Battery pack and powered device

Abstract

The present disclosure provides a battery pack. The battery pack comprises a box body and a plurality of battery groups. The box body comprises a plurality of containers stacked along a height direction, each container comprising a cold plate at the bottom thereof and a longitudinal beam extending inside the container along a first direction. The plurality of battery groups are respectively arranged in the plurality of containers. Each battery group comprises a plurality of batteries distributed on opposite sides of the longitudinal beam in a second direction. The height direction, the first direction and the second direction are perpendicular to each other. The longitudinal beam comprises a beam body and a plurality of protrusions protruding upward from the top of the beam body, the plurality of protrusions being arranged at intervals along the first direction. The plurality of protrusions of the longitudinal beam in each container abut against the cold plate in the adjacent upper container to support the cold plate. Accordingly, the battery pack has a higher voltage and a larger capacity, and the cold plate at the bottom of each container can achieve heat dissipation and temperature control of the battery. The plurality of protrusions at the top of the beam body can reduce the proportion of cold energy in the cold plate being wasted by the longitudinal beam while supporting the cold plate.

Description

Technical Field

[0001] This disclosure relates to the field of batteries, and more specifically to a battery pack and an electrical device having the battery pack. Background Technology

[0002] As a crucial energy storage component, the battery pack stores and releases electrical energy by connecting multiple batteries in series or parallel. During charging and discharging, a significant amount of heat is generated internally due to chemical reactions and internal resistance. If this heat is not dissipated in time, the battery temperature will rise sharply, potentially leading to safety issues such as thermal runaway, accelerating battery performance degradation, and reducing output power. To address battery heat dissipation and temperature control, a cooling plate is typically installed within the battery pack. However, the cooling energy circulating within the cooling plate can be conducted to components in the battery pack that do not require heat dissipation through the cooling plate itself or other structures, resulting in ineffective heat dissipation and reducing the cooling efficiency of the cooling plate. Utility Model Content

[0003] In view of this, the present disclosure provides a battery pack to at least solve or improve the problem of cold loss in the cold plate of conventional battery packs.

[0004] The battery pack includes a housing and multiple battery packs. The housing includes multiple containers stacked along its height, each container including a cold plate at its bottom and a longitudinal beam extending inside it along a first direction. Multiple battery packs are disposed within the multiple containers. Each battery pack includes multiple batteries distributed on opposite sides of the longitudinal beam in a second direction. The height direction, the first direction, and the second direction are mutually perpendicular. The longitudinal beam includes a beam body and multiple protrusions extending upward from the top of the beam body, the protrusions being spaced apart from each other along the first direction. The multiple protrusions of the longitudinal beam within each container abut against the cold plate within the adjacent upper container to support the cold plate.

[0005] In this disclosure, by incorporating multiple battery packs, the battery pack can achieve higher voltage and larger capacity, as well as longer-lasting power supply capabilities, further improving the overall stability and lifespan of the battery pack to meet higher energy demands. Since batteries generate heat during operation, overheating can accelerate the degradation of internal battery materials and may lead to reduced charge / discharge efficiency, thus affecting the performance and lifespan of the battery pack. By incorporating a cold plate at the bottom of each container, heat dissipation and temperature control can be achieved when multiple batteries in each container generate heat during operation, preventing overheating and ensuring the performance and lifespan of the battery pack. Secondly, each container is equipped with a longitudinal beam extending along a first direction, which enhances the structural strength of each container, thereby strengthening the overall structure and ensuring better protection of the internal batteries and other components when subjected to external impacts or vibrations. Furthermore, the cold plate located below the battery pack is at risk of deformation due to long-term gravity. Therefore, by incorporating multiple protrusions at the top of the beams to support the cold plates in adjacent upper containers, effective support can be provided for the cold plates, preventing deformation and improving the overall structural stability.

[0006] In addition, during the direct contact between the longitudinal beam and the cold plate, some of the cold energy of the cold plate is absorbed by the longitudinal beam. This means the cold energy in the cold plate is directly transferred to other structures within the battery pack or into the air, rather than being used to cool the battery. This reduces the cooling effect of the cold plate on the battery pack it supports, resulting in ineffective heat dissipation, reduced cooling efficiency, and wasted heat. By providing multiple protrusions spaced apart at the top of the beam, the contact area between the longitudinal beam and the cold plate can be reduced, decreasing the proportion of heat loss from the cold plate that is ineffectively dissipated by the longitudinal beam, thus improving the cooling efficiency for the battery. The spaced protrusions also reduce the weight of the longitudinal beam, effectively reducing the overall weight of the battery pack structure.

[0007] This disclosure also provides an electrical device that includes the battery pack described above. 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 the structure of a battery pack according to an embodiment of the present disclosure.

