Battery pack and electric device with same
By controlling the contact area ratio between the battery module base plate and the housing base plate, a rigid whole is formed to withstand impact forces, solving the problems of heavy battery pack weight and low energy density, and achieving lightweighting and improved reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CALB GROUP CO LTD
- Filing Date
- 2025-06-13
- Publication Date
- 2026-07-28
AI Technical Summary
Battery packs are heavy and have low energy density. In order to improve impact resistance, existing technologies require the addition of a bottom protection plate, which increases weight and reduces energy density.
By contacting and fixing the first part of the battery module base plate to the box base plate, and controlling its area ratio S1/S2 within the range of 0.17≤S1/S2≤0.9, a rigid whole is formed to withstand the impact force, and the bottom protective plate is omitted.
While reducing the weight of the battery pack, the energy density is increased, and the reliability and shock resistance of the battery pack are ensured by controlling the connection strength.
Smart Images
Figure CN224570207U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of batteries, and in particular to a battery pack and an electrical device having the battery pack. Background Technology
[0002] Battery packs are used to store and output electrical energy, and are widely used in various devices such as electric vehicles and energy storage equipment. Some battery packs include a housing and battery modules. The battery modules include a module base plate, and the bottom of the housing includes a housing base plate and a bottom protective plate. The battery modules are mounted on the housing base plate. The bottom protective plate is located under the housing base plate to withstand external impacts. However, this type of battery pack has the problems of heavy weight and low energy density. Utility Model Content
[0003] In view of this, the present disclosure provides a battery pack and an electrical device having the same, which aims to at least improve the problems of heavy weight and low energy density of the battery pack.
[0004] On one hand, this disclosure provides a battery pack. The battery pack includes a housing and battery modules. The housing includes a housing base plate. The battery modules are housed within the housing and include a battery pack and a module base plate. The battery pack is supported on the module base plate. The module base plate is supported on the housing base plate. The module base plate includes a first portion and a second portion. The first portion is in contact with and fixedly connected to the housing base plate, and the second portion is spaced apart from the housing base plate. The area of the first portion is S1, and the area of the module base plate is S2, and the ratio S1 / S2 satisfies: 0.17 ≤ S1 / S2 ≤ 0.9.
[0005] On the other hand, this disclosure also provides an electrical device that includes the aforementioned battery pack.
[0006] According to the battery pack and electrical equipment provided in this disclosure, by contacting and fixing the base plate of the enclosure and the base plate of the module, the two become a rigid whole. Upon impact, the base plate of the enclosure and the base plate of the module can collectively bear the impact force as a whole, thus ensuring sufficient impact resistance of the battery pack even without a bottom protective plate, thereby reducing the weight of the battery pack and increasing its energy density. Furthermore, by controlling the range of the ratio S1 / S2, sufficient connection strength between the base plate of the enclosure and the base plate of the module is ensured to guarantee the reliability of the base plate's support for the battery module, while also reducing the risk of impact being directly transmitted to the battery pack, thereby ensuring the reliability of the battery pack. Attached Figure Description
[0007] It should be understood that the following figures only show some embodiments of the present invention and should not be regarded as a limitation on the scope.
[0008] It should be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.
[0009] 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.
[0010] Figure 1 This is a schematic diagram of the structure of a battery pack according to an embodiment of the present disclosure.
[0011] Figure 2 To conceal the top panel of the enclosure Figure 1 A schematic diagram of the battery pack structure.
[0012] Figure 3 for Figure 1 A schematic diagram showing the exploded structure of some elements of the battery pack.
[0013] Figure 4 For along Figure 2 A schematic partial sectional view taken by line AA in the diagram.
[0014] Figure 5 This is a schematic partial cross-sectional view of a battery pack according to another embodiment of the present disclosure.
[0015] Figure 6 This is a schematic partial cross-sectional view of a battery pack according to another embodiment of the present disclosure.
