Box for power battery pack, power battery pack and vehicle

Abstract

The present disclosure provides a box for a power battery pack, a power battery pack and a vehicle. The box comprises a housing and a support beam arranged in the housing, wherein the housing comprises two first side beams extending along a first direction and two second side beams arranged between the two first side beams and extending along a second direction at an angle to the first direction, and wherein each of the first side beams is provided therein with a first energy-absorbing portion, and each of the second side beams is provided therein with a second energy-absorbing portion, and the support beam is provided therein with a third energy-absorbing portion, and wherein the first energy-absorbing portion, the second energy- absorbing portion and the third energy-absorbing portion are configured to transmit an impact force along the first direction and / or the second direction. According to the present disclosure, the first side beams, the second side beams and the support beam of the box of the power battery pack are provided with corresponding energy-absorbing portions respectively, so that the impact force may be transmitted between the first side beams, the second side beams and the support beam when the power battery pack is subjected to the impact force, thereby avoiding stress concentration in the power battery pack and improving the safety of the power battery pack.

Description

BOX FOR POWER BATTERY PACK, POWER BATTERY PACK AND VEHICLEThis invention claims the priority of the Chinese patent application 202410621122.6 filed on May 20, 2024, of which the content (Text, Drawings and Claims) is incorporated by reference.RELATED FIELD

[0001] The present disclosure relates to the field of vehicles, and in particular to the field of power battery systems of new energy vehicles. More specifically, the present disclosure relates to a box for a power battery pack, a power battery pack using the box and a vehicle using the power battery pack.BACKGROUND

[0002] With the increasing popularity of new energy vehicles, higher and higher requirements are also continuously put forward for its key technology, i.e. battery pack technology, wherein battery pack box carrying battery modules plays a vital role in the safety and the protection of the power battery pack. When a vehicle travels on an uneven road surface or passes through a bumpy road segment, a vibration impact may be generated. An instantaneous impact force may be generated during collision, acceleration and deceleration of the vehicle. This impact force may cause the structure of the battery pack box to be damaged, such as deformation, cracking or breakage, affecting the safety of internal batteries, and further affecting the safety of the power battery pack during use.

[0003] Therefore, there is a need to improve the structure of the battery pack box, so as to improve impact resistance of the battery pack box and further improve the safety and the reliability of the power battery pack.SUMMARY

[0004] It is an object of the present disclosure to solve the above problems in the prior art and to provide a box for a power battery pack, so that the impact resistance of the battery pack boxwill be improved in a cost effective and reliable manner.

[0005] To this end, according to an aspect of the present disclosure, a box for a power battery pack is provided, wherein the box comprises a housing and a support beam arranged in the housing, the housing comprises two first side beams extending along a first direction and two second side beams arranged between the two first side beams and extending along a second direction at an angle to the first direction, and wherein each of the first side beams is provided therein with a first energy- absorbing portion extending along the first direction, and each of the second side beams is provided therein with a second energy- absorbing portion extending along the second direction, and the support beam is provided therein with a third energy-absorbing portion extending along the first direction and / or the second direction, and wherein the first energy- absorbing portion, the second energy-absorbing portion and the third energy-absorbing portion are configured to transmit an impact force along the first direction and / or the second direction.

[0006] According to the above technical concept, the present disclosure may further comprise one or more of the following alternative forms.

[0007] In some alternative forms, the first side beams, the second side beams and the support beam each have a hollow cavity to form the first energy- absorbing portion, the second energyabsorbing portion and the third energy-absorbing portion respectively.

[0008] In some alternative forms, each of the second side beams comprises a vertical side wall extending along the second direction, and the second energy-absorbing portion is provided on the vertical side wall and towards the outside of the housing.

[0009] In some alternative forms, the first energy-absorbing portion comprises an upper rib and a lower rib spaced apart from each other, and the second energy-absorbing portion comprises a top wall and a bottom wall spaced apart from each other, and wherein one of the upper rib and the lower rib corresponds to one of the top wall and the bottom wall of the second energyabsorbing portion.

[0010] In some alternative forms, the support beam comprises a top wall and a bottom wall extending along the first direction and / or the second direction, and a first support rib and a second support rib arranged between the top wall and the bottom wall and spaced apart from each other.

