Battery pack and electric device

Abstract

The present disclosure provides a battery pack and an electric device, the battery pack comprising: a box body comprising a frame and a bottom plate, the bottom plate and the frame being connected to form a containing cavity, at least one partition beam being arranged in the containing cavity; and a battery pack comprising a plurality of batteries, the batteries having a first bottom surface and a first top surface in a third direction, the first bottom surface being connected to the bottom plate; the partition beam having a second bottom surface and a second top surface in the third direction, a receiving groove being arranged in the partition beam between two adjacent battery compartments, and a support surface being formed on a side of the partition beam facing the opening; and the minimum distance between the first top surface and the support surface in the third direction being between 30mm and 100mm. Compared with the related art, the present disclosure sets the receiving groove on the partition beam and limits the distance range between the first top surface of the battery and the support surface of the receiving groove, thereby reducing the occupied space of the low-voltage connector in the height direction of the battery, reducing the overall height of the battery pack, and improving the volume utilization rate of the battery pack.

Description

Technical Field

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

[0002] In related technologies, battery packs generally adopt a dual-battery-compartment or multi-battery-compartment structure, with a partition beam between adjacent compartments. The low-voltage connector, serving as a signal channel between the battery management system and the external vehicle wiring harness, is usually located on top of the partition beam.

[0003] The top of the low-voltage connector needs to be higher than the top of the battery, which requires additional space between the top and the cover. To avoid the low-voltage connector, the cover must be raised as a whole, thereby increasing the overall height of the battery pack and reducing the ground clearance of the passenger compartment or chassis. Utility Model Content

[0004] The purpose of this disclosure is to provide a battery pack and electrical equipment to solve the technical problems in the related art, which reduces the space occupied by the low-voltage connector in the height direction of the battery and reduces the overall height of the battery pack.

[0005] In a first aspect, this disclosure provides a battery pack, comprising: The housing includes a frame and a bottom plate, the bottom plate and the frame are connected to form a receiving cavity, at least one partition beam is provided in the receiving cavity, the partition beam extends along a first direction and is fixedly connected to the frame, and a plurality of partition beams are spaced apart along a second direction to divide the receiving cavity into a plurality of battery compartments arranged sequentially along the second direction; A battery pack is housed within the battery compartment. The battery pack includes multiple batteries. Each battery has a first bottom surface and a first top surface along a third direction. The first bottom surface is connected to the base plate. The first direction, the second direction, and the third direction are perpendicular to each other. The partition beam has a second bottom surface and a second top surface along the third direction. The second bottom surface is connected to the bottom plate. A receiving groove is provided in the partition beam between two adjacent battery compartments. The receiving groove is used to receive a low-voltage connector. The receiving groove forms an opening on the second top surface. The partition beam forms a support surface on the side facing the opening. Along the third direction, the minimum distance between the first top surface and the supporting surface is between 30mm and 100mm.

[0006] Secondly, this disclosure provides an electrical device including the aforementioned battery pack.

[0007] Compared with related technologies, this disclosure provides a receiving groove on the partition beam and defines the distance range between the first top surface of the battery and the supporting surface of the receiving groove. The receiving groove at least partially houses the low-voltage connector inside the partition beam, and the top of the low-voltage connector is not higher than the first top surface of the battery. This reduces the space occupied by the low-voltage connector in the battery height direction, reduces the overall height of the battery pack, and improves the utilization rate of the battery pack volume. Attached Figure Description

[0008] Figure 1 This is a perspective view of the battery pack provided in this disclosure.

[0009] Figure 2 yes Figure 1 The battery pack shown is a top view.

[0010] Figure 3 yes Figure 2 A magnified structural diagram at point A.

[0011] Figure 4 yes Figure 1 A perspective view of the reinforcement components inside the battery pack shown.

[0012] Figure 5 yes Figure 1 The diagram shows a perspective view of the low-voltage connector inside the battery pack being assembled on a partition beam.

[0013] Figure 6 yes Figure 1 The side view shown shows the low-voltage connector inside the battery pack being assembled on the partition beam.

[0014] Figure 7 yes Figure 1 A perspective view of the partition beams inside the battery pack shown.

[0015] Figure 8 yes Figure 1 Side view of the partition beam inside the battery pack shown.

[0016] Figure 9 yes Figure 1 A top view of the partition beam inside the battery pack shown.

