Battery device and heat insulation assembly

Abstract

The utility model relates to a battery device and a heat insulation assembly. The battery device at least comprises a first battery cell group and a second battery cell group which are arranged along a first direction, each of the first battery cell group and the second battery cell group comprises a plurality of battery cells arranged along a second direction, and the second direction intersects with the first direction; wherein a heat insulation assembly is arranged between the first battery cell group and the second battery cell group, the heat insulation assembly comprises a first heat insulation piece and a plurality of second heat insulation pieces, the plurality of second heat insulation pieces are arranged on one side of the first heat insulation piece along the first direction, and the plurality of second heat insulation pieces are distributed at intervals along the second direction. The heat insulation assembly can block heat transfer between the first battery cell group and the second battery cell group, so that the risk of thermal runaway of the battery device is reduced.

Description

Technical Field

[0001] This specification relates to the field of batteries, and in particular to a battery device and a heat insulation component. Background Technology

[0002] With increasing market demand for batteries, the requirements for battery capacity and energy density are constantly rising. Traditional single-row cells can no longer meet these demands, necessitating the design of dual-row or multi-row cell configurations to maximize space utilization and increase battery energy density. However, heat transfer between adjacent rows of cells can lead to thermal runaway in one row affecting the adjacent row.

[0003] Therefore, it is necessary to provide a battery device and a heat insulation component to block heat transfer between two adjacent rows of cells and reduce the risk of thermal runaway in the battery device. Utility Model Content

[0004] Based on this, this application provides a battery device and a heat insulation component to block heat transfer between two adjacent rows of battery cells, thereby reducing the risk of thermal runaway in the battery device.

[0005] In a first aspect, this application provides a battery device, which includes at least a first cell group and a second cell group arranged along a first direction. Both the first and second cell groups include a plurality of cells arranged along a second direction, which intersects the first direction. A heat insulation component is provided between the first and second cell groups. The heat insulation component includes a first heat insulation element and a plurality of second heat insulation elements. The plurality of second heat insulation elements are disposed on one side of the first heat insulation element along the first direction and are spaced apart along the second direction. The heat insulation component can block heat transfer between the first and second cell groups, reducing the risk of thermal runaway in the battery device.

[0006] In some embodiments, the first thermal insulation component has at least one deformation zone along the second direction. The design of the deformation zone allows the thermal insulation component to be adapted to the arrangement and overall length of multiple cells in the first and / or second battery cell groups before and after encapsulation, ensuring the connection between the thermal insulation component and the battery cells. This facilitates the installation of the thermal insulation component while guaranteeing its thermal insulation performance after encapsulation.

[0007] In some embodiments, the thermal insulation assembly is connected to the side of a cell in the first cell group via a plurality of second thermal insulation members, and the thermal insulation assembly is connected to the side of a cell in the second cell group via the other side of the first thermal insulation member behind the plurality of second thermal insulation members. At least one deformation zone is located between two adjacent second thermal insulation members. With the above arrangement, the interference of the second thermal insulation members with the deformation zone of the first thermal insulation member can be avoided.

[0008] In some embodiments, a first heat insulation member has a plurality of first connection areas on one side along a first direction, and a plurality of second connection areas on the other side along the first direction. Each first connection area is connected to a second heat insulation member, each second heat insulation member is connected to a cell side of a first cell group, and each second connection area is connected to a cell side of a second cell group. At least one deformation area includes a wrinkled area on the first heat insulation member located between two adjacent first connection areas and / or two adjacent second connection areas. This configuration avoids interference between connection areas on the first heat insulation member, making it easier for relevant areas on the first heat insulation member (such as areas between adjacent connection areas) to undergo effective deformation and form wrinkled areas.

[0009] In some embodiments, a plurality of second heat insulation members are connected one-to-one with the sides of a plurality of cells in the first cell group; in the second direction, the width of the second heat insulation member is smaller than the width of the side of the cell. By designing the width of the second heat insulation member, sufficient folded area is left between two adjacent second heat insulation members, while avoiding collision interference between two adjacent second heat insulation members, which would prevent the cells connected by the two adjacent second heat insulation members from continuing to move and affect the encapsulation effect.

[0010] In some embodiments, in the first direction, the ratio of the thickness of the first heat insulation component to the thickness of the second heat insulation component is no more than 0.5, so that the thickness of the first heat insulation component is appropriate, while the thickness of the second heat insulation component is relatively thick to ensure the heat insulation effect, and the overall thickness of the heat insulation component is appropriate, so as to avoid the excessive thickness of the heat insulation component affecting the encapsulation effect of the battery cell.

[0011] In some embodiments, in the first direction, the thickness of the first heat insulation element is 0.1mm-0.5mm, so that the thickness of the first heat insulation element is appropriate, avoiding the difficulty of deformation of the first heat insulation element due to excessive thickness, and avoiding the first heat insulation element being easily damaged during deformation due to excessively thin thickness.

