Battery device and energy storage device and power utilization device with same

Abstract

The invention discloses a battery device and an energy storage device and a power utilization device with the same, and relates to the technical field of battery thermal management, the battery device comprises a battery monomer group, the battery monomer group comprises a plurality of battery monomers, and the plurality of battery monomers are stacked along a first direction and / or a second direction; the battery monomers subjected to heat preservation by the heat preservation part are first battery monomers, in a projection plane parallel to the first direction and the second direction, the plurality of first battery monomers are at least arranged at four corners of the battery monomer group, the heat preservation part comprises a plurality of sub heat preservation parts, and the plurality of sub heat preservation parts and the plurality of first battery monomers are arranged in a one-to-one correspondence manner. According to the battery device disclosed by the invention, the heat preservation cost of the battery device can be well reduced, and meanwhile, the plurality of heat preservation sub-parts of the heat preservation part and the plurality of first battery monomers needing heat preservation are arranged in a one-to-one correspondence manner and are matched with a small amount of heat preservation parts, so that the heat preservation part and the battery monomer group can be assembled and arranged more flexibly and conveniently.

Description

Technical Field

[0001] The present invention relates to the technical field of battery thermal management, and in particular to a battery device, an energy storage device and an electrical device having the same. Background Art

[0002] In the related art, the battery pack thermal insulation solution often uses a large area of thermal insulation materials to insulate the battery cells in the battery pack. The amount of materials used for thermal insulation is relatively large and there is a situation of thermal insulation redundancy, resulting in a relatively high thermal insulation cost of the battery pack. When the thermal insulation parts are arranged in the battery pack, the flexibility is poor and the assembly is relatively inconvenient. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. For this reason, the present invention provides a battery device, which can well reduce the amount of materials required for thermal insulation while meeting the thermal insulation requirements, reduce redundancy, thereby well reducing the thermal insulation cost, and making the arrangement of the thermal insulation parts more flexible and convenient.

[0004] The present invention also provides an energy storage device having the above battery device.

[0005] The present invention also provides an electrical device having the above battery device or energy storage device.

[0006] The battery device according to the first aspect of the present invention includes: a battery cell group, the battery cell group includes a plurality of battery cells, and the plurality of battery cells are stacked along a first direction and / or a second direction; a thermal insulation part, the thermal insulation part is arranged on one side of the battery cell group in a third direction, the third direction intersects with the second direction and the first direction pairwise, the thermal insulation part is configured to insulate a part of the plurality of battery cells, the battery cells insulated by the thermal insulation part are first battery cells, in a projection plane parallel to the first direction and the second direction, the plurality of first battery cells are arranged at least at four corner positions of the battery cell group, the thermal insulation part includes a plurality of sub-thermal insulation parts, and the plurality of sub-thermal insulation parts are arranged in one-to-one correspondence with the plurality of first battery cells.

[0007] According to the battery device of the present invention, by providing a thermal insulation part which is configured to insulate a part of the plurality of battery cells, the structure is simple and the arrangement is reasonable. It can reduce the amount of the thermal insulation part by performing targeted thermal insulation on the battery cells, thereby well reducing the thermal insulation cost of the battery device. At the same time, the plurality of sub-thermal insulation parts of the thermal insulation part are arranged in one-to-one correspondence with the plurality of first battery cells that need to be insulated, and in combination with the relatively small amount of the thermal insulation part, it makes the thermal insulation part more flexible and convenient when assembled and arranged with the battery cell group.

[0008] In some embodiments of the present invention, one side surface of the first battery cell facing the heat-insulating member is formed as a heat-insulating surface, and the ratio of the projection of the heat-insulating member on the heat-insulating surface to the area of the heat-insulating surface is greater than or equal to 30% and less than or equal to 70%.

[0009] In this embodiment, setting the ratio of the projection of the heat-insulating member on the heat-insulating surface to the area of the heat-insulating surface to be greater than or equal to 30% and less than or equal to 70% can enable the heat-insulating member and the first battery cell to have sufficient cooperative heat-insulating area to meet the heat-insulating requirements, and can reduce the influence of the arrangement of the heat-insulating member and the first battery cell on the cooling capacity and heating capacity of the thermal management system of the battery device. Especially when the battery cell dissipates heat, since the first battery cell at the arrangement position of the heat-insulating member often dissipates heat relatively fast by itself, the arrangement of the heat-insulating member has little influence on its heat dissipation, so that the battery device can operate stably and reliably.

[0010] In an embodiment of the present invention, the ratio of the projection of the heat-insulating member on the heat-insulating surface to the area of the heat-insulating surface is greater than or equal to 30% and less than or equal to 50%.

[0011] In this embodiment, further limiting the ratio of the projection of the heat-insulating member on the heat-insulating surface to the area of the heat-insulating surface to be greater than or equal to 30% and less than or equal to 50% can further reduce the influence on the cooling capacity and heating capacity of the thermal management system while meeting the heat-insulating requirements of the first battery cell, so that the battery device can operate more stably and reliably.

[0012] In some embodiments of the present invention, the battery cells at both ends in the first direction and / or the second direction are provided with the heat-insulating member.

[0013] In this embodiment, arranging the heat-insulating member at both end portions of the battery cell group in the first direction and / or the second direction is reasonable and can play a good heat-insulating role to meet the heat-insulating requirements of the battery cell group.

[0014] In some embodiments of the present invention, a plurality of the battery cells are stacked and arranged along the first direction to form a battery cell assembly. The first direction is the thickness direction of the battery cell. The number of the battery cell assemblies is multiple, and the multiple battery cell assemblies are arranged in sequence along the second direction. The second direction is the length direction of the battery cell.

[0015] In an embodiment of the present invention, a plurality of the battery cells at the outermost side at any end of the battery cell assembly in the first direction form a second cell group, and at least two of the outermost battery cells at any end portion of the second cell group in the second direction are provided with the heat-insulating member; or, all the battery cells of the second cell group are provided with the heat-insulating member.

[0016] In this embodiment, at least two battery cells on the outermost side of any one end of the second monomer assembly in the second direction are provided with heat preservation members, or heat preservation members are provided for multiple battery cells of the second monomer group, which can further increase the number and range of battery cells insulated by the heat preservation members, make the arrangement of the heat preservation members more flexible, can well improve the heat preservation effect of the heat preservation members on the battery cells, and well improve the overall heat preservation performance of the battery cell group, so as to better meet the heat preservation requirements of the battery device.

[0017] In some embodiments of the present invention, the battery device further includes a partition beam extending along the second direction, and multiple battery cells of the battery cell group are respectively arranged on both sides of the partition beam. The battery cell assemblies at both ends of the battery cell group in the second direction are the first monomer groups. In the first monomer group, the two battery cells located on both sides of the partition beam are both provided with the heat preservation members.

[0018] In this embodiment, by providing heat preservation members for the battery cells adjacent to the partition beam in the first monomer group, the influence of the relatively fast temperature attenuation of the battery cells at the partition beam on the overall heat preservation performance of the battery cell group can be well reduced, so that the overall heat preservation performance of the battery cell group can be well maintained.

[0019] In some embodiments of the present invention, the heat preservation member is a foamed member.

[0020] In this embodiment, the heat preservation member is set as a foamed member, so that the heat preservation member can play a good heat preservation role and well meet the heat preservation requirements of the battery cell group.

[0021] In an embodiment of the present invention, the foamed member is a polypropylene member, or the foamed member is a polyethylene member.

[0022] In this embodiment, setting the foamed member as a polypropylene member or a polyethylene member can well meet the heat preservation requirements of the battery cell group for the heat preservation member, and enable the foamed member to flexibly set specific material members according to heat preservation requirements and assembly requirements, etc.

[0023] In some embodiments of the present invention, the heat preservation member is a vacuum insulation member.

[0024] In this embodiment, setting the heat preservation member as a vacuum insulation member can well meet the heat preservation requirements of the battery cell group.

[0025] In some embodiments of the present invention, the battery device further includes: a heat exchange plate and a thermal conductive adhesive. The heat exchange plate is disposed on one side of the battery cell group in the third direction, and the battery cell group is connected to the heat exchange plate through the thermal conductive adhesive. Wherein, the heat insulation member is disposed between the first battery cell and the thermal conductive adhesive, or the heat insulation member is disposed between the thermal conductive adhesive and the heat exchange plate.

