Battery pack and electric device

Abstract

The utility model provides a kind of battery pack and electric equipment, battery pack includes first cabinet and second cabinet, first cabinet forms the cell cavity with one side opening, and second cabinet cover is located in opening;Support is located in cell cavity, and is supported between first cabinet and second cabinet, support is provided with hollow structure along its length direction and is penetrated.This application technical scheme is by being provided with hollow structure in support, so, when support is deformed inward by external pressure or impact force, hollow structure in support can be deformed in support Space is left for bracket, to relieve stress concentration caused by external impact, reduce the stress damage probability of support, prolong the service life of support.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a bracket, a battery pack, and an electrical device. Background Technology

[0002] With the technological iteration of new energy electric vehicles, energy storage systems, and high-energy-consuming portable devices, battery packs, as the core unit of energy storage, face higher requirements for structural safety and service reliability. Existing battery packs generally adopt a split-type box structure, with a lower first box forming the cell cavity, and a top-cover second box sealing the cell cavity of the first box.

[0003] A support frame is typically installed between the first and second battery pack housings to provide support for the second housing and ensure the stability of the connection between them. However, due to space constraints in the battery pack, the support frame itself must be designed compactly, which limits its strength and rigidity under load. Especially during long-term use, stress can easily accumulate inside the support frame. These stresses not only reduce the load-bearing capacity of the support frame but may also lead to fatigue deformation or cracks, severely affecting its support effect on the second housing.

[0004] Therefore, how to solve the stress concentration problem of the support and improve its service life has become an urgent problem to be solved in the industry. Utility Model Content

[0005] In view of this, the present invention aims to provide a bracket, a battery pack, and an electrical device, in order to solve the problem that the battery pack bracket is prone to deformation due to stress concentration in the related art.

[0006] To achieve the objectives of this application, in a first aspect, this application proposes a battery pack, the battery pack comprising:

[0007] The first housing has a cell cavity with an opening on one side.

[0008] A second housing, the second housing being disposed over the opening;

[0009] The bracket is disposed inside the cell cavity and supported between the first housing and the second housing. The bracket has a hollow structure that runs through it along its length.

[0010] In conjunction with the first aspect, in one possible implementation, along the length of the bracket, the projection of the hollow structure includes a horizontal segment, a vertical segment, and an inclined segment;

[0011] The first end of the horizontal segment is connected to the first end of the vertical segment; the inclined segment is connected between the second end of the horizontal segment and the second end of the vertical segment.

[0012] In conjunction with the first aspect, in one possible implementation, along the length direction of the support, the projection further includes a first arc segment, a second arc segment, and a third arc segment; the first arc segment connects the horizontal segment and the inclined segment; the second arc segment connects the vertical segment and the inclined segment; and the third arc segment connects the horizontal segment and the vertical segment.

[0013] In conjunction with the first aspect, in one possible implementation, the bracket has a first end face disposed opposite to the second housing;

[0014] At least one inclined segment of the hollow structure is arranged parallel to the first end face.

[0015] In conjunction with the first aspect, in one possible implementation, the length of the horizontal segment is A, the length of the vertical segment is B, the length of the inclined segment is C, and the radii of the first arc segment, the second arc segment, and the third arc segment are D, satisfying:

[0016] 2mm≤A≤4mm; and / or

[0017] 6mm≤B≤8mm; and / or

[0018] 7mm≤C≤9mm; and / or

[0019] 0.5mm≤D≤2mm.

[0020] In conjunction with the first aspect, in one possible implementation, the support includes a support body and a buffer layer, and the hollow structure is disposed on the support body; the support body has a first end face for being disposed opposite to the second housing.

[0021] The buffer layer is disposed on the first end face.

[0022] In conjunction with the first aspect, in one possible implementation, the battery pack further includes a battery module disposed within the cell cavity;

[0023] The bracket includes a bracket body and an insulating layer, and the hollow structure is provided on the bracket body;

[0024] The bracket body has a second end face for facing the battery module; the insulating layer is disposed on the second end face.

[0025] In conjunction with the first aspect, in one possible implementation, the battery pack further includes a battery module; the battery module is disposed within the cell cavity; the battery module has a mounting frame, and the cell cavity has a first mating surface;

[0026] The bracket is disposed between the fixed beam and the second box body. The bracket includes a bracket body, which includes a body portion and a protrusion portion. The hollow structure is disposed on the body portion. The body portion has a third end face that is disposed opposite to the first mating surface. At least a portion of the fixed frame is clamped between the first mating surface and the third end face.

