Battery pack and electric device

Abstract

The battery pack comprises a box body and a plurality of battery monomers arranged in the box body, and the box body comprises a first side beam, the length direction of the first side beam is parallel to the arrangement direction of the plurality of battery monomers; the first side beam has oppositely arranged first and second side walls, the first side wall is located on the outside of the box body, and the second side wall is located on the inside of the box body; a plurality of support ribs are arranged between the first and second side walls, the two ends of each support rib are located on the first and second side walls respectively, the length of at least one support rib in the plurality of support ribs is greater than the distance between the first and second side walls, the thickness of the at least one support rib is d1 mm, the thickness of the first side wall is d2 mm, and 0.25≤d1 mm / d2 mm≤0.9. When the first side beam is impacted by external force, the impact force transmitted to the battery monomers is reduced, and the risk of deformation or even short circuit of the battery monomers is reduced.

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] Battery packs, used for storing and supplying electrical energy, are widely used in various devices. A battery pack consists of multiple individual cells and a housing. Besides providing space for the cells, the housing primarily protects the battery pack. Therefore, the housing is typically designed for high strength, exhibiting strong resistance to deformation when subjected to external impacts, preventing deformation that could crush the internal battery cells.

[0003] However, the high strength of the enclosure makes it difficult to deform, which means that external forces can be transmitted inward through the enclosure. Ultimately, the impact force will be transmitted to the battery cells, causing deformation or even short circuits in the battery cells. Utility Model Content

[0004] In view of this, the present disclosure provides a battery pack and electrical device, which aims to at least improve the problem of external force being transmitted to the battery cells through the housing, causing deformation of the battery cells.

[0005] On one hand, this disclosure provides a battery pack, which includes a housing and a plurality of battery cells arranged in the housing. The housing includes a first side beam, the length direction of which is parallel to the arrangement direction of the plurality of battery cells. The first side beam has a first side wall and a second side wall disposed opposite to each other, the first side wall being located on the outside of the housing and the second side wall being located on the inside of the housing. A plurality of support ribs are provided between the first side wall and the second side wall, the two ends of each support rib being located on the first side wall and the second side wall respectively, and at least one of the plurality of support ribs having a length greater than the distance between the first side wall and the second side wall.

[0006] On the other hand, this disclosure also provides an electrical device that includes the battery pack described above.

[0007] According to the battery pack and battery cell provided in this disclosure, by providing support ribs that are more prone to deformation inside the first side beam, when the first side beam is impacted by an external force, the internal support ribs will deform first. In this way, the first side beam can absorb part of the impact force during the deformation process, greatly reducing the impact force transmitted to the battery cell and reducing the risk of deformation or even short circuit of the battery cell. Attached Figure Description

[0008] It should be understood that the following figures only illustrate certain embodiments of this disclosure and should not be construed as limiting the scope.

[0009] It should be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0010] It should be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0011] Figure 1 This is a schematic diagram of an exemplary battery pack.

[0012] Figure 2 for Figure 1 The diagram shows the structure of the battery pack from one perspective.

[0013] Figure 3 for Figure 2 Cross-sectional view along the BB direction.

[0014] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0015] Figure 5 This is a schematic diagram of the relevant dimensions in the first side beam.

[0016] Explanation of reference numerals in the attached drawings: 100, battery pack; 10, housing; 11, first side beam; 111, first side wall; 112, second side wall; 113, protrusion; 114, first support rib; 115, second support rib; 116, third support rib; 117, fourth support rib; T, reinforcing part; 12, second side beam; 20, battery cell; 30, base plate. Detailed Implementation

[0017] Numerous specific details are set forth below to provide an understanding of the structure, function, and use of the embodiments described and illustrated in the specification and figures. It is to be understood that the embodiments described and illustrated herein are non-limiting examples, and thus it will be appreciated that the particular structural and functional details disclosed herein are representative and exemplary. Variations and changes may be made to these embodiments without departing from the scope of the claims.

[0018] In related technologies, due to the fixed installation method of battery packs in vehicles and other electrical equipment, battery packs are often subjected to lateral force impacts. This lateral force can be understood as a force parallel to the width direction of the battery pack. This lateral force acts directly on the side beams extending along the length direction of the battery pack.

