Battery device and electric equipment

Abstract

The utility model discloses a battery device and electric equipment, and relates to the technical field of batteries, the battery device comprises a box body, an enclosure frame and at least one battery monomer group, the enclosure frame is arranged in the box body, the enclosure frame is provided with at least one side plate in a first direction, and the side plate is provided with a weak part; the at least one battery monomer group is arranged in the enclosure frame, the battery monomer group comprises a plurality of battery monomers which are stacked along a second direction, and the at least one battery monomer group is positioned on the side of the side plate; wherein the first direction intersects with the second direction. According to the technical scheme provided by the invention, when the battery monomers are subjected to thermal runaway, generate gas and expand, the locking of the enclosure frame to the plurality of battery monomers is released, so that the transfer of heat to the adjacent battery monomers is slowed down.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery device and an electric equipment. BACKGROUND

[0002] In the design of battery module, the battery pack is fixed by the shell, and the cyclic expansion deformation in the use cycle of the battery is well limited, which is beneficial to the service life and electrical performance of the battery.

[0003] However, after the thermal runaway of the battery cell, the locking and limiting of the shell are not conducive to the spread of the thermal runaway, and the good locking makes the adjacent battery cells tightly adhere to the runaway battery cell, and the heat of the runaway battery cell is smoothly transferred to the adjacent battery cells through the tightly adhered interface, so that the adjacent battery cells are prone to thermal runaway spread, thereby causing a chain reaction of the battery system. UTILITY MODEL CONTENT

[0004] The main purpose of the present application is to provide a battery device and an electric equipment, which aims to improve the situation of thermal runaway spread in the existing battery device due to the locking of the shell when the battery cell is in thermal runaway.

[0005] In a first aspect, the battery device provided by the present application comprises:

[0006] a box body;

[0007] a surrounding frame arranged in the box body, the surrounding frame having at least one side plate in a first direction, and a weak part is arranged on the side plate; and

[0008] at least one battery monomer group arranged in the surrounding frame, the battery monomer group comprising a plurality of battery monomers arranged in a second direction, and the at least one battery monomer group is located at the side of the side plate; wherein the first direction intersects the second direction.

[0009] In the technical scheme provided by the present application, the battery device is arranged to be locked and fixed by the surrounding frame at least one battery monomer group, and in the use cycle thereof, the surrounding frame can well limit the cyclic expansion deformation of the battery monomers in the battery monomer group, which is beneficial to the service life and electrical performance of the battery monomers. On this basis, the weak part is arranged on the side plate of the surrounding frame, and the weak part is arranged to be disconnected when the pressure exceeds a threshold value, and the arrangement of the weak part does not affect the normal cycle of the battery device. However, when the battery monomers in the battery monomer group located at the side of the side plate produce gas expansion in thermal runaway, the deformation amount thereof is larger than that in normal use. At this time, the battery monomers will cause the weak part to be disconnected when they expand and press the side plate, thereby causing the locking function of the surrounding frame to fail, and the battery monomers lose the locking force applied by the surrounding frame, so that the contact area between the thermal runaway battery monomers and the adjacent battery monomers is significantly reduced, thereby reducing the heat transfer from the thermal runaway battery monomers to the adjacent battery monomers, and improving the situation of thermal runaway spread of the battery device.

[0010] In some embodiments, the side plate comprises a weak portion and a body portion, the body portion is arranged adjacent to the weak portion, and the thickness of the weak portion is less than the thickness of the body portion.

[0011] The thickness of the weak portion on the side plate is set to be less than the thickness of the body portion adjacent thereto, thereby weakening the structural strength of the weak portion, achieving easy breaking of the weak portion without affecting the integrity of the side plate, meeting the structural requirements, and the integrity of the side plate is not affected, facilitating one-piece molding, low manufacturing cost, and not affecting the side plate as part of the surrounding frame. When the battery device is used normally, the battery monomer group is locked in the surrounding frame.

[0012] In some embodiments, a groove extending in a third direction is formed on the side plate, and the groove forms the weak portion; wherein the third direction intersects the first direction and the second direction.

[0013] The thickness of the side plate is reduced by using a groove to form the weak portion, which is simple in structure and low in molding cost.

[0014] In some embodiments, the groove is formed on the inner side of the side plate; and / or,

[0015] The groove is formed on the outer side of the side plate; and / or,

[0016] The groove is formed on the side plate.