[0017] Figure 10 yes Figure 1 The diagram shows the structure of the battery pack with the separator beam abutting against the battery.

[0018] Explanation of reference numerals in the attached figures: 10-Box body, 11-Frame, 12-Bottom plate, 13-Receiving cavity, 131-Electrical compartment, 132-Battery compartment, 14-Divider beam, 141-Second bottom surface, 142-Second top surface, 143-Receiving slot, 144-Supporting surface, 145-First beam, 146-Second beam, 147-Supporting plate, 148-First mounting hole, 149-Second mounting hole; 20 - Battery pack, 21 - Battery, 211 - First bottom surface, 212 - First top surface; 30 - Reinforcing member, 31 - First connecting surface, 32 - Second connecting surface, 33 - Third connecting surface, 34 - Weight reduction hole; 40 - Low-voltage connector; D1 - First direction; D2 - Second direction; D3-Third direction. Detailed Implementation

[0019] The embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this disclosure, and should not be construed as limiting this disclosure.

[0020] like Figures 1 to 10 As shown, an embodiment of this disclosure provides a battery pack, including a housing 10 and a battery pack 20 housed within the housing 10.

[0021] To better illustrate the internal structure of the battery pack provided in the embodiments of this disclosure, this disclosure defines a first direction D1, a second direction D2, and a third direction D3. The first direction D1, the second direction D2, and the third direction D3 are perpendicular to each other, and all three directions extend bidirectionally. For example, the first direction D1 can be defined as the +X-axis direction and the -X-axis direction, the second direction D2 can be defined as the +Y-axis direction and the -Y-axis direction, and the third direction D3 can be defined as the +Z-axis direction and the -Z-axis direction. The first direction D1, the second direction D2, and the third direction D3 together constitute a three-dimensional coordinate system. In the embodiments provided in this disclosure, the first direction D1 is exemplarily defined as the width direction of the housing 10, the second direction D2 is the length direction of the housing 10, and the third direction D3 is the height direction of the housing 10.

[0022] In the embodiments provided in this disclosure, the housing 10 is a closed or semi-closed structure, and a receiving cavity 13 is formed inside the housing 10. The battery pack 20 and accessories are arranged in the receiving cavity 13. Multiple batteries 21 with similar capacity and internal resistance are connected in series or parallel to form the battery pack 20. The battery 21 can store chemical energy and controllably convert chemical energy into electrical energy. In the recyclable battery 21, the active material can be activated by charging after discharge and continue to be used. The battery 21 includes a casing and a cell disposed inside the casing. The receiving cavity 13 provides installation space for the battery pack 20, battery management system, cooling system, electrical connection components, etc., ensuring that they maintain a relatively stable position during battery pack operation and avoiding damage to components or loosening of connections due to vibration, impact, or other factors. The housing 10 can be cast from materials such as steel plate or aluminum alloy, or lightweight materials such as glass fiber reinforced composite materials or carbon fiber reinforced composite materials. The shape of the housing 10 can be cylindrical, cuboid, cube, etc., and is not limited herein.

[0023] In one possible embodiment, the box body 10 includes a frame 11, a bottom plate 12, and a lid (not shown). The bottom plate 12 and the frame 11 are connected to form a receiving cavity 13. The receiving cavity 13 has an opening on the side opposite to the bottom plate 12. The lid is designed to be detachable or sealable. The lid is attached to the frame 11 to close the opening, thereby achieving protection and sealing.

[0024] The enclosure 11 serves as the frame structure of the box 10, providing support, protection, and connection. The enclosure 11 can be formed by splicing together multiple beams. In one feasible embodiment, the enclosure 11 includes four sub-frames, connected end-to-end to form an enclosed space, which is then sealed by a box cover and a bottom plate 12 to form a receiving cavity 13. The enclosure 11 can be made of various materials, such as aluminum alloy, copper alloy, steel, or plastic. The enclosure 11 can be rectangular, circular, polygonal, etc., with no specific limitation. The interior of the enclosure 11 can be a solid structure or contain a cavity.

[0025] The base plate 12 is the main load-bearing component of the battery pack, typically a structural member installed at the bottom of the battery pack, used to support and secure the battery pack 20, battery management system, cooling system, and other components inside the battery pack. The bottom surface of the battery 21 is fixed to the upper part of the base plate 12 by structural adhesive or bolts. A thermally conductive silicone pad (for heat dissipation) or a foam cushioning pad (for shock absorption) can be laid between the battery pack 20 and the base plate 12.

