Battery pack box body and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pack box body and a battery pack, the battery pack box body comprises a bottom plate, a first edge beam and a second edge beam which extend along a first direction and are arranged at an interval, and a third edge beam extending along a second direction, the bottom plate, the first edge beam, the second edge beam and the third edge beam jointly define a mounting space. The limiting cross beam extends in the first direction and is arranged in the mounting space, and the limiting cross beam divides the mounting space into a battery cell area and an electrical area; the first longitudinal beam is arranged in the battery cell area, and the first longitudinal beam extends in the second direction and is supported between the second edge beam and the limiting cross beam; and the second longitudinal beam is arranged in the electrical area, extends in the second direction and is supported between the first edge beam and the limiting cross beam. According to the battery pack box body provided by the utility model, the invasion risk of the battery cell area and the electrical area is reduced, and the safety of the battery pack is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery pack technology, specifically to a battery pack housing and a battery pack. Background Technology

[0002] During the design of the battery pack housing, it is necessary to consider the deformation caused by collisions, which could threaten the safety of the internal cells and high-voltage electrical components. After the battery pack is assembled, it must meet the requirements of collision and compression tests to ensure its safety and reliability.

[0003] However, the existing enclosure design does not have a high structural strength protection zone in the high-voltage electrical component area. The structural strength of the rear of the enclosure is entirely provided by the rear enclosure wall and the side ribs of the bottom protective plate. The impact force from the rear of the battery pack is not strongly transmitted through the middle of the battery pack. The impact force is almost entirely transmitted and absorbed by the side beams. However, when the impact force exceeds its structural strength or the tensile strength of the material, the side beams will undergo large deformation, which will threaten the safety of the cell area. Utility Model Content

[0004] In view of this, the present invention provides a battery pack housing and a battery pack to solve the problem that existing battery pack housings cannot ensure the safety of high-voltage electrical components and battery cells.

[0005] In a first aspect, this utility model provides a battery pack housing having a three-dimensional shape with intersecting first, second, and third directions. The battery pack housing includes:

[0006] The base plate includes a first side beam and a second side beam that extend along a first direction and are spaced apart, and a third side beam that extends along the second direction. The first side beam is located on one side of the base plate in the second direction, the second side beam is located on the other side of the base plate in the second direction, and the third side beam is located on both sides of the base plate in the first direction. The base plate, the first side beam, the second side beam, and the third side beam together enclose an installation space.

[0007] A limiting beam extends along the first direction and is built into the installation space, dividing the installation space into a cell area and an electrical area.

[0008] The first longitudinal beam is built into the cell area, and the first longitudinal beam extends along the second direction and is supported between the second side beam and the limiting crossbeam.

[0009] The second longitudinal beam is built into the electrical area. The second longitudinal beam extends along the second direction and is supported between the first side beam and the limiting crossbeam.

[0010] Beneficial Effects: The battery pack housing provided by this utility model, by setting a first longitudinal beam in the cell area, extending along the second direction Y and supported between the second side beam and the limiting crossbeam, forms a separate cell protection zone together with the first longitudinal beam, the second side beam, the limiting crossbeam, and the third side beam. This enhances the overall structural strength and deformation resistance of the cell area, ensuring it can withstand high-intensity impacts during external impacts, thus ensuring the safety of the cell area. Similarly, by setting a second longitudinal beam in the electrical area, extending along the second direction Y and supported between the first side beam and the limiting crossbeam, this forms a separate electrical component protection zone together with the first side beam, the limiting crossbeam, and the third side beam. This enhances the overall structural strength and deformation resistance of the electrical area, ensuring it can withstand high-intensity impacts during external impacts, thus ensuring the safety of the electrical area. Furthermore, it can absorb and rationally transmit the impact force to the second side beam, reducing the intrusion risk to the cell area and the electrical area, and improving the safety of the battery pack.

[0011] In one alternative embodiment, the battery pack housing further includes an energy-absorbing beam disposed between the second longitudinal beam and the limiting crossbeam. The cross-section of the energy-absorbing beam is circumferentially closed, and the shape of the cross-section is configured to include an angled shape that is recessed into the energy-absorbing beam in a third direction.

[0012] Beneficial effects: The energy-absorbing beam is built into the electrical zone and is located between the second longitudinal beam and the limiting crossbeam, which further enhances the overall structural strength and deformation resistance of the electrical component protection zone. When the battery pack is impacted from the rear, the impact energy is transferred from the first side beam to the energy-absorbing beam through the second longitudinal beam. At this time, the angle and shape of the energy-absorbing beam are concave and collapse inward and collapse and absorb energy in a preset direction, which maximizes the safety of the electrical zone and effectively reduces the risk of rear intrusion of the battery pack.

