in series to form a battery cell assembly with a large capacity, thereby improving the capacity of the battery device. Moreover, the battery cells adjacent along the first direction are well insulated due to the arrangement of the thermally conductive and insulating pad, thereby reducing the risk of thermal runaway.

[0018] In some embodiments, the at least two battery cells include at least two cell rows arranged along the second direction, each of the cell rows includes at least two battery cells arranged along the first direction, and the at least two battery cells in the same cell row are connected in series along the first direction by a third conductive member, and the at least two cell rows are connected in series along the second direction by a fourth conductive member.

[0019] In this way, the plurality of battery cells are connected in series to form a battery cell assembly with a large capacity, thereby improving the capacity of the battery device. Moreover, the battery cells adjacent along the first direction are well insulated due to the arrangement of the thermally conductive and insulating pad, and the arrangement also reduces the pressure difference between the battery cells adjacent along the first direction, thereby further reducing the risk of thermal runaway.

[0020] In some embodiments, the battery device further includes a thermally conductive member arranged between the battery cells adjacent along the first direction.

[0021] In this way, the thermally conductive member does not exceed the side surface in the plane perpendicular to the first direction, and the space occupied by the thermally conductive member is not increased, thereby facilitating the improvement of the volumetric energy density of the battery device.

[0022] In some embodiments, the thermally conductive member includes at least one of a thermally conductive silicone rubber layer, a graphene layer, a graphite layer, a carbon nanotube layer, a silicon carbide layer, a thermally conductive plastic layer, a thermally conductive plastic layer, a thermally conductive rubber layer, a thermally conductive silicone layer, and a metal layer.

[0023] The material layer can play a good heat conduction role, thereby promoting heat dissipation, reducing the temperature of the heated battery cell to a suitable temperature as soon as possible, accelerating the temperature control of the heated battery cell, reducing the risk of thermal runaway of the battery cell, and further reducing the risk of thermal runaway of the battery device.

[0024] In some embodiments, a surface of the heat conduction member facing the side surface is provided with an adhesive layer, and the heat conduction member is adhered to the side surface through the adhesive layer.

[0025] The heat conduction member is adhered to the side surface through the adhesive layer, thereby improving the stability of the heat conduction member and enabling the heat conduction member to play a more sufficient heat dissipation role.

[0026] In some embodiments, the side surfaces of the battery cells adjacent in the first direction are adhered through an adhesive layer.

[0027] In this way, the adjacent battery cells are adhered through the adhesive layer, thereby improving the firmness of the adhesion of the adjacent battery cells and enabling the heat dissipation effect to be better played.

[0028] In some embodiments, the at least two battery cells include at least two cell rows arranged along the second direction, each of the cell rows includes at least two battery cells arranged along the first direction, and the at least two battery cells in the same cell row are sequentially connected in series along the first direction through a third conductive member, and the at least two cell rows are sequentially connected in series along the second direction through a fourth conductive member.

[0029] In this way, the plurality of battery cells are connected in series to form a battery cell assembly with a larger capacity, thereby improving the capacity of the battery device. Furthermore, in this way, the pressure difference between the battery cells adjacent in the first direction is reduced, thereby reducing the risk of thermal runaway between the battery cells adjacent in the first direction.

[0030] In some embodiments, the adhesive layer is made of heat-conductive glue.

[0031] In this way, the heat-conductive glue is used for adhesion, which not only realizes the adhesion function but also facilitates heat conduction, thereby further improving the heat dissipation effect.

[0032] In some embodiments, the heat-conductive glue includes any one of organic silicon heat-conductive glue, epoxy resin heat-conductive glue, polyurethane glue, and heat-conductive silicone grease.

[0033] The glue material not only realizes the adhesion function but also facilitates heat conduction, thereby further improving the heat dissipation effect.

[0034] In some embodiments, a gap is formed between the side surfaces of the battery cells adjacent in the first direction, and a dimension of the gap in the first direction is in a range of 0.2 mm to 5 mm.

[0035] In this way, by limiting the gap between the side surfaces of adjacent battery cells to a range of 0.2 mm to 5 mm, heat transfer from the battery cells to adjacent battery cells through the side surfaces is facilitated, while the volumetric energy density of the battery device is not affected by the gap being too large.

[0036] In some embodiments, the electrode assembly is a jelly-roll structure wound from a laminate including positive electrode sheets and negative electrode sheets, the jelly-roll structure including a flat portion and bent portions provided at both ends of the flat portion in a first direction, and a stacking direction of the positive electrode sheets and negative electrode sheets of the flat portion is consistent with the second direction.

[0037] With the above arrangement, the bent portions are close to the side surfaces of the case, and a relatively large space is formed between the bent portions and the corners between the side surfaces and the large surfaces. In this way, when heat transferred from the side surfaces of the case is transferred to the electrode assembly, the rate of transfer is relatively slow and the amount of heat transferred is relatively small due to the presence of the relatively large space, so the effect on the electrode assembly is relatively small, and the effect on the performance of adjacent battery cells is inhibited.

[0038] In some embodiments, the electrode assembly is a laminated structure including positive electrode sheets and negative electrode sheets alternately stacked in the second direction.

[0039] In this way, the area of the electrode assembly facing the side surfaces is smaller than the area facing the large surfaces, so when heat transferred from the side surfaces is transferred to the electrode assembly, the rate of transfer is relatively slow and the amount of heat transferred is relatively small due to the small area of the electrode assembly facing the side surfaces, so the effect on the electrode assembly is relatively small, and the effect on the performance of adjacent battery cells is inhibited.

[0040] In some embodiments, at least a portion of the at least two battery cells is arranged along the second direction, and a buffer pad is arranged between the large surfaces of adjacent battery cells in the second direction, the buffer pad being used to alleviate expansion of the large surfaces.

[0041] When the temperature of the battery cells changes, the large surfaces of the case are prone to expand and deform. In order to inhibit the degree of deformation of the large surfaces, a buffer pad is provided, and the degree of deformation of the large surfaces is inhibited by the buffer pad, which is beneficial to reducing the impact of deformation of the large surfaces on the performance of the battery cells.

[0042] In some embodiments, the buffer pad is provided with an avoidance opening that penetrates the buffer pad along the second direction, and the avoidance opening is arranged opposite the center of the large surface in the second direction.

[0043] In this way, the buffer pad is arranged between the large faces of the battery cells adjacent in the second direction, so as to inhibit the outward expansion of the large faces, and by arranging the avoiding opening, the large faces are allowed to expand to a certain extent, so as to relieve the pressure in the shell, maintain the stability of the structure in the accommodation cavity, and prolong the service life of the battery cell.

[0044] In some embodiments, the buffer pad comprises two first edges opposite in the third direction and extending along the first direction, and two second edges opposite in the first direction and extending along the third direction, two ends of the first edges are connected to the two second edges respectively, and the avoiding opening is formed between the two first edges and the two second edges.

[0045] In this way, the buffer pad with the avoiding opening is formed, so as to realize the relieving effect on the expansion of the large face, and facilitate to reduce the influence of the deformation of the large face on the performance of the battery cell.

[0046] In some embodiments, the material of the first edge comprises porous foam material and / or hard rubber; and / or, the material of the second edge comprises porous foam material and / or hard rubber.

[0047] In this way, the buffer pad formed has the relieving effect on the expansion of the large face, and facilitates to reduce the influence of the deformation of the large face on the performance of the battery cell.

[0048] In some embodiments, the material of the first edge and / or the second edge comprises porous foam material, and the porous foam material comprises any one of microporous polypropylene foam, polyurethane foam, polystyrene foam, and polyethylene foam.

[0049] The first edge and / or the second edge made of the above-mentioned material have certain supporting performance and certain elastic performance, can better play a relieving effect on the expansion of the large face, and are more conducive to reducing the influence of the deformation of the large face on the performance of the battery cell.

[0050] In some embodiments, the buffer pad comprises a thermal insulation pad.

[0051] In this way, the large faces of the battery cells are thermally insulated by the thermal insulation pad, so as to reduce the heat transferred through the large faces and reduce the influence on the battery cells adjacent in the second direction.