[0017] Among the multiple schemes for setting the groove, there is no interference relationship between the multiple schemes, and the multiple schemes can be combined and selected according to different processing scenes and structural requirements, which is more applicable.

[0018] In some embodiments, the thickness of the weak portion gradually decreases from both sides to the middle.

[0019] The thickness of the side plate is changed by using a size gradient setting method to form the weak portion, and the structure of the side plate does not change sharply, and there is no stress concentration, so that the structure of the side plate is more stable, the service life is long, and the functional requirements of the weak portion are not affected.

[0020] In some embodiments, a plurality of vias extending in the first direction are formed on the side plate, and the plurality of vias are arranged in the third direction to form the weak portion.

[0021] The weak part is formed by arranging a plurality of through holes on the side plate in the third direction, which can guide the breaking path of the weak part, i.e., when the side plate is stressed, the part between adjacent through holes on the side plate breaks to connect the adjacent two through holes, and when all the through holes are connected, i.e., the side plate is disconnected, the extension direction of the disconnection section is basically along the arrangement direction of the plurality of through holes, i.e., the third direction, so that the disconnection position of the side plate is more controllable.

[0022] In some embodiments, the weak part on the side plate is arranged in a plurality in the second direction.

[0023] The weak part on the side plate is arranged in a plurality, which can avoid the situation that the battery cell which is in thermal runaway is far away from the weak part and the weak part is difficult to disconnect, so as to achieve a more comprehensive protection effect and meet the functional requirements.

[0024] In some embodiments, the enclosure has two side plates in the first direction, and the weak part is arranged on both of the two side plates.

[0025] The weak part is arranged on both of the two side plates in the first direction, which can achieve a better protection effect.

[0026] In some embodiments, the weak part on the two side plates is arranged oppositely in the first direction.

[0027] The weak part on the two side plates is arranged oppositely in the first direction, which is easier to be pressed and disconnected by the thermal runaway battery cell, and the appearance of the enclosure is better, and the structure design and production assembly are more convenient.

[0028] In some embodiments, the enclosure further has two end plates in the second direction, and the two ends of the end plate are respectively fixed to one side plate.

[0029] The enclosure is formed by two side plates and two end plates, which is simple in structure, easy to install and stable in structure, and meets the functional requirements of stably locking a plurality of battery cells.

[0030] In some embodiments, the enclosure has one battery cell group, and the two side plates are located on both sides of the battery cell group.

[0031] The battery monomer group is arranged in the frame, and only one battery monomer group is arranged in the frame, that is, only one row of battery monomers is arranged, so that the two sides of each battery monomer are adjacent to one side plate, on the one hand, the frame is more stable in locking the plurality of battery monomers, and on the other hand, when each battery monomer is in thermal runaway and expansion, the two side plates can be acted on, and the protection performance is stronger.

[0032] In some embodiments, the side plate is provided with the weak part at least at a position corresponding to the side wall of the battery monomer; and / or,

[0033] The side plate is provided with the weak part at least at a position corresponding to the interval between the two adjacent battery monomers.

[0034] The side plate is provided with the weak part at least at a position corresponding to the interval between the two adjacent battery monomers.

[0035] In some embodiments, the side plate is provided with the weak part at least at a position corresponding to the side wall of the battery monomer; and / or, BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the drawings shown.

[0037] Figure 1 The structure diagram of an embodiment of the vehicle provided by the present application is shown;

[0038] Figure 2 The structure diagram of an embodiment of the battery device provided by the present application is shown;

[0039] Figure 3 The first embodiment of the frame in the battery monomer group is shown in the plane structure diagram; Figure 2

[0040] Figure 4 The plane structure diagram when the battery monomer is in thermal runaway and expansion is shown in the battery monomer group; Figure 3

[0041] Figure 5 The second embodiment of the frame in the battery monomer group is shown in the plane structure diagram; Figure 2 ​​​

[0042] Figure 6 For Figure 2 A lateral plan structure schematic view of a third embodiment of a battery monomer group enclosed by a surrounding frame in the battery monomer group.