[0012] Figure 2 for Figure 1 A partial schematic cross-sectional view of the battery pack.

[0013] Figure 3 This is a partial schematic cross-sectional view of a battery pack according to another embodiment of the present disclosure.

[0014] Figure 4 This is a partial schematic cross-sectional view of a battery pack according to another embodiment of the present disclosure.

[0015] Figure 5 This is a schematic diagram of the structure of an electrical device according to an embodiment of the present disclosure.

[0016] Figure Labels Battery pack - 100; Box body - 20; Cover body - 21; Container - 22; Protrusions - 31, 31a, 31b; Beam body - 32; Cold plate - 40; Flow channel - 41; Fastener - 50; Heat insulation pad - 60; Heat insulation block - 70; Crossbeam - 80; Battery - 90; Electrical equipment - 200. 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] <Example Battery Pack> refer to Figure 1 According to one embodiment of this disclosure, a battery pack 100 may include a battery group composed of multiple batteries connected in series and parallel, and integrate a battery management system (BMS), a thermal management system, an electrical connection system (high-voltage / low-voltage connectors, wiring harnesses, etc.), structural components (casing, brackets, etc.), and protective components. The battery pack 100 may also include a housing 20, in which the aforementioned components are housed and sealed by a cover 21, forming a complete functional unit capable of directly outputting electrical energy. The sealed structure formed by the housing 20 and the cover 21 effectively prevents external collisions, compression, and vibrations from affecting the battery group, battery management system (BMS), thermal management system, and other components inside the housing. Furthermore, the sealed structure also prevents external moisture or dust and other contaminants from entering the housing. The battery pack 100 can serve as a rechargeable battery and a power source for new energy vehicles, primarily used for storing and providing electrical energy.

[0019] The housing 20 may include multiple containers 22, which are stacked along their height. Each container 22 includes a cold plate 40 at its bottom and a longitudinal beam extending inside it in a first direction. The battery pack 100 may also include multiple battery groups, which can be electrically connected in series or parallel. The multiple battery groups are respectively disposed in multiple containers, combined... Figure 3 Each battery pack may include multiple batteries 90 distributed on opposite sides of the longitudinal beam in the second direction. The height direction, the first direction, and the second direction are mutually perpendicular. For ease of description, in the accompanying drawings of this disclosure, X is used to indicate the first direction, Y is used to indicate the second direction, and Z is used to indicate the height direction.

[0020] Each battery pack can be formed by connecting multiple batteries 90 with similar capacity and internal resistance. For example, multiple batteries can be connected in series to form a battery pack, or multiple batteries can be connected in parallel to form a battery pack, or a portion of multiple batteries can be connected in series and another portion can be connected in parallel to form a battery pack.

[0021] The battery pack 100 may also include conductive elements. The conductive elements can electrically connect the terminals of at least two batteries, i.e., the output terminals of the battery current, to enable multiple batteries to be connected in series or in parallel.

[0022] A battery is the basic energy storage unit in the battery pack 100, used to store and release electrical energy, and capable of converting chemical energy into electrical energy (discharging process) or storing electrical energy as chemical energy (charging process) through internal chemical reactions. In the battery pack 100, multiple batteries 90 can be electrically connected in series or parallel to meet different voltage, capacity, and power requirements. In some embodiments, the battery 90 is a prismatic battery. In other embodiments, the battery 90 is a cylindrical battery. In other embodiments, the battery 90 is a pouch battery. In other embodiments, the battery 90 may also be other types of batteries. This disclosure does not limit its type.

[0023] Combination Figure 4 Each battery pack is positioned above and in close contact with the cold plate 40. The cold plate 40 may include a flow channel 41 and inlet / outlet ports. The flow channel 41 is located inside the cold plate and allows coolant (such as an aqueous ethylene glycol solution) to circulate along a predetermined path. The coolant flows into the flow channel 41 inside the cold plate from the inlet port. When the battery generates heat, this heat is conducted to the cold plate 40 through the contact surface between the battery 90 and the cold plate 40, and then carried away by the continuously flowing coolant in the flow channel 41 through convection heat transfer. Then, the coolant carrying heat flows out from the outlet port, thereby achieving heat dissipation and temperature control of the battery 90, ensuring the performance and lifespan of the battery pack 100.

[0024] Combination Figure 2The longitudinal beam may include a beam body 32 and a plurality of protrusions 31 extending upward from the top of the beam body 32, the plurality of protrusions 31 being arranged at intervals from each other along a first direction. The plurality of protrusions 31 of the longitudinal beam within each container 22 abut against a cold plate 40 within an adjacent upper container to support the cold plate 40. In some embodiments, the bottom of the lowest container is provided with a bottom plate that abuts against the cold plate within the lowest container to support the cold plate.