[0052] In some embodiments, the thermal insulation pad is an aerogel thermal insulation pad or a foam thermal insulation pad.

[0053] Both the aerogel thermal insulation pad and the foam thermal insulation pad have heat insulation performance and elastic performance, can well play a role in insulating heat, and can also well play a role in relieving the expansion of the large face.

[0054] In some embodiments, the electrode assembly comprises positive electrode sheets and negative electrode sheets which are alternately stacked, the positive electrode sheet comprises a positive electrode current collector and a positive electrode active material layer arranged on both surfaces of the positive electrode current collector, and the active material of the positive electrode active material layer comprises lithium-containing phosphate; the negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer arranged on both surfaces of the negative electrode current collector, and the active material of the negative electrode active material layer comprises graphite.

[0055] In this way, the battery monomer does not have too high a heating temperature in the case of temperature rise, can effectively dissipate heat through heat transfer in the first direction, thereby well reducing the risk of thermal runaway of the battery monomer, and further reducing the risk of thermal runaway of the battery device.

[0056] In some embodiments, the active material of the positive electrode active material layer comprises lithium iron phosphate, and the active material of the negative electrode active material layer comprises artificial graphite.

[0057] In this way, the battery monomer is a lithium iron phosphate battery, and the battery monomer does not have too high a heating temperature in the case of temperature rise, can effectively dissipate heat through heat transfer in the first direction, thereby well reducing the risk of thermal runaway of the battery monomer, and further reducing the risk of thermal runaway of the battery device.

[0058] In some embodiments, the side of the bottom plate of the at least two battery monomers away from the accommodating cavity is provided with a heat exchange plate.

[0059] In this way, the heat exchange plate can exchange heat with the bottom plate of the battery monomer, promote heat dissipation from the bottom plate, further reduce the risk of thermal runaway of the battery monomer, and thereby reduce the risk of thermal runaway of the battery device.

[0060] In some embodiments, the heat exchange plate is a hollow and flat liquid cooling plate, and a cooling liquid flows in the hollow inner cavity of the liquid cooling plate.

[0061] In this way, heat dissipation of the battery monomer can be promoted, and the flat structure of the heat exchange plate can reduce the occupation of space and improve the volume energy density of the battery device.

[0062] The second aspect of the present application provides a power utilization device, which comprises the battery device of the first aspect for providing electric energy.

[0063] Since the power utilization device comprises the above-mentioned battery device, the battery device has a low risk of thermal runaway, and thus the power utilization device has a low risk of thermal runaway.

[0064] The third aspect of the present application provides an energy storage device, which comprises a plurality of battery devices of the first aspect for storing or providing electric energy.

[0065] Since the energy storage device includes the battery device described above, the energy storage device has all the beneficial effects of the battery device, and thus the energy storage device has a low risk of thermal runaway.

[0066] Practical new type effect

[0067] Through the present application, a battery device, an electric device and an energy storage device capable of reducing the risk of thermal runaway are provided. BRIEF DESCRIPTION OF DRAWINGS

[0068] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The detailed description is merely meant to teach a person of ordinary skill a way to make and use the application. It is not meant to put limitations on the scope of the application. And throughout the drawings, like reference numerals are used to refer to the same or similar components. In the drawings:

[0069] Figure 1 A structural schematic diagram of a vehicle provided for some embodiments of the present application;

[0070] Figure 2 A perspective exploded schematic diagram of a battery device provided for some embodiments of the present application;

[0071] Figure 3 A perspective exploded schematic diagram of a battery cell provided for some embodiments of the present application;

[0072] Figure 4 A partial perspective schematic diagram of a first structure of a battery device provided for some embodiments of the present application;

[0073] Figure 5 A top view of a second structure of a battery device provided for some embodiments of the present application;

[0074] Figure 6 A top view of a third structure of a battery device provided for some embodiments of the present application;

[0075] Figure 7 A top view of a fourth structure of a battery device provided for some embodiments of the present application;

[0076] Figure 8 A cross-sectional view of two adjacent battery cells provided for some embodiments of the present application Figure 1 ;

[0077] Figure 9 A cross-sectional view of two adjacent battery cells provided for some embodiments of the present application Figure 2 ;

[0078] Figure 10 A structural schematic diagram of a buffer pad provided for some embodiments of the present application;

[0079] Figure 11 A front view of a partial structure of a battery device provided for some embodiments of the present application.

[0080] Legend of reference numerals

[0081] 1000 vehicle; 100 battery device; 200 controller; 300 motor; 10 case; 101 first case; 102 second case; 1 battery cell; 1a cell row; 1b cell column; 11 housing; 111 side surface; 112 large surface; 113 bottom plate; 114 end cover; 115 shell; 12 electrode assembly; 120 tab; 121 flat portion; 122 bent portion; 13 pole; 13a, positive pole; 13b, negative pole; 14 pressure relief mechanism; 3 heat conducting member; 3a heat conducting insulating pad; 41 first conductive member; 42 second conductive member; 43 third conductive member; 44 fourth conductive member; 5 buffer pad; 5a heat insulation pad; 51 avoidance opening; 52 first edge; 53 second edge; 6 heat exchange plate. DETAILED DESCRIPTION

[0082] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0083] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "include" and "have" and any variations thereof used in the specification and the above drawings description are intended to cover the case where one or more features are included or have.

[0084] In the description of the embodiments of the present application, the technical terms "first", "second", "third" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly and specifically limited.

[0085] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily mutually exclusive or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0086] In the description of the embodiments of the present application, the term "and / or" is merely an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A existing alone, A and B existing together, and B existing alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0087] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", and the like are based on the orientations or positional relationships shown in the drawings, and are merely for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed, operated or used in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0088] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing", and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or can be integrated; can be mechanical connection, or can be electrical connection; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0089] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical term "contact" should be understood in a broad sense, which can be direct contact or contact through an intermediate medium layer, and can be contact between two objects in contact without interaction force, or contact between two objects in contact with interaction force.

[0090] The present application will be described in detail below.

[0091] At present, new energy batteries are more and more widely used in life and industry. New energy batteries are not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also increasing.

[0092] In the embodiments of the present application, the battery device includes a plurality of battery monomers (also referred to as battery cells).

[0093] In the embodiments of the present application, the plurality refers to two or more.

[0094] Currently, in some battery apparatuses, in order to reduce the mutual influence of the temperature between the battery cells, the battery cells and the battery cells around them are blocked by heat insulation pads to prevent heat transfer. The present inventor has found that, with such an arrangement, the heated battery cell cannot be effectively cooled, causing the temperature of the battery cell to rise rapidly or continue to heat, thereby easily causing thermal runaway, and further causing the entire battery apparatus to be in thermal runaway, and even increasing the risk of fire or explosion of the battery apparatus.

[0095] The present inventor has found that, by promoting the heat of the battery cell to be dissipated from its side to the adjacent battery cell, and allowing the adjacent battery cell to share a portion of the heat, the heated battery cell can be quickly reduced to an appropriate temperature, thereby accelerating the temperature control of the heated battery cell, thereby reducing the risk of thermal runaway of the battery cell, and further reducing the risk of thermal runaway of the battery apparatus.

[0096] Based on such a design concept, the present inventor has designed a battery apparatus, which includes at least two battery cells, each battery cell including a housing and at least one electrode assembly, the housing having two sides opposite along a first direction and each perpendicular to the first direction, two large faces opposite along a second direction and each perpendicular to the second direction, and an end cover and a bottom plate opposite along a third direction and each perpendicular to the third direction, the first direction, the second direction and the third direction being perpendicular to each other, the side being connected between the two large faces, the side and the large face being connected between the end cover and the bottom plate, the two sides, the two large faces, the bottom plate and the end cover forming a containing cavity, the dimension of the large face along the first direction being greater than the dimension of the side along the second direction; the at least one electrode assembly being contained in the containing cavity; at least a portion of the at least two battery cells being arranged along the first direction, a heat conducting member being provided between the battery cells adjacent along the first direction, two opposite surfaces of the heat conducting member being respectively fitted with the sides of the adjacent battery cells; and / or, the sides of the battery cells adjacent along the first direction being fitted, and / or, forming a gap between the sides of the battery cells adjacent along the first direction.