[0012] In some embodiments, in the third direction, the height of the heat insulation component is not higher than the height of the battery cell; in the third direction, the distance between the top of the heat insulation component and the top edge of the side of the battery cell is 0mm-5mm; and / or, in the third direction, the distance between the bottom of the heat insulation component and the bottom edge of the side of the battery cell is 0mm-5mm, and the third direction intersects the plane containing the first direction and the second direction. Setting the height of the heat insulation component to be no higher than the height of the battery cell avoids the heat insulation component affecting the battery cell's encapsulation. Setting the distance between the top and / or bottom of the heat insulation component and the corresponding top and / or bottom edge of the side of the battery cell ensures that the height of the heat insulation component is close to the height of the battery cell, guaranteeing both the heat insulation area of ​​the battery cell and the heat insulation effect of the heat insulation component.

[0013] Secondly, this application provides another battery device, which includes a first end plate, a second end plate, and two or more cell groups arranged along a first direction. Each cell group includes multiple cells arranged along a second direction, which intersects the first direction. A heat insulation component is provided between adjacent cell groups. The heat insulation component includes a first heat insulation element and multiple second heat insulation elements. The multiple second heat insulation elements are disposed on one side of the first heat insulation element along the first direction and are spaced apart along the second direction. The first end plate is disposed at one end of the two or more cell groups along the second direction, and the second end plate is disposed at the other end of the two or more cell groups along the second direction. The heat insulation component can block heat transfer between the first cell group and the second cell group, reducing the risk of thermal runaway of the battery device. The structure of multiple cell groups sharing an end plate facilitates the assembly of the battery device.

[0014] Thirdly, this application provides a heat insulation component, which includes a first heat insulation element and a plurality of second heat insulation elements. The plurality of second heat insulation elements are spaced apart along a fourth direction on one side of the first heat insulation element. The thickness of the first heat insulation element is less than the thickness of the second heat insulation elements. In the fourth direction, the distance between two adjacent second heat insulation elements is 2mm-10mm. The thinner first heat insulation element is more prone to deformation, while the thicker second heat insulation elements provide better heat insulation, thereby enabling the heat insulation component to better adapt to the displacement of the battery cell before and after packaging. At the same time, the aforementioned distance setting can prevent collision interference between two adjacent second heat insulation elements during installation, while ensuring that the first heat insulation element between two adjacent second heat insulation elements has a sufficient deformation area to guarantee the deformation capability of the first heat insulation element. Attached Figure Description

[0015] This specification will be further described by way of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting; in these embodiments, the same reference numerals denote the same structures, wherein:

[0016] Figure 1 This is a schematic diagram of the structure of a battery device according to one or more embodiments;

[0017] Figure 2 This is a schematic diagram of the structure of a thermal insulation component according to one or more embodiments;

[0018] Figure 3 This is a structural schematic diagram of multiple battery cells before they are assembled according to one or more embodiments;

[0019] Figure 4 This is a schematic diagram of the structure of multiple battery cells grouped together according to one or more embodiments;

[0020] Figure 5This is another structural schematic diagram of a battery device according to one or more embodiments;

[0021] Figure 6 This is another structural schematic diagram of a thermal insulation component according to one or more embodiments;

[0022] Figure 7 yes Figure 6 A schematic diagram of the thermal insulation component from another perspective is shown;

[0023] Figure 8 This is a schematic diagram showing the connection between the second heat insulation element and the side of the battery cell according to one or more embodiments;

[0024] Figure 9 This is another structural schematic diagram of a thermal insulation component according to one or more embodiments.

[0025] Explanation of reference numerals in the attached drawings: 10, battery assembly; 100, first cell group; 110, cell; 120, heat insulation pad; 130, busbar; 140, insulating cover; 150, end plate; 200, second cell group; 300, heat insulation component; 330, double-sided adhesive; 340, first heat insulation component; 350, second heat insulation component. Detailed Implementation

[0026] The accompanying drawings used in the description of the embodiments will be briefly introduced below. The drawings do not represent all embodiments.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0028] In the description of the embodiments of this application, technical terms such as "first," "second," "third," and "fourth" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, "multiple rows" means two or more rows, and "each" means each of the multiple, unless otherwise explicitly defined.

[0029] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0030] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0031] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0032] The technical solutions described in this application are applicable to various power supply devices (such as battery packs, battery modules, or battery devices) and their electrical devices that use multiple rows of battery cells. For example, the electrical devices can be mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0033] With increasing market demand for batteries, the requirements for battery capacity and energy density are constantly rising. Traditional single-row cells can no longer meet these demands, necessitating the design of dual-row or multi-row cell configurations to maximize space utilization and increase battery energy density. However, during battery operation, heat transfer between adjacent rows of cells can lead to thermal runaway in one row, potentially affecting the adjacent row.