[0013] In one alternative embodiment, the cross-section of the energy-absorbing beam includes a first wall spaced apart from each other along a second direction and a second wall spaced apart from each other along a third direction; wherein the second wall includes a first bend extending inward toward the interior of the energy-absorbing beam and a second bend extending outward toward the exterior of the energy-absorbing beam, forming an angled shape that is recessed inward toward the interior of the energy-absorbing beam.

[0014] Beneficial effects: During the application of external impact, the first and second bending parts are recessed into the energy-absorbing beam and collapse to absorb energy in a preset direction, so as to prevent the energy-absorbing beam from deforming towards the battery pack cover and avoid unpredictable deformation of the battery pack during the collision.

[0015] In one optional embodiment, the first bend is connected to the first wall and is set at a first preset deformation angle β1 with the first wall, where β1 satisfies 70°≤β1≤80°; the second bend is located on the side of the first bend away from the first wall and is set at a second preset deformation angle β2 with the first wall, where β2 satisfies 30°≤β2≤45°.

[0016] Beneficial effects: This ensures that the energy-absorbing beam can collapse and absorb energy in a preset direction during external impact, preventing the energy-absorbing beam from deforming towards the battery pack cover and avoiding unpredictable deformation of the battery pack during a collision, thereby further improving safety and ensuring the safety of the electrical area and the cell area.

[0017] In one optional embodiment, the compressive yield strength of the first longitudinal beam is σ1, the overall compressive yield strength of the second longitudinal beam is σ2, the compressive yield strength of the limiting crossbeam is σ3, and the compressive yield strength of the energy-absorbing beam is σ4, where σ1≥σ2≥σ3≥σ4.

[0018] And / or, where σ1-σ2≥30MPa, σ2-σ3≥30MPa, σ3-σ4≥30MPa;

[0019] And / or, the wall thickness of the energy-absorbing beam is H4, where H4 satisfies 1mm≤H4≤2.5mm; the dimension of the energy-absorbing beam along the second direction is W, where W satisfies ≥25mm.

[0020] Beneficial effects: This ensures that the main kinetic energy and impact energy are absorbed by the energy-absorbing beam. Only when the energy-absorbing beam reaches its deformation limit will the remaining kinetic energy and impact energy affect the first and second longitudinal beams, effectively reducing the intrusion risk to the cell area and electrical area and improving the safety of the battery pack. The wall thickness H4 of the energy-absorbing beam meets the requirement of 1mm≤H4≤2.5mm, and the dimension W of the energy-absorbing beam along the second direction Y meets the requirement of ≥25mm, thereby ensuring sufficient total energy absorption and collapsing deformation space of the energy-absorbing beam, and ensuring that the main kinetic energy and impact energy are absorbed by the energy-absorbing beam, effectively reducing the intrusion risk to the cell area and electrical area.

[0021] In one alternative embodiment, the cross-section of the first longitudinal beam includes a first frame portion and a plurality of second frame portions arranged circumferentially around the first frame portion, wherein the second frame portions are centrally symmetrically arranged relative to the first frame portion at least in a first direction and a third direction.

[0022] Beneficial effects: The first longitudinal beam adopts a highly symmetrical structure, which helps to enhance the torsional resistance of the first longitudinal beam and reduce the twisting during extrusion.

[0023] The dimension of the first longitudinal beam cross-section along the first direction is L1, and the dimension of the first longitudinal beam cross-section along the third direction is L2, where L1 = L2;

[0024] And / or, a transition fillet R is formed between two adjacent second frame portions in the cross section of the first longitudinal beam, wherein R satisfies 5mm≤R≤10mm.

[0025] Beneficial effects: The first longitudinal beam adopts a structure with a high central symmetry, and the dimension of the first longitudinal beam along the first direction is equal to the dimension of the first longitudinal beam along the third direction, thereby enhancing the torsional resistance of the first longitudinal beam and reducing the twisting during extrusion; the transition radius R of the first longitudinal beam satisfies 5mm≤R≤10mm, thereby improving the overall structural strength of the first longitudinal beam, ensuring the torsional resistance of the first longitudinal beam, and reducing the twisting during extrusion.

[0026] In one optional embodiment, the first side beam is provided with a plurality of connector interfaces on the side facing the limiting crossbeam along the second direction, and the plurality of connector interfaces are spaced apart along the first direction.

[0027] The end of the second longitudinal beam extending along the second direction and close to the first side beam is offset from the connector interface; the distance between the second longitudinal beam and the connector interface along the first direction is P, where P satisfies 20mm≤P≤30mm.

[0028] Beneficial effects: This allows the second longitudinal beam to avoid the connector interface, ensuring that the second longitudinal beam abuts against the wall of the first side beam, guaranteeing the overall structural strength and deformation resistance of the electrical area, ensuring that it can withstand high-intensity impacts during external impacts, and ensuring the safety of the electrical area.

[0029] In one optional embodiment, the wall thickness of the first longitudinal beam is H1, where H1 satisfies H1≥H3; the wall thickness of the second longitudinal beam is H2, where H2 satisfies H2≥H3, where H3 is the wall thickness of the third side beam.