[0026] In this embodiment, the heat insulation member is disposed between the first battery cell and the thermal conductive adhesive or between the thermal conductive adhesive and the heat exchange plate. The structure is simple, which is convenient for the assembly and arrangement of the heat insulation member with the battery cell group and the heat exchange plate, and makes the arrangement of the heat insulation member with the battery cell group relatively flexible and convenient.

[0027] In an embodiment of the present invention, the heat insulation member is adhesively fixed to the first battery cell, or the heat insulation member is adhesively fixed to the heat exchange plate.

[0028] In this embodiment, the heat insulation member is adhesively fixed to the first battery cell or to the heat exchange plate. The structure is simple, and the fixing is convenient and reliable, which can make the assembly and fixing of the heat insulation member and the battery cell relatively convenient and fast.

[0029] In some embodiments of the present invention, the surface of the first battery cell facing the heat insulation member forms a heat insulation surface, and the projection of the heat insulation member on the heat insulation surface is at least one of a rectangle, a triangle, a ring, or a cross.

[0030] In this embodiment, the projection of the heat insulation member on the heat insulation surface is set to be at least one of a rectangle, a triangle, a ring, or a cross, so that the shape, size, etc. of the heat insulation member can be flexibly and conveniently set according to needs.

[0031] In an embodiment of the present invention, with the diagonal of the heat insulation surface as the boundary, or with the midline of the heat insulation surface in the first direction or the second direction as the boundary, half of the heat insulation surface is covered with the heat insulation member.

[0032] In this embodiment, with the diagonal of the heat insulation surface, the midline in the first direction or the second direction as the boundary, the projection of the heat insulation member 12 on the heat insulation surface of the first battery cell is set to cover half of the heat insulation surface, so that the heat insulation surface of the first battery cell has a relatively large heat insulation cooperation area and heat dissipation area, which can well meet the needs of heat insulation and heat dissipation of the first battery cell.

[0033] In an embodiment of the present invention, the projection of the heat insulation member on the heat insulation surface is a rectangle. In the first direction or the second direction, the heat insulation member is disposed in the middle of the heat insulation surface and extends to both side edges of the heat insulation surface, or the projection of the heat insulation member on the heat insulation surface is spaced from the edge of the heat insulation surface.

[0034] In this embodiment, the heat-insulating member is arranged in the middle of the heat-insulating surface and extends to both side edges of the heat-insulating surface, or the projection of the heat-insulating member on the heat-insulating surface is spaced from the edge of the heat-insulating surface, so that the arrangement of the heat-insulating member and the first battery cell can be more flexible and variable, and the heat-insulating member can be more flexibly and conveniently arranged with the battery cell group as needed.

[0035] In an embodiment of the present invention, the projection of the heat-insulating member on the heat-insulating surface extends in a ring shape along the circumference of the heat-insulating surface, and the outer periphery of the projection of the heat-insulating member is flush with the outer periphery of the heat-insulating surface.

[0036] In this embodiment, the projection of the heat-insulating member on the heat-insulating surface is arranged to extend in a ring shape along the circumference of the heat-insulating surface, and the outer periphery of the projection of the heat-insulating member is flush with the outer periphery of the heat-insulating surface. The structure is simple and can well meet the heat preservation and heat dissipation needs of the first battery cell.

[0037] The energy storage device according to the second aspect of the present invention includes the battery device according to the first aspect of the present invention, and the battery device is used to store or provide electric energy.

[0038] According to the energy storage device of the present invention, by providing the battery device of the first aspect above, and by providing a heat-insulating member, the heat-insulating member is configured to heat-insulate a part of the plurality of battery cells. The structure is simple and the arrangement is reasonable. By specifically heat-insulating the battery cells, the amount of the heat-insulating member can be reduced while meeting the heat-insulating requirements, thereby well reducing the heat-insulating cost of the battery device. At the same time, the multiple sub-heat-insulating members of the heat-insulating member are arranged in one-to-one correspondence with the multiple first battery cells that need to be heat-insulated, and the amount of the heat-insulating member used is small, so that the heat-insulating member can be more flexible and convenient when assembled and arranged with the battery cell group.

[0039] The electrical device according to the third aspect of the present invention includes the battery device according to the first aspect of the present invention or the energy storage device according to the second aspect of the present invention.

[0040] According to the electrical device of the present invention, by providing the battery device of the first aspect or the energy storage device of the second aspect above, and by providing a heat-insulating member, the heat-insulating member is configured to heat-insulate a part of the plurality of battery cells. The structure is simple and the arrangement is reasonable. By specifically heat-insulating the battery cells, the amount of the heat-insulating member can be reduced while meeting the heat-insulating requirements, thereby well reducing the heat-insulating cost of the battery device. At the same time, the multiple sub-heat-insulating members of the heat-insulating member are arranged in one-to-one correspondence with the multiple first battery cells that need to be heat-insulated, and the amount of the heat-insulating member used is small, so that the heat-insulating member can be more flexible and convenient when assembled and arranged with the battery cell group.

[0041] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. Brief Description of the Drawings

[0042] Figure 1 is a schematic diagram of an electrical device according to an embodiment of the present invention; Figure 2 is a schematic diagram of a battery device according to an embodiment of the present invention; Figure 3 is a schematic diagram of the battery device from another angle according to an embodiment of the present invention; Figure 4 is Figure 3 a cross-sectional view taken along line A-A shown in Figure 5 is Figure 4 a partially enlarged schematic diagram of position B shown in Figure 6 is a schematic diagram of the box body and the battery cell group of the battery device according to an embodiment of the present invention; Figure 7 is a schematic diagram of the box body and the heat preservation member of the battery device according to an embodiment of the present invention; Figure 8 is a schematic diagram of the battery cell group and the heat preservation member according to an embodiment of the present invention; Figure 9 is a schematic diagram of the battery cell group and the heat preservation member from another angle according to an embodiment of the present invention; Figure 10 is a schematic diagram of the first distribution mode of the first battery cell in the battery cell group according to an embodiment of the present invention; Figure 11 is a schematic diagram of the second distribution mode of the first battery cell in the battery cell group according to an embodiment of the present invention; Figure 12 is a schematic diagram of the third distribution mode of the first battery cell in the battery cell group according to an embodiment of the present invention; Figure 13 is a schematic diagram of the fourth distribution mode of the first battery cell in the battery cell group according to an embodiment of the present invention; Figure 14 is a schematic diagram of the heat preservation member and the first battery cell according to the first embodiment of the present invention; Figure 15 is a schematic diagram of the heat preservation member and the first battery cell according to the second embodiment of the present invention; Figure 16 is a schematic diagram of the heat preservation member and the first battery cell according to the third embodiment of the present invention; Figure 17 is a schematic diagram of the heat preservation member and the first battery cell according to the fourth embodiment of the present invention; Figure 18Schematic diagram of the heat preservation component and the first battery cell according to the fifth embodiment of the present invention; Figure 19 Schematic diagram of the heat preservation component and the first battery cell according to the sixth embodiment of the present invention; Figure 20 Schematic diagram of the heat preservation component and the first battery cell according to the seventh embodiment of the present invention; Figure 21 Schematic diagram of the heat preservation component and the first battery cell according to the eighth embodiment of the present invention; Figure 22 Schematic diagram of the heat preservation component and the first battery cell according to the ninth embodiment of the present invention.

[0043] Reference numerals: 10. Battery device; 11. Battery cell group; 1101. First monomer group; 1102. Second monomer group; 111. Battery cell assembly; 1111. First battery cell; 12. Heat preservation component; 13. Box body; 131. Partition beam; 14. Heat exchange plate; 20. Motor; 30. Controller; 100. Electrical device. Detailed implementation manners

[0044] Hereinafter, embodiments of the technical solution of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and thus are only examples and cannot be used to limit the protection scope of the present invention.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above accompanying drawings are intended to cover non-exclusive inclusion.

[0046] In the description of the embodiments of the present invention, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present invention, "a plurality" means more than two unless otherwise specifically defined.

[0047] References to "embodiments" in this document mean that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present invention. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0048] In the description of the embodiments of the present invention, the term "and / or" is merely a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally represents an "or" relationship between the associated objects before and after.

[0049] In the description of the embodiments of the present invention, the term "plurality" refers to two or more (including two).

[0050] In the description of the embodiments of the present invention, the orientation or positional relationship indicated by technical terms such as "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present invention.