[0034] To address this issue, some embodiments of this specification provide a battery device and a thermal insulation component. The battery device includes at least two rows of cells (e.g., a first cell group and a second cell group; in some embodiments, a cell may also be referred to as a battery cell) arranged along a first direction. By providing a thermal insulation component between adjacent rows of cells, heat transfer between adjacent rows of cells is blocked, reducing the risk of thermal runaway in the battery device.

[0035] Figure 1 This is a schematic diagram of the battery device according to one or more embodiments. Please refer to... Figure 1 The battery device 10 includes at least a first cell group 100 and a second cell group 200 arranged along a first direction, and each of the first cell group 100 and the second cell group 200 includes a plurality of cells 110 arranged along a second direction. A heat insulation component 300 is provided between the first cell group 100 and the second cell group 200. The heat insulation component 300 has good heat insulation performance, which can block heat transfer between the first cell group 100 and the second cell group 200, reduce the risk of thermal runaway of the battery device 10, and also maintain the operating temperature of the battery device 10 within a suitable range, thus extending its service life.

[0036] The second direction can be the thickness direction of the battery cell 110, that is, the direction corresponding to the two large surfaces of the battery cell 110; the first direction can be the direction corresponding to the two smaller side surfaces of the battery cell 110. In some embodiments, the second direction intersects with the first direction. For example, the angle between the second direction and the first direction is 70°-90°. Another example is that the angle can be 90°.

[0037] In some embodiments, the thermal insulation component 300 may include a first thermal insulation element (e.g., Figure 5 The first heat insulation element 340 shown) and a plurality of second heat insulation elements (e.g., Figure 5 As shown in the diagram, a plurality of second heat insulation elements are disposed on one side of the first heat insulation element along the first direction, and the plurality of second heat insulation elements are spaced apart along the second direction. By setting the first heat insulation element and the second heat insulation element, the thermal barrier effect between the first battery cell assembly and the second battery cell assembly is improved.

[0038] In some embodiments, the battery device 10 may further include other cell groups. For example, the battery device 10 may also include another cell group disposed adjacent to the first cell group 100 in a second direction, and a heat insulation pad 120 or a heat insulation component 300 may be disposed between the first cell group 100 and the other cell group. As another example, the battery device 10 may also include another cell group disposed adjacent to the first cell group 100 in a first direction, and this other cell group and the second cell group 200 are respectively located on opposite sides of the first cell group 100 in the first direction; a heat insulation component 300 may also be disposed between the other cell group and the first cell group 100.

[0039] In some embodiments, the battery device 10 may be constructed by encapsulating a plurality of battery cells 110, and the plurality of battery cells 110 may form at least a first battery cell group and a second battery cell group. In some embodiments, the battery device 10 may further include a connecting assembly and a supporting assembly. The connecting assembly is used to connect the battery cells 110, and may include the aforementioned fasteners (e.g., binding steel straps) and busbars 130 for electrically connecting the battery cells 110. The supporting assembly is used to protect and support the plurality of battery cells 110, and may include an insulating cover 140 with insulating properties and end plates 150 and side plates (not shown in the figure) as supports.

[0040] Figure 2 This is a schematic diagram of the structure of a thermal insulation component according to one or more embodiments.

[0041] Please refer to Figure 2 In some embodiments, the heat insulation component 300 may be an integral heat insulation plate, with its two sides in the first direction connected to the corresponding battery cell assembly via double-sided adhesive tape 330. In some embodiments, the length of the heat insulation plate in the second direction may be pre-designed, corresponding to the dimensions of the corresponding battery cell assembly after encapsulation. For example, for the first battery cell assembly 100 and / or the second battery cell assembly 200, the length of the heat insulation plate in the second direction can be determined by referring to the length of a battery cell assembly including the same number of battery cells 110 in the second direction, so that the heat insulation plate can correspond to the positions of the multiple battery cells 110 in the encapsulated first battery cell assembly 100 and the second battery cell assembly 200, ensuring that the heat insulation plate can block heat transfer between the battery cells of the first battery cell assembly 100 and the battery cells of the second battery cell assembly 200.

[0042] In some embodiments, the material and / or structure of the insulation panel may be the same as that of the insulation pad 120. In some embodiments, the insulation panel may be made of mica material.

[0043] It should be noted that, in order to avoid the heat insulation plate affecting the encapsulation of cell 110, the heat insulation plate can be placed in a preset position during the encapsulation process. After the cell 110 is encapsulated, the heat insulation plate is connected to the corresponding cell assembly on both sides in the first direction using double-sided adhesive tape 330.

[0044] Figure 3 This is a structural diagram of multiple battery cells before they are assembled according to one or more embodiments. Figure 4 This is a schematic diagram of the structure of multiple battery cells grouped together according to one or more embodiments.