[0026] The base plate 12 is located at the bottom of the frame 11. For example, the base plate 12 can be fixed to the bottom of the frame 11 by welding, riveting, screwing, or other methods, or it can be integrally formed with the frame 11. The base plate 12 can be made of various materials, such as aluminum alloy, steel, stainless steel, and other high-strength materials. The base plate 12 can be rectangular, circular, polygonal, or a plate-like structure; there are no specific limitations. Its size is determined by the number of batteries 21 contained in the battery pack and the size of the batteries 21.

[0027] At least one partition beam 14 is provided inside the receiving cavity 13. The partition beam 14 extends along the first direction D1 and is fixedly connected to the surrounding frame 11. The two ends of the partition beam 14 can be fixed to opposite sides of the surrounding frame 11 by riveting or welding to improve the bending strength of the surrounding frame 11 and improve the structural stability of the box 10. At the same time, the beam body of the partition beam 14 serves as a lateral limiting wall for the large surface of the battery 21, suppressing the bulging deformation of the battery 21 shell and reducing fatigue cracks generated by the battery 21 when it vibrates or bulges.

[0028] The partition beam 14 can be made of metal, such as aluminum, or it can be integrally molded by rubber injection molding, plastic injection molding, or molding injection molding. The plastic used in plastic injection molding can be polyethylene, polypropylene, ABS, PA, polystyrene, etc. The partition beam 14 can be formed by die casting or other methods such as extrusion molding.

[0029] Multiple partition beams 14 are spaced apart along the second direction D2 to divide the accommodating cavity 13 into an electrical compartment 131 and multiple battery compartments 132 arranged sequentially along the second direction D2. The electrical compartment 131 contains electrical components such as high-voltage connectors, fuses, and relays, while the battery compartments 132 contain batteries 21. The battery compartments 132 are independent of each other, achieving failure isolation and thermal runaway zoning management.

[0030] Battery pack 20 is housed within battery compartment 132. Battery pack 20 includes multiple batteries 21, see reference. Figure 10 As shown, the battery 21 has a first bottom surface 211 and a first top surface 212 along the third direction D3, and the first bottom surface 211 is connected to the base plate 12.

[0031] Reference Figures 5 to 10As shown, the partition beam 14 has a second bottom surface 141 and a second top surface 142 along the third direction D3. The second bottom surface 141 is connected to the bottom plate 12. A receiving groove 143 is provided in the partition beam 14 between two adjacent battery compartments 132. The receiving groove 143 is used to receive the low-voltage connector 40. The receiving groove 143 forms an opening on the second top surface 142. A support surface 144 is formed on the side of the partition beam 14 facing the opening. The low-voltage connector 40 can be installed on the support surface 144. The receiving groove 143 at least partially receives the low-voltage connector 40 inside the partition beam 14. The top end of the low-voltage connector 40 extends out of the receiving groove 143 from the opening of the receiving groove 143. The top end of the low-voltage connector 40 is higher than the second top surface 142. The distance by which the low-voltage connector 40 protrudes from the second top surface 142 is defined by the depth of the receiving groove 143 and the height of the low-voltage connector 40. The top of the low-voltage connector 40 is not higher than the first top surface 212 of the battery 21, thereby reducing the space occupied by the low-voltage connector 40 in the height direction of the battery 21, reducing the overall height of the battery pack, and improving the utilization rate of the battery pack volume.

[0032] Furthermore, along the third direction D3, the minimum distance between the first top surface 212 and the supporting surface 144 is between 30mm and 100mm. The value can be 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, or 100mm, and can be any value between 30mm and 100mm, specifically the values ​​listed above.

[0033] If the minimum spacing is too small, the receiving groove 143 will be too shallow or the partition beam 14 will be too high. Although the top of the low-voltage connector 40 is still lower than the first top surface 212 of the battery 21, the gap between the low-voltage connector 40 and the inner surface of the cover will be too small, posing a risk of interference and compression when the cover is closed or under vibration conditions. If the receiving groove 143 is too shallow, the low-voltage connector 40 will sink less into the receiving groove 143. Under vibration conditions, the exposed part of the low-voltage connector 40 will lack the lateral support of the groove wall of the receiving groove 143. The part where the low-voltage connector 40 abuts against the second top surface 142 of the partition beam 14 is prone to stress concentration, leading to fatigue damage. If the partition beam 14 is too high, it will increase the amount of beam material used in the partition beam 14, increasing the weight of the battery pack.