[0051] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0052] Currently, from the perspective of the development of the market situation, the application of power batteries is becoming more and more widespread. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as military equipment and aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also continuously increasing.

[0053] When the battery device is operating in a low-temperature environment, it has a need for heat preservation. In the relevant technology, the heat preservation scheme adopted by the battery device is usually a global homogenized heat preservation method, that is, the battery device completely covers all the battery cells in the battery device with heat preservation materials, and all the battery cells are uniformly insulated. This can meet the heat preservation needs of the battery device, but there is redundancy in the heat preservation, and the amount of heat preservation materials used is large. In fact, the heat preservation in the battery device needs to solve the heat preservation problem of the battery cells with a faster heat loss rate in a low-temperature environment among multiple battery cells. Since the battery cells at different positions in the battery device The heat dissipation conditions of battery cells are not the same. For example, the outermost battery cell among the multiple arranged battery cells has a larger heat dissipation space and a larger heat dissipation area with the external environment, so the temperature drops faster, while the temperature of the battery cell near the middle drops more slowly. Therefore, the insulation requirements of battery cells in different positions are also different. If a global homogenized insulation method is adopted, insulation materials will be arranged in battery cells where insulation materials are not needed, resulting in insulation redundancy of battery cells, making the effective utilization rate of insulation materials low. The arrangement of more insulation materials will increase the insulation cost of the battery device.

[0054] On the other hand, when the thermal insulation material is assembled and fixed to all the battery cells, due to the large area, the thermal insulation material needs to be aligned with the laying surface formed by all the battery cells, which may easily cause the thermal insulation material to deform and wrinkle, or some parts of the battery cells that must be insulated may not be insulated by the thermal insulation material, making the thermal insulation material and the battery device less flexible and inconvenient to assemble.

[0055] Based on the above considerations, in order to reduce the insulation cost and facilitate the assembly of insulation parts in the battery device, the inventor designed a battery device, insulated a part of the battery cells among the multiple battery cells by arranging insulation parts, and the sub-insulation parts of the insulation parts are arranged one by one corresponding to the battery cells that need to be arranged with the insulation parts, thereby reducing the number of arranged insulation parts. The insulation parts can be flexibly arranged in the battery cells at the positions of the battery device where the temperature drops faster and the heat dissipation is better to maintain a good insulation effect, thereby greatly reducing the insulation cost of the battery device while meeting the insulation needs of the battery device, and making the insulation parts more flexible and convenient to assemble in the battery device.

[0056] The battery device mentioned in the embodiment of the present invention may include one or more battery cells for providing voltage and capacity. Multiple battery cells are connected in series, in parallel or in mixed connection through a busbar. The battery device may be a battery pack, which includes a box body, and the battery cells are accommodated in the box body.

[0057] As an example, the battery box may include a first box body and a second box body. The first box body and the second box body are buckled together so that a closed space is formed inside the box to accommodate the battery cell group. Here, "closed" means covered or closed, which can be sealed or non-sealed. The first box body can be a top cover or a bottom plate.

[0058] As an example, the battery box may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that a closed space is formed inside the box to accommodate the battery cell assembly.

[0059] In some embodiments, the battery box can be part of the chassis structure of a vehicle. For example, part of the battery box can become at least part of the floor of the vehicle, or part of the battery box can become at least part of the crossbeam and longitudinal beam of the vehicle.

[0060] The battery device disclosed in the embodiments of the present invention can be used in an electrical device that uses the battery device as a power source, or various energy storage systems that use the battery device as an energy storage element. The electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, and an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, and a spaceship, etc.

[0061] For example, when the electrical device is a vehicle, the vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery is provided inside the vehicle, and the battery can be provided at the bottom, head, or tail of the vehicle. The battery can be used for power supply of the vehicle. For example, the battery can be used as the operating power source of the vehicle. The vehicle can also include a controller and a motor. The controller is used to control the battery to supply power to the motor, for example, for the working power requirements during the start, navigation, and driving of the vehicle.

[0062] In some embodiments of the present invention, the battery can not only be used as the operating power source of the vehicle, but also be used as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0063] For the convenience of description in the following embodiments, taking the electrical device as a vehicle as an example, the electrical device and the battery device of the present invention are introduced in detail.

[0064] Next, refer to Figures 2 - 22 to describe the battery device 10 according to the embodiment of the first aspect of the present invention. Figure 2 is a schematic diagram of the battery device 10 according to the embodiment of the present invention; Figure 3 is a schematic diagram of the battery device 10 from another angle according to the embodiment of the present invention; Figure 4Yes Figure 3 The sectional view taken along line A-A shown in Figure 5 Yes Figure 4 The enlarged partial view of position B shown in Figure 6 It is a schematic diagram of the box body 13 and the battery cell group 11 of the battery device 10 according to an embodiment of the present invention; Figure 7 It is a schematic diagram of the box body 13 and the heat preservation member 12 of the battery device 10 according to an embodiment of the present invention; Figure 8 It is a schematic diagram of the battery cell group 11 and the heat preservation member 12 according to an embodiment of the present invention; Figure 9 It is a schematic diagram of the battery cell group 11 and the heat preservation member 12 from another angle according to an embodiment of the present invention; Figure 10 It is a schematic diagram of the first distribution mode of the first battery cell 1111 in the battery cell group 11 according to an embodiment of the present invention; Figure 11 It is a schematic diagram of the second distribution mode of the first battery cell 1111 in the battery cell group 11 according to an embodiment of the present invention; Figure 12 It is a schematic diagram of the third distribution mode of the first battery cell 1111 in the battery cell group 11 according to an embodiment of the present invention; Figure 13 It is a schematic diagram of the fourth distribution mode of the first battery cell 1111 in the battery cell group 11 according to the fourth embodiment of the present invention; Figure 14 It is a schematic diagram of the heat preservation member 12 and the first battery cell 1111 according to the first embodiment of the present invention; Figure 15 It is a schematic diagram of the heat preservation member 12 and the first battery cell 1111 according to the second embodiment of the present invention; Figure 16 It is a schematic diagram of the heat preservation member 12 and the first battery cell 1111 according to the third embodiment of the present invention; Figure 17 It is a schematic diagram of the heat preservation member 12 and the first battery cell 1111 according to the fourth embodiment of the present invention; Figure 18 It is a schematic diagram of the heat preservation member 12 and the first battery cell 1111 according to the fifth embodiment of the present invention; Figure 19 It is a schematic diagram of the heat preservation member 12 and the first battery cell 1111 according to the sixth embodiment of the present invention; Figure 20 It is a schematic diagram of the heat preservation member 12 and the first battery cell 1111 according to the seventh embodiment of the present invention; Figure 21 It is a schematic diagram of the heat preservation member 12 and the first battery cell 1111 according to the eighth embodiment of the present invention; Figure 22 It is a schematic diagram of the heat preservation member 12 and the first battery cell 1111 according to the ninth embodiment of the present invention.

[0065] As Figures 2 - 22 shown, the battery device 10 according to the embodiment of the first aspect of the present invention includes: a battery cell group 11 and a heat preservation member 12. The battery cell group 11 includes a plurality of battery cells, and the plurality of battery cells are arranged along a first direction (such asFigure 6 in the x - direction shown) and / or the second direction (such as Figure 6 in the y - direction shown) are stacked; the heat - insulating member 12 is provided on one side of the battery cell group 11 in the third direction (such as Figure 6 in the z - direction shown). The third direction intersects the second direction and the first direction pairwise. The heat - insulating member 12 is configured to thermally insulate a part of the battery cells among the plurality of battery cells. The battery cells thermally insulated by the heat - insulating member 12 are the first battery cells 1111. In the projection plane parallel to the first direction and the second direction, a plurality of the first battery cells 1111 are arranged at least at four corner positions of the battery cell group 11. The heat - insulating member 12 includes a plurality of sub - heat - insulating members, and the plurality of sub - heat - insulating members are arranged in one - to - one correspondence with the plurality of first battery cells 1111.

[0066] In this embodiment, the battery device 10 includes a battery cell group 11. The battery cell group 11 includes a plurality of battery cells. The battery cells can be secondary batteries. A secondary battery refers to a battery cell that can be activated by charging after discharging so as to be used continuously. The battery cells can be lithium - ion batteries, sodium - ion batteries, sodium - lithium - ion batteries, lithium - metal batteries, sodium - metal batteries, lithium - sulfur batteries, magnesium - ion batteries, nickel - metal - hydride batteries, nickel - cadmium batteries, lead - acid batteries, etc. The embodiments of the present invention do not limit this.