[0097] The present design cancels the heat insulation pad or replaces the heat insulation pad with a heat conducting pad, which can promote the heat of the battery cell to be transferred to the battery cell adjacent along the first direction through the side, promote the dissipation of heat, and facilitate the heated battery cell to be quickly reduced to an appropriate temperature, thereby accelerating the temperature control of the heated battery cell, thereby reducing the risk of thermal runaway of the battery cell, and further reducing the risk of thermal runaway of the battery apparatus.

[0098] The battery apparatus (Battery Apparatus) mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) can include a plurality of battery cells connected in series, in parallel or in a mixed manner through a busbar component.

[0099] In some embodiments, the battery cell assembly can be formed by arranging a plurality of battery cells.

[0100] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into one independent module. As an example, the battery module can be formed by bundling a plurality of battery cells by a cable tie.

[0101] In some embodiments, the battery device can be a battery pack, which includes a case and one or more battery cell assemblies accommodated in the case.

[0102] As an example, the battery cell assembly can be a battery module, which can be accommodated in the case by fixing the battery module in the case.

[0103] As an example, the battery cell assembly can also be accommodated in the case by directly fixing a plurality of battery cells in the case.

[0104] In some embodiments, the case can be part of the chassis structure of the vehicle. For example, part of the case can be at least part of the floor of the vehicle, or part of the case can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0105] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue to be used.

[0106] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited thereto.

[0107] The battery cell includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator disposed between the negative electrode and the positive electrode. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time, the active ions can pass through.

[0108] In some embodiments, the positive electrode can be a positive electrode tab, which can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0109] As an example, the positive electrode current collector has two surfaces opposite in the thickness direction thereof, and the positive electrode active material is disposed on either one or both of the two opposite surfaces of the positive electrode current collector.

[0110] As an example, the positive electrode current collector can employ a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver, and the like can be employed. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, and the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, and the like).

[0111] As an example, the positive electrode active material can include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material can also be used. These positive electrode active materials can be used alone only one or two or more can be used in combination. Among them, examples of the lithium-containing phosphate can include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (which can also be referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide can include, but are not limited to, at least one of lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (which can also be referred to as NCM333), LiNi0.5Co0.2Mn0.3O2 (which can also be referred to as NCM523), LiNi0.5Co0.25Mn0.25O2 (which can also be referred to as NCM211), LiNi0.6Co0.2Mn0.2O2 (which can also be referred to as NCM622), LiNi0.8Co0.1Mn0.1O2 (which can also be referred to as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi0.8Co0.15Al0.05O2), and modified compounds thereof. The modified compound refers to a substance obtained by a modification means such as doping or coating on the basis of the above-mentioned substance.

[0112] In some embodiments, the positive electrode can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When the foamed metal is employed as the positive electrode, the foamed metal surface can be free of positive electrode active material, or can be provided with positive electrode active material. As an example, the positive electrode active material can be filled or / and deposited in the foamed metal.

[0113] In some embodiments, the negative electrode can be a negative electrode tab, which can include a negative electrode current collector.

[0114] As an example, the negative electrode current collector can employ a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver, etc. can be employed. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0115] As an example, the negative electrode tab can include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0116] As an example, the negative electrode current collector has two opposite surfaces in the thickness direction thereof, and the negative electrode active material is provided on either one or both of the two opposite surfaces of the negative electrode current collector.

[0117] As an example, the negative electrode active material can employ a negative electrode active material known in the art for use in a battery cell. As an example, the negative electrode active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based material, tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, silicon oxide compound, silicon-carbon composite, silicon-nitrogen composite, and silicon alloy. The tin-based material can be selected from at least one of elemental tin, tin oxide compound, and tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a negative electrode active material for a battery cell can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0118] In some embodiments, the negative electrode can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When the foamed metal is employed as the negative electrode tab, the foamed metal surface can be free of negative electrode active material, or can be provided with negative electrode active material.

[0119] As an example, the negative electrode active material can be filled or / and deposited in the negative electrode current collector.

[0120] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0121] The technical solutions described in the embodiments of the present application are applicable to various power consumption devices using battery devices, for example, mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc., for example, spacecraft including airplanes, rockets, space shuttles and spaceships, etc.

[0122] The technical solutions described in the embodiments of the present application are applicable to various energy storage devices using battery devices, for example, energy storage containers or energy storage cabinets, etc.

[0123] In the following embodiments, for the convenience of description, the power consumption device of an embodiment of the present application is taken as a vehicle 1000 for example to be described. The following is described in conjunction with the accompanying drawings.

[0124] Figure 1 A structural schematic diagram of the vehicle 1000 is provided for some embodiments of the present application.

[0125] The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. As shown in the figure, Figure 1 The vehicle 1000 is provided with a battery device 100 inside, which can be arranged at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as the operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation and driving.

[0126] In some embodiments of the present application, the battery device 100 can not only be used as the operating power supply of the vehicle 1000, but also be used as the driving power supply of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0127] Figure 2 A perspective exploded schematic diagram of the battery device 100 is provided for some embodiments of the present application.

[0128] As shown in the figure, Figure 2 The battery device 100 includes a box body 10 and at least one battery monomer 1, and the box body 10 is provided with a closed space, and the at least one battery monomer 1 is accommodated in the closed space.

[0129] In some embodiments of this application, the housing 10 may include a first housing 101 and a second housing 102. The first housing 101 and the second housing 102 are fastened together, forming a closed space inside the housing 10 to accommodate the battery cell 1. Here, "closed" refers to covering or closing, and can be sealed or unsealed. The first housing 101 may be a top cover or a bottom plate.

[0130] The second box 102 can be a hollow structure with one end open, and the first box 101 can be a plate-like structure. The first box 101 covers the open side of the second box 102 so that the first box 101 and the second box 102 together define a closed space. Alternatively, the first box 101 and the second box 102 can both be hollow structures with one side open, and the open side of the first box 101 covers the open side of the second box 102. Of course, the box 10 formed by the first box 101 and the second box 102 can be of various shapes, such as a cylinder, a cuboid, etc.

[0131] In the battery device 100, there can be multiple battery cells 1, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 1 are connected in both series and parallel configurations. Multiple battery cells 1 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of multiple battery cells 1 is placed in the enclosed space formed by the second housing 102 and the first housing 101. Alternatively, the battery device 100 can also consist of multiple battery cells 1 first connected in series, parallel, or in a mixed manner to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is then housed within the enclosed space formed by the second housing 102 and the first housing 101. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between multiple battery cells 1.

[0132] Below, refer to Figures 3 to 11 Some embodiments of this application will be described in detail.

[0133] Figure 3 An exploded perspective view of a battery cell provided for some embodiments of this application; Figure 4 A partial perspective view of a first structure of a battery device provided for some embodiments of this application; Figure 5 A top view of a second structure of a battery device provided for some embodiments of this application; Figure 6 A top view of a third structure of a battery device provided for some embodiments of this application; Figure 7 A top view of a fourth structure of a battery device provided for some embodiments of this application; Figure 8 Cross-sectional view of two adjacent battery cells provided for some embodiments of this application Figure 1 ; Figure 9A cross-sectional view of two adjacent battery cells provided for some embodiments of the present application Figure 2 ; Figure 10 A structural schematic view of a cushion provided for some embodiments of the present application Figure 11 A front view of a partial structure of a battery device provided for some embodiments of the present application

[0134] For the convenience of illustration, as shown by the arrows in Figures 3 to 10 , the direction of arrow X is the first direction, the direction of arrow Y is the second direction, and the direction of arrow Z is the third direction, the first direction X, the second direction Y and the third direction Z are perpendicular to each other in pairs.