[0043] Explanation of reference numerals:

[0044] 1000, vehicle; 100, battery device; 1, surrounding frame; 11, side plate; 111, groove; 112, via hole; 12, end plate; 13, weak part; 14, body part; 2, battery monomer; 3, box; 200, controller; 300, motor; X, first direction; Y, second direction; Z, third direction.

[0045] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0046] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0048] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0049] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily mutually exclusive or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0050] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0051] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0052] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0053] In a normal battery module design, the battery pack is fixed by locking and fixing the end plate and the side plate, and the cycle expansion deformation in the use cycle of the battery is well limited, which is beneficial to the life and electrical performance of the battery. However, after the thermal runaway of the battery cell, the locking and limiting of the end plate and the side plate are not beneficial to the spread of the thermal runaway. The good locking of the end plate and the side plate makes the adjacent battery cells tightly adhere to the runaway battery cell, and the heat of the runaway battery cell is smoothly transferred to the adjacent battery cells through the tightly adhered interface, so that the adjacent battery cells are prone to thermal runaway spread, thereby causing chain runaway in the battery system.

[0054] The current improvement methods include cooling the thermal runaway battery cell to reduce its own temperature, and then reducing the heat transferred to the adjacent battery cell, or setting a heat insulation structure to separate the adjacent battery cells and block the heat transfer between the adjacent battery cells, so as to control the spread of thermal runaway. However, no matter which of the above methods, an additional structure is needed to assist in completing, so that the battery device structure is complex and the cost is high.

[0055] Further analysis of the causes of the above problems can show that the existing problems are mainly that the end plate and the side plate used to lock the battery cell to limit the small expansion deformation of the battery cell during normal use still limit the expansion of the battery cell when the battery cell has a large expansion deformation during thermal runaway, so that the thermal runaway battery cell and the adjacent battery cell are more closely attached, the heat is smoothly transferred, and the thermal runaway is further spread. Combined with the analysis results, it can be tried to adjust the structural strength of the end plate and the side plate to enable it to guarantee the extrusion limitation of the small deformation of the battery cell during normal use while being able to release the extrusion of the battery cell when the battery cell has a large expansion deformation during thermal runaway, so as to reduce the contact area between the thermal runaway battery cell and the adjacent battery cell, reduce heat transfer, and further optimize the thermal runaway spread problem.

[0056] The battery device disclosed in the embodiments of the present application can be used to provide electric energy for electric equipment, wherein the electric equipment can be but is not limited to electric vehicles, electric vehicles, ships, spacecraft, etc. Among them, spacecraft can include airplanes, rockets, space shuttles and spacecraft, etc.

[0057] The following embodiments are described for convenience with a vehicle 1000 as an example of an electric equipment in an embodiment of the present application.

[0058] Please refer to Figure 1 , Figure 1 The structure diagram of an embodiment of the electric equipment provided by the present application is a vehicle 1000. The vehicle 1000 can be a fuel car, a gas car or a new energy car, and the new energy car can be a pure electric car, a hybrid car or an extended range car, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as the operating power supply of the vehicle 1000. The vehicle 1000 can also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the working power demand of the vehicle 1000 during starting, navigation and driving.

[0059] In some embodiments of the present application, the battery device 100 can not only be used as the operating power supply of the vehicle 1000, but also be used as the driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0060] After the battery device 100 provided by the present application is applied to the electric equipment, at least the problem of battery device 100 thermal runaway spread can be improved, thereby affecting the normal driving of the vehicle 1000 and the driving experience of the driver and passenger.

[0061] For the convenience of understanding the battery device 100 provided in the present application, the following is described in conjunction with the accompanying drawings, Figure 2 A perspective structural diagram of an embodiment of the battery device 100 provided in the present application; Figure 3 A perspective structural diagram of an embodiment of the battery device 100 provided in the present application; Figure 2 A planar structural schematic diagram of a first embodiment of the battery monomer group enclosed by the surrounding frame in the battery device 100 provided in the present application; Figure 4 A planar structural schematic diagram of a first embodiment of the battery monomer group enclosed by the surrounding frame in the battery device 100 provided in the present application; Figure 3 A planar structural schematic diagram of the battery monomer 2 thermal runaway expansion in the battery device 100 provided in the present application; Figure 5 A planar structural schematic diagram of the battery monomer 2 thermal runaway expansion in the battery device 100 provided in the present application; Figure 2 A planar structural schematic diagram of a second embodiment of the battery monomer group enclosed by the surrounding frame in the battery device 100 provided in the present application; Figure 6 A planar structural schematic diagram of a second embodiment of the battery monomer group enclosed by the surrounding frame in the battery device 100 provided in the present application; Figure 2 A lateral planar structural schematic diagram of a third embodiment of the battery monomer group enclosed by the surrounding frame in the battery device 100 provided in the present application.