[0034] If the minimum spacing is too large, the receiving groove 143 will be too deep or the separator beam 14 will be too short. If the receiving groove 143 is too deep, it will significantly weaken the bending stiffness and structural strength of the separator beam 14 in the third direction D3 (the height direction of the battery 21), making the separator beam 14 more prone to deformation when subjected to the expansion force and vibration load of the battery 21, thus affecting the overall structural stability of the battery pack. If the separator beam 14 is too short, its height will be too small relative to the height of the battery 21, failing to effectively limit the expansion or displacement of the battery 21. The point of application of the expansion force of the battery 21 will be close to the top edge of the separator beam 14, causing stress concentration at the edge of the separator beam 14 in contact with the battery 21, increasing the local contact pressure, causing the battery 21 casing to be recessed, which may then squeeze the electrode plates inside the battery 21 and cause an internal short circuit.

[0035] In one feasible implementation, along the third direction D3, the minimum distance between the second top surface 142 and the support surface 144 is between 30mm and 80mm. The value can be 30mm, 40mm, 50mm, 60mm, 70mm or 80mm, and can be any value between 30mm and 80mm, specifically the values ​​listed above.

[0036] If the minimum spacing is too small, the receiving groove 143 will be too shallow, resulting in the low-voltage connector 40 sinking less into the receiving groove 143. Under vibration conditions, the exposed part of the low-voltage connector 40 lacks the lateral support of the groove wall of the receiving groove 143. The part where the low-voltage connector 40 abuts against the second top surface 142 of the partition beam 14 is prone to stress concentration, leading to fatigue damage.

[0037] If the minimum spacing is too large, the receiving groove 143 will be too deep, which will weaken the bending stiffness and structural strength of the partition beam 14 in the third direction D3 (the height direction of the battery 21), making the partition beam 14 more prone to deformation when subjected to the expansion force and vibration load of the battery 21, thus affecting the overall structural stability of the battery pack.

[0038] In one feasible implementation, along the second direction D2, the ratio of the minimum dimension of the receiving groove 143 to the minimum dimension of the partition beam 14 is between 0.2 and 0.6. The value can be 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, or 0.6, and can specifically be one of the values ​​listed above, or any value between 0.2 and 0.6.

[0039] If this ratio is too small, the width of the receiving groove 143 will be too narrow relative to the width of the partition beam 14, and the space margin of the low-voltage connector 40 in the receiving groove 143 along the second direction D2 will be small, which will increase the difficulty of assembly work. Furthermore, when the partition beam 14 undergoes bending deformation, it will transfer more force to the low-voltage connector 40, causing damage to the low-voltage connector 40.

[0040] If this ratio is too large, the width of the receiving groove 143 will be excessively expanded relative to the width of the partition beam 14. This will excessively weaken the bending stiffness and structural strength of the partition beam 14 in the second direction D2 (the width direction of the battery 21), making the partition beam 14 more prone to deformation when subjected to the expansion force and vibration load of the battery 21, thus affecting the overall structural stability of the battery pack. At the same time, the lateral restraint capability of the partition beam 14 on the low-voltage connector 40 will be reduced. Under vibration conditions, the swing amplitude of the low-voltage connector 40 along the second direction D2 will increase, which will easily cause stress concentration in the contact area between the low-voltage connector 40 and the second top surface 142, leading to fatigue damage.

[0041] In the embodiments provided in this disclosure, the partition beam 14 includes a first beam 145, a second beam 146, and a support plate 147. The second beam 146 is located on the side of the first beam 145 away from the bottom plate 12. The first beam 145 and the second beam 146 are preferably integrally formed to form an integral structure.

[0042] The side of the first beam 145 facing away from the first beam 145 forms a second bottom surface 141, and the side of the second beam 146 facing away from the first beam 145 forms a second top surface 142. The two second beams 146 are spaced apart along the second direction D2, and a receiving groove 143 is formed between the two second beams 146. The first beam 145 abuts against the battery 21, which can transfer the expansion force and vibration load of the battery 21 to the frame 11 and the base plate 12. The two second beams 146 are parallel and opposite, and the space between them forms the receiving groove 143. The width of the receiving groove 143 is equal to the distance between the inner sides of the two second beams 146. Setting the receiving groove 143 in the partition beam 14 does not occupy additional lateral space of the battery compartment 132, and therefore does not reduce the energy density of the battery pack.