[0135] Please refer to Figures 3 to 5 , the first aspect of the present application provides a battery device 100, the battery device 100 comprises at least two battery cells 1, the battery cell 1 comprises an outer shell 11 and at least one electrode assembly 12, the outer shell 11 has two side surfaces 111 opposite to each other along the first direction X and both perpendicular to the first direction X, two large surfaces 112 opposite to each other along the second direction Y and both perpendicular to the second direction Y, and an end cover 114 and a bottom plate 113 opposite to each other along the third direction Z and both perpendicular to the third direction Z, the first direction X, the second direction Y and the third direction Z are perpendicular to each other in pairs, the side surface 111 is connected between the two large surfaces 112, and the side surface 111 and the large surface 112 are both connected between the end cover 114 and the bottom plate 113, the two side surfaces 111, the two large surfaces 112, the bottom plate 113 and the end cover 114 form a containing cavity, and the dimension of the large surface 112 along the first direction X is greater than the dimension of the side surface 111 along the second direction Y; the at least one electrode assembly 12 is contained in the containing cavity; at least a part of the at least two battery cells 1 is arranged along the first direction X, and a heat conduction member 3 is arranged between the battery cells 1 adjacent along the first direction X, two opposite surfaces of the heat conduction member 3 are respectively fitted with the side surfaces 111 of the adjacent battery cells 1; and / or, the side surfaces 111 of the battery cells 1 adjacent along the first direction X are fitted with each other, and / or, a gap is formed between the side surfaces of the battery cells adjacent along the first direction X.

[0136] The outer shell 11 is a component having a containing cavity isolated from the external environment, and the containing cavity is used to contain the electrode assembly 12, the electrolyte and other components. The material of the outer shell 11 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereon.

[0137] The electrode assembly 12 is a component in which electrochemical reactions occur in the battery cell 1. Two or more electrode assemblies 12 can be contained within the case 11. The electrode assembly 12 is mainly formed by winding or layering a positive electrode tab and a negative electrode tab, and an insulator is generally provided between the positive electrode tab and the negative electrode tab. The positive electrode tab and the negative electrode tab have portions with active materials that constitute a main body of the electrode assembly 12, and portions without active materials that each constitute a tab 120. The positive electrode tab and the negative electrode tab can be collectively located at one end of the main body or respectively located at both ends of the main body. During charging and discharging of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 120 is connected to the terminal 13 to form a current loop.

[0138] As shown in the example, Figure 3 The case 11 is provided with at least one terminal 13 that is electrically connected to the tab 120. The terminal 13 can be directly connected to the tab 120 or indirectly connected to the tab 120 through an adapter component. The terminal 13 can be provided on the end cover 114 or on the bottom plate 113 or the large face 112.

[0139] As shown in the example, the battery device 100 has a heat conduction component 3 between adjacent battery cells 1 in the first direction X. As shown in the example, the side faces 111 of adjacent battery cells 1 in the first direction X of the battery device 100 are in contact with each other. As shown in the example, the battery device 100 has a heat conduction component 3 between some adjacent battery cells 1 in the first direction X, and the side faces 111 of other adjacent battery cells 1 in the first direction X are in contact with each other.

[0140] The gap between the side faces 111 of adjacent battery cells 1 in the first direction X refers to a region between the side faces 111 that is not occupied by an object.

[0141] In the battery device 100 provided by the embodiments of the present application, the heat conduction component 3 is arranged between adjacent battery cells 1 in the first direction X, or the side faces 111 of adjacent battery cells 1 are in contact with each other, or a gap is formed between the side faces 111 of adjacent battery cells 1, which can promote the heat of a battery cell 1 to be transferred to an adjacent battery cell 1 through the side face 111, promote heat dissipation, and facilitate the temperature of a heated battery cell 1 to be reduced to a suitable temperature as soon as possible, thereby accelerating the temperature control of the heated battery cell 1, reducing the risk of thermal runaway of the battery cell 1, and further reducing the risk of thermal runaway of the battery device 100.

[0142] In some embodiments of the present application, as shown in the example, Figure 3As shown, the two large faces 112, the two side faces 111 and the bottom plate 113 form an integral structure of the shell 115, and the end cover 114 covers the opening of the shell 115 to seal the internal environment of the battery monomer 1 from the external environment. Without limitation, the shape of the end cover 114 can be adapted to the shape of the shell 115 to fit the shell 115. Alternatively, the end cover 114 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover 114 is not easily deformed when subjected to extrusion and collision, so that the battery monomer 1 can have higher structural strength and safety performance can also be improved. The pole 13 is provided on the end cover 114 and electrically connected to the electrode assembly 12 for outputting or inputting the electrical energy of the battery monomer 1.

[0143] In some embodiments of the present application, the end cover 114 can also be provided with a pressure relief mechanism 14 for relieving the internal pressure when the internal pressure or temperature of the battery monomer 1 reaches a threshold value. The material of the end cover 114 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not have special restrictions. In some embodiments of the present application, an insulating member can also be provided on the inside of the end cover 114, which can be used to isolate the electrical connection components in the shell 115 from the end cover 114 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0144] The shell 115 is a component for fitting the end cover 114 to form the internal environment of the battery monomer 1, wherein the formed internal environment can be used to accommodate the electrode assembly 12, the electrolyte and other components. The shell 115 and the end cover 114 can be independent components, and an opening can be provided on the shell 115, and the end cover 114 is covered on the opening to form the internal environment of the battery monomer 1. Without limitation, the end cover 114 and the shell 115 can also be integrated, specifically, the end cover 114 and the shell 115 can form a common connecting surface before other components enter the shell, and when it is necessary to seal the inside of the shell 115, the end cover 114 is covered on the shell 115. The material of the shell 115 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not have special restrictions.

[0145] In some embodiments of the present application, the two adjacent electrode assemblies 12 can be connected in series or in parallel or in mixed connection, and the mixed connection means that at least two electrode assemblies 12 have both series connection and parallel connection. At least two electrode assemblies 12 can be directly connected in series or in parallel or in mixed connection, and the whole of at least two battery monomers 1 is placed in the accommodating cavity formed by the end cover 114 and the shell 115.

[0146] In some embodiments of the present application, as shown in FIG. 2, the two adjacent electrode assemblies 12 can be connected in series or in parallel or in mixed connection, and the mixed connection means that at least two electrode assemblies 12 have both series connection and parallel connection. At least two electrode assemblies 12 can be directly connected in series or in parallel or in mixed connection, and the whole of at least two battery monomers 1 is placed in the accommodating cavity formed by the end cover 114 and the shell 115. Figure 4As shown, a heat-conducting member 3 is arranged between the battery monomers 1 adjacent in the first direction X, and the heat-conducting coefficient of the heat-conducting member 3 is not less than 1 W / m.K.

[0147] For example, the heat-conducting coefficient of the heat-conducting member 3 can be, but is not limited to, 1 W / m.K, 2 W / m.K, 3 W / m.K, 4 W / m.K, 5 W / m.K, 6 W / m.K, 7 W / m.K, 8 W / m.K, 9 W / m.K, or 10 W / m.K.

[0148] By limiting the heat-conducting coefficient of the heat-conducting member 3 to not less than 1 W / m.K, the heat-conducting coefficient of the heat-conducting member 3 is relatively high, which can well play a heat-conducting role, thereby improving the heat dissipation effect of the battery monomer 1 and further reducing the risk of thermal runaway of the battery device 100.

[0149] In some embodiments of the present application, as shown in Figure 4 As shown, a heat-conducting member 3 is arranged between the battery monomers 1 adjacent in the first direction X, and the heat-conducting coefficient of the heat-conducting member 3 is 2.7 W / m.K to 5 W / m.K.

[0150] For example, the heat-conducting coefficient of the heat-conducting member 3 can be, but is not limited to, 2.7 W / m.K, 2.8 W / m.K, 2.9 W / m.K, 3 W / m.K, 3.1 W / m.K, 3.2 W / m.K, 3.3 W / m.K, 3.4 W / m.K, 3.5 W / m.K, 3.6 W / m.K, 3.7 W / m.K, 3.8 W / m.K, 3.9 W / m.K, 4 W / m.K, 4.1 W / m.K, 4.2 W / m.K, 4.3 W / m.K, 4.4 W / m.K, 4.5 W / m.K, 4.6 W / m.K, 4.7 W / m.K, 4.8 W / m.K, 4.9 W / m.K, or 5 W / m.K.

[0151] By limiting the heat-conducting coefficient of the heat-conducting member 3 to 2.7 W / m.K to 5 W / m.K, the heat-conducting coefficient of the heat-conducting member 3 is relatively high, which can well play a heat-conducting role, thereby improving the heat dissipation effect of the battery monomer 1 and further reducing the risk of thermal runaway of the battery device 100.