[0062] Please refer to Figure 3 to Figure 6 In the multiple embodiments of the battery device 100 provided in the present application, the battery device 100 includes a box 3, a surrounding frame 1 and at least one battery monomer 2 group, the surrounding frame 1 is arranged in the box 3, and the surrounding frame 1 has at least one side plate 11 in a first direction X, and the side plate 11 is provided with a weak part 13; at least one battery monomer 2 group is arranged in the surrounding frame 1, and the battery monomer 2 group includes multiple battery monomers 2 arranged in a second direction Y, and the at least one battery monomer 2 group is located at the side of the side plate 11.

[0063] It should be noted that the box 3 is the main loading component of the battery device 100, the surrounding frame 1 is the main locking component of the multiple battery monomers 2 in the battery monomer 2 group, and the battery device 100 is installed on the power consumption equipment through the box 3, and the battery monomer 2 is installed in the cavity of the box 3; wherein the surrounding frame 1 can be the shell of the battery module, and multiple surrounding frames 1 can be arranged in the box 3; in addition, the surrounding frame 1 can be arranged integrally or in a split manner, for example, the surrounding frame 1 includes a side plate 11 and an end plate 12, and the side plate 11 and the end plate 12 are arranged in a split manner to lock and fix the multiple battery monomers 2; regardless of the arrangement manner, the surrounding frame 1 can at least provide protection for the battery monomer 2 from the side.

[0064] In the battery device 100, a plurality of battery cells 2 are generally included, which can be connected in series or in parallel or in a mixed manner, and the mixed manner refers to a manner in which both series connection and parallel connection exist among the plurality of battery cells 2. The plurality of battery cells 2 can be directly connected in series or in parallel or in a mixed manner, and the plurality of battery cells 2 are collectively accommodated in the surrounding frame 1. The battery device 100 can further include other structures, for example, the battery device 100 can further include a current collecting component for realizing electrical connection among the plurality of battery cells 2. Each battery cell 2 can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 2 can be in the shape of a cylinder, a flat body, a cuboid or other shapes.

[0065] The weak part 13 functions to break under pressure exceeding a threshold value, and its specific form of arrangement can not be limited, and can satisfy the requirement of small expansion of the battery cell 2 in normal use, and break when the battery cell 2 has a large amount of expansion in thermal runaway, so as to release the locking force among the battery cells 2, reduce the contact area between the thermal runaway battery cell 2 and the adjacent battery cell 2, and further reduce heat transfer, thereby improving the problem of thermal runaway spreading.

[0066] It should be noted that the first direction X, the second direction Y and the third direction Z mentioned in the present application are three directions that intersect with each other in a three-dimensional space, and the included angle between any two of the three directions is generally 90 degrees, that is, the first direction X and the second direction Y are perpendicular to each other, the first direction X and the third direction Z are perpendicular to each other, and the second direction Y and the third direction Z are perpendicular to each other, but are not limited thereto, and the included angle between any two directions can also be any angle value between 80 degrees and 100 degrees; when the battery cell 2 is arranged as an aluminum shell cell as shown in FIG. 1, the first direction X is the length direction of the battery cell 2, the second direction Y is the thickness direction of the battery cell 2, and the third direction Z is the height direction of the battery cell 2. Figure 1

[0067] The "the surrounding frame 1 has at least one side plate 11 in the first direction X, and the side plate 11 is provided with a weak part 13" means that among the frame structures of the surrounding frame 1 in the first direction X, there is a side plate 11 provided with a weak part 13, and among the plurality of frame structures of the surrounding frame 1 in the first direction X, there can be one side plate 11 or a plurality of side plates 11, that is, as long as there is a side plate 11 provided with a weak part 13, the locking of the surrounding frame 1 to the battery cell 2 can be released when the weak part 13 breaks, thereby satisfying the functional requirements proposed in the present application.