[0045] Please refer to Figure 3 Taking a single row of battery cells (e.g., the first cell group 100) as an example, when multiple cells 110 are packaged into a group to form a battery pack or battery device 10, the multiple cells 110 are first arranged along the second direction, with a heat insulation pad 120 between adjacent cells 110. Before packaging, the spacing between adjacent cells 110 is relatively large to ensure installation space for the heat insulation pad 120. After the cells 110 and heat insulation pad 120 are arranged, fasteners (e.g., binding steel straps) are generally used to tighten the multiple cells 110 along the overall circumference, thereby binding the multiple cells 110 into a battery device 10, completing the packaging. The heat insulation pad 120 refers to a component with heat insulation properties, and the heat insulation pad 120 can achieve heat insulation through materials and / or structures. For example, the heat insulation material can include, but is not limited to, silicone-based composite heat insulation materials, fiberglass mat, etc., and the heat insulation structure can include, but is not limited to, honeycomb structures, porous foam structures, etc.

[0046] Please refer to Figure 4 After multiple battery cells 110 are packaged, the spacing between two adjacent battery cells 110 in the second direction becomes smaller, thereby reducing the volume of the battery device 10. And for Figure 1 The battery device 10 shown uses an integral heat insulation component 300, which cannot meet the design requirement of "meeting the arrangement position and overall length of multiple cells 110 before packaging, and also meeting the arrangement position and overall length of multiple cells 110 after packaging". It is difficult to solve the heat insulation problem between two adjacent rows of cells (e.g., the first cell group 100 and the second cell group 200).

[0047] To address this issue, some embodiments of this specification further design the thermal insulation component to have at least one deformation zone in the arrangement direction of the single row of cells (i.e., the second direction), so that the thermal insulation component can deform in the second direction to adapt to the displacement of the cell 110 before and after encapsulation.

[0048] In some embodiments, to ensure that the thermal insulation component 300 simultaneously satisfies the arrangement positions of the multiple battery cells 110 before and after encapsulation, as well as its overall length along the second direction, the thermal insulation component 300 has at least one deformation zone along the second direction. The deformation zone is capable of deformation under external forces to change the size and / or shape of the thermal insulation component 300 in the second direction. Deformation refers to the morphological change caused by an object being subjected to external forces or internal defects leading to a change in the relative positions of material particles.

[0049] Due to the design of the deformation zone, the thermal insulation component 300 can be connected to multiple cells of the corresponding cell group before encapsulation. During the encapsulation process, when the arrangement position and overall size of the multiple cells 110 in the second direction change, the deformation zone of the thermal insulation component 300 deforms under the influence of the cells 110, causing the shape and / or size of the thermal insulation component 300 in the second direction to change accordingly. This ensures the connection between the thermal insulation component 300 and the cells 110, facilitating the installation of the thermal insulation component 300 while guaranteeing its thermal insulation performance after encapsulation.

[0050] In some embodiments, the thermal insulation assembly 300 may include an integral flexible thermal insulation panel with good deformation performance. The flexible thermal insulation panel is connected to corresponding battery cell assemblies on both sides in the first direction via double-sided adhesive tape 330, such as... Figure 4 As shown. In some embodiments, the length of the flexible heat insulation plate along the second direction can correspond to the dimensions of the corresponding cell group before encapsulation. Before encapsulation of multiple cells 110, the flexible heat insulation plate can be bonded to the multiple cells 110 of the corresponding cell group using double-sided adhesive 330. During the encapsulation process, when the arrangement position and overall size of the multiple cells 110 in the second direction change, the flexible heat insulation plate deforms under the influence of the cells 110, ensuring the connection between the flexible heat insulation plate and the corresponding cell 110. This facilitates the installation of the flexible heat insulation plate while ensuring its thermal insulation performance after encapsulation.

[0051] In some embodiments, the material of the flexible insulation panel may include flexible insulation materials, such as ceramic composite materials.

[0052] Figure 5 This is another structural schematic diagram of a battery device according to one or more embodiments. Figure 6 This is another structural schematic diagram of the thermal insulation component according to one or more embodiments. Figure 7 yes Figure 6 A schematic diagram of the thermal insulation component from another perspective.

[0053] Please refer to Figure 5 , Figure 6 and Figure 7In some embodiments, the heat insulation assembly 300 includes a first heat insulation element 340 and a plurality of second heat insulation elements 350. The plurality of second heat insulation elements 350 are spaced apart along a second direction on one side of the first heat insulation element 340. The heat insulation assembly 300 is connected to the side of the battery cell in the first battery cell group 100 through the plurality of second heat insulation elements 350, and the heat insulation assembly 300 is connected to the side of the battery cell in the second battery cell group 200 through the other side of the first heat insulation element 340 opposite to the plurality of second heat insulation elements 350. The heat insulation effect of the heat insulation assembly 300 is improved by the cooperation of the first heat insulation element 340 and the second heat insulation elements 350.