[0152] In some embodiments of the present application, the heat-conducting member 3 comprises a heat-conducting insulating pad 3a.

[0153] The heat-conducting insulating pad is a sheet-shaped material with both heat-conducting and insulating properties, which can not only promote heat dissipation of the battery monomer 1, but also play an insulating role between adjacent battery monomers 1, thereby reducing the probability of internal short circuit caused by poor insulation in the battery device 100 and further reducing the probability of thermal runaway caused by short circuit.

[0154] In some embodiments of the present application, the thickness of the heat-conducting insulating pad 3a is not greater than 5 mm.

[0155] Exemplarily, the thickness of the thermally conductive insulating pad 3a can be, but is not limited to, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm.

[0156] By limiting the thickness of the thermally conductive insulating pad 3a to a range of no more than 5 mm, the thickness of the thermally conductive insulating pad 3a is relatively thin, thereby reducing the space occupied by the thermally conductive insulating pad 3a in the first direction X, thereby improving the volumetric energy density of the battery device 100 on the basis of improving the heat dissipation effect.

[0157] In some embodiments of the present application, the thickness of the thermally conductive insulating pad 3a is 0.2 mm to 5 mm.

[0158] Exemplarily, the thickness of the thermally conductive insulating pad 3a can be, but is not limited to, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.05 mm, 1.1 mm, 1.15 mm, 1.2 mm, 1.25 mm, 1.3 mm, 1.35 mm, 1.4 mm, 1.45 mm, 1.5 mm, 1.55 mm, 1.6 mm, 1.65 mm, 1.7 mm, 1.75 mm, 1.8 mm, 1.85 mm, 1.9 mm, 1.95 mm, 2 mm, 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm, 5 mm.

[0159] The smaller the thickness of the thermally conductive insulating pad 3a, the better the thermal conductivity of the thermally conductive insulating pad 3a and the worse the insulation, therefore, by limiting the thickness of the thermally conductive insulating pad 3a to a range of 0.2 mm to 5 mm, the thermally conductive insulating pad 3a has both sufficient thermal conductivity and sufficient insulation, and also occupies relatively small space in the first direction X, thereby reducing the risk of thermal runaway and also improving the volumetric energy density of the battery device 100.

[0160] In some embodiments of the present application, as shown in Figure 4 At least two battery monomers 1 include at least two monomer columns 1a arranged along the first direction X, each monomer column 1a includes at least two battery monomers 1 arranged along the second direction Y, in the same monomer column 1a, the at least two battery monomers 1 are sequentially connected in series along the second direction Y through the first conductive member 41, and the at least two monomer columns 1a are sequentially connected in series along the first direction X through the second conductive member 42. The thermally conductive insulating pad 3a is arranged between the battery monomers 1 adjacent to each other along the first direction X.

[0161] The first conductive member 41 and the second conductive member 42 are components with conductive properties, and can be in the shape of a long strip of sheet material, and can be made of, but are not limited to, copper, aluminum, nickel-chromium alloy, copper-nickel alloy, etc.

[0162] Specifically, referring to Figure 4 , each of the end covers 114 of the battery cells 1 is provided with one positive pole 13a and one negative pole 13b, and the two poles are spaced apart along the first direction X. Figure 4 In the first direction X, the first cell column 1a, the second cell column 1a, and the third cell column 1a are arranged in sequence, in the first cell column 1a, along the direction opposite to the direction indicated by the arrow of the second direction Y, the negative pole 13b of the previous battery cell 1 is electrically connected to the positive pole 13a of the next battery cell 1 through the first conductive member 41, the negative pole 13b of the last battery cell 1 in the first cell column 1a is electrically connected to the positive pole 13a of the first battery cell 1 in the second cell column 1a along the direction indicated by the arrow of the second direction Y through the second conductive member 42, in the second cell column 1a, along the direction indicated by the arrow of the second direction Y, the negative pole 13b of the previous battery cell 1 is electrically connected to the positive pole 13a of the next battery cell 1 through the first conductive member 41, the negative pole 13b of the last battery cell 1 in the second cell column 1a is electrically connected to the positive pole 13a of the first battery cell 1 in the third cell column 1a along the direction opposite to the direction indicated by the arrow of the second direction Y through the second conductive member 42, in the third cell column 1a, along the direction opposite to the direction indicated by the arrow of the second direction Y, the negative pole 13b of the previous battery cell 1 is electrically connected to the positive pole 13a of the next battery cell 1 through the first conductive member 41. In this way, in the same cell column 1a, at least two battery cells 1 are connected in series along the second direction Y through the first conductive member 41, and at least two cell columns 1a are connected in series along the first direction X through the second conductive member 42.

[0163] More specifically, the positions of the positive pole 13a and the negative pole 13b of two adjacent battery cells 1 along the second direction Y are reversed on the end cover 114, so that the extension direction of the first conductive member 41 is consistent with the second direction Y. The positions of the positive pole 13a and the negative pole 13b of two adjacent battery cells 1 along the first direction X are the same on the end cover 114, so that the extension direction of the second conductive member 42 is consistent with the first direction X.

[0164] In this way, the plurality of battery cells 1 are connected in series to form a battery cell assembly with large capacity, thereby improving the capacity of the battery device 100. Moreover, the battery cells 1 adjacent along the first direction X have good insulation effect due to the arrangement of the thermally conductive insulating pads 3a, thereby reducing the risk of sparking between the adjacent cell columns 1a and further reducing the risk of thermal runaway.

[0165] In some embodiments of the present application, as shown in Figure 6 at least two battery cells 1 include at least two cell rows 1b arranged along the second direction Y, each cell row 1b includes at least two battery cells 1 arranged along the first direction X, and the at least two battery cells 1 in the same cell row 1b are connected in series along the first direction X by a third conductive member 43, and the at least two cell rows 1b are connected in series along the second direction Y by a fourth conductive member 44. The thermally conductive insulating pads 3a are arranged between the battery cells 1 adjacent along the first direction X.

[0166] The third conductive member 43 and the fourth conductive member 44 are components with conductive properties, which can be a long strip-shaped sheet, and the material can be, but is not limited to, copper, aluminum, nickel-chromium alloy, copper-nickel alloy, etc.

[0167] Specifically, referring to Figure 3 each end cover 114 of each battery cell 1 is provided with a positive pole 13a and a negative pole 13b, and the two poles are spaced apart along the first direction X, referring to Figure 6, the first cell row 1b, the second cell row 1b, the third cell row 1b, the fourth cell row 1b and the fifth cell row 1b are arranged in sequence along the direction indicated by the arrow of the second direction Y, in the first cell row 1b, the negative electrode pole 13b of the former battery cell 1 is electrically connected to the positive electrode pole 13a of the latter battery cell 1 through the third conductive member 43 along the direction opposite to the direction indicated by the arrow of the first direction X, the negative electrode pole 13b of the last battery cell 1 in the first cell row 1b is electrically connected to the positive electrode pole 13a of the first battery cell 1 in the second cell row 1b along the direction indicated by the arrow of the first direction X, in the second cell row 1b, the negative electrode pole 13b of the former battery cell 1 is electrically connected to the positive electrode pole 13a of the latter battery cell 1 through the third conductive member 43 along the direction indicated by the arrow of the first direction X, the negative electrode pole 13b of the last battery cell 1 in the second cell row 1b is electrically connected to the positive electrode pole 13a of the first battery cell 1 in the third cell row 1b along the direction opposite to the direction indicated by the arrow of the first direction X, in the third cell row 1b, the negative electrode pole 13b of the former battery cell 1 is electrically connected to the positive electrode pole 13a of the latter battery cell 1 through the third conductive member 43 along the direction opposite to the direction indicated by the arrow of the first direction X, the negative electrode pole 13b of the last battery cell 1 in the third cell row 1b is electrically connected to the positive electrode pole 13a of the first battery cell 1 in the fourth cell row 1b along the direction indicated by the arrow of the first direction X. In addition, the connection of the battery cells 1 in the fourth cell row 1b and the fifth cell row 1b is similar to that in the second cell row 1b and the third cell row 1b, which will not be described herein. In this way, in the same cell row 1b, at least two battery cells 1 are connected in sequence along the first direction X through the third conductive member 43, and at least two cell rows 1b are connected in sequence along the second direction Y through the fourth conductive member 44.