[0011] In some alternative forms, the third energy- absorbing portion is formed by at least one of the top wall, the first support rib, the second support rib and the bottom wall of the support beam, and the third energy-absorbing portion corresponds to one of the upper rib and the lower rib of the first energy-absorbing portion.

[0012] In some alternative forms, each of the first side beams is provided therein with a support rib extending along the first direction, and the support rib is spaced apart from the upper rib and the lower rib and corresponds to one of the first support rib and the second support rib of the support beam.

[0013] In some alternative forms, a section of the first energy-absorbing portion and / or the second energy-absorbing portion and / or the third energy-absorbing portion is configured as any one of triangle, rectangle or trapezoid.

[0014] In some alternative forms, each of the first side beams is provided with a mounting portion extending along the first direction on a side facing the outside of the housing, and a connecting portion is provided between the mounting portion and the first energy-absorbing portion, and wherein a sectional dimension of the connecting portion gradually increases from the mounting portion towards the first energy- absorbing portion.

[0015] In some alternative forms, each of the first side beams is provided therein with a support rib extending along the first direction, and the connecting portion is configured to be hollow and comprises a top wall and a bottom wall spaced apart from each other, and wherein one of the top wall and the bottom wall is connected to the first energy-absorbing portion, and the other of the top wall and the bottom wall is connected to the support rib.

[0016] In some alternative forms, each of the first side beams and / or each of the second side beams and / or the support beam is provided with a protecting portion at the bottom thereof to resist an impact force along a vertical direction.

[0017] According to another aspect of the present disclosure, a power battery pack is provided, wherein the power battery pack comprises a box for a power battery pack as described above, and a battery module accommodated in the box.

[0018] According to another aspect of the present disclosure, a vehicle is provided, wherein the vehicle comprises a power battery pack as described above, and wherein each of first side beamsof the box is provided with a mounting portion extending along a first direction on a side facing the outside of the box, and the power battery pack is attached to the vehicle through the mounting portion.

[0019] According to the present disclosure, the first energy- absorbing portion, the second energy- absorbing portion and the third energy-absorbing portion are provided in each of the first side beams, each of the second side beams and the support beam of the box of the power battery pack respectively, so that the impact force may be transmitted between the first side beams, the second side beams and the support beam when the power battery pack is subjected to an impact, thereby avoiding stress concentration in the power battery pack and improving the safety of the power battery pack.BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features and advantages of the present disclosure will be readily understood through the following optional embodiments described in detail with reference to the accompanying drawings, in which the same reference numerals indicate the same or similar components, in the drawings:

[0021] FIG. 1 is a schematic view of a power battery pack according to an embodiment of the present disclosure;

[0022] FIG. 2 is a schematic view of a box of the power battery pack in FIG. 1;

[0023] FIG. 3 is a schematic view of a transmission trajectory of an impact force within the box of the power battery pack according to an embodiment of the present disclosure when it is subjected to an impact from a certain direction;

[0024] FIG. 4 is a side view of each of first side beams of the box of the power battery pack in FIG. 2;

[0025] FIG. 5 is a side view of each of second side beams of the box of the power battery pack in FIG. 2;

[0026] FIG. 6 is a side view of a support beam of the box of the power battery pack in FIG. 2;

[0027] FIG. 7 is a schematic view of a transmission trajectory of an impact force between one of the first side beams and the support beam when the box of the power battery pack accordingto an embodiment of the present disclosure is subjected to an impact from a direction shown in FIG. 3; and

[0028] FIG. 8 is a schematic view of a transmission trajectory of the impact force between one of the first side beams and one of the second side beams when the box of the power battery pack according to an embodiment of the present disclosure is subjected to the impact from the direction shown in FIG. 3.DETAILED DESCRIPTION

[0029] The implementation and usage of the embodiments are discussed in detail below. However, it should be understood that the specific embodiments discussed herein are merely intended to illustrate specific ways of implementing and applying the present disclosure exemplarily, and are not intended to limit the scope of the present disclosure. When describing structural positions of various components, the direction-related expressions, such as upper, lower and bottom, are not absolute, but relative. When the components are arranged as shown in the drawings, these direction-related expressions are appropriate, but when the positions of these components in the drawings would be changed, these direction-related expressions should be changed accordingly.