[0067] In this embodiment, a plurality of battery cells are stacked in the first direction and / or the second direction. For example, a plurality of battery cells can be stacked in the first direction, a plurality of battery cells can also be stacked in the second direction, and a plurality of battery cells can also be stacked in the first direction and the second direction to be arranged in an array.

[0068] In this embodiment, the heat - insulating member 12 is provided on one side of the battery cell group 11 in the third direction and is configured to thermally insulate a part of the battery cells among the plurality of battery cells. Exemplarily, the heat - insulating member 12 can be arranged on one side of some battery cells in the battery cell group 11 in the third direction, so as to reduce the contact between one side of the battery cells and the external environment or the heat - conducting structure, and thermally insulate the battery cells.

[0069] It can be understood that when the ambient temperature drops, the heat dissipation of battery cells at different positions is different, and the temperature decay rate is also different. For example, among multiple battery cells, the battery cells near the edge in the overall arrangement area have a significantly higher temperature decay rate and lower temperature due to reasons such as large exposure area and short heat dissipation path. While the battery cells in the central area can form the required heat preservation effect without setting the heat preservation member 12. Therefore, the heat preservation of these battery cells with lower temperature has a greater impact on the overall heat preservation performance of the battery device 10, and the central area does not require the heat preservation of the heat preservation member 12. In this embodiment, the heat preservation member 12 is provided to heat-preserve some of the multiple battery cells. When arranging the heat preservation member 12, the heat preservation member 12 can be arranged at the battery cells with lower temperature when the ambient temperature drops, so that these battery cells can be heat-preserved by the heat preservation member 12, thereby enabling the overall heat preservation performance of the battery cell group 11 in the battery device 10 to be well maintained, and thus meeting the heat preservation requirements of the battery device 10.

[0070] Exemplarily, when determining the battery cells that need to be arranged with the heat preservation member 12 in the battery device 10, the battery device 10 can adopt a simulation method and make corresponding settings for the simulation according to the heat preservation requirements. Simulate the temperature distribution data of the battery cell group 11 when the ambient temperature drops from a certain temperature to the set temperature, so as to select a part of the battery cells with lower temperature for heat preservation with the heat preservation member 12 according to the heat preservation requirements.

[0071] In this embodiment, by using the heat preservation member 12 to heat-preserve some of the multiple battery cells, the heat preservation of the battery cells can be targeted in combination with the heat dissipation conditions of the battery cells at different positions in the battery device 10, so that the arrangement of the heat preservation member 12 can be concentrated in the weak area with the largest heat loss. Thus, it can not only maintain the overall heat preservation performance of the battery cell group 11, but also reduce the arrangement of the heat preservation member 12 in the non-essential areas in the arrangement area of the battery cells, thereby well saving the amount of the heat preservation member 12 and well reducing the heat preservation cost of the battery device 10.

[0072] In this embodiment, multiple sub-heat preservation members of the heat preservation member 12 are arranged in one-to-one correspondence with multiple first battery cells 1111. That is to say, the heat preservation member 12 is composed of multiple separate sub-heat preservation members, and one sub-heat preservation member is arranged on each first battery cell 1111, so that the heat preservation member can cover all the first battery cells 1111. The structural forms of the multiple sub-heat preservation members in the heat preservation member 12 can be the same, which is convenient for the mass production of the heat preservation member 12. When the distribution and quantity of the first battery cells 1111 in different battery devices 10 in the battery cell group are different, the multiple sub-heat preservation members can still be conveniently and flexibly arranged with the first battery cells 1111.

[0073] It can be understood that in the battery cell group 11, among the multiple battery cells located at the end of the battery cell group 11, the four battery cells at the corners usually have the largest exposed area and shorter heat dissipation paths. Therefore, the positions of the four battery cells at the four corner positions are usually the areas with the largest heat loss in the battery cell group 11. In this embodiment, by arranging at least a plurality of sub-thermal insulation members 12 of the thermal insulation member 12 at the four corner positions of the battery cell group 11, the heat preservation requirement of the battery cell group 11 can be well met, and the arrangement quantity and usage amount of the thermal insulation member 12 can be reduced while maintaining the required heat preservation performance of the battery device 10, thereby well reducing the heat preservation cost of the battery device 10.

[0074] For the battery device 10 according to the embodiment of the present invention, by providing the thermal insulation member 12, the thermal insulation member 12 is configured to thermally insulate a part of the multiple battery cells. The structure is simple and the arrangement is reasonable. By performing targeted thermal insulation on the battery cells, the usage amount of the thermal insulation member 12 can be reduced while meeting the heat preservation requirement, thereby well reducing the heat preservation cost of the battery device 10. At the same time, a plurality of sub-thermal insulation members of the thermal insulation member 12 are arranged in one-to-one correspondence with the multiple first battery cells 1111 that need to be thermally insulated, and the usage amount of the thermal insulation member 12 is less, so that the thermal insulation member 12 can be more flexible and convenient when assembled and arranged with the battery cell group 11.

[0075] In some embodiments of the present invention, referring to Figure 9 and Figure 14 as shown, one side surface of the first battery cell 1111 facing the thermal insulation member 12 is formed as a thermal insulation surface, and the ratio of the projection of the thermal insulation member 12 on the thermal insulation surface to the area of the thermal insulation surface can be greater than or equal to 30% and less than or equal to 70%.

[0076] In this embodiment, the ratio of the projection of the thermal insulation member 12 on the thermal insulation surface of the first battery cell 1111 is set to be greater than or equal to 30% and less than or equal to 70%. For example, the ratio of the projection of the thermal insulation member 12 on the thermal insulation surface can be 30%, 31%, 32%, 35%, 38%, 40%, 45%, 50%, 60%, 70%, etc. Exemplarily, referring to Figures 14 - 22 as shown, the projection shape of the thermal insulation member 12 on the thermal insulation surface can be rectangular, annular, triangular, etc., and the projection shape of the thermal insulation member 12 on the thermal insulation surface can be flexibly set according to the heat preservation requirement.

[0077] It can be understood that during the use of the battery device 10, the battery cells in the battery cell group 11 not only need to be thermally insulated but also need to dissipate heat and be cooled. In this embodiment, the ratio of the projection of the thermal insulation member 12 on the thermal insulation surface to the area of the thermal insulation surface is set to be greater than or equal to 30% and less than or equal to 70%. This can enable the thermal insulation member 12 to have sufficient mating thermal insulation area with the first battery cell 1111 to meet the thermal insulation requirements, and can reduce the impact of the arrangement of the thermal insulation member 12 and the first battery cell 1111 on the cooling capacity and heating capacity of the thermal management system of the battery device 10. Especially when the battery cell dissipates heat, since the first battery cell 1111 at the arrangement position of the thermal insulation member 12 usually dissipates heat relatively quickly, the arrangement of the thermal insulation member 12 has little impact on its heat dissipation, so that the battery device 10 can operate stably and reliably.

[0078] In an embodiment of the present invention, the ratio of the projection of the thermal insulation member 12 on the thermal insulation surface to the area of the thermal insulation surface can be greater than or equal to 30% and less than or equal to 50%.

[0079] In this embodiment, the ratio of the projection of the thermal insulation member 12 on the thermal insulation surface to the area of the thermal insulation surface can be greater than or equal to 30% and less than or equal to 50%. For example, the ratio of the projection of the thermal insulation member 12 on the thermal insulation surface to the area of the thermal insulation surface can be 30%, 31%, 32%, 35%, 38%, 40%, 42%, 45%, 50%, etc.

[0080] In this embodiment, the ratio of the projection of the thermal insulation member 12 on the thermal insulation surface is further limited to be greater than or equal to 30% and less than or equal to 50%. This enables the thermal insulation member 12 to further reduce the impact on the cooling capacity and heating capacity of the thermal management system while meeting the thermal insulation requirements of the first battery cell 1111, so that the battery device 10 can operate more stably and reliably.

[0081] In some embodiments of the present invention, referring to Figures 9 - 13 as shown, the battery cells at both ends in the first direction and / or the second direction can be provided with the thermal insulation member 12.