[0027] The protrusion extends from the third end face toward the first mating surface and is spaced apart from the first mating surface.

[0028] In conjunction with the first aspect, in one possible implementation, the distance between the protrusion and the first mating surface along the height direction of the battery pack is H, satisfying: 0.2mm≤H≤0.5mm.

[0029] Secondly, this application also proposes an electrical device, the electrical device including a battery pack, the battery pack including a first housing, a second housing and a bracket, the bracket having a hollow structure extending through its length;

[0030] The first housing has a cell cavity with an opening on one side, and the second housing covers the opening; the bracket is disposed inside the cell cavity and is in contact with the first housing and the second housing.

[0031] The technical solution of this application sets a hollow structure inside the bracket. When the bracket is subjected to external pressure or impact and deforms inward, the hollow structure inside the bracket can provide space for the bracket to deform, thereby alleviating stress concentration caused by external impact, reducing the probability of the bracket being damaged by stress, and extending the service life of the bracket. Attached Figure Description

[0032] Figure 1 A schematic diagram of the structure of the battery pack provided in this application at the bracket;

[0033] Figure 2 for Figure 1 A three-dimensional structural diagram of the central support;

[0034] Figure 3 for Figure 1 Side view of the central support;

[0035] Figure 4 for Figure 1 A magnified view of the area at point T;

[0036] Figure 5 for Figure 2 A magnified view of a portion at point S.

[0037] Explanation of reference numerals in the attached figures

[0038] 100-battery pack;

[0039] 1-First housing, 11-Cell cavity, 111-First mating surface;

[0040] 2-Second housing, 21-Second mating surface;

[0041] 3-Bracket, 31-Bracket body, 311-First end face, 312-Second end face, 313-Third end face, 314-Hollow structure, 3141-Horizontal section, 3142-Vertical section, 3143-Inclined section, 3144-First arc section, 3145-Second arc section, 315-Body part, 3151-Mounting hole, 3152-Allowing groove, 316-Protrusion, 32-Buffer layer, 33-Insulation layer

[0042] 4-Battery module, 41-Battery cell, 42-Fixing bracket. Detailed Implementation

[0043] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0044] In some embodiments of this application, the electrical device includes a load and a battery pack, the load being used to consume electrical power to perform a specific task or function, and the battery pack being used to provide electrical power to the load.

[0045] For example, taking a vehicle as an example, when the electrical equipment is a vehicle, the vehicle can be a gasoline-powered vehicle, an electric vehicle, or a hybrid vehicle; this application does not limit this. The vehicle includes a body, a battery pack, and a load. The body serves as the supporting frame of the vehicle, used to support and connect the various component assemblies. The body has a battery compartment, and the battery pack is housed within the battery compartment. The battery pack is electrically connected to the load, which can be an electric motor, an air conditioning system, a central control system, or even a lighting system, a heating system, etc. The battery pack provides power to these loads, thereby ensuring the normal operation of the vehicle and the implementation of its various functions.

[0046] Please refer to Figure 1 In some embodiments of this application, the battery pack 100 includes a first housing 1, a second housing 2, a battery module 4, and a bracket 3. The first housing 1 serves as the main structure of the battery pack 100, used to accommodate and connect the various component assemblies of the battery pack 100. The first housing 1 forms a cell cavity 11 with an opening on one side. The second housing 2 covers the opening of the cell cavity 11 to seal the cell cavity 11.

[0047] The battery module 4 is disposed within the cell cavity 11 to provide energy to the load. In some embodiments of this application, the battery module 4 includes multiple battery cells 41 connected in series or parallel, and a mounting bracket 42 for fixing each battery cell 41. The battery cell 41 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, or a secondary battery; this application does not impose any restrictions on this.

[0048] The cell cavity 11 of the first housing 1 has a first mating surface 111 formed on its cavity wall, and the cavity wall of the second housing 2 has a second mating surface 21 formed on its cavity wall. A bracket 3 is disposed between the first housing 1 and the second housing 2, and contacts the first mating surface 111 and the second mating surface 21, thereby providing support for the second housing 2's placement on the first housing 1 and improving the stability of the second housing 2's placement. The first mating surface 111 and the second mating surface 21 can be flat, inclined, or curved; this application does not impose any limitations on this.