[0068] ​The "at least one group of battery cells 2 is located at the side of the side plate 11" can be understood as the battery cell 2 is arranged close to the side plate 11, which on the one hand reduces the distance between the battery cell 2 and the side plate 11 to reduce the volume, and on the other hand, when the battery cell 2 close to the side plate 11 expands due to thermal runaway, it can directly abut against the side plate 11, which facilitates the disconnection of the driving weak part 13 to facilitate the release of the locking of the surrounding frame 1, and can better implement the functions required by the application. The group of battery cells 2 can be only one arranged at the side of the side plate 11, or multiple arranged at the side of the side plate 11, or all arranged at the side of the side plate 11, which is not limited here, and is mainly based on the structure of the actual battery device 100 to meet the above functions.

[0069] In the technical solutions provided by the application, the battery device 100 is arranged to be locked and fixed by the surrounding frame 1, and during its use cycle, the surrounding frame 1 can better limit the cyclic expansion deformation of the battery cell 2, which is beneficial to the service life and electrical performance of the battery cell 2. On this basis, the application further provides a weak part 13 on the side plate 11 of the surrounding frame 1, which is arranged to be disconnected when the pressure exceeds a threshold, and the arrangement of the weak part 13 will not affect the normal cycle of the battery device 100. However, when the battery cell 2 located at the side of the side plate 11 expands due to thermal runaway, the deformation amount is larger than that during normal use. At this time, the expansion of the battery cell 2 will cause the weak part 13 to break, thereby causing the locking function of the surrounding frame 1 to fail, and the locking force applied by the surrounding frame 1 between the battery cells 2 is lost, so that the contact area between the thermal runaway battery cell 2 and the adjacent battery cell 2 is significantly reduced, thereby reducing the heat transfer from the thermal runaway battery cell 2 to the adjacent battery cell 2, and improving the thermal runaway spreading of the battery device 100.

[0070] In the above embodiment, the weak part 13 can be arranged by replacing the material with lower structural strength on the side plate 11, or by destroying the internal structural integrity of the side plate 11 to reduce the local structural strength. However, it can be understood that the above method is complicated in structure, difficult to form, and high in manufacturing cost. Therefore, please refer to Figure 3 to Figure 5 In some embodiments, the side plate 11 includes a weak part 13 and a body part 14, the body part 14 is arranged adjacent to the weak part 13, and the thickness of the weak part 13 is less than the thickness of the body part 14.

[0071] It should be noted that in some embodiments of the application, the thickness of the side plate 11 is adjusted to form the weak part 13, and it can be understood that the specific way of adjusting the thickness is not limited, and is mainly based on the actual structural requirements.

[0072] The thickness of the weak portion 13 on the side plate 11 is set to be smaller than the thickness of the body portion 14 adjacent to the weak portion 13, so as to weaken the structural strength of the weak portion 13, and the easy-to-break setting of the weak portion is realized without affecting the integrity of the side plate 11, the structural requirements are met, the integrity of the side plate 11 is not affected, the integral molding is facilitated, the manufacturing cost is low, and the side plate 11 as a part of the surrounding frame 1 does not affect the normal use of the battery device 100, and the plurality of battery monomers 2 located in the surrounding frame 1 are locked.

[0073] Specifically, please refer to Figure 3 In the first embodiment, the groove 111 extending in the third direction Z is formed on the side plate 11, and the weak portion 13 is formed at the groove 111.

[0074] It should be noted that the groove 111 extending in the third direction Z can extend to both ends of the side plate 11 in the third direction Z, can extend to only one end of the side plate 11 in the third direction Z, or can be located in the middle of the side plate 11 in the third direction Z, all of which can thin the thickness of the side plate 11, meet the functional requirements of reducing the local structural strength of the side plate 11 to form the weak portion 13, and considering the convenience of processing and molding, the groove 111 in this embodiment extends directly to both ends of the side plate 11 in the third direction Z. It can be understood that the groove 111 is used to reduce the thickness of the side plate 11 to form the weak portion 13, which is simple in structure, easy to mold, and low in cost.

[0075] Please continue to refer to Figure 3 In the first embodiment, the groove 111 is formed on the inner side of the side plate 11; and / or, the groove 111 is formed on the outer side of the side plate 11; and / or, the groove 111 is formed through the side plate 11.