[0043] A support plate 147 is disposed within a receiving groove 143, and a support surface 144 is formed on the side of the support plate 147 facing the opening. The two ends of the support plate 147 are fixed to the inner sides of two second beams 146. The support surface 144 is lower than the second top surface 142, and the extension direction of the support surface 144 is perpendicular to the third direction D3. The bottom surface of the low-voltage connector 40 abuts against the support surface 144. While providing a load-bearing function, the support surface 144 can also provide a horizontal positioning reference, so that the top of the low-voltage connector 40 is not higher than the first top surface 212 of the battery 21. This reduces the space occupied by the low-voltage connector 40 in the height direction of the battery 21, reduces the overall height of the battery pack, and improves the utilization rate of the battery pack volume.

[0044] In one feasible implementation, the edge of the second beam 146 is offset from the edge of the first beam 145, and the edge of the second beam 146 is further away from the battery 21 than the edge of the first beam 145, while the battery 21 abuts against the first beam 145. Along the second direction D2, the minimum distance between the side surface of the first beam 145 and the side surface of the second beam 146 is between 0.5mm and 8mm. The value can be 0.5mm, 1mm, 1.5mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, or 8mm, specifically the values ​​listed above, or any value between 0.5mm and 8mm.

[0045] If this minimum spacing is too small, the distance by which the edge of the second beam 146 is misaligned inward relative to the edge of the first beam 145 will be too small. In order to maintain the appropriate width of the receiving groove 143, the wall thickness of the second beam 146 needs to be increased, resulting in an increase in the amount of beam material used and an increase in the weight of the battery pack.

[0046] If this minimum spacing is too large, the inward misalignment of the edge of the second beam 146 relative to the edge of the first beam 145 will be too great. To maintain the appropriate width of the receiving groove 143, the wall thickness of the second beam 146 needs to be reduced. Under the coupled action of the expansion force of the battery 21 and the vibration load, the root of the second beam 146 is prone to buckling and bending, which in turn causes the support plate 147 to deform, making the connection terminals of the low-voltage connector 40 susceptible to fatigue bending damage. Furthermore, the expansion force of the battery 21 is mainly concentrated on the top edge of the first beam 145, forming a line contact stress concentration. The local contact pressure of the battery 21 shell increases, causing the battery 21 shell to be recessed, which may in turn squeeze the electrode plates inside the battery 21 and cause an internal short circuit.

[0047] Furthermore, along the third direction D3, the ratio of the size of the first beam 145 to the size of the battery 21 is between 0.4 and 0.7. The value can be 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, or 0.7, and can specifically be the values ​​listed above, or any value between 0.4 and 0.7.

[0048] If this ratio is too small, the height of the first beam 145 will be too small relative to the height of the battery 21, failing to effectively limit the expansion or displacement of the battery 21. The expansion force of the battery 21 will mainly concentrate at the top edge of the first beam 145, forming a line contact stress concentration. This will increase the local contact pressure of the battery 21 casing, causing the battery 21 casing to indent, which may then squeeze the internal electrodes of the battery 21, leading to an internal short circuit. The first beam 145 is also more prone to deformation and fatigue damage when subjected to the expansion force and vibration load of the battery 21.

[0049] If this ratio is too large, the height of the first beam 145 will be too large relative to the height of the battery 21, which will force the height of the second beam 146 to decrease. This may result in the receiving groove 143 being too shallow, causing the low-voltage connector 40 to sink less into the receiving groove 143. Under vibration conditions, the exposed part of the low-voltage connector 40 lacks the lateral support of the side wall of the receiving groove 143. The part where the low-voltage connector 40 abuts against the second top surface 142 of the partition beam 14 is prone to stress concentration, leading to fatigue damage.

[0050] In one feasible implementation, refer to Figure 9 As shown, the second beam 146 has a notch corresponding to the mounting position of the low-voltage connector 40 on the partition beam 14. The notch extends in the third direction D3 until it connects to the second top surface 142. The second beam 146 is partially cut out in the mounting area corresponding to the low-voltage connector 40, forming a notch that extends in the third direction D3 to the second top surface 142. This notch makes the second beam 146 have a concave cross-section at this location.

