Battery device and electric equipment

Abstract

The invention relates to a battery device and electric equipment, and the battery device comprises a box body assembly which comprises a bottom wall; the protection plate group is positioned in the box body assembly and is arranged on the bottom wall; the battery module is arranged in the box body assembly and located above the protection plate set, the battery module comprises a confluence piece and a plurality of battery monomers arranged side by side in the first direction, each battery monomer comprises an electrode terminal, the electrode terminals are arranged towards the bottom wall, and the confluence piece is used for electrically connecting the electrode terminals of different battery monomers; the plurality of limiting beams are arranged between the battery module and the protection plate group, the limiting beams are arranged at the end part of the battery module along a second direction and are positioned on the outer side of the electrode terminal, the limiting beams are propped between the battery monomers and the protection plate group, and the second direction is vertical to the first direction; and the plurality of buffer pieces are abutted between the confluence piece and the protection plate group, and each limiting beam is at least provided with the buffer piece on one side provided with the electrode terminal along the second direction. The battery device can improve the working reliability.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device and electrical equipment. Background Technology

[0002] Due to the advantages of lithium-ion batteries, such as high energy density, high power density, high cycle life, and long storage time, they have been widely used in new energy electric vehicles.

[0003] Currently, some battery devices have their individual cells inverted, meaning the electrode terminals are facing downwards. To protect the electrode terminals, a protective structure is installed at the bottom of the casing to improve the overall bending and shear resistance. However, in actual use, it has been found that the reliability of this type of battery device remains relatively low. Summary of the Invention

[0004] The purpose of this application is to improve the operational reliability of battery devices.

[0005] According to a first aspect of this application, a battery device is provided, comprising: Enclosure assembly, including the bottom wall; The protective panel assembly is located inside the enclosure component and is installed on the bottom wall; The battery module is located inside the housing assembly and above the protective plate assembly. The battery module includes a busbar and multiple battery cells arranged side by side along a first direction. Each battery cell includes an electrode terminal, which is positioned facing the bottom wall. The busbar is used to electrically connect the electrode terminals of different battery cells. Multiple limiting beams are disposed between the battery module and the protective plate assembly. The limiting beams are located at the ends of the battery module along the second direction and outside the electrode terminals. The limiting beams abut against the battery cells and the protective plate assembly. The second direction is perpendicular to the first direction. Multiple buffers are abutted between the busbar and the protective plate assembly, and each limiting beam has a buffer on at least one side with an electrode terminal along the second direction.

[0006] This embodiment, by installing a protective plate assembly on the bottom wall inside the housing assembly, can first bear the main impact force transmitted from the outside of the housing assembly to the battery cells through the bottom wall. The remaining impact force can be directly transmitted to the buffer, or, after being transmitted to the limiting beam, a portion can be laterally transmitted to the buffer. Thus, for inverted battery cell arrangements, the buffer simultaneously provides support and cushioning, reducing the impact energy transmitted to the electrode terminals through the busbars, effectively buffering the impact energy transmission path, reducing deformation in the electrode terminal area, preventing failure, effectively protecting the electrode terminals, and ensuring the sealing performance of the electrode terminal area. Therefore, it can improve the operational reliability of the battery cells under impact conditions at the bottom.

[0007] Moreover, the limiting beam and the buffer are both in contact with the protection plate set, and the buffer is arranged at the side of the limiting beam, and the two combine to support the battery monomer and the busbar. Compared with the way of extending a long arm on the side of the limiting beam to support the battery monomer and the busbar in the related art, the limiting beam only retains the necessary structural support area, greatly reduces the volume and material usage of the limiting beam, fills between the limiting beam and the busbar through the buffer, ensures the buffering and supporting performance, avoids the structural easiness and material waste, realizes the light weight of the battery device, and saves the cost. In addition, the length of the arm of the limiting beam is shortened, and the problem of load concentration caused by an excessively large rigid structure can be prevented.

[0008] In addition, for different battery devices, different sizes of limiting beams and buffers can be arranged according to the structures, and the compatibility for different battery devices can be improved.

[0009] In some embodiments, the buffer extends to beyond the inner side edge of the electrode terminal along the second direction.

[0010] This embodiment makes the extension length of the buffer on the side of the limiting beam cover at least the area where the electrode terminal is located, can effectively protect the electrode terminal, buffer the transmission path of impact energy, reduce the deformation amount of the electrode terminal area, prevent failure, effectively protect the electrode terminal, and can ensure the sealing performance of the electrode terminal area.

[0011] In some embodiments, the limiting beam comprises: a limiting portion abutting against the battery module; and a connecting portion connected to at least one side of the limiting portion along the second direction and extending outwardly; wherein the buffer is provided with a groove towards the surface of the protection plate set, and the connecting portion is embedded in the groove.

[0012] This embodiment sets the connecting portion on the side of the limiting portion, and sets the groove on the bottom of the buffer, so that the connecting portion is embedded in the groove, can improve the reliability of the connection between the buffer and the limiting beam, is not easy to be dislocated or separated when subjected to impact, can better absorb vibration through the buffer, and improve the protection effect on the electrode terminal of the battery monomer; and the outwardly extending connecting portion can increase the deformation resistance of the limiting beam.

[0013] In some embodiments, the limiting portion, the connecting portion, and the bottom surface of the buffer are flush, and all are in contact with the protection plate set.

[0014] The embodiment sets a groove at the bottom of the buffer, and embeds the connecting part in the groove, which is conducive to making the limiting part, the connecting part and the bottom surface of the buffer flush, forming an overall flat surface at the bottom, and can form a larger contact area with the protection plate group. Therefore, the protection plate group can provide stable support for the overall assembly formed by the limiting beam and the buffer, preventing the buffer from being deflected to generate additional destructive force on the electrode terminal. In this way, the limiting beam can reliably fix the battery module, and the buffer can stably support the busbar, and at the same time, under the working condition of being impacted, the buffer can also absorb impact energy and reduce the impact force applied to the electrode terminal through the busbar, thereby better protecting the electrode terminal.

[0015] In some embodiments, the connecting part extends in the second direction to no more than the outer side edge of the electrode terminal.

[0016] The embodiment limits the maximum extension length of the connecting part, so that the connecting part has no overlapping part with the electrode terminal in the second direction, that is, the connecting part does not reach the position below the electrode terminal, which can appropriately reduce the support stiffness of the electrode terminal area, so that the buffer can fully play a role to absorb the impact force applied to the electrode terminal, thereby better protecting the electrode terminal.

[0017] In some embodiments, the limiting part is provided with a cavity extending in the first direction.