[0019] To ensure the protective function of the side beams for the battery cells, they are typically designed with high strength. Existing technologies often use solid side beams. However, to achieve battery pack weight reduction, most designs also use hollow side beams with reinforcing ribs to improve their deformation resistance. Although the strength is slightly lower than a solid structure, these reinforcing ribs are often parallel to the direction of lateral force transmission and possess high strength. When the battery pack is subjected to a lateral force impact, the side beams still exhibit high resistance to deformation. The lateral force, under the action of the reinforcing ribs, continues to be transmitted towards the battery cells along the direction of the ribs. Ultimately, almost all of the lateral force is transmitted to the battery cells, causing them to deform or even short-circuit under the influence of the lateral force.

[0020] The inventors discovered that the reason for the above problems is that the first side beam has high strength and a high resistance to deformation. When subjected to external impact, it is not easy to deform, and thus almost all the impact force is transmitted to the battery cell through the first side beam.

[0021] To address the aforementioned problems, the inventors made numerous attempts and ultimately creatively proposed the following technical solution: By incorporating easily deformable support ribs within the first side beam, these ribs will deform first when the first side beam is impacted by an external force. In this way, the first side beam can absorb a portion of the impact force during deformation, significantly reducing the impact force transmitted to the battery cells and lowering the risk of deformation or even short circuits in the battery cells.

[0022] The battery pack described in this disclosure includes a battery pack composed of multiple battery cells connected in series and / or in parallel to form a battery management system (BMS), a thermal management system, an electrical connection system (high-voltage / low-voltage connectors, wiring harnesses, etc.), structural components (shell, brackets, etc.), and protective components, etc., and the above components are placed in a box and sealed with a cover plate to form a complete functional unit that can directly output electrical energy.

[0023] The aforementioned enclosure refers to a closed or semi-closed structure made of metals such as steel plates or aluminum alloys, or lightweight materials such as plastics, glass fiber reinforced composites, or carbon fiber reinforced composites. It serves as the physical carrier of the battery pack, and its design and manufacturing must meet the safety, reliability, and functionality requirements of the battery pack under different usage scenarios. The enclosure provides installation space for the battery pack, BMS, cooling system, electrical connection components, etc., and through a reasonable structural design, fixes these components within the enclosure, ensuring they maintain a relatively stable position during battery pack operation and preventing damage or loosening of connections due to vibration, impact, or other factors.

[0024] The enclosure typically consists of an upper enclosure and a lower enclosure. The lower enclosure generally has four side panels and a bottom panel. The four side panels can be integrally formed with the bottom panel or formed separately and fixedly connected. The shape of the enclosure can be cylindrical, cuboid, cube, etc.

[0025] The aforementioned battery cell refers to a battery that can store chemical energy and controllably convert it into electrical energy. In recyclable batteries, the active materials can be reactivated by charging after discharge, allowing for continued use. A battery cell typically includes a casing and a battery cell housed within the casing.

[0026] <Example Battery Pack> This disclosure provides a battery pack 100, which includes a housing 10 and a plurality of battery cells 20 arranged within the housing 10. The housing 10 includes a first side beam 11, the length direction of which is parallel to the arrangement direction of the plurality of battery cells 20. The first side beam 11 has a first side wall 111 and a second side wall 112 disposed opposite to each other. The first side wall 111 is located on the outer side of the housing 10, and the second side wall 112 is located on the inner side of the housing 10. A plurality of support ribs are provided between the first side wall 111 and the second side wall 112, with each support rib having its two ends located on the first side wall 111 and the second side wall 112 respectively. At least one of the support ribs has a length greater than the distance between the first side wall 111 and the second side wall 112. The thickness of at least one support rib is d1mm, the thickness of the first side wall 111 is d2mm, and 0.25≤d1mm / d2mm≤0.9.

[0027] For ease of understanding, the battery pack described above will be explained in detail below with reference to the accompanying drawings. In the drawings, the X-axis indicates the length direction of the battery pack 100, which is also the arrangement direction of the multiple battery cells 20, and the length direction of the first side beam 11; the Y-axis indicates the width direction of the battery pack 100; and the Z-axis indicates the height direction of the battery pack 100, which is also the height direction of the first side beam 11.