[0025] In this disclosure, by incorporating multiple battery packs, the battery pack 100 can achieve higher voltage and larger capacity, as well as longer-lasting power supply capability, further improving the overall stability and lifespan of the battery pack 100 to meet higher energy demands. Since the battery 90 generates heat during operation, overheating may accelerate the degradation of internal materials and reduce charging and discharging efficiency, thus affecting the performance and lifespan of the battery pack 100. By providing a cold plate 40 at the bottom of each container 22, heat dissipation and temperature control can be achieved when the multiple batteries 90 in each container 22 generate heat during operation, preventing overheating and ensuring the performance and lifespan of the battery pack 100. Secondly, each container 22 is equipped with a longitudinal beam extending along a first direction, which enhances the structural strength of each container 22, thereby strengthening the structural strength of the housing 20, improving the overall structural stability, and ensuring better protection of the internal battery packs when subjected to external impacts or vibrations. Furthermore, the cold plate 40 located below the battery packs is at risk of deformation due to long-term gravity. Therefore, by providing multiple protrusions 31 on the top of the beam 32 to support the cold plate 40 in the adjacent upper container, the cold plate 40 can be effectively supported, preventing deformation of the cold plate 40 and thus improving the stability of the overall structure.

[0026] In addition, when the longitudinal beam is in direct contact with the cold plate 40, some of the cold energy of the cold plate 40 will be absorbed by the longitudinal beam. That is, the cold energy in the cold plate will be directly transferred to other structures in the battery pack or to the air through the longitudinal beam, instead of being used to cool the battery 90. This will reduce the cooling effect of the cold plate 40 on the battery pack it supports, resulting in ineffective dissipation of cold energy, reduced cooling efficiency, and waste of cold energy. By providing multiple protrusions 31 spaced apart on the top of the beam 32, the contact area between the longitudinal beam and the cold plate 40 can be reduced, the proportion of cold energy in the cold plate that is ineffectively dissipated by the longitudinal beam can be reduced, and the loss of cold energy in the cold plate can be reduced, thereby improving the cooling efficiency of the battery 90. The multiple protrusions 31 spaced apart can also reduce the weight of the longitudinal beam, thereby effectively reducing the overall weight of the battery pack 400 structure.

[0027] refer to Figure 3The plurality of protrusions 31 may include n protrusions 31 spaced apart along a first direction. The dimensions of the n protrusions in the first direction may be the same or different. The dimensions of the plurality of protrusions 31 in the first direction may be a1 to an, in mm, and the sum of the dimensions of the plurality of protrusions 31 in the first direction is L1, in mm, where L1 = a1 + a2 + ... + an. The dimension of the longitudinal beam in the first direction is L2, in mm. 0.19 ≤ L1 / L2 ≤ 0.41, and / or 300mm ≤ L1 ≤ 500mm, and / or 1200mm ≤ L2 ≤ 1600mm. Preferably, 0.21 ≤ L1 / L2 ≤ 0.38. More preferably, 0.27 ≤ L1 / L2 ≤ 0.31. Alternatively, the ratio L1 / L2 may also be 0.23, 0.25, 0.29, 0.33, 0.35, or 0.40.

[0028] If the ratio L1 / L2 is too small, meaning the sum of the dimensions L1 of the multiple protrusions 31 in the first direction is relatively small, then the multiple protrusions 31 cannot provide effective support for the cold plate 40. The cold plate 40 is prone to deformation under the long-term gravity of the upper battery pack, reducing the overall structural reliability and stability. If the ratio L1 / L2 is too large, meaning the sum of the dimensions L1 of the multiple protrusions 31 in the first direction is relatively large, this increases the contact area between the multiple protrusions 31 and the cold plate 40. This increases the proportion of cold energy in the cold plate that is ineffectively dissipated by the multiple protrusions 31, reducing the cooling effect of the cold plate 40 on the battery 90. Within the reasonable range of 0.19 ≤ L1 / L2 ≤ 0.41, the multiple protrusions 31 can provide effective support for the cold plate 40, preventing deformation and improving the overall structural stability. This structure can also reduce the proportion of cold energy ineffectively dissipated by the longitudinal beams, reducing the loss of cold energy in the cold plate, thereby improving the cooling effect of the cold plate 40 on the battery 90.

[0029] In another embodiment, reference Figure 2 and Figure 3 The battery pack 100 may also include a plurality of fasteners 50. The plurality of protrusions 31 are respectively secured to the cold plate 40 within the adjacent upper container by the plurality of fasteners 50. By way of example only, the fasteners 50 are screws. This disclosure does not specifically limit this.