[0018] The embodiment sets a cavity in the limiting part, so that when the external impact force is transmitted to the limiting part through the protection plate group, the hollow limiting part has a certain effect of absorbing impact energy, thereby preventing the impact energy from being directly transmitted to the bottom of the battery monomer through the limiting part, which can improve the reliability of the battery monomer in operation and prevent the impact force from deforming the shell of the battery monomer to squeeze the electrode assembly. Moreover, such a structure can reduce the weight of the limiting beam, thereby realizing the lightweight of the battery device, and can be formed by extrusion or the like, which is convenient to manufacture.

[0019] In some embodiments, the plurality of limiting beams includes a first limiting beam, and the battery device includes at least two battery modules arranged at intervals in the second direction, and adjacent battery modules share a first limiting beam at a position close to each other. For the first limiting beam, the limiting part is provided with a connecting part and a buffer on both sides in the second direction.

[0020] The embodiment allows the adjacent battery modules to be designed with a smaller gap by sharing the first limiting beam, so that the overall layout is more compact, and the limiting part is provided with a connecting part and a buffer on both sides, which can support and buffer the electrode terminals on both sides. It can be seen that such a battery device can flexibly adjust the setting position and thickness of the buffer according to the position of the limiting beam and the position of the electrode terminal to realize modular adjustment.

[0021] In some embodiments, the box assembly comprises a plurality of expansion beams extending along the second direction, and the expansion beams are arranged at both ends of the battery module along the first direction, and the ends of the limiting beam are connected to the expansion beams at both ends of the battery module through fasteners.

[0022] This embodiment can define a cavity for accommodating the battery module through the expansion beams, and the ends of the limiting beam are locked to the expansion beams through fasteners, so as to stably and reliably limit and fix the inverted battery module, thereby improving the working reliability of the battery device under vibration and impact.

[0023] In some embodiments, the buffer is provided with a plurality of through holes arranged along the first direction, and the through holes are arranged opposite to the electrode terminals.

[0024] This embodiment considers that the electrode terminals protrude from the bottom surface of the shell and are subjected to greater stress and greater deformation under vibration and impact, and thus require greater buffering force. Therefore, by arranging the through holes in the position opposite to the electrode terminals of the buffer, the energy absorption efficiency of the buffer in the area where the electrode terminals are located can be further improved, so as to reduce the direct impact on the electrode terminals and improve the working reliability of the battery device. Moreover, this structure can make the top surface of the buffer better contact with the busbar and the bottom surface of the buffer better contact with the protection plate group, thereby improving the connection and support stability.

[0025] In some embodiments, the buffer is made of foam.

[0026] This embodiment arranges the buffer formed of foam material between the limiting beam and the busbar. The foam has high hardness and can provide good support. Moreover, the electrode terminals face downward and directly face the external impact source. The flexible energy absorption area is formed between the foam layer and the protection plate group, so that the flexibility of the energy dissipation path can be realized, the stress concentration caused by bottom impact can be significantly reduced, and plastic deformation or sealing failure of the electrode terminals can be prevented. The buffer can be microscopically compressed and deformed under impact load, so as to reduce the impact peak value, delay the load transmission, and disperse the impact energy, thereby providing good protection for the electrode terminals.

[0027] In some embodiments, the battery monomer comprises a pressure relief component and two electrode terminals arranged along the second direction, and the pressure relief component is arranged between the two electrode terminals. The busbar extends along the second direction to not more than the edge of the pressure relief component, and the buffer extends along the second direction to be flush with the busbar.

[0028] The embodiment makes the busbar extend in the second direction to the edge of the pressure relief component, so that the busbars adjacent in the second direction in the same battery module form an exhaust channel with a width not less than the width of the pressure relief component, which is conducive to the smooth exhaust of high-temperature gas in the case of thermal runaway. Moreover, the buffer extends to the same level as the busbar, which does not affect the width of the exhaust channel, and when the bottom is impacted, the bottom and edge of the busbar are supported by the buffer, so that the busbar is not easily deformed to affect the electrical connection reliability. If the busbar is designed as a cantilever, it is easy to bend and deform. Further, the busbar can also prevent the impact force from being transmitted to the pressure relief component through the electrode terminal, so as to prevent the pressure relief component from being damaged and improve the structural reliability of the pressure relief component. Thus, on the basis of ensuring the bottom support strength and the protection capability of the electrode terminal and the explosion-proof area, the exhaust demand in the case of thermal runaway can be met, and the possibility of danger in work can be reduced.

[0029] In some embodiments, the protection plate set comprises: a bottom protection plate made of metal material, used for bearing the main impact force transmitted from the bottom wall; and a coating layer arranged between the bottom protection plate and the bottom wall, used for protecting the bottom protection plate.

[0030] The protection plate set of the embodiment is provided with a coating layer at the joint with the bottom wall, which can improve the durability of the battery device in a humid, corrosive or gravel impact environment, and a bottom protection plate is arranged on the side away from the bottom wall, which is a layer structure mainly bearing the impact force and can resist most of the impact force through greater strength. To prevent a larger impact force from acting on the electrode terminal.

[0031] In some embodiments, the protection plate set further comprises: a honeycomb plate arranged on the side of the bottom protection plate away from the coating layer, used for dispersing the impact force transmitted by the bottom protection plate; and / or a composite material plate arranged on the side of the bottom protection plate away from the coating layer, the composite material plate comprising transverse fibers and longitudinal fibers arranged alternately; and / or a mica plate arranged on the side of the bottom protection plate away from the coating layer, and abutting against the limiting beam and the buffer, the mica plate being used for heat insulation and insulation.

[0032] The protection plate set of the embodiment is provided with a honeycomb plate, which is a hollow sandwich structure with high specific strength and good buffering performance. After the impact force is blocked by the bottom protection plate, the load is further dispersed by the honeycomb plate. The composite material plate is provided to provide transverse stiffness and overall stability, and to minimize deformation in the third direction. The mica plate is mainly used for heat insulation, insulation and fire and explosion prevention, and acts as a heat shield to isolate the heat source from the battery monomer, block the high temperature of the battery monomer from being transmitted outward, prevent the spread of heat caused by thermal runaway from causing the entire battery device to catch fire and explode, and improve the system safety level.

[0033] According to a second aspect of the present application, there is provided a power-using device comprising the battery device of the above embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced as follows. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of the drawings.

[0035] Figure 1 Structure diagram of some embodiments of the power-using device of the present application.

[0036] Figure 2 Structure diagram of some embodiments of the battery device of the present application.

[0037] Figure 3 Structure diagram of the expansion beam connected to the box assembly in the battery device of the present application.

[0038] Figure 4 Structure diagram of some embodiments of the bottom guard plate installed in the box in the battery device of the present application.

[0039] Figure 5 Structure diagram of some embodiments of the buffer installed on the limiting beam.