[0030] The dimension of the second longitudinal beam along the first direction is Q, and Q satisfies Q≥25mm.

[0031] Beneficial effects: The wall thickness H1 of the first longitudinal beam is improved by satisfying H1≥H3, thereby enhancing the overall structural strength of the first longitudinal beam, ensuring its torsional resistance, and reducing the twisting during extrusion. The wall thickness H2 of the second longitudinal beam is improved by satisfying H2≥H3, where H3 is the wall thickness of the third side beam. At the same time, the dimension of the second longitudinal beam along the first direction X is improved by satisfying Q≥25mm, thereby enhancing the structural strength of the second longitudinal beam and ensuring the overall structural strength and deformation resistance of the electrical area.

[0032] Secondly, the present invention also provides a battery pack, including: a battery cell, and a battery pack housing as described above;

[0033] The length of a single battery cell is less than 600 mm, and the battery cells are arranged on both sides of the first longitudinal beam in the first direction; several battery cells are stacked along the second direction; an explosion-proof valve is provided on the side of the battery cell facing the first longitudinal beam along the first direction.

[0034] The distance between the battery cell and the first longitudinal beam along the first direction is M, where M satisfies 30mm≤M≤50mm.

[0035] Beneficial effects: The battery pack provided by this utility model, by adopting the above-mentioned battery pack housing, reduces the risk of intrusion into the cell area and electrical area, thereby improving the safety of the battery pack. The distance M between the individual battery cells and the first longitudinal beam along the first direction X satisfies 30mm≤M≤50mm, ensuring sufficient venting space for the explosion-proof valve, thus improving the safety of the battery pack, while also guaranteeing the energy density of the battery pack. Attached Figure Description

[0036] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 This is a top view of a battery pack housing according to an embodiment of the present utility model;

[0038] Figure 2 for Figure 1 Sectional view of section AA;

[0039] Figure 3 for Figure 2 A magnified view of a portion of point B in the middle;

[0040] Figure 4 This is a cross-sectional view of the energy-absorbing beam of a battery pack housing according to an embodiment of the present invention along a third direction;

[0041] Figure 5 for Figure 4 Detailed structural diagram of the angle shape of the energy-absorbing beam;

[0042] Figure 6 This is a schematic diagram illustrating the directional collapse principle of the energy-absorbing beam of a battery pack housing according to an embodiment of the present invention.

[0043] Figure 7 This is a cross-sectional view of the first longitudinal beam of a battery pack housing according to an embodiment of the present invention along a third direction;

[0044] Figure 8This is a perspective view of a battery pack housing according to an embodiment of the present utility model;

[0045] Figure 9 This is a schematic diagram showing the relative position of the second longitudinal beam and the connector interface of a battery pack housing according to an embodiment of the present invention.

[0046] Figure 10 for Figure 9 A magnified view of a portion of point C in the middle;

[0047] Figure 11 This is a top view of a battery pack according to an embodiment of the present utility model;

[0048] Figure 12 for Figure 11 Sectional view of section DD;

[0049] Figure 13 for Figure 12 A magnified view of a portion of point E in the middle;

[0050] Figure 14 for Figure 12 A magnified view of a portion of point F in the middle.

[0051] Explanation of reference numerals in the attached figures:

[0052] 10. Base plate; 100. Installation space; 101. Battery cell area; 102. Electrical area; 11. First side beam; 111. Connector interface; 12. Second side beam; 13. Third side beam; 14. Limiting crossbeam;

[0053] 20. First longitudinal beam; 21. First frame section; 22. Second frame section;

[0054] 30. Second longitudinal beam;

[0055] 40. Energy-absorbing beam; 400. Directional collapse space; 401. Angular shape; 41. First wall; 42. Second wall; 421. First bend; 422. Second bend;

[0056] 50. Battery cell; 51. Explosion-proof valve;

[0057] X—first direction; Y—second direction; Z—third direction. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0059] The following is combined Figures 1 to 14 The following describes embodiments of the present invention.

[0060] According to an embodiment of the present invention, in one aspect, a battery pack housing is provided, having a three-dimensional shape with intersecting first directions X, second directions Y, and a third direction Z. The battery pack housing includes: a base plate 10 having a plane extending substantially along the first direction X and the second direction Y; as shown in the figure. Figure 1 As shown, it may have a width dimension in the first direction X and a length dimension in the second direction Y.

[0061] The battery pack housing includes: a first side beam 11 and a second side beam 12 extending along a first direction X, the first side beam 11 and the second side beam 12 being spaced apart in a second direction Y, wherein the first side beam 11 is located on one side of the base plate 10 in the second direction Y, and the second side beam 12 is located on the other side of the base plate 10 in the second direction Y; and a third side beam 13 being spaced apart on both sides of the base plate 10 in the first direction X, the base plate 10, the first side beam 11, the second side beam 12 and the third side beam 13 together enclosing an installation space 100;

[0062] Limit beam 14, please refer to Figure 1 As shown, the limiting beam 14 extends along the first direction X and is built into the installation space 100, dividing the installation space 100 into a cell area 101 and an electrical area 102.