[0016] Figure 7 This is a schematic partial cross-sectional view of a battery pack according to another embodiment of the present disclosure.
[0017] Figure 8 This is a schematic partial cross-sectional view of a battery pack according to another embodiment of the present disclosure.
[0018] Figure 9 This is a schematic diagram of the structure of an electrical device according to an embodiment of the present disclosure.
[0019] Explanation of reference numerals in the attached drawings: 100, battery pack; 10, housing; 11, housing base plate; 111, support part; 112, plate part; 11a, base layer; 11b, buffer layer; 113, connecting part; 12, beam; 121, beam body; 122, extension part; 20, battery module; 21, battery pack; 211, cylindrical battery; 212, prismatic battery; 22, module base plate; 221, first part; 222, second part; 200, electrical equipment. Detailed Implementation
[0020] 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.
[0021] Battery packs with a bottom protective plate often suffer from heavy weight and low energy density.
[0022] The inventors discovered that the above problems arise because an additional bottom protective plate is needed under the bottom plate of the casing to improve the battery pack's impact resistance, thus increasing the battery pack's weight and volume, resulting in a heavy battery pack and low energy density. Without the bottom protective plate, when the casing bottom plate is impacted, the impact is directly transmitted to the battery pack, causing damage. If the module bottom plate is completely separated from the casing bottom plate to prevent direct impact transmission to the battery pack, the battery module loses the support provided by the casing bottom plate, making it equally susceptible to damage when the casing bottom plate is impacted.
[0023] To address the aforementioned problems, the inventors made numerous attempts and ultimately creatively proposed the following technical solution: The first part of the battery module base plate contacts and is fixedly connected to the casing base plate, while the second part of the battery module base plate is spaced apart from the casing base plate. The ratio S1 / S2 of the area S1 of the first part to the total area S2 of the battery module base plate satisfies: 0.17 ≤ S1 / S2 ≤ 0.9. By contacting and fixing the casing base plate and the module base plate together, they become a rigid whole. Upon impact, the casing base plate and the module base plate can collectively bear the impact force, thus ensuring sufficient impact resistance for the battery pack even without a bottom protective plate, thereby reducing the battery pack's weight and increasing its energy density. Furthermore, by controlling the range of the ratio S1 / S2, sufficient connection strength between the casing base plate and the module base plate is ensured to guarantee the reliability of the casing base plate's support for the battery module, while also reducing the risk of direct impact transmission to the battery pack, thus ensuring the reliability of the battery pack.
[0024] <Example Battery Pack>
[0025] This disclosure provides a battery pack 100. For ease of understanding, the overall structure of the battery pack 100 according to this disclosure will be described below by way of example. It should be understood that the structure of the battery pack 100 is not limited to the following description. For example, one or more elements introduced below may be omitted or replaced, and their layout relationships may be changed.
[0026] refer to Figures 1 to 3The battery pack 100 may include a housing 10 and a battery module 20.
[0027] The housing 10 includes a base plate 11. The battery module 20 is housed within the housing 10 and supported on the base plate 11. The housing 10 can house one battery module 20 or multiple battery modules 20. Furthermore, the housing 10 may also include a top plate or the like to protect the battery modules.
[0028] Battery module 20 may include battery pack 21. Battery pack 21 may include at least one battery. A battery is an energy storage unit capable of repeated charging and discharging, and can be interpreted as a "secondary battery." In this disclosure, the concept of "secondary battery" may include, but is not limited to, lithium-ion secondary batteries, sodium-ion secondary batteries, lead-acid batteries, and nickel-metal hydride batteries, etc. The multiple batteries in battery pack 21 may be cylindrical batteries, prismatic batteries, etc., or combinations thereof.
[0029] The battery module 20 also includes a module base plate 22. The battery pack 21 can be placed on the module base plate 22. The housing base plate 11 supports the battery module 20 by supporting the module base plate 22. The module base plate 22 includes a first part 221 and a second part 222. The first part 221 is in contact with and fixedly connected to the housing base plate 11, and the second part 222 is spaced apart from the housing base plate 11. The area of the first part 221 is S1, and the area of the second part 222 is S2.