[0040] Figure 6 Structure diagram of the protection structure provided at the bottom of the battery monomer in the battery device of the present application.

[0041] Figure 7 Structure diagram of the buffer installed on the right side of the limiting beam.

[0042] Figure 8 Structure diagram of the buffer installed on the left side of the limiting beam.

[0043] Figure 9 Structure diagram of some embodiments of the honeycomb plate.

[0044] In the drawings, the drawings are not drawn according to the actual scale.

[0045] Label explanation: 1, box assembly; 10, bottom wall; 11, box; 12, cover; 13, expansion beam; 2, battery module; 20, battery monomer; 21, shell; 22, electrode terminal; 23, pressure relief component; 3, limiting beam; 31, limiting part; 32, connecting part; 33, recessed part; 34, mounting hole; 35, extension part; 3A, first limiting beam; 3B, second limiting beam; 4, buffer; 41, through hole; 42, groove; 5, protective plate group; 51, coating; 52, bottom guard plate; 53, honeycomb plate; 54, composite material plate; 55, mica plate; 6, fastener; 7, busbar; 8, exhaust passage; 100, battery device; 200, vehicle; 201, cabin; 202, floor; x, first direction; z, second direction; y, third direction. DETAILED DESCRIPTION

[0046] The embodiments of the present application will be further described in conjunction with the drawings and examples. The detailed description of the following examples and drawings are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described examples.

[0047] 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).

[0048] The present application uses the description of the orientation or position relationship indicated by "upper", "lower", "top", "bottom", "front", "rear", "inner" and "outer" and the like. This is only for the convenience of describing the present application, and is not intended to indicate or imply that the device must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application.

[0049] In addition, the terms "first", "second", "third" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable range of error. "Parallel" is not strictly parallel, but within the allowable range of error. The orientation words appearing in the following description are the directions shown in the drawings, and are not limited to the specific structure of the present application.

[0050] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] 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 some embodiments of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. As will be apparent to those of ordinary skill in the art, embodiments described herein can be combined with other embodiments.

[0052] The battery cell can include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., and the embodiments of the present application are not limited thereto. The battery cell can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc., and the embodiments of the present application are not limited thereto. The battery cell is generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft-pack battery cells, and the embodiments of the present application are not limited thereto. The current battery cell generally includes a shell and an electrode assembly accommodated in the shell, and the shell is filled with an electrolyte.

[0053] The current battery cell generally includes a shell and an electrode assembly accommodated in the shell, and the shell is filled with an electrolyte. The electrode assembly is mainly formed by laminating or winding a first pole piece and a second pole piece with opposite polarities, and generally a separator is provided between the first pole piece and the second pole piece. The coated portions of the first pole piece and the second pole piece constitute the main body of the electrode assembly, and the uncoated portions of the first pole piece and the second pole piece each constitute a first pole tab and a second pole tab. In a lithium-ion battery, the first pole piece can be a positive pole piece including a positive pole current collector and positive pole coating layers provided on both sides of the positive pole current collector, and the material of the positive pole current collector can be, for example, aluminum, and the positive pole coating can be, for example, lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate, etc.; the second pole piece can be a negative pole piece including a negative pole current collector and negative pole coating layers provided on both sides of the negative pole current collector, and the material of the negative pole current collector can be, for example, copper, and the negative pole coating layer can be, for example, graphite or silicon, etc. The first pole tab and the second pole tab can be located together at one end of the main body or at two ends of the main body, respectively. During the charging and discharging process of the battery cell, the positive pole coating layer and the negative pole coating layer react with the electrolyte, and the pole tabs connect the electrode lead-out portions to form a current loop.

[0054] In some current battery devices, the battery cell is inverted, i.e., the electrode terminal is arranged downward, and in order to protect the electrode terminal, a protection structure is provided at the bottom of the box body to improve the overall bending and shearing resistance of the structure. However, it is found that the reliability of such battery devices is still low in actual use.

[0055] The reason is that the protection structure generally adopts high-rigidity and high-thickness metal materials (such as steel plates or aluminum alloy plates) to improve the overall bending and shearing resistance of the structure. However, when the battery device is subjected to a bottom impact load, the "overly rigid coupling" support structure will directly transmit the impact force to the electrode terminal (such as the pole), causing mechanical damage to the electrode terminal, failure of the sealing structure at the connection between the electrode terminal and the shell, and further inducing internal short circuit, thermal runaway and other problems, thereby reducing the reliability of the battery device in operation.

[0056] Therefore, in order to improve the reliability of the battery device in operation, an improved battery device is provided.

[0057] The battery device of the embodiments of the present application is suitable for various electric equipment. The electric equipment can be a mobile phone, a portable device, a notebook computer, an electric vehicle, an electric automobile, a ship, a spacecraft, an electric toy and an electric tool, etc.

[0058] As shown in Figure 1 , the electric equipment can be a vehicle 200, such as a new energy vehicle, which can be a pure electric vehicle, a hybrid electric vehicle or a range extended vehicle, etc.; or the electric equipment can also be a drone or a ship, etc. The vehicle 200 can include a cabin 201 and a vehicle floor 202, and the battery device 100 is arranged between the cabin 201 and the vehicle floor 202. The battery device 100 can be arranged at the bottom, the head or the tail of the vehicle 200, for providing electric energy for the operation of the motor and other components in the vehicle.

[0059] The present application provides a battery device 100, as shown in Figure 2 , comprising: a box assembly 1 comprising a bottom wall 10; a protection plate group 5 located in the box assembly 1 and arranged on the bottom wall 10; a battery module 2 arranged in the box assembly 1 and above the protection plate group 5, the battery module 2 comprising a busbar 7 and a plurality of battery monomers 20 arranged side by side along a first direction x, the battery monomer 20 comprising an electrode terminal 22 arranged towards the bottom wall 10, the busbar 7 being used for electrically connecting the electrode terminals 22 of different battery monomers 20; a plurality of limiting beams 3 arranged between the battery module 2 and the protection plate group 5, the limiting beam 3 being arranged at the end of the battery module 2 along a second direction y and outside the electrode terminal 22, the limiting beam 3 abutting between the battery monomer 20 and the protection plate group 5, the second direction y being perpendicular to the first direction x; and a plurality of buffer members 4 abutting between the busbar 7 and the protection plate group 5, each limiting beam 3 being provided with at least one buffer member 4 on the side along the second direction y where the electrode terminal 22 is arranged.

[0060] The housing assembly 1 may include a housing 11 and a cover 12. The housing 11 has an interior cavity for accommodating individual battery cells 20. Depending on the shape, number, arrangement, and other requirements of the battery cells 20, the housing 11 may have different shapes and sizes; for example, the housing 11 may be rectangular. The cover 12 is used to close the opening of the housing 11. To facilitate maintenance of the battery device 100, the housing assembly 1 is detachably installed on the electrical equipment. In the installed state of the battery device 100, the bottom wall 10 of the housing 11 is located at the bottom.