[0054] In some embodiments, the first heat insulation member 340 has at least one deformation zone along the second direction. In some embodiments, the at least one deformation zone is located between two adjacent second heat insulation members 350 to avoid the second heat insulation members 350 interfering with the deformation of the deformation zone of the first heat insulation member 340. The second heat insulation member 350 mainly functions as heat insulation, blocking heat transfer between the first cell group 100 and the second cell group 200. The first heat insulation member 340 mainly functions as deformation. During the encapsulation process, the first heat insulation member 340 can deform, allowing the second heat insulation member 350 to move with the corresponding cell 110 in the first cell group 100, maintaining the connection between the second heat insulation member 350 and the corresponding cell 110, facilitating the installation of the heat insulation assembly 300 while ensuring the heat insulation performance of the heat insulation assembly 300 after encapsulation.

[0055] In some embodiments, the first heat insulation member 340 has a deformation function and a certain heat insulation performance, so as to insulate the gap between the multiple second heat insulation members 350, and minimize the heat transfer between the first battery cell group 100 and the second battery cell group 200 through the gap area between the multiple second heat insulation members 350, thereby improving the spatial continuity of the heat insulation effect between the battery cells and improving the heat insulation performance.

[0056] In some embodiments, the deformation function of the first thermal insulation element 340 can be achieved through flexible materials and / or deformation structures. The flexible materials may include, but are not limited to, ceramic composite materials. The deformation structures include, but are not limited to, pleated structures. In some embodiments, the ceramic composite material may include a ceramic composite tape, which can be formed by mixing ceramic powder with an adhesive and then applying it to a carrier (e.g., fabric). The ceramic powder may be made of aluminosilicate ceramics, silica ceramics, alumina ceramics, etc.

[0057] In some embodiments, the material of the first heat insulation element 340 may have high flexibility and / or toughness. High flexibility makes it easier for the first heat insulation element 340 to deform, allowing the second heat insulation element 350 to move with the corresponding battery cell 110. High toughness makes the first heat insulation element 340 less prone to damage after deformation, ensuring its service life.

[0058] In some embodiments, the material of the second heat insulation member 350 may be the same as or similar to the material of the heat insulation pad 120; the material of the first heat insulation member 340 may be the same as or similar to the material of the flexible heat insulation board.

[0059] Please refer to Figure 7 In some embodiments, the first heat insulation component 340 can be bonded to the second battery cell assembly 200 using double-sided adhesive 330, and the second heat insulation component 350 can be bonded to the first battery cell assembly 100 using double-sided adhesive 330. Double-sided adhesive 330 is applied to both the side of the first heat insulation component 340 facing the second heat insulation component 350 and the side of the second heat insulation component 350 facing the first heat insulation component 340, and the first heat insulation component 340 and the second heat insulation component 350 are bonded together using two layers of double-sided adhesive 330. Due to material limitations, direct bonding between the first heat insulation component 340 and the second heat insulation component 350 may be difficult, resulting in lower bonding strength. Therefore, two layers of double-sided adhesive 330 are provided between the first heat insulation component 340 and the second heat insulation component 350. One layer of double-sided adhesive 330 serves as a primer, and the other layer serves as an adhesive layer, so as to improve the bonding strength between the first heat insulation component 340 and the second heat insulation component 350 and make the connection between the first heat insulation component 340 and the second heat insulation component 350 stable.

[0060] In some embodiments, the thermal insulation component 300 may also be integrally formed. For example, a primer may be applied directly to the side of the first thermal insulation component 340 facing the second thermal insulation component 350 and / or the side of the second thermal insulation component 350 facing the first thermal insulation component 340. In this case, only one layer of double-sided adhesive 330 may be applied between the first thermal insulation component 340 and the second thermal insulation component 350, thereby ensuring a stable connection between the first thermal insulation component 340 and the second thermal insulation component 350 while reducing the thickness of the thermal insulation component 300.

[0061] In some embodiments, the first heat insulation member 340 has a plurality of first connection areas (not shown in the figure) on one side along a first direction, and a plurality of second connection areas (not shown in the figure) on the other side along the first direction. Each first connection area is connected to one side of a second heat insulation member 350, and the other side of each second heat insulation member is connected to a cell side of the first cell group 100. Each second connection area is connected to a cell side of the second cell group 200. At least one deformation area includes a wrinkled area on the first heat insulation member 340 located between two adjacent first connection areas and / or two adjacent second connection areas. The first connection areas and second connection areas on the first heat insulation member 340 can be adhesive areas. The aforementioned design can prevent the connection areas (such as adhesive areas) on the first heat insulation member 340 from affecting related areas (such as the area between adjacent connection areas) on the first heat insulation member 340, thereby enabling the related areas to undergo effective deformation and form wrinkled areas.