[0030] It should be noted that the first part 221 and the second part 222 may include a continuous section or multiple sections spaced apart from each other. That is, the positions where the module base plate 22 contacts and is fixedly connected to the housing base plate 11 can be concentrated in one area or distributed across multiple areas. Similarly, the intervals between the module base plate 22 and the housing base plate 11 can be concentrated in one area or distributed across multiple areas. Therefore, the first part 221 and the second part 222 of the module base plate 22 are not limited to... Figure 3 The structure shown can be customized according to actual needs.
[0031] It should be noted that the first part 221 and the second part 222 are not limited to the parts that include the same module base plate 22. When multiple module base plates 22 are supported on the box base plate 11, the first part 221 and the second part 222 may include parts of different module base plates 22 among the multiple module base plates 22.
[0032] When the first part 221 and the second part 222 consist of a continuous segment, the area S1 of the first part 221 and the area S2 of the second part 222 are the areas of that continuous segment. When the first part 221 and the second part 222 consist of multiple segments spaced apart from each other, the area S1 of the first part 221 and the area S2 of the second part 222 are the sum of the areas of each of the multiple segments spaced apart from each other.
[0033] The ratio S1 / S2 can satisfy: 0.17 ≤ S1 / S2 ≤ 0.9. Preferably, the ratio S1 / S2 can satisfy: 0.33 ≤ S1 / S2 ≤ 0.82. More preferably, the ratio S1 / S2 can satisfy: 0.51 ≤ S1 / S2 ≤ 0.64. Alternatively, the ratio S1 / S2 can also be 0.27, 0.38, 0.48, 0.59, 0.69, or 0.8, etc.
[0034] By contacting and fixing the base plate 11 of the housing and the base plate 22 of the module together, they become a rigid whole. Upon impact, the base plate 11 and the base plate 22 can collectively bear the impact force as a single unit, thus ensuring sufficient impact resistance for the battery pack 100 even without a bottom protective plate, thereby reducing the weight of the battery pack 100 and increasing its energy density. Furthermore, by controlling the range of the ratio S1 / S2, sufficient connection strength between the base plate 11 and the base plate 22 is ensured to guarantee the reliability of the base plate 11 in supporting the battery module 21, while also reducing the risk of impact being directly transmitted to the battery pack 21, thereby ensuring the reliability of the battery pack 100.
[0035] In some embodiments, reference Figure 4 The box base plate 11 includes a plate portion 112 and a support portion 111. The plate portion 112 is spaced apart from the module base plate 22. The support portion 111 protrudes from the plate portion 112 toward the module base plate 22 and contacts and is fixedly connected to the first portion 221. That is, the plate portion 112 of the box base plate 11 corresponds to the second portion 222 of the module base plate 22, and the support portion 111 of the box base plate 11 corresponds to the first portion 221 of the box base plate 11. Since the support portion 111 protrudes from the plate portion 112 toward the module base plate 22, the surface of the box base plate 11 facing the module base plate 22 forms an alternating concave-convex structure.
[0036] In some embodiments, reference Figure 4The support portion 111 is a reinforcing rib formed by the deformation of the bottom plate 11 of the housing body towards the bottom plate 22. The bottom plate 11 can be processed by stamping or other methods to deform and bulge towards the bottom plate 22 to form the reinforcing rib, thus forming the support portion 111. During the formation of the support portion 111, only the bottom plate 11 needs to be deformed to form the reinforcing rib without adding additional material; therefore, the weight of the bottom plate 11 does not increase due to the formation of the support portion 111. However, if the support portion 111 is subjected to an impact force, since the support portion 111 is in contact with and fixedly connected to the first part 221 of the bottom plate 22, the impact force will be directly transmitted to the first part 221 of the bottom plate 22 through the support portion 111, thereby damaging the battery module 20. Therefore, in this embodiment, the area of the first part 221 should be smaller, that is, the ratio S1 / S2 should satisfy: 0.17≤S1 / S2≤0.76. Preferably, the ratio S1 / S2 can satisfy: 0.27≤S1 / S2≤0.65. More preferably, the ratio S1 / S2 can satisfy: 0.4≤S1 / S2≤0.53. Optionally, the ratio S1 / S2 can also be 0.25, 0.34, 0.42, 0.51, 0.59, or 0.68, etc. This can avoid excessive direct contact area between the module base plate 22 and the support portion 111 of the box base plate 11, thereby reducing the risk of damage to the battery module 20 when the box base plate 11 is subjected to impact.