[0061] The protective plate assembly 5 is located inside the housing assembly 1 and disposed on the bottom wall 10, serving to provide overall protection for all battery cells 20 and reduce the impact force transmitted from outside the housing assembly 1 through the bottom wall 10 to the battery cells 20. The protective plate assembly 5 may include a single layer structure, or multiple identical layer structures stacked along a third direction z (the thickness direction of the battery device 100) to enhance a single protective function, or multiple different layer structures stacked along the third direction z to achieve multiple different protective functions. The third direction z is perpendicular to the first direction x and the second direction y.

[0062] Battery module 2 is housed within housing assembly 1 and located above protective plate assembly 5. One or more battery modules 2 can be installed, and when multiple battery modules 2 are installed, they can be spaced apart along the second direction y. Each battery module 2 includes a busbar 7 and multiple battery cells 20 arranged side-by-side along the first direction x. The busbar 7 is used to electrically connect the electrode terminals 22 of different battery cells 20 to achieve series, parallel, or mixed connections of multiple battery cells 20 within the battery module 2. The busbar 7, also known as a battery plate, is made of metal. The battery cells 20 are placed vertically, meaning the thickness direction of the battery cell 20 is aligned with the first direction x.

[0063] like Figure 6 As shown, the battery cell 20 includes a housing 21, an electrode assembly is disposed inside the housing 21, and an electrode terminal 22 is provided at the bottom of the housing 21, with the electrode terminal 22 facing the bottom wall 10. For example, the housing 21 includes a shell and an end cap, the end cap covering the opening of the shell, and the electrode terminal 22 is disposed on the end cap. For example, one electrode terminal 22 may be provided at the bottom of the housing 21, or two may be provided at intervals along the second direction y, or multiple electrode terminals may be provided, and the battery cell 20 may be cuboid in shape.

[0064] For example, electrode terminal 22 can be a pole or the like. Electrode terminal 22 protrudes from the bottom surface of housing 21.

[0065] The plurality of limiting beams 3 are arranged at intervals along the second direction y and extend along the first direction x, and the limiting beams 3 are arranged between the battery module 2 and the protection plate group 5 along the third direction z, and the limiting beams 3 are arranged at the end of the battery module 2 along the second direction y and outside the electrode terminal 22, for pressing the shoulder of the battery module 2, and the limiting beams 3 abut between the battery monomer 20 and the protection plate group 5. The limiting beam 3 can be a pressing strip or the like.

[0066] The buffer 4 abuts between the busbar 7 and the protection plate group 5 along the third direction z, and each limiting beam 3 is provided with the buffer 4 at least on the side where the electrode terminal 22 is arranged along the second direction y, or the buffer 4 is also arranged on the side of the limiting beam 3 where the electrode terminal 22 is not arranged along the second direction y. The buffer 4 is made of energy-absorbing material and can absorb energy by compression deformation, and is deformable at least along the third direction z.

[0067] The battery monomer 20 can be, for example, a lithium ion secondary battery, a lithium ion primary battery, a lithium-sulfur battery, a sodium lithium ion battery, or a magnesium ion battery, etc.

[0068] This embodiment can first bear the main impact force transmitted from the outside of the box assembly 1 to the battery monomer 20 through the bottom wall 10 by arranging the protection plate group 5 on the bottom wall 10 in the box assembly 1, and the remaining impact force can be directly transmitted to the buffer 4, or a part of the impact force transmitted to the limiting beam 3 can also be transmitted laterally to the buffer 4, thereby, for the inverted battery monomer 20 arrangement form, the buffer 4 simultaneously plays a supporting and buffering role, can reduce the impact energy transmitted to the electrode terminal 22 through the busbar 7, effectively buffers the transmission path of the impact energy, reduces the deformation amount of the electrode terminal 22 area, prevents failure from occurring, effectively protects the electrode terminal 22, and can ensure the sealing performance of the electrode terminal 22 area. Therefore, the working reliability of the battery monomer 20 under the impact working condition at the bottom can be improved.

[0069] Moreover, the limiting beam 3 and the buffer 4 are both in contact with the protection plate group 5, and the buffer 4 is arranged at the side of the limiting beam 3, and the two together support the battery monomer 20 and the busbar 7, compared with the way of extending a long arm on the side of the limiting beam 3 in the related art to simultaneously support the battery monomer 20 and the busbar 7, the limiting beam 3 only retains the necessary structural support area, greatly reduces the volume and material usage of the limiting beam 3, and fills the space between the limiting beam 3 and the busbar 7 through the buffer 4, while ensuring the buffering and supporting performance, avoids structural and material waste, realizes the lightweight of the battery device 100, and saves costs. In addition, the length of the arm of the limiting beam 3 is shortened, which can prevent the problem of load concentration caused by an excessively large rigid structure.

[0070] In addition, for different battery devices 100, the limiting beam 3 and the buffer 4 can be set to different sizes according to the structure thereof, and the compatibility for different battery devices 100 can be improved.

[0071] In some embodiments, as shown in Figure 6 the buffer 4 extends to the inner side edge of the electrode terminal 22 along the second direction y.

[0072] For example, the battery cell 20 is a cuboid, and two electrode terminals 22 are arranged at the bottom of the battery cell 20 along the second direction y, and the buffer 4 extends to the inner side edge of the electrode terminal 22 close to the buffer 4 along the second direction y.

[0073] This embodiment makes the extension length of the buffer 4 on the side of the limiting beam 3 cover at least the area where the electrode terminal 22 is located, can effectively protect the electrode terminal 22, buffer the transmission path of impact energy, reduce the deformation amount of the area of the electrode terminal 22, prevent failure, effectively protect the electrode terminal 22, and ensure the sealing performance of the area of the electrode terminal 22.

[0074] In some embodiments, as shown in Figure 6 , Figure 7 and Figure 8 the limiting beam 3 comprises: a limiting portion 31 abutting against the battery module 2; and a connecting portion 32 connected to the limiting portion 31 and extending outwardly along at least one side of the limiting portion 31 along the second direction y; wherein the buffer 4 is provided with a groove 42 on the surface thereof facing the protection plate group 5, and the connecting portion 32 is embedded in the groove 42.

[0075] For example, the limiting portion 31 extends along the first direction x and can cover the entire length of a single battery module 2 along the first direction x, and the limiting portion 31 can have a rectangular structure, and the top surface thereof along the second direction y is used to support the bottom surface of the battery cell 20.