[0082] In this embodiment, the thermal insulation member 12 is arranged at both end portions of the battery cell group 11 in the first direction and / or the second direction. For example, the thermal insulation member 12 can be arranged at the positions of multiple battery cells at both end portions of the battery cell group 11 in the first direction. The thermal insulation member 12 can also be arranged at the positions of multiple battery cells at both end portions of the battery cell group 11 in the second direction. Multiple battery cells at both ends of the battery cell group 11 in the first direction and the second direction can also be arranged with the thermal insulation member 12. The specific arrangement position of the thermal insulation member 12 can be reasonably set and arranged according to the position of the weak area with large heat loss in the battery cell group 11 and the thermal insulation requirements, etc.

[0083] It can be understood that, since the battery cells near the edge position in the battery cell group 11 usually have greater heat loss, in this embodiment, the heat preservation member 12 is arranged at both ends of the battery cell group 11 in the first direction and / or the second direction. The arrangement is reasonable and can play a good heat preservation role to meet the heat preservation needs of the battery cell group 11.

[0084] In some embodiments of the present invention, referring to Figures 9 - 13 As shown, a plurality of battery cells are stacked and arranged in the first direction to form a battery cell assembly 111. The first direction is the thickness direction of the battery cell. The number of battery cell assemblies 111 is multiple, and multiple battery cell assemblies 111 are arranged in sequence in the second direction. The second direction is the length direction of the battery cell.

[0085] In this embodiment, a plurality of battery cells stacked and arranged in the first direction form a battery cell assembly 111. Optionally, the battery cell assembly 111 can be a battery module. The battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. Exemplarily, the battery module can be formed by bundling a plurality of battery cells with cable ties. The battery cell assembly 111 can be accommodated in the box body 13 by fixing the battery module to the box body 13, or the battery cell assembly 111 can also be accommodated in the box body 13 by directly fixing a plurality of battery cells to the box body 13.

[0086] In one embodiment of the present invention, as Figure 9 shown, the battery cell assemblies 111 at both ends of the battery cell group 11 in the second direction are the first cell groups 1101. At least two battery cells on the outermost side at any one end of the first cell groups 1101 in the first direction can be provided with the heat preservation member 12.

[0087] In this embodiment, the battery cell assemblies 111 at both ends of the battery cell group 11 in the second direction are set as the first cell groups 1101. At least two battery cells on the outermost side at any one end of the first cell groups 1101 in the first direction are provided with the heat preservation member 12. Referring to Figure 9 shown, at least two battery cells at each corner position in the battery cell group 11 can be provided with the heat preservation member 12. For example, two, three, four, etc. battery cells stacked and arranged in the first direction at each corner position can be provided with the heat preservation member 12 on one side in the third direction.

[0088] In this embodiment, setting at least two battery cells on the outermost side at any one end of the first cell groups 1101 in the first direction with the heat preservation member 12 can increase the number and range of battery cells insulated by the heat preservation member 12, make the arrangement of the heat preservation member 12 more flexible, can improve the heat preservation effect of the heat preservation member 12 on the battery cells, and can greatly improve the overall heat preservation performance of the battery cell group 11, so as to better meet the heat preservation needs of the battery device 10.

[0089] In one embodiment of the present invention, with reference to Figures 9 - 12 as shown, a plurality of battery cells on the outermost side at any one end of the battery cell assembly 111 in the first direction form a second cell group 1102. At least two battery cells on the outermost side at any one end of the second cell group 1102 in the second direction may be provided with a heat preservation member 12; alternatively, a plurality of battery cells of the second cell group 1102 may all be provided with a heat preservation member 12.

[0090] In this embodiment, a plurality of battery cells on the outermost side at any one end of the battery cell assembly 111 in the first direction form a second cell group 1102. Specifically, the battery cells on the outermost side at the same end of a plurality of battery cell assemblies 111 arranged along the second direction in the first direction may form a second cell group 1102, and then second cell groups 1102 are formed at both ends of the battery cell group 11 in the first direction.

[0091] At least two battery cells on the outermost side at any one end of the second cell group 1102 in the second direction are provided with a heat preservation member 12. With reference to Figure 9 as shown, heat preservation members 12 may be provided for at least two battery cells at each corner position in the battery cell group 11. For example, two, three, four, etc. battery cells arranged in sequence along the second direction at each corner position may be provided with heat preservation members 12 on one side in the third direction.

[0092] In this embodiment, a plurality of battery cells of the second cell group 1102 may all be provided with a heat preservation member 12. With reference to Figure 10 as shown, a plurality of battery cells arranged in sequence along the second direction in the second cell group 1102 may all be provided with a heat preservation member 12.

[0093] In this embodiment, providing heat preservation members 12 for at least two battery cells on the outermost side at any one end of the second cell group 1102 in the second direction or providing heat preservation members 12 for a plurality of battery cells of the second cell group 1102 can further increase the number and range of battery cells insulated by the heat preservation member 12, make the arrangement of the heat preservation member 12 more flexible, can well improve the heat preservation effect of the heat preservation member 12 on the battery cells, and can well improve the overall heat preservation performance of the battery cell group 11, so as to better meet the heat preservation requirements of the battery device 10.

[0094] In some embodiments of the present invention, with reference to Figure 6 、 Figure 9 and Figure 13As shown, the battery device 10 may further include a partition beam 131. The partition beam 131 extends in the second direction. A plurality of battery cells of the battery cell group 11 are respectively arranged on both sides of the partition beam 131. The battery cell assemblies 111 at both ends of the battery cell group 11 in the second direction are the first cell groups 1101. In the first cell group 1101, heat preservation members 12 may be provided on both battery cells located on both sides of the partition beam 131.

[0095] In this embodiment, the battery device 10 includes a partition beam 131. Exemplarily, the partition beam 131 may be a part of the box body 13 structure. The partition beam 131 extends in the second direction and can divide the accommodation cavity of the box body 13 for accommodating the battery cell group 11 into two chambers arranged in the first direction. Then, the battery cell group 11 can be divided into two parts by the partition beam 131, and a plurality of battery cells of the battery cell group 11 are respectively arranged on both sides of the partition beam 131.

[0096] Heat preservation members 12 are provided on both battery cells of the first cell group 1101 of the battery cell group 11 located on both sides of the partition beam 131. Refer to Figure 13 As shown, heat preservation members 12 may be provided on the battery cells at both ends of each first cell group 1101 in the first direction and the two battery cells adjacent to the partition beam 131. Exemplarily, when the number of partition members is multiple, heat preservation members 12 may be provided on both battery cells on both sides of each partition member in the first cell group 1101. Exemplarily, when the partition member extends in the first direction, heat preservation members 12 may also be provided on the battery cells of the second cell group 1102 located on both sides of the partition member in the second direction.

[0097] It can be understood that after the partition beam 131 divides the battery cell group 11, the exposed area of the battery cells adjacent to the partition beam 131 increases and the heat dissipation path shortens, and the heat loss rate increases, thus forming a weak area with a large heat loss in the new battery cell group 11. In this embodiment, heat preservation members 12 are provided on the battery cells adjacent to the partition beam 131 in the first cell group 1101, which can well reduce the influence of the relatively fast temperature decay of the battery cells at the partition beam 131 on the overall heat preservation performance of the battery cell group 11, so that the overall heat preservation performance of the battery cell group 11 is well maintained.

[0098] In some embodiments of the present invention, the heat preservation member 12 may be a foamed member.

[0099] In this embodiment, the heat preservation member 12 is set as a foamed member. The foamed member has characteristics such as a low thermal conductivity coefficient, a closed pore structure, good dimensional stability, good water resistance and weather resistance, and light weight.

[0100] In this embodiment, the heat insulation member 12 is set as a foamed member, so that the heat insulation member 12 can play a good heat insulation role and well meet the heat insulation needs of the battery cell group 11.

[0101] In an embodiment of the present invention, the foamed member can be a polypropylene member, or the foamed member can be a polyethylene member.

[0102] In this embodiment, the foamed member is a polypropylene member. For example, the foamed member can be a polypropylene microcellular foamed member, and the foamed member can also be a polyethylene member. For example, the foamed member can be an electron beam irradiated crosslinked foamed polyethylene member.

[0103] In this embodiment, setting the foamed member as a polypropylene member or a polyethylene member can well meet the heat insulation needs of the battery cell group 11 for the heat insulation member 12, so that the foamed member can flexibly set specific material members according to heat insulation needs and assembly needs, etc.