[0028] First see Figure 1 and Figure 2 The battery pack 100 includes a housing 10 and multiple battery cells 20. The housing 10 generally consists of an upper housing and a lower housing, which are fitted together to form a receiving space in which the multiple battery cells 20 are installed. The housing 10 can be cast from materials such as steel plate or aluminum alloy, or it can be made of 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, or cube.

[0029] For ease of explanation, only the lower housing is shown in the views presented here, and the upper housing is not shown. However, this does not mean that the battery pack disclosed herein does not include an upper housing structure. The following description will use a cuboid shape for housing 10 as an example: As shown in the figure, the box body 10 includes two oppositely arranged first side beams 11 and two oppositely arranged second side beams 12, as well as a base plate 30. The two first side beams 11 and the two second side beams 12 are connected end to end to form the frame of the box body 10. The frame can be integrally formed with the base plate 30 around the periphery, or it can be formed by separate fixed connection.

[0030] See also Figure 3 and Figure 4 The specific structure of the first side beam 11 will be described in detail below: The first side beam 11 includes two opposing first sidewalls 111 and second sidewalls 112. The first sidewalls 111 and second sidewalls 112 can be spaced apart along the width direction of the battery pack 100, thus creating a cavity structure between them, which can be understood as the cavity inside the first side beam 11. This arrangement reduces the weight of the first side beam 11, thereby achieving a lighter battery pack 100.

[0031] The first sidewall 111 is located, for example, on the outside of the housing 10, which can be understood as the surface of the first side beam 11 away from the receiving cavity; the second sidewall 112 is located, for example, on the inside of the housing 10, which can be understood as the surface of the first side beam 11 facing the receiving cavity.

[0032] Multiple support ribs are provided between the first side wall 111 and the second side wall 112. That is, multiple support ribs are provided in the internal cavity of the first side beam 11. The multiple support ribs can improve the strength of the first side beam 11 and ensure the protective function of the first side beam 11 for the battery pack 100.

[0033] Based on this, at least one of the multiple support ribs has a length greater than the distance between the first sidewall 111 and the second sidewall 112. The distance between the first sidewall 111 and the second sidewall 112 can be understood as the size of the interval between them in the width direction of the battery pack 100. When the length of at least one support rib is greater than the distance between the first sidewall 111 and the second sidewall 112, it means that the support rib needs to change its shape or arrangement by means of "tilting", "bending" or "folding" so that the longer support rib can be accommodated between the first sidewall 111 and the second sidewall 112. After the longer support rib is configured as described above, its deformation ability against impact force will be changed. In particular, when the first side beam 11 is subjected to a lateral force impact, the support rib will deform before the first sidewall 111, so that the first sidewall 111 will move towards the second sidewall 112. During this movement, the first side beam 11 will undergo compressive deformation, which can absorb part of the lateral impact force to reduce the force transmitted to the inside through the first side beam 11, effectively reducing the risk of deformation or even short circuit of the battery cell 20 under the action of impact force.

[0034] Meanwhile, at least one support rib has a thickness of d1mm, and the first sidewall 111 has a thickness of d2mm, where 0.25≤d1mm / d2mm≤0.9. The support rib within this thickness range not only ensures that the first side beam 11 is easily deformed when subjected to lateral force impact, allowing it to absorb a portion of the lateral force, but also ensures that the first side beam 11 meets certain strength requirements, providing sufficient support and protection for the battery pack 100.

[0035] The ratio of d1 / d2 can be, for example, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, or 0.9. In practice, the ratio can be determined comprehensively based on factors such as the material, thickness, and strength requirements of the first side beam 11, and is not limited to the ratios listed above.

[0036] Preferably, 1.0mm ≤ d1mm ≤ 3.0mm, and 1.5mm ≤ d2mm ≤ 4mm. The value of d1mm can be, for example, 1.6mm, 1.8mm, 2.0mm, 2.2mm, or 2.4mm, etc. The value of d2mm can be, for example, 2.6mm, 2.8mm, 3.0mm, 3.2mm, 3.5mm, 3.6mm, or 3.8mm, etc. In practice, the values ​​of d1 and d2 can be adjusted adaptively, and are not limited to the values ​​listed above.