[0063] First longitudinal beam 20, see still Figure 1 As shown, the first longitudinal beam 20 extends along the second direction Y and is supported between the second side beam 12 and the limiting crossbeam 14, which is built into the cell area 101.

[0064] The second longitudinal beam 30 is still referred to. Figure 1 As shown, the second longitudinal beam 30 extends along the second direction Y and is supported between the first side beam 11 and the limiting crossbeam 14, and is built into the electrical area 102.

[0065] The battery pack housing provided by this utility model, by setting a first longitudinal beam 20 in the cell area 101, such that the first longitudinal beam 20 extends along the second direction Y and is supported between the second side beam 12 and the limiting crossbeam 14, thereby making the first longitudinal beam 20, the second side beam 12, the limiting crossbeam 14 and the third side beam 13 together form a separate cell protection zone, enhancing the overall structural strength and deformation resistance of the cell area 101, ensuring that it can withstand high-intensity impacts during external impact, and ensuring the safety of the cell area 101; by setting a second longitudinal beam 30 in the electrical area 102, such that the first longitudinal beam 20 extends along the second direction Y and is supported between the second side beam 12 and the limiting crossbeam 14, thereby making the first longitudinal beam 20, the second side beam 12, the limiting crossbeam 14 and the third side beam 13 together form a separate cell protection zone, enhancing the overall structural strength and deformation resistance of the cell area 101, ensuring that it can withstand high-intensity impacts during external impacts, and ensuring the safety of the cell area 101; by setting a second longitudinal beam 30 in the electrical area 102, such that the first longitudinal beam 20 extends along the second direction Y and is supported between the second side beam 12 and the limiting crossbeam 14, the battery pack housing provides a separate cell protection zone, enhancing the overall structural strength and deformation resistance of the cell area 101, ensuring that it can withstand high-intensity impacts during external impacts, and ensuring the safety of the cell area 101; The two longitudinal beams 30 extend along the second direction Y and are supported between the first side beam 11 and the limiting crossbeam 14, so that the second longitudinal beam 30, together with the first side beam 11, the limiting crossbeam 14 and the third side beam 13, form a separate electrical component protection zone, which enhances the overall structural strength and deformation resistance of the electrical zone 102, ensures that it can withstand high-intensity impacts during external impacts, ensures the safety of the electrical zone 102, and can absorb and reasonably transmit the impact force to the second side beam 12, reducing the intrusion risk of the cell zone 101 and the electrical zone 102, and improving the safety of the battery pack.

[0066] Furthermore, several second longitudinal beams 30 are evenly spaced along the first direction X within the electrical zone 102, which helps to improve the uniformity and consistency of impact resistance.

[0067] In some embodiments, please combine Figure 1 and Figure 2 As shown, the battery pack housing also includes an energy-absorbing beam 40, which is positioned between the second longitudinal beam 30 and the limiting crossbeam 14. (See also...) Figure 4 As shown, the cross-section of the energy-absorbing beam 40 is circumferentially closed, and the shape of the cross-section is configured to include an angle shape 401 that is recessed into the energy-absorbing beam 40 in the third direction Z.

[0068] It should be noted that the energy-absorbing beam 40 adopts the structural form of a directional collapse energy-absorbing beam. "Collapse energy absorption" refers to using the kinetic energy generated during a collision to absorb the impact force during the collision.

[0069] In this embodiment, the energy-absorbing beam 40 is built into the electrical zone 102. The energy-absorbing beam 40 is located between the second longitudinal beam 30 and the limiting crossbeam 14, which further enhances the overall structural strength and deformation resistance of the electrical component protection zone. When the battery pack is impacted from the rear, the impact force and energy are transmitted from the first side beam 11 to the energy-absorbing beam 40 via the second longitudinal beam 30. At this time, the angle shape 401 of the energy-absorbing beam 40 is concave and collapses into the interior of the energy-absorbing beam 40 and collapses and absorbs energy in a preset direction, which maximizes the safety of the electrical zone 102 and effectively reduces the risk of rear intrusion of the battery pack.

[0070] It should be noted that during the collapse of the energy-absorbing beam 40, some kinetic energy and impact energy will also be transferred to the second side beam 12 along the first longitudinal beam 20. However, the main kinetic energy and impact energy will be absorbed by the energy-absorbing beam 40. After the energy-absorbing beam 40 reaches the deformation limit, the kinetic energy and impact energy will be transferred to the second side beam 12 along the first longitudinal beam 20.