[0037] In some embodiments, reference Figure 5 The support portion 111 is a protrusion formed by extending the base plate 11 of the housing from the plate portion 112 toward the module base plate 22. During its formation, the support portion 111 requires extending the base plate 11 from the plate portion toward the module base plate 22 to form the protrusion, and its thickness is greater than that of the plate portion 112. When the support portion 111 is subjected to impact, due to its greater thickness, even if the support portion 111 is in contact with and fixedly connected to the first part 221 of the base plate 11, it can absorb a certain amount of impact force, thus playing a buffering role. In this case, the area of the first part 221 can be larger, i.e., the ratio S1 / S2 satisfies: 0.34 ≤ S1 / S2 ≤ 0.9. Preferably, the ratio S1 / S2 can satisfy: 0.46 ≤ S1 / S2 ≤ 0.78. More preferably, the ratio S1 / S2 can satisfy: 0.55 ≤ S1 / S2 ≤ 0.7. Optionally, the ratio S1 / S2 can also be 0.42, 0.5, 0.58, 0.66, 0.74, or 0.82, etc. This can increase the area of direct contact between the module base plate 22 and the support portion 111 of the box base plate 11, thereby improving the buffering effect of the box base plate 11 on the module base plate 22.
[0038] In other embodiments, the first portion 221 of the module base plate 22 may protrude from the second portion 222 toward the housing base plate 11, thereby forming an alternating concave-convex structure on the surface of the module base plate 22 toward the housing base plate 11. Alternatively, both opposing surfaces of the module base plate 22 and the housing base plate 11 may form an alternating concave-convex structure. That is, it is sufficient that at least one of the opposing surfaces of the module base plate 22 and the housing base plate 11 has an alternating concave-convex structure.
[0039] In some embodiments, the base plate 11 of the enclosure is welded to the first portion 221. Since the strength of the welded connection depends on the number of weld points or the length of the weld, the area of the first portion 221 should be relatively large, i.e., the ratio S1 / S2 should satisfy: 0.51 ≤ S1 / S2 ≤ 0.9. Preferably, the ratio S1 / S2 can satisfy: 0.6 ≤ S1 / S2 ≤ 0.81. More preferably, the ratio S1 / S2 can satisfy: 0.66 ≤ S1 / S2 ≤ 0.75. Optionally, the ratio S1 / S2 can also be 0.57, 0.62, 0.68, 0.73, 0.79, or 0.84, etc. Accordingly, it can be ensured that the base plate 11 of the enclosure and the first portion 221 have sufficient area to accommodate weld points or welds, thereby ensuring sufficient connection strength between the base plate 11 of the enclosure and the first portion 221.