[0037] As described above, the length of the support rib can be increased by adjusting its shape. For example, at least one support rib can be arc-shaped, with one end of the arc located on the first sidewall 111 and the other end on the second sidewall 112. This arc can be, for example, a convex arc protruding towards the top of the first sidewall 111 (i.e., an approximately "convex" arc), or a concave arc protruding towards the bottom of the first sidewall 111 (i.e., an approximately "concave" arc), or other irregular arcs. The top of the first sidewall 111 can be understood, for example, as the end pointed to by the positive Z-axis in the height direction of the first sidewall 111, and the bottom of the first sidewall 111 can be understood, for example, as the end pointed to by the negative Z-axis in the height direction of the first sidewall 111. A convex arc can be understood, for example, as an arc segment lying above the line connecting its starting and ending points; a concave arc can be understood, for example, as an arc segment lying below the line connecting its starting and ending points.

[0038] Due to its inherent characteristics, the arc-shaped support rib has greater deflection than the straight support rib perpendicular to the first sidewall 111 (the support rib whose length is equal to the distance between the first sidewall 111 and the second sidewall 112). When the first side beam 11 is impacted by an external force, the arc-shaped support rib is more likely to deform, causing the first sidewall 111 to move closer to the second sidewall 112. That is, the first side beam 11 undergoes compressive deformation, which absorbs part of the impact force, thereby reducing the impact force transmitted to the battery cell 20 and effectively avoiding the risk of deformation or even short circuit of the battery cell 20 under the action of impact force.

[0039] Optionally, the arc-shaped end and the first sidewall 111, and the other end and the second sidewall 112, can be integrally formed, or they can be separate structures connected by welding or other methods. This application does not impose any special limitations on the forming method between the arc-shaped end and the first sidewall 111, or between the other end and the second sidewall 112. In use, the forming method can be adaptively selected based on the materials of the support rib and the first and second sidewalls 111 and 112, as well as the connection strength between the support rib and the first and second sidewalls 111 and 112.

[0040] Similarly, the length of the support rib can be increased by adjusting its shape; at least one support rib can be wavy or serrated. When at least one support rib is wavy, one end of the wavy shape is located on the first sidewall 111, and the other end is located on the second sidewall 112; when at least one support rib is serrated, one end of the serrated shape is located on the first sidewall 111, and the other end is located on the second sidewall 112. The working principle of setting at least one support rib to be wavy or serrated, and the forming relationship between it and the first sidewall 111 and the second sidewall 112, are similar to those when setting at least one support rib to be arc-shaped. Refer directly to the above description of the arc shape; further details are omitted here.

[0041] As described above, the length of the support ribs can also be increased by changing the arrangement of the support ribs within the first side beam 11. For example, at least one support rib can be configured as an inclined plate, with one end of the plate located on the first side wall 111 and the other end located on the second side wall 112.

[0042] It is easy to understand that when at least one support rib is inclined within the first side beam 11, the impact force, especially the lateral force, on the first side beam 11 will be dispersed by the inclined support rib. The dispersed force includes at least a force parallel to the width direction of the battery pack 100 and a force parallel to the height direction of the battery pack 100. In this way, the force parallel to the width direction of the battery pack 100 is reduced, and even if this part of the force is transmitted to the battery cell 20 through the first side beam 11, it is difficult to cause deformation of the battery cell 20.

[0043] Furthermore, the number of at least one support rib is set to multiple, and the shape of the multiple support ribs can be set to one or more of the following: arc-shaped, inclined plate-shaped, wavy, and serrated.

[0044] For example, the number of at least one support rib can be two, three, or four, etc., and the number of support ribs can be determined based on factors such as the height of the first side beam 11. Furthermore, the shapes of these support ribs can be the same or different. For example, if there are at least three support ribs, all three can be curved, or all three can be inclined plates, or all three can be wavy, etc. Similarly, one of the three support ribs can be curved, and the other two can be inclined plates; or one of the three support ribs can be curved, one can be inclined plates, and the remaining one can be serrated, etc. Specific arrangements for multiple support ribs will not be listed individually, as long as each support rib is arranged in a way that facilitates deformation.