[0071] In some embodiments, please combine Figure 3 , Figure 4 and Figure 5 As shown, the cross-section of the energy-absorbing beam 40 includes two first walls 41 arranged at relative intervals along the second direction Y and two second walls 42 arranged at relative intervals along the third direction Z. The first walls 41 and the second walls 42 together enclose a directional collapse space 400. One of the first walls 41 abuts against the second longitudinal beam 30, and the other first wall 41 abuts against the limiting crossbeam 14. The second wall 42 includes a first bent portion 421 extending inward toward the energy-absorbing beam 40 and a second bent portion 422 extending outward toward the energy-absorbing beam 40, so as to form an angled shape 401 that is recessed inward toward the energy-absorbing beam 40.

[0072] It should be noted that, Figure 5 This embodiment illustrates a specific cross-sectional structure of the energy-absorbing beam 40, which undergoes directional collapse to absorb energy. The energy-absorbing beam 40 is formed by a first bend 421 and a second bend 422, creating an angled shape 401 that is recessed into the interior of the energy-absorbing beam 40. During the application of an external impact, the first bend 421 and the second bend 422 are recessed into the interior of the energy-absorbing beam 40, collapsing and absorbing energy in a predetermined direction to prevent the energy-absorbing beam 40 from deforming toward the battery pack cover and to avoid unpredictable deformation of the battery pack during a collision.

[0073] In some embodiments, see Figure 5 As shown, the first bending portion 421 is connected to the first wall 41, and the first bending portion 421 and the first wall 41 are set at a first preset deformation angle β1, where β1 satisfies 70°≤β1≤80°; the second bending portion 422 is disposed on the side of the first bending portion 421 away from the first wall 41, and the second bending portion 422 and the first wall 41 are set at a second preset deformation angle β2, where β2 satisfies 30°≤β2≤45°.

[0074] In this embodiment, the energy-absorbing beam 40 is designed with a first preset deformation angle β1 and a second preset deformation angle β2, such that β1 satisfies 70°≤β1≤80° and β2 satisfies 30°≤β2≤45°. This ensures that the energy-absorbing beam 40 can collapse and absorb energy along a preset direction during external impact, preventing the energy-absorbing beam 40 from deforming toward the battery pack cover and avoiding unpredictable deformation of the battery pack during collision. This further improves safety and ensures the safety of the electrical area 102 and the cell area 101.

[0075] Preferably, the first preset deformation angle β1 can be 75° and the second preset deformation angle β2 can be 43°.

[0076] It should be noted that the specific structural form, length, width, wall thickness, structural strength, and energy absorption efficiency of the energy-absorbing beam 40 can be adjusted according to the actual project requirements, and are not limited to the situations described in the above embodiments.

[0077] In some embodiments, the compressive yield strength of the first longitudinal beam 20 is σ1, the overall compressive yield strength of the second longitudinal beam 30 is σ2, the compressive yield strength of the limiting crossbeam 14 is σ3, and the compressive yield strength of the energy-absorbing beam 40 is σ4, where σ1≥σ2≥σ3≥σ4.

[0078] And / or, where σ1-σ2≥30MPa, σ2-σ3≥30MPa, σ3-σ4≥30MPa;

[0079] And / or, please see Figure 5 As shown, the wall thickness of the energy-absorbing beam 40 is H4, which satisfies 1mm≤H4≤2.5mm; the dimension of the energy-absorbing beam 40 along the second direction Y is W, which satisfies ≥25mm.

[0080] In this embodiment, when the battery pack is subjected to a tail impact, since σ1, σ2, σ3 and σ4 satisfy σ1≥σ2≥σ3≥σ4, and / or, where σ1-σ2≥30MPa, σ2-σ3≥30MPa, σ3-σ4≥30MPa, the main kinetic energy and impact energy are absorbed by the energy-absorbing beam 40. Only when the energy-absorbing beam 40 reaches its deformation limit will the remaining kinetic energy and impact energy affect the first longitudinal beam 20 and the second longitudinal beam 30, effectively reducing the intrusion risk of the cell area 101 and the electrical area 102 and improving the safety of the battery pack. The wall thickness H4 of the energy-absorbing beam 40 satisfies 1mm≤H4≤2.5mm, and the dimension W of the energy-absorbing beam 40 along the second direction Y satisfies ≥25mm, thereby ensuring that the energy-absorbing beam 40 has sufficient total energy absorption and collapsing deformation space, and ensuring that the main kinetic energy and impact energy are absorbed by the energy-absorbing beam 40, effectively reducing the intrusion risk of the cell area 101 and the electrical area 102.

[0081] Furthermore, the material of the first longitudinal beam 20 can be 6061-T6 aluminum alloy or 6063-T5 aluminum alloy. The tensile strength of the first longitudinal beam 20 ranges from 160MPa to 240MPa, the yield strength of the first longitudinal beam 20 ranges from 110MPa to 180MPa, and the elongation of the first longitudinal beam 20 ranges from 8% to 12%.