[0062] The folded region includes one or more folded structures arranged along a second direction. When the protrusion of the folded structures increases, the size of the folded region along the second direction decreases; when the protrusion of the folded structures decreases, the size of the folded region along the second direction increases; when the protrusion of the folded structures is zero, the folded region is smooth, and its size along the second direction is at its maximum. The change in the size of the folded region in the second direction causes deformation of the first thermal insulation element 340 in that direction. When the first thermal insulation element 340 deforms, the size of the folded region along the second direction decreases, and the protrusion of the folded structures increases.

[0063] The size of the wrinkled region in the second direction affects its deformation capability. If the size of the wrinkled region in the smooth state is too large in the second direction, it may lead to excessive compression and deformation after encapsulation, increasing the likelihood of damage to the wrinkled region of the first thermal insulation member 340. If the size of the wrinkled region in the smooth state is too small in the second direction, it will result in insufficient compression and deformation, affecting the connection between the second thermal insulation member 350 and the first battery cell assembly 100. In some embodiments, to ensure a suitable deformation range for the wrinkled region, its size in the smooth state in the second direction can be 2mm-10mm. Correspondingly, the spacing between adjacent second thermal insulation members 350 in the second direction on the first thermal insulation member 340 is 2mm-10mm. For example, the spacing between adjacent second thermal insulation members 350 in the second direction on the first thermal insulation member 340 may be 2mm, 4.5mm, 6mm, 7mm, or 10mm, etc.

[0064] Since the second heat insulation element 350 plays a primary role in heat insulation, it can be made relatively thick to ensure the insulation effect. The first heat insulation element 340 plays a secondary role in heat insulation and also functions as a deformable element. To reduce the difficulty of deformation of the first heat insulation element 340, its thickness can be relatively thin. In some embodiments, in the first direction, the thickness of the first heat insulation element 340 is less than the thickness of the second heat insulation element 350, such as... Figure 7 As shown, this allows for a thinner first insulation element 340 while a thicker second insulation element 350 is made, thereby reducing the overall thickness of the insulation assembly 300.

[0065] In some embodiments, in the first direction, the ratio of the thickness of the first heat insulation member 340 to the thickness of the second heat insulation member 350 does not exceed 0.5, so that the thickness of the first heat insulation member 340 is appropriate, while the thickness of the second heat insulation member 350 is relatively thick to ensure the heat insulation effect, and the overall thickness of the heat insulation assembly 300 is appropriate, so as to avoid the excessive thickness of the heat insulation assembly 300 affecting the encapsulation effect of the battery cell 110. For example, in the first direction, the ratio of the thickness of the first heat insulation member 340 to the thickness of the second heat insulation member 350 can be 0.1, 0.3, 0.45, or 0.5, etc.

[0066] If the thickness of the first heat insulation element 340 is too thick, it will increase the difficulty of deforming the first heat insulation element 340, for example, making it difficult to fold the wrinkled areas. If the thickness of the first heat insulation element 340 is too thin, it will be prone to damage during deformation, for example, the wrinkled areas will be prone to damage when folded. In some embodiments, the thickness of the first heat insulation element 340 in the first direction can be 0.1mm-0.5mm. For example, the thickness of the first heat insulation element 340 in the first direction can be 0.225mm.

[0067] Figure 8 This is a schematic diagram showing the connection between the second heat insulation element and the side of the battery cell according to one or more embodiments.

[0068] In some embodiments, a plurality of second heat insulation members 350 are connected one-to-one with the sides of a plurality of battery cells 110 of the first battery cell group 100. Please refer to Figure 8 In the second direction, the width of the second heat insulation member 350 is smaller than the width of the side of the battery cell 110, so as to leave sufficient wrinkle area between two adjacent second heat insulation members 350, while avoiding collision interference between two adjacent second heat insulation members 350, which would prevent the battery cell 110 connected to the two adjacent second heat insulation members 350 from continuing to move and affect the encapsulation effect. In some embodiments, in the second direction, the distance between the side of the second heat insulation member 350 and the corresponding side of the connected battery cell 110 can be less than or equal to 2 mm. For example, in Figure 8 In the second direction, the distance between the right side of the second heat insulation member 350 and the right side of the corresponding battery cell 110 is less than or equal to 2 mm, and / or the distance between the left side of the second heat insulation member 350 and the left side of the corresponding battery cell 110 is less than or equal to 2 mm.

[0069] In some embodiments, in the third direction, the height of the thermal insulation component 300 is not higher than the height of the battery cell 110 to avoid the thermal insulation component 300 affecting the encapsulation of the battery cell 110. Here, the third direction refers to the height direction of the battery cell 110. For example, the third direction can be the direction corresponding to the surface of the battery cell 110 where the terminal post is located (top surface) and the opposite surface (bottom surface). In some embodiments, the third direction intersects with the plane containing the first direction and the second direction. For example, the angle between the third direction and the plane containing the first direction and the second direction is 70°-90°. Another example is that the angle can be 90°.