[0040] In some embodiments, reference Figure 6 and Figure 7 The battery pack 21 includes multiple cylindrical batteries 211. Because the cylindrical batteries 211 are cylindrical, even when multiple cylindrical batteries 211 are closely arranged, there will still be gaps between the areas of each cylindrical battery 211 that contact the module base plate 22. When an area of the module base plate 22 that is not in contact with the cylindrical batteries 211 is impacted, the gaps can act as a buffer. In this case, the area of the first part 221 can be larger, that is, the ratio S1 / S2 satisfies: 0.25 ≤ S1 / S2 ≤ 0.9. Preferably, the ratio S1 / S2 can satisfy: 0.39 ≤ S1 / S2 ≤ 0.75. More preferably, the ratio S1 / S2 can satisfy: 0.51 ≤ S1 / S2 ≤ 0.66. Optionally, the ratio S1 / S2 can also be 0.34, 0.44, 0.53, 0.62, 0.71, or 0.81, etc. This ensures sufficient connection strength between the base plate 11 and the module base plate 22 to guarantee the reliability of the base plate 11 in supporting the battery module 20, while also reducing the risk of impact being directly transmitted to the battery pack 21, thereby ensuring the reliability of the battery pack 100.
[0041] In some embodiments, reference Figure 6Multiple cylindrical batteries 211 are arranged axially parallel to the bottom plate 11 in the housing 10. Since the multiple cylindrical batteries 211 are arranged parallel to the bottom plate 11 in the housing 10, the contact area between each cylindrical battery 211 and the module bottom plate 22 is only a line. Even if the multiple cylindrical batteries 211 are closely arranged, there will still be a large gap between them and the module bottom plate 22. In this case, the area of the first part 221 can be larger, that is, the ratio S1 / S2 satisfies: 0.58≤S1 / S2≤0.9. Preferably, the ratio S1 / S2 can satisfy: 0.65≤S1 / S2≤0.83. More preferably, the ratio S1 / S2 can satisfy: 0.74≤S1 / S2≤0.79. Optionally, the ratio S1 / S2 can also be 0.63, 0.67, 0.72, 0.76, 0.81, or 0.85, etc. This ensures sufficient connection strength between the casing base plate 11 and the module base plate 22 to guarantee the reliability of the casing base plate 11 in supporting the battery module 20, while also reducing the risk of impacts being directly transmitted to the battery pack 21, thereby ensuring the reliability of the battery pack 100.
[0042] In some embodiments, reference Figure 7 Multiple cylindrical batteries 211 are arranged axially perpendicular to the bottom plate 11 in the housing 10. When the multiple cylindrical batteries 211 are arranged axially perpendicular to the bottom plate 11 in the housing 10, one of the two end faces of the multiple cylindrical batteries 211 that are opposite each other in the axial direction will contact the module bottom plate 22. Under the condition that the multiple cylindrical batteries 211 are also closely arranged, the contact area between the multiple cylindrical batteries 211 and the module bottom plate 22 will be larger than when they are arranged axially parallel to the bottom plate 11 in the housing 10. Therefore, the gap between them and the module bottom plate 22 will be smaller, and the buffering effect will be smaller. At this time, the area of the first part 221 should be smaller, that is, the ratio S1 / S2 satisfies: 0.25≤S1 / S2≤0.79. Preferably, the ratio S1 / S2 can satisfy: 0.35≤S1 / S2≤0.66. More preferably, the ratio S1 / S2 can satisfy: 0.43 ≤ S1 / S2 ≤ 0.58. Optionally, the ratio S1 / S2 can also be 0.33, 0.4, 0.48, 0.56, 0.64, or 0.71, etc. Accordingly, sufficient connection strength is ensured between the base plate 11 of the casing and the base plate 22 to ensure the reliability of the base plate 11 in supporting the battery module 20, while reducing the risk of impact being directly transmitted to the battery pack 21, thereby ensuring the reliability of the battery pack 100.
[0043] In some embodiments, reference Figure 8The battery pack 21 includes multiple prismatic cells 212. If the multiple prismatic cells 212 are arranged closely together, there will be no gap between the areas of each prismatic cell 212 that contact the module base plate 22 to provide a buffering effect. In this case, the area of the first part 221 should be smaller, that is, the ratio S1 / S2 should satisfy: 0.17≤S1 / S2≤0.3. Preferably, the ratio S1 / S2 can satisfy: 0.2≤S1 / S2≤0.27. More preferably, the ratio S1 / S2 can satisfy: 0.22≤S1 / S2≤0.25. Optionally, the ratio S1 / S2 can also be 0.19, 0.21, 0.23, 0.24, 0.26, or 0.28, etc. This ensures sufficient connection strength between the base plate 11 and the module base plate 22 to guarantee the reliability of the base plate 11 in supporting the battery module 20, while also reducing the risk of impact being directly transmitted to the battery pack 21, thereby ensuring the reliability of the battery pack 100.