[0030] In this context, the terms, such as "install", "connect" and "fix", should be understood in abroad sense unless otherwise specified and defined. For example, it may be fixed connection, detachable connection, or integration; it may be a mechanical connection, or an electrical connection; it may be a direct connection or an indirect connection via an intermediary; and it may be an internal communication of two components or an interaction relationship between two components. For those skilled in the art, specific meanings of the above terms in this context may be understood according to specific situations.

[0031] In this context, “transverse direction” refers to a direction in which an object has a relatively small dimension, also known as a width direction, “longitudinal direction” refers to a direction in which the object has a relatively large dimension, also known as a length direction, and “vertical direction” refers to a direction substantially perpendicular to the ground.

[0032] In this context, the vehicle is a new energy vehicle using a power battery pack as operating power source and / or driving power source, comprising but not limited to batteryelectric vehicle, hybrid vehicle, extended-range vehicle or the like.

[0033] Generally, a power battery pack for a vehicle comprises battery modules, a battery pack box, a battery management module and the like, and the battery pack box used as a carrier of the battery modules plays a vital role in the safety and the protection of the power battery pack. After the power battery pack is equipped to the vehicle, an impact force is generated when the vehicle is subjected to collision, acceleration, deceleration and other situations. This impact force may be transmitted from the battery pack box to the battery module, thereby further extruding the battery module and causing a potential safety hazard.

[0034] As shown in FIG. 1 and FIG. 2, a power battery pack according to an embodiment of the present disclosure comprises a battery pack box, and the battery pack box comprises a housing 100 and a top cover (not shown) attached to the housing 100. A plurality of battery modules 200 may be accommodated in the housing 100 side by side, for example, along a width direction and / or a length direction of the battery modules 200, and the plurality of battery modules 200 are sealed by the top cover. FIG. 1 exemplarily shows eight battery modules 200 accommodated in the housing 100. It may be understood that the number and the distribution of the battery modules 200 may vary depending on different requirements, and are not limited to those shown in the drawings. As shown in FIG. 2, the housing 100 comprises a bottom plate 140 and a plurality of side beams sealingly connected to the bottom plate 140, wherein the plurality of side beams comprise two first side beams 110 extending along a first direction D2 of the housing 100, and two second side beams 120 arranged between the two first side beams 110 and extending along a second direction DI at an angle to the first direction D2. In particular, the first direction D2 is perpendicular to the second direction DI. In the illustrated arrangement, the first direction D2 may be regarded as a transverse direction of the housing, and the second direction DI may be regarded as a longitudinal direction of the housing. The housing 100 further comprises a support beam 130 to provide structural support. In FIG. 2, the housing 100 comprises a support beam 130 extending along the second direction DI. It may be understood that the number and the distribution of the support beam 130 may vary depending on different requirements and are not limited to those shown in the drawings. For example, the housing 100 may comprise a plurality of support beams 130, and the support beams 130 may also extend along the first direction D2.

[0035] At present, an impact force is resisted by providing an additional plate between thesupport beam 130 and each of the first side beams 110. The inventors realized that, this additional plate has a thickness of about 2 mm and needs to be attached between the support beam 130 and each of the first side beams 110 by melt inert-gas welding (MIG welding) to increase the attachment strength, which increases the overall weight and the welding cost of the power battery pack. In addition, this method may cause stress concentration on the additional plate, which may cause the additional plate to break when the impact force is large, thereby affecting the safety of the power battery pack during use.