[0076] The connecting portion 32 can extend outwardly from one side of the limiting portion 31 or extend outwardly from both sides of the limiting portion 31. For example, the bottom of the limiting portion 31 can be provided with an overall flat plate structure, the flat plate structure covers the bottom surface of the limiting portion 31 and extends towards the side portion to form the connecting portion 32, or the connecting portion 32 directly extends outwardly from the bottom area of the side wall of the limiting portion 31.

[0077] The bottom surface of the buffer 4 is provided with a groove 42 on the side close to the connecting portion 32, and the outwardly extending connecting portion 32 is embedded in the groove 42. The buffer 4 and the connecting portion 32 can be connected by means of adhesive, for example, fixed by using structural adhesive, and the adhesive strength can be selected to be between 0.5 MPa and 500 MPa according to the actual working conditions (such as whether it needs to be disassembled, the packaging stiffness, etc.).

[0078] The embodiment improves the reliability of the connection between the buffer 4 and the limiting beam 3 by arranging the connecting part 32 on the side of the limiting part 31 and arranging the groove 42 on the bottom of the buffer 4, and embedding the connecting part 32 in the groove 42, so that the buffer 4 is not prone to dislocation or separation when subjected to impact, and can better absorb vibration through the buffer 4, thereby improving the protection of the electrode terminal 22 of the battery monomer 20; and the outwardly extending connecting part 32 can increase the ability of the limiting beam 3 to resist deformation.

[0079] In some embodiments, as shown in Figure 6 The limiting part 31, the connecting part 32 and the bottom surface of the buffer 4 are flush, and all contact the protection plate group 5.

[0080] For this structure, the connecting part 32 directly extends outward from the bottom area of the side wall of the limiting part 31.

[0081] The embodiment improves the reliability of the connection between the buffer 4 and the limiting beam 3 by arranging the connecting part 32 on the side of the limiting part 31 and arranging the groove 42 on the bottom of the buffer 4, and embedding the connecting part 32 in the groove 42, so that the buffer 4 is not prone to dislocation or separation when subjected to impact, and can better absorb vibration through the buffer 4, thereby improving the protection of the electrode terminal 22 of the battery monomer 20; and the outwardly extending connecting part 32 can increase the ability of the limiting beam 3 to resist deformation.

[0082] In some embodiments, the connecting part 32 extends along the second direction y to not more than the outer side edge of the electrode terminal 22.

[0083] As shown in Figure 6 The connecting part 32 extends along the second direction y to exactly reach the outer side edge of the electrode terminal 22.

[0084] The embodiment appropriately reduces the support stiffness of the electrode terminal 22 area by limiting the maximum extension length of the connecting part 32, so that the connecting part 32 has no overlapping part with the electrode terminal 22 in the second direction y, that is, the connecting part 32 does not reach the position below the electrode terminal 22, so that the buffer 4 can fully play a role to absorb the impact force applied to the electrode terminal 22, thereby better protecting the electrode terminal 22.

[0085] In some embodiments, the limiting part 31 is provided with a cavity extending along the first direction x.

[0086] The cavity has openings at both ends along the first direction x, and the limiting beam 3 of this structure can be integrally extruded. For example, the cross section of the limiting part 31 is rectangular.

[0087] Optionally, a cross beam is arranged in the limiting portion 31, and the cross beam is connected to the two side walls of the limiting portion 31 along the second direction y. Such a structure can also resist deformation in the third direction z, and compared with the structure in which a longitudinal beam is arranged in the limiting portion 31, the cross beam can prevent the impact force from being directly transmitted to the battery monomer 20.

[0088] The limiting portion 31 with the cavity, or the limiting portion 31 further provided with the cross beam, can be provided with a flat structure at the bottom surface to form the limiting beam 3, which is suitable for the case where the assembly and structural rigidity are required to be high. Alternatively, the limiting beam 3 can be formed in one piece, which can simplify the number of parts, improve the assembly efficiency and product consistency while meeting the rigidity requirement.

[0089] In this embodiment, the hollow limiting portion 31 has a certain effect of absorbing impact energy when the external impact force is transmitted to the limiting portion 31 through the protection plate set 5, so as to prevent the impact energy from being directly transmitted to the bottom of the battery monomer 20 through the limiting portion 31, thereby improving the reliability of the battery monomer 20 in operation and preventing the shell 21 of the battery monomer 20 from being deformed to press the electrode assembly. Moreover, such a structure can reduce the weight of the limiting beam 3, thereby realizing the lightweight of the battery device 100, and can be formed by extrusion or the like, which is convenient to manufacture.

[0090] In some embodiments, as shown in Figure 5 and Figure 6 , the plurality of limiting beams 3 includes a first limiting beam 3A, and the battery device 100 includes at least two battery modules 2 arranged at intervals along the second direction y, and adjacent battery modules 2 share one first limiting beam 3A at a position close to each other. For the first limiting beam 3A, the limiting portion 31 is provided with the connecting portion 32 and the buffer 4 on both sides along the second direction y.

[0091] In the first limiting beam 3A, the top surface of the limiting portion 31 abuts against the end of the two adjacent battery modules 2 along the second direction y, the limiting portion 31 is provided with the connecting portion 32 on both sides along the second direction y, and each connecting portion 32 is connected to one buffer 4, and the buffer 4 contacts the side wall of the limiting portion 31 along one side wall along the second direction y. The first limiting beam 3A and the buffers 4 on both sides can be formed into an integral assembly by bonding.

[0092] Further, the plurality of limiting beams 3 can also include a second limiting beam 3B, and the second limiting beam 3B is located outside the outermost battery module 2. In one structure, as shown in Figure 6As shown, the two sides of the limiting part 31 of the second limiting beam 3B are provided with connecting parts 32, and the connecting parts 32 on the two sides are provided with buffer members 4, which can play a more optimal buffering impact force effect. In another structure, as shown in Figure 5 As shown, the limiting part 31 of the second limiting beam 3B is only provided with a connecting part 32 and a buffer member 4 on the inner side, which does not affect the protection effect on the electrode terminal 22, and can also reduce the space occupied in the second direction y.

[0093] This embodiment allows the gap between adjacent battery modules 2 to be designed to be smaller by sharing the first limiting beam 3A between adjacent battery modules 2, so that the overall layout is more compact, and the limiting part 31 is provided with a connecting part 32 and a buffer member 4 on both sides, which can support and buffer the electrode terminals 22 on both sides. It can be seen that the battery device 100 can flexibly adjust the setting position and thickness of the buffer member 4 according to the position of the limiting beam 3 and the position of the electrode terminal 22, so as to realize modular adjustment.

[0094] In some embodiments, the box assembly 1 includes a plurality of expansion beams 13 extending along the second direction y, and the battery module 2 is provided with an expansion beam 13 at both ends along the first direction x, and the two ends of the limiting beam 3 are connected to the expansion beams 13 at both ends of the battery module 2 by fasteners 6.