[0070] In the third-direction orientation, the closer the height of the heat insulation component 300 is to the height of the battery cell 110, the larger the heat insulation area of ​​the battery cell 110, and the better the heat insulation effect of the heat insulation component 300. To ensure the heat insulation effect, in the third-direction orientation, the distance between the top of the heat insulation component 300 and the top edge of the side of the battery cell 110 can be 0mm-5mm, and / or, the distance between the bottom of the heat insulation component 300 and the bottom edge of the side of the battery cell 110 can be 0mm-5mm. Figure 8 As shown. For example, in the third direction, the distance between the top of the heat insulation component 300 and the top edge of the side of the battery cell 110 can be 3mm, and / or, the distance between the bottom of the heat insulation component 300 and the bottom edge of the side of the battery cell 110 can be 3mm.

[0071] Figure 9 This is another structural schematic diagram of a thermal insulation component according to one or more embodiments.

[0072] In some embodiments, in order to reduce material costs while ensuring thermal insulation performance, the height of the second thermal insulation element 350 of the thermal insulation assembly 300 may be higher than the height of the first thermal insulation element 340 in a third-party orientation, such as... Figure 9 As shown. The second heat insulation component 350 is relatively high, allowing it to cover the side of the corresponding battery cell 110 as much as possible, ensuring a good heat insulation effect. The first heat insulation component 340 is relatively low, avoiding interference with the encapsulation of the battery cell 110.

[0073] In other embodiments, since the first heat insulation member 340 has a small thickness and is made of a soft material in the first direction, it has little impact on the encapsulation of the battery cell 110. The height of the first heat insulation member 340 in the third direction can slightly exceed the height of the battery cell 110. For example, the top of the first heat insulation member 340 in the third direction can extend 2 mm beyond the top edge of the side of the battery cell 110.

[0074] Some embodiments of this specification also provide another battery device, which includes a first end plate, a second end plate, and two or more cell groups (e.g., a first cell group 100, a second cell group 200, and a third cell group, etc.) arranged along a first direction. Each of the two or more cell groups includes a plurality of cells 110 arranged along a second direction, wherein the second direction intersects the first direction. A heat insulation assembly 300 is provided between adjacent cell groups (e.g., the first cell group 100 and the second cell group 200). The heat insulation assembly 300 includes a first heat insulation element 340 and a plurality of second heat insulation elements 350. The plurality of second heat insulation elements 350 are disposed on one side of the first heat insulation element 340 along the first direction, and the plurality of second heat insulation elements 350 are spaced apart along the second direction. In some embodiments, the first end plate is disposed at one end of the two or more cell groups along the second direction, and the second end plate is disposed at the other end of the two or more cell groups along the second direction.

[0075] The structure of multiple cell packs sharing an end plate facilitates the assembly of the battery device. In some embodiments, the end plates and the two or more cell packs can be fastened together by strapping along the circumference of the first and second end plates, or support members (such as side plates) can be provided on both sides of the two or more cell packs, and the two end plates can be fixedly connected to the support members (such as by welding), thereby binding the two or more cell packs together to form a stable whole. In some embodiments, the end plates may also be provided with positioning holes, gripping surfaces, and other structures to facilitate the gripping and assembly of the battery device by automated production lines.

[0076] In some embodiments, the battery device may also include a connection component and a support component. Specific descriptions of the connection component and support component can be found in the preceding description of the battery device 10. In some embodiments, the battery device further includes an interface component, a control module, etc. The interface component enables each cell 110 to be electrically connected to an external device (e.g., a vehicle), and the control module can control the operating state of each cell 110. For example, the interface component may include an electrical interface, and the control module may include a controller.

[0077] In some embodiments, the battery device can be obtained by directly encapsulating multiple battery cells 110. In some embodiments, the battery device can also be obtained by encapsulating multiple battery cells 110 into a battery cell group, and then assembling or encapsulating one or more battery cell groups.

[0078] Some embodiments of this specification also provide a heat insulation assembly, which includes a first heat insulation element and a plurality of second heat insulation elements. The plurality of second heat insulation elements are spaced apart along a fourth direction on one side of the first heat insulation element, and the thickness of the first heat insulation element is smaller than the thickness of the second heat insulation elements. The thinner first heat insulation element is more prone to deformation, while the thicker second heat insulation elements provide better heat insulation, thereby enabling the heat insulation assembly to better adapt to the displacement of the battery cell 110 before and after packaging.