[0036] The present disclosure solves the above problems by providing a plurality of energyabsorbing portions in the housing 100. Specifically, each of the first side beams 110 is provided therein with a first energy- absorbing portion 111 extending long the first direction D2, and each of the second side beams 120 is provided therein with a second energy-absorbing portion 122 extending along the second direction DI, and the support beam 130 is provided therein with a third energy-absorbing portion extending along the first direction D2 and / or the second direction DI. The first energy- absorbing portion 111, the second energy-ab sorbing portion 122 and the third energy-absorbing portion are adapted to transmit an impact force along the first direction D2 and / or the second direction DI therebetween. In this way, as shown in FIG. 3, when the power battery pack is subjected to an impact force, for example, from a hollow arrow on the right side of FIG. 3 (the same as the second direction DI), the first energy- absorbing portion 111 of one of the first side beams 110 may absorb this impact force and transmit the impact force to each of the second side beams 120 and the support beam 130 respectively along directions of solid arrows in FIG. 3, so that the impact force may be transmitted substantially along the entire battery pack box, and the entire battery pack box may disperse the impact force, reducing the stress concentration in the battery pack box and improving the safety and the reliability of the power battery pack. It may be understood that the impact force to which the power battery pack is subjected and the direction along which the impact force is transmitted are not limited thereto, and may be, for example, along an opposite direction shown by the arrows in FIG. 3 and / or along the first direction D2. When the power battery pack is subjected to an impact force along the first direction D2, the second energy-absorbing portion 122 of one of the second side beams 120 may absorb this impact force and transmit the impact force to each of the first side beams 110 and the support beam 130 along the first direction D2 respectively.

[0037] Structures of the first side beams, the second side beams and the support beam of the battery pack box according to an embodiment of the present disclosure are described in detail below with reference to FIG. 4 to FIG. 6.

[0038] With reference to FIG. 4, each of the first side beams 110 comprises a first energyabsorbing portion 111. The first energy- absorbing portion 111 is provided inside each of the first side beams 110, and the first energy-absorbing portion 111 may comprise an upper rib Illa and a lower rib 111b spaced apart from each other. In this embodiment, the upper rib Illa corresponds to the second energy- absorbing portion 122 of each of the second side beams 120, and the lower rib 111b corresponds to the third energy-absorbing portion of the support beam 130. It may be understood that the arrangement of the first energy-absorbing portion 111, the second energy-absorbing portion 122 and the third energy-absorbing portion may vary depending on different requirements. For example, the upper rib Illa of the first energyabsorbing portion 111 may correspond to the third energy-absorbing portion, and the lower rib 111b of the first energy- absorbing portion 111 may correspond to the second energy- absorbing portion 122. In FIG. 4, a section of the first energy-absorbing portion 111 is configured as triangle to improve the stability of the first energy-absorbing portion 111. It may be understood that the sectional shape of the first energy-absorbing portion 111 is not limited thereto, and may be, for example, rectangle, trapezoid or other polygons, as long as it is adapted to transmit the impact force.

[0039] As shown in FIG. 4, each of the first side beams 110 may be shaped as a hollow cube, that is, each of the first side beams 110 has a hollow cavity to form the first energy-absorbing portion 111, and each of the first side beams 110 may also be provided therein with a support rib 114 extending along the first direction D2, and the support rib 114 is spaced apart from the upper rib Illa and the lower rib 111b. In this way, the weight of each of the first side beams 110 may be reduced while maintaining the support strength of each of the first side beams 110, and the overall weight of the power battery pack may be reduced. In addition, this lightweight design also reduces the manufacturing cost.

[0040] In some embodiments, each of the first side beams 110 may also be provided with a mounting portion 112 extending along the first direction D2 on a side facing the outside of the housing 100, that is, a side away from the battery module 200. The mounting portion 112 may be provided with a plurality of mounting holes 112a (shown in FIG. 1) spaced apart from eachother along the first direction D2, and each of the mounting holes 112a may be, for example, a threaded hole. In this case, the power battery pack may be attached to the vehicle through the mounting portion 112 by using a fastening bolt. It may be understood that the mounting holes 112a are not limited thereto and may vary as required. With continued reference to FIG. 4, a connecting portion 113 may also be provided between the mounting portion 112 and the first energy- absorbing portion 111, and a sectional dimension of the connecting portion 113 gradually increases from the mounting portion 112 towards the first energy-absorbing portion 111, so as to achieve a smooth connection between the mounting portion 112 and the first energy- absorbing portion 111 and further absorb the impact force. In this embodiment, the connecting portion 113 is configured to be hollow and comprises a top wall 113a and a bottom wall 113b spaced apart from each other. Specifically, in the orientation shown in FIG. 4, the top wall 113a of the connecting portion 113 is connected to the first energy-absorbing portion 111, and the bottom wall 113b of the connecting portion 113 is connected to the support rib 114, so as to transitionally connect the mounting portion 112 and the first energy-absorbing portion 111 and transmit the impact force. In this way, when the power battery pack is subjected to an impact force in the first direction D2 and / or the second direction DI, the impact force may act on the mounting portion 112 first, and then be transmitted to the first energy-absorbing portion 111 and / or the second energy-absorbing portion 122 via the connecting portion 113. Thereafter, the first energy- absorbing portion 111 and / or the second energy-absorbing portion 122 transmit the impact force to each of the second side beams 120 and / or each of the first side beams 110 and the support beam 130 respectively, so that the mounting portion 112 and the connecting portion 113 may also absorb part of the impact force, thereby further improving the impact resistance of the battery pack box.