[0095] For example, only one set of battery modules 2 is provided in the box assembly 1 along the first direction x, and one expansion beam 13 is provided at a position close to each end along the first direction x in the box assembly 1, and the region between the two expansion beams 13 defines a region for placing the battery module 2. Alternatively, at least two sets of battery modules 2 are provided in the box assembly 1 along the first direction x, and each battery module 2 is provided with an expansion beam 13 at both ends along the first direction x, and each battery module 2 can be provided with a limiting beam 3 at both ends along the second direction y, and the two ends of each limiting beam 3 are fixed to the two expansion beams 13, respectively.

[0096] For example, the fastener 6 can be a screw, a bolt, or a rivet, etc.

[0097] As shown in Figure 3 As shown, the wall surface of the limiting part 31 facing the bottom wall 10 is provided with a recessed part 33 at both ends in the extension direction, so that the head of the fastener 6 is located entirely within the recessed part 33, and thus the bottom surface of the limiting beam 3 can be in contact with the protection plate group 5.

[0098] As shown in Figure 7 As shown, a schematic view of the buffer member 4 connected to the right side of the limiting beam 3; as shown in Figure 8As shown, the buffer 4 is connected to the left side of the limiting beam 3. The limiting part 31 is provided with an extension part 35 at the bottom area of the two ends along the first direction x, and the mounting hole 34 is arranged on the extension part 35. The fastener 6 passes through the extension part 35 and the expansion beam 13 in sequence to fix the two ends of the limiting beam 3 to the two expansion beams 13 respectively.

[0099] This embodiment can define a cavity for accommodating the battery module 2 through the expansion beam 13, and can lock the two ends of the limiting beam 3 to the expansion beam 13 through the fastener 6, so as to stably and reliably limit and fix the inverted battery module 2, thereby improving the working reliability of the battery device 100 under vibration and impact.

[0100] In some embodiments, as Figure 5 , Figure 7 and Figure 8 , the buffer 4 is provided with a plurality of through holes 41 spaced apart along the first direction x, and the through holes 41 are arranged opposite to the electrode terminals 22.

[0101] For example, the through hole 41 can be a round hole, an oval hole, a square hole, a sandglass-shaped hole, a special-shaped hole, etc., which can be designed according to the actual arrangement and stress characteristics of the electrode terminal 22, and can further optimize the local stress distribution and buffering deformation capacity.

[0102] This embodiment considers that the electrode terminal 22 protrudes from the bottom surface of the shell 21 and has a large stress and a large deformation under vibration and impact, and thus needs a large buffering force. Therefore, by arranging the through hole 41 opposite to the electrode terminal 22 on the buffer 4, the energy absorption efficiency of the buffer 4 in the region of the electrode terminal 22 can be further improved, so as to reduce the direct impact on the electrode terminal 22 and improve the working reliability of the battery device 100. Moreover, such a structure can make the top surface of the buffer 4 better contact with the busbar 7 and the bottom surface of the buffer 4 better contact with the protection plate group 5, thereby improving the connection and support stability.

[0103] In some embodiments, the buffer 4 is made of foam.

[0104] For example, the buffer 4 is made of a hard foam material. The hard foam is a kind of foaming material with a porous structure, high hardness and small compression deformation, such as MPP, RPU, PEEK, etc. Microcellular Polypropylene foam (MPP), Rigid Polyurethane foam (RPU) or Polyether Ether Ketone foam (PEEK).

[0105] The embodiment sets a buffer 4 made of foam material between the limiting beam 3 and the busbar 7. The foam has high hardness and can provide good support. Moreover, the electrode terminal 22 faces downward and directly faces the external impact source. A flexible energy absorption zone is formed between the foam layer and the protection plate set 5, so that the energy dissipation path is flexible, the stress concentration caused by the bottom impact is significantly reduced, and plastic deformation or sealing failure of the electrode terminal 22 is prevented. The buffer 4 can be microscopically compressed and deformed under the action of the impact load, thereby reducing the impact peak value, delaying the load transmission, and dispersing the impact energy, so as to provide good protection for the electrode terminal 22.

[0106] In some embodiments, as shown in FIG. 1, the battery cell 20 includes a pressure relief component 23 and two electrode terminals 22 spaced apart along the second direction y, and the pressure relief component 23 is arranged between the two electrode terminals 22. Figure 6 In some embodiments, as shown in FIG. 1, the battery cell 20 includes a pressure relief component 23 and two electrode terminals 22 spaced apart along the second direction y, and the pressure relief component 23 is arranged between the two electrode terminals 22.

[0107] Specifically, the pressure relief component 23 refers to an element or component that is actuated to release the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold. The threshold value is designed differently according to different design requirements. The threshold value can depend on the material of one or more of the positive electrode sheet, the negative electrode sheet, the electrolyte, and the separator film in the battery cell 20. The pressure relief component can take the form of a pressure relief valve, a gas valve, a pressure relief valve, or a safety valve, and can specifically take the form of a pressure-sensitive or temperature-sensitive element or structure, i.e., when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold, the pressure relief component 23 performs an action or a weak structure provided in the pressure relief component is broken, thereby forming an opening or passage for the internal pressure or temperature to be released.

[0108] The "actuation" mentioned in the present application refers to the pressure relief component 23 generating an action or being activated to a certain state, so that the internal pressure and temperature of the battery cell 20 can be released. The action generated by the pressure relief component 23 can include but is not limited to at least one of the following: breaking, shattering, tearing, or opening of the pressure relief component, etc. When the pressure relief component is actuated, the internal discharge of the battery cell 20 will be discharged outward from the actuated part. In this way, the battery cell 20 can be pressure-released and temperature-released under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0109] Wherein, the discharge from the battery cell 20 mentioned here includes but is not limited to: electrolyte, dissolved or split positive and negative electrode sheets, fragments of the separator film, high-temperature and high-pressure gases (such as CH4, CO, etc. Combustible gases) generated by reactions, flames, etc.

[0110] ​For example, the busbar 7 extends beyond the inner edge of the electrode terminal 22 in the second direction y, but does not extend beyond the edge of the pressure relief component 23, i.e., one side of the busbar 7 in the second direction y is located between the pressure relief component 23 and the electrode terminal 22. The buffer 4 extends to the same level as the busbar 7 in the second direction y. Alternatively, the buffer 4 can also extend beyond or retract by a preset distance relative to the edge of the busbar 7 in the second direction y.