[0104] In some embodiments of the present invention, the heat insulation member 12 can be a vacuum insulation member.

[0105] In this embodiment, the heat insulation member 12 is set as a vacuum insulation member. The vacuum insulation member has characteristics such as a low thermal conductivity coefficient and excellent heat insulation performance. For example, the heat insulation member 12 can be a vacuum insulation panel.

[0106] In this embodiment, setting the heat insulation member 12 as a vacuum insulation member can well meet the heat insulation needs of the battery cell group 11.

[0107] In some embodiments of the present invention, referring to Figure 4 and Figure 5 as shown, the battery device 10 may further include: a heat exchange plate 14 and a thermal conductive adhesive. The heat exchange plate 14 is disposed on one side of the battery cell group 11 in the third direction. The battery cell group 11 is connected to the heat exchange plate 14 through the thermal conductive adhesive. Wherein, the heat insulation member 12 is disposed between the first battery cell 1111 and the thermal conductive adhesive, or the heat insulation member 12 is disposed between the thermal conductive adhesive and the heat exchange plate 14.

[0108] In this embodiment, the battery device 10 further includes a heat exchange plate 14 and a thermal conductive adhesive. The heat exchange plate 14 is disposed on the side of the battery cell group 11 in the third direction where the heat insulation member 12 is located. Exemplarily, the heat exchange plate 14 can be a liquid cooling plate. The heat exchange plate 14 is adhesively connected to multiple battery cells of the battery cell group 11 through the thermal conductive adhesive. When the battery device 10 is cooled, the heat in the battery cells can be heat exchanged and cooled through the thermal conductive adhesive and the heat exchange plate 14. When the battery device 10 is heated, the heat can be transferred from the heat exchange plate 14 to the battery cells through the thermal conductive adhesive to heat the battery cells.

[0109] In this embodiment, the heat insulation member 12 is disposed between the first battery cell 1111 and the thermal conductive adhesive, or between the thermal conductive adhesive and the heat exchange plate 14. During the assembly process of the heat insulation member 12 with the battery cell group 11 and the heat exchange plate 14, the heat insulation member 12 can be assembled and arranged with the battery cells first and then fixedly assembled with the heat exchange plate 14 through the thermal conductive adhesive as a whole, or the heat insulation member 12 can be first disposed on the heat exchange plate 14, then the heat exchange plate 14 is coated with the thermal conductive adhesive as a whole, and then assembled with the battery cell group 11. Of course, between the battery cell and the heat exchange plate 14, the thermal conductive adhesive may not be provided in the area covered by the heat insulation member 12. The assembly of the heat insulation member 12 with the heat exchange plate 14 and the thermal conductive adhesive can be flexibly set according to actual assembly requirements to meet the needs of rapid assembly of the battery device 10.

[0110] In this embodiment, the heat insulation member 12 is disposed between the first battery cell 1111 and the thermal conductive adhesive, or between the thermal conductive adhesive and the heat exchange plate 14, which has a simple structure and is convenient for the assembly and arrangement of the heat insulation member 12 with the battery cell group 11 and the heat exchange plate 14, making the arrangement of the heat insulation member 12 with the battery cell group 11 relatively flexible and convenient.

[0111] In an embodiment of the present invention, the heat insulation member 12 can be adhesively fixed to the first battery cell 1111, or the heat insulation member 12 can be adhesively fixed to the heat exchange plate 14.

[0112] In this embodiment, the heat insulation member 12 is adhesively fixed to the first battery cell 1111 or the heat exchange plate 14. During the assembly of the battery device 10, the heat insulation member 12 can be adhesively fixed to the first battery cell 1111 of the battery cell group 11 in advance and then assembled onto the heat exchange plate 14 as a whole, or the heat insulation member 12 can be adhesively fixed in advance to a preset position on the heat exchange plate 14 corresponding to the first battery cell 1111, and then the battery cell group 11 is assembled onto the heat exchange plate 14.

[0113] In this embodiment, the heat insulation member 12 is adhesively fixed to the first battery cell 1111 or the heat exchange plate 14, which has a simple structure, is convenient and reliable for fixing, and can make the assembly and fixation of the heat insulation member 12 with the battery cell relatively convenient and fast.

[0114] In some embodiments of the present invention, referring to Figures 14 - 22 , one side surface of the first battery cell 1111 facing the heat insulation member 12 is formed as a heat insulation surface, and the projection of the heat insulation member 12 on the heat insulation surface is at least one of a rectangle, a triangle, an annulus, or a cross.

[0115] In this embodiment, the projection of the heat insulation member 12 on the heat insulation surface is set as at least one of a rectangle, a triangle, an annulus or a cross. For example, the projection of the heat insulation member 12 on the heat insulation surface can be a rectangle, and the length dimension, width dimension, length direction, width direction, etc. of the rectangle can be reasonably set according to the heat insulation requirements. The projection of the heat insulation member 12 on the heat insulation surface can also be a triangle, an annulus or a cross, etc. The projection of the heat insulation member 12 on the heat insulation surface can also be a shape composed of two, three or four shapes such as a rectangle, a triangle, an annulus and a cross. The projection shape, size, etc. of the heat insulation member 12 on the heat insulation surface can be correspondingly set according to needs.

[0116] In this embodiment, setting the projection of the heat insulation member 12 on the heat insulation surface as at least one of a rectangle, a triangle, an annulus or a cross enables the shape, size, etc. of the heat insulation member 12 to be flexibly and conveniently set according to needs.

[0117] In one embodiment of the present invention, referring to Figure 20 , Figure 21 and Figure 22 shown, with the diagonal of the heat insulation surface as the boundary, or with the midline of the heat insulation surface in the first direction or the second direction as the boundary, half of the heat insulation surface is covered with the heat insulation member 12.

[0118] In this embodiment, half of the heat insulation surface is covered with the heat insulation member 12. When the heat insulation surface is bounded by the diagonal, the projection of the heat insulation member 12 on the heat insulation surface can be a right triangle. When the heat insulation surface is bounded by the midline in the first direction or the second direction, the projection of the heat insulation member 12 on the heat insulation surface is a rectangle.

[0119] In this embodiment, with the diagonal of the heat insulation surface, the midline in the first direction or the second direction as the boundary, the projection of the heat insulation member 12 on the heat insulation surface of the first battery cell 1111 is set to cover half of the heat insulation surface, so that the heat insulation surface of the first battery cell 1111 has a relatively large heat insulation cooperation area and heat dissipation area, which can well meet the heat insulation and heat dissipation needs of the first battery cell 1111.

[0120] In one embodiment of the present invention, referring to Figures 15 - 19 shown, the projection of the heat insulation member 12 on the heat insulation surface is a rectangle. In the first direction or the second direction, the heat insulation member 12 is arranged in the middle of the heat insulation surface and extends to both side edges of the heat insulation surface, or the projection of the heat insulation member 12 on the heat insulation surface is spaced from the edge of the heat insulation surface.

[0121] In this embodiment, the projection of the heat insulation member 12 on the heat insulation surface is a rectangle and is arranged in the middle of the heat insulation surface in the first direction or the second direction. The projection of the heat insulation member 12 on the heat insulation surface can extend to both side edges of the heat insulation surface. For example Figure 18As shown, the projection of the heat insulation member 12 on the heat insulation surface can extend along the first direction to the edge of the heat insulation surface, or as Figure 19 shown, the projection of the heat insulation member 12 on the heat insulation surface can extend along the second direction to the edge of the heat insulation surface. Refer to Figure 17 shown, when a plurality of sub-heat insulation members are arranged at the heat insulation surface of the first battery cell 1111, for example, when two sub-heat insulation members are fitted on the heat insulation surface, the two sub-heat insulation members can be arranged at intervals in the second direction and both extend along the first direction to the two side edges of the heat insulation surface.

[0122] In this embodiment, the projection of the heat insulation member 12 on the heat insulation surface is spaced from the edge of the heat insulation surface. Refer to Figure 15 and Figure 16 shown, the projection of the heat insulation member 12 on the heat insulation surface does not extend to the two side edges of the heat insulation surface in both the first direction and the second direction.

[0123] In this embodiment, arranging the heat insulation member 12 in the middle of the heat insulation surface and extending it to the two side edges of the heat insulation surface or setting the projection of the heat insulation member 12 on the heat insulation surface to be spaced from the edge of the heat insulation surface can make the arrangement of the heat insulation member 12 and the first battery cell 1111 more flexible and changeable, so that the heat insulation member 12 can be more flexibly and conveniently arranged with the battery cell group as needed.