[0082] Furthermore, the material of the second longitudinal beam 30 can be 6061-T6 aluminum alloy or 6063-T5 aluminum alloy. The tensile strength of the second longitudinal beam 30 ranges from 160MPa to 240MPa, the yield strength of the second longitudinal beam 30 ranges from 110MPa to 180MPa, and the elongation of the second longitudinal beam 30 ranges from 8% to 12%.

[0083] Furthermore, the material of the energy-absorbing beam 40 can be 3-series aluminum alloy, the tensile strength of the energy-absorbing beam 40 is in the range of 120MPa to 160MPa, the yield strength of the energy-absorbing beam 40 is in the range of 50MPa to 100MPa, and the elongation of the energy-absorbing beam 40 is greater than or equal to 20%.

[0084] It should be noted that if the wall thickness of the energy-absorbing beam 40 is too thin, it cannot guarantee a sufficient total energy absorption, resulting in insufficient overall structural strength and deformation resistance of the electrical region 102, making it difficult to resist large external impacts. Therefore, the wall thickness H4 of the energy-absorbing beam 40 must satisfy H4≥1mm. If the wall thickness of the energy-absorbing beam 40 is too thick, it is easy for the overall structural strength of the energy-absorbing beam 40 to be higher than that of the first longitudinal beam 20 and / or the second longitudinal beam 30, causing the directional collapse effect of the energy-absorbing beam 40 to fail, increasing the risk of intrusion into the cell region 101 and the electrical region 102. Therefore, the wall thickness H4 of the energy-absorbing beam 40 must also satisfy H4≤2.5mm. When the wall thickness of the energy-absorbing beam 40 is constant, if the dimension of the energy-absorbing beam 40 along the second direction Y is too small, it is easy for the collapse deformation space of the energy-absorbing beam 40 to be insufficient. Therefore, the dimension W of the energy-absorbing beam 40 along the second direction Y must satisfy W≥25mm.

[0085] With this setting, the preset deformation of the energy-absorbing beam 40 can reach 20mm. When the battery pack is subjected to external impact, if the intrusion part of the battery pack box after being blocked by the first side beam 11 is set to be less than or equal to 20mm, the intrusion into the cell area 101 and the electrical area 102 can be avoided.

[0086] Preferably, the wall thickness H4 of the energy-absorbing beam 40 can be 2mm.

[0087] In some embodiments, see Figure 7 As shown, the cross-section of the first longitudinal beam 20 includes a first frame portion 21 and a plurality of second frame portions 22 arranged circumferentially around the first frame portion 21. The second frame portions 22 are centrally symmetrically arranged relative to the first frame portion 21 at least in the first direction X and the third direction Z.

[0088] In this embodiment, the first longitudinal beam 20 adopts a highly centrally symmetrical structure, which is beneficial to enhance the torsional resistance of the first longitudinal beam 20 and reduce the twisting degree of the first longitudinal beam 20 during extrusion.

[0089] In some embodiments, see Figure 7 As shown, the dimension of the first longitudinal beam 20 along the first direction X is L1, and the dimension of the first longitudinal beam 20 along the third direction Z is L2, where L1 = L2;

[0090] And / or, please see Figure 7 As shown, a transition fillet R is formed between two adjacent second frame parts 22 in the cross section of the first longitudinal beam 20, and R satisfies 5mm≤R≤10mm.

[0091] In this embodiment, the first longitudinal beam 20 adopts a structure with a high central symmetry, and the dimension of the first longitudinal beam 20 along the first direction X is equal to the dimension of the first longitudinal beam 20 along the third direction Z, thereby enhancing the torsional resistance of the first longitudinal beam 20 and reducing the twisting degree of the first longitudinal beam 20 during extrusion; the transition radius R of the first longitudinal beam 20 satisfies 5mm≤R≤10mm, thereby improving the overall structural strength of the first longitudinal beam 20, ensuring the torsional resistance of the first longitudinal beam 20, and reducing the twisting degree of the first longitudinal beam 20 during extrusion.

[0092] Furthermore, the second frame portion 22 and the first frame portion 21 can be integrally formed.

[0093] In some embodiments, please combine Figure 8 and Figure 9 As shown, the first side beam 11 has several connector interfaces 111 on one side of the limiting crossbeam 14 along the second direction Y, and the several connector interfaces 111 are spaced apart along the first direction X.

[0094] The second longitudinal beam 30 extends along the second direction Y, and its end near the first side beam 11 is offset from the connector interface 111; please refer to Figure 10 As shown, the distance between the second longitudinal beam 30 and the connector interface 111 along the first direction X is P, and P satisfies 20mm≤P≤30mm.