[0079] In the fourth direction, the distance between two adjacent second thermal insulation components is 2mm-10mm. It should be noted that this distance is the distance in the initial state of the first thermal insulation component before deformation (e.g., a smooth or flattened state). By setting this distance, collisions and interference between adjacent second thermal insulation components during installation can be avoided, while ensuring that the first thermal insulation component between adjacent second thermal insulation components has a sufficient deformation area to guarantee its deformation capability.

[0080] The beneficial effects that the embodiments of this specification may bring include, but are not limited to: (1) When the battery device includes multiple rows of cells, the heat insulation component disposed between the multiple rows of cells can play a heat insulation role, blocking the heat transfer between two adjacent rows of cells and reducing the risk of thermal runaway of the battery device. (2) The first heat insulation component and the second heat insulation component can work together to improve the heat insulation effect of the heat insulation component. (3) Through the design of the first heat insulation component and the second heat insulation component of the heat insulation component, the heat insulation component can be adapted to the arrangement position and overall length of multiple cells before and after packaging, ensuring the heat insulation effect while facilitating installation. It should be noted that different embodiments may produce different beneficial effects. In different embodiments, the beneficial effects that may be produced can be any one or a combination of the above, or any other possible beneficial effects.

[0081] The preferred embodiments of this specification have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts in this specification without inventive effort. Therefore, any technical solutions that can be obtained by those skilled in the art based on the concepts in this specification through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A battery device, characterized in that, It includes at least a first battery cell group and a second battery cell group arranged along a first direction, and each of the first battery cell group and the second battery cell group includes a plurality of battery cells arranged along a second direction, the second direction intersecting the first direction; A heat insulation component is provided between the first battery cell group and the second battery cell group. The heat insulation component includes a first heat insulation element and a plurality of second heat insulation elements. The plurality of second heat insulation elements are disposed on one side of the first heat insulation element along the first direction, and the plurality of second heat insulation elements are spaced apart along the second direction.

2. The battery device as claimed in claim 1, characterized in that, The first heat insulation element has at least one deformation zone along the second direction.

3. The battery device as claimed in claim 2, characterized in that, The heat insulation assembly is connected to the side of the battery cell in the first battery cell group through the plurality of second heat insulation elements, and the heat insulation assembly is connected to the side of the battery cell in the second battery cell group through the other side of the first heat insulation element away from the plurality of second heat insulation elements; The at least one deformation zone is located between two adjacent second insulation elements.

4. The battery device as claimed in claim 3, characterized in that, The first heat insulation component has a plurality of first connection areas on one side along the first direction, and a plurality of second connection areas on the other side along the first direction; each first connection area is connected to a second heat insulation component, and each second heat insulation component is connected to a cell side of the first cell group; each second connection area is connected to a cell side of the second cell group. The at least one deformation zone includes a wrinkled area on the first thermal insulation element located between two adjacent first connection zones and / or two adjacent second connection zones.

5. The battery device as claimed in claim 3, characterized in that, The plurality of second heat insulation components are connected one-to-one with the sides of the plurality of cells of the first cell group; in the second direction, the width of the second heat insulation component is smaller than the width of the side of the cell.

6. The battery device as claimed in claim 3, characterized in that, In the first direction, the ratio of the thickness of the first heat insulation element to the thickness of the second heat insulation element does not exceed 0.

5.

7. The battery device as claimed in claim 3, characterized in that, In the first direction, the thickness of the first heat insulation element is 0.1mm-0.5mm.

8. The battery device according to any one of claims 1-7, characterized in that, In a third-party orientation, the height of the thermal insulation component is not higher than the height of the battery cell; In the third direction, the distance between the top of the heat insulation component and the top edge of the side of the battery cell is 0mm-5mm; and / or, in the third direction, the distance between the bottom of the heat insulation component and the bottom edge of the side of the battery cell is 0mm-5mm, and the third direction intersects the plane containing the first direction and the second direction.

9. A battery device, characterized in that, It includes a first end plate, a second end plate, and two or more battery cell groups arranged along a first direction; Each cell group includes multiple cells arranged along a second direction, which intersects with the first direction; wherein, a heat insulation component is provided between two adjacent cell groups, the heat insulation component includes a first heat insulation element and multiple second heat insulation elements, the multiple second heat insulation elements are disposed on one side of the first heat insulation element along the first direction, and the multiple second heat insulation elements are spaced apart along the second direction; The first end plate is disposed at one end of the two or more battery cell groups along the second direction, and the second end plate is disposed at the other end of the two or more battery cell groups along the second direction.

10. A thermal insulation component, characterized in that, It includes a first heat insulation element and a plurality of second heat insulation elements, wherein the plurality of second heat insulation elements are spaced apart along a fourth direction on one side of the first heat insulation element; The thickness of the first heat insulation component is less than the thickness of the second heat insulation component; in the fourth direction, the distance between two adjacent second heat insulation components is 2mm-10mm.

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