[0049] However, due to space constraints in the battery pack 100, the bracket 3 itself must be designed compactly, which limits its strength and rigidity under load. Especially during long-term use, stress buildup can easily form inside the bracket 3. These stresses not only reduce the load-bearing capacity of the bracket 3, but may also cause fatigue deformation or cracks in the bracket 3, thus seriously affecting the support effect of the bracket 3 on the second housing 2.

[0050] For ease of explanation, the X direction in the diagram is the length direction of the support 3, and the Z direction is the height direction of the support 3.

[0051] Please refer to Figure 2 and Figure 3 To address the aforementioned issues, in this application, the support 3 includes a support body 31, which has a perforated structure 314 extending through its length X. The perforated structure 314 provides space for the deformation of the internal holes of the support 3 when it deforms inward under external pressure or impact, thereby alleviating stress concentration caused by external impact, reducing the probability of stress damage to the support 3, and extending the service life of the support 3.

[0052] On the other hand, the hollow structure 314 can also reduce the weight of the bracket 3, and thus the overall weight of the battery pack 100. When the battery pack 100 is used in vehicles and other vehicle facilities, the lighter battery pack 100 can effectively reduce vehicle energy consumption and extend vehicle range.

[0053] The hollow structure 314 can be rectangular, square, or other regular or irregular shapes, and this application does not limit this. In one embodiment of this application, along the length direction X of the support 3, the projection of the hollow structure 314 includes a horizontal segment 3141, a vertical segment 3142, and an inclined segment 3143. The first end of the horizontal segment 3141 is connected to the first end of the vertical segment 3142; the inclined segment 3143 is connected between the second end of the horizontal segment 3141 and the second end of the vertical segment 3142. That is, the hollow structure 314 is a triangular structure composed of the horizontal segment 3141, the vertical segment 3142, and the inclined segment 3143. Compared with other shapes, triangles have stronger stability, thus providing better support and resistance to deformation for the support 3. At the same time, compared with other shapes, triangles have stronger stability, thus providing better impact and deformation resistance for the hollow structure 314, reducing the possibility of the hollow structure 314 collapsing inward after the support 3 is subjected to force. Meanwhile, compared to other shapes, the triangular hollow structure 314 can transmit the force from the support 3 to the hollow part when the support 3 is subjected to gravity or external impact, and evenly transmit it to each vertex of the triangle along the three sides of the triangle, thereby avoiding excessive stress on one side or corner, improving the uniformity of stress on the hollow structure 314, and thus improving the support 3's resistance to bending and torsion.

[0054] In some embodiments of this application, the bracket 3 has a first end face 311 opposite to the second mating surface 21 of the second housing 2, and at least one inclined segment 3143 of the hollow structure 314 is arranged parallel to the first end face 311. This ensures that the pressure exerted by the second housing 2 on the bracket 3, after being transmitted to the first end face 311 via the second mating surface 21, is evenly transmitted to the inclined segment 3143, and then to other edge portions of the hollow structure 314 via the inclined segment 3143. This improves the uniformity of stress distribution on the hollow structure 314, reduces the possibility of localized deformation or cracking in certain areas of the hollow structure 314 due to stress accumulation, and extends the service life of the bracket 3.

[0055] In some embodiments of this application, the projection further includes a first arc segment 3144, a second arc segment 3145, and a third arc segment 3146; the first arc segment 3144 connects the horizontal segment 3141 and the inclined segment 3143; the second arc segment 3145 connects the vertical segment 3142 and the inclined segment 3143; and the third arc segment 3146 connects the vertical segment 3142 and the horizontal segment 3141. This arrangement, on the one hand, allows the first arc segment 3144, the second arc segment 3145, and the third arc segment 3146 to effectively and smoothly connect the horizontal segment 3141, the inclined segment 3143, and the vertical segment 3142, reducing the processing accuracy requirements of the hollow structure 314 and lowering the processing difficulty of the hollow structure 314. On the other hand, the first arc segment 3144, the second arc segment 3145 and the third arc segment 3146 can make the hollow structure 314 form a gradual geometric shape, so that the stress can be transferred more smoothly in the hollow structure 314, optimize the stress distribution at the edge of the hollow structure 314, reduce the possibility of deformation or cracking in some areas of the hollow structure 314 due to stress accumulation, and extend the service life of the bracket 3.