[0051] The second beam 146 has a plurality of first mounting holes 148 at the bottom of the notch, and the plurality of first mounting holes 148 are spaced apart along the first direction D1. The axis of the first mounting holes 148 is parallel to the third direction D3, providing fixing points for the low-voltage connector 40 and the wire harness bracket, and can also serve as a positioning reference for assembling the low-voltage connector 40 to determine that the low-voltage connector 40 is in a preset position. The notch is used to lower the mounting surface of the low-voltage connector 40 to below the second top surface 142, ensuring that the mounting part of the low-voltage connector 40 is not higher than the first top surface 212 of the battery 21.

[0052] During assembly, the low-voltage connector 40 is placed into the receiving groove 143 and pressed against the support plate 147. The mounting surface of the low-voltage connector 40 aligns with the bottom of the notch. Fasteners pass through the reserved holes on the mounting surface of the low-voltage connector 40 and the first mounting hole 148, and are then locked in place by threaded engagement. The low-voltage connector 40 is locked along the first direction D1 by an array of fasteners. During maintenance, it is only necessary to loosen the fasteners in the first mounting hole 148 to pull out the low-voltage connector 40 along the third direction D3, which is convenient and quick.

[0053] In one feasible implementation, refer to Figure 7 as well as Figure 8 As shown, the support plate 147 is provided with a second mounting hole 149. The shape of the second mounting hole 149 can be round, oblong, or stepped countersunk. A plurality of second mounting holes 149 are spaced apart along the first direction D1. The second mounting hole 149 is used to install the body of the low-voltage connector 40. A metal insert or injection-molded threaded sleeve can be pressed into the second mounting hole 149. The base of the body of the low-voltage connector 40 is locked in the second mounting hole 149 by screws, realizing a rigid connection between the low-voltage connector 40 and the support plate 147.

[0054] Simultaneously, the second mounting hole 149 can also serve as a weight-reduction hole and a through hole for the wire harness. This reduces the weight of the support plate. The second mounting hole 149 is preferably located in the middle of the support plate 147 to minimize its impact on the strength of the support plate 147 and avoid excessively reducing the bending moment of inertia of the support plate 147. The wire harness can pass through the second mounting hole 149 and enter the wire harness channel below the support plate 147, providing space for the insertion and removal of the low-voltage connector 40 and reducing assembly difficulty.

[0055] To improve the reliability of the partition beam 14 in resisting the bulging deformation of the battery 21 and to prevent the partition beam 14 from failing due to the compression load of the bulging battery 21, in one feasible embodiment, refer to Figure 3 as well as Figure 4 As shown, a reinforcing member 30 is provided inside the housing 10. The reinforcing member 30 provides additional structural support for the partition beam 14 and the housing 10, ensuring that the partition beam 14 and the housing 10 remain stable when subjected to the swelling force of the battery 21 and vibration loads. The reinforcing member 30 is preferably made of a high-strength material, such as aluminum alloy or high-strength steel, to ensure the structural stability of the reinforcing member 30 under high loads and to withstand repeated loads over a long period of time.

[0056] Reference Figure 3 as well as Figure 4 As shown, the reinforcing member 30 has a first connecting surface 31, a second connecting surface 32, and a third connecting surface 33. The first connecting surface 31 is fixedly connected to the frame 11 by riveting or welding, etc., to better transfer circumferential loads, enhance the structural strength of the box 10 in the circumferential direction, and improve the stability of the frame 11. The second connecting surface 32 is fixedly connected to the partition beam 14 by riveting or welding, etc., to better transfer circumferential loads, enhance the structural strength of the partition beam 14 in the circumferential direction, and improve the stability of the partition beam 14. The third connecting surface 33 is fixedly connected to the base plate 12 by riveting or welding, etc., to better transfer vertical loads, and enhance the structural strength and compressive strength of the base plate 12.

[0057] The reinforcing member 30 is fixedly connected to the frame 11, the partition beam 14 and the base plate 12 respectively, forming a three-dimensional structural support. This allows the reinforcing member 30 to transfer and distribute the load from multiple directions, reduce local stress concentration, enhance the overall structural strength of the box 10 and the partition beam 14, and reduce the risk of deformation and damage.