[0168] More specifically, the positive electrode pole 13a and the negative electrode pole 13b of two adjacent battery cells 1 along the first direction X are arranged at the same position on the end cover 114, so that the extension direction of the third conductive member 43 is consistent with the first direction X. The positive electrode pole 13a and the negative electrode pole 13b of two adjacent battery cells 1 along the second direction Y are arranged at the opposite positions on the end cover 114, so that the extension direction of the fourth conductive member 44 is consistent with the second direction Y.

[0169] In this way, the plurality of battery monomers 1 are connected in series to form a battery monomer assembly with a large capacity, thereby improving the capacity of the battery device 100. Moreover, the battery monomers 1 adjacent along the first direction X have good insulation effect due to the arrangement of the heat-conducting insulation pad 3a, and the arrangement also reduces the pressure difference between the battery monomers 1 adjacent along the first direction X, thereby further reducing the risk of fire between the battery monomers 1 adjacent along the first direction X, and further reducing the risk of thermal runaway.

[0170] In some embodiments of the present application, the orthographic projection of the heat-conducting member 3 falls entirely within the orthographic projection range of the side surface 111 along the first direction X.

[0171] In this way, the heat-conducting member 3 does not exceed the side surface 111 in the plane perpendicular to the first direction X, and does not increase the space occupation due to the heat-conducting member 3 exceeding, thereby facilitating the improvement of the volume energy density of the battery device 100.

[0172] In some embodiments of the present application, the heat-conducting member 3 includes at least one of a heat-conducting silicone rubber layer, a graphene layer, a graphite layer, a carbon nanotube layer, a silicon carbide layer, a heat-conducting plastic layer, a heat-conducting plastic layer, a heat-conducting rubber layer, a heat-conducting silicone layer, and a metal layer.

[0173] The above-mentioned material layer can well play a heat-conducting role, thereby facilitating the heat dissipation, facilitating the temperature of the heated battery monomer 1 to be reduced to a suitable temperature as soon as possible, thereby accelerating the temperature control of the heated battery monomer 1, thereby reducing the risk of thermal runaway of the battery monomer 1, and further reducing the risk of thermal runaway of the battery device 100.

[0174] In some embodiments of the present application, the surface of the heat-conducting member 3 facing the side surface 111 is provided with an adhesive layer, and the heat-conducting member 3 is adhered to the side surface 111 through the adhesive layer.

[0175] The heat-conducting member 3 is adhered to the side surface 111 through the adhesive layer, thereby improving the stability of the heat-conducting member 3, and enabling the heat-conducting member 3 to more fully play a heat-dissipating role.

[0176] In some embodiments of the present application, as shown in Figure 5 the side surfaces 111 of the battery monomers 1 adjacent along the first direction X are adhered through the adhesive layer.

[0177] In this way, the side surfaces 111 of the battery monomers 1 adjacent along the first direction X are adhered through the adhesive layer, thereby improving the firmness of the adhesion of the adjacent battery monomers 1, and enabling the heat-dissipating effect to be better played.

[0178] In some embodiments of the present application, as shown in Figure 5As shown, the at least two battery monomers 1 include at least two monomer rows 1b arranged along the second direction Y, each monomer row 1b includes at least two battery monomers 1 arranged along the first direction X, in the same monomer row 1b, the plurality of battery monomers 1 are connected in series along the first direction X by the third conductive piece 43, and the at least two monomer rows 1b are connected in series along the second direction Y by the fourth conductive piece 44, and the side surfaces 111 of the adjacent battery monomers 1 along the first direction X are adhered by the adhesive layer.

[0179] The third conductive piece 43 and the fourth conductive piece 44 are components with conductive properties, which can be a long strip-shaped sheet, and the material can be, but is not limited to, copper, aluminum, nickel-chromium alloy, copper-nickel alloy, etc.

[0180] Specifically, referring to Figure 3 , the end cover 114 of each battery monomer 1 is provided with one positive pole 13a and one negative pole 13b, and the two are spaced apart along the first direction X, referring to Figure 5 , the first monomer row 1b, the second monomer row 1b, the third monomer row 1b, the fourth monomer row 1b and the fifth monomer row 1b are arranged in sequence along the direction of the arrow in the second direction Y, in the first monomer row 1b, along the direction opposite to the direction of the arrow in the first direction X, the negative pole 13b of the previous battery monomer 1 is electrically connected to the positive pole 13a of the next battery monomer 1 by the third conductive piece 43, and the negative pole 13b of the last battery monomer 1 in the first monomer row 1b is electrically connected to the positive pole 13a of the first battery monomer 1 in the second monomer row 1b along the direction of the arrow in the first direction X by the fourth conductive piece 44, in the second monomer row 1b, along the direction of the arrow in the first direction X, the negative pole 13b of the previous battery monomer 1 is electrically connected to the positive pole 13a of the next battery monomer 1 by the third conductive piece 43, and the negative pole 13b of the last battery monomer 1 in the second monomer row 1b is electrically connected to the positive pole 13a of the first battery monomer 1 in the third monomer row 1b along the direction opposite to the direction of the arrow in the first direction X by the fourth conductive piece 44, in the third monomer row 1b, along the direction opposite to the direction of the arrow in the first direction X, the negative pole 13b of the previous battery monomer 1 is electrically connected to the positive pole 13a of the next battery monomer 1 by the third conductive piece 43, in addition, the connection of each battery monomer 1 in the fourth monomer row 1b and the fifth monomer row 1b is similar to that in the second monomer row 1b and the third monomer row 1b, which will not be described here. In this way, in the same monomer row 1b, the at least two battery monomers 1 are connected in series along the first direction X by the third conductive piece 43, and the at least two monomer rows 1b are connected in series along the second direction Y by the fourth conductive piece 44.

[0181] More specifically, the positive electrode poles 13a and the negative electrode poles 13b of two battery monomers 1 adjacent along the first direction X are arranged at the same position on the end cover 114, so that the extending direction of the third conductive member 43 is consistent with the first direction X. The positive electrode poles 13a and the negative electrode poles 13b of two battery monomers 1 adjacent along the second direction Y are arranged at the opposite position on the end cover 114, so that the extending direction of the fourth conductive member 44 is consistent with the second direction Y.

[0182] In this way, the plurality of battery monomers 1 are connected in series to form a battery monomer assembly with large capacity, thereby improving the capacity of the battery device 100. In addition, in this way, the pressure difference between the battery monomers 1 adjacent along the first direction X is reduced, thereby reducing the risk of sparking between the battery monomers 1 adjacent along the first direction X, and further reducing the risk of thermal runaway.

[0183] In some embodiments of the present application, the adhesive layer is made of a heat-conducting adhesive.

[0184] In this way, the heat-conducting adhesive not only has the function of adhesion, but also facilitates heat conduction, thereby further improving the heat dissipation effect.

[0185] In some embodiments of the present application, the heat-conducting adhesive includes at least one of silicone heat-conducting adhesive, epoxy heat-conducting adhesive, polyurethane adhesive, and heat-conducting silicone grease.

[0186] The above-mentioned adhesive not only has the function of adhesion, but also facilitates heat conduction, thereby further improving the heat dissipation effect.

[0187] In some embodiments of the present application, as shown in Figure 7 The gap between the side surfaces 111 of the battery monomers 1 adjacent along the first direction X has a size L in the range of 0.2mm to 5mm along the first direction X.

[0188] For example, the size L of the gap between the side surfaces 111 of the battery monomers 1 adjacent along the first direction X can be, but is not limited to, 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4mm, 4.2mm, 4.4mm, 4.6mm, 4.8mm, 5mm.

[0189] In this way, by limiting the size L of the gap between the side surfaces 111 of the battery monomers 1 adjacent along the first direction X to the range of 0.2mm to 5mm, the heat of the battery monomers 1 is facilitated to be transferred to the adjacent battery monomers 1 through the side surfaces 111, and the volume energy density of the battery device 100 is not affected by the too large gap.