[0056] In some embodiments of this application, the length of the horizontal segment 3141 is A, the length of the vertical segment 3142 is B, the length of the inclined segment 3143 is C, and the radii of the first arc segment 3144, the second arc segment 3145, and the third arc segment 3146 are D, satisfying: 2mm≤A≤4mm; and / or 6mm≤B≤8mm; and / or 7mm≤C≤9mm; and / or 0.5mm≤D≤2mm. A can be 2mm, 2.5mm, 3mm, or 4mm; B can be 6mm, 6.5mm, 7mm, 7.5mm, or 8mm; and C can be 7mm, 7.5mm, 8mm, 8.5mm, or 9mm. This application does not impose any limitations on these dimensions. Under the above dimensional constraints, the hollow structure 314 can avoid excessively occupying the internal volume of the bracket 3, reducing the strength of the bracket 3, and effectively reducing the stress on the bracket 3, thus extending the service life of the bracket 3.

[0057] Please refer to Figure 1 In some embodiments of this application, the support 3 further includes a buffer layer 32, which is disposed between the support body 31 and the second housing 2 to form a buffer between the support body 31 and the second housing 2. Specifically, the support body 31 has a first end face 311 disposed opposite to the second mating surface 21 of the second housing 2, and the buffer layer 32 is disposed on the first end face 311 and fills the space between the first end face 311 and the second mating surface 21.

[0058] The buffer layer 32 can effectively absorb and reduce the impact force exerted by the second housing 2 on the support 3, thereby reducing the pressure and wear of the second housing 2 on the support 3 and extending the service life of the support 3. On the other hand, the buffer layer 32 can reduce the vibration transmission between the support 3 and the second housing 2 when the battery pack 100 moves with the electrical equipment, thereby reducing the noise generation of the battery pack 100 and improving the quietness of the electrical equipment.

[0059] The material of the buffer layer 32 can be foam, rubber, or silicone; this application does not impose any restrictions on this.

[0060] Overcharging, short circuits, and abnormal temperatures in the battery pack 100 can all lead to thermal runaway of the battery module 4 within it. To prevent thermal runaway of the battery module 4 from affecting other electronic units in the battery pack 100, in some embodiments of this application, the bracket 3 further includes an insulating layer 33. Specifically, in this embodiment, the bracket body 31 has a second end face 312 for being positioned relative to the battery module 4, and the insulating layer 33 is disposed on the second end face 312 and spaced apart from the battery module 4.

[0061] The insulating layer 33 can be made of mica sheet, polyester film, or polytetrafluoroethylene; this application does not limit the material of the insulating layer 33.

[0062] The insulating layer 33 is used to increase the resistance between the support body 31 and the battery module 4, thereby reducing the possibility of current breakdown between the battery module 4 and the support 3 when thermal runaway occurs, and reducing the short circuit risk of the battery pack 100. On the other hand, the insulating layer 33 can effectively block the heat transfer from the battery module 4 to the support 3 side, slow down the spread rate of thermal runaway of the battery module 4 in the battery pack 100, and improve the reliability of the battery pack 100.

[0063] Please refer to Figure 4 and Figure 5 In addition to providing support for the second housing 2, the bracket 3 can also be used as a fastener for the battery module 4. Specifically, in some possible embodiments of this application, the bracket body 31 includes a body portion 315 and a protrusion 316, and a hollow structure 314 is provided on the body portion 315; the body portion 315 has a third end face 313 disposed opposite to the first mating surface 111, and the protrusion 316 is provided on the third end face 313. The protrusion 316 is used to contact the first mating surface 111 to support the body portion 315 on the first mating surface 111.

[0064] The fixing bracket 42 is at least partially clamped between the first mating surface 111 and the third end surface 313. The body part 315 is also provided with a mounting hole 3151. The fasteners of the battery pack 100 can pass through the mounting hole 3151 to lock the bracket body 31 along with the fixing bracket 42 onto the first mating surface 111.

[0065] To reduce the installation difficulty between the body portion 315 and the first mating surface 111, in one embodiment of this application, the body portion 315 is provided with a clearance groove 3152, and a mounting hole 3151 is located at the bottom of the clearance groove 3152. Fasteners can extend into the mounting hole 3151 through the clearance groove 3152, thereby achieving the connection between the bracket 3 and the first mating surface 111. The clearance groove 3152 provides operating space for installation tools, thus reducing the installation difficulty between the bracket 3 and the first mating surface 111. Furthermore, compared to having the fastener pass directly through the top of the bracket 3, the clearance groove 3152 shortens the length of the mounting hole 3151, thereby shortening the length of the fastener and improving the stability of the connection between the fastener and the bracket 3 and the first mating surface 111.