[0058] In one feasible implementation, the first connecting surface 31 and the second connecting surface 32 are located on the sides of the reinforcing member 30. The normal directions of both the first connecting surface 31 and the second connecting surface 32 are perpendicular to the third direction D3. The reinforcing member 30 can be connected to the frame 11 and the partition beam 14 respectively through these two sides, so that the reinforcing member 30 can effectively transfer the horizontal load to the frame 11 and the partition beam 14. The third connecting surface 33 is located on the bottom surface of the reinforcing member 30. The normal direction of the third connecting surface 33 is parallel to the third direction D3, so that the reinforcing member 30 can effectively transfer the vertical load to the bottom plate 12. This effectively enhances the structural strength and overall stability of the box 10 in both vertical and horizontal directions.

[0059] Furthermore, referring to Figure 4 As shown, the reinforcing member 30 is provided with a plurality of weight-reducing holes 34. The plurality of weight-reducing holes 34 extend along the third direction D3 until they penetrate the reinforcing member 30. The weight-reducing holes 34 extend from the top to the bottom of the reinforcing member 30 to form through holes, so as to reduce the weight of the reinforcing member 30. The number of weight-reducing holes 34 can be determined according to actual needs, so as to achieve lightweight design while meeting the structural strength requirements, thereby reducing the weight of the entire battery pack.

[0060] In the embodiments provided in this disclosure, the first connecting surface 31 is welded to the frame 11 to form a plurality of first weld marks. The first weld marks are connection points formed during the welding process. The connection between the reinforcing member 30 and the frame 11 is discontinuous, and the plurality of first weld marks are spaced apart along a third direction D3. The minimum spacing between adjacent first weld marks is between 10mm and 40mm. The value can be 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, or 40mm, and can specifically be the values ​​listed above, or any value between 10mm and 40mm. This ensures the strength of the welded connection while avoiding excessively dense first weld marks, which could reduce the structural strength of the frame 11 due to heat during the welding process.

[0061] If the minimum spacing between adjacent first weld marks is too small, the heat generated during the welding process will overlap, the heat-affected zone of the weld will increase, and the welding time will be too long, resulting in a decrease in the overall strength of the frame 11. The frame 11 is more prone to deformation and fatigue damage when subjected to impact and vibration loads.

[0062] If the minimum spacing between adjacent first weld marks is too large, the distance between welded joints increases, resulting in insufficient connection strength between the reinforcing member 30 and the frame 11. The material between the joints cannot effectively transfer the load, leading to deformation of the frame 11 or the partition beam 14, as well as fatigue cracking.

[0063] In the embodiments provided in this disclosure, the second connecting surface 32 is welded to the partition beam 14 to form a plurality of second weld marks. These second weld marks are connection points formed during the welding process. The connection between the reinforcing member 30 and the partition beam 14 is discontinuous, and the plurality of second weld marks are spaced apart along a third direction D3. The minimum spacing between adjacent second weld marks is between 10mm and 40mm. The value can be 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, or 40mm, specifically the values ​​listed above, or any value between 10mm and 40mm. This ensures the strength of the welded connection while preventing the second weld marks from being too dense, which could reduce the structural strength of the partition beam 14 due to heat during welding.

[0064] If the minimum spacing between adjacent second weld marks is too small, the heat generated during the welding process will overlap, the heat-affected zone of the weld will increase, and the welding time will be too long, resulting in a decrease in the overall strength of the partition beam 14. The partition beam 14 is more prone to deformation and fatigue damage when subjected to impact and vibration loads.

[0065] If the minimum spacing between adjacent second weld marks is too large, the distance between the welded joints increases, resulting in insufficient connection strength between the reinforcing member 30 and the partition beam 14. The material between the joints cannot effectively transfer the load, leading to deformation of the frame 11 or the partition beam 14, as well as fatigue cracking.

[0066] Secondly, this disclosure provides an electrical device that may include the aforementioned battery pack.

[0067] Battery 21 can serve as an operating power source for electrical equipment, or as a driving power source for electrical equipment, replacing or partially replacing fuel or natural gas to provide driving power for vehicles. Electrical equipment includes numerous technological fields such as electric ships, aircraft, laptops, power tools, electric bicycles, electric motorcycles, electric cars, military equipment, and aerospace.

[0068] In addition, electrical equipment can also be used for the storage, conversion, and release of recyclable electrical energy.