[0190] In some embodiments of the present application, as shown in Figure 8 The electrode assembly 12 is a wound structure wound from a laminate including positive electrode sheets and negative electrode sheets, and includes flat portions 121 and bent portions 122 provided at both ends of the flat portions 121 in the first direction X, and the laminate direction of the positive electrode sheets and the negative electrode sheets of the flat portions 121 is consistent with the second direction Y.

[0191] Figure 8 The dashed line is the boundary between the flat portions 121 and the bent portions 122, and the portion between the two dashed lines is the flat portion 121, and the portions on both sides of the flat portion 121 in the first direction X are the bent portions 122. The wound structure is arranged such that the bent portions 122 are close to the side surface 111 of the case 11.

[0192] Through the above arrangement, the bent portions 122 are close to the side surface 111 of the case 11, and the bent portions 122 form a relatively large space with the corner between the side surface 111 and the large surface 112. Thus, when the heat transferred from the side surface 111 of the case 11 is transferred to the electrode assembly 12, the transfer rate is relatively slow and the amount of heat transferred is relatively small due to the existence of the relatively large space, so the influence on the electrode assembly 12 is relatively small, thereby inhibiting the influence on the performance of the adjacent battery cell 1.

[0193] In some embodiments of the present application, as shown in Figure 9 The electrode assembly 12 is a laminated structure including positive electrode sheets and negative electrode sheets alternately laminated in the second direction Y.

[0194] Thus, the area of the electrode assembly 12 facing the side surface 111 is smaller than the area facing the large surface 112, and therefore, when the heat transferred from the side surface 111 is transferred to the electrode assembly 12, the transfer rate is relatively slow and the amount of heat transferred is relatively small due to the small area of the electrode assembly 12 facing the side surface 111, so the influence on the electrode assembly 12 is relatively small, thereby inhibiting the influence on the performance of the adjacent battery cell 1.

[0195] In some embodiments of the present application, as shown in Figure 6 At least a portion of at least two battery cells 1 is arranged along the second direction Y, and a buffer pad 5 is arranged between the large surfaces 112 of adjacent battery cells 1 in the second direction Y, and the buffer pad 5 is used to alleviate the expansion of the large surfaces 112.

[0196] When the temperature of the battery cell 1 changes, the large surface 112 of the case 11 is prone to expand and deform. In order to inhibit the degree of deformation of the large surface 112, the buffer pad 5 is provided, and the degree of deformation of the large surface 112 is inhibited by the buffer pad 5, which is beneficial to reduce the influence of the deformation of the large surface 112 on the performance of the battery cell 1.

[0197] In some embodiments of the present application, as shown in Figure 10As shown, the buffer pad 5 is provided with an avoiding opening 51 penetrating through the buffer pad 5 along the second direction Y, and the avoiding opening 51 is arranged opposite to the center of the large face 112 along the second direction Y.

[0198] In this way, the buffer pad 5 is arranged between the large faces 112 of the battery monomers 1 adjacent along the second direction Y, and the outward expansion of the large faces 112 can be inhibited, and by arranging the avoiding opening 51, a certain degree of expansion of the large faces 112 is allowed, so as to relieve the pressure in the shell 11, maintain the stability of the structure in the accommodating cavity, and prolong the service life of the battery monomers 1.

[0199] In some embodiments of the present application, as shown in Figure 10 As shown, the buffer pad 5 includes two first edges 52 opposite along the third direction Z and extending along the first direction X, and two second edges 53 opposite along the first direction X and extending along the third direction Z, and the two ends of the first edges 52 are connected to the two second edges 53 respectively, and the avoiding opening 51 is formed between the two first edges 52 and the two second edges 53.

[0200] In this way, the buffer pad 5 with the avoiding opening 51 is formed, and the relieving effect on the expansion of the large face 112 is realized, which is beneficial to reduce the influence of the deformation of the large face 112 on the performance of the battery monomer 1.

[0201] In some embodiments of the present application, the material of the first edge 52 includes porous foamed material and / or hard rubber; and / or, the material of the second edge 53 includes porous foamed material and / or hard rubber.

[0202] In this way, the buffer pad 5 formed has a relieving effect on the expansion of the large face 112, which is beneficial to reduce the influence of the deformation of the large face 112 on the performance of the battery monomer 1.

[0203] In some embodiments of the present application, the material of the first edge 52 and / or the second edge 53 includes porous foamed material, and the porous foamed material includes at least one of microcellular foamed polypropylene, polyurethane foam, polystyrene foam, and polyethylene foam.

[0204] The first edge 52 and / or the second edge 53 made of the above-mentioned material has certain supporting performance and certain elastic performance, can better relieve the expansion of the large face 112, and is more beneficial to reduce the influence of the deformation of the large face 112 on the performance of the battery monomer 1.

[0205] In some embodiments of the present application, as shown in Figure 6 The buffer pad 5 includes a heat insulation pad 5a.

[0206] In this way, the large faces 112 of the battery monomers 1 are heat-insulated by the heat insulation pad 5a, the heat transferred through the large faces 112 can be reduced, and the influence on the battery monomers 1 adjacent along the second direction Y can be reduced.

[0207] In some embodiments of the present application, the thermal insulation pad 5a is an aerogel thermal insulation pad or a foam thermal insulation pad.

[0208] Both the aerogel thermal insulation pad and the foam thermal insulation pad have thermal insulation and elastic properties, and can well play the role of heat insulation and well relieve the expansion of the large surface 112.

[0209] In some embodiments of the present application, the electrode assembly 12 includes alternatingly stacked positive electrode sheets and negative electrode sheets, the positive electrode sheet includes a positive current collector and a positive active material layer arranged on both surfaces of the positive current collector, and the active material of the positive active material layer includes lithium-containing phosphate; the negative electrode sheet includes a negative current collector and a negative active material layer arranged on both surfaces of the negative current collector, and the active material of the negative active material layer includes graphite.

[0210] In this way, the battery monomer 1 will not have too high a heating temperature in the case of temperature rise, and can effectively dissipate heat through heat transfer along the first direction X, thereby well reducing the risk of thermal runaway of the battery monomer 1, and further reducing the risk of thermal runaway of the battery device 100.

[0211] In some embodiments of the present application, the active material of the positive active material layer includes lithium iron phosphate, and the active material of the negative active material layer includes artificial graphite.

[0212] In this way, the battery monomer 1 is a lithium iron phosphate battery, and in the case of temperature rise, the heating temperature will not be too high, and can effectively dissipate heat through heat transfer along the first direction X, thereby well reducing the risk of thermal runaway of the battery monomer 1, and further reducing the risk of thermal runaway of the battery device 100.

[0213] In some embodiments of the present application, as shown in Figure 11 The side of the bottom plate 113 of at least two battery monomers 1 facing away from the accommodating cavity is provided with a heat exchange plate 6.

[0214] In this way, the heat exchange plate 6 can exchange heat with the bottom plate 113 of the battery monomer 1, promote heat dissipation from the bottom plate 113, further reduce the risk of thermal runaway of the battery monomer 1, and thereby reduce the risk of thermal runaway of the battery device 100.

[0215] In some embodiments of the present application, as shown in Figure 11 The heat exchange plate 6 is a hollow and flat liquid cooling plate, and a cooling liquid flows in the hollow inner cavity of the liquid cooling plate.

[0216] In this way, the heat dissipation of the battery monomer 1 can be promoted, and the flat structure of the heat exchange plate 6 can reduce the occupation of space and improve the volume energy density of the battery device 100.

[0217] In some embodiments of the present application, the battery device 100 further comprises a box 10, the box 10 comprising a first box 101 and a second box 102. The first box 101 and the second box 102 are buckled so that an enclosed space is formed inside the box 10 to accommodate the battery monomer 1, and the heat exchange plate 6 is arranged in the second box 102 and is in close contact with the bottom plate 113 of the battery monomer 1.

[0218] In this way, the heat exchange plate 6 is in close contact with the bottom plate 113, which can improve the heat dissipation effect of the battery monomer 1.

[0219] The second aspect of the present application provides a power utilization device, which comprises the battery device 100 provided by the first aspect for providing electric energy.