[0030] According to the above structure, by using fasteners 50 to fix the multiple protrusions 31 and the cold plate 40 in the adjacent upper container, the relative displacement between the multiple protrusions 31 and the cold plate 40 can be avoided when subjected to external impact or vibration, thereby improving the stability of the overall structure and the reliability of long-term use.

[0031] refer to Figure 3The sum of the dimensions of the plurality of protrusions 31 in the first direction is L1, in mm. The dimension of the longitudinal beam in the first direction is L2, in mm. 0.19≤L1 / L2≤0.38. Preferably, 0.21≤L1 / L2≤0.35. More preferably, 0.24≤L1 / L2≤0.29. Alternatively, the ratio L1 / L2 can also be 0.22, 0.26, 0.28, 0.32 or 0.37.

[0032] Since the multiple protrusions 31 are fixedly connected to the cold plate 40 in the adjacent upper container by fasteners 50, the contact between the multiple protrusions 31 and the cold plate 40 is more compact. This makes it easier for the cold energy in the cold plate to be ineffectively dissipated through the multiple protrusions 31, reducing the cooling effect of the cold plate 40 on the battery 91. Therefore, in order to ensure the cooling effect of the cold plate 40 on the battery 90 and reduce the ineffective dissipation of cold energy by the multiple protrusions 31, the sum of the dimensions L1 of the multiple protrusions 31 in the first direction needs to be smaller, that is, the ratio L1 / L2 should be closer to the lower limit of 0.19≤L1 / L2≤0.41.

[0033] Based on this, if the ratio L1 / L2 is too small, meaning the sum of the dimensions L1 of the multiple protrusions 31 in the first direction is relatively small, then the multiple protrusions 31 cannot provide effective support for the cold plate 40. The cold plate 40 is prone to deformation under the long-term gravity of the upper battery pack, reducing the overall structural reliability and stability. If the ratio L1 / L2 is too large, meaning the sum of the dimensions L1 of the multiple protrusions 31 in the first direction is relatively large, this will increase the contact area between the multiple protrusions 31 and the cold plate 40, increasing the proportion of cold energy in the cold plate 40 that is ineffectively dissipated by the multiple protrusions 31, thus reducing the cooling effect of the cold plate 40 on the battery 90. Within the reasonable range of 0.19 ≤ L1 / L2 ≤ 0.38, the multiple protrusions 31 can provide effective support for the cold plate 40, preventing deformation and improving the overall structural stability. This structure can also reduce the proportion of cold energy ineffectively dissipated by the longitudinal beams, reducing the loss of cold energy in the cold plate, thereby improving the cooling effect of the cold plate 40 on the battery 90.

[0034] In another embodiment, reference Figure 3 In the height direction, a heat insulation pad 60 is provided between each protrusion 31 and the cold plate 40. By way of example only, the heat insulation pad 60 is a ceramic fiber pad with a thermal conductivity of R in W / (m·K), where 0.03W / (m·K)≤R≤0.06W / (m·K).

[0035] According to the above structure, by providing a heat insulation pad 60 between each protrusion 31 and the cold plate 40, the heat transferred to the cold plate 40 through each protrusion 31 can be blocked or reduced, the loss of cold energy in the cold plate can be reduced, and the cold energy in the cold plate can be used more concentratedly and effectively to cool the battery 90, thereby improving the cooling efficiency of the cold plate and thus improving the performance of the overall thermal management system.

[0036] In another embodiment, reference Figure 3 A recess is formed between two adjacent protrusions, and a heat insulation block 70 is provided in the recess. The top surface of the heat insulation block 70 is flush with the top surfaces of the plurality of protrusions 31. By way of example only, the heat insulation block 70 is a ceramic fiber block, and the thermal conductivity of the ceramic fiber block is R, with the unit being W / (m·K), where 0.03W / (m·K)≤R≤0.06W / (m·K).

[0037] According to the above structure, the heat insulation block 70 provided in the recess and the multiple protrusions 31 can jointly provide effective support for the cold plate 40. This can evenly distribute the cold plate and the load it bears, avoiding local stress concentration that could lead to deformation of the cold plate. In addition, the heat insulation block 70 can also block or delay the transfer of heat from the longitudinal beam to the cold plate 40.

[0038] refer to Figure 3 The sum of the dimensions of the multiple protrusions in the first direction is L1, in mm, and the dimension of the longitudinal beam in the first direction is L2, in mm, where 0.19 ≤ L1 / L2 ≤ 0.38. Preferably, 0.21 ≤ L1 / L2 ≤ 0.36. More preferably, 0.26 ≤ L1 / L2 ≤ 0.31. Alternatively, the ratio L1 / L2 can also be 0.22, 0.28, 0.33, or 0.35.