[0041] As shown in FIG. 4, a protecting portion 115 may also be provided at the bottom of each of the first side beams 110. Specifically, the protecting portion 115 is provided on a lower surface of each of the first side beams 110. In this embodiment, the protecting portion 115 is shaped as a hook to resist an impact force from a vertical direction D3. For example, the power battery pack will be subjected to the impact force along the vertical direction D3 when the vehicle wrongly collides with a road shoulder during driving. At this time, the protecting portion 115 may absorb part of the impact force to reduce the impact force transmitted to the inside of the battery pack box, thereby reducing damage to the battery module. It may be understood thatio the configuration and the distribution of the protecting portion 115 may vary depending on different requirements, and are not limited to those shown in the drawings. For example, the protecting portion 115 may also be provided at the bottom of each of the second side beams 120 and / or the support beam 130 to resist the impact force from the vertical direction D3.

[0042] With reference to FIG. 5, each of the second side beams 120 comprises a vertical side wall 121 extending along the second direction DI, a second energy-absorbing portion 122 provided on the vertical side wall 121 and on a side facing the outside of the housing 100 (that is, a side away from the battery module 200), and a base 123 used to support each of the second side beams 120, wherein the second energy- absorbing portion 122 comprises a top wall 122a and a bottom wall 122b spaced apart from each other. In FIG. 5, a section of the second energyabsorbing portion 122 is configured as a hollow rectangle, that is, the second energy- absorbing portion 122 has a hollow cavity. It may be understood that the sectional shape of the second energy- absorbing portion 122 is not limited thereto, and may also be, for example, trapezoid, triangle or other polygons, as long as it is adapted to transmit the impact force. In this way, the weight of each of the second side beams 120 may be reduced while maintaining the support strength of each of the second side beams 120, and the overall weight of the power battery pack may be reduced. In addition, this lightweight design also reduces the manufacturing cost.

[0043] With reference to FIG. 6, the support beam 130 is shaped as a hollow cube, that is, the support beam 130 has a hollow cavity to form the third energy-absorbing portion, and the support beam 130 comprises a top wall 131, a bottom wall 134, and a first support rib 132 and a second support rib 133 parallel to and spaced apart from each other and arranged between the top wall 131 and the bottom wall 134. In this way, the weight of the support beam 130 may be reduced while maintaining the support strength of the support beam 130, and the overall weight of the power battery pack may be reduced. In addition, this lightweight design also reduces the manufacturing cost.

[0044] In some embodiments, the third energy- absorbing portion may be formed by at least one of the top wall 131, the first support rib 132, the second support rib 133 and the bottom wall 134 of the support beam 130, and the third energy-absorbing portion may correspond to one of the upper rib Illa and the lower rib 111b of the first energy- absorbing portion 111, so as to transmit the impact force, for example, along the second direction D2. It may be understood that the configuration of the third energy- absorbing portion is not limited thereto. For example,the section of the third energy-absorbing portion may be configured as rectangle, triangle, trapezoid or the like, so as to transmit the impact force.

[0045] In some embodiments, as shown in FIG. 6 and FIG. 7, each of the first side beams 110 is further provided with a fixing portion 116, and the support beam 130 is provided with a respective fixing hole, so as to fix each of the first side beams 110 and the support beam 130. Specifically, the support beam 130 is fixed to each of the first side beams 110 through a first fixing component 310 and a second fixing component 320. The first fixing component 310 may be, for example, a screw, and the second fixing component 320 may be, for example, a pin, which are not limited herein.