[0045] For example, Figure 4As shown, at least one support rib includes a first support rib 114, a second support rib 115, and a third support rib 116. The first support rib 114 is configured as an inclined plate, and the inclination direction of the first support rib 114 is from the end connected to the second side wall 112 to the end connected to the first side wall 111. The second support rib 115 and the third support rib 116 are configured as arcs; in the height direction of the first side beam 11, the first support rib 114 is located between the second support rib 115 and the third support rib 116.

[0046] The second support rib 115 and the third support rib 116 can be configured as either an upwardly convex or downwardly concave arc shape. When the first side beam 11 is impacted by a lateral force, this lateral force is transmitted inward along the width direction parallel to the battery pack 100 under the action of the second support rib 115 and the third support rib 116, causing the first side beam 11 to undergo compressive deformation. Simultaneously, the first support rib 114 is inclined from the first side wall 111 towards the second side wall 112, so that when the first side beam 11 is impacted by a lateral force, this lateral force is transmitted downwards along the direction of the first support rib 114 towards the bottom of the battery pack 100. Ultimately, this force is transmitted to the lower region near the battery cell 20. Because the lower region of the battery cell 20 has better strength and support, it can better resist deformation, further reducing the risk of deformation of the battery cell 20.

[0047] Preferably, the first support rib 114, the second support rib 115, and the third support rib 116 are evenly distributed along the height direction of the first side beam 11. When the first side beam 11 is impacted by an external force, the force is evenly distributed across the first support rib 114, the second support rib 115, and the third support rib 116. Furthermore, the first support rib 114, the second support rib 115, and the third support rib 116 can transmit the impact force inward in a relatively dispersed manner, preventing the force transmitted inward from being excessively concentrated in a certain area of ​​the battery cell 20, which could cause deformation of that area of ​​the battery cell 20 due to excessive stress.

[0048] In one alternative embodiment, the compressive strength of at least one support rib is less than the compressive strength of the first sidewall 111. Continuing... Figure 4 For example, at least one support rib includes a first support rib 114, a second support rib 115, and a third support rib 116. The compressive strength of the first support rib 114 can be less than the compressive strength of the first sidewall 111, or the compressive strength of the second support rib 115 can be less than the compressive strength of the first sidewall 111, or the compressive strength of the third support rib 116 can be less than the compressive strength of the first sidewall 111. Alternatively, the compressive strength of any two or any three of the first support ribs 114, second support ribs 115, and third support ribs 116 can be less than the compressive strength of the first sidewall 111.

[0049] By setting the compressive strength as described above, when the first side beam 11 is impacted, it can be further ensured that the first support rib 114, and / or, the second support rib 115, and / or, the third support rib 116 deforms preferentially over the first side wall 111. When the first support rib 114, and / or, the second support rib 115, and / or, the third support rib 116 deforms, the first side wall 111 will move towards the second side wall 112. In other words, the above arrangement can further ensure that the first side beam 11 undergoes compressive deformation when impacted by a lateral force. This deformation absorbs a portion of the lateral force, reducing the force transmitted to the battery cell 20 and further reducing the risk of deformation of the battery cell 20.

[0050] By way of example only, when the material of at least one support rib is the same as that of the first sidewall 111, the thickness of at least one support rib can be less than the thickness of the first sidewall 111, so that the compressive strength of at least one support rib is less than the compressive strength of the first sidewall 111.

[0051] See also Figure 5 The first support rib 114, the second support rib 115, and the third support rib 116 are made of the same material as the first sidewall 111. The thickness d1 of the first support rib 114 can be less than the thickness d2 of the first sidewall 111, and / or, the thickness d1 of the second support rib 115 can be less than the thickness d2 of the first sidewall 111, and / or, the thickness d1 of the third support rib 116 can be less than the thickness d2 of the first sidewall 111. This arrangement ensures that the compressive strength of the first support rib 114, and / or, the second support rib 115, and / or the third support rib 116 is less than the compressive strength of the first sidewall 111. The thicknesses of the first support rib 114, the second support rib 115, and the third support rib 116 can be the same or different.