[0039] Since a heat insulation block 70 is provided in the recess formed between two adjacent protrusions, and the top surface of the heat insulation block 70 is flush with the top surface of the plurality of protrusions 31, the heat insulation block 70 and the plurality of protrusions 31 can jointly provide support for the cold plate 40, thereby improving the stability of the overall structure. The battery pack 100 with the above structure can also make the sum of the dimensions L1 of the plurality of protrusions 31 in the first direction smaller, that is, the ratio L1 / L2 should be closer to the lower limit of 0.19≤L1 / L2≤0.41, thereby reducing the contact area between the plurality of protrusions 31 and the cold plate 40, reducing the ineffective dissipation of cold energy by the plurality of protrusions 31, improving the cooling efficiency of the cold plate 40, and ensuring the cooling effect of the cold plate 40 on the battery 90.

[0040] Based on this, since the structural strength of the heat insulation material used in the heat insulation block 70 is lower than that of the longitudinal beam, under the long-term gravity of the cold plate 40 and the battery pack above, the heat insulation block 70 will be continuously compressed and unable to provide effective support for the cold plate 40, causing the cold plate 40 to deform. Therefore, if the ratio L1 / L2 is too small, that is, the sum of the dimensions L1 of the multiple protrusions 31 in the first direction is relatively small, this will make the sum of the dimensions of the heat insulation block 70 in the first direction in the recess relatively large. The multiple protrusions 31 and the heat insulation block 70 cannot provide effective support for the cold plate 40, thereby reducing the stability of the overall structure. If the ratio L1 / L2 is too large, that is, the sum of the dimensions L1 of the multiple protrusions 31 in the first direction is relatively large, this will increase the contact area between the multiple protrusions 31 and the cold plate 40, increasing the proportion of the cold energy in the cold plate that is ineffectively dissipated by the multiple protrusions 31, reducing the cooling effect of the cold plate 40 on the battery 90. Within a reasonable range of 0.19 ≤ L1 / L2 ≤ 0.38, multiple protrusions 31 and heat insulation blocks 70 can provide effective support for the cold plate 40, preventing deformation of the cold plate 40 and improving the stability of the overall structure. This structure can also reduce the proportion of cold energy ineffectively dissipated by the longitudinal beams, reduce the loss of cold energy in the cold plate, and thus improve the cooling effect of the cold plate 40 on the battery 90.

[0041] In another embodiment, reference Figure 4 In the second direction, the longitudinal beam is spaced apart from the flow channel 41 in the cold plate 40 in the adjacent upper container.

[0042] The flow channels 41 in the cold plate 40 are the main areas for coolant flow and heat exchange, and also the areas where the cooling capacity is most concentrated. According to the above structure, multiple protrusions 31 can be arranged at intervals with the flow channels 41 in the adjacent upper container in the second direction. That is, multiple protrusions 31 contact the non-flow channel areas in the cold plate. This results in a longer heat exchange path between the multiple protrusions 31 and the flow channels 41, thereby reducing the proportion of cooling capacity in the cold plate that is ineffectively dissipated by the multiple protrusions. This allows the cooling capacity in the cold plate to be more concentrated for cooling the battery, improving the cooling efficiency of the cold plate 40 and thus enhancing the performance of the overall thermal management system.

[0043] Continue to refer to Figure 4 The second direction is the width direction of the multiple batteries 90. In the second direction, the interval distance from the longitudinal beam to the flow channel 41 is D1, in mm, and the size of each battery is W1, 0.034≤D1 / W1≤0.3, and / or, 20mm≤D1≤60mm, and / or, 200mm≤W1≤600mm. Preferably, 0.04≤D1 / W1≤0.25. More preferably, 0.1≤D1 / W1≤0.2. Alternatively, the ratio D1 / W1 can also be 0.07, 0.14, 0.18, 0.23, or 0.28.

[0044] If the ratio D1 / W1 is too large, meaning the distance D1 between the longitudinal beam and the flow channel 41 is relatively large, the flow channel 41 in the cold plate 40 will be closer to the side of the battery away from the longitudinal beam. During the charging and discharging process of the battery 90, heat is generated uniformly inside it. If the flow channel 41 is arranged closer to the side of the battery 90 away from the longitudinal beam, the heat generated on that side can be effectively exchanged through the cold plate 40. However, due to the lack of sufficient heat dissipation path on the side closer to the longitudinal beam, heat will continue to accumulate, causing the local temperature of the battery 90 to be too high. This will not only accelerate the degradation of battery life, but also increase the risk of thermal runaway, which may lead to safety accidents such as fire and explosion in severe cases. If the ratio D1 / W1 is too small, meaning the distance D1 between the longitudinal beam and the flow channel 40 is relatively small, the heat exchange path between the multiple protrusions 31 and the flow channel 41 will be shorter, and the cold energy in the cold plate will be absorbed by the multiple protrusions 31 in the longitudinal beam, resulting in ineffective dissipation of cold energy. Within a reasonable range of 0.034≤D1 / W1≤0.3, the cold plate 40 can effectively dissipate heat from the battery 90 and reduce the proportion of cold energy that is ineffectively dissipated by the multiple protrusions 31, thereby improving the cooling efficiency of the cold plate 40.