[0046] In an exemplary embodiment, when the power battery pack is subjected to an impact force along the second direction DI, the impact force may be transmitted from one of the first side beams 110 to the support beam 130 along directions of an arrow A, an arrow B and an arrow C shown in FIG. 7. Specifically, in the orientation shown in FIG. 7, the impact force is transmitted from an upper surface of the mounting portion 112 to the first energy- absorbing portion 111 of one of the first side beams 110 via the top wall 113a of the connecting portion 113. Since the lower rib 111b of the first energy- absorbing portion 111 corresponds to the top wall 131 of the support beam 130, the impact force is transmitted directly to the support beam 130 via the lower rib 111b of the first energy-absorbing portion 111 along the direction of the arrow A. Thereafter, the impact force is transmitted on the support beam 130 along the second direction DI. In addition, the impact force is transmitted from a lower surface of the mounting portion 112 to the support rib 114 of one of the first side beams 110 via the bottom wall 113b of the connecting portion 113, and thereafter transmitted inside the support beam 130 along the direction of the arrow B. In particular, the support rib 114 may correspond to one of the first support rib 132 and the second support rib 133 of the support beam 130, so that the impact force is transmitted directly to the first support rib 132 or the second support rib 133 via the support rib 114. In addition, the impact force may also be transmitted from the lower surface of the mounting portion 112 to the bottom wall 134 of the support beam 130 along the direction of the arrow C. In this way, the impact force is transmitted to the support beam 130 via the first energyabsorbing portion 111 of one of the first side beams 110, so as to absorb and disperse the impact force.

[0047] Additionally, the impact force may also be transmitted from one of the first side beams110 to the second side beams 120 along directions of an arrow D and an arrow E shown in FIG. 8. Specifically, in the orientation shown in FIG. 8, the impact force is transmitted from the upper surface of the mounting portion 112 to the first energy- absorbing portion 111 of one of the first side beams 110 via the top wall 113a of the connecting portion 113. In this embodiment, the upper rib Illa of the first energy- absorbing portion 111 corresponds to the bottom wall 122b of the second energy-absorbing portion 122 of each of the second side beams 120. Therefore, the impact force is transmitted directly to the second side beams 120 via the lower rib 111b of the first energy- absorbing portion 111 along the direction of the arrow D. Thereafter, the impact force is transmitted inside the second side beams 120 along the second direction DI. In some embodiments, the upper rib Illa of the first energy-absorbing portion 111 may also correspond to the top wall 122a of the second energy- absorbing portion 122, so as to transmit the impact force to the second side beams 120. In addition, the impact force is also transmitted from the lower surface of the mounting portion 112 to the base 123 of each of the second side beams 120 via the connecting portion 113 along the direction of the arrow E. In this way, the impact force is transmitted to the second side beams 120 via the first energy-absorbing portion 111 of one of the first side beams 110, so as to absorb and disperse the impact force.

[0048] According to the present disclosure, the first energy- absorbing portion, the second energy- absorbing portion and the third energy-absorbing portion are provided on each of the first side beams, each of the second side beams and the support beam of the battery pack box respectively, so that the impact force may be transmitted between each of the first side beams, each of the second side beams and the support beam when the power battery pack is subjected to the impact force, so as to absorb and disperse the impact force, thereby improving the safety and the reliability of the power battery pack. The battery pack box of the present disclosure is simple in structure and economical in cost, and each energy-absorbing portion is easy to mold and is suitable for various power battery packs.

[0049] It should be understood that the embodiments shown in the drawings only illustrate the optional shape, size and arrangement of the power battery pack and the box according to the present disclosure. However, these embodiments are merely intended to be illustrative rather than restrictive. Other shapes, sizes and arrangements may be adopted without departing from the idea and scope of the present disclosure.

[0050] The technical contents and technical features of the present disclosure have beendisclosed above. However, it may be understood that, those skilled in the art can make various changes and improvements to the above-disclosed concept under the creative concept of the present disclosure, and all these various changes and improvements still fall within the scope of protection of the present disclosure. The description of the foregoing embodiments is illustrative rather than restrictive, and the scope of protection of the present disclosure is determined by the appended claims.