[0052] Of course, different methods can be used to make the compressive strength of the first support rib 114, the second support rib 115, and the third support rib 116 less than the compressive strength of the first sidewall 111. For example, the above objective can be achieved by using different materials for the first support rib 114, the second support rib 115, and the third support rib 116 and the first sidewall 111. This application does not impose any special limitation on the implementation method, as long as it enables the compressive strength of the first support rib 114, the second support rib 115, and the third support rib 116 to be less than the compressive strength of the first sidewall 111.

[0053] Still with Figure 4For example, the first support rib 114, the second support rib 115 and the third support rib 116 are all provided with a reinforcing part T, and the reinforcing parts T of the first support rib 114, the second support rib 115 and the third support rib 116 are all located between their respective ends and the first side wall 111 and the second side wall 112.

[0054] In other words, the first support rib 114 is provided with two reinforcing parts T. One reinforcing part T is located between one end of the first support rib 114 and the first side wall 111, and the other reinforcing part T is located between the other end of the first support rib 114 and the second side wall 112. This arrangement overcomes stress concentration at the junctions of the first support rib 114 and the first side wall 111, and at the junctions of the first support rib 114 and the second side wall 112, thereby improving the strength between the first support rib 114 and the first side wall 111, and the second side wall 112. When the first side beam 11 is subjected to a lateral force and undergoes deformation, it ensures that during deformation, there will be no breakage between the first support rib 114 and the first side wall 111, and / or between the first support rib 114 and the second side wall 112. Therefore, the first side beam 11 can continuously absorb lateral forces through deformation, preventing most of the lateral forces from being transferred to the battery cell 20 due to breakage.

[0055] Similarly, the reinforcing portions T of the second support rib 115 and the third support rib 116 are also configured in the same way and have the same working principle. Refer to the above description of the reinforcing portion T of the first support rib 114; it will not be repeated here.

[0056] Optionally, the thickness of the reinforcing part T is greater than the thickness of the other parts of the first support rib 114, the second support rib 115, and the third support rib 116. This improves the strength between the first support rib 114 and the first sidewall 111 and the second sidewall 112, the strength between the second support rib 115 and the first sidewall 111 and the second sidewall 112, and the strength between the third support rib 116 and the first sidewall 111 and the second sidewall 112. This ensures that during the deformation of the first side beam 11, the junctions of the first support rib 114, the second support rib 115, and the third support rib 116 with the first sidewall 111 and / or the second sidewall 112 will not fracture.

[0057] See also Figure 4As an optional implementation, the first side beam 11 further includes a protrusion 113 and a fourth support rib 117. The protrusion 113 is located between the plurality of battery cells 20 and the second side wall 112 and protrudes toward the plurality of battery cells 20. The protrusion 113 can reduce the movement space of the plurality of battery cells 20 within the housing 10, that is, the protrusion 113 can at least restrict the movement space of the plurality of battery cells 20 in the width direction of the battery pack 100. This prevents the plurality of battery cells 20 from shaking violently under external forces, improving the safety performance of the battery pack during use. In addition, a cushioning material such as foam can be filled between the protrusion 113 and the battery cells 20 to better limit the movement of the battery cells 20.

[0058] like Figure 4 As shown, the bottom surface of the protrusion 113 is connected to the edge of the base plate 30. It is understood that the base plate 30 has an edge region and a central region surrounded by the edge region, in which a recessed structure protrudes in a direction away from the battery cell 20. This recessed structure provides a buffer space between the base plate 30 and the multiple battery cells 20. When the base plate 30 is impacted by an external force, the buffer space allows the base plate 30 to deform to a certain extent, preventing the deformed portion of the base plate 30 from impacting the battery cells 20, thus protecting the battery cells 20. By not providing this recessed structure in the edge region of the base plate 30, the edge region can be closer to the bottom surface of the protrusion 113, facilitating the connection between the two. In the height direction of the first side beam 11, the bottom surface of the protrusion 113 is higher than the bottom surface of the second side wall 112, creating a clearance space for the connection between the protrusion 113 and the base plate 30, facilitating operation.