[0111] This embodiment makes the busbar 7 extend beyond the edge of the pressure relief component 23 in the second direction y, so that the exhaust channel 8 with a width not less than the width of the pressure relief component 23 is formed between the busbars 7 adjacent in the second direction y in the same battery module 2, which is beneficial for the smooth exhaust of high-temperature gas in the case of thermal runaway. Moreover, the buffer 4 extends to the same level as the busbar 7, which does not affect the width of the exhaust channel 8, and when the bottom is impacted, the busbar 7 is not easy to deform and affect the electrical connection reliability because the bottom and the edge of the busbar 7 are supported by the buffer 4, and the busbar 7 is easy to bend and deform if it is designed as a cantilever. Furthermore, the busbar 7 can also prevent the impact force from being transmitted to the pressure relief component 23 through the electrode terminal 22, so as to avoid damage to the pressure relief component 23 and improve the structural reliability of the pressure relief component 23. Thus, on the basis of ensuring the bottom support strength and the protection ability of the electrode terminal 22 and the explosion-proof area, the exhaust demand in the case of thermal runaway can be met, and the possibility of danger in work can be reduced.

[0112] In some embodiments, as shown in Figure 6 The protection plate set 5 includes: a bottom protection plate 52 made of metal and used for bearing the main impact force transmitted from the bottom wall 10; and a coating 51 arranged between the bottom protection plate 52 and the bottom wall 10 and used for protecting the bottom protection plate 52.

[0113] The coating 51 is a bottom protection layer and is mainly used for improving the durability of the battery device 100 in a humid, corrosive or gravel impact environment, for example, polyurea or epoxy paint; and the bottom protection plate 52 is the lowermost layer of the force-bearing structure and can be made of high-strength aluminum alloy or dual-phase steel to ensure sufficient resistance to impact from ground foreign objects. As shown in Figure 4 The bottom protection plate 52 and the coating 51 are fixed to the bottom wall 10 by fasteners.

[0114] The protection plate set 5 of this embodiment is provided with the coating 51 at the joint with the bottom wall 10, which can improve the durability of the battery device 100 in a humid, corrosive or gravel impact environment, and is provided with the bottom protection plate 52 on the side away from the bottom wall 10, which is used as the layer structure mainly bearing the impact force and can first resist most of the impact force through greater strength. So as to prevent the larger impact force from acting on the electrode terminal 22.

[0115] In some embodiments, as shown in FIG. 5, the protection plate group 5 further comprises: Figure 6 a honeycomb plate 53 arranged on the side of the bottom guard plate 52 away from the coating 51, for dispersing the impact force transmitted by the bottom guard plate 52; and / or a composite material plate 54 arranged on the side of the bottom guard plate 52 away from the coating 51, the composite material plate 54 comprising transverse fibers and longitudinal fibers arranged alternately; and / or a mica plate 55 arranged on the side of the bottom guard plate 52 away from the coating 51 and abutting against the limiting beam 3 and the buffer 4, the mica plate 55 being used for heat insulation and insulation. As shown in FIG. 5, the honeycomb plate 53 can be made of aluminum and has a hollow sandwich structure, high specific strength and good buffering performance, and can effectively disperse the bottom load.

[0116] Figure 9 The composite material plate 54 provides transverse stiffness and overall stability, and the material can be selected from glass fiber or carbon fiber reinforced thermosetting resin. The composite material comprises a matrix and fibers, and the transverse stiffness is the result of the combined action of the fibers, the constraint action of the matrix and the interface between them. The composite material tends to have high specific strength and high specific stiffness in the selection of matrix and fiber reinforced material. The anisotropic performance is mainly controlled by the lamination angle, lamination sequence and lamination ratio.

[0117] The mica plate 55 is mainly used for heat insulation, insulation, fire prevention and explosion prevention, and serves as a heat shield to isolate the heat source from the battery monomer 20, block the high temperature of the battery monomer 20 from being transmitted outward, prevent the spread of heat runaway heat from causing the entire battery device 100 to catch fire and explode, and improve the system safety level.

[0118] Specifically, the protection plate group 5 comprises, from the side close to the bottom wall 10, the coating 51, the bottom guard plate 52, the honeycomb plate 53, the composite material plate 54 and the mica plate 55 in sequence. Adjacent layer structures can be fixed by bonding or other means. During assembly of the battery device 100, the protection plate group 5 can be fixed in sequence, or the protection plate group 5 can be formed in advance and then the protection plate group 5 is installed as a whole in the box assembly 1.

[0119] The protection plate group 5 of this embodiment is provided with the honeycomb plate 53, which has a hollow sandwich structure, high specific strength and good buffering performance. After the impact force is blocked by the bottom guard plate 52, the load is further dispersed by the honeycomb plate 53. The composite material plate 54 provides transverse stiffness and overall stability, and tries to minimize the deformation in the third direction z. The mica plate 55 is mainly used for heat insulation, insulation, fire prevention and explosion prevention, and serves as a heat shield to isolate the heat source from the battery monomer 20, block the high temperature of the battery monomer 20 from being transmitted outward, prevent the spread of heat runaway heat from causing the entire battery device 100 to catch fire and explode, and improve the system safety level.

[0120] The protection plate group 5 of this embodiment is provided with the honeycomb plate 53, which has a hollow sandwich structure, high specific strength and good buffering performance. After the impact force is blocked by the bottom guard plate 52, the load is further dispersed by the honeycomb plate 53. The composite material plate 54 provides transverse stiffness and overall stability, and tries to minimize the deformation in the third direction z. The mica plate 55 is mainly used for heat insulation, insulation, fire prevention and explosion prevention, and serves as a heat shield to isolate the heat source from the battery monomer 20, block the high temperature of the battery monomer 20 from being transmitted outward, prevent the spread of heat runaway heat from causing the entire battery device 100 to catch fire and explode, and improve the system safety level. ​

[0121] The following describes a specific embodiment of the battery device 100. Figures 2 to 9 The following describes a specific embodiment of the battery device 100.

[0122] As shown in FIG. 1, the battery device 100 includes a box assembly 1 and a plurality of battery modules 2. The box assembly 1 includes a box 11 and a cover 12. The box 11 has a cavity inside. A protection plate set 5 is arranged in the box assembly 1 and is disposed on the bottom wall 10. The protection plate set 5 is used to protect all the battery cells 20 as a whole and reduce the impact force transmitted from the outside of the box assembly 1 to the battery cells 20 through the bottom wall 10. The protection plate set 5 has a multi-layer structure, from bottom to top, including a coating layer 51, a bottom protection plate 52, a honeycomb plate 53, a composite material plate 54, and a mica plate 55. Figure 2 The battery modules 2 are arranged in the box assembly 1 and above the protection plate set 5. The battery modules 2 are arranged in multiple numbers and are arranged at intervals along the second direction y. Each battery module 2 includes a plurality of battery cells 20 arranged side by side along the first direction x and a busbar 7 for electrically connecting the electrode terminals 22 of different battery cells 20.