[0220] Since the power utilization device comprises the battery device 100 described above, the battery device 100 has a low risk of thermal runaway, and therefore the power utilization device has a low risk of thermal runaway.

[0221] The third aspect of the present application provides an energy storage device, which comprises a plurality of battery devices 100 provided by the first aspect, and the battery devices 100 are used for storing or providing electric energy.

[0222] Since the energy storage device comprises the battery device 100 described above, the energy storage device has all the beneficial effects of the battery device 100, and therefore the energy storage device has a low risk of thermal runaway.

[0223] In the following, specific examples of some embodiments of the present application will be described in conjunction with the accompanying drawings.

[0224] As a specific example, a battery pack (battery device 100) is provided, which comprises a battery box (box 10) and at least two battery cells (battery monomer 1) arranged in the battery box, the battery box comprising a lower box (second box 102) and an upper box (first box 101), the lower box and the upper box being buckled along the height direction (third direction Z) to form a containing space for containing the battery cells, the battery cells in the battery box being arranged in a matrix along the thickness direction (second direction Y) and the width direction (first direction X) of the battery cells, the large surface (large surface 112) of the battery cells being perpendicular to the thickness direction and the width direction, and a heat-conducting insulating pad (heat-conducting insulating pad 3a) being arranged between the battery cells adjacent along the width direction, and a mouth-shaped frame (the buffer pad 5 formed by the two first edges 52 and the two second edges 53) being arranged between the battery cells adjacent along the thickness direction.

[0225] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and 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, and they should be covered in the scope of the specification of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way.

Claims

1. A battery device, characterized by, The battery cell includes at least two battery monomers, and the battery monomers include: The shell has two sides opposite along a first direction and both perpendicular to the first direction, two large faces opposite along a second direction and both perpendicular to the second direction, and an end cover and a bottom plate opposite along a third direction and both perpendicular to the third direction, the first direction, the second direction and the third direction are perpendicular to each other, the side is connected between the two large faces, and the side and the large face are both connected between the end cover and the bottom plate, the side, the large face, the bottom plate and the end cover form a containing cavity, and the size of the large face along the first direction is greater than the size of the side along the second direction; At least one electrode assembly is contained in the containing cavity; At least a part of the at least two battery monomers is arranged along the first direction, A heat conduction member is arranged between the battery monomers adjacent along the first direction, and two opposite surfaces of the heat conduction member are respectively matched with the sides of the adjacent battery monomers; and / or The sides of the battery monomers adjacent along the first direction are matched; and / or The sides of the battery monomers adjacent along the first direction form a gap.

2. The battery device of claim 1, wherein The heat conduction coefficient of the heat conduction member is not less than 1 W / m.K.

3. The battery device of claim 2, wherein The heat conduction member includes a heat conduction insulation pad.

4. The battery device of claim 3, wherein The thickness of the heat conduction insulation pad is not greater than 5 mm.

5. The battery device of claim 3, wherein The thickness of the heat conduction insulation pad is 0.2 mm to 5 mm.

6. The battery device of claim 3, wherein The at least two battery monomers include at least two monomer columns arranged along the first direction, and each monomer column includes at least two battery monomers arranged along the second direction, In the same monomer column, the at least two battery monomers are sequentially connected in series along the second direction through a first conductive member, At least two monomer columns are sequentially connected in series along the first direction through a second conductive member.

7. The battery device of claim 3, wherein The at least two battery monomers include at least two monomer rows arranged along the second direction, and each monomer row includes at least two battery monomers arranged along the first direction, In the same monomer row, the at least two battery monomers are sequentially connected in series along the first direction through a third conductive member, At least two monomer rows are sequentially connected in series along the second direction through a fourth conductive member.

8. The battery device of claim 2, wherein The heat conduction member includes at least one of a heat conduction silicone rubber layer, a graphene layer, a graphite layer, a carbon nanotube layer, a silicon carbide layer, a heat conduction plastic layer, a heat conduction plastic layer, a heat conduction rubber layer, a heat conduction silica gel layer and a metal layer.

9. The battery device of claim 2, wherein, The surface of the heat conduction member facing the side is provided with an adhesive layer, and the heat conduction member is adhered to the side through the adhesive layer.

10. The battery device of claim 2, wherein The sides of the battery monomers adjacent along the first direction are adhered through an adhesive layer.

11. The battery device of claim 1, wherein The at least two battery monomers include at least two monomer rows arranged along the second direction, and each monomer row includes at least two battery monomers arranged along the first direction, 12. The battery device of claim 11, wherein, ​ At least two of the battery monomers in the same row are connected in series along the first direction by a third conductive member, At least two of the monomer rows are connected in series along the second direction by a fourth conductive member.

13. The battery device according to claim 10 or 11, characterized by, The adhesive layer is made of a heat-conductive adhesive.

14. The battery device of claim 13, wherein, The heat-conductive adhesive includes any one of a silicone heat-conductive adhesive, an epoxy resin heat-conductive adhesive, a polyurethane adhesive, and a heat-conductive silicone grease.

15. The battery device of claim 1, wherein, A gap is formed between the side surfaces of the battery monomers adjacent along the first direction, and the size of the gap along the first direction is in the range of 0.2mm to 5mm.

16. The battery device of any one of claims 1 to 12, wherein, The electrode assembly is a winding structure formed by winding a laminate including a positive electrode sheet and a negative electrode sheet, the winding structure including a flat portion and a bending portion provided at both ends of the flat portion in the first direction, and the stacking direction of the positive electrode sheet and the negative electrode sheet of the flat portion is consistent with the second direction.

17. The battery device of any one of claims 1 to 12, wherein, The electrode assembly is a laminated structure including positive electrode sheets and negative electrode sheets alternately stacked along the second direction.

18. The battery device according to any one of claims 1 to 12, At least a portion of the at least two battery monomers is arranged along the second direction, Along the second direction, a buffer pad is arranged between the large surfaces of adjacent battery monomers, and the buffer pad is used to relieve the expansion of the large surfaces.

19. The battery device of claim 18, wherein, The buffer pad is provided with an avoiding opening penetrating through the buffer pad along the second direction, and the avoiding opening is arranged opposite to the center of the large surface along the second direction.

20. The battery device of claim 19, wherein, The buffer pad includes two first edges extending along the first direction and opposite along the third direction, and two second edges extending along the third direction and opposite along the first direction, the two ends of the first edges are respectively connected to the two second edges, and the avoiding opening is formed between the two first edges and the two second edges.

21. The battery device according to claim 20, The material of the first edge includes porous foam material and / or hard rubber; and / or The material of the second edge includes porous foam material and / or hard rubber.

22. The battery device of claim 20, wherein, The material of the first edge and / or the second edge includes porous foam material, and the porous foam material includes any one of microcellular polypropylene, polyurethane foam, polystyrene foam, and polyethylene foam.

23. The battery device of claim 18, wherein, The buffer pad includes a thermal insulation pad.

24. The battery device of claim 23, wherein, The thermal insulation pad is an aerogel thermal insulation pad or a foam thermal insulation pad.

25. The battery device of any one of claims 1-12, wherein, The electrode assembly includes positive electrode sheets and negative electrode sheets alternately stacked, The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer provided on both surfaces of the positive electrode current collector, and the active material of the positive electrode active material layer includes lithium-containing phosphate; The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer provided on both surfaces of the negative electrode current collector, and the active material of the negative electrode active material layer includes graphite.

26. The battery device of claim 25, wherein, The active material of the positive electrode active material layer includes lithium iron phosphate, and the active material of the negative electrode active material layer includes artificial graphite.

27. The battery device of any one of claims 1-12, wherein, The side of the bottom plate of the at least two battery monomers away from the accommodating cavity is provided with a heat exchange plate.

28. The battery device of claim 27, wherein, The heat exchange plate is a hollow and flat liquid cooling plate, and a cooling liquid flows in the hollow inner cavity of the liquid cooling plate.

29. An electrical device, comprising: The electrical consumer comprises the battery device of any one of claims 1 to 28 for providing electrical energy.

30. An energy storage device, comprising: The battery device of any one of claims 1 to 28 for storing or providing electrical energy.

Images