[0045] In another embodiment, reference Figure 3 The plurality of protrusions 31 include a longest protrusion 31a and a shortest protrusion 31b. In the first direction, the longest protrusion 31a has a dimension of L3 in mm, and the shortest protrusion 31b has a dimension of L4 in mm, wherein 10 mm ≤ L3 - L4 ≤ 60 mm, and / or 120 mm ≤ L3 ≤ 150 mm, and / or 90 mm ≤ L4 ≤ 110 mm. Preferably, 20 mm ≤ L3 - L4 ≤ 50 mm. More preferably, 30 mm ≤ L3 - L4 ≤ 45 mm. Alternatively, the value of (L3 - L4) can also be 14 mm, 17 mm, 24 mm, 27 mm, 40 mm, 48 mm, 55 mm, or 58 mm.

[0046] During the process of multiple protrusions 31 abutting against the cold plate 40 to support it, the cold plate 40 and the load it bears are evenly distributed to each protrusion 31. If the difference (L3-L4) is too large, that is, either the size L3 of the longest protrusion 31a is too large, or the size L4 of the shortest protrusion 31b is too small, the large dimensional differences of the multiple protrusions 31 in the first direction will cause uneven load distribution, resulting in the load being more concentrated on the longest protrusion 31a. This not only wastes the load-bearing capacity of the shortest protrusion 31b, but may also cause the longest protrusion 31a to be damaged due to excessive load, thus failing to effectively support the cold plate 40 and affecting the stability of the overall structure. Within the reasonable range of 10mm≤L3-L4≤60mm, the dimensions of each protrusion 31 in the first direction are close to or equal, which can make each protrusion 31 bear force evenly, avoid local stress concentration, and improve the stability of the overall structure.

[0047] refer to Figure 3 A recess is formed between two adjacent protrusions, and the multiple recesses on the longitudinal beam include the longest recess and the shortest recess. In the first direction, the length of the longest recess is L5 in mm, and the length of the shortest recess is L6 in mm, where 0.5mm ≤ L5 - L6 ≤ 10mm, and / or 25mm ≤ L5 ≤ 50mm, and / or 15mm ≤ L6 ≤ 49.5mm. Preferably, 2mm ≤ L5 - L6 ≤ 8mm. More preferably, 4mm ≤ L5 - L6 ≤ 6mm. Alternatively, the value of (L5 - L6) can also be 1mm, 1.5mm, 2.5mm, 3mm, 3.5mm, 4.5mm, 5mm, 5.5mm, 6.5mm, 7mm, 7.5mm, 8.5mm, or 9mm.

[0048] During the process of multiple protrusions 31 abutting against the cold plate 40 to support the cold plate 40, the cold plate 40 and the load it bears are evenly distributed to each protrusion 31. If the difference (L5-L6) is too large, that is, the size L5 of the longest concave part is too large, and / or the size L6 of the shortest concave part is too small, that is, the distance between two adjacent protrusions is too large, and / or the distance between two adjacent protrusions is too small, some adjacent protrusions are more dispersed, and / or some adjacent protrusions are more concentrated.

[0049] When the distance between two adjacent protrusions is too large, the protrusions cannot effectively support the cold plate, and the cold plate is prone to deformation due to the reduced number of supporting protrusions, thus affecting the stability of the overall structure. When the distance between two adjacent protrusions is too small, the multiple protrusions 31 will be distributed too closely, which will reduce the proportion of cold energy in the cold plate that is ineffectively dissipated by the longitudinal beams, thus reducing the cooling efficiency of the cold plate 40. Within a reasonable range of 0.5mm≤L5-L6≤10mm, the longest and shortest concave parts are similar or equal in size in the first direction, that is, the multiple concave parts are similar or equal in size in the first direction. This ensures that the multiple protrusions 31 are relatively evenly distributed on the top of the beam 32 in the first direction, so that each protrusion 31 is subjected to uniform force, avoiding local stress concentration and improving the reliability and stability of the overall structure. It can also reduce the proportion of cold energy ineffectively dissipated by the longitudinal beams.