[0076] It should be noted that the groove 111 extending to both ends of the side plate 11 in the third direction Z has been described above, and the position of the groove 111 on the side plate 11 in the first direction X is not limited. In this embodiment, it is pointed out that the groove 111 can be formed on the inner side of the side plate 11, can be formed on the outer side of the side plate 11, or can be located in the middle of the side plate 11 in the first direction X and formed through the side plate 11. The three setting modes can all meet the requirement of reducing the thickness, and there is no interference between the three modes. Only one of the three modes can be set, two of the three modes can be combined, or all of the three modes can be set. The actual structure requirements are the main consideration. That is, the specific setting of the groove 111 can be combined and selected according to different processing scenes and structure requirements, which is more applicable.

[0077] In addition, please refer to Figure 5 In the second embodiment, the thickness of the weak portion 13 gradually decreases from both sides to the middle.

[0078] It should be noted that the thickness of the weakened portion 13 gradually decreases from both sides to the middle portion, and the gradually decreasing manner can be uniform reduction to form an inclined surface, or reduction with a certain radian to form an arc surface, or irregular reduction to form an irregular curved surface, which can meet the size requirement of gradual reduction. Moreover, the gradually decreasing forms of both sides of the weakened portion 13 can be the same or different, that is, the weakened portion 13 is symmetrically arranged relative to the middle portion when the same. The specific setting form is not specifically limited here, and the actual structure requirement position can meet the functional requirement.

[0079] When the thickness of the side plate 11 is changed by the size gradient setting mode to form the weakened portion 13, the structure shape of the side plate 11 has no sharp change and no stress concentration, so that the structure shape of the side plate 11 is more stable, the service life is long, and the functional requirement of easy folding after stress of the weakened portion 13 is not affected.

[0080] In addition to the above embodiment of forming the weakened portion 13 by changing the thickness of the side plate 11, the present application also proposes other embodiments, which are described in detail in Figure 6 For the third embodiment of the present application, a plurality of through holes 112 extending along the first direction X are arranged on the side plate 11, and the plurality of through holes 112 are arranged along the third direction Z to form the weakened portion 13.

[0081] It should be noted that the through hole 112 penetrates the side plate 11 along the first direction X, so as to cut off the structural connection of the side plate 11 in the second direction Y at the through hole 112, thereby reducing the structural strength at this position. Moreover, the plurality of through holes 112 are arranged along the third direction Z to form a connecting section between adjacent two through holes 112, and the plurality of connecting sections are arranged along the third direction Z, and the number of the through holes 112 is not limited here, and the number of the connecting sections is also not limited here, which is mainly based on the actual structure requirement.

[0082] It can be understood that the weakened portion 13 is formed by arranging a plurality of through holes 112 on the side plate 11 along the third direction Z, which can guide the breaking path of the weakened portion 13, that is, the part of the side plate 11 between adjacent through holes 112 breaks when the side plate 11 is stressed, so as to connect adjacent two through holes 112, and when all the through holes 112 are connected, that is, the side plate 11 is completely disconnected, the extension direction of the disconnection section is basically along the arrangement direction of the plurality of through holes 112, that is, the third direction Z, so that the disconnection position of the side plate 11 is more controllable.

[0083] In addition, please refer to Figure 3 to Figure 6 In some embodiments, the weakened portion 13 on the side plate 11 is spaced apart by a plurality of portions in the second direction Y.

[0084] It should be noted that, on the basis of ensuring that the overall structural strength of the side plate 11 can meet the expansion of the locked and restricted battery monomer 2 in normal use, the weak part 13 on the side plate 11 can be provided in multiple, and the specific number is not limited here, and the actual demand is the main, and three weak parts 13 are provided on the side plate 11 in the embodiment.

[0085] According to the above technical scheme, on the basis of not affecting the normal locking function of the surrounding frame 1, in combination with the lateral expansion of the thermal runaway battery monomer 2, the weak part 13 on the side plate 11 is provided in multiple, which can avoid the situation that the battery monomer 2 which is in thermal runaway is far away from the weak part 13, and the weak part 13 is difficult to break, so as to play a more comprehensive protection effect and meet the functional requirements.

[0086] In some embodiments, the surrounding frame 1 has two side plates 11 in the first direction X, and the weak part 13 is provided on both of the two side plates 11.