[0124] In an embodiment of the present invention, refer to Figure 14 shown, the projection of the heat insulation member 12 on the heat insulation surface can extend in a ring shape along the circumferential direction of the heat insulation surface, and the outer peripheral edge of the projection of the heat insulation member 12 is flush with the outer peripheral edge of the heat insulation surface.

[0125] In this embodiment, the projection of the heat insulation member 12 on the heat insulation surface is set to be ring-shaped, and the outer peripheral edge of the projection of the heat insulation member 12 is flush with the outer peripheral edge of the heat insulation surface. Then, when the heat insulation member 12 is assembled with the battery cell group, the first battery cell 1111 can be adhesively fixed to the heat exchange plate 14 through the part of the heat insulation member 12 leaking out from the middle of the heat insulation member 12 for heat dissipation, and the heat insulation surface surrounds the heat dissipation part of the first battery cell 1111 for heat insulation.

[0126] In this embodiment, setting the projection of the heat insulation member 12 on the heat insulation surface to extend in a ring shape along the circumferential direction of the heat insulation surface and the outer peripheral edge of the projection of the heat insulation member 12 to be flush with the outer peripheral edge of the heat insulation surface has a simple structure and can well meet the heat insulation and heat dissipation needs of the first battery cell 1111.

[0127] Next, refer to Figures 1 - 22 to describe the energy storage device according to the embodiment of the second aspect of the present invention.

[0128] As Figures 1 - 22 shown, the energy storage device according to the embodiment of the present invention includes the battery device 10 according to the embodiment of the first aspect of the present invention.

[0129] An embodiment of the present invention provides an energy storage device, which includes one or more battery clusters to increase the voltage and capacity of the energy storage device. The battery cluster may include a plurality of battery devices 10, and the plurality of battery devices 10 are connected in series through a busbar component to increase the voltage of the energy storage device. When the energy storage device includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0130] The energy storage device can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. The energy storage device can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device can store electrical energy during low electricity consumption periods and provide electrical energy to relevant users or electrical equipment during high electricity consumption periods. The energy storage system provided by the embodiment of the present invention can be any power system that requires an energy storage device.

[0131] In some embodiments of the present invention, the energy storage device is an energy storage container or an energy storage cabinet.

[0132] In some embodiments of the present invention, the energy storage device may include a cabinet body and one or more battery clusters, and the battery clusters are accommodated in the cabinet body.

[0133] In some embodiments of the present invention, the energy storage device may include modules such as a thermal management module, a main control module, a total control module, a power distribution module, and a fire protection module.

[0134] As an example, the thermal management module may include a liquid cooling unit, and the liquid cooling unit provides coolant for adjusting the temperature of battery cells to each battery device 10 through pipelines.

[0135] As an example, the main control module can be used as the battery management unit of the battery cluster to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For example, it can control the charge and discharge current, voltage, etc. of the battery cluster. The main control module includes modules such as an auxiliary battery management unit and a fusion switch.

[0136] As an example, the total control module can be used as the battery management unit of the energy storage device to monitor and manage the energy storage device. The total control module can monitor information such as the current, voltage, power, state of charge, or temperature of the energy storage device. For example, it can control the charge and discharge current, voltage, etc. of the energy storage device. As an example, the total control module includes modules such as an insulation monitoring module, a main battery management unit, an Ethernet and fiber optic conversion module.

[0137] As an example, the fire protection system includes a control panel, detectors, alarm devices, etc., and is used to detect, alarm, or extinguish fires in the energy storage system.

[0138] As an example, the power distribution device can be used to distribute power to the power consumption modules of the energy storage device.

[0139] Other configurations and operations of the energy storage device according to the embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

[0140] For the energy storage device according to the embodiments of the present invention, by providing the battery device 10 of the first aspect embodiment described above, and by providing the heat preservation member 12 which is configured to heat-preserve a part of the plurality of battery cells, the structure is simple and the layout is reasonable. Through targeted heat preservation of the battery cells, the amount of the heat preservation member 12 can be reduced while meeting the heat preservation requirements, thereby well reducing the heat preservation cost of the battery device 10. At the same time, the plurality of sub-heat preservation members of the heat preservation member 12 are arranged in one-to-one correspondence with the plurality of first battery cells 1111 that need to be heat-preserved, with less usage of the heat preservation member 12, making it more flexible and convenient to assemble and arrange the heat preservation member 12 with the battery cell group 11.

[0141] Next, reference will be made to Figures 1 - 22 Describe the electrical device 100 according to the third aspect embodiment of the present invention.

[0142] As Figures 1 - 22 shown, the electrical device 100 according to the embodiments of the present invention includes the battery device 10 according to the first aspect embodiment of the present invention or the energy storage device according to the second aspect embodiment of the present invention.

[0143] Other configurations and operations of the electrical device 100 according to the embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

[0144] For the electrical device 100 according to the embodiments of the present invention, by providing the battery device 10 of the first aspect embodiment described above or the energy storage device of the second aspect embodiment, and by providing the heat preservation member 12 which is configured to heat-preserve a part of the plurality of battery cells, the structure is simple and the layout is reasonable. Through targeted heat preservation of the battery cells, the amount of the heat preservation member 12 can be reduced while meeting the heat preservation requirements, thereby well reducing the heat preservation cost of the battery device 10. At the same time, the plurality of sub-heat preservation members of the heat preservation member 12 are arranged in one-to-one correspondence with the plurality of first battery cells 1111 that need to be heat-preserved, with less usage of the heat preservation member 12, making it more flexible and convenient to assemble and arrange the heat preservation member 12 with the battery cell group 11.

[0145] Next, reference will be made to Figures 1 - 22 Describe the electrical device 100 according to a specific embodiment of the present invention.

[0146] As Figure 1As shown, the electrical device 100 is a vehicle. The electrical device 100 includes a motor 20, a controller 30, and a battery device 10. The controller 30 is used to control the battery device 10 to supply power to the motor 20.

[0147] The battery device 10 includes a box body 13, a heat exchange plate 14, and a battery cell group 11. The box body 13 has a frame, an expansion beam, a partition beam 131, and a bottom guard plate. The frame, the expansion beam, and the bottom guard plate can cooperate to form a receiving cavity for receiving the battery cell group 11. The partition beam 131 extends in the second direction and divides the receiving cavity into two cavities. The battery cell group 11 is arranged in the two cavities. The heat exchange plate 14 is disposed at the bottom of the receiving cavity. The battery cell group 11 and the heat exchange plate 14 are assembled and fixed through a thermal conductive adhesive. The battery cell group 11 includes six battery cell assemblies 111 and a heat preservation member 12. The six battery cell assemblies 111 are arranged in sequence in the second direction, and the battery cell assemblies 111 are stacked in the first direction.

[0148] In this embodiment, a part of the battery cells in the battery cell group 11 are set as the first battery cells 1111. The first battery cells 1111 can be determined according to the heat preservation needs through simulation. The heat preservation member 12 is adhesively fixed to one surface of the first battery cells 1111 in the third direction. One surface of the first battery cells 1111 facing the heat preservation member 12 forms a heat preservation surface. Exemplarily, referring to Figure 9 and Figure 10 as shown, in the first direction, the battery cells arranged at both ends of the battery cell group 11 in the second direction, and the two battery cells at both ends in the first direction in the battery cell assemblies 111 at both ends in the second direction form the first battery cells 1111; referring to Figure 11 as shown, the two battery cells at both ends in the first direction in the battery cell assemblies 111 at both ends in the second direction form the first battery cells 1111; referring to Figure 12 as shown, the two battery cells at both ends in the first direction in the battery cell assemblies 111 at both ends in the second direction, and the two battery cells at both ends in the second direction among the battery cells arranged at both ends of the battery cell group 11 in the first direction in the second direction form the first battery cells 1111; referring to Figure 13 as shown, in another embodiment of the present invention, the battery device 10 further includes a partition beam 131. The partition beam 131 extends in the second direction. The battery cells of the battery cell group 11 are separated on both sides of the partition beam 131. Then, the two battery cells at both ends in the first direction in the battery cell assemblies 111 at both ends in the second direction, the two battery cells located on both sides of the partition plate, and the two battery cells at both ends in the second direction among the battery cells arranged at both ends of the battery cell group 11 in the first direction in the second direction form the first battery cells 1111.