[0059] As described above, no recessed structure is provided in the edge area of ​​the base plate 30. Due to the presence of a recessed structure in the central area, the area below the edge of the base plate 30 is in a suspended state. The fourth support rib 117 is plate-shaped, with its two ends located on the first sidewall 111 and the second sidewall 112 respectively, and perpendicular to both sides. This improves the strength of the fourth support rib 117, giving it better resistance to deformation. When the first side beam 11 is impacted, the strength of the fourth support rib 117 can compensate for the corresponding suspended area below the edge of the base plate 30, ensuring that this area is not affected by the impact.

[0060] Meanwhile, in the height direction of the first side beam 11, the fourth support rib 117 is positioned on the second side wall 112 between the bottom surface of the protrusion 113 and the bottom surface of the second side wall 112. Thus, the fourth support rib 117 is positioned precisely to correspond to the suspended area below the edge region of the base plate 30, ensuring that the fourth support rib 117 can protect the corresponding suspended area below the edge region of the base plate 30.

[0061] like Figure 5 As shown, in the height direction of the first side beam 11, the distance between the bottom surface of the protrusion 113 and the bottom surface of the second side wall 112 is h1 mm, and the height of the second side wall 112 is h2 mm, where 0.1 ≤ h1 mm / h2 mm ≤ 0.35. For example, h1 mm / h2 mm can be 0.1, 0.15, 0.2, 0.25, 0.3, or 0.35, etc. Meeting the above ranges for h1 mm and h2 mm provides sufficient clearance for the connection between the protrusion 113 and the base plate 30 to facilitate operation; on the other hand, it avoids making the clearance space too large, thus preventing adverse effects on the energy density of the battery pack 100.

[0062] Wherein, 10mm ≤ h1mm ≤ 30mm, and 80mm ≤ h2mm ≤ 120mm. The value of h1mm can be, for example, 15mm, 18mm, 20mm, 25mm, or 28mm, etc. The value of h2mm can be, for example, 85mm, 90mm, 95mm, 100mm, or 110mm, etc. In use, the values ​​of h1mm and h2mm can be adjusted adaptively according to the strength requirements of the first side beam 11, and are not limited to the values ​​listed above.

[0063] <Example Electrical Equipment> This disclosure also provides an electrical device that includes the battery pack described above. This electrical device can be, for example, a vehicle, a ship, an aircraft, a household appliance, industrial equipment, or an energy storage device. The vehicle can be, for example, a passenger car, a truck, or a construction vehicle.

[0064] It should be noted that the elements described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0065] It should be understood that multiple components and / or parts can be provided by a single integrated component or part. Alternatively, a single integrated component or part can be divided into multiple separate components and / or parts. The use of the public designation "a" or "an" to describe a component or part is not intended to exclude other components or parts.

[0066] It should be understood that although terms such as “first” or “second” may be used in this disclosure to describe various elements (such as first… and second…), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0067] The basic principles of this disclosure have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this disclosure are merely examples and not limitations, and should not be considered as essential features of each embodiment of this disclosure. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the scope of this disclosure to the necessity of employing the aforementioned specific details for implementation.

[0068] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A battery pack, characterized in that, It includes a housing (10) and multiple battery cells (20), the multiple battery cells (20) are arranged inside the housing (10), the housing (10) includes a first side beam (11), the length direction of the first side beam (11) is parallel to the arrangement direction of the multiple battery cells (20); The first side beam (11) has a first side wall (111) and a second side wall (112) arranged opposite to each other. The first side wall (111) is located on the outside of the box (10), and the second side wall (112) is located on the inside of the box (10). A plurality of support ribs are provided between the first sidewall (111) and the second sidewall (112), with the two ends of each support rib located on the first sidewall (111) and the second sidewall (112) respectively. At least one of the plurality of support ribs has a length greater than the distance between the first sidewall (111) and the second sidewall (112). The thickness of the at least one support rib is d1mm, and the thickness of the first sidewall (111) is d2mm, 0.25≤d1mm / d2mm≤0.