[0066] Understandably, due to the existence of processing and assembly errors, the third end face 313 of the main body 315 and the fixing frame 42 cannot be tightly fitted. When the battery pack 100 moves with the electrical equipment, the fixing frame 42 may move between the third end face 313 and the first mating surface 111, which may cause the battery module 4 to be displaced or shaken in the cell cavity 11, leaving a safety hazard for the use of the battery pack 100.

[0067] To address the aforementioned issues, in one embodiment of this application, the protrusion 316 is spaced apart from the first mating surface 111. When the third end face 313 of the body portion 315 moves closer to the fixing frame 42 under the action of the fastener, this gap allows space for the movement of the body portion 315, thereby ensuring that the third end face 313 of the body portion 315 and the fixing frame 42 can achieve a tight fit, thus improving the stability of the battery module 4 within the cell cavity 11.

[0068] In some embodiments of this application, the distance between the protrusion 316 and the first mating surface 111 along the height direction Z of the battery pack 100 is H, satisfying: 0.2mm≤H≤0.5mm. Under this size constraint, it can be avoided that if the distance between the protrusion 316 and the first mating surface 111 is too small, there will not be enough deformation space between the bracket 3 and the first mating surface 111, which would affect the fixing effect of the bracket 3 on the battery module 4; and it can also be avoided that if the distance between the protrusion 316 and the first mating surface 111 is too large, the support effect of the bracket 3 on the second housing 2 will be reduced.

[0069] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications or equivalent substitutions made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery pack, characterized in that, include: The first housing has a cell cavity with an opening on one side. A second housing, the second housing being disposed over the opening; The bracket is disposed inside the cell cavity and supported between the first housing and the second housing. The bracket has a hollow structure that runs through it along its length.

2. The battery pack as described in claim 1, characterized in that, Along the length of the bracket, the projection of the hollow structure includes a horizontal segment, a vertical segment, and an inclined segment; The first end of the horizontal segment is connected to the first end of the vertical segment; the inclined segment is connected between the second end of the horizontal segment and the second end of the vertical segment.

3. The battery pack as described in claim 2, characterized in that, Along the length of the bracket, the projection of the hollow structure further includes a first arc segment, a second arc segment, and a third arc segment; the first arc segment connects the horizontal segment and the inclined segment; the second arc segment connects the vertical segment and the inclined segment; and the third arc segment connects the horizontal segment and the vertical segment.

4. The battery pack as described in claim 3, characterized in that, The bracket has a first end face that is disposed opposite to the second housing; At least one inclined segment of the hollow structure is arranged parallel to the first end face.

5. The battery pack as described in claim 3, characterized in that, The length of the horizontal segment is A, the length of the vertical segment is B, the length of the inclined segment is C, and the radii of the first arc segment, the second arc segment, and the third arc segment are D, satisfying: 2mm≤A≤4mm; and / or 6mm≤B≤8mm; and / or 7mm≤C≤9mm; and / or 0.5mm≤D≤2mm.

6. The battery pack as described in claim 1, characterized in that, The support includes a support body and a buffer layer, and the hollow structure is provided on the support body; the support body has a first end face for being disposed opposite to the second box. The buffer layer is disposed on the first end face.

7. The battery pack as described in claim 1, characterized in that, The battery pack also includes a battery module disposed within the cell cavity; The bracket includes a bracket body and an insulating layer, and the hollow structure is provided on the bracket body; The bracket body has a second end face for facing the battery module; the insulating layer is disposed on the second end face.

8. The battery pack as claimed in claim 1, characterized in that, The battery pack further includes a battery module disposed within the cell cavity; the battery module has a fixing frame, and the cell cavity has a first mating surface; The bracket is disposed between the first mating surface and the second housing. The bracket includes a bracket body, which includes a body portion and a protrusion. The hollow structure is disposed on the body portion. The body portion has a third end face that is disposed opposite to the first mating surface. At least a portion of the fixing frame is clamped between the first mating surface and the third end face. The protrusion extends from the third end face toward the first mating surface and is spaced apart from the first mating surface.

9. The battery pack as described in claim 8, characterized in that, Along the height direction of the battery pack, the distance H between the protrusion and the first mating surface satisfies: 0.2mm≤H≤0.5mm.

10. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-9.

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