[0050] In another embodiment, reference Figure 4 Each container 22 may also include a crossbeam 80 extending in a second direction, the crossbeam 80 being below the plurality of protrusions 31.

[0051] By incorporating crossbeams 80 extending in the second direction within each container 22, the structural strength of the containers is further enhanced, thereby strengthening the overall structure of the enclosure. This allows the enclosure to better protect internal components such as batteries from external impacts or vibrations.

[0052] In another embodiment, reference Figure 2 The container comprises a first layer of containers to a second layer of containers arranged from top to bottom in the height direction. The sum of the dimensions of the multiple protrusions in the first layer of containers is greater than the sum of the dimensions of the multiple protrusions in the first layer of containers in the first direction, and 2≤X≤N.

[0053] As multiple containers are stacked along the height direction, the load borne by the containers arranged sequentially from the top to the bottom (layer 1 to layer N) gradually increases. To ensure the stability of the overall structure, the sum of the dimensions of the multiple protrusions in the first direction within the X-th layer container is greater than the sum of the dimensions of the multiple protrusions in the first direction within the (X-1)-th layer container, where 2 ≤ X ≤ N. This larger sum of dimensions of the multiple protrusions in the first direction allows the lower layer containers to provide a larger supporting contact area, thus enabling the lower layer containers to adequately support the upper layer containers. This prevents the lower layer containers from deforming or being damaged due to insufficient structural strength, improving the stability and safety of the overall structure.

[0054] In another embodiment, reference Figure 2 The container 20 may also include a cover 21. The cover 21 is placed on top of the uppermost container, and a plurality of protrusions 31 of the longitudinal beams inside the uppermost container abut against the cover 21 to support the cover 21.

[0055] According to the above structure, the multiple protrusions 31 can effectively prevent the cover 21 from deforming due to external pressure or its own weight, thus ensuring the sealing and stability of the overall structure of the battery pack 100.

[0056] In another embodiment, reference Figure 2 The plurality of containers 22 include a first layer of containers to a Nth layer of containers arranged sequentially from top to bottom in the height direction. A plurality of protrusions in the Xth layer of containers are staggered with a plurality of protrusions in the (X-1)th layer of containers along a first direction, where 2≤X≤N. A recess is formed between two adjacent protrusions in the (X-1)th layer of containers. Fasteners pass through the bottom surface of the recess, through the longitudinal beam and the cold plate 40 in the (X-1)th layer of containers, and are fixedly connected to a corresponding protrusion 31 in the Xth layer of containers.

[0057] The battery pack with the above-described structure allows for independent disassembly and assembly of multiple containers 22, facilitating the assembly and maintenance of the battery pack 100. Fasteners 50 securely connect adjacent containers, preventing relative displacement between them under external impact or vibration. Simultaneously, multiple protrusions 31 can be fixedly connected to the cold plate 40, improving the overall structural reliability and stability. Furthermore, the staggered arrangement of multiple protrusions 31 in the X-1 layer container and the X-1 layer container along the first direction avoids stress concentration. Additionally, the relatively small height distance between the recess in the X-1 layer container and a corresponding protrusion in the X-1 layer container allows for the fasteners 50 to pass through the bottom of the recess, the longitudinal beam and cold plate 40 in the X-1 layer container, and be fixedly connected to a corresponding protrusion 31 in the X-1 layer container. This reduces the shear force and bending moment borne by the fasteners 50, making them less prone to loosening or failure under long-term vibration and load, thereby improving the overall structural stability and safety.

[0058] <Example Electrical Equipment> This disclosure also provides an electrical device 200, which may include the battery pack described above.

[0059] By way of example only, electrical equipment can be, but is not limited to, vehicles, ships, aircraft, household appliances, and industrial equipment. For example, vehicles can be passenger cars, trucks, forklifts, construction vehicles, etc.

[0060] In addition, the electrical equipment 200 can also be used for the storage, conversion and release of recyclable electrical energy.

[0061] In a non-restrictive example, refer to Figure 5 The electrical equipment 200 can be an electric vehicle 200, and the battery pack 100 can be used as a power source to power the electric vehicle.

[0062] 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.

[0063] 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 does not imply the exclusion of other components or parts.

[0064] It should be understood that although terms such as “first” or “second” may be used in this disclosure to describe various elements (such as a first direction and a second direction), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0065] 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.

[0066] 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, include: The housing includes multiple containers stacked along the height direction, each container including a cold plate at its bottom and a longitudinal beam located inside it and extending along a first direction; as well as Multiple battery packs are respectively disposed in the multiple containers, and each battery pack includes multiple batteries distributed on opposite sides of the longitudinal beam in the second direction, wherein the height direction, the first direction and the second direction are perpendicular to each other; The longitudinal beam includes a beam body and a plurality of protrusions extending upward from the top of the beam body. The plurality of protrusions are arranged at intervals along the first direction, and the plurality of protrusions of the longitudinal beam in each container support the cold plate in the adjacent upper container.