[0044] In some embodiments, reference Figure 4 The bottom plate 11 of the enclosure includes a base layer 11a and a buffer layer 11b located on the bottom side of the base layer 11a. The buffer layer 11b defines the bottom surface of the bottom plate 11, meaning that the buffer layer 11b is the first to be subjected to impact force. The buffer layer 11b can have less stiffness than the base layer 11a, thereby absorbing a portion of the impact force when the bottom plate 11 is subjected to impact force, further reducing the risk of damage to the battery pack 21.
[0045] Since the buffer layer 11b can act as a buffer, in some embodiments, the area of the first portion 221 is allowed to be larger, that is, the ratio S1 / S2 satisfies: 0.76≤S1 / S2≤0.9. Preferably, the ratio S1 / S2 can satisfy: 0.79≤S1 / S2≤0.87. More preferably, the ratio S1 / S2 can satisfy: 0.81≤S1 / S2≤0.85. Alternatively, the ratio S1 / S2 can also be 0.78, 0.8, 0.82, 0.84, 0.86, or 0.88. Accordingly, sufficient connection strength is ensured between the box base plate 11 and the module base plate 22 to ensure the reliability of the box base plate 11 in supporting the battery module 20, and the risk of impact being directly transmitted to the battery pack 21 is reduced, thereby ensuring the reliability of the battery pack 100.
[0046] In some embodiments, the base layer 11a may be made of metal, such as steel and aluminum alloy or a hybrid thereof. The buffer layer 11b may be made of a polymer, such as PVC, PP, PU and resin or a hybrid thereof.
[0047] In some embodiments, the box 10 further includes a beam 12. (See reference) Figure 4The beam 12 may include a beam body 121. The battery module 20 may be located on one side of the beam body 121 in the transverse direction (X direction shown in the figure), and such a beam 12 may be referred to as a side beam. The beam 12 can provide lateral support for the battery module 20. The beam 12 may also include an extension 122 extending from the beam body 121 toward the side where the battery module 20 is located. The module base plate 22, the housing base plate 11, and the extension 122 are stacked and fixedly connected to form a three-layer structure to provide better protection for the edge area of the battery module 20 near the beam 12.
[0048] In some embodiments, reference Figure 4 The extension 122 is located between the module base plate 22 and the box base plate 11, thereby making the surface of the module base plate 22 flat to facilitate the placement of the battery pack 21.
[0049] refer to Figure 3 The extension 122 has a lateral dimension of W1, and the module base plate 22 has a lateral dimension of W2. If W1 is too small compared to W2, the connection area between the extension 122 and the module base plate 22 will be too small, resulting in insufficient connection strength between the extension 122 and the module base plate 22. If the connection strength between the extension 122 and the module base plate 22 is insufficient, the extension 122 may separate from the module base plate 22 when the battery base plate is impacted, thus losing its protection and support function for the battery module 20. If W1 is too large compared to W2, the three-layer structure formed by the module base plate 22, the housing base plate 11, and the extension 122 will occupy too large an area in the module base plate 22. Since the buffering effect of this three-layer structure is not as good as the buffering effect of the gap between the second part 222 of the module base plate 22 and the housing base plate 11, the excessive area of this three-layer structure will reduce the impact resistance of the battery pack 100. Therefore, in some embodiments, the ratio W1 / W2 satisfies: 0.06 ≤ W1 / W2 ≤ 0.2. Preferably, the ratio W1 / W2 can satisfy: 0.09 ≤ W1 / W2 ≤ 0.17. More preferably, the ratio W1 / W2 can satisfy: 0.13 ≤ W1 / W2 ≤ 0.15. Optionally, the ratio W1 / W2 can also be 0.08, 0.1, 0.12, 0.14, 0.16, or 0.18. This ensures sufficient connection strength between the extension 122 and the module base plate 22, and also ensures that the battery pack 100 has sufficient impact resistance.