[0095] In this embodiment, each second longitudinal beam 30 is staggered from the connector interface 111. The distance P between the second longitudinal beam 30 and the connector interface 111 along the first direction X satisfies 20mm≤P≤30mm, thereby allowing the second longitudinal beam 30 to avoid the connector interface 111. This ensures that the second longitudinal beam 30 abuts against the wall of the first side beam 11, guaranteeing the overall structural strength and deformation resistance of the electrical area 102. It also ensures that the electrical area 102 can withstand high-intensity impacts during external impacts, thus ensuring the safety of the electrical area 102.

[0096] In some embodiments, the wall thickness of the first longitudinal beam 20 is H1, where H1 satisfies H1≥H3, and see [reference needed]. Figure 14 As shown, H3 is the wall thickness of the third side beam 13; please refer to [link / reference]. Figure 10 As shown, the wall thickness of the second longitudinal beam 30 is H2, and H2 satisfies H2≥H3. Please refer to [link / reference needed]. Figure 14 As shown, H3 is the wall thickness of the third side beam 13;

[0097] The dimension of the second longitudinal beam 30 along the first direction X is Q, and Q satisfies Q≥25mm.

[0098] In this embodiment, the wall thickness H1 of the first longitudinal beam 20 is satisfied by H1≥H3, thereby improving the overall structural strength of the first longitudinal beam 20, ensuring the torsional resistance of the first longitudinal beam 20, and reducing the twisting degree of the first longitudinal beam 20 during extrusion; the wall thickness H2 of the second longitudinal beam 30 is satisfied by H2≥H3, where H3 is the wall thickness of the third side beam 13, and the dimension of the second longitudinal beam 30 along the first direction X is satisfied by Q≥25mm, thereby enhancing the structural strength of the second longitudinal beam 30, ensuring the overall structural strength and deformation resistance of the electrical area 102.

[0099] Furthermore, the value range of H3 can be 2mm≤H3≤2.5mm; the value range of H1 can be 2.5mm≤H1≤3mm; and the value range of H2 can be 2.5mm≤H2≤3mm.

[0100] According to an embodiment of the present invention, another aspect provides a battery pack, including: a battery cell 50, and a battery pack housing as described above;

[0101] Please see Figure 11 As shown, battery cells 50 are disposed on both sides of the first longitudinal beam 20 in the first direction X; several battery cells 50 are stacked along the second direction Y; please combine them together. Figure 12 and Figure 13 As shown, an explosion-proof valve 51 is provided on the side of the battery cell 50 facing the first longitudinal beam 20 along the first direction X.

[0102] The distance between the battery cell 50 and the first longitudinal beam 20 along the first direction X is M, and M satisfies 30mm≤M≤50mm.

[0103] It should be noted that if the distance between the battery cell 50 and the first longitudinal beam 20 along the first direction X is too small, it will easily reduce the exhaust space of the explosion-proof valve 51, causing the battery cell 50 to be unable to exhaust gas in time under thermal runaway conditions, affecting the safety of the battery pack. Therefore, the distance M between the battery cell 50 and the first longitudinal beam 20 along the first direction X must satisfy M≥30mm. If the distance between the battery cell 50 and the first longitudinal beam 20 along the first direction X is too large, it will easily reduce the energy density of the battery pack. Therefore, the distance M between the battery cell 50 and the first longitudinal beam 20 along the first direction X must also satisfy M≤50mm.

[0104] The battery pack provided by this utility model reduces the risk of intrusion into the cell area 101 and the electrical area 102 by adopting the above-mentioned battery pack housing, thereby improving the safety of the battery pack.

[0105] In this embodiment, the distance M between the battery cell 50 and the first longitudinal beam 20 along the first direction X satisfies 30mm≤M≤50mm, which can ensure that the explosion-proof valve 51 has sufficient venting space, improve the safety of the battery pack, and also ensure the energy density of the battery pack.

[0106] Further, please see Figure 11 As shown, the battery cell 50 can be a blade battery, preferably a half-blade battery (also known as a short blade battery or short knife battery, usually with a length dimension of less than 600mm, and several battery cells 50 are stacked along the second direction Y to form a stacked core).

[0107] Furthermore, the stacked core, the limiting crossbeam 14, and the second side beam 12 are all provided with buffer foam (not shown in the figure), thereby further improving the safety of the cell area 101.

[0108] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack housing having a three-dimensional shape with intersecting first (X), second (Y), and third (Z) directions, characterized in that, The battery pack housing includes: A base plate (10), a first side beam (11) and a second side beam (12) extending along the first direction (X) and spaced apart, and a third side beam (13) extending along the second direction (Y); wherein, the first side beam (11) is disposed on one side of the base plate (10) in the second direction (Y), the second side beam (12) is disposed on the other side of the base plate (10) in the second direction (Y), and the third side beam (13) is spaced apart on both sides of the base plate (10) in the first direction (X), and the base plate (10), the first side beam (11), the second side beam (12) and the third side beam (13) together enclose an installation space (100); A limiting beam (14) extends along a first direction (X) and is built into the installation space (100), the limiting beam (14) dividing the installation space (100) into a cell area (101) and an electrical area (102); The first longitudinal beam (20) is built into the cell area (101). The first longitudinal beam (20) extends along the second direction (Y) and is supported between the second side beam (12) and the limiting crossbeam (14). The second longitudinal beam (30) is built into the electrical area (102). The second longitudinal beam (30) extends along the second direction (Y) and is supported between the first side beam (11) and the limiting crossbeam (14).