[0149] Referring toFigures 14 - 22 As shown, the heat preservation member 12 includes a plurality of sub-heat preservation members, and the sub-heat preservation members are arranged in one-to-one correspondence with the first battery cells 1111. The shape of the sub-heat preservation members can be annular, strip-shaped, triangular, etc. The area of the heat preservation surface not covered by the sub-heat preservation members is used for heat exchange during cooling or heating. Refer to Figure 14 As shown, an annular heat preservation member matching the heat preservation surface is attached to the heat preservation surface, and the middle area is used for cooling. Refer to Figure 15 As shown, a rectangular heat preservation member is attached to the middle area of the heat preservation surface, and the peripheral area of the rectangular heat preservation member is used for cooling. Refer to Figure 16 As shown, the sub-heat preservation member can be composed of two separated heat preservation parts. Two rectangular heat preservation parts can be attached to the heat preservation surface, and the remaining area is used for cooling. Refer to Figure 17 As shown, the sub-heat preservation member can extend to the edge of the heat preservation surface in the width direction of the first battery cell. Refer to Figure 18 and Figure 19 As shown, a sub-heat preservation member is attached to the heat preservation surface. The sub-heat preservation member extends to the edge of the heat preservation surface in the length direction of the first battery cell 1111 and is centered. Refer to Figure 20 , Figure 21 and Figure 22 As shown, the sub-heat preservation member extends to the edge of the heat preservation surface in the width direction of the first battery cell 1111 and is centered, or extends to the edge of the heat preservation surface in the length direction of the first battery cell 1111 and covers half of the heat preservation surface area, or the heat preservation surface is bounded by a diagonal line, and any half of it is attached with a sub-heat preservation member, or the sub-heat preservation member extends to the edge of the heat preservation surface in the width direction of the first battery cell 1111 and covers half of the heat preservation surface area, and other arrangement forms, etc. The size of the sub-heat preservation member and its arrangement on the heat preservation surface of the first battery cell 1111 can be flexibly arranged according to needs.

[0150] In this embodiment, by using the heat preservation member 12 to insulate a part of the battery cells among the multiple battery cells, a differential heat preservation strategy can be adopted for the multiple battery cells in the battery cell group 11. The heat preservation of the battery cells can be targeted in combination with the heat dissipation conditions of the battery cells at different positions in the battery device 10, so that the arrangement of the heat preservation member 12 can be concentrated in the weak area with the largest heat loss, improving the heat preservation ability of the battery cells in this area. Thus, the overall heat preservation performance of the battery cell group 11 can be maintained, and the arrangement of the heat preservation member 12 in the non-essential area in the arrangement area of the battery cells can be reduced, thereby saving the usage amount of the heat preservation member 12 well and reducing the heat preservation cost of the battery device 10 well. At the same time, the multiple sub-heat preservation members of the heat preservation member 12 are arranged in one-to-one correspondence with the multiple first battery cells 1111 that need to be insulated, cooperating with the smaller usage amount of the heat preservation member 12, making the heat preservation member 12 more flexible and convenient when assembled and arranged with the battery cell group 11.

[0151] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that, Comprising: A battery cell group (11), the battery cell group (11) comprising a plurality of battery cells, and the plurality of battery cells being stacked and arranged in a first direction and / or a second direction; A heat preservation member (12), the heat preservation member (12) being disposed on one side of the battery cell group (11) in a third direction, the third direction intersecting the second direction and the first direction pairwise, the heat preservation member (12) being configured to heat-insulate a part of the plurality of battery cells, and the battery cells heat-insulated by the heat preservation member (12) being first battery cells (1111). In a projection plane parallel to the first direction and the second direction, the plurality of first battery cells (1111) are at least arranged at four corner positions of the battery cell group (11), and the heat preservation member (12) comprises a plurality of sub-heat preservation members, and the plurality of sub-heat preservation members are arranged in one-to-one correspondence with the plurality of first battery cells (1111).

2. The battery device according to claim 1, characterized in that, One side surface of the first battery cell (1111) facing the heat preservation member (12) is formed as a heat-insulating surface, and the ratio of the projection of the heat preservation member (12) on the heat-insulating surface to the area of the heat-insulating surface is greater than or equal to 30% and less than or equal to 70%.

3. The battery device according to claim 2, characterized in that, The ratio of the projection of the heat preservation member (12) on the heat-insulating surface to the area of the heat-insulating surface is greater than or equal to 30% and less than or equal to 50%.

4. The battery device according to any one of claims 1 to 3, characterized in that The heat preservation member (12) is provided on the battery cells at both ends in the first direction and / or the second direction.

5. The battery device according to any one of claims 1 to 3, characterized in that, The plurality of battery cells are stacked and arranged in the first direction to form a battery cell assembly (111), the first direction being the thickness direction of the battery cell, the number of the battery cell assemblies (111) being a plurality, and the plurality of battery cell assemblies (111) being sequentially arranged in the second direction, the second direction being the length direction of the battery cell.

6. The battery device according to claim 5, characterized in that, A plurality of the outermost battery cells at any one end of the battery cell assembly (111) in the first direction form a second cell group (1102), and the heat preservation member (12) is provided on at least two of the outermost battery cells at any one end of the second cell group (1102) in the second direction; or, the heat preservation member (12) is provided on all of the plurality of battery cells of the second cell group (1102).

7. The battery device according to claim 5, wherein The battery device further comprises a partition beam (131), the partition beam (131) extending in the second direction, the plurality of battery cells of the battery cell group (11) being respectively arranged on both sides of the partition beam (131), and the battery cell assemblies (111) at both ends of the battery cell group (11) in the second direction being first cell groups (1101). In the first cell group (1101), the heat preservation member (12) is provided on both of the two battery cells located on both sides of the partition beam (131).

8. The battery device according to any one of claims 1 to 3, characterized in that, The heat preservation member (12) is a foamed member.

9. The battery device according to claim 8, characterized in that, The foamed member is a polypropylene member, or the foamed member is a polyethylene member.

10. The battery device according to any one of claims 1-3, characterized in that, The heat preservation member (12) is a vacuum insulation member.

11. The battery device according to any one of claims 1-3, characterized in that, The battery device further includes: a heat exchange plate (14) and a thermal conductive adhesive. The heat exchange plate (14) is disposed on one side of the battery cell group (11) in the third direction, and the battery cell group (11) is connected to the heat exchange plate (14) through the thermal conductive adhesive. Wherein, the heat insulation member (12) is disposed between the first battery cell (1111) and the thermal conductive adhesive, or the heat insulation member (12) is disposed between the thermal conductive adhesive and the heat exchange plate (14).

12. The battery device according to claim 11, characterized in that, The heat insulation member (12) is adhesively fixed to the first battery cell (1111), or the heat insulation member (12) is adhesively fixed to the heat exchange plate (14).

13. The battery device according to any one of claims 1 to 3, characterized in that, One side surface of the first battery cell (1111) facing the heat insulation member (12) is formed as a heat insulation surface, and the projection of the heat insulation member (12) on the heat insulation surface is at least one of a rectangle, a triangle, an annulus or a cross.

14. The battery device according to claim 13, characterized in that, Taking the diagonal of the heat insulation surface as a boundary, or taking the midline of the heat insulation surface in the first direction or the second direction as a boundary, half of the heat insulation surface is covered with the heat insulation member (12).

15. The battery device according to claim 13, characterized in that, The projection of the heat insulation member (12) on the heat insulation surface is a rectangle. In the first direction or the second direction, the heat insulation member (12) is arranged in the middle of the heat insulation surface and extends to both side edges of the heat insulation surface, or the projection of the heat insulation member on the heat insulation surface is spaced from the edge of the heat insulation surface.

16. The battery device according to claim 13, characterized in that, The projection of the heat insulation member (12) on the heat insulation surface extends along the circumferential direction of the heat insulation surface to form an annulus, and the outer peripheral edge of the projection of the heat insulation member is flush with the outer peripheral edge of the heat insulation surface.

17. An energy storage device, characterized in that, Including the battery device according to any one of claims 1-16, the battery device is used for storing or providing electric energy.

18. An electrical device, characterized in that, Including the battery device according to any one of claims 1-16 or the energy storage device according to claim 17, the battery device is used for storing or providing electric energy.

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