[0069] The above description, based on the embodiments shown in the figures, details the structure, features, and effects of this disclosure. The above description is only a preferred embodiment of this disclosure, but this disclosure does not limit the scope of implementation to what is shown in the figures. Any changes made in accordance with the concept of this disclosure, or modifications to equivalent embodiments with equivalent changes, that do not exceed the spirit covered by the specification and figures, should be within the protection scope of this disclosure.

Claims

1. A battery pack, characterized in that, include: The housing includes a frame and a bottom plate, the bottom plate and the frame are connected to form a receiving cavity, at least one partition beam is provided in the receiving cavity, the partition beam extends along a first direction and is fixedly connected to the frame, and a plurality of partition beams are spaced apart along a second direction to divide the receiving cavity into a plurality of battery compartments arranged sequentially along the second direction; A battery pack is housed within the battery compartment. The battery pack includes multiple batteries. Each battery has a first bottom surface and a first top surface along a third direction. The first bottom surface is connected to the base plate. The first direction, the second direction, and the third direction are perpendicular to each other. The partition beam has a second bottom surface and a second top surface along the third direction. The second bottom surface is connected to the bottom plate. A receiving groove is provided in the partition beam between two adjacent battery compartments. The receiving groove is used to receive a low-voltage connector. The receiving groove forms an opening on the second top surface. The partition beam forms a support surface on the side facing the opening. Along the third direction, the minimum distance between the first top surface and the supporting surface is between 30mm and 100mm.

2. The battery pack according to claim 1, characterized in that: Along the third direction, the minimum distance between the second top surface and the supporting surface is between 30mm and 80mm.

3. The battery pack according to claim 1, characterized in that: Along the second direction, the ratio of the minimum dimension of the receiving groove to the minimum dimension of the partition beam is between 0.2 and 0.

6.

4. The battery pack according to claim 1, characterized in that: The partition beam includes a first beam, a second beam, and a support plate, wherein the second beam is located on the side of the first beam away from the bottom plate, and wherein: The side of the first beam away from the first beam forms the second bottom surface; The second beam has a second top surface formed on the side opposite to the first beam, and the two second beams are spaced apart along the second direction, with the receiving groove formed between the two second beams; The support plate is disposed in the receiving groove, and the support surface is formed on the side of the support plate facing the opening.

5. The battery pack according to claim 4, characterized in that: Along the second direction, the minimum distance between the side of the first beam and the side of the second beam is between 0.5 mm and 8 mm.

6. The battery pack according to claim 5, characterized in that: Along the third direction, the ratio of the size of the first beam to the size of the battery is between 0.4 and 0.

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7. The battery pack according to claim 4, characterized in that: The second beam has a notch that connects to the second top surface. The second beam has a plurality of first mounting holes at the bottom of the notch, and the plurality of first mounting holes are spaced apart along the first direction.

8. The battery pack according to claim 4, characterized in that: The support plate is provided with a second mounting hole, and a plurality of the second mounting holes are spaced apart along the first direction.

9. The battery pack according to claim 1, characterized in that: The box is equipped with a reinforcing member, which has a first connecting surface, a second connecting surface and a third connecting surface. The first connecting surface is fixedly connected to the frame, the second connecting surface is fixedly connected to the partition beam, and the third connecting surface is fixedly connected to the bottom plate.

10. The battery pack according to claim 9, characterized in that: The first connecting surface and the second connecting surface are located on the side of the reinforcing member, and the normal directions of the first connecting surface and the second connecting surface are both perpendicular to the third direction; the third connecting surface is located on the bottom surface of the reinforcing member, and the normal direction of the third connecting surface is parallel to the third direction.

11. The battery pack according to claim 9, characterized in that: The first connecting surface is welded to the frame to form a plurality of first weld marks, which are spaced apart along the third direction, with the minimum spacing between adjacent first weld marks being between 10mm and 40mm.

12. The battery pack according to claim 9, characterized in that: The second connecting surface is welded to the partition beam to form a plurality of second weld marks. The plurality of second weld marks are spaced apart along the third direction, and the minimum spacing between adjacent second weld marks is between 10mm and 40mm.

13. The battery pack according to claim 9, characterized in that: The reinforcing member is provided with a plurality of weight-reducing holes, which extend along the third direction until they penetrate the reinforcing member.

14. An electrical appliance, characterized in that, The battery pack includes any one of claims 1-13.

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