Claims

CLAIMS1. A box for a power battery pack, comprising a housing (100) and a support beam (130) arranged in the housing (100), the housing (100) comprising two first side beams (110) extending along a first direction (D2) and two second side beams (120) arranged between the two first side beams (110) and extending along a second direction (DI) at an angle to the first direction (D2), wherein each of the first side beams (110) is provided therein with a first energy-absorbing portion (111) extending along the first direction (D2), and each of the second side beams (120) is provided therein with a second energy- absorbing portion (122) extending along the second direction (DI), and the support beam (130) is provided therein with a third energy- absorbing portion extending along the first direction (D2) and / or the second direction (DI), and wherein the first energy-absorbing portion (111), the second energy- absorbing portion (122) and the third energy- absorbing portion are configured to transmit an impact force along the first direction (D2) and / or the second direction (DI).

2. The box for a power battery pack according to claim 1, wherein the first side beams (110), the second side beams (120) and the support beam (130) each have a hollow cavity to form the first energy-absorbing portion (111), the second energy- absorbing portion (122) and the third energy-absorbing portion respectively.

3. The box for a power battery pack according to claim 2, wherein each of the second side beams (120) comprises a vertical side wall (121) extending along the second direction (DI), and the second energy- absorbing portion (122) is provided on the vertical side wall (121) and towards the outside of the housing (100).

4. The box for a power battery pack according to claim 3, wherein the first energyabsorbing portion (111) comprises an upper rib (Illa) and a lower rib (111b) spaced apart from each other, and the second energy-absorbing portion (122) comprises a top wall (122a) and abottom wall (122b) spaced apart from each other, and wherein one of the upper rib (Illa) and the lower rib (111b) corresponds to one of the top wall (122a) and the bottom wall (122b) of the second energy- absorbing portion (122).

5. The box for a power battery pack according to claim 4, wherein the support beam (130) comprises a top wall (131) and a bottom wall (134) extending along the first direction (D2) and / or the second direction (DI), and a first support rib (132) and a second support rib (133) arranged between the top wall (131) and the bottom wall (134) and spaced apart from each other.

6. The box for a power battery pack according to claim 5, wherein the third energyabsorbing portion is formed by at least one of the top wall (131), the first support rib (132), the second support rib (133) and the bottom wall (134) of the support beam (130), and the third energy- absorbing portion corresponds to one of the upper rib (Illa) and the lower rib (111b) of the first energy-absorbing portion (111).

7. The box for a power battery pack according to claim 5, wherein each of the first side beams ( 110) is provided therein with a support rib ( 114) extending along the first direction (D2) , and the support rib (114) is spaced apart from the upper rib (Illa) and the lower rib (111b) and corresponds to one of the first support rib (132) and the second support rib (133) of the support beam (130).

8. The box for a power battery pack according to any one of claims 1 to 7, wherein a section of the first energy- absorbing portion (111) and / or the second energy-absorbing portion (122) and / or the third energy- absorbing portion is configured as any one of triangle, rectangle or trapezoid.

9. The box for a power battery pack according to any one of claims 1 to 7, wherein each of the first side beams (110) is provided with a mounting portion (112) extending along the first direction (D2) on a side facing the outside of the housing (100), and a connecting portion (113)is provided between the mounting portion (112) and the first energy-absorbing portion (111), and wherein a sectional dimension of the connecting portion (113) gradually increases from the mounting portion (112) towards the first energy-absorbing portion (111).

10. The box for a power battery pack according to claim 9, wherein each of the first side beams (110) is provided therein with a support rib (114) extending along the first direction (D2), and the connecting portion (113) is configured to be hollow and comprises a top wall (113a) and a bottom wall (113b) spaced apart from each other, and wherein one of the top wall (113a) and the bottom wall (113b) is connected to the first energy-absorbing portion (111), and the other of the top wall (113a) and the bottom wall (113b) is connected to the support rib (114).

11. The box for a power battery pack according to any one of claims 1 to 7, wherein each of the first side beams (110) and / or each of the second side beams (120) and / or the support beam (130) is provided with a protecting portion (115) at the bottom thereof to resist an impact force along a vertical direction (D3).

12. A power battery pack comprising a box for a power battery pack according to any one of claims 1 to 11 and a battery module (200) accommodated in the box.

13. A vehicle comprising a power battery pack according to claim 12, wherein each of first side beams (110) of the box is provided with a mounting portion (112) extending along a first direction (D2) on a side facing the outside of the box, and the power battery pack is attached to the vehicle through the mounting portion (112).

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