2. The battery pack housing according to claim 1, characterized in that, The battery pack housing also includes an energy-absorbing beam (40), which is disposed between the second longitudinal beam (30) and the limiting crossbeam (14). The cross section of the energy-absorbing beam (40) is circumferentially closed, and the shape of the cross section is configured to include an angle shape (401) that is recessed into the energy-absorbing beam (40) in the third direction (Z).

3. The battery pack housing according to claim 2, characterized in that, The cross-section of the energy-absorbing beam (40) includes a first wall (41) spaced apart along a second direction (Y) and a second wall (42) spaced apart along a third direction (Z); wherein the second wall (42) includes a first bend (421) extending inward toward the interior of the energy-absorbing beam (40) and a second bend (422) extending outward toward the exterior of the energy-absorbing beam (40) to form an angled shape (401) that is recessed into the interior of the energy-absorbing beam (40).

4. The battery pack housing according to claim 3, characterized in that, The first bending portion (421) is connected to the first wall body (41), and the first bending portion (421) and the first wall body (41) are set at a first preset deformation angle β1, where β1 satisfies 70°≤β1≤80°; the second bending portion (422) is located on the side of the first bending portion (421) away from the first wall body (41), and the second bending portion (422) and the first wall body (41) are set at a second preset deformation angle β2, where β2 satisfies 30°≤β2≤45°.

5. The battery pack housing according to claim 2, characterized in that, The compressive yield strength of the first longitudinal beam (20) is σ1, the overall compressive yield strength of the second longitudinal beam (30) is σ2, the compressive yield strength of the limiting crossbeam (14) is σ3, and the compressive yield strength of the energy-absorbing beam (40) is σ4, σ1≥σ2≥σ3≥σ4; And / or, where σ1-σ2≥30MPa, σ2-σ3≥30MPa, σ3-σ4≥30MPa; And / or, the wall thickness of the energy-absorbing beam (40) is H4, where H4 satisfies 1mm≤H4≤2.5mm; the dimension of the energy-absorbing beam (40) along the second direction (Y) is W, where W satisfies ≥25mm.

6. The battery pack housing according to any one of claims 1-5, characterized in that, The cross-section of the first longitudinal beam (20) includes a first frame portion (21) and a plurality of second frame portions (22) arranged circumferentially on the first frame portion (21). The second frame portions (22) are centrally symmetrically arranged relative to the first frame portion (21) at least in the first direction (X) and the third direction (Z).

7. The battery pack housing according to claim 6, characterized in that, The dimension of the first longitudinal beam (20) along the first direction (X) in the cross section is L1, and the dimension of the first longitudinal beam (20) along the third direction (Z) in the cross section is L2, L1 = L2; And / or, a transition fillet R is formed between two adjacent second frame portions (22) in the cross section of the first longitudinal beam (20), wherein R satisfies 5mm≤R≤10mm.

8. The battery pack housing according to any one of claims 1-5, characterized in that, The first side beam (11) has a plurality of connector interfaces (111) on one side facing the limiting crossbeam (14) along the second direction (Y), and the plurality of connector interfaces (111) are spaced apart along the first direction (X); The second longitudinal beam (30) extends along the second direction (Y) and is positioned at one end near the first side beam (11) in a staggered manner from the connector interface (111); the distance between the second longitudinal beam (30) and the connector interface (111) along the first direction (X) is P, where P satisfies 20mm≤P≤30mm.

9. The battery pack housing according to claim 8, characterized in that, The wall thickness of the first longitudinal beam (20) is H1, and H1 satisfies H1≥H3; the wall thickness of the second longitudinal beam (30) is H2, and H2 satisfies H2≥H3, where H3 is the wall thickness of the third side beam (13); The second longitudinal beam (30) has a dimension of Q along the first direction (X), where Q satisfies Q≥25mm.

10. A battery pack, characterized in that, include: Battery cell (50), and battery pack housing as described in any one of claims 1 to 9 above; The length of the battery cell (50) is less than 600mm. The battery cell (50) is disposed on both sides of the first longitudinal beam (20) in the first direction (X). A plurality of the battery cells (50) are stacked along the second direction (Y). An explosion-proof valve (51) is disposed on the side of the battery cell (50) facing the first longitudinal beam (20) in the first direction (X). The distance between the battery cell (50) and the first longitudinal beam (20) along the first direction (X) is M, where M satisfies 30mm≤M≤50mm.

Images