[0123] The adjacent battery modules 2 share a first limiting beam 3A at a position close to each other. For the first limiting beam 3A, the limiting part 31 is provided with a connecting part 32 and a buffer 4 on both sides along the second direction y. The first limiting beam 3A and the buffers 4 on both sides can form a whole assembly by bonding. The bottom surfaces of the buffers 4 and the limiting beam 3 are flush and in contact with the top surface of the protection plate set 5. The buffer 4 abuts between the busbar 7 and the buffer 4 in the third direction z. The same battery module 2 forms an exhaust passage 8 between the two buffers 4 and the two busbars 7. For example, the buffer 4 can be hard foam. A plurality of through holes 41 are arranged at intervals along the first direction x on the buffer 4, and the through holes 41 are opposite to the electrode terminals 22.

[0124] The battery device 100 of this embodiment has at least one of the following advantages:

[0125] 1. When the buffer 4 is subjected to a bottom impact, it will be compressed and deformed, significantly absorbing and buffering the instantaneous energy, effectively reducing the path and intensity of the impact load directly transmitted to the electrode terminals 22, preventing the electrode terminals 22 from deforming, cracking, and sealing failure, and improving the system's impact resistance. 2. The length of the connecting part 32 on both sides of the limiting beam 3 is reduced, which can prevent rigid coupling with the electrode terminals 22, so that the impact energy is first dissipated through the buffer 4 and then transmitted to the battery cells 20, forming a "flexible transition layer" and achieving multi-stage buffering.

[0126]

[0127] ​3. The buffer 4 is provided with a through hole 41, and the hollow design provides space for the deformation of the buffer 4, reduces the structural stiffness peak, and makes the stress area have better yield extension capacity and controllable collapse behavior, effectively delays the propagation of shock wave and disperses the load, and improves the corresponding ability to impact in different directions.

[0128] 4. The length of the connecting part 32 of the limiting beam 3 is reduced, and cooperates with the buffer 4 to support the busbar 7, which can reduce the amount of rigid parts and the structure weight, reduce the complexity of the assembly parts, and improve the production efficiency and lightweight performance.

[0129] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to it without departing from the scope of the application, and equivalent components can be substituted therefor. In particular, the technical features mentioned in each embodiment can be combined in any way 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 in that, include: The housing assembly (1) includes a bottom wall (10); The protective plate assembly (5) is located inside the housing assembly (1) and disposed on the bottom wall (10). A battery module (2) is disposed inside the housing assembly (1) and above the protective plate assembly (5). The battery module (2) includes a busbar (7) and a plurality of battery cells (20) arranged side by side along a first direction (x). Each battery cell (20) includes an electrode terminal (22) which is disposed toward the bottom wall (10). The busbar (7) is used to electrically connect the electrode terminals (22) of different battery cells (20). Multiple limiting beams (3) are disposed between the battery module (2) and the protective plate assembly (5). The limiting beams (3) are located at the end of the battery module (2) along the second direction (y) and outside the electrode terminal (22). The limiting beams (3) abut against the battery cell (20) and the protective plate assembly (5). The second direction (y) is perpendicular to the first direction (x). Multiple buffers (4) are abutted between the busbar (7) and the protective plate group (5), and each limiting beam (3) has the buffer (4) provided on at least one side where the electrode terminal (22) is provided along the second direction (y).

2. The battery device according to claim 1, characterized in that, The buffer (4) extends along the second direction (y) beyond the inner edge of the electrode terminal (22).

3. The battery device according to claim 1, characterized in that, The limiting beam (3) includes: The limiting part (31) abuts against the battery module (2); and The connecting portion (32) is connected to at least one side of the limiting portion (31) along the second direction (y) and extends outward; The buffer (4) has a groove (42) on its surface facing the protective plate assembly (5), and the connecting part (32) is embedded in the groove (42).

4. The battery device according to claim 3, characterized in that, The bottom surfaces of the limiting part (31), the connecting part (32) and the buffer (4) are flush and all contact the protective plate assembly (5).

5. The battery device according to claim 3, characterized in that, The connecting portion (32) extends along the second direction (y) to the outer edge of the electrode terminal (22).

6. The battery device according to claim 3, characterized in that, The limiting part (31) has a cavity extending along the first direction (x).

7. The battery device according to claim 3, characterized in that, The plurality of limiting beams (3) include a first limiting beam (3A), and the battery device includes at least two battery modules (2) spaced apart along the second direction (y), with adjacent battery modules (2) sharing a first limiting beam (3A) at positions close to each other. For the first limiting beam (3A), the limiting part (31) is provided with the connecting part (32) and the buffer (4) on both sides along the second direction (y).

8. The battery device according to claim 3, characterized in that, The housing assembly (1) includes a plurality of expansion beams (13) extending along the second direction (y). The battery module (2) is provided with the expansion beams (13) at both ends along the first direction (x). The two ends of the limiting beam (3) are respectively connected to the expansion beams (13) at both ends of the battery module (2) by fasteners (6).

9. The battery device according to claim 1, characterized in that, The buffer (4) is provided with a plurality of through holes (41) spaced apart along the first direction (x), and the through holes (41) are positioned opposite to the electrode terminals (22).

10. The battery device according to claim 1, characterized in that, The cushioning element (4) is made of foam.

11. The battery device according to claim 1, characterized in that, The battery cell (20) includes a pressure relief component (23) and two electrode terminals (22) spaced apart along the second direction (y), with the pressure relief component (23) disposed between the two electrode terminals (22); The manifold (7) extends along the second direction (y) to an extent not exceeding the edge of the pressure relief component (23), and the buffer (4) extends along the second direction (y) to be flush with the manifold (7).

12. The battery device according to any one of claims 1 to 11, characterized in that, The protective panel assembly (5) includes: The bottom guard plate (52), made of metal, is used to bear the main impact force transmitted from the bottom wall (10); and A coating (51) is disposed between the bottom protective plate (52) and the bottom wall (10) to protect the bottom protective plate (52).

13. The battery device according to claim 12, characterized in that, The protective panel assembly (5) also includes: A honeycomb panel (53), disposed on the side of the bottom protective plate (52) away from the coating (51), is used to disperse the impact force transmitted by the bottom protective plate (52); and / or A composite material plate (54) is disposed on the side of the bottom protective plate (52) away from the coating (51), the composite material plate (54) comprising interlaced transverse and longitudinal fibers; and / or A mica plate (55) is disposed on the side of the bottom protective plate (52) away from the coating (51) and is attached to the limiting beam (3) and the buffer (4). The mica plate (55) is used for heat insulation and insulation.

14. An electrical appliance, characterized in that, Includes the battery device according to any one of claims 1 to 13.

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