9.

2. The battery pack as described in claim 1, characterized in that, 1.0mm≤d1mm≤3.0mm.

3. The battery pack as described in claim 1, characterized in that, 1.5mm≤d2mm≤4mm.

4. The battery pack as described in claim 1, characterized in that, The at least one support rib is configured as an arc shape, with one end of the arc shape located on the first side wall (111) and the other end of the arc shape located on the second side wall (112); the arc shape is a convex arc protruding toward the top of the first side wall (111), or the arc shape is a concave arc protruding toward the bottom of the first side wall (111).

5. The battery pack as described in claim 1, characterized in that, The at least one support rib is configured as an inclined plate, with one end of the plate located on the first sidewall (111) and the other end of the plate located on the second sidewall (112).

6. The battery pack as described in claim 1, characterized in that, The at least one support rib is configured to be wavy, with one end of the wavy shape located on the first sidewall (111) and the other end of the wavy shape located on the second sidewall (112).

7. The battery pack as described in claim 1, characterized in that, The at least one support rib is configured to be serrated, with one end of the serration located on the first sidewall (111) and the other end of the serration located on the second sidewall (112).

8. The battery pack as claimed in claim 1, characterized in that, The at least one support rib is provided as a plurality of ribs, and the shape of the plurality of support ribs is provided as one or more of the following: arc-shaped, inclined plate-shaped, wavy, and sawtooth-shaped.

9. The battery pack as claimed in claim 1, characterized in that, The at least one support rib includes a first support rib (114), a second support rib (115), and a third support rib (116). The first support rib (114) is configured as an inclined plate, and the second support rib (115) and the third support rib (116) are configured as arcs. In the height direction of the first side beam (11), the first support rib (114) is located between the second support rib (115) and the third support rib (116).

10. The battery pack as claimed in claim 9, characterized in that, The first support rib (114) is inclined from one end located on the first side wall (111) to one end located on the second side wall (112).

11. The battery pack as claimed in claim 9, characterized in that, The first support rib (114), the second support rib (115) and the third support rib (116) are evenly distributed along the height direction of the first side beam (11).

12. The battery pack as claimed in claim 1, characterized in that, The compressive strength of the at least one support rib is less than the compressive strength of the first sidewall (111).

13. The battery pack as claimed in claim 12, characterized in that, The material of the at least one support rib is the same as that of the first sidewall (111), and the thickness of the at least one support rib is less than the thickness of the first sidewall (111).

14. The battery pack as claimed in claim 12, characterized in that, The at least one support rib is provided with a reinforcing part (T), which is located between the end of the at least one support rib and the first sidewall (111) and the second sidewall (112).

15. The battery pack as claimed in claim 14, characterized in that, The thickness of the reinforcing part (T) is greater than the thickness of the other parts of the at least one supporting rib.

16. The battery pack as claimed in claim 9, characterized in that, The first side beam (11) further includes a protrusion (113) and a fourth support rib (117). The protrusion (113) is located between the plurality of battery cells (20) and the second side wall (112) and protrudes toward the plurality of battery cells (20). In the height direction of the first side beam (11), the bottom surface of the protrusion (113) is higher than the bottom surface of the second side wall (112). The fourth support rib (117) is plate-shaped, with its two ends located on the first side wall (111) and the second side wall (112) respectively, and perpendicular to the first side wall (111) and the second side wall (112); In the height direction of the first side beam (11), the end of the fourth support rib (117) is located on the second side wall (112) between the bottom surface of the protrusion (113) and the bottom surface of the second side wall (112).

17. The battery pack as claimed in claim 16, characterized in that, In the height direction of the first side beam (11), the distance between the bottom surface of the protrusion (113) and the bottom surface of the second side wall (112) is h1 mm, the height of the second side wall (112) is h2 mm, and 0.1≤h1mm / h2mm≤0.

35.

18. The battery pack as claimed in claim 17, characterized in that, 10mm≤h1mm≤30mm.

19. The battery pack as claimed in claim 17, characterized in that, 80mm≤h2 mm≤120mm.

20. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-19.

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