[0087] It should be noted that among the side plates of the surrounding frame 1 in the first direction X, there can be one side plate 11 or multiple side plates 11, which has been described above, and in the embodiment, the surrounding frame 1 has two side plates 11 in the first direction X, so as to respectively set the weak part 13 on both sides of the surrounding frame 1, so as to improve the number and distribution range of the weak part 13, and optimize the problem that when there are more battery monomers 2, some battery monomers 2 are far away from the weak part 13 and cannot stably break the weak part 13.

[0088] According to the above technical scheme, the thermal runaway battery monomer 2 is laterally expanded, that is, the structure on both sides of the thermal runaway battery monomer 2 is expanded, and the weak part 13 is provided on both side plates 11 of the surrounding frame 1 in the first direction X, which can play a better protection effect.

[0089] Please refer to Figure 3 to Figure 6 In some embodiments, the weak part 13 on the two side plates 11 is oppositely arranged in the first direction X.

[0090] It should be noted that the battery monomer 2 is laterally expanded, and the structure on both sides of the battery monomer 2 is expanded, which has been described above. Based on this, the weak part 13 on the two side plates 11 is oppositely arranged in the first direction X, that is, it is arranged corresponding to both sides of the battery monomer 2, so as to facilitate the extrusion of both sides of the battery monomer 2, and avoid the situation that when the battery monomer 2 tends to expand on one side and the weak part 13 is not arranged on the side, the weak part 13 on the other side cannot be pressed and broken.

[0091] According to the technical scheme, the two side plates 11 are provided with the weak portions 13, the weak portions 13 on the two side plates 11 are oppositely arranged in the first direction X, on the one hand, the weak portions 13 are more easily broken off by the expansion of the two sides of the thermal runaway battery cell, on the other hand, the appearance of the enclosure 1 is better, and the structure design and production assembly are more convenient.

[0092] Please continue to refer to 3 to Figure 6 In some embodiments, the enclosure 1 also has two end plates 12 in the second direction Y, and the two ends of the end plate 12 are fixed to the side plate 11.

[0093] It should be noted that the enclosure 1 can be integrally provided or split and spliced, which has been described above, in this embodiment, the enclosure 1 adopts a split and splicing form, that is, the two side plates 11 and the two end plates 12 are connected to enclose the battery cell 2 group.

[0094] According to the technical scheme, the enclosure 1 is formed by the two side plates 11 and the two end plates 12, so that the structure of the enclosure 1 is simple, easy to install and stable, and meets the functional requirements of stably locking a plurality of battery cells 2.

[0095] In some embodiments, the enclosure 1 is provided with one battery cell 2 group, and the two side plates 11 are located on both sides of the battery cell 2 group.

[0096] It should be noted that a plurality of battery cell 2 groups can also be arranged in the enclosure 1, and the plurality of battery cell 2 groups are arranged along the first direction X, but there is no partition between the battery cells 2 in the two battery cell 2 groups. When the battery cell 2 is in thermal runaway and expands, it will laterally abut against the battery cell 2 in the other battery cell 2 group on one side, affect the breaking of the weak portion 13, and further affect the release of the locking function of the enclosure 1, thereby affecting the improvement of the thermal propagation behavior.

[0097] According to the technical scheme, only one battery cell 2 group is arranged in the enclosure 1, that is, only one row of battery cells 2 is arranged, so that the two sides of each battery cell 2 are adjacent to one side plate 11. On the one hand, the locking of the enclosure 1 on the plurality of battery cells 2 is more stable, and on the other hand, the thermal runaway expansion of each battery cell 2 can act on the two side plates 11, and the protection performance is stronger.

[0098] In some embodiments, the side plate 11 is provided with the weak portion 13 at least at a position corresponding to the side wall of the battery cell 2; and / or, the side plate 11 is provided with the weak portion 13 at least at a position corresponding to the interval between the two adjacent battery cells 2.