[0050] In some embodiments, reference Figure 4Two battery modules 20 are located on opposite sides of the beam 121 in the transverse direction. This beam 12 can be called a partition beam. Two extensions 122 extend from the beam 121 to opposite sides in the transverse direction, and each extension 122 is fixedly connected to the bottom plate 11 of the housing and the module bottom plate 22 of the corresponding battery module 20. Since the beam 121 has extensions 122 on opposite sides in the transverse direction, the connection strength between the beam 12 and the module bottom plate 22 can be distributed to both sides. While ensuring the total connection strength remains constant, the ratio W1 of each extension 122 can be smaller. In this case, the ratio W1 / W2 satisfies: 0.06 ≤ W1 / W2 ≤ 0.1. Preferably, the ratio W1 / W2 can satisfy: 0.068 ≤ W1 / W2 ≤ 0.091. More preferably, the ratio W1 / W2 can satisfy: 0.073 ≤ W1 / W2 ≤ 0.085. Alternatively, the ratio W1 / W2 can also be 0.066, 0.071, 0.077, 0.083, 0.089, or 0.094. This still ensures sufficient connection strength between the extension 122 and the module base plate 22, while also ensuring that the battery pack 100 has sufficient impact resistance.
[0051] In some embodiments, reference Figure 4 The casing base plate 11 includes a plate portion 112 and a connecting portion 113. The connecting portion 113 is stacked and fixedly connected to the module base plate 22 and the extension portion 122, forming a three-layer structure of casing base plate 11, module base plate 22, and extension portion 122 at the connecting portion 113. The connecting portion 113 protrudes from the plate portion 112 toward the module base plate 22, so that the bottom surface of the connecting portion 113 is higher than the bottom surface of the plate portion 112. Although the connecting portion 113 can provide some cushioning due to the three-layer structure, its cushioning effect is less than that of the plate portion 112. Therefore, the bottom surface of the connecting portion 113 being higher than the bottom surface of the plate portion 112 can reduce the probability of the connecting portion 113 being impacted, further reducing the risk of damage to the battery pack 21 when the casing base plate 11 is impacted.
[0052] <Example Electrical Equipment>
[0053] This utility model embodiment also provides an electrical device 200, which may include the battery pack 100 described above.
[0054] By way of example only, electrical equipment 200 can be, but is not limited to, vehicles, ships, aircraft, household appliances, and industrial equipment. For example, vehicles can be passenger cars, trucks, construction vehicles, etc.
[0055] In addition, the electrical equipment 200 can also be used for the storage, conversion and release of recyclable electrical energy.
[0056] In a non-restrictive example, refer to Figure 9 The electrical equipment 200 can be an electric vehicle 200, and the battery pack 100 can be used as a power source to provide power to the electric vehicle 200.
[0057] 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 utility model will not describe the various possible combinations separately.
[0058] 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.
[0059] It should be understood that although terms such as "first" or "second" may be used in this invention to describe various elements (such as the first part and the second part), these elements are not defined by these terms, which are only used to distinguish one element from another.
[0060] The basic principles of this utility model have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this utility model are merely examples and not limitations, and should not be considered as essential features of each embodiment of this utility model. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the utility model from being implemented using the aforementioned specific details.
[0061] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.