2. The battery pack according to claim 1, characterized in that, The sum of the dimensions of the plurality of protrusions in the first direction is L1, in mm, and the dimension of the longitudinal beam in the first direction is L2, in mm, where 0.19 ≤ L1 / L2 ≤ 0.

41.

3. The battery pack according to claim 2, characterized in that, 300mm≤L1≤500mm, and / or, 1200mm≤L2≤1600mm.

4. The battery pack according to claim 1, characterized in that, It also includes a plurality of fasteners, the plurality of protrusions being fixedly connected to the cold plate inside the adjacent upper container by the plurality of fasteners.

5. The battery pack according to claim 4, characterized in that, The sum of the dimensions of the plurality of protrusions in the first direction is L1, in mm, and the dimension of the longitudinal beam in the first direction is L2, in mm, where 0.19 ≤ L1 / L2 ≤ 0.

38.

6. The battery pack according to claim 1, characterized in that, In the height direction, a heat insulation pad is provided between each protrusion and the cold plate.

7. The battery pack according to claim 1, characterized in that, A recess is formed between two adjacent protrusions, and a heat insulation block is provided in the recess. The top surface of the heat insulation block is flush with the top surface of the plurality of protrusions.

8. The battery pack according to claim 7, characterized in that, The sum of the dimensions of the plurality of protrusions in the first direction is L1, in mm, and the dimension of the longitudinal beam in the first direction is L2, in mm, where 0.19 ≤ L1 / L2 ≤ 0.

38.

9. The battery pack according to claim 1, characterized in that, In the second direction, the longitudinal beam is spaced apart from the flow channels in the cold plate within the adjacent upper container.

10. The battery pack according to claim 9, characterized in that, The second direction is the width direction of the plurality of batteries. In the second direction, the distance between the longitudinal beam and the flow channel is D1, in mm. The size of each battery is W1, and 0.034≤D1 / W1≤0.

3.

11. The battery pack according to claim 10, characterized in that, 20mm≤D1≤60mm, and / or, 200mm≤W1≤600mm.

12. The battery pack according to claim 1, characterized in that, The plurality of protrusions includes the longest protrusion and the shortest protrusion. In the first direction, the length of the longest protrusion is L3 in mm, and the length of the shortest protrusion is L4 in mm, where 10 mm ≤ L3 - L4 ≤ 40 mm.

13. The battery pack according to claim 12, characterized in that, 120mm≤L3≤150mm, and / or, 90mm≤L4≤110mm.

14. The battery pack according to claim 12, characterized in that, A recess is formed between two adjacent protrusions. The plurality of recesses on the longitudinal beam include the longest recess and the shortest recess. In the first direction, the length of the longest recess is L5 in mm, and the length of the shortest recess is L6 in mm, where 0.5 mm ≤ L5 - L6 ≤ 10 mm.

15. The battery pack according to claim 14, characterized in that, 25mm≤L5≤50mm, and / or, 15mm≤L6≤49.5mm.

16. The battery pack according to claim 1, characterized in that, Each container also includes a crossbeam extending along the second direction, the crossbeam being lower than the plurality of protrusions.

17. The battery pack according to claim 1, characterized in that, The plurality of containers include a first layer of containers to a Nth layer of containers arranged from top to bottom in the height direction, wherein the sum of the dimensions of the plurality of protrusions in the Xth layer of containers in the first direction is greater than the sum of the dimensions of the plurality of protrusions in the (X-1)th layer of containers in the first direction, and 2≤X≤N.

18. The battery pack according to claim 1, characterized in that, The container also includes a cover, which is placed on top of the uppermost container, and the plurality of protrusions of the longitudinal beam inside the uppermost container abut against the cover to support the cover.

19. The battery pack according to claim 1, characterized in that, The plurality of containers include a first layer of containers to a Nth layer of containers arranged from top to bottom in the height direction. The plurality of protrusions in the Xth layer of containers are staggered with the plurality of protrusions in the (X-1)th layer of containers along the first direction, where 2≤X≤N. A recess is formed between two adjacent protrusions in the (X-1)th layer of containers. Fasteners pass through the bottom surface of the recess, through the longitudinal beam and cold plate in the (X-1)th layer of containers, and are fixedly connected to a corresponding protrusion in the Xth layer of containers.

20. An electrical appliance, characterized in that, Includes the battery pack according to any one of claims 1 to 19.

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