[0099] It should be noted that the relative position relationship between the weak portion 13 provided on the side plate 11 and the battery monomer 2 in the second direction Y can not be specifically limited. When one of the plurality of battery monomers 2 locked expands, the force of the battery monomer 2 pushing the side plate 11 is borne by the whole side plate 11, that is, the stress of each part is increased, and the stress limit of the weak portion 13 is adjusted, that is, the weak portion 13 can be broken in the second direction Y and the expanded battery monomer is misaligned, so as to release the locking of the battery monomer 2 group by the surrounding frame 1. Specifically, in the embodiment, it is pointed out that the weak portion 13 can be provided on the side plate 11 corresponding to the side wall of the battery monomer 2, or the weak portion 13 can be provided on the side plate 11 corresponding to the interval between the adjacent two battery monomers 2, and when a plurality of weak portions 13 are provided, there is no interference between the two setting modes, and only one of the two setting modes can be set, or both of the two setting modes can be set. It is not specifically limited here, and is mainly based on the actual structure demand, so as to further facilitate the breaking of the weak portion 13 when the battery monomer 2 expands. That is, the specific setting of the relative position relationship between the weak portion 13 and the battery monomer 2 in the second direction Y can be combined and selected according to different processing scenes and structure demands, and is more applicable.

[0100] The application also provides a power utilization device, which comprises the battery device 100 for providing electric energy. The specific structure of the battery device 100 is referred to the above-mentioned embodiments. Since the power utilization device adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here. The battery device 100 is used to provide electric energy for the power utilization device, which includes but is not limited to new energy vehicles such as pure electric vehicles, hybrid electric vehicles and extended range electric vehicles, and can also include electric unmanned aerial vehicles, electric passenger aircraft and other aircraft.

[0101] The application provides a battery device 100, which comprises a box body 3, a surrounding frame 1 and a plurality of battery monomers 2 stacked in a second direction Y. The surrounding frame 1 is arranged in the box body 3, and comprises two side plates 11 in a first direction X and two end plates 12 in the second direction Y. The two end plates 12 are respectively fixed to one side plate 11. The plurality of battery monomers 2 are arranged in the surrounding frame 1, and the two side plates 11 are located on both sides of the plurality of battery monomers 2. The side plate 11 is provided with a plurality of grooves 111 extending in a third direction Z, and the grooves 111 are located on the outer side of the side plate 11. The grooves 111 on the two side plates 11 correspond to each other in the first direction X, and three grooves 111 are respectively arranged on the two side plates 11. Each groove 111 is arranged at an interval between adjacent two battery monomers 2 in the second direction Y.

[0102] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, The battery device comprises: a box body; a frame arranged in the box body, the frame having at least one side plate in a first direction, the side plate being provided with a weakened portion; at least one battery cell group arranged in the frame, the battery cell group comprising a plurality of battery cells arranged in a second direction, the at least one battery cell group being located at a side of the side plate; wherein the first direction intersects the second direction. The side plate comprises the weakened portion and a body portion, the body portion being arranged adjacent to the weakened portion, the thickness of the weakened portion being less than the thickness of the body portion.

2. The battery device of claim 1, wherein The side plate is provided with a groove extending in a third direction, the groove forming the weakened portion; 3. The battery device of claim 2, wherein wherein the third direction intersects the first direction and the second direction. The groove is arranged on an inner side of the side plate; and / or, 4. The battery device of claim 3, wherein The groove is arranged on an outer side of the side plate; and / or, The groove is arranged through the side plate. The thickness of the weakened portion gradually decreases from both sides to the middle of the weakened portion.

5. The battery device of claim 2, wherein The side plate is provided with a plurality of through holes extending in the first direction, and the plurality of through holes are arranged in the third direction to form the weakened portion.

6. The battery device of claim 1, wherein The weakened portions on the side plate are arranged in the second direction.

7. The battery device of claim 1, wherein The frame has two side plates in the first direction, and the two side plates are provided with the weakened portions.

8. The battery device of claim 1, wherein The weakened portions on the two side plates are arranged opposite to each other in the first direction.

9. The battery device of claim 8, wherein, The frame further has two end plates in the second direction, and the two end plates are respectively fixed to one side plate.

10. The battery device of claim 8, wherein The frame is provided with one battery cell group, and the two side plates are located at two sides of the battery cell group.

11. The battery device of claim 8, wherein The side plate is provided with the weakened portion at least at a position corresponding to a side wall of the battery cell; and / or, 12. The battery device of any one of claims 1 to 11, wherein The side plate is provided with the weakened portion at least at a position corresponding to a space between two adjacent battery cells. The battery device comprises the battery device according to any one of claims 1 to 12, and is used for providing electric energy.

13. An electrical device, characterized by ​

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