Claims
1. A battery pack, characterized by, include: The enclosure, including the bottom plate; as well as A battery module, housed within the housing, includes a battery pack and a module base plate. The battery pack is supported on the module base plate, and the module base plate is supported on the housing base plate. The module base plate includes a first part and a second part. The first part is in contact with and fixedly connected to the housing base plate, and the second part is spaced apart from the housing base plate. The area of the first part is S1, and the area of the module base plate is S2. The ratio S1 / S2 satisfies: 0.17≤S1 / S2≤0.
9.
2. The battery pack of claim 1, wherein, The box base plate includes a plate part and a support part. The plate part is spaced apart from the module base plate. The support part protrudes from the plate part toward the module base plate and contacts and is fixedly connected to the first part.
3. The battery pack of claim 2, wherein, The supporting part is a reinforcing rib formed by the deformation of the box bottom plate toward the module bottom plate, and the ratio S1 / S2 satisfies: 0.17≤S1 / S2≤0.
76.
4. The battery pack of claim 2, wherein, The supporting part is a protrusion formed by the bottom plate of the box extending from the plate towards the bottom plate of the module, and the ratio S1 / S2 satisfies: 0.34≤S1 / S2≤0.
9.
5. The battery pack of claim 1, wherein, The bottom plate of the box is welded to the first part, and the ratio S1 / S2 satisfies: 0.51≤S1 / S2≤0.
9.
6. The battery pack according to claim 1, characterized in that, The battery pack comprises multiple cylindrical cells, and the ratio S1 / S2 satisfies: 0.25≤S1 / S2≤0.
9.
7. The battery pack according to claim 6, characterized in that, The plurality of cylindrical batteries are arranged in the box in parallel with the bottom plate of the box along the axial direction, and the ratio S1 / S2 satisfies: 0.58≤S1 / S2≤0.
9.
8. The battery pack according to claim 6, characterized in that, The plurality of cylindrical batteries are arranged axially perpendicular to the bottom plate of the housing in the housing, and the ratio S1 / S2 satisfies: 0.25≤S1 / S2≤0.
79.
9. The battery pack according to claim 1, characterized in that, The battery pack includes multiple prismatic cells, and the ratio S1 / S2 satisfies: 0.17≤S1 / S2≤0.
3.
10. The battery pack according to claim 1, characterized in that, The box base plate includes a base layer and a buffer layer located on the bottom side of the base layer. The buffer layer defines the bottom surface of the box base plate and has less rigidity than the base layer.
11. The battery pack according to claim 10, characterized in that, The base layer is made of metal, and the buffer layer is made of a polymer.
12. The battery pack according to claim 10, characterized in that, The ratio S1 / S2 satisfies: 0.76≤S1 / S2≤0.
9.
13. The battery pack according to claim 1, characterized in that, The enclosure also includes a beam, which includes a beam body and an extension. The battery module is located on one side of the beam body in the lateral direction. The extension extends from the beam body toward the side where the battery module is located. The module base plate, the enclosure base plate, and the extension are stacked and fixedly connected.
14. The battery pack according to claim 13, characterized in that, The extension is located between the module base plate and the box base plate.
15. The battery pack according to claim 13, characterized in that, The dimension of the extension in the lateral direction is W1, and the dimension of the module base plate in the lateral direction is W2. The ratio W1 / W2 satisfies: 0.06≤W1 / W2≤0.
2.
16. The battery pack according to claim 15, characterized in that, The two battery modules are located on opposite sides of the beam in the transverse direction. The two extensions extend from the beam to opposite sides in the transverse direction. Each extension is fixedly connected to the bottom plate of the housing and the module bottom plate of the corresponding battery module. The ratio W1 / W2 satisfies: 0.06≤W1 / W2≤0.
1.
17. The battery pack according to claim 13, characterized in that, The box base plate includes a plate part and a connecting part. The connecting part is stacked and fixedly connected to the module base plate and the extension part. The connecting part protrudes from the plate part toward the module base plate, such that the bottom surface of the connecting part is higher than the bottom surface of the plate part.
18. An electrical appliance, characterized in that, Includes a battery pack according to any one of claims 1 to 17.